Smoothing Device, Smoothing Method, Thin Film Transistor, Display Substrate and Display Device

A surface roughness smoothing device comprising:

• a cavity, a plasma generating component, a magnetic field generating component, an electric field generating component and a carrier located within said cavity;
• wherein
• said carrier is used for carrying an object to be smoothed;
• said plasma generating component is used for generating plasmas within said cavity;
• said magnetic field generating component is used for generating a magnetic field within said cavity which is parallel to a surface of said object to be smoothed such that said plasmas are subjected to the Lorentz force in a direction parallel to the surface of said object to be smoothed;
• said electric field generating component is used for generating an electric field within said cavity which is perpendicular to the surface of said object to be smoothed such that said plasmas are subjected to an electric field force in a direction perpendicular to the surface of said object to be smoothed and pointing to said object to be smoothed.