Active vs. Passive 3D?
The first generation 3D TVs use active liquid crystal shutter glasses, which work by very quickly blocking each eye sequentially (typically 120 times per second) to separate the different right and left images required for 3D. As a result, the glasses (as well as the liquid-crystal lenses) require electronics and batteries that sync to the TV via an infrared (or sometimes RF) signal. In addition to being burdensome to wear, they’re expensive (They currently cost $60-$120 per pair) and prone to giving many people headaches or migraines.
In 2011 3D TVs that use passive polarized 3D glasses were introduced which use a technology called Film Pattern Retarder, developed by LG, where a polarizing film coating the TV screen allows each eye to view every other line. In addition to being much less expensive ($5 a pair), the 3D viewing experience is much better. Many argue that Active shutter glasses yield a higher resolution picture, I personally couldn’t tell a difference other than that I feel almost NO eye fatigue after viewing hours of passive 3D which is definitely not the case with active.
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