Handheld Device Motion-Triggered Light Source for Power Reduction
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Solution Overview
Problem
Interactive systems, such as virtual reality and pointing systems, face challenges in reducing power consumption due to the high energy demand of light sources, particularly infrared light sources, which are often used for optical sensing, leading to larger and heavier handheld devices.
Innovation Solution
The system incorporates an operation detector, such as an accelerometer or touch panel, to determine when the device is being operated, and only then activates the light source, reducing unnecessary power consumption by controlling the light source's power supply based on detected acceleration or touch signals, and adjusting its emission features accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light source is continuously activated to enhance optical sensing efficiency, then the sensing performance is improved, but the power consumption increases significantly
Solution Approach 1:
The light source is activated periodically based on detected motion patterns rather than continuously. The system detects acceleration patterns and triggers light emission only during relevant periods, transforming continuous operation into periodic operation to reduce overall power consumption while maintaining sensing effectiveness during active periods
2Use of energy by moving object
If the light source is activated only when motion is detected, then power consumption is reduced, but the optical sensing efficiency may be compromised
Solution Approach 1:
The system performs preliminary detection using the acceleration sensor to anticipate when optical sensing will be needed. By detecting motion patterns in advance, the system activates the light source before actual optical sensing is required, ensuring the light is already on when needed while avoiding unnecessary activation during static periods
Solution Approach 2:
The system uses feedback from the acceleration sensor to dynamically control the light source activation. The detection results from the motion sensor feed back to the control logic, which adjusts light emission timing and duration based on actual usage patterns, optimizing the balance between power consumption and sensing efficiency
3Use of energy by moving object
If a large capacity battery is used to support continuous light source operation, then the power consumption requirement is met, but the device volume and weight increase
Solution Approach 1:
By transforming continuous light operation into periodic operation based on motion detection, the total energy consumption is dramatically reduced. This allows the use of smaller capacity batteries that are lighter in weight, while still providing sufficient power during the periodic active periods when the light source is actually needed
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
This approach significantly reduces the total power consumption of handheld devices by ensuring the light source is only active when the device is in use, thereby minimizing battery size and weight while maintaining effective optical sensing.
Implementation Method 1
The operation detector is configured to detect whether the electric device is being operated, wherein the light source is turned on once the operation detector detects an acceleration value exceeding a predetermined value
Data Source
AI summary
There is provided a handheld device for an interactive system. The handheld device identifies the timing that a user operates the handheld device to determine whether to turn on an indicating light for optical sensing to avoid the unnecessary power consumption.