HDR Video Luminance Conversion for OLED Displays
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Solution Overview
Problem
Existing display technologies face challenges in accurately displaying High Dynamic Range (HDR) video signals on HDR TVs due to differences in luminance dynamic ranges between the video content and the display device, leading to issues with color changes and insufficient utilization of display capabilities, especially in organic light-emitting displays (OLEDs).
Innovation Solution
A display method that converts HDR video luminance to match the displayable luminance of the device using a third Electro-Optical Transfer Function (EOTF) that reduces the dynamic range while maintaining the relative luminance relationship, eliminating the need for complex tone mapping processes like knee curve processing, and adjusts based on environment brightness and peak luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional luminance conversion methods are used to display HDR video on HDR TVs, then the display device can show HDR content, but color changes occur and image quality deteriorates due to mismatched luminance dynamic ranges
Solution Approach 1:
The patent applies parameter changes by transforming the luminance dynamic range parameters through EOTF conversion. The system changes the luminance parameter from the HDR video's wide dynamic range to match the display device's specific dynamic range capabilities, while maintaining the relative luminance relationships. This parameter transformation resolves the contradiction by enabling HDR display adaptability while preserving color accuracy through mathematical conversion rather than simple scaling.
Solution Approach 2:
The patent implements dynamics by making the luminance conversion adaptive to the specific display device characteristics. Rather than using a fixed conversion method, the system dynamically adjusts the EOTF conversion parameters based on the display device's peak luminance and dynamic range capabilities. This dynamic adaptation allows the system to optimize color accuracy for each specific device while maintaining HDR display capability.
2Device complexity
If simple luminance scaling is used to convert HDR video luminance, then the conversion process is simple, but the relative luminance relationship is distorted causing image quality loss
Solution Approach 1:
Instead of simple luminance scaling, the patent employs EOTF parameter changes that maintain the relative luminance relationships. The conversion uses electro-optical transfer function parameters to transform the luminance dynamic range while preserving the proportional relationships between different luminance levels. This approach increases conversion complexity slightly but significantly improves luminance relationship accuracy compared to simple scaling.
3Manufacturing precision
If complex tone mapping processes like knee curve processing are used, then luminance conversion accuracy is improved, but the processing complexity and computational load increase significantly
Solution Approach 1:
The patent extracts the essential luminance conversion function from complex tone mapping processes. Rather than implementing full knee curve processing or other complex tone mapping algorithms, the system isolates and applies only the necessary EOTF conversion parameters to achieve accurate luminance transformation. This extraction approach maintains luminance conversion accuracy while significantly reducing processing complexity by eliminating unnecessary computational steps.
4Loss of information
If HDR video with high peak luminance is displayed on devices with lower displayable luminance, then the full dynamic range of the video can be represented, but the display device cannot achieve the intended luminance levels
Solution Approach 1:
The patent resolves this contradiction through EOTF parameter changes that compress the luminance dynamic range while preserving the relative relationships. The conversion parameters are specifically adjusted to map the video's peak luminance information to the display device's maximum displayable luminance, ensuring that the full dynamic range information is retained in the converted signal even though the absolute luminance levels are scaled to match device capabilities.
Data Source
AI summary
Provided is a display method of displaying, on a display device, video of video data where luminance of video is defined by a first EOTF corresponding to HDR. The method includes: acquiring the video data; performing first conversion where the luminance of the video is converted to a luminance corresponding to a dynamic range of a third EOTF, where, with regard to a second EOTF that is part of the first EOTF and is the part of a luminance range where the peak luminance indicated by the peak luminance information included in the acquired video data is maximum luminance, the dynamic range of luminance of the second EOTF is reduced with maximum luminance of the second EOTF matching displayable luminance of the display device, while maintaining the relative relationship of luminance of the second EOTF; and displaying the video on the display device using the result of the first conversion.