Display Panel Luminance Calibration via Multi-Grayscale Segmentation
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Solution Overview
Problem
Display panels face challenges in achieving uniform luminance due to luminance differences across various positions, which can exceed the dynamic range of cameras used for calibration, leading to inaccurate imaging of luminance variations.
Innovation Solution
A method for calibrating the luminance of a display panel involves generating panel luminance videos at different grayscale levels, calculating calibration values based on these videos, and iteratively applying these values to achieve uniform luminance while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single grayscale calibration is performed, then the calibration process is simple and fast, but the luminance uniformity across different brightness levels is inaccurate
Solution Approach 1:
The calibration process is segmented into multiple grayscale levels (first grayscale and second grayscale) instead of using a single calibration point. This allows the system to capture luminance characteristics across different brightness ranges, improving overall calibration accuracy while managing complexity through structured multi-stage processing
Solution Approach 2:
A first calibration is performed preliminarily at an initial grayscale level before conducting the second calibration at a different grayscale level. This preliminary calibration establishes a baseline that guides subsequent calibration steps, ensuring progressive refinement of luminance uniformity across varying brightness conditions
2Illumination intensity
If the luminance difference between dark and bright areas exceeds camera dynamic range, then the full luminance spectrum is captured, but the panel luminance video cannot appropriately image luminance differences
Solution Approach 1:
The luminance measurement process is segmented into multiple grayscale levels that divide the overall luminance range into manageable segments. By calibrating at different grayscale levels (e.g., dark and bright conditions separately), the system ensures that luminance differences within each segment remain within the camera's dynamic range while collectively covering the full luminance spectrum
Solution Approach 2:
The calibration process changes the grayscale parameter to different levels (first grayscale and second grayscale) to adapt the measurement conditions. This parameter variation ensures that luminance differences at each level are captured within the camera's dynamic range, preventing saturation and maintaining measurement precision across the entire luminance spectrum
3Manufacturing precision
If iterative calibration at multiple grayscales is performed, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The first calibration at the first grayscale level serves as a preliminary action that addresses major luminance non-uniformities before the second calibration at the second grayscale level. This progressive approach achieves high luminance uniformity through targeted calibration steps rather than exhaustive continuous calibration, thereby reducing overall power consumption while maintaining precision
Data Source
AI summary
The present disclosure relates to a method of calibrating luminance of a display panel and can accurately derive a calibration value for luminance of the display panel through a first luminance calibration step of calibrating the display panel using a first calibration value derived after the display panel is driven with a first grayscale value and a second luminance calibration step of calibrating the display panel using a second calibration value derived after the display panel calibrated using the first calibration value is driven with a second grayscale value.