Hello,
I like to take apart printers, especially to get the parts inside, and it feels like a waste to get rid of the displays. I was taking apart an Epson XP-820, and the display was too good to get rid of. I think that it's a 4.3-inch TFT display, and counted 45 pins on the display, and it also came with a driver-looking device, that had a 24-pin input. There was also a very interesting clear thing with 4 pins that also plugs into the driver and I think that it is a panel overlay (a touchscreen that goes over a normal screen. The display is 105.5 mm x 67.2 mm x 2.8 mm. The panel overlay is 188.5 mm x 67.2 x 14 mm. It would be really nice if someone could help me find a way to interface these with Arduino or Raspberry Pi, or both at the same time.
That's a touchscreen panel.
It's usually quiet difficult to repurpose these sorts of displays. They have custom controller boards and little if any documentation available to the 'man on the street' as it were.
If you have a working printer, then you may be able to attach a logic analyser to the connector that connects the display board to the rest of the printer and try and discover the signals used.
If you can locate a service manual for the printer, then you may get lucky if it identifies the signals going to the display board.
If you were hoping for a simple solution to repurpose this type of display, the I think you may be disappointed.
Couldn't I just hook up a multimeter, find which pins are connected, and then use a board with a 3.3v operating voltage to map it out? Sparkfun has a datasheet on another one. https://www.sparkfun.com/datasheets/LCD/HOW%20DOES%20IT%20WORK.pdf?scrlybrkr=754456c5
A quick search for "Arduino touchscreen" generated lots of possibilities. I would think that interfacing to the touchscreen would be fairly straightforward compared to interfacing with the actual display.
Ok. Thanks! Do you think I could hook up the driver to Arduino or Raspberry Pi, even with 24 pins?
Instructables: https://www.instructables.com/4-wire-Touchscreen-Interfacing-With-Arduino/
Are you trying to use just the 4-wire touchscreen or the complete display & touchscreen assembly?
Both
See post #2.
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