Although the pinouts are fairly standard for most displays beware of a few
common variations:
+5V and GND can be reversed
The backlight connections can be reversed. Backlights are usually LED without
an on board current limit resistor. The LED is usually a fairly high current
device/devices (up to 500mA!, but 30mA will usually work well enough for a
night-light display). Some modules use EL backlights that are driven by high
voltage (around 100V, 400Hz) AC.
The connections to the bias generator can be different. Some displays have an
on-board bias supply, others require an external supply. Most need the
external bias voltage control pot (usually around 10K-20K).
Sometimes a pin on the connector is a display enable pin of either active high
or low polarity. If present, it is usually biased ON with an internal
resistor.
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