• 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:
    An image generating system (10) for display, including head-up display, comprising: a liquid crystal display (12), a backlighting device (14) of said display (12). The projection system is characterized in that said backlighting device (14) comprises: - a support plate (18), - at least one light-emitting diode (16) disposed on the support plate (18) and emitting light in the direction of the screen (12), a wall (28) having a reflective inner surface delimiting a space between the support plate (18) and the screen (12), - said wall (28) extending above at least a portion of the support plate (18) so that the inner surface of the wall thus extended allows light to pass to the screen (12) and reflects toward the screen (12) of the light propagating towards the support plate (18).
    公开号:FR3020148A1
    申请号:FR1400929
    申请日:2014-04-17
    公开日:2015-10-23
    发明作者:Francois Grandclerc
    申请人:Valeo Comfort and Driving Assistance SAS；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The invention relates to image generation systems, in particular for heads-up displays. In particular, the invention relates to an image generation system and a head-up display for a motor vehicle. 2. Background Art The invention will find applications, for example, in motor vehicles to inform users of the vehicle, especially its driver.
    [0002] It is known to equip a motor vehicle with a display system, said head held. Such a system is placed in the field of vision of the driver and displays information on the state of the vehicle, traffic or other.
    [0003] This type of head-up display for a motor vehicle requires obtaining an image with a sufficient brightness so that the user, and in particular the driver of the vehicle, can sufficiently see the image, and in any situation, according to the weather conditions and day and night.
    [0004] Among the possible technologies for forming such an image by means of the display, the most used in the prior art is the liquid crystal screen technology, in particular thin-film transistor LCDs, called TFT-LCD ( for Thin-Film Transistor Liquid Crystal Display in English). These TFT-LCD screens require, for the display of an image, a backlight usually made by a plurality of light-emitting diodes (LED or LED for Light-Emitting Diode). In practice, this TFT-LCD screen and the backlight are included in a set called image generation system. Nevertheless, these TFT-LCD screens have the disadvantage of significantly reducing the light power from the backlight: with the use of a conventional TFT-LCD screen, it is estimated that the transmission rate of the screen is d about 5% of the light power of the backlight. This low value is due in particular to the first polarizer present in the screen which allows only the light corresponding to a certain polarization, whereas the LEDs produce light with several polarizations: all the polarizations do not correspond to that which passes through the polarizer are then lost. Therefore, for the display of an image by the display with a sufficient luminous power, it is necessary to use a backlight of a significant luminous power since the displayed image will have a light power of the order of 5% of this backlighting power. This generates significant energy consumption, as well as significant losses in the form of heat, which in addition can degrade the components and therefore require the use of large heat sink. 3. OBJECTIVES OF THE INVENTION The invention aims to overcome at least some of the disadvantages of image generation systems and known displays. In particular, the invention also aims to provide, in at least one embodiment of the invention, a display that displays an image with sufficient light output.
    [0005] The invention also aims to provide, in at least one embodiment, a display and an image generation system which make it possible to use a backlight of a smaller power and thus to reduce the power consumption. and heat dissipation. The invention also aims to provide, in at least one embodiment of the invention, a display and a system for generating images of reduced size. 4. DISCLOSURE OF THE INVENTION To this end, the invention relates to a system for generating images for a display, in particular a head-up display, comprising: a liquid crystal screen, a device for backlighting said screen, characterized in that said backlighting device comprises: a support plate, at least one light-emitting diode disposed on the support plate and emitting light towards the screen, a wall having a reflective inner surface delimiting a space between the support plate and the screen, said wall extending over at least a portion of the support plate so that the inner surface of the wall thus extended allows the light to pass in the direction of the screen and to reflect towards the light screen propagating towards the support plate.
    [0006] An image generation system according to the invention thus allows the recycling of the light emitted by the light-emitting diodes of the backlighting device coming from a reflection of part of the light in the direction of the support plate. reflection is caused by the passage through the light of the various elements placed between the light emitting diodes and the screen, and by the screen itself. All of these elements are called optical system. This portion of the light again passes through the optical system and is then reflected on the extension of a wall above the support plate to be returned to the screen. The wall defines a space between the support plate and the screen, forming for example a housing around the backlight device. The extension of this wall is called in the following description box bottom. The optical system and the case back cause a change in the characteristics of the part of the reflected light which, by crossing again the optical system in the direction of the screen, will be partly transmitted to the screen and partly to again reflected in the direction of the support plate. The extension of the wall surrounding the device on the surface of the support plate to create this case bottom makes it possible not to add an additional element to the image generation system, the wall being necessary for the generation system. images to prevent light leakage and to homogenize the light, but only to add material to an already existing piece. Advantageously and according to the invention, the surface of the wall has a reflection coefficient greater than 90%, preferably greater than 93%. Advantageously and according to the invention, the surface of the extended wall is located at least above a portion of the support plate.
    [0007] According to this aspect of the invention, the longer the surface of the extended wall occupies a large area, the more light in the direction of the support plate will be reflected back to the screen for backlighting thereof.
    [0008] Advantageously and according to the invention, the wall extends substantially over the entire surface of the support plate with the exception of the surface occupied by the light-emitting diodes so as to reflect almost all of the light propagating in direction of the support plate.
    [0009] Advantageously and according to the invention, the wall extended above the support plate is positioned at a distance from said support plate so that an air gap can be established between the wall and the support plate. Advantageously and according to the invention, the backlighting device comprises at least one light recycling filter emitted by the light-emitting diodes, located between the light-emitting diodes and the screen, ensuring the transmission of a part of the light towards the screen and the return of non-transmitted light to the light-emitting diodes. According to this aspect of the invention, the recycling filter makes it possible to send a portion of the light back to the light-emitting diodes. This part of the reflected light is advantageously light whose characteristics do not comply with the characteristics necessary for good quality backlighting, in particular because this part of the light would have been lost at the level of the liquid crystal screen. . This part of the light is then reflected on the case bottom in the direction of the screen. This reflection and the crossing of the various elements of the optical system allow a change in the characteristics of the light that returns to the recycling filter. Advantageously and according to the invention, at least one light recycling filter is a polarization filter adapted to let the light arriving on the polarization filter with a particular polarization and adapted to reflect light arriving on the polarization filter with a polarization different from the particular polarization. According to this aspect of the invention, the liquid crystal screen only allowing the light having a particular polarization due to the presence of a polarizer in the screen, the polarization filter makes it possible to reflect the part of the light whose polarization is different from this particular polarization. The light usually lost at the LCD screen is reflected back to the case bottom. The case bottom and the optical system allow a change in the polarization of the reflected light, and said reflected light in the direction of the screen is filtered again by the polarization filter. Advantageously and according to the invention, at least one light recycling filter is a prismatic filter adapted to allow the light arriving on the prismatic filter to pass through with an angle of incidence less than a predetermined angle and in a given plane, and adapted to reflect the part of the remaining light. According to this aspect of the invention, the prismatic filter makes it possible to let only the light arriving substantially perpendicular to the filter in a given plane, in order to reduce the divergence of the light in the direction of the liquid crystal screen. The light reflected by the prismatic filter is reflected back onto the case bottom disposed on the support plate and returns to the prismatic filter, and a portion of this reflected light arriving on the filter with an angle of incidence smaller than the predetermined angle passes through the filter and another part is reflected again.
    [0010] Advantageously and according to the invention, the backlighting device comprises at least two prismatic filters, each filtering according to the incidence of light in a plane, and arranged in such a way that the planes in which they filter the incidence are substantially perpendicular. According to this aspect of the invention, the addition of a second filter filter in a given plane different from the first filter allows the filtering of a larger part of the light. Advantageously and according to the invention, the backlighting device comprises a lens array adapted to collimate the light coming from the light-emitting diodes in the direction of the liquid crystal screen.
    [0011] According to this aspect of the invention, the light-emitting diodes emitting light in a substantially omnidirectional manner, the lens array makes it possible to obtain a collimated light directed towards the liquid crystal screen in order to limit the losses.
    [0012] Advantageously and according to the invention, the backlight device comprises a diffuser adapted to homogenize the light from the light emitting diodes. According to this aspect of the invention, the homogenization of the light allows a good distribution of light on the liquid crystal screen. The diffuser also makes it possible to mask the inside of the backlighting device. Advantageously and according to the invention, the liquid crystal screen is inclined at a predefined angle with respect to the support plate and the recycling filter or filters. According to this aspect of the invention, the predefined angle makes it possible to obtain a vertical virtual image as part of the use of the image generation system in a head-up display. Advantageously and according to the invention, the image generation system comprises, successively and in this order, between the support plate and the screen: the extended surface of the wall, the lens array, the diffuser, the one or more prismatic filters, the polarization filter.
    [0013] The invention also relates to a display, in particular a head-up display, characterized in that it comprises an image generation system according to the invention. The invention also relates to an image generation system and a display characterized in combination by all or some of the characteristics mentioned above or below. 5. List of Figures Other objects, features and advantages of the invention will become apparent on reading the following description given solely by way of non-limiting example and which refers to the appended figures in which: FIG. 1 is a diagrammatic view of a section of an image generation system according to an embodiment of the invention, FIG. 2 is a schematic view of a support plate of an image generation system according to an embodiment of the invention. FIG. 3 is a schematic perspective view of the case of an image generation system according to one embodiment of the invention; FIG. 4 is a schematic view of a system for generating images of image and a head-up display according to the invention. 6. Detailed Description of an Embodiment of the Invention The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined to provide other embodiments. FIG. 1 represents a schematic view of a section of an image generation system 10 according to one embodiment of the invention. The image generation system 10 comprises a liquid crystal screen, here a thin film transistor LCD 12 and a backlighting device 14. Thin-film transistor LCD 12 is commonly referred to as a TFT-LCD (for Thin-Film Transistor Liquid Crystal Display), and allows image formation by the image generation system. The function of the backlighting device 14 is to provide the screen 12 with the light necessary for forming the image. To do this, the backlighting device 14 comprises in particular at least one and preferably a set of light-emitting diodes 16, also called LEDs or LEDs (for Light Emitting Diodes in English, and used in the following description), placed on a support plate. In this embodiment, the support plate consists of a printed circuit 18, also called PCB (for Printed Circuit Board in English). The printed circuit used can be for example of the type FR4 (for Flame Resistant 4 in English) or IMS (for Insulated Metal Substrate in English). The use of an IMS circuit notably allows better heat dissipation. The printed circuit board 18 allows both the physical medium and the electrical connection (to a power supply and any other electronic components not shown) of the LEDs 16. The LEDs 16 are placed so as to emit light in the direction of the light. screen 12. The screen 12 is inclined by a predefined angle, preferably between 0 ° and 40 ° so as to obtain a vertical virtual image in the context of the use of the image generation system in a display head held high. Between the screen 12 and the LEDs 16, there are different elements of treatment and / or filtering of the light to optimize the backlight, called their overall optical system. In the embodiment shown in FIG. 1, these elements forming part of the backlighting device 14 and successively traversed by the light coming from the LEDs 16 in the direction of the screen 12, are: a network 20 of lenses, allowing the collimation of the light coming from the LEDs 16 to limit the losses of light power if a portion of light is not directed towards the screen 12. Generally, the lens array 20 comprises an LED lens 16, each lens being disposed at above each LED 16 - a diffuser 22, allowing the homogenization of the light, so as to illuminate the screen 12 in a homogeneous manner to allow the formation of an image of good quality, that is to say substantially uniform brightness. In addition, the diffuser 22 can hide the inside of the backlight device. one or more recycling filters, grouped under the reference 24, for example: two crossed prismatic filters, making it possible to let light arriving on the prismatic filters with an angle of incidence less than a predetermined angle and in a given perpendicular plane; to the plane of the prismatic filter. A light beam arriving on a prismatic filter with an angle of incidence greater than the predetermined angle and in a plane different from the given plane will be even less reflected that said plane of incidence of the beam is different from the given plane. Thus, the use of the two crossed prismatic filters, in particular filters in substantially perpendicular planes, makes it possible to filter the major part of the light beams, so that the light beams arriving on the filter outside a cone of incidence of angle equal to the predetermined angle will be reflected. Prismatic filters are here films of polymer material composed of a multitude of micro-prisms aligned in the plane of the prismatic filter along lines perpendicular to the given plane. This type of film is for example marketed by 3M under the name of BEF (for Brightness Enhancement Film in English). a polarization filter for passing light arriving on the polarization filter with a particular polarization and adapted to reflect the light arriving on the polarization filter with a different polarization. The light emitted by the LEDs 16 being a non-polarized light, only the portion of this light having a polarization collinear with this particular polarization passes through the polarization filter, the rest of the light being reflected. The polarization filter is here a film of polymer material. This type of filter is marketed for example by the company 3M under the name of DBEF (for Dual Brightness Enhancement Film in English). The various recycling filters 24 therefore make it possible, for example, to reflect light which would have been filtered at the level of the screen 12 itself because of its internal components, in particular straight polarisers, by reflection of the light which does not have any light. polarization, or to reflect light that propagated in a cone of lighting too wide. This portion of the light reflected by the recycling filter (s) in the direction of the printed circuit is subsequently called recycled light. So that the light propagating from the printed circuit board 18 to the screen 12 or from the screen 12 to the printed circuit 18 remains in the backlighting device 14, the space contained therein, between the printed circuit 18 and the screen 12, is surrounded by a wall, here a housing 28, generally called light box especially in the automotive field. To avoid losses of light power in the housing 28 by light absorption, it is made of a reflective material such as polycarbonate (abbreviated PC). For optimal reflection of the light, the housing 28 must have a very flat polished surface.
    [0014] In order not to lose this recycled light, which would cause a significant drop in light output, the housing 28 of the image generation system 10 is extended substantially on or above the entire surface of the printed circuit 18 with the exception of the area occupied by the LEDs 16 and which reflects almost all the light recycled, which then propagates back to the screen 12. The portion of the housing 28 which extends on the surface of the printed circuit is called the bottom of the housing 26 in the following description. The bottom of the case 26 is made of the same material as the case. The bottom of the housing 26, the optical system and the housing 28 allow, due to the reflection of light on or through their respective surfaces, to change the characteristics of the recycled light, including its polarization and its direction of propagation. Thus, the recycled light which is reflected by the bottom of the housing 26 and which propagates towards the screen 12 has a different polarization and an angle of incidence with the recycling filter or filters different, and therefore can cross the or recycling filters 24 if these characteristics allow the passage of light through the filter or filters 24 recycling. If the light still does not have the characteristics necessary for crossing the recycling filter or filters, the light is recycled again and the cycle described above is repeated. This cycle is represented in FIG. 1 by arrows 30, 31, 32, 34, 36, 37. The LEDs 16 emit unpolarized light. Two arrows 30, 31 represent two parts of this polarized light, of respective polarizations P1 and P2. The polarization filter passes the portion of the light whose polarization is equal to P1. The portion of the polarization light P1 therefore passes through the polarization filter and goes to the screen 12 in the direction represented by the arrow 32, and the portion of the polarization light P2 is recycled, that is to say reflected to the printed circuit 18, as represented by the arrow 34. This part of the recycled light is reflected on the bottom of the housing 26 in the direction of the screen 12, and a part of this reflected light has a modified polarization henceforth equal to P1, represented by the arrow 36. This part of the polarization light P1 therefore passes through the polarization filter after recycling and reflection, as shown on the arrow 37. The same phenomenon occurs in a similar way depending on the angle incidence of light, thanks to prismatic filters. The case bottom 26 does not cover the LEDs 16 so as not to obscure them and thus to allow the backlighting of the screen 12. The only part of the recycled light that is not reflected towards the screen 12 is therefore the light that arrives on the printed circuit 18 on the surface occupied by the LEDs 16. In order not to disturb the illumination of the screen 12 by the LEDs 16 and to avoid the overheating of the case bottom 26 located at proximity of the LEDs 16, one can also reduce the area occupied by the case bottom 26 on the printed circuit 18 by adding a margin around each LED 16, as shown in the following description with reference to Figure 2. According to the embodiment of the case bottom, especially if the thickness of the housing is important, the holes formed by the margin around each LEDs can be beveled to optimize the reflective surface without disturbing the illumination of the screen. The case bottom 26 being an extension of the case 28, it is composed of the same material as the case, that is to say in this embodiment of the polycarbonate. This material has important reflection coefficients if it has a sufficiently polished surface. In practice and for proper operation of the backlighting device, the reflection coefficient is greater than or equal to 90%, preferably greater than or equal to 93%. Other materials may be envisaged for the case bottom 26, provided that these are also adapted to the other constraints of the image generation system 10, in particular thermal stresses: the case bottom 26 surrounds the LEDs 16 which emit with a high luminous power and therefore give off heat. This heat can alter the bottom case 26 if it is not made of a suitable material. This thermal stress is all the more important that the image generation system 10 is in an environment of limited size in which the heat evacuation is difficult, typically for on-board use, for example in a vehicle. According to one embodiment, the housing may be fixed on the support plate, for example by gluing, screwing, crimping, etc. The box attached to the support plate reduces disturbances with the cone of light emitted by the LEDs. According to another embodiment, the housing may be placed above the support plate so as to leave a blade of air between the two, allowing ventilation and therefore better heat dissipation. The housing may be arranged above the support plate by means of a spacer mounting. In this embodiment, the margin between each LEDs and the beveling of the holes is adapted so as not to disturb the cone of light emitted by the LEDs.
    [0015] FIG. 2 represents a schematic view of a printed circuit 18 of an image generation system 10 according to one embodiment of the invention. The LEDs 16 of the backlighting device 14 are here eight in number, distributed uniformly over the entire surface of the printed circuit 18. Each LED is composed of a base 16a and an optical portion 16b. The LEDs 16 are surrounded by the case bottom 26 which occupies the surface of the printed circuit 18 which is not occupied by the LEDs 16. In this embodiment and as previously explained, a margin area is provided around each LED 16 on which there is no case bottom 26 to prevent the case bottom 26 from disturbing the emission of light by the LEDs 16 and to prevent the case bottom 26 from being altered by excessive heat dissipation by the LEDs. Figure 3 schematically shows in perspective the housing 28 of the image generation system 10 according to one embodiment of the invention. The entire housing 28 is composed of the same reflective material, for example polycarbonate as described above. The entire housing 28 can thus for example be manufactured in a single mold. The walls 38 of the housing make it possible to surround the space of the backlight device, and the case bottom 26 is provided with orifices 40 adapted to be placed at the level of the LEDs 16 as represented with reference to FIG. Case 28 in FIG. 3 is represented by way of example: in particular, the dimensions of the case are caused to be modified as a function of the size of the screen 12, the number of LEDs 16, the number of elements between the plate of support and screen 12, etc. As illustrated in FIG. 4, the invention also relates to a head-up display comprising a system 10 for generating image images according to the invention.
    [0016] The image generation system 10 described with reference to FIG. 1 forms an image using the TFT-LCD screen 12. Downstream of the screen 12 depending on the direction of movement of the light beam, said display comprises at least one semi-reflecting plate 126 and a reflection device 125 interposed in the path of the image between the screen 12 and the semi-reflecting plate 126, the reflection device 125 comprising one or more flat or concave mirrors, such as 4. In this figure, the path of the image is symbolized by three dotted arrows 30 which are reflected on the reflection device 125 before being displayed through the semi-reflecting blade 126. The latter allows a magnification and / or, by transparency, a display of the image beyond the semi-reflective plate, in particular beyond the windshield of the equipped vehicle, at a virtual screen 130, obtained at the using the semi-reflective blade 126. This blade 126 has a reflection power of at least 20%, which allows the user to see through the blade the road taken by the vehicle, while enjoying a high contrast to see the displayed image. Alternatively, the display of the image can take place at the windshield of the vehicle equipped with said display.
    权利要求:
    Claims (13)
    [0001]
    REVENDICATIONS1. An image generation system (10) for a display, in particular a head-up display, comprising: - a screen (12) with liquid crystal, a device (14) for backlighting said screen (12), characterized in that said device (14) backlighting comprises: - a support plate (18), - at least one light-emitting diode (16) disposed on the support plate (18) and emitting light towards the screen (12) a wall (28) having a reflective inner surface delimiting a space between the support plate (18) and the screen (12), said wall (28) extending over at least a portion of the plate support (18) so that the inner surface of the wall thus extended allows the light to pass in the direction of the screen (12) and reflects towards the screen (12) of the light propagating towards the support plate (18).
    [0002]
    2. Image generating system according to the preceding claim, characterized in that the inner surface of the wall has a reflection coefficient greater than 90%, preferably greater than 93%.
    [0003]
    An image generating system according to one of the preceding claims, characterized in that the wall (28) extends substantially over the entire surface of the support plate (18) with the exception of the surface occupied by light-emitting diodes.
    [0004]
    An image generation system according to one of the preceding claims, characterized in that the wall (28) extended above the support plate (18) is positioned at a distance from said support plate (18) so that an air gap can be established between the wall (28) and the support plate (18).
    [0005]
    Image generating system according to one of the preceding claims, characterized in that the backlighting device comprises at least one filter (24) for recycling the light emitted by the light-emitting diodes (16), located between the light-emitting diodes (16) and the screen (12), transmitting a portion of the light to the screen (12) and returning the non-transmitted light to the light-emitting diodes (16).
    [0006]
    6. Image generation system according to the preceding claim, characterized in that at least one filter (24) for recycling the light is a polarization filter adapted to let the light arriving on the polarization filter with a polarization. particular and adapted to reflect the light arriving on the polarization filter with a polarization different from the particular polarization.
    [0007]
    An image generating system according to claim 5, characterized in that at least one light recycling filter (24) is a prismatic filter adapted to pass light arriving on the prismatic filter with an angle of incidence lower than a predetermined angle and in a given plane, and adapted to reflect the portion of the remaining light.
    [0008]
    8. Image generating system according to the preceding claim, characterized in that the device (14) backlight comprises at least two prismatic filters, each filtering according to the incidence of light in a plane, and arranged so the planes in which they filter the incidence are substantially perpendicular.
    [0009]
    An image generating system according to one of the preceding claims, characterized in that the backlighting device (14) comprises a lens array (20) adapted to collimate light from the light emitting diodes (16). in the direction of the LCD screen (12).
    [0010]
    10. An image generating system according to one of the preceding claims, characterized in that the device (14) backlight comprises a diffuser (22) adapted to homogenize the light from the light emitting diodes (16).
    [0011]
    An image generating system according to one of the preceding claims, characterized in that the LCD screen (12) is inclined at a predefined angle with respect to the support plate (18) and at least one of the recycling filters (24).
    [0012]
    12. Image generating system according to claims 6, 7, 9 and 10, characterized in that it comprises, successively and in this order, between the support plate (18) and the screen: the surface of the extended wall, - the lens array (20), the diffuser (22), the prismatic filter (s), - the polarization filter.
    [0013]
    13. Display, including head-up display, characterized in that it comprises an image generation system (10) according to one of the preceding claims.
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    同族专利:
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    法律状态:
    2015-04-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-28| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-28| PLFP| Fee payment|Year of fee payment: 4 |
    2018-04-26| PLFP| Fee payment|Year of fee payment: 5 |
    2019-04-29| PLFP| Fee payment|Year of fee payment: 6 |
    2020-04-30| PLFP| Fee payment|Year of fee payment: 7 |
    2021-04-29| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1400929A|FR3020148B1|2014-04-17|2014-04-17|IMAGE GENERATING SYSTEM FOR DISPLAY AND ASSOCIATED DISPLAY|
    FR1400929|2014-04-17|FR1400929A| FR3020148B1|2014-04-17|2014-04-17|IMAGE GENERATING SYSTEM FOR DISPLAY AND ASSOCIATED DISPLAY|
    EP15725748.6A| EP3132309A1|2014-04-17|2015-04-16|Image-generation system for head-up display and associated head-up display|
    PCT/FR2015/051032| WO2015159030A1|2014-04-17|2015-04-16|Image-generation system for head-up display and associated head-up display|
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