Optical body and display device including same

Patent metadata

Field	Value
Publication number	US-12111532-B2
Application number	US-201917294999-A
Country	US
Kind code	B2
Filing date	Nov 12, 2019
Priority date	Nov 22, 2018
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

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.

First claim

The invention claimed is:

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 μm 2 or less is 80% or more of the total dispersions;
wherein the optical body satisfies Conditions (1) and (2) below:
(1) glass transition temperature (T g ) of dispersion>glass transition temperature (T g ) 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 (T g ) of the substrate is 110° C. to 130° C.

2. 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 μm 2 to 0.09 μm 2 or less is 70% to 90% of the total dispersions.

3. 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.

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 μm 2 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 (T g ) of dispersion>Glass transition temperature (T g ) 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 (T g ) of the substrate is 110° C. to 130° C.

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

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

7. The optical body of claim 1 , wherein the optical body transmits a first polarized light parallel to a transmission axis and ref

Assignees

• Toray Advanced Mat Korea Inc

Inventors

• Ko Seung Jin
• Yoo Bae Keun
• Sung Jong Dae

Classifications

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0041

  provided in the bulk of the light guide · CPC title

• G02F1/13362

  providing polarized light, e.g. by converting a polarisation component into another one · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title