LCD Flicker Reduction via Grayscale Compensation Data Optimization
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Solution Overview
Problem
Liquid Crystal Display (LCD) apparatuses often exhibit noticeable flicker, which is undesirable and requires effective testing methods to minimize this issue.
Innovation Solution
A method and apparatus for testing LCDs by determining minimum and maximum compensation data for various grayscales, setting grayscale compensation data within these ranges, and optimizing flicker characteristics through selective changes based on measured flicker values from test images, using a timing controller and flicker measurement device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grayscale compensation data is adjusted to minimize flicker, then flicker characteristic is improved, but manufacturing complexity increases due to multiple measurement and adjustment steps
Solution Approach 1:
The patent applies preliminary action by pre-determining minimum and maximum compensation data ranges for each grayscale level before actual display operation. This allows the flicker optimization to be performed in advance during manufacturing testing, rather than requiring continuous adjustment during use, thereby reducing the complexity of the operational system while achieving reliable flicker minimization.
Solution Approach 2:
The patent implements feedback by measuring the actual flicker characteristic of the display apparatus and using this measurement to selectively adjust the grayscale compensation data within the predetermined ranges. The measured flicker values are fed back to the timing controller, which automatically adjusts the compensation data to minimize flicker, creating a closed-loop system that achieves optimization without manual intervention.
2Reliability
If multiple grayscale compensation data values are tested to find optimal settings, then flicker minimization is improved, but testing time increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation data adjustment process into discrete grayscale levels (e.g., 256 grayscales). For each grayscale level, minimum and maximum compensation data are predetermined, and adjustments are made independently for each level based on measured flicker values. This segmented approach allows systematic optimization without requiring exhaustive testing of all possible compensation values across all grayscales simultaneously.
Solution Approach 2:
The patent uses partial action by selectively adjusting only those grayscale compensation data values that have been determined to affect flicker, rather than adjusting all compensation data uniformly. The timing controller identifies specific grayscale levels where compensation adjustment is needed and modifies only those parameters, reducing the overall testing and adjustment time while still achieving effective flicker minimization.
Data Source
AI summary
In a method of testing a display apparatus, a plurality of minimum compensation data for a plurality of grayscales, respectively and a plurality of maximum compensation data for the plurality of grayscales, respectively are determined. The display apparatus includes a display panel displaying an image having the plurality of grayscales. A plurality of grayscale compensation data corresponding to the plurality of grayscales, respectively are set based on the plurality of minimum compensation data and the plurality of maximum compensation data. A flicker characteristic with respect to the plurality of grayscales is measured based on the plurality of grayscale compensation data and test images displayed on the display panel. The flicker characteristic is optimized by selectively changing the plurality of grayscale compensation data based on the measured flicker characteristic.