Infrared Detection Device Thermal Management via Heat-Conducting Layer
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Solution Overview
Problem
Infrared detecting devices face an increase in dark current due to heat generated by signal processing circuits, which is transferred to the semiconductor substrate, affecting the infrared detecting element's performance.
Innovation Solution
The infrared detecting device incorporates a heat-conducting layer with higher conductivity than insulating layers on the signal processing board, positioned to surround the element placement area, effectively increasing the distance between signal processing circuits and the infrared detecting element, thereby reducing temperature gradients and dark current variations among pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal processing circuits are placed in an area opposing the semiconductor substrate, then signal processing efficiency is improved, but heat is transferred to the infrared detecting element causing dark current increase
Solution Approach 1:
The signal processing board is divided into two distinct areas: an element placement area for the infrared detecting element and a circuit placement area for signal processing circuits. This spatial segmentation separates the heat-generating circuits from the sensitive detecting element, allowing efficient signal processing while preventing heat transfer that would cause dark current increase.
2Object-affected harmful factors
If signal processing circuits are placed far from the infrared detecting element, then dark current increase is suppressed, but signal processing efficiency decreases
Solution Approach 1:
The patent transitions from a one-dimensional vertical stacking arrangement (circuits directly below the element) to a two-dimensional planar separation (element placement area and circuit placement area as distinct zones). This dimensional change allows circuits to be positioned in the surrounding area rather than directly beneath, reducing thermal coupling while maintaining electrical connectivity for efficient signal processing.
3Stability of the object's composition
If heat-conducting layer is added to the signal processing board, then temperature gradient is reduced, but device complexity increases
Solution Approach 1:
A heat-conducting layer is introduced as an intermediary component between the circuit placement area and the element placement area. This layer acts as a thermal mediator that conducts heat away from the circuits while preventing direct thermal coupling with the infrared detecting element, thereby reducing temperature gradients without requiring complete redesign of the board architecture.
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 configuration suppresses the increase in dark current, ensuring more accurate infrared detection by minimizing the impact of heat from signal processing circuits on the infrared detecting element, leading to improved performance and reduced variation among pixels.
Implementation Method 1
The heat-conducting layer has a heat conductivity that is higher than a heat conductivity of the plurality of insulating layers
Data Source
AI summary
The signal processing board includes a plurality of signal processing circuits configured to process signals output from a plurality of pixels of an infrared detecting element. The signal processing board includes an element placement area where the infrared detecting element is placed, and a circuit placement area positioned outside the element placement area to surround the element placement area when viewed from a direction orthogonal to the signal processing board. The signal processing board includes a plurality of insulating layers that are stacked on a surface side opposing the semiconductor substrate. A plurality of signal processing circuits are placed in the circuit placement area. A heat-conducting layer is placed to be positioned on at least one of the insulating layers and in the element placement area, in the signal processing board. The heat-conducting layer has a heat conductivity that is higher than a heat conductivity of the insulating layers.