C340 pilot reported a failure of the electronic flight display system during cruise flight in IFR conditions that resulted in an in-flight upset. After correcting the upset by referencing backup instruments; the pilot was able to regain control and proceed to VFR weather where a safe landing was accomplished.

Narrative

Upon entering cruise flight the aircraft's electronic flight display (Aspen EFD1000) malfunctioned; during which time the Autopilot made an unexpected 30 degree bank turn to the right and began to dive the airplane. The Autopilot disconnected after making such inputs. The Aspen EFD continued to provide unreliable information for the next 10 minutes; during which time the vacuum AI instruments became unreliable as well; resulting in multiple partial panel unusual attitudes being corrected with a steam gauge altimeter and DG. The situation was remedied with no loss of property or personnel; ultimately utilizing the resources on the ground from ATC to find an airfield with VFR weather.From a pilot's standpoint; the unstable flight and unusual attitudes resulted from my failure to immediately correct the unexpected change introduced by the Autopilot. I am solely responsible for this failure. Extensive unusual attitude training during my primary flight training and subsequent type/recurrents saved my life.While this emergency ultimately had a positive ending; it took every ounce of talent and training within the cockpit of the aircraft that night. This would not have been a fair fight for a low time instrument pilot. The Special Airworthiness Information Bulletin (SAIB) regarding Aspen; should be revisited and expanded.