Disclosed is a light-emitting element with a good carrier balance and manufacturing method thereof which does not require the formation of the heterostructure. The controller comprises a port interface, a readwrite interface, and a plurality of flip-flops. Both experimental and theoretical studies indicate that for this system, the displacement is over three times that of a same-sized conventional flextensional actuatortransducer. Hence, it is possible to eliminate a limit of number of times of test recording which depends on the size of the test recording area. A second substrate having a sealing material layer in the non-display area is provided.