Illumination device for backlighting an image reproduction device
AssigneesSiemens Aktiengesellschaft, OSRAM Opto Semiconductors GmbH
InventorsGeorg Bogner, Patrick Kromotis, Ralf Mayer, Heinrich Noll
Life of this patent
Estimating the term…
Abstract
The invention relates to an illumination device for backlighting an image reproduction device that contains light valves. Said device is characterised in that light spots formed respectively by at least one light emitting diode are arranged in a grid on a thermally conductive support. The respective surface area of the light spots is less than that of the surface area defined by the grid.
Claims24
-21. (canceled)
An illumination device for backlighting an image reproduction device containing light valves, the illumination device comprising a flat thermally conductive carrier and a plurality of luminous spots arranged in a grid format on said carrier, each of said luminous spots having a plurality of light emitting diodes and a submount, each of said plurality of light emitting diodes of a respective one of said luminous spots being electrically insulated from the others of the light emitting diodes of the respective one of said luminous spots, said submounts exhibiting good thermal conductivity and connected to said carrier such that the connections between said submounts and said carrier exhibit good thermal conductivity.
The illumination device of claim 1, wherein the area of said submounts is less than the entire area covered by the grid on said carrier, said illumination device further comprising lines for supplying power to the light emitting diodes arranged between said submounts on an insulating carrier on that area of the carrier not occupied by submounts.
Dependencies are inferred from the claim text.