(The picture doesn’t actually work) I was wandering if it is possible to make a grid of AND gates so when you power two lines the point at the intersection will light up. It’s not quite a decoder, encoder, rom or ram I think it’s most like a display but I need it to be as thin as possible.

it is, but I fon’t really remember how… Watch MatBatWings on yt. He explains this mechanic in his LRR displays video (I think ep. 8).