May 9th, 2008 Art Feierman
OK, time to pick up where I left off. We’ve already discussed a bit about 3LCD’s strengths in terms of more color per lumen, and in color accuracy at full power. There are, however other issues which came up in our discussions. One of those was the cost of maintenance.The guys on the other side of the isle – those DLP proponents at Texas Instruments, claim a big advantage in terms of cost of maintenance. So, let’s investigate. This isn’t about reliability, but about routine maintenance. The DLP folks point out that that most DLP projectors do not require dust filters, because DLP projectors use a sealed light path. 3LCD projectors require filters, and therefore, frequent changing of them, because dust can be a problem, and can even mar the image with what are called (aptly) dust blobs.
The 3LCD folks counter, that many of today’s 3LCD projectors don’t need filters cleaned any more frequently than they need lamp changing. If that were the case, they would have a strong case. As I said to the 3LCD folks, hey, you don’t have to be better at everything. I said that, because I do think DLP has the advantage here.There are basically two scenarios. Projectors that are placed on a table top, and those that are permanently mounted. Since cleaning or replacing a filter is a very quick thing, if you have easy access to the projector, using your projector on a table top, negates any real advantage of projectors that don’t need filters changed frequently. Ceiling mounting is a whole different story. Often, accessing a ceiling mounting projector requires at least a ladder. And it can be a real challenge if you have really high ceilings. In some commercial applications, reaching the projector can be daunting, consider many church sanctuaries, where the projector could be 50 feet up in the air, or perhaps a small auditorium, large multipurpose room, or hotel ballroom. not only a pain, but expensive timewise, especially if you contract out, or have a support department run as a profit center. Read the rest of this entry »