# US 2022/0036104 A1 · Biometric device and biometric system including the same

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- Number: US 2022/0036104 A1
- Document ID: US20220036104A1
- Status: Published application
- Kind: A1
- Application number: 17/331,300
- Filed: 2021-05-26
- Published: 2022-02-03
- Earliest claimed: 2020-07-28
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: YOUNG SAM PARK; Seung Youl KANG; Chul Woong JOO; Jae-Eun PI
- Web page: https://patentgrep.com/patent/US20220036104A1

## CPC

- A61B 5/1172: using fingerprinting
- G06V 40/67: {by interactive indications to the user}
- G02B 27/106: {for splitting or combining a plurality of identical beams or images, e.g. image replication}
- G02F 1/1339: Gaskets; Spacers; Sealing of cells
- G02F 1/134309: {characterised by their geometrical arrangement}
- G06V 40/1312: {direct reading, e.g. contactless acquisition}
- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G02F 1/13306: {Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence)}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

Disclosed are a biometric device and a biometric system including the same. The device includes a hiogenic-synthesized film, a reflective layer disposed on one side of the biogenic-synthesized film, a light source disposed on the reflective layer to generate light, a beam splitter disposed between the light source and the reflective layer to provide the light to the reflective layer and another side of the biogenic-synthesized film, and a light switching layer disposed between the beam splitter and the reflective layer to switch the light provided to the reflective layer.

## Claims

### Claim 1

A biometric device comprising:
a biogenic-synthesized film;
a first reflective layer disposed on one side of the biogenic-synthesized film;
a light source disposed on the first reflective layer to generate light;
a first beam splitter disposed between the light source and the first reflective layer to provide the light to the first reflective layer and another side of the biogenic-synthesized film; and
a first light switching layer disposed between the first beam splitter and the first reflective layer to switch the light provided to the first reflective layer.

### Claim 2 (depends on 1)

The biometric device of claim 1, wherein the first light switching layer comprises a liquid crystal panel.

### Claim 3 (depends on 1)

The biometric device of claim 1, wherein the first light switching layer comprises:
a lower substrate;
a first lower electrode on the lower substrate;
a liquid crystal layer on the first lower electrode;
a first upper electrode on the liquid crystal layer; and
an upper substrate on the first upper electrode.

### Claim 4 (depends on 3)

The biometric device of claim 3, wherein the first light switching layer further comprises a sealing layer provided on edges of the first lower electrode and the first upper electrode and surrounding the liquid crystal layer.

### Claim 5 (depends on 1)

The biometric device of claim 1, further comprising a light refraction layer disposed between the first beam splitter and the first light switching layer.

### Claim 6 (depends on 5)

The biometric device of claim 5, wherein the light refraction layer comprises:
a second lower electrode;
a refractive index changing layer on the second lower electrode; and
a second upper electrode on the refractive index changing layer.

### Claim 7 (depends on 1)

The biometric device of claim 1, further comprising:
a light absorption layer disposed on the light source to absorb light on the light source; and
a collimator disposed between the light absorption layer and the light source.

### Claim 8

The biometric device of claim I. further comprising:
a second reflective layer provided on the light source and reflecting the light to the light source or the biogenic-synthesized film;
a second beam splitter disposed between the second reflective layer and the light source to provide the light to the second reflective layer or the biogenic-synthesized film; and
a second light switching layer disposed between the second beam splitter and the light source to switch the light provided on the light source.

### Claim 9 (depends on 8)

The biometric device of claim 8, wherein the second light switching layer is operated in an opposite manner to that of the first light switching layer.

### Claim 10 (depends on 8)

The biometric device of claim 8, further comprising:
a first interlayer insulation layer disposed between the first reflective layer and the biogenic-synthesized film;
a second interlayer insulation layer disposed between the second reflective layer and the second beam splitter; and
a third light switching layer disposed on sidewalls of the second beam splitter, the second interlayer insulation layer, and the second reflective layer.

### Claim 11

A biometric system comprising:
a substrate;
a biometric device disposed on one side of the substrate; and
a sensing device disposed on another side of the substrate,
wherein the biometric device comprises:
a biogenic-synthesized film on the substrate;
a first reflective layer disposed on one side of the biogenic-synthesized film;
a first light source disposed on the first reflective layer to generate first light;
a first beam splitter disposed between the first light source and the first reflective layer to provide the first light to the first reflective layer and the other side of the biogenic-synthesized film; and
a light switching layer disposed between the first beam splitter and the first reflective layer to switch the first light provided to the first reflective layer.

### Claim 12 (depends on 11)

The biometric system of claim 11, wherein the substrate comprises a flexible substrate.

### Claim 13 (depends on 12)

The biometric system of claim 12, wherein the flexible substrate comprises polyimide or polyethylene naphthalene.

### Claim 14 (depends on 11)

The biometric system of claim 11, wherein the sensing device comprises:
a second light source configured to generate second light; and
a light detector disposed adjacent to the second light source and receiving the second light.

### Claim 15 (depends on 14)

The biometric. system of claim 14, wherein each of the first light source and the second light source comprises a light emitting device. 15

### Claim 16 (depends on 11)

The biometric system of claim 11, wherein the biometric device and the sensing device are alternately disposed in a first direction and in a second direction intersecting the first direction.

### Claim 17 (depends on 11)

The biometric system of claim 11. further comprising a transparent cover connected to an edge of the substrate and covering the biometric device and the sensing device.

### Claim 18 (depends on 11)

The biometric system of claim 11,
wherein the biometric device is provided in plurality,
wherein the plurality of biometric devices are disposed on two sides of the sensing device.

### Claim at position 19 (depends on 18)

19, The biometric system of claim 18,
wherein the substrate is concavely bent so that the plurality of biometric devices come closer to each other,