Display Defect Compensation Circuit Using Spatial-Temporal Dithering
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Solution Overview
Problem
Current video display devices face challenges in compensating display defects, particularly transverse and longitudinal line defects caused by exposure variations and foreign matters, which require large memory storage for compensation data, increasing production costs and memory size.
Innovation Solution
A circuit and method that includes a memory with position and defect level information, a first compensation unit for determining defect levels and selecting compensation data, and a second compensator for spatial and temporal dithering to fine-tune the compensation, reducing memory size by storing compensation data sets based on defect levels rather than each defective region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation data is stored for each regular patterned defective region, then display defect compensation is achieved, but memory size increases
Solution Approach 1:
The patent segments the compensation data storage by dividing defective regions into regular patterned regions and non-regular regions. For regular patterned defective regions, it stores only position information and defect level data without storing complete compensation data sets for each region, thereby reducing memory size while maintaining compensation capability.
Solution Approach 2:
The patent changes the storage parameters from storing complete compensation data sets for each defective region to storing only position information and defect level data for regular patterned regions. This parameter change reduces the data storage requirements while enabling efficient compensation through selective application of compensation algorithms.
2Measurement precision
If multiple compensation data sets are stored for different defect levels, then compensation accuracy is improved, but memory size increases
Solution Approach 1:
The patent performs preliminary classification of defective regions into regular patterned and non-regular categories, and pre-calculates defect levels. This preliminary action enables the system to store only essential information (position and defect level) for regular regions while maintaining multiple compensation data sets only where necessary, reducing overall memory requirements.
Solution Approach 2:
The patent applies partial compensation strategies by storing complete compensation data sets only for non-regular defective regions, while using simplified compensation methods for regular patterned regions. This partial approach maintains sufficient compensation accuracy for critical regions while reducing memory burden.
Data Source
AI summary
Circuit for compensating a display defect in a video display device of the present invention includes a memory having position information on a plurality of regular patterned defective regions of a display panel, gray scale section information, a defect level data on each of the regular patterned defective regions, and a plurality of compensation data on each of the defect level data stored therein, a first compensation unit, upon reception of data to be displayed on the regular patterned defective regions, for determining defect level data on the regular patterned defective regions of the data to be displayed, selecting a compensation data set on the defect level data determined thus, and selecting a compensation data on the data to be displayed from the compensation data selected thus, for compensating the data to be displayed, and a second compensator for distributing the data compensated thus at the first compensation unit spatially and temporally by using dither patterns for making fine compensation, thereby suppressing size increase of the compensation data.