Multicolor electroluminescent display

• US 20050242712A1
• Filed: 04/29/2004
• Published: 11/03/2005
• Est. Priority Date: 04/29/2004
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Sung, Chao-Chin
• Application Number:
  US10/834,530
• Publication Number:
  US 20050242712A1
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

In an organic electroluminescent display, a pixel includes a plurality of color light-emitting units that are arranged in multi-layer stacks of specific color emissions. The color light-emitting units include layers made of organic electroluminescent materials. The stacks of different color emissions include different numbers of color light-emitting units to compensate the degradation of specific color emissions.

Claims

1. A multicolor electroluminescent display, comprising:

a pixel area defined on a substrate; and

a plurality of color light-emitting units including electroluminescent materials configured to irradiate color lights, the color light-emitting units being arranged in multi-layer stacks of specific color emissions in the pixel area of the substrate;

wherein at least two stacks of two color emissions include different numbers of color light-emitting units.

2. The multicolor electroluminescent display according to claim 1, wherein the color light-emitting units are configured to emit red, green and blue colors.

3. The multicolor electroluminescent display according to claim 2, wherein the number of stacked blue light-emitting units is greater than the number of stacked green light-emitting units.

4. The multicolor electroluminescent display according to claim 2, wherein the number of stacked green light-emitting units is greater than the number of stacked red light-emitting units.

5. The multicolor electroluminescent display according to claim 1, wherein the number of color light-emitting units in a first stack is greater than the number of color light-emitting units in a second stack if the specific color emission of one color light-emitting unit degrades faster in the first stack than in the second stack.

6. The multicolor electroluminescent display according to claim 1, wherein one stack of a specific color emission includes color light-emitting units alternated with one or more charge generation layer between a top electrode and a bottom electrode.

7. The multicolor electroluminescent display according to claim 6, wherein one of the top or bottom electrode is made of a transparent conductive material, while the other of the top or bottom electrode is made of a conductive metallic material.

8. The multicolor electroluminescent display according to claim 1, wherein at least two multi-layer stacks of two specific color emissions occupy surface areas of different size on the substrate.

9. The multicolor electroluminescent display according to claim 8, wherein the area occupied by a first stack on the substrate is greater than the area occupied by a second stack on the substrate if the specific color emission of one color light-emitting unit degrades faster in the first stack than in the second stack.

10. The multicolor electroluminescent display according to claim 1, wherein the substrate is made of a transparent material including sapphire, glass, SiC or the like.

11. The multicolor electroluminescent display according to claim 1, wherein the color light-emitting units include layers made of an organic electroluminescent material.

12. A multicolor electroluminescent display, comprising:

a pixel area defined on a substrate; and

a plurality of color light-emitting units respectively including electroluminescent materials configured to irradiate color lights, the color light-emitting units being arranged in multi-layer stacks of specific color emissions in the pixel area of the substrate;

wherein the respective sizes of at least two stacks of two specific color emissions differ from each other so as to compensate a difference in the degradation of color emission in the two stacks.

13. The multicolor electroluminescent display according to claim 12, wherein at least two stacks of two specific color emissions include different numbers of color light-emitting units.

14. The multicolor electroluminescent display according to claim 12, wherein at least two multi-layer stacks of two specific color emissions occupy surface areas of different size on the substrate.

15. The multicolor electroluminescent display according to claim 12, wherein the size of a first stack of color light-emitting units is greater than the size of a second stack of color light-emitting units if the color emission of one color light-emitting unit degrades faster in the first stack than in the second stack.

16. The multicolor electroluminescent display according to claim 12, wherein the color light-emitting units are configured to emit red, green and blue color.

17. The multicolor electroluminescent display according to claim 12, wherein one stack of a specific color emission includes color light-emitting units alternated with one or more charge generation layer between a top electrode and a bottom electrode.

18. The multicolor electroluminescent display according to claim 17, wherein one of the top or bottom electrode is made of a transparent conductive material, while the other of the top or bottom electrode is made of a conductive metallic material.

19. The multicolor electroluminescent display according to claim 12, wherein the substrate is made of a transparent material including sapphire, glass, SiC or the like.