JP2006153918A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus capable of easily displaying an image whose definition is higher than the resolution of a spatial optical modulation element in use. <P>SOLUTION: The image is displayed with light having a specified polarized state by an original image display part 10. The light emitted from respective pixels constituting one image in the spatial optical modulation element 23 is spatially separated by a polarization control part 11 into two kinds of light, that is, the 1st polarized light 41 and the 2nd polarized light 42 having different polarized states at a ratio of nearly 50:50. The 1st polarized light 41 and the 2nd polarized light 42 advance in the same ongoing direction with a slight shift in a polarized light separating part 12. A selective emitting part 13 is arranged in the optical paths of the 1st polarized light 41 and the 2nd polarized light 42 emitted from the part 12 so as to selectively and alternatively emit the 1st polarized light 41 and the 2nd polarized light 42 in a time division manner. The 1st polarized light 41 and the 2nd polarized light 42 are separately projected and imaged on a screen 15 by a projecting part 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display apparatus that displays an image having a higher resolution than the original image display element.

  In an image display apparatus such as a projector apparatus that displays an image using a spatial light modulation element in which a large number of pixels are two-dimensionally arranged, it is desired to display a high-definition image more easily. In order to display a high-definition image using a spatial light modulation element with a fixed number of pixels, there is a method in which the pixel size is physically reduced to increase the number of pixels. However, each pixel including an electric circuit is precisely manufactured using a semiconductor manufacturing technique, and there is a limit to the reduction of the pixel depending on the capability and cost of the semiconductor manufacturing technique.

  Patent Document 1 discloses a liquid crystal display panel in which light emitted from a liquid crystal display panel is shifted by a wobbling element using a liquid crystal display panel, a liquid crystal element, and a birefringent plate, and the number of pixels is fixed. There has been proposed an image display device that displays a high-definition image by periodically shifting the optical path of light emitted from the light source and increasing the number of apparent pixels.

  In Patent Document 1, since the shift amount of the wobbling element depends on the polarization separation angle between the ordinary light and the extraordinary light of the birefringent plate and the thickness of the birefringent plate, the parallelism, flatness, and fabrication accuracy of the birefringent plate. However, it affects the uniformity of the shift amount over the entire screen. If the production accuracy of the birefringent plate is poor, the shift amount on the entire surface of the screen becomes non-uniform, and the finally displayed image is deteriorated. On the other hand, it is expensive to produce with high accuracy. Further, in Patent Document 1, since the polarization state is changed by electrically controlling the birefringent plate so that the light emitted from each pixel takes only one optical path, the control of the wobbling element becomes complicated.

JP 2003-185974 A

  An object of the present invention is to provide an image display device that can easily display an image having a higher definition than the resolution of a spatial light modulator to be used.

  The first image display device of the present invention comprises an original image display means, a polarization control means, a polarization separation means, a selective emission means, and a projection means, and the original image display means emits light of a specific polarization state. The images are sequentially displayed, and the polarization control means converts the light constituting each image emitted from the original image display means into light having first and second polarized lights having different polarization states, and polarization separation is performed. The means separates the optical paths of the first polarized light and the second polarized light by shifting them, and the selective emitting means selects and emits only one of the separated first polarized light and second polarized light, and projects The means forms an image of the separated first polarized light and second polarized light.

  A second image display device of the present invention comprises an original image display means, a polarization control means, a polarization separation means, a selective emission means, and a projection means, and the original image display means emits light of a specific polarization state. The images are sequentially displayed, and the polarization control means converts the light constituting each image emitted from the original image display means into light having first and second polarized lights having different polarization states, and polarization separation is performed. The means separates the first polarized light and the second polarized light by shifting the optical paths, and the selective emitting means transmits the first polarized light transmitting means that transmits the separated first polarized light, and the separated second polarized light. A second polarized light transmitting unit that transmits light, and the projection unit forms an image of the separated first polarized light and second polarized light.

  The polarization separation means may have a polarization beam splitter. The first polarized light and the second polarized light may be linearly polarized light. The polarization control unit may spatially divide the light emitted from the original image display unit to form the first polarized light and the second polarized light. The polarization control unit may form the first polarized light and the second polarized light by temporally dividing the light emitted from the original image display unit. The amount of deviation between the first polarized light and the second polarized light separated by the polarization separation means is preferably smaller than the pixel pitch in the direction orthogonal to the optical axis. A plurality of polarization control means and polarization separation means may be provided, and the first polarization light and the second polarization light output from the polarization control means and the polarization separation means may be incident on other polarization control means and polarization separation means, respectively. The spatial light modulation element may display an image by reducing each pixel.

  According to the first image display device of the present invention, one image is separated into first polarized light and second polarized light having two different polarization states by the polarization separation means, and selectively emitted by the selective emission unit. Therefore, a mechanism for changing the optical path for each image is not required, and a higher definition image than the original image display means can be displayed with a simple structure. According to the second image display device of the present invention, one image is separated into first polarized light and second polarized light having two different polarization states by the polarization separation means, and selectively emitted by the selective emission unit. Therefore, a mechanism for changing the optical path for each image is not required, and a higher definition image than the original image display means can be displayed with a simple structure.

  Since the polarization separation means has the polarization beam splitter, the image display apparatus can be easily and inexpensively manufactured with a simple optical system. Since the first polarized light and the second polarized light are linearly polarized light, the image display device can be manufactured at a low cost with a simple mechanism. The polarization control means spatially divides the light emitted from the original image display means to form the first polarized light and the second polarized light, thereby constituting the polarization control means with a simple mechanism, and an image display device Can be manufactured easily and at low cost. The polarization control means temporally divides the light emitted from the original image display means to form the first polarized light and the second polarized light, thereby maintaining the light intensity as compared with the case of spatial division. Bright images can be displayed.

  Since the amount of deviation between the first polarized light and the second polarized light separated by the polarization separating means is smaller than the pixel period in the direction perpendicular to the optical axis, an additional pixel is apparently arranged between the pixels of the original image. The image can be displayed with high definition equivalent to A plurality of polarization control means and polarization separation means are provided, and the first polarization light and the second polarization light output from the polarization control means and the polarization separation means are incident on the other polarization control means and the polarization separation means, respectively. The image can be displayed with higher definition by shifting in a plurality of directions. Since the spatial light modulation element reduces each pixel and displays an image, it is possible to reduce the overlap of pixels and display an image with higher definition.

  As shown in the configuration diagram of FIG. 1, the image display device 1 includes an original image display unit 10, a polarization control unit 11, a polarization separation unit 12, a selective emission unit 13, a projection unit 14, a screen 15, and a display control unit 16. For example, a projector device. Note that the light emitted from the original image display unit 10 travels while spreading and forms an image on the screen 15 by the projection unit 14, but is drawn so as to travel linearly in FIG. 1 for convenience of explanation. ing.

  The original image display unit 10 includes a light source 20, a condensing / illumination / polarization conversion optical system 21, a first polarization beam splitter (PBS) 22, and a spatial light modulation element 23, and has a specific polarization state, for example, Images are displayed with linearly polarized light.

  The light source 20 emits white light by a white lamp. The light source 20 may be a halogen lamp, a xenon lamp, a metal halide, an ultrahigh pressure mercury lamp, or the like. The condensing / illuminating / polarization converting optical system 21 polarizes the white light emitted from the light source 20 into linearly polarized light and enters the first polarized beam splitter 22 as S-polarized light. The first polarization beam splitter 22 reflects the S-polarized light incident from the condensing / illumination / polarization conversion optical system 21 side to the spatial light modulation element 23 side, and enters the S-polarized light incident from the spatial light modulation element 23 side. Is reflected to the condensing / illuminating / polarization converting optical system 21 side, and P-polarized light incident from the spatial light modulation element 23 side is transmitted and travels straight.

  The spatial light modulator 23 is composed of a reflective liquid crystal element having a plurality of pixels arranged two-dimensionally in a direction orthogonal to each other, and the polarization direction of light incident on each pixel is controlled by a liquid crystal layer. Reflected by the reflective layer and emitted in the opposite direction. Specifically, as shown in the cross-sectional view of FIG. 2A, the spatial light modulation element 23 is provided between a silicon backplane 31 provided with pixel electrodes 30 corresponding to two-dimensionally arranged pixels and a cover glass 32. The liquid crystal layer 33 is sandwiched between the pixel electrodes 30, and the pixel electrodes 30 are turned on and off to change the alignment of the liquid crystal, so that the light is incident from the cover glass 32 side, reflected by the pixel electrodes, and emitted from the cover glass 32. Control the polarization direction of the light. The light reflected by the pixel with the pixel electrode 30 in the OFF state is incident on the first polarization beam splitter 22 as S-polarized light while maintaining the polarization direction at the time of incidence, so that the light collection / illumination / polarization conversion optical system 21 side Is reflected. The light reflected by the pixel in which the pixel electrode 30 is ON is rotated 90 degrees in the polarization direction and is incident on the first polarizing beam splitter 22 as P-polarized light, and thus passes through the first polarizing beam splitter 22 and travels straight. . The spatial light modulator 23 may be a movable micromirror such as a digital mirror device (DMD) in addition to a transmissive or reflective liquid crystal element using liquid crystal.

  The spatial light modulator 23 has a structure in which a microlens array 34 is provided between a liquid crystal layer 33 and a cover glass 32 and a resin 35 is filled in a gap as shown in the cross-sectional view of FIG. You may have. The light incident from the cover glass 32 side passes through the liquid crystal layer 33 while being condensed by the microlens array 34, is reflected by the pixel electrode 30, and is further condensed by the microlens array 34, and is most concentrated at the condensing point 36. The light is emitted from the cover glass 32 side while diverging after being thinned. By providing the microlens array 34, it is possible to make it appear that light is emitted from a region smaller than the actual pixel at the condensing point 36. The spatial light modulator 23 may be one that collects incident light by forming pixels into a concave mirror instead of a microlens array, or a combination of a microlens and a concave mirror. Good. By making it appear that light is emitted from a region smaller than actual pixels, it is possible to reduce the overlap of adjacent pixels when projecting onto the screen 15 and display a higher definition image.

  The polarization controller 11 converts the light emitted from each pixel constituting one image by the spatial light modulator 23 into two types of light, ie, first polarized light 41 and second polarized light 42 having different polarization states. Divide the space at about 50:50. The intensity of the first polarized light 41 and the intensity of the second polarized light 42 are the same. The polarization controller 11 generates the first polarized light 41 and the second polarized light 42 by space division without being driven electrically or mechanically, so that the polarization control unit 11 has an electrical or mechanical drive part. Durability can be increased.

  For example, as shown in the plan view of FIG. 3A, the polarization control unit 11 transmits the light transmitting material 51 such as optical glass while maintaining the polarization direction of the transmitted light, and the polarization direction of the transmitted light. The λ / 2 plate 52 rotated 90 degrees is arranged in a mosaic pattern with an area ratio of 50:50. As shown in the perspective view of FIG. 3B, the linearly polarized light emitted from the same pixel and transmitted through the first polarizing beam splitter 22 spreads until it enters the polarization control unit 11 and is translucent. The material and the λ / 2 plate are incident on a wide range including approximately 50:50, and part of the light passes through the translucent material while maintaining the polarization direction to become the first polarized light 41, and the other part. The light is rotated by 90 degrees and transmitted through the λ / 2 plate to become the second polarized light 42, so that the light is split into two types of light having different polarization directions at a ratio of approximately 50:50. It should be noted that the pattern formed by the translucent material and the λ / 2 plate may be in another arrangement as long as it is uniformly distributed at 50:50. Note that the angle of the polarization direction of the second polarized light with respect to the polarization direction of the first polarized light is not limited to 90 degrees, and is, for example, 45 degrees by adjusting the slow axis of λ / 2. There may be.

  Note that the polarization controller 11 may emit the first polarized light 41 and the second polarized light 42 with different polarization states. For example, the first polarized light 41 may be clockwise circularly polarized light or elliptically polarized light, For example, the second polarized light 42 may be counterclockwise circularly polarized light or elliptically polarized light. By making the first polarized light 41 and the second polarized light 42 linearly polarized light, the optical system can be simplified and the cost can be reduced.

  As illustrated in FIG. 1, the polarization separation unit 12 includes a second polarization beam splitter 61, a prism 62, and an optical path difference correction unit 63. The second polarization beam splitter 61 separates the first polarization light 41 and the second polarization light 42 by causing the first polarization light 41 to travel straight, reflecting the second polarization light 42 at a right angle and changing the traveling direction. The prism 62 is formed of a prism, a reflecting mirror, or the like, and further reflects the second polarized light 42 reflected by the second polarizing beam splitter 61 at a right angle and travels parallel to the first polarized light 41. The first polarized light 41 and the second polarized light 42 emitted from the polarization separation unit 12 are separated and travel slightly shifted in the same traveling direction. The interval between the first polarized light 41 and the second polarized light 42 is equal to the distance from when the second polarized light 42 is reflected by the second polarized beam splitter 61 until it is reflected by the prism 62. The optical path difference correcting unit 63 is formed of a high refractive index member and is inserted into the path of the first polarized light 41 that has passed through the second polarizing beam splitter 61 to be the optical path difference between the first polarized light 41 and the second polarized light 42. Correct.

  The polarization separation unit 12 includes a second polarization beam splitter 71, a first prism 72, a second prism 73, a third polarization beam splitter 74, and an optical path difference correction unit 75, for example, as shown in FIG. It may be a thing. The second polarization beam splitter 71 separates the first polarization light 41 and the second polarization light 42 by causing the first polarization light 41 to travel straight, reflecting the second polarization light 42 at a right angle and changing the traveling direction. . The first prism 72 further reflects the second polarized light 42 reflected by the second polarizing beam splitter 71 at a right angle and travels in parallel with the first polarized light 41. The second prism 73 further reflects the second polarized light 42 at a right angle to bring it closer to the first polarized light 41. The third polarizing beam splitter 74 advances the first polarized light 41 straight, reflects the second polarized light 42 reflected by the second prism 73 at a right angle, and advances the first polarized light 41 again in parallel with the first polarized light 41. The distance between the first prism 72 and the second prism 73 is slightly smaller than the distance between the second polarization beam splitter 71 and the third polarization beam splitter 74, and the first polarization light 41 is transmitted through the third polarization beam splitter. The position and the transmission of the second polarized light 42 are slightly shifted. The optical path difference correction unit 63 is formed of a high refractive index member, and is inserted into the path of the first polarized light 41 between the second polarized beam splitter 61 and the third polarized beam splitter 74, so that the first polarized light 41 and the first polarized light 41 The optical path difference with the two polarized light 42 is corrected. The polarization separation unit 12 includes the second polarization beam splitter 71, the first prism 72, the optical path difference correction unit 75, the third polarization beam splitter 74, and the second prism 73, so that the first polarization light 41 and the second polarization light are obtained. The optical path with the light 42 can be made closer. The first prism 72 and the second prism 73 may be formed of other reflecting members such as a reflecting mirror.

  Further, as shown in FIG. 4B, for example, the polarization separation unit 12 includes a second polarization beam splitter 81, a first λ / 2 plate 82, a first prism 83, a third polarization beam splitter 84, and a second prism 85. It may have a second λ / 2 plate 86. The first polarized light 41 enters the second polarizing beam splitter 81 as P-polarized light, passes through the second polarizing beam splitter 81, and is rotated in the polarization direction by 90 degrees by the first λ / 2 plate 82. 83 is incident as S-polarized light and reflected at a right angle, and is incident on the third polarizing beam splitter 84 as S-polarized light and is reflected and emitted at a right angle. The second polarized light 42 enters the second polarizing beam splitter 81 as S-polarized light and is reflected at a right angle, and enters the second prism 85 arranged at a slight interval as S-polarized light and is reflected at a right angle. Then, the polarization direction is rotated by 90 degrees by the second λ / 2 plate 86, enters the third polarizing beam splitter 84 as P-polarized light, passes through the third polarizing beam splitter 84, and is emitted. The distance between the first polarized light 41 and the second polarized light 42 emitted from the third polarization beam splitter 84 is equal to the distance between the second polarization beam splitter 81 and the second prism 85. It is preferable that the distance between the second polarization beam splitter 81 and the second prism 85 be within the defocus range of the projection unit 14. The polarization separation unit 12 includes the second polarization beam splitter 81, the first λ / 2 plate 82, the first prism 83, the third polarization beam splitter 84, the second prism 85, and the second λ / 2 plate 86, so that the optical path The optical path difference between the first polarized light 41 and the second polarized light 42 can be adjusted without providing the difference correction unit 75.

  By using a member such as a polarizing beam splitter or a prism without using a birefringent plate for the polarization separation unit 12, it is possible to manufacture an image display device with a simple configuration with high accuracy and small size at low cost. Note that the polarization separation unit 12 may have a laminated structure in which two different members are thinly and alternately deposited, and the polarization separation angle of ordinary light and extraordinary light can be made larger than that of a birefringent plate using a mineral material. The polarization separation unit 12 can be made small.

  The selective emission unit 13 is arranged in the optical path of the first polarized light 41 and the second polarized light 42 emitted from the polarization separation unit 12, and alternately generates the first polarized light 41 and the second polarized light 42 in a time division manner. Selectively transmits. For example, as illustrated in FIG. 5, the selective emission unit 13 includes a first polarized light transmitting unit 91 that transmits the first polarized light 41 and a second polarized light transmitting unit 92 that transmits the second polarized light 42. The first polarized light transmitting portion 91 and the second polarized light transmitting portion 92 are mechanically linearly moved or rotated, and either one of the first polarized light 41 and the second polarized light 42 is routed in a time division manner. By inserting the first polarized light 41 and the second polarized light 42, the first polarized light 41 and the second polarized light 42 are selectively transmitted. By providing the selective emission unit 13, even if light having two optical paths of the first polarized light 41 and the second polarized light 42 is generated in the polarization separation unit 12 with respect to the same image, either one is selectively used. And the configuration of the polarization separation unit 12 can be simplified.

  The projection unit 14 includes a lens disposed between the polarization separation unit 12 and the selective emission unit 13, and projects the first polarized light 41 and the second polarized light 42 onto the screen 15 to form an image. The first polarized light 41 and the second polarized light 42 emitted from the same pixel of the spatial light modulator 23 are projected onto the screen 15 with a distance d separated. In addition, as long as the image by the 1st polarized light 41 and the 2nd polarized light 42 can be projected on the screen 15, you may arrange | position in another position. The smaller the distance between the first polarized light 41 and the second polarized light 42 in the polarization separation unit 12, the smaller the distance d on the screen 15. For example, if the distance d is equal to or smaller than the pixel pitch of the spatial light modulator 23. The image can be displayed with higher definition by partially overlapping the pixels on the screen 15.

  The display control unit 16 divides each finally displayed image into an image A and an image B extracted by skipping one line at a time, and switches on / off each pixel electrode of the spatial light modulator 23. When the image A and the image B are displayed in order and the image A is displayed by the spatial light modulator 23, the first polarized light 41 is transmitted by the selective emission unit 13 and the image B is displayed by the spatial light modulator 23. In this case, the selective emission unit 13 transmits the second polarized light 42.

  When the image A is emitted from the original image display unit 10, the image A is spatially divided into the first polarized light 41 and the second polarized light 42 by the polarization controller 11, and the first polarized light 41 and the first polarized light 41 are separated by the polarization separation unit 12. The optical path with the second polarized light 42 is shifted, and only the first polarized light 41 is selectively transmitted by the selective emission unit 13 and imaged on the screen 15 by the projection unit 14. Next, when the image B is emitted from the original image display unit 10, the image B is spatially divided into the first polarized light 41 and the second polarized light 42 by the polarization control unit 11, and the first polarized light by the polarization separation unit 12. The optical paths of the light 41 and the second polarized light 42 are shifted, and only the second polarized light 42 is selectively transmitted by the selective emission unit 13 and imaged on the screen 15 by the projection unit 14. The irradiation position of the image A displayed using the first polarized light 41 and the image B displayed using the second polarized light 42 is projected to a position shifted by d on the screen 15.

  As shown in the schematic diagram of FIG. 6 in which the optical paths of the image A and the image B emitted from the original image display unit 10 and displayed on the screen 15 are simplified, an image A indicated by a solid line and an image B indicated by a broken line By setting the shift d to half of the interval of the pixels displayed on the screen 15 and setting the switching speed between the image A and the image B to a high speed of 60 Hz or more at which a person does not feel flicker, The image A and the image B can be seen at the same time, and an image having a resolution twice that of the spatial light modulator 23 can be displayed.

  According to the image display device 1, one image is separated into two first polarized light 41 and second polarized light 41 having two different polarization states by the polarization separation unit 12, and this is selectively selected by the selective emission unit 13. Therefore, it is possible to display a high-definition image with a simple structure without requiring a mechanism for changing the optical path for each image.

  As shown in FIG. 7, the selective emission unit 13 includes a first polarized light transmitting unit 91 and a second polarized light transmitting unit 92 arranged side by side in the course of the first polarized light 41 and the second polarized light 42. It may be what you did. For example, the selective emission unit 13 is formed into a glasses type or a contact lens type using a polarizing plate or the like, and the first polarized light 41 transmitted through the first polarized light transmission unit 91 is incident on the right eye of the observer without using the screen 15. Then, by making the second polarized light 42 transmitted through the second polarized light transmitting portion 122 incident on the left eye of the observer, the first polarized light 41 and the second polarized light 42 that form images at different positions allow high definition. The image can be shown to the observer with a simple device. A three-dimensional image can be shown by displaying an image with the angle changed by the spatial light modulator 23. The selective emission part 13 may be formed of a polarizing plate or the like.

  Further, as shown in FIG. 8, the polarization control unit 11 and the polarization separation unit 12 are repeatedly arranged in two stages to transmit the light emitted from the original image display unit 10, thereby polarizing the first polarized light 41. While separating into two polarized light B and polarized light C that are orthogonal in direction, the second polarized light 42 may be separated into two polarized light A and polarized light D that are orthogonal in the polarization direction, The polarization controller 11 and the polarization separator 12 may be repeated in multiple stages to separate into more polarized light. By repeatedly arranging the polarization control unit 11 and the polarization separation unit 12 in multiple stages, the number of pixels of the image projected on the screen 15 can be further increased to easily display a high-definition image.

  In the image display device of the second embodiment, the light emitted from the spatial light modulator 23 is polarized by time division (field sequential) instead of the polarization controller 11 in the image display device 1 of the first embodiment. The polarization controller 100 that emits the first polarized light 41 and the second polarized light 42 in different states is used. For example, as shown in the plan view of FIG. 9A, the polarization control unit 100 using time division includes a translucent material 51 such as optical glass that transmits light while maintaining the polarization direction of the transmitted light, and transmission. As shown in the perspective view of FIG. 9 (b), the λ / 2 plates 52 that rotate the polarization direction of the light to be rotated by 90 ° are alternately arranged in a fan shape with an area ratio of 50:50. A part of the disk is inserted into the optical path of the light emitted from the spatial light modulator 23. The linearly polarized light emitted from the same pixel and transmitted through the first polarizing beam splitter 22 is transmitted while the incident light maintains the polarization direction during the time when the light transmitting material 51 is inserted in the optical path. In the time when λ / 2 is inserted into the optical path through the light-transmitting material, the incident light rotates the polarization direction by 90 degrees to become the second polarized light 42, so that The light of each pixel constituting one image displayed by the light modulation element 23 is changed into two types of light having different polarization directions at a time ratio of 50:50. Note that the polarization controller 100 using time division controls linearly polarized light incident from the spatial light modulator 23 by controlling the alignment direction of the liquid crystal in the liquid crystal layer with voltage as shown in FIG. It may be selected whether the light is transmitted with the polarization direction as it is, or the polarization direction is rotated by 90 degrees and transmitted.

It is a block diagram of an image display apparatus. It is sectional drawing of a spatial light modulation element. It is a block diagram of a polarization control part. It is another block diagram of a polarization separation part. It is a block diagram of a selective emission part. It is a figure which shows the optical path of each image from an original image display part to a screen. It is another block diagram of the selective emission part. It is a block diagram of the part which has arrange | positioned the polarization | polarized-light control part and the polarization separation part in multistage. It is a block diagram of a time-division polarization controller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Image display apparatus, 10; Original image display part, 11; Polarization control part, 12: Polarization separation part,
13; selective emission unit, 14; projection unit, 15; screen, 16; display control unit,
20; light source; 21; condensing / illumination / polarization conversion optical system; 22; first polarization beam splitter;
23; spatial light modulator, 30; pixel electrode, 31; silicon backplane,
32; cover glass, 33; liquid crystal layer, 34; microlens array, 35; resin,
36; condensing point; 41; first polarized light; 42; second polarized light; 51; translucent material;
52; λ / 2 plate, 61; second polarization beam splitter, 62; prism,
63; an optical path difference correction unit, 71; a second polarizing beam splitter, 72; a first prism,
73; second prism, 74; third polarization beam splitter, 75; optical path difference correction unit,
81; second polarization beam splitter; 82; first λ / 2 plate; 83; first prism;
84; third polarizing beam splitter; 85; second prism; 86; second λ / 2 plate;
91; first polarized light transmission unit; 92; second polarized light transmission unit; 100; polarization control unit.

Claims (9)

An original image display means, a polarization control means, a polarization separation means, a selective emission means, and a projection means,
The original image display means emits light of a specific polarization state and sequentially displays images,
The polarization control means converts light constituting each image emitted from the original image display means into light having first and second polarized lights having different polarization states,
The polarized light separating means separates the first polarized light and the second polarized light by shifting optical paths,
The selective emission means sequentially selects and emits the separated first polarized light and second polarized light,
The image display device characterized in that the projection means forms an image of the separated first polarized light and second polarized light. An original image display means, a polarization control means, a polarization separation means, a selective emission means, and a projection means,
The original image display means emits light of a specific polarization state and sequentially displays images,
The polarization control means converts light constituting each image emitted from the original image display means into light having first and second polarized lights having different polarization states,
The polarized light separating means separates the first polarized light and the second polarized light by shifting optical paths,
The selective emission means includes first polarized light transmitting means that transmits the separated first polarized light, and second polarized light transmitting means that transmits the separated second polarized light,
The image display device characterized in that the projection means forms an image of the separated first polarized light and second polarized light.   The image display apparatus according to claim 1, wherein the polarization separation unit includes a polarization beam splitter.   The image display device according to claim 1, wherein the first polarized light and the second polarized light are linearly polarized light.   The image according to any one of claims 1 to 4, wherein the polarization control unit spatially divides light emitted from the original image display unit to form first polarized light and second polarized light. Display device.   5. The image according to claim 1, wherein the polarization control unit divides the light emitted from the original image display unit in time to form first polarized light and second polarized light. Display device.   The amount of deviation between the first polarized light and the second polarized light separated by the polarization separation means is smaller than the pitch of the pixels in a direction orthogonal to the optical axis. Image display device. A plurality of the polarization control means and the polarization separation means,
The first polarized light and the second polarized light output from the polarization control unit and the polarization separation unit are incident on the other polarization control unit and the polarization separation unit, respectively. The image display device described in 1. The image display device according to claim 1, wherein the spatial light modulation element displays an image by reducing each pixel.

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