Display device and a method of driving the display device
A display device including: a display panel which includes a plurality of pixels arranged in first to n th pixel rows, wherein n is a natural number greater than 1; and a panel driver which drives the display panel in response to input image data, and generates sensing data by sensing the plurality of pixels, wherein the panel driver randomly senses one of the first to n th pixel rows in each of a plurality of sensing frame periods when the input image data correspond to a low grayscale image, wherein the sensing frame periods are repeated and consecutive non-sensing frame periods are provided between the sensing frame periods.
1 . A display device, comprising:
a display panel which includes a plurality of pixels arranged in first to n th pixel rows, wherein n is a natural number greater than 1; and
a panel driver which drives the display panel in response to input image data during frame periods, and generates sensing data by sensing the plurality of pixels, each frame period comprises an active period and a vertical blank period,
wherein the panel driver randomly senses one of the first to n th pixel rows in each of a plurality of sensing frame periods when the input image data correspond to a low grayscale image to prevent a horizontal line from being recognized due to a sensing in the low grayscale image, wherein the sensing frame periods are repeated with consecutive non-sensing frame periods provided therebetween,
wherein, in the non-sensing frame periods, no sensing of the pixels is performed during the vertical blank period, and
wherein, in the sensing frame periods, sensing of the pixels is performed during the vertical blank period.
2 . The display device of claim 1 , wherein the panel driver does not sense the first to n th pixel rows in the non-sensing frame periods.
3 . The display device of claim 2 , wherein the panel driver includes:
a scan driver which provides scan signals to the plurality of pixels;
a data driver which provides data voltages to the plurality of pixels, and receives sensing voltages from the plurality of pixels; and
a timing controller which controls a driving of the scan driver and a driving of the data driver.
4 . The display device of claim 3 , wherein each of the plurality of pixels includes:
a first transistor connected between a first power line and a second node, wherein the first transistor has a gate electrode connected to a first node;
a second transistor connected between a data line and the first node, wherein the second transistor has a gate electrode connected to a first scan line;
a third transistor connected between a reference line and the second node, wherein the third transistor has a gate electrode connected to a second scan line;
a storage capacitor connected between the first node and the second node; and
a light emitting diode connected between the second node and a second power line.
5 . The display device of claim 4 , wherein the timing controller controls the driving of the data driver such that the first to n th pixel rows are not sensed in the non-sensing frame periods.
6 . The display device of claim 4 , wherein the timing controller controls the driving of the scan driver such that the first to n th pixel rows are not sensed in the non-sensing frame periods.
7 . The display device of claim 6 , wherein a scan signal for turning-off the second transistor is provided to the gate electrode of the second transistor of each of the plurality of pixels in a vertical blank period of each of the non-sensing frame periods.
8 . The display device of claim 3 , wherein the timing controller includes:
a low grayscale determiner which determines whether the input image data correspond to the low grayscale image;
a sensing method determiner which determines a sensing method of the first to n th pixel rows according to whether the input image data correspond to the low grayscale image; and
a sensing pixel row selector which selects a pixel row to be sensed among the first to n th pixel rows based on the determined sensing method.
9 . The display device of claim 1 , wherein the panel driver senses the first pixel row or the n th pixel row in the non-sensing frame periods.
10 . The display device of claim 9 , wherein the panel driver senses the first pixel row in each of the non-sensing frame periods.
11 . The display device of claim 9 , wherein the panel driver senses the n th pixel row in each of the non-sensing frame periods.
12 . The display device of claim 1 , wherein a number of the consecutive non-sensing frame periods is greater than or equal to a first reference value and less than or equal to a second reference value greater than the first reference value.
13 . The display device of claim 1 , wherein the input image data correspond to the low grayscale image when a ratio of grayscales less than or equal to a reference grayscale among grayscales of the input image data is greater than or equal to a reference ratio.
14 . The display device of claim 1 , wherein the panel driver randomly or sequentially senses one of the first to n th pixel rows in each of the sensing and non-sensing frame periods when the input image data do not correspond to the low grayscale image.
15 . The display device of claim 1 , further comprising:
a temperature calculator which calculates temperature data for the display panel based on the sensing data.
16 . The display device of claim 1 , further comprising:
an overcurrent detector which detects an overcurrent of the display panel based on the sensing data.
17 . A method of driving a display device, the method comprising:
driving a display panel of the display device in response to input image data during frame periods, each frame period comprises an active period and a vertical blank period;
determining whether the input image data correspond to a low grayscale image; and
randomly sensing one of first to n th pixel rows in each of a plurality of sensing frame periods when the input image data correspond to the low grayscale image to prevent a horizontal line from being recognized due to a sensing in the low grayscale image,
wherein the sensing frame periods are repeated with consecutive non-sensing frame periods provided therebetween,
wherein n is a natural number greater than 1,
wherein, in the non-sensing frame periods, no sensing of pixels is performed during the vertical blank period, and
wherein, in the sensing frame periods, sensing of the pixels is performed during the vertical blank period.
18 . The method of claim 17 , wherein the first pixel row or the n th pixel row is sensed in the non-sensing frame periods.
19 . The method of claim 17 , wherein the input image data correspond to the low grayscale image when a ratio of grayscales less than or equal to a reference grayscale among grayscales of the input image data is greater than or equal to a reference ratio.
20 . The method of claim 17 , further comprising:
randomly or sequentially sensing one of the first to n th pixel rows in each of the sensing and non-sensing frame periods when the input image data do not correspond to the low grayscale image.
21 . An electronic device, comprising:
a display panel which includes a plurality of pixels arranged in first to n th pixel rows, wherein n is a natural number greater than 1; and
a panel driver which drives the display panel in response to input image data during frame periods, and generates sensing data by sensing the plurality of pixels, each frame period comprises an active period and a vertical blank period,
wherein the panel driver randomly senses one of the first to n th pixel rows in each of a plurality of sensing frame periods when the input image data correspond to a low grayscale image to prevent a horizontal line from being recognized due to a sensing in the low grayscale image, wherein the sensing frame periods are repeated with consecutive non-sensing frame periods provided therebetween,
wherein, in the non-sensing frame periods, no sensing of the pixels is performed during the vertical blank period, and
wherein, in the sensing frame periods, sensing of the pixels is performed during the vertical blank period.