# US 2021/0334497 A1 · Fingerprint recognition device, fingerprint recognition method, and display device

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- Number: US 2021/0334497 A1
- Document ID: US20210334497A1
- Status: Published application
- Kind: A1
- Application number: 16/331,364
- Filed: 2018-07-27
- Published: 2021-10-28
- Earliest claimed: 2017-12-15
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Lei Wang; Haisheng Wang; Yingming Liu; Changfeng Li; Rui Xu
- Web page: https://patentgrep.com/patent/US20210334497A1

## CPC

- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally}
- G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen}
- G06V 40/1312: {direct reading, e.g. contactless acquisition}
- G06V 40/1324: {by using geometrical optics, e.g. using prisms (G06V40/1312 takes precedence)}
- G06V 40/1329: {Protecting the fingerprint sensor against damage caused by the finger}
- G06V 40/1341: {Sensing with light passing through the finger}
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

The present disclosure generally relates to the field of display technology, and in particular to a fingerprint recognition device and a display device having the fingerprint recognition device. A fingerprint recognition device includes a substrate; a plurality of point light sources on the substrate, which are configured to emit light; a plurality of light sensors on the substrate, which are configured to generate an electrical signal based on the light emitted from the plurality of point light sources and reflected from a touch surface, and a display layer on the plurality of light sensors.

## Claims

### Claim 1

A fingerprint recognition device, comprising:
a substrate;
a plurality of point light sources on the substrate, which are configured to emit light;
a plurality of light sensors on the substrate, which are configured to generate an electrical signal based on the light emitted from the plurality of point light sources and reflected from a touch surface; and
a display layer on the plurality of light sensors.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the plurality of point light sources and the plurality of light sensors are on opposite sides of the substrate, with the plurality of light sensors being on a display side of the substrate.

### Claim 3 (depends on 1)

The device according to claim 1, wherein the plurality of point light source and the plurality of light sensors are on a display side of the substrate.

### Claim 4 (depends on 1)

The device according to claim 1, further comprising a light shielding layer on a side of the plurality of the light sensor facing the at least one point light source.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the plurality of point light sources are arranged in an array.

### Claim 6 (depends on 1)

The device according to claim 1, wherein a distance between a pair of adjacent point light sources satisfies a relationship defined by formula (I):
p
≤
d
⁢
⁢
tan
⁢
⁢
θ
1
2
,
(
1
)
in which p is the distance between the pair of adjacent point light sources, d is the distance between a first of the pair of point light sources and the imaging surface, and θ1 is the maximum divergence angle of light that is emitted by the first of the pair of point light sources and that is detectable by one of the plurality of light sensors.

### Claim 7 (depends on 1)

The device according to claim 1, further comprising a touch layer on the display layer,
wherein the touch layer is configured to determine a position of contact between the finger of the user and the imaging surface, and when a contact is detected, the touch layer is configured to determine the position of the contact, so that a display is not generated in a portion of the display layer corresponding to the position of the contact.

### Claim 8 (depends on 1)

The device according to claim 1, further comprising a touch layer on the light sensor, and a backlight on the touch laver,
wherein the touch layer is configured to determine a position of contact between the finger of the user and the touch surface, and when a contact is detected, the touch layer is configured to determine the position of the contact, so that the backlight is turned off at the position of the contact.

### Claim 9 (depends on 1)

The device according to claim 1, wherein:
each of the plurality of point light sources comprises a light source and a pinhole layer on the light source, and
the pinhole layer comprises a pinhole array.

### Claim 10 (depends on 9)

The device according to claim 9, wherein each pinhole in the pinhole array is tapered.

### Claim 11 (depends on 9)

The device according to claim 9, wherein:
the pinhole layer comprises a reflective coating layer; and
the reflective coating layer is at least one selected from (i) a metal layer comprising a metal having a high reflectivity and (ii) a dielectric layer comprising a low refractive layer and a high refractive layer arranged in an alternating manner.

### Claim 12 (depends on 1)

The device according to claim 1, wherein:
each of the plurality of point light sources comprises a plurality of light emitting devices arranged in an array, and
each of the plurality of light emitting devices is one selected from the group consisting of OLED, LED, and MicroLED.

### Claim 13 (depends on 5)

The device according to claim 5, Wherein the plurality of point light sources are configured to illuminate according to a predetermined illumination sequence.

### Claim 14

An organic light-emitting diode (OLED) device for fingerprint recognition, comprising:
a point light source layer comprising at least one point light source configured to emit light,
an array substrate, a first electrode,
a light emitting layer,
a second electrode, and
a protective layer,
arranged in the stated order,
wherein the light emitting layer comprises a plurality of light sensors configured to generate an electric signal based on the light emitted from the plurality of point light sources and reflected from a touch surface of the OLED device.

### Claim 15 (depends on 1)

A display device comprising the fingerprint recognition device according to claim 1.

### Claim 16 (depends on 14)

A display device comprising the OLED device according to claim 14.

### Claim 17 (depends on 1)

A fingerprint recognition method using the fingerprint recognition device according to claim 1, the method comprising:
detecting a contact by a user on the touch surface,
causing the plurality of point light sources to emit a light toward the touch surface at a position of the contact,
detecting a light reflected nom the touch surface at the position of the contact, and
generating an image of the fingerprint of the user based on the detected light.

### Claim 18 (depends on 17)

The fingerprint recognition method according to claim 17, further comprising turning off a backlight at the position of the contact.

### Claim 19 (depends on 17)

The fingerprint recognition method according to claim 17, further comprising turning off a display in the portion of the display layer corresponding to the position of the contact.