# US 12,111,532 B2 · Optical body and display device including same

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- Number: US 12,111,532 B2
- Document ID: US12111532B2
- Status: Granted
- Kind: B2
- Application number: 17/294,999
- Filed: 2019-11-12
- Published: 2022-01-13
- Granted: 2024-10-08
- Earliest claimed: 2018-11-22
- Assignees: Toray Advanced Materials Korea Inc.
- Applicants: Toray Advanced Materials Korea Inc.
- Inventors: Seung Jin Ko; Bae Keun Yoo; Jong Dae Sung
- Web page: https://patentgrep.com/patent/US12111532B2

## CPC

- G02B 5/3008: {comprising dielectric particles, e.g. birefringent crystals embedded in a matrix}
- G02F 1/133524: {Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 6/0041: {provided in the bulk of the light guide}
- G02B 6/0043: {provided on the surface of the light guide}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0056: {for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 27/286: {for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34)}
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- G02F 1/13362: {providing polarized light, e.g. by converting a polarisation component into another one}
- 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

The present invention relates to an optical body and a display device including the same, and more specifically, the present invention relates to an optical body, which can minimize optical loss thereof and maximize luminance enhancement thereof, and a display device including the same.

## Claims

### Claim 1

An optical body, comprising:
a substrate; and
a plurality of dispersions dispersed and comprised inside the substrate,
wherein the plurality of dispersions have an average aspect ratio of 0.5 or less, and the number of dispersions having a cross-sectional area of 0.3 μm2 or less is 80% or more of the total dispersions;
wherein the optical body satisfies Conditions (1) and (2) below:
(1) glass transition temperature (Tg) of dispersion>glass transition temperature (Tg) of substrate,
(2) the difference in the glass transition temperatures of a dispersion and a substrate is within a range of 3 to 9° C.; and
wherein the glass transition temperature (Tg) of the substrate is 110° C. to 130° C.

### Claim 2 (depends on 1)

The optical body of claim 1, wherein in the plurality of dispersions, the number of dispersions having a cross-sectional area of more than 0.01 μm2 to 0.09 μm2 or less is 70% to 90% of the total dispersions.

### Claim 3 (depends on 1)

The optical body of claim 1, wherein the plurality of dispersions have a cross-sectional dispersion coefficient of 90% to 120% according to Mathematical Formula 2 below:
[
Mathematical
⁢
Formula
⁢
2
]
Cross
-
sectional
⁢
dispersion
⁢
⁢
coefficient
⁢
(
%
)
=
Standard
⁢
deviation
⁢
of
⁢
cross
-
sectional
⁢
area
⁢
of
⁢
dispersion
Average
⁢
cross
-
sectional
⁢
area
⁢
of
⁢
dispersion
×
100.

### Claim 4

An optical body, comprising:
a substrate; and
a plurality of dispersions dispersed and comprised inside the substrate,
wherein the plurality of dispersions have an average cross-sectional area of 1 μm2 or less, and an aspect ratio dispersion coefficient of 40% or more according to Mathematical Formula 1 below:
[
Mathematical
⁢
Formula
⁢
1
]
⁢
Aspect
⁢
ratio
⁢
dispersion
⁢
coefficient
⁢
(
%
)
=
Standard
⁢
deviation
⁢
⁢
of
⁢
aspect
⁢
ratio
⁢
of
⁢
dispersion
Average
⁢
aspect
⁢
ratio
⁢
of
⁢
dispertion
×
100
;
wherein the optical body satisfies Conditions (1) and (2) below:
(1) Glass transition temperature (Tg) of dispersion>Glass transition temperature (Tg) of substrate
(2) The difference in the glass transition temperatures of a dispersion and a substrate is within a range of 3 to 9° C.; and
wherein the glass transition temperature (Tg) of the substrate is 110° C. to 130° C.

### Claim 5 (depends on 4)

The optical body of claim 4, wherein the plurality of dispersions have an average aspect ratio of 0.3 to 0.5.

### Claim 6 (depends on 1)

The optical body of claim 1, wherein the optical body has a haze of 25% or less.

### Claim 7 (depends on 1)

The optical body of claim 1, wherein the optical body transmits a first polarized light parallel to a transmission axis and reflects a second polarized light parallel to an extinction axis.

### Claim 8 (depends on 7)

The optical body of claim 7, wherein the optical body has a luminance dispersion coefficient of 2% or less according to Mathematical Formula 3 below, which is measured based on an in-plane virtual first line parallel to the transmission axis:
[
Mathematical
⁢
Formula
⁢
3
]
⁢
Luminance
⁢
dispersion
⁢
coefficient
⁢
(
%
)
=
standard
⁢
deviation
⁢
of
⁢
luminance
⁢
of
⁢
samples
Average
⁢
luminance
⁢
of
⁢
samples
×
100.

### Claim 9 (depends on 8)

The optical body of claim 8, wherein the included angle which is an acute angle with the first line is ±60°, and the luminance dispersion coefficient which is measured based on an in-plane virtual second line passing through a bisecting point of the first line is within 2%.

### Claim 10 (depends on 1)

A display device, comprising the optical body of claim 1.

### Claim 11 (depends on 4)

The optical body of claim 4, wherein the optical body has a haze of 25% or less.

### Claim 12 (depends on 4)

The optical body of claim 4, wherein the optical body transmits a first polarized light parallel to a transmission axis and reflects a second polarized light parallel to an extinction axis.

### Claim 13 (depends on 12)

The optical body of claim 12, wherein the optical body has a luminance dispersion coefficient of 2% or less according to Mathematical Formula 3 below, which is measured based on an in-plane virtual first line parallel to the transmission axis:
[
Mathematical
⁢
Formula
⁢
3
]
⁢
Luminance
⁢
dispersion
⁢
coefficient
⁢
(
%
)
=
standard
⁢
deviation
⁢
of
⁢
luminance
⁢
of
⁢
samples
Average
⁢
luminance
⁢
of
⁢
samples
×
100.

### Claim 14 (depends on 13)

The optical body of claim 13, wherein the included angle which is an acute angle with the first line is ±60°, and the luminance dispersion coefficient which is measured based on an in-plane virtual second line passing through a bisecting point of the first line is within 2%.

### Claim 15 (depends on 4)

A display device, comprising the optical body of claim 4.