Originally Posted by Stereodude
Wouldn't "x" be running through each of the colors on the wheel once per frame. So a 6x color wheel presents each segment of the wheel 6x per frame. In the case of the LED you could have 3 "segments" (R,G,B) each being presented 20+ times per frame.
I've been trying to learn more about the implications of LED light sources this afternoon.
I can understand a 4x
wheel being a six element wheel "RGB" "RGB" @ 2 revolutions per frame
if each "RGB" set is one "X" and each revolution per frame is one "X".
Two "RGB"s plus two revolutions per frame equals 4x, or one "RGB" plus one revolution per frame equals 2x.
I still don't have a handle on the more exotic combinations like these I've just found:
1. "6 segment 5x
Speed color wheel"
2. "seven-segment color wheel spinning at 6x
/ 10,800 rpm"
3. "8-segment, 5x
-speed color wheel"
Of course none of the examples I found listed the color of each segment on their wheel. Only a few listed the RPM of the wheel.
The best LED information I've been able to find is at Wikipedia.Rainbow Effect
"In some recent high-end models, the spinning color wheel and the white bulb have been replaced with a package containing super-bright LEDs in the three primary colors (red, green, and blue). Since LEDs can be switched on and off very quickly, ["Instant On/Off functionality" according to TI] this design allows even higher rates of sequential single-color image projection."
"The LED light packs now [I assume 2006] being introduced in DLP projectors may eliminate rainbow effect for all but a few very sensitive viewers
thanks to their high switching frequency and a complete lack of "black" segments as described above."
We seem to have at least two "very sensitive viewers" in this thread, but no definitive information about the 2006 HL-S5679 as to how many RGB cycles per frame that it's LED package can generate.
If I understand the Samsung engineer you spoke to, then he was saying that the 2007 LED light package can do 20 RGB cycles for each frame.
Maybe TI's demo package at the 2007 CES will be used in 2008 to do the other things the Wikipedia suggested.
"Additionally, the LED pack can display any color of light at any intensity, a capability which, if exploited
, provides the potential for increased color gamut and improved contrast compared to displays employing color wheels with fixed-color segments."