JP2021183998A - Vehicular display device - Google Patents

Abstract

To provide a vehicular display device that can display an image for a whole area of an area seen from a vehicle thereby suppressing movement of a visual line of a driver to contribute to safe travelling.SOLUTION: A vehicular display device is an HUD device 1 that comprises: an image display unit 2 for displaying an image on an image display surface; and an optical system 3 projecting image light of the displayed image to a windshield WS of a vehicle, and that enables visual recognition of a virtual image of the image by light reflected by the windshield WS, the image display unit 2 comprises a plurality of image display surfaces (liquid crystal panels) 23 that are each inclined with different angles for an optical axis Lx3 (Lx2) of the optical system 3, and the image is displayed on the plurality of image display surfaces 23. Each image of the plurality of image display surfaces 23 is displayed for a wide area of the windshield WS.SELECTED DRAWING: Figure 3

Description

The present invention relates to a display device mounted on a vehicle such as an automobile, and more particularly to a head-up display device (hereinafter referred to as a HUD device).

As a HUD device, a device has been proposed in which light constituting an image is projected on the windshield of an automobile so that a occupant such as a driver can visually recognize a virtual image of the image by the reflected light. It should be noted that making the virtual image visible thereafter is also referred to as displaying an image. The HUD device has been proposed in which an image is displayed so as to overlap the road in front of the occupant, which is visually recognized through the windshield.

For example, Patent Document 1 includes two image display units and a half mirror, and the half mirror reflects the image light of one image display unit and transmits the image light of the other image display unit. , One of the two images displayed on these image display units is displayed in a substantially horizontal direction so as to overlap the road ahead.

Further, in Patent Document 2, an optical element made of a light guide is arranged on the display surface of the image display unit, and the emission surface that emits image light from the optical element is inclined so that the display surface of the image display unit can be used. The emitted image light is refracted, and a part of the image is displayed almost horizontally so as to overlap the road ahead.

As described above, in the techniques of Patent Documents 1 and 2, the image displayed in the horizontal direction is displayed so as to overlap the road in front of the occupant, so that the line of sight does not move significantly from the road in front of the occupant. However, the displayed image can be recognized, which is effective in ensuring safe driving of the vehicle.

JP-A-2018-173589A JP-A-2019-95690

The techniques of Patent Documents 1 and 2 are techniques for displaying an image in the horizontal direction so as to correspond to the road ahead, but areas other than the road ahead, such as a sidewalk, a building on the side of the road, and an upper sign. It has not been proposed to display an image corresponding to the above. Therefore, when the occupant's line of sight is directed to an area other than the road ahead, it is necessary to move the line of sight in order to recognize the displayed image, which is not always sufficient in terms of safe driving.

An object of the present invention is to enable the image to be displayed over almost the entire area seen from the vehicle, thereby suppressing the movement of the line of sight when the occupant visually recognizes the image and contributing to safe driving. A vehicle display device including a HUD device is provided.

The present invention includes an image display unit for displaying an image on an image display surface, and an optical system for projecting the image light of the displayed image onto the windshield of the vehicle, and the image is reflected by the light reflected by the windshield. The image display unit is a vehicle display device capable of visually recognizing a virtual image of the above, and the image display unit includes a plurality of image display surfaces inclined at different angles with respect to the optical axis of the optical system, and these plurality of image display surfaces. The feature is that the image is displayed on.

In the present invention, the plurality of image display surfaces correspond to the plurality of display areas partitioned by the windshield, and the virtual image of the image displayed on each image display surface is visually recognized in the corresponding area. For example, the plurality of display areas are four display areas corresponding to the upper, lower, left, and right areas in front of the vehicle, which are visually recognized by the occupant through the windshield.

In a preferred embodiment of the present invention, the image display unit includes a plurality of display panels each having an image display surface, and these display panels are configured to have a prismatic shape or a prismatic shape. This display panel is preferably composed of a liquid crystal panel or an organic EL. Further, in another preferred embodiment of the present invention, the image display unit includes a light source, a DMD that selectively reflects the light of the light source to form an optical pattern, and a screen on which an image formed by the DMD is projected. The screen is formed in a weight shape or a weight cylinder shape with the optical axis as the central axis, and the weight surface is configured as an image display surface. This screen may be formed in the shape of a prism or a cylinder, and a plurality of weight surfaces may be configured as image display surfaces.

Further, in the present invention, a display control means for controlling the image display on the image display unit may be provided. This display control means can independently control a plurality of image display surfaces. In this case, the display control means may be provided with means for detecting an object existing in front of the vehicle, and may be configured to display an image corresponding to the detected object.

According to the present invention, a plurality of image display surfaces tilted at different angles with respect to the optical axis of the optical system are provided, images are displayed on the plurality of image display surfaces, and each of the displayed images is a windshield. It is displayed in a plurality of display areas partitioned by. As a result, an image is displayed over a wide area of the windshield, and a vehicle display device including a HUD device capable of suppressing the movement of the line of sight when the occupant visually recognizes the image and contributing to safe driving is provided. Will be done.

The conceptual block diagram of the HUD apparatus of Embodiment 1. FIG. The schematic diagram explaining the display area in a windshield. The block diagram of the HUD apparatus of Embodiment 1 which a part is shown in the cross section. Schematic perspective view of a part of the main part of the first embodiment The schematic diagram which shows the form of an image display. The schematic sectional view of the image display part of Embodiment 2. The schematic perspective view which disassembled a part of the main part of Embodiment 2. The perspective view which disassembled a part of the modification 1 of Embodiment 2. Sectional drawing of the modification 2 of Embodiment 2. Sectional drawing of the modification 3 of Embodiment 2. The schematic sectional view of the image display part of Embodiment 3. The schematic perspective view of the main part of Embodiment 3. The schematic perspective view of the main part of the modification of Embodiment 3.

(Embodiment 1)
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual configuration diagram of the HUD device 1 of the first embodiment applied to an automobile. The HUD device 1 is arranged in the dashboard DB of the automobile, and the image light L emitted from the HUD device 1 is projected onto the windshield (referred to as a windshield) WS of the automobile through the upper surface opening Ho of the dashboard. Let me. The projected image light L is reflected by the windshield WS and directed to the occupant M such as the driver of the automobile. When the image light L enters the eyes of the occupant M, the occupant M can visually recognize a virtual image by the image light at a position in front of the automobile through the windshield WS, and the image is displayed.

The HUD device 1 includes an image display unit 2 that displays the generated image on the image display surface, and an optical system 3 that projects the image displayed on the image display surface onto the windshield WS. As shown by the broken line, the image display unit 2 is configured to display an image in each of four different regions A of the windshield WS. That is, FIG. 2A is a diagram schematically showing a front region that is visually recognized by the occupant of the automobile, particularly the driver M, through the windshield WS. Here, the lower display area Ad corresponding to the road ahead of the own lane in the area below the horizon H, the upper display area Au which is the area above the horizon H, and the upper and lower display areas Au, When divided into four display areas, the left display area Al corresponding to the left sidewalk and the right display area Ar corresponding to the oncoming lane road, which are set to the left and right of Ad, each of these four display areas is supported. To display the image.

As shown in FIG. 1, the optical system 3 further reflects the first reflecting unit 31 that reflects the image light of the image displayed in the image display unit and the light reflected by the first reflecting unit 31. A second reflecting unit 32 that projects onto the windshield WS is provided. The first reflecting unit 31 is composed of a convex mirror or a plane mirror, but here, it is composed of a convex mirror 31. The second reflecting portion 32 is composed of a concave mirror, and the concave mirror 32 is composed of a spherical surface or an aspherical surface having a curvature that is a required focal length. Then, by configuring the HUD device 1 so that the image displayed on the image display unit 2 is arranged within the focal length of the concave mirror 32, the occupant M can visually recognize the virtual image of the displayed image. ing.

Here, in the optical system 3, the optical path of light that is sequentially reflected at each center of the convex mirror 31 and the concave mirror 32 and projected onto the windshield WS is defined as the optical axis Lx3 of the optical system. Then, in this optical system 3, when the light along the optical axis Lx3 is reflected by the windshield WS, the direction in which the reflected light is extended toward the front of the windshield WS is substantially the horizontal line when viewed from the occupant. It is set to be oriented in the direction of H.

FIG. 3 is a configuration diagram of the HUD device 1 showing the cross-sectional structure of the image display unit 2. The image display unit 2 includes a casing 20, a backlight 21 built in the casing 20, and a display panel 22. The casing 20 is formed in the shape of a rectangular container having an open front surface and heat dissipation fins 201 on the bottom surface. The backlight 21 is arranged on the inner bottom surface of the casing 20, and the display panel 22 is arranged on the opening side of the backlight 21.

FIG. 4 is a schematic perspective view of a part of the backlight 21 and the display panel 22. Although detailed illustration is omitted, the backlight 21 has a plurality of white LEDs (light emitting diodes) 211 mounted on the surface of the light source substrate in a required arrangement state, and emits white light when power is supplied. Is configured to emit. Further, a milky white diffusion panel 212 is arranged on the light emitting surface side of the white LED 211, and the light emitted from each white LED 211 is emitted as light having uniform brightness. The diffusion panel 212 may be composed of a Fresnel lens that refracts the light of each white LED 211 into a parallel light flux.

The display panel 22 is composed of four liquid crystal panels 23. Each of these four liquid crystal panels 23 has an image display surface inclined at a required angle with respect to the optical axis Lx2, and is assembled into a cylindrical inverted square pyramid shape. That is, when the line passing through the center of the opening of the casing 20 is the optical axis Lx2 of the image display unit 2, the four liquid crystal panels 23 are configured in a square pyramid shape having the optical axis Lx2 as a cylinder axis. Each liquid crystal panel 23 has an image display surface formed in an inverted triangle, and is supported by a liquid crystal holder 24 having an inverted triangular frame shape. The hypotenuses on both sides of each liquid crystal holder 24 are connected to each other, whereby the four liquid crystal panels 23 are formed in an inverted square pyramid shape having vertices on the optical axis Lx2. The four liquid crystal panels 23 are configured as an upper liquid crystal panel 23u, a lower liquid crystal panel 23d, a left side liquid crystal panel 23l, and a right side liquid crystal panel 23r.

As shown in FIG. 3, the image display unit 2 is connected to the display control device 4. The display control device 4 includes an object detection unit 41 and a display control unit 42. An object detection unit 41 is connected to a camera 5 which is arranged above the windshield WS in the vehicle interior of the vehicle shown in FIG. 1 and captures a front region of the vehicle. The object detection unit 41 is capable of detecting an object such as another vehicle, a pedestrian, a building, or a sign from the image captured by the camera 5.

The display control unit 42 independently controls the image display on the four liquid crystal panels 23 (23u, 23d, 23l, 23r). In this image control, for example, it is possible to display a navigation image based on position information from a navigation device (not shown), or to display a speedometer image based on speed information of a speedometer. Further, it is possible to display an image for driving support and an image for warning based on the object detected by the object detection unit 41.

In the HUD device 1 having the above configuration, the display control unit 42 of the display control device 4 displays a required image on the display panel 22. That is, the image is displayed on at least one of the four liquid crystal panels 23. When the white LED 211 emits light and the backlight 21 emits light, the emitted white light is projected onto the back surface of the liquid crystal panel 23, transmitted through the liquid crystal panel 23, and emitted as image light. This image light is reflected by the convex mirror 31 and further reflected by the concave mirror 32 and projected onto the windshield WS. This image light is reflected by the windshield WS, and by entering the eyes of the occupant M as shown in FIG. 1, a virtual image due to the image light can be visually recognized at a position in front of the windshield WS, and the image is displayed. Will be done.

Since the display panel 22 is composed of four liquid crystal panels 23, the virtual image of the image displayed on each liquid crystal panel 22 is visually recognized by displaying the image on each liquid crystal panel 22. Here, in a state where the optical axis Lx2 of the image display unit 2 coincides with the optical axis Lx3 of the optical system 3, the images displayed on the four liquid crystal panels 23 are the windshields shown in FIGS. 1 and 2, respectively. It will be displayed in the four display areas Au, Ad, Al, and Ar constituting the square pyramidal surface in front of the WS. That is, the image of the upper liquid crystal panel 23u is displayed in the upper display area Au, the image of the lower liquid crystal panel 23d is displayed in the lower display area Ad, the image of the left liquid crystal panel 23l is displayed in the left display area Al, and the right side. The image of the right liquid crystal panel 23r is displayed in the display area Ar.

If the image is selectively displayed on any one of the four liquid crystal panels 23 by the control of the display control device 4, the image is displayed in the corresponding display area. If the image is displayed on the two or three liquid crystal panels or all the liquid crystal panels 23, the image is displayed on the two or three or all the display areas A.

As this display form, a navigation image or a speedometer image is displayed on, for example, the lower liquid crystal panel 23d when the vehicle is running. As a result, as shown in FIG. 5A, these images In and Is are displayed in the lower display area Ad of the windshield WS. Further, although not shown, an image related to the own lane information in front may be displayed on the lower liquid crystal panel 23d, and the image is displayed in the lower display area Ad of the windshield WS, and this image is displayed on the windshield. It is displayed superimposed on the own lane road ahead that is visible through the WS.

Further, when an image related to oncoming lane information is displayed on the right side liquid crystal panel 23r, this image is displayed in the right side display area Ar of the windshield WS and superimposed on the oncoming lane road in front which is visually recognized through the Utondo shield WS. Is displayed. Similarly, the image related to the sidewalk information is displayed on the left sidewalk display area Al by the left side liquid crystal panel 23l, and the image related to the guide sign is displayed on the upper side display area Au by the upper liquid crystal panel 23r.

On the other hand, when the object detection unit 41 of the display control device 4 detects the object based on the image captured by the camera 5, the support image or the warning image is displayed in the area where the object exists. In FIG. 5B, the warning mark Ia can be visually recognized as a virtual image in the right side display area Ar so as to overlap with the oncoming vehicle when the oncoming vehicle is detected, and the display is performed. Further, when approaching the preceding vehicle, the warning mark Ia is displayed in the lower display area Ad. When a pedestrian is detected, a warning mark Ia is displayed in the left display area Al so as to overlap with the pedestrian. A warning mark Ia is displayed in the upper display area when the presence guide sign is detected in the front upper part.

In this way, an appropriate image is displayed over a wide area of the front area that the occupant M sees through the windshield WS, and in each of the upper, lower, left, and right display areas A (Au, Ad, Al, Ar) of the area. Therefore, when the occupant is visually recognizing a specific area or an object in front of the vehicle, the occupant visually recognizes the image displayed superimposed on the specific area or the object without moving the line of sight. be able to. As a result, when the occupant is gazing ahead while the vehicle is running, the image can be visually recognized without moving the line of sight in each of the up, down, left, and right directions, which is advantageous in ensuring safe driving of the vehicle. Become.

Further, since the display panel 22 of the image display unit 2 is configured in a square pyramid shape, and each of the four liquid crystal panels 23 configured as the image display surface is inclined at a required angle with respect to the optical axis Lx2, the window. The image displayed in each of the upper, lower, left, and right display areas A of the shield WS is an image inclined at a required angle along the optical axis Lx3 of the optical system 3. That is, each image is displayed as an image constituting each weight surface of a square pyramid having a depth similar to the own lane road, the oncoming lane side road, the sidewalk, etc., which are visually recognized through the windshield WS. As a result, the image can be visually recognized without moving the line of sight of the occupant in the depth direction (front-back direction), which is advantageous in ensuring safe driving of the automobile.

(Embodiment 2)
FIG. 6 is a cross-sectional view of the HUD device 1A of the second embodiment, and FIG. 7 is a schematic perspective view of a part of the display panel 22 thereof. Since the basic configuration of the image display unit 2A is the same as that of the first embodiment, the equivalent parts are designated by the same reference numerals. In the image display unit 2A, the four liquid crystal panels 23 (23u, 23d, 23l, 23r) on the top, bottom, left, and right are each formed in an inverted trapezoidal shape. Further, these liquid crystal panels 23 are supported by four liquid crystal holders 24 whose outer shape is formed in an inverted trapezoidal frame shape. Similar to the first embodiment, the four liquid crystal holders 24 are configured in an inverted quadrangular pyramid shape by connecting the hypotenuses on both sides to each other.

Further, a rectangular opening is formed in the region surrounded by the short bases of each of the four liquid crystal holders 24, and the central liquid crystal panel 23c formed in a rectangular shape is supported in the rectangular opening. As a result, the four liquid crystal panels 23u, 23d, 23l, and 23r on the top, bottom, left, and right are arranged in an inverted quadrangular pyramid shape with the optical axis Lx2 as the axis, and one central side liquid crystal panel 23c is a surface perpendicular to the optical axis Lx2. Arranged on top. The front liquid crystal panel 23c is connected to the display control device 4 together with four liquid crystal panels 23u, 23d, 23l, and 23r on the top, bottom, left, and right, and a required image is displayed.

In the HUD device 1A provided with the image display unit 2A, when an image is displayed on the liquid crystal panel 23, the white light of the backlight 21 passes through each liquid crystal panel 23 and is emitted as image light, respectively, and is emitted by the optical system 3. It is the same as the first embodiment that the virtual image is visually recognized by being projected onto the windshield WS. At this time, since the image display unit 2A includes the central liquid crystal panel 23c, as shown in FIG. 2B, the display in the upper, lower, left, and right display areas Au, Ad, Al, and Ar in the windshield WS can be displayed. In addition, the image displayed on the front liquid crystal panel 23c can be visually recognized in the central region Ac surrounded by these display regions, that is, the display region substantially in the center in the horizontal direction when viewed from the occupant M.

According to the second embodiment, as in the first embodiment, the four liquid crystal panels 23u, 23d, 23l, 23r of the image display unit 2A are tilted at a required angle with respect to the optical axis Lx2, and thus these liquid crystals. The images of the upper, lower, left, and right display areas Au, Ad, Al, and Ar by the panel are displayed as surface images extended in a square pyramid shape with respect to the optical axis Lx3 of the optical system 3. Further, the image of the central display area Ac by the central liquid crystal panel 23c is displayed as a screen image in the vertical direction. As a result, the image can be displayed in almost the entire area of the windshield WS, and when the occupant visually recognizes the front area of the automobile, the occupant can visually recognize the image in each display area A without significantly moving the occupant's line of sight. It can be done and is effective for safe driving.

(Modification 1)
FIG. 8 is a diagram illustrating a modification 1 of the second embodiment, and is a perspective view of one of the four liquid crystal holders 24 constituting the display panel 22. In the first modification, the outer shape of the liquid crystal holder 24 is formed in an inverted trapezoidal shape, a rectangular window is opened in the central region thereof, and the liquid crystal panel 23 (23u, 23d, 23l, 23r) formed in a rectangular shape in the window. ) Is supported. Although not shown, the four liquid crystal holders 24 are configured in an inverted quadrangular pyramid shape by connecting their hypotenuses to each other, and therefore the four liquid crystal panels 23 are arranged in an inverted quadrangular pyramid shape. It is the same as the form 2.

In the second embodiment, the images displayed in the upper, lower, left, and right display areas A (Au, Ad, Al, Ar) are rarely actually displayed over the entire display area A, and each display area is rarely displayed. It is mostly displayed in the central part of A. Therefore, even if the liquid crystal panel 23 is arranged only in the region corresponding to the central portion of each display region A as in the first modification, that is, the rectangular region near the center of the four liquid crystal holders 24, it is substantially the same as in the second embodiment. Can be displayed. As a result, the liquid crystal panel 23 can be miniaturized, which is advantageous for cost reduction.

(Modification 2)
FIG. 9 is a cross-sectional view of a modification 2 of the second embodiment. In the second modification, the shade (light-shielding plate) 25 is arranged at the boundary position of the five liquid crystal panels 23. The shade 25 is formed in a square cylinder shape so as to surround the central liquid crystal panel 23c, and is further formed radially along the boundaries of the upper, lower, left, and right liquid crystal panels 23u, 23d, 23l, and 23r, and is formed along the optical axis Lx2. It consists of an extended non-transmissive plate. Although the shade 25 is integrally formed with the liquid crystal holder 24 here, a separately formed shade 25 may be supported by the liquid crystal holder 24.

According to the second modification, the white light of the backlight 21 is transmitted through each liquid crystal panel 23 and emitted as image light, but the image light emitted from one liquid crystal panel 23 by the shade 25 is emitted from the other liquid crystal panel 23. It is prevented from being mixed with the image light emitted from the or interacting with each other. This makes it possible to display the image displayed in each display area A in the windshield WS as a clear image. The shade 25 may be applied to the image display unit 2 of the first embodiment.

(Modification 3)
FIG. 10 is a cross-sectional view of a modified example 3 of the second embodiment. In this modification 3, the central liquid crystal panel is omitted, and the four liquid crystal panels 23u, 23d, 23l, and 23r form a square pyramid-shaped display panel 22 without a bottom surface. Since the central display area Ac in the windshield WS often visually recognizes the far front of the automobile, the modification 3 is applied when it is required not to display an image in the central display area Ac.

In the present invention, an organic EL may be used instead of the liquid crystal panel 23 as the image display surface constituting the display panels 22 of the first and second embodiments and the first and third embodiments. That is, in the first and second embodiments and the first and third modifications, the organic EL may be configured in a square pyramid shape or a square pyramidal cylinder shape. The image displayed by each organic EL is displayed by the optical system 3 in each display area A (Au, Ad, Al, Ar, Ac) of the windshield WS.

(Embodiment 3)
FIG. 11 is a cross-sectional view of the image display unit 2B of the HUD device 1B of the third embodiment, and FIG. 12 is a schematic perspective view thereof. The image display unit 2B of the third embodiment has a configuration using a DMD (digital micromirror device). The DMD 27 is arranged on the inner bottom surface of the rectangular container-shaped casing 20. A large number of micromirrors 271 are arranged in a matrix on the surface of the DMD 27, and the reflective surface of each micromirror 271 is individually tilted by the control of the display control unit 42 of the display control device 4 shown in the first embodiment. It has become so.

A light source 26 is disposed in the casing 20 facing the surface of the DMD 27, and projects light onto the micromirror 271 of the DMD 27. The light source 26 is composed of, for example, a plurality of LEDs 261 that emit light of three colors of RGB (red, green, and blue), and a lens 262 that projects the light emitted by these LEDs 261 onto the DMD 27 with uniform brightness. This lens 262 is configured as a condenser lens that projects the light emitted by the LED 261 as a parallel luminous flux.

Further, in the casing 20, a screen 28 is arranged so as to face the surface of the DMD 27. As shown in FIG. 12, the screen 28 is formed in a quadrangular pyramid shape by a translucent diffuser plate, and the cylinder axis thereof is the optical axis Lx2 of the image display unit 2B, that is, the center of the surface of the DMD 27. It matches the vertical line that passes through. Further, the screen 27 is arranged with the apex side of the 8-square pyramidal cylinder facing the DMD 27. As a result, the four weight surfaces 28u, 28d, 28l, 28r of the screen 28 are configured as four image display surfaces of up, down, left, and right inclined at a required angle with respect to the optical axis Lx2.

In the image display unit 2B of the third embodiment, the light source 26 is emitted and the light of the light source 26 is projected onto the DMD 27. By selectively tilting the micromirror 271 of the DMD 27 by the display control unit 42 of the display control device 4, a part of the projected light is reflected as a desired light pattern. In forming this optical pattern, the surface of the DMD 27, that is, the micromirror 271, is divided into four regions Su, Sd, Sl, Sr corresponding to the four weight surfaces 28u, 28d, 28l, 28r of the screen 28, respectively. Light patterns are formed in each compartment area.

Then, the light pattern reflected by these four regions Su, Sd, Sl, and Sr is projected onto the corresponding conical surfaces 28u, 28d, 28l, and 28r of the screen 27, and the image corresponding to the light pattern is projected by the light diffusion here. Is visualized. Therefore, each of the weight surfaces 28u, 28d, 28l, and 28r is configured as an image display surface, and the transmitted light by these images, that is, the image light is projected onto the windshield WS by the optical system 3 as in the first embodiment. Will be done.

This image light is reflected by the windshield WS, and when it enters the eyes of the occupant M, a virtual image due to the image light can be visually recognized at a position in front of the automobile, and the image is displayed. Since the screen 28 of the image display unit 2B includes four weight surfaces 28u, 28d, 28l, and 28r as image display surfaces, the virtual images of the images on each image display surface are displayed in the upper, lower, left, and right display areas of the windshield WS. It is visually recognized in Au, Ad, Al, and Ar.

In the third embodiment, as shown by the alternate long and short dash line in FIG. 12, a translucent diffuser plate may be arranged at a portion corresponding to the top surface of the screen 28 to form the central surface 28c. Then, the image projected from the DMD 27 onto the central surface 28c may be displayed in the central display area Ac shown in FIG. 2B of the windshield WS.

Further, the screen in the third embodiment may be formed as an elliptical weight cylinder type screen 28A as shown in FIG. In this case, the image displayed on the Windshield WS is not divided into the upper, lower, left and right display areas, and the image is formed in a conical shape over the entire area or a part of the area of the Windshield WS when viewed from the occupant. It will be displayed. The screen 28A may be cylindrical. Further, it may be in the shape of a perfect circle or an oval.

Also in the third embodiment, each image displayed on the screen 28 by the DMD 27 can be displayed in a plurality of regions of the windshield WS, that is, almost the entire area. Therefore, when the occupant visually recognizes the front region of the automobile, the occupant can visually recognize the image in each display region A without significantly moving the occupant's line of sight, which is effective for safe driving.

In the present invention, the first reflecting portion of the optical system 3 may be a plane mirror. Alternatively, the first reflective portion may not be provided. Further, the windshield WS in the present invention is not limited to the windshield of the automobile described in the embodiment, and may be a part of a vehicle body such as a translucent window provided in the vehicle.

1,1A, 1B HUD device (display device for vehicles)
2,2A, 2B Image display unit 3 Optical system 4 Display control device 20 Casing 21 Backlight 22 Display panel (image display surface)
23 (23u, 23d, 23l, 23r) Liquid crystal panel (image display surface)
24 LCD holder 25 Shade 26 Light source 27 DMD
28 (28u, 28d, 28l, 28r), 28A screen (image display surface)
31 First reflector (plane mirror)
32 Second reflector (concave mirror)
41 Object detection unit (object detection means)
42 Display control unit (display control means)
WS Windshield A (Au, Ad, Ar, Al, Ac) Display area I, Ia, Is, In Virtual image

Claims (10)

It is equipped with an image display unit for displaying an image on the image display surface and an optical system that projects the image light of the displayed image onto the windshield of the vehicle, and the imaginary image of the image is visually recognized by the light reflected by the windshield. The image display unit is a vehicle display device that can be used, and the image display unit includes a plurality of image display surfaces that are inclined at different angles with respect to the optical axis of the optical system, and images are displayed on the plurality of image display surfaces. A display device for a vehicle, characterized in that is displayed. The first aspect of claim 1, wherein each of the plurality of image display surfaces corresponds to a plurality of display areas partitioned by the windshield, and a virtual image of an image displayed on each image display surface is visually recognized in the corresponding area. Vehicle display device. The vehicle display device according to claim 2, wherein the plurality of display areas are four display areas corresponding to the upper, lower, left, and right areas in front of the vehicle, which are visually recognized through the windshield. The vehicle display device according to claim 3, wherein the image display unit includes a plurality of display panels each having an image display surface, and these display panels are formed in a prismatic shape. The vehicle display device according to claim 4, wherein the display panel is composed of a liquid crystal panel or an organic EL. The image display unit includes a light source, a DMD that selectively reflects the light of the light source to form an optical pattern, and a screen on which an image formed by the DMD is projected, and the screen has the optical axis. The vehicle display device according to claim 1, wherein the display device is formed in a weight shape or a weight cylinder shape having a central axis, and the weight surface thereof is formed as an image display surface. The vehicle display device according to claim 6, wherein the screen is formed in a prismatic shape or a prismatic pyramidal shape, and a plurality of weight surfaces are respectively configured as an image display surface. The vehicle display device according to claim 6, wherein the screen is formed in a circular shape or a circular cylinder shape, and the peripheral surface is formed as an image display surface. One of claims 1 to 8, wherein the display control means for controlling the image display on the image display unit is provided, and the display control means can independently control the plurality of image display surfaces. Display device for vehicles described in. The vehicle display device according to claim 9, wherein the display control means includes means for detecting an object existing in front of the vehicle, and displays an image corresponding to the detected object.

Images