USRE50670EActiveUtility

Electroluminescence display device

77
Assignee: LG DISPLAY CO LTDPriority: Jun 24, 2016Filed: Oct 23, 2023Granted: Nov 18, 2025
Est. expiryJun 24, 2036(~10 yrs left)· nominal 20-yr term from priority
Inventors:Yeongyun YangBonggeum LeeWonkeun ParkSohee YuHanyoung Cho
H10K 59/12H10K 50/828H10K 50/818H10K 50/865H10K 50/858H10K 59/8792H10K 59/879H10K 59/8723H10K 59/80524H10K 59/80518H10D 86/441H10D 86/60H10D 30/6723H10K 2102/3026H10K 2102/351H10K 2101/10H10K 59/1201H10K 59/1213H10K 59/126H10K 59/124H10K 59/123H10K 59/121H10K 50/11H10K 59/122
77
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Cited by
71
References
27
Claims

Abstract

Embodiments disclosed herein relate to an electroluminescence display device including a first electrode, a second electrode facing the first electrode, an emission layer between the first electrode and the second electrode, and a bank layer defining the emission layer. The bank layer may be disposed between the first electrode and the second electrode. The bank layer may include a first bank layer and a second bank layer. The second bank layer may include a black pigment. The first bank layer may be closer to the first electrode than the second bank layer, and the first bank layer may have a lower permittivity than the second bank layer.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An electroluminescence display device comprising:
 a thin film transistor on a surface of a substrate facing in a first direction;   a planarization layer on the surface of the substrate, the planarization layer covering the thin film transistor, the thin film transistor disposed between the planarization layer and the substrate, the planarization layer having a first area having a first thickness along the first direction and a second area having a second thickness along the first direction, the first thickness smaller than the second thickness;   a first electrode on the first area of the planarization layer, the first electrode electrically connected to the thin film transistor;   a bank layer on a portion of the second area of the planarization layer, the bank layer including a black pigment;   an emission structure including a transport layer and a light emitting layer on a surface of the first electrode facing in the first direction; and   a second electrode on a surface of the emission structure facing in the first direction,   wherein the emission structure has a different thickness for each of a red sub-pixel area, a green sub-pixel area, and a blue sub-pixel area.   
     
     
         2 . The electroluminescence display device according to  claim 1 , wherein at least a part of the first electrode is positioned on an inclined surface of the planarization layer, the inclined surface disposed between the first area and the second area of the planarization layer. 
     
     
         3 . The electroluminescence display device according to  claim 2 ,
 wherein the inclined surface of the planarization layer faces in a slanted direction from the first direction.   
     
     
         4 . The electroluminescence display device according to  claim 1 , wherein an optical density of the bank layer is 4 or less. 
     
     
         5 . A display apparatus, comprising:
 a substrate including an upper surface and a lower surface;   a thin film transistor on the upper surface of the substrate;   a planarization layer covering the thin film transistor and the upper surface of the substrate, the planarization layer including a first portion having a first thickness and a second portion having a second thickness, the first thickness smaller than the second thickness;   a first electrode on the planarization layer, the first electrode being at the first portion of the planarization layer and electrically connected to the thin film transistor;   a bank layer on the planarization layer, the bank layer being at the second portion of planarization layer and including a black pigment;   an emission structure on the first electrode, the emission structure including a transport layer and a light emitting layer; and   ana second electrode on the emission structure, the emission structure between the first electrode and the second electrode,   wherein the emission structure has a different thickness for each of a red sub-pixel area, a green sub-pixel area, and blue sub-pixel area.   
     
     
         6 . The display apparatus according to  claim 5 , wherein the first portion of the planarization layer corresponds to an emission area where the first electrode and the emission structure are in direct contact with each other. 
     
     
         7 . The display apparatus according to  claim 6 , wherein the first portion of the planarization layer is overlapped with the emission area. 
     
     
         8 . The display apparatus according to  claim 5 , wherein the first electrode is spaced apart from the second portion of the planarization layer. 
     
     
         9 . The display apparatus according to  claim 5 , wherein the second portion of the planarization layer includes an inclined surface, an upper surface, and a lower surface, the first portion of the planarization layer includes an upper surface and a lower surface, the upper surface of the first portion is connected to the inclined surface of the second portion. 
     
     
         10 . The display apparatus according to  claim 9 , wherein both ends of the first electrode are on the inclined surface of the second portion of the planarization layer. 
     
     
         11 . The display apparatus according to  claim 10 , wherein the both ends of the first electrode are interposed between the inclined surface of the second portion of the planarization layer and the emission structure. 
     
     
       12. An electroluminescence display device comprising:
 a thin film transistor on a surface of a substrate facing in a first direction;   a planarization layer on the surface of the substrate, the planarization layer covering the thin film transistor, the thin film transistor disposed between the planarization layer and the substrate, the planarization layer having a first area having a first thickness along the first direction, a second area having an inclined surface and a second thickness along the first direction, the first thickness smaller than the second thickness;   a first electrode on the first area of the planarization layer and over the inclined surface of the second area of the planarization layer, the first electrode electrically connected to the thin film transistor;   a bank layer on a portion of the second area of the planarization layer, the bank layer including a black pigment;   an emission structure including a transport layer and a light emitting layer on a surface of the first electrode facing in the first direction; and   a second electrode on a surface of the emission structure facing in the first direction,   wherein the emission structure has a different thickness for each of a red sub-pixel area. green sub-pixel area and blue sub-pixel area.   
     
     
       13. The electroluminescence display device of  claim 12 , wherein the first electrode overlaps the inclined surface of the planarization layer. 
     
     
       14. The electroluminescence display device of  claim 13 , wherein the first electrode comprises a first end and a second end that is opposite the first end, the first end and the second end are over the inclined surface. 
     
     
       15. The electroluminescence display device of  claim 12 , wherein the emission structure is over the inclined surface of the planarization layer. 
     
     
       16. The electroluminescence display device of  claim 15 , wherein the emission structure extends over an upper surface of the second area of the planarization layer. 
     
     
       17. The electroluminescence display device of  claim 16 , wherein the emission structure extends over an upper surface of the bank layer. 
     
     
       18. The electroluminescence display device of  claim 12 , wherein the second electrode is over the inclined surface of the planarization layer. 
     
     
       19. The electroluminescence display device of  claim 18 , wherein the second electrode extends over an upper surface of the second area of the planarization layer. 
     
     
       20. The electroluminescence display device of  claim 19 , wherein the second electrode extends over the bank layer. 
     
     
       21. The electroluminescence display device of  claim 12 , further comprising:
 a spacer on the bank layer, the spacer having an end that does not extend beyond an end of the bank layer.   
     
     
       22. The electroluminescence display device of  claim 21 , wherein the spacer is transparent. 
     
     
       23. The electroluminescence display device of  claim 12 , wherein the planarization layer is between the first electrode and the thin film transistor. 
     
     
       24. The electroluminescence display device of  claim 12 , wherein the first electrode comprises a plurality of layers. 
     
     
       25. The electroluminescence display device of  claim 24 , wherein the plurality of layers of the first electrode includes a transparent layer and a reflective layer. 
     
     
       26. The electroluminescence display device of  claim 12 , wherein the bank layer includes a portion that is transparent. 
     
     
       27. The electroluminescence display device of  claim 12 , further comprising:
 at least one interlayer between first electrode and substrate.

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