Backlighting arrangement with semiconductor light sources arranged in light groups and lighting device

• US 7,740,365 B2
• Filed: 09/04/2006
• Issued: 06/22/2010
• Est. Priority Date: 09/03/2005
• Status: Expired due to Fees

• Current Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Hüttner, Josef, Wanninger, Mario, Ott, Hubert
• Primary Examiner(s): Lee; Gunyoung T
• Application Number:
  US12/065,053
• Publication Number:
  US 20080239718A1
• Time in Patent Office: 1,387 Days
• Field of Search: 362/97.3, 362/249.02, 362/231, 362/555, 362/561, 362/97.1, 362/97.2, 362/97.4, 362/800, 349 61- 71
• US Class Current: 362/97.3
• 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: F21V 5/007 Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane combination of two or more refractors F21V5/008
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

This invention relates to uniform backlighting of surfaces by semiconductor light sources. Various semiconductor light sources are combined into identical illumination groups. These identical illumination groups are arranged so that uniform backlighting of a surface is made possible. For homogeneous color mixing to be achieved, especially at edges, each illumination group in the arrangement has at least one adjacent illumination group in a different orientation.

Claims

1. A backlighting arrangement comprising:

a plurality of identical illumination groups, in which

each illumination group has at least one adjacent illumination group with a different orientation,

each illumination group is a radiation-emitting semiconductor component that has a plurality of semiconductor chips,

at least two of the semiconductor chips provide different colors or color contributions,

each illumination group has at least one red light-emitting semiconductor chip, at least one green light-emitting semiconductor chip, and at least one blue light-emitting semiconductor chip,

at least two adjacent illumination groups in each case are rotated relative to one another by 90 or 180 degrees with respect to an imaginary axis along their principal direction of radiation,

a plurality of illumination groups are attached to a first strip-shaped carrier and other illumination groups are attached to a second strip-shaped carrier adjacent to the first carrier, with the first and second carriers being arranged antiparallel to one another.

2. Backlighting arrangement pursuant to claim 1, characterized by the fact that each illumination group has a plurality of semiconductor chips in identical arrangement.

3. Backlighting arrangement pursuant to claim 2, characterized by the fact that the semiconductor chips are light emitting diodes.

4. Backlighting arrangement pursuant to claim 2, characterized by the fact that the semiconductor chips of different colors or color contributions separately controllable.

5. Backlighting arrangement pursuant to claim 1, characterized by the fact that the semiconductor chips are individually controllable.

6. Backlighting arrangement pursuant to claim 1, characterized by the fact that the illumination groups are arranged in a regular grid arrangement.

7. Backlighting arrangement pursuant to claim 6, characterized by the fact that the grid arrangement contains a grid structure that in turn contains a hexagon, rhombus, rectangle, or parallelogram.

8. Backlighting arrangement pursuant to claim 1, characterized by the fact that the illumination groups of the first strip-shaped carrier are attached to said carrier in the same orientation.

9. Backlighting arrangement pursuant to claim 1, characterized by the fact that the carrier is a printed circuit board.

10. Illumination device that has a backlighting arrangement pursuant to claim 1 and that has an optical element.

11. Illumination device pursuant to claim 10, wherein the light emitted by the backlighting arrangement passes through the optical element.

12. Illumination device pursuant to claim 10, wherein the illumination device is a display device.

13. Illumination device pursuant to claim 12, wherein the optical element has the property of providing information.

14. Illumination device pursuant to claim 12, wherein the optical element is a liquid crystal display.

15. Illumination device pursuant to claim 10, wherein the illumination device is a lighting device.

16. Illumination device pursuant to claim 15, wherein the optical element has light-mixing properties.

17. Illumination device pursuant to claim 16, wherein the optical element is a diffuser.

18. Illumination device pursuant to claim 15, wherein the optical element has light-aligning properties.

19. Illumination device pursuant to claim 18, wherein the optical element is a BE (Brightness Enhancement) film.

20. Illumination device pursuant to claim 19, wherein the BE (Brightness Enhancement) film is a prismatic film.