Patent ID: 8730575

Claim:
A wire-grid polarizer comprising: a light-transmitting substrate having a plurality of ridges formed in parallel to one another at certain pitches through respective flat portions disposed between adjacent ridges, each of the ridges having a width gradually reduced from a base portion to a top portion thereof; a metal layer composed of metal or a metal compound, the metal layer covering the entirety of a first lateral face of each ridge and a part of the flat portion adjacent to the first lateral face such that a second lateral face of each ridge is only partially covered with the metal layer, and wherein a ratio (Dbp/Pp) of a width Dbp of the base portion of the ridge to each pitch Pp is from 0.1 to 0.7, and wherein Tp-Tp1=±5%, Ts-Ts1=±5%, Tp-Tp2=±5%, and Ts-Ts2=±5%, wherein Tp is a value of p-polarized light transmittance, and Ts is a value of s-polarized light transmittance obtained when light enters from a height direction of each ridge, Tp 1 is a value of p-polarized light transmittance, and Ts 1 is a value of an s-polarized light transmittance obtained when light entered on the first lateral face of each ridge from a direction orthogonal to a longitudinal direction of each ridge and forming an angle of 45 degrees toward the first lateral face with respect to the height direction of each ridge, and Tp 2 is a value of p-polarized light transmittance, and Ts 2 is a value of an s-polarized light transmittance obtained when light enters on a second lateral face of each ridge from a direction orthogonal to the longitudinal direction of each ridge and forming an angle of 45 degrees toward the second lateral face with respect to the height direction of each ridge.