| http://www.w3.org/ns/prov#value | - The general thickness of the light pipe in the case where the light pipe is used for forming a reflection type liquid-crystal display device is not larger than 10 mm, particularly in a range of from 0.1 to 5 mm, further particularly in a range of from 0.4 to 3 mm, in terms of the height of the incidence side surface of the light pipe.
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