Display device with non-planar reflective lower electrode
A display device includes a plurality of emitting elements corresponding to a plurality of pixels. The emitting element includes a lower electrode, an upper electrode having a light-transmitting property, and a light-emitting layer between the lower electrode and the upper electrode. The lower electrode includes a flat portion and an inclined portion that is inclined obliquely upward and outward from the central area of the flat portion. Both of the flat portion and the inclined portion include a reflective surface respectively. The reflective surface of the flat portion has a light reflectance lower than that of the reflective surface of the inclined portion.
1. A display device comprising a plurality of emitting elements corresponding to a plurality of pixels, wherein
each of the plurality of emitting elements includes
a lower electrode,
an upper electrode having a light-transmitting property, and
a light-emitting layer between the lower electrode and the upper electrode,
the lower electrode includes a flat portion and an inclined portion that is inclined obliquely upward and outward from a central area of the flat portion,
the plurality of pixels are divided by a bank layer,
the bank layer has an uppermost surface and a side surface intersecting the uppermost surface,
the bank layer has an opening including the side surface,
the side surface is inclined obliquely upward and outward,
the lower electrode includes a first layer that is located on the bank layer and inside the opening, and a second layer that is located on the first layer while avoiding overlapping at least an upper end portion of the side surface inside the opening,
the first layer includes a portion that overlaps the side surface and does not overlap the second layer,
the portion is the inclined portion,
the second layer is the flat portion,
the inclined portion is located on an entirety of the side surface,
both the flat portion and the inclined portion include a reflective surface respectively, and
the reflective surface of the flat portion has a light reflectance lower than that of the reflective surface of the inclined portion.
2. The display device according to claim 1 , wherein
the reflective surface of the flat portion is made of a material having a light reflectance lower than that of the reflective surface of the inclined portion.
3. The display device according to claim 2 , wherein
the bank layer overlies a peripheral edge area of the flat portion of the lower electrode,
the side surface is inclined obliquely upward and outward surrounding the central area.
4. The display device according to claim 1 , wherein
the lower electrode further includes a conductive layer having a light-transmitting property, and
the conductive layer is disposed in at least one of a first area and a second area, the first area being on the first layer and the second layer, the second area being between the first layer and the second layer.
5. The display device according to claim 1 , wherein
the reflective surface of the flat portion has a surface roughness higher than that of the reflective surface of the inclined portion.
6. The display device according to claim 5 , wherein
the lower electrode further includes a conductive layer that is stacked on and in contact with at least the flat portion chosen from between the flat portion and the inclined portion and has a light-transmitting property, and
the conductive layer includes a lower surface that is roughened corresponding to the surface roughness of the reflective surface of the flat portion, and an upper surface that is roughened according to the lower surface.