JP2015135430A - display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that maintains a waterproof performance without degradation in display quality.SOLUTION: A display panel 10 displays an image. A protective panel member 20 allows the image to be visible through the protective panel member 20. A ring gasket 50 is provided on an edge of the protective panel member 20. A case 30 contains the display panel 10. The display panel 10 adheres to the protective panel member 20 by using a translucent adhesive 15. The case 30 is made of resin and has an upper case 31 and a lower case 32 that press the gasket 50. The upper case 31 is in no contact with the protective panel member 20. The upper case 31 has a contact portion 31d contacting with the lower case 32. The lower case 32 is fixed on the upper case 31 by using a self-tapping screw 35.

Description

  The present invention relates to a display device including a display panel for displaying an image.

  Conventionally, various display devices in which a display panel is bonded to a protective panel have been proposed. For example, Patent Document 1 discloses the display device. Such a display device includes a display panel, a translucent protective panel covering the front surface of the display panel, a bonding layer made of a photocurable resin interposed between the display panel and the protective panel without any gap, and a display panel. And a housing having an opening for allowing the display surface of the display panel to be visible through the protective panel. In such a display device, since a bonding layer is interposed between the display panel and the protective panel and the bonding layer is in close contact with the back surface of the protective panel, no condensation occurs on the back surface of the protective panel.

JP 2012-68426 A

  However, in the display device described in Patent Document 1, a waterproof structure is configured by sandwiching a gasket between opposing surfaces of the protective panel and the casing, and the opening of the casing and the protective panel are in contact with each other. When the fixing screw is tightened strongly, the protective panel is deformed by applying an uneven pressure to the protective panel from the opening of the housing, and the display panel is distorted through the bonding layer, and the display quality is deteriorated. It had the problem that.

  If the fixing screw is tightened so that the protective panel does not deform, the casing opening and the protective panel are in contact with each other, so there is a risk that sufficient compression cannot be applied to the gasket. When used as a motorcycle display, marine display, construction machine display, and agricultural machine display used in Japan, the casing is subject to large external vibrations, thus maintaining waterproof performance for a long period of time. I had a problem that I couldn't.

  In order to solve the above-described problems, the present invention provides a display device that does not deteriorate display quality and can maintain waterproof performance.

  The present invention accommodates a display panel 10 that displays an image, a protective panel member 20 through which the image can be seen, an annular packing 50 provided at an edge of the protective panel member 20, and the display panel 10. A display device in which the display panel 10 is bonded to the protective panel member 20 with a translucent adhesive 15, wherein the case body 30 is made of resin, and the packing The upper case 31 has a top case 31 and a bottom case 32 that press 50, and the top case 31 is not in contact with the protective panel member 20.

  In the present invention, the lower case 32 is not in contact with the protective panel member 20.

  In the present invention, the upper case 31 has an abutting portion 31 d that abuts on the lower case 32.

  In the present invention, the lower case 32 is fixed to the upper case 31 by a tapping screw 35.

  In the present invention, the lower case 32 has a flange portion 32c through which the tapping screw 35 is inserted.

  The display quality is not deteriorated and the waterproof performance can be maintained.

The front view which shows 1st embodiment of this invention. Sectional drawing which shows embodiment same as the above. The principal part expanded sectional view which shows embodiment same as the above. The principal part expanded sectional view which shows embodiment same as the above. The principal part expanded sectional view which shows 2nd embodiment of this invention. The principal part expanded sectional view which shows 3rd embodiment of this invention. The principal part expanded sectional view which shows 4th embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 4 show a first embodiment. The vehicle display device includes a liquid crystal display panel 10, a cover plate 20, a case body 30, a circuit board 40, and a packing 50.

  The liquid crystal display panel 10 includes a TFT color liquid crystal module, and displays vehicle information such as vehicle speed. The liquid crystal display panel 10 may be of a multi-dot or segment type, and may be a single color display or a full color display. The display panel may be an EL module. The liquid crystal display panel 10 is optically coated with a translucent adhesive 15 and is in close contact with the rear surface of the cover plate 20. The translucent adhesive 15 is a photo-curing adhesive.

  The cover plate 20 is obtained by forming a light shielding portion 22 made of a black print layer on the rear surface of a flat plate-like transparent substrate 21, and has a rectangular shape when viewed from the front. The substrate 21 of the cover plate 20 may be made of inorganic glass or may be made of organic glass such as acrylic. The light shielding portion 22 of the cover plate 20 has a rectangular window portion 22a that allows the image of the liquid crystal display panel 10 to be seen through.

  The case body 30 is made of a resin such as AES, ABS, PP, and has an upper case 31 and a lower case 32. The case body 30 accommodates the liquid crystal display panel 10 and the circuit board 40. The upper case 31 of the case body 30 is provided at a front wall portion 31a substantially parallel to the liquid crystal display panel 10, a peripheral wall portion 31b formed perpendicularly from an outer edge of the front wall portion 31a, and an inner edge of the front wall portion 31a. A concealing portion 31c and a boss portion 31d that contacts the lower case 32. The boss portion 31d of the upper case 31 has a substantially cylindrical shape and has a prepared hole 31 into which the tapping screw 35 is inserted.

  The concealing portion 31c of the upper case 31 is concealed so that the packing 50 is difficult to be visually recognized. The concealing portion 31c of the upper case 31 has a protruding portion 31g that protrudes toward the cover plate 20 from the rear surface of the front wall portion 31a. The front surface of the concealing part 31c is an inclined surface. A rectangular opening 31f for visually recognizing the image of the liquid crystal display panel 10 is formed in the concealing part 31c of the upper case 31, and the opening 31f is substantially the same size as the window 22a of the light shielding part 22. It has become.

  The lower case 32 of the case body 30 includes a bottom wall portion 32a substantially parallel to the liquid crystal display panel 10, a side wall portion 32b formed perpendicularly from the outer edge of the bottom wall portion 32a, and a front end portion from the side wall portion 32b. And a flange portion 32c provided vertically. A lower hole 32 k through which the tapping screw 35 is inserted is formed in the flange portion 32 c of the lower case 32. The lower case 32 is fixed to the upper case 31 with a tapping screw 35. The lower case 32 is not in contact with the cover plate 20.

  The circuit board 40 is obtained by forming a wiring pattern made of copper foil on a base material made of glass epoxy resin. The liquid crystal display panel 10 is electrically connected to the circuit board 40 by a flexible wiring member (not shown). The packing 50 is made of a waterproof rubber such as EPDM, chloroprene rubber, or fluorine rubber. It is desirable that the packing 50 has a rubber hardness shore of 60 degrees (TYPE A) or less. The packing 50 has an annular shape when viewed from the front, and is provided at the edge of the cover plate 20. The packing 50 has a U-shaped cross section, and includes a front surface portion 51 that contacts the front surface of the cover plate 20, a rear surface portion 52 that contacts the rear surface of the cover plate 20, and a side surface that contacts the peripheral end surface of the cover plate 20. Part 53.

  When the lower case 32 is fixed to the upper case 31 by the tapping screw 25, the front wall portion 31a of the upper case 41 abuts on the front surface portion 51 of the packing 50, and the flange portion 32c of the lower case 32 is the rear surface portion 52 of the packing 50. The packing 50 is pressed by the upper case 31 and the lower case 31. The protrusion 31 g of the upper case 31 and the cover plate 20 have a predetermined distance D, and the upper case 31 is not in contact with the cover plate 20.

  FIG. 5 shows a second embodiment. The upper case 31 is fixed to the flange portion 32 c by a welding portion 65. The boss portion 31d of the upper case 31 is welded to the front surface of the flange portion 32c. As a welding method, there are laser welding and ultrasonic welding.

  FIG. 6 shows a third embodiment. The boss portion 31d of the upper case 31 is thermally welded to the flange portion 32c. The welding pin 31p of the boss portion 31d is inserted into the flange portion 32c and melted on the rear surface of the flange portion 32.

FIG. 7 shows a fourth embodiment. The peripheral wall 31b of the upper case 31 is
The upper case 31 is locked to the lower case 32 by the locking portion 31s. The rear surface of the boss portion 31d is in contact with the front surface of the flange portion 32c.

  According to each embodiment, the liquid crystal display panel 10 is not distorted and the display quality is not deteriorated, and even in a display device that has large vibration and is used outdoors for a long period of time, the vibration resistance is high and the period is long. Waterproof performance can be maintained across.

10 Liquid crystal display panel (display panel)
15 Translucent adhesive 20 Cover plate (protective panel member)
30 Case body 31 Upper case 31d Boss part (contact part)
32 Lower case 32c Flange part 35 Tapping screw 50 Packing (elastic member)

Claims (5)

A display panel for displaying an image; a protective panel member capable of seeing through the image; an annular packing provided at an edge of the protective panel member; and a case body for housing the display panel, A display device in which a display panel is bonded to the protective panel member with a translucent adhesive,
The display device according to claim 1, wherein the case body is made of resin, and has an upper case and a lower case that press the packing, and the upper case is not in contact with the protective panel member.   The display device according to claim 1, wherein the lower case is not in contact with the protective panel member.   The display device according to claim 1, wherein the upper case includes a contact portion that contacts the lower case.   The display device according to claim 1, wherein the lower case is fixed to the upper case by a tapping screw.   The display device according to claim 4, wherein the lower case has a flange portion through which the tapping screw is inserted.

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