I'm having the exact same problem. The driver hasn't been updated for a while now.
Windows says it's this:
Driver Date: 16. March 2015
Driver Version: 10.18.14.4170
And when downloading the latest from ASUS' pages the installation_readme says the following:
Release Version: Production Version
Intel(R) Graphics Driver: 10.18.14.4170
Intel(R) Display Audio Driver: 220.127.116.1172
Microsoft Windows* 7 64
Microsoft Windows* 8.1 64
Release Date: March 20, 2015
So ASUS doesn't update the driver to the latest available. They do have their ASUS Live Update software installed, but as they don't update the driver, it won't find anything new naturally. I also installed Intel Driver Update Utility, but it only finds new drivers for Intel PROSet/Wireless Software and Drivers.
Next thing is to manually try a newer drivers and see if it helps.
I am unable to replicate this flickering issue.
I know an issue with flashing screen was reported and engineering is working on it, but seems to occur when adjusting screen brightness.
I would recommend wait for new drivers on our website Intel® Download Center