JPH10104584A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high reliability device reducing or eliminating noise radiation and soling an environmental problem caused by a radio wave by coating electronic parts formed on a printed circuit board with an insulative resin layer, providing a conductive thin body such as a metal foil, etc., on the insulative resin layer and grounding the conductive thin body. SOLUTION: The printed circuit board 3 is arranged side by side on a pair of stuck glass substrates 6, 7, and protection resin 9a as the insulative resin layer is applied to various electronic equipments and a driver IC provided on the printed circuit board 3 as shown by a slash area in figure to be coated. Then, the metal foil 13 such as a copper foil tape, etc., as the conductive thin body is stuck onto this protection resin 9a, and thus, the matter that the metal foil 13 is short-circuited with various electronic parts, etc., is prevented. Then, further, the metal foil 13 is grounded. In such a manner, the noise radiation caused by various electronic parts and the driver IC is suppressed by the metal foil 13.

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 mounted on a device such as a personal computer.

[0002]

2. Description of the Related Art FIG. 3 is an exploded perspective view of a conventional liquid crystal display device 1, in which reference numeral 2 denotes a liquid crystal panel, and reference numeral 3 denotes a printed circuit board arranged in parallel with the liquid crystal panel 2. They are integrally held by the face board 4 and the back board 5.

FIG. 4 is an enlarged front view of the vicinity of the connection between the liquid crystal panel 2 and the printed circuit board 3, and the printed circuit board 3 is juxtaposed on a pair of glass substrates 6 and 7 bonded together. Various electronic components 8 are provided on the printed circuit board 3, and a protective resin 9 covering a driver IC (not shown) is applied to portions close to the glass substrates 6 and 7 as shown by hatched areas. I have. Reference numeral 10 denotes a ground land terminal.

[0004]

In recent years, noise generated by electronic equipment has become a problem, and it is necessary to reduce the radiation of unnecessary noise in liquid crystal display devices as much as possible. The electronic component 8 on the printed circuit board 3 is usually a source of this noise radiation.

However, since the conventional liquid crystal display device 1 is electromagnetically shielded only by the face board 4 and the back board 5, it is insufficient in terms of reducing noise radiation.

Accordingly, an object of the present invention is to provide a highly reliable liquid crystal display device which further reduces or eliminates noise radiation and solves the environmental problem caused by electromagnetic waves.

[0007]

A liquid crystal display device according to the present invention comprises a liquid crystal panel and a printed circuit board disposed around the liquid crystal panel. The electronic component formed on the printed circuit board is formed of an insulating resin. A conductive thin body such as a metal foil is provided on the insulating resin layer, and the conductive thin body is grounded.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a liquid crystal display device 11 according to the present invention, as shown in FIG.
a is integrally held between the face board 4 and the back board 5. The invention is further illustrated in FIGS.
This will be described below.

FIG. 1 is an enlarged front view of the vicinity of the connection between the liquid crystal panel 2 and the printed circuit board 3a of the liquid crystal display device 11 of the present invention, and FIG. 2 is a schematic diagram of a personal computer 12 on which the liquid crystal display device 11 is mounted. The same parts as those of the conventional liquid crystal display device 1 are denoted by the same reference numerals.

According to FIG. 1, a printed circuit board 3a is juxtaposed on a pair of glass substrates 6 and 7 bonded together, and various electronic components 8 and a driver IC provided on the printed circuit board 3a are provided.
(Not shown) to the protective resin 9a as the insulating resin layer (for example, KCS18C, KCS19D manufactured by Hitachi Chemical Co., Ltd.).
Epoxy electrical insulating resin) is applied and covered as shown by the shaded area. Then, a metal foil 13 such as a copper foil tape as the conductive thin body is adhered on the protective resin 9a so that the metal foil 13 does not short-circuit with various electronic components 8 or the like. Further, the metal foil 13 is grounded.

As for the grounding of the metal foil 13, the metal foil 13 is brought into contact with the ground land terminal 10. Thereby, the ground can be further strengthened.
In order to further improve the reliability, it is better to perform soldering.

On the other hand, a lug terminal 14 is soldered to the metal foil 13, and the lug terminal 14 is put out of a gap between a connector insertion hole provided in the face board 4 as an exterior case and the back board 5, and FIG. It is connected to the ground 15 of the personal computer 12 as shown.

Thus, in the liquid crystal display device 11 of the present invention, since the noise radiation by the various electronic components 8 and the driver IC is suppressed by the metal foil 13, the radiation of the noise of about several dB to 10 dB as compared with the related art is achieved. Was reduced.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements may be made without departing from the scope of the present invention. For example, in the above-described embodiment, the mounting on the personal computer 12 has been described, but it may be mounted on a device such as a monitor or a fax. Although the case where the metal foil 13 such as the copper foil tape as the conductive thin body is applied is shown, a conductive paste may be applied or a metal layer may be attached by vapor deposition.

[0015]

As described above, according to the present invention, an electronic component formed on a printed circuit board juxtaposed to a liquid crystal panel is covered with an insulating resin layer, and a conductive thin film such as a metal foil is formed on the insulating resin layer. By providing the body and grounding the conductive thin body, noise radiation was further reduced or eliminated, thereby providing a highly reliable liquid crystal display device that solved the environmental problem caused by electromagnetic waves.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of the vicinity of a connection between a liquid crystal panel and a printed circuit board in a liquid crystal display device of the present invention.

FIG. 2 is a schematic diagram of a personal computer equipped with the liquid crystal display device of the present invention.

FIG. 3 is an exploded perspective view in which the liquid crystal display device is held by an outer case.

FIG. 4 is an enlarged front view near a connection between a liquid crystal panel and a printed circuit board in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Liquid crystal display device 2 Liquid crystal panel 3, 3a Printed circuit board 4 Faceboard 5 Backboard 6, 7 Glass substrate 8 Electronic component 9, 9a Protective resin 10 Ground land terminal 12 Personal computer 13 Metal foil 14 Lug terminal

Claims (1)

[Claims] 1. A liquid crystal panel comprising a liquid crystal panel and a printed circuit board disposed around the liquid crystal panel. Electronic components formed on the printed circuit board are covered with an insulating resin layer, and a conductive film is formed on the insulating resin layer. A liquid crystal display device provided with a thin body and the conductive thin body is grounded.