Driving method and driving circuit for liquid crystal display panel, and liquid crystal display

Abstract

The present disclosure relates to a driving method and driving circuit for a liquid crystal display panel, and a liquid crystal display. The driving method comprises: receiving a partition refresh instruction, the partition refresh instruction instructing to refresh a frame at a second frequency in a target area of a liquid crystal display panel, wherein the frame is refreshed at a first frequency in at least part of a display area of the liquid crystal display panel, and the second frequency is lower than the first frequency; on the basis of the first frequency and the second frequency, determining a refresh interval frame count of the target area, the refresh interval frame count representing the number of non-display frames between two adjacent display frames within the target area; and providing a data driving signal to the liquid crystal display panel on the basis of the refresh interval frame count, enabling the polarity distribution of the data driving signal to be reversed in a plurality of display frames within the target area.

Description

Driving method and driving circuit for liquid crystal display panel, and liquid crystal display TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular, to a driving method for a liquid crystal display panel, a driving circuit for a liquid crystal display panel, and a liquid crystal display. BACKGROUND

[0002] With the development of display technology and the increasing demand for display, high refresh rate has gradually become a development trend. However, high refresh rate often leads to higher power consumption, which adversely affects the endurance of the device. Therefore, in the case of high refresh rate, how to reduce power consumption has become a problem of concern in the field of display technology.

[0003] In order to reduce power consumption while achieving high refresh rate to increase the endurance of the device, some OLED (Organic Light-Emitting Diode) display devices are equipped with a partition refresh function. Specifically, different refresh rates can be implemented in different areas by frame dropping to maintain high refresh rate in some areas to meet display requirements, and to perform low refresh rate in some areas to reduce overall power consumption. However, for LCD (Liquid Crystal Display) devices, display is generally performed by applying voltage to make liquid crystal molecules change their arrangement state, thereby deflecting incident light. Due to the presence of liquid crystals, if the refresh rate of some areas is simply reduced by frame dropping, the liquid crystals may be in the same polarity for a long time, gradually losing their optical properties, causing display abnormalities. SUMMARY

[0004] Therefore, the present disclosure provides a driving method for a liquid crystal display panel, a driving circuit for a liquid crystal display panel, and a liquid crystal display, which can alleviate, mitigate or even eliminate the above problems.

[0005] According to an aspect of the present disclosure, a driving method for a liquid crystal display panel is provided, wherein in at least a part of the area of the liquid crystal display panel, frames are refreshed at a first frequency, the method comprising: receiving a partition refresh instruction, the partition refresh instruction indicating that frames are refreshed at a second frequency in a target area of the liquid crystal display panel, the second frequency being lower than the first frequency; determining the number of refresh interval frames of the target area based on the first frequency and the second frequency, the number of refresh interval frames representing the number of non-display frames between two adjacent display frames in the target area; and providing a data driving signal to the liquid crystal display panel according to the number of refresh interval frames, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area.

[0006] In some embodiments, providing the data driving signal to the liquid crystal display panel according to the refresh interval frame number such that the data driving signal has a polarity distribution flip in the multiple display frames of the target region comprises: in response to the refresh interval frame number being even, providing the data driving signal with a same polarity distribution to the target region and the region with the frame refreshed at the first frequency, wherein the polarity distribution of the data driving signal flips once per frame.

[0007] In some embodiments, determining the refresh interval frame number of the target region based on the first frequency and the second frequency comprises: in response to the first frequency being an even multiple of the second frequency, determining two or more refresh interval frame numbers, wherein each of the two or more refresh interval frame numbers is an even number greater than or equal to 0, and the refresh interval frame number between any two adjacent display frames within the target region is one of the two or more refresh interval frame numbers.

[0008] In some embodiments, providing the data driving signal to the liquid crystal display panel according to the refresh interval frame number such that the data driving signal has a polarity distribution flip in the multiple display frames of the target region comprises: in response to the refresh interval frame number being odd, providing the data driving signal to the liquid crystal display panel such that the polarity distribution of the data driving signal remains consistent in consecutive two or more frames at least within the target region.

[0009] In some embodiments, in response to the refresh interval frame number being odd, providing the data driving signal to the liquid crystal display panel such that the polarity distribution of the data driving signal remains consistent in consecutive two or more frames at least within the target region comprises: providing the data driving signal with a same polarity distribution to the target region and the region with the frame refreshed at the first frequency, wherein the polarity distribution of the data driving signal flips once every two or more frames.

[0010] In some embodiments, in response to the refresh interval frame number being 1+4n frames, the polarity distribution of the data driving signal flips once every two frames, where n is an integer greater than or equal to 0.

[0011] In some embodiments, in response to the refresh interval frame number being odd, providing the data driving signal to the liquid crystal display panel such that the polarity distribution of the data driving signal remains consistent in consecutive two or more frames at least within the target region comprises: providing a first data driving signal to the region with the frame refreshed at the first frequency in the liquid crystal display panel, wherein the polarity distribution of the first data driving signal flips once per frame; providing a second data driving signal to the target region, wherein the polarity distribution of the second data driving signal flips once every two or more frames.

[0012] In some embodiments, in response to the refresh interval frame number being 1+4n frames, the polarity distribution of the second data driving signal flips every two frames, or, in response to the refresh interval frame number being 3+8n frames, the polarity distribution of the second data driving signal flips every four frames, where n is an integer greater than or equal to 0.

[0013] In some embodiments, in at least part of the frames corresponding to the display frames of the target region, for each column of frame data, the polarity of the data driving signal within the target region is opposite to the polarity of the data driving signal within the region of which the frames are refreshed at the first frequency.

[0014] In some embodiments, the data driving signal is provided to the liquid crystal display panel according to the refresh interval frame number, such that the data driving signal has a polarity distribution flip in multiple display frames of the target region, including: the data driving signal is provided to the liquid crystal display panel according to the refresh interval frame number, such that the data driving signal has opposite polarity distribution in any two adjacent display frames of the target region.

[0015] In some embodiments, the first frequency is adjustable, and all frames within the region of which the frames are refreshed at the first frequency are display frames.

[0016] In some embodiments, the driving method further includes: for the target region, providing an effective scan driving signal in a display frame and an ineffective scan driving signal in a non-display frame, wherein the effective scan driving signal is used to turn on the corresponding pixel to receive the data driving signal.

[0017] In some embodiments, providing an effective scan driving signal in a display frame and an ineffective scan driving signal in a non-display frame for the target region includes: providing the scan driving signal to the liquid crystal display panel by a scan driving circuit, wherein the scan driving circuit includes a plurality of cascaded sub-driving circuits, each of which is connected to a row of pixels in the liquid crystal display panel and includes an input circuit, a cascade signal circuit and an output circuit, wherein the input circuit is configured to make the pull-up node effective in response to the input signal being effective, the cascade signal circuit is configured to provide an effective input signal to the next level sub-driving circuit in response to the pull-up node being effective and the cascade signal being effective, and the output circuit is configured to provide an effective scan driving signal to the corresponding row of pixels in response to the pull-up node being effective and the clock signal being effective.

[0018] In some embodiments, providing the scan driving signal to the liquid crystal display panel by the scan driving circuit includes: during the period of the display frame of the target region, providing an effective cascade signal and an effective clock signal to the target region and the sub-driving circuit corresponding to the region of which the frames are refreshed at the first frequency in the liquid crystal display panel; during the period of the non-display frame of the target region, providing an ineffective cascade signal to the previous level sub-driving circuit of the sub-driving circuit corresponding to the target region.

[0019] In some embodiments, providing the data driving signal to the liquid crystal display panel according to the frame number of the refresh interval, such that the data driving signal has the polarity distribution flip in the multiple display frames of the target region comprises: receiving a synchronization signal, each synchronization signal corresponding to one frame; in response to receiving one or more synchronization signals, flipping the polarity distribution of the data driving signal, such that the data driving signal has the polarity distribution flip in the multiple display frames of the target region.

[0020] In some embodiments, in response to receiving one or more synchronization signals, flipping the polarity distribution of the data driving signal comprises at least one of: in response to the frame number of the refresh interval being even, flipping the polarity distribution of the data driving signal once for each received synchronization signal; in response to the frame number of the refresh interval being odd, flipping the polarity distribution of the data driving signal once for each received two or more synchronization signals, wherein the number of the two or more synchronization signals is determined according to the frame number of the refresh interval; in response to the frame number of the refresh interval being odd, flipping the polarity distribution of the first data signal provided to the region refreshed at the first frequency once for each received synchronization signal, and flipping the polarity distribution of the second data signal provided to the target region once for each received two or more synchronization signals, wherein the number of the two or more synchronization signals is determined according to the frame number of the refresh interval.

[0021] According to another aspect of the present disclosure, there is provided a driving circuit for a liquid crystal display panel, the driving circuit being configured to perform the driving method described in any of the preceding aspects.

[0022] According to yet another aspect of the present disclosure, there is provided a liquid crystal display comprising a liquid crystal display panel and the driving circuit described in the preceding aspects.

[0023] These and other aspects of the present disclosure will be apparent from and elucidated with reference to the embodiments described hereinafter for example. BRIEF DESCRIPTION OF DRAWINGS

[0024] In the following description of example embodiments, reference is made to the accompanying drawings that form a part hereof, and in which:

[0025] FIG. 1 schematically illustrates a zoned frequency division display according to some embodiments of the present disclosure;

[0026] FIG. 2 schematically illustrates a target region frame-separation display and data driving signal polarity distribution frame-separation flip;

[0027] FIG. 3 schematically illustrates an example flowchart of a driving method for a liquid crystal display panel according to some embodiments of the present disclosure;

[0028] FIG. 4 schematically shows an example structure diagram of a scanning driving circuit according to some embodiments of the present disclosure;

[0029] FIG. 5 schematically shows a schematic diagram of a target area displayed every two frames and a data driving signal polarity distribution flipped every two frames;

[0030] FIG. 6 schematically shows an example timing diagram of a data driving signal polarity distribution flipped once every frame;

[0031] FIG. 7 schematically shows a schematic diagram of a target area displayed every frame and a data driving signal polarity distribution flipped every two frames;

[0032] FIG. 8 schematically shows an example timing diagram of a data driving signal polarity distribution flipped once every two frames;

[0033] FIG. 9 schematically shows a schematic diagram of a target area displayed every three frames and a data driving signal polarity distribution in the target area flipped once every four frames;

[0034] FIG. 10 schematically shows a schematic diagram of a target area displayed every frame and a data driving signal polarity distribution in the target area flipped once every two frames;

[0035] FIG. 11 schematically shows an example driving process for a liquid crystal display panel according to some embodiments of the present disclosure;

[0036] FIG. 12 schematically shows an example block diagram of a driving circuit for a liquid crystal display panel according to some embodiments of the present disclosure;

[0037] FIG. 13 schematically shows an example block diagram of a liquid crystal display according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present disclosure. It should be understood that the described embodiments are only some of the embodiments of the present disclosure, but not all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure. Those of ordinary skill in the art will understand that the described embodiments are intended to explain the present disclosure, and should not be considered as a limitation of the present disclosure. Unless specifically described, the specific techniques or conditions are not explicitly described in the following embodiments, and those of ordinary skill in the art can understand them according to the commonly used techniques or conditions in the art or according to the product instructions.

[0039] In the description of the specification, the description of the terms "one embodiment", "another embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment are included in at least one embodiment of the disclosure. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction. In addition, it should be noted that in the specification, the terms "first", "second" are for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0040] As described previously, in order to reduce overall power consumption while achieving high refresh rate, in a display device such as OLED, different refresh rates can be achieved in different regions by frame dropping. Illustratively, when partitioning display for different application scenarios, different refresh rates can be performed in different regions. For example, when using a note application while watching a video, the video region can be a high-frequency refresh region in order to improve the video display effect, and the note region can be a low-frequency refresh region in order to reduce overall power consumption without affecting the display effect. In addition, the partitioning and frequency dividing operation can also be adaptively applied in other scenarios or performed according to user instructions.

[0041] Illustratively, FIG. 1 shows a schematic diagram of partitioned frequency division display according to some embodiments of the disclosure. Illustratively, FIG. 1 shows a display region 100, which can include, for example, a pixel array composed of a plurality of pixels. As shown, according to display requirements, the display region 100 can be divided into N partitions, N can be an integer greater than or equal to 2. In different partitions, different refresh rates can be performed, that is, frames are refreshed at different frequencies. In other words, in each frame, there can be display regions and non-display regions, which can be implemented, for example, by controlling the scanning driving signal. The specific driving process will be described in detail below and will not be described here. Illustratively, as shown in FIG. 1, the partitions can be divided according to pixel rows, for example, one partition can include one or more pixel rows. Alternatively, according to the hardware configuration of the display device or display requirements, the partitions can also be divided according to pixel columns or in other ways, which are not specifically limited by the disclosure.

[0042] In the related art, for an OLED display device using a self-luminous technology, the current flowing through each LED (Light Emitting Diode) can be adjusted by an algorithm to display different images. When there is a need for zoned frequency division display, low frequency display in a partial region can be realized by an algorithm in a frame dropping manner. Unlike an LCD device, there is no liquid crystal inside an OLED display device, so there is no problem of liquid crystal polarization. However, compared with liquid crystal products, OLED products often have disadvantages in yield, service life, cost and the like, especially for large-size products, OLED products often have problems of low yield, short service life, high cost and the like. However, when zoned frequency division refresh is realized in a liquid crystal display device, due to the presence of liquid crystal, if the operation mode in an OLED product is simply used, the liquid crystal in a low frequency display region is always in the same polarity, which can easily cause the problem of liquid crystal polarization.

[0043] Specifically, as shown in FIG. 2, in a conventional case, the polarity distribution of the data signal provided to the pixel array in the liquid crystal display panel can be flipped once per frame to avoid the liquid crystal being in the same polarity for a long time and affecting the display effect or causing a failure. However, in the case of zoned frequency division refresh, since the data signal in the low frequency region can be refreshed once every one or more frames, under the conventional data signal polarity distribution flipping rule, in the low frequency region, the problem that the data signal polarity distribution remains unchanged at each refresh can occur, that is, in the low frequency region, the problem that the polarity of the data driving signal at each pixel remains unchanged at each refresh can occur. For example, as shown in FIG. 2, taking two-zone frequency division as an example, wherein each small square represents a pixel, "+" in the small square represents that the data signal is positive polarity, "-" represents that the data signal is negative polarity, A zone is a high frequency refresh region, the data signal displayed in this region is refreshed once per frame, and B zone is a low frequency refresh region, the data signal displayed in this region is refreshed once every two frames. In other words, the refresh frequency of B zone is one half of that of A zone. As shown in FIG. 2, at the Nth frame, B zone is a positive frame (taking the first column of data as an example), at the N+1th frame, B zone does not refresh (i.e., does not display the data of the N+1th frame) and maintains the positive polarity of the previous frame, at the N+2th frame, B zone refreshes (i.e., displays the data of the N+2th frame) and the polarity is still positive, and similarly, at the N+3th frame, B zone does not refresh and maintains the positive polarity of the previous frame, and so on. As can be seen, in the state of zoned frequency division display shown in FIG. 2, B zone will always maintain the same polarity distribution, that is, the polarity of the data driving signal at each pixel in B zone will remain unchanged, which can easily cause liquid crystal polarization, thereby affecting the display effect. Similarly, when A zone and B zone are refreshed at other frequencies, the same or similar problems can also occur.

[0044] Therefore, the present disclosure provides a new driving method for a liquid crystal display panel to solve or at least alleviate the above problems so as to facilitate mass production of liquid crystal display products with partitioned frequency display function.

[0045] FIG. 3 schematically shows an exemplary flowchart of a driving method 300 for a liquid crystal display panel according to some embodiments of the present disclosure, wherein in at least a part of the area of the liquid crystal display panel, frames can be refreshed at a first frequency. The first frequency can be understood as the highest refresh frequency being performed in the liquid crystal display panel when the driving method 300 is performed. In other words, in the area of the liquid crystal display panel refreshed at the first frequency, each frame is a display frame, i.e. in the area refreshed at the first frequency, each frame is refreshed once and there is no non-display frame. Exemplarily, the first frequency can be adjustable. The present disclosure does not limit the specific value of the first frequency, and optionally, the first frequency can be adjusted to 60Hz, 120Hz, 240Hz, etc. various frequency values according to specific display requirements. Exemplarily, the driving method 300 can be implemented by a driving circuit for driving the liquid crystal display panel, which may, for example, include a pixel array composed of a plurality of pixels, which can be displayed under the driving of the driving circuit and refresh frame data at a specified frequency. As shown in FIG. 3, the driving method 300 can include steps 310 to 330.

[0046] At step 310, a partition refresh instruction can be received, which can instruct to refresh frames in a target region of the liquid crystal display panel at a second frequency, which is lower than the first frequency. Illustratively, the partition refresh instruction can be received from an upper application program, which can specify the target region and the second frequency. In embodiments of the present disclosure, the partition refresh instruction can indicate to refresh frames in the target region of the liquid crystal display panel at the second frequency in any possible way. For example, the partition refresh instruction can specify the target region by specifying a pixel range covered by the target region, or can specify the target region by specifying a size ratio and relative position relationship of the target region to the total display region or a non-target region, etc. In addition, the target region can also be specified in other ways. For example, the partition refresh instruction can directly specify a specific value of the second frequency, or specify a ratio of the second frequency to the first frequency, or can specify a selected frequency from several pre-set selectable frequencies as the second frequency, or the partition refresh instruction can only indicate to perform a lower refresh frequency in the target region or indicate a frequency range, while a suitable second frequency is adaptively determined by the driving circuit. In addition, the second frequency can also be specified or determined in other ways. In addition, optionally, in addition to the first frequency and the second frequency, there can also be regions in the liquid crystal display panel that are refreshed at other frequencies. Optionally, the target region can be a sub-region of at least a part of the region that refreshes frames at the first frequency, or can also be a region that partially overlaps or does not overlap at all with at least a part of the region that refreshes frames at the first frequency. For example, before receiving the aforementioned partition refresh instruction, if there are other regions in the liquid crystal display panel that refresh frames at other frequencies (which are lower than the first frequency) in addition to the region that refreshes frames at the first frequency, the target region to which the aforementioned partition refresh instruction is directed can only include a sub-region of the region that refreshes frames at the first frequency, or can alternatively or additionally include the other region or a sub-region thereof.

[0047] At step 320, a refresh interval frame number of the target region can be determined based on the first frequency and the second frequency. The refresh interval frame number can represent a frame number of non-display frames spaced between two adjacent display frames in the target region. In embodiments of the present disclosure, a display frame can be understood as a frame data normally refreshed and displayed, and a non-display frame can be understood as a frame data not displayed due to non-refresh. Taking FIG. 2 as an example, the B region can be regarded as the target region, wherein the Nth frame and the N+2th frame can be regarded as display frames, and the N+1th frame and the N+3th frame can be regarded as non-display frames. In the example shown in FIG. 2, the Nth frame and the N+2th frame can be regarded as two adjacent display frames, and the refresh interval frame number is 1. Illustratively, the refresh interval frame number can be determined according to a ratio of the first frequency and the second frequency. For example, when the first frequency is twice the second frequency, the refresh interval frame number can be 1 frame; when the first frequency is three times the second frequency, the refresh interval frame number can be 2 frames; when the first frequency is four times the second frequency, the refresh interval frame number can be 3 frames; and so on, when the first frequency is m times the second frequency, the refresh interval frame number can be m-1 frames, where m is an integer greater than or equal to 2. Alternatively, the refresh interval frame number can also be determined based on the first frequency and the second frequency through methods such as look-up table or others.

[0048] At step 330, the data driving signal can be provided to the liquid crystal display panel according to the refresh interval frame number, so that the data driving signal has a polarity distribution flip in the multiple display frames of the target area. The data driving signal having a polarity distribution flip in the multiple display frames of the target area should be understood as, at each pixel within the target area, the polarity of the data driving signal received at the pixel in at least one of the multiple display frames in succession is different from the polarity of the data driving signal received at the pixel in other display frames. Exemplarily, the polarity distribution of the data driving signal can be controlled by a data driving circuit, where the data driving circuit can include, for example, an OP (Operational Amplifier) circuit that can be switched between positive polarity and negative polarity. Further exemplarily, the OP circuit can be switched between different polarities by a corresponding switching circuit, and such switching can be based on, for example, a synchronization signal such as a VSYNC (Vertical Synchronization) signal, etc., which can be regarded as a signal switching from a previous frame to a next frame. Conventionally, the data driving circuit can flip the polarity distribution of the data driving signal once, i.e., switch the polarity of the above-mentioned OP circuit once, each time such a synchronization signal is received, as shown in FIG. 2. However, in various embodiments of the present disclosure, in order to avoid the data driving signal maintaining the same polarity distribution in the multiple display frames of the target area, the polarity distribution flip rule of the data driving signal can be adjusted so that the polarity distribution flip occurs in multiple consecutive display frames of the target area, such as once per display frame, or once every other, two or more display frames. Exemplarily, the synchronization signal can be counted by means of a register or other means, so that the data driving signal performs a polarity distribution flip once upon receiving two or more synchronization signals. In addition, the polarity distribution flip rule of the data driving signal can also be adjusted by other means, as long as it can be achieved that the polarity distribution of the data driving signal has a flip in the multiple display frames that occur in succession in the target area. Here, the multiple display frames can refer to two, three, four, five or more display frames.

[0049] In the present disclosure, the polarity distribution flip of the data driving signal should be understood as, at each pixel within the corresponding area, the polarity of the data driving signal is flipped, from positive polarity to negative polarity, or from negative polarity to positive polarity. Further, in the present disclosure, the polarity distribution of the data driving signal flips once every m frames (m is an integer greater than or equal to 1) should be understood as, at each pixel within the corresponding area, the polarity of the data driving signal flips once every m frames.

[0050] It should be understood that the driving scheme provided by the present disclosure can be applied to any polarity distribution flipping manner, for example, frame-by-frame flipping, column-by-column flipping, row-by-row flipping, point-by-point flipping, etc. In the case of frame-by-frame flipping, the polarities of the data driving signals of all pixels remain the same; in the case of column-by-column flipping, the polarities of the data driving signals of pixels in each column are the same, and the polarities of the data driving signals of pixels in adjacent two columns are different; in the case of row-by-row flipping, the polarities of the data driving signals of pixels in each row are the same, and the polarities of the data driving signals of pixels in adjacent two rows are different; in the case of point-by-point flipping, the polarities of the data driving signals of each pixel and the pixels above, below, left and right thereof are all different. Alternatively, there can be other polarity distribution flipping manners. Such polarity distribution flipping manner can be determined by the hardware configuration of the display panel or display device, and the present disclosure is not specifically limited in this respect.

[0051] By the above driving method 300, local low-frequency refreshing can be performed in the target area according to the partition refreshing instruction from the upper-layer application program, etc., wherein the long-term same polarity of liquid crystal in the target area can be avoided by adjusting the flipping rule of the polarity distribution of the data driving signal, thereby avoiding the display abnormality caused by liquid crystal polarization.

[0052] In some embodiments, in order to achieve better display effect, at step 330, the data driving signal can be provided to the liquid crystal display panel according to the refreshing interval frame number, so that the data driving signal has opposite polarity distribution in any two adjacent display frames of the target area. In the present disclosure, the data driving signal having opposite polarity distribution in any two adjacent display frames (or two adjacent frames) of the target area should be understood as that, at each pixel in the target area, the polarity of the data driving signal is opposite in any two adjacent display frames (or two adjacent frames). On the one hand, this helps to minimize the time for which the liquid crystal remains in the same polarity, thereby minimizing the risk of liquid crystal polarization, and on the other hand, this also helps to avoid the brightness unevenness problem caused by the polarity of the data driving signal at each pixel remaining unchanged in two or more consecutive display frames, for example, when the polarity of a certain pixel is the same in two consecutive display frames, the brightness of the latter display frame can be slightly higher than that of the former display frame.

[0053] In some embodiments, the method 300 further comprises: for the target area, providing an effective scan driving signal in a display frame and an ineffective scan driving signal in a non-display frame, wherein the effective scan driving signal is used to turn on the corresponding pixel to receive the data driving signal. As mentioned above, the liquid crystal display panel can comprise an array of pixels for a display frame, wherein each pixel can correspond to a pixel switch, such as a TFT (Thin Film Transistor) switch or the like. The conduction of the pixel switch can correspond to the pixel being turned on, at which time the pixel can receive a new data driving signal, i.e. perform refresh of the frame data; the disconnection of the pixel switch can correspond to the pixel being turned off, at which time the pixel will not receive a new data driving signal, i.e. will not perform refresh of the frame data, but will maintain the previous data. Illustratively, the conduction and disconnection of each pixel switch can be controlled by the scan driving signal to achieve different refresh frequencies in different areas. For example, in an area where the frame is refreshed at a first frequency, an effective scan driving signal can be provided to all pixels in the area in each frame to receive a new data driving signal and perform refresh of the frame data, while in the target area where the frame is refreshed at a second frequency, an effective scan driving signal can be provided to all pixels in the target area in the determined display frame to receive a new data signal and perform refresh of the frame data, and an ineffective scan driving signal can be provided in the non-display frame so that no data refresh is performed in the non-display frame and each pixel maintains the previous data. Thus, the partitioned frequency display in the display area of the liquid crystal display panel can be achieved.

[0054] In some embodiments, a scan driving signal can be provided to the liquid crystal display panel by a scan driving circuit, so as to provide an effective scan driving signal in a display frame in a target area and an ineffective scan driving signal in a non-display frame. The scan driving circuit can include a plurality of cascaded sub-driving circuits, and the output end of each sub-driving circuit can be connected to a row of pixels in the liquid crystal display panel, where a row can refer to a horizontal row or a vertical row. FIG. 4 schematically shows a structural block diagram of a sub-driving circuit 400 in a scan driving circuit according to some embodiments of the present disclosure. As shown in the figure, each sub-driving circuit 400 can include an input (Input) circuit 401, a cascaded signal circuit 402 and an output (Gout) circuit 403. The input circuit 401 can be configured to receive an input signal, and to make a pull-up (PU) node 404 effective in response to the input signal being effective; the cascaded signal circuit 402 can be configured to receive a cascaded signal S01, and to output an effective S03 in response to the pull-up node 404 being effective and the cascaded signal S01 being effective, which can serve as an input signal of a next-stage sub-driving circuit; and the output circuit 403 can be configured to receive a clock signal S02, and to provide an effective output signal S04 in response to the pull-up node 404 being effective and the clock signal S02 being effective, which can be transmitted to a corresponding row of pixels as a scan driving signal thereof. In the present disclosure, the scan driving circuit can also be referred to as a gate driven on array (GOA), and the output of each stage of GOA circuit can be connected to a corresponding pixel switch and serve as a driving signal of a switch element therein, such as a gate driving signal of a transistor. Optionally, one or more of the input circuit 401, the cascaded signal circuit 402 and the output circuit 403 can be implemented by means of one or more transistors, and according to the type of the transistor, the effective input signal, the effective pull-up node, etc. can refer to a high level or a low level, which can be selected according to the specific circuit structure, and the present disclosure does not make specific limitations in this regard.

[0055] Exemplarily, the display conditions of the pixels controlled by the circuit 400 can be as shown in the following table, where 1 represents effective and 0 represents ineffective:

[0056] As shown in the table, when the input signal is invalid, i.e. the cascade signal S01 of the upper circuit is invalid resulting in the output S03 being invalid, the PU cannot be set to be valid, and no matter how S01, S02 is valued, S03, S04 cannot be outputted valid. When the input signal is valid, the PU can be set to be valid, the cascade signal circuit 402 and the output circuit 403 can be opened, at this time, when the cascade signal S01 is valid, the S03 outputted by the cascade signal circuit 402 is valid, then the input signal provided to the lower circuit is valid, whether the next row of pixels is displayed depends on whether the clock signal of the lower circuit is valid; when the cascade signal S01 is invalid, the S03 outputted by the cascade signal circuit 402 is invalid, then the input signal provided to the lower circuit is invalid, the next row of pixels is not displayed; when the clock signal S02 is valid, the outputted scan driving signal S04 is valid, then the current row of pixels can be displayed; when the clock signal S02 is invalid, the outputted scan driving signal S04 is invalid, then the current row of pixels is not displayed. More specifically, when S01, S02 are both invalid, S03, S04 are both invalid, at this time, the current row and the next row are both not displayed; when S01 is invalid and S02 is valid, S03 is invalid and S04 is valid, at this time, the current row is displayed and the next row is not displayed; when S01 is valid and S02 is invalid, S03 is valid and S04 is invalid, at this time, the current row is not displayed and whether the next row is displayed depends on whether the clock signal of the next stage circuit is valid; when S01, S02 are both valid, S03, S04 are both valid, at this time, the current row is displayed and whether the next row is displayed depends on whether the clock signal of the next stage circuit is valid. Here, display should be understood as refreshing and displaying new frame data, corresponding to pixel opening, and no display should be understood as not refreshing and keeping the previous frame data, corresponding to pixel closing. It can be seen that through the plurality of cascaded sub-driving circuits 400, based on the logic shown in the above table, by adjusting the cascade signal S01 and / or the clock signal S02 provided to each stage of the sub-driving circuit, the opening or closing of the pixels of any row can be realized, thereby conveniently realizing different refresh frequencies of any partition. Taking the display area shown in FIG. 1 as an example, in a certain frame, if 1200-1399 rows of pixels are to be displayed as the display area, i.e. 1200-1399 rows of pixels are displayed, then only the cascade signal S01 of the sub-driving circuit corresponding to 1199-1398 rows of pixels is valid, and the clock signal S02 of the sub-driving circuit corresponding to 1200-1399 rows of pixels is valid; if 1400 rows and subsequent rows are to be non-display area, i.e. 1400 rows and subsequent rows of pixels are not displayed, then only the cascade signal S01 of the sub-driving circuit corresponding to 1399 rows of pixels is invalid, or the clock signal S02 of the sub-driving circuit corresponding to 1400 rows and subsequent rows of pixels is invalid.

[0057] Exemplarily, the scan driving circuit can provide the scan driving signal to the liquid crystal display panel in the following manner: during the display frame period of the target region, the effective cascade signal and the effective clock signal are provided to the sub driving circuit corresponding to the target region and the region in the liquid crystal display panel which is refreshed at the first frequency; during the non-display frame period of the target region, the invalid cascade signal is provided to the upper level sub driving circuit of the sub driving circuit corresponding to the target region. Taking FIG. 2 as an example, in the Nth frame and the N+2th frame, the effective cascade signal and the effective clock signal can be provided to the sub driving circuit corresponding to all the pixel rows in the A region and the B region, so that all the pixel rows are turned on and the frame data is refreshed; in the N+1th frame and the N+3th frame, the effective cascade signal and the effective clock signal can be provided to the sub driving circuit corresponding to the first two pixel rows in the A region, and the effective clock signal and the invalid cascade signal can be provided to the sub driving circuit corresponding to the last pixel row in the A region, so that the pixel rows in the A region are normally turned on and the frame data is refreshed, and the pixel rows in the B region are turned off, and the frame data of the previous frame is not refreshed and kept. In the above manner, the arbitrary partition frequency division refresh can be conveniently realized.

[0058] In some embodiments, step 330 can include, in response to the refresh interval frame number being even, providing the target area and the area with the first refresh frequency of frames with data driving signals of the same polarity distribution, wherein the polarity distribution of the data driving signals flips once per frame. In other words, when the refresh interval frame number is even, the aforementioned conventional polarity flipping rule of the data driving signals can be adopted, for example, the data driving circuit can perform polarity switching once per time of receiving the synchronization signal, so as to realize flipping of the polarity distribution of the data driving signals once per frame. In the case of the polarity distribution of the data driving signals flipping once per frame, when the refresh interval frame number is even, in the target area, the polarity distribution of the data driving signals in any two adjacent display frames can be opposite. Taking the case of the refresh interval frame number being equal to 2 as an example, assuming that the Nth frame is a positive frame (taking the polarity of part of the pixels as a representative, such as taking the polarity of a certain column of pixels as a representative), in the target area, the N+1th frame and the N+2th frame are not refreshed, according to the polarity distribution of the data driving signals flipping once per frame, the N+3th frame will be a negative frame, i.e., opposite to the polarity distribution of the data driving signals of the Nth frame, i.e., the polarity distribution of the data driving signals of two adjacent display frames is opposite. Optionally, the refresh interval frame number can be 2, 4, 6, 8 or other even values, so as to realize different refresh frequencies. Optionally, in this embodiment, the refresh interval frame number can be any even value 2n, wherein n is an integer greater than or equal to 1. Different refresh interval frame numbers can be realized by the control scheme of the scan driving signal described in the foregoing circuit structure shown in FIG. 4, in a display frame, the target area can be provided with an effective scan driving signal, and in a non-display frame, the target area can be provided with an ineffective scan driving signal. Similarly, the polarity distribution of the data driving signals flipping once per frame can be adopted, in combination with appropriate scan driving signals, to realize refresh interval frame numbers of 4, 6, 8 and other even values. Thus, partitioned frequency refresh can be realized with relatively simple logic, while avoiding the liquid crystal in the low-frequency area being in the same polarity for a long time, and avoiding liquid crystal polarization to affect the display effect.

[0059] In the present disclosure, providing the two areas with data driving signals of the same polarity distribution can be understood as that the polarity distribution rules of the data driving signals in the two areas are the same. Exemplarily, in the case of adopting the flip mode of flip per column, when the two areas are provided with data driving signals of the same polarity distribution, for each column of pixels, if the column of pixels includes two pixel portions respectively located in the two areas, the polarities of the data driving signals at the two pixel portions will always remain the same. For other flip modes, similar understanding can be adopted.

[0060] As shown in FIG. 5, taking a two-zone frequency division as an example, the A zone is refreshed at a first frequency (for example, 120 Hz), the B zone is refreshed at a second frequency (for example, 40 Hz), the first frequency is 3 times the second frequency, and the refresh interval is 2 frames. In this example, the polarity distribution of the data driving signal is flipped every frame. As shown in the figure, within the B zone, the polarity distribution of the driving data signal of any two adjacent display frames can be opposite. For example, when receiving a zone refresh instruction, at the Nth frame, the circuit structure shown in FIG. 4 can be used to make the cascade signals S01 and the clock signals S02 of the sub-driving circuits corresponding to all pixel rows in the A zone and the B zone all effective, that is, all pixels are turned on, and the frame data in the A zone and the B zone are normally refreshed. At the N+2th and N+3th frames, the clock signals of the sub-driving circuits of all pixels in the A zone can be made effective, the cascade signals S01 of the sub-driving circuits corresponding to the first two rows of pixels can be made ineffective, and the cascade signals S01 of the sub-driving circuits corresponding to the last row of pixels can be made ineffective, to achieve normal refreshing of the A zone and non-refreshing of the B zone. At the N+3th frame, all pixels can be controlled to be turned on as in the Nth frame, and the frame data in the A zone and the B zone are normally refreshed. In this way, high-frequency display of the A zone and low-frequency display of the B zone (refreshing once every two frames) can be achieved, and the polarity of the data driving signal of the B zone display frame always changes, and there is no problem of liquid crystal polarization.

[0061] In some embodiments, the hardware configuration of the circuit for driving the liquid crystal display panel can only support data driving signals with polarity distribution flipping once per frame. In such embodiments, only even number of refresh interval frames can be allowed. When the specified first frequency is an even multiple of the second frequency, normally, the refresh interval frame number should be odd. However, alternatively, in some embodiments of the present disclosure, in response to the first frequency being an even multiple of the second frequency, two or more refresh interval frame numbers can be determined, wherein each of the two or more refresh interval frame numbers is an even number greater than or equal to 0, and the refresh interval frame number between any two adjacent display frames within the target region is one of the two or more refresh interval frame numbers. In other words, in such embodiments, the refresh interval frame number between different adjacent display frames within the target region can be different, but all are even numbers greater than or equal to 0. In this way, while achieving the even ratio of the first frequency to the second frequency, the liquid crystal polarization problem can be avoided by determining the refresh interval frame number to be even. Exemplarily, in response to the first frequency being an even multiple of the second frequency, and the hardware configuration only supporting data driving signals with polarity distribution flipping once per frame, two or more refresh interval frame numbers can be determined, each of which can be 2n (n is an integer greater than or equal to 0). Exemplarily, the refresh interval frame number between some adjacent display frames can be 0, and the refresh interval frame number between other adjacent display frames can be an even number greater than or equal to 2. For example, when the first frequency is 2 times of the second frequency, normally, the refresh interval frame number should be 1, such as the case shown in FIG. 2. At this time, according to some embodiments of the present disclosure, the refresh interval frame number between some adjacent display frames can be determined as 0, and the refresh interval frame number between some adjacent display frames can be determined as 2, such as following the rule of “display frame, display frame, non-display frame, non-display frame” in a cycle. Alternatively, the refresh interval frame number between different adjacent display frames can be determined as different even numbers. For example, when the first frequency is 4 times of the second frequency, normally, the refresh interval frame number should be 3. At this time, according to some embodiments of the present disclosure, the refresh interval frame number between some adjacent display frames can be determined as 2, and the refresh interval frame number between some adjacent display frames can be determined as 4, such as following the rule of “display frame, non-display frame, non-display frame, display frame, non-display frame, non-display frame, non-display frame, non-display frame” in a cycle. It should be understood that the above specific examples are merely exemplary, and for different frequency ratios, different refresh interval frame numbers can be designed according to needs.

[0062] Exemplarily, FIG. 6 schematically shows a timing diagram 600 of data driving signal polarity distribution flipping once per frame. As shown, the polarity signal Source of the data driving signal can flip once per frame in response to receiving one VSYNC signal, so that the polarity distribution of the data driving signal can flip once per frame.

[0063] As analyzed above, when the polarity distribution of the data driving signal flips once per frame, and the refresh interval is 1 frame, the polarity distribution of the data driving signal will remain unchanged in the display frames within the target area, thus causing liquid crystal polarization. Similarly, the same liquid crystal polarization problem will exist when the refresh interval is any other odd number of frames. Assume that within the target area, the first frame is a positive frame (represented by the polarity of some pixels, such as a column of pixels). Since the refresh interval is odd, frames 2, 4, ..., 2n will not be refreshed, but will only be refreshed in one or more frames from the 3rd, 5th, 7th, ..., 2n+1th frames, where n is an integer greater than or equal to 1. However, according to the rule that the polarity distribution of the data driving signal flips once per frame, frames 3, 5th, 7th, ..., 2n+1 are all positive frames. Therefore, for this target area, the polarity distribution of the data driving signal will remain unchanged in each display frame, easily causing liquid crystal polarization.

[0064] In some embodiments, step 330 may include: providing a data driving signal to the liquid crystal display panel in response to an odd number of refresh interval frames, such that the polarity distribution of the data driving signal remains consistent across two or more consecutive frames, at least within a target area. By ensuring that the polarity distribution of the data driving signal within the target area remains consistent across two or more consecutive frames, or in other words, by flipping the polarity distribution of the data driving signal every two or more frames, it is possible to achieve the reversal of the polarity distribution of the data driving signal in multiple consecutive display frames within the target area when the refresh interval frame number is odd. For example, this can achieve opposite polarity distributions of the data driving signals in any two adjacent display frames. For example, when the refresh interval is 1 frame, if the polarity distribution of the data driving signal flips every 2 frames, the polarity distribution of the data driving signal in adjacent display frames within the target area can be reversed; when the refresh interval is 3 frames, if the polarity distribution of the data driving signal flips every 4 frames, the polarity distribution of the data driving signal in adjacent display frames within the target area can be reversed; when the refresh interval is 5 frames, if the polarity distribution of the data driving signal flips every 6 frames, the polarity distribution of the data driving signal in adjacent display frames within the target area can be reversed; and so on. Alternatively, for example, when the refresh interval is 3 frames, the polarity distribution of the data driving signal can also flip every 3 frames or according to other rules. In this case, although it is not possible to achieve reverse polarity distributions in any two display frames, it is still possible to achieve that the polarity distribution of the data driving signal flips in multiple display frames, that is, it will not always remain consistent. Similar polarity distribution flipping rules for the data driving signal can be designed for other refresh intervals. It should be understood that the above examples are only for ease of understanding and are not restrictive. For cases where the refresh interval frame number is odd, different polarity distribution reversal rules for the data driving signal can be adopted according to the specific value of the refresh interval frame number, as long as the requirement that the polarity distribution of the data driving signal is reversed in multiple display frames in the target area can be met. Preferably, the data driving signal can be satisfied to have opposite polarity distributions in any two adjacent display frames in the target area.

[0065] In some embodiments, the polarity distribution of the data driving signal can be kept consistent across two or more consecutive frames within the target area by providing data driving signals with the same polarity distribution to both the target area and the area refreshed at a first frequency, wherein the polarity distribution of the data driving signal flips once every two or more frames. For example, when a partition refresh instruction is received and the refresh interval is odd, the polarity of the data driving signal can be changed from flipping once per frame to flipping once every two or more frames. For instance, the polarity signal source in the data driving circuit, such as the aforementioned OP circuit capable of switching between positive and negative polarity, can be changed from switching polarity once for each received synchronization signal (e.g., a VSYNC signal) to switching polarity only once for every two or more received synchronization signals. For example, the number of received synchronization signals can be recorded using a register or other circuit structure. When the recorded number reaches a specified threshold (i.e., the number of frames corresponding to one polarity flip of the data driving signal), a signal can be generated to control the switching state of the switching circuit in the OP circuit, thereby achieving the polarity flip.

[0066] For example, in response to a refresh interval of 1 + 4n frames, where n is an integer greater than or equal to 0, data drive signals with the same polarity distribution can be provided to the target area and the area refreshed at a first frequency, wherein the polarity distribution of the data drive signals can be flipped every two frames. When n = 0, the refresh interval is 1 frame, and the second frequency can be half of the first frequency, for example, the first frequency can be 120Hz and the second frequency can be 60Hz; when n = 1, the refresh interval is 5 frames, and the second frequency can be 1 / 6 of the first frequency, for example, the first frequency can be 120Hz and the second frequency can be 20Hz; and so on, various combinations of the first and second frequencies can be implemented. Different refresh intervals can be implemented through the control scheme of the scan drive signal described above with reference to the circuit structure shown in Figure 4. Within a display frame, an effective scan drive signal can be provided to the target area, and within a non-display frame, an invalid scan drive signal can be provided to the target area.

[0067] As shown in Figure 7, taking a two-zone refresh rate as an example, zone A refreshes at a first frequency (e.g., 120Hz), and zone B refreshes at a second frequency (e.g., 60Hz). The first frequency is twice the second frequency, and the refresh interval is one frame. In this example, the polarity distribution of the data driving signal flips every two frames. As shown, within zone B, the polarity distribution of the driving data signal for any two adjacent display frames can be opposite. For example, when a zone refresh command is received, if the current frame (frame N) is a positive frame (taking the first column of data as an example), then in frame N+1, the polarity distribution of the data driving signal will remain unchanged, i.e., the same as in frame N. In frame N+2, the polarity distribution flips. In frame N+3, the polarity distribution remains the same as in frame N+2, and so on. As shown in the figure, by flipping the polarity distribution of the data drive signal every two frames, the liquid crystal in the B area of ​​the low-frequency refresh can be prevented from being in the same polarity for a long time, thereby effectively avoiding the irreversible impact of liquid crystal polarization on the optical properties of the liquid crystal and avoiding display abnormalities and malfunctions.

[0068] For example, Figure 8 schematically illustrates a timing diagram 800 in which the polarity distribution of the data drive signal flips once every two frames. As shown, the polarity signal Source of the data drive signal can flip once for every two VSYNC signals received, so that the polarity distribution of the data drive signal can flip once every two frames.

[0069] In embodiments where data driving signals of the same polarity distribution are provided to both the target region and the region refreshed at the first frequency, the polarity distribution of the data driving signals in the target region and the region refreshed at the first frequency will always remain consistent. Unlike these embodiments, in some embodiments, the polarity distribution of the data driving signals in the target region and the region refreshed at the first frequency may be different, or at least different in some frames. For example, in at least a portion of the frames corresponding to the display frame of the target region, for each column of frame data, the polarity of the data driving signal in the target region may be opposite to the polarity of the data driving signal in the region refreshed at the first frequency. Here, each column of frame data can be understood as corresponding to the data driving signal provided to each column of sub-pixels. In the above embodiments, for each column of frame data, the polarity of the data driving signal in the target area is opposite to the polarity of the data driving signal in the area where the frame is refreshed at the first frequency. This can be understood as follows: for each column of sub-pixels, if the portion of the sub-pixel in the column that falls into the area where the frame is refreshed at the first frequency is regarded as the first pixel portion, and the portion of the sub-pixel in the column that falls into the target area is regarded as the second pixel portion, then the polarity of the data driving signal in the first pixel portion is opposite to the polarity of the data driving signal in the second pixel portion. For example, the former is positive and the latter is negative, or the former is negative and the latter is positive.

[0070] In some embodiments, the polarity distribution of the data driving signal within the target area can be kept consistent across two or more consecutive frames by providing data driving signals with different polarity distribution flipping rules to the target area and other areas respectively. Specifically, a first data driving signal can be provided to an area of ​​the liquid crystal display panel that refreshes frames at a first frequency, wherein the polarity distribution of the first data driving signal flips once per frame; a second data driving signal can be provided to the target area, wherein the polarity distribution of the second data driving signal flips once every two or more frames. Exemplarily, the first data driving signal and the second data driving signal can be generated by two polarity signal sources in the data driving circuit respectively. For example, there can be two aforementioned OP circuits that can switch between positive and negative polarities, one OP circuit switching polarity once for each synchronization signal received, and the other OP circuit switching polarity once for each two or more synchronization signals received. Alternatively, there can be two switching circuits for switching the signal polarity of the OP circuits, one switching circuit switching its switching state once for each synchronization signal received, and the other switching circuit switching its switching state once for each two or more synchronization signals received, thereby achieving data driving signals with different polarity distributions. Alternatively, the first data driving signal and the second data driving signal can be generated in other ways. Further exemplarily, as described above, multiple cascaded sub-driving circuits can be used to provide scan driving signals to each row of pixels. These scan driving signals can be provided row-by-row, allowing the pixel array to receive the data driving signals row by row. Thus, in each frame, when scanning a region refreshed at the first frequency, a data driving signal can be provided based on a polarity signal source that flips its polarity once per frame. When scanning the target region, the method can be switched to providing a data driving signal based on a polarity signal source that flips its polarity once every two or more frames. Alternatively, data driving signals with different polarity flipping rules can be provided in different regions in other ways. Furthermore, optionally, when regions refreshed at frequencies other than the first and second frequencies exist, data driving signals with different polarity distribution flipping rules can be similarly provided for regions with other refresh frequencies.

[0071] Compared to providing data drive signals with the same polarity distribution (where the polarity distribution flips every two or more frames) to the target area and the area refreshed at the first frequency, providing data drive signals with different polarity distribution flipping rules to different areas helps avoid affecting the display effect of the high-frequency refresh area. For example, when providing data drive signals with the same polarity distribution to the target area and the area refreshed at the first frequency, where the polarity distribution flips every two or more frames, the polarity distribution of the data drive signal in the area refreshed at the first frequency may only flip once every two or more frames. This could lead to brightness differences between different frames, or increase the risk of polarization due to the liquid crystal being in the same polarity in multiple consecutive frames. Therefore, by providing data drive signals with different polarity distribution flipping rules to different areas, the display effect can be further optimized, and the risk of liquid crystal polarization can be minimized. However, compared to providing data drive signals with different polarity distribution flipping rules to different regions, providing data drive signals with the same polarity distribution to the target region and the region refreshed at the first frequency is logically simpler and requires less circuit hardware configuration. Therefore, it helps to reduce the risk of liquid crystal polarization at a lower cost and more reliably. Optionally, when both of the above schemes are applicable, one of the two schemes can be selected based on one or more of the following: hardware configuration (e.g., whether it supports providing data drive signals with different polarity distribution flipping rules to different regions), the specific value of the refresh interval frame number, and other display requirements.

[0072] For example, in response to a refresh interval of 1 + 4n frames, the polarity distribution of the second data driving signal can be flipped every two frames, where n is an integer greater than or equal to 0. When n = 0, the refresh interval is 1 frame, and the second frequency can be half the first frequency, for example, the first frequency can be 120Hz and the second frequency can be 60Hz; when n = 1, the refresh interval is 5 frames, and the second frequency can be 1 / 6 of the first frequency, for example, the first frequency can be 120Hz and the second frequency can be 20Hz; and so on, various combinations of the first and second frequencies can be implemented. Alternatively, in response to a refresh interval of 3 + 8n frames, the polarity distribution of the second data driving signal can be flipped every four frames, where n is an integer greater than or equal to 0. When n = 0, the refresh interval is 3 frames, and the second frequency can be 1 / 4 of the first frequency. For example, the first frequency can be 120Hz and the second frequency can be 30Hz. When n = 1, the refresh interval is 11 frames, and the second frequency can be 1 / 12 of the first frequency. For example, the first frequency can be 120Hz and the second frequency can be 10Hz. And so on, various combinations of the first and second frequencies can be achieved. Different refresh intervals can be implemented using the control scheme for the scan drive signal described above with reference to the circuit structure shown in Figure 4. Within a display frame, an effective scan drive signal can be provided to the target area; outside of a display frame, an invalid scan drive signal can be provided to the target area.

[0073] As shown in Figure 9, taking a two-zone refresh rate as an example, zone A refreshes at a first frequency (e.g., 120Hz), and zone B refreshes at a second frequency (e.g., 30Hz). The first frequency is four times the second frequency, and the refresh interval is three frames. In this example, the polarity distribution of the data driving signal in zone A flips once per frame, while the polarity distribution of the data driving signal in zone B flips once every four frames. As shown in Figure 9, within zone B, the polarity distribution of the driving data signal can change across multiple consecutive display frames. For example, when a partition refresh command is received, if the current frame (the Nth frame) is a positive frame (taking the first column of data as an example), then in the N+1th, N+2nd, and N+3rd frames, the polarity distribution of the data driving signal in area A flips normally, that is, it flips once per frame. The polarity distribution of the data driving signal in area B remains consistent with that in the Nth frame. In the N+4th, N+5th, N+6th, and N+7th frames, the polarity distribution of the data driving signal in area A continues to flip normally. The polarity distribution of the data driving signal in area B flips in the N+4th frame, becoming a negative frame (taking the first column of data as an example). In the N+5th, N+6th, and N+7th frames, it remains consistent with the polarity distribution of the N+4th frame, and so on. Further exemplified, taking the first column of data as an example, in frame N+1, the polarity distribution of the data driving signal in area A flips normally, becoming negative polarity, and can maintain positive polarity when scanning to area B; in frame N+2, area A flips to positive polarity, and area B maintains positive polarity; in frame N+3, area A flips to negative polarity, and can maintain positive polarity when scanning to area B; in frame N+4, area A flips to positive polarity, and when scanning to area B, the polarity signal source can be switched, for example, by switching the OP circuit to make the data driving signal negative polarity; in frame N+5, area A flips to negative polarity, and area B maintains negative polarity; in frame N+6, area A flips to positive polarity, and area B maintains negative polarity; in frame N+7, area A flips to negative polarity, and area B maintains negative polarity; and so on.

[0074] As shown in Figure 10, taking a two-zone refresh rate as an example, zone A refreshes at a first frequency (e.g., 120Hz), and zone B refreshes at a second frequency (e.g., 60Hz). The first frequency is twice the second frequency, and the refresh interval is one frame. In this example, the polarity distribution of the data driving signal in zone A flips once per frame, while the polarity distribution of the data driving signal in zone B flips once every two frames. As shown, within zone B, the polarity distribution of the driving data signal can change across multiple consecutive display frames. For example, when a partition refresh command is received, if the current frame (the Nth frame) is a positive frame (taking the first column of data as an example), then in the N+1th frame, the polarity distribution of the data driving signal in area A is flipped normally, and the polarity distribution of the data driving signal in area B remains consistent with the Nth frame. In the N+2th frame, the polarity distribution of the data driving signal in both areas A and B is flipped. In the N+3rd frame, the polarity distribution of the data driving signal in area A is flipped normally, and the polarity distribution of the data driving signal in area B remains consistent with the N+2th frame, and so on. To further illustrate, taking the first column of data as an example, in frame N+1, the polarity of the data driving signal in area A flips normally, becoming negative. When scanning to area B, the data driving signal remains positive. In frame N+2, area A flips to positive polarity. When scanning to area B, the polarity signal source can be switched, for example, by switching the OP circuit, to change the data driving signal to negative polarity. In frame N+3, the data driving signals in areas A and B are both negative, and so on.

[0075] Although the above description uses refresh intervals of 1+4n frames and 3+8n frames as examples to illustrate a scheme for providing data drive signals with different polarity distribution reversal rules to different regions, this is merely exemplary and not restrictive. In reality, by selecting an appropriate polarity distribution reversal rule for the target region, it is possible to achieve polarity distribution reversal of the data drive signal in multiple display frames of the target region under any refresh interval, or to achieve polarity distribution reversal of the data drive signal in any two adjacent display frames of the target region. Therefore, based on the above idea of ​​providing data drive signals with different polarity distribution reversal rules to different regions, liquid crystal polarization problems can be avoided under various refresh intervals (i.e., under different proportions of the first frequency and the second frequency) without affecting the display effect of high-frequency display areas (e.g., areas refreshed at the first frequency). It is evident that this type of embodiment has high flexibility and a very wide applicable frequency range.

[0076] Optionally, the various data driving signal polarity distribution reversal schemes described above can be implemented individually, or two or more can be implemented in combination. Furthermore, as mentioned in the various embodiments above, the polarity distribution reversal of the data driving signals can be controlled based on synchronization signals, where each synchronization signal can correspond to one frame. To implement the various data driving signal polarity distribution reversal schemes mentioned in the embodiments above, the following steps can be performed: in response to receiving one or more synchronization signals, the polarity distribution of the data driving signals is reversed, such that the polarity distribution of the data driving signals is reversed in multiple display frames of the target area, wherein, exemplarily, the number of one or more synchronization signals can be determined based on the determined refresh interval frame number and the reversal scheme adopted.

[0077] For example, the step of reversing the polarity distribution of the data drive signal in response to receiving one or more synchronization signals may include at least one of the following: reversing the polarity distribution of the data drive signal once for each synchronization signal received in response to an even refresh interval frame number; reversing the polarity distribution of the data drive signal once for each two or more synchronization signals received in response to an odd refresh interval frame number, wherein the number of two or more synchronization signals is determined according to the refresh interval frame number; reversing the polarity distribution of a first data signal provided to a region refreshed at a first frequency frame once for each synchronization signal received in response to an odd refresh interval frame number; and reversing the polarity distribution of a second data signal provided to a target region once for each two or more synchronization signals received, wherein the number of two or more synchronization signals is determined according to the refresh interval frame number. Further exemplarily, when the refresh interval frame number is determined to be even, such as when the ratio of the first frequency to the second frequency is odd, or when the ratio of the first frequency to the second frequency is even but two or more refresh interval frame numbers are determined (where each refresh interval frame number is even), the polarity distribution of the data drive signal can be flipped once upon receiving a synchronization signal (e.g., as shown in Figure 6), and data drive signals with the same polarity distribution can be simultaneously provided to the target area and the area refreshed at the first frequency; when the refresh interval frame number is determined to be odd, and a scheme is adopted to provide data drive signals with the same polarity distribution to the target area and the area refreshed at the first frequency, the polarity distribution of the data drive signal can be flipped once upon receiving two or more synchronization signals (e.g., as shown in Figure 8), where two or more The number of synchronization signals is determined based on the refresh interval frame number, such as in the embodiments described above for refresh interval frame numbers of 1+4n. When the refresh interval frame number is determined to be odd, and a scheme is adopted to provide data drive signals with different polarity distribution flipping rules to the target area and the area refreshed at the first frequency, the polarity distribution of the first data signal provided to the area refreshed at the first frequency frame number can be flipped once when a synchronization signal is received (for example, as shown in Figure 6), and the polarity distribution of the second data signal provided to the target area can be flipped once when two or more synchronization signals are received (for example, as shown in Figure 8). The number of two or more synchronization signals is determined based on the refresh interval frame number, such as in the embodiments described above for refresh interval frame numbers of 1+4n, 3+8n, etc.

[0078] For further clarification, Figure 11 schematically illustrates an example driving flow 1100 for a liquid crystal display panel according to some embodiments of the present disclosure. As shown in Figure 11, in step 1101, the application program (AP) can issue a partition refresh command. As previously described, the partition refresh command can instruct frames to be refreshed at a second frequency in a target area, i.e., instructing frames to be refreshed at different frequencies in different areas. In step 1102, the integrated circuit (IC) for driving the liquid crystal display panel can receive the partition refresh command from the AP and determine the refresh interval frame number for the target area (i.e., the low-frequency area) based on the received command. In step 1103, it can be determined whether the refresh interval frame number satisfies 1 + 4n frames, where n is an integer greater than or equal to 0. If yes, step 1104 can be executed; otherwise, step 1105 is executed. In step 1104, the polarity distribution of the data driving signal (DATA signal shown in the figure) provided to the liquid crystal display panel (including the high-frequency region and the low-frequency region) can be flipped every two frames. Alternatively, data driving signals with different polarity distribution flipping rules can be provided to the high-frequency region and the low-frequency region respectively. In the high-frequency region, the polarity distribution of the data driving signal flips once per frame, and in the low-frequency region, the polarity distribution of the data driving signal flips once every two frames. For example, one of the two schemes can be selected based on hardware configuration support and design requirements. For instance, in an IC that does not support providing data driving signals with different polarity distribution flipping rules in different zones, only the former scheme can be selected; in an IC that supports providing data driving signals with different polarity distribution flipping rules in different zones, the latter scheme can be selected to achieve better display effects and minimize liquid crystal polarization, or the former scheme can be selected for simpler control logic; and so on. In step 1105, it can be determined whether the refresh interval frame number is even. If so, step 1106 is executed; otherwise, step 1107 is executed. In step 1106, the polarity distribution of the data drive signal provided to the liquid crystal display panel can be flipped normally, i.e., flipped once per frame. In step 1107, data drive signals with different polarity distribution flipping rules can be provided to the high-frequency and low-frequency regions respectively. In the high-frequency region, the polarity distribution of the data drive signal flips once per frame, while the polarity distribution flipping rule of the data drive signal in the low-frequency region can depend on the specific refresh interval frame number. In step 1108, image data can be loaded for display.

[0079] The process 1100 shown in Figure 11 allows for the combination of the aforementioned different polarity distribution flipping schemes, thereby covering various refresh interval frame numbers and enabling combinations of different refresh frequencies. It should be understood that the steps shown in Figure 11 do not necessarily have to be executed in the order shown or described. For example, the judgments performed at steps 1103 and 1105 can be performed in reverse order; that is, the judgment on whether the interval is even-numbered frames can be performed first, followed by the judgment on whether the interval is 1+4n frames.

[0080] For example, if the IC does not support data drive signals with different polarity distribution flip rules for partitions, process 1100 will not include step 1107, and step 1104 will only allow selection of a scheme where the DATA polarity flips once every two frames. In this case, the IC can execute an even number or 1+4n refresh interval frame number according to the various embodiments described above. In this case, if the ratio of the first frequency to the second frequency is odd, the refresh interval can be even, and step 1106 can be executed; if the ratio of the first frequency to the second frequency is 2+4n, the refresh interval can be 1+4n, and step 1104 can be executed. Furthermore, for the ratio of the first frequency to the second frequency other than 2+4n, as described in the previous embodiment, two or more refresh interval frame numbers can be determined, where each refresh interval frame number is an even number, to satisfy the even ratio of the first frequency to the second frequency, and step 1106 can be executed. Alternatively, the refresh interval frame number can be normally determined to be an odd number other than 1+4n, and the polarity of DATA can be flipped every three or more frames to achieve the effect of the low-frequency liquid crystal polarity flipping in continuous display frames without affecting the display effect of the high-frequency area as much as possible, so as to reduce the risk of liquid crystal polarization.

[0081] Similarly, exemplarily, if the IC does not support flipping the polarity distribution of the data drive signal every two or more frames, i.e., only supporting flipping the polarity distribution once per frame, process 1100 may only include the branch of step 1106. In this case, for the case where the ratio of the first frequency to the second frequency is odd, the refresh interval can be even, and step 1106 can be executed. Furthermore, for the case where the ratio of the first frequency to the second frequency is even, as described in the previous embodiments, two or more refresh interval frame numbers can be determined, where each refresh interval frame number is even, so as to satisfy the even ratio of the first frequency to the second frequency while avoiding the case where the refresh interval frame number is odd, and step 1106 is executed.

[0082] Furthermore, for the sake of simplicity, Figure 11 does not show the steps for implementing different refresh frequencies for different regions using scan drive signals. It should be understood that the corresponding steps can be performed by referring to the various embodiments described in Figure 4.

[0083] This disclosure also provides a driving circuit for a liquid crystal display panel, which can be configured to perform the driving methods described in the foregoing embodiments.

[0084] Generally, a liquid crystal display panel can include a display area, which may include a pixel array consisting of multiple pixels. Each pixel may correspond to a pixel switch, such as a TFT (Thin Film Transistor) or other type of switching circuit. Each row of pixels can be connected to a scan drive signal line, and each column of pixels can be connected to a data drive signal line. The scan drive signal can be provided by various sub-circuits in the scan drive circuit. The scan drive signal provided by each sub-circuit can correspond to a pixel row, and each pixel row can be turned on row by row under the control of the scan drive signal, thereby refreshing row by row to receive the data drive signal provided to the pixel array. The data drive signal can be provided by a data drive circuit, which may include a polarity signal source that can switch between positive and negative polarities, which can adjust the polarity of the data drive signal provided to the pixel array. The magnitude of the data drive signal may depend on the frame data received from the outside (such as an upper-layer application).

[0085] For example, FIG12 schematically illustrates a block diagram of a driving circuit for a liquid crystal display panel according to some embodiments of the present disclosure. As shown in FIG12, the driving circuit 1210 may include a driving control circuit 1211, which may be configured to perform the driving methods described in the foregoing various embodiments. Furthermore, the driving circuit 1210 may also include a data driving circuit 1212, which may be configured, under the control of the driving control circuit 1211, to generate data driving signals with different polarity distribution flipping rules, and the generated data driving signals may be provided to pixels in the display area 1221 of the liquid crystal display panel 1220. Additionally, the driving circuit 1210 may also include a scan driving circuit 1213, which may be configured, under the control of the driving control circuit 1211, to generate scan driving signals, and the generated scan driving signals may be provided to pixels in the display area 1221. For example, the scan driving circuit 1213 may include a plurality of sub-driving circuits 400 as shown in FIG4, and the drive control circuit 1211 may provide cascaded signals and clock signals to the scan driving circuit 1213 according to various embodiments described with reference to FIG4, so as to control the display status of different areas in the display area 1221.

[0086] It should be understood that the driving circuit for the liquid crystal display panel described above may have the same or similar embodiments and advantages as the aforementioned driving method, and for the sake of brevity, it will not be elaborated here.

[0087] This disclosure also provides a liquid crystal display, which may include a liquid crystal display panel and the aforementioned driving circuit for driving the liquid crystal display panel.

[0088] For example, FIG13 schematically illustrates a block diagram of a liquid crystal display 1300 according to some embodiments of the present disclosure. As shown, the liquid crystal display 1300 includes a driving circuit 1310 and a liquid crystal display panel 1320, wherein the driving circuit 1310 may adopt the structure of the driving circuit 1210 shown in FIG12, and may be configured to perform the driving methods described in the foregoing various embodiments to achieve arbitrary segmentation frequency refresh in the liquid crystal display panel. It should be understood that the liquid crystal display may have the same or similar embodiments and advantages as the foregoing driving methods, which will not be elaborated here for the sake of brevity.

[0089] By studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed subject matter. In the claims, the word "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not imply that a combination of these measures cannot be used for profit.

Claims

1. A driving method for a liquid crystal display panel, wherein, In at least a part of the liquid crystal display panel, frames are refreshed at a first frequency, and the method comprises: receiving a subfield refresh instruction, the subfield refresh instruction indicating that frames are refreshed at a second frequency in a target area of the liquid crystal display panel, the second frequency being lower than the first frequency; determining a refresh interval frame number of the target area based on the first frequency and the second frequency, the refresh interval frame number representing a frame number of non-display frames spaced between two adjacent display frames in the target area; providing a data driving signal to the liquid crystal display panel according to the refresh interval frame number, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area.

2. The method of claim 1, wherein, The providing of the data driving signal to the liquid crystal display panel according to the refresh interval frame number, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area comprises: in response to the refresh interval frame number being even, providing the target area and an area refreshed at the first frequency with data driving signals of the same polarity distribution, wherein the polarity distribution of the data driving signal flips every frame.

3. The method of claim 2, wherein, The determining of the refresh interval frame number of the target area based on the first frequency and the second frequency comprises: in response to the first frequency being an even multiple of the second frequency, determining two or more refresh interval frame numbers, wherein each of the two or more refresh interval frame numbers is an even number greater than or equal to 0, and the refresh interval frame number between any two adjacent display frames in the target area is one of the two or more refresh interval frame numbers.

4. The method of claim 1, wherein, The providing of the data driving signal to the liquid crystal display panel according to the refresh interval frame number, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area comprises: in response to the refresh interval frame number being odd, providing the data driving signal to the liquid crystal display panel so that the polarity distribution of the data driving signal remains consistent in two or more consecutive frames at least in the target area.

5. The method of claim 4, wherein, The providing of the data driving signal to the liquid crystal display panel in response to the refresh interval frame number being odd, so that the polarity distribution of the data driving signal remains consistent in two or more consecutive frames at least in the target area comprises: providing the target area and an area refreshed at the first frequency with data driving signals of the same polarity distribution, wherein the polarity distribution of the data driving signal flips every two frames or more.

6. The method of claim 5, wherein, in response to the refresh interval frame number being 1+4n frames, the polarity distribution of the data driving signal flips every two frames, where n is an integer greater than or equal to 0.

7. The method of claim 4, wherein, The providing of the data driving signal to the liquid crystal display panel in response to the refresh interval frame number being odd, so that the polarity distribution of the data driving signal remains consistent in two or more consecutive frames at least in the target area comprises: providing a first data driving signal to a region of the liquid crystal display panel that refreshes frames at the first frequency, wherein a polarity distribution of the first data driving signal flips every frame; providing a second data driving signal to the target region, wherein a polarity distribution of the second data driving signal flips every two or more frames.

8. The method of claim 7, wherein, in response to the refresh interval being 1+4n frames, the polarity distribution of the second data driving signal flips every two frames, or, in response to the refresh interval being 3+8n frames, the polarity distribution of the second data driving signal flips every four frames, where n is an integer greater than or equal to 0.

9. The method of claim 4, wherein, in at least some of the frames corresponding to the display frames of the target region, for each column of frame data, a polarity of a data driving signal in the target region is opposite to a polarity of a data driving signal in the region that refreshes frames at the first frequency.

10. The method of claim 1, wherein, the providing of the data driving signal to the liquid crystal display panel according to the refresh interval such that there is a polarity distribution flip of the data driving signal in a plurality of display frames of the target region includes: the providing of the data driving signal to the liquid crystal display panel according to the refresh interval such that there is a polarity distribution flip of the data driving signal in a plurality of display frames of the target region includes:

11. The method of claim 1, wherein, the first frequency is adjustable, and, in the region that refreshes frames at the first frequency, all frames are display frames.

12. The method of any of claims 1-11, further comprising: providing, for the target region, an active scan driving signal in the display frames and an inactive scan driving signal in the non-display frames, wherein the active scan driving signal is used to turn on a corresponding pixel to receive the data driving signal.

13. The method of claim 12, wherein, the providing, for the target region, an active scan driving signal in the display frames and an inactive scan driving signal in the non-display frames includes: providing, by a scan driving circuit, a scan driving signal to the liquid crystal display panel, wherein the scan driving circuit includes a plurality of cascaded sub-driving circuits, each sub-driving circuit is connected to a row of pixels in the liquid crystal display panel and includes an input circuit, a cascade signal circuit, and an output circuit, wherein the input circuit is configured to make a pull-up node active in response to an input signal being active, the cascade signal circuit is configured to provide an active input signal to a next sub-driving circuit in response to the pull-up node being active and a cascade signal being active, and the output circuit is configured to provide an active scan driving signal to a corresponding row of pixels in response to the pull-up node being active and a clock signal being active.

14. The method of claim 13, wherein, the providing, by a scan driving circuit, a scan driving signal to the liquid crystal display panel includes: providing, during a time period of a display frame of the target region, an active cascade signal and an active clock signal to the target region and to a sub-driving circuit corresponding to the region of the liquid crystal display panel that refreshes frames at the first frequency; providing, during a time period of a non-display frame of the target region, an inactive cascade signal to a previous sub-driving circuit of the sub-driving circuit corresponding to the target region.

15. The method of any one of claims 1-11, wherein, The providing the data driving signal to the liquid crystal display panel according to the refresh interval frame number, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area includes: receiving synchronization signals, each synchronization signal corresponding to a frame; in response to receiving one or more synchronization signals, flipping the polarity distribution of the data driving signal, so that the data driving signal has a polarity distribution flip in a plurality of display frames of the target area.

16. The method of claim 15, wherein, The response to receiving one or more synchronization signals, flipping the polarity distribution of the data driving signal includes at least one of: in response to the refresh interval frame number being even, flipping the polarity distribution of the data driving signal once for each received synchronization signal; in response to the refresh interval frame number being odd, flipping the polarity distribution of the data driving signal once for every two or more synchronization signals, wherein the number of the two or more synchronization signals is determined according to the refresh interval frame number; in response to the refresh interval frame number being odd, flipping the polarity distribution of the first data signal provided to the area refreshed at the first frequency once for each received synchronization signal, and flipping the polarity distribution of the second data signal provided to the target area once for every two or more synchronization signals, wherein the number of the two or more synchronization signals is determined according to the refresh interval frame number.

17. A driving circuit for a liquid crystal display panel, the driving circuit being configured to perform the driving method of any one of claims 1-16.

18. A liquid crystal display comprising a liquid crystal display panel and the driving circuit of claim 17.

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