AMOLED Display Luminance Compensation via Photosensitive Detection
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Solution Overview
Problem
AMOLED display apparatuses suffer from non-uniform luminance due to manufacturing variations, threshold voltage shifts, and resistance drops, leading to the Mura phenomenon, where displayed images exhibit uneven brightness.
Innovation Solution
A display apparatus comprising sub-pixels, photosensitive assemblies, and a processor that detects actual luminance values and generates a display compensation map to adjust pixel voltages, ensuring uniform luminance by compensating for variations and shifts, thereby addressing the Mura phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AMOLED display apparatuses are manufactured with standard processes, then manufacturing cost is reduced and production efficiency is improved, but manufacturing precision deteriorates due to variations in sub-pixel luminance
Solution Approach 1:
The patent applies preliminary action by measuring and storing the actual luminance values of sub-pixels during the manufacturing process, then using these measurements to generate compensation data that corrects luminance non-uniformity. This preliminary measurement and compensation approach allows standard manufacturing processes to be used while still achieving uniform display quality.
Solution Approach 2:
The patent changes the electrical parameters (voltage or current) of individual sub-pixels based on their measured luminance characteristics. By adjusting these parameters, the display apparatus compensates for manufacturing variations and achieves uniform luminance across all sub-pixels without requiring stricter manufacturing controls.
2Manufacturing precision
If compensation circuits are added to each sub-pixel to correct luminance variations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing pixel driving circuits multi-functional by enabling them to perform both normal display driving and luminance compensation functions. The same circuits that drive the OLED sub-pixels are also used to apply compensation voltages or currents, eliminating the need for separate compensation circuits and reducing overall device complexity.
Solution Approach 2:
The display apparatus performs self-diagnosis and self-correction by measuring its own sub-pixel luminance characteristics and automatically generating compensation data. This self-service approach eliminates the need for external compensation devices or complex additional circuitry, as the system compensates for its own manufacturing variations.
3Measurement precision
If multiple measurement points are used to detect sub-pixel luminance, then measurement precision is improved, but loss of time increases due to extended calibration duration
Solution Approach 1:
The patent uses a limited number of strategic measurement points (such as corner regions of the display panel) to detect sub-pixel luminance characteristics. Rather than measuring every sub-pixel, this partial measurement approach achieves sufficient precision for generating effective compensation data while significantly reducing calibration time compared to comprehensive full-panel measurements.
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 compensates for luminance variations, improving the uniformity of displayed images by accurately detecting and adjusting sub-pixel luminance, thus enhancing the display quality and reducing the Mura effect.
Implementation Method 1
Each photosensitive assembly is configured to detect and output actual luminance value(s) of at least one sub-pixel
Data Source
AI summary
A display apparatus and a control method are disclosed. The display apparatus includes a plurality of sub-pixels, at least one photosensitive assembly, and a processor. Each photosensitive assembly is configured to detect and output actual luminance value(s) of at least one sub-pixel. The processor is configured to obtain a display compensation map corresponding to a target sub-pixel according to actual luminance values of the target sub-pixel that are acquired respectively in cases where a plurality of preset display data are input to the target sub-pixel, and target luminance values of the target sub-pixel that are obtained respectively in cases where the plurality of preset display data are input to the target sub-pixel.