Terahertz Detection Pixel Signal Integration Circuit
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Solution Overview
Problem
Existing terahertz wave detection devices cannot fully utilize detected signals from unselected rows in a two-dimensional-array detection element, leading to incomplete signal acquisition during row-by-row reading.
Innovation Solution
A detection device with pixels arranged in N rows and M columns, each equipped with a detector, a first capacitor, a first switch, and a second switch, where the switches are operated to integrate and store detection signals by repeatedly turning them ON and OFF, allowing signal integration during periods when the pixel is not selected for reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If row-by-row reading is performed to an N-row by M-column two-dimensional-array detection element, then reading can be performed sequentially, but it is impossible to acquire a terahertz wave detection signal from a row which is not selected to be subjected to the reading
Solution Approach 1:
The patent applies preliminary action by performing integration operations on detection signals during periods when pixels are not being read out. The integration circuit accumulates signals from unselected rows before they would otherwise be lost, preparing the signals in advance for subsequent processing and display.
Solution Approach 2:
The integration circuit serves multiple functions: it integrates signals from unselected rows, stores accumulated signals, and enables these signals to be displayed together with signals from selected rows. This multi-functional approach allows the system to simultaneously handle both selected and unselected row signals without requiring separate processing paths.
2Measurement precision
If integration operation is performed to integrate detection signals, then signal-to-noise ratio is improved, but device complexity increases due to additional capacitors and switches
Solution Approach 1:
The patent segments the integration function into distinct operational phases controlled by multiple switches. The first switch controls charging of the first capacitor during signal integration, while the second switch controls transfer to the second capacitor for storage. This segmentation allows precise control over when integration occurs and when signals are prepared for readout, reducing unwanted noise accumulation.
Solution Approach 2:
The integration operation is performed periodically during specific time windows when pixel rows are not being read out. By utilizing these idle periods for integration activities, the system improves signal quality without extending the overall readout time or requiring continuous operation of integration circuits, thereby managing complexity effectively.
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 enables the integration and storage of terahertz wave detection signals across all pixels, reducing low-frequency noise and improving the signal-to-noise ratio by averaging fluctuations, thereby enhancing imaging quality.
Implementation Method 1
each of the pixels including: a detector configured to detect an electromagnetic wave
Implementation Method 2
a first capacitor connected to the detector; a first switch and a second switch each connected to a terminal of the first capacitor opposite to the detector; and a second capacitor connected to a terminal of the second switch opposite to the first capacitor
Data Source
AI summary
A detection device with pixels arranged in N rows and M columns where N and M are each an integer of one or more, each of the pixels including: a detector configured to detect an electromagnetic wave; a first capacitor connected to the detector; a first switch and a second switch each connected to a terminal of the first capacitor opposite to the detector; and a second capacitor connected to a terminal of the second switch opposite to the first capacitor, wherein each of a terminal of the first switch opposite to the first capacitor and a terminal of the second capacitor opposite to the second switch is connected to a reference potential, and wherein an integration operation of turning ON/OFF the first switch and then turning ON/OFF the second switch while maintaining the first switch in an OFF state is repeatedly performed a plurality of times.