Organic light emitting diode display

• US 8,809,838 B2
• Filed: 02/08/2010
• Issued: 08/19/2014
• Est. Priority Date: 02/09/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jeong, Hee-Seong, Jeon, Hee-Chul, Jung, Woo-Suk, Jeong, Chul-Woo, Kwak, Noh-Min, Kim, Eun-Ah, Park, Soon-Ryong, Lee, Joo-Hwa
• Primary Examiner(s): Jung, Michael
• Assistant Examiner(s): SINGAL, ANKUSH K
• Application Number:
  US12/702,185
• Publication Number:
  US 20100200845A1
• Time in Patent Office: 1,653 Days
• Field of Search: 257/40
• US Class Current: 257/40
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3

Abstract

Embodiments provide an organic light emitting diode display. The display includes a substrate, a pixel electrode formed on the substrate, and an organic emissive layer formed on the pixel electrode. A common electrode is formed on the organic emissive layer. In addition, a crystallized light scattering layer is formed on the common electrode. The crystallized light scattering layer may be a crystallized organic or crystallized inorganic layer having a rough surface in order to effectively scatter light and prevent phenomenon, such as Newton'"'"'s Rings from occurring in the display.

Claims

1. An organic light emitting diode display comprising:

a substrate;

a pixel electrode formed over the substrate;

an organic emissive layer formed over the pixel electrode;

a common electrode formed over the organic emissive layer; and

a light scattering layer formed over the common electrode, the light scattering layer comprising a crystallized top surface which has a roughness value greater than that of a non-crystallized surface of the same material,

wherein the material of the light scattering layer is the same as a material for the organic emissive layer.

2. The organic light emitting diode display of claim 1, wherein the light scattering layer comprises a crystallized organic layer.

3. The organic light emitting diode display of claim 1, wherein the organic emissive layer emits light in a direction of the common electrode to display images.

4. The organic light emitting diode display of claim 1, wherein the crystallized top surface is roughened by crystallization of the material.

5. The organic light emitting diode display of claim 2, wherein the light scattering layer comprises an organic layer including one or more materials selected from the group comprising a-NPD, NPB, TPD, m-MTDATA, Alq₃, LiF, PBD, TLTA, and CuPc.

6. The organic light emitting diode display of claim 2, wherein the light scattering layer is crystallized through heat treatment.

7. An organic light emitting diode display comprising:

a substrate;

an organic emissive layer formed over the substrate;

a light scattering layer formed over the organic emissive layer, the light scattering layer comprises a crystallized top surface which has a roughness value greater than that of the non-crystallized surface of the same material,

wherein the material of the light scattering layer is the same as a material for the organic emissive layer.

8. The organic light emitting diode of claim 7, wherein the scattering layer comprises an organic material.

9. The organic light emitting diode of claim 7, wherein the scattering layer comprises a crystallized organic material.

10. The organic light emitting diode of claim 7, wherein the scattering layer comprises a surface roughness that prevents the occurrence of Newton'"'"'s rings within the organic light emitting diode display.

11. The organic light emitting diode display of claim 7, wherein the crystallized top surface is roughened by crystallization of the material.