JPH09171360A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively eliminate a harmful space caused between a printed circuit board added on the lower surface of an edge part of a switch case and a housing without causing complexity and cost increase for assembly work, in a liquid crystal display device using a combination of installations of a touch switch arranging a light emitting element and a light receiving element to face each other and a picture frame shape switch case having a printed circuit board for touch panel. SOLUTION: A skirt plate 19 hanging down a ecessary length from a front edge of a substrate mounting part 18 on the back of an edge part 9 of a switch case 2 is integratedly provided, and when this skirt plate 19 is combined with a liquid crystal part 1 and the switch case 2, it closes the opening of the space and shields a visual field of a person to watch a LCD 3 from the 'miscellaneous', such as electronic parts, wiring, etc. in the space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device which is installed in the center of an instrument panel of an automobile and displays necessary information such as a map on a liquid crystal display.

[0002]

2. Description of the Related Art As a liquid crystal display device installed on an instrument panel of an automobile, there is a known example shown in Japanese Patent Publication No. 5-4541 (see FIG. 2), and an LCD 3 (liquid crystal display) is housed in a housing 8. Liquid crystal part 1,
It is composed of a combination of frame-shaped switch cases 2 having the switch device for the LCD 3 and mounted on the periphery of the liquid crystal part 1. By operating the switch devices, display objects such as maps appearing on the LCD 3 can be displayed on the switch case 2. It has a basic structure through which the filter 4 is visible.

That is, the switch case 2 is a touch switch composed of a light emitting element 5 and a light receiving element 6 provided inside an edge portion 9 of a ring shape such as a square (or a switch knob protruding outside the edge portion). Mechanical switch consisting of),
The printed circuit board 7 for detecting the switch operation of the touch switch is attached to the lower side of the edge portion 9, and a slight gap 10 is provided between the printed circuit board 7 of the switch case 2 and the housing 8. The electronic components and the wirings are housed in the gap 10.

However, the portion of the gap 10 is the LCD 3
If the line of sight of a person who visually recognizes is easily entered and the electronic components / wirings and internal structures existing there are seen, the visibility for confirming the display surface of the LCD 3 is hindered and the liquid crystal display article is displayed. As it lacks in appearance quality,
A shield plate 11 which is vertically provided at the entrance of the gap 10 and a blind plate 13 which is a separate annular body having a T-shaped cross-section and in which a mounting flange 12 is provided on the back surface of the shield plate 11 are prepared. 12 is placed on the switch case 2 so as to overlap the printed circuit board 7, and the entrance of the harmful gap 10 is blocked.

[0005]

In the liquid crystal display device having the above-described conventional structure, by mounting the blind plate 13, the gap 10 existing at the joint between the liquid crystal part 1 and the switch panel 2 is shielded, and the visual quality of the LCD 3 is improved. Although the deterioration of the appearance quality can be prevented, it is necessary to prepare and assemble a separate blindfold plate 13, which causes an increase in the number of assembling steps and a high cost. The present invention provides a liquid crystal display device that solves the above-mentioned drawbacks of the prior art.

[0006]

The liquid crystal display device of the present invention for solving the above technical problems is described as "a frame-shaped device having a switch device for the liquid crystal display at the periphery of the liquid crystal part whose main part is the liquid crystal display. In a liquid crystal display device in which a switch case is mounted and combined, a skirt plate vertically provided at an inner peripheral lower end of the switch case and integrated with the switch case is provided, and the switch case and the liquid crystal in the combined state are provided. The structure has a structure in which the entrance of the gap existing between the facing portions is shielded by the skirt plate. And, preferably, the switch case having the skirt plate is formed of a material having heat resistance equal to or higher than the melting temperature of the solder.

[0007]

In the liquid crystal display device of the present invention having the above-described structure, the skirt plate integrated with the switch case exists, and when the switch case is combined with the liquid crystal part, the gap existing between the switch case and the liquid crystal part is reduced. Since it is shielded by the skirt plate, it is possible to effectively prevent the "ragged state" in the gap from entering the visual field. Further, since the skirt plate has an integral structure with the switch case, the number of assembling steps and the cost are not increased.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention described above is carried out as in the following embodiments.

[0009]

Example: Installed on an automobile instrument panel,
A liquid crystal display device according to an embodiment of the present invention for providing a driver or the like with necessary information such as a map will be described in detail with reference to FIG. That is, "the liquid crystal unit 1 in which the LCD 3 is housed in the housing 8 and the LCD 3 is exposed from the window of the housing 8" and "the light emitting element 5 and the light receiving element 6 which are disposed inside the edge portion 9 to face each other
And a frame-shaped switch case 2 "having a switch device provided with a printed circuit board 7 for detecting a switch operation of the touch switch. The printed circuit board 7 is attached below the edge portion 9. The switch case 2 is mounted on the peripheral portion of the liquid crystal part 1 and assembled, and the LCD is activated by the operation of the touch switch.
In a liquid crystal display device in which necessary information such as a map is displayed on 3, and the liquid crystal display is viewed through the filter 4 provided on the switch case 2, the switch case 2 has the following shape.

That is, the switch case 2 (see FIG. 1B)
), A ridge 9 having a levee shape that surrounds a rectangular frame forms a main part, and a receiving / light emitting element accommodating recessed portion 16 that opens inside the rim 9 is provided at an important point in this rim 9. The light-emitting element 5 or the light-receiving element 6 is housed in the light-receiving / light-emitting element housing recess 16 which is provided so as to face each other and faces each other to form a touch switch. A flange-shaped filter receiving portion 17 is provided so as to project from the inside of the lower end of the edge portion 9. By mounting the peripheral edge of the transparent filter 4 on the filter receiving portion 17, the filter 4 is fitted into the switch case 2. The lower surface of the edge portion 9 that has a shape that corresponds to the back side of the filter receiving portion 17 is formed into a substrate attachment portion 18 that is a flat surface parallel to the filter receiving portion 4.
The switch substrate 7 is attached to the switch substrate 8 and attached. In the figure, 20 is a corner cover that is provided outside the edge 9 to protect the edge 9, and 15 is a cover case that encloses and protects the switch case 2.

The switch case 2 has a skirt plate 19 of a slightly long length, which hangs downward from the front end of the filter receiving portion 17 in the downward direction of the edge portion 9, integrally with the edge portion 9, and the switch case 2 of this embodiment has It is formed of POLYPHENYLENE (PPS) having heat resistance above the solder melting temperature. When the switch case 2 is mounted on the liquid crystal part 1 and assembled, the switch case 2 and the peripheral part of the housing 8 of the liquid crystal part 1 facing each other in the combined posture.
The skirt plate 19 hangs down at the entrance of the gap 10 with the printed circuit board 7 attached to the skirt to close the entrance.

In the liquid crystal display device of the embodiment shown in FIG. 1 described above, the skirt plate 19 integral with the switch case 2 closes the entrance of the gap 10, so that electronic components, wiring, etc. present in the gap 10 are "cluttered". Does not enter the visual field of the viewer who sees the screen of the LCD 3, the screen can be comfortably and clearly grasped, and the appearance of the article as a liquid crystal display object is improved. Then, only by combining the switch case 2 integrally having the skirt plate 19 with the liquid crystal part 1, it becomes possible to enjoy the effects thereof, and the work becomes complicated to close the harmful gap 10 and the cost becomes high. That's not it.

The switch case 2 of this embodiment
Since it has the heat resistance described above, when a known flow solder method is used when soldering an electronic component or the like to the printed circuit board 7, there is no risk of melting and softening due to the melt solder, and the application of the flow solder method is possible. It will be possible.

The liquid crystal display device of the present invention is not limited to the above embodiment, and the switch case 2 may be provided with a mechanical switch.

[0015]

As described above, in the liquid crystal display device of the present invention, in which the frame-shaped switch case is mounted on the liquid crystal part and combined, the liquid crystal display device is present between the switch case and the peripheral part of the liquid crystal part. There is a practical effect that effectively shields the gap to improve visual quality and appearance quality, and can achieve them without complicating assembling workability and increasing cost.

[Brief description of the drawings]

FIG. 1 shows a liquid crystal display device of an embodiment of the present invention, (A)
Is a central longitudinal sectional view thereof, and (B) is a partial perspective view of the switch case.

2A and 2B show a conventional liquid crystal display device, in which FIG. 2A is a central longitudinal sectional view thereof, and FIG. 2B is a plan view thereof.

[Explanation of symbols]

 1 Liquid Crystal Part 2 Switch Case 3 LCD (Liquid Crystal Display) 4 Filter 5 Light Emitting Element 6 Light Sensing Element 7 Printed Circuit Board 8 Housing 9 Edge 10 Gap 13 Blind Plate 15 Cover Case 16 Receiving / Light Emitting Element Housing Recess 17 Filter Receptor 18 Dressing 19 Skirt board

Claims (2)

[Claims] 1. A liquid crystal display device in which a frame-shaped switch case having a switch device for the liquid crystal display is mounted and combined on the periphery of a liquid crystal part having a liquid crystal display as a main part. A skirt plate that is vertically installed in the switch case and is integrated with the switch case, and has a structure in which an entrance of a gap existing between the switch case and the liquid crystal unit in the combined state is shielded by the skirt plate. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the switch case integrally having the skirt plate is formed of a heat-resistant material having a solder melting temperature or higher.