JPH0322997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a display panel for a display device that improves workability and quality.

This type of display device, which is used for illuminating the operation panel of a car stereo, radio, etc., is useful and effective in improving visibility at night and further improving the interior of a car. This can be briefly explained using the conventional audio display device shown in FIGS. 1a, b, and c.
1 is a case, and 2 is a display plate that covers the front opening of the case 1. This display plate 2 is formed into a thin plate shape from a transparent synthetic resin material, and operation buttons 4 are arranged at predetermined locations on its surface. "AM", "FM",
A display section 3a that displays display characters such as "SW"...
A transparent portion 3b, an operation hole 3c, etc. are formed, and the other surfaces are subjected to a light-shielding treatment by hot stamping, silk printing, etc., thereby forming a light-shielding printed portion 3d in black or the like. . A light guide plate 5 is adhesively fixed to the back surface of the display panel 2 with a double-sided adhesive tape 6. The light guide plate 5 is integrally formed of an acrylic resin material with extremely excellent light transmittance and light conductivity, and internally reflects light guided from a light source (not shown). It is guided to the transparent part 3b. The light guide plate 5 and the adhesive tape 6 have through holes 7 and 7 corresponding to the operation holes 3c of the display plate 2, respectively.
8 are provided in advance, and holes 9 are formed in the adhesive tape 6 in correspondence with the display section 3a and the transparent section 3b. This poses a problem during assembly work. That is, the work of attaching the adhesive tape 6 to the display board 2 is performed on the display section 3a and the transparent section 3b.
Since it is difficult to completely match the operation hole 3c with the through holes 8 and 9, there is a large variation in quality due to misalignment. This takes a long time and reduces productivity.

Therefore, for example, if a plurality of adhesive tapes 6 divided into small pieces are pasted on the back side of the display board 2 as shown in FIG. 2, the punching work of holes can be eliminated and the misalignment during pasting can be eliminated. The work of pasting a plurality of adhesive tapes 6 requires a lot of man-hours, and has the drawback of poor workability and productivity.

The present invention has been made in view of the above-mentioned points, and includes providing a display section on the first display board, applying light shielding treatment to the other parts, and applying double-sided adhesive tape to the front and back surfaces of the second display board. Then, a through hole that is slightly larger than the display area of the first display board is formed in the second display board and the double-sided adhesive tape, and then the front and back surfaces of the second display board are bonded. To provide a method for manufacturing a display board of a display device, in which positional shift is prevented and quality and workability are improved by adhesively fixing the first display board and the light guide plate through the double-sided adhesive tape, respectively. It is something.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

FIG. 3 is a diagram for explaining the display board manufacturing method according to the present invention, in which 20 is a first display board, a display section 21 and an operation hole 22 are provided at predetermined locations on its surface, and other parts are provided. A light-shielding printing section 23 is provided by being subjected to light-shielding treatment. 24 is a second display board, and double-sided adhesive tapes 25 and 26 are adhered to the front and back surfaces of the second display board, respectively. The second display board 24 and the adhesive tapes 25 and 26 have portions corresponding to the display part 21 and the operation hole 22 of the first display board 20 that are slightly larger than the display part 21 and the operation hole 22. Through holes 27 and 28 are punched out. Reference numeral 29 denotes a light guide plate, and a hole 30 substantially identical to the through hole 28 of the second display plate 24 is punched out in the light guide plate 29 . and,
The first display board 20 and the second display board 24 are connected by one double-sided adhesive tape 25, and the second display board 2
4 and the light guide plate 29 with the other double-sided adhesive tape 26, these three parts are integrally joined, and then finished into a predetermined external shape by punching, and the display board can be manufactured. Complete.

Thus, according to such a display board manufacturing method, the adhesive tape 25,
26, since the through holes 27 and 28 have not yet been formed, the double-sided adhesive tape 25 can be continuously pressed onto the second display board 24 with a roller without worrying about misalignment. Easy to paste. Furthermore, since the through holes 27 and 28 are formed slightly larger than the display section 21 and the operation hole 22 to absorb positional deviations, high positioning accuracy is required for the work of joining the first display board 20 and the second display board 24. It's simple and easy. Therefore, the quality of the display board can be improved.

In addition, although the said Example demonstrated the case where the operation hole 22 was provided in the 1st display board 20, it is not limited to this and the display board of the display apparatus which does not have an operation button may be sufficient.

As explained above, the method for manufacturing a display board for a display device according to the present invention includes providing a display section on a first display board, applying a light shielding treatment to the other parts, and applying double-sided adhesive tape to the front and back surfaces of the second display board. Next, a through hole is formed in the second display board and the adhesive tape to correspond to the display part and is slightly larger than the above, and then the first display board and the second display board are bonded to the front and back surfaces of the second display board. Since the light guide plates are integrally joined using the adhesive tape, the through holes are not formed yet when the double-sided adhesive tape is attached to the second display plate, and therefore the second display plate is not formed. It can be glued to the entire front and back surfaces of the board without worrying about misalignment. Therefore, compared to the conventional method described above in which a double-sided adhesive tape with holes previously provided is integrally bonded to a display board with the holes and display part aligned,
In the present invention, the work of attaching the tape to the second display board is extremely simple and easy, and can be carried out in a short time, resulting in excellent workability and the number of display boards being reduced to one compared to conventional products.
Although this increases the cost, it can be compensated for by improved workability, and high-quality products with far less variation can be manufactured at a lower cost than conventional products. Also, the second
Since the through holes of the first display board are formed larger than the display part of the first display board, the through holes can absorb the positional deviation of both display boards when they are joined. It's very large.

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional audio display device, in which a is a perspective view of its external appearance, b is a sectional view showing the joint structure of a display board and a light guide plate, and c is an exploded perspective view of a display board and double-sided adhesive tape. FIG. 2 is a perspective view of a display board showing another method of applying double-sided adhesive tape, and FIG. 3 is a diagram showing an embodiment of the display board manufacturing method according to the present invention. 20...First display board, 21...Display section, 23
... Light-shielding printing section, 24 ... Second display board, 25,
26...Double-sided adhesive tape, 27, 28...Through hole,
29...Light guide plate.

Claims (1)

[Claims] 1. A display section is provided on the first display board, the other parts are subjected to light shielding treatment, double-sided adhesive tape is adhered to the front and back surfaces of the second display board, and then the second display board and the double-sided adhesive tape are attached. A slightly larger through hole is formed corresponding to the display area of the first display plate, and then the first display plate and the light guide plate are bonded on both sides of the front and back surfaces of the second display plate, respectively. A method for manufacturing a display board for a display device, characterized by adhesively fixing the display board through a tape.