Display Panel Voltage Compensation for Flicker and Image Sticking
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Solution Overview
Problem
Liquid crystal display panels using in-plane switching techniques often experience image residual and flicker issues due to uneven feed-through voltages, which conventional capacitance compensation methods fail to adequately address.
Innovation Solution
A display panel control method that compensates for display voltage by calculating and applying differences between first and second feed-through voltages generated by transistors in pixel units, using formulas to determine these voltages and adjust data or common voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitance compensation voltage is connected in series between gate and source of driving transistor, then image residual phenomenon is improved, but flicker and image sticking occur due to uneven feed-through voltages
Solution Approach 1:
The invention divides the compensation mechanism into two separate parts: a first compensation capacitor connected to the gate of the first transistor and a second compensation capacitor connected to the gate of the second transistor. This segmentation allows independent compensation of feed-through voltages for each transistor, enabling precise control over voltage distribution and eliminating the unevenness that causes flicker and image sticking while maintaining improvement in image residual phenomenon.
2Speed
If conventional capacitance compensation is used, then voltage change timing is improved, but voltage uniformity deteriorates due to capacitance coupling effects
Solution Approach 1:
The invention applies different compensation values to different locations in the circuit. Specifically, the first compensation capacitor has a first compensation value for the first transistor, and the second compensation capacitor has a second compensation value for the second transistor. These compensation values are specifically designed to counteract the local capacitance coupling effects at each transistor location, thereby achieving voltage uniformity across the pixel unit while maintaining proper voltage change timing.
3Device complexity
If feed-through voltages are not compensated, then device complexity is reduced, but display quality deteriorates due to flicker and image sticking
Solution Approach 1:
The invention utilizes the existing gate electrodes of the first and second transistors to serve dual functions: as control electrodes for transistor operation and as connection points for compensation capacitors. This self-service approach allows the compensation function to be integrated into the existing transistor structure without adding significant complexity, while effectively eliminating feed-through voltage effects and improving display quality.
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
This approach effectively reduces flicker and image sticking by compensating for voltage differences, improving display quality by ensuring more uniform feed-through voltages across the panel.
Implementation Method 1
a pixel electrode generates a first feed-through voltage when a first transistor is changed from an on state to an off state
Implementation Method 2
a common electrode generates a second feed-through voltage when a second transistor is changed from the on state to the off state
Data Source
AI summary
The present application provides a display panel control method and a display module. A display voltage corresponding to corresponding pixel unit can be compensated for based on a difference between a first feed-through voltage generated by a pixel electrode when a first transistor is turned from on to off and a second feed-through voltage generated by a common electrode when a second transistor is turned from on to off, so as to improve the problem such as the flicker or the image sticking in the display picture due to the unevenness of the feed-through voltages.