JPH11183926A - Installation structure of foil earth wire in liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a production efficiency of a liquid crystal display device by eliminating man-hours for inspecting flaking and positional deviation of a metal foil earth wire used for a liquid crystal display device. SOLUTION: Projections 12 are provided on a pressurizing-use flat part 5 of a metal casing 8 of a liquid crystal display device, and since flaking and positional deviation caused by environmental changes are prevented from occurring by pressurizing a bonding part 10 of a metal foil earth line 1 on a bonding- use flat part 4 with the pressurizing-use flat part 5 and persistently fixing the bonding part 10 of the earth line 1 by the projections 12, this reduces inspection man-hours before shipment associated with the flaking and positional deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a foil ground wire in a liquid crystal display device.

[0002]

2. Description of the Related Art Generally, in a liquid crystal display device, a drive circuit thereof and a metal casing are connected to each other by a metal-made foil-like ground wire.

Conventionally, as shown in FIG. 2, this ground wire mounting structure is such that one end of a ground wire 1 is soldered to a printed circuit board 2 constituting a drive circuit, and the other end of the ground wire 1 is a resin casing. 3 is adhered to the flat portion 4 of the resin casing 3 with an adhesive 6 and the flat portion 5 of the metal casing 8 is pressed against the flat portion 4 of the resin casing 3.
Will be interposed.

[0004]

Incidentally, the linear expansion coefficients of the resin casing 3 and the ground wire 1 due to temperature changes are different. However, in the conventional structure for mounting the ground wire 1 of the liquid crystal display device, the other end of the ground wire 1 is adhered to the flat portion 4 of the resin casing 3 with an adhesive 6 and the flat portion 4 of the resin casing 3 is Since only the flat portion 5 of the casing 8 is pressed against the housing, the earth wire 1 is peeled off and displaced due to a change in the environmental temperature during storage after production of the liquid crystal display device 7 and transportation after shipment.
This may cause an increase in man-hours and a decrease in quality (return after shipment) due to re-inspection of the inventory before shipment.

Therefore, an object of the present invention is to provide a ground wire mounting structure that can solve the above-mentioned problems.

[0006]

Means for solving the problems of the present invention include a printed circuit board constituting a drive circuit, a resin casing disposed adjacent to the printed circuit board, and one end electrically connected and fixed to the printed circuit board. And a metal casing that covers the printed circuit board and the resin casing via the ground wire, and a foil-like ground wire that serves as a connecting portion and the other end is a sticking portion that is stuck to the sticking flat portion of the resin casing. The metal casing is provided with a pressing flat portion for pressing the ground wire against the flat portion of the resin casing, and the ground wire is attached to the flat portion of the pressing flat portion. A projection is provided for firmly fixing the flat part.

The projection is formed integrally with the pressing flat portion by processing a part of the pressing flat portion, the tip portion is formed at an acute angle, and is orthogonal to the flat surface of the pressing flat portion. It is arranged in the direction to be.

[0008] In the above configuration, the foil-shaped ground wire is forcibly held by the projection provided on the pressing flat portion of the metal casing, so that separation and displacement of the ground wire due to a change in environmental temperature can be prevented. This eliminates the need for inspection for peeling and displacement of the ground wire, thereby improving productivity and improving product quality and stabilizing the quality.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on a perspective view of FIG. The mounting structure of the foil-like ground wire 1 in the liquid crystal display device 7 according to the embodiment of the present invention includes a printed circuit board 2 constituting a drive circuit, and a resin casing 3 disposed adjacent to the printed circuit board 2.
And a metal casing 8 that covers the printed circuit board 2 and the resin casing 3 via the ground wire 1.

One end of the ground wire 1 is connected to a printed circuit board 2
A connecting portion 9 electrically connected and fixed to the connecting portion 9 by soldering, and the other end is a sticking portion 10 stuck to the sticking flat portion 4 of the resin casing 3 with an adhesive 6. The connecting portion 10 is continuous with the connecting portion 11.

The metal casing 8 is provided with a pressing flat portion 5 for pressing the attaching portion 10 of the ground wire 1 against the attaching flat portion 4 of the resin casing 3. 5 is provided with projections 12 for firmly pressing and fixing the ground wire 1 to the flat portion 4 to be attached.

Further, slit-shaped notches 13, 13 are formed in the pressing flat portion 5 in a direction orthogonal to the plane thereof, and the side portions along the respective notches 13, 13 are attached to each other. The protrusions 12 are formed so as to be driven into the flat portion 4 side, and the protrusions 12 are integrally protruded from the sticking flat portion 4 side (back surface side) of the pressing flat portion 5.

Each of the projections 12 has an acute angle at its tip, and the tip of each projection 12 is oriented in a direction orthogonal to the plane of the pressing flat portion 4. ing.

The fixing flat portion 4 and the pressing flat portion 5 are provided with fixing holes 4a and 5a through which fasteners (not shown) such as screws are inserted. In the above configuration, the connection portion 9 of the ground wire 1 is soldered to the printed circuit board 2, the continuous portion 11 of the ground wire 1 is made to extend along the resin casing 3, and the sticking portion 10 of the resin casing 3 is attached to the sticking flat portion 4. Adhering with the adhesive 6. Then, the printed board 2 and the resin casing 3 are covered with the metal casing 8 in which the projections 12 and 12 are formed on the pressing flat portion 5 in advance,
The metal casing 8 is fixed to the resin casing 3. Then, the protrusions 12 formed on the pressing flat portion 5,
The ground wire 1 is tightly pressed against the sticking flat part 4, and is securely fixed to the sticking flat part 4.

Therefore, even if the coefficient of linear expansion due to the temperature change of the resin casing 3 and the ground wire 1 is different, and if the environmental temperature changes during storage after production of the liquid crystal display device 7 and transportation after shipment, Since the ground wire 1 is fixed to the flat portion 4 to be adhered by the projections 12 and 12, the peeling and displacement of the ground wire 1 can be reliably prevented, thereby suppressing an increase in man-hours due to re-inspection before shipment of the stock. In addition, it is possible to prevent the quality of the liquid crystal display device 7 from deteriorating.

[0016]

As is apparent from the above description, according to the present invention, the metal casing is provided with a pressing flat portion for pressing the foil-like ground wire against the flat portion of the resin casing. Since the projections for firmly fixing the grounding wire to the flattening part are provided on the flattening side of the pressing flat part, the temperature variation between the resin casing and the grounding wire can be reduced. Even if the coefficient of linear expansion is different and the environmental temperature changes during storage after production of the liquid crystal display device and transportation after shipment, the ground wire is fixed to the flat part to be adhered by the projection, and the peeling and position of the ground wire The displacement can be reliably prevented, the man-hours required for re-inspection before shipment of the product can be reduced, the productivity efficiency can be improved, and the deterioration of the quality of the liquid crystal display device can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part of a liquid crystal display device showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foil-like ground wire 2 Printed circuit board 3 Resin casing 6 Adhesive material 4 Adhering flat part 5 Pressing flat part 8 Metal casing 12 Projection

Claims (4)

[Claims] 1. A printed circuit board forming a drive circuit, a resin casing disposed adjacent to the printed circuit board, one end serving as a connection portion electrically connected and fixed to the printed circuit board, and the other end provided with the resin casing. A liquid-crystal display device comprising: a foil-like ground wire serving as an attachment portion attached to a flat attachment portion; and a metal casing that covers a printed board and a resin casing via the earth wire. Is provided with a pressing flat portion for pressing the ground wire against the flat portion of the resin casing, and the ground wire is firmly fixed to the sticking flat portion on the sticking flat portion side of the pressing flat portion. Mounting structure for a foil-like ground wire in a liquid crystal display device, wherein projections are provided. 2. A mounting structure for a foil-like ground wire in a liquid crystal display device according to claim 1, wherein the projection has a tip portion formed at an acute angle. 3. A foil shape in the liquid crystal display device according to claim 1, wherein the projection is formed integrally with the pressing flat portion by processing a part of the pressing flat portion. Ground wire mounting structure. 4. The foil ground wire in a liquid crystal display device according to claim 1, wherein the projections are arranged in a direction orthogonal to a plane of the pressing flat portion. Mounting structure.