OLED Display Sub-Pixel Share Control for Color Accuracy
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Solution Overview
Problem
OLED displays with multiple sub-pixels face challenges in achieving accurate color representation, optimizing power consumption, and extending lifetime, particularly in maintaining uniformity and gamma correction across varying gray levels and brightness conditions.
Innovation Solution
A method and system for controlling OLED displays by determining the share of each sub-pixel to produce desired color points and brightness levels, using reference points and share factors to adjust brightness shares based on pixel operation and display performance, and incorporating locally optimized sub-pixels with varying operating conditions for improved efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sub-pixel control methods are used in OLED displays with multiple sub-pixels including white sub-pixels, then the display can achieve basic brightness output, but color accuracy and gamma correction become inaccurate across varying gray levels and brightness conditions
Solution Approach 1:
The patent implements dynamic sub-pixel share factor adjustment based on the desired gray level. Different share factors are applied depending on whether the display is showing light or dark gray levels, allowing the system to adapt its color mixing strategy to maintain accuracy across the full gray level range. This dynamic adaptation resolves the contradiction between maintaining color accuracy and achieving uniformity across varying gray levels.
Solution Approach 2:
The patent changes the operational parameters of sub-pixels by adjusting their share factors - the proportion of brightness contribution from each sub-pixel type. By modifying these parameters based on the desired gray level and using multiple sets of share factors for different gray level ranges, the system maintains accurate color representation and gamma correction across all brightness conditions.
2Illumination intensity
If all sub-pixels operate at high brightness to achieve desired display luminance, then brightness requirements are met, but power consumption increases and lifetime decreases
Solution Approach 1:
The patent applies different share factors to different sub-pixel types based on their individual efficiency characteristics. The white sub-pixel, which has higher luminous efficiency, is assigned higher share factors to contribute more to the overall brightness output. This local optimization allows the display to achieve required brightness levels while minimizing power consumption by leveraging the higher efficiency of white sub-pixels rather than relying equally on all sub-pixel types.
Solution Approach 2:
The system dynamically adjusts the brightness contribution parameters (share factors) of different sub-pixel types to optimize the balance between display brightness and power consumption. By changing these parameters to favor more efficient sub-pixel combinations, the system reduces overall power consumption while maintaining the required illumination intensity.
3Ease of operation
If equal brightness shares are assigned to all sub-pixels, then the control method is simple, but color accuracy and efficiency vary significantly across different gray levels
Solution Approach 1:
The patent segments the gray level range into multiple intervals (e.g., first gray level interval and second gray level interval) and assigns different share factor sets to each interval. This segmentation allows the system to use simplified control within each interval while maintaining overall color accuracy across the full range. The segmentation approach balances control simplicity with color accuracy by avoiding the need for a single complex control scheme.
Solution Approach 2:
Different share factor configurations are applied to different gray level ranges, creating local optimization for each interval. This local quality approach allows the system to maintain simple control within each segment while achieving accurate color representation overall, resolving the contradiction between control simplicity and color accuracy.
Data Source
AI summary
A method and system control an OLED display to achieve desired color points and brightness levels in an array of pixels in which each pixel includes at least three sub-pixels having different colors and at least one white sub-pixel. The method and system select a plurality of reference points in the pixel content domain with known color points and brightness levels. For each set of three sub-pixels of different colors, the method and system determine the share of each sub-pixel to produce the color point and brightness level of each selected reference point, and select the maximum share determined for each sub-pixel as peak brightness needed from that sub-pixel.