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Topic: Light efficiency of a 3D system
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 07-13-2017 09:06 AM
Color correction definitely goes into the efficiency. Dolby 3D (xenon based), I've found that the left eye, once fully corrected is the limiting factor and the right eye has to be reduced in lumen output to match by a significant amount (20%, typical).
But, the bottom line in computing efficiency is how much light went into the system versus how much came out. Dave provided an adequate procedure without having to actually know the lumen output of your system since you are only referencing to 2D as your "100%" benchmark (even though that isn't accurate either since you will have the 2D color correction in there too).
Note, with RGB laser and 6 primaries, the Dolby 3D is closer to 90% efficient on a dual projector system and closer to 40% on a single projector, 6 primary system. That is versus an 8-10% efficiency on a typical single projector xenon system.
Remember, with any single projector 3D system, you are throwing away 50% of your light while projecting the "other" eye. and since there is a transitional period (dark time) to switch between eyes, you are down to less than 50% BEFORE you start applying any filters (in projection or in eyewear). In dual projection, both eyes are active at all times.
Some cheat this by using a 4K imager and cut it in half so one eye is on the upper half and one is on the lower half (Sony). This solves the 50% loss problem BUT there has to be greater magnification to achieve the same image size, which reduces light.
So, I'd say the range is 8% to 90%, depending on the system and implementation. But, at the end of the day, it is still 3D so why bother?
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