Method and system for writing data to electromechanical display elements
First Claim
Patent Images
1. A method of writing display data to an array of interferometric display elements, said method comprising:
- writing display data to said interferometric display elements to display an image;
subsequent to said writing, applying a bias potential of a first polarity to a first column of the array of interferometric display elements during a first hold period;
applying a bias potential of a second polarity to a second column of the array of interferometric display elements during the first hold period, said second polarity being opposite said first polarity;
subsequent to said first hold period, applying a bias potential of said second polarity to said first column during a second hold period; and
applying a bias potential of said first polarity to said second column during the second hold period,wherein said first column is adjacent said second column, wherein actuated elements in the first and second columns remain actuated during the first and second hold periods, and wherein unactuated elements in the first and second columns remain unactuated during the first and second hold periods, andwherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC, wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials.
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Abstract
Methods and devices for applying bias potentials of opposite polarities to columns of electromechanical display elements are described herein. The bias potentials may be applied such that a column and an adjacent column receive bias potentials of opposite polarity. The bias potentials may be applied such that a polarity of bias voltages received by columns of a first set of the display elements is opposite a polarity of bias voltages received by columns of a second set of the display elements.
88 Citations
30 Claims
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1. A method of writing display data to an array of interferometric display elements, said method comprising:
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writing display data to said interferometric display elements to display an image; subsequent to said writing, applying a bias potential of a first polarity to a first column of the array of interferometric display elements during a first hold period; applying a bias potential of a second polarity to a second column of the array of interferometric display elements during the first hold period, said second polarity being opposite said first polarity; subsequent to said first hold period, applying a bias potential of said second polarity to said first column during a second hold period; and applying a bias potential of said first polarity to said second column during the second hold period, wherein said first column is adjacent said second column, wherein actuated elements in the first and second columns remain actuated during the first and second hold periods, and wherein unactuated elements in the first and second columns remain unactuated during the first and second hold periods, and wherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC, wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display device comprising:
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an array of interferometric display elements; and an array controller configured to supply signals to columns of the array so as to display an image, to apply a bias potential of a first polarity to a first column of the array of interferometric display elements during a first hold period, to apply a bias potential of a second polarity to a second column of the array of interferometric display elements during the first hold period, to apply a bias potential of said second polarity to said first column during a second hold period, and to apply a bias potential of said first polarity to said second column during the second hold period, wherein said second polarity is opposite said first polarity, wherein said first column is adjacent said second column, wherein actuated elements in the first and second columns remain actuated during the first and second hold periods, and wherein unactuated elements in the first and second columns remain unactuated during the first and second hold periods, and wherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC, wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A display apparatus, comprising:
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an array of means for displaying an image; means for writing display data to said displaying means; means for applying a bias potential of a first polarity to a first column of the array during a first hold period, said first hold period being subsequent to said writing; means for applying a bias potential of a second polarity to a second column of the array during the first hold period, said second polarity being opposite said first polarity; means for applying a bias potential of said second polarity to said first column during a second hold period, said second hold period being subsequent to said first hold period; and means for applying a bias potential of said first polarity to said second column during the second hold period, wherein said first column is adjacent said second column, wherein actuated displaying means in the first and second columns remain actuated during the first and second hold periods, and wherein unactuated displaying means in the first and second columns remain unactuated during the first and second hold periods, and wherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (16, 17)
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18. A method of writing frames of display data to an array of electromechanical display elements, said method comprising:
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writing display data to said electromechanical display elements to display an image; applying a first series of bias voltages of alternating polarity to a first set of columns of the array of electromechanical display elements; and applying a second series of bias voltages of alternating polarity to a second set of columns of the array of electromechanical display elements; wherein a polarity of the bias voltages received by the columns of the first set is opposite a polarity of the bias voltages received by the columns of the second set during said applying of the first series and said applying of the second series, wherein actuated elements in the first and second sets of columns remain actuated while the first and second series are applied, and wherein unactuated elements in the first and second sets of columns remain unactuated while the first and second series are applied, and wherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC,wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A display device, comprising:
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an array of electromechanical display elements; and an array controller configured to supply signals to columns of the array so as to display an image, to apply a first series of bias voltages of alternating polarity to a first set of columns of the array, and to apply a second series of bias voltages of alternating polarity to a second set of columns of the array, wherein a polarity of the bias voltages received by the columns of the first set is opposite a polarity of the bias voltages received by the columns of the second set during said applying of the first series and said applying of the second series, wherein actuated elements in the first and second sets of columns remain actuated while the first and second series are applied, and wherein unactuated elements in the first and second sets of columns remain unactuated while the first and second series are applied, and wherein a transition time between bias voltages applied to the same column is less than or equal to τ
iMoD+τ
RC, wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (25, 26, 27)
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28. A display apparatus, comprising:
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an array of means for displaying an image, the array comprising a plurality of columns, each column comprising a plurality of the displaying means; means for writing display data to said displaying means; means for applying a first series of bias voltages of alternating polarity to a first set of columns of the array; and means for applying a second series of bias voltages of alternating polarity to a second set of columns of the array; wherein a polarity of the bias voltages received by the columns of the first set is opposite a polarity of the bias voltages received by the columns of the second set during said applying of the first series and said applying of the second series, wherein actuated displaying means in the first and second sets of columns remain actuated while the first and second series are applied, and wherein unactuated displaying means in the first and second sets of columns remain unactuated while the first and second series are applied, and wherein a transition time between bias potentials applied to the same column is less than or equal to τ
iMoD+τ
RC, wherein τ
iMoD comprises a constant of said display elements determined with reference to physical characteristics of said display elements, and wherein τ
RC comprises a constant related to electrical characteristics of a circuit providing the bias potentials. - View Dependent Claims (29, 30)
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Specification