OPTICAL ROTATION BOARD, OPTICAL ELEMENT, CONDENSING BACKLIGHT SYSTEM AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical rotation board depending on an incident angle, where the angle to optically rotate the azimuth of the axis of polarization of incident polarized light differs according to the incident angle of the incident polarized light.

SOLUTION: The optical rotation board is formed of a cholesteric liquid crystal layer, and all of the selective reflection wavelength bands exist in a wavelength region longer than 610 nm.

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