Head-Mounted Display Power Detection for Stable OTG Operation
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Solution Overview
Problem
Head mounted display devices often experience abnormal shutdowns due to insufficient power from handheld electronic devices, which is exacerbated by unclear and lower-than-expected On-The-Go (OTG) power output capabilities, leading to malfunctions and user discomfort.
Innovation Solution
The head mounted display device includes a power management system that detects power supply states in real time, enabling boot-up only when sufficient power is available, and enters a power saving mode when power is insufficient, notifying the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head mounted display device uses OTG power from handheld electronic devices, then portability and head-wearing comfort are improved, but power supply stability deteriorates due to unclear and lower-than-expected power output capabilities
Solution Approach 1:
The system performs preliminary detection of power supply capability through a detection circuit before the head mounted display device operates. The detection circuit measures the voltage and current output capability of the connected handheld electronic device, and the processor uses this information to determine whether the device can support normal operation, thereby preventing power-related failures before they occur.
Solution Approach 2:
The system implements a feedback mechanism where the detection circuit continuously monitors power supply parameters and feeds this information back to the processor. Based on the feedback regarding actual power output capability, the processor dynamically adjusts system operation mode or notifies the user of insufficient power, ensuring reliable operation under varying power conditions.
2Device complexity
If the head mounted display device operates without power detection, then device complexity is reduced, but abnormal shutdowns increase due to insufficient power
Solution Approach 1:
The patent introduces a detection circuit as an intermediary component between the power input interface and the main processor. This dedicated detection circuit separately monitors power supply parameters and provides information to the processor, enabling reliable power management without significantly increasing overall system complexity, as the detection function is handled by a specialized subsystem rather than the main processing unit.
3Use of energy by moving object
If the head mounted display device enters power saving mode, then power consumption is reduced to match insufficient supply, but operational functionality is limited
Solution Approach 1:
The system dynamically adjusts its operational state based on detected power supply capability. When insufficient power is detected, the processor transitions the device to a power saving mode with limited functionality. When sufficient power is available, the device operates with full functionality. This dynamic adaptation allows the system to optimize power consumption while maintaining user experience under different power conditions.
Data Source
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AI summary
A head mounted display device and a power management method are provided. The head mounted display device includes a host part and a power input part. The power input part is detachably connected to a power device and an electronic device. The power input part generates a first input signal according to a supply voltage value of the power device, and generates a second input signal according to power supply information of the electronic device. The host part enters a power saving mode or performs a boot-up operation according to the first input signal and the second input signal.