HDR Display Brightness Adjustment via User Distance Sensing
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Solution Overview
Problem
Conventional HDR display devices face issues with brightness adjustment, where high brightness can be uncomfortable for users and low brightness fails to clearly display dark regions, necessitating a dynamic solution to optimize image presentation.
Innovation Solution
A display system that includes a sensing module to detect the distance between the user and the HDR display device, updating the image brightness and metadata accordingly to adjust the display settings, specifically managing Maximum Content Light Level (MaxCLL), Maximum Frame Average Light Level (MaxFALL), and Minimum Content Light Level (MinCLL), to ensure optimal image display based on user proximity and ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the HDR display is increased to display bright regions clearly, then the brightness of the image is improved, but the user feels uncomfortable due to excessive brightness
Solution Approach 1:
The patent implements dynamic brightness adjustment by detecting user distance and automatically modifying HDR metadata parameters (MaxCLL, MaxFALL, MinCLL) in real-time. The display scaler continuously adapts brightness levels based on sensed distance, transforming the static HDR display into a dynamic system that responds to user proximity, thereby resolving the contradiction between displaying bright regions clearly and preventing user discomfort.
Solution Approach 2:
The patent changes HDR metadata parameters (MaxCLL, MaxFALL, MinCLL) based on detected user distance. When the user is close to the display, the system reduces MaxCLL and MaxFALL values to lower overall brightness and prevent discomfort. When the user is farther away, the system increases these parameters to ensure bright regions remain clearly visible, thus dynamically adjusting brightness parameters to resolve the contradiction.
2Object-affected harmful factors
If the brightness of the HDR display is decreased to reduce user discomfort, then user comfort is improved, but dark regions in the image cannot be clearly displayed
Solution Approach 1:
The patent selectively adjusts different HDR metadata parameters based on user distance. When reducing brightness to prevent discomfort, the system primarily reduces MaxCLL (maximum content light level) and MaxFALL (maximum frame average light level) while maintaining or adjusting MinCLL (minimum content light level) to preserve dark region visibility. This differential parameter adjustment resolves the contradiction by allowing brightness reduction without sacrificing dark region display quality.
Solution Approach 2:
The patent applies different brightness adjustment strategies to different parts of the image content. By selectively modifying MaxCLL, MaxFALL, and MinCLL parameters, the system maintains appropriate brightness levels for dark regions while reducing overall brightness to prevent user discomfort in bright areas, thus applying local quality adjustment to different luminance ranges within the same image.
3Device complexity
If fixed HDR metadata is used for brightness display, then the display settings are simple, but the brightness cannot be optimized for different viewing distances
Solution Approach 1:
The patent transforms static HDR metadata into a dynamic system that automatically adapts to user distance. The display scaler continuously receives distance information from the sensing module and adjusts HDR metadata parameters in real-time, enabling the system to optimize brightness for different viewing distances without requiring manual user intervention or complex configuration settings.
Solution Approach 2:
The system performs automatic brightness optimization based on detected user distance without requiring manual user input. The display scaler autonomously calculates appropriate HDR metadata parameters (MaxCLL, MaxFALL, MinCLL) based on the sensed distance, enabling the display system to self-adjust and optimize brightness levels adaptively, thus achieving versatility without increasing operational complexity.
Data Source
AI summary
A brightness adjustment method for a display system is disclosed. The display system includes a high dynamic range (HDR) display device, wherein the HDR display device is utilized for displaying an image. The brightness adjustment method includes detecting a distance between the HDR display device and a user, updating a brightness of the image according to the distance, calculating metadata corresponding to the image according to the brightness of the image and determining the image displayed on the HDR display device according to the calculated metadata corresponding to the image.