Light guide plate apparatus and liquid crystal display using the same

Abstract

A light guide plate apparatus and liquid crystal display using the same. The apparatus comprises a light guide plate and a light source, wherein the light guide plate includes an incident face, a reflection face, and a departure face. The reflection face meets the incident face at an acute angle and has a normal line and a critical angle θn of a total reflection. The departure face meets the incident face at an obtuse angle. The incident face meets the normal line of the reflection face at an angle θ. The light source projects a beam of light to the incident face at a radiation angle which is less than or equal to a predetermined value Φ, wherein θ=90°−Φ−θn. The apparatus, when applied to a liquid crystal display, is disposed in such a way that the beam of light propagating out from the departure face enters the liquid crystal display panel.

Dependencies are inferred from the claim text.