Display Color Correction Using CIE1964 X10Y10Z10 Conversion

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Solution Overview

Problem

Large-scale display devices face difficulties in achieving accurate color matching and correction using the CIE1931 color system, as the viewing angle exceeds 4°, requiring the CIE1964 color system's X10Y10Z10 values, which exhibit different visual characteristics, making it challenging to perform perceptual color matching and correction.

Innovation Solution

A correction device that measures XYZ values of the CIE1931 color system, converts them to X10Y10Z10 values of the CIE1964 color system, calculates target values, compares and adjusts correction values to match the target, and performs color correction using the CIE1931 color system, ensuring compatibility with the CIE1964 color system's visual characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If XYZ values of the CIE1931 color system are used for color correction, then compatibility with existing color management standards is maintained, but perceptual color matching accuracy deteriorates for large-scale display devices with viewing angles exceeding 4°

Engineering Contradiction:

Improvecompatibility with color management standardsVSAvoidcolor matching accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent introduces X10Y10Z10 values of the CIE1964 color system as an intermediary between the CIE1931 XYZ values and the actual display characteristics of large-scale devices. The correction device converts XYZ values to X10Y10Z10 values, performs correction calculations in the CIE1964 color space, and then converts back to XYZ values for final correction. This intermediary approach allows the system to maintain compatibility with CIE1931-based standards while achieving accurate color matching for large screens with viewing angles exceeding 4°.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If X10Y10Z10 values of the CIE1964 color system are used for color correction, then color matching accuracy for large-scale display devices is improved, but compatibility with existing color management standards deteriorates

Engineering Contradiction:

Improvecolor matching accuracyVSAvoidcompatibility with color management standards

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent dynamically changes the color space parameters based on the display device characteristics. The correction device detects whether the display device is a large-scale device (with viewing angle exceeding 4°) and automatically switches between using CIE1931 XYZ values and CIE1964 X10Y10Z10 values for correction calculations. This parameter change approach allows the system to achieve high color matching accuracy for large screens while maintaining compatibility with existing standards through selective parameter adaptation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The correction device uses dual color space conversion as an intermediary mechanism. It converts from XYZ values to X10Y10Z10 values for accurate correction calculation, then converts the corrected values back to XYZ values for output. This intermediary conversion process enables the system to utilize the advantages of both color systems: the accuracy of CIE1964 for large screens and the compatibility of CIE1931 with existing standards.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If color correction is performed using CIE1931 XYZ values, then ease of operation with existing correction tools is maintained, but manufacturing precision of color accuracy deteriorates for large screens

Engineering Contradiction:

Improveease of correction operationVSAvoidcolor accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The correction device achieves multi-functionality by supporting both CIE1931 XYZ-based correction and CIE1964 X10Y10Z10-based correction within a single system. It can automatically detect the display device type and select the appropriate correction method, or allow manual selection by users. This universal approach maintains ease of operation with existing correction tools while achieving high color accuracy for large screens, as the system can adapt to different correction requirements without requiring separate correction devices for different screen sizes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9202435B2Correction device for display device and correction method for display device

Publication Date: 2015.12.01 SHARP KK

AI summary

A correction device for a display device includes a detection unit which detects the measured XYZ values of a CIE1931 color system; a first conversion unit which calculates the measured X10Y10Z10 values of a CIE1964 color system based on the measured XYZ values with reference to the characteristics of the display device; a second conversion unit which calculates the target X10Y10Z10 values of the CIE1964 color system based on the target XYZ values representing tristimulus values of a target color in the CIE1931 color system; a correction value calculation unit which compares the measured X10Y10Z10 values with the target X10Y10Z10 values so as to produce a correction value which allows those values to match each other; a correction value calibration unit which rewrites the correction value with a correction value of the CIE1931 color system; and a compensation unit which performs color correction on the display device.