A current sense device for a power transistor is described. Also disclosed is a transgenic plastid, preferably a chloroplast, containing a genome transformed by integration of an expression cassette having a non-plant gene encoding an IFN\u03b12b polypeptide and having regions that encode a polyhistidine tag and a thrombin cleavage site fused with the IFN\u03b12b polypeptide. Each new bucket is contained within at least one existing bucket and the new bucket becomes a child bucket and the existing bucket containing it becomes a parent bucket. A compensating signal is sent to an emitting device driving unit for compensating the data signal input into the pixel of active organic electro-luminescence device so as to improve uniformity in the brightness of the active organic electro-luminescence device. The stripped source code is compiled to provide stripped object code. The first shielding layer and the second shielding layer are grounded individually, and are in symmetry about the symmetric plane.