An organic light-emitting display device and a top emitting oled device for improving viewing angle characteristics

Abstract

An organic light-emitting display device, comprising: a substrate; a first electrode ( 2 ) with reflective characteristic; a second electrode ( 8 ) with semi-transparent semi-reflective characteristic; a light output coupling layer ( 9 ), disposed on the second electrode ( 8 ); and an organic layer, disposed between the first electrode ( 2 ) and the second electrode ( 8 ), and comprising a hole injection layer ( 3 ), a hole transport layer ( 5 ), a light-emitting layer ( 7 ) and an electron transport layer ( 6 ), wherein, the hole injection layer ( 3 ) is adjacent to the first electrode ( 2 ) and disposed on the first electrode ( 2 ), the light-emitting layer ( 7 ) comprises a red-light emitting layer ( 63 ), a green-light emitting layer ( 62 ) and a blue-light emitting layer ( 61 ) respectively disposed in a red pixel area, in a green pixel area and in a blue pixel area; the organic light-emitting display device further comprises an optical compensation layer ( 421, 422, 431, 432 ) disposed between the hole injection layer ( 3 ) and the hole transport layer ( 5 ) in the green pixel area as well as in the red pixel area, and the optical compensation layer ( 421, 422, 431, 432 ) has a structure with at least two tiers. The optical compensation layers ( 421, 422, 431, 432 ) of the red pixel unit and of the green pixel unit have different thicknesses, and thus meet the optical path requirements of their respective spectrums. A top emitting OLED device for improving viewing angle characteristics, comprising a substrate ( 1 ′), a first electrode ( 2 ), a hole injection layer ( 3 ), a hole transport layer ( 5 ), a light-emitting layer ( 7 ), an electron transport layer ( 6 ), a second electrode ( 8 ) and a light output coupling layer ( 9 ), wherein, by increasing the refractive index of the hole injection layer ( 3 ), the interference enhancement condition between the reflected light from the first electrode ( 2 ) and the emitted light from the light-emitting layer ( 7 ) is broken, and the wide-angle interference in the OLED device is weakened, thereby inhibiting the micro-cavity effect; meanwhile, in cooperation with an ultra-thin structure of the second electrode ( 8 ) and assisted by the light output coupling layer ( 9 ), the transmittance rate and the light output rate of the emitted light from the light-emitting layer ( 7 ) is increased. This device can solve the technical problem that luminescent quality of top emitting OLED device deteriorates as the viewing angle deviates, which is applicable in the field of flat panel display.

1 . An organic light-emitting display device, comprising:
 a substrate;   a first electrode with reflective characteristic;   a second electrode with semi-transparent semi-reflective characteristic;   a light output coupling layer, disposed on the second electrode; and   an organic layer, disposed between the first electrode and the second electrode, and comprising a hole injection layer, a hole transport layer, a light-emitting layer and an electron transport layer, wherein, the hole injection layer is adjacent to the first electrode and disposed on the first electrode, the light-emitting layer comprises a red-light emitting layer, a green-light emitting layer and a blue-light emitting layer respectively disposed in a red pixel area, in a green pixel area and in a blue pixel area,   characterized in that,   the organic light-emitting display device further comprises an optical compensation layer disposed between the hole injection layer and the hole transport layer in the green pixel area as well as in the red pixel area, and the optical compensation layer has a structure with at least two tiers.   
     
     
         2 . The organic light-emitting display device in accordance with  claim 1 , characterized in that, the optical compensation layer in the green pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV; the optical compensation layer in the red pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV. 
     
     
         3 . The organic light-emitting display device in accordance with  claim 1 , characterized in that, the optical compensation layer in the green pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV; the optical compensation layer in the red pixel area comprises a first optical compensation tier, a second optical compensation tier, a third optical compensation tier and a fourth optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV, the third optical compensation tier is made of a material identical to that of the first optical compensation tier, and the fourth optical compensation tier is made of a material identical to that of the second optical compensation tier. 
     
     
         4 . The organic light-emitting display device in accordance with  claim 2 , characterized in that, the first optical compensation tier in the green pixel area and in the red pixel area is made of a material having a general formula of 
       
         
           
           
               
               
           
         
       
     
     
         5 . The organic light-emitting display device in accordance with  claim 2 , characterized in that, the second optical compensation tier in the green pixel area and in the red pixel area is made of a material having a general formula of 
       
         
           
           
               
               
           
         
       
     
     
         6 . The organic light-emitting display device in accordance with  claim 2 , characterized in that, the second optical compensation tier in the green pixel area and in the red pixel area is made of HAT(CN) with a molecular structure of 
       
         
           
           
               
               
           
         
       
     
     
         7 . (canceled) 
     
     
         8 . The organic light-emitting display device in accordance with  claim 2 , characterized in that, the hole injection layer has a two-tier structure which comprises a first hole injection tier disposed on the first electrode and a second hole injection tier disposed on the first hole injection tier, the first hole injection tier is made of a material identical to that of the first optical compensation tier, and the second hole injection tier is made of a material identical to that of the second optical compensation tier. 
     
     
         9 . (canceled) 
     
     
         10 . The organic light-emitting display device in accordance with  claim 2 , characterized in that, the first optical compensation tier is made of a material with a doped structure formed by doping 
       
         
           
           
               
               
           
         
       
       at a ratio of 100:1 to 5:1;
 or, the first optical compensation tier is made of a material with a doped structure formed by doping 
 
       
         
           
           
               
               
           
         
       
       at a ratio of 100:1 to 5:1. 
     
     
         11 . A top emitting OLED device for improving viewing angle characteristics, characterized in comprising:
 a substrate; and   a first electrode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, a second electrode and a light output coupling layer sequentially stacked on the substrate,   wherein the second electrode has a light transmittance no less than 25%, and the hole injection layer has a refractive index no less than 1.8.   
     
     
         12 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 11 , characterized in that, the second electrode is made of indium tin oxide, indium zinc oxide or metal silver. 
     
     
         13 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 11 , characterized in that, the second electrode comprises a first metal layer and a second metal layer, wherein the first metal layer is alkali metal or alloy thereof, alkali earth metal or alloy thereof, and the second metal layer is metal silver. 
     
     
         14 .- 17 . (canceled) 
     
     
         18 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 11 , characterized in that, the hole injection layer is made of tertiary amine compound with a molecular general formula of 
       
         
           
           
               
               
           
         
         wherein R 2 , R 3 , R 4 , R 5  are respectively selected from hydrogen atom, alkyl group and aromatic group; 
         wherein R 1  is 
       
       
         
           
           
               
               
           
         
       
       wherein L 1  and L 2  are acene compounds with respective molecular formulas of 
       
         
           
           
               
               
           
         
       
     
     
         19 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 18 , characterized in that, the hole injection layer is made of a material with a structural formula of 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         20 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 11 , characterized in that, the light output coupling layer is made of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline. 
     
     
         21 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 11 , characterized in further comprising an optical compensation layer disposed between the hole injection layer and the hole transport layer in the green pixel area as well as in the red pixel area, wherein the optical compensation layer has a structure with at least two tiers. 
     
     
         22 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 21 , characterized in that, the optical compensation layer in the green pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV; the optical compensation layer in the red pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV. 
     
     
         23 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 21 , characterized in that, the optical compensation layer in the green pixel area comprises a first optical compensation tier and a second optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV; the optical compensation layer in the red pixel area comprises a first optical compensation tier, a second optical compensation tier, a third optical compensation tier and a fourth optical compensation tier, wherein a difference value of the highest occupied molecular orbital energy level of the first optical compensation tier minus the lowest unoccupied molecular orbital energy level of the second optical compensation tier is ≧−0.2 eV, the third optical compensation tier is made of a material identical to that of the first optical compensation tier, and the fourth optical compensation tier is made of a material identical to that of the second optical compensation tier. 
     
     
         24 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 21 , characterized in that, the first optical compensation tier in the green pixel area and in the red pixel area is made of a material having a general formula of 
       
         
           
           
               
               
           
         
       
     
     
         25 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 21 , characterized in that, the second optical compensation tier in the green pixel area and in the red pixel area is made of a material having a general formula of 
       
         
           
           
               
               
           
         
       
     
     
         26 .- 27 . (canceled) 
     
     
         28 . The top emitting OLED device for improving viewing angle characteristics in accordance with  claim 21 , characterized in that, the hole injection layer has a two-tier structure which comprises a first hole injection tier disposed on the first electrode and a second hole injection tier disposed on the first hole injection tier, wherein the first hole injection tier is made of a material identical to that of the first optical compensation tier, and the second hole injection tier is made of a material identical to that of the second optical compensation tier. 
     
     
         29 .- 32 . (canceled)