Polarization recovery system for projection displays
View Patent ↗A light guide comprising three guide sections and a light coupling element between the light guide sections. The light coupling element having an internal polarizing surface for reflecting light of a predetermined polarization state. Each light guide section has an entrance aperture, an exit aperture and at least first and second guide walls defining a light guide direction.
1. A light engine in a projection display system comprising:
a beam splitter for splitting light from a source into two or more light components;
a light guide comprising:
at least a source branch for guiding light from the source to the beam splitter; and
an output branch comprising at least first and second components for guiding the light components away from the beam splitter.
2. A projection display system comprising:
a light engine for a projection display system comprising:
a beam splitter for splitting light from a source into two or more light components;
a light guide comprising:
at least a source branch for guiding light from the source to the beam splitter; and
an output branch comprising at least first and second components for guiding the light components away from the beam splitter;
at least one light modulator panel for modulating light in accordance with a display signal; and
a projection lens for projecting the modulated light onto a display screen.
3. The projection display system of claim 2 in which a polarizer and polarizing beam splitter (PBS) are provided between the light engine and the light modulating panel, the PBS having a surface for transmitting light of a first polarization state and reflecting light of a second polarization state transverse to the first polarization state.