Contrast enhancement device, and display device including the same

A contrast enhancement device included in a display device including a first display region and a second display region, the contrast enhancement device comprising:

• a first region analysis circuit which generates a contrast enhancement coefficient for the first display region of the display device by analyzing input data for the first display region;
• a second region analysis circuit which generates the contrast enhancement coefficient for the second display region of the display device by analyzing the input data for the second display region;
• a first channel process circuit which performs a contrast enhancement process on the input data transferred through a first channel based on the contrast enhancement coefficient for the first and second display regions;
• a second channel process circuit which performs the contrast enhancement process on the input data transferred through a second channel based on the contrast enhancement coefficient for the first and second display regions;
• a third channel process circuit which performs the contrast enhancement process on the input data transferred through a third channel based on the contrast enhancement coefficient for the first and second display regions;
• a fourth channel process circuit which performs the contrast enhancement process on the input data transferred through a fourth channel based on the contrast enhancement coefficient for the first and second display regions;
• and
• a diagnosis circuit which outputs output image data generated by the first through fourth channel process circuits in a normal mode, and generates diagnosis result data for the first and second region analysis circuits and the first through fourth channel process circuits by comparing output test data generated by the first through fourth channel process circuits in a diagnosis mode.

A display device comprising:

• a display panel including a plurality of pixels;
• a data driver which provides data signals to the plurality of pixels;
• a scan driver which provides scan signals to the plurality of pixels;
• and
• a controller which controls the data driver and the scan driver, wherein the controller comprises a contrast enhancement device,
• wherein the contrast enhancement device comprises:
• an analysis circuit which receives input image data as input data in a normal mode, receives input test data as the input data in a diagnosis mode, and determines a contrast enhancement coefficient by analyzing the input data;
• a process circuit which generates output data by performing a contrast enhancement process on the input data based on the contrast enhancement coefficient, wherein the output data in the normal mode is output image data corresponding to the input image data, and the output data in the diagnosis mode is output test data corresponding to the input test data;
• and
• a diagnosis circuit which outputs the output image data in the normal mode, and generates diagnosis result data for the contrast enhancement device by comparing the output test data with reference test data in the diagnosis mode.