METHODS FOR DRIVING ELECTRO-OPTIC DISPLAYS
First Claim
1. A method of driving a bistable electro-optic display having at least first and second pixels each of which can display first and second extreme optical states, the first and second pixels having adjacent edges separated by an inter-pixel gap, the method comprising:
- applying to the first pixel a drive pulse effective to cause the first pixel to change its optical state to one of its extreme optical states, and applying to the second pixel, which is in the said one extreme optical state, a reinforcing pulse of the same polarity as the drive pulse, the reinforcing pulse being applied either simultaneously with the drive pulse or within a predetermined period after the end of the drive pulse.
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Abstract
Methods are provided for of driving a bistable electro-optic display having at least first and second pixels separated by an inter-pixel gap. In one method, there is applied to the first pixel a drive pulse which drives the pixel to one extreme optical state, and there is applied to the second pixel, which is in this extreme optical state, a reinforcing pulse of the same polarity as the drive pulse. In a second method, a drive pulse applied to the first pixel drives that pixel away from one extreme optical state, and an inverse reinforcing pulse applied to the second pixel is of opposite polarity to the drive pulse. The drive methods reduce edge ghosting or blooming.
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Citations
46 Claims
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1. A method of driving a bistable electro-optic display having at least first and second pixels each of which can display first and second extreme optical states, the first and second pixels having adjacent edges separated by an inter-pixel gap, the method comprising:
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applying to the first pixel a drive pulse effective to cause the first pixel to change its optical state to one of its extreme optical states, and applying to the second pixel, which is in the said one extreme optical state, a reinforcing pulse of the same polarity as the drive pulse, the reinforcing pulse being applied either simultaneously with the drive pulse or within a predetermined period after the end of the drive pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An electro-optic display comprising a layer of bistable electro-optic medium which can display first and second extreme optical states, first and second pixel electrodes disposed adjacent the layer of bistable electro-optic medium and capable of applying electric fields to the medium, the first and second pixel electrodes having adjacent edges separated by an inter-pixel gap, and a controller for controlling the voltages applied to the first and second pixel electrodes, wherein the controller is arranged to carry out a drive method comprising:
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applying to the first pixel electrode a drive pulse effective to cause the electro-optic medium adjacent the first pixel electrode to change its optical state to one of its extreme optical states, and applying to the second pixel electrode, while the electro-optic medium adjacent the second pixel electrode is in the said one extreme optical state, a reinforcing pulse of the same polarity as the drive pulse, the reinforcing pulse being applied either simultaneously with the drive pulse or within a predetermined period after the end of the drive pulse. - View Dependent Claims (23)
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24. A method of driving a bistable electro-optic display having at least first and second pixels each of which can display first and second extreme optical states, the first and second pixels having adjacent edges separated by an inter-pixel gap, the method comprising:
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applying to the first pixel a drive pulse effective to cause the first pixel to change its optical state from one of its extreme optical states, and applying to the second pixel, which is in the said one extreme optical state, an inverse reinforcing pulse of the opposite polarity to the drive pulse, the inverse reinforcing pulse being applied either simultaneously with the drive pulse or within a predetermined period after the end of the drive pulse. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An electro-optic display comprising a layer of bistable electro-optic medium which can display first and second extreme optical states, first and second pixel electrodes disposed adjacent the layer of bistable electro-optic medium and capable of applying electric fields to the medium, the first and second pixel electrodes having adjacent edges separated by an inter-pixel gap, and a controller for controlling the voltages applied to the first and second pixel electrodes, wherein the controller is arranged to carry out a drive method comprising:
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applying to the first pixel a drive pulse effective to cause the first pixel to change its optical state from one of its extreme optical states, and applying to the second pixel, which is in the said one extreme optical state, an inverse reinforcing pulse of the opposite polarity to the drive pulse, the inverse reinforcing pulse being applied either simultaneously with the drive pulse or within a predetermined period after the end of the drive pulse. - View Dependent Claims (46)
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Specification