I recommend you to reinstall the display drivers of your laptop as the issue may occur due to the corrupted display drivers.
Uninstall the display drivers from Device Manager.
Expand Display devices.
Right click on the display device and select Uninstall.
On restarting the laptop, windows will detect the device and reinstall the display drivers.
You can even install the display drivers from your notebook support website:
www.csd.toshiba.com
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