Browse Prior Art Database

Fingerprint Proof Display

IP.com Disclosure Number: IPCOM000050552D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Young, JER: AUTHOR

Abstract

A CRT display laminated face-plate having an efficient anti-reflective coating is provided with a specially patterned non-continuous thin film layer, the purpose of which is to camouflage fingerprints and smudges which would otherwise be conspicuous on the non-reflecting surface.

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Fingerprint Proof Display

A CRT display laminated face-plate having an efficient anti-reflective coating is provided with a specially patterned non-continuous thin film layer, the purpose of which is to camouflage fingerprints and smudges which would otherwise be conspicuous on the non-reflecting surface.

Fig. 1 shows a diagrammatic cross-section of a face-plate assembly for a CRT display. The CRT glass envelope 1 is colored to enhance contrast and carries the phosphor layer 2 on its inside surface, and the front glass 3 is provided on its external surface with an anti-reflective coating 4. The specially patterned non-continuous thin film layer 5 is provided between the two, which are glued together by an index-matching epoxy layer 6.

The film layer 5 is formed as a granular metal laid down by chemical deposition on the inside surface of the front glass 3 and etched to the predetermined special pattern. This pattern is selected so that the highly reflective and partly diffuse portions of the remaining metal visible through the front glass reflect and diffuse about 4 percent of the incident ambient light. The reflective characteristics of the front glass treated in this way is substantially similar to that of actual fingerprints on glass and, since it extends uniformly over the entire surface of the front glass, ensures that subsequent real fingerprints made on the screen remain unobtrusive.

The pattern, which is repetitive, may clearly take any of several alterna...