Applications of polycrystalline silicon (polysilicon) thin film transistors (TFTs) to active matrix organic light emitting displays require further performance improvement. The biggest leverage in circuit performance can be obtained by reducing channel length from the typical current values of 3-6μm to 1μm, or less. However, short channel effects and hot-carrier induced instability in scaled down conventional self-aligned polysilicon TFTs can substantially degrade the device characteristics. To reduce these effects and allow proper ...