Browse Prior Art Database

X Y Addressed Ferrofluid Display

IP.com Disclosure Number: IPCOM000085363D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Romankiw, LT: AUTHOR [+2]

Abstract

The basic principle of this display involves a short-range movement of the ferrofluid droplet between two possible positions. The first position is exposed to the view of the observer through an opening in a mask. In the second position, the droplet is hidden behind the mask.

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X Y Addressed Ferrofluid Display

The basic principle of this display involves a short-range movement of the ferrofluid droplet between two possible positions. The first position is exposed to the view of the observer through an opening in a mask. In the second position, the droplet is hidden behind the mask.

A ferrofluid display includes a pinhole mask 10 with apertures 11. A number of opaque ferrofluid droplets 12, 13, 14 suspended in a transparent host fluid are located in display chambers 15 which are separated by barrier strips 16, and are sealed by glass top cover 17 and Schott glass layer 18 on the bottom. Additional transverse barrier strips 16 are to be provided transversely to provide an X-Y matrix.

Droplet 12 is visible to a viewer looking through the hole 11 above the chamber 15 holding droplet 12. Droplet 12 has been attracted to that position by "on" peg 19, which was turned on by half-select wires 21, 22.

The erase pin 20 is activated by half-select wires 23, 24 which are for a line erase function in Fig. 2, which is a cross-sectional plan view of the X-Y erase lines along line A-A in Fig. 1 or an X-Y erase function in Fig. 3, also taken along line A-A in Fig. 1. A permanent magnet 30 provides memory by maintaining a small magnetic bias on the ferrofluid droplets constantly.

The current through the address wires 21,22 is set so the ferrofluid drop is attracted only when both the X and Y wires are pulsed. Flux through the peg 19 can be concentrated b...