Display panel and control method thereof

Abstract

According to the present application, there is provided a display panel and a driving method thereof, the driving method of the display panel including the steps of: acquiring a frequency state of the display panel; and, when the frequency state is a frequency changing state, specifying a target sub-backlight clock signal of a frame to be displayed, which has a time length equal to the reciprocal of a predetermined refresh rate of the frame to be displayed and drives emission of a backlight plate of the display panel within the time length, based on a predetermined refresh rate and a predetermined rule of the frame to be displayed.

Description

[Technical field]

[0001] The present application relates to the technical field of displays, in particular to the technical field of display panel manufacturing, and specifically to a display panel and a driving method thereof. [Background technology]

[0002] With the spread of LCD (Liquid Crystal Display) panels, VRR (Variable Refresh Rate) technology was developed to match the refresh rate of the display screen with the refresh rate of the monitor.

[0003] The display screen of the LCD panel is based on the light source provided by the backlight plate. At present, the backlight synchronization signal, whose frequency is the same as the display synchronization signal, is used to control the backlight clock signal, and the refresh rate of the normal display clock signal is used as the fixed frequency of the backlight clock signal to drive the backlight to provide the required light source for the LCD. However, the applicant has found that in FreeSync technology, the refresh rates of the screen of different frames are different, that is, the refresh rate of the backlight clock signal is larger or smaller than the refresh rate of the real-time screen, so that the light source is turned off early, causing the dark state phenomenon or screen loss, and thus degrading the quality of the screen display of the LCD panel. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a display panel and a driving method thereof to solve the technical problem that the refresh rate of a conventional backlight clock signal does not match the refresh rate of a real-time screen, causing the light source to be turned off early, resulting in a dark state phenomenon or screen loss, thereby degrading the screen display quality of an LCD panel. [Means for solving the problem]

[0005] According to an embodiment of the present application, Obtaining a frequency state of a display panel; When the frequency state is a frequency change state, a predetermined rule and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of a frame, and driving light emission of a backlight plate of the display panel within the time length; Waiting to be displayed and adjusting the target sub-backlight clock signal of the frame. Effect of the Invention

[0006] According to the present application, a display panel and a driving method thereof are provided. The driving method of the display panel includes the steps of: acquiring a frequency state of the display panel; and, when the frequency state is a frequency change state, driving the display panel according to a predetermined rule and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of a frame, and driving light emission of a backlight plate of the display panel within the time length; Waiting to be displayed and adjusting and specifying a target sub-backlight clock signal of a frame based on the predetermined refresh rate and a predetermined rule. Waiting to be displayed A target sub-backlight clock signal of a frame is identified, and a time length of the target sub-backlight clock signal is Waiting to be displayed The light emission time of the backlight plate is equal to the time required to display the frame on the screen. Waiting to be displayed It is possible to realize a time length equal to the time required for displaying a frame on the screen, Waiting to be displayedIn the screen of a frame, the light emission time of the backlight plate is short, so that the screen in the latter period is prevented from becoming dark, and the light emission time of the backlight plate is long, so that the screen to be displayed occupies the screen of the next frame, resulting in inaccurate backlighting of the screen of the next frame and causing screen loss, thereby improving the quality of the display screen of the display panel. [Brief description of the drawings]

[0007] The present application will be further described with reference to the drawings below. Note that the drawings described below are merely for the purpose of illustrating other embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without performing creative work.

[0008] [Figure 1] 2 is a flowchart of a method for driving a display panel according to an embodiment of the present application. [Diagram 2] 4A to 4C are waveform diagrams of some signals in a driving method for a display panel according to an embodiment of the present application. [Diagram 3] 1 is a waveform diagram of some signals in a conventional display panel driving method. [Figure 4] FIG. 2 is a structural block diagram of a display panel according to an embodiment of the present application. [Diagram 5] FIG. 2 is a structural block diagram of another display panel according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the technical means in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are all within the scope of protection of the present application.

[0010] The terms "first", "second", "third", etc. in this application are intended to distinguish different objects and not to describe a particular order. Also, the terms "comprise", "include", and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or modules is not limited to the steps or modules shown, and preferably further includes steps or modules not shown, or preferably further includes other steps or modules inherent to those processes, methods, products, or apparatus.

[0011] Reference to an "embodiment" in this specification means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase at each time and place in the specification does not necessarily refer to the same embodiment, nor is it an exclusive independent or alternative embodiment to other embodiments. As will be clearly and implicitly understood by those skilled in the art, the embodiments described in this specification can be combined with other embodiments.

[0012] The embodiments of the present application provide a method for driving a display panel, and the method for driving a display panel includes, but is not limited to, the following embodiments and combinations of the following embodiments.

[0013] In one embodiment, as shown in FIG. 1, the driving method for the display panel includes, but is not limited to, the following steps.

[0014] In S1, the frequency state of the display panel is obtained.

[0015] The display panel may be, but is not limited to, a liquid crystal panel. The display panel may be combined with a switch-like element to control each sub-pixel to allow the passage of light emitted from a backlight plate to show a corresponding brightness, thereby realizing brightness display in multiple sub-pixels to display a screen. In this application, multiple signals should be understood as signals loaded to any sub-pixel or the backlight corresponding to the sub-pixel. In the process of displaying a screen, the display panel can be divided into multiple frames of screen. The refresh rate of the screen of each frame may be the same or different from the refresh rate of the screen of the previous frame.

[0016] The frequency state should be understood as indicating whether the refresh rates of two adjacent frames of the screen are the same or whether the difference between the refresh rates of the screens of consecutive frames is too large in the process of the display panel displaying the screen. For example, when the display panel turns on the FreeSync function or switches the channel, the refresh rates of the screens of two adjacent frames may be different. Specifically, according to the definition of the refresh rate, that is, the number of frames of the screen displayed per second, the time length required to display the screen of each frame is the inverse of the corresponding refresh rate. That is, it should be understood that a screen with one frame having a small refresh rate has a smaller number of frames of the screen that can be displayed per second than a screen with one frame having a large refresh rate, so the time length required to display the screen of one frame with a small refresh rate is longer and the time length required to display the screen of one frame with a large refresh rate is shorter.

[0017] In S21, it is determined whether the frequency state is a frequency changing state.

[0018] Combined with the above explanation, the frequency change state refers to the screen refresh rate of two adjacent frames being different, i.e. Waiting to be displayedIt should be understood that this means that the refresh rate of a frame changes relative to the refresh rate of the currently displayed frame, or the difference between the screen refresh rates of successive frames is too large.

[0019] If the frequency state is the frequency changing state, the following S22 is executed.

[0020] In S22, the display panel Waiting to be displayed Obtain a predetermined refresh rate of the frame and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of a frame, and driving light emission of a backlight plate in the display panel within the time length; Waiting to be displayed Adjust the target sub-backlight clock signal of the frame. As can be understood, the predetermined period being the inverse of the predetermined refresh rate is not limited to the predetermined period being strictly equal to the inverse of the predetermined refresh rate, and there may be an allowable error range or difference range between the predetermined period and the inverse of the predetermined refresh rate. For example, when the predetermined refresh rate is 165 Hz, the inverse of the predetermined refresh rate is (1 / 165)s, and the predetermined period may be (1 / 165)s, (1 / 166)s, (1 / 167)s, (1 / 168)s...(1 / 174)s, (1 / 175)s, etc. The predetermined period may be slightly smaller than the inverse of the predetermined refresh rate. That is, the error range or difference range between the predetermined period and the inverse of the predetermined refresh rate may be set according to the actual situation and may be based on improving the dark state of the display.

[0021] In addition, in combination with the above description, the fact that the frequency state is a frequency change state does not limit whether the screen refresh rates of two corresponding adjacent frames are the same or whether the difference between the screen refresh rates of consecutive frames is too large. Waiting to be displayedTo emphasize that "identifying the target sub backlight clock signal of the frame" is performed by "the frequency state being the frequency change state", the two are related to each other. Waiting to be displayed It should be emphasized that whether or not "specifying a target sub-backlight clock signal of a frame" is performed depends on whether or not the frequency state is a frequency change state. Waiting to be displayed When "identifying a target sub-backlight clock signal of a frame" is executed, specifically, Waiting to be displayed Obtain a predetermined refresh rate of the frame and a predetermined rule and the display panel Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed The method may include the step of determining a target sub-backlight clock signal of a frame. In addition, as shown in FIG. 2, a plurality of sub-backlight clock signals corresponding to a screen of a plurality of frames are formed as a backlight clock signal.

[0022] The predetermined rule may be obtained in advance by simulation or experiment and stored in the display panel. The predetermined rule may include the refresh rate of the screen of the multiple frames and the sub-backlight signal of the screen of the multiple frames. Specifically, the predetermined rule may be a formula or a mapping table, but is not limited thereto. For example, when the relationship between the refresh rate of the screen of each frame and the corresponding sub-backlight signal is the same, a formula indicating the relationship between the refresh rate of the screen of each frame and the corresponding sub-backlight signal may be used as the predetermined rule. Also, for example, when the relationship between the refresh rate of the screen of each frame and the corresponding sub-backlight signal is different, a mapping table indicating the screen of each frame and the corresponding sub-backlight signal may be used. According to the above description, the higher the refresh rate of the screen of each frame, the shorter the time until the display of the screen of the frame ends, and vice versa. It should be understood that the sub-backlight signal is a signal necessary for the backlight board to supply a light source to the screen of each frame. The longer the time length of the sub-backlight signal, the longer the time length that can drive the emission of the backlight board, and vice versa. It is understood that within the time period of the sub-backlight signal, the backlight plate emits light continuously or according to a certain rule.

[0023] 3, if the refresh rate f1 of the screen F1 of the first frame, the refresh rate f2 of the screen F2 of the second frame, and the refresh rate f3 of the screen F3 of the third frame are 165 Hz, 48 Hz, and 100 Hz, respectively, the time length T1 until the display of the screen of the first frame ends, the time length T2 until the display of the screen of the second frame ends, the time length T3 until the display of the screen of the third frame ends, and the time length T4 until the display of the screen of the fourth frame ends are (1 / 165) s, (1 / 48) s, and (1 / 100) s, respectively. That is, T2 is greater than T1, and T3 is less than T2. For example, when the light emission of the backlight plate is driven at the refresh rate f1 in the screen F1 of the first frame, and when the screen F1 of the first frame is switched to the screen F2 of the second frame, the light emission of the backlight plate is driven at the refresh rate f1. The time length during which the light emission of the backlight plate is driven at the refresh rate f1 is smaller than (1 / 48)s, which is smaller than the time length T2 until the display of the screen F2 of the second frame ends, and is insufficient to support the display of the entire time length of the screen F2 of the second frame. Therefore, the screen displayed in the later time of the screen F2 of the second frame becomes dark. Similarly, when the screen F2 of the second frame is switched to the screen F3 of the third frame, and the light emission of the backlight plate is driven at the refresh rate f1, the time length during which the light emission of the backlight plate is driven at the refresh rate f1 is smaller than (1 / 100)s, which is smaller than the time length T3 until the display of the screen F3 of the third frame ends, and is insufficient to support the display of the entire time length of the screen F3 of the third frame. Therefore, the screen displayed after the screen F3 of the third frame goes dark.

[0024] Conversely, taking as an example a case where the emission of the backlight plate in the screen F2 of the second frame is driven with a refresh rate f2, and the screen F2 of the second frame is switched to the screen F3 of the third frame, and the emission of the backlight plate is driven with the refresh rate still at f2 (not shown in FIG. 3), the time length during which the emission of the backlight plate is driven with the refresh rate f2 is greater than (1 / 48)s, and the backlight duration corresponding to the screen F2 of the second frame is extended to the screen F3 of the third frame, causing the screen F3 of the third frame to be unable to accurately match its corresponding backlight, resulting in the loss of the screen F3 of the third frame, and even destruction.

[0025] As can be understood, the time length of the target sub-backlight clock signal is equal to a predetermined period, which is the inverse of the predetermined refresh rate. According to the above description, the predetermined period is: Waiting to be displayed This is the time length required to display the frame screen. In other words, the time length of the target sub-backlight clock signal is Waiting to be displayed The target sub-backlight clock signal is equal to the time length required for displaying a frame screen. The target sub-backlight clock signal is for driving the backlight plate in the display panel to emit light within the time length of the target sub-backlight clock signal. Therefore, in this embodiment, Waiting to be displayed By generating a target sub-backlight clock signal based on a predetermined refresh rate of a frame, the light emission time length of the backlight plate is Waiting to be displayed It is possible to realize that the time length is equal to the time required for displaying the screen of the frame. And Waiting to be displayed It is possible to prevent the screen of a frame from being dark in the latter period due to the short emission time of the backlight plate, and also to prevent the screen to be displayed from occupying the screen of the next frame due to the long emission time of the backlight plate, which causes the backlight of the screen of the next frame to be inaccurate and leads to screen loss, thereby improving the quality of the display screen of the display panel.

[0026] In an embodiment, step S1 includes, but is not limited to, the following steps:

[0027] In S11, the refresh rate of the sampling display frame of the display panel and the Waiting to be displayed Obtain the desired refresh rate for the frame.

[0028] Combined with the above explanation, the frequency change state is: Waiting to be displayed The frame refresh rate is changed relative to the current display frame refresh rate, or Waiting to be displayed It should be understood that the difference between the refresh rate of the frame and the refresh rate of the screen of the previous consecutive frames is too large. Therefore, the refresh rate of the sampling display frame in this embodiment is a number related to the refresh rate of the current display frame, or Waiting to be displayed It should be understood that the frame refresh rate is a number that precedes the frame refresh rate and relates to the refresh rate of the screen for a number of successive frames.

[0029] In S12, Waiting to be displayed The frequency state is identified as the frequency change state when a difference between a predetermined refresh rate of frames and a refresh rate of the sampled display frames exceeds a predetermined threshold.

[0030] in particular, Waiting to be displayed The difference between the predetermined refresh rate of the frame and the refresh rate of the sampled display frame exceeds a predetermined threshold. Waiting to be displayed It should be understood that the difference between the predetermined refresh rate of the frame and the refresh rate of the sampling display frame is too large. Waiting to be displayed The difference between the predetermined frame refresh rate and a numerical value associated with the currently displayed frame refresh rate is large, or Waiting to be displayedIf the difference between the numerical values ​​related to the screen refresh rate of the consecutive frames located before the frame refresh rate is large, it is determined that the frequency is changed. Waiting to be displayed The target sub-backlight clock signal of the frame may be adjusted according to the method in step S22.

[0031] In an embodiment, the sampling display frame includes: Waiting to be displayed The refresh rate of the sampling display frame is at least a part of a predetermined number of display frames that are located before the frame and are set consecutively. The refresh rate of the sampling display frame is the refresh rate of one display frame of the at least a part of the display frames, or is an average value of the refresh rates of at least two display frames of the at least a part of the display frames. The predetermined number is, for example, but not limited to, 1, 2, 3, 4, 5 or less. It should be noted that the predetermined number is not limited to the above number and may be adjusted according to actual conditions or needs.

[0032] As can be appreciated, the sampling display frame in this embodiment is not limited to the current display frame, Waiting to be displayed Considering at least a part of the display frames among a predetermined number of display frames that are located before the frame and are set consecutively, Waiting to be displayed It may also specify whether to adjust the target sub-backlight clock signal of the frame. The predetermined number may be reasonably limited based on factors such as the specifications of the display panel and the refresh rate range. It should be noted that the predetermined number cannot be set to be too large. Waiting to be displayed It is located in front of the frame, and Waiting to be displayed This makes it possible to prevent the refresh rate of a display frame far away from the frame from affecting the refresh rate of the current display frame.

[0033] Furthermore, the term "average" should be understood to mean the arithmetic mean or weighted mean of the refresh rates of at least two corresponding display frames. If the average is a weighted average, Waiting to be displayed The closer to the frame, the greater the weight of the refresh rate of the display frame. For example, the weight of the refresh rate of the current display frame may be the largest, and the weighted average value can comprehensively and more accurately determine the refresh rate of the sampling display frame.

[0034] In an embodiment, the sampling display frame is a current display frame, and the refresh rate of the sampling display frame is a refresh rate of the current display frame. As can be understood, according to the above description, the weight of the refresh rate of the current display frame may be the largest, and in this embodiment, only the refresh rate of the current display frame is considered, Waiting to be displayed It may be specified whether to adjust the target sub backlight clock signal of the frame. In this case, Waiting to be displayed The accuracy of specifying the target sub-backlight clock signal of a frame can be guaranteed.

[0035] According to the above description, it should be understood that the refresh rate of the current display frame is the inverse of the time until the display of the current screen is completed, and the predetermined refresh rate is the inverse of the time until the display of the screen to be displayed is completed.

[0036] According to the above description, the predetermined refresh rate is different from the refresh rate of the current display frame, that is, the time until the display of the screen to be displayed is not equal to the time until the display of the current display frame is completed. As can be understood, in combination with the description of FIG. 3 above, at this time, when the sub-backlight signal corresponding to the current display frame is used to drive the backlight plate to emit light in the screen to be displayed, the time length of the sub-backlight signal corresponding to the current display frame matches the refresh rate of the current display frame, but Waiting to be displayedThe frame refresh rate, ie, does not match the predetermined refresh rate, causing the problem of a black screen or screen loss.

[0037] Furthermore, in combination with the relevant description of step S22 above, in this embodiment, if the predetermined refresh rate is different from the refresh rate of the current display frame, Waiting to be displayed By generating a target sub-backlight clock signal based on a predetermined refresh rate of a frame, the light emission time length of the backlight plate is Waiting to be displayed It is possible to realize that the time length is equal to the time required for displaying the screen of the frame. And Waiting to be displayed It is possible to prevent the screen of a frame from being dark in the latter period due to the short emission time of the backlight plate, and also to prevent the screen to be displayed from occupying the screen of the next frame due to the long emission time of the backlight plate, which causes the backlight of the screen of the next frame to be inaccurate and leads to screen loss, thereby improving the quality of the display screen of the display panel.

[0038] In an embodiment, after performing step S1, the following steps may be included, but are not limited to these:

[0039] In S3, when the frequency state is not a frequency change state, Waiting to be displayed Identify the target sub-backlight clock signal of a frame as the sub-backlight clock signal of the currently displayed frame.

[0040] Combined with step S102, "frequency state is not 1" indicates that the predetermined refresh rate is the same as the refresh rate of the current display frame. That is, the reciprocal of the refresh rate of the current display frame is equal to the reciprocal of the predetermined refresh rate. That is, the time length until the display of the current display frame ends is Waiting to be displayedTherefore, in this embodiment, the sub-backlight clock signal of the current display frame is Waiting to be displayed By taking the frame target sub-backlight clock signal as Waiting to be displayed In a frame, the light emission time of the backlight plate is Waiting to be displayed It can realize the time required for displaying a frame, and can effectively avoid the dark state screen and screen loss.

[0041] In an embodiment, a predetermined rule and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed After performing the step of adjusting the target sub-backlight clock signal of the frame, the step may include, but is not limited to, the following steps.

[0042] In S4, the display panel Waiting to be displayed a target subframe synchronization signal for the frame; Waiting to be displayed A target data signal that controls the brightness of the frame is obtained.

[0043] As shown in FIG. 2, the screen of each frame may have a corresponding sub-frame synchronization signal. Each sub-frame synchronization signal may be understood to include a first pulse. Furthermore, a plurality of sub-frame synchronization signals corresponding to the screens of consecutive frames are connected to each other to form a frame synchronization signal. Each first pulse triggers displaying a corresponding one frame screen based on the sub-data signal, and forms a plurality of sub-data signals corresponding to the screens of the multiple frames as a data signal. Furthermore, the specific display manner of the screen of each frame may be understood to be that after each first pulse in the frame synchronization signal, the screen of the corresponding one frame displays a screen corresponding to the sub-data signal at a corresponding refresh rate. That is, the time length required for displaying the screen of each frame is the reciprocal of the corresponding refresh rate.

[0044] In S5, based on the target subframe synchronization signal and the target sub-backlight clock signal, the backlight plate is driven to emit light within the time length of the target sub-backlight clock signal, and based on the target subframe synchronization signal and the target data signal, the sub-pixels are driven to display a screen when the backlight emits light.

[0045] Step S22, in combination with step S4, results in a corresponding pulse in the target sub-frame data signal at a predetermined refresh rate after the first pulse in the target sub-frame sync signal. Waiting to be displayed Display the frame, i.e. Waiting to be displayed The time length required to display a frame is a predetermined period. Furthermore, in this embodiment, a target sub backlight clock signal is generated based on the position of the first pulse in the target sub frame synchronization signal, and the backlight plate is timely driven to emit light within the time length of the target sub backlight clock signal. Specifically, as shown in FIG. 2, for ease of understanding, the screen F2 of the second frame is Waiting to be displayed For example, after the first pulse in the screen F2 of the second frame, a target sub-backlight clock signal is generated, and the backlight plate is driven to emit light within a time required for displaying the screen F2 of the second frame, so that the emission of the backlight plate continues from the start time of the screen F2 of the second frame to the end time of the screen F2 of the second frame, and the sub-pixels are driven to display the screen when the backlight plate emits light based on the target data signal. Waiting to be displayed Display the frame.

[0046] In an embodiment, a predetermined rule and Waiting to be displayed Based on a given refresh rate of the frame Waiting to be displayed After performing the step of adjusting the target sub-backlight clock signal of the frame, the step may include, but is not limited to, the following steps.

[0047] In S6, Waiting to be displayed Get the target backlight duty ratio for the frame.

[0048] Specifically, the screen of each frame may have a backlight duty ratio. The backlight duty ratio is understood to be the ratio of the backlight emission time of the screen of each frame to the unit backlight time. The larger the backlight duty ratio, the larger the luminance required for the screen of the corresponding one frame and the larger the luminance finally displayed, so here, the target backlight duty ratio may indicate the luminance required for the screen to be displayed and the luminance finally displayed.

[0049] In S7, a target sub-backlight modulation signal for driving the emission of the backlight plate within the time length of the target sub-backlight clock signal is generated based on the target sub-backlight clock signal and the target backlight duty ratio.

[0050] Specifically, in combination with the above description and FIG. 2, when a frame synchronization signal is specified, a plurality of sub-frame synchronization signals, each of which includes a plurality of first pulses and is triggered to display a screen of a plurality of frames, are correspondingly specified. A sub-backlight clock signal is driven to generate a sub-backlight modulation signal required for the screen of each frame in combination with a backlight duty ratio. The backlight plate is driven to emit light in the screen of the corresponding one frame. Similarly, a target sub-backlight clock signal is driven to generate a sub-backlight modulation signal required for the screen of each frame in combination with a target backlight duty ratio. Waiting to be displayed Generates the target sub-backlight modulation signal required for the frame. The backlight plate Waiting to be displayed The backlight is driven to emit light in a plurality of frames. Furthermore, as shown in Fig. 2, a plurality of sub-backlight modulation signals for a plurality of frames of the screen are combined to form a backlight modulation signal. Finally, the backlight is driven to emit light in a plurality of frames of the screen by the backlight modulation signal.

[0051] In this embodiment, the waveform of the sub-backlight clock signal is not limited, and in combination with the above description, it is sufficient that the backlight plate emits light continuously or according to a certain rule within the time length of the sub-backlight clock signal. Specifically, this can be achieved by rationally setting the waveform of the sub-backlight clock signal and the specific manner in which the sub-backlight clock signal drives the emission of the backlight plate. For example, as shown in FIG. 2, the backlight clock signal of each unit may include at least one second pulse, and each second pulse may correspond to a unit backlight time. That is, each second pulse may correspond to a corresponding unit Backlight An overlap unit may be formed with a corresponding backlight duty ratio as a trigger within a time period.

[0052] In an embodiment, step S6 may include, but is not limited to, the following steps:

[0053] In the S601, Waiting to be displayed Controlling the brightness of the frame Waiting to be displayed Acquire a data signal of a frame, and Waiting to be displayed The target backlight duty ratio is generated based on a data signal of a frame.

[0054] As can be understood, the backlight duty ratio of the screen in each frame may be associated with a corresponding data signal. In combination with the above description, if the data signal is Waiting to be displayed To control the brightness of a frame, the data signal may indicate the brightness required for the corresponding screen of one frame. The larger the backlight duty ratio, the larger the brightness required for the corresponding screen of one frame, and the larger the brightness finally displayed. Waiting to be displayed The data signal of the frame is Waiting to be displayed The data signal may indicate the required brightness for the frame. Therefore, in this embodiment, by specifying the corresponding backlight duty ratio by the data signal, the similarity between the required brightness and the final brightness of the corresponding screen of one frame can be improved, and the quality of the display screen of the display panel can be further improved.

[0055] According to embodiments of the present application, a display panel is provided, including but not limited to the following embodiments and combinations of the following embodiments.

[0056] In an embodiment, as shown in Figures 4 and 5, a display panel 100 includes a light-emitting backlight plate 101, a backlight control chip 102 electrically connected to the backlight plate 101, and a backlight driving chip 103. The backlight control chip 102 obtains a frequency state of the display panel. When the frequency state is a frequency change state, the backlight driving chip 103 drives the backlight driving chip 103 according to a predetermined rule and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of a frame, and driving light emission of the backlight plate of the display panel within the time length; Waiting to be displayed Adjust the target sub-backlight clock signal of a frame. The backlight control chip 102 is integrated into the backlight driving chip 103, or the backlight control chip 102 and the backlight driving chip 103 are provided separately.

[0057] For the relevant functions of the backlight control chip 102 and the backlight driving chip 103, please refer to the relevant description of the display panel driving method. In addition, in combination with the above description, as shown in Figures 3 and 4, the backlight control chip 102 stores a predetermined rule, and based on the predetermined refresh rate and the predetermined rule, Waiting to be displayed The target sub-backlight clock signal of the frame can be determined and sent to the backlight driving chip 103 to drive the emission of the backlight plate 101. Specifically, in this embodiment, the integration method of the backlight control chip 102 and the backlight driving chip 103 is not limited as long as the above-mentioned signal transmission and signal processing can be realized between the backlight control chip 102 and the backlight driving chip 103.

[0058] In an embodiment, as shown in FIG. 3 and FIG. 4, the backlight control chip 102 determines the refresh rate of the sampling display frame of the display panel and the Waiting to be displayed Then, the backlight control chip 102 obtains a predetermined refresh rate of the frame. Waiting to be displayed The frequency state is identified as the frequency change state when a difference between a predetermined refresh rate of frames and a refresh rate of the sampled display frames exceeds a predetermined threshold.

[0059] For how the backlight control chip 102 sets the frequency state, please refer to the relevant description of step S102 above. Furthermore, the backlight control chip 102 may obtain a conclusion whether the refresh rate of the current display frame of the display panel is the same as the predetermined refresh rate.

[0060] In an embodiment, as shown in FIG. 3, the backlight control chip 102 is integrated in the backlight driving chip 103, and the backlight plate 101 and the backlight driving chip 103 are provided separately. Or, as shown in FIG. 4, the backlight control chip 102 and the backlight driving chip 103 are provided separately, and the backlight driving chip 103 is integrated in the backlight plate 101. It can be understood that the structure of FIG. 3 is faster than the structure of FIG. 4 in that the backlight control chip 102 is integrated in the backlight driving chip 103, and therefore the data transmission and exchange speed between them is increased. The structure of FIG. 4 is faster than the structure of FIG. 3 in that the backlight driving chip 103 is integrated in the backlight plate 101, and therefore the data transmission speed of the backlight driving chip 103 to the backlight plate 101 is increased.

[0061] In an embodiment, as shown in Figures 3 and 4, the display panel 100 further includes a liquid crystal panel 104 located on the emission side of the backlight plate 101, and a timing control chip 105 electrically connected to the backlight control chip 102, the backlight driving chip 103 and the liquid crystal panel 104, and transmitting the frequency state to at least one of the backlight control chip 102 and the backlight driving chip 103 to drive the emission of the backlight plate, and transmitting scanning data signals and display data signals to the liquid crystal panel 104 so as to drive the deflection of the liquid crystal molecules of the liquid crystal.

[0062] Specifically, the timing control chip 105 can send a frequency state, a frame synchronization signal, and a data signal to the backlight control chip 102, and can send a plurality of backlight duty ratios to the backlight driving chip 103. The backlight control chip 102 can generate a backlight clock signal and send it to the backlight driving chip 103. Furthermore, the backlight driving chip 103 can generate a backlight modulation signal according to the plurality of backlight duty ratios and the backlight clock signal, and input it to the backlight plate 101 to drive the light emission of the backlight plate 101. Specifically, the timing control chip 105 can send a scan data signal to the gate driving circuit in the liquid crystal panel 104, and can send a display data signal to the source driving circuit in the liquid crystal panel 104. Furthermore, the gate driving circuit forms a plurality of gate signals after processing the scan data signal, and causes each gate signal to be loaded to a corresponding plurality of sub-pixels. The source driving circuit processes the display data signal to form a plurality of data signals, and causes each data signal to be loaded to a corresponding sub-pixel.

[0063] 3 and 4, the display panel 100 may further include a system-on-chip 106 electrically connected to the timing control chip 105. In this case, the system-on-chip 106 sends an image input protocol and an image signal to the timing control chip 105, so that the timing control chip 105 processes the image signal according to the image input protocol to form, but is not limited to, a frequency state, a frame synchronization signal, a scan data signal and a display data signal.

[0064] The present application provides a display panel and a driving method thereof, the driving method of the display panel including the steps of obtaining a frequency state of the display panel, and when the frequency state is a frequency change state, determining whether the frequency state is a frequency change state based on a predetermined rule and Waiting to be displayed Based on the given refresh rate of the frame, Waiting to be displayed a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of a frame, and driving light emission of a backlight plate in the display panel within the time length; Waiting to be displayed and adjusting and specifying a target sub-backlight clock signal of a frame based on the predetermined refresh rate and a predetermined rule. Waiting to be displayed By identifying the target sub-backlight clock signal of a frame, the time length of the target sub-backlight clock signal is Waiting to be displayed The light emission time of the backlight plate is equal to the time required to display the frame on the screen. Waiting to be displayed It is possible to realize that the time length is equal to the time required for displaying the screen of the frame. And Waiting to be displayed It is possible to prevent the screen of a frame from being dark in the latter period due to the short emission time of the backlight plate, and also to prevent the screen to be displayed from occupying the screen of the next frame due to the long emission time of the backlight plate, which causes the backlight of the screen of the next frame to be inaccurate and leads to screen loss, thereby improving the quality of the display screen of the display panel.

[0065] The above provides a detailed description of the display panel and the driving method thereof according to the embodiments of the present application, and the present specification uses specific examples to explain the principles and embodiments of the present application. However, the above description of the embodiments is merely for the purpose of easily understanding the technical means and core ideas of the present application, and it should be understood that a person skilled in the art may still modify the technical means described in each of the above embodiments or make equivalent substitutions to some of the technical features, and such modifications or substitutions do not deviate from the essence of the corresponding technical means within the scope of the technical means of each of the embodiments of the present application.

Claims

1. Obtaining a frequency state of a display panel; and when the frequency state is a frequency change state, adjusting a target sub-backlight clock signal of a frame to be displayed based on a predetermined rule and a predetermined refresh rate of the frame to be displayed, the target sub-backlight clock signal having a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of the frame to be displayed and driving light emission of a backlight plate of the display panel within the time length; A plurality of sub-backlight clock signals corresponding to a plurality of frames of screens are formed as a backlight clock signal, each of the sub-backlight clock signals includes at least one second pulse, each of the second pulses corresponds to a unit backlight time, and is triggered within the corresponding unit backlight time to form an overlapping unit with a corresponding backlight duty ratio, each frame of the screen has the backlight duty ratio, and the backlight duty ratio is a proportion of the corresponding backlight emission time in the unit backlight time in the frame of the screen, the target sub-backlight clock signal is the sub-backlight clock signal of the frame to be displayed, and the target sub-backlight clock signal is generated by triggering based on a position of a first pulse in a target sub-frame synchronization signal; The frequency change state refers to the refresh rate of the display queue being changed relative to the refresh rate of the current display frame, or the difference between the refresh rates of the screens of a plurality of consecutive frames is too large; The step of acquiring a frequency state of the display panel includes: obtaining a refresh rate of a sampling display frame of the display panel and a predetermined refresh rate of the frame to be displayed, the sampling display frame being located before the frame to be displayed and being at least a part of a predetermined number of consecutive display frames; identifying the frequency state as the frequency changing state when a difference between a predetermined refresh rate of the frames to be displayed and a refresh rate of the sampled display frames exceeds a predetermined threshold; After performing the step of obtaining the frequency state of the display panel, determining, when the frequency state is not a frequency change state, that the target sub-backlight clock signal of the frame to be displayed is the sub-backlight clock signal of the currently displayed frame; A method for driving a display panel.

2. the refresh rate of the sampling display frames is a refresh rate of one display frame of at least the portion of the display frames, or is an average of refresh rates of at least two display frames of at least the portion of the display frames; A method for driving a display panel according to claim 1.

3. the sampling display frame is a current display frame; The refresh rate of the sampling display frame is the refresh rate of the current display frame. A method for driving a display panel according to claim 2.

4. After performing the step of adjusting the target sub-backlight clock signal of the frame to be displayed according to the predetermined rule and the predetermined refresh rate of the frame to be displayed, obtaining a target subframe synchronization signal corresponding to a frame to be displayed on the display panel and a target data signal for controlling the brightness of the frame to be displayed; driving the backlight panel to emit light within a time length of the target sub-backlight clock signal based on the target sub-frame synchronization signal and the target sub-backlight clock signal, and driving sub-pixels to display a screen when the backlight panel emits light based on the target sub-frame synchronization signal and the target data signal. A method for driving a display panel according to claim 1.

5. After performing the step of adjusting the target sub-backlight clock signal of the frame to be displayed according to the predetermined rule and the predetermined refresh rate of the frame to be displayed, obtaining a target backlight duty ratio for a frame to be displayed; generating a target sub-backlight modulation signal based on the target sub-backlight clock signal and the target backlight duty ratio, the target sub-backlight modulation signal driving the emission of the backlight panel within a time length of the target sub-backlight clock signal; A method for driving a display panel according to claim 1.

6. The step of obtaining a target backlight duty ratio for a frame to be displayed includes: obtaining a target data signal of a frame to be displayed, the target data signal controlling the luminance of the frame to be displayed; and generating the target backlight duty ratio based on the target data signal of the frame to be displayed; A method for driving a display panel according to claim 5.

7. Obtaining a frequency state of a display panel; and when the frequency state is a frequency change state, adjusting a target sub-backlight clock signal of a frame to be displayed based on a predetermined rule and a predetermined refresh rate of the frame to be displayed, the target sub-backlight clock signal having a time length equal to a predetermined period that is the reciprocal of the predetermined refresh rate of the frame to be displayed and driving light emission of a backlight plate of the display panel within the time length; A plurality of sub-backlight clock signals corresponding to a plurality of frames of screens are formed as a backlight clock signal, each of the sub-backlight clock signals includes at least one second pulse, each of the second pulses corresponds to a unit backlight time, and is triggered within the corresponding unit backlight time to form an overlapping unit with a corresponding backlight duty ratio, each frame of the screen has the backlight duty ratio, and the backlight duty ratio is a proportion of the corresponding backlight emission time in the unit backlight time in the frame of the screen, the target sub-backlight clock signal is the sub-backlight clock signal of the frame to be displayed, and the target sub-backlight clock signal is generated by triggering based on a position of a first pulse in a target sub-frame synchronization signal; The frequency change state refers to the refresh rate of the display queue being changed relative to the refresh rate of the current display frame, or the difference between the refresh rates of the screens of consecutive frames being too large; A method for driving a display panel.

8. The step of acquiring a frequency state of the display panel includes: obtaining a refresh rate of a sampling display frame of the display panel and a predetermined refresh rate of the frame to be displayed, the sampling display frame being located before the frame to be displayed and being at least a part of a predetermined number of consecutive display frames; identifying the frequency state as the frequency changing state when a difference between a predetermined refresh rate of the frames to be displayed and a refresh rate of the sampled display frames exceeds a predetermined threshold. The display panel driving method according to claim 7.

9. the refresh rate of the sampling display frames is a refresh rate of one display frame of at least a portion of the display frames, or is an average of refresh rates of at least two display frames of at least a portion of the display frames; The display panel driving method according to claim 8.

10. the sampling display frame is a current display frame; The refresh rate of the sampling display frame is the refresh rate of the current display frame. The display panel driving method according to claim 9 .

11. After performing the step of acquiring the frequency state of the display panel, determining, when the frequency state is not a frequency change state, that the target sub-backlight clock signal of the frame to be displayed is the sub-backlight clock signal of the currently displayed frame; The display panel driving method according to claim 7.

12. After performing the step of adjusting the target sub-backlight clock signal of the frame to be displayed according to the predetermined rule and the predetermined refresh rate of the frame to be displayed, obtaining a target subframe synchronization signal corresponding to a frame to be displayed on the display panel and a target data signal for controlling the brightness of the frame to be displayed; driving the backlight panel to emit light within a time length of the target sub-backlight clock signal based on the target sub-frame synchronization signal and the target sub-backlight clock signal, and driving sub-pixels to display a screen when the backlight panel emits light based on the target sub-frame synchronization signal and the target data signal. The display panel driving method according to claim 7.

13. After performing the step of adjusting the target sub-backlight clock signal of the frame to be displayed according to the predetermined rule and the predetermined refresh rate of the frame to be displayed, obtaining a target backlight duty ratio for a frame to be displayed; generating a target sub-backlight modulation signal based on the target sub-backlight clock signal and the target backlight duty ratio, the target sub-backlight modulation signal driving the emission of the backlight panel within a time length of the target sub-backlight clock signal; The display panel driving method according to claim 7.

14. The step of obtaining a target backlight duty ratio for a frame to be displayed includes: obtaining a target data signal of a frame to be displayed, the target data signal controlling the luminance of the frame to be displayed; and generating the target backlight duty ratio based on the target data signal of the frame to be displayed; The method for driving the display panel according to claim 13.

15. A display panel including a light-emitting backlight plate, a backlight control chip electrically connected to the backlight plate, and a backlight driving chip, The backlight control chip obtains a frequency state of the display panel; When the frequency state is a frequency change state, the backlight driving chip adjusts, according to a predetermined rule and a predetermined refresh rate of a frame to be displayed, a target sub-backlight clock signal of the frame to be displayed, which has a time length equal to a predetermined period, which is an inverse of the predetermined refresh rate of the frame to be displayed, and drives the backlight plate of the display panel to emit light within the time length; The backlight control chip is integrated into the backlight driving chip; Alternatively, the backlight control chip and the backlight driving chip are provided separately; The backlight driving chip is used in such a manner that a plurality of sub-backlight clock signals corresponding to a plurality of frames of screens are formed as a backlight clock signal, each of the sub-backlight clock signals includes at least one second pulse, each of the second pulses corresponds to a unit backlight time, and is triggered within the corresponding unit backlight time to form an overlapping unit with a corresponding backlight duty ratio, each frame of the screen has the backlight duty ratio, and the backlight duty ratio is a proportion of the corresponding backlight emission time in the unit backlight time in the frame of the screen; the target sub-backlight clock signal is the sub-backlight clock signal of the frame to be displayed, and the target sub-backlight clock signal is generated by triggering based on a position of a first pulse in a target sub-frame synchronization signal; The frequency change state refers to the refresh rate of the display queue being changed relative to the refresh rate of the current display frame, or the difference between the refresh rates of the screens of consecutive frames being too large; Display panel.

16. the backlight control chip obtains a refresh rate of a sampling display frame of the display panel and a predetermined refresh rate of the frame to be displayed, the sampling display frame is located before the frame to be displayed and is at least a part of a predetermined number of display frames set consecutively, and when a difference between the predetermined refresh rate of the frame to be displayed and the refresh rate of the sampling display frame exceeds a predetermined threshold, the frequency state is determined to be the frequency change state; The display panel according to claim 15.

17. The backlight driving chip determines that the target sub-backlight clock signal of the frame to be displayed is the sub-backlight clock signal of the currently displayed frame when the frequency state is not a frequency change state; The display panel according to claim 15.

18. The backlight driving chip includes: Obtaining a target subframe synchronization signal corresponding to a frame to be displayed on the display panel and a target data signal for controlling the brightness of the frame to be displayed; driving the backlight panel to emit light within a time length of the target sub-backlight clock signal based on the target sub-frame synchronization signal and the target sub-backlight clock signal, and driving sub-pixels to display a screen when the backlight panel emits light based on the target sub-frame synchronization signal and the target data signal; The display panel according to claim 15.

19. The backlight control chip is integrated into the backlight driving chip, and the backlight plate and the backlight driving chip are provided separately; Or, the backlight control chip and the backlight driving chip are provided separately, and the backlight driving chip is integrated in the backlight plate; The display panel according to claim 15.

20. a liquid crystal panel located on the light emission side of the backlight plate; a timing control chip electrically connected to the backlight control chip, the backlight driving chip and the liquid crystal panel, for transmitting the frequency state to at least one of the backlight control chip and the backlight driving chip to drive the light emission of the backlight plate, and for transmitting a scan data signal and a display data signal to the liquid crystal panel so as to drive the deflection of liquid crystal molecules of the liquid crystal. The display panel according to claim 15.

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