flickering on screen

[sparkleblue]

Ok here's what my desktop looks like. I actually couldn't do a screenshot so I recreated what it looks like in photoshop. On the right side, it's not smooth, it's separated and flickering. What can I do?

I've got a MacBook pro late 2012 retina.
13 inch
macOS sierra 10.12.2
Intel HD Graphics 4000 1536 MB
2.5 GHz Intel Core i5

 

[sparkleblue]

anyone know?

 

[tubeexperience]

Take a photo

 

[sparkleblue]

I guess it didn't post. Here's another photo

 

[tubeexperience]

Connect the laptop to an external display.

If it happens on an external display, it's a dGPU issue.

If it doesn't happen on an external display, it's an internal display issue.