I've tried using a laptop screen, and an LCD computer monitor, and a LCD TV for flats... They are not uniformly illuminated.. It might look it, but they are not... Every time i have taken flats using an LCD of any type there has been anomalies.. I've seen perfect flats taken with light boxes, and perfect flats taken with the electro-luminescent panels Doug mentioned.. but an LCD is not the best way of doing it... With an opaque diffuser on it it might be ok..
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