Abstract: An illumination module includes a longitudinal support member including a base portion and a pair of sidewalls extending from the base portion that together define a channel that extends in a longitudinal direction. A printed circuit board (PCB) on the base portion extends in the longitudinal direction within the channel. A plurality of light emitting diodes (LEDs) are on the PCB in a linear array. A reflective sheet is within and extends across the channel, and includes a plurality of holes that correspond with locations of the LEDs on the PCB, and the LEDs are positioned in the holes. An optical film extends across the channel above the reflective sheet and defines an optical cavity between the reflective sheet and the optical film. The optical film, the reflective sheet and the sidewalls of the support member recycle light in the optical cavity.

Abstract: Provided are devices and methods for grouping light emitters and devices including the same. Embodiments of such methods may include selecting a portion of the light emitters using a region of a multiple axis color space that is configured to represent each of a plurality of colors as at least two chromaticity coordinates. The region may be proximate a predefined point on the multiple axis color space and includes a major axis having a first length and a minor axis having a second length that is less than the first length.

Abstract: Methods of calibrating a lighting panel including a plurality of segments, each of said segments configured to emit a first color light and a second color light in response to pulse width modulation control signals having respective duty cycles include determining an average segment luminance for the lighting panel, determining a luminance variation of each segment to the average segment luminance, comparing the luminance variation of each segment to a threshold, and adjusting the duty cycle of at least one color of at least one segment to reduce the luminance variation in response to the luminance variation of a segment exceeding the threshold. Calibration systems are also disclosed.

Abstract: Provided are devices and methods for grouping light emitters and devices including the same. Embodiments of such methods may include selecting a portion of the light emitters using a region of a multiple axis color space that is configured to represent each of a plurality of colors as at least two chromaticity coordinates. The region may be proximate a predefined point on the multiple axis color space and includes a major axis having a first length and a minor axis having a second length that is less than the first length.

Abstract: An illumination module includes a longitudinal support member including a base portion and a pair of sidewalls extending from the base portion that together define a channel that extends in a longitudinal direction. A printed circuit board (PCB) on the base portion extends in the longitudinal direction within the channel. A plurality of light emitting diodes (LEDs) are on the PCB in a linear array. A reflective sheet is within and extends across the channel, and includes a plurality of holes that correspond with locations of the LEDs on the PCB, and the LEDs are at least partially within the holes. An optical film extends across the channel above the reflective sheet and defines an optical cavity between the reflective sheet and the optical film.

Abstract: Provided are solid state lighting devices that include multiple solid state light emitters that are configured to emit light and a multiplane light diffuser including a first diffusion plane and a second diffusion plane that are separated by a gap, the multiplane light diffuser including first side that is configured to receive the light emitted from the solid state light emitters and a second side that is configured to transmit diffused light.

Abstract: A solid state lighting unit includes a plurality of solid state lighting tiles including a planar surface and a plurality of solid state light sources on the planar surface. The lighting unit includes a plurality of bar support members. Respective ones of the bar support members include at least two of the plurality of tiles affixed thereon to form respective bar assemblies, and respective ones of the solid state light sources on the solid state lighting tiles of a bar assembly are electrically connected in series so as to be simultaneously energized upon application of a voltage thereto. Methods of forming a solid state lighting unit are also disclosed.

Abstract: A solid state lighting tile includes a substrate and a plurality of lighting element clusters on a surface of the substrate. Respective ones of the plurality of lighting element clusters include first and second mounting positions configured to receive solid state light emitting devices, and at least first and second ones of the solid state lighting element clusters may be electrically connected in series. The tile further includes a plurality of solid state light emitting devices configured to emit a first color light, and respective ones of the solid state light emitting devices may be mounted in respective ones of the plurality of solid state lighting element clusters. One of the first color light emitting devices is mounted in the first mounting position of the first solid state lighting element cluster and a second of the first color light emitting devices is mounted in the second mounting position of the second solid state lighting element cluster.

Abstract: A solid state lighting unit includes a plurality of solid state lighting tiles including a planar surface and a plurality of solid state light sources on the planar surface. The lighting unit includes a plurality of bar support members. Respective ones of the bar support members include at least two of the plurality of tiles affixed thereon to form respective bar assemblies, and respective ones of the solid state light sources on the solid state lighting tiles of a bar assembly are electrically connected in series so as to be simultaneously energized upon application of a voltage thereto. Methods of forming a solid state lighting unit are also disclosed.

Abstract: An edge-lit backlight unit for displays is provided. In one embodiment, the backlight may include a light guide configured to receive light from a light source along a first lateral edge. The received light propagates towards a second opposite lateral edge. The backlight unit may include an arrangement of light-extracting elements configured to extract a portion of the propagating light and to allow the remaining portion to reach the second edge. In one embodiment, a specular reflector disposed at the second edge causes the light reaching the second edge to retro-propagate back towards the first edge. In certain embodiments, the retro-propagating light may be between approximately 5 to 35 percent of the total light received by the light guide. The retro-propagating light may be extracted by multiple light-extracting elements and mixed with the extracted propagating light to provide improved color uniformity along an axis of the display.

Abstract: A lighting panel system includes a lighting panel including a first string of solid state lighting devices configured to emit light at a first wavelength and a second string of solid state lighting devices configured to emit light at a second wavelength, different from the first wavelength, and a current supply circuit configured to supply a drive current to the first string in response to a control signal. A photosensor is arranged to receive light emitted by the panel, and a control system is configured to sample an output signal of the photosensor and adjust the control signal responsive thereto to thereby adjust an average current supplied to the first string by the current supply circuit. Methods of operating a lighting panel are also provided.

Abstract: Systems, methods, and devices are provided for maintaining a target white point on a light emitting diode (LED) based backlight. In one embodiment, the backlight may include two or more groups of LEDs, each driven at a respective driving strength. Each group may include LEDs of a different chromaticity, and the respective driving strengths may be adjusted, for example, by varying the duty cycles, to maintain the target white point. To ensure that the white point may be maintained over an operational temperature range of the backlight, the LEDs may be selected so that the chromaticities of each group of LEDs are separated by at least a minimum chromaticity difference. Further, the LEDs may be selected so that at the equilibrium temperature of the backlight, the LEDs may produce the target white point when driven at substantially equal driving strengths.

Abstract: Provided are solid state lighting devices and methods for forming the same. A solid state lighting tile according to some embodiments of the invention includes a substrate, a solid state lighting element mounted on a surface of the substrate, and a reflector sheet on the surface of the substrate. A method of forming a solid state lighting device according to some embodiments of the invention includes providing a substrate of a solid state lighting tile, mounting a solid state lighting element on a surface of the substrate, and attaching a reflector sheet to the surface of the substrate.

Abstract: An illumination module includes a longitudinal support member including a base portion and a pair of sidewalls extending from the base portion that together define a channel that extends in a longitudinal direction. A printed circuit board (PCB) on the base portion extends in the longitudinal direction within the channel. A plurality of light emitting diodes (LEDs) are on the PCB in a linear array. A reflective sheet is within and extends across the channel, and includes a plurality of holes that correspond with locations of the LEDs on the PCB, and the LEDs are at least partially within the holes. An optical film extends across the channel above the reflective sheet and defines an optical cavity between the reflective sheet and the optical film.

Abstract: Provided are methods and apparatus for combining light emitters and devices including the same. Embodiments include methods of selecting combinations of multiple light emitters that are grouped into multiple bins. The multiple bins correspond to multiple emitter group regions in a multiple axis color space and multiple luminosity ranges. Such methods may include prioritizing multiple combinations of light emitters from at least two of the bins, each of the combinations including chromaticity values corresponding to a desired color region and a luminosity value corresponding to a specified luminosity range.

Abstract: Provided are solid state lighting devices that include multiple solid state light emitters that are configured to emit light and a multiplane light diffuser including a first diffusion plane and a second diffusion plane that are separated by a gap, the multiplane light diffuser including first side that is configured to receive the light emitted from the solid state light emitters and a second side that is configured to transmit diffused light.

Abstract: A packaged LED device having a textured encapsulant that is conformal with a mount surface on which at least one LED chip is disposed. The textured encapsulant, which can be textured using an additive or subtractive process, is applied to the LED either prior to or during packaging. The encapsulant includes at least one textured surface from which light is emitted. The textured surface helps to reduce total internal reflection within the encapsulant, improving the extraction efficiency and the color temperature uniformity of the output profile. Several chips can be mounted beneath a single textured encapsulant. A mold having irregular surfaces can be used to form multiple encapsulants over many LEDs simultaneously.

Abstract: Provided are devices and methods for providing front-of screen uniformity. Methods include estimating a filter function corresponding to the display and selecting multiple light emitters as a function of characteristics corresponding to light transmitted from the display as determined via the filter function. Devices are provided that include multiple light emitters including a first chromaticity difference corresponding to the multiple light emitters and a second chromaticity difference corresponding to the multiple light emitters and a filter function, wherein the second chromaticity difference is less than the first chromaticity difference.

Abstract: Provided are devices and methods for grouping light emitters and devices including the same. Embodiments of such methods may include selecting a portion of the light emitters using a region of a multiple axis color space that is configured to represent each of a plurality of colors as at least two chromaticity coordinates. The region may be proximate a predefined point on the multiple axis color space and includes a major axis having a first length and a minor axis having a second length that is less than the first length.