Camera Module Integrating OIS and EIS for Movement Correction
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Solution Overview
Problem
Current camera modules face limitations in correcting movement due to external vibrations, as they rely on either optical image stabilization (OIS) or electronic image stabilization (EIS), with OIS being power-intensive and requiring additional components, and EIS having a limited range of correction due to image sensor size constraints.
Innovation Solution
A camera module that combines OIS and EIS using a lens assembly with liquid lenses and a stabilization controller to determine compensation values for both optical and electronic image stabilization, allowing for simultaneous and complementary correction of camera movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical image stabilization (OIS) is used to correct camera movement, then movement correction capability is improved, but power consumption increases and device complexity increases due to additional components
Solution Approach 1:
The patent combines optical image stabilization (OIS) and electronic image stabilization (EIS) into a unified system. The stabilization controller integrates both OIS and EIS functions, coordinating them to work together for comprehensive movement correction. This merging allows the system to achieve better stabilization performance while managing power consumption through coordinated operation of both methods.
Solution Approach 2:
The camera module is designed with multi-functionality to perform both optical and electronic image stabilization simultaneously. The lens assembly can be adjusted both physically (OIS) and electronically (EIS), and the image sensor can be dynamically adjusted. This universal design enables the system to handle various movement scenarios effectively.
2Reliability
If optical image stabilization (OIS) components are added to correct camera movement, then movement correction capability is improved, but device complexity increases
Solution Approach 1:
The patent merges OIS and EIS into a single integrated stabilization system. The stabilization controller acts as a central coordinator that manages both optical and electronic stabilization functions, reducing the need for separate independent systems. This integration simplifies the overall device architecture while maintaining comprehensive movement correction capabilities.
Solution Approach 2:
The lens assembly and image sensor are designed with multi-functional capabilities, allowing them to perform both optical and electronic stabilization functions. This universality reduces the need for additional dedicated components for each stabilization method, thereby reducing device complexity.
3Device complexity
If electronic image stabilization (EIS) is used to correct camera movement, then device complexity is reduced, but correction range is limited due to image sensor size constraints
Solution Approach 1:
The patent combines EIS with OIS to overcome the correction range limitations of EIS alone. While EIS provides low-complexity correction for small movements, OIS contributes to correcting larger movements through physical lens adjustment. The synergistic combination extends the overall correction range beyond what EIS could achieve independently.
Solution Approach 2:
The stabilization function is segmented into two complementary parts: EIS handles minor corrections efficiently, while OIS handles major corrections. The stabilization controller dynamically allocates correction tasks between the two methods based on movement magnitude, optimizing both complexity and correction range.
4Reliability
If both optical and electronic image stabilization are performed simultaneously, then correction range is extended, but coordination complexity increases
Solution Approach 1:
The stabilization controller uses feedback from the gyro sensor to continuously monitor camera movement and dynamically adjusts the coordination between OIS and EIS. Based on real-time movement data, the controller optimizes the compensation values for both stabilization methods, reducing coordination complexity through intelligent control.
Solution Approach 2:
The patent replaces complex mechanical coordination mechanisms with electronic control. Instead of mechanically synchronizing OIS and EIS, the system uses electronic signals and algorithms managed by the stabilization controller to coordinate both methods, simplifying the coordination process.
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 enhances the range and precision of movement correction, improving camera performance by leveraging both OIS and EIS technologies to compensate for various movements, thereby reducing the need for additional components and power consumption.
Implementation Method 1
a liquid lens configured to electrically adjust the curvature of an interface between two kinds of liquid
Implementation Method 2
a gyro sensor outputting a variation signal in response to movement of the lens assembly and the image sensor
Data Source
AI summary
The present invention provides a camera module includes a lens assembly including a plurality of lenses; an image sensor for converting an optical signal transferred through the lens assembly into an electric signal; a gyro sensor for outputting a variation signal in response to movement of the lens assembly and the image sensor; a stabilization controller for determining, in response to the variation signal, a first compensation value used to perform optical image stabilization (OIS) by driving at least one of the lenses and determining a second compensation value used to perform electronic image stabilization (EIS) by adjusting an effective area of the image sensor; and a movement correction device outputting a first control signal and a second control signal to perform image stabilization in response to the first compensation value and the second compensation value.