Test Specification of LCD Display

Test Specification of LCD Display

    LCD Display, full name of Liquid Crystal Display, is a flat display technology. It mainly uses liquid crystal materials to control the transmission and blocking of light, so as to achieve the display of images. The structure of the LCD usually includes two parallel glass substrates, with a liquid crystal box in the middle, and the polarized light of each pixel is controlled by the rotation direction of the liquid crystal molecules through the voltage, so as to achieve the purpose of imaging. LCD displays are widely used in TV, computer monitors, mobile phones, tablet computers and other devices.

    At present, the common liquid crystal display devices are Twisted Nematic (TN), Super Twisted Nematic (Super Twisted Nematic), STN), DSTN(Double layer TN) and color Thin Film Transistors (TFT). The first three kinds of manufacturing basic principles are the same, become passive matrix liquid crystal, and TFT is more complex, because of the retention of memory, and called active matrix liquid crystal.

    Due to liquid crystal display has the advantages of small space, thin panel thickness, light weight, flat right-angle display, low power consumption, no electromagnetic radiation, no thermal radiation, it gradually replaces the traditional CRT image tube monitor.

LCD displays basically have four display modes: reflection, reflection transmission conversion, projection, transmission.

(1) The reflection type liquid crystal display itself does not emit light, through the light source in the space into the LCD panel, and then by its reflective plate will reflect the light to the eyes of people;

(2) The reflection transmission conversion type can be used as a reflection type when the light source in the space is sufficient, and the light source in the space is used as lighting when the light is not enough;

(3) Projection type is to use the principle of similar movie playback, the use of projected light department to project the image displayed by the liquid crystal display to the remote larger screen;

(4) The transmission type liquid crystal display completely uses the hidden light source as lighting.

Relevant Test Conditions: