Pixel Degradation Compensation Using Stress Data
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Solution Overview
Problem
Existing organic light emitting display devices face inaccuracies in calculating pixel degradation due to variations in driving conditions and pixel characteristics, leading to inconsistent image luminance and inaccurate compensation.
Innovation Solution
A display device with a sensor to measure current through pixels and a compensator that generates stress data to accurately compensate for pixel degradation by dividing pixels into groups, calculating reference values, and interpolating data to match the resolution of sensing data, thereby correcting variations in sensing data based on stress data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel degradation is calculated using sensing data and predetermined reference data, then degradation compensation can be performed, but accuracy decreases due to different driving conditions
Solution Approach 1:
The patent changes the parameters used for degradation calculation from fixed predetermined reference data to dynamic stress data that adapts to actual driving conditions. The compensator calculates stress data based on grayscale values and operating time, then uses this adaptive parameter set to accurately compensate pixel degradation under varying driving conditions.
2Measurement precision
If pixel degradation is calculated relative to a first pixel, then degradation of second pixels can be compensated, but accuracy decreases as distance between pixels increases
Solution Approach 1:
The patent segments the pixel array into multiple groups based on spatial location and characteristics. Each group has its own reference pixel or reference data set, allowing degradation to be calculated locally within each segment. This segmentation maintains accuracy even for pixels far from the original reference pixel by using nearby reference pixels within the same segment.
3Device complexity
If a single reference pixel is used for all pixels, then degradation calculation is simple, but accuracy decreases for pixels far from the reference pixel
Solution Approach 1:
The patent divides the display panel into multiple regions or groups, each with its own reference pixel. This segmentation maintains calculation simplicity within each region while improving accuracy for pixels throughout the panel by using locally-referenced degradation data rather than a single distant reference point.
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 enables precise compensation for pixel degradation, improving the accuracy of image luminance and efficiency in driving the display device by accounting for variations in pixel characteristics and driving conditions.
Implementation Method 1
A sensor 150 measures a current flowing through each of the pixels 111 in response to a reference voltage to generate sensing data
Data Source
AI summary
A display device includes a display panel including pixels; a sensor configured to generate sensing data by measuring a current flowing through each of the pixels based on a reference voltage; and a compensator to generate stress data by calculating stress of the pixels based on input data provided from an external component and to generate degradation data by compensating a variation of the sensing data based on the stress data.