Frame rate control method of liquid crystal display screen and corresponding device

Abstract

The invention discloses a frame rate control method of a liquid crystal display screen and a corresponding device. The method comprises the following steps: extracting gray scale data of a plurality of initial areas from gray scale data of a current frame, and determining a plurality of groups of compensation patterns according to low-order data of the gray scale data of the plurality of initial areas; respectively selecting a plurality of initial compensation patterns from the plurality of groups of compensation patterns, wherein the plurality of initial compensation patterns respectively correspond to the plurality of initial areas; the method comprises the following steps: respectively determining new compensation patterns in a group of compensation patterns to which a plurality of initial compensation patterns belong in a manner of gradually increasing or gradually decreasing a step length according to a serial number from the plurality of initial compensation patterns, and simultaneously, respectively gradually increasing or gradually decreasing corresponding areas in a row direction and a column direction of a liquid crystal display screen from the plurality of initial areas to position new areas, enabling the new compensation pattern to correspond to a new area of the liquid crystal display screen until the display screen is covered; and adding a compensation value to the gray scale data of the corresponding region of the current frame according to each compensation pattern. The method solves the display problem caused by the obvious periodicity of the compensation pattern.

Description

Technical Field

[0001] This application belongs to the technical field of displays, and particularly relates to a frame rate control method and corresponding device for a liquid crystal display screen. Background Art

[0002] Frame rate control (FRC) is a technology widely used in liquid crystal display devices. By using less data to represent the same gray level, the cost of the display device can be reduced.

[0003] Figure 1 Examples of spatially simulating gray levels using frame rate control technology are given. In Figure 1 (a), the compensation pattern corresponding to the pixel matrix composed of pixels D1 to D4 can be expressed as , according to this compensation pattern, only pixel D1 is adjusted from gray level 0 to gray level 1, and the viewer will recognize a display effect of a quarter gray level. In Figure 1 (b), the compensation pattern corresponding to the pixel matrix composed of pixels D1 to D4 can be expressed as , according to this compensation pattern, only pixels D2 and D3 are adjusted from gray level 0 to gray level 1, and the viewer will recognize a display effect of two quarters gray level. In Figure 1 (c), the compensation pattern corresponding to the pixel matrix composed of pixels D1 to D4 can be expressed as , according to this compensation pattern, only pixels D2 to D4 are adjusted from gray level 0 to gray level 1, and the viewer will recognize a display effect of three quarters gray level. Through this principle, the frame rate control technology can assign different compensation values to different pixels of the current frame without increasing the hardware resolution, simulate more abundant gray levels, and thus improve the fineness of the display effect.

[0004] Figure 2 Examples of temporally simulating gray levels using frame rate control (FRC) technology are given. In Figure 2 (a), a compensation pattern for four frames is , according to this compensation pattern, the gray level of the 4th frame is 1, and the gray levels of the other three frames are 0. This combination simulates a display effect of a quarter gray level (25%). In Figure 2 (b), a compensation pattern for four frames is , according to this compensation pattern, among the four frames, the gray levels of the third and fourth frames are 1, and the gray levels of the other two frames are 0. This combination simulates a display effect of a half gray level (50%). In Figure 2 (c), a compensation pattern for four frames is , the gray levels of the second to fourth frames are 1, and the gray level of the first frame is 0. This combination simulates three - quarter gray level (75%).

[0005] However, if there is an obvious periodicity in the operation of simulating gray levels over time (for example, cycling through the same set of compensation patterns between frames), it will cause visual artifacts such as vertical lines, horizontal lines, and diagonals. If there is an obvious periodicity in the operation of simulating gray levels in space (for example, cycling through the same set of compensation patterns between regions of the same frame), it will cause flickering or dynamic artifact phenomena. These problems, either alone or in combination, will lead to a decline in the display effect. Summary of the Invention

[0006] To avoid obvious periodicity in time or space in the operation of simulating gray levels over time or in space, the present invention proposes a frame rate control method and a corresponding device for a liquid crystal display screen, which alleviates this problem to a certain extent.

[0007] In a first aspect, an embodiment of the present disclosure provides a frame rate control method for a liquid crystal display screen, including:

[0008] Extract the gray - scale data of multiple initial regions of the liquid crystal display screen from the gray - scale data of the current frame, and determine multiple sets of compensation patterns according to the low - order data of the gray - scale data of the multiple initial regions. Each compensation pattern in each set of compensation patterns is sorted by serial number;

[0009] Select multiple initial compensation patterns from the corresponding multiple sets of compensation patterns respectively. The multiple initial compensation patterns respectively correspond to the multiple initial regions;

[0010] Starting from each initial compensation pattern, in a set of compensation patterns to which it belongs, determine new compensation patterns by setting a step size in an increasing or decreasing order of the serial number. At the same time, starting from each initial region, increment the corresponding number of regions in the row direction and column direction of the liquid crystal display screen to locate new regions. The new compensation patterns correspond to the new regions until the liquid crystal display screen is covered;

[0011] Add compensation values to the gray - scale data of the corresponding regions of the current frame according to the compensation patterns of the corresponding regions, and apply data voltages to the liquid crystal display screen according to the gray - scale data after adding the compensation values.

[0012] In some embodiments, the number of the multiple initial regions and the multiple initial compensation patterns is 4. Each initial region increments two regions each time to locate the new regions, and the new compensation patterns are determined in an increasing or decreasing order of 2 by serial number.

[0013] In some embodiments, the manner of setting the step size in increasing or decreasing order of the serial number includes: the serial number increases in both the row direction and the column direction, the serial number increases in the row direction and decreases in the column direction, the row direction decreases and the column direction increases, and the row direction decreases and the column direction decreases.

[0014] In some embodiments, it further includes: the current frames are successively the 1st frame to the Nth frame sequentially obtained from the frame sequence, and the frame rate control method further includes: changing the initial region and / or the initial compensation pattern in the 1st frame to the Nth frame.

[0015] In some embodiments, the serial number of the initial compensation pattern of the initial region in the 1st frame to the Nth frame in the group of compensation patterns to which it belongs increases or decreases according to s, and s is taken from P prime numbers less than N.

[0016] In some embodiments, if the new serial number obtained by setting the step size in increasing and / or decreasing order of the serial number is greater than the maximum serial number in the group of compensation patterns to which it belongs or is a negative number, then the remainder of the new serial number divided by the number of compensation patterns in the group of compensation patterns to which it belongs is taken to obtain a valid serial number, and if the result is negative, then the absolute value is taken again.

[0017] In some embodiments, changing at least one of the multiple initial regions in the 1st frame to the Nth frame includes: moving the initial region in the 1st frame to the Nth frame to the next region according to a set step size.

[0018] In some embodiments, the number of groups of the multiple groups of compensation patterns and the number of compensation patterns in each group are determined according to the resolution of the liquid crystal display screen and the grayscale data of the current frame.

[0019] In a second aspect, an embodiment of the present disclosure provides a frame rate control method for a liquid crystal display screen, and the frame rate control method cyclically executes the following selection operation of the initial compensation pattern:

[0020] Successively obtain the 1st frame to the Nth frame from the frame sequence;

[0021] Determine multiple groups of compensation patterns according to the low-order data of the grayscale data of multiple initial regions in the 1st frame to the Nth frame, and each compensation pattern in each group of compensation patterns is arranged in order;

[0022] Respectively select multiple initial compensation patterns from each group of compensation patterns of each frame, and the multiple initial compensation patterns respectively correspond to the multiple initial regions;

[0023] Among them, the serial number of the compensation pattern of the initial region at the same position in the 1st frame to the Nth frame in the compensation pattern group to which it belongs increases or decreases according to s, and s is taken from the set of prime numbers less than N.

[0024] In a third aspect, an embodiment of the present disclosure provides a frame rate control device in a liquid crystal display device, comprising:

[0025] A data analysis module is used to analyze the grayscale data of the current frame and divide it into low-bit data and high-bit data;

[0026] a pixel counter for generating column position information;

[0027] A row counter, used to generate row position information;

[0028] A pattern generator, for determining a group of compensation patterns from a plurality of buffered compensation patterns according to low-bit data of each initial area of ​​the current frame, and then selecting a corresponding initial compensation pattern from the group of compensation patterns; and starting from each initial compensation pattern, determining a new compensation pattern in the group of compensation patterns to which it belongs by increasing or decreasing the set step length according to the sequence number, and simultaneously starting from each initial area, locating the new area by increasing the corresponding number of areas in the row direction and the column direction of the liquid crystal display screen respectively based on the row position information and the column position information, the new compensation pattern corresponding to the new area until the liquid crystal display screen is covered;

[0029] The adder is used to determine whether to add a compensation value to each pixel of the high-bit data according to the compensation pattern corresponding to each area, and process accordingly.

[0030] In some embodiments, it also includes: a frame counter for obtaining a frame count, and the current frame is the 1st frame to the Nth frame obtained in sequence from the frame sequence, then the pattern generator also includes: changing the initial area and / or the initial compensation pattern in the 1st frame to the Nth frame according to the frame count.

[0031] In some embodiments, the serial numbers of the initial compensation patterns of the initial areas in the 1st frame to the Nth frame in the compensation pattern group to which they belong are increased or decreased according to s, and s is taken from P prime numbers less than N.

[0032] In some embodiments, the pattern generator determines four initial areas and four initial compensation patterns, and the pattern generator obtains the new compensation pattern for the four initial compensation patterns in a manner in which the serial numbers increase in both row and column directions, the serial numbers increase in the row direction and decrease in the column direction, the serial numbers decrease in the row direction and increase in the column direction, and the serial numbers decrease in the row direction and decrease in the column direction.

[0033] In a fourth aspect, an embodiment of the present disclosure provides a liquid crystal display device, comprising the frame rate control device described above.

[0034] The frame rate control method and corresponding device for a liquid crystal display screen provided by the embodiments of the present disclosure propose a spatial arrangement mode of compensation patterns to effectively prevent line artifact phenomena caused by obvious periodicity of using compensation patterns in space. At the same time, a temporal arrangement mode of compensation patterns is also proposed to effectively prevent polarity voltage coupling and periodic dynamic artifact and flicker phenomena caused by repeated use of preset compensation patterns.

[0035] It should be noted that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Through the description of the embodiments of the present application with reference to the following drawings, the above and other objects, features, and advantages of the present application will become clearer. In the drawings: Figure 1 An example of simulating gray levels spatially using frame rate control technology is given; Figure 2 An example of simulating gray levels temporally using frame rate control (FRC) technology is given; Figure 3 The identification method of the compensation patterns in the embodiments of the present disclosure is given; Figure 4 The flowchart of the frame rate control method in the embodiments of the present disclosure is given; Figure 5 is for explaining Figure 4 the example shown in Figure 6 The flowchart of the frame rate control method in the embodiments of the present disclosure is given; Figure 7 is for explaining Figure 6 the example shown in Figure 8 is the structural schematic diagram of the frame rate control device in the embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The present application will be described in more detail below with reference to the drawings. In each drawing, the same elements are denoted by similar reference numerals. For clarity, the parts in the drawings are not drawn to scale. In addition, some well-known parts may not be shown.

[0038] The embodiments of the present disclosure first define a set of compensation patterns and adopt Representation. Among them, t represents the serial number of the current compensation pattern in this group of compensation patterns, and x represents the size of the grayscale data to which the compensation value needs to be added (usually the numerical size of the low-order data of the grayscale data). Here, the high-order and low-order data of the grayscale data refer to: for example, for a 2*2 pixel area, that is, 4-bit grayscale data, if the low 2 bits are called low-order data and the remaining high-order bits are called high-order data, at this time, there are three binary forms of the low-order data: 01, 10, 11. Then, when the low-order data of the received grayscale data is 01, a pattern is selected from the corresponding group of compensation patterns, and the compensation value is added to the high-order data on the corresponding pixel according to the pattern. = , , , That is, when the low-order data of the received grayscale data is 01, a pattern is selected from the corresponding group of compensation patterns, and the compensation value is added to the high-order data on the corresponding pixel according to the pattern.

[0039] Reference Figure 3 As shown, k represents the number of pixels occupied by a row of the compensation pattern (i.e., the width), g represents the number of pixels occupied by a column of the compensation pattern (i.e., the length), Fc represents the number of frames, indicating that when performing the gray-level simulation operation in time, Fc frames are taken as a group. Hi represents the serial number of the compensation pattern in the horizontal direction of the liquid crystal display screen, Vj represents the serial number of the compensation pattern in the vertical direction of the liquid crystal display screen. Hi and Vj limit the position of the compensation pattern on the liquid crystal display screen, and t represents the serial number of the compensation pattern used in the group of compensation patterns to which it belongs.

[0040] Figure 4 The flowchart of the frame rate control method according to the embodiments of the present disclosure is given. The frame rate control method includes the following steps.

[0041] In step S10, the grayscale data of multiple initial regions of the liquid crystal display screen are extracted from the grayscale data of the current frame, and multiple groups of compensation patterns are determined according to the low-order data of the grayscale data of the multiple initial regions.

[0042] In step S20, multiple initial compensation patterns are respectively selected from the corresponding multiple groups of compensation patterns, and the multiple initial compensation patterns are respectively corresponding to multiple initial regions of the liquid crystal display screen.

[0043] In step S30, starting from the multiple initial compensation patterns, in the group of compensation patterns to which each belongs, new compensation patterns are determined in the way of setting a step size by increasing or decreasing the serial number. At the same time, starting from the multiple initial regions, in the row direction and column direction of the liquid crystal display screen, the corresponding number of regions are incremented to locate to new regions, and the new compensation patterns are corresponding to the new regions. If the increase and / or decrease of the serial number causes the serial number to be negative or exceed the maximum value, it jumps to other valid serial numbers;

[0044] In step S40, compensation values are added to the grayscale data of the corresponding regions of the current frame according to the respective compensation patterns of the current frame, so as to apply data voltages to the display of the liquid crystal display device according to the compensated grayscale data.

[0045] This embodiment mainly determines the compensation patterns for the respective regions of the liquid crystal display screen, and uses the compensation patterns to adjust the grayscale data spatially to optimize the display effect. Specifically:

[0046] First, a plurality of initial regions are selected from the liquid crystal display screen, the grayscale data of the plurality of initial regions are respectively extracted from the grayscale data of the current frame, and respectively according to the low-order data of the grayscale data of the plurality of initial regions, a plurality of sets of compensation patterns respectively matching the plurality of initial regions are selected from a predefined plurality of sets of compensation patterns. Among them, each predefined set of compensation patterns corresponds to a possible value of the low-order data of the grayscale data of the initial region, each set of compensation patterns includes a plurality of compensation patterns, and the respective compensation patterns in each set of compensation patterns are sorted by serial number;

[0047] Then, an initial compensation pattern is respectively selected from each set of compensation patterns, and these initial compensation patterns are respectively corresponded to the respective initial regions of the liquid crystal display screen, that is, a specific compensation pattern is assigned to each initial region as the starting point of the compensation operation;

[0048] Next, starting from the initial compensation pattern, according to the rule of setting a step size by increasing or decreasing the serial number, new compensation patterns are determined. At the same time, on the liquid crystal display screen, starting from the initial region, along the row direction and the column direction, the corresponding regions are skipped with the set step size to locate to a new region, and the new compensation pattern is corresponded to the new region, and the above process is repeated until the entire liquid crystal display screen is covered by the compensation patterns. If the increase or decrease of the serial number causes the serial number to be negative or exceed the maximum value, it is processed as another valid serial number;

[0049] Finally, according to the compensation patterns of the respective regions determined in step S30, compensation values are added to the grayscale data of the corresponding regions of the current frame, and the grayscale data after adding the compensation values is converted into data voltages and applied to the liquid crystal display screen.

[0050] The following takes Figure 5 as an example to explain this embodiment in more detail. As Figure 5 shown, the yellow line delimits the range of the liquid crystal display screen. The four consecutive regions in the upper left corner of the liquid crystal display screen: , , and (corresponding to ) are 4 initial regions. The low-order data of the grayscale data of the current frame in these four initial regions are represented by x1, x2, x3, and x4. Four sets of compensation patterns , , , then arbitrarily select serial numbers t1, t2, t3, and t4, and the compensation scheme , , and are the initial compensation patterns for these 4 initial regions.

[0051] Then, starting from , locate the group in the row direction by incrementing s (s = 2) according to t1, and , , locate the compensation pattern group in the column direction by incrementing s (s = 2) according to t1. And starting from , , locate the regions in the row direction and column direction by incrementing s (s = 2) with , , , as the initial region. Then , , , are the compensation patterns for the regions , , , .

[0052] Then, taking as an example, it is to decrement s in the row direction but increment s in the column direction. Taking as an example, it is to increment s in the row direction but decrement s in the column direction. Taking as an example, it is to decrement s in both the row direction and column direction. Here, it will not be described in detail. When the incremented or decremented serial number exceeds the maximum serial number of a group of compensation patterns or is less than 0, it is processed as another valid serial number (for example, dividing the serial number value by the maximum serial number and taking the remainder, and if the result is negative, taking the absolute value again). Cover all the pixels of the entire liquid crystal display according to this rule. Figure 5 The yellow frame in

[0053] represents the resolution of the liquid crystal display, and the part outside the yellow frame is discarded. Figure 4 In some embodiments,

[0054] Figure 4 The current frames mentioned in the embodiments shown are successively the 1st frame to the Nth frame obtained from the frame sequence. And from the 1st frame to the Nth frame, the initial region and / or the initial compensation pattern of the current frame are successively changed. For example, the current region skips several regions each time in the row direction or the column direction.

[0054] In some embodiments, the number of groups of multiple compensation patterns and the number of compensation patterns within each group are determined based on the resolution of the liquid crystal display screen and the grayscale data of the current frame. More specifically, the grayscale data of each region and the size of the region satisfy the following formula: the number of (higher-order data + 1) of the grayscale data of the region = g * k / x, where x is the numerical value of the lower-order data, k represents the number of pixels occupied by one row of the compensation pattern (i.e., the width), and g represents the number of pixels occupied by one column of the compensation pattern (i.e., the length).

[0055] Figure 6 The flowchart of the frame rate control method according to an embodiment of the present disclosure is given. The frame rate control method realizes the grayscale level simulation in time and includes the following steps.

[0056] In step S610, a prime number is selected from P prime numbers less than N as the value of s.

[0057] In step S620, the first frame to the Nth frame are sequentially obtained from the frame sequence.

[0058] In step S630, multiple groups of compensation patterns are determined from a predefined multiple groups of compensation patterns according to the lower-order data of the grayscale data of multiple initial regions from the first frame to the Nth frame.

[0059] In step S640, for multiple initial regions from the first frame to the Nth frame, multiple initial compensation patterns are respectively selected from the corresponding multiple groups of compensation patterns, where the sequence numbers of the multiple initial compensation patterns in their respective groups increase according to s.

[0060] According to this embodiment, first, the first frame to the Nth frame are selected from the frame sequence, and then, according to the lower-order data of the grayscale data of multiple preset initial regions in the first frame to the Nth frame, multiple groups of compensation patterns respectively matching the multiple initial regions are selected from a predefined multiple groups of compensation patterns. Among them, each predefined group of compensation patterns corresponds to a possible value of the lower-order data of the grayscale data of the initial region, each group of compensation patterns contains multiple compensation patterns, and the respective compensation patterns in each group of compensation patterns are sorted by sequence number. Then, one initial compensation pattern is respectively selected from each group of compensation patterns, and these initial compensation patterns are respectively corresponding to the initial regions of the liquid crystal display screen, that is, a specific compensation pattern is assigned to each initial region as the starting point of the compensation operation. Among them, the sequence numbers of the compensation patterns of the initial regions at the same position in the first frame to the Nth frame in a group of compensation patterns increase or decrease according to s, and s is taken from the set of prime numbers less than N. For example, when N is equal to 8, the prime number combination is {1, 3, 5, 7}, and the sequence numbers of the compensation patterns of the first to the eighth frames change as shown in Table 1.

[0061] Table 1

[0062] A more intuitive example is as follows Figure 7 As shown, in small loop 1, the sequence numbers of the initial compensation patterns from the 1st frame to the Nth frame continuously increase by ta. In small loop 2, the sequence numbers of the initial compensation patterns from the 1st frame to the Nth frame continuously increase by tb until, in small loop 2, the sequence numbers of the initial compensation patterns from the 1st frame to the Nth frame continuously increase by tm. Small loops 1 to m form a large loop. Thus, each large loop will experience m * N frames.

[0063] It should be noted that Figure 4 and Figure 6 the embodiments of can be implemented in the same embodiment to complete frame rate control in terms of time and space.

[0064] The embodiments of the present disclosure also provide a frame rate control device applied to a liquid crystal display device, as Figure 8 shown, including a data parsing module 801, an adder 802, a pattern generator 803, a frame counter 805, a pixel counter 806, and a line counter 807.

[0065] As shown, the frame counter 805, the pixel counter 806, and the line counter 807 generate frame count, row position information, and column position information (i.e., pixel position information) by using externally input timing signals (such as horizontal synchronization hsync, vertical synchronization signal vsync, data valid signal de, and clock signal clk). The frame counter 805 can count the frame period using one of the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, and the data enable DE. For example, the frame count value is incremented by one every period of the vertical synchronization signal Vsync, so that the frame count value is accumulated each time a frame period elapses, thereby counting the frame period.

[0066] The data parsing module 801 is configured to parse the grayscale data of the input current frame, divide it into two parts, namely low-order data and high-order data, and then provide the low-order data to the pattern selector 803 and the high-order data to the adder 802.

[0067] The pattern generator 803 is configured to determine the compensation patterns for each region on the liquid crystal display screen, including: determining a set of compensation patterns from multiple sets of cached compensation patterns according to the low-order data of each region, and then selecting the corresponding sequence number of the compensation pattern from this set of compensation patterns according to the row position information and the column position information and obtaining the corresponding compensation pattern accordingly. Among them, in each row and each column of the liquid crystal display screen, starting from the sequence number of the initial compensation pattern in the initial region, the sequence numbers of the compensation patterns in the subsequent regions are obtained by incrementing or decrementing the set step length in the row direction and the column direction respectively.

[0068] An adder 802 is configured to determine whether to add a compensation value to each pixel of the input high-order data according to the compensation patterns corresponding to respective regions, and process accordingly. The adder 802 outputs the high-order data with or without the compensation value added according to the compensation pattern, and applies a data voltage to a display of a liquid crystal display device according to the data, thereby completing the display.

[0069] Correspondingly, an embodiment of the present disclosure further provides a liquid crystal display device, which includes a liquid crystal display and the frame rate control device described above.

[0070] In addition, an embodiment of the present disclosure further provides a computer-readable storage medium for storing one or more computer instructions, which, when executed, implement the frame rate control method mentioned above. Moreover, an embodiment of the present disclosure further provides a computing device, including a memory and a processor, where the memory stores one or more computer instructions, and when the computer instructions are executed by the processor, the frame rate control method mentioned above is implemented.

[0071] Although the embodiments of the present application are disclosed above as preferred embodiments, they are not intended to limit the claims. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be defined by the scope of the claims of the present application.

[0072] The foregoing are only preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for controlling a frame rate of a liquid crystal display, comprising: Extracting grayscale data of multiple initial areas of the liquid crystal display screen from the grayscale data of the current frame, and determining multiple groups of compensation patterns according to low-bit data of the grayscale data of the multiple initial areas, wherein the compensation patterns in each group of compensation patterns are sorted by sequence number; Selecting a plurality of initial compensation patterns from the corresponding plurality of groups of compensation patterns, respectively, the plurality of initial compensation patterns corresponding to the plurality of initial areas respectively; Starting from each initial compensation pattern, a new compensation pattern is determined in a group of compensation patterns in a manner of increasing or decreasing the set step size according to the sequence number, and starting from each initial area, a corresponding number of areas are increased in the row direction and the column direction of the liquid crystal display screen to locate the new area, and the new compensation pattern corresponds to the new area until the liquid crystal display screen is covered; A compensation value is added to the grayscale data of the corresponding area of ​​the current frame according to the compensation pattern of the corresponding area, so as to apply a data voltage to the liquid crystal display screen according to the grayscale data after the compensation value is added.

2. The frame rate control method according to claim 1, wherein: The number of the multiple initial regions and the multiple initial compensation patterns are both 4, and each initial region is incremented by two regions each time to locate the new region, and the new compensation pattern is determined in a sequence number incremented or decremented by 2.

3. The frame rate control method according to claim 1 or 2, wherein: The method of setting the step size by increasing or decreasing the serial number includes: the serial number increases in both the row direction and the column direction, the serial number increases in the row direction and decreases in the column direction, decreases in the row direction and increases in the column direction, and decreases in the row direction and decreases in the column direction.

4. The frame rate control method according to claim 1, further comprising: The current frames are the 1st frame to the Nth frame sequentially obtained from the frame sequence, and the frame rate control method further includes: changing the initial area and / or the initial compensation pattern in the 1st frame to the Nth frame.

5. The frame rate control method according to claim 4, wherein: The serial numbers of the initial compensation patterns of the initial areas in the 1st frame to the Nth frame in the group of compensation patterns to which they belong are increased or decreased according to s, and s is taken from P prime numbers less than N.

6. The frame rate control method according to any one of claims 1 to 3, wherein: If the new serial number obtained by setting the step size by increasing and / or decreasing the serial number is greater than the maximum serial number in the group of compensation patterns to which it belongs or is a negative number, the valid serial number is obtained by taking the modulus of the number of compensation patterns in the group of compensation patterns to which it belongs. If the result is negative, the absolute value is taken again.

7. The frame rate control method according to claim 4, wherein: The changing at least one of the plurality of initial regions in the first frame to the Nth frame includes: the initial region in the first frame to the Nth frame moves to a next region according to a set step size.

8. The frame rate control method according to claim 1, wherein: The number of the plurality of groups of compensation patterns and the number of compensation patterns in each group are determined according to the resolution of the liquid crystal display screen and the grayscale data of the current frame.

9. A frame rate control method for a liquid crystal display screen, the frame rate control method cyclically performing the following initial compensation pattern selection operation: Obtain the 1st frame to the Nth frame from the frame sequence in sequence; Determine multiple groups of compensation patterns according to low-bit data of grayscale data of multiple initial areas in the first frame to the Nth frame, and the compensation patterns in each group of compensation patterns are arranged in order; Selecting a plurality of initial compensation patterns from the plurality of groups of compensation patterns in each frame, respectively, the plurality of initial compensation patterns corresponding to the plurality of initial areas respectively; in, The serial numbers of the compensation patterns of the initial area at the same position in the first frame to the Nth frame in the corresponding compensation pattern group are increased or decreased according to s, where s is selected from a set of prime numbers less than N.

10. A frame rate control device in a liquid crystal display device, comprising: A data analysis module is used to analyze the grayscale data of the current frame and divide it into low-bit data and high-bit data; a pixel counter for generating column position information; A row counter, used to generate row position information; A pattern generator, for determining a group of compensation patterns from a plurality of groups of compensation patterns cached according to low-bit data of each initial area of ​​a current frame, and then selecting a corresponding initial compensation pattern from the group of compensation patterns; and starting from each initial compensation pattern, in a group of compensation patterns to which it belongs, determining a new compensation pattern by setting a step size in increment or decrement of the sequence number, and starting from each initial area, locating a new area by incrementing a corresponding number of areas in the row direction and the column direction of the liquid crystal display screen based on the row position information and the column position information, the new compensation pattern corresponds to the new area until the liquid crystal display screen is covered; The adder is used to determine whether to add a compensation value to each pixel of the high-bit data according to the compensation pattern corresponding to each area, and process accordingly.

11. The frame rate control device according to claim 10, wherein: Also includes: A frame counter is used to obtain a frame count, and the current frame is the 1st frame to the Nth frame obtained in sequence from the frame sequence. The pattern generator also includes: changing the initial area and / or the initial compensation pattern in the 1st frame to the Nth frame according to the frame count.

12. The frame rate control device according to claim 11, wherein: The serial numbers of the initial compensation patterns of the initial areas in the 1st frame to the Nth frame in the compensation pattern group to which they belong are increased or decreased according to s, and s is taken from P prime numbers less than N.

13. The frame rate control device according to claim 10, wherein: The pattern generator determines four initial areas and four initial compensation patterns. The pattern generator obtains the new compensation pattern for the four initial compensation patterns in a manner in which the serial numbers increase in both row and column directions, the serial numbers increase in the row direction and decrease in the column direction, the serial numbers decrease in the row direction and increase in the column direction, and the serial numbers decrease in the row direction and decrease in the column direction.

14. A liquid crystal display device, comprising: A frame rate control device as claimed in any one of claims 10 to 13.

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