Gate Driving Circuit With Cross-Coupled Switches for Stress Balance
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Solution Overview
Problem
In Low-temperature polysilicon (LTPS) thin-film transistor liquid crystal displays, the non-uniform stress on transistors due to different operational conditions leads to signal latching and logic errors, affecting the normal operation and stability of the gate driving circuit.
Innovation Solution
A gate driving circuit design with parallel switch modules and crosswise connected control terminals of switching tubes, including clock-controlled inverters and NAND gates, to equalize stress on transistors, enhancing circuit uniformity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple connection way of the latch unit and NAND gate is used, then the device complexity is reduced, but the uniformity of transistor stress distribution deteriorates, causing signal latching errors and logic errors
Solution Approach 1:
The patent applies asymmetry by introducing a stress equalization circuit that deliberately changes the symmetric stress distribution into an asymmetric compensation structure. The first and second transistors in the latch unit are compensated through additional control signals that create asymmetric stress equalization, ensuring uniform stress distribution across all transistors despite their different operational conditions. This resolves the reliability issue without significantly increasing overall circuit complexity.
2Ease of operation
If different stress conditions are sustained on transistors during long-time operation, then the ease of operation is maintained, but the uniformity of transistor characteristics deteriorates, causing signal latching errors and logic errors
Solution Approach 1:
The patent implements feedback mechanisms through stress equalization circuits that monitor and adjust the stress conditions on transistors. The first and second clock-controlled inverters receive control signals that feedback the stress states of transistors, automatically adjusting operating parameters to maintain uniform stress distribution. This feedback system ensures transistor characteristic uniformity without complicating the ease of operation, as the equalization occurs automatically during normal circuit operation.
Data Source
AI summary
A gate driving circuit and a liquid crystal display are disclosed. The gate driving circuit includes: an input and latch circuit, a signal processing circuit electrically connected with the input and latch circuit and an output buffering circuit electrically connected with the signal processing circuit. Wherein, the input and latch circuit or the signal processing circuit includes two switch modules which are disposed in parallel. Each switch module includes two switching tubes disposed in series, control terminals of the two switching tubes of one of the two switch modules are crosswise connected with control terminals of the two switching tubes of the other of the two switch modules. The present invention through disposing two switch modules and crosswise connecting the control terminals of the switching tubes, the stress degrees applied on the two switching transistors are the same so as to greatly increase the stability of the circuit operation.