Display Device Grayscale Remapping for Leakage Current Compensation
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Solution Overview
Problem
Display devices experience degradation in image quality and color accuracy, particularly in low grayscale ranges due to leakage current in pixels, leading to distorted gamma characteristics and white balance issues.
Innovation Solution
A display device and method that remap grayscale values from a first grayscale range to a second range and compensate for these values based on adjacent pixel values, using a data converter and data driver to generate data signals that adjust the luminance of pixels, thereby mitigating the effects of leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grayscale values are directly applied to pixels, then the display structure remains simple, but gamma characteristics degrade and white balance becomes distorted in low grayscale ranges due to leakage current
Solution Approach 1:
The patent applies preliminary action by performing grayscale remapping and compensation before the grayscale values are applied to the pixels. The data converter remaps input grayscale values from a first range to a second range and compensates based on adjacent pixel values, preventing leakage current effects before they occur. This advance processing ensures accurate gamma characteristics and white balance without requiring complex hardware modifications.
Solution Approach 2:
The patent introduces an intermediary component - the data converter - that sits between the input grayscale values and the pixel array. This intermediary performs remapping and compensation operations, mediating the effect of leakage current on the display. The data converter calculates compensated grayscale values by considering both the target pixel value and adjacent pixel values, effectively isolating the pixel array from the harmful effects of leakage current.
2Use of energy by moving object
If grayscale values in low range are used, then power consumption is reduced, but leakage current causes deterioration of display quality and color accuracy
Solution Approach 1:
The patent applies parameter changes by transforming the grayscale value parameters through remapping from a first grayscale range to a second grayscale range. The data converter modifies the parameter values to compensate for leakage current effects, adjusting the relationship between input grayscale values and actual pixel luminance. This parameter transformation maintains display quality at low power consumption levels by accounting for the non-linear effects of leakage current.
Solution Approach 2:
The patent implements feedback by using adjacent pixel grayscale values to compensate for the target pixel value. The data converter calculates the compensated grayscale value by considering the relationship between neighboring pixels, effectively using spatial feedback to counteract leakage current effects. This feedback mechanism ensures that low grayscale values maintain their intended luminance and color characteristics despite the presence of leakage current.
3Reliability
If compensation based on adjacent pixels is applied, then white balance distortion is corrected, but processing time and computational load increase
Solution Approach 1:
The patent applies segmentation by dividing the grayscale compensation process into distinct stages: remapping the input grayscale values from the first range to the second range, and then compensating based on adjacent pixel values. This segmented approach allows each processing stage to be optimized independently, managing computational complexity while achieving accurate white balance correction.
Data Source
AI summary
A display device includes a display unit including a plurality of pixels, a data converter to receive grayscale values respectively corresponding to the plurality of pixels, generate first compensated grayscale values by remapping the grayscale values of a first grayscale range to the first compensated grayscale value of a second grayscale range, and generate second compensated grayscale values by compensating for the first compensated grayscale values based on first compensated grayscale values of adjacent pixels, and a data driver to generate data signals based on the second compensated grayscale values and provide the data signals to the plurality of pixels of display unit, wherein adjacent pixels of a target pixel correspond to pixels adjacent to the target pixel, and wherein at least one of the adjacent pixels emits light having a color different from that of the target pixel.