External Display Detection Circuit for Stable Power Switching
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Solution Overview
Problem
Conventional systems that turn a display circuit on/off based on connection state with an external display device can lead to frequent enabling, causing idle power consumption and affecting user experience when the external device is frequently plugged or unplugged.
Innovation Solution
A detecting circuit and method that includes a control circuit to detect the external display device, accumulate duration or number of undetected connections, and only disconnect power when a threshold is reached, preventing unnecessary power consumption and system busy states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display circuit is turned on/off based on connection state detection, then idle power consumption is reduced, but the system frequently enables the display circuit when the external device is frequently plugged or unplugged
Solution Approach 1:
The control circuit performs preliminary detection of the external display device through the connector before enabling the display circuit. It accumulates detection results over a predetermined time period to confirm stable connection before activating power supply, preventing premature or frequent enabling of the display circuit
2Ease of operation
If the display circuit is turned on immediately upon detecting connection, then user experience is maintained, but idle power consumption occurs when connection is unstable
Solution Approach 1:
The control circuit continuously monitors the connection state of the external display device through repeated detection cycles. It uses the accumulated detection feedback to determine whether to maintain or terminate power supply to the display circuit, ensuring power is supplied only when connection stability is confirmed through multiple detection cycles
Data Source
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AI summary
A detecting circuit of an external display device includes a first connector, a display circuit configured to provide a display signal to the external display device through the first connector, a switch circuit, a power supply circuit configured to provide power needed for operating the display circuit through the switch circuit when the switch circuit is on, and a control circuit configured to turn on the switch circuit upon detecting the external display device so as to connect the power supply circuit to the display circuit. When the switch circuit is on, the control circuit accumulates a duration or a number of times of detection that the external display device is continually not detected, and then turns off the switch circuit to disconnect the power circuit from the display circuit when the duration reaches a time threshold or the number of times of detection reaches a count threshold.