There are a few ways to recognize whether a display is from Dell:

1. Look for the Dell logo: Most Dell displays will have the Dell logo on the front or back of the display. It may also be printed on the power supply, cables, or documentation that came with the display.

2. Check the model number: if you have the model number of the display, you can search for it online and see if it’s a Dell product.

98CM4 – HD7F8 – 12.5″ For Dell XPS 12 (9Q23) LCD Screen Display with Digitizer

3. Check the settings menu: many Dell displays have a built-in settings menu that can be accessed through buttons on the display or via software on your computer. If you see “Dell” or “Dell Display” in the menu, it’s likely a Dell display.

4. Check the warranty information: if you still have the warranty information for the display, it should indicate whether it was made by Dell or not.

If none of these methods work, you could try contacting Dell customer support and providing them with the serial number or other identifying information to see if they can confirm whether it’s a Dell product or not.