We made the display turn on using the circuit board, display, battery, wires, and USB cable. the board is the main thing that connects everything. The display is to see if it works. The battery is for giving power to the circuit. The wires are for transferring the power. The USB is to give the data to the computer.
The custom printed circuit board is to connect everything in like the battery the display and many others.
The display is to show if the circuit works.
The is battery is for giving the circuit power to make it turn on.