I’ve had some success working with similar boards before and they are usually fairly standard, based on a Hitachi driver from the 80’s.
If you’ve not already seen it, here’s a guide to interfacing:
I can’t answer the constant current question but across various examples of these displays, I’ve ‘just’ fed the backlight 5V from available PSU – normally 5v 1-2A or straight from an Arduino – and been ‘OK’. Is there a measurable resistance to the array, even if there is no visible resistor component?
+44 7813 810 765 @alexgibson3d 37 Royal Avenue, Reading RG31 4UR
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