FLEX TAPE PROTECTIVE COATING

A flexible tape such as TAB or FLEX tape having conducting leads extending in cantilevered fashion over an edge of a dielectric layer preferably a flexible dielectric layer. A photosensitive dielectric coating is disposed on the part of the leads which lie on the dielectric layer. The protective die...

Full description

Saved in:
Bibliographic Details
Main Authors GREBE, KURT RUDOLPH, YEH, HELEN LI, GRAHAM, TERESITA ORDONEZ, FEGER, CLAUDIUS, TANNER, NELSON RUSSELL, TONG, HO-MING, WILSON, CHARLES HAILE, LIUTKUS, JOHN JOSEPH, LANZETTA, ALPHONSO PHILIP, MATTHEW, LINDA CAROLYN, PALMER, MICHAEL JON
Format Patent
LanguageEnglish
Published 21.07.1993
Edition5
Subjects
BASIC ELECTRIC ELEMENTS
CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS
CURRENT COLLECTORS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
LINE CONNECTORS
MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
PRINTED CIRCUITS
SEMICONDUCTOR DEVICES
Online AccessGet full text

Cover

More Information
Summary:A flexible tape such as TAB or FLEX tape having conducting leads extending in cantilevered fashion over an edge of a dielectric layer preferably a flexible dielectric layer. A photosensitive dielectric coating is disposed on the part of the leads which lie on the dielectric layer. The protective dielectric coating is aligned to the edges of the dielectric layer by a self aligning technique. A liquid polymer is disposed on the dielectric layer. The protective dielectric layer prevents the formation of conductive dendrites bridging adjacent conductors. Without this protection dendrites form between adjacent conductors held at different potentials because of residual water on the dielectric layer which acts as an electrolyte resulting in metal being plated from one line onto another line which builds up as a dendrite which eventually shorts adjacent lines.
Bibliography:Application Number: EP19920113575