Apparatus for lighting of liquid crystal display

Abstract

Abstract With the aim of mitigating a decrease in flux of light and improving the light utilization efficiency, an optical conductor used in a liquid crystal lighting apparatus is constructed of a plurality of refractive layers N₁, N₂, ..., N i of different refractive indices which are gradually lowered from light incident end surfaces to a center portion of the optical conductor. Light coming from the light incident end surfaces is refracted at interfaces of the refractive layers N₁, N₂, ..., N i so as to reach a light outgoing surface at an incident angle ϑ i which is smaller than a critical angle ϑ w , thereby preventing all the beams from undergoing total reflection at the light outgoing surface and shortening the optical length in the optical conductor.

Inventors

• 👤 Masao Obata

Bibliographic Details