Importance

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Abstract

A color cathode ray tube employs a shadowmask having substantially vertical slots positioned between a single electron gun and substantially vertical color phosphor stripes on the faceplate of the tube. Piezoelectric bimorph actuators translate the shadowmask back and forth in a direction generally perpendicular to the direction of the slots and stripes in synchronization with field sequential color information to excite the phosphor stripes. In an alternative embodiment, the phosphor screen is moved relative to a fixed shadowmask. During the relative movement between the shadowmask and screen in a first direction, video information is provided from a memory in a first sequential manner, while for relative movement in a second direction, the video information is read out of memory in a reverse direction for executing a reverse raster starting from the bottom of the screen. The slots and phosphor stripes are skewed slightly with respect to one another to maintain proper color registration. In a further embodiment, instead of a shadowmask, a gating array is located between a broad source of electrons and the phosphor screen.

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First Claim