JP2602676Y2 - Display device for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION In the present invention, a display image of a display device for displaying vehicle information such as a vehicle speed is reflected once by a reflection member such as a reflection plate, and further reflected by a windshield or the like in front of a driver's seat. The present invention relates to a so-called head-up display type vehicle display device in which a virtual image of a display image is visually recognized behind a windshield or the like from a viewpoint of a driver.

[0002]

2. Description of the Related Art In general, a large number of vehicular display devices for directly displaying a display image on a display device are used. In this, a display for displaying vehicle information is arranged on the driver's side of the dashboard.However, a driver who was looking at the outside scene in front of the vehicle needs to look down to see the display image of the display. There is a problem that it is necessary to move one by one. In particular, there is a problem that not only the movement of the line of sight is large but also the focus is hard to focus during high-speed running because the user is looking at a distant outside scenery.

For this reason, the movement of the line of sight is reduced as much as possible, and the focusing of the eyes is not required so much.
A so-called head-up display device has been proposed and used in which a virtual image of a display image of a display is displayed at a distance behind a windshield (in front of a vehicle).

One example is shown in FIG. As shown in the figure, a display 6 for displaying driving information is arranged on the vehicle ceiling 5 with its display surface facing the front of the vehicle, and reflects the display light of the display 6 on the dashboard 2. Is provided with a concave mirror 7 with its concave reflecting surface facing the display 6 side. For this reason, the display light emitted from the display 6 is reflected by the concave mirror 7, further reflected by the windshield 1, and guided to the driver's viewpoint 4. (In front of the vehicle).

In this case, the shape (curvature) of the concave surface of the concave mirror 7 is set so that the display 6 is located within the focal point of the concave mirror 7. The distance D ₀ to the optical path (D ₁₎ from the windshield 1 through the concave mirror 7 to the display 6
+ D ₂ ), and a sufficient effect of distant display can be obtained. In addition, as the display 6, a fluorescent display tube, an LED display element, a liquid crystal display element with a backlight, or the like is used. In the above-described example, the concave mirror 7 is used as the reflection member, but a flat mirror may be used instead of the concave mirror 7. In this case, the distance D ₀ from the windshield 1 to the virtual image X is equal to the optical path (D ₁ + D ₂ ) from the wind shield 1 to the display 6 via the concave mirror 7.

[0006]

However, as described above, when the indicator 6 is arranged on the vehicle ceiling 5 and the reflecting member (concave mirror) 7 is placed on the dashboard 2, the light is reflected by the reflecting member 7. In order to prevent external light such as sunlight from reaching the driver's viewpoint 4, it is necessary to prevent the driver having the viewpoint 4 at the upper end of the eye range indicated by the dotted line from seeing the upper end of the reflection member 7. . Therefore, the reflecting member 7 to the driver side of the dashboard 2 on the surfaces of more, of the eye range an upper end and the reflecting member 7 of the line L ₁ connecting the upper height and the large opening cover 2a walls having the same height Must be arranged in such a way.

Further, the size of the reflecting member 7 needs to be determined in consideration of the eye range. The larger the eye range, the larger the reflecting member 7 must be. In this case, in order to reduce the size of the reflecting member 7, the viewpoint 4 within the eye range is required.
It is necessary to provide a rotation mechanism so that the reflection member 7 can be rotated in accordance with the position (1).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle display device having a small reflecting member and a wide viewing area.

[0009]

SUMMARY OF THE INVENTION A display device for a vehicle according to the present invention firstly displays light of a display device installed on a ceiling of a vehicle.
The reflected light is reflected by a first reflecting member disposed on a dashboard surface, and the reflected light is further reflected by a second reflecting member provided on a windshield to guide the driver to a driver's viewpoint, and a display image is displayed behind the second reflecting member. In the vehicle display device for visually recognizing the virtual image, the display is configured by a projector, the second reflection member is configured by a non-specular reflection hologram, and the first reflection member is configured by a reflection type diffusion plate. The image of the projector is formed on the diffuser surface of the first reflecting member, and the image is reflected by the second reflecting member to guide the image to a driver's viewpoint.

Secondly, in the display device for a vehicle according to the first aspect, the diffuser plate is configured such that external light incident from outside the windshield with the driver's viewpoint inside is located at the driver's viewpoint. A display device for a vehicle, characterized in that the display light is emitted and guided to a driver's viewpoint without being guided.

[0011]

With the above arrangement, when the power of the projector is turned on, an image displayed in the projector is formed as a real image on the surface of the diffusion plate by the action of a lens or the like. The diffuser acts like a cinema screen, where the projected image is reflected by the windshield and directed to the driver's point of view. For this reason, from the driver's viewpoint, a virtual image of an image formed on the diffuser surface can be visually recognized behind the windshield (in front of the vehicle). In this case, the driver is watching the real image formed on the diffuser surface through the windshield, so that the eye range becomes very wide.

In the case where the windshield is provided with a non-specular reflection hologram as a second reflection member, the incident / reflection angle of the non-specular reflection hologram is appropriately formed, so that it is displayed on the dashboard. A large degree of freedom in the location of the first reflecting member to be installed can be secured.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that the same members as those described in the related art are denoted by the same reference numerals.

FIG. 1 shows a display device for a vehicle which is an example of the present invention. As shown in the figure, a projector (projector) 20 for displaying driving information is arranged on the ceiling 5 of the vehicle, and the projector 20 is directed to the surface of the dashboard 2, and emits light on the dashboard 2. A reflection-type diffusion plate 30 that reflects light is provided. The diffuser plate 30 is installed so that its reflection surface faces the projector 20 and also faces the windshield 1 of the vehicle.

As shown in FIG. 2, the projector 20 uses a liquid crystal display element as a display device 21, and a reflecting mirror 2 is provided behind the display device 21.
Two light sources 23 are provided. Between the light source 23 and the display device 21, a cold filter 24 and a condenser lens group 25 for cutting infrared rays are arranged, and the display device 21 is efficiently irradiated with light from the light source 23, and The configuration is such that the temperature rise of the display device 21 due to the irradiation is suppressed as much as possible.

A projection lens 26 is disposed on the front of the display device 21. By adjusting the projection lens 26, an image appearing on the display device 21 is formed as a real image on a screen surface disposed outside. Can be done. Therefore, the projection lens 26 of the projector 20 is adjusted so that the image of the display device 21 is formed on the surface of the diffusion plate (screen) 30 provided on the dashboard 2.

For this reason, when the power of the projector 20 is turned on, the display device 21 in the projector 20 is turned on.
Is formed as a real image on the surface of the diffusion plate 30 by the action of the projection lens 26. The diffuser plate 30 acts like a movie screen, and the projected image is reflected by the windshield 1 and guided to the driver's viewpoint 4. For this reason, from the driver's viewpoint 4, a virtual image of an image formed on the surface of the diffuser plate 30 can be visually recognized far away from the windshield 1 (front of the vehicle). In this case, the driver is viewing the real image formed on the surface of the diffuser plate 30 through the windshield 1, so that the eye range is very wide.

As described above, since the real image is projected on the surface of the diffusion plate 30, it is not necessary to determine the size of the reflecting member in consideration of the visual field as in the related art, and the virtual image projected on the windshield 1 is not required. The size of the diffusion plate 30 should be prepared. Further, since the reflecting member is not a mirror but a diffusion plate 30 as in the prior art, there is no problem with respect to external light. However, in order to prevent the driver from directly seeing the real image on the surface of the diffusion plate 30, it is shown in FIG. from the eye range an upper end to a height of diffuser 30 line L ₂ connecting the front dashboard 2
It is necessary to provide a wall on top.

Next, the second embodiment of the vehicle display device according to the present invention will be described.
An example will be described. The same parts as those in the first embodiment are denoted by the same reference numerals.

FIG. 3 shows a second embodiment.
This embodiment is different from the previous embodiment in that a non-specular reflection hologram is attached to one surface of the windshield. In the above embodiment, the image projected from the projector 20 and formed on the surface of the diffuser 30 is the windshield 1.
In this embodiment, the image formed on the surface of the diffusion plate 30 is reflected by the non-specular reflection hologram 4 attached to the windshield 1.
The light is reflected by 0 and guided to the driver's viewpoint 4. A non-specular reflection hologram is a reflector in which the angle of incidence of light incident on the hologram surface and the angle of reflection of the light are different. It was created.

Therefore, by forming the non-specular reflection hologram 40 as required, the second reflection plate 30 can be installed at any position on the dashboard 2 surface. In addition, as long as there is no obstacle between the projector 20, the diffusion plate 30, and the windshield 1, the diffusion plate 30 can be placed anywhere other than on the dashboard 2 surface. Also, a diffusion plate 3 as a screen
Since the degree of freedom increases even with the 0 arrangement angle, dashboard 2
The diffusion plate 30 can be installed in a state conforming to the shape of.

[0022]

[Effect of the invention] As described above, according to the invention,
Since a real image was projected on the reflecting member surface made of a diffusion plate on the dashboard using a projector, it is sufficient to use a reflecting member that can cover the size of the real image,
The size of the reflecting member can be reduced, and the viewing area can be enlarged because the real image is viewed through the windshield, and the opening cover on the dashboard can be reduced. Further, according to the present invention, since the non-specular reflection hologram is arranged on the windshield surface, the incident / reflection angle of the non-specular reflection hologram is appropriately formed, whereby the arrangement of the first reflection member installed on the dashboard is performed. A large degree of freedom in location can be secured.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle display device according to an embodiment of the present invention.

FIG. 2 is a cutaway view of the projector used in the vehicle display device according to the embodiment of the present invention.

FIG. 3 is a side view of a vehicle display device according to a second embodiment of the present invention.

FIG. 4 is a side view of a conventional vehicle display device.

[Explanation of symbols]

 Reference Signs List 1 windshield 2 dashboard 4 viewpoint 5 vehicle ceiling 20 projector 30 diffuser (screen) 40 non-specular reflection hologram

Claims (2)

(57) [Scope of request for utility model registration] 1. A display device provided on a ceiling of a vehicle reflects a display light on a first reflection member disposed on a dashboard surface, and further includes a second reflection light provided on a windshield .
The light is reflected by the reflection member and guided to the driver's viewpoint, and the second reflection portion is provided.
In a vehicle display device for visually recognizing a virtual image of a display image behind a material, the display device is configured by a projector, and
The second reflection member is constituted by a non-specular reflection hologram, and
The first reflection member is constituted by a reflection type diffusion plate, and an image of the projector is formed on the diffusion plate surface of the first reflection member.
Then, the image is reflected by the second reflection member, and the image is reflected from the driver's viewpoint.
A display device for a vehicle, wherein the display device is guided to a vehicle. 2. The display device for a vehicle according to claim 1, wherein the diffuser plate does not guide external light incident from outside the windshield with the driver's viewpoint inside, and does not guide the light to the driver's viewpoint. A display device for a vehicle, wherein the display light is emitted and guided to a driver's viewpoint.