Dual-Mode Video Transmitter With Selectable Biasing for HDMI and DisplayPort
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Solution Overview
Problem
Current source devices require separate transmitters for HDMI and DisplayPort interfaces, leading to increased cost and size due to the differences in how video and audio signals are transmitted between these standards.
Innovation Solution
A dual HDMI/DisplayPort transmitter that can operate using either the HDMI or DisplayPort interface standard, featuring a single transmission device with selectable impedance networks and a source current generator to adapt biasing current provision based on the mode of operation, allowing it to communicate with both HDMI and DisplayPort sinks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transmitters are used for HDMI and DisplayPort interfaces, then each interface standard can be transmitted reliably according to its specific requirements, but the cost and size of the source device increase
Solution Approach 1:
The patent implements a universal transmitter that can operate in both HDMI and DisplayPort modes through a single device. The transmitter includes mode selection logic and configurable transmission parameters that allow it to adapt to either interface standard, eliminating the need for separate dedicated transmitters for each interface type.
Solution Approach 2:
The transmitter employs dynamic configuration capabilities where transmission parameters such as impedance, voltage levels, and signaling protocols can be adjusted based on the selected mode (HDMI or DisplayPort). This dynamic adaptability allows a single static hardware design to fulfill multiple interface requirements.
2Reliability
If separate transmitters are used for HDMI and DisplayPort interfaces, then each interface standard can be transmitted reliably according to its specific requirements, but the size of the source device increases
Solution Approach 1:
The patent implements a universal transmitter that can operate in both HDMI and DisplayPort modes through a single device. The transmitter includes mode selection logic and configurable transmission parameters that allow it to adapt to either interface standard, eliminating the need for separate dedicated transmitters for each interface type.
Solution Approach 2:
The patent combines the functionality of separate HDMI and DisplayPort transmitters into a single integrated transmitter unit. By merging the transmission capabilities and sharing common components such as voltage regulators, impedance control circuits, and signal processing blocks, the overall device volume is reduced while maintaining support for both interface standards.
3Reliability
If separate transmitters are used for HDMI and DisplayPort interfaces, then each interface standard can be transmitted reliably according to its specific requirements, but the cost of the source device increases
Solution Approach 1:
The patent implements a universal transmitter that can operate in both HDMI and DisplayPort modes through a single device. The transmitter includes mode selection logic and configurable transmission parameters that allow it to adapt to either interface standard, eliminating the need for separate dedicated transmitters for each interface type.
Solution Approach 2:
The patent combines the functionality of separate HDMI and DisplayPort transmitters into a single integrated transmitter unit. By merging the transmission capabilities and sharing common components such as voltage regulators, impedance control circuits, and signal processing blocks, the overall device volume is reduced while maintaining support for both interface standards.
Data Source
AI summary
A method and apparatus is disclosed that is capable of transmitting video signals and/or audio signals using the HDMI interface standard or the DisplayPort interface standard. A dual mode transmitter is disclosed that is configurable to transmit to a first sink device, configured in accordance with a HDMI display interface, in a HDMI mode of operation and/or a second sink device, configured in accordance with a DisplayPort display interface, in a DisplayPort mode of operation. The dual mode transmitter is configured to receive a biasing current from the first sink device in the HDMI mode of operation or to internally provide the biasing current in DisplayPort mode of operation by selecting impedances from selectable impedance networks. The dual mode transmitter is configured to transmit the video signals and/or audio signals by biasing one or more transistors using the biasing current.