Thread: How LCD 3D Glasses Work

LCD 3D glasses use a different technology altogether. The lenses actually darken and lighten in sync with the refresh rate of the image on the screen. A polarizing filter works in conjunction with the liquid crystal to make this happen. An IR emitter tells the glasses when to perform this change. As the glasses are performing this function, they are essentially hiding a piece of the image from your eyes even while it's on the screen. This creates the 3D illusion. Though it is still just a way to trick your mind into seeing something that isn't there, the LCD glasses produce a much higher quality image than the 3D glasses of old.

In addition to your quote above i like to share this...
In the old days, 3D was done by presenting half the image in blue, and half the image in red. Users would wear red and blue glasses, which would prevent each eye from seeing the other half of the image. The result was a fairly convincing 3D image, but left a lot to be desired when it came to picture quality.

LCD 3D glasses use a different technology altogether. The lenses actually darken and lighten in sync with the refresh rate of the image on the screen. A polarizing filter works in conjunction with the liquid crystal to make this happen. An IR emitter tells the glasses when to perform this change. As the glasses are performing this function, they are essentially hiding a piece of the image from your eyes even while it's on the screen. This creates the 3D illusion. Though it is still just a way to trick your mind into seeing something that isn't there, the LCD glasses produce a much higher quality image than the 3D glasses of old.