Preferential Tone Mapping for OLED Display Dynamic Range
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Solution Overview
Problem
Current tone reproduction methods in electronic displays, such as OLEDs, fail to effectively utilize the full dynamic range and provide pleasing images across various viewing environments, often resulting in inadequate contrast and detail, especially in dark colors and shadow regions.
Innovation Solution
The development of a display tonescale system with preferential tone mapping curves that account for different viewing conditions, including viewing flare, display characteristics, and scene luminance, to achieve a natural reproduction of original scenes with enhanced contrast and detail across a wide dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional tone reproduction methods (e.g., sRGB) are used, then the display can reproduce images with a standard dynamic range, but the full dynamic range of modern OLED displays is not effectively utilized, resulting in inadequate contrast and detail in dark colors and shadow regions
Solution Approach 1:
The patent applies parameter changes by introducing viewing condition parameters (illuminance, surrounding illumination, viewing flare) as inputs to the tone mapping function. The system dynamically adjusts the tone mapping curve based on these parameters, allowing the display to optimize contrast and detail across the full dynamic range under different viewing conditions, thereby resolving the contradiction between utilizing full dynamic range and achieving accurate tone reproduction.
2Measurement precision
If a one-to-one luminance mapping relationship is implemented, then the original scene luminances are reproduced accurately, but the viewer does not perceive the image as natural when viewing conditions differ from the original scene conditions
Solution Approach 1:
The patent implements dynamics by making the tone mapping function adaptive to viewing conditions. Instead of using a fixed one-to-one luminance mapping, the system dynamically adjusts the mapping characteristics based on real-time detection of viewing conditions (illuminance, surrounding illumination, viewing flare). This allows the display to maintain natural perception across different viewing environments while still providing accurate luminance reproduction, resolving the contradiction between measurement precision and adaptability.
3Manufacturing precision
If tone enhancement is applied to improve image quality, then contrast and detail in dark regions are enhanced, but the overall natural appearance of the image may be compromised if viewing conditions are not accounted for
Solution Approach 1:
The patent applies feedback by detecting actual viewing conditions (illuminance, surrounding illumination, viewing flare) and using this information to adjust the tone mapping function in real-time. The system continuously monitors viewing conditions and adapts the contrast and detail enhancement accordingly, ensuring that tone enhancement improves image quality without compromising natural appearance. This feedback mechanism resolves the contradiction between contrast enhancement and viewing environment adaptability.
Data Source
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AI summary
A method of displaying on a display a visual reproduction of an original scene with a preferential tone mapping; said display having a selected display white point and a selected display black point separated by more than 3.5 decades of luminance. The method includes capturing original scene parameters, performing a transformation on said captured scene parameters, and displaying a visual reproduction of the scene on the display from the transformed captured scene parameters; wherein said transformation, taken in conjunction with untransformed characteristics of the capturing and displaying steps, results in a reproduced tone mapping having specified parameters.