Originally Posted by NorthSky
With 3D passive (2K); do you have to sit eye-level (horizontally and vertically) with the display, and also not too close to the screen as to not see the artifacts? ...Vertical banding (black vertical moving bars), or whatever it is called.
Passive 3D at a public cinema uses different technology that does not produce the artefacts produced by Film-type Patterned Retarder passive home displays.
Passive 3D on a home display if the display is only Full HD will involve a Film-type Patterned Retarder (FPR) that halves the number of vertical pixels that are visible for each eye. At reasonably close viewing distances you perceive a fine pattern of black horizontal lines, like Venetian blinds; and there are aliasing effects, e.g. a diagonal line can appear to have small jagged steps. I find that even at a greater viewing distance I perceive aliasing even if I can no longer see the individual black horizontal lines. If you are a reasonably non-critical viewer, 3D with a passive Full HD is not too bad. It is bright, and it doesn't flicker. Some people report finding it less tiring to watch than 120Hz active glasses technology.
The vertical viewing angle is very
critical. You get minimal ghosting if you are at the correct vertical viewing angle and horrible ghosting if you stray too much from that angle. The horizontal angle is not particularly important as regards ghosting but may affect the picture quality in other ways (LCD displays). Passive can be a particular benefit in Europe and Australia with a 50Hz television frame rate as active glasses usually operate at only 100Hz with a 50Hz picture, which can lead to noticeable miraging for a certain percentage of viewers (such as me!).
A 4k passive panel is currently a very good solution* for viewing Full HD 3D if viewers are prepared to view at the optimum vertical viewing angle. With my 65" Sony 4k LCD TV I do not notice aliasing or black lines unless I get extremely close to the screen. Ghosting is low (though not as good as with DLP projectors and active glasses), and there is no timing discrepancy between displaying the Left and Right views.
* I am assuming the passive 4K TV uses a fine pitch for the film-type patterned retarder resulting in 1080 horizontal lines for Left and interspersed 1080 horizontal lines for Right. (An exception is the 2013 model 55" Sony 4K set which uses a coarser FPR pitch.)