I've seen sets of screens like this at most train stations and I didn't realize until recently what they are for. These screens display areas further down the boarding platform. The man at the end of the train as described in this post checks these screens and ensures that everyone has boarded before he closes the doors.
I would also like to make a correction related to the above-mentioned post. Previously I suggested that the front and rear of the trains were identical, this is not usually true. I've seen some special trains where this is the case, but for most trains like the one pictured in the post, the front actually has considerably more controls.
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