Organic EL display panel and manufacturing method thereof

An organic electroluminescence (EL) display panel having an image display region and a peripheral region around the image display region in plan view, the organic EL display panel comprising:

• a substrate;
• an insulating resin layer disposed above the substrate and extending from the image display region to the peripheral region;
• an organic EL element array disposed above the insulating resin layer within the image display region;
• a sealing layer disposed above the organic EL element array and extending from the image display region to the peripheral region;
• and
• a sealing reinforcement layer laminated above the sealing layer, wherein
• the sealing layer includes a first sealing layer, a second sealing layer, and a third sealing layer that are laminated in this order from the substrate, the first sealing layer and the third sealing layer each being made of an inorganic material and the second sealing layer being made of a resin,
• in an outer peripheral portion of the sealing layer, the first sealing layer and the third sealing layer are in direct contact with each other without the second sealing layer disposed therebetween and extend to cover an outer end of the insulating resin layer, and
• an outer end of the sealing reinforcement layer is located outside the outer end of the insulating resin layer in plan view, wherein
• the insulating resin layer has, in the peripheral region, a groove that surrounds the organic EL element array,
• the insulating resin layer is divided into an inner insulating resin layer portion and an outer insulating resin layer portion by the groove, and
• the first sealing layer covers side surfaces and a bottom of the groove and the outer insulating resin layer portion.