KR101966916B1 - Sensor pixel, fingerprint and image sensor, and driving method thereof - Google Patents

Abstract

Provided are a sensor pixel with limitless driving speed, a fingerprint and image sensor having the same, and a driving method thereof. To this end, the fingerprint and image sensor comprises: a plurality of data lines extended in a first direction and arranged in a second direction; a reset voltage generation circuit for generating a reset voltage according to the amount of external light; a sensor panel including a plurality of sensor pixels reset by the reset voltage and generating a pixel voltage according to supplied light; and a sensing reading circuit receiving the pixel voltage through a corresponding data line among the plurality of data lines and generating an output voltage based on the pixel voltage and a reference voltage.

Description

TECHNICAL FIELD [0001] The present invention relates to a sensor pixel, a fingerprint and image sensor including the sensor pixel,

The present disclosure relates to an optical sensor pixel, a fingerprint and image sensor including the same, and a driving method thereof.

Optical fingerprint and image sensors are affected by the amount of light at the location of the sensor because they recognize the object based on the amount of light received by the sensor. When the fingerprint and image sensor operate in an environment with a large amount of light, there is a problem that it is difficult to accurately recognize an object due to the influence of ambient light.

In order to solve such a problem, circuits (global shutter, rolling shutter, etc.) for electrically intercepting signals when a light amount is large using a shutter in a pixel have been developed. However, image distortion occurs due to the shutoff circuits using the shutter, and the driving speed of the fingerprint and image sensor is limited.

The present invention provides a sensor pixel having no limitation in a driving speed, a fingerprint and an image sensor including the sensor pixel, and a driving method thereof, which solve the problem that the fingerprint and the image are not recognized due to the influence of the light amount of the surrounding environment.

According to an aspect of the present invention, there is provided a fingerprint and image sensor including a plurality of data lines extending in a first direction and arranged in a second direction, a reset voltage generating circuit for generating a reset voltage in accordance with an external light amount, And a plurality of sensor pixels for generating a pixel voltage in accordance with the supplied light, and a sensor panel for receiving the pixel voltage through a corresponding one of the plurality of data lines and outputting the pixel voltage based on the pixel voltage and the reference voltage And a sensing reading circuit for generating a voltage.

Each of the plurality of sensor pixels includes a reset transistor for supplying the reset voltage to the first contact in a first period, a photodiode connected between the first contact and the bias voltage, a capacitive capacitor connected in parallel to the photodiode, And a switching transistor for transmitting a pixel voltage, which is a voltage of the first contact, to a corresponding data line in a second period.

The sensor panel includes a reset voltage line connected to one end of the reset transistor for supplying the reset voltage and a reset gate line connected to a gate of the reset transistor for transmitting a reset scan signal for controlling a switching operation of the reset transistor. And the other end of the reset transistor may be connected to the first contact.

The sensor panel may further include a scan line connected to a gate of the switching transistor, wherein one end of the switching transistor is connected to the data line, and the other end of the switching transistor is connected to the first contact have.

Wherein the sensing reading circuit includes a multiplexing circuit for multiplexing a plurality of pixel voltages supplied through the plurality of data lines and transferring a plurality of data voltages to a predetermined number of channels, And an amplification circuit for generating a plurality of output voltages.

The sensing readout circuit may further include a signal processing circuit for generating a video signal based on the plurality of output voltages and an address corresponding to each of the plurality of output voltages.

The multiplexing circuit may include a plurality of switches including one end connected to each of the n data lines among the plurality of data lines and the other end connected to the amplifying circuit and performing a switching operation in accordance with the corresponding switching signal .

The amplifying circuit includes an operational amplifier including a first input connected to the other end of the plurality of switches, a second input for receiving the reference voltage, and an output terminal, and an operational amplifier connected between the first input and the output And a capacitor for integrating the current flowing from the first input terminal to generate a corresponding output voltage.

The amplifying circuit may further include a reset switch connected in parallel to the capacitor and turned on during a period between on periods of the plurality of switches.

According to another aspect of the present invention, a sensor pixel generates a pixel voltage according to supplied light, and includes a photodiode connected between a first contact and a bias voltage, a capacitive capacitor connected in parallel to the photodiode, And a switching transistor for transferring a pixel voltage, which is a voltage of the first contact, to the data line according to a scan signal, and the reset voltage may be changed according to an external light amount

After the reset transistor is turned on and the voltage of the first contact is reset to the reset voltage, the pixel voltage may be determined according to light supplied to the photodiode.

According to still another aspect of the present invention, there is provided a method of driving a fingerprint and an image sensor including a plurality of sensor pixels, including the steps of generating a reset voltage in accordance with an external light amount, supplying a reset voltage to all of the plurality of sensor pixels, Generating a plurality of pixel voltages in accordance with the light supplied by the sensor pixels of the plurality of pixel voltages, transferring the plurality of pixel voltages to the plurality of data lines, and outputting the plurality of output voltages based on the plurality of pixel voltages and the reference voltages .

The generating of the plurality of output voltages may include multiplexing the plurality of pixel voltages, and integrating the currents input from the data lines corresponding to the pixel voltages input in accordance with the multiplexing to generate the plurality of output voltages Step < / RTI >

Provided are a sensor pixel, a fingerprint and an image sensor including the sensor pixel, and a driving method thereof, which can recognize fingerprints and images without influence of the light quantity of the surrounding environment.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of a fingerprint and image sensor according to an embodiment. Fig.
2 is a diagram showing a part of a plurality of sensor pixels, a multiplexing circuit, and an amplifying circuit according to the embodiment.
3 is a waveform diagram showing a reset scan signal and a scan signal.
4 is a waveform diagram showing a switching signal and a reset signal.
5 is a waveform diagram showing a pixel voltage according to a change of a reset voltage according to a light amount.
6 is a graph showing the relationship between the illuminance and the tone value of the fingerprint and the image sensor according to the variation of the reset voltage according to the embodiment.

The fingerprint sensor and the image sensor according to the embodiment can adapt to the environment according to the change of light and can be used without any influence on the light quantity of the surrounding environment. To this end, the operating area of the fingerprint and image sensor can be adjusted according to the intensity of the light. The fingerprint and image sensor may be subjected to a pixel reset voltage that varies the operating area of the sensor according to the amount of light. Specifically, the pixel reset voltage is varied according to the light amount, the range of the pixel voltage corresponding to the detected light amount is adjusted, the voltage difference between the reference voltage for signal processing and the pixel voltage is adjusted, do.

Hereinafter, embodiments will be described in detail with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of a fingerprint and image sensor according to an embodiment. Fig.

1, the sensor 1 includes a sensor panel 10, a gate driving circuit 20, a sensing reading circuit 30, a reset voltage generating circuit 40, a photo sensing circuit 50, a bias voltage A generating circuit 60, and a light source 70.

The sensor panel 10 is provided with a plurality of gate lines S1 to S11, a plurality of reset gate lines SR1 to SR11, a plurality of data lines D1 to D16 and reset voltage lines RE and RE1 to RE16, do. Although not shown in Fig. 1, a line to which the bias voltage VB is supplied may also be located in the sensor panel 10. [ In FIG. 1, the sensor panel 10 is shown as having a 16X11 size, but this is not limitative.

The plurality of gate lines S1 to S11 extend in a first direction (horizontal direction in FIG. 1) and are arranged in a second direction (vertical direction in FIG. 1) that intersects the first direction. A scan signal corresponding to each of the plurality of sensor pixel rows is transmitted through the plurality of gate lines (S1-S11).

The plurality of reset gate lines SR1 to SR11 extend in the first direction (horizontal direction in FIG. 1), are arranged along the second direction, and are located in parallel with the corresponding gate lines. A reset scan signal corresponding to each of the plurality of sensor pixel rows is transferred through the plurality of reset gate lines SR1 to SR11.

The plurality of data lines D1 to D16 extend in the second direction and are arranged along the first direction. The pixel voltages of the plurality of sensor pixels are transmitted to the sensing reading circuit 30 through the plurality of data lines D1 to D16.

Each of the plurality of sensor pixels PX is connected to a corresponding gate line, a reset gate line, and a data line, and the pixel voltage is reset in synchronization with the reset scan signal transmitted through the corresponding reset gate line, The pixel voltage can be transferred to the corresponding data line in synchronization with the scan signal transmitted through the line.

The sensor panel 10 is provided with a reset voltage line RE extending in the first direction and a reset voltage line RE1-RE16 extending in the second direction from the reset voltage line RE and corresponding to a plurality of sensor pixel columns . The reset voltage lines RE and RE1 to RE16 shown in FIG. 1 are illustrative, and the invention is not limited thereto.

The gate driving circuit 20 sequentially generates a plurality of scan signals and supplies the generated scan signals to the plurality of gate lines S1 to S11 to generate and supply the reset scan signals to the plurality of reset gate lines SR1 to SR11.

In the embodiment, all the sensor pixels PX are reset to the reset voltage VRS in synchronization with the reset scan signal of the on level in the sensor panel 10, and a plurality of scan signals Can be supplied.

The sensing reading circuit 30 generates a plurality of output voltages by amplifying the voltage difference between each of the plurality of pixel voltages supplied from the plurality of data lines D1-D16 and the reference voltage, and outputs the sensed fingerprint Or an image can be generated as a video signal.

The sensing reading circuit 30 includes a multiplexing circuit 31, an amplifying circuit 32, and a signal processing circuit 33.

The multiplexing circuit 31 can generate a plurality of data voltages VD1 to VD4 by multiplexing a plurality of pixel voltages supplied through the plurality of data lines D1 to D16 at a ratio of 4: 1. In the embodiment, the multiplexing circuit 31 is implemented as a 4: 1 MUX, but the present invention is not limited thereto. The multiplexing circuit 31 includes a plurality of switches each having one end connected to each of the plurality of data lines D1 to D16. A plurality of switches can be grouped into four units to form one channel. In FIG. 1, since the number of the plurality of data lines is 16, four channels are formed through the 4: 1 MUX. The data voltages VD1 to VD4 are transmitted to the amplifying circuit 32 through each of the four channels.

The amplifying circuit 32 amplifies the voltage difference between each of the data voltages VD1 to VD4 and the reference voltage to generate an output voltage VO1 to VO4 and transfers it to the signal processing circuit 33. [

The signal processing circuit 33 can generate a video signal representing the fingerprint or image sensed based on the addresses corresponding to the output voltages VO1-VO4 and the output voltages VO1-VO4, respectively.

The signal processing circuit 33 can generate the switching signals MS1 to MS4 for controlling the switches of the multiplexing circuit 31 and generate the reset signals AS1 to AS4 for resetting the output of the amplifying circuit 32 . The signal processing circuit 33 can recognize the position of the sensor pixel row to which the scan signal of the on level is synchronized at the time when each of the plurality of scan signals becomes on level and controls the switching operation of the multiplexing circuit 31 The position of the sensor pixel column input through each channel can be known. Therefore, the address of the sensor pixel corresponding to the output voltage VO1-VO4 supplied from the amplifier circuit 32 can be known.

In the case of optical fingerprint recognition, the signal processing circuit 33 can generate a video signal representing a fingerprint or image sensed based on the addresses corresponding to the output voltages VO1-VO4 and the output voltages VO1-VO4, respectively .

 The light sensing circuit 50 senses the light quantity of the environment in which the fingerprint and image sensor 1 are located and transmits a light sensing signal LS indicating the information on the light quantity to the reset voltage generating circuit 40.

The reset voltage generating circuit 40 determines the level of the reset voltage VRS based on the photo sensing signal LS and generates and supplies the reset voltage VRS to the reset voltage line RE. For example, the reset voltage generating circuit 40 may increase the reset voltage VRS as the light amount increases, and decrease the reset voltage VRS as the light amount decreases. However, in this case, the reset voltage VRS can be reduced to the reference voltage.

The bias voltage generating circuit 60 generates and supplies the bias voltage VB to the sensor panel 10 and a bias voltage VB is supplied to each of the plurality of sensor pixels PX through the bias voltage line.

Light source 70 provides the optical fingerprint and light necessary for image sensing. The light source 70 may be positioned on the rear surface of the sensor panel 10 to provide light to the front surface.

2 is a diagram showing a part of a plurality of sensor pixels, a multiplexing circuit, and an amplifying circuit according to the embodiment.

In Fig. 2, four sensor pixels PX1-PX4 of the first sensor pixel row, four switches M1-M4 connected to the four data lines D1-D4 in the multiplexing circuit 31, One operational amplifier 321 connected to the channel corresponding to the four data lines D1 to D4 is shown. Those skilled in the art will recognize the overall configuration based on some of the configurations shown in FIG.

Each of the sensor pixels PX1 to PX4 is connected to one of the corresponding data lines D1 to D4, one of the corresponding reset voltage lines RE1 to RE4, one of the corresponding bias voltage lines VB1 to VB4, S1), and the reset gate line SR1.

Each of the sensor pixels PX1-PX4 includes switching transistors T2, T4, T6 and T8 which are switched by a scan signal S [1], reset transistors T1, T3 and T4 which are switched by a reset scan signal SR, T5 and T7, photodiodes PD1 to PD4, and capacitors C1 to C4. The connection relationship between the switching transistor, the reset transistor, the photodiode, and the capacitors in each of the sensor pixels PX1 to PX4 is the same, and only the sensor pixel PX1 will be described.

The reset transistor T1 includes a gate electrode connected to the reset gate line SR1, one electrode connected to the reset voltage line RE1, and another electrode connected to the contact point NP. The switching transistor T2 includes a gate electrode connected to the gate line S1, one electrode connected to the data line D1, and another electrode connected to the contact point NP. The photodiode PD1 includes an anode electrode connected to the bias voltage line VB1 and a cathode electrode connected to the contact NP. The capacitor C1 includes one electrode connected to the bias voltage line VB1 and the other electrode connected to the contact NP. Hereinafter, the voltage of the contact point NP is referred to as a pixel voltage VPX.

A capacitance is formed between each of the data lines D1-D4 and another adjacent electrode (not shown), and the capacitance is shown as data line capacitors DCP1-DCP4 in Fig. The data line capacitors DCP1 to DCP4 are electrically connected to the data lines D1 to D4, respectively.

In the multiplexing circuit 31, the switch M1 includes one electrode connected to the data line D1, another electrode connected to the channel CH1, and a gate electrode supplied with the switching signal MS1, The switch M2 includes one electrode connected to the data line D2, another electrode connected to the channel CH1 and a gate electrode supplied with the switching signal MS2, One electrode connected to the data line D3 and the other electrode connected to the channel CH1 and a gate electrode supplied with the switching signal MS3 and the switch M4 is connected to the data line D4 One electrode connected to the channel CH1, and a gate electrode supplied with the switching signal MS4.

In the amplifying circuit 32, the operational amplifier 321 includes a non-inverting terminal (+) to which the reference voltage VRE is input, an inverting terminal (-) to which the data voltage VD1 is input via the channel CH1, And an output terminal to which the voltage VO1 is output. A feedback capacitor CFB1 is connected between the inverting terminal (-) and the output terminal of the operational amplifier 321 and the reset switch SW1 is connected in parallel to the feedback capacitor CFB1. The reset switch SW1 can be switched by the reset signal AS1.

When the reset switch SW1 of the operational amplifier 321 is turned on, the output values of the channel CH1 and the operational amplifier 321 between the switches M1, M2, M3, and M4 and the operational amplifier 321 become the reference voltage VRE). A current flows from the sensor pixel PX1 to the channel CH1 after the reset and during the ON period of the switch M1 and the introduced current is integrated by the capacitor CA1 of the operational amplifier 321. [ Then, the output voltage VO1 is generated in the capacitor CA1 as a voltage based on the integration result. At this time, the capacitance of the capacitor CA1 and the output voltage VO1 are in inverse proportion. The output voltage VO1 decreases as the capacitance of the capacitor CA1 increases and the output voltage VO1 decreases as the capacitance of the capacitor CA1 decreases as the capacitance of the capacitor CA1 increases, even if the amount of charge flowing from the sensor pixel PX1 to the channel CH1 is the same. Increases.

Hereinafter, the operation of the fingerprint and image sensor according to the embodiment will be described with reference to FIGS. 3 and 4. FIG.

3 is a waveform diagram showing a reset scan signal and a scan signal. 4 is a waveform diagram showing a switching signal and a reset signal.

As shown in FIG. 3, during the period P0 from the time point T0, the reset scan signal SR is at the ON level, and the reset transistors of all the sensor pixels PX are turned on. Then, the pixel voltage VPX of the mode sensor pixel PX becomes the reset voltage.

Next, on-level scan signals S [1] to S [11] are sequentially supplied from the gate line S1 to the gate line S11. For example, the scan signal S [1] is at a high level, which is an on level during a period P1 from the time point T1, and then a high level, which is an on level during the period P2 from the time point T2, , And the scan signal S [11] becomes the high level which is the ON level during the period P3 from the time T3. The on-level periods of the scan signals S [1] -S [11] may be the same.

At time T4, the reset scan signal SR becomes a high level which is an on level, and the subsequent operations are the same as described above.

After the reset period P0, the light supplied from the light source 70 can be reflected to the recognition object and recognized by the sensor pixel PX. For example, when the fingerprint is recognized, the ridge of the fingerprint is closely adhered to the sensor panel 1, and the amount of light reflected from the light source 70 to the sensor pixel PX is large. In the case of a valley, the amount of light reflected from the light source 70 to the sensor pixel PX is relatively small due to the space between the sensor fingerprint valley and the sensor panel 1.

A current flows to the photodiode (PD1 to PD4 in Fig. 2) according to the amount of light incident on each of the sensor pixels PX. At this time, the direction of the current flowing in the photodiode is in the direction of the anode from the cathode, and the charge of the capacitor (C1-C4 in FIG. 2) is discharged by the current flowing in the photodiode. Then, the degree of discharge of the capacitor is changed according to the amount of light incident on each of the sensor pixels PX, and the pixel voltage VPX is determined according to the amount of light. For example, as the light amount increases, the pixel voltage VPX may be lowered.

The pixel voltage (VPX1-VPX4 in Fig. 2) is transferred to the multiplexing circuit 31 via the data lines D1-D16 during the ON level periods of the scan signals S [1] -S [11] (31) multiplexes the pixel voltages transferred from the corresponding data lines and outputs them as data voltages (VD1-VD4). At this time, the data line capacitors (DCP1 to DCP4 in Fig. 2) can maintain the pixel voltage transmitted through the data lines.

As shown in FIG. 4, during the ON level period P1 of the scan signal S [1], the switching signals MS1-MS4 may be sequentially turned on to a high level.

First, during a period P9 in the period T9-T10, the reset signal AS1 becomes a high level which is an on level, the reset switch SW1 is turned on, and the output voltage VO1 can be reset to the reference voltage VRE.

During the period T11-T12, the switching signal MS1 is at the high level, the switch M1 is turned on, the current flows from the sensor pixel PX1 through the data line D1, 321 by the capacitor CA1 to generate the output voltage VO1. During the period T13-T14, the switching signal MS2 becomes high level, the switch M2 is turned on, the current flows from the sensor pixel PX2 through the data line D2, 321 by the capacitor CA1 to generate the output voltage VO1. During the period T15-T16, the switching signal MS3 becomes high level, the switch M3 is turned on, the current flows from the sensor pixel PX3 through the data line D3, 321 by the capacitor CA1 to generate the output voltage VO1. During the period T17-T18, the switching signal MS4 becomes high level, the switch M4 is turned on, the current flows from the sensor pixel PX4 through the data line D4, 321 by the capacitor CA1 to generate the output voltage VO1.

During a period P4, the reset signal AS1 becomes a high level at the ON level and the reset switch SW1 is turned on in the periods T12 to T13, the periods T14 to T15, and the periods T14 to T15, respectively, And can be reset to the reference voltage VRE. The on level period of the reset signal AS1 may be constant in the period P4.

5 is a waveform diagram showing a pixel voltage according to a change of a reset voltage according to a light amount.

In Fig. 5, the pixel voltage VPX1 of the sensor pixel PX1 is shown. The pixel voltages of the other pixel circuits can have the same waveform, and a description thereof will be omitted.

As shown in FIG. 5, the reset voltage generating circuit 40 may set the reset voltage VRS based on the photo sensing signal LS.

For example, when the light sensing signal LS indicates a predetermined threshold light amount value or less, the reset voltage generating circuit 40 may set the reset voltage VRS to the reference voltage VRE.

Then, when the pixel voltage (for example, VPX1) is maintained at the reset voltage VRS before the time point T31 and light is supplied from the light source 70 after the time point T31, the current flowing through the photodiode PD1 causes the pixel The voltage VPX1 can be determined. As the amount of light reflected by the sensor pixel (for example, PX1) increases, the pixel voltage VPX1 decreases.

When the switching transistor T2 and the switch M1 are turned on after the time point T31, current flows from the sensor pixel PX1, and the introduced current is integrated by the capacitor CA1 of the operational amplifier 321, An output voltage VO1 is generated. The output voltage VO1 is saturated with the power supply voltage of the operational amplifier 321 and the output voltage VO1 corresponding to the data voltage VD1 is not generated when the data voltage VD1 is larger than the reference voltage VRE. Therefore, the output voltage VO1 can be generated after the time point T31 when the data voltage VD1 has decreased to the reference voltage VRE.

Alternatively, when the photo sensing signal LS indicates an arbitrary first level higher than a predetermined threshold light amount value, the reset voltage generating circuit 40 outputs the reset voltage VRS to the reset voltage VRE higher than the reference voltage VRE VRS1).

5, when the pixel voltage VPX1 is maintained at the reset voltage VRS1 before the time point T31 and light is supplied from the light source 70 after the time point T31, The pixel voltage VPX1 can be determined by the current. Since the switching transistor T2 and the switch M1 are turned on after the time point T31 and the current flowing from the sensor pixel PX1 from the time point T32 when the data voltage VD1 has decreased to the reference voltage VRE is supplied to the operational amplifier 321, so that the output voltage VO1 can be generated.

As another example, when the light sensing signal LS indicates an arbitrary second level (> first level) of a predetermined threshold light amount value or more, the reset voltage generating circuit 40 generates the reset voltage VRS to the reset voltage VRS1) higher than the reset voltage VRS2.

5, when the pixel voltage VPX1 is maintained at the reset voltage VRS2 before the time point T31 and light is supplied from the light source 70 after the time point T31, The pixel voltage VPX1 can be determined by the current. Since the switching transistor T2 and the switch M1 are turned on after the time point T31 and the current flowing from the sensor pixel PX1 has not been supplied to the operational amplifier Px1 since the time point T33 when the data voltage VD1 has decreased to the reference voltage VRE 321, so that the output voltage VO1 can be generated.

As shown in FIG. 5, as the light supplied to the sensor pixel PX1 increases, the pixel voltage VPX1 may decrease and decrease to the bias voltage VB.

6 is a graph showing the relationship between the illuminance and the tone value of the fingerprint and the image sensor according to the variation of the reset voltage according to the embodiment.

As shown in FIG. 6, when the reset voltage VRS is varied to 0.5 V, 1 V, 1.5 V, 2 V, 2.5 V, 3 V, and 3.3 V, Is shifted. The illuminance is a light intensity of the light supplied to the sensor pixel, and the gray level value may mean a video signal generated by the signal processing circuit 33 on the basis of the output voltage VO1-VO4.

The sensitivity of the fingerprint and image sensor 1 depends on the slope of the illuminance-tone value curve, and it can be seen that only the operating region is shifted without a change in sensitivity, as seen in FIG.

By increasing the value of the reset voltage VRS as the light amount of the external environment is increased, the operation area of the fingerprint and image sensor 1 can be increased as compared with the conventional art.

For example, it is assumed that the illuminance of the external environment is 400 lux, and the external light amount is directly supplied to the sensor pixel PX1. In this case, when the reset voltage VRS is 0.5 V, the operation range of the fingerprint and image sensor 1 is in a range of approximately 230 to 250 gradation values. As the reset voltage VRS is increased, the operation region of the fingerprint and image sensor 1 is increased, and when the reset voltage VRS is 3.3 V, the operation region is in the range of about 40 to 250 tone values.

As described above, the embodiment can provide the effect of securing the operation area without changing the sensitivity of the fingerprint and image sensor by setting the reset voltage according to the external light quantity.

1: Sensor
10: Sensor panel
20: Gate driving circuit
30: sensing reading circuit
40: reset voltage generation circuit
50: Light sensing circuit
60: bias voltage generating circuit
70: Light source

Claims (13)

A plurality of data lines extending in a first direction and arranged in a second direction;
A reset voltage generating circuit for generating a reset voltage in accordance with an external light amount;
A sensor panel including a plurality of sensor pixels for generating a pixel voltage in accordance with light that is reset and supplied by the reset voltage; And
And a sensing read circuit receiving the pixel voltage through a corresponding one of the plurality of data lines and generating an output voltage based on the pixel voltage and the reference voltage,
The sensing read circuit comprising:
A multiplexing circuit for multiplexing a plurality of pixel voltages supplied through the plurality of data lines and transmitting a plurality of data voltages to a predetermined number of channels; And
And an amplifying circuit for integrating the currents input from the plurality of data lines to generate a plurality of output voltages,
Wherein the multiplexing circuit comprises:
And a plurality of switches including one end connected to each of the n data lines among the plurality of data lines and the other end connected to the amplifying circuit and switching according to a corresponding switching signal,
Fingerprint and image sensor. The method according to claim 1,
Wherein each of the plurality of sensor pixels comprises:
A reset transistor for supplying the reset voltage to the first contact in a first period;
A photodiode coupled between the first contact and a bias voltage;
A capacitive capacitor connected in parallel to the photodiode; And
And a switching transistor for transferring a pixel voltage, which is the voltage of the first contact, to a corresponding data line in a second period. 3. The method of claim 2,
In the sensor panel,
A reset voltage line connected to one end of the reset transistor for supplying the reset voltage; And
And a reset gate line connected to a gate of the reset transistor for transmitting a reset scan signal for controlling a switching operation of the reset transistor,
And the other end of the reset transistor is connected to the first contact. 3. The method of claim 2,
In the sensor panel,
And a scan line coupled to a gate of the switching transistor,
Wherein one end of the switching transistor is connected to the data line and the other end of the switching transistor is connected to the first contact. delete The method according to claim 1,
The sensing read circuit comprising:
And a signal processing circuit for generating a video signal based on the plurality of output voltages and an address corresponding to each of the plurality of output voltages. delete The method according to claim 1,
Wherein the amplifying circuit comprises:
An operational amplifier including a first input connected to the other end of the plurality of switches, a second input receiving the reference voltage, and an output; And
And a capacitor coupled between the first input terminal and the output terminal, the capacitor integrating a current input from the first input terminal to generate a corresponding output voltage. 9. The method of claim 8,
Wherein the amplifying circuit comprises:
And a reset switch connected in parallel to the capacitor and turned on during a period between on periods of the plurality of switches.

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