Illumination Device

• US 20100220046A1
• Filed: 12/15/2006
• Published: 09/02/2010
• Est. Priority Date: 12/16/2005
• Status: Active Grant

• Current Assignee: Optotronic GmbH (Inventronics (Hangzhou), Inc.)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Plötz, Ludwig, Lang, Kurt-Jürgen, Stoyan, Harald, Kraus, Robert, Sailer, Michael, Zeiler, Markus
• Granted Patent: US 8,593,390 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 4/24 of ribbon or tape form, e.g. LED tapes
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: H05K 1/142 Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/055 Folded back on itself
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20

Abstract

An illumination device comprises at least one light module (1) wherein the light module (1) comprises a circuit board (2) to which a plurality of groups (30) of light sources (3a, 3b, 3c) are applied and a carrier (6) on which the light module (1) is fixed, is specified. A display apparatus comprising such an illumination device is also disclosed.

Claims

1. An illumination device comprising:

at least one light module wherein the light module comprises a circuit board to which a plurality of groups of light sources are applied, and

a carrier on which the light module is fixed.

2. The illumination device as claimed in claim 1,

wherein at least one of the light sources comprises a light emitting diode.

3. The illumination device as claimed in claim 2, wherein the light emitting diode comprises a light emitting diode chip provided for generating radiation and an optical element which has an optical axis,

wherein the optical element has a radiation exit area, and

wherein the radiation exit area has a concavely curved partial region and a convexly curved partial region, which at least partly surrounds the concavely curved partial region at a distance from the optical axis, wherein the optical axis runs through the concavely curved partial region.

4. The illumination device as claimed in claim 3,

wherein the light emitting diode chip is formed by a thin-film light emitting diode chip.

5. The illumination device as claimed in claim 1,

wherein the circuit board is formed by a flexible circuit board.

6. The illumination device as claimed in claim 1,

wherein at least one light module has at least one fold.

7. The illumination device as claimed in claim 1

wherein the circuit board of at least one light module has at least one incision.

8. The illumination device as claimed in claim 1,

wherein the incision extends along at least 70% of the length of the circuit board of the light module.

9. The illumination device as claimed in claim 1

wherein the light module is expanded in a direction running transversely with respect to the incision.

10. The illumination device as claimed in claim 1

wherein a heat conducting element is applied to that side of the circuit board of the light module which is remote from the light sources.

11. The illumination device as claimed in claim 1, wherein a plurality of light modules are arranged in lines on the carrier.

12. The illumination device as claimed in claim 1,

wherein at least one light module comprises a control device, which is suitable for controlling an operating current through the light sources.

14. The illumination device as claimed in claim 1,

wherein the control device is arranged on that side of the carrier which is remote from the light sources.

15. A display apparatus comprising:

an imaging unit; and

a backlighting device for the imaging unit, which is formed by an illumination device as claimed in claim 1.

16. The display apparatus as claimed claim 15,

wherein the imaging unit comprises an LCD panel and the LCD panel is arranged parallel to the circuit board of at least one of the light modules.

13. The illumination device as claimed in claim 13,

wherein the control device is adapted for regulating an operating current through the light sources depending on measured values determined by a sensor.