KR20190027495A - Display device, mobile informaion terminal including the display device and fingerprint recognition method using the display panel - Google Patents

Abstract

The present invention relates to a display device which comprises: a display panel driving only pixels within a partial area of a screen capable of fingerprint recognition in a specific driving mode; an image sensor facing the partial area of the screen; and a display panel driving circuit driving the pixels of the display panel. The brightness of the partial area of the screen is increased in the certain driving mode and a fingerprint on the partial area is recognized when the image sensor is driven.

Description

TECHNICAL FIELD [0001] The present invention relates to a mobile information terminal including a display device and a display device, and a fingerprint recognition method using the mobile information terminal and the fingerprint recognition method. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a display device capable of fingerprint recognition on the screen, a mobile information terminal including the display device, and a fingerprint recognition method.

An electroluminescent display device is classified into an inorganic light emitting display device and an organic light emitting display device depending on the material of the light emitting layer. An active matrix type organic light emitting display device includes an organic light emitting diode (OLED) which emits light by itself, and has a high response speed, a high luminous efficiency, a high brightness and a wide viewing angle There are advantages.

An OLED of an organic light emitting display includes an anode and a cathode, and an organic compound layer formed therebetween. The organic compound layer includes a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer EIL). When power is applied to the anode and the cathode, electrons passing through the hole transport layer (HTL) and the electron transport layer (ETL) move to the emission layer (EML) to form excitons. As a result, the emission layer (EML) .

The fingerprint sensor is disposed at a specific position outside the screen such as a home button. The fingerprint sensor placement method can be placed in a bezel area outside the screen, in which case the bezel area becomes larger. In order to arrange the fingerprint sensor on the display panel, the structure of the display panel may be changed.

A fingerprint sensor may be disposed on a liquid crystal display device (LCD). When a fingerprint sensor is disposed between a display panel and a backlight unit (BLU) in the screen area, a fingerprint sensor is displayed. The prism sheet of the backlight unit (BLU) has many air gaps in its structure. The reception efficiency of the fingerprint sensor is lowered due to the air layer, so that the fingerprint sensor can not be disposed under the screen area of the liquid crystal display device.

The present invention relates to a mobile information terminal including a display device and a display device capable of recognizing fingerprints on a screen and capable of quickly and accurately recognizing fingerprints in an always-on-display (AOD) to provide.

A display device of the present invention includes a display panel that displays an input image on a screen and drives only pixels within a partial area of a screen capable of fingerprint recognition in a specific drive mode, an image sensor that faces a part of the screen, And a display panel drive circuit for driving the pixels. A fingerprint on a partial area of the screen is recognized when the luminance of a part of the screen is increased in the specific driving mode and the image sensor is driven.

The mobile information terminal of the present invention includes a display panel displaying an input image on a screen and driving only pixels in a partial area of a screen capable of fingerprint recognition in a specific driving mode, an image sensor facing a part of the screen, A display panel driving circuit for driving the pixels; and a display panel driving circuit for driving the pixels in a certain area of the screen when sensing a fingerprint recognition event using any one of a touch sensor, an image sensor, And a host system for performing fingerprint authentication by comparing a fingerprint pattern of an image output from the image sensor with a fingerprint pattern of a user stored in advance.

According to the present invention, there is provided a fingerprint recognition method comprising: driving only pixels in a fingerprint-recognizable area on a screen in a specific driving mode; selecting one of a touch sensor, an image sensor and a pressure sensor, The method comprising the steps of: sensing a fingerprint recognition event using the image sensor; increasing a brightness of a portion of the screen; driving a plurality of image sensors opposed to a part of the screen to generate a fingerprint pattern of the image output from the image sensor; And fingerprint authentication is performed by comparing the fingerprint patterns of the fingerprint authentication device.

In the present invention, when light from pixels is reflected on a fingerprint pattern on the screen, the light can be detected by the image sensor and the fingerprint can be detected on the screen. In particular, the present invention can quickly and accurately recognize a fingerprint in the AOD drive mode by setting the AOD area in a fingerprint recognizable area in an always-on-display (AOD) driving mode in which only a part of the screen is driven. Since the fingerprint can be sensed on the screen on which the image is displayed, the icon of the application or the contents requiring the fingerprint authentication on the screen, or the execution / playback file, Access rights to applications, content, and files can be granted

According to the present invention, a fingerprint sensor integrated type electroluminescence display device can be implemented without disposing the image sensor on the back surface of the display panel and without changing the structure of the display panel or manufacturing process. Since the present invention does not require a fingerprint sensor on a bezel area or a groove button on the outside of the screen, it is advantageous in designing bezel reduction, waterproofing, and design freedom of the electroluminescence display device.

The present invention can display an AOD in an area capable of fingerprint recognition on the screen and detect a fingerprint on the AOD. The present invention can detect fingerprints without using a separate light source by using pixels in the AOD area as a light source.

1 is a block diagram showing a display device according to an embodiment of the present invention.
2 is a cross-sectional view showing a cross-sectional structure of a fingerprint sensor integrated type display panel according to the present invention.
3 is a diagram illustrating an example of an AOD area in which fingerprint recognition is possible on the screen of the mobile information terminal.
4 is a diagram illustrating an example in which an AOD area is emitted when a fingerprint recognition event is detected.
5 is a flowchart illustrating a fingerprint recognition method according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be noted that the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. These embodiments are provided so that the disclosure of the present invention is complete and that those skilled in the art will fully understand the scope of the present invention. The invention is defined by the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the description of the embodiments, the first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or wholly and technically various interlocking and driving are possible and that the embodiments may be practiced independently of each other, It is possible.

The display device of the present invention can be applied to a mobile information terminal. The mobile information terminal includes a mobile phone, a smart phone, a tablet computer, a notebook computer, and a wearable device. In order to reduce the power consumption in the standby mode (or sleep mode) or the locked state, the mobile information terminal stops driving the display device to reduce the power consumption. However, since the user restarts the mobile information terminal when viewing simple information such as a clock, it can be inconvenient to repeatedly turn on / off the mobile information terminal frequently. In order to reduce the inconvenience of the user, an AOD function for displaying information such as a date, a clock, and the like by driving only pixels located in a partial area of the screen in a standby mode or a locked state is set in the mobile information terminal. When the AOD function is activated, the mobile information terminal drives partial pixels only on the screen without displaying the entire screen, and always displays simple AOD information such as a date and a clock. If the AOD information is always displayed on the pixels at the same position, the deterioration of the pixels may proceed faster than the other pixels, and the afterimage may be seen. To improve this, the AOD area on the screen can be moved within a fingerprint recognition area. The present invention displays AOD information at a position where fingerprint recognition is possible on the screen, and displays images, symbols, characters, and the like, which guide the input of a fingerprint in the AOD area. The user can release the standby mode or the locked state of the mobile information terminal by inputting the fingerprint on the AOD area having a high fingerprint recognition rate. Therefore, according to the present invention, in the AOD driving mode in which only a part of the screen is driven, the AOD area can be set in the fingerprint recognizable area, and the fingerprint can be recognized quickly and accurately in the AOD driving mode.

In the following embodiments, the " AOD drive mode " means an operation state in which only pixels of a certain area capable of fingerprint recognition are driven on the screen of the display device, and pixels of the remaining screen area are not driven. Hereinafter, the " fingerprint recognition event " means a situation where the user attempts fingerprint recognition.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following embodiments, an electroluminescent display device will be described mainly with respect to an organic light emitting display device including an organic light emitting material. However, it should be noted that the technical idea of the present invention is not limited to the organic light emitting display, but can also be applied to an inorganic light emitting display device including an inorganic light emitting material.

1 is a block diagram showing a display device according to an embodiment of the present invention.

1, the display device of the present invention includes a display panel 100, a display panel drive circuit, a fingerprint sensor, and the like.

The display panel 100 includes a pixel array for displaying an input image on a screen AA. The pixel array includes a plurality of data lines 102, a plurality of gate lines 104 intersecting the data lines 102, and pixels arranged in a matrix. Each of the pixels may be divided into a red subpixel, a green subpixel, and a blue subpixel for color implementation. Each of the pixels may further include a white subpixel. Each of the subpixels 101 includes a pixel circuit.

Touch sensors may be disposed on the display panel 100. The touch input may be sensed using separate touch sensors or may be sensed through pixels. The touch sensors may be implemented as in-cell type touch sensors disposed on the screen of a display panel or embedded in a pixel array as an on-cell type or an add-on type .

The display panel 100 has a fingerprint sensor integrated structure as shown in FIG. 2 so that the fingerprint can be detected on the screen AA of the display panel 100. The fingerprint sensor includes pixels existing in the AOD region on the screen AA of the display panel 100 and an image sensor 300 disposed below the display panel 100 to face the AOD region. The AOD area is set at a position where fingerprint recognition is possible on the screen AA, opposite to the light receiving surface of the image sensor 300. [ When the AOD is displayed on the screen AA, the pixels in the AOD region are activated, while the pixels in the other regions other than the AOD region are inactivated. Accordingly, when the AOD is displayed on the screen, only the pixels within the AOD area are driven.

The display device of the present invention may further include a pressure sensor (310). The pressure sensor 310 may be installed in the vicinity of the image sensor 300 as shown in FIG. 2 to sense the pressure of the finger contacting the AOD region.

The display panel driving circuit activates the pixels of the entire screen AA in the normal driving mode to write the pixel data of the input image and displays the input image on the screen of the display panel 100. [ The pixels of the display panel 100 include a self-luminous element, for example, an organic light-emitting diode (OLED). The OLED includes an anode and a cathode, and an organic compound layer formed between the electrodes. The organic compound layer includes a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer EIL). ≪ / RTI >

The display panel driving circuit drives only pixels in the AOD area in the AOD driving mode under the control of the timing controller (TCON) 130 to display data of AOD information preset in the pixels in the AOD area. Therefore, only the pixels in the AOD region are activated in the AOD driving mode, and the pixels other than the AOD region are inactive because they are not driven.

The display panel drive circuit includes a data driver 110 and a gate driver 120. A demultiplexer 112 may be disposed between the data driver 110 and the data lines 102. The display panel drive circuit may further include a touch sensor driver for driving the touch sensors. The touch sensor driving unit is omitted in Fig. In the mobile device, the display panel drive circuit, the timing controller 130, and the power supply circuit (not shown) can be integrated in one drive IC.

The data driver 110 converts digital data of an input image received from the timing controller 130 into an analog gamma compensation voltage every frame period using a digital-to-analog converter (DAC) And outputs a voltage. The data voltage is applied to the pixels through the demultiplexer 112 and the data line 102. The demultiplexer 112 is disposed between the data driver 110 and the data lines 102 using a plurality of switch elements and distributes the data voltages output from the data driver 110 to the data lines 102. The number of data lines 102 can be reduced because one channel of the data driver 110 is time-division-connected to the plurality of data lines by the demultiplexer 112.

The gate driver 120 may be implemented as a gate in panel (GIP) circuit formed directly on a bezel region on the display panel 100 together with TFTs (thin film transistors) and wirings of the pixel array. The gate driver 120 outputs a gate signal to the gate lines 104 under the control of the timing controller 130. The gate driver 120 may sequentially shift the gate signals to the gate lines 104 by shifting the gate signals using a shift register. The gate signal may include a scan signal, an emission signal, and the like, which are not shown. The scan signal is synchronized with the data signal. The emission signal defines the emission time of the pixels.

The timing controller 130 receives digital video data (DATA) of an input image from the host system 200 and a timing signal synchronized with the digital video data (DATA). The timing signal may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a clock and a data enable signal DE.

The host system 200 transmits the pixel data and the timing signal of the input image to the timing controller 130. The host system 200 may be an AP (Application Processor) of the mobile information terminal, but is not limited thereto. Various sensors may be connected to the host system 200. For example, the host system 200 may be connected to the proximity sensor 320 and may be connected to an illuminance sensor, a gyro sensor, etc., not shown.

The timing controller 130 generates a data timing control signal for controlling the operation timing of the data driver 110 based on the timing signals Vsync, Hsync and DE received from the host system 200, the operation timing of the demultiplexer 112 And a gate timing control signal for controlling the operation timing of the gate driver 120 to control the operation timing of the display panel drive circuit 100. [ The gate timing control signal output from the timing controller 130 may be supplied to the gate driver 120 through a level shifter omitted in FIG. The level shifter converts the low level voltage of the gate timing control signal to the gate low voltage VGL and converts the high level voltage of the gate timing control signal to the gate high voltage VGH .

2 is a cross-sectional view showing a cross-sectional structure of a fingerprint sensor integrated type display panel according to the present invention.

Referring to FIG. 2, the transparent substrate 110 may be covered on the entire surface of the display panel 100. The transparent substrate 110 may be a cover glass. The fingerprint of the user can be contacted on the transparent substrate 110 on the screen of the display panel 100. [

The image sensor 300 and the pressure sensor 310 may be disposed on the back surface of the display panel 100. [ The pressure sensor 310 may be disposed in the vicinity of the image sensor 300. The host system 200 can determine the fingerprint recognition event using the pressure sensor 310, the touch sensor, and the image sensor disposed in the AOD area or the vicinity thereof. For example, when the AOD area is touched or the illuminance of the AOD area is lowered in the AOD driving mode, or when the AOD area is pressed by the finger, this situation can be determined as a fingerprint recognition event. The host system 200 can determine the touch input of the AOD area with the touch sensor and determine the pressure change of the AOD area with the pressure sensor 310. [ A change in illumination on the AOD area can be detected by the image sensor 300. [ Accordingly, the host system 200 can determine the illuminance of the AOD area by the image sensor 300 in the AOD drive mode. In the AOD driving mode, when the user's finger approaches the AOD area, the light received by the image sensor 300 is lowered, so that the illuminance of the AOD area is lowered. The host system 200 compares the fingerprint pattern image received from the image sensor 300 with the fingerprint pattern of the user stored in advance when the fingerprint recognition event is detected and performs the fingerprint authentication process.

On the screen AA, the AOD area is set to a predetermined size on the image sensor 300 to enable fingerprint recognition. The image sensor 300 faces the pixels of the AOD region on the screen AA. When the fingerprint recognition event is detected, the display panel driving circuit detects the fingerprint pattern by emitting pixels of the AOD area in which the fingerprint pattern is in contact. At this time, the pixels of the AOD region can emit light of a high-luminance white light, green light, or blue light to be AOD regions. Therefore, when a fingerprint recognition event is generated in the AOD driving mode, the pixels in the AOD region operate as a light source for sensing a fingerprint pattern. When a fingerprint recognition event is detected, pixels other than the AOD area remain inactive and are not driven, so that the remaining area except for the AOD area on the screen AA is black.

The image sensor 300 may be adhered to the back surface of the display panel 100 with an adhesive 301. The adhesive 301 can be selected as OCA (Optical Clear Adhesive) having high light transmittance. A foam pad and a metal layer 111 may further be adhered to the back surface of the substrate of the display panel 100. [ The image sensor 300 is mounted on the rear surface of the display panel 100 exposed by the holes of the foam pad and the metal layer 111 in order to increase the light receiving efficiency of the image sensor 300 and reduce the thickness of the display device. Can be adhered.

When the fingerprint recognition event is detected, when the pixels of the AOD region are lit, the light from the pixels is reflected from the ridge R of the fingerprint and is received by the photosensor pixels of the image sensor 300, (Valley, V). Each of the photosensor pixels of the image sensor 300 converts light reflected from the ridge R of the fingerprint into a voltage using a photosensor that converts light into an electrical signal, amplifies the voltage, and converts the amplified voltage into digital data . The host system 200 compares the fingerprint pattern data detected in real time with the user fingerprint pattern stored in advance by the image sensor 300, and performs a fingerprint authentication process for determining whether the fingerprint pattern matches or not. Through this fingerprint authentication procedure, it is determined whether the fingerprint that is detected in real time is the fingerprint of the user who is permitted to access.

The image sensor 300 preferably operates in the power saving mode so that power consumption is not increased in the AOD driving mode. Since the power saving mode of the image sensor 300 is various known methods, a detailed description thereof will be omitted. When a fingerprint recognition event is detected, the host system 200 may generate an interrupt signal to increase the brightness of the pixels of the AOD area and the brightness of the image sensor 300 to the normal driving mode. The display panel driving circuit wakes up when an interrupt signal is received from the host system 200 and operates in the normal driving mode to increase the pixel brightness of the AOD area. The image sensor 300 wakes up in response to an interrupt signal from the host system 200 and operates in the normal drive mode. When the image sensor 300 operates in the normal driving mode, the power consumption may be increased as compared with the power saving mode.

The display device of the present invention can implement a screen of a mobile information terminal as in the example of FIG. 3 and FIG.

3 is a diagram illustrating an example of an AOD area in which fingerprint recognition is possible on the screen of the mobile information terminal.

3, the mobile information terminal of the present invention displays AOD information set in advance in the AOD area 150 in the AOD driving mode and controls the pixels in the inactive state in other screens than the AOD area 150. [ Accordingly, the display device of the mobile information terminal can reduce the power consumption while displaying the AOD information in the AOD area 150 in the AOD driving mode.

The AOD area 150 is assigned a fingerprint-recognizable position overlapping the image sensor 300 on the screen AA. An image, a symbol, and a character that intuitively notifies the fingerprint recognition position are displayed in the AOD area so that the user can place the fingerprint on the AOD area 150 when the AOD area 150 is driven on the screen AA . The image that guides the fingerprint contact may be an image in the form of an icon, but is not limited thereto. The position of the AOD region 150 may be moved for other purposes or to disperse the deterioration of the pixels, but is moved within a fingerprint-recognizable region. The AOD area 150 may be moved every predetermined time period.

4 is a diagram illustrating an example in which an AOD area is emitted when a fingerprint recognition event is detected.

When the touch input, the illumination change, and the pressure change occur in the AOD area 150 in the AOD driving mode, the host system 200 detects the fingerprint recognition event. When the fingerprint recognition event is detected, the host system 200 emits the pixels in the AOD area 150 with predetermined brightness to detect the fingerprint pattern. At this time, the pixels to be emitted may be all the pixels in the AOD region or all the pixels in the local region preset in the AOD region as the fingerprint recognition region.

5 is a flowchart illustrating a fingerprint recognition method according to an embodiment of the present invention.

Referring to FIG. 5, the mobile information terminal detects a fingerprint recognition event when a touch input occurs, a pressure change occurs, or illumination changes in the AOD area 150 of the screen AA (S1).

The mobile information terminal confirms whether the current driving state of the mobile information terminal is the AOD driving mode when the fingerprint recognition event is detected. This is to prevent erroneous operation of the mobile information terminal and unnecessary power consumption when it is estimated as a fingerprint recognition event. For example, a fingerprint recognition event can be detected when a mobile phone or a smartphone enters a user's pocket. In such a situation, it is necessary to check whether the current driving state of the mobile information terminal is the AOD driving state so as not to perform the fingerprint recognition operation.

The host system 200 can use the proximity sensor 320 to check whether the current state of the mobile information terminal is the AOD driving state (S2). When the object approaches the predetermined distance or less on the screen of the mobile information terminal, the mobile information terminal does not operate in the AOD driving mode and all subpixels on the screen can be inactivated. This situation can occur when a user places a smartphone near the cheek or puts a smartphone in a pocket or bag to make a call. The host system 200 analyzes the signal of the proximity sensor 320 when the fingerprint recognition event is detected, and checks whether the AOD of the mobile information terminal is driven. When the object approaches the screen of the mobile information terminal, the host system 200 does not start the fingerprint recognition but maintains the current AOD drive mode.

The pixels in the AOD area 150 do not emit light at a high luminance but display the AOD information at a low luminance until the fingerprint recognition starts in the AOD drive mode, and the image sensor 300 operates in the power saving mode. Therefore, in the AOD driving mode, the display device operates in the power saving mode and its power consumption is kept low.

When it is determined in S2 that the fingerprint recognition event is generated in the AOD driving mode, the pixels in the AOD area 150 emit with high brightness, the image sensor 300 operates in the normal driving mode and the fingerprint sensor operates (S3 and S4) S4).

The host system 200 compares a fingerprint pattern of an image output from the image sensor 300 with a fingerprint pattern of a user stored in advance and performs fingerprint authentication. When the fingerprint pattern detected in real time by the fingerprint sensor of the display panel is the same as the preset fingerprint pattern of the user, the standby mode or the locked state of the mobile information terminal is released (S6). On the other hand, if the fingerprint pattern sensed in real time by the fingerprint sensor of the display panel differs from the fingerprint pattern of the user, the authentication is refused and the AOD drive mode is resumed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: display panel AA: display panel screen
150: AOD area 300: Image sensor
310: pressure sensor 320: proximity sensor

Claims (11)

A display panel that displays an input image on a screen and drives only pixels within a partial area of a screen capable of fingerprint recognition in a specific drive mode;
An image sensor facing a part of the screen; And
And a display panel drive circuit for driving the pixels of the display panel,
Wherein a luminance of a partial area of the screen is increased in the specific driving mode and a fingerprint on a partial area of the screen is recognized when the image sensor is driven. The method according to claim 1,
Wherein a part of the screen is moved within the fingerprint recognizable area. The method according to claim 1,
Wherein the normal mode is operated when the image sensor operates in a power saving mode in a specific driving mode and brightness is increased in a part of the screen. The method according to claim 1,
Wherein one of an image, a symbol, and a character that guides a user's fingerprint contact is displayed on a part of the screen in the specific drive mode. A display panel that displays an input image on a screen and drives only pixels within a partial area of a screen capable of fingerprint recognition in a specific drive mode;
An image sensor facing a part of the screen;
A display panel driving circuit for driving the pixels of the display panel; And
When detecting a fingerprint recognition event using any one of a touch sensor, an image sensor, and a pressure sensor located in the vicinity of the partial region in the specific driving mode, brightness is increased in a partial area of the screen, And a host system for performing fingerprint authentication by comparing a pattern and a fingerprint pattern of a user stored in advance. 6. The method of claim 5,
Wherein a part of the screen is moved within the fingerprint recognizable area. 6. The method of claim 5,
The host system comprising:
When the fingerprint recognition event is detected, the proximity sensor is used to check whether the screen operates in a specific driving mode,
When the fingerprint recognition event is detected, when the screen is driven in the specific driving mode, an interrupt signal is generated to change the brightness in a part of the screen and switch the driving mode of the image sensor. 8. The method of claim 7,
Wherein the display panel driving circuit raises the brightness of pixels existing in a part of the screen in response to the interrupt signal,
Wherein the image sensor switches from the power saving mode to the normal drive mode in response to the interrupt signal. 6. The method of claim 5,
Wherein one of an image, a symbol, and a character that guides a user's fingerprint contact is displayed on a part of the screen in the specific driving mode. Driving only pixels within a certain area of the fingerprint recognition area on the screen in the specific driving mode;
Sensing a fingerprint recognition event using any one of a touch sensor, an image sensor, and a pressure sensor located near the partial region in the specific driving mode;
Increasing brightness in a part of the screen; And
And performing a fingerprint authentication by driving an image sensor facing a part of the screen to compare a fingerprint pattern of an image output from the image sensor with a fingerprint pattern of a user stored in advance. 11. The method of claim 10,
Further comprising checking whether the fingerprint recognition event is detected using the proximity sensor when the fingerprint recognition event is detected.

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