Display device

A display device, comprising:

• a substrate;
• a light emitting element disposed on the substrate;
• a first layer disposed directly on the light emitting element, and
• a second layer disposed on the first layer,
• wherein the light emitting element includes a first electrode disposed on the substrate, an organic layer disposed on the first electrode, and a second electrode disposed on the organic layer,
• wherein the first layer has a first refractive index greater than or equal to about 1.7 and less than 2.2 and a thickness from about 5000 nm to about 15000 nm,
• wherein the second layer has a second refractive index from about 1.25 to about 1.45 and a thickness from about 2000 nm to about 6000 nm,
• wherein the second electrode has a first thickness,
• wherein the thickness of the first layer is a second thickness,
• wherein the thickness of the second layer is a third thickness, and
• wherein the first thickness is from about 750 nm to about 1150 nm.

A display device, comprising:

• a substrate;
• a light emitting element disposed on the substrate;
• a first layer disposed on the light emitting element,
• a second layer disposed on the first layer;
• and
• an encapsulation layer disposed on the second layer,
• wherein the encapsulation layer includes a lower inorganic encapsulation layer disposed on the second layer, an organic encapsulation layer disposed on the lower inorganic encapsulation layer, and an upper inorganic encapsulation layer disposed on the organic encapsulation layer,
• on color coordinates of a CIE diagram where a variation Δu′ of a first component of light emitted from the light emitting element through the first layer, the second layer and the encapsulation layer is a horizontal axis, a variation Δv′ of a second component of light emitted from the light emitting element through the first layer, the second layer and the encapsulation layer is a vertical axis and each of the variation Δu′ of the first component and the variation Δv′ of the second component in a square one is zero,
• each of the variation Δu′ of the first component and the variation Δv′ of the second component has a negative value at viewing angles of 30°, 45° and 60°,
• the variation Δu′ of the first component and the variation Δv′ of the second component decrease when the color coordinates are sequentially measured at a viewing angle from about 0° to about 30° and a viewing angle from about 30° to about 45°, and
• the variation Δu′ of the first component and the variation Δv′ of the second component increase when the color coordinates are measured at a viewing angle from about 45° to about 60°.

A display device, comprising:

• a display electrode;
• a first layer having a refractive index greater than or equal to about 1.7 and less than 2.2 and a thickness from about 5000 nm to about 15000 nm, the first layer disposed on the display electrode;
• a second layer having a refractive index from about 1.25 to about 1.45 and a thickness from about 2000 nm to about 6000 nm, the second layer disposed on the first layer;
• and
• an encapsulation layer disposed on the second layer,
• wherein the encapsulation layer includes a lower inorganic encapsulation layer disposed on the second layer, an organic encapsulation layer disposed on the lower inorganic encapsulation layer, and an upper inorganic encapsulation layer disposed on the organic encapsulation layer,
• wherein the lower inorganic encapsulation layer includes:
• a first lower inorganic encapsulation layer with a third refractive index disposed on the second layer;
• a second lower inorganic encapsulation layer with a fourth refractive index disposed on the first lower inorganic encapsulation layer;
• a third lower inorganic encapsulation layer with a fifth refractive index disposed on the second lower inorganic encapsulation layer;
• and
• a fourth lower inorganic encapsulation layer with a sixth refractive index disposed on the third lower inorganic encapsulation layer, wherein
• the third refractive index is greater than the fourth refractive index,
• the fourth refractive index is greater than the fifth refractive index, and
• the fifth refractive index is greater than the sixth refractive index,
• wherein the first lower inorganic encapsulation layer, the second lower inorganic encapsulation layer, the third lower inorganic encapsulation layer, and the fourth lower inorganic encapsulation layer are formed from a silicon oxynitride material, and an oxygen content in the silicon oxynitride material gradually increases whereas a nitrogen content in the silicon oxynitride material gradually decreases in a direction from the first lower inorganic encapsulation layer to the fourth lower inorganic encapsulation layer.