JPH11281947A - Reflection liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal projector which can be made small-sized by reduction of the optical path or the like. SOLUTION: Light from a light source 1 is separated to R, G, and B spectral components by a spectral diffraction means, and these color light are made incident on reflection liquid crystal panels corresponding to respective color light through a PBS(polarized beam splitter), and they are modulated in these reflection liquid crystal panels by a video signal, and emitted color light is converged through this PBS by a cross dichroic prism 7 and is projected on a screen 20 trough a projection lens 8. This light is separated into prescribed bicolor light (R+G) and unicolor light (B), and the bicolor light is made incident on a 2'-th PBS 5g', and spolarized light reflected by this PBS 5g' is used as one color light (G), and p-polarized light is used as the other color light (R), The PBS consists of a narrow band PBS having a narrow band characteristic, and light is separated into prescribed bicolor light by this narrow band PBS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type liquid crystal projector, and more particularly, to a miniaturized one which has a common optical path.

[0002]

2. Description of the Related Art Conventionally, a reflection type liquid crystal projector is shown in FIG.
As shown in FIG. 5, the light emitted from the light source 1 and reflected by the reflector 2 is split into (R, G, B) color lights by two dichroic mirrors 3r and 3g, and the respective color lights are transmitted through the total reflection mirror 4. To three separate optical paths, and S-polarized light of each color light enters the reflection type liquid crystal panels 6b, 6g, 6r corresponding to the same color light via PBSs 5b ', 5g', 5r 'corresponding to each color light. The light is modulated by a video signal or the like, and the polarization plane is rotated by 90 degrees to emit P-polarized light. Each of the emitted light is condensed by a cross dichroic prism 7, and the condensed light is transmitted through a projection lens 8. Projection on the screen 20. However, this configuration requires three optical paths corresponding to each color light, so that there is a problem that the size cannot be reduced.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a reflection type liquid crystal projector which can be downsized by reducing an optical path.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the first invention is to transmit B-color light of light emitted from a light source and reflected by a reflector, and to reflect G-color light and R-color light. To separate the light into the B color light and the (R + G) color light
A first dichroic mirror that reflects the S-polarized light of the separated B color light and transmits the P-polarized light,
The S-polarized light of B-color light reflected by the first 'PBS is input and modulated by a video signal and the like, and the polarization plane is rotated by 90 degrees to produce P light.
A first reflection-type liquid crystal panel that emits polarized light, and the split (R + G) color light that enters, and the S
2 ′ PBS that reflects polarized light and transmits P-polarized light
S-polarized light of (R + G) color light reflected by the second 'PBS is input, modulated by a video signal or the like, and the polarization plane is set to 90.
A second reflective liquid crystal panel that emits P-polarized light of (R + G) color light by rotating by a degree, and a P-polarized light of (R + G) color light that is modulated by the second reflective liquid crystal panel and transmitted through the second PBS. An absorption filter that absorbs R-color light of light, and reflects P-polarized light of R-color light of P-polarized light of (R + G) -color light that has passed through the second PBS and bent in parallel with the B-color light. A second dichroic mirror, and an R parallel to the B color light.
A 3 ′ PBS that transmits P-polarized light of color light and reflects S-polarized light, and a P-polarized light of R color light that has passed through the 3 ′ PBS, modulates with a video signal and the like, and polarizes the light. 3 ′ reflection type liquid crystal panel that emits S-polarized light by rotating 90 °, and each color emitted through the first ′ PBS, second ′ PBS, absorption filter and third ′ PBS. The reflection type liquid crystal projector includes a cross dichroic prism for condensing light and a projection lens, and projects the light condensed by the cross dichroic prism onto a screen via a projection lens.

In the second invention, the light emitted from the light source and reflected by the reflector is converted into R (red), G
(Green) and B (blue) are separated into three color lights, and the same color lights are PBS.
(Polarized beam splitter), the light enters the reflection type liquid crystal panel corresponding to each color light, and the color light modulated and output by the video signal in the reflection type liquid crystal panel enters the cross dichroic prism via each PBS. In a reflective liquid crystal projector that emits light and condenses the light condensed by the cross dichroic prism onto a screen via a projection lens, the PBS is constituted by a narrow band PBS having a narrow band characteristic. And a reflection type liquid crystal projector configured to separate light into two predetermined colors.

A first dichroic mirror that transmits B-color light of light emitted from the light source and reflected by the reflector, reflects G-color light and R-color light, and splits the light into the B-color light and (R + G) -color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflective liquid crystal panel that receives the S-polarized light of B-color light reflected by the BS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R +
G) a second light receiving the color light, reflecting the S-polarized light of the same (R + G) color and transmitting the P-polarized light, and an S-polarized light of the (R + G) light reflected by the second PBS. Light enters and is modulated by a video signal and the like, and the polarization plane is rotated by 90 degrees (R
+ G) a second reflective liquid crystal panel that emits P-polarized light of color light; and a second P ′ modulated by the second reflective liquid crystal panel.
An absorption filter for absorbing the R-color light of the (R + G) -color light transmitted through the BS; and the P-polarized light of the R-color light among the P-polarized light of the (R + G) -color light that has been separated and transmitted through the second PBS. A dichroic mirror that reflects and bends parallel to the B-color light, a third PBS that transmits P-polarized light of R-color light parallel to the B-color light and reflects S-polarized light, and a third PB that reflects the S-polarized light
A 3 ′ reflective liquid crystal panel that receives P-polarized light of R-color light that has passed through S, modulates the image with a video signal, rotates the polarization plane by 90 degrees, and emits S-polarized light; and the first PBS. , A cross dichroic prism for condensing each color light emitted through the second PBS, the absorption filter and the third PBS, and a projection lens, and the light condensed by the cross dichroic prism is transmitted through the projection lens. The projector is a reflection type liquid crystal projector designed to project on a screen.

[0007] Instead of an absorption filter provided between the second 'PBS and the cross dichroic prism, a reflection type comprising a 1/2 phase difference plate provided between the first PBS and the cross dichroic prism. It is a liquid crystal projector.

The band characteristics of the narrow-band PBS are G light and B light.
The reflection type liquid crystal projector has a characteristic of reflecting S-polarized light of two color lights having continuous wavelengths such as color light.

[0009] The band characteristics of the narrow-band PBS are R color light and B color light.
The reflection type liquid crystal projector has a characteristic of reflecting S-polarized light of two color lights separated by the wavelength of the color light.

The band characteristic of the narrow band PBS is set to 1 for G color light or the like.
The reflection type liquid crystal projector has a characteristic of reflecting only S-polarized light of color light.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the same by 90 degrees, and receives the separated (R + G) color light, reflects S-polarized light of G light, and reflects P light of the same G color light.
Second having narrow band characteristics for transmitting polarized light and R-color light
And a second reflection type liquid crystal panel that receives S-polarized light of G color light reflected by the second PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. A total reflection mirror that bends P-polarized light and R-color light of G-color light transmitted through the second PBS in parallel with the B-color light;
A third PBS that reflects the S-polarized light of the R-color light parallel to the B-color light and transmits the P-polarized light of the G-color light and the R-color light, and the S-polarized light of the R-color light reflected by the third PBS is input. A third reflective liquid crystal panel that emits P-polarized light by emitting light, modulating the image with a video signal or the like, and rotating the plane of polarization by 90 degrees;
S, a cross dichroic prism for condensing each color light emitted through the second PBS and the third PBS,
This is a reflection type liquid crystal projector that includes a projection lens and projects the light condensed by the cross dichroic prism on a screen via the projection lens.

A reflection type liquid crystal projector in which a fourth PBS for aligning the polarization plane in one direction with the optical path of the light emitted from the light source and reflected by the reflector is provided.

A first dichroic mirror that transmits the B color light of the light emitted from the light source and reflected by the reflector, reflects the G color light and the R color light, and splits the light into the B color light and the (R + G) color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the same by 90 degrees, and receives the separated (R + G) color light, reflects S-polarized light of G light, and reflects P light of the same G color light.
Second having narrow band characteristics for transmitting polarized light and R-color light
And a second reflection type liquid crystal panel that receives S-polarized light of G color light reflected by the second PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. And a second dichroic mirror that reflects the R color light out of the color light transmitted through the second PBS and makes it parallel to the B color light, and transmits the P polarized light of the R color light and reflects the S polarized light. And a third PBS which receives P-polarized light of R-color light transmitted through the third PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits S-polarized light. A reflective liquid crystal panel, the first PBS, the second PBS, and the third PBS;
A reflection type, comprising a cross dichroic prism for condensing each color light emitted through the PBS and a projection lens, and projecting the light condensed by the cross dichroic prism onto a screen via the projection lens. It is a liquid crystal projector.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the same by 90 degrees, and receives the separated (R + G) color light, reflects S-polarized light of G light, and reflects P light of the same G color light.
Second having narrow band characteristics for transmitting polarized light and R-color light
And a second reflection type liquid crystal panel that receives S-polarized light of G color light reflected by the second PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. And a second dichroic mirror that reflects the R color light out of the color light transmitted through the second PBS and makes it parallel to the B color light, and reflects the S polarized light of the R light and transmits the P polarized light. A third PBS that converts the P-polarized light of the R-color light transmitted through the third PBS into a 偏光 -polarized light by 位相 phase shifting 1
The half-phase plate and the S-polarized light from the half-phase plate enter and modulate with a video signal and the like, and rotate the polarization plane by 90 degrees to obtain P.
A third reflective liquid crystal panel that emits polarized light;
A cross dichroic prism for condensing each color light emitted through the PBS, the second PBS, and the third PBS, and a projection lens. The light condensed by the cross dichroic prism is transmitted through the projection lens. It is a reflection type liquid crystal projector designed to project on a screen.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the P-polarized light of the B-color light transmitted through the first PBS, modulates the image with a video signal and the like, and polarizes the light. A 1 'reflective liquid crystal panel that emits S-polarized light by rotating 90 °, and the (R + G)
A second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the G color light, and transmitting the P-polarized light and the R color light of the G color light, and the G color light reflected by the second PBS S-polarized light is incident and modulated by a video signal, etc.
A second reflection type liquid crystal panel that emits P-polarized light by rotating by a degree, and a second dichroic mirror that reflects R-color light out of the color light transmitted through the second PBS and makes it parallel to the B-color light. A third PBS that reflects the S-polarized light of the R-color light and transmits the P-polarized light, and receives the P-polarized light of the R-color light transmitted through the third PBS, modulates it with a video signal and the like, and polarizes it. A 3 ′ reflection type liquid crystal panel that emits S-polarized light by rotating the surface by 90 degrees, the first PBS, the second PBS, and the third
A reflection type, comprising a cross dichroic prism for condensing each color light emitted through the PBS and a projection lens, and projecting the light condensed by the cross dichroic prism onto a screen via the projection lens. It is a liquid crystal projector.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. And a first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and converts the P-polarized light of the B-color light transmitted through the first PBS into １ ／ -polarized light by 位相 phase shifting. And a first reflection type liquid crystal that receives the S-polarized light from the 1/2 phase plate, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. A second PBS having a narrow-band characteristic of receiving the split (R + G) color light, reflecting the S-polarized light of G color light, and transmitting the P-polarized light and R color light of the same G light; When the S-polarized light of G color light reflected by the second PBS enters and is modulated by a video signal or the like A second reflective liquid crystal panel for light exiting the P-polarized light by rotating the polarization plane by 90 degrees, the second PBS
A second dichroic mirror that reflects the R color light out of the color light transmitted through the mirror and makes it parallel to the B color light;
A third PBS that reflects polarized light and transmits P-polarized light;
A half-phase plate that shifts the P-polarized light of the R-color light transmitted through the third PBS by a half-phase and converts it into S-polarized light;
A third reflection type liquid crystal panel that receives S-polarized light from a / 2 phase plate, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; 2 P
A cross dichroic prism for condensing each color light emitted through the BS and the third PBS, and a projection lens, and the light condensed by the cross dichroic prism is projected onto a screen via the projection lens. This is a reflection type liquid crystal projector.

The first PBS is a reflection type liquid crystal projector using the same narrow band characteristics as the second PBS.

The first dichroic mirror is replaced by a total reflection mirror, and a reflection type liquid crystal projector is provided between the total reflection mirror and the third PBS, an absorption filter for absorbing G light.

A first dichroic mirror that transmits the B light of the light emitted from the light source and reflected by the reflector, reflects the G light and the R light, and splits the light into the B light and the (R + G) light, and A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the light by 90 degrees, receives the dispersed (R + G) color light, reflects the S-polarized light of R color light, and reflects the P light of the same R color light.
A 2 ″ PBS having a narrow band characteristic that transmits polarized light and G color light, and S polarized light of R color light reflected by the 2 ″ PBS is input, modulated by a video signal and the like, and is polarized. A second reflective liquid crystal panel that emits P-polarized light by rotating the P-polarized light by 90 degrees, and the P of R-color light transmitted through the second ″ PBS.
A total reflection mirror that bends the polarized light and the G light in parallel with the B light, and a third reflection mirror that reflects the S polarized light of the G light parallel to the B light and transmits the P polarized light of the R light and the G light. P
A third reflection-type liquid crystal panel that receives the S-polarized light of G color light reflected by the BS and the third PBS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; , The first PBS, the second ″ PBS and the third PBS
A reflection type liquid crystal projector comprising a cross dichroic prism that condenses each color light emitted through the lens and a projection lens, and projects the light condensed by the cross dichroic prism onto a screen through the projection lens And

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the light by 90 degrees, receives the dispersed (R + G) color light, reflects the S-polarized light of R color light, and reflects the P light of the same R color light.
A 2 ″ PBS having a narrow band characteristic that transmits polarized light and G color light, and S polarized light of R color light reflected by the 2 ″ PBS is input, modulated by a video signal and the like, and is polarized. Out of the second reflective liquid crystal panel that emits P-polarized light by rotating 90 °, and the color light transmitted through the second ″ PBS,
A third dichroic mirror that reflects the G-color light to be parallel to the B-color light, a third PBS that reflects the S-polarized light of the G-color light and transmits the P-polarized light, and transmits through the third PBS; The third P ′ that receives the P-polarized light of G color light, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits S-polarized light.
, A cross dichroic prism for condensing each color light emitted through the first PBS, the second '' PBS and the third PBS, and a projection lens. This is a reflection type liquid crystal projector in which light condensed by a prism is projected on a screen via a projection lens.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the S-polarized light of the B-color light reflected by the first PBS, modulates it with a video signal and the like, and polarizes the light. A first reflective liquid crystal panel that emits P-polarized light by rotating the light by 90 degrees, receives the dispersed (R + G) color light, reflects the S-polarized light of R color light, and reflects the P light of the same R color light.
A 2 ″ PBS having a narrow band characteristic that transmits polarized light and G color light, and S polarized light of R color light reflected by the 2 ″ PBS is input, modulated by a video signal and the like, and is polarized. Out of the second reflective liquid crystal panel that emits P-polarized light by rotating 90 °, and the color light transmitted through the second ″ PBS,
A third dichroic mirror that reflects the G-color light to be parallel to the B-color light, a third PBS that reflects the S-polarized light of the G-color light and transmits the P-polarized light, and transmits through the third PBS; A half-phase plate that shifts the P-polarized light of the R color light by half a phase and converts it into S-polarized light, and receives the S-polarized light from the half-phase plate and modulates it with a video signal and the like. 90 polarization plane
A third reflective liquid crystal panel that emits P-polarized light by rotating the first PBS, the second PBS, and the third PB.
A reflection type liquid crystal comprising a cross dichroic prism for condensing each color light emitted through the S and a projection lens, and projecting the light condensed by the cross dichroic prism onto a screen via the projection lens. It is a projector.

A first dichroic mirror that transmits the B light of the light emitted from the light source and reflected by the reflector, reflects the G light and the R light, and splits the light into the B light and the (R + G) light, A first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and receives the P-polarized light of the B-color light transmitted by the first PBS, modulates the image with a video signal or the like, and polarizes the light. A 1 'reflective liquid crystal panel that emits S-polarized light by rotating 90 °, and the (R + G)
A second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the R-color light, and transmitting the P-polarized light and the G-color light of the R light, and a PBS of the second ''. The reflected S-polarized light of R-color light enters, is modulated by a video signal or the like, and is transmitted through the second reflective liquid crystal panel that emits P-polarized light by rotating the polarization plane by 90 degrees, and the second PBS. A third dichroic mirror that reflects the G-color light out of the color light to make it parallel to the B-color light, a third PBS that reflects the S-polarized light of the same G-color light and transmits the P-polarized light, A 3 ′ reflective liquid crystal panel that receives P-polarized light of G color light that has passed through the PBS, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit S-polarized light; Cross dichroic pump for condensing each color light emitted through PBS, second PBS and third PBS And rhythm, becomes in the projection lens, and a reflection type liquid crystal projector so as to project onto a screen through a projection lens the light condensed by the cross dichroic prism.

A first dichroic mirror that transmits the B-color light of the light emitted from the light source and reflected by the reflector, reflects the G-color light and the R-color light, and splits the light into the B-color light and the (R + G) -color light. And a first PBS that reflects the S-polarized light of the B-color light and transmits the P-polarized light, and converts the P-polarized light of the B-color light transmitted through the first PBS into １ ／ -polarized light by 位相 phase shifting. And a first reflection type liquid crystal that receives the S-polarized light from the 1/2 phase plate, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. A panel and a second ″ PBS having narrow-band characteristics of receiving the separated (R + G) color light, reflecting the S-polarized light of the R color light, and transmitting the P-polarized light and the G color light of the same R color light. When,
A second reflective liquid crystal panel that receives the S-polarized light of R-color light reflected by the second "PBS, modulates the image with a video signal, rotates the polarization plane by 90 degrees, and emits P-polarized light; The second
Out of the color light that has passed through the PBS,
A third dichroic mirror that is parallel to the color light,
A third P that reflects S-polarized light of color light and transmits P-polarized light
BS, a 位相 phase plate that shifts the P-polarized light of the G color light transmitted through the third PBS by １ ／ phase and converts it into S-polarized light, and S-polarized light from the 位相 phase plate. A third reflective liquid crystal panel that receives light, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the first PBS;
A cross dichroic prism for condensing each color light emitted through the second PBS and the third PBS, and a projection lens, and the light condensed by the cross dichroic prism is put on a screen via the projection lens. It is a reflection type liquid crystal projector designed to project.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, light emitted from a light source and reflected by a reflector has been suddenly guided to an optical path of three-color light. However, with the above-described configuration, the reflection type liquid crystal projector of the present invention has By means, predetermined two-color light (R + G) and one-color light (B) are separated, the two-color light enters the PBS, and the S-polarized light reflected by the PBS is converted to the one-color light (G) to the P-polarized light. Is used for the other color light (R), so that one optical path is reduced and downsizing can be achieved. Further, since the PBS is composed of a narrow-band PBS having a narrow-band characteristic, and the narrow-band PBS splits the light into predetermined two-color light, the PBS can also be used as a spectral unit such as a dichroic mirror, and the number of parts is reduced. Reduction and cost reduction. Further, conventionally, since the reflective liquid crystal panel disposed outside the PBS disposed on both sides of the cross dichroic prism is disposed in the direction of the projection lens,
The width can be reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A reflection type liquid crystal projector according to the present invention will be described below in detail with reference to the drawings. FIGS. 1, 2 and 4 to 13 are main part configuration diagrams of an optical system showing an embodiment of a reflection type liquid crystal projector according to the present invention. In the figure,
1 is a white light source such as a halogen lamp, and 2 is a reflector. Reference numeral 3gr denotes a first dichroic mirror, which transmits the B color light of the light emitted from the light source 1 and reflected by the reflector 2, reflects the G color light and the R color light, and outputs the same B color light and (R +
G) Disperse into color light. Reference numeral 3r denotes a second dichroic mirror that transmits light other than the R color light and reflects the R color light. Reference numeral 3g denotes a third dichroic mirror that transmits light other than the G color light and reflects the G color light. Reference numeral 4 denotes a total reflection mirror. Reference numeral 5b denotes a first PBS having a narrow-band characteristic, which is an S-beam of B-color light separated by the first dichroic mirror 3.
Reflects polarized light and transmits P-polarized light. Reference numeral 5b 'denotes a first' PBS having broadband characteristics, which reflects the S-polarized light of the B-color light separated by the first dichroic mirror 3 and transmits the P-polarized light. 5g is a second PBS having a narrow band characteristic, and the first dichroic mirror 3
Of the (G + R) color lights separated by the above, the S-polarized light of the G color light is reflected, and the P-polarized light and the R color light of the G color light are transmitted.
Reference numeral 5g 'denotes a second' PBS having a wide band characteristic, which reflects the S-polarized light of the (G + R) -color light separated by the first dichroic mirror 3 and transmits the P-polarized light. 5
g ″ is a third ″ PBS having a narrow band characteristic, which reflects the S-polarized light of the G-color light separated by the third dichroic mirror 3g and transmits the P-polarized light of the G-color light.
Reference numeral 5r denotes a third PBS having a narrow band characteristic. The third PBS reflects the S-polarized light of the R-color light among the (G + R) -color lights separated by the first dichroic mirror 3 and the P-polarized light of the R-color light and the G light.
Transmits colored light. Reference numeral 5r 'denotes a third' PBS having a broadband characteristic, which reflects the S-polarized light of the (G + R) color light which is split by the first dichroic mirror 3 and transmits the P-polarized light. 5r ″ is a second ″ PBS having a narrow band characteristic, and the first dichroic mirror 3
Of the (G + R) color lights separated by gr, the S-polarized light of the R color light is reflected, and the P-polarized light and the G color light of the R color light are transmitted. 6b is a first reflection type liquid crystal panel, and the first PB
The S-polarized light of B-color light reflected at S5b enters and is modulated by a video signal or the like, and the P-polarized light is emitted by rotating the polarization plane by 90 degrees. Reference numeral 6b 'denotes a first' reflection type liquid crystal panel, which receives P-polarized light of B-color light transmitted through the first PBS 5b, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to convert S-polarized light. It is emitting light. Reference numeral 6g denotes a second reflective liquid crystal panel, which receives the S-polarized light of the G color light reflected by the second PBS 5g, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit P-polarized light. ing. 6g 'is a 2' reflection type liquid crystal panel, and G is transmitted through the second PBS 5g.
The P-polarized light of the color light enters and is modulated by a video signal or the like, and the S-polarized light is emitted by rotating the polarization plane by 90 degrees. 6
g ″ is the third ″ reflective liquid crystal panel, the third ″
Of S-polarized light of G color light reflected by the PBS 5g ″, and is modulated by a video signal and the like, and the polarization plane is rotated by 90 degrees to generate P light.
It emits polarized light. Reference numeral 6g "" denotes a third "" reflection type liquid crystal panel, which receives P-polarized light of G color light transmitted through the third "PBS 5g", modulates it with a video signal or the like, and sets the polarization plane to 90 ". The S-polarized light is emitted after rotating by degrees.
Reference numeral 6r denotes a third reflective liquid crystal panel, which is the third PBS5.
The s-polarized light of R-color light reflected by r enters and is modulated by a video signal and the like, and the polarization plane is rotated by 90 degrees to emit P-polarized light. Reference numeral 6r 'denotes a 3' reflection type liquid crystal panel, which receives the P-polarized light of the R-color light transmitted through the third PBS 5r, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to convert the S-polarized light. It is emitting light. 6r ″ is a second ″ reflection type liquid crystal panel, and R reflected by the second ″ PBS5r ″
S-polarized light of color light enters and is modulated by a video signal and the like, and P-polarized light is emitted by rotating the polarization plane by 90 degrees. Reference numeral 7 denotes a cross dichroic prism that reflects and collects the color lights corresponding to the respective color lights entering from three directions. Reference numeral 8 denotes a projection lens which projects the light condensed by the cross dichroic prism 7 on a screen 20. Reference numeral 9 denotes an absorption filter that absorbs predetermined color light and does not transmit the light. Reference numeral 10 denotes a 1/2 phase plate that shifts the plane of polarization by 90 degrees.

For example, as shown in FIG. 1, B-color light emitted from the light source 1 and reflected by the reflector 2 is transmitted,
A first dichroic mirror 3gr that reflects the G color light and the R color light and splits the same into the B color light and (R + G) color light, and a first dichroic mirror that reflects the S split light of the separated B color light and transmits the P polarized light. 'PBS5b' and the first 'PBS5b'
The first reflection type liquid crystal panel 6b that receives the S-polarized light of the B color light reflected by the light source, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits the P-polarized light, and the separated (R +
G) The second 5 ′ PBS which receives the color light, reflects the S-polarized light of the same (R + G) color and transmits the P-polarized light, and the (R + G) light reflected by the second 5 ′ PBS 5g ′. A second reflective liquid crystal panel 6g that receives the S-polarized light, modulates it with a video signal or the like, rotates the plane of polarization by 90 degrees, and emits P-polarized light of (R + G) color light, and the second reflective liquid crystal Panel 6g
And is transmitted through the second 5 'PBS 5g' (R + G)
An absorption filter 9 for absorbing R-color light of P-polarized light of color light;
The spectrum was transmitted through 5 g 'of the second PBS (R +
G) The second dichroic mirror 3r that reflects the P-polarized light of the R-color light out of the P-polarized light of the color light and bends in parallel with the B-color light, and transmits the P-polarized light of the R-color light parallel to the B-color light. And
A third 'PBS 5r' that reflects S-polarized light;
A 3 ′ reflective liquid crystal panel 6r ′ that receives P-polarized light of R-color light transmitted through the PBS 5r ′, modulates it with a video signal or the like, and rotates the polarization plane by 90 ° to emit S-polarized light; A cross dichroic prism 7 for condensing each color light emitted through the first 'PBS 5b', the second 'PBS 5g', the absorption filter 9, and the third 'PBS 5r'.
, And a projection lens 8, and the light condensed by the cross dichroic prism 7 is projected onto a screen 20 via the projection lens 8.

As shown by the dotted line in FIG. 1, instead of the absorption filter 9 provided between the second 'PBS 5g' and the cross dichroic prism 7, the first 'PB
1 between S5b 'and the cross dichroic prism 7
A / 2 phase difference plate 10 may be provided.

Further, as shown in FIG. 2, B light of light emitted from the light source 1 and reflected by the reflector 2 is transmitted, and G light is transmitted.
A first dichroic mirror 3gr that reflects the color light and the R color light to split the light into the B color light and the (R + G) color light, and a first dichroic mirror that reflects the S polarized light of the split B light and transmits the P polarized light. A PBS 5b and a first reflective liquid crystal panel 6b that receives S-polarized light of B-color light reflected by the first PBS 5b, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. And the second P having a narrow band characteristic of receiving the separated (R + G) color light, reflecting the S light of the G color, and transmitting the P light and the R light of the same G light.
S5 of G color light reflected by 5 g of BS and 5 g of the second PBS
Polarized light enters and is modulated by video signals and the like, and the polarization plane is set to 9
A second reflective liquid crystal panel 6g that rotates by 0 degrees to emit P-polarized light, and a total reflection that bends P-polarized light and R-color light of G-color light transmitted through the second PBS 5g in parallel with the B-color light. The mirror 4 reflects the S-polarized light of the R-color light parallel to the B-color light, and is reflected by the third PBS 5r 'and the third 5'-PBS 5r', which transmit the G-polarized light and the R-polarized P-polarized light. R
A third reflective liquid crystal panel 6r that receives S-polarized light of color light, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, the first PBS 5b, and the second PB
A cross dichroic prism 7 for condensing each color light emitted through the S5g and the 3 ′ PBS 5r ′;
The light condensed by the cross dichroic prism 7 is transmitted through the projection lens 8 to the screen 2.
It is projected on 0. This first PBS 5b
For example, as shown in FIG. 3A, the second PBS 5g transmits R-color light and reflects S-polarized light of two color lights having continuous wavelengths such as G-color light and B-color light. It has band characteristics.

As shown by the dotted line in FIG. 2, a fourth PBS 5sp for aligning the polarization plane to S or P is provided in the optical path of the light emitted from the light source 1 and reflected by the reflector 2, and the polarization plane is previously adjusted. By separating white light, the light use efficiency may be increased.

As shown in FIG. 4, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, the G light and the R light are reflected and separated into the B light and the (R + G) light. 1 dichroic mirror 3gr and a first dichroic mirror 3gr that reflects the S-polarized light of the B-color light and transmits the P-polarized light.
Of the B-color light reflected by the PBS 5b
Polarized light enters and is modulated by video signals and the like, and the polarization plane is set to 9
A first reflective liquid crystal panel 6b that rotates by 0 degrees and emits P-polarized light, and the split (R + G) color light enters and G
The s-polarized light of the G color is reflected to reflect the s-polarized light of the
5 g of second PBS having a narrow band characteristic for transmitting color light
And a second reflection type liquid crystal panel 6g that receives the S-polarized light of the G color light reflected by the second PBS 5g, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits the P-polarized light.
And a second dichroic mirror 3r that reflects the R color light out of the color light transmitted through the second PBS 5g and makes it parallel to the B color light, transmits the P polarized light of the R color light, and converts the S polarized light. Reflecting 3 'PBS 5r' and 3 'PBS
A 3 ′ reflective liquid crystal panel 6r ′ that receives the P-polarized light of R color light transmitted through 5r ′, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit S-polarized light; 1 PBS5b, 2nd PBS5g and 3'PBS6
a cross dichroic prism 7 for condensing each color light emitted through the projection lens 8 and a projection lens 8, and the light condensed by the cross dichroic prism 7 is projected to the projection lens 8
Is projected on the screen 20 via the.

As shown in FIG. 5, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, and the G light and the R light are reflected and split into the same B light and (R + G) light. 1 dichroic mirror 3gr and a first dichroic mirror 3gr that reflects the S-polarized light of the B-color light and transmits the P-polarized light.
And a first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by the first PBS 5b, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. 6b and a second PBS having a narrow band characteristic of receiving the separated (R + G) color light, reflecting the S light of the G color, and transmitting the P light and the R light of the same G light.
5g and the second reflection type liquid crystal panel 6 which receives the S-polarized light of G color light reflected by the second PBS 5g, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light.
g, the second dichroic mirror 3r that reflects the R color light out of the color light transmitted through the second PBS 5g and makes it parallel to the B color light, and reflects the S polarized light of the R color light and the P polarized light. And a third PB 5r 'that transmits the
A 1/2 phase plate 10 that shifts the P-polarized light of the R-color light transmitted through S5r 'by 1/2 phase and converts it into S-polarized light;
A third reflective liquid crystal panel 6r which receives the S-polarized light from the two-phase plate 10 and modulates it with a video signal or the like, rotates the polarization plane by 90 degrees and emits P-polarized light, and the first PBS 5
b, a cross dichroic prism 7 for condensing each color light emitted through the second PBS 5g and the third 'PBS 5r', and a projection lens 8, projecting the light condensed by the cross dichroic prism 7 The image is projected on the screen 20 via the lens 8.

As shown in FIG. 6, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, the G light and the R light are reflected and separated into the same B light and (R + G) light. 1 dichroic mirror 3gr and a first dichroic mirror 3gr that reflects the S-polarized light of the B-color light and transmits the P-polarized light.
And a 5'-first reflection type liquid crystal which receives P-polarized light of B color light transmitted through the first PBS 5b, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits S-polarized light. A panel 6b 'and a second PB having a narrow band characteristic of receiving the separated (R + G) color light, reflecting the S light of the G light, and transmitting the P light and the R light of the same G light.
S5g and S-polarized light of G color light reflected by the second PBS 5g are input and modulated by a video signal or the like, and the polarization plane is set to 90 °.
A second reflection type liquid crystal panel 6g that emits P-polarized light by rotating by a degree, and a second dichroic mirror that reflects R-color light out of the color light transmitted through the second PBS 5g and makes it parallel to the B-color light. 3r, a 3 ′ PBS 5r ′ that reflects the S-polarized light of the R-color light and transmits the P-polarized light, and a third PB
A third liquid crystal panel 6r ', which receives the P-polarized light of the R-color light transmitted through S5r', modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits S-polarized light; 1
PBS5b, second PBS5g and 3'PBS
A cross dichroic prism 7 for condensing each color light emitted through 6r 'and a projection lens 8, and the light condensed by the cross dichroic prism 7 is projected on a screen 20 via the projection lens 8. Like that.

As shown in FIG. 7, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, the G light and the R light are reflected, and the B light and the (R + G) light are separated. No. 1 dichroic mirror 3gr, the first PBS 5b ′ that reflects the S-polarized light of the separated B color light and transmits the P-polarized light, and the P-polarized light of the B color light transmitted through the first PBS 5b ′. A 1/2 phase plate 10 for shifting the light by 1/2 phase to convert it into S-polarized light, and the S-polarized light from the 1/2 phase plate 10 is input and modulated by a video signal and the like, and the polarization plane is set to 90 degrees. A first reflective liquid crystal panel 6b that emits P-polarized light by rotating by a degree, and receives the split (R + G) color light, reflects G-color S-polarized light, and reflects G-colored P-polarized light. And second PBS having narrow band characteristics for transmitting R-color light
5g and the second reflection type liquid crystal panel 6 which receives the S-polarized light of G color light reflected by the second PBS 5g, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light.
g, the second dichroic mirror 3r that reflects the R color light out of the color light transmitted through the second PBS 5g and makes it parallel to the B color light, and reflects the S polarized light of the R color light and the P polarized light. And a third PB 5r 'that transmits the
A 1/2 phase plate 10 that shifts the P-polarized light of the R-color light transmitted through S5r 'by 1/2 phase and converts it into S-polarized light;
A third reflective liquid crystal panel 6r that receives the S-polarized light from the two-phase plate 10 and modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit P-polarized light;
b ′, a cross dichroic prism 7 for condensing each color light emitted through the second PBS 5g and the third PBS 5r ′, and a projection lens 8. The light condensed by the cross dichroic prism 7 is The image is projected on the screen 20 via the projection lens 8.

Further, the first PBS 5b ′ is the same as the first PBS 5b having the narrow band characteristic.
It may be.

Further, the second light reflecting the R color light shown in FIG.
The dichroic mirror 3r may be replaced with a total reflection mirror 4 and an absorption filter 9, as shown in FIG.

As shown in FIG. 9, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, the G light and the R light are reflected, and the B light and the (R + G) light are separated. 1 dichroic mirror 3gr and a first dichroic mirror 3gr that reflects the S-polarized light of the B-color light and transmits the P-polarized light.
And a first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by the first PBS 5b, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. 6b and a second ″ P having a narrow band characteristic of receiving the separated (R + G) color light, reflecting the S-polarized light of the R-color light, and transmitting the P-polarized light and the G-color light of the same R color light.
The second S-polarized light of R-color light reflected by the BS 5r ″ and the second PBS PBS 5r ″ is input and modulated by a video signal or the like, and the P-polarized light is emitted by rotating the polarization plane by 90 degrees. '' Reflective liquid crystal panel 6r '' and the second '' P
A total reflection mirror 4 that bends P-polarized light and G-color light of R-color light transmitted through BS5r ″ in parallel with the B-color light;
A 5 ″ third PBS 5 </ b> g that reflects S-polarized light of G color light parallel to the color light and transmits P-polarized light of R color light and G color light
And S of the G color light reflected by the 3 ″ PBS 5g ″
Polarized light enters and is modulated by video signals and the like, and the polarization plane is set to 9
A 3 ″ reflective liquid crystal panel 6g ″ that emits P-polarized light by rotating by 0 °, the first PBS, and the second ″ PB
A cross dichroic prism 7 for condensing each color light emitted through the S and the 3 ″ PBS, and a projection lens 8, and the light condensed by the cross dichroic prism 7 is transmitted through the projection lens 8. The image is projected on the screen 20. And the second "PBS
The band characteristic of 5r ″ is R
S of two color lights separated in wavelength, such as color light and B color light
It has the property of reflecting polarized light.

Further, as shown in FIG. 10, B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted,
A first dichroic mirror 3gr that reflects the G color light and the R color light and splits the same into the B color light and (R + G) color light, and a first dichroic mirror that reflects the S split light of the separated B color light and transmits the P polarized light. And a first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by the first PBS 5b, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light. 6b and a second ″ PBS 5r having a narrow band characteristic of receiving the split (R + G) color light, reflecting the R color light of S polarization light, and transmitting the same R color light of P polarization light and G color light. ”And the second” PBS5
a second "reflection-type liquid crystal panel 6r" which receives the S-polarized light of R-color light reflected by r ", modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; A third dichroic mirror 3g that reflects the G color light out of the color lights transmitted through the second PBS 5r ″ and makes it parallel to the B color light; The 3 ″ PBS 5g ″ that transmits polarized light and the P-polarized light of G color light that has passed through the 3 ″ PBS 5g ″ enter and modulate with video signals and rotate the polarization plane by 90 ° 3 ′ ″ reflective liquid crystal panel 6 that emits S-polarized light
g '' ′, the first PBS 5b, the second PBS 5b
A cross dichroic prism 7 for condensing each color light emitted through the 5r "and the third" PBS 5g "and a projection lens 8, and the light condensed by the cross dichroic prism 7 is a projection lens. 8 on a screen 20.

As shown in FIG. 11, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, and the G light and the R light are reflected and split into the same B light and (R + G) light. The first dichroic mirror 3gr, the first PBS 5b that reflects the S-polarized light of the separated B color light and transmits the P-polarized light, and the S-polarized light of the B color light reflected by the first PBS 5b is input. A first reflective liquid crystal panel 6b that modulates with a video signal or the like and emits P-polarized light by rotating the plane of polarization by 90 degrees, and enters the split (R + G) color light to form S-polarized R light. A second ″ P that has a narrow band characteristic of reflecting light and transmitting P-polarized light and G-color light of the same R color light.
The second S-polarized light of the R-color light reflected by the BS 5r ″ and the second PBS 5r ″ is input and modulated by a video signal or the like, and the P-polarized light is emitted by rotating the polarization plane by 90 degrees. ''
Reflective liquid crystal panel 6r ″ and the second ″ PBS5
A third dichroic mirror 3g that reflects the G color light out of the color lights transmitted through r ″ and makes it parallel to the B color light, and a third dichroic mirror 3g that reflects the S polarized light of the G color light and transmits the P polarized light. ”PBS5g” and the third ”PBS5
a half-phase plate 10 that shifts the P-polarized light of the R-color light transmitted through g ″ by 位相 phase and converts it into S-polarized light;
A third "liquid crystal panel 6g" which receives the S-polarized light from the phase plate 10, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; PB
S5b, second "PBS5r" and third "P
A cross dichroic prism 7 for condensing each color light emitted through the BS 5g ″ and a projection lens 8, and the light condensed by the cross dichroic prism 7 is projected onto a screen 20 via the projection lens 8. I am trying to do it.

As shown in FIG. 12, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, and the G light and the R light are reflected and separated into the same B light and (R + G) light. The first dichroic mirror 3gr, the first PBS 5b that reflects the split S-polarized light of the B color light and transmits the P-polarized light, and receives the P-polarized light of the B color light transmitted through the first PBS 5b. A first 'reflective liquid crystal panel 6b' that modulates with a video signal or the like and emits S-polarized light by rotating the plane of polarization by 90 degrees, and enters the dispersed (R + G) color light to form the R color light. A second ″ having a narrow band characteristic of reflecting S-polarized light and transmitting P-polarized light and G-color light of the same R color light.
And S-polarized light of R-color light reflected by the PBS 5r '' and the second '' PBS 5r '', and modulated by a video signal and the like, and the P-polarized light is emitted by rotating the polarization plane by 90 degrees. The 2 ″ reflective liquid crystal panel 6r ″ and the second ″ P
3g of a third dichroic mirror that reflects the G color light out of the color light transmitted through the BS5r ″ and makes it parallel to the B color light
A third "PBS 5g" that reflects the S-polarized light of the same G color light and transmits the P-polarized light;
A 3 ′ ″ reflection type liquid crystal panel 6g ″ that receives P-polarized light of G color light transmitted through g ″, modulates it with a video signal or the like, rotates the polarization plane by 90 °, and emits S-polarized light. , A cross dichroic prism 7 for condensing each color light emitted through the first PBS 5b, the second '' PBS 5r '' and the third '' PBS 5g '', and a projection lens 8. The light condensed by the cross dichroic prism 7 is projected onto a screen 20 via a projection lens 8.

As shown in FIG. 13, the B light of the light emitted from the light source 1 and reflected by the reflector 2 is transmitted, the G light and the R light are reflected and separated into the same B light and (R + G) light. 1, the first dichroic mirror 3gr, the first PBS 5b that reflects the S-polarized B-color light and transmits the P-polarized light, and the P-polarized light of the B-color light transmitted through the first PBS 5b is divided by 1 /. A 位相 phase plate 10 that shifts by two phases and converts it into S-polarized light, and S-polarized light from the 位相 phase plate 10 enters and modulates with a video signal and the like, and the polarization plane is 90 °.
A first reflective liquid crystal panel 6b that emits P-polarized light after being rotated by an angle, receives the split (R + G) color light, reflects R-colored S-polarized light, and reflects R-colored P-polarized light. 2 ″ PBS5 having narrow band characteristics transmitting G and G light
r ″ and S-polarized light of R-color light reflected by the second ″ PBS 5r ″ and modulated by a video signal or the like, and the polarization plane is rotated by 90 degrees to output P-polarized light. '' Reflective liquid crystal panel 6r '' and the second '' PBS 5r ''
And a third dichroic mirror 3g that reflects the G color light out of the color light transmitted through the mirror and makes it parallel to the B color light, and the third dichroic mirror 3g that reflects the S light of the same G color and transmits the P polarized light. P
A BS 5g ″, a 板 phase plate 10 that shifts the P-polarized light of the G color light transmitted through the third ″ PBS 5g ″ by １ ／ phase and converts it into S-polarized light, A third ″ reflection type liquid crystal panel 6 g ″ that receives the S-polarized light from the plate 10, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits the P-polarized light; PBS5b, second "PBS5r" and third "PBS5
g '', a cross dichroic prism 7 for condensing each color light emitted through g '', and a projection lens 8, and the light condensed by the cross dichroic prism 7 is projected onto a screen 20 via the projection lens 8. I am trying to do it.

[0041]

As described above, according to the reflection type liquid crystal projector of the present invention, the spectroscopic means separates the light into predetermined two-color light (R + G) and one-color light (B), and the same two-color light is supplied to the PBS. Since the s-polarized light that is incident on and is reflected by the PBS is used for one color light (G), and the p-polarized light is used for the other color light (R), one optical path can be reduced and downsizing can be achieved. Further, since the PBS is composed of a narrow-band PBS having a narrow-band characteristic, and the narrow-band PBS splits the light into predetermined two-color light, the PBS can also be used as a spectral unit such as a dichroic mirror, and the number of parts can be reduced. Reduction and cost reduction. Further, conventionally, since the reflection type liquid crystal panels arranged outside the PBS arranged on both sides of the cross dichroic prism are arranged in the direction of the projection lens, the horizontal width can be reduced.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an optical system showing an embodiment of a reflection type liquid crystal projector according to the present invention.

FIG. 2 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 3 is a band characteristic diagram illustrating characteristics of a PBS used in a reflection type liquid crystal projector according to the present invention.

FIG. 4 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 5 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 6 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 7 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 8 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 9 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 10 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 11 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 12 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 13 is a main part configuration diagram of an optical system showing another embodiment of the reflection type liquid crystal projector according to the present invention.

FIG. 14 is a configuration diagram of a main part of an optical system showing a conventional reflective liquid crystal projector.

[Explanation of symbols]

 Reference Signs List 1 light source 2 reflector 3gr first dichroic mirror 3r second dichroic mirror 3g third dichroic mirror 4 total reflection mirror 5b first PBS (narrow band PBS) 5b 'first' PBS (broadband PBS) 5g second 5g '2nd PBS (broadband PBS) 5g "3rd" PBS (narrowband PBS) 5r 3rd PBS (narrowband PBS) 5r' 3 'PBS ( Broadband PBS) 5r ″ Second ″ PBS (Narrowband PBS) 6b First reflective liquid crystal panel 6b ′ First ′ reflective liquid crystal panel 6g Second reflective liquid crystal panel 6g ′ Second ′ reflection -Type liquid crystal panel 6g '' Third '' reflective liquid crystal panel 6g '' 'Third' '' reflective liquid crystal panel 6r Third reflective liquid crystal panel 6r 'Third' reflective type Liquid crystal panel 6r '' 2nd '' reflection type liquid crystal panel 7 Cross dichroic prism 8 Projection lens 9 Absorption filter 10 1/2 phase plate 20 Screen

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI H04N 9/31 H04N 9/31 C

Claims (19)

[Claims] 1. A first dichroic mirror that transmits B-color light of light emitted from a light source and reflected by a reflector, reflects G-color light and R-color light, and separates the light into B-color light and (R + G) -color light. A first 'PBS (polarizing beam splitter) that reflects the split S-polarized light of B-color light and transmits P-polarized light, and S-polarized light of B-color light reflected by the first' PBS are input. Modulate with a video signal etc. and set the polarization plane to 90
A first reflective liquid crystal panel that emits P-polarized light after rotating by a degree, and receives the split (R + G) color light and receives the same (R +
G) The second 'PBS that reflects the S-polarized light of the color light and transmits the P-polarized light, and the second PBS that reflects the (R +)
G) a second reflective liquid crystal panel that receives S-polarized light of color light, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit P-polarized light of (R + G) color light; Modulated by the reflective liquid crystal panel and transmitted through the second PBS (R +
G) an absorption filter that absorbs the R-color light of the P-polarized light of the color light, and (R + G) that has been separated and transmitted through the second PBS.
Of the P-polarized light of color light, the P-polarized light of R
A second dichroic mirror that bends parallel to the color light;
A 3 ′ PBS that transmits P-polarized light of R-color light parallel to the B-color light and reflects S-polarized light, and a P-polarized light of R-color light that has passed through the 3 ′ PBS and enters the video signal 3 ′ that emits S-polarized light by rotating the polarization plane by 90 degrees while modulating by
A reflective liquid crystal panel, a cross dichroic prism for condensing each color light emitted through the first 'PBS, the second' PBS and the absorption filter and the third 'PBS, and a projection lens. A reflection type liquid crystal projector wherein light condensed by the cross dichroic prism is projected on a screen via a projection lens. 2. Instead of an absorption filter provided between the second 'PBS and the cross dichroic prism,
2. The reflection type liquid crystal projector according to claim 1, wherein a 1/2 phase difference plate is provided between the first PBS and the cross dichroic prism. 3. The light emitted from the light source and reflected by the reflector is split into three color lights of R (red), G (green), and B (blue) by the spectral means, and each color light is PBS (polarized beam splitter). Through the reflective liquid crystal panel corresponding to each color light, and the respective color light modulated and output by the video signal in the reflective liquid crystal panel enters the cross dichroic prism through each PBS, respectively, and In a reflection type liquid crystal projector that projects light condensed by a dichroic prism onto a screen via a projection lens, a narrow band PBS having a narrow band characteristic is used as the PBS, and the narrow band PBS converts the light into predetermined two-color light. A reflection type liquid crystal projector characterized in that light is split. 4. The reflection type liquid crystal projector according to claim 3, wherein the band characteristic of said narrow band PBS is a characteristic of reflecting S-polarized light of two color lights having continuous wavelengths such as G color light and B color light. 5. The reflection type according to claim 3, wherein a band characteristic of the narrow band PBS is a characteristic of reflecting S-polarized light of two color lights separated in wavelength, such as R color light and B color light. LCD projector. 6. The reflection type liquid crystal projector according to claim 3, wherein the band characteristic of said narrow band PBS is a characteristic that reflects only S-polarized light of one color light such as G color light. 7. A first dichroic mirror that transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the light into B color light and (R + G) color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by and modulates with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R + G)
A second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the G color light, and transmitting the P-polarized light and the R color light of the G color light, and the G color light reflected by the second PBS S-polarized light is incident and modulated by a video signal, etc.
A second reflection-type liquid crystal panel that emits P-polarized light by rotating by a degree, and a total reflection mirror that bends P-polarized light and R-color light of G color light transmitted through the second PBS in parallel with the B color light. ,
A 3 ′ PBS that reflects the S-polarized light of the R-color light parallel to the B-color light and transmits the P-polarized light of the G-color light and the R-color light, and the S-polarized light of the R-color light reflected by the 3 ′ PBS. And a third reflective liquid crystal panel that emits P-polarized light by rotating the plane of polarization by 90 degrees and modulating it with a video signal or the like, the first PBS, the second PBS, and the 3 ′ PBS. A cross dichroic prism for condensing each color light emitted through the lens, and a projection lens, and the light condensed by the cross dichroic prism is projected on a screen through the projection lens. 7. The reflection type liquid crystal projector according to claim 4 or claim 6. 8. The reflection type liquid crystal according to claim 3, wherein a fourth PBS for aligning a polarization plane in one direction is disposed in an optical path of light emitted from the light source and reflected by the reflector. projector. 9. A first dichroic mirror that transmits B-color light of light emitted from a light source and reflected by a reflector, reflects G-color light and R-color light, and splits the light into B-color light and (R + G) -color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by and modulates with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R + G)
A second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the G color light, and transmitting the P-polarized light and the R color light of the G color light, and the G color light reflected by the second PBS S-polarized light is incident and modulated by a video signal, etc.
A second reflection type liquid crystal panel that emits P-polarized light by rotating by a degree, and a second dichroic mirror that reflects R-color light out of the color light transmitted through the second PBS and makes it parallel to the B-color light. A third PBS that transmits the P-polarized light of the same R color and reflects the S-polarized light, and a P-polarized light of the R-color light transmitted through the third PBS, and modulates it with a video signal or the like. And a 3 ′ reflection type liquid crystal panel that emits S-polarized light by rotating the polarization plane by 90 degrees, and each color light emitted through the first PBS, the second PBS, and the 3 ′ PBS. It consists of a cross dichroic prism that condenses light and a projection lens,
7. The reflection type liquid crystal projector according to claim 4, wherein the light condensed by the cross dichroic prism is projected on a screen via a projection lens. 10. A first dichroic mirror that transmits B-color light of light emitted from a light source and reflected by a reflector, reflects G-color light and R-color light, and splits the light into B-color light and (R + G) -color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by S, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R +
G) The second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the G-color light, and transmitting the P-polarized light and the R-color light of the same G light, and reflected by the second PBS. A second reflective liquid crystal panel that receives S-polarized light of G color, modulates it with a video signal or the like, rotates the plane of polarization by 90 degrees, and emits P-polarized light, and the second reflective liquid crystal panel that transmits the second PBS. Among them, a second dichroic mirror that reflects R-color light to be parallel to the B-color light, a 3 ′ PBS that reflects S-polarized light of the R-color light and transmits P-polarized light, and a 3′-th PBS A 1/2 phase plate that shifts the P-polarized light of the R-color light transmitted through the PBS by 1/2 phase and converts it into S-polarized light, and receives the S-polarized light from the 1/2 phase plate to input video signals and the like. A third reflective liquid crystal panel that emits P-polarized light by rotating the polarization plane by 90 degrees and modulating the polarization by 90 degrees;
The first PBS, the second PBS and the third 'PBS
A cross dichroic prism for condensing each color light emitted through the lens, and a projection lens, and the light condensed by the cross dichroic prism is projected on a screen through the projection lens. 7. The reflection type liquid crystal projector according to claim 4 or claim 6. 11. A first dichroic mirror that transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the light into B color light and (R + G) color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first 'reflective liquid crystal panel that receives P-polarized light of B-color light that has passed through S, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit S-polarized light; R +
G) The second PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the G-color light, and transmitting the P-polarized light and the R-color light of the same G light, and reflected by the second PBS. A second reflective liquid crystal panel that receives S-polarized light of G color, modulates it with a video signal or the like, rotates the plane of polarization by 90 degrees, and emits P-polarized light, and the second reflective liquid crystal panel that transmits the second PBS. Among them, a second dichroic mirror that reflects R-color light to be parallel to the B-color light, a 3 ′ PBS that reflects S-polarized light of the R-color light and transmits P-polarized light, and a 3′-th PBS A 3 ′ reflective liquid crystal panel that receives P-polarized light of R-color light that has passed through the PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits S-polarized light; Cross dichroic for condensing each color light emitted through PBS, second PBS and third 'PBS 7. The reflection type liquid crystal projector according to claim 4, comprising a prism and a projection lens, wherein the light condensed by the cross dichroic prism is projected on a screen via the projection lens. . 12. A first dichroic mirror which transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the light into B color light and (R + G) color light. The first 'PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light and the P-polarized light of the B-color light that has passed through the first' PBS are shifted in phase by 位相 to form S. A 位相 -phase plate for converting into a polarized light, and a first す る -polarized light emitted from the １ ／ -phase plate, which receives the S-polarized light, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and outputs the P-polarized light. And a second liquid crystal panel having a narrow band characteristic of receiving the separated (R + G) color light, reflecting the S-polarized light of the G color light, and transmitting the P-polarized light and the R color light of the same G light. PBS
A second reflection type liquid crystal panel that receives the S-polarized light of G color light reflected by the second PBS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, The second
Of the color light transmitted through the PBS, the R color light is reflected and the B light is reflected.
A second dichroic mirror that is parallel to the color light;
A third 'PBS that reflects the S-polarized light of the color light and transmits the P-polarized light, and the P-polarized light of the R-color light transmitted through the third' PBS is shifted by 1/2 phase and converted to the S-polarized light. And a third reflection type liquid crystal that receives the S-polarized light from the same half-phase plate, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits the P-polarized light. A panel and the first 'P
A cross dichroic prism for condensing each color light emitted through the BS, the second PBS and the third 'PBS; and a projection lens, and the light condensed by the cross dichroic prism is transmitted through the projection lens. 7. The reflection type liquid crystal projector according to claim 4, wherein the light is projected on a screen. 13. The method according to claim 13, wherein the first 'PBS is replaced with the second PB.
13. The reflective liquid crystal according to claim 4, wherein the first PBS having the same narrow band characteristic as that of S is used. projector. 14. A method according to claim 1, wherein said first dichroic mirror is replaced with a total reflection mirror, and an absorption filter for absorbing G color light is provided between said total reflection mirror and said third PBS. Claim 7, Claim 9, Claim 1
13. The reflection type liquid crystal projector according to claim 11. 15. A first dichroic mirror which transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the same into B light and (R + G) light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by S, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R +
G) a second ″ PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the R color light, and transmitting the P-polarized light and the G color light of the R color light, and the second ″ PBS. A second ″ reflection type liquid crystal panel that receives the S-polarized light of R-color light reflected by the PBS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; R transmitted through PBS
A total reflection mirror that bends P-polarized light and G-color light of color light in parallel with the B-color light, reflects S-polarized light of G-color light parallel to the B-color light, and transmits P-polarized light of R-color light and G-color light And the G reflected by the third "PBS
A 3 ″ reflective liquid crystal panel that receives S-polarized light of color light, modulates it with a video signal or the like, rotates the plane of polarization by 90 °, and emits P-polarized light, the first PBS, the second PBS, 'PB
A cross dichroic prism for condensing each color light emitted through the S and the 3 ″ PBS, and a projection lens, and the light condensed by the cross dichroic prism is projected onto a screen via the projection lens 6. The reflection type liquid crystal projector according to claim 5, wherein 16. A first dichroic mirror that transmits B-color light of light emitted from a light source and reflected by a reflector, reflects G-color light and R-color light, and splits the light into the B-color light and (R + G) -color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by S, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R +
G) a second ″ PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the R color light, and transmitting the P-polarized light and the G color light of the R color light, and the second ″ PBS. A second reflective liquid crystal panel that receives the S-polarized light of R-color light reflected by the PBS, modulates the image with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; A third dichroic mirror that reflects the G color light out of the color light transmitted through the PBS and makes it parallel to the B color light, and reflects the S polarized light of the same G color light;
The third ″ PBS that transmits the P-polarized light and the P-polarized light of the G color light that has passed through the third ″ PBS enter and modulate with a video signal and the like, and rotate the polarization plane by 90 degrees to rotate S. A third '' reflective liquid crystal panel that emits polarized light, and the first PB
S, a cross dichroic prism for condensing each color light emitted through the second "PBS and the third" PBS, and a projection lens, and the light condensed by the cross dichroic prism is a projection lens 6. The reflection type liquid crystal projector according to claim 5, wherein the projection is performed on a screen via a screen. 17. A first dichroic mirror that transmits B-color light of light emitted from a light source and reflected by a reflector, reflects G-color light and R-color light, and separates the light into B-color light and (R + G) -color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first reflection type liquid crystal panel that receives S-polarized light of B-color light reflected by S, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the separated (R +
G) a second ″ PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the R color light, and transmitting the P-polarized light and the G color light of the R color light, and the second ″ PBS. A second ″ reflection type liquid crystal panel that receives the S-polarized light of R-color light reflected by the PBS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; 'Of the color light transmitted through the PBS, is reflected by the G color light to be parallel to the B color light.
'', The third ″ PBS that reflects the S-polarized light of the same G color light and transmits the P-polarized light, and the P-polarized light of the R color light transmitted through the third ″ PBS is を. A 1/2 phase plate that converts the phase to S-polarized light,
A 3 ″ reflective liquid crystal panel that receives the S-polarized light from the / 2 phase plate, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light, and the first PBS. A cross dichroic prism for condensing each color light emitted through the second '' PBS and the third '' PBS, and a projection lens, and the projection lens for the light condensed by the cross dichroic prism. 6. The reflection type liquid crystal projector according to claim 5, wherein the projection is performed on a screen via a screen. 18. A first dichroic mirror which transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the light into B color light and (R + G) color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A first 'reflection type liquid crystal panel that receives P-polarized light of B-color light transmitted through S, modulates it with a video signal or the like, and rotates the polarization plane by 90 degrees to emit S-polarized light; R +
G) a second ″ PBS having a narrow band characteristic of receiving the color light, reflecting the S-polarized light of the R color light, and transmitting the P-polarized light and the G color light of the R color light, and the second ″ PBS. A second ″ reflection type liquid crystal panel that receives the S-polarized light of R-color light reflected by the PBS, modulates it with a video signal or the like, rotates the polarization plane by 90 degrees, and emits P-polarized light; 'Of the color light transmitted through the PBS, is reflected by the G color light to be parallel to the B color light.
Dichroic mirror, the third "PBS that reflects the S-polarized light of the same G color light and transmits the P-polarized light, and the P-polarized light of the G color light transmitted through the third" PBS. A 3 'reflective liquid crystal panel that emits S-polarized light by modulating with a video signal and rotating the plane of polarization by 90 degrees;
A cross dichroic prism for condensing each color light emitted through the PBS, the second "PBS and the third" PBS, and a projection lens, and the light condensed by the cross dichroic prism is projected. 6. The reflection type liquid crystal projector according to claim 5, wherein the projection is performed on a screen via a lens. 19. A first dichroic mirror that transmits B color light of light emitted from a light source and reflected by a reflector, reflects G color light and R color light, and separates the light into B color light and (R + G) color light. A first PBS that reflects the S-polarized light of the split B-color light and transmits the P-polarized light;
A 位相 phase plate that shifts the P-polarized light of the B color light transmitted through S by 位相 phase and converts it into S-polarized light, and receives the S-polarized light from the 位相 phase plate and receives an image signal or the like. A first reflective liquid crystal panel that emits P-polarized light by modulating and rotating the polarization plane by 90 degrees, and that receives the split (R + G) color light;
A second ″ PBS having a narrow band characteristic of reflecting the S-polarized light of the R-color light and transmitting the P-polarized light and the G-color light of the R-color light
A 2 ″ reflection type in which the S-polarized light of R-color light reflected by the second ″ PBS enters, is modulated by a video signal or the like, and rotates the polarization plane by 90 ° to emit P-polarized light. A liquid crystal panel, a third dichroic mirror that reflects the G color light out of the color light transmitted through the second ″ PBS and makes it parallel to the B color light, and reflects the S-polarized light of the G color light; A third ″ PBS that transmits polarized light, and a 位相 phase plate that converts P-polarized light of G color light transmitted through the third ″ PBS by 位相 phase and converts it into S-polarized light; The S-polarized light from the half-phase plate enters and is modulated by a video signal and the like, and the polarization plane is set to 90.
A third liquid crystal panel that emits P-polarized light by rotating the liquid crystal panel, and collects each color light emitted through the first PBS, the second PBS, and the third PBS. It consists of a light emitting cross dichroic prism and a projection lens,
6. The reflection type liquid crystal projector according to claim 5, wherein the light condensed by said cross dichroic prism is projected on a screen via a projection lens.