CN113767413A

CN113767413A - Display device including fingerprint authentication sensor and laminate used therein

Info

Publication number: CN113767413A
Application number: CN202080032439.6A
Authority: CN
Inventors: 竹厚流; 山越静人
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2019-05-09
Filing date: 2020-03-31
Publication date: 2021-12-07
Also published as: KR20220009972A; WO2020226007A1; TW202105011A; JPWO2020226007A1

Abstract

The present invention addresses the problem of providing a display device including a fingerprint authentication sensor and a laminate used in the display device, which can contribute to further slimness of the display device while suppressing an increase in the size of a frame region. A display device (1) is provided with: a display element provided on a predetermined surface of the display region layer (40) of the laminate (110) and used for displaying an image; a fingerprint authentication sensor that is provided on the same predetermined surface (40) as the display element and detects an image of a fingerprint used for fingerprint authentication at a position where display of the display element is performed; and an integrated circuit (200) which is a processing unit that performs processing for fingerprint authentication using the image detected by the fingerprint authentication sensor.

Description

Display device including fingerprint authentication sensor and laminate used therein

Technical Field

The present invention relates to a display device including a fingerprint authentication sensor and a laminate used therein.

Background

Private information data such as personal information and business secrets is stored in a portable terminal such as a notebook personal computer, a tablet terminal, and a smartphone, and the portable terminal needs to be provided with a security system for guarding the data. As a security system, a fingerprint authentication sensor is known that uses a fingerprint of a human finger to strengthen security. A fingerprint authentication sensor is a sensor that senses the fingerprint of a finger.

The fingerprint authentication sensor is generally disposed outside a screen on which a video image is displayed in the portable terminal, and is disposed, for example, in a HOME button or the like. This increases the frame area outside the screen, and correspondingly decreases the screen size of the mobile terminal.

As a means for disposing a fingerprint authentication sensor in an area within a screen, patent document 1 discloses a display device in which a fingerprint authentication sensor is disposed below a display panel.

Documents of the prior art

Patent document

Patent document 1: JP patent publication 2018-85114

Disclosure of Invention

Problems to be solved by the invention

An object of one embodiment of the present invention is to provide a display device including a fingerprint authentication sensor and a laminate used in the display device, which can suppress an increase in the size of a frame region and contribute to further slimness of the display device.

Means for solving the problems

In order to achieve the above object, a display device according to an embodiment of the present invention includes: a display element provided on a given surface and used for displaying an image; a fingerprint authentication sensor that is provided on the same predetermined surface as the display element and detects an image of a fingerprint used for fingerprint authentication at a position where display of the display element is performed; and a processing unit that performs a fingerprint authentication process using the image detected by the fingerprint authentication sensor.

In order to achieve the above object, a display device according to an embodiment of the present invention includes: a display area layer having a display element for displaying a video image and a fingerprint authentication sensor for detecting an image of a fingerprint used for fingerprint authentication at a position where the display element is displayed; and a processing unit that performs a fingerprint authentication process using the image detected by the fingerprint authentication sensor.

In order to achieve the above object, a laminate for a display device according to an embodiment of the present invention includes: a display element provided on a given surface and used for displaying an image; and a fingerprint authentication sensor that is provided on the same given surface as the display element and detects an image of a fingerprint used in fingerprint authentication at a position where display of the display element is performed.

In order to achieve the above object, a laminate for a display device according to an embodiment of the present invention includes a display region layer including: a display element for displaying an image; and a fingerprint authentication sensor that detects an image of a fingerprint used for fingerprint authentication at a position where the display of the display element is performed.

ADVANTAGEOUS EFFECTS OF INVENTION

In one embodiment of the present invention, the fingerprint authentication sensor and the display element for displaying an image are disposed on the same surface or display area layer, whereby an increase in the size of the frame area is suppressed, and a slim display device can be provided. In addition, the embodiment of the present invention is convenient because the fingerprint can be sensed in the screen on which the image is displayed.

Drawings

Fig. 1 is a schematic diagram showing a display device according to embodiment 1, embodiment 2, and embodiment 3 of the present invention.

Fig. 2 is a schematic diagram showing a display region layer in embodiment 1 of the display device of the present invention.

Fig. 3 is a schematic diagram showing a display region layer in embodiment 2 of the display device of the present invention.

Fig. 4 is a schematic diagram showing a display region layer in embodiment 3 of the display device of the present invention.

Fig. 5 is a schematic diagram showing the display device according to embodiment 1, embodiment 2, embodiment 3, and embodiment 4 of the present invention.

Fig. 6 is a schematic diagram showing a display region layer in embodiment 4 of the display device of the present invention.

Detailed Description

The display device of the present invention is applicable to a self-luminous display device such as an inorganic EL display device and an organic EL display device, and is applicable to an organic EL display device, for example.

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiments, an example of an organic EL display device will be mainly described as one of display devices.

Fig. 5 schematically shows a display device 1 according to embodiment 1. The display device 1 is a device capable of displaying images, such as a tablet terminal or a smartphone. In addition, the display device 1 can perform fingerprint authentication of the user. The fingerprint authentication of the user can be performed at the same timing and for the same purpose as those of the conventional apparatuses, such as at the start of use of the display apparatus 1 of the user.

As shown in fig. 5, the display device 1 includes a laminate 110 and an integrated circuit 200 as a configuration for displaying images and authenticating a user's fingerprint. The portion of the laminate 110 in fig. 5 is a cross-sectional view showing the side surfaces of the

layers

10, 20, 30, 40, 50 constituting the laminate 110. The display device 1 may be generally configured as a device such as a tablet terminal or a smartphone.

The stack 110 is a module that constitutes a display screen for displaying an image and detects a fingerprint of a finger of a user. The integrated circuit 200 is a module (device) for performing information processing for fingerprint authentication of a user. As the integrated circuit 200, the same integrated circuit as that used in an existing device can be used. The integrated circuit 200 is fixedly disposed in a housing (not shown) of the display device 1, for example, on the back side of the laminate 110.

The laminate 110 has the layers of the transparent plate 10, the polarizing film 30, the display region layer 40, and the back sheet 50. The transparent plate 10 side is a layer toward the outside of the display device 1. The transparent plate 10 and the polarizing film 30 may be adhered by an adhesive layer 20. Each of the

layers

10, 20, 30, 40, and 50 constituting the laminate 110 has a shape of a display screen for displaying an image when viewed from the laminating direction, and is, for example, rectangular.

Fig. 2 is a schematic view of the display region layer 40 according to embodiment 1, as viewed from above the laminate 110 in fig. 5. A plurality of

display elements

401, 402, 403 and a plurality of fingerprint authentication sensors 404 are provided on the display area layer 40. The 1

display elements

401, 402, and 403 correspond to 1 pixel constituting a display screen. In the display area layer 40, the fingerprint authentication sensor 404 and the

display elements

401, 402, 403 are present on the same side. By having them on the same plane, a display device 1 of fine fibers can be obtained. The fingerprint authentication sensors 404, the

display elements

401, 402, and 403, and the integrated circuit 200 are electrically connected to each other by wiring. Power for driving the fingerprint authentication sensors 404 and the

display elements

401, 402, and 403 is supplied from the integrated circuit 200 via this connection. Further, information is transmitted and received via the connection.

In the case where the transparent plate 10 and the polarizing film 30 are not provided, that is, even in the case of a display device having the display region layer 40 and the back plate 50, the display device can function as a display device including the fingerprint authentication sensor 404, and a display device with a finer size can be obtained. The display device 1 may have a transparent plate 10 from the viewpoint of stability over time and life. In addition, the display device 1 may have a polarizing film 30 from the viewpoint of reflection prevention of external light.

Where the transparent plate 10 contacts the fingerprint of the user's finger. When the fingerprint authentication sensor 404 is present in the display area layer 40, the fingerprint is sensed in the display screen on which the image is displayed, and the fingerprint pattern can be recognized.

The

display elements

401, 402, and 403 are elements for displaying images. As the

display elements

401, 402, and 403, for example, an OLED (Organic Light Emitting Diode) can be used. The

display elements

401, 402, and 403 emit light, that is, emit light. The emitted light travels to the transparent plate 10 and is emitted to the outside of the display device 1, and the user can recognize the emitted light. The

display elements

401, 402, 403 can for example emit blue, red or green light. The I-th, 2 nd, and 3

rd display elements

401, 402, and 403 emit, for example, blue, green, and red light, respectively. As shown in fig. 2, the fingerprint authentication sensor 404 and the

display elements

401, 402, 403 are alternately arranged. Specifically, for example, the plurality of

display elements

401, 402, and 403 and the fingerprint authentication sensor 404 are arranged vertically with a slight interval, and the columns thereof are arranged horizontally with a slight interval in the order of the display element 401, the display element 402, the display element 403, and the fingerprint authentication sensor 404. By alternately arranging them, the uniformity of fingerprint sensing of the entire screen increases. The

display elements

401, 402, and 403 are, for example, a stacked structure including a cathode, an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer, and an anode, and are normally driven by the integrated circuit 200.

The transparent plate 10 may be a transparent film or a transparent glass. When a transparent thin film is used as the transparent plate 10, a flexible display can be obtained. The obtained flexible display is excellent in flexibility because it is slimmed.

The back plate 50 may be a PI (Polyimide) film substrate. In the back plate 50, a multi-layer buffer film may be formed using an insulating material. In addition, wiring for supplying power and signals to the display region layer 40 may be formed on the rear plate 50. The back sheet 50 may further have a PET (Polyethylene terephthalate) substrate. The back sheet 50 can block moisture from penetrating so that the display area layer 40 is not exposed to moisture, and in addition, can support the display area layer 40. The display device 1 of the present invention can be a flexible display because the back plate 50 has flexibility.

The polarizing film 30 blocks reflection of external light on the display area layer 40, thereby improving outdoor visual recognizability. The polarizing film 30 may comprise a circular polarizer (or λ/4 plate). The adhesive layer 20 for bonding the polarizing film 30 and the transparent plate 10 may be an Optical adhesive (OCA), for example.

The

display elements

401, 402, and 403 are arranged in a matrix, and are electrically connected to data lines and gate lines intersecting the data lines, thereby emitting light and providing an input image. The data line is connected to the integrated circuit 200 and receives a data signal from the integrated circuit 200.

A fingerprint authentication sensor 404 is mounted within the display area layer 40. The fingerprint authentication sensor 404 is a sensor for detecting an image of a fingerprint used in fingerprint authentication. The fingerprint authentication sensor 404 detects the fingerprint of a user's finger touching or in proximity to the transparent sheet 10. That is, the fingerprint authentication sensor 404 detects a fingerprint at a position where the

display elements

401, 402, and 403 are displayed.

The plurality of fingerprint authentication sensors 404 are substantially not entirely fixedly disposed within the display area layer 40. Each fingerprint authentication sensor 404 detects a fingerprint of a finger of the user corresponding to the arranged position. By combining the detection results from the plurality of fingerprint authentication sensors 404, an image of the fingerprint of the user's finger is formed. The fingerprint authentication sensor 404 may be disposed at a position of a part of the display area layer 40, not the entire display area layer 40. As the fingerprint authentication sensor 404, for example, an optical fingerprint authentication sensor that optically detects an image of a fingerprint can be used. The optical fingerprint authentication sensor 404 outputs the detection result to the integrated circuit 200.

The optical fingerprint authentication sensor 404 receives light reflected from a fingerprint, and detects a fingerprint pattern using a difference in the amount of light reflected from the Ridge and Valley (Valley) of the fingerprint. As the light reflected by the fingerprint detected by the optical fingerprint authentication sensor 404, light emitted by the

display elements

401, 402, 403 can be used. However, light other than the

display elements

401, 402, and 403 may be a detection target of the optical fingerprint authentication sensor 404. In this case, a light source of the light is provided in the display device 1. The light-receiving surface of the optical fingerprint authentication sensor 404 faces the transparent plate 10, and detects the reflected light. As the optical fingerprint authentication sensor 404, for example, an image sensor using a PD (Photo Diode) such as a CCD (Charge Coupled Device) or a CIS (CMOS image sensor) can be used.

The fingerprint authentication sensor 404 may be an ultrasonic fingerprint authentication sensor 404 that detects an image of a fingerprint by ultrasonic waves. In this case, the display device 1 is provided with an ultrasonic transmitter (which may be included in the ultrasonic fingerprint authentication sensor) for generating ultrasonic waves and transmitting the ultrasonic waves to the transparent plate 10. The ultrasonic fingerprint authentication sensor 404 analyzes ultrasonic waves reflected at a Ridge (Ridge) and a Valley (Valley) of a fingerprint to detect a fingerprint pattern. The ultrasonic wave receiving surface of the ultrasonic fingerprint authentication sensor 404 faces the fingerprint contacting the transparent plate 10.

The back plate 50 may have a Foam pad (Foam pad) and a metal layer. The foam pad is made of foamed resin (foamed resin) and absorbs vibration and impact. The metal layer is a metal for shielding electromagnetic interference (EMI), such as a Cu layer.

The integrated circuit 200 is a processing unit that performs fingerprint authentication processing using an image detected by the fingerprint authentication sensor 404. The integrated circuit 200 generates an image of the fingerprint based on the input from each fingerprint authentication sensor 404. The integrated circuit 200 performs a process of fingerprint authentication using the generated image of the fingerprint. The above-described processing in the integrated circuit 200 can be performed in the same manner as in the conventional optical fingerprint authentication. For example, the integrated circuit 200 stores information for performing fingerprint authentication (for example, information of a fingerprint of a user to be authenticated), and performs fingerprint authentication using the stored information. The result of fingerprint authentication may be used in the same manner as in a conventional device having a fingerprint authentication function.

The integrated circuit 200 converts data of an input video input to or generated in the display device 1 into a data signal, and outputs the data signal to the data lines of the

display elements

401, 402, and 403, thereby driving the

display elements

401, 402, and 403. The above and later described functions of the integrated circuit 200 do not need to be performed in 1 integrated circuit 200. The display device 1 includes a plurality of integrated circuits 200, and functions may be implemented by any of the integrated circuits 200.

The fingerprint detection and fingerprint authentication by the fingerprint authentication sensor 404 need not be performed at all times, and may be performed at a specific timing as follows. For example, the display device 1 may have a video display mode and a fingerprint authentication mode. For example, the fingerprint authentication sensor 404 may not be driven in the video display mode, and the fingerprint authentication sensor 404 may be driven in the fingerprint authentication mode. That is, the fingerprint authentication sensor 404 may function as a fingerprint authentication sensor only at a given timing. This control is performed by, for example, the integrated circuit 200.

The display device 1 further includes a contact sensor for detecting contact or proximity of an object to a position where the fingerprint is detected by the fingerprint authentication sensor 404 in the display device 1, and the fingerprint authentication sensor 404 can detect an image of the fingerprint by using the contact or proximity of the object detected by the contact sensor as a trigger. The display device 1 may include a touch sensor array (not shown) as a contact sensor between the transparent plate 10 and the display region layer 40, for example. That is, the display device 1 may have a function of a touch panel. As the touch sensor array, a structure similar to that of the past can be used in which contact or approach of an object is detected by capacitance. The touch sensor array is electrically connected to the integrated circuit 200 by, for example, wiring, and driven by the integrated circuit 200. The touch sensor array senses contact or proximity of an object to the surface of the transparent plate 10, i.e., a touch input. When the touch sensor array senses a touch input, it notifies the integrated circuit 200 of the sense.

The integrated circuit 200 may not drive the fingerprint authentication sensor 404 (for example, supply no power for driving) when the touch sensor array does not sense the touch input, and may drive the fingerprint authentication sensor 404 (for example, supply power for driving) when the touch sensor array senses the touch input. Thus, the fingerprint authentication sensor 404 detects an image of a fingerprint only when the touch sensor array senses the fingerprint. That is, the fingerprint authentication sensor 404 detects an image of a fingerprint using a case where contact or approach of an object to the transparent plate 10 is detected as a trigger. Alternatively, the fingerprint authentication sensor 404 may detect an image of a fingerprint when a button provided in the display device 1 is pressed.

In addition, the fingerprint authentication sensor 404 may detect an image of a fingerprint every fixed time. That is, the fingerprint authentication sensor 404 may function as a fingerprint authentication sensor in time division. In this case, the time for which the fingerprint authentication sensor functions may be 0.02 seconds or less per sensing of a fingerprint. By setting the time to this range, fingerprint authentication can be performed at a level that cannot be visually recognized by the user. The time may be further 0.01 seconds or less, or 0.005 seconds or less.

The

display elements

401, 402, and 403 can display for fingerprint detection at the timing when the image of the fingerprint is detected by the fingerprint authentication sensor 404. In the fingerprint authentication mode in which the fingerprint authentication sensor 404 is driven, the

display elements

401, 402, and 403 may emit light for fingerprint detection to the transparent plate 10, and the fingerprint authentication sensor 404 may detect reflected light generated by the reflection of the light in the transparent plate. In this case, the light emitted from the

display elements

401, 402, and 403 may be monochromatic light. The light emission of each color can be realized by any one of blue, red, and green, or a combination of the amounts of light emission thereof. In particular, light of a wavelength (for example, red) having high detection sensitivity of the fingerprint authentication sensor 404 can be emitted to reduce the influence of external light. This can improve the S/N ratio in detection by the fingerprint authentication sensor 404.

As described above, in the present embodiment, the fingerprint authentication sensor 404 and the

display elements

401, 402, and 403 for displaying video images are disposed on the same surface. For this reason, it is not necessary to separate the display screen and the area where fingerprint authentication is performed in the display device 1. This can suppress an increase in the size of the frame region, and provide a slim display device 1. In addition, the display device 1 according to the present embodiment is convenient because it can sense a fingerprint on a display screen displaying a video. In the present embodiment, since the fingerprint authentication sensor 404 is disposed in the display area layer 40, the distance between the fingerprint contacting the transparent plate 10 and the fingerprint authentication sensor 404 is short. Thereby improving the ultrasonic or light receiving efficiency of the fingerprint authentication sensor 404 and improving the fingerprint sensing performance.

Further, the laminate 110 according to the present embodiment can provide a slim display device 1 while suppressing an increase in the size of the frame region. The laminate 110 may include the

display elements

401, 402, and 403 and the fingerprint authentication sensor 404 provided on the same surface, and may have a configuration other than the above configuration. Alternatively, the fingerprint authentication sensor 404 and the

display elements

401, 402, and 403 may be disposed on the display area layer 40.

As in the present embodiment, the fingerprint authentication sensor 404 and the

display elements

401, 402, and 403 may be alternately arranged on a predetermined surface, i.e., the display area layer 40. With this configuration, it is possible to appropriately detect the fingerprint image and display the video. However, the fingerprint authentication sensor 404 and the

display elements

401, 402, and 403 need not be alternately arranged, and may be arranged so that an image of a fingerprint can be detected and a video can be displayed.

As in the present embodiment, a contact sensor (for example, the above-described touch sensor array) for detecting contact or proximity of an object to a position on the display device 1 where a fingerprint is detected may be provided, and the fingerprint authentication sensor 404 may detect an image of the fingerprint using the detection of contact or proximity of the object as a trigger. According to this configuration, the image of the fingerprint can be detected only when necessary, the image of the fingerprint can be efficiently detected and the video can be displayed, and power consumption can be reduced.

As in the present embodiment, the fingerprint authentication sensor 404 may detect an image of a fingerprint every fixed time. According to this configuration, as described above, it is possible to efficiently detect an image of a fingerprint and display a video, and to reduce power consumption.

As in the present embodiment, the

display elements

401, 402, and 403 may display the image for fingerprint detection at the timing when the fingerprint authentication sensor 404 detects the image of the fingerprint. According to this configuration, the image of the fingerprint can be detected appropriately and reliably, and as a result, the fingerprint authentication of the user can be performed appropriately and reliably. As described above, the display device 1 and the laminate 110 according to embodiment 1 are provided.

Next, a display device 1 and a laminate 110 according to embodiment 2 of the present invention will be described. The display device 1 and the laminate 110 according to embodiment 2 are the same as the display device 1 and the laminate 110 according to embodiment 1, except for the points described below. In embodiment 1, the

display elements

401, 402, and 403 and the fingerprint authentication sensor 404 are separately configured and arranged, but in this embodiment, the fingerprint authentication sensor is integrated with a part of the display element. That is, the display element can operate as a fingerprint authentication sensor (or alternatively, the fingerprint authentication sensor can operate as a display element). The fingerprint authentication sensor and the display element are integrated, for example, by disposing the fingerprint authentication sensor in the display element. Alternatively, the composition constituting the display element and the composition constituting the fingerprint authentication sensor may be the same.

Fig. 3 is a schematic view of the display region layer 40 according to embodiment 2, as viewed from above the laminate 110 in fig. 5. The display area layer 40 in embodiment 2 is provided with a plurality of

display elements

4014, 4024, 4034 in which fingerprint authentication sensors are integrated. Specifically, the display element 401 and the display element 4014 in which the display element 401 and the fingerprint authentication sensor are integrated are alternately arranged in the vertical direction with a minute interval. Similarly, the display element 402 and the display element 4024 integrating the display element 402 and the fingerprint authentication sensor are alternately arranged in the vertical direction with a slight interval, and the display element 403 and the display element 4034 integrating the display element 403 and the fingerprint authentication sensor are alternately arranged in the vertical direction with a slight interval. Their columns are arranged laterally in sequence with a slight spacing. In embodiment 2, since the fingerprint authentication sensor is integrated with the display element, the resolution of the image display area is improved compared to that of embodiment 1. The above description is of the display device 1 and the laminate 110 according to embodiment 2.

Next, a display device 1 and a laminate 110 according to embodiment 3 of the present invention will be described. The display device 1 and the laminate 110 according to embodiment 3 are the same as the display device 1 and the laminate 110 according to embodiment 1 or 2, except for the points described below. Fig. 4 is a schematic view of the display region layer 40 according to embodiment 3, as viewed from above the laminate 110 in fig. 5. In embodiment 2, the

display elements

401, 402, and 403 arranged in the vertical direction of the display region layer 40 and the

display elements

4014, 4024, and 4034 in which the fingerprint authentication sensor is integrated are arranged with a slight interval. In this embodiment mode, the

display elements

401, 402, and 403 and the

display elements

4014, 4024, and 4034 can be arranged so as to be in physical contact with each other as shown in fig. 4. Specifically, for example, 2 display elements may be arranged in physical contact so that the

display elements

401, 402, and 403 are on the upper side and the

display elements

4014, 4024, and 4034 are on the lower side. In embodiment 3, the resolution of the video display area is improved compared to that of embodiment 2. The above description is of the display device 1 and the laminate 110 according to embodiment 3.

Next, a display device 1 and a laminate 110 according to embodiment 4 of the present invention will be described. The display device and the laminate according to embodiment 4 are similar to the display device 1 and the laminate 110 according to embodiment 1, 2, or 3, except for the points described below. Fig. 6 is a schematic view of the display region layer 40 according to embodiment 4, as viewed from above the laminate 110 in fig. 5. In embodiments 2 and 3, the display region layer 40 is provided by mixing the

display elements

401, 402, and 403 (not integrated with the fingerprint authentication sensor) and the

display elements

4014, 4024, and 4034 integrated with the fingerprint authentication sensor. In the present embodiment, only the

display elements

4014, 4024, 4034 integrated with the fingerprint authentication sensor may be disposed in the display area layer 40. Specifically, for example, a plurality of

display elements

4014, 4024, 4034 are vertically arranged with a slight interval, and their columns are arranged laterally with a slight interval in the order of display element 4014, display element 4024, and display element 4034. In embodiment 4, since the density of the fingerprint authentication sensor is increased, the image of the fingerprint can be more appropriately detected. In the case of performing display for fingerprint detection, when only one of

display elements

4014, 4024, 4034 (for example,

display elements

4014, 4024, 4034 of a specific color) is caused to emit light, an image of a fingerprint may be detected by

display elements

4014, 4024, 4034 that do not emit light (the same applies to the other embodiments). The above description is of the display device 1 and the laminate 110 according to embodiment 4.

The display device of the present invention is applicable to a self-luminous display device such as an inorganic EL display device and an organic EL display device, and is preferably applicable to an organic EL display device.

Various embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following embodiments, an example of an organic EL display device will be mainly described as one of display devices.

Fig. 1 is a cross-sectional view of a display device according to embodiment 1 of the present invention.

Referring to fig. 1, the display device of the present invention has a transparent plate 10, a polarizing film 30, a display region layer 40, and a back plate 50. The transparent plate 10 and the polarizing film 30 may be adhered by an adhesive layer 20. The display area layer 40 has a display element and a fingerprint authentication sensor.

Fig. 2 is a schematic view of the display region layer 40 according to embodiment 1, as viewed from above the display device of fig. 1. The display region layer 40 includes a display element including a plurality of display pixels (401, 402, and 403), and a fingerprint authentication sensor 404. At the display area level, the fingerprint authentication sensor 404 and the display element exist on the same side. By their presence on the same plane, a slim display device can be obtained. In the case where the transparent plate 10 and the polarizing film 30 are not provided, that is, even in the case of a display device having the display region layer 40 and the back plate 50, the display device can function as a display device including a fingerprint authentication sensor, and a display device with a finer size can be obtained. The display device preferably has the transparent plate 10 from the viewpoints of stability over time and life. In addition, the display device has a polarizing film 30 from the viewpoint of preventing reflection of external light.

Where the transparent plate 10 contacts the fingerprint of a finger. The fingerprint authentication sensor is present in the display area, so that the fingerprint is sensed in the screen displaying the image, and the fingerprint pattern can be recognized.

The display element emits light by light emission of the display pixels (401, 402, 403). The emitted light travels toward the transparent plate 10 and is emitted to the outside of the display device, and the visual identifier can recognize the emitted light. The display pixels emit light of, for example, blue, red or green. The 1 st display pixel 401, the 2 nd display pixel 402, and the 3 rd display pixel emit, for example, blue, green, and red light, respectively. In fig. 2, the fingerprint authentication sensor and the display element are alternately arranged. By alternately arranging them, the uniformity of fingerprint sensing of the entire screen is increased. The display element or the display pixel has a stacked structure including, for example, a cathode, an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer, and an anode, and is usually driven by an integrated circuit (not shown).

The transparent plate 10 may be a transparent film or a transparent glass. When a transparent film is used as the transparent plate, a flexible display can be obtained. The obtained flexible display is excellent in flexibility because it is slimmed.

The back plate 50 may be a PI (Polyimide) film substrate. In the back plate 50, a multi-layer buffer film may be formed using an insulating material. In addition, wiring for supplying power and signals to the display region layer 40 may be formed on the rear plate 50. The back sheet 50 may further have a PET (polyethylene terephthalate) substrate. The back sheet 50 can block moisture from penetrating so that the display area layer 40 is not exposed to moisture, and in addition, can support the display area layer 40. The flexible display can be used as the display device of the present invention because the back plate 50 has flexibility. In the display device of the present invention, a touch sensor array (not shown) may be provided between the transparent plate 10 and the display region layer 40.

The polarizing film 30 blocks reflection of external light on the display area layer 40, thereby improving outdoor visual recognizability. The polarizing film 40 may comprise a circular polarizer (or λ/4 plate). The adhesive layer 20 for bonding the polarizing film 30 and the transparent plate 10 may be, for example, an Optical Clear Adhesive (OCA).

The display element has display pixels arranged in a matrix, and is electrically connected to data lines and gate lines intersecting the data lines, whereby each display pixel emits light, and the display element provides an input image. The data line is connected to the integrated circuit and receives a data signal from the integrated circuit. The touch sensor array is driven by the touch sensor driving unit, senses a touch input, and transmits coordinates of the touch input and an identification code (ID) to a host system (not shown).

A fingerprint authentication sensor 404 is mounted within the display area layer 40. As the fingerprint authentication sensor 404, an optical fingerprint authentication sensor or an ultrasonic fingerprint authentication sensor may be used.

The optical fingerprint authentication sensor 404 detects a fingerprint pattern using a difference in the amount of light reflected from a Ridge and a Valley (Valley) of a fingerprint that receives light reflected by the fingerprint. The optical fingerprint authentication sensor may include an image sensor such as a CCD (Charge Coupled Device) or a CIS (CMOS image sensor). The display device has an image display mode and a fingerprint authentication mode. The fingerprint authentication sensor 404 may also function as a fingerprint authentication sensor only when a fingerprint is sensed. The fingerprint authentication sensor 404 may also function as a fingerprint authentication sensor in time division. In this case, the time for which the fingerprint authentication sensor functions is preferably 0.02 seconds or less per 1 time of sensing a fingerprint. By setting the time within this range, fingerprint authentication can be performed at a level that cannot be visually recognized by a visual recognizer. More preferably 0.01 second or less, and most preferably 0.005 second or less. In the fingerprint authentication mode functioning as a fingerprint authentication sensor, the display pixels emit light toward the transparent plate 10 by sensing a fingerprint in the transparent plate, and the fingerprint authentication sensor 404 detects reflected light generated by the reflection of the light in the transparent plate. The light emitted by sensing the fingerprint may be monochromatic light. The light emission of each color can be realized by any of blue, red, and green, or a combination of these light emission amounts. The light receiving surface of the optical fingerprint authentication sensor 404 faces the transparent plate 10, and detects the reflected light.

The fingerprint authentication sensor 404 may function as a display element. The fingerprint authentication sensor 404 may function as a fingerprint authentication sensor only when a fingerprint is sensed, and may function as a display element when a fingerprint is not sensed. By functioning as a display element when no fingerprint is sensed, the surface luminance as a display device is improved.

The ultrasonic fingerprint authentication sensor 404 transmits ultrasonic waves to the transparent board 10 using an ultrasonic transmitter in a fingerprint authentication mode, and analyzes the ultrasonic waves reflected at the Ridge (Ridge) and the Valley (Valley) of the fingerprint to detect the fingerprint pattern. The ultrasonic wave receiving surface of the ultrasonic fingerprint authentication sensor 404 faces the fingerprint contacting the transparent plate 10.

In the present invention, since the fingerprint authentication sensor 404 is disposed on the display area layer 40, the distance between the fingerprint contacting the transparent plate 10 and the fingerprint authentication sensor 404 is short. Thereby improving the ultrasonic or light receiving efficiency of the fingerprint authentication sensor 404 and improving the fingerprint sensing performance.

The integrated circuit drives the display pixels by converting data of an input image into data signals and outputting the data signals to the data lines of the display element. The integrated circuit may be included in the touch sensor driving part. The integrated circuit is electrically connected to the fingerprint authentication sensor 404.

The fingerprint authentication sensor 404 is electrically connected to the host system's host port and/or integrated circuit by wiring. The host system is electrically connected to the fingerprint authentication sensor 404 and exchanges data with the fingerprint authentication sensor 404, controlling the fingerprint authentication sensor 404. In the fingerprint authentication mode, the host system transmits fingerprint data of an input image to the integrated circuit. The host system executes an application connected to the coordinates from the touch sensor driving section, and performs user authentication based on the fingerprint information received from the fingerprint authentication sensor 404. The display device can have the following order: when a fingerprint is sensed, correction data, which is background data, can be acquired in advance, and then the sensed data (fingerprint information) obtained when the fingerprint is sensed can be corrected by the correction data. This makes it possible to correct the deviation of the sensing data when an opaque or translucent foreign matter adheres to the surface of the transparent plate 10.

Fig. 1 also shows a 2 nd embodiment of the display device of the present invention. Fig. 3 is a schematic view of the display region layer 40 according to embodiment 2, as viewed from above the display device of fig. 1. As a difference between embodiment 1 and embodiment 2, in embodiment 1, the display pixels (401, 402, 403) of the display area layer 40 and the fingerprint authentication sensor 404 are independently arranged, whereas in embodiment 2, the fingerprint authentication sensor is integrated with a part of the display pixels to form display pixels (4014, 4024, 4034) in which the fingerprint authentication sensor is integrated. The other structure in embodiment 2 is the same as embodiment 1. In embodiment 2, the fingerprint authentication sensor is integrated with the display pixels, and therefore the image display area is enlarged as compared with the image display area of embodiment 1. The fingerprint authentication sensor may also be integrated with all of the display pixels.

Embodiment 3 of the display device of the present invention is also shown in fig. 1. Fig. 4 is a schematic view of the display region layer 40 according to embodiment 3, as viewed from above the display device of fig. 1. As a difference between embodiment 2 and embodiment 3, in embodiment 2, display pixels (401, 402, 403) of the display area layer 40 and display pixels (4014, 4024, 4034) integrating the fingerprint authentication sensor are independently arranged, whereas in embodiment 3, display pixels (401, 402, 403) of the display area layer 40 and display pixels (4014, 4024, 4034) integrating the fingerprint authentication sensor are arranged in physical contact with each other. The other structure in embodiment 3 is the same as embodiment 2. In embodiment 3, the video display area is further enlarged than that of embodiment 2.

The laminate of the present invention has a display region layer and a back plate, and the display region layer has a fingerprint authentication sensor and a display element for displaying an image. The laminate of the present invention can be used extremely suitably in the above-described display device.

In the laminate of the present invention, the display element may be constituted by a plurality of display pixels, and the fingerprint authentication sensor may be integrated with a part of the display pixels. The laminate of the present invention may have a transparent plate on the opposite side of the back plate in the display region layer. The laminate of the present invention may have a polarizing film between the display region layer and the transparent plate, and may have an adhesive layer between the transparent plate and the polarizing film.

The display device of the present invention has a fingerprint authentication sensor and a display element for displaying an image, the fingerprint authentication sensor and the display element being present on the same face.

The display device of the invention is sequentially provided with a transparent plate, a polarization film, a display area layer and a back plate, wherein the display area layer is provided with a fingerprint authentication sensor and a display element for displaying images.

The laminate of the present invention has a display region layer and a back plate, and the display region layer has a fingerprint authentication sensor and a display element for displaying an image.

The display device of the present invention is capable of providing a slim display device by arranging a fingerprint authentication sensor and a display element for displaying an image on the same surface, thereby suppressing an increase in the size of a frame region. In addition, the display device of the present invention is convenient because it can sense a fingerprint in a screen displaying an image. In addition, the laminate of the present invention can provide a slim display device while suppressing an increase in the size of the frame region.

A display device has a fingerprint authentication sensor and a display element for displaying an image, the fingerprint authentication sensor and the display element being present on the same face.

In the above display device, the fingerprint authentication sensor and the display element are alternately arranged.

In the above display device, the display element is constituted by a plurality of display pixels, and the fingerprint authentication sensor is integrated with a part of the display pixels.

In the above display device, the fingerprint authentication sensor functions as a fingerprint authentication sensor only when a fingerprint is sensed.

In the above display device, the fingerprint authentication sensor functions as a fingerprint authentication sensor in a time division manner.

In the above display device, the time during which the fingerprint authentication sensor functions as a fingerprint authentication sensor is 0.02 seconds or less per sensing of a fingerprint.

In the above display device, the fingerprint authentication sensor may function as a display element.

In the above display device, the fingerprint authentication sensor functions as a fingerprint authentication sensor only when a fingerprint is sensed, and functions as a display element when a fingerprint is not sensed.

In the above display device, the display element further includes a transparent plate, and light is emitted to the transparent plate.

In the above display device, the display pixels emit light by sensing a fingerprint, and the fingerprint authentication sensor detects reflected light generated by reflection of the light by the transparent plate.

A display device is provided with a display area layer and a back plate, wherein the display area layer is provided with a fingerprint authentication sensor and a display element for displaying images.

In the above display device, the transparent plate is provided on the opposite side of the rear plate in the display region layer.

In the above display device, a polarizing film is provided between the display region layer and the transparent plate.

In the above display device, an adhesive layer is provided between the transparent plate and the polarizing film.

In the above-described display device, when a fingerprint is sensed, correction data is acquired in advance, and then correction is performed using the sensed data obtained when the fingerprint is sensed and the correction data.

The display device described above is an organic EL display device.

A laminate has a display area layer having a fingerprint authentication sensor and a display element for displaying an image, and a back plate.

In the laminate, a transparent plate is provided on the opposite side of the back plate.

In the laminate, a polarizing film is provided between the display region layer and the transparent plate.

In the laminate, an adhesive layer is provided between the transparent plate and the polarizing film.

Industrial applicability

The present invention can be used in a display device including a fingerprint authentication sensor capable of detecting a fingerprint on a screen.

Description of reference numerals

1 display device

10 transparent plate

20 adhesive layer

30 polarizing film

40 display area layer

50 backboard

100 display device

110 laminated body

401 st display element

402 nd display element

403 3 rd display element

404 fingerprint authentication sensor

4014 fingerprint authentication sensor integrated No. 1 display element

4024 fingerprint authentication sensor integrated No. 2 display element

4034 fingerprint authentication sensor integrated 3 rd display element

Claims

1. A display device is characterized by comprising:

a display element provided on a predetermined surface and configured to display an image;

a fingerprint authentication sensor that is provided on the same surface as the display element and detects an image of a fingerprint used for fingerprint authentication at a position where the display element is displayed; and

a processing unit that performs a fingerprint authentication process using the image detected by the fingerprint authentication sensor.

2. A display device is characterized by comprising:

a display area layer having a display element for displaying a video image and a fingerprint authentication sensor for detecting an image of a fingerprint used for fingerprint authentication at a position where the display element is displayed; and

3. The display device according to claim 1 or 2,

the fingerprint authentication sensor is integral with the display element.

4. The display device according to claim 1 or 2,

the fingerprint authentication sensor and the display element are alternately arranged.

5. The display device according to any one of claims 1 to 4,

the display device further includes: a contact sensor that detects contact or proximity of an object to a position in the display device where the fingerprint is detected,

the fingerprint authentication sensor detects the image of the fingerprint using, as a trigger, detection of contact or proximity of the object by the contact sensor.

6. The display device according to any one of claims 1 to 5,

the fingerprint authentication sensor detects an image of the fingerprint every fixed time.

7. The display device according to claim 5 or 6,

the display element displays a fingerprint detection display at a timing when the fingerprint authentication sensor detects the image of the fingerprint.

8. A laminate for a display device, comprising:

a display element provided on a predetermined surface and configured to display an image; and

a fingerprint authentication sensor that is provided on the same surface as the display element and detects an image of a fingerprint used for fingerprint authentication at a position where display of the display element is performed.

9. A laminate for a display device, characterized in that,

the display device is provided with a display area layer, wherein the display area layer comprises:

a display element for displaying an image; and

and a fingerprint authentication sensor for detecting an image of a fingerprint used for fingerprint authentication at a position where the display of the display element is performed.