Patent ID: 8363301

Claim:
A transparent smart light source capable of adjusting an illumination direction, comprising: a transparent organic light-emitting diode (OLED) for bidirectional emission of light, the bidirectional emission including top emission and bottom emission; and a reflectance/transmittance tunable device having reflectance/transmittance varying according to a polarity and level of an applied voltage, and reflecting or transmitting the light emitted from the transparent OLED to adjust the illumination direction, wherein the reflectance/transmittance of the reflectance/transmittance tunable device varies according to the polarity and level of the applied voltage to place the reflectance/transmittance tunable device in a transparent state, a non-transparent state, or a reflective state, and wherein when voltages of (+) polarity and (−) polarity having a lower level than a predetermined threshold value are applied to the reflectance/transmittance tunable device, the reflectance/transmittance tunable device is placed in the non-transparent state so as to have a predetermined reflectance and transmittance.