JP2000298312A - Rear projection type image display - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a rear-projection display device whose depth can be made extremely small. SOLUTION: A screen 14, an optical unit 16 for generating light of an image source, and a hologram optical layer 70 for red color.
And a non-specular reflection type optical element 20 constituted by laminating a green hologram optical layer 71 and a blue hologram optical layer 72, which are arranged in the optical path between the optical unit and the screen. A non-specular reflection optical element 20 for receiving the generated light, reflecting the light at a reflection angle different from the incident angle of the light, projecting the light from the back side of the screen 14 and displaying an image on the screen 14; Is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection type image display apparatus for projecting light from the rear side of a screen to display, for example, a color image.

[0002]

2. Description of the Related Art In recent years, with the spread of multimedia devices and personal computers, the market of projection display devices capable of large-size display has been expanding. In recent years, liquid crystal projectors composed of light modulating means such as a liquid crystal panel and optical components such as a light source and a projection lens have become widespread as television receivers and display devices for presentations using personal computers. .

[0003] As a product form of a liquid crystal projector, as shown in FIGS.
And a screen 1010 are separated from each other.
001 and a rear projection display device in which a screen 1010 is arranged together. In the case of the front projection type shown in FIG. 15, a color image emitted from the optical unit 1001 is projected on a screen 1010 on the front, and the observer 10
Reference numeral 12 indicates that a color image on the screen 1010 is viewed from the same direction as the optical unit 1001.

On the other hand, in the case of the rear projection type shown in FIG.
And the screen 1010 are arranged, and the optical unit 10
01 is displayed on the screen 1010
The observer 1012 views the color image on the screen 1010 from the side opposite to the side on which the color image is projected. However, in this arrangement, the optical unit 1
Since the light emitted from 001 is obliquely incident on the screen 1010, a light amount loss on the surface of the screen 1010 occurs. For this reason, at present, as shown in FIG.
After reflecting light from No. 1, the light is projected on the screen 1010.

[0005]

However, such a conventional rear projection display device has the following problems. That is, since the optical unit 1001 and the reflection mirror 1013 are arranged so as to be optically optimal, it is necessary to set the depth of the cabinet 1011 to some extent, and the installation location of the rear projection display device is limited. In some cases, problems such as accidents occurred.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a rear projection display device in which the depth of a cabinet can be made extremely small.

[0006]

According to the present invention, a screen, an optical unit for generating light of an image source, a hologram optical layer for red, a hologram optical layer for green and a hologram optical layer for blue are provided. A non-specular reflection type optical element configured by laminating, disposed in the optical path of the optical unit and the screen, incident light generated by the optical unit, and the angle at which the light is incident A non-specular reflection type optical element that reflects the light at different reflection angles, projects the light from the back side of the screen, and displays an image on the screen, Device.

In the first aspect, the non-specular reflection type optical element is formed by laminating a hologram optical layer for red, a hologram optical layer for green, and a hologram optical layer for blue. The non-specular reflection optical element receives light generated by the optical unit, reflects the light at a reflection angle different from the incident angle, projects the light from the rear side of the screen, and displays the image on the screen. To be displayed. Thereby, in the rear projection type image display device using the entire visible light range, the entire visible light range can be projected on the back side of the screen to display an image on the screen. In addition, the non-specular reflection type optical element can reflect light at a reflection angle different from the incident angle and project the light on the screen side. Therefore, the non-specular reflection type optical element is disposed between the screen and the optical unit and the optical path formed by them. By selecting the arrangement of the reflective optical elements, the size of the rear projection type image display device in the depth direction can be reduced, and the size of the device can be reduced.

According to a second aspect of the present invention, in the rear projection type image display device according to the first aspect, the red hologram optical layer, the green hologram optical layer, and the blue hologram optical layer of the non-specular reflection optical element are provided. Are laminated with a transparent substrate interposed therebetween. According to the second aspect, since the hologram optical layers are laminated with the transparent substrate interposed therebetween, the transparent substrate maintains the strength of each hologram optical layer and prevents the optical distortion of each hologram optical layer from occurring. Can be removed.

According to a third aspect of the present invention, in the rear projection type image display device according to the second aspect, the red hologram optical layer, the green hologram optical layer, and the blue hologram optical layer of the non-specular reflection optical element are provided. Is a phase-type hologram optical layer. In the third aspect, a phase type hologram optical layer is used. Holograms include amplitude type holograms and phase type holograms, but phase type holograms are more efficient in terms of diffraction (reflection) efficiency, so it is preferable to use phase type holograms as non-specular reflection optical elements. High reflectivity can be expected.

According to a fourth aspect of the present invention, in the rear projection type image display device according to the second aspect, the red hologram optical layer, the green hologram optical layer, and the blue hologram optical layer of the non-specular reflection optical element are provided. Is formed on a transparent film, and the transparent film and the transparent substrate are bonded to each other. According to the fourth aspect, the hologram optical layer is formed on the transparent film. As will be described later, the hologram optical layer is produced through a process of coating, exposing, and developing a photosensitive agent. At this time, the transparent film is formed into a roll, and the above-described production process is introduced in a process of winding from roll to roll. Thereby, a hologram optical layer can be manufactured continuously. For this reason, productivity is remarkably improved, and as a result, cost reduction can be expected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a perspective view showing a preferred embodiment of a rear projection type display device according to the present invention, and FIG. 2 is a side view showing an internal structure of the rear projection type display device. The rear projection display device 10 includes a main body 12, a screen 14, an optical unit 16, and a non-specular reflection optical element 20.
The screen 14 is arranged corresponding to the opening 12 </ b> A of the main body 12. The main body 12 is a cabinet, and is made of, for example, plastic. An optical unit 16 is set on the inner bottom surface of the main body 12. The optical axis OP of the optical unit 16 is oriented vertically. A non-specular optical element 20 is disposed between the optical path formed in relation to the optical unit 16 and the screen 14. The non-specular reflection type optical element 20 is fixed in parallel to the inside of the inclined back surface 22 of the main body 12. The non-specular reflection optical element 20 is disposed opposite the screen 14, but the screen 14 and the non-specular reflection optical element 20 are not parallel. The optical unit 16 is an image source. The light L generated by the optical unit 16 is reflected by the non-specular reflection type optical element 20 and then reflected by the rear surface 14 of the screen 14.
By projecting on A, for example, a color image is formed and displayed on the screen 14.

FIG. 3 shows a typical optical configuration example of the optical unit 16 shown in FIG. This optical unit 1
6 has a housing 30, in which the housing 30 includes:
The following optical components are arranged. The optical unit 16 is a so-called three-panel type liquid crystal projector having three liquid crystal panels.
2. Cut filter 33 for ultraviolet and infrared rays, 2 sets of multi-lens array (MLA) 34, convex lens 35, dichroic mirrors 36, 37, mirrors 38, 39, 40, convex lenses 41, 42, 43, liquid crystal panel 44, 45, 46, a cross prism 47, a projection lens 48, and the like. As the light source 2, for example, a metal halide lamp or a halogen lamp can be used. The light emitted from the light source 32 passes through the ultraviolet and infrared cut filters 33, then passes through the multi-lens array 34 and the convex lens 35, and is made uniform.

Subsequently, the light is separated by the dichroic mirror 36 into blue (B) light, red (R) and green (G). After being reflected by the mirror 39, the blue light enters the liquid crystal panel 46 through the convex lens 43 and enters the cross prism 46.

On the other hand, the red light and the green light are reflected by a dichroic mirror 36 and then separated by a dichroic mirror 37, and the green light is reflected by a convex lens 42 on the liquid crystal panel 4.
The light enters the cross prism 47 through 5. The red light is reflected by the mirrors 38 and 40 and enters the liquid crystal panel 44 and the cross prism 47 by the convex lens 41. As a result, the blue, green and red lights are respectively modulated by the liquid crystal panels 46, 45 and 44, and then combined again by the cross prism 47. The combined color image is projected by the projection lens 48. The image is projected on the rear surface 14A side of the projection screen 14.
Since the three liquid crystal panels 46, 45, and 44 are used as described above, the projection type image display device of this embodiment is called a so-called three-panel type liquid crystal projector.

FIG. 4 shows the non-specular reflection type optical element 2 shown in FIG.
0 shows a configuration example. This non-specular reflection type optical element 20
Is also called a functional mirror and has the following configuration. The non-specular reflection type optical element 20 includes, for example, three transparent substrates 60, 61, and 62, a hologram optical layer 71 for red (R), a hologram optical layer 71 for green (G), and a hologram optical layer 71 for blue (B). Is a laminate in which the hologram optical layers 72 are laminated.

A hologram optical layer 70 for R is formed on one surface of the transparent substrate 60, a hologram optical layer 71 for G is formed on one surface of the transparent substrate 61, and a hologram optical layer 71 is formed on the transparent substrate 62. The hologram optical layer 72 for B is formed on one surface. Nothing is formed on the other surface of the transparent substrate 60, but the hologram optical layer 70 for R is tightly fixed to the other surface of the transparent substrate 61. Similarly, a hologram optical layer 71 for G is adhered and fixed to the other surface of the transparent substrate 62. Transparent substrates 60, 6
It is desirable that the first and second members are made of a transparent material as much as possible. It is preferable to use a glass plate for the lowermost transparent substrate 60 in consideration of supporting rigidity.
1, 62 may be a glass plate or a resin film having a slightly lower supporting rigidity than the glass plate. When the transparent substrates 61 and 62 are made of a resin film, for example, a material such as acrylic or polycarbonate can be adopted.

A non-specular reflection type optical element 20 as shown in FIG.
When the transparent substrates 60, 61, 62
Hologram optical layer 70 for R, hologram optical layer 71 for G, and hologram optical layer 72 for B
Is formed, the transparent substrates 60, 61, and 62 may be stacked.

FIG. 5 shows another example of the non-specular reflection type optical element 20 shown in comparison with FIG. In the example of FIG. 5, hologram optical layers 70, 71, 72 for R, G, and B are directly laminated on one transparent substrate 61. In the case of the laminated structure as shown in FIG. 5, after forming the hologram optical layer 70 for R, the hologram optical layer 7 for G
The hologram optical layers 72 for 1 and B are formed in order. In such a production process, a swelling operation is required. The swelling operation is intended to increase the width of the wavelength of light diffracted and reflected by the hologram optical layer by widening the interval between interference fringes formed in the hologram optical layer, and usually, xylene or the like. Dipping in a highly polar organic solvent for a predetermined time and drying. The lowermost hologram optical layer 70 for R receives three swelling operations, and the hologram optical layer 71 for G receives two swelling operations. When the swelling operation is performed a plurality of times as described above, the spectrum of the hologram optical layer may become extremely broad (wide area) or disappear.

In order to avoid this, it is preferable that the hologram optical layers 70, 71, 72 are formed on the transparent substrates 60, 61, 62, respectively, and then stacked, as shown in FIG. However, if no disadvantage occurs in the hologram optical layer even after such swelling operation is performed a plurality of times, it is of course possible to adopt the structure of the non-specular reflection optical element 20 having the structure as shown in FIG. It is.

The reason why the three types of hologram optical layers 70, 71 and 72 for R, G and B are laminated to constitute the non-specular reflection type optical element 20 is that This is because it is necessary to reflect the light L from the optical unit 16 in the entire visible light range and project the light L on the back surface 14A of the screen 14 to display a color image. Since the hologram optical layer is usually formed by exposing with the single wavelength light λ0 shown in FIG. 6 such as a laser beam, the diffraction efficiency of the completed hologram becomes the maximum efficiency with the single wavelength light λ0. Hardly diffracts light of other wavelengths.

However, the rear projection type display device 10 of the present invention
In this case, since the entire visible light range of the light L of the optical unit 16 is used, color display cannot be performed with the optical characteristics of the hologram optical layer of FIG. Therefore, the non-specular reflection type optical element 2
Numeral 0 has a structure in which hologram optical layers as shown in FIG. 4 or FIG. 5 are laminated. Thereby, optical characteristics as shown in FIG. 7 different from FIG. 6 are provided.

When the laminated structure of the hologram optical layers as shown in FIG. 4 or FIG. 5 is adopted, the blue (B) band of which the diffraction center wavelength is λB, the green (G) band of λG, as shown in FIG. Then, a red (R) band of λR is formed.

Next, the hologram optical layer as shown in FIG. 4 or FIG. 5 is immersed in a highly polar organic solvent such as xylene to form hologram optical layers 70, 71 and 72, respectively.
Swell. By doing so, as shown in FIG. 7B, the interval between the interference fringes formed in the hologram optical layers 70, 71, and 72 is increased, and the diffraction efficiency (%) is 10%.
The region of 0% spreads with respect to the diffraction center wavelengths λB, λG, and λR, respectively, resulting in a broad spectrum. Thereby, the non-specular reflection type optical element 20
Can reflect light in almost the entire visible light range.

As shown in FIG. 8, each of the hologram optical elements 70, 71, 72 is composed of one transparent substrate 60, 6
1, 62 can be formed directly on the surface. The hologram optical layers 70, 71, 72 are so-called phase hologram optical elements, for example, volume phase hologram optical elements. Such a hologram optical layer 70
Is composed mainly of a photosensitive material, for example, a matrix of polyvinyl carbazole, and EO as a monomer.
Modified tribromophenoxyethyl acrylate and isocyanuric acid skeleton triacrylate, 2,4,6
-Tris (trichloromethyl) -s-triazine, and those to which a squarylium dye is added as a sensitizing dye.

The hologram optical layer 71 is mainly composed of a photosensitive material, for example, having a matrix of polyvinyl carbazole, EO-modified tribromophenoxyethyl acrylate and isocyanuric acid skeleton triacrylate as monomers, and 2,4,4 as initiators. Examples include 6-tris (trichloromethyl) -s-triazine, and those to which a squarylium-based dye is added as a sensitizing dye.

The hologram optical layer 72 is mainly composed of a photosensitive material, for example, using polyvinyl carbazole as a matrix, EO-modified tribromophenoxyethyl acrylate and isocyanuric acid skeleton triacrylate as monomers, and 2,4,4 as initiators. Examples include 6-tris (trichloromethyl) -s-triazine, and those to which a squarylium-based dye is added as a sensitizing dye.

In addition to the example of forming the hologram optical layer as shown in FIG. 8, there is also a forming method as shown in FIG. That is,
The hologram optical layers 70, 71, 72 are previously formed on a transparent film 90 as a joining material, and the hologram optical layers 70, 71, 7 formed on the film 90 are formed.
2 can be of course formed by bonding to the corresponding transparent substrates 60, 61, 62. In this case, as the transparent film, a transparent resin film can be adopted, and any material can be used as long as it is transparent in the visible light region.
ET (polyethylene terephthalate) or the like can be employed. When the transparent film 90 is attached to the transparent substrates 60, 61, and 62, an adhesive, a photocurable adhesive such as ultraviolet light or visible light, or a thermosetting adhesive that is cured by heating or the like is used. It is also possible.

FIG. 10 shows an example of a method for manufacturing a hologram optical layer of a non-specular reflection optical element. Transparent substrate 60
(61, 62) is thoroughly washed with an organic solvent such as alcohol or acetone, degreased, rinsed with pure water and dried. Then, on the transparent substrate 60 (61, 62), a photosensitive material is applied by a spin coating method, a dipping method, a spraying method, or the like, and dried by wind to produce a dry plate 19.
Subsequently, a dry plate 19 is provided at a predetermined position of the exposure optical system as shown in FIG. 10, and interference fringes are formed on the photosensitive material so as to diffract a predetermined wavelength. Specifically, a light beam emitted from a laser light source 120 such as titanium sapphire or argon is split into two by a beam splitter 121, and then is made into diffused light by each lens group 122. One of the light beams is referred to as object light O, and the other light beam is referred to as reference light R. At a position where the object light O and the reference light R intersect at a desired angle,
A drying plate 19 is provided. The object light O is irradiated through the lens 122 and the reference light R is irradiated into the photosensitive material through the mirror 123 and the lens 122 to form interference fringes.

Finally, the dry plate 19 is successively immersed in a developing solution of methyl isobutyl ketone and heptane and then dried to finally obtain a non-specular reflection type hologram display device having a desired optical characteristic. The optical element is completed.

FIGS. 11 and 12 are diagrams for explaining the principle operation of a non-specular reflection type optical element which is a phase type hologram optical element. A dry plate 1 is provided at an intersection of an optical system arranged such that the reference light R and the object light O shown in FIG.
9 is installed, and when the light from the laser light source is actually irradiated,
The light beams interfere with each other, and a large number of portions where light is strengthened and portions where light is weakened alternately and statically occur in the photosensitive material. In the case of photosensitive materials, polymerization is initiated and accelerated by light irradiation, and since the photosensitive material has the property of increasing the refractive index as the degree of polymerization increases, the high refractive index and low refractive index parts in the photosensitive material are exposed to light. And the parts are formed alternately. These are formed in the photosensitive material as interference fringes, and the interference fringes are fixed by performing the developing process as described above, and are environmentally stable.

When the reproduction light P is irradiated from the same direction as the reference light R, that is, the direction of the angle θ1, to the obtained non-specular reflection type optical element, which is the volume phase type hologram optical element, the object light O is emitted from the hologram optical element. The light having the same direction and angle θ2 as above is obtained as the diffracted light Ref by the interference fringes.

Similarly, as shown in FIG. 13, when a non-inverting optical element, which is a volume phase hologram optical element, is manufactured by using the reference light R and the object light O as diffused light, the reproduction light P becomes the same as the reference light R. By using the diffused light, the interference light Ref is also diffracted as the diffused light as shown in FIG. As described above, the ordinary reflection mirror simply reflects light in the opposite direction at a reflection angle equal to the incident angle of light, whereas the volume phase hologram optical element is used to form interference fringes in the photosensitive material. The direction and attributes of the light reflected and diffracted by the optical system, more specifically, the angle between the reference light R and the object light O, and the parallelism and diffusion of each light are determined. Conversely, by arbitrarily selecting an optical system at the time of exposure in advance, a non-specular reflection optical element that is a volume phase hologram optical element having desired reflection characteristics can be manufactured.

The theoretical details of interference and diffraction of the hologram optical element are described in, for example, Kogelnik's theory (H.
Kogelnik, “Coupled Wave Th
early for Thick Hologram G
ratings ", BellSystem. Tech.,
J. 48, 2909 (1969)).

Normally, light emitted from the optical unit 1 is
As shown in FIG. 1, the optical unit 16 has an angle of view of ± ψ with respect to the center light beam, and the angle of view 決定 is determined by the optical unit 16.
48 is the projection lens shown in FIG. There is a limit to the angle of view 製造 due to the manufacturing cost of the projection lens 48 and the like, and if an attempt is made to increase the size of the projection screen based on this limitation, the projection angle between the optical unit 1001 and the optical unit 1001 as in the conventional apparatus shown in FIG. Screen 10 for
There is no other way but to physically separate the distance from the device. But,
As long as a normal reflecting mirror 1013 having only the function of simply reflecting the light from the optical unit 1001 is used, the projection screen 1010 and the reflecting mirror 101 are used.
3 has to be kept apart, and as a result, the depth D of the rear projection display device becomes considerably large.

On the other hand, in the rear projection type display apparatus of the present invention shown in FIG. 1, the diffused light having the incident angle of the central luminous flux previously incident at θ1 is reflected at the reflection angle of θ2 as shown in FIG. Since the non-specular reflection optical element 20, which is a phase type hologram display element designed and manufactured in this way, is used, even if the optical element 20 is arranged almost parallel to the projection screen 14 and upright, reflected light is as desired. It is directed onto the projection screen 14. Further, since the angle of view 光 of the light emitted from the optical unit 1 can be small, the number of projection lenses can be small, and as a result, the cost can be reduced.

As described above, by using a non-specular reflection type optical element (functional mirror), which is a phase type hologram display element, as a reflection turning reflection plate for a light beam emitted from an optical unit of a rear projection display apparatus, light can be reflected. Since the incident angle and the reflection angle can be designed and manufactured completely independently of each other, the depth of the main body 12 of the device can be reduced as compared with the conventional rear projection display device.

The rear projection type image display device manufactured as described above was evaluated as follows. First, regarding the depth of the main body, the size of the projection screen was the same and compared with a conventional rear-projection image display device in which a simple reflecting mirror was arranged inside, and it was judged that the effect would be effective if it was shorter than that . Further, the display quality displayed on the projection screen was compared with that of the conventional rear projection type image display device by the naked eye, and it was confirmed whether there was any remarkable decrease or difference in quality.

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to the following Examples.

[0040]

COMPARATIVE EXAMPLE 1 An optical unit emitted at an angle of view ψ = 20 ° and a simple reflecting mirror are used. The light emitted from the optical unit is once turned back by the simple reflecting mirror and then projected for a size of 50 inches. We designed and manufactured a rear projection type image display device that can reach the screen. The depth of the rear projection display device was about 50 cm when measured. The angle θ1 at which the central light emitted from the optical unit is incident on the reflecting mirror and the angle θ2 at which the light is reflected were both 36 °.

[0041]

Embodiment 1 An optical unit emitted at an angle of view ψ = 7 ° and a non-specular reflection optical element as a volume phase hologram display element are used, and after the light emitted from the optical unit is folded back by this optical element, We designed and manufactured a rear-projection display device that could reach a 50-inch projection screen. The depth of the rear projection display device was about 30 cm when measured. Further, the image quality displayed on the projection screen was hardly changed as compared with that of the rear projection type image display device shown in Comparative Example 1. The angle θ1 at which the center light emitted from the optical unit is incident on the functional mirror was 70 °, and the angle θ2 at which the light was reflected was 22 °.

In the embodiment of the present invention, the optical unit, the non-specular reflection optical element (functional mirror), and the projection screen are arranged inside, and the non-specular reflection type optical element is composed of a phase hologram display element. By configuring
It is possible to provide a rear-projection display device having an extremely reduced depth. By the way, the present invention is not limited to the above-described embodiment, and various modifications can be adopted. For example, the optical unit 16 shown in FIG.
Although 6, 45, and 44 are employed, the present invention is not limited to this, and can be applied to a single-panel type liquid crystal panel using only one liquid crystal panel. Further, in the rear projection type display device shown in FIG. 2, the optical axis OP of the optical unit 16 may have an angle inclined with respect to the vertical plane.

[0043]

As described above, according to the present invention,
The depth can be made extremely small.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a rear projection display device of the present invention.

FIG. 2 is a side view showing the internal structure of the rear projection display device of FIG.

FIG. 3 is a diagram showing a configuration example of an optical unit.

FIG. 4 is a diagram showing a configuration example of a non-specular reflection optical element.

FIG. 5 is a diagram showing another configuration example of the non-specular reflection type optical element.

FIG. 6 is a diagram showing optical characteristics when the hologram is a single item.

FIG. 7 is a diagram showing optical characteristics when holograms are prepared for B, G, and R.

FIG. 8 is a diagram showing a structural example of a hologram optical layer and a transparent substrate.

FIG. 9 is a diagram showing an example of a structure of attaching a hologram optical layer and a transparent substrate.

FIG. 10 is a diagram showing an example of forming a hologram optical layer.

FIG. 11 is a diagram showing an example of optical characteristics of a hologram optical layer.

FIG. 12 is a view showing an example of optical characteristics of a hologram optical layer.

FIG. 13 is a view showing optical characteristics of a hologram optical layer.

FIG. 14 is a view showing optical characteristics of a hologram optical layer.

FIG. 15 is a diagram showing a conventional projection display device.

FIG. 16 is a diagram showing a conventional rear projection display device.

FIG. 17 is a diagram showing a conventional rear projection display device.

[Description of Signs] 10 ... rear projection type display device, 12 ... body, 14
... Screen, 16 ... Optical unit, 20 ...
Non-specular reflection type optical element, 60, 61, 62: transparent substrate, 70: hologram optical layer for R (red), 71
... Hologram optical layer for G (green), 72.
Holographic optical layer for (blue)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 5/74 H04N 5/74 A 9/31 9/31 C (72) Inventor Hiroyuki Ono 6 Kita Shinagawa, Shinagawa-ku, Tokyo 7-35 Chome within Sony Corporation (72) Inventor Hiroshi Takatsuka 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo F-term within Sony Corporation (reference) 2H049 CA01 CA05 CA08 CA09 CA22 CA28 2H088 EA14 EA15 HA13 HA24 HA25 MA20 2H091 FA01Z FA05X FA05Z FA19X FA21X FA26X FA26Z FA29Z FD01 FD06 MA07 5C058 BA35 EA01 EA11 EA32 5C060 BA04 BC01 EA01 GA02 HC00 HC01 HC10 HC14 HC21 HD02 JB06

Claims (4)

[Claims] 1. A non-specular reflection comprising a screen, an optical unit for generating light of an image source, and a hologram optical layer for red, a hologram optical layer for green and a hologram optical layer for blue. Type optical element, disposed in the optical path of the optical unit and the screen, incident light generated by the optical unit, reflecting the light at a reflection angle different from the incident angle of the light, A non-specular reflection type optical element for projecting the light from the back side of the screen to display an image on the screen. 2. The hologram optical layer for red, the hologram optical layer for green, and the hologram optical layer for blue of the non-specular reflection optical element are laminated with a transparent substrate interposed therebetween. The rear projection type image display device as described in the above. 3. The hologram optical layer for red, the green hologram optical layer, and the hologram optical layer for blue of the non-specular reflection optical element are phase hologram optical layers according to claim 2. Rear projection type image display device. 4. The hologram optical layer for red, the hologram optical layer for green, and the hologram optical layer for blue of the non-specular reflection type optical element are formed on a transparent film. 3. The rear projection type image display device according to claim 2, wherein a transparent substrate is bonded.