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Discussion Starter · #1 ·
This article:
http://www.projectorcentral.com/news...fm?news_id=302


describes new developments on the DLP front. It seems that DLP single-chip technology is in for a major overhaul, with new color wheel design and new micro-mirror modulation techniques.


Key excerpts:


In a paper entitled "Sequential Color Recapture and Dynamic Filtering: A Method of Scrolling Color" authored by D. Scott Dewald, Steven M. Penn and Michael Davis of Texas Instruments, an innovative approach to increasing the efficiency of a single modulator display is described.


"The current DLP single-panel technology has only one color present on the surface of the DMD, meaning that, at any one time, one third of the light is used while two thirds of the light is wasted," said Scott Dewald of TI's DLPTM Products division, who delivered the paper at the conference. "Sequential Color Recapture - SCR - is a technology that allows all three colors to be present simultaneously, such that a single panel DLP system can now be as efficient as - potentially more efficient than - a three panel system, but without the additional parts, size, weight and expense of three panel systems."


"Although many solutions have been proposed to the challenge of maximizing the efficiency of single modulator displays," he continued, "all have exhibited a high degree of mechanical complexity which would make manufacturability a real issue. One of the key virtues of SCR is its simplicity: it is no more complex than what we have today, requiring no additional moving parts."


The implementation of SCR technology requires a change to the color wheel and light integrating element currently employed in single-DMD DLPTM subsystems, together with changes in the DMD and the drive electronics. The optical capability of SCR has been made possible by advances in dichroic and metal thin-film technologies, the most important of these being the photolithographic patterning of dichroic coatings. The SCR color wheel is created from RGB dichroic coatings arranged in a "spiral of Archimedes" pattern.


With the R,G,and B colors now arranged in a spiral pattern rather than pie-wedges (I'm assuming current DLP's use a pie-wedge color arrangement ?), coupled with higher mirror modulation rates and higher color wheel speed, it looks like rainbow artifacts could be a thing of the past.


If we knew the SCR wheel speed (RPM), and the exact color geometry on the new spiral wheel, we might compute an equivalent "CRT refresh rate".


 

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Discussion Starter · #4 ·
It seems that in the front projector arena, we are on the verge of so many breakthroughs, all "3-5 years out": LED light sources, laser light sources, SRC color wheels and modulation, lower cost LCOS, GLV, higher res imaging devices, etc...


Enough to scare off many new entrants to the hobby!


(But at least we have a lot of upgrade paths to choose from http://www.avsforum.com/ubb/smile.gif )
 
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