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How Liquid Crystal Display (LCD) is made

14 Nov 2016 - LCD dispaly,LCD Moudle

Liquid crystal displays (LCDs) consist of liquid crystals that are activated by electric current. They are used most frequently to display one or more lines of alphanumeric information in a variety of devices: fax machines, laptop computer screens, answering machine call counters, scientific instruments, portable compact discplayers, clocks, and so forth. The most expensive and advanced type active matrix displays are even being used as screens for handheld color TVs. Eventually, they may be widely used for large screen, high definition TVs.

A working LCD consists of several components: display glass, drive electronics, control electronics, mechanical package, and power supply. The display glass  between which the liquid crystals lie is coated with row and column electrodes and has contact pads to connect drive electronics (electric current) to each row and column electrode. The drive electronics are integrated circuits that supply current to "drive" the row and column electrodes. The control electronics are also integrated circuits. They decode and interpret the incoming signals from a laptop computer, for example and send them to the drive electronics. The mechanical package is the frame that mounts the printed circuit boards for the drive and control electronics to the display glass. This package also strengthens and protects the display glass and anchors the entire display to the device using the LCD, whether it is a laptop computer, a fax machine, or another device. Finally, the power supply is an electronic circuit that supplies current to the LCD. Equipment makers who use LCDs often purchase the power supplies separately.

The Future

The future is clearly with active matrix LCDs, even though the current rejection rate is very high and the manufacturing process is so expensive. Gradual improvements are expected in the manufacturing process of AMLCDs, and in fact companies are already beginning to offer inspection and repair equipment that may cut the current rejection rate from 50 percent down to around 35 percent.