PROJECTION TYPE LIQUID CRYSTAL DISPLAY UNIT

摘要

A projection type liquid crystal display unit has dichroic mirrors (53,54) capable of dividing a light from a light source (51) into R, G and B components which are guided along respective light paths. Each of at least two of these light paths is provided with an optical system which includes a pair of polarizing plates, a twist nematic liquid crystal (58,59,60) and at least one phase plate. The angles of the retardation phase axis of the phase plate and light-interruption axes of the polarizing plates or, alternatively, the retardation of the phase plate is determined so as to improve the light-interruption of the liquid crystal panel in light-interruption mode, thereby enhancing contrast of the display image.