JP5181736B2 - Electro-optical device and electronic apparatus - Google Patents

Description

  The present invention relates to a technical field of an electro-optical device such as a liquid crystal device, and an electronic apparatus such as a liquid crystal projector including the electro-optical device.

  In a liquid crystal panel which is an example of this type of electro-optical device, when the liquid crystal panel is used as a light valve in a liquid crystal projector, a light valve is used to prevent a dust image from appearing in an image projected and enlarged on the screen. In many cases, a dust-proof substrate is provided to prevent adhesion of dust, dust or the like (hereinafter simply referred to as “dust”) to the surface (see, for example, Patent Document 1).

JP 2006-350291 A

  However, since powerful light is emitted from the light source in the projector, the temperature of the liquid crystal panel used as the light valve rises, which lowers the light modulation function of the liquid crystal panel and reduces its reliability. End up. Along with this, there is a problem that the display performance of the liquid crystal projector is also lowered. In order to solve such problems, when the entire dustproof substrate is made of quartz having a high thermal conductivity, there is a problem that the cost is remarkably increased as compared with the case of being made of a quartz substrate or a glass substrate. Arise.

  Therefore, the present invention has been made in view of the above problems, and for example, to provide an electro-optical device and an electronic apparatus such as a liquid crystal panel that can suppress a temperature increase during operation while suppressing an increase in component cost. Let it be an issue

In order to solve the above problems, an electro-optical device according to the present invention includes a pair of substrates that sandwich an electro-optical material, a quartz substrate that is bonded to each other on the outer surface of at least one of the pair of substrates, and A dust-proof substrate having a quartz substrate, and the quartz substrate is disposed between the quartz substrate and the one substrate, so that an end portion of the quartz substrate is exposed from a planar shape of the quartz substrate. Largely formed .
The quartz substrate is arranged such that an optical axis of the quartz substrate is parallel or orthogonal to a transmission axis of a polarizing plate arranged on the light incident side and the light emitting side of the pair of substrates.

  According to the electro-optical device according to the present invention, it is possible to suppress an increase in the component cost of the dust-proof substrate as compared with the case where the entire dust-proof substrate is made of crystal. The increase can also be suppressed. The composition of quartz and quartz is the same for SiO2, but quartz has higher crystallinity (ie, the crystal size is relatively large) compared to quartz, which is a crystalline body of SiO2, and therefore heat conduction compared to quartz. The rate is high. Therefore, according to the electro-optical device according to the present invention, it is possible to improve the heat dissipation of the electro-optical device using the dust-proof substrate, as compared with the case where the dust-proof substrate is configured only by the quartz substrate.

  Therefore, according to the electro-optical device according to the present invention, it is possible to suppress the temperature increase of the electro-optical device during the operation, and it is possible to suppress a decrease in the modulation function that the electro-optical device modulates light. In addition, an increase in component costs of the electro-optical device can be suppressed.

  In one aspect of the electro-optical device according to the present invention, the quartz substrate may be disposed at a position closer to the one substrate than the quartz substrate.

  According to this aspect, the thermal energy generated in the electro-optical device main body including the pair of substrates can be released to the outside of the electro-optical device through the quartz substrate before being accumulated on the stone English substrate. is there. Therefore, the temperature increase of the electro-optical device can be further suppressed as compared with the case where the quartz substrate is disposed closer to the electro-optical device body than the quartz substrate.

  In another aspect of the electro-optical device according to the invention, the size of the quartz substrate may be larger than the size of the quartz substrate in plan view.

  According to this aspect, the surface area from which thermal energy is released increases due to the large size of the quartz substrate, and the temperature increase of the electro-optical device can be further suppressed.

  In another aspect of the electro-optical device according to the invention, the substrate surface of the quartz substrate may extend along the optical axis of the quartz substrate.

  According to this aspect, the light transmitted through the quartz substrate can be emitted to the outside of the electro-optical device without being modulated by the quartz substrate. Therefore, according to this aspect, the quartz substrate does not have the function of the optical compensation plate, and does not deteriorate the light modulation function or the image display function of the electro-optical device.

  In another aspect of the electro-optical device according to the invention, the dustproof substrate has a refractive index between a refractive index of the quartz substrate and a refractive index of the quartz substrate, and the quartz substrate and the quartz You may have the contact bonding layer which adhere | attaches a board | substrate mutually.

  According to this aspect, compared to the case where an adhesive layer having a refractive index larger or smaller than the refractive index of each of the quartz substrate and the quartz substrate is provided, it is given to the light modulation function or the image display function by the electro-optical device. The impact can be reduced.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention (including various aspects thereof).

  According to the electronic apparatus of the present invention, since it includes the above-described electro-optical device of the present invention, the projection display apparatus includes a transmissive liquid crystal device that can display a high-quality image or a reflective liquid crystal device using LCOS technology. Various electronic devices such as mobile phones, electronic notebooks, word processors, viewfinder type or monitor direct-view type video tape recorders, workstations, videophones, POS terminals, and touch panels can be realized.

  The operation and other advantages of the present invention will become apparent from the best mode for carrying out the invention described below.

  Hereinafter, embodiments of an electro-optical device and an electronic apparatus according to the present invention will be described with reference to the drawings. In the following drawings, the scales are different for each layer and each member so that each layer and each member can be recognized on the drawing. In the following embodiments, as an example of an electro-optical device, a TFT (Thin Film Transistor) active matrix driving type liquid crystal device with a built-in driving circuit is cited.

<Liquid crystal device>
First, the overall configuration of the liquid crystal device according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the overall configuration of the liquid crystal device according to this embodiment, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.

  1 and 2, the liquid crystal device 1 according to the present embodiment is electrically connected to the liquid crystal panel 100, a frame 310 and a hook 320 for housing the liquid crystal panel 100, and an external circuit connection terminal of the liquid crystal panel 100 described later. The wiring board 330 is connected.

  The liquid crystal panel 100 is fixed by being bonded to the frame 310 with an adhesive 340. The liquid crystal panel 100 includes a TFT array substrate 10 and a counter substrate 20 that sandwich liquid crystal, and dust-proof glasses 210 and 220 that are arranged on the side of the TFT array substrate 10 and the counter substrate 20 that do not face the liquid crystal. Has been. Here, the “liquid crystal”, the “TFT array substrate 10 and the counter substrate 20”, and the “dustproof glass 210 and 220” according to the present embodiment are the “electro-optical material”, “pair of substrates” and the like according to the present invention, respectively. It is an example of a “dust-proof substrate”.

  Here, the detailed configuration of the liquid crystal panel 100 will be described with reference to FIGS. 3 and 4. FIG. 3 is a plan view of the TFT array substrate viewed from the side of the counter substrate together with the components formed thereon, and FIG. 4 is a cross-sectional view taken along the line HH ′ of FIG. In FIG. 4, the adhesives 231 and 232 shown in FIG. 2 are omitted for convenience of explanation.

  3 and 4, in the liquid crystal panel 100, 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 provided with a sealing material provided in a seal region located around the image display region 10a. 52 are bonded to each other.

  The sealing material 52 is made of, for example, an ultraviolet curable resin, a thermosetting resin, or an ultraviolet / heat combination type curable resin for bonding the two substrates, and is applied to the TFT array substrate 10 in the manufacturing process, and then irradiated with ultraviolet rays. And cured by heating or the like. In the sealing material 52, a gap material such as glass fiber or glass beads for dispersing the distance (ie, gap) between the TFT array substrate 10 and the counter substrate 20 to a predetermined value is dispersed. Note that the gap material may be arranged in the image display region 10a or a peripheral region located around the image display region 10a in addition to or instead of the material mixed in the seal material 52.

  In FIG. 3, a light-shielding frame light-shielding film 53 that defines the image display region 10 a is provided on the counter substrate 20 side in parallel with the inside of the seal region where the sealing material 52 is disposed. 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.

  A data line driving circuit 101 and an external circuit connection terminal 102 are provided along one side of the TFT array substrate 10 in a region located outside the sealing region in which the sealing material 52 is disposed in the peripheral region. 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 so as to be covered with the frame light shielding film 53 in the frame area inside the seal area 52a along two sides adjacent to the one side.

  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. Thus, electrical conduction can be established between the TFT array substrate 10 and the counter substrate 20. Further, a lead wiring 90 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 is formed.

  In FIG. 4, on the TFT array substrate 10, a laminated structure in which pixel switching TFTs as drive elements, wiring lines such as scanning lines and data lines are formed is formed. Although the detailed structure of this laminated structure is not shown in FIG. 4, pixel electrodes 9a made of a transparent material such as ITO (Indium Tin Oxide) are provided on the laminated structure in a predetermined pattern for each pixel. It is formed in an island shape.

  The pixel electrode 9a is formed in the image display region 10a on the TFT array substrate 10 so as to face a counter electrode 21 described later. On the surface of the TFT array substrate 10 facing the liquid crystal layer 50, that is, on the pixel electrode 9a, an alignment film 16 is formed so as to cover the pixel electrode 9a.

  A light shielding film 23 is formed on the surface of the counter substrate 20 facing the TFT array substrate 10. For example, the light shielding film 23 is formed in a lattice shape when viewed in plan on the facing surface of the facing substrate 20. In the counter substrate 20, a non-opening area is defined by the light shielding film 23, and an area partitioned by the light shielding film 23 is an opening area that transmits light emitted from, for example, a projector lamp or a direct viewing backlight. The light shielding film 23 may be formed in a stripe shape, and the non-opening region may be defined by the light shielding film 23 and various components such as data lines provided on the TFT array substrate 10 side.

  On the light shielding film 23, a counter electrode 21 made of a transparent material such as ITO is formed so as to face the plurality of pixel electrodes 9a. In order to perform color display in the image display region 10a on the light shielding film 23, a color filter (not shown in FIG. 4) may be formed in a region including a part of the opening region and the non-opening region. An alignment film 22 is formed on the counter electrode 21 on the counter surface of the counter substrate 20.

  In addition to the data line driving circuit 101, the scanning line driving circuit 104, the sampling circuit 7 and the like on the TFT array substrate 10 shown in FIGS. A precharge circuit that supplies the charge signal prior to the image signal, an inspection circuit for inspecting the quality, defects, etc. of the liquid crystal device 1 during manufacture or at the time of shipment may be formed.

  1 and 2 again, the TFT array substrate 10 and the dustproof glass 210 are bonded to each other by an adhesive 231 made of, for example, silicon resin, and the counter substrate 20 and the dustproof glass 220 are made of, for example, silicon resin. Are adhered to each other by an adhesive 232.

  The dustproof substrate 210 includes a quartz substrate 212 and a quartz substrate 211 that are bonded to each other, and an adhesive layer 213 that bonds these substrates to each other. The composition of quartz and quartz is the same for SiO2, but quartz has higher crystallinity (ie, the crystal size is relatively large) compared to quartz, which is a crystalline body of SiO2, and therefore heat conduction compared to quartz. The rate is high. Therefore, according to the liquid crystal device 1, it is possible to improve the heat dissipation of the liquid crystal device 1 by the dust-proof substrate 210 as compared with the case where the dust-proof substrate 210 is configured only by the quartz substrate 211.

  In addition, according to the dust-proof substrate 210, it is possible to suppress an increase in the component cost of the dust-proof substrate 210 as compared with the case where the entire dust-proof substrate 210 is made of quartz, and accordingly, the components of the liquid crystal device 1 It is possible to suppress an increase in cost.

  In particular, in the present embodiment, since the quartz substrate 212 is disposed closer to the TFT array substrate 10 than the quartz substrate 211, the thermal energy generated in the liquid crystal panel 100 during operation of the liquid crystal panel 100 is the quartz substrate. The heat energy can be released to the outside of the liquid crystal device 1 through the quartz substrate 212 before being stored in the 211. Therefore, according to the liquid crystal device 1, the temperature rise of the liquid crystal device 1 can be further suppressed as compared with the case where the quartz substrate 211 is disposed closer to the liquid crystal panel body than the quartz substrate 212.

  The adhesive layer 213 has a refractive index between the refractive index of the quartz substrate 212 and the refractive index of the quartz substrate 211, and is in contact with the quartz substrate 212 and the quartz substrate 211. According to such an adhesive layer 213, compared with the case where an adhesive layer having a refractive index larger or smaller than the refractive index of each of the quartz substrate 212 and the quartz substrate 211 is provided, the light modulation function by the liquid crystal device 1 or There is an advantage that the influence on the image display function can be reduced.

  Similarly to the dust-proof substrate 210, the dust-proof substrate 220 has a quartz substrate 222, a quartz substrate 221, and an adhesive layer 223 that bonds these substrates to each other, and has the same configuration as the dust-proof substrate 210. ing. Therefore, similarly to the dustproof substrate 210, the heat dissipation of the liquid crystal device 1 can be enhanced, and an increase in component costs can be suppressed as much as possible.

  In this embodiment, the liquid crystal device 1 provided with the two dustproof substrates 210 and 220 is taken as an example, but at least one of the two dustproof substrates disposed on both sides of the liquid crystal panel body is used. However, if the quartz substrate and the quartz substrate are bonded to each other, it is possible to improve the heat dissipation of the liquid crystal device while suppressing an increase in component cost as much as possible. Further, the dustproof substrate is not limited to the case where the quartz substrate and the quartz substrate are bonded one by one, but a structure in which a plurality of quartz substrates and a plurality of quartz substrates are bonded to each other. Even if it has, it is possible to improve the heat dissipation of the liquid crystal device.

  Next, the relationship between the substrate surfaces 212s-1 and 212s-2 of the quartz substrate 212 and the optical axis of the quartz substrate 212 will be described with reference to FIG. FIG. 5 is a perspective view schematically showing the relative relationship between the substrate surfaces 212 s-1 and 212 s-2 of the quartz substrate 212 and the optical axis of the quartz substrate 212.

  As shown in FIG. 5, the substrate surfaces 212 s-1 and 212 s-2 of the quartz substrate 212, that is, surfaces that are parallel to the surface on which light is incident on the liquid crystal panel 100 and the surface from which light is emitted during operation of the liquid crystal panel 100. Extends along the optical axis P of the quartz substrate 212. It is desirable that the optical axis P be arranged so as to be parallel or orthogonal to the transmission axis of a polarizing plate (not shown) arranged on the incident side and the emission side of the liquid crystal panel 100.

  Therefore, the quartz substrate 212 does not have a function of compensating the phase of incident light incident on the quartz substrate 212 and does not optically affect image display by the liquid crystal device 1. Therefore, the quartz substrate 212 is provided only for enhancing the heat dissipation function. Note that, similarly to the quartz substrate 212, the quartz substrate 222 extends along the optical axis of the quartz substrate 222 and does not affect the image display performance of the liquid crystal device 1.

  Thus, according to the liquid crystal device 1 according to the present embodiment, it is possible to suppress the temperature rise of the liquid crystal device 1 during its operation, and it is possible to suppress the decrease in the modulation function that the liquid crystal device 1 modulates light. At the same time, its reliability can be increased. In addition, it is possible to suppress an increase in the cost of parts constituting the liquid crystal device 1 as much as possible.

  Next, a modification of the dustproof substrate will be described with reference to FIG. FIG. 6 is a perspective view of a dustproof substrate 220a which is a modification of the dustproof substrates 210 and 220 described above. In FIG. 6, illustration of an adhesive layer for bonding the quartz substrate 222a and the quartz substrate 221a to each other is omitted.

  In FIG. 6, the size of the quartz substrate 222a is larger than the size of the quartz substrate 221a in plan view. According to such a dustproof substrate 220a, the large surface area of the quartz substrate 222a increases the surface area from which heat energy is released, and has the advantage of further suppressing the temperature rise of the liquid crystal device.

  As described above, according to the liquid crystal device 1 according to the present embodiment, it is possible to improve heat dissipation while suppressing the component cost as much as possible, and display or project a high-quality image.

<Electronic equipment>
Next, a case where the above-described liquid crystal device is applied to a projector which is an example of an electronic device will be described with reference to FIG. The liquid crystal panel 100 in the above-described liquid crystal device is used as a light valve of a projector. FIG. 7 is a plan view showing a configuration example of the projector. In particular, in a projector, since powerful light is guided from a light source to a light valve, improvement in heat dissipation in the liquid crystal device described above is a useful technique for improving image display performance and reliability of the projector.

  As shown in FIG. 7, a projector 1100 includes a lamp unit 1102 made of a white light source such as a halogen lamp. The projection light emitted from the lamp unit 1102 is separated into three primary colors of RGB by four mirrors 1106 and two dichroic mirrors 1108 arranged in the light guide 1104, and serves as a light valve corresponding to each primary color. The light enters the liquid crystal panels 1110R, 1110B, and 1110G.

  The configurations of the liquid crystal panels 1110R, 1110B, and 1110G have the same configuration as that of the above-described liquid crystal device, and are driven by R, G, and B primary color signals supplied from the image signal processing circuit, respectively. The light modulated by these liquid crystal panels enters the dichroic prism 1112 from three directions. In this dichroic prism 1112, R and B light is refracted at 90 degrees, while G light travels straight. Accordingly, as a result of the synthesis of the images of the respective colors, a color image is projected onto the screen or the like via the projection lens 1114.

  Here, paying attention to the display images by the liquid crystal panels 1110R, 1110B, and 1110G, the display images by the liquid crystal panels 1110R and 1110B need to be horizontally reversed with respect to the display images by the liquid crystal panel 1110G.

  Since light corresponding to the primary colors R, G, and B is incident on the liquid crystal panels 1110R, 1110B, and 1110G by the dichroic mirror 1108, it is not necessary to provide a color filter.

  In addition to the electronic device described with reference to FIG. 7, a mobile personal computer, a mobile phone, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, and an electronic notebook , Calculators, word processors, workstations, videophones, POS terminals, devices with touch panels, and the like. Needless to say, the present invention can be applied to these various electronic devices.

1 is a perspective view illustrating an overall configuration of a liquid crystal device according to an embodiment of the present invention. It is the sectional view on the AA 'line of FIG. It is a top view which shows the whole structure of the liquid crystal panel which concerns on embodiment of this invention. It is the HH 'sectional view taken on the line of FIG. It is the perspective view which showed typically the relative relationship between the substrate surface of a quartz substrate, and the optical axis of a quartz substrate. It is the perspective view which showed the modification of the board | substrate for dustproof. It is a top view which shows the structure of the projector which is an example of the electronic device to which the electro-optical apparatus is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Liquid crystal device, 10 ... TFT array substrate, 10a ... Image display area, 20 ... Opposite substrate, 100 ... Liquid crystal panel, 210, 220 ... Dust-proof glass, 211, 221 ... Quartz substrate, 212, 222 ...・ Crystal substrate, 231, 232, 340... Adhesive, 310... Frame, 320.

Claims (5)

A pair of substrates holding the electro-optic material;
A dust-proof substrate having a quartz substrate and a quartz substrate bonded to each other on the outer surface of at least one of the pair of substrates ,
The quartz substrate is disposed between the quartz substrate and the one substrate, and is formed larger than a planar shape of the quartz substrate so that an end of the quartz substrate is exposed. Optical device. The quartz substrate is arranged such that the optical axis of the quartz substrate is parallel or orthogonal to the transmission axes of the polarizing plates arranged on the light incident side and the light emitting side of the pair of substrates.
The electro-optical device according to claim 1. The quartz substrate, the optical axis of the quartz substrate, an electro-optical device according to claim 1 or 2, characterized in that it is arranged along the substrate surface of the quartz substrate. The dustproof substrate has a refractive index between the refractive index of the quartz substrate and the refractive index of the quartz substrate, and an adhesive layer that bonds the quartz substrate and the quartz substrate to each other. The electro-optical device according to any one of claims 1 to 3 , wherein An electronic apparatus comprising the electro-optical device according to any one of claims 1 to 4 .

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