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CN-116416955-B - Display device and driving method thereof

CN116416955BCN 116416955 BCN116416955 BCN 116416955BCN-116416955-B

Abstract

A display apparatus and a driving method thereof are disclosed. The display device includes a display panel including a plurality of pixels configured to be variably driven between a first refresh rate and a second refresh rate different from the first refresh rate, a processor configured to output a frequency change command signal representing a switching request between the first refresh rate and the second refresh rate, and a timing controller to differently control a time at which a refresh rate of the plurality of pixels is varied between the first refresh rate and the second refresh rate according to a time position of the frequency change command signal received from the processor.

Inventors

  • JIN YINGGAO
  • Liu Zhunhao

Assignees

  • 乐金显示有限公司

Dates

Publication Date
20260505
Application Date
20221208
Priority Date
20211227

Claims (20)

  1. 1. A display device, comprising: A display panel comprising a plurality of pixels configured to be variably driven between a first refresh rate and a second refresh rate different from the first refresh rate; A processor configured to output a frequency change command signal, the frequency change command signal representing a request to switch between the first refresh rate and the second refresh rate, and A timing controller that differently controls a time at which a refresh rate of the plurality of pixels is changed between the first refresh rate and the second refresh rate according to a time position of a frequency change command signal received from the processor, Wherein, in response to the timing controller receiving the frequency change command signal during a last one of a plurality of frame hops, the timing controller is configured to control a time for which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate in accordance with a first synchronization signal, Wherein, in response to the timing controller receiving the frequency change command signal during a frame skip preceding a last frame skip of the plurality of frame skips, the timing controller is configured to control a time at which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate in accordance with a second synchronization signal, Wherein the first synchronization signal and the second synchronization signal have the same period as each other and different phases from each other.
  2. 2. The display device of claim 1, wherein the plurality of pixels are driven at the first refresh rate during the plurality of skip frames and first refresh frames that are distinguished from each other with respect to the first synchronization signal, the plurality of pixels are driven at the second refresh rate during the plurality of second refresh frames that are distinguished from each other with respect to the first synchronization signal, Wherein first image data is applied to the plurality of pixels during the first refresh frame and maintained in the plurality of pixels during at least one of the plurality of skip frames.
  3. 3. The display device of claim 2, wherein in response to the timing controller receiving the frequency change command signal during a last frame skip, the timing controller is configured to: During the last frame skip, a transmission request signal for refresh-driven second image data is output to the processor based on the first synchronization signal, a pixel driving voltage applied to the plurality of pixels is changed from a first voltage to a second voltage greater than the first voltage, and the refresh rate is changed from the first refresh rate to the second refresh rate greater than the first refresh rate.
  4. 4. The display device of claim 2, wherein the timing controller differently controls a time at which the refresh rate varies between the first refresh rate and the second refresh rate based on whether the frequency change command signal is received during a frame skip preceding the second synchronization signal or a frame skip following the second synchronization signal in response to the timing controller receiving the frequency change command signal during one frame skip preceding a last frame skip.
  5. 5. The display device of claim 4, wherein in response to receiving the frequency change command signal during one frame skip earlier than the second synchronization signal, the timing controller is configured to: during the one frame skip, a transmission request signal for refresh-driven second image data is output to the processor based on the second synchronization signal, a pixel driving voltage applied to the plurality of pixels is changed from a first voltage to a second voltage greater than the first voltage, and the refresh rate is changed from the first refresh rate to the second refresh rate greater than the first refresh rate.
  6. 6. The display device of claim 4, wherein in response to receiving the frequency change command signal during one frame skip after the second synchronization signal, the timing controller is configured to: Outputting a transmission request signal for refresh-driven second image data to the processor based on the second synchronization signal during another one of the plurality of frame jumps that is located after the one frame jump, changing a pixel driving voltage applied to the plurality of pixels from a first voltage to a second voltage that is greater than the first voltage, and changing the refresh rate from the first refresh rate to the second refresh rate that is greater than the first refresh rate.
  7. 7. A display device according to any one of claims 3, 5 and 6, wherein the pixel driving voltage is a voltage for initializing an anode of a light emitting device constituting each pixel.
  8. 8. The display apparatus of claim 7, wherein the timing controller controls the pixel driving voltage to a second voltage having a first level in the refresh frame, and controls the pixel driving voltage to a first voltage having a second level lower than the first level in the skip frame.
  9. 9. The display apparatus of claim 8, wherein the timing controller shifts the pixel drive voltage from the second level to the first level for refresh drive of a next refresh frame upon receiving the frequency change command signal from the processor in a last skip frame.
  10. 10. The display device according to claim 1, wherein the timing controller is configured to recognize interrupt information contained in the frequency change command signal, and to perform the refresh rate change operation in a frame skip arranged at a reception time of the frequency change command signal in response to the interrupt information to irregularly change the refresh rate before the operation of the first refresh rate is completed.
  11. 11. A driving method of a display device including a plurality of pixels configured to be variably driven between a first refresh rate and a second refresh rate different from the first refresh rate, the driving method comprising: Outputting, by a processor of the display device, a frequency change command signal to a timing controller of the display device, the frequency change command signal representing a request to switch between the first refresh rate and the second refresh rate, and Controlling, by the timing controller, the time at which the refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate differently according to the time position of the frequency change command signal received from the processor, Wherein the time to differently control the refresh rate variation comprises: In response to the timing controller receiving the frequency change command signal during a last one of a plurality of frame hops, controlling, by the timing controller, a time at which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate in accordance with a first synchronization signal, Wherein, in response to the timing controller receiving the frequency change command signal during one of the plurality of frame hops that precedes a last frame hop, a time at which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate is controlled by the timing controller in accordance with a second synchronization signal, Wherein the first synchronization signal and the second synchronization signal have the same period as each other and different phases from each other.
  12. 12. The driving method according to claim 11, wherein the plurality of pixels are driven at the first refresh rate during the plurality of skip frames and first refresh frames that are distinguished from each other with respect to the first synchronization signal, the plurality of pixels are driven at the second refresh rate during the plurality of second refresh frames that are distinguished from each other with respect to the first synchronization signal, Wherein first image data is applied to the plurality of pixels during the first refresh frame and maintained in the plurality of pixels during at least one of the plurality of skip frames.
  13. 13. The driving method of claim 12, wherein controlling the time of the refresh rate change according to the first synchronization signal comprises: determining, by the timing controller, whether the frequency change command signal was received from the processor during a last frame skip, and During the last frame skip, a transmission request signal for refresh-driven second image data is output to the processor based on the first synchronization signal, a pixel driving voltage applied to the plurality of pixels is changed from a first voltage to a second voltage greater than the first voltage, and the refresh rate is changed from the first refresh rate to the second refresh rate greater than the first refresh rate.
  14. 14. The driving method of claim 12, wherein controlling the time of the refresh rate change according to the second synchronization signal comprises: Determining, by the timing controller, whether the frequency change command signal was received during a frame that is earlier than the last frame, and During one frame skip after the second synchronization signal, the time at which the refresh rate is changed between the first refresh rate and the second refresh rate is controlled differently by the timing controller based on whether the frequency change command signal is received during a frame skip before the second synchronization signal or in a frame skip after the second synchronization signal.
  15. 15. The driving method of claim 14, wherein differently controlling the time of the refresh rate change comprises: In response to receiving the frequency change command signal during one frame skip earlier than the second synchronization signal, outputting, by the timing controller, a transmission request signal for refresh-driven second image data to the processor based on the second synchronization signal during the one frame skip, changing a pixel driving voltage applied to the plurality of pixels from a first voltage to a second voltage greater than the first voltage, and changing the refresh rate from the first refresh rate to the second refresh rate greater than the first refresh rate.
  16. 16. The driving method of claim 14, wherein differently controlling the time of the refresh rate change comprises: In response to receiving the frequency change command signal during one frame skip after the second synchronization signal, outputting, by the timing controller, a transmission request signal for refresh-driven second image data to the processor during another frame skip after the one frame skip among the plurality of frame skips, changing a pixel driving voltage applied to the plurality of pixels from a first voltage to a second voltage greater than the first voltage, and changing the refresh rate from the first refresh rate to the second refresh rate greater than the first refresh rate based on the second synchronization signal.
  17. 17. A driving method according to any one of claims 13, 15 and 16, wherein the pixel driving voltage is a voltage for initializing an anode of a light emitting device constituting each pixel.
  18. 18. The driving method of claim 17, wherein the pixel driving voltage is controlled to have a second voltage of a first level by using the timing controller in the refresh frame, and the pixel driving voltage is controlled to have a first voltage of a second level lower than the first level by using the timing controller in the skip frame.
  19. 19. The driving method of claim 18, wherein the pixel driving voltage is shifted from the second level to the first level by using the timing controller for refresh driving of a next refresh frame when the frequency change command signal is received from the processor in a last skip frame.
  20. 20. The driving method according to claim 11, wherein differently controlling the time of the refresh rate change comprises: The refresh rate is irregularly changed before the operation of the first refresh rate is completed by identifying interrupt information contained in the frequency change command signal using the timing controller and performing a change operation of the refresh rate in a frame skip arranged at a reception time of the frequency change command signal in response to the interrupt information.

Description

Display device and driving method thereof Cross Reference to Related Applications The present application claims the benefit of korean patent application No.10-2021-0188751 filed on day 27, 12 of 2021, which is incorporated herein by reference as if fully set forth herein. Technical Field The present invention relates to a display device and a driving method thereof. Background As one of various functions required for the display device, a Variable Refresh Rate (VRR) is used. VRR is a technique of driving pixels at a certain refresh rate and then increasing the refresh rate at a time when high-speed driving is required, or decreasing the refresh rate at a time when power consumption or low-speed driving is required, thereby operating the pixels. Refresh rate may refer to a frame rate or frame rate. When the refresh rate is changed based on the VRR (for example, when the refresh rate is suddenly increased at a low speed driving), an interface timing (INTERFACE TIMING) associated with transmission of an image signal may be delayed or a time when a pixel driving voltage to be supplied to a pixel is changed may be delayed, thereby causing image distortion. Therefore, there is a need to minimize image distortion in a display device due to a change in refresh rate. Disclosure of Invention In order to overcome the above-described problems of the related art, the present invention may provide a display device and a driving method thereof, which may minimize image distortion due to a change in a refresh rate. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a display device includes a display panel including a plurality of pixels variably driven between a first refresh rate and a second refresh rate higher than the first refresh rate, a processor outputting a frequency change command signal under predetermined specific conditions, and a timing controller differently controlling a change time of the refresh rate based on the plurality of pixels according to a time position of the frequency change command signal received from the processor. In another aspect of the present invention, there is provided a driving method of a display device including a plurality of pixels variably driven between a first refresh rate and a second refresh rate higher than the first refresh rate, the driving method including outputting a frequency change command signal under a predetermined specific condition by using a processor, and differently controlling a change time of the refresh rate based on the plurality of pixels by using a timing controller according to a time position of the frequency change command signal received from the processor. In one or more embodiments, a display device is provided that includes a display panel including a plurality of pixels configured to be variably driven between a first refresh rate and a second refresh rate different from the first refresh rate, a processor configured to output a frequency change command signal representing a request to switch between the first refresh rate and the second refresh rate, and a timing controller to differently control a time at which a refresh rate of the plurality of pixels is changed between the first refresh rate and the second refresh rate according to a temporal position of the frequency change command signal received from the processor. In one or more embodiments, the plurality of pixels are driven at the first refresh rate during a plurality of skip frames and a first refresh frame that are distinguished from each other with respect to a first synchronization signal, the plurality of pixels are driven at the second refresh rate during a plurality of second refresh frames that are distinguished from each other with respect to the first synchronization signal, wherein first image data is applied to the plurality of pixels during the first refresh frame, and the first image data is held in the plurality of pixels during at least one of the plurality of skip frames. In one or more embodiments, in response to the timing controller receiving the frequency change command signal during a last one of the plurality of frames, the timing controller is configured to control a time at which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate in accordance with the first synchronization signal, wherein in response to the timing controller receiving the frequency change command signal during one of the plurality of frames that precedes the last one of the plurality of frames, the timing controller is configured to control a time at which a refresh rate of the plurality of pixels changes between the first refresh rate and the second refresh rate in accordance with a second synchronization signal, wherein the first synchronization signal and the second synchronization signal have a same period as each other and a different phase f