Anisotropic Conductive Film Extension for LCD Wiring Protection
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with disconnection and electrical shorts due to bending stress on flexible wiring boards and exposure of wiring patterns, leading to increased manufacturing costs and reduced bond strength between the liquid crystal panel and flexible wiring board, especially as housing sizes decrease.
Innovation Solution
The solution involves using an anisotropic conductive film that extends from the formation area of external connection terminals to the outside area along the flexible wiring board, with a chamfered edge on the liquid crystal panel to prevent direct contact and exposure of the wiring pattern, and a thermo-compressing method to secure the connection, ensuring complete coverage and enhanced bond strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible wiring board is made thin to reduce device size, then the device becomes more compact, but the wiring pattern becomes disconnected due to bending stress
Solution Approach 1:
The anisotropic conductive film is extended in advance from the external connection terminal formation area along the flexible wiring board to the outside area, creating a protective coverage before bending stress occurs. This preliminary extension ensures that when the wiring board bends during assembly or operation, the conductive particles maintain continuous paths and prevent disconnection of the wiring pattern.
2Ease of operation
If the wiring pattern is exposed at the end of the flexible wiring board to enable connection, then connection is possible, but the exposed wiring pattern shorts due to adhesion of conductive foreign body
Solution Approach 1:
The anisotropic conductive film is extended beforehand to cover the outside area of the flexible wiring board where the wiring pattern would be exposed. This preliminary coverage creates a protective barrier that prevents conductive foreign bodies from adhering to the wiring pattern and causing electrical shorts, while still allowing the wiring board to be connected to external terminals.
3Ease of manufacture
If the anisotropic conductive film is stuck only to the formation area of external connection terminals, then the connection process is simple, but the bond strength is insufficient under bending stress
Solution Approach 1:
The anisotropic conductive film is extended from the traditional limited area at the terminal formation region to include the outside area along the flexible wiring board. This dimensional extension increases the contact area between the conductive film and the wiring board, thereby enhancing bond strength and tolerance to flexural stress while maintaining a relatively simple manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents disconnection and electrical shorts by covering the wiring pattern and increasing the contact area, thereby enhancing the bond strength and tolerance to flexural stress between the liquid crystal panel and flexible wiring board.
Implementation Method 1
The anisotropic conductive film is thermosetting resin film, in which conductive particles are dispersed
Implementation Method 2
a thermo-compressing method to secure the connection
Data Source
AI summary
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.