Lewis, I am looking a few years into the future.
For displaying of the 48fps 3D movies currently in production, at home using a new home plasma TV set standard, I would not underestimate the challenges of raising the alternation rate of domestic shutter glasses for plasma displays. There could be an increase required from the usual 120Hz, to the 144Hz currently used in the cinema for 3D 24fps film (RealD), and on up to the more desirable 288Hz. By 288Hz I do not mean timing fineness in the duty cycle relating to blanking. I mean the following patterns of actual
Left and Right alternations:
- Each 24fps frame would be shown as: L1R1 L2R2 L3R3 L4R4 L5R5 L6R6, i.e. 6 flashes of Left interspersed with 6 flashes of Right
- Each 48fps frame would be shown as: L1R1 L2R2 L3R3, i.e. 3 flashes of Left interspersed with 3 flashes of Right
To execute these patterns successfully with low ghosting might require precision in blanking times corresponding to 1153Hz. (In detail: using a duty cycle of 75% "on" time and 25% "blanking" time.)
The above is well beyond the capacity of current domestic plasma screens while maintaining fineness in levels of brightness and colour. However with passive LCD displays it would be quite feasible to display 48fps 3D material using current domestic screen technology
with minor alterations to timings.
If manufacturers could make plasma 3D sets work successfully at a 144Hz true alternation rate that would be a good start, but it is very challenging without losing brightness and without increased stereoscopic cross-talk. Unfortunately, plasma screen technology is ill-suited to high frame rate 3D.
P.S. Projectors for passive glasses can use a single light engine with an alternating polarizer; or two light engines with a fixed polarizer for Left and complementary fixed polarizer for Right.
EDIT: On the main topic of this thread, logic suggests to me half top-bottom rather than half side-by side; given that passive displays can take full advantage of horizontal detail in the source, but are already compromised in what can be displayed accurately in the vertical direction. However it should not be difficult to create two test clips and run them sequentially with software or a display that automatically switches between half top-bottom and half side-by-side.Edited by MLXXX - 7/16/12 at 6:09pm