| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: FIG. 1 is a view showing the structure of a conventional projection display; FIG. 2 is a schematic view showing the structure of a conventional LED; FIG. 3 is a graph
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