As shown in the figure, there is a display driving circuit composed of two NE555 timers, several switching transistors, an EL display, and the like. Displays made with this circuit are mainly used in displays in mobile phones, watches, and automated meters.
Display driver circuit
In the figure, an EL display driving circuit composed of NE555 or the like is different from a conventional EL driving circuit, which is composed of a low-loss NE555 and several switching crystals, and solves the cost of a flyback converter employed in a conventional EL driving circuit. And the space problem occupied.
The NE555(1) in the figure is the first switching circuit, which acts as a boost converter to generate a high voltage of approximately 200V required for EL driving, which voltage needs to be selected according to the size of the EL and the brightness required when changing the frequency; The NE555(2) is a 800Hz switching converter that produces a very high AC voltage to drive the EL display.
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