Abstract: Light emitting devices comprise excitation sources arranged to excite quantum dots which fluoresce to emit light. In an embodiment, a device is manufactured by a process which involves applying an acoustic field is applied to a fluid containing quantum dots, to cause the quantum dots to accumulate at locations which are adjacent to excitation sources, and then initiating a phase transition of the fluid to trap the quantum dots in the locations adjacent to the excitation sources. The quantum dots are illuminated during the process and the resulting fluorescence is optically monitored to provide indicators of quantum dot distribution in the fluid. These indicators are used as feedback for controlling aspects of the process, such as initiating the phase transition.

Abstract: Driving circuits are provided that compensate for devices having characteristics that change with age. A correction circuit has a reference device having an output that changes with age in a known manner over a time span similar to the expected lifetime of the driven device. The output of reference device provides an indication of the current age of driven device.

Abstract: Driving circuits are provided that compensate for devices having characteristics that change with age. A correction circuit has a reference device having an output that changes with age in a known manner over a time span similar to the expected lifetime of the driven device. The output of reference device provides an indication of the current age of driven device.

Abstract: Light emitting devices comprise excitation sources arranged to excite quantum dots which fluoresce to emit light. In an embodiment, a device is manufactured by a process which involves applying an acoustic field is applied to a fluid containing quantum dots, to cause the quantum dots to accumulate at locations which are adjacent to excitation sources, and then initiating a phase transition of the fluid to trap the quantum dots in the locations adjacent to the excitation sources. The quantum dots are illuminated during the process and the resulting fluorescence is optically monitored to provide indicators of quantum dot distribution in the fluid. These indicators are used as feedback for controlling aspects of the process, such as initiating the phase transition.

Abstract: A display comprises a block of optically transparent materials. Patterns are etched within the block. The patterns may be selectively illuminated by light directed into sides of the block. Barriers divide the block or layers within the block into segments. Patterns in different segments and/or in different layers of the block may be independently illuminated. In some embodiments the block is made up of a number of sheets of optically transmissive material. The block may permit viewing of display elements or other objects or things located behind the block. Patterns may be configured to scatter preferentially light of specific polarizations. Displays may be applied in a wide variety of applications including in vehicles, as displays on electronic devices and the like.

Abstract: Driving circuits are provided that compensate for devices having characteristics that change with age. A correction circuit has a reference device having an output that changes with age in a known manner over a time span similar to the expected lifetime of the driven device. The output of reference device provides an indication of the current age of driven device.

Abstract: A system for controlling one or more devices through a power line comprises one or more control signal generators for generating control signal(s). Each control signal has a frequency within a predetermined frequency band and is injected onto the power line. A filter coupled between the power line and each device. Each filter is configured to pass signals within the corresponding frequency band to the device and block substantially all other signals, such that the device receives electrical power from the high frequency control signal.