Display panel and electronic device including the same

Patent metadata

Field	Value
Publication number	US-12225800-B2
Application number	US-202217686934-A
Country	US
Kind code	B2
Filing date	Mar 4, 2022
Priority date	Mar 4, 2021
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A display panel may include a light emitting panel, and a color conversion panel. The light emitting panel is configured to emit incident light including a first light and a second light, a luminescent peak wavelength of the first light may be greater than or equal to about 450 nm and less than or equal to about 480 nm and a luminescent peak wavelength of the second light may be greater than or equal to about 500 nm and less than or equal to about 580 nm. The color conversion panel includes a color conversion layer including a conversion region, and optionally, a partition wall defining each region of the color conversion panel. The color conversion region includes a first region corresponding to a red pixel, and the first region include a first composite including a matrix and a plurality of luminescent nanostructures dispersed in the matrix, and in the UV-Vis absorption spectrum, an absorbance ratio at a wavelength of 520 nm with respect to a wavelength of 350 nm may be greater than or equal to about 0.04:1.

First claim

What is claimed is:

1. A display panel comprising a light emitting panel, and a color conversion panel with a surface opposite a surface of the light emitting panel,
wherein the light emitting panel is configured to emit incident light including a first light with a luminescent peak wavelength greater than or equal to about 450 nm and less than or equal to about 480 nm, and a second light with a luminescent peak wavelength of greater than or equal to about 500 nm and less than or equal to about 580 nm,
wherein the color conversion panel comprises a color conversion layer comprising a color conversion region, and optionally, a partition wall defining each region of the color conversion layer,
wherein the color conversion region comprises a first region corresponding to a red pixel, and the first region comprises a first composite comprising a matrix and a plurality of luminescent nanostructures dispersed in the matrix,
wherein a UV-Vis absorption spectrum of the plurality of the luminescent nanostructures includes a first absorption peak in a range of greater than or equal about 580 nanometers and less than or equal to about 630 nanometers, and
wherein in the UV-Vis absorption spectrum, an absorbance ratio at a wavelength of about 520 nm with respect to a wavelength of about 350 nm is greater than or equal to about 0.04:1.

2. The display panel of claim 1 , wherein an absorbance ratio at a wavelength of about 520 nm with respect to a wavelength of about 350 nm is less than 0.1:1.

3. The display panel of claim 1 , wherein the light emitting panel comprises a first electrode and a second electrode, and a light emission layer disposed between the first electrode and the second electrode, and optionally, wherein the light emission layer comprises an organic compound and a dopant.

4. The display panel of claim 2 , wherein the light emission layer comprises a first emission layer, and a second emission layer disposed on the first emission layer, wherein the first emission layer is configured to emit the first light, and the second emission layer is configured to emit the second light.

5. The display panel of claim 4 , wherein the light emission layer further comprises a first charge generation layer disposed between the first emission layer and the second emission layer, and optionally, a charge auxiliary layer disposed between the first electrode and the first emission layer, between the second electrode and the second emission layer, or between the first electrode and the first emission layer and between the second electrode and the second emission layer.

6. The display panel of claim 2 , wherein the emission layer comprises:
a second emission layer disposed between two first emission layers,
a first emission layer disposed between two second emission layers, or a combination thereof, and wherein the first emission layer is configured to emit the first light and the second emission layer is configured to emit the second light.

7. The display panel of claim 1 , wherein the incident light does not comprise red light having a wavelength of greater than or equal to about 600 nanometers and less than or equal to about 680 nanometers.

8. The display panel of claim 1 , wherein a maximum luminescent peak wavelength of the second light is greater than or equal to about 515 nanometers and less than or equal to about 530 nanometers, or wherein a maximum luminescent peak wavelength of the first light is greater than or equal to about 455 nanometers and less than or equal to about 465 nanometers.

9. The display panel of claim 1 , wherein a maximum luminescent peak wavelength of the luminescent nanostructures is greater than or equal to about 600 nanometers and less than or equal to about 660 nanometers.

10. The display panel of claim 1 , wherein the absorbance ratio at a wavelength of about 520 nanometers with respect to a wavelength of about 350 nanometers is greater than or equal to about 0.045:1.

11. The display panel of claim 1 , wherein the plurality of the luminescent nanostructures comprises a first semiconductor nanocrystal comprising a Group III-V compound and a second semiconductor nanocrystal comprising a zinc chalcogenide,
wherein the Group III-V compound comprises indium and phosphorus,
the zinc chalcogenide comprises zinc, selenium, and sulfur, and
the luminescent nanostructures do not comprise cadmium.

12. The display panel of claim 1 , wherein the plurality of the luminescent nanostructures comprises a mole ratio of sulfur to indium of greater than or equal to about 3 and less than or equal to about 6, and a mole ratio of sulfur to selenium of greater than or equal to about 0.69 and less than or equal to about 0.89:1.

13. The display panel of claim 1 , wherein the plurality of the luminescent nanostructures comprises a mole ratio of zinc to indium of greater than or equal to about 7.9:1 and less than or equal to about 12.4:1.

14. The display panel of claim 1 , wherein the luminescent nanostructures have a size of greater than or equal to about 6 nanometers and less than or equal to about 8.5 nanometers.

15. The display panel of claim 1 , wherein the plurality of the luminescent nanostructures comprises a mole ratio of indium to a sum of selenium and sulfur [In/(Se+S)] of greater than or equal to about 0.09:1 and less than or equal to about 0.23:1.

16. The display panel of claim 1 , wherein the first composite exhibits a light absorption for the incident light, as determined by the following equation, of greater than or equal to about 82%:
a light absorption (%)=[( BG−BG ′)/ BG ]×100(%)

BG: light dose of incident light
BG′: light dose of incident light having passed through the first composite.

17. The display panel of claim 1 , wherein the first composite exhibits a light absorption for the second light, as determined by the following equation, of greater than or equal to about 74%:
a light absorption (%)=[( G−G ′)/ G ]×100(%)

G: light dose of the second light
G′: light dose of the second light having passed through the first composite.

18. The display panel of claim 1 , wherein the first composite exhibits a light absorption for the first light, as determined by the following equation, of greater than or equal to about 88%:
a light absorption (%)=[( B−B ′)/ B ]×100(%)

B: light dose of the first light
B′: light dose of the first light having passed through the first composite.

19. The display panel of claim 1 , wherein the color conversion region further includes a second region corresponding to a green pixel, a third region corresponding to a blue pixel, or both the second and third regions.

20. An electronic device comprising the display panel of claim 1 .

21. A display panel comprising a light emitting panel, and a color conversion layer disposed on the light emitting panel,
wherein the light emitting panel is configured to emit incident light including a first light with a luminescent peak wavelength greater than or equal to about 450 nm and less than or equal to about 480 nm, and a second light with a luminescent peak wavelength of greater than or equal to about 500 nm and less than or equal to about 580 nm,
wherein the light emitting panel is configured to provide the incident light to the color conversion layer,
wherein the color conversion layer comprises a composite comprising a matrix and luminescent nanostructures dispersed in the matrix,
wherein a maximum peak emission wavelength of the luminescent nanostructures is greater than or equal about 600 nanomete

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Tae Gon
• Jun Shin Ae
• Chung Deukseok
• Park Garam
• Lee Sung Hun
• Choi Byoung Ki

Classifications

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• C09K11/883 Primary

  with zinc or cadmium · CPC title

• H10K2102/331

  Nanoparticles used in non-emissive layers, e.g. in packaging layer · CPC title

• H10K59/124

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K50/131

  with spacer layers between the electroluminescent layers · CPC title