JP3354202B2 - Color filter using hologram and method for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter using a hologram which can be used for an image input / output device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, color filters have been used in image input / output devices, and pigment or dye type filters are generally used. The color filter is formed by exposing, for example, red (R) light to a photosensitive material through a mask, recording, developing, and applying a pigment or dye to form an R pattern. By sequentially performing such processing, patterns for G and B are formed, and a color filter is created.

[0003]

However, in the conventional color filter, exposure for each of R, G, and B is performed.
Development and application of a pigment or a dye must be performed, and there has been a problem that alignment is difficult and the yield is poor. When used in an image input / output device, the transmittance of each color in the color filter is about 60 to 70%,
Sufficient efficiency could not be obtained.

The present invention has been made in view of such problems of the prior art, and has as its object to use a hologram that can facilitate manufacture, improve yield, and increase efficiency. It is an object to provide a color filter and a manufacturing method thereof.

[0005]

According to the present invention, a reflection hologram for diffracting light of blue and green, blue and red, and green and red wavelengths is formed for each pixel, and wavelengths of red, green and blue as complementary colors are formed. It is characterized by transmitting light. Also, the present invention provides a method in which a reflection type hologram includes two hologram recording light-sensitive materials in one layer.
It is characterized by being formed by double exposure so as to diffract a color. Further, the present invention is characterized in that the reflection hologram is formed by using two layers of the hologram recording light-sensitive material and diffracting one color in each layer. Further, the present invention is characterized in that a trimming color filter is provided on the back surface of the reflection hologram. The present invention also provides red, green,
It is characterized by forming a reflection hologram that diffracts blue and green, blue and red, and green and red wavelength light for each pixel using a laser having an oscillation wavelength of each blue color on a hologram recording photosensitive material. I do. In addition, the present invention uses a laser having an oscillation wavelength of one color to photograph a hologram recording sensible material at different angles, and diffracts blue and green, blue and red, and green and red wavelength light for each pixel. Forming a shaped hologram.

[0006]

According to the present invention, if one original hologram is prepared, a photosensitive material for duplication is combined therewith, and a laser beam is incident through a mask having only desired pixels opened at an angle for reproducing the original. Thus, a large number of holograms having the same performance as the original can be produced. In addition, since the complementary color of the other two colors of diffracted reflected light is used, the light transmittance is high, which is about 60 to 70% in the conventional method, but is 90% or more for each color in the present invention. can do. Therefore, using the color filter of the present invention, a photoconductor having a transparent electrode laminated thereon and a liquid crystal recording medium having a transparent electrode laminated on a polymer-dispersed liquid crystal layer in which liquid crystal is dispersed in a resin are disposed so as to face each other, and voltage is applied. By exposure, a color image can be recorded on the liquid crystal layer.

[0007]

FIG. 1 is a diagram for explaining the basic concept of a color filter using a hologram according to the present invention. As shown in the figure, the color filter is configured such that a reflection hologram is recorded twice for each pixel so that light of two colors is reflected and diffracted, and light of one color is transmitted as a complementary color. That is, the reflection hologram 1 and the reflection hologram 2 are superimposed on one pixel. At this time, an interference pattern is recorded in each hologram so as to diffract green (G) and blue (B), red (R) and blue (B), and red (R) and green (G), respectively. When white light 3 is irradiated, G and B, R and B, R
And G respectively reflect two colors as diffracted light 4 and obtain R, G, and B transmitted light 5 as complementary colors.

FIG. 2 is a view showing a photographing optical system of the color filter of FIG. The mirror 11 and the light-sensitive material layer 10 are brought into close contact with each other, and a mask 12 having an opening for each of R, G, and B pixels is arranged on the light-sensitive material layer. Is vertically incident. The irradiated laser light is mirror 1
Interference fringes are recorded on the exposed portion 14 in parallel with the surface by interfering with the reflected light from. Such exposure is sequentially performed on the mask 12.
Are shifted to perform R and G, G and B, and B and R to record interference fringes. Thus, the reflection hologram for each pixel shown in FIG. 1 is formed.

As shown in FIG. 3A, the portion recorded by the exposure of the laser beams of two colors R and G has a wavelength of 500 nm.
The blue region has the following spectral characteristics having transmittance, and the region irradiated with the G and B laser beams has spectral characteristics with large transmittance in the region of 500 to 600 nm as shown in FIG. The area irradiated with the B and R lasers is shown in FIG.
As shown in FIG. 7, spectral characteristics having a large transmittance in a region of 600 nm or more are obtained.

Next, an experiment for confirming the effect of the present invention will be described.

The conditions for producing the hologram used in this experiment are as follows.

Hologram type: reflection hologram Holographic recording sensitizer: dichromated gelatin (red sensitized by methylene blue injection) Recording laser: blue for argon ion laser, output 5 W, 488 nm, Spectra Physics model 220 # 055 Argon ion laser for green, output 5 W, 414 nm, Model 220 ト ラ 055 made by Spectra Physics Krypton laser for red, output 5 W, 647 nm, Model Inova 200K3 manufactured by Coherent Inc. Recording photochemical system: reflection hologram recording optical system (FIG. 2) Recording conditions: Object light intensity 5.0 mw / cm ² Reference light intensity 5.0 mw / cm ² Total 10.0 mw / cm ² Photographing time: 6.0 sec Exposure amount: 60 mj / cm ² Development processing condition: Rinse with water 10 minutes, IPA + water (3: 7) 1 minute, IPA + water (7: 3) 2 minutes, IPA 5 minutes, drying 15 minutes Hologram size: 1 pixel (100 μm × 300 μm) The hologram obtained by this photographing can be used as it is as a color filter or as an original copy. It can also be used. The exposure for each color was performed by using a mask having an opening of one pixel (100 μm × 300 μm) for only the portion to be exposed. At this time, double recording of one pixel is performed, and there are three combinations of R + G, G + B, and B + R. Therefore, the above-described laser is emitted in such a set, the mask is sequentially shifted by one pixel, and the laser set is also sequentially changed to produce one color filter by a total of three exposures.

When white light was made incident on the hologram manufactured under such conditions, it was confirmed that R, G, and B single colors could be extracted as complementary colors of the three colors of diffracted light of the hologram for each pixel. . In the above description, a double-recorded hologram is used, but two holograms may be stuck together, and one color may be recorded for each pixel.
It is also possible to attach two sheets so that the diffracted light becomes a set of R + G, G + B, B + R for each pixel, and to give the same function. In addition, as described above, the pitch of the interference fringes can be reduced by changing to a method of manufacturing using lasers of three colors of R, G, and B and changing the incident angle of laser light at the time of photographing by using one color of laser. Alternatively, a similar hologram can be produced by recording interference fringes having a pitch corresponding to each of the colors R, G, and B. Further, in order to further restrict the wavelengths of the R, G, and B outgoing lights and improve the wavelength selectivity, a trimming filter may be attached to the back surface of the hologram to completely remove other colors.

Using the hologram configured as described above, the light emitted from the hologram is received by a CCD, converted into an electric signal, and can be used for inputting a color image to another device. It is also possible to combine this hologram with a spatial light modulator and replace it with a conventional color filter and use it for color image output.

[0015]

As described above, according to the present invention, since the complementary colors of the other two colors of diffracted reflected light are used, the light transmittance is high,
It is possible to achieve 90% or more for each color, and it is easy to manufacture. By inputting a laser beam through a mask having only desired pixels opened, a large number of holograms having the same performance as the original are manufactured. It is possible to significantly improve the yield.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of the present invention.

FIG. 2 is a diagram illustrating a photographing optical system of a color filter.

FIG. 3 is a diagram illustrating spectral characteristics of a color filter.

[Explanation of symbols]

1, 2 ... reflection hologram, 3 ... white light, 4 ... diffracted light,
5: transmitted light, 10: photosensitive material layer, 11: mirror, 12: mask, 13: laser beam, 14: exposed part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 5/20-5/28 G02B 5/32 G03H 1/00-5/00

Claims (6)

(57) [Claims] 1. A hologram in which a reflection type hologram for diffracting blue, green, blue and red, and green and red wavelength lights is formed for each pixel, and a red, green and blue wavelength light is transmitted as a complementary color. Color filter using. 2. The hologram according to claim 1, wherein the reflection hologram is formed in one layer of the hologram recording light-sensitive material by double exposure so as to diffract two colors. Color filters. 3. The color filter using a hologram according to claim 1, wherein the reflection type hologram is formed by using two layers of photosensitive material for hologram recording and diffracting one color in each layer. . 4. A color filter using a hologram according to claim 1, wherein a trimming color filter is provided on the back surface of the reflection hologram. 5. A hologram recording photosensitive material using a laser having an oscillation wavelength of each of red, green, and blue, and a reflection that diffracts light of blue and green, blue and red, and green and red for each pixel. A method for producing a color filter using a hologram, characterized by forming a shaped hologram. 6. A hologram recording photographic material which is photographed at different angles by using a laser having an oscillation wavelength of one color, and reflects light of wavelengths of blue and green, blue and red, and green and red for each pixel. A method for producing a color filter using a hologram, characterized by forming a shaped hologram.