I don't think I understand how are disproven ideas a subset of unproven ones. Disproven means, "proven to be false", while unproven means there is no proof yet

I don't think I understand how are disproven ideas a subset of unproven ones. Disproven means, "proven to be false", while unproven means there is no proof yet, either positive or negative, right? How can one be a subset of the other?