Display device with image luminance adjustment
A display device includes a display panel and a display panel driver. The display panel includes pixels. The display panel driver determines an average image load of input image data, determines an operation mode based on a grayscale value of the input image data and the average image load as a first operation mode or a second operation mode, applies a first scale factor to the input image data in the first operation mode, applies a second scale factor different from the first scale factor to the input image data in the second operation mode, and drives the display panel.
1 . A display device comprising:
a display panel including a plurality of pixels; and
a display panel driver which:
determines a number of pixels which display a grayscale value of input image data less than or equal to a first reference grayscale value,
determines an average image load of the input image data;
determines a first scale factor and a second scale factor different from the first scale factor, based on the average image load and the number of pixels which display the grayscale value of the input image data less than or equal to the first reference grayscale value;
determines an operation mode based on the number of the pixels which display the grayscale value of the input image data less than or equal to the first reference grayscale value as a first operation mode associated with adjusting luminance of an input image corresponding to the input image data or a second operation mode associated with adjusting the luminance of the input image,
applies the first scale factor to the input image data in the first operation mode,
applies the second scale factor to the input image data in the second operation mode, and
drives the display panel.
2 . The display device of claim 1 , wherein the display panel driver operates as the first operation mode associated with adjusting the luminance of the input image when the number of pixels which display the grayscale value of the input image data less than or equal to the first reference grayscale value is greater than a first reference number.
3 . The display device of claim 2 , wherein the display panel driver:
generates a histogram for the grayscale value of the input image data; and
calculates the number of the pixels which display the grayscale value of the input image data less than or equal to the first reference grayscale value based on the histogram.