Patent ID: 7667170
Filing Date: 2010-02-23
Classification: G09G,H05B

Abstract:
1. A backlight unit, comprising: a light guide plate; a light source disposed at a side of the light guide plate; a sensor configured to sense brightness of natural light; an adaptive controller configured to generate a voltage level signal to compensate for a brightness difference between the brightness of the natural light and a reference brightness; and a light source driver configured to supply a voltage corresponding to the voltage level signal to the light source, wherein the light source supply an artificial light having a brightness corresponding to the voltage from the light source driver to the light guide plate, wherein the natural light is incident on a lower surface of the light guide plate; wherein the artificial light is incident on the side of the light guide plate; wherein the artificial light supplied from the light guide plate is mixed with the natural light to form a mixed light, wherein the mixed light is emitted from an upper surface of the light guide plate corresponding to a display panel, wherein brightness of the mixed light is equal to the reference brightness.