OPTICAL MODIFIER AND DISPLAY DEVICE INCLUDING THE SAME

• US 20200136074A1
• Filed: 09/09/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Hongbeom, LEE, Young-hoon, LIM, Taewoo, JUNG, Hongkee, KIM, Dongwoo, KIM, Wontae, MAENG, Cheonjae, PARK, Keunwoo, LEE, Seongyeon, KIM, Minsu, SON, Dongil
• Granted Patent: US 10,950,813 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/18 Carrier blocking layers
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
• CPC Class Codes: H10K 85/40 Organosilicon compounds, e.g. TIPS pentacene

Abstract

An optical modifier may include a color controller including quantum dots, a barrier layer encapsulating the color controller, and a low refractive layer spaced apart from the color controller with the barrier layer interposed between the color controller and the barrier layer. The barrier layer may have a layer density ranging from 1.50 g/cm3 to 3.0 g/cm3.

Claims

1. An optical modifier, comprising:

a color controller including quantum dots;

a barrier layer encapsulating the color controller; and

a low refractive layer spaced apart from the color controller with the barrier layer interposed between the color controller and the barrier layer,

wherein the barrier layer has a layer density ranging from 1.50 g/cm3 to 3.0 g/cm3.

2. The optical modifier of claim 1, wherein the barrier layer comprises silicon nitride (SiN_X).

3. The optical modifier of claim 2, wherein a content ratio of nitrogen (N) to silicon (Si) in the barrier layer ranges from 0.70 to 1.50.

4. The optical modifier of claim 2, wherein a remaining stress of the barrier layer ranges from −

300 MPa to 500 MPa.

5. The optical modifier of claim 1, wherein the barrier layer comprises silicon oxide (SiO_X).

6. The optical modifier of claim 5, wherein a remaining stress of the barrier layer ranges from −

500 MPa to 500 MPa.

7. The optical modifier of claim 1, wherein the barrier layer comprises:

a first inorganic layer covering a rear surface of the color controller; and

a second inorganic layer covering a top surface of the color controller.

8. The optical modifier of claim 7, wherein each of the first and second inorganic layers is composed of a single layer.

9. The optical modifier of claim 8, wherein the barrier layer comprises silicon nitride (SiN_X),

a thickness of the first inorganic layer is larger than or equal to 0.1 μ

m, and

a thickness of the second inorganic layer is larger than or equal to 0.3 μ

m.

10. The optical modifier of claim 8, wherein the barrier layer comprises silicon oxide (SiO_X),

a thickness of the first inorganic layer is larger than or equal to 0.3 μ

m, and

a thickness of the second inorganic layer is larger than or equal to 0.3 μ

m.

11. The optical modifier of claim 7, wherein at least one of the first and second inorganic layers comprises:

a first layer containing silicon nitride (SiN_X); and

a second layer, which is stacked on the first layer and contains silicon oxide (SiO_X).

12. The optical modifier of claim 11, wherein each of the first layer and the second layer is provided in plural, and

the first and second layers are disposed in an alternate manner.

13. A display device, comprising:

a base substrate;

a plurality of pixels disposed on the base substrate;

a color controller disposed on or below the pixels, the color controller including quantum dots;

a barrier layer encapsulating the color controller; and

a low refractive layer spaced apart from the color controller with the barrier layer interposed between the color controller and the barrier layer,

wherein the barrier layer has a layer density ranging from 1.50 g/cm3 to 3.0 g/cm3.

14. The display device of claim 13, wherein the barrier layer comprises:

a first inorganic layer covering a rear surface of the color controller; and

a second inorganic layer covering a top surface of the color controller.

15. The display device of claim 14, wherein the barrier layer comprises silicon nitride (SiN_X), and

a content ratio of nitrogen (N) to silicon (Si) in the barrier layer ranges from 0.70 to 1.50.

16. The display device of claim 15, wherein a thickness of the first inorganic layer is larger than or equal to 0.1 μ

m, and

a thickness of the second inorganic layer is larger than or equal to 0.3 μ

m.

17. The display device of claim 14, wherein the barrier layer comprises silicon oxide (SiO_X),

a thickness of the first inorganic layer is larger than or equal to 0.3 μ

m, and

a thickness of the second inorganic layer is larger than or equal to 0.3 μ

m.

18. The display device of claim 13, wherein each of the pixels comprises:

a transistor disposed on the base substrate;

a first electrode connected to the transistor;

a second electrode facing the first electrode; and

a liquid crystal layer disposed between the first electrode and the second electrode.

19. The display device of claim 18, further comprising:

a light source disposed below the base substrate to provide light; and

a light guide plate including an emission surface facing the base substrate, a bottom surface opposite to the emission surface, an incidence surface facing the light source and connecting the bottom surface to the emission surface, and an opposite surface opposite to the incidence surface,

wherein the light is a blue light.

20. The display device of claim 19, further comprising a first polarization layer and a second polarization layer, which are spaced apart from each other with the pixel interposed therebetween.

21. The display device of claim 19, wherein the color controller comprises sub-color controllers, each of which converts the light to light of different color.

22. The display device of claim 21, further comprising a light-blocking portion including a plurality of openings and a light filter layer overlapped with at least one of the openings,

wherein at least one of the sub-color controllers is disposed to be overlapped with the light filter layer.

23. The display device of claim 13, wherein each of the pixels comprises:

a transistor provided on the base substrate; and

an organic light emitting device comprising a first electrode connected to the transistor, a second electrode spaced apart from the first electrode, and an organic layer disposed between the first electrode and the second electrode.

24. The display device of claim 23, wherein the color controller comprises sub-color controllers converting light, which is provided from the pixels, to light of different color.

25. The display device of claim 24, wherein the organic layer is disposed on an entire surface of the base substrate to provide a blue light to the color controller.

26. The display device of claim 23, wherein the organic layer comprises a plurality of patterns providing lights of different colors, and

each of the patterns is overlapped with a corresponding one of the sub-color controllers.