JP2008083178A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of heating a liquid crystal device used as an optical modulation element inexpensively in a space saving state and making the bend transition of the liquid crystal device progress rapidly. <P>SOLUTION: When the alignment state of liquid crystal molecules is transited from splay alignment to bend alignment, a heat conduction member 61 is moved to a position where it comes close to a light irradiation area 37a, whereby heat is transmitted from the heat conduction member 61 to the light irradiation area 37, and the temperature of a liquid crystal layer during the bend transition is made high. Thus, time required for the bend transition is shortened. Besides, since a large-scale heating mechanism as shown in the conventional manner is not mounted, the reduction of cost and the space saving are achieved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector equipped with an OCB (Optical Compensated Bend) mode liquid crystal device as a light modulation element.

  In the field of liquid crystal devices used in liquid crystal projectors, there is a demand for improving the quality of moving images as well as still images. In order to improve the quality of moving images, it is essential to increase the response speed of the liquid crystal device. In recent years, an OCB (Optical Compensated Bend) mode liquid crystal device with high response speed has attracted attention.

  In the OCB mode liquid crystal device, the alignment of liquid crystal molecules changes between an initial state and a display operation state. In the initial state, the orientation of the liquid crystal molecules is regulated so as to open in a splayed manner between the two substrates (spray orientation). In the display operation state, the alignment of the liquid crystal molecules is regulated so as to be bent like a bow between the two substrates (bend alignment).

  When image display or light modulation is performed with an OCB mode liquid crystal device, a drive voltage is applied in a bend alignment state. In the bend alignment state, the time until the alignment of the liquid crystal molecules is switched when a voltage is applied is shorter than in the TN mode or STN mode, so that the light transmittance can be changed in a short time, and high speed Response is possible.

In the OCB mode liquid crystal device, when the alignment of the liquid crystal molecules is changed from the splay alignment to the bend alignment, it is necessary to apply a voltage higher than a certain threshold voltage to the liquid crystal layer (initial transition operation). If the initial transfer operation is insufficient, the change from the splay alignment to the bend alignment becomes insufficient, resulting in poor display or a low response speed. Inducing this bend transition only by applying a voltage requires a time of several seconds to several minutes, so the time is actually reduced by other means. For example, as shown in Patent Document 1, a method of heating a liquid crystal device by attaching a heating device is described. Since the bend transition proceeds faster as the temperature is higher, the transition time can be shortened by heating.
JP 2002-250909 A

However, particularly when a heat source such as a heating device is separately attached to a liquid crystal device used in a light modulation device such as a projector, the entire device is large and takes up space, resulting in an increase in size of the projector. In addition, this increases the cost.
In view of the circumstances as described above, an object of the present invention is to provide a projector capable of heating a liquid crystal device used as a light modulation element at low cost and in a space-saving manner and allowing the bend transition of the liquid crystal device to proceed rapidly. It is to provide.

To achieve the above object, a projector according to the present invention includes a light source, a light modulation element that has a light irradiation region irradiated with light from the light source, and modulates the light irradiated to the light irradiation region, and A projector including a projection lens that projects light modulated by a light modulation element, wherein the light modulation element includes a pair of substrates disposed opposite to each other and a liquid crystal layer sandwiched between the pair of substrates. And a liquid crystal device that performs light modulation by changing the alignment state of the liquid crystal molecules in the liquid crystal layer from splay alignment to bend alignment, and is capable of blocking the light irradiated to the light irradiation region and the light irradiation. It is characterized by comprising a heat conducting member that is movably provided at a position close to the region.
The present invention is an invention in a projector using a so-called OCB mode liquid crystal device that performs light modulation by changing the alignment state of liquid crystal molecules in a liquid crystal layer from splay alignment to bend alignment as a light modulation element. According to the configuration of the present invention, since the light irradiated to the light irradiation region of the liquid crystal device can be shielded and provided with a heat conduction member that is movably provided at a position close to the light irradiation region, When the conductive member is moved to this position, the heat conductive member absorbs light from the light source and generates heat, and transmits this heat to a nearby light modulation element. For this reason, for example, when the alignment state of the liquid crystal molecules is changed from the splay alignment to the bend alignment, the heat transfer member can be moved to the above position to transfer heat from the heat transfer member to the light irradiation region. The temperature of the light modulation element (liquid crystal device) during the transition can be increased. Thereby, the time required for bend transition can be shortened. In addition, since there is no need to mount a large heating mechanism as in the prior art, cost reduction and space saving can be achieved.

The projector is characterized in that the heat conducting member is movably provided at a position in contact with the light modulation element.
According to the present invention, since the heat conducting member is movably provided at a position in contact with the light modulation element, the heat generated by the heat conduction member can be directly conducted to the light modulation element. Thereby, the temperature of a light modulation element can be raised efficiently.

The projector is characterized in that the heat conducting member has a convex portion at a portion in contact with the light modulation element.
According to the present invention, since the heat conducting member has a convex portion in contact with the light modulation element, the heat generated by the heat conduction member can be directly conducted to the light modulation element, and the heat conduction member. It is possible to prevent the light modulation element from being damaged as much as possible by contacting only the convex portion instead of contacting the entire surface.

The projector is provided with a plurality of the heat conducting members, and each of the plurality of heat conducting members is movably provided at a different position.
According to the present invention, a plurality of heat conducting members are provided, and each of the plurality of heat conducting members is movably provided at different positions. It can be provided as a heat conducting member. In this way, it is possible to design with a small turn. Further, the moving range of the heat conducting member can be made smaller when moving a plurality of small heat conducting members than when moving one large heat conducting member. Thereby, space saving can be achieved.

In the projector, each of the plurality of heat conducting members is provided to be movable from different directions with respect to the light modulation element.
According to the present invention, since each of the plurality of heat conducting members is provided so as to be movable from different directions with respect to the light modulation element, for example, the heat conducting member can be moved at the shortest distance. . Thus, space saving can be achieved by minimizing the movement of the heat conducting member.

The projector is characterized in that a first shielding part is provided on at least a part of one of the plurality of heat conducting members.
According to the present invention, since the first shielding portion is provided on at least a part of one of the plurality of heat conducting members, for example, when the plurality of heat conducting members move to the different positions described above. In addition, the gap with the other heat conducting member is covered with the first shielding part. For this reason, it can prevent that light leaks from the clearance gap between the boundary parts of a some heat conductive member, and can increase the light quantity of the light to absorb. Thereby, the amount of heat generated by the heat conducting member can be increased, and a large amount of heat can be transmitted to the light modulation element.

The projector is characterized in that the heat conducting member has a second shielding part capable of shielding a peripheral part of the light irradiation region.
According to the present invention, since the heat conducting member has the second shielding part capable of shielding the peripheral part of the light irradiation region, light can be prevented from leaking to the peripheral part of the light irradiation region and absorbed. The amount of light can be increased. Thereby, the amount of heat generated by the heat conducting member can be increased, and a large amount of heat can be transmitted to the light modulation element.

The projector further includes movement control means for controlling movement of the heat conducting member so that the heat conducting member moves to the position at the time of bend transition in which the alignment state of the liquid crystal molecules is transitioned from splay alignment to bend alignment. It is characterized by comprising.
According to the present invention, there is further provided movement control means for controlling the heat conducting member so that the heat conducting member moves to the above position at the bend transition in which the alignment state of the liquid crystal molecules is changed from the splay alignment to the bend alignment. Therefore, the heat conducting member can be automatically moved even when the projector is driven.

The projector is characterized in that at least a part of the light modulation element is covered with a frame, and the heat conducting member is in contact with the frame when the bend transition is not performed.
According to the present invention, since at least a part of the light modulation element is covered with the frame, and the heat conducting member is in contact with the frame when the bend is not transferred, the heat is dissipated when the bend is not transferred. The heat conducting member can be cooled as a fin. Thereby, it is possible to prevent the temperature of the projector from becoming too high during driving.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing used for the following description, the scale is appropriately changed for each layer and each member so that each layer and each member can be recognized in the drawing.
FIG. 1 is a diagram schematically showing the overall configuration of the projector 1.
The projector 1 is mainly composed of an image display device 2, a projection lens 3, and an activation control unit 5.

The image display device 2 includes a light source 10, a uniform illumination system 20, and a color modulation unit 30.
The light source 10 includes a lamp 11 that emits white light, such as a metal halide lamp, an ultra-high pressure mercury lamp, or a xenon lamp, and a reflector 12 that reflects and collects the white light emitted from the lamp 11. As the reflector 12, a parabolic mirror is preferably used.

  The uniform illumination system 20 is an optical system that uniformizes the luminance distribution of white light from the light source 10, and includes a first lens array 21, a second lens array 22, a polarization conversion element 23, and a condenser lens 24. Have. The first lens array 21 and the second lens array 22 are arranged on the light emission side of the light source 10. The first lens array 21 and the second lens array 22 are optical members made of, for example, fly-eye lenses and the like, and uniformize the light luminance distribution. The polarization conversion element 23 is disposed on the light exit side of the second lens array 22 and is an optical element that aligns the polarization direction of light in one direction. The condenser lens 24 is a lens disposed on the light exit side of the polarization conversion element 23.

  The color modulation unit 30 is a part that modulates the luminances of the three primary colors of red (R), green (G), and blue (B) in the wavelength region of white light incident from the uniform illumination system 20. Dichroic mirrors 31a, 31b, three mirrors 32a, 32b, 32c, five field lenses (lens 33, relay lens 34, collimating lenses 35R, 35G, 35B), and three shutter portions 36R, 36G, 36B Three liquid crystal light valves 37R, 37G, and 37B and a cross dichroic prism 38 are provided.

  The dichroic mirrors 31a and 31b are optical members for separating (spectralizing) white light into RGB three primary color lights. The dichroic mirror 31a is disposed on the light exit side of the condenser lens 24 so as to be inclined by 45 ° with respect to the light traveling direction. The dichroic mirror 31a includes a dichroic film that reflects blue light and green light and transmits red light. It is configured to be attached to a light transmissive substrate such as a glass plate. The dichroic mirror 31b is disposed on the light reflection side of the dichroic mirror 31a so as to be inclined by 45 ° with respect to the light traveling direction. The dichroic mirror 31b reflects green light and transmits blue light. The structure is affixed to a light transmissive substrate.

  The lens 33 and the relay lens 34 are optical members that transmit the light transmitted through the dichroic mirror 31b to the collimating lens 35B. The lens 33 is disposed on the light transmission side of the dichroic mirror 31b, and is provided to allow light to enter the relay lens 34 efficiently.

The collimating lenses 35R, 35G, and 35B are disposed on the light incident side of the corresponding liquid crystal light valves 37R, 37G, and 37B, and substantially parallelize the principal rays of the respective color lights incident on the liquid crystal light valves 37R, 37G, and 37B. It is a convex lens.
The shutter portions 36R, 36G, and 36B are provided on the light source 10 side with respect to the liquid crystal light valves 37R, 37G, and 37B, and can block light from the light source 10.

  The liquid crystal light valves 37R, 37G, and 37B are active matrix type and OCB mode liquid crystal devices, and polarizing plates are attached to the light incident surface and the light emission surface, respectively. FIG. 2 is an explanatory diagram of the alignment state of the liquid crystal in the OCB mode liquid crystal device. The liquid crystal device used for the liquid crystal light valves 37R, 37G, and 37B includes a pair of substrates 51 and 52 that are disposed to face each other, and a liquid crystal layer 53 that is sandwiched between the pair of substrates 51 and 52. In the OCB mode liquid crystal device, in the initial state (non-operation), the alignment of the liquid crystal molecules 54 is in a splayed state (splay alignment) as shown in FIG. As shown in FIG. 2B, the orientation of the liquid crystal molecules 54 is bent (bend orientation).

  The cross dichroic prism 38 has a structure in which four right-angle prisms are bonded together. A dielectric multilayer film (blue light reflecting dichroic film 38a) that reflects blue light is formed on the bonding surface of these right-angle prisms, and a red color. A dielectric multilayer film (red light reflecting dichroic film 38b) that reflects light is formed.

  FIG. 3 is a perspective view showing the external configuration of the shutter portions 36R, 36G, and 36B and the liquid crystal light valves 37R, 37G, and 37B. Since the configurations of the shutter unit and the liquid crystal light valve are the same in the optical paths of red light, green light, and blue light, FIG. 3 and subsequent figures are collectively referred to as “shutter unit 36” and “liquid crystal light valve 37”. Will be described.

  The liquid crystal light valve 37 has a light irradiation region 37a and a peripheral region 37b. The light irradiation region 37a is a region irradiated with light from the light source 10 on the surface on the light source 10 side. The light irradiated to the light irradiation region 37a is modulated and used for display. The peripheral region 37 b is a region around the light irradiation region 37 a and is covered with the frame 60. A driver (light valve driver) 40 that controls the operation of the liquid crystal light valve 37 is provided in the peripheral region 37b. The frame 60 is made of a metal such as aluminum as a main component, and covers the peripheral portion of the liquid crystal light valve 37 including the peripheral region 37b.

The shutter part 36 is mainly composed of a heat conducting member 61, a guide mechanism 62, and a shutter control driver 63.
The heat conducting member 61 is a plate-like member composed mainly of a material having a high light absorptance and high heat conductivity, and is made of, for example, black chrome or aluminum whose surface is treated. One heat conducting member 61 is provided on one side 60 a side (hereinafter referred to as “upper side”) of the frame 60 extending in the longitudinal direction of the liquid crystal light valve 37, and faces the side 60 a of the frame 60. Another one is provided on the side 60b side (hereinafter referred to as “lower side”). The heat conducting member 61 is formed to have its own longitudinal direction in the longitudinal direction of the liquid crystal light valve 37. A connection portion 64 connected to the guide mechanism 62 is provided at one end of each heat conducting member 61. The surface 61f on the liquid crystal light valve 37 side of the heat conducting member 61 is a flat surface.

  The heat conducting member 61 has a thickness that can absorb the light irradiated to the light irradiation region 37a of the liquid crystal light valve 37, and can block the light, and the surface 61f has the light irradiation region 37a. It is movably provided at a position 70 that comes into contact with. Of the two heat conducting members 61, the upper heat conducting member 61 is movable to a position covering the upper half of the light irradiation region 37 a of the liquid crystal light valve 37. The lower heat conducting member 61 is movable to a position that covers the lower half of the light irradiation region 37 a of the liquid crystal light valve 37. In this way, the two heat conducting members 61 are arranged on the upper side and the lower side with respect to the liquid crystal light valve 37, and are moved from different directions with respect to the liquid crystal light valve 37, thereby moving the heat conducting members from the same direction. Since the moving distance is shorter than the case, the moving space of the heat conducting member 61 can be narrowed.

  A shielding part (first shielding part) 61 b is formed on the lower side of the upper heat conducting member 61. The shield 61b can cover a boundary portion 61a formed between the heat conducting member 61 and the lower heat conducting member 61 when the heat conducting member 61 moves to the position 70. Further, a shielding part (second shielding part) 61c is formed on the upper side of the upper heat conducting member 61. The shield 61c can cover the space between itself and the frame 60 when moved to a position close to the light irradiation region 37a. On the lower side of the lower heat conducting member 61, a shielding part (second shielding part) 61d is provided. The shield 61d can cover between itself and the frame 60 when moved to a position close to the light irradiation region 37a. The shielding part 61b, the shielding part 61c, and the shielding part 61d are formed so as to protrude in a L-shaped cross section toward the light source 10 side.

  The guide mechanism 62 is mainly composed of a column 65 and a guide rail 66. The support | pillar 65 is arrange | positioned at the side in which the connection part 64 was provided among the heat conductive members 61, and has comprised the rectangular parallelepiped. One of the columns 65 is arranged with one surface 65a facing the liquid crystal light valve 37 side. The guide rail 66 is two parallel rails provided on the surface 65 a of the support column 65. Each rail is provided so as to sandwich the connecting portion 64 of the heat conducting member 61. Each rail extends in a curvilinear shape from the end of the column 65 to the center, and extends toward the liquid crystal light valve 37 as it reaches the center. The heat conducting member 61 is moved along the guide rail 66.

  The shutter control driver 63 is a control unit that controls the timing and amount of movement of the heat conducting member 61 and is provided, for example, in the support 65 of the guide mechanism 62. The shutter control driver 63 and the guide mechanism 62 constitute movement control means for moving the heat conducting member 61.

FIG. 4 is a block diagram showing the configuration of the control system of the projector 1.
As shown in the figure, the control system of the projector 1 is composed mainly of an activation control unit 5, a light valve driver 40, and a shutter control driver 63. The activation control unit 5 is supplied with an activation signal from an external mechanism such as a power source. The light valve driver 40 is supplied with an image signal from an external mechanism such as a personal computer. The activation control unit 5 is connected to the light valve driver 40 and the shutter control driver 63, and can supply control signals to these drivers.

Next, the operation of the projector configured as described above will be described. FIG. 5 is a flowchart showing the operation steps from starting up to ending the projector.
As shown in FIG. 5, when the projector 1 is activated (step 1), an activation signal is supplied to the activation controller 5. As shown in FIG. 6, the state of the shutter unit 36 before starting the projector 1 is that the heat conducting member 61 of the shutter unit 36 does not cover the light irradiation region 37 a of the liquid crystal light valve 37, and the light from the light source 10 is not affected. On the other hand, the light irradiation region 37a is exposed. Note that FIG. 6 is an explanatory diagram mainly relating to the position of the heat conducting member 61, and illustration of the guide rail 66 and the like is omitted.

  When the activation signal is supplied, the activation control unit 5 controls to turn on the light source 10 (step 2). When the light source 10 is turned on, the shutter control driver 63 controls to move the heat conducting member 61 of the shutter unit 36 (step 3). The heat conduction members 61 on the upper side and the lower side of the shutter part 36 move to a position 70 shown in FIG. As a result, as shown in FIG. 7, the surfaces 61 f of the upper and lower heat conduction members 61 are in close contact with the light irradiation region 37 a of the liquid crystal light valve 37, and the light irradiation region 37 a is covered with the heat conduction member 61. A boundary 61a between the upper and lower heat conducting members 61 is covered with a shielding portion 61b. The space between the upper and lower heat conducting members 61 and the frame 60 is covered with a shielding part 61c and a shielding part 61d. The light L from the light source 10 is applied to the heat conducting member 61, and the heat conducting member 61 absorbs this light and generates heat. This heat is transmitted to the liquid crystal layer 53 of the liquid crystal light valve 37 through the light irradiation region 37a in close contact with the heat conducting member 61, and the liquid crystal layer 53 is heated.

  With the temperature of the liquid crystal layer 53 raised, the light valve driver 40 applies a voltage to the liquid crystal layer 53 to perform bend transition (step 4). When a predetermined time elapses after the voltage application is started, the alignment of the liquid crystal molecules in the liquid crystal layer is changed from the splay alignment to the bend alignment, and the liquid crystal light valve 37 is in a state capable of light modulation. Here, it is considered that the liquid crystal light valve 37 is in a state in which light modulation is possible when the predetermined time has elapsed since the voltage was applied to the liquid crystal layer, and an image signal is input to the light valve driver 40 from the outside, for example. (Step 5). When the image signal is input to the light valve driver 40, the shutter control driver 63 controls the heat conducting member 61 to move to the original position (position shown in FIG. 6) (step 6). As the heat conducting member 61 moves, the light irradiation region 37a is exposed. Light from the light source 10 is irradiated to the exposed light irradiation region 37a, light modulation is performed by the liquid crystal light valve 37, and an image is displayed (step 7). When the power source of the projector 1 is turned off, the start-up of the projector 1 is completed with the heat conducting member 61 kept open as shown in FIG. 6 (step 8).

  As described above, according to the present embodiment, the light irradiated to the light irradiation region 37a of the liquid crystal light valve 37 can be blocked and can be moved to a position close to the light irradiation region 37a. Since the heat conduction member 61 that can transmit heat generated by absorbing the light to the vicinity thereof is provided, when the heat conduction member 61 is moved to the position, the heat conduction member 61 transmits the light from the light source 10. It absorbs and generates heat, and this heat is transmitted to the liquid crystal light valve 37 in the vicinity. Therefore, heat is transferred from the heat conducting member 61 to the light irradiation region 37 by moving the heat conducting member 61 to the above position when the alignment state of the liquid crystal molecules is changed from the splay alignment to the bend alignment as described above. And the temperature of the liquid crystal layer during the bend transition can be increased. Thereby, the time required for bend transition can be shortened. In addition, since there is no need to mount a large heating mechanism as in the prior art, cost reduction and space saving can be achieved.

  Further, since the upper and lower heat conducting members 61 have the shielding portions 61b, 61c, 61d, the boundary portion 61a of the heat conducting member 61 is covered with the shielding portion 61b, and the heat conducting member 61 and the frame 60 are covered. Is covered with the shielding portions 61c and 61d. For this reason, it can prevent that light leaks from the clearance gap between the boundary part 61a of the heat conductive member 61 and the flame | frame 60, and can increase the light quantity of the light to absorb. Thereby, the amount of heat generated by the heat conducting member 61 can be increased, and a large amount of heat can be transmitted to the light modulation element.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the surface 61f of the heat conducting member 61 that is in close contact with the light irradiation region 37a has been described as a flat surface, but the present invention is not limited to this. For example, as shown in FIG. 8, a convex portion 61g may be formed in a portion in contact with the light irradiation region 37a. Thereby, the heat generated by the heat conducting member 61 can be directly conducted to the light irradiation region 37a through the contact portion. In addition, it is possible to suppress damage to the light irradiation region 37a as much as possible by bringing only the convex portion 61g into contact with each other instead of bringing the entire surface of the heat conducting member 61 into close contact.

  In the above embodiment, the heat conducting member 61 is held at a position away from the liquid crystal light valve 37 as shown in FIG. 6 at times other than during the bend transition. However, the present invention is not limited to this. For example, as shown in FIG. 9, the heat conducting member 61 may be held so as to contact the frame 60 of the liquid crystal light valve 37. In such a configuration, the heat conducting member 61 can be cooled by using the frame 60 as a heat radiating fin when the bend is not moved. Thereby, it is possible to prevent the temperature of the projector 1 from becoming too high during driving. For example, as shown in FIG. 10, the heat conducting member 61 may be arranged to be inclined with respect to the liquid crystal light valve 37 so that the air flowing through the projector 1 flows toward the liquid crystal light valve 37. Thereby, the liquid crystal light valve 37 can be cooled when the liquid crystal light valve 37 is driven, and the temperature of the projector 1 can be prevented from becoming too high.

  In the above embodiment, when the power of the projector 1 is turned off, the startup of the projector 1 is finished with the heat conducting member 61 being opened as shown in FIG. For example, as shown in FIG. 7, the activation of the projector 1 may be terminated while the heat conducting member 61 is in close contact with the light irradiation region 37a. In this way, it is possible to prevent dust and dirt from adhering to the light irradiation region 37a.

  Moreover, in the said embodiment, although it was set as the structure which provided the heat conduction member 61 one by one up and down, a total of two, it is not restricted to this, As a structure which provides one or three or more heat conduction members 61 It doesn't matter. Moreover, in the said embodiment, although it was set as the structure which controls the operation | movement of the heat conductive member 61 by the shutter control driver 63, it is not restricted to this, For example, the structure which moves a heat conductive member manually may be sufficient. .

1 is a diagram showing an overall configuration of a projector according to an embodiment of the invention. FIG. 3 is a cross-sectional view showing a configuration of a liquid crystal device mounted on the projector according to the embodiment. FIG. 3 is a perspective view illustrating a configuration of a part of the projector according to the embodiment. FIG. 2 is a block diagram illustrating a configuration of a control system of the projector according to the present embodiment. 6 is a flowchart showing the operation of the projector according to the embodiment. FIG. 6 is a diagram illustrating an operation of a projector according to an embodiment (part 1). FIG. 7 is a diagram illustrating an operation of a projector according to the present embodiment (part 2). FIG. 10 is a diagram showing another configuration of the projector according to the invention. FIG. 10 is a diagram showing another configuration of the projector according to the invention. FIG. 10 is a diagram showing another configuration of the projector according to the invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector 2 ... Image display apparatus 5 ... Start-up control part 10 ... Light source 36 ... Shutter part 37 ... Liquid crystal light valve 37a ... Light irradiation area | region 37b ... Peripheral area | region 40 ... Light valve driver 51 ... Liquid crystal molecule 60 ... Frame 61 ... Heat conduction Member 61b, 61c, 61d ... shielding part 61g ... convex part 62 ... guide mechanism 63 ... shutter control driver 64 ... connection part 65 ... support post 66 ... guide rail 70 ... position

Claims (9)

A light source, a light modulation element that has a light irradiation region to which light from the light source is irradiated, modulates the light irradiated to the light irradiation region, and a projection lens that projects light modulated by the light modulation element; A projector comprising:
The light modulation element has a pair of substrates arranged opposite to each other and a liquid crystal layer sandwiched between the pair of substrates, and changes the alignment state of the liquid crystal molecules of the liquid crystal layer from the splay alignment to the bend alignment. A liquid crystal device that performs light modulation;
A projector comprising: a heat conduction member that can block the light irradiated to the light irradiation region and is movable to a position close to the light irradiation region. The projector according to claim 1, wherein the heat conducting member is movably provided at a position in contact with the light modulation element. The projector according to claim 2, wherein the heat conducting member has a convex portion at a portion in contact with the light modulation element. A plurality of the heat conducting members are provided,
4. The projector according to claim 1, wherein each of the plurality of heat conducting members is movably provided at a different position. 5. The projector according to claim 4, wherein each of the plurality of heat conducting members is provided so as to be movable from different directions with respect to the light modulation element. 6. The projector according to claim 4, wherein a first shielding portion is provided on at least a part of one of the plurality of heat conducting members. 7. . The projector according to any one of claims 1 to 6, wherein the heat conducting member includes a second shielding portion capable of shielding a peripheral edge portion of the light irradiation region.   It further comprises movement control means for controlling movement of the heat conduction member so that the heat conduction member moves to the position at the time of bend transition in which the alignment state of the liquid crystal molecules is changed from splay alignment to bend alignment. The projector according to any one of claims 1 to 7, wherein the projector is characterized in that: At least a portion of the light modulation element is covered by a frame;
The projector according to claim 8, wherein the heat conducting member is in contact with the frame when the bend transition is not performed.

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