Display Calibration System Using Ambient Light Sensor
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Solution Overview
Problem
Existing display calibration systems are complex and require multiple devices, leading to tedious calibration processes that often fail to properly adjust all display parameters, resulting in undesired color shifts and intensity fluctuations due to manufacturing variations and aging.
Innovation Solution
A system comprising an electronic device with a color ambient light sensor that generates calibration data by receiving test image light from an external display, allowing for efficient calibration of both internal and external displays to match a target color space, using test signals and images to adjust pixel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional display calibration systems are used, then calibration can be performed, but the system complexity increases and the calibration process becomes tedious
Solution Approach 1:
The patent combines multiple calibration functions into a single portable electronic device. The device integrates a display for showing test patterns, a color sensor for measuring displayed colors, and processing circuitry for generating calibration data. This consolidation eliminates the need for multiple separate devices and specialized equipment, making the calibration system simpler while maintaining accuracy.
Solution Approach 2:
The portable electronic device serves multiple functions: it acts as both the calibration instrument and a universal display device. The same device can calibrate different types of displays (TVs, monitors, projectors) and also function as a regular consumer electronic device. This multi-functionality reduces the need for dedicated calibration equipment.
2Reliability
If traditional display calibration systems are used, then calibration can be performed, but the calibration process becomes tedious and time-consuming
Solution Approach 1:
The device automatically generates and displays a sequence of test patterns without requiring user intervention. The processing circuitry automatically captures images of the displayed patterns, processes the color sensor data, and generates calibration data. This automated preliminary action eliminates manual calibration steps and reduces calibration time.
Solution Approach 2:
The system implements automatic feedback loops where the color sensor continuously measures the displayed test patterns and the processing circuitry adjusts the calibration data generation based on these measurements. This automated feedback mechanism eliminates manual measurement and adjustment steps, significantly reducing the time required for accurate calibration.
3Productivity
If manufacturing variations in light-emitting diodes are present, then displays can be produced, but color shifts and intensity variations occur
Solution Approach 1:
The calibration device enables displays to self-correct their color and intensity variations. By using the display itself to show test patterns and the integrated color sensor to measure the actual output, the system generates calibration data that compensates for manufacturing variations. This self-service approach allows post-manufacturing correction without requiring precision control during the manufacturing process.
4Manufacturing precision
If displays are calibrated to match industry standards, then color accuracy improves, but the calibration process becomes more complex
Solution Approach 1:
The processing circuitry allows users to select different target color spaces (sRGB, Adobe RGB, DCI-P3, Rec. 2020) and automatically adjusts the calibration process parameters accordingly. The system changes its measurement and calculation parameters based on the selected standard, making it easy to calibrate to different industry standards without increasing operational complexity for the user.
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
This approach simplifies the calibration process, reduces the need for specialized equipment, and ensures accurate color and intensity adjustments across all pixels, enhancing display performance and consistency.
Implementation Method 1
The ambient light sensor may generate displayed image measurement data by receiving the emitted image light from the display of the second electronic device
Data Source
AI summary
A display calibration system may include a first electronic device that includes an ambient light sensor and a display to be calibrated in a second electronic device. The first electronic device may generate test patterns to be displayed on the display. The ambient light sensor may receive light emitted from the display based on the test patterns to generate display color space data. The first electronic device may generate calibration data for the display based on the display color space data and a target reference color space. The second electronic device may store the calibration data and use the calibration data to generate more accurate images. Because the first electronic device may include other functionalities other display calibration, specialized display calibration equipment may be omitted. Additionally, a third electronic device that acts as an intermediary between the first and second electronic devices.