Patent ID: 8179391

Claim:
A mobile display device driving apparatus that can reduce power consumption, comprising: a liquid crystal panel including a plurality of liquid crystal cells each formed in sub-pixel areas of four colors; a battery coupled with the mobile display device and charged with a voltage; a power saving mode signal generator coupled with the battery and operable to detect a remaining power of the battery and to generate a power saving mode signal based on the detected power to set a power saving mode of the liquid crystal panel; a controller operable to: set a gain value in response to the power saving mode signal; to convert external three-color input data into four-color data based on the set gain value; and to generate a dimming signal based on the power saving mode signal; a panel driver coupled with the liquid crystal panel and operable to display an image corresponding to the four-color data on the liquid crystal panel; an inverter coupled with the controller and operable to generate a lamp drive voltage in response to the dimming signal; and a backlight unit coupled with the inverter and operable to generate a light signal in response to the lamp drive voltage and to irradiate the generated light to the liquid crystal panel; wherein the power saving mode signal generator comprises: a battery power detector operable to generate a detect signal based on the remaining power of the battery; a comparator operable to generate the power saving mode signal based on the detect signal, the power saving mode signal assuming a high state when the detect signal is higher than or equal to a reference signal and a low state when the detect signal is lower than the reference signal; wherein the controller comprises: a driver control signal generator operable to generate control signals that control the panel driver using external input synchronous signals; a data converter operable to set the gain value based on the power saving mode signal and to convert the external three-color input data into the four-color data based on the set gain value; a dimming signal generator that generates the dimming signal using white data of the four-color data and the power saving mode signal.