Touch Screen Sub-Electrode Segmentation for Interference
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Solution Overview
Problem
Current touch screens face challenges in accurately detecting touch position and pressure due to increased electromagnetic interference and varying touch sensing sensitivity, especially near the pad connection area, which affects the overall user input experience and power consumption.
Innovation Solution
The implementation of a touch screen design featuring a first electrode layer and a second electrode layer with alternating sensing electrode columns and lines, where sub-electrodes are electrically connected through sensing lines, and the application of touch driving and pressure driving signals to detect touch and pressure inputs, respectively, utilizing a polymer insulating layer for elasticity and reduced noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-electrodes of adjacent first sensing electrodes are electrically connected through sensing lines, then touch sensing sensitivity and accuracy are improved, but electromagnetic interference increases
Solution Approach 1:
The electrode structure is segmented into multiple sub-electrodes within each sensing electrode, with adjacent sub-electrodes electrically connected through sensing lines. This segmentation allows for improved touch sensing sensitivity while the structured connection method helps manage electromagnetic interference through controlled signal paths.
2Measurement precision
If pressure driving signals are applied continuously to detect touch pressure, then pressure detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system applies pressure driving signals periodically rather than continuously. The controller applies pressure driving signals to the second sensing electrodes at predetermined intervals to detect touch pressure, which reduces power consumption while maintaining adequate pressure detection accuracy through periodic sampling.
3Measurement precision
If more sensing electrode columns and lines are added to improve detection coverage, then touch detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces a vertical dimension by dividing sensing electrodes into multiple sub-electrodes arranged in the thickness direction, in addition to the planar arrangement. This dimensional change allows for improved detection coverage and accuracy without proportionally increasing the planar complexity of the electrode structure.
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 touch sensing sensitivity and accuracy while reducing electromagnetic interference and power consumption by optimizing the connection and signal application, allowing for precise detection of touch position and pressure without constant pressure signal application.
Implementation Method 1
The insulating layer may include a polymer material having elasticity
Data Source
AI summary
A touch screen includes a first electrode layer, an insulating layer on a first electrode layer, and a second electrode layer on the insulating layer. The first electrode layer or second electrode layer includes first sensing electrode columns and second sensing electrode columns. The first sensing columns include first sensing electrodes having sub-electrodes. The second sensing electrode columns are alternately arranged with the first sensing electrode columns and include second sensing electrode. The sub-electrodes of one of adjacent first sensing electrodes are electrically connected to sub-electrodes of another one of the adjacent first sensing electrodes, respectively.