Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-03-28
1999-06-08
Nguyen, Chanh
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345117, 345212, G09G 322
Patent
active
059107910
ABSTRACT:
A method and a control circuit for controlling a field emission display to reduce emission to grid during turn on and turn off are provided. In an illustrative embodiment, the control circuit includes a threshold detector that receives an input signal proportional to an anode voltage (V.sub.Anode) for the display and produces a high or low output signal dependent on the level of V.sub.Anode. An output low corresponding to a high voltage at the display screen enables a gate element of a pass transistor that controls current flow to the grid. Alternately, an output high corresponding to a low voltage at the display screen enables a pull down transistor that controls discharge of the grid to ground. The control circuit can also include a fault detection circuit for detecting a sharp decrease in the anode voltage and discharging the grid. In an alternate embodiment, the control circuit shorts the emitter sites together during turn on and turn off and provides a high source impedance to restrict current flow to any one emitter site. The high source impedance can be permanent or switchable by a relay or switching circuit.
REFERENCES:
patent: 3500102 (1970-03-01), Crost et al.
patent: 3671798 (1972-06-01), Lees
patent: 4874891 (1989-10-01), Spindt
patent: 4908539 (1990-03-01), Meyer
patent: 5093654 (1992-03-01), Swift et al.
patent: 5210472 (1993-05-01), Casper et al.
patent: 5212426 (1993-05-01), Kane
patent: 5283500 (1994-02-01), Kochanski
patent: 5359256 (1994-10-01), Gray
patent: 5378962 (1995-01-01), Gray et al.
patent: 5402143 (1995-03-01), Ge et al.
patent: 5477110 (1995-12-01), Smith et al.
patent: 5557177 (1996-09-01), Engle
patent: 5581159 (1996-12-01), Lee et al.
patent: 5638085 (1997-06-01), Hush et al.
patent: 5638086 (1997-06-01), Hush et al.
patent: 5656892 (1997-08-01), Zimlich et al.
patent: 5721560 (1998-02-01), Cathey, Jr. et al.
Notes on Using the Spindt-type Field Emission Cathode, Capp Spindt, SRI International, Menlo Park, CA, Oct., 1976.
Cathey, David A. Jr., "Field Emission Displays", published in VLSI, Taiwan, May-Jun., 1995.
Cathey, Jr. David A.
Voshell Thomas W.
Zimlich David A.
Gratton Stephen A.
Micro)n Technology, Inc.
Nguyen Chanh
Suraci John
LandOfFree
Method and circuit for reducing emission to grid in field emissi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and circuit for reducing emission to grid in field emissi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and circuit for reducing emission to grid in field emissi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1685582