Browse Prior Art Database

Liquid Crystal Image Intensifier and Recorder

IP.com Disclosure Number: IPCOM000091207D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Kazan, B: AUTHOR

Abstract

This device intensifies very weak optical input images, converts X-ray and infrared images to visible images, and records transient optical images.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 60% of the total text.

Page 1 of 2

Liquid Crystal Image Intensifier and Recorder

This device intensifies very weak optical input images, converts X-ray and infrared images to visible images, and records transient optical images.

The device is a sandwich type arrangement of a photoconductive layer 1 in contact with a thin layer of nematic liquid crystal 2. By use of transparent conductive surfaces 3, a voltage can be applied across these layers 1 and 2. Spacers 4 are provided, as well as glass supports 5.

When an input image, represented by arrow 6, is projected onto photoconductor 1, a pattern of conductivity is created. If switch S is momentarily closed, a voltage is applied across the device and a corresponding pattern of currents flows through liquid crystal 2, causing light scattering in local areas of liquid crystal 2 through which current has passed. If the surface of photoconductor 1 is covered with a mosaic of reflecting metal squares 7, a pattern of scattered light is produced when liquid crystal 2 is illuminated by light 8, which can be seen by the observer as a visible image by reflection.

If switch S is maintained closed, a moving input image of low intensity is seen as an output image of much greater brightness. If photoconductor 1 is responsive to X-rays or infrared rays, input images of these wavelengths are converted to visible images.

If switch S is normally maintained open, but is momentarily closed, an electronic shutter action is obtained since the liquid crystal 2 is activated...