Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2008-07-22
2008-07-22
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S074100, C345S075200, C345S063000, C345S072000, C345S077000, C345S690000, C345S204000, C315S169100, C315S169300
Reexamination Certificate
active
07403175
ABSTRACT:
Methods for compensating for brightness variations in a field emission device. In one embodiment, a method and system are described for measuring the relative brightness of rows of a field emission display (FED) device, storing information representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjusting row voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows near the spacer walls. In another embodiment, a periodic signal, e.g., a high frequency noise signal, is added to the row on-time pulse in order to camouflage brightness variations in the rows near the spacer walls. In another embodiment, the area under the row on-time pulse is adjusted to provide row-by-row brightness compensation based on correction values stored in a memory resident correction table. In another embodiment, the brightness of each row is measured and compiled into a data profile for the FED. The data profile is used to control cathode burn-in processes so that brightness variations are corrected by physically altering the characteristics of the emitters of the rows.
REFERENCES:
patent: 5262698 (1993-11-01), Dunham
patent: 5541473 (1996-07-01), Duboc, Jr. et al.
patent: 5559389 (1996-09-01), Spindt et al.
patent: 5564959 (1996-10-01), Spindt et al.
patent: 5578899 (1996-11-01), Haven et al.
patent: 5607335 (1997-03-01), Spindt et al.
patent: 5608283 (1997-03-01), Twichell et al.
patent: 5708451 (1998-01-01), Baldi
patent: 6037918 (2000-03-01), Hansen et al.
patent: 6051937 (2000-04-01), Dunphy et al.
patent: 6097356 (2000-08-01), Fan
patent: 6104139 (2000-08-01), Elloway et al.
patent: 6133893 (2000-10-01), Maslennikov et al.
patent: 6140985 (2000-10-01), Kanai et al.
patent: 6147664 (2000-11-01), Hansen
patent: 6153986 (2000-11-01), Dunphy et al.
patent: 6166490 (2000-12-01), Hansen
patent: 6169529 (2001-01-01), Hansen et al.
patent: 6329759 (2001-12-01), Tanaka et al.
patent: 6392355 (2002-05-01), Palmer et al.
patent: 6462484 (2002-10-01), Dunphy et al.
patent: 6465966 (2002-10-01), Konuma
patent: 6822628 (2004-11-01), Dunphy et al.
patent: 7158107 (2007-01-01), Kawabe et al.
Cressi Lee
Cummings William
Dunphy James C.
Hansen Ronald L.
Liu Jun (Gordon)
Canon Kabushiki Kaisha
Hjerpe Richard
Ladas & Parry LLP
Nguyen Jennifer T
LandOfFree
Methods and systems for compensating row-to-row brightness... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and systems for compensating row-to-row brightness..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and systems for compensating row-to-row brightness... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2767898