JPH06255395A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To realize the virtual image display utilizing the reflection light of the display light supplied from a display device and the display using a projector, with high quality. CONSTITUTION:As for a display panel 7, the surface 7a is formed to a reflecting surface by applying the high reflection processing, such as half mirror treatment, and the back surface 7b is formed to a diffusion surface. The virtual image display is performed by reflecting the display light supplied from a display device 11 only on the surface 7a, and the projection light due to a projector 13 is directly projected on the back surface 7b of the display panel 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular display device capable of displaying a virtual image using reflected light and displaying using a projector.

[0002]

2. Description of the Related Art Conventionally, as a vehicular display device for displaying a virtual image, there is one shown in FIG. 4, for example. This display device is equipped with a speedometer and a tachometer in an automobile. A half mirror 1 is arranged in an inclined state in front of a driver's viewpoint A, and a fluorescent light is provided on a lower surface of a meter hood 3 above the half mirror 1. A display 5 including a display tube is installed. When the display device 5 is driven, display light is emitted from the half mirror 1.
Then, the driver can visually recognize the display information as a virtual image P behind the half mirror 1.

On the other hand, a vehicle display device using a projector is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-181036. The display device described in this publication is used for a vehicle traveling guidance system that displays traveling information such as a road map of a traveling area of a vehicle, a traveling route, and a current position, and the traveling of the vehicle recorded on a film by a projector. The map information indicating the region is projected and projected on the screen, and a thin display member such as an LCD panel or a CRT arranged on the back side of the screen displays the traveling route of the vehicle on the map information.

[0004]

However, as shown in FIG. 5, the vehicle display device using the former virtual image display is as follows.
The display light L from the display 5 is the surface 1a of the half mirror 1.
Regular display light R reflected by the back surface 1 of the half mirror 1
Display light G that forms a so-called ghost image that is reflected by b
And, a double image is formed and visibility is poor.

On the other hand, the display device for a vehicle using the latter projector has a limited sharpness because the display by a display member such as an LCD panel or a CRT is through a screen.

Therefore, an object of the present invention is to improve the virtual image display using reflected light and the display using a projector with higher quality.

[0007]

In order to achieve the above object, the present invention provides a display panel in which a surface facing a user is a reflecting surface and a back surface opposite to the reflecting surface is a diffusing surface. Arranged, the display is provided at a position visible by reflecting the display light on the reflective surface of this display panel,
A projector for projecting display information on the back surface of the display panel is provided behind the display panel.

[0008]

According to the vehicular display device having such a configuration, the display light from the display device is reflected only by the reflection surface of the front surface because the back surface of the display panel is the diffusion surface, and thus the display light is doubled. Image formation is prevented. On the other hand, the projection light from the projector is directly projected on the back surface which is the diffusion surface of the display panel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a vehicular display device showing an embodiment of the present invention. This display device is equipped with a speedometer, a tachometer, and the like mounted on an automobile.
However, the surface 7a is arranged so as to be inclined so as to face upward. A display 11 including a fluorescent display tube is installed on the lower surface of the meter hood 9 extending from the upper end of the dashboard above the display panel 7 into the vehicle compartment. Behind the display panel 7, a projector 13 that directly projects the display information on the back surface 7b of the display panel 7 is arranged.

The display panel 7 is subjected to a high reflection treatment such as a half mirror treatment or a hologram attached on the surface 7a,
The back surface 7b is a diffusion surface. As a structure of such a display panel 7, those shown in FIGS. 2A, 2B, and 2C are conceivable. The display panel 7 of FIG. 2A is a so-called cloudy LCD which is semi-transparent as a whole, and the front surface 7a serving as a reflecting surface is a half mirror (or hologram) 15 and the back surface 7b serving as a diffusing surface is a liquid crystal portion 17. The liquid crystal part 17 which is configured is sealed between the half mirror 15 and the transparent glass 19. In the display panel 7 of FIG. 2B, the surface 7a is a half mirror (or hologram).
In Fig. 15, the back surface 7b is composed of a diffuser plate 21 made of frosted glass, and both are bonded with an adhesive. An adhesive having a refractive index similar to that of frosted glass is used. The display panel 7 of FIG. 2 (c) uses a translucent glass 23, the front surface 7a of which is subjected to a half-mirror treatment, and the back surface 7b of which is provided with unevenness which serves as a diffusion surface.

According to the vehicular display device having such a structure, the display light L from the display 11 is reflected by the surface 7a of the display panel 7, and the driver can visually recognize the display image as a virtual image. . At this time, the display light L is emitted from the display panel 7
Since the back surface 7b is a diffusing surface, the back surface 7b does not reflect the light, but only the front surface 7a. Therefore, a double image does not occur, visibility is improved, and a high-quality virtual image display can be provided.

On the other hand, when the projector 13 is driven, the projection light is projected on the back surface 7b of the display panel 7, and the driver can clearly see the projected image as a real image. Projector 1
The display content of 3 can display a large amount of information by using an LCD that performs dot display on the display device, and an LCD or film having a fixed pattern can also be used according to the application.

In FIG. 3, a mirror 23 is provided behind the display panel 7.
Is arranged, and the projection light of the projector 13 arranged below the display panel 7 is reflected by the mirror 23 and projected on the back surface 7b of the display panel 7. With such a configuration, the installation space behind the display panel 7 can be small.

If the surface 7a of the display panel 7 does not have to be highly reflected by the brightness of the display 11, the virtual image may be displayed only by the surface reflection of glass.

[0016]

As described above, according to the present invention, the display light from the display device is reflected only by the reflection surface of the front surface because the back surface of the display panel is a diffusion surface, and the display light is doubled. It is possible to prevent the generation of an image and improve the visibility.
On the other hand, the projection light from the projector is projected on the back surface of the display panel, and the projected image can be clearly viewed as a real image, and high-quality display can be performed together with the virtual image display.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a vehicle display device showing an embodiment of the present invention.

FIG. 2 is a structural diagram of a display panel in the vehicle display device of FIG.

FIG. 3 is an overall configuration diagram of a vehicle display device showing another embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a conventional vehicular display device using virtual image display.

5 is an explanatory diagram showing an optical path of reflected light in a half mirror of the vehicle display device of FIG.

[Explanation of symbols]

 7 display panel 7a front surface 7b back surface 11 indicator 13 projector

Claims (1)

[Claims] 1. A display panel having a front surface facing a user as a reflection surface and a back surface opposite to the reflection surface as a diffusion surface, and the display light is reflected on the reflection surface of the display panel. A display device for a vehicle, characterized in that a display device is provided at a position visible to the user, and a projector for projecting display information is provided on the back surface of the display panel behind the display panel.