CONVERGING ELEMENT, SURFACE LIGHT SOURCE USING THE SAME, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a converging element capable of taking out the emitting light as polarized light without depending especially on an azimuth angle in a converging function.

SOLUTION: A converging element having no pattern structure in optical observation from the surface side differently from a converging element based on a refractive index difference between two kinds of materials containing air and an interface structure has at least one polarization reflection layer and a phase difference layer. The polarization reflection layer is a circular polarization reflection layer having selective reflection of visible light wavelengths and capable of transmitting a certain circularly polarized light and selectively reflecting reverse circularly polarized light, and the phase difference layer transmits light of an angle around a normal direction as it is and changes a polarized state of light with an angle inclined from the normal direction by a phase difference.

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