Television – Video display – Projection device
Patent
1993-05-17
1994-04-12
Powell, Mark R.
Television
Video display
Projection device
359 48, 313441, 348776, H04N 574
Patent
active
053030540
ABSTRACT:
A projection liquid crystal display (LCD) system includes an 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 stepwise manner. Liquid crystal display backlighting is provided by a cathode ray tube (CRT) having a phosphor-bearing faceplate which emits light when energetic electrons in the form of a horizontal, linear, elongated beam are incident thereon. An electron beam source in the CRT including, in combination, an elongated, linear wire-like cathode and a focusing concave charged electrode disposed about the cathode and having an electron-passing slot extending substantially the entire length thereof directs an elongated, linear, horizontally aligned electron beam across the width of the CRT's faceplate. A pair of spaced, charged plates disposed adjacent the electron-passing slot in the focusing electrode deflect the electron beam vertically over the faceplate in a stepwise manner and synchronously with actuation of the scanning electrodes to illuminate only that portion of the display panel containing video information for improved video image contrast and more efficient backlighting.
REFERENCES:
patent: 4931652 (1990-05-01), Nakamura
patent: 4951150 (1990-08-01), Browning
patent: 5089883 (1992-02-01), Welker et al.
patent: 5103328 (1992-04-01), Numao
patent: 5128782 (1992-07-01), Wood
patent: 5135300 (1992-08-01), Toide et al.
patent: 5175637 (1992-12-01), Jones et al.
Chunghwa Picture Tubes Ltd.
Powell Mark R.
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