JPH08190092A - Liquid crystal projection display device using hologram color filter - Google Patents

Abstract

PURPOSE: To provide a liquid crystal projection display device using a hologram color filter where the utilization efficiency of illuminating light is drastically improved, which is excellent in color reproducibility without irregular color and which can faithfully display a color video. CONSTITUTION: This color liquid crystal display device 11 is constituted of a hologram 5 emitting the light of a different wavelength region in a specified spatial cycle by diffracting and spectrally splitting incident light as a color filter and a liquid crystal display element 6. The device 11 is illuminated by white parallel back light 3 from an illuminator 14 constituted by combining a lamp 15 and a parabolic mirror 16, and a displayed image modulated by the device 11 is enlarged and formed on a screen 19 by a projection lens 18 through a field lens 17 arranged in the vicinity so as to display the bright projected image without the irregular color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projection display device using a holographic color filter, and in particular, it greatly improves the utilization efficiency of illumination light, has good color reproducibility without color unevenness, and faithfully reproduces colors. The present invention relates to a liquid crystal projection display device capable of displaying an image.

[0002]

2. Description of the Related Art Conventionally, in a color liquid crystal display device using an absorption color filter made of pigment, dye, etc.,
A backlight is essential for display.
However, if the white light is directly emitted from the back of the color liquid crystal display device, its utilization efficiency is very low. The main reasons are listed below.

The black matrix other than the cells of each color occupies a large area, and the light impinging on it is wasted. Of the white light incident on each pixel, R (red), G (green),
Since the color components that pass through the B (blue) color filter are limited, other complementary color components are wasted. There is a loss due to absorption in the color filter.

In order to solve such a problem, as shown in FIG. 8, for example, a microlens array 2 is installed in front of the color filter 1, and a white light backlight 3 is provided in each of the color filter cells R, G, B. Conventionally, a method of increasing the utilization efficiency of the backlight 3 by collecting the light is known. In FIG. 8, reference numeral 4 indicates a black matrix provided between the color filter cells R, G and B.

However, even with this method, the white light 3 cannot be spectrally applied to each of the color filter cells R, G, B, and therefore the above-mentioned problem cannot be solved.

Further, Japanese Patent Application Laid-Open No. 4-60538 proposes a liquid crystal projector which improves the light utilization efficiency by using three dichroic mirrors and a microlens array without using such a color filter. In this case, the absorption color filter due to the above-mentioned pigments, dyes, etc. is not necessary, the above-mentioned problems (1) to (3) are solved, and the brightness of the color image is improved, but since three dichroic mirrors are required, the optical The system / device becomes large and bulky. There is also a problem that the cost becomes high.

In view of such a situation, the applicant of the present invention has used a color filter using a hologram in Japanese Patent Application No. 5-12170, etc. in order to significantly improve the utilization efficiency of a backlight for liquid crystal display and the like. The liquid crystal display device was proposed.

Further, a liquid crystal projection display device which changes the liquid crystal display device using such a hologram color filter to a projection type and displays a bright color image on a screen is proposed in Japanese Patent Application No. 5-242292. did.

[0009]

However, when the liquid crystal display device using the hologram color filter as described above is used for a projection device, a part of the light diffracted by the hologram color filter has a corresponding color. It has been discovered that the color image displayed on the liquid crystal display device may not be faithfully reproduced and projected because the color image displayed on the liquid crystal display device may enter the liquid crystal cell adjacent to it, which is not the liquid crystal cell to be displayed. It was

Further, the light diffracted and dispersed by the hologram color filter enters the liquid crystal display device at different angles for each wavelength and exits from the liquid crystal display device at different angles.
It has been found that when this is simply projected by a projection lens, different colors are attached to the left and right peripheral portions on the screen.

Further, the condition of the parallelism of the backlight required for color display with good color reproducibility in the liquid crystal projection display device using such a hologram color filter, and the hologram color for reproducing the image clearly and faithfully. It is also necessary to study the positional relationship between the filter and the polarizing plate of the liquid crystal display device, as well as the structure of a hologram composed of uniform interference fringes with higher backlight utilization efficiency.

The present invention has been made in view of such a situation of the prior art, and an object thereof is to significantly improve the utilization efficiency of illumination light, to obtain good color reproducibility without color unevenness, and faithfully. A liquid crystal projection display device using a hologram color filter capable of displaying a color image.

[0013]

A liquid crystal projection display device using a hologram color filter of the present invention that achieves the above object displays an image displayed on a color liquid crystal display device by enlarging and projecting it on a screen by a projection optical system. In the liquid crystal projection display device, a hologram is used as a color filter of the color liquid crystal display device for diffracting and splitting incident light to emit light of different wavelength bands in a predetermined spatial cycle, and It is characterized in that a field lens is arranged near the emission side.

In this case, the hologram dispersion angle is ± 15 °.
The following is desirable.

The hologram has a spectral function and a light condensing function, or has a spectral function. In the latter case, the color liquid crystal display device is provided with a condensing optical element in combination with the hologram. It is a thing. Furthermore, in this latter case, the hologram having this spectral function can consist of a blazed holographic diffraction grating.

The field lens is preferably a Fresnel lens.

Further, it is desirable to dispose a cut filter having a transmittance of 5% or less in a desired wavelength region in the optical path from the light source to the screen. Specifically, 430 nm
Short wavelength cut filter having a transmittance of 5% or less for the following wavelengths, long wavelength cut filter having a transmittance of 660 nm or more for a wavelength of 5% or less, and a band having a transmittance of 5% or less for a wavelength between 490 nm and 510 nm. It is desirable to dispose either a cut filter or a band cut filter having a transmittance of 5% or less at a wavelength between 570 nm and 590 nm. A hologram reflection filter can be used as the band cut filter.

Further, it is desirable that the hologram is arranged closer to the light source than the incident side polarizing plate of the color liquid crystal display device.

Furthermore, the parallelism of the illumination light of the hologram is
It is desirable that the component within ± 6 ° with respect to the traveling direction is 80% or more.

[0020]

In the present invention, a hologram is used as a color filter of a color liquid crystal display device for diffracting and splitting incident light to emit light of different wavelength regions in a predetermined spatial cycle, and the hologram of the color liquid crystal display device is emitted. Since the field lens is arranged in the vicinity of the side, the utilization efficiency of the illumination light of the projection device is greatly improved, color reproducibility is good without color unevenness, and a faithful color image can be projected and displayed.

[0021]

EXAMPLES A liquid crystal projection display device using the hologram color filter of the present invention will be described below based on examples. First, a first liquid crystal display device used in the present invention will be described with reference to the sectional view of FIG. In the figure, a hologram array 5 constituting the color filter of the first embodiment is arranged at a distance on the side of the liquid crystal display element 6 on which the liquid crystal display element 6 is incident, which is regularly divided into liquid crystal cells 6 '(pixels). On the rear surface of the liquid crystal display element 6, the black matrix 4 provided between the liquid crystal cells 6'is arranged. In addition to the above, polarizing plates (not shown) are arranged on both sides of the liquid crystal display element 6.

The hologram array 5 corresponds to a repeating period of R, G, and B color-separating pixels, that is, a set of three liquid crystal cells 6'adjacent to each other in the direction of the liquid crystal display element 6 in the plane of the drawing. It is composed of minute holograms 5'arranged in an array at the same pitch as the repeating pitch, and the minute holograms 5'are aligned in groups of three liquid crystal cells 6'adjacent to each other in the direction of the paper surface of the liquid crystal display element 6 to form one group. The micro holograms 5'are arranged one by one, and each micro hologram 5'corresponds to the micro hologram 5'the light of the green component in the backlight 3 which is incident at an angle θ with respect to the normal line of the hologram array 5. It is formed in a Fresnel zone plate shape so as to collect light on the liquid crystal cell G at the center of the three color-dividing pixels R, G, and B. The minute hologram 5'is a relief type which has little or no wavelength dependence of diffraction efficiency,
It consists of transmission holograms such as phase type and amplitude type. Here, the fact that the diffraction efficiency has no or little wavelength dependence does not mean that it does not diffract only a specific wavelength and does not diffract other wavelengths like a Lippmann hologram.
It means a single diffraction grating that diffracts any wavelength,
The diffraction grating whose diffraction efficiency has little wavelength dependence diffracts at different diffraction angles depending on the wavelength.

With such a structure, when the white backlight 3 which is incident at an angle θ with respect to the normal line from the surface of the hologram array 5 on the side opposite to the liquid crystal display element 6 is incident, the wavelength is changed. The diffraction angles of the minute holograms 5'are different depending on the wavelengths, and the focusing positions for each wavelength are dispersed in the direction parallel to the surface of the hologram array 5. Among them, the red wavelength component is located at the position of the liquid crystal cell R displaying red, the green component is located at the position of the liquid crystal cell G displaying green, and the blue component is located at the position of the liquid crystal cell B displaying blue. By arranging the hologram array 5 so as to diffract and collect light, each color component passes through each liquid crystal cell 6 ′ with almost no attenuation in the black matrix 4 and the liquid crystal cell 6 ′ at the corresponding position. Color display can be performed according to the state. The angle of incidence θ of the backlight 3 on the hologram array 5 depends on the hologram recording conditions, the hologram array 5
And the distance between the hologram array 5 and the liquid crystal display element 6 and the like.

As described above, by using the hologram array 5 as a color filter, each wavelength component of the conventional color filter backlight can be made incident to each liquid crystal cell 6'without being absorbed, and its utilization efficiency is improved. Can be significantly improved.

Next, the second liquid crystal display device used in the present invention will be described with reference to the same sectional view of FIG. In the figure, a second liquid crystal display device 6 is regularly divided into liquid crystal cells 6 ′ (pixels) and a second liquid crystal display device 6 is provided on the light incident side of the backlight 3.
The color filters 10 in the form of are separated from each other.
On the rear surface of the liquid crystal display element 6, the black matrix 4 provided between the liquid crystal cells 6'is arranged. In addition to the above, polarizing plates (not shown) are arranged on both sides of the liquid crystal display element 6.

The color filter 10 of the second embodiment comprises a hologram 7 and a microlens array 8, and the microlens 8'constituting the microlens array 8 is
The R-, G-, and B-color-separated pixels have a repeating period, that is, each of the sets of three liquid crystal cells 6'adjacent to each other in the direction of the paper surface of the liquid crystal display element 6 has the same pitch as the repeating pattern. It is located in. Also, hologram 7
Is a transmission hologram of relief type, phase type, amplitude type or the like, which is composed of uniform interference fringes acting as a diffraction grating and has little or no wavelength dependence of diffraction efficiency.

Due to this structure, the hologram 7
When the backlight 3 is incident on the surface of the liquid crystal display element 6 opposite to the normal to the liquid crystal display element 6, the light is diffracted at different angles depending on the wavelength and is dispersed on the exit side of the hologram 7. . Due to the microlens 8 ′ arranged on the entrance side or the exit side of the hologram 7, this dispersed light is
The light is separated and condensed for each wavelength on the focal plane. Among them,
The red wavelength component is diffracted and focused on the position of the liquid crystal cell R displaying red, the green component is focused on the position of the liquid crystal cell G displaying green, and the blue component is focused on the position of the liquid crystal cell B displaying blue. By arranging the color filters 10 as described above, the respective color components pass through the respective liquid crystal cells 6 ′ with little attenuation in the black matrix 4 and correspond to the state of the liquid crystal cells 6 ′ at the corresponding positions. Color display can be performed. The angle of incidence θ of the backlight 3 on the hologram 7 depends on the hologram recording conditions, the thickness of the hologram 7,
It is determined by various conditions such as the distance between the hologram 7 and the liquid crystal display element 6.

In such an arrangement, as the hologram 7, it is possible to use a transmissive hologram having uniform interference fringes, which does not have a light-collecting property and has a small wavelength dependence of the diffraction efficiency. 1 is not required to be aligned with each microlens 8 ', and the pitch of the microlens array 8 is three times that of the conventional case shown in FIG.

In the present invention, the liquid crystal display device using the hologram color filter having the structure shown in FIG. 1 or 2 is used as a spatial light modulator for projection display. 3 is a cross-sectional view of a liquid crystal projection display device using the color liquid crystal display device 11 having the structure shown in FIG. 1 as the spatial light modulator according to the present invention.
The same configuration can be applied when the above liquid crystal display device is used. In addition, in this figure, polarizing plates 12 and 13 for a liquid crystal display device, which are arranged close to both sides of the liquid crystal display element 6, are shown. The polarizing plate 12 on the incident side is a hologram array 5 and a liquid crystal. It is arranged between the display element 6 and the display element 6. The color liquid crystal display device 11 is illuminated by a white parallel backlight 3 from a lighting device 14 including, for example, a combination of a metal halide lamp 15 and a parabolic mirror 16, and a display modulated by the color liquid crystal display device 11 is displayed. The image passes through a field lens 17 arranged in the vicinity of the liquid crystal display device 11, is enlarged by a projection lens 18 and is enlarged and focused on a screen 19, so that a bright projected image can be obtained.

Here, the incident side polarizing plate 12 for the liquid crystal display device may theoretically be arranged on the incident side of the hologram array 5, but in reality, the hologram array 5 is made of the material (photo). Since there is birefringence due to (polymer etc.), the illumination light that has passed through the polarizing plate 12 and the hologram array 5 sequentially becomes elliptically polarized light instead of linearly polarized light, and therefore twisted nematic liquid crystal or the like is sandwiched between transparent electrodes. After passing through the liquid crystal display element 6 and the polarizing plate 13, there is a possibility that desired modulation cannot be applied. Therefore, as shown in FIG. 3, the polarizing plate 12 is preferably arranged between the hologram array 5 and the liquid crystal display element 6.

The field lens 17 is arranged near the exit side of the liquid crystal display device 11 for the following reason. That is, the R, G, and B lights that have been separated by the hologram array 5 and have passed through the liquid crystal display element 6 are emitted in the directions shown by the broken lines in FIG. Since the dispersion angle (α in FIG. 1) of the light diffracted and dispersed by the hologram array 5 is about ± 15 ° or less, as is clear from the figure, when the field lens 17 is not arranged, the vicinity of the upper end of the liquid crystal display element 6 is The light of B emitted from the above does not enter the projection lens 18 and does not contribute to the image formation of the display image of the liquid crystal display device 11 on the screen 19. On the other hand, the R light emitted from the vicinity of the lower end of the liquid crystal display element 6 does not enter the projection lens 18 and similarly does not contribute to the formation of the display image of the liquid crystal display device 11. Therefore, screen 1
The projected image near the upper end of 9 is bluish and the screen 19
The projected image near the lower end of the image becomes reddish, and there is a possibility that a faithful color image cannot be reproduced due to color unevenness. On the other hand, as shown in FIG. 3, when the field lens 17 is arranged immediately after the exit side of the liquid crystal display device 11, the R, G, and B lights emitted in the directions shown by the broken lines in FIG. 3 are shown by solid lines. Field lens 17
The B light emitted from the vicinity of the upper end of the liquid crystal display element 6 and the R light emitted from the vicinity of the lower end thereof are all incident on the projection lens 18 and contribute to the formation of a projected image. Therefore, the projected image is bluish near the upper and lower ends of the screen 19,
It does not become reddish, and color unevenness does not occur. Further, by disposing the field lens 17, the amount of light that contributes to the formation of a projected image also increases, so that the utilization efficiency of illumination light is further improved.

The field lens 17 is a cylindrical lens having a positive refracting power at least in the diffraction direction of the hologram array 5, that is, in the plane of the paper of FIG.
Any of a toric lens, an axially symmetric positive lens, and a Fresnel lens having any of these functions may be used, in which the positive refracting power in the paper surface of FIG. 3 is larger than the positive refracting power in the direction perpendicular to the paper surface. If the dispersion angle α of the light diffracted and dispersed by the hologram array 5 is about ± 15 ° or more, in order to make all the dispersed light enter the projection lens 18, an excessively large numerical aperture is required. It is not realistic because the field lens 17 is required. Therefore, it is important to set the dispersion angle of the hologram array 5 to ± 15 ° or less. Of course, the color liquid crystal display device shown in FIG. 2 may be used as the liquid crystal display device 11 of FIG.

By the way, when the liquid crystal display element 6 of FIG. 1 is viewed from the back side, the arrangement of pixels is as shown in FIG. However, FIG. 4 shows only the arrangement of pixels in one column. The pixel opening 20 has a size of, for example, 65 μm in length and 240 μm in width, and is 35 μm in the vertical direction and 60 μm in the horizontal direction.
For example, they are regularly arranged in the vertical and horizontal directions across the matrix 4 in a grid pattern. As shown in the figure, these pixel openings 20 are regularly repeated in the order of a color separation pixel R for displaying red, a color separation pixel G for displaying green, and a color separation pixel B for displaying blue in the spectral direction. Are lined up. Then, the R light 21, the G light 22, and the B light 2 split by the hologram array 5
3 is also condensed in a vertically long area on the pixel openings 20 of the color-dividing pixels R, G, and B of the corresponding colors, but as shown in the drawing, for example, the light 23 of B is the color-dividing pixel B for displaying blue. Not only
In some cases, the pixel opening 20 of the color separation pixel R for displaying the adjacent red may be reached. This may be caused by the spectral characteristics of the hologram array 5 itself or by the parallelism of the backlight 3. That is, according to the spectral characteristics of the hologram array 5, the distribution of the spectral lights 21 to 23 inevitably becomes as shown in FIG. 4, the parallelism of the backlight 3 is poor, and the distribution of the spectral lights 21 to 23 is more than the theoretical value. This is the case where it spreads and enters adjacent color separation pixels of uncorresponding colors. In any case, if there is such crosstalk of the display colors, the display colors become muddy, and a faithful color image cannot be displayed.

For example, FIG. 5 shows, in the case of FIG. 4, light R incident on the color-separating pixel R for displaying red, the color-separating pixel G for displaying green, and the light-separating pixel B for displaying blue, respectively. It shows the wavelength distribution of G and B. As is clear from the figure, the wavelength distribution of the light R incident on the color separation pixel R for displaying red is
It has a small peak in the blue wavelength band as well as the red wavelength. This peak is due to the fact that the separated B light 23 is incident on the color separation pixel R. Therefore, in the case of this example, FIG.
As shown in Fig. 3, by inserting a short wavelength cut filter having a transmittance of 5% or less at a wavelength of 430 nm or less at any position in the optical path from the lamp 15 to the screen 19 in FIG. It is possible to prevent color crosstalk caused by the light that should enter the color-separating pixel B to be displayed on the adjacent color-separating pixel R, and display a faithful color image.

In the above, the color separation pixel B for displaying blue
In order to prevent blue and red crosstalk caused by the light which should be incident on the adjacent color separation pixel R, 4
Although a short wavelength cut filter having a transmittance of 5% or less for a wavelength of 30 nm or less was used, for the same reason, the light to be incident on the color separation pixel R for displaying red is incident on the adjacent color separation pixel B. This can cause blue and red crosstalk. To prevent this crosstalk, 660 nm
A long wavelength cut filter having a transmittance of 5% or less for the above wavelengths may be inserted at any position in the optical path from the lamp 15 to the screen 19 in FIG.

Further, in the case of FIG. 4, for the same reason, mutual color crosstalk may occur between the color separation pixels B and G, and between G and R. In order to prevent crosstalk between B and G, a band cut filter that cuts light in the wavelength range of 490 nm to 510 nm should be inserted in any position of the optical path from the lamp 15 to the screen 19 in FIG. Well, in order to prevent crosstalk between G and R, a band cut filter that cuts light in the wavelength range of 570 nm to 590 nm is inserted at any position in the optical path from the lamp 15 to the screen 19 in FIG. You can do it like this. As a filter that cuts light in such a desired band, for example, a hologram-type reflection filter using a Lippmann hologram (volume hologram) can be used. This filter records coherent light from the opposite direction into a volume hologram recording medium such as photopolymer to record Bragg gratings at regular intervals, and only reflects light of a predetermined wavelength determined by the lattice interval. Then, the light of that wavelength is removed from the incident light.

When two or more of the above short wavelength cut filter, long wavelength cut filter and band cut filter are used in combination, color reproducibility is further improved.

Even when the above various filters are used, when the parallelism of the backlight 3 is deteriorated and the component within ± 6 ° with respect to the traveling direction becomes 80% or less, the hologram array 5 diffracts the light. The direction of the emitted light is greatly disturbed, and color crosstalk cannot be sufficiently prevented by these filters. Therefore, as the parallelism of the backlight 3, a component within ± 6 ° with respect to the traveling direction is 8
It should be 0% or more.

As a color filter used in the color liquid crystal display device 11, the transmission hologram 7 and the microlens array 8 which have uniform interference fringes as shown in FIG. 2 and have little or no wavelength dependence of diffraction efficiency are used. In the case of using the color filter 10 as described above, if the relief type hologram constituted by the blazed holographic diffraction grating 7'as shown in FIG. 7 is used as the hologram 7, diffracted light is emitted only in a specific order, for example, the + 1st order. Since they can be concentrated, a brighter color projection image can be formed.

In order to prepare such a blazed holographic diffraction grating 7 ', for example, Japanese Patent Publication No.
No. 40846, a relief diffraction grating is holographically formed on the photoresist surface, an ion beam is made incident on the diffraction grating surface from a diagonal direction perpendicular to the grating, and a relief grating is formed by reactive ion beam etching. The master may be prepared by cutting one side of the ridge to be flat, and the master may be reproduced by injection molding or the like.

The liquid crystal projection display device using the hologram color filter of the present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments and various modifications can be made.

[0042]

As is apparent from the above description, according to the liquid crystal projection display device using the hologram color filter of the present invention, the incident light is diffracted into a predetermined spatial light as a color filter of the color liquid crystal display device. A hologram that emits light of different wavelength bands in a cycle is used, and a field lens is arranged near the emission side of the color liquid crystal display device, so that the utilization efficiency of the illumination light of the projection device is significantly improved, and color unevenness is prevented. It has good color reproducibility and can faithfully display and display color images.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display device incorporating a hologram color filter of a first embodiment.

FIG. 2 is a sectional view of a liquid crystal display device incorporating a hologram color filter of a second embodiment.

FIG. 3 is a sectional view showing a configuration of a liquid crystal projection display device according to the present invention.

FIG. 4 is a view of the liquid crystal display element of FIG. 1 seen from the back side to show the arrangement of pixels.

FIG. 5 is a diagram showing an example of a wavelength distribution of light incident on each color separation pixel.

FIG. 6 is a diagram showing an example of transmittance characteristics of a short wavelength cut filter.

7 is a cross-sectional view of a main part of a hologram using a blazed holographic diffraction grating as the hologram of FIG.

FIG. 8 is a diagram for explaining a conventional illumination method for a liquid crystal display device.

[Explanation of symbols]

 3 ... Backlight 4 ... Black matrix 5 ... Hologram array (color filter) 5 '... Micro hologram 6 ... Liquid crystal display element 6' ... Liquid crystal cell (pixel) 7 ... Hologram 7 '... Blazed holographic diffraction grating 8 ... Micro Lens array 8 '... Micro lens 10 ... Color filter 11 ... Color liquid crystal display device 12, 13 ... Polarizing plate 14 ... Illumination device 15 ... Metal halide lamp 16 ... Parabolic mirror 17 ... Field lens 18 ... Projection lens 19 ... Screen 20 ... Pixel aperture 21 ... R light 22 ... G light 23 ... B light

Claims (14)

[Claims] 1. A liquid crystal projection display device for enlarging and projecting an image displayed on a color liquid crystal display device onto a screen by a projection optical system and displaying the incident light as a color filter of the color liquid crystal display device by diffracting and splitting incident light. Liquid crystal projection display device using a hologram color filter characterized by using a hologram that emits light of different wavelength bands in the spatial cycle of the above, and arranging a field lens near the emission side of the color liquid crystal display device. . 2. A liquid crystal projection display device using a hologram color filter according to claim 1, wherein the hologram has a dispersion angle of ± 15 ° or less. 3. The liquid crystal projection display device using a hologram color filter according to claim 1, wherein the hologram has a spectral function and a light condensing function. 4. The hologram color according to claim 1, wherein the hologram has a spectral function, and the color liquid crystal display device is provided with a condensing optical element in combination with the hologram. Liquid crystal projection display device using a filter. 5. The hologram having the spectral function described above,
5. A liquid crystal projection display device using a hologram color filter according to claim 4, which comprises a blazed holographic diffraction grating. 6. The field lens according to claim 1, wherein the field lens is a Fresnel lens.
A liquid crystal projection display device using the hologram color filter according to the item. 7. The hologram color according to claim 1, wherein a cut filter having a transmittance of 5% or less in a desired wavelength region is arranged in an optical path from the light source to the screen. Liquid crystal projection display device using a filter. 8. The optical path from the light source to the screen has 4
8. A liquid crystal projection display device using a hologram color filter according to claim 7, further comprising a short wavelength cut filter having a transmittance of 5% or less at a wavelength of 30 nm or less. 9. In the optical path from the light source to the screen, 6
9. A long wavelength cut filter having a transmittance of 5% or less at a wavelength of 60 nm or more is arranged.
A liquid crystal projection display device using the hologram color filter described. 10. In the optical path from the light source to the screen,
5% transmittance at wavelengths between 490 nm and 510 nm
The liquid crystal projection display device using a hologram color filter according to claim 7, wherein the following band cut filter is arranged. 11. In the optical path from the light source to the screen,
5% transmittance for wavelengths between 570 nm and 590 nm
A liquid crystal projection display device using the hologram color filter according to claim 7, wherein the following band cut filters are arranged. 12. The liquid crystal projection display device using a hologram color filter according to claim 10, wherein the band cut filter is a hologram type reflection filter. 13. The liquid crystal projection using the hologram color filter according to claim 1, wherein the hologram is arranged on the light source side of a polarizing plate on the incident side of the color liquid crystal display device. Display device. 14. The parallelism of the illumination light of the hologram is
A liquid crystal projection display device using a hologram color filter according to any one of claims 1 to 13, wherein a component within ± 6 ° with respect to the traveling direction is 80% or more.