OIS Driver Gain Calibration for Posture-Dependent Lens Positioning
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Solution Overview
Problem
Optical image stabilization systems in electronic devices face challenges due to non-uniform influence of gravity on lens positioning as the device posture changes, leading to variations in actual lens position when attempting to stabilize images.
Innovation Solution
A system integrating a driver circuit responsive to a gyro sensor and feedback signals from an actuator, which calibrates a gain applied to a drive signal based on the device's posture to compensate for gravity's effect, ensuring accurate lens positioning across different postures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If optical image stabilization system operates with fixed gain, then system complexity is reduced, but lens positioning accuracy deteriorates due to non-uniform gravity influence across different postures
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed gain system to a dynamic gain calibration system. The driver circuit now adjusts the gain value based on detected device postures, making the stabilization system adaptive rather than static. This resolves the contradiction by allowing the system to maintain high positioning accuracy across varying postures while keeping the overall architecture relatively simple through posture-based gain adjustment.
Solution Approach 2:
The patent changes the parameter being controlled from a fixed gain value to a variable gain value that depends on device posture. By calibrating different gain values for different postures (e.g., portrait, landscape, tilted positions), the system maintains accurate lens positioning regardless of how the device is held. This parameter change approach directly addresses the non-uniform gravity influence mentioned in the problem statement.
2Manufacturing precision
If gain is calibrated based on device posture, then lens positioning accuracy is improved across different postures, but device complexity increases due to additional calibration requirements
Solution Approach 1:
The patent implements feedback by using the gyro sensor to detect device posture and feeding this information back to the driver circuit, which then selects the appropriate calibrated gain value. This closed-loop feedback mechanism automatically adjusts the stabilization parameters based on real-time posture detection, improving positioning accuracy without requiring manual intervention or complex additional hardware.
Solution Approach 2:
The system performs self-calibration and self-adjustment based on detected postures. The driver circuit automatically selects the appropriate gain value from pre-calibrated values based on the current device orientation, eliminating the need for external calibration equipment or manual adjustment. This self-service approach reduces the practical complexity despite adding calibration functionality.
3Ease of operation
If fixed gain is used in drive signal, then ease of operation is maintained, but image stabilization performance deteriorates under varying gravitational conditions
Solution Approach 1:
The patent applies preliminary action by pre-calibrating multiple gain values for different device postures before actual operation. During use, the system simply detects the current posture and applies the corresponding pre-calibrated gain, eliminating the need for real-time complex calculations or manual adjustment. This preliminary calibration approach maintains ease of operation while significantly improving stabilization reliability across varying gravitational conditions.
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 system effectively stabilizes the lens position across various postures, maintaining image quality by adjusting the drive signal to account for gravity's influence, thereby correcting involuntary and voluntary movements.
Implementation Method 1
A system integrating a driver circuit responsive to a gyro sensor and feedback signals from an actuator
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.