JP6311808B2 - Liquid crystal display unit and projection display device - Google Patents

Liquid crystal display unit and projection display device Download PDF

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JP6311808B2
JP6311808B2 JP2017030690A JP2017030690A JP6311808B2 JP 6311808 B2 JP6311808 B2 JP 6311808B2 JP 2017030690 A JP2017030690 A JP 2017030690A JP 2017030690 A JP2017030690 A JP 2017030690A JP 6311808 B2 JP6311808 B2 JP 6311808B2
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liquid crystal
crystal display
display unit
thickness
holder
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JP2017102478A (en
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禎久 愛甲
禎久 愛甲
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ソニー株式会社
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Description

  The present technology relates to a liquid crystal display unit capable of modulating light and a projection display device.

  Conventionally, projection display devices such as projectors have been widely used. For example, light from a light source is modulated by a light modulation element such as a liquid crystal element, and the modulated light is projected onto a screen or the like to display an image. As the light modulation element, a reflective liquid crystal display element, a transmissive liquid crystal element, or the like is used.

  Patent Document 1 describes a liquid crystal display unit including a liquid crystal panel, a light shielding plate, an optical compensation element, and an optical compensation element holder. In this liquid crystal display unit, the optical compensation element is held so that it does not come into contact with other members and is spaced from the light shielding plate. This prevents heat and force from being transmitted to the optical compensation element from the outside, and prevents uneven brightness from occurring on the projection screen.

  Patent Document 2 describes a projection apparatus that includes a reflection panel unit having a reflection type light modulation element and a prism unit that synthesizes and outputs light modulated by the light modulation element. In this projection apparatus, fixing members are attached to the reflection panel unit and the prism unit, respectively. Then, the reflective panel unit and the prism unit are bonded via the fixing members attached to both. Thereby, the registration of the projection apparatus can be adjusted with high accuracy.

JP 2013-54145 A JP 2013-54143 A

  Thus, there is a need for a projection display device that can prevent image quality degradation and registration shift due to external force and heat.

  In view of the circumstances as described above, an object of the present technology is to provide a liquid crystal display unit and a projection display device capable of preventing the influence of external force and heat.

In order to achieve the above object, a liquid crystal display unit according to an embodiment of the present technology includes a liquid crystal display element and a holder portion.
The liquid crystal display element modulates light.
The holder part includes a holding part, a connecting part, an attenuation part, and a plurality of through holes.
The holding unit holds the liquid crystal display element.
The connecting portion is formed integrally with the holding portion and is connected to a fixing member that fixes the position of the liquid crystal display element.
The attenuation part is formed in a region from the connection part to the holding part, and attenuates a force transmitted from the connection part to the holding part.
The plurality of through holes are formed in the connecting portion, include a notch through hole that is partially opened, and a connecting member for connecting to the fixing member is inserted.

  In this liquid crystal display unit, the liquid crystal display element is held by the holding portion of the holder portion. The holder part is connected to the fixing member at the connecting part. Since the attenuation portion is formed in the region from the connecting portion to the holding portion, it is possible to suppress the stress generated in the connecting portion due to an external force or the like from being transmitted to the holding portion. Moreover, since the notch through-hole by which one part was open | released is formed as a through-hole into which a connection member is inserted, the influence of the expansion | swelling etc. of the holder part by heat can be suppressed. Thereby, it becomes possible to prevent the influence by external force and a heat | fever.

The holding portion may have a first thickness. In this case, the attenuation portion may be formed with a second thickness smaller than the first thickness.
In this liquid crystal display unit, the attenuation portion is formed with a second thickness smaller than the first thickness of the holding portion. By forming a portion having a small thickness as the attenuation portion, the force to the holding portion is attenuated.

The connecting portion may be formed as the attenuation portion with the second thickness.
Thus, the connection part connected to the holding part may be formed as an attenuation part. As a result, the force transmitted to the holding portion can be sufficiently attenuated.

The second thickness may be at least ½ or less of the first thickness.
Thus, the force to the holding part can be sufficiently attenuated by setting the second thickness to be at least ½ or less of the first thickness.

The holder portion has a substantially rectangular shape and may have two long side portions facing each other. In this case, the holding portion may be formed in a central region of each of the two long side portions. Moreover, the said connection part may be formed as four connection parts in each both ends of the said 2 long side part. Further, the attenuation portion may be formed with the second thickness in a region of the two long side portions from the connecting portion to the holding portion.
In this way, the liquid crystal display element may be held by the two long side portions in which the attenuation portions are formed. The damping part prevents the holding part from being deformed by an external force, or from being displaced due to thermal expansion or the like. As a result, it is possible to prevent deterioration of the projected image and registration deviation.

The said notch through-hole may be open | released toward the outer edge of the said long side part.
Thereby, it becomes possible to absorb the expansion | swelling etc. to the extension direction of a long side part fully.

The notch through-hole may be formed in each of two connecting portions formed at the same end of the two long side portions of the four connecting portions.
Thus, a notch through-hole may be formed at the end on the same side of the two long sides.

The notch through hole may be formed in each of two connecting portions formed at both ends of the long side portion of the four connecting portions.
Thus, a notch through-hole may be formed at both ends of one long side portion. This makes it possible to sufficiently absorb thermal expansion and the like.

The two long side portions may extend in the same direction as a connection direction of a flexible circuit board connected to the liquid crystal display element.
In this way, two long sides that hold the liquid crystal display element may be formed so as to extend in the connecting direction of the flexible cable.

The holder part may be substantially rectangular. In this case, the holding part may be formed in a central region of the holder part. Moreover, the said connection part may be formed as four connection parts in the four corners of the said holder part.
Thus, the holding part may be formed in the central region of the holder part, and the holder part may be connected to the fixing member by the four connecting parts formed at the four corners. Even in this case, the attenuation part is formed in the region from the connection part to the holding part, or the connection part is formed as the attenuation part, thereby making it possible to prevent the influence of external force or heat.

  The liquid crystal display element may be a reflective liquid crystal display element.

  A projection display device according to an embodiment of the present technology includes a light source that emits light and the liquid crystal display unit. The liquid crystal display unit modulates light from the light source.

  As described above, according to the present technology, it is possible to prevent the influence of external force and heat.

It is a figure showing a schematic structure of a projection type display concerning a 1st embodiment of this art. It is a perspective view which shows schematic structure of the liquid crystal display unit which concerns on 1st Embodiment. It is the top view, side view, and bottom view which show schematic structure of a liquid crystal display unit. It is a figure which shows the modification of the liquid crystal display unit which concerns on 1st Embodiment. It is a figure which shows the modification of the liquid crystal display unit which concerns on 1st Embodiment. It is a figure which shows the modification of the liquid crystal display unit which concerns on 1st Embodiment. It is a figure which shows the modification of the liquid crystal display unit which concerns on 1st Embodiment. It is a figure which shows the modification regarding the position and shape of a notch through-hole. It is a figure which shows the modification regarding the position and shape of a notch through-hole. It is a figure which shows the modification regarding the position and shape of a notch through-hole. It is a figure which shows the modification regarding the position and shape of a notch through-hole. It is a perspective view showing a liquid crystal display unit concerning a 2nd embodiment of this art. It is a figure which shows the back side of the liquid crystal display unit which concerns on 2nd Embodiment. It is a figure of the state which decomposed | disassembled the fixing member and the holder part. It is a figure which expands and shows the holder part which concerns on 2nd Embodiment. It is sectional drawing of the AA line shown in FIG. It is a side view which shows the modification of the liquid crystal display unit which concerns on 2nd Embodiment.

  Hereinafter, embodiments according to the present technology will be described with reference to the drawings.

<First Embodiment>
[Projection type display device]
FIG. 1 is a diagram illustrating a schematic configuration of a projection display device according to the first embodiment of the present technology. The projection display device 1 modulates light for each of red light, green light, and blue light (RGB color lights), and synthesizes the modulated light (image) for each color to project and display a color image. To do. The projection display device 1 is used as a projector for digital cinema, for example. The present technology can also be applied to display devices used for other purposes.

  As shown in FIG. 1, the projection display device 1 includes an illumination optical system 10 that emits light L, a spectroscopic optical system 20 that splits the light L emitted from the illumination optical system 10, and 3 that modulates the light L. And two liquid crystal display units 30 (30R, 30G, 30B). The projection display device 1 includes a light combining unit 80 that combines the light L modulated by the three liquid crystal display units 30R, 30G, and 30B, and a projection lens system 81 that projects the light L combined by the light combining unit 80. Have. Further, reflective polarizing elements 82R, 82G, and 82B are provided between the spectroscopic optical system 20 and the three liquid crystal display devices 30R, 30G, and 30B, respectively.

  The illumination optical system 10 includes a light source 11, a concave lens 12 that adjusts the light L emitted from the light source 11 to substantially parallel light, a UV cut filter 13, a first fly-eye lens 14, and a second fly-eye lens. 15 and a condenser lens 16.

  As the light source 11, for example, a xenon lamp, a halogen lamp, an ultrahigh pressure mercury lamp, or the like is used. A reflector 17 that reflects the light L emitted from the light source 11 is provided around the light source 11. The light L reflected by the reflector 17 is emitted to the concave lens 12. The light transmitted through the concave lens 12 is emitted to the UV cut filter 13, and ultraviolet rays are removed by the UV cut filter 13. Note that a laser light source capable of emitting laser light may be used as the light source.

  The light L that has passed through the UV cut filter 13 enters the first and second fly-eye lenses 14 and 15. By transmitting the light L through the first and second fly's eye lenses 14 and 15, the luminance unevenness of the light L is reduced. The light L transmitted through the first and second fly-eye lenses 14 and 15 enters the condenser lens 16. The light incident on the condenser lens 16 is condensed and emitted to the spectroscopic optical system 20.

  The spectroscopic optical system 20 includes a first dichroic mirror 21, two reflection mirrors 22 and 23, two condenser lenses 24 and 25, and a second dichroic mirror 26. The first dichroic mirror 21 splits the light L emitted from the illumination optical system 10 into blue light LB on the short wavelength side, red light LR and green light LG on the long wavelength side. The blue light LB dispersed by the first dichroic mirror 21 is reflected by the first reflecting mirror 22 and enters the first condenser lens 24. Then, the blue light LB collected by the first condenser lens 24 is incident on the liquid crystal display unit 30B via the reflective polarizing element 82B. As the reflective polarizing element 82B, a prism type beam splitter, a wire grid polarizer or the like is used.

  The red light LR and the green light LG dispersed by the first dichroic mirror 21 are reflected by the second reflecting mirror 23 and enter the second condenser lens 25. Then, the red light LR and the green light LG collected by the second condenser lens 25 are emitted to the second dichroic mirror 26. The second dichroic mirror 26 splits the red light LR and the green light LG into the short wavelength side green light LG and the long wavelength side red light LR. The split red light LR is incident on the liquid crystal display unit 30R via the reflective polarizing element 82R. The green light LG enters the liquid crystal display unit 30G via the reflective polarizing element 82G.

  The light beams LR, LG, and LB incident on the liquid crystal display units 30R, 30G, and 30B are intensified according to the image information by the reflective liquid crystal panels 31 provided in the liquid crystal display units 30R, 30G, and 30B, respectively. The image light having a distribution is modulated and reflected. The three modulated image lights are reflected by the reflective polarizing elements 82R, 82G, and 82B and enter the light combining unit 80. At this time, the polarization direction of the modulated light of each color is made uniform by the polarizing plate 83 provided in the light combining unit 80. This improves the contrast.

  In the present embodiment, the liquid crystal panel 31 corresponds to a liquid crystal display element that modulates light from a light source. The detailed configuration of the liquid crystal display units 30R, 30G, and 30B will be described later.

  The light combining unit 80 is configured by, for example, a dichroic prism. The light combining unit 80 combines the three lights modulated by the liquid crystal display units 30R, 30G, and 30B on the same optical path, and outputs the combined light to the projection lens system 81. The synthesized light is enlarged to a predetermined magnification by the projection lens system 81 and projected onto a screen (not shown). As a result, a color image is displayed.

  The reflective polarizing elements 82R, 82G, and 82B, the polarizing plate 83, and the light combining unit 80 are held by a holding member (not shown). Then, the liquid crystal display units 30R, 30G, and 30B are fixed to predetermined positions of the holding member, respectively.

[LCD unit]
2 and 3 are perspective views showing a schematic configuration of the liquid crystal display unit 30 according to the present embodiment. 3A is a top view of the liquid crystal display unit 30 as viewed from above, and FIG. 3B is a side view of the liquid crystal display unit 30 as viewed from the side. FIG. 3C is a bottom view of the liquid crystal display unit 30 as viewed from below.

  The liquid crystal display unit 30 includes a liquid crystal panel 31 and a holder portion 32 that holds the liquid crystal panel 31. A flexible circuit board 33 is connected to the liquid crystal panel 31, and an image signal is output to the liquid crystal panel 31 via the flexible circuit board 33. Further, the liquid crystal display unit 30 has a cooling structure member such as a heat sink (not shown) on the back side of the holder portion 31.

  The holder part 32 is connected to a fixing member 34 for fixing the position of the liquid crystal panel 31 in the projection display device 1. The fixing member 34 is fixed to a holding member that holds the reflective polarizing elements 82R, 82G, 82B, etc., with an adhesive or the like. By connecting the holder portion 32 to the fixing member 34, the three liquid crystal panels 31 that modulate light of each color are fixed at appropriate positions, and registration (superimposition of images of RGB colors) is adjusted.

  The fixing member 34 is formed by bending a pair of opposite end portions 35 of a substantially rectangular sheet metal facing each other. A central region sandwiched between both end portions 35 is a main surface portion 36, and a bent portion of both end portions 35 is a side surface portion 37. The main surface portion 36 is formed with a size approximately equal to the size of the main surface portion 38 of the holder portion 31 on which the liquid crystal panel 31 is placed. An opening 39 corresponding to the size of the liquid crystal panel 31 is formed in the central region of the main surface portion 36 of the fixing member 34. Light L from the light source 11 enters the liquid crystal panel 31 through the opening 39, and light L modulated by the liquid crystal panel 31 is emitted.

  Screw holes 41 penetrating the main surface portion 36 are formed at four corners of the main surface portion 36 of the fixing member 34. The screw holes 41 are located outside the four corners of the opening 39. As shown in FIG. 2, the screw 42 is inserted into the screw hole 41 from the back side of the holder part 32 through the plurality of through holes 45 of the holder part 32. As a result, the holder portion 32 is coupled to the fixing member 34. The configuration of the fixing member 34 is not limited to that shown in FIG. 2 and may be appropriately designed. The four screws 42 correspond to connecting members in the present embodiment.

  As shown in FIGS. 2 and 3, the holder portion 32 includes a holding portion 46 that holds the liquid crystal panel 31, a connecting portion 47 that is connected to the fixing member, and a plurality of through holes 45 that are formed in the connecting portion 47. Have The holder portion 32 has an attenuation portion 48 that attenuates the force transmitted from the connecting portion 47 to the holding portion 46. As will be described below, in the present embodiment, the connecting portion 47 is formed as an attenuation portion 48.

  The holder portion 32 has a substantially rectangular shape when viewed from above, and the same direction as the connection direction of the flexible circuit board 33 is the long side direction, and the direction orthogonal to the direction is the short side direction. The liquid crystal panel 31 is held in the central region of the main surface portion 38 of the holder portion 32. That is, the holding portion 46 is formed in the central region of the holder portion 32.

  The connecting portion 47 is formed integrally with the holding portion 46. In the present embodiment, four connecting portions 47 are formed at the four corners of the holder portion 32. As shown in FIG. 3B, when the thickness of the holding portion 46 is compared with the thickness of the connecting portion 47, the thickness of the connecting portion 47 is smaller. That is, when the thickness of the holding portion 36 is the first thickness t1, the connecting portion 47 is formed with a second thickness t2 that is smaller than the first thickness t1. As a result, the connecting portion 47 also functions as the attenuating portion 48. For example, even when an external force or the like is applied and a stress is generated in the connecting portion 47, the connecting portion 47 having a small thickness is allowed to be deformed and force is applied. Can be absorbed. As a result, the force transmitted to the holding part 46 can be attenuated.

  Even when thermal expansion occurs in the holder part 32, the expansion stress can be absorbed by the connecting part 47 (attenuating part 48) having a small thickness, and the stress of the entire holder part 32 can be released. As a result, it is possible to prevent the liquid crystal panel 31 from being distorted, and it is possible to prevent the projected image from being deteriorated, registration deviation, and the like.

  Thus, in the present embodiment, a portion having a smaller thickness than the holding portion 46 is formed as the attenuation portion 48. Then, the force is absorbed by the attenuating unit 48 to attenuate the transmission of the force to the holding unit 46. In the present embodiment, the connecting portion 47 connected to the fixing member 34 is formed as the attenuation portion 48 with the second thickness t2. As a result, the force can be absorbed by the connecting portion 47, and the force itself generated by the connecting portion 47 can be reduced. As a result, the force transmitted to the holding part 46 can be made sufficiently small.

  Although how much the 2nd thickness t2 is made small with respect to the 1st thickness t1 is not limited, By making the 2nd thickness t2 into 1/2 or less of the 1st thickness t1, at least of the 1st thickness t1, the holding | maintenance part 46 of It was possible to sufficiently suppress the occurrence of distortion and the like. Further, when the second thickness t2 was set to 1/3 or less of the first thickness t1 and 1/4 or less, a sufficient effect was obtained. The second thickness t2 may be appropriately set based on the size, material, and the like of the holder portion 32. When a plurality of attenuation portions 48 are formed, the thickness of each attenuation portion 48 may be different from each other. In the range smaller than the first thickness t1, the thickness of each attenuation portion 48 may be set as appropriate.

  3A and 3C, among the plurality of through holes 45 into which the screws 42 for connection to the fixing member 34 are inserted, at least one through hole is a notch through which a part is opened. It is formed as a hole 49. In this embodiment, the notch through-hole 49 is formed in the two connection parts 47 located in the both ends of the short side 50a by the side to which the flexible circuit board 33 is connected. And two through-holes 52 whose entire circumference is closed are formed in the connecting portions 47 located at both ends of the other short side 50b. The two notch through holes 49 are open toward the outer edges of the two long sides 53. That is, a part of the outer edge of the long side 53 becomes the open end 54 of the notch through hole 49 and is a discontinuous portion.

  Thus, in this embodiment, a part of the through hole 45 into which the screw 42 is inserted is formed as the notched through hole 49. Thus, even when thermal expansion occurs, the screw 45 can slide in the direction of the open end 54 of the notch through-hole 49, so that stress due to heat is released and transmission of stress to the liquid crystal panel 31 can be blocked. Further, even in the discontinuous portion that is the open end 54, the deformation of the holder portion 32 can be absorbed. Moreover, since the through-hole 52 whose entire circumference is closed is formed as the through-hole 45, displacement of the entire holder portion 32 can be prevented with reference to that portion. As a result, registration deviation can be prevented.

  The formation method of the holder part 32 is not limited, Arbitrary methods, such as press work and cutting, may be used.

  As the fixing member 34, in order to sufficiently hold the position of the liquid crystal panel 31, a low linear expansion material that is less affected by heat is often used. On the other hand, as the holder portion 32, a material having high thermal conductivity such as aluminum or copper is used so as to be advantageous for the transfer of heat to the cooling structure member. These materials have a relatively high linear expansion coefficient. Due to the difference in linear expansion coefficient between the fixing member 34 and the holder portion 32 that are connected to each other, it is conceivable that stress is applied to the holding portion 46 and the liquid crystal panel 31 is distorted or displaced. In the present embodiment, by providing the attenuation portion 48 and the notch through hole 49, it is possible to prevent the influence of stress due to the difference in linear expansion coefficient.

  In addition, as a situation where stress due to heat occurs, there are both a cause caused by heat generation during operation of the projection display device 1 and a cause caused by environmental change (temperature change) during non-operation. Conceivable. The generation of heat during operation includes, for example, the case where heat generated from the liquid crystal panel 31 receiving light is transmitted to the holder part 32, or the case where the holder part 32 itself receives light to generate heat. On the other hand, the change in the environment during non-operation may be, for example, a change in temperature due to a change in season, a change in temperature between morning and night in a day, a change in temperature due to movement from the room to the outdoors, and the like. In any case, by using this technology, it is possible to prevent stress from being transmitted from the holder portion 32 to the effective pixel portion of the liquid crystal panel 31 to cause polarization disturbance or the like to deteriorate the image quality. . In addition, it is possible to prevent the occurrence of a registration shift due to a slight positional shift caused by deformation caused by stress.

[Modified example of liquid crystal display unit]
4-7 is a figure which shows the modification of the liquid crystal display unit 30 which concerns on this embodiment. A of each figure is a top view and B is a side view. In the liquid crystal display unit 110 shown in FIG. 4, an attenuation portion 112 is formed over the entire circumference of the holding portion 111 that holds the liquid crystal panel 31. That is, cutting is performed over the entire circumference of the holding portion 111, and the attenuation portion 112 having the second thickness t2 is formed. A plurality of through-holes 114 including notch through-holes 113 are formed at the four corners of the attenuation portion 112 formed around the holding portion 111. Therefore, in this example, the connecting portion 115 is formed as the attenuation portion 112. In addition, the attenuation portion 112 is also formed in a region other than the connection portion 115 in the region from the connection portion 115 to the holding portion 111. Even in such a configuration, it is possible to prevent transmission of stress to the liquid crystal panel 31 and to prevent the entire holder unit 116 from being displaced.

  In addition, the area | region from a connection part to a holding | maintenance part can also be said to be a part continuing to both a connection part and a holding | maintenance part. In this description, the region that can absorb the force transmitted to the holding portion by allowing deformation is collectively referred to as a region from the connecting portion to the holding portion. Moreover, the area | region from a connection part to a holding | maintenance part is an area | region also including the area | region in which the connection part is formed. It is sufficient that an attenuation portion is formed in this region.

  In the liquid crystal display unit 120 shown in FIG. 5, the two long sides 127 of the holder portion 126 are formed as the attenuation portion 122 with a second thickness t2. A plurality of through holes 124 including notch through holes 123 are formed in the attenuation portion 122. Also in this example, the attenuation part 122 is formed in the area other than the connection part 125 in the connection part 125 and the area from the connection part 125 to the holding part 121. Even in such a configuration, the same effect is exhibited.

  In the liquid crystal display unit 130 shown in FIG. 6, the attenuation unit 132 is formed at the two short sides 138 of the holder unit 136. Even with such a configuration, the same effect is exhibited.

  The liquid crystal display unit 140 shown in FIG. 7 is an area surrounding the entire periphery of the holding part 141 that holds the liquid crystal panel 31, and an attenuation part 142 is formed in an area other than the connecting part 145. That is, in this example, the attenuation portion 142 is formed in a region other than the connection portion 145 in the region from the connection portion 145 to the holding portion 141. Even in such a configuration, it is possible to prevent the transmission of stress to the liquid crystal panel 31 and the displacement of the entire holder portion 146.

  FIGS. 8-11 is a figure which shows the modification regarding the position and shape of a notch through-hole. For example, as shown in FIG. 8, notched through holes 151 may be formed at both ends of the short side 150 so as to open toward the outer edge of the short side 150. In this case, a part of the outer edge of the short side 150 becomes the open end 152 of the notch through hole 151 and becomes a discontinuous portion.

  Further, as shown in FIGS. 9 and 10, notched through holes 156 may be formed at both ends of one of the two long sides 155. In this case, the two notch through holes 156 may be opened toward the outer edge of the long side 155a (FIG. 9), or may be opened toward the outer edge of the short side 157 sandwiching the long side 155a. (FIG. 10). The shape seen from the penetration direction of the notch through hole is not limited. For example, a so-called U-shape in which a part of a circular shape is opened, such as a notch through hole 49 shown in FIG. 3, or a rectangular shape like a notch through hole 158 shown in FIG. Also good. The shape of the notch through hole may be appropriately designed as long as the escape of sliding of the screw can be secured and the head of the screw can hold the holder portion.

  As described above, in the liquid crystal display unit 30 according to the present embodiment, the liquid crystal panel 31 is held by the holding portion 46 of the holder portion 32. The holder part 32 is connected to the fixing member 34 by a connecting part 47. Since the attenuation portion 48 is formed in the region from the connecting portion 47 to the holding portion 46 with a second thickness t2 smaller than the first thickness t1, the stress generated in the connecting portion 47 due to an external force or the like is held by the holding portion. 46 can be suppressed. Moreover, since the notch through-hole 49 by which one part was open | released is formed as the through-hole 45 in which the screw | thread 42 is inserted, the influence of expansion etc. of the holder part 32 by a heat | fever can be suppressed. Thereby, it becomes possible to prevent the influence of external force and heat.

  In recent years, higher brightness, higher contrast, and higher definition of projection display devices have been advanced, and the quality of displayed images has been improved. Along with this, precise position adjustment of each liquid crystal panel is performed so that the images of each color of RGB are accurately overlapped without being shifted on the screen. On the other hand, as the amount of light incident on the liquid crystal panel increases as the brightness increases, deformation of the liquid crystal panel due to heat becomes a major problem. That is, the deformation of the liquid crystal panel causes stress in the liquid crystal, and coupled with the increase in contrast, the polarization disturbance due to the stress is easily noticeable in displaying a black image. For this reason, there is a problem that image quality deteriorates due to color unevenness and brightness unevenness on a screen where black is originally desirable.

  Further, as the definition becomes higher, the size per pixel of the liquid crystal panel tends to be smaller, and the allowable displacement of the liquid crystal panel is also becoming smaller. However, the heat generation accompanying the increase in the amount of incident light causes a positional shift due to thermal deformation in the liquid crystal panel, which is one of the causes of registration failure of each color image in the projected image, that is, a registration shift.

  In the present embodiment, by forming the attenuation portion 48 with a small thickness and the cutout through hole 49 that is partially opened, the stress is accepted positively, and the stress in the liquid crystal and the positional deviation of the liquid crystal panel 31 are reduced. It became possible to avoid it. That is, by reducing the thickness and reducing the thickness, the amount of strain increases, but the cross-sectional secondary moment decreases, and the stress generated in the damping portion 48 decreases. The holding portion 46 that holds the liquid crystal panel 31 is formed with a thick structure having a large thickness in order to give rigidity, so that stress is transmitted at the boundary between the thin portion (attenuating portion) and the thick portion (holding portion). As a result, the stress transmission to the effective pixel portion of the liquid crystal panel 31 can be sufficiently reduced. Further, the direction of stress relief is provided by the notch through hole 49, thereby suppressing the transmission of stress to the effective pixel portion. Further, positive deformation is promoted by the open end 54, it is possible to eliminate stress accumulation due to the difference in linear expansion coefficient, and it is possible to prevent registration deviation. As a result, even if brightness, contrast, and definition are advanced, it is possible to suppress deterioration in image quality caused by color unevenness, brightness unevenness, and poor overlay of each color image, and provide a higher quality image. Became possible.

<Second Embodiment>
A liquid crystal display unit according to a second embodiment of the present technology will be described. In the following description, the description of the same parts as those of the liquid crystal display unit described in the above embodiment will be omitted or simplified.

  FIG. 12 is a perspective view showing the liquid crystal display unit 230 according to the present embodiment. FIG. 13 is a view showing the back side of the liquid crystal display unit 230.

  The basic configuration of the liquid crystal display unit 230 according to the present embodiment is the same as that described in the first embodiment. That is, the liquid crystal display unit 230 includes a liquid crystal panel 231 and a holder portion 232 that holds the liquid crystal panel 231. A flexible circuit board 233 is connected to the liquid crystal panel 231. The holder part 232 is connected to the fixing member 234. As shown in FIG. 13, a heat sink 240 for cooling the liquid crystal panel 231 and the holder part 232 is disposed on the back side of the holder part 232.

  An opening 239 is formed in the main surface portion 236 of the fixing member 234, and light is incident and emitted through the opening 239. Screw holes 241 are formed at the four corners of the main surface portion 236, and screws inserted from the back side of the holder portion 232 are inserted into the screw holes 241. As a result, the holder portion 232 is coupled to the fixing member 234.

  Various optical members are placed on the main surface portion 238 of the holder portion 232 and in an area in the opening 239 of the fixing member 234, and the liquid crystal display unit 230 is configured as one package together with them. Also good. For example, the panel cover, the light shielding plate, the pre-light shielding plate holder, the optical compensation element holder, the optical compensation element, the packing, and the pre-light shielding plate may be placed in this order on the main surface portion 238 of the holder portion 232. Such a configuration is described in, for example, Patent Document 1 described above, and the contents thereof are included in the disclosure scope of the present application.

  FIG. 14 is a diagram showing a state in which the fixing member 234 and the holder portion 232 are disassembled. FIG. 15 is an enlarged view showing the holder portion 232. 16 is a cross-sectional view taken along line AA shown in FIG.

  The holder part 232 according to the present embodiment has a substantially rectangular shape when viewed from above, and has two long side parts 261 facing each other. The long side portion 261 is a region along the long side of the holder portion 232. A holding portion 246 that holds the liquid crystal panel 231 is formed in the central region of each of the two long side portions 261.

  As shown in FIG. 16, the long side portion 261 includes a support portion 262 having the largest thickness as an outer edge and a placement portion 263 formed from the support portion 262 toward the inside. A mounting surface 264 is formed in a step shape on the mounting portion 263, and the liquid crystal panel 231 is mounted on the mounting surface 264. The entire central region of the long side portion 261 including the placement surface 231 and the placement portion 263 functions as the holding portion 246. The rigidity of the holding portion 246 is mainly determined by the support portion 262 having the largest thickness. Therefore, in the present embodiment, the first thickness t1 of the holding portion 246 is considered based on the thickness of the support portion 262. That is, as the first thickness t1 of the holding portion, the thickness of the portion that contributes to the rigidity of the holding portion may be typically selected.

  The flexible circuit board 233 is inserted from the short side 260 side of the holder part 232 and connected to the liquid crystal panel 231. That is, in this embodiment, the long side portion 261 is formed so as to extend in the same direction as the connection direction of the flexible circuit board 233 connected to the liquid crystal panel 231. The liquid crystal panel 231 is held by the long side portion 261. In other words, the liquid crystal panel 231 is held by the long side portion 261, and a region between the long side portions 261 is used for connection between the flexible circuit board 233 and the liquid crystal panel 231. As a result, the liquid crystal display unit 230 can be reduced in size. Note that the liquid crystal panel 231 may be held by two short side portions that are regions along the short side 260, and the flexible circuit board 233 may be connected to the liquid crystal panel 231 along the short side direction.

  As shown in FIG. 15 and the like, the connecting portion 247 is formed as four connecting portions 247 at both ends of the two long side portions 261. The connecting portion 247 is formed as the attenuation portion 248 with a second thickness t2 that is smaller than the first thickness t1. That is, the connecting portion 247 is formed with a thickness smaller than the thickness of the support portion 251. The second thickness t2 may be larger than the thickness of the mounting portion 263 included in the holding portion 246 as long as it is in a range smaller than the first thickness t1. The connecting portion 247 (attenuating portion 248) may be formed with a thickness smaller than the thickness of the supporting portion 262 so that the force transmitted to the supporting portion 262 can be attenuated.

  The four connecting portions 247 are each formed with a through hole 245 into which a screw is inserted. In this embodiment, the notch through-holes 249 are respectively formed in the two connecting portions 247 formed at the end portions on the same side of the two long side portions 261. Specifically, two notched through holes 249 are formed on the side where the flexible circuit board 233 is inserted. Each of the two notch through holes 249 is opened toward the outer edge of the long side portion 261. Two through holes 252 whose entire circumference is closed are formed on the other end side of the long side portion 261. With such a configuration, it is possible to sufficiently absorb mainly the expansion of the long side portion 261 in the extending direction.

  As shown in FIGS. 8 to 11, two notched through holes 249 are formed in two connecting portions 247 formed at both ends of one long side portion 261 of the four connecting portions 247. May be. Further, the direction in which the cutout through hole 249 is opened, that is, the position of the open end, the shape of the cutout through hole 249, and the like may be appropriately designed.

  FIG. 17 is a side view showing a modification of the liquid crystal display unit 230 according to the present embodiment. As shown in FIG. 17, in the liquid crystal display unit 330, the attenuation portion 348 having the second thickness t <b> 2 smaller than the first thickness t <b> 1 extends from the connecting portion 347 to the holding portion 346 of the two long side portions 361. Formed in the region. Even in such a configuration, the force transmitted to the holding portion 346 can be attenuated.

  As described above, in the liquid crystal display unit 230 according to the present embodiment, the liquid crystal panel 231 is held by the two long side portions 261 in which the attenuation portion 248 is formed. The connecting portion 247 is formed with a notch through hole 249. Even in such a configuration, it is possible to obtain the same effect as the above-described embodiment, and it is possible to sufficiently prevent the influence of external force and heat.

<Other embodiments>
The present technology is not limited to the embodiments described above, and other various embodiments can be realized.

  In the above, a liquid crystal display unit having a reflective liquid crystal panel is used. However, the present technology can also be applied to a liquid crystal display unit having a transmissive liquid crystal panel. That is, the holder part is configured not to block incident light and outgoing light (transmitted light), and an attenuation part and a notch through hole may be formed in the holder part. Thereby, it becomes possible to prevent the influence by external force and a heat | fever.

  In the above, four through holes are formed at the four corners of the substantially rectangular holder portion, and two of the through holes are formed as notched through holes. The two through holes were formed at both ends of the side along the long side or the short side of the holder part. For example, when a notch through-hole is formed at a diagonal position of the holder part, it may be possible that the deformation due to expansion cannot be released well and stress is applied to the liquid crystal panel. Therefore, by forming the notched through hole along one side instead of the diagonal position, it is possible to control the direction of expansion and absorb deformation in that direction. Depending on the shape of the holder portion, the number of through holes (for example, two), or the positions where the through holes are formed, it is conceivable that the notched through holes are formed at diagonal positions.

  In the above, a portion having a small thickness is formed as an attenuation portion that attenuates transmission of force. However, the configuration of the attenuation unit is not limited to this, and the attenuation unit may be configured by another member such as an elastic body capable of absorbing force. Other configurations may be used.

  It is also possible to combine at least two feature portions among the feature portions of each embodiment described above.

In addition, this technique can also take the following structures.
(1) a liquid crystal display element for modulating light;
A holding unit for holding the liquid crystal display element;
A coupling part integrally formed with the holding part, coupled to a fixing member that fixes the position of the liquid crystal display element;
An attenuation part that is formed in a region from the connecting part to the holding part, and attenuates the force transmitted from the connecting part to the holding part;
A liquid crystal display unit comprising: a holder part having a plurality of through holes formed in the connection part including a notch through hole partially opened, into which a connection member for connection with the fixing member is inserted. .
(2) The liquid crystal display unit according to (1),
The holding portion has a first thickness;
The attenuation unit is formed with a second thickness smaller than the first thickness.
(3) The liquid crystal display unit according to (2),
The connection portion is formed as the attenuation portion with the second thickness. A liquid crystal display unit.
(4) The liquid crystal display unit according to (2) or (3),
The second thickness is at least ½ or less of the first thickness. A liquid crystal display unit.
(5) The liquid crystal display unit according to any one of (2) to (4),
The holder portion has a substantially rectangular shape, and has two long side portions facing each other,
The holding portion is formed in a central region of each of the two long side portions,
The connecting portion is formed as four connecting portions at both ends of the two long side portions,
The attenuating portion is formed in the region of the two long side portions from the connecting portion to the holding portion with the second thickness. Liquid crystal display unit.
(6) The liquid crystal display unit according to (5),
The notch through-hole is opened toward an outer edge of the long side portion. Liquid crystal display unit.
(7) The liquid crystal display unit according to (5) or (6),
The notch through hole is formed in each of two connecting portions formed at the same end of the two long side portions of the four connecting portions.
(8) The liquid crystal display unit according to (5) or (6),
The notch through hole is formed in each of two connecting portions formed at both ends of one of the long side portions of the four connecting portions. Liquid crystal display unit.
(9) The liquid crystal display unit according to any one of (5) to (8),
The two long sides extend in the same direction as a connection direction of a flexible circuit board connected to the liquid crystal display element.
(10) The liquid crystal display unit according to any one of (1) to (4),
The holder part is substantially rectangular,
The holding portion is formed in a central region of the holder portion,
The connection part is formed as four connection parts at four corners of the holder part.
(11) The liquid crystal display unit according to any one of (1) to (10),
The liquid crystal display element is a reflective liquid crystal display element.

DESCRIPTION OF SYMBOLS 1 ... Projection type display apparatus 11 ... Light source 30,230 ... Liquid crystal display unit 31,231 ... Liquid crystal panel 32,232 ... Holder part 33,233 ... Flexible circuit board 34,234 ... Fixing member 42 ... Screw 45,245 ... Plurality Through hole 46, 246 ... Holding part 47, 247 ... Connecting part 48, 248 ... Attenuating part 49, 249 ... Notched through hole 261 ... Long side part

Claims (8)

  1. A liquid crystal display element for modulating light;
    Extending in the same direction, with the extending direction as the first direction, they are spaced apart from each other along a second direction orthogonal to the first direction, and along the second direction First and second sides each having a holding region for holding the liquid crystal display element in an opposing region;
    Four connecting portions provided at both ends of each of the first and second side portions and connected to a fixing member for fixing the position of the liquid crystal display element;
    In a region from the connecting portion provided at both ends of the first side portion to the holding region formed in the first side portion, the thickness is smaller than the representative thickness of the first side portion. A first attenuation part formed on
    In a region from the connecting portion provided at both ends of the second side portion to the holding region formed in the second side portion, the thickness is smaller than the representative thickness of the second side portion. A second attenuation portion formed in
    A notch through-hole formed in each of the connecting portions provided at both ends of the first side portion and partially opened in which a connecting member for connecting to the fixing member is inserted;
    A liquid crystal display unit comprising: a holder portion that includes a through hole that is formed in each of the connecting portions provided at both ends of the second side portion and has a closed entire periphery into which the connecting member is inserted.
  2.   The liquid crystal display unit according to claim 1,
      The fixing member has four through holes that are closed on the entire circumference in which the connecting member is inserted,
      The notched through hole formed at both ends of the first side part and the closed through hole formed at both ends of the second side part are closed on the fixing member. It is formed according to the position and shape of the four through holes
      Liquid crystal display unit.
  3. The liquid crystal display unit according to claim 1 or 2 ,
    The liquid crystal display unit, wherein the cutout through hole formed in each of the connecting portions provided at both ends of the first side portion is opened toward an outer edge of the first side portion.
  4. The liquid crystal display unit according to any one of claims 1 to 3 ,
    The connecting portions provided at both ends of the first side portion are formed as the first attenuation portion,
    The said connection part provided in the both ends of the said 2nd side part is formed as a said 2nd attenuation | damping part Liquid crystal display unit.
  5. The liquid crystal display unit according to any one of claims 1 to 4 ,
    The thickness of the first attenuation portion is at least ½ or less of the representative thickness of the first side portion,
    The liquid crystal display unit, wherein the thickness of the second attenuation portion is at least ½ or less of the representative thickness of the second side portion.
  6. A liquid crystal display unit according to any one of claims 1 to 5 ,
    The liquid crystal display element is a reflective liquid crystal display element.
  7. A light source that emits light;
    A liquid crystal display device for modulating light from said light source, a liquid crystal display unit having a holder portion,
    A fixing member for fixing the position of the liquid crystal display element by being connected to the holder portion ;
    The holder part is
    Extending in the same direction, with the extending direction as the first direction, they are spaced apart from each other along a second direction orthogonal to the first direction, and along the second direction First and second sides each having a holding region for holding the liquid crystal display element in an opposing region;
    Provided at both ends of each of said first and said second side portion, and four connecting portions which are connected to the front Symbol fixed member,
    In a region from the connecting portion provided at both ends of the first side portion to the holding region formed in the first side portion, the thickness is smaller than the representative thickness of the first side portion. A first attenuation part formed on
    In a region from the connecting portion provided at both ends of the second side portion to the holding region formed in the second side portion, the thickness is smaller than the representative thickness of the second side portion. A second attenuation portion formed in
    A notch through-hole formed in each of the connecting portions provided at both ends of the first side portion and partially opened in which a connecting member for connecting to the fixing member is inserted;
    Formed in each of the connecting portions provided at both ends of the second side portion, that having a a through hole all around is closed the connecting member is inserted
    Projection display device.
  8.   It is a projection type display device according to claim 7,
      The fixing member has four through holes that are closed on the entire circumference in which the connecting member is inserted.
      Projection display device.
JP2017030690A 2017-02-22 2017-02-22 Liquid crystal display unit and projection display device Active JP6311808B2 (en)

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JPH09138405A (en) * 1995-11-16 1997-05-27 Hitachi Device Eng Co Ltd Liquid crystal display device
JP3639602B2 (en) * 1997-09-17 2005-04-20 日立デバイスエンジニアリング株式会社 Liquid crystal display
JP2002116430A (en) * 2000-10-10 2002-04-19 Advanced Display Inc Liquid crystal display device
JP2002261377A (en) * 2001-02-27 2002-09-13 Hitachi Ltd Optical module
US6731354B2 (en) * 2001-03-22 2004-05-04 Aurora Systems, Inc. Liquid crystal display mount including a frame having stress relief recess
JP3898520B2 (en) * 2002-01-30 2007-03-28 京セラ株式会社 Optical semiconductor element storage package and optical semiconductor device
JP5078650B2 (en) * 2008-02-12 2012-11-21 キヤノン株式会社 Image display device

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