Display Degradation Compensation Error Correction
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Solution Overview
Problem
Conventional display devices face errors in degradation compensation due to errors in age data stored in Dynamic Random Access Memory (DRAM), leading to erroneous degradation compensation, especially as the resolution increases and age data becomes more extensive.
Innovation Solution
A display device with a degradation compensator that includes a third memory, an error detector, a scaler, an age calculator, and a compensator, which loads and updates degradation values, determines abnormal values, and corrects them using adjacent degradation values and a maximum degradation value, preventing errors in compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If age data is stored in DRAM to handle high resolution display devices, then the display device can manage large amounts of degradation data, but errors may occur in the DRAM interface process leading to erroneous degradation compensation
Solution Approach 1:
The patent applies preliminary action by detecting errors in age data before the degradation compensation process occurs. The error detector identifies abnormal values in the age data stored in DRAM before these values are used for grayscale compensation, preventing erroneous compensation from occurring in the first place
Solution Approach 2:
The patent introduces an intermediary component (error detector) that sits between the DRAM storage and the degradation compensation process. This intermediary detects and flags erroneous age data, allowing the system to handle large amounts of age data while maintaining reliability by filtering out corrupted values before they affect compensation accuracy
2Measurement precision
If degradation values are updated based on accumulated luminance, then compensation accuracy improves, but erroneous updates occur when age data contains errors
Solution Approach 1:
The patent implements feedback by continuously monitoring age data for errors and using this information to control the degradation compensation process. The error detector provides feedback about the quality of age data, and this feedback is used to determine whether to proceed with compensation updates or to use alternative methods (such as neighboring pixel data) to maintain accuracy while preventing erroneous updates
Data Source
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AI summary
A display device includes a display panel, a first memory (150), and a degradation compensator (141). The first memory device stores stress data including degradation values representing a degradation degree of each of the blocks in the display panel. The degradation compensator loads the stress data from the first memory device (AGE_N-1), updates the stress data based on current input data (DATA1) and a maximum degradation value (MAX_AGE), updates the maximum degradation value based on degradation values included in the updated stress data, and generate compensated data (DATA2) by compensating for the current input data based on the updated stress data. The degradation compensator determines whether a first degradation value included in the stress data is normal by comparing the first degradation value with the maximum degradation value, and updates the first degradation value based on at least one adjacent degradation value adjacent to the first degradation value, when the first degradation value is abnormal (220).