▁back light s , ▁instead ▁of ▁cold ▁c ath ode ▁flu ores cent ▁l amps ▁( CC FL ) ▁that ▁diff use ▁light ▁in ▁a ▁layer ▁of ▁pl astic . ▁Each ▁LED ▁has ▁ 2 5 6 ▁bright ness ▁steps , ▁where ▁step ▁ 0 ▁switch es ▁the ▁LED ▁off ▁and ▁step ▁ 2 5 5 ▁switch es ▁it ▁to ▁maximum ▁l umin ance . ▁As ▁a ▁result , ▁the ▁device ▁can ▁display ▁true ▁black ▁and ▁very ▁bright ▁white , ▁with ▁a ▁contrast ▁ratio ▁techn ically ▁of ▁infinity , ▁where ▁minimal ▁l umin ance ▁is ▁ 0   cd / m ² ▁( the ▁denomin ator ) ▁and ▁maximal ▁l umin ance ▁is ▁almost ▁ 4 , 0 0 0   cd / m ². ▁To ▁address ▁the ▁confusion ▁that ▁may ▁accomp any ▁a ▁display ▁with ▁a ▁quoted ▁contrast ▁ratio ▁of ▁infinity , ▁Bright side ▁calcul ates ▁its ▁quoted ▁contrast ▁ratio ▁using ▁the ▁next - dark est ▁level ▁available ▁on ▁the ▁display ▁to ▁arrive ▁at ▁a ▁contrast ▁ratio ▁of ▁ 2 0 0 , 0 0 0 : 1 . ▁ ▁Bright Side ▁produced ▁a ▁prototype ▁display ▁to ▁show case ▁their ▁technology : ▁the ▁DR 3 7 - P . ▁Target ed ▁indust ries ▁include ▁the ▁medical ▁field , ▁C AD , ▁film ▁post - production , ▁ge oph ys ical ▁data ▁and ▁satellite ▁imag ing . ▁ ▁On ▁April ▁ 2 5 , ▁ 2 0 0 7 ▁Dol by ▁Labor ator ies , ▁Inc . ▁announced ▁that ▁it ▁completed ▁the ▁ac