JP2021173967A - Display device - Google Patents

Abstract

To provide a display device that can maintain the external appearance suitably.SOLUTION: A display device according to an embodiment includes an inner case 15 formed of a first material and an outer case 21 formed of a second material whose linear expansion rate is higher than the first material and formed integrally with the inner case 15. One of the inner case 15 and the outer case 21 includes concave parts 19 and 20 that are concave in an opposing direction on the opposing surfaces, and the other of the inner case 15 and the outer case 21 includes convex parts 25 and 26 that are fitted to the concave parts 19 and 20 on the opposing surfaces. The convex parts 25 and 26 have, on the side of ends 25b and 26b of the convex parts 25 and 26, a part whose length in the width direction that is a direction approximately orthogonal to the opposing direction is larger than the length of bottoms 25c and 26c in the width direction.SELECTED DRAWING: Figure 5

Description

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

In order to protect a display unit including a display, a light source, or the like, a display device having a metal case member for holding and fixing the display unit is known. The metal case member becomes hot due to the heat of irradiation from sunlight. Therefore, the metal case member is housed and fixed in the resin case forming the outer shell of the display device, so that the user is prevented from directly touching the case member.

Japanese Unexamined Patent Publication No. 2019-023701

A screw is formed by joining a metal case member and a resin case member face-to-face with an adhesive or insert molding (a molding method in which a metal case member is placed in a mold and resin molding is performed). The display device can be made thinner than the case of using the above. However, when the surfaces are bonded to each other, the amount of elongation differs due to the difference in the coefficient of linear expansion between the metal and the resin when the temperature is raised, and the fixed bonded surfaces may be peeled off.

The present disclosure has been made in consideration of such circumstances, and an object of the present disclosure is to provide a display device capable of maintaining a good appearance.

In order to solve the above-mentioned problems, the display device of the present disclosure is composed of an inner case made of a first material and a second material having a coefficient of linear expansion larger than that of the first material, and is integrally formed with the inner case. The inner case and the outer case are provided with an outer case, and one of the inner case and the outer case has a concave portion that is concave in the opposite direction on the facing surface thereof, and the other of the inner case and the outer case faces each other. The surface has a convex portion having a shape that fits into the concave portion, and the convex portion has a width direction length in a direction substantially orthogonal to the facing direction with respect to the tip end side of the convex portion in the width direction of the root. Has a portion longer than the length.

In the display device of the present disclosure, the appearance can be maintained well.

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 vertical sectional view taken along the line II-II of FIG. FIG. 3 is a front view of the case. An enlarged view of the upper right portion of the case of FIG. FIG. 3 is a cross-sectional view taken along the line VV of FIG. The figure which shows the modification of the side convex part and the side concave part.

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. In particular, the display device of the present disclosure can be suitably mounted on a vehicle used in a harsh environment accompanied by vibration, such as a motorcycle, an agricultural machine, and 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 side.
FIG. 2 is a vertical cross-sectional view taken along the line II-II of FIG.

In the following description, "front (front)", "rear (rear)", "top", "bottom", "right", and "left" are defined as "Fr.", "Fr." 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 houses the display unit 30, the circuit board 40, and the like, and protects them from external impact, dust, and the like. The case 10 has a front opening 10a that exposes the display screen 35 of the display unit 30 to the front side. The case 10 has a vertical portion and a horizontal portion, and has a substantially L-shaped cross section. Details of Case 10 will be described later.

The display unit 30 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 encapsulating 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 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 executes a predetermined arithmetic process according to a program written in the ROM, for example. For example, the control unit 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 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. 3 is a front view of the case 10. In FIG. 3, in order to facilitate the distinction between the metal case 15 and the resin case 21, they are shown using different hatching.
FIG. 4 is an enlarged view of the upper right portion of the case 10 of FIG.
FIG. 5 is a cross-sectional view taken along the line VV of FIG.

The case 10 has a metal case 15 (inner case) and a resin case 21 (outer case). 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 (first material, 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 plate-shaped member facing in the front-rear direction, and is arranged so as to cover and protect the display unit 30 mainly behind the display unit 30. The vertical portion 16 has a metal case back surface 16a (inner case first surface), a metal case side surface 16b (inner case second surface), and a metal case corner portion 16c.

The back surface 16a of the metal case is a surface facing rearward and faces the front surface 22a of the resin case. The metal case side surface 16b is a direction orthogonal to the metal case back surface 16a and is a surface along the thickness direction of the vertical portion 16. The metal case side surface 16b faces and is parallel to the resin case side surface 22b. The metal case corner portion 16c is a portion where two metal case side surfaces 16b extending in two directions, a substantially vertical direction and a substantially horizontal direction, and orthogonal to each other intersect.

The horizontal portion 17 has a box shape extending horizontally from the lower end of the vertical portion 16 to the rear, and accommodates the circuit board 40 in the internal space. The lower surface of the horizontal portion 17 forms a lower opening 10b. The lower opening 10b of the horizontal portion 17 is covered with the bottom cover 11. The bottom cover 11 is made of sheet metal (for example, galvanized steel sheet (SECC)). The bottom cover 11 protects the circuit board 40 housed in the horizontal portion 17 by covering the lower opening 10b. The horizontal portion 17 is also used for fixing 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 resin (second material, for example, polycarbonate resin or ABS resin) having a coefficient of linear expansion larger than that of metal. The resin case 21 is a box-shaped member that covers at least a region of the metal case 15 that is visible to the user when mounted on a vehicle and that may become hot due to the heat of sunlight irradiation. .. 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 visible from the opening 4a of the column cover 4. 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. 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 resin case 21 has a resin case front surface 22a (outer case first surface), a resin case side surface 22b (outer case second surface), and a resin case corner portion 22c. The front surface 22a of the resin case is a surface facing the front (first direction) and faces the back surface 16a of the metal case. The resin case side surface 22b is a surface of the resin case front surface 22a that rises substantially forward from the outer edge of the resin case front surface 22a other than the region where the horizontal portion 17 is located. The resin case corner portion 22c is a portion where two resin case side surfaces 22b extending substantially in the vertical direction and the substantially horizontal direction and orthogonal to each other intersect. The front opening 10a of the case 10 is formed by the front end 22d of the resin case side surface 22b and the front end 17d of the horizontal portion 17.

Here, as described above, the metal case 15 and the resin case 21 have an integral structure in which the back surface 16a of the metal case, the front surfaces 22a of the resin case, the side surfaces 16b of the metal case, and the side surfaces 22b of the resin case are joined by insert molding. .. However, the metal case 15 and the resin case 21 are made of materials having different coefficients of linear expansion from each other. Therefore, when the temperature becomes high due to the heat of irradiation from sunlight or the like, the amount of elongation of the resin case 21 is larger than that of the metal case 15, and there is a risk that the bonding surfaces of the resin case will be peeled off from each other. In particular, today's display devices are required to have a small case width that borders the outer periphery of the display screen, that is, to make the frame narrower or thinner. As shown in FIG. 2, between the resin case side surface 22b and the display unit 30. The metal case 15 may not be formed on the surface. In this case, the bonding area tends to be smaller than in the case where the metal case 15 is formed between the resin case side surface 22b and the display unit 30. For this reason, the bonding surface may be further peeled off.

On the other hand, the display device 1 in the present embodiment has a structure for restraining the metal case 15 and the resin case 21 in a concavo-convex shape that is in a mutually engaging relationship. As a result, it is possible to suppress deformation in which the resin case 21 and the metal case 15 tend to be relatively separated.

The metal case 15 (one of the inner case and the outer case) has a recess on the surface facing the resin case 21 which is concave in the facing direction. Specifically, the metal case 15 has a back surface recess 18, a side surface recess 19, and a corner recess 20.

The back recess 18 is provided on the back surface 16a of the metal case (one of the first surface of the outer case and the first surface of the inner case), and is a portion that is recessed forward in the direction opposite to the front surface 22a of the resin case. Specifically, the back recess 18 is a through hole in the front-rear direction. The back surface recesses 18 are uniformly provided at six locations over the back surface 16a of the metal case, for example.

The side surface recess 19 is provided on the metal case side surface 16b (one of the outer case second surface and the inner case second surface) and is a portion that is recessed in the direction opposite to the resin case side surface 22b. Specifically, the side surface recesses 19 are portions in which the required number is provided substantially evenly on the metal case side surfaces 16b extending in the vertical direction and the horizontal direction, and are concave in the horizontal direction and the vertical direction, respectively. The corner recesses 20 are provided at four metal case corners 16c (one of the outer case corner and the inner case corner) and are recessed from the metal case corner 16c in the substantially diagonal center direction.

The resin case 21 (the other of the inner case and the outer case) has a shape that fits into the back recess 18, the side recess 19, and the corner recess 20 on the surface facing the metal case 15, and is convex in the opposite direction. Has a part. Specifically, the resin case 21 has a back surface convex portion 25, a side surface convex portion 26, and a corner convex portion 27.

The back convex portion 25 is provided on the front surface 22a of the resin case (the other of the first surface of the outer case and the first surface of the inner case), and is a portion that projects substantially vertically forward in the direction facing the back surface 16a of the metal case. The back convex portion 25 is provided at a position corresponding to the back concave portion 18. The back convex portion 25 has a length in the front-rear direction substantially the same as the length in the front-rear direction of the back concave portion 18, and the front end surface 25a of the back convex portion 25 is on the same surface as the front surface 16d of the vertical portion 16.

The side surface convex portion 26 (the other of the outer case second surface and the inner case second surface) is provided on the resin case side surface 22b and is a portion that is convex in the direction facing the metal case side surface 16b. The side surface convex portion 26 is provided at a position corresponding to the side surface concave portion 19. The corner convex portion 27 is a portion provided on the resin case corner portion 22c (the other of the outer case corner portion and the inner case corner portion) and is convex from the resin case corner portion 22c in the substantially diagonal center direction. The corner convex portion 27 is provided at a position corresponding to the corner concave portion 20.

Such a back concave portion 18, a side concave portion 19 and a corner concave portion 20, and a back convex portion 25, a side convex portion 26 and a corner convex portion 27 have a shape that fits each other as described above, but in particular, the back convex portion It has a shape in which the width increases from the roots 25c, 26c, 27c of the portion 25, the side convex portion 26, and the corner convex portion 27 toward the tips 25b, 26b, 27b, that is, an inverted tapered shape. In particular, as shown in FIG. 5, the side convex portion 26 and the corner convex portion 27 are formed from the front surface 22a of the resin case, so that the front surface 22a of the resin case has the roots 26c and 27c, and the shape of the reverse taper toward the front is also formed. It can have both the shapes of the back convex portion 25 and the side convex portion 26.

As a result, as described above, the metal case 15 and the resin case 21 form an engaging relationship with each other and restrain each other in the opposite direction. Specifically, the metal case 15 restrains the movement of the resin case 21 in the direction away from the rear by engaging the back concave portion 18 with the back convex portion 25. Further, the metal case 15 restrains the movement of the resin case 21 in the direction away from the outside and the rear by engaging the side surface concave portion 19 and the corner concave portion 20 with the side surface convex portion 26 and the corner convex portion 27. Therefore, when the temperature of the case 10 becomes high, the resin case 21 is restrained in the opposite direction of the extension direction, and the bonding surface with the metal case 15 is difficult to peel off. As a result, the appearance of the case 10 (display device 1) is good. Can be maintained.

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, an example in which the metal case 15 and the resin case 21 are integrally formed by insert molding has been described, but the metal case back surface 16a, the resin case front surface 22a, and the metal case side surfaces are formed separately by using an adhesive or the like. 16b and the resin case side surfaces 22b may be bonded to each other. In this case, since the metal case 15 and the resin case 21 cannot be combined due to the reverse taper shape from the resin case front surface 22a of the back convex portion 25 to the front, the resin case front surface 22a of the back concave portion 18 and the back convex portion 25 The reverse taper shape from to the front is omitted.

Further, although an example in which the shapes of the back convex portion 25 and the side convex portion 26 are inversely tapered shapes has been described, the tips 25b, 26b, 27b of the back convex portion 25, the side convex portion 26, and the corner convex portion 27 have been described. Any shape may be used as long as the width direction length in the direction substantially orthogonal to the opposite direction has a portion longer than the width direction length of the roots 25c, 26c, 27c. For example, as shown in FIG. 6 using a modified example of the side convex portion 26, the back convex portion 25, the side convex portion 26, and the corner convex portion 27 may have a T-shape or a circular shape.

1 Display device 2 Column tube 3 Steering shaft 4 Column cover 4a Opening 10 Case 10a Front opening 10b Lower opening 11 Bottom cover 15 Metal case (inner case)
16 Vertical part 16a Back side of metal case (first side of inner case)
16b Metal case side surface (inner case second surface)
16c metal case corner (inner case corner)
16d Front 17 Horizontal 17a Top 17d Front end 18 Back recess (recess)
19 Side recess (recess)
20 Corner recesses (recesses)
21 Resin case (outer case)
22a Front surface of resin case (first surface of outer case)
22b Resin case side surface (outer case second surface)
22c Resin case corner (outer case corner)
22d Front end 25 Back convex part (convex part)
25a Tip surface 25b, 26b, 27b Tip 25c, 26c, 27c Root 26 Side convex part (convex part)
27 Square convex part (convex part)
30 Display unit 30a Front 30b End 33 Flexible printed circuit board 35 Display screen 40 Circuit board 50 Protective cover

Claims (6)

An inner case made of the first material and
An outer case made of a second material having a coefficient of linear expansion larger than that of the first material and integrally formed with the inner case is provided.
One of the inner case and the outer case has a recess on the facing surface thereof, which is concave in the facing direction.
The other of the inner case and the outer case has convex portions having a shape that fits into the concave portions on the facing surfaces thereof.
The convex portion is a display device having a portion on the tip end side of the convex portion whose width direction length in a direction substantially orthogonal to the facing direction is longer than the width direction length of the root. The outer case has a first surface of the outer case facing the first direction and a second surface of the outer case rising substantially in the first direction from the outer edge of the first surface of the outer case.
The inner case has an inner case first surface facing the outer case first surface and an inner case second surface facing the outer case second surface.
The recess is provided on one of the outer case second surface and the inner case second surface.
The display device according to claim 1, wherein the convex portion is provided on the other side of the outer case second surface and the inner case second surface. The recess is further provided on one of the outer case first surface and the inner case first surface.
The display device according to claim 2, wherein the convex portion is further provided on the other of the first surface of the outer case and the first surface of the inner case. The outer case has an outer case corner where the second surfaces of the two outer cases extending in two directions intersect.
The inner case has an inner case corner where the second surfaces of the two inner cases extending in the two directions intersect.
The recess is provided in one of the outer case corner and the inner case corner.
The display device according to claim 2, wherein the convex portion is provided on the other side of the outer case corner portion and the inner case corner portion. The first material is a metal
The display device according to claim 1, wherein the second material is a resin. The display device according to claim 1, wherein the convex portion has an inverted taper shape, a T-shape, or a circular shape.

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