Display device for compensating for change in characteristic of pixels by horizontal line unit

A display device comprising:

• a display panel including a first display region and a second display region;
• and
• a driving controller configured to receive an image signal and a control signal, output an image data signal to be provided to the display panel, drive the first display region of the display panel at a first driving frequency in a multi-frequency mode, and drive the second display region at a second driving frequency lower than the first driving frequency, in the multi-frequency mode,
• wherein the display panel includes first horizontal lines corresponding to the first display region and second horizontal lines corresponding to the second display region, and
• wherein the driving controller is configured to:
• in the multi-frequency mode,
• count a first stress time of each of the first horizontal lines and calculate a first operating time of each of the first horizontal lines based on the first stress time and the first driving frequency,
• count a second stress time of each of the second horizontal lines and calculate a second operating time of each of the second horizontal lines based on the second stress time and the second driving frequency, and
• output the image data signal obtained by compensating for a stress for the image signal based on the image signal, the first operating time, and the second operating time,
• wherein the second operating time has a value of the second stress time divided by the second driving frequency, the second stress time is a number of the second horizontal lines in the multi-frequency mode and the second stress time is a total number of the first horizontal lines and the second horizontal lines in a single-frequency mode.

An electronic device comprising:

• a display panel including a first display region and a second display region;
• and
• a driving controller configured to receive an image signal and a control signal, output an image data signal to be provided to the display panel, drive the first display region of the display panel at a first driving frequency, and drive the second display region at a second driving frequency lower than the first driving frequency,
• wherein the display panel includes first horizontal lines corresponding to the first display region and second horizontal lines corresponding to the second display region,
• wherein the driving controller includes:
• a stress time calculating unit configured to count a first stress time of each of the first horizontal lines, and count a second stress time of each of the second horizontal lines;
• a memory configured to store previous stress data of a previous frame;
• and
• a compensating unit configured to calculate stress data of a present frame based on the image signal, the previous stress data, a first operating time, and a second operating time, and output the image data signal corresponding to the image signal based on the stress data, and
• wherein the stress data from the compensating unit is stored in the memory, as the previous stress data for a next frame,
• wherein the second operating time of each of the second horizontal lines has a value of the second stress time divided by the second driving frequency, and the second stress time is a number of the second horizontal lines or a total number of the first horizontal lines and the second horizontal lines.