Display Driving Circuit With Local Channel-Length Tuning
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Solution Overview
Problem
The channel length of transistors in driving circuits cannot be adjusted according to the current generated by the transistor, leading to poor transistor stability and instability in the driving circuit.
Innovation Solution
The driving circuit includes a pull-up node control circuit, a pull-down node control circuit, and an output circuit, with specific channel lengths and spacings designed for transistors to improve stability, allowing for controlled potential regulation and enhanced output signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel length of transistors is increased to improve stability, then the transistor stability improves, but the transistor current generation capability deteriorates
Solution Approach 1:
The patent applies different channel lengths to different transistors based on their specific functional requirements. Transistors requiring high stability (such as those in the output circuit and control circuits) are designed with longer channel lengths, while transistors requiring high current generation capability are designed with shorter channel lengths. This localized differentiation resolves the contradiction by optimizing each transistor's performance for its specific role rather than using a uniform channel length across all transistors.
2Device complexity
If the channel length is uniformly set for all transistors, then the device complexity is reduced, but the driving circuit stability deteriorates
Solution Approach 1:
The patent implements local differentiation of channel lengths across the driving circuit based on functional requirements. The output circuit transistors use longer channel lengths for stability, while control circuit transistors use shorter channel lengths for responsiveness. This localized optimization improves driving circuit stability without requiring complete redesign of all transistors, thus managing complexity effectively.
3Measurement precision
If the channel length is increased for current control, then the control precision improves, but the transistor current generation capability deteriorates
Solution Approach 1:
The patent applies longer channel lengths specifically to transistors in the output circuit and control circuits where precise current control is critical, while maintaining shorter channel lengths in transistors primarily responsible for current generation. This localized approach allows high control precision where needed without sacrificing overall current generation capability of the driving circuit.
Data Source
AI summary
A driving circuit includes a pull-up node control circuit, a pull-down node control circuit and an output circuit; the pull-up node control circuit controls a potential of the pull-up node under the control of an input signal and a reset signal; the output circuit controls the output terminal to output a signal under the control of the potential of the pull-up node and the potential of the pull-down node; a channel length of at least one transistor among at least some transistors included in the output circuit, at least some transistors whose gate electrodes are electrically connected to the input terminal included in the pull-up node control circuit, and at least some transistors whose gate electrodes are electrically connected to the reset terminal included in the pull-up node control circuit is greater than a channel length of another transistor included in the driving circuit.