Shift Register Circuit for OLED Gate Drivers
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Solution Overview
Problem
Current gate driving circuits in OLED display devices are complex and cannot meet the requirements of high resolution and narrow borders, often resulting in output waveform anomalies.
Innovation Solution
A shift register unit circuit with a simplified structure, comprising sub-unit circuits and conduction control circuits, that generates and supplies gate driving signals by controlling node conduction based on input pulses, clock signals, and reset pulses, ensuring efficient signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simplified gate driving circuit structure is adopted, then device complexity is reduced, but output waveform anomalies occur
Solution Approach 1:
The gate driving circuit is divided into multiple independent shift register unit circuits, each capable of generating gate driving signals autonomously. Each unit contains separate input circuits, output circuits, and reset circuits that can be independently controlled, allowing the complex function to be distributed across multiple simpler modules rather than requiring a single complex circuit
2Ease of manufacture
If the gate driving circuit is simplified, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The circuit incorporates preliminary reset actions through dedicated reset pulses that prepare the circuit state before signal generation. The reset circuit proactively clears previous states and ensures the circuit is in a known good state before operating, preventing waveform anomalies from previous operations from affecting current signal accuracy
3Reliability
If a complex gate driving circuit is used, then output waveform quality is maintained, but device complexity increases
Solution Approach 1:
Multiple functional circuits (input circuits, output circuits, reset circuits) are merged into a single integrated shift register unit circuit structure. The cascaded connection allows these circuits to work together cooperatively, achieving reliable waveform output through coordinated operation rather than requiring separate complex circuits for each function
4Productivity
If the gate driving circuit is simplified, then productivity is improved, but signal output reliability deteriorates
Solution Approach 1:
Each shift register unit circuit is self-contained with its own input, output, and reset circuits that can operate autonomously. The circuit serves itself by internally managing signal generation and reset operations without requiring external complex control mechanisms, maintaining high productivity while ensuring reliable signal output through self-regulation
Data Source
AI summary
Provided are a shift register unit circuit and drive method, and a gate driver and a display device. The shift register unit circuit includes a first sub-unit circuit, a second sub-unit circuit, a third sub-unit circuit, and a fourth sub-unit circuit. Responsive to providing a corresponding input pulse and clock signal, the shift register unit circuit is configured output first, second, third, and fourth output signals. The shift register unit circuit is configured such that a fifth node is in conduction with a second node at least while the reset pulse is active.