In-Cell Touch Display Panel Segmented Redundant Signal Routing
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Solution Overview
Problem
In-cell touch display panels face challenges with wide frames and complex routing of redundant signal lines, especially for special-shaped products, due to excessive redundant signal lines and reduced pixel aperture ratio.
Innovation Solution
The design includes a common electrode layer with independent electrode blocks, where touch signal lines and redundant signal lines are electrically connected in a time-sharing manner, with redundant signal lines disconnected between blocks to form sub-conductive lines, allowing for narrow frames and efficient signal transmission, and are disposed in different layers to avoid blind touch areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If redundant signal lines are continuously connected across electrode blocks, then signal transmission is simplified, but frame width increases and routing complexity increases for special-shaped products
Solution Approach 1:
The redundant signal lines are segmented into multiple redundant sub-conductive lines by disconnecting portions between adjacent electrode blocks. Each redundant sub-conductive line corresponds to one electrode block and is electrically connected only to that block, transforming a single continuous line into multiple discrete segments that can be independently routed.
Solution Approach 2:
Different regions of the redundant signal lines have different connectivity characteristics: portions within electrode blocks remain connected to provide local redundancy, while portions between adjacent blocks are disconnected to reduce frame width and simplify routing. This creates localized connectivity patterns optimized for different functional requirements.
2Adaptability or versatility
If common electrode layer is multiplexed as touch electrode for time-sharing driving, then device integration is improved, but electrode resistance increases
Solution Approach 1:
The common electrode layer is segmented into multiple independent electrode blocks, each with its own touch signal line and redundant sub-conductive lines. This segmentation allows each block to be independently driven and reduces the overall resistance by creating multiple parallel conduction paths through the redundant sub-conductive lines connected to each block.
Data Source
AI summary
A display panel includes: a first substrate and a second substrate oppositely disposed; and a common electrode layer, a plurality of touch signal lines and a plurality of redundant signal lines disposed on a side of the first substrate facing the second substrate. The common electrode layer comprises a plurality of electrode blocks independent from each other; the plurality of touch signal lines extend in a first direction and correspond to the plurality of electrode blocks in one-to-one correspondence, and the plurality of touch signal lines are electrically connected to the corresponding electrode blocks, respectively; and the plurality of redundant signal lines extend in the first direction, wherein respective portions of each of the redundant signal lines located between adjacent ones of the plurality of electrode blocks in the first direction are disconnected to form redundant sub-conductive lines corresponding to each of the plurality of the electrode blocks, and the redundant sub-conductive lines are electrically connected to corresponding electrode blocks, respectively.