AN EVALUATING METHOD FOR ELECTRICAL SURFACE CHARGE DENSITY OF POLYMER FILM POLYIMIDE FILM WITH IMPROVED SURFACE CHARGE DENSITY AND FLEXIBLE DEVICE USING SAME

摘要

The present invention provides a method for more accurately evaluating the surface insulation properties of a polymer film, and also provides a polyimide film having a saturation electrification voltage of 1.25 kV and a half-life exceeding 116 seconds as a flexible substrate using the method By doing so, it is possible to provide a flexible device with improved surface insulation properties.