USB Type-C Display Signal Source Switching via Channel State
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Solution Overview
Problem
Current display devices waste time switching signal sources, especially with USB Type-C connectors, which can transmit multiple signals simultaneously, requiring manual detection of active sources.
Innovation Solution
A display device with a USB Type-C connector module, configuration channel logic IC, and channel switching multiplexer, where a processing unit determines the channel setting state and controls the audio/video signal switching unit to automatically switch to an active USB Type-C signal source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the display device switches signal source one by one for each input connector to detect active signal, then the signal source can be detected, but it wastes lots of time on detecting inactive signal source
Solution Approach 1:
The configuration channel logic IC reads the channel setting state in advance from the channel switching multiplexer before signal source switching is needed. This preliminary reading stores the channel assignment information, so when switching is required, the processing unit can directly query the pre-stored state instead of detecting each connector sequentially, thereby saving time and improving switching efficiency
2Adaptability or versatility
If multiple input connectors with identical or different signal formats are provided, then the display device can support various signal sources, but the user has to spend much time to switch signal source
Solution Approach 1:
The system automatically determines whether to switch signal source by having the processing unit query the channel setting state from the configuration channel logic IC and compare it with the current connector state. This self-service mechanism eliminates the need for manual user intervention in signal source switching, thereby improving ease of operation while maintaining support for multiple signal formats through the versatile channel switching multiplexer
3Adaptability or versatility
If the USB Type-C connector is used to transmit power, audio/video signal, and data simultaneously, then the connector functionality is enhanced, but signal source switching becomes more complex
Solution Approach 1:
The channel switching multiplexer is designed to handle multiple signal types (video, audio, data) through a unified channel setting state management system. The configuration channel logic IC reads a single comprehensive state that encompasses all signal types, allowing the USB Type-C connector to transmit power, audio/video, and data simultaneously while maintaining simple switching control through the processing unit querying the unified channel state
Data Source
AI summary
A display device includes a USB Type-C connector module, an audio/video signal switching unit, a processing unit, and a display unit. The USB Type-C connector module includes a USB Type-C connector, a configuration channel logic IC, and a channel switching multiplexer. The processing unit selectively reads a channel setting state from one of the configuration channel logic IC and the channel switching multiplexer and determines whether the channel setting state includes an audio/video channel. When the processing unit determines that the channel setting state includes the audio/video channel, the processing unit controls the audio/video switching unit to switch a signal source of the display unit to a signal source of the USB Type-C connector module.