If "display" means to show or exhibit something:
* Conceal: To hide or keep secret.
* Hide: To put out of sight.
* Suppress: To hold back or prevent from being seen.
* Withhold: To keep back from being given or shown.
* Secrete: To hide something in a secret place.
If "display" means to show information on a screen:
* Off: The opposite of "on" in terms of electronic devices.
* Hidden: Not visible on the screen.
* Minimized: Reduced in size or hidden.
* Closed: Not open or visible.
If "display" refers to the act of showing emotion:
* Suppress: To hold back or restrain an emotion.
* Conceal: To hide an emotion.
* Mask: To cover up an emotion with a different expression.
To give you a more accurate opposite, please provide more context about how you are using the word "display."