Display Panel Variable Refresh Rate Brightness Consistency
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Solution Overview
Problem
Display panels using variable refresh rate technology experience brightness changes that are noticeable to human eyes, particularly at low gray scales, leading to user discomfort and eye fatigue due to transistor leakage and hysteresis effects.
Innovation Solution
A driving method that detects the display panel's entry into variable refresh rate mode, adjusts the first level voltage of the scan signal in the blanking phase to reduce current through light emitting elements, maintaining consistent brightness across different refresh rates by increasing or decreasing the high or low level voltage of the scan signal based on transistor type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If variable refresh rate technology is used to save power consumption, then power efficiency is improved, but brightness consistency deteriorates due to transistor leakage and hysteresis effects
Solution Approach 1:
The patent applies preliminary action by adjusting the initialization voltage before the light emitting element emits light. By pre-adjusting the voltage level in the pixel circuit before the actual light emission occurs, the brightness inconsistency caused by transistor leakage and hysteresis is compensated in advance, ensuring consistent brightness across different refresh rates while maintaining power savings.
2Adaptability or versatility
If refresh rate is changed to optimize performance, then system adaptability is improved, but brightness stability deteriorates causing user discomfort
Solution Approach 1:
The patent implements dynamics by dynamically adjusting the initialization voltage according to the current refresh rate. The voltage adjustment amount is determined based on the detected refresh rate, allowing the system to adapt to different refresh rates while maintaining stable brightness. This dynamic adjustment mechanism enables the display to switch between refresh rates without visible brightness changes, enhancing both adaptability and brightness stability.
3Use of energy by moving object
If voltage adjustment is applied during blanking phase to reduce current, then power efficiency is improved, but display brightness uniformity worsens
Solution Approach 1:
The patent applies local quality by adjusting only the initialization voltage in the pixel circuit during the blanking phase, while leaving other voltage signals unchanged. This localized voltage adjustment specifically targets the initialization stage where transistor leakage and hysteresis effects occur, reducing power consumption during the blanking phase without affecting the overall brightness uniformity of the displayed image.
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 method reduces brightness fluctuations caused by refresh rate changes, improving user experience by maintaining consistent display brightness and reducing eye strain.
Implementation Method 1
The scan signal acts on the control terminals of the remaining transistors, and in the blanking phase, the adjusted first level voltage of the scan signal reduces the current flowing through the light emitting element, through the parasitic capacitance generated by the remaining transistors in the pixel circuit.
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides driving methods of a display panel and a display device.