Display device having a variable driving frequency
A display device includes a display panel that includes a plurality of pixels, a data driver configured to provide a data voltage to the plurality of pixels, a scan driver configured to provide a first scan signal and a second scan signal to the plurality of pixels, and a controller configured to control the data driver and the scan driver. The display panel is driven at a driving frequency that is variable within a driving frequency range. The scan driver provides the first scan signal to the plurality of pixels at the driving frequency, and provides the second scan signal to the plurality of pixels at a second driving frequency that is equal to or higher than the driving frequency.
1 . An electronic device comprising:
a processor configured to provide input image data having a variable input frame frequency; and
a display device,
wherein the display device comprises:
a display panel including a plurality of pixels;
a data driver configured to provide a data voltage to the plurality of pixels;
a scan driver configured to provide a first scan signal and a second scan signal to the plurality of pixels; and
a controller configured to control the data driver and the scan driver,
wherein the display panel is driven at a driving frequency that is variable within a driving frequency range,
wherein the scan driver provides the first scan signal and the second scan signal simultaneously to the plurality of pixels in a first period of a frame period, and provides only the second scan signal to the plurality of pixels in a second period of the frame period when the driving frequency of the display panel is lower than a maximum driving frequency,
wherein the controller is further configured to receive the input image data having the variable input frame frequency, and the driving frequency of the display panel is determined according to the variable input frame frequency,
wherein the first period of the frame period is an active period having a constant time length, and the second period of the frame period is a variable blank period having a variable time length, and
wherein the controller includes:
a first scan control signal generator configured to provide a first scan control signal to the scan driver in the active period;
a second scan control signal generator configured to generate an active scan control signal in the active period;
an input frequency detector configured to detect the variable input frame frequency;
a third scan control signal generator configured to generate a blank scan control signal in the variable blank period when the variable input frame frequency detected by the input frequency detector is lower than the maximum driving frequency; and
an OR gate configured to generate a second scan control signal by performing an OR operation on the active scan control signal and the blank scan control signal, and to provide the second scan control signal to the scan driver.
2 . The electronic device of claim 1 , wherein, when the driving frequency of the display panel is the maximum driving frequency, the scan driver provides the first scan signal and the second scan signal to the plurality of pixels in the active period, and the scan driver does not provide the first scan signal and the second scan signal to the plurality of pixels in the variable blank period, and
wherein, when the driving frequency of the display panel is lower than the maximum driving frequency, the scan driver provides the first scan signal and the second scan signal in the active period, and the scan driver provides only the second scan signal at least once to the plurality of pixels in the variable blank period.