CN107389203B - A pixel reading circuit, an array reading circuit and a pixel reading method - Google Patents

Abstract

The invention provides a pixel reading circuit, an array reading circuit and a pixel reading method. The pixel reading circuit includes a first control module, a second control module and a photosensitive module; A threshold voltage or the like outputs a voltage signal to the second control module; the second control module controls the on and off of the photosensitive module and the first control module according to the second enable signal; the first control module outputs the photosensitive module according to the first enable signal signal; when the pixel reading circuit provided by this application is used for array image reading, the working row and the non-working row can be selected by the first enable signal and the second enable signal, and the setting of the second control module avoids the non-working row When the photosensitive module is turned on, the photosensitive signal output by the working line is pulled high or low, so all pixel reading circuits can share an analog scanning signal, reducing the number of analog signal sources, which can simplify the design of the analog front end, while reducing the cost.

Description

A pixel reading circuit, an array reading circuit and a pixel reading method

technical field

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

The technology of obtaining corresponding images according to the distribution of light intensity has been 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 distinguished by human vision. And can further calculate the temperature distribution of the object. Infrared imaging technology enables humans to transcend visual barriers, so that people can see the temperature distribution on the surface of objects. The process of converting the acquired optical signal into an image needs to be completed by a pixel reading circuit.

At present, the widely used pixel reading circuit includes a photosensitive transistor and a transistor. As shown in Figure 1, the gate of the photosensitive transistor 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, and the The source is also connected to the DC power supply voltage DC through a resistor, the gate of the transistor is connected to the enable signal terminal Mn, and the drain of the transistor is the signal output terminal Nn; when the pixel reading circuit of this structure is used for array image reading, each The scanning signals of a pixel row must be controlled individually to avoid mutual interference between the pixel rows, which leads to a complicated design of the analog front end of the reading circuit and high cost.

SUMMARY OF THE INVENTION

The present invention provides a pixel reading circuit, an array reading circuit and a pixel reading method, so as to simplify the analog front-end design of the reading circuit and reduce the cost.

In order to solve the above problems, the present invention discloses a pixel reading circuit, the pixel reading circuit includes a first control module, a second control module and a photosensitive module;

The first control module is respectively connected to the first enable signal input terminal, the first node and the voltage signal output terminal, the first node is connected to the first voltage signal input terminal, and the first control module is used for according to the first enable signal. outputting a voltage signal to the voltage signal output terminal by the energy signal and the voltage of the first node;

The second control module is respectively connected to the second enable signal input terminal, the photosensitive module and the first node, and is used to control the conduction between the photosensitive module and the first control module according to the second enable signal disconnected from;

The photosensitive module is respectively connected to a scan signal input end and a second voltage signal input end, and is used for outputting a voltage signal to the second control module according to the scan signal, the first threshold voltage and the second voltage signal; the first threshold voltage Changes with the size of the photosensitive amount;

Wherein, the first enable signal and the second enable signal are used to control the first control module and the second control module to be turned on or off at the same time;

During the reading process, the first control module and the second control module are turned on at the same time;

the scanning signal varies within a preset range;

When the scanning signal is greater than the first threshold voltage, the photosensitive module is turned on, and the voltage signal output terminal outputs a first photosensitive voltage signal;

When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module is turned off, and the voltage signal output terminal outputs a second photosensitive voltage signal.

Preferably, the first control module includes a first transistor, the second control module includes a second transistor, and the photosensitive module includes a photosensitive transistor;

The first transistor includes a first control electrode, a first electrode and a second electrode; the first control electrode is connected to the first enable signal input terminal, the first electrode is connected to the first node, and the The second electrode is connected to the voltage signal output terminal;

The second transistor includes a second control electrode, a third electrode and a fourth electrode; the second control electrode is connected to the second enable signal input terminal, the third electrode is connected to the photosensitive module, and the third electrode is connected to the photosensitive module. Four electrodes are connected to the first node;

The photosensitive transistor includes a third control electrode, a fifth electrode and a sixth electrode; the third control electrode is connected to the scan signal input end, the fifth electrode is connected to the second voltage signal input end, and the first Six electrodes are connected to the third electrode of the second transistor.

Preferably, the channel types of the first transistor and the second transistor are the same, and the first enable signal and the second enable signal are the same.

Preferably, the first voltage signal is a high potential, and the second voltage signal is a ground potential.

Preferably, the first voltage signal is a ground potential, and the second voltage signal is a high potential.

Preferably, the pixel reading circuit further includes a resistor, and the first node is connected to the first voltage signal input terminal through the resistor.

Preferably, the scanning signal varies within a preset range, including:

The scanning signal is a signal from high to low within a preset range above and below the dark state threshold voltage; the dark state threshold voltage is the threshold voltage of the photosensitive module when the photosensitive amount is zero.

Preferably, the scanning signal varies within a preset range, including:

The scanning signal is a signal from low to high within a preset range above and below the dark state threshold voltage; the dark state threshold voltage is the threshold voltage of the photosensitive module when the photosensitive amount is zero.

In order to solve the above problems, the present invention also discloses an array reading circuit, the array reading circuit includes a plurality of the pixel reading circuits described in any one of the above, and the plurality of the pixel reading circuits are arranged in an array;

The scanning signal input terminals of the pixel reading circuits in each row are connected to the total scanning signal input terminal;

The first voltage signals input by the first voltage signal input terminals of the pixel reading circuits in each row are the same;

The second voltage signals input by the second voltage signal input terminals of the pixel reading circuits in each row are the same;

The first enable signal input terminal and the second enable signal input terminal of the pixel reading circuit in each row are connected to the row enable signal input terminal;

The voltage signal output terminal of the pixel reading circuit in each column is connected to the column voltage signal output terminal.

In order to solve the above problems, the present invention also discloses a pixel reading method, which is applied to any of the above pixel reading circuits, and the method includes:

In the reading phase, the first enable signal and the second enable signal are controlled to enable the first control module and the second control module to be turned on at the same time;

controlling the scanning signal to vary within a preset range;

When the scanning signal is greater than the first threshold voltage, the photosensitive module is turned on, and the voltage signal output terminal outputs a first photosensitive voltage signal;

When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module is turned off, and the voltage signal output terminal outputs a second photosensitive voltage signal.

Compared with the prior art, the present invention has the following advantages:

An embodiment of the present application provides a pixel reading circuit, including a first control module, a second control module and a photosensitive module; the photosensitive module sends a second control module to the second control module according to a scan signal, a first threshold voltage and a second voltage signal that vary with the photosensitive amount The module outputs a voltage signal; the second control module controls the on and off of the photosensitive module and the first control module according to the second enable signal; the first control module outputs the photosensitive signal which changes with the scanning signal according to the first enable signal; When the pixel reading circuit provided by the application is used for array image reading, the working row and the non-working row can be selected by the first enable signal and the second enable signal, and the setting of the second control module avoids the photosensitive module of the non-working row. When turned on, the photosensitive signal output by the working row is pulled high or low, so the scanning signal input terminals of each row of pixel reading circuits can be connected to a total scanning signal input terminal, that is, all pixel reading circuits can share an analog scanning signal , reducing the number of analog signal sources, which can simplify the design of the analog front end, while reducing costs.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

1 is a schematic structural diagram of a pixel reading circuit in the prior art;

2 is a schematic structural diagram of a pixel reading circuit provided in Embodiment 1 of the present application;

3 is a schematic structural diagram of a pixel reading circuit provided in Embodiment 2 of the present application;

4 is a schematic structural diagram of an array reading circuit provided in Embodiment 3 of the present application;

5 is a signal control timing diagram of an array reading circuit provided in Embodiment 3 of the present application;

FIG. 6 is a flowchart of steps of a pixel reading method provided in Embodiment 4 of the present application.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to FIG. 2 , a schematic structural diagram of a pixel reading circuit provided in Embodiment 1 is shown. The pixel reading circuit includes: a first control module 01 , a second control module 02 and a photosensitive module 03 .

The first control module 01 is respectively connected to the first enable signal input end 04, the first node 05 and the voltage signal output end 07, the first node 05 is connected to the first voltage signal input end 06, and the first control module 01 is used for according to the first The enable signal and the voltage of the first node 05 output a voltage signal to the voltage signal output terminal 07 .

The second control module 02 is respectively connected to the second enable signal input terminal 08, the photosensitive module 03 and the first node 05, and is used to control the on and off between the photosensitive module 03 and the first control module 01 according to the second enable signal open.

The photosensitive module 03 is respectively connected to the scanning signal input terminal 09 and the second voltage signal input terminal 10, and is used for outputting a voltage signal to the second control module 02 according to the scanning signal, the first threshold voltage and the second voltage signal; size changes.

Specifically, there are various structural forms that can implement the functions of the first control module 01 or the second control module 02 , for example, a P-type or N-type transistor, or a combined structure of several transistors. In practical applications, by controlling the first enable signal and the second enable signal, the first control module 01 and the second control module 02 are turned on or off at the same time. The specific structure can be determined according to the actual application, which is not limited in this application.

The structure of the photosensitive module 03 can also be various, for example, it can be a photosensitive transistor, or a photodiode or other element that can be converted into an electrical signal according to the amount of photosensitive.

In practical applications, the first voltage signal and the second voltage signal may be specifically set according to the requirements of the voltage output signal, for example, the first voltage signal may be a high potential, and the second voltage signal may be a ground potential. In another implementation manner, the first voltage signal may also be a ground potential, and the second voltage signal may be a high potential.

The scan signal input by the scan signal input terminal 09 varies within a preset range. For example, the scan signal can be a signal from high to low within a preset range above and below the dark state threshold voltage; the dark state threshold voltage is when the light-sensing amount is zero. , the threshold voltage of the photosensitive module. In another implementation manner, the scan signal may also be a signal ranging from low to high within a preset range above and below the dark state threshold voltage.

During the reading process, the first control module 01 and the second control module 02 are turned on at the same time.

When the scanning signal is greater than the first threshold voltage, the photosensitive module 03 is turned on, and the voltage signal output terminal 07 outputs the first photosensitive voltage signal;

When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module 03 is turned off, and the voltage signal output terminal 07 outputs a second photosensitive voltage signal.

In another implementation manner, the pixel reading circuit may further include a resistor, and the first node 05 is connected to the first voltage signal input end 06 through the resistor, where the resistor plays a role of shunt.

This embodiment provides a pixel reading circuit, which includes a first control module, a second control module and a photosensitive module; the photosensitive module sends the second control module to the second control module according to a scan signal, a first threshold voltage and a second voltage signal that vary with the photosensitive amount. outputting a voltage signal; the second control module controls the on and off of the photosensitive module and the first control module according to the second enable signal; the first control module outputs the photosensitive signal which changes with the scanning signal according to the first enable signal; the present application When the provided pixel reading circuit is used for array image reading, the working row and the non-working row can be selected by the first enable signal and the second enable signal, and the setting of the second control module prevents the photosensitive module of the non-working row from being turned on. When the photosensitive signal output by the working row is pulled high or low, the scanning signal input terminal of each row of pixel reading circuits can be connected to a total scanning signal input terminal, that is, all pixel reading circuits can share an analog scanning signal. The number of analog signal sources is reduced, which simplifies the design of the analog front end while reducing cost.

Embodiment 2

Referring to FIG. 3 , a schematic structural diagram of a pixel reading circuit provided by the second embodiment is shown. The pixel reading circuit includes a first transistor 001 , a second transistor 002 and a photosensitive transistor 003 .

The first transistor 001 includes a first control electrode, a first electrode and a second electrode; the first control electrode is connected to the first enable signal input terminal 04, the first electrode is connected to the first node 05, and the first node 05 is connected to the first node 05 through a resistor The voltage signal input terminal 06, the second electrode is connected to the voltage signal output terminal 07.

The second transistor 002 includes a second control electrode, a third electrode and a fourth electrode; the second control electrode is connected to the second enable signal input terminal 08 , the third electrode is connected to the photosensitive transistor 003 , and the fourth electrode is connected to the first node 05 .

The photosensitive transistor 003 includes a third control electrode, a fifth electrode and a sixth electrode; the third control electrode is connected to the scan signal input end 09 , the fifth electrode is connected to the second voltage signal input end 10 , and the sixth electrode is connected to the first electrode of the second transistor 002 . Three electrodes.

In this embodiment, the photosensitive transistor 003 is a quantum dot oxide thin film transistor QD-TFT as an example. Since the QD-TFT will cause a shift in threshold voltage after being illuminated, the maximum shift amount can reach 4-8V. Assuming that the dark state threshold voltage of the n-type QD-TFT is Vth, a negative drift a occurs under a certain amount of light, wherein different amounts of light correspond to different values of a, so the first threshold voltage after illumination is Vth-a.

In practical applications, by controlling the first enable signal and the second enable signal, the first transistor 001 and the second transistor 002 are turned on or off at the same time. In a preferred embodiment of this embodiment, the channel types of the first transistor 001 and the second transistor 002 may be the same, and the first enable signal and the second enable signal may be two voltage signals controlled separately, or may be Two identical voltage signals or share the same voltage signal. When the two are the same voltage signal or share the same voltage signal, the voltage signal needs to be higher than the threshold voltage of the first transistor 001 and the second transistor 002 at the same time in the turn-on stage, and needs to be lower than the first transistor 001 and the second transistor 002 at the same time in the turn-off stage. Threshold voltage of the second transistor 002 . Optionally, the threshold voltages of the first transistor 001 and the second transistor 002 are the same.

In this embodiment, the first voltage signal is at a high potential, and the second voltage signal is at a ground potential. The scanning signal is a sawtooth wave from high to low within a preset range above and below the dark state threshold voltage.

The following describes the reading process in conjunction with the pixel reading circuit provided in this embodiment:

During the reading process, the first enable signal and the second enable signal are controlled so that the first transistor 001 and the second transistor 002 are turned on at the same time.

Since the scan signal is a sawtooth wave from high to low within a preset range above and below the dark state threshold voltage, when the scan signal is greater than the first threshold voltage Vth-a, the photosensitive transistor 003 is turned on, because the fifth electrode of the photosensitive transistor is connected to The second voltage signal input terminal 10 is at ground potential, so the potential of the voltage signal output terminal 07 is pulled down by the photosensitive transistor, that is, the first photosensitive voltage signal is output.

As the voltage of the scan signal gradually decreases, when the scan signal is less than or equal to the first threshold voltage Vth-a, the photosensitive transistor 003 is turned off, and the potential output by the voltage signal output terminal 07 is no longer connected to the photosensitive transistor 003. The ground potential is only connected to the first voltage signal input terminal 06 through a resistor, and the first voltage signal is at a high potential, so the voltage signal output terminal 07 outputs a high potential, that is, the second photosensitive voltage signal.

In this embodiment, the setting of the second transistor prevents the photosensitive signal output by the working row from being pulled high or low when the photosensitive module of the non-working row is turned on, so the scanning signal input terminals of the pixel reading circuits of each row can be connected to each other. To a total scan signal input terminal, that is, all pixel readout circuits can share one analog scan signal, reducing the number of analog signal sources, thereby simplifying the design of the analog front end and reducing costs.

Embodiment 3

Referring to FIG. 4 , a schematic structural diagram of an array reading circuit provided in the third embodiment is shown. The array reading circuit includes a plurality of pixel reading circuits as in any of the above-mentioned embodiments, and a plurality of pixel reading circuits. Array arrangement.

The scan signal input terminals of the pixel reading circuits in each row are connected to the total scan signal input terminal S.

The first voltage signals input to the first voltage signal input terminals of the pixel reading circuits in each row are the same.

The second voltage signals input to the second voltage signal input terminals of the pixel reading circuits in each row are the same.

The first enable signal input terminal and the second enable signal input terminal of the pixel reading circuit in each row are connected to the row enable signal input terminals M1 , M2 . . . Mn.

The voltage signal output terminals of the pixel readout circuits in each column are connected to the column voltage signal output terminals N1, N2 . . . Nn.

In this embodiment, the total scan signal S is a sawtooth wave from high to low within a preset range above and below the dark state threshold voltage, the first voltage signal is a high potential V, and the second voltage signal is a ground potential.

In practical applications, when the first line starts to work, M1 turns on the other two transistors except the photosensitive transistor. The signal control timing diagram is shown in Figure 5, SYNC is the line synchronization signal, and CLK is the clock signal. At this time, since the scan signal is a sawtooth wave from high to low, for a pixel whose scan signal or gate voltage is greater than the first threshold voltage, the potential output by the corresponding voltage output terminal is pulled down through the photosensitive transistor. As the voltage of the scan signal gradually decreases, the gate voltages of the photosensitive transistors in some pixels in the first row drop below the first threshold voltage, so that the photosensitive transistors are turned off, and finally the potential output by the voltage output terminals of these pixels is no longer Connected to ground through the phototransistor, but pulled high through a resistor.

Since the light-sensing amounts of different pixels are different, the threshold voltage shift amount a of each light-sensing transistor is also different. As the scanning voltage increases from high to low, the photosensitive transistors in each pixel are turned off at different times, that is, the duration of the high potential output by the voltage signal output terminal is different. According to the duration of the high potential output by each pixel, the photosensitive amount of each pixel can be read.

In the array reading circuit provided in this embodiment, when a row of pixels is working, the enable signals of other rows are all low, so that all the first transistors and the second transistors in other rows are turned off. The first transistor prevents the voltage signal output terminal from being connected to the ground potential or the high potential through the inactive row. The second transistor prevents the output signal of the working row from being pulled high or low when the photosensitive transistor of the non-working row is turned on. The first transistor and the second transistor play the role of isolating the working row from the non-working row, so that each row can share the same scanning signal, which avoids the need for an independent scanning signal for each row, and simplifies the design of the analog front end.

Embodiment 4

Referring to FIG. 6 , a pixel reading method provided in the fourth embodiment is shown, which is applied to the pixel reading circuit in any of the above-mentioned embodiments, and the pixel reading method includes:

Step 401 : in the reading phase, the first enable signal and the second enable signal are controlled to enable the first control module and the second control module to be turned on at the same time.

Step 402: Control the scan signal to vary within a preset range.

Step 403: When the scanning signal is greater than the first threshold voltage, the photosensitive module is turned on, and the voltage signal output terminal outputs the first photosensitive voltage signal.

Step 404: When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module is turned off, and the voltage signal output terminal outputs a second photosensitive voltage signal.

In practical applications, taking an n-type QD-TFT device as an example, assuming the dark-state threshold voltage Vth, a negative-direction drift a occurs after illumination, and different photosensitive amounts correspond to different a values, so the first threshold voltage after illumination is Vth-a.

First, the correction is performed in a dark state environment. The input voltage of the scan signal input terminal is VH, where VH is greater than the dark state threshold voltage Vth, and the voltage signal output terminal is at a low potential at this time; the input voltage of the scan signal input terminal gradually decreases. When it is less than Vth, the voltage signal at the output terminal of the voltage signal jumps from a low potential to a high potential, and the scanning voltage value corresponding to the transition point, that is, the dark state threshold voltage Vth, is recorded.

During the image reading process, the initial voltage of the input terminal of the scan signal is VH (greater than Vth), and the output potential of the voltage signal output terminal is low at this time; the voltage of the input terminal of the scan signal gradually decreases, and when the input voltage is less than Vth-a, the The potential output by the voltage signal output terminal changes from a low potential to a high potential, and the scanning voltage value corresponding to the trip point, that is, the first threshold voltage Vth-a, is recorded.

According to the first threshold voltage Vth-a and the dark state threshold voltage Vth, the lower threshold shift a of the corresponding photosensitive amount can be calculated, and the photosensitive amount can be calculated according to the threshold shift amount, and then the gray value corresponding to the corresponding pixel can be calculated.

In the array reading circuit, the gray value of each pixel can be calculated according to the above method of the pixel reading circuit, and the relative gray value can be calculated according to the difference in the duration of the high potential of the voltage signal output by each pixel reading circuit. degree value, and then read the image.

An embodiment of the present application provides a pixel reading circuit, including a first control module, a second control module and a photosensitive module; the photosensitive module sends a second control module to the second control module according to a scan signal, a first threshold voltage and a second voltage signal that vary with the photosensitive amount The module outputs a voltage signal; the second control module controls the on and off of the photosensitive module and the first control module according to the second enable signal; the first control module outputs the photosensitive signal which changes with the scanning signal according to the first enable signal; When the pixel reading circuit provided by the application is used for array image reading, the working row and the non-working row can be selected by the first enable signal and the second enable signal, and the setting of the second control module avoids the photosensitive module of the non-working row. When turned on, the photosensitive signal output by the working row is pulled high or low, so the scanning signal input terminals of each row of pixel reading circuits can be connected to a total scanning signal input terminal, that is, all pixel reading circuits can share an analog scanning signal. , reducing the number of analog signal sources, which can simplify the design of the analog front end, while reducing costs.

For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, Certain steps may be performed in other orders or simultaneously.

Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article of manufacture or device comprising a list of elements includes not only those elements, but also those not expressly listed or other elements inherent to such a process, method, commodity or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture or device that includes the element.

A pixel reading circuit, an array reading circuit and a pixel reading method provided by the present invention have been described in detail above. Specific examples are used in this paper to illustrate the principles and implementations of the present invention. The description is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. , the contents of this specification should not be construed as limiting the invention.

Claims (10)

1. A pixel reading circuit, characterized in that the pixel reading circuit comprises a first control module, a second control module and a photosensitive module; The first control module is respectively connected to the first enable signal input terminal, the first node and the voltage signal output terminal, the first node is connected to the first voltage signal input terminal, and the first control module is used for according to the first enable signal. outputting a voltage signal to the voltage signal output terminal by the energy signal and the voltage of the first node; The second control module is respectively connected to the second enable signal input terminal, the photosensitive module and the first node, and is used to control the conduction between the photosensitive module and the first control module according to the second enable signal disconnected from; The photosensitive module is respectively connected to a scan signal input end and a second voltage signal input end, and is used for outputting a voltage signal to the second control module according to the scan signal, the first threshold voltage and the second voltage signal; the first threshold voltage Changes with the size of the photosensitive amount; Wherein, the first enable signal and the second enable signal are used to control the first control module and the second control module to be turned on or off at the same time; During the reading process, the first control module and the second control module are turned on at the same time; the scanning signal varies within a preset range; When the scanning signal is greater than the first threshold voltage, the photosensitive module is turned on, and the voltage signal output terminal outputs a first photosensitive voltage signal; When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module is turned off, and the voltage signal output terminal outputs a second photosensitive voltage signal. 2. The pixel reading circuit according to claim 1, wherein the first control module comprises a first transistor, the second control module comprises a second transistor, and the photosensitive module comprises a photosensitive transistor; The first transistor includes a first control electrode, a first electrode and a second electrode; the first control electrode is connected to the first enable signal input terminal, the first electrode is connected to the first node, and the The second electrode is connected to the voltage signal output terminal; The second transistor includes a second control electrode, a third electrode and a fourth electrode; the second control electrode is connected to the second enable signal input terminal, the third electrode is connected to the photosensitive module, and the third electrode is connected to the photosensitive module. Four electrodes are connected to the first node; The photosensitive transistor includes a third control electrode, a fifth electrode and a sixth electrode; the third control electrode is connected to the scan signal input end, the fifth electrode is connected to the second voltage signal input end, and the first Six electrodes are connected to the third electrode of the second transistor. 3 . The pixel reading circuit according to claim 2 , wherein the channel types of the first transistor and the second transistor are the same, and the first enable signal and the second enable signal are of the same channel type. 4 . same. 4 . The pixel reading circuit of claim 1 , wherein the first voltage signal is a high potential, and the second voltage signal is a ground potential. 5 . 5 . The pixel reading circuit of claim 1 , wherein the first voltage signal is a ground potential, and the second voltage signal is a high potential. 6 . 6 . The pixel reading circuit according to claim 1 , wherein the pixel reading circuit further comprises a resistor, and the first node is connected to the first voltage signal input terminal through the resistor. 7 . 7. The pixel reading circuit according to any one of claims 1 to 6, wherein the scan signal varies within a preset range, comprising: The scanning signal is a signal from high to low within a preset range above and below the dark state threshold voltage; the dark state threshold voltage is the threshold voltage of the photosensitive module when the photosensitive amount is zero. 8. The pixel reading circuit according to any one of claims 1 to 6, wherein the scan signal varies within a preset range, comprising: The scanning signal is a signal from low to high within a preset range above and below the dark state threshold voltage; the dark state threshold voltage is the threshold voltage of the photosensitive module when the photosensitive amount is zero. 9 . An array reading circuit, characterized in that the array reading circuit comprises a plurality of pixel reading circuits according to any one of claims 1 to 8 , and a plurality of the pixel reading circuits are arranged in an array ; The scanning signal input terminals of the pixel reading circuits in each row are connected to the total scanning signal input terminal; The first voltage signals input by the first voltage signal input terminals of the pixel reading circuits in each row are the same; The second voltage signals input by the second voltage signal input terminals of the pixel reading circuits in each row are the same; The first enable signal input terminal and the second enable signal input terminal of the pixel reading circuit in each row are connected to the row enable signal input terminal; The voltage signal output terminal of the pixel reading circuit in each column is connected to the column voltage signal output terminal. 10. A pixel reading method, applied to the pixel reading circuit according to any one of claims 1 to 8, wherein the method comprises: In the reading phase, the first enable signal and the second enable signal are controlled to enable the first control module and the second control module to be turned on at the same time; controlling the scanning signal to vary within a preset range; When the scanning signal is greater than the first threshold voltage, the photosensitive module is turned on, and the voltage signal output terminal outputs a first photosensitive voltage signal; When the scanning signal is less than or equal to the first threshold voltage, the photosensitive module is turned off, and the voltage signal output terminal outputs a second photosensitive voltage signal.