Patent ID: 7030945

Claim:
A liquid-crystal display device comprising: a liquid-crystal display panel; a light source disposed on a side surface of said liquid-crystal display panel; and an optical path control layer, wherein: said liquid-crystal display panel includes a liquid-crystal cell, said liquid-crystal cell having a back side substrate, a visual side substrate, and liquid crystal, said back side substrate at least having a transparent substrate, a low-refractive-index transparent layer lower in refractive index than said transparent substrate, and a semi-transmission reflection layer transmitting a part of light while reflecting the other part of the light, said visual side substrate having a transparent substrate and a transparent electrode, said liquid crystal being held between said back side substrate and said visual side substrate arranged so that said electrode and semi-transmission reflection layer are opposite to each other with respect to said liquid crystal, and said optical path control layer being provided on an outer side of said back side substrate, said optical path control layer having a plurality of optical path changing slopes inclined at an inclination angle of from 35 to 48 degrees with respect to a reference plane of a corresponding one of said two substrates, and having a refractive index higher than that of said low-refractive-index transparent layer.