US2017098686A1PendingUtilityA1

Organic light emitting diode display

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Assignee: SAMSUNG DISPLAY CO LTDPriority: Oct 2, 2015Filed: Apr 13, 2016Published: Apr 6, 2017
Est. expiryOct 2, 2035(~9.2 yrs left)· nominal 20-yr term from priority
Inventors:Hee-Seong JeongWon Ju KwonDal Ho KimGi Na YooDong Jin Lee
H10K 59/879H10K 59/873H10K 59/35H10K 50/13H01L 27/3265H01L 27/3211H01L 27/3262H01L 27/3276H01L 51/5072H01L 51/5275H01L 51/5092H01L 51/5237H01L 51/5056H10K 50/12H10K 2101/10H10K 50/171H10K 50/84H10K 59/1213H10K 2102/351H10K 50/11H10K 59/1216H10K 50/15H10K 50/844H10K 59/131H10K 50/16H10K 50/858
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Claims

Abstract

An organic light emitting diode (OLED) display includes a substrate, a first electrode disposed on the substrate, an organic emission layer disposed on the first electrode, a second electrode disposed on the organic emission layer, and a capping layer disposed on the second electrode, in which an optical thickness of the capping layer is in a range of about 1100 Å to about 1400 Å.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An organic light emitting diode (OLED) display, comprising:
 a substrate;   a first electrode disposed on the substrate;   an organic emission layer disposed on the first electrode;   a second electrode disposed on the organic emission layer; and   a capping layer disposed on the second electrode,   wherein an optical thickness of the capping layer is in a range of about 1100 Å to about 1400 Å.   
     
     
         2 . The OLED display of  claim 1 , wherein a refractive index of the capping layer is in a range of about 1.6 to about 2.6. 
     
     
         3 . The OLED display of  claim 2 , wherein a physical thickness of the capping layer is in a range of about 600 Å to about 730 Å when the refractive index of the capping layer is about 1.87. 
     
     
         4 . The OLED display of  claim 1 , wherein the optical thickness is measured at a wavelength of about 550 nm. 
     
     
         5 . The OLED display of  claim 1 , wherein the capping layer comprises an organic material or an inorganic material. 
     
     
         6 . The OLED display of  claim 5 , wherein the capping layer comprises at least one of a triamine derivative, an arylenediamine derivative, CBP, and tris(8-hydroxyquinoline) aluminum (Alq 3 ). 
     
     
         7 . The OLED display of  claim 1 , further comprising:
 a first color pixel, a second color pixel, and a third color pixel,   wherein:   each of the first color pixel, the second color pixel, and the third color pixel comprises the first electrode, the organic emission layer, the second electrode, and the capping layer; and   the organic emission layer comprises:
 a hole injection layer and a hole transporting layer disposed on the first electrode; 
 an emission layer disposed on the hole transporting layer, the emission layer comprising a host and a dopant; and 
 an electron transporting layer and an electron injection layer disposed on the emission layer. 
   
     
     
         8 . The OLED display of  claim 7 , wherein the emission layer of the first color pixel comprises:
 a first emission layer comprising the host; and   a second emission layer comprising the host and the dopant.   
     
     
         9 . The OLED display of  claim 8 , wherein the first emission layer does not comprise the dopant. 
     
     
         10 . The OLED display of  claim 9 , wherein the first color pixel is a green pixel. 
     
     
         11 . The OLED display of  claim 8 , wherein the second emission layer is disposed on the first emission layer. 
     
     
         12 . The OLED display of  claim 11 , wherein:
 the first emission layer contacts the hole injection layer or the hole transporting layer; and   the second emission layer contacts the electron transporting layer or the electron injection layer.   
     
     
         13 . The OLED display of  claim 8 , wherein the second emission layer is disposed between first emission layers. 
     
     
         14 . The OLED display of  claim 13 , wherein the second emission layer is disposed in a center region of the emission layer. 
     
     
         15 . The OLED display of  claim 13 , wherein:
 the first emission layer disposed on the second emission layer contacts the hole injection layer or the hole transporting layer; and   the first emission layer disposed under the second emission layer contacts the electron transporting layer or the electron injection layer.   
     
     
         16 . An organic light emitting diode (OLED) display, comprising:
 a substrate;   a first electrode disposed on the substrate;   an organic emission layer disposed on the first electrode;   a second electrode disposed on the organic emission layer; and   a capping layer disposed on the second electrode, the capping layer comprising a first capping layer and a second capping layer having different refractive indices from each other,   wherein:   an optical thickness of the first capping layer is in a range of about 60 Å to 210 Å; and   an optical thickness of the second capping layer is in a range of about 820 Å to about 1030 Å.   
     
     
         17 . The OLED display of  claim 16 , wherein:
 the second capping layer is disposed on the first capping layer; and   a refractive index of the second capping layer is higher than a refractive index of the first capping layer.   
     
     
         18 . The OLED display of  claim 17 , wherein a difference between the refractive index of the first capping layer and the refractive index of the second capping layer is in a range of about 0.1 to about 1.4. 
     
     
         19 . The OLED display of  claim 17 , wherein:
 the refractive index of the first capping layer is in a range of about 1.2 to about 1.5; and   the refractive index of the second capping layer is in a range of about 1.6 to about 2.6.   
     
     
         20 . The OLED display of  claim 19 , wherein a physical thickness of the first capping layer is in a range of about 50 Å to about 150 Å when the refractive index of the first capping layer is about 1.38. 
     
     
         21 . The OLED display of  claim 19 , wherein a physical thickness of the second capping layer is in a range of about 400 Å to about 500 Å when the refractive index of the second capping layer is about 2.0. 
     
     
         22 . The OLED display of  claim 16 , further comprising:
 a first color pixel, a second color pixel, and a third color pixel,   wherein:   each of the first color pixel, the second color pixel, and the third color pixel comprises the first electrode, the organic emission layer, the second electrode, and the capping layer; and   the organic emission layer comprises:
 a hole injection layer and a hole transporting layer disposed on the first electrode; 
 an emission layer disposed on the hole transporting layer, the emission layer comprising a host and a dopant; and 
 an electron transporting layer and an electron injection layer disposed on the emission layer. 
   
     
     
         23 . The OLED display of  claim 22 , wherein:
 the emission layer of the first color pixel comprises:
 a first emission layer, the first emission layer comprising the host and not comprising the dopant; and 
 a second emission layer comprising the host and the dopant; and the first color pixel is a green pixel.

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