JP2010271344A - Electro-optical device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-optical device configured to cool a liquid crystal display panel with high efficiency by cooling air, and to provide a projector. <P>SOLUTION: The electro-optical device has a liquid crystal display panel 10 including a counter substrate 11 being a first substrate and a TFT substrate 12 being a second substrate which hold a liquid crystal layer in between, an incident side dust-proof glass 13 being an incident side substrate which transmits light made incident on the first substrate, and an emitting side dust-proof glass 14 being an emitting side substrate which transmits light emitted from the second substrate, and has at least either a first duct constituting member 22 and a second duct constituting member 23 which constitute an incident side cooling duct 20 with the incident side substrate or a first duct constituting member 24 and a second duct constituting member 25 which constitute an emitting side cooling duct 21 with the emitting side substrate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electro-optical device and a projector, and more particularly to an electro-optical device that modulates light according to an image signal.

  Conventionally, a projector has been developed for the purpose of improving projection performance and downsizing. As projectors, for example, projectors including transmissive liquid crystal display panels for red (R) light, green (G) light, and blue (B) light are widely used. The liquid crystal display panel generates heat by absorbing illumination light. For example, a fan that allows air to flow is used for heat dissipation of the liquid crystal display panel.

  As a configuration using a fan, for example, there is a configuration in which an opening of a duct is provided under a portion where each liquid crystal display panel is arranged, and cooling air is ejected from the opening. The cooling air is supplied from the opening to the surface of the liquid crystal display panel. A projector including a fan is desired to be capable of efficient cooling with a small air volume in order to reduce noise. For example, Patent Document 1 proposes a technique of providing heat radiation fins on a frame of a liquid crystal display panel for the purpose of efficiently cooling the liquid crystal display panel.

JP 2004-325575 A

  When the cooling air is ejected from the opening of a duct provided toward the liquid crystal display panel, the cooling air is diffused before reaching the liquid crystal display panel, in addition to proceeding to the surface of the liquid crystal display panel. For this reason, there arises a problem that the cooling performance deteriorates because the air volume at the surface of the liquid crystal display panel is lower than the air volume at the opening of the duct. SUMMARY An advantage of some aspects of the invention is that it provides an electro-optical device and a projector including a configuration for cooling a liquid crystal display panel with high efficiency by cooling air.

  In order to solve the above-described problems and achieve the object, an electro-optical device according to the present invention includes a first substrate and a second substrate that sandwich a liquid crystal layer, and an incident side that transmits light incident on the first substrate. A cooling duct in which a cooling air for cooling the liquid crystal display panel flows, the liquid crystal display panel having a substrate and an emission side substrate that transmits light emitted from the second substrate; It has at least one of a duct constituent member configured with the substrate, and a duct constituent member configured with the emission side substrate, and a cooling duct through which cooling air for cooling the liquid crystal display panel flows. .

  By forming the cooling duct with the incident side substrate, the emission side substrate and the duct constituent member, it is possible to prevent the cooling air from being dissipated and to efficiently advance the cooling air to the surface of the liquid crystal display panel. By causing the cooling air to efficiently travel to the surface of the liquid crystal display panel, the liquid crystal display panel can be cooled with high efficiency.

  As a preferred aspect of the present invention, it is desirable that at least one of the incident side substrate and the emission side substrate is fixed to a surface constituting the inner surface of the cooling duct among the duct constituent members. Accordingly, the incident side substrate and the emission side substrate are arranged inside the cooling duct, and the liquid crystal display panel can be efficiently cooled.

  Moreover, as a preferable aspect of the present invention, it is desirable that the cooling duct is configured by combining a plurality of the duct constituent members. Thereby, the structure which fixes an incident side board | substrate and an emission side board | substrate to the surface which comprises the inner surface of a cooling duct among duct structural members is realizable.

  Moreover, as a preferable aspect of the present invention, the plurality of duct constituent members include a first duct constituent member and a second duct constituent member, and the first duct constituent member and the second duct constituent member are: It is desirable that the cooling duct be joined at a joining surface substantially parallel to the direction in which the cooling air flows. Thereby, the cooling duct can be configured by combining the first duct constituent member and the second duct constituent member.

  Moreover, as a preferable aspect of the present invention, the plurality of duct constituent members include a first duct constituent member and a second duct constituent member, and the first duct constituent member and the second duct constituent member are: It is desirable that the cooling duct be joined at a joining surface substantially perpendicular to the direction in which the cooling air flows. Thereby, the cooling duct can be configured by combining the first duct constituent member and the second duct constituent member.

  Moreover, as a preferable aspect of the present invention, when a perpendicular of the irradiation region passing through the center of the irradiation region in the liquid crystal display panel is used as a central axis, the joining position of the first duct component member and the second duct component member is It is desirable that the plane substantially coincides with a plane including the central axis. By joining the first duct constituent member and the second duct constituent member in a thermally neutral position, the thermal conductivity is obtained by joining the first duct constituent member and the second duct constituent member. Can be less affected.

  As a preferred aspect of the present invention, it is desirable that at least one of the incident side substrate and the emission side substrate is fixed to a surface of the duct constituent member that constitutes an outer surface of the cooling duct. Thereby, the cooling duct can be configured without dividing the duct constituent member into a plurality of parts.

  Moreover, as a preferable aspect of the present invention, it is desirable that the duct constituent member is configured using a metal material. Thereby, the heat conductivity of a duct structural member can be made high and a liquid crystal display panel can be cooled further efficiently.

  Moreover, as a preferable aspect of the present invention, an incident-side polarizing plate provided to face the incident-side substrate is provided, and the incident-side polarizing plate, together with the duct constituent member and the incident-side substrate, has the cooling duct. It is desirable to configure. Thereby, the incident side polarizing plate can be efficiently cooled by the cooling air flowing through the cooling duct.

  Moreover, as a preferable aspect of the present invention, it has an emission-side polarizing plate provided to face the emission-side substrate, and the emission-side polarizing plate, together with the duct constituent member and the emission-side substrate, has the cooling duct. It is desirable to configure. Thereby, the exit side polarizing plate can be efficiently cooled by the cooling air flowing through the cooling duct.

  Furthermore, the projector according to the present invention includes a light source unit that emits light, the electro-optical device that modulates light emitted from the light source unit according to an image signal, and the cooling air that flows through the cooling duct. And a cooling air supply unit for supplying air. By using the electro-optical device, the liquid crystal display panel can be efficiently cooled by the cooling air flowing through the cooling duct. By efficiently cooling the liquid crystal display panel, the deterioration of the liquid crystal display panel is reduced. Further, by enabling efficient cooling, the amount of cooling air to be flowed can be reduced. For example, it is possible to reduce the driving sound of a fan used as a cooling air supply unit. As a result, it is possible to obtain a projector with excellent silence and high reliability.

  Moreover, as a preferable aspect of the present invention, it is desirable to have a plurality of the electro-optical devices and a duct coupling portion that couples the cooling ducts of the electro-optical devices. Accordingly, the plurality of electro-optical devices can be cooled by causing the cooling air to flow through the common flow path. Further, heat can be radiated through the duct coupling portion.

  Moreover, as a preferable aspect of the present invention, it is desirable that the duct coupling portion is configured using a metal member. Thereby, the thermal conductivity of the duct coupling portion can be increased, and the liquid crystal display panel can be cooled more efficiently.

1 is a perspective view of an electro-optical device according to Example 1. FIG. FIG. 2 is a cross-sectional view of the electro-optical device shown in FIG. 1 taken along line AA. It is a perspective view of the state which removed the 2nd duct structural member from the structure shown in FIG. FIG. 6 is a perspective view of an electro-optical device according to a modification example of Example 1. 6 is an XZ sectional view of an electro-optical device according to Example 2. FIG. FIG. 6 is a schematic configuration diagram of a projector according to a third embodiment. It is a plane schematic block diagram of the cooling structure for cooling an electro-optical apparatus.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view of an electro-optical device 1 according to a first embodiment of the invention. FIG. 2 is a cross-sectional view of the electro-optical device 1 shown in FIG. The electro-optical device 1 that is a transmissive liquid crystal display device includes a liquid crystal display panel 10 that transmits light. In the figure, the axis in the direction perpendicular to the irradiation surface of the liquid crystal display panel 10 is taken as the X axis. The Y axis is an axis perpendicular to the X axis. The Z axis is an axis perpendicular to the X axis and the Y axis. The AA cross section shown in FIG. 2 is an XZ cross section including the center of the irradiation region of the liquid crystal display panel 10.

  The liquid crystal display panel 10 includes a counter substrate 11, a TFT (Thin Film Transistor) substrate 12, an incident side dustproof glass 13, and an emission side dustproof glass 14. The counter substrate 11 that functions as the first substrate is provided to face the TFT substrate 12. The counter substrate 11 has a counter electrode. The TFT substrate 12 functioning as the second substrate has a TFT element. The counter substrate 11 and the TFT substrate 12 sandwich a liquid crystal layer (not shown). The liquid crystal layer is hermetically sealed by the counter substrate 11 and the TFT substrate 12.

  The incident-side dust-proof glass 13 that functions as the incident-side substrate is provided on the incident surface of the counter substrate 11 on which light is incident. The incident side dust-proof glass 13 transmits light incident on the counter substrate 11. The exit side dust-proof glass 14 that functions as an exit side substrate is provided on the exit surface of the TFT substrate 12 on which light is emitted. The emission-side dustproof glass 14 transmits light emitted from the TFT substrate 12. The counter substrate 11, the TFT substrate 12, the incident side dustproof glass 13, and the emission side dustproof glass 14 are configured using, for example, a quartz member. The flexible substrate 15 is an external connection terminal of the liquid crystal display panel 10. The flexible substrate 15 is provided extending from the liquid crystal display panel 10 in the Z-axis direction.

  The incident side polarizing plate 16 is provided to face the incident side dust-proof glass 13. The incident side polarizing plate 16 transmits polarized light in a specific polarization direction. The liquid crystal display panel 10 changes the polarization direction of the polarized light from the incident side polarizing plate 16 according to the image signal. The exit side polarizing plate 17 is provided to face the exit side dust-proof glass 14. The exit-side polarizing plate 17 transmits the polarized light whose polarization direction has been changed by the liquid crystal display panel 10. The incident side polarizing plate 16 and the exit side polarizing plate 17 are arranged so that their polarization axes are perpendicular to each other.

  The incident side cooling duct 20 is configured by combining the first duct constituent member 22 and the second duct constituent member 23 with the incident side dustproof glass 13 and the incident side polarizing plate 16. The incident side cooling duct 20 is a cooling duct in which cooling air flows in the space between the incident side dust-proof glass 13 and the incident side polarizing plate 16. The incident-side dustproof glass 13 is fixed to a surface 26 constituting the inner surface of the incident-side cooling duct 20 among the first duct component member 22 and the second duct component member 23.

  By disposing the incident side dustproof glass 13 on the inner surface of the incident side cooling duct 20, the cooling air can be well applied to the surface of the incident side dustproof glass 13, and the liquid crystal display panel 10 can be efficiently used from the incident side dustproof glass 13 side. It can cool well. The incident-side dust-proof glass 13 is fixed in close contact with the surface 26 using, for example, an adhesive. Thereby, the incident side dust-proof glass 13 and the incident side cooling duct 20 can be fixed without a gap, and the cooling air can flow without leakage.

  The exit side cooling duct 21 is configured by combining the first duct constituent member 24 and the second duct constituent member 25 with the exit side dust-proof glass 14 and the exit side polarizing plate 17. The exit side cooling duct 21 is a cooling duct in which cooling air flows in the space between the exit side dust-proof glass 14 and the exit side polarizing plate 17. The exit-side dust-proof glass 14 is fixed to a surface 27 that constitutes the inner surface of the exit-side cooling duct 21 among the first duct constituent member 24 and the second duct constituent member 25.

  By disposing the exit side dustproof glass 14 on the inner surface of the exit side cooling duct 21, the cooling air can be well applied to the surface of the exit side dustproof glass 14, and the liquid crystal display panel 10 can be efficiently used from the exit side dustproof glass 14 side. It can cool well. The exit side dust-proof glass 14 is also fixed in close contact with the surface 27 using, for example, an adhesive. Thereby, the exit side dust-proof glass 14 and the exit side cooling duct 21 can be fixed without a gap, and the cooling air can flow without leakage.

  The incident side cooling duct 20 and the exit side cooling duct 21 both advance the cooling air in the Y-axis direction. When the cooling air is advanced in the Y-axis direction, when the plurality of electro-optical devices 1 are arranged, the cooling liquid ducts are connected to cool the plurality of liquid crystal display panels 10 through one cooling air path. Can be configured. The first duct constituent member 22 and the second duct constituent member 23 that constitute the incident side cooling duct 20 and the first duct constituent member 24 and the second duct constituent member 25 that constitute the exit side cooling duct 21 are either Also, it is configured using a member having high thermal conductivity, for example, a metal member such as aluminum or copper.

  FIG. 3 is a perspective view of the electro-optical device 1 shown in FIG. 1 with the second duct components 23 and 25 removed. The first duct constituent member 22 and the second duct constituent member 23 constituting the incident side cooling duct 20 are joined to the joint surface 31 of the first duct constituent member 22 and the joint surface 32 of the second duct constituent member 23. By doing so, they are arranged in parallel in the Z-axis direction. The joint surfaces 31 and 32 are planes parallel to the Y-axis direction in which the cooling air flows.

  The first duct constituent member 24 and the second duct constituent member 25 constituting the injection side cooling duct 21 are joined to the joint surface 33 of the first duct constituent member 24 and the joint surface 34 of the second duct constituent member 25. By doing so, they are arranged in parallel in the Z-axis direction. The joint surfaces 33 and 34 are planes parallel to the Y-axis direction in which the cooling air flows.

  Rectangular cutout portions 28 are formed on the incident side polarizing plate 16 side and the incident side dust-proof glass 13 side of the second duct constituting member 23 constituting the incident side cooling duct 20, respectively. Similarly, the first duct component member 24 is also formed with cutout portions 28 on the incident side polarizing plate 16 side and the incident side dust-proof glass 13 side. By combining the first duct component member 22 and the second duct component member 23 in which the notch portion 28 is formed, the incident-side cooling duct 20 has an incident-side polarizing plate 16 side and an incident-side dust-proof glass 13 side. A rectangular opening through which light passes is formed. The incident side polarizing plate 16 and the incident side dust-proof glass 13 are disposed so as to close the opening formed by the notch 28.

  Similarly to the incident side cooling duct 20, the emission side cooling duct 21 is also provided with a rectangular opening through which light passes. By combining the first duct component member 24 and the second duct component member 25 in which the notch portion 28 is formed, the emission side dustproof glass 14 side and the emission side polarizing plate 17 side of the emission side cooling duct 21 are provided. A rectangular opening through which light passes is formed. The exit-side dust-proof glass 14 and the exit-side polarizing plate 17 are arranged so as to close the opening formed by the cutout portion 28. In FIG. 3, the notch portion 28 shows only the second duct component member 23 constituting the incident-side cooling duct 20 provided on the incident-side polarizing plate 16 side, and the other notches are shown. The notch portion 28 is formed on the back side of the drawing of the other elements shown in the figure.

  The position where the joint surface 31 of the first duct constituent member 22 and the joint surface 32 of the second duct constituent member 23 in the incident side cooling duct 20 are joined is the same as the irradiation area in the liquid crystal display panel 10 in the Z-axis direction. It is on the XY plane. The joining position of the first duct constituent member 22 and the second duct constituent member 23 substantially coincides with the XY plane including the central axis AX. The central axis AX is a perpendicular line of the irradiation region that passes through the center of the irradiation region.

  The position where the joint surface 33 of the first duct component member 24 and the joint surface 34 of the second duct component member 25 in the exit side cooling duct 21 are joined is also on the XY plane that bisects the irradiation region in the Z-axis direction. It is in. The joining position of the first duct constituent member 24 and the second duct constituent member 25 is also substantially coincident with the XY plane including the central axis AX.

The heat dissipation path from the liquid crystal display panel 10 to the air is generally one of the following (1) to (4).
(1) Counter substrate 11 -incident side dustproof glass 13 -first duct component member 22 or second duct component member 23 -air (2) counter substrate 11 -incident side dustproof glass 13 -air (3) TFT substrate 12 -injection Side dust-proof glass 14 -first duct constituent member 24 or second duct constituent member 25 -Air (4) TFT substrate 12 -Ejection side dust-proof glass 14 -Air

  By cooling both surfaces of the liquid crystal display panel 10 on the incident side dustproof glass 13 side and the emission side dustproof glass 14 side, the liquid crystal display panel 10 can be effectively cooled. By configuring the first duct constituent members 22 and 24 and the second duct constituent members 23 and 25 using a metal member having a high thermal conductivity, in particular, the thermal resistance in the heat dissipation path of (1) and (3) can be reduced. It becomes low and can improve heat dissipation performance.

  By setting the joining position of the first duct constituent members 22 and 24 and the second duct constituent members 23 and 25 on a plane including the central axis AX, the first duct constituent members 22 and 24 side and the second duct constituent members Heat is evenly transferred to the 23 and 25 sides. Heat conduction by forming a cooling duct by joining a plurality of duct components by setting the thermally neutral position as the joining position of the incident side cooling duct 20 and the joining position of the exit side cooling duct 21 The influence on the rate can be reduced as much as possible, and the decrease in thermal conductivity can be reduced.

  The incident-side dustproof glass 13 and the exit-side dustproof glass 14 are combined with the duct-constituting members to form the incident-side cooling duct 20 and the exit-side cooling duct 21, thereby preventing the cooling air from being dissipated and the surface of the liquid crystal display panel 10. The cooling air can be efficiently advanced. Thereby, the liquid crystal display panel 10 can be cooled with high efficiency. Further, the incident side polarizing plate 16 is combined to form the incident side cooling duct 20, and the emission side polarizing plate 17 is combined to form the emission side cooling duct 21. The cooling air is efficiently advanced to 17. Thereby, it becomes possible to cool the entrance side polarizing plate 16 and the exit side polarizing plate 17 with high efficiency.

  Note that the incident side cooling duct 20 and the emission side cooling duct 21 are not limited to the case of being configured using two duct components. The incident side cooling duct 20 and the exit side cooling duct 21 may be configured by combining a plurality of duct constituent members, or may be configured using three or more duct constituent members. The electro-optical device 1 is not limited to the configuration including the incident side polarizing plate 16 and the emission side polarizing plate 17. The electro-optical device 1 may be used in combination with an incident-side polarizing plate and an exit-side polarizing plate that are separately provided. In this case, it is desirable to provide a transparent member that closes the opening on the light incident side of the incident side cooling duct 20 and a transparent member that closes the opening on the light emitting side of the emission side cooling duct 21. . Thereby, the incident side cooling duct 20 and the exit side cooling duct 21 are configured by combining the transparent members.

  The electro-optical device 1 is not limited to the case where the cooling duct that advances the cooling air in the Y-axis direction is provided, and may include a cooling duct that advances the cooling air in the Z-axis direction. In order to advance the cooling air in the Z-axis direction, the incident side cooling duct 20 and the emission side cooling duct 21 described in the present embodiment are configured to be rotated 90 degrees around the X axis. Furthermore, the electro-optical device 1 is not limited to the configuration including both the incident-side cooling duct 20 and the emission-side cooling duct 21, and may be any device including at least one.

  FIG. 4 is a perspective view of an electro-optical device 40 according to a modification of the present embodiment. The present modification is characterized in that the first duct constituent members 41 and 43 and the second duct constituent members 42 and 44 are arranged in parallel in the Y-axis direction. The first duct constituent member 41 and the second duct constituent member 42 constituting the incident side cooling duct 20 are joined by a joining surface forming an XZ plane perpendicular to the Y-axis direction in which the cooling air flows. The first duct constituent member 43 and the second duct constituent member 44 constituting the injection side cooling duct 21 are joined at a joining surface forming a plane perpendicular to the Y-axis direction in which the cooling air flows.

  The joining position of the first duct constituent member 41 and the second duct constituent member 42 in the incident side cooling duct 20 substantially coincides with the XZ plane including the central axis AX. The joining position of the first duct constituent member 43 and the second duct constituent member 44 in the exit side cooling duct 21 is also substantially coincident with the XZ plane including the central axis AX. Also in this modification, the liquid crystal display panel 10 (see FIG. 3), the incident side polarizing plate 16, and the emission side polarizing plate 17 (see FIG. 3) can be cooled with high efficiency.

  FIG. 5 is an XZ sectional view of the electro-optical device 50 according to the second embodiment of the invention. In the electro-optical device 50 according to the present embodiment, the incident-side dust-proof glass 13 is fixed to the surface 53 constituting the outer surface of the incident-side cooling duct 20, and the emission side is disposed on the surface 54 constituting the outer surface of the emission-side cooling duct 21. The dust-proof glass 14 is fixed. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The incident side cooling duct 20 is configured by combining the duct constituent member 51 with the incident side dust-proof glass 13 and the incident side polarizing plate 16. The incident-side dustproof glass 13 is fixed to a surface 53 of the duct constituent member 51 that constitutes the outer surface of the incident-side cooling duct 20. By arranging the incident-side dustproof glass 13 on the outer surface of the incident-side cooling duct 20, the incident-side cooling duct 20 can be configured without dividing the duct constituent member 51 into a plurality of pieces. The incident-side dust-proof glass 13 is fixed in close contact with the surface 53 using, for example, an adhesive. Thereby, the incident side dust-proof glass 13 and the incident side cooling duct 20 can be fixed without a gap, and the cooling air can flow without leakage.

  The exit side cooling duct 21 is configured by combining the duct constituent member 52 with the exit side dustproof glass 14 and the exit side polarizing plate 17. The exit side dust-proof glass 14 is fixed to a surface 54 of the duct constituent member 52 that constitutes the outer surface of the exit side cooling duct 21. By disposing the exit side dustproof glass 14 on the outer surface of the exit side cooling duct 21, the exit side cooling duct 21 can be configured without dividing the duct constituent member 52 into a plurality of parts. The exit side dust-proof glass 14 is fixed in close contact with the surface 54 using, for example, an adhesive. Thereby, the exit side dust-proof glass 14 and the exit side cooling duct 21 can be fixed without a gap, and the cooling air can flow without leakage.

  Rectangular openings are respectively formed on the incident-side polarizing plate 16 side and the incident-side dust-proof glass 13 side of the duct constituent member 51 constituting the incident-side cooling duct 20. The incident side polarizing plate 16 and the incident side dust-proof glass 13 are disposed so as to close the opening. Similarly, an opening is formed in the duct component member 52 constituting the injection side cooling duct 21. The exit side dust-proof glass 14 and the exit side polarizing plate 17 are disposed so as to close the opening.

  Each of the duct constituent members 51 and 52 is configured using a member having high thermal conductivity, for example, a metal member such as aluminum or copper. In the present embodiment, the incident-side cooling duct 20 and the exit-side cooling duct 21 can be configured by duct constituent members 51 and 52 each consisting of one member, so that heat conduction by dividing the duct constituent members is performed. The influence on the rate can be eliminated and the thermal conductivity can be increased. Further, the manufacturing can be facilitated as compared with the configuration in which a plurality of duct constituent members are joined.

  FIG. 6 is a schematic configuration diagram of a projector 60 according to the third embodiment of the invention. The projector 60 is a front projection type projector that projects projection light onto the screen 79 and observes the image by observing the light reflected by the screen 79. The projector 60 includes an R-light electro-optical device 69R, a G-light electro-optical device 69G, and a B-light electro-optical device 69B configured in the same manner as the electro-optical device 1 described in the first embodiment. Hereinafter, the same parts as those in the first embodiment will be described with the same reference numerals.

  The light source unit 61 emits light including R light, G light, and B light. The light source unit 61 is, for example, an ultra high pressure mercury lamp. The first integrator lens 62 and the second integrator lens 63 have a plurality of lens elements arranged in an array. The first integrator lens 62 divides the light flux from the light source unit 61 into a plurality of parts. Each lens element of the first integrator lens 62 condenses the light beam from the light source unit 61 in the vicinity of the lens element of the second integrator lens 63. The lens element of the second integrator lens 63 forms an image of the lens element of the first integrator lens 62 on the liquid crystal display panel 10 (see FIG. 1).

  The polarization conversion element 64 converts light that has passed through the two integrator lenses 62 and 63 into linearly polarized light having a specific polarization direction. The superimposing lens 65 superimposes the image of each lens element of the first integrator lens 62 on the irradiation surface of the liquid crystal display panel 10. The first integrator lens 62, the second integrator lens 63, and the superimposing lens 65 make the light intensity distribution from the light source unit 61 uniform over the irradiation area of the liquid crystal display panel 10.

  The first dichroic mirror 66 reflects R light incident from the superimposing lens 65 and transmits G light and B light. The R light incident from the superimposing lens 65 has its optical path bent by the first dichroic mirror 66 and the reflection mirror 67, and enters the R light field lens 68R. The R light field lens 68R collimates the R light from the reflection mirror 67 and makes it incident on the R light electro-optical device 69R. The R light electro-optical device 69R modulates the R light according to the image signal. The R light modulated by the R light electro-optical device 69R enters the cross dichroic prism 70 which is a color synthesis optical system.

  The second dichroic mirror 71 reflects the G light from the first dichroic mirror 66 and transmits the B light. The optical path of the G light from the first dichroic mirror 66 is bent by the second dichroic mirror 71 and enters the G light field lens 68G. The G light field lens 68G collimates the G light from the second dichroic mirror 71 and makes it incident on the G light electro-optical device 69G. The G light electro-optical device 69G modulates the G light according to the image signal. The G light modulated by the G light electro-optical device 69 </ b> G enters the cross dichroic prism 70.

  The B light transmitted through the second dichroic mirror 71 is transmitted through the relay lens 72, and then the optical path is bent by reflection at the reflection mirror 73. The B light from the reflection mirror 73 further passes through the relay lens 74, and then the optical path is bent by reflection by the reflection mirror 75, and enters the B light field lens 68B.

  Since the optical path of the B light is longer than the optical path of the R light and the optical path of the G light, a relay lens 72 is included in the optical path of the B light in order to make the illumination magnification in the irradiation area of the liquid crystal display panel 10 equal to that of other color lights. , 74 is used. The B light field lens 68B collimates the B light from the reflection mirror 75 and makes it incident on the B light electro-optical device 69B. The B light electro-optical device 69B modulates the B light according to the image signal. The B light modulated by the B light spatial light modulator 69 </ b> B enters the cross dichroic prism 70.

  The cross dichroic prism 70 has two dichroic films 76 and 77 arranged orthogonal to each other. The first dichroic film 76 reflects R light and transmits G light and B light. The second dichroic film 77 reflects B light and transmits R light and G light. The cross dichroic prism 70 combines the R light, G light, and B light incident from different directions and emits the light in the direction of the projection lens 78. The projection lens 78 projects the light combined by the cross dichroic prism 70 toward the screen 79.

  FIG. 7 is a schematic plan view of a cooling structure for cooling the electro-optical devices 69R, 69G, and 69B for each color light. The fan 80 is a cooling air supply unit that supplies cooling air, and is, for example, a sirocco fan. The fan 80 takes in air from outside the housing of the projector 60 and supplies cooling air that causes the incident-side cooling duct 20 and the emission-side cooling duct 21 of the electro-optical devices 69B, 69G, and 69R for each color light to flow. The cooling air supply unit is not limited to a sirocco fan, and any device that can supply cooling air may be used.

  The first duct coupling portion 81 and the second duct coupling portion 82 are both duct coupling portions that couple the cooling ducts of the electro-optical device. The first duct coupling portion 81 includes the incident side cooling duct 20 and the emission side cooling duct 21 of the R light electro-optical device 69R, and the incident side cooling duct 20 and the emission side cooling of the G light electro optical device 69G. The duct 21 is coupled. The second duct coupling portion 82 includes the incident side cooling duct 20 and the emission side cooling duct 21 of the G light electro-optical device 69G, and the incident side cooling duct 20 and the emission side cooling of the B light electro optical device 69B. The duct 21 is coupled.

  The electro-optical device 69R for R light and the electro-optical device 69G for G light are arranged with the central axis AX (see FIG. 3) different from each other by approximately 90 degrees. The electro-optical device 69G for G light and the electro-optical device 69B for B light are arranged with the central axis AX different by approximately 90 degrees. Each of the first duct coupling portion 81 and the second duct coupling portion 82 is a piping component that forms a flow path that is bent so that the traveling direction of the cooling air is changed by approximately 90 degrees. Each of the first duct coupling portion 81 and the second duct coupling portion 82 is configured using a member having high thermal conductivity, for example, a metal member such as aluminum or copper.

  In both the first duct coupling portion 81 and the second duct coupling portion 82, the cooling air entering from the incident side cooling duct 20 and the cooling air entering from the exit side cooling duct 21 travel through a common flow path. Is configured to do. In addition, the first duct coupling portion 81 and the second duct coupling portion 82 are configured such that the cooling air that has entered from the incident side cooling duct 20 and the cooling air that has entered from the exit side cooling duct 21 have different flow paths. It is good also as a structure which partitions off an inside so that it may advance.

  The cooling air from the fan 80 is supplied to the incident side cooling duct 20 and the emission side cooling duct 21 of the B light electro-optical device 69B. The cooling air that has passed through the incident-side cooling duct 20 and the exit-side cooling duct 21 of the B-light electro-optical device 69B passes through the second duct coupling portion 82 and is incident-side cooled on the G-light electro-optical device 69G. Supplied to the duct 20 for injection and the cooling duct 21 on the injection side. The cooling air that has passed through the incident-side cooling duct 20 and the exit-side cooling duct 21 of the G light electro-optical device 69G passes through the first duct coupling portion 81, and enters the R-light electro-optical device 69R. Supplied to the duct 20 for injection and the cooling duct 21 on the injection side. The cooling air that has passed through the incident-side cooling duct 20 and the emission-side cooling duct 21 of the R light electro-optical device 69 </ b> R is discharged outside the housing of the projector 60. In this manner, the cooling air supplied from the fan 80 sequentially flows through the color light electro-optical devices 69B, 69G, and 69R.

  The projector 60 arranges the incident-side cooling duct 20 and the emission-side cooling duct 21 so that the cooling air travels in a direction parallel to the plane including the optical axis. Accordingly, the incident-side cooling duct 20 and the emission-side cooling duct 21 of each color light electro-optical device 69R, 69G, 69B are coupled using the first duct coupling portion 81 and the second duct coupling portion 82. Can be. As a result, each color light electro-optical device 69R, 69G, 69B can be cooled by flowing the cooling air through the common flow path. Further, heat dissipation through the first duct coupling portion 81 and the second duct coupling portion 82 is also possible.

  By configuring the first duct coupling portion 81 and the second duct coupling portion 82 using a metal member having high thermal conductivity, the thermal resistance in the heat dissipation path passing through the first duct coupling portion 81 and the second duct coupling portion 82 The heat dissipation performance can be increased. By using the electro-optical devices 69R, 69G, and 69B for each color light configured similarly to the first embodiment, the liquid crystal display panel 10, the incident side polarizing plate 16, and the emission side polarizing plate 17 can be efficiently cooled. . By efficiently cooling the liquid crystal display panel 10, the incident side polarizing plate 16, and the exit side polarizing plate 17, deterioration of the liquid crystal display panel 10, the incident side polarizing plate 16, and the exit side polarizing plate 17 is reduced. Further, by enabling efficient cooling, the amount of cooling air to be flowed can be reduced, and the driving sound of the fan 80 can be reduced. Thereby, the projector 60 is excellent in silence and can obtain high reliability.

  When the light from the light source unit 61 includes ultraviolet rays, the ultraviolet rays may travel with the B light in the optical path shown in FIG. By first supplying the cooling air from the fan 80 to the electro-optical device 69B for the B light among the electro-optical devices 69B, 69G, and 69R for each color light, it is possible to effectively reduce deterioration due to absorption of ultraviolet rays. The order in which the cooling air flows in the electro-optical devices 69B, 69G, and 69R for each color light is not limited to the case described in the present embodiment, and may be changed as appropriate. The 1st duct coupling | bond part 81 and the 2nd duct coupling | bond part 82 are not restricted to comprising using a metal member, You may comprise using another member, for example, a resin member.

  The projector 60 is not limited to the configuration in which the first duct coupling portion 81 and the second duct coupling portion 82 are provided, and may be any configuration in which at least one duct coupling portion is provided, and any position in the path of the cooling air from the fan 80. It is good also as providing a duct coupling part. For example, the projector 60 may be provided with a duct connecting portion at the cooling air outlet of the fan 80. By providing the duct connecting portion at the outlet of the fan 80, the cooling air can be efficiently supplied to the cooling duct according to the position and orientation of the fan 80. The shape of the duct connecting portion is not limited to that described in the present embodiment, and may be appropriately modified according to the arrangement of the fan 80 and the cooling duct.

  As described above, the electro-optical device according to the invention is suitable for use in a projector.

  DESCRIPTION OF SYMBOLS 1 Electro-optical device, 10 Liquid crystal display panel, 11 Opposite substrate, 12 TFT substrate, 13 Incident side dustproof glass, 14 Outgoing side dustproof glass, 15 Flexible substrate, 16 Incident side polarizing plate, 17 Outgoing side polarizing plate, 20 Incident side cooling Duct, 21 injection side cooling duct, 22, 24 first duct component, 23, 25 second duct component, 26, 27 face, 28 notch, 31, 32, 33, 34 joint face, AX center Axis, 40 Electro-optical device, 41, 43 First duct component, 42, 44 Second duct component, 50 Electro-optical device, 51, 52 Duct component, 53, 54 surface, 60 Projector, 61 Light source unit, 62 First integrator lens, 63 Second integrator lens, 64 Polarization conversion element, 65 Superimposing lens, 66 First die Loic mirror, 67 reflection mirror, 68R R light field lens, 68G G light field lens, 68B B light field lens, 69R R light electro-optical device, 69G G light electro-optical device, 69B B light electro-optical device Device, 70 Cross dichroic prism, 71 Second dichroic mirror, 72, 74 Relay lens, 73, 75 Reflective mirror, 76 First dichroic film, 77 Second dichroic film, 78 Projection lens, 79 Screen, 80 Fan, 81 First Duct joint, 82 Second duct joint

Claims (13)

A first substrate and a second substrate sandwiching the liquid crystal layer;
An incident-side substrate that transmits light incident on the first substrate;
An emission side substrate that transmits light emitted from the second substrate, and a liquid crystal display panel comprising:
A duct constituting member that constitutes a cooling duct through which cooling air for cooling the liquid crystal display panel flows, together with the incident side substrate;
An electro-optical device comprising: at least one of a cooling duct through which cooling air for cooling the liquid crystal display panel flows and a duct constituent member configured together with the emission side substrate.   2. The electro-optical device according to claim 1, wherein at least one of the incident-side substrate and the emission-side substrate is fixed to a surface of the duct constituent member that constitutes an inner surface of the cooling duct.   The electro-optical device according to claim 2, wherein the cooling duct is configured by combining a plurality of the duct constituent members. The plurality of duct constituent members include a first duct constituent member and a second duct constituent member,
4. The electricity according to claim 3, wherein the first duct constituent member and the second duct constituent member are joined at a joint surface substantially parallel to a direction in which the cooling air flows in the cooling duct. Optical device. The plurality of duct constituent members include a first duct constituent member and a second duct constituent member,
The said 1st duct structural member and the said 2nd duct structural member are joined by the joint surface substantially perpendicular | vertical with respect to the direction in which the said cooling air flows in the said cooling duct. Electro-optic device. When the vertical axis of the irradiation region passing through the center of the irradiation region in the liquid crystal display panel is a central axis,
6. The electro-optical device according to claim 4, wherein a joining position between the first duct constituent member and the second duct constituent member substantially coincides with a plane including the central axis.   2. The electro-optical device according to claim 1, wherein at least one of the incident side substrate and the emission side substrate is fixed to a surface of the duct constituent member that constitutes an outer surface of a cooling duct.   The electro-optical device according to claim 1, wherein the duct constituent member is configured using a metal material. An incident-side polarizing plate provided to face the incident-side substrate;
The electro-optical device according to claim 1, wherein the incident-side polarizing plate constitutes the cooling duct together with the duct constituent member and the incident-side substrate. An emission-side polarizing plate provided to face the emission-side substrate;
The electro-optical device according to claim 1, wherein the exit-side polarizing plate constitutes the cooling duct together with the duct constituent member and the exit-side substrate. A light source unit for emitting light;
The electro-optical device according to claim 1, which modulates light emitted from the light source unit according to an image signal;
And a cooling air supply unit for supplying the cooling air for flowing the cooling duct. A plurality of the electro-optical devices;
The projector according to claim 11, further comprising a duct coupling portion that couples the cooling ducts of the electro-optical device.   The projector according to claim 12, wherein the duct coupling portion is configured using a metal member.

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