Methods for controlling electro-optic displays
First Claim
1. An electro-optic display comprising:
- a layer of a bistable electro-optic medium;
a plurality of pixel electrodes disposed on one side of the layer of electro-optic medium, at least one of the pixel electrodes being a sensor pixel electrode;
at least one non-linear element associated with each pixel electrode;
pixel drive means arranged to apply voltages to the pixel electrodes via the non-linear elements, the pixel drive means being arranged to apply a predetermined voltage to the input of the non-linear element associated with the at least one sensor pixel electrode;
a common electrode on the opposed side of the layer of electro-optic medium from the pixel electrodes; and
measuring means arranged to receive the predetermined voltage and the voltage on the at least one sensor pixel electrode and to determine the difference therebetween.
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Abstract
An electro-optic display comprises a bistable electro-optic medium, a plurality of pixel electrodes, with associated non-linear elements, and a common electrode, disposed on opposed sides of the electro-optic medium. The display has a writing mode, in which at least two different voltages are applied to different pixel electrodes, and a non-writing mode in which the voltages applied to the pixel electrodes are controlled so that any image previously written on the electro-optic medium is substantially maintained. The display is arranged to apply to the common electrode a first voltage when the display is in its writing mode and a second voltage, different from the first voltage, when the display is in its non-writing mode.
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Citations
20 Claims
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1. An electro-optic display comprising:
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a layer of a bistable electro-optic medium; a plurality of pixel electrodes disposed on one side of the layer of electro-optic medium, at least one of the pixel electrodes being a sensor pixel electrode; at least one non-linear element associated with each pixel electrode; pixel drive means arranged to apply voltages to the pixel electrodes via the non-linear elements, the pixel drive means being arranged to apply a predetermined voltage to the input of the non-linear element associated with the at least one sensor pixel electrode; a common electrode on the opposed side of the layer of electro-optic medium from the pixel electrodes; and measuring means arranged to receive the predetermined voltage and the voltage on the at least one sensor pixel electrode and to determine the difference therebetween. - View Dependent Claims (2, 3, 4, 5)
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6. An electro-optic display comprising:
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a layer of a bistable electro-optic medium; a plurality of pixel electrodes disposed on one side of the layer of electro-optic medium; at least one non-linear element associated with each pixel electrode; pixel drive means arranged to apply voltages to the pixel electrodes via the non-linear elements; a common electrode on the opposed side of the layer of electro-optic medium from the pixel electrodes; a common electrode voltage supply line arranged to supply at least one voltage; switching means connecting the voltage supply line to the common electrode, the switching means having an operating condition in which the voltage supply line is connected to the common electrode, and a testing condition in which the voltage supply is disconnected from the common electrode, thereby allowing the voltage on the common electrode to float, the pixel drive means being arranged to supply a single predetermined voltage via the non-linear elements to all the pixel electrodes when the switching means is in its testing condition, the display further comprising measuring means arranged to receive the single predetermined voltage and the voltage on the common electrode when the switching means is in its testing condition and to determine the difference therebetween. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of operating an electro-optic display comprising:
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a layer of a bistable electro-optic medium; a plurality of pixel electrodes disposed on one side of the layer of electro-optic medium; at least one non-linear element associated with each pixel electrode; pixel drive means arranged to apply voltages to the pixel electrodes via the non-linear elements; a single common electrode on the opposed side of the layer of electro-optic medium from the pixel electrodes; the method comprising; applying by means of the pixel drive means a predetermined voltage to all the pixel electrodes of the display; storing a value representative of the difference between the predetermined voltage and the voltage appearing on the single common electrode during application of the predetermined voltage to the pixel electrodes; and thereafter applying to the single common electrode a voltage dependent upon the stored value, while applying the pixel electrodes voltages which cause an image to be written upon the electro-optic medium. - View Dependent Claims (14, 15, 16, 17, 20)
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18. A method of operating an electro-optic display comprising:
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a layer of a bistable electro-optic medium; a plurality of pixel electrodes disposed on one side of the layer of electro-optic medium; at least one non-linear element associated with each pixel electrode; pixel drive means arranged to apply voltages to the pixel electrodes via the non-linear elements; a common electrode on the opposed side of the layer of electro-optic medium from the pixel electrodes; the method comprising; applying by means of the pixel drive means a predetermined voltage to all the pixel electrodes of the display; storing a value representative of the difference between the predetermined voltage and the voltage appearing on the common electrode during application of the predetermined voltage to the pixel electrodes; and thereafter applying to the common electrode a voltage dependent upon the stored value, while applying the pixel electrodes voltages which cause an image to be written upon the electro-optic medium, wherein said value is stored in an analog sample-and-hold circuit. - View Dependent Claims (19)
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Specification