JP7395854B2 - display device - Google Patents

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 that require a large processing load generate a large amount of heat. Therefore, display devices have a metal heat dissipation component that covers the electronic components and a case that houses the heat dissipation components with the heat dissipation components exposed to the outside through an opening, thereby improving the heat dissipation performance of the electronic components. Measures are being taken.

Japanese Patent Application Publication No. 2017-151381

Nowadays, there is a tendency for displays to be required to be larger. Along with this, the amount of heat generated from electronic components such as graphic controllers also tends to increase. Furthermore, for example, when the display is a liquid crystal display, the backlight also increases as the display becomes larger, so the amount of heat generated from the backlight also increases.

In order to improve heat dissipation, it is conceivable to increase the size of the heat dissipation component described above. However, as the metal heat dissipation component becomes larger, there is a problem in that the weight of the entire display device increases. Additionally, as the weight of the display device increases, there is a problem in that vibration resistance against vibrations from a 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 properties and vibration resistance.

In order to solve the above-mentioned problems, a display device of the present disclosure includes a heating element that emits heat, a mounting stay that accommodates the heating element and can be attached to a mounting point, and a mounting stay that radiates the heat transmitted from the heating element. a case having a heat dissipation part, the case has a metal part made of metal having at least the mounting stay and the heat dissipation part, the metal part being one member, and the case having the heat dissipation part; a first surface having a thermal contact portion that makes thermal contact with the first surface ; an upper side of the first surface that is located vertically upward when attached to the attachment destination; and a lower side that opposes the upper side. , the mounting stay is provided on the upper side at a position that at least partially overlaps the thermal contact portion in the side direction of the upper side and the lower side.
Further, in order to solve the above-mentioned problems, the display device of the present disclosure includes a heating element that emits heat, a mounting stay that accommodates the heating element and can be attached to an attachment point, and a mounting stay that can absorb the heat transmitted from the heating element. a case having a heat radiating part that radiates heat; the case has a metal part made of metal having at least the mounting stay and the heat radiating part, and the metal part is thermally connected to the heating element. It has a first surface that contacts and a second surface that is an opposite surface to the first surface, and the heat radiation part is a radiation fin provided on the second surface.
Further, in order to solve the above-mentioned problems, the display device of the present disclosure includes a heating element that emits heat, a mounting stay that accommodates the heating element and can be attached to an attachment point, and a mounting stay that can absorb the heat transmitted from the heating element. a case having a heat radiating part that radiates heat, the case comprising at least a metal part made of metal having the mounting stay and the heat radiating part, and a part of the case other than the part formed by the metal part. , a resin part made of resin, and a display device having a front surface and a rear surface opposite to the front surface, further comprising a circuit board on which the heating element and the connector are mounted on the rear surface side, The resin portion has a connector protrusion hole that exposes the connector while covering the periphery of the connector in a direction connecting the front surface and the back surface, and the metal portion is arranged to extend from the rear side with respect to the resin portion. It has a protrusion hole that is attached and causes the connector protrusion hole to protrude from the metal part.

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

FIG. 1 is a configuration diagram of a display device that is an embodiment of the display device of the present disclosure, viewed from the front side. FIG. 2 is a configuration diagram of the display device in FIG. 1 viewed from the back side. A cross-sectional view taken along line III-III in FIG. 1. FIG. 3 is a perspective view showing the resin part of the case from the back side. FIG. 3 is a perspective view showing the metal part of the case from the back side. A cross-sectional view taken along line VI-VI in FIG. 2.

Embodiments of a display device of the present disclosure will be described based on the accompanying drawings. The display device according to the present disclosure is installed, for example, in a vehicle such as an automobile or a motorcycle, a ship, an agricultural machine, or a construction machine. In this embodiment, the display device of the present disclosure will be described using, as an example, a display device mounted in an instrument panel of a vehicle as a mounting destination.

FIG. 1 is a configuration diagram of a display device 1, which is an embodiment of the display device of the present disclosure, viewed from the front side.
FIG. 2 is a configuration diagram of the display device 1 of FIG. 1 viewed from the back side.
FIG. 3 is a sectional view taken along line III--III in FIG. 1.

In the following explanation, "front", "rear", "upper", "lower", "right", and "left" are defined as "Fr.", "left" in FIGS. 1 to 6. "Re.", "To.", "Bo.", "R", and "L". Note that the side of the display device 1 that is visually recognized by the user is referred to as the "front".

The display device 1 is installed in an instrument panel of a 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 in an internal space, and protects them from external shocks, dust, and the like. The case 10 has a substantially rectangular opening 11 in the front that exposes the display screen 41. Case 10 includes a resin part 60 and a metal part 70. Details of the resin part 60 and the metal part 70 will be described later.

The visor 20 is made of black or other light-shielding synthetic resin (for example, polypropylene resin). 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 includes a main body 21 and a visor plate 25. The main body 21 has an opening 22 having an opening surface that slopes downward and gradually away from the display screen 41 . The visor plate 25 is formed separately from the main body 21 and is arranged at the rear of the main body 21. The visor plate 25 covers unnecessary areas inside the case 10 and partitions the display screen 41 of the display unit 40 into a rectangular shape.

The cover 30 is made of 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 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 is disposed inside the case 10. 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 front glass substrates enclosing a liquid crystal layer. Transparent electrodes made of ITO (Indium Tin Oxide) or the like are formed on the pair of glass substrates. The display panel also includes a pair of front polarizing plates (polarizing filters) arranged to sandwich a pair of front glass substrates. The display panel is connected to the circuit board 50 via a flexible printed circuit (FPC) (not shown). The display panel is controlled by the control section 51 of the circuit board 50, so that a driving voltage is applied to the liquid crystal layer through the transparent electrode. As a result, the orientation of 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 includes a light source board and a light guide, and illuminates the display panel from behind. The light source board mounts a plurality of LEDs (Light Emitting Diodes), which are examples of light sources. The light source board is connected to the circuit board 50 via a flexible board such as an FPC. When supplied with a drive current, the LED emits light toward the light guide. 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 into a flat plate.

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

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

Next, the details of case 10 will be explained.

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 part 70 of the case 10 from the back surface 74b side.
FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 2.

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

The back opening 63 is formed in the base surface 62, mainly in a region where the metal part 70 is arranged. The connector protrusion hole 64 has a cylindrical shape and covers the periphery of the connector 52 in the front-rear direction (direction connecting the front and back surfaces of the display device 1) while exposing the terminal 53 of the connector 52.

The metal part 70 is made of a metal (eg, magnesium alloy, aluminum alloy) that has excellent thermal conductivity and rigidity. The metal part 70 is formed from one continuous member. The metal part 70 is attached to the resin part 60 with screws from the rear so as to overlap the back surface 62b of the resin part 60. Furthermore, the case 10 is not formed by attaching a metal part, which is a combination of a plurality of metal members, to the resin part 60, but is formed by combining a metal part 70 as a single component to the resin part 60. be done.

The metal part 70 has a base surface 74, a thermal contact part 75, a radiation fin 76, a protrusion hole 77, an upper mounting stay 78, and a lower mounting stay 79.

The base surface 74 is a flat member having a substantially trapezoidal shape and having an upper side 71 and a lower side 72. The upper side 71 is the side of the base surface 74 located on the upper side in the vertical (gravity) direction when the display device 1 is attached to a vehicle. The lower side 72 is a side of the base surface 74 facing the upper side 71 and located vertically lower than the upper side 71 when attached to a vehicle. The base surface 74 has a plurality of screw holes 80 for screwing into the resin part 60.

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

The heat radiation fins 76 (heat radiation section) radiate heat transmitted from the control section 51. The radiation fins 76 are a plurality of rib-like members provided on the back surface 74b (second surface) with the thermal contact portion 75 approximately in the center. The radiation fins 76 extend in the vertical direction and protrude rearward from the back surface 74b. In order to increase the surface area of the base surface 74, it is preferable that a large number of radiation fins 76 be provided at positions where they can be formed.

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

The upper mounting stay 78 and the lower mounting stay 79 are used to mount the display device 1 into an instrument panel of a vehicle. The upper mounting stay 78 is provided on the upper side 71 of the base surface 74 at a position where at least a portion thereof overlaps with the thermal contact portion 75 in the side direction (horizontal direction) of the upper side 71 and the lower side 72. 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 part 70 forms at least the upper mounting stay 78 and the heat radiation fin 76, and the resin part 60 forms the part other than the part formed by the metal part 70. Furthermore, at a location where the case 10 contacts the circuit board 50, the resin portion 60 is arranged closer to the circuit board 50 than the metal portion 70 is. That is, the case 10 is formed so that the metal part 70 does not come into contact with the circuit board 50. For example, the contact point 15 between the case 10 and the circuit board 50 in FIG. 3 overlaps the position of the metal part 70 in the rear view, but the screw hole 66 of the resin part 60 covers the screw hole 80 of the metal part 70 in the front view. It is formed like this. Thereby, the resin part 60 is arranged between the metal part 70 and the circuit board 50.

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

Therefore, the display device 1 can achieve both heat dissipation and vibration resistance. Further, although the metal portion 70 is made of a metal material that is more expensive than a resin material, since the display device 1 has a limited range of metal materials, an increase in material costs can also be suppressed.

Further, the heat of the control section 51 transmitted via the thermal contact section 75 flows upward in the vertical direction. In the display device 1, the upper mounting stay 78 is disposed directly above the thermal contact portion 75, which is continuous with the base surface 74 on which the thermal contact portion 75 is formed. Thereby, the display device 1 allows the heat from the thermal contact portion 75 to reach the upper mounting stay 78, and can efficiently radiate the heat from the upper mounting stay 78. That is, the upper mounting stay 78 functions as a heat radiation section. Thereby, the display device 1 can further improve heat dissipation.

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

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

For example, the shape of the metal part 70 is one example, and other shapes may be used as long as at least the heat radiation fins 76 (heat radiation part) and the upper mounting stay 78 (mounting stay) are formed.

As a countermeasure against static electricity, the circuit board 50 and the metal part 70 may come into contact with each other intentionally. Although the example in which the heating element is the control unit 51 has been described, it may be another electronic component.

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 side 51 Control unit (heating element)
52 Connector 53 Terminal 60 Resin portion 62 Base surface 62b Rear surface 63 Rear opening 64 Connector protrusion hole 65 Side wall 66 Screw hole 70 Metal portion 71 Upper side 72 Lower side 74 Base surface 74a Front surface 74b Rear surface 75 Thermal contact section 76 Heat dissipation fin (heat dissipation section)
77 Hole for protrusion hole 78 Upper mounting stay (mounting stay)
79 Lower mounting stay 80 Screw hole 90 Heat conductive sheet

Claims (3)

A heating element that emits heat;
a case having a mounting stay that accommodates the heating element and can be attached to an attachment point; and a heat radiating part that radiates the heat transmitted from the heating element;
The case has a metal part made of metal having at least the mounting stay and the heat radiation part,
The metal part is one member, and has a first surface having a thermal contact part that makes thermal contact with the heat generating element , and a first surface located vertically upward when attached to the attachment destination. having an upper side and a lower side opposite to the upper side,
In the display device, the mounting stay is provided on the upper side at a position that at least partially overlaps the thermal contact portion in the side direction of the upper side and the lower side. A heating element that emits heat;
a case having a mounting stay that accommodates the heating element and can be attached to an attachment point; and a heat radiating part that radiates the heat transmitted from the heating element;
The case has a metal part made of metal having at least the mounting stay and the heat radiation part,
The metal part has a first surface that is in thermal contact with the heating element, and a second surface that is opposite to the first surface,
In the display device, the heat dissipation section is a heat dissipation fin provided on the second surface. A heating element that emits heat;
a case having a mounting stay that accommodates the heating element and can be attached to an attachment point; and a heat radiating part that radiates the heat transmitted from the heating element;
The case has a metal part made of metal having at least the mounting stay and the heat dissipation part, and a resin part made of resin forming a part of the case other than the part formed by the metal part,
A display device having a front surface and a back surface opposite to the front surface,
further comprising a circuit board on which the heating element and the connector are mounted on the back side,
The resin part has a connector protrusion hole that exposes the connector while covering the periphery of the connector in a direction connecting the front surface and the back surface,
The metal part is attached to the resin part from the back side, and has a protrusion hole that allows the connector protrusion hole to protrude from the metal part.

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