GOA Circuit Switching for LCD Leakage Prevention
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Solution Overview
Problem
Conventional gate on array (GOA) circuits are unable to realize the all-gate-on function effectively, leading to electricity leakage and instability when waking up the black screen of a liquid crystal display (LCD) and requiring improvements in signal suspension and circuit stability.
Innovation Solution
The proposed GOA circuit incorporates a first and second switch circuit on each GOA unit, utilizing enabling signals to turn on and off thin-film transistors (TFTs) connected to scanning lines, ensuring proper signal levels are maintained to prevent electricity leakage and enhance circuit stability during the all-gate-on stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GOA circuit is used during all-gate-on stage, then the circuit structure is simple, but the circuit cannot realize all-gate-on function effectively causing electricity leakage and instability
Solution Approach 1:
The GOA circuit is divided into multiple GOA units (first GOA unit, second GOA unit, etc.) connected in cascade, with each unit containing independent switch circuits (first switch circuit, second switch circuit) that can be controlled separately. This segmentation allows precise control of each gate during the all-gate-on stage, ensuring reliable operation while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The first switch circuit is activated in advance before the all-gate-on stage begins, pre-establishing the necessary signal pathways. The first enabling signal is input to the first switch circuit before the LCD shows images, ensuring that gates are properly turned on and signal leakage is prevented before the actual display operation starts.
2Adaptability or versatility
If signal suspension is implemented for touch panel compatibility, then the LCD can work with touch panel, but the black screen cannot be woken up properly
Solution Approach 1:
The switch circuits dynamically change their state based on control signals. During normal operation, the first switch circuit blocks the all-gate-on signal to enable touch panel functionality. When wake-up is required, the second switch circuit is activated to allow the all-gate-on signal to pass through, dynamically transitioning the system between different operational modes without compromising either function.
Solution Approach 2:
The first switch circuit and second switch circuit act as intermediaries between the signal source and the gates. These switch circuits mediate the interaction between the all-gate-on signal and the pixel TFTs, allowing the system to selectively enable or disable gate control based on operational requirements (touch panel mode vs. wake-up mode).
3Loss of energy
If all-gate-on function is not realized, then the circuit structure remains simple, but electricity leaks during black screen wake-up
Solution Approach 1:
The wake-up function is extracted as a separate controllable feature from the normal display operation. By using the first switch circuit to block the all-gate-on signal during normal operation and the second switch circuit to enable it during wake-up, the patent isolates the energy leakage issue to specific time periods when wake-up is needed, rather than continuously managing complexity throughout all operational states.
Data Source
AI summary
A gate on array (GOA) circuit for used in an LCD includes GOA units connected in cascade. An Nth GOA unit includes an Nth stage-transmittance circuit, an Nth Q-node controlling circuit, an Nth P-node controlling circuit, an Nth outputting circuit, and a first switch circuit where N is a positive integer. The first switch circuit connected to the Nth scanning line, for inputting an enabling signal to the Nth scanning line before the LCD shows images so as to turn on a TFT in a pixel which the Nth scanning line is connected to. The benefit of the function is that the display does not leak electricity when the black screen is woken up and that the stability of the circuit is enhanced at the same time.