Flat panel light emitting devices with two sided

• US 20060006792A1
• Filed: 07/09/2004
• Published: 01/12/2006
• Est. Priority Date: 07/09/2004
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Strip, David R.
• Application Number:
  US10/888,763
• Publication Number:
  US 20060006792A1
• Time in Patent Office: Days
• US Class Current: 313/500
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/176 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths

Abstract

A flat panel light emitting device is descried comprised of a transparent substrate, a first organic light emitting diode element disposed over the substrate, a second organic light emitting diode element disposed over the first organic light emitting diode element, and a transparent cover disposed over the second organic light emitting element, wherein each of the first and second light emitting elements comprises an organic light emitting layer positioned between a transparent or semitransparent electrode and a reflective electrode, and wherein the first light emitting element emits light through its transparent or semitransparent electrode and the substrate and the second light emitting element emits light through its transparent or semitransparent electrode and the cover. The flat panel light emitting device is advantageous because it provides the capability to emit independently controlled patterns, colors, and intensities from the two sides of the flat panel.

Claims

1. A flat panel light emitting device comprised of a transparent substrate, a first organic light emitting diode element disposed over the substrate, a second organic light emitting diode element disposed over the first organic light emitting diode element, and a transparent cover disposed over the second organic light emitting element, wherein each of the first and second light emitting elements comprises an organic light emitting layer positioned between a transparent or semitransparent electrode and a reflective electrode, and wherein the first light emitting element emits light through its transparent or semitransparent electrode and the substrate and the second light emitting element emits light through its transparent or semitransparent electrode and the cover.

2. The flat light emitting device of claim 1 where the device is an area illumination light source.

3. The flat panel light emitting device of claim 2 where the device emits different colored light from each of the substrate and the cover.

4. The light source of claim 2 where each of the first and second light emitting elements are independently controllable.

5. The flat panel light emitting device of claim 1 where the device is a display.

6. The flat panel light emitting device of claim 5 where the device is a passive matrix display.

7. The flat panel light emitting device of claim 5 where the device is an active matrix display.

8. The flat panel light emitting device of claim 5 where each of the first and second light emitting elements are comprised of at least three distinct light emitting regions, wherein one region emits red, one region emits green, and one region emits blue light.

9. The flat panel light emitting device of claim 5 where each of the first and second light emitting elements are independently addressable.

10. The flat panel light emitting device of claim 1, further comprising an additional light emitting element positioned between the first light emitting element and the substrate or between the second light emitting element and the cover, where the additional light emitting element comprises an organic light emitting layer positioned between two transparent or semitransparent electrodes.

11. The flat panel light emitting device of claim 10 where the additional light emitting element is separated from the first or second light emitting element by an electrically insulating layer.

12. The flat panel light emitting device of claim 10 where the additional light emitting element is separated from the first or second light emitting element by an electrically conductive connecting layer.

13. The flat panel light emitting device of claim 1 where the first and second light emitting elements share a common reflective electrode layer.

14. The flat panel light emitting device of claim 1 where the reflective electrode of either of the first or second light emitting elements comprises a light reflective electrically conductive metal layer.

15. The flat panel light emitting device of claim 1 where the reflective electrode of either of the first or second light emitting elements comprises a transparent electrically conductive layer and an adjacent light reflective layer.

16. The flat panel light emitting device of claim 1 where the reflective electrodes of the first and second light emitting elements each comprise a light reflective electrically conductive metal layer, and wherein the reflective electrodes are separated by an electrically insulating layer.