JP2018018842A - Heat dissipation structure and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat dissipation structure in which a heat conductive member is pressed by proper strength, and also to provide a display device.SOLUTION: Housings 50 and 250 have heat dissipation members 51 and 251. Display panels 10 and 210 are housed in the housings 50 and 250. Heat conductive members 6, 7 and 8 are composed of an elastic body abutting on the heat dissipation members 51 and 251. The heat dissipation members 51 and 251 have a plurality of protrusions 51k, 251t and 251u for pressing the heat conductive members 6, 7 and 8. The protrusions 51k, 251t and 251u have a linear shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat dissipation structure that dissipates heat through a heat conducting member and a display device.

  Conventionally, various heat dissipation structures that dissipate heat generated by electrical components through a heat conducting member called TIM (Thermal Interface Material) have been proposed, and for example, disclosed in Patent Document 1. The heat generated by the electrical component is transmitted to a heat radiating member such as a heat sink through the heat conducting member, and is dissipated by the heat radiating member. The heat conducting member is pressed by a heat receiving portion provided on the heat radiating member and is in close contact with the heat generating component.

JP, 2006-109798, A

However, since the force that presses the heat conducting member is weak, heat conduction at the contact surface between the heat generating component and the heat conducting member is reduced, and heat may not be transmitted to the heat radiating member. Further, there is a possibility that a problem may occur when the force for pressing the heat conducting member is too strong. That is, there is a problem that good heat conduction cannot be obtained when the force pressing the heat conducting member is too weak or too strong.
This invention is made | formed in view of such a problem, and provides the thermal radiation structure and display apparatus which press a heat conductive member with appropriate intensity | strength.

  The present invention is a heat radiating structure that radiates heat at the heat radiating members 51, 251 through the heat conducting members 6, 7, 8 made of an elastic body in contact with the heat radiating members 51, 251, Has a plurality of protrusions 51k, 251t, 251u for pressing the heat conducting members 6, 7, 8.

  In the present invention, the protrusions 51k, 251t, and 251u are linear.

  In addition, the present invention is a heat conduction comprising a housing 50, 250 having heat radiating members 51, 251; The heat radiating members 51, 251 have a plurality of projecting portions 51k, 251t, 251u that press the heat conducting members 6, 7, 8.

  In the present invention, the protrusions 51k, 251t, and 251u are linear.

  By providing the heat radiating member with a plurality of protrusions that press the heat conducting member, the heat conducting member can be pressed with an appropriate strength.

Sectional drawing which shows 1st embodiment of this invention. The block diagram which shows embodiment same as the above. The principal part enlarged view which shows embodiment same as the above. The principal part enlarged view which shows a comparative example. Sectional drawing which shows 2nd embodiment of this invention. The block diagram which shows embodiment same as the above. The principal part enlarged view which shows embodiment same as the above. The principal part enlarged view which shows embodiment same as the above.

  Hereinafter, an embodiment in which the present invention is applied to a vehicle display device will be described with reference to the accompanying drawings. 1 to 3 show a first embodiment. The vehicle display device includes a liquid crystal display panel 10, a light guide plate 20, a light emitting element 30, a circuit board 40, a housing 50, a circuit board 70, a case body 90, and the like.

  The liquid crystal display panel 10 has a polarizing plate attached to both front and rear surfaces of a TFT type liquid crystal panel in which liquid crystal is sealed in a pair of glass substrates on which transparent electrodes are formed, and vehicle information such as vehicle speed and engine speed is stored. Displayed as an image. The liquid crystal display panel 10 is electrically connected to the circuit board 40 by a flexible wiring board (not shown).

  The light guide plate 20 is made of a translucent resin such as acrylic and has a flat plate shape. The light guide plate 20 is disposed on the rear surface side of the liquid crystal display panel 10. Optical sheets 21 such as a light diffusion sheet, a light reflection sheet, and a brightness enhancement film are disposed on the front and rear surfaces of the light guide plate 20. The light guide plate 20 is held by the case body 90 and is parallel to the liquid crystal display panel 10.

  The light emitting elements 30 are composed of a plurality of light emitting diodes, and are arranged in a row along the side end face 20 a of the light guide plate 20. The light emitting element 30 is mounted on the hard wiring board 31 and emits illumination light to the side end face 20 a of the light guide plate 20. The illumination light emitted from the light emitting element 30 is guided to the rear surface side of the liquid crystal display panel 10 by the light guide plate 20.

  The circuit board 40 is formed by forming a wiring pattern on a base material made of glass epoxy resin, and is disposed on the rear surface side of the middle case 53. A display controller 60 that controls the liquid crystal display panel 10 is mounted on the rear surface of the circuit board 40. The circuit board 40 is accommodated in a rear case 51 of the housing 50 and is fixed by screws 1. The circuit board 40 is disposed in parallel with the liquid crystal display panel 10 and the light guide plate 20.

  The housing 50 includes a rear case 51, a translucent cover 52, and a middle case 53, and houses the liquid crystal display panel 10, the light guide plate 20, the light emitting element 30, the circuit board 40, the circuit board 70, the case body 90, and the like. To do. The rear case 51 is made of a metal such as magnesium (Mg) or aluminum (Al). Heat receiving portions 51b and 51c are formed in the rear case 51, and heat conducting members 5 and 6 are disposed in the heat receiving portions 51b and 51c. The heat receiving portions 51 b and 51 c have a shape protruding from the bottom wall of the rear case 51 to the front side.

  The display controller 60 mounted on the circuit board 40 is in contact with the heat receiving portion 51 b of the rear case 51 via the heat conducting member 5. The heat conductive member 5 is made of an elastic body having good heat conductivity, and is called a TIM (Thermal Interface Material) or a heat conductive sheet. The heat generated by the display controller 60 is transmitted to the heat receiving portion 51 b of the rear case 51 through the heat conducting member 5 and is dissipated by the rear case 51.

  The translucent cover 52 of the housing 50 is made of a translucent resin such as acrylic and is disposed in front of the liquid crystal display panel 10. The image displayed on the liquid crystal display panel 10 is viewed through the translucent cover 52. The translucent cover 52 is fixed to the rear case 51 with the screw 2 via the flange portion 53 f of the middle case 53.

  The middle case 53 is made of an opaque resin and houses the light guide plate 20, the light emitting element 30, the circuit board 70, the case body 90, and the like. A circuit board 40 is fixed behind the middle case 53 with screws 1. A hole 53h through which the heat receiving portion 51c passes is formed in the bottom wall 62 of the middle case 53.

  The circuit board 70 is formed by forming a wiring pattern on a base material made of glass epoxy resin, and is disposed between the circuit board 40 and the case body 90. A microcomputer 80 is mounted on the rear surface of the circuit board 70. The circuit board 70 is accommodated in the middle case 53, and is fixed to the bottom wall 53b of the middle case 53 by screws (not shown). The circuit board 70 is disposed in parallel with the liquid crystal display panel 10, the light guide plate 20, and the circuit board 40.

  The case body 90 is made of a metal such as stainless steel (SUS) and houses the light guide plate 20, the light emitting element 30, and the like. The case body 90 is in contact with the rear case 51 in the vicinity of the light emitting element 30 via the heat conducting member 6. The heat conducting member 6 is made of an elastic body having good heat conductivity, and is called a TIM (Thermal Interface Material) or a heat conducting sheet. The heat generated by the light emitting element 30 is transmitted to the heat receiving portion 51 c of the rear case 51 via the hard wiring board 31, the case body 90 and the heat conducting member 6, and is dissipated by the rear case 51.

  FIG. 2 is a block diagram showing an electrical configuration of the vehicle display device. The microcomputer 80 includes a CPU 81, a nonvolatile memory 82, and a volatile memory 83 and is mounted on the circuit board 70. The nonvolatile memory 82 is composed of, for example, a flash memory, and the volatile memory 83 is composed of, for example, an SDRAM (Synchronous Dynamic Random Access Memory).

  The speed sensor 101 detects the vehicle speed and outputs speed data to the microcomputer 80. The rotation sensor 102 detects the rotation speed of the engine and outputs rotation speed data to the microcomputer 80. The microcomputer 80 controls the display controller 60 and drives the light emitting element 30 based on a predetermined program stored in the nonvolatile memory 82. The display controller 60 displays an image on the liquid crystal display panel 10 based on the control signal output from the microcomputer 80.

  Next, based on FIG. 3, the heat receiving part 51c and the heat conductive member 6 are further explained in full detail. FIG. 3A shows a state before the heat conducting member 6 is pressed by the heat receiving portion 51c, and FIG. 3B shows the case body 90 assembled to the middle case 53, and the heat conducting member 6 shown in FIG. Shows a state after being pressed by the heat receiving portion 51c.

  Three protrusions 51k having a height D are formed on the front surface 51d of the heat receiving portion 51c. In other words, a recess having a predetermined depth (= height D) is formed in the heat receiving portion 51c. The protruding portion 51k of the heat receiving portion 51c has a linear shape extending in the direction perpendicular to the paper surface. The three protrusions 51k have the same width W, and the three protrusions 51k have the same height D. The total width W of the three protruding portions 51k is less than half of the width W1 of the heat receiving portion 51c.

  The width of the heat conducting member 6 is the same as the width W1 of the heat receiving portion 51c. The thickness H2 of the heat conductive member 6 after being pressed by the heat receiving portion 51c is smaller than the thickness H1 of the heat conductive member 6 before being pressed by the heat receiving portion 51c. The thickness H3 of the heat conducting member 6 at the place where the protruding portion 51k is provided is smaller than the thickness H2 of the heat conducting member 6 at the place where the protruding portion 51k is not provided. The heat conducting member 6 is in contact with the front surface 51d and the protruding portion 51k of the heat receiving portion 51c.

  The thickness H2 of the heat conducting member 6 in a state after the case body 90 is assembled to the middle case 53 and the heat conducting member 6 is pressed by the heat receiving portion 51c depends on the tolerance of each member of the vehicle display device, etc. Although there is some variation for each product, by providing the protruding portion 51k in the heat receiving portion 51c, it is possible to press the heat conducting member 6 partly and strongly without applying excessive stress to the case body 90. The heat conducting member 6 can be pressed with a strong force.

  FIG. 4 is a diagram illustrating a comparative example. 4A shows a state before the heat conducting member 6 is pressed by the heat receiving portion 151c, and FIG. 4B shows a state after the heat conducting member 6 is pressed by the heat receiving portion 151c. Show.

  The front surface 151d of the heat receiving portion 151c is flat, and the protruding portion 51k is not formed. The thickness H2 of the heat conductive member 6 after being pressed by the heat receiving portion 151c is smaller than the thickness H1 of the heat conductive member 6 before being pressed by the heat receiving portion 151c.

  5 to 7 show a second embodiment. The vehicle display device includes a liquid crystal display panel 210, a light guide plate 220, a light emitting element 230, a circuit board 240, a housing 250, and the like.

  The liquid crystal display panel 210 has polarizing plates attached to both front and rear surfaces of a TFT type liquid crystal panel in which liquid crystal is sealed in a pair of glass substrates on which transparent electrodes are formed. Vehicle information such as vehicle speed and engine speed is provided. Displayed as an image. The liquid crystal display panel 210 is electrically connected to the circuit board 240 by a flexible wiring board (not shown). The liquid crystal display panel 210 is in close contact with the rear surface of the translucent cover 252 with a transparent ultraviolet curable adhesive.

  The light guide plate 220 is made of a translucent resin such as acrylic and has a flat plate shape. The light guide plate 220 is disposed on the rear side of the liquid crystal display panel 210. Optical sheets 221 such as a light diffusion sheet, a light reflection sheet, and a brightness enhancement film are disposed on the front and rear surfaces of the light guide plate 20. The light guide plate 220 is held by the case body 290 and is parallel to the liquid crystal display panel 210.

  The light emitting elements 230 are composed of a plurality of light emitting diodes, and are arranged in a row along the side end face 220 a of the light guide plate 220. The light emitting element 230 is mounted on the hard wiring board 231 and emits illumination light to the side end face 220 a of the light guide plate 220. The illumination light emitted from the light emitting element 230 is guided to the rear surface side of the liquid crystal display panel 210 by the light guide plate 220.

  The circuit board 240 is formed by forming a wiring pattern on a base material made of glass epoxy resin, and is disposed on the rear surface side of the middle case 253. A display controller 260 and a microcomputer 280 are mounted on the rear surface of the circuit board 240. The circuit board 240 is accommodated in the rear case 251 of the housing 250 and fixed by screws 1. The circuit board 240 is disposed in parallel with the liquid crystal display panel 210 and the light guide plate 220, respectively.

  The housing 250 includes a rear case 251, a translucent cover 252 and an intermediate case 253, and houses the liquid crystal display panel 210, the light guide plate 220, the light emitting element 230, the circuit board 240, and the like. The rear case 251 is made of a metal such as magnesium or aluminum. The rear case 251 is formed with heat receiving portions 251b and 251c. The heat receiving members 251b and 251c are provided with heat conducting members 7 and 8, respectively.

  Three protruding portions 251t are formed on the heat receiving portion 251b. Moreover, the three protrusion parts 251u are formed in the heat receiving part 251c. The protruding portions 251t and 251u of the heat receiving portions 251b and 251c are linearly extending in the direction perpendicular to the paper surface.

  The display controller 260 mounted on the circuit board 240 is in contact with the heat receiving portion 251 b of the rear case 251 through the heat conducting member 7. The heat conduction member 142 is made of an elastic body having good heat conductivity, and is called a TIM (Thermal Interface Material) or a heat conduction sheet. The heat generated by the display controller 260 is transmitted to the heat receiving part 251 b of the rear case 251 through the heat conducting member 7 and is dissipated by the rear case 251.

  The translucent cover 252 of the housing 250 is made of a translucent resin such as acrylic and is disposed in front of the liquid crystal display panel 210. An image displayed on the liquid crystal display panel 210 is viewed through the translucent cover 252. The translucent cover 252 is fixed to the middle case 253 with screws 2.

  The middle case 253 of the housing 250 is made of an opaque resin and houses the light guide plate 220, the light emitting element 230, the circuit board 270, the case body 290, and the like. A circuit board 240 is fixed behind the middle case 253 with screws 1.

  The case body 290 is made of a metal such as stainless steel and houses the light guide plate 220, the light emitting element 230, and the like. The case body 290 is in contact with the rear case 251 in the vicinity of the light emitting element 230 via the heat conducting member 8. The heat conducting member 8 is made of an elastic body having good heat conductivity, and is called a TIM (Thermal Interface Material) or a heat conducting sheet. The heat generated by the light emitting element 230 is transmitted to the heat receiving portion 251c of the rear case 251 through the hard wiring board 231, the case body 290, and the heat conducting member 8, and is dissipated by the rear case 251.

  FIG. 6 is a block diagram showing an electrical configuration of the vehicle display device. The microcomputer 280 has a CPU 281, a nonvolatile memory 282, and a volatile memory 283, and is mounted on the circuit board 240. The non-volatile memory 282 is made of, for example, a flash memory, and the volatile memory 283 is made of, for example, SDRAM (Synchronous Dynamic Random Access Memory).

  The speed sensor 101 detects the vehicle speed and outputs speed data to the microcomputer 280. The rotation sensor 102 detects the rotation speed of the engine and outputs rotation speed data to the microcomputer 280. The microcomputer 280 controls the display controller 260 and drives the light emitting element 230 based on a predetermined program stored in the nonvolatile memory 282. The display controller 260 displays an image on the liquid crystal display panel 210 based on the control signal output from the microcomputer 280.

  According to the second embodiment, by providing the heat receiving portions 251b and 251c with the protruding portions 251t and 251u, the heat conducting members 7 and 8 can be partially strongly pressed, and the circuit board 240 and the case body 290 are excessively pressed. Without applying the stress, it is possible to press the heat conducting members 7 and 8 with an appropriate strength.

  The present invention is not limited to the first and second embodiments, and various modifications can be made. For example, the protrusions 51k, 251t, and 251u are linear, but may be dot-like.

6 Thermal Conductive Member 7 Thermal Conductive Member 8 Thermal Conductive Member 10 Liquid Crystal Display Panel (Display Panel)
20 Light Guide Plate 30 Light Emitting Element 40 Circuit Board 50 Housing 51 Rear Case (Heat Dissipation Member)
51k Protrusion 60 Display controller 70 Circuit board 90 Case body 210 Liquid crystal display panel (display panel)
220 Light Guide Plate 230 Light Emitting Element 240 Circuit Board 250 Housing 251 Rear Case (Heat Dissipation Member)
251t Protruding part 251u Protruding part 260 Display controller 270 Circuit board 290 Case body

Claims (4)

  A heat radiating structure for radiating heat with the heat radiating member via a heat conductive member made of an elastic body in contact with the heat radiating member, wherein the heat radiating member has a plurality of protrusions that press the heat conductive member. Heat dissipation structure.   The heat dissipation structure according to claim 1, wherein the protrusion is linear.   A display device comprising a housing having a heat radiating member, a display panel accommodated in the housing, and a heat conducting member made of an elastic body in contact with the heat radiating member, wherein the heat radiating member is the heat conducting member. A display device comprising a plurality of protrusions that press the button.   The display device according to claim 3, wherein the protrusion is linear.

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