Patent ID: 7524428

Claim:
A method for manufacturing a transparent substrate for a display device comprising: forming a polymer layer containing a copolymer selected from block copolymers and graft copolymers on at least one major surface of a transparent substrate; subjecting the polymer layer to annealing treatment to phase-separate the copolymer; removing one of the phases of the copolymer that has been phase-separated to form a mask layer having a pattern formed of the residual phase; and transcribing the pattern of mask layer onto a surface of the transparent substrate, thereby forming a surface-roughened substrate having a large number of recessed/projected portions, projected portions of the recessed/projected portions being meet the following conditions: (1) a mean circle-equivalent diameter ranging from 50 nm to 250 nm with the standard deviation of circle-equivalent diameter of the projected portions being within the range of 10 to 50% of the mean circle-equivalent diameter; (2) a mean height ranging from 100 nm to 500 nm with the standard deviation of height being within the range of 10 to 50% of the mean height; (3) a circularity coefficient ranging from 0.6 to 1; and (4) an area ratio ranging from 20 to 75%.