Shift Register Unit Leakage Prevention via Node Reset
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Solution Overview
Problem
Shift register units in liquid crystal display gate driving devices require higher stability to ensure normal operation of liquid crystal displays, as abnormal functioning leads to display issues.
Innovation Solution
A shift register unit comprising an input circuit, pull-down control circuit, pull-up circuit, and reset circuit, with specific transistor configurations to control node potentials based on input signals and clock signals, preventing leakage currents and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple shift register units are connected to drive gate lines alternatively, then the gate driving device can control more gate lines, but the stability of each shift register unit becomes more critical and harder to maintain
Solution Approach 1:
The shift register unit is segmented into distinct functional circuits: input circuit, pull-up circuit, pull-down circuit, and reset circuit. Each circuit handles specific tasks independently, reducing interference between functions and improving overall stability while maintaining the capability to drive multiple gate lines alternatively.
Solution Approach 2:
The pull-down control node acts as an intermediary between the input circuit and pull-down circuit, mediating the control signals to ensure proper timing and level coordination. This intermediary mechanism prevents direct conflicts between different control signals and maintains stability during alternative driving operations.
2Duration of action of moving object
If the shift register unit operates continuously to drive gate lines, then the display can function without interruption, but leakage currents may accumulate and cause operation failure over time
Solution Approach 1:
The reset circuit periodically resets the pull-down control node to a predetermined potential level at specific timing intervals. This periodic reset action prevents leakage currents from accumulating during continuous operation, thereby maintaining operation stability over extended periods without interruption.
Solution Approach 2:
The reset circuit performs preliminary resetting of the pull-down control node before potential leakage accumulation occurs. By proactively maintaining the control node at the correct potential level, the system prevents operation failure before it can occur, enabling continuous reliable operation.
Data Source
AI summary
A shift register unit, gate driving device, display device and driving method are provided. The shift register unit includes: an input circuit, configured to control a potential of a pull-up control node based on an input signal; a pull-down control circuit, configured to control a potential of a pull-down control node based on the input signal and the potential of the pull-up control node when first signal is at a first level; a pull-down circuit, configured to pull down the potential of the pull-up control node based on the potential of the pull-down control node; a pull-up circuit, configured to control an output signal output from a signal output terminal based on the potential of the pull-up control node and the clock signal; and a reset circuit, configured to reset the output signal based on the potential of the pull-down control node when second signal is at a second level.