Method and apparatus for driving two-dimensional modulator...

Details Method and apparatus for driving two-dimensional modulator... Method and apparatus for driving two-dimensional modulator...

2007-01-09

2007-01-09

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S148000, C310S309000

Reexamination Certificate

active

10809978

ABSTRACT:
In one embodiment, a micro electromechanical system (MEMS) driver circuit receives a pulse-width modulated (PWM) signal and uses it to control a voltage at a MEMS cell. The driver circuit further includes a current source, a capacitor, and a reset circuit that can discharge the capacitor. The voltage at the MEMS cell can be controlled in proportion to the pulse width of the PWM signal. In another embodiment disclosed, a MEMS driver circuit receives a first PWM signal and a second PWM signal. Each PWM signal is coupled to a current source. One current source can provide a course current control and the other current source can provide fine current control. The driver circuit can further include a capacitor and a reset circuit for discharging the capacitor. The voltage at the MEMS cell can be controlled in proportion to a summation of the first and second current sources. According to another aspect of the embodiments, a method of controlling a voltage at a MEMS cell is disclosed. The method includes the steps of receiving a PWM signal, controlling a current source with the PWM signal, and adjusting the voltage at the MEMS cell in proportion to a pulse width of the PWM signal.

REFERENCES:
patent: RE34295 (1993-06-01), Shibuya et al.
patent: 6543286 (2003-04-01), Garverick et al.
patent: 6674383 (2004-01-01), Horsley et al.
patent: 6705165 (2004-03-01), Garverick et al.
patent: 6750589 (2004-06-01), Cabuz

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