LED Light guide plate and backlight unit using micro LED local dimming

摘要

The present invention relates to a light guide plate and a backlight unit using micro-LED local dimming. The backlight unit using micro-LED local dimming of the present invention comprises: a board having micro-LEDs disposed in a plane at predetermined intervals to allow a light source to be diffused upward; a reflective sheet positioned on an upper surface of the board, having a hole perforated in a section corresponding to the micro-LEDs to allow the light source to pass therethrough, and forming a remaining part except for the section corresponding to the micro-LEDs to block the light source; and a light guide plate positioned on an upper portion of the reflective sheet, refracting the light source by processing a first-shaped unevenness at a portion adjacent to the hole, and additionally diffusing the refracted light source by processing a second-shaped unevenness on an opposite surface thereof. According to the present invention, heat is generated as the brightness of the light source is brighter, such that a size of the light source is reduced by reversely using the same. Moreover, a side surface light source is applied as the entire light source of a bottom plate by minimizing an area of the light source, and the shade difference can be maximized to a partial area while reducing the area of the light source and the minimizing a loss of the brightness.