OLED Pixel Degradation Compensation for Luminance Uniformity
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Solution Overview
Problem
Display devices experience luminance deviation and after-images due to pixel and light emitting element degradation, which is not accurately compensated by existing technologies.
Innovation Solution
A display device with a compensator that calculates degradation rates based on the number of first and second light emitting elements, adjusts input gray levels using lookup tables, and compensates image data to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing degradation compensation methods are used, then some luminance deviation is corrected, but accurate compensation for pixels with different numbers of light emitting elements is not achieved
Solution Approach 1:
The pixel is divided into first and second element groups with different numbers of light emitting elements. The compensation method segments the degradation calculation by determining current density separately for each element group based on their respective light emitting element counts, enabling accurate differentiation of degradation rates between groups.
Solution Approach 2:
Different current density values are assigned to the first and second element groups based on their specific light emitting element counts. The compensation parameters are locally optimized for each element group rather than using a uniform approach, allowing precise degradation compensation tailored to each group's characteristics.
2Ease of operation
If uniform compensation is applied to all pixels, then processing is simple, but pixels with different light emitting element counts experience inaccurate compensation
Solution Approach 1:
The compensation system dynamically adjusts current density values based on the actual number of light emitting elements in each element group. Rather than using fixed uniform compensation, the system adapts compensation parameters in real-time according to the specific configuration of each pixel's element groups.
Solution Approach 2:
The method changes the compensation parameters (current density values) according to the light emitting element count in each element group. By modifying these parameters based on element group characteristics, the system achieves accurate compensation without requiring complex processing for each individual pixel variation.
Data Source
AI summary
The display device includes a display panel and a pixel. A compensator configured to calculate a degradation rate of the pixel based on an input gray level of first image data, and compensates the first image data based on the degradation rate to generate second image data. A data driver configured to generate a data signal based on the second image data and configured to supply the data signal to the pixel. The pixel includes a first element group and a second element group connected in series to each other, the first element group includes at least one first light emitting element, and the second element group includes at least one second light emitting element. The compensator is to calculate the degradation rate by applying first information on the number of the first light emitting elements and second information on the number of the second light emitting elements.