Read the statement by Michael Teeuw here.
What Monitor did you use?
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 I got this one for 200 euro in MediaMarkt: http://tweakers.net/pricewatch/435115/lg-27mp37vq-b-zwart.html It’s very thin - especially without the bezel (I think it’s 13mm at its thickest) and the control board is completely detachable and only slightly bigger than the Raspberry Pi. It was a very easy install. Only downside is that the HDMI cable comes straight out - the back they all seem to these days. I solved this with a 90 degree HDMI cable. 
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 I can advise to use use ViewSonic! 
 e.g.:
 https://www.amazon.de/gp/product/B00K6E8ACU/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
 I used now two of them for both: it’s not too difficult to get rid of the bezel, they are very slim, and all connectors showing downbr! 
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 I also used a ViewSonic, this 24 inch: 
 https://www.amazon.com/Viewsonic-VA2446M-LED-24-Inch-1080p-Monitor/dp/B00D601UC8
 Like Eric said, the bezel came off fairly easily and it’s slim. Plus it’s only $129.99 right now!
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 I used an Asus MB169B+ which is an external USB C monitor. It’s extremely thin, but I had to get a controller on eBay, since the included controller has only the USB-port (and uses DisplayLink). 
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 @sero That’s a sexy monitor! :) 
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 Would the iiyama ProLite X2483HSU-B2 be a good kandidate? Together with a 70% reflective 30% pass-through mirror? 
 Or are there better options on the market for a setup like this mirror (24 inch, with usb to power the pi).En voor de Nederlands sprekenden: hoe heet zo’n spiegel in het Nederlands (two-way mirror) 
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 @neuzehie They, unfortunately, go by a lot of names: Confrontatiespiegel, observatieglas/spiegel, halfdoorlatende spiegel… 
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 Maybe not the best solution for you but well. I bought a cheap 17 inch Laptop screen from ebay LTN170X2-L02 17inch (1€ +6€ shipment) and then i bought a controller from ebay as well TV T.VST59 (21€ suggested price). Just search for nearly ending auctions with no bids on it, but first look if there is a working controller. Its pretty easy to set up everything is plug and play. 
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 I use a old Asus laptop X53 screen witch I unmounted (read: Destroyd) from the bezel and added direcly on the glas. Then I added a custom LCD Controller from amazon. Not the best light (bleeds abit) but smal and works great! 
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 I live in the US but this is what I used… http://www.newegg.com/Product/Product.aspx?Item=N82E16824009627 



