Touch Screen Panel Electrode Segmentation for Sensing Accuracy
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Solution Overview
Problem
Conventional touch screen panels face challenges in enhancing sensing accuracy and reducing response time and current consumption, particularly due to limitations in the design of sensing and driving electrodes.
Innovation Solution
The touch screen panel incorporates an electrode pattern layer with separate sensing and driving electrodes, featuring main electrodes with expanded parts that include sub-electrodes and expanded electrodes arranged in a symmetrical pattern, surrounded by driving electrodes, to improve capacitance sensing accuracy and reduce non-uniformity in capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensing electrodes and driving electrodes are used in a touch screen panel, then the basic touch detection function is achieved, but sensing accuracy is insufficient and response time is prolonged
Solution Approach 1:
The sensing electrode is divided into a main electrode and multiple expanded parts, each consisting of sub-electrodes and expanded electrodes. This segmentation creates a more distributed electrode structure that improves capacitance sensing accuracy by reducing non-uniformity in capacitance changes across different touch positions.
Solution Approach 2:
The expanded parts extend the sensing electrode structure into additional spatial dimensions, creating a multi-dimensional electrode pattern. This dimensional expansion allows for more comprehensive capacitance detection and improves sensing accuracy by capturing capacitance changes from multiple directional perspectives.
2Measurement precision
If conventional electrode designs are used, then the touch screen panel structure is simple, but current consumption is high and sensing accuracy is limited
Solution Approach 1:
The expanded parts are strategically positioned at specific locations where capacitance non-uniformity occurs, applying enhanced sensing capability locally rather than uniformly across the entire electrode. This localized enhancement improves sensing accuracy in critical areas while minimizing additional current consumption.
Solution Approach 2:
The electrode structure parameters are optimized by controlling the shape, size, and distribution of the expanded parts. By adjusting these geometric parameters, the patent achieves improved sensing accuracy while managing current consumption through optimized electrode geometry rather than increased electrode area.
3Measurement precision
If the electrode structure is expanded to improve sensing accuracy, then capacitance sensing precision is enhanced, but the device complexity increases
Solution Approach 1:
The sub-electrodes and expanded electrodes are merged into a single integrated expanded part structure that is formed as one continuous pattern with the main electrode. This merging approach improves capacitance sensing accuracy through enhanced electrode geometry while avoiding the complexity of multiple separate electrode components.
Solution Approach 2:
The expanded parts exhibit asymmetric configurations relative to the main electrode, with sub-electrodes and expanded electrodes positioned at specific asymmetric locations. This asymmetric design optimizes capacitance detection by targeting specific non-uniformity patterns while maintaining manageable structural complexity through deliberate asymmetric positioning rather than symmetric multiplication.
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 sensing accuracy and reduces response time and current consumption by ensuring gentler capacitance changes and more symmetrical electrode structures, leading to improved touch detection performance.
Implementation Method 1
capacitive change between a sensing electrode and a driving electrode is detected by touch to determine a touch point
Data Source
AI summary
Disclosed is a touch screen panel including a plurality of separate sensing electrodes, and a plurality of separate driving electrodes. Each of the sensing electrodes includes a main electrode and a plurality of expanded parts. Each of the expanded parts includes a sub-electrode extending from the main electrode and at least one expanded electrode extending from the sub-electrode. Each of the driving electrodes surrounds at least part of a corresponding one of the expanded parts.