Substrate for display device having a protective layer provided between the pixel electrodes and wirings of the active matrix substrate, manufacturing method for same and display device

A substrate for a display device comprising:

• a scan line;
• a signal line;
• a switching element provided on an insulating substrate;
• an interlayer insulation film;
• and
• a pixel electrode;
• wherein
• said switching element is provided at an intersection of the scan line and the signal line;
• said switching element includes a gate electrode connected to the scan line, a source electrode connected to the signal line, and a drain electrode connected to the pixel electrode;
• said interlayer insulation film includes a contact hole arranged to connect the drain electrode of the switching element to the pixel electrode;
• a protective layer is provided above the scan line and/or the signal line and is made of an insulating material, the protective layer does not have a contact hole above the scan line or above the signal line;
• and
• a portion of an underlying film under the protective layer contacts a portion of an overlying film over the protective layer.

A substrate for a display device comprising:

• a scan line;
• a signal line;
• a common capacitance wiring;
• a switching element provided on an insulating substrate;
• an interlayer insulation film;
• and
• a pixel electrode;
• wherein
• said switching element is provided at the intersection of the scan line and the signal line;
• said switching element includes a gate electrode connected to the scan line, a source electrode connected to the signal line, and a drain electrode connected to the pixel electrode;
• said interlayer insulation film includes a contact hole arranged to connect the drain electrode of the switching element to the pixel electrode;
• a protective layer is provided above at least one of the scan line, the signal line, and the common capacitance wiring and is made of an insulating material;
• and
• a portion of an underlying film under the protective layer contacts a portion of an overlying film over the protective layer.