Display Apparatus OSD Luminance Control for HDR Power Efficiency
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Solution Overview
Problem
Display apparatuses with wider dynamic range, such as HDR, experience increased power consumption and luminance degradation due to high peak luminance and fixed OSD input gradation, which affects visibility and power efficiency.
Innovation Solution
A display apparatus with a switching unit, generating unit, and control unit that allows switching between SDR and HDR modes, with controlled luminance of the black region in HDR mode reduced to match or be less than in SDR mode to manage power consumption and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If HDR mode is used to display images with wider dynamic range, then the display quality and luminance range are improved, but power consumption increases due to high peak luminance
Solution Approach 1:
The patent applies local quality by setting different luminance levels for different regions of the OSD. Specifically, the character image region maintains high luminance for visibility, while the black band image region uses low luminance to reduce power consumption. This regional differentiation allows the system to enjoy HDR's wide luminance range capability without uniformly high power consumption across the entire OSD.
Solution Approach 2:
The patent changes the luminance parameter dynamically based on the display mode. When switching between SDR and HDR modes, the system adjusts the luminance of the black band image accordingly. In HDR mode, the black band luminance is specifically controlled to be lower than in SDR mode, while the character image luminance is maintained at appropriate levels for visibility. This parameter adjustment resolves the contradiction between wide luminance range and power consumption.
2Illumination intensity
If fixed high input gradation is used for OSD in HDR mode, then the luminance can be maintained, but visibility deteriorates due to too much glare with extension of peak luminance
Solution Approach 1:
The patent applies local quality by differentiating the luminance characteristics between the black band region and the character image region. The black band uses low luminance to provide a dark background that enhances character visibility, while the character image region maintains appropriate luminance for clear text display. This prevents the glare issue that would occur with uniformly high luminance across the entire OSD in HDR mode.
Solution Approach 2:
The patent introduces dynamic adjustment of OSD luminance parameters based on the display mode. Rather than using fixed high input gradation, the system dynamically sets the black band luminance to be lower in HDR mode compared to SDR mode, while adjusting character image luminance to maintain visibility. This dynamic approach prevents excessive glare while preserving readability.
3Illumination intensity
If high luminance is used for black band image in HDR mode, then the display brightness is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by assigning different luminance levels to different functional regions of the OSD. The black band image region, which serves as a background element, uses low luminance to minimize power consumption. The character image region, which requires visibility, maintains appropriate luminance levels. This regional differentiation allows the system to achieve good overall brightness where needed without the power consumption penalty of uniformly high luminance.
Solution Approach 2:
The patent changes the luminance parameter of the black band image based on the display mode. In HDR mode, the black band luminance is specifically controlled to be lower than in SDR mode. This parameter adjustment directly addresses the contradiction by reducing power consumption in the black band region while maintaining the system's ability to display high luminance content in the main image area and character region when needed.
4Use of energy by moving object
If luminance of character image is lowered to reduce power consumption, then energy efficiency is improved, but visibility of OSD deteriorates
Solution Approach 1:
The patent applies local quality by ensuring that the character image region maintains appropriate luminance levels independent of the black band luminance. While the black band uses low luminance to reduce power consumption, the character images are rendered with sufficient brightness and contrast against the dark background to ensure readability. This localized optimization allows power savings in the black band region without compromising character visibility.
Data Source
AI summary
A display apparatus switches to any one of a plurality of modes, generates a partial image, and controls a luminance of a black region. The plurality of modes includes a first mode capable of displaying an image of a first dynamic range on a display unit and a second mode capable of displaying an image of a second dynamic range wider than the first dynamic range on a display unit. The partial image includes at least a black region and is superimposed on an image displayed on the display unit. Controlling includes controlling a luminance of the black region of the partial image in the second mode to be less than a luminance of the black region of the partial image in the first mode.