Hello, this is my first post here! (Signed up couple of minutes ago)
I've used these 1602 LCD modules in many of my projects. Always wondered what these empty pcb pads are doing there. Sorry I couldn't find proper datasheet for these cheap chinese modules that I collect from local shop. When I search for these, I always get the Hitachi controller chip datasheet (which I am familiar with). Maybe I can't figure out the correct string to search. Looks like there are some solder jumpers and a place for some kind of chip, as well as pads for two capacitors.
If anyone knows their functionality, please let me know. The module works fine, I am just curious.
Thanks!!