The ELAN Keyboard Filter Device is a driver associated with ELAN Touchpad/Keyboard Controllers, often found on laptops and devices using ELAN's input devices. ELAN is a company that specializes in touchpad technology, and their drivers typically control the behavior of the touchpad and keyboard on laptops, especially in terms of features like gesture support, multi-touch input, and advanced keyboard functionality.

The ELAN Keyboard Filter Device driver specifically helps manage the filtering or processing of input from the keyboard, particularly in relation to its interaction with the touchpad. It might be used in systems where there are advanced touchpad functions, such as palm rejection, or where the keyboard and touchpad need to work together without causing interference.