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CURSOR FUNCTION FOR A RUTICON BASE PROJECTION DISPLAY SYSTEM

IP.com Disclosure Number: IPCOM000023662D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is the use of two color optical screens under a photoconductor which is part of a Ruticon system, which screens would be at a 900 angle. Envisioning a panchromatic photoconductor Ruticon, the horizontal screen can be magenta while the vertical screen is yellow, and in a preferred embodiment, green light can be modulated by the magenta screen while blue light will be modulated by the yellow screen. When a regular text is entered from a green light source, such as an appropriately filtered cathode ray tube, the cursor infor-mation is entered in both blue and green color. In view of the orientation of the magenta and yellow screens, the green input information will produce diffraction in the vertical direction while the blue input will produce diffraction in a horizontal direction when the Ruticon system is illuminated with read-out light. The two kinds of output can be separated in Fourier space by a specially constructed spatial and color filter combination. This filter could be a horizontal slit with an opening in the middle, the height and width of this opening being such that it would not let through the zeroth order information from both the yellow and magenta screens. On either side of the open screen the slit could be covered by a red filter, thus light diffracted by the yellow screen would be projected as red light to the read-out image plane.