Display Stress Compensation via Block Averaging and Dithering
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Solution Overview
Problem
As display devices age, individual pixels may no longer maintain consistent luminance for a given driving current, leading to issues like image sticking, residual images, or ghosting, which can be compensated for by recording the stress history of each pixel but requires substantial memory and processing resources and is prone to cumulative errors.
Innovation Solution
An improved sampling compensation system and method that involves sampling image data, calculating and averaging stress values for blocks of contiguous pixels, ensuring unbiased averages by adding a dither value, and updating the stress profile accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stress history is recorded for each pixel to compensate for luminance degradation, then compensation accuracy is improved, but memory and processing requirements increase substantially
Solution Approach 1:
The patent divides the display panel into multiple blocks, each containing multiple pixels. Instead of tracking stress for every individual pixel, the system calculates average stress values for each block. This segmentation reduces the number of stress values that need to be stored and processed, directly addressing the memory and processing requirements while maintaining adequate compensation accuracy through the averaging process.
Solution Approach 2:
The patent combines stress information from multiple pixels within each block into a single average stress value. By merging the stress data of multiple pixels into one representative value per block, the system significantly reduces the total number of stress profiles that need to be maintained, thereby reducing memory and processing requirements while preserving the essential stress compensation functionality.
2Reliability
If stress data is processed for all pixels to ensure accurate compensation, then compensation reliability is improved, but cumulative errors become prohibitive
Solution Approach 1:
The patent implements a selective sampling approach where only a subset of pixels within each block are used to calculate the average stress value, rather than processing data from all pixels. This partial action reduces the propagation of cumulative errors that would occur if all pixel data were processed, while still providing reliable compensation through the statistical averaging of the sampled pixels.
3Illumination intensity
If individual pixel stress is tracked to maintain luminance consistency, then display quality is improved, but resource consumption increases
Solution Approach 1:
The patent segments the display into blocks and processes stress data at the block level rather than the individual pixel level. This segmentation maintains luminance consistency within each block by compensating based on average stress values, while significantly reducing the processing resources required compared to tracking every individual pixel's stress history.
Data Source
AI summary
A method of compensating for accumulated stress for a display device includes receiving consecutive frames of display data including pixel data, then producing compensated display data from the received display data using a stress profile of accumulated stress of a display panel where the compensated display data includes a plurality of consecutive frames. The method further includes providing the compensated display data to the display panel for display, sampling the compensated display data to produce a plurality of sampled pixel data for a plurality of pixels disposed in a block of spatially contiguous pixels, where the block of spatially contiguous pixels includes a pixel, producing a quantized unbiased average stress value for the pixel using the plurality of sampled pixel data, the producing of the quantized unbiased average stress value including adding a dither value, and updating the stress profile using the produced quantized unbiased average stress value.