Touch Panel Electrode Segmentation for Noise Reduction
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Solution Overview
Problem
The increasing proximity between touch panels and display panels in touch display devices leads to increased coupling capacitance, causing noise interference from the display panel that affects the touch panel's sensitivity and functionality.
Innovation Solution
The touch panel incorporates touch electrodes with both a touch sensing region and a capacitance adjustment region. The capacitance adjustment region reduces the capacitance-to-ground and coupling capacitance between adjacent electrodes, minimizing noise interference from the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between touch panel and display panel is reduced to achieve thinner device profile, then the device thickness is improved, but the coupling capacitance increases causing noise interference
Solution Approach 1:
The touch electrode is segmented into two distinct regions: a touch sensing region for receiving touch signals and a capacitance adjustment region for controlling electrical parameters. This segmentation allows the electrode to simultaneously maintain touch sensitivity while reducing coupling capacitance to the display panel, thereby resolving the noise interference issue that arises when device thickness is reduced.
Solution Approach 2:
Different regions of the touch electrode are assigned different electrical characteristics. The touch sensing region maintains high sensitivity for touch detection, while the capacitance adjustment region is specifically designed with modified capacitance properties to reduce coupling with the display panel. This local differentiation enables the electrode to fulfill multiple functional requirements within the same structure.
2Measurement precision
If the area of touch electrode is increased to improve touch sensitivity, then the touch sensitivity is improved, but the capacitance-to-ground increases causing more noise
Solution Approach 1:
The touch electrode is divided into a touch sensing region that can be optimized for sensitivity and a capacitance adjustment region that controls the overall capacitance. This allows the sensing region to maintain larger area for better touch detection while the adjustment region limits the total capacitance-to-ground, preventing excessive noise generation.
Solution Approach 2:
The capacitance characteristics of the touch electrode are modified by changing the parameters of the capacitance adjustment region, such as its area, position, or electrical properties. This enables independent optimization of touch sensitivity and capacitance-to-ground ratio, allowing large sensing areas without proportional increases in noise-generating capacitance.
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
This design enhances the touch sensitivity of the touch panel by reducing noise interference, thereby improving the signal-to-noise ratio and resolving issues of insensitivity or failure in touch control.
Implementation Method 1
The capacitance adjustment region is configured to reduce at least one of capacitance-to-ground of the touch electrode or coupling capacitance between two adjacent touch electrodes
Data Source
AI summary
A touch panel and a touch display device. The touch panel includes a plurality of touch electrodes disposed in the same layer. A touch electrode includes a touch sensing region and a capacitance adjustment region. The touch sensing region is configured to transmit a touch signal. The capacitance adjustment region is configured to reduce at least one of capacitance-to-ground of the touch electrode or coupling capacitance between two adjacent touch electrodes.