ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20090128458A1
• Filed: 08/27/2008
• Published: 05/21/2009
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Hyo-Seok, Park, Kyong-Tae
• Granted Patent: US 9,013,381 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• 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 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

Disclosed is an organic light emitting device which includes a first pixel displaying red, a second pixel displaying green, a third pixel displaying blue, and a fourth pixel displaying blue and forming a dot along with the first pixel, the second pixel, and the third pixel. The first to fourth pixels include a switching element and an organic light emitting element connected to the switching element, and the sum of the areas of the first to fourth pixels is substantially the same as the area of the dot.

Claims

1. An organic light emitting device comprising:

a first pixel displaying red;

a second pixel displaying green;

a third pixel displaying blue; and

a fourth pixel displaying blue, and forming a dot along with the first pixel, the second pixel, and the third pixel a dot,

wherein the first to fourth pixels respectively comprise a switching element and an organic light emitting element connected to the switching element, and

a sum of areas of the first to fourth pixels is substantially the same as an area of the dot.

2. The organic light emitting device of claim 1, wherein

a sum of an area of the third pixel and the fourth pixel is larger than an individual area of the first pixel and the second pixel.

3. The organic light emitting device of claim 2, wherein

the first to fourth pixels respectively comprise an organic light emitting material, and

the organic light emitting material of the third and fourth pixels has a shorter life than a life of the organic light emitting material of the first and second pixels.

4. The organic light emitting device of claim 3, wherein

the first to fourth pixels form a rectangle having long sides and short sides, and

the first to fourth pixels are arranged in a line in the extended direction of the short sides.

5. The organic light emitting device of claim 4, wherein

a length of each the long sides of the first to fourth pixels is four times a length of the short sides.

6. The organic light emitting device of claim 2, wherein

the first to fourth pixels form a 2×

2 matrix.

7. The organic light emitting device of claim 6, wherein

each of the first to fourth pixels is a square.

8. The organic light emitting device of claim 2, wherein

areas of each of the first to fourth pixels are substantially the same.

9. The organic light emitting device of claim 1, wherein

voltages applied to the third and fourth pixels are different from each other.

10. The organic light emitting device of claim 1, wherein

voltages applied to the third and fourth pixels are the same.

11. The organic light emitting device of claim 1, further comprising:

a signal controller generating output image signals for the first to fourth pixels based on the input image signals of red, green, and blue for representing luminance; and

a data driver coupled to the signal controller, the data driver generating data voltages corresponding to the output image signals to apply to the first to fourth pixels,

wherein each pixel emits light according to the data voltages, and

a luminance sum of the third pixel and the fourth pixel is substantially the same as a luminance of the input image signal of the blue.

12. The organic light emitting device of claim 11, wherein

a number of grays that the third pixel and the fourth pixel may respectively represent is the same as a number of grays that the first pixel and the second pixel may represent.

13. The organic light emitting device of claim 11, wherein

a number of grays that the third pixel and the fourth pixel may respectively represent is less than a number of grays that the first and second pixels may represent.