ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20140319483A1
• Filed: 12/19/2013
• Published: 10/30/2014
• Est. Priority Date: 04/26/2013
• 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, Kyu-Seok, YUN, Young-Nam, MOON, Ji-Hye
• Granted Patent: US 9,142,597 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 59/10 OLED displays
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

An organic light emitting diode (OLED) display includes a substrate including a central area and a peripheral area adjacent the central area and bent at the center thereof, a first central OLED disposed on the central area of the bent substrate and including a first central organic emission layer having a first central thickness, and a first surrounding OLED disposed on the peripheral area of the bent substrate and including a first surrounding organic emission layer having a first surrounding thickness.

Claims

1. An organic light emitting diode (OLED) display device, comprising a first central OLED and a first surrounding OLED respectively disposed in a central area and a peripheral area of a bent substrate, a thickness of an first surrounding organic emission layer of the first central OLED being less than a thickness of a first central organic emission layer of the first surrounding OLED, the first central OLED and the first surrounding OLED emitting light having a same first color.

2. The OLED display device of claim 1, wherein the first central OLED further includes a first central bottom electrode and a first central top electrode facing each other and disposed on opposite sides of the first central organic emission layer, and the first surrounding OLED further includes a first surrounding bottom electrode and a first surrounding top electrode facing each other and disposed on opposite sides of the first surrounding organic emission layer.

3. The OLED display device of claim 2, wherein a distance between the first central bottom electrode and the first central top electrode along a virtual vertical line perpendicular to the first central bottom electrode is identical to a distance between the first surrounding bottom electrode and the first surrounding top electrode along a line parallel to the virtual vertical line.

4. The OLED display device of claim 2, wherein the first central bottom electrode and the first surrounding bottom electrode are light reflective and the first central top electrode and the surrounding top electrode are transflective.

5. The OLED display device of claim 2, wherein the first central top electrode and the surrounding top electrode are integrated with each other.

6. The OLED display device of claim 2, wherein the first central bottom electrode and the first central top electrode come into contact with the first central organic emission layer and the first surrounding bottom electrode and the surrounding top electrode come into contact with the first surrounding organic emission layer.

7. The OLED display device of claim 1, wherein the first central organic emission layer includes a central assistant layer, the first surrounding organic emission layer includes a surrounding assistant layer, and a thickness of the surrounding assistant layer is less than a thickness of the central assistant layer.

8. The OLED display device of claim 7, wherein each of the central assistant layer and the surrounding assistant layer includes one or more of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer and an electron blocking layer.

9. The OLED display device of claim 1, further comprising:

a second central OLED neighboring the first central OLED and including a second central organic emission layer, a thickness of the second central organic emission layer being less than the thickness of the first central organic emission layer;

a third central OLED neighboring the second central OLED and including a third central organic emission layer, a thickness of the third central organic emission layer being less than the thickness of the second central organic emission layer;

a second surrounding OLED neighboring the first surrounding OLED and including a second surrounding organic emission layer, a thickness of second surrounding organic emission layer being less than the thickness of the first surrounding organic emission layer, the second surrounding OLED and the second central OLED emitting light having a same second color; and

a third surrounding OLED neighboring the second surrounding OLED and including a third surrounding organic emission layer, a thickness of third surrounding organic emission layer being less than the thickness of the second surrounding organic emission layer, the third surrounding OLED and the third central OLED emitting light having a same third color.

10. The OLED display device of claim 9, wherein the first central organic emission layer and the first surrounding organic emission layer emit red light, the second central organic emission layer and the second surrounding organic emission layer emit green light, and the third central organic emission layer and the third surrounding organic emission layer emit blue light.

11. The OLED display device of claim 9, wherein the first color, the second color, and the third color are white color.

12. The OLED display device of claim 11, wherein the first color is red color, the second color is green color, and the third color is blue color.

13. The OLED display device of claim 1, wherein the peripheral area is spaced apart from a tangent plane of the bent substrate that has a point of tangency located in the center area.

14. An organic light emitting diode (OLED) display device, comprising:

a substrate including a central area and a peripheral area adjacent the central area and bent at a center of the substrate; and

a plurality of OLEDs disposed on the bent substrate over the central area to the peripheral area and including organic emission layers having thicknesses gradually decreasing such that an OLED disposed in the central area is thicker than an OLED disposed in the peripheral area.

15. The OLED display device of claim 14, wherein the organic emission layers included in the plurality of OLEDs emit light having a same color.