JP2008256740A - Image display device and display system - Google Patents

Image display device and display system Download PDF

Info

Publication number
JP2008256740A
JP2008256740A JP2007095457A JP2007095457A JP2008256740A JP 2008256740 A JP2008256740 A JP 2008256740A JP 2007095457 A JP2007095457 A JP 2007095457A JP 2007095457 A JP2007095457 A JP 2007095457A JP 2008256740 A JP2008256740 A JP 2008256740A
Authority
JP
Japan
Prior art keywords
image display
display element
light
optical system
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007095457A
Other languages
Japanese (ja)
Inventor
Atsushi Arai
Yasuyuki Haino
Hiroshi Kawai
Masahiro Kawakita
Fumio Okano
Hisayuki Sasaki
Masato Sato
Akinari Suehiro
久幸 佐々木
正人 佐藤
文男 岡野
博史 川井
晃也 末廣
真宏 河北
淳 洗井
泰行 配野
Original Assignee
Nippon Hoso Kyokai <Nhk>
Victor Co Of Japan Ltd
日本ビクター株式会社
日本放送協会
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Hoso Kyokai <Nhk>, Victor Co Of Japan Ltd, 日本ビクター株式会社, 日本放送協会 filed Critical Nippon Hoso Kyokai <Nhk>
Priority to JP2007095457A priority Critical patent/JP2008256740A/en
Publication of JP2008256740A publication Critical patent/JP2008256740A/en
Pending legal-status Critical Current

Links

Images

Abstract

An image display device capable of increasing the resolution without providing an aperture in the vicinity of a liquid crystal layer of an image display element is provided.
An image or an aperture pattern is imaged at a portion other than the image display element portion, and a pixel and an aperture of the image display element are associated with each other on the image formation surface. In other words, the image display device includes an image display element in which pixels are arranged in an array, an image forming optical system that forms an image of readout light from the image display element, and an image forming surface of an image formed by the image forming optical system. And an aperture array (or polarizer array) in which at least one aperture (or polarizer) is arranged with respect to the pixel on the imaging plane.
[Selection] Figure 1

Description

  The present invention relates to an image display device and a display system. In particular, the present invention relates to a projection-type image display device and a display system suitable for increasing the resolution.

In recent years, high-definition video technology with a sense of realism has rapidly spread, and high-definition video display exceeding high-vision is being realized. At present, the projection display is the most promising method for displaying high-definition images. In particular, an ultra-high-definition display system using a reflective LCoS having a fine pixel structure and a large aperture ratio is being developed as a next-generation video technology (see Non-Patent Document 1).
In this method, a technique for improving the resolution of an image by using two green image panels and shifting the display by half a pixel is used. In the future, in addition to high-definition technology by miniaturizing display pixels, high-resolution video display technology by shifting pixels will be an effective means for the realization of future high-definition television and the development of stereoscopic video display technology based on these technologies. It will become.
M. Kanazawa, K. Hamada, I. Kondoh, F. Okano, Y. Haino, M. Sato, K. Doi, "An ultrahigh-definition display using the pixel-offset method", Journal of the Society for Information Display, vol.12, no.1,2004, p.93-103

  However, in order to achieve higher definition, it is necessary to improve the accuracy of the pixel shift display method. The problem of the pixel shifting method is as follows. That is, since the aperture ratio of the LCoS element is almost 100%, when the two green images are shifted by half a pixel, the pixels of the two green images are displayed overlapping each other, so that the resolution is increased. Have disadvantageous characteristics.

In order to solve this, it is conceivable to install an aperture in the vicinity of the liquid crystal layer of the image display element as a simple means. However, it is very expensive to install the aperture in the element manufacturing process, and the aperture It is expected to cause many causes of image quality degradation of the display image, such as generation of stray light due to generation of diffracted light and reflected light due to light, and influence of temperature dependence of liquid crystal modulation characteristics due to heat absorption.
Furthermore, by forming an aperture in the opposing glass substrate that sandwiches the liquid crystal layer, irregularities are generated on the surface, which affects the liquid crystal alignment film characteristics. For the above reasons, it is not realistic to make an aperture on the pixel display surface.

  The present invention has been made based on the above problem recognition, and an object thereof is to provide an image display device capable of achieving high resolution without providing an aperture near the liquid crystal layer of the image display element. . Another object of the present invention is to make it possible to display a stereoscopic image as an application of such an image display device.

Therefore, in the present invention, in order to solve the above-described problems, as a technical feature, an image or an aperture pattern is formed at an area other than the image display element portion, and the pixels and the aperture of the image display element are associated with the image formation plane. It is set as the structure made to do.
That is, instead of directly setting an aperture on the image display element, an image of the display element is formed once by a relay lens, and an aperture stop is set on the image plane. Alternatively, by installing an aperture stop in the illumination optical system, high-resolution image display performance by shifting pixels is improved without causing a reduction in image quality of the projected image. Further, the use efficiency of light can be increased by using a polarizer array instead of the aperture array. Furthermore, by combining the lens array, it is possible to display an integral 3D image.
In addition, although the code | symbol attached | subjected to description of each aspect of the following solution means is for referring embodiment, it does not limit the interpretation of a solution means.

[1] In order to solve the above problems, an image display device according to an aspect of the present invention forms an image of an image display element (12) having pixels arranged in an array and readout light from the image display element. An imaging optical system (14), and an aperture array (15) provided on an imaging plane of an image by the imaging optical system, wherein at least one aperture is arranged for the pixel on the imaging plane Are provided.
Here, the image display element may be a reflection type or a transmission type. The aperture is arranged corresponding to the pixel. According to this configuration, the aperture array is provided at a location away from the image display element. Since the aperture corresponding to the pixel is provided on the imaging surface of the readout light from the image display element, high resolution can be achieved.

[2] An image display apparatus according to an aspect of the present invention includes an image display element (20, 21) in which pixels are arranged in an array, and an imaging optical system that forms an image of readout light from the image display element. (23) and a polarizer array (24) provided on an image forming surface of an image by the image forming optical system, wherein at least one polarizer is arranged for the pixel on the image forming surface. It is characterized by comprising.
Here, the image display element may be a reflection type or a transmission type. Further, the polarizer is arranged corresponding to the pixel. According to this configuration, the polarizer is provided at a location away from the image display element. Further, since the polarizer corresponding to the pixel is provided on the imaging surface of the readout light from the image display element, high resolution can be achieved.

[3] An image display apparatus according to an aspect of the present invention further includes a second imaging optical system (16, 25) for enlarging and projecting an image of the surface of the aperture array in the image display apparatus. It is characterized by that.
According to this, the second imaging optical system enlarges and projects the image of the surface of the aperture array.

[4] Further, an image display device according to an aspect of the present invention is the above image display device, wherein at least two of the image display elements (20, 21) and a first of the first image display elements are used. A combining optical system (22) for combining and outputting the readout light and the second readout light from the second image display element having a polarization direction different from that of the first readout light; The optical system (23) forms an image of the light output from the combining optical system, and the polarizer array (24) includes the polarization direction of the first readout light and the polarization of the second readout light. It is characterized in that polarizers having a plurality of polarization directions respectively corresponding to the directions are arranged.
In one embodiment, polarizers having different polarization directions are alternately arranged in the polarizer array. In one form, two types of polarizers are arranged in a checkered pattern in plan view. At this time, the arrangement of the polarizers may be oblique to the image (for example, obliquely 45 degrees).
According to this, the 1st and 2nd read-out light is gift-reading from another image display element, respectively. The combining optical system combines and outputs these readout lights. In the polarizer array, polarizers corresponding to the polarization directions of the first and second readout lights are arranged, and according to the correspondence, a certain polarizer passes only the first readout light, and the other The polarizer passes only the second readout light. Thereby, high definition can be achieved.

[5] An image display device according to an aspect of the present invention is the image display device, wherein the red image display element (42), the blue image display element (43), and the surface of the polarizer array. A second imaging optical system for enlarging and projecting an image, wherein the first image display element is a first green image display element (40), and the second image display element is a first image display element. 2 green image display elements (41), wherein the first readout light is linearly polarized light having a first polarization direction, and the second readout light is linearly polarized light having a second polarization direction. The first polarization direction and the second polarization direction are substantially orthogonal, and the combining optical system (47) includes the first readout light, the second readout light, and the red color. Third readout light from the image display element and the blue image display element The third readout light is circularly polarized or non-polarized when input to the polarizer array, and the fourth readout light is When the light is input to the polarizer array, it is circularly polarized or non-polarized, and the polarizer array (49) includes a polarizer that transmits only light of the component of the first polarization direction and the second polarization direction. A polarizer that transmits only the light of the above component is appropriately disposed.
According to this, the polarization directions of the first readout light from the first green image display device and the second readout light from the second green image display device are orthogonal to each other. The combining optical system combines and outputs the first to fourth readout lights. The third and fourth readout lights are circularly polarized or non-polarized. Among the polarizers arranged in the polarizer array, a polarizer that transmits only light of a component in the first polarization direction is linearly polarized light in the first polarization direction and circularly polarized (or unpolarized) light. Of the first polarization direction. That is, the second readout light is shielded only through the first, third, and fourth readout lights. On the other hand, a polarizer that transmits only light in the second polarization direction passes a component in the second polarization direction out of linearly polarized light in the second polarization direction and circularly polarized (or unpolarized) light. . That is, the first readout light is shielded only through the second, third, and fourth readout lights. Thereby, high definition of the green image can be achieved.

[6] Moreover, the image display device according to an aspect of the present invention is the above image display device, wherein the red image display element (52), the blue image display element (53), and the composite optical system (59). A second imaging optical system (150) for enlarging and projecting the output from the first image display element, the first image display element being a first green image display element (50), and the second image. The display element is a second green image display element (51), the first readout light is linearly polarized light having a first polarization direction, and the second readout light is a second polarized light. Linear polarization having a direction, the first polarization direction and the second polarization direction are substantially orthogonal, and the polarizer array (58) includes only light of the component of the first polarization direction. And a polarizer that transmits only light of the component in the second polarization direction. The combining optical system (59) combines the first reading light and the second reading light after passing through the polarizer array, and further includes the above-described combining optical system (59). The third readout light from the red image display element and the fourth readout light from the blue image display element are combined and output.
According to this, the polarization directions of the first readout light from the first green image display device and the second readout light from the second green image display device are orthogonal to each other. Of the polarizers arranged in the polarizer array, a polarizer that transmits only light of a component in the first polarization direction shields the second readout light only through the first readout light. On the other hand, the polarizer that transmits only the light in the second polarization direction blocks the first readout light only through the second readout light. The combining optical system is provided after the polarizer array, and combines the first to fourth readout lights. At this time, regardless of the direction of polarization of the third readout light or the fourth readout light, they are synthesized and output by the synthesis optical system without passing through the polarizer array. Absent. Then, the output from the combining optical system is enlarged and projected by the second imaging optical system.

[7] The image display device according to an aspect of the present invention is the above image display device, wherein the red image display element (62), the blue image display element (63), and the polarizer array (69). And a diffusion plate provided close to the output side of the first image display element, the first image display element is a first green image display element (60), and the second image display element is a first image display element. 2 green image display elements (61), wherein the first readout light is linearly polarized light having a first polarization direction, and the second readout light is linearly polarized light having a second polarization direction. The first polarization direction and the second polarization direction are substantially orthogonal to each other, and the synthesis optical system (67) includes the first readout light, the second readout light, and the red color. Third readout light from the image display element and the blue image display element And the fourth readout light from the imaging optical system (68) is an enlarged projection, and the third readout light is input to the polarizer array. When the first read light is input to the polarizer array, the fourth read light is circularly polarized or unpolarized, and the polarizer array (69) has the first polarization direction. A polarizer that transmits only the component light and a polarizer that transmits only the component light in the second polarization direction are appropriately arranged.
According to this, the polarizer that transmits only the light of the component in the first polarization direction in the polarizer array is the second through only the first, third, and fourth readout lights, as described above. The reading light is shielded. In addition, the polarizer that transmits only the light of the component in the second polarization direction in the polarizer array passes through the second, third, and fourth readout lights only as described above, and the first readout light is transmitted. Shield the light.
Further, according to this, since the imaging optical system performs enlarged projection, the physical size of the projected image increases. Therefore, it is not necessary to separately provide an optical system for enlarging. Further, the diffusion plate appropriately diffuses the light that has passed through the polarizer array.

[8] An image display apparatus according to an aspect of the present invention includes an illumination optical system (70, 80 to 83) including a light source, an aperture array (75, 84) or a polarizer that transmits light from the illumination optical system. An array (84), an imaging optical system (74, 85) for imaging light that has passed through the aperture array or the polarizer array, and a pattern of the aperture array or the polarizer array by the imaging optical system. An image display element (72, 86) provided on the imaging plane and having pixels arranged corresponding to the pattern on the imaging plane, and second imaging optics for enlarging and projecting readout light from the image display element A system (76) is provided.
Here, the image display element may be a reflection type or a transmission type. The aperture is arranged corresponding to the pixel. According to this, the light passing through the aperture array or the polarizer array is imaged by the imaging optical system. An image display element is provided on the image formation surface, and the imaged pattern of the aperture array or the polarizer array corresponds to the pixel pattern of the image display element. With this configuration, it is possible to form an image or an aperture pattern at a portion other than the image display element, which is a special technical feature of the present invention, and to associate the pixels of the image display element with the aperture on the image formation plane. Has been.

[9] An image display apparatus according to an aspect of the present invention is the image display apparatus described above, wherein the image display element (91) is configured to form an image forming surface of the image by the imaging optical system (92). A lens array (94) in which a plurality of microlenses are arranged is provided on the side opposite to the incident direction of the readout light.
According to this, when a large number of element images serving as the basis of the integral stereoscopic image are displayed on the image display element, a stereoscopic image can be obtained by the action of the lens array. When a large number of element images are taken, a lens array made up of a large number of convex lenses is placed in front of the image sensor. Thereby, a large number of small inverted element images corresponding to the number of convex lenses are taken by the imaging device.

[10] An image display apparatus according to an aspect of the present invention is the image display apparatus described above, wherein the incident direction of the readout light from the image display element (91) with respect to the diffusion plate (97) is A lens array (94) in which a plurality of microlenses are arranged is provided on the opposite side.
According to this, a large number of element images having a physically large size are input to the polarizer array due to the enlarged projection of the imaging optical system. A large-sized stereoscopic image is obtained by the action of the lens array.

  [11] One embodiment of the present invention is a display system including the image display device according to any one of the above.

  According to the present invention, since it is not necessary to provide an aperture array or a polarizer array in the vicinity of the image display element, even if an image display element with a large aperture ratio is used, a high-definition pixel-shifted projection image display is possible.

[First embodiment]
FIG. 1 is a functional configuration diagram showing an outline of a configuration of a projection type image display apparatus according to an embodiment of the present invention. This projection type image display apparatus includes an illumination optical system 10, an image display element 12, a relay lens 14 (imaging optical system), an aperture array 15, and a projection lens 16 (second imaging optical system). The

  Illumination light 11 enters the image display element 12 from the illumination optical system 10. As the image display element 12, a transmissive or reflective liquid crystal device, a digital micromirror device, a grating light bubble, or the like can be used. However, in the present embodiment, a reflection that can realize high definition with the current technology. A type image display element is used. Then, the readout light 13 from the image display element 12 is imaged once by the relay lens 14. An aperture array 15 in which minute aperture stops corresponding to the pixel structure are arranged in an array is provided on this imaging plane. The light transmitted through the aperture array 15 is enlarged and formed by the projection lens 16 and projected and displayed on a screen or the like.

  In this method, as with a so-called dual focus projection lens (see also Japanese Patent Laid-Open No. 2005-157153), an image is formed once in the middle of the projection optical system. Due to such a configuration, there is a great merit that a required specification for the projection lens is low even in a reflection type projector such as a synthetic prism, which tends to have a long flange back of the projection lens.

  FIG. 2 is a schematic diagram showing the relationship between the pixel structure of the image display element 12 according to the present embodiment, the aperture array 15, and the projection image. When the pixel structure of the image display element 12 is shown in FIG. 2A, if an aperture array as shown in FIG. 2B is arranged, a projection image having a small size of one pixel as shown in FIG. It is done. In order to increase the input light to the aperture, a lens may be disposed in each aperture so that the light is condensed at the opening. Thereby, the utilization efficiency of light can also be improved.

  FIG. 3 is a schematic diagram showing a configuration of a projection-type image display apparatus in a case where images of two actual image display elements are combined as pixel shifts based on the above-described configuration. This projection-type image display device includes an illumination optical system 10, a polarizing beam splitter 22 (Polarizing Beam Splitter; PBS, combining optical system), image display elements 20 and 21, a relay lens 23 (imaging optical system), It includes a polarizer array 24 and a projection lens 25 (second imaging optical system). The image display elements 20 and 21 correspond to the image display element 12 of FIG. The relay lens 23 corresponds to the relay lens 14 in FIG. The polarizer array 24 corresponds to the aperture array 15. The projection lens 25 corresponds to the projection lens 16.

In FIG. 3, the illumination light from the illumination optical system 10 includes P-polarized light and S-polarized light, and the PBS 22 has a mirror that transmits P-polarized light and reflects S-polarized light therein. P-polarized light and S-polarized light are separated by the action of the PBS 22 and images are read from the image display element 21 and the image display element 20, respectively. The read light is combined by the PBS 22 and enters the relay lens 23 side. This light is imaged by the relay lens 23. As the relay lens 23, for example, an achromatic lens can be used, and an aberration-free and high-resolution lens can be manufactured relatively easily and at low cost.
The image formed by the relay lens 23 is formed on the polarizer array 24, and the polarizer array surface is further magnified and projected onto a screen or the like by the magnifying projection lens 25.

FIG. 4 is a plan view showing an example of the aperture arrangement in the polarizer array 24 shown in FIG. On the imaging plane of the polarizer array 24, the apertures 30 and 31 are arranged in a pattern as shown. The portion of the aperture 30 (shown as horizontal stripes in the figure) of the polarizer array 24 is a region having a characteristic of transmitting P-polarized light and blocking S-polarized light, and the portion of the aperture 31 (vertical stripes in the figure). Is an area having a characteristic of transmitting S-polarized light and blocking P-polarized light. The other regions (shown without stripes in the figure) are portions that block light. That is, in this polarizer array 24, the aperture portions (30 and 31) and the light shielding portions are arranged in a checkered pattern (checker pattern), and the apertures 30 and 31 are alternately arranged in the row direction.
The shape of the aperture region and the light shielding portion region is substantially square in the pattern shown in FIG. 4, but this shape does not have to be particularly square, and is round, rhombus, rectangular, hexagonal, etc. It does not matter. However, a brighter image as a whole can be obtained when the shape can be arranged in the plane without any gap.

  FIG. 5 is a plan view showing another example of the arrangement of regions in the polarizer array 24. In the pattern shown in FIG. 5, a region 32 (shown as a horizontal stripe in the figure) having a characteristic of transmitting P-polarized light and blocking S-polarized light, and transmitting S-polarized light and blocking P-polarized light. The regions 33 having characteristics (indicated by vertical stripes in the figure) are each substantially square and are alternately arranged in a checkered pattern with a direction of 45 degrees obliquely. The pattern shown in FIG. 5 has less light loss than the pattern shown in FIG.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 6 is a schematic diagram showing the configuration of the projection type image display apparatus according to the present embodiment. This projection type image display apparatus includes an illumination optical system 10 (not shown), a first green image display element 40, a second green image display element 41, a red image display element 42, and a blue color. The image display device 43 includes PBSs 44, 45 and 46, a dichroic prism 47, a relay lens 48, a polarizer array 49, and a projection lens (not shown). The readout light of each color (R (red), G (green), B (blue)) is appropriately colored by a color filter or the like based on the light from the illumination optical system 10.

  In FIG. 6, G (green) readout light from the illumination optical system 10 (not shown) includes S-polarized light and P-polarized light. Like the PBS 22 in the previous embodiment described with reference to FIG. In 44, the light is separated into S-polarized light and P-polarized light. Then, an image is read out from the first green image display element 40 (G1) and the second green image display element 41 (G2). These G 1 and G 2 that have passed through the PBS 44 again enter the dichroic prism 47. Similarly, the R (red) readout light from the illumination optical system 10 (not shown) reads out the image from the red image display element 42 via the PBS 45, and further, the PBS 45 and the λ / 4 wavelength plate. Then, the light enters the dichroic prism 47. Similarly, the B (blue) readout light from the illumination optical system 10 (not shown) reads an image from the blue image display element 43 via the PBS 46, and further, the PBS 46 and the λ / 4 wavelength plate. Then, the light enters the dichroic prism 47. Each of R and B light becomes circularly polarized light by the action of the λ / 4 wavelength plate. Note that R and B light may be non-polarized instead of circularly polarized.

These lights (G1, G2, R, B) are combined by a dichroic prism 47 (combining optical system). At this time, since S has a configuration in which S-polarized light (G2) and P-polarized light (G1) are mixed, the dichroic prism 47 can use a polarization-independent cross prism. The read light is imaged through the relay lens 48. In this case, G1 is P-polarized light, G2 is S-polarized light, R is circularly polarized light, and B is circularly polarized light.
These lights are imaged and input to the polarizer array 49 through the relay lens 48. The light passing through the polarizer array 49 is projected and imaged by the projection lens.

  FIG. 7 is a plan view showing a pixel arrangement obtained when the region arrangement pattern of the polarizer array 49 is the pattern shown in FIG. FIG. 7A shows a pixel constituted by P-polarized G1. That is, G1 transmits only the part of the region 32 in FIG. FIG. 7B shows a pixel constituted by S-polarized G2. That is, G2 transmits only the part of the region 33 in FIG. Thus, there is no interference between the G1 and G2 pixels. FIG. 7C shows a pixel constituted by circularly polarized R. FIG. 7D shows a pixel constituted by circularly polarized B. As described above, an image with an aperture ratio of 100% is displayed for both R and B. Further, when G1 is P-polarized light, G2 is S-polarized light, and R and B are circularly polarized light, the light quantity cut by the polarizer array is equal to about 50% for each of R, G, and B, and the overall luminance balance of the image. There is also an advantage that can be arranged. Finally, the image on the polarizer array 49 is enlarged and projected by the projection lens.

  When the imaging magnification by the relay lens is, for example, 1 time, the fineness of each region of the polarizer array is one pixel or less of the image display element, and in the case of high definition video, the fineness is 10 μm (micrometer) or less. is there. Regarding the manufacture of the polarizer array, the polarizer array can be formed with a multilayer film by the self-cloning film forming technique based on the photonic crystal technique, so that the polarizer array can be manufactured at a pitch of several micrometers (Japanese Patent Laid-Open No. 2001-249235, And S. Kawakami, T. Kawashima, and T, Sato, “Mechanism of shape formation of three dimensional nano structures by bias sputtering”, Appl. Phys. Lett., Vol. 74, no. 3, pp.463-465, (See also January 1999).

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
FIG. 8 is a schematic diagram showing the configuration of the projection type image display apparatus according to the present embodiment. This projection type image display device includes an illumination optical system 10 (not shown), a first green image display element 50, a second green image display element 51, a PBS 54, a relay lens 56, and the like. , Polarizer array 58, red image display element 52, blue image display element 53, PBS 55, relay lens 57, dichroic prism 59 (synthetic optical system), and projection lens 150 (second optical system). Imaging optical system).

  In FIG. 8, G readout light from the illumination optical system 10 (not shown) is separated into P-polarized light and S-polarized light by the PBS 54 (G1 and G2). Then, the images are read from the first green image display element 50 and the second green image display element 51, respectively. These are again synthesized by the PBS 54 and imaged on the surface of the polarizer array 58 through the relay lens 56. Then, the light enters the dichroic prism 59 through the polarizer array 58. On the other hand, the R readout light and the B readout light from the illumination optical system 10 (not shown) are respectively P-polarized light and S-polarized light in this embodiment, and are separated by PBS · 55, respectively, for red images. Images are read from the display element 52 and the blue image display element 53, synthesized by the PBS 55, and enter the dichroic prism 59 through the relay lens 57. As is apparent from the figure, neither the read light from the red image display element nor the blue image display element passes through the polarizer array 58. Therefore, any polarization direction of these lights (R, B) is not affected by the polarizer array. These lights (G 1, G 2, R, B) are combined by the dichroic prism 59 and further projected by the projection lens 150.

  A characteristic point of the configuration of the present embodiment that is different from that of the second embodiment described above is that a polarizer array 58 is provided between the relay lens 56 and the dichroic prism 59 so that the green image display elements 50 and 51 can be used. Only the read image is focused on the polarizer array 58. Thereby, since the red image and the blue image do not pass through the polarizer array, it is possible to prevent the luminance and image quality of the red image and the blue image from being lowered. This also makes it easy to design and manufacture the polarizer array 58 because the wavelength region of the polarizer array 58 can be narrow.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.
FIG. 9 is a schematic diagram showing the configuration of the projection type image display apparatus according to the present embodiment. This projection type image display apparatus includes an illumination optical system 10 (not shown), a first green image display element 60, a second green image display element 61, a red image display element 62, and a blue color. The image display device 63 includes PBSs 64 to 66, a dichroic prism 67 (combining optical system), and a projection lens 68 (imaging optical system). A polarizer array 69 is provided at a projection position by the projection lens 68.

In the first to third embodiments described above, the polarizer array (aperture) is placed on the surface imaged at approximately the same magnification by the relay lens. However, this embodiment finally displays the projection. Assuming that the screen size is about 50 inches (1 inch is about 2.54 centimeters) and the projection display is a relatively small size, as shown in the figure, the light transmitted through the dichroic prism 67 is projected. A lens 68 is enlarged and projected, and a polarizer array 69 is disposed at the projection position. Even in this case, the same effects as those of the above-described embodiments can be obtained.
In this embodiment, a diffusion surface (diffusion plate) is provided after the polarizer array 69. This diffusing surface is made of, for example, an acrylic plate, a plastic plate, a glass plate, or the like, and the surface is processed into, for example, a frosted glass shape so as to diffuse light.
In the present embodiment, the first green image display element 60, the second green image display element 61, the red image display element 62, the blue image display element 63, PBSs 64 to 66, the dichroic prism 67, The operation of the λ / 4 wavelength plate for red image and blue image is the same as that described with reference to FIG. Note that R and B light may be non-polarized instead of circularly polarized.

[Fifth Embodiment]
Next, still another embodiment of the present invention will be described.
FIG. 10 is a schematic diagram showing a configuration of a projection type image display apparatus according to the fifth embodiment. This projection type image display apparatus includes an illumination optical system 70, a first green image display element 60, an aperture array 75, a relay lens 74 (imaging optical system), an image display element 72, and a projection lens 76. (Second imaging optical system). A feature of this configuration is that an aperture array 75 is provided between the illumination optical system 70 and the relay lens 74. That is, an aperture array is provided in the illumination optical system.
In FIG. 10, the illumination light 71 from the illumination optical system 70 enters the aperture array 75 and forms an image once by the relay lens 74. And the image display element 72 is installed in this image plane. The readout light 73 from the image display element 72 is enlarged and imaged by the projection lens 76 and displayed.

  FIG. 11 is a schematic cross-sectional view showing a more specific arrangement of the optical system of the projection type image display apparatus according to the present embodiment. A light source 80, an illumination lens 81, and a condenser lens 83 in FIG. 11 correspond to the illumination optical system 70 in FIG. Further, an aperture array (or polarizer array) 84 in FIG. 11 corresponds to the aperture array 75 in FIG. Further, the relay lens 85 (imaging optical system) in FIG. 11 corresponds to the relay lens 74 in FIG. 10, and the image display element 86 in FIG. 11 corresponds to the image display element 72 in FIG. Note that the display of the projection lens 76 of FIG. 10 is omitted in FIG.

  In FIG. 11, the illumination light from the light source 80 passes through the illumination lens 81 to form a light source image 82. The illumination light then passes through the condenser lens 83, enters the aperture array (or polarizer array) 84, and forms an image once by the relay lens 85. An image display element 86 is installed on this image plane. As a result, the image on the aperture surface (or the polarizer array surface) is imaged and projected onto the surface of the image display element 86, so that illumination light in the shape of the aperture can be incident on the image display element. By reading this out with a general optical system and enlarging and projecting the same, it is possible to obtain the same effect as in the case where the aperture is inserted after image formation in each of the above-described embodiments. In the configuration according to the system of this embodiment, it is only necessary to change the illumination optical system of the conventional apparatus, and the existing system can be used as it is as the readout optical system, the synthesis optical system, the magnification optical system, and the like after the image display element. There are benefits.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described.
In the present embodiment, a projection display device capable of stereoscopic display is realized by adding a lens array plate. Here, the principle of the integral stereoscopic display method is used as the stereoscopic display method. In the integral stereoscopic image, a lens array made up of a number of convex lenses is placed in front of the image sensor at the time of imaging. Thereby, a large number of small inverted element images corresponding to the number of convex lenses are taken by the imaging device. At the time of reproduction, if the display element on which this elemental image is presented is placed at the position of the image pickup element and observed through a lens array placed on the front surface, the light emitted from the display element passes through the same path as at the time of shooting, so A stereo image can be reproduced at a position (Japanese Patent Laid-Open No. 11-098532 and Jun Arai, Hiroshi Kawai, Fumio Okano, “Microlenses arrays for integral imaging system”, APPLIED OPTICS, Vol. 45, No. 36, 20 December 2006 reference).

FIG. 12 is a schematic diagram illustrating a configuration of a projection type image display apparatus that displays an integral stereoscopic image according to the present embodiment. This projection type image display apparatus includes an illumination optical system 90, an image display element 91, a relay lens 92 (imaging optical system), an aperture array (or polarization element array) 93, and a lens array 94. Composed.
In FIG. 12, the illumination light from the illumination optical system 90 enters the image display element 91, reads the element image for reproducing the integral three-dimensional image described above, and forms the image once by the relay lens 92. An image read out from the image display element 91 is provided by installing an aperture array (or polarizer array) 93 on the image plane and a lens array 94 having minute convex lenses arranged in an array on the back surface. Is displayed as an integral stereoscopic image 95.

  FIG. 13 is a schematic diagram showing the configuration of a further modification. In the configuration shown in FIG. 13, an enlargement projection optical system 96 is provided instead of the relay lens 92 in FIG. 12, and an aperture array (or polarizer array) 93 and a diffusive screen 97 (diffusion) provided on the imaging surface thereof. A lens array 94 on the back of the diffusive screen 97. With this configuration, the image read from the image display element 91 is enlarged and projected by the enlargement / projection optical system 96, and an integral stereoscopic image 95 of a large screen is displayed by the action of the lens array 94.

  Next, an example of a display system using the image display device according to each of the above embodiments will be described. The display system according to this example includes the image display device according to any of the above-described embodiments or a modification device thereof. This display system has a light source included in the illumination optical system. Each part (lens and the like) of the optical system is movable and includes a drive system (motor and the like) for driving them. An image signal is input to one or a plurality of image display elements. A cable for transmitting an image signal from a television device, an image reproducing device (such as a DVD player or an HDD player), a computer, or a portable terminal can be connected to a terminal for inputting an image signal. Alternatively, image signals can be input from these various external devices wirelessly. Also included is a control system for controlling the amount of light, controlling the focus, and controlling various corrections (such as trapezoidal correction). Moreover, the power supply part which supplies required electric power to each said part is provided.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.
Each of the embodiments described above can be applied to the fields of ultra-high definition display systems and stereoscopic display systems.

It is a functional block diagram which shows the structure of the projection type image display apparatus by the 1st Embodiment of this invention. It is the schematic which shows the relationship between the pixel structure of the image display element by the same embodiment, an aperture array, and a projection image. It is the schematic which shows the structure of the projection type image display apparatus in the case of synthesize | combining the image of two image display elements by the embodiment. It is a top view which shows an example of the aperture arrangement | positioning in the polarizer array by the same embodiment. It is a top view which shows the example of arrangement | positioning of the area | region in the polarizer array by the same embodiment. It is the schematic which shows the structure of the projection type image display apparatus by the 2nd Embodiment of this invention. It is a top view which shows the pixel arrangement | positioning obtained by the area | region arrangement pattern of the polarizer array by the same embodiment. It is the schematic which shows the structure of the projection type image display apparatus by the 3rd Embodiment of this invention. It is the schematic which shows the structure of the projection type image display apparatus by the 4th Embodiment of this invention. It is the schematic which shows the structure of the projection type image display apparatus by the 5th Embodiment of this invention. It is a schematic sectional drawing which shows arrangement | positioning of the specific optical system of the projection type image display apparatus by the embodiment. It is the schematic which shows the structure of the projection type image display apparatus for integral three-dimensional image display by the 6th Embodiment of this invention. It is the schematic which shows the structure of the projection type image display apparatus by the modification of the embodiment.

Explanation of symbols

12 Image display element 14 Relay lens (imaging optical system)
15 Aperture arrays 20, 21 Image display element 23 Relay lens (imaging optical system)
24 Polarizer array 16, 25 Projection lens (second imaging optical system)
22 Polarizing beam splitter (PBS, synthesis optical system)
42 Red display element 43 Blue image display element 40 Green image display element G1 (first green image display element)
41 Green image display element G2 (second green image display element)
47 Dichroic prism (Synthetic optical system)
49 Polarizer array 52 Red image display element 53 Blue image display element 59 Synthesis optical system 150 Second imaging optical system 50 Green image display element G1 (first green image display element)
51 Green Image Display Element G2 (Second Green Image Display Element)
58 Polarizer array 62 Red image display element 63 Blue image display element 69 Polarizer array 60 Green image display element G1 (first green image display element)
61 Green image display element G2 (second green image display element)
67 Dichroic prism (synthetic optical system)
68 Projection lens (imaging optical system)
70 Illumination optical system 80 Light source (illumination optical system)
81 Illumination lens (illumination optical system)
83 Condenser lens (illumination optical system)
75,84 Aperture array (or polarizer array)
74,85 Relay lens (imaging optical system)
72.86 Image display element 76 Projection lens (second imaging optical system)
92 Relay lens (imaging optical system)
91 Image display element 94 Lens array 97 Diffusing screen (Diffusion plate)

Claims (11)

  1. An image display element having pixels arranged in an array;
    An imaging optical system that images readout light from the image display element;
    An image display apparatus, comprising: an aperture array provided on an image formation surface of an image by the image formation optical system, wherein at least one aperture is arranged for the pixel on the image formation surface.
  2. An image display element having pixels arranged in an array;
    An imaging optical system that images readout light from the image display element;
    An image display comprising: a polarizer array provided on an image forming surface of an image by the image forming optical system, wherein at least one polarizer is arranged for the pixel on the image forming surface. apparatus.
  3. The image display device according to claim 1, further comprising:
    An image display device comprising: a second imaging optical system that enlarges and projects an image of the surface of the aperture array.
  4. The image display device according to claim 2,
    At least two of the image display elements;
    Combining and outputting the first readout light from the first image display element and the second readout light from the second image display element having a polarization direction different from that of the first readout light. Optical system,
    With
    The imaging optical system forms an image of light output from the combining optical system,
    The polarizer array includes a plurality of polarizers each having a polarization direction corresponding to a polarization direction of the first readout light and a polarization direction of the second readout light. apparatus.
  5. The image display device according to claim 4,
    A red image display element;
    A blue image display element;
    A second imaging optical system for enlarging and projecting an image of the surface of the polarizer array;
    Further comprising
    The first image display element is a first green image display element,
    The second image display element is a second green image display element,
    The first readout light is linearly polarized light having a first polarization direction;
    The second readout light is linearly polarized light having a second polarization direction;
    The first polarization direction and the second polarization direction are substantially orthogonal,
    The combining optical system combines the first reading light, the second reading light, the third reading light from the red image display element, and the fourth reading light from the blue image display element. Output
    The third readout light is circularly polarized or non-polarized when input to the polarizer array;
    The fourth readout light is circularly polarized or non-polarized when input to the polarizer array;
    In the polarizer array, a polarizer that transmits only light of the component in the first polarization direction and a polarizer that transmits only light of the component in the second polarization direction are appropriately arranged. A characteristic image display device.
  6. The image display device according to claim 4,
    A red image display element;
    A blue image display element;
    A second imaging optical system for enlarging and projecting the output from the combining optical system;
    Further comprising
    The first image display element is a first green image display element,
    The second image display element is a second green image display element,
    The first readout light is linearly polarized light having a first polarization direction;
    The second readout light is linearly polarized light having a second polarization direction;
    The first polarization direction and the second polarization direction are substantially orthogonal,
    In the polarizer array, a polarizer that transmits only light of a component in the first polarization direction and a polarizer that transmits only light of a component in the second polarization direction are appropriately arranged.
    The combining optical system combines the first reading light and the second reading light after passing through the polarizer array, and further, the third reading light from the red image display element and the An image display device characterized by combining and outputting the fourth readout light from the blue image display element.
  7. The image display device according to claim 4,
    A red image display element;
    A blue image display element;
    A diffusion plate provided close to the output side of the polarizer array;
    Further comprising
    The first image display element is a first green image display element,
    The second image display element is a second green image display element,
    The first readout light is linearly polarized light having a first polarization direction;
    The second readout light is linearly polarized light having a second polarization direction;
    The first polarization direction and the second polarization direction are substantially orthogonal,
    The combining optical system combines the first reading light, the second reading light, the third reading light from the red image display element, and the fourth reading light from the blue image display element. Output
    The imaging optical system is for enlarging and projecting,
    The third readout light is circularly polarized or non-polarized when input to the polarizer array;
    The fourth readout light is circularly polarized or non-polarized when input to the polarizer array;
    In the polarizer array, a polarizer that transmits only light of the component in the first polarization direction and a polarizer that transmits only light of the component in the second polarization direction are appropriately arranged. A characteristic image display device.
  8. An illumination optical system including a light source;
    An aperture array or a polarizer array for passing light from the illumination optical system;
    An imaging optical system that forms an image of light that has passed through the aperture array or the polarizer array;
    An image display element provided on an image forming surface of the image forming optical system of the pattern of the aperture array or the polarizer array, and pixels arranged corresponding to the pattern on the image forming surface;
    A second imaging optical system for enlarging and projecting readout light from the image display element;
    An image display device comprising:
  9. The image display device according to any one of claims 1 to 5,
    An image display comprising a lens array having a plurality of microlenses arranged on the opposite side of the image forming surface of the image by the imaging optical system from the incident direction of the readout light from the image display element. apparatus.
  10. The image display device according to claim 7,
    An image display device comprising: a lens array in which a plurality of microlenses are arranged on a side opposite to an incident direction of readout light from the image display element with respect to the diffusion plate.
  11.   A display system including the image display device according to claim 1.
JP2007095457A 2007-03-30 2007-03-30 Image display device and display system Pending JP2008256740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007095457A JP2008256740A (en) 2007-03-30 2007-03-30 Image display device and display system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007095457A JP2008256740A (en) 2007-03-30 2007-03-30 Image display device and display system

Publications (1)

Publication Number Publication Date
JP2008256740A true JP2008256740A (en) 2008-10-23

Family

ID=39980401

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007095457A Pending JP2008256740A (en) 2007-03-30 2007-03-30 Image display device and display system

Country Status (1)

Country Link
JP (1) JP2008256740A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010160444A (en) * 2009-01-09 2010-07-22 Nippon Hoso Kyokai <Nhk> Video projector
JP2010243543A (en) * 2009-04-01 2010-10-28 Seiko Epson Corp Projector
JP2011078031A (en) * 2009-10-01 2011-04-14 Nippon Hoso Kyokai <Nhk> Apparatus for adjusting reference video display device, apparatus for adjusting imaging apparatus, and apparatus for adjusting display device
JP2013228607A (en) * 2012-04-26 2013-11-07 Sony Corp Display device and illumination device
JP2014215332A (en) * 2013-04-23 2014-11-17 独立行政法人情報通信研究機構 Video reading device and video reading method
JP2015162864A (en) * 2014-02-28 2015-09-07 日本放送協会 display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09211389A (en) * 1996-02-02 1997-08-15 Akihiro Fujimura Method for forming image including latent image and the like by processing of polarizability and forming device for image including latent image and the like
JPH1198532A (en) * 1997-09-25 1999-04-09 Nippon Hoso Kyokai <Nhk> Stereoscopic image pickup device and stereoscopic display device
JP2003098595A (en) * 2001-09-21 2003-04-03 Ricoh Co Ltd Image display device, pixel image reducing method and pixel image reducing optical structure
JP2004126034A (en) * 2002-09-30 2004-04-22 Fuji Photo Film Co Ltd Image forming apparatus
JP2006330327A (en) * 2005-05-26 2006-12-07 Matsushita Electric Ind Co Ltd Projection type three-dimensional image display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09211389A (en) * 1996-02-02 1997-08-15 Akihiro Fujimura Method for forming image including latent image and the like by processing of polarizability and forming device for image including latent image and the like
JPH1198532A (en) * 1997-09-25 1999-04-09 Nippon Hoso Kyokai <Nhk> Stereoscopic image pickup device and stereoscopic display device
JP2003098595A (en) * 2001-09-21 2003-04-03 Ricoh Co Ltd Image display device, pixel image reducing method and pixel image reducing optical structure
JP2004126034A (en) * 2002-09-30 2004-04-22 Fuji Photo Film Co Ltd Image forming apparatus
JP2006330327A (en) * 2005-05-26 2006-12-07 Matsushita Electric Ind Co Ltd Projection type three-dimensional image display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010160444A (en) * 2009-01-09 2010-07-22 Nippon Hoso Kyokai <Nhk> Video projector
JP2010243543A (en) * 2009-04-01 2010-10-28 Seiko Epson Corp Projector
JP2011078031A (en) * 2009-10-01 2011-04-14 Nippon Hoso Kyokai <Nhk> Apparatus for adjusting reference video display device, apparatus for adjusting imaging apparatus, and apparatus for adjusting display device
JP2013228607A (en) * 2012-04-26 2013-11-07 Sony Corp Display device and illumination device
JP2014215332A (en) * 2013-04-23 2014-11-17 独立行政法人情報通信研究機構 Video reading device and video reading method
JP2015162864A (en) * 2014-02-28 2015-09-07 日本放送協会 display device

Similar Documents

Publication Publication Date Title
US8922722B2 (en) Projection apparatus for providing multiple viewing angle images
TWI454826B (en) Projection display and method of displaying an overall picture
KR930010620B1 (en) Stereoscopic images display method
US8240854B2 (en) Autostereoscopic display device and a system using the same
JP4344285B2 (en) Display device
JP4147698B2 (en) Display optical device
KR100839282B1 (en) Display device and display method
JP2721332B2 (en) LCD projection display system
US7255444B2 (en) Optical unit and projection-type image display apparatus using the same
US7188953B2 (en) Display apparatus using LCD panel
US8602563B2 (en) Projection image display apparatus and projection optical system
KR100246861B1 (en) Illumination device and display device
KR100569793B1 (en) Projection type liquid crystal display device
JP4652110B2 (en) Projection-type image display device
EP1780560B1 (en) Spatial light modulator and projector
JP4052282B2 (en) Projector
JP4144624B2 (en) Projector
CN101171846B (en) Display apparatus using LCD panel
JP3901072B2 (en) Video display device and video display method
JP2007524111A (en) Color projection display system
US8144269B2 (en) Reflective LCOS displays utilizing novel polarizing beam splitters
US20070132953A1 (en) Stereoscopic display apparatus using LCD panel
JP4144623B2 (en) Projector
JP2005241870A (en) Space modulation unit and image projector
US6886945B2 (en) Projector

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090731

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20111012

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120127

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120207

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20120619