Thin film transistor, display device and liquid crystal display device and method for manufacturing the same

A method for manufacturing a display device, comprising the steps of:

• forming a gate electrode over a first substrate;
• forming a gate insulating film over the gate electrode;
• forming a semiconductor film over the gate insulating film;
• forming a source electrode and a drain electrode over the semiconductor film;
• forming a first protection diode and a second protection diode;
• and
• discharging a material of a black matrix by a droplet discharge method over the source electrode and the drain electrode,
• wherein the first protection diode is electrically connected to one of the source electrode and the drain electrode, and
• wherein the second protection diode is electrically connected to the gate electrode.

A method for manufacturing a display device, comprising the steps of:

• forming a gate electrode over a first substrate;
• forming a gate insulating film over the gate electrode;
• forming a semiconductor film over the gate insulating film;
• forming a source electrode and a drain electrode over the semiconductor film;
• forming a color filter over the gate insulating film after forming the source electrode and the drain electrode;
• forming a first protection diode and a second protection diode;
• and
• discharging a material of a black matrix by a droplet discharge method over the source electrode and the drain electrode,
• wherein the first protection diode is electrically connected to one of the source electrode and the drain electrode, and
• wherein the second protection diode is electrically connected to the gate electrode.