Did you want to program an Arduino to drive those particular 5x7 display modules or did you want to design your own 5x7 display modules?Form the datasheet (http://www.electronics123.net/amazon/datasheet/MLD1_datasheet_v1.pdf) it looks like they are sing the SPI hardware to shift data out very quickly. For each line of each module you shift out two bytes: one to select which column and one to light the rows in that column.
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