Scan Lines (Diagonal)
Ok, Make a new canvas 3x3 with a transparent background, Get out your pencil tool, (Make sure the colour is set to black) Zoom in to about 1700% Then draw 3 dots in diagonal, (Doesnt matter what direction, But the direction determines what way your scan lines will go). Then once done go to Edit>Define pattern. And call it Diagonal Scan Lines.
Ok Hope this tutorial helped!