Wireless Mouse Displacement Detection Power Management
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Solution Overview
Problem
Wireless optical mice face high power consumption due to active components like light sources and image sensors, leading to short battery life, and existing methods to reduce power consumption, such as changing sampling frequency or lighting frequency, result in instability and varying current consumption.
Innovation Solution
A displacement detection device with an image sensor, light source, and processing unit that adjusts the lighting pattern based on displacement, turning the light source on for N successive frames and off for M successive frames, maintaining a consistent lighting frequency across speed modes to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the lighting frequency of the light source is changed to reduce power consumption, then power consumption is reduced, but the current consumption varies significantly across different lighting frequencies
Solution Approach 1:
The light source operates in periodic intervals with alternating high-speed and low-speed modes. In high-speed mode, the light source illuminates at a higher frequency to capture rapid movements, while in low-speed mode, it illuminates at a lower frequency to save power during stationary or slow periods. This periodic switching between modes enables the system to adapt to varying displacement conditions while maintaining stable average current consumption.
Solution Approach 2:
The lighting frequency is dynamically adjusted based on the detected displacement of the wireless optical mouse. The processing unit monitors movement characteristics and switches between high-speed and low-speed illumination modes accordingly. This dynamic adaptation allows the light source to provide appropriate lighting frequency for accurate displacement detection while optimizing power consumption based on actual usage conditions.
2Use of energy by moving object
If the sampling frequency or exposure time of the image sensor is changed to reduce power consumption, then power consumption is reduced, but the total intensity of the image frame varies significantly resulting in poor stability
Solution Approach 1:
The image sensor operates continuously at a fixed sampling frequency and exposure time, ensuring stable image frame capture conditions. By maintaining constant sensor parameters, the system ensures that the total intensity of captured image frames remains stable regardless of movement speed. The power optimization is achieved instead through the periodic control of the light source rather than varying sensor parameters.
3Measurement precision
If the light source illuminates at high frequency to capture fast movements, then displacement detection accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The system dynamically switches between high-speed and low-speed illumination modes based on the detected displacement characteristics. When fast movement is detected, the light source operates at high frequency to capture the rapid changes accurately. When the device is stationary or moving slowly, the light source switches to low-speed mode to reduce power consumption. This dynamic adaptation allows the system to maintain high measurement precision when needed while minimizing energy consumption during normal operation.
Solution Approach 2:
The lighting frequency parameter is changed based on the operational state of the wireless optical mouse. The processing unit monitors displacement and adjusts the lighting frequency accordingly, switching between different illumination speeds. This parameter change enables the system to optimize the balance between measurement precision and power consumption by using high-frequency lighting only when necessary for accurate displacement detection.
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 reduces total power consumption while maintaining stability and accuracy in displacement detection, ensuring consistent current consumption across different speed modes and improving battery life.
Implementation Method 1
an image sensor and a light source. The image sensor is configured to capture image frames at a sampling frequency
Data Source
AI summary
There is provided a displacement detection device including an image sensor, a light source, a light control unit and a processing unit. The image sensor captures image frames at a sampling frequency. The light source provides, in a speed mode, light for the image sensor in capturing the image frames. The light control unit controls the light source with the speed mode to turn on at a lighting frequency or to turn off serially. The processing unit calculates a displacement according to the image frames captured when the light source turns on to be served as an estimated displacement for an interval during which the light source turns off. There is further provided an operating method of a displacement detection device.