Patent ID: 7502081

Claim:
A reflection type liquid-crystal display device, comprising: a reflection type liquid-crystal display panel including a liquid-crystal cell and a reflector, said liquid-crystal cell having a visual-side substrate, a back-side substrate and a liquid crystal, said visual-side substrate including a transparent substrate, a low-refractive-index transparent layer lower in refractive index than the transparent substrate, and a transparent electrode, said back-side substrate having an electrode, said liquid crystal being held between said visual-side and back-side substrates so that respective electrode sides of said visual-side and back-side substrates are disposed opposite to each other, said reflector being disposed on the back-side substrate side; at least one illuminator disposed on one of side surfaces of said transparent substrate of said visual-side substrate; and an optical path control layer distinct from said transparent substrate of said visual-side substrate and having a repetitive structure of optical path changing slopes on an outer side of said visual-side substrate and being higher in refractive index than said low-refractive-index transparent layer, each of said optical path changing slopes being inclined at an inclination angle in a range of from 35 to 48 degrees with respect to a reference plane of said visual-side substrate, wherein an incident light from said illuminator is transmitted to said optical path control layer through said visual-side substrate, wherein there is a difference in refractive index between the optical path control layer and the visual-side substrate not larger than 0.15, and wherein the optical path control layer has a refractive index higher by 0.05 or more than that of the low-refractive-index transparent layer.