Display device and method of driving the same using refresh-rate-dependent enable scan signal width
A display device includes at least one pixel configured to receive a voltage of an initialization power source, which is supplied to an anode electrode of a light emitting element, when an enable scan signal is supplied to a scan line, and a scan driver. The scan driver is configured to supply the enable scan signal to the scan line. The enable scan signal supplied to the scan line by the scan driver has a same width during an active area of a frame regardless of an image refresh rate, and the width of the enable scan signal supplied to the scan line is changed by the scan driver during a blank area of the frame, corresponding to the image refresh rate.
1 . A display device, comprising:
at least one pixel configured to receive a voltage of an initialization power source, which is supplied to an anode electrode of a light emitting element, during a width of an enable scan signal supplied to a scan line; and
a scan driver configured to supply the enable scan signal to the scan line,
wherein the enable scan signal supplied to the scan line by the scan driver has a same width during an active area of a single frame regardless of an image refresh rate,
the width of the enable scan signal supplied to the scan line is changed by the scan driver during a blank area of the single frame, corresponding to the image refresh rate,
the display device is driven at a first image refresh rate and a second image refresh rate,
when the display device is driven at the second image refresh rate, the blank area of the single frame includes a first period and a second period, the enable scan signal has a first width during the first period, and the enable scan signal has the first width and subsequently has a second width, different from the first width, during the second period, and
the first width and the second width are successively applied within the blank area of the single frame,
wherein the at least one pixel includes a driving transistor configured to control an amount of current supplied to the light emitting element, the driving transistor including a first electrode, a second electrode and a gate electrode, and
wherein during the blank area, a bias voltage is supplied to the first electrode of the driving transistor when the enable scan signal has the first width and when the enable scan signal has the second width.
2 . The display device of claim 1 , wherein the enable scan signal supplied by the scan driver has the first width in the blank area of the single frame when the display device is driven at the first image refresh rate, and the enable scan signal supplied by the scan driver has the first width and the second width in the blank area of the single frame when the display device is driven at the second image refresh rate,
wherein the second image refresh rate is lower than the first image refresh rate.
3 . The display device of claim 2 , wherein the first image refresh rate is a driving frequency of about 10 Hz or higher, and the second image refresh rate is a driving frequency of about 1 Hz.
4 . The display device of claim 2 , wherein the scan driver supplies the enable scan signal having the first width during the first period, and supplies the enable scan signal having the second width during the second period.
5 . The display device of claim 4 , wherein the first period is a period having a same time as the blank area of the first image refresh rate, and the second period is a period after the first period.
6 . The display device of claim 4 , wherein the enable scan signal supplied by the scan driver has the first width and subsequently has the second width during the second period.
7 . The display device of claim 1 , wherein:
the enable scan signal supplied by the scan driver has the first width in the blank area of the single frame when the display device is driven at the first image refresh rate;
the enable scan signal supplied by the scan driver has the first width and the second width in the blank area of the single frame when the display device is driven at the second image refresh rate, which is lower than the first image refresh rate; and
the enable scan signal supplied by the scan driver has the first width, the second width, and a third width in the blank area of the single frame when the display device is driven at a third image refresh rate lower than the second image refresh rate.
8 . The display device of claim 7 , wherein the first width, the second width, and the third width are different widths.
9 . The display device of claim 7 , wherein the scan driver supplies the enable scan signal having the first width during the first period, and supplies the enable scan signal having the second width during the second period.
10 . The display device of claim 9 , wherein the first period is a period having a same time as the blank area of the first image refresh rate, and the second period is a period after the first period.
11 . The display device of claim 7 , wherein the blank area of the third image refresh rate includes a first period, a second period, and a third period, and
wherein the scan driver supplies the enable scan signal having the first width during the first period, supplies the enable scan signal having the second width during the second period, and supplies the enable scan signal having the third width during the third period.
12 . The display device of claim 11 , wherein the first period and the second period correspond to a period having a same time as the blank area of the second image refresh rate, and the third period is a period after the second period.
13 . The display device of claim 1 , further comprising:
a timing controller configured to control the scan driver,
wherein the timing controller includes:
an oscillator configured to generate a clock signal;
a frequency determiner configured to determine the image refresh rate, and determine a length of the blank area included in the image refresh rate, using the clock signal; and
a start signal supplier configured to supply a start signal to the scan driver, corresponding to the image refresh rate and the length of the blank area, which are supplied from the frequency determiner.
14 . The display device of claim 13 , wherein the start signal supplier supplies the start signal such that the width of the enable scan signal is changed corresponding to the blank area.
15 . A method of driving a display device including pixels each comprising a driving transistor configured to control an amount of current supplied to a light emitting element, the driving transistor including a first electrode, a second electrode and a gate electrode, the method comprising:
supplying an enable scan signal having a first width during a blank area when the display device is driven at a first image refresh rate; and
supplying the enable scan signal having the first width and having a second width during the blank area when the display device is driven at a second image refresh rate lower than the first image refresh rate,
during the blank area, supplying a bias voltage to the first electrode of the driving transistor when the enable scan signal has the first width and when the enable scan signal has the second width,
wherein the first width is different from the second width,
when the display device is driven at the second image refresh rate, the blank area includes a first period and a second period, the enable scan signal has the first width during the first period, and the enable scan signal has the first width and subsequently has the second width during the second period,
wherein the first width and the second width are successively applied within the blank area of a single frame.
16 . The method of claim 15 , wherein the first image refresh rate is a driving frequency of about 10 Hz or higher, and the second image refresh rate is a driving frequency of about 1 Hz.
17 . The method of claim 15 , wherein the first period is a period having a same time as the blank area of the first image refresh rate, and the second period is a period after the first period.
18 . An electronic device, comprising:
a display panel comprising at least one pixel configured to receive a voltage of an initialization power source, which is supplied to an anode electrode of a light emitting element, during a width of an enable scan signal supplied to a scan line; and
a scan driver configured to supply the enable scan signal to the scan line,
wherein the enable scan signal supplied to the scan line by the scan driver has a same width during an active area of a single frame regardless of an image refresh rate,
the width of the enable scan signal supplied to the scan line is changed by the scan driver during a blank area of the single frame, corresponding to the image refresh rate,
the display panel is driven at a first image refresh rate and a second image refresh rate,
when the display panel is driven at the second image refresh rate, the blank area of the single frame includes a first period and a second period, the enable scan signal has a first width during the first period, and the enable scan signal has the first width and subsequently has a second width, different from the first width, during the second period, and
the first width and the second width are successively applied within the blank area of the single frame,
wherein the at least one pixel includes a driving transistor configured to control an amount of current supplied to the light emitting element, the driving transistor including a first electrode, a second electrode and a gate electrode, and
wherein during the blank area, a bias voltage is supplied to the first electrode of the driving transistor when the enable scan signal has the first width and when the enable scan signal has the second width.