Display device and manufacturing method therefor, and multi-piece display panel

A multi-piece display panel having a plurality of manufacturing areas for manufacturing a plurality of display devices,

• wherein each of the plurality of manufacturing areas includes:
• an electrode layer that includes a plurality of pixel electrodes arranged in a display area, and a visual recognition electrode positioned relatively to the plurality of pixel electrodes outside the display area,
• a plurality of layers that include a light emitting layer overlapping with the electrode layer and emitting light by electroluminescence, a lowermost layer being in contact with the plurality of pixel electrodes in the display area, and
• a common electrode that faces the plurality of pixel electrodes and is in contact with any of the plurality of layers,
• wherein the plurality of layers include a light releasing layer that emits light by photoluminescence, and a weak light releasing layer that emits less light by the photoluminescence than the light releasing layer,
• at least the light emitting layer is the light releasing layer,
• the light releasing layer includes a plurality of light releasing sections that are separated from each other, and a first inspection portion that is positioned relatively to the plurality of light releasing sections and overlaps with the visual recognition electrode,
• the weak light releasing layer includes a plurality of weak light releasing sections separated from each other by overlapping with corresponding one of the plurality of light releasing sections and a second inspection portion that is positioned relatively to the plurality of weak light releasing sections and overlaps with the first inspection portion,
• there are a first region and a second region that differ depending on whether or not there is an overlap with the second inspection portion inside an outer shape of the first inspection portion, and
• the first region is sandwiched between any pair of portions of the second region in any of a plurality of directions orthogonal to each other.

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

• forming an electrode layer so as to include a plurality of pixel electrodes arranged in a display area, and a visual recognition electrode positioned relatively to the plurality of pixel electrodes outside the display area;
• forming a plurality of layers so as to include a light emitting layer overlapping with the electrode layer and emitting light by electroluminescence, a lowermost layer being in contact with the plurality of pixel electrodes in the display area;
• forming a common electrode so as to face the plurality of pixel electrodes and to be in contact with any one of the plurality of layers;
• and
• positional deviation inspection,
• wherein the plurality of layers include a light releasing layer that emits light by photoluminescence, and a weak light releasing layer that emits less light by the photoluminescence than the light releasing layer,
• at least the light emitting layer is the light releasing layer,
• the light releasing layer includes a plurality of light releasing sections that are separated from each other, and a first inspection portion that is positioned relatively to the plurality of light releasing sections and overlaps with the visual recognition electrode,
• the weak light releasing layer includes a plurality of weak light releasing sections separated from each other by overlapping with corresponding one of the plurality of light releasing sections and a second inspection portion that is positioned relatively to the plurality of weak light releasing sections and overlaps with the first inspection portion,
• there are a first region and a second region that differ depending on whether or not there is an overlap with the second inspection portion inside an outer shape of the first inspection portion,
• the first region is sandwiched between any pair of portions of the second region in any of a plurality of directions orthogonal to each other, and
• the positional deviation inspection includes:
• recognizing the visual recognition electrode by reflected light,
• recognizing the first inspection portion and the second inspection portion by an intensity of light emission by the photoluminescence being different in the first region and the second region, and
• determining a positional deviation of the light releasing layer and the weak light releasing layer according to a relative position of the visual electrode and the first inspection portion and the second inspection portion.