Real View of a 5 X 7 LED Matrix

This is the original view of a 5 x 7 LED Matrix.
Though called a 5 X 7 matrix display, it has 14 Pins.
Two or more of these pins come in common, thus creating 14 pins.
The LED matrix can be of two types
* Common Anode type
*Common Cathode type
The programming logic has to be changed depending on the type used
For larger displays, a number of such matrices are joined together and the required drive currenty is obtained using current driver ICs and transistors.
The pins of the matrix given in the figure are not in proper order. Hence if the PCB routing (taking the PCB layout) is done well, the complexities involved in te wiring can be avoided.
The first and eigth pin can be found out by wiring the circuit in a bread-board using a 5 V supply and series resistance of 330 ohms or 470 ohms.