Display device

Abstract

A display device includes a display panel that displays an image based on input image data, a data driver that outputs data voltages to data lines, and a drive controller that determines a driving frequency of the display panel based on the input image data. The drive controller includes a flicker value memory configured to store flicker values ​​for grayscale values ​​corresponding to the input image data; a voltage drop determiner configured to adjust a flicker value in the flicker value based on a voltage drop across the display panel; a still image determiner configured to determine whether the input image data is a still image or a video image; and a drive frequency determiner configured to determine a driving frequency of the display panel using the flicker value based on the input image data being a still image.

Description

Technical Field

[0001] Example embodiments of the present inventive concept relate to a display device and a method of driving a display panel using the same. More particularly, example embodiments of the present inventive concept relate to a display device that reduces power consumption and improves display quality and a method of driving a display panel using the same. Background Art

[0002] Recent research focuses on minimizing the power consumption of electronic devices, particularly mobile devices such as tablet personal computers (PCs) and notebook PCs.

[0003] In order to minimize the power consumption of an electronic device including a display panel, it is also necessary to minimize the power consumption of the display panel. When the display panel displays a still image, the display panel can be driven in a low-frequency mode so that the power consumption of the display panel can be reduced.

[0004] However, driving the display panel in a relatively low frequency mode may cause image flickering, which may degrade display quality. In particular, image flickering may become a more serious problem at a portion of the display panel that is away from the data driver (e.g., the lower portion) due to a voltage drop in the driving voltage or the data voltage on the data line. Summary of the Invention

[0005] Example embodiments of the inventive concepts provide a display device capable of reducing power consumption and improving display quality.

[0006] Example embodiments of the inventive concepts also provide a method of driving a display panel using the display device.

[0007] In an example embodiment of a display device according to the present invention, the display device includes a display panel, a data driver, and a drive controller. The display panel includes data lines and pixels connected to the data lines. The display panel is configured to display an image based on input image data. The data driver is configured to output data voltages to the data lines. The drive controller is configured to control the operation of the data driver and determine a driving frequency of the display panel based on the input image data. The drive controller includes: a flicker value memory configured to store flicker values ​​of grayscale values ​​corresponding to the input image data; a voltage drop determiner configured to adjust the flicker value in the flicker value based on a voltage drop of the display panel; a still image determiner configured to determine whether the input image data is a still image or a video image; and a drive frequency determiner configured to determine the driving frequency of the display panel using the flicker value based on whether the input image data is a still image.

[0008] In an example embodiment, the voltage drop determiner may be configured to determine a just noticeable difference (JTD) for a user based on the voltage drop of the display panel. The flicker value may be adjusted based on the JTD.

[0009] In an example embodiment, the flicker value memory may include a plurality of flicker lookup tables. The voltage drop determiner may determine that the reference just noticeable difference corresponds to a first just noticeable difference based on the voltage drop of the display panel, and the driving frequency determiner may be configured to determine the driving frequency using a first flicker lookup table corresponding to the first just noticeable difference. The voltage drop determiner may determine that the reference just noticeable difference corresponds to a second just noticeable difference based on the voltage drop of the display panel, and the driving frequency determiner may be configured to determine the driving frequency using a second flicker lookup table corresponding to the second just noticeable difference.

[0010] In example embodiments, the voltage drop determiner may be configured to set a reference just noticeable difference based on the voltage drop.The size of the low-driving grayscale range may be determined based on the reference just noticeable difference.

[0011] In example embodiments, the voltage drop determiner may determine the voltage drop by sensing a current flowing through a pixel or a current flowing through a data line.

[0012] In example embodiments, the display apparatus may further include an ambient light determiner configured to adjust the flicker value based on the intensity of the ambient light.

[0013] In an example embodiment, the ambient light determiner may be configured to determine a user's just noticeable difference (JND) based on the intensity of the ambient light. The flicker value may be adjusted based on the JND.

[0014] In example embodiments, the ambient light determiner may be configured to set a reference just noticeable difference based on the intensity of the ambient light.The size of the low-driving grayscale range may be determined based on the reference just noticeable difference.

[0015] In example embodiments, the display apparatus may further include a user brightness setter configured to adjust the flicker value based on a user brightness setting value set by a user.

[0016] In an example embodiment, the user brightness setter may be configured to determine a user's just noticeable difference (JND) based on the user brightness setting value. The flicker value may be adjusted based on the JND.

[0017] In an example embodiment, the user brightness setter may be configured to set a reference just noticeable difference based on the user brightness setting value.The size of the low-drive grayscale range may be determined based on the reference just noticeable difference.

[0018] In an example embodiment, the driving controller may further include a fixed frequency determiner configured to determine the type of the input frequency of the input image data by counting the number of pulses of the horizontal synchronization signal between the first pulse and the second pulse of the vertical synchronization signal, or by counting the number of pulses of the data enable signal between the first pulse and the second pulse of the vertical synchronization signal.

[0019] In example embodiments, the fixed frequency determiner may be configured to generate a frequency flag indicating a type of input frequency of the input image data.The driving frequency determiner may be configured to determine the driving frequency of the display panel based on the frequency flag.

[0020] In example embodiments, the display panel may include a plurality of segments, and the driving controller may be configured to determine a driving frequency of the display panel based on the plurality of segments.

[0021] In example embodiments, the display device may further include a driving mode setter configured to adjust the flicker value based on brightness of the display image according to the driving mode.

[0022] In an example embodiment, the driving mode setter may be configured to determine a just noticeable difference (JTD) for a user according to the driving mode, and the flicker value may be adjusted according to the JTD.

[0023] In example embodiments, the driving mode setter may be configured to set a reference just noticeable difference based on brightness of a display image according to the driving mode.A size of the low-driving grayscale range may be determined based on the reference just noticeable difference.

[0024] In an exemplary embodiment of a method for driving a display panel, the method includes: determining whether input image data is a still image or a video image; determining a driving frequency of the display panel using a flicker value memory storing flicker values ​​of grayscale values ​​corresponding to the input image data based on the input image data being the still image; and outputting a data voltage to a data line of the display panel based on the driving frequency. The flicker value is adjusted based on a voltage drop of the display panel.

[0025] In an example embodiment, the flicker value may be adjusted according to a user's just-noticeable-difference and a voltage drop of a display panel.

[0026] In an example embodiment, the flicker value memory may include a plurality of flicker lookup tables. A reference just noticeable difference (JPD) may be determined to correspond to a first JPD based on a voltage drop of the display panel, and a driving frequency may be determined using a first flicker lookup table corresponding to the first JPD. A reference JPD may be determined to correspond to a second JPD based on the voltage drop of the display panel, and a driving frequency may be determined using a second flicker lookup table corresponding to the second JPD.

[0027] In example embodiments, the reference just noticeable difference may be set based on the voltage drop.The size of the low-driving grayscale range may be determined based on the reference just noticeable difference.

[0028] In example embodiments, the voltage drop may be determined by sensing a current flowing through a pixel or a current flowing through a data line.

[0029] In an example embodiment, the flicker value may be adjusted based on the intensity of ambient light or a user brightness setting.

[0030] According to this display device and method for driving a display panel using the same, a driving frequency is determined based on an image displayed on the display panel to reduce power consumption of the display device. Furthermore, the driving frequency is determined based on a flicker value of an image on the display panel to prevent image flicker and improve the display quality of the display panel. Furthermore, the display device may include a voltage drop determiner for adjusting the flicker value based on a voltage drop across the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features and advantages of the present inventive concept will become more apparent by describing in detail example embodiments of the present inventive concept with reference to the accompanying drawings, in which:

[0032] Figure 1 is a block diagram illustrating a display device according to an example embodiment of the inventive concept;

[0033] Figure 2 According to an exemplary embodiment of the present invention Figure 1 The block diagram of the drive controller;

[0034] Figure 3 is a graph showing a user's just noticeable difference;

[0035] Figure 4 yes Figure 2 a table of exemplary flicker value memories;

[0036] Figure 5 yes Figure 2 a table of exemplary flicker value memories;

[0037] Figure 6 yes Figure 2 a table of exemplary flicker value memories;

[0038] Figure 7 is a block diagram of a driving controller of a display device according to an example embodiment of the inventive concept;

[0039] Figure 8 is a block diagram of a driving controller of a display device according to an example embodiment of the inventive concept;

[0040] Figure 9 is a block diagram of a driving controller of a display device according to an example embodiment of the inventive concept;

[0041] Figure 10 is a block diagram of a driving controller of a display device according to an example embodiment of the inventive concept;

[0042] Figure 11 is a block diagram of a driving controller of a display device according to an example embodiment of the inventive concept;

[0043] Figure 12 It is a timing diagram of the vertical synchronization signal, horizontal synchronization signal and data enable signal in the frame;

[0044] Figure 13 is a conceptual diagram illustrating a display panel of a display device according to an example embodiment of the inventive concept; and

[0045] Figure 14 yes Figure 13 A block diagram of a driving controller of a display device. DETAILED DESCRIPTION

[0046] Hereinafter, the present inventive concept will be described in detail with reference to the accompanying drawings.

[0047] Figure 1 is a block diagram illustrating a display device according to an example embodiment of the inventive concept.

[0048] refer to Figure 1 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a driving controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0049] In one embodiment, the driving controller 200 and the data driver 500 may be integrally formed, or the driving controller 200, the gamma reference voltage generator 400, and the data driver 500 may be integrally formed. A driving module integrally including at least the driving controller 200 and the data driver 500 may be referred to as a timing controller embedded data driver (TED).

[0050] The display panel 100 includes a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P connected to the gate lines GL and the data lines DL. The gate lines GL may extend in a first direction D1, and the data lines DL may extend in a second direction D2 crossing the first direction D1.

[0051] The drive controller 200 may receive input image data IMG and an input control signal CONT from an external device (not shown). In one embodiment, the input image data IMG may include red image data, green image data, and blue image data. In another embodiment, the input image data IMG may include white image data. In another embodiment, the input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal.

[0052] The driving controller 200 generates a first control signal CONT1 , a second control signal CONT2 , a third control signal CONT3 , and a data signal DATA based on input image data IMG and an input control signal CONT.

[0053] The driving controller 200 generates a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT and outputs the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

[0054] The driving controller 200 generates a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0055] The driving controller 200 generates a data signal DATA based on the input image data IMG and outputs the data signal DATA to the data driver 500 .

[0056] In one embodiment, the driving controller 200 may adjust the driving frequency of the display panel 100 based on the input image data IMG.

[0057] The driving controller 200 generates a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and outputs the third control signal CONT3 to the gamma reference voltage generator 400 .

[0058] The structure and operation of the drive controller 200 refer to Figures 2 to 6 is described in more detail.

[0059] The gate driver 300 generates a gate signal in response to the first control signal CONT1 received from the driving controller 200. The gate driver 300 outputs the gate signal to the gate line GL. In one embodiment, the gate driver 300 may sequentially output the gate signal to the gate line GL. The gate driver 300 may be mounted on the display panel 100 or integrated on the display panel 100.

[0060] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to the third control signal CONT3 received from the driving controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF may have a value corresponding to a level of the data signal DATA.

[0061] In example embodiments, the gamma reference voltage generator 400 may be provided in the driving controller 200 or in the data driver 500 .

[0062] The data driver 500 receives the second control signal CONT2 and the data signal DATA from the driving controller 200, and receives the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 converts the data signal DATA into an analog data voltage using the gamma reference voltage VGREF. The data driver 500 outputs the data voltage to the data line DL.

[0063] Figure 2 According to an exemplary embodiment of the present invention Figure 1 1 is a block diagram of the driving controller 200. Figure 3 is a graph showing the just noticeable difference of a user. Figure 4 yes Figure 2 Table of exemplary flicker value memories. Figure 5 yes Figure 2 Table of exemplary flicker value memories. Figure 6 yes Figure 2 Table of exemplary flicker value memories.

[0064] The driving controller 200 may include a still image determiner 220, a driving frequency determiner 240, and a flicker value memory 260. The driving controller 200 may further include a voltage drop determiner 280.

[0065] The still image determiner 220 may determine whether the input image data IMG is a still image or a video image. The still image determiner 220 may output a flag SF indicating whether the input image data IMG is a still image or a video image to the driving frequency determiner 240. For example, when the input image data IMG is a still image, the still image determiner 220 may output the flag SF of 1 to the driving frequency determiner 240, and when the input image data IMG is a video image, the still image determiner 220 may output the flag SF of 0 to the driving frequency determiner 240. If the display panel 100 is operating in the always-on mode, the still image determiner 220 may output the flag SF of 1 to the driving frequency determiner 240.

[0066] When the flag SF is 1, the driving frequency determiner 240 may drive the switching element in the pixel P in a low driving frequency mode.

[0067] When the flag SF is 0, the driving frequency determiner 240 may drive the switching element in the pixel P in a normal driving frequency mode.

[0068] The driving frequency determiner 240 may determine the low driving frequency with reference to the flicker value memory 260. The flicker value memory 260 may include flicker values ​​representing a degree of flicker according to a grayscale value of the input image data IMG.

[0069] The flicker value memory 260 may store grayscale values ​​of the input image data IMG and flicker values ​​corresponding to the grayscale values ​​of the input image data IMG. The flicker values ​​may be used to determine the driving frequency of the display panel 100. For example, the flicker value memory 260 may include a lookup table.

[0070] The flicker value can be set based on the user's just noticeable difference in brightness. The just noticeable difference can represent the brightness difference that an average person can perceive. Figure 3 A curve CR showing the absolute value of the brightness difference of the red image, a curve CG showing the absolute value of the brightness difference of the green image, and a curve CB showing the absolute value of the brightness difference of the blue image are shown.

[0071] The just noticeable difference can be expressed as the slope of a curve of the absolute value of the brightness difference according to the brightness. When the just noticeable difference is determined as the first just noticeable difference value JND1, Figure 3 In the area below the line of the first just noticeable difference JND1, the user may not perceive flicker.

[0072] When the just noticeable difference is determined as the second just noticeable difference JND2, Figure 3In the area below the line of the second just noticeable difference JND2 in the image, the user may not perceive flicker. When the just noticeable difference changes from the first just noticeable difference JND1 to the second just noticeable difference JND2, the user becomes less sensitive to brightness differences. When the just noticeable difference changes from the first just noticeable difference JND1 to the second just noticeable difference JND2, the area where the user does not perceive flicker can be increased, and the low drive grayscale range driven at a low drive frequency can be increased.

[0073] As mentioned above, the flicker value can be varied according to the just noticeable difference.

[0074] The voltage drop determiner 280 can adjust the flicker value based on the voltage drop of the display panel 100. For example, the voltage drop can include a drop in the driving voltage of the pixel P. For example, the voltage drop can include a drop in the data voltage. When the flicker value is determined based solely on the grayscale value of the input image data IMG without considering the voltage drop of the display panel 100, the user may perceive flicker at a portion of the display panel 100 away from the data driver 500 due to the voltage drop of the display panel 100. Therefore, the voltage drop of the display panel 100 can be taken into account when determining the driving frequency.

[0075] The voltage drop determiner 280 may determine a user's just noticeable difference according to the voltage drop of the display panel 100. In addition, the flicker value may be adjusted according to the just noticeable difference.

[0076] When the voltage drop is large, the voltage drop determiner 280 may set the reference just noticeable difference to be small. That is, the reference just noticeable difference may be inversely proportional to the voltage drop. When the reference just noticeable difference is small, the size of the low-drive grayscale range may be small. The size of the low-drive grayscale range may be inversely proportional to the reference just noticeable difference.

[0077] In contrast, when the voltage drop is small, the voltage drop determiner 280 may set the reference just noticeable difference to be large. When the reference just noticeable difference is large, the size of the low-driving grayscale range may be large.

[0078] The flicker value memory 260 may include a plurality of flicker lookup tables. Figure 4 A first flicker lookup table stored in the flicker value memory 260 is shown. Figure 5 A second flicker lookup table stored in the flicker value memory 260 is shown. Figure 6 The third flicker lookup table is shown stored in the flicker value memory 260. As described above, the first to third flicker lookup tables may be stored in a single memory, such as the flicker value memory 260. Alternatively, the first to third flicker lookup tables may be stored in separate memories, respectively.

[0079] When the voltage drop determiner 280 determines that the reference just noticeable difference corresponds to the first just noticeable difference according to the voltage drop of the display panel 100 , the driving frequency determiner 240 may determine the driving frequency using a first flicker lookup table corresponding to the first just noticeable difference.

[0080] When the voltage drop determiner 280 determines that the reference just noticeable difference corresponds to the second just noticeable difference according to the voltage drop of the display panel 100 , the driving frequency determiner 240 may determine the driving frequency using a second flicker lookup table corresponding to the second just noticeable difference. Figure 5 The voltage drop in Figure 4 The voltage drop in Figure 5 The second just noticeable difference in Figure 4 The first just noticeable difference in . Therefore, Figure 5 The size of the low drive grayscale range in can be larger than Figure 4 The size of the low-drive grayscale range in .

[0081] When the voltage drop determiner 280 determines that the reference just noticeable difference corresponds to the third just noticeable difference according to the voltage drop of the display panel 100 , the driving frequency determiner 240 may determine the driving frequency using a third flicker lookup table corresponding to the third just noticeable difference. Figure 6 The voltage drop in Figure 5 The voltage drop in Figure 6 The third just noticeable difference can be greater than Figure 5 The second just noticeable difference in . Therefore, Figure 6 The size of the low drive grayscale range in can be larger than Figure 5 The size of the low-drive grayscale range in .

[0082] exist Figures 4 to 6 , the input grayscale value of the input image data IMG may be 8 bits (i.e., 0 to 255), the minimum grayscale value of the input image data IMG may be 0, and the maximum grayscale value of the input image data IMG may be 255. The number of flicker setting levels of the flicker value memory 260 may be 64. When the number of flicker setting levels increases, flicker can be effectively eliminated, but the logical size of the drive controller 200 may increase. Therefore, the number of flicker setting levels may be limited by the logical size of the drive controller 200.

[0083] Despite Figures 4 to 6 , the input grayscale value of the input image data IMG is shown as 8 bits, but the inventive concept may not be limited thereto.

[0084] exist Figure 4In the example, the number of grayscale values ​​of the input image data IMG is 256 and the number of flicker setting levels is 64, and a single flicker value in the flicker value memory 260 can correspond to four grayscale values. The first flicker setting level stores a flicker value of 0 for grayscale values ​​0 to 3. Flicker value 0 can represent a driving frequency of 1 Hz. The second flicker setting level stores a flicker value of 0 for grayscale values ​​4 to 7. Flicker value 0 can represent a driving frequency of 1 Hz. The third flicker setting level stores a flicker value of 40 for grayscale values ​​8 to 11. Flicker value 40 can represent a driving frequency of 2 Hz. The fourth flicker setting level stores a flicker value of 80 for grayscale values ​​12 to 15. Flicker value 80 can represent a driving frequency of 5 Hz. The fifth flicker setting level stores a flicker value of 120 for grayscale values ​​16 to 19. Flicker value 120 can represent a driving frequency of 10 Hz. The sixth flicker setting level stores a flicker value of 160 for grayscale values ​​20 to 23. Flicker value 160 can represent a driving frequency of 30 Hz. The seventh flicker setting level stores a flicker value of 200 for grayscale values ​​24 to 27. The flicker value 200 can represent a driving frequency of 60 Hz. Similarly, each of the eighth to sixty-first flicker setting levels stores a flicker value and a driving frequency for the corresponding grayscale value. The sixty-second flicker setting level stores a flicker value of 0 for grayscale values ​​244 to 247. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-third flicker setting level stores a flicker value of 0 for grayscale values ​​248 to 251. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-fourth flicker setting level stores a flicker value of 0 for grayscale values ​​252 to 255. The flicker value 0 can represent a driving frequency of 1 Hz.

[0085] exist Figure 5, the number of grayscale values ​​of the input image data IMG is 256 and the number of flicker setting levels is 64, and a single flicker value in the flicker value memory 260 can correspond to four grayscale values. The first flicker setting level stores a flicker value of 0 for grayscale values ​​0 to 3. Flicker value 0 can represent a driving frequency of 1 Hz. The second flicker setting level stores a flicker value of 0 for grayscale values ​​4 to 7. Flicker value 0 can represent a driving frequency of 1 Hz. The third flicker setting level stores a flicker value of 0 for grayscale values ​​8 to 11. Flicker value 0 can represent a driving frequency of 1 Hz. The fourth flicker setting level stores a flicker value of 40 for grayscale values ​​12 to 15. Flicker value 40 can represent a driving frequency of 2 Hz. The fifth flicker setting level stores a flicker value of 80 for grayscale values ​​16 to 19. Flicker value 80 can represent a driving frequency of 5 Hz. The sixth flicker setting level stores a flicker value of 120 for grayscale values ​​20 to 23. Flicker value 120 can represent a driving frequency of 10 Hz. The seventh flicker setting level stores a flicker value of 160 for grayscale values ​​24 to 27. The flicker value 160 can represent a driving frequency of 30 Hz. Similarly, each of the eighth to sixty-first flicker setting levels stores a flicker value and a driving frequency for the corresponding grayscale value. The sixty-second flicker setting level stores a flicker value of 0 for grayscale values ​​244 to 247. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-third flicker setting level stores a flicker value of 0 for grayscale values ​​248 to 251. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-fourth flicker setting level stores a flicker value of 0 for grayscale values ​​252 to 255. The flicker value 0 can represent a driving frequency of 1 Hz.

[0086] As mentioned above, Figure 5 The size of the low drive grayscale range in can be larger than Figure 4 When the low drive grayscale range is determined as a grayscale range having a drive frequency equal to or less than 10 Hz, Figure 4 The low drive grayscale range can be between 0 and 19, while Figure 5 The low driving grayscale range in can be between 0 and 23. When the low driving grayscale range is determined as a grayscale range having a driving frequency equal to or less than 1 Hz, Figure 4 The low drive grayscale range can be between 0 and 7, while Figure 5 The low drive grayscale range can be between 0 and 11.

[0087] exist Figure 6, the number of grayscale values ​​of the input image data IMG is 256 and the number of flicker setting levels is 64, and a single flicker value in the flicker value memory 260 can correspond to four grayscale values. The first flicker setting level stores a flicker value of 0 for grayscale values ​​0 to 3. The flicker value 0 can represent a driving frequency of 1 Hz. The second flicker setting level stores a flicker value of 0 for grayscale values ​​4 to 7. The flicker value 0 can represent a driving frequency of 1 Hz. The third flicker setting level stores a flicker value of 0 for grayscale values ​​8 to 11. The flicker value 0 can represent a driving frequency of 1 Hz. The fourth flicker setting level stores a flicker value of 0 for grayscale values ​​12 to 15. The flicker value 0 can represent a driving frequency of 1 Hz. The fifth flicker setting level stores a flicker value of 40 for grayscale values ​​16 to 19. The flicker value 40 can represent a driving frequency of 2 Hz. The sixth flicker setting level stores a flicker value of 80 for grayscale values ​​20 to 23. The flicker value 80 can represent a driving frequency of 5 Hz. The seventh flicker setting level stores a flicker value of 120 for grayscale values ​​24 to 27. The flicker value 120 can represent a driving frequency of 10 Hz. Similarly, each of the eighth to sixty-first flicker setting levels stores a flicker value and a driving frequency for the corresponding grayscale value. The sixty-second flicker setting level stores a flicker value of 0 for grayscale values ​​244 to 247. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-third flicker setting level stores a flicker value of 0 for grayscale values ​​248 to 251. The flicker value 0 can represent a driving frequency of 1 Hz. The sixty-fourth flicker setting level stores a flicker value of 0 for grayscale values ​​252 to 255. The flicker value 0 can represent a driving frequency of 1 Hz.

[0088] As mentioned above, Figure 6 The size of the low drive grayscale range in can be larger than Figure 5 When the low drive grayscale range is determined as a grayscale range having a drive frequency equal to or less than 10 Hz, Figure 5 The low drive grayscale range can be between 0 and 23, while Figure 6 The low driving grayscale range in may be between 0 and 27. When the low driving grayscale range is determined as a grayscale range having a driving frequency equal to or less than 1 Hz, Figure 5 The low drive grayscale range can be between 0 and 11, and Figure 6 The low drive grayscale range can be between 0 and 15.

[0089] The voltage drop determiner 280 may sense current flowing through the pixel P or the data line DL to determine a voltage drop corresponding to the pixel P. The voltage drop may vary according to a propagation delay of the data line DL, a pixel structure of the display panel 100 , a transmission line structure of the display panel 100 , process variations of a pixel circuit of the display panel 100 , process variations of the data line DL, and a driving mode of the display panel 100 .

[0090] The voltage drop determiner 280 may store the value of the voltage drop of the display panel 100 during the manufacture and / or inspection of the display device. The voltage drop determiner 280 may determine the value of the voltage drop of the display panel 100 as an initial set of values ​​for driving the display device. In addition, the voltage drop determiner 280 may determine the voltage drop of the display panel 100 in real time while the display device is operating.

[0091] The voltage drop determiner 280 may generate a selection signal to select one of the first flicker lookup table, the second flicker lookup table, and the third flicker lookup table according to the degree of voltage drop. The driving frequency determiner 240 may refer to one of the first flicker lookup table, the second flicker lookup table, and the third flicker lookup table based on the selection signal. Alternatively, the voltage drop determiner 280 may directly update the flicker value stored in the flicker lookup table according to the degree of voltage drop.

[0092] Although the flicker value memory 260 stores three flicker lookup tables in the present exemplary embodiment, the inventive concept is not limited to this number of flicker lookup tables, but any number of flicker lookup tables may be used without departing from the scope of the present disclosure.

[0093] According to the present exemplary embodiment, the driving frequency of the display device is determined based on the image displayed on the display panel 100 to reduce the power consumption of the display device. In addition, the driving frequency can be determined using the flicker value of the image on the display panel 100 to prevent the flicker of the image and improve the display quality of the display panel 100. In addition, the display device includes a voltage drop determiner 280 for adjusting the flicker value based on the voltage drop of the display panel 100.

[0094] Figure 7 is a block diagram of a driving controller 200 of a display device according to an example embodiment of the inventive concept.

[0095] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference 100 except for the structure of the driving controller 200. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0096] The drive controller 200 may include a still image determiner 220, a drive frequency determiner 240, and a flicker value memory 260. The drive controller 200 may further include a voltage drop determiner 280. In this example embodiment, the drive controller 200 may further include an ambient light determiner 290. Although the ambient light determiner 290 is shown as being included in the drive controller 200 in this example embodiment, the present inventive concept may not be limited thereto. For example, the ambient light determiner 290 may be provided outside the drive controller 200.

[0097] The ambient light determiner 290 may adjust the flicker value based on the intensity of ambient light of the display device.

[0098] The ambient light determiner 290 may determine a just noticeable difference according to the intensity of the ambient light. In addition, the flicker value may be adjusted according to the just noticeable difference determined by the ambient light determiner 290.

[0099] When the intensity of ambient light is high, the ambient light determiner 290 may set the reference just noticeable difference to be large. That is, the reference just noticeable difference may be positively correlated with the ambient light. When the reference just noticeable difference is large, the size of the low-drive grayscale range may be large. The size of the low-drive grayscale range may be positively correlated with the reference just noticeable difference.

[0100] In contrast, when the intensity of the ambient light is small, the ambient light determiner 290 may set the reference just noticeable difference to be small. When the reference just noticeable difference is small, the size of the low-driving grayscale range may be small.

[0101] In this example embodiment, the flicker value may be adjusted based on a user's just noticeable difference according to a voltage drop and a user's just noticeable difference according to an intensity of ambient light.

[0102] In one embodiment, the ambient light determiner 290 may receive data from an external ambient light sensor included in the display device to determine the intensity of the ambient light.

[0103] According to this exemplary embodiment, the display device determines a driving frequency based on an image displayed on the display panel 100 to reduce power consumption of the display device. Furthermore, the driving frequency can be determined using a flicker value of an image displayed on the display panel 100 to prevent image flicker and improve the display quality of the display panel 100. Furthermore, the display device includes a voltage drop determiner 280 for adjusting the flicker value based on a voltage drop across the display panel 100, and an ambient light determiner 290 for adjusting the flicker value based on the intensity of ambient light.

[0104] Figure 8 is a block diagram of a driving controller 200 of a display device according to an example embodiment of the inventive concept.

[0105] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference 100 except for the structure of the driving controller 200. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0106] The drive controller 200 may include a still image determiner 220, a drive frequency determiner 240, and a flicker value memory 260. The drive controller 200 may further include a voltage drop determiner 280 and a user brightness setter 295. Although the user brightness setter 295 is shown as being included in the drive controller 200 in this exemplary embodiment, the present inventive concept is not limited thereto. For example, the user brightness setter 295 may be provided outside the drive controller 200.

[0107] The user brightness setter 295 can adjust the flicker value based on the user brightness setting value. The user brightness setting value can be set by an input device such as a user's finger, a touch pen, a keyboard, and a mouse. The user brightness setting value can represent the setting of the maximum brightness limit of the display panel 100.

[0108] The user brightness setter 295 may determine a just noticeable difference according to the user brightness setting value. In addition, the flicker value may be adjusted according to the just noticeable difference determined by the user brightness setter 295.

[0109] When the user brightness setting value is large, the user brightness setter 295 may set the reference just noticeable difference to be small. That is, the reference just noticeable difference may be inversely proportional to the user brightness setting value. When the reference just noticeable difference is small, the size of the low-drive grayscale range may be small.

[0110] On the contrary, when the user brightness setting value is small, the user brightness setter 295 may set the reference just noticeable difference to be large. When the reference just noticeable difference is large, the size of the low-driving grayscale range may be large.

[0111] In this example embodiment, the flicker value may be adjusted based on the user's just noticeable difference according to the voltage drop and the user's just noticeable difference according to the user's brightness setting value.

[0112] According to this exemplary embodiment, the display device determines a driving frequency based on an image displayed on the display panel 100 to reduce power consumption of the display device. Furthermore, the driving frequency can be determined using a flicker value of an image on the display panel 100 to prevent image flickering and improve the display quality of the display panel 100. Furthermore, the display device includes a voltage drop determiner 280 for adjusting the flicker value based on a voltage drop across the display panel 100 and a user brightness setter 295 for adjusting the flicker value based on a user brightness setting value.

[0113] Figure 9 is a block diagram of a driving controller 200 of a display device according to an example embodiment of the inventive concept.

[0114] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference 100 except for the structure of the driving controller 200. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0115] The drive controller 200 may include a still image determiner 220, a drive frequency determiner 240, and a flicker value memory 260. The drive controller 200 may further include a voltage drop determiner 280, an ambient light determiner 290, and a user brightness setter 295. Although the ambient light determiner 290 and the user brightness setter 295 are shown as being included in the drive controller 200 in this exemplary embodiment, the present inventive concept may not be limited thereto. For example, at least one of the ambient light determiner 290 and the user brightness setter 295 may be provided outside the drive controller 200.

[0116] In this example embodiment, the flicker value may be adjusted based on a user's just noticeable difference according to voltage drop, a user's just noticeable difference according to the intensity of ambient light, and a user's just noticeable difference according to a user brightness setting value.

[0117] According to this exemplary embodiment, the display device determines a driving frequency based on an image displayed on the display panel 100 to reduce power consumption of the display device. Furthermore, the driving frequency can be determined using a flicker value of an image displayed on the display panel 100 to prevent image flicker and improve the display quality of the display panel 100. Furthermore, the display device includes a voltage drop determiner 280 for adjusting the flicker value based on a voltage drop across the display panel 100, an external light determiner 290 for adjusting the flicker value based on the intensity of ambient light, and a user brightness setter 295 for adjusting the flicker value based on a user brightness setting value.

[0118] Figure 10 is a block diagram of a driving controller 200 of a display device according to an example embodiment of the inventive concept.

[0119] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference 100 except for the structure of the driving controller 200. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0120] The drive controller 200 may include a still image determiner 220, a drive frequency determiner 240, and a flicker value memory 260. The drive controller 200 may further include a voltage drop determiner 280 and a drive mode setter 298. Although the drive mode setter 298 is shown as being included in the drive controller 200 in this example embodiment, the present invention is not limited thereto. For example, the drive mode setter 298 may be provided outside the drive controller 200.

[0121] The driving mode setter 298 may adjust the flicker value based on the driving mode. The driving mode may be automatically set according to the input image data IMG.

[0122] Depending on the driving mode, the brightness of the displayed image may vary. When the brightness of the displayed image varies, the user's just noticeable difference may also vary.

[0123] The driving mode setter 298 may determine a just noticeable difference according to the driving mode. In addition, the flicker value may be adjusted according to the just noticeable difference determined by the driving mode setter 298.

[0124] When the brightness of the display image (e.g., the maximum brightness of the display image) is determined to be large according to the driving mode, the driving mode setter 298 may set the reference just noticeable difference to be small. The reference just noticeable difference may be inversely proportional to the maximum brightness of the display image. When the reference just noticeable difference is small, the size of the low-drive grayscale range may be small.

[0125] On the contrary, when the brightness of the display image (e.g., the maximum brightness of the display image) is determined to be small according to the driving mode, the driving mode setter 298 can set the reference just noticeable difference to be large. When the reference just noticeable difference is large, the size of the low driving grayscale range can be large.

[0126] In the present exemplary embodiment, the flicker value may be adjusted based on a user's just noticeable difference according to a voltage drop and a user's just noticeable difference according to a driving mode.

[0127] For example, the driving mode setter 298 may determine whether a high dynamic range (HDR) mode is enabled.

[0128] When the HDR mode is enabled, the display panel 100 can display bright parts of the displayed image brighter and dark parts of the displayed image darker. Therefore, when the HDR mode is enabled, the maximum brightness of the displayed image increases, so that the reference just noticeable difference can be set to be small. Conversely, when the HDR mode is disabled, the reference just noticeable difference can be set to be large.

[0129] According to the present exemplary embodiment, the display device determines a driving frequency based on an image displayed on the display panel 100 to reduce power consumption of the display device. Furthermore, the driving frequency can be determined using a flicker value of an image on the display panel 100 to prevent image flickering and improve the display quality of the display panel 100. Furthermore, the display device includes a voltage drop determiner 280 for adjusting the flicker value based on a voltage drop across the display panel 100 and a drive mode setter 298 for adjusting the flicker value based on a drive mode.

[0130] Figure 11 is a block diagram of a driving controller 200 of a display device according to an example embodiment of the inventive concept. Figure 12 It is a timing diagram of the vertical synchronization signal VSYNC, the horizontal synchronization signal HSYNC and the data enable signal DE in a frame.

[0131] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference 100 except for the structure of the driving controller 200. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0132] The drive controller 200 may include a still image determiner 220, a drive frequency determiner 240, and a flicker value memory 260. The drive controller 200 may further include a voltage drop determiner 280 and a fixed frequency determiner 210. Although the fixed frequency determiner 210 is shown as being included in the drive controller 200 in this example embodiment, the present invention is not limited thereto. For example, the fixed frequency determiner 210 may be provided outside the drive controller 200.

[0133] The fixed frequency determiner 210 may determine whether the input frequency of the input image data IMG is of a normal type. For example, the fixed frequency determiner 210 may determine whether the input frequency of the input image data IMG is of a normal type by counting the number of pulses of the horizontal synchronization signal HSYNC between the first pulse and the second pulse of the vertical synchronization signal VSYNC, or by counting the number of pulses of the data enable signal DE between the first pulse and the second pulse of the vertical synchronization signal VSYNC.

[0134] The duration between the first and second pulses of the vertical synchronization signal VSYNC can be defined as a frame (or image frame). When the input frequency of the input image data IMG is 60 Hz, the number of pulses of the horizontal synchronization signal HSYNC between the first and second pulses of the vertical synchronization signal VSYNC can be equal to or greater than 60. Furthermore, when the input frequency of the input image data IMG is 60 Hz, the number of pulses of the data enable signal DE between the first and second pulses of the vertical synchronization signal VSYNC can be 60. When the number of pulses of the data enable signal DE between the first and second pulses of the vertical synchronization signal VSYNC is equal to the input frequency of the input image data IMG, the fixed frequency determiner 210 can determine that the input frequency of the input image data IMG is of a normal type. Conversely, when the number of pulses of the data enable signal DE between the first and second pulses of the vertical synchronization signal VSYNC is not equal to the input frequency of the input image data IMG, the fixed frequency determiner 210 can determine that the input frequency of the input image data IMG is not of a normal type.

[0135] Fixed frequency determiner 210 may generate a frequency flag FF indicating whether the input frequency of input image data IMG is of a normal type. Fixed frequency determiner 210 may output frequency flag FF to driving frequency determiner 240. Driving frequency determiner 240 may determine the driving frequency of display panel 100 based on frequency flag FF. For example, when the input frequency of input image data IMG is not of a normal type, driving frequency determiner 240 may drive the switching element in pixel P at a normal driving frequency. When the input frequency of input image data IMG is not of a normal type and display panel 100 is driven at a low driving frequency, display defects may occur in display panel 100. In addition, because the driving frequency is fixed to the normal driving frequency when the input frequency of input image data IMG is not of a normal type, still image determiner 220 may not operate when the input frequency of input image data IMG is not of a normal type.

[0136] The still image determiner 220 may determine whether the input image data IMG is a still image or a video image. The still image determiner 220 may output a flag SF indicating whether the input image data IMG is a still image or a video image to the driving frequency determiner 240. For example, when the input image data IMG is a still image, the still image determiner 220 may output the flag SF of 1 to the driving frequency determiner 240. When the input image data IMG is a video image, the still image determiner 220 may output the flag SF of 0 to the driving frequency determiner 240. When the display panel 100 is operating in the always-on mode, the still image determiner 220 may output the flag SF of 1 to the driving frequency determiner 240.

[0137] When the flag SF is 1, the driving frequency determiner 240 may drive the switching element in the pixel P at a low driving frequency.

[0138] When the flag SF is 0, the driving frequency determiner 240 may drive the switching element in the pixel P at a normal driving frequency.

[0139] According to this exemplary embodiment, the display device determines a driving frequency based on an image displayed on the display panel 100 to reduce power consumption of the display device. In addition, the driving frequency is determined using a flicker value of an image on the display panel 100 to prevent image flicker and improve the display quality of the display panel 100.

[0140] Figure 13 is a conceptual diagram illustrating a display panel 100 of a display device according to an example embodiment of the inventive concept. Figure 14 yes Figure 13 1 is a block diagram of a driving controller 200 of a display device.

[0141] The display device and the method of driving the display panel according to the present exemplary embodiment are similar to those of the reference embodiment except that the display panel 100 is divided into a plurality of segments. Figures 1 to 6 The display device and the method of driving the display panel of the previous exemplary embodiment described are substantially the same. Therefore, the same reference numerals will be used to refer to the same components as those in the previous exemplary embodiment. Figures 1 to 6 The present invention relates to components that are the same as or similar to those described in the previous example embodiments of the present invention, and any repeated explanation regarding the above elements will be omitted.

[0142] refer to Figure 1 、 Figures 3 to 6 、 Figure 13 and Figure 14 , the display device includes a display panel 100 and a display panel driver.

[0143] The display panel 100 may include a plurality of segments SEG11 to SEG85. Although the display panel 100 is shown as including segments in an eight-by-five matrix in the present exemplary embodiment, the present inventive concept is not limited thereto. For ease of explanation, the display panel 100 is shown as including 40 segments in an eight-by-five matrix, but the display panel 100 may include a different number of segments.

[0144] The flicker value can be determined for each pixel. In this case, if only one pixel has a high flicker value, the entire display panel 100 can be driven at a high drive frequency to prevent flicker in the one pixel. For example, if flicker in only one pixel is prevented at a drive frequency of 30 Hz and other pixels do not flicker at a drive frequency of 1 Hz, the display panel 100 can be driven at a drive frequency of 30 Hz, and the power consumption of the display device may be higher than necessary.

[0145] In one embodiment, the display panel 100 can determine a flicker value for a segment unit. If only one pixel in a segment has a high flicker value, and the remaining pixels in the segment have a low flicker value, the flicker value of the segment can be determined as the average value of the flicker values ​​of the pixels in the same segment, and the average value of the flicker values ​​of the pixels in the segment can be used to determine the driving frequency of the pixels in the segment. For example, when the flicker of a single pixel in a segment can be prevented at a driving frequency of 30 Hz and the other pixels in the segment do not flicker at a driving frequency of 1 Hz, the display panel 100 can be driven at a driving frequency of 1 Hz or 2 Hz, which is less than the driving frequency of 30 Hz, based on the average value of the flicker values ​​of the pixels in the segment.

[0146] Since the display panel 100 is divided into a plurality of segments and the flicker value is determined for the segment unit, the power consumption of the display device can be effectively reduced.

[0147] The driving controller 200 may determine the optimal driving frequencies of the segments, and may determine a maximum driving frequency among the optimal driving frequencies of the segments as a low driving frequency of the display panel 100 .

[0148] For example, when the optimal driving frequency of the first segment SEG11 is 10 Hz and the optimal driving frequencies of the other segments SEG12 to SEG85 except the first segment SEG11 are 2 Hz, the driving controller 200 may use a low driving frequency of 10 Hz.

[0149] refer to Figure 14 , the driving controller 200 includes a still image determiner 220 , a driving frequency determiner 240 , a flicker value memory 260A, and a voltage drop determiner 280 .

[0150] The driving frequency determiner 240 may determine the low driving frequency with reference to the flicker value memory 260A and information of the segments of the display panel 100 .

[0151] The flicker value memory 260A may store grayscale values ​​of the input image data IMG and flicker values ​​corresponding to the grayscale values ​​of the input image data IMG. The flicker values ​​may be used to determine the driving frequency of the display panel 100. For example, the flicker value memory 260A may include a lookup table.

[0152] The voltage drop determiner 280 may adjust the flicker value based on the voltage drop of the display panel 100 .

[0153] The voltage drop determiner 280 may determine a user's just noticeable difference according to the voltage drop of the display panel 100. In addition, the flicker value may be adjusted according to the just noticeable difference.

[0154] When the voltage drop is large, the voltage drop determiner 280 may set the reference just noticeable difference to be small. When the reference just noticeable difference is small, the size of the low-driving grayscale range may be small.

[0155] In contrast, when the voltage drop is small, the voltage drop determiner 280 may set the reference just noticeable difference to be large. When the reference just noticeable difference is large, the size of the low-driving grayscale range may be large.

[0156] According to this exemplary embodiment, the display device determines a driving frequency based on the image displayed on the display panel 100 to reduce power consumption of the display device. Furthermore, the flicker value of the image on the display panel 100 can be used to determine the driving frequency to prevent image flicker and improve the display quality of the display panel 100. Furthermore, by adjusting the driving frequency on a segment basis, high-frequency driven grayscale areas driven at a high driving frequency can be reduced, further reducing power consumption of the display device while effectively preventing flicker.

[0157] According to the inventive concept as described above, the power consumption of a display device can be reduced, and the display quality of a display panel can be improved.

[0158] The foregoing is an illustration of example embodiments of the present inventive concept and should not be construed as limiting thereof. Although some example embodiments of the present inventive concept have been described herein, it will be readily understood by those skilled in the art that modifications may be made to the example embodiments without materially departing from the novel teachings and advantages of the present inventive concept. Therefore, all such modifications are intended to be included within the scope of the present inventive concept. In the claims, means-plus-function clauses are intended to cover structures described herein that perform the recited function, including not only structural equivalents but also equivalent structures. Aspects of the present inventive concept may be defined by the following claims, with equivalents of the claims being included therein.

Claims

1. A display device, comprising: a display panel including data lines and pixels connected to the data lines, and configured to display an image based on input image data; a data driver configured to output a data voltage to the data line; as well as a driving controller configured to control the operation of the data driver and determine a driving frequency of the display panel based on the input image data, The drive controller includes: a flicker value memory configured to store a plurality of flicker values ​​corresponding to grayscale values ​​of the input image data; a voltage drop determiner configured to determine a user's just noticeable difference according to a voltage drop of the data voltage or a voltage drop of the driving voltage of the display panel, and adjust a flicker value among the plurality of flicker values ​​based on the just noticeable difference; a still image determiner configured to determine whether the input image data is a still image or a video image; and A driving frequency determiner is configured to determine the driving frequency of the display panel using the flicker value among the plurality of flicker values ​​based on the input image data being the still image.

2. The display device according to claim 1, wherein The flicker value memory includes a plurality of flicker lookup tables, wherein the voltage drop determiner determines that a reference just noticeable difference corresponds to a first just noticeable difference according to the voltage drop of the display panel, and the driving frequency determiner is configured to determine the driving frequency using a first flicker lookup table corresponding to the first just noticeable difference, and The voltage drop determiner determines that the reference just noticeable difference corresponds to a second just noticeable difference according to the voltage drop of the display panel, and the driving frequency determiner is configured to determine the driving frequency using a second flicker lookup table corresponding to the second just noticeable difference.

3. The display device according to claim 1, wherein The voltage drop determiner is configured to set a reference just noticeable difference based on the voltage drop, and The size of the low-driving grayscale range is determined based on the reference just noticeable difference.

4. The display device according to claim 1, wherein The voltage drop determiner determines the voltage drop of the data voltage or the voltage drop of the driving voltage of the display panel by sensing a current flowing through the pixel or a current flowing through the data line.

5. The display device according to claim 1, further comprising: An ambient light determiner is configured to adjust the flicker value of the plurality of flicker values ​​based on an intensity of ambient light. The display device according to claim 5 , wherein: The ambient light determiner is configured to determine the just noticeable difference of the user according to the intensity of the ambient light, and The flicker value among the multiple flicker values ​​is adjusted according to the just noticeable difference.

7. The display device according to claim 6, wherein: The ambient light determiner is configured to set a reference just noticeable difference based on the intensity of the ambient light, and The size of the low-driving grayscale range is determined based on the reference just noticeable difference.

8. The display device according to claim 1, further comprising: A user brightness setter is configured to adjust the flicker value among the plurality of flicker values ​​based on a user brightness setting value set by the user.

9. The display device according to claim 8, wherein The user brightness setter is configured to determine the just noticeable difference of the user according to the user brightness setting value, and The flicker value among the multiple flicker values ​​is adjusted according to the just noticeable difference.

10. The display device according to claim 9, wherein The user brightness setter is configured to set a reference just noticeable difference based on the user brightness setting value, and The size of the low-driving grayscale range is determined based on the reference just noticeable difference.

11. The display device according to claim 1 , wherein the drive controller further includes a fixed frequency determiner, configured to determine the type of the input frequency of the input image data by counting the number of pulses of the horizontal synchronization signal between the first pulse and the second pulse of the vertical synchronization signal, or by counting the number of pulses of the data enable signal between the first pulse and the second pulse of the vertical synchronization signal.

12. The display device according to claim 11, wherein The fixed frequency determiner is configured to generate a frequency flag indicating the type of the input frequency of the input image data, and The driving frequency determiner is configured to determine the driving frequency of the display panel based on the frequency flag.

13. The display device according to claim 1, wherein The display panel includes a plurality of segments, and The driving controller is configured to determine the driving frequency of the display panel based on the plurality of segments. 14 . The display device according to claim 1 , further comprising a driving mode setter configured to adjust the flicker value among the plurality of flicker values ​​based on brightness of a display image according to a driving mode.

15. The display device according to claim 14, wherein The driving mode setter is configured to determine the just noticeable difference of the user according to the driving mode, and The flicker value among the multiple flicker values ​​is adjusted according to the just noticeable difference.

16. The display device according to claim 15, wherein The driving mode setter is configured to set a reference just noticeable difference based on the brightness of the display image according to the driving mode, and The size of the low-driving grayscale range is determined based on the reference just noticeable difference.

Images