Touch Display Electrode Layout With RC Compensation Switching
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Solution Overview
Problem
Conventional in-cell self-capacitive-type touch panels experience uneven RC loading and resistance issues due to varying lengths of touch control signal lines, leading to flicker and afterimage problems, particularly in remote areas of the display panel.
Innovation Solution
A touch control display substrate design incorporating compensation switches and signal lines that intersect with the touch control electrode blocks, reducing the distance between signal lines and electrodes, thereby compensating for uneven signal line lengths and improving common voltage uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch control electrode blocks are individually connected to touch control signal lines, then each electrode block can be controlled independently, but signal line lengths vary causing uneven RC loading and resistance differences
Solution Approach 1:
The invention divides the common electrode layer into multiple electrode blocks that are time-division-multiplexed, allowing independent control of each block while maintaining uniform signal characteristics through shared signal line connections
Solution Approach 2:
The touch control electrode blocks serve dual functions: they act as common electrodes during display periods and as touch control electrodes during non-display periods, eliminating the need for separate touch control electrode structures
2Adaptability or versatility
If common electrode layer is divided into hundreds of blocks, then touch control function is improved, but RC loading increases causing flicker and afterimage problems
Solution Approach 1:
The invention uses time-division multiplexing to periodically switch between display mode and touch control mode, where during touch control periods only necessary electrode blocks are activated, reducing overall RC loading and preventing flicker and afterimage artifacts
Solution Approach 2:
The invention dynamically adjusts the voltage parameters applied to different electrode blocks based on their position and loading characteristics, compensating for RC loading effects and ensuring uniform signal transmission across the panel
Data Source
AI summary
A touch control display substrate, a touch control display panel, and a touch control display device are provided. The touch control display substrate includes a substrate, a plurality of touch control electrode blocks, a plurality of first touch control switches, a plurality of compensation switches, a plurality of first signal lines, and a plurality of compensation signal lines. Each of the compensation signal lines is connected to one of the compensation switches and one of the touch control electrode blocks. Each of the touch control signal blocks is connected to the first touch control switches by the first signal lines, and is connected to the compensation switches by the compensation signal lines.