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Matrix Addressed Magnetophoretic Display

IP.com Disclosure Number: IPCOM000087643D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Brandon, M: AUTHOR [+2]

Abstract

The magnetophoretic display shown in the figure consists of a screen 1 of transparent or translucent material molded to define a regular array of identical light cells 2 over one surface and a further corresponding array of core-locating pockets 3 over the other surfaces. Each light cell 2 defines a display element and is filled with an almost clear liquid suspension of fine magnetophoretic particles.

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Matrix Addressed Magnetophoretic Display

The magnetophoretic display shown in the figure consists of a screen 1 of transparent or translucent material molded to define a regular array of identical light cells 2 over one surface and a further corresponding array of core-locating pockets 3 over the other surfaces. Each light cell 2 defines a display element and is filled with an almost clear liquid suspension of fine magnetophoretic particles.

A magnetic core 4 is located in each of the core pockets 3 and is threaded through its central aperture 5 with so-called X wires 6 and Y wires 7 in a conventional manner to produce an addressable core matrix. In addition to the central aperture 5, each core is provided with a slot 8 in that part of its periphery which is closest to its corresponding light cell 2 on the opposite side of the screen. A single continuous display wire 9 passes through the slots 8 of all the cores. The cores are held in place by a molded transparent base plate 10.

Initially, all the cores 4 are in a demagnetized state. By appropriate energization of the X and Y wires selected ones of the magnetic cores 4 are magnetized with the rest remaining in the demagnetized state. Since each core provides a closed flux path, as shown by the dotted line 11, there is very little leakage of flux around the core, and the magnetophoretic particles in the light cells 2 are unaffected by the magnetic state of the cores.

Upon subsequent energisation of the wire 9 with the current of a polarity such as to set up an opposing flu...