KR102458529B1 - Display device, display panel, finger print sensing method, and circuit for sensing finger print - Google Patents

Abstract

The present invention relates to a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor, and more particularly, to a pixel electrode disposed in a pixel region after a driving voltage is applied and then electrically connected to the pixel electrode through a switching transistor By receiving a signal from the data line to detect fingerprint information, fingerprint detection may be possible without a separate fingerprint detection sensor outside the display panel.

Description

Display device, display panel, fingerprint detection method and circuit therefor

The present invention relates to a display device, a display panel, a fingerprint sensing method, and a circuit therefor.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms, and in recent years, a liquid crystal display device (LCD), a plasma display device (PDP), an organic Various display devices such as an organic light emitting display device (OLED) are being used.

Among such display devices, there is a display device capable of providing a touch-based input method that allows a user to easily and intuitively and conveniently input information or a command by breaking away from a conventional input method such as a button, a keyboard, and a mouse.

In order for such a display device to provide a touch-based input method, it is necessary to detect the presence or absence of a user's touch and accurately detect the touch coordinates (touch position).

On the other hand, these days, a display device also utilizes a fingerprint, which is biometric information, as a user authentication means for online banking, product purchase, application purchase and download, and the like.

Such a display device detects a user's fingerprint for various application functions and compares the detected fingerprint with a pre-stored fingerprint to provide user authentication.

As described above, it is most important for the display device to accurately detect fingerprint information in order to accurately perform various application functions.

A conventional display device separately includes a fingerprint detection sensor on the outside of a display panel, and performs fingerprint detection using this.

As such, since the fingerprint sensor needs to be separately provided, the manufacturing process of the display device may be complicated.

In addition, since the fingerprint sensor is provided on the outside of the display panel, the external area of the display panel is inevitably large, which inevitably imposes design restrictions on the exterior design of the display device.

Against this background, an object of the embodiments of the present invention is to provide a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor capable of detecting a fingerprint without separately providing a fingerprint sensor on the outside of the display panel.

Another object of the embodiments of the present invention is to provide a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor, in which a partial area of a display panel is allocated as a fingerprint detection area to perform fingerprint detection.

Another object of the embodiments of the present invention is to provide a display device, a display panel, a fingerprint sensing method, and a circuit therefor capable of performing fingerprint sensing by using a pixel structure as a fingerprint sensing structure.

Another object of the embodiments of the present invention is to provide a display device, a display panel, a fingerprint sensing method, and a circuit therefor that enable fingerprint recognition within an application screen.

Another object of the embodiments of the present invention is to provide a display device, a display panel, a fingerprint sensing method, and a circuit therefor that enable not only capacitance-based fingerprint sensing but also optical type fingerprint sensing.

In one aspect, in the embodiments of the present invention, K data lines (K is a natural number greater than or equal to 2) are disposed, H (H is a natural number greater than or equal to 2) gate lines are disposed, and K data lines and H gate lines are disposed. a display panel in which a plurality of pixel regions defined by , a driving voltage supply circuit for supplying driving voltages to Q (Q is a natural number equal to or greater than 1) data lines among the K data lines, and N (N is 1 or more) among the H gate lines by detecting signals from the Q data lines. A display device including a fingerprint sensing circuit for detecting fingerprint information in a first area including a pixel area defined by a natural number) gate lines and Q data lines may be provided.

In another aspect, embodiments of the present invention may provide a display panel including K (K is a natural number equal to or greater than 2) data lines and H (H is a natural number greater than or equal to 2) gate lines.

In such a display panel, a first region including a pixel region defined by N (N is a natural number greater than or equal to 1) gate lines among H gate lines and Q (Q is a natural number greater than or equal to) data lines among K data lines may be a fingerprint detection area for detecting fingerprint information.

In the display panel, during the charging period within the fingerprint detection mode period, a gate signal having a turn-on level voltage is sequentially supplied to the N gate lines, and a driving voltage that is different from the image data voltage may be supplied to the Q data lines. have.

In the display panel, during the detection period within the fingerprint sensing mode period, the gate signals of the turn-on level voltage may be sequentially supplied to the N gate lines, and the Q data lines may be electrically connected to the fingerprint sensing circuit.

In another aspect, in embodiments of the present invention, K data lines (K is a natural number greater than or equal to 2) are disposed, H (H is a natural number greater than or equal to 2) gate lines are disposed, and K data lines and H gates are disposed. It is possible to provide a method of driving a display device including a display panel in which a plurality of pixel regions defined by lines are arranged, and pixel electrodes are disposed in each pixel region.

In this driving method, a fingerprint in a region including a pixel region defined by N (N is a natural number greater than or equal to 1) gate lines among H gate lines and Q (Q is a natural number greater than or equal to) data lines among K data lines It may include a fingerprint detection mode starting step of recognizing the occurrence of a start event for the fingerprint detection mode for detecting information.

Also, the driving method may provide a charging step of sequentially supplying a gate signal of a turn-on level voltage to the N gate lines and supplying a driving voltage that is different from the image data voltage to the Q data lines.

In addition, the driving method includes a sensing step of sequentially supplying a gate signal of a turn-on level voltage to the N gate lines, not supplying the driving voltage to the Q data lines, and detecting the signals of the Q data lines. can do.

In another aspect, embodiments of the present invention provide a first circuit for supplying a driving voltage to Q (Q is a natural number equal to or greater than 1) data lines among K (K is a natural number greater than or equal to 2) data lines, and Q data lines It is possible to provide a circuit for detecting a fingerprint including a second circuit for detecting a signal of.

In another aspect, embodiments of the present invention provide a display panel including a display panel in which a data line is disposed, a gate line is disposed, a pixel area defined by the data line and the gate line is disposed, and a pixel electrode is disposed in the pixel area; , It is possible to provide a display device including a fingerprint sensing circuit for sensing fingerprint information by receiving a signal from a data line electrically connected to the pixel electrode through a switching transistor after a driving voltage is applied to the pixel electrode.

According to the embodiments of the present invention described above, it is possible to provide a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor capable of detecting a fingerprint without separately providing a fingerprint sensor outside the display panel.

Further, according to embodiments of the present invention, a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor can be provided in which a partial area of a display panel is allocated as a fingerprint detection area to perform fingerprint detection.

In addition, according to the embodiments of the present invention, a display device, a display panel, a fingerprint sensing method, and a circuit therefor capable of performing fingerprint sensing by using a pixel structure as a fingerprint sensing structure can be provided.

In addition, according to embodiments of the present invention, a display device, a display panel, a fingerprint sensing method, and a circuit therefor that enable fingerprint recognition within an application screen can be provided.

Further, according to embodiments of the present invention, it is possible to provide a display device, a display panel, a method for detecting a fingerprint, and a circuit therefor that enable not only capacitance-based fingerprint sensing but also optical fingerprint sensing.

1 is a schematic configuration diagram of a display device according to embodiments of the present invention.
2 is a diagram illustrating two types of touch sensing of a display device according to embodiments of the present invention.
3A is a diagram illustrating a fingerprint sensing structure of a display device according to embodiments of the present invention.
3B is an equivalent circuit of a fingerprint sensing structure of a display device according to embodiments of the present invention.
4 is a diagram illustrating circuits for detecting a fingerprint of a display device according to embodiments of the present invention.
5A is a basic configuration diagram of a fingerprint sensing circuit of a display device according to embodiments of the present invention. 5B is a timing diagram illustrating a basic fingerprint sensing driving method of a display device according to embodiments of the present invention.
6 to 8 are operation mode timing diagrams of a display device according to embodiments of the present invention.
9 is a diagram illustrating regions in a display panel according to embodiments of the present invention.
10 to 12 are diagrams illustrating configuration of a data driving circuit and a fingerprint sensing circuit of a display device according to embodiments of the present invention.
13 is a diagram illustrating a timing control switch circuit for driving a first fingerprint detection of a display device according to embodiments of the present invention.
14 is an operation truth table of a timing control switch circuit for driving a first fingerprint detection of a display device according to embodiments of the present invention.
15A and 15B are driving timing diagrams for a first fingerprint sensing driving of a display device according to embodiments of the present invention.
16 is a diagram illustrating a timing control switch circuit for a second fingerprint sensing driving of a display device according to embodiments of the present invention.
17 is an operation truth table of a timing control switch circuit for a second fingerprint sensing driving of a display device according to embodiments of the present invention.
18A and 18B are driving timing diagrams for a second fingerprint sensing driving of a display device according to embodiments of the present invention.
19 is a diagram illustrating an optical fingerprint sensing structure of a display device according to embodiments of the present invention.
20 is an equivalent circuit of an optical fingerprint sensing structure of a display device according to embodiments of the present invention.
21 is a diagram illustrating an apparatus for irradiating light of a display device according to embodiments of the present invention.
22A and 22B are driving timing diagrams for a third fingerprint sensing driving of a display device according to embodiments of the present invention.
23 is a schematic flowchart of a method of driving a display device according to embodiments of the present invention.
24 is a diagram illustrating a circuit for detecting a fingerprint according to embodiments of the present invention.
25 is a diagram illustrating a touch sensing configuration of a display device according to embodiments of the present invention.
26 and 27 are diagrams exemplarily illustrating a location of a fingerprint sensing area in a display panel according to embodiments of the present invention.
28 is a flowchart of a method of driving a display device according to embodiments of the present invention.
29 is a diagram illustrating a fingerprint detection scenario of a display device according to embodiments of the present invention.
30 and 31 are diagrams illustrating driving timing diagrams according to a fingerprint sensing scenario of a display device according to embodiments of the present invention.
32 is an equivalent circuit of a fingerprint detection sensor structure when the display device according to embodiments of the present invention is an organic light emitting display device.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, when 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.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

1 is a schematic configuration diagram of a display device 100 according to embodiments of the present invention, and FIG. 2 is a diagram illustrating two types of touch sensing of a display device according to embodiments of the present invention.

Referring to FIG. 1 , a display device 100 according to embodiments of the present invention may provide an image display function and a touch input function.

The display device 100 according to embodiments of the present invention includes a display panel 110 , a data driving circuit 120 , a gate driving circuit 130 , a controller 140 , and the like to provide an image display function. can do.

K data lines DL and H gate lines GL are disposed on the display panel 110 . K is a natural number greater than or equal to 2, and H is a natural number greater than or equal to 2.

Also, a plurality of pixels defined by K data lines DL and H gate lines GL are arranged on the display panel 110 .

In each pixel region, a pixel electrode to which an image image data voltage corresponding to an image signal of the corresponding pixel is applied, a switching transistor for controlling application of an image image data voltage to the pixel electrode, and the like may be disposed.

The data driving circuit 120 is a circuit that drives K data lines DL for image display, and may output an image image data voltage corresponding to an image signal to the K data lines DL.

The gate driving circuit 130 is a circuit that sequentially drives the H gate lines GL for image display, and may sequentially supply a gate signal (scan signal) to the H gate lines GL for image display. have.

The controller 140 controls the data driving circuit 120 and the gate driving circuit 130 , and sends various control signals (data driving control signal, gate driving) to the data driving circuit 120 and the gate driving circuit 130 . control signal, etc.) to the data driving circuit 120 and the gate driving circuit 130 .

The controller 140 starts scanning according to the timing implemented in each frame, converts input image data input from the outside to match the data signal format used by the data driving circuit 120 , and outputs the converted image data and control the data operation at an appropriate time according to the scan.

The controller 140 may be a timing controller used in a typical display technology or a control device that further performs other control functions including a timing controller.

Although the data driving circuit 120 is located only on one side (eg, upper or lower side) of the display panel 110 in FIG. 1 , the data driving circuit 120 is located on both sides (eg, upper and lower sides) of the display panel 110 according to a driving method, a panel design method, etc. may be located at the bottom).

The data driving circuit 120 may be implemented by including at least one source driver integrated circuit (SDIC).

Each source driver integrated circuit SDIC is connected to a bonding pad of the display panel 110 by a Tape Automated Bonding (TAB) method or a Chip On Glass (COG) method, or , may be directly disposed on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases. In addition, each source driver integrated circuit SDIC may be implemented in a Chip On Film (COF) method mounted on a film connected to the display panel 110 .

Each source driver integrated circuit SDIC may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit SDIC may further include an analog-to-digital converter (ADC) in some cases.

Although the gate driving circuit 130 is located only on one side (eg, left or right side) of the display panel 110 in FIG. 1 , the gate driving circuit 130 is located on both sides (eg, the left side) of the display panel 110 according to a driving method, a panel design method, etc. and to the right) may be located.

The gate driving circuit 130 may be implemented by including at least one gate driver integrated circuit (GDIC).

Each gate driver integrated circuit GDIC is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) type. may be implemented and disposed directly on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases. In addition, each gate driver integrated circuit GDIC may be implemented in a chip-on-film (COF) method mounted on a film connected to the display panel 110 .

Each gate driver integrated circuit GDIC may include a shift register, a level shifter, and the like.

Each pixel disposed on the display panel 110 may include a circuit element such as a transistor.

The type and number of circuit elements constituting each pixel may be variously determined according to a provided function and a design method.

Meanwhile, the display device 100 according to embodiments of the present invention may provide a touch sensing function for sensing a user's touch in order to provide a touch input function.

Here, the touch object that is the user's touch means may be, for example, a finger or a pen. Hereinafter, for convenience of description, it is assumed that the touch object is a finger.

Referring to FIG. 2 , in embodiments of the present invention, the touch sensing function includes a touch position sensing function for detecting the presence of a user's touch and/or a touch position (ie, touch coordinates P(X, Y)), and the user's Includes a fingerprint detection function (fingerprint recognition function) to detect a fingerprint.

In the display device 100 according to the embodiments of the present invention, the touch position sensor for sensing the touch position may be embedded in the display panel 110 .

That is, in the display device 100 according to embodiments of the present invention, the touch screen panel may be a type (eg, an in-cell type, an on-cell type, etc.) embedded in the display panel 110 .

The touch position sensor may be disposed on the entire area of the display panel 110 .

Such a touch position sensor may be, for example, a common electrode (CE of FIG. 3A ) disposed on the display panel 110 and blocked in plurality.

In the display device 100 according to the embodiments of the present invention, a fingerprint sensor for detecting a fingerprint may also be embedded in the display panel 110 .

The fingerprint detection sensor may be disposed in the fingerprint detection area FPSA corresponding to an entire area or a partial area of the display panel 110 .

The fingerprint sensing area FPSA may be an area in which an image is not displayed or an area in which an image is displayed.

Referring to FIG. 1 , a display device 100 according to embodiments of the present disclosure provides a touch sensing function, a touch sensing circuit configured to obtain touch position information by driving a touch position sensor to detect an electrical signal. and a fingerprint detection circuit configured to obtain fingerprint information by detecting an electrical signal by driving the fingerprint detection sensor.

The touch sensing circuit and the fingerprint sensing circuit may be separately configured circuits.

Alternatively, the touch sensing circuit and the fingerprint sensing circuit may be the same circuit.

Alternatively, the fingerprint sensing circuit may be a part of the touch sensing circuit.

Alternatively, the touch sensing circuit may be a part of the fingerprint sensing circuit.

The touch location information may include one or more of information on whether the user touches the screen and information on the touch location (touch coordinates, P(X, Y)).

The fingerprint information may be information including the shape and pattern of a ridge that is a protruding part of a fingerprint of a finger and a valley that is a recessed part therebetween.

Such fingerprint information may be biometric information unique to each user.

On the other hand, the user's touch (including at least one of a touch for detecting a touch position and a touch for detecting a fingerprint) may mean that the user has touched the screen (a touch screen, a surface corresponding to the fingerprint detection area), It may mean a case in which the user is not in contact with the screen but is close to the screen by a certain distance or less.

As described above, the display device 100 may perform various application functions through touch position sensing, and may perform various application functions such as user authentication through fingerprint sensing.

3A is a diagram illustrating a fingerprint sensing structure of the display device 100 according to embodiments of the present invention, and FIG. 3B is an equivalent circuit for the fingerprint sensing structure of the display device 100 according to embodiments of the present invention. .

3A and 3B , the display panel 110 according to embodiments of the present invention has a fingerprint sensing structure based on a pixel structure.

K data lines DL and H gate lines GL are disposed on the display panel 110 of the display device 100 according to embodiments of the present invention, and K data lines DL and H gates are disposed. A plurality of pixels defined by the line GL may be arranged.

A pixel electrode PXL to which an image data voltage (ie, a pixel voltage), which is an image signal corresponding to the pixel, is applied may be disposed in an area corresponding to each pixel, that is, each pixel area PA.

In addition, in each pixel area PA, on/off is controlled by a gate signal applied to a gate node through a corresponding gate line GL, and an electrical connection is made between the corresponding data line DL and the corresponding pixel electrode PXL. A switching transistor SWT connected to .

The switching transistor SWT transfers an image data voltage from the data line DL to the pixel electrode PXL in a turn-on state.

The switching transistor SWT includes a first node E1 electrically connected to the pixel electrode PXL, a second node E2 electrically connected to the data line DL, and electrically connected to the gate line GL. It may have a third node E3 and a semiconductor layer having both ends in contact with the first node E1 and the second node E2 .

The switching transistor SWT may be turned on or off according to a gate signal (also referred to as a scan signal) of the third node E3 from the gate line GL.

In the switching transistor SWT, the first node E1 may be a drain node (drain node) or a source node (source node). The second node E2 may be a source node or a drain node. The third node E3 may be a gate node.

Hereinafter, for convenience of description, it may be described that the first node E1 is a drain node, the second node E2 is a source node, and the third node E3 is a gate node.

The switching transistor SWT may be an n-type transistor or a p-type transistor.

As described above, in embodiments of the present invention, the fingerprint sensing structure may include a pixel electrode PXL, a switching transistor SWT, etc. disposed in each pixel area PA.

In the fingerprint sensing structure in the embodiments of the present invention, the pixel electrode PXL can be considered to correspond to the fingerprint sensing sensor.

Also, in embodiments of the present invention, the fingerprint sensing structure may include a data line DL and a gate line GL.

Meanwhile, the common electrode CE to which the common voltage VCOM is applied may be disposed on the display panel 110 .

The common electrode CE and each pixel electrode PXL may form a storage capacitor Cst serving to maintain a voltage required for image display for one frame time.

The capacitance of the storage capacitor Cst in each pixel is determined by the common voltage VCOM applied to the common electrode PXL and the pixel voltage (corresponding to the image data voltage) applied to each pixel electrode PXL. can be decided.

Meanwhile, when a user touches the display panel 110 , a finger capacitor Cf may be formed between a finger and the pixel electrode PXL.

The capacitance of the finger capacitor Cf may vary according to a position of a corresponding pixel with respect to a touch.

Accordingly, the display device 100 may detect a touch presence and/or a touch position by detecting a difference in capacitance of the finger capacitor Cf.

Also, the capacitance of the finger capacitor Cf may vary depending on a ridge that protrudes from the fingerprint of the finger and a valley that is recessed therebetween.

Accordingly, the display device 100 may detect a difference in capacitance of the finger capacitor Cf and detect fingerprint information including patterns and shapes of ridges and valleys of the fingerprint.

Since the above-described fingerprint detection structure is based on a pixel structure, a separate fingerprint detection sensor for fingerprint detection does not need to be formed on the display panel 110 .

Accordingly, the manufacturing of the display panel 110 having the fingerprint sensing structure can be simplified, and there is an advantage in that the thickness of the display panel 110 having the fingerprint sensing structure can be reduced.

In addition, if an image can also be displayed in the fingerprint sensing area FPSA, since it is not necessary to design a fingerprint sensing structure outside the display panel 110 , the manufacturing of the display device 100 is easy.

Meanwhile, as a fingerprint sensing structure, a light sensor PS, which will be described later with reference to FIG. 20 , may be further included. In this case, the optical sensor PS may be connected to the first node E1 and the second node E2 of the switching transistor SWT.

4 is a diagram illustrating circuits for fingerprint sensing of the display device 100 according to embodiments of the present invention, and FIG. 5A is a basic configuration of a fingerprint sensing circuit of the display device 100 according to embodiments of the present invention. FIG. 5B is a timing diagram illustrating a basic fingerprint sensing driving method of the display device 100 according to embodiments of the present invention.

Referring to FIG. 4 , the fingerprint sensing area FPSA may exist in the entire area of the screen on which an image may be displayed on the display panel 110 .

The fingerprint sensing area FPAS is an area for detecting fingerprint information, and may include one or more pixel areas PA defined by N gate lines GL_F1 to GL_FN and Q data lines DL_F1 to DL_FQ. have. N is a natural number greater than or equal to 1, and Q is a natural number greater than or equal to 1.

The N gate lines GL_F1 to GL_FN are gate lines for driving a display and also gate lines used for driving a fingerprint for sensing a fingerprint. The Q data lines DL_P+1 to DL_P+Q are data lines for driving a display and data lines used for driving a fingerprint sensing. Referring to FIG. 4 , the display device 100 according to embodiments of the present invention provides a driving voltage supply circuit DRVC 410 , a fingerprint sensing circuit FPSC 420 , and a gate driving circuit 130 for fingerprint sensing. ) and the like.

The driving voltage supply circuit 410 may be electrically connected to the data line DL corresponding to one or more pixel areas PA disposed in the fingerprint sensing area FPSA.

Here, a switch circuit for controlling whether the driving voltage supply circuit 410 and the one or more data lines DL is connected may exist between the driving voltage supply circuit 410 and the one or more data lines DL.

The driving voltage supply circuit 410 applies one or more data lines electrically connected to apply the driving voltage VDRV to the pixel electrode PXL in one or more pixel areas PA disposed in the fingerprint sensing area FPSA. A driving voltage VDRV is supplied to (DL).

When the gate signal GATE of the turn-on level voltage supplied to the gate line GL by the gate driving circuit 130 is applied to the gate node of the switching transistor SWT, the switching transistor SWT is turned on , the data line DL and the pixel electrode PXL are electrically connected.

Accordingly, the driving voltage VDRV supplied to the data line DL by the driving voltage supply circuit 410 is applied to the pixel electrode PXL through the turned-on switching transistor SWT.

The fingerprint sensing circuit 420 may be electrically connected to a data line DL corresponding to one or more pixel areas PA disposed in the fingerprint sensing area FPSA.

Between the fingerprint sensing circuit 420 and the one or more data lines DL, a switch circuit controlling whether the fingerprint sensing circuit 420 and the one or more data lines DL is connected may exist.

The fingerprint sensing circuit 420 may detect (detect) a signal of the data line DL when it is electrically connected to the data line DL.

Here, the signal detected by the fingerprint sensing circuit 420 may be a signal corresponding to the electric charge or capacitance stored in the finger capacitor Cf.

Here, the finger capacitor Cf is a capacitor formed between the pixel electrode PXL and the finger, or a capacitor formed between the pixel electrode PXL and the ridge of the finger print, or between the pixel electrode PXL and the valley of the fingerprint. It may be a capacitor formed in

The magnitude of the signal detected by the fingerprint sensing circuit 420 may vary depending on how close the corresponding pixel electrode PXL is to the finger, that is, whether there is a touch.

Also, the magnitude of the signal detected by the fingerprint sensing circuit 420 may vary depending on how close the pixel electrode PXL is positioned to the fingerprint (ridge or valley) of the finger, that is, the ridge or valley of the fingerprint.

The above-described fingerprint sensing circuit 420 includes an amplifier AMP connected to the Q data lines DL_F1 to DL_FQ, and an integrator INTG that receives and integrates an output signal of the amplifier AMP and outputs an integral value; , a sample and hold circuit (SHA) that stores the integral value, and an analog-to-digital converter (ADC) that converts the value stored in the simple and hold circuit (SHA) into a digital value and outputs it.

In the amplifier AMP, the non-inverting input terminal (+) may receive the reference voltage VREF to supply the reference voltage VREF to the corresponding data line DL. In the amplifier AMP, a signal from the corresponding data line DL is input to the inverting input terminal (-). In addition, in the amplifier AMP, the capacitor CFB and the reset switch RESET may be connected in parallel between the inverting input terminal (-) and the output terminal.

The fingerprint sensing circuit 420 is connected between Q data lines DL_F1 to DL_FQ and the amplifier AMP for reference voltage supply processing and sensing processing (signal detection processing) for the Q data lines DL_F1 to DL_FQ. It may further include a switch circuit (SENSE) for controlling whether or not, in some cases, may further include a switch circuit between the simple and hold circuit (SHA) and the analog-to-digital converter (ADC).

Referring to FIG. 5B , the basic fingerprint sensing driving method may be performed during the fingerprint sensing mode period including the charging period S10 and the sensing period S20 .

In the charging section S10, the driving voltage VDRV is applied to the pixel electrode PXL located in the pixel area PA included in the fingerprint sensing area FPSA, so that the pixel electrode PXL and the finger (valley or ridge of the fingerprint) ) between the finger capacitors (Cf) is charged with charge.

The charging section S10 will be described in more detail as follows.

The gate driving circuit 130 supplies the gate signal GATE of the turn-on level voltage to the gate line GL. Here, the gate line GL is a gate line corresponding to the pixel area PA included in the fingerprint sensing area FPSA.

Accordingly, the switching transistor SWT located in the pixel area PA included in the fingerprint sensing area FPSA is turned on.

The driving voltage supply circuit 410 supplies the driving voltage VDRV to the data line DL. Here, the data line DL is a data line corresponding to the pixel area PA included in the fingerprint sensing area FPSA.

Accordingly, the pixel electrode PXL located in the pixel area PA included in the fingerprint sensing area FPSA applies the driving voltage VDRV from the data line DL through the turned-on switching transistor SWT. receive

A finger capacitor Cf is formed between the pixel electrode PXL to which the driving voltage VDRV is applied and a finger (a valley or ridge of a fingerprint), and charges are charged in the finger capacitor Cf.

After the charging period ( S10 ) ends and a predetermined time elapses, the sensing period ( S20 ) proceeds.

In the sensing section S20, the fingerprint sensing circuit 420 reads a signal that can represent the charge or capacitance charged in the finger capacitor Cf between the pixel electrode PXL and the finger (valley or ridge of the fingerprint). is the period

In the sensing period S20 , the gate driving circuit 130 supplies the gate signal GATE of the turn-on level voltage to the gate line GL. Here, the gate line GL is a gate line corresponding to the pixel area PA included in the fingerprint sensing area FPSA.

Accordingly, the switching transistor SWT located in the pixel area PA included in the fingerprint sensing area FPSA is turned on, and the pixel electrode PXL and the data line DL are electrically connected.

In the detection section S20, a switch circuit (which may be the TCSW of FIGS. 13, 16, and 24) existing between the fingerprint detection circuit 420 and the data line DL is a control signal SENSE indicating the detection timing. Accordingly, a switching operation for electrically connecting the fingerprint sensing circuit 420 and the data line DL may be performed.

Accordingly, the fingerprint sensing circuit 420 is electrically connected to the data line DL, and detects a signal (a signal required for fingerprint sensing) through the data line DL.

The detected signal may be a signal indicating a charge or capacitance charged in the finger capacitor Cf between the pixel electrode PXL and the finger (a valley or ridge of a fingerprint).

6 to 8 are operation mode timing diagrams of the display device 100 according to embodiments of the present invention.

6 to 8 , the display device 100 according to embodiments of the present invention basically includes a display mode DM for displaying an image, and a touch for detecting the presence or absence of a touch and/or a touch position. It can operate in sensing mode (TM).

That is, the operation mode of the display device 100 according to embodiments of the present invention may basically include a display mode (DM) and a touch sensing mode (TM).

The display mode section in which the display device 100 operates in the display mode DM and the touch sensing mode section in which the display device 100 operates in the touch sensing mode TM may overlap in time or are separated in time it may have been

That is, the display device 100 may simultaneously operate in the display mode DM and the touch sensing mode TM. Alternatively, the operation section of the display device 100 is time-divided into a display mode section and a touch mode section, so that the display device 100 operates in the display mode (DM) during the display mode section and in the touch sensing mode ( TM) can be used.

Meanwhile, the display device 100 according to embodiments of the present invention may operate in a fingerprint detection mode (FM) for fingerprint detection.

The fingerprint detection mode section in which the display device 100 operates in the fingerprint detection mode FM may be allocated in various ways.

As a first allocation method, the display device 100 may operate in the fingerprint detection mode (FM) within the display mode section.

That is, the fingerprint detection mode section may overlap the display mode section for displaying an image.

For example, as shown in FIG. 6 , the fingerprint detection mode section is included in the display mode section, but may exist in the second half of the display mode section.

As another example, the fingerprint detection mode section is included in the display mode section, but may exist in the first half or the middle part of the display mode section.

As a second allocation method, the display device 100 may operate in the fingerprint detection mode (FM) within the touch detection mode section.

That is, the fingerprint sensing mode section may overlap with the touch sensing mode section for detecting the presence or absence of a touch or a touch position.

For example, as shown in FIG. 7 , the fingerprint sensing mode section is included in the touch sensing mode section, but may exist in the first half of the touch sensing mode section.

As another example, the fingerprint sensing mode section is included in the touch sensing mode section, and may exist in the second half or the middle of the touch sensing mode section.

As a third allocation method, the display device 100 may operate in the fingerprint detection mode (FM) between the display mode section and the touch sensing mode section.

6 and 7 , the display mode section and the touch mode section may be defined by the first synchronization signal SYNC1.

In this case, the fingerprint detection mode section may be defined by the second synchronization signal SYNC2.

Alternatively, the fingerprint detection mode section may be defined without using the second synchronization signal SYNC2.

For example, referring to FIG. 6 , when a predetermined time elapses after the display mode period starts or the display driving to a predetermined position is completed, the fingerprint detection mode period may proceed for a predetermined time.

For another example, referring to FIG. 7 , after the display mode section is completed, if the touch detection mode section starts, the fingerprint detection mode section starts immediately, and when the fingerprint detection mode section ends, the touch detection procedure can be continued. have.

Meanwhile, by one synchronization signal SYNC, a display mode section, a fingerprint sensing mode section, and a touch sensing mode section may be defined according to a predetermined order.

For example, as shown in FIG. 8 , when the signal level of the synchronization signal SYNC is changed from a low level (or high level) to a high level (or low level), a display mode period may proceed.

When the display mode period ends, when the signal level of the synchronization signal SYNC changes from high level (or low level) to low level (or high level) and changes back to high level (or low level) again, fingerprint detection mode The section may proceed.

When the fingerprint detection mode period ends, when the signal level of the synchronization signal SYNC changes from a high level (or low level) to a low level (or high level) and changes back to a high level (or low level), touch detection A mode section may proceed.

As described above, the display device 100 may operate in the fingerprint detection mode by allocating the fingerprint detection mode section at various timings according to the system environment.

9 is a diagram illustrating areas A1, A2, and A3 in the display panel 110 according to embodiments of the present invention.

Referring to FIG. 9 , K data lines DL_1 to DL_K and H gate lines GL_1 to GL_H are disposed in the display panel 110 according to embodiments of the present invention. Here, K is a natural number of 2 or more, and H is a natural number of 2 or more.

A plurality of pixels defined by K data lines DL_1 to DL_K and H gate lines GL_1 to GL_H may be arranged in the display panel 110 .

In the display panel 110 , a pixel electrode PXL may be disposed in each of the plurality of pixel areas PA.

Referring to FIG. 9 , the H gate lines GL_1 to GL_H include N gate lines GL_M+1 to GL_M+N. Here, M is a natural number greater than or equal to 1, and N is a natural number greater than or equal to 1.

The N gate lines GL_M+1 to GL_M+N are gate lines used for fingerprint sensing driving for fingerprint sensing, and may also be referred to as GL_F1 to GL_FN.

Referring to FIG. 9 , K data lines DL_1 to DL_K include Q data lines DL_P+1 to DL_P+Q. Here, P is 0 or a natural number greater than or equal to 1, and Q is a natural number greater than or equal to 1.

The Q data lines DL_P+1 to DL_P+Q are data lines used for driving a display as well as driving a fingerprint sensing.

9, N gate lines GL_F1 to GL_FN among H gate lines GL_1 to GL_H and Q data lines DL_P+1 to DL_P+Q among K data lines DL_1 to DL_K The first area A1 including the pixel area PA defined by is a fingerprint sensing area FPSA for detecting fingerprint information.

Hereinafter, an example of allocating the fingerprint sensing area FPAS will be described in more detail with reference to FIG. 9 .

Referring to FIG. 9 , the H gate lines GL_1 to GL_H include M gate lines GL_1 to GL_M including the first gate line GL_1 to M-th gate line GL_M, and the M+1-th gate line GL_1 to GL_M. It may include N gate lines GL_M+1 to GL_M+N including the gate lines GL_M+1 to M+N-th gate lines GL_M+N.

The M gate lines GL_1 to GL_M are gate lines used only for driving a display, and may also be referred to as GL_D1 to GL_DM.

The N gate lines GL_M+1 to GL_M+N may be disposed next to the M gate lines GL_1 to GL_M.

The N gate lines GL_M+1 to GL_M+N are gate lines used for fingerprint sensing driving for fingerprint sensing, and may also be referred to as GL_F1 to GL_FN.

M may be a natural number equal to or greater than 1 as the total number of gate lines used only for driving the display. N may be a natural number equal to or greater than 1 as the total number of gate lines used for fingerprint sensing driving. M+N is H (the total number of gate lines disposed on the display panel 110 ).

Meanwhile, in FIG. 9 , the N gate lines GL_F1 to GL_FN are illustrated as being disposed following the M gate lines GL_D1 to GL_DM, but may be disposed in front of the M gate lines GL_D1 to GL_DM. .

As described above, N gate lines GL_F1 to GL_FN among all the gate lines GL_1 to GL_H may be defined for driving the fingerprint sensing.

Referring to FIG. 9 , K data lines DL_1 to DL_K include P data lines DL_1 to DL_P including first data lines DL_1 to P-th data lines DL_P, and P+1-th data lines DL_1 to DL_P. Q data lines DL_P+1 to DL_P+Q including data lines DL_P+1 to P+Q-th data lines DL_P+Q, and P+Q+1-th data lines DL_P+Q+ 1) to P+Q+R-th data lines DL_P+Q+R may include R data lines DL_P+Q+1 and DL_P+Q+R.

The P data lines DL_1 to DL_P and the R data lines DL_P+Q+1 and DL_P+Q+R are data lines used only for driving the display.

The Q data lines DL_P+1 to DL_P+Q are data lines used for driving a display as well as driving a fingerprint sensing.

Each of P and R may be 0 or a natural number of 1 or more, but P+R may be 1 or more.

Q is the number of data lines used for fingerprint sensing driving and may be a natural number of 1 or more.

P+Q+R is K (the total number of data lines disposed on the display panel 110 ).

In FIG. 9 , it is shown that data lines only for driving the display are disposed on both the left and right sides of the Q data lines DL_P+1 to DL_P+Q used for driving the display and driving the fingerprint sensing, but on the left or Data lines for only driving the display may be disposed only on the right side.

When the data lines for driving the display only are disposed on only one of the left and right sides of the Q data lines DL_P+1 to DL_P+Q used for driving the display and driving the fingerprint sensing, P or R is zero. can

As described above, among all the data lines DL_1 to GL_K, Q data lines DL_P+1 to DL_P+Q may be defined for fingerprint sensing driving.

As described above, the fingerprint detection mode section in which the display device 100 operates in the fingerprint detection mode FM may include a charging section S10 and a detection section S20 .

In the charging section ( S10 ) and the sensing section ( S20 ) within the fingerprint detection mode section, the driving state of the signal lines will be described.

Referring to FIG. 9 , during the charging period S10 in the fingerprint sensing mode period in which the display device 100 operates in the fingerprint sensing mode FM, switching transistors to N gate lines GL_F1 to GL_FN for driving fingerprint sensing A gate signal GATE of a turn-on level voltage (eg, a high level voltage or a low level voltage) for turning on the SWT may be sequentially supplied.

Also, during the charging period S10 , the driving voltage VDRV, which is a voltage different from the image data voltage DATA, may be supplied to the Q data lines DL_P+1 to DL_P+Q.

During the detection period S20 within the fingerprint detection mode period in which the display device 100 operates in the fingerprint detection mode FM, the gate signal of the turn-on level voltage to the N gate lines GL_F1 to GL_FN for driving fingerprint detection (GATE) may be supplied sequentially.

Also, during the sensing period S20 , Q data lines DL_P+1 to DL_P+Q for driving fingerprint sensing may be electrically connected to the fingerprint sensing circuit 420 .

As described above, by allocating the N gate lines GL_F1 to GL_FN and Q data lines DL_P+1 to DL_P+Q as signal lines for fingerprint sensing driving, they correspond to a partial area of the display panel 110 . The first area A1 may be allocated as the fingerprint detection area FPSA, and fingerprint information may be detected in the first area A1 allocated as the fingerprint detection area FPSA.

Meanwhile, referring to FIG. 9 , the M gate lines GL_D1 to GL_DM except for the N gate lines GL_F1 to GL_FN among the H gate lines GL_1 to GL_H and K data lines DL_1 to DL_K The second area A2 including the defined pixel area PA may correspond to a display area (image display area).

In addition, K-Q data lines DL_P+1 to DL_P+Q excluding Q data lines DL_P+1 to DL_P+Q among the K data lines DL_1 to DL_K, and N gate lines GL_F1 to GL_FN The third area A3 including the pixel area PA defined by ) may correspond to a display area (image display area).

When both P and R are natural numbers equal to or greater than 1, the third area A3 may be divided into two areas by the first area A1 as shown in FIG. 9 .

When one of P and R is 0, the third area A3 may not be divided by the first area A1 .

The second area A2 and the third area A3 that may be the display area are not used as the fingerprint sensing area FPSA.

As described above, the display panel 110 may allocate a display area in which an image is displayed without being used for fingerprint detection.

On the other hand, the first area A1 is a fingerprint detection area FPSA for detecting fingerprint information during a fingerprint detection mode section, and a section other than the fingerprint detection mode section (a display mode section or a fingerprint detection mode section within a display mode section) section), it may be a display area for displaying an image.

As described above, by utilizing the first area A1 as a display area as well as a fingerprint detection area FPSA, a display area capable of displaying an image can be secured as wide as possible, and fingerprint recognition is instantaneous within the application screen. this could be possible

Meanwhile, as a circuit for driving the aforementioned display panel 110 and detecting a fingerprint, the display device 100 according to embodiments of the present invention includes a gate driving circuit for driving H gate lines GL_1 to GL_H ( 130), a data driving circuit 120 for driving the K data lines DL_1 to DL_K, and a driving voltage ( VDRV) and a fingerprint sensing circuit ( 420) and the like.

The gate driving circuit 130 may supply the gate signal GATE to the H gate lines GL_1 to GL_H or M gate lines GL_D1 to GL_DM to drive the display.

The data driving circuit 120 may supply the image data voltage DATA to the K data lines DL_1 to DL_K for driving the display.

Meanwhile, during the fingerprint detection mode section for detecting fingerprint information in the fingerprint detection area FPSA, Q data lines (DL_P+1 to DL_P+Q) and N gate lines (GL_F1 to GL_FN) for driving fingerprint detection are is driven

The gate driving circuit 130 may sequentially supply the gate signal GATE to the N gate lines GL_F1 to GL_FN for fingerprint driving among the H gate lines GL_1 to GL_H for driving the fingerprint.

The driving voltage supply circuit 410 may supply the driving voltage VDRV to Q data lines DL_P+1 to DL_P+Q for fingerprint driving among the K data lines DL_1 to DL_K for driving the fingerprint. have.

The fingerprint sensing circuit 420 detects signals of Q data lines DL_P+1 to DL_P+Q for fingerprint sensing, and N gate lines GL_F1 to GL_FN among H gate lines GL_1 to GL_H ) and the fingerprint information in the fingerprint sensing area FPSA corresponding to the first area A1 including the pixel area PA defined by Q data lines DL_P+1 to DL_P+Q. have.

As described above, the display device 100 detects a fingerprint in the fingerprint sensing area FPSA defined by the N gate lines GL_F1 to GL_FN and Q data lines DL_P+1 to DL_P+Q. N gate lines (GL_F1 to GL_FN) and Q data lines (DL_P+1 to DL_P+Q) for driving purposes are properly driven, and signals are detected through Q data lines (DL_P+1 to DL_P+Q). Fingerprint information can be detected.

10 to 12 are exemplary configuration diagrams of the data driving circuit 120 and the fingerprint sensing circuit 420 of the display device 100 according to embodiments of the present invention.

10 to 12, the fingerprint detection circuit 420 includes a signal detection circuit (TDC, 1010) for detecting signals from Q data lines (DL_P+1 to DL_P+Q) for driving fingerprint detection; It may include a micro control unit (MCU, 1020) that detects fingerprint information using the detection result of the signal detection circuit 1010, and the like.

As shown in FIG. 5A , the signal detection circuit 1010 receives and integrates an amplifier AMP connected to Q data lines DL_P+1 to DL_P+Q, and an output signal of the amplifier AMP. An integrator (INTG) that outputs an integral value, a sample-and-hold circuit (SHA) that stores an integral value, and an analog-to-digital converter (ADC) that converts the value stored in the simple-and-hold circuit (SHA) into a digital value and outputs it, etc. may include

The signal detection circuit 1010 may further include one or more multiplexers between the Q data lines DL_P+1 to DL_P+Q and the amplifier AMP, and a simple and hold circuit SHA and an analog-to-digital converter ( ADC) may further include one or more multiplexers.

As described above, by dividing the fingerprint detection circuit 420 into the signal detection circuit 1010 and the micro control unit 1020, the signal detection function and the fingerprint information detection function can be efficiently performed, and the circuit load can be reduced. can

Meanwhile, as shown in FIGS. 10 and 11 , the signal detection circuit 1010 includes a data driving circuit DDC for supplying the image data voltage DATA to the K data lines DL_1 to DL_K for driving the display. 120) and a separate integrated circuit.

As shown in FIG. 10 , both the data driving circuit 120 and the signal detection circuit 1010 may be positioned on one side of the display panel 110 .

11 , the signal detection circuit 1010 may be located on one side of the display panel 110 , and the data driving circuit 120 may be located on the other side of the display panel 110 .

Meanwhile, as shown in FIG. 12 , the data driving circuit 120 and the signal detecting circuit 1010 may be included together in the integrated integrated circuit 1200 .

As described above, since the data driving circuit 120 and the signal detecting circuit 1010 are all included in one integrated integrated circuit 1200 , the number of circuit components can be reduced.

Meanwhile, one of the data driving circuit 120 , the fingerprint sensing circuit 420 , and the driving voltage supply circuit 410 may be electrically connected to the data line according to an operation mode.

That is, all of the data driving circuit 120 , the fingerprint sensing circuit 420 , and the driving voltage supply circuit 410 are circuits connectable to the data line.

The driving voltage supply circuit 410 is a circuit that supplies the driving voltage VDRV to Q data lines DL_P+1 to DL_P+Q for driving a fingerprint for driving a fingerprint, and is a data driving circuit connectable to the data line. It may be included in the circuit 120 , or may be included in the signal detection circuit 1010 of the fingerprint sensing circuit 420 .

Alternatively, the driving voltage supply circuit 410 is included in a circuit (eg, the integrated integrated circuit 1200 ) including the data driving circuit 120 , or the signal detection circuit 1010 of the fingerprint sensing circuit 420 . may be included in a circuit (eg, the integrated integrated circuit 1200 ) including the .

As described above, circuits related to the data line DL may be integrated and implemented, thereby reducing the number of circuit components.

13 to 15B are diagrams for explaining a first fingerprint sensing driving method of the display device 100 according to embodiments of the present invention.

13 is a diagram illustrating a timing control switch circuit (TCSW) for first fingerprint sensing driving of the display device 100 according to embodiments of the present invention, and FIG. 14 is a display device (TCSW) according to embodiments of the present invention. 100) is an operation truth table of the timing control switch circuit (TCSW) for the first fingerprint sensing driving, and FIGS. 15A and 15B are the first fingerprint sensing driving of the display device 100 according to embodiments of the present invention. This is the driving timing diagram.

15A and 15B , the fingerprint detection mode section includes a charging section ( S10 ) and a detection section ( S20 ).

The charging period S10 and the sensing period S20 may proceed within one frame period or may proceed in different frame periods.

15A and 15B show, for example, the charging period S10 proceeds after display driving is performed within the first frame period, and the sensing period S20 proceeds after display driving proceeds within the second frame period. This is the driving timing diagram for

Accordingly, the section in which the M gate lines GL_D1 to GL_DM are sequentially driven in FIG. 15A is a section in which display driving is performed in the first frame section, and the M gate lines GL_D1 to GL_DM in FIG. 15B are sequentially driven. The driving section is a section in which display driving is performed in the second frame section.

Referring to FIG. 15A , during the charging period S10 , the gate driving circuit 130 sequentially supplies the gate signal GATE of the turn-on level voltage to the N gate lines GL_F1 to GL_FN.

Accordingly, the Q switching transistors SWT disposed in the pixel row corresponding to the gate line to which the gate signal GATE of the turn-on level voltage is supplied among the N gate lines GL_F1 to GL_FN are turned on.

Accordingly, in the corresponding pixel row, Q data lines DL_P+1 to DL_P+Q and Q pixel electrodes PXL are electrically connected by the turned-on switching transistor SWT.

Also, during the charging period S10 , the driving voltage supply circuit 410 supplies the driving voltage VDRV to the Q data lines DL_P+1 to DL_P+Q.

Accordingly, the driving voltage VDRV supplied from the driving voltage supply circuit 410 to the Q data lines DL_P+1 to DL_P+Q is a pixel corresponding to the sequentially opened gate line GL_F1 to GL_FN. It is applied to Q pixel electrodes PXL arranged in a row.

A corresponding finger capacitor Cf is formed between each pixel electrode PXL and the finger according to the ridge or valley of the fingerprint.

When a predetermined time elapses after the aforementioned charging period (S10), the sensing period (S20) may proceed.

Referring to FIG. 15B , during the sensing period S20 , the gate driving circuit 130 sequentially supplies the gate signal GATE of the turn-on level voltage to the N gate lines GL_F1 to GL_FN.

Accordingly, the Q switching transistors SWT disposed in the pixel row corresponding to the gate line to which the gate signal GATE of the turn-on level voltage is supplied among the N gate lines GL_F1 to GL_FN are turned on.

Accordingly, in the corresponding pixel row, Q data lines DL_P+1 to DL_P+Q and Q pixel electrodes PXL are electrically connected by the turned-on switching transistor SWT.

During the sensing period S20 , the driving voltage supply circuit 410 does not supply the driving voltage VDRV to the Q data lines DL_P+1 to DL_P+Q.

During the detection period S20 , the fingerprint sensing circuit 420 is electrically connected to the Q data lines DL_P+1 to DL_P+Q and detects signals of the Q data lines DL_P+1 to DL_P+Q. can do.

According to the above-described first fingerprint sensing driving method, fingerprint sensing in the fingerprint sensing area FPSA of the display panel 110 may be enabled.

According to the first fingerprint sensing driving method described above, the driving voltage VDRV is supplied from the driving voltage supply circuit 410 to each of the Q data lines DL_P+1 to DL_P+Q used for the fingerprint sensing driving purpose. , is electrically connected to the signal detection circuit 1010 of the fingerprint detection circuit 420 and sensed.

In addition, the Q data lines DL_P+1 to DL_P+Q are also used for driving a display. Accordingly, the image data voltage DATA may be supplied from the data driving circuit 120 to each of the Q data lines DL_P+1 to DL_P+Q.

Accordingly, in the embodiments of the present invention, the Q data lines DL_P+1 to DL_P+Q have various uses (image data voltage DATA transfer, driving voltage VDRV transfer, sensing path, etc.). Therefore, it is necessary to configure a switch for these various use changes.

Accordingly, as shown in FIG. 13 , the display device 100 according to embodiments of the present invention further includes a timing control switch circuit TCSW for each of the Q data lines DL_P+1 to DL_P+Q. may include

Referring to FIG. 13 , the timing control switch circuit TCSW for each of the Q data lines DL_P+1 to DL_P+Q drives the corresponding data line among the Q data lines DL_P+1 to DL_P+Q. Whether the voltage supply circuit 410 is electrically connected (first connection control), whether the corresponding data line and the fingerprint sensing circuit 420 are electrically connected (second connection control), and the corresponding data line and the data driving circuit ( 120) may be electrically connected (second connection control).

Each timing control switch circuit TCSW may be implemented by including one or more switch elements.

For example, each timing control switch circuit TCSW may be implemented with one switch element, or may be implemented with two or three switch elements.

When the above-described timing control switch circuit TCSW is used, display driving and fingerprint sensing driving (driving voltage supply and signal detection) for Q data lines DL_P+1 to DL_P+Q may be enabled.

13, 14, and 15 , the timing control switch circuit TCSW may operate according to the first control signal CS1 and the second control signal CS2.

The first control signal CS1 and the second control signal CS2 may be provided from the micro control unit 1020 or the controller 140 .

As a first case, when the first control signal CS1 and the second control signal CS2 are at a first level (eg, a low level (0)), each timing control switch circuit TCSW switches for driving a display. perform the action

That is, when the first control signal CS1 and the second control signal CS2 are at a first level (eg, a low level (0)), each timing control switch circuit TCSW generates Q data lines DL_P+ 1 to DL_P+Q), by electrically connecting the corresponding data line and the data driving circuit 120 , it is possible to control the supply of the image data voltage DATA to the corresponding data line.

As a second case, when the first control signal CS1 is at a second level (eg, high level (1)) and the second control signal CS2 is at a first level (eg, low level (0)), each The timing control switch circuit TCSW may perform a switching operation in the charging period S10 within the fingerprint detection mode period.

That is, when the first control signal CS1 is at the second level (eg, high level (1)) and the second control signal (CS2) is at the first level (eg, low level (0)), each timing control switch The circuit TCSW electrically connects the corresponding data line among the Q data lines DL_P+1 to DL_P+Q and the driving voltage supply circuit 410 , thereby controlling the driving voltage VDRV to be supplied to the corresponding data line. can do.

As a third case, when the first control signal CS1 is at a first level (eg, low level (0)) and the second control signal CS2 is at a second level (eg, high level (1)), each The timing control switch circuit TCSW may perform a switching operation in the detection period S20 within the fingerprint detection mode period.

That is, when the first control signal CS1 is at a first level (eg, low level (0)) and the second control signal (CS2) is at a second level (eg, high level (1)), each timing control switch The circuit TCSW electrically connects the corresponding data line among the Q data lines DL_P+1 to DL_P+Q and the fingerprint detection circuit 420 , so that the signal detection circuit 1010 of the fingerprint detection circuit 420 is It can be controlled to detect the signal of the corresponding data line.

According to the switching operation control of each timing control switch circuit (TCSW) described above, it is possible to effectively control display driving and fingerprint sensing driving (driving voltage supply, signal detection) for Q data lines (DL_P+1 to DL_P+Q). can

16 to 18B are diagrams for explaining a second fingerprint sensing driving method of the display device 100 according to embodiments of the present invention.

16 is a diagram illustrating a timing control switch circuit (TCSW) for a second fingerprint sensing driving of the display device 100 according to embodiments of the present invention, and FIG. 17 is a display device (TCSW) according to embodiments of the present invention. 100) is an operation truth table of the timing control switch circuit (TCSW) for the second fingerprint sensing driving, and FIGS. 18A and 18B are the second fingerprint sensing driving of the display device 100 according to embodiments of the present invention. This is the driving timing diagram.

The second fingerprint sensing driving method is basically the same as the first fingerprint sensing driving method.

However, during fingerprint sensing operation, the parasitic capacitance component that may occur in Q data lines (DL_P+1 to DL_P+Q) is removed or the voltage state of Q data lines (DL_P+1 to DL_P+Q) is reset (initialized). ), there is a difference in that a drive that can do it is added.

Accordingly, when the second fingerprint sensing driving method is described with reference to FIGS. 16 to 18B , only parts that are different from the first fingerprint sensing driving method will be described.

Referring to FIG. 18B , during the sensing period S20 , the fingerprint sensing circuit 420 detects the Q data lines DL_P+1 to DL_P+Q before detecting the Q data lines DL_P+1 to DL_P. +Q) to supply the reference voltage (VREF).

Accordingly, in the sensing period S20 , parasitic capacitance components are removed from the Q data lines DL_P+1 to DL_P+Q and obtained based on the signals detected through the Q data lines DL_P+1 to DL_P+Q. It is possible to increase the accuracy of fingerprint information.

Also, immediately before signal sensing of the Q data lines DL_P+1 to DL_P+Q, after resetting the voltage state of the Q data lines DL_P+1 to DL_P+Q to the reference voltage VREF , since the signals of the Q data lines DL_P+1 to DL_P+Q are detected, the accuracy of fingerprint information obtained based on the detected signals can be increased.

For supply and driving of the reference voltage VREF, referring to FIGS. 16 and 17 , the Q data lines DL_P+1 to DL_P+Q transmit the image data voltage DATA, transfer the driving voltage VDRV, In addition to the sensing path, it is also used for transmitting the reference voltage (VREF). Accordingly, each timing control switch circuit TCSW performs a switching operation for various purposes including transfer of the reference voltage VREF of the Q data lines DL_P+1 to DL_P+Q.

When the first control signal CS1 is at the second level and the second control signal CS2 is at the second level in relation to the transfer of the reference voltage VREF, each timing control switch circuit TCSW is configured to supply the reference voltage. A switching operation may be performed.

That is, when the first control signal CS1 is at the second level and the second control signal CS2 is at the second level, each timing control switch circuit TCSW includes Q data lines DL_P+1 to DL_P+Q. ), by electrically connecting the corresponding data line to the signal detection circuit 1010 of the fingerprint detection circuit 420 , it is possible to control the fingerprint detection circuit 420 to supply the reference voltage VREF to the corresponding data line.

The amplifier included in the signal detection circuit 1010 outputs the reference voltage VREF input to the + terminal to the - terminal, so that the reference voltage VREF is the Q data lines DL_P+1 in the display panel 110 . ~ DL_P+Q) can be supplied to the corresponding data line.

The reference voltage VREF may be effectively supplied to the Q data lines DL_P+1 to DL_P+Q according to the above-described switching operation control of each timing control switch circuit TCSW.

The fingerprint sensing method described above is a capacitance-based fingerprint sensing method, and optical fingerprint sensing may also be possible.

In the following, the fingerprint sensing structure and the fingerprint sensing driving timing described above are used as they are, and an optical fingerprint sensing function is added.

Therefore, the description of the fingerprint sensing structure and the fingerprint sensing driving timing described above will be omitted, and only the contents related to the optical fingerprint sensing function will be mainly described.

19 to 22B are diagrams for explaining a third fingerprint sensing driving method (optical fingerprint sensing driving method) of the display device 100 according to embodiments of the present invention.

19 is a diagram illustrating an optical fingerprint detection structure of the display device 100 according to embodiments of the present invention, and FIG. 20 is an optical fingerprint detection structure of the display device 100 according to embodiments of the present invention. It is an equivalent circuit of the structure, and FIG. 21 is a view showing a light irradiation apparatus 2000 of the display apparatus 100 according to embodiments of the present invention.

19 and 20 , in each pixel area PA included in the first area A1 corresponding to the fingerprint detection area FPSA, as described above, N gate lines ( It is controlled by the gate signal GATE applied to the gate node E3 through the corresponding gate line among the GL_F1 to GL_FN, and the corresponding data line and the corresponding pixel electrode among the Q data lines DL_P+1 to DL_P+Q ( A switching transistor SWT electrically connected between the PXLs may be disposed.

19 and 20 , in each pixel area PA included in the first area A1 corresponding to the fingerprint sensing area FPSA, both ends of the source node E1 or E2 of the switching transistor SWT are and an optical sensor PS connected to the drain node E2 or E1 may be disposed.

Referring to FIG. 21 , the display device 100 according to embodiments of the present invention may include a light irradiation device 2100 for irradiating light to the optical sensor PS.

The light irradiation device 2100 includes a light output device 2110 that outputs light, and a light guide device that guides the light output from the light output device 2110 to the pixel area PA where the optical sensor PS is located. (2120), and the like.

The light guide device 2120 is similar to a light guide plate and may be positioned on a layer on which the switching transistor SWT is formed.

The light output from the light output device 2110 is totally reflected by the light guide device 2120 and is transmitted to the pixel area PA where the light sensor PS is located.

Here, the light guide device 2120 may be positioned on a layer in which the switching transistor SWT is formed.

Meanwhile, referring to FIG. 21 , in the display device 100 according to embodiments of the present invention, a light output timing control device 2130 for controlling a timing at which light is output from the light output device 2110 (light irradiation timing). ) may be further included.

The light output timing control device 2130 may be the micro control unit 1020 or the controller 140 .

The optical sensor PS has a property of reacting to light, ie, photo sensitivity. Here, the reaction to light (photoreaction) means that the electrical characteristics change.

In the display device 100 according to the embodiments of the present invention, the optical sensor PS has photo sensitivity to light of a specific wavelength band.

The optical sensor PS operates like a non-conductor in the state before light irradiation, and operates like a conductor when the light is irradiated, and electrical characteristics change so that both ends are electrically connected. Here, the optical sensor PS is also referred to as a photosensor.

Accordingly, the gate signal of the turn-off level voltage VGL is applied to the gate node E3 of the switching transistor SWT, and between the first node E1 and the second node E2 of the switching transistor SWT. When there is a potential difference, when light is irradiated to the optical sensor PS, the optical sensor PS generates a leakage current Ioff between the first node E1 and the second node E2 of the switching transistor SWT. can do it

The type of light irradiated to the optical sensor PS may be determined according to the material of the optical sensor PS.

For example, the light irradiated to the optical sensor PS may be, for example, visible light or infrared light.

If the light sensor PS is made of a material that responds well to visible light (eg, amorphous silicon), it would be better to determine the irradiated light as visible light.

If the optical sensor PS is made of a material that responds well to infrared rays (eg, amorphous silicon, amorphous silicon doped with n+ or p+), it is preferable that the irradiated light be determined as infrared.

As described above, by selecting an effective irradiated light in consideration of the degree of light reactivity according to the material of the optical sensor PS, the touch sensing performance using the optical sensor PS may be improved.

On the other hand, when the touch is located around the pixel area PA in which the optical sensor PS is disposed, the conductivity of the optical sensor PS to which the light is irradiated may vary.

When a touch is positioned around the pixel area PA in which the optical sensor PS is disposed, the conductivity of the optical sensor PS to which light is irradiated may vary according to the ridge and valley of the fingerprint.

The fingerprint sensing circuit 420 may obtain fingerprint information based on a difference in conductivity of the optical sensor PS according to the ridge and valley of the fingerprint (ie, a difference in leakage current).

As described above, by further grafting the optical method to the capacitance method, the effect of noise such as a parasitic capacitor is less affected, and fingerprint detection can be performed more accurately.

22A and 22B are driving timing diagrams for the third fingerprint sensing driving of the display device 100 according to embodiments of the present invention.

The driving timing diagrams shown in Figs. 22A and 22B are basically the same as the driving timing diagrams shown in Figs. 18A and 18B, with only the signal waveforms relating to the light irradiation timing added.

22A and 22B , the fingerprint detection mode section includes a charging section ( S10 ) and a detection section ( S20 ).

Referring to FIG. 22A , during the charging period S10 , the gate driving circuit 130 sequentially supplies the gate signal GATE of the turn-on level voltage to the N gate lines GL_F1 to GL_FN, and supplies the driving voltage. The circuit 410 supplies the driving voltage VDRV to the Q data lines DL_P+1 to DL_P+Q.

Referring to FIG. 22B , during the sensing period S20 , the light irradiation apparatus 2100 irradiates light to the light sensor PS, and the gate driving circuit 130 turns to N gate lines GL_F1 to GL_FN- The gate signal GATE of the on-level voltage is sequentially supplied, the driving voltage supply circuit 410 does not supply the driving voltage VDRV to the Q data lines DL_P+1 to DL_P+Q, and the fingerprint sensing circuit 420 may be electrically connected to Q data lines DL_P+1 to DL_P+Q to detect signals of Q data lines DL_P+1 to DL_P+Q.

Hereinafter, the fingerprint sensing described above and a driving method therefor will be briefly described below.

23 is a schematic flowchart of a method of driving the display device 100 according to embodiments of the present invention.

Referring to FIG. 23 , in the method of driving the display device 100 according to embodiments of the present invention, N (N is a natural number greater than or equal to 1) gate lines and K data lines among H gate lines GL_1 to GL_H. The start event (fingerprint detection event) for the fingerprint detection mode for detecting fingerprint information in an area including a pixel area (PA) defined by Q (Q is a natural number of 1 or more) data lines among (DL_1 to DL_K) In the fingerprint detection mode starting step S2310 for recognizing the occurrence, the gate signal GATE of the turn-on level voltage is sequentially supplied to the N gate lines GL_F1 to GL_FN, and Q data lines DL_P+1 to DL_P+1 to A charging step S2320 of supplying a driving voltage VDRV, which is a voltage different from the image data voltage DATA, to DL_P+Q), and a gate signal GATE of a turn-on level voltage to N gate lines GL_F1 to GL_FN ) is sequentially supplied, the driving voltage VDRV is not supplied to the Q data lines DL_P+1 to DL_P+Q, and the Q data lines DL_P+1 to DL_P+Q are detected. Step (S2330) and the like may be included.

The start event for the fingerprint detection mode may be generated by various functions of the display device 100 , various application programs, and the like.

For example, when a lock screen release function is executed in a mobile device such as a smart phone, a start event for the fingerprint detection mode may occur.

As another example, when a user is authenticated in a web browser program, an application store application, a product purchase application, a financial application, etc., a start event (fingerprint detection event) for the fingerprint detection mode may occur.

Using the above-described driving method, with respect to the fingerprint sensing area FPSA defined by the N gate lines GL_F1 to GL_FN and Q data lines DL_P+1 to DL_P+Q, N for a fingerprint sensing driving purpose Detect fingerprint information by appropriately driving gate lines GL_F1 to GL_FN and Q data lines DL_P+1 to DL_P+Q, and detecting signals through Q data lines DL_P+1 to DL_P+Q can do.

Meanwhile, before detecting the signals of the Q data lines DL_P+1 to DL_P+Q in the sensing step S2330, the reference voltage VREF can be supplied to the Q data lines DL_P+1 to DL_P+Q. have.

24 is a diagram illustrating a circuit for detecting a fingerprint according to embodiments of the present invention.

Referring to FIG. 24 , the circuit for detecting a fingerprint according to embodiments of the present invention includes Q data lines DL_P+1 to DL_P+Q for driving fingerprint detection among K data lines DL_1 to DL_K. It may include a first circuit 410 for supplying the driving voltage VDRV and a second circuit 1010 for detecting signals of Q data lines DL_P+1 to DL_P+Q.

Using the first circuit 410 and the second circuit 1010 described above, fingerprint information may be detected by driving Q data lines DL_P+1 to DL_P+Q for fingerprint sensing driving.

The above-described second circuit 1010 applies the reference voltage VREF to the Q data lines DL_P+1 to DL_P+Q before detecting the signals of the Q data lines DL_P+1 to DL_P+Q. can supply

Accordingly, the parasitic capacitance component is removed from the Q data lines (DL_P+1 to DL_P+Q), and the accuracy of fingerprint information obtained based on the signals detected through the Q data lines (DL_P+1 to DL_P+Q) can be increased. have.

Also, immediately before signal sensing of the Q data lines DL_P+1 to DL_P+Q, after resetting the voltage state of the Q data lines DL_P+1 to DL_P+Q to the reference voltage VREF , since the signals of the Q data lines DL_P+1 to DL_P+Q are detected, the accuracy of fingerprint information obtained based on the detected signals can be increased.

Meanwhile, referring to FIG. 24 , the circuit for detecting a fingerprint according to embodiments of the present invention further includes a third circuit 120 for supplying the image data voltage DATA to the K data lines DL_1 to DL_K. may include

Accordingly, it is possible to provide not only fingerprint detection but also display driving.

Referring to FIG. 24 , the circuit for detecting a fingerprint according to embodiments of the present invention may further include a timing control switch circuit TCSW for each of the Q data lines DL_P+1 to DL_P+Q. .

The timing control switch circuit TCSW determines whether the corresponding data line is electrically connected to the first circuit 410 among the Q data lines DL_P+1 to DL_P+Q (whether the X1 point and the Y point are connected), Whether the corresponding data line and the second circuit 1010 are electrically connected (the X2 point and the Y point are connected), and whether the corresponding data line and the third circuit 120 are electrically connected (the X3 point and the Y point are connected) or not) can be controlled.

The timing control switch circuit TCSW may be implemented by including one or more switch elements.

When the aforementioned timing control switch circuit TCSW is used, display driving and fingerprint sensing driving (driving voltage supply and signal detection) for Q data lines DL_P+1 to DL_P+Q can be efficiently provided.

25 is a diagram illustrating a touch sensing configuration of the display device 100 according to embodiments of the present invention.

Referring to FIG. 25 , the display device 100 according to embodiments of the present invention is disposed on the display panel 110 to detect the presence or absence of a touch by a finger or a touch object (eg, a pen, etc.) or touch coordinates. It may further include a plurality of touch electrodes (TE) and a touch sensing circuit (TSC, 2500) for driving at least one of the plurality of touch electrodes (TE) to detect the presence or absence of a touch by a finger or a touch object or touch coordinates. can

In addition, a plurality of signal lines SL for electrically connecting the plurality of touch electrodes TE and the touch sensing circuit 2500 may be disposed on the display panel 110 .

On the other hand, the display device 100 according to embodiments of the present invention is a touch sensing method based on self-capacitance or a touch sensing method based on mutual capacitance. coordinates can be detected.

For example, when the display device 100 according to embodiments of the present invention detects the presence or absence of a touch by a finger or a touch object (eg, a pen, etc.) or touch coordinates in a self-capacitance-based touch sensing method, touch sensing The circuit 2500 applies a driving signal to at least one of the plurality of touch electrodes TE, detects a signal from the touch electrode TE to which the driving signal is applied, and detects the presence or absence of a touch or touch coordinates based on the detected signal. have.

For another example, when the display device 100 according to embodiments of the present invention detects the presence or absence of a touch by a finger or a touch object (eg, a pen, etc.) or touch coordinates using a touch sensing method based on a mutual capacitance, touch The sensing circuit 2500 applies a driving signal to at least one driving touch electrode among the plurality of touch electrodes TE, and detects a signal from at least one sensing touch electrode among the plurality of touch electrodes TE. Based on the signal, the presence or absence of a touch or touch coordinates may be detected.

The aforementioned touch sensing circuit 2500 may have the same or similar circuit configuration (AMP, INTG, SHA, ADC) as the fingerprint sensing circuit FPSC of FIG. 5B in terms of internal circuit configuration. However, the wire electrically connected to the inverting input terminal (-) of the amplifier AMP is the signal line SL in the case of the touch sensing circuit 2500 and the data line DL in the case of the fingerprint sensing circuit FPSC. However, the rest may be almost identical.

26 and 27 are diagrams exemplarily showing the location of the fingerprint sensing area FPSA in the display panel 110 according to embodiments of the present invention.

In the examples of FIGS. 26 and 27 , the position of the first area A1 corresponding to the fingerprint sensing area FPSA is not located on one side of the entire area of the screen as in the example of FIG. 9 , but rather of the area of the entire screen. It can be located inside.

Hereinafter, it will be described in more detail with reference to FIGS. 26 and 27 .

Referring to FIG. 26 , in the display panel 110 according to embodiments of the present invention, K data lines and H gate lines are disposed. Here, K is a natural number of 2 or more, and H is a natural number of 2 or more.

Referring to FIG. 26 , the H gate lines include M gate lines including first gate lines GL_1 to M-th gate lines GL_M, and M+1-th gate lines GL_M+1 to M+. N gate lines including the N-th gate line (GL_M+N) and M+N+1-th gate lines (GL_M+N+1) to M+N+S-th gate lines (GL_M+N+S) and may include S gate lines. Here, each of M and S may be 0 or a natural number of 1 or more, and M+S may be 1 or more. N may be a natural number of 1 or more. M+N+S may be H.

Referring to FIG. 26 , K data lines include P data lines including first data lines DL_1 to P-th data lines DL_P, and P+1-th data lines DL_P+1 to P+. Q data lines including Q-th data lines DL_P+Q and P+Q+1-th data lines DL_P+Q+1 to P+Q+R-th data lines DL_P+Q+R It may include R data lines including Here, each of P and R may be 0 or a natural number of 1 or more, but P+R may be 1 or more. Q may be a natural number of 1 or more. P+Q+R may be K.

The N gate lines GL_M+1 to GL_M+N are gate lines driven for driving a display and used for driving a fingerprint for sensing a fingerprint, and may also be referred to as GL_F1 to GL_FN.

The Q data lines DL_P+1 to DL_P+Q are data lines driven for driving a display and used for driving a fingerprint detection, and may also be referred to as DL_F1 to DL_FQ.

The first area A1 including a pixel area defined by N gate lines GL_F1 to GL_FN and Q data lines DL_F1 to DL_FQ may be a display area and a fingerprint sensing area FPSA.

The second area A2 including a pixel area defined by H-N gate lines excluding N gate lines GL_F1 to GL_FN among the H gate lines and K data lines may be a display area.

A third area A3 including a pixel area defined by K-Q data lines excluding Q data lines DL_F1 to DL_FQ among the K data lines and a pixel area defined by N gate lines GL_F1 to GL_FN is a display area. can

26 and 27 , when S is not 0, the second area A2 may be located on both the one side and the other side of the first area A1 and the third area A3 .

When S becomes 0, it may be the same as in FIG. 9 . In this case, the second area A2 may be located on only one side of the first area A1 and the third area A3 .

The size, number, and location of the first area A1 corresponding to the fingerprint sensing area FPSA may be always fixed, but at least one of the size, number, and location of the first area A1 may be variously changed. can be

In addition, at least one of the size, number, and location of the first area A1 corresponding to the fingerprint sensing area FPSA may vary according to time, circumstances, or the like.

The driving method for detecting the fingerprint of the display device 100 according to the embodiments of the present invention is to detect the fingerprint in accordance with the gate driving, and does not consider the touch driving for sensing the touch coordinates, and a part of the display area Fingerprint detection is performed in the area (fingerprint detection area). That is, in the display device 100 according to embodiments of the present invention, the detection sensor using the pixel structure is located in a partial area of the display area.

In the display device 100 according to embodiments of the present invention, the fingerprint driving for detecting a fingerprint may operate in real time like touch driving for detecting touch coordinates, but it may not be necessary to continuously operate in real time.

If fingerprint driving continues in real time like touch driving, it may be difficult to secure a charging time for a display at a high resolution because a time period for touch sensing must be allocated separately.

Hereinafter, examples of timing for fingerprint driving for fingerprint sensing in the display device 100 according to embodiments of the present invention will be described.

28 is a flowchart of a method of driving the display device 100 according to embodiments of the present invention, FIG. 29 is a diagram illustrating a fingerprint detection scenario of the display device 100 according to embodiments of the present invention, and FIG. 30 and FIG. 31 is a diagram illustrating a driving timing diagram according to a fingerprint sensing scenario of the display device 100 according to embodiments of the present invention.

Briefly describing the driving method for fingerprint sensing of the display device 100 according to embodiments of the present invention, the fingerprint sensing circuit 420 may be configured as a fingerprint sensing area FPSA according to the occurrence of a fingerprint sensing event. When the first area A1 is set and a touch by a finger is detected in the first area A1 set as the fingerprint detection area FPSA by the touch sensing circuit 2500, the fingerprint information is stored in the first area A1. detect

28 and 29, the driving method of the display device 100 according to embodiments of the present invention includes a normal driving step (S2810), a fingerprint detection preparation step (S2820), and a fingerprint detection step ( S2830) and the like.

In the normal driving step ( S2810 ), the display device 100 according to embodiments of the present invention performs a display mode DM for displaying a normal image until a fingerprint detection event occurs, and a touch by a finger or a touch object. A touch sensing mode (TM) for detecting presence or touch coordinates may be time-divided or simultaneously performed.

During the display mode period in which the display mode DM is performed, the display device 100 may drive subpixels disposed on the display panel 110 using the data driving circuit 120 and the gate driving circuit 130 . can Accordingly, in the normal driving step S2810 , the normal image NS may be displayed on the display panel 110 .

During the touch sensing mode section in which the touch sensing mode TM is performed, the display device 100 uses the touch sensing circuit 2600 to use at least one of the plurality of touch electrodes TE disposed on the display panel 110 . By applying a driving signal and detecting a sensing signal from at least one of the plurality of touch electrodes TE, the presence or absence of a touch by a finger or a touch object or touch coordinates may be sensed based on the detected signal.

As described above, the display mode DM and the touch sensing mode TM may be time-divided as shown in FIGS. 30 and 31 and may be performed in different time zones, or may be performed simultaneously in the same time zone.

When a predetermined fingerprint detection event occurs while the normal driving step (S2810) is in progress, a fingerprint detection preparation step (S2820) is performed.

Here, the fingerprint detection event may occur, for example, in a user authentication procedure in an application executed on the display device 100 .

Here, for example, the above-mentioned application may be a web browser program, an application related to an application store, an application related to product purchase, an application related to a bank, securities, etc., and an application related to games, music, education, and the like.

In the fingerprint detection preparation step (S2820), when the occurrence of a fingerprint detection event is recognized, the display device 100 according to embodiments of the present invention sets the first area A1, which is a partial area within the entire screen area, as the fingerprint detection area. (FPSA) and detects whether a finger is touched in the first area A1 set as the fingerprint detection area FPSA, and touches by a finger in the first area A1 set as the fingerprint detection area FPSA A first screen for fingerprint detection FPSS1 that is changed according to a detection result of whether or not there is may be displayed.

Here, on the first screen for fingerprint detection FPSS1, for example, a fingerprint recognition guide phrase such as "Put your finger on it for fingerprint recognition." (FPSA) and corresponding) may be indicated separately.

While the fingerprint detection preparation step S2820 is in progress, a touch by a finger is not detected in the first area A1 set as the fingerprint detection area FPSA for a certain period of time, or an input indicating that fingerprint recognition is unnecessary (eg, user input) ) occurs, it may return to the normal driving step (S2810).

While the fingerprint detection preparation step S2820 is in progress, if a touch by a finger is detected in the first area A1 set as the fingerprint detection area FPSA (finger ON detection), the fingerprint detection step S2830 is performed.

In the fingerprint detection step (S2830), the display device 100 according to embodiments of the present invention detects a touch by a finger in the first area A1 set as the fingerprint detection area FPSA, the fingerprint detection area ( The fingerprint information in the first area A1 set to FPSA) may be detected, and a second fingerprint detection screen FPSS2 that is changed according to the detection result of the fingerprint information may be displayed.

Here, on the second fingerprint detection screen FPSS2, for example, a fingerprint recognition process guide phrase such as "fingerprint is being recognized", "fingerprint recognition completed", or "fingerprint recognition failed", a fingerprint recognition result, etc. are detected as a fingerprint. It can be displayed as it changes according to the process.

With reference to FIGS. 29 to 30 , the fingerprint sensing step ( S2830 ) will be described in more detail.

In the fingerprint sensing step (S2830), a DM (display mode) section and a DM/TM/FM (display mode/touch sensing mode/fingerprint sensing mode) section may be alternately performed.

In the DM section, through the remaining areas A2 and A3 except for the first area A1 set as the fingerprint detection area FPSA, the second screen for fingerprint detection FPSS2 on which a guide saying that fingerprint recognition is being performed is displayed. can

Also, in the DM section, the first area A1 set as the fingerprint detection area FPSA according to the driving timing of the gate lines GL_F1 to GL_FN corresponding to the first area A1 set as the fingerprint detection area FPSA. A driving voltage VDRV, ex. 5V for fingerprint sensing, not a data voltage for driving a display, is applied to the data lines DL_F1 to DL_FQ corresponding to .

Meanwhile, during the fingerprint detection step S2830, since the user's finger covers the fingerprint detection area FPSA, the data voltage for driving the display is applied to the first area A1 set as the fingerprint detection area FPSA. Even if the image state becomes abnormal because it is not applied, the user does not recognize it at all. The DM section corresponds to the charging step S10 in FIGS. 15A and 18A .

The DM/TM/FM section that proceeds after the DM section is a section in which display driving, touch driving for touch sensing, and fingerprint driving for fingerprint sensing are combined.

During the DM/TM/FM period, after light irradiation is performed and the reference voltage VREF is applied to the data lines, the gate driving is further performed and fingerprint sensing is performed in the fingerprint sensing area FPSA.

During the DM/TM/FM period, gate lines must be sequentially driven to drive the display and drive the fingerprint.

During the DM/TM/FM section, when the gate lines disposed corresponding to the area A2 other than the first area A1 set as the fingerprint detection area FPSA are turned on, the second fingerprint detection screen FPSS2 ), the display driving data voltage output in the DM section may be equally applied to the corresponding data lines.

During the DM/TM/FM period, the data lines DL_F1 to DL_FQ disposed in the first area A1 set as the fingerprint detection area FPSA do not apply the data voltage for driving the display, but the fingerprint detection area ( It is driven for fingerprint sensing according to the driving timing of the gate lines GL_F1 to GL_FN disposed in the first area A1 set to FPSA).

During the DM/TM/FM period, the data lines DL_F1 to DL_FQ disposed in the first area A1 set as the fingerprint detection area FPSA are detected by the fingerprint detection circuit 420 .

During the DM/TM/FM section, the touch sensing circuit 2500 partially performs touch driving only on the first area A1 set as the fingerprint sensing area FPSA, so that the user's finger in the fingerprint sensing area FPSA It is checked whether it is continuously in contact with the screen.

If the user removes his or her finger from the fingerprint detection area (FPSA) while the fingerprint detection is not finished, immediately return to the fingerprint detection preparation step (S2820) and minimize the exposure of the abnormal display state in the fingerprint detection area (FPSA). give.

If the fingerprint detection is normally completed, the process returns to the normal driving step ( S2810 ). The DM/TM/FM section corresponds to the charging step S10 in FIGS. 15B and 18B .

After the fingerprint sensing step ( S2830 ) is completed, the normal driving step ( S2810 ) may proceed again.

As described above, when the fingerprint detection step (S2830) starts to proceed and, before the fingerprint detection is completed, a finger that was in contact with the first area A1 set as the fingerprint detection area FPSA falls off the screen (fingerprint). It may be moved to a finger OFF during detection), a fingerprint detection preparation step (S2820), or a normal driving step (S2810).

Meanwhile, the display device 100 according to embodiments of the present invention may be a liquid crystal display having a sub-pixel structure as shown in FIGS. 3A and 3B or an organic light emitting diode display.

Hereinafter, referring to FIG. 32 , when the display device 100 according to an embodiment of the present invention is an organic light emitting display device, a structure of a fingerprint detection sensor will be described.

32 is an equivalent circuit of a fingerprint detection sensor structure when the display device 100 according to embodiments of the present invention is an organic light emitting display device.

Referring to FIG. 32 , the subpixel is electrically connected between the organic light emitting diode OLED, the driving transistor DRT for driving the same, and the first node N1 of the driving transistor DRT and the data line DL. It may include a connected switching transistor SWT and a storage capacitor Cstg electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

The organic light emitting diode OLED may include a first electrode connected to the second node N2 of the driving transistor DRT, an organic light emitting layer, and a second electrode to which a ground voltage EVSS is applied.

In the driving transistor DRT, the first node N1 may correspond to a gate node, and the second node N2 may be a source node or a drain node to which the first electrode of the organic light emitting diode (OLED) is connected. The third node N3 may be a drain node or a source node to which the driving voltage EVDD is applied.

The storage capacitor Cstg includes a first plate PLT1 electrically connected to the first node N1 of the driving transistor DRT and a second plate electrically connected to the second node N2 of the driving transistor DRT. PLT2).

The switching transistor SWT transfers the image data voltage from the data line DL to the first node N1 of the driving transistor DRT in a turn-on state. The image data voltage transferred to the first node N1 of the driving transistor DRT is also applied to the first plate PLT1 of the storage capacitor Cstg.

Here, the role of the first plate PLT1 of the storage capacitor Cstg corresponds to the pixel electrode PXL in the fingerprint sensing sensor structure of FIGS. 3A and 3B .

The switching transistor SWT includes a first node E1 electrically connected to the first plate PLT1 of the storage capacitor Cstg, a second node E2 electrically connected to the data line DL, and a gate line It may have a third node E3 electrically connected to the GL, and a semiconductor layer having both ends in contact with the first node E1 and the second node E2 .

The switching transistor SWT may be turned on or off according to a gate signal (also referred to as a scan signal) of the third node E3 from the gate line GL.

In the switching transistor SWT, the first node E1 may be a drain node (drain node) or a source node (source node). The second node E2 may be a source node or a drain node. The third node E3 may be a gate node.

The switching transistor SWT may be an n-type transistor or a p-type transistor.

In addition to the pixel structure or the modified pixel structure described above, the fingerprint detection sensor structure using FIG. 32 is formed between the first node E1 and the second node E2 of the switching transistor SWT in the same manner as in FIG. 20 . An electrically connected optical sensor PS may be further included.

According to the above-described embodiments of the present invention, the display device 100, the display panel 110, the fingerprint sensing method, and the method capable of detecting a fingerprint without separately providing a fingerprint sensor on the outside of the display panel 110, and the same A circuit can be provided for

In addition, according to the embodiments of the present invention, a partial area A1 of the display panel 110 is allocated as the fingerprint detection area FPSA to perform fingerprint detection, the display device 100 , the display panel 110 , and the fingerprint A sensing method and a circuit therefor may be provided.

In addition, according to embodiments of the present invention, it is possible to provide a display device 100, a display panel 110, a fingerprint sensing method, and a circuit therefor capable of performing fingerprint sensing by using a pixel structure as a fingerprint sensing structure. have.

Further, according to embodiments of the present invention, it is possible to provide the display device 100, the display panel 110, the fingerprint sensing method, and a circuit therefor that enable fingerprint recognition within an application screen.

In addition, according to embodiments of the present invention, it is possible to provide a display device 100, a display panel 110, a fingerprint sensing method, and a circuit therefor that enable not only capacitance-based fingerprint sensing but also optical type fingerprint sensing. have.

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may combine the configuration within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device
110: display panel
120: data driving circuit
130: gate driving circuit
140: controller
410: driving voltage supply circuit
420: fingerprint detection circuit
1010: signal detection circuit
1020: micro control unit

Claims (29)

K data lines (K is a natural number greater than or equal to 2) are arranged, H (H is a natural number greater than or equal to 2) gate lines are arranged, and a plurality of pixel areas defined by the K data lines and the H gate lines are a display panel arranged in an array, in which pixel electrodes are disposed in each pixel area;
a gate driving circuit for driving the H gate lines;
a data driving circuit for driving the K data lines;
a driving voltage supply circuit for supplying driving voltages to Q (Q is a natural number equal to or greater than 1) data lines among the K data lines;
a timing control switch circuit for each of the Q data lines; and
By detecting the signals of the Q data lines, fingerprint information in a first area including N (N is a natural number equal to or greater than 1) gate lines among the H gate lines and a pixel area defined by the Q data lines a fingerprint detection circuit for detecting
The timing control switch circuit comprises:
whether the corresponding data line and the driving voltage supply circuit are electrically connected;
whether the corresponding data line and the fingerprint detection circuit are electrically connected;
Controls whether the data line and the data driving circuit are electrically connected,
The timing control switch circuit comprises:
Operates according to the first control signal and the second control signal,
When the first control signal and the second control signal are at a first level,
by electrically connecting the data line and the data driving circuit to control an image data voltage to be supplied to the data line;
When the first control signal is at a second level and the second control signal is at a first level,
controlling the driving voltage to be supplied to the data line by electrically connecting the data line and the driving voltage supply circuit;
When the first control signal is at a first level and the second control signal is at a second level,
By electrically connecting the corresponding data line and the fingerprint sensing circuit, the fingerprint sensing circuit is controlled to detect a signal of the corresponding data line;
When the first control signal is at a second level and the second control signal is at a second level,
A display device that electrically connects a corresponding data line and the fingerprint sensing circuit to control the fingerprint sensing circuit to supply a reference voltage to the corresponding data line. According to claim 1,
The H gate lines are
M gate lines including the first gate line to the M-th gate line;
N gate lines including M+1-th gate lines to M+N-th gate lines;
It includes S gate lines including the M+N+1-th gate line to the M+N+S-th gate line,
Wherein M and S each is 0 or a natural number of 1 or more, M + S is 1 or more,
Wherein N is a natural number of 1 or more,
The M+N+S is the H. According to claim 1,
The K data lines are
P data lines including a first data line to a P-th data line;
Q data lines including P+1-th data lines to P+Q-th data lines;
and R data lines including the P+Q+1th data line to the P+Q+Rth data line,
Wherein P and R each is 0 or a natural number of 1 or more, P + R is 1 or more,
Wherein Q is a natural number greater than or equal to 1,
The P+Q+R is the K. According to claim 1,
a first region including a pixel region defined by the N gate lines and the Q data lines is a fingerprint sensing region;
A second region including a pixel region defined by HN gate lines and the K data lines excluding the N gate lines among the H gate lines is a display region. 5. The method of claim 4,
A third area including a pixel area defined by KQ data lines excluding the Q data lines among the K data lines and the N gate lines is a display area. 6. The method of claim 5,
The second region is positioned on only one side of the first region and the third region, or is positioned on both sides of the first region and the third region. According to claim 1,
The first area is
During the fingerprint detection mode section, a fingerprint detection area for detecting fingerprint information,
A display device that is a display area for displaying an image during a section other than the fingerprint detection mode section. According to claim 1,
The first area is
During the fingerprint detection mode section, a fingerprint detection area for detecting fingerprint information,
During the fingerprint detection mode section,
A display device in which the Q data lines and the N gate lines are driven. 9. The method of claim 8,
The fingerprint detection mode section overlaps the display mode section for displaying an image. 9. The method of claim 8,
The fingerprint sensing mode section overlaps the touch sensing mode section for detecting the presence or absence of a touch or a touch position. 9. The method of claim 8,
The fingerprint detection mode section is a display device that exists between the display mode section and the touch detection mode section. According to claim 1,
The fingerprint detection circuit comprises:
a signal detection circuit for detecting signals from the Q data lines;
and a microcontroller unit configured to detect fingerprint information using a detection result of the signal detection circuit. 13. The method of claim 12,
The driving voltage supply circuit is
included in the data driving circuit or the signal detection circuit;
A display device included in a circuit including the data driving circuit or a circuit including the signal detection circuit. According to claim 1,
The fingerprint detection mode section includes a charging section and a detection section,
During the charging period,
The gate driving circuit sequentially supplies a gate signal of a turn-on level voltage to the N gate lines,
the driving voltage supply circuit supplies the driving voltage to the Q data lines;
During the detection period,
The gate driving circuit sequentially supplies a gate signal of a turn-on level voltage to the N gate lines,
the driving voltage supply circuit does not supply the driving voltage to the Q data lines;
The fingerprint sensing circuit is electrically connected to the Q data lines to detect signals of the Q data lines. 15. The method of claim 14,
The fingerprint detection circuit comprises:
During the detection period,
A display device that supplies a reference voltage to the Q data lines before detecting the signals of the Q data lines. According to claim 1,
In each pixel area included in the first area,
a switching transistor controlled by a gate signal applied to a gate node through a corresponding gate line among the N gate lines and electrically connected between a corresponding data line among the Q data lines and a corresponding pixel electrode;
An optical sensor having both ends connected to a source node and a drain node of the switching transistor is disposed,
The display device further comprising a light irradiation device for irradiating light to the optical sensor. 17. The method of claim 16,
The fingerprint detection mode section includes a charging section and a detection section,
During the charging period,
The gate driving circuit sequentially supplies a gate signal of a turn-on level voltage to the N gate lines,
the driving voltage supply circuit supplies the driving voltage to the Q data lines;
During the detection period,
The light irradiation device irradiates light to the light sensor,
The gate driving circuit sequentially supplies a gate signal of a turn-on level voltage to the N gate lines,
the driving voltage supply circuit does not supply the driving voltage to the Q data lines;
The fingerprint sensing circuit is electrically connected to the Q data lines to detect signals of the Q data lines. delete delete delete According to claim 1,
a plurality of touch electrodes disposed on the display panel;
Further comprising a touch sensing circuit for driving at least one of the plurality of touch electrodes to detect the presence or absence of a touch by a finger or a touch object or touch coordinates,
The fingerprint detection circuit comprises:
according to the occurrence of a fingerprint detection event, setting the first area as a fingerprint detection area;
When a touch by a finger is detected in the first region set as the fingerprint sensing region by the touch sensing circuit,
A display device for detecting the fingerprint information in the first area. 22. The method of claim 21,
Until the occurrence of the fingerprint detection event, a display mode for displaying a normal image and a touch detection mode for detecting the presence or absence of a touch by a finger or a touch object or touch coordinates are time-divided or concurrently performed,
When the fingerprint detection event occurs, the first area is set as the fingerprint detection area, and a first fingerprint detection screen is displayed,
When a touch by the finger is sensed in the first area by the touch sensing circuit, the fingerprint information is sensed in the first area by the fingerprint sensing circuit, and the second fingerprint information is changed according to a detection result of the fingerprint information. A display on which a screen for fingerprint detection is displayed. According to claim 1,
A switching transistor for controlling application of the image data voltage is disposed in each pixel region,
During the charging section within the fingerprint detection mode section,
A gate signal of a turn-on level voltage is sequentially supplied to the N gate lines,
A driving voltage that is different from the image data voltage is supplied to the Q data lines,
During the detection section within the fingerprint detection mode section,
A gate signal of a turn-on level voltage is sequentially supplied to the N gate lines,
A display device in which the Q data lines are electrically connected to a fingerprint sensing circuit. K data lines (K is a natural number greater than or equal to 2) are arranged, H (H is a natural number greater than or equal to 2) gate lines are arranged, and a plurality of pixel areas defined by the K data lines and the H gate lines are A method of driving a display device comprising a display panel arranged in an array and in which pixel electrodes are disposed in each pixel area, the method comprising:
Fingerprint information is detected in an area including a pixel area defined by N (N is a natural number greater than or equal to 1) gate lines among the H gate lines and Q (Q is a natural number greater than or equal to) data lines among the K data lines. a fingerprint detection mode starting step of recognizing the occurrence of a start event for the fingerprint detection mode;
a charging step of sequentially supplying a gate signal having a turn-on level voltage to the N gate lines and supplying a driving voltage that is different from an image data voltage to the Q data lines; and
a sensing step of sequentially supplying a gate signal of a turn-on level voltage to the N gate lines and detecting the signals of the Q data lines,
the display device includes a timing control switch circuit for each of the Q data lines;
The timing control switch circuit comprises:
whether the corresponding data line and the driving voltage supply circuit are electrically connected;
whether the corresponding data line and the fingerprint detection circuit are electrically connected;
Controls whether the data line and the data driving circuit are electrically connected,
The timing control switch circuit comprises:
Operates according to the first control signal and the second control signal,
When the first control signal and the second control signal are at a first level,
controlling the image data voltage to be supplied to the data line by electrically connecting the data line and the data driving circuit;
When the first control signal is at a second level and the second control signal is at a first level,
controlling the driving voltage to be supplied to the data line by electrically connecting the data line and the driving voltage supply circuit;
When the first control signal is at a first level and the second control signal is at a second level,
By electrically connecting the corresponding data line and the fingerprint sensing circuit, the fingerprint sensing circuit is controlled to detect a signal of the corresponding data line;
When the first control signal is at a second level and the second control signal is at a second level,
A method of driving a display device by electrically connecting a corresponding data line and the fingerprint sensing circuit to control the fingerprint sensing circuit to supply a reference voltage to the corresponding data line. According to claim 1,
a first circuit for supplying a driving voltage to the Q data lines among the K data lines;
a second circuit for detecting the signals of the Q data lines and supplying a reference voltage to the Q data lines before detecting the signals of the Q data lines; and
a third circuit for supplying an image data voltage to the K data lines;
remind A display device in which selection of any one of the first circuit, the second circuit, and the third circuit is implemented by one of the timing control switch circuits. delete delete 26. The method of claim 25,
Further comprising the timing control switch circuit for each of the Q data lines,
The timing control switch circuit comprises:
Whether the data line is electrically connected to the first circuit, and
whether the corresponding data line and the second circuit are electrically connected;
Controls whether the data line and the third circuit are electrically connected,
A display device comprising one or more switch elements. According to claim 1,
and a fingerprint sensing circuit configured to sense fingerprint information by receiving a signal from a data line electrically connected to the pixel electrode through a switching transistor after a driving voltage is applied to the pixel electrode.

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