Display device having lens portions for enhanced extraction of light

A display device comprising:

• (A) a plurality of light-emitting devices comprising a first electrode, a second electrode, and an organic layer including a light-emitting layer therebetween and configured to resonate light generated in said light-emitting layer between a first interface defined by an interface between said first electrode and said organic layer and a second interface defined by an interface between said second electrode and said organic layer;
• and
• (B) a transparent upper substrate having a first side facing said second electrode and a second side located on an opposite side of said first side, and fixed above said second electrode,
• wherein:
• said display device satisfies the below-described equations (1-1), (1-2), (1-3) and (1-4),
• lens portions are provided on said first side of said transparent upper substrate such that a portion of said light generated in said light-emitting layer is allowed to pass through said lens portions, and
• the number of lens portions provided for each light-emitting device is set as the integer part of a coefficient α, where α is an aspect ratio of a planar shape of a light-emitting region of the light-emitting device,
• 0.7{−Φ1/(2Π)+m1}≦2×OL1/λ≦1.2{−Φ1/(2Π)+m1} equation (1-1)
• 0.7{−Φ2/(2Π)+m2}≦2×OL2/λ≦1.2{−Φ2/(2Π)+m2} equation (1-2)
• L1<L2 equation (1-3)
• m1<m2 equation (1-4)
• where,
• L1 is a distance from a maximum light-emitting position of said light-emitting layer to said first interface,
• OL1 is an optical distance from said maximum light-emitting position of said light-emitting layer to said first interface,
• L2 is a distance from said maximum light-emitting position of said light-emitting layer to said second interface,
• OL2 is an optical distance from said maximum light-emitting position of said light-emitting layer to said second interface,
• m1, m2 are integers,
• λ is a wavelength of a maximum peak in a spectrum of light generated in said light-emitting layer,
• Φ1 is a phase shift of reflected light occurred at said first interface (unit:
• radian), with a proviso of −2Π<Φ1≦0, and
• Φ2 is a phase shift of reflected light occurred at said second interface (unit:
• radian), with a proviso of −2Π<Φ2≦0, wherein said plurality of light-emitting devices are arrayed in stripes, and more than one of said lens portions are arranged per each light-emitting device.