Display Luminance Compensation From Captured Gray-Scale Images
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Solution Overview
Problem
Existing methods for compensating luminance deviation in display devices suffer from inaccuracies due to errors in converting pixel values to luminance data and gray scale level compensation values, leading to increased processing time and reduced yield, as well as non-uniformity issues that cannot be optimized across different display panels of the same model.
Innovation Solution
A method and device using a luminance deviation compensation unit that applies a linear function with an inclination and offset to convert pixel data to compensation voltages, utilizing a look-up table to accurately compensate for luminance deviations by deriving compensation data from captured images, and applying this data in real-time during image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel values are converted to luminance data using scaling gain and luminance deviations are converted to gray scale level compensation values through multiple conversion processes, then luminance compensation is achieved, but conversion errors occur and manufacturing precision deteriorates
Solution Approach 1:
The patent extracts and eliminates the problematic conversion processes (pixel value to luminance data conversion, luminance deviation to gray scale level conversion) that introduce errors. Instead of using scaling gain and multiple conversion steps, the invention directly generates gray scale level compensation values from captured image data, removing the sources of conversion error and improving manufacturing precision while maintaining measurement accuracy.
2Reliability
If multiple conversion processes are used to compensate luminance deviations, then compensation is achieved, but processing time increases and productivity decreases
Solution Approach 1:
The patent performs preliminary action by directly generating gray scale level compensation values during the image capture process itself, rather than performing multiple sequential conversions afterward. The compensation values are prepared in advance as part of the image processing pipeline, eliminating subsequent conversion steps and significantly reducing processing time while maintaining compensation reliability.
3Adaptability or versatility
If standard luminance conversion methods are used, then general compatibility is maintained, but display uniformity deteriorates across different panels
Solution Approach 1:
The patent applies local quality by generating compensation values specific to each display panel based on its actual captured image data, rather than using a universal conversion method. Each panel receives customized gray scale level compensation values tailored to its specific luminance characteristics, ensuring optimal display uniformity for that particular panel while maintaining method compatibility through the same direct generation approach.
Data Source
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AI summary
The present disclosure relates to a method and a device for compensating for a luminance deviation. A difference in pixel value of the image capturing device between a first pixel and a second pixel in the screen and a difference in gray scale level between first and second gray scale levels are derived from a captured image at the first gray scale level and a captured image at the second gray scale level which include pixel values of the image capturing device. A pixel value for the second pixel is calculated from the captured image at the first gray scale level.