Multimedia Device Load Detection Circuit for External Display Power Management
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Solution Overview
Problem
Mobile multimedia devices cannot detect the connection status of external display devices, leading to excessive power consumption as both the internal and external displays show the same video data.
Innovation Solution
A load detection circuit is integrated into the multimedia device, comprising an isolation and buffer circuit, clamp circuit, amplifier circuit, integrating circuit, and voltage comparator circuit, which detects the connection status by analyzing horizontal sync signals and generates a control signal to manage video output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal display screen continues to display video data when an external display device is connected, then the video output function is maintained, but power consumption increases excessively
Solution Approach 1:
The video output circuit automatically detects the connection status of external display devices through its own output signals (horizontal synchronization signals) and automatically controls the display component accordingly, enabling the system to self-manage power consumption without requiring additional detection devices or manual user intervention
Solution Approach 2:
The patent implements a feedback mechanism where the video output circuit monitors its own output signals to detect whether an external display device is connected, and uses this detection information to automatically adjust the display component's operation state, creating a closed-loop control system that optimizes power consumption based on actual usage conditions
2Use of energy by moving object
If a load detection circuit is added to detect connection status, then power consumption can be optimized, but device complexity increases
Solution Approach 1:
The video output circuit serves multiple functions: it outputs video signals to external display devices, generates horizontal synchronization signals for detection purposes, and automatically controls the display component based on detected connection status. By making the video output circuit multi-functional, the patent eliminates the need for separate detection circuits, thereby reducing overall device complexity while still achieving power optimization
Solution Approach 2:
The patent combines the video signal output function and the connection detection function into a single integrated system. The horizontal synchronization signals that are inherently generated by the video output circuit are reused for detection purposes, merging what would traditionally be separate functions into one unified circuit that achieves both video output and automatic power management
Data Source
AI summary
A multimedia device generates and outputs video signals to a display component and an external display device, and includes a video output circuit and a load detection circuit. The load detection circuit isolates and buffers the video output circuit and the load detection circuit, and retrieves horizontal sync signals from the video signals. The load detection circuit further amplifies and integrates the retrieved horizontal sync signals to output direct current signals, and finally compares the direct current signals with a predetermined voltage to output a control signal indicating a connection between the video output circuit and the external display device. The multimedia device turns off the display component according to the control signal indicating that the video output circuit has been connected to the external display device.