GOA Drive Circuit Power-Off Afterimage Neutralization
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Solution Overview
Problem
The Gate On Array (GOA) technology in liquid crystal display (LCD) architectures faces challenges in resolving power-off afterimage issues due to residual charges, which affect product quality and competitiveness.
Innovation Solution
A drive circuit comprising a trigger circuit, current limiting circuit, and switching circuits is designed to control the switching on and off of TFTs in the display panel, ensuring all TFTs are turned on to neutralize charges during power-off, thereby preventing afterimage. This circuit includes a trigger circuit, a current limiting circuit, and two switching circuits, where the first switching circuit is activated when the second is deactivated, and vice versa, using preset and input voltages to manage the switching states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GOA technology is used to reduce cost and achieve ultra-narrow frame, then manufacturing cost is reduced and frame width is minimized, but power-off afterimage cannot be resolved due to inability to turn on all TFTs during power-off
Solution Approach 1:
The patent segments the control function by dividing the switching circuits into multiple independent circuits (first switching circuit and second switching circuit), each controlled by separate control signals. This allows selective activation of different TFT groups during power-off state, enabling charge neutralization without requiring a complete redesign of the GOA architecture, thus maintaining cost efficiency while resolving the afterimage issue.
Solution Approach 2:
The patent introduces an intermediary mechanism through the dual switching circuit configuration, where the second switching circuit acts as a mediator to activate specific TFTs during power-off state. This intermediary control system enables charge neutralization in pixel electrodes without requiring full activation of all TFTs, resolving the afterimage problem while maintaining the cost benefits of GOA technology.
2Reliability
If all TFTs are turned on during power-off to neutralize charges, then power-off afterimage is prevented, but power consumption increases
Solution Approach 1:
The patent applies local quality by activating only specific TFTs through the second switching circuit during power-off state, rather than turning on all TFTs uniformly. This localized activation is sufficient to neutralize charges in pixel electrodes and prevent afterimage, while minimizing overall power consumption by leaving other TFTs in their previous state.
Solution Approach 2:
The patent implements partial action by using the second switching circuit to activate only the necessary subset of TFTs required for charge neutralization during power-off. This partial activation achieves the sufficient effect of preventing afterimage without the excessive power consumption that would result from activating all TFTs across the entire display panel.
3Reliability
If dual switching circuits are added to enable power-off afterimage resolution, then product quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the additional switching control functionality into the existing GOA driver structure by integrating the first and second switching circuits within the array substrate. This merging approach allows the dual switching circuit system to be implemented without requiring separate external control circuits, thereby improving product quality while limiting the increase in overall device complexity.
Solution Approach 2:
The patent achieves multi-functionality by designing the switching circuits to perform multiple roles: during normal operation, they function as part of the standard GOA driving mechanism, and during power-off state, they enable charge neutralization and afterimage prevention. This universal design allows a single circuit configuration to handle both normal driving and power-off management, improving product quality without proportionally increasing device complexity.
Data Source
AI summary
A driving circuit of a display panel includes a trigger circuit, a current limiting circuit, and first and second switch circuits. A preset voltage and a first voltage are input the trigger circuit. The current limiting circuit is electrically connected to a power source. The first switch circuit is electrically connected to the trigger circuit and the current limiting circuit separately. The first switch circuit is electrically connected to a driving chip and the display panel (320). The second switch circuit (400) is electrically connected to the trigger circuit and the current limiting circuit separately. An output terminal of the second switch circuit is electrically connected to the display panel.