Broadcast television comes to your home with a maximum resolution of 330 lines. DV VCRs make up to 500 lines of horizontal resolution. Computer users are more familiar with measuring resolution in terms of pixels. In the video world, resolution is measured in lines. The difference in the ways these numbers are calculated make it difficult to convert from one to the other directly.
Multiscan monitors used for computer and video display often list their resolution both ways.
In all cases, the higher the resolution the better. The smaller the dot pitch the better since it allows for more potential dots to be displayed giving you more resolution. In order to remain sharp, small TV screens require a smaller dot pitch than large screens. Better monitors would have a pitch of .31mm or as small as .25mm. The monitor must separate the two.