Building a text display using Light Emitting Diodes (LEDs) is quite interesting. There are different configurations which these LEDs could be arranged to form a matrix. It could be a 5 x 7 matrix (i.e. 5 columns by 7 rows per character) or an 8 x 8 matrix or a 16 x 16 matrix etc. depending on how detailed or how large you prefer each character to be (pixel density).