Originally Posted by AV_Integrated
That's still a bit confusing, but I think I get it...
The actual speed of the color wheel seems to be what matters. Keeping in mind 300hz is actually half that speed. (RGB/RGB color wheel) So, the wheel is spinning at 9000 RPM with 50hz material. 7,200 RPM with 60hz material. 5,760 with 24hz material? Okay. 3D is supposed to be 144hz. Someone explain all that to me.
Sigh - I still see some color separation (RBE) with the W1070, but it doesn't give me headaches or eye fatigue, so I'm quite happy.
And yeah, it is a bit confusing. The proper way for manufacturers to publish wheel speeds should actually be a table of multipliers (or even actual Revolution Rates) for each input refresh-rate (maybe an extra column on the supported input-resolution table?) - since as you say, that's what really matters.
Anyone watching Bluray will care about 24Hz. Many in, say, the US watching broadcast content will care about 60Hz; since that's common in broadcast. Likewise many watching broadcast content in the UK will care about 50Hz.
On the W1070, with an ear to the vent, you can actually hear the (very faint) whine of the wheel as its speed changes with rate; which is why I'm confident velconti's measurements are correct (or at least correct relative to each other).
It'd be nice if the 'rough' speeds were more consistent across differing rates; but in the case of the W1070, due to the the doubled-up color wheel (RGB/RGB), I can understand why the physical Revolution Rate might go down when input-refresh-rate is swapped up from 50Hz to 60Hz: but what I can't figure out is why 24Hz should be comparatively low (I ranted about this here
As for 3D - I'd be guessing: but my understanding is that triple-flash (144Hz) is only active on 24Hz input (ie, most 3D Blurays). To achieve this, I suspect they'd have to use a minimum of a 6x multiplier (24Hz * 6 = 144Hz); with half of those frames going to each eye in succession (L-R-L/R-L-R) to give each eye the same frame 3 times. If I listen to the wheel, though, it sounds like it's spinning at nearly-2D/50Hz levels in 3D/24Hz (or at least certainly higher than the 192Hz used for 2D/24Hz); so is it possible that the multiplier is 12 instead? (24Hz * 12 = 288Hz - which is just below the 300Hz that 2D/50Hz produces; so the motor can presumably handle it; and if the nett result is L-L-R-R-L-L/R-R-L-L-R-R; that'd still be the same frame repeated three times per eye, just with less RBE). Heck, perhaps the wheel is spinning at even a bit faster than this; with a few of those additional revolutions going towards blanking frames for red-flash sync with the glasses... Woah, now I'm off on a tangent! Pretty intriguing, though.
But yeah, as far as RBE goes: the W1070 compares favorably. And the complexity associated with specifying wheel speeds at differing input rates is probably why '6x' - which is high compared to the competition - does the trick on a spec sheet. (On the HT1075 Spec-Sheet
, they even explicitly specify '6X (50Hz
)' as the 'Color Wheel Speed').