What is the imaging principle of liquid crystal display?
1, liquid crystal display (LCD/Liquid Crystal Display) imaging principle, is to place liquid crystal between two conductive glass, driven by the electric field between the two electrodes, the liquid crystal molecules to distort the electric field effect of columns, in order to control the light transmission or shadowing function, the switch in power between the shade and image is displayed. If coupled with the color filter, it can display a color image.In 2, with two pieces of glass substrate alignment film, liquid crystal alignment along the groove so that the glass substrate with 90 degree deviation due to the film groove, so the liquid crystal molecules become reverse type, when the glass substrate without electric field, the light through the polarizer with LCD 90 degree twist, the lower polarizing plate, liquid crystal the display panel white; when the glass substrate is the electric field, the liquid crystal molecules to produce alignment changes, light through the liquid crystal molecular gap to maintain the original direction is below the polarizing plate shielding light is absorbed, not revealing, LCD panel display black. Liquid crystal display is based on this voltage, so that the panel to achieve the display effect.Basic introduction:A liquid crystal display (LCD) is a flat, ultra thin display device consisting of a certain number of color or black and white pixels, placed in front of the light source or reflector. Liquid crystal display power consumption is very low, so it is favored by engineers, applicable to the use of battery electronic equipment. Its main principle is to stimulate the liquid crystal molecules with electric current to produce dots, lines and planes, and match the back lamp tube to form a picture.
Starting with the luminescent mechanism of LCD (liquid crystal display), the traditional CRT (cathode ray tube) is struck by a high-speed ray of an electron gun on a phosphor screen, and the phosphor is hit by a high-speed impact. The LCD panel itself does not emit light, and a 15 inch LCD screen consists of millions of tiny liquid crystal units, commonly known as dots". The liquid crystal becomes transparent after being electrified, and then is imaged by a tube built behind the LCD panel, which is known as passive luminescence".
Liquid crystal is a kind of special substance between liquid and solid, it has liquid flow property and solid optical property. When the liquid crystal is affected by the voltage, it changes its physical properties and deforms. At this point, the color of the light changes with the angle of its light to produce color.There is a backlit LCD screen behind the light through the first layer of polarizing plate, liquid crystal to come on, and when the light through the LCD, will produce light color change from the light from the liquid crystal, must go through a color filter and second polarizing plates. Since the polarization of the two polarizing plates is 90 degrees, coupled with changes in voltage and other devices, the LCD displays the color we want.Liquid crystal display has active and passive two, in fact, these two imaging principles are similar, but the design and direction of the backlight and polarizer are different. The active liquid crystal displays also use FET field effect transistors and common electrodes, which allows the liquid crystal to remain potential until the next voltage changes. In this way, active LCDs do not produce ghost or image delay defects that are common in passive lcds. The active type liquid crystal screen is now the most popular TFT (Thin Film Transistor thin film transistor), passive LCD screen STN (Super TN super twisted nematic (Double LCD) and DSTN layer Super TN double super twisted nematic LCD) etc..
