Putting color into monochrome displays.A device that uses liquid crystals as a gate to control the passage of light can now convert the yellow glow of a cathoderay tube into various shades of Noun 1. shades of - something that reminds you of someone or something; "aren't there shades of 1948 here?" reminder - an experience that causes you to remember something color. This shutter (1) An opaque window that is moved in one direction to let light in and in another to close off the light. In fixed-lens cameras, one shutter often suffices for aperture and speed. , developer by Tektronix, Inc., of Beaverton, Ore., allows alternating bursts of red and green light (the components of yellow light) to paint brightly colored images over a screen that would normally show only a single color. The shutter consists of several polarizing filters and a liquid-crystal cell, which form a sandwich that can be placed in front of a cathode-ray tube. Electrical signals sent to the liquid-crystal cell rotate the liquid-crystal molecules so that green and red light get through at different times. If the switching rate is fast enough, the human eye mixes the colors to produce a colored image. A special circuit board coordinates the liquid-crystal activity with output from a computer. Although this system doesn't provide all the colors offered by a conventional color television, it offers a much sharper picture. Word processing word processing, use of a computer program or a dedicated hardware and software package to write, edit, format, and print a document. Text is most commonly entered using a keyboard similar to a typewriter's, although handwritten input (see pen-based computer) and , for example, can't be done very well on a color monitor See monitor. becuase small letters are too fuzzy. With a liquie-crystal shutter, a monochrome Also called "mono." Refers to display screens that use one foreground and one background color; for example, black on white, white on black or green on black. The first terminals connected to mainframes and minicomputers were monochrome, and monochrome screens were widely used on early display retains its original clarity while color is available to highlight passages or to label charts. |
|
||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion