Design of a compact projection display for the visualization of 3‐D images using polarization sensitive eyeglasses

Abstract

Abstract— A compact optical architecture of a three‐dimensional projection display that simultaneously generates two full‐color images with an orthogonal polarization state is presented. The minimal size of the optical engine was investigated and a compact illumination system using light‐emitting diodes as light sources was designed. The effect of dichroic mirrors in the illumination path on the stereoscopic images was also investigted.

State of the Art in Stereoscopic and Autostereoscopic Displays

“…The difficulty in aligning two projectors, increased cost, and power consumption may also be eliminated by employing a single projection unit [22], [23]. In this method, light-emitting diode (LED) illumination was used for the generation of two full-color images with orthogonal polarization states by a single modulation unit containing four liquid crystal on silicon (LCOS) devices (two for each eye) and some polarization controlling optics.…”

3.3: Efficient PolarizationBased Stereoscopic Projector with Extended Color Gamut: Combining Two Projectors into One

“…MacNeille PBSs also contribute to the weight and cost of the system since they are entirely made out of glass. A compact design of the original optical engine using MacNeille PBSs is discussed in [9]. Wire-grid PBSs do not introduce geometric depolarization and the transmission and reflection of polarized light is more uniform for large angular apertures.…”

Portable 3D Laser Projector Using Mixed Polarization Technique

“…Passive glasses with orthogonal polarizers for the left and right eyes blocks the image not intended for that eye. A single projector operated at a minimum of 120 Hz refresh rate with an active polarization rotator to rotate the polarization in between frames has also been demonstrated [9]- [11] and is commercially available for 3D TVs. The main drawback of these schemes is the increased frame rates and the blanking times required between switching cycles to reduce the crosstalk.…”