Segment code LCD screen is a kind of LCD screen display mode. The LCD screen has two modes: pen-break mode and dot matrix mode. Segment code is also called pen-break.If calculator, clock and so on, display content is all Numbers

Segment code LCD screen, the process is much simpler than the lattice, of course, can only show relatively simple content.The Chinese characters and graphics of the segment code LCD can only be displayed in a fixed pattern, and the Numbers can be changed.And the lattice of all the display, are arbitrary transformation

2.HTN film LCD screen

High Twisted Nematic

Features: high contrast, low power consumption, low drive voltage

The nematic liquid crystal molecules are sandwiched between two sheets of transparent glass.This type of LCD is characterized by poor dynamic drive performance, but the perspective is wider than the TN type

3.STN film LCD screen

STN (Super Twisted Nematic) is a kind of electrical field that changes the arrangement of liquid crystal molecules with distortion of more than 180 degrees to change the rotatory state, and the applied electric field changes the electric field through progressive scanning. In the process of electric field changing the voltage repeatedly in the electric field, the recovery process of each point is slow, thus producing afterglow.It has the advantage of low power consumption and the biggest advantage of power saving.

The principle of color STN display is to add a color filter on the traditional monochrome STN liquid crystal display, and divide each pixel in the monochrome display matrix into three sub-pixels. Red, green and blue are respectively displayed through the color filter to display the color picture.Different from TFT, STN is Passive Passive LCD, which can display up to 65536 colors.

It is mainly divided into ordinary STN, FSTN, CSTN and DSTN.

Ordinary STN means that the liquid crystal rotates 180~270 degrees inside the liquid crystal screen, and the liquid crystal screen is` pasted with ordinary polarizing film. Due to the dispersion, the background color of the liquid crystal screen will present a certain color.

FSTN (Film+STN), in order to improve the background color problem of ordinary STN, a compensation Film is added on the polarizing Film to eliminate the dispersion and achieve the black and white display.

CSTN (Color STN) and Color STN, on the basis of FSTN technology, add a layer of RGB Color film to achieve Color display, and generally drive a higher number.

DSTN (Double STN) and Double STN (Double STN), with one layer as the driving layer and the other as the compensation layer, belong to the STN black-and-white technology. Compared with FSTN, the contrast is higher, and the dispersion can be compensated with the temperature to achieve high contrast in the wide temperature range.

The STN mode display principle is similar to that of TN. Different from that of TN, the liquid crystal molecules with torsional column-field effect rotate the incident light by 90 degrees, while the STN ultra-torsional column-field effect rotates the incident light by 180 to 270 degrees.To be clear, the pure TN liquid crystal display itself only has light and dark (or black and white), there is no way to achieve color change.However, if a color filter is added to the traditional monochrome STN liquid crystal display, and any pixel of the monochrome display matrix is divided into three sub-pixels, the red, green and blue primary colors are displayed through the color filter, and then the color of the full color mode can be displayed through the proportion of the three primary colors.In addition, the larger the size of the tn-type LCD screen, the worse the contrast will be. However, the improved technology of STN can make up for the lack of contrast.