Pixel reading circuit, array reading circuit and pixel reading method

Abstract

The invention provides pixel reading circuits, an array reading circuit and a pixel reading method; the pixel reading circuit comprises a first control module, a second control module and photographic modules; the photographic module outputs a voltage signal to the second control module according to a scanning signal and a first threshold-voltage changing with photographic quantities; the second control module controls the photographic module to connect with / disconnect from the first control module according to a second enabling signal; the first control module outputs a photographic signal according to a first enabling signal. The pixel reading circuit can use the first and second enabling signals to select a working line and a non-working line in an array image reading process; the second control module is arranged so as to prevent a working line outputted photographic signal from being pulled up or down when a non-working line photographic module is open; all pixel reading circuits can share one simulation scanning signal, thus reducing simulation signal source quantity, simplifying the simulation front end designs, and reducing cost.

Description

technical field [0001] The invention relates to the technical field of photodetection, in particular to a pixel reading circuit, an array reading circuit and a pixel reading method. Background technique [0002] The technology of obtaining corresponding images according to the distribution of light intensity is applied to many devices. For example, infrared imagers use photoelectric detection technology to detect infrared band signals of thermal radiation of objects, and convert the signals into images and graphics that can be visually distinguished by humans. And can further calculate the temperature distribution of the object. Infrared imaging technology enables human beings to transcend visual barriers, so that people can see the temperature distribution on the surface of objects. Among them, the process of converting the acquired light signal into an image needs to be completed by the pixel reading circuit. [0003] The currently widely used pixel reading circuit inclu...

AI Technical Summary

Problems solved by technology

[0003] The currently widely used pixel reading circuit includes a photosensitive transistor and a transistor, such as figure 1 As shown, the gate of the phototransistor is connected to the scanning signal terminal Sn, the source is connected to the ground potential, the drain is connected to the source of the transistor, the source of the transistor is also connected to a DC power supply voltage DC through a resistor, and the gate of the transistor is connected to the enable signal Terminal Mn, the drain of the transistor is the signal output terminal Nn; when the pixel reading circuit with this structure is used for array image reading, the scanning signal of each pixel row must be controlled separately to avoid mutual interference between pixel rows, which The analog front-end design of the read circuit is complicated and expensive

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