Shift Register Switch Circuit for Node Potential Stability
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Solution Overview
Problem
The stability of electric potentials in shift register units is poor due to the simultaneous effective electric potentials of clock and input signals affecting both the input and resetting control circuits, leading to instability in node electric potentials.
Innovation Solution
A shift register unit with an additional switch circuit that disconnects the second and third nodes when the input signal is at a specific electric potential, preventing the second power source signal from being transmitted to the second node, and connects them when the clock signal is at that potential, ensuring stable electric potentials through controlled node connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resetting control circuit is controlled by the clock signal to enable simultaneous operation of input and resetting circuits, then the circuit can operate in both input and resetting states, but the stability of electric potentials at the first and second nodes deteriorates
Solution Approach 1:
The patent segments the control signals for the input circuit and resetting control circuit using different clock phases (first clock signal and second clock signal). This segmentation allows both circuits to operate simultaneously without interference, as they are activated at different times within the same clock cycle, thereby resolving the contradiction between operational capability and electric potential stability
Solution Approach 2:
The patent implements dynamic control of circuit states through phased clock signals. The input circuit and resetting control circuit are dynamically activated and deactivated in sequence within each clock cycle, allowing the system to maintain both operational flexibility and signal stability by transitioning between states in a controlled manner
Data Source
AI summary
The present disclosure relates to a shift register unit and driving method thereof, a gate electrode driving circuit and a display apparatus, in the field of display technology. The shift register unit comprises an input circuit, an output circuit, a control circuit, a reset circuit, and a switch circuit. The switch circuit may control the second and third nodes to be disconnected when the electric potential of the input signal is the first electric potential (i.e., the effective electric potential). Thus, the following case can be avoided: when the second clock signal and the input signal have the first electric potential respectively, the second power source signal written into the third node by the second power source signal end is transmitted to the second node. As a result, the stability of the electric potential of the second node can be ensured. Further, as the reset circuit resets the first node and the output end under the control of the second node, after the electric potential of the second node stabilizes, the stability of the electric potential of the first node and the output end can be ensured.