What brand is your controller (pic of the label would help, or link to where you purchased it from would be better)?
The ZQ100 has several versions, with 5 wire and 6 wire versions. What version did you purchase? (a link would help)
The versions are/may be controller specific (e.g. one of the 5 wire versions works with BrainPower controllers). They don't have the typical throttle wiring (typical with have 5V, ground, and throttle output signal), and don't have a 5V input from the controller, rather the unit has a 5V supply to convert the battery level voltage being supplied by the red conductor.
As mentioned, if you didn't purchase the controller and throttle/display as a set, they are likely incompatible. You may be able to get the voltage readout to work, and possibly the throttle function, but the other display info (speed, etc.) or control functions (changing assist levels) will not work.
I believe there is a version of the throttle/display, that provides throttle signal via the digital out output of the unit, which requires a controller that can interpret that digital signal as though it were a typical analog voltage throttle input, so matching the right unit to the controller would be absolutely required in that case.
I believe later versions of that form factor are the LH-100 and the QS-S4, that look the same, but wouldn't be compatible with controllers that use the ZQ100 unit even though they look exactly the same.