ORGANIC LIGHT EMITTING DISPLAY DEVICE

• US 20170373277A1
• Filed: 10/12/2016
• Published: 12/28/2017
• Est. Priority Date: 06/28/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: NOH, Seonghee, LIM, YoungNam, LEE, SangHo, RYU, DaeWon
• Granted Patent: US 10,644,265 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/8051 Anodes
• CPC Class Codes: H10K 59/8052 Cathodes
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

An organic light emitting display device has an optical multilayer film on an organic light emitting diode. The organic light emitting display device includes an organic light emitting element with a cathode, an anode, and an organic light emitting layer, and an optical multilayer film on the organic light emitting element. The optical multilayer film is constructed such that a full width at half maximum of light emitted from the organic light emitting element is larger than a full width at half maximum of light emitted from a structure in which the optical multilayer film is not used. The color shift depending on a viewing angle of the organic light emitting display device may be reduced to improve efficiency of the organic light emitting element.

Claims

1. An organic light emitting display device, comprising:

an organic light emitting element including a cathode, an anode, and an organic light emitting layer; and

an optical multilayer film on the organic light emitting element,

wherein the optical multilayer film is constructed such that a full width at half maximum of light emitted from the organic light emitting element is larger than a full width at half maximum of light emitted from a structure in which the optical multilayer film is not used.

2. The organic light emitting display device according to claim 1, further comprising:

a passivation layer on the optical multilayer film.

3. The organic light emitting display device according to claim 2, further comprising:

an organic layer between the optical multilayer film and the passivation layer.

4. The organic light emitting display device according to claim 2, wherein the optical multilayer film includes three optical layers having different refractive indexes.

5. The organic light emitting display device according to claim 4, wherein the three optical layers are deposited as a first optical layer, a second optical layer, and a third optical layer in order on the cathode and a refractive index of the second optical layer is smaller than those of the first optical layer and the third optical layer.

6. The organic light emitting display device according to claim 1, wherein the optical multilayer film includes four optical layers and refractive indexes of odd-numbered deposited optical layers from the cathode among the four optical layers are larger than those of even-numbered deposited optical layers.

7. The organic light emitting display device according to claim 6, wherein a thickness of the last deposited optical layer among the four optical layers is between 100 nm and 5000 nm.

8. The organic light emitting display device according to claim 1, further comprising:

an insulating layer on the organic light emitting element, and

wherein a thickness of the insulating layer is less than 5 nm.

9. The organic light emitting display device according to claim 1, wherein the optical multilayer film includes a plurality of optical layers and an optical layer having a relatively small refractive index among the plurality of optical layers is formed of silicon oxynitride (SiON).

10. The organic light emitting display device according to claim 1, further comprising:

an atomic deposition layer above or below the optical multilayer film.

11. An organic light emitting display device, comprising:

an organic light emitting element including a cathode, an anode, and an organic light emitting layer; and

an optical multilayer film including a plurality of optical layers on the organic light emitting element,

wherein the optical multilayer film is configured to cause a weak microcavity effect.

12. The organic light emitting display device according to claim 11, wherein the optical multilayer film includes a pair of optical layers in which an optical layer having a relatively larger refractive index and an optical layer having a relatively smaller refractive index are sequentially disposed.

13. The organic light emitting display device according to claim 12, wherein the optical multilayer film further includes another pair of optical layers in which an optical layer having a relatively larger refractive index and an optical layer having a relatively smaller refractive index are sequentially disposed.

14. The organic light emitting display device according to claim 12, wherein a difference of the refractive indexes of the optical layer having a relatively larger refractive index and the optical layer having a relatively smaller refractive index is between 0.01 and 0.6.

15. The organic light emitting display device according to claim 11, further comprising:

a functional layer on the organic light emitting layer and configured to reduce separation due to a difference of expansion coefficients of the optical multilayer film and the organic light emitting layer.

16. The organic light emitting display device according to claim 11, further comprising:

an atomic deposition layer which is contact with an upper portion or a lower portion of the optical multilayer film.

17. An organic light emitting display device, comprising:

an organic light emitting element including a cathode; and

an optical multilayer film in which a first optical layer and a second optical layer are sequentially deposited on the organic light emitting device,

wherein a refractive index of the first optical layer is larger than a refractive index of the second optical layer.

18. The organic light emitting display device according to claim 17, wherein the refractive index of the first optical layer is larger than a refractive index of the cathode.

19. The organic light emitting display device according to claim 18, wherein the optical multilayer film further includes a third optical layer and the refractive index of the second optical layer is smaller than a refractive index of the third optical layer.

20. The organic light emitting display device according to claim 19, wherein the optical multilayer film further includes a fourth optical layer and the refractive index of the third optical layer is larger than a refractive index of the fourth optical layer.