Light-emitting device and electronic instrument

• US 7,138,764 B2
• Filed: 10/11/2002
• Issued: 11/21/2006
• Est. Priority Date: 10/24/2001
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kamikawa, Taketomi, Harada, Atsushi, Koyama, Tomoko, Oguchi, Norio, Kaneko, Takeo
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US10/268,988
• Publication Number:
  US 20030094897A1
• Time in Patent Office: 1,502 Days
• Field of Search: 313/498, 313/506, 313/512, 313/502, 313/509, 313/113
• US Class Current: 313/506
• CPC Class Codes: H01L 33/24 of the light emitting region, e.g. non-planar junction
• CPC Class Codes: H01L 33/385 the electrode extending at least partially onto a side surface of the semiconductor body
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/24 of metallic reflective layers H05B33/26 takes precedence
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

A light-emitting device includes a light-emitting layer capable of generating light by electroluminescence, a pair of electrodes applies an electric field to the light-emitting layer, and a substrate having a depression in a surface, and the light-emitting layer is disposed within the depression of the substrate.

Claims

1. A light-emitting device comprising:

a light-emitting layer capable of generating light by electroluminescence;

a pair of electrodes which applies an electric field to the light-emitting layer; and

a substrate having a depression in a surface,

wherein the light emitting layer is disposed within the depression of the substrate and has a convex surface extending away from the substrate, and is formed to function as an optical lens.

2. The light-emitting device as defined in claim 1,

wherein at least part of one of the electrodes is disposed over the depression, and is capable of reflecting light generated in the light-emitting layer.

3. The light-emitting device as defined in claim 1, further comprising:

a lens layer to function as an optical lens formed over the light-emitting layer.

4. The light-emitting device as defined in claim 1,

wherein the substrate is capable of reflecting light generated in the light-emitting layer.

5. The light-emitting device as defined in claim 1, further comprising:

a dielectric multilayer film which is capable of reflecting light generated in the light-emitting layer,

wherein the dielectric multilayer film is disposed over the depression of the substrate.

6. An electronic instrument comprising the light-emitting device as defined in claim 1.

7. A light-emitting device comprising:

a light-emitting layer capable of generating light by electroluminescence;

a pair of electrodes which applies an electric field to the light-emitting layer;

a gate electrode disposed between the electrodes which forms a conducting region within the light-emitting layer; and

a substrate having a depression in a surface,

wherein the light emitting layer is disposed within the depression of the substrate, and has a convex surface extending away from the substrate, and is formed to function as an optical lens.