(EN) The invention concerns a display device with a liquid crystal cell comprising a twisted nematic liquid crystal layer (40) set between two cross-polarizers (46, 48) and including, between the crystal liquid layer and at least one of the polarizers, a structure compensating variations in contrast of the cell based on the angle of observation. Said structure comprises at least two stacked negative uniaxial media such that the extraordinary optical axis of one (44, 42) is parallel to the cell normal line, and that of the other (43, 41) is inclined relatively to said normal line and relatively to the cell plane. Said compensating structure comprises an additional layer (59, 49) of a positive uniaxial birefringent material. The invention is applicable to liquid crystal displays in particular for avionics.
© KIPO & WIPO 2007
(KO) 새로운 복굴절 필름의 적층에 의한 LCD 스크린의 시야각의 개선