Touch Driving Circuit With Split-Area Sensing to Reduce Distortion
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Solution Overview
Problem
Signal distortion and reduced accuracy in touch sensing due to signal distortion in touch electrodes on display panels, particularly in non-reference touch areas, affect the performance of touch display devices.
Innovation Solution
The touch display device employs a substrate with distinct active and non-active areas, featuring reference and non-reference touch areas, and utilizes different driving and sensing schemes for touch electrode lines in these areas, along with a touch driving circuit that supplies touch signals during non-overlapping time periods to reduce signal distortion and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a uniform touch driving and sensing scheme is applied across the entire display panel, then the device complexity is reduced, but signal distortion occurs in non-reference touch areas and touch sensing accuracy deteriorates
Solution Approach 1:
The patent applies different driving and sensing schemes to different regions of the display panel. Specifically, the non-reference touch area uses a different driving scheme (different time period) and/or sensing scheme compared to the reference touch area. This local differentiation resolves the signal distortion problem in non-reference areas while maintaining uniformity in reference areas, thereby improving touch sensing accuracy without requiring complete system redesign.
Solution Approach 2:
The display panel is segmented into reference touch areas and non-reference touch areas, with each segment receiving customized driving and sensing schemes. The touch driving circuit divides the driving signal transmission into different time periods for different regions, and the sensing circuit processes signals from different regions using different schemes. This segmentation allows optimized performance for each region while managing overall system complexity.
2Measurement precision
If different driving and sensing schemes are applied to reference and non-reference touch areas, then signal distortion is reduced and touch sensing accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent changes the driving parameter (time period) and/or sensing parameter for different regions of the display panel. The non-reference touch area is driven during a different time period than the reference touch area, and sensing parameters are adjusted accordingly. This parameter differentiation reduces signal distortion and improves accuracy while maintaining a relatively simple overall architecture by only modifying operational parameters rather than hardware structure.
Data Source
AI summary
A touch display device is disclosed that divides an active area into a reference touch area and a non-reference touch area and independently drives touch electrode lines positioned in the reference touch area and touch electrode lines positioned in the non-reference touch area. Touch sensing performance is enhanced while preventing or reducing signal distortion due to a difference in unit touch sensors in the reference touch area and the non-reference touch area.