JP2018036447A - Display device and display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of suppressing temperature elevation of the display device compared to the prior arts.SOLUTION: A display device 1 includes a liquid crystal display element 11, a heat sink 20, and a light-shielding member 30. The liquid crystal display element 11 has a display pixel region 14 constituted by a plurality of pixels for displaying an image. Heat generated in the liquid crystal display element 11 is conducted to the heat sink 20. The light-shielding member 30 blocks light in a region of the liquid crystal display element 11 other than the display pixel region 14. The display device 1 has a cylindrical ventilation passage AD an outer periphery of which is constituted by the light-shielding member 30 and the heat sink 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device and a display device.

  In recent years, a display device such as a projector that enlarges and projects an image with high contrast using a display device such as a small reflective liquid crystal display device has attracted attention. By illuminating the illumination light emitted from the light source with a display device and reflecting it, the image can be projected on a screen or the like.

  In order to enlarge and project an image with high contrast, it is important to lower the black level of the outer peripheral area of the display image. Patent Document 1 describes that a region other than the display pixel region of the display device is shielded by a light shielding plate.

JP 2003-43442 A

  In order to enlarge and project an image with high contrast, a display device is irradiated with high-energy illumination light. High energy illumination light is also applied to the light shielding plate. By irradiation with high-energy illumination light, the temperature of the display device and the light shielding plate rises. In recent years, the heat generated by driving the display device is increasing due to the miniaturization and high resolution of the display device.

  Therefore, the temperature of the display device rises due to heat generated by irradiation of illumination light, heat generated by driving the display device, and heat conducted from the light shielding plate. The increase in the temperature of the display device becomes a factor that deteriorates the quality of the display image, makes the operation of the display device unstable, and shortens the life of the display device.

  An object of this invention is to provide the display device and display apparatus which can suppress the temperature rise of a display device rather than before.

  The present invention provides a liquid crystal display element having a display pixel region composed of a plurality of pixels for displaying an image, a heat sink through which heat generated in the liquid crystal display element is conducted, and the display pixel of the liquid crystal display element There is provided a display device comprising: a light shielding member that shields light other than the region; and a cylindrical ventilation path having an outer peripheral portion constituted by the light shielding member and the heat sink.

  In addition, the present invention includes a light source that emits illumination light and a display device that is irradiated with the illumination light, and the display device includes a plurality of pixels, and the illumination light is modulated for each pixel. A liquid crystal display element having a pixel region; a heat sink through which heat generated in the liquid crystal display element is conducted; and a light shielding member that shields a region other than the display pixel region of the liquid crystal display element; Provided is a display device characterized by having a cylindrical ventilation path whose outer peripheral portion is constituted by a heat sink.

  According to the display device and the display device of the present invention, it is possible to suppress the temperature increase of the display device as compared with the conventional case.

It is a perspective view which shows the display device of one Embodiment. It is an exploded view of the display device of one Embodiment. It is sectional drawing of the display device 1 cut | disconnected by AA of FIG. It is a block diagram which shows the display apparatus of one Embodiment. It is a perspective view which shows the display device of other embodiment.

  A configuration example of the display device 1 according to an embodiment will be described with reference to FIGS. As the display device 1, a reflective liquid crystal display device will be described as an example. FIG. 1 shows a state in which the display device 1 is viewed from the display pixel region 14 side. FIG. 2 shows each component in a state where the display device 1 is disassembled. FIG. 3 shows a cross section of the display device 1 cut along A-A in FIG.

  As shown in FIG. 1 or FIG. 2, the display device 1 includes a liquid crystal display unit 10, a heat sink 20, a light shielding member 30, and a heat insulating member 40. The liquid crystal display unit 10 includes a liquid crystal display element 11, a flexible wiring board 12, and a connector 13.

  The liquid crystal display element 11 has a display pixel region 14 composed of a plurality of pixels for displaying an image. An LCOS (Liquid Crystal On Silicon) element may be used as the liquid crystal display element 11. The liquid crystal display element 11 and the connector 13 are electrically connected via the flexible wiring board 12.

  By driving the liquid crystal display element 11 from the outside via the connector 13 and the flexible wiring board 12, the illumination light L1 irradiated to the display pixel region 14 is light-modulated for each pixel and reflected to become image light L2. .

  Heat generated by the illumination light L1 being applied to the liquid crystal display element 11 and heat generated by driving the liquid crystal display element 11 are conducted to the heat sink 20. The heat sink 20 suppresses the temperature rise of the liquid crystal display element 11 by releasing the heat conducted from the liquid crystal display element 11 to the outside. The heat sink 20 includes a concave portion 21, a convex portion 22, and a heat radiation fin 23. For example, a cylindrical positioning pin 24 is formed on the convex portion 22.

  An aluminum alloy (for example, A6063 (material symbol)) may be used as the material of the heat sink 20. A6063 is an aluminum alloy containing magnesium and silicon, is easily available, and has good machinability. The thermal conductivity of A6063 is 220 W / (m × ° C.).

  For example, the liquid crystal display element 11 and the heat sink 20 can be accurately aligned by positioning the outer peripheral surface of the liquid crystal display element 11 and the inner peripheral surface of the recess 21 of the heat sink 20. The flexible wiring board 12 is fixed to the heat sink 20 by fixing the holding plate 2 to the heat sink 20 via the flexible wiring board 12 with screws 3.

  The light shielding member 30 has a positioning hole 31 and an opening 32. The light shielding member 30 has a cylindrical shape in which openings APa and APb are formed. The light shielding member 30 is preferably made of a thin plate material having high thermal conductivity so that heat generated by the illumination light L1 can be efficiently emitted. An aluminum-based material (for example, A1050 (material symbol)) may be used as the material of the light shielding member 30. A1050 has a plate thickness of 0.1 mm, and its thermal conductivity is 230 W / (m × ° C.). The thickness of the light shielding member 30 is, for example, 0.5 mm.

  As long as the light shielding member 30 has a higher thermal conductivity than the heat insulating member 40, other materials may be used. For example, when A5052 (material symbol) of an easily available aluminum material is used as the material of the light shielding member 30, the thermal conductivity of A5052 is 138 W / (m × ° C.). As will be described later, when SUS304 (material symbol) is used as the material of the heat insulating member 40, the thermal conductivity of SUS304 is 167 W / (m × ° C.). That is, the thermal conductivities of A1050 and A5052 that are the material of the light shielding member 30 are smaller than the thermal conductivities of SUS304 that is the material of the heat insulating member 40.

  You may make the contact surface with the heat insulation member 40 of the light shielding member 30 uneven | corrugated shape, for example by surface treatments, such as an embossing process. By making the surface of the light shielding member 30 uneven, the contact area with the heat insulating member 40 can be reduced, so that heat conduction from the light shielding member 30 to the heat insulating member 40 can be suppressed.

  The heat insulating member 40 has a positioning hole 41 and an opening 42. The thickness of the heat insulating member 40 is 0.2 mm, for example. The heat insulating member 40 is interposed between the light shielding member 30 and the liquid crystal display element 11. When the heat insulating member 40 is thick, the interval between the light shielding member 30 and the liquid crystal display element 11 is widened, so that unnecessary light is likely to enter the liquid crystal display element 11. On the other hand, when the heat insulating member 40 is thin, workability when handling the heat insulating member 40 is deteriorated. It is desirable to determine the thickness of the heat insulating member 40 based on these balances.

  The light shielding member 30 and the heat insulating member 40 are fixed to the heat sink 20 by being fastened together with the screw 3 to the convex portion 22 of the heat sink 20. By fitting the positioning hole 31 and the positioning hole 41 with the positioning pin 24, the light shielding member 30, the heat insulating member 40, and the heat sink 20 can be accurately aligned.

  FIG. 3 shows a state in which the liquid crystal display element 11, the heat insulating member 40, and the light shielding member 30 are fixed to the heat sink 20. The liquid crystal display element 11 is fixed to the bottom surface 21 a of the recess 21 of the heat sink 20 via a heat conducting member 25 such as a heat radiating gel. The heat generated in the liquid crystal display element 11 can be efficiently conducted to the heat sink 20 via the heat conducting member 25. In order to efficiently conduct heat generated in the liquid crystal display element 11, the bottom surface 21a of the recess 21 is preferably smooth.

  The light shielding member 30 shields the area other than the display pixel area 14 of the liquid crystal display element 11. As a result, the illumination light L <b> 1 is applied to the display pixel region 14 of the liquid crystal display element 11, and regions other than the display pixel region 14 are blocked by the light shielding member 30. In order to prevent unnecessary light generated by the reflection of the illumination light L1, it is preferable to treat the surface of the light shielding member 30 with black alumite. By anodizing the contact surface of the light shielding member 30 with the heat insulating member 40, heat conduction from the light shielding member 30 to the heat insulating member 40 can be suppressed.

  The heat insulating member 40 is disposed in the gap between the light shielding member 30, the liquid crystal display element 11, and the heat sink 20. By interposing the heat insulating member 40, heat generated in the light shielding member 30 is prevented from being conducted to the liquid crystal display element 11 and the heat sink 20. Therefore, as described above, the heat insulating member 40 is formed of a material having a lower thermal conductivity than the light shielding member 30.

  Stainless steel (for example, SUS304) may be used as the material of the heat insulating member 40. Since SUS304 has high material strength and high corrosion resistance, it can be used without surface treatment. In addition, SUS304 can be obtained in units of 0.1 mm in thickness, and can easily perform outer shape processing such as sheet metal processing. The material of the heat insulating member 40 may be other than stainless steel as long as it has a lower thermal conductivity than the material constituting the light shielding member 30.

  The contact surface of the heat insulating member 40 with the light shielding member 30 may be formed into an uneven shape by a surface treatment such as an emboss treatment. By making the surface of the heat insulating member 40 uneven, the contact area with the light shielding member 30 can be reduced, so that heat conduction from the light shielding member 30 to the heat insulating member 40 can be suppressed.

  The opening 32 of the light shielding member 30 and the opening 42 of the heat insulating member 40 are formed at positions corresponding to the display pixel region 14 of the liquid crystal display element 11. By accurately aligning the liquid crystal display element 11, the light shielding member 30, the heat insulating member 40, and the heat sink 20, the openings 32 and 42 and the display pixel region 14 can be accurately aligned.

  When the illumination light L1 is applied to the liquid crystal display element 11, the illumination light L1 applied to the display pixel region 14 is light-modulated for each pixel in the display pixel region 14 and becomes image light L2. The illumination light L <b> 1 irradiated to the area other than the display pixel area 14 is blocked by the light shielding member 30.

  The height of the convex portion 22 of the heat sink 20 is designed so that the light shielding member 30 and the heat insulating member 40 are positioned in the vicinity of the liquid crystal display element 11. By arranging the light shielding member 30 in the vicinity of the liquid crystal display element 11, it is possible to reduce the incidence of stray light that causes the quality of the display image to deteriorate.

  The light shielding member 30 is fixed to the convex portion 22 of the heat sink 20 via the heat insulating member 40. Therefore, the heat insulating member 40 can prevent heat generated by irradiating the light shielding member 30 with the high-energy illumination light L <b> 1 from being conducted to the heat sink 20 and the liquid crystal display element 11. In order to more effectively prevent heat conduction from the light shielding member 30 to the heat sink 20, the heat insulating member 40 preferably has a shape that covers the side surface 20 a of the heat sink 20.

  Even if a part of the heat generated in the light shielding member 30 is conducted to the heat sink 20 via the heat insulating member 40, the heat insulating member 40 is only a partial region of the heat sink 20 (specifically, the upper surface of the convex portion 22). Therefore, heat conduction to the heat sink 20 can be suppressed.

  The display device 1 has a cylindrical ventilation path AD having an outer peripheral portion constituted by the light shielding member 30 and the heat sink 20 (specifically, the heat radiating fins 23). By sending air into the ventilation path AD or exhausting the inside of the ventilation path AD and introducing air from the outside, it is possible to stabilize the blowing direction and efficiently cool the heat sink 20 and the light shielding member 30.

  For example, in FIG. 1, air is sent from the opening APa toward the opening APb into the ventilation path AD, or exhausted through the ventilation path AD from the opening APa and air is introduced from the opening APb. The direction can be stabilized and the heat sink 20 and the light shielding member 30 can be efficiently cooled.

  The ventilation path AD may have a gap CR or a hole as long as it functions as a ventilation path for cooling the heat sink 20 and the light shielding member 30. Further, the gap CR and the hole may be closed with a tape or the like.

  As shown in FIG. 3, heat radiation fins 33 for cooling the light shielding member 30 may be formed on the light shielding member 30. By disposing the radiating fins 33 in the ventilation path AD and sending the air into the ventilation path AD or exhausting the ventilation path AD and introducing air from the outside, the light shielding member 30 is cooled more efficiently. be able to.

  A configuration example of the display device 50 according to an embodiment will be described with reference to FIG. The display device 50 includes a light source 51, dichroic mirrors 52 and 53, a reflection mirror 54, light uniformizing optical systems 55 and 56, polarization beam filters 57R, 57G, and 57B, a combining optical system 58, and a projection lens 59. And a fan 60 and three display devices 1. In order to distinguish the three display devices 1, a display device for generating a red image is denoted by 1R, a display device for generating a green image is denoted by 1G, and a display device for generating a blue image is denoted by 1B.

  The illumination light L1 emitted from the light source 51 is irradiated to the dichroic mirror 52. The dichroic mirror 52 reflects the blue component of the illumination light L1 to produce blue illumination light L1B. The dichroic mirror 52 transmits the yellow component including the red component and the green component of the illumination light L1 to obtain the yellow illumination light L1Y.

  The blue illumination light L <b> 1 </ b> B is reflected by the reflection mirror 54 and enters the light uniformizing optical system 55. The light homogenizing optical system 55 makes the illumination distribution of the blue illumination light L1B uniform and optimizes the polarization state. The light homogenizing optical system 55 may include an integrator or a light pipe, and a polarizing plate or a polarization conversion element (PCS (Polarization Conversion System)). The integrator and the light pipe make the illumination distribution of the blue illumination light L1B uniform. The polarizing plate and the PCS optimize the polarization state of the blue illumination light L1B. The light homogenizing optical system 55 converts the blue illumination light L1B to p-polarized light.

  The blue illumination light L1B emitted from the light homogenizing optical system 55 is applied to the polarization beam filter 57B. For example, the polarization beam filter 57B transmits p-polarized light and reflects s-polarized light. The p-polarized blue illumination light L1B passes through the polarization beam filter 57B and is irradiated to the display device 1B. The display device 1B optically modulates the blue illumination light L1B into s-polarized blue image light L2B. The blue image light L2B is reflected by the polarization beam filter 57B and enters the combining optical system 58.

  The yellow illumination light L1Y is incident on the light uniformizing optical system 56. The light homogenizing optical system 56 makes the illumination distribution of the yellow illumination light L1Y uniform and optimizes the polarization state. The light homogenizing optical system 56 may include an integrator or light pipe and a polarizing plate or PCS. The integrator and the light pipe make the illumination distribution of the yellow illumination light L1Y uniform. The polarizing plate and the PCS optimize the polarization state of the yellow illumination light L1Y. The light homogenizing optical system 56 converts the yellow illumination light L1Y into p-polarized light.

  The yellow illumination light L <b> 1 </ b> Y emitted from the light homogenizing optical system 56 is applied to the dichroic mirror 53. The dichroic mirror 53 reflects the green component of the yellow illumination light L1Y into the green illumination light L1G. The dichroic mirror 53 transmits the red component of the yellow illumination light L1Y to produce red illumination light L1R.

  The green illumination light L1G is applied to the polarization beam filter 57G. The polarization beam filter 57G transmits p-polarized light and reflects s-polarized light. The green illumination light L1G that is p-polarized light passes through the polarization beam filter 57G and is irradiated on the display device 1G. The display device 1G optically modulates the green illumination light L1G into s-polarized green image light L2G. The green image light L2G is reflected by the polarization beam filter 57G and enters the combining optical system 58.

  The red illumination light L1R is applied to the polarization beam filter 57R. The polarization beam filter 57R transmits p-polarized light and reflects s-polarized light. The red illumination light L1R that is p-polarized light passes through the polarization beam filter 57R and is irradiated to the display device 1R. The display device 1R optically modulates the red illumination light L1R into s-polarized red image light L2R. The red image light L2R is reflected by the polarization beam filter 57R and enters the combining optical system 58.

  The combining optical system 58 combines the red image light L2R, the green image light L2G, and the blue image light L2B. The projection lens 59 enlarges and projects the red image light L2R, the green image light L2G, and the blue image light L2B combined by the combining optical system 58 onto a screen or the like as a full color image.

  The fan 60 sends air into the ventilation path AD of the display device 1 (1R, 1G, 1B) or exhausts the ventilation path AD to introduce air from the outside. Thereby, the ventilation direction can be stabilized and the heat sink 20 and the light shielding member 30 can be cooled efficiently.

  The display device 1 and the display device 50 described above have a cylindrical ventilation path AD having an outer peripheral portion constituted by the light shielding member 30 and the heat sink 20. By sending air into the ventilation path AD or exhausting the inside of the ventilation path AD and introducing air from the outside, it is possible to stabilize the blowing direction and efficiently cool the heat sink 20 and the light shielding member 30.

  Further, the display device 1 and the display device 50 have a configuration in which the heat insulating member 40 is disposed in the gap between the light shielding member 30, the liquid crystal display element 11, and the heat sink 20. By interposing the heat insulating member 40, it is possible to suppress the heat generated in the light shielding member 30 from being conducted to the liquid crystal display element 11 and the heat sink 20.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, when other components are arranged in the vicinity of the display device 1 in the display device 50, the light shielding member 30 may not have the shape shown in FIG. In such a case, as shown in FIG. 5, the light shielding member 30 may have a shape that avoids other components.

  Further, when the light shielding member 30 needs to have a complicated shape, the light shielding member 30 may be configured by a plurality of members. You may make it fix a some member using a plastic rivet, a fastener, or a tape.

DESCRIPTION OF SYMBOLS 1 Display device 11 Liquid crystal display element 14 Display pixel area 20 Heat sink 30 Light-shielding member 40 Heat insulation member AD Ventilation path

Claims (4)

A liquid crystal display element having a display pixel region composed of a plurality of pixels for displaying an image;
A heat sink through which heat generated in the liquid crystal display element is conducted;
A light shielding member that shields a region other than the display pixel region of the liquid crystal display element,
A display device comprising a cylindrical ventilation path having an outer peripheral portion constituted by the light shielding member and the heat sink. The display device according to claim 1, further comprising a heat insulating member arranged in a gap between the light shielding member, the liquid crystal display element, and the heat sink. A light source that emits illumination light;
A display device irradiated with the illumination light,
The display device is
A liquid crystal display element composed of a plurality of pixels and having a display pixel region for optically modulating the illumination light for each pixel;
A heat sink through which heat generated in the liquid crystal display element is conducted;
A light shielding member that shields a region other than the display pixel region of the liquid crystal display element,
A display device comprising a cylindrical ventilation path having an outer peripheral portion constituted by the light shielding member and the heat sink. The display device according to claim 3, further comprising a heat insulating member disposed in a gap between the light shielding member, the liquid crystal display element, and the heat sink.

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