GOA Circuit for Wide and Narrow Pulse Width Signals
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Solution Overview
Problem
Conventional GOA circuits for large size AMOLED display panels cannot simultaneously output pulse signals of different pulse widths, limiting their ability to achieve the desired pulse width variability required for advanced OLED display technologies.
Innovation Solution
A GOA circuit design featuring cascaded GOA circuit sharing units with specific configurations of thin film transistors and power supply connections, including pull-up and pull-down units, feedback mechanisms, and a bootstrap capacitor, enabling the simultaneous output of wide and narrow pulse width signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional GOA circuit is used for large size AMOLED display panels, then the circuit structure is simple and manufacturing is easier, but the circuit cannot simultaneously output pulse signals of different pulse widths
Solution Approach 1:
The GOA circuit is divided into multiple cascaded sharing units, where each unit can independently generate different pulse widths. The first sharing unit generates a first pulse signal with a first pulse width, while the second sharing unit generates a second pulse signal with a second pulse width different from the first. This segmentation allows each unit to be optimized for specific pulse width requirements.
Solution Approach 2:
The cascaded sharing units are designed to perform multiple functions: they can generate different pulse widths, provide feedback signals, and maintain signal integrity across the cascade. Each unit serves as both an output stage for its specific pulse width and as an input stage for the next unit, creating a multi-functional circuit that replaces what would traditionally require separate dedicated circuits.
2Adaptability or versatility
If external compensation technology is adopted for large size AMOLED display panels, then pixel circuits can be properly driven, but the GOA circuit cannot output suitable pulse signals for different pulse width requirements
Solution Approach 1:
The circuit employs dynamic control mechanisms where the cascaded sharing units can adaptively generate different pulse widths based on the specific requirements of the display panel. The feedback signals from subsequent stages allow the circuit to dynamically adjust its output characteristics, ensuring reliable signal generation for both wide and narrow pulse width requirements.
Solution Approach 2:
The second sharing unit provides feedback signals to the first sharing unit, creating a closed-loop control system. This feedback mechanism ensures that the pulse signals generated are suitable for the specific requirements of the display panel, allowing the circuit to maintain reliability while providing the necessary pulse width variability for external compensation operations.
Data Source
AI summary
A gate driver on array (GOA) circuit is provided that can simultaneously output a wide pulse width signal and a narrow pulse width signal, such that thin film transistors in the GOA circuit can be operated in a saturation area, which is adaptable to an application of external compensation of large size active-matrix organic light-emitting diode display panels.