SUPER DIRECTIONAL LIGHT GUIDE FILM AND THIN FILM TYPE BACK LIGHT UNIT FOR FLAT PANEL DISPLAY USING THE SAME

摘要

Provided is a back light unit for a display device that has a light guide film. The light guide film includes, for example, a light entering part at a first side; a light reflecting part disposed at a second side; and a light guiding part between the light entering part and the light reflecting part, wherein the light entering part selectively sends an incident light of an expanded light provided from a light source that satisfies a total reflection condition toward the light guiding part, and wherein the light reflecting part converts the incident light provided from the light guiding part into a collimated light and sends it to the light guiding part.

主权项

1. A back light unit comprising:
a light guide film including a light entering part at a first side, a light reflecting part at a second side and a light guiding part between the light entering part and the light reflecting part; a light radiating part on an upper surface of the light guide film; and a light source adjacent to the light entering part of the light guide film, the light source providing an expanded light toward the light entering part, wherein the light entering part selectively sends an incident light of the expanded light that satisfies a total reflection condition toward the light guiding part, wherein the light reflecting part converts the incident light provided from the light guiding part into a collimated light and sends it to the light guiding part, and wherein the light radiating part provides a back light to the display panel as the collimated light propagates through the light guiding part.