Display Panel Compensation Using Multi-View Color Measurement
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Solution Overview
Problem
Display devices, such as organic light emitting displays, experience irregular color deflection due to light interference, leading to varying image output based on viewing angles.
Innovation Solution
A compensation system that includes a display panel with distinct emission areas, a camera for capturing the panel at multiple viewpoints, and a compensation controller to calculate and generate grayscale compensation data based on color coordinate data, ensuring uniform image output across different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light passes through multiple layers in the display panel, then the display can achieve proper light output, but light interference occurs causing irregular color deflection depending on viewing angle
Solution Approach 1:
The system performs preliminary measurement of color coordinates at multiple viewpoints using a camera before actual display operation. The compensation controller calculates compensation values based on these pre-measured color coordinates and stores them in lookup tables, enabling predictive compensation during normal display operation without requiring real-time complex calculations
Solution Approach 2:
The system uses the camera to measure actual color coordinates at different viewing angles and feeds this information back to the compensation controller. The controller compares measured color coordinates with target values and adjusts grayscale compensation values accordingly, creating a closed-loop feedback system that continuously optimizes color uniformity across the display panel
2Adaptability or versatility
If the display panel is viewed at different angles, then users can view from various positions, but color and grayscale values vary irregularly
Solution Approach 1:
The system divides the display panel into multiple emission areas (first emission area and second emission area) and measures color coordinates separately for each area at multiple viewpoints. This segmentation allows the system to identify and compensate for local variations in color and grayscale across different regions and viewing angles, achieving uniform compensation throughout the entire display panel
Solution Approach 2:
The system changes the grayscale values of pixels dynamically based on viewing angle and position. The compensation controller calculates compensation values by comparing color coordinates at different viewpoints and adjusts grayscale parameters accordingly. This parameter adjustment enables the display to maintain consistent color and grayscale appearance across various viewing angles by modifying the emitted light characteristics
3Manufacturing precision
If grayscale compensation data is generated for multiple viewpoints, then color uniformity is improved, but system complexity increases
Solution Approach 1:
The system performs all complex calculations and generates grayscale compensation data for multiple viewpoints in advance during the measurement and calibration phase. The compensation controller stores these pre-calculated compensation values in lookup tables, transforming the complex real-time computation into simple data retrieval during actual display operation, thus reducing runtime system complexity
Solution Approach 2:
The system creates a digital model (copy) of the display panel's optical characteristics by measuring color coordinates at multiple viewpoints and storing the compensation data in lookup tables. This digital model serves as a reference that the compensation controller uses to adjust grayscale values, replacing the need for complex real-time physical adjustments and simplifying the control system architecture
Data Source
AI summary
A compensation system of a display device according to an embodiment includes a display panel including a first emission area and a second emission area different from the first emission area, each of the first emission area and the second emission area including one or more pixels, a camera configured to capture the display panel at one or more viewpoints, and a compensation controller calculating color coordinate data of the first emission area and the second emission area and generating grayscale compensation data based on the color coordinate data. The grayscale compensation data may be for controlling grayscale values of the one or more pixels included in the second emission area.