Display Device Degradation Compensation Using Feedback Loop
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Solution Overview
Problem
Conventional display devices face challenges in accurately calculating pixel age values due to the lack of reflection of corrected grayscale information in degradation compensation, leading to inconsistent luminance in displayed images.
Innovation Solution
A display device and method that utilize a degradation compensator with lookup tables to generate compensation grayscale values based on accumulated age data, ensuring precise calculation of pixel degradation and uniform luminance by applying compensation data to input image data, with the ability to update and store age values for continuous compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional degradation compensation is used without reflecting corrected grayscale information, then the calculation process is simple, but the luminance uniformity deteriorates
Solution Approach 1:
The patent implements feedback by using the output grayscale value (after gamma correction) as an input for age value calculation in subsequent frames. The degradation compensator calculates age values based on the corrected grayscale information rather than raw input, creating a feedback loop where compensation results from previous frames improve future compensation accuracy, thereby maintaining luminance uniformity
Solution Approach 2:
The patent performs preliminary gamma correction on grayscale values before using them for age calculation. By pre-processing the grayscale information through gamma correction and storing it for future reference, the system prepares corrected data in advance that will be used for more accurate degradation compensation in subsequent frames
2Speed
If age values are calculated using input grayscale values without gamma correction reflection, then the processing speed is fast, but the measurement precision of pixel degradation deteriorates
Solution Approach 1:
The system uses feedback by incorporating the output grayscale value (post-gamma correction) into the age calculation process of subsequent frames. This ensures that the degradation measurement reflects the actual corrected signal being displayed, improving precision without requiring recalculation of previous frames
Solution Approach 2:
Gamma correction is performed preliminarily on the grayscale values before they are used for age calculation. The corrected values are stored and referenced in future frames, so the system doesn't need to reapply gamma correction during age calculation, maintaining processing speed while improving accuracy
Data Source
AI summary
A display device and a method of driving the same. The display device includes a display panel including a plurality of pixels, a degradation compensator configured to output compensation data based on age values of the plurality of pixels and an input grayscale value of input image data, a scan driver configured to supply a scan signal to the display panel, and a data driver configured to supply a data signal corresponding to the compensation data to the display panel. The degradation compensator includes a first compensation unit configured to generate a first compensation grayscale value with reference to the input grayscale value and a first age value, and a second compensation unit configured to generate a second compensation grayscale value with reference to the first compensation grayscale value and the first age value.