Afterimage Compensator Using Grayscale Domain Stress Conversion
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Solution Overview
Problem
Display devices, particularly light emitting display devices, face issues with luminance deviation and afterimages due to pixel or light emitting element deterioration over time, leading to decreased display quality.
Innovation Solution
An afterimage compensator that generates characteristic data for each pixel based on a captured image, accumulates stress data, and converts it into grayscale domain data to produce compensation data, which is used to adjust image data and improve display quality by reflecting deterioration distribution information for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stress accumulation based on voltage domain image signal is performed, then afterimage compensation is achieved, but deterioration distribution information for each pixel is not accurately reflected
Solution Approach 1:
The patent converts the accumulated stress from voltage domain to grayscale domain through a domain converter. This parameter transformation allows the compensation system to work with perceptually relevant grayscale values that directly correlate with human vision, thereby accurately reflecting deterioration distribution while maintaining effective afterimage compensation.
Solution Approach 2:
The patent replaces simple voltage-based stress accumulation with a more sophisticated system that incorporates captured image data, emission area calculations, and grayscale domain conversion. This substitution enables accurate measurement of deterioration distribution by using luminance-weighted emission area information from actual captured images rather than relying solely on voltage signals.
2Measurement precision
If characteristic data generation using captured image is implemented, then deterioration distribution information is accurately reflected, but device complexity increases
Solution Approach 1:
The pixel data generator performs multiple functions: it processes captured image data, calculates emission areas with luminance weighting, generates current density data, and produces characteristic data for each pixel. By consolidating these functions into a single multi-functional module, the patent achieves accurate deterioration measurement without proportionally increasing device complexity.
Solution Approach 2:
The system uses captured image data from the display device itself to generate characteristic data, rather than requiring external calibration equipment or additional sensors. The display device's own imaging capability is leveraged to measure its own deterioration, eliminating the need for separate measurement apparatus and reducing overall system complexity.
3Measurement precision
If emission area calculation with luminance weight is performed, then current density accuracy is improved, but processing time increases
Solution Approach 1:
The pixel data generator pre-calculates and stores emission area data with luminance weighting for each pixel during normal operation. This preliminary computation allows the system to quickly retrieve ready-made characteristic data during compensation cycles, avoiding time-consuming real-time calculations while maintaining high measurement accuracy.
Solution Approach 2:
The patent calculates emission area using luminance weighting from captured images, which provides more accuracy than simple area calculation but requires moderate processing. By using partial luminance information from key regions and applying weighted averages, the system achieves sufficient current density accuracy without performing exhaustive calculations on every pixel at full resolution.
Data Source
AI summary
An afterimage compensator includes: a pixel data generator configured to generate characteristic data for one or more pixels from among a plurality of pixels by using a captured image; a stress accumulator configured to generate an accumulated stress for the one or more pixels in which stress corresponding to the one or more pixels is accumulated based on an image signal of a voltage domain; a domain converter configured to convert the accumulated stress for the one or more pixels from the voltage domain to accumulated stress data for the one or more pixels of a grayscale domain; and a compensator configured to generate compensation data using the characteristic data for the one or more pixels and the accumulated stress data for the one or more pixels.