Top Chassis Openings for Flexible Circuit Boards in Display Devices
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Solution Overview
Problem
In multi-display devices, the overlap of display panels and top chassis can cause damage to chip-on-film (COF) or tape carrier package (TCP) components due to weight and contact pressure, leading to increased non-display areas and potential damage.
Innovation Solution
The design includes a top chassis with openings or protrusions corresponding to flexible printed circuit boards, allowing for reduced contact pressure and minimizing the overlap area, and using a thin film cover for sealing, which can be made from materials like poly tetra fluoroethylene-based films or flame-retarding poly vinyl chloride films, to prevent damage and reduce non-display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel and top chassis are disposed in contact to minimize overlap area, then the non-display area is minimized, but damage occurs to the COF or TCP disposed between the display panel and top chassis
Solution Approach 1:
The top chassis is segmented by introducing openings at specific positions where the COF or TCP is located. This segmentation allows the flexible circuit board to pass through the top chassis without being compressed, thereby preventing damage while maintaining minimal overlap between the display panel and top chassis.
Solution Approach 2:
The harmful contact pressure is extracted by creating openings in the top chassis at the locations of the COF or TCP. This removes the damaging interaction between the top chassis and the flexible circuit board, allowing the circuit board to extend freely without compression or damage.
2Area of stationary object
If the top chassis covers the edge portion of the display panel to minimize non-display area, then the display efficiency is improved, but contact pressure damages the flexible printed circuit board
Solution Approach 1:
The top chassis is divided by creating openings at the positions where the flexible printed circuit board passes through. This segmentation prevents the top chassis from exerting continuous contact pressure on the circuit board, allowing it to bend and extend without damage while maintaining a compact overall structure.
Solution Approach 2:
The openings in the top chassis act as intermediaries that allow the flexible circuit board to pass through without direct contact with the solid chassis material. This mediator structure (the opening) enables the circuit board to maintain its flexibility and avoid damage from compression.
Data Source
AI summary
A display device includes: a display panel; a bottom chassis in which the display panel is accommodated; a driving circuit substrate disposed on an outside surface of the bottom chassis; at least one flexible printed circuit board connecting the display panel to the driving circuit substrate; and a top chassis configured to cover an edge portion of a top surface and side surfaces of the display panel, wherein the top chassis has an opening formed in an area in contact with the flexible printed circuit board.