Shift Register Node Potential Stabilization for GOA Noise Reduction
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Solution Overview
Problem
Existing Gate Driver on Array (GOA) circuits experience noise in scanning signals due to unstable potential at switch transistors, affecting the stability of shift registers and overall output.
Innovation Solution
A shift register design with input, reset, control, and output modules, along with noise reduction mechanisms, stabilizes node potentials using clock and direct current signals, ensuring stable scanning signal outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shift registers are controlled by clock signals in GOA circuits, then the scanning signal can be generated, but the node potential becomes unstable due to current leakage from surrounding switch transistors, causing noise in the output signal
Solution Approach 1:
The patent introduces a first potential stabilizing circuit and a second potential stabilizing circuit as intermediary components. These circuits act as mediators between the clock signal and the switch transistor gates, providing stable reference potentials that prevent direct influence from surrounding switch transistor leakage currents. The first potential stabilizing circuit connects to the first clock signal end while the second connects to the second clock signal end, creating isolated potential references that eliminate noise propagation.
Solution Approach 2:
The patent implements feedback mechanisms through the potential stabilizing circuits that continuously monitor and adjust node potentials. The first potential stabilizing circuit receives feedback from the first node and the second potential stabilizing circuit from the second node, allowing dynamic compensation for potential fluctuations caused by switch transistor leakage. This feedback loop ensures the gate potentials remain stable despite changing operating conditions.
2Productivity
If multiple cascaded shift registers are used to drive gate lines, then the display panel can be scanned, but the complexity of the circuit increases and noise accumulation occurs across multiple stages
Solution Approach 1:
The patent segments the GOA circuit into multiple independent shift register stages, each with its own potential stabilizing circuits. This segmentation allows each stage to operate independently with controlled noise, preventing noise accumulation across the cascade. The first shift register drives the first gate line while the second shift register drives the second gate line, creating modular functionality that maintains scanning capability while limiting complexity propagation.
Solution Approach 2:
The potential stabilizing circuits serve as intermediary elements between cascaded shift register stages, isolating noise from one stage from affecting subsequent stages. The first potential stabilizing circuit and second potential stabilizing circuit create electrical barriers that prevent noise propagation through the cascade, allowing multiple stages to function together without cumulative noise degradation.
3Device complexity
If the gate of the output switch transistor is left floating, then the circuit structure is simple, but the potential is influenced by current leakage from surrounding switch transistors, resulting in unstable output
Solution Approach 1:
The patent introduces potential stabilizing circuits as intermediary components that provide controlled potential references to the gate of the output switch transistor. The first potential stabilizing circuit connects to the first clock signal end while the second connects to the second clock signal end, creating stable reference potentials that replace the floating gate condition. This intermediary structure maintains circuit simplicity while eliminating the instability caused by direct floating gate connections.
Solution Approach 2:
The patent changes the potential parameter of the gate node from floating (undefined) to stable (controlled). By introducing the potential stabilizing circuits, the gate potential is transformed from a state influenced by leakage currents to a controlled state with stable voltage levels. This parameter change from floating to stabilized potential directly addresses the reliability issue while maintaining structural simplicity.
Data Source
AI summary
The present disclosure discloses a shift register and a method for driving the same, a gate driving circuit and a display apparatus. The shift register comprises an input module, a reset module, a first control module, a second control module, a first output module and a second output module. With cooperation among the above six modules, the shift register enables the potential at the third node for controlling the first output module to be in a stable state under the function of the first control module and enables the potential at the fourth node for controlling the second output module to be in a stable state under the function of the second control module. In this way, stability of the scanning signal output by the driving signal output end of the shift register is achieved, thereby reducing the noise in the scanning signal output by the driving signal output end, and improving the stability of the output of the shift register.