ORGANIC ELECTROLUMINESCENT DEVICE

• US 20120049726A1
• Filed: 08/26/2011
• Published: 03/01/2012
• Est. Priority Date: 08/27/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Yoo, Juhn-Suk, Kim, Yong-Chul
• Granted Patent: US 8,716,929 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels

Abstract

An organic electroluminescent device including a first red sub-pixel region, a first green sub-pixel region and a deep blue sub-pixel region in a first pixel region; and a second red sub-pixel region, a second green sub-pixel region and a sky blue sub-pixel region in a second pixel region adjacent to the first pixel region, wherein each of the first and second red sub-pixel regions includes a first electrode, a red organic emission material pattern and a second electrode, each of the first and second green sub-pixel regions includes the first electrode, a green organic emission material pattern and the second electrode, wherein the deep blue sub-pixel region includes the first electrode, a deep blue organic emission material pattern and the second electrode, and the sky blue sub-pixel region includes the first electrode, a sky blue organic emission material pattern and the second electrode, and wherein an unit pixel displaying an image includes at least one of the deep blue sub-pixel region and the sky blue sub-pixel region with the second red sub-pixel region and the second green sub-pixel region.

Claims

1. An organic electroluminescent device, comprising:

a first red sub-pixel region, a first green sub-pixel region and a deep blue sub-pixel region in a first pixel region; and

a second red sub-pixel region, a second green sub-pixel region and a sky blue sub-pixel region in a second pixel region adjacent to the first pixel region,

wherein each of the first and second red sub-pixel regions includes a first electrode, a red organic emission material pattern and a second electrode, each of the first and second green sub-pixel regions includes the first electrode, a green organic emission material pattern and the second electrode, wherein the deep blue sub-pixel region includes the first electrode, a deep blue organic emission material pattern and the second electrode, and the sky blue sub-pixel region includes the first electrode, a sky blue organic emission material pattern and the second electrode, and wherein a unit pixel displaying an image includes at least one of the deep blue sub-pixel region and the sky blue sub-pixel region with the second red sub-pixel region and the second green sub-pixel region.

2. The device according to claim 1, wherein the first pixel region and the second pixel region are alternately arranged with each other.

3. The device according to claim 1, wherein each of the deep blue sub-pixel region and the sky blue sub-pixel region has an area lager than each of the red and green sub-pixel regions.

4. The device according to claim 1, wherein the first red sub-pixel region and the first green sub-pixel region are positioned at one side of the deep blue sub-pixel region, and the second red-sub-pixel region and the second green sub-pixel region are positioned at the other side of the deep blue sub-pixel region such that the second red-sub-pixel region and the second green sub-pixel region are positioned between the deep blue sub-pixel region and the sky blue sub-pixel region.

5. The device according to claim 4, wherein a first unit pixel using the first red sub-pixel region and the first green sub-pixel region and a second unit pixel using the second red sub-pixel region and the second green sub-pixel region share the deep blue sub-pixel region.

6. The device according to claim 1, wherein the second red sub-pixel region and the second green sub-pixel region are positioned at one side of the sky blue sub-pixel region and has the same distance with the sky blue sub-pixel region.

7. The device according to claim 6, wherein each of the second red sub-pixel region and the second green sub-pixel region has a trapezoidal shape.

8. The device according to claim 7, wherein a shorter side of the red sub-pixel region and a longer side of the green sub-pixel region face the sky blue sub-pixel region.

9. The device according claim 1, wherein the first red sub-pixel region and first green sub-pixel region are arranged along a horizontal direction and the deep blue sub-pixel region is arranged along a vertical direction with respect to the first red sub-pixel region and first green sub-pixel region.

10. The device according to claim 9, wherein the deep blue sub-pixel region has a diamond shape.

11. The device according to claim 1, wherein the deep blue organic emission material pattern includes a blue color host and a deep blue color dopant having an emission peak below about 460 nm.

12. The device according to claim 11, wherein the deep blue color dopant has a weight % of about 2 to about 10 with respect to a blue color host.

13. The device according to claim 1, wherein the sky blue organic emission material pattern includes a blue color host and a sky blue color dopant having an emission peak below about 470 nm.

14. The device according to claim 13, wherein the sky blue color dopant has a weight % of about 2 to about 10 with respect to a blue color host.

18. The device according to claim 9, wherein the deep blue sub-pixel region has a diamond shape.

15. An organic electroluminescent device, comprising:

a plurality of first pixel regions, each of the first pixel regions having a first red sub-pixel region, a first green sub-pixel region and a deep blue sub-pixel region, an area of the deep blue sub-pixel region being greater than an area of the first red sub-pixel region and an area of the first green sub-pixel region;

a plurality of second pixel regions, each of the second pixel regions a second red sub-pixel region, a second green sub-pixel region and a sky blue sub-pixel, an area of the sky blue sub-pixel region being greater than an area of the second red sub-pixel region and an area of the second green sub-pixel region;

the first pixel regions and the second pixel regions being arranged in a matrix wherein the first and second pixel regions are alternately disposed such that the first and second pixel regions are adjacent to each other;

a plurality of first pixel units, each first pixel unit displaying an image, wherein each first pixel unit includes a first red sub-pixel region, a first green sub-pixel region and a first portion of a deep blue sub-pixel region and a first portion of an adjacent sky blue sub-pixel region;

a plurality of second pixel units, each second pixel unit displaying an image, wherein each second pixel unit includes a second red sub-pixel region, a second green sub-pixel region and a second portion of the deep blue sub-pixel region and a second portion of the adjacent sky blue sub-pixel region.

16. The device according to claim 15, wherein each first and second red sub-pixel regions and each first and second green sub-pixel regions has a stripe shape.

17. The device according to claim 15, wherein each second red sub-pixel region and each second green sub-pixel region has a trapezoidal shape.