OLED Pixel Degradation Detection via Overlapping Block Segmentation
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Solution Overview
Problem
Organic light emitting displays face challenges in effectively detecting pixel degradation, leading to reduced image quality and potential image sticking issues due to the degradation of OLEDs over time, which existing technologies struggle to accurately compensate for.
Innovation Solution
The solution involves dividing the pixel unit into first and second blocks, where accumulation data is generated for each first block and degradation information is detected by adding accumulation data for each second block, with the second blocks overlapping to share pixels with adjacent blocks, allowing for more effective detection of degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel degradation is not detected accurately, then image quality deteriorates and image sticking occurs, but implementing degradation detection increases device complexity
Solution Approach 1:
The pixel array is divided into multiple first blocks, and each first block is further grouped into second blocks for degradation detection. This hierarchical segmentation allows the detection system to process smaller manageable units rather than the entire pixel array at once, reducing computational complexity while maintaining detection accuracy.
Solution Approach 2:
Instead of detecting degradation for every single pixel, the patent applies partial action by selecting representative pixels within each first block and grouping blocks into second blocks. This approach provides sufficient degradation information without the excessive complexity of full-pixel-level detection.
2Measurement precision
If degradation detection is performed at high precision for each pixel, then measurement precision improves, but loss of time increases due to processing large amounts of data
Solution Approach 1:
The patent segments the pixel array into first blocks and second blocks, enabling parallel processing of degradation data. By dividing the large dataset into smaller manageable blocks, the system can process multiple blocks simultaneously or in sequence without overwhelming the processing capacity, thus reducing total processing time while maintaining precision through systematic accumulation and comparison of block-level degradation data.
Solution Approach 2:
The patent uses partial action by selecting representative pixels within first blocks and using accumulation data from multiple periods. This approach achieves sufficient measurement precision for degradation detection without processing every pixel at full resolution, thereby reducing the time required for data processing while maintaining adequate detection accuracy.
3Measurement precision
If accumulation data is generated for each first block and second blocks share first blocks, then detection accuracy improves, but device complexity increases due to overlapping block management
Solution Approach 1:
Adjacent second blocks share common first blocks, merging the detection coverage of multiple blocks. This overlapping structure allows the system to cross-validate degradation information from different block perspectives, improving measurement precision by comparing accumulation data from overlapping regions while managing complexity through systematic block organization.
Solution Approach 2:
The patent implements dynamic block management where second blocks can be shifted in horizontal and vertical directions according to shift control signals. This dynamic configuration allows flexible adjustment of block positions and overlaps to optimize detection accuracy for different display regions while adapting the block management structure to specific detection needs rather than using a fixed rigid configuration.
Data Source
AI summary
An organic light emitting display and a driving method thereof, which can effectively detect degradation information of pixels in a display. An organic light emitting display includes a pixel unit and a degradation detector. The pixel unit has a plurality of pixels positioned at intersection portions of scan lines and data lines. The degradation detector divides the pixel unit into a plurality of first blocks each including a plurality of pixels, and detects degradation information for each second block including a plurality of first blocks. In the degradation detector, the second blocks are divided so that each second block shares one or more first blocks with another second block adjacent thereto.