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Where can I read about this "hardware"? My understanding was that it was simply TV's with better color clarity and then marketing fluff. I've never heard about this "hardware".

Edit: Here's a decent resource. Still doesn't talk about a hardware chip but rather about multiple LCD screens or blacking glasses that are synced with the TV. Both options sound rather expensive.

http://www.3dtvguide.org/3d-tv-technology.html

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OLED is fundamentally different than LCD for 3D purposes. OLED can near-instantaneously flip between the left/right eye views, so your perception in each eye is a clear image. LCD's refresh rate is much slower by comparison, leading to each eye getting a more blurry image.

Active 3D required an emitter that synced glasses to the TV's output, and the glasses themselves.

I assume passive 3D required some hardware to support it too, and both required hardware with firmware that could support the formats and settings required

It requires a polarizing filter/film that's aligned with the screens dot matrix.

In theory that could also be added as aftermarket modification.

If the screen is fed with an interlaced 3d stream and the screen firmware/hardware allows 1:1 pixel playback it doesn't need to know if the content is 3d or not.

https://www.youtube.com/watch?v=2kg-dFSE2IY

I was aware of passive 3D being done with aftermarket filters (mostly as a joke, printed on laminate), but proper consumer 3D had to support the same formats that Active 3D did, which usually meant side-by-side and top-bottom