REFLECTION TYPE LIQUID CRYSTAL DISPLAY ELEMENT, DISPLAY UNIT, PROJECTION OPTICAL SYSTEM, AND PROJECTION DISPLAYSYSTEM

摘要

A superior reflex type vertically-aligned liquid crystal display device wherein the refractive index anisotropy DELTA n of its liquid crystal material is controlled to be more than 0.1, and the transmissivity of the liquid crystal is saturated with facility at a low voltage below 5 to 6V despite a reduction of the thickness of the vertically-aligned liquid crystal layer to less than 2 mu m, hence achieving satisfactory driving at a practically low voltage while attaining another advantage of remarkable improvement in the transmissivity itself. Therefore, the display device indicates a sufficient transmissivity, an excellent low-voltage driving characteristic and a fast response. Further improvements are realizable in a display apparatus, a projection optical system and a projection display system by the use of such display device.