Probably because the signal going into the projector is a different resolution to the panel. The projector has an auto sync feature. But that only helps so far. Try changing the laptop resolution to match the native resolution of the projector (the pixels) and not the maximum resolution.
SOURCE: Thin vertical line appears on projector
I have found that vertical lines that suddenly appear from projectors are due to poorly connected cables. Sut off your projector and wait for the fan to go off. Then unplug the connectors from the computer to the projector and secure them again, making sure to go all the way. Hope this helps.
SOURCE: What causes white vertical lines on dlp projector?
Possible fault on the mother board as there are noise on the LCD display. You might need help to sort this out if the fault does not clear even after the lamp works for some times.
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