Extended Dynamic Range Color Boosting for SDR Displays
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Solution Overview
Problem
Conventional digital image and video processing technologies are limited by standard dynamic range (SDR), which restricts the dynamic range and gamut of luminance and color, failing to effectively enhance these aspects on both SDR and HDR displays.
Innovation Solution
A method that adjusts display settings and pixel values to map image content to a nominal color gamut, allowing for a color boosting operation that enhances saturation without altering hue, utilizing an extended range space on the display panel to increase perceived dynamic range and gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional SDR imaging is used, then device compatibility is maintained, but dynamic range and color gamut are limited
Solution Approach 1:
The patent changes the luminance parameter by setting white luminance to a value lower than the native maximum luminance of the display panel. This creates an extended luminance range above the white point, enabling HDR-like display on SDR devices. The color boosting operation then utilizes this extended range to enhance saturation while maintaining compatibility with standard displays.
2Illumination intensity
If white luminance is set to native maximum, then brightness is maximized, but extended luminance range for HDR effect is lost
Solution Approach 1:
The patent shifts from utilizing luminance headroom above white to utilizing it below white. By setting white luminance lower than the native maximum, the patent creates an extended range above the white point that can be used for HDR effects, effectively changing the dimensional approach to luminance utilization.
3Illumination intensity
If color saturation is enhanced, then visual vividness is improved, but color balance and hue may be altered
Solution Approach 1:
The patent applies color boosting selectively to specific color channels (R, G, or B) based on which channel has the minimum value in a pixel. This local quality approach enhances saturation in each pixel while maintaining overall color balance, as each channel is boosted only when appropriate based on the local color composition.
4Use of energy by moving object
If display operates in standard mode, then power consumption is reduced, but perceived dynamic range is limited
Solution Approach 1:
The patent enables the display panel to perform multiple functions: it can operate in standard SDR mode for normal viewing and switch to extended dynamic range mode for HDR content. The same hardware infrastructure supports both modes, allowing the display to provide enhanced dynamic range when needed while maintaining power efficiency for standard content.
Data Source
AI summary
Pixel values of image content are lowered in response to setting a display mode so that the lowered pixel values of the first image content are mapped to a first color gamut. The first color gamut is defined by a nominal range space and is lower than a native color gamut of a display panel. The native color gamut is defined by the nominal range space and an extended range space that is outside of the first color gamut. One or more parameters are obtained for the image content in the display mode. A color boosting operation is performed for, from among the lowered pixel values of the image content in the nominal range space, each of first pixel values that meet one of the parameters. A color associated with each of the first pixel values is proportionally enhanced without changing a corresponding hue to utilize the extended range space.