AC-direct drive-type LED driving device

An LED driving device comprising:

• a power supply unit for rectifying AC power and supplying the rectified power;
• an LED unit for emitting light using the power supplied thereto from the power supply unit, the LED unit including a first LED group and a second LED group, each LED group including one or more LEDs connected in series with each other;
• a power measurement unit for measuring the magnitude of the power supplied from the power supply unit to the LED unit;
• and
• a light emission control unit for controlling the light-emitting order of the LEDs of the LED unit so that the LEDs of the second LED group emit light sequentially in reverse order or the first LED group and the second LED group emit light sequentially in order based on the measured magnitude of the power,
• wherein the first LED group and the second LED group are connected in series with each other,
• wherein the light emission control unit controls the LEDs of the second LED group to emit light sequentially in reverse order, by starting from the last LED of the second LED group if the measured magnitude of the power is smaller than or equal to a first threshold magnitude, and controls the LEDs of the first LED group and the second LED group to emit light sequentially in order, by starting from the first LED of the first LED group if the measured magnitude of the power is larger than or equal to the first threshold magnitude.