JPS62269930A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent an EL element from being moved due to shock by forming a key to be engaged with both of the EL element arranged on the back of a liquid crystal display element and conductive rubber for electrically connecting the liquid crystal display element with an external circuit and engaging and fixing the key with them. CONSTITUTION:In the engaging part of the conductive rubber 13 with the EL element 14, a U-shaped member 17 having a groove 16 with a U-shaped section is formed unitedly with the inside of the rubber 13 or stuck to the rubber 13 by a bonding agent. The height of the groove 16 is set up so as to allow the thickness of the EL element 14 to be inserted. In addition, the key 18 is formed on a part (ungrooved part) of the groove 16 and a key 19 (cut part) is also formed on a position corresponding to the key 18 on the EL element 14 side. Since the keys 18, 19 formed on the EL element 14 and the rubber 13 are engaged with each other, the EL element 14 is rigidly fixed on a printed substrate 5 through the conductive rubber 13.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention C Industrial Application Field] The present invention relates to a liquid crystal display device, and is particularly characterized by a method for fixing an electroluminescent element for a backlight for a liquid crystal display element. The present invention relates to a liquid crystal display device having:

[Conventional technology]

As a light source for a liquid crystal display device, some methods have been adopted in which an electroluminescent (hereinafter referred to as EL element) is disposed behind the liquid crystal display element (for example, Japanese Patent Laid-Open No. 55-10
8620), when it is necessary to make the liquid crystal display device thinner, an EL element is simply inserted into the gap between the liquid crystal display element and the printed circuit board.

[Problem that the invention seeks to solve]

An EL element that is simply inserted into a gap between a liquid crystal display element and a printed circuit board and fixed only with electrical wiring leads easily moves when a light impact is applied to the liquid crystal display device. When the moved EL element collides with the conductive rubber (commonly known as zebra rubber, in which insulating layers and conductive layers are alternately laminated) held between the liquid crystal display element and the printed circuit board, this conductive rubber The rubber also moves, causing a problem of poor conduction between the liquid crystal display element and the drive circuit on the printed circuit board.

An object of the present invention is to provide a liquid crystal display device in which an EIJI element for a backlight of the liquid crystal display device does not move even if an impact is applied to the liquid crystal display device.

[Means for solving problems]

The problem mentioned above is that the S (key) is fitted into both the EL element, which is inserted behind the liquid crystal display element, and the conductive rubber for electrical connection, which is used to electrically connect the liquid crystal display element to an external circuit. ) and fit and fix the problem.

[Effect]

Even if a shock is applied to the liquid crystal display device, the EL element is fitted and fixed to the conductive rubber sandwiched between the printed circuit board and the liquid crystal display element, so the EL element will not wobble and the conductive rubber will not move. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a liquid crystal display element 1 includes a conductive rubber 4 (utilized in 1983), which is formed by laminating a conductive layer 2 and an insulating layer 3.
19981), and is mounted on a printed circuit board 5 and held down by a holder 6 from above. Note that the holder 6 is provided with a claw portion 7, which is inserted into a through hole 8 provided in the printed circuit board 5, and is crimped to fix the holder 6 and the printed circuit board 5. Electrode terminals (not shown) provided on the inner surface of the upper substrate 9 of the liquid crystal display element 1 are connected to the conductive rubber 4 and electrically connected to the circuit 10 formed on the printed circuit board 5. The electrode terminal 12 formed on the inner surface of the lower substrate 11 of the liquid crystal display element 1 is provided with a conductive rubber 1 having a structure similar to that of the conductive rubber 4.
3 is pressed by the holder 6. Therefore, the electrode terminal 12 is also connected to the circuit 10 on the printed circuit board 5 via the conductive rubber 13. An EL element 14 is inserted into the gap between the liquid crystal display element 1 and the printed circuit board 5, and is electrically connected to an EL element driving terminal 15 provided on the printed circuit board 5 by soldering. Further, the other end of the EL element 14 is fitted into the conductive rubber 13.

FIG. 2 is an enlarged view for explaining the structure of the fitting part between the conductive rubber 13 and the EL element 14. On the inside of the conductive rubber 13, a groove 16 is formed so that the cross section forms a U-shape. The provided U-shaped member 17 is formed integrally with the conductive rubber 13 or bonded to the conductive rubber 13 with an adhesive. The height of this groove 16 is such that the thickness of the EL element 14 can be inserted therein. Further, a key 18 is formed in a part of the groove 16 (in the figure, the part where the groove is not formed), and on the other hand, a key 19 (in the figure) is formed at a corresponding position on the EL element 14 side. There is. Therefore, the EL element 14
Since the keys 18 and 19 formed on the conductive rubber 13 and the conductive rubber 13 fit together, the EL element 14 is firmly fixed to the printed circuit board 5 via the conductive rubber 13.

FIGS. 3 and 4 show other embodiments, and FIG. 3 shows a case where key parts 18 and 19 are provided at a plurality of locations, and FIG. 4 shows a case where keys 18 are provided at both ends.

〔Effect of the invention〕

According to the present invention, even if an impact is applied to the liquid crystal display device, the E
The L element never moves.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIGS. 3 and 4, which are partially enlarged portions, are perspective views showing other embodiments of the present invention. 1... Liquid crystal display element, 4, 13... Conductive rubber, 5.
...Printed board, 9...Upper board, 11...Lower board, 12...Electrode terminal, 14...EL element, 16
...Groove, 17...U-shaped member, 18.19...Key.

Claims (1)

[Claims] 1. A liquid crystal display that is equipped with an electroluminescent element as a light source for illumination, and electrically connects the liquid crystal display element and the circuit on the printed circuit board by interposing conductive rubber between the liquid crystal display element and the printed circuit board. 1. A liquid crystal display device, characterized in that an electroluminescent element disposed behind the liquid crystal display element and the conductive rubber are fixed by a key that fits together with the electroluminescent element.