• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A display device (100) comprising a display unit (105) having an image display surface (110), a cutoff unit (120) movable between a release position and a cutoff position of the a light beam (125) falling on the image display surface (110). A temperature capture unit (130) captures the temperature of the display surface (110) by non-contact detection and / or by using the structures (115) of the display unit (105). A controller (135) operates the cutoff unit (120) in accordance with the temperature of the display surface (110).
    公开号:FR3024580A1
    申请号:FR1557036
    申请日:2015-07-24
    公开日:2016-02-05
    发明作者:Martin Edel；Kai Schickner；Bernhard Herzog
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0001] Field of the Invention The present invention relates to a display device, a field of view display system, a method for managing such a display device and a device for the implementation of a display device. of this method and a computer program for executing the method. STATE OF THE ART In general, in the case of head-up display systems (also called HUD display system or displays on the windshield), there is the difficulty of focusing on the image source. when the sun comes directly following the path of the main beam in the head-up display system. In particular, in the case of liquid crystal displays as an image source, it is possible to locally exceed the permitted temperature.
    [0002] A known method for reducing incident radiation when the head-up display is not used (storage position) is to close a mechanical shutter fitted to the head-up display. This shutter can be opaque to the incident radiation to mechanically cut the external incident radiation.
    [0003] DE 10 2011 105 689 A1 discloses a head-up display system equipped with a sensor system for determining the intensity of incident radiation and a shutter to protect the head-up display from incident radiation. DE 103 53 156 B4 discloses a head-up display shutter which makes it possible to modify the size of the opening of the control panel as a function of the image to be represented. DESCRIPTION AND ADVANTAGES OF THE INVENTION The subject of the present invention is a display device comprising a display unit provided with an image display surface, a switching unit movable between a release position and a positioning position. cutoff to cut the path of the light beam falling on the image display surface into the cut-off position and release this path in the release position, a temperature-sensing unit for capturing the temperature of the display surface; image by non-contact detection and / or by using the structures of the display unit for displaying the image and a control apparatus for operating the cut-off unit as a function of the temperature of the surface of the image image display between the cut-off position and the release position. The display unit is, in general, a display that reproduces an image. This may be for example a flat screen, in particular a controlled liquid crystal display (TFT display, that is to say a thin-film transistor display). The image display surface may be the active surface of the display unit. The active area may correspond to the maximum dimension of the image to display. The path of the light beam is the geometric path of the path through the display.
    [0004] Radiation is optical radiation, especially solar radiation. According to the invention, the cutting unit is a flat element made of an opaque material such as a diaphragm or a rectangular or circular screen or a shutter. For example, the cutoff unit may be in the form of a movable closure unit between a cutoff position for example, a closed position and a release position, for example an open position. The cutoff unit can also be in the form of a flap or lamellar diaphragm. Alternatively, the cutoff unit may also be a mirror tilting between the cutoff position and the release position. The temperature sensing unit is an electronic component for capturing thermal radiation from the image display surface without being in contact with that surface. The temperature sensing unit may also be a pyrometer (pyroelectric detector), or a radiation thermometer. The input unit for the temperature can also be a thermopile detector, a bolometer or a quantum detector for measuring the surface temperature. According to a development, the breaking unit is in the form of a shutter. One can thus use for example a known shutter. According to another development, the cutoff unit is a tilting mirror and one can for example use the mirror one that is already used to direct the path of the light beam. Alternatively or additionally, the temperature input unit may enter the temperature of the image display surface using the structures for displaying the image of that unit. These structures are for example electrically conductive structures, such as semiconductors of the display unit, especially in the area of the image display surface. The temperature acquisition unit makes it possible to determine the temperature of the image display surface in the form of a voltage or a voltage evolution of the structures of this surface. The control apparatus is an electrical apparatus processing the sensor signals to provide control signals and / or data signals. The control apparatus has an interface in circuit and / or program form. In the case of an embodiment in the form of circuit, the interface is for example part of an ASIC system which already has different functions of the control device. But it is also possible to make the interface in the form of an integrated circuit or at least a circuit formed partially of discrete components. In the case of a program realization, the interfaces are program modules that are on a microcontroller next to other program modules.
    [0005] The invention is based on the consideration that it is possible to capture the temperature of the image display surface of a display unit without using a contact and to control a cutoff unit to protect the display surface image against incident radiation using the temperature entered.
    [0006] As with a critical heating of a liquid crystal cell, a shutter is actuated as the breaking unit and thus the incident radiation is reduced to prevent the liquid crystal display from being thermally damaged by the incident solar radiation. For example, it is possible to use the capture of the temperature of the liquid crystal cells to close the shutter precisely when the sun actually produces a critical heating of the liquid crystal cells, which avoids damaging the polarizing filter or dazzling the lenses. liquid crystal, thus avoiding irreversible loss of contrast or the disappearance of the displayed image.
    [0007] Non-contacting temperature capture further has the advantage that the temperature sensing unit may be at a distance from the image display surface so that the temperature sensing unit does not project. shadow on the image display surface. This prevents the temperature input unit from disturbing the displayed image. In addition, this allows a very homogeneous temperature capture over as large an area as possible of the image display surface, with the result that the accuracy and reliability of the temperature capture can be improved. The invention can be used in addition to or instead of static countermeasures against excessive temperatures applied to a liquid crystal display relying for example on the use of a reflective polarizing filter as a cover plate of the display head-up or transmission polarization filter inside the head-up display system optics. In addition, a cold-light mirror can be provided in the optical system of the head-up display, which reflects the infrared radiation and allows the transmission of visible light. It is also possible to combine the cold-light mirror and the polarized filter. While the effect of incident radiation for conventional head-up displays with a virtual image of for example 6 ° in width and 2.5 ° in height at a projection distance of 2.4 m, that is the distance between the virtual image and the box of the field of view can be generally treated by the means described, the incident energies in the case of a head-up display system with a much larger virtual image or a much larger projection distance can also be higher. In addition, in the case of a large projection distance, the radiation will be more strongly focused so that the intensity of the radiation, that is to say the irradiation will be increased locally. A display device according to the invention makes it possible to process the intensity of the radiation even for large projection distances or large virtual images. According to a development of the invention, the temperature sensing unit captures at least a first temperature of a first partial area of the image display surface and a second temperature of a second partial area of the image area. image display surface, the control device actuating the cutoff unit according to the first temperature and / or the second temperature. This may be for example for the first partial area of the marginal area of the image display surface and for the second partial area of the central area of the image display surface. By entering the temperature of these respective zones, it is possible to detect an irregular heating of the image display surface. Advantageously, the controller combines the first temperature and the second temperature to obtain a combined value. The controller then operates the cutoff unit using this combined value. The combined value is for example an average value or a maximum value of the first and second temperatures. The combined value allows a very precise capture of the temperature of the display surface and thus a reliable control of the breaking unit. A temperature capture with a particularly high local resolution is made if the temperature acquisition unit makes it possible to capture at least one other temperature of another partial area of the image display surface and the control apparatus actuating then the unit of cutoff according to this other temperature. The temperature acquisition unit can for example subdivide the image display surface in the form of a grid into a multiplicity of partial zones of the same dimension constituting temperature measurement fields and then separately measure the temperature of these different temperature ranges. The control apparatus is suitably constructed to separately exploit the different temperatures. According to one feature, the capture unit occupies the entire image display surface to have the temperature of that surface, which makes it possible to capture the temperature even taking into account the marginal range of the display surface. image. The temperature input unit also captures the temperature of the surface of the display unit which includes at least the image display surface. The control unit then activates the cut-off unit according to the temperature of the surface. Thus, to actuate the cutoff unit it will also be possible to enter, for example, the temperature of the frame surrounding the image display surface.
    [0008] According to another development, the temperature acquisition unit inputs the temperature of the cutoff unit into the cutoff position and the control device actuates the cutoff unit further according to its temperature in the cutoff position. . The temperature of the cut-off unit makes it possible to determine the extent to which the display device is exposed to the incident radiation after closing the cut-off unit. According to another characteristic, the display device comprises at least one optical element thermally coupled to the display unit and at least one other temperature sensing unit is provided. This other temperature sensing unit detects the temperature of the optical element and the control device actuates the optical element according to the temperature of the optical element. The optical element may be an element made of a transparent material, for example a glass lens or a glass plate. The optical element may be remote from the display unit and be connected for example by thermoconductive paths or a heat-conducting glue with the display unit. This embodiment has the advantage that to capture the temperature of the optical element can be used a contact thermometer, economic as another temperature sensing unit.
    [0009] The display device comprises a housing with at least one opening in the path of the light beam. The display unit is housed in the housing so that the image display surface is facing the opening of the housing. The cutoff unit equips the opening of the housing to opaquely close the latter in the cutoff position or release it in the release position. The cutoff unit is for example fixed to the housing by means of a hinge and thus functions as a closing flap or releasing the opening of the housing. The cutoff unit is thus integrated into the display device in a cost-effective and simple way to achieve.
    [0010] As a variant of such a cutoff unit, it is also possible to stop the incident solar radiation arriving on the display by mechanically moving the mirror of the head-up display system (by tilting it for example around a horizontal axis). so that the sun does not arrive directly on the display. The control of the mirror is in the case of solar radiation similarly to the control of a shutter. The display unit is advantageously constituted by a liquid crystal display so that the display device is light and compact.
    [0011] The invention creates a vision field display system for a vehicle that includes a display as described above. The field of view display system is for example a head-up display system. The invention also relates to a method of managing a display device comprising a display unit, a cutoff unit that can switch between a release position and a cutoff position to cut the path of the light beam towards the image display surface in the off position or release this path in the release position and a temperature sensing unit to input the temperature of the image display surface by a touchless input and or by using the structures of the display unit for displaying the image, characterized in that it comprises the following steps of recording a temperature signal provided by a contactless detection by the input unit of temperature and / or by using the temperature of the image display surface captured with the structures used for image display and provide an actuation signal using the signal of The invention also relates to a device for carrying out the steps of the method as described above. This device makes it possible to carry out the process quickly, simply and efficiently.
    [0012] The device for carrying out the method is an electrical apparatus which processes the signals of the sensors and generates control signals and / or data signals according to these sensor signals. The device includes an interface in circuit and / or program form. In the case of an embodiment in the form of a circuit, the interface is for example part of an ASIC system which already provides various functions of the device. The interface may also be an integrated circuit, clean or at least part of a circuit formed of discrete components. In the case of an embodiment in the form of a program, the interface is for example a program module which is located on a microcontroller next to other program modules. The subject of the invention is also a computer program product or, more simply, a computer program comprising a program code recorded on a machine-readable medium such as a semiconductor memory, a hard disk or an optical memory. to execute or apply the program or to control the steps of the program as described above when the program product or more simply the program are executed on a computer or such device.
    [0013] Drawings The present invention will be described in more detail below with the aid of examples of display devices shown in the accompanying drawings in which: FIG. 1 is a diagram of an exemplary embodiment of an arrangement FIG. 2 is a diagram of the activated field of view display system according to an exemplary embodiment of the invention, FIG. 3 is a diagram of a field display system. 4a, 4b are diagrams of a display device with an optical element according to an exemplary embodiment of the invention, FIG. 5 is a diagram of an embodiment of the invention. a vehicle equipped with a field of view display system according to an exemplary embodiment of the invention, FIG. 6 is a diagram of an image display surface comprising a temperature measurement frame according to an example embodiment of the invention, the fi FIG. 7 is a simplified flowchart of the management method of a display device according to an exemplary embodiment of the invention, FIG. 8 is a block diagram of a device for implementing a management method. a display device according to an exemplary embodiment of the invention and Figure 9 is a schematic representation of a control apparatus according to an exemplary embodiment of the invention. DESCRIPTION OF EMBODIMENTS FIG. 1 schematically shows a display device 100 according to an exemplary embodiment of the present invention. The display device 100 includes a display unit 105 with an image display surface 110 for displaying an image. The display unit 105 includes structures 115 for displaying the image on the image display surface 110. The structures 115 are, for example, thin film transistors or similar electronic components, distributed along the display surface 110. The display device 100 also has a cutoff unit 120 set between an open position and a cutoff position. In FIG. 1, the breaking unit 120 is represented by way of example as a shutter; the turning point of the cut-off unit 120 is close to the outer edge of the image display surface 110. In the cut-off position, the path of the beam 125 arriving on the image display surface 110 for example, a sun ray is stopped by the cut-off unit 120 so that the image display surface 110 is protected against this radiation. The cutoff unit 120 is for example made to opaquely cover the entire image display surface 110 in the cutoff position. In FIG. 1, the cut-off unit 120 is shown in the open position in which the path of the beam 125 is free so that the beam reaches the display surface 110. The display device 100 has a unit temperature sensor 130 which is at a distance from the display surface 110 and allows the temperature of the display surface 110 to be entered without contact. Alternatively or additionally, the temperature input unit 130 is electrically connected to the structures 115 to use one of the electrical potentials applied to the structures 115 to determine the temperature of the display surface 110. The temperature sensing unit 130 is connected to a control apparatus 135. The The control apparatus 135 is connected to the cutoff unit 120 to operate it in accordance with the temperature of the image display surface 110 between its cutoff position and its open position. The display device 100 may in particular be a component of a vehicle head-up display as will be described hereinafter with reference to FIG. 5.
    [0014] In particular, for head-up displays similar to a contact, the display 105 can be heated very irregularly by the sun. It is thus possible that only the medium and not the edge of the display 105 is heated to the critical temperature. This is why the sensor 130 according to an exemplary embodiment of the present invention captures the entire surface 110 of the display 105. In contrast to this, it is also possible to have characteristic temperature sensors such as NTC resistors (resistors). negative temperature coefficient) or resistors PTC (positive temperature coefficient resistors) or thermo-couples partially covering the display 105 and thus appearing in the virtual image. The measurement of the surface temperature of a liquid crystal display as a display unit 105 is, for example, done with the aid of a pyrometer as a temperature acquisition unit 130. Thus, the temperature of the unit of Since the liquid crystal display 105 is made without contact and in an integral manner over the entire surface, it avoids influencing the virtual image. A mask may be interposed between the temperature sensing unit 130 and the liquid crystal display unit 105 to define the input area of the temperature sensing unit 130 essentially to the only surface of the temperature sensing unit 130. This mask must be thermally conductive with cooled structures of the housing to minimize the influence of the mask temperature on the result of the measurement.
    [0015] To better capture the hot spots in different areas of the liquid crystal display unit 105, the temperature input unit 130 is made, for example, as a grid pyrometer. It makes it possible to measure and exploit separately the surface temperature in several different zones of the image display surface 110, for example in 64 zones each having 8 × 8 mm 2, as a function of the distance of the sensor 130 from the The liquid crystal display unit 105 may also be used. A temperature sensing unit may be used that captures only the maximum temperature of the image display surface. Advantageously, the control apparatus 135 is designed to control the cut-off unit 120 (also called the shutter) for the maximum value of the temperature ranges obtained. As an option, the control apparatus 135 only uses part of the measurement grid if, for example, areas outside the liquid crystal display surface 110 are also grasped. Another embodiment of the invention provides for measuring the surface temperature of the liquid crystal display unit 105 in the cell. For this, the temperature acquisition unit 130 directly measures the cell temperature of the display unit 105 by the structures 115, directly on the glass through the semiconductor structures of a TFT matrix. For example, the temperature capture unit 130 measures the through voltage of the transistor or diode structures of the TFT array and draws conclusions about the temperature. The structures 115 can be connected to very thin, virtually invisible conductors, which makes it possible to measure without damaging the displayed image. In addition, the structures 115 can be very numerous and, in principle, be addressed in groups on the display surface 110. This results in a high resolution that is local to the measurement. Diodes or components similar to the TFT matrix can also be added specifically for temperature measurement. Alternatively or additionally, the control apparatus 135 may also be connected to the structures 115 for capturing the surface temperature using precisely the structures 115. FIG. 2 is a diagram of a field of view display system 200 activated, according to an exemplary embodiment of the invention. The field of view display system 200, also known as the head-up display, comprises the display device 100 shown in FIG. 1 and may for example be integrated in the unrepresented dashboard of a vehicle. The display device 100 is provided with a housing 205 having an opening 210. The display unit 105 (also called display module) is installed in the housing 205 so that the image display surface 110 or opposite the opening 210 of the housing. In the vicinity of the aperture 210 is the cut-off unit 120 which closes the opaque opening 210 in the cut-off position to protect the image display surface 110 against incident radiation. The breaking unit 120 is shown in the open position in FIG. 2; this open position corresponds to the activated state of the field of view display system 200. The housing 205 further comprises a light source 215. The light source 215 is thermally coupled to an LED cooling member 217 and comprises for example three LEDs which illuminate the back of the display unit 105 opposite the image display surface 110. The box 205 with the light source 215 and the display unit 105 is also referred to as an image generator module (abbreviated PGU). In place of the opening 210, the housing 205 may have a wall of a transparent material.
    [0016] The temperature sensing unit 130 is outside the housing 205, oriented towards the image display surface 110 to capture all of this image display surface 110. The field display system vision 200 is further provided with a reflector 220 comprising for example a small mirror 225 and a large mirror 230 (also called main mirror). The small mirror 225 is located opposite the opening 210 of the housing. In the reflection zone of the main mirror 230, there is a transparent cover plate 235. The cover plate 235 is for example integrated into an opening of the dashboard. The image displayed on the image display surface 110 first arrives at the small mirror 225 which reflects the image towards the main mirror 230. The main mirror 230 projects the image through the cover plate 235 on the unshown windshield of the vehicle.
    [0017] In the opposite direction, the cover plate 235 reflects the incident solar radiation from the mirrors 225, 230 on the image display surface 110. The solar rays can heat the image display surface 110. To avoid this, the optical path of the main beam 125 between the small mirror 225 and the opening 210 of the housing is cut off by the breaking unit 120. In addition or alternatively to the embodiment presented of the breaking unit 120 the incident solar radiation can also be cut off on the image display surface 110 by using at least one of the mirrors 225, 230 of the field of view display system as a cutoff unit 120 or other 120. For this, at least one of the mirrors 225, 230 is mechanically moved to serve as a cutoff unit 120 by tilting for example around a horizontal axis so that the incident radiation no longer arrives on the 110 image display surface. at least one of the mirrors 225, 230 used as the breaking unit 120 is analogous to the control of the breaking unit 120 operating as a shutter. Fig. 3 is a diagram of a disabled field of view display system 200 according to an exemplary embodiment of the invention. Unlike FIG. 2, the cut-off unit 120 of FIG. 3 is in the cut-off position in which it opaquely covers the opening 210 of the housing. According to this exemplary embodiment, the temperature pickup unit 130 captures the temperature in the surface of the cutoff unit 120 away from the cutoff position with respect to the opening 210 of the housing. Figures 4a and 4b schematically show a display device 100 having an optical element 400 according to an exemplary embodiment of the invention. In FIGS. 4a and 4b there is in each case a detailed view of the device 100. The detailed views each show an optical element 400 which according to this embodiment is a sapphire disc. The sapphire disk 400 is stuck on the surface of the display unit 105 facing the light source. The glue used is a thermo-conductive optical adhesive, also called optical link. Thus, the sapphire disc 400 is thermally coupled to the display unit 105. The display unit 105 is exemplified in the form of a liquid crystal cell. At a short distance from the sapphire disc 400 is a field lens 405. The surface of the field lens 405 facing the sapphire disc 400 comprises a diffuser 410. The field lens 405 and the diffuser 410 together the light rays emitted by the light source to drive them through the sapphire disk 400 on the display unit 105. In the zone of the edge of the side of the sapphire disk 400 turned towards the field lens 405, for example a NTC resistor 415 constituting a temperature sensor; this resistor captures the temperature of the sapphire disc 400. The display unit 105 is surrounded by a display frame 420 electrically connected via a flexible conductor 422. The display frame 420, the disc of The sapphire 400 and the field lens 405 are each thermally coupled to a cooling member 425. A fan 430 equips the cooling member 425 (also called the radiator of the member 425). The field lens 405 and the sapphire disk 400 are thermally coupled to the cooling member 425 in each case by a Peltier element 435, also called a Peltier effect element or TEC element, that is to say with a coefficient of expansion. thermal). The Peltier element 435 is controlled by a pilot comprising, for example, four FET field effect transistors mounted in a bridge. Figure 4b is an enlarged representation of the edge area of the display unit 105 shown in Figure 4a. According to an exemplary embodiment, one or more LEDs as a light source, not shown, are thermally coupled to a cooling member; they emit their light in the direction of the display module. The image of the head-up display is formed on the display unit constituted by the LCD cell 105. The field lens 405 makes it possible to deflect the light of the LED diodes so that it passes through the optics of the LED. head-up system display with large and small mirror to arrive if possible in the field of vision. The diffuser 410 is necessary to improve the homogeneity of the brightness of the image. FIG. 5 is a diagram of a vehicle 500 equipped with a field of view display system 200 according to an exemplary embodiment of the invention. The field of view display system 200 is, for example, the system of FIGS. 2 and 3. The field of view display system 200 may be integrated into the dashboard of the vehicle 500. For this, the mirror main 230 is oriented so that the image of the head-up display 200, that is to say the main beam 125 emitted by the display unit 105 is reflected on the windshield 505 of the vehicle 500 through 235. The angle of incidence of the main beam 125 is chosen so that it is reflected by the windshield 505 in the area of the field of view 510 of the driver (this area is also called "vision box"). ") so that the driver can see the image as a virtual image behind the windshield 505. The unit 205 generates an illuminated background image on the display unit 105. This image is reflected by the mirrors 225, 230 of the head-up display and windshield 505 to the driver's driver who collects this virtual image. But if the solar rays 515 arrive substantially parallel to the main radiation 125 in the head-up display 200, these rays are focused on the display unit 105.
    [0018] Fig. 6 is a diagram of the display surface 110 having a temperature measurement frame 600 according to an exemplary embodiment of the present invention. The image display surface 110 is, for example, the image display surface of FIG. 1. The temperature capture unit not shown in FIG. 6 captures the temperature of the display surface of the display surface. 110 using the temperature measurement frame 600 in different measurement ranges. According to an exemplary embodiment, the image display surface 110 is subdivided by the temperature measurement flap 600 into a first partial area 605 and a second partial area 610; the size of the image display surface 110 corresponds to the sharp image size of an image displayed on the display surface 110. The first zone 605 corresponds to the middle of the image display surface 110 and the second zone 610, at the edge area of the image display surface 110. In Fig. 6, the image display surface 110 is heated by incident solar radiation arriving for example in the first zone 605. The second zone 610 is not exposed to solar radiation. Thus, the temperature of each of the zones 605, 610 can vary greatly. The temperature input unit captures this temperature difference. The control unit takes into account this controlled temperature difference of the breaking unit. According to this exemplary embodiment, the image display surface 110 is subdivided by the temperature measurement frame 600 into a plurality of partial areas 615; the temperature sensing unit captures the temperature of each of the partial zones 615. The control unit also takes into account the different temperatures of the other partial zones 615 for controlling the breaking unit. The image display unit 110 may be covered by a polarizing filter 620; In Fig. 6, the polarizing filter 620 protrudes from the edge area of the image display surface 110. The polarization filter is, for example, 45% transparent for the incident radiation. The temperature measurement frame 600 may extend over the entire surface of the display glass 620 or exceed the marginal area of the display glass 620. Thus, the temperature sensing unit captures both the temperature of the zones. 605, 610, 615 on the entire image display surface 110 and also the respective temperature of the display areas adjacent to the image display surface 110. The entire surface of the measurement frame of temperature 600 corresponds for example to 66 x 66 mm2.
    [0019] FIG. 7 very schematically shows the flowchart of a management method of a display device according to an example embodiment of the present invention. In step 705, a temperature signal is first recorded which represents at least the temperature of the image display surface, input by the temperature input unit by non-contact input and / or using the structures used to display the image. In step 710, with the temperature signal, an actuation signal is set to activate the cutoff unit between its cutoff position and its open position. In addition to the measurement made in the display range used, according to an exemplary embodiment, it is also possible to measure the temperature of a transparent structure thermally coupled to the liquid crystal display unit. Apart from the display surface used, it is also possible to use conventional sensors, such as NTC resistors, platinum resistance resistors (PT100) or thermoelements. The temperature thus obtained is used in particular when the shutter is closed, to monitor the change in the temperature of the display unit and if necessary to control the operation of the fan or Peltier effect elements or to regulate according to a closed control loop.
    [0020] The shutter is controlled to be closed when the temperature of the display unit exceeds a set limit value. According to a method for operating a measurement and for controlling the shutter, the limit value according to an exemplary embodiment can be set by the temperature at which the liquid crystal display unit still operates without being disturbed. especially in the case of liquid crystals, if there is no lightening subject to measurement inaccuracies. In addition, a duration of action can be taken into account in order to avoid long-term damage of the polarizing filter. The measured values can be filtered with a low-pass filter to eliminate noise and short-term disturbances.
    [0021] When the shutter is closed, the pyrometer can measure the shutter temperature in place of the temperature of the LCD unit. If a grid pyrometer is used as the temperature measurement frame, the input range can also be adapted by choosing the different measuring surfaces for the shutter. From the temperature curve we can monitor if the sun continues to act. If the temperature or a gradient or a reference quantity formed from these two values is less than a limit value, the shutter will be opened again.
    [0022] When the vehicle stops, that is to say when the ignition is off, generally the shutter is closed. The method of controlling the fan 430 and the Peltier element 435 as shown in FIGS. 4a and 4b comprises the following steps: If the temperature measured on the sapphire 400 by the temperature sensor 415 is greater than a first limit value which is, for example, 55 ° C, the Peltier effect element 435 is fed to lower the temperature of the sapphire 400 to 55 ° C. For this purpose, it is possible to use an analog control loop having a characteristic PI (proportional - integral mode). If the temperature of the sapphire 400 is less than a second limit value which is for example equal to 10 ° C, the Peltier effect element 435 is polarized in the opposite direction to heat the sapphire 400 and the display unit 105.
    [0023] If the temperature of the sapphire 400 is between the first and the second limits, neither heating nor cooling. To minimize the thermal resistance of the Peltier element 435, element 435 can be short-circuited. This method can also be applied when the shutter is closed. Stopping the vehicle, that is to say when the ignition is off, in general one does not heat or cool. Instead of a static comparison of the temperature of the display T and a limit value, it is also possible to use the speed AT / At variation of the temperature so that at the beginning of a solar light incident and rapid heating of the display unit 105 can be activated faster cooling. The limit value may vary depending on the rate of change. Alternatively or additionally, a comparison quantity is determined mathematically, which at the same time comprises the temperature and the rate of change. Temperature control can be done using an observed model that allows for even faster and more accurate temperature control with available measurement variables such as display unit temperature or temperature. sapphire and with known parameters of the system such as thermal conductivity and heat capacities. FIG. 8 is a block diagram of a device 800 for implementing a management method of a display device according to an exemplary embodiment of the invention. The device 800 includes a recording unit 805 for recording the temperature signal as well as a supply unit 810 for providing the adjustment signal using the temperature signal. The device 800 may be, for example, the control apparatus described with reference to Fig. 1. Fig. 9 is a schematic representation of a control apparatus 135 according to an exemplary embodiment of the present invention. The control device 135 is a microcontroller or an ASIC circuit or an FPGA circuit. The controller 135 is connected to a pyrometer 130 constituting the temperature sensing unit and a NTC resistor 415. The control apparatus 135 uses the respective temperature signal of the pyrometer 130 and the NTC resistor 405. to provide the temperature and, if appropriate, the rate of change of the temperature. The control apparatus 135 compares the temperature to a limit value and, based on this comparison, it actuates the shutter or flap 120 of the head-up display unit and the LEDs of the light source 215 or in turn. plus the Peltier element 435 and the fan 430. For this, the control apparatus 135 is connected to a motor driver 905 such as a two-phase bipolar stepper motor driver which serves as a control to the drive 905 of the shutter or shutter 120, for example in the form of a stepper motor. The control apparatus 135 is connected to the pilot 915 of the Peltier element 435. Finally, the control apparatus 135 is connected to the driver 915 for controlling the LEDs of the light source 215.
    [0024] 5 NOMENCLATURE OF MAIN ELEMENTS 100 Display device 105 Display unit / Liquid crystal display 110 Image display surface 115 Structure of the display unit 120 Cut / shutter unit 125 Path of the light beam 130 Temperature sensing unit 135 Control unit 200 Field of vision display system 205 Enclosure 210 Enclosure opening 215 Light source 217 Diode cooling device 220 Reflector 225 Small mirror 230 Large mirror 235 Cover plate 400 Optical element / sapphire disc 405 Field lens 410 Diffuser 420 Display frame 422 Flexible conductor 430 Fan 435 Element Peltier 500 Vehicle 505 Windshield 510 Field of view 600 Temperature measurement grid 605, 610, Partial zones 615 620 Polarizing filter 622 Display glass 700 Display system management system flowchart 705, 710 Process steps 700 905 Motor driver 910 Engine 915 Peltier Element Driver 920 LED Driver10
    权利要求:
    Claims (13)
    [0001]
    1) Display device (100) comprising - a display unit (105) provided with an image display surface (110), - a cutoff unit (120) movable between a release position and a cut-off position to cut the path of the light beam (125) falling on the image display surface (110) into the cut-off position and release this path in the release position; temperature (130) for sensing the temperature of the image display surface (110) by non-contact detection and / or using the structures (115) of the display unit (105) for displaying the image and - a control apparatus (135) for operating the cutoff unit (120) in accordance with the temperature of the image display surface (110) between the cutoff position and the release position.
    [0002]
    2 °) display device (100) according to claim 1, characterized in that the cutoff unit (120) is a shutter or a tilting mirror.
    [0003]
    Display device (100) according to claim 1, characterized in that the temperature acquisition unit (130) detects at least a first temperature of a first partial area (605) of the display surface. image (110) and a second temperature of a second sub-area (610) of the image display surface (110), the control apparatus (135) actuating the cut-off unit (120) by function of the first and / or second temperature.
    [0004]
    4 °) Display device (100) according to claim 3, characterized in that the control device (135) combines the first temperature at the second temperature to obtain a combined value and the control device (135) operates the cutoff unit (120) using the combined value.
    [0005]
    Display device (100) according to claim 3, characterized in that the temperature-sensing unit (130) captures at least one other temperature of another partial area (615) of the unit. image display (110), the control apparatus (135) operating the cutoff unit (120) further according to this other temperature.
    [0006]
    Display device (100) according to claim 1, characterized in that the temperature acquisition unit (130) captures the entire image display surface (110) to capture its temperature.
    [0007]
    7 °) display device (100) according to claim 1, characterized in that the temperature-sensing unit (130) further captures the temperature of the breaking unit (120) in the cut-off position, control apparatus (135) actuating the breaking unit (120) further in accordance with the temperature of the breaking unit (120) in the cut-off position.
    [0008]
    8 °) display device (100) according to claim 1, characterized in that it comprises at least one optical element (400) thermally coupled to the display unit (105) and another temperature sensing unit (415) for sensing the temperature of the optical element (400), the control apparatus (135) operating the breaking unit (120) further depending on the temperature of the optical element (400).
    [0009]
    9 °) display device (100) according to claim 1, characterized in that it comprises a housing (205) having an opening (210) associated with the path of the light beam (125), the display unit ( 105) being installed in the housing (205) so that the image display surface (110) faces the housing opening (210) and the cutoff unit (120) equips the opening (210). to close this opening (210) opaque in the cut-off position or to release this opening in the release position.
    [0010]
    10 °) Display device (100) according to claim 1, characterized in that the display unit (105) is a liquid crystal display.
    [0011]
    11 °) Vehicle field of view (200) display system (500), characterized in that it comprises a display device (100) according to any one of claims 1 to 10, comprising: a display unit (105) provided with an image display surface (110); - a cutoff unit (120) movable between a release position and a cutoff position to cut the path of the beam; light source (125) falling on the image display surface (110) in the off position and releasing said path in the release position; - a temperature sensing unit (130) for sensing the temperature of the surface of the image display (110) by non-contact detection and / or by using the structures (115) of the display unit (105) for displaying the image and - a control apparatus (135) for operating the cut-off unit (120) as a function of the temperature of the image display surface (110) between the cut-off position and the release position not.
    [0012]
    A method (700) for managing a display device having a display unit (105) with an image display surface (110), a cutoff unit (120) that can switch between a display unit release position and a cut-off position to cut the path of the light beam (125) to the image display surface (110) in the cut-off position or release this path in the release position and a feed input unit. temperature (130) for entering the temperature of the image display surface (110) by non-contact input and / or using the structures (115) of the display unit (105) for displaying the image Method (700) characterized in that it comprises the following steps: - recording (705) a temperature signal provided by a contactless detection by the temperature-sensing unit (130) and / or by using the temperature of the image display surface (110) captured using the structures (115) used for displaying the image and - providing (710) an actuation signal using the temperature signal to move the cutoff unit (120) between its cutoff position and its release position.
    [0013]
    13) A computer program comprising program code instructions for performing the steps of the method according to claim 12 when this program is executed on a computer.
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    同族专利:
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    FR3024580B1|2019-09-13|
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    DE102014214976A1|2016-02-04|
    CN105319721B|2019-06-18|
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    法律状态:
    2016-07-22| PLFP| Fee payment|Year of fee payment: 2 |
    2017-07-20| PLFP| Fee payment|Year of fee payment: 3 |
    2018-07-23| PLFP| Fee payment|Year of fee payment: 4 |
    2019-02-01| PLSC| Search report ready|Effective date: 20190201 |
    2019-07-24| PLFP| Fee payment|Year of fee payment: 5 |
    2020-07-27| PLFP| Fee payment|Year of fee payment: 6 |
    2021-07-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014214976.2|2014-07-30|
    DE102014214976.2A|DE102014214976A1|2014-07-30|2014-07-30|Display device, field of view display system and method and apparatus for operating such a display device|
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