Display device and method for controlling peak luminance of the same

A method for controlling peak luminance of a display device, the method comprising:

• calculating contrast and load of an image of a frame based on R, G, and B image data input corresponding to the frame;
• determining a peak control coefficient for adaptively controlling peak luminance based on the contrast and the load;
• generating W image data based on a minimum value among grayscales of the R, G, and B image data;
• generating R′, G′, and B′ image data by subtracting a product of the W image data and the peak control coefficient from the R, G, and B image data, respectively;
• and
• generating a data signal based on the R′, G′, B′, and W image data.

A display device, comprising:

• an image analyzer configured to calculate contrast and load of an image of a frame based on R, G, and B image data input corresponding to the frame;
• an image processor configured to control a peak control coefficient applied to W image data to adaptively control peak luminance based on the contrast and the load, and to respectively convert the R, G, and B image data into R′, G′, B′, and W image data based on the peak control coefficient;
• an illuminance sensor configured to detect ambient light around the display panel;
• a first peak controller configured to determine a first sub peak control coefficient based on the ambient light and to provide the sub peak control coefficient to the image processor, the first sub peak control coefficient being additionally applied to the W image data;
• a temperature sensor configured to detect a temperature of the display panel;
• a second peak controller configured to determine a second sub peak control coefficient based on the temperature and to provide the sub peak control coefficient to the image processor, the second sub peak control coefficient being additionally applied to the W image data;
• a display panel including a plurality of pixels;
• a data driver configured to generate a data signal based on the R′, G′, B, and W image data, and to provide the data signal to the display panel;
• and
• a scan driver configured to provide a scan signal to the display panel.

A display device, comprising:

• an image analyzer configured to decide a frame image characteristic, wherein the frame image characteristic includes a peak image which requires an increase of the peak luminance and a normal image, and is decided according to contrast and load of a frame image which is generated based on R, G, and B image data input of a frame;
• an image processor configured to receive the contrast and the frame image characteristic from the image analyzer and generate R′, G′, B′, and W image data;
• a display panel including a plurality of pixels;
• a data driver configured to generate a data signal based on the R′, G′, B, and W image data, and to provide the data signal to the display panel;
• and
• a scan driver configured to provide a scan signal to the display panel,
• wherein the W image data W corresponds to a minimum value among the R image data R, G image data G, and B image data B,
• wherein the R′ G′, and B′ image data correspond to (R−W*PCC), (G−W*PCC), and (W*PCC), respectively, where PCC represents a peak control coefficient, and
• wherein PCC is 1 when the frame image characteristic is the normal image and PCC is equal to or greater than 0 and less than 1 when the frame image characteristic is the peak image, and
• wherein the PCC decreases as the contrast increases when the frame image characteristic is the peak image.