Pixel structure and organic electroluminescent panel having the same

• US 20070035237A1
• Filed: 07/24/2006
• Published: 02/15/2007
• Est. Priority Date: 08/12/2005
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lee, Chung-Chun, Chang, Fan-Hsiu
• Application Number:
  US11/491,138
• Publication Number:
  US 20070035237A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A pixel structure for use in a white light emitting organic electroluminescent device therein comprises a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel. The first sub-pixel has a first color filter and a first color change medium. The second sub-pixel has a second color filter and a second color change medium. The third sub-pixel has only a third color filter. The fourth sub-pixel does not have any color filter or color change medium so that the white light emitted from the white light emitting organic electroluminescent device can pass through the fourth sub-pixel directly. Thereby, the white light can be transformed into the color corresponding to each color change medium. Besides, the color shown from the pixel structure can be modulated by the white light from the fourth sub-pixel.

Claims

1. A pixel structure for use in a white light organic electroluminescent device, comprising:

a first sub-pixel having a first color filter and a first color change medium;

a second sub-pixel having a second color filter and a second color change medium;

a third sub-pixel having a third color filter; and

a fourth sub-pixel, wherein the white light organic electroluminescent device emits white light passing through the first, second, third and fourth sub-pixels.

2. The pixel structure of claim 1, wherein the first color filter is a red light color filter, and the first color change medium is a red light color change medium.

3. The pixel structure of claim 1, wherein the second color filter is a green light color filter and the second color change medium is a green light color change medium.

4. The pixel structure of claim 1, wherein the third color filter is a blue color filter.

5. An organic electroluminescent device, comprising:

an array substrate;

a white light organic electroluminescent element disposed on the array substrate;

a filter substrate disposed upon the array substrate, one side of the filter substrate that faces the array substrate having a plurality filter areas, each of the filter areas comprising;

a first area having a first color filter and a first color change medium;

a second area having a second color filter and a second color change medium;

a third area having a third color filter; and

a fourth area, wherein the fourth area is transparent to the white light.

6. The organic electroluminescent device of claim 5, wherein the first color filter is sandwiched between the filter substrate and the first color change medium.

7. The organic electroluminescent device of claim 5, wherein the second color filter is sandwiched between the filter substrate and the second color change medium.

8. An organic electroluminescent device, comprising:

an array substrate;

a plurality filter areas formed on a surface of the array substrate, each of the filter areas comprising;

a first area having a first color filter and a first color change medium;

a second area having a second color filter and a second color change medium;

a third area having a third color filter; and

a fourth area having a transparent flat layer;

a white light organic electroluminescent element disposed upon the plurality of the filter areas, wherein the white light organic electroluminescent element emits light passing through the filter areas; and

a sealing top sealed with the array substrate.

9. The organic electroluminescent device of claim 8, wherein the first color filter is sandwiched between the array substrate and the first color change medium.

10. The organic electroluminescent device of claim 8, wherein the second color filter is sandwiched between the array substrate and the second color change medium.

11. An organic electroluminescent device, comprising:

an array substrate;

a white light organic electroluminescent element disposed on a surface of one side of the array substrate;

a plurality of filter areas formed on another side of the array substrate opposite to the white light organic electroluminescent element, each of the filter areas comprising;

a first area having a first color filter and a first color change medium,

a second area having a second color filter and a second color change medium,

a third area having a third color filter, and

a fourth area which is transparent for the white light to pass there through; and

a sealing top sealed with the array substrate.