Touch Display Panel Signal Line Impedance Matching
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Solution Overview
Problem
Current touch display panels suffer from poor uniformity in touch sensitivity due to varying impedance in touch sensing signal lines caused by different lengths and positions of touch sensing electrodes, leading to time delays in signal transmission.
Innovation Solution
The touch display panel design includes a fan-shaped wiring region with touch signal lines, where lines closer to the touch integrated circuit are single sub-signal lines and those farther away are multiple sub-signal lines, reducing impedance and improving signal transmission speed without altering the blind region size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch sensing electrodes are distributed at different positions in the panel, then the touch display panel can detect touches across the entire display area, but the length of touch sensing signal lines varies, resulting in different impedance and time delays that affect touch sensitivity uniformity
Solution Approach 1:
The patent applies local quality by differentiating the structure of touch signal lines based on their position and length. Shorter signal lines use a single conductor while longer signal lines use multiple conductors in parallel. This local differentiation compensates for impedance variations caused by different line lengths, ensuring uniform touch sensitivity across the entire display area without compromising the large touch detection area.
2Reliability
If touch sensing signal lines are made longer to reach remote touch sensing blocks, then all touch sensing blocks can be connected to the touch integrated circuit, but the impedance of the signal lines increases, causing time delays and affecting touch sensitivity uniformity
Solution Approach 1:
The patent changes the structural parameter of the signal lines by configuring longer signal lines with multiple conductors in parallel while keeping shorter signal lines as single conductors. This parameter change reduces the impedance of longer signal lines, thereby reducing time delays and maintaining uniform signal transmission speed across all touch sensing blocks, ensuring both comprehensive connection coverage and consistent signal transmission performance.
Data Source
AI summary
A touch display panel at least includes a plurality of touch signal lines, the touch signal lines includes a first type touch signal line and a second type touch signal line, and a distance between a first end of the first type touch signal line and a touch integrated circuit is less than a distance between a first end of the second type touch signal line and the touch integrated circuit. The first type touch signal line includes a single sub-signal line, and the second type touch signal line includes at least two sub-signal lines.