Google Glass uses a Field Sequential Color LCOS to project the rendered image through a lens and into the retina, as first determined by Karl Guttag in March 2013.
Basically, the image of each single color channel is synthesized by an LCOS array on a chip, while the illumination source is rapidly cycled through pure red, green, and blue LEDs, in synchronization with the color channel switching.
Each of these sequential images is passed through a series of lens elements that direct the resultant image to the user’s retina via the Glass display. The result is that the user percieves a small translucent screen hovering at about arms length distance, as extended up and outward from the right eye. Since the colors are cycling very very quickly, the user perceives a full color video stream.
Here is a diagram of both the LCOS image generator, as well as the RGB lamps, and the lensing system:
structure of an FSC LCOS image generator
The determination of Glass utilizing an FSC LCOS is based on detailed analysis of the Google Glass Fashion Week video by Karl Guttag:
Sequential Red, Green, +Blue Fields Captured From Google YouTube Video DVF [through Glass]
Karl Guttag Glass Investigation:
Himax LCOS displays:
original post: Quora