Stylus writing architectures for erasable paper

A method for writing and erasing an electric writeable medium comprising a backplane electrode, a display layer coupled to the backplane electrode, a resistive layer coupled to the display layer, and a plurality of island electrodes coupled to the resistive layer, wherein the display layer includes a plurality of elements in an enabling medium, the method comprising:

• applying a first voltage differential between a stylus and the backplane electrode, wherein the first voltage differential is sufficient to cause one or more of the elements in the display layer to display a first color;
• depositing charge on one or more island electrodes using the stylus, the island electrodes being positioned within recesses formed in an upper portion of the resistive layer, wherein a top surface of the resistive layer laterally abuts a top surface of the island electrodes such that the top surfaces of the resistive layer and the island electrodes each separately form portions of a top surface of a contiguous planar surface and a lower portion of the resistive layer extends continuously underneath the entire island electrodes, wherein the resistive layer has a sufficiently high resistivity substantially inhibit the charge deposited on one island electrode from spreading laterally through the resistive layer to an adjoining island electrode;
• and
• applying a second voltage differential, inverse to the first voltage differential, between the resistive layer and the backplane electrode, wherein the second voltage differential is sufficient to cause the elements in the display layer to display a second color.

A method for writing and erasing an electric writeable medium comprising a backplane electrode, a display layer coupled to the backplane electrode, a photoconductive layer coupled to the display layer, and a plurality of island electrodes coupled to the photoconductive layer, wherein the display layer includes a plurality of elements in an enabling medium, the method comprising:

• applying a first differential voltage between a stylus and the backplane electrode, wherein the first voltage differential is sufficient to cause one or more of the elements in the
• display layer to display a first color;
• depositing charge on one or more portions of the electric writeable medium by applying the stylus to at least one of the island electrodes, the island electrodes being positioned within recesses formed in an upper portion of the photoconductive layer, wherein a top surface of the photoconductive layer laterally abuts a top surface of the island electrodes such that the top surfaces of the photoconductive layer and the island electrodes each separately form portions of a top surface of a contiguous planar surface and a lower portion of the photoconductive layer extends continuously underneath the entire array of electrodes;
• applying a second voltage differential, inverse to the first voltage differential, between the photoconductive layer and the backplane electrode, wherein the second voltage differential is sufficient to cause the elements in the display layer to display a second color;
• and
• illuminating the photoconductive layer to conduct the second differential voltage across the elements in the display layer.

An electric writeable medium comprising:

• a layer of a conductive material;
• a first layer of a film coupled to the layer of conductive material;
• a display layer, coupled to the first layer of film, for writing or display of content, wherein the display layer includes a plurality of elements in an enabling medium;
• a second layer of a film coupled to the display layer;
• a layer of resistive material coupled to the second layer of film;
• and
• a plurality of electrodes positioned within recesses formed in an upper portion of the resistive layer such that a top surface of the resistive layer laterally abuts a top surface of the electrodes such that the top surfaces of the resistive layer and the electrodes each separately form portions of a top surface of a contiguous planar surface and a lower portion of the resistive layer extends continuously underneath the entire array of electrodes.

An electric writeable medium comprising:

• a layer of a conductive material;
• a first layer of a film coupled to the layer of conductive material;
• a display layer, coupled to the first layer of film, for writing or display of content, wherein the display layer includes a plurality of elements in an enabling medium;
• a second layer of a film coupled to the display layer;
• and
• a layer of photoconductive material coupled to the second layer of film;
• and
• a plurality of electrodes positioned within recesses formed in an upper portion of the photoconductive layer such that a top surface of the photoconductive layer laterally abuts a top surface of the electrodes such that the top surfaces of the photoconductive layer and the electrodes each separately form portions of a top surface of a contiguous planar surface and a lower portion of the photoconductive layer extends continuously underneath the entire array of electrodes.