Display Device Gamma Correction for Ambient Light Color Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, particularly OLEDs, face image quality degradation due to ambient light, leading to color distortion from mixed dark room output light and reflected light, which existing technologies fail to accurately address.
Innovation Solution
A display device and method that incorporates a light sensor to measure ambient light, a controller for gamma curve correction, and specific color coordinate calculations to adjust gamma values based on the deviation between combined light and reference coordinates, ensuring accurate color display even in ambient light environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ambient light measurement and gamma correction are implemented, then color display accuracy is improved, but device complexity increases
Solution Approach 1:
The gamma correction process is segmented into distinct functional units: ambient light measurement by the light sensor, color coordinate calculation for reflected light, dark room output light calculation, combination of these coordinates, and gamma value determination based on deviation from reference coordinates. This segmentation allows each component to perform its specific function independently, improving overall color accuracy while maintaining manageable system complexity through modular design.
Solution Approach 2:
The system performs preliminary calculations of color coordinates for both reflected light and dark room output light before combining them. By pre-calculating these color coordinates and storing them, the system prepares the necessary data in advance, enabling efficient real-time gamma correction without excessive processing complexity during actual display operation.
2Reliability
If gamma correction based on reflected light and dark room output light is applied, then image quality is improved, but calculation complexity increases
Solution Approach 1:
The system pre-calculates and stores color coordinates for both reflected light and dark room output light across different grayscale sections before actual display operation. This preliminary calculation approach separates the complex computational tasks from real-time operation, reducing calculation complexity during actual image rendering while maintaining high image quality through accurate pre-computed color data.
Solution Approach 2:
The calculation process is divided into separate sections: reflected light color coordinate calculation, dark room output light color coordinate calculation for different grayscale sections, and combination of these coordinates. This segmentation allows each calculation to be performed independently with optimized algorithms, reducing overall computational complexity while ensuring accurate image quality through systematic processing.
3Illumination intensity
If luminance adjustment according to ambient light is implemented, then contrast is improved, but color distortion occurs
Solution Approach 1:
The system uses a feedback mechanism where the light sensor continuously measures ambient light conditions, and this information feeds back to adjust the gamma correction parameters. The color coordinates of reflected light are calculated based on measured ambient light, and this feedback loop ensures that luminance adjustment and color accuracy are coordinated, preventing color distortion while maintaining appropriate contrast for the viewing environment.
Solution Approach 2:
The system dynamically changes gamma values based on ambient light conditions by calculating color coordinates and determining deviation from reference coordinates. Instead of fixed luminance adjustment, the system adapts gamma parameters in response to measured ambient light, allowing simultaneous optimization of both luminance/contrast and color accuracy through parameter adaptation rather than simple luminance scaling.
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 solution effectively performs gamma correction to maintain excellent color display quality in ambient light conditions, reducing color distortion and ensuring good image quality by calculating luminance and color coordinates of reflected light.
Implementation Method 1
a light sensor configured to measure ambient light to be converted to an electrical signal
Data Source
AI summary
A display device includes a light sensor, a controller, a data driver, and a scan driver. The controller is configured to correct an input image signal based on an electrical signal output by the light sensor and an input image signal, the controller includes: a first color coordinate calculation unit configured to calculate a color coordinate of reflected light; a second color coordinate calculation unit configured to calculate a color coordinate of dark room output light for at least two grayscale value sections; a combination unit configured to combine the reflected light color coordinate and the dark room output light color coordinate together; and a gamma value setting unit configured to set a gamma value based on a deviation between the combination light color coordinate output by the combination unit and a reference color coordinate.