How would you use disproven in a sentence please? Is disproven interchangeable with disproved?
There are really two issues here.
The past participle as adjective (as in a proven technology) indicates a general condition. The past tense is also used as an adjective (a proved technology) in a specific case.
On the other hand, AmE has progressively been dropping/ deprecating the past participle, preferring the past tense for both the purposes. This is across verbs, not for prove alone, or for that matter, in case of adjective use alone.
Grammatically both are correct and acceptable. (Though I cannot imagine any practical use for disproven per se, though proven is very handy.) They have their uses as noted above. Both can be found in literature, with increasing use in AmE writing of the pp where the pt would be expected.