Light-emitting element having picture elements
A display device includes a plurality of light-emitting elements aligned on a TFT substrate in a formation of a matrix. The plurality of light-emitting elements each have a flat surface portion and including a light-emitting layer, an anode, and a cathode, an insulating layer formed on the TFT substrate and under the light emitting element, and a tilted metal surface provided on a peripheral area surrounding the flat surface portion of the light-emitting element and having a tilt angle with respect to the flat surface portion of the light-emitting element. The tilted metal surface is provided on a surface of a slope of a bank that is provided on the insulation layer, and a width of a cross-section of the bank becomes smaller as the cross section conies farther away from a surface of the TFT substrate. A counter substrate is placed on the TFT substrate.
1. A light-emitting element having picture elements comprising:
a bank surrounding a central area and including a slope;
a metal cathode overlaying the slope;
an anode formed in the central area; and
an organic layer including a light-emitting layer formed on the anode in the central area, wherein
the organic layer is separated corresponding to each of the picture elements.
2. The light-emitting element according to claim 1 , further comprising:
an electron transporting layer between the metal cathode and the light-emitting layer and
a hole transporting layer between the electron transporting layer and the anode.
3. The light-emitting element according to claim 1 , further comprising:
an optical waveguide layer surrounded by the bank.
4. The light-emitting element according to claim 1 , wherein
the anode is a transparent electrode.
5. The light-emitting element according to claim 1 , further comprising:
a metal film deposited on the anode.
6. The light-emitting element according to claim 1 , further comprising a substrate, wherein
the bank has a cross sectional shape of a narrower width measured at a point farther from the substrate, and
the bank has the slope at each of side areas.
7. The light-emitting element according to claim 1 , wherein
the organic layer is formed in a form of an island and overlaps with the anode.
8. The light-emitting element according to claim 1 , wherein
the picture elements are configured to emit respective red-, green- and blue-light.
9. The light-emitting element according to claim 1 , wherein
the organic layer is configured to be divided into a red-color pixel, a green-color pixel and a blue-color pixel.
10. The light-emitting element according to claim 1 , wherein
the picture elements are aligned in a predetermined order in a matrix formation.
11. The light-emitting element according to claim 1 , wherein
the bank functions as a torus isolating an area of the picture element.
12. The light-emitting element according to claim 1 , further comprising:
a seal-off material on the metal cathode, wherein
lights emitted from the light emitting layer pass through the seal-off material.
13. The light-emitting element according to claim 12 , wherein
viewers see the lights after passing the seal-off material.