Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2007-07-24
2007-07-24
Awad, Amr A. (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Reexamination Certificate
active
10361382
ABSTRACT:
A field sequential pulse width modulated display system (10) comprises a digital micromirror device (DMD) (24) having a plurality of micromirrors that each selectively pivot to reflect light onto a screen (28) to illuminate a corresponding pixel. A driver circuit (30) controls the DMD (24) responsive to sequences of pulse width segments formed by a processor (31). The processor (31) forms the pulse width segment sequences to alter the pixel brightness for a given one of a set of primary colors within a range of brightness values between adjacent pixel brightness boundaries, with each segment for each color interleaved with the segments for the other colors. The processor (31) alters the pixel brightness for a given color by altering the state of at least one selected pulse in only a single pulse width segment unless all of the pulses in that segment have the same state (all actuated or de-actuated), whereupon the state of one or more selected pulses in another pulse width segment are altered as the brightness of the pixels change. Any redistribution of light resulting from a change in pixel brightness is limited to the interval corresponding to a single pulse width segment, thereby reducing the likelihood of a visual disturbance perceptible to a viewer.
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Awad Amr A.
Fried Harvey D.
Holton Steven
Laks Joseph J.
Thomson Licensing
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