A Method to Improve the Lifetime of Microcapsule Electrophoretic Display Modules

Abstract

Microcapsule electrophoretic display (MED) is a kind of display with the properties of reflectivity and low power consumption. It is widely used in electronic book readers, but some new applications have appeared in the Internet of Things (IoT) products. Long working time is required in IoT products because it is not easy to replace or install such displays. The main failure phenomenon is the mura that will appear after about 1 to 2 years of use. The root cause of the failure is analyzed, and the lifetime prediction models for MED are introduced. The high temperature and high humidity (HTHH) test is used to evaluate the protective effect of the packaging structure. The HTHH test result is reported for the new MED structure; it shows that the MED with the new structure involves a longer working time.

Keywords

• electronic paper display (EPD)
• microcapsule electrophoretic display (MED)
• Internet of Things (IoT)
• lifetime prediction models
• HTHH
• RH (RH relative humidity)