GOA Circuit Reducing Transistor Count for Narrow Bezel Displays
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Solution Overview
Problem
Conventional gate driver on array (GOA) circuits in display technology require a large number of transistors, which occupies significant space on the glass substrate, making it difficult to achieve a narrow frame design and increasing the risk of image sticking due to residual charges in pixel capacitors.
Innovation Solution
A GOA circuit comprising a series of units with a reduced number of transistors (ten transistors per unit) is proposed, including specific configurations for input control, output control, pull-down, and pull-up holding modules, which utilize clock signals and gate turn-on signals to efficiently manage scanning signals and reduce leakage current, allowing for a more compact and stable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional GOA circuits are used with more transistors, then the circuit can perform basic scanning functions, but the occupied area on the glass substrate increases, making narrow frame design difficult
Solution Approach 1:
The patent combines multiple functions into shared transistors. Specifically, the first transistor's source is connected to the second transistor's drain, and the fourth transistor's source is connected to the third transistor's drain, creating shared nodes that reduce the total transistor count while maintaining scanning functionality across multiple gate lines.
Solution Approach 2:
The GOA circuit unit is designed to handle multiple gate lines (G1-G4) using a standardized configuration of ten transistors. This multi-functional design allows the same circuit pattern to be replicated for different gate lines, reducing overall area while maintaining reliability through consistent design.
2Reliability
If the GOA circuit is suspended to output scanning signals for touch panel operation, then the touch panel can function properly, but residual charges remain in pixel capacitors causing image sticking
Solution Approach 1:
The circuit incorporates a preliminary discharge action through the pull-down module activated by the fourth clock signal. Before the GOA circuit is suspended for touch operation, this module ensures residual charges are cleared from pixel capacitors, preventing image sticking while maintaining touch functionality.
Solution Approach 2:
The GOA circuit maintains continuous charge clearance capability through the pull-down module that operates during the suspension period. The circuit design ensures that even when scanning is suspended for touch input, the charge clearance function remains active, preventing image sticking without interrupting touch panel operation.
Data Source
AI summary
A GOA circuit includes GOA circuit units coupled in series. Each GOA circuit unit includes an input control module, an output control module, a pull-down module, and a pull-up holding module. The input control module includes a first transistor, a second transistor, a third transistor, and a fourth transistor. Each GOA circuit unit includes ten transistors. Because the GOA circuit unit proposed by the present invention comprises fewer transistors, it is good for being used in displays with a narrow bezel. In addition, the GOA circuit unit comprises an input control module comprising a second transistor and a third transistor controlled by a first gate turn-on signal. A first transistor and the second transistor are connected in series, and the third transistor and a fourth transistor are connected in series, which reduces leakage current. It provides a beneficiary effect that the stability of the GOA circuit unit is improved.