How the LCD display technology works?
Blaze Display Technology Co., Ltd. | Updated: Nov 27, 2018
A Liquid crystal display is a passive device, which means it doesn't produce any light to display characters, images, video and animations. But it simply alters the light traveling through it. The internal construction of LCD describes how the light altered when it passes through it in order to produce any characters, images etc.
LCD display technology.
LCD screens are an array of small segments called pixels, which can be manipulated for information displaying. Such displays have several layers, where two panels, made of glass material free of sodium and called substrate, play a crucial role. The substrate contains a thin layer of liquid crystals between them. The panels have flutes that direct the crystals, giving them a distinctive orientation. Flutes are parallel on each panel but are perpendicular between the two of them. Longitudinal flutes are obtained as a result of placing on the glass surface thin films of transparent plastic, which are then processed in a particular way. In contact with the flutes, the molecules are oriented identically in all the cells. The liquid crystal panel is illuminated by a light source, depending on where it is located, as the LCD panels operate on reflection or light transmission. The plane of polarization of the light beam is rotated by 90° as one panel passes. When an electric field appears, the molecules are partially aligned along it, and the angle of rotation of the plane of polarization of light becomes different from 90°. By producing screens using LCD monitor technology, the backlight of the monitor is used to output a color image so that light is generated at the back of the LCD monitors. It is necessary to be able to have a picture with good quality, even if it is dark. The color is obtained using three filters, which distinguish three principal components from the radiation of a white light source. By combining the three primary colors for each pixel of the screen, you can reproduce any color.
LCD technology comparison: then-and-now.
Modern LCD screens are also called flat panels, dual scan active matrix, and thin-film transistors. Now they are extremely popular - everyone likes their elegant look, thinness, compactness, and efficiency. LCD monitors provide a quality contrast, and bright, clear images. In the past, liquid crystal technology was slow, not as efficient as now, and their contrast level was low. The first matrix technologies, the so-called passive matrices, worked quite well with textual information, but with a sharp change in the picture, so-called “ghosts” appeared on the screen. Since LCD technology orients each pixel separately, the clarity of the received text is higher in comparison with CRT monitors, which in the past could compete with LCD ones.
Now LCD has a wide range of uses, including LCD TVs, computer monitors, dashboards, aircraft cockpit displays, and indoor and outdoor signage. Small LCD screens are common in LCD projectors and portable consumer devices, such as digital cameras, watches, digital clocks, calculators, and mobile phones including smart phones. LCD screens are also used in consumer electronics products such as DVD players, video game equipment and clocks.
