Sunday, March 29, 2020




Technical Support

Virus Prevention
and Detection

Spyware Prevention
and Detection

Personal Computer
Support Contract

Domains by Landmark

Web Sites by Landmark

Remote Support by Landmark

Adventures of Landmark Lad


About Us

Elevator Speech

Privacy Policy

Contact Us

About this site

Welcome to the Landmark Web, your guide to the issues surrounding personal computing and effective use of your own PC. We've made many resources available here: from broad-based news and views about the computing industry to specific technical support for you and your computer. So dig in and learn more about your computer and the Internet with Landmark as your guide.

Tell a friend about this page!

Landmark Computer Labs wants everyone to know about the useful information we provide to clients and friends.

We use this address only to tell the recipient who sent the message. We do not save or re-use it in any way.
Click here for this site's
Privacy Policy.

Thin black line on monitor

What is the thin black horizontal line on my monitor?

The thin black horizontal line visible about two-thirds of the way down some 17" and larger CRT displays is a restraining wire characteristic of some Trinitron screens. Most PC monitors use "shadow mask" grills with tri-dots through which the colored phosphors emit their light. (This is where "dot pitch" comes from: a measure of the proximity of these dots.) Trinitron monitors use a vertical wire grill instead. The proximity of the wires to each other is the "strip pitch". This technology produces a conical screen shape, which appears flatter to the eye than does the spherical shape typical of shadow mask monitors. The cost of this screen flatness is, however, the visible restraint wire. In practice, it is usually only noticeable against a white background.

The KDS monitors that we sell use Trinitron tubes, and thus have the thin black line.

thin-black-line.shtml     |     Updated Wednesday, November 8, 2006
Landmark Computer Labs, Domains by Landmark, and Landmark Ameritech are registered trade names of Landmark Computer Laboratories, Inc.
Copyright © 1981-2017 Landmark Computer Laboratories, Inc.     |     Privacy Policy     |     Contact Us