Tone Mapping Engine for Dynamic SDR HDR Display Control
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Solution Overview
Problem
Electronic devices with displays face challenges in maintaining optimal brightness levels, especially when switching between standard dynamic range (SDR) and high dynamic range (HDR) content, leading to potential damage from prolonged bright content, excessive power consumption, and user preference neglect, along with visible artifacts.
Innovation Solution
Implementing a tone mapping engine in electronic devices that dynamically adjusts tone mapping parameters based on ambient light, user settings, content statistics, display characteristics, point of gaze information, and power source, to ensure appropriate luminance mapping for SDR and HDR content, thereby optimizing display brightness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display brightness is increased to show HDR content, then content quality is improved, but display damage risk and power consumption increase
Solution Approach 1:
The system dynamically adjusts display brightness based on real-time detection of user gaze direction. When the user is looking at HDR content, brightness is increased; when looking at SDR content or elsewhere, brightness is reduced. This temporal dynamics allows the display to operate at high brightness only when necessary, reducing cumulative damage risk while maintaining HDR quality.
Solution Approach 2:
The system applies different brightness levels to different regions of the display based on content type and user attention. HDR content regions receive higher brightness when gazed at, while SDR content regions maintain lower brightness. This spatial differentiation allows localized brightness optimization that improves HDR quality without uniformly increasing overall display brightness and damage risk.
2Illumination intensity
If display brightness is increased to show HDR content, then content quality is improved, but power consumption increases
Solution Approach 1:
The system implements dynamic power management by adjusting display brightness in real-time based on user gaze detection. Brightness is increased only during brief periods when HDR content is being viewed, and reduced during transitions or when SDR content is displayed. This temporal modulation significantly reduces average power consumption compared to sustained high brightness, while still delivering HDR quality when needed.
3Adaptability or versatility
If tone mapping parameters are adjusted dynamically, then brightness adaptation is improved, but device complexity increases
Solution Approach 1:
The system uses gaze-tracking feedback to automatically adjust tone mapping parameters. The gaze tracker provides real-time information about user attention, which feeds back to the tone mapping engine. This closed-loop feedback system enables automatic brightness adaptation without requiring complex manual controls or user intervention, achieving high adaptability through a relatively simple feedback mechanism.
Solution Approach 2:
The tone mapping system serves itself by automatically adjusting parameters based on gaze detection and content analysis. Rather than requiring external control inputs or complex user preferences, the system autonomously determines optimal brightness settings by monitoring user attention and content characteristics, reducing the need for additional control complexity.
Data Source
AI summary
An electronic device may be provided with a display. Standard and high dynamic range content may be produced by content generators operating on control circuitry. Standard dynamic range content and high dynamic range content may be simultaneously displayed. Tone mapping parameters may be produced by a tone mapping engine for use in displaying the standard and high dynamic range content. The tone mapping parameters may be selected based on factors such as ambient light level, user brightness setting, content statistics, display characteristics, point of gaze information, power consumption information, and per-window information. Tone mapping parameters may be selected to accommodate simultaneous display of standard and high dynamic range content. Tone mapping parameters may be temporarily modified in response to a user's point of gaze switching between standard dynamic range content and high dynamic range content.