Display Wake-Up via Standby Controller Port Scanning
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Solution Overview
Problem
Current computing systems experience slow display bring-up times due to continuous port scanning for video source detection, leading to consumer perception of slow desktop computer wake-up times compared to mobile devices.
Innovation Solution
Implementing a fast port scan procedure using a standby controller to identify physically connected ports and store connection attributes for quick restoration upon exit from standby, reducing unnecessary polling and enhancing the display wake-up process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous port scanning is performed to detect video source device, then port detection reliability is improved, but display bring-up time increases
Solution Approach 1:
The system performs preliminary port scanning and stores connection attributes when the video source device is first connected. This pre-stored information is then reused during standby wake-up events, eliminating the need for full port scans and significantly reducing bring-up time while maintaining detection reliability.
Solution Approach 2:
The patent extracts only the essential connection attributes (such as port identification and connection status) needed for quick wake-up detection, rather than performing complete port scans. This selective extraction of necessary information allows fast wake-up while maintaining sufficient detection capability.
2Measurement precision
If full port scanning is performed upon wake-up, then connection detection accuracy is improved, but power consumption increases
Solution Approach 1:
Instead of performing complete port scans during wake-up, the system performs partial scanning using pre-stored connection attributes. This partial action provides sufficient detection accuracy for the wake-up scenario while dramatically reducing power consumption compared to full scanning.
3Speed
If multiple ports are scanned simultaneously, then detection speed is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary port scanning and stores connection attributes in advance. During wake-up events, it only needs to check the pre-stored attributes rather than simultaneously scanning multiple ports, achieving fast detection while maintaining simpler device architecture.
Data Source
AI summary
An apparatus comprising an interface to receive a video signal transmitted by a video source device to a first port of a plurality of ports of a display; and a controller comprising circuitry, the controller to responsive to a detection that the video source device is to enter a standby mode, cause the display to enter a low power state; and upon waking from the low power state, scan the first port of the plurality of ports for a communication from the video source device and quiesce scanning of the remaining one or more ports of the plurality of ports of the display.