Micromirror resonance supression using configurable filter
The configuring of a micromirror to suppress a resonance of the micromirror. As part of the configuring process, the micromirror is subjected to multiple actuation frequencies, and the micromirror response is measured in response to at least some of these actuation frequencies. A resonant frequency of the micromirror is then determined using at least some of the measured mechanical responses. Then, depending on this determined resonant frequency of the micromirror, notch filter parameters are selected. There is more than one possibility for notch filter parameters, where the selected possibility depends on the determined resonant frequency. The notch filter is then configured with the selected notch filter parameters.
1 . A method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror, the method comprising:
subjecting the micromirror to a first plurality of actuation frequencies, wherein the first plurality of actuation frequencies comprises at least a chirp;
measuring a mechanical response of the micromirror to at least some of the first plurality of actuation frequencies;
determining a second plurality of actuation frequencies, wherein the second plurality of actuation frequencies comprises a smaller frequency range determined based on the mechanical response of the micromirror to the chirp;
measuring a mechanical response of the micromirror to the second plurality of actuation frequencies;
determining a resonant frequency of the micromirror using the mechanical response of the micromirror to the second plurality of actuation frequencies determined based on the mechanical response of the micromirror to the chirp;
selecting notch filter parameters of a notch filter that is structured to filter actuation signals of the micromirror, the selection depending on the determined resonant frequency; and
configuring the notch filter with the selected notch filter parameters.
2 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the notch filter configured to have a suppression frequency range greater than 1500 Hz, but less than 3000 Hz, when configured with the selected notch filter parameters.
3 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , a plurality of sets of notch filter parameters having been predetermined, the selecting of the notch filter parameters comprising selecting one set of the plurality of sets of notch filter parameters.
4 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 3 , each of the plurality of sets of notch filter parameters causing the notch filter to have a suppression frequency range greater than 1500 Hz, but less than 3000 Hz.
5 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 3 , each of the plurality of sets of notch filter parameters causing the notch filter to have a suppression frequency range that overlaps with a neighboring suppression frequency range.
6 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 5 , each of the plurality of sets of notch filter parameters causing the notch filter to have a suppression frequency range that overlaps with a neighboring suppression frequency range by at least 500 Hz.
7 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 5 , each of the plurality of sets of notch filter parameters causing the notch filter to have a suppression frequency range that overlaps with a neighboring suppression frequency range by at least 1500 Hz.
8 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the selecting of the notch filter parameters comprising calculating the notch filter parameters after determining the resonant frequency of the micromirror.
9 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the method performed after the micromirror has been manufactured, but before runtime.
10 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the method being performed during power up of the micromirror by a user of the micromirror.
11 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the method being performed a plurality of times, the selected notch filter parameters being different for at least one of the plurality of times.
12 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 11 , at least one of the plurality of times occurring at or after the micromirror has been manufactured but before runtime, at least one of the plurality of times performed in response to user activity with respect to the micromirror.
13 . The method for configuring actuation of a micromirror to suppress mechanical resonance of the micromirror in accordance with claim 1 , the method being performed during operation of the micromirror by a user of the micromirror.
14 . The method in accordance with claim 1 , the micromirror being a slow scan mirror of a laser bean scanning display having a fast scan mirror and the slow scan mirror.
15 . An optical system comprising:
a micromirror;
an actuation component configured to actuate the micromirror;
a notch filter configured to suppress frequencies in an actuation signal generated by the actuation component within a target suppression frequency range that depends on configuration of the notch filter; and
a notch filter configuration component that is configured to configure actuation of a micromirror to suppress mechanical resonance of the micromirror, by being configured to perform the following:
subjecting the micromirror to a first plurality of actuation frequencies, wherein the first plurality of actuation frequencies comprises at least a chirp;
measuring a mechanical response of the micromirror to the first plurality of actuation frequencies;
determining a second plurality of actuation frequencies, wherein the second plurality of actuation frequencies comprises a smaller frequency range determined based on the mechanical response of the micromirror to the chirp;
measuring a mechanical response of the micromirror to the second plurality of actuation frequencies;
determining a resonant frequency of the micromirror using the mechanical response of the micromirror to the second plurality of actuation frequencies determined based on the mechanical response of the micromirror to the chirp;
selecting notch filter parameters of a notch filter configured to filter actuation signals of the micromirror, the selection depending on the determined resonant frequency of the micromirror; and
configuring the notch filter with the selected notch filter parameters.
16 . The optical system in accordance with claim 15 , the notch filter configured to have a suppression frequency range greater than 1500 Hz, but less than 3000 Hz, when configured with the selected notch filter parameters.
17 . The optical system in accordance with claim 15 , a plurality of sets of notch filter parameters having been predetermined, the selecting of the notch filter parameters comprising selecting one set of the plurality of sets of notch filter parameters.
18 . The optical system in accordance with claim 15 , the micromirror being a slow scan mirror of a laser beam scanning display, the optical system also comprising a fast scan mirror.
19 . The optical system in accordance with claim 15 , the notch filter configuration component structured to perform the configuration at least some of the times that the optical system is powered up.
20 . The optical system in accordance with claim 15 , the notch filter configuration component structured to perform the configuration a plurality of times and not limited to select the same notch filter parameters each of the plurality of times.