HDMI DDC Switch Unit for Debugging and Control
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Solution Overview
Problem
Current HDMI systems require additional circuit channels for debugging, code upgrades, and pre-shipment tests, leading to inconvenient operations and increased system costs due to the limited functionality of the Display Data Channel (DDC) in transmitting control commands.
Innovation Solution
A system and method for signal input control using a High Definition Multimedia Interface (HDMI) that includes a control device and a video device with a switch unit, EDID ROM, processor, and detection circuit, where the detection circuit controls the switch unit's connection mode based on specific voltage inputs through the DDC, allowing process information to be transmitted either to the EDID ROM or the processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional circuit channels are designed for debugging and control commands, then system functionality is improved, but device complexity and system cost increase
Solution Approach 1:
The DDC channel, originally designed only for EDID transmission, is enhanced to perform multiple functions including debugging, code upgrades, maintenance operations, and pre-shipment tests. The switch unit enables the DDC channel to dynamically route process information to either the EDID ROM or processor based on control commands, making a single channel serve multiple purposes without adding extra circuit channels.
Solution Approach 2:
The patent combines the debugging and control command transmission functions with the existing DDC channel structure. By merging these additional functionalities into the existing EDID transmission pathway through the switch unit, the system avoids the need for separate dedicated channels, thereby reducing overall device complexity while maintaining enhanced functionality.
2Adaptability or versatility
If additional circuit channels are designed for debugging and control commands, then system functionality is improved, but system cost increases
Solution Approach 1:
The DDC channel is designed to serve multiple functions including its original EDID transmission role plus debugging, code upgrades, maintenance, and testing capabilities. This multi-functionality eliminates the need for additional dedicated circuit channels, thereby reducing component count and system cost while maintaining comprehensive functionality.
Solution Approach 2:
The patent merges debugging and control functions into the existing DDC infrastructure. By combining these functions through the switch unit rather than creating separate channels, the system reduces manufacturing complexity and material costs while achieving the required system capabilities.
3Device complexity
If the DDC channel is used for both EDID transmission and control commands, then device complexity is reduced, but signal transmission reliability may be affected
Solution Approach 1:
The switch unit provides dynamic routing capability that adapts the DDC channel's function based on control commands. The channel can dynamically switch between transmitting to the EDID ROM (normal mode) and transmitting to the processor (specific mode), allowing the system to optimize signal transmission paths based on operational requirements, thereby maintaining reliability while reducing complexity.
Solution Approach 2:
The switch unit acts as an intermediary between the DDC channel and the destination components (EDID ROM or processor). This intermediary component ensures that control commands and process information are reliably routed to the correct destination, preventing signal confusion and maintaining transmission reliability even though a single channel serves multiple functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the transmission of low-speed common peripheral protocol commands and process information, enhancing system design capabilities while simplifying operations and reducing costs by utilizing existing HDMI channels for control commands.
Implementation Method 1
The detection circuit detects the control command of the control device, and the detection circuit controls a connection mode of the switch unit in the video device according to the control command
Implementation Method 2
The switch unit receives the process information through a Display Data Channel (DDC). The detection circuit detects the control command of the control device, and the detection circuit controls a connection mode of the switch unit in the video device according to the control command
Data Source
AI summary
A system and method for signal input control and a video device thereof are provided, adapted for a control device controlling the signal input to the video device. The method includes the following steps: the control device provides a process information and a control command; the video device detects the control commands and receives the process information through a Display Data Channel (DDC); and the video device controls the switch unit to transmit the process information to the Extended Display Identification Data (EDID) ROM or the processor according to the control command.