# US 10,872,224 B2 · Smart card

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- Number: US 10,872,224 B2
- Document ID: US10872224B2
- Status: Granted
- Kind: B2
- Application number: 16/669,739
- Filed: 2019-10-31
- Published: 2020-05-21
- Granted: 2020-12-22
- Earliest claimed: 2018-11-15
- Assignees: Silicon Display Technology
- Applicants: Silicon Display Technology
- Inventors: Jong Woo Jin; Taehan Go; Youn Duck Nam
- Web page: https://patentgrep.com/patent/US10872224B2

## CPC

- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G06K 19/02: characterised by the selection of materials, e.g. to avoid wear during transport through the machine
- G06K 19/0718: {the sensor being of the biometric kind, e.g. fingerprint sensors (fingerprint sensors in general G06V40/13; biometric access-control systems in general, see G07C9/00)}
- G06V 40/1341: {Sensing with light passing through the finger}
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS

## Abstract

A smart card according to an exemplary embodiment of the present invention includes: a transparent substrate including a side contacting a finger of a user; a reflection layer separated from the transparent substrate, facing the transparent substrate, and including a metal material; a photosensor provided between the transparent substrate and the reflection layer, and sensing light reflected and input from the reflection layer; and a card substrate including an opaque material and covering the reflection layer.

## Claims

### Claim 1

A smart card comprising:
a transparent substrate including a side contacting a finger of a user;
a reflection layer separated from the transparent substrate, facing the transparent substrate, and including a metal material;
a photo-sensor provided between the transparent substrate and the reflection layer, and sensing light reflected and input from the reflection layer; and
a card substrate including an opaque material and covering the reflection layer.

### Claim 2 (depends on 1)

The smart card of claim 1, wherein
light passing through the finger and input to the transparent substrate from among ambient light is reflected from the reflection layer and is input to the photosensor.

### Claim 3 (depends on 2)

The smart card of claim 2, wherein
light passing through a ridge of the fingerprint and input to the transparent substrate is reflected from the reflection layer and is input to the photosensor.

### Claim 4 (depends on 1)

The smart card of claim 1, further comprising
a light source embedded in the card substrate, provided on a side of the transparent substrate, and irradiating light to the transparent substrate,
wherein light totally reflected from one side of the transparent substrate from among light irradiated from the light source is reflected from the reflection layer and is input to the photosensor.

### Claim 5 (depends on 4)

The smart card of claim 4, wherein
total reflection is generated on a portion corresponding to a valley of the fingerprint on one side of the transparent substrate.

### Claim 6 (depends on 1)

The smart card of claim 1, further comprising
a light guide unit filled in the card substrate, provided on a side of the transparent substrate, and guiding light irradiated by an external light source to the transparent substrate,
wherein light guided to the transparent substrate and totally reflected on one side of the transparent substrate from among light irradiated from the external light source is reflected from the reflection layer and is input to the photosensor.

### Claim 7 (depends on 6)

The smart card of claim 6, further comprising
a guide reflection layer including an opaque material and provided on the light guide unit.

### Claim 8 (depends on 6)

The smart card of claim 6, wherein
total reflection is generated on a portion corresponding to a valley of the fingerprint on one side of the transparent substrate.

### Claim 9 (depends on 1)

The smart card of claim 1, wherein
the transparent substrate includes glass, and a thickness is equal to or less than 100 μm.

### Claim 10 (depends on 1)

The smart card of claim 1, wherein
the transparent substrate is a transparent plastic substrate.

### Claim 11 (depends on 9)

The smart card of claim 9, wherein
the transparent substrate is flexible.

### Claim 12 (depends on 10)

The smart card of claim 10, wherein
the transparent substrate is flexible.

### Claim 13 (depends on 1)

The smart card of claim 1, further comprising
a planarization layer provided between the photosensor and the reflection layer.

### Claim 14 (depends on 1)

The smart card of claim 1, wherein
the photosensor includes a first electrode provided on the transparent substrate, a semiconductor layer provided on the first electrode, and a second electrode including a transparent material and provided on the semiconductor layer, and the first electrode and the second electrode form a capacitor.

### Claim 15 (depends on 1)

The smart card of claim 1, wherein
a fingerprint recognition area is provided on part of the smart card, and the reflection layer and the photosensor are provided in the fingerprint recognition area.