Liquid crystal display device and manufacturing method thereof

Abstract

A liquid crystal display device of the present invention prevents certainly disconnection and electrical short of a wiring pattern of a flexible wiring board, and enhances bond strength between a liquid crystal panel and the flexible wiring board. A liquid crystal panel is provided with substrates, a liquid crystal and external connection terminals formed on one substrate. A flexible wiring board includes a wiring pattern connected with the external connection terminals of the liquid crystal panel. An anisotropic conductive film electrically connects between the external connection terminals of the liquid crystal panel and the wiring pattern of the flexible wiring board. And the anisotropic conductive film is extended from a formation area of the external connection terminals to an outside area along the flexible wiring board.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other exemplary features, and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings wherein:

FIG. 1 is a cross-sectional pattern diagram showing an exemplary embodiment of a connection structure bonding a liquid crystal panel and a flexible wiring board in a liquid crystal display device according to the present invention;

FIG. 2 is a cross-sectional diagram showing a status before hot-pressing in a liquid crystal display device shown in FIG. 1;

FIG. 3 is a cross-sectional diagram showing a connection method at time of hot-pressing in a liquid crystal display device shown in FIG. 1;

FIG. 4 is a cross-sectional diagram showing another exemplary embodiment of a connection method at the time of hot-pressing bonding a liquid crystal panel and a flexible wiring board in a liquid crystal display device according to the embodiment;

FIG. 5 is a cross-sectional diagram showing a connection method in case of no chamfer in the embodiment shown in FIG. 4;

FIG. 6 is a cross-sectional diagram showing a connection structure bonding a liquid crystal panel and a flexible wiring board in a conventional liquid crystal display device; and

FIG. 7 is a sectional pattern diagram showing a connection method at the time of hot-pressing in a liquid crystal display device shown in FIG. 6.

Claims

1. A liquid crystal display device comprising: a liquid crystal panel which is provided with a substrate, a liquid crystal and external connection terminals formed on the substrate;a flexible wiring board which includes a wiring pattern connected with the external connection terminals of the liquid crystal panel;a chamfer which is formed outside the formation area of the external connection terminals in a periphery of the substrate, andan anisotropic conductive film which electrically connects between the external connection terminals of the liquid crystal panel and the wiring pattern of the flexible wiring board,

2. The liquid crystal display device according to claim 1, further comprising, an insulating protection film coated on the flexible wiring board to keep a predetermined distance from an edge of the liquid crystal panel,

3. The liquid crystal display device according to claim 2,

4. The liquid crystal display device according to claim 1,

5. A manufacturing method for connecting a flexible wiring board in a liquid crystal display device, comprising: setting a liquid crystal panel which is provided with a substrate, a liquid crystal and external connection terminals formed on the substrate;sticking an anisotropic conductive film on a formation area of the external connection terminals;attaching a flexible wiring board on the anisotropic conductive film at position aligned with the external connection terminals of the liquid crystal panel;attaching a cushioning on the flexible wiring board;setting a hot-pressing tool above the cushioning; andthermo-compressing to a stuck area of the anisotropic conductive film by using the hot-depressing tool,

6. A manufacturing method according to claim 5, further comprising, coating an insulating protection film on the flexible wiring board to keep a predetermined distance from an edge of the liquid crystal panel,

7. A manufacturing method according to claim 6,

8. A manufacturing method according to claim 5, further comprising, forming a chamfer outside the formation area of the external connection terminals in a periphery of the substrate,

9. A manufacturing method for connecting a flexible wiring board in a liquid crystal display device, comprising: setting a liquid crystal panel which is provided with a substrate, a liquid crystal and external connection terminals formed on the substrate;sticking an anisotropic conductive film on a formation area of the external connection terminals;attaching a flexible wiring board on the anisotropic conductive film at position aligned with the external connection terminals of the liquid crystal panel;attaching a cushioning on the flexible wiring board;setting a hot-pressing tool above the cushioning at inside the liquid crystal panel;setting a pressing tool the cushioning at outside the liquid crystal panel; andthermo-compressing to a stuck area of the anisotropic conductive film,

10. A manufacturing method according to claim 9,

11. A manufacturing method according to claim 9, further comprising, coating an insulating protection film on the flexible wiring board to keep a predetermined distance from an edge of the liquid crystal panel,

12. A manufacturing method according to claim 11,

13. A manufacturing method according to claim 9, further comprising, forming a chamfer outside the formation area of the external connection terminals in a periphery of the substrate,