Capacitive Touch Panel Partitioned Regions Signal Interference
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Solution Overview
Problem
Large-sized capacitive touch screens with high precision requirements face challenges due to longer drive/sense lines, which increase resistance and interfere with signal detection, affecting touch control precision.
Innovation Solution
The capacitive touch panel is designed with partitioned regions on its surfaces, shortening the length of drive/sense lines and reducing resistance by dividing the surfaces into multiple regions for drive/sense lines, and incorporating ground wires to minimize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size is increased, then the display area is improved, but the length of drive/sense lines increases causing higher resistance and signal interference
Solution Approach 1:
The touch panel surface is divided into multiple regions (first region, second region, third region, fourth region) with drive lines and sense lines confined to specific regions. This segmentation shortens the length of drive and sense lines, reducing resistance and signal interference, thereby maintaining reliable signal detection even in large-sized screens.
2Measurement precision
If the touch control precision is increased, then the measurement accuracy is improved, but the drive/sense lines become finer increasing resistance
Solution Approach 1:
By dividing the screen into multiple regions and confining drive/sense lines to specific regions, the line lengths are reduced. This allows the use of finer lines for high precision touch control without excessive resistance, as the shorter path compensates for the reduced cross-sectional area.
Solution Approach 2:
Different regions of the touch panel are assigned different functions (drive lines in first and third regions, sense lines in second and fourth regions). This local differentiation optimizes the electrical characteristics in each region, allowing fine lines for precision while managing resistance through regional confinement.
3Area of stationary object
If the drive/sense lines are made longer to cover larger area, then the coverage is improved, but the resistance increases affecting signal detection
Solution Approach 1:
The touch panel is segmented into multiple regions with drive lines confined to horizontal regions and sense lines to vertical regions. This segmentation enables coverage of the entire large screen area while keeping individual line lengths short, as lines only extend across their designated regions rather than spanning the full screen dimensions.
Data Source
AI summary
The present disclosure discloses a capacitive touch panel, including a substrate, wherein a first surface of the substrate includes a first region and a second region, and a second surface of the substrate includes a third region and a fourth region. A first group of drive lines is formed in the first region, a first group of sense lines is formed in the second region, a second group of the drive lines is formed in the third region, and a second group of the sense lines is formed in the fourth region. Each of the drive lines of the first group and the second group extends along a first direction from a periphery of the substrate to a middle of the substrate, with an end of said each drive line on the periphery of the substrate being connected to a drive chip.