AMOLED Sub-Pixel Compensation for Voltage Offset Banding
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Solution Overview
Problem
AMOLED display panels face reliability issues due to potential offsets in low-voltage power supply signals causing inaccurate compensation and lateral bright/dark bands during picture display, especially when different currents flow through the OLED.
Innovation Solution
A compensation method for AMOLED display panels that includes determining voltage offset values for each sub-pixel based on their weights and material characteristics, and applying compensation values to adjust luminance accurately, thereby reducing the impact of parasitic capacitance and voltage offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation is used with real-time detection in pixel circuits, then mobility compensation can be performed, but voltage offsets from different OLED currents cause unreliable compensation and lateral bright/dark bands
Solution Approach 1:
The patent divides the display panel into multiple virtual display regions (first virtual display region and second virtual display region) corresponding to different physical regions. By segmenting the display area and calculating voltage offsets separately for each region based on regional current characteristics, the patent eliminates the interference of global voltage offsets on detection accuracy, thereby improving both compensation reliability and measurement precision simultaneously
Solution Approach 2:
The patent applies different voltage offset values to different virtual display regions based on their specific current characteristics. Instead of using a uniform compensation approach, the system calculates and applies region-specific voltage offsets that match the local OLED current conditions, ensuring accurate compensation without the lateral bright/dark band artifacts caused by uniform compensation
2Adaptability or versatility
If different currents flow through OLED for different pictures, then display flexibility is improved, but potential offset of low-voltage power supply signal causes compensation errors
Solution Approach 1:
The patent dynamically adjusts the voltage offset values for different virtual display regions based on the actual current flowing through OLEDs in each region. The system calculates voltage offsets in real-time according to the displayed picture content and regional current characteristics, allowing the compensation parameters to adapt dynamically to different display scenarios while maintaining high compensation accuracy
Solution Approach 2:
The patent changes the voltage offset parameter values according to different display regions and current conditions. By calculating and applying different voltage offset values (first voltage offset value and second voltage offset value) for different virtual display regions, the system maintains compensation accuracy across various picture types and current levels, resolving the conflict between display flexibility and compensation reliability
Data Source
AI summary
A compensation method for a display panel includes: obtaining display data of the display panel for a current frame; determining a voltage offset value of the display panel corresponding to the current frame based on the display data; determining a first compensation value for a first sub-pixel based on a first weight of the first sub-pixel and the voltage offset value, and determining a second compensation value for a second sub-pixel based on a second weight of the second sub-pixel and the voltage offset value; and compensating for a first luminance of the first sub-pixel based on the first compensation value, and compensating for a second luminance of the second sub-pixel based on the second compensation value.