Emissive display using organic light emitting diodes

• US 5,920,080 A
• Filed: 05/08/1998
• Issued: 07/06/1999
• Est. Priority Date: 06/23/1997
• Status: Expired due to Term

• Current Assignee: eMagin Corporation (Samsung Electronics Co. Ltd.)
• Original Assignee: Fed Corp. (Samsung Electronics Co. Ltd.)
• Inventors: Jones, Gary W.
• Primary Examiner(s): Tran, Minh Loan
• Application Number:
  US09/074,424
• Time in Patent Office: 424 Days
• Field of Search: 257/40, 257/98, 257/99, 257/103, 313/509, 313/500, 313/503, 313/506
• US Class Current: 257/40
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

An organic light emitting device ("OLED") for a color video display. The OLED is a layered structure formed on a substrate. A layer of light emitting organic material is sandwiched between two conductive layers and placed on the substrate. Overlying the conductors and organic layer is a transparent cover layer. The OLED of the present invention includes an innovative microcavity enhancing structure, which restricts light emission in directions parallel to the substrate and provides increased light output toward the viewer.

Claims

1. An organic light emitting device comprising:

a substrate;

a first conductor overlying said planar substrate;

a layer of light emitting organic material overlying said first conductor;

a second conductor overlying said layer of light emitting material; and

a means for restricting light emission in directions parallel to said substrate.

2. The device according to claim 1, wherein said substrate comprises a silicon wafer.

3. The device according to claim 2, further comprising a means for connecting said silicon wafer to said first conductor.

4. The device according to claim 1, wherein said first conductor is planarized.

5. The device according to claim 1, wherein said means for restricting light emission comprises a layer of dielectric material.

6. The device according to claim 1, wherein said means for restricting light emission comprises a plurality of layers of dielectric material.

7. The device according to claim 6, wherein each of said plurality of layers of dielectric material has a different index of refraction from that of any adjacent layer.

8. The device according to claim 6, wherein at least one of said plurality of layers of dielectric is deposited at an angle to said substrate.

9. The device according to claim 6, wherein at least one of said plurality of of layers of dielectric material is evaporated at an angle to said substrate.

10. The device according to claim 6, wherein said substrate is rotating when at least one of said plurality of layers of dielectric material is constructed.

11. The device according to claim 1, wherein said means for restricting light emission comprises a layer of transparent conductor material.

12. The device according to claim 1, wherein said means for restricting light emission comprises a plurality of layers of transparent conductor material overlying said first conductor and underlying said light emitting organic material.

13. The device according to claim 1, wherein said means for restricting light emission overlies said layer of light emitting organic material.

14. The device according to claim 1, further comprising a transition layer underlying said first conductor.

15. The device according to claim 1, further comprising a barrier layer overlying said second conductor.

16. The device according to claim 15, wherein said barrier layer comprises diamond-like carbon material.

17. The device according to claim 15, wherein said barrier layer is an electron injector.

18. The device according to claim 15, further comprising a getter layer overlying said second conductor and underlying said barrier layer.

19. The device according to claim 15, further comprising a sealing layer overlying said barrier layer.

20. The device according to claim 19, wherein said sealing layer comprises a heat adhesive seal.

21. The device according to claim 15, further comprising a top cover overlying said barrier layer.

22. The device according to claim 1, further comprising a getter layer overlying said layer of light emitting organic material and underlying said second conductor.

23. The device according to claim 1, wherein said substrate is planar.

24. An organic light emitting device comprising:

a planar substrate, comprising a silicon wafer and a conducting plug, wherein said silicon wafer further comprises integrated circuitry, and said conducting plug connects the integrated circuitry to a conductor pad, wherein said conductor pad overlies said planar substrate;

a layer of light emitting organic material overlying said conductive pad;

a layer of getter material capable of reacting with water overlying said layer of light emitting organic material;

a transparent conductor layer overlying said getter layer;

a plurality of layers of dielectric material, wherein each of said plurality of layers of dielectric material has a different index of refraction from any adjacent layer;

a barrier layer overlying said layers of dielectric material;

wherein said barrier layer is formed from diamond-like carbon; and

a transparent top cover overlying said barrier layer.