Color Gamut Control Device for Ambient Light Compensation
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, face challenges in maintaining image visibility and color accuracy due to variations in ambient luminance, which can affect the perceived color gamut and overall image quality.
Innovation Solution
A color gamut controlling device that includes a light sensing unit to measure external luminance, calculation units to adjust and calculate tristimulus values for primary colors, and a color gamut calculation unit to determine a corrected color gamut, ensuring optimal image display across different ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display device operates without color gamut control, then the device complexity is reduced, but the color accuracy and image visibility deteriorate under varying ambient luminance conditions
Solution Approach 1:
The system pre-calculates and stores correction values for different luminance conditions. When ambient light changes, the controller selects the appropriate pre-computed correction values rather than performing real-time calculations, thereby maintaining color accuracy while minimizing processing complexity and power consumption.
Solution Approach 2:
The patent adjusts the color gamut by changing the tristimulus values (X, Y, Z) based on measured ambient luminance levels. The controller dynamically modifies display parameters including brightness, contrast, and color temperature to compensate for ambient light variations, ensuring consistent color accuracy across different viewing conditions.
2Manufacturing precision
If the color gamut is adjusted frequently to maintain color accuracy, then the color accuracy improves, but the power consumption increases
Solution Approach 1:
The light sensing unit measures ambient luminance at periodic intervals rather than continuously. The controller updates color gamut corrections only when luminance changes exceed a threshold, reducing unnecessary processing and power consumption while maintaining adequate color accuracy for varying ambient conditions.
Solution Approach 2:
Correction values for different luminance levels are pre-calculated and stored in memory. When ambient light changes, the system retrieves and applies the appropriate pre-computed correction values, avoiding the need for continuous real-time calculations and reducing power consumption while maintaining color accuracy.
3Reliability
If the display device compensates for ambient luminance changes, then the image visibility improves, but the device complexity increases
Solution Approach 1:
The color gamut control function is segmented into independent modules: a light sensing unit for measuring ambient luminance, a controller for calculating correction values, and a display unit for applying corrections. This modular architecture improves image visibility while managing device complexity through functional separation and independent optimization of each component.
Solution Approach 2:
The system implements a feedback loop where the light sensing unit continuously monitors ambient luminance, the controller compares current conditions with reference values, and adjusts the color gamut accordingly. This closed-loop feedback mechanism ensures reliable image visibility under varying ambient conditions while maintaining manageable device complexity through automated control.
Data Source
AI summary
A color gamut controlling device and a display device including the color gamut controlling device. The color gamut controlling device includes a light sensing unit, a first calculation unit, a second calculation unit, and a color gamut calculation unit. The light sensing unit measures a luminance of external light. The first calculation unit calculates adjusted tristimulus values for each of three primary colors based on the measured luminance. The second calculation unit calculates final tristimulus values for each of the three primary colors using the adjusted tristimulus values and target tristimulus values for each of the three primary colors. The color gamut calculation unit calculates a corrected color gamut from the final tristimulus values. The light sensing unit may further measure tristimulus values of the external light for each of the three primary colors.