Display Device Deterioration Data Restoration Controller
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Solution Overview
Problem
Display devices face issues with afterimages due to errors in nonvolatile memory, where deterioration data is either under- or over-compensated, leading to abnormal luminance recognition in deteriorated pixels.
Innovation Solution
A display device with a deterioration data controller that compares pixel block deterioration values to adjacent blocks, using a look-up table and sensing data to restore abnormal deterioration data, ensuring accurate luminance compensation through linear interpolation and real-time updating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If deterioration data is stored in nonvolatile memory for stable storage, then data retention is improved, but data accuracy deteriorates due to memory errors
Solution Approach 1:
The patent implements a feedback mechanism where the display device reads back stored deterioration data from nonvolatile memory and verifies its accuracy by comparing with currently calculated deterioration data. When errors are detected (such as initialization to 0 or saturation to maximum value), the system automatically compensates by using the correct deterioration data from memory to adjust grayscale values, thereby maintaining display uniformity and preventing afterimage artifacts.
2Object-generated harmful factors
If grayscale compensation is applied based on stored deterioration data, then afterimage prevention is improved, but image quality deteriorates when deterioration data is abnormal
Solution Approach 1:
The patent applies preliminary action by pre-storing deterioration data in nonvolatile memory before display operation. This allows the system to have deterioration compensation information ready in advance, enabling immediate grayscale adjustment when displaying images, thereby preventing afterimage artifacts from the outset while maintaining image quality through accurate compensation.
3Stability of the object's composition
If deterioration compensation is performed using stored data, then display uniformity is improved, but compensation accuracy deteriorates when data errors occur
Solution Approach 1:
The system implements feedback by continuously monitoring the integrity of stored deterioration data through read-back verification and comparison with currently calculated values. When data errors are detected (such as abnormal values indicating memory initialization or saturation), the feedback mechanism triggers automatic compensation using the verified correct deterioration data, thereby maintaining both display uniformity and compensation accuracy.
Data Source
AI summary
A method for restoring deterioration data of a display device, includes: reading deterioration data from a first storage unit; determining whether the deterioration data is abnormal by comparing a first deterioration value of a first block with adjacent deterioration values of adjacent blocks adjacent to the first block; restoring the deterioration data based on a look-up table in which a luminance retention rate according to a degree of deterioration is set and sensing data provided from a sensing unit, when the deterioration data is determined to be abnormal; and generating second image data by compensating for first image data based on the restored deterioration data. The display device includes blocks each including a pixel, the blocks include the first and adjacent blocks, the deterioration data includes deterioration values each representing a degree of deterioration of each of the blocks, and the deterioration values include the first and adjacent deterioration values.