Display device and method for driving the same

Abstract

A display device and a method for driving the display device are provided. The display device includes: an image determiner configured to determine whether to display a still image by comparing a first portion of image data as a portion of image data of a previous frame with a second portion of image data as a portion of image data of a current frame at a first moment in a first mode for displaying a non-moving image, and to determine whether to display a still image by comparing a first frame data as the entire image data of a previous frame with a second frame data as the entire image data of a current frame at a second moment in a second mode for displaying a moving image; a display panel including pixels receiving data signals corresponding to the image data; and a panel driver configured to change a frequency of driving the pixels according to the first mode and the second mode.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0018072 filed on February 15, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Technical Field

[0002] The present inventive concept relates to an electronic device, and more particularly, to a display device and a method for driving the display device. Background Art

[0003] The display device displays an image on a display panel in response to a control signal applied from outside the display device.

[0004] The display device includes a plurality of pixels. Each of the pixels includes a plurality of transistors and a light emitting device and a capacitor electrically coupled to the transistors. The transistors are respectively turned on in response to a signal provided through a gate line or a scan line to generate a driving current. The light emitting device emits light corresponding to the driving current generated by the transistor.

[0005] In order to improve the driving efficiency of the display device, the display device should consume low power. The power consumption of the display device can be reduced by reducing the driving frequency in the still image display. Summary of the invention

[0006] According to an exemplary embodiment of the present invention, there is provided a display device including: an image determiner configured to receive image data in frames, determine whether to display a still image by comparing a first portion of image data as a portion of image data of a previous frame with a second portion of image data as a portion of image data of a current frame at a first moment in a first mode for displaying a non-moving image, and determine whether to display a still image by comparing a first frame of data as all image data of a previous frame with a second frame of data as all image data of a current frame at a second moment in a second mode for displaying a moving image; a display panel including pixels receiving data signals corresponding to the image data received by the image determiner; and a panel driver configured to change a frequency of driving the pixels according to the first mode and the second mode.

[0007] The display panel may include n (n is a positive integer) pixel lines. The first portion of the image data and the second portion of the image data may correspond to the first pixel line to the kth pixel line (k is a positive integer less than n).

[0008] The first portion of image data and the second portion of image data may correspond to a first line of pixels.

[0009] The display panel may include n (n is a positive integer) pixels. The first portion of image data and the second portion of image data may correspond to first to k-th pixels (k is a positive integer less than n).

[0010] When the first partial image data and the second partial image data are different from each other in the first mode, the image determiner may switch the first mode to the second mode, and the panel driver may delay the second frame data by a predetermined time.

[0011] The panel driver may increase an output frequency of at least some of the plurality of scan signals applied to each of the pixels in the second mode.

[0012] The time when the second mode is activated and the start time when the image corresponding to the second frame data is displayed may be synchronized with each other.

[0013] When the first partial image data and the second partial image data are equal to each other in the first mode, the image determiner may determine whether to display the still image by comparing the first frame data with the second frame data at a second time in the first mode.

[0014] When the first frame data and the second frame data are different from each other in the first mode, the image determiner may switch the first mode to the second mode.

[0015] The first time instant may correspond to a time instant at which the second portion of image data in the current frame is provided to the image determiner.

[0016] The second time may correspond to a time when all of the second frame data is provided to the image determiner.

[0017] The image determiner may include: a checksum accumulator configured to accumulate a checksum of image data of a current frame; a memory configured to store a checksum of image data of a previous frame; a comparator configured to compare the checksum of a first portion of image data with the checksum of a second portion of image data at a first moment in a first mode, and to compare the checksum of the first frame data with the checksum of the second frame data at a second moment in the first mode and at a second moment in the second mode; and a mode controller configured to output a still image flag for determining activation of the first mode or the second mode based on the comparison result.

[0018] The panel driver may be driven in a first mode in response to an activation level of the still picture flag, and may be driven in a second mode in response to an inactivation level of the still picture flag.

[0019] The panel driver may include: a data driver configured to convert image data into a data signal and provide the data signal to the display panel; a scan driver configured to provide a scan signal to the display panel at a first frequency in a first mode and to provide the scan signal to the display panel at a second frequency higher than the first frequency in a second mode; and a display delayer configured to delay the supply of the second frame data to the data driver for a predetermined time in response to a comparison result of the first portion of the image data and the second portion of the image data.

[0020] The display delayer may include a line buffer configured to receive the image data and provide the image data to the data driver.

[0021] According to another exemplary embodiment of the present invention, there is provided a method for driving a display device, the method comprising: in a first mode for displaying a still image, comparing a first portion of image data which is a portion of image data of a previous frame with a second portion of image data which is a portion of image data of a current frame at a first moment of a current frame; when the first portion of image data and the second portion of image data are different from each other, switching the first mode to a second mode for displaying a moving image, and delaying an image to be displayed for a predetermined time, wherein the image to be displayed corresponds to the current frame; and increasing the frequency of some scanning signals applied to pixels in the second mode.

[0022] The method may also include: when the first portion of the image data and the second portion of the image data are equal to each other, comparing the first frame data as the entire image data of the previous frame with the second frame data as the entire image data of the current frame at a second moment of the current frame; when the first frame data and the second frame data are different from each other, displaying the image of the next frame by switching the first mode to the second mode; and when the first frame data and the second frame data are equal to each other, maintaining the first mode.

[0023] The first time may be a time until data of the second partial image data is received, and the second time may be a time when all of the second frame data is received.

[0024] The method may also include: comparing first frame data, which is all image data of a previous frame, with second frame data, which is all image data of a current frame, at a second moment in the second mode; when the first frame data and the second frame data are different from each other, maintaining the second mode; and when the first frame data and the second frame data are equal to each other, switching the second mode to the first mode and reducing the frequency of at least some scanning signals.

[0025] The display panel for displaying an image may include n (n is a positive integer) pixel lines. The first portion of image data and the second portion of image data may correspond to the first pixel line to the kth pixel line (k is a positive integer less than n).

[0026] According to an exemplary embodiment of the inventive concept, a display device is provided, which includes: a display panel including pixels; an image determiner configured to: in a first mode for displaying a still image, compare a first portion of image data of a previous frame with a second portion of image data of a current frame at a first moment of a current frame; switch the first mode to a second mode for displaying a moving image when the first portion of image data and the second portion of image data are different from each other, and delay an image to be displayed of the current frame for a predetermined time; and a driver configured to increase the frequency of a first scanning signal applied to the pixel in the second mode.

[0027] When the first partial image data and the second partial image data are different from each other, the frequency of the first scanning signal increases.

[0028] The predetermined time is a period from the time when the supply of the image data of the current frame starts to the first time.

[0029] According to an exemplary embodiment of the inventive concept, a display device is provided, which includes: a display panel including pixels; an image determiner configured to determine whether to display a still image by comparing a first portion of image data of a previous frame with a second portion of image data of a current frame at a first moment in a first mode for displaying a non-moving image, and to determine whether to display a still image by comparing a first frame data including all image data of a previous frame with a second frame data including all image data of a current frame at a second moment in a second mode for displaying a moving image; and a driver configured to change a frequency of driving the pixels according to the first mode and the second mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features of the inventive concept will become more apparent by describing in detail exemplary embodiments of the inventive concept with reference to the attached drawings.

[0031] Figure 1 is a block diagram illustrating a display device according to an exemplary embodiment of the inventive concept.

[0032] Figure 2 is a diagram showing an exemplary embodiment according to the inventive concept including Figure 1 A circuit diagram of a pixel in a display device is shown in FIG.

[0033] Figure 3 The driving example according to the exemplary embodiment of the inventive concept is shown Figure 1 FIG. 4 is a diagram of a display device shown in FIG.

[0034] Figure 4 The driving example according to the exemplary embodiment of the inventive concept is shown Figure 1 FIG. 4 is a diagram of a display device shown in FIG.

[0035] Figure 5 is a diagram showing an exemplary embodiment according to the inventive concept including Figure 1 A block diagram of an image determiner in a display device is shown in FIG.

[0036] Figure 6 is a diagram showing an exemplary embodiment according to the inventive concept Figure 5 FIG. 5 is a diagram showing an image determiner performing driving of a display device.

[0037] Figure 7 is a diagram showing an exemplary embodiment according to the inventive concept Figure 5 FIG. 5 is a diagram showing an image determiner performing driving of a display device.

[0038] Figure 8 is a diagram showing an exemplary embodiment according to the inventive concept including Figure 1 0 is a block diagram of a portion of another exemplary embodiment of a panel driver in a display device shown in FIG.

[0039] Fig. 9 is a diagram showing an exemplary embodiment according to the inventive concept including Figure 8 FIG. 4 is a diagram of a display delay device in a panel driver shown in FIG.

[0040] Fig.10 is a flowchart illustrating a method for driving a display device according to an exemplary embodiment of the inventive concept.

[0041] Fig.11 is a diagram showing an exemplary embodiment according to the inventive concept Fig.10 Flowchart of the method of operation in the second mode is shown in FIG. DETAILED DESCRIPTION

[0042] Hereinafter, exemplary embodiments of the inventive concept will be described in more detail with reference to the accompanying drawings. However, the inventive concept may be implemented in different forms and should not be construed as limited to the embodiments set forth herein.

[0043] In all the drawings, the same reference numerals may be assigned to the same elements, and their repeated description may be omitted. In the drawings, the sizes may be exaggerated for clarity of illustration.

[0044] It will be understood that when an element is referred to as being “between” two elements, it can be the only element between the two elements, or one or more intervening elements may also be present.

[0045] Figure 1 is a block diagram illustrating a display device 1000 according to an exemplary embodiment of the inventive concept.

[0046] Reference Figure 1 , the display device 1000 may include a display panel 100 , an image determiner 200 , and a panel driver 300 .

[0047] In an exemplary embodiment of the inventive concept, the driving mode of the display device 1000 may be a low-power driving mode (or a low-frequency driving mode) (hereinafter, referred to as a first mode) and a normal driving mode (hereinafter, referred to as a second mode). The display device 1000 operates in the first mode or the second mode. The second mode is a driving mode in which the display panel 100 normally displays input image data. For example, a moving image may be displayed in the second mode.

[0048] The first mode is a mode in which the display device 1000 displays a still image. For example, when the display device 1000 is in a standby state, the display device 1000 may be driven in the first mode. The first mode may include a mode in which basic display information is always displayed (eg, an always on display (AOD) mode).

[0049] The display panel 100 may include a plurality of scan lines SL1 to SLn, a plurality of emission control lines EL1 to ELn, and a plurality of data lines DL1 to DLm. The display panel 100 may include a plurality of pixels PX (n and m are integers greater than 1) respectively coupled to the scan lines SL1 to SLn, the emission control lines EL1 to ELn, and the data lines DL1 to DLm. Therefore, the display panel 100 may include n×m pixels PX. Each of the pixels PX may include a driving transistor and a plurality of switching transistors.

[0050] The pixels PX may be divided into pixel lines or pixel rows corresponding to the scan lines SL1 to SLn, respectively. For example, the display panel 100 may include n pixel lines.

[0051] Furthermore, in exemplary embodiments of the inventive concept, different scan lines for supplying scan signals having different timings may be coupled to one pixel PX (and one pixel line).

[0052] The image determiner 200 may receive image data IDATA provided in units of frames. The image determiner 200 may determine whether to display a still image by analyzing the image data IDATA. The image determiner 200 may provide a still image flag S_FLAG corresponding to the image determination result for changing the driving mode to the panel driver 300.

[0053] In an exemplary embodiment of the inventive concept, image data IDATA respectively corresponding to pixels PX from pixels PX coupled to the first data line DL1 and the first scan line SL1 to pixels PX coupled to the mth data line DLm and the nth scan line SLn may be supplied as serial data to the display device 1000. For example, the image data IDATA may be serially supplied to the image determiner 200 and the timing controller 320. The image determiner 200 may analyze the image data IDATA as serial data.

[0054] In an exemplary embodiment of the inventive concept, in the first mode, the image determiner 200 may determine whether to display a still image by comparing first partial image data with second partial image data at a first moment of the current frame. The first partial image data is a portion of image data IDATA of a previous frame, and the second partial image data is a portion of image data IDATA of the current frame corresponding to the first partial image data.

[0055] In an exemplary embodiment of the inventive concept, the first partial image data and the second partial image data may be data corresponding to the first pixel line to the kth pixel line (k is a positive integer less than n). The first time may correspond to the time when the data of the kth pixel line is provided to the image determiner 200.

[0056] In an exemplary embodiment of the inventive concept, the first portion of image data and the second portion of image data may correspond to the first pixel to the k-th pixel. The first pixel to the k-th pixel may be pixels corresponding to a sequence of the image data IDATA provided in series. For example, each of the first portion of image data and the second portion of image data may be image data of 2000 pixels. The first moment may correspond to the moment when the data of the 2000th pixel is provided to the image determiner 200.

[0057] When the first portion of image data and the second portion of image data are different from each other, the image determiner 200 may determine that the image of the current frame is different from the image of the previous frame. For example, the image of the current frame may be a moving image (or an image that is scrolling). Therefore, the driving mode of the display device 1000 may be immediately switched from the first mode to the second mode.

[0058] In an exemplary embodiment of the inventive concept, when the first partial image data and the second partial image data are equal to each other in the first mode, the image determiner 200 may determine again whether to display a still image by comparing the first frame data with the second frame data at a second moment of the current frame, the first frame data being the entire image data of the previous frame, and the second frame data being the entire image data of the current frame. For example, the second moment may correspond to a moment when the entire image data of the current frame is provided to the image determiner 200. For example, the second moment may be a moment when the entire second frame data is provided.

[0059] When the first frame data and the second frame data are equal to each other, the first mode may be maintained. When the first frame data and the second frame data are different from each other, the driving mode of the display device 1000 may be switched to the second mode.

[0060] In an exemplary embodiment of the inventive concept, in the second mode, the image determiner 200 may determine whether to display a still image by comparing the first frame data with the second frame data at a second moment of the current frame. When the first frame data and the second frame data are equal to each other, the driving mode of the display device 1000 may be switched to the first mode. When the first frame data and the second frame data are different from each other, the second mode may be maintained.

[0061] In an exemplary embodiment of the inventive concept, the image determining operation of the image determiner 200 may be performed for each frame. However, this is merely illustrative, and the image determining operation may be performed in units of predetermined frames.

[0062] The panel driver 300 may change the frequency of driving the pixel PX according to the first mode and the second mode. For example, in the first mode of displaying a still image, the output frequency of some scan signals may be reduced to reduce power consumption. In an exemplary embodiment of the inventive concept, the panel driver 300 may include a timing controller 320, a scan driver 340, an emission driver 360, and a data driver 380.

[0063] The timing controller 320 may control driving of the scan driver 340, the emission driver 360, and the data driver 380 based on a timing signal supplied from the outside. In addition, the timing controller 320 may provide the data driver 380 with image data IDATA supplied from an external graphic source.

[0064] The timing controller 320 may supply a first control signal SCS including a scan start signal, a scan clock signal, etc. to the scan driver 340, and supply a second control signal ECS including an emission control start signal, an emission control clock signal, etc. to the emission driver 360. The timing controller 320 may supply a third control signal DCS including a source start signal, a source output enable signal, a source sampling clock, etc. to the data driver 380.

[0065] In an exemplary embodiment of the inventive concept, the timing controller 320 may control the output frequency of the scan signal according to the driving mode of the display device 1000. For example, the output frequency of the scan start signal in the first mode may be smaller than the output frequency of the scan start signal in the second mode. Therefore, the power consumption in the first mode in which a still image is displayed may be reduced. However, this is merely illustrative, and the method for reducing the driving frequency in the first mode is not limited thereto.

[0066] The scan driver 340 may supply scan signals to the scan lines SL1 to SLn in response to the first control signal SCS. In an exemplary embodiment of the inventive concept, the scan driver 340 may output a plurality of scan signals to one pixel PX. For example, different scan signals may be output to scan lines coupled to different components in the pixel PX. A plurality of different lines for corresponding scan signals may be coupled to the pixel PX.

[0067] The emission driver 360 may supply emission control signals to the pixels PX through the emission control lines EL1 to ELn based on the second control signal ECS.

[0068] The data driver 380 may receive the third control signal DCS and the image data signal RGB from the timing controller 320. The data driver 380 may convert the image data signal RGB into analog data signals (eg, data voltages) and provide the data signals to the display panel 100 through the data lines DL1 to DLm.

[0069] Despite Figure 1 The image determiner 200, the scan driver 340, the emission driver 360, the data driver 380, and the timing controller 320 shown in FIG. 1 are components separated from each other, but at least some of these components may be physically and / or functionally integrated.

[0070] In addition, the display device 1000 may further include a power supply configured to supply a first power VDD, a second power VSS, and a third power VINT to the display panel 100. However, this is merely illustrative, and at least one of the first power VDD, the second power VSS, and the third power VINT may be supplied from the timing controller 320 or the data driver 380.

[0071] Figure 2 It is shown that the Figure 1 1 is a circuit diagram of one of the pixels PX in the display device 1000 shown in FIG.

[0072] Reference Figure 1 and Figure 2 , the pixel PX1 may include a light emitting device LED and a plurality of transistors T1 , T2 , T3 , T4 , T5 , T6 , and T7 .

[0073] Figure 2 The pixel PX1 shown in is a pixel disposed on the j-th row and the i-th column (i and j are positive integers).

[0074] The first electrode of the light emitting device LED may be connected to the sixth transistor T6, and the second electrode of the light emitting device LED may be coupled to the second power supply VSS. The light emitting device LED may include an organic light emitting diode or an inorganic light emitting diode. The light emitting device LED may generate light having a predetermined brightness corresponding to the driving current supplied from the first transistor T1.

[0075] The first transistor T1 may be coupled between a first node N1 electrically coupled to a first power source VDD and a second node N2 electrically coupled to a first electrode of the light emitting device LED. The first transistor T1 may generate a driving current and provide the driving current to the light emitting device LED. A gate electrode of the first transistor T1 may be coupled to a third node N3. The first transistor T1 may be a driving transistor of the pixel PX1.

[0076] The second transistor T2 may be coupled between the data line and the first node N1. The second transistor T2 may include a gate electrode for receiving the write scan signal GW(j).

[0077] The third transistor T3 may be coupled between the second node N2 and the third node N3. The third transistor T3 may include a gate electrode for receiving the compensation scan signal GC(j). When the third transistor T3 is turned on, the first transistor T1 may be diode-coupled. In other words, the third transistor T3 may play a role in writing the data voltage VDATA relative to the first transistor T1 and compensating for the threshold voltage of the first transistor T1.

[0078] The storage capacitor Cst may be coupled between the first power source VDD and the third node N3. The storage capacitor Cst may store a voltage corresponding to the data voltage VDATA and a threshold voltage of the first transistor T1.

[0079] The fourth transistor T4 may be coupled between the third node N3 and the third power supply VINT. The fourth transistor T4 may include a gate electrode for receiving an initialization scan signal GI(j). In an exemplary embodiment of the inventive concept, the initialization scan signal GI(j) may correspond to a compensation scan signal GC(j-1) of a previous pixel line. When the fourth transistor T4 is turned on, a gate voltage of the first transistor T1 may be initialized to a voltage of the third power supply VINT. In an exemplary embodiment of the inventive concept, the third power supply VINT may be set to a voltage lower than a lowest voltage of the data voltage VDATA.

[0080] The fifth transistor T5 may be coupled between the first power source VDD and the first node N1. The fifth transistor T5 may include a gate electrode for receiving the emission control signal EM(j).

[0081] The sixth transistor T6 may be coupled between the second node N2 and the first electrode of the light emitting device LED. The sixth transistor T6 may include a gate electrode for receiving the emission control signal EM(j).

[0082] The fifth transistor T5 and the sixth transistor T6 may be turned on in a gate-on period of the emission control signal EM(j), and may be turned off in a gate-off period of the emission control signal EM(j).

[0083] The seventh transistor T7 may be coupled between the third power supply VINT and the first electrode of the light emitting device LED. The seventh transistor T7 may include a gate electrode for receiving a bypass scan signal GB(j). In an exemplary embodiment of the inventive concept, the bypass scan signal GB(j) may correspond to the write scan signal GW(j). However, this is merely illustrative, and the bypass scan signal GB(j) may correspond to the write scan signal GW(j-1) supplied to the previous pixel row or the write scan signal GW(j+1) supplied to the next pixel row.

[0084] It should be understood that the write scan signal GW(j), the compensation scan signal GC(j), the initialization scan signal GI(j) and the bypass scan signal GB(j) are expressions used to distinguish the scan signals provided to different components in the pixel PX1 for the convenience of description, and therefore do not limit the functions of the individual scan signals.

[0085] In an exemplary embodiment of the inventive concept, each of the first transistor T1, the second transistor T2, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 may be implemented with a P-type low temperature polysilicon (LTPS) thin film transistor, and the third transistor T3 and the fourth transistor T4 may be implemented with an N-type oxide semiconductor thin film transistor. Since the N-type oxide semiconductor thin film transistor has excellent current leakage characteristics compared with the P-type LTPS thin film transistor, the third transistor T3 and the fourth transistor T4, which may be used as a switch transistor, may be implemented with an N-type oxide semiconductor thin film transistor.

[0086] Therefore, leakage current in the third transistor T3 and the fourth transistor T4 can be significantly reduced, and pixel driving and image display can be performed at a low frequency of less than 30 Hz. In other words, power consumption can be reduced in the first mode.

[0087] Figure 3 The driving example according to the exemplary embodiment of the inventive concept is shown Figure 1 FIG. 1 is a diagram of a display device 1000 shown in FIG.

[0088] Reference Figures 1 to 3 , the display device 1000 may operate in a first mode in which a still image is displayed.

[0089] Figure 3 FIG. 4 shows a case where the pixel PX1 included in the j-th row is driven in the first mode MODE1. Figure 3 As shown in FIG. 1 , in the first mode MODE1 , the display device 1000 may operate by repeating a first cycle C1 including a first period P1 corresponding to one frame period and a second period P2 including a plurality of consecutive frame periods.

[0090] The first period P1 may include a data writing period WP and an emission period EP. Each frame period of the second period P2 may include a bias period BP and an emission period EP.

[0091] The data write period WP may be a period in which the second transistor T2 and the third transistor T3 are turned on so that the data voltage VDATA is stored in the storage capacitor Cst. The bias period BP may be a period in which only the second transistor T2 is turned on to supply a predetermined voltage (or the data voltage VDATA of the corresponding frame) to the source electrode of the first transistor T1. In this case, the on bias state of the first transistor T1 is maintained. Therefore, it will be understood that the first period P1 is a write period and the second period P2 is a hold period.

[0092] In the first mode MODE1, the first pixel PX1 may emit light having a grayscale corresponding to the data voltage VDATA written in the data writing period WP during the first cycle C1. For example, the first cycle C1 may be set to 60 Hz and include 60 frame periods. The second period P2 may have 59 frame periods. In other words, based on the data voltage VDATA written in the data writing period WP of one frame period, the pixel PX1 may emit light during 60 frame periods.

[0093] In an exemplary embodiment of the inventive concept, in the second period P2, only the write scan signal GW(j) is applied, and other scan signals GC(j), GI(j) and GB(j) are not supplied. For example, their levels are kept stable. Therefore, the power used to supply the scan signal is not consumed. For example, when the first cycle C1 is set to 60Hz, the compensation scan signal GC(j), the initialization scan signal GI(j) and the bypass scan signal GB(j) can be output at 1Hz in the first mode MODE1. Therefore, the drive for outputting the compensation scan signal GC(j), the initialization scan signal GI(j) and the bypass scan signal GB(j) can also be performed at 1Hz. However, this is only illustrative, and the compensation scan signal GC(j), the initialization scan signal GI(j) and the bypass scan signal GB(j) can be output at a low frequency of 20Hz or less.

[0094] The gate-on level of each of the write scan signal GW(j), the compensation scan signal GC(j), the initialization scan signal GI(j), and the bypass scan signal GB(j) may correspond to the type of transistor to which they are applied. In other words, the gate-on level of the scan signal supplied to the P-type transistor may be a logic low level, and the gate-on level of the scan signal supplied to the N-type transistor may be a logic high level.

[0095] In addition, in the second mode in which a moving image is displayed, all of the write scan signal GW(j), the compensation scan signal GC(j), the initialization scan signal GI(j), and the bypass scan signal GB(j) may be output at the same frequency. For example, when an image is displayed at 60 Hz, the write scan signal GW(j), the compensation scan signal GC(j), the initialization scan signal GI(j), and the bypass scan signal GB(j) may be output at 60 Hz.

[0096] However, this is merely illustrative, and the low-frequency driving method in the first mode MODE1 for reducing power consumption and the pixel configuration corresponding thereto are not limited thereto. For example, the low-frequency driving method for displaying a still image can be implemented by various methods.

[0097] Figure 4 The driving example according to the exemplary embodiment of the inventive concept is shown Figure 1 FIG. 1 is a diagram of a display device 1000 shown in FIG.

[0098] Reference Figure 1 and Figure 4 , the display device 1000 may be driven in the first mode MODE1 or the second mode MODE2. Figure 4 , the display device 1000 is provided with image data DATA INPUT corresponding to image A, image B, image C, and image D, and the display device 1000 outputs, for example, image A to image D.

[0099] In an exemplary embodiment of the inventive concept, the panel driver 300 and the display device 1000 may be driven in a first mode MODE1 in response to an activation level of the still image flag S_FLAG, and may be driven in a second mode MODE2 in response to an inactivation level of the still image flag S_FLAG. Figure 4 As shown in , the activation level of the still image flag S_FLAG can be a logic high level, and the inactivation level of the still image flag S_FLAG can be a logic low level. However, this is only illustrative, and the activation level / inactivation level of the still image flag S_FLAG is not limited thereto. For example, the activation level of the still image flag S_FLAG can be a logic low level.

[0100] In an exemplary embodiment of the inventive concept, the image data IDATA of a frame unit may be supplied from an external graphic source to the image determiner 200 and the panel driver 300. Thus, an image corresponding to the image data IDATA may be displayed.

[0101] In the second mode MODE2, still image determination may be performed at a second time t2 when all image data IDATA of one frame is supplied. In an exemplary embodiment of the inventive concept, first frame data as the entire image data of the previous frame may be compared with second frame data as the entire image data of the current frame at the second time t2. For example, a checksum of the first frame data may be compared with a checksum of the second frame data. The first frame data or the checksum of the first frame data may be temporarily stored in a memory, a register, or the like. The stored first frame data or the checksum of the stored first frame data may be loaded at a second time t2 of the current frame to compare the stored first frame data or the checksum of the stored first frame data with the second frame data or the checksum of the second frame data.

[0102] When the first frame data and the second frame data are different from each other, the second mode MODE2 may be maintained. In other words, the display image is changed for each frame.

[0103] When the first frame data and the second frame data are equal to each other, the still image flag S_FLAG may be changed to an active level, and the display device 1000 may be driven in the first mode MODE1. For example, the frequency of some scan signals output from the panel driver 300 may be reduced.

[0104] In the first mode MODE1, still image determination can be performed at the first time t1 when partial image data of one frame is supplied. For example, the checksum of the first partial image data can be compared with the checksum of the second partial image data. The checksum of the first partial image data can be temporarily stored in a memory, a register, etc.

[0105] When the first partial image data and the second partial image data are equal to each other, the still image determination can be performed again at the second time t2. In other words, when the same image is displayed in adjacent frames, the drive for still image determination can be performed at least twice in one frame of the first mode MODE1.

[0106] In an exemplary embodiment of the inventive concept, the first moment t1 may be a moment at which image data corresponding to the k-th pixel line is provided. Therefore, each of the first portion of image data and the second portion of image data may include image data of the first pixel line to the k-th pixel line. The moment at which the drive mode of the display device 1000 is changed may become faster as k becomes smaller. For example, when k is 1, the image determiner 200 may compare only the image data of the first pixel line. When the entire image including the image being scrolled is changed, it may be determined whether a moving image is displayed by comparing only the first pixel line. Therefore, since only the first pixel line is compared, the drive mode of the display device 1000 may be quickly switched from the first mode MODE1 to the second mode MODE2.

[0107] When the first partial image data and the second partial image data are different from each other, the still image flag S_FLAG may be changed to an inactive level, and the display device 1000 may be driven in the second mode MODE2. In other words, the display device 1000 may be changed from the first mode MODE1 to the second mode MODE2. The image output may be delayed by a predetermined delay time DT to display the changed image. For example, the delay time DT may be a period from the moment when the supply of the image data of one frame starts to the first moment t1. For example, as Figure 4 As shown in , the delay time DT may start when there is a data input (DATAINPUT) corresponding to "C" and may end at the first time t1. Therefore, as the compared image data becomes smaller, the delay time DT may become shorter, and the construction of a buffer, a register, etc. for delaying image output may be simplified.

[0108] In the existing low-frequency driving mode, whether to display a moving image / still image is determined by comparing the entire image data IDATA between adjacent frames. When the driving mode of the display device 1000 is switched from the low-frequency mode (e.g., the first mode MODE1) to the second mode MODE2, a time difference or inconsistency between the image data IDATA input to the display device 1000 and the image displayed in the display device 1000 may occur, or a frame may disappear (e.g., Figure 4 (The image C shown in FIG. 1 disappears). Therefore, there may be an error in touch recognition or a decrease in touch reaction speed due to a time difference between a time when the image data IDATA is processed and a time when the image data IDATA is displayed.

[0109] However, in the image determiner 200 according to the present embodiment and the display device 1000 having the image determiner 200, it is possible to quickly sense whether the image is changed by analyzing the initial image data (or part of the image data) of one frame in the first mode MODE1. Therefore, the driving mode of the display device 1000 can be quickly switched from the first mode MODE1, which is a low-frequency driving mode, to the second mode MODE2 in which a moving image is displayed. Therefore, the reduction in touch reaction speed and the error of touch recognition when the driving mode of the display device 1000 is switched from the first mode MODE1 to the second mode MODE2 can be minimized.

[0110] When the driving mode of the display device 1000 is switched from the first mode MODE1 to the second mode MODE2, the output frequencies of some scan signals may be increased again.

[0111] When the first partial image data and the second partial image data are equal to each other, the first frame data may be compared with the second frame data at a second time t2 of the frame.

[0112] When the first frame data and the second frame data are equal to each other, the first mode MODE1 may be maintained.

[0113] When the first frame data and the second frame data are different from each other, the still image flag S_FLAG may be changed to an inactive level, and the display device 1000 may be driven in the second mode MODE2.

[0114] Figure 5 It is shown that the Figure 1 2 is a block diagram of an image determiner 200 in a display device 1000 shown in FIG. Figure 6 is a diagram showing an exemplary embodiment according to the inventive concept Figure 5 FIG. 1 is a diagram showing a driving process of the display device 1000 performed by the image determiner 200 . Figure 7 is a diagram showing an exemplary embodiment according to the inventive concept. Figure 5 FIG. 1 is a diagram showing a driving process of the display device 1000 performed by the image determiner 200 .

[0115] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the image determiner 200 may include a checksum accumulator 220 , a storage (eg, memory) 240 , a comparator 260 , and a mode controller 280 .

[0116] In the following, for the sake of convenience of description, a situation will be described in which the first part of the image data PID1 is the image data accumulated at the first moment t1 of the previous frame, the second part of the image data PID2 is the image data accumulated at the first moment t1 of the current frame, the first frame data FD1 is the entire image data of the previous frame, and the second frame data FD2 is the entire image data of the current frame.

[0117] Figure 6 and Figure 7 It is shown that the second partial image data PID2 is the image data of the first pixel line, and the first time t1 is the time when the image data of the first pixel line is provided.

[0118] Figure 6 and Figure 7 For example, the k-1th frame, the kth frame, and the k+1th frame in the first mode MODE1 and the second mode MODE2 are shown. Figure 6 In the first mode MODE1, for example, image data may be provided to the display device 1000 as "DATA INPUT" from the first line to the nth line, and an image may be output as "IMAGE OUTPUT" from the first line to the nth line. In addition, INPUT and DISPLAY may correspond to input image data B, C, and D and display images B, B, and D, respectively.

[0119] The checksum accumulator 220 may accumulate the checksums CS1 and CS2 of the image data IDATA of the current frame. In an exemplary embodiment of the inventive concept, the checksum accumulator 220 may accumulate each of the first checksum CS1 corresponding to the second partial image data PID2 and the second checksum CS2 corresponding to the second frame data FD2. The first checksum CS1 and the second checksum CS2 may be provided to the memory 240 and the comparator 260. The first checksum CS1 and the second checksum CS2 provided to the memory 240 may be loaded to the comparator 260 after one frame.

[0120] In the present embodiment, the case where the data checksum is used in the image data comparison is described, but the image data comparison is not limited thereto. For example, the image data of each pixel with respect to adjacent frames can be directly compared with each other.

[0121] The memory 240 may store the checksums CS1 and CS2 of the image data IDATA. For example, the checksums CS1 and CS2 corresponding to one frame may be stored.

[0122] The comparator 260 may compare the checksums PCS1 and PCS2 of the previous frame with the checksums CS1 and CS2 of the current frame in response to comparison signals CP1 and CP2 for determining comparison timings. The comparator 260 may supply the comparison result CRV to the mode controller 280.

[0123] In an exemplary embodiment of the inventive concept, the comparator 260 may compare the first previous checksum PCS1 corresponding to the first partial image data PID1 and the first checksum CS1 corresponding to the second partial image data PID2 in response to the first comparison signal CP1. The first comparison signal CP1 may be activated at a first time t1 of each frame of the first mode MODE1.

[0124] When the first checksum CS1 and the first previous checksum PCS1 are equal to each other, the comparison result CRV of the comparator 260 may be a still image. Figure 6 As shown in , the activation level of the still image flag S_FLAG and the driving of the first mode MODE1 are maintained, and the image does not change.

[0125] When the first checksum CS1 and the first previous checksum PCS1 are different from each other, the comparison result CRV of the comparator 260 is a moving image. Figure 7 As shown in , the still image flag S_FLAG is changed to a non-activated level, the driving mode of the display device 1000 is switched to the second mode MODE2, and the image can be changed. In addition, the image of the current frame can be delayed by a delay time DT to be displayed. That is, the moment when the second mode MODE2 is activated and the start moment when the image corresponding to the second frame data FD2 is displayed are synchronized with each other.

[0126] For example, the delay time DT may be a period from the moment when the image data of the first pixel line is supplied to the moment when all the image data of the first pixel line is supplied. Such a delay in image display may be achieved by a line buffer, etc., which delays the image data signal RGB provided to the data driver 380. Since the delay time DT included in one frame is very short, the image of the next frame may be quickly displayed without frame disappearance or the addition of a large amount of buffers, memories, etc.

[0127] In an exemplary embodiment of the inventive concept, the comparator 260 may compare the second previous checksum PCS2 corresponding to the first frame data FD1 and the second checksum CS2 corresponding to the second frame data FD2 in response to the second comparison signal CP2. The second comparison signal CP2 may be activated at a second time t2 of each frame of the first mode MODE1 and a second time t2 of each frame of the second mode MODE2.

[0128] When the second check sum CS2 and the second previous check sum PCS2 are equal to each other in the first mode MODE1, the comparison result CRV of the comparator 260 may be a still image. Figure 6 As shown in , the activation level of the still image flag S_FLAG and the driving of the first mode MODE1 are maintained, and the image does not change.

[0129] When the second check sum CS2 and the second previous check sum PCS2 are different from each other in the first mode MODE1, the comparison result CRV of the comparator 260 may be a moving image. Figure 6 As shown in , the still image flag S_FLAG is changed to an inactive level, the driving mode of the display device 1000 is switched to the second mode MODE2, and the image can be changed. In addition, the image of the current frame (eg, Figure 6 The image C shown in FIG. 1 may be skipped, and the image of the next frame may be displayed by the image data of the next frame (eg, Figure 6 Image D) shown in .

[0130] However, this is merely illustrative, and the display device 1000 may further include a frame memory so that an image of a current frame is delayed by one frame or more to be displayed.

[0131] When the second check sum CS2 and the second previous check sum PCS2 are different from each other in the second mode MODE2, the driving mode of the display device 1000 may maintain the second mode MODE2.

[0132] When the second checksum CS2 and the second previous checksum PCS2 are equal to each other in the second mode MODE2, the comparison result CRV of the comparator 260 may be a still image. Figure 4 As shown in , the still image flag S_FLAG is changed to an active level, the driving mode of the display device 1000 is switched to the first mode MODE1, and the image can be maintained. Therefore, the display device 1000 can be operated in the low frequency driving mode.

[0133] The mode controller 280 may output a still image flag S_FLAG for determining activation of the first mode MODE1 or the second mode MODE2 based on the comparison result CRV. The still image flag S_FLAG may be provided to the panel driver 300. In an exemplary embodiment of the inventive concept, an activation level of the still image flag S_FLAG may correspond to the first mode MODE1, and a deactivation level of the still image flag S_FLAG may correspond to the second mode MODE2.

[0134] As described above, the display device 1000 according to the exemplary embodiment of the inventive concept can quickly sense whether the image is changed by analyzing the initial image data of one frame in the first mode MODE1. Therefore, the driving mode of the display device 1000 can be quickly switched from the first mode MODE1 (e.g., the low-frequency driving mode) to the second mode MODE2 in which the moving image is displayed without disappearance of the image frame. Therefore, when the driving mode of the display device 1000 is switched from the first mode MODE1 to the second mode MODE2, the reduction in touch reaction speed and the error of touch recognition can be minimized.

[0135] Figure 8 It is shown that the Figure 1 1 is a block diagram of a portion of another exemplary embodiment of a panel driver in a display device 1000 shown in FIG. Fig. 9 It is shown that the Figure 8 FIG. 4 is a diagram of a display delay 370 in a panel driver shown in FIG.

[0136] Reference Figure 1 as well as Figures 4 to 9 When the first partial image data PID1 and the second partial image data PID2 are different from each other in the first mode MODE1 (for example, when the first check sum CS1 and the first previous check sum PCS1 are different from each other in the first mode MODE1), the panel driver 301 can delay the second frame data FD2 to a moment after the first moment t1 to be output.

[0137] The panel driver 301 may include a timing controller 320, a data driver 380, and a display delayer 370. The panel driver 301 may further include a scan driver and an emission driver.

[0138] The data driver 380 may convert the image data IDATA (or the image data signal RGB) into a data signal and provide the data signal to the display panel 100 .

[0139] The scan driver 340 may provide a scan signal to the display panel 100 at a first frequency in the first mode MODE1, and provide a scan signal to the display panel 100 at a second frequency in the second mode MODE2. The second frequency is higher than the first frequency. In an exemplary embodiment of the inventive concept, a plurality of different scan signals may be supplied to a plurality of components included in one pixel PX, and the frequencies of some of the plurality of scan signals may be changed according to a driving mode of the display device 1000.

[0140] The display delayer 370 may delay the supply of the second frame data FD2 to the data driver 380 to a time after the first time t1 in response to the comparison result CRV of the first partial image data PID1 and the second partial image data PID2. For example, the display delayer 370 may delay the supply of the image data signal RGB received from the timing controller 320 in response to the still image flag S_FLAG. The image data signal RGB may correspond to the second frame data FD2.

[0141] Despite Figure 8 3 shows a case where the display delayer 370 receives the image data signal RGB from the timing controller 320, but the display delayer 370 is not limited thereto. For example, the display delayer 370 may provide the image data IDATA to the timing controller 320. Alternatively, at least some components of the display delayer 370 may be included in at least a portion of the data driver 380 and the timing controller 320.

[0142] like Fig. 9 As shown in FIG. 3 , the display delayer 370 may include a selector 375 and a plurality of line buffers 37_1 to 37_k that are subordinately coupled to each other. Each of the line buffers 37_1 to 37_k may delay the supply of image data for one pixel line.

[0143] In an exemplary embodiment of the inventive concept, the number of line buffers 37_1 to 37_k may be determined by the size of the first partial image data PID1 (and the second partial image data PID2). For example, when the first partial image data PID1 includes image data of the first pixel line to the tenth pixel line, ten line buffers 37_1 to 37_10 may be combined. Therefore, the image data signal RGB may be delayed by the delay time DT to be provided to the data driver 380 or the display panel 100. In an exemplary embodiment of the inventive concept, the delay time DT may correspond to a period from a start time when image data of a current frame is provided to a time when image data of a k-th pixel line (e.g., the tenth pixel line) is provided.

[0144] The selector 375 may select and output one of the delayed image data signal D_RGB and the non-delayed image data signal RGB from the line buffers 37_1 to 37_k based on the selection signal SS. For example, the non-delayed image data signal RGB may be output when the selection signal SS is not applied, and the delayed image data signal D_RGB may be output when the selection signal SS is applied.

[0145] When the still image flag S_FLAG is changed from an active level to an inactive level due to the image data comparison at the first time t1, the selection signal SS may be supplied synchronously with the still image flag S_FLAG. For example, the selector 375 may output the delayed image data signal D_RGB only when the first partial image data PID1 and the second partial image data PID2 are different from each other at the first time t1.

[0146] In another exemplary embodiment of the inventive concept, driving of the line buffers 37_1 to 37_k may be controlled by a predetermined control signal. For example, the image data signal RGB may be provided to the line buffers 37_1 to 37_k only when the first and second partial image data PID1 and PID2 are different from each other at the first time t1.

[0147] As described above, when the driving mode of the display device 1000 is switched according to the initial image determination result at the first time t1 in the first mode MODE1, the image of the current frame can be output after a very short delay time DT by the display delayer 370. Therefore, it is possible to prevent the frame from disappearing when the driving mode of the display device 1000 is switched from the first mode MODE1 to the second mode MODE2. In addition, components such as a frame memory for delaying the entirety of one frame can be removed, and an error in touch recognition caused by a display delay in units of frames related to the frame memory can be minimized.

[0148] Fig.10 is a flowchart illustrating a method for driving the display device 1000 according to an exemplary embodiment of the inventive concept.

[0149] Reference Fig.10 In the method, the display device 1000 may be driven in a first mode (S100), and an image may be determined by comparing a first portion of image data with a second portion of image data at a first moment (S210).

[0150] In an exemplary embodiment of the inventive concept, when the first portion of the image data and the second portion of the image data are different from each other, the first mode can be switched to the second mode, and the image of the current frame can be delayed by a delay time to be displayed (S240). In addition, the frequency of some scanning signals applied to the pixels corresponding to the second mode can be increased (S250).

[0151] In an exemplary embodiment of the inventive concept, when the first portion of the image data and the second portion of the image data are equal to each other, the first frame data can be compared with the second frame data at a second moment of the current frame (S220). When the first frame data and the second frame data are different from each other, the first mode can be switched to the second mode so that the image of the next frame is displayed (S260).

[0152] When the first frame data and the second frame data are equal to each other, the low frequency driving of the first mode may be maintained ( S230 ).

[0153] In an exemplary embodiment of the inventive concept, the comparison of the first partial image data with the second partial image data and the comparison of the first frame data with the second frame data may be performed by comparing their cumulative checksums.

[0154] Already referred to Figures 1 to 9 The driving in the first mode is described in detail, and thus, a repeated description will be omitted.

[0155] Fig.11 It is shown Fig.10 Flowchart of the method of operation in the second mode is shown in FIG.

[0156] Fig.11 Driving in the second mode after the driving mode of the display device 1000 is switched from the first mode to the second mode according to an exemplary embodiment of the inventive concept is illustrated.

[0157] Reference Fig.11 , in the method for driving the display device 1000, the display device 1000 may be driven in a second mode (S300), and an image may be determined by comparing the first frame data with the second frame data at a second moment of a current frame (S420).

[0158] In an exemplary embodiment of the inventive concept, when the first frame data and the second frame data are equal to each other, the second mode can be switched to the first mode and the frequency of some scanning signals can be reduced (S440). In other words, low frequency driving using various methods can be performed to reduce power consumption in the first mode.

[0159] When the first frame data and the second frame data are different from each other, the second mode may be maintained (S460).

[0160] Already referred to Figures 1 to 9 The driving in the second mode is described in detail, and thus, a repeated description will be omitted.

[0161] As described above, in the display device and the driving method thereof according to the exemplary embodiment of the present invention, it is possible to quickly sense whether the image is changed by analyzing the initial image data of one frame in the first mode. Therefore, when the image is changed in the first mode, the driving mode of the display device 1000 can be quickly switched from the first mode, which is a low-frequency driving mode, to the second mode without the disappearance of the image frame. Therefore, the reduction in touch reaction speed and the error of touch recognition when the driving mode of the display device 1000 is switched from the first mode to the second mode can be minimized.

[0162] Furthermore, a complicated memory or the like for frame delay, which would be used when the driving mode of the display device 1000 is switched from the first mode to the second mode, may not be used.

[0163] In a display device and a driving method thereof according to an exemplary embodiment of the present invention, it is possible to quickly sense whether an image has been changed by analyzing the initial image data of the current frame only in a first mode (e.g., a still image mode or a low-frequency driving mode). Therefore, when the image is changed in the first mode, the driving mode of the display device can be quickly switched from the first mode to the second mode without the disappearance of the image frame. Therefore, when the driving mode of the display device is switched from the first mode to the second mode, the inconsistency between the image displayed in the display device and the image data input to the display device can be minimized. Therefore, the reduction in touch reaction speed and the error in touch recognition can be minimized.

[0164] Furthermore, it is possible not to use a complicated memory or the like which would be used for frame delay when the driving mode of the display device is switched from the first mode to the second mode.

[0165] While the inventive concept has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the inventive concept as set forth in the following claims.

Claims

1. A display device, comprising: an image determiner configured to receive image data in frames, determine whether to display a still image by comparing first partial image data as part of image data of a previous frame with second partial image data as part of image data of a current frame at a first moment of a first mode of displaying a non-moving image, and determine whether to display the still image by comparing first frame data as all image data of a previous frame with second frame data as all image data of a current frame at a second moment of a second mode of displaying a moving image; a display panel including pixels receiving data signals corresponding to the image data received by the image determiner; as well as a panel driver configured to change a frequency of driving the pixels according to the first mode and the second mode, Wherein, when the first part of image data and the second part of image data are equal to each other in the first mode, the image determiner again determines whether to display the still image by comparing the entire image data of the previous frame with the entire image data of the current frame at a second moment in the first mode, and the first moment and the second moment of the first mode occur in a frame of the first mode.

2. The display device according to claim 1, wherein: The display panel includes n pixel lines, where n is a positive integer. The first portion of image data and the second portion of image data correspond to a first pixel line to a k-th pixel line, where k is a positive integer less than n.

3. The display device according to claim 1, wherein: The first portion of image data and the second portion of image data correspond to a first line of pixels.

4. The display device according to claim 1, wherein: The display panel includes n pixels, where n is a positive integer. The first portion of image data and the second portion of image data correspond to a first pixel to a k-th pixel, where k is a positive integer less than n.

5. The display device according to claim 1, wherein: When the first partial image data and the second partial image data are different from each other in the first mode, the image determiner switches the first mode to the second mode, and the panel driver delays the second frame data by a predetermined time.

6. The display device according to claim 5, wherein: The panel driver increases an output frequency of at least some of a plurality of scan signals applied to each of the pixels in the second mode.

7. The display device according to claim 5, wherein: The time when the second mode is activated and the start time when the image corresponding to the second frame data is displayed are synchronized with each other.

8. The display device according to claim 1, wherein: When the first frame data and the second frame data are different from each other in the first mode, the image determiner switches the first mode to the second mode.

9. The display device according to claim 1, wherein: The first time instant corresponds to a time instant at which the second portion of image data in the current frame is provided to the image determiner.

10. The display device according to claim 1, wherein: The second time of the second mode corresponds to a time when all of the second frame data is provided to the image determiner.

11. The display device according to claim 1, wherein: The image determiner comprises: a checksum accumulator configured to accumulate a checksum of the image data of the current frame; a memory configured to store a checksum of the image data of the previous frame; a comparator configured to compare the checksum of the first portion of image data with the checksum of the second portion of image data at the first moment in the first mode, and to compare the checksum of the first frame data with the checksum of the second frame data at the second moment in the first mode and at the second moment in the second mode; and A mode controller is configured to output a still image flag for determining activation of the first mode or the second mode based on the comparison result.

12. The display device according to claim 11, wherein: The panel driver is driven in the first mode in response to an activation level of the still image flag, and is driven in the second mode in response to an inactivation level of the still image flag.

13. The display device according to claim 11, wherein: The panel driver comprises: a data driver configured to convert the image data into the data signal and provide the data signal to the display panel; a scan driver configured to provide a scan signal to the display panel at a first frequency in the first mode, and to provide the scan signal to the display panel at a second frequency higher than the first frequency in the second mode; and A display delayer is configured to delay supply of the second frame data to the data driver for a predetermined time in response to a comparison result of the first partial image data and the second partial image data.

14. The display device according to claim 13, wherein: The display delayer includes a line buffer configured to receive the image data and provide the image data to the data driver.

15. A method for driving a display device, the method comprising: In a first mode for displaying a still image, comparing, at a first moment of a current frame, first portion of image data as a portion of image data of a previous frame with second portion of image data as a portion of image data of the current frame; When the first partial image data and the second partial image data are different from each other, switching the first mode to a second mode for displaying a moving image, and delaying an image to be displayed by a predetermined time, the predetermined time being a period from a time when supply of image data of the current frame starts to the first time, wherein the image to be displayed corresponds to the current frame; and The frequency of at least some of the scan signals applied to the pixels is increased in the second mode.

16. The method according to claim 15, further comprising: When the first portion of image data and the second portion of image data are equal to each other, at a second moment of the current frame, comparing the first frame data as the entire image data of the previous frame with the second frame data as the entire image data of the current frame; When the first frame data and the second frame data are different from each other, displaying an image of a next frame by switching the first mode to the second mode; and When the first frame data and the second frame data are equal to each other, the first mode is maintained.

17. The method according to claim 16, wherein: The first time is a time until data of the second partial image data is received, and the second time is a time when all of the second frame data is received.

18. The method according to claim 15, further comprising: comparing the first frame data as all image data of the previous frame with the second frame data as all image data of the current frame at a second moment in the second mode; When the first frame data and the second frame data are different from each other, maintaining the second mode; and When the first frame data and the second frame data are equal to each other, the second mode is switched to the first mode and the frequencies of the at least some scanning signals are reduced.

19. The method according to claim 15, wherein: The display panel for displaying the image includes n pixel lines, where n is a positive integer. The first portion of image data and the second portion of image data correspond to a first pixel line to a k-th pixel line, where k is a positive integer less than n.

20. A display device, comprising: Display panel, including pixels; An image determiner configured to: in a first mode for displaying a still image, at a first moment of a current frame, compare a first portion of image data of a previous frame with a second portion of image data of the current frame; switching the first mode to a second mode for displaying a moving image when the first partial image data and the second partial image data are different from each other, and delaying the image to be displayed of the current frame by a predetermined time; as well as a driver configured to increase the frequency of the first scanning signal applied to the pixel in the second mode, Wherein, when the first part of the image data and the second part of the image data are equal to each other in the first mode, the image determiner is also configured to compare the entire image data of the previous frame with the entire image data of the current frame at a second moment in the first mode, and the first moment and the second moment of the first mode occur in a frame of the first mode.

21. The display device according to claim 20, wherein: When the first portion of the image data and the second portion of the image data are different from each other, the frequency of the first scanning signal increases.

22. The display device according to claim 20, wherein: The predetermined time is a period from the time when the supply of the image data of the current frame starts to the first time.

Images