liquid crystal display

(redirected from LCD monitors)
Also found in: Dictionary, Thesaurus, Medical.

liquid crystal display

[′lik·wəd ′krist·əl di′splā]
(electronics)
A digital display that consists of two sheets of glass separated by a sealed-in, normally transparent, liquid crystal material; the outer surface of each glass sheet has a transparent conductive coating such as tin oxide or indium oxide, with the viewing-side coating etched into character-forming segments that have leads going to the edges of the display; a voltage applied between front and back electrode coatings disrupts the orderly arrangement of the molecules, darkening the liquid enough to form visible characters even though no light is generated. Abbreviated LCD.

liquid crystal display

(hardware)
(LCD) An electro-optical device used to display digits, characters or images, commonly used in digital watches, calculators, and portable computers.

The heart of the liquid crystal display is a piece of liquid crystal material placed between a pair of transparent electrodes. The liquid crystal changes the phase of the light passing through it and this phase change can be controlled by the voltage applied between the electrodes. If such a unit is placed between a pair of plane polariser plates then light can pass through it only if the correct voltage is applied. Liquid crystal displays are formed by integrating a number of such cells, or more usually, by using a single liquid crystal plate and a pattern of electrodes.

The simplest kind of liquid crystal displays, those used in digital watches and calculators, contain a common electrode plane covering one side and a pattern of electrodes on the other. These electrodes can be individually controlled to produce the appropriate display. Computer displays, however, require far too many pixels (typically between 50,000 and several millions) to make this scheme, in particular its wiring, feasible. The electrodes are therefore replaced by a number of row electrodes on one side and column electrodes on the other. By applying voltage to one row and several columns the pixels at the intersections are set.

The pixels being set one row after the other, in passive matrix displays the number of rows is limited by the ratio of the setting and fading times. In the setup described above (known as "twisted nematic") the number of rows is limited to about 20. Using an alternative "supertwisted nematic" setup VGA quality displays (480 rows) can be easily built. As of 1995 most notebook computers used this technique.

Fading can be slowed by putting an active element, such as a transistor, on the top of each pixel. This "remembers" the setting of that pixel. These active matrix displays are of much better quality (as good as CRTs) but are much more expensive than the passive matrix displays.

LCDs are slimmer, lighter and consume less power than the previous dominant display type, the cathode ray tube, hence their importance for portable computers.
References in periodicals archive ?
The highly integrated gm5020 image processor offers numerous integration features -- including High-Bandwidth Digital Content Protection (HDCP) and "Ultra-Reliable DVI" -- to provide a flexible, cost-effective solution for the rapidly growing market of LCD monitors with both analog and digital interfaces.
DisplaySearch's Quarterly Supply Vs Demand Study: LCD Monitors is actually 4 reports in one.
They are constructed of solid-steel and will fit most brands of LCD monitors, 13- to 23-inches.
Genesis Microchip (Nasdaq: GNSS) introduced the gm5020 LCD monitor controller, the most highly integrated chip the company has ever produced.
The database includes specifications for nearly 195 LCD monitor modules and 500 LCD monitors and pricing on over 200 LCD monitors.
CHICAGO -- NEC Display Solutions of America, the leading stand-alone provider of flat panel desktop displays, today announced two TAA, trade-compliant AccuSync LCD monitors.
If it is combined with the purchase of DisplaySearch's Quarterly Supply Vs Demand Study: LCD Monitors which provides aggregate data on North American LCD monitor shipments through all channels and forecasts the worldwide LCD monitor market on a rolling 8-quarter basis, it is discounted by $1,000 for a limited time.
New products under consideration include dual LCD monitors offered at several price points, a triple and quad multi-screen LCD solution and touch screen LCD monitor solutions.
x" LCD monitors accounted for 56% of shipments on a unit basis with NEC's 20" product accounting for the second highest number of shipments.
SOYO and the SOYO branded GoVideo dual LCD monitor line incorporates TFT (Thin Film Transistor) display technology in a dual monitor stand, with a wide-angle flat screen that offers a view of the screen from various angles without compromising image quality.
According to Ross Young, President of DisplaySearch, "This quarter's LCD Monitor Pricing and Specification Database provides detailed specifications, pricing and production allotments on 91 TFT and STN LCD monitors and 61 TFT and STN LCD modules.
Demand for 3D LCD monitors able to manipulate images in real-time is growing, particularly in medical, photogrammetry, geospatial intelligence and image exploitation applications," said Rhoda Alexander, director of monitor research at iSuppli.