Organic light emitting diode display

• US 9,165,983 B2
• Filed: 01/31/2014
• Issued: 10/20/2015
• Est. Priority Date: 04/17/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jang, Sang-Eok, Lee, Sung-Soo, Nam, Eun-Kyoung, Kim, Se-Il
• Primary Examiner(s): WOJCIECHOWICZ, EDWARD JOSEPH
• Application Number:
  US14/169,368
• Publication Number:
  US 20140312325A1
• Time in Patent Office: 627 Days
• Field of Search: 257/40
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

An organic light emitting diode display includes a substrate including a plurality of subpixel areas, a plurality of pixel electrodes positioned corresponding to each of the plurality of subpixel areas on the substrate, a white emission layer formed on the plurality of pixel electrodes; a common electrode covering the white emission layer, a plurality of capping layers positioned corresponding to each of the plurality of subpixel areas on the common electrode, and a color filter layer including a plurality of filter layers corresponding to each of the plurality of subpixel areas. At least two capping layers among the plurality of capping layers have any one of a refractive index and a thickness different from each other.

Claims

1. An organic light emitting diode display, comprising:

a substrate including a plurality of subpixel areas;

a plurality of pixel electrodes positioned corresponding to each of the plurality of subpixel areas on the substrate;

a white emission layer formed on the plurality of pixel electrodes;

a common electrode covering the white emission layer;

a plurality of capping layers positioned corresponding to each of the plurality of subpixel areas on the common electrode; and

a color filter layer including a plurality of filter layers corresponding to each of the plurality of subpixel areas,

wherein at least two capping layers among the plurality of capping layers have any one of a refractive index and a thickness different from each other,

the plurality of subpixel areas includes a red subpixel area, a green subpixel area, and a blue subpixel area,

the capping layer includes a first capping layer corresponding to the red subpixel area, a second capping layer corresponding to the green subpixel area, and a third capping layer corresponding to the blue subpixel area, and

the plurality of subpixel areas further includes a white subpixel area with no capping layer thereon.

2. The organic light emitting diode display of claim 1, wherein at least two among the first capping layer, the second capping layer, and the third capping layer have a refractive index different from one another.

3. The organic light emitting diode display of claim 2, wherein:

the first capping layer has a refractive index of 2.7 to 3.6, and

the second capping layer and the third capping layer have a refractive index of 2 to 3.

4. The organic light emitting diode display of claim 1, wherein the first capping layer, the second capping layer, and the third capping layer all have different thicknesses.

5. The organic light emitting diode display of claim 4, wherein:

the first capping layer has a thickness of 95 Å

to 135 Å

,

the second capping layer has a thickness of 50 Å

to 90 Å

, and

the third capping layer has a thickness of 40 Å

to 80 Å

.

6. The organic light emitting diode display of claim 5, wherein the first capping layer, the second capping layer, and the third capping layer have the same refractive index.