The STN (Super Twisted Nematic Super Twisted Nematic) is by far the most contact with LCD, and several other than LCD, the STN type belong to the passive matrix LCD device, it has the advantage of low consumption, save energy has the biggest advantage, the price is cheaper also, lack of points are poor brightness, color, contrast, under the strong light may can't see the screen, the reaction speed is slower, easy to cause ghosting when play dynamic images.

The STN color display principle is in the traditional monochrome the STN displays and add a color filter, and every pixel of monochrome display matrix is divided into three sub pixel, respectively through the color filter shows red, green, blue three primary colors can show the colorful picture. And the STN TFT different genera in passive passive LCD screen, generally can show highest 65 k kinds of colour. Not gray-scale the STN, now has the STN main CSTN and DSTN. CSTN Color the STN, generally USES the transmission type lighting, transmission type to use plus light screen, called the backlight, lighting light source To be installed on the back of the LCD. Transmission type LCD in normal light and dark offline display effect is very good, but is especially difficult to see in the sun in the outdoor display, backlight also consumes power. DSTN double the STN, the past is mainly used in some laptop, also is a kind of passive display technology, using two display layer, this kind of display technology solves the traditional problem of drift in the STN displays, and because the DSTN also USES double scanning technique, thus display effect is a dramatic increase in the STN.