JP2002268138A - Projection type display device and optical block for removing unnecessary light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove light of unnecessary wavelength from the illumination light emitted by a lamp of a projection type display device. SOLUTION: The light emitted by a light source 101 is converted by a single polarization converting device 102. The converted P polarized light is made incident on a wavelength selective phase plate 201. The wavelength selective phase plate 201 converts G-color light of the P polarized light into S polarized light. The S polarized light includes light of 580 nm in wavelength. The G-color light including the wavelength of 580 nm is made incident on a wavelength selective phase plate 204 through a polarization beam splitter 103, a polarization beam splitter 105, a 1/2-wavelength plate 301, and a polarization beam splitter 106. The wavelength selective phase plate 204 converts the incident G-color light (S polarized light) into P polarized light. The P polarized light does not include light of 580 nm in wavelength. A polarizing film 401 transmits the P polarized light of the light emitted from the wavelength selective phase plate 204 and absorbs the S polarized light. Consequently, the unnecessary light of 580 nm in wavelength included in the G-color light is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projection display device and an optical block for removing unnecessary light.

[0002]

2. Description of the Related Art A projection display device using a reflection type light valve is known. In this projection display device, light from a light source is color-separated into light of a plurality of colors, and light emitted from a polarizing beam splitter is incident directly or via a prism on a light valve provided for each color. The modulated light of each color reflected and emitted by the light valve travels in the direction opposite to the incident light, is color-synthesized, guided again to the polarizing beam splitter, and projected by a projection lens toward a screen or the like.

[0003]

The light source of the above-mentioned projection type display device includes, for example,
High pressure mercury lamps are used. Generally, the emission spectrum of a high-pressure mercury lamp has a strong peak component around a wavelength of 580 nm. R (red), G
In the case of color separation into three primary colors (green) and B (blue), the wavelength is 580n
The component of m corresponds between the G light and the R light. As described above, the peak where the light source light is unnecessary in the wavelength region between the three primary colors to be separated is described.
In the case of having a color component, the color purity of each of the three primary colors is degraded, and the color quality of the projected image is degraded.

An object of the present invention is to provide a projection display device for removing light in an unnecessary wavelength region and an optical block for removing unnecessary light.

[0005]

The present invention will be described with reference to FIGS. 1 and 6 showing one embodiment. (1) The projection type display device according to the first aspect of the present invention,
A light source 101 for supplying illumination light, light from the light source 101 incident thereon, polarization separating optical systems 105 and 104 for separating incident light into a specific polarized light component and emitting the polarized light, and polarization separating optics based on an image signal. Light valves 107G and 107 for modulating and emitting light polarized and separated by the systems 105 and 104
R (107B) and the light valves 107G and 107R (1
07B), the first light detection optical systems 105, 301, 104, and 20 detect and emit light having a specific polarization component.
3, 106, and the first detection optical system 105, 301, 10
A first wavelength-selective phase plate 204 that receives light from the light sources 4, 203, and 106 and changes the oscillation direction of light in one of a necessary wavelength region and an unnecessary wavelength region and emits the light. The light emitted from the neutral phase plate 204 is analyzed,
Second analysis optical system 401 that cuts light in an unnecessary wavelength range
The above-described object is achieved by having the projection optical system 108 for projecting light in a required wavelength region emitted from the second analysis optical system 401. (2) According to a second aspect of the present invention, in the projection type display device according to the first aspect, the polarization beam splitter 10 has a function of the polarization separation optical system and a function of the first analysis optical system.
5,104. (3) The invention according to claim 3 is the projection display device according to claim 1, wherein the light valve modulates the second color light with the first light valve 107G that modulates and emits the first color light. Light valve 107R (107B) for injection
The first analyzing optical system includes a first light valve 107.
First color detection optical system 1 for detecting the first color light emitted from G
05, and a second color analysis optical system 104 for analyzing the second color light emitted from the second light valve 107R (107B), and converts the light from the light source 101 into a first color light and a second color light. The color separation optical systems 102, 201, and 103 for separation, the first color analysis optical system 105 side, and the second color analysis optical system 104.
Polarized light beams having vibration directions orthogonal to each other are received on different surfaces from the side, and the first color analysis optical system 105 is received.
The polarization beam splitter further includes a polarization beam splitter for color-combining light incident from the side and light incident from the second color analysis optical system 104 side. (4) The invention according to claim 4 is the projection type display device according to claim 1, wherein the color separation optical systems 102 and 201 for separating light from the light source 101 into first color light and second color light.
A, 103, wherein the light valve comprises a first light valve 107G for modulating and emitting the first color light, and a second light valve 107R (10 for modulating and emitting the second color light).
7B), the first analysis optical systems 105 and 104 respectively emit the first color light and the second color light, which are polarized lights in the vibration direction of the light that is directly incident on each other, as the analysis light, and perform the first wavelength selection. The neutral phase plate 203 is disposed in one of the optical paths through which the first color light detection light and the second color light detection light pass,
The second analyzing optical system includes a polarizing beam splitter 106A which also serves as a color combining optical system for combining the analyzing light of the first color light and the analyzing light of the second color light. (5) The invention according to claim 5 is the projection display device according to claim 1, wherein the light valve modulates the first color light and the first light valve 107G, and modulates the second color light. Light valve 107R (107B) for injection
The polarization separation optical system includes a color separation optical system that separates the light from the light source 101 into first color light and second color light including light in an unnecessary wavelength region, and the color separation optical system includes a light source 101
And a polarization conversion device 102 that receives light from the light source and emits polarized light in a specific vibration direction. The light emitted from the two-wavelength selective phase plate 201 and the second wavelength-selective phase plate 201 enters, and the first color light and the second
Polarization beam splitter 103 that separates and emits color light
The first wavelength-selective phase plate 204 is characterized in that, of the first color light, one of the vibration directions of light in a necessary wavelength region and light in an unnecessary wavelength region is converted. (6) The invention according to claim 6 is the projection type display device according to claim 1, wherein the light source is a metal halide lamp,
Alternatively, it is a high-pressure mercury lamp, and a wavelength range of unnecessary light is around 580 nm. (7) The optical block for removing unnecessary light according to the seventh aspect of the present invention receives light from the light source 101, and separates the incident light into a specific polarization component by polarization.
Polarization separation optical systems 105 and 10 for emitting to 7R (107B)
4 and light modulated by the light valves 107G and 107R (107B) are incident thereon, and the first light analysis optical systems 105, 301, and 10 detect the incident light into specific polarization components and emit the same.
4, 203, 106, and the first analysis optical systems 105, 30
Wavelength-selective phase plate 204 that receives light emitted from 1, 104, 203, and 106 and changes the oscillation direction of light in one of a necessary wavelength region and an unnecessary wavelength region and emits the light.
And a second detection optical system 4 for detecting light emitted from the wavelength-selective phase plate 204 and cutting light in unnecessary wavelength regions.
By having 01, the above-described object is achieved.

In the section of the means for solving the above-mentioned problems, the present invention is associated with the drawings of the embodiments in order to explain the present invention in an easy-to-understand manner, but the present invention is not limited to the embodiments. is not.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. -First Embodiment- FIG. 1 is a basic configuration diagram of a projection display according to a first embodiment of the present invention. In FIG. 1, the projection display device includes a light source 101, a single polarization conversion device 102, a wavelength-selective phase plate 201, a polarization beam splitter 103,
A polarizing beam splitter 104, a polarizing beam splitter 105, a polarizing beam splitter 106, a wavelength-selective phase plate 202, a wavelength-selective phase plate 203, a half-wave phase plate 301, and a wavelength-selective phase plate 204; , B light reflective light valve 107B, R light reflective light valve 107R, and G light reflective light valve 107G
, A polarizing film 401, and a projection lens 108.

The light source 101 includes a high-pressure mercury lamp 101a and a parabolic concave mirror 101b. The light source light beam emitted from the light source 101 is converted into substantially single polarized light (P-polarized light) by the single polarization converter 102. The single polarization conversion device 102 includes a fly-eye integrator, a polarization beam splitter array, a half-wave phase plate, and a condenser lens. The fly-eye integrator includes a first lens plate in which a plurality of lenses are arranged in a plane, and a similar second lens plate. The polarization beam splitter array has a plurality of polarization beam splitters formed in an array, and is arranged on the exit surface of a fly-eye integrator. The half-wavelength phase plate is arranged on the exit surface of the polarization beam splitter array of the predetermined polarization beam. The condenser lens condenses the single polarized light emitted from the polarizing beam splitter array and the half-wavelength phase plate. With these configurations, the light source light from the light source 101 is converted into single polarized light (P polarized light in this embodiment).

FIG. 2 shows an example of an emission spectrum of the high-pressure mercury lamp 101a. In FIG. 2, the horizontal axis represents the emission wavelength. The vertical axis represents the light emission intensity. In general,
The shorter wavelength side of the visible light region than the wavelength of 500 nm is classified as B color light. G from wavelength 500nm to wavelength 600nm
Classified as colored light. The longer wavelength side than the wavelength of 600 nm is classified as R color light. Here, the peak spectrum P having a wavelength of 580 nm located near the boundary between the G color light region and the R color light region is a factor for deteriorating the color purity (especially, G color) of the three primary colors. According to the present invention, a component having a wavelength of 580 nm is cut off from projection light as unnecessary light.

The single polarized light emitted from the single polarized light converter 102 is incident on the wavelength selective phase plate 201. The wavelength-selective phase plate 201 converts only the component in the G color light wavelength region out of the incident P-polarized light into S-polarized light having a different vibration direction and emits it. The components in the R color light wavelength region and the B color light wavelength region are P Emitted with polarized light. Here, a wavelength-selective phase plate 201 and wavelength-selective phase plates 202 and 2 described later are used.
Numerals 03 and 204 have a function of converting only a specific wavelength range of incident single polarized light into polarized light having a vibration direction different from that of incident polarized light and emitting the polarized light. These wavelength-selective phase plates are optical films made of a multilayer polymer,
For example, it is disclosed in Japanese Patent Publication No. 9-506837.

FIG. 3A is a diagram showing the wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 201. In FIG. 3A, the horizontal axis represents wavelength. The vertical axis is P polarized light → S polarized light,
And the conversion rate from S-polarized light to P-polarized light. The wavelength-selective phase plate 201 according to the first embodiment has a wavelength of 580 nm.
A nearby spectral component (indicated by a mark in the drawing) is included in the G color light wavelength region, and is converted from P-polarized light to S-polarized light together with the G color light. FIG. 4A is a diagram illustrating light incident on the wavelength-selective phase plate 201. FIG. 4B shows a wavelength-selective phase plate 2.
It is a figure showing the emitted light of No. 01. In each drawing of FIG. 4, the horizontal axis represents wavelength, and the vertical axis represents light intensity. The P-polarized light is represented by a solid line, and the S-polarized light is represented by a broken line.

In FIG. 1, light emitted from a wavelength-selective phase plate 201 enters a polarizing beam splitter 103. The polarization beam splitter 103 has a polarization separation unit, and separates incident light into S-polarized light reflected by the polarization separation unit and P-polarized light transmitted through the polarization separation unit. Thereby, the light incident on the polarization beam splitter 103 is
It is color-separated into mixed light of P-polarized R and B light and G-colored light of S-polarized light. FIG. 4C is a diagram illustrating light transmitted through the polarization beam splitter 103. FIG. 4 (d)
FIG. 4 is a diagram showing reflected light from the polarization beam splitter 103. The color-separated G color light is incident on the adjacent polarization beam splitter 105, and the polarization beam splitter 10
The light is reflected and emitted by the polarization separation unit 5. The G color light emitted from the polarizing beam splitter 105 is incident as illumination light on a G color light reflection type light valve 107G disposed near the exit surface. Thus, the single polarization converter 1
02, the wavelength-selective phase plate 201, and the polarization beam splitter 103 constitute a color separation optical system.

The mixed light of the R-color light and the B-color light transmitted and emitted from the polarization beam splitter 103 is incident on a wavelength-selective phase plate 202 arranged near the exit surface of the polarization beam splitter 103. FIG. 3B is a diagram illustrating a wavelength-polarization conversion rate characteristic of the wavelength-selective phase plate 202. The wavelength-selective phase plate 202 converts only the component of the B-color light wavelength region of the incident P-polarized light into S-polarized light having a different vibration direction and emits it, and emits the component of the R-color light wavelength region as P-polarized light. . FIG. 4E is a diagram illustrating light emitted from the wavelength-selective phase plate 202. Light emitted from the wavelength-selective phase plate 202 is incident on the polarization beam splitter 104. The light incident on the polarization beam splitter 104 is color-separated into P-polarized R light transmitted through the polarization splitter and S-polarized B light reflected from the polarization splitter. Color-separated R color light and B
The color lights are respectively emitted from different emission surfaces of the polarization beam splitter 104, and are respectively incident on the reflection type light valves 107R and 107B arranged near the emission surface as illumination light.

Here, the reflection type light valve 107R, 1
07G and 107B will be described. The reflection type light valve is an electric writing type reflection type light valve.
That is, a non-linear switching element such as a TFT is provided on a silicon substrate so as to correspond to each of a plurality of pixels, and a voltage is selectively applied to a liquid crystal layer constituting the pixels of the TFT according to an image signal. . In the liquid crystal layer to which a voltage is applied, the arrangement of liquid crystal molecules is changed, and the liquid crystal layer functions as a phase plate. Therefore, the polarized light incident on the reflection type light valve is guided to the reflection layer via the liquid crystal layer, reflected by the reflection layer and emitted from the reflection type light valve, so that the incident polarization direction and the vibration direction are different. Polarized light is emitted as modulated light. On the other hand, the portion of the reflective light valve corresponding to the unselected pixel, that is, the polarized light incident on the TFT to which no voltage is applied proceeds according to the twisted structure of the initial alignment of the liquid crystal molecules and is reflected by the reflective layer. . The reflected light travels again in reverse according to the twisted structure, and is emitted as polarized light having the same vibration direction as the incident polarized light.

The B-color light reflected and emitted from the B-color light valve 107B is incident on the polarization beam splitter 104 again. The solid line in FIG. 4F indicates the modulated light emitted from the B-color light valve 107B corresponding to the selected pixel.
It is a figure showing (P polarization). Actually, unmodulated light (S-polarized light) corresponding to the unselected pixel is also included in the B color light region. The polarization beam splitter 104 separates (analyzes) the incident B-color light into P-polarized modulated light transmitted through the polarization splitter and S-polarized non-modulated light reflected from the polarization splitter. The unmodulated light reflected by the polarizing beam splitter 104 is the light source 1
It proceeds in the 01 direction and is discarded.

Similarly, the R-color light reflected and emitted from the R-color light valve 107R is incident on the polarization beam splitter 104 again. The broken line in FIG. 4 (f) is a diagram illustrating modulated light (S-polarized light) emitted from the R-color light valve 107R corresponding to the selected pixel. Actually, unmodulated light (P-polarized light) corresponding to the unselected pixel is also included in the R color light region. The polarization beam splitter 104 separates (analyzes) the incident R-color light into S-polarized modulated light that reflects the polarization separation unit and P-polarized non-modulated light that passes through the polarization separation unit. The unmodulated light transmitted through the polarization beam splitter 104 proceeds toward the light source 101 and is discarded.

The polarization beam splitter 104 performs color synthesis of modulated light (analytical light) of R color light and B color light. The R and B light beams emitted from the polarization beam splitter 104 are incident on a wavelength-selective phase plate 203 disposed near the exit surface of the polarization beam splitter 104. FIG.
(c) is a diagram showing the wavelength-polarization conversion rate characteristics of the wavelength selective phase plate 203. The wavelength-selective phase plate 203 converts only the component in the R-color light wavelength region of the incident S-polarized light into P-polarized light having a different vibration direction and emits it, and emits the component in the B-color light wavelength region as P-polarized light. . FIG. 4H is a diagram illustrating light emitted from the wavelength-selective phase plate 203. The light emitted from the wavelength-selective phase plate 203 is transmitted to the polarization beam splitter 1.
06.

On the other hand, the G color light reflected and emitted from the G color light valve 107G is incident on the polarization beam splitter 105 again. The solid line portion in FIG. 4G is a diagram illustrating the modulated light (P-polarized light) emitted from the G-color light valve 107G corresponding to the selected pixel. Actually, unmodulated light (S-polarized light) corresponding to the unselected pixel is also included in the G color light region. The polarization beam splitter 105 separates (analyzes) the incident G color light into P-polarized modulated light that passes through the polarization splitter and S-polarized non-modulated light that reflects the polarization splitter. The unmodulated light reflected by the polarization beam splitter 105 travels toward the light source 101 and is discarded.

The detection light of the G color light emitted from the polarization beam splitter 105 is incident on a half-wave phase plate 301 disposed near the exit surface of the polarization beam splitter 105. The half-wave phase plate 301 converts the incident P-polarized light into S-polarized light having a different vibration direction and emits the converted P-polarized light. FIG. 4 (i)
FIG. 4 is a diagram illustrating light emitted from a half-wavelength phase plate 301.
The light emitted from the half-wave phase plate 301 enters the polarization beam splitter 106.

The polarization beam splitter 106 modulates B-color light and R-color light (P-polarized light) incident from the upper side in FIG.
, And is a modulated light of G color light incident from the right side of FIG.
The (S-polarized light) is reflected by the polarization splitting unit and emitted downward in FIG. That is, the polarization beam splitter 106 performs color synthesis of the B-color light and the R-color light and the G-color light. FIG. 4 (j) is a diagram illustrating light emitted from the polarization beam splitter 106. A wavelength-selective phase plate 204 is provided near the exit surface of the polarization beam splitter 106. FIG.
(d) is a diagram illustrating the wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 204. The wavelength-selective phase plate 204 converts only the component of the G light wavelength region of the incident light into polarized light having a different vibration direction and emits it. FIG. 4 (k) is a diagram illustrating light emitted from the wavelength-selective phase plate 204. Here, the wavelength-selective phase plate 204, unlike the above-described wavelength-selective phase plate 201, does not include a spectral component near a wavelength of 580 nm in the G color light wavelength region. That is, the wavelength-selective phase plate 204 has a G component on the shorter wavelength side than the spectral component near the wavelength of 580 nm.
The color light is converted from S-polarized light to P-polarized light.
The nearby spectral components are emitted as S-polarized light.

A polarizing film 401 is provided near the wavelength-selective phase plate 204. The polarizing film 401 is
P-polarized light of the incident light is transmitted and emitted, and S-polarized light is absorbed.
FIG. 4 (l) is a diagram illustrating light emitted from the polarizing film 401. FIG. When the color-combined light emitted from the wavelength-selective phase plate 204 is incident on the polarizing film 401, the modulated light of R-color light, B-color light, and G-color light (excluding wavelengths around 580 nm), which are P-polarized light, is projected. 108.
Thereby, a full-color image is projected on a screen (not shown). The spectral component around the wavelength of 580 nm is S
Since the light is polarized, it is absorbed by the polarizing film 401 and is not projected on the screen. That is, the peak component having a wavelength of 580 nm is removed as unnecessary light.

FIG. 5 shows the wavelength selective phase plate 20 described above.
FIG. 2 is a diagram illustrating a specific example of a wavelength-polarization conversion rate characteristic of the wavelength-selective phase plate 204. In FIG. 5, the wavelength region where the wavelength-selective phase plate 201 performs polarization conversion is a region including unnecessary light, that is, a region including a peak spectrum with a wavelength of 580 nm. The wavelength region in which the wavelength-selective phase plate 204 performs polarization conversion exists in the wavelength region of the wavelength-selective phase plate 201 and does not include an unnecessary wavelength of 580 nm. As described above, a difference is provided in a wavelength region where a plurality of wavelength-selective phase plates performs polarization conversion, and an unnecessary wavelength is included in the difference.

According to the first embodiment described above,
The light emitted from the light source 101 is a single polarization converter 10
2 converts the light into P-polarized light. The converted P-polarized light is incident on the wavelength-selective phase plate 201. The wavelength-selective phase plate 201 converts G-color light of the P-polarized light into S-polarized light. The S-polarized light includes light having a wavelength of 580 nm.
The G color light including the wavelength of 580 nm is polarized beam splitter 103 → polarization beam splitter 105 → G color light light valve 107G → polarization beam splitter 105 → 1/2.
The wavelength-selective phase plate 204 enters the wavelength-selective phase plate 204 as S-polarized light via the wavelength phase plate 301 → polarization beam splitter 106. The wavelength-selective phase plate 204 converts incident G-color light, that is, S-polarized light, to P-polarized light. This P-polarized light does not include light having a wavelength of 580 nm. The polarizing film 401 is
The light transmitted from the wavelength-selective phase plate 204 transmits P-polarized light and absorbs S-polarized light. As a result, the wavelength region of 580 nm included in the G color light, that is, unnecessary light is cut.

-Second Embodiment- FIG. 6 is a basic configuration diagram of a projection display according to a second embodiment of the present invention. In FIG. 6, the same components as those in FIG. 1 in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The single polarized light emitted from the single polarization converter 102 enters the wavelength-selective phase plate 201A. The wavelength-selective phase plate 201A transmits only components in the G-color light wavelength region of the incident P-polarized light to S
The light is converted into polarized light and emitted, and the components in the R color light wavelength region and the B color light wavelength region are emitted as P-polarized light. FIG. 7 is a diagram showing wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 201A. Wavelength-selective phase plate 20 according to second embodiment
1A is a spectrum component around a wavelength of 580 nm (in the figure,
(Indicated by ☆) are not included in the G color light wavelength region. That is,
A peak spectrum having a wavelength of 580 nm is emitted from the wavelength-selective phase plate 201A as P-polarized light.

FIG. 8A is a diagram showing light incident on the wavelength-selective phase plate 201A. FIG. 8B is a diagram illustrating light emitted from the wavelength-selective phase plate 201A. Here, a spectral component around a wavelength of 580 nm (indicated by a star in the figure)
Are included in the R light wavelength region. In each drawing of FIG. 8, the horizontal axis represents wavelength, and the vertical axis represents light intensity. P-polarized light is represented by a solid line, and S-polarized light is represented by a broken line.

The light emitted from the wavelength-selective phase plate 201A is incident on the polarization beam splitter 103 and is separated into colors. The polarization beam splitter 103 is the same as that used in the first embodiment. FIG. 8C is a diagram illustrating light transmitted through the polarization beam splitter 103. FIG. 8D is a diagram illustrating reflected light from the polarization beam splitter 103. The G color light reflected and emitted by the polarization beam splitter 103 is incident on an adjacent polarization beam splitter 105. Polarizing beam splitter 105
Are the same as those used in the first embodiment.
The G-color light is reflected and emitted by the polarization splitting unit of the polarization beam splitter 105, and is incident on the G-color light reflective light valve 107G as illumination light. Thus, the single polarization converter 102 and the wavelength-selective phase plate 201
A and the polarization beam splitter 103 constitute a color separation optical system.

The mixed light of the R-color light and the B-color light transmitted and emitted by the polarizing beam splitter 103 is incident on a wavelength-selective phase plate 202. Wavelength selective phase plate 202
Are the same as those used in the first embodiment.
FIG. 8E is a diagram illustrating light emitted from the wavelength-selective phase plate 202. Light emitted from the wavelength-selective phase plate 202 is
The light enters the polarization beam splitter 104. The polarization beam splitter 104 is the same as that used in the first embodiment. The R color light and the B color light that have been color-separated by the polarization beam splitter 104 are respectively emitted from different exit surfaces of the polarization beam splitter 104, and are respectively incident on the reflection type light valves 107R and 107B as illumination light.

The B-color light reflected and emitted from the B-color light valve 107B is incident on the polarization beam splitter 104 again. The solid line in FIG. 8F indicates the modulated light emitted from the B-color light valve 107B corresponding to the selected pixel.
It is a figure showing (P polarization). Actually, unmodulated light (S-polarized light) corresponding to the unselected pixel is also included in the B color light region. on the other hand,
The R-color light reflected and emitted from the R-color light valve 107R is incident on the polarization beam splitter 104 again.
8F is a diagram illustrating modulated light (S-polarized light) emitted from the R-color light light valve 107R corresponding to the selected pixel. In fact, the unmodulated light corresponding to the unselected pixels
(P polarized light) is also included in the R color light region.

The polarization beam splitter 104 detects the modulated light of the R color light and the B color light and makes it incident on the wavelength-selective phase plate 203 as in the first embodiment. The wavelength-selective phase plate 203 is the same as that used in the first embodiment, and performs color synthesis of modulated light (analyzed light) of R-color light and B-color light. FIG. 8H is a diagram illustrating light emitted from the wavelength-selective phase plate 203. Here, a spectral component near the wavelength of 580 nm (indicated by a mark in the figure) remains S-polarized light. The light emitted from the wavelength-selective phase plate 203 is incident on the polarization beam splitter 106A. The polarization beam splitter 106A is the same as the polarization beam splitter 106 used in the first embodiment. However, in the second embodiment, the polarization beam splitter 1
06A reflects and removes the S-polarized spectral component around the wavelength of 580 nm. That is, the polarization beam splitter 1
06A constitutes an analysis optical system.

The G-color light reflected and emitted from the G-color light valve 107G is again reflected by the polarization beam splitter 105.
Is incident on. The solid line portion in FIG. 8G is a diagram illustrating the modulated light (P-polarized light) emitted from the G color light light valve 107G corresponding to the selected pixel. Actually, unmodulated light (S-polarized light) corresponding to the unselected pixel is also included in the G color light region. As in the first embodiment, the polarization beam splitter 105 detects the modulated light of G color light, and
Incident on The half-wave phase plate 301 is the same as that used in the first embodiment. FIG. 8 (i)
FIG. 4 is a diagram illustrating light emitted from a half-wavelength phase plate 301. 1/2
The light emitted from the wavelength phase plate 301 enters the polarization beam splitter 106A.

FIG. 8 (j) shows the polarization beam splitter 106.
FIG. 4 is a diagram illustrating emission light of A. Polarizing beam splitter 10
6A synthesizes the modulated light of B color light and R color light (analyzed light) and the modulated light of G color light (analyzed light). Here, as described above, the spectral components around the wavelength of 580 nm have been removed. As in the first embodiment, the polarization beam splitter 106A causes the modulated light of each color subjected to color synthesis to enter the wavelength-selective phase plate 204. Wavelength selective phase plate 204
Are the same as those used in the first embodiment.
FIG. 8 (k) is a diagram illustrating light emitted from the wavelength-selective phase plate 204. Modulated light of R-color light, B-color light, and G-color light that is P-polarized light is incident on the projection lens 108. This allows
A full-color image is projected on a screen (not shown).

According to the second embodiment described above,
The light emitted from the light source 101 is a single polarization converter 10
2 converts the light into P-polarized light. The converted P-polarized light is incident on the wavelength-selective phase plate 201A. The wavelength-selective phase plate 201A is provided with the R-color light and the B-
Color light is transmitted as P-polarized light. This P-polarized light has a wavelength of 5
Include 80 nm light. The R-color light having a wavelength of 580 nm is converted from the polarization beam splitter 103 to the wavelength-selective phase plate 2.
02 → polarization beam splitter 104 → reflection type light valve 107R for R color light → polarization beam splitter 104, and is incident on wavelength-selective phase plate 203 as S-polarized light. On the other hand, the B-color light is polarized beam splitter 103 → wavelength-selective phase plate 202 → polarization beam splitter 104 → B
The light enters the wavelength-selective phase plate 203 as P-polarized light through the reflective light valve 107 </ b> B for colored light → the polarization beam splitter 104. The wavelength-selective phase plate 203 converts incident R-color light, that is, S-polarized light into P-polarized light, and transmits incident B-color light as P-polarized light. For this P-polarized light,
Does not include light with a wavelength of 580 nm. The polarization beam splitter 106A transmits P-polarized light and reflects S-polarized light in the light emitted from the wavelength-selective phase plate 203. As a result, the wavelength region of 580 nm included in the R color light, that is, unnecessary light is cut.

Third Embodiment FIG. 9 is a diagram showing a basic configuration of a projection display apparatus according to a third embodiment of the present invention. In FIG. 9, the projection display device includes a light source 101, a polarizing beam splitter 501, a first prism 502, a second prism 503, a third prism 504, and a reflection light valve 107B for B color light.
, A reflective light valve 107R for R color light, a reflective light valve 107G for G color light, and a wavelength-selective phase plate 20.
5, the polarizing film 402, and the projection lens 108.

The light source 101, the polarization converter 102, and the light valves 107G, 107R, 107B for each color
Since the configuration is the same as the configuration according to the first embodiment, the same reference numerals are given and the description is omitted. In FIG. 9, the single polarized light emitted from the single polarization converter 102 enters the polarization beam splitter 501. The polarization beam splitter 501 has a polarization separation unit, and separates the polarized light into S-polarized light reflected by the polarization separation unit and P-polarized light transmitted through the polarization separation unit. The S-polarized light is discarded as unnecessary light.

The P-polarized light transmitted and emitted from the polarizing beam splitter 501 enters from the surface 502 a of the first prism 502. Light incident from the surface 502 a of the prism 502 travels through the first prism 502 as it is, and
The B color light is reflected by the dichroic film formed in 2b, and the R color light and the G color light are transmitted. Surface 502b
The dichroic film formed as described above has a characteristic of reflecting B-color light and transmitting R-color light and G-color light. Face 5
The B-color light reflected by the dichroic film 02b travels in the first prism 502 and undergoes total reflection on the surface 502a of the first prism 502. The B-color light totally reflected further travels inside the first prism 502 and is emitted from the surface 502c of the first prism 502. On the other hand, the R color light and the G color light that have passed through the dichroic film on the surface 502 b of the first prism 502 and exited from the first prism 502 are incident on the second prism 503 from the surface 503 a.

First prism 502 and second prism 503
Is fixedly integrated with a gap. The second prism 503 and the third prism 504 are connected to the second prism 5
03 and the surface 504a of the third prism 504 are bonded and integrated with a dichroic film therebetween. The dichroic film between the second prism 503 and the third prism 504 has a property of reflecting R-color light and transmitting G-color light. Here, the peak spectrum component having a wavelength of 580 nm is treated as R color light.

The mixed light of the R color light and the G color light incident on the second prism 503 from the surface 503 a is
The R color light is reflected by the dichroic film formed on the surface 503b, and the G color light is transmitted.
The reflected R color light travels inside the second prism 503 and undergoes total reflection on the surface 503a of the second prism 503. The totally reflected R color light travels inside the second prism 503 and is emitted from the surface 503c of the second prism 503.
On the other hand, the G color light transmitted through the dichroic film on the surface 503b of the second prism 503 and emitted from the second prism 503 is incident on the third prism 504 from the surface 504a.
The G color light travels in the third prism 504 and undergoes total reflection on the surface 504b of the third prism 504. The G-color light totally reflected travels in the third prism 504 and is emitted from the surface 504c of the third prism 504.

The B color light emitted from the surface 502c of the first prism 502 is reflected by the reflection light valve 107B for B color light.
As illumination light. Similarly to the B color light, the R color light emitted from the surface 503c of the second prism 503 and the G color light emitted from the surface 504c of the third prism 504 are each a reflection type light valve 107R for R color light,
Further, the light enters the reflection light valve 107G for G color light as illumination light. The reflective light valves for each color are the same as those used in the first embodiment, and the description thereof will be omitted.

The B-color light reflected and emitted from the B-color light reflection type light valve 107B travels in the direction of the incident optical axis in the opposite direction.
The light enters the first prism 502 from the surface 502 c of the prism 502 and exits from the surface 502 a of the first prism 502. Like the B color light, the reflection type light valve 1 for the R color light
07R and reflection light valve 107G for G color light
The R color light and the G color light that have reflected and exited travel in the incident optical axis in opposite directions. The R color light is supplied to the second prism 50.
3 is incident on the second prism 503 from the surface 503c and is incident on the first prism 502, and then the first prism 502
From the surface 502a. The G color light is incident on the third prism 504 from the surface 504c of the third prism 504, and is transmitted through the second prism 503 to the first prism 502.
After that, the light is emitted from the surface 502a of the first prism 502. That is, the surface 502a of the first prism 502
Emits a color composite light of B color light, R color light and G color light. The emitted color composite light is incident on the polarizing beam splitter 501 from the surface 501a, and the polarization splitting unit polarizes and separates the modulated light (S-polarized light) as reflected light and the unmodulated light (P-polarized light) as transmitted light. ) Is done. The S-polarized light is the surface 501 b of the polarization beam splitter 501.
Is emitted from. On the other hand, P-polarized light is discarded as unnecessary light. Note that the first prism 502, the second prism 503, and the third prism 504 constitute a color separation / combination composite prism.

The exit surface 50 of the polarizing beam splitter 501
A wavelength-selective phase plate 205 is provided near 1b. FIG. 10 is a diagram illustrating a specific example of the wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 205. Wavelength selective phase plate 2
Reference numeral 05 converts incident light having a wavelength around 580 nm in the R color light into polarized light having a different vibration direction and emits the converted light. Here, of the incident S-polarized light, a wavelength of 580 nm
Only the region containing the peak spectrum of is converted into P-polarized light,
Light in other wavelength regions is emitted as S-polarized light. As described above, the wavelength phase plate 205 according to the third embodiment performs polarization conversion only in an unnecessary wavelength region.

A polarizing film 402 is provided near the wavelength-selective phase plate 205. The polarizing film 402
S-polarized light of the incident light is transmitted and emitted, and P-polarized light is absorbed.
The color-combined light emitted from the wavelength-selective phase plate 205 is incident on the polarizing film 402, so that the S-polarized R color light (excluding wavelengths around 580 nm), B color light, and G color light
The modulated light of the color light is incident on the projection lens 108. Thereby, a full-color image is projected on a screen (not shown). Spectral components near the wavelength of 580 nm are P-polarized light, and are therefore absorbed by the polarizing film 402 and are not projected on the screen. That is, the peak component having a wavelength of 580 nm is removed as unnecessary light.

According to the third embodiment described above,
The light emitted from the light source 101 is a single polarization converter 10
2 converts the light into P-polarized light. The converted P-polarized light is
The first prism 502, the second prism 503, and the third prism
The light enters the color separation / combination composite prism constituted by the prism 504 from the surface 502 a of the first prism 502. The light separated by the color separation / combination compound prism is modulated for each color. The modulated light of each color is color-combined by the color separation / combination composite prism, and is emitted from the surface 502a of the first prism 502 as color-combined light of B color light, R color light, and G color light. This emitted light, that is, S-polarized light is incident on the wavelength-selective phase plate 205 via the polarization beam splitter 501. Here, the component having a wavelength of 580 nm is included in the R color light and subjected to color separation and synthesis. The wavelength-selective phase plate 205 has a wavelength of 580 n
Only the light around m is converted to P-polarized light and emitted.
Transmits polarized light. The polarizing film 402 transmits S-polarized light and absorbs P-polarized light in the light emitted from the wavelength-selective phase plate 205. As a result, the wavelength region of 580 nm included in the R color light, that is, unnecessary light is cut.

In the above description, the color separation and synthesis are performed by including the peak spectral component having a wavelength of 580 nm in the R color light, but may be included in the G color light instead of the R color light.

In the above description, the light valve used is a reflection type light valve. However, the present invention can be applied to a projection type display device using a transmission type light valve. In this case, a polarizing plate is disposed on each of the incident side and the emitting side of the transmission type light valve for each of the separated colors, and these polarizing plates form a polarization separation optical system and an analysis optical system. The analysis light of the predetermined polarization emitted from the light valve is incident on the projection lens via the color combining optical system.

The correspondence between each component in the claims and each component in the first embodiment of the present invention will be described. Polarizing beam splitters 105 and 1
04 corresponds to a polarization separation optical system. Light valve 107G for G color light, reflective light valve 107R for R color light
(Reflection light valve 107B for B color light) corresponds to the light valve. The polarization beam splitters 104, 105 and 106, the half-wave phase plate 301, and the wavelength-selective phase plate 203 correspond to a first analysis optical system. The wavelength-selective phase plate 204 corresponds to the first wavelength-selective phase plate.
The polarizing film 401 corresponds to the second analyzing optical system. The projection lens 108 corresponds to a projection optical system. G color corresponds to the first color. The R (B) color corresponds to the second color. The polarization beam splitter 105 corresponds to the first color analysis optical system. The polarization beam splitter 104 corresponds to the second color analysis optical system. Single polarization converter 102, wavelength-selective phase plate 201
And the polarization beam splitter 103 correspond to a color separation optical system. The wavelength-selective phase plate 201 corresponds to a second wavelength-selective phase plate.

The correspondence between each component in the claims and each component in the second embodiment of the present invention will be described. The polarization beam splitter 104 corresponds to a polarization separation optical system. Light valve 107 for G color light
The reflection light valve 107R for G and R light (the reflection light valve 107B for B light) corresponds to the light valve. The polarization beam splitters 105 and 104
Corresponds to the analysis optical system. The wavelength selective phase plate 203 is the first
It corresponds to a wavelength-selective phase plate. Polarizing beam splitter 1
06A corresponds to the second light analysis optical system. Projection lens 108
Corresponds to the projection optical system. G color corresponds to the first color. R
(B) The color corresponds to the second color. Single polarization converter 102,
The wavelength-selective phase plate 201A and the polarization beam splitter 103 correspond to a color separation optical system. The wavelength-selective phase plate 201A corresponds to a second wavelength-selective phase plate.

The correspondence between each component in the claims and each component in the third embodiment of the present invention will be described. The polarization beam splitter 501 corresponds to a polarization separation optical system and a first analysis optical system. The reflection light valve 107R for R light and the reflection light valve 107B for B light correspond to the light valve. The wavelength-selective phase plate 205 corresponds to the first wavelength-selective phase plate.
The polarizing film 402 corresponds to the second analyzing optical system. The projection lens 108 corresponds to a projection optical system.

[0048]

According to the present invention as described in detail above, the following effects can be obtained. That is, according to the first and seventh aspects of the present invention, the incident light from the light source is polarized and separated and emitted to the light valve, and the light modulated by the light valve is converted into a specific polarization component by the first analyzing optical system. To be analyzed. The detection light from the first detection optical system is incident on a wavelength-selective phase plate, and the vibration direction of one of a necessary wavelength region and an unnecessary wavelength region is changed. Light emitted from the wavelength-selective phase plate is incident on the second detection optical system to cut off light in unnecessary wavelength regions. Thereby, light in an unnecessary wavelength region included in the incident light from the light source can be removed.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a projection display device according to a first embodiment.

FIG. 2 shows an example of an emission spectrum of a high-pressure mercury lamp.

FIG. 3A is a diagram illustrating wavelength-polarization conversion rate characteristics of a wavelength-selective phase plate 201; FIG. 3B is a diagram illustrating a wavelength-polarization conversion rate characteristic of the wavelength-selective phase plate 202. (c) is a diagram showing the wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 203.
(d) is a diagram illustrating wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 204.

4A is a diagram illustrating light incident on a wavelength-selective phase plate 201. FIG. FIG. 3B is a diagram illustrating light emitted from the wavelength-selective phase plate 201. (c) is a diagram illustrating light transmitted through the polarization beam splitter 103. (d) is a diagram illustrating the reflected light of the polarization beam splitter 103. (e) is a diagram illustrating light emitted from the wavelength-selective phase plate 202. (f) Light valve 107B for B color light
FIG. 6 is a diagram showing modulated light (P-polarized light) emitted from the light source and modulated light (S-polarized light) emitted from the light valve for R color light 107R. (g) is a diagram illustrating modulated light (P-polarized light) emitted from the light valve 107G for G color light. (h) is a diagram illustrating light emitted from the wavelength-selective phase plate 203. FIG. 3I is a diagram illustrating light emitted from a half-wave phase plate 301. (j) is a diagram illustrating light emitted from the polarization beam splitter 106. (k) is a diagram illustrating light emitted from a wavelength-selective phase plate 204. FIG. (l) is a diagram illustrating light emitted from a polarizing film 401. FIG.

FIG. 5 is a diagram illustrating a specific example of wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 201 and the wavelength-selective phase plate 204.

FIG. 6 is a basic configuration diagram of a projection display device according to a second embodiment.

FIG. 7 is a diagram showing wavelength-polarization conversion rate characteristics of a wavelength-selective phase plate 201A.

FIG. 8A is a diagram illustrating light incident on a wavelength-selective phase plate 201A. FIG. 4B is a diagram illustrating light emitted from a wavelength-selective phase plate 201A. (c) is a diagram illustrating light transmitted through the polarization beam splitter 103. (d) is a diagram illustrating the reflected light of the polarization beam splitter 103. (e) is a diagram illustrating light emitted from the wavelength-selective phase plate 202. (f) Light valve 10 for B color light
It is a figure showing the modulated light (P polarization) emitted from 7B, and the modulated light (S polarization) emitted from the light valve 107R for R color light. (g) is a diagram illustrating modulated light (P-polarized light) emitted from the light valve 107G for G color light. (h) is a diagram illustrating light emitted from the wavelength-selective phase plate 203. FIG. 3I is a diagram illustrating light emitted from a half-wave phase plate 301. (j) is a diagram illustrating light emitted from the polarization beam splitter 106A. (k) is a diagram illustrating light emitted from a wavelength-selective phase plate 204. FIG.

FIG. 9 is a basic configuration diagram of a projection display device according to a third embodiment of the present invention.

FIG. 10 is a diagram illustrating a specific example of wavelength-polarization conversion rate characteristics of the wavelength-selective phase plate 205.

[Explanation of symbols]

101: light source 102: single polarization converter 108: projection lens 103, 104, 10
5,106,106A, 501 ... polarizing beam splitter,
107R, 107G, 107B ... Reflective light valve, 2
01, 201A, 202, 203, 204, 205... Wavelength-selective phase plate, 301.
01,402 ... Polarizing film

Claims (7)

[Claims] A light source that supplies illumination light; a polarization separation optical system that receives light from the light source, and separates the incident light into a specific polarization component and emits the polarized light; A light valve that modulates and emits the light polarized and separated by the separation optical system, a first analysis optical system that detects the light emitted from the light valve into a specific polarization component, and emits the light; A first wavelength-selective phase plate that receives light from the analysis optical system, changes the vibration direction of light in one of a necessary wavelength region and an unnecessary wavelength region, and emits the light. Analyze the light emitted from the phase plate,
A second analysis optical system that cuts light in the unnecessary wavelength region; and a projection optical system that projects light in the required wavelength region emitted from the second analysis optical system. Projection display device. 2. The projection type display device according to claim 1, further comprising: a polarization beam splitter having a function of said polarization separation optical system and a function of said first analysis optical system. Type display device. 3. The projection type display device according to claim 1, wherein the light valve modulates and emits the first color light.
A second light valve that modulates and emits a second color light, wherein the first light analysis optical system is for a first color that detects the first color light emitted from the first light valve. An analysis optical system; and a second color analysis optical system for analyzing the second color light emitted from the second light valve, wherein the light from the light source is divided into the first color light and the second color light. And a polarized light having vibration directions orthogonal to each other from the first color analysis optical system side and the second color analysis optical system side, respectively, received on different surfaces. And a polarization beam splitter for color-combining light incident from the first color analysis optical system and light incident from the second color analysis optical system. Display device. 4. The projection display device according to claim 1, further comprising a color separation optical system for separating light from the light source into the first color light and the second color light. A first light valve that modulates and emits the first color light, and a second light valve that modulates and emits the second color light. The first color light and the second color light, which are polarized lights in the vibration direction, are respectively emitted as analysis light, and the first wavelength-selective phase plate detects the first color light and the second color light. The second light analyzing optical system is disposed in one of the light paths through which the light passes, and the second light analyzing optical system is a color synthesizing optic for performing color synthesis of the light of the first color and the light of the second color. A projection display device comprising a polarizing beam splitter also serving as a system. 5. The projection display device according to claim 1, wherein the light valve modulates and emits the first color light and a second light valve that modulates and emits the second color light. A light valve, wherein the polarization separation optical system includes a color separation optical system that separates light from the light source into the first color light and the second color light including light in the unnecessary wavelength region, A color conversion optical system that receives light from the light source and emits polarized light in a specific vibration direction; and any one of the first color light and the second color light emitted from the polarization conversion device. A second wavelength-selective phase plate that converts one of the vibration directions; and a polarized light that receives light emitted from the second wavelength-selective phase plate and separates and emits the first color light and the second color light. A beam splitter, the first wavelength-selective phase plate Is a projection type display device, wherein the vibration direction of one of the light of the necessary wavelength region and the light of the unnecessary wavelength region of the first color light is changed. 6. The projection type display device according to claim 1, wherein the light source is a metal halide lamp or a high-pressure mercury lamp, and a wavelength range of unnecessary light is around 580 nm. Display device. 7. A polarization separation optical system that receives light from a light source, separates the incident light into a specific polarization component and emits the light to a light valve, and receives light modulated by the light valve. A first detection optical system that detects and emits a specific polarization component, and a light that exits the first detection optical system is incident thereon, and a light of one of a necessary wavelength region and an unnecessary wavelength region is input. A wavelength-selective phase plate that emits light while changing the vibration direction; and a second analyzing optical system that detects light emitted from the wavelength-selective phase plate and cuts light in the unnecessary wavelength region. An optical block for removing unnecessary light.