# US 7,745,793 B2 · Infrared signal receiver, liquid crystal display and optical element

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- Number: US 7,745,793 B2
- Document ID: US7745793B2
- Status: Granted
- Kind: B2
- Application number: 11/769,446
- Filed: 2007-06-27
- Published: 2008-07-10
- Granted: 2010-06-29
- Earliest claimed: 2006-06-28
- Assignees: Sony Corporation
- Inventors: Masaharu Senoue; Kazuhiko Morisawa; Takashi Watanabe; Shunichi Kajiya; Kenichi Sasaki; Hitomi Madokoro; Yuji Takahashi; Rie Tsubo
- Web page: https://patentgrep.com/patent/US7745793B2

## CPC

- H04B 10/1141: {One-way transmission}
- H04B: TRANSMISSION

## Abstract

There is provided an infrared signal receiver which includes a photo-detector unit receiving light in a predetermined infrared wavelength region, sent from a remote operating unit; and an optical element disposed in front of the photo-detector unit, allowing the light of the predetermined infrared wavelength region to transmit therethrough in preference to other infrared wavelength region. In the receiver, the predetermined signal wavelength region is a region of 930 nm or longer and 960 nm or shorter, and mean transmittance of light of the optical element in the predetermined signal wavelength region is larger than mean transmittance of light in a region of 900 nm or longer and shorter than 930 nm, and/or, mean transmittance of light in a region of longer than 960 nm and 1,020 nm or shorter.

## Claims

### Claim 1

An infrared signal receiver comprising:
a photo-detector unit receiving light of a predetermined infrared wavelength region, sent from a remote operating unit; and
an optical element disposed in front of the photo-detector unit, allowing the light of the predetermined infrared wavelength region to transmit therethrough in preference to other infrared wavelength region,
wherein:
the predetermined signal wavelength region is a region of 930 nm or longer and 960 nm or shorter,
mean transmittance of light of the optical element in the predetermined signal wavelength region at an angle of incidence of 0° is larger than mean transmittance of light in a region of 900 nm or longer and 930 nm or shorter, and/or, mean transmittance of light in a region of 960 nm or longer and 1,020 nm or shorter, and
the predetermined infrared wavelength region sent from the remote operating unit and a peak position of the transmittance of the optical element match each other.

### Claim 2 (depends on 1)

The infrared signal receiver as claimed in claim 1, wherein the optical element is a multi-layered film composed of a plurality of substances having different refractive indices.

### Claim 3 (depends on 1)

The infrared signal receiver as claimed in claim 1, wherein the optical element is a dye-containing layer, or a composite layer of the dye-containing layer and a multi-layered film composed of a plurality of substances having different refractive indices.

### Claim 4 (depends on 1)

The infrared signal receiver as claimed in claim 1, further comprising a beam guide component, disposed between the remote operating unit and the photo-detector unit, causing modification in direction of propagation of infrared beam,
wherein:
the optical element is disposed on a beam exit surface of the beam guide component, which opposes to the photo-detector unit.

### Claim 5 (depends on 1)

The infrared signal receiver as claimed in claim 1, wherein the optical element includes a multi-layered film having a plurality of high-refractive-index material layers and a plurality of low-refractive-index material layers alternately stacked on a transparent substrate.

### Claim 6

A liquid crystal display comprising:
a photo-detector unit receiving light of a predetermined infrared wavelength region, sent from a remote operating unit; and
an optical element disposed in front of the photo-detector unit, allowing the light of the predetermined signal wavelength region to transmit therethrough in preference to other infrared wavelength region,
wherein:
the predetermined signal wavelength region is a region of 930 nm or longer and 960 nm or shorter,
mean transmittance of light of the optical element in the predetermined signal wavelength region at an angle of incidence of 0° is larger than mean transmittance of light in a region of 900nm or longer and 930 nm or shorter, and/or, mean transmittance of light in a region of 960 nm or longer and 1,020 nm or shorter, and
wherein the predetermined infrared wavelength region sent from the remote operating unit and a peak position of the transmittance of the optical element match each other.

### Claim 7 (depends on 6)

The liquid crystal display as claimed in claim 6, wherein:
the photo-detector unit is disposed as being directed to a direction different from a vertical line on a display surface, and
a beam guide component is disposed between the remote operating unit and the photo-detector unit, causing modification in direction of propagation of infrared beam,
wherein the optical element is disposed on a beam exit surface of the beam guide component, which opposes to the photo-detector unit.

### Claim 8 (depends on 6)

The liquid crystal display as claimed in claim 6, wherein the optical element includes a multi-layered film having a plurality of high-refractive-index material layers and a plurality of low-refractive-index material layers alternately stacked on a transparent substrate.

### Claim 9

An optical element disposed in front of a photo-detector unit which receives light in a predetermined infrared wavelength region sent from a remote operating unit, allowing the light of the predetermined signal wavelength region to transmit therethrough in preference to other infrared wavelength region, wherein:
the optical element has mean transmittance of light at an angle of incidence of 0° in the region of 930 nm or longer and 960 nm or shorter, is larger than mean transmittance of light in a region of 900 nm or longer and 930 nm or shorter, and/or, mean transmittance of light in a region of 960 nm or longer and 1,020 nm or shorter,
wherein the predetermined infrared wavelength region sent from the remote operating unit and a peak position of the transmittance of the optical element match each other.

### Claim 10 (depends on 9)

The optical element as claimed in claim 9, further comprising a pressure-sensitive adhesive layer provided on one surface of the optical element.

### Claim 11 (depends on 9)

The optical element as claimed in claim 9, wherein the optical element includes a multi-layered film having a plurality of high-refractive-index material layers and a plurality of low-refractive-index material layers alternately stacked on a transparent substrate.

### Claim 12

An infrared signal receiver system comprising:
a remote operating unit;
a photo-detector unit receiving light of a predetermined infrared wavelength region, sent from the remote operating unit; and
an optical element disposed in front of the photo-detector unit, allowing the light of the predetermined infrared wavelength region to transmit therethrough in preference to other infrared wavelength region,
wherein:
the predetermined signal wavelength region is a region of 930 nm or longer and 960 nm or shorter,
mean transmittance of light of the optical element in the predetermined signal wavelength region at an angle of incidence of 0° is larger than mean transmittance of light in a region of 900 nm or longer and 930 nm or shorter, and/or, mean transmittance of light in a region of 960 nm or longer and 1,020 nm or shorter, and
the predetermined infrared wavelength region sent from the remote operating unit and a peak position of the transmittance of the optical element match each other.