# US 2019/0377229 A1 · Display device

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- Number: US 2019/0377229 A1
- Document ID: US20190377229A1
- Status: Published application
- Kind: A1
- Application number: 16/261,436
- Filed: 2019-01-29
- Published: 2019-12-12
- Earliest claimed: 2018-06-11
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Hee Kwang SONG; Ju Young YOON; Young Keun LEE
- Web page: https://patentgrep.com/patent/US20190377229A1

## CPC

- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- H10H 20/8512: {Wavelength conversion materials}
- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- G02B 6/0043: {provided on the surface of the light guide}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02B 6/0061: {to provide homogeneous light output intensity}
- G02B 6/0073: {Light emitting diode [LED]}
- G02F 1/133603: {with LEDs}
- H10H 20/8513: {having two or more wavelength conversion materials}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- H10H 20/8506: {Containers}
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 20/882: {Scattering means (H10H20/82 takes precedence)}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A backlight assembly includes an optical member that includes a light guide plate and a wavelength conversion layer disposed on the light guide plate; and a light source disposed on one side of the light guide plate. The wavelength conversion layer includes scattering particles having a particle size of 200 nm or less, and the scattering particles are of an anatase crystal type of titanium dioxide (TiO2).

## Claims

### Claim 1

A backlight assembly comprising:
an optical member including a light guide plate and a wavelength conversion layer that is disposed on the light guide plate; and
a light source disposed on one side of the light guide plate,
wherein the wavelength conversion layer includes scattering particles having a particle size of 200 nm or less, and the scattering particles are of an anatase crystal type of titanium dioxide (TiO2).

### Claim 2 (depends on 1)

The backlight assembly of claim 1,
wherein the light source provides first light of a first wavelength to the light guide plate, and the light conversion layer includes first wavelength conversion particles that convert the first light of the first wavelength to light of a second wavelength and second wavelength conversion particles that convert the first light of the first wavelength to light of a third wavelength.

### Claim 3 (depends on 2)

The backlight assembly of claim 2,
wherein the light source provides second light of a fourth wavelength that is different from the first wavelength to the light guide plate, the first wavelength conversion particles convert the second light to the light of the second wavelength, and the second wavelength conversion particles convert the second light to the light of the third wavelength.

### Claim 4 (depends on 3)

The backlight assembly of claim 3,
wherein the first wavelength and the fourth wavelength are within a wavelength range of blue light or near ultraviolet light.

### Claim 5 (depends on 4)

The backlight assembly of claim 4,
wherein the first wavelength is 320 nm to 420 nm, and the fourth wavelength is 420 nm to 470 nm.

### Claim 6 (depends on 4)

The backlight assembly of claim 4,
wherein the light source includes a light emitting element that emits the first light and third wavelength conversion particles that convert the first light of the first wavelength to the second light of the fourth wavelength.

### Claim 7 (depends on 2)

The backlight assembly of claim 2,
wherein the second wavelength is within a wavelength range of green light, and the third wavelength is within a wavelength range of red light.

### Claim 8 (depends on 7)

The backlight assembly of claim 7,
wherein the first wavelength conversion particles include quantum dots, and the second wavelength conversion particles include a KSF fluorescent material.

### Claim 9 (depends on 2)

The backlight assembly of claim 2,
wherein the wavelength conversion layer further includes third wavelength conversion particles that convert the first light to second light of a fourth wavelength.

### Claim 10 (depends on 9)

The backlight assembly of claim 9,
wherein the first wavelength conversion particles convert the second light of the fourth wavelength to the light of the second wavelength, and the second wavelength conversion particles convert the second light of the fourth wavelength to light of the third wavelength.

### Claim 11 (depends on 1)

The backlight assembly of claim 1,
wherein a volumetric ratio of the scattering particles in the wavelength conversion layer is less than 5%.

### Claim 12 (depends on 11)

The backlight assembly of claim 11,
wherein a reflectance of the scattering particles to light of a wavelength of 400 nm is 80% or more.

### Claim 13 (depends on 1)

The backlight assembly of claim 1,
wherein the optical member further includes a low refractive layer disposed between the light guide plate and the wavelength conversion layer, and
the light guide plate, the low refractive layer, and the wavelength conversion layer are integrally coupled with each other.

### Claim 14 (depends on 13)

The backlight assembly of claim 13, further comprising:
a passivation layer covering the wavelength conversion layer and the low refractive layer.

### Claim 15 (depends on 1)

The backlight assembly of claim 1,
wherein the light guide plate includes glass.

### Claim 16

A display device, comprising:
a backlight assembly including an optical member that includes a light guide plate and a wavelength conversion layer that is disposed on the light guide plate, and a light source disposed on one side of the light guide plate; and
a display panel disposed over the backlight assembly,
wherein the wavelength conversion layer includes scattering particles having a particle size of 200 nm or less, and the scattering particles are of an anatase crystal type of titanium dioxide (TiO2).

### Claim 17 (depends on 16)

The display device of claim 16,
wherein the light source provides first light of a first wavelength to the light guide plate, and
the light conversion layer includes first wavelength conversion particles that convert the first light of the first wavelength to light of a second wavelength and second wavelength conversion particles that convert the first light of the first wavelength to light of a third wavelength.

### Claim 18

An optical member, comprising:
first wavelength conversion particles that convert first light of a first wavelength to light of a second wavelength;
second wavelength conversion particles that convert the first light of the first wavelength to light of a third wavelength; and
a wavelength conversion layer including scattering particles having a particle size of 200 nm or less,
wherein the scattering particles are of an anatase crystal type of titanium dioxide (TiO2).

### Claim 19 (depends on 18)

The optical member of claim 18, further comprising:
a low refractive layer disposed under the wavelength conversion layer; and
a light guide plate disposed under the low refractive layer and including glass,
wherein the light guide plate, the low refractive layer, and the wavelength conversion layer are integrally coupled with each other.

### Claim 20 (depends on 19)

The optical member of claim 19,
wherein the wavelength conversion layer further includes third wavelength conversion particles that convert the first light of the first wavelength to second light of a fourth wavelength, and
the first wavelength conversion particles convert the second light of the fourth wavelength to the light of the second wavelength, and the second wavelength conversion particles convert the second light of the fourth wavelength to the light of the third wavelength.