OIS Circuit Synchronization Single Gyro Sensor
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Solution Overview
Problem
The increasing number of camera modules in electronic devices leads to higher manufacturing costs due to the need for multiple gyro sensors, and using a single gyro sensor can result in synchronization issues with optical image stabilization (OIS) circuits.
Innovation Solution
An OIS circuit configuration that includes a main OIS circuit and sub-OIS circuits synchronized with a single sensor, utilizing a serial peripheral interface (SPI) for communication and a timer to generate interruption signals for control operations, allowing multiple sub-OIS circuits to share sensor data from a single gyro sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gyro sensors are used for multiple camera modules, then each camera module has dedicated sensor data, but manufacturing costs increase
Solution Approach 1:
A single gyro sensor is designed to serve multiple OIS circuits simultaneously. The sensor outputs data that is shared among multiple drivers through a common data line, allowing one sensor to perform the function that would otherwise require multiple sensors, thereby reducing manufacturing costs while maintaining data availability for each camera module
Solution Approach 2:
Multiple OIS circuits are merged to share a common gyro sensor and common data line. The sensor data from a single gyro sensor is combined and distributed to multiple drivers, eliminating the need for separate sensor connections for each camera module and reducing overall system complexity and cost
2Device complexity
If a single gyro sensor is used for multiple OIS circuits, then manufacturing cost is reduced, but synchronization issues arise among OIS circuits
Solution Approach 1:
A timer generates periodic interruption signals at predetermined intervals that are sent to multiple OIS circuits. This periodic action ensures that all OIS circuits synchronized to the same timer will execute their control operations simultaneously, maintaining synchronization accuracy while sharing a single gyro sensor
Solution Approach 2:
The system uses a common data line to provide feedback from the single gyro sensor to multiple OIS circuits. This feedback mechanism ensures all circuits receive the same sensor data simultaneously, enabling synchronized operation while reducing component count and manufacturing cost
3Device complexity
If multiple drivers are connected to a single sensor, then component count is reduced, but data sharing and synchronization become complex
Solution Approach 1:
A common data line acts as an intermediary between the single gyro sensor and multiple OIS circuits. This intermediary efficiently distributes sensor data to all connected drivers without requiring complex data sharing protocols, simplifying the control mechanism while reducing component count
Data Source
AI summary
An optical image stabilization (OIS) circuit, applied to an OIS device including a single sensor configured to provide sensor data is provided. The OIS circuit includes a main OIS circuit configured to output a control signal to the sensor, and receive the control signal from the sensor with sensor data, output an interruption signal to initiate a control operation, and control a main OIS operation, and a sub-OIS circuit configured to be synchronized with the main OIS circuit based on the control signal input with the sensor data, and control a sub OIS operation based on the interruption signal.