Display Panel Brightness Transition for SDR HDR Content
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Solution Overview
Problem
Abrupt transitions between standard dynamic range (SDR) and high dynamic range (HDR) videos cause sudden changes in brightness and color gamut, disrupting the viewer's experience.
Innovation Solution
A method that involves transitioning between SDR and HDR content by adjusting the display panel's brightness incrementally and changing the frame rate, allowing for a smooth transition between different dynamic ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel switches directly from SDR to HDR content, then the dynamic range and brightness capability are improved, but abrupt transitions cause sudden changes in brightness and color gamut that disturb viewers
Solution Approach 1:
The system performs preliminary action by displaying a plurality of transition images before switching to HDR content. These transition images are prepared in advance to gradually adjust the display panel's brightness level from the first brightness level (SDR) to the second brightness level (HDR), preventing abrupt transitions and allowing viewers to adapt naturally to the brightness and color gamut changes.
Solution Approach 2:
The system applies parameter changes by modifying the brightness level parameter incrementally during the transition period. The display panel's brightness level is adjusted from the first brightness level to the second brightness level through a series of intermediate values displayed across multiple transition images, rather than making an abrupt single-step change. This gradual parameter transformation resolves the contradiction between achieving high brightness capability and avoiding disturbing transitions.
2Speed
If the frame rate is increased during the transition period, then the smoothness of transition is improved, but the energy consumption and processing load increase
Solution Approach 1:
The system applies dynamics by making the frame rate adjustable rather than fixed. During the transition period when transition images are displayed, the frame rate is increased to a second frame rate higher than the first frame rate to ensure smooth transitions. After the transition is complete and HDR content is fully displayed, the frame rate is reduced to a third frame rate lower than the second frame rate. This dynamic adjustment of frame rate based on operational phase optimizes the balance between transition smoothness and energy consumption.
Data Source
AI summary
Methods and apparatus for graphics processing, such as producing a smooth transition between images of different dynamic ranges (e.g., Standard Dynamic Range (SDR) images and High Dynamic Range (HDR) images). An example method generally includes using a high frame rate during a transition period to allow properties of images to incrementally vary. The properties may include brightness (i.e., luminance), color gamut, tone mapping, among others. For example, during the transition period, a subset of HDR images are displayed at a second frame rate (e.g., 120 Hz) higher than a frame rate based on the HDR images (e.g., 30 Hz). Simultaneously, a brightness level (as well as other aspects) of the display panel is adjusted incrementally from an SDR brightness level to an HDR brightness level during the transition time period over the subset of the HDR images.