Control of micromirrors with intermediate states

Details Control of micromirrors with intermediate states Control of micromirrors with intermediate states

2007-12-04

2007-12-04

Mack, Ricky (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S291000, C359S292000

Reexamination Certificate

active

11136041

ABSTRACT:
A micromirror device with at least one intermediate state is disclosed in this invention with the reflecting mirror placed at an angular position between a fully on angle and fully off angle. The micromirror device includes a reflecting element supported on a hinge for oscillating and positioning at least three angular positions. The micromirror device further has a control circuit for receiving a series of control words of different number of bits as a time modulation signal to control the reflecting element for controlling a gray scale of display wherein the control circuit further receiving an oscillation signal for superimposing on the time modulation signal for oscillating the reflecting element for further controlling the gray scale of display. The series of control words further includes a sequence of control words of a least number of bits to a maximum number of bits of a least number of bits to a maximum number of bits with a time gap between each of the control words. The oscillating signal may be inserted optionally into a gap between the control words, into every control word, into a control word of the MSB, or into a control word of the LSB, In a preferred embodiment, the oscillating signal is applied to dispose the reflecting element at an intermediate state with a zero degree relative to an incident light.

REFERENCES:
patent: 7023607 (2006-04-01), Huibers
patent: 2004/0008402 (2004-01-01), Patel et al.

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