Originally Posted by HiFiFun
It's seems intuitively obvious that single chip DLP can use a single white source keep the color wheel (starting with the LED driven pico projector revolution), or use RGB LED sources and eliminate the color wheel.
One reason no DLP LED projector have used just white LED yet (except pico projectors) is because one benefit one chip DLP PJ manufacturers always wanted to find a solution to is to avoid the color wheel.
Another reason to not use White LED only is that they still don't have high enough Color Rendering Index (CRI), these Luminus White LED's have only a CRI of 70. But it is rumoured that some LED producers now are close to reaching CRI of 90.
RGB+White LED is the equivalent to a DLP projector with a white segment in the color wheel = presentation projector.
Still too weak in RGB power compared to laser.
Lightloss by polarization in laser (when exempt the 3D part) is a non issue as laser can be had both as non-polar and semi-polar orientations and use a mix of those.
One solution for Despeckling laser light is to use several smaller lasers for each color with different polarization.
Lasers are also not so sensitive to ambient temperatures to keep color consistency as LED's.
Luminus is the sole deliverer of LED for projectors that are powerful enough for HT PJ's, while there is many Laser manufacturer (those that grow the crystal) and those that manufacturer laser packages.
LED for projectors have been available for many years, but there must be a reason so few PJ manufacturers have used them.
Have they been waiting for Laser quality developments?
Or are there other reasons?
Here is a overview of laser development and future marked predictions from 2010 (mostly focused on the Pico marked, but it's basically the same tech just scaled up for HT PJ); Green laser diode market $500m by 2016 as pico-projector market drives growth
I believe that as soon as the despeckling are perfected, new light engine and optics designs for Laser PJ's are developed and laser prices comes down a little, both lamps and Led's will disappear from the projector marked just because lasers are both simpler and more power scalable than other light source solutions.