Display Device Source-Drain Distance Degradation Compensation
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Solution Overview
Problem
Organic light emitting display devices experience pixel degradation over time, leading to uneven brightness due to varying rates of degradation depending on the distance between the source and drain regions of the driving transistor, which existing technologies fail to adequately compensate for.
Innovation Solution
A display device and method that includes a timing controller to calculate and store data correction coefficients based on the distance between the source and drain regions of the driving transistor, converting image data to compensate for pixel degradation by applying weighted values to reference coefficients, ensuring uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform brightness compensation is applied to all pixels, then overall display uniformity is improved, but pixels with different degradation rates (based on source-drain distance) cannot be adequately compensated
Solution Approach 1:
The patent applies local quality by dividing pixels into different groups based on their source-drain distance characteristics. Each group receives customized correction coefficients that match its specific degradation rate, rather than applying a uniform correction to all pixels. This localized approach ensures that each pixel group's unique degradation characteristics are properly compensated.
Solution Approach 2:
The patent changes the correction parameter (data correction coefficient) based on the source-drain distance characteristic of each pixel group. By varying this parameter according to the specific degradation rate of different pixel groups, the system achieves precise compensation for each group's unique degradation characteristics while maintaining overall display uniformity.
2Device complexity
If pixel degradation is compensated without considering source-drain distance, then compensation process is simplified, but degradation compensation accuracy deteriorates
Solution Approach 1:
The patent segments the pixel array into multiple groups based on source-drain distance characteristics. This segmentation allows the system to apply different correction coefficients to different groups, improving compensation accuracy. The segmentation is performed once during initialization, keeping the overall process manageable while achieving precise group-specific compensation.
Solution Approach 2:
The patent performs preliminary classification of pixels into groups based on source-drain distance during the initialization phase. This preliminary action enables the system to pre-calculate and store appropriate correction coefficients for each group, so that during normal operation, the compensation process is efficient and accurate without requiring complex real-time analysis of each pixel's characteristics.
3Measurement precision
If data correction coefficients are calculated for each individual pixel, then compensation precision is improved, but calculation time and processing load increase
Solution Approach 1:
The patent applies partial action by calculating correction coefficients for each pixel group rather than for every individual pixel. This approach achieves sufficient compensation precision by treating pixels with similar source-drain distance characteristics as a group, reducing the total number of calculations required while maintaining effective degradation compensation for each pixel within the group.
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 effectively compensates for pixel degradation on a pixel-by-pixel basis, maintaining uniform brightness by accounting for the distance-dependent degradation rates, thereby improving the overall display performance.
Implementation Method 1
the organic light emitting display device displays images using an organic light emitting diode that generates light by recombination of electrons and holes
Data Source
AI summary
A display device includes: a plurality of pixels each of which includes a light emitting element and a driving transistor having a source region separated from a drain region by a first distance to control an amount of current flowing through the light emitting element; a timing controller to convert a first image data input into a second image data, using a data correction coefficient set corresponding to the first distance of one of the plurality of pixels; and a data driver to generate a data signal corresponding to the second image data and supplying the data signal to the one of the plurality of pixels. A method of compensating for degradation of a display device also is disclosed.