Pixel circuit and driving method thereof as well as X-ray detector

A circuit and pixel technology, used in X/γ/cosmic radiation measurement, radiation measurement, instruments, etc., can solve the problems of weak photocurrent, poor image quality, and inability to form a signal-to-noise ratio.

Active Publication Date: 2018-06-26
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the photocurrent itself is weak, it cannot form

Method used

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  • Pixel circuit and driving method thereof as well as X-ray detector
  • Pixel circuit and driving method thereof as well as X-ray detector
  • Pixel circuit and driving method thereof as well as X-ray detector

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[0041] The specific implementation of the pixel circuit, its driving method, and the X-ray detector provided by the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments described in this specification are only a part of the embodiments of the present invention, rather than all of the embodiments; and in the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other; In addition, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0042] A pixel circuit provided by the present invention, such as figure 1 As shown, it includes: an initialization module 101, a photodiode PIN, a photodiode control module 102, an output module 103, and an output control module 104;...

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Abstract

The invention discloses a pixel circuit and a driving circuit thereof as well as an X-ray detector. The pixel circuit comprises an initialization module, an output module, an output control module, aphotodiode and a photodiode control module. In the technical scheme of the invention, photocurrent generated by the photodiode is used as a control signal under the condition that the output control module is conducted; on the one hand, the output module is controlled to be conducted; on the other hand, current values, outputted by the conducted output control module and the conducted output module, of a first power supply signal end are adjusted, i.e., current which is finally outputted by the pixel circuit is jointly determined by the photocurrent generated by the photodiode and the first power supply signal end rather than direct output of the photocurrent generated by the photodiode, so that the power output capability of the pixel circuit is improved, further the signal-noise-ratio isimproved and the image quality is improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a picture element circuit, its driving method and an X-ray detector. Background technique [0002] X-ray detectors are widely used in industrial non-destructive testing, container scanning, circuit board inspection, medical treatment, security and other fields, and have broad application prospects. According to the working principle, it can be divided into direct conversion type (Direct DR) and indirect conversion type (Indirect DR). Among them, the indirect conversion X-ray detector has become the mainstream of the market due to its relatively mature technology, relatively low cost, high Detective Quantum Efficiency (DQE), and good reliability. [0003] At present, the pixel circuit of the indirect conversion X-ray detector mainly includes a thin film transistor (Thin Film Transistor, TFT) and a photodiode. Under X-ray irradiation, the scintillator layer or phosphor layer con...

Claims

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Application Information

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IPC IPC(8): G01T1/00
CPCG01T1/00
Inventor 方浩博林坚米磊张勇包智颖白璐王景棚张丽敏薛艳娜华刚
Owner BOE TECH GRP CO LTD
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