JP2008153915A - Electrooptical device module and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cool a liquid crystal light valve provided in a liquid crystal light valve, for instance. <P>SOLUTION: A Peltier element 510 is disposed in a peripheral region extending in the periphery of an image display region 10a of the surface of a substrate 400 for dustproofing and driven by power generated in a solar battery element 530 when the liquid crystal light valve 100G is operated and a liquid crystal panel 500 is cooled. Thus, by the Peltier element 510, the temperature rise of the liquid crystal panel 500 caused by strong incident light made incident on the liquid crystal light valve 100G can be suppressed, and the display performance of the liquid crystal panel 500 is maintained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technical field of an electro-optical device module applied to, for example, a light valve of a projection display device such as a liquid crystal projector, and an electronic apparatus such as a projection display device.

  In a liquid crystal panel used in this type of electro-optical device module, a liquid crystal layer is sealed between a pair of substrates arranged so as to face each other, and a display region in which image display is performed is formed by driving the liquid crystal layer. . When a liquid crystal panel is used as a light valve for a liquid crystal projector or the like, it is not installed in a so-called naked state in a casing, casing or frame of a device, but is usually mounted or accommodated in a suitable mounting case. Installed at. The mounting of an electro-optical panel such as a liquid crystal panel in a mounting case is primarily performed by fixing and attaching the electro-optical panel to a housing or the like by providing an appropriate screw hole or the like in the mounting case. Alternatively, optical positioning can be easily performed.

  In order to perform an enlarged projection on the screen, a strong light source light is incident on such a liquid crystal light valve while being condensed from the light source. When such strong light source light is incident, the temperature of the liquid crystal panel rises, and the temperature of the liquid crystal sandwiched between the pair of transparent substrates in the liquid crystal panel also rises, leading to deterioration of the characteristics of the liquid crystal. As an example of means for solving such a problem, Patent Document 1 discloses a liquid crystal projector airflow system including a fan for suppressing a temperature rise of a liquid crystal panel.

JP-A-4-60534

  However, according to the technique disclosed in Patent Document 1, since a power source for driving the fan is required, there is a problem that the power consumption of the liquid crystal projector increases. In particular, an electro-optical device used for a light valve has an advantage in that power consumption during operation is small. Therefore, power for cooling an electro-optical device such as a liquid crystal device is separated from power for displaying an image. If it becomes necessary, the advantage is not fully exhibited.

  Therefore, the present invention has been made in view of the above-described problems. For example, an electro-optical device module capable of cooling an electro-optical device such as a liquid crystal device without increasing power consumption, and such It is an object of the present invention to provide an electronic apparatus such as a liquid crystal projector including an electro-optical device module.

  In order to solve the above problems, an electro-optical device module according to the present invention is formed in an electro-optical device and a peripheral region extending around a display region on the electro-optical device, and is configured to transmit light incident on the peripheral region. And a cooling element driven by light energy.

  According to the electro-optical device module of the present invention, the electro-optical device can display an image by controlling the alignment state of the liquid crystal sandwiched between the TFT array substrate and the counter substrate according to an image signal, for example. Device.

  The first cooling element is formed in a peripheral region extending around a display region in which a plurality of pixel portions are arranged, and light energy of light incident on the peripheral region out of light emitted from an optical system such as a light source Driven by. Therefore, the light incident on the electro-optical device does not substantially contribute to the image display, and can be used for driving the cooling element without wasting the light energy of the light incident on the peripheral region. is there. In particular, when the electro-optical device module is applied to a light valve, it can be used for cooling the electro-optical device without wasting light energy of strong light incident on the light valve. A decrease in display performance of the electro-optical device module due to a temperature rise can be suppressed without increasing the power consumption consumed during operation.

  Since the first cooling element is formed in the peripheral area, the light incident on the display area is not blocked, and the display performance of the electro-optical device module is not deteriorated by providing the first cooling element.

  In one aspect of the electro-optical device module according to the present invention, the electro-optical device module includes a conversion element that is formed in the peripheral region and converts the light energy into electric energy, and the first cooling element is supplied from the conversion element. It may be driven by electrical energy.

  According to this aspect, the conversion element is a semiconductor element such as a solar cell that can convert light energy into electric energy, and the first cooling element is driven by the electric energy supplied from the conversion element. For example, when an electronic element such as a Peltier element is used as the first cooling element, there is an advantage that no noise is generated.

  In this aspect, the first cooling element and the conversion element may be arranged so as not to overlap each other in the peripheral region.

  According to this aspect, for example, even when the first cooling element is disposed on the light source side with respect to the conversion element such as a solar cell, the first cooling element does not block light incident on the conversion element. Light energy of incident light in the peripheral region can be efficiently converted into electric energy. Therefore, light energy that does not contribute to image display out of light incident on the electro-optical device can be converted into electric energy for cooling the electro-optical device and used to display an image. The energy supplied to can be used effectively.

  In another aspect of the electro-optical device module according to the present invention, a protective substrate disposed on the electro-optical device and protecting the electro-optical device, and the electro-optical device and the protective substrate from the periphery of the electro-optical device The cooling element may be provided on the protective substrate.

  According to this aspect, the protective substrate is a dust-proof substrate arranged to prevent foreign matters such as dust from adhering to the surface of the electro-optical device. According to such a protective substrate, it is possible to prevent foreign matters such as dust from forming an image on the projection curtain during operation of a projector including the electro-optical device module as a light valve, for example. The frame portion is formed of a metal material such as aluminum die casting, for example, and accommodates the electro-optical device and the protective substrate.

  According to this aspect, since the cooling element is provided on the protective substrate, the cooling efficiency for cooling the electro-optical device can be increased as compared with the case where the cooling element is provided in the frame portion. More specifically, by providing the cooling element on the protective substrate disposed closer to the electro-optical device than the frame part, it is possible to increase the cooling efficiency compared to the case where the cooling element is provided in the frame part. .

  In this aspect, the frame portion may be formed of a material having a higher thermal conductivity than the protective substrate.

  According to this aspect, for example, by configuring the frame portion using a metal material such as an aluminum die cast having a higher thermal conductivity than a protective substrate that is a transparent substrate such as a glass substrate, heat dissipation efficiency that releases heat from the electro-optical device is achieved. It is possible to increase.

  In another aspect of the electro-optical device module according to the present invention, the conversion element may be disposed on a surface facing the light source in the surface of the frame portion.

  According to this aspect, for example, even when the frame portion is made of a non-transparent material such as a metal material, the light emitted from the light source can be incident on the conversion element.

  In another aspect of the electro-optical device module according to the present invention, the conversion element is provided on the protective substrate, and the light is incident on the conversion element through a hole passing through the frame part. Good.

  According to this aspect, even when light is blocked by the frame portion, it is possible to make the light enter the conversion element through the hole.

  In this aspect, the protective substrate may be a semiconductor substrate, and the conversion element may be a semiconductor element formed using a portion of the semiconductor substrate that extends to the peripheral region.

  According to this aspect, a conversion element such as a solar cell can be formed using a semiconductor substrate such as a silicon substrate. According to such a conversion element, light is incident through the hole formed in the frame part, and thus it is possible to generate electric energy for driving the cooling element.

  In another aspect of the electro-optical device module according to the present invention, a connection substrate that electrically connects the electro-optical device and an external circuit, and various types that are provided on the connection substrate and are to be supplied to the electro-optical device. You may provide the processing circuit part which performs signal processing of a signal, and the 2nd cooling element provided in the said connection board | substrate and driven by the said electrical energy.

  According to this aspect, the connection board is, for example, an FPC board (flexible printed board) that electrically connects the electro-optical device and the external circuit to each other, and the processing circuit unit is a drive IC mounted on the FPC board. is there. Since the operation performance of the processing circuit unit such as the drive IC is deteriorated due to heat, the heat transmitted from the electro-optical device during the operation of the electro-optical device is more efficiently exhausted in order to maintain the operation performance of the drive IC. Is preferred. Therefore, in this aspect, by providing the connection substrate with a second cooling element such as a Peltier element that is driven by the electrical energy generated by the conversion element, the temperature rise of the processing circuit unit can be reduced. According to such a second cooling element, the operation performance of the processing circuit unit such as the drive IC can be maintained, and the display performance of the electro-optical device can be maintained.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device module of the present invention.

  According to the electronic apparatus according to the present invention, since the electro-optical device module according to the present invention described above is included, a projection display device, a mobile phone, an electronic notebook, a word processor, and a viewfinder capable of high-quality display. Various electronic devices such as a video tape recorder, a workstation, a videophone, a POS terminal, and a touch panel can be realized. In addition, as an electronic apparatus according to the present invention, for example, an electrophoretic device such as electronic paper can be realized.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, embodiments of an electro-optical device module and an electronic apparatus according to the invention will be described with reference to the drawings.

<1: Electronic equipment>
First, with reference to FIG. 1, the configuration of a projector that is an embodiment of an electronic apparatus according to the invention will be described. The projector according to the present embodiment is a projection type liquid crystal device, and here, an explanation will be given focusing on an optical system incorporated in the optical unit. FIG. 1 is a schematic cross-sectional view of a projector according to the present embodiment. The projector according to the present embodiment is constructed as a multi-plate color projector in which three liquid crystal light valves, which are examples of the “electro-optical device module” according to the present invention, are used as a set.

  In FIG. 1, a liquid crystal projector 1100, which is an example of a double-plate type color projector in the present embodiment, prepares three liquid crystal light valves including an electro-optical device having a drive circuit mounted on a TFT array substrate, each for RGB. The projector is configured as a liquid crystal light valve 100R, 100G, or 100B. In the liquid crystal projector 1100, when projection light is emitted from a lamp unit 1102 of a white light source such as a metal halide lamp, light components R, G, and R corresponding to the three primary colors of RGB are obtained by three mirrors 1106 and two dichroic mirrors 1108. The liquid crystal light valves 100R, 100G, and 100B corresponding to the respective colors are respectively guided to B. At this time, in particular, the B light is guided through a relay lens system 1121 including an incident lens 1122, a relay lens 1123, and an exit lens 1124 in order to prevent light loss due to a long optical path. Light components corresponding to the three primary colors modulated by the liquid crystal light valves 100R, 100G, and 100B are synthesized again by the dichroic prism 1112 and then projected as a color image on the screen via the projection lens 1114.

  The liquid crystal light valves 100R, 100G, and 100B include, for example, an active matrix drive type liquid crystal panel that uses TFTs as switching elements as described below.

  When the liquid crystal projector 1100 is driven, the temperature of the liquid crystal light valves 100R, 100G, and 100B rises due to the projection light from the lamp unit 1102, which is a powerful light source. At this time, if the temperature rises excessively, the liquid crystal in the liquid crystal light valves 100R, 100G, and 100B deteriorates, or the transmittance varies due to the appearance of hot spots due to partial heating of the liquid crystal panel due to unevenness of the light source light. To do. In particular, in the liquid crystal panel provided in the liquid crystal light valve 100G that modulates green light, the non-uniformity in transmittance occurs significantly.

  Therefore, in the present embodiment, the liquid crystal light valve 100G is configured as follows to efficiently suppress the temperature rise.

<2: Electro-optical device module>
<2-1: Configuration of electro-optical device>
Next, a specific configuration of a liquid crystal light valve that is an example of an electro-optical device module included in the projector according to the present embodiment will be described with reference to FIGS. 2 to 9. The liquid crystal light valve 100 is an example of the “electro-optical device” of the present invention, and a liquid crystal panel which is a main body of the liquid crystal light valve is accommodated in a mounting case. The liquid crystal panel 100 is used as each of the liquid crystal light valves 100R, 100G, and 100B in the liquid crystal projector 1100 described above.

  A specific configuration of the liquid crystal panel will be described with reference to FIGS. Here, an example of a liquid crystal device of a TFT active matrix driving method with a built-in driving circuit, which is an example of a liquid crystal panel, is given. FIG. 2 is a plan view of the liquid crystal panel when the TFT array substrate is viewed from the counter substrate side together with each component formed thereon, and FIG. 3 is a cross-sectional view taken along the line III-III ′ of FIG.

  2 and 3, in the liquid crystal panel 500, the TFT array substrate 10 and the counter substrate 20 are arranged to face each other. A liquid crystal layer 50 is sealed between the TFT array substrate 10 and the counter substrate 20, and the TFT array substrate 10 and the counter substrate 20 are sealed regions located around the image display region 10a in which a plurality of pixels are arranged. Are adhered to each other by a sealing material 52 provided on the surface.

  The sealing material 52 is made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like for bonding the two substrates, and is applied on the TFT array substrate 10 in the manufacturing process and then cured by ultraviolet irradiation, heating, or the like. It is. In the sealing material 52, a gap material such as glass fiber or glass beads for dispersing the distance between the TFT array substrate 10 and the counter substrate 20 (inter-substrate gap) to a predetermined value is dispersed. Therefore, the liquid crystal panel 500 is small and suitable for performing enlarged display for a light valve of a projector.

  In parallel with the inside of the seal area where the seal material 52 is disposed, a light-shielding frame light-shielding film 53 that defines the frame area of the image display area 10a, which is a typical example of the “display area” of the present invention, is provided on the counter substrate 20. On the side. However, part or all of the frame light shielding film 53 may be provided as a built-in light shielding film on the TFT array substrate 10 side.

  Of the peripheral area extending around the image display area 10 a, the data line driving circuit 101 and the external circuit connection terminal 102 are located on one side of the TFT array substrate 10 in the area located outside the seal area where the sealing material 52 is disposed. It is provided along. The sampling circuit 7 is provided so as to be covered with the frame light shielding film 53 on the inner side of the seal region along the one side. The scanning line driving circuit 104 is provided along two sides adjacent to the one side so as to be covered with the frame light shielding film 53.

  On the TFT array substrate 10, vertical conduction terminals 106 for connecting the two substrates with the vertical conduction material 107 are arranged in regions facing the four corner portions of the counter substrate 20. With these vertical conduction terminals 106, electrical conduction can be established between the TFT array substrate 10 and the counter substrate 20.

  On the TFT array substrate 10, a lead wiring 90 is formed for electrically connecting the external circuit connection terminal 102 to the data line driving circuit 101, the scanning line driving circuit 104, the vertical conduction terminal 106, and the like. .

  In FIG. 3, on the TFT array substrate 10, an alignment film (not shown) is formed on the pixel electrode 9a after the pixel switching TFT, the scanning line, the data line and the like are formed. On the other hand, on the counter substrate 20, in addition to the counter electrode 21, a lattice-shaped or striped light-shielding film 23 and an alignment film (not shown) are formed in the uppermost layer portion. Further, the liquid crystal layer 50 is made of, for example, a liquid crystal in which one or several types of nematic liquid crystals are mixed, and takes a predetermined alignment state between the pair of alignment films.

  2 and 3, in addition to the data line driving circuit 101, the scanning line driving circuit 104, etc., a precharge signal having a predetermined voltage level is applied to a plurality of data lines. A precharge circuit to be supplied in advance of each signal, an inspection circuit for inspecting the quality, defects, etc. of the electro-optical device during manufacture or at the time of shipment may be formed.

<2-2: Circuit Configuration and Operation of Electro-Optical Device>
Next, the circuit configuration and operation of the liquid crystal panel 500 will be described with reference to FIG. FIG. 4 is an equivalent circuit diagram of various elements, wirings, and the like in a plurality of pixels formed in a matrix that forms the image display region 10a of the liquid crystal panel 500.

  In FIG. 4, each of a plurality of pixels formed in a matrix forming the image display region 10 a of the liquid crystal panel 500 includes a pixel electrode 9 a and a TFT 30 for switching control of a voltage applied to the pixel electrode 9 a. The data line 6 a formed and supplied with an image signal is electrically connected to the source of the TFT 30. The image signals S1, S2,..., Sn to be written to the data lines 6a may be supplied line-sequentially in this order, or may be supplied for each group to a plurality of adjacent data lines 6a. May be.

  The gate electrode 3a is electrically connected to the gate of the TFT 30, and the scanning signals G1, G2,..., Gm are pulse-sequentially applied in this order to the scanning line 11a and the gate electrode 3a at a predetermined timing. The liquid crystal panel 500 is configured to apply. The pixel electrode 9a is electrically connected to the drain of the TFT 30, and the image signal S1, S2,... Supplied from the data line 6a is closed by closing the switch of the TFT 30 serving as a switching element for a certain period. Sn is written at a predetermined timing.

  A predetermined level of the image signals S1, S2,..., Sn written in the liquid crystal as an example of the electro-optical material via the pixel electrode 9a is between the counter electrode 21 formed on the counter substrate 20 for a certain period. Retained. The liquid crystal modulates light and enables gradation display by changing the orientation and order of the molecular assembly depending on the applied voltage level. In the normally white mode, the transmittance for incident light is reduced according to the voltage applied in units of each pixel, and in the normally black mode, the light is incident according to the voltage applied in units of each pixel. The light transmittance is increased, and light having a contrast corresponding to the image signal is emitted from the liquid crystal panel 500 as a whole.

  In order to prevent the image signal held here from leaking, a holding capacitor 70 is added in parallel with the liquid crystal capacitor formed between the pixel electrode 9 a and the counter electrode 21. The storage capacitor 70 is provided side by side along the scanning line 11a, and includes a capacitor electrode 300 including a fixed potential side capacitor electrode and fixed at a constant potential.

<2-3: Specific Configuration of Electro-Optical Device Module>
Next, a specific configuration of the liquid crystal light valve 100G in which the liquid crystal panel 500 is housed in the mounting case 601 will be described with reference to FIGS. In the present embodiment, the liquid crystal light valve 100G will be mainly described in detail. The liquid crystal light valves 100R and 100B may have the same configuration as the liquid crystal light valve 100G.

  FIG. 5 is an exploded perspective view of the liquid crystal light valve 100G. FIG. 6 is a plan view of the liquid crystal light valve 100G. FIG. 7 is a side view of the liquid crystal light valve 100G viewed from the direction of the arrow X in FIG.

  In FIG. 5, a liquid crystal light valve 100G includes a liquid crystal panel 500, a dustproof substrate 400 that is an example of the “protective substrate” of the present invention, a mounting case 601, and a flexible printed wiring board that is an example of the “connection substrate” of the present invention. (Hereinafter abbreviated as FPC) 501, one side of the FPC board 501, the driving IC 502 which is an example of the “processing circuit unit” of the present invention, and the “first cooling element” of the present invention. The Peltier element 510 which is an example of the solar cell element 530 which is an example of the “conversion element” of the present invention.

  An external circuit connection terminal 102 (see FIG. 1) included in the liquid crystal panel 500 is electrically connected to the FPC 501, and an image signal or the like processed by the driving IC 502 is supplied to the liquid crystal panel 500.

  The dustproof substrate 400 is disposed on the opposite surface of the TFT array substrate 10 and the counter substrate 20 with the liquid crystal layer 50 interposed therebetween. According to the dustproof substrate 400, the image formation point where the foreign matter is imaged can be shifted from the projection curtain so that the foreign matter such as dust attached to the TFT array substrate 10 or the counter substrate 20 is not imaged on the projection curtain. it can.

  An optical member such as an antireflection plate may be attached to the outer surface of the liquid crystal panel 500. However, a polarizing plate, a retardation plate, and the like may be attached to the outer surface of the liquid crystal panel 500 or may be provided as part of the optical system of the liquid crystal projector 1100.

  The mounting case 601 includes a frame 610 that is an example of the “frame portion” of the present invention that houses the liquid crystal panel 500, and a cover member 620 that covers the frame 610. The cover member 620 is combined with the frame 610 by hooking hooks 627 on both side edges to the claw portions 617 formed on the side surfaces of the frame 610.

  The liquid crystal panel 500 is accommodated in a direction in which the counter substrate 20 side faces the frame 610, and the outer surface on the TFT array substrate 10 side is covered with a cover member 620. That is, the liquid crystal light valve 100G modulates incident light that is incident from the frame 610 side when viewed from the liquid crystal panel 500, and emits the modulated light from a window provided in the cover member 620. That is, in FIG. 1, the cover member 620 is opposed to the dichroic prism 1112 instead of the frame 610.

  The frame 610 and the cover member 620 are configured using a metal material such as an aluminum die cast having a higher thermal conductivity than the dustproof glass 400 which is a transparent substrate such as a glass substrate. Therefore, during operation of the liquid crystal panel 500, it is possible to increase the heat radiation efficiency for releasing heat from the liquid crystal panel 500 so as to reduce the temperature rise of the liquid crystal panel 500.

  In FIG. 5, the liquid crystal panel 500 is fixed by being adhered to the frame 610 with an adhesive while being surrounded by the frame 610 from the peripheral edge side, and is accommodated in the frame 610. Therefore, the liquid crystal panel 500 is surrounded by the frame 610 from the peripheral side. In the state where the liquid crystal panel 500 is accommodated in the mounting case 601, the peripheral area located around the image display area 10 a in the liquid crystal panel 500 is covered with the frame 610. For this reason, the frame 610 can prevent light leakage in the peripheral area and has a light shielding function for preventing stray light from entering the image display area 10a from the peripheral area. Further, as an adhesive that adheres the liquid crystal panel 500 on which the dustproof substrate 400 is disposed to the mounting case 601, an adhesive having higher thermal conductivity than air is used, so that the temperature of the liquid crystal panel 500 is increased. Can be suppressed.

  The cover member 620 includes a frame-shaped main body in which a window portion 625 which is an opening is formed, and hooks 627 provided on both sides of the main body. The window 625 is opened to face the image display area 10a in order to take out light emitted from the image display area 10a (see FIG. 2) of the liquid crystal panel 500.

  The Peltier element 510 is disposed in a peripheral area extending around the image display area 10a on the surface of the dustproof substrate 400, and is driven by the power generated by the solar cell element 530 when the liquid crystal light valve 100G is operated. Then, the liquid crystal panel 500 is cooled. Therefore, according to the Peltier element 510, the temperature rise of the liquid crystal panel 500 due to the strong incident light incident on the liquid crystal light valve 100G can be suppressed, and the display performance of the liquid crystal panel 500 is maintained. Thereby, display defects such as display unevenness caused by the temperature rise of the liquid crystal panel 500 can be reduced.

  In particular, in this embodiment, since the Peltier element 510 is provided on the dustproof substrate 400, the liquid crystal panel 500 is cooled compared to the case where the Peltier elements are arranged on the frame 610 and the cover member 620 constituting the mounting case 601. It is possible to increase the cooling efficiency. That is, by providing the Peltier element 510 on the dust-proof substrate 400 arranged closer to the liquid crystal panel 500 than the frame 610 or the cover member 620, cooling is performed as compared with the case where the Peltier element 510 is provided on the frame 610 or the cover member 620. It is possible to increase efficiency.

  In the present embodiment, the Peltier element 510 may be directly provided on the counter substrate 20 or the TFT array substrate 10 in order to enhance the cooling effect on the liquid crystal panel 500.

  The solar cell element 530 is disposed on the surface of the frame 610 that faces the light source, that is, the surface on the side where light from the light source enters the frame 610. The solar cell element 530 generates electric power according to the light energy of light incident on the surface of the frame 610 out of the light emitted from the optical system including the light source, and the electric power is supplied to the Peltier element 510 via a wiring (not shown). To supply. According to the liquid crystal light valve 100G, the Peltier element 510 can be driven using the light energy of light incident on the peripheral area located around the image display area 10a out of the light incident on the liquid crystal light valve 100G. The light incident on 100G can be effectively used without wasting it.

  In particular, in the present embodiment, since the energy of the strong light incident on the liquid crystal light valve 100G can be used for cooling the liquid crystal panel 500 without wasting it, the power consumption consumed during the operation of the liquid crystal light valve 100G. Without increasing the liquid crystal light valve 100G due to temperature rise can be suppressed. The Peltier element 510 is formed on the surface of the frame 610 extending in a frame shape around the image display area 10a. Therefore, the Peltier element 510 is provided without blocking light incident on the image display area 10a. The display performance of the liquid crystal light valve 100G is not degraded. In addition, the Peltier element 510 has an advantage that noise is not generated during its operation.

  In the present embodiment, since the Peltier element 510 is disposed on the dustproof substrate 400 and the solar cell element 530 is disposed on the light source side surface of the surface of the frame 610, these elements overlap each other when viewed in a plan view. For example, when the frame 610 is formed of a transparent material, or when the liquid crystal panel 500 is not accommodated in the mounting case 601, the solar cell element is formed in the peripheral region of the image display region 10a. The 530 and the Peltier element 510 may be arranged so as not to overlap each other. According to such a solar cell element 530 and the Peltier element 510, even when the Peltier element 510 is disposed on the light source side with respect to the solar cell element 530, light incident on the solar cell element 530 is blocked by the Peltier element 510. The light energy of the light incident on the peripheral region can be efficiently converted into electric energy.

  In FIG. 6, the frame 610 includes a main body portion 613, a mounting portion 614, and a claw portion 617.

  The main body portion 613 includes a window portion 616 that is shaped so as to be hollowed out so as to match the shape of the liquid crystal panel 500. The window 616 is opened to face the image display area 10a in order to transmit light to the image display area 10a (see FIG. 2) of the accommodated liquid crystal panel 500. Therefore, light emitted from the lamp unit 1102 in the liquid crystal projector 1100 shown in FIG. 1 can enter the liquid crystal panel 500 through the window 616.

  The mounting portions 614 are provided at the four corners of the frame 610 (see the hatched portion rising to the right in FIG. 6), and mounting holes 615 are provided in each of the mounting portions 614. The mounting hole 615 is used when the liquid crystal light valve 100G is mounted in the liquid crystal projector 1100 as shown in FIG. That is, as shown in FIG. 7, the liquid crystal light valve 100G is mounted in the liquid crystal projector 1100 by screwing the liquid crystal light valve 100G to the liquid crystal projector 1100 using a screw 700 that passes through the mounting hole 615. Therefore, the liquid crystal panel 500 can be stably mounted in the liquid crystal projector 1100.

  Therefore, according to the frame 610, for example, it is possible to prevent the image display area 10a from being displaced with respect to the attachment position serving as the optical reference position. Furthermore, as shown in FIG. 6, in this embodiment, the mounting portion 614, in other words, the attachment holes 615 are provided at the four corners of the frame 610, thereby realizing the four-point fixing. In order to fix the liquid crystal light valve 100G in the liquid crystal projector 1100, it is preferable that at least three mounting holes are provided.

  The mounting part 614 may be made of a material having higher strength than the main body part 613. Such a mounting part 614 is formed from two types of materials different from the main body part 613, and is integrally molded by two-color molding. Therefore, the mounting portion 614 has higher mechanical strength than the main body portion 613, such as bending strength, shear strength, and compressive strength. When the mounting hole 615 provided in the mounting portion 614 is used for screwing, the mounting portion 614 may be cracked around the mounting hole 615 due to stress applied by screw tightening. It is possible to reduce or prevent the mounting portion 614 from being destroyed when it is mounted in the liquid crystal projector 1100, such as being broken. In other words, here, the above-mentioned mechanical strength is at least compressed so that the mounting portion 614 is not broken even if it is compressed by being tightened by a mounting screw when mounted on the projector optical system. It is preferable that the strength be sufficiently high with respect to the compressive force received during screw tightening.

  The mounting portion 614 can be increased in strength by being configured using, for example, a PPS-based resin to which fibers such as glass fibers and carbon fibers are added. Further, the main body 613 may be configured using, for example, a PPS-based resin to which a substance that enhances thermal conductivity, such as carbon powder, is added.

  The solar cell elements 530 are uniformly arranged on the surface of a frame-shaped frame 610 surrounding the image display region 10a. Therefore, it is possible to convert almost all of the light energy of the light incident on the peripheral area of the image display area 10a out of the light incident on the liquid crystal light valve 100G into electric energy.

  As shown in FIG. 7, in a state in which the liquid crystal light valve 100G including the liquid crystal panel 500 accommodated in the mounting case 601 is mounted on the liquid crystal projector 1100, the liquid crystal panel 500 starts from the place where the liquid crystal panel 500 is in contact with the main body 613. Conducted to part 613. Further, such heat is conducted through an adhesive interposed between the liquid crystal panel 500 and the main body 613 and is released to the liquid crystal projector 1100. Thus, the heat energy accumulated in the liquid crystal panel 500 can be radiated to the outside of the mounting case 601 through the main body 613.

  In FIG. 7, a Peltier element 520, which is an example of the “second cooling element” of the present invention, is disposed on the back side of the surface on which the driving IC 502 is disposed on the FPC board 501. The Peltier element 520 is driven by electric power supplied from the solar cell element 530 and cools the drive IC 502. More specifically, since the operation performance of the drive IC 502 decreases as the temperature rises, the temperature transmitted by the liquid crystal panel 500 to the drive IC 502 during the operation of the liquid crystal light valve 100G or the temperature rise due to light irradiation is increased. For the purpose of suppression, the Peltier element 520 cools the drive IC 502.

  As described above, according to the liquid crystal light valve 100G according to the present embodiment, the temperature increase of the liquid crystal panel 500 included in the liquid crystal light valve 100G can be suppressed during the operation of the projector 1100. In addition, according to the liquid crystal light valve 100G, the liquid crystal panel 500 can be cooled using light energy that does not contribute to image display among incident light incident on the liquid crystal light valve 100G, in other words, wasted energy. While enabling effective use of energy and reduction of power consumption in the projector 1100, a high-quality image with reduced display defects such as display unevenness can be displayed.

(Modification)
Next, a modification of the electro-optical device module according to the present embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a plan view of the electro-optical device module according to this example, and FIG. 9 is a plan view of the dustproof substrate 400a. In the following description, the same reference numerals are assigned to portions common to the above-described liquid crystal light valve 100G, and detailed description thereof is omitted.

  8 and 9, the liquid crystal light valve 100 </ b> X has a frame 610 </ b> X having a hole 550. The hole 550 penetrates the frame 610X, and is formed on the solar cell element 530a disposed in the peripheral area 10b surrounding the image display area 10a in a frame shape on the surface of the dustproof substrate 400a accommodated in the mounting case together with the liquid crystal panel. It is formed on the frame 610X so as to overlap. Therefore, light incident on the peripheral region 10b out of light incident on the liquid crystal light valve 100X from the light source enters the solar cell element 530a via the hole 550. Thereby, the solar cell element 530a can convert light energy into electric energy. The Peltier element 510a disposed on the dustproof substrate 400a is driven by power supplied from the solar cell element 530a, and can cool the liquid crystal panel. Note that the solar cell element 530a may be formed in the peripheral region 10b by forming the dustproof substrate 400a using a semiconductor substrate such as a silicon substrate.

1 is a schematic cross-sectional view of a projector according to an embodiment. FIG. 3 is a plan view of an electro-optical device included in the electro-optical device module according to the embodiment. FIG. 3 is a cross-sectional view taken along the line III-III ′ of FIG. 2. FIG. 6 is an equivalent circuit diagram of various elements, wirings, and the like in a plurality of pixels formed in a matrix that forms an image display area of an electro-optical device included in the electro-optical device module according to the embodiment. FIG. 3 is an exploded perspective view of an electro-optical device module according to the present embodiment. 2 is a plan view of an electro-optical device module according to the present embodiment. FIG. FIG. 7 is a side view of the electro-optical device module as seen from the direction of arrow X in FIG. 6. FIG. 10 is a plan view of a modification of the electro-optical device module according to the embodiment. FIG. 10 is a plan view of a dustproof substrate in a modification of the electro-optical device module according to the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... TFT array substrate, 20 ... Counter substrate, 100, 100R, 100G, 100B ... Liquid crystal light valve, 400, 400a ... Dust-proof substrate, 500 ... Liquid crystal panel, 501 ... FPC board, 510, 510a, 520 ... Peltier element, 530, 530a ... solar cell element, 550 ... hole, 1100 ... projector

Claims (10)

An electro-optic device;
An electro-optical device comprising: a first cooling element formed in a peripheral region extending around a display region on the electro-optical device, and driven by light energy of light incident on the peripheral region. module. A conversion element that is formed in the peripheral region and converts the light energy into electrical energy,
The electro-optical device module according to claim 1, wherein the first cooling element is driven by electric energy supplied from the conversion element. The electro-optical device module according to claim 2, wherein the first cooling element and the conversion element are arranged so as not to overlap each other in the peripheral region. A protective substrate that is disposed on the electro-optical device and protects the electro-optical device; and a frame portion that houses the electro-optical device and the protective substrate from the periphery of the electro-optical device;
The electro-optical device module according to claim 2, wherein the first cooling element is provided on the protective substrate. The electro-optical device module according to claim 4, wherein the frame portion is made of a material having a higher thermal conductivity than the protective substrate. 6. The electro-optical device module according to claim 4, wherein the conversion element is disposed on a surface of the frame portion facing a light source. The electro-optical device according to claim 4, wherein the conversion element is provided on the protective substrate, and the light is incident on the conversion element through a hole that penetrates the frame portion. module. The protective substrate is a semiconductor substrate;
The electro-optical device module according to claim 7, wherein the conversion element is a semiconductor element formed by using a portion of the semiconductor substrate that extends to the peripheral region. A connection board for electrically connecting the electro-optical device and an external circuit; a processing circuit unit provided on the connection board for performing signal processing of various signals to be supplied to the electro-optical device; and the connection board The electro-optical device module according to claim 2, further comprising: a second cooling element that is driven by the electric energy. An electronic apparatus comprising the electro-optical device module according to claim 1.

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