Organic light emitting device, method of manufacturing the same, and shadow mask therefor

Patent metadata

Field	Value
Publication number	US-10847583-B2
Application number	US-201615071816-A
Country	US
Kind code	B2
Filing date	Mar 16, 2016
Priority date	Jun 27, 2008
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

An organic light emitting device including a blue subpixel that is larger than a red subpixel and a green subpixel. The red subpixel and the green subpixel have the same layered structure such that the red subpixel and the green subpixel are formed by using the same shadow mask.

First claim

What is claimed is:

1. An organic light emitting device, comprising:
a first pixel comprising a first red subpixel, a first green subpixel, and a first blue subpixel, and
a second pixel comprising a second red subpixel, a second green subpixel, and a second blue subpixel,
wherein the first pixel and the second pixel are adjacent to each other in a column direction,
wherein the first green subpixel and the second blue subpixel are adjacent to each other in the column direction,
wherein the first blue subpixel and the second red subpixel are adjacent to each other in the column direction,
wherein the first and second red subpixels have substantially the same size and comprise a pixel electrode, a common electrode, and a red organic light emitting member, respectively,
wherein the first and second green subpixels have substantially the same size and comprise a pixel electrode, a common electrode, and a green organic light emitting member, respectively,
wherein the first and second blue subpixels have substantially the same size and comprise a pixel electrode, a common electrode, and a blue organic light emitting member, respectively,
wherein each of the first and second blue subpixels is continuous and undivided;
wherein the first red subpixel and the first green subpixel have substantially the same size,
wherein the first blue subpixel has substantially the same width as the first red subpixel and the first green subpixel,
wherein an area of the first blue subpixel is larger than a sum of an area of the first red subpixel and an area of the first green subpixel,
wherein the red organic light emitting member and the green organic light emitting member each have a different thickness from the blue organic light emitting member,
wherein the red organic light emitting member and the green organic light emitting member have substantially a same thickness, and
wherein the pixel electrode of the first red subpixel has a different thickness from the pixel electrode of the first green subpixel.

2. The organic light emitting device of claim 1 , wherein the first and second red subpixels, the first and second green subpixels, and the first and second blue subpixels further comprise a reflecting electrode arranged under the pixel electrode, and
an interval between the reflecting electrode and the common electrode in the first and second red subpixels is different from the interval between the reflecting electrode and the common electrode in the first and second green subpixels.

3. The organic light emitting device of claim 2 , wherein:
the interval between the reflecting electrode and the common electrode in the first and second red subpixels is equivalent to a total thickness of the pixel electrode of the first and second red subpixels and the red organic light emitting member; and
the interval between the reflecting electrode and the common electrode in the first and second green subpixels is equivalent to a total thickness of the pixel electrode of the first and second green subpixel and the green organic light emitting member.

4. The organic light emitting device of claim 2 , wherein the common electrode is a translucent electrode.

5. The organic light emitting device of claim 4 , wherein the interval between the reflecting electrode and the common electrode is an integer multiple of the wavelength of the corresponding color of the corresponding subpixel.

6. The organic light emitting device of claim 4 , wherein:
the reflecting electrode and the translucent electrode in each subpixel comprise a metal of magnesium, aluminum, silver, or an alloy thereof; and
the translucent electrode is thinner than the reflecting electrode.

7. The organic light emitting device of claim 1 , wherein the blue organic light emitting member comprises a hole injection layer, a hole transport layer, a blue emission layer, an electron transport layer, and an electron injection layer that are sequentially disposed.

8. The organic light emitting device of claim 1 , wherein the red organic light emitting member and the green organic light emitting member have substantially a same thickness as each other.

9. The organic light emitting device of claim 1 , wherein the common electrode in each subpixel comprises aluminum.

10. The organic light emitting device of claim 1 , wherein the pixel electrode of the first blue subpixel has substantially a same thickness as one of the pixel electrodes of the first red subpixel and the first green subpixel.

11. An organic light emitting device comprising:
a red subpixel comprising a pixel electrode, a common electrode, and a red organic light emitting member;
a green subpixel comprising a pixel electrode, a common electrode, and a green organic light emitting member; and
a blue subpixel comprising a pixel electrode, a common electrode, and a blue organic light emitting member, the blue subpixel having a larger size than the red subpixel, and the blue subpixel having a larger size than the green subpixel,
wherein:
one red subpixel, one green subpixel, and one blue subpixel form a unit pixel;
the blue subpixel is continuous and undivided;
the red subpixel and the green subpixel have substantially the same size;
the blue subpixel has substantially the same width as the red subpixel and the green subpixel;
an area of the blue subpixel is larger than a sum of an area of the red subpixel and an area of the green subpixel;
a first unit pixel comprises the red subpixel and the green subpixel, which are alternately arranged according to a first column, and the blue subpixel, which is arranged according to a second column;
a second unit pixel that is symmetrical in left and right directions; and
the red organic light emitting member and the green organic light emitting member each have a different thickness from the blue organic light emitting member,
wherein the red organic light emitting member and the green organic light emitting member have substantially a same thickness, and
wherein the pixel electrode of the red subpixel has a different thickness from the pixel electrode of the green subpixel.

12. The organic light emitting device of claim 11 , wherein the red organic light emitting member and the green organic light emitting member have substantially a same thickness as each other.

13. The organic light emitting device of claim 11 , wherein the common electrode in each subpixel comprises aluminum.

14. The organic light emitting device of claim 11 , wherein the pixel electrode of the blue subpixel has substantially a same thickness as one of the pixel electrodes of the red subpixel and the green subpixel.

Assignees

• Samsung Display Co Ltd

Inventors

• Sung Un-Cheol
• Choi Beohm-Rock

Classifications

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• H10K59/805

  Electrodes · CPC title

• H10K59/173

  comprising banks or shadow masks · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K2102/351

  Thickness · CPC title