Display Mura Compensation Using Local Parameter Selection
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Solution Overview
Problem
Display panels suffer from non-uniformity issues during manufacturing, leading to visually noticeable bright spots or stains (mura) at specific pixels or areas.
Innovation Solution
A mura compensation apparatus calculates compensation parameters using test and captured image data to determine local compensation parameters with the greatest variation, minimizing register usage in the display driving apparatus by accurately compensating for mura through a mura compensation formula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mura compensation is performed using traditional methods, then display uniformity is improved, but register usage increases causing higher device complexity
Solution Approach 1:
The patent applies local quality by identifying and compensating for mura defects locally in specific regions of the display panel rather than applying uniform compensation across the entire panel. The system determines local compensation parameters for only those regions exhibiting mura defects, thereby reducing the overall register usage while maintaining display uniformity in affected areas.
Solution Approach 2:
The patent extracts only the essential compensation parameters needed for mura correction, separating the compensation process from other display control functions. By extracting and storing only the necessary local compensation parameter data rather than all possible parameters, the system reduces register requirements while maintaining effective mura compensation capability.
2Measurement precision
If comprehensive mura compensation parameters are calculated for all unit blocks, then compensation accuracy is improved, but calculation time increases
Solution Approach 1:
The patent segments the display panel into multiple unit blocks and processes each segment independently to determine local compensation parameters. This segmentation allows the system to calculate compensation parameters only for regions with mura defects rather than processing the entire panel uniformly, thereby reducing total calculation time while maintaining accuracy in affected areas.
Solution Approach 2:
The patent applies partial action by calculating and storing compensation parameters only for unit blocks that exhibit mura defects rather than comprehensively processing all unit blocks. This selective approach reduces calculation workload and time while maintaining sufficient compensation accuracy for the affected regions.
Data Source
AI summary
A mura compensation apparatus includes a compensation parameter calculation unit; a compensation parameter range calculation unit; a local compensation parameter determination unit that determines, as a local compensation parameter, a compensation parameter having the largest compensation parameter range from among first to third compensation parameters, and calculates compensation parameter range data of the compensation parameter determined as the local compensation parameter; and a mura compensation data output unit for outputting mura compensation data by using first to third compensation parameter data and first to third compensation parameter range data for the first to third compensation parameters, and local compensation parameter data and local compensation parameter range data for the local compensation parameter.