Display Panel Backside FPCB Layout for Narrow Bezel Design
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Solution Overview
Problem
The existing display panels have a limited reduction in non-display area due to the presence of wiring members such as tape carrier packages or flexible printed circuit boards, which occupy additional space and restrict the minimization of non-display areas.
Innovation Solution
The display panel design includes an array substrate with a thin film transistor, pixel electrode, and signal input pad connected through a flexible printed circuit board, where the signal input pad is supported by an organic polymer pattern and disposed on the lower surface, allowing for a reduced pad area and minimizing the need for extra space, thus reducing the non-display area by integrating the wiring under the array substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring members such as tape carrier packages or flexible printed circuit boards are attached to the display panel, then electrical connection between the display panel and external circuit module is achieved, but the non-display area increases due to the space occupied by the wiring member
Solution Approach 1:
The patent moves the wiring member from the front surface (2D plane) to the back surface (another dimension) of the display panel. The flexible printed circuit board is attached to the back surface of the array substrate, allowing electrical connections to be made without occupying space on the front display surface, thus reducing the non-display area while maintaining connectivity.
Solution Approach 2:
The wiring member (flexible printed circuit board) is nested within the space behind the array substrate. By positioning the FPCB in the non-display area on the back surface and using a thru-hole configuration, the wiring is effectively hidden within the existing structural envelope of the display panel, eliminating the need for additional front surface space.
2Area of stationary object
If the pad area is reduced to minimize non-display area, then the aesthetic appeal and display efficiency improve, but the complexity of electrical connection increases
Solution Approach 1:
The connection complexity is resolved by moving to the back surface dimension. The FPCB is routed through a thru-hole in the array substrate and connected to pads on the back surface, allowing reduced front surface pad area while maintaining all necessary electrical connections through the alternative spatial dimension.
Data Source
AI summary
A display panel includes an array substrate, an opposite substrate facing the array substrate, and a liquid crystal layer disposed between the array substrate and the opposite substrate. The array substrate includes a display area and a non-display area surrounding the display area, and the non-display area includes a first non-display area disposed adjacent to a side portion of the display area and a second non-display area other than the first non-display area. The first non-display area overlaps the opposite substrate. The array substrate and the opposite substrate have the same or substantially the same area and a wire member is disposed under the array substrate to be connected to an external circuit module. Accordingly, the display panel does not need an extra space for the wire member, and thus the non-display area is reduced.