Opposed scanning electron beams light source for projection LCD

Details Opposed scanning electron beams light source for projection LCD Opposed scanning electron beams light source for projection LCD

1993-06-22

1995-01-10

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 40, 348776, G02F 11335, H04N 574

Patent

active

053812522

ABSTRACT:
A projection liquid crystal display (LCD) system includes a liquid crystal display 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 display panel's aft surface is transmitted through the panel as each horizontal linear array of electrodes is turned "ON", with the horizontal linear arrays sequentially turned on for vertically scanning the display panel in a stepwise manner. LCD backlighting is provided by a cathode ray tube (CRT) having a phosphorbearing faceplate which emits light when an electron beam is incident thereon. The CRT includes two electron beams which are directed onto the faceplate's inner phosphor layer and are deflected in opposed directions along a common horizontal scan line, where each horizontal scan line on the CRT's faceplate is traced in sequence by the two beams. Each horizontal scan of the CRT's faceplate by the two electron beams is synchronized with the turning on of the vertically spaced, horizontal arrays of the first scanning electrodes to provide a single line light source for illuminating only that portion of the display panel containing video information for improved video image contrast and more efficient LCD panel backlighting. The total electron beam energy at each faceplate pixel when integrated over an entire horizontal scan line period is essentially constant when both beams have equal Gaussian beam density distributions to provide uniform illumination over the entire horizontal scan line.

REFERENCES:
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4196370 (1980-04-01), Hughes
patent: 4544237 (1985-10-01), Gagnon
patent: 4611889 (1986-09-01), Buzak
patent: 4758818 (1988-07-01), Vatne
patent: 4842374 (1989-06-01), Ledebuhr
patent: 4933604 (1990-06-01), Noda et al.
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: 5140449 (1992-08-01), Sluzky et al.
patent: 5142388 (1992-08-01), Watanabe et al.
patent: 5144471 (1992-09-01), Takanashi et al.
patent: 5146354 (1992-08-01), Plesenger et al.
patent: 5146355 (1992-09-01), Prince et al.
patent: 5162786 (1992-11-01), Fukuda
patent: 5162930 (1992-11-01), Sluzky et al.
patent: 5175637 (1992-12-01), Jones et al.
patent: 5214521 (1993-05-01), Kwon et al.
patent: 5268775 (1993-12-01), Zeidler
patent: 5303054 (1994-04-01), Chen

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