Method and system for writing data to MEMS display elements
First Claim
1. A display device comprising a set of MEMS display elements configured as an array of rows and columns of MEMS elements, wherein the MEMS elements are characterized by a preferred set of drive potential differences comprising preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, wherein the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δ
- V and wherein drive potential differences are applied to each MEMS element as a difference between a column voltage and a row voltage, said method comprising;
generating a set of four different voltage levels;
writing display data to the array by applying voltages to each column of the array and each row of the array so as to apply first and second actuation potential differences, first and second hold potential differences, and first and second release potential differences, wherein said voltages are selected only from said set of four different voltage levels, and wherein first and second hold potentials are of opposite polarity.
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Abstract
Another embodiment has a method of driving a display device including an array of MEMS elements is disclosed. The MEMS elements are characterized by a preferred set of drive potential differences including preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, where the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δV. Another embodiment has a reduced set of supply voltages are used, while maintaining the charge balancing effects of applying potential differences of opposite polarity without visible artifacts.
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Citations
37 Claims
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1. A display device comprising a set of MEMS display elements configured as an array of rows and columns of MEMS elements, wherein the MEMS elements are characterized by a preferred set of drive potential differences comprising preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, wherein the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δ
- V and wherein drive potential differences are applied to each MEMS element as a difference between a column voltage and a row voltage, said method comprising;
generating a set of four different voltage levels;
writing display data to the array by applying voltages to each column of the array and each row of the array so as to apply first and second actuation potential differences, first and second hold potential differences, and first and second release potential differences, wherein said voltages are selected only from said set of four different voltage levels, and wherein first and second hold potentials are of opposite polarity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- V and wherein drive potential differences are applied to each MEMS element as a difference between a column voltage and a row voltage, said method comprising;
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12. A microelectromechanical system (MEMS) display device comprising:
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an array of rows and columns of MEMS elements, wherein the MEMS elements are characterized by a preferred set of drive potential differences comprising preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, wherein the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δ
V; and
an array driver configured to write display data to the array by applying voltages to each column of the array and each row of the array so as to apply first and second actuation potential differences, first and second hold potential differences, and first and second release potential differences, wherein the voltages are selected from a set of only four different voltage levels, and wherein first and second hold potentials are of opposite polarity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of driving a display device comprising a set of MEMS display elements configured as an array of rows and columns of MEMS elements, wherein said MEMS elements are characterized by a preferred set of drive potential differences comprising preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, wherein the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δ
- V and wherein drive potential differences are applied to each MEMS element as a difference between a column voltage and a row voltage, the method comprising;
generating a set of four different voltage levels;
writing display data to the array by applying voltages to each column of the array and each row of the array so as to apply first and second actuation potential differences, first and second hold potential differences, and first and second release potential differences, wherein the voltages are selected only from the set of four different voltage levels, and wherein at least one of first and second actuation potentials, first and second hold potentials, and first and second release potentials are of opposite polarity and are symmetric about the offset voltage δ
V. - View Dependent Claims (29, 30, 31, 32, 33, 34)
- V and wherein drive potential differences are applied to each MEMS element as a difference between a column voltage and a row voltage, the method comprising;
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35. A microelectromechanical system (MEMS) display device comprising:
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means for displaying rows and columns of image data, wherein said means are characterized by a preferred set of drive potential differences comprising preferred positive and preferred negative actuation potential differences, preferred positive and preferred negative hold potential differences, and a preferred release potential difference, wherein the preferred set of drive potential differences is symmetric about a voltage differing from 0V by an offset δ
V; and
means for writing image data to the means for displaying by applying voltages to each column of the array and each row of the array so as to apply first and second actuation potential differences, first and second hold potential differences, and first and second release potential differences, wherein the voltages are selected from a set of only four different voltage levels, and wherein first and second hold potentials are of opposite polarity. - View Dependent Claims (36, 37)
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Specification