From FIG. 3, the display - in between inter-camera distance 1000mm of 2400mm, it is almost a straight line of the graph there is no rapid change. This contrast in relation to the normal brightness and illuminance are considered as a radiate of the point light source, the number of displays are popular, the directivity of the backlight is controlled, that behaves as a parallel light source shows. (Therefore it has been determined in such a proposed method.)
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