KR102603691B1 - Fingerprint sensing subpixel, driving circuit and display device - Google Patents

Abstract

Embodiments of the present invention relate to a fingerprint sensing subpixel, a driving circuit, and a display device, wherein a fingerprint sensing subpixel composed of a sensing transistor, a sensing capacitor, and an optical sensor is disposed in an active area of a display panel, and whether or not the optical sensor is exposed to light is determined. By sensing the voltage fluctuations, the ridges and valleys of the fingerprint touched on the display panel can be analyzed and the fingerprint can be sensed. In this way, by enabling fingerprint sensing in the active area of the display panel, it is possible to provide a display device implementing a fingerprint sensing function that prevents a decrease in the active area due to the placement of the fingerprint sensor and improves user convenience.

Description

Fingerprint sensing subpixel, driving circuit and display device {FINGERPRINT SENSING SUBPIXEL, DRIVING CIRCUIT AND DISPLAY DEVICE}

Embodiments of the present invention relate to a fingerprint sensing subpixel, a driving circuit, and a display device.

As the information society develops, various demands for display devices that display images are increasing, including liquid crystal display devices, plasma display devices, and organic light emitting display devices. ), etc., various types of display devices are being used.

In order to provide more diverse functions to users, these display devices provide various functions, such as a function to recognize the user's touch on the display panel and perform input processing, in addition to the basic function of displaying images through the display panel.

Additionally, in order to provide an input processing function using the user's biometric information, the display device provides a function to recognize the user's biometric information such as the user's fingerprint, iris, or face and perform input processing.

A method of recognizing the user's fingerprint among the user's biometric information is, for example, placing a fingerprint sensor on the front of the display panel in an area where no image is displayed (non-active area) or on the side or back of the display device and There is a method to recognize the user's fingerprint that has been touched.

Here, the structure in which the fingerprint sensor is placed on the side or rear of the display device causes the fingerprint sensor to be placed in a position that is difficult to see from the user, which poses a problem of deteriorating user convenience.

In addition, the structure of arranging the fingerprint sensor in the non-active area of the display panel has a problem in that as the non-active area increases due to the fingerprint sensor, the area where the image is displayed (active area) becomes relatively narrow.

Therefore, there is a need for a method that can improve user convenience and provide a fingerprint sensing function in the structure of a display device that seeks to maximize the active area and minimize the non-active area.

The purpose of embodiments of the present invention is to provide a structure that can sense a user's fingerprint touched on an active area where an image is displayed on a display panel, a circuit that drives fingerprint sensing, and a display device.

The purpose of embodiments of the present invention is to provide a structure that allows fingerprint sensing to be performed in the active area of a display panel without reducing the display driving period, and a circuit and display device for driving fingerprint sensing.

In one aspect, embodiments of the present invention include a display panel on which a plurality of gate lines, a plurality of data lines, and a plurality of subpixels are arranged, and an image using at least one first subpixel among the plurality of subpixels. A display device including a driving circuit that displays and senses a fingerprint using one or more second subpixels among a plurality of subpixels is provided.

In such a display device, a light emitting diode and a driving transistor that drives the light emitting diode may be disposed in the first subpixel.

And, in the second subpixel, a sensing line, a reference voltage line, and a sensing scan line are disposed, and a fingerprint sensor electrically connected between the sensing line and the reference voltage line is disposed, and the fingerprint sensor is connected to the first node and the second node. and a sensing transistor having a third node, a sensing capacitor, and an optical sensor, wherein a first node of the sensing transistor may be electrically connected to a sensing line and a second node of the sensing transistor may be electrically connected to a sensing scan line.

In another aspect, embodiments of the present invention have a sensing line, a sensing scan line crossing the sensing line, a reference voltage line crossing the sensing scan line, and a first node, a second node, and a third node. Node 1 is electrically connected to the sensing line, and the second node is a sensing transistor electrically connected to the sensing scan line, a sensing capacitor electrically connected between the third node of the sensing transistor and the reference voltage line, and the first node of the sensing transistor. It provides a fingerprint sensing subpixel including an optical sensor electrically connected between and a third node.

In another aspect, embodiments of the present invention have a sensing line, a sensing scan line crossing the sensing line, a reference voltage line crossing the sensing scan line, and a first node, a second node, and a third node. One node is electrically connected to the sensing line, and the second node is a sensing transistor electrically connected to the sensing scan line, an optical sensor electrically connected between the third node of the sensing transistor and the reference voltage line, and a second node in parallel with the optical sensor. A fingerprint sensing subpixel including a connected sensing capacitor is provided.

In another aspect, embodiments of the present invention output a sensing driving voltage through a sensing line in a first period of the fingerprint sensing period and output a sensing reference voltage through a sensing line or reference voltage line in a second period of the fingerprint sensing period. A driving circuit is provided including a voltage output unit and a fingerprint sensing unit that senses voltage through a sensing line during a third period of the fingerprint sensing period and senses the fingerprint based on the sensed voltage.

According to embodiments of the present invention, by disposing a fingerprint sensor using an optical sensor in the active area of the display panel, the user's fingerprint touched on the active area of the display panel can be sensed.

According to embodiments of the present invention, some of the voltage lines arranged in the subpixels of the display panel are used as sensing lines for fingerprint sensing, so that the fingerprint sensing function can be implemented while minimizing the wiring added to the display panel. do.

According to embodiments of the present invention, by configuring a separate sensing line for fingerprint sensing on the display panel, display driving and fingerprint sensing can be performed simultaneously, so that fingerprint sensing can be performed without reducing the display driving period. do.

According to embodiments of the present invention, by detecting a sensing signal from a fingerprint touch on a sub-pixel basis on the display panel, it is possible to decompose the ridges and valleys of the fingerprint, thereby allowing the user to identify the user in the active area of the display panel. Enables fingerprint recognition.

1 is a diagram showing the schematic configuration of a display device according to embodiments of the present invention.
FIG. 2 is a diagram illustrating an example of a circuit structure of subpixels arranged in a display panel of a display device according to embodiments of the present invention.
FIG. 3 is a diagram illustrating a schematic example of a structure in which fingerprint sensing subpixels are arranged on a display panel of a display device according to embodiments of the present invention.
FIGS. 4A and 4B are diagrams showing examples of the circuit structure of the fingerprint sensing subpixel shown in FIG. 3.
FIG. 5 is a diagram illustrating the principle of sensing a fingerprint using an optical sensor disposed in a fingerprint sensing subpixel according to embodiments of the present invention.
FIGS. 6 to 9 are diagrams showing examples of how the fingerprint sensing subpixel (type 1) shown in FIG. 4A operates during the fingerprint sensing period.
Figures 10 to 13 are diagrams showing examples of how the fingerprint sensing subpixel (type 2) shown in Figure 4b operates during the fingerprint sensing period.
FIG. 14 is a diagram illustrating another example of a schematic structure in which fingerprint sensing subpixels are arranged on a display panel of a display device according to embodiments of the present invention.
FIG. 15 is a diagram showing an example of the circuit structure of the fingerprint sensing subpixel shown in FIG. 14.
FIG. 16 is a diagram illustrating an example of the driving timing of the fingerprint sensing subpixel shown in FIG. 15.
Figure 17 is a diagram showing an example of the schematic configuration of a driving circuit for sensing a fingerprint in a display device according to embodiments of the present invention.
Figure 18 is a diagram illustrating an example of a process of a fingerprint sensing method of a display device according to embodiments of the present invention.
Figure 19 is a diagram showing the effect of the fingerprint sensing function provided by the display device according to embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

Additionally, when describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the essence, sequence, order, or number of the components are not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there are no other components between each component. It should be understood that may be “interposed” or that each component may be “connected,” “combined,” or “connected” through other components.

Figure 1 shows a schematic configuration of a display device 100 according to embodiments of the present invention.

Referring to FIG. 1, the display device 100 according to embodiments of the present invention includes a display panel 110 in which a plurality of subpixels (SP) including light-emitting elements are arranged, and driving the display panel 110. It may include a gate driving circuit 120, a data driving circuit 130, and a controller 140.

In the display panel 110, a plurality of gate lines (GL) and a plurality of data lines (DL) are arranged, and a subpixel (SP) is arranged in an area where the gate line (GL) and the data line (DL) intersect. . Each of these subpixels (SP) may include a light emitting element, and two or more subpixels (SP) may constitute one pixel.

The gate driving circuit 120 is controlled by the controller 140 and sequentially outputs scan signals to the plurality of gate lines GL disposed on the display panel 110 to determine the driving timing of the plurality of subpixels SP. control.

The gate driving circuit 120 may include one or more gate driver integrated circuits (GDIC, Gate Driver Integrated Circuit) and may be located on only one side or both sides of the display panel 110 depending on the driving method. It may be possible.

The data driving circuit 130 receives image data from the controller 140 and converts the image data into an analog data voltage. Then, the data voltage is output to each data line (DL) in accordance with the timing when the scan signal is applied through the gate line (GL), so that each subpixel (SP) expresses brightness according to the image data.

The data driving circuit 130 may include one or more source driver integrated circuits (SDIC).

The controller 140 supplies various control signals to the gate driving circuit 120 and the data driving circuit 130, and controls the operations of the gate driving circuit 120 and the data driving circuit 130.

The controller 140 causes the gate driving circuit 120 to output a scan signal according to the timing implemented in each frame, and converts the externally received image data to fit the data signal format used by the data driving circuit 130. The converted image data is output to the data driving circuit 130.

The controller 140 sends various timing signals including a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input data enable signal (DE, Data Enable), and a clock signal (CLK) along with the image data to an external device. Receive from (e.g. host system).

The controller 140 may generate various control signals using various timing signals received from the outside and output them to the gate driving circuit 120 and the data driving circuit 130.

As an example, the controller 140 uses a gate start pulse (GSP, Gate Start Pulse), a gate shift clock (GSC), and a gate output enable signal (GOE, Outputs various gate control signals including Gate Output Enable).

Here, the gate start pulse (GSP) controls the operation start timing of one or more gate driver integrated circuits constituting the gate driving circuit 120. The gate shift clock (GSC) is a clock signal commonly input to one or more gate driver integrated circuits, and controls the shift timing of the scan signal. The gate output enable signal (GOE) specifies timing information for one or more gate driver integrated circuits.

In addition, the controller 140 uses a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE) to control the data driving circuit 130. Outputs various data control signals, including Output Enable.

Here, the source start pulse (SSP) controls the data sampling start timing of one or more source driver integrated circuits constituting the data driving circuit 130. The source sampling clock (SSC) is a clock signal that controls the sampling timing of data in each source driver integrated circuit. The source output enable signal (SOE) controls the output timing of the data driving circuit 130.

This display device 100 supplies various voltages or currents to the display panel 110, the gate driving circuit 120, the data driving circuit 130, etc., or has a power management integrated circuit that controls the various voltages or currents to be supplied. More may be included.

In the display panel 110, in addition to the gate line (GL) and data line (DL), voltage lines to which various signals or voltages may be supplied may be disposed, and each subpixel (SP) may include a light emitting element and a transistor for driving the same. etc. may be placed.

Figure 2 shows an example of a circuit structure of a subpixel (SP) arranged on the display panel 110 of the display device 100 according to embodiments of the present invention. The display device (SP) according to embodiments of the present invention 100) shows an example of an organic light emitting display device.

In addition, although embodiments of the present invention are mainly described with respect to an organic light emitting diode (OLED) display device, the present invention is not limited thereto and may also be applied to an inorganic light emitting diode display device.

Referring to FIG. 2, a subpixel (SP) according to embodiments of the present invention includes an organic light emitting diode (OLED), a driving transistor (DRT) that drives the organic light emitting diode (OLED), and a first transistor. (T1), a second transistor (T2), and a storage capacitor (Cstg). That is, it may be a 3T1C structure including three transistors and one capacitor.

In addition, a gate line (GL) and a data line (DL) are disposed in the subpixel (SP), a driving voltage line (DVL) to which the driving voltage (Vdd) is applied, and a reference voltage line to which the reference voltage (Vref) is applied. (RVL) can be placed. Here, the driving voltage line (DVL) and the reference voltage line (RVL) may be arranged one at a time for each of two or more subpixels (SP).

The first transistor T1 is electrically connected between the data line DL and the gate node of the driving transistor DRT. Additionally, the gate node of the first transistor T1 may be electrically connected to or formed integrally with the first gate line GL1.

The first transistor T1 is turned on and off by the scan signal applied to the first gate line GL1, and the data voltage Vdata supplied through the data line DL is turned on and off by the driving transistor DRT. ) is controlled to be applied to the gate node. This first transistor T1 is also called a switching transistor.

The second transistor T2 is electrically connected between the reference voltage line RVL and the source node of the driving transistor DRT. Additionally, the gate node of the second transistor T2 may be electrically connected to or formed integrally with the second gate line GL2.

The second transistor T2 is turned on and off by the scan signal applied to the second gate line GL2, and the reference voltage Vref supplied through the reference voltage line RVL is applied to the driving transistor ( DRT) is controlled to be applied to the source node.

The driving transistor (DRT) is electrically connected between the driving voltage line (DVL) and the organic light emitting diode (OLED).

The driving transistor (DRT) is turned on by the data voltage (Vdata) applied to the gate node, and controls the driving voltage (Vdd) to be applied to the organic light emitting diode (OLED) according to the data voltage (Vdata).

The storage capacitor Cstg is electrically connected between the gate node and source node of the driving transistor DRT. This storage capacitor (Cstg) can maintain the data voltage (Vdata) applied to the gate node of the driving transistor (DRT) for one frame.

Organic light-emitting diodes (OLEDs) display brightness based on the difference between the voltage applied to the anode electrode by the driving transistor (DRT) and the base voltage (Vss), allowing each subpixel (SP) to display an image. .

These subpixels (SP) may be designed in various structures in addition to the 3T1C structure described above.

The display device 100 according to embodiments of the present invention may include a subpixel (SP) disposed for fingerprint sensing in addition to a subpixel (SP) for displaying an image in the active area of the display panel 110. .

FIG. 3 shows an example of a schematic structure in which a fingerprint sensing subpixel (FS-SP) is disposed on the display panel 110 of the display device 100 according to embodiments of the present invention.

Referring to FIG. 3, the display panel 110 of the display device 100 according to embodiments of the present invention includes a subpixel (SP) for displaying an image and a fingerprint sensing subpixel (FS-SP) for fingerprint sensing. can be placed.

A subpixel (SP) that displays an image can be divided into a light emitting area and an area where circuit elements are placed. In addition, each subpixel (SP) can display red, green, or blue light, and Figure 3 shows a structure in which the red subpixel (SP), green subpixel (SP), and blue subpixel (SP) are arranged. This shows one example.

A fingerprint sensing subpixel (FS-SP) for fingerprint sensing may be placed adjacent to a subpixel (SP) that displays an image. The fingerprint sensing subpixel (FS-SP) may be arranged equal to the number of subpixels (SP) displaying an image, and one fingerprint sensing subpixel (FS-SP) for every two or more subpixels (SP). It may be deployed. Additionally, a fingerprint sensing subpixel (FS-SP) may be disposed only in an area where fingerprint sensing is performed in the active area of the display panel 110.

Circuit elements such as transistors and capacitors for performing fingerprint sensing may be disposed in the fingerprint sensing subpixel (FS-SP). Additionally, a sensor that responds to light may be disposed.

Then, scan lines, voltage lines, etc. for driving transistors, capacitors, sensors, etc. are arranged, and driving for fingerprint sensing is performed by signals and voltage applied through the scan lines and voltage lines.

As an example, a sensing scan line (SSL) that controls on and off of a transistor disposed in the fingerprint sensing subpixel (FS-SP) may be disposed. Additionally, any one of the voltage lines arranged to drive the display may be used as the voltage line to which the voltage supplied to the fingerprint sensing subpixel (FS-SP) is applied.

That is, the data line (DL) or the reference voltage line (RVL) can be used as a line to which voltage is applied for fingerprint sensing. Additionally, the data line (DL) or the reference voltage line (RVL) may be used as a line to detect a sensing signal from the fingerprint sensing subpixel (FS-SP).

Therefore, the fingerprint sensing function is provided by arranging transistors, capacitors, sensors, and sensing scan lines (SSL) for fingerprint sensing, and using the data line (DL) or reference voltage line (RVL) arranged to drive the display. Fingerprint sensing subpixel (FS-SP) can be implemented.

FIGS. 4A and 4B show examples of the circuit structure of the fingerprint sensing subpixel (FS-SP) shown in FIG. 3.

Referring to FIG. 4A, a data line (DL), a reference voltage line (RVL), and a sensing scan line (SSL) may be disposed in the fingerprint sensing subpixel (FS-SP) according to embodiments of the present invention.

Additionally, a sensing transistor (SENT), a light sensor (PS), and a sensing capacitor (Csen) may be disposed.

The sensing transistor (SENT) is electrically connected between the data line (DL) and the sensing capacitor (Csen). Additionally, the gate node of the sensing transistor (SENT) may be electrically connected to or formed integrally with the sensing scan line (SSL).

The sensing capacitor Csen is electrically connected between the sensing transistor SENT and the reference voltage line RVL.

The connection structure of the sensing transistor (SENT) and sensing capacitor (Csen) with the data line (DL) and reference voltage line (RVL) is an example, in which the sensing transistor (SENT) is connected to the reference voltage line (RVL) and the sensing capacitor (Csen) may be a structure connected to the data line (DL).

In other words, depending on which line among the data line (DL) and the reference voltage line (RVL) the driving voltage for fingerprint sensing is applied and the sensing signal is detected, the voltage connected to the sensing transistor (SENT) and sensing capacitor (Csen) Lines may vary. The fingerprint sensing subpixel (FS-SP) shown in FIG. 4A shows an example of a structure when the data line (DL) is used as a sensing line.

The optical sensor PS may be electrically connected between the drain node and the source node of the sensing transistor SENT.

This optical sensor (PS) may have photosensitivity that changes its electrical characteristics when exposed to light of a specific wavelength.

For example, the optical sensor PS operates like an insulator before being exposed to light, and when exposed to light, its electrical characteristics change so that both ends are electrically connected and it operates like a conductor. Here, the optical sensor (PS) is also called a photo sensor, and Figure 4a shows an example in which a bidirectional diode is disposed as the optical sensor (PS).

That is, in a structure where the optical sensor (PS) is electrically connected between the drain node and the source node of the sensing transistor (SENT), when the optical sensor (PS) is exposed to light when the sensing transistor (SENT) is in the off state, the optical sensor ( A current flowing through PS) may occur. Accordingly, current flows between the drain node and the source node of the sensing transistor (SENT).

Here, since the sensing capacitor (Csen) is connected to the source node of the sensing transistor (SENT), if leakage current due to light exposure occurs while the sensing capacitor (Csen) is charged, the voltage charged in the sensing capacitor (Csen) It changes.

By sensing the change in the charging voltage of the sensing capacitor Csen, a sensing signal generated depending on whether the optical sensor PS is exposed to light can be detected. And, using these sensing signals, the ridges and valleys of the fingerprint touched on the display panel 110 can be decomposed and the fingerprint can be sensed.

This fingerprint sensing subpixel (FS-SP) may be configured by arranging a photo diode as an optical sensor (PS).

Referring to FIG. 4B, a data line (DL), a reference voltage line (RVL), and a sensing scan line (SSL) are disposed in the fingerprint sensing subpixel (FS-SP) according to embodiments of the present invention.

Additionally, a sensing transistor (SENT), a sensing capacitor (Csen), and a light sensor (PS) may be disposed.

The sensing transistor (SENT) is electrically connected between the data line (DL) and the optical sensor (PS). Additionally, the gate node of the sensing transistor (SENT) may be electrically connected to or formed integrally with the sensing scan line (SSL).

The optical sensor (PS) is electrically connected between the sensing transistor (SENT) and the reference voltage line (RVL). Additionally, the sensing capacitor Csen may be connected in parallel with the optical sensor PS.

Alternatively, as described in FIG. 4A, the sensing transistor (SENT) may be connected to the reference voltage line (RVL), and the optical sensor (PS) may be connected to the data line (DL). The fingerprint sensing subpixel (FS-SP) shown in FIG. 4B shows an example of a structure when the data line (DL) is used as a sensing line.

When a photodiode is placed as the optical sensor (PS), when the optical sensor (PS) is exposed to light, current may flow in the reverse direction through the optical sensor (PS). That is, a current flowing from the third node N3 to the reference voltage line RVL may occur.

Therefore, when the driving voltage is applied to the third node (N3) and the sensing transistor (SENT) is turned off, the voltage of the third node (N3) changes due to the current generated when the optical sensor (PS) is exposed to light. It can happen.

By sensing the voltage change of the third node N3, the ridge or valley of the fingerprint touched on the fingerprint sensing subpixel FS-SP can be determined and the fingerprint can be sensed.

Figure 5 shows the principle of sensing a fingerprint using the optical sensor (PS) disposed in the fingerprint sensing subpixel (FS-SP) in the display device 100 according to embodiments of the present invention.

Referring to FIG. 5, the display device 100 according to embodiments of the present invention has an optical sensor (PS) disposed in a fingerprint sensing subpixel (FS-SP) on a substrate 530.

Additionally, the display device 100 may include a light source device 510 that irradiates light during the fingerprint sensing period, and a light guide plate 520 that guides the light emitted from the light source device 510. This light guide plate 520 may be an additional light guide panel or light guide device, or may be a structure included in the display device 100, such as the cover glass of the display panel 110. .

During the fingerprint sensing period, when the light source device 510 radiates light of a specific wavelength, the light irradiated from the light source device 510 may be emitted along the light guide plate 520.

At this time, when a fingerprint touches the surface of the display panel 110, light may be transmitted or reflected depending on the ridge, which is a protruding part, and the valley, which is a recessed part, of the fingerprint.

For example, the light that reaches the part where the ridge of the fingerprint contacts the light guide plate 520 is transmitted because the refractive index of the finger and the glass are almost the same. And, since the light passes through and is emitted to the outside, the optical sensor PS disposed in the area corresponding to the ridge of the fingerprint is not exposed to light (light blocking area).

And, in the area where the valley of the fingerprint is located, the valley of the fingerprint and the light guide plate 520 do not contact, and air is located between them. Since the refractive index of air is different from that of glass, light does not transmit but is reflected in the area where the valley of the fingerprint is located. Accordingly, the optical sensor PS disposed in the area corresponding to the valley of the fingerprint is exposed to light (light exposure area).

That is, the light sensor (PS) placed in the area corresponding to the ridge of the fingerprint is blocked from light, and the light sensor (PS) placed in the area corresponding to the valley of the fingerprint can be exposed to light. there is.

Additionally, the electrical characteristics of the optical sensor (PS) may change differently depending on light blocking or light exposure.

Using changes in electrical characteristics due to light blocking or light exposure of the optical sensor (PS), the fingerprint sensing subpixel (FS-SP) located in the area corresponding to the ridge of the fingerprint and the valley of the fingerprint ( Other sensing signals can be detected from the fingerprint sensing subpixel (FS-SP) located in the area corresponding to the valley.

Using the difference in the sensing signal detected from the fingerprint sensing subpixel (FS-SP), the ridges and valleys of the fingerprint are separated and the fingerprint touched on the display panel 110 can be sensed.

As such, embodiments of the present invention place a fingerprint sensing subpixel (FS-SP) including a light sensor (PS) on the display panel 110, thereby detecting the user's touch on the active area of the display panel 110. Enables fingerprint sensing.

Hereinafter, a specific driving method of the above-described fingerprint sensing subpixel (FS-SP) will be described with reference to FIGS. 6 to 13.

Figures 6 to 9 show the driving method of the fingerprint sensing subpixel (FS-SP) shown in Figure 4a.

Since this fingerprint sensing subpixel (FS-SP) uses the data line (DL) as a line for fingerprint sensing, it can be performed in a time-divided period from the display driving period.

Therefore, fingerprint sensing can be performed by allocating a portion of the display driving period or, when a touch sensing function is provided, a portion of the touch sensing period. Alternatively, fingerprint sensing may be performed only when fingerprint sensing is required by an application running on the display device 100.

Referring to FIG. 6, in the fingerprint sensing subpixel (FS-SP) according to embodiments of the present invention, a sensing transistor (SENT), a sensing capacitor (Csen), and between the drain node and the source node of the sensing transistor (SENT) An electrically connected optical sensor (PS) is disposed. Additionally, a sensing scan line (SSL) is disposed for on and off control of the sensing transistor (SENT).

The data line DL may be controlled so that a voltage for driving a display or a voltage for fingerprint sensing is applied by the first switch SW1 included in the data driving circuit 130.

This data line DL may be connected to the sensing circuit 150.

The sensing circuit 150 may include a second switch SW2 electrically connected to the data line DL, an amplifier, and a feedback capacitor Cfb.

One end of the second switch SW2 of the sensing circuit 150 may be electrically connected to the data line DL, and the other end may be electrically connected to the (-) input terminal of the amplifier. A feedback capacitor (Cfb) may be electrically connected between the (-) input terminal and the output terminal of the amplifier. Additionally, the amplifier may output a signal detected through the data line DL when the second switch SW2 is turned on during the fingerprint sensing period.

This sensing circuit 150 may be placed separately from the data driving circuit 130 or may be placed inside the data driving circuit 130. Additionally, this configuration of the sensing circuit 150 is just an example, and various types of circuits capable of detecting signals through the data line DL may be applied.

Figure 6 shows the operation of the fingerprint sensing subpixel (FS-SP) during the driving period of the fingerprint sensing period. Fingerprint sensing according to embodiments of the present invention consists of a driving period (① Driving) and a light irradiation period (② Lighting). ), reset period (③ Reset), and sensing period (④ Sensing).

During the fingerprint sensing period, the first switch SW1 included in the data driving circuit 130 is connected to a circuit that outputs a voltage for fingerprint sensing.

During the driving period of the fingerprint sensing period, a scan signal is applied through the sensing scan line (SSL) to turn on the sensing transistor (SENT). Then, the data driving circuit 130 outputs the sensing driving voltage (Vdrv) through the data line (DL).

Since the sensing transistor SENT is turned on, the sensing driving voltage Vdrv applied through the data line DL is applied to the third node N3 to charge the sensing capacitor Csen.

Figure 7 shows the operation of the fingerprint sensing subpixel (FS-SP) during the light irradiation period during the fingerprint sensing period.

Referring to FIG. 7, when the supply of the sensing driving voltage (Vdrv) to the third node (N3) is completed during the driving period of the fingerprint sensing period, the sensing transistor (SENT) is turned off during the light irradiation period and the light source device 510 ) Light is irradiated from.

Since light is irradiated while the sensing transistor (SENT) is turned off, a leakage voltage (Vleak) may occur depending on whether the optical sensor (PS) connected to the sensing transistor (SENT) is exposed to light. Since the larger the difference in leakage voltage (Vleak), the larger the difference in the sensing signal occurs, the light irradiation period during the fingerprint sensing period may be set sufficiently long.

Here, the data driving circuit 130 outputs a reference voltage (Vref) or a sensing reference voltage to the data line (DL) during the period when light is irradiated.

This sensing reference voltage is intended to generate a leakage voltage (Vleak) through the optical sensor (PS), and may be a voltage that can generate a voltage difference between the drain node and the source node of the sensing transistor (SENT). For example, the sensing reference voltage may be a reference voltage (Vref), a common voltage, or a ground voltage, or may be a voltage set separately for fingerprint sensing.

That is, during the light irradiation period, a sensing reference voltage having a level different from the sensing driving voltage Vdrv supplied through the data line DL during the driving period of the fingerprint sensing period may be supplied to the data line DL.

Since the sensing transistor (SENT) is in the off state and a voltage difference exists between the drain node and the source node of the sensing transistor (SENT), the light through the light sensor (PS) depends on whether the light sensor (PS) is exposed to light. Leakage voltage (Vleak) may occur.

For example, since the area corresponding to the ridge of the fingerprint corresponds to the light blocking area, the optical sensor (PS) of the fingerprint sensing subpixel (FS-SP) disposed in the area is not exposed to light. Accordingly, since the optical sensor PS maintains a non-conducting state, leakage voltage Vleak through the optical sensor PS does not occur.

And, since the area corresponding to the valley of the fingerprint corresponds to the light exposure area, the optical sensor (PS) of the fingerprint sensing subpixel (FS-SP) disposed in the area is exposed to light. Accordingly, the optical sensor PS operates like a conductor and a leakage voltage Vleak occurs through the optical sensor PS, so the voltage charged in the third node N3 changes.

Therefore, after the light irradiation period, the fingerprint sensing subpixel (FS-SP) corresponding to the ridge of the fingerprint and the fingerprint sensing subpixel corresponding to the valley of the fingerprint are detected through voltage sensing of the third node (N3). (FS-SP) can be distinguished, and fingerprints can be sensed by disassembling the ridges and valleys of the fingerprint.

Here, the voltage of the third node N3 after the light irradiation period can be sensed through the data line DL. At this time, the voltage state of the data line DL may be different for each fingerprint sensing subpixel (FS-SP), and because of this, the voltage of the third node N3 may not be accurately sensed.

Embodiments of the present invention perform a process of initializing or resetting the data line DL after the light irradiation period in order to improve the accuracy of the sensing voltage after the light irradiation period.

Figure 8 shows the operation of the fingerprint sensing subpixel (FS-SP) during the reset period during the fingerprint sensing period.

Referring to FIG. 8, the light source device 510 stops emitting light during the reset period of the fingerprint sensing period. Then, the sensing transistor (SENT) is maintained in an off state, and the sensing reset voltage (Vrst) is output to the data line (DL).

This sensing reset voltage (Vrst) is a voltage for adjusting the voltage level of the data line (DL) placed in the fingerprint sensing subpixel (FS-SP) to a constant level, and may be the reference voltage (Vref) or the ground voltage. It may be.

That is, the data driving circuit 130 includes each fingerprint sensing subpixel (FS-SP) to accurately sense the voltage of the third node (N3) before sensing the voltage of the third node (N3) after the light irradiation period. ) outputs the same level of sensing reset voltage (Vrst) to the data line (DL).

Here, the sensing reset voltage Vrst may be a voltage at the same level as the voltage input to the (+) input terminal of the amplifier of the sensing circuit 150.

Since the amplifier of the sensing circuit 150 outputs a signal corresponding to the difference between the voltage input to the (+) input terminal and the voltage input to the (-) input terminal, before sensing the voltage of the third node N3, the data line ( The voltage level of DL) can be adjusted to the voltage level input to the (+) input terminal of the amplifier.

Therefore, it is possible to accurately sense the voltage of the third node (N3) during the sensing period.

Figure 9 shows the operation of the fingerprint sensing subpixel (FS-SP) during the sensing period of the fingerprint sensing period.

Referring to FIG. 9, after the voltage level of the data line (DL) is adjusted to be constant by the sensing reset voltage (Vrst), the sensing transistor (SENT) is turned by the scan signal applied to the sensing scan line (SSL). He orders it to come on. Then, the second switch SW2 included in the sensing circuit 150 is turned on.

Here, sensing may be performed by turning on the sensing transistor (SENT) and the second switch (SW2) after a certain period of time after the sensing reset voltage (Vrst) is applied.

When the sensing transistor (SENT) and the second switch (SW2) are turned on, the (-) input terminal of the amplifier of the sensing circuit 150 is connected to the data line (DL). Additionally, the voltage of the third node N3 can be sensed through the data line DL.

Since the voltage of the third node (N3) has a different voltage level depending on the light exposure of the optical sensor (PS) disposed in the fingerprint sensing subpixel (FS-SP), the subpixels located in the light blocking area and the light exposure area Different sensing signals can be detected from (SP).

Therefore, after sensing the voltage of the third node N3 by the sensing circuit 150, the positions of the ridge and valley of the fingerprint are distinguished using the detected sensing signal, and the display panel 110 ) can sense the fingerprint touched.

This fingerprint sensing subpixel (FS-SP) can perform fingerprint sensing using a similar driving method even when a photo diode is disposed as an optical sensor (PS).

Figures 10 to 13 show the driving method of the fingerprint sensing subpixel (FS-SP) shown in Figure 4b.

Referring to FIG. 10, a sensing transistor (SENT) is disposed in the fingerprint sensing subpixel (FS-SP) according to embodiments of the present invention, and is electrically connected between the sensing transistor (SENT) and the reference voltage line (RVL). A connected optical sensor (PS) is placed. Additionally, a sensing capacitor (Csen) connected in parallel with the optical sensor (PS) is disposed, and a sensing scan line (SSL) that controls the on and off of the sensing transistor (SENT) is disposed.

The data driving circuit 130 may be controlled so that a voltage for driving a display or a voltage for fingerprint sensing is applied by the first switch (SW1) included in the data driving circuit 130. And, the data line DL may be connected to the sensing circuit 150.

Figure 10 shows the operation of the fingerprint sensing subpixel (FS-SP) during the driving period of the fingerprint sensing period. Fingerprint sensing according to embodiments of the present invention consists of a driving period (① Driving) and a light irradiation period (② Lighting). ), reset period (③ Reset), and sensing period (④ Sensing).

The sensing transistor (SENT) is turned on by the scan signal applied to the sensing scan line (SSL) during the driving period of the fingerprint sensing period. Then, the data driving circuit 130 outputs the sensing driving voltage (Vdrv) to the data line (DL).

Since the sensing driving voltage (Vdrv) is supplied through the data line (DL) when the sensing transistor (SENT) is turned on, the sensing capacitor (Csen) connected to the third node (N3) is charged.

When the supply of the sensing driving voltage (Vdrv) is completed, light is emitted from the light source device 510.

Figure 11 shows the operation of the fingerprint sensing subpixel (FS-SP) during the light irradiation period during the fingerprint sensing period.

Referring to FIG. 11, the sensing transistor (SENT) is turned off during the light irradiation period of the fingerprint sensing period, and light is irradiated from the light source device 510.

Here, the data driving circuit 130 outputs the sensing reference voltage to the reference voltage line (RVL) connected to the optical sensor (PS), and FIG. 11 shows an example of outputting the reference voltage (Vref) as the sensing reference voltage. indicates.

With the sensing driving voltage (Vdrv) applied to the third node (N3) and the sensing reference voltage applied to the reference voltage line (RVL), when the optical sensor (PS) is exposed to light, the current flowing in the reverse direction of the photo diode It happens.

Accordingly, a leakage voltage (Vleak) occurs through the optical sensor (PS), and the voltage of the third node (N3) may be lowered. On the other hand, if the optical sensor PS is not exposed to light, the voltage of the third node N3 may be maintained constant.

When the light irradiation period is completed, a process of initializing or resetting the data line DL is performed to detect the sensing signal.

Figure 12 shows the operation of the fingerprint sensing subpixel (FS-SP) during the reset period of the fingerprint sensing period.

Referring to FIG. 12, the light source device 510 stops emitting light during the reset period of the fingerprint sensing period. Then, the sensing transistor (SENT) is maintained in an off state, and the sensing reset voltage (Vrst) is output to the data line (DL).

Through this sensing reset voltage (Vrst), the voltage level of the data line (DL) used to detect the sensing signal is set to a constant level. In addition, accurate sensing is achieved by constantly adjusting the voltage level of the data line (DL) placed in the fingerprint sensing subpixel (FS-SP) and then sensing the voltage of the third node (N3) through the data line (DL). make it happen.

Figure 13 shows the operation of the fingerprint sensing subpixel (FS-SP) during the fingerprint sensing period.

Referring to FIG. 13, the sensing transistor (SENT) is turned on by a scan signal applied to the sensing scan line (SSL) during the sensing period of the fingerprint sensing period. Then, the second switch SW2 included in the sensing circuit 150 is turned on, so that the data line DL and the (-) input terminal of the amplifier are electrically connected.

A sensing signal is output according to the difference between the voltage input through the data line (DL) to the output terminal of the amplifier and the voltage input to the (+) input terminal.

Since the voltage level of the third node (N3) varies depending on whether the optical sensor (PS) is exposed to light, a different sensing signal is generated depending on whether the optical sensor (PS) disposed in the fingerprint sensing subpixel (FS-SP) is exposed to light. can be output.

Therefore, the sensing signal detected from the fingerprint sensing subpixel (FS-SP) corresponding to the ridge of the fingerprint and the sensing signal detected from the fingerprint sensing subpixel (FS-SP) corresponding to the valley of the fingerprint Using the difference, the ridges and valleys of the fingerprint are broken down and the fingerprint touched on the display panel 110 can be sensed.

In this way, the fingerprint sensing subpixel (FS-SP) minimizes the addition of signal wiring by using the data line (DL) or reference voltage line (RVL) as a line to which the voltage for fingerprint sensing is applied and the sensing signal is detected. and can implement fingerprint sensing subpixel (FS-SP).

Alternatively, a separate sensing line (SL) may be placed in the fingerprint sensing subpixel (FS-SP) and the fingerprint sensing subpixel (FS-SP) may be configured.

FIG. 14 shows another example of a schematic structure in which a fingerprint sensing subpixel (FS-SP) is disposed on the display panel 110 of the display device 100 according to embodiments of the present invention.

Referring to FIG. 14, a subpixel (SP) that displays an image and a fingerprint sensing subpixel (FS-SP) may be disposed on the display panel 110 of the display device 100 according to embodiments of the present invention. .

In the fingerprint sensing subpixel (FS-SP), a sensing transistor (SENT), a sensing capacitor (Csen), and a light sensor (PS) for fingerprint sensing may be disposed.

Additionally, a sensing scan line (SSL) that controls on and off of the sensing transistor (SENT) may be disposed.

Here, a sensing drive voltage (Vdrv) is supplied to the fingerprint sensing subpixel (FS-SP) and a sensing signal is used to detect a sensing signal from the fingerprint sensing subpixel (FS-SP). A line (SL) may be placed.

That is, a fingerprint sensing subpixel (FS-SP) can be formed by placing a separate sensing line (SL) in addition to the voltage line arranged for display driving.

This sensing line (SL) may be arranged in parallel with the data line (DL) or the reference voltage line (RVL) and is connected to the data driving circuit 130 and the sensing circuit 150 to apply a voltage for fingerprint sensing. It can be used as a line for receiving and detecting sensing signals.

FIG. 15 shows an example of the circuit structure of the fingerprint sensing subpixel (FS-SP) shown in FIG. 14.

Referring to FIG. 15, even when the sensing line (SL) is disposed in the fingerprint sensing subpixel (FS-SP), the fingerprint sensing sub-pixel is implemented using a sensing transistor (SENT), a sensing capacitor (Csen), and an optical sensor (PS). A pixel (FS-SP) may be configured.

As an example, a sensing scan line (SSL), a sensing line (SL), and a reference voltage line (RVL) are disposed in the fingerprint sensing subpixel (FS-SP). Then, a sensing transistor (SENT), a sensing capacitor (Csen), and a light sensor (PS) are disposed.

The sensing transistor (SENT) may be electrically connected between the sensing line (SL) and the sensing capacitor (Csen). Additionally, the gate node of the sensing transistor (SENT) is connected to the sensing scan line (SSL), and the sensing transistor (SENT) can be turned on and off by a scan signal applied to the sensing scan line (SSL).

The sensing capacitor (Csen) is electrically connected to the sensing transistor (SENT) and the reference voltage line (RVL).

The optical sensor (PS) is electrically connected between the drain node and the source node of the sensing transistor (SENT). A bidirectional diode may be placed as this optical sensor (PS).

Therefore, the sensing driving voltage (Vdrv), sensing reference voltage, and sensing reset voltage (Vrst) are supplied to the sensing line (SL), and the voltage of the third node (N3) is sensed through the sensing line (SL) to perform fingerprint sensing. can be performed.

As another example, a photo diode may be disposed as a light sensor (PS) in the fingerprint sensing subpixel (FS-SP).

This optical sensor (PS) may be electrically connected to the reference voltage line (RVL), and a sensing transistor (SENT) may be electrically connected between the sensing line (SL) and the optical sensor (PS). Additionally, a sensing capacitor (Csen) connected in parallel with the optical sensor (PS) may be disposed.

A voltage for fingerprint sensing is applied from the fingerprint sensing subpixel (FS-SP) to the sensing line (SL), and a sensing signal for fingerprint sensing can be detected through the sensing line (SL).

In this way, by arranging a separate sensing line (SL) in the fingerprint sensing subpixel (FS-SP), fingerprint sensing driving through the sensing line (SL) may be performed independently of display driving.

FIG. 16 shows an example of the driving timing of the fingerprint sensing subpixel (FS-SP) shown in FIG. 15.

Referring to FIG. 16, the fingerprint sensing subpixel (FS-SP) generates a sensing driving voltage (Vdrv) through the sensing line (SL) with the sensing transistor (SENT) turned on during the driving period of the fingerprint sensing period. receive supply.

Also, during the light irradiation period of the fingerprint sensing period, the sensing transistor (SENT) is turned off and the sensing reference voltage is supplied through the sensing line (SL), and the sensing reset voltage (Vrst) is supplied during the reset period.

Afterwards, the sensing transistor (SENT) is turned on during the sensing period of the fingerprint sensing period, and a sensing signal is detected through the sensing line (SL) to enable fingerprint sensing.

Here, fingerprint sensing driving is performed through the sensing line (SL) disposed in the fingerprint sensing subpixel (FS-SP), so fingerprint sensing and display driving can be performed simultaneously. By allowing display driving and fingerprint sensing to be performed simultaneously, fingerprint sensing can be performed without reducing the display driving period.

In particular, in the display device 100, which performs display driving and touch sensing on the display panel by time division, there is no need to secure a separate period for fingerprint sensing, thereby enabling fingerprint sensing without affecting display driving and touch sensing. Allows you to perform.

Such fingerprint sensing may be performed by the data driving circuit 130 and the sensing circuit 150, or may be performed by a single circuit.

FIG. 17 shows an example of a schematic configuration of a driving circuit 1700 that senses a fingerprint in the display device 100 according to embodiments of the present invention.

Referring to FIG. 17 , the driving circuit 1700 according to embodiments of the present invention may include a sensing voltage output unit 1710 and a fingerprint sensing unit 1720.

The sensing voltage output unit 1710 outputs the sensing driving voltage (Vdrv) through the sensing line (SL) during the driving period of the fingerprint sensing period. This sensing line (SL) may be a data line (DL) or a reference voltage line (RVL), or may be a line additionally disposed in the fingerprint sensing subpixel (FS-SP).

The sensing voltage output unit 1710 outputs a sensing reference voltage to the sensing line (SL) or reference voltage line (RVL) during the light irradiation period of the fingerprint sensing period, and outputs the sensing reference voltage to the sensing line (SL) during the reset period of the fingerprint sensing period. Outputs the sensing reset voltage (Vrst).

The fingerprint sensing unit 1720 is connected to the sensing line SL during the sensing period of the fingerprint sensing period. Then, the sensing signal is detected through the sensing line SL, and the fingerprint is sensed by decomposing the ridges and valleys of the fingerprint touched on the display panel 110 based on the detected sensing signal.

Figure 18 shows the process of a fingerprint sensing method of the display device 100 according to embodiments of the present invention.

Referring to FIG. 18, the driving circuit 1700 of the display device 100 according to the present embodiments turns on the sensing transistor (SENT) of the fingerprint sensing subpixel (FS-SP) during the driving period of the fingerprint sensing period. In this state, the sensing driving voltage (Vdrv) is output to the sensing line (SL) (S1800).

During the light irradiation period of the fingerprint sensing period, light is irradiated from the light source device 510 while the sensing transistor (SENT) of the fingerprint sensing subpixel (FS-SP) is turned off (S1820). At this time, the driving circuit 1700 may output the sensing reference voltage to the sensing line SL.

During the reset period of the fingerprint sensing period, with the sensing transistor (SENT) of the fingerprint sensing subpixel (FS-SP) turned off, the driving circuit 1700 outputs the sensing reset voltage (Vrst) to the sensing line (SL). (S1820).

During the sensing period of the fingerprint sensing period, the sensing transistor (SENT) of the fingerprint sensing subpixel (FS-SP) is turned on, and the driving circuit 1700 senses the voltage through the sensing line (SL) and detects the sensing signal. (S1830).

The driving circuit 1700 uses the difference in the sensing signal detected from the fingerprint sensing subpixel (FS-SP) to decompose the ridges and valleys of the fingerprint and senses the fingerprint touched on the display panel 110. Do it (S1840).

Figure 19 shows the effect of the fingerprint sensing function provided by the display device 100 according to embodiments of the present invention.

As shown in FIG. 19, the display device 100 according to embodiments of the present invention arranges a fingerprint sensing subpixel (FS-SP) in the active area of the display panel 110 to detect a fingerprint touched in the active area. Enable sensing.

Accordingly, it is possible to provide a display device 100 that prevents a decrease in the active area due to the arrangement of the fingerprint sensor, improves user convenience, and performs fingerprint sensing.

In embodiments of the present invention, a fingerprint sensing subpixel (FS-SP) composed of a sensing transistor (SENT) and a light sensor (PS) is placed in the active area of the display panel 110, and the light of the light sensor (PS) is It allows sensing voltage changes depending on exposure.

And, based on the sensed voltage change, the positions of the ridges and valleys of the fingerprint touched on the active area of the display panel 110 can be resolved.

In this way, the user's fingerprint touched on the active area of the display panel 110 is identified by distinguishing the ridge and valley of the fingerprint using signals sensed in units of fingerprint sensing subpixels (FS-SP). Enable sensing.

In addition, the voltage line used to drive the fingerprint sensing subpixel (FS-SP) uses the voltage line arranged to drive the display, so that the fingerprint sensing subpixel (FS-SP) can be implemented while minimizing the addition of wiring. do. Alternatively, by arranging a separate sensing line (SL) to form a fingerprint sensing subpixel (FS-SP), fingerprint sensing can be performed simultaneously with the display drive, preventing a decrease in the display drive period and providing a fingerprint sensing function. You can do it too.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and therefore the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: display device 110: display panel
120: gate driving circuit 130: data driving circuit
140: Controller 150: Sensing circuit
510: Light source device 520: Light guide plate
530: substrate 1700: driving circuit
1710: Sensing voltage output unit 1720: Fingerprint sensing unit

Claims (21)

A display panel including a plurality of gate lines, a plurality of data lines, a driving voltage line, a reference voltage line, and a plurality of subpixels; and
A driving circuit that displays an image using one or more first subpixels among the plurality of subpixels and senses a fingerprint using one or more second subpixels among the plurality of subpixels,
In the first subpixel,
A light emitting diode and a driving transistor for driving the light emitting diode are disposed,
In the second subpixel,
A sensing scan line different from the gate line is disposed,
A fingerprint sensor electrically connected is disposed between the data line and the reference voltage line,
The fingerprint sensor is,
It includes a sensing transistor having a first node, a second node, and a third node, a sensing capacitor, and an optical sensor,
The first node of the sensing transistor is electrically connected to the data line, and the second node of the sensing transistor is electrically connected to the sensing scan line,
A display device wherein the second node of the sensing transistor is a gate electrode.
According to paragraph 1,
The optical sensor is,
electrically connected between the first node and the third node of the sensing transistor,
The sensing capacitor is,
A display device electrically connected between the third node of the sensing transistor and the reference voltage line.
According to paragraph 1,
The optical sensor is,
electrically connected between the third node of the sensing transistor and the reference voltage line,
The sensing capacitor is,
A display device connected in parallel with the optical sensor.
According to paragraph 1,
The driving circuit is,
A sensing driving voltage is supplied to the data line in the first period of the fingerprint sensing period, and a sensing reference voltage is supplied to the data line or the reference voltage line in the second period of the fingerprint sensing period. A display device that senses voltage through the data line in three periods.
According to paragraph 4,
The driving circuit is,
A display device that supplies a sensing reset voltage to the data line in at least a portion of the period between the second period and the third period of the fingerprint sensing period.
According to clause 5,
The sensing transistor is,
A display device that is turned on during the first period and the third period of the fingerprint sensing period and turned off during the period excluding the first period and the third period.
According to paragraph 4,
A display device wherein the level of the sensing driving voltage and the level of the sensing reference voltage are different.
According to paragraph 4,
Further comprising a light source that irradiates light during the second period of the fingerprint sensing period,
The fingerprint sensor disposed on the second subpixel exposed to light emitted from the light source generates a current flowing through the optical sensor.
According to paragraph 4,
The driving circuit is,
A display device that supplies a data voltage to the one or more first subpixels during at least a portion of the fingerprint sensing period.
delete According to paragraph 1,
The data line is,
A display device that receives a data voltage during at least a portion of the display driving period and receives a sensing driving voltage during at least a portion of the fingerprint sensing period.
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