JP2003050533A - Hologram reflector plate and liquid crystal display device using this reflector plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the design characteristics of merchandise and to achieve differentiation by adding a function to project the image patterns recorded to a hologram reflector plate to a wall surface, etc., in addition to a function to brighten the hologram reflector plate. SOLUTION: This hologram reflector plate has a hologram used for forming display patterns by reflecting incident light to a prescribed direction and in a prescribed range. The hologram described above is a volume phase transmission type hologram having a reflection layer on the back and is recorded with image shapes so as to condense the light thereof to an illumination light source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram reflector having a function of projecting an image pattern, and a liquid crystal display device using the hologram reflector.

[0002]

2. Description of the Related Art A conventional hologram reflector is used for brightly displaying a pattern displayed on a liquid crystal, and is arranged on the back surface of the liquid crystal so that the illumination light from the front surface is efficiently emitted to an observer. It is used in the display device.

[0003]

As described above, the conventional hologram reflection plate has been used to efficiently emit the illumination light. The hologram reflector of the present invention has a function of projecting a recorded image pattern on a wall surface or the like in addition to these brightening functions, thereby enhancing designability and incorporating the hologram reflector into a product. , To improve the design of products and to differentiate products.

[0004]

[Means for Solving the Problems]

According to a first aspect of the present invention, there is provided a hologram reflector having a hologram used for forming a display pattern by reflecting incident light in a predetermined direction and in a predetermined range. And a hologram reflection plate characterized in that an image shape is recorded so as to be condensed on an illumination light source. Since the image shape is recorded so as to be focused on the position of the illumination light source in this way, the image shape is not observed in a normal state, and the image shape can be recognized only after illumination by the illumination light source.

According to a second aspect of the present invention, the hologram comprises reference light used for recording diffused light from a diffuser screen having a desired image shape, and diffused light from the diffuser screen having no image shape. And the reference light used for recording
The hologram reflection plate according to claim 1, wherein multiple recording is performed so that respective incident angles are orthogonal to each other. When recording a hologram in this way, the reference light used for recording diffused light from the diffuser screen having an image shape and the reference light used for recording diffused light from the diffuser screen having no image shape are incident. By making the angles orthogonal to each other, it is possible to recognize the image shape by emitting bright reflected light and illuminating light when necessary.

According to a third aspect of the present invention, the reflection layer provided on the hologram has a specular reflection surface formed by providing a reflective metal vapor deposition layer on the surface of a support having a flat surface. The hologram reflector according to claim 1 or claim 2.

According to a fourth aspect of the present invention, the hologram reflection plate is a film in which a hologram and a reflection layer are laminated and integrated via an adhesive layer.
The hologram reflector according to any one of claims 1 to 3.

The invention according to claim 5 is characterized in that the hologram reflector is provided with a polarizing layer on the surface opposite to the reflecting layer of the hologram. The hologram reflection plate described in the item.

The invention described in claim 6 is characterized in that the polarizing layer of the hologram reflection plate described in claim 5 is integrated so as to be located on the surface (rear surface) of the liquid crystal panel opposite to the viewer. It is a liquid crystal display device.

The invention according to claim 7 is the liquid crystal display device according to claim 6, wherein the liquid crystal panel and the hologram reflection plate are integrated via an adhesive layer.

The invention according to claim 8 is the liquid crystal display device according to claim 6 or 7, characterized in that a mechanism for illuminating with a semiconductor laser is provided from the front surface of the liquid crystal panel.

The invention according to claim 9 is the liquid crystal display device according to claim 6 or 7, characterized in that a mechanism for illuminating with an LED is provided from the front surface of the liquid crystal panel.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an optical system for photographing a volume phase transmission type hologram when making a hologram reflector of the present invention. The laser beam emitted from the laser (1) is reflected by the mirror (2),
It is split into two directions by the beam splitter (3).
The one branched laser beam (R1) is reflected by the mirror (4) and expanded by the lens (5) into a spherical wave, and the reference light (6) is reflected at an angle (θ1) where the incident angle selectivity is desired. ) Is applied to the photosensitive material (7).

The other laser beam (R2)
Is reflected by a mirror (8), spread by a lens (9) into a spherical wave, and enters a Fresnel lens (10). The Fresnel lens (10) is arranged in the region of the photosensitive material (7) in which the hologram is recorded so as to have a focal length for collecting light in a desired shape.

A cross wrench (11) (lens arranged so that the lens directions of the cylindrical lenses are orthogonal to each other) is arranged adjacent to the Fresnel lens (10). The cross wrench (11) is adapted to focus the area focused on the photosensitive material (7) in a rectangular shape.
A diffusion plate (12) made of non-glare glass or the like is arranged adjacent to the cross wrench (11).
Instead of the cross wrench (11) in which the cylindrical lens groups are orthogonal to each other, a lens array in which unit convex lenses are arranged in a matrix may be used.

When a material having a low diffusivity such as non-glare glass is used as the diffusing plate (12), the diffusing property is smaller than that of an ordinary diffusing plate, so that the Fresnel lens (10) and the cross wrench ( By 11), the surface of the light-sensitive material (7) is irradiated with a wavefront that is condensed and is squarely condensed as the object light (13) at an angle (θ2) where it is desired to have diffraction directivity. Further, when light is condensed by the Fresnel lens (10) and the cross wrench (11) without the diffusion plate (12), the intensity distribution of the cross wrench (11) causes the light distribution on the surface of the photosensitive material (7). Brightness stripes are recorded.

However, as described above, by inserting the diffusing plate (12) having a diffusing property such as non-glare glass, this intensity distribution is averaged and the brightness of the entire surface is made uniform.

FIG. 2 shows a conventional method generally used.
FIG. 6 is an explanatory diagram showing a positional relationship between a hologram and a diffuser screen, showing a method for producing a volume phase transmission type hologram reflection plate. The photosensitive material (21) is irradiated with the reference light (22) and the object light (25) from the diffuser screen (24) arranged at the position of the screen distance (23) to record these interference fringes. To do.

FIG. 3 shows a method of manufacturing a volume phase transmission type hologram reflection plate which is an embodiment of the present invention, and is an explanatory view showing a positional relationship between a hologram and a diffusion plate screen. The light-sensitive material (31) is irradiated with the reference light (32), and at the same time, the diffuser screen (34) in which the image shape is open
Is arranged at the position of the screen distance (33), and the object light (35) from this diffuser screen (34) is irradiated to record these interference fringes.

By the way, as a reflector for reflecting light on the back surface of a normal liquid crystal display, a rectangular diffusion screen (24) having a large area as described in FIG. 2 is used. However, the diffusing plate screen (34) in FIG. 3 records only a small area that is shielded by the image-shaped mask. When observing a hologram reflection plate recorded on a screen with such an image shape, only the image shape part seems to shine, the viewing area becomes very narrow, and it looks flickering and is not suitable for observing liquid crystal patterns. .

Therefore, the reflector for observing the liquid crystal display is separately recorded with the structure as shown in FIG.
With such a configuration, the image shape is formed by multiple recording or by recording separately recorded images.

Here, specifically, the reference light (32) for recording in FIG. 3 has an incident angle that is orthogonal to the reference light (22) shown in FIG. 2, and is shown in FIG. Recording is performed with light such that the light is focused on the position of the semiconductor laser (42) which is the illumination light source. By recording in this way, at the incident light angle when normally observing the liquid crystal, reproduction light is not emitted from the hologram in which the image shape is recorded, a real image of the image is not reproduced, and observation of the liquid crystal display is not hindered.

FIG. 4 is an explanatory view showing a positional relationship between a hologram in which a volume phase transmission type hologram reflection plate which is one embodiment of the present invention is irradiated with illumination light and a real image of an image is projected, and a diffusion plate screen. .

By irradiating the hologram reflection plate (41) recorded in FIG. 3 with laser light from the semiconductor laser (42) which is an illumination light source, the screen distance (4
At the position 3), the real image (44) on the screen is reproduced by the reproduction light (45). An image is projected by placing a screen at this reproduction position.

FIG. 5 shows the structure of a volume phase transmission type hologram reflection plate which is an embodiment of the present invention. Here, the hologram reflection plate generally has a structure in which a metal reflection layer (59) is provided on the back surface of the hologram layer (57) via an adhesive layer (58). The metal reflection layer (59) is a structure in which a metal vapor deposition layer is provided on one surface of a plastic film. Further, it is preferable that the metal reflection layer (59) has a mirror-finished state because of high reflection efficiency.

In addition to the above, the hologram reflector is
A polarizing layer (55) may be provided on the surface of the hologram (57) opposite to the metal reflection layer (59) via an adhesive layer (56). And when making a liquid crystal display,
The hologram reflection plate having the polarizing layer is provided on the back surface of the liquid crystal panel (53) via the adhesive layer (54). Needless to say, the polarizing layer (52) is also provided on the front surface of the liquid crystal panel (53).

FIG. 6 shows an embodiment in which the volume phase transmission type hologram reflection plate of the present invention is incorporated in a timepiece. Watch (6
A semiconductor laser illuminator is installed inside 1),
By irradiating the hologram reflection plate on which the image shape is recorded with laser light, the image shape (6
3) can be projected.

Here, when illuminated by an LED other than a semiconductor laser, the image is slightly unclear, but can be sufficiently identified unless it has a fine image shape. As described above, when the image shape is not fine, it is also effective to use LED illumination instead of the semiconductor laser as the illumination device.

In addition to the built-in timepiece as in the above-mentioned embodiment, by incorporating it in a portable game machine, it is possible to project a pattern in accordance with the contents of the game. Available. In this case, a more reliable image projection can be achieved by incorporating a projection screen into the device in an integrated manner.

[0031]

As described above, according to the present invention, since the image shape is recorded so as to be focused on the position of the illumination light source, the image shape is not observed in a normal state, and it is necessary to illuminate with the illumination light source. Since the image shape can be recognized, when observing the image on the liquid crystal panel, the image shape does not interfere and can be displayed only when necessary.

Further, since the hologram is recorded by making the incident angles of the reference light in the case of the diffuser screen having the image shape and the reference light in the case of the diffuser screen not having the image shape orthogonal, When used as
Bright reflected light can be obtained in the liquid crystal display device, and the image shape can be recognized by illuminating light when necessary.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an optical system for photographing a volume phase transmission hologram having an image shape used in the present invention.

FIG. 2 is an explanatory view showing a method for producing a general volume phase transmission hologram reflection plate.

FIG. 3 is an explanatory diagram showing an example of a method for producing a volume phase transmission hologram reflection plate of the present invention.

FIG. 4 is an explanatory view showing a projection example of the hologram reflection plate of the present invention.

FIG. 5 is a configuration diagram showing an example of a hologram reflection plate of the present invention.

FIG. 6 is an explanatory diagram showing an example of a liquid crystal display device of the present invention.

[Explanation of symbols]

1 ... Laser 2, 4, 8 ... Mirror 3 ... Beam slitter 5, 9 ... Lens 6, 22, 32 ... Reference light 7, 21, 31 ... Photosensitive material 10 ... Fresnel lens 11 ... Cross wrench 12 ... Diffuser 13, 25, 35 ... Object light 23, 33, 43 ... Screen distance 24, 34 ... Diffuser screen 41 ... Reflector 42 ... Semiconductor laser 44 ... Real image 45 ... Playback light

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G03H 1/04 G03H 1/04 1/18 1/18

Claims (9)

[Claims] 1. A hologram reflection plate provided with a hologram used to form a display pattern by reflecting incident light in a predetermined direction and in a predetermined range, wherein the hologram has a reflective layer on the back surface. The hologram reflection plate is characterized in that the image shape is recorded so as to be focused on the illumination light source. 2. The hologram comprises reference light used for recording diffused light from a diffuser screen having a desired image shape and reference light used for recording diffused light from a diffuser screen having no image shape. 2. Multiple recording is performed so that the respective incident angles are orthogonal to each other.
The hologram reflector described. 3. The reflection layer provided on the hologram has a specular reflection surface formed by providing a reflective metal vapor deposition layer on a surface of a support having a flat surface. Hologram reflector. 4. The hologram according to claim 1, wherein the hologram reflection plate is a film in which a hologram and a reflection layer are laminated and integrated via an adhesive layer. a reflector. 5. The hologram reflection plate according to claim 1, wherein the hologram reflection plate is provided with a polarizing layer on a surface of the hologram opposite to the reflection layer. . 6. The surface (rear surface) of the liquid crystal panel opposite to the observer,
A liquid crystal display device, wherein the hologram reflector according to claim 5 is integrated so that the polarizing layer is positioned. 7. The liquid crystal panel and the hologram reflection plate,
The liquid crystal display device according to claim 6, wherein the liquid crystal display device is integrated through an adhesive layer. 8. The liquid crystal display device according to claim 6, further comprising a mechanism for illuminating with a semiconductor laser from the front surface of the liquid crystal panel. 9. The liquid crystal display device according to claim 6, further comprising a mechanism for illuminating with an LED from the front surface of the liquid crystal panel.