# US 10,120,110 B2 · Wavelength conversion sheet, backlight unit, and phosphor protective film

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- Number: US 10,120,110 B2
- Document ID: US10120110B2
- Status: Granted
- Kind: B2
- Application number: 15/282,333
- Filed: 2016-09-30
- Published: 2017-01-19
- Granted: 2018-11-06
- Earliest claimed: 2014-04-04
- Assignees: Toppan Printing Co., Ltd.
- Applicants: Toppan Printing Co., Ltd.
- Inventors: Osamu Tokinoya; Ikuno Higashi
- Web page: https://patentgrep.com/patent/US10120110B2

## CPC

- G02B 5/0226: {having particles on the surface}
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2457/202: LCD, i.e. liquid crystal displays
- G02F 2202/36: Micro- or nanomaterials
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A wavelength conversion sheet includes a phosphor, and one or more barrier films that seal the phosphor. At least one of the barrier films includes a coating layer having an optical function. The coating layer is provided to a surface of the barrier film.

## Claims

### Claim 1

A wavelength conversion sheet comprising:
a phosphor,
one or more barrier films that seal the phosphor, the one or more barrier films each including a first base material, and
one or more plastic films each including a second base material, the one or more plastic films and the one or more barrier films being laminated together so as to provide a barrier layer between the first base material and the second base material,
wherein at least one of the barrier films includes a coating layer having an optical function, the coating layer being structured to reduce at least interference fringes and being provided on the second base material,
wherein the coating layer includes the binder resin layer and fine particles,
wherein the coating layer has micro-irregularities on a surface thereof,
wherein the one or more barrier films comprises the coating layer, the second base material, an adhesive layer, the barrier layer, and the first base material,
wherein the coating layer is provided above a surface of the second base material on a side opposite to the first base material, and
wherein the barrier film is disposed above the phosphor.

### Claim 2 (depends on 1)

The wavelength conversion sheet of claim 1, wherein the binder resin layer has a thickness between 0.1 to 20 μm.

### Claim 3 (depends on 2)

The wavelength conversion sheet of claim 2, wherein the fine particles are at least either organic particles or inorganic particles.

### Claim 4 (depends on 2)

The wavelength conversion sheet of claim 2, wherein the fine particles have an average particle size in a range of 0.5 to 30 μm.

### Claim 5 (depends on 4)

The wavelength conversion sheet of claim 4, wherein:
the fine particles of the coating layer are partially exposed from the surface of the binder resin layer.

### Claim 6 (depends on 1)

The wavelength conversion sheet of claim 1, wherein at least one of the barrier films includes one or more barrier layers.

### Claim 7 (depends on 6)

The wavelength conversion sheet of claim 6, wherein the barrier layer includes an inorganic thin film layer laminated on one surface of the first base material, and a gas barrier cover layer laminated on the inorganic thin film layer.

### Claim 8 (depends on 6)

The wavelength conversion sheet of claim 6, wherein the barrier layer includes a first inorganic thin film layer laminated on one surface of the first base material, a first gas barrier cover layer laminated on the first inorganic thin film layer, a second inorganic thin film layer laminated on the first gas barrier cover layer, and a second gas barrier cover layer laminated on the second inorganic thin film layer.

### Claim 9 (depends on 6)

The wavelength conversion sheet of claim 6, wherein the first base material is a polyethylene terephthalate film having an acid value of 25 or less.

### Claim 10 (depends on 1)

The wavelength conversion sheet of claim 1, wherein the barrier film including the coating layer has a total light transmittance of 85% or more.

### Claim 11 (depends on 1)

A backlight unit comprising:
a light emitting device formed of a blue LED; and
the wavelength conversion sheet of claim 1 disposed on the light emitting device.

### Claim 12

A phosphor protective film that protects quantum dot phosphors comprising:
one or more barrier films each including a first base material, and one or more barrier layers provided on at least one surface of the first base material; and
one or more plastic films each including a second base material, wherein:
the barrier film and the plastic film are laminated so that the barrier layer is sandwiched between the first base material and the second base material,
at least one of the barrier film and the plastic film has a coating layer that improves optical properties, and is structured to reduce at least interference fringes; and
the coating layer is provided on a surface of the second base material,
wherein the coating layer includes the binder resin layer and fine particles,
wherein the coating layer has micro-irregularities on a surface thereof,
wherein the coating layer includes the binder resin layer and fine particles,
wherein the coating layer has micro-irregularities on a surface thereof,
wherein the one or more barrier films comprises the coating layer, the second base material, an adhesive layer, the barrier layer, and the first base material,
wherein the coating layer is provided above a surface of the second base material on a side opposite to the first base material, and
wherein the barrier film is disposed above the quantum dot phosphors.

### Claim 13 (depends on 12)

The phosphor protective film of claim 12, wherein the barrier layer includes an inorganic thin film layer laminated on one surface of the first base material, and a gas barrier cover layer laminated on the inorganic thin film layer.

### Claim 14 (depends on 12)

The phosphor protective film of claim 12, wherein the barrier layer includes a first inorganic thin film layer laminated on one surface of the first base material, a first gas barrier cover layer laminated on the first inorganic thin film layer, a second inorganic thin film layer laminated on the first gas barrier cover layer, and a second gas barrier cover layer laminated on the second inorganic thin film layer.

### Claim 15 (depends on 12)

The phosphor protective film of claim 12, wherein the barrier film and the plastic film are bonded and laminated to each other by the adhesive layer, the adhesive layer comprising any of an acrylic resin tackifier, a urethane adhesive, and an ester adhesive.

### Claim 16 (depends on 12)

The phosphor protective film of claim 12, wherein the first base material is a polyethylene terephthalate film having an acid value of 25 or less.

### Claim 17 (depends on 12)

The phosphor protective film of claim 12, wherein the gas barrier cover layer contains at least one or more members of a hydroxyl group-containing polymer compound, a metal alkoxide, a metal alkoxide hydrolysate, and a metal alkoxide polymer.

### Claim 18 (depends on 12)

A wavelength conversion sheet comprising a phosphor layer that contains quantum dot phosphors, and one or more of the phosphor protective films of claim 12 laminated on at least one surface of the phosphor layer.

### Claim 19 (depends on 18)

The wavelength conversion sheet of claim 18, wherein the phosphor protective film is laminated so that the first base material of the barrier film faces the phosphor layer.

### Claim 20 (depends on 19)

The wavelength conversion sheet of claim 19, wherein:
the phosphor protective film includes a coating layer that improves optical properties; and
the coating layer is provided on a surface of the plastic film, the surface of the plastic film being opposite to a surface that faces the phosphor layer.

### Claim 21 (depends on 19)

A backlight unit comprising a light source, a light guide plate, and the wavelength conversion sheet of claim 19.

### Claim 22 (depends on 18)

The wavelength conversion sheet of claim 18, wherein the phosphor protective film is laminated so that the plastic film faces the phosphor layer.

### Claim 23 (depends on 22)

The wavelength conversion sheet of claim 22, wherein:
the phosphor protective film includes a coating layer having an optical function; and
the coating layer is provided on a surface of the barrier film, the surface of the barrier film being opposite to a surface that faces the phosphor layer.