Touch Panel Driving Method Reducing Response Time via Segmented Scanning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch panel driving methods require scanning three frames to determine the touch position, leading to longer touch response times and preventing real-time display due to environmental noise interference.
Innovation Solution
A touch panel driving method that simultaneously inputs scanning signals to all touch electrodes in a row or column direction, determines suspected columns and rows, and then scans the suspected touch region row by row to accurately determine the touch position, significantly reducing the time required for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three frames are scanned to determine touch position to prevent false touch caused by environmental noise interference, then the reliability of touch detection is improved, but the touch response time increases
Solution Approach 1:
The touch detection process is divided into two stages: first, simultaneous scanning of all rows to identify suspected column quickly; second, sequential scanning only within the suspected region to confirm touch position. This segmentation reduces the detection scope in the second stage, thereby reducing overall response time while maintaining reliability through the two-stage verification process.
Solution Approach 2:
The patent performs preliminary simultaneous scanning of all rows to identify the suspected column before performing the detailed sequential scanning. This preliminary action narrows down the search area in advance, so that the time-consuming sequential scanning is only performed on a small suspected region rather than the entire touch panel, thus reducing overall detection time while maintaining reliability.
2Measurement precision
If three frames are scanned to determine touch position to prevent false touch, then the accuracy of touch position determination is improved, but the productivity of the touch panel system decreases
Solution Approach 1:
The detection process is segmented into a broad simultaneous scan phase followed by a focused sequential scan phase. The first phase quickly identifies the suspected column through simultaneous row scanning, and the second phase performs detailed scanning only within that suspected region. This segmentation maintains measurement precision by thoroughly scanning the relevant area while improving productivity by limiting the detailed scan to a small portion of the touch panel.
Solution Approach 2:
Instead of performing complete sequential scanning of all rows three times, the patent applies partial action by performing sequential scanning only within the suspected region identified by the initial simultaneous scan. This partial scanning approach maintains sufficient accuracy for touch position determination while significantly reducing the total number of scanning operations required, thus improving system productivity.
3Measurement precision
If sequential row-by-row scanning is performed to accurately determine touch position, then the measurement precision is improved, but the time required for detection increases
Solution Approach 1:
The patent performs a preliminary simultaneous scanning of all rows to identify the suspected column before performing the time-consuming sequential scanning. This preliminary action narrows down the search area in advance, so that sequential scanning is only performed on a small suspected region rather than the entire touch panel, thus reducing overall detection time while maintaining measurement precision.
Solution Approach 2:
The detection process is divided into two segments: a fast simultaneous scan of all rows to identify the suspected column, followed by a detailed sequential scan only within the suspected region. This segmentation allows the system to perform high-precision sequential scanning only where necessary, maintaining measurement precision while reducing the total time required by limiting the sequential scan scope.
Data Source
AI summary
The driving method includes: inputting a first scanning signal to each of the first touch electrodes at a same time, and receiving a first sensing signal of each of the second touch electrodes to determine a suspected column according to the first sensing signal; inputting a second scanning signal to each of the second touch electrodes at a same time, and receiving a second sensing signal of each of the first touch electrodes to determine a suspected row according to the second sensing signal; determining a suspected touch region according to the suspected column and the suspected row; and sequentially inputting a third scanning signal row by row to each of the first touch electrodes in the suspected touch region, and receiving a third sensing signal of each of the second touch electrodes in the suspected touch region to determine a touch position according to the third sensing signal.