Quote:Originally Posted by freychris42424
Something else that was odd for me is that I do see rainbows on the BenQ, although for most media they are not super distracting. I used to own an X1 a looong time ago, about 10 years ago, and never saw them with a 2x color wheel. It probably has to do with the fact that Benq is brigher than the X1 but that was something else I was a little disappointed about.
Brightness is definately part of the reason - but here's the other reason: the color wheel speed (fast as the claimed 6x sounds) isn't constant across framerates (just like with the W1070): see here
To get full wheel speed (and hence minimize rainbows), you need to be running at 50Hz; at which you get a very-fast 300Hz Effective Wheel Spin-Rate.
60Hz is a bit worse (at a 240Hz Effective Spin-Rate); and 24Hz is actually pretty-much average (at just a 192Hz Effective Spin-Rate).
For this reason I run mine at 50Hz consistently and see no rainbows (I'm very sensitive).
The real question is why on earth BenQ has decided not to keep a roughly-the-same color wheel spin-rate throughout framerates.
(Begin Lots Of Math)
We know it's a double-RGB wheel (RGBRGB) so one physical revolution is an effective 2x. We also know that a minimum of one full physical revolution is required per input frame; which means our increments are going to be 2x. So perhaps that would sort-of explain the drop from 50Hz to 60Hz - so:
50Hz Input Framerate x 3 Revolutions x 2 Effective = 300Hz Effective (ie 150Hz Physical Spin-Rate)
60Hz Input Framerate x 3 Revolutions x 2 Effective = 'Hypothetical' 360Hz Effective (ie 180Hz 'Hypothetical' Physical Spin-Rate)
...perhaps 180hz (which is 10800 revolutions per minute) is beyond the motor's capability or hurts color fidelity or produces too much noise or etc etc etc; so the next lower color wheel multiplier is 2 Revolutions (instead of 3); giving us:
60Hz Input Framerate x 2 Revolutions x 2 Effective = 240Hz Effective (ie 120Hz Physical Spin-Rate).
...which was found to be the case.
Fine; maybe that explains the drop from 50Hz input framerate to 60Hz. Sort-of.
But then why did BenQ decide to run 24Hz input signals (the default for most Bluray players) at just 192Hz Effective (ie 96Hz Physical Spin-Rate)?
At 24Hz, the projector does this:
24Hz Input Framerate x 4 Revolutions x 2 Effective = 192Hz Effective (ie 96Hz Physical Spin-Rate).
That's a far cry from the 300Hz Effective that it does at 50Hz.
They could've simply used a multiplier of 6 Revolutions Per Input-Frame to nearly-match RBE performance of 50Hz - ie:
24Hz Input Framerate x 6 Revolutions x 2 Effective = 288Hz Effective (ie 144Hz Physical Spin-Rate).
...which is just marginally lower than the Effective 300Hz we get with a 50Hz input signal; and would've been fast enough to eradicate most rainbows.
But instead they didn't: and therefore at the most common output frame-rate of HD sources (24hz), they've provided the slowest wheel spin-speed. It boggles my mind.
(End Lots Of Math)
Still, I absolutely love my W1070 and wouldn't swap it for anything else (and 192Hz effective is still considered very respectable); but I continue to find this decision to be rather silly.
TL;DR: In terms of your Xbox One, you're probably getting 60Hz out of it, right? Does it offer anywhere to drop to 50Hz? If so, try dropping it and you should see a noticeable improvement in terms of rainbows