Digitally driving pixels from pulse width modulated waveforms

Details Digitally driving pixels from pulse width modulated waveforms Digitally driving pixels from pulse width modulated waveforms

2006-05-02

2006-05-02

Tran, Henry N. (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Physically integral with display elements

C345S087000, C345S208000, C345S690000

Reexamination Certificate

active

07038671

ABSTRACT:
Pulse-width modulation may be utilized to drive one or more display elements of a display (e.g. pixels of a liquid crystal display system) comprising a controller that supplies digital information including global and local digital information to a respective signal generator associated with each display element operably coupled to the controller for receiving the digital information. In one embodiment, a spatial light modulator includes a respective local drive circuit associated with each pixel of a pixel array, and a global drive circuit operably coupled to the pixel array for digitally driving the pixel electrodes. Each local drive circuit may include a pixel logic, a digital storage, and pulse-width modulation circuitry. The global drive circuit may include a control logic, and a memory storing global digital information indicative of a common reference (e.g., a count value) and local digital information (e.g., a pixel value) indicative of an optical output from each pixel. Based on the global and local digital information, the pixel logic and control logic may cooperatively determine a transition separating a first pulse interval and a second pulse interval in a modulated signal generated for each pixel.

REFERENCES:
patent: 5977942 (1999-11-01), Walker et al.
patent: 6072452 (2000-06-01), Worley et al.
patent: 6137462 (2000-10-01), Kim
patent: 6373478 (2002-04-01), Steffensmeier
patent: 6590549 (2003-07-01), Marshall
patent: 2002/0063728 (2002-05-01), Stevens

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