JP2021002562A - Display device - Google Patents

Abstract

To provide a display device having heat dissipation and vibration resistance.SOLUTION: A display device 1 includes a control portion 51 that emits heat, and a case 10 having an upper mounting stay 78 that accommodates the control portion 51 and can be attached to the mounting destination, and a heat radiating fin 76 that dissipates heat transmitted from the control portion 51. The case 10 includes a metal portion 70 made of metal having at least the upper mounting stay 78 and the heat radiating fin 76. The case further includes a resin portion 60 made of resin, and forming a portion other than the portion formed by the metal portion 70 in the case 10.SELECTED DRAWING: Figure 2

Description

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

The display device includes a display and a circuit board for controlling the display. The circuit board is equipped with electronic components such as a graphic controller for display control. Electronic components with a large processing load generate a large amount of heat. Therefore, the display device has a metal heat-dissipating component that covers the electronic component and a case that exposes the heat-dissipating component to the outside from the opening and accommodates the heat-dissipating component to improve the heat-dissipating property of the electronic component. Measures are being taken.

Japanese Unexamined Patent Publication No. 2017-151381

Today, displays tend to be larger. Along with this, the amount of heat generated from electronic components such as graphic controllers tends to increase. Further, for example, when the display is a liquid crystal display, the amount of heat generated from the backlight also increases because the backlight increases as the size increases.

In order to improve heat dissipation, it is conceivable to increase the size of the heat dissipation parts described above. However, when the metal heat radiating component becomes large, there is a problem that the weight of the entire display device increases. Further, as the weight of the display device increases, there is a problem that the vibration resistance against vibration from the vehicle decreases.

The present disclosure has been made in consideration of such circumstances, and an object of the present disclosure is to provide a display device having heat dissipation and vibration resistance.

In order to solve the above-mentioned problems, the display device of the present disclosure accommodates a heating element that generates heat, a mounting stay that accommodates the heating element and can be attached to a mounting destination, and dissipates the heat transmitted from the heating element. It has a case having a heat radiating portion, and the case has at least a metal portion made of a metal having the mounting stay and the heat radiating portion.

The display device of the present disclosure can have heat dissipation and vibration resistance.

The block diagram which saw the display device which is the embodiment of the display device of this disclosure from the front side. The block diagram which looked at the display device of FIG. 1 from the back side. Sectional drawing along line III-III of FIG. The perspective view which shows the resin part of a case from the back side. The perspective view which shows the metal part of a case from the back side. FIG. 2 is a cross-sectional view taken along the line VI-VI of FIG.

An embodiment of the display device of the present disclosure will be described with reference to the accompanying drawings. The display device according to the present disclosure is mounted on, for example, vehicles such as automobiles and motorcycles, ships, agricultural machines, and construction machines. In the present embodiment, as an example, the display device of the present disclosure will be described using a display device mounted in the instrument panel of the vehicle as a mounting destination.

FIG. 1 is a configuration diagram of a display device 1 according to an embodiment of the display device of the present disclosure as viewed from the front side.
FIG. 2 is a configuration diagram of the display device 1 of FIG. 1 as viewed from the rear side.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

In the following description, "front (front)", "rear (rear)", "top", "bottom", "right", and "left" are defined as "Fr.", "Fr." in FIGS. 1 to 6. Follow "Re.", "To.", "Bo.", "R", and "L". The side where the display device 1 is visually recognized by the user is defined as "front".

The display device 1 is mounted in the instrument panel of the vehicle. The display device 1 mainly includes a case 10, a visor 20, a cover 30, a display unit 40, and a circuit board 50.

The case 10 accommodates the display unit 40 and the circuit board 50 from behind them in the internal space, and protects them from external impact, dust, and the like. The case 10 has a substantially quadrangular opening 11 in front that exposes the display screen 41. The case 10 has a resin portion 60 and a metal portion 70. Details of the resin portion 60 and the metal portion 70 will be described later.

The visor 20 is made of a light-shielding synthetic resin (for example, polypropylene resin) such as black. The visor 20 is attached to the resin portion 60 of the case 10 from the front via a hook or the like, and also functions as a case in front of the display device 1. The visor 20 has a main body 21 and a visor plate 25. The main body 21 has an opening 22 having an opening surface that is inclined downward and gradually away from the display screen 41. The visor plate 25 is formed separately from the main body 21 and is arranged behind the main body 21. The visor plate 25 covers an unnecessary area inside the case 10 and divides the display screen 41 of the display unit 40 into a rectangle.

The cover 30 is made of a translucent inorganic glass or resin (for example, polymethyl methacrylate resin (PMMA)). The cover 30 covers the opening 22 of the main body 21 from the front, and protects the display unit 40 and the circuit board 50 inside the case 10 from dust and the like.

The display unit 40 is supported by the circuit board 50 and the case 10 and arranged inside the case 10. The display unit 40 includes a display panel and a backlight unit.

The display panel is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel. The display panel is, for example, a large panel of 12 inches or more. The display panel has a pair of surface glass substrates that enclose the liquid crystal layer. A transparent electrode is formed on the pair of glass substrates by ITO (Indium Tin Oxide) or the like. Further, the display panel has a pair of surface polarizing plates (polarizing filters) arranged so as to sandwich the pair of surface glass substrates. The display panel is connected to the circuit board 50 via a flexible printed circuit board (FPC (Flexible Printed Circuits)) (not shown). The display panel is controlled by the control unit 51 of the circuit board 50, so that a drive voltage is applied to the liquid crystal layer via the transparent electrodes. As a result, the orientation of the liquid crystal molecules in the liquid crystal layer is controlled, and the transmittance of each pixel of the display panel changes, so that the display panel displays an image.

The backlight unit is provided behind the display panel. The backlight unit comprises a light source substrate and a light guide body, and illuminates the display panel from the rear. A plurality of LEDs (Light Emitting Diodes), which are an example of a light source, are mounted on the light source substrate. The light source substrate is connected to the circuit board 50 via a flexible substrate such as an FPC. When the drive current is supplied, the LED emits light toward the light guide body. The light guide guides the light emitted by the LED toward the display panel. The light guide is a transparent resin (for example, PMMA) formed in a flat plate shape.

The circuit board 50 is supported by the case 10 and is arranged inside the case 10 behind the display unit 40. The circuit board 50 mainly has a control unit 51 for controlling the display unit 40. The circuit board 50 mounts the control unit 51 on the back surface 50b (the back surface side of the display device 1). The control unit 51 is a so-called GDC (Graphics Display Controller), which is a heating element that emits relatively high heat. The control unit 51 has a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and executes a predetermined arithmetic process according to a program written in the ROM, for example. For example, the control unit 51 acquires vehicle speed, engine speed, various vehicle information, navigation information, and the like from the vehicle's ECU (Electronic Control Unit) via various sensors and the like. The control unit 51 causes the display unit 40 to display the information based on the acquired information.

The circuit board 50 has a plurality of connectors 52 on the back surface 50b. The connector 52 penetrates and exposes the case 10 and connects to a cable (not shown) extending from the vehicle.

Next, the details of the case 10 will be described.

FIG. 4 is a perspective view showing the resin portion 60 of the case 10 from the back surface 62b side.
FIG. 5 is a perspective view showing the metal portion 70 of the case 10 from the back surface 74b side.
FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG.

The resin portion 60 has a box shape including a base surface 62 and a side wall 65 rising forward from the base surface 62, and forms a substantially outer shape of the case 10. The resin portion 60 is made of a resin such as black (for example, polypropylene resin). The base surface 62 has a back opening 63 and a protruding hole 64 for a connector.

The back opening 63 is a base surface 62 and is formed mainly in a region where the metal portion 70 is arranged. The protruding hole 64 for a connector has a tubular shape by exposing the terminal 53 of the connector 52 while covering the periphery of the connector 52 in the front-rear direction (the direction connecting the front surface and the back surface of the display device 1).

The metal portion 70 is made of a metal having excellent thermal conductivity and rigidity (for example, magnesium alloy, aluminum alloy). The metal portion 70 is formed of one continuous member. The metal portion 70 is attached to the resin portion 60 with screws from the rear so as to overlap the back surface 62b of the resin portion 60. Further, the case 10 is not formed by attaching a metal portion in which a plurality of metal members are combined to the resin portion 60, but is formed by combining the metal portion 70 as one component into the resin portion 60. Will be done.

The metal portion 70 has a base surface 74, a thermal contact portion 75, heat radiation fins 76, a hole for protruding holes 77, an upper mounting stay 78, and a lower mounting stay 79.

The base surface 74 is a flat plate-shaped member having a substantially trapezoidal shape having an upper side 71 and a lower side 72. The upper side 71 is a side of the base surface 74 located on the upper side in the vertical (gravity) direction when the display device 1 is attached to the vehicle. The lower side 72 is a side of a base surface 74 facing the upper side 71, which is located on the lower side in the vertical direction with respect to the upper side 71 when mounted on a vehicle. The base surface 74 has a plurality of screw holes 80 for being screwed to the resin portion 60.

The thermal contact portion 75 is a portion provided on the front surface 74a (first surface) of the base surface 74 and in thermal contact with the control unit 51 of the circuit board 50. As shown in FIG. 3, the heat contact unit 75 contacts the control unit 51 via the heat conductive sheet 90. The heat conductive sheet 90 is provided to efficiently transfer the heat of the control unit 51 to the metal unit 70. The heat conductive sheet 90 is made of, for example, a flexible, good heat conductive silicone, acrylic, polyolefin, or the like having excellent adhesion.

The heat dissipation fin 76 (heat dissipation unit) dissipates heat transmitted from the control unit 51. The heat radiating fin 76 is a plurality of rib-shaped members provided on the back surface 74b (second surface) with the heat contact portion 75 substantially at the center. The heat radiating fin 76 extends in the vertical direction and projects rearward from the back surface 74b. In order to increase the surface area of the base surface 74, it is preferable that the heat radiation fins 76 are provided in large numbers at positions where they can be formed.

The protrusion hole 77 is formed at a position corresponding to the connector protrusion 64 of the resin portion 60. The protrusion hole 77 projects the connector protrusion 64 rearward from the back surface 74b of the metal portion 70. As a result, the protruding hole hole 77 is located between the metal portion 70 and the connector 52, and the metal portion 70 is not in contact with the connector 52.

The upper mounting stay 78 and the lower mounting stay 79 are used for mounting the display device 1 in the instrument panel of the vehicle to which the display device 1 is mounted. The upper mounting stay 78 is provided on the upper side 71 of the base surface 74 at a position where at least a part of the upper side 71 and the lower side 72 overlaps the thermal contact portion 75 in the side direction (left-right direction). The two lower mounting stays 79 are provided at both ends of the lower side 72 in the left-right direction.

In the case 10 formed in this way, the metal portion 70 forms at least the upper mounting stay 78 and the heat radiation fin 76, and the resin portion 60 forms a portion other than the portion formed by the metal portion 70. Further, the resin portion 60 is arranged closer to the circuit board 50 than the metal portion 70 at the position where the case 10 comes into contact with the circuit board 50. That is, the case 10 is formed so that the metal portion 70 does not come into contact with the circuit board 50. For example, the contact portion 15 between the case 10 and the circuit board 50 in FIG. 3 overlaps the position of the metal portion 70 in the rear view, but the screw hole 66 of the resin portion 60 covers the screw hole 80 of the metal portion 70 in the front view. Is formed like this. As a result, the resin portion 60 is arranged between the metal portion 70 and the circuit board 50.

In such a display device 1, in the case 10, the heat radiation fin 76, the upper mounting stay 78, and the lower mounting stay 79 are formed of the metal portion 70, and the other portions are formed of the resin portion 60. As a result, the display device 1 efficiently dissipates the heat transmitted from the control unit 51 by the heat radiating fins 76, and is firmly attached to the vehicle via the mounting stays 78 and 79 made of rigid metal. Further, since the display device 1 suppresses the range of the case 10 made of a metal material, it is possible to suppress an excessive increase in the weight of the case 10. The display device 1 can suppress an increase in weight and is firmly attached by metal attachment stays 78 and 79. Therefore, the display device 1 suppresses a decrease in mounting strength to the vehicle and also suppresses a decrease in vibration resistance.

Therefore, the display device 1 can achieve both heat dissipation and vibration resistance. Further, although a metal material that is more expensive than the resin material is used for the metal portion 70, since the display device 1 limits the range of the metal material, an increase in material cost can be suppressed.

Further, the heat of the control unit 51 transmitted through the heat contact unit 75 flows upward in the vertical direction. In the display device 1, the upper mounting stay 78 is arranged directly above the thermal contact portion 75, which is continuous with the base surface 74 on which the thermal contact portion 75 is formed. As a result, the display device 1 allows the heat from the thermal contact portion 75 to reach the upper mounting stay 78 and efficiently dissipate heat from the upper mounting stay 78. That is, the upper mounting stay 78 functions as a heat radiating portion. As a result, the display device 1 can further improve heat dissipation.

Further, with the provision of the metal portion 70, the contact surface may be scraped, scratched or dusted due to contact between the circuit board 50 itself or the connector 52 and the metal portion 70 due to vibration or the like. On the other hand, in the display device 1, the case 10 is configured so that the metal portion 70 and the circuit board 50 are not in contact with each other. As a result, the resin portion 60, which is a softer material than the metal portion 70, comes into contact with the circuit board 50, and scratches and dusting can be reduced as compared with the contact with the metal portion 70. Further, since the circuit board 50 and the metal portion 70 are not in contact with each other, the display device 1 can suppress unnecessary conduction between the circuit board 50 and the metal portion 70.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, the shape of the metal portion 70 is an example, and may have another shape as long as the heat radiating fin 76 (heat radiating portion) and the upper mounting stay 78 (mounting stay) are formed at least.

The circuit board 50 and the metal portion 70 may intentionally come into contact with each other as a measure against static electricity. Although the example in which the heating element is the control unit 51 has been described, other electronic components may be used.

1 Display device 10 Case 11 Opening 15 Contact point 20 Visor 21 Main body 22 Opening 25 Visor plate 30 Cover 40 Display unit 41 Display screen 50 Circuit board 50b Back 51 Control unit (heating element)
52 Connector 53 Terminal 60 Resin part 62 Base surface 62b Back side 63 Back side opening 64 Connector protrusion hole 65 Side wall 66 Screw hole 70 Metal part 71 Upper side 72 Lower side 74 Base surface 74a Front side 74b Back side 75 Thermal contact part 76 Heat dissipation fin (heat dissipation part)
77 Hole for protruding hole 78 Top mounting stay (mounting stay)
79 Bottom mounting stay 80 Screw hole 90 Heat conductive sheet

Claims (6)

A heating element that emits heat and
It has a case having a mounting stay that accommodates the heating element and can be attached to the mounting destination, and a heat radiating portion that dissipates the heat transmitted from the heating element.
The case is a display device having at least a metal portion made of a metal having the mounting stay and the heat radiating portion. The display device according to claim 1, wherein the case further includes a resin portion made of a resin, which forms a portion other than the portion formed by the metal portion in the case. The display device has a front surface and a back surface opposite to the front surface.
The display device according to claim 2, wherein the metal portion is attached to the resin portion from the back surface side. A circuit board for mounting the heating element and the connector on the back side thereof is further provided.
The resin portion has a connector protruding hole that exposes the connector while covering the periphery of the connector in the direction connecting the front surface and the back surface.
The display device according to claim 3, wherein the metal portion has a protrusion hole for projecting the connector protrusion hole from the metal portion. The metal portion is a member, and has a first surface having a thermal contact portion that makes thermal contact with the heating element, and the first surface located on the upper side in the vertical direction when the display device is attached to the attachment destination. It has an upper side on one surface and a lower side facing the upper side.
The display device according to claim 1, wherein the mounting stay is provided at a position where at least a part of the upper side overlaps the thermal contact portion in the side directions of the upper side and the lower side. The metal portion has a first surface that is in thermal contact with the heating element and a second surface that is opposite to the first surface.
The display device according to claim 1, wherein the heat radiating portion is a heat radiating fin provided on the second surface.

Images