▁glass ▁pl ates ▁without ▁an ▁applied ▁electric ▁field ▁( OFF ▁state ), ▁the ▁inner ▁surfaces ▁of ▁the ▁glass ▁pl ates ▁are ▁treated ▁to ▁align ▁the ▁border ing ▁L C ▁mole cules ▁at ▁a ▁right ▁angle . ▁This ▁mole cular ▁structure ▁is ▁pract ically ▁the ▁same ▁as ▁in ▁T N ▁L CD s . ▁However , ▁the ▁arrangement ▁of ▁the ▁electro des ▁e 1 ▁and ▁e 2 ▁is ▁different . ▁Because ▁they ▁are ▁in ▁the ▁same ▁plane ▁and ▁on ▁a ▁single ▁glass ▁plate , ▁they ▁generate ▁an ▁electric ▁field ▁essentially ▁parallel ▁to ▁this ▁plate . ▁The ▁diagram ▁is ▁not ▁to ▁scale : ▁the ▁L C ▁layer ▁is ▁only ▁a ▁few ▁mic rom eters ▁thick ▁and ▁so ▁is ▁very ▁small ▁compared ▁with ▁the ▁distance ▁between ▁the ▁electro des . ▁ ▁The ▁L C ▁mole cules ▁have ▁a ▁positive ▁die lect ric ▁an is ot ropy ▁and ▁align ▁themselves ▁with ▁their ▁long ▁axis ▁parallel ▁to ▁an ▁applied ▁elect rical ▁field . ▁In ▁the ▁O FF ▁state ▁( sh own ▁on ▁the ▁left ), ▁entering ▁light ▁L 1 ▁becomes ▁linear ly ▁polar ized ▁by ▁polar izer ▁P . ▁The ▁tw isted ▁nem atic ▁L C ▁layer ▁rot ates ▁the ▁polar ization ▁axis ▁of ▁the ▁passing ▁light ▁by ▁ 9 0 ▁degrees , ▁so ▁that ▁ide ally ▁no ▁light ▁passes ▁through ▁polar izer ▁A . ▁In ▁the ▁ON ▁state , ▁a ▁sufficient ▁voltage ▁is ▁applied ▁between ▁electro des ▁and ▁a ▁corresponding ▁elect rical ▁field ▁E ▁is ▁generated ▁that ▁real ign s ▁the ▁L C ▁mole cules ▁as ▁shown