Display Device Color Inspection via CIE LAB Conversion
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Solution Overview
Problem
Existing methods face challenges in accurately converting RGB values from display devices into CIE XYZ values, especially when comparing light-emitting and light-receiving types, due to differences in light wavelengths, which complicates calibration and inspection processes.
Innovation Solution
A system and method that includes an image photographing device to capture RGB values from display devices, an inspection control unit to convert these values into CIE XYZ using a color conversion function, and a calibration process to generate this function by comparing RGB and CIE XYZ values from a reference display device, allowing for defect determination in light-emitting display devices like OLEDs and QLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RGB values from display devices are converted into CIE XYZ values using existing methods, then color measurement can be performed, but the conversion accuracy is insufficient due to differences in light wavelengths between light-emitting and light-receiving display devices
Solution Approach 1:
The patent changes the approach from direct RGB to CIE XYZ conversion to a multi-step process involving CIE LAB intermediate values. By transforming the conversion parameters and introducing intermediate color space representations, the system achieves more accurate color measurement across different display device types despite wavelength differences.
Solution Approach 2:
The patent introduces CIE LAB color space as an intermediary between RGB and CIE XYZ conversions. This mediator layer allows for more flexible and accurate color transformation by decoupling the device-specific RGB characteristics from the standard CIE XYZ color space, thereby improving conversion reliability.
2Measurement precision
If separate calibration processes are performed for light-emitting and light-receiving display devices, then accurate color measurement can be achieved, but the inspection process becomes complex and time-consuming
Solution Approach 1:
The patent creates a universal color conversion system that can handle both light-emitting and light-receiving display devices through a unified CIE LAB intermediate approach. This multi-functional method eliminates the need for separate calibration processes for different device types, simplifying the inspection process while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary color space transformations to CIE LAB values during the calibration phase, storing these transformed values for subsequent conversions. This preliminary action prepares the data in advance, reducing the complexity of real-time conversions during actual inspection processes.
3Ease of operation
If traditional color conversion methods are used without intermediate color space transformation, then the conversion process is simple, but the accuracy of color measurement deteriorates due to wavelength differences
Solution Approach 1:
The patent segments the color conversion process into distinct stages: RGB to CIE LAB conversion, then CIE LAB to CIE XYZ conversion. This segmentation allows each transformation to be optimized independently, maintaining procedural clarity while significantly improving measurement accuracy through the intermediate CIE LAB representation.
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
Enables rapid and efficient color measurement and inspection of light-emitting display devices, improving inspection efficiency and simplifying the process by creating a conversion equation using CIE XYZ and RGB values, while allowing for accurate calibration and defect detection.
Implementation Method 1
an image photographing device configured to photograph an image for inspection output from a display device to be inspected and obtain an RGB value for inspection from the photographed image
Implementation Method 2
a color analyzing device configured to photograph an image for calibration of a display device for calibration and measure a spectrum of the photographed image
Data Source
AI summary
Disclosed is a system for analyzing a display device, the system including: an image photographing device configured to photograph an image for inspection output from a display device to be inspected and obtain an RGB value for inspection from the photographed image; and an inspection control unit configured to convert the RGB value for inspection into a CIE XYZ value by using a previously prepared color conversion function, and determine defect of the display device to be inspected by using the converted CIE XYZ value.