Display device and method to sense electrical characteristics of pixels
A display device includes: a display panel including a plurality of pixels and a display driver configured to receive input image data, and display an image The plurality of rows are divided into row groups, and each of the row groups includes at least one row among the plurality of rows. The display driver is configured to, in a blank period different from the display period, while selecting each of the plurality of rows, acquire sensing data associated with pixels of the selected row through the sensing lines, and apply an initialization data signal to the plurality of pixels of the plurality of rows through the data lines before the at least one row of each of the row groups is selected.
1 . A display device comprising:
a display panel including a plurality of pixels arranged along a plurality of rows, wherein the plurality of pixels are connected to data lines and sensing lines; and
a display driver configured to receive input image data, and display an image by providing image data signals to the plurality of pixels through the data lines, based on the received input image data,
wherein the plurality of rows are divided into row groups, and each of the row groups includes at least two rows among the plurality of rows, and
wherein the display driver is configured to:
while selecting each of the plurality of rows, acquire sensing data associated with pixels of the selected row through the sensing lines; and
apply an initialization data signal to the plurality of pixels of each row group through the data lines before selection of any row of the respective row group is selected.
2 . The display device of claim 1 , wherein the row groups include a first row group and a second row group,
wherein the first row group includes at least two first rows among the plurality of rows, and
the second row group includes at least two second rows among the plurality of rows, and
wherein the display driver is configured to apply the initialization data signal to the plurality of pixels of each of the first and second row groups through the data lines before any row of the respective row group is selected.
3 . The display device of claim 2 , wherein the display driver is configured to apply the initialization data signal to the plurality of of the second row group through the data lines before any row of the second row group is selected.
4 . The display device of claim 1 , wherein the initialization data signal is a black data voltage corresponding to a black grayscale.
5 . The display device of claim 1 , wherein the display driver includes a timing controller, a data driver, and a scan driver,
wherein each of the plurality of pixels includes:
a pixel circuit connected to one of the data lines and one of the sensing lines; and
a light emitting element connected between a first power source and a second power source, the light emitting element being connected to the first power source through the pixel circuit, and
wherein the pixel circuit includes a first transistor connected between the first power source and the light emitting element, a second transistor connected between one of the data lines and the first transistor, a first internal node connected between the first transistor and the second transistor, and a second internal node connected between the first transistor and the light emitting element.
6 . The display device of claim 5 , wherein, the image data signals are provided to the plurality of pixels during a display period, and the timing controller boosts the second power source during a blank period different from the display period.
7 . The display device of claim 5 , wherein the second transistor of each of the plurality pixels is turned on, wherein the initialization data signal is applied to the first internal node.
8 . The display device of claim 7 , wherein, when the initialization data signal is applied to the first internal node, an initialization voltage is applied to the second internal node.
9 . The display device of claim 8 , wherein a voltage of the initialization data signal is equal to or lower than the initialization voltage.
10 . A method of operating a display device including a plurality of pixels arranged along a plurality of rows, the method comprising:
dividing the plurality of rows into row groups, wherein each of the row groups includes at least two rows among the plurality of rows;
acquiring sensing data associated with pixels of a selected row among the rows through sensing lines in a blank period different from a display period, while selecting each of the plurality of pixels; and
applying an initialization data signal to the plurality of pixels of each row group through data lines before any row of the respective row group is selected.
11 . The method of claim 10 , wherein the row groups include a first row group and a second row group,
wherein the first row group includes at least two first rows among the plurality of rows, and
the second row group includes at least two second rows among the plurality of rows, and
wherein the applying of the initialization data signal to the plurality of pixels includes applying the initialization data signal to the plurality of pixels of the plurality of rows of the first row group through the data lines before before any row of the first row group is selected.
12 . The method of claim 11 , wherein the applying of the initialization data signal to the plurality of pixels includes applying the initialization data signal to the plurality of second row group through the data lines before any row of the second row group is selected.
13 . The method of claim 10 , wherein the initialization data signal is a black data voltage corresponding to a black grayscale.
14 . The method of claim 10 , wherein each of the plurality of pixels includes:
a pixel circuit connected to one of the data lines and one of the sensing lines; and
a light emitting element connected between a first power source and a second power source, the light emitting element being connected to the first power source through the pixel circuit, and
wherein the pixel circuit includes a first transistor connected between the first power source and the light emitting element, a second transistor connected between one of the data lines and the first transistor, a first internal node connected between the first transistor and the second transistor, and a second internal node connected between the first transistor and the light emitting element.
15 . The method of claim 14 , further comprising boosting the second power source in the blank period.
16 . The method of claim 14 , wherein the second transistor of each of the plurality pixels is turned on, wherein the initialization data signal is applied to the first internal node.
17 . A method of operating a display device including a plurality of pixels arranged along a plurality of rows, the method comprising:
dividing the plurality of rows into row groups, wherein each of the row groups includes at least two rows among the plurality of rows;
acquiring sensing data associated with pixels of a selected row among the rows through sensing lines in a blank period different from a display period, while selecting each of the plurality of pixels; and
applying an initialization data signal to a first internal node and applying an initialization voltage to a second internal node of the pixels of each row group through the data lines and the sensing lines, respectively, before any row of the respective row group is selected.
18 . The method of claim 17 , wherein a sensing control signal applies the initialization voltage to the pixels.