Display device and manufacturing method thereof

Abstract

A display device includes: a substrate including a first flat area, a second flat area, and a bending area between the first flat area and the second flat area; a display unit overlapping the first flat area and disposed on a surface of the substrate; first and second protection layers on an opposing surface of the substrate and overlapping the first and second flat areas, respectively. The first and second protection layers include a hardening member including a photo-hardening resin, the first protection layer includes a first inclination part at an end, the second protection layer includes a second inclination part at an end, the first inclination part has a first inclination angle with the opposing surface, the second inclination part has a second inclination angle with the opposing surface, and the first and second inclination angles are in a range of about 10 degrees to about 90 degrees.

What is claimed is: 
     
         1 . A manufacturing method of a display device comprising:
 providing a display unit including a plurality of thin film transistor on a surface of a substrate; and   coating and curing a photo-hardening resin on an opposing surface of the substrate, which is opposite to the surface of the substrate, to form a first protection layer and a second protection layer,   wherein the photo-hardening resin is coated through an Inkjet process.   
     
     
         2 . The manufacturing method of  claim 1 , wherein
 the coating of the photo-hardening resin includes coating the photo-hardening resin by a printing device including a nozzle,   the nozzle discharges droplets of the photo-hardening resin,   the display device includes a first flat area in which the display unit is provided, a bending area adjacent to the first flat area, and a second flat area adjacent to the bending area, and   the nozzle discharges fewer droplets of the photo-hardening resin from the first flat area toward the bending area and discharges fewer droplets of the photo-hardening resin from the second flat area toward the bending area.   
     
     
         3 . The manufacturing method of  claim 1 ,
 Wherein the substrate including a first flat area, a second flat area, and a bending area disposed between the first flat area and the second flat area;   the first protection layer overlaps the first flat area; and   the second protection layer overlaps the second flat area.   
     
     
         4 . The manufacturing method of  claim 1 ,
 wherein the first protection layer includes a first inclination part at an end thereof,   the second protection layer includes a second inclination part at an end thereof,   the first inclination part has a first inclination angle with the opposing surface of the substrate,   the second inclination part has a second inclination angle with the opposing surface of the substrate, and   each of the first inclination angle and the second inclination angle is greater than or equal to about 10 degrees and less than or equal to about 90 degrees.   
     
     
         5 . The manufacturing method of  claim 4 ,
 wherein the first inclination angle and the second inclination angle are in a range of about 30 degrees to about 45 degrees.   
     
     
         6 . The manufacturing method of  claim 4 ,
 wherein as the first inclination angle and the second inclination angle decrease, a strain received by the substrate at the bending area decreases.   
     
     
         7 . The manufacturing method of  claim 6 ,
 wherein a maximum value of the strain on one part of the substrate is about 1.4% during bending of the display device, and   a value of the strain is defined as: (strain length)/(initial length)×100(%).   
     
     
         8 . The manufacturing method of  claim 4 ,
 the first inclination part is formed at a part where the first flat area is adjacent to the bending area, and   the second inclination part is formed at a part where the second flat area is adjacent to the bending area.   
     
     
         9 . The manufacturing method of  claim 1 , wherein
 the photo-hardening resin includes at least one material selected from an acrylate-based compound including an acrylate-based polymer, a polyurethane, and SiO; and   the photo-hardening resin further includes at least one material selected from an acryl-based resin, a butyl rubber, a vinyl acetate resin, an ethylene vinyl acetate resin, a natural rubber, nitriles, a silicate resin, a silicone rubber and a styrene block polymer.   
     
     
         10 . The manufacturing method of  claim 1 , wherein
 each of the first protection layer and the second protection layer includes a first auxiliary layer, a second auxiliary layer and a third auxiliary layer, which are sequentially stacked one on another from the opposing surface of the substrate.   
     
     
         11 . The manufacturing method of  claim 10 , wherein
 the third auxiliary layer includes a heat dissipating material having heat conductivity.   
     
     
         12 . The manufacturing method of  claim 11 , wherein
 the heat dissipating material is a carbon composite material including at least one material selected from graphite, a carbon nanotube, a carbon fiber, and graphene.   
     
     
         13 . The manufacturing method of  claim 11 , wherein
 the third auxiliary layer further includes a dispersant including a dispersion photo-hardening resin.   
     
     
         14 . The manufacturing method of  claim 10 , wherein:
 the first auxiliary layer includes at least one material selected from an acryl-based resin, a butyl rubber, a vinyl acetate resin, an ethylene vinyl acetate resin, a natural rubber, nitriles, a silicate resin, a silicone rubber, and a styrene block polymer; and   the second auxiliary layer includes at least one material selected from an acrylate-based compound including an acrylate-based polymer, a polyurethane, and SiO.   
     
     
         15 . The manufacturing method of  claim 10 , wherein
 a connection part is disposed on the opposing surface of the substrate at the bending area, and   the connection part includes a same material as the second auxiliary layer.   
     
     
         16 . The manufacturing method of  claim 1 , wherein
 the first protection layer and the second protection layer are spaced apart from each other, and   a space between the first protection layer and the second protection layer overlaps the bending area.   
     
     
         17 . The manufacturing method of  claim 1 , wherein
 an inclination degree of the end of the first and second protection layers is controlled by adjusting an amount of droplets of the photo-hardening resin discharged to the substrate.   
     
     
         18 . The manufacturing method of  claim 1 , wherein
 the first and second protection layers are provided without a separate adhesive layer.   
     
     
         19 . The manufacturing method of  claim 2 , wherein
 an amount of the discharged droplet is lower when the printing device is disposed at the side close to the bending area.   
     
     
         20 . The manufacturing method of  claim 19 , wherein
 wherein the droplets discharged at each position of the second flat area are combined with each other and flow toward the bending area to form the second inclination part.