JP2005070438A - Display device and projection-type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device and a projection-type display device by which respective color light components of one pixel can be aligned and the quality of a displayed image can be improved. <P>SOLUTION: The display device is provided with a light modulation means 31 constituted of arraying pixels 32 each of which is provided with a group of color display areas 32r, 32g, 32b for emitting respectively different color light components and allowing respective color display areas 32r, 32g, 32b to modulate illumination light and emit respective color light components and a lens system 41 for combining a group of different color light components emitted from one pixel 32 to a domain of approximately the same area as the area of one pixel at a prescribed position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device and a projection display device.

2. Description of the Related Art Conventionally, a projection type display device that synthesizes image light using a light modulation device such as a liquid crystal light valve and enlarges and projects the synthesized image light on a screen through a projection optical system including a projection lens or the like is known. This projection display device includes a three-plate projection display device that uses three liquid crystal light valves according to the three primary colors of RGB, and a single-plate projection display device that uses only one.
A plurality of pixels are arranged in the liquid crystal light valve of the single-plate projection display device, and color light emission areas corresponding to the three primary colors of RGB are provided in each pixel. The single-plate projection display device controls the color light emitted from the emission region to express the color of the pixel, and thus forms and projects a color image (see, for example, Patent Document 1).
Japanese Patent No. 2622185

  As described above, in a conventional projection display device, when an image is projected with a large enlargement, the pixels are also greatly enlarged. Therefore, color light corresponding to R (red), G (green), and B (blue) The exit area of the slab is visible. In particular, for character display, there is a problem that the emission area of colored light corresponding to RGB appears prominently and the image quality of the displayed image is degraded.

  The present invention has been made to solve the above-described problem, and provides a display device and a projection display device that can match the color lights in one pixel and improve the image quality of a displayed image. For the purpose.

  In order to achieve the above object, a display device according to the present invention has a pixel array having a set of color display areas for emitting different color lights, and the color display area modulates illumination light to emit color light. A light modulation unit that emits light, and a lens system that synthesizes a set of different color lights emitted from the one pixel into a region having a substantially same area as the area of the one pixel at a predetermined position. It is characterized by.

  That is, the display device of the present invention includes a lens system that combines a set of different colored lights emitted from one pixel into a region having an area substantially the same as the area of one pixel at a predetermined position. Different sets of colored light can be matched. Therefore, for example, even when a display image is enlarged and projected, and a pixel is also enlarged, a set of different color lights emitted from one pixel cannot be seen individually, so that the image quality of the displayed image can be improved. .

In order to realize the above-described configuration, a lens system includes a first microlens array including microlenses having substantially the same shape as the color display region, a second microlens array having substantially the same shape as the first microlens array, a pixel, A third microlens array composed of microlenses having substantially the same shape, the first microlens array condenses the color light emitted from the color display area on the second microlens array, and the second microlens array and the second microlens array It is desirable that the three microlens array synthesize a set of different colored lights.
According to this configuration, the first microlens array condenses the color light emitted from the color display area on the second microlens array, and the second microlens array and the third microlens array are a set of different color lights. Is synthesized. Therefore, the set of different color lights can be matched more reliably, and the set of different color lights emitted from one pixel can be prevented from being seen individually, and the image quality of the displayed image can be improved.

In order to realize the above configuration, more specifically, when the color display areas in the pixel are arranged in a line, the third microlens array is a focal point of the first and second microlens arrays. It is desirable to have a focal length that is several times the number of color display areas arranged with respect to the distance.
According to this configuration, since the third microlens array has a focal length that is several times the color display area arranged with respect to the focal lengths of the first and second microlens arrays, the focal position of the third microlens array An aerial image can be formed by matching the set of different color lights.

In order to realize the above configuration, more specifically, when each color display area in the pixel is arranged in the same number of matrixes in one column and the other column, the third microlens array includes the first microlens array. It is desirable to have a focal length that is several times the color display area arranged in one column or the other column with respect to the focal length of the second microlens array.
According to this configuration, the third microlens array has a focal length that is several times the color display area arranged in one column or the other column with respect to the focal lengths of the first and second microlens arrays. The set of different color lights can be matched with the focal position of the third microlens array to form an aerial image.

In order to realize the above configuration, a fourth microlens array having first and second lens surfaces having substantially the same shape as the color display region on both surfaces, and a third microlens made of microlenses having substantially the same shape as the pixels. A lens array, the first lens surface condenses the color light emitted from the color display area on the second lens surface, and the second lens surface and the third microlens array synthesize a set of different color lights. Is desirable.
According to this configuration, the first lens surface condenses the color light emitted from the color display area on the second lens surface, and the second lens surface and the third microlens array combine a set of different color lights. Yes. Therefore, the set of different color lights can be matched more reliably, and the set of different color lights emitted from one pixel can be prevented from being seen individually, and the image quality of the displayed image can be improved.

In order to realize the above-described configuration, more specifically, when the color display areas in the pixels are arranged in a line, the third microlens array has the focal length of the first and second lens surfaces. It is desirable to have a focal length that is several times the number of color display areas arranged.
According to this configuration, the third microlens array has a focal length that is several times the color display area arranged with respect to the focal lengths of the first and second lens surfaces. A set of different colored lights can be matched to form an aerial image.

In order to realize the above configuration, more specifically, when each color display area in the pixel is arranged in the same number of matrixes in one column and the other column, the third microlens array includes the first microlens array. The focal length of the second lens surface is preferably several times the number of color display areas arranged in the one row or the other row.
According to this configuration, the third microlens array has a focal length that is several times the color display area arranged in the one column or the other column with respect to the focal lengths of the first and second lens surfaces. The set of different color lights can be matched with the focal position of the third microlens array to form an aerial image.

A projection display device of the present invention is a projection display device including a light source, a display device that modulates illumination light from the light source, and a projection unit that projects light modulated by the display device. Is the display device of the present invention.
That is, since the projection type display device of the present invention includes the display device of the present invention, the set of different colored lights can be matched. For this reason, even when an image is enlarged and projected, each color light is not seen separately, and the image quality of the displayed image can be improved.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic view of a projection display device according to the present invention.
The projection display device 10 includes a light source 20 that emits white light, an illumination system 25 that makes the illuminance distribution of the white light uniform and parallel, a display device 30 that modulates white light, and the modulated light. A projection lens (projection means) 50 for projecting is schematically configured.
As shown in FIG. 1, the light source 20 of the projection display device 10 according to the present embodiment includes a lamp 21 such as a metal halide and a reflector 22.
The illumination system 25 includes a rod integrator 26 and a condenser lens system 27. As the rod integrator 26, a transparent rod-shaped light guide (for example, a glass rod), or a tubular light guide whose inner surface is a reflection surface (for example, a kaleidoscope in which a plurality of reflection mirrors are arranged in a tubular shape facing inward). ) Etc. are used. The condenser lens system 27 is provided with a condenser lens 27a and a condenser lens 27b so that light incident from the rod integrator 26 enters the display device 30 as parallel light.

FIG. 2 is a partial top view of the display device of the present invention. FIG. 3 is an exploded perspective view of the display device of the present invention.
As shown in FIG. 2, the display device 30 includes a liquid crystal light valve (light modulation means) 31 that displays the color image by modulating the incident light into each color light, and a combined lens that matches and combines the modulated color lights. A system (lens system) 41 is schematically configured.
The liquid crystal light valve 31 uses a TN (Twisted Nematic) mode active matrix transmissive liquid crystal cell using a thin film transistor (hereinafter abbreviated as TFT) as a pixel switching element. The liquid crystal light valve 31 has substantially square pixels 32 for displaying an image arranged in a matrix. As shown in FIGS. 2 and 3, a vertically long stripe shape that emits RGB color light into one pixel 32. Pixels are arranged side by side. For example, these stripe-shaped pixels are pixels (color display areas) 32r corresponding to R (color display areas) 32g and pixels (color display areas) 32g corresponding to R and pixels (colors) corresponding to B from right to left with respect to the emission direction of the colored light. The display area is arranged in the order of 32b. Each of the pixels 32r, 32g, and 32b is provided with a color filter (not shown) corresponding to RGB, and white light is converted into each color light by passing through the color filter.

As shown in FIGS. 2 and 3, the synthetic lens system 41 includes a first microlens array 42 and a second microlens array 43 configured by microcylindrical lenses having substantially the same shape as the striped pixels 32 r, 32 g, and 32 b. And a third microlens array 44 composed of microcylindrical lenses having substantially the same shape as the pixels 32.
The first microlens array 42 and the second microlens array 43 have the same focal length f1, and the third microlens array 44 has a focal length f3 that is approximately three times the focal length f1.
The first microlens array 42 is arranged in the vicinity of the liquid crystal light valve 31 so that each color light emitted from the pixels 32r, 32g, and 32b enters each microcylindrical lens. The second microlens array 43 is located at a focal distance f1 from the first microlens array 42, and each color light collected by the first microlens array 42 is an individual microcylindrical of the second microlens array 43. It arrange | positions so that it may inject into a lens. The third microlens array 44 is arranged in the vicinity of the second microlens array 43 so that a set (RGB) of color light emitted from one pixel 32 enters one microcylindrical lens. .

Next, the operation of the projection display device 10 having the above configuration will be described.
As shown in FIG. 1, the white light emitted to the surroundings by the lamp 21 emitting light is reflected by the reflector 22 and enters the rod integrator 26. The white light incident on the rod integrator 26 repeats internal reflection in the rod integrator 26, and when it is emitted from the emission end face, the illuminance is made uniform and emitted from the emission side end face.
The white light emitted from the rod integrator 26 passes through the condenser lens 27 a and the condenser lens 27 b to become parallel light, and is emitted toward the display device 30.
The white light incident on the display device 30 first enters the liquid crystal light valve 31. The white light incident on the liquid crystal light valve 31 is selectively modulated for each of the pixels 32r, 32g, and 32b, and passes through the color filter to become each color light RGB, and is emitted toward the first microlens array 42.

Each color light emitted toward the first micro lens array 42 is incident on a micro cylindrical lens constituting the first micro lens array 42. Each color light incident on the first microlens array 42 is condensed and incident toward the second microlens array 43 arranged at a position away from the focal length f1. Each color light incident on the second microlens array 43 passes through the second microlens array 43 and enters the third microlens array 44.
Color light RGB emitted from a pair of pixels 32r, 32g, and 32b in the pixel 32 is incident on the third microlens array 44. The color light RGB is synthesized as a spatial image at a position of a region A having a focal length f3 away from the third microlens array 44 and having substantially the same shape and area as the pixel 32.
Thereafter, each color light enters the projection lens 50 and is emitted toward the projection screen S as shown in FIG.

  According to the above configuration, the first microlens array 42 and the second microlens array that combine a set of different color lights RGB emitted from one pixel 32 into a region A having an area substantially the same as the area of one pixel. 43, since the third microlens array 44 is provided, a set of different color lights RGB can be matched, and the image quality of an image to be projected and displayed can be improved.

  Since the third microlens array 44 has a focal length f3 that is substantially three times the focal length f1 of the first and second microlens arrays 42 and 43, the third microlens array 44 has a focal position f in the region A. The aerial image can be formed by matching a set of different color lights RGB. Therefore, it is possible to improve the image quality of an image to be projected and displayed.

  In addition, since the first microlens array 42 is disposed in the vicinity of the liquid crystal light valve 31, less color light is lost when passing through the first microlens array 42. Similarly, since the third microlens array 44 is in the vicinity of the second microlens array 43, the color light lost when passing through the third microlens array 44 is reduced. Therefore, the utilization efficiency of the light emitted from the light source 20 can be improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device in the present embodiment is the same as that of the first embodiment, but the display device is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the display device will be described with reference to FIG. 4, and description of the light source and the like will be omitted.
FIG. 4 is a partial top view of the display device in this embodiment.
As shown in FIG. 4, the display device 60 modulates incident light into each color light to display a color image, and a synthetic lens system (lens system) for matching and synthesizing each modulated color light. 61.

  The synthetic lens system 61 includes a fourth microlens array (first microlens array) 62 composed of microcylindrical lenses having substantially the same shape as the stripe-shaped pixels 32r, 32g, and 32b, and a microlens having substantially the same shape as the pixels 32. The third microlens array 44 is composed of a cylindrical lens. The first lens surface 63 on the liquid crystal light valve 31 side and the second lens surface 64 on the third microlens array 44 side in the fourth microlens array 62 are both formed so that the focal length is f4. . The focal length f4 is approximately 1/3 of the focal length f3. The distance between the first lens surface 63 and the second lens surface 64 is f4, and the fourth microlens array 62 is formed such that the second lens surface 64 is disposed at the focal position of the first lens surface 63. Has been.

  The fourth microlens array 62 is arranged in the vicinity of the liquid crystal light valve 31, and is arranged so that each color light emitted from the pixels 32r, 32g, and 32b enters each microcylindrical lens. The third microlens array 44 is disposed in the vicinity of the fourth microlens array 62 so that a set (RGB) of color light emitted from one pixel 32 enters one microcylindrical lens. .

Next, the operation of the display device 60 according to the second embodiment of the present invention will be described.
In addition, about the other components, such as the light source 20 in this Embodiment, since the effect | action is the same as that of 1st Embodiment, the description is abbreviate | omitted.
The display device 60 receives white light that has been made uniform by the illumination system and has been converted into parallel light. The white light incident on the display device 60 first enters the liquid crystal light valve 31. The white light incident on the liquid crystal light valve 31 is selectively modulated for each of the pixels 32r, 32g, and 32b, and passes through the color filter to become each color light RGB and is emitted toward the fourth microlens array 62.

Each color light emitted toward the fourth microlens array 62 is incident on the microcylindrical lens constituting the fourth microlens array 62 from the first lens surface 63. Each color light incident on the fourth microlens array 62 is condensed toward the second lens surface 64 formed at a position away from the focal length f4. Each color light incident on the second lens surface 64 passes through the second lens surface 64 and enters the third microlens array 44.
Color light RGB emitted from a pair of pixels 32r, 32g, and 32b in the pixel 32 is incident on the third microlens array 44. The color light RGB is synthesized as a spatial image at a position of a region A having a focal length f3 away from the third microlens array 44 and having substantially the same shape and area as the pixel 32.
Thereafter, each color light enters the projection lens 50 and is emitted toward the projection screen S as shown in FIG.

  According to the above configuration, the fourth microlens array 62 and the third microlens array that combine a set of different color lights RGB emitted from one pixel 32 into a region A having an area substantially the same as the area of one pixel. 44, the set of different color lights RGB can be matched, and the image quality of the image to be projected and displayed can be improved.

  Since the third microlens array 44 has a focal length f3 that is substantially three times the focal length f4 of the first lens surface 63 and the second lens surface 64, the third microlens array 44 is located in the focal position region A of the third microlens array 44. The aerial image can be formed by matching a set of different color lights RGB. Therefore, it is possible to improve the image quality of an image to be projected and displayed.

  In addition, since the fourth microlens array 62 is disposed in the vicinity of the liquid crystal light valve 31, less color light is lost when passing through the fourth microlens array 62. Similarly, since the third microlens array 44 is in the vicinity of the fourth microlens array 63, the color light lost when passing through the third microlens array 44 is reduced. Therefore, the utilization efficiency of the light emitted from the light source 20 can be improved.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the projection display device in the present embodiment is the same as that of the first embodiment, but the display device is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the display device will be described with reference to FIGS. 5 and 6, and description of the light source and the like will be omitted.
FIG. 5 is a partial top view of the display device in this embodiment. FIG. 6 is an exploded perspective view of the display device according to the present embodiment. As shown in FIG. 5, the display device 70 is a liquid crystal light valve (light modulation) that modulates incident light into each color light to display a color image. Means) 71 and a synthetic lens system (lens system) 81 for matching and synthesizing each modulated color light.

  In the liquid crystal light valve 71, substantially square-shaped pixels 72 for displaying an image are arranged in a matrix. As shown in FIGS. 5 and 6, R (red), G (green), Substantially square pixels that emit B (blue) and W (white) color light are arranged in a 2 × 2 matrix. For example, the pixels emitting these colored lights are pixels (color display areas) 72r corresponding to R, pixels 72g corresponding to R (color display areas) 72g, B from right to left and top to bottom with respect to the emission direction of the color lights. Are arranged in the order of pixels (color display area) 72b corresponding to, and pixels (color display area) 72w corresponding to W. Each of the pixels 72r, 72g, 72b is provided with a color filter (not shown) corresponding to RGB, and white light is converted into each color light by passing through the color filter. The pixel 72w is not provided with a color filter, and white light transmitted therethrough is emitted as white light.

The synthetic lens system 81 includes a fifth microlens array (first microlens array) 82 and a sixth microlens array (second microlens array) configured by microlenses having substantially the same shape as the pixels 72r, 72g, 72b, and 72w. ) 83 and a seventh microlens array (third microlens array) 84 composed of microlenses having substantially the same shape as the pixel 72.
The fifth microlens array 82 and the sixth microlens array 83 have the same focal length f1, and the seventh microlens array 84 has a focal length f3 that is approximately three times the focal length f1.

  The fifth microlens array 82 is arranged in the vicinity of the liquid crystal light valve 71 so that each color light emitted from the pixels 82r, 82g, 82b, and 82w enters each microlens. The sixth microlens array 83 is located at a focal distance f1 from the fifth microlens array 82, and each color light collected by the fifth microlens array 82 is an individual microlens of the sixth microlens array 83. It is arrange | positioned so that it may inject into. The seventh microlens array 84 is arranged in the vicinity of the sixth microlens array 83 so that a set (RGBW) of color light emitted from one pixel 72 enters one microlens.

Next, the operation of the display device 70 according to the third embodiment of the present invention will be described.
In addition, about the other components, such as the light source 20 in this Embodiment, since the effect | action is the same as that of 1st Embodiment, the description is abbreviate | omitted.
The display device 70 receives white light that has been made uniform by the illumination system and has been made parallel. The white light incident on the display device 70 first enters the liquid crystal light valve 71. The white light incident on the liquid crystal light valve 71 is selectively modulated for each of the pixels 72r, 72g, 72b, and 72w, and passes through the color filter in the pixels 72r, 72g, and 72b to become each color light RGB, and the pixel 72w. , The white light W is emitted toward the fourth microlens array 62 as it is.

Each color light emitted toward the fifth microlens array 82 is incident on a micro cylindrical lens constituting the fifth microlens array 82. Each color light incident on the fifth microlens array 82 is condensed toward the sixth microlens array 83 disposed at a position away from the focal length f1 and enters. Each color light incident on the sixth microlens array 83 passes through the sixth microlens array 83 and enters the seventh microlens array 84.
Color light RGBW emitted from a pair of pixels 72r, 72g, 72b, 72w in the pixel 72 is incident on the seventh microlens array 84, and the color light RGBW is separated from the seventh microlens array 84 by a focal length f3. 72 is synthesized as a spatial image at the position of a region A ′ having substantially the same shape and area as 72.
Thereafter, each color light enters the projection lens 50 and is emitted toward the projection screen S as shown in FIG.

  According to the above configuration, the fifth microlens array 82 and the sixth microlens array that synthesize a set of different color lights RGBW emitted from one pixel 72 into a region A having substantially the same area as one pixel. 83, since the seventh microlens array 84 is provided, a set of different color lights RGBW can be matched, and the image quality of the projected and displayed image can be improved.

  Since the seventh microlens array 84 has a focal length f3 that is substantially three times the focal length f1 of the first and second microlens arrays 82 and 83, the focal position region A ′ of the seventh microlens array 84 is obtained. In addition, a set of different color lights RGBW can be matched to form an aerial image. Therefore, it is possible to improve the image quality of an image to be projected and displayed.

  Further, since the fifth microlens array 82 is arranged in the vicinity of the liquid crystal light valve 71, the color light lost when passing through the fifth microlens array 82 is reduced. Similarly, since the seventh microlens array 84 is in the vicinity of the sixth microlens array 83, the color light lost when passing through the seventh microlens array 84 is reduced. Therefore, the utilization efficiency of the light emitted from the light source 20 can be improved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the description has been made by adapting to the configuration using the rod integrator 26 to make the illuminance of the light emitted from the light source 20 uniform, but the configuration is limited to the configuration using the rod integrator 26. The present invention can be applied to a configuration using various other illuminance equalizing means, such as a configuration using a set of microlens arrays 90 (see FIG. 7).
In the above-described embodiment, the light source 20 is described as being adapted to use a lamp 21 such as a metal halide. However, the present invention is not limited to the configuration using the lamp 21, and a light-emitting diode that is a solid-state light source or the like. It can be applied to those using various other light sources.

It is the schematic of the projection type display apparatus in the 1st Embodiment of this invention. FIG. 3 is a partial top view of the display device. FIG. 2 is an exploded perspective view of the display device. It is a partial top view of the display apparatus in the 2nd Embodiment of this invention. It is a partial top view of the display apparatus in the 3rd Embodiment of this invention. FIG. 2 is an exploded perspective view of the display device. It is the schematic of the projection type display apparatus in another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Projection type display apparatus, 20 ... Light source, 30, 60, 70 ... Display apparatus, 31, 71 ... Liquid crystal light valve (light modulation means), 32, 72 ... Pixel, 32r 32g, 32b, 72r, 72g, 72b, 72w ... Pixel (color display area), 41, 61, 81 ... Synthetic lens system (lens system), 42 ... First micro lens array, 43. .. Second microlens array, 44... Third microlens array, 50... Projection lens (projection means), 62... Fourth microlens array (first microlens array), 63. 1st lens surface, 64 ... 2nd lens surface, 82 ... 5th micro lens array (1st micro lens array), 83 ... 6th micro lens array (2nd micro lens array), 8 ... seventh microlens array (third microlens array)

Claims (8)

An array of pixels each having a set of color display areas that emit different colored light,
A light modulation means for the color display region to emit illumination light by modulating illumination light; and
A display device comprising: a lens system that synthesizes a set of different colored lights emitted from the one pixel into a region having an area substantially the same as the area of the one pixel at a predetermined position. The lens system has a first microlens array composed of microlenses having substantially the same shape as the color display region, a second microlens array having substantially the same shape as the first microlens array, and a shape substantially identical to the pixels. A third microlens array comprising microlenses,
The first microlens array condenses the color light emitted from the color display area on the second microlens array;
The display device according to claim 1, wherein the second microlens array and the third microlens array synthesize the set of different color lights. When the color display areas in the pixels are arranged in a line,
3. The display device according to claim 2, wherein the third microlens array has a focal length that is several times the number of the arranged color display areas with respect to the focal lengths of the first and second microlens arrays. When the respective color display areas in the pixels are arranged in a matrix of the same number in one column and the other column,
The third microlens array has a focal length that is several times the color display area arranged in the one column or the other column with respect to the focal lengths of the first and second microlens arrays. The display device according to claim 2. A fourth microlens array having both first and second lens surfaces having substantially the same shape as the color display area, and a third microlens array comprising microlenses having substantially the same shape as the pixels,
The first lens surface condenses the color light emitted from the color display area on the second lens surface;
The display device according to claim 1, wherein the second lens surface and the third microlens array combine the set of different color lights. When the color display areas in the pixels are arranged in a line,
6. The display device according to claim 5, wherein the third microlens array has a focal length that is several times the number of the arranged color display areas with respect to the focal lengths of the first and second lens surfaces. When the respective color display areas in the pixels are arranged in a matrix of the same number in one column and the other column,
The third microlens array has a focal length that is several times the color display area arranged in the one row or the other row with respect to the focal length of the first and second lens surfaces. The display device according to claim 5. A projection display device comprising: a light source; a display device that modulates illumination light from the light source; and a projection unit that projects light modulated by the display device,
A projection display device, wherein the display device is the display device according to claim 1.

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