LCD segment code screen is known as a low-voltage drive, but in fact, it can not be generalized, in the multi-way drive conditions, due to the reduction of duty cycle, its actual drive voltage (Vee) sometimes as high as ten to twenty volts. And like PDLC, fast multistable (MLCD) liquid crystal, etc., the driving voltage may be as high as tens to hundreds of volts.
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In addition to OLED, most of the new flat panel displays have higher operating voltages. It can be seen that the low-voltage driving advantages of commonly used TN, STN and other liquid crystal displays are still not reduced. However, the advantage of low-voltage drive is only that it can be compatible with the low-voltage of large-scale integrated circuits, so although the operating voltage of OLED is slightly higher than that of LCD, the operating voltage advantage of LCD display is not obvious compared with OLED.
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The lcd segment code screen is very small, basically negligible, and the size of the working current is also of great significance to the application. The general liquid crystal display is field-effect type, so the working current is very small, only a few tenths of a microampere per square centimeter to a few microampere, and EL, PDP and other not only high working voltage, working current is also large, OLED working voltage is low, but he belongs to the current type device, working current is large, and requires constant current, steady current. Can not be compared with liquid crystal display. Only like electrophoretic displays, electronic ink (e-ink) and DMD microdisplays have operating currents comparable to liquid crystal displays.