Abstract: A light source is disclosed. The light source has a light-emitting chip that includes an LED that generates light in an active region thereof. The LED emits a light signal in a forward direction, and infrared radiation generated in the active region is emitted in a side direction in the form of a first infrared signal. The first light signal is determined by a first drive signal coupled to the LED. The light source also includes an infrared detector positioned to collect a portion of the infrared signal. The infrared detector generates a heat signal indicative of the amount of infrared radiation detected. A controller generates the drive signal so as to maintain the heat signal at a first target value. In light sources having LEDs that emit in different spectral ranges, the infrared detectors can all detect heat in the same spectral range.

Abstract: A light source having a flexible light-generating module that includes a flexible circuit carrier, a plurality of light emitting dies, and a cover layer is disclosed. The flexible circuit carrier includes a sheet of flexible material having electrically conducting traces. The light emitting dies are electrically connected to the electrically conducting traces. The cover layer is constructed from a transparent, flexible material and covers the light emitting dies. The light-generating module can be attached to various surfaces to provide a light source that is non-planar as well as to surfaces that are piecewise planar. These more complex light sources can include garments that generate complex light patterns to call attention to the wearer and three-dimensional light sources. The light sources also provide improved heat-conduction and can be used to create non-rectangular back lights for displays.

Abstract: A light source is disclosed. The light source has a light-emitting chip that includes an LED that generates light in an active region thereof. The LED emits a light signal in a forward direction, and infrared radiation generated in the active region is emitted in a side direction in the form of a first infrared signal. The first light signal is determined by a first drive signal coupled to the LED. The light source also includes an infrared detector positioned to collect a portion of the infrared signal. The infrared detector generates a heat signal indicative of the amount of infrared radiation detected. A controller generates the drive signal so as to maintain the heat signal at a first target value. In light sources having LEDs that emit in different spectral ranges, the infrared detectors can all detect heat in the same spectral range.