Shift Register Unit with Alternating TFT Recovery for Stable Output
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Solution Overview
Problem
Gate drive circuits in display devices face issues with reduced service life and output stability due to thin film transistors being under a large bias voltage for extended periods, affecting the shift register units.
Innovation Solution
The shift register unit design includes an input circuit, node control circuit, first and second control output circuits, and an output circuit, with transistors operating alternately to allow for characteristic recovery, enhancing service life and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistors operate continuously under large bias voltage, then the gate drive circuit can maintain continuous signal output, but the service life and output stability are reduced
Solution Approach 1:
The patent implements periodic action by dividing the operation into alternating first and second phases. During the first phase, the first transistor operates to output signals while the second transistor is in recovery mode. During the second phase, the second transistor operates while the first transistor recovers. This periodic switching allows continuous signal output while providing regular recovery periods for each transistor, thereby maintaining both productivity and reliability.
2Duration of action of moving object
If transistors are subjected to large bias voltage for extended periods, then the gate drive circuit can maintain operational functionality, but the characteristic recovery time is insufficient leading to performance degradation
Solution Approach 1:
The patent applies periodic action by creating alternating operational phases where each transistor gets dedicated recovery time. The first transistor operates during the first phase and recovers during the second phase, while the second transistor operates during the second phase and recovers during the first phase. This ensures that no transistor is subjected to continuous stress without recovery, maintaining reliability over extended operational periods.
Solution Approach 2:
The patent implements the discarding and recovering principle by intentionally switching off one transistor while the other is active, allowing the switched-off transistor to recover its characteristics. The control circuit discards the contribution of one transistor during each phase to enable the other to operate, and then alternates this arrangement to provide recovery time for both transistors, ensuring maintained performance over time.
Data Source
AI summary
Disclosed are a shift register unit, a gate drive circuit, a display device, and a driving method thereof. The shift register unit includes an input circuit, a node control circuit, a first control output circuit, a second control output circuit and an output circuit. The output circuit includes an eleventh transistor, a twelfth transistor, and a thirteenth transistor; a first electrode of the eleventh transistor is coupled to the input circuit, and a second electrode of the eleventh transistor is coupled to a gate electrode of the thirteenth transistor; a first electrode of the twelfth transistor is coupled to the first electrode of the eleventh transistor; the eleventh transistor and the twelfth transistor are configured to provide a signal the gate electrode of the thirteenth transistor.