Display Gamma Correction via On-Pixel Ratio Segmentation
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Solution Overview
Problem
Display devices experience luminance errors due to changes in images, despite using gamma correction values determined during module testing, as the gamma curve can change with different on-pixel ratios and input image data.
Innovation Solution
A display device and method that calculate and select gamma correction values based on on-pixel ratios using test images with varying on-pixel ratios, interpolating between correction values to generate data signals that compensate for differences between target and real luminance, thereby reducing luminance errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single gamma correction value is used during module testing, then the testing process is simple and fast, but luminance errors occur when the on-pixel ratio changes
Solution Approach 1:
The patent segments the gamma correction values into multiple discrete values corresponding to different on-pixel ratios (e.g., 10%, 30%, 50%, 70%, 90%). Instead of using a single gamma correction value for all conditions, the system divides the correction values into specific groups that can be selected based on the actual on-pixel ratio, thereby resolving the luminance accuracy issue while maintaining testing efficiency.
Solution Approach 2:
The patent changes the parameter of gamma correction from a single fixed value to multiple variable values that correspond to different on-pixel ratios. By measuring luminance at different on-pixel ratios and determining appropriate gamma correction values for each condition, the system adapts the gamma correction parameter to match actual display conditions, eliminating luminance errors caused by ratio changes.
2Reliability
If multiple gamma correction values are determined for different on-pixel ratios, then luminance accuracy is improved, but the device complexity and testing time increase
Solution Approach 1:
The patent performs preliminary measurements and corrections during the module testing phase by measuring luminance at different on-pixel ratios and determining appropriate gamma correction values for each condition. This preliminary action establishes a lookup table of correction values that can be quickly selected during normal operation, avoiding the need for complex real-time calculations and reducing operational complexity.
Solution Approach 2:
The patent replaces complex real-time gamma correction calculations with a simpler lookup and selection mechanism. Instead of computing gamma correction values dynamically based on on-pixel ratio, the system uses pre-determined correction values stored in memory, selecting the appropriate value based on the current on-pixel ratio condition, thereby simplifying the correction value management process.
3Manufacturing precision
If gamma correction is performed for every on-pixel ratio, then luminance error is minimized, but the testing process becomes time-consuming
Solution Approach 1:
The patent applies partial correction by selecting gamma correction values for specific, representative on-pixel ratios (e.g., 10%, 30%, 50%, 70%, 90%) rather than attempting to correct for every possible ratio. This partial action approach covers the most common and critical display conditions, achieving sufficient luminance accuracy while significantly reducing testing time compared to exhaustive correction.
Solution Approach 2:
The patent changes the approach from continuous gamma correction for all on-pixel ratios to discrete gamma correction at selected ratio points. By measuring and determining correction values at specific on-pixel ratio intervals, the system achieves effective luminance error reduction for typical display conditions while avoiding the time-consuming process of correcting every possible ratio.
Data Source
AI summary
A display device includes a display panel including a display panel including pixels, a timing controller configured to calculate an on-pixel ratio of input image data provided from an external component, and a data driver configured to select a first gamma correction value from among a plurality of gamma correction values based on the on-pixel ratio, and configured to generate a data signal based on the input image data and the first gamma correction value.