JP2002156519A - Method for manufacturing hologram color filter and hologram color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an RB(red, blue) two-layered hologram color filter with a single time exposure. SOLUTION: A hologram master 32RB for RB having a surface hologram 34R for R and a surface hologram 34B for B formed on a first transparent substrate 33 in mutually different layers and an RB two-layered hologram material substrate 22KRB2 having a hologram photosensitive material layer 22KR for R and a hologram photosensitive material layer 22KB for B formed on a second transparent substrate 21 are tightly stuck to each other. An R color recording light ray and a B color recording light ray are simultaneously made incident on the hologram master for RB with an identical incident angle and with an interval so as to form a hologram lens layer for R by exposing the hologram photosensitive material layer for R with diffracted rays resulting from diffraction of the R color recoding light ray on the surface hologram for R and to form a hologram lens layer for B by exposing the hologram photosensitive material layer for B with diffracted rays resulting from diffraction of the B color recording light ray on the surface hologram for B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram master for RB in which two kinds of recording lights are simultaneously incident,
A method of manufacturing a hologram color filter for forming an R and B hologram lens layer by exposing an R and B hologram photosensitive material layer with each of diffracted lights diffracted by the R and B surface holograms formed on the B hologram master. And a hologram color filter.

[0002]

2. Description of the Related Art With the advent of the age of digital multimedia, the digitization of television broadcasting has been accelerated.
With the commencement of CS digital broadcasting, which has already been broadcast, and BS digital broadcasting, which has recently been put into practical use, a projection type color liquid crystal device capable of projecting a large-screen image with high definition has attracted attention. I have. The applicant of the present invention discloses a projection type color liquid crystal device in which a hologram lens array is applied as a hologram color filter.
No. 0-19319.

FIG. 1 is a schematic configuration diagram showing a color display device to which a hologram color filter is applied. FIG. 2 is a schematic diagram for explaining the hologram color filter shown in FIG. 3B shows a hologram color filter having a three-layer structure, FIG. 3B shows a hologram color filter having a two-layer structure composed of RB colors, and FIG. 3 shows a hologram color filter having a two-layer structure shown in FIG. FIG. 6 is a diagram illustrating the wavelength dependence of diffraction efficiency for each incident angle of incident light in each hologram lens layer of RB color when used.

The color display device and the hologram color filter shown in FIGS.
The technical idea underlying the hologram color filter according to the present invention will be described with reference to the publication.

As shown in FIG. 1, in a color display device 1 to which a hologram color filter is applied, a liquid crystal panel 10 is provided.
Are a thin glass layer 11, a transparent electrode 12 formed on the back surface of the thin glass layer 11, and a liquid crystal layer 13 serving as a light modulation layer.
And the pixel electrodes 14 # 14r, 14 which are provided corresponding to the RGB (red, green, blue) colors and are also light reflecting surfaces.
g, 14b... FIG. 2B and an active matrix drive circuit 15 for selectively controlling and driving the pixel electrode 14
And the pixel electrode 14 and the active matrix driving circuit 1
And a silicon substrate 16 on which the substrate 5 is mounted. At this time, the liquid crystal layer 13 is held between the thin glass layer 11 and the silicon substrate 16. Note that the illustration of the alignment film, the dielectric film, and the like is omitted in FIG.

The thin glass layer 11 of the liquid crystal panel 10
Above is a hologram color filter 20RGB or 20R
B is adhered. At this time, the hologram color filter 20RGB forms a hologram lens array having a three-layer structure on the back surface of the glass substrate 21 serving as a transparent substrate, and diffracts and separates white light into three colors of RGB (red, green, and blue). The R, G, and B lights are applied to the pixel electrodes 14 (14r, 14g, 1).
An RGB filter 22RGB for condensing light is formed in 4b). On the other hand, the hologram color filter 20RB
Is formed by forming a hologram lens array having a two-layer structure on the back surface of the glass substrate 21, diffracting and separating white light into two colors of RB (red and blue), and separating the separated R and B lights into the pixel electrodes 14 (14).
r, 14g, 14b)
B is formed.

The hologram color filter 20R
The RGB filter 22RGB or the RB filter 22RB of the GB or 20RB is closely attached to the thin glass layer 11 of the liquid crystal panel 10.

A light source 2 such as a metal halide lamp
The emitted white light passes through an optical system (not shown),
The light enters the hologram color filter 20RGB or 20RB at a predetermined incident angle. Thereafter, the light incident on the liquid crystal layer 13 via the hologram color filter 20RGB or 20RB is modulated as needed there, reaches the surface of the pixel electrode 14, and is reflected by the pixel electrode 14. . The reflected light is emitted from the spatial light modulator through a path opposite to the incident direction, is enlarged by the projection lens 3, and reaches the screen (projection surface).

Here, the hologram color filter 20RGB or 20RB described above uses the diffraction spectral function of the hologram lens to convert the RGB of the incident white light.
(Red, green, blue) and diffracts any one of the color lights, and focuses the diffracted light on a predetermined area corresponding to each color light.
Other light can be transmitted straight through as it is, and since there is almost no loss of light due to absorption like a normal color filter using dyes and pigments,
In principle, high light use efficiency can be obtained. Therefore, its use is extremely effective for a projection type liquid crystal display device in which improvement in light use efficiency is required.

The hologram color filter 20R described above
When the GB is formed in a three-layer structure, as shown in FIG. 2A, the RGB filter (three-color filter) 22RGB
The hologram lens layer 22R, G hologram lens layer 22G, and B hologram lens layer 22B respectively correspond to the three primary colors of RGB. The hologram lens layers 22R, 22G, and 22B each have an array of hologram lenses. It is arranged in a shape.

The hologram lens layer for R 22R,
The G hologram lens layer 22G and the B hologram lens layer 22B are arranged so that the centers of the pixel electrodes 14r, 14g, and 14b of the corresponding colors are located at positions vertically lowered from the centers of the respective lens units. At this time, the width of the hologram lens unit of one set of three colors is three pixel electrodes 14 of RGB.
r, 14g, and 14b correspond to the combined width.

The white light incident on the hologram color filter 20RGB from above at a certain angle is selectively diffracted and separated into the corresponding color light in each layer. For example, ideally, in the upper R hologram lens layer 22R, R
The light component is selectively diffracted and dispersed, and the other color light passes straight through as it is to form the middle G hologram lens layer 22G.
Incident on. In the middle G hologram lens layer 22G, the G light component of the light that has passed straight through the upper R hologram lens layer 22R is diffracted and separated, and in the lower B hologram lens layer 22B, the remaining B incident light is B light. The light component is diffracted and split. The RGB color lights diffracted and divided by the respective layers are applied to the pixel electrodes 14r, 14g, 14b of the corresponding colors.
It is almost condensed on top.

On the other hand, when the hologram color filter 20RB is formed in a two-layer structure, as shown in FIG. 2B, the RB filter (two-color filter) 22RB
The hologram lens layer 22R and the hologram lens layer 22B for B correspond to the two primary colors of RB, respectively. The hologram lens layers 22R and 22B have hologram lenses arranged in an array. That is,
Here, the hologram lens layer for G is not required.

The hologram lens layer for R 22R,
The hologram lens layer 22B for B is disposed at a position vertically descended from the center of each lens unit, at a position corresponding to the pixel electrode 14r, 1 of the corresponding color.
The pixel electrode 14g is disposed so that the center of the pixel electrode 4b is located, and the pixel electrode 14g is disposed between the pixel electrodes 14r and 14b.
At this time, the width of one hologram lens unit of two colors is RGB.
It corresponds to the total width of the three pixel electrodes 14r, 14g, 14b.

As described above, by using two layers instead of the conventional three-layer hologram lens layer, it is possible to greatly simplify the process. In particular, the load on the process is reduced because the alignment work of each hologram lens layer to be laminated can be practically halved.

Further, the elimination of the G hologram lens layer is a problem that occurs when the G hologram lens layer is used as an intermediate layer. Since both re-diffraction of incident diffracted light can be prevented, reproducibility of R light and B light is further improved.

At this time, even if the hologram lens layer for G is eliminated, the required diffracted light of G light can be obtained by adjusting the distance between each hologram lens layer 22R, 22B and the pixel electrode 14 to a predetermined distance. It is possible. The reason for this is shown in FIG.
This will be described with reference to (a) to (d).

For example, as shown in FIG. 3A, when white light is incident on the R hologram lens layer 22R at a design incident angle of 60 degrees, red light mainly having a wavelength of 640 nm is mainly diffracted, Other light passes straight through. But,
As shown in FIG. 3B, with respect to the same R hologram lens layer 22R, it is shifted by −5 degrees from the designed incident angle (incident angle 5 °).
5 degrees) In incident white light, G light centered on a wavelength of 540 nm is mainly diffracted.

Similarly, as shown in FIG. 3C, when white light is incident on the hologram lens layer 22B for B at a design incident angle of 60 degrees, blue light having a wavelength of 460 nm is mainly diffracted. , Other light is transmitted straight through. But,
As shown in FIG. 3D, the hologram lens layer 22B for B is shifted by +5 degrees from the designed incident angle (the incident angle is 6 °).
5 degrees) In incident white light, G light centered on a wavelength of 540 nm is mainly diffracted.

That is, although there is no hologram lens layer dedicated to G light for diffracting G light, the hologram lens layers 22R and 22B for R and B are incident at incident angles of 55 ° and 65 ° deviated from the designed incident angles. Some white light
The required diffracted light of G light can be obtained. Further, if the distance between the hologram color filter 20RB and the pixel electrode 14 is adjusted so that the B light diffracted by the R hologram lens layer 22R can be condensed on the pixel electrode of the corresponding color, the necessary G light is Light can be collected on the pixel.

Next, a conventional manufacturing method for manufacturing a hologram color filter will be described with reference to FIGS.

FIG. 4 is a schematic diagram for explaining a general method of manufacturing a hologram color filter, and FIG. 5 is a diagram showing FIG.
FIG. 8 is a schematic diagram for explaining a conventional method for manufacturing the RB two-layer hologram color filter shown in FIG.

First, as shown in FIG. 4, in a general method of manufacturing a hologram color filter, a trapezoidal prism 31 is used.
Hologram master 32 and hologram material substrate 20
K and an index matching liquid (not shown) are prepared.

Here, the trapezoidal prism 31 is for causing the recording light to enter the hologram master 32 at a predetermined angle.

The hologram master 32 described above
A chrome thin film is coated on a transparent glass substrate 33, and a chrome thin film diffraction grating pattern, for example, in the form of a stripe is coated on a predetermined area of the glass
4 was formed.

The hologram material substrate 20K is a material substrate in a state before the hologram color filter is manufactured. The hologram material layer 22K is formed on a transparent glass substrate 21 by coating or pasting. is there.

The above-described index matching liquid is a liquid interposed between two optical objects and is used to adjust the refractive index between the two optical objects.

Then, the glass substrate 33 of the hologram master 32 is brought into close contact with the lower part of the trapezoidal prism 31 with an index matching liquid therebetween, and the hologram master 3
The hologram photosensitive material layer 22K of the hologram material substrate 20K is adhered to the lower side of the surface hologram 34 with an index matching liquid therebetween. In this state, the recording light is made incident on the trapezoidal prism 31, and the recording light is diffracted by the surface hologram 34 of the hologram master 32, and the hologram photosensitive material layer 2 of the hologram material substrate 20 K is diffracted.
2K is exposed to form a hologram lens layer.

More specifically, a case of manufacturing an RB two-layer hologram color filter having a simple hologram lens layer structure as shown in FIGS. 5A and 5B will be described. In FIGS. 5A and 5B, the hologram master and the hologram material substrate are shown separated for convenience of explanation, but in the actual manufacturing process, the hologram color filter is manufactured in the state described in FIG. Is performed.

First, as shown in FIG. 5A, as a first manufacturing step for manufacturing an RB two-layer hologram color filter, a B hologram master 32B is mounted on a transparent glass substrate 33 by a B surface hologram 34B. Are formed in advance.

On the other hand, a hologram material substrate for B (20 KB)
(Not shown)), a hologram photosensitive material layer for B (22 KB) and a PVA film (polyvinyl alcohol film) 23 serving as a protective film are previously formed on a glass substrate 21.
At this time, the B hologram photosensitive material layer (22 KB) uses a B photopolymer photosensitive material having sensitivity to B color.

Here, the B-color recording light is made incident on the trapezoidal prism 31, and the B-color recording light is diffracted by the surface hologram 34B of the hologram master 32 at a predetermined diffraction angle with the first-order diffracted light as it passes through the 0th time. Origami, this 2
The interference light of the light beam is the hologram photosensitive material layer for B (22KB)
Is subjected to interference exposure. Thereafter, if the hologram photosensitive material layer for B (22 KB) is heat-treated, the polymerization of the photopolymer photosensitive material for B proceeds in the exposed portion and the unexposed portion, and the high refractive index layer and the low refractive index layer are formed on the glass substrate 21. Are formed alternately to form a B-color hologram lens layer 22B.

Next, as shown in FIG. 5 (b), as a second manufacturing step for manufacturing an RB two-layer hologram color filter, an R hologram master 32R is mounted on a transparent glass substrate 33 by an R surface hologram. 34R are formed in advance. At this time, the R surface hologram 34R formed on the R hologram master 32R is replaced with the R surface hologram 34R formed on the B hologram master 32B described above.
The center position of the surface hologram is shifted with respect to B. This is because the center of the R surface hologram 34R and the center of the B surface hologram 34B are aligned with the pixel electrodes 14r and 14b {FIG.
(B) This is to correspond to｝.

On the other hand, a hologram material substrate for RB (20K
RB... Are not shown), the B color hologram lens layer 22B and the PVA film 2 are formed on the glass substrate 21 in the above-described first manufacturing process.
3 is formed, and the PVA film 23 which has been formed is used.
Further, a hologram photosensitive material layer for R (22 KR) and PV
A film 23 is formed. At this time, for the R hologram photosensitive material layer (22KR), an R photopolymer photosensitive material having sensitivity to R color is used.

Here, the R-color recording light is made incident on the trapezoidal prism 31, and the R-color recording light is applied to the R hologram master 32.
The first-order diffracted light diffracted at a predetermined diffraction angle by the R surface hologram 34R and the 0th-order diffracted light that passes straight through as it is,
The interference light of the two light beams is applied to the hologram photosensitive material layer for R (22).
KR) by interference exposure. Thereafter, if the R hologram photosensitive material layer (22KR) is heat-treated, the polymerization of the R photopolymer photosensitive material proceeds in the exposed portion and the unexposed portion, and the lower B color hologram lens layer formed on the glass substrate 21 is formed. An R-color hologram lens layer 22R in which high-refractive-index layers and low-refractive-index layers are alternately formed on 22B is formed, and an RB two-layer hologram color filter 20RB is completed.

[0036]

By the way, the above R
The B2 layer type hologram color filter 20RB has RGB
Since the structure is simpler than that of the three-layer hologram color filter 20RGB {FIGS. 1 and 2 (a)}, the manufacturing method associated therewith is easier than the three-layer hologram color filter. When manufacturing the filter 20RB, a first manufacturing process of forming the lower B-color hologram lens layer 22B on the glass substrate 21, and forming the upper R-color hologram lens layer 22R on the lower B-color hologram lens layer 22B In order to pass through the two steps including the second manufacturing step, two types of hologram masters 32R for R and 32R for R must be prepared, and the number of manufacturing steps is increased, leaving room for improvement. I have.

When the RB two-layer hologram color filter 20RB is manufactured, in the first manufacturing process, between the trapezoidal prism 31 and the B master hologram 32B and between the B master hologram 32B and the B hologram material substrate (2
0KB ... FIG. 4), and a step of sandwiching the index matching liquid to bring the members into close contact with each other, and also in the second manufacturing process, the trapezoidal prism 31 and the R master hologram 3
Since there is a step of sandwiching the index matching liquid between the 2R and the master hologram 32R for R and the hologram material substrate for RB (20KRB ... not shown) to bring the members into close contact with each other, the step of sandwiching the index matching liquid is performed. There is considerable danger of foreign matter getting inside the trapezoidal prism 31, the master hologram 32B for B, the master hologram 32R for R, and the hologram material substrate 20K for B.
The index matching liquid contact surface of the hologram material substrate 20KRB for B and RB may be damaged by foreign matter, etc.
The yield is reduced during the mass production of the RB two-layer hologram color filter 20RB, and there are problems such as affecting the performance and quality of the RB two-layer hologram color filter 20RB.

Therefore, when manufacturing the RB two-layer hologram color filter 20RB having a simple structure of the hologram lens layers for R and B, a hologram color filter which can complete all of the exposure, heat treatment and development in one manufacturing process. And a hologram color filter to which the manufacturing method is applied is desired.

[0039]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first invention is a hologram color filter having a hologram lens layer corresponding to two colors of R and B colors. The hologram master for RB, in which the surface hologram for R and the surface hologram for B are formed in different layers on the first transparent substrate, the hologram photosensitive material layer for R and the hologram for B on the second transparent substrate A RB two-layer hologram material substrate in which a photosensitive material layer and a layer corresponding to the surface hologram for R and the surface hologram for B are formed in close contact with each other such that both layers face inward; The R color recording light and the B color recording light are simultaneously incident on the master at the same angle of incidence with an interval, and the R color recording light is diffracted by the R surface hologram. Exposing the R hologram photosensitive material layer to form an R hologram lens layer, and exposing the B hologram photosensitive material layer with diffracted light obtained by diffracting the B color recording light by the B surface hologram. Forming a hologram lens layer for B using a hologram color filter.

According to a second aspect of the present invention, there is provided a method of manufacturing a hologram color filter in which a hologram lens layer corresponding to two colors of R and B is formed. A hologram master for RB, in which the surface hologram is formed in a different layer, and a RB single-layer hologram material substrate, in which a hologram photosensitive material layer for RB is formed on a second transparent substrate, with each layer facing inward. And the R color recording light and the B color recording light are simultaneously incident on the RB hologram master at the same angle of incidence and at an interval, and the diffracted light obtained by diffracting the R color recording light by the R surface hologram. The RB hologram photosensitive material layer is exposed to the hologram photosensitive material layer for R and the diffracted light obtained by diffracting the B color recording light by the surface hologram for B, and the hologram lens layer for R and the hologram layer for B are exposed. A method for producing a hologram color filter, which comprises forming a's layer.

According to a third aspect of the present invention, there is provided a method of manufacturing a hologram color filter in which hologram lens layers corresponding to two colors of R and B are formed. A hologram master for RB, in which the surface hologram is formed in a different layer, and a RB single-layer hologram material substrate, in which a hologram photosensitive material layer for RB is formed on a second transparent substrate, with each layer facing inward. S-polarized light and PS-polarized light of a single wavelength were simultaneously incident on the RB hologram master at different incident angles with different intervals, and the S-polarized light was diffracted by the R surface hologram. The RB hologram photosensitive material layer is exposed with the diffracted light and the diffracted light obtained by diffracting the P-polarized light by the B surface hologram, and the R hologram lens layer and the B hologram lens layer are exposed. A method for producing a hologram color filter, which comprises forming a hologram lens layer.

Further, the fourth invention is a single layer RB obtained by mixing a hologram photosensitive material for R having sensitivity to R color and a hologram photosensitive material for B having sensitivity to B color.
Hologram photosensitive material layer is exposed with two types of recording light,
A hologram color filter, wherein an R hologram lens layer and a B hologram lens layer are formed in an array in the same layer.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method of manufacturing a hologram color filter and an embodiment of a hologram color filter according to the present invention will be described with reference to FIGS. Will be described in order.

<First Embodiment> FIG. 6 is a cross-sectional view illustrating a method of manufacturing a hologram color filter and a hologram color filter according to a first embodiment of the present invention. FIG. 2 is a schematic diagram for explaining a method of manufacturing a hologram color filter and a hologram color filter according to a first embodiment of the present invention.

For convenience of explanation, the same reference numerals are given to the same constituent members as those shown in the conventional example, and the description will be appropriately given, and new reference numerals will be given to the constituent members different from the conventional example. In addition, this embodiment will be described focusing on points different from the conventional example.

Before explaining the method of manufacturing the hologram color filter and the hologram color filter of the first embodiment according to the present invention, FIG. 6 shows an RB two-layer hologram material substrate serving as a material substrate of the hologram color filter of the first embodiment. This will be described with reference to FIG.

In FIG. 6, an RB two-layer hologram material substrate 22KRB2 is a hologram photosensitive material layer 22KB for B on a transparent glass substrate (second transparent substrate) 21 and a transparent first PVA film (polyvinyl alcohol film). ) 23
And the hologram photosensitive material layer for R 22KR and the transparent second
Are formed in this order, and the lower layer B is formed at a stage before the RB two-layer hologram color filter is manufactured.
The hologram photosensitive material layer for use 22KB and the upper layer hologram photosensitive material layer for R 22KR are formed by coating or pasting.

At this time, the hologram photosensitive material layer for B 22K
B has sensitivity to B color (wavelength: about 450 nm)
On the other hand, the R hologram photosensitive material layer 22KR uses an R photopolymer photosensitive material having sensitivity to the R color (wavelength: about 650 nm). Also, the first PVA film 23 and the second PVA film 2
Numeral 3 is formed as a protective film for protecting the hologram photosensitive material layer 22KB for B and the hologram photosensitive material layer 22KR for R.

Next, a method for manufacturing a hologram color filter and a hologram color filter according to a first embodiment of the present invention will be described with reference to FIG.

First, as shown in FIG. 7, as a step of manufacturing the RB two-layer hologram color filter 20RB2, the RB hologram master 32RB is provided under a transparent glass substrate (first transparent substrate) 33 as a B surface hologram. 34B are formed in advance, and an R surface hologram 34R is formed in an upper layer in advance. At this time, both the surface hologram 34B for B and the surface hologram 34R for R are obtained by coating a chromium thin film on a glass substrate 33 and forming, for example, a striped chromium thin film diffraction grating pattern in a predetermined region on the glass substrate 33. And
The center position of the array of the surface hologram 34B for B and the center position of the array of the surface hologram 34R for R are displaced, and the center positions of both arrays are the same as the center positions of the pixel electrodes 14r and 14b as described with reference to FIG. It is formed to correspond substantially.

The RB hologram master 3 is sandwiched by an index matching liquid below the trapezoidal prism 31.
The 2RB glass substrate 33 is brought into close contact with the R hologram master layer 32R of the RB hologram master 32RB, and the index matching liquid is sandwiched below the R matching hologram material substrate 22KRB2 (FIG. 6) on the R hologram photosensitive material layer 22KR side. (Actually, the second PVA film 23 on the front surface side) is adhered. In this state, RB
The surface hologram layers for R and B of the hologram master 32RB for RB and the hologram photosensitive material layers for R and B of the RB two-layer hologram material substrate 22KRB2 (FIG. 6) are in close contact with each other so as to face each other and face inward. , Both 32R
The vertical relationship of each layer for R and B is symmetric about the part where B and 22KRB2 are in close contact.

From the above state, the R color recording light (laser light having a wavelength of approximately 650 nm) and the B color recording light (laser light having a wavelength of approximately 450 nm) are simultaneously applied to the trapezoidal prism 31 in parallel at the same incident angle θ. It is incident. At this time, R
The optical axis of the color recording light is incident so as to be directed toward the center of the array of R surface holograms 34R formed on the RB hologram master 32RB, and the optical axis of the B color recording light is the B surface hologram formed on the RB hologram master 32RB. The light is incident toward the center of the 34B array. After this, R
The upper R hologram photosensitive material layer (22 KR) is subjected to interference exposure on the glass substrate 21 by the diffracted light of the color recording light diffracted by the R surface hologram 34R, and the B color recording light is diffracted by the B surface hologram 34B. The lower layer hologram photosensitive material layer (22) is formed on the glass substrate 21 by the diffracted light.
KB), and then the hologram photosensitive material layer for R (22KR) and the hologram photosensitive material layer for B (22
By performing predetermined fixing (UV irradiation 3J) and heat development processing (120 ° C. 2H) on KB), the glass substrate 21
The hologram lens layer 22R for R is formed on the upper layer and the hologram lens layer 22B for B is formed on the lower layer at the same time, thereby forming an RB two-layer hologram color filter 20RB2.

Therefore, in the first embodiment, the R color recording light and the B
RB double-layer hologram material substrate 22K using color recording light
The two-layer two-layer hologram color filter 20RB2 in which the R and B hologram lens layers 22R and 22B are formed in the upper and lower two layers by one simultaneous exposure to the RB2 can be manufactured, so that the manufacturing time can be reduced. At the same time, the number of steps of sandwiching the index matching liquid is halved as compared with the conventional manufacturing method, so that the entrapment of foreign matters is reduced, and the RB two-layer hologram color filter 2 is used.
The mass productivity of 0RB2 is improved, and the quality and reliability are also improved.

In the first embodiment, when manufacturing the RB two-layer hologram color filter 20RB2, the hologram lens layer 22B for B is formed on the glass
Although the hologram lens layer 22R for R is formed on the upper layer, the hologram lens layer 22R for R and the hologram lens layer 22B for B
May be formed in the upper layer, and in this case also, it can be manufactured by the same manufacturing method as in the first embodiment.

<Second Embodiment> FIG. 8 is a cross-sectional view for explaining an RB single-layer hologram substrate material in a hologram color filter manufacturing method and a hologram color filter according to a second embodiment of the present invention. FIG. 1 is a schematic diagram for explaining a method of manufacturing a hologram color filter and a hologram color filter according to a second embodiment of the present invention.
0 is a schematic diagram for explaining a method of manufacturing the hologram color filter of the second embodiment of the present invention and a modified example in which the hologram color filter is partially modified, and FIG. 11 is a hologram color of the second embodiment of the present invention. FIG. 4 is a diagram illustrating diffraction efficiencies of R light and B light with respect to an incident angle of G light to a filter.

Before explaining the method of manufacturing the hologram color filter and the hologram color filter of the second embodiment according to the present invention, FIG. 8 shows an RB single-layer hologram material substrate serving as the material substrate of the hologram color filter of the second embodiment. This will be described with reference to FIG.

In FIG. 8, the RB1 layer type hologram material substrate 22KRB1 is a hologram photosensitive material layer 22KRB for RB on a transparent glass substrate (second transparent substrate) 21.
And a transparent PVA film (polyvinyl alcohol film) 23
Are formed in order, and the hologram photosensitive material layer 22KRB for RB is formed by coating or pasting before the RB single-layer hologram color filter is manufactured.

At this time, the hologram photosensitive material layer for RB 22
KRB is a photopolymer photosensitive material for R having sensitivity to R color (wavelength of about 650 nm), and a B color (wavelength of about 450 nm).
nm), a mixture of a photopolymer photosensitive material for B having sensitivity to B is used, and the hologram photosensitive material layer 22KRB for RB is a single layer corresponding to R and B. Further, the PVA film 23 is formed as a protective film for protecting the RB hologram photosensitive material layer 22KRB.

Next, a method of manufacturing a hologram color filter and a hologram color filter according to a second embodiment of the present invention will be described with reference to FIG.

First, as shown in FIG. 9, in the step of manufacturing the RB single-layer hologram color filter 20RB1, the same RB hologram master 32RB as that applied to the first embodiment is used. A surface hologram B for B is formed in advance on a lower layer of the glass substrate (first transparent substrate) 33, and a surface hologram R for R is formed in an upper layer in advance.

The RB hologram master 3 is sandwiched by an index matching liquid below the trapezoidal prism 31.
The 2RB glass substrate 33 is adhered to the RB hologram master 32RB, and the index matching liquid is sandwiched below the R surface hologram 34R of the RB hologram master 32RB. (Actually, P on the front side
The VA film 23) is adhered. In this state, the R and B surface hologram layers of the RB hologram master 32RB and the RB hologram photosensitive material layer 22KRB of the RB single-layer hologram material substrate 22KRB1 (FIG. 8) are opposed to each other so as to face inward. Therefore, the vertical relationship is symmetrical with respect to the portion where the two 32RB and 22KRB1 are in close contact.

From the above state, R-color recording light (laser light having a wavelength of approximately 650 nm) and B-color recording light (laser light having a wavelength of approximately 450 nm) are simultaneously applied to the trapezoidal prism 31 in parallel at the same incident angle θ. It is incident. At this time, R
The optical axis of the color recording light is incident so as to be directed toward the center of the array of R surface holograms 34R formed on the RB hologram master 32RB, and the optical axis of the B color recording light is the B surface hologram formed on the RB hologram master 32RB. The light is incident toward the center of the 34B array. After this, R
The hologram photosensitive material layer for RB (22KRB) on the glass substrate 21 is formed by the diffracted light in which the color recording light is diffracted by the R surface hologram 34R and the diffracted light in which the B color recording light is diffracted by the B surface hologram 34B. Adjacent to each other for interference exposure, and only a small part between them (open area)
Are repeatedly subjected to interference exposure. After that, the hologram photosensitive material layer for RB (22 KRB) is subjected to a predetermined fixing (UV irradiation 3J) and a heat development treatment (120 ° C. 2H), so that the glass substrate 21 The hologram lens layer 22R for R and the hologram lens layer 22B for B are adjacently formed in the same layer and are simultaneously formed in an array to complete the RB1 layer type hologram color filter 20RB1.

Therefore, in the second embodiment, the R color recording light and the B
RB single-layer hologram material substrate 22K using color recording light
The RB1 hologram color filter 20RB1 in which the hologram lens layer for R and the hologram lens layer for B are adjacent to each other in the same layer and formed simultaneously in an array can be manufactured by one simultaneous exposure to RB1. In addition, the manufacturing time can be shortened, and the number of steps of sandwiching the index matching liquid is halved as compared with the conventional manufacturing method, so that entrapment of foreign substances is reduced, and the mass productivity of the RB1 layer type hologram color filter 20RB1 is improved. And the quality and reliability are improved. Furthermore, RB
While maintaining the performance of the single-layer hologram color filter 20RB1, the RB single-layer hologram material substrate 22KR
Since it is sufficient to form B1, it is easier to form the hologram material substrate than in the first embodiment. Of course, the RB single-layer hologram color filter 20RB1 manufactured by the manufacturing method of the second embodiment is different from the RB hologram lens layer 22RB.
Since the R hologram lens layer 22R and the B hologram lens layer 22B are adjacent to each other and have a single-layer structure formed simultaneously in an array, they can be provided at low cost.

Next, a method of manufacturing a hologram color filter according to a second embodiment of the present invention and a modification in which the hologram color filter is partially modified will be briefly described with reference to FIG.

As shown in FIG. 10, in the method of manufacturing a hologram color filter according to the second embodiment of the present invention and a modification in which the hologram color filter is partially modified, for example, a laser beam having a single wavelength of 488 nm is converted to S-polarized light. The light and the P-polarized light are extracted, and 488 nm S
The difference from the second embodiment described above is that polarized light and 488 nm P-polarized light are simultaneously incident at different angles of incidence θ1 and θ2 with an interval therebetween.

Here, the diffracted light in which the 488 nm S polarized light is diffracted by the R surface hologram 34R and the diffracted light in which the 488 nm P polarized light is diffracted by the B surface hologram 34B are used to form the RB hologram photosensitive material layer on the glass substrate 21. (22KRB) adjacent to each other and subjected to interference exposure,
At the same time, a very small portion (open area) between the two is subjected to interference exposure, and thereafter, a predetermined fixing (UV irradiation 3J) and a heat development processing (120) are performed on the RB hologram photosensitive material layer (22KRB). C2H), the R hologram lens layer 22R and the B hologram lens layer 22B are adjacently formed in the same layer on the glass substrate 21 and are simultaneously formed in an array. 20RB1 is completed. Therefore, the same effect as the second embodiment can be obtained in the modification of the second embodiment.

Next, the diffraction efficiencies of the R light and the B light are measured for the RB1 layer type hologram color filter 20RB1 according to the second embodiment and a modified example of the second embodiment. The results are shown in FIG.

Here, the method of measuring the diffraction efficiency of the R light and the B light with respect to the RB1 layer type hologram color filter 20RB1 is as follows. The measurement G light (laser beam having a wavelength of 541 nm) is applied to the RB1 layer type hologram color filter 20R.
The diffraction efficiency of R light and B light was measured by changing the angle of incidence (degree) when the light was incident on B1.

At this time, the diffraction efficiency of the R light and the B light is measured by placing the RB single-layer hologram color filter 20RB1 in a beaker filled with an index matching solution, and using a wavelength 541 emitted from a laser source fixed and installed.
By rotating the RB1 layer type hologram color filter 20RB1 with respect to the laser beam of nm, the RB1 layer type hologram color filter 20RB of the laser beam is rotated.
The incident angle (degree) to 1 was changed, the first-order diffracted light at each incident angle was taken in by a detector, and the ratio to the 0-order incidence was defined as the diffraction efficiency.

As shown in FIG. 11, the measurement results of the diffraction efficiency of the R light and the B light with respect to the RB1 layer type hologram color filter 20RB1 show that the peak value of the R diffraction efficiency by the R hologram lens layer 22R is Although slightly lower than the peak value of the B diffraction efficiency by the hologram lens layer 22B, the R diffraction efficiency with respect to the incident angle range for G light is wider than the B diffraction efficiency, so that the peak value and the incident angle range for G light are different. In consideration of the above, it can be considered that the R diffraction efficiency and the B diffraction efficiency are substantially equivalent, and the R hologram lens layer 22R and the B hologram lens layer 22B in the same layer have substantially the same diffraction efficiency performance. It turned out that it was.

As a result, in the RB1 layer type hologram color filter 20RB1 according to the second embodiment and a modified example of the second embodiment, the performance of the RB1 layer type hologram color filter 20RB1 can be maintained as described above. Above, the RBRB single-layer hologram material substrate 22KRB1 in which one RB hologram photosensitive material layer 22KRB is formed on the glass substrate 21 may be prepared.
The production of the hologram material substrate is easier than in the embodiment.

[0072]

According to the method for manufacturing a hologram color filter and the hologram color filter according to the present invention described in detail above, according to the method for manufacturing a hologram color filter according to the first aspect of the present invention, the R color recording light and the B color recording light are used. RB
Up and down by two simultaneous exposures to the two-layer hologram material substrate
RB2 in which R and B hologram lens layers are formed
Since the layer type hologram color filter can be manufactured, the manufacturing time can be shortened, and the number of steps of sandwiching the index matching liquid is also halved as compared with the conventional manufacturing method, so that entrapment of foreign substances is reduced, The mass productivity of the RB two-layer hologram color filter is improved, and the quality and reliability are also improved.

According to the method of manufacturing a hologram color filter according to the second aspect, the R layer recording light and the B color recording light simultaneously expose the RB single-layer hologram material substrate to the RB single layer hologram material substrate once in the same layer. RB in which a hologram lens layer and a hologram lens layer for B are adjacent to each other and are simultaneously formed in an array
Since a single-layer hologram color filter can be manufactured, the manufacturing time can be reduced, and the number of steps of sandwiching the index matching liquid is halved as compared with the conventional manufacturing method, so that foreign matter is less involved. , RB1 layer type hologram color filter is improved in mass productivity, and quality and reliability are also improved. Further, since the performance of the RB single-layer hologram color filter can be maintained, an RB single-layer hologram material substrate in which one RB hologram photosensitive material layer is formed on the second transparent substrate can be formed. Creation becomes easier.

Further, according to the method of manufacturing a hologram color filter according to the third aspect, a single simultaneous exposure of the RB single layer type hologram material substrate with S-polarized light and P-polarized light of a single wavelength within the same layer. Since the hologram lens layer for R and the hologram lens layer for B are adjacent to each other and an RB single-layer hologram color filter formed simultaneously in an array can be manufactured, the same effect as in the above-mentioned claim 2 can be obtained. Can be.

Further, according to the hologram color filter of the fourth aspect, the hologram lens layer for RB has a single layer structure in which the hologram lens layer for R and the hologram lens layer for B are adjacent to each other and are simultaneously formed in an array. Therefore, it can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a color display device to which a hologram color filter is applied.

FIG. 2 is a schematic diagram for explaining the hologram color filter shown in FIG.

FIG. 3 is a diagram showing the wavelength dependence of the diffraction efficiency with respect to each incident angle of incident light in each hologram lens layer of the RB color when the two-layer hologram color filter shown in FIG. 2B is used. It is.

FIG. 4 is a schematic view for explaining a method of manufacturing a general hologram color filter.

FIG. 5 is a schematic diagram for explaining a conventional method for manufacturing the RB two-layer hologram color filter shown in FIG. 2 (b).

FIG. 6 is a cross-sectional view for explaining an RB two-layer hologram substrate material in the hologram color filter manufacturing method and the hologram color filter according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram for explaining a method of manufacturing a hologram color filter and a hologram color filter according to a first embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a method of manufacturing a hologram color filter and a hologram color filter according to a second embodiment of the present invention.

FIG. 9 is a schematic diagram for explaining a hologram color filter manufacturing method and a hologram color filter according to a second embodiment of the present invention.

FIG. 10 is a schematic diagram for explaining a method of manufacturing a hologram color filter according to a second embodiment of the present invention and a modification in which the hologram color filter is partially modified.

FIG. 11 is a diagram showing diffraction efficiencies of R light and B light with respect to the incident angle of G light to the hologram color filter of the second embodiment according to the present invention.

[Explanation of symbols]

 20RB1 ... RB1 layer type hologram color filter, 20RB2 ... RB two layer type hologram color filter, 21 ... second transparent substrate (glass substrate), 22KRB1 ... RB1 layer type hologram material substrate, 22KRB2 ... RB two layer type hologram material substrate, 22KR ... R Hologram photosensitive material layer for 22KB ... hologram photosensitive material layer for B, 22KRB ... hologram photosensitive material layer for RB, 22R ... hologram lens layer for R, 22B ... hologram lens layer for B, 22RB ... hologram lens layer for RB, 31 ... Trapezoidal prism, 32RB Hologram master for RB, 33 ... First transparent substrate (glass substrate), 34R ... Surface hologram for R, 34B ... Surface hologram for B.

Claims (4)

[Claims] 1. A method of manufacturing a hologram color filter in which hologram lens layers corresponding to two colors of R and B are formed, wherein a surface hologram for R and a surface hologram for B are formed on a first transparent substrate. An RB hologram master formed in a different manner, and an RB2 in which an R hologram photosensitive material layer and a B hologram photosensitive material layer are formed on a second transparent substrate in a layer corresponding to the R surface hologram and the B surface hologram.
The layered hologram material substrate is brought into close contact with the respective layers so that the respective layers face inward, and the R-color recording light and the B-color recording light are simultaneously incident on the RB hologram master at the same angle of incidence and separated by an interval. The R color hologram photosensitive material layer is exposed to the R color hologram photosensitive material layer with the diffracted light obtained by diffracting the R color recording light by the R surface hologram to form an R hologram lens layer. A method for manufacturing a hologram color filter, comprising exposing the hologram photosensitive material layer for B with a diffracted light diffracted by a surface hologram to form a hologram lens layer for B. 2. A method for manufacturing a hologram color filter in which hologram lens layers corresponding to two colors of R and B are formed, wherein a surface hologram for R and a surface hologram for B are formed on a first transparent substrate. The RB hologram master formed incorrectly and the RB single-layer hologram material substrate in which the RB hologram photosensitive material layer is formed on the second transparent substrate are brought into close contact with each other so that each layer faces inward, and The R-color recording light and the B-color recording light are incident on the hologram master for R and B at the same angle of incidence at the same time, with the R-color recording light diffracted by the R surface hologram and the B-color recording light. Exposes the RB hologram photosensitive material layer with the diffracted light diffracted by the B surface hologram to form an R hologram lens layer and a B hologram lens layer. Method for producing a hologram color filter according to claim and. 3. A method for manufacturing a hologram color filter in which hologram lens layers corresponding to two colors of R and B are formed, wherein a surface hologram for R and a surface hologram for B are formed on a first transparent substrate. The RB hologram master formed incorrectly and the RB single-layer hologram material substrate in which the RB hologram photosensitive material layer is formed on the second transparent substrate are brought into close contact with each other so that the respective layers face inward. The S-polarized light and the PS-polarized light of a single wavelength are simultaneously incident on the hologram master at different angles of incidence and at different intervals, and the S-polarized light is diffracted by the R surface hologram and the P-polarized light. Exposure of the RB hologram photosensitive material layer with light diffracted by the surface hologram for B causes the hologram lens layer for R and the hologram lens for B to be exposed. Method for producing a hologram color filter, which comprises forming and. 4. One RB hologram photosensitive material layer obtained by mixing a hologram photosensitive material for R having sensitivity to R color and a hologram photosensitive material for B having sensitivity to B color is formed by two kinds of hologram photosensitive materials. 1. A hologram color filter, wherein a hologram lens layer for R and a hologram lens layer for B are formed in an array in the same layer by exposure to recording light.