Capacitance gap calibration
First Claim
1. A method for calibrating a display device, comprising:
- controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage; and
controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence to determine a gap capacitance in said at least one fabry-perot interferometer;
wherein said gap capacitance represents a relative position of said top plate with respect to said bottom plate.
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Accused Products
Abstract
A method for calibrating a display device comprises controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches. The at least one fabry-perot interferometer pixel has a top and a bottom plate defining a gap therebetween wherein the at least one fabry-perot interferometer pixel produces a selected output color in response to the applied voltage. The method further includes controlling a test voltage to the at least one fabry-perot interferometer pixel through the plurality of switches during a calibration sequence to determine a gap capacitance in the at least one fabry-perot interferometer. The gap capacitance represents the relative position of the top plate with respect to the bottom plate.
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Citations
25 Claims
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1. A method for calibrating a display device, comprising:
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controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage; and
controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence to determine a gap capacitance in said at least one fabry-perot interferometer;
wherein said gap capacitance represents a relative position of said top plate with respect to said bottom plate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for calibrating a display device using a switched capacitor technique, comprising:
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controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage;
controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence by cycling said switches on and off at a predetermined frequency;
measuring a current in said at least one fabry-perot interferometer pixel through said plurality of switches; and
determining a gap capacitance in said at least one fabry-perot interferometer using said test voltage, said predetermined frequency, and said current. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A display device, comprising:
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a means for controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage;
a means for controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence by cycling said switches on and off at a predetermined frequency;
a means for measuring the current in said at least one fabry-perot interferometer pixel through said plurality of switches; and
a means for determining a gap capacitance in said at least one fabry-perot interferometer using said test voltage, said predetermined frequency, and said current. - View Dependent Claims (14)
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15. A display device, comprising:
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at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
a plurality of switches configured to control a predetermined applied voltage to said at least one fabry-perot interferometer pixel;
wherein said at least one fabry-perot interferometer pixel is configured to produce a selected output color in response to said predetermined applied voltage; and
a test voltage applied through said plurality of switches to said at least one fabry-perot interferometer pixel during a calibration sequence to determine a capacitance in said gap of said at least one fabry-perot interferometer pixel. - View Dependent Claims (16, 17, 18)
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19. An image processing unit having instructions thereon for calibrating a display device, said instructions being configured to instruct said processing unit to perform the steps of:
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controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage;
controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence to determine a gap capacitance in said at least one fabry-perot interferometer;
wherein said gap capacitance represents a relative position of said top plate with respect to said bottom plate. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for calibrating a display device, comprising:
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controlling an applied voltage to at least one fabry-perot interferometer pixel through a plurality of switches, said at least one fabry-perot interferometer pixel having a top and a bottom plate defining a gap therebetween;
wherein said at least one fabry-perot interferometer pixel produces a selected output color in response to said applied voltage;
applying a DC bias voltage to said at least one fabry-perot interferometer pixel to maintain a predetermined relative position between said top and said bottom plates;
controlling a test voltage to said at least one fabry-perot interferometer pixel through said plurality of switches during a calibration sequence by cycling said switches on and off at a predetermined frequency;
measuring a current in said at least one fabry-perot interferometer pixel through said plurality of switches;
determining a gap capacitance in said at least one fabry-perot interferometer using said test voltage, said predetermined frequency, and said current;
comparing said test voltage and said gap capacitance to a previous gap capacitance to determine a change in a relationship between said test voltage and said gap capacitance; and
adjusting said applied voltage to said at least one fabry-perot interferometer pixel through a plurality of switches based on a change in said relationship between said test voltage and gap capacitance.
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Specification