Electro-optical devices and electronic equipment

Abstract

To provide an electro-optical device that can uniformly heat the display area. [Solution] The electro-optical device 10 comprises a dustproof substrate 7 having a counter substrate 2, an element substrate 3, a liquid crystal layer 5 disposed between the counter substrate 2 and the element substrate 3, a heater 72 bonded to one of the substrates of the counter substrate 2 and the element substrate 3 and positioned to overlap with the display area 5, and first wiring 73 and second wiring 74 electrically connected to the heater 72 outside the display area 5. The heater 72 and the first wiring 73 are electrically connected in a first region E1 along the longitudinal direction of the display area 5, and the heater 72 and the second wiring 74 are electrically connected in a second region E2 that faces the first region E1 across the display area 5 and also along the longitudinal direction of the display area 5.

Description

Technical Field

[0001] The present invention relates to an electro-optical device and an electronic device including the electro-optical device.

Background Art

[0002] In a liquid crystal panel, when the temperature of the liquid crystal is low, the optical response deteriorates. For this reason, as described in Patent Document 1, a liquid crystal panel is known that incorporates a heater and raises the temperature of the liquid crystal by the heat generated by the heater to improve the optical response.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the liquid crystal in the display area is unevenly heated by the heater, a bias occurs in the optical response. When a bias in the optical response occurs in the display area, image quality unevenness occurs and the display quality deteriorates. In particular, in displays such as sports videos, game videos, and 4K or 8K videos, the image quality unevenness is conspicuous and causes a decrease in customer satisfaction. That is, there is a demand for a liquid crystal panel that can uniformly heat the display area by a heater.

Means for Solving the Problems

[0005] An electro-optical device according to one aspect of the present application comprises a first substrate, a second substrate, an electro-optical layer disposed between the first substrate and the second substrate, a heating element bonded to one of the first substrates and the second substrate and positioned to overlap with a display area, and a third substrate having first and second wirings electrically connected to the heating element outside the display area, wherein the heating element and the first wiring are electrically connected in a first region along the longitudinal direction of the display area, and the heating element and the second wiring are electrically connected in a second region facing the first region and the display area, and along the longitudinal direction of the display area.

[0006] An electronic device according to one aspect of the present application comprises the electro-optical device described above. [Brief explanation of the drawing]

[0007] [Figure 1] A schematic diagram showing an example of an electronic device equipped with an electro-optical device according to Embodiment 1. [Figure 2] A perspective view showing the external appearance of an electro-optical device. [Figure 3] Cross-sectional view of the electro-optical apparatus along line AA in Figure 2. [Figure 4] A block diagram showing the configuration of the display and control system of an electronic device. [Figure 5] A block diagram showing the configuration of a heater control system for electronic equipment. [Figure 6] A block diagram showing the circuit configuration of an electro-optical device. [Figure 7] Plan view of I. [Figure 8] Plan view of a dustproof circuit board. [Figure 9] Cross-sectional view of the dustproof substrate along line BB in Figure 8. [Figure 10] A perspective view of an electro-optical device equipped with a retaining member. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the dimensions of each component may be shown on a different scale to make them easier to see.

[0009] Drawings sometimes depict three axes: the X, Y, and Z axes, which are mutually orthogonal. In the following explanation, the tip of the arrows on the three axes may be referred to as the "positive side," and the base of the arrow as the "negative side." The direction parallel to the X-axis may be referred to as the "X-axis direction," the direction parallel to the Y-axis as the "Y-axis direction," and the direction parallel to the Z-axis as the "Z-axis direction." In the following, "planar view" refers to viewing an object from either the positive Z-axis side or the negative Z-axis side of the object.

[0010] 1. Embodiment 1 1.1. Configuration of the projection display device 100 Figure 1 shows the optical configuration of the projection-type display device 100 according to this embodiment. The projection display device 100 is a three-panel projector equipped with three electro-optical devices 10R, 10G, and 10B as the electro-optical device 10. In this embodiment, the projection display device 100 is an example of an electronic device.

[0011] The electronic device may be a single-chip, two-chip, or four or more electro-optical devices 10. Alternatively, the electronic device may be a smartphone, PDA (Personal Digital Assistant), camera, television, car navigation system, personal computer, display, e-paper, calculator, videophone, and POS (Point of Sale), printer, scanner, copier, video player, or device with a touch panel, all equipped with an electro-optical device 10.

[0012] The projection display device 100 includes a light source unit 2102 consisting of a laser light source, a halogen lamp, or the like. The light emitted from the light source unit 2102 is separated into three primary colors, red (R), green (G), and blue (B), by three mirrors 2106 and two dichroic mirrors 2108.

[0013] The light of R is incident on the electro-optical device 10R, and the light of G is incident on the electro-optical device 10G. The light of B is incident on the electro-optical device 10B through a relay lens system 2121 composed of an incident lens 2122, a relay lens 2123, and an exit lens 2124.

[0014] The light emitted from the electro-optical devices 10R, 10G, and 10B is incident on the dichroic prism 2112 from three directions. In the dichroic prism 2112, the light of R and B is refracted at 90 degrees, while the light of G travels straight. Therefore, the dichroic prism 2112 synthesizes the light of each of the RGB colors. The light emitted from the dichroic prism 2112 is incident on the projection lens 2114 and projected onto the screen Scr after being enlarged.

[0015] 1.2. Configuration of the electro-optical device 10 FIG. 2 is a perspective view showing the appearance of the electro-optical device 10, and FIG. 3 is a cross-sectional view taken along the line A-A of the electro-optical device 10 in FIG. 2. FIG. 2 shows the electro-optical device 10 before being attached to the holding member 9. When attaching the electro-optical device 10 to the projection display device 100, as shown in FIG. 10, the electro-optical device 10 is attached in the state of being assembled to the holding member 9 in the vicinity of the dichroic prism 2112.

[0016] In the present embodiment, the electro-optical device 10 is an active driving type transmissive liquid crystal device provided with a TFT (Thin Film Transistor) as a switching element for each pixel electrode 32. Note that the electro-optical device 10 may be a reflective liquid crystal device or a transflective liquid crystal device.

[0017] As shown in Figure 2, the electro-optical device 10 includes a liquid crystal panel 4 consisting of a counter substrate 2 and an element substrate 3, a dustproof substrate 7 positioned on the light incidence side of the liquid crystal panel 4, and a dustproof substrate 8 positioned on the light emission side of the liquid crystal panel 4. Note that if the electro-optical device 10 is a reflective liquid crystal device, the dustproof substrate 8 is not required. In this embodiment, the counter substrate 2 is an example of a first substrate, the element substrate 3 is an example of a second substrate, and the dustproof substrate 7 is an example of a third substrate.

[0018] The dustproof substrates 7 and 8 suppress scratches or dust accumulation on the opposing substrate 2 and element substrate 3, respectively. Furthermore, even if dust adheres to the incident side surface of the dustproof substrate 7 and the exit side surface of the dustproof substrate 8, the dust will not be in focus, thus the dustproof substrates 7 and 8 can suppress image quality degradation due to dust.

[0019] The element substrate 3 has a protruding portion 31 that extends from the opposing substrate 2 when viewed in plan. An FPC (Flexible Printed Circuit) board 62 is provided on the protruding portion 31, and the FPC board 62 is electrically connected to a plurality of terminals (not shown) provided on the protruding portion 31. In this embodiment, the FPC board 62 is an example of a second wiring board.

[0020] The dustproof substrate 7 has a protruding portion 71 that extends from the opposing substrate 2 when viewed from above. An FPC substrate 61 is provided on the protruding portion 71, and the FPC substrate 61 is electrically connected to a plurality of terminals 73t, 74t, 76 (see Figure 7), which will be described later and are provided on the protruding portion 71. In this embodiment, the FPC substrate 61 is an example of a first wiring board.

[0021] The FPC substrates 61 and 62 extend in the same direction and are arranged to overlap each other in a plan view. Specifically, the FPC substrate 61 extends from the protruding portion 71 in the negative Y-axis direction, and the FPC substrate 62 extends from the protruding portion 31 in the negative Y-axis direction. Furthermore, the FPC substrates 61 and 62 overlap in the Z-axis direction.

[0022] By arranging the FPC substrate 61 and FPC substrate 62 in this manner, even when using multiple FPC substrates 61 and 62, a good electrical connection can be established between the projection display device 100 and the electro-optical device 10.

[0023] As shown in Figure 3, the electro-optical device 10 includes a counter substrate 2 on which a common electrode 22 is provided, an element substrate 3 on which pixel electrodes 32 and a TFT (not shown) are provided, a sealing material 40, and a liquid crystal layer 50 provided between the counter substrate 2, the element substrate 3, and the sealing material 40. In this embodiment, the liquid crystal layer 50 is an example of an electro-optical layer.

[0024] In this embodiment, the opposing substrate 2 is placed on the light incidence side, and the element substrate 3 is placed on the light emission side. The incident light IL incident on the opposing substrate 2 is modulated by the liquid crystal layer 50 and emitted from the element substrate 3 as modulated light ML.

[0025] The dustproof substrate 7 is bonded to the light-incident side of the opposing substrate 2, and the dustproof substrate 8 is bonded to the light-emitting side of the element substrate 3. In Figure 3, for illustrative purposes, the dustproof substrate 7 and the opposing substrate 2, and the dustproof substrate 8 and the element substrate 3 are shown to be separated, but in reality, as shown in Figure 2, the dustproof substrate 7 and the opposing substrate 2, and the dustproof substrate 8 and the element substrate 3 are in close contact.

[0026] The dustproof substrate 7 has a heater 72. In this embodiment, the heater 72 is an example of a heating element. The heater 72 is made of ITO (Indium tin Oxide), a light-transmitting conductive material, and is positioned to overlap with the display area 5 in a plan view. According to the inventors' findings, the heater 72 can produce a brighter display if it is provided on the dustproof substrate 7 on the incident side rather than on the dustproof substrate 8 on the ejection side. Thus, in this embodiment, the heater 72 is provided on the dustproof substrate 7 on the incident side, but the heater 72 may also be provided on the dustproof substrate 8 on the ejection side.

[0027] 1.3. Electrical Configuration 1.3.1. Display Control System Figure 4 is a block diagram showing the configuration for controlling the display. As shown in Figure 4, the projection display device 100 includes a display control circuit 15, electro-optical devices 10R, 10G, and 10B, and an FPC board 62 that electrically connects the display control circuit 15 to each of the electro-optical devices 10R, 10G, and 10B.

[0028] The display control circuit 15 receives video data Vid-in from a higher-level device, such as a host device (not shown), synchronized with the synchronization signal Sync. The video data Vid-in specifies the grayscale level of each pixel in the image to be displayed, for example, using 8 bits for each RGB component.

[0029] The Sync synchronization signal includes a vertical synchronization signal that instructs the start of vertical scanning of the video data Vid-in, a horizontal synchronization signal that instructs the start of horizontal scanning, and a clock signal that indicates the timing of one video pixel in the video data Vid-in.

[0030] The display control circuit 15 separates the video data Vid-in from the host device into RGB components and converts them into analog voltage data signals, which are then supplied to the electro-optical devices 10R, 10G, and 10B. Specifically, the display control circuit 15 converts the R component of the video data Vid-in into analog and supplies it as data signal Vid_R to the electro-optical device 10R via the FPC board 62, converts the G component into analog and supplies it as data signal Vid_G to the electro-optical device 10G via the FPC board 62, and converts the B component into analog and supplies it as data signal Vid_B to the electro-optical device 10B via the FPC board 62. The display control circuit 15 supplies the data signals Vid_R, Vid_G, and Vid_B in synchronization with the control signal Ctr.

[0031] 1.3.2. Heater Control System Figure 5 is a block diagram showing the configuration for controlling the heater 72. The projection-type display device 100 includes a temperature control circuit 16, a heater 72 and a temperature sensor 17 provided in the electro-optical device 10, and an FPC substrate 61 that electrically connects the temperature control circuit 16 and the electro-optical device 10.

[0032] The temperature control circuit 16 applies a drive voltage to the heater 72 via the FPC board 61. The temperature sensor 17 detects the temperature of the electro-optical device 10 and outputs information Temp, which indicates the temperature, as the detected value. The information Temp is supplied to the temperature control circuit 16 via the FPC board 62.

[0033] The temperature control circuit 16 controls the voltage applied to the heater 72 so that the temperature indicated by the information Temp becomes the target temperature. Specifically, if the temperature indicated by the information Temp is lower than the target temperature, the temperature control circuit 16 increases the voltage applied to the heater 72, and if the temperature indicated by the information Temp is higher than the target temperature, it decreases the voltage applied to the heater 72.

[0034] The target temperature is the temperature suitable for the use of the electro-optical device 10 and is preset in the temperature control circuit 16. Furthermore, fluctuations in the voltage supplied to the heater 72 can become a source of noise. For this reason, the FPC board 61 is used only to apply voltage to the heater 72, and other signals are routed through the FPC board 62 to suppress the influence of noise from the FPC board 61.

[0035] 1.3.3. Circuit configuration of electro-optical device 10 Figure 6 is a block diagram showing the circuit configuration of the electro-optical device 10. The element substrate 3 has a scan line drive circuit 34, a data line drive circuit 35, and a temperature sensor 17 around the periphery of the display area 5, and the display area 5 has a plurality of scan lines 36 extending along the X axis, a plurality of data lines 37 extending along the Y axis, and a pixel circuit 38 provided corresponding to the intersections of the scan lines 36 and the data lines 37.

[0036] If the number of scan lines 36 is m and the number of data lines 37 is n, the pixel circuit 38 is arranged in a matrix with m rows and n columns. Both m and n are integers of 2 or greater. The pixel circuit 38 includes a pixel electrode 32 (see Figure 3), a common electrode 22, and a TFT (not shown).

[0037] In the region 31a of the protruding portion 31 (see Figure 2) of the element substrate 3, multiple terminals are provided on which the FPC substrate 62 is mounted. These multiple terminals include terminals for supplying a control signal Ctr to the scan line drive circuit 34, terminals for supplying data signals etc. to the data line drive circuit 35, and terminals for supplying information Temp from the temperature sensor 17 to the temperature control circuit 16.

[0038] 1.4. Configuration of the dustproof circuit board 7 Figures 7 and 8 are plan views of the dustproof substrate 7, and Figure 9 is a cross-sectional view of the dustproof substrate along line BB in Figure 8. Figure 7 is a diagram illustrating the arrangement of the first wiring 73, the second wiring 74, the light-shielding member 75, and the third terminal 76, with the heater 72 and electrode 79 omitted.

[0039] 1.4.1. Configuration of the first wiring 73 and the second wiring 74 As shown in Figure 7, the dustproof substrate 7, in plan view, has a first wiring 73, a second wiring 74, a light-shielding member 75, a first terminal 73t, a second terminal 74t, a third terminal 76, and an alignment mark 78 outside the display area 5. The first wiring 73, the second wiring 74, the light-shielding member 75, the first terminal 73t, the second terminal 74t, the third terminal 76, and the alignment mark 78 are all made of a light-shielding conductive material. In this embodiment, for example, it has a structure in which a layer made of titanium nitride (TiN) and a layer made of aluminum-copper alloy (AlCu) or aluminum-silicon-copper alloy (AlSiCu) are laminated together.

[0040] The first wiring 73 and the second wiring 74 are wires for applying voltage to the heater 72. The first wiring 73 includes a first portion 73a provided on the protruding portion 71 between the display area 5 and the first side 7a, a second portion 73b provided between the display area 5 and the second side 7b, and a third portion 73c provided between the display area 5 and the third side 7c.

[0041] The first portion 73a is a portion that extends along the first side 7a of the dustproof substrate 7 from near the center of the first side 7a to near the end on the positive side of the X axis in the first direction d1. The second portion 73b is a portion that extends along the second side 7b of the dustproof substrate 7, near the positive end of the first portion 73a in the X-axis direction, in other words, from near the negative end of the second side 7b in the Y-axis direction to near the positive end in the Y-axis direction.

[0042] The third portion 73c is a portion that extends along the third side 7c of the dustproof substrate 7, near the positive Y-axis end of the second portion 73b, in other words, from near the positive X-axis end of the third side 7c to near the negative X-axis end in the second direction d2, which is opposite to the first direction d1.

[0043] The first terminal 73t electrically connects the first wiring 73 and the FPC substrate 61. The first terminal 73t is a portion formed in a comb-like shape on the negative side in the Y-axis direction from the first portion 73a of the first wiring 73, and is formed using the same process and materials as the first wiring 73.

[0044] Of the four sides surrounding the dustproof substrate 7, the first side 7a and the third side 7c are sides that run along the longitudinal direction of the display area 5, with the display area 5 in between, while the second side 7b and the fourth side 7d are sides that run along the short direction of the display area 5, with the display area 5 in between, with the display area 5 in between. The first side 7a and the third side 7c intersect with the second side 7b and the fourth side 7d.

[0045] The second wiring 74 includes a fourth portion 74a provided in the protruding portion 71 between the display area 5 and the first side 7a, a fifth portion 74b provided between the display area 5 and the fourth side 7d, and a sixth portion 74c provided between the display area 5 and the protruding portion 71.

[0046] The fourth portion 74a is a portion that extends along the first side 7a of the dustproof substrate 7 from near the center of the first side 7a to near the end on the negative side of the X-axis in the second direction d2. The fifth portion 74b is a portion that extends along the fourth side 7d of the dustproof substrate 7, from near the negative end of the fourth portion 74a in the X-axis direction, or in other words, from near the negative end of the fourth side 7d in the Y-axis direction, to just before the light-shielding member 75.

[0047] The sixth portion 74c is a portion that extends along the first side 7a of the dustproof substrate 7, in front of the light-shielding member 75 of the fifth portion 74b, in other words, from near the negative end of the first side 7a in the X-axis direction to near the positive end in the X-axis direction in the first direction d1.

[0048] The second terminal 74t electrically connects the second wiring 74 and the FPC substrate 61. The second terminal 74t is a comb-shaped portion formed on the negative side in the Y-axis direction from the fourth portion 74a of the second wiring 74, and is formed using the same process and materials as the first wiring 73.

[0049] The third terminal 76 is provided in the protruding portion 71 between the first terminal 73t and the second terminal 74t. The third terminal 76 is electrically insulated from the first terminal 73t and the second terminal 74t. In this embodiment, there are two third terminals 76, but the number of third terminals 76 may be one or three or more.

[0050] In a plan view, the light-shielding member 75 is positioned between the display area 5 and the fourth side 7d of the dustproof substrate 7, extending along the fourth side 7d, and is positioned to sandwich the second portion 73b of the first wiring 73 and the display area 5.

[0051] The light-shielding member 75 is separated from both the first wiring 73 and the second wiring 74 and electrically insulated. However, the light-shielding member 75 may be connected to either the first wiring 73 or the second wiring 74. Alignment marks 78 are provided on the protruding portion 71 and are used for positioning when pressing the FPC substrate 61 onto the dustproof substrate 7 via an anisotropic conductive member. This electrically connects the first terminal 73t, second terminal 74t, and third terminal 76 of the dustproof substrate 7 to the FPC substrate 61.

[0052] 1.4.2. Configuration of Heater 72 As shown in Figure 8, the heater 72 is positioned such that, in a plan view, it overlaps with the entire display area 5, with its third side 7c overlapping with the third portion 73c of the first wiring 73, and its first side 7a overlapping with the sixth portion 74c of the second wiring 74.

[0053] The heater 72 is electrically connected to the third portion 73c of the first wiring 73 in the first region E1 along the longitudinal direction of the display area 5, and is electrically connected to the sixth portion 74c of the second wiring 74 in the second region E2 along the longitudinal direction of the display area 5.

[0054] The first region E1 is a region in the third portion 73c of the first wiring 73 that extends from near the positive end in the X-axis direction to near the negative end in the X-axis direction, and its length in the X-axis direction corresponds to the length of the longer side of the display region 5. The insulating layer 70b of the first region E1, which will be described later, is provided with a contact hole 77a for electrically connecting the first wiring 73 and the heater 72.

[0055] The second region E2 is a region in the sixth portion 74c of the second wiring 74 that extends from near the negative end in the X-axis direction to near the positive end in the X-axis direction, and its length in the X-axis direction is equivalent to the length of the longer side of the display region 5. Contact holes 77b for electrically connecting the second wiring 74 and the heater 72 are provided throughout the entire second region E2.

[0056] By providing the first region E1 and the second region E2 in this way, the resistance values ​​between the first region E1 and the second region E2 can be made uniform in the region that overlaps with the display region 5 in a plan view. In other words, in the region that overlaps with the display region 5 in a plan view, current flows uniformly through the heater 72. Therefore, according to the configuration of this embodiment, the heater 72 can be heated uniformly, and the display region 5 of the liquid crystal panel 4 can be heated uniformly.

[0057] Electrodes 79 are provided at the first terminal 73t, the second terminal 74t, and the third terminal 76, respectively. The electrodes 79 are made of ITO, similar to the heater 72. An FPC substrate 61 is mounted on the first terminal 73t, the second terminal 74t, and the third terminal 76. The FPC substrate 61 is electrically connected to the first terminal 73t, the second terminal 74t, and the third terminal 76 via the electrodes 79, and thereby electrically connected to the heater 72.

[0058] In this embodiment, the mounting terminals consisting of the first terminal 73t, the second terminal 74t, and the third terminal 76 are formed in the same shape as a plurality of terminals (not shown) on which the FPC substrate 62 is mounted. Therefore, the FPC substrate 61 can be mounted in the same way as the FPC substrate 62, thereby reducing the effort required for mounting and ensuring consistent mounting quality.

[0059] In this embodiment, a third terminal 76 is provided between the first terminal 73t and the second terminal 74t, electrically insulated from the first terminal 73t and the second terminal 74t. This reduces the risk of short-circuiting between the first wiring 73 and the second wiring 74, thereby improving the reliability of the heater 72. Furthermore, the provision of the third terminal 76 increases the mounting area, improving the reliability of the connection of the FPC board 61 compared to the case where the third terminal 76 is not provided.

[0060] As shown in Figure 9, the dustproof substrate 7 includes a base substrate 70, insulating layers 70a and 70b provided on the upper surface of the base substrate 70 (the surface on the negative side in the Z-axis direction in Figure 9), a first wiring 73, a second wiring 74, a third terminal 76 (see Figure 8), and a light-shielding member 75 (see Figure 8) provided between the insulating layers 70a and 70b, a heater 72 provided on the upper surface of the insulating layer 70b, and an electrode 79. Alternatively, the insulating layer 70a may be omitted on the base substrate 70, and the first wiring 73, second wiring 74, first terminal 73t, second terminal 74t, third terminal 76, and light-shielding member 75 may be provided in contact with the base substrate 70.

[0061] As shown in Figure 9, the heater 72 is electrically connected to the first wiring 73 via a contact hole 77a provided in the first region E1, and electrically connected to the second wiring 74 via a contact hole 77b provided in the second region E2. The electrode 79 is electrically connected to the first terminal 73t via a contact hole 77c. The electrode 79 is similarly configured at the second terminal 74t and the third terminal 76.

[0062] The base substrate 70 is, for example, a sapphire substrate. The sapphire substrate is made of a transparent material with excellent scratch resistance and heat resistance. The base substrate 70 may also be a quartz substrate or a Neoceram® substrate. The dustproof substrate 8 is also the same.

[0063] 1.5. Configuration of the retaining member 9 Figure 10 is a perspective view of an electro-optical device 10 equipped with a holding member 9. The retaining member 9 comprises a frame 93, a heat dissipation member 91, and a hook 94.

[0064] The frame 93 houses the electro-optical device 10. The frame 93 has screw holes 93s, which allow it to be mounted in a predetermined position near the dichroic prism 2112. The frame 93 has through holes 93h, and when the electro-optical device 10 is housed in the frame 93, the FPC substrate 61 is pulled out from the through holes 93h towards the negative Y-axis direction. The FPC substrate 62 is pulled out from a through hole (not shown) in the frame 93 towards the negative Y-axis direction.

[0065] The heat dissipation member 91 has a plurality of fins 91f that extend in the same direction as the FPC substrate 61. The FPC substrate 61 is positioned between two adjacent fins 91f located in the center of the plurality of fins 91f. As described above, since the FPC substrate 61 is used only for applying voltage to the heater 72, a thinner FPC can be used than the FPC substrate 62. Therefore, the FPC substrate 61 can be positioned between two adjacent fins 91f to reduce the overall size. In addition, by positioning the heat dissipation member 91 between the FPC substrate 61 and the FPC substrate 62, the heat dissipation member 91 acts as a shield, suppressing the influence of noise from the FPC substrate 61.

[0066] The hook 94 is a light-shielding member provided to cover the periphery of the dustproof substrate 7, and is detachably attached to the frame 93.

[0067] As described above, the electro-optical device 10 of this embodiment provides the following advantages. The electro-optical device 10 of this embodiment comprises a first substrate, an opposing substrate 2; a second substrate, an element substrate 3; a liquid crystal layer 50 as an electro-optical layer disposed between the opposing substrate 2 and the element substrate 3; a third substrate, a dustproof substrate 7, having a heater 72 as a heating element bonded to one of the substrates, the opposing substrate 2 or the element substrate 3, and positioned to overlap with the display area 5; and first wiring 73 and second wiring 74 electrically connected to the heater 72 outside the display area 5. The heater 72 and the first wiring 73 are electrically connected in a first region E1 along the longitudinal direction of the display area 5, and the heater 72 and the second wiring 74 are electrically connected in a second region E2 that faces the first region E1 across the display area 5 and also along the longitudinal direction of the display area 5.

[0068] Thus, in the electro-optical device 10, the heater 72 and the first wiring 73 are electrically connected in a first region E1 along the longitudinal direction of the display area 5, and the heater 72 and the second wiring 74 are electrically connected in a second region E2 that faces the first region E1 across the display area 5 and also along the longitudinal direction of the display area 5.

[0069] Therefore, in the electro-optical device 10 of this embodiment, the heater 72 can uniformly heat the display area 5. Thus, the display quality can be improved according to the electro-optical device 10 of this embodiment.

[0070] In the electro-optical device 10 of this embodiment, the first wiring 73 has a first portion 73a extending in a first direction d1 along the first side 7a of the dustproof substrate 7, a second portion 73b extending from the first portion 73a along the second side 7b that intersects with the first side 7a of the dustproof substrate 7, and a third portion 7 extending from the second portion 73b along the third side 7c that intersects with the second side 7b of the dustproof substrate 7 and faces the first side 7a, in a second direction d2 opposite to the first direction d1, and arranged with respect to the first portion 73a of the first wiring 73 so as to sandwich the display area 5. The second wiring 74 includes a fourth portion 74a extending in a second direction d2 along the first side 7a of the dustproof substrate 7, a fifth portion 74b extending from the fourth portion 74a along the fourth side 7d which intersects with the first side 7a of the dustproof substrate 7 and faces the second side 7b, and a sixth portion 74c extending from the fifth portion 74b in a first direction d1 along the first side 7a of the dustproof substrate 7. The heater 72 is electrically connected to the third portion 73c of the first wiring 73 and to the sixth portion 74c of the second wiring 74.

[0071] Thus, in the electro-optical device 10, the heater 72 is electrically connected to the third portion 73c of the first wiring 73 and to the sixth portion 74c of the second wiring 74. Therefore, in the electro-optical device 10 of this embodiment, the heater 72 can uniformly heat the display area 5. Thus, the electro-optical device 10 of this embodiment can improve the display quality.

[0072] In the electro-optical device 10 of this embodiment, the dustproof substrate 7 is arranged so as to sandwich the second portion 73b of the first wiring 73 and the display area 5, and has a light-shielding member 75 that extends along the fourth side 7d of the dustproof substrate 7.

[0073] Therefore, since the first wiring 73, the second wiring 74, and the light-shielding member 75 are arranged to surround the display area 5, the light-shielding performance can be improved. Thus, according to this embodiment, a high-contrast electro-optical device 10 can be realized.

[0074] In the electro-optical device 10 of this embodiment, the dustproof substrate 7 has a first terminal 73t and a second terminal 74t arranged along the first side 7a, the first terminal 73t is electrically connected to the first portion 73a of the first wiring 73, and the second terminal 74t is electrically connected to the fourth portion 74a of the second wiring 74.

[0075] Thus, the first terminal 73t electrically connected to the first wiring 73 and the second terminal 74t electrically connected to the second wiring 74 are arranged along the first side 7a. Therefore, the electro-optical device 10 of this embodiment can make good electrical connections between the heater 72 and the FPC substrate 61 to which voltage is applied, so that the display area 5 can be heated uniformly by the heater 72.

[0076] In the electro-optical device 10 of this embodiment, the first portion 73a of the first wiring 73 is electrically connected to a plurality of first terminals 73t, and the fourth portion 74a of the second wiring 74 is electrically connected to a plurality of second terminals 74t.

[0077] Thus, since the electro-optical device 10 of this embodiment is equipped with a plurality of first terminals 73t and a plurality of second terminals 74t, the electrical connection between the heater 72 and the FPC substrate 61 to which voltage is applied can be improved. Therefore, the electro-optical device 10 of this embodiment can uniformly heat the display area 5 with the heater 72.

[0078] In the electro-optical device 10 of this embodiment, the dustproof substrate 7 has a third terminal 76 between the first terminal 73t and the second terminal 74t, and the third terminal 76 is not electrically connected to the first wiring 73 and the second wiring 74.

[0079] Thus, the electro-optical device 10 of this embodiment has a third terminal 76 between the first terminal 73t and the second terminal 74t, which can suppress short circuits between the first terminal 73t and the second terminal 74t. Furthermore, by providing the third terminal 76 between the first terminal 73t and the second terminal 74t, the mountability of the FPC substrate 61 can be improved. In other words, the mounting area is increased, which can suppress peeling of the FPC substrate 61.

[0080] In the electro-optical device 10 of this embodiment, an FPC substrate 61 is provided as a first wiring board electrically connected to the first terminal 73t and the second terminal 74t, and an FPC substrate 62 is provided as a second wiring board electrically connected to the other substrate of the opposing substrate 2 and the element substrate 3. The FPC substrates 61 and 62 extend in the same direction and are arranged to overlap each other.

[0081] In this manner, the FPC substrates 61 and 62 extend in the same direction and are arranged to overlap each other. This allows for good electrical connection between the projection display device 100 and the electro-optical device 10.

[0082] In the electro-optical device 10 of this embodiment, a holding member 9 is provided which has a heat dissipation member 91 that is arranged to overlap with a portion of the FPC substrate 61 and the FPC substrate 62 and includes a plurality of fins 91f that extend along the FPC substrate 61, and the FPC substrate 61 is arranged between adjacent fins 91f.

[0083] Thus, the FPC substrate 61 is positioned between adjacent fins 91f. Therefore, even with the use of the FPC substrate 61, the overall size can be made compact. Furthermore, the fins 91f act as shields, suppressing the noise effects of the FPC substrate 61.

[0084] The projection-type display device 100 as an electronic device in this embodiment includes the electro-optical device 10 described above. Therefore, since the projection display device 100 of this embodiment is equipped with an electro-optical device 10 that can uniformly heat the display area 5, it can achieve excellent display quality.

[0085] Although preferred embodiments have been described above, the present invention is not limited to the embodiments described above. Furthermore, the configuration of each part of the present invention can be replaced with any configuration that performs a similar function to that of the embodiments described above, and any configuration can be added. [Explanation of symbols]

[0086] d1...First direction, d2...Second direction, 2...Opposite substrate, 3...Element substrate, 4...Liquid crystal panel, 5...Display area, 7...Dustproof substrate, 7a...First side, 7b...Second side, 7c...Third side, 7d...Fourth side, 8...Dustproof substrate, 10, 10B, 10G, 10R...Electro-optical device, 15...Display control circuit, 16...Temperature control circuit, 17...Temperature sensor, 22...Common electrode, 31...Protruding part, 31a... Region, 32...Pixel electrode, 34...Scan line drive circuit, 35...Data line drive circuit, 36...Scan line, 37...Data line, 38...Pixel circuit, 40...Sealing material, 50...Liquid crystal layer, 61,62...FPC substrate, 70...Base substrate, 70a,70b...Insulating layer, 71...Protruding part, 72...Heater, 73...First wiring, 73a...First part, 73b...Second part, 73c...Third part, 73t...Second 1 terminal, 74...second wiring, 74a...fourth part, 74b...fifth part, 74c...sixth part, 74t...second terminal, 75...light shielding member, 76...third terminal, 77a, 77b, 77c...contact holes, 78...alignment marks, 79...electrode, 9...holding member, 91...heat dissipation member, 91f...fin, 93...frame, 93h...through hole, 93s...screw hole, 94...hook, 100...projection type display device, 2102...light source unit, 2106...mirror, 2108...dichroic mirror, 2112...dichroic prism, 2114...projection lens, 2121...relay lens system, 2122...incident lens, 2123...relay lens, 2124...exit lens, E1...first region, E2...second region, IL...incident light, ML...modulated light, Scr...screen

Claims

1. First circuit board and The second circuit board and An electro-optical layer disposed between the first substrate and the second substrate, The third substrate comprises a heating element bonded to one of the first substrate and the second substrate and positioned in a location overlapping the display area, and a first wiring and a second wiring electrically connected to the heating element outside the display area, The heating element and the first wiring are electrically connected in a first region along the longitudinal direction of the display area, and the heating element and the second wiring are electrically connected in a second region that faces the first region and the display area, and also along the longitudinal direction of the display area. Electro-optical device.

2. The first wiring includes a first portion extending in a first direction along the first edge of the third substrate, a second portion extending from the first portion along a second edge intersecting the first edge of the third substrate, and a third portion extending from the second portion in a second direction opposite to the first direction along a third edge that intersects the second edge of the third substrate and faces the first edge, and is arranged to sandwich the display area with respect to the first portion of the first wiring. The second wiring includes a fourth portion extending in the second direction along the first edge of the third substrate, a fifth portion extending from the fourth portion along the fourth edge that intersects with the first edge of the third substrate and faces the second edge, and a sixth portion extending from the fifth portion in the first direction along the first edge of the third substrate. The heating element is electrically connected to the third portion of the first wiring and to the sixth portion of the second wiring. The electro-optical apparatus according to claim 1.

3. The third substrate is positioned so as to sandwich the second portion of the first wiring and the display area, and has a light-shielding member that extends along the fourth side of the third substrate. The electro-optical apparatus according to claim 2.

4. The third substrate has first terminals and second terminals arranged along the first edge, The first terminal is electrically connected to the first portion of the first wiring, The second terminal is electrically connected to the fourth portion of the second wiring. The electro-optical apparatus according to claim 2.

5. The first portion of the first wiring is electrically connected to a plurality of the first terminals, The fourth portion of the second wiring is electrically connected to a plurality of the second terminals. The electro-optical apparatus according to claim 4.

6. The third substrate has a third terminal between the first terminal and the second terminal, The third terminal is not electrically connected to the first and second wiring. The electro-optical apparatus according to claim 4.

7. The device comprises a first wiring board electrically connected to the first terminal and the second terminal, and a second wiring board electrically connected to the other of the first and second boards, The first wiring board and the second wiring board each extend in the same direction and are arranged to overlap each other. The electro-optical apparatus according to claim 4.

8. The retaining member is arranged to overlap with a portion of the first wiring board and the second wiring board, and includes a heat dissipation member with a plurality of fins extending along the first wiring board, The first wiring board is positioned between adjacent fins, The electro-optical apparatus according to claim 7.

9. An electronic device comprising an electro-optical apparatus as described in any one of claims 1 to 8.

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