HDMI Repeater Graphics Luminance Adjustment
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Solution Overview
Problem
Existing HDMI systems face challenges in accurately superimposing graphics on uncompressed image data with wide luminance dynamic range, leading to potential overexposure when dynamic range conversion is performed without considering the capabilities of display devices with higher luminance capabilities.
Innovation Solution
The implementation of an HDMI repeater that receives dynamic range conversion definition information and adjusts graphics luminance accordingly, allowing for the superimposition of graphics on uncompressed image data with appropriate brightness for display devices capable of higher luminance, using techniques like knee conversion and extension, and transmitting this information through specific packets within the HDMI protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If graphics with standard luminance dynamic range are superimposed on uncompressed image data, then graphics can be displayed on standard monitors, but the dynamic range of graphics displayed on high luminance monitors exceeds the expected range
Solution Approach 1:
The HDMI repeater performs preliminary determination of the display device's luminance dynamic range capability before superimposing graphics. Based on this determination, the repeater adjusts the luminance dynamic range of graphics in advance to match the display device's capability, ensuring accurate display on both standard and high luminance monitors
Solution Approach 2:
The system dynamically adjusts the luminance dynamic range of graphics based on the detected capability of the display device. When a high luminance capability is detected, the repeater increases the graphics luminance dynamic range accordingly, making the graphics adaptation flexible and responsive to different display conditions
2Manufacturing precision
If graphics luminance is adjusted for high luminance displays, then optimal display quality is achieved on advanced devices, but compatibility with standard monitors may be compromised
Solution Approach 1:
The HDMI repeater receives feedback information from the display device regarding its luminance dynamic range capability through the HDMI interface. Based on this feedback, the repeater automatically adjusts the graphics luminance dynamic range to match the display device's capabilities, ensuring optimal display quality while maintaining broad compatibility
Solution Approach 2:
The system changes the luminance dynamic range parameters of graphics based on the display device's detected capability. By adjusting these parameters dynamically, the system achieves accurate luminance representation on high-end displays while automatically adapting to standard monitors, thus resolving the contradiction between precision and versatility
Data Source
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AI summary
Graphics are preferably superimposed on uncompressed image data received from an external device to be transmitted to another external device. An AV amplifier 12 inserted on an HDMI transmission path between a BD player 11 and a television receiver 13 superimposes the graphics on the transmitted uncompressed image data. At that time, the AV amplifier 12 receives dynamic range conversion definition information of the uncompressed image data and generates graphics image data on the basis of the dynamic range conversion definition information to superimpose, thereby displaying the graphics with desired luminance even when dynamic range reverse conversion is performed by the television receiver 13.