JP2005283945A - Frame body and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal projector capable of reducing temperature differences among respective liquid crystal panels and improving cooling efficiency. <P>SOLUTION: The liquid crystal projector 1 is equipped with: a frame body 5 which has a dichroic mirror 3 separating the light from a lamp 10 into three color lights and a total reflecting mirror 4 reflecting the color lights separated by the dichroic mirror, the dichroic mirror and total reflecting mirror being united with transparent glass; a liquid crystal panel 2 to which the light from the lamp is guided by the frame body through an incidence-side polarizing plate 7; and a dichroic prism 6 which synthesizes the color lights projected from the liquid crystal panel. The incidence-side polarizing plate 7 comes into contact with the frame body and a projection-side polarizing plate 8 comes into contact with the dichroic prism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a frame and a display device. More specifically, the present invention relates to a frame and a display device that are intended to reduce the temperature difference between the display panels and to enhance the heat dissipation effect by integrating the spectroscopic plate and the reflection plate with a light transmissive material.

  Conventionally, images such as red, green, and blue obtained by making light emitted from a light source unit such as a power lamp enter a light valve such as a liquid crystal panel are projected onto a screen or the like by a projection lens. A projection display device such as a liquid crystal projector that displays a full-color image has been proposed (see, for example, Patent Document 1).

Hereinafter, a conventional liquid crystal projector will be described with reference to the drawings.
FIG. 5 is a schematic diagram for explaining a conventional liquid crystal projector. A three-plate liquid crystal projector 101 shown here corresponds to the three primary colors of light, red, green, and blue, and is arranged 3 independently. A liquid crystal panel 102 is provided. The light emitted from the lamp 103 is made uniform in light quantity per unit area by the fly-eye lens 104, and further, the vibration direction of the light is made uniform by the PS separation / combination plate 105. The light having the same vibration direction is separated by the dichroic mirror 106 into red light indicated by symbol R in FIG. 5, green light indicated by symbol G in FIG. 5, and blue light indicated by symbol B in FIG. And is incident on the liquid crystal panel through the incident side polarizing plate 108. The light whose polarization state has changed in the liquid crystal panel is transmitted through the output-side polarizing plate 109, and the red, green, and blue light is synthesized by the dichroic prism 110, and is further magnified by the projection lens 111 to form a screen (not shown). Projected.

  By the way, as the brightness of liquid crystal projectors in recent years progresses, cooling of the liquid crystal panel has become important. As shown in FIG. 6, the cooling of the liquid crystal panel applies a wind to the surface of the liquid crystal panel by a fan 112. An air cooling method is generally employed in which the amount of heat generated in the liquid crystal panel is cooled with air to lower the temperature.

Japanese Patent Laid-Open No. 11-242188

  The liquid crystal panels are cooled by the air cooling method as described above, but each liquid crystal panel has a temperature difference due to the difference in energy of red light, green light, and blue light. This affects the electro-optical characteristics of the liquid crystal, and the display image quality is significantly reduced. Further, it is not sufficient to cope with a decrease in cooling efficiency due to the downsizing of the liquid crystal panel.

  The present invention was devised in view of the above points, and an object of the present invention is to provide a frame and a display device capable of reducing the temperature difference between the display panels and improving the cooling efficiency. To do.

  In order to achieve the above object, a frame according to the present invention is a frame that guides light from a light source to a display panel that is in contact with a polarizing plate, and a plurality of spectral components that separate light from the light source into three color lights. A plate and a reflecting plate that reflects the color light separated by the spectroscopic plate; the polarizing plate is in contact with the frame; and the spectroscopic plate and the reflecting plate are integrated with a light-transmitting material.

  Here, even if the display panel in contact with the frame body through the polarizing plate causes a temperature difference according to the incident color light by integrating the spectroscopic plate and the reflecting plate with the light transmissive material. The heat conduction through the frame can be performed, the temperature difference between the display panels can be reduced, and the cooling efficiency can be improved.

  In order to achieve the above object, a display device according to the present invention includes a plurality of spectral plates that separate light from a light source into three color lights, and a reflective plate that reflects the color light separated by the spectral plates. A plurality of display panels in which light from a light source is guided through a polarizing plate by the frame body, the spectral plate and the reflection plate being integrated by a light transmissive material, and each display panel The display device includes a prism that synthesizes emitted color light, and the polarizing plate is in contact with the frame.

  Here, when the polarizing plate in contact with the display panel is in contact with the frame, even if a temperature difference occurs in each display panel according to the incident color light, heat conduction through the frame can be performed, and each display The temperature difference between the panels can be reduced, and the cooling efficiency can be improved.

  The display panel is preferably in contact with the frame body and the prism through the polarizing plate. Accordingly, heat conduction can be performed to both the frame and the prism, the temperature difference between the display panels can be further reduced, and the cooling efficiency can be further improved.

Furthermore, since the display panel is in contact with the frame body and the prism through the polarizing plate, air is not applied to the display panel surface when the display panel is cooled by an air cooling method, thereby preventing adhesion dust on the display panel surface. Can do.
That is, the air used for cooling the display panel is usually indoor air outside the display device and contains dust or dust floating in the air. Therefore, when the display panel is cooled, When air hits the surface, dust and other dust will adhere, but when the display panel cools the display panel by contacting the frame and prism through the polarizing plate, the air does not hit the display panel surface. For this reason, dust adhering to the display panel surface can be prevented.

  In the frame and display device of the present invention described above, since the temperature difference between the display panels can be reduced, the change in electro-optical characteristics of each display panel due to the temperature difference can be suppressed, and the display quality can be improved. Can be achieved.

  In addition, since the frame body in contact with the display panel absorbs the heat of the display panel, it is possible to improve the decrease in cooling efficiency accompanying the downsizing of the display device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to facilitate understanding of the present invention.
FIG. 1 is a schematic diagram for explaining a liquid crystal projector which is an example of a display device to which the present invention is applied. The three-plate liquid crystal projector 1 shown here corresponds to the three primary colors red, green and blue. Three liquid crystal panels 2, a dichroic mirror 3 that separates light into three color lights of red light, green light, and blue light, and a total reflection mirror 4 that guides the color light to the liquid crystal panel are integrated by a transparent glass such as quartz. A frame 5 and a dichroic prism 6 that combines red light, green light, and blue light emitted from three liquid crystal panels are provided.

  An incident-side polarizing plate 7 is bonded to the incident-side surface of each liquid crystal panel, and an outgoing-side polarizing plate 8 is bonded to the outgoing-side surface. The incident-side polarizing plate is bonded to the frame, and is emitted. The side polarizing plate is bonded to the dichroic prism. In other words, each liquid crystal panel, frame, and dichroic prism are integrally formed, and the amount of heat generated in the liquid crystal panel can be released to the frame and dichroic prism via the incident side polarizing plate and output side polarizing plate. Has been.

  In this embodiment, the liquid crystal panel, the frame, and the dichroic prism are integrally formed by bonding the incident side polarizing plate to the frame and bonding the output side polarizing plate to the dichroic prism. It is sufficient that the amount of heat generated in the panel can be released to the frame through the incident side polarizing plate and to the dichroic prism through the output side polarizing plate. The plate and the dichroic prism do not need to be bonded together, and may simply be disposed so that the incident side polarizing plate and the frame, and the output side polarizing plate and the dichroic prism are in contact with each other.

  Further, in this embodiment, the gap portion 9 is formed between the side surface of the liquid crystal panel and the frame, and the side surface of the liquid crystal panel and the frame are not in contact with each other. However, it is not always necessary to form the gap portion. As shown in FIG. 2A, the side surface of the liquid crystal panel and the frame may be in contact with each other.

In this embodiment, the liquid crystal panel is in contact with the frame through the incident side polarizing plate and is in contact with the dichroic prism through the output side polarizing plate. However, the liquid crystal panel is not necessarily in contact with the frame and dichroic through the polarizing plate. There is no need to be in contact with the prism, and as shown in FIG. 2B, the liquid crystal panel may be in contact with only the frame through the incident side polarizing plate and not in contact with the dichroic prism.
However, the amount of heat generated in the liquid crystal panel can be released more when the liquid crystal panel is in contact with both the frame body and the dichroic prism through the polarizing plate than when the liquid crystal panel is in contact with the frame body only through the polarizing plate. The liquid crystal panel is preferably in contact with both the frame and the dichroic prism via a polarizing plate.

  Here, the material constituting the frame body is sufficient if it is a light-transmitting material capable of allowing the light emitted from the light source to reach the liquid crystal panel, and is not necessarily made of transparent glass such as quartz. A permeable material may be used. However, a material with high thermal conductivity is desirable so that the amount of heat generated in the liquid crystal panel can be efficiently released to the frame, and it is resistant to light deterioration even when irradiated with intense light from a light source. Because the material is desired, the frame is made of transparent glass such as quartz, which satisfies these conditions, and transparent plastic such as polymethyl metal acrylate, transparent acrylonitrile-butadiene-styrene resin, and polycarbonate. Is preferred.

  In the liquid crystal projector configured as described above, the light emitted from the lamp 10 is made uniform in light quantity per unit area by the fly-eye lens 11 as shown in FIG. The vibration directions are aligned, separated by a dichroic mirror into red light indicated by symbol R in FIG. 3, green light indicated by symbol G in FIG. 3, and blue light indicated by symbol B in FIG. 3, and reflected by a total reflection mirror and incident. It enters the liquid crystal panel through the side polarizing plate. The light whose polarization state has been changed by the liquid crystal panel is transmitted through the output-side polarizing plate, the red light, the green light and the blue light are combined by the dichroic prism, and further magnified by the projection lens 13 and projected onto the screen (not shown). The

  In the above-described liquid crystal projector to which the present invention is applied, the amount of heat generated in each liquid crystal panel can be released to the frame through the incident side polarizing plate and can be released to the dichroic prism through the outgoing side polarizing plate. Therefore, the temperature difference for each liquid crystal panel caused by the difference in energy of red light, green light, and blue light can be reduced, and the display image quality can be improved.

  In addition, since the amount of heat generated in the liquid crystal panel can be released to the frame and the dichroic prism, it is possible to improve the cooling efficiency that has not been adequately dealt with with the downsizing of the liquid crystal projector.

  Further, in the liquid crystal projector to which the present invention is applied, when cooling by the air cooling method, as shown in FIG. 4, air is blown to the entire liquid crystal panel, frame and dichroic prism formed integrally by the fan 14. The liquid crystal panel surface is bonded to the frame and the dichroic prism via a polarizing plate, and air does not directly hit the liquid crystal panel surface during cooling. Even if dust such as dust or dust floats in the air used, the dust does not adhere to the surface of the liquid crystal panel. Therefore, dust is not projected as a shadow on the projected image.

  Further, in a general three-plate type liquid crystal projector, dust-proof glass is bonded to the surface of each liquid crystal panel as a measure against dust adhering to the surface of the liquid crystal panel. However, in the liquid crystal projector to which the present invention is applied, the liquid crystal panel surface is a polarizing plate. Since the frame and the dichroic prism are bonded to each other, dust-proof glass is not required, and material costs can be reduced.

It is a schematic diagram for demonstrating the liquid crystal projector to which this invention is applied. It is a schematic diagram for demonstrating the modification of the liquid crystal projector to which this invention is applied. It is a top view for demonstrating the liquid crystal projector to which this invention is applied. It is a schematic diagram for demonstrating the cooling method of the liquid crystal projector to which this invention is applied. It is a schematic diagram for demonstrating the conventional liquid crystal projector. It is a schematic diagram for demonstrating the cooling method of the conventional liquid crystal projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Liquid crystal panel 3 Dichroic mirror 4 Total reflection mirror 5 Frame 6 Dichroic prism 7 Incident side polarizing plate 8 Outgoing side polarizing plate 9 Space | gap part 10 Lamp 11 Fly eye lens 12 PS isolation | separation synthetic | combination plate 13 Projection lens 14 Fan

Claims (5)

A frame for guiding light from a light source to a display panel in contact with a polarizing plate,
A plurality of spectral plates for separating light from the light source into three color lights;
A reflective plate that reflects the color light separated by the spectral plate;
While the polarizing plate is in contact with the frame,
The said spectroscopic plate and the said reflecting plate are integrated with the light transmissive material. The frame characterized by the above-mentioned. A plurality of spectral plates for separating light from the light source into three color lights, and a reflective plate for reflecting the color light separated by the spectral plates, wherein the spectral plate and the reflective plate are integrated by a light-transmitting material; A frame and
A plurality of display panels in which light from a light source is guided through the polarizing plate by the frame;
A display device comprising a prism that combines color light emitted from each display panel,
The display device, wherein the polarizing plate is in contact with the frame. The display device according to claim 2, wherein the display panel is in contact with the frame body and the prism via a polarizing plate. The display device according to claim 2, wherein the light transmissive material is a material having thermal conductivity. The display device according to claim 2, wherein the light-transmitting material is a light-resistant deterioration material.

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