Shift Register Unit Leakage Current Reduction
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Solution Overview
Problem
The existing shift register units in liquid crystal displays experience increased power consumption due to leakage currents caused by the coupling effect of transistors, leading to higher energy expenditure in the gate drive technology.
Innovation Solution
The proposed shift register unit design connects the drain and gate of specific thin film transistors to the second clock signal input terminal, preventing leakage currents during high-level gate drive signals, and simplifies the structure by omitting unnecessary transistors and capacitors, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shift register unit uses a conventional design with multiple transistors and capacitors to maintain signal levels, then the signal stability is improved, but the power consumption increases due to leakage currents
Solution Approach 1:
The patent removes the capacitor and associated leakage current paths from the conventional shift register design. By extracting the capacitive element that causes leakage, the design eliminates the source of excessive power consumption while maintaining signal stability through alternative transistor configuration and timing control
Solution Approach 2:
The patent changes the operational parameters by controlling the timing and level of clock signals applied to different transistor gates. By dynamically adjusting signal levels and timing sequences, the design maintains stable operation without relying on capacitive charge storage that causes leakage
2Power
If the shift register unit connects multiple transistors in parallel to handle clock signals, then the signal driving capability is improved, but the leakage current increases causing higher power consumption
Solution Approach 1:
The patent employs dynamic control of transistor switching through phased clock signals. By sequentially activating different transistor paths rather than keeping multiple transistors continuously conductive, the design maintains strong signal driving capability during active periods while minimizing leakage during transition and hold periods
Solution Approach 2:
The patent uses periodic clock signaling with specific phase relationships to control transistor switching. The alternating high and low clock signals are applied in a periodic sequence that drives the shift register operation while ensuring transistors are fully off during non-active periods, thereby reducing leakage current
Data Source
AI summary
An embodiment of the present invention discloses a shift register unit and a gate drive device for a liquid crystal display. The shift register unit, on the basis of a structure of 12 transistors and 1 capacitor in the prior art, enables both the drain of the seventh thin film transistor and the gate and the drain of the ninth thin film transistor being connected to the second clock signal input terminal, such that a leakage current would not be generated among the seventh thin film transistor, the eighth thin film transistor, the ninth thin film transistor and the tenth thin film transistor when a high level signal is outputted from the shift register unit, thus power consumption of the shift register unit may be reduced.