Phase matched reset for digital micro-mirror device
First Claim
1. A method of resetting a movable element of a micro-mechanical device, said movable element being attracted toward a landing surface by means of an address voltage, and said movable element having a known resonant frequency, comprising the steps of:
- applying a bias voltage to said movable element and said landing surface;
switching said address voltage;
adding a reset voltage to said bias voltage, said reset voltage having pulses with a magnitude that is small relative to that of said bias voltage and with a frequency that is substantially the same as the resonant frequency of said movable element; and
removing said bias voltage until said moveable element is reset.
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Accused Products
Abstract
A method of resetting the mirrors (11, 21) of the mirror elements of a digital micro-mechanical device (DMD) (10, 20). A bias voltage is applied to the mirror elements and the surface upon which they land, but is removed after the address voltage has been switched. (FIG. 4). Immediately before the bias is removed, a reset voltage is added to the bias voltage. The reset voltage signal is comprised of a number of pulses at a frequency that matches the resonant frequency of the mirrors. The magnitude of the reset voltage results in a total applied voltage that permits vibrational energy to build but that is insufficient to cause the mirrors to become unstuck until the end of the reset signal. In other words, the magnitude of the reset voltage is small relative to that of the bias voltage.
45 Citations
18 Claims
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1. A method of resetting a movable element of a micro-mechanical device, said movable element being attracted toward a landing surface by means of an address voltage, and said movable element having a known resonant frequency, comprising the steps of:
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applying a bias voltage to said movable element and said landing surface; switching said address voltage; adding a reset voltage to said bias voltage, said reset voltage having pulses with a magnitude that is small relative to that of said bias voltage and with a frequency that is substantially the same as the resonant frequency of said movable element; and removing said bias voltage until said moveable element is reset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of resetting a mirror element of a digital micro-mirror device (DMD), said mirror element being tilted toward a landing surface by means of an address voltage under said mirror element and said mirror element having a known resonant frequency, comprising the steps of:
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applying a bias voltage to said mirror element and said landing surface; switching said address voltage; adding a reset voltage to said bias voltage, said reset voltage having pulses with a magnitude that is small relative to said bias voltage and with a frequency that is substantially the same as the resonant frequency of said mirror element; and removing said bias voltage until said moveable element is reset. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification