LIGHT EMITTING APPARATUS

• US 20110006313A1
• Filed: 04/28/2009
• Published: 01/13/2011
• Est. Priority Date: 05/09/2008
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sumioka, Yukari
• Granted Patent: US 8,389,980 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/10 OLED displays

Abstract

Provided is a light emitting apparatus in which light extraction efficiency can be improved without adversely affecting a functional layer of a light emitting device. The light emitting apparatus includes multiple light emitting devices formed on a substrate, each of the multiple light emitting devices at least including: a reflective layer; a first electrode; the functional layer including an emission layer with an emission region; and a second electrode. In which an optical waveguide including a periodic structure is formed between the emission regions and the optical waveguide includes a surface which is opposite to the substrate and is more repellent to a light emitting material liquid for forming the emission layer than the emission region.

Claims

1. A light emitting apparatus, comprising:

a substrate;

multiple light emitting devices formed on the substrate, each of the multiple light emitting devices comprising;

a reflective layer;

a first electrode;

a functional layer including an emission layer with an emission region; and

a second electrode; and

an optical waveguide which is formed between the emission regions and comprises a periodic structure,

wherein the optical waveguide has an optical distance in a direction perpendicular to a surface of the substrate, which is smaller than twice an optical distance of each of the emission regions in the direction perpendicular to the surface of the substrate.

2. The light emitting apparatus according to claim 1, wherein the optical waveguide comprises a surface which is opposite to the substrate and is more repellent to a light emitting material liquid for forming the emission layer than the emission region.

3. The light emitting apparatus according to claim 1, wherein the optical waveguide has an insulating property.

4. The light emitting apparatus according to claim 1, wherein the second electrode is further formed on the optical waveguide and comprises one of a light transmissive electrode and a metal translucent electrode.

5. The light emitting apparatus according to claim 1, wherein the periodic structure contains metal.

6. The light emitting apparatus according to claim 1, further comprising a light shielding layer located on a light extraction side of the light emitting apparatus,

wherein light extracted to an outside through the periodic structure has one of a maximum intensity and a maximum luminance in a direction having an angle larger than 90°

relative to a guided-wave direction of the optical waveguide.

7. The light emitting apparatus according to claim 1, wherein the optical distance of the optical waveguide in the direction perpendicular to the surface of the substrate is 3/8 times or more to 11/8 times or less a light emission peak wavelength λ

of the emission layer.