Capacitive Touch Panel Electrode Segmentation for Signal Distortion
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Solution Overview
Problem
Conventional touch screen panels experience sensing distortion and errors during multi-touch operations due to excessive backwash signals from surrounding driving electrodes, leading to inaccurate touch position determination.
Innovation Solution
A capacitive touch panel design featuring a substrate with a touch sensing layer and an electrode module comprising parallel first and second electrodes, where the first electrodes are connected by signal lines in the X-axis direction and second electrodes by signal lines in the Y-axis direction, allowing for accurate detection of touch signals and minimizing backwash signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch screen panels use parallel driving electrodes for multi-touch detection, then the touch sensing capability is improved, but excessive backwash signals from surrounding electrodes cause sensing distortion and position determination errors
Solution Approach 1:
The driving electrodes are segmented into multiple independent groups (first driving electrode group and second driving electrode group) that can be independently controlled. This segmentation allows selective activation of specific electrode groups to minimize backwash signals while maintaining multi-touch detection capability, thereby resolving the contradiction between sensing accuracy and signal interference.
Solution Approach 2:
Different regions of the electrode structure are assigned different functions and properties. The first and second driving electrode groups have different orientations and activation patterns, allowing local optimization of signal detection while minimizing interference from surrounding electrodes. This local differentiation enables accurate touch position determination without excessive backwash signals.
2Area of stationary object
If the touch sensing layer uses a conventional electrode arrangement, then the manufacturing process is simple, but the touch area range is limited and multi-touch detection accuracy deteriorates
Solution Approach 1:
The electrode arrangement transitions from a single-dimensional parallel configuration to a two-dimensional orthogonal configuration with first driving electrodes extending in one direction and second driving electrodes extending perpendicular to them. This dimensional expansion maximizes the touch area range while maintaining reliable multi-touch detection through independent electrode group control.
Solution Approach 2:
The touch sensing layer employs a composite electrode structure combining first driving electrodes and second driving electrodes with different orientations and functions. This composite arrangement integrates the advantages of both electrode types, enabling comprehensive touch area coverage and reliable multi-touch detection while maintaining manufacturing feasibility.
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 maximizes the touch area range of first electrode elements, enabling accurate detection of touch positions and preventing signal distortion, thus ensuring precise touch input even with multiple fingers, enhancing the reliability of touch screen operations.
Implementation Method 1
When a finger, stylus or any other conductive object touches or approaches the touch screen, the internal capacitive value of the touch screen is changed. This change in capacitive value is then detected by the internal controller for determination of the location of the touch on the touch screen
Data Source
AI summary
A capacitive touch panel includes a substrate having a touch sensing layer on the surface thereof, and an electrode module mounted in the touch sensing layer and including first electrodes arranged in parallel in X-axis direction and second electrodes arranged in parallel in Y-axis direction. Each first electrode includes multiple first electrode elements and multiple first signal lines arranged in X-axis direction and respectively electrically connected between each two adjacent first electrode elements. Each second electrode includes multiple second electrode elements respectively disposed adjacent to and spaced from the first electrode elements of one respective first electrode and multiple second signal lines arranged in Y-axis direction and respectively electrically connected between each two adjacent second electrode elements. Thus, the electrode module accurately senses the touch signal of the touch sensing layer without distortion.