JP2014028593A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact display device for a vehicle having functions of a plurality of display devices.SOLUTION: A display device for a vehicle includes: an image display element for modulating light emitted from a light source; a projection part 200 for projecting, in a direction of projection axis, first image display light modulated in a first zone of the image display element and second image display light modulated in a second zone of the image display element; a first screen 360 for reflecting the first image display light projected by the projection part 200; a combiner 400 for presenting, as a virtual image 450, the first image display light reflected by the first screen 360; a second screen 366 for projecting the second image display light projected by the projection part 200; a second screen 366 for projecting the image display light projected by the projection part 200; and an optical path-length adjustment plate that is disposed at a position corresponding to the second region of the image display element.

Description

  The present invention relates to a vehicle display device.

  A vehicle display device called a head-up display is known. The head-up display transmits information that enters from outside the vehicle and displays information by superimposing it on the scenery outside the vehicle using an optical element called a combiner that reflects the image projected from the optical unit arranged inside the vehicle. It is a display device. A head-up display has recently been attracting attention as a display device for vehicles because a driver who is viewing the scenery outside the vehicle can recognize information on the image projected from the optical unit with almost no change in line of sight or focus. Collecting.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses that a visible space is adjusted by using an X-axis stage, a Z-axis stage, and a rotary stage in a head-up display mounted on a dashboard of a vehicle.

Japanese Patent Laid-Open No. 10-278629

  In addition to a head-up display, a display device necessary for vehicle operation, such as a speedometer and a fuel meter, a display device related to a navigation system or an AV system may be provided as a display device for a vehicle. It is desirable that the plurality of display devices can be reduced in size and can be provided at a lower cost.

  This invention is made | formed in view of such a condition, The objective is to provide the small display apparatus for vehicles which has the function of a some display apparatus.

  In order to solve the above-described problems, a vehicle display device according to an aspect of the present invention includes an image display element that modulates light emitted from a light source, and first image display light that is modulated by a first region of the image display element. And a projection unit that projects the second image display light modulated by the second region different from the first region of the image display element in the projection axis direction, and reflects the first image display light projected by the projection unit. A first screen; a combiner that presents the first image display light reflected by the first screen as a virtual image; a second screen that displays the second image display light projected by the projection unit; and a second region of the image display element. And an optical path length adjusting plate provided at a position corresponding to.

  ADVANTAGE OF THE INVENTION According to this invention, the small display apparatus for vehicles which has the function of a some display apparatus can be provided.

1 is an external view of a vehicle display device according to an embodiment of the present invention. It is a side view which shows the internal structure of the display apparatus for vehicles. It is a top view of the display apparatus for vehicles of FIG. It is a figure which shows the internal structure of an optical unit with the path | route of light. It is a figure which shows the 1st area | region and 2nd area | region of an image display element. It is a figure which shows arrangement | positioning of an optical path length adjustment board and an image display element. It is an external view of the light reduction plate seen from the optical axis direction. It is a side view which shows the positional relationship of a light reduction board and a fly eye lens. It is a figure which shows the function structure of the control part of the display apparatus for vehicles. It is a figure which shows the function structure of the image process part of FIG. It is a figure which shows the image projected as 1st image display light. It is a figure which shows the image projected as 2nd image display light. It is a figure which shows the synthesized image which an image composition part synthesize | combines. It is a figure which shows the internal structure of the optical unit of the display apparatus for vehicles which concerns on a modification.

  Embodiments of the present invention will be described below with reference to the drawings. Specific numerical values and the like shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  As a vehicle display device according to this embodiment, a head-up display that is installed and used inside a dashboard of a vehicle will be described. This vehicle display device presents the upper half of image display light projected from one projection unit as a virtual image via a combiner, and the lower half of the image display light projected from the projection unit as a real image via a screen. Present. As a result, one display device for a vehicle can serve as both a display function as a head-up display and a display function as a normal display, and the device can be reduced in size and cost.

[Vehicle Display Device According to Embodiment]
FIG. 1 is an external view of a vehicle display device according to an embodiment of the present invention. The user who is a driver recognizes the upper half of the projected image display light as a virtual image 450 of the letter “A” via the combiner 400. The user sees the combiner 400 with respect to the line-of-sight direction, and recognizes that the virtual image 450 of the letter “A” is displayed as 1.7 m to 2.0 m ahead (front of the vehicle) from the user. Further, the user recognizes the lower half of the projected image display light as a real image 460 of the letter “B” via the back-illuminated screen 366.

  In the following description, the directions indicated by front, rear, left, right and up and down are based on the user's eyes as a driver, respectively, forward, backward, left side direction, right side direction of the vehicle, It means a direction perpendicular to the road surface on which the vehicle is disposed and a direction from the surface to the vehicle side and the opposite direction.

2 is a side view showing the internal configuration of the vehicle display device 10, and FIG. 3 is a top view of the vehicle display device 10 of FIG.
The vehicular display device 10 presents, as a virtual image 450, the projection unit 200, the intermediate image screen 360 that reflects the upper half of the image display light projected from the projection unit 200, and the image display light that is reflected by the intermediate image screen 360. The combiner 400 includes a back-illuminated screen 366 that presents the lower half of the image display light projected from the projection unit 200 as a real image.

  The projection unit 200 includes a circuit board that generates an image signal of image display light projected by the projection unit 200, and an optical unit 210 that projects image display light using the image signal generated by the circuit board. The optical unit 210 houses a light source, an image display element, various optical lenses, and the like which will be described later. In the present embodiment, a case where LCOS (Liquid crystal on silicon), which is a reflection type liquid crystal display panel, is used as the image display element 240 is illustrated, but a DMD (Digital Micromirror Device) may be used as the image display element 240. In that case, the optical system and the driving circuit according to the display element to be applied are used. Further, a laser display device using MEMS (Micro Electro Mechanical Systems) or the like may be used.

  The intermediate image screen 360 is provided apart from the projection port 201 in the direction of the projection axis 320 of the image display light projected from the projection unit 200. A part of the image display light projected from the projection unit 200 is formed as a real image on the intermediate image screen 360, and the image display light related to the real image formed on the intermediate image screen 360 is reflected by the intermediate image screen 360. The light is projected onto a combiner 400 provided in a space between the windshield 610 and the dashboard 620.

  The back-illuminated screen 366 is provided away from the projection port 201 in the direction of the projection axis 320 of the image display light projected from the projection unit 200. At this time, in order to form a real image having a larger magnification than the real image formed on the intermediate image screen 360 on the back-illuminated screen 366, the real image is arranged at a distance from the projection port 201 as compared with the intermediate image screen 360. Is done. That is, with respect to the direction of the projection axis 320 of the image display light, the back-illuminated screen 366 is provided at a position that is farther from the projection port 201 than the intermediate image screen 360.

  FIG. 4 is a diagram showing an internal configuration of the optical unit 210 together with a light path. The optical unit 210 includes a light source 231, a collimating lens 232, a UV-IR (UltraViolet-Infrared Ray) cut filter 233, a polarizer 234, a light reducing plate 250, a fly-eye lens 235, a reflecting mirror 236, a field lens 237, and a wire grid polarized beam. A splitter 238, a quarter wavelength plate 239, an optical path length adjusting plate 270, an image display element 240, an analyzer 241, a projection lens group 242, and a heat sink 243 are provided.

  The light source 231 includes a light emitting diode that emits light of three colors of white, blue, green, and red. The light source 231 is attached with a heat sink 243 for radiating heat generated with light emission. The light emitted from the light source 231 is converted into substantially parallel light by the collimator lens 232. The UV-IR cut filter 233 absorbs and removes ultraviolet light and infrared light from the parallel light that has passed through the collimating lens 232. The polarizer 234 changes the light that has passed through the UV-IR cut filter 233 into unpolarized P-polarized light. The light reducing plate 250 adjusts the intensity of the light that has passed through the polarizer 234. Details of the light reduction plate 250 will be described later. The fly-eye lens 235 uniformly adjusts the brightness of the light that has passed through the light reducing plate 250.

  The reflecting mirror 236 changes the optical path of light that has passed through each cell of the fly-eye lens 235 by 90 degrees. The light reflected by the reflecting mirror 236 is collected by the field lens 237. The light condensed by the field lens 237 enters the wire grid polarization beam splitter 238 that transmits P-polarized light and the quarter-wave plate 239 in this order. Part of the light transmitted through the quarter wavelength plate 239 is irradiated to the image display element 240, and the other part of the light is irradiated to the image display element 240 via the optical path length adjusting plate 270. Details of the optical path length adjusting plate 270 will be described later.

  The image display element 240 includes red, green, and blue color filters for each pixel. The light emitted to the image display element 240 has a color corresponding to each pixel, is modulated by the liquid crystal composition included in the image display element 240, and becomes S-polarized image display light, which is applied to the wire grid polarization beam splitter 238. It is emitted toward. The emitted S-polarized light is reflected by the wire grid polarization beam splitter 238, changes the optical path, passes through the analyzer 241, and then enters the projection lens group 242. The image display light transmitted through the projection lens group 242 is projected from the projection port 201 of the projection unit 200.

  FIG. 5 is a diagram showing the first region 271 and the second region 272 of the image display element 240. The first region 271 of the image display element 240 modulates the light emitted from the light source 231 as the first image display light corresponding to a part of the image display light projected from the projection unit 200. The first image display light modulated by the first region 271 is presented as a virtual image via the intermediate image screen 360 and the combiner 400 shown in FIG.

  On the other hand, the second region 272 of the image display element 240 is emitted from the light source 231 as second image display light corresponding to a portion different from the first image display light in the image display light projected from the projection unit 200. Modulate light. The second image display light modulated in the second region 272 is presented as a real image via the back illuminated screen 366 of FIG.

  The first area 271 and the second area 272 of the image display element 240 are areas where the surface of the image display element 240 is virtually divided. Therefore, the physical configuration of each pixel of the image display element 240 that modulates incident light may be the same between the inside and the outside of the first region 271 and the second region 272, and needs to have a physically different configuration. There is no.

  The first image display light and the second image display light modulated by the image display element 240 are projected by a common projection lens group 242. At this time, since the first image display light and the second image display light pass through the same optical path, the position where the real image is formed is the same position in the direction of the projection axis 320. However, the position of the intermediate image screen 360 where the first image display light forms an image and the position of the back-illuminated screen 366 where the second image display light forms an image are different in the direction of the projection axis 320. When trying to form an image on one screen, the image on the other screen is blurred. Therefore, even when the common projection lens group 242 is used, the image display light is imaged on both the intermediate image screen 360 and the back-illuminated screen 366 provided at different positions in the direction of the projection axis 320. A length adjusting plate 270 is used.

FIG. 6 is a diagram showing the positional relationship between the optical path length adjusting plate 270 and the image display element 240. The optical path length adjusting plate 270 is made of a transparent material having a predetermined refractive index n, and has a thickness d in the optical axis direction of light incident on the image display element 240. The optical path length adjusting plate 270 covers the second region 272 of the image display element 240, has an area that does not cover the first region 271, and is provided to face the surface of the image display element 240. . Therefore, the light I ₁₁ incident on the first region 271 and the light I ₁₂ reflected by the first region 271 do not pass through the optical path length adjusting plate 270. On the other hand, the light I ₂₁ incident on the second region 272 and the light I ₂₂ reflected by the second region 272 pass through the optical path length adjusting plate 270. Thereby, the air equivalent length of the second image display light modulated by the second region 272 is set to ((1 / n ₀ ) − (1 / n) with respect to the first image display light modulated by the first region 271. )) It can be shortened by d. N ₀ is the refractive index of air.

  The second image display light transmitted through the optical path length adjusting plate 270 uses a common projection lens group 242 because the air conversion length until it enters the projection lens group 242 is shorter than that of the first image display light. Even so, the distance between the projection port 201 and the imaging position becomes longer with respect to the first image display light. The values of the refractive index n and thickness d of the transparent material used for the optical path length adjusting plate 270 are set to appropriate values according to the magnification of the projection lens group 242 and the positional relationship between the intermediate image screen 360 and the back-illuminated screen 366. Thus, the first image display light and the second image display light can be imaged at different positions. Thus, clear image display light can be formed on the intermediate image screen 360 and the back-illuminated screen 366 provided at different positions in the direction of the projection axis 320 by using the common projection lens group 242. .

  Returning to FIG. 4, the light reduction plate 250 will be described. The light reducing plate 250 has a transparent region 252 and a light reducing region 254, and can be moved in the X direction by a driving mechanism (not shown). By moving the light reducing plate 250 in the X direction, the region through which the light emitted from the light source 231 is transmitted is switched between the transparent region 252 and the light reducing region 254. FIG. 4 shows a state in which the light reducing plate 250 is disposed at a position where the light emitted from the light source 231 passes through the transparent region 252. At this time, the light emitted from the light source 231 is attenuated by the light reducing plate 250. Not. On the other hand, when the light reducing plate 250 is moved in the X direction in FIG. 4 and the light emitted from the light source 231 is switched to an arrangement that transmits the light reducing region 254, the light is attenuated by the light reducing plate 250.

  FIG. 7 is an external view of the dimming plate 250 viewed from the optical axis direction. The dimming region 254 is provided with alternating dimming portions 256 for dimming incident light and transparent portions 258 for not dimming. The dimming unit 256 includes an ND (Neutral Density) filter that attenuates the intensity of incident light at a predetermined rate.

  FIG. 8 is a side view showing the positional relationship between the light reducing plate 250 and the fly-eye lens 235. FIG. 8 shows an arrangement in which light emitted from the light source 231 passes through the dimming region 254. The dimming region 254 of the dimming plate 250 is provided with the dimming unit 256 and the transparent unit 258 so that the pair of the dimming unit 256 and the transparent unit 258 correspond to one cell of the fly-eye lens 235. The dimming plate 250 is close to the surface of the fly-eye lens 235 so that the upper half of each cell of the fly-eye lens 235 corresponds to the dimming portion 256 and the lower half corresponds to the transparent portion 258. So as to face each other.

With the configuration of FIG. 8, the light I ₁₃ incident on the upper half region of each cell of the fly-eye lens 235 is attenuated by the light-reducing unit 256 of the light-reducing region 254, enters the fly-eye lens 235, and the light I ₁₄ is emitted. On the other hand, the light I23 entering the region of the lower half each cell of the fly-eye lens 235 is incident on the fly-eye lens 235 without being dimmed for transmitting the transparent portion 258 of the dimming area 254, emitted as light I ₂₄ Is done. Thereafter, the dimmed light I ₁₄ is incident on the first region 271 of the image display element 240 via the field lens 237 of FIG. 4, and the undimmed light I ₂₄ is the second region 272 of the image display element 240. Is incident on. Similarly, the light incident on the other cells of the fly-eye lens 235 is also dimmed in the upper half and not dimmed in the lower half. For this reason, the intensity of the light incident on the first region 271 can be reduced with respect to the light incident on the second region 272. As a result, the illuminance of the first image display light modulated and projected by the first region 271 can be lowered with respect to the second image display light modulated and projected by the second region 272. Thereby, the illuminance adjustment of the first image display light projected without changing the gradation ratio of the image display element 240 can be performed, and compared with the case where the illuminance adjustment is performed using the image display element 240, the higher order. Tone first image display light can be projected.

  FIG. 9 is a block diagram illustrating a configuration of the control unit 1000. The control unit 1000 includes an image generation unit 1100 and an image display unit 1200 and performs control related to a display image presented by the vehicle display device 10. The control unit 1000 will be described as a functional block realized by a circuit board provided in the projection unit 200.

  Hereinafter, each block shown in the block diagram of the present specification can be realized in hardware by an element such as a CPU of a computer or a mechanical device, and in software by a computer program or the like. Then, the functional block realized by those cooperation is drawn. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by a combination of hardware and software.

  The image generation unit 1100 receives an image signal output from an external device 1600 such as a navigation system or a smartphone, and generates an image signal of a display image presented by the vehicle display device 10. Further, the image generation unit 1100 acquires an operation signal from the operation device 1400 such as a remote controller and vehicle information from the in-vehicle sensor group 1500 and controls an image signal to be generated.

  The image display unit 1200 receives the image signal and the control signal output from the image generation unit 1100, and drives a light source, an image display element, a driving mechanism that moves the dimming plate, and the like included in the optical unit 210. The image display unit 1200 also acquires detection information from the optical unit sensor group 1300 provided in the projection unit 200 and controls image display light to be projected on the projection unit 200.

  The image generation unit 1100 acquires an image processing unit 1140 that generates an image using an input signal from the external device 1600, an operation reception unit 1170 that receives an operation from a user, and information that acquires vehicle information from the in-vehicle sensor group 1500. An acquisition unit 1180 and an image control unit 1110 that controls processing of the image processing unit 1140 are included.

  The information acquisition unit 1180 acquires vehicle information from the in-vehicle sensor group 1500 and transmits the acquired vehicle information to the image control unit 1110. Specific examples of vehicle information acquired from the in-vehicle sensor group 1500 include vehicle speed information, steering angle information, GPS signals, parking brake state information, fuel information, and the like.

  The operation reception unit 1170 receives an operation signal from an operation device 1400 such as a remote controller, and transmits the received signal to the image control unit 1110. Note that an operation button (not shown) may be provided in the control unit 1000 as a device for operation input by the user, and an operation signal from the operation button may be received.

  The image control unit 1110 transmits a control signal to the image processing unit 1140 and the image display unit 1200 based on signals acquired from the operation reception unit 1170 and the information acquisition unit 1180. For example, when the operation reception unit 1170 receives an input operation from the user, the image control unit 1110 instructs the image processing unit 1140 to generate an image signal corresponding to the content of the input operation from the user. Further, the image control unit 1110 instructs the image display unit 1200 to adjust illuminance, color, and contrast in accordance with an input operation from the user.

  FIG. 10 is a block diagram illustrating a functional configuration of the image processing unit 1140. The image processing unit 1140 includes a first image generation unit 1150, a second image generation unit 1152, and an image composition unit 1154.

  The first image generation unit 1150 generates an image signal of an image projected on the combiner 400 as the first image display light. FIG. 11 is a diagram showing a first image 710 projected as the first image display light. Since the image projected as the first image display light is an image superimposed on the scenery outside the vehicle, the first image generation unit 1150 can easily recognize the image signal of the first image 710 that is simple and has high contrast. Is generated. The first image generation unit 1150 transmits the generated image signal to the image synthesis unit 1154.

  Note that the first image generation unit 1150 may generate an image signal of the first image display light based on an image signal acquired from an external device 1600 such as a navigation system. Further, an image signal of an operation image called an on-screen display may be generated based on an instruction from the image control unit 1110.

  The second image generation unit 1152 generates an image signal of an image projected on the back-illuminated screen 366 as the second image display light. FIG. 12 is a diagram illustrating a second image 720 projected as the second image display light. The image projected as the second image display light is, for example, an image indicating vehicle information necessary for vehicle operation such as a speedometer and a fuel gauge, and the second image generation unit 1152 includes an in-vehicle sensor group. Based on the information acquired from 1500, the image signal of the 2nd image 720 which shows various vehicle information is generated. The second image generation unit 1152 transmits the generated image signal to the image synthesis unit 1154.

  The image composition unit 1154 acquires the image signal generated by the first image generation unit 1150 and the image signal generated by the second image generation unit 1152, and generates an image signal of a composite image obtained by combining both. FIG. 13 is a diagram showing a synthesized image 730 synthesized by the image synthesis unit 1154. The composite image 730 is arranged such that the first image 710 generated by the first image generation unit 1150 is positioned in the upper half and the second image 720 generated by the second image generation unit 1152 is positioned in the lower half. By synthesizing the composite image having such an arrangement, the first image display light modulated by the first region 271 of the image display element 240 shown in FIG. The second image display light modulated by the two regions 272 can correspond to the second image 720. Note that a predetermined gap may be provided between the first image 710 and the second image 720 corresponding to the gap between the first area 271 and the second area 272 shown in FIG. The image composition unit 1154 transmits an image signal of the generated composite image to the image display unit 1200.

  Returning to FIG. 9, the image display unit 1200 includes a drive unit 1270 that drives elements included in the optical unit 210, a display adjustment unit 1240 that adjusts image signals acquired from the image generation unit 1100, and display control that controls them. Part 1210.

  The display adjustment unit 1240 acquires an image signal from the image processing unit 1140 based on an instruction from the display control unit 1210, and adjusts the image brightness of the acquired image signal. The display adjustment unit 1240 transmits a control signal to the drive unit 1270 based on the image signal whose brightness has been adjusted.

  The display control unit 1210 controls the display adjustment unit 1240 and the drive unit 1270 based on instructions acquired from the image generation unit 1100 and information acquired from the optical unit sensor group 1300. The optical unit sensor group 1300 includes an illuminance sensor 1310 that detects the brightness around the combiner 400 and a temperature sensor 1350 that detects the temperature of the light source 231.

  For example, the display control unit 1210 instructs the display adjustment unit 1240 to adjust the brightness based on the illuminance detected by the illuminance sensor 1310. When the illuminance of outside light is high on a clear day, the display adjustment unit 1240 is instructed to increase the brightness of the image display light projected by the projection unit 200 in order to increase the visibility of the user.

  The driving unit 1270 drives a driving mechanism for moving the light source 231, the image display element 240, and the dimming plate 250 included in the optical unit 210 based on control signals acquired from the display control unit 1210 and the display adjustment unit 1240. Let

  The drive unit 1270 acquires the image signal of the composite image 730 illustrated in FIG. 13 from the display adjustment unit 1240, and drives the image display element 240 using the image signal. At this time, in the composite image 730 of FIG. 13, the first image 710 is arranged at a position corresponding to the first area 271 of the image display element 240, and the second image is located at a position corresponding to the second area 272 of the image display element 240. 720 is arranged. Therefore, the driving unit 1270 modulates the first image display light corresponding to the first image 710 by the first region 271 of the image display element 240 and corresponds to the second image 720 by the second region 272 of the image display element 240. The image display element 240 is driven so as to modulate the second image display light.

  Further, the drive unit 1270 adjusts the output of the light source and adjusts the control signal to the image display element 240 based on the brightness adjustment instruction from the display control unit 1210. Furthermore, when the illuminance of external light is low during rainy weather or at night, the drive mechanism that moves the light reducing plate 250 in FIG. 4 is driven so that the user does not feel the first image display light dazzling, and the first image display light is supported. Diminish the light to be. Thereby, compared with the illumination intensity of 2nd image display light, the illumination intensity of 1st image display light can be reduced.

  By having the above configuration, the vehicular display device 10 presents the first image 710 shown in FIG. 11 as a head-up display by the first image display light projected from the projection unit 200 and projects from the projection unit 200. The second image shown in FIG. 12 can be presented as a normal display by the second image display light. Since the first image display light and the second image display light share the same optical unit 210, the size and cost of the device can be greatly reduced compared to the case where separate display devices are provided. Can do.

[Vehicle Display Device According to Modification]
Next, a vehicle display device according to a modification will be described. The vehicle display device according to the modification includes an optical unit 212 instead of the optical unit 210 shown in FIG. Since other configurations are common, different points will be mainly described.

  FIG. 14 is a diagram showing an internal configuration of the optical unit 212 of the vehicle display device according to the modification. The optical unit 212 is provided with laser light sources 230 (R, G, B) instead of the light source 231. The laser light source 230 (R, G, B) is, for example, a semiconductor laser diode, and emits red, green, and blue laser beams, respectively. Each of the laser light sources 230 (R, G, B) is provided with a heat sink 243 for heat dissipation. Laser light emitted from the laser light source 230 (R, G, B) is reflected by the dichroic mirror 229, changes its optical path, and is incident on the collimating lens 232 as white laser light having the same optical axis.

  In the optical unit 212, the optical path length adjusting plate shown in FIG. 4 is not provided between the wave plate 239 and the image display element 240. Since the laser light source is a light source close to a point light source, the light emitted from the laser light source 230 can be incident on the image display element 240 as light having a large F value. Image display light modulated by the image display element 240 and projected via the projection lens group 242 forms an image having a large F value and a deep depth of field. Therefore, even if the optical path length adjusting plate 270 shown in FIG. 4 is not used, the intermediate image screen 360 and the back-illuminated screen 366 having different distances in the direction of the projection axis 320 from the projection port are respectively provided with the first image display light and The second image display light can be imaged. If the positions of the intermediate image screen 360 and the back-illuminated screen 366 in the direction of the projection axis 320 are significantly different from each other and do not fall within the range of the depth of field of the image display light, the optical path length adjusting plate is the same as in FIG. The image forming position may be adjusted by providing 270.

  In the above-described embodiment, the case where an image indicating vehicle information necessary for vehicle operation such as a speedometer and a fuel gauge is projected onto the back-illuminated screen 366 as the second image display light has been described. Not limited to. In addition, the second image display light may be used for display of a navigation system or an AV system. In that case, the back-illuminated screen 366 may be positioned at the center of the dashboard instead of the position in front of the steering wheel as viewed from the driver.

  Moreover, in the above-mentioned embodiment, although the case where the projection part 200 was provided in a dashboard was demonstrated, the installation place of the projection part 200 is not restricted to this. For example, the projection unit 200 may be attached to a rearview mirror, and the first image display light may be projected onto a combiner provided at a position on the driver's seat side next to the rearview mirror. In this case, a back-illuminated screen for projecting the second image display light may be provided at a position on the passenger seat side next to the room mirror, and used as a display device that presents an image to a passenger sitting in the passenger seat or the rear seat.

  DESCRIPTION OF SYMBOLS 10 Display apparatus for vehicles, 200 Projection part, 201 Projection port, 230 Laser light source, 231 Light source, 240 Image display element, 250 Light reduction plate, 270 Optical path length adjustment plate, 271 1st area | region, 272 2nd area | region, 360 Intermediate image screen 366, back-illuminated screen, 400 combiner, 450 virtual image, 710 first image, 720 second image.

Claims (3)

An image display element that modulates light emitted from the light source;
The first image display light modulated by the first area of the image display element and the second image display light modulated by a second area different from the first area of the image display element are projected in the projection axis direction. A projection unit to perform,
A first screen that reflects the first image display light;
A combiner for presenting the first image display light reflected by the first screen as a virtual image;
A second screen that forms the second image display light as a real image;
An optical path length adjusting plate provided at a position corresponding to the second region of the image display element;
A vehicle display device comprising:   The vehicle display device according to claim 1, further comprising a dimming plate that adjusts an intensity of light modulated in the first region between the light source and the image display element. An image display element that modulates light emitted from the laser light source;
The first image display light modulated by the first region of the image display element and the second image display light modulated by a second region different from the first region of the image display element are projected in the projection axis direction. A projection unit;
A first screen that reflects the first image display light;
A combiner for presenting the first image display light reflected by the first screen as a virtual image;
A second screen that forms the second image display light as a real image;
A dimming plate for adjusting the intensity of light modulated in the first region between the light source and the image display element;
A vehicle display device comprising:

Images