Full-color organic electroluminescence pixel devices and display panel composed of the same device

• US 20060033426A1
• Filed: 11/15/2004
• Published: 02/16/2006
• Est. Priority Date: 08/10/2004
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute, WORLDLED CO., LTD.
• Original Assignee: Industrial Technology Research Institute, WORLDLED CO., LTD.
• Inventors: Chao, Ching-Ian, Yen, Chia-Kuo, Lu, Chun-Te, Chang, En-Chung
• Application Number:
  US10/986,795
• Publication Number:
  US 20060033426A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

A full-color organic electroluminescence (OEL) pixel device and a display panel composed of the OEL pixel device are disclosed. The full-color OEL pixel device is formed by a combination of OEL sub-pixel elements of three types corresponding to R, G and B. The full-color organic OEL pixel device comprises a common electrode, first sub-pixel organic material layers arranged at a surface of mentioned common electrode, a first electrode arranged to sandwich mentioned first sub-pixel organic material layers with mentioned common electrode, second and third sub-pixel organic material layers arranged in parallel at another surface of mentioned common electrode, a second electrode arranged to sandwich mentioned second sub-pixel organic material layers with mentioned common electrode, and a third electrode arranged to sandwich mentioned third sub-pixel organic material layers with mentioned common electrode. An inventive full-color OEL display panel will feature high aperture ratio, high pixel density and low reflection.

Claims

1. A full-color organic electroluminescence (OEL) pixel device, comprises:

a common electrode;

a plurality of first sub-pixel organic material layers arranged at a surface of said common electrode;

a first electrode arranged to sandwich said first sub-pixel organic material layers with said common electrode

a plurality of second sub-pixel organic material layers and a plurality of third sub-pixel organic material layers arranged in parallel at another surface of said common electrode;

a second electrode arranged to sandwich said second sub-pixel organic material layers with said common electrode; and

a third electrode arranged to sandwich said third sub-pixel organic material layers with said common electrode.

2. The full-color OEL pixel device of claim 1, wherein said common electrode is a semi-transparent electrode.

3. The full-color OEL pixel device of claim 1, wherein said common electrode is made of a material selected from a group consisting of a metal, a metal alloy and a metal oxide.

4. The full-color OEL pixel device of claim 1, further comprising a transparent substrate bearing said first electrode thereon.

5. The full-color OEL pixel device of claim 1, further comprising a transparent substrate bearing said second and third electrodes thereon.

6. The full-color OEL pixel device of claim 1, wherein said first electrode is high optically reflective while each of said second and third electrodes is optically transparent.

7. The full-color OEL pixel device of claim 6, wherein said first electrode is a metal electrode while each of said second and third electrodes is a transparent electrode.

8. The full-color OEL pixel device of claim 1, wherein said first electrode is optically transparent while each of said second and third electrodes is high optically reflective.

9. The full-color OEL pixel device of claim 8, wherein said first electrode is a transparent electrode while each of said second and third electrodes is a metal electrode.

10. The full-color OEL pixel device of claim 1, wherein said first sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

11. The full-color OEL pixel device of claim 1, wherein said second sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

12. The full-color OEL pixel device of claim 1, wherein said third sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

13. The full-color OEL pixel device of claim 1, wherein said first, second and third sub-pixel organic material layers generate a red light, a green light and a blue light, respectively.

14. A full-color organic electroluminescence (OEL) display panel, comprising:

a plurality of full-color OEL pixel devices arranged in a matrix and corresponding to a plurality of pixels as a display screen, each of said plurality full-color OEL pixel devices, comprising;

a common electrode;

a plurality of first sub-pixel organic material layers arranged at a surface of said common electrode;

a first electrode arranged to sandwich said first sub-pixel organic material layers with said common electrode

a plurality of second sub-pixel organic material layers and a plurality of third sub-pixel organic material layers arranged in parallel at another surface of said common electrode;

a second electrode arranged to sandwich said second sub-pixel organic material layers with said common electrode; and

a third electrode arranged to sandwich said third sub-pixel organic material layers with said common electrode.

15. The full-OEL display panel of claim 14, the second sub-pixel organic layers in the full-color OEL pixel device abuts the second sub-pixel organic layers in its adjacent the full-color OEL pixel device, the third sub-pixel organic layers in the full-color OEL pixel device abuts the third sub-pixel organic layers in its adjacent the full-color OEL pixel device.

16. The full-OEL display panel of claim 14, the second sub-pixel organic layers in the full-color OEL pixel device abuts the third sub-pixel organic layers in its adjacent the full-color OEL pixel device, the third sub-pixel organic layers in the full-color OEL pixel device abuts the second sub-pixel organic layers in its adjacent the full-color OEL pixel device.

17. The full-color OEL display panel of claim 14, wherein said common electrode is a semi-transparent electrode.

18. The full-color OEL display panel of claim 14, wherein said common electrode is selected from a group consisting of a metal, a metal alloy and a metal oxide.

19. The full-color OEL display panel of claim 14, wherein said first electrode is high optically reflective while each of said second and third electrodes is optically transparent.

20. The full-color OEL display panel of claim 19, wherein said first electrode is a metal electrode while each of said second and third electrode is a transparent electrode.

21. The full-color OEL display panel of claim 14, wherein said first electrode is a optically transparent while each of said second and third electrodes is high optically reflective.

22. The full-color OEL display panel of claim 21, wherein said first electrode is a transparent electrode while each of said second and third electrodes is a metal electrode.

23. The full-color OEL display panel of claim 14, wherein said first sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

24. The full-color OEL display panel of claim 14, wherein said second sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

25. The full-color OEL display panel of claim 14, wherein said third sub-pixel organic material layers include a suitable combination of elements selected from the group consisting of a hole-injection layer, a hole-transport layer, a light-emission layer, an electron-transport layer and an electron-injection layer.

26. The full-color OEL display panel of claim 14, wherein said first, second and third sub-pixel organic material layers generate a red light, a green light and a blue light, respectively.