A method and apparatus for improving display contrast, the method includes: providing a display array substrate having a metal layer; forming a photoresist layer on a surface of the metal layer; performing an exposure and development processes on the photoresist layer to expose a portion of the metal layer; performing an etching process on the portion of the metal layer to form metal wires; and subjecting an oxidation treatment to sidewalls of the metal wires to generate an oxide on the sidewalls of the metal wires.