Hide passcode lock when using projector

Is it possible to hide the passcode lock when using a projector? I'm a teacher so when my ipad locks and I want to unlock it the whole class can see my passcode unless I unplug it first!
Thanks

Many projectors have a button or option to 'black' the screen, which keeps the projector on, just in some way doesn't show any light, making it easy to show something else on the same screen. See if yours has the option, and if so, press it, put your code in, then press it again.

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