| http://www.w3.org/ns/prov#value | - Hence, the turned-over light can be partially or wholly transmitted, so that improvement of luminance can be achieved by the improvement in light utilizing efficiency. [0072] In the present invention, optical devices or parts such as a light pipe for forming the aforementioned plane light source unit or liquid-crystal display device, a liquid-crystal cell, a polarizer, etc. may be wholly or partia
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