# US 2017/0285247 A1 · LIQUID CRYSTAL DISPLAY COMPRISING K-Si-F-BASED PHOSPHORS AND COLOR GAMUT ENHANCING FILM

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- Number: US 2017/0285247 A1
- Document ID: US20170285247A1
- Status: Published application
- Kind: A1
- Application number: 15/468,821
- Filed: 2017-03-24
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: SKC Haas Display Films Co., Ltd.
- Applicants: SKC Haas Display Films Co., Ltd.
- Inventors: Hong Youl CHO; Kyoo Choong CHO; Hyun Cheol NAM
- Web page: https://patentgrep.com/patent/US20170285247A1

## CPC

- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02B 1/10: Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence)
- G02B 6/0051: {Diffusing sheet or layer}
- G02F 1/133514: {Colour filters}
- G02F 1/133528: {Polarisers}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02F 1/133507: {Films for enhancing the luminance}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 2201/52: RGB geometrical arrangements
- G02F 2202/04: dye
- G02F 2202/28: Adhesive materials or arrangements
- 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 disclosure relates to a liquid crystal display comprising K—Si—F-based phosphors and a color gamut enhancing film, wherein the liquid crystal display of the present invention can improve a color gamut by transmitting pure RGB wavelengths emitted from a light source as much as possible and absorbing unnecessary wavelengths other than the RGB wavelengths.

## Claims

### Claim 1

A liquid crystal display comprising a backlight unit and a liquid crystal panel,
wherein the backlight unit comprises a white emitting device package comprising K—Si—F-based phosphors, and
the backlight unit, the liquid crystal panel, or both of the backlight unit and the liquid crystal panel comprise one or more of a coating layer or an adhesive layer, where the one or more of the coating layer or the adhesive layer comprise at least one type of an absorption dye configured to absorb a specific wavelength band.

### Claim 2 (depends on 1)

The liquid crystal display of claim 1, wherein the liquid crystal panel sequentially comprises an upper polarizing plate, a first adhesive layer, a liquid crystal cell, a second adhesive layer, and a lower polarizing plate, and
the first adhesive layer, the second adhesive, or both of them comprise at least one type of an absorption dye configured to absorb a specific wavelength band.

### Claim 3 (depends on 1)

The liquid crystal display of claim 1, wherein the backlight unit sequentially comprises a dual brightness enhancement film (DBEF) or an upper diffusion sheet, a prism sheet, a lower diffusion sheet, a light guide plate, and a reflective plate, and
the backlight unit comprises a coating layer on at least one position of one side or both sides of the dual brightness enhancement film or the upper diffusion sheet, one side or both sides of the prism sheet, one side or both sides of the lower diffusion sheet, one side or both sides of the light guide plate, and one side of the reflective plate,
wherein the coating layer comprises at least one type of an absorption dye configured to absorb a specific wavelength band.

### Claim 4 (depends on 1)

The liquid crystal display of claim 1, wherein the absorption dye has a main absorption wavelength band other than RGB.

### Claim 5 (depends on 1)

The liquid crystal display of claim 1, wherein the absorption dye has a main absorption wavelength band of 380 nm to 430 nm, 480 nm to 510 nm, or 560 nm to 600 nm.

### Claim 6 (depends on 1)

The liquid crystal display of claim 1, wherein the absorption dye is selected from the group consisting of a hydroxy benzotriazole (HB)-based dye, a tris-resorcinol-triazine chromophore (TRTC)-based dye, a hydroxylphenyl-benzotriazole chromophore (HBC)-based dye, a pyrrole methine-based dye, a rhodamine-based dye, a boron dipyrromethene-based dye, a tetraaza porphyrin-based dye, a squaraine-based dye, and a cyanine-based dye.

### Claim 7 (depends on 6)

The liquid crystal display of claim 6, wherein the absorption dye is selected from the group consisting of the hydroxy benzotriazole-based dye, the cyanine-based dye, the pyrrole methine-based dye, and the tetraaza porphyrin-based dye.

### Claim 8 (depends on 7)

The liquid crystal display of claim 7, wherein the absorption dye is a combination of the hydroxy benzotriazole-based dye, the cyanine-based dye, and the tetraaza porphyrin-based dye.

### Claim 9 (depends on 1)

The liquid crystal display of claim 1, wherein the absorption dye is comprised in an amount of 0.01 wt % to 10 wt % based on the total weight of the coating layer or the adhesive layer.

### Claim 10 (depends on 1)

The liquid crystal display of claim 1, wherein the coating layer or the adhesive layer has a thickness of 2 to 100 μm.

### Claim 11 (depends on 1)

The liquid crystal display of claim 1, wherein the white emitting device package comprises:
a resin layer comprising K—Si—F-based phosphors; and
a light emitting device emitting near ultraviolet ray or blue light for exciting the K—Si—F-based phosphors.

### Claim 12 (depends on 11)

The liquid crystal display of claim 11, wherein the resin layer is formed via molding on the light emitting device, and the resin layer comprises a light transmitting resin and the K—Si—F-based phosphors dispersed in the light transmitting resin.

### Claim 13 (depends on 12)

The liquid crystal display of claim 12, wherein the light transmitting resin is at least one selected from the group consisting of an epoxy resin, a silicone resin, a polyimide resin, a urea resin and an acryl resin.

### Claim 14 (depends on 12)

The liquid crystal display of claim 12, wherein the resin layer comprises 0.01 to 20 parts by weight of the K—Si—F-based phosphors based on 100 parts by weight of the light transmitting resin.

### Claim 15 (depends on 11)

The liquid crystal display of claim 11, wherein the K—Si—F-based phosphor is a K2SiF6:Mn red phosphor.

### Claim 16 (depends on 15)

The liquid crystal display of claim 15, wherein the light emitting device emits blue light in a wavelength region of 350 to 460 nm, and the white emitting device package emits white light in a wavelength region of 420 to 700 nm.