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.
AN1428 DS01428A-page 6 2012 Microchip Technology Inc. BIASING USING RESISTOR LADDER External Resistor Ladder One of the simplest ways to generate the bias voltages
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