A display system, including an optical transmitter configured to optically transmit digital image information associated with an image to be displayed. The system also includes an active display including a decoder electrically coupled with a plurality of display elements that are configured to produce visible light in response to electrical stimulation. The decoder is configured to receive the digital image information and in response produce a control signal for each of the display elements, the control signals being usable to individually control visible light produced by the display elements so as to cause display of the image.

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> Method and apparatus for assessing nozzle health

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