# US 10,481,311 B2 · Transparent film, transparent screen, image display system, and transparent poster

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- Number: US 10,481,311 B2
- Document ID: US10481311B2
- Status: Granted
- Kind: B2
- Application number: 16/197,799
- Filed: 2018-11-21
- Published: 2019-03-28
- Granted: 2019-11-19
- Earliest claimed: 2016-05-24
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Yujiro Yanai; Michio Nagai; Akira Yamamoto
- Web page: https://patentgrep.com/patent/US10481311B2

## CPC

- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02B 5/0236: {the diffusion taking place within the volume of the element}
- G02B 5/0278: {used in transmission}
- G02B 5/0294: {adapted to provide an additional optical effect, e.g. anti-reflection or filter}
- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G03B 21/00: Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00)
- G03B 21/14: Details
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G03B 21/60: characterised by the nature of the surface
- G09F 15/02: Bills, posters, or the like therefor
- G03B 21/604: Polarised screens
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS

## Abstract

Provided are a transparent film that allows scenery to be observed without color unevenness in a state where light is not irradiated, a transparent screen and an image display system including the transparent film, and a transparent poster. The transparent film includes: a support; a dot array that is formed on one surface of the support and in which dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged; and an overcoat layer that covers the dots and is laminated on the support, in which areas of the dots and distances between the dots are made to be irregular. As a result, the object is achieved.

## Claims

### Claim 1

A transparent film comprising:
a support;
a dot array that is formed on one main surface of the support and in which dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged; and
an overcoat layer that covers the dot array and is laminated on the support,
wherein in a case where, in a cumulative distribution diagram in which a horizontal axis represents an area of the dots, an area of the dots corresponding to a cumulative distribution of 50% is represented by Xs, an area of the dots corresponding to a cumulative distribution of 5% is represented by Ysa, and an area of the dots corresponding to a cumulative distribution of 95% is represented by Ysb, and
in a case where, in a cumulative distribution diagram in which a horizontal axis represents an inter-dot distance as a distance between one dot and another dot that is most adjacent to the dot, an inter-dot distance corresponding to a cumulative distribution of 50% is represented by Xd, an inter-dot distance corresponding to a cumulative distribution of 5% is represented by Yda, and an inter-dot distance corresponding to a cumulative distribution of 95% is represented by Ydb, the dot array satisfies at least one of the following Expression (1), (2), (3), or (4),
Xs×0.85>Ysa Expression (1),
Xs×1.15<Ysb Expression (2),
Xd×0.85>Yda Expression (3), and
Xd×1.15<Ydb Expression (4).

### Claim 2 (depends on 1)

The transparent film according to claim 1,
wherein a difference between an average refractive index of the dots and a refractive index of the overcoat layer is 0.1 or lower.

### Claim 3 (depends on 1)

The transparent film according to claim 1,
wherein each of the dots has a stripe pattern including bright portions and dark portions in a cross-section, and
an angle between a normal line perpendicular to a line, which is formed using a first dark portion from a surface of the dot, and the surface of the dot is 70° to 90°.

### Claim 4 (depends on 1)

The transparent film according to claim 1,
wherein an average of the inter-dot distances of the dots is 10 to 100 μm, and
an average dot diameter of the dots is 10 to 100 μm.

### Claim 5 (depends on 1)

The transparent film according to claim 1,
wherein the dots satisfy at least one of Expression (3) or (4).

### Claim 6 (depends on 1)

A transparent screen that is formed of the transparent film according to claim 1.

### Claim 7 (depends on 1)

An image display system comprising:
a transparent screen that is formed of the transparent film according to claim 1; and
a projector.

### Claim 8 (depends on 1)

A transparent poster that is formed of the transparent film according to claim 1,
wherein the dots in the dot array are formed in an image shape.