JP2005241905A - Projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device which separates the light from a light source to a plurality of color light and can make an optical system smaller. <P>SOLUTION: The light from the light source is polarized by a polarizing optical system and is then color separated by a color separation optical system. The color separated light is guided to two light valves by which the light is modulated with color signals for the respective rays of the color light. Only the modulated light is analyzed by a detection optical system and after each color light is color composited by the color composition optical system, the light is projected by a projection lens. The light is color separated to the plurality of the rays of the color light and is modulated by the two light valves and therefore the optical system of the projection type display device can be made smaller than in the case the light valves are arranged for the respective rays of the color light. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a projection display device.

FIG. 6 shows a configuration of a projection display device using a conventional reflective light valve.
The light emitted from the light source 101 enters the polarization conversion illumination device 102 and is converted into light polarized in a direction perpendicular to the paper surface. The light emitted from the polarization conversion illumination device 102 reflects R (red) light and G (green) light and reflects dichroic mirror 103RG having a characteristic of transmitting B (blue) light, and B (blue) light. A dichroic mirror 103B having a characteristic of transmitting R (red) light and G (green) light is incident on a cross dichroic mirror 103 arranged orthogonally to each other, and a combined light of R light and G light traveling in opposite directions to each other , Color separation into B light.

  The color-separated B light is incident on the deflecting mirror 105 at the center of the light beam at an incident angle of 45 degrees, reflected, and incident on the polarization beam splitter 107B. The light incident on the polarization beam splitter 107B is incident on the polarization separator at an incident angle of 45 degrees and reflected, exits from the polarization beam splitter 107B, and enters the B-light reflective light valve 109B.

  On the other hand, the color-separated mixed light of R light and G light is incident on the deflecting mirror 104 with the central light beam at an incident angle of 45 degrees, and is reflected and transmitted through the R light and incident on the G light reflecting dichroic mirror 106. Is incident at 45 degrees. The light is separated into G light reflected from the dichroic mirror 106 and R light traveling through the light, and is incident on polarization beam splitters 107G and 107R in which two triangular prisms are formed with a polarization separation portion sandwiched therebetween. The light incident on the polarization beam splitters 107G and 107R is incident on and reflected from the respective polarization separators at an incident angle of 45 degrees, and exits from the polarization beam splitter. The polarized light beams 108G, The light enters the R-light reflective light valve 108R.

Each color light incident on the light valve for each color light is modulated by a color signal, reflected and emitted, and again incident on each of the polarization beam splitters 107B, 107G, and 107R, and the modulated light passes through the polarization separation unit. The light is separated and incident on a cross dichroic prism 109 for color synthesis. The cross dichroic prism 109 is composed of an R light reflecting dichroic film 109R and a B light reflecting dichroic film 109B which are arranged orthogonally to the inside thereof. Each color light incident from different incident surfaces of the cross dichroic prism 109 is color-combined and emitted, enters the projection lens 110, and a full-color image is projected onto a screen (not shown).
JP-A-10-133301

  However, in the above-described projection type display device, the light from the light source is separated into three colors, the polarization beam splitter and the reflection type light valve are arranged for each, and the color synthesis optical system is further arranged. There was a problem of becoming.

  An object of the present invention is to reduce an optical system in a projection display device that separates light from a light source into a plurality of color lights.

According to the first aspect of the present invention, a polarization optical system that polarizes light from a light source, and light polarized by the polarization optical system is color-separated into mixed light of first color light and second color light and third color light. A color separation optical system that separates the mixed light of the first color light and the second color light into the first color light and the second color light in time series, and the first color light and the second color light. A first light valve that is incident in time series, a second light valve that receives the third color light, and a first light that detects the first color light and the second color light modulated by the first light valve. An analyzer; a second analyzer that analyzes the third color light modulated by the second light valve; the first color light that is analyzed by the first analyzer; the second color light; A projection display device comprising: a color synthesis optical system for color synthesis of the third color light analyzed by the second analyzer To provide.

  According to a second aspect of the present invention, a polarization optical system that polarizes light from a light source, and light that is polarized by the polarization optical system is color-separated into mixed light of first color light and second color light and third color light. A color separation optical system that separates the mixed light of the first color light and the second color light into the first color light and the second color light in time series, and the first color light and the second color light. The first reflective light valve incident in time series, the second reflective light valve in which the third color light enters, and the first color light and the second color light are polarized and separated in time series. A first polarization beam splitter that is incident on the first reflective light valve and detects the light that is modulated and emitted by the first reflective light valve; 2 is incident on the reflective light valve 2 and the light emitted after being modulated by the second reflective light valve is detected. The second polarization beam splitter, the first color light detected by the first polarization beam splitter, the second color light, and the third color light detected by the second polarization beam splitter are color-synthesized A projection-type display device comprising a combining optical system is provided.

  According to a third aspect of the present invention, there is provided a polarization optical system that polarizes light from a light source, a light that is polarized by the polarization optical system, a mixed light of the first color light and the second color light, and a third color light in time series. A color separation optical system that performs color separation, a color polarizer that rotates the polarization direction of the first color light by 90 degrees, a first reflective light valve that receives the first color light, the second color light, and the first color light. A second reflective light valve on which three-color light is incident in time series, a mixed light of the first color light and the second color light incident on the time series, and the third color light are separated by polarization and color-separated. The first color light is incident on the first reflective light valve, the second color light and the third color light are incident on the second reflective light valve in time series, and the first reflective light valve and the second A polarizing beam splitter that detects the light modulated and emitted by the reflective light valve. To provide a projection type display apparatus according to claim Rukoto.

According to a fourth aspect of the present invention, there is provided a polarization optical system that polarizes light from a light source, light that has been polarized by the polarization optical system, first mixed light of first color light and second color light, and third color light. A color separation optical system that performs color separation into second mixed light and fourth color light; and a first time series color separation that separates the first mixed light into the first color light and the second color light in time series. An optical system; a second time-series color separation optical system that color-separates the second mixed light into the third color light and the fourth color light in time series; and the first color light and the second color light. A first reflective light valve incident in series, a second reflective light valve in which the third color light and the fourth color light are incident in time series, the first color light and the second color light; Polarized light is sequentially separated and incident on the first reflective light valve, and the light modulated and emitted by the first reflective light valve is analyzed. The polarization beam splitter, the third color light and the fourth color light are polarized and separated in a time series and incident on the second reflective light valve, and the light modulated and emitted by the second reflective light valve is detected. A second polarizing beam splitter that emits light, the first color light that has been analyzed by the first polarizing beam splitter, the second color light, and the third color light and fourth color light that have been analyzed by the second polarizing beam splitter. And a color composition optical system for color composition of the projection display device.
According to a fifth aspect of the present invention, there is provided a polarizing optical system that polarizes light from a light source, light that has been polarized by the polarizing optical system, first mixed light of the first color light and the second color light, and the first A time-series color separation optical system for color-separating into three-color light and second-mixed light of the fourth-color light; color-separating the first mixed light into the first-color light and the second-color light; A color separation optical system that separates two mixed lights into the third color light and the fourth color light; a first reflective light valve that receives the first color light and the third color light in time series; and A second reflective light valve in which the second color light and the fourth color light are incident in time series, and the first colored light and the third color light are polarized and separated in time series into the first reflective light valve. A first polarizing beam splitter that detects the light that is incident and modulated and emitted by the first reflective light valve; A second polarizing beam splitter that separates the color light and the fourth color light in a time-sequentially polarized manner and enters the second reflective light valve, and detects the light that is modulated and emitted by the second reflective light valve; Color combining optics for color combining the first color light and the third color light detected by the first polarization beam splitter and the second color light and the fourth color light detected by the second polarization beam splitter And a projection display device characterized by comprising a system.
According to a sixth aspect of the present invention, there is provided a polarization optical system that polarizes light from a light source, and first mixed light of the first color light and the second color light in a time-series manner for light polarized by the polarization optical system. A time-series color separation optical system that performs color separation into second mixed light of third color light and fourth color light, a color polarizer that rotates the polarization directions of the first color light and the third color light by 90 degrees, A first reflective light valve on which the first color light and the third color light are incident in time series; a second reflective light valve on which the second color light and the fourth color light are incident in time series; The first mixed light and the second mixed light incident in time series are polarized and separated, and the first color light and the third color light are incident on a first reflective light valve, and the second color light and the fourth color light are incident on the first reflective light valve. Color light is incident on a second reflective light valve, and the first reflective light valve and the second reflective light valve A projection-type display device comprising: a polarizing beam splitter that analyzes light emitted after being modulated by the first color light, color-synthesizes the first color light, the second color light, the third color light, and the fourth color light. I will provide a.

  The invention according to claim 7 is characterized in that the first color light, the second color light, and the third color light are any one color light of red light, blue light, and green light, respectively. Or the projection type display apparatus of Claim 3 is provided.

  The invention according to claim 8 is characterized in that the first color light, the second color light, the third color light, and the fourth color light are respectively one color light of red light, blue light, green light, and emerald light. A projection display device according to claim 4 or claim 5 or claim 6 is provided.

  The present invention can provide a projection display device capable of reducing the optical system in a projection display device that separates light from a light source into a plurality of color lights.

(First embodiment)
FIG. 1 is a configuration diagram of a projection display device according to the first embodiment. The light emitted from the light source 11 composed of the lamp and the concave mirror enters the polarization conversion illumination device 12. The polarization conversion illumination device 12 has a plurality of combinations of a first lens plate, a second lens plate, a polarization conversion unit and a reflection layer (not shown) arranged in an array, and a 1/2 wavelength phase plate is arranged on a predetermined exit surface. The polarization conversion composite prism device and the condenser lens. Light from the light source is converted into polarized light polarized in a direction perpendicular to the paper surface by the polarization conversion illumination device 12. The light emitted from the polarization conversion illumination device 12 is incident on a dichroic mirror 13 that reflects R (red) light and transmits G (green) light and B (blue) light, and is reflected by the dichroic mirror 13. The light is separated into light and mixed light of G light and B light that travels through.

The R light color-separated by the dichroic mirror 13 enters the polarization beam splitter 15R, is reflected by the polarization separation unit, exits, and enters the reflective light valve 16R disposed for the R light. The mixed light of G light and B light that has passed through the dichroic mirror 13 enters the time-series color separation optical system 14. The time-series color separation optical system 14 divides a disk-shaped glass substrate into two by a line passing through the center, forms a dichroic film (not shown) that transmits G light and reflects B light on one side, and B on the other side. A dichroic film (not shown) that transmits light and reflects G light is formed, and can rotate around a central axis O ′. When the mixed light of G light and B light is incident on the portion of the time series color separation optical system 14 where the glass-based dichroic film is formed and the time series color separation optical system 14 is rotated, the G light and B light are emitted. The light is emitted from the time-series color separation optical system 4 alternately in time series. The color-separated G light and B light enter the polarization beam splitter 15GB, are reflected by the polarization separation unit, and alternately enter the reflection type light valve 16GB in time series. The G light and the B light are modulated by the reflection type light valve 16GB by the respective color signals, and then reflected in time series. The reflective light valve 16GB modulates each color light in synchronization with the time-series color separation optical system 14.
The light emitted from the reflection type light valve 16GB is incident on the polarization beam splitter 16GB again, the modulated light is transmitted through the polarization separation unit and analyzed, and the G light and the B light are alternately colored in time series. The light enters the combining optical system 17.

  On the other hand, the R light is incident on the reflection type light valve 16R and modulated, then reflected and incident again on the polarization beam splitter 16R, and the modulated light is transmitted through the polarization separation unit and analyzed, and is input to the color synthesis optical system 17. The light is incident from a surface different from the incident surface of the G light and B light.

  The color synthesis optical system 17 is a dichroic prism composed of two prisms joined with a dichroic film 17D having a characteristic of reflecting R light and transmitting G light and B light. The R light incident on the color combining optical system 17 is reflected by the dichroic film 17D, and the G light and B light incident in time series are transmitted through the dichroic film 17D to be color combined. The color-synthesized light enters the projection lens 18 and is projected as a full-color image on a screen (not shown).

In the projection display device of this embodiment, the light is separated into three colors and projected, but there are two reflection type light valves and two polarization beam splitters used, and the entire optical system is compared with the conventional example. And can be made small.
(Second Embodiment)
FIG. 2 shows a configuration diagram of a projection display apparatus according to the second embodiment of the present invention. Since the light source 21 and the polarization conversion illumination device 22 are the same as those in the first embodiment, description thereof is omitted.

The light emitted from the polarization conversion illumination device 22 is color-separated into R light and mixed light of B light and G light in time series by the time series color separation optical system 28. The time-series color separation optical system 28 divides a disk-shaped glass substrate into two by a line passing through the center, and forms a dichroic film (not shown) that transmits R light and reflects G light and B light on one side. On the other hand, a dichroic film (not shown) that transmits B light and G light and reflects R light is formed, and can be rotated around a central axis O ′. When the light emitted from the polarization conversion illumination device 22 is incident on the portion of the time-series color separation optical system 28 where the glass-based dichroic film is formed and the time-series color separation optical system 28 is rotated, R light and B Light and mixed light of G light are alternately emitted in time series.
R light, B light, and G light mixed light emitted alternately from the time-series color separation optical system 28 enter the color polarizing filter 29. The color polarizer 29 rotates the polarization direction of the B light by 90 degrees and does not rotate the polarization directions of the R light and the G light.
When mixed light of B light and G light is incident, the polarization direction of the B light is rotated by 90 degrees and is incident on the polarization beam splitter 25. The incident B light passes through the polarization separation film of the polarization beam splitter 25 and enters the reflection type light valve 26B. On the other hand, the oscillation direction of the polarization of the G light incident on the color polarizer 29 does not change and enters the polarization beam splitter 25. The incident G light is reflected by the polarization separation film and enters the reflective light valve 26RG.
The B light and R light incident on the reflection type light valves 26B and 26RG are respectively modulated by the reflection type light valves 26B and 26RG, then reflected and incident on the polarization beam splitter 25 again. The modulated light of B light is analyzed as reflected light of polarization separation, and the modulated light of R light is analyzed as transmitted light. The B light and R light are color-combined and emitted from the polarization beam splitter 25. The color-combined B light and R light are projected onto a screen (not shown) by the projection lens 27.
Next, when the R light emitted from the color polarizer 29 enters the polarization beam splitter 25, the incident R light reflects off the polarization separation film of the polarization beam splitter 25 and enters the reflective light valve 26RG.
The R light incident on the reflection type light valve 26RG is modulated by the reflection type light valve 26RG, then reflected and incident on the polarization beam splitter 25 again. The modulated light of R light is analyzed as transmitted light, emitted from the polarization beam splitter 25, and projected on a screen (not shown) by the projection lens 27.
A full color projection image is projected on the screen by alternately projecting the mixed light of the B light and the G light and the R light. Note that the time-series color separation optical system 28 and the reflection type light valves 26B and 26RG are synchronized, and the reflection type light valve 26RG is modulated with modulation signals of the respective color lights of R light and G light.
In the projection type display device of this embodiment, the light is separated into three colors and projected, but two reflection light valves and one polarization beam splitter are used, and the entire optical system is a conventional example. The size can be reduced compared to
In addition, since the reflective light valve 26B of this embodiment is used only for B light, a reflective light valve having a smaller number of pixels than the number of pixels of the reflective light valve 26RG on which G light and R light are incident is used. However, it is possible to project a projected image having the same image quality as in the first embodiment. For example, when the number of pixels of the reflective light valve 26RG is 1080 pixels, the number of pixels of the reflective light valve 26B can be 720 pixels. As a result, the cost of the reflective light valve 26B can be reduced, and the cost can be reduced as well as downsizing of the optical engine.
In this embodiment, the color polarizer 29 that rotates the polarization direction of the B light by 90 degrees is used. However, the color polarizer 29 that rotates the polarization directions of the G light and the R light by 90 degrees is used. It doesn't matter. In this case, the R light and G light incident on the polarization beam splitter are transmitted through the polarization separation unit and incident on the reflective light valve in time series, and the B light is reflected and incident on the reflective light valve.
(Third embodiment)
FIG. 3 shows a configuration diagram of the projection type display apparatus of the third embodiment. The light source 31 and the polarization conversion illumination device 32 have the same configuration as in the first embodiment, and the light emitted from the polarization conversion illumination device 32 is polarized light that vibrates in a direction perpendicular to the paper surface.

  The light emitted from the polarization conversion illumination device 32 enters the dichroic mirror 33. The dichroic mirror 33 has a characteristic of reflecting light having a wavelength shorter than 520 nm and transmitting light having a wavelength longer than 520 nm, and color-separates it into first color light to be transmitted and second color light to be reflected.

  The first color light having a wavelength longer than 520 nm transmitted through the dichroic mirror 33 is deflected by 90 degrees by the deflection mirror 35 and enters the time-series color separation optical system 37. The time-series color separation optical system 37 divides a disk-shaped glass substrate into two by a line passing through the center, and transmits a dichroic film (not shown) that transmits R (red) light and reflects G (green) light on one side. A dichroic film (not shown) that transmits G light and reflects R light is formed on the other side, and can be rotated around a central axis O ′. When the first color light is incident on the glass substrate of the time series color separation optical system 37 where the dichroic film is formed and the time series color separation optical system 37 is rotated, the R light and the G light are alternately time series color separation. The light is emitted from the optical system 37.

  On the other hand, the second color light having a wavelength shorter than 520 nm reflected by the dichroic mirror 33 is deflected by 90 degrees by the deflection mirror 34 and enters the time-series color separation optical system 36. The time-series color separation optical system 36 divides a disk-shaped glass substrate into two by a line passing through the center, and transmits a dichroic film (not shown) that transmits B (blue) light and reflects E (emerald) light on one side. A dichroic film (not shown) that transmits E light and reflects B light is formed on the other side, and can be rotated around a central axis O ′. When the second color light is incident on the portion of the time series color separation optical system 36 where the dichroic film is formed on the glass substrate and the time series color separation optical system 36 is rotated, the B light and the E light are alternately time series color separation. The light is emitted from the optical system 36.

  The B light and the E light emitted alternately from the time-series color separation optical system 36 enter the polarization beam splitter 37BE, are reflected by the polarization separation unit, and enter the reflection type light valve 38BE. The B light and the E light incident on the reflection type light valve 38BE in time series are respectively subjected to the modulation action by the color signal and emitted, enter the polarization beam splitter 37BE again, and the modulated light is transmitted through the polarization separation unit. Analyze. The analyzed B light and E light are incident on the color synthesis optical system 39 alternately.

  R light and G light emitted alternately from the time-series color separation optical system 37 are incident on the polarization beam splitter 37RG, reflected by the polarization separation unit, and incident on the reflective light valve 38RG. The R light and G light incident on the reflection type light valve 38RG in time series are each subjected to a modulation action by a color signal and emitted, and are incident on the polarization beam splitter 37RG again, and the modulated light is transmitted through the polarization separation unit. Analyze. The analyzed R light and G light are alternately incident on a surface of the color synthesis optical system 39 different from the surface on which the B light and R light are incident.

  The color synthesis optical system 39 is a synthesis prism in which two triangular prisms are joined with a dichroic film 39D having characteristics of reflecting R light and G light and transmitting B light and E light. The incident R light and G light detection lights are reflected by the dichroic film 39D. On the other hand, the B light and the E light pass through the dichroic film 39D, and are color-synthesized with the R light and G light analysis lights. The color-combined light enters the projection lens 40, and a full-color image is projected on a screen (not shown).

In the present embodiment, unlike the first and second embodiments, the light source light is color-separated into B light, E light, G light, and R light, and each light is modulated by the reflective light valves 37BE and 37RG. Since the color-combined light is projected, light of four colors obtained by adding E light to R light, G light, and B light is used for the projected image, so that color reproducibility is improved.
Note that there are two reflective light valves and one polarization beam splitter used in this embodiment, and the entire optical system can be made smaller than the conventional example.
(Fourth embodiment)
FIG. 4 shows a configuration diagram of a projection display apparatus according to the fourth embodiment.

This embodiment is the same as the third embodiment in that the light from the light source is separated into four color lights of R light, G light, E light, and B light, but the configuration of the color separation optical system is different.
The light emitted from the light source 31 and the polarization conversion illumination optical system 32 and polarized in the direction perpendicular to the paper surface enters the time-series color separation optical system 41. The time-series color separation optical system 41 divides a disk-shaped glass substrate into two by a line passing through the center, and a dichroic film (not shown) that transmits R light and B light and reflects G light and E light on one side. A dichroic film (not shown) that transmits G light and E light and reflects R light and B light is formed on the other side, and can be rotated around a central axis O ′. When the light from the polarization conversion illumination optical system 32 is incident on the portion of the glass substrate of the time-series color separation optical system 41 where the dichroic film is formed and the time-series color separation optical system 41 is rotated, R light and B light And mixed light of G light and E light are alternately emitted from the time-series color separation optical system 41.

The light emitted from the time series color separation optical system 41 enters the dichroic mirror 42. The dichroic mirror 42 has characteristics of reflecting the B light and the E light and transmitting the G light and the R light. The mixed light of the R light and the B light incident on the dichroic mirror 42 is the R light. The transmitted B light is reflected and separated into colors. In the next mixed light of the G light and the E light, the G light is transmitted and the E light is reflected and separated into colors. The B light and the E light reflected by the dichroic mirror 42 alternately enter the polarization beam splitter 37BE, are reflected by the polarization separation unit, and enter the reflective light valve 38BE. Incident in time series.
On the other hand, the R light and G light transmitted through the dichroic mirror 42 are alternately incident on the polarization beam splitter 37RG, reflected by the polarization separation unit, and incident on the reflective light valve 38RG.

The B light and E light incident on the reflection type light valve 38BE are modulated by the respective color signals and emitted, and again incident on the polarization beam splitter 37BE, and the transmitted modulated light is taken out as analysis light. The analyzed B light and E light enter the color synthesis optical system 39. The R light and G light incident on the reflection type light valve 38RG are modulated and emitted by the respective color signals, enter the polarization beam splitter 37RG again, and extract the transmitted modulated light as the analysis light. The analyzed R light and G light enter the color combining optical system 39 from a surface different from the incident surfaces of the B light and the E light. The reflective light valves 38RG and 38BE and the time-series color separation optical system 41 are synchronized, and each color light is modulated by a color signal synchronized with the color light incident on the reflective light valves 38RG and 38BE in time series. .
The color synthesis optical system is formed by joining two triangular prisms with a dichroic film 39D having characteristics of transmitting B light and E light and reflecting R light and G light, and is incident on the color synthesis optical system 39. The B light and the E light are transmitted through the dichroic film 39D, and the R light and the G light are reflected and synthesized in color. The color-combined light enters the projection lens 40, and a full-color image is projected on a screen (not shown).

The projection display device of the present embodiment can achieve the same effects as those of the third embodiment.
(Fifth embodiment)
FIG. 5 shows a configuration diagram of a projection display apparatus of the fifth embodiment. This embodiment is the same as the third and fourth embodiments in that the light from the light source is separated into four color lights of R light, G light, E light, and B light, but the configuration of the color separation optical system is different. Yes.
The polarized light emitted from the light source 51 and the polarization conversion illumination device 42 enters the time-series color separation optical system 53. The time-series color separation optical system 53 is the same as the time-series color separation optical system 41 shown in the fourth embodiment, and the mixed light of the R light and the B light, and the mixed light of the G light and the E light. Inject alternately. The emitted light is incident on the color polarizer 54. The color polarizer 54 rotates the oscillation direction of the polarization of the G light and the R light by 90 degrees, and the mixed light of the R light and the B light alternately incident on the color polarizer 54, the G light, and the E light. Among the mixed lights, the vibration directions of the R light and the G light are rotated by 90 degrees and emitted.
The emitted light is incident on the polarization beam splitter 55. When mixed light of R light and B light enters, the oscillation direction of polarized light rotates 90 degrees, and the R light polarized in a direction parallel to the paper surface passes through the polarization separation film and enters the reflective light valve 56GR. . On the other hand, the B light whose polarization direction has not changed is reflected by the polarization separation film and enters the reflective light valve 56BE. Next, even in the mixed light of the G light and the E light incident on the polarization beam splitter 55, the G light similarly passes through the polarization separation film and enters the reflection type light valve 56GR, and the E light is reflected by the polarization separation film. And enters the knitting light bulb 56BE.

  The R light and G light alternately incident on the reflection type light valve 56GR are modulated by the respective color signals and emitted, enter the polarization beam splitter 55 again, and the modulated light is reflected by the polarization beam splitter and detected. Lighted. On the other hand, the B light and the E light alternately incident on the reflection type light valve 56BE are modulated by the respective color signals and emitted, enter the polarization beam splitter 55 again, and the modulated light passes through the polarization separation film and is analyzed. Is done. When the light is analyzed by the polarization separation film, color synthesis of R light and B light and color synthesis of G light and E light are also performed. The color-combined mixed light of R light and B light and the mixed light of G light and E light are alternately incident on the projection lens 57 and projected as a full-color image on a screen (not shown).

Also in the projection type display apparatus of this embodiment, the same effects as those of the third and fourth embodiments can be obtained.
In the first to fifth embodiments, the embodiment using the reflective light valve has been described. However, a transmissive light valve may be used instead of the reflective light valve. When a transmissive light valve is used, it is not necessary to use a polarizing beam splitter, but a modulator that serves as an analyzer is placed in the optical path of light emitted from the transmissive light valve to detect modulated light. .
In the first to fifth embodiments, the light from the light source is color-separated after being polarized by the polarization optical system, but may be polarized by the polarization optical system after the color separation.

The block diagram of the projection type display apparatus of 1st Embodiment. The block diagram of the projection type display apparatus of 2nd Embodiment. The block diagram of the projection type display apparatus of 3rd Embodiment. The block diagram of the projection type display apparatus of 4th Embodiment. The block diagram of the projection type display apparatus of 5th Embodiment. The block diagram of the conventional projection type display apparatus.

Explanation of symbols

11, 21, 31, 51 Light source 12, 22, 32, 52 Polarization conversion illumination device 13, 33, 42 Dichroic mirror 14, 28, 36, 37, 41, 53 Time-series color separation optical system 15R, 15GB, 25, 37RG , 37BE, 55 Polarizing beam splitter 17, 39 Color combining prism 34, 35 Deflection mirror 29, 54 Color polarizer 18, 27, 40, 57 Projection lens

Claims (8)

A polarizing optical system that polarizes light from the light source;
The light polarized by the polarization optical system is color-separated into a mixed light of a first color light and a second color light and a third color light, and the mixed light of the first color light and the second color light is time-sequentially described above. A color separation optical system for performing color separation into one color light and the second color light;
A first light valve on which the first color light and the second color light are incident in time series;
A second light valve on which the third color light is incident;
A first analyzer for analyzing the first color light and the second color light modulated by the first light valve;
A second analyzer for analyzing the third color light modulated by the second light valve;
A color synthesizing optical system that color-synthesizes the first color light and the second color light analyzed by the first analyzer and the third color light analyzed by the second analyzer; Projection type display device. A polarizing optical system that polarizes light from the light source;
The light polarized by the polarization optical system is color-separated into a mixed light of a first color light and a second color light and a third color light, and the mixed light of the first color light and the second color light is time-sequentially described above. A color separation optical system for performing color separation into one color light and the second color light;
A first reflective light valve on which the first color light and the second color light are incident in time series;
A second reflective light valve on which the third color light is incident;
The first color light and the second color light are polarized and separated in a time series and incident on the first reflection type light valve, and the light modulated and emitted by the first reflection type light valve is analyzed. One polarizing beam splitter;
A second polarization beam splitter configured to time-sequentially separate the third light so as to be incident on a second reflective light valve, and to detect light modulated and emitted by the second reflective light valve; A color combining optical system for color-combining the first color light and the second color light detected by the one polarization beam splitter and the third color light detected by the second polarization beam splitter; Projection type display device. A polarizing optical system that polarizes light from the light source;
A color separation optical system for color-separating the light polarized by the polarization optical system into a mixed light of the first color light and the second color light and a third color light in time series;
A color polarizer that rotates the polarization direction of the first color light by 90 degrees;
A first reflective light valve on which the first color light is incident;
A second reflective light valve on which the second color light and the third color light are incident in time series;
The mixed light of the first color light and the second color light incident in time series and the third color light are separated by polarization separation, the first color light is incident on the first reflective light valve, and the second color light is incident on the second reflection light valve. A polarization beam splitter that causes color light and the third color light to enter the second reflection type light valve in time series, and detects light that is modulated and emitted by the first reflection type light valve and the second reflection type light valve. And a projection display device. A polarizing optical system that polarizes light from the light source;
A color separation optical system that separates light polarized by the polarization optical system into first mixed light of first color light and second color light and second mixed light of third color light and fourth color light;
A first time-series color separation optical system for color-separating the first mixed light into the first color light and the second color light in time series;
A second time-series color separation optical system that separates the second mixed light into the third color light and the fourth color light in time series;
A first reflective light valve on which the first color light and the second color light are incident in time series;
A second reflective light valve on which the third color light and the fourth color light are incident in time series;
The first polarized light for detecting the light modulated and emitted by the first reflective light valve after the first colored light and the second colored light are polarized and separated in time series and incident on the first reflective light valve. A beam splitter,
Second polarized light for detecting the light modulated and emitted by the second reflective light valve after the third colored light and the fourth colored light are polarized and separated in time series and incident on the second reflective light valve. A beam splitter,
A color synthesis optical system for color-combining the first color light and the second color light detected by the first polarization beam splitter and the third color light and the fourth color light detected by the second polarization beam splitter. And a projection display device. A polarizing optical system that polarizes light from the light source;
Time series for color-separating light polarized by the polarization optical system into first mixed light of the first color light and second color light and second mixed light of the third color light and the fourth color light A color separation optical system;
A color separation optical system that color-separates the first mixed light into the first color light and the second color light, and color-separates the second mixed light into the third color light and the fourth color light;
A first reflective light valve on which the first color light and the third color light are incident in time series;
A second reflective light valve on which the second color light and the fourth color light are incident in time series;
The first polarized light that separates the first color light and the third color light in a time-series manner and enters the first reflective light valve, and detects the light that is modulated and emitted by the first reflective light valve. A beam splitter,
The second polarized light that separates the second color light and the fourth color light in a time-series manner and enters the second reflective light valve, and detects the light that is modulated and emitted by the second reflective light valve. A beam splitter,
A color synthesis optical system for color-synthesizing the first color light and the third color light detected by the first polarization beam splitter and the second color light and the fourth color light detected by the second polarization beam splitter. And a projection display device. A polarizing optical system that polarizes light from the light source;
When the light polarized by the polarization optical system is color-separated into the first mixed light of the first color light and the second color light and the second mixed light of the third color light and the fourth color light in time series Series color separation optical system,
A color polarizer that rotates the polarization directions of the first color light and the third color light by 90 degrees;
A first reflective light valve on which the first color light and the third color light are incident in time series;
A second reflective light valve on which the second color light and the fourth color light are incident in time series;
The first mixed light and the second mixed light incident in time series are polarized and separated, and the first color light and the third color light are incident on a first reflective light valve, and the second color light and the fourth color light are incident on the first reflective light valve. Colored light is incident on a second reflective light valve, light that is modulated and emitted by the first reflective light valve and the second reflective light valve is analyzed, and the first colored light, the second colored light, A projection-type display device comprising: a polarization beam splitter for color-combining the third color light and the fourth color light. 4. The projection according to claim 1, wherein the first color light, the second color light, and the third color light are each one of red light, blue light, and green light. 5. Type display device. The first color light, the second color light, the third color light, or the fourth color light is any one of red light, blue light, green light, and emerald light, respectively. The projection display device according to claim 6.