Backlight unit and display apparatus having the same

A display apparatus comprising:

• a display panel receiving light and displaying an image;
• a light source emitting the light;
• and
• a light guide plate receiving the light and guiding the light to the display panel, the light guide plate comprising:
• a body comprising a first side surface disposed adjacent to the light source, a second side surface facing the first side surface, and an upper surface;
• and
• protruding portions protruded from the upper surface, wherein each of the protruding portions comprises first and second protruding portions sequentially arranged from the first side surface to the second side surface, a width of the first protruding portion in a direction substantially parallel to the first side surface becomes smaller as a distance from the first side surface becomes larger, and a width of the second protruding portion in the direction substantially parallel to the first side surface becomes larger as the distance from the first side surface becomes larger.