Manufacturing method of roller used for manufacturing patterned retardation film

Abstract

A manufacturing method of a roller used for manufacturing a patterned retardation film is provided. The manufacturing method includes the following steps. A roller having a rotational axis and a roller surface is provided. An engraving device having an engraving end is provided. The engraving end has a plurality of sub-micron slots which are constructed in parallel with each other. The engraving device engraves the roller surface with a first depth to form a plurality of first sub-micron grooves. The engraving device engraves the roller surface with a second depth to form a plurality of second sub-micron grooves.

1 . A manufacturing method of a roller used for manufacturing a patterned retardation film comprising:
 providing a roller having a rotational axis and a roller surface;   providing an engraving device having an engraving end, wherein the engraving end has a plurality of sub-micron slots arranged in parallel;   engraving the roller surface with a first depth along the roller rotational direction to form a plurality of first regions with a plurality of first sub-micron grooves on the first regions by the engraving device, wherein the first sub-micron grooves are substantially parallel to the roller rotational direction; and   engraving the roller surface with a second depth along the roller rotational direction to form a plurality of second regions with a plurality of second sub-micron grooves on the second regions by the engraving device, wherein the second sub-micron grooves are substantially parallel to the roller rotational direction;   wherein, the first regions with the first sub-micron grooves and the second regions with the second sub-micron grooves are formed on the roller surface alternately.   
     
     
         2 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 1 , wherein the first depth is smaller than the second depth. 
     
     
         3 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 1 , wherein the width of the engraving device is substantially equal to the width of each first region and the width of each second region. 
     
     
         4 . A manufacturing method of a roller used for manufacturing a patterned retardation film comprising:
 providing a roller having a rotational axis and a roller surface;   providing an engraving device having an engraving end, wherein the engraving end has a plurality of sub-micron slots arranged in parallel;   engraving the roller surface with a first depth along a direction of a 37°-53° angle with respect to a roller rotational direction by the engraving device to form a plurality of first sub-micron grooves on the roller surface; and   engraving the roller surface with a second depth along the roller rotational direction to form a plurality of second regions with a plurality of second sub-micron grooves by the engraving device, wherein the second sub-micron grooves are substantially parallel to the roller rotational direction;   wherein, the second regions with second sub-micron grooves are formed with an equal distance.   
     
     
         5 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 4 , wherein the step of engraving the first sub-micron grooves further comprises:
 rotating the roller around the rotational axis; and   moving the engraving device along the rotational axis from one end of the roller to the other end to engrave the rotating roller surface with the first depth.   
     
     
         6 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 4 , wherein the step of engraving the second sub-micron grooves further comprises:
 rotating the roller around the rotational axis; and   engraving the roller surface with the second depth by the engraving device.   
     
     
         7 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 4 , wherein the step of engraving the second sub-micron grooves is performed after the step of engraving the first sub-micron grooves. 
     
     
         8 . A manufacturing method of a roller used for manufacturing a patterned retardation film comprising:
 providing a roller having a rotational axis and a roller surface;   providing an engraving device having an engraving end, wherein the engraving end has a plurality of sub-micron slots arranged in parallel;   engraving the roller surface with a first depth along a perpendicular direction which is perpendicular to a roller rotational direction by the engraving device to form a plurality of first sub-micron grooves on the roller surface; and   engraving the roller surface with a second depth along the roller rotational direction by the engraving device to form a plurality of second regions with a plurality of second sub-micron grooves by the engraving device, wherein the second sub-micron grooves are substantially parallel to the roller rotational direction;   wherein the second regions with the second sub-micron grooves are spaced with a distance to width of the second regions.   
     
     
         9 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 8 , wherein the step of engraving the first sub-micron grooves comprises:
 moving the engraving device along a direction perpendicular to the roller rotational direction to engrave the roller surface with the first depth.   
     
     
         10 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 8 , wherein the step of engraving the second sub-micron grooves comprises:
 rotating the roller around the rotational axis; and   engraving the roller surface with the second depth by the engraving device.   
     
     
         11 . The manufacturing method of a roller used for manufacturing a patterned retardation film according to  claim 8 , wherein the step of engraving the second sub-micron grooves is performed after the step of engraving the first sub-micron grooves.