Display device, driving controller, and method of driving display device
A display device is disclosed that includes a pixel component configured to output an image based on a first driving frequency, a scan driver configured to sequentially provide a scan signal to each pixel row in each frame based on the first driving frequency, and a driving controller configured control the scan driver such that, in the case where image data includes data corresponding to a static image, a display area is divided into a first area for the static image, and a second area for a video, and the first area is driven at a second driving frequency, and the second area is driven at a third driving frequency. The driving controller may control the scan driver such that a driving frequency corresponding to the first area is reduced to the second driving frequency, and a driving frequency corresponding to the second area is increased to the third driving frequency.
1. A display device comprising:
a pixel component configured to output an image refreshed in each frame based on a preset first driving frequency, and including a plurality of pixel rows each including a plurality of pixels;
a scan driver configured to sequentially provide a scan signal to each of the plurality of pixel rows in each frame according to the first driving frequency; and
a driving controller configured to control the scan driver such that, a display area included in the pixel component is divided into a first area, and a second area, and pixels included in the first area are driven at a second driving frequency different from the first driving frequency, and pixels included in the second area are driven at a third driving frequency different from the first driving frequency,
wherein the driving controller controls the scan driver such that a driving frequency corresponding to the first area changes from the first driving frequency to the second driving frequency over a first time period, and a driving frequency corresponding to the second area changes from the first driving frequency to the third driving frequency over a second time period.
2. The display device according to claim 1 , wherein the driving controller comprises:
a static image detector configured to check whether the image data includes data corresponding to the static image, and generate, in a case where the image data includes the data corresponding to the static image, region information that is information about regions occupied by the first area and the second area in the pixel component;
a frequency determiner configured to determine a driving frequency of each display area in the pixel component, based both on whether the image data includes the data corresponding to the static image and on the region information; and
a hold frame determiner configured to set, in a case whether the image data includes the data corresponding to the static image, some of the plurality of frames to hold frames in each of which an image displayed in the first area in a preceding frame is maintained without being refreshed, based on information about the determined frequency.
3. The display device according to claim 2 , wherein the frequency determiner
determines a driving frequency corresponding to an entirety of the display area to be the first driving frequency in a case where the image data does not include the data corresponding to the static image, and
determines, in a case where the image data includes the data corresponding to the static image, the driving frequency corresponding to the first area of the display area to be the second driving frequency, and determines the driving frequency corresponding to the second area to be the third driving frequency.
4. The display device according to claim 2 , wherein the driving controller
controls, when gradually reducing the first driving frequency to the second driving frequency, the pixel component and the scan driver such that the first driving frequency is reduced to the second driving frequency by a plurality of steps, and at each of the steps, the display device is driven during a plurality of preset frames at a driving frequency reduced from a driving frequency of a preceding step by a preset step frequency, and
controls, when gradually increasing the first driving frequency to the third driving frequency, the pixel component and the scan driver such that the first driving frequency is increased to the third driving frequency by a plurality of steps, and at each of the steps, the display device is driven during the plurality of preset frames at a driving frequency increased from a driving frequency of a preceding step by a preset step frequency, and
wherein the first time period and the second time period are determined depending on a size of the preset step frequency and the number of preset frames.
5. The display device according to claim 4 ,
wherein each of the hold frames includes a refresh section in which the second area is refreshed, and a hold section in which an image displayed in the first area in a preceding frame is maintained, and
wherein the scan driver sequentially provides, in the refresh section, the scan signal to only the pixel rows that correspond to the second area.
6. The display device according to claim 5 , wherein the driving controller controls, when increasing the driving frequency corresponding to the second area from the first driving frequency to the third driving frequency, the pixel component and the scan driver such that the refresh section is allocated to a first sub-frame, the hold section is allocated to a second sub-frame, and successive images are displayed during the first sub-frame and the second sub-frame.
7. The display device according to claim 6 , wherein the scan driver
sequentially provides the scan signal to the pixel rows that correspond to the second area among the plurality of pixel rows during the first sub-frame, and thereafter
sequentially provides the scan signal to the pixel rows that correspond to the second area among the plurality of pixel rows during the second sub-frame.
8. The display device according to claim 5 , further comprising a data driver configured to provide, through a data line connected to each of a plurality of pixel columns each including a plurality of pixels, a data voltage corresponding to the image data to the plurality of pixels in synchronization with the scan signal in each frame,
wherein the data driver sequentially provides, in the refresh section, the data voltage corresponding to the image data to only the pixels included in the pixel rows that correspond to the second area.
9. The display device according to claim 7 , further comprising a data driver configured to provide, through a data line connected to each of a plurality of pixel columns each including a plurality of pixels, a data voltage corresponding to the image data to the plurality of pixels in synchronization with the scan signal in each frame,
wherein the driving controller
controls the data driver such that a data voltage corresponding to a first image is provided to the pixels included in the second area in the first sub-frame, and
controls the data driver such that a data voltage corresponding to a second image different from the first image and successive to the first image is provided to the pixels included in the second area in the second sub-frame.
10. The display device according to claim 6 , wherein, in a first mode for reducing power consumption of the display device, the hold frame determiner further set some of the plurality of frames other than the already set hold frames to additional hold frames so that the driving frequency corresponding to the first area is reduced to a value lower than the second driving frequency.
11. The display device according to claim 10 , wherein the driving controller allocates, in a second mode for high speed driving, the refresh section and the hold section included in at least one hold frame among the additional hold frames to the first sub-frame and the second sub-frame, respectively, so that the driving frequency corresponding to the second area is increased to a value higher than the third driving frequency.
12. A method of driving a display device for displaying an image refreshed in each frame based on a preset first driving frequency, the method comprising:
dividing, in a case where image data that is received from an external device and corresponds to a plurality of successive frames includes data corresponding to a static image, a display area included in the display device into a first area in which the static image is displayed, and a second area in which a video is displayed; and
driving pixels included in the first area at a second driving frequency less than the first driving frequency, and driving pixels included in the second area at a third driving frequency greater than the first driving frequency.
13. The method according to claim 12 , further comprising:
checking whether the image data includes data corresponding to the static image; and
determining the driving frequency corresponding to the first area to be the second driving frequency, and determining the driving frequency corresponding to the second area to be the third driving frequency,
wherein checking whether the image data includes the data corresponding to the static image comprises generating, in a case where the image data includes the data corresponding to the static image, region information that is information about regions occupied by the first area and the second area in the display area,
wherein determining the driving frequency corresponding to the first area and the driving frequency corresponding to the second area comprises determining a driving frequency of each display area in a pixel component included in the display device, based both on whether the image data includes the data corresponding to the static image and on the region information.
14. The method according to claim 13 , further comprising setting, in a case whether the image data includes the data corresponding to the static image, some of the plurality of frames to hold frames in each of which an image displayed in the first frame in a preceding frame is maintained without being refreshed.
15. The method according to claim 13 , wherein determining the driving frequency corresponding to the first area and the driving frequency corresponding to the second area comprises:
determining a driving frequency corresponding to an entirety of the display area to be the first driving frequency in a case where the image data does not include the data corresponding to the static image; and
determining, in a case where the image data includes the data corresponding to the static image, the driving frequency corresponding to the first area of the display area to be the second driving frequency, and determining the driving frequency corresponding to the second area to be the third driving frequency.
16. The method according to claim 12 ,
wherein the driving frequency corresponding to the first area is reduced from the first driving frequency to the second driving frequency by a plurality of steps, and at each step included in the plurality of steps, the driving frequency corresponding to the first area is reduced from a driving frequency determined at a preceding step by a preset step frequency and then is maintained for a preset time, and
wherein the driving frequency corresponding to the second area is increased from the first driving frequency to the third driving frequency by a plurality of steps, and at each step included in the plurality of steps, the driving frequency corresponding to the second area is increased from a driving frequency determined at a preceding step by a preset step frequency and then is maintained for the preset time.
17. The method according to claim 14 ,
wherein each of the hold frames includes a fresh section in which the second area is refreshed, and a hold section in which an image displayed in the first area in a preceding frame is maintained, and
wherein driving the pixels included in the first area and the pixels included in the second area further comprises sequentially providing, to each of a plurality of pixel rows included in the display area and each including a plurality of pixels, a scan signal for driving the pixels included in the display area in each frame based on the first driving frequency, and
wherein providing the scan signal comprises sequentially providing, in a case where the image data includes the data corresponding to the static image, the scan signal to only the pixel rows that correspond to the second area in each frame in the refresh section.
18. The method according to claim 17 , wherein driving the pixels included in the first area and the pixels included in the second area further comprises driving, when increasing the driving frequency corresponding to the second area from the first driving frequency to the third driving frequency, the pixels included in the first area and the pixels included in the second area such that the refresh section is allocated to a first sub-frame, the hold section is allocated to a second sub-frame, and successive images are displayed during the first sub-frame and the second sub-frame.
19. The method according to claim 18 , wherein providing the scan signal comprises sequentially providing the scan signal to the pixel rows that correspond to the second area among the plurality of pixel rows during the first sub-frame, and then sequentially providing the scan signal to the pixel rows that correspond to the second area among the plurality of pixel rows during the second sub-frame.
20. The method according to claim 19 ,
wherein driving the pixels included in the first area and the pixels included in the second area further comprises providing, through a data line connected to each of a plurality of pixel columns each including a plurality of pixels, a data voltage corresponding to the image data to the plurality of pixels in synchronization with the scan signal in each frame, and
wherein providing the data voltage comprises providing a data voltage corresponding to a first image to the pixels included in the second area in the first sub-frame, and providing a data voltage corresponding to a second image different from the first image and successive to the first image to the pixels included in the second area in the second sub-frame.
21. A driving controller configured to control an operation of driving a display device at a first driving frequency based on image data that is received from an external device and corresponds to a plurality of frames, the driving controller comprising:
a static image detector configured to generate, region information that is information about regions occupied by a first area and a second area of a display area of the display device;
a frequency determiner configured to determine, based on the region information, a driving frequency of the first area to be a second driving frequency different from the first driving frequency, and determine a driving frequency of the second area to be a third driving frequency different from the first driving frequency; and
a control signal generator configured to generate a control signal for controlling the display device such that, based on the determined frequency information, a driving frequency corresponding to the first area changes from the first driving frequency to the second driving frequency over a first time period, and a driving frequency corresponding to the second area changes from the first driving frequency to the third driving frequency over a second time period.
22. The driving controller according to claim 21 , further comprising a hold frame determiner configured to set, based on the determined frequency information, some of the plurality of frames to hold frames in each of which an image displayed in the first area in a preceding frame is maintained without being refreshed.