JP2020112759A - Display device - Google Patents

Abstract

To provide a display device that can improve flexibility in design.SOLUTION: A display device comprises a display unit 30, a case member 10 accommodating the display unit 30 and having an opening 11 to expose the display unit 30 to the front side, a protective member 20 covering the opening 11 at the front side of the display unit 30, and a light transmissive adhesive member 50 formed in close contact with the display unit 30 and the protective member 20 between the display unit 30 and the protective member 20. The display unit 30 has a wall member 37 protruding toward the protective member 20 and surrounding a periphery of at least a part of the light transmissive adhesive member 50.SELECTED DRAWING: Figure 2

Description

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

BACKGROUND ART Conventionally, there is known a display device in which a transparent resin layer is provided between a display panel and a protective plate arranged on the front side of the display panel (see, for example, Patent Document 1). The transparent resin layer is made of, for example, a silicone material. The transparent resin layer is formed in a region partitioned by a frame member or the like provided between the display panel and the protective plate.

JP, 2009-86073, A

A display device mounted on a vehicle or the like is arranged in a limited space such as an instrument panel of the vehicle. For this reason, the dimensions of the case or the like that define the external dimensions of the display device must be set within a predetermined range.

However, when the frame member as described above is provided in the case, there is a problem in that the frame member needs a clearance from other peripheral members, which increases the size of the display device.

The present invention has been made in view of such circumstances, and an object thereof is to provide a display device capable of improving the degree of freedom in design.

In order to solve the above-described problems, a display device according to the present invention is provided with a display unit, a case member that accommodates the display unit and has an opening that exposes the display unit to the front side, and a front surface of the display unit. A protective member covering the opening; and a translucent adhesive member formed between the display unit and the protective member so as to be in close contact with the display unit and the protective member. It has a wall member which projects toward the member side and surrounds the periphery of at least a part of the translucent adhesive member.

In the display device according to the present invention, the degree of freedom in design can be improved.

The front view which shows embodiment of the display apparatus which concerns on this invention. Sectional drawing which follows the II-II line of FIG. The disassembled perspective view of a display unit. (A) is a figure which shows the display apparatus as a 1st modification, (b) is a figure which shows the display apparatus as a 2nd modification. (A) is a figure which shows the display apparatus as a 3rd modification, (b) is a figure which shows the display apparatus as a 4th modification, (c) is a display apparatus as a 5th modification. FIG.

An embodiment of a display device according to the present invention will be described with reference to the accompanying drawings. INDUSTRIAL APPLICABILITY The display device according to the present invention can be applied to all display devices having a display panel and a protection member for protecting the display panel on the front side, for example, vehicles such as automobiles and motorcycles, ships, and agriculture. It can be mounted on machines and construction machines.

FIG. 1 is a front view showing a display device 1 which is an embodiment of a display device according to the present invention.
FIG. 2 is a sectional view taken along the line II-II of FIG.

In the following description, “front (front)”, “rear (rear)”, “top”, “bottom”, “right”, and “left” are the definitions “Fr.” and “Fr.” in FIGS. Re.”, “To.”, “Bo.”, “R”, and “L”.

The display device 1 mainly includes a case member 10, a display unit 30, a protective member 20, a circuit board 40, a translucent adhesive member 50, and a double-sided adhesive tape 60.

The case member 10 is made of black resin (for example, polypropylene). The case member 10 covers and holds the display unit 30, the circuit board 40, and the like from the back side, and protects the display unit 30, the circuit board 40, and the like from external impact, dust, and the like. The case member 10 has an opening 11 that exposes the display panel 31 (display unit 30) to the front side. The opening 11 is covered by the protective member 20 on the front surface of the display panel 31.

The protection member 20 is a plate-shaped member and covers the display unit 30 and the circuit board 40 inside the case member 10 from the front side to protect them from dust and the like.

The protection member 20 includes a base material 21 and a printed layer 22. The base material 21 is a translucent thermoplastic resin (for example, a polycarbonate resin, a polymethylmethacrylate resin (PMMA), or an inorganic glass). The print layer 22 forms, on the back surface (or front surface and both surfaces) of the base material 21, a light shielding area provided in the display panel 31 other than the display area visible to the user.

The display unit 30 includes a display panel 31, a backlight unit 32, a front frame 36, and a rear frame 38. FIG. 3 is an exploded perspective view of the display unit 30.

The display panel 31 is, for example, a normally black type (black display when no voltage is applied) liquid crystal display panel of a TFT (Thin Film Transistor) system. The display panel 31 has a pair of surface glass substrates enclosing a liquid crystal layer. Transparent electrodes are formed of ITO (Indium Tin Oxide) or the like on the pair of glass substrates. The display panel 31 also has a pair of surface polarizing plates (polarization filters) arranged so as to sandwich the pair of surface glass substrates. The display panel 31 is connected to the circuit board 40 via FPC (Flexible Printed Circuits, not shown). The display panel 31 is controlled by the control unit of the circuit board 40 to apply a drive voltage to the liquid crystal layer via the transparent electrode. 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 31 is changed to display an image.

The backlight unit 32 is provided on the back side of the display panel 31. The backlight unit 32 mainly has optical sheets 33 and 34, a light guide 35, and a light source, and illuminates the display panel 31 from the back side. The light source includes a plurality of LEDs (Light Emitting Diodes), and is connected to the circuit board 40 via a flexible board such as an FPC. When the drive current is supplied to the LED, the LED emits light toward the light guide body 35. The light guide 35 guides the light emitted from the LED to the display panel 31 via the optical sheets 33 and 34. The light guide 35 is a transparent resin (for example, PC (polycarbonate)) formed in a flat plate shape.

The front frame 36 and the rear frame 38 accommodate the display panel 31 and the backlight unit 32 when combined. The front frame 36 is a metal frame body formed in a box body having an open rear side. The rear surface frame 38 is a metal frame body formed in a box body having an open front. The front frame 36 and the rear frame 38 are fitted to each other and accommodate the display panel 31 and the backlight unit 32.

The front frame 36 exposes the display panel 31 from the opening 36a on the front side of the display unit 30 and surrounds the periphery of the display panel 31. The front frame 36 has a wall member 37 that is on the front side and projects toward the protection member 20 side during assembly.

The wall member 37 surrounds the periphery of at least a part of the translucent adhesive member 50. The wall member 37 has a wall surface 37a raised from the inner peripheral edge 36b of the front frame 36 to the front side, and a front end 37b. The wall member 37 is formed so as to be located behind the printing layer 22 of the protection member 20. That is, the wall member 37 is shielded by the print layer 22 and is not visible from the front side of the display device 1 through the protective member 20. The front end 37b faces the protection member 20 via the gap 2. Although the wall member 37 is provided on the entire circumference of the inner peripheral edge 36b in FIG. 3, the wall member 37 may be provided only on the left and right sides or only on the upper and lower sides, and is provided intermittently instead of continuously. Good.

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 predetermined arithmetic processing according to a program written in the ROM, for example. The control unit acquires, for example, a vehicle speed, an engine speed, various vehicle information, navigation information, and the like from an ECU (Electronic Control Unit) of the vehicle through various sensors and the like. The control unit controls the display unit 30 to display the information based on the acquired information.

The translucent adhesive member (adhesive member) 50 is formed between the display panel 31 (display unit 30) and the protective member 20 in close contact with the display panel 31 and the protective member 20. The adhesive member 50 is an adhesive that adheres the display panel 31 and the protective member 20 by optical bonding. The adhesive member 50 is a transparent resin material (for example, silicone-based, urethane-based, or acrylic-based resin) having a refractive index almost equal to that of the protection member 20. The adhesive member 50 is provided to reduce the interface reflectance between the protective member 20 and the display panel 31. The thickness of the adhesive member 50 is, for example, 50 μm to 2000 μm.

The double-sided adhesive tape 60 fixes the front frame 36 and the protection member 20 on the outer peripheral side of the wall member 37. The double-sided adhesive tape 60 is provided at a required position on the front surface 36c of the front frame 36. The double-sided pressure-sensitive adhesive tape 60 has a thickness that protrudes more frontward than the front end 37b of the wall member 37.

Next, an operation for assembling the protection member 20 and the display panel 31 will be described.

First, the protective member 20 and the front surface 36c of the front frame 36 are bonded with the double-sided adhesive tape 60. At this time, the front end 37 b of the wall member 37 faces the protection member 20 through the gap 2 without contacting the protection member 20.

Next, a liquid transparent resin material to be the adhesive member 50 is poured into the space surrounded by the wall member 37. Since the wall member 37 functions like a bank, the adhesive member 50 can reduce overflowing to the double-sided adhesive tape 60 side. Therefore, it is possible to prevent the transparent resin material from flowing to the double-sided adhesive tape 60 and lowering the adhesiveness of the double-sided adhesive tape 60. The poured transparent resin material is cured by a required curing treatment to become the adhesive member 50.

Such a display device 1 can improve the degree of freedom in design. That is, when the member that functions as a bank of the adhesive member 50 is formed separately from the front frame 36 (display unit 30), it is necessary to provide a clearance between this member and the opening 36a. However, since the display device 1 according to the present embodiment has the wall member 37 formed integrally with the opening 36a, such a clearance can be omitted, and the accommodation space required in the case member 10 can be reduced. Accordingly, the display device 1 can be downsized and the degree of freedom in design can be improved.

Further, in the display device 1, the number of parts can be reduced and the cost of parts of the display device 1 can be reduced as compared with the case where a member that functions as a bank of the adhesive member 50 is formed separately.

Further, since the gap 2 is provided between the wall member 37 and the protection member 20, even if the amount of the transparent resin material poured in is large, the transparency from the gap 2 to the outside of the wall member 37 is increased. An escape route for the resin material can be formed. As a result, it is possible to prevent pressure from being applied in the direction in which the protective member 20 and the display unit 30 are peeled off by the excessive adhesive member 50.

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 forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope of equivalents thereof.

For example, the wall member is not limited to the wall shape that rises to the front side like the wall member 37 described above, and may have various shapes that project to the front side.

For example, FIG. 4A is a diagram showing a display device as a first modification, and FIG. 4B is a diagram showing a display device as a second modification. The components and parts corresponding to those of the display device 1 of FIG. 2 are designated by the same reference numerals, and the duplicated description will be omitted.

The wall member 70 shown in FIG. 4A has a bent portion 71 that is formed by rising from the inner peripheral edge 36b of the front frame 36 and then further bending toward the outer peripheral side. The wall member 70 can form a wall surface 72 having a constant height toward the front side by the bent portion 71, and the wall surface 72 can function as a bank of the adhesive member 50.

The wall member 80 shown in FIG. 4B has a bent portion 81 that is raised in a convex shape. The bent portion 81 having a constant height with the front-back direction as the surface direction can function as a bank of the adhesive member 50.

Further, the wall member may function not only as a bank for the adhesive member but also as a positioning member for the protective member of the display unit.

For example, FIG. 5A is a diagram showing a display device as a third modification, FIG. 5B is a diagram showing a display device as a fourth modification, and FIG. 5C is a fifth modification. It is a figure which shows the display device as. The components and parts corresponding to those of the display device 1 shown in FIG.

The wall member 90 of FIG. 5A is different from the wall member 37 of FIG. 2 in that the wall member 90 has a height (length in the front-rear direction) that protrudes forward of the double-sided adhesive tape 60.

The protection member 100 includes a light transmitting portion 101 and a light shielding portion 102. The translucent part 101 is a transparent resin member like the above-mentioned protective member 20. The transparent portion 101 is formed in the display area of the display panel 31. The light shielding portion 102 is a resin member that is formed on the outer periphery of the light transmitting portion 101 and has a light shielding property. The light-shielding portion 102 has a recess 103 at a position facing the front end 91 of the wall member 90 for positioning the front end 91 on the protection member 100.

In such a display device, when positioning the protective member 100 and the display unit 30, it is not necessary to hold and position the protective member 100 and the display unit 30 by a separate jig, and the protective member 100 and the display unit 30 are not required to be positioned. Can be positioned only by. Further, since the wall member 90 and the recess 103 can be positioned with high accuracy, it is possible to suppress the positional deviation between the light transmitting portion 101 of the protective member 100 and the display area of the display unit 30.

Further, as shown in FIG. 5B, the wall member 110 may have a bent portion 111 formed by rising from the inner peripheral edge 36b of the front frame 36 and then bending to the rear side. In this case, the bent portion 111 fits into the recess 103 and is positioned.

Furthermore, as shown in FIG. 5C, the wall member 120 may be provided on a part other than the front frame, for example, on the rear frame 38. In this case, the front frame 36 and the double-sided adhesive tape 60 are omitted.

1 Display Device 2 Gap 10 Case Member 11 Opening 20, 100 Protective Member 21 Base Material 22 Printing Layer 30 Display Unit 31 Display Panel 32 Backlight Unit 33 Front Frame 34 Light Source Substrate 35 Rear Case 36 Front Frame 36a Opening 36b Inner Edge 36c Front 37, 70, 80, 90, 110, 120 Wall members 37a, 72 Wall surfaces 37b, 91 Front end 38 Rear frame 40 Circuit board 50 Translucent adhesive member (adhesive member)
60 Double-sided adhesive tape 71, 81, 111 Bending portion 101 Light transmitting portion 102 Light shielding portion 103 Recessed portion

Claims (5)

Display unit,
A case member that accommodates the display unit and has an opening that exposes the display unit to the front side;
A protective member that covers the opening on the front surface of the display unit;
A translucent adhesive member formed in close contact with the display unit and the protective member between the display unit and the protective member,
The display unit includes a wall member that protrudes toward the protection member side and surrounds at least a peripheral edge of the translucent adhesive member. The display device according to claim 1, wherein the wall member has a front end facing the protection member with a gap therebetween. The display unit has a front frame on the front side of the display unit,
The display device according to claim 1, wherein the wall member is provided on the front frame. The display device according to claim 1, wherein the display unit and the protective member are fixed on the outer peripheral side of the wall member by a double-sided adhesive tape. The display device according to claim 1, wherein the protective member has a recess at a position facing the wall member for positioning the wall member on the protective member.

Images