Photoluminescence device and display panel including the same

Patent metadata

Field	Value
Publication number	US-11567248-B2
Application number	US-202016985153-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	Dec 5, 2016
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A display panel includes: a light emitting device to generate light; a plurality of color conversion patterns including: a first color conversion pattern including first scattering particles dispersed in the first color conversion pattern and configured to scatter the light of the light emitting device; and a second color conversion pattern including second scattering particles dispersed in the second color conversion pattern and configured to scatter the light of the light emitting device; a plurality of color filters including: a first color filter overlapping the first color conversion pattern; and a second color filter overlapping the second color conversion pattern; and a single, low index of refraction layer substantially continuously extending in the surface direction to overlap the first and the second color conversion patterns. The single, low index of refraction layer has a refractive index lower than refractive indexes of the first and second color conversion patterns.

First claim

What is claimed is:

1. A display panel comprising:
a light emitting device to generate light;
a plurality of color conversion patterns spaced apart from each other and arranged in a surface direction of the display panel, the plurality of color conversion patterns comprising:
a first color conversion pattern including first quantum dots to convert the light of the light emitting device to have a first wavelength, the first color conversion pattern further including first scattering particles dispersed in the first color conversion pattern and configured to scatter the light of the light emitting device without converting the light of the light emitting device; and
a second color conversion pattern including second quantum dots to convert the light of the light emitting device to have a second wavelength, the second color conversion pattern further including second scattering particles dispersed in the second color conversion pattern and configured to scatter the light of the light emitting device without converting the light of the light emitting device;

a plurality of color filters disposed on the plurality of color conversion patterns, the plurality of color filters arranged in the surface direction and comprising:
a first color filter overlapping the first color conversion pattern and configured to selectively pass light of a first range of wavelengths transmitted through the first color conversion pattern; and
a second color filter overlapping the second color conversion pattern and configured to selectively pass light of a second range of wavelengths transmitted through the second color conversion pattern;

a first index of refraction layer disposed between the first color conversion pattern and the first color filter and between the second color conversion pattern and the second color filter, the first index of refraction layer continuously extending in the surface direction to overlap the first and the second color conversion patterns; and
a second index of refraction layer having a refractive index lower than refractive indexes of the first and second color conversion patterns,
wherein the first index of refraction layer has a refractive index lower than refractive indexes of the first and second color conversion patterns to reflect light passing through the first and second color conversion patterns according to an incident angle, and
wherein the first and second color conversion patterns are disposed between the first index of refraction layer and the second index of refraction layer.

2. The display device of claim 1 , wherein
the second wavelength is different from the first wavelength.

3. The display device of claim 1 , wherein the first range and the second range are different from each other.

4. The display device of claim 1 , wherein the refractive index of the first index of refraction layer is lower than a refractive index of the color filter.

5. The display device of claim 1 , further comprising a light reflection layer disposed between the plurality of color conversion patterns and the light emitting device and configured to selectively reflect light of a particular range of wavelengths.

6. The display device of claim 5 , wherein the light reflection layer covers the plurality of color conversion patterns.

7. The display device of claim 1 , wherein the first index of refraction layer comprises transparent resin and microcavities.

8. The display panel of claim 1 , wherein the light emitting device comprises a plurality of light emitting layers arranged in the surface direction of the display panel to emit light based on an input image signal.

9. The display panel of claim 8 , wherein the light emitting device further comprises:
a substrate;
first electrodes disposed on the substrate;
a pixel defining layer to define pixel areas; and
a second electrode overlapping the first electrodes,
wherein the light emitting layers are disposed between the first electrodes and the second electrode in the pixel areas.

10. The display panel of claim 9 , wherein the light emitting device further comprises an encapsulation layer to cover the first electrodes, the pixel defining layer, the light emitting layers, and the second electrode.

11. The display panel of claim 10 , further comprising an overcoat layer disposed between the light emitting device and the plurality of color conversion patterns.

12. The display panel of claim 8 , wherein the light emitting layers comprise organic light emitting diodes.

13. A display panel comprising:
a light emitting device to generate light;
a plurality of color conversion patterns spaced apart from each other and arranged in a surface direction of the display panel, the plurality of color conversion patterns comprising:
a first color conversion pattern including first quantum dots to convert the light of the light emitting device to have a first wavelength, the first color conversion pattern further including first scattering particles dispersed in the first color conversion pattern; and
a second color conversion pattern including second quantum dots to convert the light of the light emitting device to have a second wavelength, the second color conversion pattern further including second scattering particles dispersed in the second color conversion pattern;

a plurality of color filters disposed on the plurality of color conversion patterns, the plurality of color filters arranged in the surface direction and comprising:
a first color filter overlapping the first color conversion pattern and configured to selectively pass light of a first range of wavelengths transmitted through the first color conversion pattern; and
a second color filter overlapping the second color conversion pattern and configured to selectively pass light of a second range of wavelengths transmitted through the second color conversion pattern;

a first index of refraction layer disposed between the first color conversion pattern and the first color filter and between the second color conversion pattern and the second color filter,
a second index of refraction layer having a refractive index lower than refractive indexes of the first and second color conversion patterns,
wherein the first index of refraction layer has a refractive index lower than refractive indexes of the first and second color conversion patterns, and
wherein the first and second color conversion patterns are disposed between the first index of refraction layer and the second index of refraction layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Baek Moonjung
• Yoon Seon-Tae
• Kwon Junghyun
• Kim Youngmin
• Park Haeil

Classifications

• G02F1/133617

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02B5/201 Primary

  in the form of arrays · CPC title