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3 A person at the default interface of Settings can scroll down and find the "Display & Lights". Mentioning "Device" makes everything looks like that the former is an option under which "Display & Lights" is located.
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I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes on. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Device → DisplayDisplay & lights  , you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes on. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Device → Display & lights, you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes on. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under SettingsDisplay & lights  , you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

2 corrected typo (in original post) and completed the menu option.
source | link

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes oneon. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Device → Display & lights, you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes one. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Display, you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes on. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Device → Display & lights, you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.

1
source | link

I once encountered similar behavior which was triggered by Ambient Display feature inside Settings. There is a guide on OnePlus Forums here (see Usage of Privacy Guard & Built in Settings (All Users)) which mentions this:

Ambient Display – this is again another option under the Display section of the Settings, when turned on (is ON by default) splashes notifications on the lock screen in black & white, every time you grab your phone off a table or something. This is a built in feature of Android Lollipop and is very useful. However, it is not that every time you grab the phone you wanna view notifications. You could be heading some where and want to keep the phone in your pocket or mounting the phone onto your car dashboard and the list goes one. So every time you do this, the ambient display comes and goes. While this may not eat up a whole lot of battery, turning this off will do something good.

Now that you know its under Settings → Display, you may try unchecking it and see if the issue ends. I had this issue when I flashed Lollipop and it ended right after unchecking it.