GOA Circuit One-Way Feedback for Display Panel Integration
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Solution Overview
Problem
Conventional GOA circuits face challenges in being integrated into the active region of display panels due to complex inner feedback mechanisms, limiting their ability to achieve a no-side-frame design and meet the demands of modern device designs, such as full-screen cell phones and vehicle applications.
Innovation Solution
The introduction of a second feedback module in the GOA circuit, which controls node P based on the output of the current stage and node Q of the previous stage, transforming two-way feedback into one-way feedback, thereby increasing circuit stability and reducing complexity, allowing for easier integration and linear design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional GOA circuit with two-way feedback is used, then the circuit can maintain signal levels, but the circuit complexity increases and stability decreases
Solution Approach 1:
The patent extracts one direction of the feedback loop, transforming the two-way feedback mechanism into a one-way feedback mechanism. Specifically, the feedback path from node P to node Q is removed, keeping only the feedback from node Q to node P. This extraction simplifies the feedback structure while maintaining the essential function of signal level maintenance, thereby reducing circuit complexity and improving stability.
Solution Approach 2:
The patent inverts the feedback direction by eliminating the P→Q feedback path and retaining only the Q→P feedback path. This inversion transforms the bidirectional interaction into a unidirectional control relationship, where node Q's feedback to node P provides stable signal level control without the complexity of mutual feedback between nodes.
2Area of stationary object
If the GOA circuit is placed in the active area to achieve no-side-frame design, then the side frame size is reduced, but the integration difficulty increases due to complex feedback
Solution Approach 1:
By extracting the complex P→Q feedback path from the circuit, the patent reduces the overall complexity of the GOA circuit. This simplification makes the circuit more suitable for integration into the active area of the display panel, as the reduced complexity lowers the manufacturing and integration difficulty while enabling the no-side-frame design.
3Length of stationary object
If the two-way feedback mechanism is maintained, then signal level control is achieved, but the circuit width cannot be shrunk
Solution Approach 1:
The patent removes the redundant P→Q feedback path while retaining the essential Q→P feedback mechanism that controls signal levels. This extraction reduces the circuit width by eliminating unnecessary feedback components and interconnections, while the remaining Q→P feedback path continues to provide effective signal level control at the output node P.
Data Source
AI summary
A gate driver on array (GOA) circuit, a display panel and a display device are provided. The GOA circuit includes m cascaded GOA units. An nth-stage GOA unit includes a second feedback module. The second feedback module, electrically connected to the second node of the nth-stage GOA unit, a first node of the (n−1)th-stage GOA unit, the clock signal of the (n+1)th-stage GOA unit, a gate driving signal of the nth-stage GOA unit and the constant low voltage signal, to pull down voltage applied on a second node of the nth-stage GOA unit. The one-way feedback could achieve the linear design more easily, raise the circuit stability, and thus the GOA circuit could be integrated in the display panel more easily to achieve the design of placing the GOA circuit in the active area.