Display device with light emission separation layers of differing thicknesses

A display device comprising:

• a plurality of pixels including a first pixel, a second pixel, a third pixel and a fourth pixel that are arranged in a two-dimensional matrix, and
• a partition wall between any two of the first pixel, the second pixel, the third pixel and the fourth pixel, each of the pixels including
• a first electrode above a substrate;
• a first light emitting layer above the first electrode;
• a first light emission separation layer above the first light emitting layer, the first light emission separation layer including at least one of a hole transport layer or an electron transport layer;
• a second light emitting layer above the first light emission separation layer;
• a second light emission separation layer above the second light emitting layer, the second light emission separation layer including at least one of a hole transport layer or an electron transport layer;
• a third light emitting layer above the second light emission separation layer;
• a second electrode above the third light emitting layer;
• a reflector between the substrate and the first electrode;
• and
• an optical adjustment layer between the first electrode and the reflector, and wherein
• a thickness of the first light emission separation layer is different from a thickness of the second light emission separation layer in at least one of the first pixel, the second pixel, the third pixel or the fourth pixel;
• a thickness of the optical adjustment layer in one of the first pixel, the second pixel, the third pixel or the fourth pixel is different from a thickness of the optical adjustment layer in another one of the first pixel, the second pixel, the third pixel or the fourth pixel;
• the first pixel and the second pixel are adjacent in a vertical direction in a first column of the two-dimensional matrix;
• the third pixel and the fourth pixel are adjacent in the vertical direction in a second column of the two-dimensional matrix;
• the first pixel and the fourth pixel are adjacent in a horizontal direction in a first row of the two-dimensional matrix;
• the second pixel and the third pixel are adjacent in the horizontal direction in a second row of the two-dimensional matrix;
• in a plan view, an area of a light emitting unit of the first pixel, an area of a light emitting unit of the second pixel, an area of a light emitting unit of the third pixel, and an area of a light emitting unit of the fourth pixel are different from each other;
• the first pixel, the second pixel, and the third pixel have mutually different display colors;
• the mutually different display colors include a red display color, a green display color, and a blue display color;
• the first pixel, the second pixel, and the third pixel have mutually different emission intensities for their mutually different display colors;
• the first pixel is for a red color;
• the second pixel is for a green color;
• the third pixel is for a blue color;
• the thickness of the first light emission separation layer for the first pixel is less than the thickness of the first light emission separation layer for the second pixel;
• and
• the thickness of the first light emission separation layer for the second pixel is less than the thickness of the first light emission separation layer for the third pixel.