ORGANIC LIGHT-EMITTING DISPLAY DEVICE

• US 20090242911A1
• Filed: 02/19/2009
• Published: 10/01/2009
• Est. Priority Date: 03/31/2008
• Status: Abandoned Application

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Shimizu, Masao, Ishihara, Shingo
• Application Number:
  US12/388,600
• Publication Number:
  US 20090242911A1
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/165 comprising dopants
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

An object of the present invention is to provide an organic light-emitting display device using a number of organic light-emitting elements that emit lights of different colors, wherein the life of the organic light-emitting elements that emits light of a color having a short life can be prolonged. According to the present invention, a hole injection layer 7, an α-NPD vapor deposited film 8, an n doped electron transportation layer 11 and a p doped hole transportation layer 12, which are patterned to the same size as B sub-pixels, a DNA vapor deposited film 13, an electron injection layer 14 and an upper electrode 15 are formed on a lower electrode 5 in a B sub-pixel. The α-NPD vapor deposited film 8 and the DNA vapor deposited film 13 function as a blue light-emitting layer and exhibit the same properties as when a blue light-emitting element made up of a lower electrode 5, a hole injection layer 7, an α-NPD vapor deposited film 8 and an n doped electron transportation layer 11 and a blue light-emitting element made up of a p doped hole transportation layer 12, a DNA vapor deposited film 13, an electron injection layer 14 and an upper electrode 15 are connected in series. Therefore, it becomes possible to lower the value of a current required for certain brightness, and thus, the life can be prolonged.

Claims

1. An organic light-emitting display device, comprising a multiple types of organic light-emitting elements whose types are divided by emission colors, characterized in that

at least a transportation layer for transporting holes and a transportation layer for transporting electrons are formed throughout the entirety of a display region,

a patterned charge generating layer is formed in the first type of organic light-emitting elements, and

a light-emitting layer is formed in the other types of organic light-emitting elements.

2. The organic light-emitting display device according to claim 1, characterized in that

a dopant for controlling the emission spectrum is added to at least one transportation layer of the above described transportation layers in the organic light-emitting elements having said charge generating layer.

3. The organic light-emitting display device according to claim 1, characterized in that

at least a patterned light-emitting layer is formed between said charge generating layer and said transportation layer.

4. The organic light-emitting display device according to claim 3, characterized in that

a patterned transportation layer is formed between said patterned light-emitting layer and said charge generating layer.

5. The organic light-emitting display device according to claim 1, characterized in that

the organic light-emitting elements having said charge generating layer emit blue light.

11. The organic light-emitting display device according to claim 1, characterized in that

said charge generating layer is formed of a multilayer film of an n doped electron transportation layer and a p doped hole transportation layer.

6. An organic light-emitting display device, comprising a multiple types of organic light-emitting elements whose types are divided by emission colors, characterized in that

at least a transportation layer for transporting holes and a transportation layer for transporting electrons are formed throughout the entirety of a display region,

a patterned charge generating layer is formed in both first and second types of organic light-emitting elements, and

a light-emitting layer is formed in other types of organic light-emitting elements.

7. The organic light-emitting display device according to claim 6, characterized in that

a dopant for controlling the emission spectrum is added to at least one transportation layer from among said transportation layers.

8. The organic light-emitting display device according to claim 6, characterized in that

a patterned light-emitting layer is formed in at least one type of organic light-emitting elements from among the two types of organic light-emitting elements having said charge generating layer.

9. The organic light-emitting display device according to claim 8, characterized in that

a patterned transportation layer is formed between said patterned light-emitting layer and said charge generating layer.

10. The organic light-emitting display device according to claim 6, characterized in that

the two types of organic light-emitting elements having said charge generating layer emit blue and green light.

12. An organic light-emitting display device, comprising a number of first organic light-emitting elements which emit light of at least one color and a number of second organic light-emitting elements which emit light of a color that is different from that of said first organic light-emitting elements, characterized in that

each organic light-emitting element has a pair of electrodes for applying a voltage to each element, and a hole transportation layer for transporting holes and an electron transportation layer for transporting electrons which are provided between said electrodes and run throughout the entirety of the display region,

said first organic light-emitting elements have a light-emitting layer between said hole transportation layer and said electron transportation layer separately from said second elements,

said second organic light-emitting elements have a charge generating layer which is provided between said hole transportation layer and said electron transportation layer separately from said first elements, and

at least either said hole transportation layer or said electron transportation layer is a layer for emitting light in said second organic light-emitting elements.

13. The organic light-emitting display device according to claim 12, characterized in that

said first organic light-emitting elements are organic light-emitting elements for emitting green light and organic light-emitting elements for emitting red light, and

said second organic light-emitting elements are organic light-emitting elements for emitting blue light.

14. The organic light-emitting display device according to claim 12, characterized in that

at least either said hole transportation layer or said electron transportation layer includes a dopant for providing light with the same color as that of light emitted by said second organic light-emitting elements.

15. The organic light-emitting display device according to claim 12, characterized in that

a hole injection layer is provided between said hole transportation layer and one electrode, and

an electron injection layer is provided between said electron transportation layer and the other electrode.

16. The organic light-emitting display device according to claim 12, characterized in that

said charge generating layer is a multilayer film of an n doped electron transportation layer provided so as to make contact with the hole transportation layer and a p doped hole transportation layer provided so as to make contact with the electron transportation layer.