Driving apparatus of light emitting diode and liquid crystal display using the same

摘要

The device has a set of light emitting diode groups (G10-G30) in which light emitting diode diodes (D11-D13) are connected in series between the groups. A set of constant voltage supplying units (100-300) delivers a constant voltage required for controlling constant current toward each one of the light emitting diode groups and outputs the constant voltage in which the output voltage is equal to or lower than an input voltage. A pulse modulation signal supplying unit (400) delivers pulse modulation signals in a specified duration (PWM110) to each of the voltage supplying units.