JP2007232800A - Projection video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mechanism for shifting a projected image without moving a device body without causing upsizing, heavy weighting and cost rising in a projection type video display device constituted to write an image in a light valve for generating projected image light with light. <P>SOLUTION: Specified polarized light transmitted through a polarizing beam splitter 24 is radiated to a writing light valve (LCOS device) 25. The writing light valve 25 generates image light by modulating the received specified polarized light. Writing image light emitted from the writing light valve 25 is radiated to respective readout light valves 31, 32 and 33. The writing light valve 25 is supported by a shift mechanism. The shift mechanism shifts the writing light valve 25 up and down and right and left on a plane perpendicular to an image writing optical axis. By operating an adjusting dial 442, the writing light valve 25 is moved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection display apparatus in which image writing to a readout light valve that generates projection image light is performed with light.

  2. Description of the Related Art There is known a projection display apparatus in which image writing to a readout light valve that generates projection image light is performed with light (see Patent Document 1 and Patent Document 2). As an example, FIG. 9 shows a conventional projection display apparatus 100. White light emitted from the white light source 101 is converted into substantially parallel light by a parabolic reflector and guided to the integrator lens 102. The integrator lens 102 is composed of a pair of fly-eye lenses 102a and 102b, and each pair of lenses guides light emitted from the white light source 101 to the entire surface of a readout light valve to be described later. The light passing through the integrator lens 102 is guided to the first dichroic mirror 105 after passing through the polarization conversion device 103 and the condenser lens 104.

  The polarization conversion device 103 is configured by a polarization beam splitter array (hereinafter referred to as a PBS array). The PBS array includes a polarization separation film and a phase difference plate (1 / 2λ plate). Each polarization separation film of the PBS array passes, for example, P-polarized light out of the light from the integrator lens 102, and deflects S-polarized light by 90 °. The S-polarized light whose optical path has been deflected is reflected by the adjacent polarization separation film and emitted as it is. On the other hand, the P-polarized light that has passed through the polarization separation film is converted into S-polarized light by the retardation plate provided on the front side (light emitting side) and emitted. That is, in this case, almost all light is converted into S-polarized light.

  The first dichroic mirror 105 transmits the first color light and reflects the second color light and the third color light. The first color light transmitted through the first dichroic mirror 105 is reflected by the tilt mirror 106. The first color light reflected by the tilting mirror 106 is guided to the transmissive read light valve 131 for the first color light through the lens 107. The first color image light is generated by the first color light passing through the readout light valve 131. On the other hand, the light reflected by the first dichroic mirror 105 is guided to the second dichroic mirror 108.

  The second dichroic mirror 108 transmits the third color light, while reflecting the second color light. The second color light reflected by the second dichroic mirror 108 is guided through the lens 109 to the transmissive read light valve 132 for the second color light. The second color light is transmitted through the reading light valve 132 to generate second color image light.

  A first dichroic cube 112 is provided at a position where the optical path of the first color image light and the optical path of the second color image light intersect. The first dichroic cube 112 transmits the first color light and reflects the second color light. When the first color image light and the second color image light are incident on the first dichroic cube 112, the first color image light and the second color image light are guided in the same direction.

  The third color light transmitted through the second dichroic mirror 108 is guided to the transmissive read light valve 133 for the third color light through the lens 110. The third color light is transmitted through the readout light valve 133 to generate third color image light. The optical path of the third color image light is deflected by 90 ° by the reflecting prism 111.

  A second dichroic cube 113 is provided at a position where the optical path of the third color image light deflected by the optical path intersects with the combined optical path of the first color image light and the second color image light. The second dichroic cube 113 transmits the first color light and the second color light and reflects the third color light. When the first color image light, the second color image light, and the third color image light are incident on the second dichroic cube 113, the image light is guided in the same direction, and as a result, full color image light is generated.

  A projection lens 114 is provided on the light emitting side of the second dichroic cube 113 (near the surface from which the full-color image light is emitted). The full color image light emitted from the second dichroic cube 113 is projected onto a screen (not shown) by the projection lens 114.

  Next, the image writing optical system will be described. The image writing optical system includes three ultraviolet LEDs (light emitting diodes) 121A, 121B, and 121C as light sources for image writing. The peak wavelengths of the ultraviolet LEDs 121A, 121B, and 121C are different from each other. Ultraviolet light emitted from the ultraviolet LEDs 121A, 121B, and 121C is synthesized by the dichroic mirrors 120A and 120B (guided in the same direction). When the synthesized ultraviolet light passes through the rod-shaped rod integrator 122, a surface light source having a uniform light intensity is formed on the light exit surface of the rod integrator 122. The ultraviolet light emitted from the light exit surface passes through the relay lens group 123 and is guided to the polarization beam splitter 124.

  The specific polarized light (for example, P-polarized light) transmitted through the polarization beam splitter 124 is irradiated to a writing light valve (LCOS device) 125 that modulates writing light (the ultraviolet light). The write light valve 125 forms an image in a time division manner by a driver (not shown). That is, the driver writes the first image based on the first color video signal, the second image based on the second color video signal, and the third image based on the third color video signal in a time-sharing manner. The light valve 125 is executed.

  Next, the image writing optical system will be described. Three ultraviolet LEDs (light emitting diodes) 121A, 121B, and 121C are provided as light sources for image writing for each color. The peak wavelengths of the ultraviolet LEDs 121A, 121B, and 121C are different from each other. The ultraviolet LEDs 121A, 121B, and 121C are sequentially turned on for a predetermined time. Ultraviolet light emitted from the ultraviolet LEDs 121A, 121B, and 121C is guided in the same direction by the dichroic mirrors 120A and 120B. When the ultraviolet light passes through the rod integrator 122, a surface light source having a uniform light intensity is formed on the light exit surface of the rod integrator 122. The ultraviolet light emitted from the light exit surface passes through the relay lens group 123 and is guided to the polarization beam splitter 124.

  The specific polarized light (for example, P-polarized light) transmitted through the polarization beam splitter 124 is irradiated to a writing light valve (LCOS device) 125 that modulates writing light (the ultraviolet light). The write light valve 125 forms an image for each color in a time division manner by a driver (not shown). That is, for example, the driver causes the write light valve 125 to form the first image based on the first color video signal when the ultraviolet light LED 121A is lit, and the second color video when the ultraviolet light LED 121B is lit. The writing light valve 125 executes the formation of the second image based on the signal, and causes the writing light valve 125 to form the third image based on the third color video signal when the ultraviolet LED 121C is turned on.

  The write light valve 125 generates image light by modulating the received specific polarized light. The image light is obtained as reflected light, and this reflected light is converted into other specific polarized light (for example, S-polarized light). That is, when the writing light valve 125 is irradiated with the specific polarized light, other specific polarized writing image light (S-polarized light) is generated. The writing image light emitted from the writing light valve 125 is reflected by the polarization beam splitter 124. The written image light is guided to the second dichroic cube 113 by the imaging lens group 126.

  The second dichroic cube 113 and the first dichroic cube 112 have wavelength selectivity with respect to the ultraviolet light from the ultraviolet LEDs 121A, 121B, and 121C. Three ultraviolet lights having different peak wavelengths are dispersed, and one ultraviolet light (write image light) is guided to each of the read light valves 131, 132, and 133. Specifically, the first write image light based on the first color video signal is irradiated to the read light valve 131, and the second write image light based on the second color video signal is irradiated to the read light valve 132. The third writing image light based on the third color video signal is applied to the reading light valve 133.

  The reading light valves 131, 132, and 133 are made of, for example, an OASLM (Optically Addressed Spatial Light Modulator) having a photoconductive effect, as described in Patent Document 1. For example, in a structure in which a liquid crystal layer is provided between transparent electrode structures having a photoconductive effect, the photoconductive property changes only at a location where light is received, and the voltage application state to the liquid crystal changes at this light receiving location. The turning state of the liquid crystal can be changed.

Conventionally, a lens shift mechanism for shifting a projected image position without moving the apparatus main body is known. FIG. 8 shows a lens shift mechanism 200 with a bearing as an example (see Patent Document 3).
WO2005 / 116719 JP 2003-78842 A Japanese Patent No. 3634817

  However, a lens shift mechanism that shifts the projection lens requires a motor having high rigidity and high power. Therefore, the projection display apparatus is increased in size, weight, and cost.

  In view of the above circumstances, the present invention is a projection display apparatus in which image writing to a light valve that generates projection image light is performed with light, in order to shift the projection image without moving the apparatus main body. It is an object to realize this mechanism without incurring an increase in size, weight, and cost.

  In order to solve the above problems, a projection display apparatus according to the present invention includes a writing light valve that modulates writing light, a driver that writes an image to the writing light valve based on image data, and the writing An image is written with the writing image light emitted from the built-in light valve, and each color light for projection that is received is modulated to generate each color image light, and each color reading light valve is emitted from the writing light valve. A writing optical system for irradiating each reading light valve with the writing image light, means for synthesizing each color image light emitted from each reading light valve, a projection optical system for projecting each synthesized color image light, And a shift mechanism that shifts the writing light valve or the writing optical system up and down and / or left and right within a plane perpendicular to the image writing optical axis.

  In addition, the projection display apparatus of the present invention emits a writing light valve that modulates writing light, a driver that writes an image to the writing light valve based on image data, and the writing light valve. An image is written with the writing image light, and each reading color light received is modulated to generate each color image light, and the writing image light emitted from the writing light valve is read out. A writing optical system for irradiating the light valve; and a projection optical system for projecting image light emitted from the reading light valve; and the writing light valve or the writing optical system as an image writing optical axis. A shift mechanism for shifting up and down and / or right and left within a vertical plane is provided.

  With these configurations, the writing light valve or the writing optical system is shifted up and down and / or left and right within a plane perpendicular to the image writing optical axis, so that the projected image can be displayed without moving the apparatus main body. A mechanism for shifting can be realized without incurring an increase in size, weight, and cost.

  In addition, the projection display apparatus of the present invention emits a writing light valve that modulates writing light, a driver that writes an image to the writing light valve based on image data, and the writing light valve. An image is written with writing image light, and each color light for projection received is modulated to generate each color image light, and each writing image light emitted from the writing light valve A writing optical system for irradiating the reading light valve, a means for synthesizing each color image light emitted from each reading light valve, a projection optical system for projecting each synthesized color image light, and a signal indicating the shift are operated by the user. And the driver adjusts the position of the image for each color to be written to the write light valve based on the signal indicating the shift. I am characterized in.

  In addition, the projection display apparatus of the present invention emits a writing light valve that modulates writing light, a driver that writes an image to the writing light valve based on image data, and the writing light valve. An image is written with the writing image light, and each reading color light received is modulated to generate each color image light, and the writing image light emitted from the writing light valve is read out. A writing optical system for irradiating the light valve, a projection optical system for projecting image light emitted from the reading light valve, and a shift instruction operation unit for inputting a signal indicating a shift by a user operation, The driver adjusts the position of the image for each color written to the write light valve based on the signal indicating the shift.

  With these configurations, the driver adjusts the position of the image for each color written to the writing light valve based on the signal indicating the shift, so that the projected image is shifted without moving the apparatus main body. Therefore, it is possible to realize a mechanism for increasing the size, weight, and cost.

  According to the present invention, in the projection display apparatus in which image writing to the readout light valve that generates projection image light is performed with light, a mechanism for shifting the projection image without moving the apparatus main body is provided. There are various effects such as simplification as compared with the prior art.

  Hereinafter, a projection display apparatus (projector) according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an optical system of a projection display apparatus 50 according to this embodiment. White light emitted from the white light source 1 is converted into substantially parallel light by the parabolic reflector and guided to the integrator lens 2. The integrator lens 2 is composed of a pair of fly-eye lenses 2a and 2b, and each lens pair guides light emitted from the white light source 1 to the entire surface of a read light valve to be described later. The light passing through the integrator lens 2 is guided to the first dichroic mirror 5 after passing through the polarization conversion device 3 and the condenser lens 4.

  The polarization conversion device 3 is configured by a polarization beam splitter array (hereinafter referred to as a PBS array). The PBS array includes a polarization separation film and a phase difference plate (1 / 2λ plate). Each polarization separation film of the PBS array passes, for example, P-polarized light out of the light from the integrator lens 2 and deflects S-polarized light by 90 °. The S-polarized light whose optical path has been deflected is reflected by the adjacent polarization separation film and emitted as it is. On the other hand, the P-polarized light that has passed through the polarization separation film is converted into S-polarized light by the retardation plate provided on the front side (light emitting side) and emitted. That is, in this case, almost all light is converted into S-polarized light.

  The first dichroic mirror 5 transmits blue light and reflects green light and red light. The blue light transmitted through the first dichroic mirror 5 is reflected by the tilt mirror 6. The blue light reflected by the tilt mirror 6 is guided to the blue light transmission type read light valve 31 through the lens 7. Blue light is transmitted through the read light valve 31 to generate blue image light. On the other hand, the light reflected by the first dichroic mirror 5 is guided to the second dichroic mirror 8.

  The second dichroic mirror 8 transmits red light while reflecting green light. The green light reflected by the second dichroic mirror 8 is guided through the lens 9 to the transmissive read light valve 32 for green light. The green image light is generated by the green light passing through the readout light valve 32.

  A first dichroic cube 12 is provided at a position where the optical path of the blue image light and the optical path of the green image light intersect. The first dichroic cube 12 transmits blue light and reflects green light. When the blue image light and the green image light are incident on the first dichroic cube 12, the blue image light and the green image light are guided in the same direction, and cyan image light is generated.

  The red light transmitted through the second dichroic mirror 8 is guided to the transmissive read light valve 33 for red light through the lens 10. Red image light is generated by the red light passing through the readout light valve 33. The optical path of the red image light is deflected by 90 ° by the reflecting prism 11.

  A second dichroic cube 13 is provided at a position where the optical path deflected red image light and the light path of the cyan image light intersect. The second dichroic cube 13 transmits blue light and green light and reflects red light. When the cyan image light and the red image light are incident on the second dichroic cube 13, the cyan image light and the red image light are guided in the same direction, and as a result, full color image light is generated.

  A projection lens 14 is provided on the light emitting side of the second dichroic cube 13 (near the surface from which the full-color image light is emitted). The full-color image light emitted from the second dichroic cube 13 is projected onto the screen by the projection lens 14.

  Next, the image writing optical system will be described. The image writing optical system includes three ultraviolet LEDs (light emitting diodes) 21A, 21B, and 21C as light sources for image writing for each color. The peak wavelengths of the ultraviolet LEDs 21A, 21B, and 21C are different from each other (λ1> λ2> λ3). The ultraviolet LEDs 21A, 21B, and 21C are turned on sequentially for a predetermined time. Ultraviolet light emitted from the ultraviolet LEDs 21A, 21B, and 21C is guided in the same direction by the dichroic mirrors 20A and 20B. When the ultraviolet light passes through the rod integrator 22, a surface light source having a uniform light intensity is formed on the light exit surface of the rod integrator 22. The ultraviolet light emitted from the light exit surface passes through the relay lens group 23 and is guided to the polarization beam splitter 24.

  The specific polarized light (for example, P-polarized light) transmitted through the polarization beam splitter 24 is irradiated to a writing light valve (LCOS device) 25 that modulates writing light (the ultraviolet light). The write light valve 25 forms an image for each color in a time division manner by a driver (not shown). That is, for example, the driver causes the write light valve 25 to form the first image based on the blue video signal when the ultraviolet LED 21A is lit, and the first based on the green video signal when the ultraviolet LED 21B is lit. The write light valve 25 is caused to execute two image formation, and the write light valve 25 is caused to form a third image based on the red video signal when the ultraviolet LED 21C is lit.

  The writing light valve 25 generates image light by modulating the received specific polarized light. The image light is obtained as reflected light, and this reflected light is converted into other specific polarized light (for example, S-polarized light). That is, when the writing light valve 25 is irradiated with the specific polarized light, other specific polarized writing image light (S-polarized light) is generated. The writing image light emitted from the writing light valve 25 is reflected by the polarization beam splitter 24. The writing image light is guided to the second dichroic cube 13 by the imaging lens group 26.

  The second dichroic cube 13 and the first dichroic cube 12 have wavelength selectivity with respect to the ultraviolet light from the ultraviolet LEDs 21A, 21B, and 21C. Accordingly, the three ultraviolet lights having different peak wavelengths are dispersed, and each readout light valve 31, 32, 33 is irradiated with one ultraviolet light (write image light). Specifically, the first write image light based on the blue video signal is irradiated to the read light valve 31, and the second write image light based on the green video signal is irradiated to the read light valve 32, and the red video signal The third writing image light based on is irradiated to the reading light valve 33.

  As described in Patent Document 1, the read light valves 31, 32, and 33 are made of, for example, an OASLM (Optically Addressed Spatial Light Modulator) having a photoconductive effect. For example, in the case of a structure in which a liquid crystal layer is provided between transparent electrode structures having a photoconductive effect, the photoconductive characteristics change only at the location where light is received, and the voltage application state to the liquid crystal changes at this light receiving location. The turning state of the liquid crystal can be changed. In the read light valves 31, 32, and 33, so-called pixel electrodes are unnecessary, and it can be said that the pixels in the read light valve are generated when optical writing is performed. In the present invention, in consideration of the fact that the write light valve 25 is shifted, the read light valves 31, 32, 33 are formed large so as to receive the optically written image within the range of the shift. As described above, in the read light valves 31, 32, and 33, so-called pixel electrodes are not necessary, and the cost is not increased even when the read light valves are enlarged.

  FIG. 2 is an explanatory diagram showing the optical path change when the writing light valve 25 is shifted on a simplified optical system. When the write light valve 25 is shifted, the position of the write image light is shifted in a common direction on all the read light valves 31, 32, 33 according to the shift amount. When the writing image light is shifted, the projected image on the screen is also shifted. As wiring for supplying a drive signal to the write light valve 25, flexible wiring is used in view of the fact that the write light valve 25 is shifted.

  FIG. 3 is an explanatory diagram showing the optical path change when the imaging lens group 26 is shifted on a simplified optical system. When the imaging lens group 26 is shifted, the position of the writing image light is shifted in a common direction on all the read light valves 31, 32, 33 in accordance with the shift amount. When the writing image light is shifted, the projected image on the screen is shifted.

  When the configuration of FIG. 2 described above is employed, the size of the write light valve 25 is sufficiently larger than the irradiation range of the write light (UV light), that is, the surface of the polarization beam splitter 26, as shown in FIG. To be made smaller. The write light valve 25 can receive the write light at any position where the write light valve 25 moves.

  As a light valve shift mechanism for shifting the write light valve 25, for example, a lens shift mechanism disclosed in Japanese Patent Application Laid-Open No. 2004-245958 can be used. Specifically, as shown in FIGS. 5A and 5B, the light valve shift mechanism of this embodiment includes a first fixed side plate material 311, a second fixed side plate material 312, a light valve holder 313, Drive mechanism 314A * 314B is provided. The second fixed side plate material 312 is fixed with the outer surface serving as a reference surface abutting against the chassis of the projector. The write light valve 25 is fixed to the light valve holder 313. The light valve holder 313 is sandwiched between the first fixed side plate material 311 and the second fixed side plate material 312 and is guided by these to move in the vertical and horizontal directions. Both inner surfaces of the light valve holder 313 and the inner surfaces of the first fixed side plate member 311 and the second fixed side plate member 312 facing these surfaces form sliding surfaces. The first fixed side plate material 311 and the second fixed side plate material 312 are formed with rectangular through holes having a size corresponding to the allowable movement range of the write light valve 25. Further, openings corresponding to the pair of pinions 441 and 441 in the driving mechanism portions 314A and 314B are formed in the second fixed side plate material 312. The light valve holder 313 is engaged with the pair of pinions 441 and 441. Racks 313a and 313a are formed. The widths of the racks 313a and 313a are set in consideration of the allowable movement range of the write light valve 25 and the tooth width of the pinion 441. The pinions 441 and 441 are fixed to a rotating shaft 445. The rotation shaft 445 is rotatably supported by a bearing 312c provided on the surface of the second fixed side plate material 312.

  A support portion 312 a is formed at the edge of the second fixed side plate material 312. A support hole 312b is formed in the support portion 312a in parallel with the surface of the second fixed side plate 312. The adjustment dial 442 of the drive mechanism portions 314A and 314B is inserted into the support hole 312b. The adjustment dial 442 includes a worm gear portion 442a and a knob portion 442b provided on the head side of the worm gear portion 442a. An E-ring 443 is engaged with the body portion of the worm gear portion 442a so that the adjustment dial 442 does not fall off. The worm wheel 444 is screwed into the worm gear region of the worm gear portion 442a. The worm wheel 444 is fixed to the center side of the rotating shaft.

  When the adjustment dial 442 of the drive mechanism unit 314A is turned, the worm gear unit 442a rotates and the worm wheel 444 rotates. As the worm wheel 444 rotates, the rotating shaft 445 rotates and the pinions 441 and 441 rotate. Then, the rotational force of the pinions 441 and 441 is transmitted to the racks 313a and 313a, and the light valve holder 313 moves in the CD direction. Since the unevenness of the racks 313a and 313a on the drive mechanism portion 314B side is present in the CD direction, the light valve holder 313 is allowed to move in the CD direction and exhibits a guide function. Similarly, by turning the adjustment dial 442 of the drive mechanism unit 314B, the worm gear unit 442a rotates and the worm wheel 444 rotates. As the worm wheel 444 rotates, the rotating shaft 445 rotates and the pinions 441 and 441 rotate. Then, the rotational force of the pinions 441 and 441 is transmitted to the racks 313a and 313a, and the light valve holder 313 moves in the EF direction. Since the unevenness of the racks 313a and 313a on the drive mechanism portion 314A side is present in the EF direction, the light valve holder 313 is allowed to move in the EF direction and exhibits a guide function.

  In the light valve shift mechanism described above, the front surface of the second fixed side plate material 312 serving as the reference surface is fixed to the chassis of the projector. However, the present invention is not limited to such a configuration. The back surface of the first fixed side plate 311 serving as a reference surface may be brought into contact with the surface of the polarization beam splitter 24. According to this, the positional relationship between the polarization beam splitter 24 and the writing light valve 25 is properly maintained. Is done. In the light valve shift mechanism described above, the adjustment dial 442 is provided to enable manual shift. However, the present invention is not limited to this. The worm gear portion 442a may be rotated by an electric actuator using a motor or the like. The electric actuator is turned ON / OFF by a switch operation on the operation panel.

  A configuration similar to the configuration shown in FIG. 5 can also be adopted for the mechanism for shifting the imaging lens group 26. However, since manual operation with the adjustment dial 442 is not easy, the worm gear portion 442a is rotated by an electric actuator using a motor or the like.

  In the above example, the write light valve 25 is shifted, but the present invention is not limited to this. As shown in FIG. 6, a write light valve 25A may be provided, and the position of an image written to the write light valve 25A may be shifted. The write light valve 25A is larger than the write light valve 25. For example, if the number of pixels of the write light valve 25 is 1024 × 768, the write light valve 25A has a number of pixels of 2048 × 1536. The projection display apparatus is provided with a shift instruction operation unit through which a signal indicating a shift is input by a user operation. The shift instruction operation unit includes, for example, an up / down adjustment volume, a left / right adjustment volume, and a processing unit that obtains a resistance value (voltage value) of these volumes and generates an up / down / left / right adjustment value. Become. Alternatively, it includes a direction instruction key provided on the remote controller and a processing unit that receives a signal when the key is operated and increases or decreases the adjustment value.

  The driver shifts the position of the writing image to the writing light valve based on the up / down / left / right adjustment values. For example, when the vertical / horizontal adjustment value is (384, 512), the driver writes an image at the center position of the write light valve 25A in the vertical / horizontal direction. The driver shifts the image writing position upward by one pixel when the vertical / horizontal adjustment value is (385, 512), and when the vertical / horizontal adjustment value is (383, 512), The image writing position is shifted downward by one pixel. The driver shifts the image writing position to the right by one pixel when the vertical / horizontal adjustment value becomes (384, 513), and when the vertical / horizontal adjustment value becomes (384, 512), The image writing position is shifted leftward by one pixel.

  Note that the optical system shown in FIG. 1 is an example, and for example, a structure in which three ultraviolet lights having different wavelengths can be switched and emitted by one ultraviolet LED can be used (FIGS. 16A, 17A, and FIG. 17B). If the optical paths of the three color light writing lights are equivalent to each other, the movement of one writing light valve 25 is a movement in a common direction in the three optical writing images. When the optical paths of the writing light are not equivalent to each other, for example, when image inversion occurs because the relay lens optical system exists only in one optical path (see FIG. 15 of Patent Document 1), a light valve shift mechanism is provided. The configuration is not applicable. On the other hand, the configuration for shifting the image writing position of the writing light valve 25A can, for example, make the blue image writing shift direction opposite to the shift direction of the image writing for other colors. Therefore, the present invention can also be applied when the above-described image inversion occurs.

  FIG. 7 is an explanatory view showing a single-plate type projection display apparatus. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. This projection display apparatus includes a red LED 1R, a green LED 1G, and a blue LED 1R as light sources. These LEDs 1R, 1G, and 1B are sequentially turned on in a time division manner. The color light emitted from each LED enters the taper type rod integrator 27. When each color light passes through the rod integrator 27, a surface light source having a uniform light intensity and a reduced light dispersion angle is formed on the light exit surface of the rod integrator 27. Each color light emitted from the light exit surface passes through the reading light valve 34 and is guided to the dichroic cube 28. The dichroic cube 28 reflects ultraviolet light and transmits visible light. A polarizing beam splitter can be used instead of the dichroic cube 28 (in this case, the light exit side polarizing plate of the reading light valve 34 is unnecessary). The writing optical system is substantially the same as the configuration shown in FIG. 1, but it is sufficient to use one ultraviolet LED 21D. In the single-plate type projection display shown in FIG. 7, for example, image writing for red light → red LED 1R lighting → green light image writing → green LED 1G lighting → blue light image writing → Image projection is performed in the cycle of lighting the blue LED 1B.

  In such a single-plate projection display apparatus, a shift mechanism for shifting the writing light valve 25 or a shifting mechanism for shifting the imaging lens group 26 (writing optical system) can be provided. Also, a writing light valve 25A can be provided to shift the image writing position.

  Note that the single-plate projection display apparatus is not limited to the configuration shown in FIG.

  Also in the three-plate projection display apparatus, a solid light emitting element such as a white LED or each color LED can be used in place of the light source 1.

It is explanatory drawing which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is a figure which shows embodiment of this invention, Comprising: It is explanatory drawing which showed the optical path change when a writing light valve was shifted on the simplified optical system. It is a figure which shows embodiment of this invention, Comprising: It is explanatory drawing which showed the optical path change when an imaging lens group was shifted on the simplified optical system. 1 is a perspective view showing a writing optical system, showing an embodiment of the present invention. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows embodiment of this invention, Comprising: The figure (a) is sectional drawing which showed the shift mechanism of the write light valve, The figure (b) is the front view. 1 is a perspective view showing a writing optical system, showing an embodiment of the present invention. FIG. It is explanatory drawing which showed the optical system of the single plate type projection type video display apparatus of embodiment of this invention. It is the perspective view which showed the lens shift mechanism. It is explanatory drawing which showed the optical system of the conventional projection type video display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 12 1st dichroic cube 13 2nd dichroic cube 14 Projection lens 21A, 21B, 21C UV light LED
25 Write Light Valve (LCOS)
26 Imaging lens group 31, 32, 33 Reading light valve

Claims (4)

A write light valve that modulates the write light, a driver that writes an image to the write light valve based on image data, and an image that is written and received by the write image light emitted from the write light valve A read light valve for each color that modulates each color light for projection to generate each color image light, and a write optical system that irradiates each read light valve with the write image light emitted from the write light valve; Means for synthesizing each color image light emitted from each reading light valve, and a projection optical system for projecting each synthesized color image light, and the writing light valve or the writing optical system is image writing light A projection-type image display apparatus comprising a shift mechanism for shifting up and down and / or left and right within a plane perpendicular to an axis. A write light valve that modulates the write light, a driver that writes an image to the write light valve based on image data, and an image that is written and received by the write image light emitted from the write light valve One reading light valve that modulates each color light for projection to generate each color image light, a writing optical system that irradiates the reading light valve with writing image light emitted from the writing light valve, and A projection optical system for projecting image light emitted from the reading light valve, and the writing light valve or the writing optical system is shifted up and down and / or left and right within a plane perpendicular to the image writing optical axis. A projection-type image display device comprising a shift mechanism. A write light valve that modulates the write light, a driver that writes an image to the write light valve based on image data, and an image that is written and received by the write image light emitted from the write light valve A read light valve for each color that modulates each color light for projection to generate each color image light, and a write optical system that irradiates each read light valve with the write image light emitted from the write light valve; Means for synthesizing each color image light emitted from each readout light valve, a projection optical system for projecting each synthesized color image light, and a shift instruction operation unit for inputting a signal indicating a shift by a user operation And the driver adjusts the position of the image for each color written to the writing light valve based on the signal indicating the shift. A write light valve that modulates the write light, a driver that writes an image to the write light valve based on image data, and an image that is written and received by the write image light emitted from the write light valve One reading light valve that modulates each color light for projection to generate each color image light, a writing optical system that irradiates the reading light valve with writing image light emitted from the writing light valve, and A projection optical system that projects image light emitted from the read light valve; and a shift instruction operation unit that receives a signal indicating a shift by a user operation, and the driver is based on the signal indicating the shift, A projection-type image display apparatus that adjusts the position of an image for each color to be written to the writing light valve.

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