Patent Application
20240144875
The present application claims priority to Korean patent application number 10-2022-0140689 filed on, Oct. 27, 2022, the entire disclosure of which is incorporated herein in its entirety by reference.
The present disclosure relates to a display device, a driving controller, and a method of driving the display device.
With the development of information technology, the importance of display devices, which are connection mediums between a user and information, have become more important. Owing to the importance of display devices, the use of various kinds of display devices, such as liquid crystal display devices and organic light emitting display devices, has increased.
Various embodiments of the present disclosure may be directed to a display device in which, in the case where image data includes a static image, an area provided to display the static image is driven at a low frequency, and an area provided to display a video is driven at a high frequency, so that a high-quality image can be provided to a user.
An embodiment of the present disclosure may provide a display device including: 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, in the 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 pixel component is divided into a first area in which the static image is displayed, and a second area in which a video is displayed, and pixels included in the first area are driven at a second driving frequency less than the first driving frequency, and pixels included in the second area are driven at a third driving frequency greater than the first driving frequency. The driving controller may control the scan driver such that a driving frequency corresponding to the first area is gradually reduced from the first driving frequency to the second driving frequency over a first time period, and a driving frequency corresponding to the second area is gradually increased from the first driving frequency to the third driving frequency over a second time period.
In an embodiment, the driving controller may include: a static image detector configured to check whether the image data includes data corresponding to the static image, and generate, in the 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 the 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.
In an embodiment, the frequency determiner may determine a driving frequency corresponding to an entirety of the display area to be the first driving frequency in the case where the image data does not include the data corresponding to the static image, and may determine, in the 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.
In an embodiment, the driving controller may control, 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 may control, 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. The first time and the second time may be determined depending on a size of the preset step frequency and the number of preset frames.
In an embodiment, each of the hold frames may include 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. The scan driver may sequentially provide, in the refresh section, the scan signal to only the pixel rows that correspond to the second area.
In an embodiment, the driving controller may control, 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.
In an embodiment, the scan driver may sequentially provide 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 provide the scan signal to the pixel rows that correspond to the second area among the plurality of pixel rows during the second sub-frame.
In an embodiment, the display device may further include 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. The data driver may sequentially provide, 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.
In an embodiment, the display device may further include 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. The driving controller may control 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 control 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.
In an embodiment, in a first mode for reducing power consumption of the display device, the hold frame determiner may 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.
In an embodiment, the driving controller may allocate, 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.
An embodiment of the present disclosure may provide a method of driving a display device for displaying an image refreshed in each frame based on a preset first driving frequency. The method may include: dividing, in the 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. Driving the pixels included in the first area and the pixels included in the second area may include gradually reducing a driving frequency corresponding to the first area from the first driving frequency to the second driving frequency over a first time period, and gradually increasing a driving frequency corresponding the second area from the first driving frequency to the third driving frequency over a second time period.
In an embodiment, the method may further include: 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. Checking whether the image data includes the data corresponding to the static image may include generating, in the 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. Determining the driving frequency corresponding to the first area and the driving frequency corresponding to the second area may include 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.
In an embodiment, the method may further include setting, in the 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.
In an embodiment, determining the driving frequency corresponding to the first area and the driving frequency corresponding to the second area may include: determining a driving frequency corresponding to an entirety of the display area to be the first driving frequency in the case where the image data does not include the data corresponding to the static image; and determining, in the 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.
In an embodiment, the driving frequency corresponding to the first area may be 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 may be reduced from a driving frequency determined at a preceding step by a preset step frequency and then be maintained for a preset time. The driving frequency corresponding to the second area may be 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 may be increased from a driving frequency determined at a preceding step by a preset step frequency and then be maintained for the preset time.
In an embodiment, each of the hold frames may include 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. Driving the pixels included in the first area and the pixels included in the second area may further include 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. Providing the scan signal may include sequentially providing, in the 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.
In an embodiment, driving the pixels included in the first area and the pixels included in the second area may further include 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.
In an embodiment, providing the scan signal may include 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.
In an embodiment, driving the pixels included in the first area and the pixels included in the second area may further include 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. Providing the data voltage may include 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.
An embodiment of the present disclosure may provide 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 may include a static image detector configured to generate, in the case where the image data includes data corresponding to a static image, region information that is information about regions occupied by a first area and a second area of a display area of the display device, the first area being provided to display the static image, and the second area being provided to display a video; a frequency determiner configured to determine, based on the region information, a driving frequency of the first area to be a second driving frequency lower than the first driving frequency, and determine a driving frequency of the second area to be a third driving frequency higher than 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 is gradually reduced from the first driving frequency to the second driving frequency over a first time period, and a driving frequency corresponding to the second area is gradually increased from the first driving frequency to the third driving frequency over a second time period.
In an embodiment, the driving controller may further include 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.
Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, such that those skilled in the art can easily implement the present invention. The present disclosure may be embodied in various different forms without being limited to embodiments to be described herein.
In the drawings, portions which are not related to the present disclosure will be omitted in order to explain the present disclosure more clearly. Reference should be made to the drawings, in which similar reference numerals are used throughout the different drawings to designate similar components. Therefore, the aforementioned reference numerals may be used in other drawings.
For reference, the size of each component and the thicknesses of lines illustrating the component are arbitrarily represented for the sake of explanation, and the present disclosure is not limited to what is illustrated in the drawings. In the drawings, the thicknesses of the components may be exaggerated to clearly depict multiple layers and areas.
Furthermore, the expression “being the same” may mean “being substantially the same”. In other words, the expression “being the same” may include a range that can be tolerated by those skilled in the art. The other expressions may also be expressions from which “substantially” has been omitted.
As used herein, the word “or” means logical “or” so that, unless the context indicates otherwise, the expression “A, B, or C” means “A and B and C,” “A and B but not C,” “A and C but not B,” “B and C but not A,” “A but not B and not C,” “B but not A and not C,” and “C but not A and not B.”
Referring to
The display device 100 may be a flat display device, a flexible display device, a curved display device, a foldable display device, or a bendable display device. Furthermore, the display device 100 may be applied to a transparent display device, a head-mounted display device, a wearable display device, or the like. Furthermore, the display device 100 may be applied to various electronic devices such as a smartphone, a tablet PC, a smart pad, a TV, and a monitor.
The display device 100 may be implemented as an organic light emitting display device, a liquid crystal display device, or the like. However, the foregoing is only for illustrative, and the configuration of the display device 100 is not limited thereto. For example, the display device 100 may be a self emissive display device including an inorganic light emitting element.
The pixel component 110 may include pixels PX connected to data lines DL1 to DLm (where m is a natural number), scan lines SL1 to SLn (where n is a natural number), and emission control lines E1 to En (where n is a natural number). The pixels PX may be supplied with voltages of a first power supply ELVDD and a second power supply ELVSS from an external device.
In an embodiment, a plurality of pixels PX are formed of a plurality of pixel rows which respectively correspond to the scan lines SL1 to SLn or the emission control lines E1 to En. Each of the plurality of pixel rows may include a plurality of pixels.
Although
The driving controller 140 may generate a data driving control signal DCS, a scan driving control signal SCS, an emission control signal ECS, and a power driving control signal PCS in response to synchronization signals CS supplied from an external device. Generated from the driving controller 140, the data driving control signal DCS may be supplied to the data driver 130, the scan driving control signal SCS may be supplied to the scan driver 120, and the power driving control signal PCS may be supplied to the power supply 160.
In an embodiment, the driving controller 140 may receive image data corresponding to a plurality of successive frames from an external device. Image data received from the external device may include data corresponding to a static image. In this case, the driving controller 140 may divide a display area included in the pixel component 110 into a first area for displaying a static image and a second area for displaying a video. The driving controller 140 may drive pixels included in the first area at a second driving frequency, and drive pixels included in the second area at a third frequency different from the second driving frequency. Here, the second driving frequency may be less than a first driving frequency. The third driving frequency may be greater than the first driving frequency. The first driving frequency may be a driving frequency which is used, in the case where only a video is included in image data received from an external device, to output the video to the display area included in the pixel component 110.
The data driving control signal DCS may include a source start signal and clock signals. The source start signal may control a data sampling start time. The clock signals may be used to control a sampling operation.
The scan driving control signal SCS may include a scan start signal, a control start signal, and clock signals. The scan start signal may control a timing of a scan signal. The control start signal may control a timing of a control signal. The clock signals may be used to shift the scan start signal or the control start signal.
The emission driving control signal ECS may include an emission control start pulse and clock signals. The emission control start pulse may control a first timing of an emission control signal to be output from the emission driver 150. The clock signals may be used to shift the emission control start pulse.
The power driving control signal PCS may control the supply and voltage levels of the first power supply ELVDD and the second power supply ELVSS.
The scan driver 120 may receive a scan driving control signal SCS from the driving controller 140. The scan driver 120 that has been supplied with the scan driving control signal SCS may supply scan signals to the scan lines SL1 to SLn.
For example, the scan driver 120 may sequentially supply the scan signals to the scan lines SL1 to SLn. If the scan signals are sequentially supplied to the scan lines SL1 to SLn, the pixels PX may be selected on a horizontal line basis. To this end, the scan signals may be set to a gate-on voltage (e.g., a logic high level) so that transistors included in the pixels PX may be turned on.
In an embodiment, in the case where data corresponding to a static image is included in the image data, the scan driver 120 may not provide, during a preset hold frame, scan signals to pixels included in an area where the static image is displayed in the pixel component 110.
The data driver 130 may be supplied with the data driving control signal DCS and the image data from the driving controller 140. The data driver 130 may provide a data signal for displaying an image to the pixel component 110 based on the image data.
In an embodiment, in the case where data corresponding to a static image is included in the image data, the data driver 130 may not provide, during a preset hold frame, data signals to pixels included in the area where the static image is displayed in the pixel component 110.
The emission driver 150 may receive a clock signal, and an emission stop signal, and the like from the driving controller 140 and generate emission control signals to be provided to emission control lines E1 to En. The emission control signals may be sequentially supplied to the emission control lines E1 to En.
The emission control signals each may be set to a gate-off voltage (e.g., a high voltage). A transistor that receives the emission control signal may be turned off when the emission control signal is supplied thereto, and may be turned on in the other cases. Hereinafter, the expression “emission control signal is supplied” may be understood to mean that the emission control signal is supplied at a logic level that enables a transistor controlled by the emission control signal to be turned off. The power supply 160 may supply a voltage of the first power supply ELVDD and a voltage of the second power supply ELVSS based on the power driving control signal PCS. In an embodiment, the first power supply ELVDD may determine a voltage (e.g., a drain voltage) of a first electrode of a driving transistor, and the second power supply ELVSS may determine a cathode voltage of the light emitting element.
Referring to
In an embodiment, the light emitting element LD may be an organic light emitting diode including an organic light emitting layer. Alternatively, the light emitting element LD may be an inorganic light emitting element formed of inorganic material. As a further alternative, the light emitting element LD may have a shape in which a plurality of inorganic light emitting elements are connected in parallel or series between the second driving power line ELVSSL and the fourth node N4.
The first transistor T1 (which may be referred to as a driving transistor) may include a first electrode connected to a second node N2, and a second electrode connected to a third node N3. A gate electrode of the first transistor T1 is connected to a first node N1. The first transistor T1 may control, in response to the voltage of the first node N1, driving current flowing from a first driving power line ELVDD to the second driving power line ELVSS via the light emitting element LD. The first driving power line ELVDD may be set to a voltage higher than that of the second driving power line ELVSS.
The second transistor T2 may be connected between the j-th data line DLj and the second node N2. A gate electrode of the second transistor T2 may be connected to an i-th scan line SLi. The second transistor T2 may be turned on in response to a scan signal that has a gate-on level and is supplied to the i-th scan line SLi, and thus may electrically connect the j-th data line DLj and the second node N2 to each other.
The third transistor T3 may be connected between the first electrode (i.e., the fourth node N4) of the light emitting element LD and a power line PL configured to supply an initialization voltage Vint. A gate electrode of the third transistor T3 may be connected to an i-th scan line SLi. The third transistor T3 may be turned on in response to a scan signal that has a gate-on level and is supplied to the i-th scan line SLi, so that the initialization voltage Vint may be supplied to the first electrode (i.e., the fourth node N4) of the light emitting element LD.
The fourth transistor T4 may be connected between the first node N1 and the power line PL. A gate electrode of the fourth transistor T4 may be connected to an i-th scan line SLi−1. The fourth transistor T4 may be turned on in response to a scan signal that has a gate-on level and is supplied to the i−1-th scan line SLi−1, so that the initialization voltage Vint may be supplied to the first node N1.
The fifth transistor T5 may be connected between the first driving power line ELVDD and the second node N2. A gate electrode of the fifth transistor T5 may be connected to an i-th emission control line Ei. The fifth transistor T5 may be turned on in response to an emission control signal that has a gate-on level and is supplied to the i-th emission control line Ei.
The sixth transistor T6 may be connected between the second electrode (i.e., the third node N3) of the first transistor T1 and the first electrode (i.e., the fourth node N4) of the light emitting element LD. A gate electrode of the sixth transistor T6 may be connected to the i-th emission control line Ei. The sixth transistor T6 may be turned on in response to an emission control signal that has a gate-on level and is supplied to the i-th emission control line Ei. Therefore, the fifth transistor T5 and the sixth transistor T6 may be simultaneously controlled.
The seventh transistor T7 may be connected between the second electrode (i.e., the third node N3) of the first transistor T1 and the first node N1. A gate electrode of the seventh transistor T7 may be connected to the i-th scan line SLi. The seventh transistor T7 may be turned on in response to a scan signal that has a gate-on level and is supplied to the i-th scan line SLi, and thus may electrically connect the second electrode of the first transistor T1 and the first node N1 to each other. If the seventh transistor T7 is turned on, the first transistor T1 is connected in the form of a diode.
The storage capacitor Cst may be connected between the first driving power line ELVDDL and the first node N1.
In addition, the scan lines to which the transistors T2, T3, T4, and T7 are connected may be changed in various ways. For example, the fourth transistor T4 may be connected to a separate scan line rather than to the i-th scan line SLi−1. Likewise, the third transistor T3 may also be connected to a separate scan line rather than to the i-th scan line Si.
In an embodiment, the pixel PXij may be a hybrid oxide polycrystalline (HOP) pixel. In this case, unlike the case illustrated in
Pixel components 110a, 110b, and 110c in
In the case where a static image and a video are displayed together in a display area of the pixel component 110a, 110b, or 110c, the display device may be driven in any one mode among the normal driving mode, the MFD driving mode, and the PBD driving mode. In an embodiment, the display device may be driven in the normal driving mode when only a video without a static image is displayed in the display area in the pixel component 110.
Referring to
In the MFD driving mode, the video display area may be driven at a first driving frequency, and the static image display area may be driven at a frequency less than the first driving frequency. The first driving frequency may refer to a driving frequency which is preset to output a video to the display area in the case where only video data is included in image data received from an external device. For example, in the case where the first driving frequency is set to 120 Hz, the video display area may be driven at 120 Hz, and the static image display area may be driven at 60 Hz. In other words, the video display area may be refreshed 120 times per second, and the static image display area may be refreshed 60 times per second.
In the PBD driving mode, the video display area may be driven at a frequency greater than the first driving frequency, and the static image display area may be driven at a frequency less than the first driving frequency. For example, in the case where the first driving frequency is set to 120 Hz, the video display area may be driven at 180 Hz, and the static image display area may be driven at 60 Hz. In other words, the video display area may be refreshed 180 times per second, and the static image display area may be refreshed 60 times per second.
Referring to
Referring to
The lower middle diagram of
Referring to
Referring to
Furthermore, in the hold frame, no data signal may be provided to the pixels that are included in the static image display area. Consequently, because some frames among a plurality of frames corresponding to the image data received from the external device are set to hold frames in which a static image is not refreshed, the driving frequency of the static image display area may be reduced.
The lower right diagram of
Referring to
Referring to
Consequently, because some frames among a plurality of frames corresponding to the image data received from the external device are set to hold frames in which a static image is not refreshed, the driving frequency of the static image display area may be reduced. Furthermore, as the hold section in each of the set hold frames is allocated to the second sub-frame, the driving frequency of the video display area may be increased.
In the case where the image data received from the external device includes only video data, the display device in accordance with an embodiment may be driven in the normal driving mode. For example, the entirety of the display area included in the pixel component 110 of
In the case where the image data received in the external device includes both video data and static image data, the display device may be driven in the MFD driving mode or the PBD driving mode. In the case where the driving mode of the display device is changed from the normal driving mode to the MFD driving mode, the driving frequency of the static image display area may be rapidly changed. Furthermore, in the case where the driving mode of the display device is changed from the normal driving mode to the PBD driving mode, the driving frequencies of the video display area and the static image display area may be rapidly changed. In this case, the user may discern a difference in luminance due to a rapid change in driving frequency.
Referring to
For example, the first driving frequency may be 120 Hz, and in the case of the target driving frequency, the driving frequency of the video display area may be set to 180 Hz, and the driving frequency of the static image display area may be set to 60 Hz. In an embodiment, the driving frequency of the static image display area may be reduced from the first driving frequency by a preset step frequency. The static image display area may be driven using the reduced driving frequency for a preset time. In an embodiment, the driving frequency of the video display area may be increased from the first driving frequency by a preset step frequency. The video display area may be driven using the increased driving frequency for a preset time.
The size of the step frequency and the time for which the display device is driven at a changed driving frequency may be preset and stored in a separate register (not illustrated) in the display device. Referring to
Referring to
In detail, at a first step, the driving frequency of the static image display area may be reduced to 100 Hz. The static image display area may be driven at 100 Hz for a second. At a subsequent step, the driving frequency of the static image display area may be reduced to 80 Hz. The static image display area may be driven at 80 Hz for a second. At a subsequent step, the driving frequency of the static image display area may be reduced to 60 Hz. The static image display area may be driven at 60 Hz for a second. While the driving frequency of the static image display area is changed, the driving frequency of the video display area may be maintained at 120 Hz.
At a fourth step, the driving frequency of the video display area may be increased to 140 Hz. The video display area may be driven at 140 Hz for a second. At a subsequent step, the driving frequency of the video display area may be increased to 160 Hz. The video display area may be driven at 160 Hz for a second. At a subsequent step, the driving frequency of the video display area may be increased to 180 Hz. While the driving frequency of the video display area is changed, the driving frequency of the static image display area may be maintained at 60 Hz. After the driving frequency of the display device reaches the target driving frequency, the display device may be continuously driven at the target driving frequency.
Referring to
In the hold frame, the static image display area may maintain an image displayed in the static image display area in a preceding frame, rather than being refreshed. The driving controller 140 of
In the hold frame, the video display area may be refreshed two times. In an embodiment, the k-th frame set to the hold frame may include a first sub-frame and a second sub-frame. The driving controller 140 of
Referring to
Referring to
At a second step 2nd step, the video display area may be driven at a driving frequency of 120 Hz, and the static image display area may be driven at a driving frequency of 60 Hz. To this end, at the second step 2nd step, 60 frames among 120 frames 121F to 240F may be set to hold frames. In this case, one of every two frames among the 120 frames may be set to a hold frame. In other words, among the 120 frames at the second step 2nd step, frames such as a 122th frame 122F, a 124th frame 124F, a 236th frame 236F, a 238th frame 238F, and a 240th frame 240F, corresponding to the multiples of 2 may be set to hold frames. In the hold frame, the static image display area may maintain an image displayed in the static image display area in a preceding frame, rather than being refreshed. Therefore, the static image display area may be driven at a driving frequency of 60 Hz. The video display area may be refreshed once every frame for a second.
At a third step 3rd step, the video display area may be driven at a driving frequency of 150 Hz, and the static image display area may be driven at a driving frequency of 60 Hz. To this end, at the third step 3rd step, 60 frames among 120 frames 241F to 360F may be set to hold frames. In this case, one of every two frames among the 120 frames 241F to 360F may be set to a hold frame. In other words, among the 120 frames at the third step 3rd step, frames such as a 242th frame 242F, a 244th frame 244F, a 356th frame 356F, a 358th frame 358F, and a 360th frame 360F, corresponding to the multiples of 2 may be set to hold frames.
Furthermore, in 30 hold frames corresponding to a half of the 60 hold frames set at the third step 3rd step, the video display area may be refreshed two times. In other words, in frames such as the 244th frame 244F, a 248th frame (not illustrated), the 356th frame 356F, and the 360th frame 360F, corresponding to the multiples of 4, among the 120 frames 241F to 360F at the third step 3rd step, the static image display area may not be refreshed, and the video display area may be refreshed two times. Because 60 frames among the 120 frames 241F to 360F at the third step 3rd step are set to hold frames and the video display area is refreshed two times in 30 hold frames among the 60 frames, the static image display area may be driven at a driving frequency of 60 Hz, and the video display area may be driven at a driving frequency of 150 Hz.
At a fourth step 4th step, the video display area may be driven at a driving frequency of 180 Hz, and the static image display area may be driven at a driving frequency of 60 Hz. To this end, at the fourth step 4th step, 60 frames among 120 frames 361F to 480F may be set to hold frames. In this case, one of every two frames among the 120 frames 361F to 480F may be set to a hold frame. In other words, among the 120 frames 361F to 480F at the fourth step 4th step, frames such as a 362th frame 362F, a 364th frame 364F, a 476th frame 476F, a 478th frame 478F, and a 480th frame 480F, corresponding to the multiples of 2 may be set to hold frames.
Furthermore, in the 60 hold frames set at the fourth step 4th step, the video display area may be refreshed two times. In other words, in frames such as the 362th frame 362F, the 364th frame 364F, the 476th frame 476F, the 478th frame 478F, and the 480th frame 480F, corresponding to the multiples of 2, among the 120 frames 361F to 480F at the fourth step 4th step, the static image display area may not be refreshed, and the video display area may be refreshed two times. Because 60 frames among the 120 frames 361F to 480F at the fourth step 4th step are set to hold frames and the video display area is refreshed two times in all of the 60 hold frames, the static image display area may be driven at a driving frequency of 60 Hz, and the video display area may be driven at a driving frequency of 180 Hz.
Because at the fourth step 4th step the driving frequency of the display device has reached the target frequency, the display device may be continuously driven at the target frequency since a subsequent frame (e.g., a 481th frame).
The number of hold frames set at each step may be set to a value different from that of the embodiment described with reference to
A pattern in which hold frames among a plurality of frames are set may be changed in various ways rather than being limited to the embodiments of the present disclosure. The pattern in which the hold frames are set may be stored in a separate register (not illustrated) provided in the display device.
Referring to
In the case where data corresponding to a static image is included in image data that is received from an external device and corresponds to a plurality of frames, the driving controller 140 may divide a display area included in the pixel component 110 into a static image display area in which the static image is displayed and a video display area in which a video is displayed. The driving controller 140 may control the scan driver 120, the data driver 130, and the pixel component 110 such that pixels included in the static image display area are driven at the second driving frequency less than the first driving frequency, and pixels included in the video display area is driven at the third driving frequency greater than the first driving frequency.
In detail, the static image detector 141 may check whether data corresponding to the static image is included in the image data. In the case where the data corresponding to the static image is included in the image data, the static image detector 141 may check whether a static image and a video are simultaneously displayed. In the case where the static image and the video are simultaneously displayed, the static image detector 141 may generate region information reg_info about regions occupied by the static image display area and the video display area in the pixel component 110. The generated region information reg_info along with the image data may be provided to the frequency determiner 142.
The frequency determiner 142 may determine the driving frequencies of the static image display area and the video display area, based both on whether data corresponding to the static image is included in the image data and on the region information reg_info received from the static image determiner 141. In the case where data corresponding to the static image is not included in the image data, the frequency determiner 142 may determine a driving frequency corresponding to the entirety of the display area to be the first driving frequency. In the case where data corresponding to the static image is included in the image data, the frequency determiner 142 may determine a driving frequency corresponding to the static image display area in the display area to be the second driving frequency lower than the first driving frequency, and may determine a driving frequency corresponding to the video display area to be the third driving frequency higher than the first driving frequency. The frequency determiner 142 may provide frequency information frq_info including information about the determined driving frequencies of the static image display area and the video display area to the hold frame determiner 143.
In the case where data corresponding to the static image is included in the image data, the hold frame determiner 143 may determine some of a plurality of frames to be hold frames, based on the determined frequency information frq_info. The hold frame may be a frame in which the static image display area maintains an image displayed in a preceding frame without being refreshed.
The driving controller 140 may control the scan driver 120, the data driver 130, and the pixel component 110 such that the driving frequency corresponding to the static image display area is gradually reduced from the first driving frequency to the second driving frequency over a first time period, and the driving frequency corresponding to the video image display area is gradually increased from the first driving frequency to the third driving frequency over a second time period. The first driving frequency may be reduced to the second driving frequency over a plurality of steps, as described with reference to
Although not illustrated in
In an embodiment, the driving controller 140 may provide the data driving control signal DCS and the image data to the data driver 130. The driving controller 140 may provide, to the scan driver 120, the scan driving control signal SCS for controlling the scan driver 120.
Image data received from an external device may correspond to a plurality of frames. Referring to
In
Because the first, third, and fifth frames among the first to sixth frames are not set to hold frames, the first to n-th scan signals SC1 to SCn may be respectively sequentially provided to the pixel rows. In synchronization with the scan signals provided to the respective pixel rows, data signals DATA1, DATA3, and DATA6 may be provided to the pixels included in the pixel rows.
Each of the hold frames may include a refresh section in which the video display area is refreshed, and a hold section in which an image displayed in the static image display area in a preceding frame is maintained. In the refresh section, scan signals may be sequentially provided to the pixel rows corresponding to only the video display area among the static image display area and the video display area.
In detail, the second frame, the 4-1-th and 4-2-th frames, the sixth frame among the first to sixth frames may be set to hold frames. The 4-1-th frame and the 4-2-th frame may form one hold frame. Because the second, 4-1-th, 4-2-th, and sixth frames are set to hold frames, scan signals SCi to SCn may not be provided to the pixels corresponding to the static image display area when each frame is displayed in the display area.
Furthermore, because the second, 4-1-th, 4-2-th, and sixth frames are set to hold frames, data signals DATA2, DATA4, DATA5, and DATA 7 of the second, 4-1-th, 4-2-th, and sixth frames may not include signals for data corresponding to the static image display area. In other words, in the case of the second, 4-1-th, 4-2-th, and sixth frames, a data voltage may not be provided to the pixels included in the static image display area.
In
Therefore, the scan driver 120 of
The length of time for which each of the 4-1-th frame and the 4-2-th frame is displayed may be less than the length of time for which each of the remaining frames other than the 4-1-th frame and the 4-2-th frame among the first to sixth frames is displayed.
In an embodiment, the display device may be configured such that, in a first mode for further reducing the power consumption, some of the remaining frames other than the already set hold frames among the plurality of frames may be set to additional hold frames. Hence, the driving frequency corresponding to the static image display area may be further reduced, so that the power consumption can be reduced.
Furthermore, in the display device, in a second mode for high speed driving, the refresh section and the hold section included in at least one hold frame among the hold frames added in the first mode may be respectively allocated to a first sub-frame and a second sub-frame, so that the driving frequency corresponding to the video display area can be further increased, whereby the video display area can be driven at a higher speed.
In detail, referring to
Referring to
At step S1203, the display device may determine whether the image data received from the external processor includes data corresponding to a static image Here, in the case where the image data does not include data corresponding to a static image, the display device may be determined to be driven at the first driving frequency (at step S1205).
At step S1207, in the case where the image data includes data corresponding to a static image, the display device may determine whether a static image and a video are simultaneously displayed in the display area. Here, in the case where the static image and the video are not simultaneously displayed in the display area, the display device may be determined to be driven at the first driving frequency (at step S1205).
At step S1209, in the case where the static image and the video are simultaneously displayed, the display area may be divided into a first area in which the static image is displayed and a second area in which the video are displayed.
At step S1211, the display device may determine a driving frequency corresponding to the first area to be the second driving frequency lower than the first driving frequency, and may determine a driving frequency corresponding to the second area to be the third driving frequency higher than the first driving frequency.
At step S1213, the display device may set at least one frame among a plurality of frames to a hold frame in which an image displayed in the first area in a preceding frame is maintained.
At step S1215, the display device may control the scan driver 120, the data driver, and the pixel component 110 such that the driving frequency of the first area is gradually reduced from the first driving frequency to the second driving frequency over a first time period, and the driving frequency of the second area is gradually increased from the first driving frequency to the third driving frequency over a second time period.
A display device in accordance with an embodiment of the present disclosure may provide a high-quality image to a user with low power consumption.
While the present disclosure has been described with reference to embodiments thereof, it will be apparent to those of ordinary skill in the art that various changes and modifications may be made thereto without departing from the scope and spirit of the present disclosure as set forth in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0140689 | Oct 2022 | KR | national |
