Display devices convey information in visible form from electronic devices to be viewable to individuals. Common examples are the picture tubes in televisions and computer our monitors. Until recently, the most versatile of these has been the picture tube. A good example of this is the television. While picture tubes set a very high standard of performance and provide bright color images, they are bulky, heavy, and expensive. Today, most people are trying to get rid of them because they take up so much space.
The developments of the flat-panel displays enhanced the display of televisions and monitors. Such displays are advanced versions of the liquid crystal display familiar in digital watch faces. They are two parallel sheets of thin glass having the facing sides coated with a transparent yet electrically conducting film such as indium tin oxide. The film layer nearer the viewer is patterned, while the other layer is not. The space between the films is filled with a fluid with unusual electrical and optical properties, so that, if an electrical field is established between the two thin films, the molecules of the fluid line up in such a way that the light-reflecting or light-transmitting properties of the assembly are radically changed. The electro-optical fluid is an electrical insulator, so very little electric current flows. almost no power is consumed, this makes the display well suited for use in battery-powered applications. All flat-panel displays have these characteristics in common, but the many different varieties exploit the electro-optical effects in many ways.
Displays that produce images are patterned with thousands of tiny picture elements that can be electrically activated independently to produce patterns of light and dark or arbitrary forms. Superposed colour filters having arrays of elements corresponding to those in the display permit the formation of colour images of a quality rivaling that of color cathode-ray tube displays. Such displays are used as viewing devices for television sets, computers, and video and digital cameras.
Color displays capable of serving as television screens or computer displays are available in sizes of more than 35 cm (15 inches) on the diagonal, at costs nearly competitive with picture tubes. Theses are in high demand for them in laptop computers, where the thinness of a flat-panel display is essential. The control electronics is integrated into the display, for otherwise the number of individual wires needed to connect with the rest of the circuitry would be prohibitive.
A great amount of effort is being expended to increase the size and decrease the cost of flat-panel displays, because the potential market for them is clearly substantial. Much of the reduction in cost is obtained through experience in manufacturing, where low yields attributable to defects in the patterns have been a major pro
Nearly all of the computers and televisions use the newest technology. Our watches, tablets, laptops and computer monitors use this today because o