1. A method for improving printing quality, the method comprising: an application device transmitting an original image comprising a plurality of printing pixels to a driving device; the driving device setting the plurality of printing pixels as a plurality of first printing dots; the driving device detecting an edge of the original image; the driving device setting a plurality of second printing dots according to a plurality of neighboring pixels corresponding to the edge; and the driving device generating an image to be printed according to the plurality of first printing dots and the plurality of second printing dots.