HDMI Signal Line Switching for High-Speed Data Transmission
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Solution Overview
Problem
Current HDMI standards limit data transmission to 100 Mbps due to bottlenecks in the HDMI Ethernet Channel, restricting high-speed data communication over wired connections.
Innovation Solution
An electronic apparatus with a switching unit that selectively connects I2C communication or high-speed differential communication modes using the same two signal lines, allowing for bidirectional differential communication without increasing the number of signal lines, enabling higher data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HEC (HDMI Ethernet Channel) is used for data transmission, then wired connection is established, but the data transmission speed is limited to 100 Mbps due to bottleneck
Solution Approach 1:
The patent makes the two signal lines serve multiple functions: they are used as I2C communication lines for device identification and capability exchange, and as high-speed data communication lines for Gigabit Ethernet transmission. This multi-functionality allows the system to achieve high-speed data transmission without adding dedicated high-speed signal lines, thereby resolving the contradiction between wired connection reliability and data transmission speed.
Solution Approach 2:
The patent changes the communication mode parameter by switching from I2C bidirectional communication to bidirectional differential communication. This parameter change enables the signal lines to transmit data at Gigabit Ethernet speeds (1000 Mbps or higher) instead of being limited to 100 Mbps, while maintaining the same physical connection infrastructure.
2Speed
If high-speed data communication is implemented using existing two signal lines, then data transmission rate increases, but communication mode complexity increases due to switching requirements
Solution Approach 1:
The patent introduces a switching unit that dynamically changes the connection state between communication units and signal lines based on the required communication mode. The switching unit can connect the first communication unit (I2C) or the second communication unit (high-speed differential) to the two signal lines as needed. This dynamic switching capability allows the system to adapt between different communication modes, resolving the contradiction between high-speed data transmission and device complexity by providing a flexible, controllable solution.
3Loss of information
If I2C communication is used for device identification, then capability exchange is achieved, but data transmission speed remains limited
Solution Approach 1:
The patent segments the communication functions into two distinct communication units: the first communication unit handles I2C bidirectional communication for device identification and capability exchange, while the second communication unit handles high-speed bidirectional differential communication for data transmission. This segmentation allows each communication unit to be optimized for its specific function, resolving the contradiction between reliable capability information exchange and high-speed data transmission.
Data Source
AI summary
An electronic apparatus includes a first communication unit configured to perform I2C bidirectional communication with an external apparatus using two signal lines included in a transmission path as I2C communication lines, a second communication unit configured to perform bidirectional differential communication with the external apparatus using the two signal lines as high-speed data communication lines, a switching unit configured to select a first communication state in which the first communication unit is connected to the two signal lines or a second communication state in which the second communication unit is connected to the two signal lines, and a controller configured to control operation of the switching unit.