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Good spot @MaBe! My orthagonal viewing glasses didn't pick up on that in addition to B7-A8. ;-)
As the USB connector is supplying the 5V, it appears 3V3 is available after the regulator as the VDD output pin3.
https://github.com/espruino/EspruinoBoard/raw/master/Pico/pdf/schematic_1v3.pdf
Robin
@MaBe
Hmm, is this a new version of the HD44780 that operate with 3v3?
AFAIK it is a 5v device.