Display device and manufacturing method thereof

Abstract

Provided are a display device and a manufacturing method thereof capable of improving a viewing angle. The display device includes: a substrate; a switching element; a pixel electrode; a common electrode; a roof layer; a liquid crystal layer; and an encapsulation layer. The switching element is on the substrate. The pixel electrode is connected with the switching element. The common electrode is spaced apart from the pixel electrode on the pixel electrode with a plurality of microcavities comprising a microcavity therebetween. The roof layer is on the common electrode. The liquid crystal layer fills the microcavity. The encapsulation layer is on the roof layer to seal the microcavity, in which the common electrode includes a protrusion protruding upwards from a portion contacting an upper surface of the microcavity.

What is claimed is: 
     
         1 . A manufacturing method of a display device, comprising:
 forming a switching element on a substrate;   forming a pixel electrode connected with the switching element;   forming a sacrificial layer including a protrusion on the pixel electrode;   forming a common electrode on the sacrificial layer;   forming a roof layer on the common electrode;   patterning the common electrode and the roof layer so that a part of the sacrificial layer is exposed;   forming a microcavity between the pixel electrode and the common electrode by removing the sacrificial layer;   forming a liquid crystal layer by injecting a liquid crystal material into the microcavity; and   forming an encapsulation layer to seal the microcavity.   
     
     
         2 . The manufacturing method of  claim 1 , wherein:
 the protrusion protrudes upwards from an upper surface of the sacrificial layer.   
     
     
         3 . The manufacturing method of  claim 1 , wherein:
 a cross-sectional shape of the protrusion has at least one of a triangle, a semicircle, a quadrangle, a trapezoid, and a semioval.   
     
     
         4 . The manufacturing method of  claim 1 , wherein:
 a planar shape of the protrusion has a cross shape.   
     
     
         5 . The manufacturing method of  claim 2 , wherein:
 the common electrode includes a protrusion positioned on the protrusion of the sacrificial layer.   
     
     
         6 . The manufacturing method of  claim 5 , wherein:
 a height of the microcavity positioned below the protrusion of the common electrode is larger than a height of a microcavity of a portion where the protrusion of the common electrode is not formed.   
     
     
         7 . The manufacturing method of  claim 5 , wherein:
 a cross-sectional shape of the protrusion of the common electrode has at least one of a triangle, a semicircle, a quadrangle, a trapezoid, and a semioval.   
     
     
         8 . The manufacturing method of  claim 7 , wherein:
 a cross-sectional shape of the protrusion of the common electrode has a shape where an upper side of the trapezoid is modified to be a curved line.   
     
     
         9 . The manufacturing method of  claim 5 , wherein:
 a planar shape of the protrusion of the common electrode has a cross shape.   
     
     
         10 . The manufacturing method of  claim 9 , wherein:
 the protrusion of the common electrode includes   a horizontal protrusion,   a vertical protrusion, and   a central protrusion formed at a cross point of the horizontal protrusion and the vertical protrusion.