Image sticking, also known as “image retention” or “ghost image”, is a phenomenon in which the displayed image stays faintly visible after changing the content. This phenomenon has been known since the birth of the LCD display and continues to bother panel manufacturers and end users to this day.

In some cases, displays must withstand extreme conditions. This could be in industrial environments, public spaces or transportation. Two essential factors that determine the resilience and longevity of displays are the IK ratings and the thickness of the cover lens. This article explores the significance of these protective measures and explains how they contribute to making displays reliable and durable in demanding environments. It covers both the classification according to IK protection standards and the choice of optimal thickness of cover lenses to ensure a balanced relationship between protection and functionality.