Abstract: An LED or microLED light source with multiple light-emitting diode stacks separated by tunnel junction(s). The diode stacks of the light source are independently addressable leading to a light source with high light output range.

Abstract: A LED light source includes a frame with side walls having reflective interior surfaces that define sides of an internal cavity. The frame may be placed above an LED array to contain the light of the array. One or more light transmitting layers may be placed above the frame to further or maintain containment of the light and/or to support an optical element above the frame. The optical element may direct the light of the LED array to provide a narrowed radiation pattern that may be advantageously employed for backlighting LCOS and other displays.

Abstract: An LED light source to produce a more Lambertian radiation pattern having a microLED die where the side walls of the die are reflective and sloped at a greater than 20 degrees angle and where the top surface of the LED die is roughened. Scattering particles may also be placed on the top emitting surface of the microLED. An optical element with roughened surfaces may be placed above the microLED die. The microLED die may also be placed in a cup structure with reflective side walls.

Abstract: An LED includes first/second doped layers with active region(s) therebetween emitting a first wavelength, and is arranged in a vertical die geometry with a reflective first electrical contact on a first LED surface. A wavelength converter absorbs the first wavelength and emits a second, longer wavelength. Some examples include a transparent second electrical contact on a second LED surface or angled LED sidewalls, and the wavelength converter is on the LED surface and the angled LED sidewalls. Some other examples include a second electrode on LED side surfaces extending beyond a second LED surface to form a cavity, with the wavelength converter on the second LED surface at least partly filling the cavity.

Abstract: An LED includes first/second doped layers with active region(s) therebetween emitting a first wavelength, and is arranged in a flip chip geometry with reflective layer(s) on a first LED surface. A wavelength converter facing a second LED surface absorbs the first wavelength and emits a second, longer wavelength. In some examples, the wavelength converter is on the LED surface and angled sidewalls. In some other examples, the wavelength converter is on the surface and angled sidewalls of a dielectric medium on the second LED surface. In still other examples, the LED can include on the first LED surface a mesa with the active region(s) and one of the doped layers, with angled LED and mesa sidewalls. The wavelength converter is on the LED surface and reflective layer(s) are on the LED sidewalls.

Abstract: An LED includes first/second doped layers with active region(s) therebetween emitting a first wavelength. A wavelength converter on a first LED surface absorbs the first wavelength and emits a second, longer wavelength. A second LED surface is against a substrate surface. A first electrical contact on the first LED surface extends along LED sidewalls, separated from the active region(s) and second doped layer by an insulating layer, connecting the first doped layer to a first contact pad. In some instances, contact pads are on the substrate surface; a second electrical contact extends onto LED sidewalls, connecting the second doped layer to a second contact pad. In some other instances contact pads are on laterally-extending portions of the second doped layer. The insulating layer separates the first contact pad from the second doped layer; a second contact pad is in direct electrical contact with the second doped layer.

Abstract: An LED includes a first composite layer on a first of its doped layers. Primary vias extend through the first composite layer, through the first doped layer and active region of the LED, and into a second doped layer thereof. A second composite layer (TCO, dielectric, multilayer reflector, and metal layers) is positioned on the second doped layer within the primary vias, on lateral surfaces of the primary vias, and on portions of the first composite layer. A dielectric spacer layer separates the first composite layer, the first doped layer, and the active region from the second composite layer. The TCO layer includes embedded electrical contact areas outside the primary vias, each being separated from the first doped layer by the first composite layer and the dielectric spacer layer. The second composite layer within the primary vias increases LED luminance (by reducing absorption, increasing reflectivity, and reducing darkening or dimming).

Abstract: This specification discloses light emitting devices electrical contacts that improve performance and clarity to operators of the light emitting devices. A small number of electrical contacts includes two or three contacts that may be independent driven from one another to obtain a desired luminance profile. The forward voltage Vf and internal quantum efficiency (IQE) may be easily known with the devices and methods described in this specification, allowing for ease-of-use combined with adaptability.

Abstract: This specification discloses a light emitting devices with electrical pads improving performance. The electrical pads are disposed under the dies to prevent hot spots from occurring, particularly under the peak luminance areas of shaped luminance dies. The electrical pads may have asymmetric n and p areas, with the larger of the areas being disposed under the peak luminance area while the gap between the n and p areas do not overlap the peak luminance area. The electrical pads of different dies are bridged by horizontal or diagonal connections between the dies.

Abstract: An apparatus and method is disclosed for determining the position of a user interface mouse using time of arrival measurements. A transmitter transmits a signal to an array of receivers that are spatially separated from one another. The time difference of arrival for is found for each receiver relative to a predetermined reference receiver. Using the time difference of arrival (TDOA) of each receiver, the location in 3-dimensional space of each receiver, and the speed of sound the position of the transmitter in 3-dimensional space relative to the reference receiver may be found.

Abstract: An apparatus and method is disclosed for determining the position of a user interface mouse using time of arrival measurements. A transmitter transmits a signal to an array of receivers that are spatially separated from one another. The time difference of arrival for is found for each receiver relative to a predetermined reference receiver. Using the time difference of arrival (TDOA) of each receiver, the location in 3-dimensional space of each receiver, and the speed of sound the position of the transmitter in 3-dimensional space relative to the reference receiver may be found.