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    • 专利摘要:
    organic light emitting diode display unit, method of actuation thereof and display device. The present invention relates to an organic light emitting diode display unit, a method of actuating the same and a display device. at least a portion of pixel units (11) are pixel units (11) each with a stacked structure; each pixel unit (11) with the stacked structure includes two adjacent groups of stacked subpixel units (110); and each stacked subpixel unit group (110) includes at least two subpixel units (111) that have different emission colors and are stacked and isolated from each other. during the display of different image frames, each stacked subpixel unit group (110) in each pixel unit (11) with the stacked structure can display the grayscale effect of at least two colors based on the applied signals. Compared to an approach that each subpixel unit can only display single-color grayscale effect for different image frames, the display effect can be improved.
    公开号:BR112015032775B1
    申请号:R112015032775-3
    申请日:2015-01-16
    公开日:2021-08-17
    发明作者:Shengji Yang；Xue DONG；Hailin XUE；Haisheng Wang；Yiming Zhao；Xiao Sun；Peng Liu；Hongjuan Liu；Yingming Liu
    申请人:Beijing Boe Optoelectronics Technology Co., Ltd.；Boe Technology Group Co., Ltd.；
    IPC主号:
    专利说明:

    Technical Field
    [001] At least one embodiment of the present invention relates to an organic light emitting diode (OLED) display unit, a method of driving the same and a display device. Background
    [002] An OLED display unit is one of the relevant points in the current research domain of flat-panel display devices. Compared with liquid crystal display devices (LCD), the OLED display unit has the advantages of low power consumption, low production cost, self-luminescence, wide viewing angle, and fast response speed, etc. . Currently, the OLED display unit has started to replace LCD devices in the flat panel display field, such as cell phones, personal digital assistants (PDAs) and digital cameras.
    [003] The OLED display unit mainly includes: a base substrate and pixel units formed on the base substrate and arranged in an array. The pixel unit includes a plurality of subpixel units arranged on the same layer and pixel circuits which are respectively connected to the subpixel units in a one-to-one correspondence. A subpixel unit includes an OLED frame. summary
    [004] Embodiments of the present invention provide an OLED display unit, a method of driving the same and a display device, which are used to improve the pixel display effect of the OLED display unit.
    [005] At least one embodiment of the present invention provides an OLED display unit. The OLED display unit includes a base substrate and a plurality of pixel units disposed on the base substrate. The plurality of pixel units includes a plurality of subpixel units and pixel circuits, which are respectively connected to the subpixel units in a one-to-one correspondence. Subpixel units are OLED structures, and pixel circuits in the same pixel unit are respectively connected to different data signal lines. At least a portion of the pixel units are pixel units each with a stacked structure, wherein each of the pixel units with the stacked structure includes two adjacent groups of stacked subpixel units. Each stacked subpixel unit group includes at least two subpixel units that have different output colors and are stacked and isolated from each other, and a number of subpixel units in each stacked subpixel unit group of a same pixel unit with the stacked structure is identical. In each pixel unit with the stacked structure, two subpixel units arranged on the same layer form a subpixel unit layer; and in a same pixel unit with the stacked structure, only one subpixel unit layer includes two subpixel units that have the same output colors, and other subpixel unit layers, each including two subpixel units that have different emission colors.
    [006] At least one embodiment of the present invention further provides a method for driving the OLED display unit. The method comprises: receiving image video signals; and controlling, based on corresponding colors of an image at corresponding positions of the pixel units in the OLED display unit, the subpixel units that display light of the corresponding colors and which are in pixel units at the corresponding positions to display , where the image corresponds to a video signal of a current image frame.
    [007] The OLED display unit further includes: all pixel units with the stacked structure are evenly arranged; in each pixel unit with the stacked structure, two groups of stacked subpixel units are adjacent to each other along a row direction; the array positions of the odd rows of the pixel units with the stacked structure correspond to each other, and the array positions of the even rows of the pixel units with the stacked structure correspond to each other; and in two adjacent rows of pixel units with the stacked structure, two groups of stacked subpixel units that are adjacent to each other in position and have the same structure are misaligned. At least one embodiment of the present invention further provides a method for driving the OLED display unit, which includes: during the display of an odd picture frame, controlling a subpixel unit layer in each odd row of pixel units with the stacked structure for emitting the light, and during the display of an even picture frame, controlling another subpixel unit layer in each odd row of pixel units with the stacked structure for emitting the light; and during the odd picture frame display, control one subpixel unit layer in each even row of pixel units with the structure stacked to emit light, and during the even picture frame display, control another subpixel unit layer. subpixel in each even row of pixel units with the structure stacked to emit light. In addition, during the display of each image frame, the subpixel units that emit light and are in the odd rows of pixel units with the stacked structure and the subpixel units that emit light and are in the even rows of pixel units with the stacked structure are in different layers.
    [008] The OLED display unit further includes: all pixel units with the stacked structure are evenly arranged; in each pixel unit with the stacked structure, two groups of stacked subpixel units are adjacent to each other along the column direction; the odd column array positions of pixel units with the stacked structure correspond to each other, and the even column array positions of pixel units with the stacked structure correspond to each other; and in two adjacent columns of pixel units with the stacked structure, two groups of stacked subpixel units that are adjacent to each other in position and have the same structure are misaligned. At least one embodiment of the present description further provides a method for driving the OLED display unit, which includes: during the display of an odd picture frame, controlling a subpixel unit layer in each odd column of pixel units with the stacked structure to emit light, and during the display of an even picture frame, control another subpixel unit layer in each odd column of pixel units with the stacked structure to emit light, and during the display of the subpixel frame odd image, control one subpixel unit layer in each even column of pixel units with the structure stacked to emit light, and during the display of the even image frame, control another subpixel unit layer in each even column of units pixel with the structure stacked to emit light. In addition, during the display of each image frame, the subpixel units that emit light and are in the odd columns of pixel units with the stacked structure and the subpixel units that emit light and are in the even columns of pixel units with the structure are stacked in different layers.
    [009] At least one embodiment of the present invention further provides a display device, which includes the OLED display unit provided by the embodiments of the present description. Brief Description of Drawings
    [0010] A simple description will be given below to the attached drawings of embodiments to provide a clearer understanding of the technical proposals for embodiments of the present invention. Obviously, the drawings described below involve only some embodiments of the present invention, but are not intended to limit the present description.
    [0011] Figure 1 is a schematic structural view of an OLED structure;
    [0012] Figure 2 is a schematic structural view of an OLED display unit provided by the embodiments of the present description;
    [0013] Figure 3 is a schematic structural view of a pixel unit with a stacked structure provided by the embodiments of the present description;
    [0014] figures 4a to 4f are, respectively, schematic structural views of a pixel unit with a stacked structure provided by the embodiments of the present description;
    [0015] Figure 5 is a schematic structural view of an OLED structure provided by the embodiments of the present description;
    [0016] figures 6a and 6b are, respectively, schematic structural views of an OLED display unit provided by the embodiments of the present description;
    [0017] Figure 7a is a schematic structural view of an OLED display unit provided by the embodiments of the present description;
    [0018] figure 7b is a schematic diagram of the OLED display unit as shown in figure 7a in the case of reaching the virtual display;
    [0019] Figure 8a is a schematic structural view of an OLED display unit provided by the embodiment of the present invention;
    [0020] figure 8b is a schematic diagram of the OLED display unit as shown in figure 8a, in the case of reaching the virtual display;
    [0021] Figure 9 is a specific circuit diagram of a pixel circuit provided by the embodiments of the present description;
    [0022] Figure 10 is a circuit timing diagram of the pixel circuit as shown in Figure 9;
    [0023] Figure 11 is a flowchart of a method of driving the OLED display unit, provided by the embodiments of the present description;
    [0024] Figure 12 is a flowchart of a method of driving the OLED display unit as shown in Figure 7a; and
    [0025] Figure 13 is a flowchart of a method of driving the OLED display unit as shown in Figure 8a. Detailed Description
    [0026] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms "first", "second", etc., which are used in the description and claims of the present specification, are not intended to indicate any sequence, quantity or importance, but distinguish various components. Furthermore, terms such as "the", "a", etc., are not intended to limit the quantity, but indicate the existence of at least one. The terms "comprises", "comprises", "includes", "which includes", etc., are intended to specify that the elements or objects indicated before these terms encompass the elements or objects and their equivalents listed after these terms, but do not exclude other elements or objects. The expressions "connects", "connected", etc. are not intended to define a physical connection or mechanical connection, but may include an electrical connection, directly or indirectly. "Over", "under", "right", "left", and the like are only used to indicate relative position relationship, and when the position of the object that is described is changed, the relative position relationship can be changed in conformity.
    [0027] For a clearer understanding of the objectives, technical proposals and advantages of the embodiments of the present invention, the clear and complete description will be given below to the technical proposals of the embodiments of the present invention with reference to the attached drawings of the embodiments of the present description. Obviously, preferred embodiments are only partial embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art effortlessly on the basis of the illustrated embodiments of the present invention will fall within the scope of protection of the present description.
    [0028] The shapes and sizes of layers in the attached drawings do not reflect the actual scale of the OLED display unit and only reflect a partial structure of the OLED display unit. The purpose is only to illustrate the content of this description.
    [0029] Figure 1 is a structural view of a schematic structure of OLED. As illustrated in Figure 1, the OLED structure 1 includes, in general, an anode 01 and a cathode 02 arranged opposite each other, and a light-emitting layer 03 disposed between the anode 01 and the cathode 02. The emission of light by the OLED display unit is achieved by the following means: a pixel circuit 2 applies a voltage between anode 01 and cathode 02; holes in anode 01 and electrons in cathode 02 are recombined in light-emitting layer 03 to produce excitons; excitons are migrated under the action of electric fields to transfer energy to the luminescent molecules in the light emitting layer 03 and excite the electrons in the luminescent molecules to transition from the ground state to the animated state; and the energy of the animate state undergoes the radiative transition to produce the photons.
    [0030] Unlike the case where an LCD uses a stable voltage to control brightness, the OLED is driven by a current and needs a stable current to control light emission. Due to technological process, device aging and other reasons, the threshold voltage Vth of a drive transistor in a 2T1C pixel circuit (two thin-film transistors (TFTs) or metal oxide semiconductor tubes (MOS) and one capacitor) has irregularities, so the current flowing through the OLED of each pixel may change and therefore the screen brightness may be uneven. Therefore, the effect of the entire display image may be affected and therefore the brightness of different areas of the OLED display unit may be uneven.
    [0031] Currently, in order to compensate for the irregularity of the threshold voltage of the drive transistor in the pixel circuit, the number of TFTs and the number of capacitors in the pixel circuit are high, and the threshold voltage offset of the drive transistor in the pixel circuit is compensated by the mutual cooperation of TFTs and capacitors. However, due to the increase in the number of TFTs and the increase in the number of capacitors in the pixel circuit, a reduction in pixel size can be quite limited and therefore the pixel exposure effect can be affected.
    [0032] Therefore, in the case with a large amount of TFTs in the current OLED display unit's pixel circuit, how to improve the pixel display effect has become the focus of attention of several manufacturers.
    [0033] At least one embodiment of the present invention provides an OLED display unit which, as illustrated in Figure 2, comprises a base substrate 10 and a plurality of pixel units 11 disposed on the base substrate 10. Each unit of pixel 11 includes a plurality of subpixel units 111 and pixel circuits 112 which are respectively connected to subpixel units 111 in one-to-one correspondence. Subpixel units 111 have OLED structures, and pixel circuits 112 in the same pixel unit 11 are respectively connected to different data lines. At least a portion of the pixel units 11 are pixel units 11, each with a stacked structure, and each pixel unit 11 with the stacked structure includes two adjacent groups of stacked subpixel units 110. Each group of stacked subpixel units 110 includes at least two subpixel units 111 that have different output colors and are stacked and isolated from each other, and the number of subpixel units 111 of each group of subpixel units 110 stacked in the same pixel unit 11 with the structure stacked is the same. In the pixel unit 11 with the stacked structure, two subpixel units 111 arranged on the same layer are considered as one subpixel unit layer. In a same pixel unit 11 with the stacked structure, only the one subpixel layer unit includes two subpixel units 111 that have the same luminescent color, and one or more other subpixel unit layers, each including two subpixel units 111 that have different output colors.
    [0034] In the OLED display unit provided by the embodiments of the present description, at least a portion of the pixel units are pixel units with a stacked structure, and each pixel unit with the stacked structure includes two adjacent groups of subpixel units stacked, each group of stacked subpixel units includes at least two subpixel units that have different output colors and are stacked and isolated from one another; and the number of subpixel units of each group of subpixel units stacked in the same pixel unit with the stacked structure is the same. Therefore, during the display of different image frames, each group of subpixel units stacked in each pixel unit with the stacked structure can display the grayscale effect of at least two colors according to the applied signals. Compared with the case where each subpixel unit can only display the grayscale effect of one color for different image frames, the OLED display unit can improve the display effect, because each group of stacked subpixel units can display more colors.
    [0035] Furthermore, for a same pixel unit with the structure stacked from the pixel units with the structure stacked, only one subpixel unit layer includes two corresponding subpixel units that have the same luminescent color, and the other subpixel unit layer includes two corresponding subpixel units that have different output colors. Therefore, a virtual display pixel arrangement effect can also be obtained by controlling the light emission of subpixel units in different layers during display.
    [0036] In at least one embodiment, in order to be able to independently control the subpixel units in the same pixel unit with the stacked structure, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figure 3, subpixel units 111 in the same pixel unit 11 with the stacked structure are respectively connected to corresponding pixel circuits 112 through corresponding selection switches 113. Selection switches 113 are configured to receive the signals, respectively. corresponding control switches which are used to control the switching on or off of the selection switches 113.
    [0037] For example, as illustrated in Figure 3, a pixel unit 11 with the stacked structure includes four subpixel units 111. A first subpixel unit for red light emission (R-OLED) is connected to a first circuit of pixel 112 through a select switch 113; the first pixel circuit 112 is connected to a corresponding data line (represented as "data" in Figure 3); a corresponding control signal G1 controls to turn the selection switch 113 on or off. A second subpixel unit for red light emission (R-OLED) is connected to a second pixel circuit 112 by means of a selection switch 113; the second pixel circuit 112 is connected to a corresponding data line, a corresponding control signal G2 controls to turn the selection switch 113 on or off. An OLED structure for emitting the green light (G-OLED) is connected to a third pixel circuit 112 via a select switch 113; the third pixel circuit 112 is connected to a corresponding data line; a corresponding control signal G3 controls to turn the selection switch 113 on or off. An OLED structure for the emission of blue light (B-OLED) is connected to a quarter pixel circuit 112 by means of a selection switch 113 ; the fourth pixel circuit 112 is connected to a corresponding data line; and a corresponding control signal G4 controls to turn the selection switch 113 on or off. Thus, when displaying each picture frame, within a same pixel unit with the stacked structure, each selection switch connected to a respective subpixel unit for the display of a corresponding color can be selected to be turned on based on the actual color of the current picture frame, so that the subpixel units to display the corresponding colors in the pixel unit with the stacked structure can be triggered to output the light. Furthermore, because pixel circuits associated with different subpixel units are connected to different data lines, different data signals can be applied to different pixel circuits according to the current picture frame and therefore an arbitrary display can be achieved. Therefore, a same pixel unit with the stacked structure can display the grayscale display effect of different colors according to the difference of each image frame. Compared with the case where each subpixel unit can only display the grayscale display effect of one color, the OLED display unit described above can improve the display effect, because each pixel unit with the stacked structure can display more color grayscale display effect. Particularly for the OLED display unit wherein each pixel unit with the stacked structure at least includes subpixel units to emit red light, subpixel units to emit green light and pixel units to emit light blue, the perfect display effect can be achieved. Perfect display effect refers to the fact that pixel units can display the display effect of any gray scale of red, green and blue (RGB), so the display effect can be poorly enhanced - great.
    [0038] In at least one embodiment, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figure 3, the selection switches 113 are switching transistors; the gate electrodes of the switching transistors are connected to the control signals (G1, G2, G3 and G4 in the figure) to control switching transistors on or off, respectively; the drain electrodes of the switching transistors are connected to corresponding subpixel units 111, respectively; and the source electrodes of the switching transistors are connected to corresponding pixel circuits 112, respectively. As illustrated in Figure 3, the first subpixel unit for emitting red light (R-OLED) is connected to the first pixel circuit 112 by means of a switching transistor M1, and a gate electrode of the switching transistor M1 is connected to the G1 control signal; the second subpixel unit for emitting red light (R-OLED) is connected to the second pixel circuit 112 by means of a switching transistor M2, and a gate electrode of the switching transistor M2 is connected to the control signal G2; the OLED structure for emitting green light (G-OLED) is connected to the third pixel circuit 112 via a switching transistor M3, and a gate electrode of the switching transistor M3 is connected to the control signal G3; and the blue light emitting OLED structure (B-OLED) is connected to the fourth pixel circuit 112 by means of a switching transistor M4, and a gate electrode of the switching transistor M4 is connected to the control signal G4 .
    [0039] It should be noted that: in the OLED display unit provided by the embodiments of the present description, when the number of subpixel units in each pixel unit with the stacked structure is larger, the display effect is better. However, a greater amount of subpixel units indicates that an OLED display unit thickness is greater. Thus, in the concrete application, the number of subpixel units in each pixel unit with the stacked structure can be determined by a balance between display effect and display unit thickness.
    [0040] In the OLED display unit provided by the embodiments of the present description, the number of subpixel units in each pixel unit with the stacked structure can be equal or it can also be unequal. No limitations will be imposed here.
    [0041] For example, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figures 4a to 4f, each group of stacked subpixel units 110 in each pixel unit 11 with the stacked structure includes two subpixel units 111, and the output colors of the four subpixel units 111 in the respective pixel unit 11 with the stacked structure are, respectively, red (R), blue (B), green (G) and red (R), or red ( R), blue (B), green (G) and blue (B), or red (R), blue (B), green (G) and green (G).
    [0042] In at least one embodiment, in order to simplify the manufacturing process, in the OLED display unit provided by the embodiments of the present description, the emission color sequence of the four subpixel units in each pixel unit with the structure stacked is the same. That is, the pixel units, each with a stacked structure, have the same structure.
    [0043] In at least one embodiment, in order to achieve a perfect full-screen display effect, all pixel units in the OLED display unit provided by the embodiments of the present description are pixel units each with the stacked structure .
    [0044] In a specific application, in the OLED display unit provided by the embodiments of the present description, as illustrated in figures 4a to 4f, the OLED structure generally includes an anode 011, a light emitting layer 012 and a 013 cathode, which are stacked in sequence. The anode is generally produced from indium tin oxide (ITO) materials. The cathode is, in general, produced from transparent metallic materials.
    [0045] For example, in the OLED structure, as illustrated in Figure 5 from the OLED display unit provided by the embodiments of the present description, the light emitting layer 012 can include layers produced from different organic materials, by example, an orifice injection layer (LIS) 0121, an orifice transport layer (HTL) 0122, an organic light emitting layer 0123, an electron transport layer (ETL) 0124, and an electronic injection layer (EIL) ) 0125. Orifice injection layer 0121 is close to anode 011 and away from cathode 013. Electron injection layer 0125 is close to cathode 013 and away from anode 011. As some other features of OLED structure belong to the technique known to those skilled in the art, no further description will be given here.
    [0046] In at least one embodiment, in order to simplify the structure, in the OLED display unit provided by the embodiments of the present description, an electrical potential of a cathode in each OLED structure of the same pixel unit with the stacked structure is equal . That is, each OLED structure in the same pixel unit with a stacked structure shares the cathode signal input terminal, so the number of cathode signal input terminals for signal input to cathodes in the cathode unit OLED display can be reduced. Of course, in a specific application, the electrical potentials of the cathodes in the OLED structures of the same pixel unit with the stacked structure can also be unequal. That is, the OLED structures are electrically connected to different cathode signal input terminals, respectively. No limitations will be imposed here.
    [0047] In the OLED display unit provided by the embodiments of the present description, an electrical potential of a cathode of an OLED structure may be a negative voltage or it may be zero. No limitations will be imposed here.
    [0048] In at least one embodiment, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figures 6a and 6b, all pixel units 11 are pixel units, each with the stacked structure; all pixel units 11, each with the stacked structure, are arranged in a matrix; and in each pixel unit 11 with the stacked structure, two groups of stacked subpixel units 110 are adjacent to each other along a row direction or a column direction.
    [0049] Or in at least one embodiment, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figure 7a, all pixel units 11 are pixel units 11, each with the stacked structure; all pixel units 11, each with the stacked structure, are evenly arranged; in each pixel unit 11 with the stacked structure, two groups of stacked subpixel units 110 are adjacent to each other along the row direction; the array positions of odd rows of pixel units 11, each with the stacked structure, correspond to each other, and the array positions of even rows of pixel units 11, each with the stacked structure, correspond to each other. ; and in two adjacent rows of pixel units 11, each with the stacked structure, two groups of stacked subpixel units 110, which are adjacent to each other in position and have the same structure, are misaligned.
    [0050] For example, in the OLED display unit, as shown in figure 7a, not only the perfect display effect can be achieved, but also the RGB virtual display pixel layout mode can be achieved by controlling different switches of selection to be linked. For example, when displaying using the OLED display unit, as shown in Figure 7A, selection switches connected to a first layer of subpixel units 111 that are in odd rows of pixel units 11 with the stacked structure are bonded, wherein the first layer of subpixel units 111 is a layer proximate to a base substrate 10; and selection switches connected to a second layer of subpixel units 111 that are in the odd rows of pixel units 11 with the stacked structure are turned off, wherein the second layer of subpixel units 111 is a layer distant from the substrate of base 10. Meanwhile, selection switches connected to a first layer of subpixel units 111, which are in the even rows of pixel units 11 with the stacked structure, are turned off, wherein the first layer of subpixel units is a layer close to base substrate 10; and selection switches connected to a second layer of subpixel units 111, which are in the even rows of pixel units 11 with the stacked structure, and are turned on, wherein the second layer of subpixel units 111 is a layer away from the substrate. of base 10. The specific effect is shown in figure 7b. Each group of stacked subpixel units 110 can achieve the virtual display by adopting the periodic pixel color borrowing means known to those skilled in the art.
    [0051] Or in at least one embodiment, in the OLED display unit provided by the embodiments of the present description, as illustrated in Figure 8a, all pixel units 11 are pixel units 11, each with the stacked structure; all pixel units 11 with the stacked structure are evenly arranged; in each pixel unit 11 with the stacked structure, two groups of stacked subpixel units 110 are adjacent to each other along the column direction; the odd column array positions of pixel units each with the stacked structure correspond to each other, and the even column array positions of pixel units each with the stacked structure correspond to each other; and in two adjacent columns of pixel units 11 with the stacked structure, two groups of stacked subpixel units 110 that are adjacent to each other in position and have the same structure are offset.
    [0052] For example, in the OLED display unit, as shown in figure 8a, not only the perfect display effect can be achieved, but also the RGB virtual display pixel display mode can be achieved by controlling different switches of selection to be linked. For example, when using the OLED display unit as shown in figure 8-A, the selection switches connected to a first layer of subpixel units 111, which are in odd columns of pixel units 111 with the stacked structure, are turned off, wherein the first layer of subpixel units 111 is a layer close to the base substrate 10 and the selection switches connected to a second layer of subpixel units 111, which are in the odd columns of pixel units 11 with the stacked structure, are connected, wherein the second layer of subpixel units 111 is a layer distant from the base substrate 10. Meanwhile, selection switches connected to a first layer of subpixel units 111, which are in columns pairs of pixel units 11 with the stacked structure are connected, wherein the first layer of subpixel units is a layer close to the base substrate 10, and selection switches connected to a second. of the layer of subpixel units 111, which are situated in the even columns of pixel units 11 with the stacked structure, are disconnected, wherein the second layer of subpixel units 111 is a layer distant from the base substrate 10. specific effect is shown in figure 8b. Each group of stacked subpixel units 110 can achieve the virtual display by adopting the periodic pixel color borrowing means known to those skilled in the art.
    [0053] For example, in the OLED display unit provided by the embodiments of the present description, the pixel circuits have an effective compensation function and can effectively compensate for the irregularity and deviation of the threshold voltage of the drive transistors in the driving circuits. pixel, as well as the current difference caused by the irregularity of OLEDs. There are many types of pixel circuits with in-field compensation function. No limitations will be imposed here.
    [0054] The OLED display unit provided by the embodiments of the present description will be described below with reference to a pixel circuit with a compensation function. For example, as illustrated in Figure 9, pixel circuit 112 may include: a drive transistor T0, a first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a fourth switching transistor T4 , a fifth switching transistor T5 and a capacitor C1. As for the first switching transistor T1, a source electrode is connected to a reference voltage terminal; a drain electrode is connected to a T0 trigger transistor gate electrode; and a gate electrode is configured to receive a first EM control signal. As for the second switching transistor T2, a gate electrode is configured to receive a first scan signal Vscan1; a drain electrode is connected to a T0 drive transistor source electrode; and a source electrode is configured to receive a data voltage signal Vdata. As for the third switching transistor T3, a gate electrode is configured to receive a second sweep signal Vscan2; a source electrode is connected to a T0 drive transistor drain electrode; and a drain electrode is connected to a corresponding subpixel unit 111. As for the fourth switching transistor T4, a source electrode is connected to the gate electrode of the trigger transistor T0; a drain electrode is connected to the drain electrode of the T0 drive transistor; and a gate electrode is configured to receive the first scan signal Vscan1. As for the fifth switching transistor T5, a gate electrode is configured to receive the second scan signal Vscan2; a source electrode is connected to the power voltage Vdd; and a drain electrode is connected to the source electrode of the T0 drive transistor. Capacitor C1 is connected between the reference voltage terminal and the gate electrode of the T0 drive transistor.
    [0055] For example, in a specific application, in the OLED display unit provided by the embodiments of this description, transistors are transistors, in general, produced from the same materials. For example, in a specific application, all transistors are either P-type transistors or N-type transistors. N-type transistors are turned off under the action of a low voltage level and turned on under the action of a high voltage level. P-type transistors are turned off under the action of a high voltage level and turned on under the action of a low voltage level.
    [0056] It should be noted that the switching transistors and the drive transistor referred to in the previous embodiments of the present description can be TFTs and can also be metal oxide semiconductor field effect transistors (MOSFET). No limitations will be imposed here. In a specific application, the functions of source electrodes and transistor drain electrodes can be interleaved according to different types of transistors and different input signals. No specific distinctions will be given here.
    [0057] A subpixel unit display method of the OLED display unit provided by the embodiments of the present description will be described below considering the pixel circuit as shown in figure 9 as an example. For example, in Figure 9, all driving transistors and all switching transistors are P-type transistors; a connection point between the drain electrode of the first switching transistor and the gate electrode of the driving transistor is considered as a first node A; and a connection point between the capacitor and the reference voltage terminal is considered as a second node B. A sequence control timing is shown in figure 10, and a display process of each display picture frame includes three stages T1 to T3. Suppose the control signal G1 controls the selection switch M1 to be turned on when displaying the current picture frame, so that a subpixel unit for red light emission (R-OLED) is driven to display and emit light . A specific display process is as follows.
    [0058] In phase T1, Vscan1, Vscan2 and G1 are at a high voltage level, and EM is at a low voltage level. At this point, switching transistor T1 is turned on, and T2, T3, T4, T5 and M1 are turned off; loads stored in the first node A are released through T1; a T0 trigger transistor gate electrode voltage signal is reset; and the T0 drive transistor is turned on.
    [0059] In phase T2, Vscan1 and G1 are at a low voltage level, and Vscan2 and EM are at a high voltage level; switching transistors T2, T4 and M1 are turned on and T1, T3 and T5 are turned off; and trigger transistor T0 continues to maintain the on state. Because T4 is in an on state, the gate electrode and the drain electrode of the T0 Trigger Transistor are linked together; and the first node A is carried by the data signal Vdata through the drive transistor T0, so that the voltage of the first node A can be increased until the voltage of the first node A is Vdata—Vth. At this point, the amount of electrical charges Q of capacitor C1 is as follows:
    where V1 refers to the voltage of the first node A at this point and is equal to Vdata—Vth; and V2 refers to the supply voltage of the second node B at that point and is equal to the reference voltage terminal voltage VREF. In the present description, the reference voltage terminal is grounded, so the voltage VREF is 0.
    [0060] In phase T3, Vscan2 and G1 are at a low voltage level and scan1 and EM are at a high voltage level. Thus, switching transistors T3, T5 and M1 are turned on and T1, T2 and T4 are turned off; capacitor C1 holds the voltage of the gate electrode of the trigger transistor T0 to be still Vdata-Vth; and the voltage of the T0 drive transistor electrode source is the power voltage Vdd. In order to ensure that the transistor T0 drive is in the on state, at that stage, when designed, the power voltage Vdd is less than the data signal voltage Vdados and drives B-OLED to emit light,

    [0061] The gate source voltage Vgs of the TO drive transistor is held to be Vdd + Vth - V data. At this point, the current of the T0 drive transistor is as follows:
    .
    [0062] As is known from the above formula, the drive transistor current T0 is only relevant for the power voltage Vdd and the data voltage Vdata and irrelevant for the threshold voltage Vth. Therefore, the influence of the unevenness and the deviation of the threshold voltage of the drive transistor and the unevenness of the electrical properties of the OLED structures can be eliminated and therefore the display effect can be even more guaranteed.
    [0063] The above modalities are just described, considering the pixel circuit as shown in figure 9 as an example. The operating principle of the process of displaying all subpixel units in the embodiments of the present description is the same as the description above. No further description will be given here.
    [0064] Based on the same concept of the invention, at least one embodiment of the present invention further provides a method for driving the OLED display unit described above. As illustrated in Figure 11, the method may comprise the following steps: S101 which includes receiving picture video signals; and S102, which includes controlling, based on the colors of a corresponding image at corresponding positions of the pixel units in the OLED display unit, which subpixel units display light of the corresponding colors and which are in the pixel units at the corresponding positions for display, where the image corresponds to a video signal of a current image frame.
    [0065] In the top drive method, each subpixel unit group stacked in each pixel unit with the stacked structure is controlled to display light of at least two colors according to the video signals of a plurality of frames of Image. That is to say, in the process for displaying a plurality of image frames, the on or off state of each subpixel unit in each group of stacked subpixel units can be controlled so that each group of stacked subpixel units can display the light of at least two colors (that is, display the effect in grayscale of at least two colors).
    [0066] In the method for driving the OLED display unit provided by the embodiments of the present description, the subpixel units for the color light display in the corresponding pixel units at the corresponding positions can be controlled to display based on the color of an image with the positions of the pixel units in the OLED display unit, where the image corresponds to a video signal of the current image frame. As part of the pixel units in the OLED display unit are pixel units with the structure stacked, each group of subpixel units stacked in each pixel unit with the structure stacked can display the gray scale of a plurality of colors. Thus, compared to the case where a subpixel unit can only display the grayscale effect of one color, a group of stacked subpixel units can be used to replace the subpixel unit that can only display the effect in scale. of gray one color. Thus, the number of colors presented by each group of stacked subpixel units is increased compared to the subpixel unit which can only display the gray scale effect of one color and therefore the display effect can be improved.
    [0067] Based on the same concept of the invention, correspondingly, for a structure that is the OLED display unit, as shown in Figure 7a, at least one embodiment of the present invention further provides a drive method. That is, in the OLED display unit, all pixel units 11 are pixel units 11, each with stacked structure, and all pixel units 11, each with stacked structure, are arranged evenly in each. pixel unit 11 with the stacked structure, two groups of stacked subpixel units 110 are adjacent to each other along the row direction; the array positions of odd rows of pixel units 11 with the stacked structure correspond to each other, and the array positions of even rows of pixel units 11 with the stacked structure correspond to each other; and in two adjacent rows of pixel units 11 with the stacked structure, two groups of stacked subpixel units 110 that are adjacent to each other in position and have the same structure are offset. As illustrated in figure 12, the drive method comprises the following steps S201 and S202. The steps will be described below, one by one.
    [0068] S201: during the display of an odd picture frame, controlling a subpixel unit layer in each odd row of pixel units with the structure stacked to emit light; and during the display of an even picture frame, controlling another subpixel unit layer in each odd row of pixel units with the stacked structure to emit light.
    [0069] S202: during odd picture frame display, controlling a subpixel unit layer in each even row of pixel units with the structure stacked to emit light; and during the display of the even picture frame, controlling another subpixel unit layer in each even row of pixel units with the structure stacked to emit light. In addition, during the display of each image frame, the subpixel units that emit light and are in the odd rows of pixel units with the stacked structure and the subpixel units that emit light and are in the even row of pixel units with the stacked structure are on different layers.
    [0070] For example, during the display of an odd picture frame: a layer of subpixel units that is in even rows of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in odd rows is a layer close to a base substrate; and a layer of subpixel units that is in the even rows of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the even rows is a layer away from the base substrate. During display of an even picture frame: a layer of subpixel units that is in the odd row of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in the odd rows is a far layer of the base substrate; and a layer of subpixel units that is in the even rows of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the even rows is a layer close to the base substrate. Or, when displaying an odd picture frame: a layer of subpixel units that is in even rows of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in even rows is a layer close to the base substrate; and a layer of subpixel units that are in odd rows of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the odd rows is a layer away from the base substrate. During display of an even picture frame: a layer of subpixel units that is in the even rows of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in the even rows is a layer away from the base substrate; and a layer of subpixel units that is in the odd rows of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the odd rows is a layer close to the base substrate.
    [0071] As such, for two adjacent image frames, different subpixel units are adopted to achieve the virtual display pixel array effect. Also, as the subpixel units only display for a duration time of one image frame for the two image frames, the lifetime of the OLED unit can be extended based on getting the virtual display.
    [0072] Correspondingly, for a structure that is the OLED display unit, as shown in Figure 8 one, at least one embodiment of the present invention further provides a method of driving. That is, in the OLED display unit, all pixel units 11 are pixel units 11 each with stacked structure, and all pixel units 11, each with stacked structure, are arranged evenly; in each pixel unit 11 with the stacked structure, two groups of stacked subpixel units 110 are adjacent to each other along the column direction; the odd column array positions of pixel units 11 with the stacked structure correspond to each other, and an even column array position of pixel units 11 with the stacked structure correspond to each other; and in two adjacent columns of pixel units 11 with the stacked structure, two groups of stacked subpixel units 110 that are adjacent to each other in position and have the same structure are offset. As illustrated in figure 13, the drive method comprises steps S301 and S302. The steps will be described below, one by one.
    [0073] S301: during the display of an odd picture frame, controlling a subpixel unit layer in each odd column of pixel units with the structure stacked to emit light; and during the display of an even picture frame, controlling another subpixel unit layer in each odd column of pixel units with the stacked structure to emit light.
    [0074] S302: during odd picture frame display, controlling a subpixel unit layer in each even column of pixel units with the stacked structure to emit light; and during the display of the even picture frame, controlling another subpixel unit layer in each even column of pixel units with the structure stacked to emit light. In addition, during the display of each image frame, the subpixel units that emit light and are in odd columns of pixel units with the structure stacked and the subpixel units that emit light and are in the even columns of pixel units pixel with stacked structure are in different layers.
    [0075] For example, during the display of an odd picture frame: a layer of subpixel units that is in odd columns of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in odd columns it is a layer close to a base substrate; and a layer of subpixel units that are in even columns of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the even columns is a layer away from the base substrate. During display of an even picture frame: a layer of subpixel units that is in the odd columns of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in the odd columns is a layer away from the base substrate; and a layer of subpixel units which is situated in the even columns of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the even columns is a layer close to the base substrate. Or, when displaying an odd picture frame: a layer of subpixel units that is in even columns of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in even columns is a layer close to the base substrate; and a layer of subpixel units that is in odd columns of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the odd columns is a layer away from the base substrate. During the display of an even picture frame: a layer of subpixel units that is situated in the even columns of pixel units with the stacked structure is controlled to emit light, where the layer of subpixel units in even columns is a layer away from the base substrate; and a layer of subpixel units that are in the odd columns of pixel units with the stacked structure is controlled to emit light, wherein the layer of subpixel units in the odd columns is a layer close to the base substrate.
    [0076] As such, for two adjacent image frames, different subpixel units are adopted to achieve the virtual display pixel array effect. Also, as subpixel units only display at a time duration of one image frame to two image frames, the lifetime of the OLED display unit can be extended based on getting the virtual display.
    [0077] Based on the same concept of the invention, at least one embodiment of the present invention further provides a display device, comprising any OLED display unit said above provided by the embodiments of the present description. The display device can include: any product or component with a display function, such as a mobile phone, tablet PC, television, monitor, notebook, digital photo frame and browser, etc. All other necessary components of the display device should be understood by those skilled in the art, should not be further described herein, and should not be construed as a limitation of the present invention. Display device modalities may refer to previous OLED display unit modalities. No further description will be given here.
    [0078] In the OLED display unit, the drive method thereof and the display device provided by the embodiments of the present description, at least a part of pixel units is pixel units each with a stacked structure; each pixel unit with the stacked structure includes two adjacent groups of stacked subpixel units; each group of stacked subpixel units includes at least two subpixel units that have different output colors and are stacked and isolated from one another; and the number of subpixel units in each of the stacked subpixel unit groups of the same pixel unit with the stacked structure is the same. Therefore, during the display of different image frames, each group of subpixel units stacked in each pixel unit with the stacked structure can display the grayscale effect of at least two colors according to the applied signals. Compared with the case that each subpixel unit can only display the grayscale effect of one color for different picture frames, the OLED display unit described above can improve the display effect, because each group of stacked subpixel units can display more colors. Furthermore, in each same pixel unit with the stacked structure of the pixel units each with the stacked structure, a single layer of a subpixel unit includes two subpixel units that have the same broadcast color, and one or other of the subpixel unit layers include two subpixel units that have different output colors. Therefore, during display, the virtual display pixel arrangement effect can also be achieved by controlling the light emission of subpixel units in different layers.
    [0079] The foregoing is only one of the preferred embodiments of the present description and is not intended to limit the scope of protection of the present description. The scope of protection of the present invention must be defined by the appended claims.
    [0080] The application claims priority to Chinese patent application number 201410515749.X, filed September 29, 2014, the description of which is incorporated herein by reference in its entirety as part of the application.
    权利要求:
    Claims (15)
    [0001]
    1. Organic light emitting diode (OLED) display unit comprising a base substrate (10) and a plurality of pixel units (11) disposed on the base substrate (10), the plurality of pixel units (11) including a plurality of subpixel units (111) and pixel circuits (112) which are respectively connected to the subpixel units (111) in a one-to-one correspondence, wherein: the subpixel units (111) comprise OLED structures and circuitry. pixel (112) in a same pixel unit (11) are respectively connected with different data signal lines; at least part of the pixel units (11) are pixel units, each with a stacked structure, and each of the pixel units (11) with the stacked structure includes two stacked groups of adjacent subpixel units (110); each stacked subpixel unit group (110) includes at least two subpixel units (111) that have different emitter colors and are stacked and isolated from each other, and a number of subpixel units (111) in each subpixel unit group. stacked subpixel (110) of a same pixel unit (11) with the stacked structure is identical; in each pixel unit (11) with the stacked structure, two subpixel units (111) arranged in the same layer form a subpixel unit layer; and in a same pixel unit (11) with the stacked structure, only one subpixel unit layer includes two subpixel units (111) with the same emitted colors and one or more subpixel unit layers includes two subpixel units ( 111) having different emitter colors, wherein all pixel units (11) are pixel units, each with the stacked structure, wherein all the pixel units (11) with the stacked structure are arranged in a matrix; and in each pixel unit (11) with the stacked structure, two subpixel unit stacked groups (110) are adjacent to each other along a row or column direction, characterized by: all pixel units (11 ) with the stacked structure are arranged regularly; in each pixel unit (11) with the stacked structure, two subpixel unit stacked groups (110) are adjacent to each other along a line direction; the array positions of the odd rows of pixel units (11) with the stacked structure correspond to each other and the array positions of the even lines of pixel units (11) with the stacked structure correspond to each other; and in two adjacent rows of pixel units (11) with the stacked structure, two stacked groups of subpixel units (110) that are adjacent to each other in position and have the same structure are offset.
    [0002]
    2. OLED display unit according to claim 1, characterized in that the subpixel units (111) in a same pixel unit (11) with the stacked structure are respectively connected to the corresponding pixel circuits (112) through the corresponding ones. selector switches (113); and the selector switches (113) are configured to respectively receive the corresponding control signals which are used to control the activation or deactivation of the selector switches (113).
    [0003]
    OLED display unit according to any one of claims 1 to 2, characterized in that in each pixel unit (11) with the stacked structure, each stacked group of subpixel unit (110) includes two subpixel units ( 111); and emitting colors of four subpixel units (111) in each pixel unit (11) with the stacked structure are respectively red (R), blue (B), green (G) and red (R) or R, B, G and B, or R, B, G and G.
    [0004]
    OLED display unit according to claim 3, characterized in that a sequence of the colors emitted from the four subpixel units (111) in each pixel unit (11) with the stacked structure is identical.
    [0005]
    5. OLED display unit according to any one of claims 1 to 4, characterized in that: each of the OLED structures includes an anode (011), a light emitting layer (012) and a cathode (013) which are stacked in sequence; and the electrical potentials of the cathodes (013) in the corresponding OLED structures of the same pixel unit (11) with the stacked structure are equal or unequal.
    [0006]
    6. OLED display unit according to claim 2, characterized in that each of the selector switches (113) is a switching transistor; a switching transistor gate electrode (113) is configured to receive a corresponding control signal; a switching transistor source electrode (113) is connected with a corresponding pixel circuit (112); and a switching transistor drain electrode (113) is connected to a corresponding subpixel unit (111).
    [0007]
    7. Organic light-emitting diode (OLED) display unit, comprising a base substrate (10) and a plurality of pixel units (11), positioned on the base substrate (10), the plurality of pixel units ( 11), which includes a plurality of subpixel units (111) and pixel circuits (112) that are respectively connected with the subpixel units (111) in a one-to-one correspondence, wherein: the subpixel units (111) comprise OLED structures and pixel circuits (112) in a same pixel unit (11) are respectively connected with different data signal lines; at least part of the pixel units (11) are pixel units, each with a stacked structure, and each of the pixel units (11) with the stacked structure includes two stacked groups of adjacent subpixel units (110); each stacked subpixel unit group (110) includes at least two subpixel units (111) that have different emitter colors and are stacked and isolated from each other, and a number of subpixel units (111) in each subpixel unit group. stacked subpixel (110) of a same pixel unit (11) with the stacked structure is identical; in each pixel unit (11) with the stacked structure, two subpixel units (111) arranged in the same layer form a subpixel unit layer; and in a same pixel unit (11) with the stacked structure, only one subpixel unit layer includes two subpixel units (111) with the same emitted colors and one or more subpixel unit layers includes two subpixel units ( 111) having different emitter colors, wherein all pixel units (11) are pixel units, each with the stacked structure, wherein all the pixel units (11) with the stacked structure are arranged in a matrix; and in each pixel unit (11) with the stacked structure, two subpixel unit stacked groups (110) are adjacent to each other along a row or column direction, characterized by: all pixel units (11 ) with the stacked structure are arranged regularly; in each pixel unit (11) with the stacked structure, two subpixel unit stacked groups (110) are adjacent to each other along one column direction; the arrangement positions of the odd columns of pixel units (11) with the stacked structure correspond to each other, and the arrangement positions of the even columns of the pixel units (11) with the stacked structure correspond to each other; and in two adjacent columns of pixel units (11) with the stacked structure, two stacked groups of subpixel units (110) that are adjacent to each other in position and have the same structure are misaligned.
    [0008]
    8. OLED display unit according to claim 7, characterized in that the subpixel units (111) in a same pixel unit (11) with the stacked structure are respectively connected to the corresponding pixel circuits (112) via switches corresponding selectors (113); and the selector switches (113) are configured to respectively receive the corresponding control signals which are used to control the activation or deactivation of the selector switches (113).
    [0009]
    An OLED display unit according to any one of claims 7 to 8, characterized in that: each of the OLED structures includes an anode (011), a light-emitting layer (012) and a cathode (013) which are stacked in sequence; and the electrical potentials of the cathodes (013) in the corresponding OLED structures of the same pixel unit (11) with the stacked structure are equal or unequal.
    [0010]
    An OLED display unit according to claim 8, characterized in that each of the selector switches (113) is a switching transistor (113); a switching transistor gate electrode (113) is configured to receive a corresponding control signal; a switching transistor source electrode (113) is connected with a corresponding pixel circuit (112); and a switching transistor drain electrode (113) is connected to a corresponding subpixel unit (111).
    [0011]
    11. Method for activating the OLED display unit, according to any one of claims 1 to 10, characterized in that it comprises: receiving image video signals; and controlling, based on the corresponding colors of an image at the corresponding positions of the pixel units (11) in the OLED display unit, subpixel units (111) which display light of the corresponding colors and which are in the pixel units (11) in the corresponding positions to be displayed, where the image corresponds to a video signal of a current image frame.
    [0012]
    12. Conducting method according to claim 11, characterized in that each stacked group of subpixel unit (110) in each pixel unit (11) with the stacked structure is controlled to display light of at least two colors based on video signals from a plurality of image frames.
    [0013]
    13. Method for driving the OLED display unit, according to claim 1, characterized in that it comprises: during the display of an odd image frame, controlling a subpixel unit layer in each odd row of pixel units ( 11) with the structure stacked to emit light and during display of an odd image frame, controlling another subpixel unit layer in each odd row of pixel units (11) with the structure stacked to emit light; and during the display of the odd picture frame, controlling a subpixel unit layer in each even row of pixel units (11) with the structure stacked to emit light and during the display of the even picture frame, controlling another unit layer of subpixel in each even row of pixel units (11) with the stacked structure to emit light, wherein during display of each image frame, subpixel units (111) that emit light and are in odd rows of pixel units with the stacked structure and subpixel units (111) that emit light and are in the even rows of pixel units (11) with the stacked structure are in different layers.
    [0014]
    14. Method for driving the OLED display unit according to claim 7, characterized in that it comprises: during the display of an odd picture frame, controlling a subpixel unit layer in each odd column of pixel units ( 11) with the structure stacked to emit light and during display of an odd picture frame, controlling another subpixel unit layer in each odd column of pixel units (11) with the structure stacked to emit light; and during the display of the odd picture frame, controlling a subpixel unit layer in each even column of pixel units (11) with the structure stacked to emit light and during the display of the even picture frame, controlling another unit layer of subpixel units in each even column of pixel units (11) with the stacked structure for emitting light, wherein during the display of each image frame, the subpixel units (111) that emit light and are in the odd columns of the light units. pixel (11) with the stacked structure and the subpixel units (111) that emit light and are in the even columns of the pixel units (11) with the stacked structure are in different layers.
    [0015]
    15. Display device, characterized in that it comprises the OLED display unit according to any one of claims 1 to 10.
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    法律状态:
    2020-04-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-20| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    2021-08-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/01/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201410515749.X|2014-09-29|
    CN201410515749.XA|CN104269431B|2014-09-29|2014-09-29|A kind of organic elctroluminescent device, its driving method and display device|
    PCT/CN2015/070894|WO2016050015A1|2014-09-29|2015-01-16|Organic electroluminescent display device and driving method therefor, and display apparatus|
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