Touch Control Display Panel Driving Circuit for Noise Reduction
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Solution Overview
Problem
In Single Layer On Cell (SLOC) touch control display panels, the large capacitance between touch control lines and gate lines leads to signal-to-noise ratio reduction due to capacitive coupling, causing Touch Noise issues.
Innovation Solution
A driving circuit with a timing controller, control unit, and touch control driving unit is used to generate touch control synchronization signals, ensuring that gate control signals are invalid during scanning, preventing simultaneous scanning of gate and touch control lines and thus reducing capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If touch control lines and gate lines are arranged in close proximity in SLOC structure, then the display panel becomes lighter and thinner, but capacitive coupling between the lines increases causing touch noise
Solution Approach 1:
The patent applies preliminary action by setting the gate control signal to an invalid state (ground potential) in advance during the touch control scanning period. This preliminary preparation prevents capacitive coupling noise from affecting the touch control lines when they are in close proximity, allowing the SLOC thin结构设计 to be maintained without suffering from touch noise issues.
2Productivity
If gate lines and touch control lines are scanned simultaneously, then the display refresh and touch control operations can proceed in parallel, but capacitive coupling causes signal noise
Solution Approach 1:
The patent implements periodic action by dividing the operating cycle into distinct periods: during the touch control scanning period, gate control signals are set to invalid state while touch control lines are scanned; during the display scanning period, touch control signals are suspended while gate lines are scanned. This periodic switching ensures that gate and touch control operations never occur simultaneously, eliminating capacitive coupling noise while maintaining high productivity through efficient time-division multiplexing.
3Measurement precision
If the report rate of touch control driving unit is increased to improve touch responsiveness, then touch control accuracy improves, but the complexity of synchronization control increases
Solution Approach 1:
The patent applies feedback by using the gate driving signal as a reference to generate touch control synchronization signals. The control unit receives the gate driving signal, extracts timing information, and generates corresponding touch control synchronization signals that automatically adapt to the display refresh rate. This feedback mechanism simplifies synchronization control while enabling high report rates for accurate touch control, as the system automatically adjusts to maintain proper timing relationships.
Data Source
AI summary
The present disclosure provides a touch control display panel, a driving method thereof and a touch control display device. The touch control display panel includes a plurality of gate lines on a base substrate, a plurality of touch control lines above the plurality of gate lines and opposite to the plurality of gate lines, and a driving circuit, wherein the plurality of gate lines and the plurality of touch control lines extend along a same direction, and the driving circuit includes a timing controller, a control unit and a touch control driving unit. The timing controller is configured to output a gate driving signal to the control unit. The control unit is configured to generate touch control synchronization signal(s) according to the gate driving signal and output the touch control synchronization signal(s) to the touch control driving unit.