Voltage variation capacitance device

Disclosed is a film voltage control capacitor device, which comprises a film with a supporting structure and a backplane with a cantilever structure; at least one protuberant structure is disposed between the film and the backplane; a hollow structure is formed on the backplane; the film is parallel with the backplane; the hollow structure has at least one cantilever structure; and the protuberant structure and the cantilever structure forms a supporting body. when a pressure is transferred to the film, the protuberant structure contacts the cantilever structure; since the protuberant structure is pressed to deform, so the film has a displacement deflection, The electric field of the capacitor is distributed between the film and the backplane periphery. The protuberant structure can be formed on the film surface or the cantilever structure surface.