Photoluminescence device and display panel including the same

Patent metadata

Field	Value
Publication number	US-12044870-B2
Application number	US-202218091316-A
Country	US
Kind code	B2
Filing date	Dec 29, 2022
Priority date	Dec 5, 2016
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

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 continuously extending in the surface direction to overlap the first and the second color conversion patterns. The 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 and first scattering particles excluding quantum dots 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 and second scattering particles excluding quantum dots 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 comprising:
a first color filter overlapping the first color conversion pattern; and
a second color filter overlapping 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; and
a second index of refraction layer disposed adjacent two intersecting sides of at least one of the first and second color conversion patterns and having a refractive index lower than refractive indexes of the first and second color conversion patterns.

2. The display panel of claim 1 , wherein the first index of refraction layer has a refractive index lower than refractive indexes of the first and second color conversion patterns.

3. The display panel of claim 2 , wherein the first index of refraction layer is configured to reflect light passing through the first and second color conversion patterns according to an incident angle.

4. The display panel of claim 1 , wherein the first and second color conversion patterns are disposed between the first index of refraction layer and the second index of refraction layer.

5. The display panel of claim 1 , wherein the plurality of color filters are arranged in a surface direction of the display panel, and the first index of refraction layer continuously extends in the surface direction to overlap the first and the second color conversion patterns.

6. The display panel of claim 1 , wherein the first color filter is configured to selectively pass light of a first range of wavelengths transmitted through the first color conversion pattern, and the second color filter is configured to selectively pass light of a second range of wavelengths transmitted through the first color conversion pattern, and
wherein the first range and the second range are different from each other.

7. The display panel of claim 1 , wherein
the second wavelength is different from the first wavelength.

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

9. The display panel of claim 1 , further comprising a light reflection layer disposed between the plurality of color conversion patterns and the light emitting device.

10. The display panel of claim 9 , wherein the light reflection layer is configured to selectively reflect light of a particular range of wavelengths.

11. The display panel of claim 9 , wherein the light reflection layer covers the plurality of color conversion patterns.

12. The display panel of claim 9 , wherein the second index of refraction layer is disposed between the plurality of color conversion patterns and the light reflection layer.

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

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

15. The display panel of claim 14 , 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 and comprise organic light emitting diodes.

16. The display panel of claim 15 , 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.

17. The display panel of claim 1 , further comprising an overcoat layer disposed between the light emitting device and the plurality of color conversion patterns.

18. The display panel of claim 1 , wherein the first index of refraction layer directly contacts at least one of the first and second color conversion patterns.

19. The display panel of claim 1 , wherein the second index of refraction layer surrounds three sides of at least one of the first and second color conversion patterns.

20. 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; and
a second color conversion pattern including second quantum dots to convert the light of the light emitting device to have a second wavelength;

a plurality of color filters disposed on the plurality of color conversion patterns, the plurality of color filters comprising:
a first color filter overlapping the first color conversion pattern; and
a second color filter overlapping 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; and
a second index of refraction layer disposed adjacent two intersecting sides of at least one of the first and second color conversion patterns and having a refractive index lower than refractive indexes of the first and second color conversion patterns.

21. The display panel of claim 20 , wherein the second index of refraction layer surrounds three sides of at least one of the first and second color conversion patterns.

Assignees

• Samsung Display Co Ltd

Inventors

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

Classifications

• H10K50/858

  comprising refractive means, e.g. lenses · CPC title

• G02F1/133512

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

• G02F1/133514

  Colour filters · CPC title

• G02B26/002 Primary

  the movement or the deformation controlling the frequency of light, e.g. by Doppler effect · CPC title

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title