JPH10111539A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the degradation of contrast of a projected image due to a fact that polarizing beam splitters can not obtain satisfactory polarization separating characteristics with respect to lights of all wavelength regions. SOLUTION: A light from a light source pass through an integrator 2, a field lens 3 and a relay lens 4 to be coloringly resolved into respective color lights by dichroique lenses 5, 6. Respective coloringly resolved lights pass through field lenses 7R, 7G, 7B to be respectively polarizingly separated into two polarized lights by polarizing beam splitters 8R, 8G, 8B. Polarized lights of one side of respective color lights are modulated by light bulbs 9R, 9G, 9B. Modulated lights of respective color lights are detected by the polarizing beam splitters 8R, 8G, 8B and the detected color lights are coloringly synthesized by a dichroic prism 10 to be projected on a screen by a projecting lens 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device for projecting an image formed on a liquid crystal light valve onto a screen.

[0002]

2. Description of the Related Art A conventional example of a full-color projection type display device using a reflection type light valve is disclosed in JP-A-63-392.
An apparatus described in Japanese Patent Application Publication No. 94 is known. FIG. 8 shows a configuration diagram of the conventional projection display device, and the projection display device will be described with reference to FIG.

In FIG. 8, reference numeral 211 denotes a color separation optical system. The color separation optical system 211 includes a first prism 211A, a second prism 211B, and a third prism 211C arranged as shown in FIG. . First prism 21
A dichroic thin film that reflects blue light and transmits light in a longer wavelength range than the blue light is deposited on the surface 211e of 1A. A gap is formed between the first prism 211A and the second prism 211B. A dichroic thin film that reflects red light and transmits green light is deposited on a surface 211f between the second prism 211B and the third prism 211C. Therefore, when white light is incident on the surface 211a, blue light is reflected on the surface 211e, and this blue light is further totally internally reflected on the surface 211a, and the emission surface 211b
Head for. The red light of the light transmitted through the surface 211e is
The light is reflected by the surface 211f, and is totally internally reflected by the surface in contact with the gap, and travels toward the emission surface 211c. Of the light transmitted through the surface 211e, green light is transmitted through the surface 211f, and
Head to 11d. 8, 212, 213, 21
Reference numeral 4 denotes a two-dimensional reflective liquid crystal element (light valve) for displaying a blue component video, a red component video, and a green component video in this order. Note that these light valves 212 and 21
Reference numerals 3 and 214 each have a structure in which reflective layers 215, 216, and 217 made of dielectrics are formed on the back surface of the transmission light valve, respectively, and are configured as reflection light valves. In FIG. 8, reference numeral 221 denotes a polarization beam splitter, which is disposed on the setting optical axis O of the color separation optical system 211. Reference numeral 222 denotes a collimation lens, and a white light source 223 such as a halogen lamp is arranged almost on the focal point of the collimation lens 222.

In the conventional projection display apparatus having the above-described configuration, the light beam emitted from the white light source 223 enters the collimation lens 222 to become a parallel light beam, and the S-polarized light reflected by the polarization beam splitter of the polarization beam splitter 221. Is incident on the color separation optical system 211. Color separation optical system 21
The linearly-polarized light (S-polarized light) incident on the light source 1 is color-separated into each color light, and the light valves 212, 213, and 214 for each color light
, Respectively, are spatially modulated by the video signals of the respective color lights, are reflected by changing the polarization direction by 90 degrees, are reversed in the optical path, are color-combined by the color separation optical system 211, and
11a, the component (P
(Polarized light component) is detected by the polarizing beam splitter 221 and transmitted therethrough.
25 is projected.

[0005]

However, the conventional projection display device has the following problems. That is, in the conventional projection display device, the white light source 2
Polarization beam splitter 22 for separating the light from
1 is that, since the wavelength region that needs to be polarized light separation is white light, polarization separation must be achieved for all wavelength regions. However, it is practical to perform good polarization separation in all wavelength regions. However, there is a problem that the contrast of the projected image is degraded in a certain wavelength range.

In the conventional projection display device, the light from the light source is polarized and separated by the polarization beam splitter 221, and one of the separated lights is subjected to color separation and color synthesis, thereby obtaining the color synthesized light. Is analyzed by the polarization beam splitter 221, so that, in the prisms 211 A, 211 B, and 211 C for performing color separation and color synthesis, if the polarization plane is rotated, the contrast of the projected image is degraded. . In order to prevent the polarization plane from rotating in the prism, it is necessary to use a material that minimizes birefringence (distortion) as the optical glass constituting the prism. I couldn't avoid it. Furthermore, even if this material is used, the birefringence cannot be completely eliminated, and as a result, the contrast of the projected image has been reduced.

The present invention has been made in view of such circumstances, and the contrast of a projected image caused by the inability of a polarizing beam splitter to obtain good polarization separation characteristics with respect to light in all wavelength ranges has been developed. It is an object of the present invention to provide a projection display device capable of preventing deterioration.

Another object of the present invention is to provide a projection type display device capable of preventing deterioration of the contrast of a projected image due to birefringence of an optical system for performing color synthesis.

[0009]

According to a first aspect of the present invention, there is provided a projection display apparatus comprising: a light source for separating light from a light source into first, second, and third color lights; A color separation optical system comprising a plurality of dichroic mirrors arranged substantially parallel to each other, first, second, and third light valves; and color separation by the color separation optical system. The first, second, and third polarization beam splitters provided corresponding to the first, second, and third color lights, respectively, and a plurality of dichroic mirrors arranged substantially parallel to each other or substantially parallel to each other. A color combining optical system comprising an L-shaped dichroic prism having a plurality of dichroic films disposed therein; and a projection optical system, wherein the first, second and third polarization beam splitters are arranged to be provided with the color separation optical system. Color in the system First, second and third color light polarized separated into two polarized light, said first, second and third light valves, the first, second and third, which is a solution
First and second polarization separated by the polarization beam splitter
And the first, second, and third polarization beam splitters respectively modulate one of the polarized lights of the first, second, and third color lights, and the first, second, and third light beams are modulated by the first, second, and third light valves.
The second and third color lights are respectively analyzed, and the color combining optical system colors the first, second and third color lights analyzed by the first, second and third polarization beam splitters. Combining, the projection optical system projects the light that is color-combined by the color-combining optical system, and an integrator and a first light-emitting device between the light source and the color separation optical system in order from the light source side. A field lens and a relay lens are disposed, and second, third, and fourth field lenses are disposed for each color between the color separation optical system and the first, second, and third light valves. It was done.

A projection display apparatus according to a second aspect of the present invention is a color separation optical system that separates light from a light source into first, second, and third color lights, and is disposed substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, and the projection optical system projects the light combined by the color-combination optical system, and the light source and the color separation optics are combined. A fly-eye integrator is arranged between the color separation optical system and the first, second and third light valves for each color. Field lenses are arranged respectively.

The projection display apparatus according to a third aspect of the present invention is the projection display apparatus according to the first or second aspect, wherein the first, second, and third polarization beam splitters, The second and third light valves and the color synthesizing optical system are arranged such that a principal ray determined by an aperture stop of the projection optical system has a telecentric property.

A projection display apparatus according to a fourth aspect of the present invention is the projection display apparatus according to the first or second aspect, wherein the first, second and third polarization beam splitters and the first and second polarization beam splitters are provided. The second and third light valves are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity.

A projection display apparatus according to a fifth aspect of the present invention is a color separation optical system that separates light from a light source into first, second, and third color lights, and is disposed substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, and the first, second, and third light beams are combined. A third polarizing beam splitter, the first, second, and third light valves and the color combining optical system are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. Things.

A projection type display apparatus according to a sixth aspect of the present invention is a color separation optical system for separating light from a light source into first, second and third color lights, which are arranged substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, and the first, second, and third light beams are combined. The third light valve is one in which a principal ray determined by an aperture stop of the projection optical system has a telecentric property.

A projection display apparatus according to a seventh aspect of the present invention is a color separation optical system that separates light from a light source into first, second, and third color lights, and is disposed substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, the projection optical system projects the light that is color-combined by the color-combination optical system, and the color-combination optical system includes: The principal ray determined by the aperture stop of the projection optical system is arranged at a position having telecentricity.

A projection display apparatus according to an eighth aspect of the present invention is a color separation optical system for separating light from a light source into first, second, and third color lights, and is disposed substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, and the first, second, and third light beams are combined. A third polarizing beam splitter is arranged at a position where a principal ray determined by an aperture stop of the projection optical system has telecentricity.

A projection display according to a ninth aspect of the present invention is a color separation optical system for separating light from a light source into first, second, and third color lights, and is disposed substantially parallel to each other. A color separation optical system composed of a plurality of dichroic mirrors, first, second and third light valves, and first, second and third color lights separated by the color separation optical system. An L-shaped dichroic prism having first, second and third polarizing beam splitters respectively provided and a plurality of dichroic mirrors arranged substantially parallel to each other or a plurality of dichroic films arranged substantially parallel to each other And a projection optical system, wherein the first, second and third polarization beam splitters are first, second and third color-separated by the color separation optical system. Third color light Is polarized separated into two polarized light, said first, second and third light valves, the first, second
And one of the first, second, and third color lights polarized and separated by the third polarization beam splitter, respectively, and the first, second, and third polarization beam splitters modulate the first, second, and third polarization beam splitters. The first, second, and third color lights modulated by the first, second, and third light valves are respectively analyzed, and the color combining optical system includes the first, second, and third polarization beams. The first, second, and third color lights detected by the splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, and the first, second, and third light beams are combined. A third polarizing beam splitter and the first, second and third light valves are arranged at a position where a principal ray determined by an aperture stop of the projection optical system has telecentricity.

According to the first to ninth aspects, after the light from the light source is color-separated into each color light by the color separation optical system,
Each of the color-separated color lights is polarized by each of the polarization beam splitters provided corresponding to each of the color lights, and the polarized light of each of the color lights is modulated by each of the light valves. The light is analyzed by each polarization beam splitter. As described above, since each of the polarization beam splitters separates each color light after color separation instead of white light, each polarization beam splitter performs polarization separation only on light in a narrow band wavelength range. Become. Therefore, since the wavelength range of light to be polarization-separated in each polarization beam splitter is limited to a narrow band,
The polarization separation characteristics of each polarization beam splitter can be improved, and as a result, the contrast of the projected image can be improved.

According to the first to ninth aspects,
After the modulated light of each color light emitted from each light valve is analyzed by each polarizing beam splitter provided for each color light, the analyzed light of each color light is synthesized by a color synthesis optical system. Therefore, when each color light passes through the prism member constituting the color combining optical system, even if the polarization direction of each color light changes due to the birefringence due to distortion or the like possessed by the prism member, the above-described conventional method is used. Since the light is not analyzed after the color combination unlike the projection display device, the contrast of the projected image does not deteriorate. As described above, since the birefringence of the prism member constituting the color combining optical system has no effect on the contrast of the projected image, an expensive material having a small birefringence is used as the material constituting the prism member. This eliminates the need to use the same, and can reduce costs.

By the way, since the performance of the light valve has an angle dependence, if the incident angle of the principal ray to the light valve differs depending on the place, the unevenness of the contrast of the projected image occurs due to this. In addition, the performance of the polarization beam splitter used for polarization and analysis also has an angle dependence, and if the angle of incidence of the principal ray on the polarization splitting surface of the polarization beam splitter varies depending on the location, this causes Contrast unevenness also occurs. Further, in a dichroic film used in a dichroic mirror or a dichroic prism used as a color synthesizing optical system, its spectral characteristics have an angle dependence. Therefore, if the incident angle of the principal ray to the dichroic film determined by the aperture stop of the projection optical system differs depending on the location, the spectral characteristics of the dichroic film differ for each principal ray, and color shading occurs on the screen.

In this regard, according to the third and fifth aspects, the first, second and third polarizing beam splitters,
Since the first, second and third light valves and the color synthesizing optical system are arranged at positions where the principal ray determined by the aperture stop of the projection optical system has telecentricity, the primary light valve Contrast unevenness of the projected image due to the incident angle characteristic of the light beam, contrast unevenness of the projected image due to the incident angle characteristic of the principal ray of the polarizing beam splitter, and color caused by the incident angle characteristic of the principal ray of the color combining optical system Shading can be eliminated.

According to the fourth and ninth aspects,
The first, second, and third polarizing beam splitters and the first, second, and third light valves are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. Therefore, it is possible to eliminate unevenness in contrast of the projected image caused by the incident angle characteristic of the principal ray of the light valve and unevenness of the projected image caused by the incident angle characteristic of the principal ray of the polarizing beam splitter.

According to the sixth aspect, the first, second, and third light valves are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. Therefore, it is possible to eliminate the uneven contrast of the projected image due to the incident angle characteristic of the principal ray of the light valve.

Further, according to the seventh aspect, since the color synthesizing optical system is arranged at a position where the principal ray determined by the aperture stop of the projection optical system has telecentricity, the color synthesizing optical system is arranged. It is possible to eliminate color shading caused by the incident angle characteristic of the principal ray of the system.

Further, according to the eighth aspect, the first, second, and third polarizing beam splitters are arranged such that the principal ray determined by the aperture stop of the projection optical system has a telecentric property. With the arrangement, it is possible to eliminate unevenness in the contrast of the projected image due to the incident angle characteristic of the principal ray of the polarizing beam splitter.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projection type display device according to the present invention will be described in detail with reference to the drawings.

(First Embodiment) First, the first embodiment of the present invention will be described.
The projection type display device according to the embodiment will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a schematic configuration diagram showing a projection type display device according to a first embodiment of the present invention. FIG. 2 shows FIG.
FIG. 3 is a ray diagram showing a state of rays in the projection display device shown in FIG.

In the projection type display device according to the present embodiment,
As shown in FIG. 1, a light source 1 includes a lamp 1a and the lamp 1a.
a of a red light (R light), a blue light (B light), and a green light (G light).
Is emitted. Note that the lamp 1a is arranged at a nearer focal point (first focal point) of the elliptical mirror 1b. The light source light emitted from the light source 1 is condensed at a far focal point (second focal point) of the elliptical mirror 1b, and enters the rod integrator 2 from the incident end face thereof. The rod integrator 2 is formed of a rectangular parallelepiped transparent optical glass member having a rectangular cross section. The incident end face of the rod integrator 2 is located at a far focal position of the elliptical mirror 1b. The light incident on the rod integrator 2 is repeatedly reflected on its inner surface and then emitted from the end surface facing the incident end surface of the rod integrator 2, and a surface light source having a uniform light intensity distribution is formed on the emission end surface. . In other words, the output end face is illuminated in a superimposed manner with light from virtual images of a plurality of light sources formed at the position of the incident end face by internal reflection of the rod integrator 2.

The light emitted from the emission end face of the rod integrator 2 and traveling to the left in the drawing passes through the first field lens 3, further passes through the relay lens 4, and enters the B light reflecting dichroic mirror 5 at an incident angle. Incident at 45 degrees. Among the light incident on the B light reflecting dichroic mirror 5, the B light is reflected by the mirror 5, travels upward in the drawing on an optical axis orthogonal to the incident axis, and passes through the second field lens 7B. B light polarizing beam splitter 8B
Is incident on. On the other hand, the B light reflecting dichroic mirror 5
R light and G light out of the light incident on the R light go straight to the left in the figure as they are and enter the R light reflecting dichroic mirror 6 at an incident angle of 45 degrees. The R light of the light incident on the R light reflecting dichroic mirror 6 is reflected by the mirror 6 and travels upward in the drawing on an optical axis orthogonal to the incident axis.
The light enters the polarization beam splitter 8R for R light via the third field lens 7R. The G light of the light incident on the R light reflecting dichroic mirror 6 passes through the R light reflecting dichroic mirror 6 and proceeds leftward as it is in the figure, and passes through the fourth field lens 7G for G light polarization. The light is incident on the beam splitter 8G. In this way, the dichroic mirrors 5, 5
Due to 6, the light from the light source 1 is color-separated into R light, G light, and B light. That is, in the present embodiment, the dichroic mirrors 2 and 6 constitute a color separation optical system.

The B light, R light, and G light respectively incident on the polarization beam splitters 8B, 8R, and 8G are separated by the polarization beam splitters 8B, 8R, and 8G by the polarization beam splitters 8B, 8R, and 8G. P penetrating through
The light is polarized and separated into polarized light and S-polarized light reflected by the polarized light separating unit. In the present embodiment, the P-polarized light of each color light that has been polarization-separated is discarded, and the reflected S-polarized light of each color light is used as the polarized light beam splitter 8B, 8R for each color light.
8G, and each of the polarization beam splitters 8B, 8R, 8
The light enters the reflective light valves 9B, 9R, and 9G for the respective color lights, which are respectively disposed near the emission surface of G.

Here, a reflection type light valve, in particular, an electric writing type reflection type light valve employed as the light valves 6R, 6G, 6B in the present embodiment will be described with reference to FIG. However, in the present invention, it is a matter of course that an optical writing type reflective light valve may be employed as the light valves 6R, 6G, 6B.
FIG. 7 is a schematic cross-sectional view showing an example of an electric writing type reflective light valve. As shown in FIG. 7, a transparent glass substrate 301,
A transparent ITO electrode 302, a liquid crystal alignment film 303, a TN liquid crystal layer 304, a liquid crystal alignment film 305, a reflective electrode 306, and a conductor 3 connecting between the reflective electrode 306 and the TFT drain 312.
07, 308, TFT drain 312, TFT gate 3
10, a TFT source 311, a TFT oxide layer 309, and a silicon substrate 313. In FIG. 7, 3
14 is a TFT source diffusion region, and 315 is a TFT drain diffusion region. When a voltage is applied to the gate 310, the TFT switches and a voltage is applied between the electrode 306 and the counter electrode 302 via the drain 312, and the liquid crystal molecules at that location are arranged in parallel with each other. The liquid crystal layer 304 at that location functions as a 波長 wavelength plate. For this reason, the polarized light that has entered the position becomes circularly polarized light, enters the metal reflective electrode 306, and
The light is reflected in the opposite direction by 6 and again passes through the liquid crystal 304 to be emitted as polarized light having a polarization direction shifted from the circularly polarized light by 90 degrees from the incident light. On the other hand, gate 31
At a position where no voltage is applied to 0, no electric field is generated between the electrode 306 and the counter electrode 302 because the TFT is not switched, the liquid crystal molecules are aligned along the alignment films 303 and 305, and the incident light is The light is rotated and incident according to the liquid crystal molecules, is reflected by the metal electrode 306, is again rotated according to the twist of the liquid crystal molecules, and is emitted as polarized light having the same polarization direction as the incident light. Polarized light whose polarization direction deviates by 90 degrees from the polarization direction of the incident light can be emitted only at the locations selected in this way. The above is the function of the electric writing type reflection type light valve. The electric writing type reflection type light valve basically converts the polarization direction of the reflected outgoing light at an electrically selected location to a polarization direction different from the incident light. It has a function to make In the case of an electric writing type reflective light valve having such a structure, the TFT is connected to the electrode 3
06 can be placed below the electrode 306.
Can have a large area, and the aperture ratio can be significantly increased.

The S-polarized R light, G light and B light, which are color-separated by the dichroic mirrors 5 and 6 and enter the light valves 9R, 9G and 9B via the polarization beam splitters 8B, 8R and 8G, respectively, are images for each color. The light is modulated and reflected by the signal, is emitted as modulated light from each of the light valves 9R, 9G, and 9B, and is again incident on the polarization beam splitters 8R, 8G, and 8B. As can be understood from the above-described principle of the electric writing type reflective light valve, the modulated light of each color has a P-polarized light where a voltage is applied in accordance with an image signal for each color and a light where no voltage is applied. Of S-polarized light. The modulated lights that have entered the polarization beam splitters 8R, 8G, and 8B are respectively analyzed by the polarization beam splitters 8R, 8G, and 8B. That is, P of the modulated light of each color
Only the polarized light travels through the polarization beam splitters 8R, 8G, and 8B toward the dichroic prism 10 as a color combining optical system (that is, is analyzed), and the S-polarized light of the modulated light of each color is polarized. Beam splitter 8R, 8
The light is reflected by the G and 8B polarization separation units and is discarded.

Each of the polarization beam splitters 8B, 8R, 8G
The analysis light of each color emitted from is input to the dichroic prism 10 as the color separation optical system.

In the present embodiment, the dichroic prism 10 as the color synthesizing optical system includes prism members 10-1, 10-2, and 10-3 each having a B light reflecting dichroic film 10B and an R light reflecting dichroic film 10R. The two films 10B and 10R are arranged so as to be 45 degrees with respect to the optical axis and sandwiched between them, thereby forming an L-shaped dichroic prism having an L-shaped overall shape. That is, the dichroic prism 10 has dichroic films 10B and 10R arranged in parallel with each other.

The modulated light of the B light emitted from the polarization beam splitter 8B in the left direction in the drawing enters the prism member 10-1 and travels through the prism member 10-1 in the left direction in the drawing.
The B light is reflected by the dichroic film 10B, changes its optical axis to a right angle, travels in the prism member 10-2 in the upward direction in the figure, and exits from the prism member 10-2 in the upward direction in the figure. The modulated light of the R light emitted from the polarization beam splitter 8R in the left direction in the drawing enters the side surface of the prism member 10-2, travels to the left in the drawing, and is reflected by the R light reflecting dichroic film 10R. The axis is changed to a right angle, the light travels through the prism member 10, passes through the B light reflecting dichroic film 10 </ b> B, passes through the prism member 10-1, and passes from the prism member 10-1 to the optical axis of the modulated light of the B light. The light is emitted upward in the figure with the same optical axis as. The modulated light of the G light emitted from the polarizing beam splitter 8G in the upward direction in the figure enters the prism member 10-3, passes through the dichroic film 10R, and passes through the prism member 10-2 as it is in the upward direction in the figure. The light advances, passes through the dichroic film 10B, passes through the prism member 10-1, and is emitted from the prism member 10-1 at the same optical axis as the optical axis of the modulated light of the B light and the R light.
As described above, the modulated light of each color light is color-combined. And
The combined light emitted from the dichroic prism 10 in the upward direction in the drawing enters the projection lens 11 and is projected on a screen (not shown) by the projection lens 11.

In this embodiment, the light valve 9 for each color light is emitted from the emission end face of the rod integrator 2.
The optical path lengths to R, 9G and 9B are set equal to each color light, and the optical path lengths from the color light valves 9R, 9G and 9B to the projection lens 11 are set equal to each color light.

Next, referring to FIG. 2, the state of light rays in the projection type display device according to the present embodiment will be described.

As shown in FIG. 2, the projection lens 11 includes an aperture stop 11a, a front lens group located closer to the dichroic prism 10 (that is, a lower side in the figure) than the aperture stop 11a, and an aperture stop 11a. And a rear group lens located on the screen side (upper side in the figure) not shown.
The aperture stop 11a is arranged at the focal point on the rear side (the screen side is the rear side) of the front group lens, and the projection lens 11 has a telecentric optical system on the dichroic prism 10 side (front side). That is, the aperture stop 1
1a, i.e., the projection lens 11
The principal ray determined by the aperture stop 11a is parallel to the optical axis on the front side of the projection lens 11. FIG. 2 shows a light ray passing through the center of the aperture stop 11a of the projection lens 11, that is, a principal ray determined by the aperture stop 11a of the projection lens 11. Reference numeral 4a in FIG. 2 denotes an aperture stop of the relay lens 4.

The light source light incident on the rod integrator 2 is emitted from the emission end face of the integrator 2 facing the incidence end face with the emission end face as a uniform light source face.
The light beam from the output end face of the rod integrator 2 is
The light enters the relay optical system including the field lens 3, the relay lens 4, and the field lenses 7B, 7R, and 7G. The dichroic mirrors 5 and 6 constituting the color separation optical system include a relay lens 4 and a field lens 7B,
7R and 7G, respectively. Enlarged real images of the emission end face of the rod integrator 2 (that is, the surface light source formed by the rod integrator 2) by the respective color lights are transmitted by the relay lens 4 to the respective color light valves 9R,
9G, 9B and the field lens 3,
7B, 7R, 7G, the light path between the field lens 3 and the emission end face of the rod integrator 2 and the light valves 9 for each color light from the field lenses 7B, 7R, 7G via the polarization beam splitters 8B, 8R, 8G.
In the optical path to R, 9G, 9B, the principal ray is parallel to the optical axis. That is, telecentricity is maintained between them. By adopting the configuration using the relay lens 4 and the field lenses 3, 7B, 7R, 7G, telecentric critical illumination is achieved for each color light valve. Further, the principal ray emitted from each color light valve 9R, 9G, 9B travels in parallel with the optical axis of each color light and passes through the dichroic prism 10 which is a color synthesizing optical system to maintain telecentricity. The light enters the projection lens 11 as it is.

With the above optical system, as shown in FIG. 2, the projection lens 11 and the light valves 9R, 9
G, 9B, light path for each color light, 9R, 9
G, 9B and the optical path between the field lenses 7B, 7R, 7G and the optical path between the field lens 3 and the exit end face of the rod integrator 2, the projection lens 1
The principal ray determined by one aperture stop 11a is parallel to the optical axis and maintains telecentricity. In other words, each of the dichroic prism 10, the polarization beam splitters 8R, 8G, 8B, and the light valves 9R, 9G, 9B constituting the color synthesizing optical system is such that the principal ray determined by the aperture stop 11a of the projection lens 11 is telecentric. It is arranged in a position having the property.

The dichroic films 10R and 10B for performing color synthesis by the color synthesis optical system are formed by laminating a plurality of dielectric films, and these films 10R and 10B have reflection characteristics according to the incident angle of the incident light beam. Have different characteristics.
For this reason, if the angles of incidence on the films 10R and 10B differ for each off-axis principal ray, color shading will occur on the screen. In this regard, according to the present embodiment, the dichroic prism 10 as the color combining optical system is located at a position where the principal ray has telecentricity, and therefore, is caused by the incident angle characteristic of the principal ray of the color combining optical system. Color shading does not occur.

Further, the polarization beam splitters 8R, 8G,
If the incident angle of the off-axis chief ray is different also in 8B, the polarization separation characteristics will be different, and as a result, contrast unevenness will occur in the projected image. In this regard, in the present embodiment, the polarization beam splitters 8R, 8G, and 8B for the respective color lights are used.
Since the principal ray is disposed at a position having telecentricity, the contrast unevenness of the projected image caused by the incident angle characteristic of the principal ray of the polarization beam splitters 8R, 8G, and 8B does not occur.

Further, the liquid crystal light valves 9R, 9G, 9
If the incident angle of the off-axis chief ray also differs for B, the modulation characteristics of the liquid crystal layer differ, and as a result, contrast unevenness occurs in the projected image. In this regard, in the present embodiment, the light valves 9R, 9G, and 9B are arranged at positions where the principal ray has telecentricity.
There is no contrast unevenness of the projected image due to the incident angle characteristics of the principal rays of R, 9G, and 9B.

In the present embodiment, as described above, after the light from the light source is color-separated by the dichroic mirrors 5 and 6, the color-separated color lights correspond to the respective color lights. The polarization beams splitters 8R, 8G, and 8B provided are respectively polarized, and the polarization lights of the respective color lights are modulated by the light valves 9R, 9G, and 9B, respectively.
The light is analyzed by R, 8G, and 8B, respectively. in this way,
Each of the polarization beam splitters 8R, 8G, and 8B separately polarizes and separates each color light after color separation instead of white light, so that each of the polarization beam splitters 8R, 8G, and 8B polarizes only light in a narrow wavelength band. Separation will be performed. Therefore, since the wavelength range of the light to be polarization-separated in each of the polarization beam splitters 8R, 8G, and 8B is limited to a narrow band, the polarization separation characteristics of each of the polarization beam splitters 8R, 8G, and 8B can be improved. As a result, the contrast of the projected image can be improved.

Further, in the present embodiment, as described above, the dichroic prism 10 constituting the color combining optical system includes the light valves 9R, 9G, 9B for the respective color lights.
Are emitted by the polarization beam splitters 8R, 8G, and 8B arranged for the respective color lights, and the polarized lights of the respective color lights are color-combined by the dichroic prism 10. For this reason, when each color light passes through the three prisms constituting the dichroic prism 10, the polarization direction changes due to the birefringence of the material of the prism, and the color synthesized light is converted to the dichroic prism 10. Is emitted and projected on the screen by the projection lens 11, the contrast of the projected image does not deteriorate. For this reason, it is not necessary to use a high-priced material having a small birefringence as the prism constituting the dichroic prism 10.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The projection display device according to the embodiment will be described with reference to FIG.

FIG. 3 is a schematic configuration diagram showing a projection display device according to a second embodiment of the present invention. FIG. 3 also shows the state of light rays in the projection display device. 3, the same or corresponding elements as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a projection type display device according to this embodiment.
The point different from the projection type display device according to the first embodiment shown in FIG. 2 is as follows. That is, in the projection display device according to the first embodiment, the rod integrator 2 and the first field lens 3 are provided between the light source 1 and the color separation optical system (the dichroic mirrors 5 and 6).
And the relay lens 4 are arranged, and these and the field lenses 7R, 7B, 7G constitute an illumination optical system for the light valves 9R, 9G, 9B for the respective color lights. In the present embodiment, A fly-eye integrator 22 is arranged between the light source 21 and the color separation optical system (dichroic mirrors 5 and 6), and
Polarizing beam splitter 8 for each color light as in the embodiment of FIG.
Field lens 7 placed immediately before R, 8G, 8B
R, 7G, 7B and the light valve 9R for each color light.
Both are different in that an illumination optical system for 9G and 9B is configured. In the present embodiment, the fly-eye integrator 22 includes the first and second lens plates 22a and 22a.
b, which is a so-called separated fly-eye integrator.

Further, in the present embodiment, each of the polarization beam splitters 8R, 8G, 8B is formed by the field lenses 24R, 24G, 24B disposed near the detection light exit surface of each of the polarization beam splitters 8R, 8G, 8B. A point that the principal ray determined by the aperture stop 12a of the projection lens 12 of each emitted color analysis light is not set parallel to the optical axis, and the position of the entrance pupil by the analysis light of each color is set to a finite position. This is different from the first embodiment.

Hereinafter, the projection display according to the present embodiment will be described in detail with reference to FIG.

In the projection type display device according to the present embodiment,
As shown in FIG. 3, the light source 21 includes a lamp 21a and a parabolic mirror 21b disposed behind the lamp 21a. R light, G emitted from the lamp 21a
The light source light including the light and the B light is reflected by the parabolic mirror 21b to be emitted as a substantially parallel light flux, and is incident on the first lens plate 22a constituting the fly-eye integrator 22. The first lens plate 22a has a lens matrix composed of a plurality of (5 × 6 in this embodiment) lenses on the incident surface side, and the surface opposite to the incident surface is a single surface. It is composed of a spherical surface. The first lens plate 22
The light that has exited a travels with the bending mirror 23 changing the direction of the optical axis to a right angle, and is incident on the second lens plate 22 b of the fly-eye integrator 22. The second lens plate 22b has a lens matrix including a plurality of lenses corresponding to a plurality of lenses of the lens matrix of the first lens plate 22 on an incident surface thereof.
The light emitted from the second lens plate 22b is converted into R light, G light by dichroic mirrors 5 and 6 constituting a color separation optical system.
Color separation is performed by light and B light. The R light, the G light and the B light are applied to field lenses 7R and 7R arranged for each color light.
G and 7B, respectively, and polarization beam splitters 8R and 8R
G and 8B. The polarized light of each color reflected by the polarization splitting units of the polarization beam splitters 8R, 8G, 8B is reflected by a reflection type light valve 9 arranged for each color.
R, 9G, and 9B are incident.

The first of the fly-eye integrator 22
The shape on the entrance surface side of each lens of the lens matrix on the lens plate 22a is a predetermined spherical surface, and the length / width ratio is set to be the same as the length / width ratio of the light valves 9R, 9G, 9B. Have been. The substantially parallel light source light incident on each lens of the first lens plate 22a is split by the individual lenses of the lens plate 22a, and passes through the bending mirror 23 to the lens of the second lens plate 22b. Each is focused on an individual lens of the matrix. That is, in the present embodiment, the second lens plate 22b is positioned at the focal length of the lens matrix on the first lens plate 22a.
Is arranged.

With this configuration, each lamp image by each lens of the lens matrix on the first lens plate 22a is placed on each corresponding lens of the lens matrix on the second lens plate 22b. It is formed. The lens matrix on the second lens plate 22b is arranged so that the rows and columns of the lens matrix of the first lens plate 22a match.

The individual lenses constituting the lens matrix on the second lens plate 22b are used to determine the corresponding light spots on the individual lenses of the lens matrix on the first lens plate 22a by the light valves 9R, 9G, 9B. Each light beam (sub-beam) divided by the individual lens of the first lens plate 22a has a function of forming an image on the second lens plate 22a.
Light valve 9 by each individual lens on 2b
R, 9G, and 9B are illuminated in a superimposed manner. That is, the entrance surface of each lens constituting the lens matrix on the first lens plate 22a serves as a light source and is placed on the light valves 9R, 9G, 9B by the corresponding lens of the lens matrix of the second lens plate 22b. Critical illumination is provided. Thus, the second lens plate 2
Since the light valves 9R, 9G, and 9B are superimposed by the individual lenses of the lens matrix on 2b, the uniformity of illumination by each color light to the light valves 9R, 9G, and 9B can be improved.

The two light beams shown by solid lines in FIG. 3 and emitted from the lamp 21a of the light source 21 travel in parallel with the optical axis by the parabolic mirror 21b of the light source 21, and the first light beams on both sides of the optical axis. It is assumed that the light enters with a width of one lens of the lens matrix on the lens plate 22a. As can be seen from the above description, the two light beams are condensed on the lens on the lens matrix corresponding to the lens on the first lens plate 22a on the second lens plate 22b. The two light beams that have passed through the lens of the second lens plate 22b travel with a predetermined spread, and the dichroic mirrors 5,
R, G, and B lights are separated by a color separation optical system composed of R, G light through a field lens 7R, G light through a field lens 7G, and B light into a field lens. The light beams become parallel to the optical axis via the lens 7B, respectively, and become the polarization beam splitters 8R, 8G,
8B.

The R light, G light and B light respectively incident on the polarization beam splitters 8R, 8G and 8B are respectively polarized and separated by the polarization beam splitters of the polarization beam splitters 8R, 8G and 8B. The S-polarized light of each color light reflected from the light valves 9R, 9G, 9B
Are modulated by the light valves 9R, 9G, 9B, respectively, and the modulated lights reflected by the light valves 9R, 9G, 9B are again polarized beam splitters 8R, 8G, 8
B and the polarization beam splitters 8R and 8
G and 8B respectively detect light, and the detected light (P-polarized light) of each color light passes through the polarization beam splitters 8R, 8G and 8B, respectively, and is emitted therefrom. These points are the same as those in the first embodiment described above, and in these processes, the two light rays are kept parallel to the optical axis.

In the present embodiment, each of the two parallel rays, which has become the detection light of each of the color lights, exits the polarization beam splitters 8R, 8G, and 8B and then enters the entrance pupil set at a finite position. Based on the design of condensing light at a position, the light travels with a predetermined NA instead of being parallel to the optical axis. This NA
Are secured by the field lenses 24R, 24G, 24
B, both rays of the analysis light of each color light travel with the NA after passing through the field lenses 24R, 24G, 24B. The field lens 24
Both light beams of the detection light beams of the respective color lights traveling through the R, 24G, and 24B are incident on the L-type dichroic prism 10 to achieve three-color synthesis. Both of the color-combined light beams exit the prism 10 and are incident on the projection lens 12, and are projected on a screen (not shown) by the projection lens 12. The two light beams incident on the projection lens 12 intersect at the center of the aperture stop 12a formed at the pupil position of the projection lens 12. Thus, the projection lens 12
3 passes through the center of the aperture stop 12a, it can be understood that the two rays described above in FIG. 3 are the principal rays determined by the aperture stop 12a of the projection lens 12.

As can be seen from the above description, in the present embodiment, the projection lens 12 does not have telecentric characteristics with respect to the front side of the pupil (the L-type dichroic prism 10 for color composition).

In this embodiment, the principal ray is not parallel to the optical axis in the color synthesizing L-type dichroic prism 10, but the principal ray is parallel to the optical axis. As compared with the embodiment, there is an effect that the L-type dichroic prism for color synthesis 10 can be reduced in size.

In this embodiment, the polarization beam splitters 8R, 8G, 8B for each color light and the light valve 9
In R, 9G, and 9B, the principal ray is parallel to the optical axis, that is, the telecentricity is maintained. In other words, the polarization beam splitters 8R, 8G, 8B and the light valves 9R, 9G, 9B are arranged at positions where the principal ray determined by the aperture stop 12a of the projection lens 12 has telecentricity. Therefore, according to the present embodiment, the contrast unevenness of the projected image due to the incident angle characteristic of the principal ray of the liquid crystal layer of the light valves 9R, 9G, 9B does not occur, and the main components of the polarization beam splitters 8R, 8G, 8B are not affected. There is no contrast unevenness of the projected image due to the incident angle characteristic of the light beam.

In the present embodiment, it is needless to say that the field lenses 24R, 24G, and 24B can be eliminated to maintain the telecentricity even in the color synthesizing L-type dichroic prism 10. 1, the projection lens 12 is designed to have telecentricity in front of the projection lens 12 in the same manner as the projection lens 11 in FIG.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
The projection type display device according to the embodiment will be described with reference to FIG.

FIG. 4 is a schematic configuration diagram showing a projection type display device according to a third embodiment of the present invention. 4, elements that are the same as or correspond to elements in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

FIG. 1 shows a projection type display device according to this embodiment.
Are different from the projection display device according to the first embodiment in only the following points. That is, the first type shown in FIG.
In the configuration shown in the embodiment, the color lights separated by the dichroic mirrors 5 and 6 and incident on the polarization beam splitters 8R, 8G and 8B for the respective color lights are polarized by the polarization beam splitters 8R, 8G and 8B. The configuration is such that the S-polarized light, which is polarized and separated by the separation unit and reflected by the polarization separation unit out of the two polarization-separated linearly polarized lights, is introduced into the light valves 9R, 9G, and 9B for each color light. However, in the present embodiment, as shown in FIG. 4, the P-polarized light transmitted through the polarized light beam splitters 8R, 8G, 8B for each color light is introduced into the light valves 9R, 9G, 9B for each color light. I have.

In this embodiment, the same advantages as those of the projection type display device according to the first embodiment can be obtained.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
The projection type display device according to the embodiment will be described with reference to FIG. FIG. 5 is a schematic configuration diagram showing a projection display device according to a fourth embodiment of the present invention. 5, elements that are the same as or correspond to elements in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

FIG. 1 shows a projection type display device according to this embodiment.
The difference from the projection type display device according to the first embodiment shown in FIG. 5 is that, as shown in FIG. 5, as a color combining optical system, instead of the dichroic prism 10 in FIG. The only difference is that the light reflecting dichroic mirror 30R is used. The B light reflecting dichroic mirror 30B and the R light reflecting dichroic mirror 30R are the dichroic prism 1 in FIG.
The 0 B light reflecting dichroic film 10B and the R light reflecting dichroic film 10R are arranged at the same position. That is, in the present embodiment, the color synthesizing optical system includes the dichroic mirrors 30B and 30B arranged in parallel with each other.
0R.

In this embodiment, the same advantages as those of the projection display device according to the first embodiment can be obtained.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
The projection type display device according to the embodiment will be described with reference to FIG.

FIG. 6 is a schematic configuration diagram showing a projection type display device according to a fifth embodiment of the present embodiment. FIG. 6 also shows the state of light rays in the projection display device. 6, elements that are the same as or correspond to elements in FIGS. 3 and 5 are given the same reference numerals, and descriptions thereof are omitted.

FIG. 5 shows a projection type display device according to this embodiment.
An illumination optical system having a fly-eye integrator 22 used in the projection display according to the second embodiment shown in FIG. 3 as an illumination optical system is different from the projection display according to the fourth embodiment shown in FIG. The only point where the system is used. That is, the projection type display device according to the present embodiment uses the elements 21 to 23 in FIG. 3 instead of the elements 1 to 4 in the projection type display device shown in FIG.

In this embodiment, the same advantages as those of the projection type display device according to the first embodiment can be obtained.

While the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, in the configuration shown in each of the above-described embodiments, the polarization beam splitter 8 for each color light is used.
Of the two polarized lights separated by R, 8G, and 8B, only one polarized light (for example, S-polarized light) is introduced into the color light valves 9R, 9G, and 9B. The present invention is not limited to such a configuration. For example, for B light and R light, S-polarized light reflected by the polarization beam splitters 8B and 8R is introduced into the light valves 9B and 9R for each color light, and As for light, P-polarized light transmitted through the polarizing beam splitter 8G may be introduced into the light valve 9G.

[0076]

As described above, according to the present invention,
It is possible to prevent the deterioration of the contrast of the projected image due to the inability of the polarization beam splitter to obtain good polarization separation characteristics for light in all wavelength ranges.

Further, according to the present invention, it is possible to prevent the deterioration of the contrast of the projected image due to the birefringence of the optical system for performing the color synthesis.

Further, according to the present invention, a light valve,
By arranging the polarization beam splitter and the color combining optical system at a position where the principal ray determined by the aperture stop of the projection optical system has telecentricity parallel to the optical axis,
Contrast unevenness of the projected image due to the incident angle characteristic of the principal ray of the light valve, contrast unevenness of the projected image due to the incident angle characteristic of the principal ray of the polarizing beam splitter, and incident angle characteristic of the principal ray of the color combining optical system Can eliminate color shading due to

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a projection display device according to a first embodiment of the present invention.

FIG. 2 is a light ray diagram showing a state of light rays in the projection display device shown in FIG.

FIG. 3 is a schematic configuration diagram showing a projection display device according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a projection display device according to a third embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a projection display device according to a fourth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a projection display device according to a fifth embodiment of the present invention.

FIG. 7 is a schematic sectional view showing an example of an electric writing type reflection type light valve.

FIG. 8 is a schematic configuration diagram illustrating an example of a conventional projection display device.

[Explanation of symbols]

 1, 21 light source 2 rod integrator 3 field lens 4 relay lens 5, 6 dichroic mirror 7B, 7R, 7G polarizing beam splitter 9B, 9R, 9G light valve 10-1, 10-2, 10-3 prism member 10B, 10R dichroic Layers 11, 12 Projection lens 22 Fly eye integrator 22a First lens plate 22b Second lens plate 23 Bending mirror 24R, 24G, 24B Field lens 30R, 30B Dichroic mirror

Claims (9)

[Claims] 1. A color separation optical system for separating light from a light source into first, second, and third color lights, wherein the color separation optical system includes a plurality of dichroic mirrors arranged substantially parallel to each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarizing beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color composition optical system, and the light source and the color An integrator, a first field lens, and a relay lens are arranged in this order from the light source side between the separation optical system, and between the color separation optical system and the first, second, and third light valves. Has a second, third and fourth field lens for each color Projection display device, characterized in that arranged, respectively Re. 2. A color separation optical system for separating light from a light source into first, second and third color lights, comprising a plurality of dichroic mirrors arranged substantially parallel to each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarizing beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color composition optical system, and the light source and the color A fly-eye integrator is arranged between the color separation optical system and the first, second, and third light valves for each color between the color separation optical system and the first, second, and third light valves. 3. A projection display device, wherein three field lenses are arranged. 3. The first, second and third polarization beam splitters, the first, second and third light valves and the color combining optical system are determined by an aperture stop of the projection optical system. 3. The projection display device according to claim 1, wherein the principal ray is arranged at a position having telecentricity. 4. The first, second, and third polarization beam splitters and the first, second, and third light valves are configured such that a chief ray determined by an aperture stop of the projection optical system has telecentricity. The projection type display device according to claim 1, wherein the projection type display device is arranged at a position where the projection type display device has a projection. 5. A color separation optical system for separating light from a light source into first, second and third color lights, wherein the color separation optical system includes a plurality of dichroic mirrors arranged substantially in parallel with each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarization beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, The second and third polarizing beam splitters, the first, second, and third light valves and the color combining optical system are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. A projection type display device characterized by being performed. 6. A color separation optical system for separating light from a light source into first, second and third color lights, wherein the color separation optical system includes a plurality of dichroic mirrors arranged substantially in parallel with each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarization beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, A projection display device, wherein the second and third light valves are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. 7. A color separation optical system for separating light from a light source into first, second and third color lights, wherein the color separation optical system includes a plurality of dichroic mirrors arranged substantially in parallel with each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarization beam splitter are color-combined; the projection optical system projects the light that is color-combined by the color-combination optical system; Wherein a principal ray determined by an aperture stop of the projection optical system is arranged at a position having telecentricity. 8. A color separation optical system for separating light from a light source into first, second and third color lights, wherein the color separation optical system includes a plurality of dichroic mirrors arranged substantially parallel to each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarization beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, A projection display device, wherein the second and third polarizing beam splitters are arranged at positions where a chief ray determined by an aperture stop of the projection optical system has telecentricity. 9. A color separation optical system for separating light from a light source into first, second and third color lights, wherein the color separation optical system comprises a plurality of dichroic mirrors arranged substantially in parallel with each other. System, first, second, and third light valves, and first, second, and third light valves provided corresponding to the first, second, and third color lights separated by the color separation optical system, respectively. And a third polarizing beam splitter, a color combining optical system including a plurality of dichroic mirrors arranged substantially parallel to each other or an L-type dichroic prism having a plurality of dichroic films arranged substantially parallel to each other, and projection optics. Wherein the first, second and third polarization beam splitters polarize the first, second and third color lights separated by the color separation optical system into two polarized lights, respectively. Separating, the first, Second and third light valves, the first,
The first, second, and third polarization beam splitters respectively modulate one of the first, second, and third color lights that have been polarization-separated by the second and third polarization beam splitters. The first, second, and third polarization beam splitters The first, second and third color valves modulated by the first, second and third light valves are respectively analyzed, and the color synthesizing optical system is configured to detect the first, second and third color light. The first, second, and third color lights detected by the polarization beam splitter are color-combined, and the projection optical system projects the light that is color-combined by the color-combination optical system, The second and third polarizing beam splitters and the first, second and third light valves are arranged at positions where a principal ray determined by an aperture stop of the projection optical system has telecentricity. Projection display device.