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Dot Matrix Display IntroductionFeaturesHow to drive Dot Matrix Display

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7

1

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ro w

c o l u m n

p in

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F i g u r e 1 0 . 2 3 . A n o d e r o w m a t ri x L E D s ( F a i rc h i ld G M A 8 X 7 5 C )

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ro w

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p in

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1 3 3 4 1 0 6

F i g u r e 1 0 .2 2 . C a t h o d e r o w m a t r i x L E D s ( F a i rc h i ld G M C 8 X 7 5 C )

Structure of Dot Matrix Display

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y T wo parallel ports are needed to drive t h e matrix display .y One port drives t h e column w h ereas t h e ot h er port drives

th

e rows.

y One needs to scan t h e matrix LE D displays one row at atime, from top to bottom .

y For multiple matrix LE D displays in t h e application, time-multiplexing tec h nique needs to be used .

y D edicated driver c h ips suc h as MAX6952 (SPI interface)and MAX6953 (I2C interface) are available for cat h ode-rowmatrix LED displays to simplify t h e interfacing .

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y Concept of Multiplexingy Types of multiplexed Display

y Character-Oriented Displaysy Pixel-Oriented Displays

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