JP6432282B2 - Display device - Google Patents

Description

  The present invention relates to a display device mounted on a vehicle such as an automobile or a motorcycle.

  Conventionally, as this type of display device, for example, the one described in Patent Document 1 below is known. The display device described in Patent Document 1 includes a vehicle instrument mounted on a vehicle, and includes a display unit including a liquid crystal display panel that displays predetermined information, and a rear side of the display unit (a viewer side of the display unit). A display unit having a hard circuit board disposed on the opposite side), an electronic component with heat generation mounted (mounted) on the circuit board, and a resin casing for housing the display unit .

  In this case, a mounting boss made of aluminum is arranged behind the display means via a heat transfer sheet made of graphite, and heat generated from the display means is transferred to the housing via the heat transfer sheet. The heat is dissipated to the outside of the apparatus by being transmitted to the mounting boss arranged so as to face the opening.

JP 2014-10226 A

In the case of the display device described in Patent Document 1 described above, the heat generated from the display means is dissipated to the outside of the device using an attachment boss formed of a heat transfer sheet and aluminum. By the way, when an electronic component with a plurality of heat generation is mounted on a circuit board in order to realize high functionality of the display device (vehicle instrument), the amount of heat generated from the plurality of electronic components is reduced. A structure that efficiently dissipates heat generated from electronic components to the outside of the apparatus is desired.
Accordingly, an object of the present invention is to provide a display device capable of increasing the heat radiation efficiency of heat generated from electronic components to the outside of the device in order to cope with the above-described problems.

The present invention provides a display unit having at least a display unit and a circuit board disposed on a side opposite to the viewer side of the display unit, an electronic component with heat generation mounted on the circuit board, and the display unit. In the display device including a housing for housing, the housing includes a wall portion having a hollow portion provided on the side opposite to the viewer side of the circuit board so as to contact the back surface of the circuit board ; The heat radiation portion embedded in the cavity portion is integrally formed, and is screwed to the display unit by a screw that penetrates the penetration portion formed in the heat radiation portion, and the cavity portion is the circuit. A heat transfer member made of an elastic body is provided between the substrate and the heat dissipation part, and heat generated from the electronic component is configured to be transmitted to the heat dissipation part via the circuit board and the heat transfer member. That And butterflies.

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  Further, the invention is characterized in that the abutting portion of the wall portion that abuts on the heat radiating portion has such a shape that the opening width of the cavity portion becomes narrower as the distance from the circuit board increases. .

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  ADVANTAGE OF THE INVENTION According to this invention, the initial purpose can be achieved and the display apparatus which can improve the thermal radiation efficiency to the exterior of the apparatus of the heat | fever emitted from an electronic component can be provided.

1 is a cross-sectional view of a display device according to an embodiment of the present invention (hatching is omitted). The principal part expanded sectional view of the display apparatus by the same embodiment (hatching is abbreviate | omitted). In FIG. 2, the expanded sectional view which shows the state which removed the thermal radiation part, the heat-transfer member, and the screw (hatching is abbreviate | omitted). The front view of the thermal radiation part by the embodiment.

  Hereinafter, based on FIGS. 1-3, one Embodiment which applied embodiment of this invention to the vehicle instrument mounted in the vehicle is described.

  In FIG. 1, a display device D as a vehicle instrument in the present embodiment includes a display unit 11 that is a display for a meter, a circuit board 12 that is arranged on the opposite side of the display unit 11 from the viewer E side, and a display unit. 11 is provided so as to cover a display unit 10 having a case body 13 for holding 11, a see-through panel 20 disposed on the front side of the display means 11 on the viewer E side, and a peripheral portion of the see-through panel 20. A black resin frame member 30, a housing 40 that houses the display unit 10, and a heat transfer member 50 that is disposed between the circuit board 12 and a heat dissipating unit (described later) provided in the housing 40 are provided. .

  For example, a TFT-type liquid crystal display panel can be applied as the display means 11, and various vehicle information such as vehicle speed information and fuel consumption information is displayed as visual information. In this case, the display means 11 is electrically connected to the circuit board 12 using a flexible wiring board (not shown).

  The circuit board 12 is made of a hard wiring board on which a predetermined conductive path is formed, and a plurality of electronic components 12a that generate heat are mounted (mounted) on the circuit board 12. Moreover, 12b is a 1st hole part which consists of a substantially circular through-hole which the screw | thread S penetrates (refer FIG. 2).

  The electronic component 12a is conductively connected to the conductive path, and for example, a microcomputer (control unit) that performs display control of the display unit 11 and various circuit components such as a capacitor can be applied.

  The case body 13 is made of a synthetic resin material and is made of a resin holder placed on the circuit board 12 so as to hold the peripheral edge on the back side of the display means 11. A second hole portion 13a including a substantially circular through hole is provided, and the second hole portion 13a communicates with the first hole portion 12b (see FIG. 2).

  Reference numeral 14 denotes a boss formed on the back side of the display unit 10 by heat welding or the like. The boss 14 is provided with a screw threaded portion (not shown) to which a screw S is threaded. The screw threaded portion is provided so as to correspond to both the first hole portion 12b and the second hole portion 13a.

  The see-through panel 20 is formed of a substantially flat translucent synthetic resin material and is provided so as to cover the display means 11. The viewer E can see through (view) the various vehicle information through the see-through panel 20.

  The housing 40 is formed of, for example, a black synthetic resin material, and includes a bottom wall portion 41 that covers the back side of the circuit board 12 and a side wall portion 42 that covers the side of the display unit 10.

  The bottom wall portion 41 of the housing 40 is provided with a substantially annular wall portion 44 having a hollow portion 43 provided on the back side of the circuit board 12 (that is, the side opposite to the viewer E side of the circuit board 12). Further, a heat radiating portion 45 made of a metal material such as aluminum is embedded in the hollow portion 43 (see FIG. 2). Here, paying attention to the wall portion 44 and the heat radiating portion 45, the wall portion 44 formed of a substantially annular standing wall portion continuously formed on the bottom wall portion 41 and the heat radiating portion embedded in the cavity portion 43 of the wall portion 44. 45 is integrally formed using a technique such as insert molding.

  The wall portion 44 includes a first annular portion 44 a provided so as to contact the back surface of the circuit board 12, and a second annular portion 44 b that connects the first annular portion 44 a and the bottom wall portion 41. Further, the heat radiating portion 45 as an insert boss body having a heat radiating function is disposed in the hollow portion 43 in close contact with the wall portion 44 (each annular portion 44a, 44b).

  Here, 43 hollow portions corresponding to the first annular portion 44a correspond to the first hollow portion 43a and the second annular portion 44b, and 43 hollow portions excluding the first hollow portion 43a. Let it be the second cavity 43b (see FIG. 3). When attention is paid to the opening width of each of the hollow portions 43a and 43b, as shown in FIG. 3, the opening width of the first hollow portion 43a is slightly narrower than the opening width of the second hollow portion 43b. Yes.

  As shown in FIG. 2, the heat dissipating part 45 includes an annular part 45 a and an annular hanging part 45 b that is formed to hang from the peripheral edge on the back side of the annular part 45 a. A third hole 45c serving as a through-hole including a substantially circular through-hole through which the screw S passes is provided in a substantially central portion of the annular portion 45a. The third hole 45c is formed of the first hole 12b. And the second hole 13a.

  In this case, the annular part 45a is embedded in the cavity part 43 located inside the wall part 44 so as to straddle the first cavity part 43a and the second cavity part 43b, and is embedded in the first cavity part 43a. A first annular portion 46 provided at a corresponding position and a second annular portion 47 provided at a position corresponding to the second cavity 43b are provided.

  Reference numeral 48 denotes a protrusion as an anti-rotation preventing part that prevents the heat dissipation part 45 from idling when the display unit 10 and the housing 40 are fixed with screws S. The protrusion 48 is a heat dissipation part. 45 (annular portion 45a) is provided in the first annular portion 46. Specifically, in this case, four protrusions 48 are provided at equal intervals on the upper end portion of the first annular portion 46 on the viewer E side (see FIG. 4). 1 and 2 show cross-sectional views of the portion where the protrusion 48 is formed.

  Further, the contact portion 49 of the second annular portion 44b (wall portion 44) that is in contact with the outer peripheral surface of the second annular portion 47 and the outer peripheral surface of the annular hanging portion 45b is further away from the circuit board 12. The hollow portion 43 (second hollow portion 43b) has a substantially inverted C-shaped inclined surface shape so that the opening width is narrow (see FIG. 2). Here, needless to say, the contact portion 49 of the second annular portion 44b (wall portion 44) is in surface contact (contact) with the entire circumference of the heat dissipation portion 45.

  The heat transfer member 50 is made of, for example, an annular elastic body having thermal conductivity formed of silicon rubber, and is disposed in a compressed state between the first annular portion 46 (heat radiation portion 45) and the circuit board 12. Has been. Specifically, the heat transfer member 50 is a space in the first cavity 43a (the cavity 43) formed between the circuit board 12, the first annular portion 44a, and the first annular portion 46. It is arranged in a compressed state.

  And in the center part of the heat-transfer member 50, the 4th hole part 51 which consists of a substantially circular through-hole which the screw S penetrates is provided, This 4th hole part 51 and the 1st hole part 12b are provided. The second hole portion 13a and the third hole portion 45c communicate with each other (see FIG. 2).

  The display device D is configured by the above-described units. Here, in the case of this example, the housing 40 is screwed to the display unit 10 with a screw S that passes through the third hole 45c as a penetrating portion formed in the annular portion 45a (heat radiating portion 45). It has a configuration. Specifically, as shown in FIG. 2, the screw portion of the screw S is a third hole portion 45 c of the annular portion 45 a, a fourth hole portion 51 of the heat transfer member 50, and a first hole portion of the circuit board 12. 12b and the second hole portion 13a of the case body 13 and further screwed into the screw threaded portion of the boss portion 14, the housing 40 has the heat transfer member 50 and the heat radiating portion 45 and the circuit. In a state of being compressed between the substrate 12 and the display unit 10, the screws are fixed to the display unit 10.

  As a result, when the display device D as a vehicle meter is operated by receiving power supply, the electronic device 12a including the control unit mounted (mounted) on the circuit board 12 (the conductive path) is used. The generated heat is configured to be transmitted to the heat radiating portion 45 via the circuit board 12 and the heat transfer member 50, and as a result, is dissipated into the atmosphere.

  Specifically, the heat generated from the plurality of electronic components 12a is stored in the circuit board 12 by being transmitted to the conductive path, for example, and the heat stored in the circuit board 12 is Through the heat transfer member 50 in contact with the substrate 12, the heat transfer member 50 is in contact with the heat transfer member 50 and is exposed to the heat radiating portion 45 exposed to the outside of the display device D, to the outside of the display device D (ie, in the atmosphere) Therefore, the heat dissipation efficiency of the heat generated from the electronic component 12a to the outside of the device (outside of the display device D) can be enhanced. Moreover, since the surface area of the heat radiating part 45 in contact with the air is increased by providing the annular hanging part 45b in the heat radiating part 45 as in this example, the heat radiation efficiency can be further increased.

  As described above, in the present embodiment, the display unit 10 having the display unit 11 and the circuit board 12 disposed on the side opposite to the viewer E side of the display unit 11 and the heat generation mounted on the circuit board 12 are accompanied. In the display device D including the electronic component 12a and the housing 40 that houses the display unit 10, the housing 40 has a wall portion 43 that has a hollow portion 43 provided on the side opposite to the viewer E side of the circuit board 12. 44 and the heat dissipating part 45 embedded in the cavity 43 are integrally formed, and the screw S penetrating the third hole 45c as a penetrating part formed in the heat dissipating part 45, The heat generated from the electronic component 12 a is fixed to the display unit 10 with screws, and is transmitted to the heat radiating portion 45 through the circuit board 12. A heat transfer member 50 is disposed between the circuit board 12 and the heat radiating portion 45.

  Therefore, since the heat generated from the electronic component 12a is radiated to the outside of the display device D (that is, in the atmosphere) through the circuit board 12, the heat transfer member 50, and the heat radiating portion 45, the heat generated from the electronic component 12a. It is possible to provide a display device that can increase the efficiency of heat radiation to the outside (outside of the display device D).

  In the present embodiment, the contact portion 49 of the wall portion 44 (second annular portion 44b) that contacts the heat radiating portion 45 (the outer peripheral surface of the second annular portion 47 and the outer peripheral surface of the annular hanging portion 45b) is As the distance from the circuit board 12 increases, the opening of the cavity 43 becomes narrower (inclined surface), so that the heat radiating part 45 is stably fixed and held on the wall 44 of the housing 40. Therefore, it is possible to provide a display device in which the heat radiating portion 45 is not likely to drop out of the device due to an unexpected external force.

Further, in the present embodiment, at the upper end portion of the first annular portion 46 in the heat radiating portion 45, when the display unit 10 and the housing 40 are fixed with screws, the heat radiating portion 45 prevents the heat radiating portion 45 from idling. As a result of the provision of the plurality of projections 48, there is no risk of the heat radiation part 45 dropping off due to unintentional external force, and the heat radiation part 45 idles together with the screw S when the screws are fixed. There is an advantage that the assembling workability when the housing 40 is assembled to the display unit 10 can be improved.

  In the present embodiment, an example in which the heat transfer member 50 is disposed between the circuit board 12 and the heat radiating portion 45 has been described. However, for example, the heat transfer member 50 is abolished and the heat radiating portion 45 (first annular shape) is disposed. Even when the portion 46) is brought into direct contact with the circuit board 12, the same effect as that of the above embodiment can be obtained.

  In the present embodiment, an example in which the display means 11 is an instrument display such as a liquid crystal display panel has been described. For example, the display means 11 is for an instrument having a pointer and a display unit such as a scale indicated by the pointer. It may be an analog instrument mainly composed of a display board and a motor (pointer driving means) mounted on the circuit board 12 so as to drive the pointer.

DESCRIPTION OF SYMBOLS 10 Display unit 11 Display means 12 Circuit board 12a Electronic component 20 Perspective panel 30 Frame member 40 Housing | casing 41 Bottom wall part 42 Side wall part 43 Cavity part 43a 1st cavity part 43b 2nd cavity part 44 Wall part 45 Heat radiation part 45a Annular part 45b Annular hanging part 45c Third hole (penetrating part)
46 1st annular part 47 2nd annular part 48 Projection part (idling prevention part)
50 Heat transfer member E Viewer S Screw

Claims (2)

A display unit having at least a display unit and a circuit board disposed on a side opposite to the viewer side of the display unit;
Electronic components with heat generation mounted on the circuit board;
In a display device comprising a housing that houses the display unit,
The casing is integrally formed with a wall portion having a hollow portion provided on the side opposite to the viewer side of the circuit board so as to contact the back surface of the circuit board, and a heat radiating portion embedded in the hollow portion. The screw is fixed to the display unit by a screw that penetrates the penetrating portion formed in the heat radiating portion, and the cavity portion is formed from an elastic body between the circuit board and the heat radiating portion. A heat transfer member
A display device, wherein heat generated from the electronic component is configured to be transmitted to the heat radiating portion via the circuit board and the heat transfer member . Abutment of the wall portion to contact with the heat radiation member, as the distance from the circuit board, according to claim 1 Symbol mounting opening width of the cavity is characterized in that has a shape such that the narrow Display device.

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