A display control method of a device including a pentile Red-Green-Blue-White, RGBW, type display panel and a lighting system providing light to the display panel, the method comprising: determining a display mode; detecting input of an RGBW data frame; applying a weight corresponding to the determined display mode to at least a White, W, sub-pixel value among pixel values of the RGBW data frame; determining luminance control data using the pixel values to which the weight is applied; controlling the lighting system to output light based on the determined luminance control data; and controlling the display panel to transmit the light based on the determined luminance control data; wherein the display mode is determined based on one or more of: an external illumination; an attribute of the RGBW data frame; and a selection of a display mode from a mode setting screen; wherein the method further comprises creating a histogram using the pixel values to which the weight is applied, wherein the creating of the histogram comprises creating a first sub-histogram using saturated pixel values among the pixel values to which the weight is applied, and creating a second sub-histogram using non-saturated pixel values among the pixel values to which the weight is applied, wherein in the first sub-histogram, a first axis corresponds to a grade, j=0,1,2,..., m, associated with a pixel value, and a second axis corresponds to an accumulated amount of a j-th grade, and wherein in the second sub-histogram, a first axis corresponds to a grade, k=0,1,2,..., 1, associated with a pixel value, and a second axis corresponds to an accumulated amount of an k-th grade; wherein when sub pixel values are the same, the corresponding pixel value is non-saturated, and when a difference between at least two sub pixel values is a certain value or greater, the corresponding pixel value is saturated; wherein a range of pixel values is divided into sub-ranges and a grade is assigned to each sub-range; wherein the luminance control data is determined using the histogram. determining a display mode; detecting input of an RGBW data frame; applying a weight corresponding to the determined display mode to at least a White, W, sub-pixel value among pixel values of the RGBW data frame; determining luminance control data using the pixel values to which the weight is applied; controlling the lighting system to output light based on the determined luminance control data; and controlling the display panel to transmit the light based on the determined luminance control data; wherein the display mode is determined based on one or more of: an external illumination; an attribute of the RGBW data frame; and a selection of a display mode from a mode setting screen; wherein the method further comprises creating a histogram using the pixel values to which the weight is applied, wherein the creating of the histogram comprises creating a first sub-histogram using saturated pixel values among the pixel values to which the weight is applied, and creating a second sub-histogram using non-saturated pixel values among the pixel values to which the weight is applied, wherein in the first sub-histogram, a first axis corresponds to a grade, j=0,1,2,..., m, associated with a pixel value, and a second axis corresponds to an accumulated amount of a j-th grade, and wherein in the second sub-histogram, a first axis corresponds to a grade, k=0,1,2,..., 1, associated with a pixel value, and a second axis corresponds to an accumulated amount of an k-th grade; wherein when sub pixel values are the same, the corresponding pixel value is non-saturated, and when a difference between at least two sub pixel values is a certain value or greater, the corresponding pixel value is saturated; wherein a range of pixel values is divided into sub-ranges and a grade is assigned to each sub-range; wherein the luminance control data is determined using the histogram.