Tunable Polarization Layers in Image Sensor Packages
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Solution Overview
Problem
Conventional imaging systems with passive polarization filters lack versatility and are inefficient in managing reflections and glare, which affects the performance of image sensors.
Innovation Solution
Integration of a tunable polarization filter directly into the image sensor package, allowing for controlled modulation of light polarization at a global, sub-array, or pixel level, using a liquid crystal layer with electrodes to switch between different polarization states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive polarization filters are used external to the image sensor package, then the system can achieve polarization filtering, but the system size and weight increase, and versatility is reduced
Solution Approach 1:
The patent merges the polarization filter with the image sensor package by integrating a tunable polarization layer into the package structure. This combination eliminates the need for separate external polarization filters, thereby reducing system weight and increasing versatility through integrated control capabilities.
Solution Approach 2:
The patent employs a tunable polarization layer that can dynamically adjust its polarization state in response to control signals. This dynamic capability allows the filter to adapt to different imaging conditions, enhancing versatility compared to fixed passive filters while maintaining a compact integrated structure.
2Reliability
If passive polarization filters are used external to the image sensor package, then polarization filtering is achieved, but optical losses and image artifacts increase
Solution Approach 1:
By integrating the polarization layer directly into the image sensor package, the patent minimizes the number of air-glass interfaces and optical components that cause reflections and absorption losses. This merged structure reduces optical losses and associated image artifacts compared to external filter configurations.
3Adaptability or versatility
If passive polarization filters are used, then the structure is simple, but the system lacks tunability and adaptability to different imaging conditions
Solution Approach 1:
The patent introduces a tunable polarization layer with control circuitry that can adjust polarization states dynamically. This dynamic element provides adaptability to different imaging conditions while maintaining a relatively compact integrated structure, balancing the trade-off between tunability and complexity.
Solution Approach 2:
The integrated tunable polarization layer serves multiple functions: it acts as a polarization filter, a tunable optical element, and a controllable component within the image sensor package. This multi-functionality enhances adaptability without proportionally increasing system complexity.
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
Enhances the versatility and performance of imaging systems by reducing system size and weight, mitigating optical losses and image artifacts, and improving global shutter efficiency and dynamic range.
Implementation Method 1
a tunable polarization layer 140 that is interposed between a lens and the image sensor die 122. The tunable polarization layer 140 may include a liquid crystal layer 110
Implementation Method 2
The liquid crystal layer 110 may be tuned from a first state in which the liquid crystal layer 110 passes light having a first polarization to a second state in which the liquid crystal layer 110 blocks the light having the first polarization
Data Source
AI summary
Imaging systems may include tunable polarization filters. A tunable polarization filter may be integrated directly into an image sensor package. For example, the tunable polarization filter may serve as cover glass for the image sensor package. Tunable polarization package glass may be incorporated into image sensor packages that have air gaps between the image sensor and the cover glass or that have transparent adhesive between the image sensor and the cover glass. The tunable polarization layer may be controlled at a global level, at a sub-array level, or at a pixel level. In some cases, the tunable polarization layer may be a tunable polarization filter. In this example, the direction of the polarization filter is tuned. In other cases, the tunable polarization layer may be a tunable polarization rotator. In this example, the tunable polarization layer selectively rotates the polarization of light that passes through the tunable polarization layer.