Originally Posted by r1dude57
How do the newer DLP sets handle overscan, and are they capable of dot by dot mode?
As you may know, overscan began with CRTs to avoid any "borders" around the picture, and broadcasters began to use that "extra" space in the picture for other data, so it continues to this day. As a computer monitor however, this is very annoying as it chops off some of the task bar, and icons can appear to be partially offscreen.
To further complicate things, the image is projected at an angle, so a rectangle would tend to appear trapezoidal. They engineer the optics to redirect the image in such a way as to counter these optical effects, but because of this and the broadcasting data, there is typically 2 to 2-1/2% of overscan built into the sets, which is considered quite good. DLP sets can also electronically adjust the picture to eliminate any of these geometry issues, by remapping pixels to other locations.
This works so well that typically, there is some geometry correction applied at the factory. While this is not an issue with TV viewing and is arguably a good thing, it can appear to sometimes soften fonts if using the TV as a computer screen, especially as the pixels are over 22 times larger on a 73" screen vs a typical laptop. TVs weren't really intended to be computer monitors, but maybe 4k2k displays will solve this issue as well.
To answer your question though, geometry correction can be easily diabled, returning the set to 1 to 1 pixel mapping (dot to dot). In fact the set disables geometry correction automatically in 3D mode, as the DLP checkerboard 3D format requires exact pixel to pixel control.
To answer your other question, overscan cannot be eliminated. However, what I've seen most people are doing is using their video card to slightly resize the desktop image so it fits edge to edge, disabling geometry control only if it appears to soften fonts, then returning to full scale if they watch programming through their computer as well. I don't use my TV as a monitor, but there are numerous posts describing the process in detail.
I hope this helped.