The flicker issue is because if you don’t blank out the area where next text is to be written, it will just write over the old without erasing it first. So in this case I have 23 volts, then go to say 22.9. Instead of blanking the whole screen and re displaying everything, the solution is to put a rectangle over the text, then write the text. But doing so means the text disappears then reappears, though with some new digits. But the duhits that didn’t change still go away abd cone back, appearing to flicker. That’s why I’m adding this to my power supply sketch. So that only the digits that change will get blanked out first. But since they are changing anyway, it doesn’t look out of place.