A light-emitting diode (LED) driver configured to generate an LED driving current based on an input signal may include a terminal exposed to outside, a controller configured to identify a first identifier and data from the input signal, identify a second identifier based on a signal applied to the terminal, and when the first identifier and the second identifier are identical to each other, generate a control signal based on the data. The LED driver further may further include a current source configured to generate the LED driving current based on the control signal.

A system including a lighting controller and a radio adapter. The lighting controller includes a smart port and is configured to control at least one lighting fixture. The radio adapter is communicatively coupled to the lighting controller via the smart port. The radio adapter is configured to establish a wireless communication link between the lighting controller and an external device, communicatively couple the external device to the lighting controller via the smart port, and provide a master clock timing signal to the lighting controller via the smart port.

An LED display driven by a dual-negative-voltage power supply is provided. The LED display includes a power supply interface and a display module. The power supply interface includes a first electrode, a second electrode, and a third electrode. The display module includes a substrate, the substrate is provided with a connection terminal having a first port, a second port, and a third port. The first electrode is coupled with the first port via a first wiring harness. The second electrode is coupled with the second port via a second wiring harness. The third electrode is coupled with the third port via a third wiring harness. A potential difference between the first electrode and the second electrode provides a first voltage. A potential difference between the first electrode and the third electrode provides a second voltage. The display module is configured to be powered with the first and second voltages.

A semiconductor light-emitting device includes a junction between doped semiconductor layers, a first set of multiple independent contacts connected to a first doped layer and a second set of one or more contacts connected to the second doped layer. Multiple conductive vias connect the independent contacts to the first doped layer, enabling differing corresponding via currents to be applied to the first doped layer through the vias independent of one another. A spatial distribution of via currents among the multiple vias can be selected to yield a corresponding spatial distribution of emission intensity. Alteration of the via current distribution results in corresponding alteration of the emission intensity distribution; such alterations can be implemented dynamically. Multiple devices can be arranged as a light-emitting array.

A semiconductor light-emitting device includes a junction between doped semiconductor layers, a first set of multiple independent contacts connected to a first doped layer and a second set of one or more contacts connected to the second doped layer. Multiple conductive vias connect the independent contacts to the first doped layer, enabling differing corresponding via currents to be applied to the first doped layer through the vias independent of one another. A spatial distribution of via currents among the multiple vias can be selected to yield a corresponding spatial distribution of emission intensity. Alteration of the via current distribution results in corresponding alteration of the emission intensity distribution; such alterations can be implemented dynamically. Multiple devices can be arranged as a light-emitting array.

An example circuit includes a substrate having a surface and electrically conductive lines. The electrically conductive lines extend in a direction substantially parallel to the surface and substantially orthogonal to a virtual centerline. The circuit also includes first and second instances of a driver device having respective first and second sides, and respective line outputs. The line outputs are arranged along the first side of the respective instance of the driver device, and the respective first side of each of the first and second instances of the driver device are nearer the virtual centerline than the second side thereof. The line outputs of the first instance of the driver device are coupled to a first set of the electrically conductive lines, and the line outputs of the second instance of the driver device are coupled to a second set of the electrically conductive lines.

An example circuit includes a substrate having a surface and electrically conductive lines. The electrically conductive lines extend in a direction substantially parallel to the surface and substantially orthogonal to a virtual centerline. The circuit also includes first and second instances of a driver device having respective first and second sides, and respective line outputs. The line outputs are arranged along the first side of the respective instance of the driver device, and the respective first side of each of the first and second instances of the driver device are nearer the virtual centerline than the second side thereof. The line outputs of the first instance of the driver device are coupled to a first set of the electrically conductive lines, and the line outputs of the second instance of the driver device are coupled to a second set of the electrically conductive lines.

LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

A tube lamp including a light source including at least one string of light emitting diodes within a tube body; end caps having pin contacts on each end of the tube body; and driver electronics including a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture. The tube lamp may also include a switch for selecting light characteristics for light emitted by the light source.