Browse Prior Art Database

Dynamic Liquid Filter or Color Display Liquid Filter

IP.com Disclosure Number: IPCOM000076733D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hairabedian, BZ: AUTHOR

Abstract

This light filtering device consists of two transparent planes, between which transparent fluids of two or more colors are injected and removed sequentially at a fast repetition rate. When the filter is interposed between an image source, such as a cathode-ray tube and a viewer and the image is displayed selectively in time-coincidence with the color change, a colored display will result.

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Dynamic Liquid Filter or Color Display Liquid Filter

This light filtering device consists of two transparent planes, between which transparent fluids of two or more colors are injected and removed sequentially at a fast repetition rate. When the filter is interposed between an image source, such as a cathode-ray tube and a viewer and the image is displayed selectively in time-coincidence with the color change, a colored display will result.

A two-color filter is shown in cross section. Figs. 1 and 2 represent two successive phases of its operation. "A" and "B" are two solid transparent planes which form the outside boundaries of the filter. "C" is a thin transparent diaphragm capable of flexing which separates two different-colored liquids. The liquids are forced in and out by a suitable oscillating pump.

In Fig. 1, the chamber between plates A and B is filled with red liquid and the display image (Light Source) appears red. In Fig. 2, blue-green liquid has displaced the red liquid, changing the apparent color of the display. Diaphragm C prevents intermixing of the two liquids. For additional colors, additional diaphragms and corresponding plumbing are included in the same filter. Alternatively, two or more separate filters can be used in series to provide color blends. In any case, one of the fluids can be colorless, if desired.

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