JPH08297459A - Display device - Google Patents

Abstract

PURPOSE: To observe a fine reproduced picture without being disturbed by the face of an observer and back sight and the like in the case of observing the reproduced picture in a bright room. CONSTITUTION: In this display hologram 1, a perpendicular direction with respect to a hologram surface is set so that it is inclined at a first specified angle to the frontal direction, reproduction is performed with illuminating light having a second specified angle nearly in parallel with the hologram surface, and the reproduced picture can be observed around front ways. An illuminating light source 2 illuminating the hologram 1 with the light having the second specified angle, and a blind-state light shielding body 3 arranged on the observing surface side of the hologram 1, making only the light around front ways pass through, and shielding the light in the direction inclined about nearly twice as much as the first specified angle from the front direction are integrated. The first specified angle is the one by which the light passing through the body 3 is reflected on the surface of the hologram 1 so as not to reach the observer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device used for a display hologram used for expression of a three-dimensional image or the like, and particularly when observing a reproduced image in a bright room, the quality of the reproduced image is improved. The present invention relates to an improved display device.

[0002]

2. Description of the Related Art Conventionally, the present applicant has proposed a display device for obtaining a reproduced image with little blurring in a small space by using a display hologram used for displaying a three-dimensional image. There is.

FIG. 2 is a side view showing a configuration example of this type of display device. This display device is shown in FIG.
As shown in FIG. 3, a reflection hologram 5 which is a display hologram reproduced at an illumination angle (for example, 70 to 80 degrees) nearly parallel to the hologram surface, and an illumination light source 6 which illuminates the reflection hologram 5. , A blind-shaped light-shielding plate 7 that allows only light in the vicinity of the front surface to pass through, the reflection hologram 5, the illumination light source 6, and the light-shielding plate 7.
And a support base 8 for supporting the.

In such a display device, the reflection hologram 5 is an illumination light source 6 for reproducing under ideal conditions.
Since it is reproduced by the light from, it is possible to obtain a reproduced image without blur.

The reproduction illumination light is reflected by the reflection hologram 5.
Since the light is incident on the hologram surface at an angle of 70 to 80 degrees, which is almost parallel to the hologram surface, the size of the illumination light source 6 can be reduced, and the entire apparatus does not occupy space.

Furthermore, the reflection hologram 5 is obliquely viewed.
Since the light incident on the light is blocked by the light shielding plate 7, it is possible to prevent the image distorted from being reproduced by the light from the external light source even in a bright room.

However, in such a display device, since the light incident on the reflection hologram 5 from the front direction is not blocked, when observing a reproduced image in a bright room, the observer's face or the scene behind is observed. Etc. are reflected on the surface of the reflection hologram 5 and appear together with the reproduced image.

Particularly, in a surface relief reflection type hologram such as an embossed hologram, aluminum is evaporated on the hologram surface to increase the reflectance, so that the observer's face, the scene behind, and the like appear quite bright. It becomes an obstacle for observing the reproduced image.

[0009]

As described above, in the conventional display device, when observing a reproduced image in a bright room, the observer's face, a scene behind, etc. can be seen together with the reproduced image. However, there is a problem that it interferes with observing the reproduced image.

The present invention has been made in order to solve the above problems, and even when a reproduced image is observed in a bright room, it is hindered by the reflection of the observer's face or the scene behind. An object of the present invention is to provide a display device capable of observing a beautiful reproduced image without any trouble.

[0011]

In order to achieve the above object, first, in a display device of the invention according to claim 1, the direction perpendicular to the hologram surface is only a first predetermined angle with respect to the front direction. When it is installed so as to be tilted and reproduced with illumination light at a second predetermined angle that is nearly parallel to the hologram surface, the reproduced hologram is observed from the direction near the front surface and the light at the second predetermined angle. The illumination light source that illuminates the display hologram and the observation surface side of the display hologram are arranged so that only the light in the direction near the front surface passes and the light in the direction inclined by about twice the first predetermined angle from the front direction is blocked. The first predetermined angle is such that the light passing through the light shield does not reach the observer by being reflected by the surface of the display hologram. The degree.

A display device according to a second aspect of the present invention is the display device according to the first aspect of the present invention, in which a support base for supporting the display hologram, the illumination light source, and the light shield is added.

Here, particularly as the above-mentioned first predetermined angle, the perpendicular direction of the hologram surface is 10 to 20 from the front direction.
It is preferable that the angle is in the range of degrees and the second predetermined angle is an angle in the range of 70 to 80 degrees from the perpendicular of the hologram surface.

[0014]

Therefore, in the display device of the present invention, the direction perpendicular to the hologram surface is inclined with respect to the front direction by such an angle that the light passing through the light shield is reflected by the display hologram surface and does not reach the viewer. As described above, by installing the display hologram, by the blind-shaped light-shielding plate that passes only the light in the direction near the front, which is arranged on the observation surface side of the display hologram,
Even when observing a reproduced image in a bright room, a viewer's face, a scene behind, etc. are reflected by the hologram surface and blocked from entering the eyes, so that a beautiful reproduced image can be observed.

[0015]

First, the concept of the present invention will be described. In the conventional reproducing apparatus, the display hologram is installed so that the perpendicular direction of the hologram surface substantially coincides with the front direction. For this reason, the light that has entered the hologram from the direction near the front face that is not blocked by the light shield is reflected almost in front and enters the eyes of the observer.

When the display hologram is installed so that the perpendicular direction of the hologram surface is at an angle inclined from the front direction, the light reflected by the hologram surface and emitted near the front is only about twice the inclination angle of the hologram. Since the light is incident on the hologram surface from the vicinity of the oblique direction inclined from the front, it can be blocked by using a suitable light shielding plate.

Therefore, in the present invention, a display hologram that allows a reproduced image to be observed from a direction near the front when installed in a tilted state is used in a tilted state, and the hologram surface is placed on the viewing side. By arranging a light-shielding plate that blocks the light incident from the vicinity of the direction tilted from the front by an angle that is almost twice the tilt angle, the observer's face and the back scene are reflected on the hologram surface and the eyes are reflected. It is possible to obtain a display device in which it is easy to observe a beautiful reproduced image without entering the display device.

An embodiment of the present invention based on the above concept will be described below in detail with reference to the drawings.
FIG. 1 is a side view showing an example of the overall configuration of a display device according to the present invention. In addition, in FIG. 1, a case where a reflection hologram (rainbow hologram) is used as a display hologram will be described as an example.

That is, as shown in FIG. 1, the display device of the present embodiment is installed so that the direction perpendicular to the hologram surface is inclined by a first predetermined angle a with respect to the front direction, and the display device is arranged with respect to the hologram surface. A reflection hologram (a rainbow hologram in this example) 1 which is a display hologram produced so that a reproduced image can be observed from a direction near the front when reproduced with illumination light at a second predetermined angle b that is almost parallel. An illumination light source (in this example, a light source that emits white parallel light) 2 that illuminates the reflection hologram 1 with the light of the second predetermined angle b, and an observation light source side of the reflection hologram 1 that is located near the front surface. A brand-shaped light-shielding body 3 which allows only light in the direction of light to pass through and blocks light in a direction inclined by about twice the first predetermined angle a from the front direction,
The reflection hologram 1, the illumination light source 2, and the support base 4 that supports the light shield 3 are integrally formed.

Here, as the first predetermined angle (angle of inclination of the normal to the hologram surface with respect to the front direction) a, the light passing through the light shield 3 is reflected by the surface of the reflection hologram 1 and does not reach the observer. It should be an angle. That is, 5
Angles in the range of 25 degrees, more preferred 10-2 in this example
The angle is in the range of 0 degrees.

Further, the second predetermined angle b is an angle in the range of 65 to 85 degrees from the perpendicular of the hologram surface, and in this example, a more preferable angle is 70 to 80 degrees. The reason why the first predetermined angle (inclination angle of the perpendicular direction of the hologram surface with respect to the front direction) a is in the range of 5 to 25 degrees is as follows.

That is, when the tilt angle a becomes large, the installed reflection hologram 1 takes up a space in the depth direction, so that the display device itself becomes large, and the reflection hologram 1 is displayed by the illumination light source 2 which is almost parallel. By reproducing, the effect of downsizing the device is lost. Therefore, as an angle that does not impair the miniaturization of the device,
The angle is preferably 25 degrees or less.

On the other hand, if the inclination angle a is made too small, the angle range of the light that can be transmitted by the light shield 3 must be made small, and the range in which the hologram reproduced image can be observed becomes narrow. It is desired that the reproduced image of the hologram can be observed at 40 degrees or more (in the case of the rainbow hologram shown in this example, the spectrum spreads at an angle of about 40 degrees centering on the front direction). In order to set the angle range of 40 degrees or more, the inclination angle of the reflection hologram 1 is preferably 5 degrees or more.

From such a point of view, it is suitable to set the inclination angle a of the perpendicular direction of the hologram surface with respect to the front direction in the range of 5 to 25 degrees. FIG. 2 is a schematic diagram showing a configuration example of an optical system for producing the reflection hologram 1.

First, using an optical system as shown in FIG.
A reflection type rainbow hologram is recorded on the dry plate 9. That is, the laser beam emitted from one laser light source (not shown) is split into two lights by the spectroscope 10.

One of the lights is reflected by the mirror 11 and then spread by the objective lens 12, becomes parallel light by the lens 13 and illuminates the master hologram 14, is diffracted by the master hologram 14, and then slits 15. It passes through and reaches the dry plate 9 as an object light from an oblique direction (in this example, an angle in the range of 10 to 20 degrees from the perpendicular of the dry plate surface).

The other light is reflected by the mirror 16 and then spread by the objective lens 17, becomes parallel light by the lens 18, and becomes an oblique angle to the dry plate 9 (in this example, a perpendicular line to the surface of the dry plate 9). From 70 to 80 degrees) to the dry plate 9 as reference light.

Then, a rainbow hologram is recorded on the dry plate 9 by the interference of the two lights of the object light and the reference light. At this time, a reflection hologram (rainbow hologram) 1 is obtained by forming a reflective layer on the surface of the dry plate 9 by using a material such as a photoresist that records the light intensity with unevenness on the surface.

Here, the angle in the direction of the slit 15 through which the object light passes with respect to the vertical direction of the dry plate 9 is the inclination of the hologram surface perpendicular to the front direction in the reflection hologram 1 used in FIG. It is important that the angle be the same.

In addition, the angle of the reference light is set as 90 degrees as close as possible to 90 degrees within the range where the adverse effect due to reflection does not occur.
An angle of ~ 80 degrees is used. Next, the operation of the display device of this embodiment configured as described above will be described.

An image is reproduced by the system as shown in FIG. 1 using the reflection type hologram (rainbow hologram) 1 produced as shown in FIG. In the case of the reflection type hologram 1 produced by the optical system as shown in FIG.
For this, a light source that emits white parallel light is used, and the angle at which the reflection hologram 1 is reproduced is set to the same angle as the direction in which the reference light is reflected by the surface of the dry plate 9 during hologram recording.

With this arrangement, the reproduced image can be observed from the same direction as the angle of the direction of the slit 15 with respect to the vertical direction of the dry plate 9 at the time of photographing, with respect to the perpendicular direction of the hologram surface. As shown in a), a clear reproduced image can be observed from the front side without being blocked by the light shield 3.

On the other hand, since the light reflected by the hologram surface and emitted near the front becomes light incident on the hologram surface from the vicinity of the oblique direction tilted from the front by an angle twice the tilt angle of the reflection hologram 1. As shown in FIG. 3 (b), a direction in which only light in the vicinity of the front face disposed on the viewing surface side of the reflection hologram 1 passes and is inclined from the front face by about twice the first predetermined angle a. The light is blocked by the blind-shaped light-blocking body 3 that blocks the light. Therefore, even when observing an image in a bright room, the observer's face, the scene behind, etc. are reflected by the hologram surface and enter the eyes. Never.

That is, a reflector hologram (rainbow hologram) which is installed so that the perpendicular direction to the hologram surface is inclined by a first angle a with respect to the front direction and the reproduced image can be observed from the direction near the front ) 1
And an illumination light source (in this example, a light source that emits white parallel light) that illuminates the reflection hologram 1 at an angle corresponding thereto.
And a blind-shaped light shield 3 that allows only light in the vicinity of the front to pass through and blocks light in a direction inclined by about twice the inclination angle of the reflection hologram 1 from the front. Therefore, a beautiful reproduced image can be observed without being disturbed by the reflection of the observer's face or the scene behind.

As a result, even when observing a reproduced image in a bright room, a display device capable of observing a beautiful reproduced image without being obstructed by the reflection of the observer's face or the scene behind is provided. Obtained and extremely useful for three-dimensional displays.

As described above, in the display device of this embodiment, the direction perpendicular to the hologram surface is at the first predetermined angle (the light passing through the light shield 3 is reflected on the surface of the reflection hologram 1 with respect to the front direction). A second predetermined angle (70 to 80 degrees from the perpendicular to the hologram surface) which is installed so as to incline by an angle of 10 to 20 degrees so that it does not reach the observer and is almost parallel to the hologram surface. And a second reflection hologram (a rainbow hologram in this example), which is a display hologram produced so that a reproduced image can be observed from a direction near the front when reproduced with the illumination light.
Illumination light source (in this example, a light source that emits white parallel light) that illuminates the reflection hologram 1 with light having a predetermined angle b
And a brand which is arranged on the observation surface side of the reflection hologram 1 and allows only the light in the direction near the front to pass through and blocks the light in the direction inclined from the front by about twice the first predetermined angle a. -Shaped light shield 3 and these reflection holograms 1,
The illumination light source 2 and the support base 4 that supports the light shield 3 are integrally configured.

Therefore, since the reflection hologram 1 is installed so as to have an angle inclined from the front direction in the direction perpendicular to the hologram surface, the light reflected by the hologram surface and emitted near the front is reflected hologram 1. Since the light is blocked by the light shield 3 disposed on the observation surface side, the observer's face, the scene behind, etc. are not reflected on the hologram surface and do not enter the eyes, and a beautiful reproduced image can be observed.

As a result, even when the reproduced image is observed in a bright room, it is possible to observe a beautiful reproduced image without being disturbed by the reflection of the observer's face or the scene behind.

[0039]

As described above, according to the present invention, the direction perpendicular to the hologram surface is the first with respect to the front direction.
And a display hologram in which a reproduced image is observed from a direction near the front when reproduced with illumination light at a second predetermined angle that is substantially parallel to the hologram surface. An illumination light source that illuminates the display hologram with light of an angle, and a direction that is arranged on the viewing surface side of the display hologram and allows only light in the direction near the front to pass therethrough and is inclined from the front direction by about twice the first predetermined angle. Is integrated with a blind-shaped light-shielding body that shields the light, and the first predetermined angle is set such that the light passing through the light-shielding body is not reflected by the surface of the display hologram to reach the observer. Therefore, even when observing a reconstructed image in a bright room, it is possible to observe a beautiful reconstructed image without being obstructed by the reflection of the observer's face or the scene behind. Spray apparatus can be provided.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing a configuration example of an optical system for producing a reflection hologram in the example.

FIG. 3 is a schematic diagram for explaining how the display device is observed in the example.

FIG. 4 is a side view showing a configuration example of a conventional display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reflective hologram, 2 ... Illumination light source, 3 ... Blind-shaped light shield, 4 ... Support base, 5 ... Reflective hologram, 6 ... Illumination light source, 7 ... Blind-shaped light shield, 8 ... Support base, 9 ... Dry plate, 10 ... Spectroscope, 11 ... Mirror, 12 ... Object lens, 13 ... Lens, 14 ... Master hologram, 15 ... Slit, 16 ... Mirror, 17 ... Objective lens, 18 ... Lens.

Claims (3)

[Claims] 1. A vertical line with respect to the hologram surface is installed so as to be inclined by a first predetermined angle with respect to the front direction,
When reproduced with illumination light at a second predetermined angle that is substantially parallel to the hologram surface, a display hologram in which a reproduced image is observed from a direction near the front surface, and the display hologram is displayed by the light at the second predetermined angle. An illumination light source for illuminating and a light source arranged on the viewing surface side of the display hologram to allow only light in the direction near the front surface to pass therethrough and block light in a direction inclined by about twice the first predetermined angle from the front direction. A blind-shaped light shield is integrated with the first predetermined angle, and the first predetermined angle is set such that the light passing through the light shield is not reflected on the surface of the display hologram to reach an observer. Characterized display device. 2. The display device according to claim 1, further comprising a support base that supports the display hologram, the illumination light source, and the light shield. 3. The first predetermined angle is an angle in the range of 10 to 20 degrees from the front direction of the hologram surface, and the second predetermined angle is 70 to 70 from the perpendicular surface of the hologram surface. The display device according to claim 1 or 2, wherein the display device has an angle in a range of 80 degrees.