POLARIZER AND LIQUID-CRYSTAL DISPLAY DEVICE

摘要

A polarizer having at least one optical film and at least one polarizing film, wherein the absolute value of the photo-elastic coefficient C of the optical film is 2×10−12 Pa−1 or more, the optical film has an in-plane direction in which the sound propagation velocity is the maximum, and the angle between the in-plane direction in which the sound propagation velocity through the optical film is the maximum and the direction of the absorption axis of the polarizing film falls within a range of from 0° to less than 45°, is excellent in working aptitude and can prevent optical unevenness of the liquid-crystal display device accompanied by environmental changes.

主权项

1. A polarizer comprising at least one optical film and at least one polarizing film, wherein:
an absolute value of a photo-elastic coefficient C of the optical film is 2×10−12 Pa−1 or more, the optical film has an in-plane direction in which sound propagation velocity is the maximum, and an angle between an in-plane direction in which the sound propagation velocity through the optical film is the maximum and a direction of an absorption axis of the polarizing film falls within a range of from 0° to less than 45°, and wherein: the photo-elastic coefficient C of the optical film is a value measured in an environment at 25° C. and a relative humidity of 60%, at a wavelength of 590 nm, and the sound propagation velocity is a value measured in an environment at 25° C. and a relative humidity of 60%.