A line of pixels go black across screen?

Sometimes when I open the lid of my Retina Macbook Pro, there is a horizontal black line which looks to me as if they're dead pixels. They'll go away after I open any app and only happens when the lid has been closed for a few hours. What's causing this?

Hey there kevkear,
It sounds like you are seeing a line of black pixels on your screen after it has been asleep and closed for a bit. I would use the troubleshooting from the following article named:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
These steps in particular:
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
All the very best,
Sterling

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DaiP, welcome to the forum.
Here is the Display Quality issues section for the monitor. There are some issues that don't apply. Try the ones that do to see if they help.
Please click "KUDOS" if I have helped you and click "Accept as Solution" if your problem is solved.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
++++++++++++++++++
**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
I am not an HP employee.

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A line of pixels go black across screen?

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