Optical Mouse Power-Saving Module Using Dual Sensor Segmentation
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Solution Overview
Problem
Optical mice face inefficiencies in power-saving modes due to image noise affecting displacement signal accuracy and prolonged exposure times, leading to increased electricity consumption.
Innovation Solution
A power-saving sensing module for optical mice that includes a light source, first and second sensors, detection units, and a control unit to periodically turn the light source on and off, using a second sensor to detect touch signals to determine whether to generate displacement signals or enter a power-saving state, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image sensor uses a long exposure time to sense displacement signals, then the sensing accuracy is improved, but the electricity consumption increases
Solution Approach 1:
The patent divides the sensing function into two independent sensors: a first sensor for displacement detection and a second sensor for touch detection. This segmentation allows the system to use the second sensor to detect user interaction and suppress displacement signal generation when no touch is detected, thereby reducing unnecessary power consumption while maintaining accuracy when needed.
2Loss of energy
If the mouse enters power-saving mode to reduce electricity consumption, then the power-saving effect is improved, but the response time to detect user operation increases
Solution Approach 1:
The patent implements preliminary touch detection using the second sensor before entering full power-saving mode. When the second sensor detects a touch signal, the system preemptively activates the first sensor to generate displacement signals, ensuring immediate response to user operations without the delay of waiting for displacement signal detection after mode entry.
Solution Approach 2:
The patent uses feedback from the second sensor's touch detection to control the first sensor's operation. When touch is detected, the system feedback-activates the first sensor to generate displacement signals, creating a responsive feedback loop that maintains low latency while preserving power-saving benefits during non-touch periods.
3Speed
If the image sensor continuously detects displacement signals to ensure responsive operation, then the operational responsiveness is improved, but the electricity consumption increases
Solution Approach 1:
The patent makes the sensing system dynamic by adjusting the first sensor's operation state based on real-time touch detection from the second sensor. The first sensor operates dynamically - active when touch is detected and suppressed when no touch is detected - optimizing the balance between responsiveness and power consumption rather than maintaining a static continuous operation state.
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
Enhances power-saving effects by reducing unnecessary energy consumption and improving accuracy in determining when to enter power-saving modes, ensuring efficient operation of optical mice.
Implementation Method 1
a light source for providing a light ray
Implementation Method 2
a first sensor for detecting a first image corresponding to a working plane in response to at least a part of the light ray to generate a first sensing signal
Data Source
AI summary
A power-saving sensing module includes a light source, first and second sensors, first and second detection units, and a controller. The first sensor detects a first image corresponding to a working plane in response to at least a part of the light ray from the light source to generate a first sensing signal. The first detection unit generates a displacement signal in response to the first sensing signal. The second sensor detects a second image corresponding to an object in response to at least a part of light ray to generate a second sensing signal. The second detection unit generates a touch signal corresponding to the object in response to the second sensing signal. The controller outputs a control signal in response to the touch signal. The first detection unit operates at a dormant state or a sensing state in response to the control signal.