Automatic Display Color Calibration via Optical Sensor
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Solution Overview
Problem
Current color management methods for display devices, especially tablet information terminals without video input/output terminals, are inefficient and require manual intervention, making it difficult to unify color representation across different devices.
Innovation Solution
A method and system that uses a measurement device to transmit display control information to control the display device, allowing for automatic measurement of color representation by intermittently requesting and displaying adjustment images, matching measurement timing with display timing, and generating color space information for precise color management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual color space setting is used, then user can subjectively adjust colors, but measurement precision and color unification are poor due to ambient environment and physical condition variations
Solution Approach 1:
The display device performs self-calibration by automatically displaying test images and having the optical sensor measure them, eliminating the need for manual user adjustment. The device measures its own display characteristics and generates appropriate color correction profiles autonomously.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated optical measurement system. The optical sensor objectively measures display output, and the processor automatically calculates color correction parameters, substituting human subjective judgment with precise optical measurement and computational processing.
2Extent of automation
If ICC profile is used for automatic color space setting, then manual work is reduced, but color unification remains insufficient without adapting to individual display device characteristics
Solution Approach 1:
The patent creates device-specific color correction profiles tailored to each individual display device's characteristics. Instead of using a generic ICC profile for all devices, the system measures and generates customized correction data that accounts for the specific optical properties, panel variations, and aging characteristics of each display unit.
Solution Approach 2:
The system performs preliminary calibration measurements to characterize each display device before actual color-critical work. By pre-measuring display characteristics and generating correction profiles in advance, the system ensures accurate color representation is already optimized before the user begins their workflow.
3Extent of automation
If optical sensor is attached to display device with PC calibration software, then manual work is eliminated, but device complexity increases requiring video input/output terminal or USB terminal connection
Solution Approach 1:
The patent enables display devices without traditional video input/output terminals or USB terminals to perform calibration by utilizing their existing communication capabilities. The system can receive test image data and transmit measurement results through various communication interfaces already present in modern display devices, eliminating the need for specialized calibration terminals.
Solution Approach 2:
The display device performs self-calibration by internally displaying test images and having the attached optical sensor measure them. The processor within the display device processes the measurement data and generates correction profiles, allowing the device to calibrate itself without requiring external PC control through specialized terminals.
4Measurement precision
If multiple adjustment images are manually displayed for measurement, then comprehensive color data is collected, but productivity decreases due to heavy manual workload
Solution Approach 1:
The system automatically sequences through multiple test images for measurement without interruption. The display device continuously displays different adjustment images (such as gray scales, color patches, and luminance levels) in a predetermined sequence, and the optical sensor continuously measures each image, maintaining uninterrupted measurement flow to collect comprehensive color data efficiently.
Solution Approach 2:
The calibration process uses periodic display of standardized test images at specific intervals. The system systematically cycles through a series of predetermined test patterns (gray scales, color charts, luminance steps) in a repeating sequence, ensuring comprehensive color space characterization is achieved through regular, methodical measurement intervals.
Data Source
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AI summary
There are provided a display light measurement method which can measure color representation of a various types of display devices regardless of the specification of the display device; a computer program, and a measurement system. A measurement device (1) connected to an optical sensor (2) can communicate with a target display device (information terminal (3)) to be measured. The measurement device (1) transmits content including a color patch to the display device to cause the display device to display the content and performs a measurement on the displayed content using the optical sensor (2). To perform measurements on many color patches, the measurement device (1) repeats the following: when a measurement on one color patch being displayed is complete, the measurement device 1 transmits content including another color patch to the display device to cause the display device to display the content and performs a measurement on the content being displayed.