Headroom-Dependent Transfer Function for HDR Display SDR Content
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Solution Overview
Problem
High dynamic range (HDR) displays often exhibit undesired visual artifacts when displaying standard dynamic range (SDR) content, such as loss of content visibility and inconsistency in appearance due to scaling down SDR content to utilize the higher luminance capabilities of HDR displays.
Innovation Solution
The implementation of a headroom-dependent transfer function that adjusts digital pixel values for SDR content to maintain consistent contrast and luminance when displayed on HDR devices, using a scaling factor to create 'headroom' for HDR content while preserving the appearance of SDR content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If SDR content is displayed on HDR display by scaling down to utilize higher luminance capabilities, then the display can achieve higher luminance output, but visual artifacts such as loss of content visibility and inconsistency in appearance occur
Solution Approach 1:
The system dynamically adjusts the transfer function based on the content type (SDR or HDR) and display mode (SDR mode or HDR mode). When SDR content is displayed in HDR mode, the system applies a headroom-dependent transfer function that scales pixel values to preserve contrast and appearance. This dynamic adaptation resolves the contradiction by allowing high luminance output when needed while preventing visual artifacts when displaying SDR content.
Solution Approach 2:
The system changes the transfer function parameters based on operating conditions. A headroom-dependent transfer function is applied when SDR content is displayed in HDR mode, using a scaling factor to adjust pixel values. This parameter change allows the display to maintain SDR-like appearance and contrast while operating at HDR luminance levels, eliminating visual artifacts.
2Adaptability or versatility
If SDR content is displayed in HDR mode with headroom modification, then headroom is created for HDR content display, but the contrast and appearance of SDR content may be degraded
Solution Approach 1:
The system applies a headroom-dependent transfer function with a scaling factor to adjust SDR content pixel values when displayed in HDR mode. This parameter change creates headroom for HDR content while preserving SDR content appearance and contrast through the transfer function's compensation effects.
Solution Approach 2:
The headroom-dependent transfer function acts as an intermediary between the SDR content and the HDR display. It processes the SDR content by applying a scaling factor and transfer function to create headroom for HDR content while maintaining SDR appearance, thus mediating between the conflicting requirements.
3Manufacturing precision
If a headroom-dependent transfer function is applied to SDR content, then contrast and appearance consistency is maintained, but the system complexity increases
Solution Approach 1:
The system uses a headroom-dependent transfer function with a scaling factor to maintain contrast consistency. The transfer function applies different processing based on the headroom available, which is determined by the display mode and content type. This parameter-based approach maintains precision while managing complexity through conditional processing.
Data Source
AI summary
Aspects of the subject technology relate to display circuitry for displaying both standard dynamic range (SDR) and high dynamic range (HDR) content with an HDR display. The subject technology provides a headroom-based transfer function that maintains the contrast of the SDR content whether the display is operated in the SDR or HDR mode.