Factory Calibration Data Reuse for Consistent Display Color
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Solution Overview
Problem
Display devices exhibit inconsistent color reproduction due to varying panel characteristics, and while user calibration is possible with inexpensive colorimeters, they lack precision, and factory calibration data is often erased, necessitating a method to utilize precise factory calibration data for consistent color output.
Innovation Solution
Storing factory calibration measurement data on memory or cloud services and using it to generate color profiles without external instruments, allowing recalibration based on precise factory data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration measurement data is stored and reused, then color accuracy and consistency are improved, but device complexity and data management requirements increase
Solution Approach 1:
The system performs factory calibration measurements and stores the resulting lookup tables (LUTs) and color profiles in advance before the display device reaches the end user. This preliminary action eliminates the need for complex calibration procedures during user setup, as the precise factory calibration data is already prepared and stored in non-volatile memory, thereby improving color accuracy while avoiding the complexity of runtime calibration systems
Solution Approach 2:
The patent creates a copy of the factory calibration data (lookup tables and color profiles) and stores it in the display device's memory. This copying approach allows the system to reuse the precise factory calibration measurements without requiring the original calibration equipment or measurements to be available during user calibration, thus maintaining high color accuracy while simplifying the overall system architecture
2Ease of operation
If user calibration with inexpensive colorimeters is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The system uses an intermediary approach by storing the factory calibration data (lookup tables and color profiles) in the display device's memory as a reference standard. When users perform calibration with inexpensive colorimeters, the system compares the user measurements against the stored factory calibration data, allowing the low-cost device to achieve accuracy comparable to expensive factory equipment without compromising ease of operation
Solution Approach 2:
The display device performs self-calibration by utilizing the factory calibration data that is automatically stored in its memory during manufacturing. This self-service capability allows the device to maintain accurate color reproduction without requiring users to purchase or operate expensive calibration instruments, thereby improving ease of operation while preserving measurement precision through the pre-stored reference data
3Ease of manufacture
If factory calibration data is erased during validation, then manufacturing process simplicity is improved, but loss of information occurs
Solution Approach 1:
The system performs factory calibration measurements and stores the resulting lookup tables (LUTs) and color profiles in non-volatile memory during the manufacturing process. This preliminary action ensures that the calibration data is preserved and available for use by the end user, eliminating the need to erase the data while maintaining manufacturing simplicity through automated calibration procedures
Solution Approach 2:
The patent implements a system where factory calibration data is generated and stored in non-volatile memory during manufacturing, then made available to the end user for recalibration purposes. This approach recovers and preserves the valuable calibration information that would otherwise be lost when factory calibration is performed, allowing the data to be reused without requiring erasure while maintaining ease of manufacture through automated processes
Data Source
AI summary
An example display system includes a load engine and a calibration engine. The load engine causes an inquiry for current calibration measurement data and retrieves factory calibration measurement data when the current calibration measurement data is unavailable. The calibration engine receives a target set of display characteristics, generates a color profile from a native panel performance representation to operate a display according to the target set of display characteristics, and causes adjustment of a display according to a difference between the target set of display characteristics and the native panel performance representation using the generated color profile.