LCD direct drive circuit

Published:2011/8/11 3:31:00 Author:John | Keyword: LCD, direct drive | From:SeekIC

Every phase of LCD has the separate counter, latch, decoder and driver. Excitation signal is also fed back to the floor plate of LCD (liquid crystal display). When the display segment is disconnected, the floor plate and display segment drive signal to be with the same phase and amplitude. So there is no voltage across the segment. When the segment is encouraged, the excitation signal phase is greater than 180 °. So the square-wave voltage is two times more than the IC supply voltage. Dual-counter BCD from the cascade MC14518 can input signals by generating BCD code.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Temperature_Control/LCD_direct_drive_circuit.html

Print this Page | Comments | Reading(3)