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Pixel Architecture for Imaging Devices

An imaging device and pixel technology, applied in image communication, radiation measurement, color TV parts, etc., can solve the problem of complex use of continuous photodiodes

Inactive Publication Date: 2019-06-14
VAREX IMAGING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This effect complicates the use of continuous photodiodes, which are increasingly being adopted in imaging devices

Method used

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  • Pixel Architecture for Imaging Devices
  • Pixel Architecture for Imaging Devices
  • Pixel Architecture for Imaging Devices

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Embodiment Construction

[0022] Various embodiments of pixel architectures for imaging devices and methods are described. It is to be understood that this disclosure is not limited to particular embodiments described, as such may, of course, vary. Aspects described in connection with a particular embodiment are not necessarily limited to that embodiment, and may be practiced in any other embodiment. Various embodiments are presented using NMOS transistors in circuits. It should be understood that a circuit with PMOS transistors can be fully functional with appropriate changes in the polarity of the reference voltage. Further, it should be understood that the pixel architecture described in this disclosure can be implemented in both scintillator-based and photoconductor-based X-ray imaging devices and optical imaging devices. Pixel architectures can be implemented in both TFT flat panel imagers and CMOS imagers.

[0023] All technical and scientific terms used herein have the meaning as commonly und...

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Abstract

An imaging device includes a plurality of detector pixels. Each detector pixel includes a detector element configured to generate a first signal in response to an x-ray photon incident thereon, a current mirror configured to generate a second signal representative of the first signal, and a current mirror configured to allow a second A switching transistor for passing the second signal and / or the first signal out of the detector pixel.

Description

technical field [0001] Embodiments of the present disclosure relate to imaging devices and methods. In particular, various embodiments of pixel architectures for imaging devices are described. Background technique [0002] exist figure 1 with figure 2 In the conventional pixel architecture of a digital imager shown in , a photodiode 12 produces a photocurrent proportional to the light generated from x-ray exposure. The current is integrated across the parasitic capacitor 14 . The accumulated charge is transferred to the charge amplifier 16 via the switching transistor 18 through the data line 20 . The amplifier 16 converts the charge into a corresponding voltage using a conversion factor according to the capacitance of the capacitor 22 . Many rows of photodiodes can be read by the same set of amplifiers by successively selecting switching transistors. However, using a common data line for multiple pixels would increase the parasitic capacitance at the input of the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/3745H04N5/374
CPCG01T1/20184
Inventor I·莫洛维
Owner VAREX IMAGING CORP