CN116524851B - LED display driving method, LED display driving chip and device and display panel - Google Patents

LED display driving method, LED display driving chip and device and display panel Download PDF

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CN116524851B
CN116524851B CN202310810815.5A CN202310810815A CN116524851B CN 116524851 B CN116524851 B CN 116524851B CN 202310810815 A CN202310810815 A CN 202310810815A CN 116524851 B CN116524851 B CN 116524851B
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pointer
gray
sequence number
subframe
value
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CN116524851A (en
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雷靖
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Jichuang North Chengdu Technology Co ltd
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Jichuang North Chengdu Technology Co ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

The application discloses an LED display driving method, an LED display driving chip, an LED display driving device and a display panel, wherein the LED display driving method comprises the following steps: judging whether the total gray value of the target frame is larger than a gray threshold value, wherein the total gray value of the target frame comprises integer gray and decimal gray; when the total gray value of the target frame is greater than the gray threshold, the decimal gray is allocated to a preset subframe, and integer gray is allocated to the rest subframes. According to the LED display driving method, the LED display driving chip, the LED display driving device and the display panel, when the total gray value of the target frame is a high gray value, decimal gray is displayed in the preset subframe, and the rest subframes can display integer gray, so that the time of existence of a multiphase clock is reduced, and the overall power consumption is further reduced.

Description

LED display driving method, LED display driving chip and device and display panel
Technical Field
The application relates to the technical field of LED display, in particular to an LED display driving method, an LED display driving chip, an LED display driving device and a display panel.
Background
With the development of small-pitch LEDs and Mini LED technologies, the small-pitch LEDs and the Mini LED technologies have higher requirements on the display effect, the power consumption and the like of the LED driving chip. The display algorithm used by the LED driving chip plays a key role in the display effect of the LED screen, and is also helpful for reducing the power consumption of the driving chip.
At present, an SPWM (sinusoidal-PWM) display algorithm is mostly adopted by an LED driving chip to control the display of an LED screen. Unlike the centralized display of the PWM display algorithm, the SPWM algorithm equally divides the time of a frame into a plurality of groups, and then breaks up the on-time of a frame into multiple segments, which are evenly distributed to the groups for display. By means of grouping display, the SPWM algorithm improves the refresh rate, reduces the display clock frequency and improves the display effect.
However, with the original SPWM display algorithm, there would be a fractional gray scale for each group, i.e., each group would require a phase display clock. In one frame time, the display clock frequency is changed to 1/a, but the number of display clocks is changed to a, and the overall power consumption is not reduced.
Disclosure of Invention
In view of the above problems, the present invention aims to provide an LED display driving method, an LED display driving chip, an LED display driving device, and a display panel, which can reduce the time for which a multiphase clock exists, effectively reduce power consumption, and improve low-gray display effect.
According to a first aspect of the present invention, there is provided an LED display driving method comprising: judging whether the total gray value of the target frame is larger than a gray threshold value, wherein the total gray value of the target frame comprises integer gray and decimal gray; when the total gray value of the target frame is greater than the gray threshold, the decimal gray is allocated to a preset subframe, and integer gray is allocated to the rest subframes.
Optionally, before the step of determining whether the total gray value of the target frame is greater than the gray threshold, the method further includes: acquiring a non-break threshold, the number of subframes and preset subframes, wherein the number of subframes is the number of subframes contained in a target frame; obtaining a first pointer sequence number according to the number of the subframes and a second pointer sequence number according to the first pointer sequence number, wherein the first pointer sequence number is used for representing the subframe sequence number, and the second pointer sequence number is used for representing the priority of the subframe allocation gray value; wherein, the smaller the second pointer sequence number is, the higher the priority of the assigned gray value is.
Optionally, the preset subframe is one subframe of a plurality of subframes of the target frame.
Optionally, the method further comprises: and acquiring the total gray value of the target frame, setting the first pointer sequence number to 0, and acquiring the second pointer sequence number of the target frame according to the first pointer sequence number of the target frame.
Optionally, when the total gray value of the target frame is greater than the gray threshold, the step of assigning the fractional gray to a preset subframe and assigning the integer gray to the remaining subframes includes: dividing the total gray value of the target frame by the non-break threshold to obtain a second quotient and a second remainder, and dividing the second quotient by the number of subframes to obtain a third quotient and a third remainder; judging whether the second remainder is equal to 0; when the second remainder is not equal to 0, determining the display gray level of the current subframe according to the relation between the second pointer sequence number and the preset subframe and the relation between the second pointer sequence number and the third remainder; and when the second remainder is equal to 0, determining the display gray level of the current subframe according to the relation between the second pointer number and the third remainder.
Optionally, when the second remainder is not equal to 0, the step of determining the display gray level of the current subframe according to the relationship between the second pointer number and the preset subframe and the relationship between the second pointer number and the third remainder includes: judging whether the second pointer sequence number corresponds to the preset subframe or not; and when the second pointer sequence number corresponds to the preset subframe, adding a second remainder to the product of a third quotient and the non-break threshold value to be used as the display gray level of the current subframe.
Optionally, the method further comprises: when the second pointer sequence number does not correspond to the preset subframe, judging whether a third remainder is larger than or equal to the second pointer sequence number; when the third remainder is greater than or equal to the second pointer sequence number, taking the product of the third quotient added with 1 and the non-break threshold value as the display gray level of the current subframe; and when the third remainder is not more than the second pointer sequence number, taking the product of the third quotient and the non-scattering threshold value as the display gray level of the current subframe.
Optionally, when the second remainder is equal to 0, the step of determining the display gray level of the current subframe according to the relationship between the second pointer number and the third remainder includes: judging whether the third remainder is larger than a second pointer sequence number; when the third remainder is larger than the second pointer sequence number, taking the product of the third quotient added with 1 and the non-break threshold value as the display gray level of the current subframe; and when the third remainder is not greater than the second pointer sequence number, taking the product of the third quotient and the non-break threshold as the display gray level of the current subframe.
Optionally, the method further comprises: and when the total gray value of the target frame is not greater than the gray threshold value, determining the gray value of each subframe of the target frame based on the total gray value of the target frame, the non-scattering threshold value and the second pointer sequence number.
Optionally, the step of determining the gray value of each subframe of the target frame based on the total gray value of the target frame, the non-break threshold, and the second pointer number includes: dividing the total gray value of the target frame by the non-break threshold to obtain a first quotient and a first remainder; and determining the display gray level of the current subframe according to the relation between the first quotient and the second pointer sequence number.
Optionally, the step of determining the display gray level of the current subframe according to the relationship between the first quotient and the second pointer number includes: judging whether the first quotient is larger than the second pointer sequence number; when the first quotient is larger than the second pointer sequence number, the non-break threshold value is used as the display gray level of the current subframe; when the first quotient is not greater than the second pointer sequence number, judging whether the first quotient is equal to the second pointer sequence number; when the first quotient is equal to the second pointer number, taking the first remainder as the display gray level of the current subframe; when the first quotient is not equal to the second pointer number, zero is taken as the display gray of the current subframe.
Optionally, after determining the display gray level of the current subframe, the method further includes: and adding 1 to the first pointer sequence number, and obtaining a second pointer sequence number according to the first pointer sequence number after adding 1.
Optionally, the method further comprises: judging whether the number of the second pointer is larger than or equal to the number of subframes; when the number of the second pointer is larger than or equal to the number of subframes, executing the steps of acquiring the total gray value of the target frame and the following steps; when the number of the second pointer is not more than the number of subframes, a step of judging whether the total gray value of the target frame is more than a gray threshold value and the following steps are executed.
Optionally, the gray threshold is obtained according to the non-break-up threshold and the number of subframes.
Optionally, the gray level non-scattering threshold value is a natural number greater than 1 when the low gray level non-scattering is turned on, and is 1 when the low gray level non-scattering is turned on.
Optionally, the step of obtaining the second pointer sequence number according to the first pointer sequence number includes: acquiring a first pointer sequence number corresponding to a subframe sequence number; converting the first pointer sequence number from a decimal value to a binary value; performing high-low turning operation on the binary number value corresponding to the first pointer sequence number to obtain a binary number value corresponding to the second pointer sequence number; and converting the binary value corresponding to the second pointer sequence number into a decimal value.
Optionally, after the step of converting the binary value corresponding to the second pointer sequence number into the decimal value, the method further includes: judging whether the decimal value corresponding to the converted second pointer sequence number is smaller than the number of subframes or not; if the decimal value corresponding to the converted second pointer sequence number is smaller than the number of subframes, the decimal value corresponding to the converted second pointer sequence number is the second pointer sequence number; if the decimal value corresponding to the converted second pointer sequence number is not less than the number of subframes, repeating the step of obtaining the second pointer sequence number according to the first pointer sequence number after the first pointer sequence number corresponding to the subframe sequence number is increased.
Optionally, the gray threshold is a product of a non-break up threshold and a low gray subframe number.
Optionally, the number of low gray subframes is the number of subframes for displaying decimal gray scale when the total gray scale value of the target frame is a low gray scale value.
According to another aspect of the present invention, there is provided an LED display driving chip for performing the LED display driving method as described above.
According to still another aspect of the present invention, there is provided a display panel connected to the driving output terminal of the LED display driving chip described above.
According to still another aspect of the present invention, there is provided an LED display driving apparatus including a display panel and an LED display driving chip for performing the above-described LED display driving method.
According to the LED display driving method, the LED display driving chip, the LED display driving device and the display panel, when the total gray value of the target frame is a high gray value, decimal gray is displayed in a preset subframe, and other subframes only can display integer gray. Only one subframe needs a multi-phase display clock in one frame time, and the rest subframes only need one phase display clock. Although the number of multiphase clocks for displaying decimal gray scale is not changed, the time in which the multiphase clocks exist can be reduced. The aim of reducing the overall power consumption is achieved by greatly reducing the time of existence of the multiphase clock.
Further, the decimal gray scale is distributed to a certain number of subframes for display when the gray scale is low, and the decimal gray scale is placed in a certain subframe for display when the gray scale is high. Although a small part of power consumption is sacrificed, the low gray display effect is improved, and both the power consumption and the low gray display effect are achieved.
Further, no matter the total gray value of the target frame is a low gray value or a high gray value, after the threshold value is determined to be not broken, the total gray value is distributed into a plurality of subframes according to a dichotomy method for displaying, and therefore the display effect is improved.
Further, the LED display driving method, the LED display driving chip, the LED display driving device and the display panel provided by the application are suitable for the situation that the decimal PWM is started and the situation that the decimal PWM is not started. The problem of poor low gray display effect can still be solved without turning on the fractional PWM.
Drawings
The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic diagram of a prior art PWM and SPWM drive method;
FIG. 2 is a schematic diagram of a driving method of each sub-frame of a target frame in the prior art SPWM driving method;
FIG. 3 shows a flow chart of an LED display driving method of an embodiment of the present application;
FIG. 4 is a flowchart of a method for displaying gray scale in a subframe when the total gray scale value K is not greater than the gray scale threshold value according to an embodiment of the present application;
FIG. 5 is a flowchart of a method for displaying gray scale in a subframe when the total gray scale value K is greater than the gray scale threshold and the total gray scale value is divisible by the non-break-up threshold in an embodiment of the present application;
FIG. 6 is a flowchart of a method for displaying gray scale in a subframe when the total gray scale value K is greater than the gray scale threshold and the total gray scale value is not divisible by the non-break-up threshold in an embodiment of the present application;
Fig. 7 is a schematic diagram showing a change rule of generating a second pointer sequence number according to a subframe sequence number and a first pointer sequence number in an embodiment of the present application.
Detailed Description
Various embodiments of the present application will be described in more detail below with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts. For clarity, the various features of the drawings are not drawn to scale.
In order to facilitate a better understanding of the present application, technical terms related to the present application will be briefly described below.
Target frame picture: the display screen is a picture to be displayed of the LED display screen. Such as a video screen, an advertisement screen, a monitoring screen, a broadcast screen, etc.
The gray threshold is a parameter determined based on the gray non-break threshold and the decimal gray level for comparing with the total gray value in the target frame picture to determine whether the target frame total gray value is a high gray value or a low gray value. In general, if the total gray value of the target frame is greater than the gray threshold, the total gray value of the target frame belongs to a high gray value.
And the gray scale growth sequence number is a parameter which characterizes the gray scale of the subframe picture and is determined based on the subframe sequence number of the subframe picture. In the embodiment of the application, the smaller the gray growth sequence number is, the higher the gray distribution priority is, and the larger the probability that the sub gray value of the sub-frame picture is not 0 is.
It should be noted that references to "first," "second," etc. in this disclosure are for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that such terms are interchangeable under appropriate circumstances such that the embodiments described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
After technical terms related to the application are introduced, application scenes and design ideas of the embodiment of the application are briefly introduced.
In general, human eyes have a certain persistence threshold, when the time interval between two frames of pictures displayed by the LED display screen exceeds the persistence threshold, the human eyes feel a certain degree of picture flickering, and in order to avoid the problem as much as possible, the time interval between each adjacent LED lamp bead on time period should be as small as possible.
In one embodiment, assuming the original frame rate is 60Hz, if a PWM algorithm is employed, the refresh rate is 60Hz. However, if the SPWM algorithm is adopted, if the number of subframes of a frame is 2, the refresh rate is 120Hz; if the number of subframes of one frame is 32, the refresh rate is 1920Hz. The method comprises the steps of breaking the on time of a frame into a plurality of sections, adopting a low-ash non-breaking technology, setting a non-breaking threshold value, and when the gray value is not larger than the non-breaking threshold value, not breaking the gray value for display, but intensively placing the gray value in a certain subframe for display; when the gray level is larger than the non-scattering threshold, dividing the gray level value by the non-scattering threshold, uniformly distributing the integer part to each subframe according to a dichotomy for displaying, and distributing the remainder part to a certain subframe for displaying. As shown in fig. 1, when the display gray scale is 7, if the PWM technique is adopted, it is concentrated; if the SPWM technique is used, assuming that the number of subframes is 4 and the non-break threshold is 2, gray 2 will be displayed in subframe 1, subframe 2 and subframe 3, and gray 1 will be displayed in subframe 4.
After dividing a display frame into a plurality of subframes, each bead in each row of the LED screen needs to display a respective gray level once in each subframe. Therefore, all rows are scanned once in each subframe, and the lamp beads of all channels in each row are displayed according to respective gray scales. Assuming that the LED array is S rows, each frame contains G subframes, as shown in fig. 2, the whole display process is: firstly, scanning a first row of the subframe 1 and a second row of the subframe 1 in sequence until all S rows of the subframe 1 are scanned; then the first row of subframe 2, the second row … … of subframe 2, and so on, until all G subframes are scanned, and then the picture of the next frame is displayed.
The display time of one gray is the period of the display clock, and when the gray level is I, the line scanning number is S, the frame frequency is P, and the display effective rate is E, the minimum display clock frequency f=2 I * S.times.P/E, in Hz. It can be seen that as the gray scale, the number of scanning lines and the frame frequency are increased, the SPWM algorithm is realizedThe display clock frequency increases. For example, the gray level i=16, the line scan number s=64, the frame rate p=60, the display effective rate e=0.6, and the minimum display clock frequency f≡420Mhz. To achieve such high display clock frequencies, fractional PWM has emerged. Setting a decimal gray scale Q according to the actual display requirement and the parameters, wherein any display gray scale can be divided into decimal gray scale and integer gray scale, and the decimal gray scale is 0-2 Q An integer gray scale of 2 Q Is an integer multiple of (a). When the display gray is K, K/2 Q The integer part of (2) is an integer gray scale, and the remainder part is a fractional gray scale. Then the integer gray scale can be 1/2 of the original display clock frequency Q While the decimal gray scale is realized by the multi-phase clock generated by the display clock, wherein the number of the multi-phase clocks is equal to 2 Q . For example, when the display gray level k=17 and the fractional gray level q=3, the integer gray level is 2, the fractional gray level is 1, and the minimum display clock frequency f≡53Mhz in the above example is 8.
Although the above approach reduces the display clock frequency, if the original SPWM display algorithm is still used, there will be a fractional gray scale for each group, i.e., 2 is required for each group Q Display clocks of the respective phases. In one frame time, although the display clock frequency becomes 1/2 of the original Q However, the number of display clocks becomes 2 Q And, overall power consumption is not reduced.
In view of the above problems, an embodiment of the present application provides an LED display driving method, specifically, in a display process of an LED display screen, if a total gray value of a target frame belongs to a high gray value, decimal gray is displayed in a certain subframe, and other subframes only display integer gray. Only one subframe needs a multi-phase display clock in one frame time, and the rest subframes only need one phase display clock. Although the number of multiphase clocks for displaying decimal gray scale is not changed, the time in which the multiphase clocks exist can be reduced. The aim of reducing the overall power consumption is achieved by greatly reducing the time of existence of the multiphase clock
The following describes in further detail the embodiments of the present application with reference to the drawings and examples.
The embodiment of the application provides an LED display driving method which can be applied to an LED driving chip of any one of a light-emitting diode display screen, a micro light-emitting diode display screen, a mini light-emitting diode display screen, a quantum dot light-emitting diode display screen and an organic light-emitting diode display screen. The LED driving chip can be a universal driving chip suitable for the various display screens, and the universal driving chip is suitable for LED display panels with different LED lamp bead arrangements, so that the design cost and the manufacturing cost can be reduced.
FIG. 3 shows a flow chart of an LED display driving method of an embodiment of the present application; FIG. 4 is a flowchart of a method for displaying gray scale in a subframe when a total gray scale value K is less than or equal to a gray scale threshold value according to an embodiment of the present application; FIG. 5 is a flowchart of a method for displaying gray scale in a subframe when the total gray scale value K is greater than the gray scale threshold and the total gray scale value is divisible by the non-break-up threshold in an embodiment of the present application; FIG. 6 is a flowchart of a method for displaying gray scale in a subframe when the total gray scale value K is greater than the gray scale threshold and the total gray scale value is not divisible by the non-break-up threshold in an embodiment of the present application; fig. 7 is a schematic diagram showing a change rule of generating a second pointer sequence number according to a subframe sequence number and a first pointer sequence number in an embodiment of the present application.
Referring to fig. 3 to 7, an outline flow of the LED display driving method provided by the embodiment of the application is as follows:
step S101: and acquiring the non-scattering threshold M, the subframe number G and the preset subframe H.
In the step, the LED driving chip acquires a non-break-up threshold M (M is more than or equal to 1), a subframe number G (G is more than or equal to 1) and a preset subframe H aiming at a display picture of an LED display screen after initialization.
In this embodiment, the maximum display gray level of each sub-frame is determined by a non-break threshold M, which is obtained from fractional gray levels, M.gtoreq.2 Q The method comprises the steps of carrying out a first treatment on the surface of the The number of subframes G is the number of subframes included in the target frame; under the condition that the preset subframe H is that the total gray value K of the target frame is larger than the low gray threshold value, the subframe number of decimal gray can be displayed, and H isAny positive integer not greater than G.
Step S102: and obtaining a first pointer sequence number according to the number G of the subframes and obtaining a second pointer sequence number according to the first pointer sequence number.
In this step, the first pointer number is used to record the number of subframes G, and the first pointer number is, for example, N bits, where N is the number of binary bits corresponding to (G-1). Specifically, for example, the number of subframes g=5, the binary number corresponding to (G-1) =4 is 100, "1", "0" each calculated by one bit, and the total is 3 bits, where n=3; if the number of subframes g=12, the binary number corresponding to (G-1) =11 is 1011, "1", "0", "1", and "1" each of one bit, and 4 bits in total, where n=4.
Further, generating a second pointer sequence number of N bits according to the first pointer sequence number of N bits, wherein the second pointer sequence number is used for recording the gray scale growth sequence number corresponding to each subframe. The smaller the gradation growth number is, the higher the gradation assignment priority is, and the larger the probability that the gradation value of the sub-frame picture is not 0 is.
In the embodiment of the application, in order to uniformly scatter the total gray value of each LED lamp bead in the target frame picture as much as possible, the LED driving chip can also determine the gray growth sequence number of each subframe picture of the target frame picture based on the subframe sequence number of each subframe picture of the target frame picture before determining the subframe value of each subframe picture of the target frame picture in the LED display screen. That is, in the implementation, for each sub-frame of the target frame, the LED driving chip may perform the high-low level flipping operation on the binary number of the sub-frame number (the first pointer number) of the sub-frame to obtain the mirrored sub-frame number of the sub-frame, and then determine the second pointer number (the gray scale growth number) of the sub-frame based on the mirrored sub-frame number of the sub-frame. Specifically, if the mirrored subframe number of the subframe is determined to be smaller than the subframe number G, determining the mirrored subframe number of the subframe as the second pointer number of the subframe; if it is determined that the mirrored subframe number of the subframe is not smaller than the subframe number G, performing a sequence number increment operation on the first pointer sequence number corresponding to the subframe sequence number in an iterated manner until it is determined that the mirrored subframe number of the intermediate first pointer sequence number obtained by performing the sequence number increment operation is smaller than the subframe number G, determining the mirrored subframe number of the intermediate first pointer sequence number obtained by performing the sequence number increment operation last time as the gray scale growth sequence number of the subframe, where the sequence number increment operation includes increasing 1.
In one embodiment, the number of subframes of each target frame is G (G is an integer greater than 1), and when determining the second pointer number of each subframe of the target frame based on the subframe number of each subframe of the target frame, the LED driving chip may refer to the embodiment shown in fig. 7, specifically, but not limited to, the following manner may be adopted:
firstly, generating a first pointer sequence number with N bits; the number of sub-frames of each sub-frame of the target frame is calculated from 0, N is the binary number of (G-1), and the specific calculation method can refer to the foregoing.
Then, when the calculation of the gray scale growth sequence number of the first sub-frame of the target frame is started, the first pointer sequence number is set to 0 as the initial sub-frame sequence number, and when the calculation of the second pointer sequence numbers of other sub-frames of the target frame is started, the first pointer sequence number is added by 1 and then is used as the sub-frame sequence number.
Next, for each sub-frame of the target frame, performing a high-low level flipping operation on a binary number of a sub-frame number (first pointer number) of the sub-frame to obtain a mirrored sub-frame number of the sub-frame. For example, in the case where n=4, the first pointer number of the subframe is 6, the binary number is 0110, the high-low bit is 0110 after being flipped, and the corresponding decimal number is 6, i.e. the mirror subframe number of the subframe is 6. For another example, the first pointer number of the subframe is 14, the binary number is 1110, the high-low bit is 0111 after being flipped, and the decimal number is 7, i.e. the mirror subframe number of the subframe is 7. The mirrored subframe number is the second pointer number, and is also the gray scale growth number of the subframe picture.
Finally, comparing the mirror image sub-frame number of each sub-frame picture with the sub-frame number G for each sub-frame picture of the target frame picture; if the mirror sub-frame number of the sub-frame picture is smaller than the total number G of sub-frames, determining the mirror sub-frame number of the sub-frame picture as a second instruction number of the sub-frame picture; if it is determined that the mirrored subframe number of the subframe is greater than or equal to the subframe number G, performing a sequence number increment operation (for example, performing an increment of 1) on the first pointer sequence number of the subframe in an iterative manner until it is determined that the mirrored subframe number of the intermediate subframe number obtained by performing the sequence number increment operation (that is, the first pointer sequence number after performing the increment of 1 in an iterative manner) is less than the subframe number G, determining the mirrored subframe number of the intermediate subframe number obtained by performing the sequence number increment operation last time as the second pointer sequence number of the subframe.
Further, the LED driving chip can calculate the gray value in each sub-frame in the target frame of the LED display screen after determining the second index number of each sub-frame based on the sub-frame number of each sub-frame.
Step S103: and acquiring the total gray value K of the target frame, setting the first pointer sequence number to 0, and acquiring the corresponding second pointer sequence number.
In this step, the LED driving chip acquires the total gray value K of the target frame to be currently displayed.
Step S104: and judging whether the total gray value K is larger than a gray threshold value.
The gray threshold is a parameter for distinguishing whether the total gray value of the target frame is a high gray value or a low gray value, which is determined based on the non-break threshold M and the low gray subframe number R. In this embodiment, the low gray sub-frame number R represents R sub-frames preset for displaying fractional gray scale, R being a positive integer smaller than G, in the case where the target frame total gray scale value is a low gray scale value. Further, in this embodiment, the low gray subframe number R is uniformly distributed in subframes of the target frame.
In this embodiment, the gray threshold=the non-break threshold m×the number of low gray subframes R.
In this step, if the total gray value K is equal to or smaller than the gray threshold value, step S105 is performed; if the total gray value K is greater than the gray threshold, step S106 is performed.
Step S105: dividing the target frame total gray value K by the non-scattering threshold M to obtain a first quotient D1 and a first remainder T1.
In this step, when the target frame total gradation value K is equal to or less than the gradation threshold value, the first quotient D1 and the first remainder T1, that is, K/m=d1 … … T1 are obtained by dividing the target frame total gradation value K by the non-scattering threshold value M.
Step S106: dividing the target frame total gray value K by the non-scattering threshold M to obtain a second quotient D2 and a second remainder T2, and dividing the second quotient D2 by the number of subframes G to obtain a third quotient D3 and a third remainder T3.
In this step, if the target frame total gray value K is greater than the gray threshold, dividing the target frame total gray value K by the non-break threshold M to obtain a second quotient D2 and a second remainder T2, i.e., K/m=d2 … … T2; dividing the second quotient D2 by the number of subframes G yields a third quotient D3 and a third remainder T3, i.e. D2/g=d … … T3.
In this step, it is further determined whether the second remainder T2 is equal to 0, and if the second remainder T2 is equal to 0, step S108 is performed; if the second remainder T2 is not equal to 0, step S109 is performed.
Step S107: and determining the display gray level of the current subframe according to the size relation between the first quotient D1 and the second pointer sequence number.
In this step, the second pointer number actually represents the gray scale growth number corresponding to the current subframe number, and the display gray scale in the current subframe is determined according to the magnitude relation between the first quotient D1 and the gray scale growth number.
In this embodiment, since the total gray value K of the target frame is less than or equal to the gray threshold m×r, that is, the total gray value of the target frame belongs to a low gray value, in order to avoid poor low gray display effect, a plurality of decimal gray display subframes may be set. That is, in the case where the total gray value K of the target frame belongs to a low gray value, it is possible to set a certain number of subframes for displaying the decimal gray, while the subframes for displaying the decimal gray are uniformly distributed among G subframes of the entire target frame.
In this way, the problem of poor low-gray display effect can be solved, and meanwhile, as the subframe number for displaying the decimal gray is determined, the corresponding multiphase clock can be configured for the subframe for displaying the decimal gray, and other subframes only need one clock, so that a part of power consumption can be reduced, namely, the effects of power consumption and low-gray display are achieved.
In this embodiment, the step of determining the display gradation at the current sub-frame according to the magnitude relation of the first quotient D1 and the second pointer number includes the following:
step S1071: it is determined whether the first quotient D1 is greater than the second pointer number.
In this step, if the first quotient D1 is greater than the second pointer number, step S1072 is performed; if the first quotient D1 is not greater than the second pointer number, step S1073 is performed.
Step S1072: and taking M as the display gray of the current subframe.
Step S1073: it is determined whether the first quotient D1 is equal to the second pointer number.
In this step, if the first quotient D1 is equal to the second pointer number, step S1074 is performed; if the first quotient D1 is not equal to the second pointer number, step S1075 is performed.
Step S1074: and taking T1 as the display gray level of the current subframe.
Step S1075: and taking 0 as the display gray level of the current subframe.
In the embodiment shown in fig. 4, for example, the threshold m=4 is not broken, the number of subframes g=12, the number of low gray subframes r=4, and if the preset subframe is the first subframe, i.e. h=1, the binary number of the first pointer sequence number is 4, i.e. n=4, and the first pointer sequence number and the second pointer sequence number of 4 bits are generated.
If the total gray value k=9 of the target frame satisfies K less than or equal to m×r, that is, the total gray value K is less than or equal to 16, calculating K/m=d1 … … T1 according to the method of step S105, to obtain a first quotient d1=2 and a first remainder t1=1.
If the frame is the first subframe of the target frame, the first pointer number is 0, the second pointer number is 0, the first quotient D1 satisfies that the first quotient D is greater than the second pointer number by 0, and the gray level is displayed in the first subframe as m=4.
If the frame is the second subframe of the target frame, the first pointer number is 1, the second pointer number is 8, the first quotient D1 does not satisfy that the frame is larger than the second pointer number 8, and the first quotient D1 is equal to the second pointer number 8, so that the gray scale is displayed in the second subframe as 0.
If the frame is the fourth subframe of the target frame, the first pointer number is 3, the second pointer number is 2, and the first quotient D1 does not satisfy that the first quotient D1 is greater than the second pointer number by 2, but satisfies that the first quotient D1 is equal to the second pointer number by 2, so that the gray level is displayed in the second subframe with the first remainder t1=1.
That is, when k=9, the first and seventh subframes display a gray level of m=4, the fourth subframe displays a gray level of a first remainder t1=1, and the remaining subframes do not display or display a gray level of 0.
Step S108: and determining the display gray level of the current subframe according to the size relation between the third remainder T3 and the second pointer sequence number.
In this step, the second remainder t2=0, that is, the total gray value K representing the target frame is an integer multiple of the non-break-up threshold M, that is, there is no decimal gray. In this step, the display gray level in the current subframe is determined based on the magnitude relation between the third remainder T3 and the gray level growth sequence number which is the second pointer sequence number.
In this embodiment, the step of determining the display gray level at the current subframe according to the magnitude relation of the third remainder T3 and the second pointer number includes the following:
step S1081: it is determined whether the third remainder T3 is greater than the second pointer number.
In this step, if the third remainder T3 is greater than the second pointer number, step S1082 is performed; if the third remainder T3 is not greater than the second pointer number, step S1083 is performed.
Step S1082: and taking (D3+1) M as the display gray level of the current subframe.
Step S1083: d3 x M is taken as the display gray of the current subframe.
In the embodiment shown in fig. 5, for example, the threshold m=4 is not broken, the number of subframes g=12, the number of low gray subframes r=4, and if the preset subframe is the first subframe, i.e. h=1, the binary number of the first pointer sequence number is 4, i.e. n=4, and the first pointer sequence number and the second pointer sequence number of 4 bits are generated.
If the total gray value k=20 of the target frame satisfies K > m×r, that is, the total gray value K is greater than 16, calculating K/m=d2 … … T2 according to the method of step S106, to obtain a second quotient d2=5, and a second remainder t2=0; d2/g=d3 … … T3, yielding a third quotient d3=0, a third remainder t3=5.
If the frame is the first subframe of the target frame, the first pointer number is 0, the second pointer number is 0, the third remainder t3=5 satisfies that the third remainder t3=5 is greater than the second pointer number of 0, and the gray scale is (d3+1) ×m=4 in the first subframe.
If the frame is the second subframe of the target frame, the first pointer number is 1, the second pointer number is 8, and the third remainder t3=5 is not greater than the second pointer number of 8, so that the gray level is d3×m=0 in the second subframe.
That is, when k=20, the first, third, fourth, seventh, and tenth subframes display gray scales of (d3+1) ×m=4, and the remaining subframes display gray scales of d3×m=0.
Step S109: and determining the display gray level of the current subframe according to the size relation between the second pointer sequence number and the preset subframe H and the size relation between the third remainder T3 and the second pointer sequence number.
In this step, the second remainder t2+.0, i.e. the total gray value K representing the target frame is not an integer multiple of the non-break threshold M, i.e. there is a fractional gray. In this step, the display gray level in the current subframe is determined according to the size relation between the second pointer number and the preset subframe H and the size relation between the third remainder T3 and the second pointer number, i.e., the gray level growth number.
In this embodiment, since the total gray value K of the target frame is greater than the gray threshold m×r, that is, the total gray value of the target frame belongs to a high gray value, in order to reduce power consumption, a certain preset subframe H may be set as a decimal gray display subframe. That is, in the case where the total gray value K of the target frame belongs to a high gray value, the preset subframe H may be used to display a fractional gray, and the other subframes display integer gray. In this embodiment, if the preset subframe is the first frame of the target frame, h=1; if the preset subframe is the fifth frame of the target frame, h=5, and H is different according to the difference of the preset subframes.
In this way, not only the display effect can be improved, but also the power consumption can be reduced because only one subframe is used for displaying the decimal gray scale, the corresponding multiphase clock can be configured for the preset subframe H for displaying the decimal gray scale, and only one clock is needed for other subframes.
In this embodiment, the step of determining the display gray level in the current subframe according to the size relation between the second pointer number and the preset subframe H and the size relation between the third remainder T3 and the second pointer number includes the following steps:
step S1091: and judging whether the second pointer sequence number is equal to the second pointer sequence number corresponding to the preset subframe H.
In this step, if the second pointer number is equal to the second pointer number corresponding to the preset subframe H, step S1092 is executed; if the second pointer number is not equal to the second pointer number corresponding to the preset subframe H, step S1093 is performed.
Step S1092: d3×m+t2 is taken as the display gray level of the current subframe.
Step S1093: and judging whether the third remainder T3 is larger than or equal to the second pointer sequence number.
In this step, if the third remainder T3 is greater than or equal to the second pointer number, step S1094 is performed; if the third remainder T3 is not greater than or equal to the second pointer number, step S1095 is performed.
Step S1094: (d3+1) M is taken as the display gray level of the current subframe.
Step S1095: d3 x M is taken as the display gray of the current subframe.
In the embodiment shown in fig. 6, for example, the threshold m=4 is not broken, the number of subframes g=12, the number of low gray subframes r=4, the preset subframe H is the first subframe, i.e. h=1, the binary number of the first pointer sequence number is 4, i.e. n=4, the first pointer sequence number and the second pointer sequence number of 4 bits are generated, and the second pointer sequence number corresponding to the preset subframe H is 0.
If the total gray value k=21 of the target frame satisfies K > m×r, that is, the total gray value K is greater than 16, calculating K/m=d2 … … T2 according to the method of step S106, to obtain a second quotient d2=5, and a second remainder t2=1; d2/g=d3 … … T3, yielding a third quotient d3=0, a third remainder t3=5.
If the frame is the first subframe of the target frame, the first pointer number is 0, the second pointer number is 0, and since the second pointer number is 0, that is, the second pointer number is equal to the second pointer number corresponding to the preset subframe H, the gray scale is displayed in the first subframe as d3×m+t2=1, that is, the decimal gray scale is displayed in the first subframe.
If the frame is the second subframe of the target frame, the first pointer number is 1, the second pointer number is 8, and since the second pointer number is not equal to the second pointer number corresponding to the preset subframe H, and the third remainder t3=5 does not satisfy the requirement of being greater than or equal to the second pointer number 8, the gray level is displayed in the second subframe as d3×m=0.
If the frame is the third subframe of the target frame, the first pointer number is 2 and the second pointer number is 4, and since the second pointer number is not equal to the second pointer number corresponding to the preset subframe H and the third remainder t3=5 is greater than the second pointer number of 4, the gray scale is (d3+1) ×m=4 in the third subframe.
That is, when k=21, the third, fourth, seventh, ninth, and tenth subframes display gray scales of (d3+1) ×m=4, the first subframe displays gray scales of d3×m+t2=1, and the remaining subframes display gray scales of d3×m=0.
In another embodiment, if the threshold m=4 is not broken, the number of subframes g=12, the number of low gray subframes r=4, and the preset subframe H is the second subframe, i.e. h=2, the binary bit number of the first pointer sequence number is 4, i.e. n=4, and the first pointer sequence number and the second pointer sequence number of 4 bits are generated, and the second pointer sequence number corresponding to the preset subframe H is 8.
If k=21, the second frame is the target frame, and the second index number is equal to the second index number corresponding to the preset subframe H, the gray scale is displayed in the second subframe as d3×m+t2=1, that is, the decimal gray scale is displayed in the second subframe.
Therefore, according to the difference of the preset subframes H, the display subframes of decimal gray scale in the case of high gray threshold can be changed.
In the embodiment shown in fig. 6, for example, a preset subframe h=1, that is, a subframe displaying the fractional gray scale is set as the first subframe, and the condition for determining whether the fractional gray scale is displayed in the subframe in step S1091 may be modified to "determine whether the second pointer number is equal to 0"; if the preset subframe h=4, that is, the fourth subframe is used for displaying the decimal gray level, the second pointer number corresponding to the preset subframe H is 2, so the determination condition in step S1091 needs to be modified to "determine whether the second pointer number is equal to 2".
Therefore, in the LED display driving method provided by the present application, when the total gray value of the target frame belongs to the high gray value, a certain subframe may be arbitrarily set as the display frame of the decimal gray, and only the judgment step in the step S1091 needs to be correspondingly modified.
Step S110: the first pointer sequence number is added with 1 and a corresponding second pointer sequence number is obtained.
In this step, the calculation and display of the display gradation of the sub-frame corresponding to the previous step have been completed, and the calculation and display of the gradation of the next sub-frame is performed, so that the first pointer number is increased by 1, indicating that the calculation and display of the gradation of the next sub-frame is performed subsequently.
Further, since the first pointer number changes, the second pointer number also changes accordingly, and it is necessary to obtain the second pointer number from the changed first pointer number.
Step S111: and judging whether the second pointer sequence number is larger than or equal to the number G of subframes.
In this step, if the first pointer number is greater than or equal to the number of subframes G, indicating that all subframes of the current target frame are displayed, the next target frame is displayed, so step S103 is performed; if the first pointer number is not greater than or equal to the number of subframes G, indicating that all subframes of the current target frame are not completely displayed, the next subframe of the target frame needs to be displayed, so step S104 is performed.
In a specific embodiment, the LED driving chip may generate SPWM pulses in each sub-frame of the target frame based on the gray value of each sub-frame of the target frame, so that the LED driving chip drives the LED display screen to sequentially display each sub-frame of the target frame according to the SPWM pulses corresponding to each sub-frame, thereby completing the driving operation for displaying the target frame on the LED display screen.
In practical application, when the LED driving chip drives each sub-frame picture of the target frame picture, each sub-frame picture is sequentially driven, and in each sub-frame picture, each row of LED lamp beads alternately displays respective sub-gray scale, for example, first displaying a first row of the first sub-frame picture, and then displaying a second row and a third row … … of the first sub-frame until all rows of the first sub-frame are displayed; then displaying the first row and the second row … … of the second subframe until all rows of the second subframe are displayed; and the like, and driving the next target frame picture after all the sub-frame images of the target display frame are displayed.
Furthermore, the application also provides an LED display driving chip, which is used for executing the LED display driving method.
Furthermore, the application also provides a display panel which is connected with the driving output end of the LED display driving chip.
The application further provides an LED display driving device, which comprises a display panel and an LED display driving chip, wherein the LED display driving chip drives the display panel according to the LED display driving method.
According to the LED display driving method, the LED display driving chip, the LED display driving device and the display panel, when the total gray value of the target frame is a high gray value, decimal gray is displayed in a certain subframe, and other subframes only display integer gray. Only one subframe needs a multi-phase display clock in one frame time, and the rest subframes only need one phase display clock. Although the number of multiphase clocks for displaying decimal gray scale is not changed, the time in which the multiphase clocks exist can be reduced. The aim of reducing the overall power consumption is achieved by greatly reducing the time of existence of the multiphase clock.
Further, the decimal gray scale is distributed to a certain number of subframes for display when the gray scale is low, and the decimal gray scale is placed in a certain subframe for display when the gray scale is high. Although a small part of power consumption is sacrificed, the low gray display effect is improved, and both the power consumption and the low gray display effect are achieved.
Further, no matter the total gray value of the target frame is a low gray value or a high gray value, after the threshold value is determined to be not broken, the total gray value is distributed into a plurality of subframes according to a dichotomy method for displaying, and therefore the display effect is improved.
Further, the LED display driving method, the LED display driving chip, the LED display driving device and the display panel provided by the application are suitable for the situation that the decimal PWM is started and the situation that the decimal PWM is not started. The problem of poor low gray display effect can still be solved without turning on the fractional PWM.
Embodiments in accordance with the present application, as described above, are not intended to be exhaustive or to limit the application to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best utilize the application and various modifications as are suited to the particular use contemplated. The application is limited only by the claims and the full scope and equivalents thereof.

Claims (19)

1. An LED display driving method, comprising:
Judging whether the total gray value of the target frame is larger than a gray threshold value, wherein the total gray value of the target frame comprises integer gray and decimal gray;
when the total gray level value of the target frame is greater than the gray level threshold, the decimal gray level is allocated to a preset subframe, and integer gray levels are allocated to the remaining subframes,
wherein the gray threshold is the product of a non-break threshold and the number of low gray subframes; the number of the low gray subframes is the number of subframes for displaying decimal gray when the total gray value of the target frame is a low gray value.
2. The LED display driving method according to claim 1, wherein before the step of determining whether the total gray value of the target frame is greater than the gray threshold value, further comprising:
acquiring a non-break threshold, the number of subframes and preset subframes, wherein the number of subframes is the number of subframes contained in a target frame;
obtaining a first pointer sequence number according to the number of the subframes and a second pointer sequence number according to the first pointer sequence number, wherein the first pointer sequence number is used for representing the subframe sequence number, and the second pointer sequence number is used for representing the priority of the subframe allocation gray value;
wherein, the smaller the second pointer sequence number is, the higher the priority of the assigned gray value is.
3. The LED display driving method according to claim 2, wherein the preset subframe is one of a plurality of subframes of the target frame.
4. The LED display driving method according to claim 2, further comprising: and acquiring the total gray value of the target frame, setting the first pointer sequence number to 0, and acquiring the second pointer sequence number of the target frame according to the first pointer sequence number of the target frame.
5. The LED display driving method according to claim 4, wherein when the total gray value of the target frame is greater than the gray threshold value, the step of assigning the fractional gray to a preset subframe and the step of assigning the integer gray to the remaining subframes comprises:
dividing the total gray value of the target frame by the non-break threshold to obtain a second quotient and a second remainder, and dividing the second quotient by the number of subframes to obtain a third quotient and a third remainder;
judging whether the second remainder is equal to 0;
when the second remainder is not equal to 0, determining the display gray level of the current subframe according to the relation between the second pointer sequence number and the preset subframe and the relation between the second pointer sequence number and the third remainder;
and when the second remainder is equal to 0, determining the display gray level of the current subframe according to the relation between the second pointer number and the third remainder.
6. The LED display driving method according to claim 5, wherein when the second remainder is not equal to 0, the step of determining the display gray level of the current subframe according to the relationship between the second pointer number and the preset subframe and the relationship between the second pointer number and the third remainder comprises:
judging whether the second pointer sequence number corresponds to the preset subframe or not;
and when the second pointer sequence number corresponds to the preset subframe, adding a second remainder to the product of a third quotient and the non-break threshold value to be used as the display gray level of the current subframe.
7. The LED display driving method according to claim 6, further comprising:
when the second pointer sequence number does not correspond to the preset subframe, judging whether a third remainder is larger than or equal to the second pointer sequence number;
when the third remainder is greater than or equal to the second pointer sequence number, taking the product of the third quotient added with 1 and the non-break threshold value as the display gray level of the current subframe;
and when the third remainder is not more than the second pointer sequence number, taking the product of the third quotient and the non-scattering threshold value as the display gray level of the current subframe.
8. The LED display driving method according to claim 5, wherein when the second remainder is equal to 0, the step of determining the display gray level of the current sub-frame according to the relationship between the second pointer number and the third remainder comprises:
Judging whether the third remainder is larger than a second pointer sequence number;
when the third remainder is larger than the second pointer sequence number, taking the product of the third quotient added with 1 and the non-break threshold value as the display gray level of the current subframe;
and when the third remainder is not greater than the second pointer sequence number, taking the product of the third quotient and the non-break threshold as the display gray level of the current subframe.
9. The LED display driving method according to claim 5, further comprising:
and when the total gray value of the target frame is not greater than the gray threshold value, determining the gray value of each subframe of the target frame based on the total gray value of the target frame, the non-scattering threshold value and the second pointer sequence number.
10. The LED display driving method according to claim 9, wherein the step of determining the gray value of each sub-frame of the target frame based on the total gray value of the target frame, the non-break-up threshold value, and the second pointer number comprises:
dividing the total gray value of the target frame by the non-break threshold to obtain a first quotient and a first remainder;
and determining the display gray level of the current subframe according to the relation between the first quotient and the second pointer sequence number.
11. The LED display driving method according to claim 10, wherein the step of determining the display gray level of the current sub-frame according to the relationship between the first quotient and the second pointer number comprises:
Judging whether the first quotient is larger than the second pointer sequence number;
when the first quotient is larger than the second pointer sequence number, the non-break threshold value is used as the display gray level of the current subframe;
when the first quotient is not greater than the second pointer sequence number, judging whether the first quotient is equal to the second pointer sequence number;
when the first quotient is equal to the second pointer number, taking the first remainder as the display gray level of the current subframe;
when the first quotient is not equal to the second pointer number, zero is taken as the display gray of the current subframe.
12. The LED display driving method according to any one of claims 1 to 11, characterized by further comprising, after determining the display gradation of the current sub-frame:
and adding 1 to the first pointer sequence number, and obtaining a second pointer sequence number according to the first pointer sequence number after adding 1.
13. The LED display driving method according to claim 12, further comprising:
judging whether the number of the second pointer is larger than or equal to the number of subframes;
when the number of the second pointer is larger than or equal to the number of subframes, executing the steps of acquiring the total gray value of the target frame and the following steps;
when the number of the second pointer is not more than the number of subframes, a step of judging whether the total gray value of the target frame is more than a gray threshold value and the following steps are executed.
14. The LED display driving method according to claim 2, wherein the non-break threshold is a natural number greater than 1 when the low ash is turned on and is not broken, and is 1 when the low ash is not turned on.
15. The LED display driving method according to claim 5, wherein the step of obtaining a second pointer number from the first pointer number comprises:
acquiring a first pointer sequence number corresponding to a subframe sequence number;
converting the first pointer sequence number from a decimal value to a binary value;
performing high-low turning operation on the binary number value corresponding to the first pointer sequence number to obtain a binary number value corresponding to the second pointer sequence number;
and converting the binary value corresponding to the second pointer sequence number into a decimal value.
16. The LED display driving method according to claim 15, further comprising, after the step of converting the binary value corresponding to the second pointer number into a decimal value:
judging whether the decimal value corresponding to the converted second pointer sequence number is smaller than the number of subframes or not;
if the decimal value corresponding to the converted second pointer sequence number is smaller than the number of subframes, the decimal value corresponding to the converted second pointer sequence number is the second pointer sequence number;
If the decimal value corresponding to the converted second pointer number is not less than the number of subframes, repeating the steps in claim 15 after the first pointer number corresponding to the subframe number is incremented.
17. An LED display driving chip for performing the LED display driving method according to any one of claims 1 to 16.
18. A display panel connected to the drive output of the LED display driver chip of claim 17.
19. An LED display driving device comprising a display panel and an LED display driving chip for performing the LED display driving method according to any one of claims 1 to 16.
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