| http://www.w3.org/ns/prov#value | - a driving unit, electrically connected to the light emitting units and the detecting unit, for driving the light emitting units according to the switched-on number of the light emitting units and a dithering scheme wherein a number of the light emitting units is 4n, the light emitting units are arranged in a 2n???2n matrix, and n is a positive integer; wherein the energy level calculating unit det
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