Segment LCD vs Graphic LCD: When Each Is the Right Choice
Segment displays win on cost and power; graphic displays win on layout flexibility. Most projects need one or the other — rarely both.
A segment LCD has a fixed set of electrodes. Each one either shows or hides its segment — nothing more. That fixed layout is exactly why it is cheap to make, why it draws microamps, and why it never needs refreshing in software.
A graphic LCD has a pixel-addressable matrix. You control individual dots, so text, icons and simple graphics can be rearranged without changing the glass.
Choose segment when the layout is settled and the product will ship in volume for years. Choose graphic when the display needs to convey changing values, menus or multiple languages.
A common mistake is specifying a graphic display where a segment one would do — you pay more in BOM and power for flexibility you never use.
