JP2600578Y2 - Liquid crystal display - Google Patents

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 having a metal frame.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device, as shown in Japanese Patent Application Laid-Open No. 3-194515, a driving element is arranged and connected to a peripheral portion of a liquid crystal cell, and the liquid crystal cell is mounted on a supporting frame or a lighting device. Together with a metal front frame, and a back plate covers the back of the front frame. In this case, the fixing of the frame body is only to bend the nail on the frame frame or the like and lock it on the front frame for convenience of removal, and the back plate is screwed to the lighting device or the frame frame or the like. Was.

[0003]

However, in driving the liquid crystal cell, it is understood that pulse signals are handled, and that the liquid crystal itself may cause alignment unevenness of liquid crystal molecules due to static electricity or the like, and this is shielded. However, since a metal frame is used, grounding is merely performed by using a fixing claw or the like, resulting in poor contact or unstable potential of the back plate.

Accordingly, as disclosed in Japanese Utility Model Laid-Open No. 2-148128, when mechanical strength is insufficient only by contacting a metal front frame or a back plate with a ground wiring of a circuit board, soldering is performed. However, there is a problem in that workability is poor because soldering is required on the front and back surfaces of the circuit board, and disassembly workability in performing repair or the like is poor.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of improving the workability of attaching a metal front frame and a back plate and also improving the workability of disassembly during repair. It is another object to secure the connection between the front frame and the ground.

[0006]

According to the present invention, there is provided a liquid crystal display device comprising: a liquid crystal cell; a frame supporting the liquid crystal cell; a substrate having a ground portion and screwed to the back of the frame; A metal front frame connected to the grounding portion of the substrate by a claw while accommodating the liquid crystal cell against the frame via a cushioning material; and a grounding portion of the substrate disposed on the back surface of the liquid crystal cell. A back plate made of metal having a tongue piece that abuts on the back surface, wherein the front frame is electrically connected to the ground portion by rotating its claw on the back side of the frame body, The face plate is characterized in that the tongue piece and the substrate are fixed to the frame by fastening together on the back side of the frame.

[0007]

As described above, the front frame and the back plate are fixed to the grounding portion of the board by using both caulking and screws which are excellent in disassembling workability, thereby improving repair workability. be able to. Furthermore, since the caulking and screwing positions are unified on the back side of the frame, the workability of assembly can be improved. Furthermore, due to the presence of the cushioning material between the front frame and the liquid crystal cell, the connection state of the claws of the front frame locked to the substrate on the back of the frame can be reliably maintained.

[0008]

FIG. 1 is a sectional view of an essential part of a liquid crystal display device according to an embodiment of the present invention. The upper right extension of FIG. 1A and the upper extension of FIG. 1B are integrated via a central portion (not shown). I have. In the figure, reference numeral 1 denotes a liquid crystal cell to which a driving element 2 is connected, for example, a twisted nematic (TN) in which a liquid crystal is sandwiched between glass substrates,
It has a display mode such as super twisted nematic (STN), and a polarizing plate or a phase plate is attached to the front and back surfaces as necessary.

The drive element 2 is, for example, an integrated circuit of a film carrier type. The drive element 2 is directly connected to the periphery of the liquid crystal cell by an anisotropic conductive adhesive or solder, and a signal line is connected by a printed board or a flexible board. To the substrate 3 having the portion. The substrate 3 has a substantially rectangular shape made of, for example, a glass epoxy substrate, and is provided with wide grounding portions on both sides. The grounding portions are subjected to solder plating or the like as necessary. There is a through hole for fixing the screw.

Reference numeral 4 denotes such a liquid crystal cell 1, a driving element 2,
Alternatively, it is a frame body for supporting or storing the illumination means 5 composed of the light guide plate 51 and the cold cathode tube, made of a resin molded product or the like, and having a window (through hole) at the center as shown in FIG. A screw hole 41 for fixing the housing portion of the substrate 3 and the substrate is provided on the side, and a thin portion 42 is provided on the other side for driving the cold-cathode tube as necessary. The illumination drive circuit 6 including an inverter circuit and the like is configured to be housed. Conventionally, the liquid crystal display device (module) and the illumination drive circuit 6 are separately housed in a device such as a personal computer. However, as the size of the device is reduced, it becomes difficult to arrange the illumination drive circuit. Focusing on the fact that the shape of the illumination drive circuit is composed of a high transformer section and a low component mounting section, a space is secured on the back surface of the drive element 2 and the illumination drive circuit 6 The low component mounting portion can be arranged on the back of the liquid crystal display device.

Reference numeral 7 denotes a housing for accommodating the liquid crystal cell 1 and a claw 71 for locking.
Is rotated on the back side of the frame body 4 to be locked on the grounding portion of the substrate 3, and at the same time, the liquid crystal cell 1 is Is housed so as to be pressed against the frame 4, so that the claw 71 is securely connected to the grounding portion. Reference numeral 8 denotes a metal back plate disposed on the back of the liquid crystal cell 1 so as to support the light guide plate 51. As shown in FIG.
The tongue piece 81 is fixed to the screw hole 41 of the frame 4 together with the substrate 3 on the rear side of the frame 4 together.

As described above, both the front frame 7 and the rear plate 8 have substantially the same potential with respect to the ground potential (signal ground) of the drive element 2 by using both the caulking and the screw stop which are excellent in disassembling workability in the ground portion. The connection is made, and the contact failure is almost eliminated by the surface contact. Furthermore, since the caulking and screwing positions are unified on the back side of the frame, the workability of assembly can be improved. Furthermore, due to the presence of the cushioning material between the front frame and the liquid crystal cell, the connection state of the claws of the front frame locked to the substrate on the back of the frame can be reliably maintained.

[0013]

As described above, since the liquid crystal cell and the driving element are reliably covered with the ground potential, it is possible to provide a liquid crystal display device with less display defects and noise radiation due to static electricity. further,
A liquid crystal display device with good assembling and disassembling workability can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view a of a left main part of a liquid crystal display device according to an embodiment of the present invention.
FIG.

FIG. 2 is a rear view of the frame according to the present invention.

FIG. 3 is a rear view of the rear plate according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal cell 2 Drive element 3 Substrate 4 Frame 5 Lighting means 6 Lighting drive circuit 7 Front frame 8 Back plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1333 G02F 1/1345

Claims (1)

(57) [Scope of request for utility model registration] And 1. A liquid crystal cell, the frame for supporting the liquid crystal cell
If, screwed to the back of the frame and having a A over scan portion
A substrate to be fit, the frame via a cushioning material to the liquid crystal cell
Metal having a metallic front frame connected by claw to the ground portion of the substrate, the abutting tongue disposed on the back to the ground portion of the substrate of the liquid crystal cell with housing so as to press the body ; and a manufacturing of the back plate, the front frame
By rotating the claw on the back side of the frame,
The back plate is electrically connected to the ground part,
The tongue piece and the substrate are attached to the frame at the back side of the frame.
A liquid crystal display device characterized by being fixed by tightening .