Optical Navigation System Standby Power Reduction
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Solution Overview
Problem
Optical navigation systems consume significant power even in standby mode due to the continuous need for optical sensors to operate, despite reduced frame rates or resolution.
Innovation Solution
An optical navigation system with a main control circuit and an independent activating device that transitions the optical sensor from a standby mode to an active mode based on specific actions, such as user input or movement, allowing the sensor to conserve power by not sensing data in standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical sensor operates in ready mode with lower frame rate or resolution, then the system can maintain navigation capability, but power consumption remains high
Solution Approach 1:
The system divides the optical sensor operation into distinct segments: active mode for full navigation capability and standby mode for minimal power consumption. The activating device independently controls transitions between these segments, allowing the optical sensor to be completely deactivated during standby while navigation capability is restored quickly upon activation.
Solution Approach 2:
The system implements periodic activation rather than continuous operation. The optical sensor alternates between active and standby modes based on navigation requirements, with the activating device triggering periodic activation events. This periodic action significantly reduces average power consumption while maintaining necessary navigation functionality.
2Use of energy by moving object
If the optical sensor is completely deactivated to save power, then power consumption decreases, but the system cannot respond to navigation requirements
Solution Approach 1:
The activating device is pre-configured with activation conditions and criteria before the optical sensor is deactivated. When navigation requirements are detected, the activating device can immediately trigger activation without waiting for the sensor to be reinitialized, ensuring rapid response while maintaining low power consumption during standby periods.
Solution Approach 2:
The activating device serves as an intermediary between the standby state and the optical sensor. It monitors navigation requirements and mediates the activation process, ensuring the sensor is activated only when necessary and can be quickly reactivated from standby mode without full reinitialization, thus balancing power savings with response speed.
Data Source
AI summary
Disclosed is an optical navigation system, which comprises: a main control circuit; an activating device, coupled to the main control circuit; and an optical sensor, coupled to the main control circuit and the activating device. The main control circuit controls the activating device to transit from a first standby mode to a first active mode when the optical sensor enters a second standby mode. The activating device generates an activating command to transit the optical sensor from the second standby mode to a second activate mode corresponding to a specific action, when the activating device is in the first active mode. By this way, the optical sensor can be activated via another device rather than the optical data sensed by itself, thus the power consumption can be reduced.