Scan Driving Circuit Simplification for High Temperature Reliability
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Solution Overview
Problem
Conventional scan driving circuits face reliability issues and have complex structures, particularly when operating under high temperatures, leading to time delays and current leakage.
Innovation Solution
A simplified scan driving circuit design incorporating a pull-down controlling module, pull-down module, reset-controlling module, resetting module, downward-transferring module, first and second bootstrap capacitors, constant low and high voltage sources, and specific transistor configurations to generate and manage scan signals and clock signals, ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional scan driving circuit is used, then the circuit can drive scan lines, but the structure becomes complex and reliability decreases under high temperatures
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional scan driving circuit. Specifically, it removes the bootstrap capacitor and part of the reset controlling module, retaining only the essential pull-down controlling module, pull-down module, resetting module, and downward-transferring module. This extraction reduces structural complexity while maintaining functional integrity and improving reliability under high temperature conditions.
Solution Approach 2:
The patent makes the remaining modules perform multiple functions. For example, the pull-down controlling module not only controls the pull-down operation but also generates scan voltage signals. The resetting module integrates both reset functionality and pull-up operations. This multi-functionality reduces the overall number of components needed, simplifying the structure while maintaining all necessary functions for reliable operation.
2Productivity
If the scan driving circuit operates under high temperatures, then driving function is maintained, but time delays and current leakage occur
Solution Approach 1:
The patent optimizes the electrical parameters of the remaining modules to perform better under high temperature conditions. By simplifying the circuit structure, it reduces parasitic effects and leakage currents that typically worsen with temperature. The optimized module configuration ensures that time delays are minimized while maintaining driving function across a range of temperatures.
Data Source
AI summary
A scan driving circuit is provided for driving scan line in cascade, including a pull-down controlling module, a pull-down module, a reset-controlling module, a resetting module, a downward-transferring module, a first bootstrap capacitor, a constant low voltage level source, and a constant high voltage level source. By disposing the resetting module, the scan driving circuit of the present invention raises the reliability of the scan driving circuit and simplifies the entire structure of the scan driving circuit.