Shift Register Voltage Regulation for Display Gate Stability
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Solution Overview
Problem
Current gate drive circuits in display apparatuses face instability in the voltage of the control terminal during the pull-down stage, leading to improper shutoff of gate lines due to influence from the display area's output, resulting in unstable voltage and potential issues with signal output.
Innovation Solution
A shift register unit circuit comprising an input sub-circuit, pull-up sub-circuit, pull-down control sub-circuit, pull-down sub-circuit, and voltage regulating sub-circuit, with the voltage regulating sub-circuit ensuring stable voltage during the pull-down stage through single-direction conduction, preventing voltage fluctuations and ensuring proper shutoff of gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull-down sub-circuit is used to discharge the output terminal during the pull-down stage, then the output can be reset, but the voltage of the control terminal becomes unstable due to influence from the display area
Solution Approach 1:
The patent introduces a voltage regulating sub-circuit as an intermediary between the pull-down control sub-circuit and the turn-down signal terminal. This intermediary component (comprising a voltage regulating transistor) isolates the control terminal from voltage fluctuations caused by the display area, allowing the pull-down function to work reliably without affecting voltage stability.
Solution Approach 2:
The patent changes the electrical parameters (voltage level) of the turn-down signal terminal through the voltage regulating sub-circuit. By dynamically adjusting the voltage parameter based on circuit state, the system maintains stable control terminal voltage while enabling proper pull-down operation.
2Reliability
If the control terminal voltage becomes unstable during pull-down stage, then the shutoff of gate lines becomes improper, but adding voltage regulation increases circuit complexity
Solution Approach 1:
The voltage regulating transistor serves multiple functions: it regulates voltage for the control terminal, enables proper pull-down operation, and ensures reliable gate line shutoff. By making this single component multi-functional, the patent achieves improved reliability without proportionally increasing circuit complexity.
Solution Approach 2:
The patent merges the voltage regulation function with the existing pull-down control structure by integrating the voltage regulating transistor into the turn-down signal path. This combination allows voltage stabilization and pull-down control to work together within a unified circuit architecture.
Data Source
AI summary
A shift register unit circuit includes an input sub-circuit, a pull-up sub-circuit, a pull-down control sub-circuit, a pull-down sub-circuit, and a voltage regulating sub-circuit. The input sub-circuit receives an input signal from a signal input terminal to control a potential of a pull-up node. The pull-up sub-circuit outputs a gate driving signal to an output terminal under control of the potential of the pull-up node and a signal from a first signal terminal. The pull-down control sub-circuit conducts a pull-down node with a first node under control of a signal from the second signal terminal. The pull-down sub-circuit conducts the pull-up node with the first node and the turn-down signal terminal with the output terminal under control of a potential of the pull-down node. The voltage regulating sub-circuit conducts the first node with the turn-down signal terminal under control of a potential of the first node.