Curved glass and manufacturing method thereof

Abstract

The present disclosure relates to curved cover glass used for a curved display, and a manufacturing method thereof. The present disclosure provides tempered glass comprising: glass including a curved area; and a low-reflection coating layer, coated on a surface of the glass, composed of a mixture of a binder and a hollow material, wherein the glass comprises potassium ions which penetrate up to a predetermined depth therein. According to the present disclosure, a low-reflection coating layer is formed prior to curved surface processing, and thus, the low-reflection coating layer can be uniformly formed even on areas having different curvatures. Thus, the present disclosure can minimize the color difference generated in curved glass due to low-reflection coating layers.

1 . Tempered glass, comprising:
 a glass part having a curved region; and   a low-reflection coating layer coated on a surface of the glass part, the low-reflection coating layer comprising a mixture consisting of a binder and a hollow material,   wherein the glass part comprises potassium ions penetrated into the glass part through the low-reflection coating layer and the surface of the glass part by a predetermined depth.   
     
     
         2 . The tempered glass of  claim 1 , wherein a content ratio of the hollow material is higher at an inner portion of the low-reflection coating layer than at an outer portion of the low-reflection coating layer. 
     
     
         3 . The tempered glass of  claim 2 , wherein the binder comprises tetraethyl orthosilicate and trimethoxy-methylsilane that are polymerized together. 
     
     
         4 . The tempered glass of  claim 1 , wherein the glass part has a first region having a first curvature and a second region having a second curvature different from the first curvature. 
     
     
         5 . The tempered glass of  claim 4 , wherein the first region and the second region have a color difference (ΔE*ab) less than or equal to two. 
     
     
         6 . The tempered glass of  claim 4 , wherein the low-reflection coating layer has a first area coated on the first region and a second area coated on the second region, and
 wherein a thickness difference between the first area and the second area is less than or equal to 10% of a thickness of the first area or the second area.   
     
     
         7 . The tempered glass of  claim 1 , wherein an average molecular weight of the binder is 1500 to 3500. 
     
     
         8 . The tempered glass of  claim 1 , wherein an average particle size of the hollow material is 60 to 90 nm. 
     
     
         9 . The tempered glass of  claim 1 , wherein the low-reflection coating layer is a single layer. 
     
     
         10 . The tempered glass of  claim 1 , wherein the potassium ions are penetrated into the glass part by a depth of 30 to 50 um from the surface of the glass part. 
     
     
         11 . The tempered glass of  claim 1 , wherein a thickness of the low-reflection coating layer is 100 to 150 nm from the surface of the glass part. 
     
     
         12 . A method for manufacturing tempered glass, the method comprising:
 preparing a binder polymer comprising a first monomer and a second monomer;   preparing a low-reflection coating solution by mixing and polymerizing the binder polymer and a hollow material;   coating layer by coating the low-reflection coating solution on a glass part that is flat, and plasticizing the glass part to thereby define a low-reflection coating layer on the glass part;   molding the glass part coated with the low-reflection coating layer at a predetermined temperature to define a curved surface of the glass part; and   penetrating potassium ions into the glass part based on molding the glass part to define the curved surface.   
     
     
         13 . The method of  claim 12 , wherein preparing the binder polymer comprises polymerizing tetraethyl orthosilicate and trimethoxy-methylsilane together. 
     
     
         14 . The method of  claim 12 , wherein molding the glass part comprises molding the glass part to define a first region having a first curvature and a second region having a second curvature different from the first curvature. 
     
     
         15 . The method of  claim 14 , wherein the low-reflection coating layer has a first area coated on the first region and a second area coated on the second region, and
 wherein a thickness difference between the first area and the second area is less than or equal to 10% of a thickness of the first area or the second area.   
     
     
         16 . The method of  claim 14 , wherein penetrating potassium ions into the glass part comprises applying a solution comprising potassium to the glass part coated with the low-reflection coating layer. 
     
     
         17 . The method of  claim 12 , wherein an average molecular weight of the binder polymer is 1500 to 3500. 
     
     
         18 . The method of  claim 12 , wherein an average particle size of the hollow material is 60 to 90 nm. 
     
     
         19 . The method of  claim 12 , wherein applying the low-reflection coating layer comprises applying a single layer of the low-reflection coating solution to the glass part. 
     
     
         20 . The method of  claim 12 , wherein penetrating the potassium ions into the glass part comprises penetrating the potassium ions into the glass part by a depth of 30 to 50 um from a surface of the glass part.