Touch Panel Guard Line for Signal-to-Noise Ratio
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Solution Overview
Problem
Existing capacitive touch panels have low signal-to-noise ratios due to interference between the touch signal lines and the touch electrodes.
Innovation Solution
A touch panel design that includes a guard line between the touch signal line and the touch area, increasing the distance between the signal line and the touch electrodes and shielding interference to improve the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch signal line is placed close to the touch electrode for compact design, then the device structure is simplified, but the signal-to-noise ratio deteriorates due to interference
Solution Approach 1:
A guard line is introduced as an intermediary element between the touch signal line and the touch electrode. This guard line acts as a mediator that blocks electromagnetic interference from the touch electrode from reaching the touch signal line, thereby improving the signal-to-noise ratio while allowing the signal line to remain in a practical position for compact design
2Measurement precision
If the distance between the touch signal line and touch electrode is increased to reduce interference, then the signal-to-noise ratio is improved, but the device area increases
Solution Approach 1:
The guard line serves as a compact intermediary structure that provides effective interference shielding without requiring large separation distances. By placing the guard line adjacent to the touch signal line, the patent achieves noise reduction while maintaining a compact overall device area
3Measurement precision
If a guard line is added to shield interference, then the signal-to-noise ratio is improved, but the device complexity increases
Solution Approach 1:
The guard line is designed with the same structural characteristics as the touch signal line, using identical line width, material layer, and routing style. This homogeneous design allows the guard line to be seamlessly integrated into the existing PCB layout without requiring additional complex manufacturing processes or distinct structural elements
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 introduction of the guard line reduces interference between the touch signal line and the touch electrodes, leading to an improved signal-to-noise ratio in the touch panel.
Implementation Method 1
the guard line is provided between the first touch signal line and the touch area... the provided guard line can also shield the interference between the first touch signal line and the second touch electrode
Data Source
AI summary
Disclosed are a touch panel and a display apparatus. The touch panel includes a touch area (100) and a peripheral area (200) surrounding the touch area (100), and includes: a base substrate (1); a first touch electrode (2) and a second touch electrode (3) arranged to intersect with each other, provided on the base substrate (1) and located in the touch area (100); a first touch signal line (4), provided on the base substrate (1) and located in the peripheral area (200), and electrically connected with the first touch electrode (2); and a guard line (7) provided on the base substrate (1), located between the first touch signal line (4) and the touch area (100), and separated from the first touch signal line (4) and from the touch area (100), where the guard line (7) is in a floating state. A signal-to-noise ratio can be improved.