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Ion Depletion Projection Display

IP.com Disclosure Number: IPCOM000040371D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Hoffman, HS: AUTHOR

Abstract

This article describes a display provided by an array of cells, the index of refraction of which is varied by selective application of electric fields. As shown in the figure, the operation of the display is by variation of the ion concentration in an array of fluid-filled cells 10, 12 so as to switch them selectively between states in which they provide a total internal reflection interface with a plate 14 and in which they do not. The index of refraction of a solution is, among other factors such as temperature, dependent on the concentration. If the solution in the cells is ionic then an electrostatic field can separate the ions and, more importantly collect them as a wall charge on a dielectric. This depletes the concentration of the solute in the bulk of the solution.

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Ion Depletion Projection Display

This article describes a display provided by an array of cells, the index of refraction of which is varied by selective application of electric fields. As shown in the figure, the operation of the display is by variation of the ion concentration in an array of fluid-filled cells 10, 12 so as to switch them selectively between states in which they provide a total internal reflection interface with a plate 14 and in which they do not. The index of refraction of a solution is, among other factors such as temperature, dependent on the concentration. If the solution in the cells is ionic then an electrostatic field can separate the ions and, more importantly collect them as a wall charge on a dielectric. This depletes the concentration of the solute in the bulk of the solution. Nullification of the field can return the solution to its original concentration. Thus, by providing the cells with electrodes 16, 18, 20, 22 and edge-lighting the plate 14, selective frustration of the total internal reflection of the light is the selection mechanism. The surface of the electrodes scatters the light 26 which enters "on" cells, such as the cell 12. A projection of this scattered light 28 by a suitable lens system 30 will provide an image of pels formed by "on" cells. The enlargement possible from projection allows the use of a small area, high resolution active matrix. This allows the use of a single- crystal active matrix for the electrode arra...