March 18, 2010
| by George Walter
The high-speed LCD shutter glasses allow the appropriate left eye information to transmit to the left eye and right eye information to transmit to the right eye. Thus, total left and right eye signal can equal full 1920 x 1080, if that is the native resolution of the 3D TV.
High Tech: Active 3D Projectors
The latest 3-chip 3D projectors use a more advanced technology capable of supporting full Active 3D whereby a 120Hz signal is fed to the projector (full 1920 x 1080 60Hz, left; full 1920 x 1080 60Hz, right), and the right eye and left eye are displayed sequentially. Once again, high-speed LCD shutter glasses are used and synchronized with the projector via an IR emitter, blocking the right eye when left eye content is displayed, and vice versa.
The signal requirement is that you either need a high-speed dual link DVI cable to transmit 120Hz full HD signals to the projector from the source or two standard DVI/HDMI cables - one for the right eye content, one for the left eye content.
HDMI 1.4 looks to reduce this to a single cable. Due to the high speed of the 1920 x 1080 signal at 120Hz, extra care must be taken in cable bandwidth, connections, crimps and bending so as not to introduce bit errors.
There are several DLP two-piece consumer projection systems and flat-panel displays that advertise 3D capability, but they do so only at reduced resolutions. By reducing the resolution, the electronics and response times are greatly simplified. Most gaming flat panels are maximum 1680 x 1050, and many of the single-chip 3D projectors present a maximum of 1024 x 768 resolution.
There are a number of ways to create 3D with DLP systems. There are also numerous ways of generating 3D material, so the possible outcomes are limitless!