![]() IMAGE GENERATING DEVICE AND HIGH HEAD DISPLAY OF MOTOR VEHICLE
专利摘要:
The subject of the invention is an image generation device (10) for a motor vehicle head-up display (100), comprising a liquid crystal display (12) and a backlighting device (14), said display device back light (14) comprising: at least one light-emitting diode (16), a housing (28; 29) surrounding the space between the at least one light-emitting diode (16) and the liquid crystal screen (12), characterized in that said housing (28; 29) is bent, the image generating device (10) further comprising a reflecting surface (31; 32) arranged in a bent portion (28c; 29c) of the housing (28; 29) and oriented to reflect the light emitted by the at least one light-emitting diode (16) towards the screen (12). The invention also relates to a head-up display (100). 公开号:FR3030065A1 申请号:FR1557270 申请日:2015-07-29 公开日:2016-06-17 发明作者:Francois Grandclerc;Pierre Mermillod 申请人:Valeo Comfort and Driving Assistance SAS; IPC主号:
专利说明:
[0001] The invention relates to an image generation device for a motor vehicle head-up display for informing the users of the vehicle, in particular its driver. It is known to equip a motor vehicle with a head-up viewer, also known as head-up display or HUD (for "Head-Up Display"). Such a display is placed in the field of vision of the driver and displays information relating to the state of the vehicle, traffic or other. This type of head-up display for a motor vehicle requires obtaining an image with sufficient brightness so that the user, and in particular the driver of the vehicle, can sufficiently see the image, and this in any situation, day and night and according to the weather conditions. [0002] Among the possible technologies for forming such an image by means of the head-up display, the most used in the prior art is the liquid crystal screen technology, in particular of thin-film transistor, called TFT, liquid crystal displays. -LCD (for "Thin-Film Transistor Liquid Crystal Display"). 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 device (or "imager" in English). Between the liquid crystal display and the LEDs, the image generation device comprises various elements for processing and / or filtering the light in order to optimize the backlighting, called in their optical system assembly. These elements successively traversed by the light coming from the LEDs toward the liquid crystal screen are generally a lens array, a collimator and a diffuser for the collimation and homogenization of the light coming from the LEDs. The collimator is formed of a cylindrical biconvex lens extending transversely over a dimension at least equal to the width of the liquid crystal screen, such as of the order of 30 millimeters, so as to illuminate the screen 3030065 2 liquid crystal over the entire width. It is therefore a lens of significant size, usually made specifically. The image generation device can be installed under the vehicle dashboard. However, the available space under the dashboard is reduced. It is particularly occupied by the ventilation duct, the steering column and other components of the vehicle so that it is not always possible to integrate an image generation device. An object of the present invention is to provide an image generation device that is better adapted to the space available in the vehicle. For this purpose, the subject of the invention is an image generation device for a motor vehicle head-up display, comprising a liquid crystal screen and a backlighting device, said backlighting device comprising: at least one light-emitting diode, a housing surrounding the space between the at least one light emitting diode and the liquid crystal screen, characterized in that said housing is bent, the image generating device further comprising a reflecting surface arranged in a bent portion of the housing and oriented to reflect the light emitted by the at least one light emitting diode towards the screen. The use of an angled housing and a reflective surface arranged in its angled portion allows to fold the light beam backlight. This retains the backlight function of the LCD screen while allowing a certain modularity of the image generation device which may have a shape better adapted to the available space. According to a first exemplary embodiment, the reflecting surface is concave. A concave reflecting surface makes it possible to form an additional collimation stage of the light, making it possible to obtain a beam of parallel light rays at the level of the liquid crystal screen, without requiring the additional use of an additional collimating lens. particularly cumbersome and expensive. The reflective surface can be defined by the sum of the equation of a conic and a series of polynomials. The parameters of the equation of the reflective surface can thus be optimized by software simulation. According to a second exemplary embodiment, the reflecting surface is an inclined flat surface. According to one or more features of the image generation device, taken alone or in combination: the image generation device comprises a support fixed to the housing, the reflecting surface being formed by a metal coating deposited on the support, the support is obtained by plastic injection, the reflecting surface is formed by an inner surface of the bent portion of the housing, the reflecting surface is a mirror surface, the bend of the housing forms an angle of between 30 and 120 °. The invention also relates to a head-up display, characterized in that it comprises an image generation device as described above. Other objects, features and advantages of the invention will appear on reading the following description given solely by way of nonlimiting example and which refers to the appended figures in which: FIG. 1 is a schematic perspective view of a first embodiment of an image generation device, FIG. 2 shows a schematic view of a head-up display, FIG. 3 is a schematic perspective view of a second exemplary embodiment of a device for generating images. Figs. 4 is a view of the image generating device of Fig. 3, rotated in a view substantially from below. In these figures, the identical elements bear the same reference numbers. In the remainder of the description, the X, Y and Z directions indicated in FIGS. 1 and 3 will be adopted by way of the fixed trihedron (X, Y, Z) with respect to the image generation device 10. FIG. 1 shows a first exemplary embodiment of an image generation device 10. The image generation device 10 comprises a liquid crystal display 12 and a backlighting device 14. The display liquid crystal 12 is for example a thin-film transistor liquid crystal display, commonly called TFT-LCD screen (for "Thin-Film Transistor Liquid Crystal Display"). The function of the backlighting device 14 is to supply the liquid crystal 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 18 of the backlight device 14. In this embodiment, the support plate 18 comprises a printed circuit 15, also called PCB (for "Printed Circuit Board" in English). The printed circuit used can be for example of type FR4 (for "Flame Resistant" in English) or IMS (for "lnsulated Metal Substrate" in English). The use of an IMS circuit notably allows better heat dissipation. The printed circuit allows both the physical carrier and the electrical connection (to a power supply and any other electronic components not shown) of the LEDs 16. Between the liquid crystal display 12 and the LEDs 16, there are different processing and / or light filtering elements to optimize backlighting, referred to in their overall optical system. In the embodiment shown in FIG. 1, these elements forming part of the backlight device 14 and successively traversed by the light coming from the LEDs 16 in the direction of the liquid crystal screen 12, are a lens array 20 and a diffuser 22. The lens array 20 makes it possible to form a first collimation stage 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 liquid crystal screen 12. Generally, the lens array 20 comprises an LED lens 16, each lens being disposed above each LED 16. [0003] The diffuser 22, arranged upstream of the liquid crystal screen 12 in the light propagation direction, allows the homogenization of the light, so as to illuminate the liquid crystal screen 12 to allow the formation of light. an image of good quality, that is to say substantially uniform brightness. [0004] In addition, the diffuser 22 can mask the inside of the backlighting device 14. The backlighting device 14 also includes a housing 28 surrounding the space between the LEDs 16 and the liquid crystal display 12 , generally called light box especially in the automotive field. The housing 28 allows in particular that the light propagating from the LEDs 16 to the liquid crystal screen 12 remains in the backlighting device 14. The housing 28 is bent, that is to say that its main orientation n is not rectilinear but has at least one inclination. The elbow of the housing 28 forms an angle, for example between 30 and 120 °. For example, and as shown in FIG. 1, the housing 28 has a bend forming an angle of the order of 90 °. The bent portion 28c of the housing 28 may be inclined in the space in one or more directions of the mark (X, Y, Z), depending on the available space. [0005] The image generating device 10 further comprises a reflective surface 31 arranged in the bent portion 28c of the housing 28. The reflecting surface 31 is oriented to reflect the light emitted by the LEDs 16 towards the screen. liquid crystal 12. The use of an angled housing 28 and a reflecting surface 31 25 arranged in its angled portion 28c can fold the light beam backlight. This retains the backlight function of the LCD 12 while allowing a certain modularity of the image generation device 10 which may have a shape better adapted to the available space. [0006] The reflecting surface 31 may be a mirror surface which reflects the light rays symmetrically, the angle of incidence of the light rays being equal to the angle of reflection so that all the light rays can be directed towards the diffuser 22 The reflection coefficient of the concave mirror surface 31 is, for example, greater than or equal to 90%. According to a first exemplary embodiment shown in FIGS. 1 and 2, the reflecting surface 31 is concave. A concave reflecting surface 31 makes it possible to form a second collimation stage of the light, making it possible to obtain a beam of parallel light rays at the level of the liquid crystal screen 12, without requiring the additional use of a collimating lens. extra, particularly bulky and expensive. The concave reflecting surface 31 may have a portion of sphere, ellipse, parabola or hyperbola. According to an exemplary embodiment, the reflecting surface 31 is defined by the sum of the equation of a conic and a series of polynomials. This surface can be defined by computer program, such as a "Freeform Surface" in English obtained by a design program of 15 optical designs such as "Zemax". The equation of the reflecting surface 31 can thus be defined in the reference (X, Y, Z) by the following equation: where: N is the number of polynomial coefficients, A, is the coefficient of the second polynomial, c is the curvature which is equal to the inverse of the radius of curvature R of the conic (c = 1 / R), r is the root of (x2 + y2), 25 k is the conicity (or constant of the conic), and E, is the term of the x and y polynomial of degree I. According to the taper value k, the profile of the reflecting surface 31 will take different forms (k> 0: elliptic, k = 0: spherical, -1 <k <0: elliptic, k = -1: parabolic, k <-1: hyperbolic). [0007] The maximum order of the series of polynomials is twenty for a maximum of 230 polynomial coefficients. The values of the x and y positions are divided by a normalized radius value so that the polynomial coefficients are dimensionless. The number of polynomial coefficients N can be limited to six, so that the series of polynomials has 27 terms: two terms of order one (x, y),,, three three-order terms (x2, xy, y2), four terms of order three (x3, x2y xy2 y3),,,,, five terms of order four (x4, x3y x2y2 xy3 y4) six terms of order 5 (x5, x4y, x3y2, x2y3, xy4, 5, y) and seven terms of order 6 (x6, x5y, x4y2, x3y3, x2y4, xy5, y6). The parameters of the equation of the reflecting surface 31 can thus be optimized by software simulation. [0008] The housing 28 is for example of plastic material. It is for example obtained by injection. In addition, the housing 28 may be made of a reflective material, such as polycarbonate, to prevent losses of light power by absorption of light. [0009] It is furthermore provided, for example, that the reflecting surface 31 is a separate element of the housing 28, to facilitate the construction. The image generation device 10 may comprise a support 26 fixed to the housing 28, for example by gluing or by force mounting, possibly with the interposition of foam. The support 26 is for example of plastic material. It can be obtained by plastic injection, which makes it possible to obtain any shape, including complex forms of the "Freeform Surface" type. The reflecting surface 31 may be formed by a metal coating, such as aluminum, deposited on the support 26. [0010] Figure 2 shows the image generation device 10 in a head-up display. Downstream of the liquid crystal display 12, the display 100 comprises a plane mirror 126 and a combiner 125. The image path is symbolized by three dashed arrows 30 which, once issued from the generating device 10, is reflected on the mirror 126 before being projected on the combiner 125. The latter allows a magnification and / or, by transparency, a display of the image beyond the combiner 125, in particular beyond the windshield of the vehicle in an area 128 or the windshield of the vehicle equipped with said display 3030065 8 100. The light 30 which is projected on the combiner 125 is reflected on the eye 127 of the driver of the motor vehicle. FIGS. 3 and 4 illustrate a second exemplary embodiment of the image generation device 10. [0011] In this embodiment, the optical system comprises a collimator 21 arranged between the liquid crystal screen 12 and the lens array 20, making it possible to form a second collimator stage to obtain a beam of parallel light rays, the LEDs 16 being positioned in the focus of the collimator 21. [0012] The collimator 21 is for example a cylindrical biconvex lens, that is to say that the biconvex shape of the lens extends in translation in the Y direction, on a dimension at least equal to the width of the screen. liquid crystal 12, for example of the order of 30 millimeters, so as to illuminate the entire width of the liquid crystal screen 12. [0013] The reflective surface 32 is arranged in the bent portion of the housing 29c, and is oriented to reflect the light emitted by the LEDs 16 towards the liquid crystal screen 12. In this embodiment, the reflective surface 32 is flat. It forms an angle α greater than 0 ° and less than 90 °, such as an angle between 20 ° and 60 °, with the main direction P of a light corridor 29b of the housing 29, located downstream of the portion bent 29c in the direction of propagation of the light beam. In the example shown, the reflecting surface 32 is inclined by 45 °. The reflecting surface 32 may be that of a separate member of the housing 29 or may be formed by an inner surface of the bent portion 29c of the housing 29, thereby reducing the number of parts and thus the cost of the generating device. images. In addition, the assembly is facilitated. In the example shown, the reflective surface 32 forms the bent portion 29c of the housing 29 and connects the first light corridor 29a to the second perpendicular light corridor 29b. The liquid crystal screen 12 may be inclined in the image generation device 10. It forms an angle, for example between 0 ° and 40 °, with the main direction P of the second light corridor 28b of the housing 28. [0014] The inclined screen 12 makes it possible to avoid glare of the conductor by the light rays of the sun by reflection in the mirror 126 of the display 100.
权利要求:
Claims (10) [0001] REVENDICATIONS1. An image generating device (10) for a motor vehicle head-up display (100) comprising a liquid crystal display (12) and a backlighting device (14), said backlighting device (14) comprising at least one light-emitting diode (16), a housing (28; 29) surrounding the space between the at least one light-emitting diode (16) and the liquid crystal screen (12), characterized in that said housing ( 28; 29) is bent, the image generation device (10) further comprising a reflective surface (31; 32) arranged in a bend portion (28c; 29c) of the housing (28; 29) and oriented to reflecting the light emitted by the at least one light-emitting diode (16) towards the screen (12). [0002] 2. Image generating device (10) according to the preceding claim, characterized in that the reflecting surface (31) is concave. [0003] An image generating device (10) according to one of the preceding claims, characterized in that the reflecting surface (31) is defined by the sum of the equation of a conic and a series of polynomials. [0004] An image generating device (10) according to claim 1, characterized in that the reflecting surface (32) is an inclined plane surface. [0005] 5. An image generating device (10) according to one of the preceding claims, characterized in that it comprises a support (26) fixed to the housing (28), the reflecting surface (31) being formed by a metal coating deposited on the support (26). [0006] 6. Image generating device (10) according to the preceding claim, characterized in that the support (26) is obtained by plastic injection. [0007] An image generating device (10) according to one of claims 1 to 5, characterized in that the reflecting surface (31; 32) is formed by an inner surface of the bent portion (28c; 29c) of the housing (28; 29). [0008] 8. An image generating device (10) according to one of the preceding claims, characterized in that the reflecting surface (31) is a mirror surface. 3030065 11 [0009] An image generating device (10) according to one of the preceding claims, characterized in that the bend of the housing (28; 29) forms an angle of between 30 and 120 °. [0010] Head-up display (100), characterized in that it comprises an image generation device (10) according to one of the preceding claims.
类似技术:
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同族专利:
公开号 | 公开日 CN107466377A|2017-12-12| JP2018514796A|2018-06-07| WO2016092221A1|2016-06-16| CN107107760A|2017-08-29| US20170341593A1|2017-11-30| CN107107760B|2020-04-03| WO2016091931A1|2016-06-16| US20170343856A1|2017-11-30| DE102014118380A1|2016-06-16| FR3030065B1|2019-08-16| US10065572B2|2018-09-04| EP3230111A1|2017-10-18| EP3230111B1|2018-12-05|
引用文献:
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2016-07-29| PLFP| Fee payment|Year of fee payment: 2 | 2017-07-31| PLFP| Fee payment|Year of fee payment: 3 | 2017-10-27| PLSC| Search report ready|Effective date: 20171027 | 2018-07-27| PLFP| Fee payment|Year of fee payment: 4 | 2019-07-31| PLFP| Fee payment|Year of fee payment: 5 | 2020-07-31| PLFP| Fee payment|Year of fee payment: 6 | 2021-07-29| PLFP| Fee payment|Year of fee payment: 7 |
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申请号 | 申请日 | 专利标题 DE102014118380.0A|DE102014118380A1|2014-12-11|2014-12-11|Display device for a motor vehicle with force sensor, motor vehicle and method| DEDE102014118380.0|2014-12-11|US15/534,398| US20170343856A1|2014-12-11|2015-12-10|Device for generating images and head-up display of automotive vehicle| JP2017531310A| JP2018514796A|2014-12-11|2015-12-10|Image generating device and automotive head-up display| EP15817998.6A| EP3230112A1|2014-12-11|2015-12-10|Device for generating images and head-up display of automotive vehicle| PCT/FR2015/053423| WO2016092221A1|2014-12-11|2015-12-10|Device for generating images and head-up display of automotive vehicle| CN201580066764.3A| CN107466377A|2014-12-11|2015-12-10|For the device for the head-up display for generating image and motor vehicles| 相关专利
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