Inductive Charging Head-Mounted Display With Dynamic Power Control
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Solution Overview
Problem
Conventional conductive charging methods for wearable devices like head-mounted displays expose charging contacts to contaminants such as body oils, sweat, and environmental dust, leading to degradation and potential leaks, whereas wireless charging isolates power receiving components from these contaminants but may not efficiently manage power transfer rates for user comfort.
Innovation Solution
A head-mounted display system with inductive charging, featuring receiving coils integrated into the head support and a power supply device with transmission coils that align for efficient electromagnetic field transfer, allowing for adjustable power rates based on the device's usage state, thereby minimizing heat generation and user discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive charging contacts are used for power transfer, then efficient power transfer can be achieved, but the charging contacts are exposed to contaminants such as body oils, sweat, and environmental dust leading to degradation and potential leaks
Solution Approach 1:
The patent replaces the mechanical contact-based conductive charging system with an electromagnetic field-based inductive charging system. The transmitting coil in the power supply device generates an electromagnetic field that induces current in the receiving coil of the head-mounted display, eliminating the need for physical charging contacts and thereby preventing contaminant exposure and degradation.
2Reliability
If wireless inductive charging is used to isolate power receiving components from contaminants, then reliability is improved, but power transfer rates may not be efficiently managed for user comfort
Solution Approach 1:
The patent implements dynamic power management by adjusting the power transfer rate based on the device's usage state. The system can operate in different modes: when the head-mounted display is not worn, it charges the power storage device at a higher rate; when worn by a user, it reduces the power transfer rate to minimize heat generation and improve user comfort.
3Productivity
If high power transfer rates are used for fast charging, then charging speed is improved, but heat generation increases causing user discomfort when the device is worn
Solution Approach 1:
The patent employs periodic or conditional power transfer action based on usage detection. The system periodically assesses whether the device is being worn and adjusts power transfer accordingly - enabling high-power fast charging when not worn, and reducing or pausing power transfer when worn to prevent excessive heat generation and user discomfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The inductive charging system effectively isolates internal components from contaminants, provides flexible power management to optimize user comfort by adjusting power transfer rates, and allows for a more reliable and user-friendly operation of head-mounted displays.
Implementation Method 1
The one or more receiving coils are coupled to the head support and located rearward of the display unit for inductively charging the power storage device
Implementation Method 2
the transmission coil to produce an electromagnetic field that passes through the receiving coil for charging the power storage device
Data Source
AI summary
A head-mounted display includes a display unit, a head support, a power storage device, and one or more receiving coils. The head support is coupled to the display unit and configured to engage a head of a user for supporting the display unit thereon. The power storage device is coupled to the display unit for storing power to be supplied to the display unit. The one or more receiving coils are coupled to the head support for inductively charging the power storage device.