Abstract: A semiconductor integrated circuit, includes: a light emitting diode driver for driving a light emitting diode which is a backlight source of a liquid crystal display panel; a regulator that stabilizes an externally supplied power supply voltage, so as to supply a power supply voltage which is stabilized to a liquid crystal driver that drives the liquid crystal panel; a level shifter which shifts a level of image data supplied to a data input terminal, so as to supply, to the liquid crystal driver, image data that has a level corresponding to the power supply voltage stabilized by the regulator; and a control circuit which switches on/off an operation of at least one of the light emitting diode driver and the regulator, in accordance with a command supplied to the data input terminal; wherein the semiconductor integrated circuit is used, being coupled to the liquid crystal display panel and to the liquid crystal driver.