A backlight assembly includes a light source for emitting light; and a light guiding plate for guiding the light emitted from the light source. The masks table contains filter information and a mask key. Each of the first detection patterns includes a plurality of first detection cells arranged in a single column and a plurality of first connection lines configured to connect first detection cells which are adjacent to each other. Moreover, the lopping apparatus includes a second blade member connected to the second handle, the second blade member having a second cutting portion.