Patent ID: 11169432

Abstract:
An LCD projector optical system includes: an LED light source, a transflective plate, a condensing device, a first focusing lens, a polarization modulation plate, a brightness-increasing polarizing plate, an LCD light valve, a field lens, a reflector, and a projection lens, which are all arranged sequentially along a light travel direction; wherein the transflective plate has a light-transmitting portion and a reflecting portion. Light from the LED light source enters the condensing device from the light-transmitting portion, and then transmitted light and reflected light in illumination light are separated by the brightness-increasing polarizing plate. A beam of polarized light useless for the LCD light valve is reflected back and condensed by the first focusing lens and the condensing device on the reflection portion and the light-transmitting portion of the transflective plate, and then reflected back to the brightness-increasing polarizing plate through the reflection portion and the light-transmitting portion.