Display control method, display device and readable storage medium

Abstract

The invention provides a display control method, a display device and a readable storage medium. The display control method is applied to the display device, the display device comprises a liquid crystal display panel, and the display control method is characterized by comprising the following steps: acquiring an input video signal; detecting whether the video signal comprises a target segment, the target segment being a periodic asymmetric signal whose gray scale difference is greater than a preset gray scale threshold and taking an even frame as a period; under the condition that the input video signal comprises the target segment, a target frame image of the target segment is copied, the copied target image frame is inserted into the target segment, the updated video signal is obtained, and the target image frame is part or all of the image frame in the target segment; and displaying an image according to the updated video signal. According to the embodiment of the invention, the possibility of afterimage can be reduced, and the display effect is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display control method, a display device, and a readable storage medium. Background Art

[0002] Video afterimage refers to the phenomenon where, after playing a dynamic video for a period of time and then switching to another screen, some residual and flickering parts of the original dynamic video can still be seen in a local area of the switched screen (or on the entire display). Liquid crystal display panels operate by applying different bias voltages via electrodes to control the degree of deflection of liquid crystal molecules. However, in actual use, due to the characteristics of the displayed image, the liquid crystal molecules may be biased for a long time and unable to recover in time, which may cause afterimages and affect the display quality. Summary of the Invention

[0003] Embodiments of the present invention provide a display control method, a display device, and a readable storage medium to solve the problem that existing display devices may produce afterimages and affect display effects.

[0004] To solve the above problems, the present invention is achieved as follows:

[0005] In a first aspect, an embodiment of the present invention provides a display control method, applied to a display device, wherein the display device includes a liquid crystal display panel, the method comprising:

[0006] Get the input video signal;

[0007] detecting whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal with a grayscale difference greater than a preset grayscale threshold and an even frame period;

[0008] When the input video signal includes the target segment, copying a target frame image of the target segment and inserting the copied target image frame into the target segment to obtain an updated video signal, wherein the target image frame is part or all of the image frames in the target segment;

[0009] An image is displayed according to the updated video signal.

[0010] In some embodiments, copying the target frame image of the target segment and inserting the copied target image frame into the target segment to obtain the updated video signal includes:

[0011] Selecting the dth frame image from the a-frame image of the target segment as the target frame image, where a is an even number greater than 2, and d is a positive integer less than or equal to a;

[0012] The target frame image is copied, and the copied image frame is inserted after the original target frame image to obtain the updated video signal including the a+b frame images.

[0013] In some embodiments, b is an odd number, b is not an odd multiple of T / 2, and b is not an odd multiple of a factor of n, where T is the period of the target segment.

[0014] In some embodiments, the target frame image is a partial image frame of the target segment;

[0015] The copying of the target frame image of the target segment and inserting the copied target image frame into the target segment to obtain the updated video signal includes:

[0016] The target frame image of the target segment is copied, and N copied image frames are inserted after the original image frame to obtain the updated video signal including a+b frame images, where N is an integer greater than or equal to 1.

[0017] In some embodiments, after obtaining the updated video signal, the method further includes:

[0018] The refresh frequency of the video signal is adjusted according to the number of the copied and inserted target image frames and the number of original image frames of the target segment.

[0019] In some embodiments, the preset grayscale threshold is greater than or equal to 50% of the grayscale range of the liquid crystal display panel.

[0020] In a second aspect, an embodiment of the present application provides a display device, including a liquid crystal display panel, including:

[0021] An input module, used for obtaining an input video signal;

[0022] a detection module, configured to detect whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal having a grayscale difference greater than a preset grayscale threshold and an even frame period;

[0023] an image updating module, configured to, when the input video signal includes the target segment, copy a target frame image of the target segment and insert the copied target image frame into the target segment to obtain an updated video signal;

[0024] The display control module is configured to display an image according to the updated video signal.

[0025] In some embodiments, further comprising:

[0026] a frequency adjustment module, configured to adjust the refresh frequency of the video signal according to the number of copied and inserted target image frames and the number of original image frames of the target segment;

[0027] The frequency adjustment module is set at any of the following locations:

[0028] a logic board Tcon IC integrated into the display device;

[0029] A system on chip (SOC) integrated into the display device;

[0030] It is independently arranged and connected between the logic board Tcon IC and the source driver chip Source IC of the display device.

[0031] In a third aspect, an embodiment of the present invention provides a display device comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the display control method as described in any one of the first aspects.

[0032] In a fourth aspect, an embodiment of the present invention provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the display control method as described in any one of the first aspects are implemented.

[0033] The display control method provided by an embodiment of the present invention, in the case of a target segment including a periodic asymmetric signal with a grayscale difference greater than a preset grayscale threshold and an even frame period, inserts an image frame into the target segment to adjust it to a symmetrical signal, thereby preventing the liquid crystal molecules from maintaining a fixed posture for a long time, reducing the possibility of afterimages, and improving the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 It is a schematic diagram of a video afterimage;

[0036] Figure 2 This is another schematic diagram of a video afterimage;

[0037] Figure 3 1 is a waveform diagram of a source output signal according to an embodiment of the present invention;

[0038] Figure 4is a flow chart of a display control method according to an embodiment of the present invention;

[0039] Figure 5 1 is a schematic diagram of an even-frame periodic asymmetric signal waveform in one embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of a symmetrical signal waveform after adjustment in one embodiment of the present invention;

[0041] Figure 7 It is a flowchart of a display control method in the related art;

[0042] Figure 8 is a flow chart of another display control method in one embodiment of the present invention;

[0043] Figure 9 The waveform of the rolling news video source Sout after adjustment in one embodiment of the present application;

[0044] Figure 10 is a flow chart of another display control method in one embodiment of the present invention;

[0045] Figure 11 is a flow chart of another display control method in one embodiment of the present invention;

[0046] Figure 12 FIG. 1 is a structural diagram of a display device in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] The terms "first", "second" etc. in the embodiments of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products or equipment. In addition, "and / or" is used in this application to represent at least one of the connected objects, for example A and / or B and / or C, which means comprising 7 situations including single A, single B, single C, and both A and B exist, both B and C exist, both A and C exist, and both A, B and C exist.

[0049] Video afterimage refers to the phenomenon that after playing a dynamic video for a period of time, after switching to another screen, some residual and flickering of the original dynamic video can still be seen in a local area of the switched screen (or on the entire display screen).

[0050] like Figure 1 As shown, Figure 1 When playing video on a game console using a VRR (Variable Refresh Rate)-enabled SOC (System on Chip), after a period of time on a specific game screen, the screen switches to grayscale, such as L63 or L127. Visible image retention and flickering can be seen on the originally selected screen. Testing has found that the longer the screen remains on grayscale, the more severe the video afterimage.

[0051] Figure 1 The left picture is the level selection interface of the game. The yellow-green octagonal box in the interface is in a periodic light and dark flashing state; the central box is composed of many small squares, each with a different color, and the color inside it also shows a periodic light and dark flashing state. If you stay in this interface for more than 10 minutes without performing any operation, and then switch to the L63 screen, you can see that the original interface remains, the effect is as follows Figure 1 As shown in the image on the right, the original level selection screen's octagonal box and the borders of the small squares within the central box remain clearly visible. Furthermore, flickering is observed within and around the outlined area. Afterward, by remaining on the L63 screen for a while, or switching to other dynamic videos without obvious periodicity for a while, and then switching back to the L63 screen, the remaining outlines and flickering of the original interface are reduced or even eliminated.

[0052] like Figure 2 As shown in Figure 2, a product is used to display a scrolling news bar. The test video source has a frame rate of 50FPS (frames per second). The video source is processed by the SOC and displayed on the LCD panel at a refresh rate of 50Hz. In the video, there is a scrolling news bar near the bottom of the screen. The news bar has black text on a white background. During the video playback, the black text continuously moves to the left, displaying several news items in a circular scrolling manner. After testing, it was found that after the video plays for 10 minutes, it switches to the menu screen or the L127 grayscale screen, and it can be seen that the black text near the bottom of the news bar in the original video ( Figure 2 The position indicated by the purple box is approximately equivalent to the third line of the English four-line grid. The black and white pixels at this position change most frequently. There are serious flickering horizontal lines. Figure 2The two images on the right show the problem on the menu screen and L127 screen respectively (only the horizontal lines remain in the images, but they are actually flickering). The flickering lines can be reduced or even eliminated by playing the menu screen or L127 screen, or by turning off the power.

[0053] Video afterimages are caused by asymmetric signal inputs between positive and negative frames at certain pixels, resulting in residual DC voltage at those locations. To prevent polarization caused by a prolonged bias voltage across the liquid crystal molecules (LC), LCDs (Liquid Crystal Displays) use an alternating positive and negative voltage drive system.

[0054] Specifically, if a frame is driven by a positive voltage, the frame is called a positive frame; if it is driven by a negative voltage, the frame is called a negative frame. The positive and negative voltages here are relative to the common electrode VCOM voltage. The driving voltage higher than VCOM is a positive voltage, and the driving voltage lower than VCOM is a negative voltage. When the positive and negative frame voltages are generally symmetrical relative to VCOM, no DC bias will be formed at both ends of the LC; but when the positive and negative frame voltages are asymmetrical, in order to balance the built-in electric field, a DC bias, namely DC residue, will be generated at both ends of the LC. When the screen is switched when there is DC residue at both ends of the LC, the bias voltage will not disappear immediately, and the LC will remain in a biased state for a period of time. The pixels at the corresponding position will have brightness differences and flicker compared to the pixels at other positions.

[0055] by Figure 2 Taking the flickering horizontal lines in the video source of a scrolling news strip with black text on a white background as an example, the black text inside the white background appears in a cyclic scrolling pattern. For the pixels at the flickering horizontal lines, they change rapidly between black and white, with large grayscale differences and frequent changes.

[0056] See also Figure 3 , Figure 3 This figure illustrates the waveform of the Sout signal (source output signal) input to the pixels on the OC surface under the video source. In the figure, the signal waveform within the white bar position (the waveform between the two white vertical lines) of four consecutive frames (marked as the Nth Frame, (N+1)th Frame, (N+2)th Frame, and (N+3)th Frame in the figure) is partially enlarged, and the position within the dotted box corresponds to the position where the flickering horizontal line occurs.

[0057] Depend on Figure 3 It can be seen that the signal at the location where the flickering horizontal line occurs is negative black, positive white, negative black, and positive white for four consecutive frames. Multiple tests of the data signal at this white bar location show that the flickering horizontal line location has more positive white and negative black frames, and fewer negative white and positive black frames. This is due to the asymmetry between the positive and negative frame signals. This condition generates a forward bias voltage on the LC at the corresponding location, resulting in residual and flickering after switching between images.

[0058] Normally, the video source content has no obvious regularity. Therefore, although the positive and negative frames of the pixel display content are asymmetric, the DC residual will not be biased in one direction all the time (always positive bias or always negative bias). In addition, LC has a certain ability to release DC residual. As a result, the problem of video afterimage will not occur.

[0059] However, when the OC refresh rate matches the video source frame rate, it's difficult to ensure complete symmetry between positive and negative frames, as each frame displayed by the OC is likely to be different. If asymmetric signals with large and frequently changing grayscales appear on pixels in certain locations, image retention can easily occur after switching between frames.

[0060] According to the principle of bias voltage generation, when the input signal is asymmetrical, the greater the grayscale difference between the positive and negative frames, the greater the bias. When the bias is always in one direction, the more frequent the signal changes, the greater the bias. Therefore, asymmetrical signals with large grayscale differences and frame periodicity are more likely to cause video afterimages.

[0061] Today, with the advancement of display technology, a wide variety of high-end display products with VRR capabilities are emerging, and various high-frame-rate video sources are becoming widely used. In these products, the OC refresh rate is consistent with the video source frame rate, and the content of each frame of the video source often varies. As a result, the incidence of video retention is increasing.

[0062] An embodiment of the present invention provides a display control method applied to a display device, wherein the display device includes a liquid crystal display panel.

[0063] like Figure 4 As shown, in one embodiment, the method includes:

[0064] Step 401: Acquire an input video signal.

[0065] Step 402: Detect whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal with a grayscale difference greater than a preset grayscale threshold and an even frame period.

[0066] From the above analysis, we can see that asymmetric signals with large grayscale differences and periodicity are more likely to cause video afterimage problems. Here, periodic signals can be divided into periodic signals with odd frames as the period and periodic signals with even frames as the period.

[0067] Assume that the signal frame period of the asymmetric signal is T. Since the panel display alternates between positive and negative frames, when T is an odd number, the signal is a symmetrical signal with a period of 2T for the panel display. In this case, it is not easy to form a bias voltage and the video afterimage problem is not likely to occur. When T is an even number, the asymmetric signal will not be symmetrical due to the alternating display of positive and negative frames. In this case, the bias voltage will continue to accumulate with the increase of the display period, so the video afterimage problem is likely to occur.

[0068] As shown in Table 1, taking frame periods T=2 and T=3 as examples, the symmetry of periodic signals with even frames as periods and periodic signals with odd frames as periods displayed within the plane are respectively shown.

[0069] Table 1: Examples of symmetry cases for periodic signals

[0070]

[0071] In Table 1, the panel displays positive and negative frames alternately, that is, the first frame is "+", the second frame is "-", the third frame is "+", the fourth frame is "-", and so on.

[0072] In the case of T=2 in the table, the signal input to the panel pixel from the front end is a cycle of L255 and L0, and is displayed on the panel as a cycle of +L255 and -L0. For the panel pixel, the input signal is still an asymmetric signal with a period of two frames, and a positive bias voltage is generated in each signal period.

[0073] In the case of T=3 in the table, the signal input to the panel from the front end is a cycle of L255, L0 and L127, and displayed on the panel is a cycle of +L255, -L0, +L127, -L255, +L0, -L127; for the panel pixels, the input signal is a symmetrical signal with a period of six frames, and no bias voltage is generated within each signal period.

[0074] An asymmetric signal with large grayscale difference and even frame periodicity, such as the case where L255 and L0 appear alternately in a two-frame cycle as mentioned above, acts on a certain pixel area, and the area is periodically displayed with positive frame white and negative frame black (or negative frame white and positive frame black).

[0075] Figure 5 The signal waveform is shown with alternating positive white frames and negative black frames. This signal has poor symmetry with respect to the common electrode VCOM, which can easily cause voltage offset and DC residual at the corresponding pixel position, resulting in video afterimage issues.

[0076] Therefore, in this embodiment, it is necessary to detect whether there is a periodic asymmetric signal with a large grayscale difference and an even-numbered frame period in the input video signal.

[0077] Based on the above analysis, it can be seen that DC residue will only occur when the grayscale difference is large enough, causing the video afterimage problem. In some embodiments, the preset grayscale threshold is greater than or equal to 50% of the grayscale range of the LCD panel. Exemplarily, it can be set to different values such as 50%, 55%, 60%, 65%, 70%, 75%, etc. During implementation, different grayscale thresholds can be set by testing in combination with the specific application scenarios of the product.

[0078] For example, different levels of anti-afterimage modes can also be set. For example, when the requirement for eliminating afterimages is high, the preset grayscale threshold can be set relatively low, such as 50%. If the requirement for eliminating video afterimages is low, the preset grayscale threshold can be set relatively high, such as 80%, so as to meet different usage requirements.

[0079] Step 403: When the input video signal includes the target segment, copy the target frame image of the target segment and insert the copied target image frame into the target segment to obtain the updated video signal, wherein the target image frame is part or all of the image frames in the target segment.

[0080] When it is detected that the input video signal includes a target segment, a target frame image is inserted into the target segment so that the target segment becomes a symmetrical signal, thereby reducing the possibility of video afterimage.

[0081] by Figure 5 The signal shown is a 60FPS signal for exemplary description. During implementation, a target image frame in the signal is selected for copying and inserted into a target segment to obtain an updated image.

[0082] Figure 6 The following figure shows the waveform diagram of the signal obtained after the signal is copied frame. Figure 6 The upper left picture shows its initial asymmetric signal waveform, that is, Figure 5 The signal waveform shown is directly displayed at 60Hz.

[0083] Please continue reading Figure 6 , Figure 6 The upper right figure shows the waveform of the initial signal after the 1+1 copy frame operation, that is, each frame signal undergoes a copy frame operation, and the original one frame signal becomes two frame signals; Figure 6 The lower left figure shows the waveform of the initial signal after the 2+1 copy frame operation, that is, the second frame signal is copied in every two frames of signal, and the original two frames of signal become three frames of signal; Figure 6The lower right figure shows the waveform of the initial signal after the 3+1 copy frame operation, that is, the third frame signal is copied in every three frames of signal in the figure, and the original three-frame signal becomes a four-frame signal.

[0084] As can be seen from the figure, the initial asymmetric signal becomes a symmetrical signal after the three frame copy operations. The frame periods of the converted symmetrical signals are 4, 6, and 8 respectively. To match the signal rate, the signal refresh rate needs to be adjusted while the frame copy operation is being performed.

[0085] In the technical solution of this embodiment, different methods can be set to copy and insert image frames.

[0086] For example, for an asymmetric signal with a signal frame period of T=2n, that is, an asymmetric signal with an even frame period, an a+b frame copying operation can be performed, where a+b is defined as copying the b frame signal based on the a frame signal, that is, converting the a frame initial signal into an a+b frame image signal.

[0087] The corresponding refresh rate adjustment method is called a→c frequency multiplication, where c=a+b. For example, copying one frame from two frames to form three frames is called a 2+1 frame copy operation, and the corresponding refresh rate adjustment method is called 2→3 frequency multiplication. Copying five frames from three frames to form eight frames is called a 3+5 frame copy operation, and the corresponding refresh rate adjustment method is called 3→8 frequency multiplication.

[0088] When b is an odd number, the a→c frequency multiplication corresponding to the a+b copy frame is called odd frequency multiplication; when b is an even number, the a→c frequency multiplication corresponding to the a+b copy frame is called even frequency multiplication.

[0089] In this embodiment, the image frame may be copied and inserted in different ways.

[0090] In some embodiments, step 403 includes:

[0091] Selecting the dth frame image from the a-frame image of the target segment as the target frame image, where a is an even number greater than 2, and d is a positive integer less than or equal to a;

[0092] The target frame image is copied, and the copied image frame is inserted after the original target frame image to obtain the updated video signal including the a+b frame images.

[0093] Select the d-frame signal from the a-frame signal for copying, and copy each frame image once. In this way, after copying the target frame image and inserting the target segment, an a+d-frame image is obtained. At this time, b=d. Compared with the initial a-frame signal, the frame number difference between any two frame signals in the a-frame signal of the initial target segment in the copied image signal is at most one frame. Therefore, this method has a relatively small impact on the display effect.

[0094] In some embodiments, the target frame image is a partial image frame of the target segment; the above step 403 includes: copying the target frame image of the target segment, and inserting N copied image frames after the original image frame to obtain the updated video signal including a+b frame images, where N is an integer greater than or equal to 1.

[0095] The technical solution of this embodiment can be understood as selecting a target frame signal from the a frame signal and copying it multiple times, that is, the copied multiple frame signals are all the same. This method will make a frame signal last longer, but the control method is relatively simple.

[0096] Exemplarily, 2 frames of images are selected as target frame images, that is, d=2, each frame of image is copied twice, then b=2*2=4, and at this time, a+4 frames of image are obtained in total.

[0097] In the technical solution of this embodiment, display data can be updated using a cyclic replication method. Specifically, the method for converting the a-frame signal into the a+b-frame signal is the same for each detected target segment. Specifically, the positions of the replicated frames and the number of replicated frames at each position are the same. Obviously, display data can also be updated using a non-cyclic replication method, that is, the target image frames are replicated and inserted using different methods for each detected target segment.

[0098] Obviously, the above methods may be combined during implementation, and this embodiment does not further limit the method of updating the display data.

[0099] Table 2: Example of T=6 asymmetric signal replication

[0100]

[0101] Table 2 shows examples of different cyclic replication methods for an asymmetric signal with T=6 and a 5+3 frame replication operation. The initial asymmetric signal in Table 2 is a cyclic sequence of +L1, -L2, +L3, -L4, +L5, and -L6. Identical signals within a row represent the replicated frames. For example, in the 5+3 cyclic single-position replication method, the last three consecutive L5 positions in the first row represent the replicated image frames. As can be seen from the figure, after all three cyclic frame replication operations, the initial signal is transformed into a symmetrical signal with T=48.

[0102] In some embodiments, b is an odd number, b is not an odd multiple of T / 2, and b is not an odd multiple of a factor of n, where T is the period of the target segment.

[0103] Table 3: Symmetry of the single-position replicated frame signal for odd-number multiplication cycles

[0104]

[0105] Table 4: Symmetry of the multiplication and cyclic uniform replication frame signal

[0106]

[0107]

[0108] Table 5: Symmetry of the single-position replicated frame signal for even-frequency multiplication and cyclic operation

[0109]

[0110] Table 6: Symmetry of even-frequency multiplication and cyclic replication frame signals

[0111]

[0112]

[0113] Refer to Tables 3 through 6, which show a large number of cyclic frame replication operations performed on asymmetric signals with different signal periods T = 2n, and the resulting signal symmetry results are recorded. Rows in Tables 3 through 6 with a frame replication scheme of 1+0 represent the initial signal, i.e., signals without frame replication. These are asymmetric signals with initial signal periods T of 2 / 4 / 6 / 8 / 10 / 12, respectively. Signal symmetry is marked with an "×."

[0114] The symmetry of the signal generated after the frame is replicated. In the figure, "√" and "×" respectively represent "the positive and negative frames of the signal after the frame is replicated are symmetric" and "the positive and negative frames of the signal after the frame is replicated are asymmetric."

[0115] By analyzing the symmetry results of the signals after copying the frames in Tables 3 to 6 above, it can be seen that, except for some even frequency multiplication cases, the signals obtained by the even frequency multiplication cyclic copying frame operation are still asymmetric signals; and in the case of the odd frequency multiplication cyclic copying frame operation, obtaining a symmetrical signal still needs to meet certain conditions.

[0116] We can further summarize the conditions under which a symmetrical signal can be obtained by cyclically replicating the asymmetrical signal with a signal frame period of T = 2n:

[0117] Assume that the signal frame period of an asymmetric signal is T = 2n (i.e., an even-frame periodic signal), and its half-period is represented by n, where n is a positive integer and the factors of n are n1, n2, ..., nm. A cyclic frame replication operation of the form a + b is performed on the signal. When the frame replication operation satisfies both of the following conditions, the resulting signal is a symmetric signal:

[0118] (1) b is an odd number, that is, the copy frame operation must be an odd-number multiplication cyclic copy frame mode;

[0119] (2) When n>1, a is not an odd multiple of n, and a is not an odd multiple of all factors of n (n1, n2, ...nm).

[0120] In summary, when the above conditions (1) and (2) are met, the signal obtained by performing a cyclic replication frame operation on an asymmetric signal with any signal frame period T = 2n (i.e., an even frame periodic signal) must be a symmetrical signal; and when the above conditions are met, the symmetry of the obtained signal is not affected by the cyclic replication frame mode, that is, the cyclic replication frame mode can be a cyclic single position replication mode, a cyclic uniform replication mode, or other cyclic replication modes, and in any cyclic replication mode, the replication frame position can be placed at any position.

[0121] When the above conditions (1) and (2) are not met, the signal obtained by cyclically replicating the frame is mostly asymmetric. Only in special cases will the signal be symmetrical, for example, when the even frequency multiplication during cyclic uniform replication just meets the even frequency multiplication situation.

[0122] Table 7: Conditions for the signal obtained after copying the frame to be symmetrical

[0123] Signal period T of even-periodic signal The condition that the signal obtained after the a+b type cyclic replication frame is a symmetrical signal T=2, that is, n=1 b=2m+1 T=4, that is, n=2 a≠2(2k+1) and b=2m+1 T=6, that is, n=3 a≠3(2k+1) and b=2m+1 T=8, that is, n=4 a≠4(2k+1) and a≠2(2k+1) and b=2m+1 T=10, that is, n=5 a≠5(2k+1) and b=2m+1 T=12, that is, n=6 a≠2(2k+1) and a≠3(2k+1) and b=2m+1 T=14, that is, n=7 a≠7(2k+1) and b=2m+1 T=16, that is, n=8 a≠8(2k+1) and a≠4(2k+1) and a≠2(2k+1) and b=2m+1

[0124] Figure 7 The specific conditions under which some even-frame periodic asymmetric signals can be converted into symmetric signals after cyclic frame replication operation are shown. In Table 7, k and m are both natural numbers, that is, 2k+1 and 2m+1 are both odd numbers.

[0125] Table 8: Frame symmetry results of even frame periodic signal, asymmetric signal, odd frequency multiplication and cyclic replication

[0126]

[0127]

[0128] Table 8 shows more symmetry results of signals obtained after performing odd-frequency multiplication and cyclic replication frame operations on asymmetric signals with different signal frame periods T=2n (ie, even-frame periodic signals).

[0129] In Table 8, a "√" indicates that the signals obtained under various cyclic replication frame operations are symmetrical. Here, the cyclic replication frame operation can be cyclic single-position replication, cyclic uniform replication, or other cyclic replication methods, and in any cyclic replication method, the replication frame position can be placed at any position. An "×" indicates that the signals obtained under certain cyclic replication frame methods are asymmetrical. Analysis of Table 8 shows that the results all conform to the patterns described in Table 7.

[0130] In some embodiments, after step 403, the method further includes:

[0131] The refresh frequency of the video signal is adjusted according to the number of the copied and inserted target image frames and the number of original image frames of the target segment.

[0132] In this embodiment, since the number of image frames increases, in order to avoid affecting the display effect, the refresh frequency is further adjusted in this embodiment. For example, for the initial 60FPS signal, after the 1+1 copy frame operation, the number of image frames is doubled. Accordingly, its refresh frequency needs to be doubled and adjusted to 120Hz. Similarly, after the 2+1 copy frame operation and the 3+1 copy frame operation, the display refresh rate is adjusted to 90Hz and 80Hz respectively.

[0133] In this embodiment, a frequency adjustment module is further added to adjust the refresh rate, wherein the frequency adjustment module can be set in any of the following positions:

[0134] a logic board Tcon IC integrated into the display device;

[0135] The device integrated into the display device is called a system on chip (SOC);

[0136] It is independently arranged and connected between the logic board Tcon IC and the source driver chip Source IC of the display device.

[0137] like Figure 7 As shown, in the related art, when a display device displays an image, the SOC first obtains the input video signal, sends the input video signal to the logic board TCON IC, and the logic board TCON IC further sends the video signal to the source driver IC. The source driver generates a source signal Sout with positive and negative polarity and sends it to the pixels of the display panel to realize image display. It should be understood that the above process may include multiple signal format conversions. This application does not further describe or limit the specific process of format conversion.

[0138] Please continue reading Figure 8 ,and Figure 7Compared with the related technologies shown, the most important improvement of this embodiment is that a frequency adjustment module is further added. After adjusting the input video signal to a symmetrical signal, its refresh frequency is further adjusted according to the adjustment method of the video signal to match the signal rate.

[0139] For example, Figure 9 As shown, during implementation, a 5+1 loop frame duplication operation can be performed on the video source of the news scrolling strip corresponding to the defective flickering horizontal lines with an initial frame rate of 50 FPS, and it can be displayed at a refresh rate of 60 Hz. After the 5+1 loop frame duplication operation, the video source of the news scrolling strip corresponding to the defective flickering horizontal lines of Changhong is displayed at a refresh rate of 60 Hz.

[0140] Figure 9 The Sout signal of 8 consecutive frames at the scrolling news bar position is partially amplified. Figure 9 It can be seen that among the 6 consecutive frames of Sout signals within the news white bar range, there are 2 consecutive frames of signal data that are consistent but have opposite polarities. For example, the N+1 frame signal (the waveform signal at the bottom of the left figure) in the figure is a copy of the N frame signal (the waveform signal at the top of the left figure), and the N+7 frame signal (the waveform signal at the bottom of the right figure) is a copy of the N+6 frame signal (the waveform signal at the top of the right figure).

[0141] This frame duplication operation is a 5+1 cyclic frame duplication operation, corresponding to a refresh rate multiplication of 5→6, which is an odd-number multiplication. In actual verification, playback of the processed video showed no difference from the original video source, and no flickering horizontal lines were observed for 60 minutes. In other words, the initial periodic asymmetric signal is converted into a periodic symmetrical signal after the 5+1 frame duplication operation.

[0142] Step 404: Display an image according to the updated video signal.

[0143] After processing the video signal, the display device is controlled to display the image according to the updated video signal, thereby effectively reducing video afterimages and improving display effects.

[0144] Please continue to refer to Table 9. Table 9 is for Figure 1 and Figure 2 The statistical analysis results of the video afterimage are obtained after the method of the embodiment of the present application is applied to the solution.

[0145] Table 9: Video afterimage defects

[0146]

[0147]

[0148] As can be seen from Table 9, in this embodiment, Figure 1and Figure 2 In the specific scenario shown, we used a multiplier and cyclically replicated frame processing method. The processed video playback showed no image retention issues, and the actual video effect was identical to the original video source.

[0149] The solution of the present invention can effectively improve various scenarios where video afterimage problems are caused by the input of periodic asymmetric signals, and significantly improve the display effect.

[0150] like Figure 10 As shown, the technical solution of this embodiment can be summarized as follows: when in use, first detecting whether the input signal has an even frame periodicity requires detecting a certain amount of data.

[0151] Before detecting that the signal has an even frame periodicity, the output signal is not adjusted, and the video signal is directly used to control the display device to display the image; after detecting that the input signal has an even frame periodicity, the signal is adjusted and output, and the updated video signal is used to control the display device to display the image, while continuing to detect the frame periodicity of the input signal.

[0152] In order to further optimize the user experience, it is also possible to further optimize for certain scenarios, such as game scenarios. As shown in 11, for example, in the game mode, this embodiment further detects whether the user has a game operation action.

[0153] After detecting the input signal's frame period and until the user initiates the next game operation, the adjusted signal can be directly output. This significantly reduces the amount of data required for analysis and storage, making it more suitable for various gaming and similar scenarios.

[0154] With the development of various high-frame-rate games and the extensive use of various VRR display products, the refresh rate of the display screen will be consistent with the frame rate of the game. At this time, because the content of each frame of the game is different, the content displayed on the display screen is also different each frame, making it difficult to ensure the symmetry of positive and negative frame signals.

[0155] Furthermore, in many gaming scenarios, when the player performs no operations, the display interface will display a periodic dynamic animation effect, meaning that the signal source outputs a periodic signal. In this case, when the user performs no operations, the signals input to the pixels within the surface are mostly periodic, asymmetric signals. If the signal frame period in this scenario is even and the grayscale jump is large, then staying in this game interface for a while and then switching to another screen can easily cause video afterimage problems. The solution described in the present invention is particularly suitable for improving the video afterimage problem that occurs in such scenarios.

[0156] In such scenarios, the refresh rate adjustment module can be further improved by detecting whether the player has any game operations before detecting the signal frame periodicity and performing the cyclic frame copying operation. That is, when it is detected that the player has not performed any mouse, keyboard, handle and other operations for more than a certain period of time, the subsequent signal frame period detection, cyclic frame copying, and refresh rate adjustment operations are performed.

[0157] like Figure 11 As shown, when the user operates normally, the process is the same as Figure 10 The embodiments shown are consistent and will not be further described here. When the refresh rate adjustment module detects no player operation and the input video signal has even frame periodicity, it performs a cyclic frame replication operation and refresh rate adjustment on the signal within a frame period, cyclically replicating the frames to achieve a symmetrical signal, and simultaneously records the adjusted signal within this frame period. The recorded adjusted signal is then continuously output until the player performs a game operation; during this period, there is no need to detect signal periodicity or adjust the refresh rate again.

[0158] An embodiment of the present application provides a display device, including a liquid crystal display panel, including:

[0159] An input module, used for obtaining an input video signal;

[0160] a detection module, configured to detect whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal having a grayscale difference greater than a preset grayscale threshold and an even frame period;

[0161] an image updating module, configured to, when the input video signal includes the target segment, copy a target frame image of the target segment and insert the copied target image frame into the target segment to obtain an updated video signal;

[0162] The display control module is configured to display an image according to the updated video signal.

[0163] In some embodiments, the image update module includes:

[0164] A selection submodule is used to select d frames of images from the a frames of images of the target segment as target frames, where a is an even number greater than 2, and d is a positive integer less than or equal to a;

[0165] The updating submodule is used to copy the target frame image and insert the copied image frame after the original target frame image to obtain the updated video signal including the a+b frame images.

[0166] In some embodiments, b is an odd number, b is not an odd multiple of T / 2, and b is not an odd multiple of a factor of n, where T is the period of the target segment.

[0167] In some embodiments, the target frame image is a partial image frame of the target segment;

[0168] The image update module is specifically used for:

[0169] The target frame image of the target segment is copied, and N copied image frames are inserted after the original image frame to obtain the updated video signal including a+b frame images, where N is an integer greater than or equal to 1.

[0170] In some embodiments, further comprising:

[0171] a frequency adjustment module, configured to adjust the refresh frequency of the video signal according to the number of copied and inserted target image frames and the number of original image frames of the target segment;

[0172] The frequency adjustment module is set at any of the following locations:

[0173] a logic board Tcon IC integrated into the display device;

[0174] The device integrated into the display device is called a system on chip (SOC);

[0175] It is independently arranged and connected between the logic board Tcon IC and the source driver chip Source IC of the display device.

[0176] In some embodiments, the preset grayscale threshold is greater than or equal to 50% of the grayscale range of the liquid crystal display panel. Figure 12 As shown, an embodiment of the present application also provides a display device, including a processor 1201, a memory 1202, and a program 1203 or instruction stored in the memory 1202 and executable on the processor. When the program 1203 or instruction is executed by the processor 1201, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0177] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0178] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0179] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0180] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0181] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A display control method, applied to a display device, wherein the display device includes a liquid crystal display panel, characterized in that: The method comprises: Get the input video signal; detecting whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal with a grayscale difference greater than a preset grayscale threshold and an even frame period; When the input video signal includes the target segment, copying a target frame image of the target segment and inserting the copied target image frame into the target segment to obtain an updated video signal, wherein the target image frame is part or all of the image frames in the target segment; An image is displayed according to the updated video signal.

2. The method according to claim 1, wherein The copying of the target frame image of the target segment and inserting the copied target image frame into the target segment to obtain the updated video signal includes: Selecting the dth frame image from the a-frame image of the target segment as the target frame image, where a is an even number greater than 2, and d is a positive integer less than or equal to a; The target frame image is copied, and the copied image frame is inserted after the original target frame image to obtain the updated video signal including the a+b frame images.

3. The method according to claim 2, wherein b is an odd number, b is not an odd multiple of T / 2, and b is not an odd multiple of a factor of n, where T is the period of the target segment.

4. The method according to claim 1, wherein The target frame image is a partial image frame of the target segment; The copying of the target frame image of the target segment and inserting the copied target image frame into the target segment to obtain the updated video signal includes: The target frame image of the target segment is copied, and N copied image frames are inserted after the original image frame to obtain the updated video signal including a+b frame images, where N is an integer greater than or equal to 1.

5. The method according to any one of claims 1 to 4, characterized in that After obtaining the updated video signal, the method further includes: The refresh frequency of the video signal is adjusted according to the number of the copied and inserted target image frames and the number of original image frames of the target segment.

6. The method according to any one of claims 1 to 4, characterized in that The preset grayscale threshold is greater than or equal to 50% of the grayscale range of the liquid crystal display panel.

7. A display device comprising a liquid crystal display panel, characterized in that: include: An input module, used for obtaining an input video signal; a detection module, configured to detect whether the video signal includes a target segment, wherein the target segment is a periodic asymmetric signal having a grayscale difference greater than a preset grayscale threshold and an even frame period; an image updating module, configured to, when the input video signal includes the target segment, copy a target frame image of the target segment and insert the copied target image frame into the target segment to obtain an updated video signal; The display control module is configured to display an image according to the updated video signal.

8. The display device according to claim 7, wherein: Also includes: a frequency adjustment module, configured to adjust the refresh frequency of the video signal according to the number of copied and inserted target image frames and the number of original image frames of the target segment; The frequency adjustment module is set at any of the following locations: a logic board Tcon IC integrated into the display device; The device integrated into the display device is called a system on chip (SOC); It is independently arranged and connected between the logic board TconIC and the source driver chip Source IC of the display device.

9. A display device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the display control method according to any one of claims 1 to 6.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the display control method according to any one of claims 1 to 6 are implemented.

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