GOA Driving Circuit Segmentation for Threshold Voltage Stability
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Solution Overview
Problem
The existing GOA driving circuit technology for liquid crystal displays experiences instability due to positive bias stress, which affects the threshold voltage of switching transistors and subsequently the display stability, despite the use of pull-down holding modules to mitigate circuit failures.
Innovation Solution
The proposed GOA driving circuit incorporates a cascaded structure with pull-up and pull-down modules, including pull-down holding units equipped with capacitors, to manage gate signal nodes and horizontal scanning lines, ensuring proper voltage control and reducing positive bias stress through the use of clock signals and voltage lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pull-down holding modules are used to prevent circuit failure from positive bias stress, then circuit reliability is improved, but threshold voltage positive shifting still occurs affecting display stability
Solution Approach 1:
The pull-down holding module is divided into two separate units: a first pull-down holding unit and a second pull-down holding unit. Each unit independently manages threshold voltage compensation for different scanning lines, preventing cumulative positive bias stress effects and maintaining display stability across the entire display panel.
Solution Approach 2:
The pull-down holding units operate periodically to refresh and maintain the threshold voltage compensation. By cycling through different scanning lines in sequence, the system prevents sustained positive bias stress on any single line while ensuring continuous display stability.
2Ease of manufacture
If GOA driving circuit is integrated on glass substrate, then manufacturing cost is reduced and production capacity is improved, but threshold voltage stability deteriorates due to positive bias stress
Solution Approach 1:
The integrated GOA driving circuit incorporates multiple pull-down holding units that segment the threshold voltage compensation function across different scanning line groups. This segmentation allows the low-cost integrated architecture to maintain threshold voltage stability by preventing cumulative bias stress effects.
Solution Approach 2:
The pull-down holding units dynamically adjust voltage parameters to compensate for threshold voltage shifts caused by positive bias stress. By changing voltage levels periodically, the system maintains stable transistor operation despite the integrated circuit's susceptibility to bias stress.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the stability of the liquid crystal display by effectively managing voltage biases across switching transistors, preventing invalid states and improving overall display stability.
Implementation Method 1
a bootstrap capacitor module; the pull-up module, the pull-down module, the pull-down holding module, and the bootstrap capacitor module couple to an N-th gate signal node Qn
Data Source
AI summary
The present disclosure provides a GOA driving circuit and a liquid display panel. The GOA driving circuit comprises a plurality of cascaded GOA units. An N-th GOA unit comprises a pull-up module, a pull-down module, a pull-up control module, a pull-down holding module, and a bootstrap capacitor module. The pull-up module, the pull-down module, the pull-down holding module, and the bootstrap capacitor module couple to an N-th gate signal node Qn.