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Multicolored Laser System for Small Technicolor Displays

IP.com Disclosure Number: IPCOM000080892D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

von Gutfeld, RJ: AUTHOR

Abstract

A scheme for obtaining the three primary colors using laser light, and a way for utilizing this in small displays are described.

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Multicolored Laser System for Small Technicolor Displays

A scheme for obtaining the three primary colors using laser light, and a way for utilizing this in small displays are described.

A pulsed nitrogen laser is utilized to pump small columnar dye cells mounted on a rotary drum. The dye cells, as illustrated by Fig. 1, alternate with dyes that lase in the three primary colors: blue, green, red. There are many dyes available that lase in this spectral range. The rotary drum spins so that one cell is pumped with each nitrogen laser pump pulse. The spinning of the drum is in phase with the nitrogen pump rate through a suitable control unit. The output of the laser dye is deflected via an oscillating mirror or other scanner.

The intensity and color hue on the screen can be varied by controlling the pump pulse amplitude to one or more of the primary color dye cells, for a period during which the scanner is stationary.

In this mode, light from more than one cell reaches the viewing screen and the persistence of vision interprets this as a color mixing process.

The cells are constructed with a taper for both top and bottom output windows, as shown by Fig. 2. This assures filling of the cell space by the dye to be pumped by the N(2) laser, with the centrifugal force maintaining the liquid in the outer periphery of the cell. For pulse rates in the kilohertz range, dye circulation may be required. However, below that rate none should be necessary. Commercial nitrogen lase...