# US 11,112,910 B2 · Sensor including first optical member with reflection property and second optical member with absorption property capable of absorbing light reflected by first optical member and electronic device including the same

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- Number: US 11,112,910 B2
- Document ID: US11112910B2
- Status: Granted
- Kind: B2
- Application number: 16/448,361
- Filed: 2019-06-21
- Published: 2019-12-26
- Granted: 2021-09-07
- Earliest claimed: 2018-06-22
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jeonggyu Jo; Hyeongsoon Park; Bokyung Sim
- Web page: https://patentgrep.com/patent/US11112910B2

## CPC

- B60R 25/252: {Fingerprint recognition}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G02F 1/133509: {Filters, e.g. light shielding masks}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen}
- G06F 3/0428: {by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual (sensing beam interruptions in a planar beam grid of an optical touch-screen G06F3/0421)}
- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G06V 40/1329: {Protecting the fingerprint sensor against damage caused by the finger}
- G06F 2203/04109: FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
- G06V 40/1341: {Sensing with light passing through the finger}
- G06V 40/15: {Biometric patterns based on physiological signals, e.g. heartbeat, blood flow}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

## Abstract

According to an embodiment, an electronic device, comprises a transparent member, an optical sensor disposed under the transparent member and including a light transmitter configured to emit light of a designated wavelength band and a light receiver configured to obtain light of the designated wavelength band emitted from the light transmitter and reflected by an external object adjacent to the transparent member, a first optical filter disposed between the transparent member and the optical sensor, having a first transmittance for light of the designated wavelength band, and configured to reflect light outside the designated wavelength band, and a second optical filter disposed between the transparent member and the first optical filter, having a second transmittance less than the first transmittance for light of the designated wavelength band, and configured to absorb at least a portion of the light reflected by the first optical filter.

## Claims

### Claim 1

A sensor, comprising:
a light receiver;
a first optical member disposed on the light receiver to transmit light having a designated wavelength band to the light receiver, and configured to at least partially reflect light having wavelengths lower than the designated wavelength band and light having wavelengths higher than the designated wavelength band; and
a second optical member disposed on the first optical member to transmit, at least, light of the designated wavelength band and configured to at least partially absorb the light reflected by the first optical member;
wherein the designated wavelength band is 930 nm to 955 nm; and
wherein a combination of the first optical member and the second optical member has a transmittance of 80% or more for light of the designated wavelength band of light.

### Claim 2 (depends on 1)

The sensor of claim 1, further comprising a base film including one surface where the first optical member is formed and another surface where the second optical member is formed, wherein the base film is disposed on the light receiver, with the first optical member facing the light receiver.

### Claim 3 (depends on 1)

The sensor of claim 1, further comprising at least one light emitting element disposed adjacent the light receiver, wherein the light receiver is configured to receive light emitted from the light emitting element and reflected by an external object.

### Claim 4 (depends on 1)

The sensor of claim 1, further comprising a transparent member disposed on the second optical member.

### Claim 5 (depends on 4)

The sensor of claim 4, wherein the second optical member is disposed in contact with an inner surface of the transparent member.