Electrophoretic display film for anti-counterfeit application

摘要

The present invention is directed to an electrophoretic display film which can be controlled to malfunction permanently within a period of time. It provides an elegant method to utilize an electrophoretic film for anti-counterfeit purposes. The concept involves the removal of strong barrier layer(s) from the film to allow the solvent in the electrophoretic fluid within the film to evaporate through weak barrier layer(s), and within a period of time, the performance of the display film will be significantly degraded and the film cannot be re-used.

主权项

1. A module comprising an electrophoretic display film, wherein the film
a) comprises a microcup layer having (i) partition walls, (ii) a microcup bottom layer, and (iii) microcups filled with an electrophoretic fluid comprising charged pigment particles dispersed in a solvent, wherein the microcup layer is sandwiched between a first stack of layers and a second stack of layers, and each of the stack of layers comprises one or more strong barrier layers; and b) shows a contrast ratio of less than 3, after the one or more strong barrier layers are removed to allow the solvent to evaporate.