Shift Register Discharge Circuit for Transistor Stress Reduction
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Solution Overview
Problem
In display technologies, the accumulation of charges in shift registers due to the Xao (Output All-on) function causes long-term stress on transistors, reducing their reliability, especially when the power supply is turned off and all gate lines are at a high level.
Innovation Solution
A shift register design incorporating inputting, outputting, resetting, and discharging sub-circuits with switching elements and storage capacitors, which allows for controlled signal transmission and discharging, ensuring efficient charge release and reducing transistor stress. The design includes cascaded shift registers in a gate driving circuit to manage the gate lines effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the Xao (Output All-on) function is implemented when power supply is turned off, then all gate lines are set to high level to discharge pixel electrodes, but charges accumulate in the shift register causing long-term stress on transistors and reducing reliability
Solution Approach 1:
The shift register is divided into multiple stages (first stage, second stage, etc.), with each stage having independent discharge controlling sub-circuits. This segmentation allows different stages to be discharged independently through different discharge controlling signals, preventing charge accumulation in any single stage while maintaining the Xao discharge function.
Solution Approach 2:
Discharge controlling sub-circuits are added to the shift register stages to proactively manage charge discharge. These sub-circuits receive discharge controlling signals that activate switching elements to discharge accumulated charges before they cause long-term stress on transistors, thus preventing reliability degradation while maintaining the discharge function.
2Reliability
If discharge controlling sub-circuits are added to each stage of the shift register, then charge accumulation is prevented and transistor reliability is improved, but the device complexity increases
Solution Approach 1:
The discharge controlling sub-circuits use the same basic structure (switching element connected to reference signal terminal and pulling-up node) across all stages of the shift register. This universal design allows the same circuit pattern to be replicated multiple times, reducing design complexity while achieving reliable charge discharge in each stage.
Solution Approach 2:
Each stage of the shift register is equipped with its own discharge controlling sub-circuit that can independently discharge charges in that stage. This self-service approach allows each stage to manage its own charge accumulation problem locally, eliminating the need for complex centralized charge management circuits.
Data Source
AI summary
Embodiments of the present disclosure provide a shift register, a gate driving circuit, a display panel and a display apparatus. The shift register comprises an inputting sub-circuit, an outputting sub-circuit, a resetting sub-circuit, and a first discharging controlling sub-circuit. The first discharging controlling sub-circuit is coupled to a first controlling signal inputting terminal, a second controlling signal inputting terminal and a signal outputting terminal, and configured to provide a second controlling signal from the second controlling signal inputting terminal to the signal outputting terminal under a control of a first controlling signal from the first controlling signal inputting terminal. The signal outputting terminal is set to a high level by inputting the first controlling signal and the second controlling signal to the shift register.