I'm using an old Android phone as a web cam with the free app "IP Webcam" to read the display of my boiler. The software runs on an Raspberry Pi with debian, but any Linux version/architecture should work.
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Install Dependencies: Imagemagick sudo apt-get install imagemagick SSOCR wget http://www.unix-ag.uni-kl.de/~auerswal/ssocr/ssocr-2.16.0.tar.bz2 tar xvjf ssocr-2.16.0.tar.bz2 cd ssocr-2.16.0 apt-get -y install libimlib2 libimlib2-dev make sudo make install
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Read in doc/README-readLCD.txt on how to set cropping, rotation and such.