HDMI HDCP Version Selection for HDR to SDR Conversion
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Solution Overview
Problem
Current image signal processing devices fail to effectively convert and display High Dynamic Range (HDR) signals on Standard Dynamic Range (SDR) display devices, limiting the ability to showcase high-luminance content on existing SDRTVs without the need for HDR-compatible TVs.
Innovation Solution
A playback method and device that determine the type of connected display device, select appropriate HDMI and HDCP versions, decode video signals, and perform HDR to SDR or pseudo-HDR conversions to ensure compatible output, allowing HDR content to be displayed on SDRTVs using standard interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HDR video signals are output to SDRTVs using standard HDMI interfaces, then compatibility with existing display devices is improved, but the luminance display quality deteriorates because SDRTVs cannot display high-luminance HDR content
Solution Approach 1:
The patent changes the luminance parameter of the video signal by converting HDR signals to SDR format. The playback device detects the display device type and transforms the high-luminance HDR video signal into standard-dynamic-range SDR signal, adjusting the luminance parameters to match the SDRTV's display capabilities while maintaining compatibility through standard HDMI and HDCP interfaces
Solution Approach 2:
The patent introduces an intermediary conversion process between HDR content and SDRTV display. The playback device acts as a mediator that transforms HDR video signals into SDR format suitable for SDRTVs, enabling HDR content to be viewed on standard display devices without requiring HDR-compatible TVs
2Manufacturing precision
If HDR content is displayed on SDRTVs without conversion, then image quality is preserved, but the display device compatibility deteriorates as SDRTVs cannot properly display HDR signals
Solution Approach 1:
The playback device changes the signal parameters by converting HDR to SDR format, transforming the video signal's luminance characteristics to match the SDRTV's display capabilities while maintaining compatibility through standard HDMI and HDCP interfaces
3Adaptability or versatility
If version selection of HDMI and HDCP is performed according to display device type, then adaptability to different devices is improved, but system complexity increases due to version detection and selection mechanisms
Solution Approach 1:
The playback device performs self-service by automatically detecting the connected display device type and autonomously selecting the appropriate HDMI and HDCP versions. The system self-adapts to the display device capabilities without requiring manual configuration, detecting whether the device is HDR-compatible or SDRTV and automatically adjusting the output format and protocol versions
Data Source
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AI summary
A playback method according to one aspect of the present disclosure is performed by a Blu-ray device connected to a display device. The playback method includes a first obtaining step of obtaining a type of the display device connected to the Blu-ray device; a second obtaining step of obtaining a video signal recorded on a recording medium; and an outputting step of selecting each of a version of HDMI and a version of HDCP according to the obtained type of the display device, and encrypting the obtained video signal using the HDCP of the selected version and outputting the encrypted video signal to the display device using the HDMI of the selected version.