Display device substrate, method for manufacturing the same, display device, method for forming multi-layer wiring, and multi-layer wiring substrate

A display device substrate comprising an insulating substrate, comprising:

• at least one of a terminal area having a connection terminal to be connected to an external connection component, and
• a peripheral circuit region having a peripheral circuit formed thereon, on the insulating substrate,
• said display device substrate comprising:
• a plurality of organic-inorganic film stacked bodies stacked on top of each other;
• a first wiring;
• and
• a second wiring,
• wherein each said organic-inorganic film stacked body is formed of an inorganic insulating film that is stacked directly on and above an organic insulating film,
• a lowermost organic-inorganic film stacked body of said plurality of organic-inorganic film stacked bodies is stacked on said first wiring,
• said second wiring is stacked on said lowermost organic-inorganic film stacked body, and is connected to said first wiring through a contact hole formed in said lowermost organic-inorganic film stacked body, and
• at least a portion of a wall surface of a hole in said organic insulating film is covered with said inorganic insulating film in said contact hole.