Display Panel Color Calibration via Peak-Intensity Ratios
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Solution Overview
Problem
Display apparatuses with the same product number, despite using LCD panels with the same specifications, exhibit significant differences in spectrum due to variations in materials and manufacturing processes, leading to inconsistent color perception across devices, even after color calibration, and require extensive calibration time to adjust gain values for accurate color temperature settings.
Innovation Solution
A color-calibration system and method that utilizes a host, a reference display apparatus, and a display apparatus, measuring spectra in different modes to calculate peak-intensity change rates and ratios, allowing for the determination and adjustment of blue, green, and red gain values to ensure consistent color display across devices at various color temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional color calibration methods are used to adjust gain values of display apparatuses, then color accuracy at a specific color temperature can be improved, but calibration time increases significantly and color consistency across different color temperatures deteriorates
Solution Approach 1:
The patent performs preliminary measurements of peak intensities at blue, green, and red wavelengths across multiple display modes before calibration. By pre-calculating peak-intensity ratios and change rates, the system prepares all necessary data in advance, enabling rapid gain value determination without time-consuming iterative adjustments during actual calibration
Solution Approach 2:
The patent uses a reference display apparatus with known spectral characteristics as a template. By comparing the spectrum of the display apparatus being calibrated against the reference spectrum at multiple wavelengths and modes, the system copies the reference's color characteristics to achieve accurate and consistent color reproduction across different color temperatures
2Measurement precision
If gain values are adjusted for a specific color temperature to achieve accurate color display, then color consistency at that temperature improves, but color display accuracy at other color temperatures deteriorates
Solution Approach 1:
The patent extends color calibration from a single color temperature point to multiple dimensions by measuring spectra at blue, green, and red wavelengths across multiple display modes. This multi-dimensional approach captures the full spectral behavior of the display, enabling accurate color reproduction at various color temperatures simultaneously through comprehensive gain value calculation
Solution Approach 2:
The patent implements a feedback mechanism by measuring the actual spectrum of the display apparatus, comparing it with the reference spectrum, calculating peak-intensity ratios and change rates, and using this feedback information to determine optimal gain values. This closed-loop approach ensures color consistency across different color temperatures by continuously referencing the target spectral characteristics
3Measurement precision
If extensive calibration procedures are performed on multiple display apparatuses to achieve color consistency, then color perception uniformity improves, but manufacturing productivity decreases
Solution Approach 1:
The patent replaces manual or iterative mechanical adjustment procedures with an automated computational system. By using spectral measurements and mathematical calculations (peak-intensity ratios, change rates, and gain value determination) to automatically set color parameters, the system eliminates time-consuming manual adjustments while maintaining high color perception uniformity across multiple display apparatuses
Solution Approach 2:
The patent efficiently determines optimal gain values by calculating peak-intensity ratios and change rates from spectral measurements. By changing the approach from iterative parameter adjustment to direct parameter calculation based on measured spectral characteristics, the system achieves accurate color calibration with minimal calibration time, thereby improving manufacturing productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system efficiently reduces calibration time by calculating and writing optimal gain values for display apparatuses, ensuring consistent color presentation across devices at different color temperatures, thereby addressing the inconsistency in color perception and spectrum differences.
Implementation Method 1
a spectrometer is used to measure a first spectrum and a second spectrum of the first display panel
Data Source
AI summary
A color-calibration system is provided, which includes a host, a reference display apparatus, and a display apparatus. The host calculates peak-intensity change rates relative to different gain values for blue, green, and red colors using a first spectrum and second spectrum of a first display panel of the reference display apparatus respectively in a first display mode and a second display mode. The host calculates peak-intensity ratios for blue, green, and red colors using the first spectrum and a third spectrum of the first display panel in a predetermined color-temperature display mode. The host calculates blue/green/red gains of a second display panel of the display apparatus using a fourth spectrum of the second display panel in the first display mode, the peak-intensity change rates, and peak-intensity ratios, so that the first display panel and the second display panel display a consistent color in the same predetermined color-temperature display mode.