Touch Panel Transmission Paths for Signal Impedance Uniformity
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Solution Overview
Problem
Conventional touch panels suffer from sensitivity issues due to unequal impedance values in cabling between sensing electrodes and touch panel ICs, leading to false signal recognition and reduced sensitivity.
Innovation Solution
A touch panel display device with identical electrical impedance transmission paths, where each transmission path connects a touch detecting electrode to a touch detecting circuit, ensuring that the difference in touch signal variations is minimized, thereby reducing the likelihood of false identification and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If leads of different lengths are used to connect touch detecting electrodes to TP IC, then the layout flexibility is improved, but the impedance uniformity deteriorates causing false signal recognition
Solution Approach 1:
The patent changes the physical parameter of lead length to be uniform across all connections between touch detecting electrodes and TP ICs. This parameter change ensures that electrical impedance values remain consistent, preventing false signal recognition while maintaining layout flexibility through standardized connection design.
Solution Approach 2:
The patent creates equipotential conditions by ensuring all leads have identical length and impedance characteristics. This eliminates potential differences and impedance variations that would otherwise cause signal distortion and false recognition, ensuring uniform signal transmission across all touch detecting electrodes.
2Ease of operation
If leads of different lengths are used, then routing flexibility is improved, but the electrical impedance uniformity deteriorates affecting touch sensitivity
Solution Approach 1:
The patent standardizes the lead length parameter to be identical for all connections, ensuring uniform electrical impedance. This maintains reliable touch sensitivity by preventing impedance-related signal variations while still allowing routing flexibility within the constraints of uniform length design.
Solution Approach 2:
The patent applies homogeneity by making all leads identical in length and impedance characteristics. This ensures that all touch detecting electrodes experience the same electrical conditions, maintaining uniform touch sensitivity and reliability across the entire touch panel surface.
3Device complexity
If unequal impedance paths are used, then design simplicity is improved, but signal transmission accuracy deteriorates due to varying signal levels
Solution Approach 1:
The patent changes the impedance parameter to be uniform across all transmission paths by equalizing lead lengths. This simple design approach maintains signal transmission accuracy by ensuring that all sensing signals experience identical electrical conditions, preventing false recognition while keeping the cabling design straightforward.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures that touch signals are transmitted with consistent variations, reducing the probability of false identification and improving the sensitivity of the touch panel by maintaining a uniform transmitting environment for all signals.
Implementation Method 1
An electrical impedance of the plurality of transmission paths is identical so that a difference of variation for each touch signal of the plurality of touch detecting electrodes is smaller than a first predetermined value after being transmitted through each of the plurality of transmission paths
Data Source
AI summary
The present invention proposes a touch panel display device and an array substrate. A touch panel display device includes a touch detecting circuit, touch detecting electrodes, and transmission paths. One terminal of each of the transmission paths is connected to one of the touch detecting electrodes, and the other terminal of each of the transmission paths is connected to the touch detecting circuit, for transmitting a touch signal of the touch detecting electrode to the touch detecting circuit. A difference of variation for each touch signal of the touch detecting electrodes is smaller than a first predetermined value after being transmitted through each of the transmission paths. The first predetermined value is a threshold by which false identification occurs among the touch signals from the touch detecting electrodes. The present invention improves sensitivity of touch.