Originally Posted by CaspianM
That is not true. Digital pj's have uniformity issues too but it varies.
Did I mention mis-convergence!
Originally Posted by Zues
Does that mean convergence is better on a crt?
It CAN be.
CRT triple gun convergence can be dialed in like nobody's business. Triple chip fixed pixel, which started with LCD, has to be very carefully converged at the factory and then fixed in stone, and is not always done right. As the owner, you cannot change that. It has to be done by a tech, who has to go in and mechanically realign them.
I saw some Runco DLP pjs at CES that were very badly converged, much more so than I would ever allow in my CRT calibrations. Most fixed pixel QC allows for the triple chip images to be one pixel off. These were 2-3 pixels off, and were really noticeable when you were not all that far back from the screen. To not see them you had to be a lot farther back than you want to be, on that fine an image. But when I mentioned it, they just shrugged it off and said they were all like that. Not quite what I had expected Runco to say...
The early single chip DLPs had massive convergence error, but it was only out at the edges. The inside areas were fine, but the refraction of the inferior optics on those early designs caused what LOOKED like convergence error the farther away you were from center. And they were not owner/alignable, like the crosshairs are on CRT triple gun tech.
And this was on single-chip tech, with color wheel! No triple chip alignment challenges, and yet there still had error that looked like convergence error.
The triple chip monsters of that time period could be aligned right and had superior optics, but again that was not doable by the consumer.
In later years the refraction error in those early DLPs was markedly remedied by using multiple mirrors and thus lengthening the throw distance on the fixed pixel RPTVs. And using better lenses.