# US 11,029,544 B2 · Display device and method for manufacturing the same

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- Number: US 11,029,544 B2
- Document ID: US11029544B2
- Status: Granted
- Kind: B2
- Application number: 15/648,997
- Filed: 2017-07-13
- Published: 2018-04-19
- Granted: 2021-06-08
- Earliest claimed: 2016-10-14
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jin Soo Jung; Young Gu Kim; Taek Joon Lee; Hye Lim Jang; Baek Kyun Jeon
- Web page: https://patentgrep.com/patent/US11029544B2

## CPC

- G02F 1/0063: {Optical properties, e.g. absorption, reflection or birefringence (materials for non-linear optics G02F1/355)}
- G02F 1/133502: {Antiglare, refractive index matching layers}
- G02F 1/133514: {Colour filters}
- G02F 1/133516: {Methods for their manufacture, e.g. printing, electro-deposition or photolithography}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes}
- G02F 1/133357: {Planarisation layers}
- G02F 1/133548: {Wire-grid polarisers}
- G02F 1/133565: {inside the LC elements, i.e. between the cell substrates}
- G02F 1/136281: {having a transmissive semiconductor substrate}
- G02F 2001/1635: {the pixel comprises active switching elements, e.g. TFT}
- G02F 2201/48: Flattening arrangements
- G02F 2203/055: wavelength filtering
- 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 display device including a first substrate, a pixel disposed on the first substrate and including first, second and third sub-pixel electrodes adjacent to each other, a second substrate spaced from the first substrate, a color conversion layer disposed on the second substrate and with a first wavelength conversion layer overlapping with the first sub pixel electrode and a second wavelength conversion layer overlapping with the second sub pixel electrode, a transmissive layer including a first sub-transmissive layer overlapping with the third sub-pixel electrode and a second sub-transmissive layer disposed between the first wavelength conversion layer and the second wavelength conversion layer, and a planarization layer disposed on the color conversion layer and the transmissive layer. Methods of manufacturing display devices having a flatter, planarization layer with reduced variations in thickness also is disclosed.

## Claims

### Claim 1

A display device comprising:
a first substrate;
a pixel disposed on the first substrate and including first, second and third sub-pixel electrodes adjacent to each other;
a second substrate spaced from the first substrate;
a color conversion layer disposed on the second substrate, the color conversion layer including a first wavelength conversion layer overlapping with the first sub pixel electrode and a second wavelength conversion layer overlapping with the second sub pixel electrode;
an inorganic layer disposed on the color conversion layer;
a transmissive layer disposed on the inorganic layer, the transmissive layer including a first sub-transmissive layer overlapping with the third sub-pixel electrode and a second sub-transmissive layer disposed between the first wavelength conversion layer and the second wavelength conversion layer; and
a planarization layer disposed on the color conversion layer and the transmissive layer,
wherein:
the first wavelength conversion layer, the second wavelength conversion layer, the first sub-transmissive layer, and the second sub-transmissive layer are disposed between the second substrate and the planarization layer;
the first sub-transmissive layer and the second sub-transmissive layer directly contact the planarization layer; and
the first wavelength conversion layer, the second wavelength conversion layer, the first sub-transmissive layer, and the second sub-transmissive layer directly contact the inorganic layer.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein:
the first wavelength conversion layer and the second wavelength conversion layer comprise quantum dots or phosphor
each of the first sub-transmissive layer and the second sub-transmissive layer includes a light-transmitting resin and scattering particles.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the first wavelength conversion layer is configured to receive a light of a first wavelength range and to convert the light of the first wavelength range into a light of a second wavelength range different from the first wavelength range, and
wherein the second wavelength conversion layer is configured to receive the light of the first wavelength range and to convert the light of the first wavelength range into a light of a third wavelength range different from the second wavelength range.

### Claim 4 (depends on 3)

The display device according to claim 3, wherein the transmissive layer is configured to transmit the light of the first wavelength range.

### Claim 5 (depends on 3)

The display device according to claim 3, further comprising:
a first filter configured to block the light of the first wavelength range and to transmit the light of the second wavelength range and the light of the third wavelength range,
wherein the first filter overlaps with the color conversion layer.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein the planarization layer comprises a first surface facing the first substrate and a second surface opposed to the first surface of the planarization layer, and
wherein variations in heights along the first surface of the planarization layer range from about 0 to about 40 nm.

### Claim 7 (depends on 1)

The display device according to claim 1, further comprising: a polarizing layer disposed on the planarization layer.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the polarizing layer is a wire grid polarizer.