JP2008129234A - Mounting case, electro-optical device and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain excellent heat radiation effect without making a shape complicated, to eliminate the need to readjust the image center of an electrooptical panel after assembly, and also to obtain high reliability. <P>SOLUTION: An electrooptical apparatus incorporated in a liquid crystal projector 100 has a light valve 110 and a mounting case body 40 wherein the light valve 110 is mounted, and the mounting case body 40 is formed of a ceramic material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mounting case for mounting an electro-optical panel, an electro-optical device including the mounting case, and an electronic apparatus including the electro-optical device.

  As is well known, for example, when a liquid crystal panel, which is representative of an electro-optical panel, is used as a light valve incorporated in an electronic apparatus such as a projection display device, the light valve is not provided with a mounting portion. As disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2005-250506) and Patent Document 2 (Japanese Patent Laid-Open No. 2006-171565), a light valve is mounted on a mounting case, and the light flux passes through the mounting case. It is fixed to the incident end face.

  By the way, recent projection type display devices have a strong demand for higher brightness and higher resolution of projected images, and in order to meet these demands, there is a tendency to employ a high output lamp as a light source lamp. A halogen lamp is known as this light source lamp. A light source lamp typified by this halogen lamp can obtain high-luminance light, but emits intense heat rays from the lamp. Therefore, when the output of the light source lamp is increased, the temperature of the liquid crystal panel is easily increased by the heat rays emitted from the lamp, which adversely affects display characteristics and durability.

As a countermeasure against this, in Patent Document 2 described above, a mounting case for mounting a liquid crystal panel is formed using a metal material such as an aluminum alloy having good thermal conductivity, and the mounting case is arranged along the flow of cooling air. In addition, the mounting case is formed on the outer surface of the mounting case to form a wind guide portion and a blade portion that rectifies the cooling air, thereby efficiently cooling the mounting case, and the heat of the liquid crystal panel mounted on the mounting case. It discharges to the outside through the mounting case.
JP 2005-250506 A Japanese Patent Laid-Open No. 2006-171656

  However, there is a limit to only the cooling structure of the mounting case in order to cope with the higher output of the light source lamp, and when trying to obtain a higher cooling effect, the shape becomes complicated and manufacturing becomes difficult. There is an inconvenience.

  On the other hand, if the material of the mounting case is made of a metal material such as an aluminum alloy or a magnesium alloy having a high thermal conductivity to improve heat dissipation, this metal material has a higher coefficient of thermal expansion than the liquid crystal panel. Due to the difference in thermal expansion between the mounting case and the liquid crystal panel, the liquid crystal panel moves relative to the mounting case.

  That is, if the mounting case repeats thermal expansion due to lighting of the light source lamp and thermal contraction due to extinction, the liquid crystal panel fixed to the mounting case via an adhesive causes a displacement, and the image center of the liquid crystal panel is shifted. Will shift over time. As a result, it is necessary to readjust the center of the image after alignment at the time of assembly, which not only requires complicated work, but also has a problem that the reliability of the product is impaired.

  In view of the above circumstances, the present invention can not only obtain a good heat dissipation effect without complicating the shape, but also does not significantly expand even under the influence of heat rays from the light source lamp. It is not necessary to readjust the image center of the electro-optical panel after assembly, and it is possible to extend the life of the product and to provide a mounting case, electro-optical device, and electronic apparatus that can obtain high reliability. Objective.

  In order to achieve the above object, a mounting case according to the present invention has a mounting case body on which an electro-optic panel is mounted, and the mounting case body is formed using a ceramic material.

  In such a configuration, the mounting case body is made of a ceramic material, so a good heat dissipation effect can be obtained without complicating the shape, and the temperature rise of the electro-optic panel mounted on the mounting case body is suppressed. can do.

  A first electro-optical device according to the present invention includes an electro-optical panel and a mounting case main body for mounting the electro-optical panel, and the mounting case main body is formed using a ceramic material.

  In such a configuration, since the mounting case body is formed using a ceramic material, a good heat dissipation effect can be obtained without complicating the shape, and the temperature of the electro-optical panel mounted on the mounting case body can be increased. It can be suppressed and the product life can be extended.

  The second electro-optical device according to the present invention is characterized in that, in the first electro-optical device, the electro-optical panel is bonded and fixed to the mounting case main body via a heat conductive adhesive.

  In such a configuration, since the electro-optical panel is bonded and fixed to the mounting case body via the heat conductive adhesive, the heat of the electro-optical panel is efficiently radiated to the mounting case body via the heat conductive adhesive. The temperature rise of the electro-optical panel can be further suppressed, and the product life can be extended.

  The electronic apparatus according to the present invention includes the first or second electro-optical device.

  In such a configuration, since the mounting case main body constituting the electro-optical device is formed using a ceramic material, the mounting case main body is irradiated with heat rays from the light source lamp provided in the electronic device and heated. However, since the thermal expansion coefficient of the mounting case is low, the difference in thermal expansion between the mounting case main body and the electro-optical panel is small. Therefore, the mounting case and the electro-optical panel mounted on the mounting case are The relative position becomes difficult to shift, and it is not necessary to readjust the center of the image after alignment at the time of assembly, so that high reliability can be obtained.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of an electro-optical device including a mounting case and a light valve, FIG. 2 is a perspective view of a state in which the mounting case is attached to a dichroic prism, and FIG. 3 is a schematic diagram of a color liquid crystal projector device.

  First, the configuration of a color liquid crystal projector unit, which is an example of a projection display device, will be briefly described with reference to FIG. This color liquid crystal projector unit includes a liquid crystal projector 100 which is an example of an electronic device, and a screen 120. The liquid crystal projector 100 includes light valves 110R, 110G, and 110B as three electro-optical panels that modulate the color light beams R, G, and B.

  In this liquid crystal projector 100, light projected from a light source lamp 102 having a white light source such as a metal halide lamp is converted into light components R, G, and B corresponding to three primary colors by three mirrors 106 and two dichroic mirrors 108. The light is split and guided to the light valves 110R, 110G, and 110B, which modulate the color according to the image information. At that time, in particular, the B light is guided through a relay lens system 121 including an incident lens 122, a relay lens 123, and an exit lens 124 in order to prevent light loss due to a long optical path. The light components corresponding to the three primary colors modulated by the respective light valves 110R, 110G, and 110B are synthesized again by the dichroic prism 111 as a color synthesis optical device, and then the projection lens 114 is passed through the projection lens 114. A color image is projected on a screen 120 that faces the screen. Since each light valve 110R, 110G, 110B has the same configuration, in the following, these will be collectively referred to as the light valve 110 and will be described collectively.

  As shown in FIG. 1, the light valve 110 is affixed to a liquid crystal panel 130 as a substantially rectangular electro-optical panel, and in close contact with a light beam incident side and a light beam emission side of the liquid crystal panel 130. Dust-proof glass 131 and 132. In the liquid crystal panel 130, the TFT substrate 133 and the counter substrate 134 are arranged to face each other via a sealing material (not shown), and liquid crystal (electrical) is sealed in a space sealed by the sealing material between the substrates 133 and 134. Optical material) is enclosed. Reference numeral 136 denotes a flexible connector connected to an external circuit connection terminal (not shown).

  The light valve 110 is housed and held in the mounting case 30, and the light valve 110 and the mounting case 30 constitute an electro-optical device. As shown in FIG. 2, the mounting case 30 is fixed in a state in which the mounting case 30 is in contact with the light incident surface of the dichroic prism 111 via a fixing plate 113. The fixed plate 113 holds a known exit side polarizing plate (not shown).

  The mounting case 30 includes a mounting case body 40 that houses and holds the light valve 110, and a frame-like member 60 that engages with the mounting case body 40 and presses and fixes the light valve 110 housed therein. . The frame-like member 60 is made of a sheet metal formed by processing a flat plate, hooks 62 are bent on both sides of the frame-like member 60, and a hook engaging portion 40a to which the hook 62 is engaged is mounted. It is formed on the side surface of the case body 40.

  The mounting case main body 40 is a ceramic sintered body formed by sintering a ceramic material, and has a low thermal expansion coefficient and a relatively high thermal conductivity, and thus has excellent heat dissipation. Examples of the ceramic material include an alumina sintered body, an aluminum nitride sintered body, a mullite sintered body, a silicon carbide sintered body, a silicon nitride sintered body, and a glass ceramic sintered body.

  Screw insertion holes 40 b are formed in the four corners of the mounting case body 40, and a housing portion 41 for housing the light valve 110 is formed inside the mounting case body 40. Further, a cutout portion 44 for extending the flexible connector 136 to the outside is formed on one side of the housing portion 41. In addition, an incident window 41a for receiving projection light from the light source lamp 102 is opened on the light beam incident side of the housing portion 41.

  The light valve 110 mounted in the housing part 41 of the mounting case body 40 is positioned in a predetermined manner via an adhesive such as a photo-curing adhesive filled between the side surface and the wall surface of the housing part 41. It is bonded and fixed in the state. In addition, if a heat conductive adhesive is used as this adhesive, the heat of the light valve 110 can be more efficiently radiated to the mounting case body 40 via the heat conductive adhesive.

  Further, a frame-shaped member 60 is brought into contact with the outer surface of the dust-proof glass 131 attached to the TFT substrate 133 side of the mounting case body 40, and hooks 62 formed by bending on both sides of the frame-shaped member 60 are provided. The outer edge portion of the surface of the dust-proof glass 131 is held and fixed by being engaged with a hook engaging portion 40 a formed on the side surface of the mounting case main body 40.

  The mounting case 30 is in contact with the fixed plate 113 on the frame-like member 60 side. Therefore, the outer surface of the mounting case main body 40 is opposed to the light beam incident side. Further, since the mounting case body 40 according to the present embodiment is made of ceramics and has a low coefficient of thermal expansion, the difference in thermal expansion between the mounting case body 40 and the light valve 110 mounted on the mounting case body 40 is small. The gap between the inner wall of the housing part 41 and the outer periphery of the light valve 110 does not change greatly due to the temperature change, and the light valve 110 is held and fixed in the housing part 41 in a stable state. Can do.

  Next, the operation of the present embodiment having such a configuration will be described. As shown in FIG. 3, in the liquid crystal projector 100, when projection light is emitted from the light source lamp 102, the projection light is light corresponding to the three primary colors of RGB by the three mirrors 106 and the two dichroic mirrors 108. The light is split into components R, G, and B, and guided to the corresponding light valve 110 (110R, 100G, and 100B) for each color. The light components corresponding to the three primary colors modulated by the light valves 110 (110R, 100G, and 100B) are synthesized again by the dichroic prism 111 and then projected as a color image on the screen 120 via the projection lens 114. The

  A heat ray is emitted from the light source lamp 102 together with light. The mounting case 30 holding the light valve 110 is heated by the heat rays emitted from the light source lamp 102 because the mounting case body 40 side faces the light beam incident side.

  Since the mounting case main body 40 is made of ceramics having a low thermal expansion coefficient, it does not expand greatly even when heated by the heat rays emitted from the light source lamp 102. Therefore, the difference in thermal expansion between the light valve 110 and the mounting case main body 40 on which the light valve 110 is mounted is always small, and the light valve 110 fixed to the housing portion 41 via the adhesive is within the mounting case main body 40. It is difficult to cause misalignment. As a result, the image center of the light valve 110 can be fixed at a stable position for a long period of time, and the work of readjusting the image center after alignment during assembly becomes unnecessary, improving the quality and reliability of the product. it can.

  Moreover, since the mounting case main body 40 is made of ceramics, the thermal conductivity is good, and a good heat dissipation effect can be obtained. As a result, the temperature rise of the light valve 110 can be suppressed, and the product life can be extended. In this case, the light valve 110 can be radiated more efficiently by adhering the light valve 110 to the housing portion 41 of the mounting case body 40 via a heat conductive adhesive.

  Furthermore, since the mounting case main body 40 itself has high thermal conductivity, it is not necessary to form a heat dissipation structure such as a heat dissipation fin in the mounting case main body 40, and the simplification of the shape can be realized. Cost can be reduced.

  Further, by using translucent YAG (yttrium, aluminum, garnet) ceramic for the dustproof glasses 131 and 132, further improvement in heat dissipation can be realized. That is, since the YAG ceramic has a high heat dissipation property, the temperature difference between the mounting case main body 40 and the light valve 110 can be reduced by forming the dust-proof glasses 131 and 132 in contact with the mounting case main body 40 with the YAG ceramic. It becomes.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a mounting case with such a change is also applicable. Are included in the technical scope of the present invention. The electro-optical panel can be applied not only to a liquid crystal panel but also to an electrophoresis device, an EL (electroluminescence) device, and the like.

  Furthermore, the electronic apparatus is not limited to the above-described liquid crystal projector 100 as long as it can be realized by including the electro-optical device according to the present invention, but is a television receiver, a viewfinder type or a monitor direct-view type video tape recorder, a car navigation system. The present invention can be applied to various electronic devices such as a device, a pager, an electronic notebook, a calculator, a word processor, a workstation, a video phone, a POS terminal, and a device having a touch panel.

An exploded perspective view of an electro-optical device comprising a mounting case and a light valve Perspective view of the mounting case attached to the dichroic prism It is a schematic diagram of a color liquid crystal projector apparatus.

Explanation of symbols

  30 ... Mounting case, 40 ... Mounting case body, 100 ... Liquid crystal projector, 110 ... Light valve, 130 ... Liquid crystal panel

Claims (4)

A mounting case body for mounting the electro-optic panel;
A mounting case, wherein the mounting case body is formed of a ceramic material. An electro-optical panel, and a mounting case body for mounting the electro-optical panel;
An electro-optical device, wherein the mounting case body is formed using a ceramic material. 3. The electro-optical device according to claim 2, wherein the electro-optical panel is bonded and fixed to the mounting case main body via a heat conductive adhesive. An electronic apparatus comprising the electro-optical device according to claim 2.

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