# US 10,761,363 B2 · Display device and method of fabricating the display device

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- Number: US 10,761,363 B2
- Document ID: US10761363B2
- Status: Granted
- Kind: B2
- Application number: 15/971,523
- Filed: 2018-05-04
- Published: 2019-01-24
- Granted: 2020-09-01
- Earliest claimed: 2017-07-20
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Soodong Kim; Jinwon Kim; Taeho Kim; Minki Nam; Kyoungwon Park
- Web page: https://patentgrep.com/patent/US10761363B2

## CPC

- G02F 1/133603: {with LEDs}
- G02B 6/00: Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133514: {Colour filters}
- G02F 1/133528: {Polarisers}
- G02F 1/133602: {Direct backlight}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0088: {of the light guide or other optical sheets in the package}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 2202/36: Micro- or nanomaterials
- G02F 2203/055: wavelength filtering
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/873: {Encapsulations}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A method of fabricating a display device may include the following steps: patterning a light blocking layer on a first surface of a first substrate, forming a color filter layer on a second surface of the first substrate opposite the first surface after the patterning of the light blocking layer, and forming a light conversion layer including a plurality of conversion filters on the first surface of the first substrate after the forming of the color filter layer. Each of the conversion filters may include a plurality of conversion particles, and the color filter layer may be formed to selectively transmit light emitted from each of the conversion filters.

## Claims

### Claim 1

A method of fabricating a display device, comprising:
patterning a light blocking layer on a first surface of a first substrate;
forming a color filter layer on a second surface of the first substrate opposite the first surface, after the patterning of the light blocking layer; and
forming a light conversion layer including a plurality of conversion filters and a plurality of colorless or gray members, on the first surface of the first substrate, after the forming of the color filter layer,
wherein a thickness of one of the colorless or gray members in a direction perpendicular to the first surface of the first substrate is equal to a thickness of one of the conversion filters in the direction,
wherein each of the conversion filters comprises a plurality of conversion particles, and
wherein the color filter layer comprises a first color filter and a second color filter both directly contacting the second surface, wherein the first color filter is configured to absorb a portion of a first-color light and a third-color light, and wherein the second color filter is configured to absorb a portion of the first-color light and a second-color light.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first-color light is a blue light,
the second-color light is a red light, and
the third-color light is a green light.

### Claim 3 (depends on 1)

The method of claim 1, wherein the light blocking layer comprises a metallic material.

### Claim 4 (depends on 1)

The method of claim 1, wherein the conversion filters comprise:
a first conversion filter including first-type conversion particles for converting a first-color light into a second-color light; and
a second conversion filter including second-type conversion particles for converting the first-color light into a third-color light.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
forming a pixel definition layer on a base substrate; forming a light emitting layer on a region of the base substrate exposed by the pixel definition layer; and
positioning the first substrate and the base substrate to overlap each other.

### Claim 6 (depends on 1)

The method of claim 1, further comprising forming a polarization layer on the light conversion layer.

### Claim 7 (depends on 1)

The method of claim 1, wherein the forming of the color filter layer comprises:
turning upside down the first substrate; and
forming the first color filter on the second surface of the first substrate.

### Claim 8 (depends on 7)

The method of claim 7, wherein the forming of the color filter layer further comprises forming an encapsulation layer on the first color filter.

### Claim 9 (depends on 7)

The method of claim 7, wherein the first color filter has a thickness of 1 μm or thicker.

### Claim 10 (depends on 1)

The method of claim 1, wherein the forming of the light conversion layer comprises:
turning upside down the first substrate;
forming the conversion filters on portions of the first surface of the first substrate exposed by the light blocking layer; and
forming an over-coating layer on the conversion filters.

### Claim 11 (depends on 10)

The method of claim 10, wherein each of the conversion filters has a thickness of 7 μm or thicker.

### Claim 12

A display device, comprising a display module displaying an image using a first light,
wherein the display module comprises:
a first substrate including a first surface toward which the first light is incident and a second surface opposite the first surface;
a light blocking layer provided on the first surface;
a light conversion layer provided on portions of the first surface exposed by the light blocking layer, wherein the light conversion layer is configured to convert first-color light to a second-color light and a third-color light; and
a color filter layer provided on the second surface, wherein the color filter layer comprises a first color filter and a second color filter both directly contacting the second surface, wherein the first color filter is configured to absorb a portion of the third-color light, and wherein the second color filter is configured to absorb a portion of the second-color light.

### Claim 13 (depends on 12)

The display device of claim 12, further comprising:
a light source configured to provide the first-color light to the display module; and
a liquid crystal layer overlapping the first substrate.

### Claim 14 (depends on 12)

The display device of claim 12, further comprising:
a base substrate overlapping the first substrate; and
a light emitting layer provided on the base substrate and configured to generate the first-color light.

### Claim 15 (depends on 12)

The display device of claim 12, further comprising: an encapsulation layer covering the first color filter and the second color filter, wherein a portion of the encapsulation layer is positioned between the first color filter and the second color filter and directly contacts each of the first color filter and the second color filter.

### Claim 16 (depends on 12)

The display device of claim 12, wherein each of the first color filter and the second color filter has a thickness of 1 μm or thicker.

### Claim 17 (depends on 12)

The display device of claim 12, further comprising: an over-coating layer, wherein the light conversion layer comprises:
a first conversion filter including first-type conversion particles for converting a first portion of the first-color light to the second-color light; and
a second conversion filter including second-type conversion particles for converting a second portion of the first-color light to the third-color light, and
wherein the over-coating layer covers the first conversion filter and the second conversion filter.

### Claim 18 (depends on 17)

The display device of claim 17, wherein the display module further comprises a wire grid polarizer provided on the over-coating layer.