Cree Gmbh

Creeled, Inc.

Ideal Industries Lighting LLC

Cree Huizhou Solid State Lighting Company Limited

Christopher P Hussell

David T Emerson

Jesse Colin Reiherzer

Peter Scott Andrews

John Adam Edmond

Sung Chul Joo

Michael John Bergmann

Praneet Jayant Athalye

Brian Thomas Collins

Gerald H Negley

Erin R F Welch

Antony Paul Van De Ven

Curt Progl

Mark D Edmond

Paul Kenneth Pickard

James Michael Lay

Bart P Reier

Peter E Lopez

Charles M Swoboda

Florin A Tudorica

Shuying Huang

Joseph Gates Clark

Erin Welch

Kurt S Wilcox

Ronan P Le Toquin

Jeffrey Carl Britt

Matthew Donofrio

Ban Poh Loh

Colin Kelly Blakely

Shaow B Lin

Bernd P Keller

Eric J Tarsa

Sten Heikman

John Wesley Durkee

Amber Christine Abare

David N Randolph

Craig William Hardin

Jeremy Johnson

Mark Cash

Zhenyu Zhong

Barry Rayfield

James D Sievert

Ed Adams

Boris Dzyubenko

James Ibbetson

Theodore D Lowes

Joseph P Chobot

Zongjie Yuan

Andrew Dan Bendtsen

John J Trainor

Tao Tong

Raymond Rosado

Matthew Brian Deese

Ronan Letoquin

Hormoz Benjamin

Zhimin Jamie Yao

Amber Christine Salter

Keith Bryan

Brian Carrigan

Arthur Fong-Yuen Pun

Yue Kwong Victor Lau

Chak Hau Charles Pang

JuZuo Sheng

Fan Zhang

Alan Wellford Dillon

Peter Guschl

Andrew Signor

Harry A Seibel, Ii

Justin Lydon

Robert S Pyles

Ronan P Letoquin

Active control of LEDs, LED packages, and related LED displays by way of pulse wide modulation (PWM) is disclosed. Effective PWM frequencies for LEDs are increased by segmenting duty cycles in which LEDs are electrically activated within individual PWM periods. Segmented duty cycles may be provided by transforming or re-ordering a sequence in which control signals are provided to LEDs. As such, LEDs may be electrically activated and deactivated multiple times within each PWM period. Active electrical elements that are incorporated into one or more LED packages of an LED display may be capable of segmenting the duty cycle within each LED package. Active electrical elements may also be capable of receiving reset signals from a data stream to either initiate a reset action or pass the reset signals along to other active electrical elements of a display.

Active control of light emitting diodes and light emitting diode displays

Light-emitting devices and, more particularly, light-emitting devices with pseudo-exponential encoding and related methods are disclosed. Pseudo-exponential encoding or pseudo-exponential transformation refers to encoding and decoding techniques that include placement of certain data bits while at least one data bit is introduced in a manner that deviates from exponential transformation. The deviation involves introducing the at least one data bit to avoid duplicate zero values that may otherwise be present during decoding. Exemplary light-emitting devices include light-emitting diode (LED) packages and/or LED displays. Pseudo-exponential encoding as described herein provides bit shifting and manipulation for increased dynamic range with reduced complexity and size of hardware resources.

Pseudo-exponential encoding for light-emitting devices and related methods

Light-emitting diode (LED) packages and, more particularly, LED packages with transformation and shifting of pulse width modulation (PWM) signals and related methods are disclosed. Discrete LED packages are arranged for cascade communication. Each LED package includes one or more LED chips, and each LED package is separately capable of receiving communication from a data stream, controlling operation of the one or more LED chips, and performing transformation and shifting of received PWM signals. Transformation may include compression and/or decompression of received PWM signals by each LED package to provide increased accessible dynamic range. After transformation, LED packages are capable of shifting transformed values to compensate for turn-on delay of LED chips, thereby reducing light drop-off problems at low intensity levels.

Light-emitting diode packages with transformation and shifting of pulse width modulation signals and related methods

Mixed clock domain signaling and, more particularly, mixed clock domain signaling for light-emitting diode (LED) packages arranged for cascade communication is disclosed. Mixed clock domain signaling involves digital communication where time-positions of bit pulse edges in a communication channel are derived from multiple uncorrelated clock domains, including an original clock domain from a master controller and a local clock domain. In the context of LED displays, serial strings of LED packages are arranged as LED pixels to receive cascade communication signals, and the original clock domain is derived from a master controller and a local clock domain is derived at each LED package. By providing for the bit period to be maintained and correlated to the original clock domain throughout the repeated cascade communication, problems associated with multiple uncorrelated clock domains in the communication channel, such as sampling jitter, may be averted, thus avoiding loss of data integrity.

Light-emitting diodes with mixed clock domain signaling

Light emitting diode (LED) devices, methods and systems are provided. An example apparatus can include an underfill layer separate from a bonding layer. The apparatus can further include a dark encapsulating layer comprising an epoxy-molded compound which is applied using a powder-coating process. A method for providing a powder-coated encapsulation and for producing an LED panel with such an encapsulant is disclosed.

Light emitting diodes and methods

Solid state lighting apparatuses, systems, and related methods are provided. An example apparatus can include one or more light emitting diodes (LEDs) and a dark or black encapsulation layer surrounding and/or disposed between the one or more LEDs. The apparatus can include, e.g., a substrate or a leadframe for mounting the LEDs. A method for producing a panel of LEDs can include joining the LEDs to the panel, e.g., by bump bonding, and flooding the panel with dark or black encapsulation material so that the LED chips are surrounded by the dark or black encapsulation material.

Light emitting diodes and methods with encapsulation

Active control of light emitting diodes (LEDs) and LED packages within LED displays is disclosed. LED packages are disclosed that include a plurality of LED chips that form at least one LED pixel for an LED display. Each LED package may include an active electrical element that is configured to receive a control signal and actively maintain an operating state, such as brightness or grey level while other LED packages are being addressed. Active electrical elements may include active circuitry that includes one or more of a driver device, a signal conditioning or transformation device, a memory device, a decoder device, an electrostatic discharge (ESD) protection device, a thermal management device, and a detection device, among others. In this regard, each LED pixel of an LED display may be configured for operation with active matrix addressing.

Active control of light emitting diodes (LEDs) and LED packages within LED displays is disclosed. LED packages are disclosed that include a plurality of LED chips that form at least one LED pixel for an LED display or an LED panel. Each LED package may include an active electrical element that is configured to receive a control signal and actively maintain an operating state, such as brightness or grey level while other LED packages are being addressed. The control signal may be provided in a data stream that includes a plurality of data packets. Each data packet may include an identifier that enables each LED package of an array that receives the data packet to take one or more actions based on the identifier or a series of identifiers.

Synchronization for light emitting diode (LED) pixels in an LED display is provided so that one or more actions of all LED pixels are able to be initiated at the same time, or within a millisecond. LED displays and corresponding systems may include a controller that is configured for sending communication signals to one or more strings of LED pixels. Active electrical elements within each LED pixel may be configured to receive the communication signals, generate corresponding synchronization signals, and respond in a manner that is coordinated with all other LED pixels in a particular LED display. Failure mitigation of LED pixel failures within an LED string is provided where the controller is configured with bidirectional communication ports for communication with the LED string. In a failure mitigation process, the bidirectional communication ports may switch directions to provide communication signals to both sides of an LED string.

An LED wafer includes LED dies on an LED substrate. The LED wafer and a carrier wafer are joined. The LED wafer that is joined to the carrier wafer is shaped. Wavelength conversion material is applied to the LED wafer that is shaped. Singulation is performed to provide LED dies that are joined to a carrier die. The singulated devices may be mounted in an LED fixture to provide high light output per unit area.

Wafer level packaging of light emitting diodes (LEDs)

Active control of light emitting diodes (LEDs) and LED packages within LED displays is disclosed. LED packages are disclosed that include a plurality of LED chips that form at least one LED pixel for an LED display or an LED panel. Each LED package may include an active electrical element that is configured to receive a control signal and actively maintain an operating state, such as brightness or grey level while other LED packages are being addressed. Active electrical elements are disclosed that are configured to provide both forward and reverse bias states to LEDs to detect adverse operating conditions including reverse leakage and deviations to forward voltage levels. LED packages are also disclosed that may self-configure based on the manner in which various input or output lines are connected.

An area lamp includes an emitter array and driver circuitry. The emitter array includes a number of solid-state light emitters. Each one of the solid-state light emitters is configured to provide light suitable for general illumination within a field of view such that light emitted from a first subset of the number of solid-state light emitters is provided to a different portion of the field of view than light emitted from a second subset of the number of solid-state light emitters. The driver circuitry is coupled to the emitter array and configured to provide drive signals to the emitter array such that the light provided from each one of the solid-state light emitters is independently controllable and a number of drive signals is less than the number of solid-state light emitters.

Enhanced fixtures for area lighting

Growing community of inventors

Cary, NC, United States of America

Christopher P Hussell