Reflective polarizing module having diffusion pattern and backlight unit including same

A back light unit comprising:

• a light guide plate having a light source at one side thereof and transmitting light generated from the light source downwardly;
• a reflector which is stacked on a lower surface of the light guide plate and reflects light transmitted through the light guide plate upwardly;
• an optical module comprising a diffusion sheet stacked on an upper portion of the light guide plate to diffuse light transmitted from below and a first light-condensing sheet having a first structuralized pattern which is coupled to an upper portion of the diffusion sheet, and in which first unit light-condensing bodies are continuously repeated, wherein each of the first unit light-condensing bodies has an upwardly gradually decreasing transverse cross-sectional area;
• and
• a reflective polarizing module comprising a reflective polarizing sheet having a plurality of layers with different refractive indices stacked one above another to selectively transmit light, a second light-condensing sheet having a second structuralized pattern in which second unit light-condensing bodies are continuously repeated, wherein each of the second unit light-condensing bodies has an upwardly gradually decreasing transverse cross-sectional area, and an upper end of each of the second unit light-condensing bodies is bonded to a lower portion of the reflective polarizing sheet so as to have a first width along a traverse direction, and a coating layer located on an upper surface of the reflective polarizing sheet and having a diffusion pattern formed on an upper surface thereof to diffuse light transmitted through the reflective polarizing sheet, the diffusion pattern having a plurality of diffusion protrusions protruding from the upper surface of the coating layer,
• wherein at least two of the plurality of diffusion protrusions are formed to have a transverse width relatively smaller than the first width.