| 摘要 |
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. Video image information is provided to the vertically aligned electrodes. Liquid crystal display backlighting is provided by an elongated, linear lamp disposed within a first concave reflector for directing the beam onto a second reflector which reflects the beam onto the display panel's aft surface in the form of a thin, elongated line extending the width of the display panel. The second reflector displaces the beam over the display panel in the disclosed embodiment from top to bottom synchronously with scanning of the horizontally aligned scanning electrodes in the panel 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 video information, for improved video image contrast and more efficient backlighting of the display panel.
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