Gate Driver Circuit Switching to Limit Pull-Down Transistor Stress
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Solution Overview
Problem
Transistors formed using non-single-crystal semiconductors, particularly pull-down transistors in gate drivers, deteriorate due to prolonged conduction periods, leading to mobility decrease and threshold voltage fluctuations.
Innovation Solution
A semiconductor device design incorporating multiple transistors and switches with controlled conduction periods, utilizing various switch types and transistor configurations to minimize on-time and reduce deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pull-down transistor is kept on to apply negative voltage to the gate signal line, then the gate driver can output signals in both positive and negative directions, but the transistor deteriorates due to prolonged conduction
Solution Approach 1:
The patent applies periodic action by controlling the pull-down transistor to conduct only during specific periods when negative voltage output is required, rather than keeping it continuously on. This periodic conduction reduces deterioration while maintaining the ability to output negative voltage signals when needed
Solution Approach 2:
The patent implements dynamics by making the conduction state of the pull-down transistor variable and controllable based on operational requirements. The transistor switches between on and off states dynamically, allowing the system to adapt between maintaining versatility and preserving reliability based on signal output needs
2Ease of manufacture
If transistors are used to form driver circuits on the same substrate as pixel portions, then manufacturing cost is reduced and integration is improved, but transistor deterioration occurs due to prolonged operation
Solution Approach 1:
The patent reduces transistor deterioration in integrated driver circuits by implementing periodic control of transistor conduction. Transistors are switched on only during necessary periods for signal output rather than continuous operation, extending their operational lifespan while maintaining the cost-effective integrated structure
Solution Approach 2:
The patent applies parameter changes by controlling the temporal parameters of transistor operation (conduction duration and timing). By adjusting when and how long transistors conduct, the system maintains the benefits of integration while reducing cumulative stress and deterioration from prolonged operation
Data Source
AI summary
A semiconductor device including a circuit which does not easily deteriorate is provided. The semiconductor device includes a first transistor, a second transistor, a first switch, a second switch, and a third switch. A first terminal of the first transistor is connected to a first wiring. A second terminal of the first transistor is connected to a second wiring. A gate and a first terminal of the second transistor are connected to the first wiring. A second terminal of the second transistor is connected to a gate of the first transistor. The first switch is connected between the second wiring and a third wiring. The second switch is connected between the second wiring and the third wiring. The third switch is connected between the gate of the first transistor and the third wiring.