GOA Driver Circuit Transistor Reduction via Merging
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Solution Overview
Problem
The existing gate driver on array (GOA) driver circuits in liquid crystal displays (LCDs) require a large number of transistors, which is inefficient and needs to be reduced without compromising functionality.
Innovation Solution
The proposed GOA driver circuit comprises cascaded units with a pull-up module, pull-down holding module, transferring module, and bootstrap capacitor module, where transistors are time-shared to minimize the number of transistors used, specifically allowing the fifth, seventh, and tenth transistors to work effectively while reducing the overall transistor count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional GOA driver circuit design is used, then the circuit can perform gate driver functions, but the number of transistors required is large
Solution Approach 1:
The patent combines multiple transistor functions into shared components. Specifically, the pull-down transistors of adjacent GOA units share common nodes (Pn and Pn+1), allowing transistors to serve dual purposes across different scanning stages. This merging approach directly reduces the total transistor count while maintaining complete gate driver functionality for all horizontal scan lines.
Solution Approach 2:
The patent implements multi-functional transistors where the same transistor components perform different functions at different time periods. The pull-down transistors controlled by alternating clock signals (LCn and LCn+1) sequentially serve multiple GOA units, making each transistor universal rather than dedicated to a single function or stage.
2Productivity
If the number of transistors is reduced, then manufacturing efficiency improves, but circuit functionality may be compromised
Solution Approach 1:
The patent employs periodic clock signals (LCn and LCn+1) that alternate in phase to control the sequential operation of shared transistors. This periodic action ensures that at any given time, the necessary transistors are activated to maintain proper gate driver functionality, while over the complete cycle, the same components serve multiple functions, reducing total component count without sacrificing reliability.
Data Source
AI summary
A gate driver on array (GOA) driver circuit and a liquid crystal display are proposed. The GOA driver circuit includes cascaded GOA units. A gate driver signal is output to an Nth-stage horizontal scan line Gn on a display zone according to an Nth-stage GOA unit output gate driver signal. The Nth-stage GOA unit includes a pull-up module, a pull-up control module, a pull-down holding module, a transferring module, and a bootstrap capacitor module.