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Originally Posted by jmurphy
It also says there: "E Ink 1.3” displays"
Polarizers have been used with LCDs, but they aren't restricted to LCDs.
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LCDs don't work at all without polarisers, but they are linear polarisers, because the liquid crystals are rod like and thus the light passing the cell (reflected or backlight) has to be polarised. The changing polarisation angle of the pixel vs the light makes it darker or clearer. I can't think why eink googles would use circular polarisers. The eink can't use backlights, only a front illumination. Polarisation would be irrelevant.
Left and right circular polarised (one for each eye) is only used in displays with passive glasses viewing a separate cinema screen. The stereoscopic TVs work best using double frame rate and active LCD shutter glasses, one eye then the other. This works for more people. The passive so-called 3D glasses (red & green from 1950s) or polarised are also simply stereoscopic, not 3D. Real animated 3D video displays are very small and specialised and not 3D like a real view or a hologram, but unlike fake stereoscopic 3D you can move your head and look around things and have true depth. Some stereoscopic goggles track eye and head movement and redraw the computer generated scene to give a real 3D illusion. Pre-recorded video is only flat stereoscopic.
Any display other than an LCD rarely has a polariser, unless it part of some privacy system.