Microbolometer Focal Plane Arrays With Shared Contacts
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Solution Overview
Problem
Microbolometer focal plane arrays face challenges with reduced performance due to increased contact area as dimensions shrink, leading to higher noise and crosstalk from column-to-column short defects in conventional designs with separate contacts.
Innovation Solution
Implementing microbolometer focal plane arrays with shared contacts and additional switches within unit cells, along with specific readout timing techniques to isolate defects and reduce noise and crosstalk, such as using previously read out microbolometers to isolate current ones from defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate contacts are used for each microbolometer, then each microbolometer has dedicated signal paths, but the contact area consumes a greater percentage of the microbolometer area as dimensions are reduced
Solution Approach 1:
The patent merges contacts between adjacent microbolometers by implementing shared column contacts that serve multiple microbolometer elements. Instead of each microbolometer having completely separate contacts, the column contacts are shared resources that reduce the total contact area while maintaining signal path integrity through the shared contact structure.
2Area of moving object
If shared contacts are implemented in microbolometer arrays, then contact area is reduced, but susceptibility to column-to-column short defects increases
Solution Approach 1:
The patent segments the contact structure into row contacts and column contacts that intersect at specific points. This segmentation allows the shared contacts to be organized in a grid pattern where row-specific and column-specific contacts are separated, reducing the risk that a single defect will affect entire columns while still maintaining the area benefits of sharing.
Solution Approach 2:
The patent introduces switch elements as intermediaries between the shared column contacts and the microbolometer elements. These switches act as isolation mechanisms that can prevent defect propagation, allowing the system to benefit from shared contacts while mitigating the risk of column-to-column short defects through the intermediary switching structure.
3Reliability
If additional switches are included in the unit cell, then defect isolation capability is improved, but device complexity increases
Solution Approach 1:
The patent implements switches that serve multiple functions: they enable defect isolation by blocking defect propagation paths, they facilitate readout control by selecting which microbolometer elements are active, and they provide routing control for signal paths. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
Data Source
AI summary
Systems and methods for microbolometer focal plane arrays provide for the selection of microbolometers within the microbolometer focal plane arrays. In accordance with an embodiment, a microbolometer focal plane array includes a plurality of microbolometers forming a microbolometer array, wherein contacts within the microbolometer array are shared by the microbolometers; a first plurality of switches adapted to provide a voltage to respective ones of the plurality of microbolometers; a second plurality of switches adapted to receive an output signal from respective ones of the plurality of microbolometers; and a third plurality of switches adapted to selectively short respective ones of the plurality of microbolometers in the microbolometer array.