# US 12,222,595 B2 · Optical film comprising a first sheet having a pyramid pattern layer and backlight unit having the same

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- Number: US 12,222,595 B2
- Document ID: US12222595B2
- Status: Granted
- Kind: B2
- Application number: 18/660,323
- Filed: 2024-05-10
- Published: 2025-01-02
- Granted: 2025-02-11
- Earliest claimed: 2023-06-28
- Assignees: Lms Co., Ltd.
- Applicants: LMS Co., Ltd.
- Inventors: Hyeonuk Park; Byeonghun Lee; Dongkyu Lee
- Web page: https://patentgrep.com/patent/US12222595B2

## CPC

- G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- 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

According to various embodiments of the present disclosure, an optical film comprises a first sheet including a pyramid pattern layer including a plurality of pyramid patterns and a first prism pattern layer including a plurality of first prisms patterns; a second sheet including a second prism pattern layer including a plurality of second prism patterns and a first diffusion layer; and a third sheet including a third prism pattern layer including a plurality of third prism patterns and a second diffusion layer.

## Claims

### Claim 1

An optical film comprising:
a first sheet including a first base portion; a pyramid pattern layer including a plurality of pyramid patterns formed on a first surface of the first base portion wherein each pyramid pattern has a first pitch corresponding to a length of a first side of a pyramid base of the pyramid pattern and a first prime pitch corresponding to a diagonal length of the pyramid base of the pyramid pattern; and a first prism pattern layer including a plurality of first prisms patterns formed on a second surface of the first base portion wherein each first prism pattern has a second pitch corresponding to a prism base length of the first prism pattern;
a second sheet including a second base portion; a second prism pattern layer including a plurality of second prism patterns formed on a first surface of the second base portion; and a first diffusion layer formed on a second surface of the second base portion wherein the first diffusion layer is disposed over the first sheet facing the pyramid pattern layer; and
a third sheet including a third base portion; a third prism pattern layer including a plurality of third prism patterns formed on a first surface of the third base portion; and a second diffusion layer formed on a second surface of the third base portion wherein the second diffusion layer is disposed over the second sheet facing the second prism pattern layer,
wherein ridges of the plurality of the first prism patterns are formed along a first direction; a direction extended from the side of the pyramid base of the pyramid pattens forms an angle with the first direction in a range of 0° or greater and 45° or less; ridges of the plurality of the second prism patterns are formed along a second direction substantially perpendicular to the first direction; and ridges of the plurality of the third prism patterns are formed along a third direction substantially perpendicular to the second direction.

### Claim 2 (depends on 1)

The optical film of claim 1, wherein the second sheet and the third sheet are laminated.

### Claim 3 (depends on 1)

The optical film of claim 1, wherein the first, the second sheet and the third sheet are laminated.

### Claim 4 (depends on 1)

The optical film of claim 1, wherein the first sheet refracts or reflects a light incident to the second surface of second base portion of the second sheet with a predetermined angle.

### Claim 5 (depends on 1)

The optical film of claim 1, wherein an absolute value of a difference of a refractive index of the pyramid pattern layer and a refractive index of the first prism pattern layer is 0.2 or less.

### Claim 6 (depends on 1)

The optical film of claim 1, wherein the optical film satisfies either Formula 1 or Formula 2:
n
·
(
pi
⁢
1
-
1
)
2
<
pi
⁢
2
<
n
·
pi
⁢
1
[
Formula
⁢
1
]
or
n
·
(
pi
⁢
1
-
1
)
2
>
pi
⁢
2
,
[
Formula
⁢
2
]
wherein pi1 is the first pitch; pi1-1 is the first prime; pi2 is the second pitch; and n is a natural number.

### Claim 7

A backlight unit comprising:
an edge type light source; and
an optical film disposed over the light source further comprising:
a first sheet including a first base portion; a pyramid pattern layer including a plurality of pyramid patterns formed on a first surface of the first base portion wherein each pyramid pattern has a first pitch corresponding to a length of a first side of a pyramid base of the pyramid pattern and a first prime pitch corresponding to a diagonal length of the pyramid base of the pyramid pattern; and a first prism pattern layer including a plurality of first prisms patterns formed on a second surface of the first base portion wherein each first prism pattern has a second pitch corresponding to a prism base length of the first prism pattern;
a second sheet including a second base portion; a second prism pattern layer including a plurality of second prism patterns formed on a first surface of the second base portion; and a first diffusion layer formed on a second surface of the second base portion wherein the first diffusion layer is disposed over the first sheet facing the pyramid pattern layer; and
a third sheet including a third base portion; a third prism pattern layer including a plurality of third prism patterns formed on a first surface of the third base portion; and a second diffusion layer formed on a second surface of the third base portion wherein the second diffusion layer is disposed over the second sheet facing the second prism pattern layer,
wherein ridges of the plurality of the first prism patterns are formed along a first direction; a direction extended from the side of the pyramid base of the pyramid pattens forms an angle with the first direction in a range of 0° or greater and 45° or less; ridges of the plurality of the second prism patterns are formed along a second direction substantially perpendicular to the first direction; and ridges of the plurality of the third prism patterns are formed along a third direction substantially perpendicular to the second direction.

### Claim 8 (depends on 7)

The backlight unit of claim 7, wherein the edge type light source is arranged in a fourth direction substantially perpendicular to the first direction and the edge type light source emits a light substantially parallel to the first direction.

### Claim 9 (depends on 7)

The backlight unit of claim 7, wherein the edge type light source is arranged in the fourth direction; the first direction is tilted with a first angle from the fourth direction; and the third direction is substantially parallel to the first direction and tilted with a second angle which is substantially the same as the first angle from the fourth direction.

### Claim 10 (depends on 7)

The backlight unit of claim 7, wherein the optical film satisfies either Formula 3 or Formula 4:
n
·
(
pi
⁢
1
-
1
)
2
<
pi
⁢
2
<
n
·
pi
⁢
1
[
Formula
⁢
3
]
or
n
·
(
pi
⁢
1
-
1
)
2
>
pi
⁢
2
,
[
Formula
⁢
4
]
wherein pi1 is the first pitch; pi1-1 is the first prime; pi2 is the second pitch; and n is a natural number.

### Claim 11

An optical film comprising:
a first sheet including a first base portion; a pyramid pattern layer including a plurality of pyramid patterns formed on a first surface of the first base portion wherein each pyramid pattern has a first pitch corresponding to a length of a first side of a pyramid base of the pyramid pattern and a first prime pitch corresponding to a diagonal length of the pyramid base of the pyramid pattern; and a first prism pattern layer including a plurality of first prisms patterns formed on a second surface of the first base portion wherein each first prism pattern has a second pitch corresponding to a prism base length of the first prism pattern,
wherein ridges of the plurality of the first prism patterns are formed along a first direction and a direction extended from the side of the pyramid base of the pyramid pattens forms an angle with the first direction in a range of 0° or greater and 45° or less; and
wherein the optical film satisfies either Formula 5 or Formula 6:
n
·
(
pi
⁢
1
-
1
)
2
<
pi
⁢
2
<
n
·
pi
⁢
1
[
Formula
⁢
5
]
or
n
·
(
pi
⁢
1
-
1
)
2
>
pi
⁢
2
,
[
Formula
⁢
6
]
wherein pi1 is the first pitch; pi1-1 is the first prime; pi2 is the second pitch; and n is a natural number.

### Claim 12 (depends on 11)

The optical film of claim 11, wherein an absolute value of a difference of a refractive index of the pyramid pattern layer and a refractive index of the first prism pattern layer is 0.2 or less.

### Claim 13

A backlight unit comprising:
an edge type light source; and
an optical film disposed over the light source, the optical film comprising:
a first sheet including a first base portion; a pyramid pattern layer including a plurality of pyramid patterns formed on a first surface of the first base portion wherein each pyramid pattern has a first pitch corresponding to a length of a first side of a pyramid base of the pyramid pattern and a first prime pitch corresponding to a diagonal length of the pyramid base of the pyramid pattern; and a first prism pattern layer including a plurality of first prisms patterns formed on a second surface of the first base portion wherein each first prism pattern has a second pitch corresponding to a prism base length of the first prism pattern,
wherein ridges of the plurality of the first prism patterns are formed along a first direction and a direction extended from the side of the pyramid base of the pyramid pattens forms an angle with the first direction in a range of 0° or greater and 45° or less; and
wherein the optical film satisfies either Formula 5 or Formula 6:
n
·
(
pi
⁢
1
-
1
)
2
<
pi
⁢
2
<
n
·
pi
⁢
1
[
Formula
⁢
5
]
or
n
·
(
pi
⁢
1
-
1
)
2
>
pi
⁢
2
,
[
Formula
⁢
6
]
wherein pi1 is the first pitch; pi1-1 is the first prime; pi2 is the second pitch; and n is a natural number.

### Claim 14 (depends on 13)

The backlight unit of claim 13, wherein an absolute value of a difference of a refractive index of the pyramid pattern layer and a refractive index of the first prism pattern layer is 0.2 or less.