If you don't mind using an extra chip per display, you could have a lot of them. I did an article about driving graphical LCD displays using I2C or SPI here:http://www.gammon.com.au/forum/?id=10940With I2C you could potentially have 8 displays (since you share the same 2 pins: SDA/SCL) and you can configure the chip to have up to 8 addresses. With SPI you can have as many displays as you can spare SS pins for (3 wires for MOSI/MISO/SCK plus one extra one for SS per display).With a Mega you might not need to bother because you have some spare pins, but it is an idea.
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