Organic light emitting display apparatus

• US 10,236,463 B2
• Filed: 04/20/2018
• Issued: 03/19/2019
• Est. Priority Date: 10/24/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Chi-O, Yang, Byungchoon, Seo, Young-Jun, Park, Won Sang
• Primary Examiner(s): Soward, Ida M
• Application Number:
  US15/958,726
• Publication Number:
  US 20180240992A1
• Time in Patent Office: 333 Days
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/101 comprising transparent conductive oxides [TCO]
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/814 combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/1216 : the pixel elements being capacitors
• CPC Class Codes: H10K 59/122 : Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/35 : comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 : comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 77/111 : Flexible substrates

Abstract

An organic light emitting display apparatus including a substrate including a plurality of pixel areas; a pixel electrode on the substrate; an opposite electrode on the pixel electrode, the opposite electrode transmitting light; an organic light emitting layer between the pixel electrode and the opposite electrode, the organic light emitting layer emitting a first light toward the opposite electrode; a light emitting layer on the opposite electrode, the light emitting layer absorbing a portion of the first light and emitting a second light; and a sealing layer on the light emitting layer, the sealing layer sealing the pixel electrode, the opposite electrode, the organic light emitting layer, and the light emitting layer.

Claims

1. A display apparatus, comprising:

a substrate including a plurality of pixel areas;

a pixel electrode on the substrate;

an opposite electrode on the pixel electrode;

a main light emitting layer between the pixel electrode and the opposite electrode, the main light emitting layer emitting a first light; and

a sub light emitting layer on the substrate, wherein the sub light emitting layer absorbs a portion of the first light and emits a second light.

2. The display apparatus as claimed in claim 1, wherein the sub light emitting layer includes at least one of an organic light emitting material, a phosphor, or a quantum dot.

3. The display apparatus as claimed in claim 2, wherein the sub light emitting layer includes the quantum dot, the quantum dot including at least one of a CdSe core/ZnS shell, a CdSe core/CdS shell, or an InP core/ZnS shell.

4. The display apparatus as claimed in claim 1, wherein:

the pixel areas include a red pixel area, a green pixel area, and a blue pixel area,

the main light emitting layer includes a first organic light emitting layer in the red pixel area, a second organic light emitting layer in the green pixel area, and a third organic light emitting layer in the blue pixel area, and

the sub light emitting layer includes a first light emitting layer in the red pixel area, a second light emitting layer in the green pixel area, and a third light emitting layer in the blue pixel area.

5. The display apparatus as claimed in claim 4, wherein:

the first organic light emitting layer includes a material that emits light having a red color,

the second organic light emitting layer includes a material that emits light having a green color, and

the third organic light emitting layer includes a material that emits light having a blue color.

6. The display apparatus as claimed in claim 4, wherein:

the first, second, and third organic light emitting layers include a material emitting a blue color.

7. The display apparatus as claimed in claim 6, wherein:

a light emitted from the first organic light emitting layer and passing through the first light emitting layer has a red color,

a light emitted from the second organic light emitting layer and passing through the second light emitting layer has a green color, and

a light emitted from the third organic light emitting layer and passing through the third light emitting layer has a blue color.

8. The display apparatus as claimed in claim 4, wherein the second light has no directivity.

9. The display apparatus as claimed in claim 4, wherein:

the first light includes;

a first incident light that is incident on the sub light emitting layer in a direction that is perpendicular to an interface between the main light emitting layer and the sub light emitting layer, and

a second incident light that is incident on the sub light emitting layer in a direction that is inclined with respect to the interface, and

the second light includes;

a first output light that is emitted in response to the first incident light, and

a second output light that is emitted in response to the second incident light.

10. The display apparatus as claimed in claim 9, wherein:

the first output light has a wavelength band that is red shifted when compared to the first incident light, and

the second output light has a wavelength band that is red shifted when compared to the second incident light.

11. The display apparatus as claimed in claim 9, wherein a difference in a wavelength band between the second incident light and the second output light is greater than a difference in a wavelength band between the first incident light and the first output light.

12. The display apparatus as claimed in claim 9, wherein a difference in a peak wavelength between the second incident light and the second output light is greater than a difference in a peak wavelength between the first incident light and the first output light.

13. The display apparatus as claimed in claim 9, wherein a difference in a peak wavelength between a front light constituting a portion of the second light that is obtained from the first incident light and an inclined light constituting a remaining portion of the second light that is obtained from the second incident light is smaller than a difference in peak wavelength between the first incident light and the second incident light.

14. The display apparatus as claimed in claim 1, wherein the sub light emitting layer is disposed on the opposing electrode.