Shift Register Unit Node Potential Control
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Solution Overview
Problem
Existing liquid crystal display (LCD) shift register units experience potential suspension phenomena at key nodes due to residual potential from previous phases, leading to unstable output signals.
Innovation Solution
Incorporating a shift register unit design with pull-up and pull-down control modules, connected to specific clock and voltage signal terminals, which control potential nodes to prevent signal instability by ensuring proper signal output levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional 6T1C shift register unit structure is used, then the device complexity is reduced, but the output signal stability deteriorates due to potential suspension at key nodes
Solution Approach 1:
The patent applies preliminary action by introducing pull-up and pull-down control modules that proactively manage the potential levels at key nodes (nodes A, B, and C) before residual potential from previous phases can cause suspension. These control modules prepare the nodes in advance for the next operating phase, ensuring stable output signals by preventing potential floating conditions before they occur.
2Adaptability or versatility
If the shift register unit operates at different phases, then the functionality is improved, but potential suspension occurs at key nodes due to residual potential
Solution Approach 1:
The patent implements feedback mechanisms through pull-up and pull-down control modules that continuously monitor and adjust the potential levels at key nodes during phase transitions. The control modules receive feedback about the current state of nodes A, B, and C and actively adjust their control signals to maintain stable potential levels, preventing suspension effects that would otherwise occur during phase changes.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the potential levels at key nodes through controlled pull-up and pull-down operations. During different operating phases, the control modules modify the electrical parameters (potential levels) at nodes A, B, and C to ensure they remain in stable states, preventing residual potential from previous phases from causing suspension.
3Reliability
If key nodes are left without potential control, then the device complexity is minimized, but signal instability occurs at the output terminal
Solution Approach 1:
The patent introduces pull-up and pull-down control modules as intermediary elements between the clock signals and the key nodes (A, B, and C). These control modules act as mediators that manage the potential levels at the nodes, isolating the nodes from direct exposure to residual potential effects while maintaining stable output signals at the output terminal.
Data Source
AI summary
A shift register unit comprises a pull-up control module (1), a pull-up module (2), a pull-down control module (3) and a pull-down module (4), the pull-up control module (1) is connected to a first clock signal terminal (CLK1), a first voltage signal terminal (V1), a second voltage signal terminal (V2) and a pull-up control node (Aj), the pull-up module (2) is connected to the pull-up control node (A), the first voltage signal terminal (V1) and a signal output terminal (OUTPUT) of present stage, the pull-down control module (3) is connected to a second clock signal terminal (CLK2), a signal input terminal (INPUT) and a pull-down control node (B), and the pull-down module (4) is connected to the pull-down control node (B), the first clock signal terminal (CLK1) and the signal output terminal (OUTPUT) of present stage. There also disclose a gate driving circuit and a display device. The shift register unit can ameliorate a potential suspension problem existing in nodes of the shift register unit, so as to improve stability of an output signal.