Semiconductor Pixel Layout for Stable Point-Source Tracking
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Solution Overview
Problem
Conventional semiconductor detectors experience significant signal variations when imaging small objects, leading to difficulties in tracking and detection due to artificial signal attenuation and amplification, especially when point-like sources move across pixels, which affects subsequent image processing algorithms.
Innovation Solution
The geometric layout of the photosensitive region in semiconductor detectors is adapted to reduce signal variations by optimizing the shape and arrangement of pixels, minimizing differences in signal fluctuations when a point source moves between adjacent and second-nearest neighbor lattice positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional rectangular lattice pixels with separate photosensitive regions are used, then the detector can capture light signals, but significant signal variations occur when point sources move between pixels, reducing tracking precision
Solution Approach 1:
The pixel surface is divided into multiple photosensitive sub-regions (e.g., four quadrants) instead of a single photosensitive area. Each sub-region is independently sensitive to light, allowing the detector to capture point sources more consistently regardless of their position within the pixel, thereby reducing signal variations during tracking.
Solution Approach 2:
Multiple photosensitive sub-regions within each pixel are combined to form an integrated photosensitive surface that covers the entire pixel area. This merging eliminates the non-sensitive gaps between separate photosensitive regions, ensuring continuous signal detection as point sources move across the detector surface.
2Adaptability or versatility
If the photosensitive area is reduced to adjust sensitivity, then the sensitivity can be tuned, but the fill factor decreases and non-active area increases
Solution Approach 1:
The pixel surface is segmented into multiple photosensitive sub-regions that collectively cover the entire pixel area. This segmentation allows the detector to maintain a high fill factor (100% photosensitive coverage) while still providing sensitivity adjustment capabilities through the geometric arrangement and readout configuration of the sub-regions.
Solution Approach 2:
The entire pixel surface serves as photosensitive area, eliminating the need for separate active and non-active regions. The multi-functional design allows the same surface to provide both maximum light capture (high fill factor) and sensitivity adjustment through configurable readout patterns from different sub-regions.
3Productivity
If point sources move between adjacent pixels, then the detector can track moving objects, but artificial signal attenuation and amplification occur affecting image processing
Solution Approach 1:
By dividing each pixel into multiple photosensitive sub-regions, the detector creates a more continuous photosensitive surface that reduces abrupt signal changes when point sources move between pixels. This segmentation ensures that point sources are consistently detected across pixel boundaries, stabilizing the signal composition for image processing.
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 adaptation results in reduced signal variation amplitude and improved sensitivity, enabling better detection and tracking of small objects, particularly in missile warning devices, by stabilizing the signal-to-noise ratio and enhancing image processing efficiency.
Implementation Method 1
Each pixel 10a, 10b, 10c, 10d comprises, respectively, a photosensitive region 13a, 13b, 13d, 13d
Data Source
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AI summary
A semiconductor detector for tracking of point-like sources (20) comprises a plurality of pixels (10). The pixels (10) are arranged in a rectangular lattice. Each pixel (10) has a surface with a photosensitive region (13) for detecting light. The photosensitive region (13) has a geometric layout adapted to reduce a signal variation if the point source (20) moves from a first pixel (10a) to a second pixel (10b, 10d), wherein the second pixel (10b, 10d) is located at an adjacent lattice position with respect to the first pixel (10a).