In the case of the 2015-vintage Wacom Cintiq Companion 2, this turns out to be the so-called Athena chip, which switches the display input between the HDMI port and internal display controller.

Wacom, purveyors of fine pen tablets for digital artists ... The second product line, the Cintiq, takes the same technology and adds an LCD to the mix, effectively turning a drawing tablet ...

Wacom’s Cintiq line and other pen displays (also known as graphics tablets or pen tablets) build the tracking technology into a display, allowing you to draw directly on them. These devices are ...

Every brush stroke and pen display should perfectly align with the creator's vision. Drawing tablets with screens are known as pen displays, while those devices without a physical touchscreen ...