Display Screen has a shadow

"Hi, when i open dark screen at my macbookair. i can see little red or purple shadow but it's only for dark color. When i open some white color its gone. im sharing to picture than you can easly see it. Thank you Display Screen has a shadow"

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Thank you for the screenshot.

Get this Serviced:

This is a pixelation error. As you might suspect, no one here would know the official reason for this occurrence, being these are just forums. The pixels on your screen are failing. So, how old is this device? If it is covered under warranty, then contact Apple Support, seeing if you can get this screen replaced. Note that you have a one-year, out-of-the-box, limited-warranty with this, if purchased from Apple.

Contact Apple Support:

• Contact Us - Choose Locations
• Proceed from there as necessary

Note: Phone calls are taking a bit to go through at the moment, due to lots of calls. And that makes sense because with the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

B. Contacting an AASP: 

Also, take this to an AASP (Apple Authorized Service provider), asking for assistance.

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the iPhone

Or...

C. A Retailer:

Contact your local retailer, seeing if they replace these slots.