Lumileds LLC

Lumileds Holding B.v.

Lumileds Singapore Pte. Ltd.

Ronald Johannes Bonne

Zhi Hua Song

Jyoti Kiron Bhardwaj

Tze Yang Hin

Udo Karbowski

Anantharaman Vaidyanathan

Srini Banna

Antonio Lopez Julia

Benno Spinger

Nazila Soleimani

Norbert Lesch

Dirk Vanderhaeghen

John Michael Cesaratto

Patrick Van Den Akker

Wouter Schrama

Nicola Bettina Pfeffer

Arjen Gerben Van Der Sijde

Toni Lopez

Isaac Wildeson

Pieter Johannes Quintus Van Voorst Vader

Michael Deckers

Zhihua Song

Marcus Hendrikus Adrianus Van Steen

Hossein Lotfi

Claire Yue Gao

David Christopher Jansson

Wan-Ying Sau

Lisheng Shi

Daniel Herrera

A lighting system and method of driving an array within the lighting system are disclosed. The array includes vertically-stacked multi-color micro light-emitting diode (microLED) devices that emit light of different colors. Driving circuits and a ground switching circuit are controlled by processing circuitry to sequentially emit the colors of each microLED by independently driving pn junctions of the microLED. Each driving circuit includes multiplexers to receive a sink/source current and selectably provide the sink/source current to a channel based on control signals from the processing circuitry. Dimming of a particular color is effected using a pulse width modulated (PWM) signal to adjust a duty cycle over which the sink/source current is applied to the channel. The ground switching circuit selects another channel using multiplexers, and grounds the channel such that current is limited to flowing through one of the pn junctions at a time.

Driving for multi-junction polychromic display devices

A light emitting diode (LED) device comprises a plurality of pixels on a backplane, each pixel comprising: semiconductor layers, which include an N-type layer, an active region, and a P-type layer; a cathode electrically contacting the N-type layer; an anode comprising anode segments electrically contacting respective portions of the P-type layer; one or more dielectric materials insulating: the active region and the P-type layer from the cathode, the anode segments from each other, and the anode segments from the cathode; and a plurality of interconnects, each respective interconnect affixing a respective anode segment to the backplane. Methods of making and use the devices are also provided.

Light emitting diodes with segmented anodes by pixel

An approach for controlling pixel turn on and turn off within an LED array is described. Turn-on delays for pixels within the LED array is based on the duty cycles of the pixels. The pixels are grouped based on corresponding duty cycles. The turn-on delay for each pixel is based on the group that includes the pixel, as well as position of the pixel within the group. The LED array is driven by circuitry in a CMOS backplane.

MicroLED array with adaptive PWM phase shift

A power supply system for a LED pixel array includes at least two power supplies respectively connectable to sub-arrays in a LED pixel array and providing adjustable power. A controller is connected to the at least two power supplies, with the controller able to make adjustments to the power supplied based on measured requirements of sub-arrays in the LED pixel array. In one embodiment, the LED pixel array is a microLED array.

Multiple power supply circuit for LED array

A LED controller for an LED pixel array includes an image frame buffer to receive image data and a standby image buffer connected to the image frame buffer to hold a standby image. A command and control module connected is configured to substitute the standby image in the standby image buffer for the image in the image frame buffer when image data is unavailable.

High speed image refresh system

Systems are described. A system includes a silicon backplane having a top surface, a bottom surface, and side surfaces and a substrate surrounding the side surfaces of the silicon backplane. The substrate has a top surface, a bottom surface and side surfaces. At least one bond pad is provided on the bottom surface of the substrate. A metal layer is provided on the bottom surface of the substrate and the bottom surface of the silicon backplane and has a first portion electrically and thermally coupled to the bottom surface of the silicon backplane in a central region and second portions that extend between a perimeter region of the silicon backplane and the at least one bond pad. An array of metal connectors is provided on the top surface of the silicon backplane.

Fan out structure for light-emitting diode (LED) device and lighting system

A camera is described that includes a first imager and a processor communicatively coupled to the first imager. The first imager captures images of a roadway on which a vehicle is located when operating. The processor, when operating, generates a signal to cause a first hybridized device in the vehicle to project a first patterned light on to an object on the roadway, generates a signal to cause the first imager to capture an image of the first patterned light projected on the object, receives the image from the first imager, and detects the object on the roadway based on the first patterned light captured in the image.

Vehicle camera vision and control system and method

A lighting system for a vehicle is described, which includes a first hybridized device, a second hybridized device and a controller. The first hybridized device includes a first array of light emitting devices that illuminate a roadway on which the vehicle is located when operating. The second hybridized device includes a second array of light emitting devices that illuminate the roadway on which the vehicle is located when operating. The controller is electrically coupled to the first and second hybridized devices. When operating, the controller causes the first hybridized device to selectively project a first patterned light on to an object on the roadway, causes the first hybridized device to selectively project a second patterned light on to the object on the roadway, and causes a first camera to capture an image of the first patterned light projected on the object and the second patterned light projected on the object.

Controllable headlamp system

A sensor can sense time-varying ambient light that is present in a scene to produce an ambient light signal. A processor can determine an ambient light frequency and an ambient light phase of the ambient light signal. Light-emitting diodes (LEDs) of an LED array can be electrically powered with pulse-width modulation (PWM) electrical signals having a same amplitude to produce illumination. Each LED can illuminate a respective region of the scene. Each PWM electrical signal can have a respective duty cycle that corresponds to a specified illumination intensity in a respective region of the scene. The PWM electrical signals can have a same PWM frequency that is an integral multiple of the ambient light frequency. Each PWM electrical signal can have a respective PWM phase that is synchronized to the ambient light phase. A lens can direct the illumination toward the scene to illuminate the scene.

Adaptive flash with pulse width modulation

A lighting system includes an LED array having a plurality of LED pixels and a power controller. The power controller adjusts a supply voltage for powering the LED pixels based on one or more conditions of the LED array. The power controller may determine the supply voltage based on process data of the LED array. The power controller may adjust the supply voltage based on an operating temperature of the LED pixels and the amplitude of a current driving the LED pixels.

Dynamically regulated micro-LED pixel array

A control system for an LED array relies on defining a first and a second group of separately addressed LED pixels, with the first group including pixels with an average current no less than the current at a Q point and a second group including pixels with an average current less than the current at a Q point. An amplitude signal provided to the first group of separately addressed LED pixels is selectively modulated, while providing a DC mode 100% duty cycle. An amplitude signal provided to the second group of separately addressed LED pixels is fixed, and a modulated duty cycle is provided.

Micro-LED amplitude control system

A method for control of a pixel array based on a temperature estimate is provided. A method includes sampling an anode voltage of each LED of a plurality of pixels resulting in sampled voltages, determining an average voltage based on the sample voltages, and determining a total voltage to provide to the pixels based on the average voltage and voltage data from a memory coupled to the controller, the voltage data including one or more of a 3-sigma value, a driver headroom value, a resistance value, or a k-factor value.

LED driver voltage accounting for temperature estimate

A vehicle headlamp system includes a vehicle supported power and control system including a data bus. A sensor module can be connected to the data bus to provide information related to environmental conditions or information relating to presence and position of other vehicles and pedestrians. A separate headlamp controller can be connected to the vehicle supported power and control system and the sensor module through the bus. The headlamp controller can include an image frame buffer that can refresh held images at greater than 30 Hz speed. An active LED pixel array can be connected to the headlamp controller to project light according to a pattern and intensity defined by the image held in the image frame buffer and a standby image buffer can be connected to the image frame buffer to hold a default image.

Adaptive headlamp system for vehicle

A LED controller for an LED pixel array includes a serial interface to an external data bus, along with an address generator connected to the serial interface and the LED pixel array. An image frame buffer is connected to the interface to receive image data and further connected to the address generator to receive an image frame buffer address. A command and control module is connected to the serial interface and configured to modify image frame buffer output signals. A calibration data storage module is connected to the command and control module to store calibration data related to pixel voltage response in the LED pixel array and enable modification of voltage provided by the dynamic power supply at least in part based on the image presented by the LED pixel array.

Growing community of inventors

Plainfield, IL, United States of America

Ronald Johannes Bonne