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Nice project!

One tip for keeping the cost down - small LCD screens with composite inputs are available very cheaply on ebay (and elsewhere) if you search for rear view camera screens.

I got one for about half the price of similar units on adafruit. The viewing angle is terrible (as is the case on most really cheap screens) but the colour and brightness are great.

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Somewhat related: where can I buy laptop-sized (13 inches and up) LCD screens that I can connect to a Raspberry Pi? I looked at eBay a while ago, and all I found was replacement screens for laptops, which neither have connectors that work with the RPi or backlight.

Edit: Of course I could just buy an ordinary LCD desktop monitor, but those are big and bulky. I'd rather have something slim and compact like a laptop screen, but without the laptop...

Most of the bulk in desktop LCD monitors is the power supply. Either find one that has an external supply or just rip that part out and use your own.

Great idea. Aside from the viewing angle are there any other differences?

The viewing angle is terrible

That's annoying but could be useful to get the viewer to stand in an intended path or spot to participate in some reactive art.

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