LIGHTING DEVICE

• US 20120241731A1
• Filed: 12/21/2009
• Published: 09/27/2012
• Est. Priority Date: 12/02/2009
• Status: Active Grant

• Current Assignee: Kumho Electric Inc.
• Original Assignee: Kumho Electric Inc.
• Inventors: Ban, Tae Hyun, Kim, Kwang Bok
• Granted Patent: US 8,643,028 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: F21S 9/037 the solar unit and the lighting unit being located within or on the same housing
• CPC Class Codes: F21V 33/006 General building constructions or finishing work for buildings, e.g. roofs, gutters, stairs or floors; Garden equipment; Sunshades or parasols
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: H01L 31/153 formed in, or on, a common substrate
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention provides a lighting device, including: a second OLED layer formed on a window; a solar cell formed on the second OLED layer; and a first OLED layer formed on the solar cell.

Claims

1. A lighting device, comprising:

a second OLED layer formed on a window;

a solar cell formed on the second OLED layer; and

a first OLED layer formed on the solar cell.

2. The lighting device of claim 1, wherein the solar cell produces electricity from at least one of light emitted from the first OLED layer, light emitted from the second OLED layer, and external light.

3. The lighting device of claim 1, wherein the solar cell comprises a second solar cell formed on the second OLED layer and a first solar cell formed on the second solar cell, and a glass substrate is provided between the first solar and the second solar cell.

4. The lighting device of claim 3, wherein the glass substrate is an IZO glass layer or an ITO glass layer.

5. The lighting device of claim 3, further comprising:

a first buffer layer for passivating the first OLED layer, the first buffer layer being provided between the first solar cell and the first OLED layer; and

a second buffer layer for passivating the second OLED layer, the second buffer layer being provided between the second solar cell and the second OLED layer.

6. The lighting device of claim 1, wherein the second OLED layer is a light source for providing color coordinate transformation, and serves to control the transmissivity of external light or to reflect light emitted from the first OLED layer or other internally generated light.

7. The lighting device of claim 2, wherein the electricity produced by the solar cell is supplied to the first OLED layer or the second OLED layer.

8. The lighting device of claim 2, wherein the electricity produced by the solar cell is supplied to a battery.

9. A lighting device, comprising:

a solar cell formed on a window; and

an OLED layer formed on the solar cell.

10. The lighting device of claim 9, wherein the solar cell produces electricity from at least one of light emitted from the OLED layer and external light.

11. The lighting device of claim 9, further comprising:

a buffer layer for passivating the OLED layer, the buffer layer being provided between the solar cell and the OLED layer.

12. The lighting device of claim 9, wherein a reflecting plate is provided between the window and the solar cell, or a reflective material is applied on a surface of the solar cell which faces the window.

13. The lighting device of claim 10, wherein the electricity produced by the solar cell is supplied to the OLED layer.

14. The lighting device of claim 10, wherein the electricity produced by the solar cell is stored in a battery.