Optical Mouse Displacement Detection Power Management
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Solution Overview
Problem
Conventional optical mice consume excessive power, particularly at high speeds, due to fixed light source emission frequencies, leading to reduced battery life and increased current consumption.
Innovation Solution
A displacement detection device that dynamically adjusts both the emission frequency and duration of the light source, as well as the image gain of the image sensor, to maintain consistent current consumption and image brightness, thereby reducing total power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the light source emission frequency is increased to detect high-speed movement, then the displacement detection capability is improved, but the current consumption of the light source increases significantly
Solution Approach 1:
The patent applies dynamics by making the light source emission frequency adjustable rather than fixed. The system dynamically changes the emission frequency based on the detected displacement magnitude - using higher frequencies when movement is detected and lower frequencies when movement is minimal, thereby adapting the power consumption to the actual operational needs
Solution Approach 2:
The patent changes the emission frequency parameter of the light source based on displacement detection results. When displacement exceeds a threshold, the system increases the emission frequency to capture high-speed movement accurately. When displacement is below the threshold, the system reduces the emission frequency to lower power consumption, thus resolving the contradiction between detection capability and energy usage
2Use of energy by moving object
If the light source emission frequency is reduced to save power, then the current consumption is lowered, but the image brightness and detection accuracy deteriorate
Solution Approach 1:
The system dynamically adjusts the emission frequency based on real-time displacement detection. When the mouse is stationary or moving slowly, the system uses lower emission frequencies to save power. When the mouse moves quickly, the system automatically increases the emission frequency to maintain detection accuracy, thus balancing power savings with measurement precision
Solution Approach 2:
The patent implements feedback by using the displacement detection results to control the light source emission frequency. The processing unit continuously monitors displacement and adjusts the emission frequency accordingly, creating a closed-loop system that ensures adequate detection accuracy while minimizing power consumption based on actual operational conditions
3Illumination intensity
If the light source is kept on continuously to maintain image brightness, then the image quality is preserved, but the average current consumption increases
Solution Approach 1:
Instead of continuous operation, the patent employs periodic action by controlling the light source to emit at specific intervals based on displacement detection. The light source is activated when displacement exceeds the threshold and deactivated or reduced when displacement is minimal, maintaining image brightness only when needed for accurate detection while reducing average power consumption
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 solution effectively keeps the average current consumption of the light source low, reducing total power consumption while maintaining image brightness and stability across different speed modes.
Implementation Method 1
The light source is configured to provide light with at least one emission frequency and at least one emission duration for the image sensor in capturing the images
Implementation Method 2
The image sensor receives reflected light from the work surface and successively outputs image frames
Implementation Method 3
The image sensor receives reflected light from the work surface and successively outputs image frames
Data Source
AI summary
A displacement detection device includes an image sensor, a light source and a processing unit. The image sensor is configured to successively capture images. The light source provides light with an emission frequency and an emission duration for the image sensor in capturing the images. The processing unit is configured to calculate a displacement according to the images and to adjust both the emission frequency and the emission duration according to the displacement.