Chip-on-Film Pad Layout for Flexible Display Alignment
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Solution Overview
Problem
Flexible display panels face misalignment and circuit breaks during the COF binding process due to size changes, affecting product yield and reliability.
Innovation Solution
The arrangement of output and input pads on the chip-on-film and flexible display panel, respectively, with virtual extension lines inclined at angles intersecting at a common point, allows for adjustable alignment and secure binding, even with size changes, ensuring correct alignment and improved binding yield and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the flexible display panel is made thin to achieve flexibility and lightweight advantages, then the flexibility and portability are improved, but the panel becomes sensitive to size changes during the COF binding process, leading to misalignment and circuit breaks
Solution Approach 1:
The pad layout is designed to be dynamically adaptable to size changes. The triangular arrangement with converging virtual extension lines allows the pad positions to naturally accommodate dimensional variations during binding, transforming the static alignment problem into a dynamic solution that works with size changes rather than against them
Solution Approach 2:
The pad arrangement uses asymmetric triangular geometry where virtual extension lines converge to a common point. This asymmetric configuration provides inherent alignment tolerance, as the converging lines create a focal point that maintains pad correspondence even when the panel dimensions vary during the binding process
2Adaptability or versatility
If the output pads are arranged densely to increase functionality, then the device capability is improved, but the pads become more sensitive to size changes, increasing the risk of misalignment and circuit breaks
Solution Approach 1:
The solution moves from considering only linear pad spacing to a two-dimensional triangular arrangement. By organizing pads in triangles with converging virtual extension lines, the system gains an additional geometric dimension for alignment tolerance, allowing dense functional integration while maintaining binding reliability through the triangular geometric constraint
Data Source
AI summary
The present disclosure provides a chip-on-film, a flexible display panel and a display device. The COF includes a plurality of output pads independent of each other. The plurality of output pads are disposed at a side of the substrate and are arranged in at least one row in the first direction. Virtual extension lines of all the output pads intersect at the same intersecting point on the base line. The flexible display panel includes a plurality of input pads independent of each other. The plurality of input pads are disposed in the binding region and are arranged in at least one row in the first direction. Virtual extension lines of all the input pads intersect at the same intersecting point on the base line.