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4 Direct drive LCD display circuit diagram

2016-12-18 02:14  
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4 Direct drive LCD display circuit diagram
Each part of LCD has individual counter, latch, decoder and driver. Pumping signal feeds back to the motherboard of LCD. When the display section is disconnected, the phase and amplitude of the motherboard and display segment drive signal are the same. It shows no voltage on the 2 ends of display. When the display segment is triggered, its pumping signal phase position will be lager than 180 °, so the square wave voltage is 2 times than power supply voltage value. BCD code input signal can be produced from the dual BCD counter of cascade MC14518.