Display Panel Drive Circuit for Power-Off Afterimage Elimination
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Solution Overview
Problem
The Gate-on-Array (GOA) technology in liquid crystal display (LCD) systems faces challenges in eliminating power-off afterimages due to residual charges, which conventional architectures cannot effectively address.
Innovation Solution
A drive circuit is designed comprising an energy storage circuit, a comparator-based control circuit, a current limiting circuit, and switching transistors to manage voltage and current flows, ensuring that all TFTs in the display panel are turned on to neutralize charges when the system is powered off, thereby preventing afterimages.
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 problem cannot be solved
Solution Approach 1:
The patent segments the gate driving function into two independent parts: the GOA circuit integrated on the array substrate for basic gate driving, and a separate XAO circuit on a dedicated chip for afterimage elimination. This segmentation allows each part to perform its specialized function optimally while maintaining the cost and frame width benefits of GOA technology.
Solution Approach 2:
The patent introduces an intermediary switching circuit that controls the connection between the GOA output and the display panel. This switching circuit acts as a mediator that can redirect the gate driving signals to either the display panel or the pixel electrodes for charge neutralization, enabling afterimage elimination without compromising the integrated GOA architecture.
2Reliability
If XAO function is integrated into G-COF architecture, then power-off afterimage can be eliminated, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the XAO function from the integrated G-COF architecture and places it on a separate chip. This extraction simplifies the array substrate design and manufacturing while maintaining the afterimage elimination capability. The separate XAO chip can be independently optimized and manufactured.
Solution Approach 2:
The patent designs the switching circuit to handle multiple functions: during normal operation it routes gate driving signals from the GOA circuit to the display panel, and during power-off it routes signals to neutralize charges in pixel electrodes. This multi-functionality reduces the need for separate dedicated circuits.
3Reliability
If switching circuit is added to control TFT turning on/off, then charge neutralization capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the switching control functionality with the existing GOA circuit output stage. The switching circuit utilizes the same signal lines and control logic as the normal gate driving, combining charge neutralization control with the existing gate driving infrastructure rather than adding completely separate control pathways.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively eliminates power-off afterimages, enhancing the quality and competitiveness of the display panel by ensuring that residual charges are neutralized, thus improving the overall performance and reliability of the display device.
Implementation Method 1
an energy storage circuit; a first circuit, wherein a first preset voltage is input through a first input end of the first circuit, a second preset voltage is input through a second input end of the first circuit and the second input end of the first circuit is electrically connected to the energy storage circuit
Implementation Method 2
a comparator, wherein the first preset voltage is input through a first input end of the comparator, the second preset voltage is input through a second input end of the comparator
Implementation Method 3
a first switching circuit, wherein a first input end of the first switching circuit is electrically connected to an output end of the first circuit and an output end of the current limiting circuit respectively
Data Source
AI summary
Disclosed is a driving circuit, comprising an energy storage circuit, a first circuit, a current limiting circuit, a first switching circuit, and a second switching circuit. A first preset voltage and a second preset voltage are input by means of the first circuit. The first circuit is electrically connected to the energy storage circuit. The current limiting circuit is electrically connected to a power supply. The first switching circuit is separately electrically connected to the first circuit and the current limiting circuit. The first switching circuit is electrically connected to output ends of a display panel and a driving chip. The second switching circuit is electrically connected to the first circuit and the current limiting circuit. An output end of the second switching circuit is electrically connected to the display panel. Also provided is a display device.