Browse Prior Art Database

EMI Suppression Display Screen

IP.com Disclosure Number: IPCOM000036826D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Cox, RE: AUTHOR

Abstract

This article discloses a low cost solution to a very difficult problem faced by all manufacturers of cathode ray tube (CRT) displays: how to eliminate possible detrimental effects of CRT electromagnetic interference (EMI) and other electrical emanations coming through the face of the display screen. Also, it is intended to suppress EMI screen emanations such that they are not compromising in terms of government and industry specifications. In the prior art, this has been accomplished by adding to the CRT face: glass- or plastic-laminated copper mesh screens, glass- or plastic-laminated stainless steel mesh screens, conductively coated glass or plastic screens or other similar means of protection.

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EMI Suppression Display Screen

This article discloses a low cost solution to a very difficult problem faced by all manufacturers of cathode ray tube (CRT) displays: how to eliminate possible detrimental effects of CRT electromagnetic interference (EMI) and other electrical emanations coming through the face of the display screen. Also, it is intended to suppress EMI screen emanations such that they are not compromising in terms of government and industry specifications. In the prior art, this has been accomplished by adding to the CRT face: glass- or plastic-laminated copper mesh screens, glass- or plastic-laminated stainless steel mesh screens, conductively coated glass or plastic screens or other similar means of protection. In all of these screens, cost is high due to complex process requirements including proper ground termination to achieve the required attenuation characteristics. Similarly, in general display applications, many types of protective screens have been devised to offer glare protection, color tinting, operator (user) protection, etc., and range from simple non-effective low cost types to more expensive types such as those that are bonded directly to the CRT face at the factory. The subject EMI suppression display screen accomplishes the above protection by providing a simple low cost design whereby a copper mesh pattern is obtained on the screen through the use of photo-etch-type manufacturing techniques such as that used for integrated circuit/board manufacture. Thus, an equal or better mesh quality can be obtained than that of the aforementioned existing prior art, yet at much lower cost.

Thus, if a copper/glass- or plastic-laminated screen material were used and a desired photographic pattern applied as in the photo- lithographic process, a fine mesh pattern can be obtained by etching away the copper in the desired light transmission area while leaving the copper in the desired conductive EMI suppression area. The resultant pattern made by the photo-etch process will provide a mesh screen effect which has equivalent or better conductive character...