Method of operation for reducing power, increasing life and improving performance of EPIDs
First Claim
Patent Images
1. A method of holding an image in a hold mode on an electrophoretic display panel having at least one anode electrode and a plurality of cathode and grid electrodes after the image was written by applying a first positive voltage to said at least one anode electrode, the method comprising the steps of:
- applying a second positive voltage to the anode electrode;
applying a third positive voltage to a cathode electrode; and
applying a negative voltage to a grid electrode;
wherein said first positive voltage is at least 50 times greater than said second positive voltage.
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Abstract
Method for operating an electrophoretic display panel in a hold mode that reduces power required, increases display life and improves performance which entails applying a voltage to the anode electrode structure during the "hold" mode of operation which is substantially lower in amplitude than the voltage applied to the anode structure during a "write" mode of operation.
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Citations
9 Claims
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1. A method of holding an image in a hold mode on an electrophoretic display panel having at least one anode electrode and a plurality of cathode and grid electrodes after the image was written by applying a first positive voltage to said at least one anode electrode, the method comprising the steps of:
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applying a second positive voltage to the anode electrode; applying a third positive voltage to a cathode electrode; and applying a negative voltage to a grid electrode;
wherein said first positive voltage is at least 50 times greater than said second positive voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of holding an image in a hold mode on an electrophoretic display panel having an anode electrode and cathode and grid electrodes after the image was written by applying a first positive voltage to an anode electrode, the method comprising the steps of;
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applying another positive voltage to the anode electrode, said step of applying said another positive voltage being performed immediately after the image was written such that particles written to the anode to make the image are retained thereon; applying a positive voltage to a cathode electrode; and applying a negative voltage to a grid electrode, said step of applying another positive voltage occurring immediately after the image was written, wherein said first positive voltage is about 200 volts, with said another positive voltage being between 1 to 4 volts, whereby said first positive voltage is at least 50 times greater in amplitude than said another positive voltage.
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9. A method of holding an image on an electrophoretic display panel after the image was written by applying a first positive voltage to an anode electrode, the method comprising the steps of:
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applying another positive voltage to the anode electrode; applying a positive voltage to a cathode electrode; and applying a negative voltage to a grid electrode, wherein the amplitude of said another positive voltage is substantially lower than the amplitude of the first positive voltage, whereby pigment particles written to the anode to make the image are retained thereon, and wherein said first positive voltage is about 200 volts, with said another positive voltage being between 1 to 4 volts, whereby said first positive voltage is at least 50 times greater than said another positive voltage.
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Specification