Touch Display Panel Misaligned Wiring Reduces Parasitic Capacitance
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Solution Overview
Problem
Existing touch display panels face issues due to excessive parasitic capacitance, which affects touch experience and performance by increasing the driving load of the touch chip.
Innovation Solution
The proposed touch display panel incorporates a touch electrode wiring layer with touch electrode repetition units, where connection wires are distributed in a misaligned manner to reduce parasitic capacitance. The signal transmission wiring layer is designed such that the orthographic projection of signal transmission wires on the touch electrode wiring layer overlaps with connection wires, optimizing the overlap area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal transmission wires are placed under touch electrodes to transmit touch signals, then touch signal transmission is achieved, but parasitic capacitance between signal transmission wires and touch electrodes increases excessively
Solution Approach 1:
The patent extracts the signal transmission function from the traditional wire-under-electrode configuration and relocates it to a separate signal transmission wiring layer. This separation removes the source of parasitic capacitance generation while preserving the essential touch signal transmission capability, directly resolving the contradiction between reliable signal transmission and excessive parasitic capacitance
Solution Approach 2:
The patent introduces an intermediary structure - the signal transmission wiring layer with misaligned connection wires - that mediates between the touch electrode wiring layer and the touch chip. This intermediary layer transmits touch signals while its misaligned wire configuration minimizes overlap area with touch electrodes, thereby reducing parasitic capacitance formation
2Ease of manufacture
If connection wires are arranged in a regular aligned manner, then manufacturing is simplified, but visible light spots appear affecting display quality
Solution Approach 1:
The patent applies asymmetry by deliberately misaligning the connection wires in the signal transmission wiring layer relative to the touch electrodes in the touch electrode wiring layer. This asymmetric, non-uniform arrangement prevents regular light reflection patterns that cause visible light spots, while the misaligned configuration also reduces overlap area to minimize parasitic capacitance, maintaining ease of manufacture through systematic misalignment rather than complex random positioning
Data Source
AI summary
Embodiments of the present disclosure disclose a touch display panel, which includes a plurality of touch sub-units and a plurality of connection wires, wherein the plurality of touch sub-units include the touch sub-units extending in a first direction and a second direction, and two adjacent columns of the touch sub-units extending in the second direction are electrically connected via connection wires; in one of touch electrode repetition units, the connection wires distributed in the first direction are disposed in a misaligned manner in the second direction.