JPH09132055A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an incident and emitting angle and a virtual image display distance of display light to be set arbitrarily thereby to improve a degree of freedom of a system configuration by utilizing a reflected type hologram for a reflection member in a indicator indicating display information of the indicator as a virtual image. SOLUTION: A hologram display panel 6 is arranged in a dashboard in front of a viewpoint 1 of a driver so that a speedometer, a rotating meter, a winker, a warning and the like can be viewed as virtual images 7, 8. Then, indicators 4, 5 are installed to an underside of a meter hood 3 above the display panel 6. The display panel 6 employs a reflection type hologram and changes a virtual image display distance by changing a light source distance of a reference beam. For example, the display distance of red virtual image display 8 is set shorter than that of green virtual image display 7. Thereby, the high quality virtual image display can be provided which improves visibility without double images.

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, and more particularly, to reflecting light emitted from a display device by a reflecting member to guide it to a driver's viewpoint so that the display information of this display device can be visually recognized as a virtual image. The present invention relates to a display device for a vehicle.

[0002]

2. Description of the Related Art A conventional vehicular display device for displaying a virtual image is shown in FIG. The display device for a vehicle is capable of displaying a speedometer, a tachometer, a warning, etc. in an automobile, and a display panel 2 using a reflection member such as an acrylic plate is arranged in an inclined state in front of a driver's viewpoint 1.
On the lower surface of the meter hood 3 above the display panel 2, indicators 4 and 5 including a fluorescent display tube and the like are installed. The light from the display units 4 and 5 is reflected by the display panel 2, and the driver can visually recognize the display information behind the display panel 2 as display virtual images 7 and 8. The display 4 displays a speedometer, a tachometer, etc. as a display virtual image 7, and the display 5 displays a warning etc. as a display virtual image 8. Here, as the reflecting member used in the display panel 2, a opaque smoke acrylic plate or the like is usually used in order to prevent a double image due to its front surface reflection and back surface reflection. There are also examples in which a concave reflecting member is used to extend the display distance of the display virtual image or to enlarge the display virtual image. There is also an example in which a display source such as a warning or a turn signal is arranged in smoke acrylic, and a speedometer, a tachometer, etc. are displayed as a virtual image, and a warning or a turn signal is displayed as a real image.

[0003]

Since the conventional vehicular display device for displaying a virtual image utilizes mere specular (surface) reflection of an acrylic plate or the like, the incident and outgoing angles of display light must be equal. However, there was a limitation on the system configuration. Also, it is necessary to make the acrylic plate opaque in order to prevent double images due to the front and back reflections of the acrylic plate,
There is a problem that the cost is increased and it is not possible to arrange another display light source behind the acrylic plate. Furthermore, the virtual image display distance is equal to the distance from the display light source to the reflecting member,
In order to extend it further, it is necessary to process the reflecting member into a concave surface, which leads to an increase in cost. In addition, in order to give a stereoscopic effect to the display by changing the display distance of the speedometer, tachometer, etc. and the display distance of the warning, turn signal, etc., it is necessary to arrange each display light source at a different position. There was a problem in terms of cost and system configuration.

[0004]

The present invention has been made to solve the above-mentioned problems, and is characterized in that a reflection hologram is used in place of a conventional smoke acrylic plate or a half mirror.

That is, the vehicular display device of the present invention is provided in the dashboard of the vehicle, and the light emitted from the display device is reflected by the reflecting member to guide it to the driver's viewpoint to display the display information on the display device. In a display device for a vehicle that can be visually recognized as a virtual image, a reflective hologram is used for the reflecting member.

In the vehicle display device according to the present invention,
Since the reflection hologram is used for the reflecting member, the incident / emission angle of the display light and the virtual image display distance can be arbitrarily set, and as a result, the degree of freedom of the system configuration is improved.

Further, since the hologram is used for the reflecting member, a double image can be prevented while maintaining the transparency of the reflecting member. Furthermore, by utilizing its transparency, another display information source can be placed on the opposite side of the reflective hologram display, and a real image due to light from the display information source can also be displayed. And virtual image display can be displayed in one instrument panel.

Further, by using a reflection hologram having a plurality of different virtual image display distances according to display information as the reflecting member, a plurality of virtual images can be visually recognized at different display distances. As a result, the display distance between the portion where the display light source is present and the portion where the display light source is present at the same place can be made different, the stereoscopic effect of the display can be easily obtained, and the importance of the display can be expressed by the virtual image display distance. For example, by displaying virtual images such as speedometers and tachometers and virtual images such as warnings and turn signals at different distances, a three-dimensional effect is created in the display, and the importance of the display can be expressed by the virtual image display distance. Become. Examples of such a reflection hologram include a reflection laminated hologram in which a plurality of reflection holograms having different virtual image display distances are laminated, or a multiple exposure reflection hologram having a plurality of different virtual image display distances.

Furthermore, by recording an image of a warning or the like on a reflection hologram, a three-dimensional warning can be displayed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a vehicle display device of the present embodiment. This vehicle display device is a speedometer, tachometer, turn signal,
A warning display and the like can be displayed, and a hologram display panel 6 is tilted and arranged in the dashboard in front of the viewpoint 1 of the driving vehicle. On the lower surface of the meter hood 3 extending from the upper end of the dashboard above the hologram display panel 6 to the passenger compartment, indicators 4 and 5 including cold cathode tubes are installed.

Hologram display panel 6 of the present embodiment
Is a reflection hologram having two lens effects. In this embodiment, the hologram display panel 6 is produced by stacking holograms produced by the exposure optical system as shown in FIGS. FIG. 2 is a schematic cross-sectional view showing a hologram exposure system that reflects a green display (speedometer, tachometer, etc.), and the hologram material 13 is exposed by the dye laser 9 having an oscillation wavelength of 570 nm. FIG. 3 is a schematic cross-sectional view showing an exposure system of a hologram that reflects a red display (warning or the like), and the hologram material 13 is exposed by the Kr laser 10 having an oscillation wavelength of 647 nm. In any case, the light emitted from the laser 9 (10) is split into two, an object light and a reference light, by a beam splitter 12, and these lights are hologramed via a mirror 11 and a spatial filter 14, respectively. It is incident on the material 13.

Here, in the exposure system of FIG. 2 and the exposure system of FIG. 3, the incident angles of the object light and the reference light are equal, and the light source distance of the object light is also equal. Therefore, by changing the light source distance of the reference light between the exposure systems of FIGS. 2 and 3, the holograms created by the respective exposure systems have different lens effects, and the virtual image display distances of green and red are changed. There is.
In the case of the present embodiment, the display distance of the red virtual image display 8 is made shorter than the display distance of the green virtual image display 7.

According to the vehicular display device having such a configuration, the display light from the display units 4 and 5 is diffracted by the hologram display panel 6, and the driving vehicle visually recognizes the display images as virtual images 7 and 8. You can The display 4 displays a speedometer, a tachometer, etc. as a green display virtual image 7, and the display 5 displays a warning etc. as a red display virtual image 8.

In the present embodiment, since the display light is diffracted by the hologram, a double image is not generated, visibility is improved, and a high-quality virtual image display can be provided. Also, since the green display 7 such as the speed system and the tachometer and the red display 8 such as the warning are displayed as virtual images at different distances, a stereoscopic effect is generated in the display, and the importance of the display is expressed by the virtual image display distance. I can do it now.

In this embodiment, two holograms are laminated, but a replica is produced by using the laminated holograms as a master hologram, so that one hologram material is a multiple exposure hologram having two lens effects. Can also be manufactured.

The hologram used in the present invention is preferably made of a material such as photopolymer, DCG or silver salt.

It is also possible to dispose another display light source (not shown) behind the hologram display panel 6 and display a real image by the light from the display light source together.
Furthermore, an image such as a warning display is displayed on the hologram display panel 6
It is also possible to display the warning three-dimensionally by recording in.

[0018]

By using the vehicle display device according to the present invention, it is possible to arbitrarily set the incident / emission angle of display light and the virtual image display distance, and the degree of freedom of the system configuration is improved.

Since a hologram is used, a double image can be prevented while maintaining transparency. Furthermore, by utilizing its transparency, it is possible to arrange another display information source behind the hologram and display the real image due to the light from the display information source together. Can be displayed in the instrument panel.

Further, a plurality of reflection holograms having different virtual image display distances can be laminated or subjected to multiple exposure, whereby the display distance between a portion having a display light source at the same place and a certain portion can be made different. The stereoscopic effect of display can be easily obtained, and the importance of display can be expressed by the virtual image display distance in addition to the conventional expression by color.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a vehicle display device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a method of manufacturing a hologram display panel.

FIG. 3 is a schematic cross-sectional view showing a method of manufacturing a hologram display panel.

FIG. 4 is a schematic cross-sectional view showing a conventional vehicle display device.

[Explanation of symbols]

 1: Viewpoint 2: Display panel 3: Meter hood 4: Display device (speed, tachometer display) 5: Display device (warning display) 6: Hologram display panel 7: Display virtual image (speed, tachometer) 8: Display virtual image ( Warning) 9: Dye laser 10: Kr laser 11: Mirror 12: Beam splitter 13: Hologram material 14: Spatial filter

Claims (4)

[Claims] 1. A vehicle equipped in a dashboard of a vehicle, wherein light emitted from a display device is reflected by a reflecting member to be guided to a driver's viewpoint so that display information on the display device can be visually recognized as a virtual image. A display device for a vehicle, wherein a reflective hologram is used for the reflecting member. 2. The vehicle display device according to claim 1, wherein the reflective member is a multiple exposure reflective hologram having a plurality of different virtual image display distances. 3. The vehicle display device according to claim 1, wherein the reflection member is a reflection type laminated hologram in which a plurality of reflection type holograms having different virtual image display distances are laminated. 4. A display information source is further provided on the opposite side of the reflection type hologram from the display so that a real image by light from the display information source can be displayed together. Item 5. The vehicle display device according to any one of Items 1 to 3.