Facts And Information
What Is A modern monitor?
On two-dimensional display devices such as computer monitors the display size or viewable image size is the actual amount of screen space that is available to display a Picture, video or working space, without obstruction from the case or other aspects of the unit's design. The main measurements for display devices are: width, height, total area and the diagonal.
The first computer display devices were modified typewriters and Teletype machines. These devices were slow, noisy, and expensive, and could only handle text. For graphic output, an X-Y plotter, a device that pulled a pen over a piece of paper, was used. It shared all the problems of the Teletype machine.
It did not take long before these mechanical machines were replaced with electronic counterparts. The replacement was called a terminal. It consisted of a typewriter-like keyboard, which activated switches, and a display screen, which was a modified television receiver. Thus, the first computer display device was a cathode ray tube or CRT.