Shift Register Switch Device Reduces Leakage Currents
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Solution Overview
Problem
Traditional liquid crystal displays (LCDs) face high power consumption and reduced panel lifetime due to reverse leakage currents from thin film transistors, and integrating shift register circuits in display panels with gate-driver on array (GOA) architecture leads to low signal transmitting ability and degraded display quality.
Innovation Solution
A shift register circuit with a bi-directional or single-directional scan mechanism utilizing a switch device structure comprising multiple transistors to reduce turn-on resistance and suppress reverse leakage currents, enhancing driving ability and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional thin film transistors are used in liquid crystal displays, then the display can be manufactured with standard processes, but reverse leakage currents cause high power consumption and high panel working temperature
Solution Approach 1:
The patent changes the electrical parameters of the switch device by using a dual-gate transistor structure where the second gate can independently control the channel conductivity. By adjusting the voltage applied to the second gate, the device can operate in different modes (enhancement mode, depletion mode, or cutoff) to minimize reverse leakage current while maintaining driving capability, thus reducing power consumption and heat generation without sacrificing reliability
2Reliability
If shift register stages are sequentially arranged in a lengthy border area to enable direct connection to gate lines, then integration is achieved, but low signal transmitting ability degrades panel display quality
Solution Approach 1:
The patent merges multiple functions into the dual-gate transistor structure: the first gate handles signal input from previous stages, the second gate provides signal from the same stage, and the combined output drives the gate line. This integrated approach enhances signal transmitting ability by utilizing both gates simultaneously while maintaining a compact layout that reduces border area requirements
Data Source
AI summary
A shift register circuit includes plural shift register stages for providing plural gate signals. Each shift register stage includes an input unit and a pull-up unit. The pull-up unit is utilized for pulling up a gate signal according to a system clock and a driving control voltage. The input unit is employed for outputting the driving control voltage according to a control signal and an input signal. The input unit includes a switch device having a first transistor and a second transistor. The first transistor has a first end for receiving the input signal, a gate end for receiving the control signal, and a second end. The second transistor has a first end electrically connected to the second end of the first transistor, a gate end electrically connected to the first end of the first transistor, and a second end for outputting the driving control voltage.