seconddisplay
nounUK /ˌsekənd dɪˈspleɪ/
US /ˌsekənd dɪˈspleɪ/
A second screen that shows the same or extra pictures next to your main screen.
She put the map on the second display so she could still see her game.
OTHER MEANINGS
2. A screen attached to a computer to show more information at once.
He dragged the chat window to the second display.
3. A smaller screen on a phone or watch that shows quick updates.
The watch's second display shows the time and steps.
4. A backup screen used when the main one stops working.
The pilot checked the second display after the main screen went dark.