Why are active LC shutter glasses and an IR emitter, or passive polarized glasses and a polarization modulator required?
These additional technologies are used to target the projector’s output to your individual eyes, enabling you to perceive the stereo effect. The DepthQ® HDs3D-1 video projector displays a time-interleaved stream of left and right images at 120 frames per second. The viewing eyewear in either case is used to alternatively block images so that the right eye only sees the right image and the left eye only sees the left. In the case of active shutter glasses, the eyewear itself receives a wireless signal (typically infra-red, or IR) that synchronizes them with the projector output. The eyes then actively alternate between opaque and transparent at the appropriate moment in time. In the case of the DepthQ® Polarization Modulator, the modulator (placed in front of the projector) receives the synchronization signal and actively alternates the polarization orientation of light exiting the projector. These polarization-encoded L-R images are then projected onto a polarization-preserving screen,
