Display Calibration Using Portable Light Sensor Feedback
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Solution Overview
Problem
Electronic devices, such as televisions, often display content with undesired color casts and characteristics due to factory settings, which can be exacerbated by external sources if not properly calibrated.
Innovation Solution
A system comprising multiple electronic devices, where a source device provides visual content to a display device, and a portable device with an ambient light sensor performs calibration operations by measuring light output on test content, allowing for adjustments in white point, contrast, and brightness settings to ensure optimal display attributes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If factory settings are used for display devices, then device complexity is reduced and ease of operation is improved, but display accuracy and color fidelity deteriorate due to undesired color casts
Solution Approach 1:
The system performs preliminary calibration actions by displaying test content with specific color values and having a portable device measure the actual light output. This preliminary measurement phase allows the system to establish calibration data before normal operation, resolving the contradiction by preparing accurate display parameters in advance without affecting the simplicity of subsequent use.
Solution Approach 2:
The calibration system enables the display device to self-calibrate by using its own display capabilities to show test content and its own sensor capabilities to measure output. The portable device assists in measurements, but the overall process allows the display system to automatically adjust its own parameters, maintaining ease of operation while improving display accuracy.
2Adaptability or versatility
If external content sources are connected to display devices, then adaptability and versatility are improved, but display quality deteriorates due to adverse effects from mismatched settings
Solution Approach 1:
The system implements feedback by measuring the actual light output from the display using the portable device's ambient light sensor. The measured values are compared against expected values from test content, and calibration adjustments are made based on this feedback loop. This ensures that content from any external source is displayed with accurate color and brightness regardless of setting mismatches.
Solution Approach 2:
The calibration process changes key display parameters such as brightness, contrast, and color temperature based on measurements taken during test content display. By adjusting these parameters dynamically, the system adapts to different content sources and environmental conditions, maintaining high display quality across diverse usage scenarios.
3Adaptability or versatility
If dynamic adjustment of display settings is implemented, then adaptability to ambient conditions is improved, but device complexity increases
Solution Approach 1:
The portable electronic device serves multiple functions: it acts as a calibration tool for measuring display output, functions as a source of test content, and can serve as an ambient light sensor during normal operation. By consolidating these functions in a single portable device rather than requiring separate dedicated equipment, the system achieves dynamic adaptability without proportionally increasing overall complexity.
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
The system effectively calibrates display devices to maintain desired visual attributes during normal operations, dynamically adjusting color and intensity based on ambient light conditions, thereby improving the viewing experience by minimizing color casts and ensuring content is displayed accurately.
Implementation Method 1
A third electronic device in the system such as a portable electronic device with an ambient light sensor may perform these calibration operations by making measurements on the light output of the display
Data Source
AI summary
A system may include multiple electronic devices. A first device such as a source electronic device may supply visual content for displaying by a display in a second electronic device such as a display electronic device. The display electronic device may be a television or other device with a display. Calibration operations may be performed by taking light measurements on light produced by the display when test content is provided from the first device to the second device. A third electronic device in the system such as a portable electronic device with an ambient light sensor may make measurement on the light from the display while the test content is being displayed. The test content may contain a test image target with time-varying color and time-varying intensity, allowing calibration information such as gamma curves to be obtained on the display.