External Display Detection Circuit With Delayed Power Cutoff
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Solution Overview
Problem
Conventional systems that turn a display circuit on and off based on connection state with an external display device can lead to frequent enabling and disabling, causing idle power consumption and affecting user experience when the external device is frequently plugged and unplugged.
Innovation Solution
A detecting circuit and method that includes a control circuit to detect the external display device, accumulating duration or number of undetected connections to determine when to turn off the power supply path, 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 immediately upon detecting connection/disconnection of external display device, then power consumption is reduced, but the system becomes busy and user experience deteriorates due to frequent enabling/disabling
Solution Approach 1:
The control circuit performs preliminary detection of the external display device connection state before activating the display circuit. When disconnection is detected, the system waits for a predetermined time period to confirm stable disconnection before turning off the display circuit, preventing premature power cutoff that would cause frequent enabling/disabling cycles
2Ease of operation
If the display circuit remains on continuously to avoid frequent enabling/disabling, then user experience is maintained, but idle power consumption increases
Solution Approach 1:
The display circuit's power state transitions dynamically based on real-time detection of external display device connection status. The system adapts between on and off states by detecting connection events and applying a stabilization delay, allowing the circuit to remain off during prolonged disconnection while avoiding frequent state changes during transient connection events
Data Source
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.