OLED Display Panel Flicker Reduction via Adaptive Voltage Control
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Solution Overview
Problem
Existing OLED displays experience a screen flicker phenomenon due to voltage drops at the gate of the drive transistor when the refresh rate is changed, affecting image display quality.
Innovation Solution
The display panel incorporates a pixel drive circuit with control lines loaded with control signals, where the voltage difference value between maximum and minimum signal values is adjusted for different refresh rates to minimize total voltage drops across the drive transistor, thereby reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh rate of the OLED display is changed, then the image brightness can be adjusted, but the gate voltage of the drive transistor experiences different voltage drops causing screen flicker
Solution Approach 1:
The patent applies parameter changes by adjusting the control signal voltage difference values according to different refresh rates. Specifically, when switching from a first refresh rate to a second refresh rate, the voltage difference value of at least one control signal is modified to compensate for the changing voltage drops across the drive transistor, thereby maintaining stable gate voltage and eliminating screen flicker while preserving the ability to adjust image brightness through refresh rate changes
2Reliability
If the voltage difference value of control signals is adjusted for different refresh rates, then screen flicker is reduced, but the control system becomes more complex
Solution Approach 1:
The patent implements dynamics by making the control signal voltage difference values adaptive to different refresh rates. The control system dynamically adjusts the voltage difference values based on the detected or selected refresh rate, transforming a static control signal approach into a dynamic one that automatically compensates for voltage drop variations, thereby reducing screen flicker without requiring complex manual calibration or additional hardware components
Data Source
AI summary
The present disclosure provides a display panel and a display device, including a plurality of control lines and pixel drive circuits electrically connected to the plurality of control lines to be loaded with a plurality of control signals, wherein a difference value between a maximum value and a minimum value of each of the plurality of control signals is determined as a voltage difference value, each of the plurality of pixel drive circuits includes a drive transistor and a light emitting element electrically connected to each other, and for at least one control signal of the plurality of control signals, the voltage difference value corresponding to a larger second refresh rate is different from the voltage difference value corresponding to the smaller first refresh rate in the display panel.