JP2003066536A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which is excellent in the reproducibility of colors of display images. SOLUTION: The display device has a projector which radiates signal light 31 including a prescribed image information, a mirror 61 which is arranged in front of a viewer 81 and a hologram screen 15 of a transmission type which diffracts the signal light 31 radiated from the projector and diffuses the signal light to a central angle different from an incident angle. The hologram screen 15 and the projector are arranged in front of or behind the half mirror such that the viewer 81 can visually recognizes the prescribed image. The display device is provided with rear light shielding means for preventing the admission of the external light from the side of the half mirror opposite to the hologram screen.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a display device for displaying a predetermined image.

[0002]

2. Description of the Related Art As shown in FIG. 4, a hologram element 93 having a good light-transmitting property is arranged immediately in front of a screen 91 so that a light 82 traveling in the same direction as a line of sight 819 of a viewer 81 is reflected by the hologram element 93.
There is proposed a new image synthesizing device 9 which reflects (diffracts) the light and photographs the reflected (diffracted) light 821 (see Japanese Patent Laid-Open No. 5-328336). As a result, it is possible to eliminate the discomfort caused by the above-mentioned line-of-sight mismatch.

That is, a reflection type hologram element 93 is provided on the front surface of the display screen 91, and the vicinity of the eyes of the viewer 81 and the screen 91.
The light 9 that travels along the line connecting the center of
It is made to enter into No. 2 so that the line of sight of the viewer 81 and the line of sight of the display image 891 of the viewer do not deviate.

In the figure, reference numeral 83 is a display light emitted from the screen 91, reference numeral 831 is a component of the display light 83 reaching the viewer 81 through the hologram element 93 (transmitted light), and reference numeral 832 is a hologram. Diffraction (reflection) at element 93
It is a component of the generated display light 83. That is, the diffracted light 832
Is a component which is excluded from the display light 83 and does not reach the eyes of the viewer 81.

[0005]

However, the improved image synthesizing device 9 shown in FIG. 4 has the following problems. This is because the hologram element 93 has a wavelength selection region, so that faithful color imaging cannot be performed and faithful color display cannot be performed. That is, the camera 92
The diffracted light 821 of the hologram element 83 captured by is not colored with a constant diffraction efficiency, and is therefore colored in a specific selected wavelength region.
Reference numeral 31 is light obtained by removing the diffracted light 832 from the display light 83, and is colored in the opposite manner to the above.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a display device having excellent color reproducibility of a display image.

[0007]

According to a first aspect of the present invention, a display device that emits signal light containing predetermined image information, a mirror arranged in front of a viewer, and a signal light emitted from the display device are diffracted. It has a transmission type hologram screen that diffuses the signal light at a center angle different from the incident angle. The hologram screen and the display device are placed in front of the mirror so that the viewer can see a predetermined image. The display device is characterized in that it is possible.

Although it is a transmission type hologram screen having good color reproducibility, it eventually reflects the signal light and acts as a reflection type hologram screen.

Next, a second invention of the present application is a projection device which emits a signal light containing predetermined image information, a half mirror arranged in front of a viewer, and a signal light emitted from the projection device. And a transmission type hologram screen for diffusing the signal light at a central angle different from the incident angle and arranging the hologram screen and the projection device in front of or behind the half mirror to obtain a predetermined image. The display device is characterized by making it visible.

As a result, the first viewer on the projector side also
A second viewer on the opposite side of the projector can also visually recognize the display image recorded in the signal light.

[0011]

As described in claim 3, it is preferable to provide a rear light shielding means for preventing external light from entering from the side of the half mirror opposite to the hologram screen. This is because the display image reflected by the half mirror or transmitted through the half mirror will not be disturbed by incoming external light or the contrast of the display image will be reduced.

Further, as described in claim 4, it is preferable to provide a front light shielding means for preventing external light from entering from a side of the hologram screen opposite to the mirror or the half mirror. This prevents the display image diffracted from the hologram screen from being disturbed by the external light that enters from the outside and is transmitted through the screen, the external light that is diffracted by the screen and transmitted, and that the contrast is not reduced.

The hologram screen according to the present invention uses a transmission hologram. Regarding the diffraction wavelength characteristic of the transmission hologram, the selected wavelength band is wide, and therefore the color tone of the diffraction image (display image) and the transmitted image (captured image) is good (diffraction characteristic of the transmission hologram shown in FIG. 5A). And an example of the diffraction characteristics of the reflection hologram shown in FIG. 5B). That is, the color tone of the viewer image captured by the image capturing means is good, and the reproducibility of the color of the display image formed on the screen and diffused is good. The material of the transmission type hologram constituting the hologram screen of the first invention and the second invention is, for example, photopolymer or DCG.
(Dichromated gelatin).

[0014]

Embodiment 1 This embodiment is a display device 100 for displaying an image that can be selectively displayed, and as shown in FIG. 1, a projection device that emits a signal light 31 including predetermined image information. 2, the mirror 61 arranged in front of the viewer 81, and the signal light 31 emitted from the projector 11 as shown in FIG. 2, diffracts the signal light 31 (diffracted light) at a central angle different from the incident angle. 32) and a transmission type hologram screen 15 for diffusing light.
Are arranged in front of the mirror 61 so that the viewer 81 can visually recognize a predetermined image projected from the projector 11.

That is, as shown in FIG. 2, the signal light 31 projected from the projector 11 onto the screen 15 is diffracted by the transmission hologram of the screen 15, and the diffracted light 32 advances to the mirror 61. The diffracted light 32 is specularly reflected by the mirror 61, enters the screen 15 at an angle that is not diffracted, passes through the transparent screen 15, and reaches the viewer 81.
Then, the viewer 81 visually recognizes the projected display image. In FIG. 2, reference numeral 611 is a reflecting surface of the mirror 61.

As described above, the transmissive hologram screen 15 having a good color reproducibility, as a result, reflects the signal light 31 and acts as a screen of a reflective hologram. Therefore, the projector 11 can be installed on the side of the viewer 81, and it is possible to deal with the arrangement conditions such as a barber shop where the space behind the screen 15 is small.

(Embodiment 2) In this embodiment, as shown in FIG.
In the first embodiment, the half mirror 6 is used instead of the mirror 61.
2 is another embodiment. As a result, the projector 1
The signal light 31 projected from 1 is diffracted by the screen 15 of the transmission hologram, a part 321 of the diffracted light 32 is reflected by the half mirror 62, and the other part 322 is transmitted through the half mirror 62.

Therefore, the first viewer 811 on the side of the projector 11 also has the second viewer 812 on the side opposite to the projector 11.
Can also visually recognize the display image recorded on the signal light 31. Similarly, the display lights 36 and 37 recording the images of the viewers 811 and 812 are reflected or transmitted by the half mirror 62 and travel forward and backward. By visually recognizing the reflected light 361, 371 or the transmitted light 362, 372, it is possible to visually recognize the images of the viewers 811 and 812 together with the display image on either side.

Therefore, one side of the hologram screen 15 (half mirror 62) is darkened and the other viewer 81
The viewers 811 and 812 on both sides can simultaneously view the composite image composed of the viewers 812 and 811 on the other side and the display image so that the images of the viewers 1 and 812 are not captured. Others are the same as in the first embodiment.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a display device according to a first embodiment.

FIG. 2 is a diagram schematically showing the behavior of light entering and exiting the hologram screen and the mirror of the display device according to the first embodiment.

FIG. 3 is a system configuration diagram of a display device of Example 2 and a diagram schematically showing behavior of light entering and exiting a hologram screen and a half mirror.

FIG. 4 is a diagram schematically showing a behavior of light entering and exiting a hologram screen and a display screen of a conventional image synthesizing display device.

5A and 5B show an example (a) of diffraction characteristics of a transmission hologram and an example (b) of diffraction characteristics of a reflection hologram.

[Explanation of symbols]

11. ． ． Projector (projector), 15. ． ． Hologram screen, 25. ． ． Imaging means (camera), 31. ． ． Signal light, 81. ． ． Viewer,

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H021 BA00                 2H049 CA05 CA09 CA11                 2K103 BB05 CA01                 5C058 BA23 EA02 EA12 EA13 EA14                       EA33

Claims (4)

[Claims] 1. A projection device that emits signal light containing predetermined image information, a mirror arranged in front of a viewer, and a center different from the incident angle by diffracting the signal light emitted from the projection device. A display having a transmission type hologram screen for diffusing signal light at an angle, wherein the hologram screen and the projection device are arranged in front of a mirror so that a predetermined image can be visually recognized by a viewer. apparatus. 2. A projection device which emits signal light containing predetermined image information, a half mirror arranged in front of a viewer,
A transmission type hologram screen that diffracts the signal light emitted from the projection device and diffuses the signal light at a central angle different from the incident angle. The hologram screen and the projection device are provided in front of a half mirror. Alternatively, a display device characterized in that it is arranged at the rear so that a predetermined image can be viewed. 3. The display device according to claim 2, further comprising a rear light shielding unit that prevents external light from entering from a side of the half mirror opposite to the hologram screen. 4. The front light-shielding device according to claim 1, further comprising a front light-shielding unit that prevents external light from entering from a side of the hologram screen opposite to a mirror or a half mirror. And display device.