Importance

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Abstract

A video display system includes a passive display panel such as a liquid crystal display (LCD) panel including a first plurality of horizontally aligned transparent conductive scanning electrodes and a second plurality of vertically aligned transparent conductive signal electrodes disposed on opposed surfaces of the panel. Light directed onto the aft surface of the display panel is transmitted through the panel as each horizontal linear array of first scanning electrodes is turned 'ON' with the horizontal linear arrays sequentially turned on for vertically scanning the display panel in a step wise manner. Time varying video image information is provided to the vertically aligned electrodes. Liquid crystal display backlighting is provided in the form of a thin, elongated light beam of uniform intensity directed onto the display panel's aft surface. The backlighting beam is vertically displaced, such as from top to bottom, in a stepwise manner over the display panel synchronously with the turning 'ON' of the horizontal scanning electrodes such that the beam illuminates only the horizontal linear array of the scanning electrodes which is turned 'ON' i.e., only that portion of the display panel containing visible video information, for improved video image contrast and more efficient backlighting of the display panel. The scanning back light beam is provided by a partitioned or sectioned light panel, such as a plasma discharge panel (PDP), where the partitions are each aligned with a respective horizontal array of scanning electrodes and sequentially turned 'ON' synchronously with actuation of the scanning electrode arrays.

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First Claim