Abstract: A matrix multiplexed field effect display has switch devices at matrix crosspoints to provide a turn-on threshold for the field effect material. The switch devices are thin film metal-insulator-metal (MIM) switches. The display is operated at low current so that the MIM switches, which may be deposited on glass, do not degrade rapidly in use.

Abstract: In a thermal print bar for use in facsimile systems, an array of individually selectable electrical current paths are defined in a strip of resistive materials having a high negative temperature coefficient of resistance. In operation, the resistance of a selected current path is markedly reduced in contrast with the resistance of unselected current paths parallel to the selected path so that the parallel current paths do not experience joule heating. Electrical power saving and visual contrast result.

Abstract: A thermal printing bar, as for a facsimile printer, has a pattern of associated conductors on each side thereof to produce two rows of hot spots in the printing bar. The hot spots in one row are offset relative to the other row. By suitably sizing the hot spots, the spots in one row will at least completely fill the gaps between the spots in the other row, or can even overlap. By this means, the one row is first printed on the paper; the paper moved by the distance between the centers of the rows and then the other row printed. This provides contiguous or overlapping spots on the paper, giving improved contrast.