# US 11,906,847 B2 · Optical film and back light unit including the same

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- Number: US 11,906,847 B2
- Document ID: US11906847B2
- Status: Granted
- Kind: B2
- Application number: 17/950,896
- Filed: 2022-09-22
- Published: 2023-07-20
- Granted: 2024-02-20
- Earliest claimed: 2021-09-23
- Assignees: Lms Co., Ltd.
- Applicants: LMS Co., Ltd.
- Inventors: Hyeonuk Park; Byeonghun Lee
- Web page: https://patentgrep.com/patent/US11906847B2

## CPC

- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02B 6/0023: {provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 6/0081: {Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging}
- G02F 1/133603: {with LEDs}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G02F 1/133608: {including particular frames or supporting means}
- G02F 2201/56: Substrates having a particular shape, e.g. non-rectangular
- 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

A backlight unit includes a light source, a color conversion sheet disposed above the light source for converting a color of light emitted from the light source, and at least one optical film is disposed over the color conversion sheet. The one optical film has a base film, a first pattern layer including first patterns on one surface of the base film, and a second pattern layer disposed on the other surface of the base film and including second patterns different from the first patterns.

## Claims

### Claim 1

A backlight unit comprising:
a light source;
a color conversion sheet disposed above the light source for converting a color of light emitted from the light source; and
an optical film disposed over the color conversion sheet, the optical film comprising:
a base film;
a first pattern layer including a first pattern of a plurality of prisms formed on a first surface of the base film and arranged parallelly in a first direction; and
a second pattern layer including a second pattern of a plurality of pyramids including a plurality of rows in a second direction and a plurality of columns in a third direction perpendicular to the second direction and formed on a second surface of the base film,
wherein the second direction is misaligned to the first direction to form an angle in a range of greater than 0° to 45° or less.

### Claim 2 (depends on 1)

The backlight unit according to claim 1, wherein the pyramids have a size gradually increasing in a P1 direction toward to the color conversion sheet, and the prisms have a size gradually decreasing in a P2 direction opposite to the direction P1 to the color conversion sheet.

### Claim 3 (depends on 1)

The backlight unit according to claim 1, further comprising:
a first prism sheet disposed on the optical film; and
a second prism sheet disposed on the optical film,
wherein the first prism sheet and the second prism sheet having a plurality of prisms are stacked together and a pattern of the first prism and the second prism are arranged in a different direction each other.

### Claim 4 (depends on 3)

The backlight unit according to claim 3, wherein the first prism sheet and the second prism sheet are laminated.

### Claim 5 (depends on 3)

The backlight unit according to claim 3, further comprising: a second optical film disposed on the first optical film, wherein the second optical film comprises:
a second base film;
a third pattern layer having a plurality of prisms on one surface of the second base film; and
a fourth pattern layer disposed on the other surface of the second base film and having a fourth pattern different from the third pattern,
wherein the fourth pattern layer comprises a plurality of pyramids.

### Claim 6 (depends on 1)

The backlight unit according to claim 1, wherein:
a cross-section of the prism of the first pattern layer is a first triangular shape, and a cross-section of the pyramid of the second pattern layer is a second triangular shape,
the prism of the first pattern layer forms a first apex angle defined as an angle between two opposing sides among three sides of the first triangular shape,
the first apex angle is in a range of 70° to 150°,
the pyramid of the second pattern layer forms a second apex angle defined as an angle between two opposing sides of the four sides of the pyramid shape, and
the second apex angle is in a range of 70° to 150°.

### Claim 7 (depends on 1)

The backlight unit according to claim 1, wherein:
the second pattern layer includes a plurality of line patterns formed in parallel with respect to one pyramid surface of the pyramid;
each of the plurality of line patterns is in an interval of 10 gm or less; and
the plurality of line patterns is formed in a pattern where 10 or less lines are arranged side by side on the one pyramid surface.

### Claim 8 (depends on 1)

The backlight unit according to claim 1, wherein the second pattern layer further includes a barrier rib formed between the pyramids, and wherein the barrier rib has a planar section having a size of 30% or less with respect to a pitch of the pyramids.

### Claim 9

An optical film comprising:
a base film;
a first pattern layer including a first pattern of a plurality of prisms formed on a first surface of the base film and arranged parallelly in a first direction; and
a second pattern layer including a second pattern of a plurality of pyramids including a plurality of rows in a second direction and a plurality of columns in a third direction perpendicular to the second direction and formed on a second surface of the base film,
wherein the second direction is misaligned to the first direction to form an angle in a range of greater than 0° to 45° or less.

### Claim 10 (depends on 9)

The optical film according to claim 9, wherein the second pattern of the plurality of the pyramids are formed to be intaglio.

### Claim 11 (depends on 10)

The optical film according to claim 10, wherein the second pattern layer further includes a barrier rib formed between the pyramids, and wherein the barrier rib has a planar section having a size of 30% or less with respect to a pitch of the pyramids.

### Claim 12 (depends on 9)

The optical film according to claim 9, wherein a cross-section of the prism of the first pattern layer is a first triangular shape, and wherein a cross-section of the pyramid of the second pattern layer is a second triangular shape.

### Claim 13 (depends on 12)

The optical film according to claim 12, wherein the prism of the first pattern layer forms a first apex angle defined as an angle between two opposing sides among three sides of the first triangular shape, and wherein the first apex angle is in a range of 70° to 150°.

### Claim 14 (depends on 12)

The optical film according to claim 12, wherein one or more of the pyramids of the second pattern layer form a second apex angle defined as an angle between two opposing sides of the four sides of the pyramid shape, and wherein the second apex angle is in a range of 70° to 150°.

### Claim 15 (depends on 9)

The optical film according to claim 9, wherein the second pattern layer includes a plurality of line patterns formed in parallel with respect to one pyramid surface of one of the plurality of the pyramids.

### Claim 16 (depends on 15)

The optical film according to claim 15, wherein each of the plurality of line patterns is in an interval of 10 μm or less.

### Claim 17 (depends on 15)

The optical film according to claim 15, wherein the plurality of line patterns is formed in a pattern, and wherein 10 or less lines are arranged side by side on the one pyramid surface.