JP2021196522A - Display - Google Patents

Abstract

To provide a display that has excellent measures against heat.SOLUTION: A display of the present embodiment comprises: a display unit 30; a case 10 that is fixed to a fixation destination, has a front face 12 that exposes the display unit 30, a back face 13 that faces substantially the opposite side of the front face 12, and a side face 14 that connects the front face 12 and the back face 13 with each other, and forms an exposure part 18 that is exposed to the fixation destination at least at part of the back face 13 or the side face 14; and a metal film 25 that is formed on at least part of the exposure part 18.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a display device mounted on a vehicle or the like.

Conventionally, a display device on a dashboard and supported in front of a windshield has been known. Such a display device is arranged so that not only the front surface of the case member but also the side surface and the back surface are exposed and can be visually recognized by the user.

Japanese Unexamined Patent Publication No. 2019-023701

The above-mentioned case member tends to be heated to a high temperature by being irradiated with the sunlight transmitted through the windshield. Therefore, the heat of the case member is transferred to the internal electronic component, and the electronic component may be deteriorated.

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 excellent heat countermeasures.

In order to solve the above-mentioned problems, the display device of the present disclosure includes a display unit, a front surface fixed to a fixing destination to expose the display unit, a back surface facing substantially opposite to the front surface, and the front surface. A case member having a side surface connecting the back surface and forming an exposed portion exposed to the fixing destination on the back surface or at least a part of the side surface, and formed on at least a part of the exposed portion. It is equipped with a metal film.

In the display device of the present disclosure, excellent heat countermeasures can be taken.

A perspective view of a display device according to an embodiment of the display device of the present disclosure as viewed from the front side. A perspective view of a display device according to an embodiment of the display device of the present disclosure as viewed from the rear side. A vertical sectional view taken along the line III-III of FIG. Enlarged view of Region IV in FIG.

An embodiment of the display device of the present disclosure will be described with reference to the accompanying drawings. The display device of the present disclosure may be mounted on a vehicle such as an automobile or a two-wheeled vehicle, a ship, an agricultural machine, or a construction machine.

FIG. 1 is a perspective view of the display device 1 according to the embodiment of the display device of the present disclosure as viewed from the front surface 12 side.
FIG. 2 is a perspective view of the display device 1 according to the embodiment of the display device of the present disclosure as viewed from the back surface 13 side.
FIG. 3 is a vertical 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 3. Follow "Re.", "To.", "Bo.", "R", and "L".

The display device 1 is fixed to the column tube 2 of the vehicle by using screws or the like. The column tube 2 is a tubular member that includes the steering shaft 3. The column tube 2 is further covered by the column cover 4 and shielded from the user.

The display device 1 mainly includes a case 10, a display unit 30, a circuit board 40, and a protective cover 50.

The case 10 (case member) houses the display unit 30, the circuit board 40, and the like, and protects them from external impacts, dust, and the like. The case 10 has a structure of being fixed to a vehicle as a fixing destination by being formed in a substantially L-shaped cross section having a vertical portion and a horizontal portion. Specifically, the case 10 (display device 1) is arranged in a state where the horizontal portion is fixed in the column cover 4 and the vertical portion stands up from the opening 4a of the column cover 4.

The case 10 has a front surface 12, a back surface 13, and a side surface 14. The front surface 12 has a front side opening 10a that exposes the display screen 35 (display unit) of the display unit 30 to the front side. The back surface 13 is a surface facing substantially opposite to the front surface 12. The back surface 13 may also include the surface of a horizontal portion. The side surface 14 is a surface orthogonal to the front surface 12 and the back surface 13, and connects the front surface 12 and the back surface 13. In the case 10, most of the front surface 12, the back surface 13 and the side surface 14 (at least a part of the back surface 13 and the side surface 14) are exposed to the vehicle as a fixing destination, and these exposed parts are visible to the user. There is an exposed portion 18. The detailed configuration of the case 10 will be described later.

The display unit 30 (display unit) includes a liquid crystal display element and a light source. The liquid crystal display element is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel formed by enclosing liquid crystal molecules between a pair of glass substrates. For example, the lower end 30b of the liquid crystal display element is provided with a plurality of electrode terminals that are electrically connected to one end of the flexible printed substrate 33. The other end of the flexible printed circuit board 33 extends horizontally rearward from the lower end 30b of the display unit 30 and connects to the circuit board 40.

The light source is, for example, an LED (Light Emitting Diode) provided at the lower end 30b of the display unit 30 and illuminating the liquid crystal display element. Further, the display unit 30 has a light guide plate for spreading the light of the light source over the entire surface of the liquid crystal display element, a reflector provided on the back surface of the light guide plate, and a diffusion plate provided on the front surface of the light guide plate. That is, the display unit 30 in the present embodiment has a so-called edge light type backlight unit.

The circuit board 40 is arranged in the case 10 (horizontal portion 17) and is fixed to the case 10 with screws or the like. The circuit board 40 mainly has a control unit for controlling the display unit 30. The control unit has a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and for example, executes a predetermined arithmetic process according to a program written in the ROM. For example, the control unit acquires vehicle speed, engine speed, various vehicle information, navigation information, etc. from the vehicle's ECU (Electronic Control Unit) via various sensors and the like. The control unit causes the display unit 30 to display the information based on the acquired information.

The protective cover 50 is a translucent plate-shaped member (for example, inorganic glass, polycarbonate resin, PMMA resin). The protective cover 50 protects the display unit 30 and the circuit board 40 inside the case 10 from dust and the like by covering the front opening 10a of the case 10. The protective cover 50 is adhered to the front surface 30a of the display unit 30 by an opticarboning with a translucent adhesive. The translucent adhesive is a transparent resin material (for example, silicone-based, urethane-based, or acrylic-based resin) having a refractive index substantially equal to that of the protective cover 50.

Next, the detailed configuration of the case 10 will be described.

FIG. 4 is an enlarged view of region IV of case 10 of FIG.

The case 10 has a metal case 15 and a resin case 21. The metal case 15 and the resin case 21 are integrally molded products integrally formed by insert molding.

The metal case 15 is made of metal (for example, magnesium). The metal case 15 has a vertical portion 16 and a horizontal portion 17, and has a substantially L-shaped cross section.

The vertical portion 16 is a substantially quadrangular box-shaped member facing in the front-rear direction and opening forward, and accommodates the display unit 30 in the internal space. The horizontal portion 17 is a substantially quadrangular box-shaped member that extends horizontally from the lower end of the vertical portion 16 to the rear and faces vertically and opens downward, and accommodates the circuit board 40 in the internal space. The opening of the horizontal portion 17 is covered by the bottom cover 11. The bottom cover 11 is made of sheet metal (for example, an electrogalvanized steel sheet (SECC)) and protects the circuit board 40 housed in the horizontal portion 17. The horizontal portion 17 is also used to fix the display device 1 to the column tube 2 of the vehicle with screws or the like.

The resin case 21 is made of a synthetic resin containing carbon black (for example, polycarbonate resin or ABS resin). The resin case 21 is a region of the metal case 15 that is visible to the user at least when mounted on a vehicle, and covers a region that may become hot due to sunlight. Specifically, the resin case 21 covers a region of the upper surface 17a of the vertical portion 16 and the horizontal portion 17 that may be visually recognized from the opening 4a of the column cover 4. That is, the region of these resin cases 21 becomes the exposed portion 18.

On the other hand, since most of the horizontal portion 17 is housed inside the column cover 4, the resin case 21 is not provided in these portions, and the metal case 15 is exposed. Further, when the horizontal portion 17 is exposed from the column cover 4, the resin case 21 may also be provided on the exposed horizontal portion 17. That is, the user can only see and touch the resin case 21, and cannot see and touch the metal case 15.

The case 10 has a metal film 25 for making the case 10 heat-shielding on the surface of the entire region of the exposed portion 18 described above. The metal film 25 is made of a material that mainly transmits (partially reflects) visible light rays and mainly reflects (partially transmits) near infrared rays, which is one of the main components of sunlight (heat radiation). .. The metal film 25 is preferably transparent (has a transmittance), has a transmittance of 50% to 100% for visible light, and has a transmittance of 0% to 30% for near infrared rays. When the transmittance of visible light of the metal film 25 is 50% or less, the metal color of the metal film 25 itself becomes conspicuous, and the color of the underlying case 10 becomes difficult to see. When the transmittance of the near-infrared rays of the metal film 25 is 30% or more, the metal film 25 absorbs the sun's rays and transfers heat, which causes a problem that the temperature of the case 10 and its inside becomes high. The metal film 25 is formed of, for example, indium tin oxide (ITO), tin antimony oxide (ATO), tin phosphate (AZO), lanthanum hexaboride (LaB6), tungsten cesium oxide (CsWO), a silver alloy, or the like. ..

The metal film 25 may be formed directly on the surface of the resin case 21, for example, or may be formed via a film. Further, the metal film 25 is formed by a dry coating method such as a vacuum deposition method, a CVD (Chemical Vapor Deposition) method, a sputtering method, etc., which directly forms metal fine particles as a film, rather than a wet coating method using a binder resin. Is preferable. The wet coating method is a film in which metal fine particles are scattered in a binder resin, and while repeating innumerable reflections in the film, near infrared rays are absorbed as heat and transmitted to the inside of the case 10. Therefore, by using the dry coating method, the metal film 25 can reflect near infrared rays with almost no absorption and suppress heat transfer to the inside of the case 10. Further, the metal film 25 using the dry coating method can obtain a reflection effect by the metal fine particles as compared with the case of using the wet coating method, and can further impart gloss to the case 10.

By forming a metal film 25 on the exposed portion 18 of the case 10, such a display device 1 can take excellent heat countermeasures. That is, the display device 1 is arranged on the column cover 4 (dashboard) and is used in an environment where the sun rays transmitted through the windshield of the vehicle are irradiated. Therefore, the back surface 13 and the side surface 14 of the case 10 facing the windshield become hot. The case 10 (resin case 21) is often formed in black, which is inconspicuous when reflected on the windshield and is not easily discolored by heat or ultraviolet rays, and particularly absorbs heat. Further, in order to improve the appearance of the display device 1, when carbon black is contained, the temperature tends to be high because it has a characteristic of easily absorbing near infrared rays which are the main components of the sun's rays.

Further, when the temperature of the case 10 becomes high, heat is transferred to the electronic parts inside the case 10, which may cause deterioration or failure of the electronic parts. In particular, the TFT type liquid crystal panel is easily affected by heat, and there is a risk of deterioration or failure due to a temperature higher than the heat resistant temperature.

On the other hand, in the display device 1 in the present embodiment, the metal film 25 is formed on the exposed portion 18 of the case 10. The metal film 25 reflects near infrared rays without mainly transmitting them. Therefore, as compared with the case where the metal film 25 is not provided, the exposed portion 18 is less likely to be heated to a high temperature by the sun's rays, and the influence of heat on the electronic components inside the case 10 can be reduced. Further, the display device 1 can also dissipate heat without insulating the heat transmitted from the internal electronic components by the metal film 25.

Further, since the metal film 25 mainly transmits visible light, the user is made to visually recognize the resin case 21 arranged inside the metal film 25. As a result, the display device 1 allows the user to visually recognize the color of the resin case 21, and the design can be maintained. For example, when the resin case 21 is made of a resin containing carbon black, the gloss of the metal film 25 is added to the resin case 21, so that the user can visually recognize the high gloss piano black tone. .. As a result, the display device 1 can improve the commercial value in terms of appearance.

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 case 10 in which the metal film 25 is formed is an example, and the metal film 25 may be formed on the surface of the case of any shape and material (metal or the like).

Further, although the example in which the metal film 25 is formed on the back surface 13 and the side surface 14 of the exposed portion 18, the example may be described, but the metal film 25 may be formed only on a part of these regions, or only on the back surface 13 or the side surface 14. It may be formed. For example, by forming only on the side surface 14, the manufacturing cost of the display device 1 can be reduced, and unnecessary images such as structures (vents, etc.) on the dashboard that the user does not want to see on the back surface 13 can be displayed. It is possible to avoid the occurrence of congestion.

1 Display device 2 Column tube 3 Steering shaft 4 Column cover 4a Opening 10 Case 10a Front opening 11 Bottom cover 12 Front 13 Back 14 Side 15 Metal case 16 Vertical 17 Horizontal 17a Top 18 Exposed 21 Resin case 25 Metal film 30 Display Unit 30a Front 30b End 33 Flexible printed circuit board 35 Display screen 40 Circuit board 50 Protective cover

Claims (6)

Display and
It has a front surface fixed to a fixing destination to expose the display unit, a back surface facing substantially opposite to the front surface, and a side surface connecting the front surface and the back surface, and at least the back surface or the side surface. A case member that partially forms an exposed portion exposed to the fixing destination,
A display device including a metal film formed on at least a part of the exposed portion. The display device according to claim 1, wherein the metal film is made of a material that transmits visible light and reflects near infrared rays. The display device according to claim 2, wherein the metal film has a transmittance of 50% to 100% for the visible light and 0% to 30% for the transmittance of the near infrared rays. The display device according to claim 2, wherein the case member is made of a resin containing carbon black. The display device according to claim 1, wherein the metal film is formed in the entire region of the exposed portion. The display device according to claim 1, wherein the metal film is formed only on the side surface of the exposed portion.

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