Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2003-07-07
2009-02-24
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S063000, C345S077000, C345S087000, C345S094000, C345S204000
Reexamination Certificate
active
07495642
ABSTRACT:
A field sequential pulse width modulated display system comprises a digital micromirror device (DMD) having a plurality of micromirrors that each selectively pivot to reflect light onto a screen to illuminate a corresponding pixel. A driver circuit controls the DMD responsive to sequences of pulse width segments formed by a processor. The processor actuates at least one pulse in a first pulse width segment for a given color to increase pixel brightness with a range lying between first and second pixel brightness values. To further increase pixel brightness, the processor actuates at least one pulse within additional pulse width segments associated with the same given color to increase pixel brightness above the second brightness boundary. The pulses within the additional segments are actuated unequally so that the additional pulse width segments closest in time to the first segment (i.e., the segment first in brightness) have a greater total duration of actuated pulses for a given pixel brightness compared to the additional pulse width segments farther in time from the first segment. Actuating the pulses in this manner serves to: (a) limit the time dispersal of darker objects within a picture, (b) minimize the light redistribution between time segments for incremental brightness changes, and (c) taper up and down light intensity for the sequence of pulse width segments for a given picture, all to minimize motion artifacts.
REFERENCES:
patent: 5448314 (1995-09-01), Heimbuch et al.
patent: 5777589 (1998-07-01), Gale et al.
patent: 5909204 (1999-06-01), Gale et al.
patent: 6377234 (2002-04-01), Nogawa
patent: 6590549 (2003-07-01), Marshall
patent: 2003/0122494 (2003-07-01), Ide
patent: 2003/0193514 (2003-10-01), Huang
patent: 0896317 (1999-02-01), None
patent: 7-264515 (1995-10-01), None
Copy of Search Report dated Sep. 28, 2003.
Hoppenbrouwers, JJL et al., “100-Hz Video Upconversion in Plasma Displays”, 2002 SID International Symposium Digest of Technical Papers, Boston, MA, May 21-23, 2002, vol. 33/2, May 2002, pp. 922-925.
Fried Harvey D.
Kovalick Vince E
Laks Joseph J.
Shalwala Bipin
Thomson Licensing
LandOfFree
Sequential multi-segment pulse width modulated display system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sequential multi-segment pulse width modulated display system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sequential multi-segment pulse width modulated display system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4122660