Transcription of AN1428, LCD Biasing and Contrast Control Methods
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AN1428, LCD Biasing and Contrast Control Methods
2012 Microchip Technology 1AN1428 INTRODUCTIONThis Application Note provides Methods that can beused to provide Biasing voltages for Liquid Crystaldisplays. This document covers most of the biasingmethods used in the PIC microcontrollers with an TYPESLCD types and LCD waveforms determine the type ofbiasing that is required. There are different kinds ofLCD Biasing , based on the are two electrodes where the LCD waveforms aredriven; they are called SEGMENTs (SEGs) andCOMMONs (COMs). The LCD requires an AC waveformto be applied between these electrodes. Based on the number of SEGMENT and COMMON electrodes, the LCDs can be classified in two or Direct Drive DisplaysStatic or Direct Drive LCDThe static waveform will have only one COMMON elec-trode and multiple SEGMENT electrodes. The numberof pixels it can drive is the number of SEGMENTs onthe LCD.
2012 Microchip Technology Inc. DS01428A-page 3 AN1428 Multiplex Display In the multiplex display, there will be more than one COMMON electrode, …
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