Display Signal Processing for HDR Interface Compatibility
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Solution Overview
Problem
Current display technologies face limitations in transmitting high-bit video data required for HDR video displays, as general-purpose interfaces like HDMI, DisplayPort, and DVI are restricted to lower-bit data transmission, insufficient for the higher dynamic range needed in HDR content.
Innovation Solution
A display signal processing system that includes a processing device to generate low-bit video data by decimating gradations, additional data calculation to create complementary data, and a mapping unit to form a transmission signal compatible with standard interfaces, allowing restoration of decimated gradations for accurate HDR display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-bit video data is transmitted to achieve HDR display, then display quality is improved, but interface compatibility deteriorates
Solution Approach 1:
The patent segments high-bit video data into two parts: low-bit video data for transmission through standard interfaces and additional data containing the decimated gradation information. This segmentation allows the system to use existing interfaces while preserving HDR capability through data reconstruction at the display side.
Solution Approach 2:
The patent changes the bit depth parameter of video data from high-bit (e.g., 16-bit) to low-bit (e.g., 8-bit) for transmission, while compensating for the precision loss by adding additional data that contains information about the decimated gradations. This parameter transformation enables interface compatibility without sacrificing display quality.
2Adaptability or versatility
If low-bit video data is transmitted to ensure interface compatibility, then interface adaptability is improved, but video data precision deteriorates
Solution Approach 1:
The additional data acts as an intermediary that carries information about the decimated gradations. This intermediary data enables the display device to reconstruct the original high-bit video data from the low-bit transmitted data, thereby maintaining video precision while ensuring interface compatibility.
Solution Approach 2:
The patent performs preliminary decimation of high-bit video data to low-bit before transmission, and simultaneously generates additional data containing the decimated gradation information. This preliminary action prepares the data in a format suitable for standard interfaces while preserving the information needed for precise HDR display reconstruction.
3Measurement precision
If additional data is added to restore gradations, then video data precision is improved, but data transmission complexity deteriorates
Solution Approach 1:
The patent merges low-bit video data and additional data into a unified transmission signal format that is compatible with standard interfaces. This merging combines the essential video information with the decimation metadata in a single data stream, simplifying transmission while enabling precise reconstruction at the display side.
Data Source
AI summary
A display signal processing system according to the embodiment includes: a processing device configured to generate transmission data; an interface unit configured to transmit the transmission data; and a display unit configured to generate a display signal based on the transmission data. The processing device includes a SDR conversion unit configured to generate low-bit video data by decimating gradations of the video signal; an additional data calculation unit configured to generate additional data on the basis of information of the decimated gradations; and a mapping unit configured to generate the transmission signal including the low-bit video data and the additional data. The display unit includes a processor configured to restore at least a part of the decimated gradations in the low-bit video data on the basis of the transmission signal to thereby generate a display signal.