OIS Driver Circuit Gain Calibration for Posture-Dependent Lens Stabilization
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Solution Overview
Problem
Existing optical image stabilization systems in electronic devices face challenges in maintaining uniform position stabilization of the lens due to the influence of gravity, which varies with the device's posture.
Innovation Solution
The system integrates a driver circuit responsive to a gyro sensor and an actuator, calibrating the gain applied to the drive signal based on the device's posture to compensate for gravity's effect and maintain precise lens positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the OIS system uses fixed gain calibration, then the system structure remains simple, but the lens position accuracy deteriorates when the device posture changes due to gravity's non-uniform influence
Solution Approach 1:
The patent implements dynamic gain calibration by adjusting the drive signal gain based on the detected device posture. The system transitions from a fixed gain approach to a dynamic gain approach where the gain value changes according to the device's orientation, thereby maintaining lens position accuracy across different postures while managing system complexity through selective adaptation.
Solution Approach 2:
The patent changes the electrical parameter (gain value of the drive signal) based on the device posture detected by sensors. By modifying the gain parameter dynamically according to gravitational influence at different orientations, the system compensates for posture-dependent position drift without requiring complete system redesign.
2Reliability
If the system applies uniform stabilization across all postures, then the control algorithm remains simple, but the actual lens position deviates from target position due to gravity's varying effect
Solution Approach 1:
The control algorithm transitions from a static, uniform stabilization approach to a dynamic approach that adapts to device posture. The system detects posture changes and adjusts stabilization parameters accordingly, ensuring reliable position control across varying gravitational conditions while maintaining reasonable algorithmic complexity through modular implementation.
Solution Approach 2:
The patent implements feedback mechanisms where the actual lens position is continuously monitored and compared against the target position. Based on this feedback and the detected device posture, the system adjusts the drive signal gain to compensate for gravitational effects, thereby improving stabilization reliability without requiring overly complex control algorithms.
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 ensures that the lens maintains its target position accurately across various postures of the electronic device, effectively addressing the non-uniform influence of gravity on the optical image stabilization system.
Implementation Method 1
A driver circuit responsive to a gyro sensor and a feedback signal from an actuator
Implementation Method 2
as the posture of the electronic device changes, gravity may influence the optical image stabilization system and/or a position of the lens in a non-uniform manner
Data Source
AI summary
Various embodiments of the present technology may provide methods and systems for position stabilization. The methods and systems for position stabilization may be integrated within an electronic device. An exemplary system may include a driver circuit responsive to a gyro sensor and a feedback signal from an actuator. The driver circuit may be configured to calibrate a gain applied to a drive signal based on the posture of the electronic device.