Display device and electronic device
A display device includes a plurality of pixels and a plurality of dummy pixels, a data driver connected to the plurality of pixels and the plurality of dummy pixels through data lines, a sensing circuit connected to the plurality of pixels and the plurality of dummy pixels through sensing lines, a scan driver configured to sequentially apply a scan signal and a first sensing signal to the plurality of pixels and the plurality of dummy pixels on a row-by-row basis in an active period of a frame period, to apply the scan signal and the first sensing signal to the plurality of pixels in a selected pixel row in a first period within a blank period of the frame period, and to apply a second sensing signal to the plurality of dummy pixels in a second period after the first period within the blank period.
1 . A display device comprising:
a display panel including a plurality of data lines and a plurality of sensing lines, including a plurality of pixels in a display region, and further including a plurality of dummy pixels in a peripheral region adjacent to the display region;
a data driver connected to the plurality of pixels and the plurality of dummy pixels through the plurality of data lines;
a sensing circuit connected to the plurality of pixels and the plurality of dummy pixels through the plurality of sensing lines; and
a scan driver configured to sequentially apply a scan signal and a first sensing signal to the plurality of pixels and the plurality of dummy pixels on a row-by-row basis in an active period of a frame period, to apply the scan signal and the first sensing signal to the plurality of pixels in a selected pixel row among the pixels in a first period within a blank period of the frame period, and to apply a second sensing signal to the plurality of dummy pixels in a second period after the first period within the blank period,
wherein the application of the second sensing signal causes a voltage level of an initialization voltage at a time of a falling edge of the first sensing signal applied to the plurality of pixels in the selected pixel row in the first period to be substantially equal to a voltage level of the initialization voltage at a time of a falling edge of the first sensing signal applied to the plurality of pixels in the selected pixel row in the active period.
2 . The display device of claim 1 , wherein, in the first period, the initialization voltage is applied to source nodes of the plurality of pixels in the selected pixel row through the plurality of sensing lines, and
wherein, in the second period, the initialization voltage is applied to source nodes of the plurality of dummy pixels through the plurality of sensing lines.
3 . The display device of claim 1 , wherein a falling edge of the first sensing signal applied to the plurality of pixels in the selected pixel row in the first period lags behind a rising edge of the second sensing signal applied to the plurality of dummy pixels in the second period.
4 . The display device of claim 1 , wherein data voltages applied to the plurality of dummy pixels in the active period of the frame period are data voltages applied to the plurality of pixels in a pixel row subsequent to the selected pixel row in an active period of a previous frame period.
5 . The display device of claim 1 , wherein data voltages applied to the plurality of dummy pixels in the active period of the frame period correspond to a fixed gray level.
6 . The display device of claim 1 , wherein the plurality of pixels are arranged in first through N-th pixel rows, where N is an integer greater than or equal to 2, and
wherein the plurality of dummy pixels are arranged in an (N+1)-th pixel row.
7 . The display device of claim 6 , wherein the selected pixel row is randomly selected from the first through N-th pixel rows in each frame period.
8 . The display device of claim 1 , wherein the peripheral region is a black matrix region surrounding the display region.
9 . The display device of claim 1 , wherein the display panel is driven at a variable frame frequency, and
wherein a time length of the blank period is changed according to the variable frame frequency.
10 . The display device of claim 1 , wherein each of the plurality of pixels and the plurality of dummy pixels comprises:
a driving transistor including a gate connected to a gate node, a first terminal which receives a first power supply voltage, and a second terminal connected to a source node;
a scan transistor configured to connect a corresponding data line among the plurality of data lines to the gate node in response to the scan signal;
a sensing transistor configured to connect a corresponding sensing line among the plurality of sensing lines to the source node in response to the first sensing signal;
a storage capacitor connected between the gate node and the source node; and
a light-emitting element including an anode connected to the source node, and a cathode which receives a second power supply voltage, and
wherein each of the plurality of dummy pixels further includes:
an initialization transistor configured to connect the corresponding sensing line to the source node in response to the second sensing signal.
11 . The display device of claim 10 , wherein the scan transistor includes a gate which receives the scan signal, a first terminal connected to the corresponding data line, and a second terminal connected to the gate node,
wherein the sensing transistor includes a gate which receives the first sensing signal, a first terminal connected to the corresponding sensing line, and a second terminal connected to the source node, and
wherein the initialization transistor includes a gate which receives the second sensing signal, a first terminal connected to the corresponding sensing line, and a second terminal connected to the source node.
12 . The display device of claim 10 , wherein the sensing transistor of each of the plurality of pixels in the selected pixel row applies an initialization voltage to the source node of each of the plurality of pixels in the selected pixel row in the first period, and
wherein the initialization transistor of each of the plurality of dummy pixels applies the initialization voltage to the source node of each of the plurality of dummy pixels in the second period.
13 . The display device of claim 10 , wherein the blank period comprises:
an initialization period in which a sensing data voltage is applied to the gate node of each of the plurality of pixels in the selected pixel row and the initialization voltage is applied to the source node of each of the plurality of pixels in the selected pixel row;
a sensing period in which a sensing operation is performed on the plurality of pixels in the selected pixel row;
a rewrite period in which a previous data voltage is applied to the gate node of each of the plurality of pixels in the selected pixel row and the initialization voltage is applied to the source node of each of the plurality of pixels in the selected pixel row; and
a dummy initialization period in which the initialization voltage is applied to the source node of each of the plurality of dummy pixels, and
wherein the first period is the rewrite period, and the second period is the dummy initialization period.
14 . The display device of claim 13 , wherein the previous data voltage is substantially equal to a data voltage applied to each of the plurality of pixels in the selected pixel row in the active period.
15 . The display device of claim 13 , wherein the sensing circuit comprises:
a sensing channel configured to perform the sensing operation;
an initialization switch configured to apply the initialization voltage to the sensing line in response to an initialization switching signal; and
a sampling switch configured to connect the sensing line to the sensing channel in response to a sampling switching signal.
16 . A display device comprising:
a display panel including a plurality of data lines and a plurality of sensing lines, including a plurality of pixels in a display region, and further including a plurality of dummy pixels in a peripheral region adjacent to the display region;
a data driver connected to the plurality of pixels and the plurality of dummy pixels through the plurality of data lines;
a sensing circuit connected to the plurality of pixels and the plurality of dummy pixels through the plurality of sensing lines; and
a scan driver configured to apply a scan signal and a first sensing signal to the plurality of pixels and the plurality of dummy pixels, and to further apply a second sensing signal to the plurality of dummy pixels,
wherein each of the plurality of pixels and the plurality of dummy pixels comprises:
a driving transistor including a gate connected to a gate node, a first terminal which receives a first power supply voltage, and a second terminal connected to a source node;
a light-emitting element including an anode connected to the source node, and a cathode which receives a second power supply voltage, and
wherein each of the plurality of dummy pixels further comprises:
an initialization transistor configured to connect a corresponding one of the sensing lines to the source node in response to the second sensing signal.
17 . The display device of claim 16 , wherein the scan driver sequentially applies the scan signal and the first sensing signal to the plurality of pixels and the plurality of dummy pixels on a row-by-row basis in an active period of a frame period, applies the scan signal and the first sensing signal to the plurality of pixels in a selected pixel row in a first period within a blank period of the frame period, and applies the second sensing signal to the plurality of dummy pixels in a second period after the first period within the blank period.
18 . An electronic device comprising:
a processor;
a memory connected to the processor;
a power module connected to the processor; and
a display device configured to receive input image data from the processor, and to display an image based on the input image data, the display device comprising:
a display panel including a plurality of data lines and a plurality of sensing lines, including a plurality of pixels in a display region, and further including a plurality of dummy pixels in a peripheral region adjacent to the display region;
a data driver connected to the plurality of pixels and the plurality of dummy pixels through the plurality of data lines;
a sensing circuit connected to the plurality of pixels and the plurality of dummy pixels through the plurality of sensing lines; and
a scan driver configured to sequentially apply a scan signal and a first sensing signal to the plurality of pixels and the plurality of dummy pixels on a row-by-row basis in an active period of a frame period, to apply the scan signal and the first sensing signal to the plurality of pixels in a selected pixel row in a first period within a blank period of the frame period, and to apply a second sensing signal to the plurality of dummy pixels in a second period after the first period within the blank period,
wherein data voltages applied to the plurality of dummy pixels in the active period of the frame period are data voltages applied to the plurality of pixels in a pixel row subsequent to the selected pixel row in an active period of a previous frame period.
19 . The electronic device of claim 18 , wherein each of the plurality of pixels and the plurality of dummy pixels comprises:
a driving transistor including a gate connected to a gate node, a first terminal which receives a first power supply voltage, and a second terminal connected to a source node; and
a light-emitting element including an anode connected to the source node, and a cathode which receives a second power supply voltage, and
wherein each of the plurality of dummy pixels further comprises:
an initialization transistor configured to connect a corresponding one of sensing lines to the source node in response to the second sensing signal.