GOA Circuit Signal Interrupt and Touch Scan Delay Reduction
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Solution Overview
Problem
The existing GOA circuit faces competition risks due to constant low voltage level signals, which interfere with touch scan signals and cause delays in touch scan operations.
Innovation Solution
A GOA circuit design featuring cascade-coupled stages with specific thin film transistor configurations, including forward-backward scan control modules, node control modules, output modules, and voltage stabilizing modules, that allow for signal interrupt functionality without voltage level interference, using a composite signal and clock signals to manage scan operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GOA circuit uses constant low voltage level signal to pull down the output end voltage level, then the signal interrupt function is achieved, but the touch scan signal is interfered with and delayed
Solution Approach 1:
The patent introduces a control signal as an intermediary to manage the interaction between the GOA circuit output and the touch scan signal. The control signal selectively enables or disables the pull-down function based on the operational mode (display vs. touch scan), preventing direct interference while maintaining the signal interrupt capability when needed.
Solution Approach 2:
The patent makes the output end voltage level dynamic rather than constant. The pull-down function is activated only when required for display operation, and disabled during touch scan operations. This dynamic control eliminates the constant interference caused by the fixed low voltage level while preserving the ability to interrupt signals when necessary.
2Productivity
If the GOA circuit outputs constant low voltage level signal to control the output end, then the gate scan driving is achieved, but competition risk occurs with touch scan signals
Solution Approach 1:
The patent transforms the static constant low voltage level control into a dynamic controlled signal. The output end voltage level changes based on the operational mode: it pulls down during display operations to enable gate scanning, but maintains normal levels during touch scan operations to avoid signal competition. This dynamic behavior resolves the conflict between the two functions.
Solution Approach 2:
The patent applies different voltage level characteristics to different operational contexts. Instead of a uniform constant low voltage level, the control signal adapts its characteristics locally based on whether the system is in display mode or touch scan mode, allowing each operation to have the optimal voltage level for its specific requirements.
Data Source
AI summary
Disclosed is a GOA circuit. By locating the thirteenth thin film transistor (T13) coupled with the tenth thin film transistor (T10) in series and controlled by the Mth clock signal (CK(M)) in the output module (400) of the nth stage GOA unit, as entering signal interrupt and performing touch scan, the output competition of the output ends (G(n)) can be prevented; by locating the twelfth thin film transistor (T12) controlled by the global control signal (Gas) in the output end pull-down module (600), and by setting the composite signal (CS) to be the pulse signal consistent with the touch scan signal as entering signal interrupt and performing touch scan, the twelfth thin film transistors (T12) of the GOA units of all stages can be activated, and the output ends of the GOA units of all stages outputs the composite signal (CS) consistent with the touch scan signal (TP).