Lumileds LLC

Varun Dev Kakkar

Erno Fancsali

Nicola Bettina Pfeffer

Rob Jacques Paul Engelen

Frans Hubert Konijn

Chunxia Feng

Emanuel Nicolaas Hermanus Johannes Stassar

Arjen Gerben Van Der Sijde

Charles André Schrama

Charles Schrama

Rob Engelen

Hugo Johan Cornelissen

Toni Lopez

Venkata Ananth Tamma

Giovanni Cennini

Mehdi Aas

The output spectrum of a light emitting device comprising LEDs and/or pcLEDs is tunable by controlling emission from an activating LED to activate absorption by a photochromic material in the light output optical path of the device, or to induce emission from a wavelength converting material not otherwise active during operation of the light emitting device, or to activate absorption by a photochromic material in the light output optical path of the device and to induce emission from a wavelength converting material not otherwise active during operation of the light emitting device.

Color tunable light emitting devices

The invention describes a light emitting diode array module () comprising a plurality of light emitting diode structures (), wherein the light emitting diode structures () are arranged such that there is an optical cross talk between the light emitting diode structures () during operation of the light emitting diode array module (), wherein at least a first light emitting diode structure () of the plurality of light emitting diode structures () is characterized by a first color, and wherein at least a second light emitting diode structure () of the plurality of light emitting diode structures () is characterized by a second color different than the first color, wherein the first color, the second color and the optical cross talk between the light emitting diodes are arranged to provide a predefined light distribution in a reference plane () perpendicular to an optical axis () of the light emitting diode an-ay module (). The invention further describes a lighting device comprising one or more LED array modules ().

LED array module

A light emitting device comprises a plurality of coherent light sources, and a plurality of light scattering structures. Each light scattering structure is located in an optical path for light output from a different corresponding one of the coherent light sources. Each light scattering structure comprises an arrangement of nanoantennas embedded in an electrically responsive material and electrical contacts by which to apply a voltage to the electrically responsive material. Application of a time varying electrical signal causes the refractive index of the electrically responsive material in a light scattering structure to vary and thereby varies light scattering by the nanoantennas in the light scattering structure. This effect may be used to reduce speckle caused by interference of light output by the coherent light sources.

Speckle reduction in VCSEL arrays

Systems, methods and devices are for optical imaging are described. A system includes a light source and a light detection unit. The light source includes a light-emitting device and a first spectral filter opposite the light emitting device. The first spectral filter includes at least one dielectric filter and has a first angular dependence of a transmission passband. The light source further includes at least one reflector adjacent side surfaces of the light emitting device. The light detection unit includes an optical sensor and a second spectral filter opposite the optical sensor. The second spatial filter has a second angular dependence of a transmission passband that is matched to the first angular dependence.

System for optical imaging comprising matched spectral filters

An apparatus projecting light onto a projection surface comprises: a substrate having disposed thereon two or more LED clusters and two or more micro-lenses, each LED cluster comprising a plurality of LEDs and each of the micro-lenses being disposed the plurality of LEDs. Each of the LED clusters is arranged to emit light through each of the micro-lenses in a pattern of dots. A center of at least one LED cluster is off-set from an optical center of the micro-lens of its LED cluster. A projected image includes arrangements of individual dots and/or areas of smooth light resulting from the pattern of dots.

Miniature pattern projector using microLEDs and micro-optics

The invention refers to a lighting device comprising at least one light emitting diode (LED). The object to provide a lighting device that is capable of providing a light pattern for illuminating an object in 3D imaging, wherein the lighting device is simple and cost-effective to manufacture, while the lighting device may in addition have a very small form factor, is solved in with a lighting device comprising: at least one LED for emitting light towards a light-emitting side; a first grating with a regular pitch having light-blocking sections and light-permeable sections; wherein the first grating is arranged on the light-emitting side to block the passage of light at the light-blocking sections, such that the light passing the light-permeable sections is capable to illuminate an object with a line pattern. The invention further corresponds to a method for producing a lighting device and the use of a lighting device.

Lighting device comprising LED and grating

A lighting system is described that includes a first lighting device, a second lighting device and a pattern element. The first lighting device includes at least one individual light-emitting element configured to emit light with a first beam profile. The second lighting device includes at least one individual light-emitting element configured to emit light with a second beam profile such that a third beam profile, different from the first beam profile and the second beam profile, is provided as a combination of the first beam profile and the second beam profile. The pattern element is configured to generate a pattern on at least one of the first beam profile and the second beam profile and a pattern on the third beam profile.

Lighting system with pattern element

A thin plastic light guide is formed to have cavities on one surface and TIR (total internal reflection) structures directly above the cavities. LEDs mounted on a printed circuit board are positioned hi the cavities. The cavity walls are shaped to refract the LED light and direct the LED light toward the TIR structures to most efficiently make use of the TIR structures. The TIR structures may have a cusp or cone shape. The top ceiling of the cavities may be shaped to direct light at the TIR structure so as to leak through the TIR structure and blend the light with light leaking through surrounding portions of the light guide. The LEDs may be distributed only near the edges of the light guide or over the entire back surface of the light guide. A diffuser sheet may be laminated over the light guide to further mix the light.

Illumination structure including cavity and TIR structure

The invention describes a method () for counterfeit detection using a portable device () with installed counterfeit detection application, to a data carrier () comprising this counterfeit detection application, to the portable device () used in this method and to a cover () comprising guiding structures to perform this method comprising the steps of taking multiple overlapping pictures () from at least a portion of the object () with the camera () of the portable device () positioned in front of the object () during relatively moving (RM) the portable device with respect to and () along the object (); combining () all taken pictures to a single combined image of at least the portion of the object () with increased resolution by the counterfeit detection application () executed on the portable device (); applying image processing () to the combined image by the counterfeit detection application () providing an improved image with improved properties compared to the combined image to order to visualize or enhance the hidden features of the object () comprising an increased contrast in the infrared and/or ultraviolet wavelength range being transmitted by the adapted band pass filter (); and comparing () the improved image with the visualized or enhanced hidden features of the object () with a reference image of the object () comprising the hidden features by the counterfeit detection application () to provide () an authentication result for the performed counterfeit detection.

Counterfeit detection in bright environment

A device includes a light-emitting device (LED) having at least two vertical light-emitting sides, and a ring-shaped light guide having a bottom side, a top side comprising a light-emitting surface, an inner sidewall, and an outer sidewall defining an indentation having at least two vertical in-coupling surfaces mated to the at least two vertical light-emitting sides of the LED.

Illumination device with light guide having angled light-accepting surfaces

A thin plastic light guide is formed to have cavities on one surface and TIR (total internal reflection) structures directly above the cavities. LEDs mounted on a printed circuit board are positioned in the cavities. The cavity walls are shaped to refract the LED light and direct the LED light toward the TIR structures to most efficiently make use of the TIR structures. The TIR structures may have a cusp or cone shape. The top ceiling of the cavities may be shaped to direct light at the TIR structure so as to leak through the TIR structure and blend the light with light leaking through surrounding portions of the light guide. The LEDs may be distributed only near the edges of the light guide or over the entire back surface of the light guide. A diffuser sheet may be laminated over the light guide to further mix the light.

Molded light guide for optically coupling light from LEDs

Uniform, efficient, and color tunable ring flash for camera using LEDs with light emission from multiple sides

Described herein is source sensitive optic that uses reconfigurable chip-on-board (CoB) light emitting diode (LED) arrays as light sources. In an implementation, the reconfigurable CoB LED array includes a predetermined number of LEDs that are configurable for a variety of illumination scenarios. In an implementation, the reconfigurable CoB LED array is multiple CoB LED arrays that are configured for use with the source sensitive optic as described herein. The source sensitive optic includes surface shapes that are responsive to the reconfigurable CoB LED array. The source sensitive optic is configured to provide beam profile and radiation pattern differentiation based on a CoB LED array configuration configured from the reconfigurable CoB LED. Each configurable CoB LED array configuration radiates a different beam pattern via the surface shapes due to proximity and surface shape geometries.

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Eindhoven, Netherlands

Varun Dev Kakkar