Polarizing element, and plane light source unit and liquid crystal display apparatus using the same

摘要

The present invention relates to a polarizing element having excellent scattering and polarizing properties. The polarizing element which comprises a stretched sheet composed of a continuous phase 1 and a dispersed phase 2 and the dispersed phase is dispersed in the form of a particle in the continuous phase 1 is prepared. In the element, the continuous phase 1 comprises a first transparent resin and the dispersed phase 2 comprises a second transparent resin, and the refractive index differential between the continuous phase and the dispersed phase on a linear polarized light in a stretched direction of the sheet is different from that in a direction perpendicular to the stretched direction, a polarized light in a direction having smaller refractive index differential is transmittable and a polarized light in a direction having larger refractive index differential is scattered, and the continuous phase 1 and the dispersed phase 2 are bonded each other substantially free from voids between their phases. A plane or flat light source unit and a transmittable or a reflection type-liquid crystal display apparatus comprising the polarizing element have high luminance.