Patent ID: 8817056

Claim:
A liquid crystal display (LCD) configured to be driven by a CPU interface method, comprising: a liquid crystal panel including a plurality of R, G, B, and W pixels (RGBW pixels) located between a plurality of scan lines and data lines, arranged in a matrix; a backlight unit for radiating light onto the liquid crystal panel; a data driver for applying data signals to the plurality of data lines; an image signal converter comprising a frame memory, the image signal converter for converting input RGB data into output RGBW data and providing the output RGBW data to the data driver; a dynamic backlight controller for controlling an amount of light emitted from the backlight unit to correspond to data applied to the RGBW pixels; and an input gamma processing unit for processing linear data input to gamma shaped non-linear data; a gamma mapping unit for extracting a white value from gamma shaped non-linear RGB data to convert the gamma shaped non-linear RGB data into gamma mapped RGBW data; an initial scaler for executing an initial scale value to be fixed as a specific scale value; a sub pixel rendering unit for matching the input RGB data with the output RGBW data to assign converted data values to corresponding RGBW pixels; an output gamma processing unit for performing an inverse gamma calculation with respect to gamma shaped non-linear RGBW data to output inverse gamma RGBW data; the frame memory for storing the inverse gamma RGBW data received from the output gamma processing unit, as frame data; and a real scaler for performing scaling in accordance with a real scale value corresponding to the frame data, wherein an amount of memory in the frame memory used to buffer frame data for a whole display of the LCD, is less than an amount of memory required to store all of the frame data for the whole display of the LCD.