CN116168641A

CN116168641A - LED display screen driving method and device, computer equipment and storage medium

Info

Publication number: CN116168641A
Application number: CN202211702741.5A
Authority: CN
Inventors: 王朝; 朱卫强; 申中华
Original assignee: Shenzhen Zhouming Technology Co Ltd
Current assignee: Shenzhen Zhouming Technology Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-26

Abstract

The application relates to an LED display screen driving method, an LED display screen driving device, a display screen and a storage medium. According to the method, a display data stream is obtained, the display data stream comprises gray data of each frame, the gray data comprises normal gray weights and low gray weights which are sequentially sequenced in a refreshing sequence, the low gray weights are gray scales exceeding the minimum brightness requirement of screen lighting, an LED display screen is driven to refresh according to the refreshing sequence of the gray weights, the refreshing sequence of the low gray weights is obtained according to a first driving mode corresponding to the normal gray weights, a pixel unit is determined according to the refreshing sequence, each lamp bead in the pixel unit belongs to different categories, the lamp beads in the different categories in the pixel unit of a target display area of a corresponding frame are driven to sequentially light, and the number of the lamp beads in the pixel unit is doubled along with the increase of the refreshing sequence of the low gray weights. The method enables the LED display screen to have lower gray scale capability, and solves the problem that the lower gray scale limit is limited.

Description

LED display screen driving method and device, computer equipment and storage medium

Technical Field

The present application relates to the technical field of LED (Light Emitting Diode) display screens, and in particular, to a method, an apparatus, a computer device, a storage medium and a computer program product for driving an LED display screen.

Background

The LED display screen is a new type of information display medium, which is a flat display screen composed of Light Emitting Diode (LED) lattice modules or pixel units. The gray scale capability is a level which can be realized by describing the screen from the brightest to the darkest, and the more the levels are, the better the gray scale performance is, and the stronger the low gray scale capability is. When the picture content is displayed, the screen with strong gray scale capability can display a picture with more layers and more image details. Based on this, in order to make the LED display screen realize richer gray, the brightness of the lamp beads needs to be continuously reduced, and the lower the brightness of the lamp beads is, the higher the gray capability of the screen is, so the display screen system always pursues lower gray, that is, the lowest brightness value that can be realized by the screen.

Currently, when an LED display screen works, the screen has a certain lower gray level limit, and the lower gray level limit that can be achieved by the screen is limited by the working frequency and the electrical characteristics of a driving circuit. Therefore, the existing LED display screen has the problem of limited gray scale lower limit.

Disclosure of Invention

Based on this, it is necessary to provide an LED display driving method, apparatus, computer device and computer readable storage medium in view of the above technical problems.

In a first aspect, the present application provides a method for driving an LED display screen. The method comprises the following steps:

acquiring a display data stream, wherein the display data stream comprises gray data of each frame; the gray data comprises normal gray weight values and low gray weight values which are orderly sequenced in a refreshing sequence; the low gray scale weight is the gray scale which is limited by the first driving mode and exceeds the minimum brightness requirement of the screen lighting;

driving the LED display screen to refresh according to a first driving mode corresponding to the normal gray weight according to the refreshing sequence of the gray weight;

acquiring a refreshing sequence of the low gray scale weight, and determining a pixel unit according to the refreshing sequence, wherein each lamp bead in the pixel unit belongs to different categories;

driving different types of lamp beads in pixel units of a target display area of a corresponding frame of the current refreshing sequence to be sequentially lighted; wherein, as the refreshing sequence of the low gray scale weight increases, the number of the lamp beads in the pixel unit doubles.

In one embodiment, when the low gray scale weight is the first low gray scale weight arranged after the last normal gray scale weight, the determining the pixel unit according to the refresh order includes:

And determining two lamp beads as a pixel unit according to the refreshing sequence of the first low gray scale weight.

In one embodiment, when there is no overlap between the target display area of the frame corresponding to the next refresh and the target display area of the frame corresponding to the next refresh, the driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order sequentially lights up, including:

and driving different types of lamp beads in the pixel units of the target display area of the frame corresponding to the current refreshing sequence and the frame corresponding to the next refreshing sequence to be sequentially lighted.

In one embodiment, when there is no overlap between the target display area of the frame corresponding to the current refresh and the target display area of the frame corresponding to the previous refresh and the target display area of the frame corresponding to the next refresh, the driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order sequentially lights up, including:

and the lamp beads of different categories in the pixel units of the target display area of the frame corresponding to the refreshing sequence before driving, the frame corresponding to the refreshing sequence last and the frame corresponding to the refreshing sequence next are sequentially lightened.

In one embodiment, when there is no overlap between the target display area of the frame corresponding to the current refresh and the frame corresponding to the previous refresh, the driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order sequentially lights up, including:

And the lamp beads of different categories in the pixel units of the target display area of the frame corresponding to the refreshing sequence before driving and the frame corresponding to the last refreshing sequence are sequentially lightened.

In one embodiment, the normal gray weights include a first normal gray weight and a second normal gray weight ordered after the first normal gray weight;

according to the refreshing sequence of the gray weights, driving the LED display screen to refresh according to a first driving mode corresponding to the normal gray weights, including:

driving the LED display screen to refresh according to the refresh times of the first normal gray scale weight;

and driving the LED display screen to refresh according to the lamp bead lighting time corresponding to the second normal gray scale weight.

In a second aspect, the present application further provides a display screen adjusting device. The device comprises:

the data stream acquisition module is used for acquiring a display data stream, wherein the display data stream comprises gray data of each frame; the gray data comprises normal gray weight values and low gray weight values which are orderly sequenced in a refreshing sequence; the low gray scale weight is the gray scale which is limited by the first driving mode and exceeds the minimum brightness requirement of the screen lighting;

the normal gray control module is used for driving the LED display screen to refresh according to a first driving mode corresponding to the normal gray weight according to the refreshing sequence of the gray weight;

The pixel unit determining module is used for acquiring the refreshing sequence of the low gray scale weight, determining a pixel unit according to the refreshing sequence, wherein each lamp bead in the pixel unit belongs to different categories;

the low gray level control module is used for driving different types of lamp beads in the pixel units of the target display area of the corresponding frame of the current refreshing sequence to be sequentially lightened; wherein, as the refreshing sequence of the low gray scale weight increases, the number of the lamp beads in the pixel unit doubles.

In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:

In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:

In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:

According to the LED display screen driving method, the device, the computer equipment and the storage medium, the display data stream is obtained, the display data stream comprises gray data of each frame, the LED display screen is driven to refresh by adopting a first driving mode for normal gray weights, the low gray weights are gray which is limited by the first driving mode and exceeds the minimum brightness requirement of screen lighting, the refreshing order of the low gray weights is obtained for the low gray weights, the pixel units are determined according to the refreshing order, each lamp bead in the pixel units belongs to different categories, the lamp beads in the different categories in the pixel units of the target display area of the corresponding frame of the current refreshing order are driven to sequentially light, and the number of the lamp beads in the pixel units is doubled along with the increase of the refreshing order of the low gray weights. The method enables the low gray scale which is limited by the first driving mode and exceeds the minimum brightness requirement of screen lighting to be higher than the last low gray scale weight refreshing, the number of the lamp beads in the pixel unit is doubled, the types of the lamp beads in the pixel unit are doubled, and each refreshing is sequentially lighting the lamp beads of different types in the pixel unit, so that the number of the lamp beads which are lighted each time is halved compared with the last low gray scale weight refreshing, the total brightness is reduced to half of the original one, lower gray scale is realized, the LED display screen has lower gray scale capability, and the problem of limited gray scale lower limit is solved.

Drawings

FIG. 1 is an application environment diagram of a method of driving an LED display screen in one embodiment;

FIG. 2 is a flow chart of a method for driving an LED display screen according to one embodiment;

FIG. 3 is a schematic diagram of data classification in one embodiment;

FIG. 4 is a schematic diagram showing the arrangement of the lamp beads according to one embodiment;

FIG. 5 is a schematic diagram of refreshing a display area on a display screen in one embodiment;

FIG. 6 is a schematic diagram of a bead arrangement and grouping relationship in another embodiment;

FIG. 7 is a schematic illustration of the movement of an object in one embodiment;

FIG. 8 is a schematic diagram of dynamic refresh in one embodiment;

FIG. 9 is a schematic diagram of a motion compensation strategy in one embodiment;

FIG. 10 is a schematic diagram of a refresh policy in one embodiment;

FIG. 11 is a block diagram of an LED display screen driving apparatus in one embodiment;

fig. 12 is an internal structural diagram of a computer device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The gray scale capability is a level which can be realized by describing the screen from the brightest to the darkest, and the more the levels are, the better the gray scale performance is, and the stronger the low gray scale capability is. When the picture content is displayed, the screen with strong gray scale capability can display a picture with more layers and more image details. Display screen systems have sought lower gray levels, the lowest brightness value that can be achieved for a screen.

For LED displays, it is possible to display content by dynamic refresh. That is, in one frame of picture, different brightness is displayed by turning on and off the lamp beads for a plurality of times, and further different contents are displayed. The gray data is used for controlling the refreshing times of the lamp beads. Based on this, in order to make the LED display screen realize richer gray scale, the brightness of the lamp beads needs to be continuously reduced, and the lower the brightness of the lamp beads is, the higher the gray scale capability of the screen is.

Dynamic refresh is a PWM (Pulse Width Modulation ) drive, which is a common drive technique available for LEDs. Based on the PWM-driven beads, the duration of the bead lighting is the same every time the bead lighting is refreshed. For a bead, the number of flashes in a frame time is limited, for example, 16.67ms in a frame, and if the duration of one turn of the bead is 0.22ms, the bead can be turned on 73 times at most in 16.67 ms.

Based on this, the corresponding gradation data is at least 16 bits, i.e., as shown in table 1 below, to light the lamp bead 73 times.

Table 1 Single frame refreshing order and Gray weight

Table 1 shows the lowest gray level that the lamp beads can refresh in one frame time based on the existing driving architecture, and the corresponding gray level data format.

Specifically, what is known as a screen having a 16-bit gray scale capability is that a gray scale weight describing the sequence of bead refresh can be 16 bits in a frame of time. Here, 16 bits are gray weight bits in table 1.

In the 16-bit gray scale data, different bit numbers represent different weights, and the corresponding lamp bead refreshing sequences are also different. The corresponding order can be seen from table 1.

When the gray data of the highest bit, i.e. the first bit, is 1, the corresponding lamp beads need to be refreshed 32 times. When the second bit gray level data is 1, the corresponding lamp beads need to be refreshed 16 times, and so on, when the sixth bit is the second bit, the corresponding lamp beads need to be refreshed only 1 time, and the later 10 bits of numbers are that the refreshing times of the lamp beads can not be reduced any more, but the lighting time can be covered by means of enabling signals and the like, so that the lamp beads can be continuously lighted for a period of 1 time according to the rule of halving.

It should be further described that, in order to improve the gray scale capability of the screen, the beads are expressed with different brightness as much as possible, when the number of refreshing times of the beads is reduced to 1, it means that the brightness distinction can not be achieved by controlling the number of times of lighting the beads, at this time, an enabling signal is added on the basis that the original beads are lighted once, the enabling signal can further control the lighting time of the beads, and when the beads are lighted once, the lighting time of the beads is reduced by half continuously, thereby achieving the purpose of adjusting the brightness.

When the gray scale weight of the lamp bead is 16 th bit, the corresponding lamp bead refreshing is that the lamp bead is only lighted for 1/1024 time lengths, namely 0.22x 1/1024 seconds, in the time period of lighting the lamp bead for 1 time, which is the lowest brightness which can be achieved by the lamp bead, namely the lowest gray scale which can be achieved by the screen.

At this time, if the brightness of the lamp beads is to be further reduced, the time for the lamp beads to be lighted is insufficient for the column driving device and the constant current device to react. Based on this, it is possible to achieve higher gray scale performance only by improving the circuit, optimizing the column driving device and constant current device performance, and increasing their operating frequency. However, the screen has a defined upper gray level limit, which is limited by the operating frequency and electrical characteristics of the driving circuit, and the minimum brightness that can be achieved by the beads.

In order to further improve the screen gray scale, the application provides an LED display screen driving method which can be applied to computer equipment with a display screen, such as the display screen shown in fig. 1. The method comprises the steps that a computer device obtains a display data stream, the display data stream comprises gray data of each frame, the gray data comprises normal gray weights and low gray weights which are sequentially ordered in a refreshing sequence, the low gray weights are gray scales which are limited by a first driving mode and exceed the minimum brightness requirement of screen lighting, an LED display screen is driven to refresh according to the refreshing sequence of gray weight bits, the refreshing sequence of the low gray weights is obtained for the first driving mode corresponding to the normal gray weights, a pixel unit is determined according to the refreshing sequence, each lamp bead in the pixel unit belongs to different categories, the lamp beads in the different categories in the pixel unit of a target display area of a corresponding frame are driven to be sequentially lighted, and the number of the lamp beads in the pixel unit is doubled along with the increase of the refreshing sequence of the low gray weights. The computer equipment comprises, but is not limited to, a personal computer, a notebook computer, a tablet personal computer, an Internet of things device and portable wearable equipment, wherein the Internet of things device can be an intelligent sound box, an intelligent television, an intelligent vehicle-mounted device and the like. The portable wearable device may be a smart watch, smart bracelet, headset, or the like.

In one embodiment, as shown in fig. 2, there is provided an LED display screen driving method applied to a computer device having a display screen, comprising the steps of:

step 202, obtaining a display data stream, wherein the display data stream comprises gray data of each frame; the gray data comprises normal gray weights and low gray weights which are orderly sequenced in a refreshing sequence; the low gray scale weight is the gray scale limited by the first driving mode beyond the minimum brightness requirement for the screen to light up.

Taking 16-bit gray data as an example, the screen can reach 16-bit gray capability, that is, the gray weight describing the refreshing sequence of the lamp beads can reach 16 bits in one frame time. Here, the 16 bits are gray weight bits in table 1, and each gray weight bit corresponds to one or more frames. In the 16-bit gray scale data, different bit numbers represent different weights, and the corresponding lamp bead refreshing sequences are also different. Thus, the gray weights are related to a single frame refresh order, the corresponding order of which can be seen from table 1, the refresh order being ordered from low to high gray weight order.

The display data stream sent by the system is composed of one frame of gray data. After receiving a frame of gray data, the screen system converts the gray data into a refreshing data stream for refreshing the lamp beads. In one embodiment, as shown in fig. 3, the gray data corresponding to one frame time is divided into a normal gray weight and a low gray weight. The normal gray weight is normal gray data which can be carried by a screen in a first driving mode, and the first driving mode controls the refreshing times of the lamp beads and the normal gray corresponding to the normal gray weight which can be realized by the enabling signals. The low gray scale weight is the gray scale under the minimum brightness requirement of the screen lighting in the first driving mode, namely the gray scale part limited by the first driving mode and incapable of being displayed by the screen.

And 204, driving the LED display screen to refresh according to a first driving mode corresponding to the normal gray weight according to the refreshing sequence of the gray weight.

The normal gray weight is normal gray data carried by the screen, and here refers to gray that can be achieved by controlling the refresh times of the lamp beads and the enable signals. For normal gray data, driving is performed by controlling the number of lighting times and lighting time of the lamp beads through the PWN. The idea is that the lamp beads are lighted up for several times in one frame and divided into a plurality of subframes. For the lamp beads, the brightness is uniform as long as the lighting time is one subframe. The brightness of the lamp beads can be reduced by lighting one subframe.

Specifically, based on the PWM-driven beads, taking one frame of 16.67ms as an example, if the duration of one time of the bead lighting is 0.22ms, the bead can be lighted 73 times at most in a time of 16.67 ms. Then, to light the beads 73 times, the corresponding gray data needs at least 16 bits, specifically, the screen can reach a gray scale capability of 16 bits, which means that the gray scale weight describing the refreshing sequence of the beads can reach 16 bits in one frame time. Among the 16-bit gradation weights, display control is performed in the order of the first-bit gradation weight to the sixteenth-bit gradation weight. The first to sixth grey scale weights realize different brightness by controlling the refreshing times of the lamp beads, but the seventh to sixteenth grey scale weights realize different brightness by controlling the lighting time of the lamp beads. The refreshing times of the lamp beads corresponding to the seventh gray scale weight are not reduced, and the lighting time of the lamp beads can be further controlled through the enabling signals, so that the lighting time of the lamp beads is reduced by half continuously when the lamp beads are lighted once, and the purpose of adjusting the brightness is achieved. The working logic of the enabling signal is to cut one PWM signal for driving the lamp beads to be lighted, and one part of PWM signal is invalid, namely the lamp beads are not lighted, so that the lighting time of the lamp beads is controlled.

Step 206, obtaining the refreshing sequence of the low gray scale weight, and determining the pixel unit according to the refreshing sequence, wherein each lamp bead in the pixel unit belongs to different categories.

According to the first driving mode, when the lighting time of the lamp beads is further reduced to be expected to achieve lower luminance, an excessively short time is insufficient for the column driving device and the constant current device to react. Based on this, it is possible to achieve higher gray scale performance only by improving the circuit, optimizing the column driving device and the constant current device performance, and increasing the operating frequency thereof. The screen has a defined upper gray level limit that is limited by the operating frequency and electrical characteristics of the driving circuit to the minimum brightness that can be achieved by the beads.

In order to achieve lower gray scale, the method is space gray scale, and lower brightness can be achieved by controlling the number, position and lighting sequence of the lighting beads, so that the low gray scale weight can be increased. Taking the normal gray scale weight as 1-16 bit times as an example, the gray scale weight exceeding 16 times is the low gray scale weight.

That is, for the 1 st to 16 th gray scale, the beads of the LED display screen may be refreshed in the first driving manner. And acquiring the refreshing sequence according to the gray scale weight of the 17 th bit and the following gray scale weights. In the time of one frame, each bit weight has a corresponding sequence and refreshing times according to the gray weight.

In one embodiment, the refresh order corresponding to the low gray scale weights is shown in Table 2

TABLE 2 Gray weights and corresponding refresh orders

As can be seen from table 2, the weight bits of the gray weights are related to the refresh order. Wherein bits 1 to 16 are normal gray scale weights, and bits 17 to 20 are low gray scale weights. The refreshing sequence corresponding to the 17 th low gray scale weight is 17, the refreshing sequence corresponding to the 18 th low gray scale weight is 18, the refreshing sequence corresponding to the 19 th low gray scale weight is 19, and the refreshing sequence corresponding to the 20 th low gray scale weight is 20.

For low gray scale weight, the application adopts a scheme of refreshing space gray scale, and the basic idea is to realize lower brightness expression by controlling the number, the position and the lighting sequence of the lighting lamp beads. For example, four areas of the screen are lit in time-sharing fashion for 4 consecutive frames, which constitute a complete screen picture. The brightness is reduced to 1/4 of the original brightness compared to when the 4 areas are all lit simultaneously for 4 consecutive frames. For each bead, the brightness is consistent when the beads are lighted, but in the lighting process, the number of the lighted beads is different, the former only lights 1/4 of the beads of the whole screen each time, and the latter lights the beads of the whole screen each time, so that the gray scale of the screen is greatly improved under the condition that the brightness of the beads is unchanged.

Specifically, fig. 4 is a schematic diagram of realizing lower gray level of 4 beads in 4 consecutive frames under the existing PWM driving architecture. The lamp beads are numbered 1, 2, 3 and 4 respectively, and the numbers corresponding to the same lamp bead are the same in four frame time.

In the four frames, each frame has at least one subframe, the lamp beads are lighted, and the lamp beads are not lighted at the rest moments. In this one subframe to be lit, the

beads

1, 2, 3, and 4 are all lit, and each bead is lit 4 times over a period of 4 frames, and 4 beads are lit 16 times in total. If the brightness of each lamp bead is recorded as 1 brightness, the brightness of the lamp bead is increased by 1 brightness after each lamp bead is lighted 1 time, so that the total brightness of the lamp beads is 16 brightness in four frames of time.

Also, in the four frames, only 1 bead is lit in the sub-frame to be lit in each frame, only bead 1 is lit in the first frame, only bead 2 is lit in the second frame, only bead 3 is lit in the third frame, and only bead 4 is lit in the fourth frame. The total brightness of the 4 beads is 4 times in the four frame time, and the total brightness of the beads is 4 brightness in the four frame time. Therefore, compared with the original 16 brightness, the current brightness is reduced to 1/4 of the original brightness, namely, the lamp beads display different gray scales under the same pulse width and duty ratio by changing the lighting quantity and the refreshing strategy of the lamp beads. Because the lamp beads which are lighted each time are different, 4 lamps which are lighted four times can form a complete part, for each lighting, the resolution of the screen is reduced to 1/4 of the original resolution, but in the time of 4 frames, the lamp beads form a complete picture together, and the gray level expressive force of the screen can be further improved under the condition that the display quality of the lamp beads is not influenced by the smear effect of people as long as the time is refreshed fast enough. That is, the spatial gray scale refresh strategy reduces the overall brightness to 1/4 of the original without affecting the screen resolution.

Based on the thought, on the basis of the existing PWM driving, the effect of improving the gray scale expression of the screen by utilizing the space gray scale can be utilized.

Specifically, as shown in table 3, in a period of one frame, the gray scale capability of the corresponding screen is 16-bit gray scale under the refreshing 73 of the lamp beads. When the transmitted display data stream is required to reach the 17 th gray level, namely the normal gray level weight is 16 bits, and the low gray level weight is 1 bit, the low gray level weight can be realized by changing the number of the light beads lighted when the 16 th gray level is reached. Therefore, 1 refresh is added in one frame time on the basis of 73 original refreshes, namely 74 refreshes of the lamp beads in one frame time. At 74 th refresh, 17 th bit gray scale data is refreshed. And by analogy, when the display data flow is required to reach the 18 th bit gray level, namely the normal gray level weight is 16 bits, and the low gray level weight is 2 bits, 1 refresh is added on the basis of the original 74 refreshes in one frame time, namely 75 refreshes of the lamp beads in one frame time. At the 75 th refresh, 18 th bit gray scale data is refreshed. The light beads are refreshed once more in one frame time every one more bit of low gray scale weight, and the refreshing time is for realizing the current gray scale refreshing.

It should be noted that the length of time that the beads are lit once can be defined, i.e. the value of t is not absolute. Therefore, the different refreshing times of the lamp beads in one frame can be realized by adjusting the time length t of the lamp beads which are lighted once. Next, the 17-bit gray scale is a one-bit gray scale requirement compared to the 16-bit gray scale, and this is merely an example for convenience of description of the scheme. In practical applications, from the data transmission and distribution, 18 bits, 20 bits and 24 bits are usually the most. Finally, the above discussion is implemented within a frame of time, and the lower gray level is refreshed within a frame of time by controlling the lamp beads to be lighted to reduce the number of the lamp beads by half with the lowest brightness, so that the aim of reducing the whole brightness by half on the basis of the lowest brightness is achieved. This results in low gray content to be displayed, which is reduced in resolution by half. For example, in a 17-bit gray scale refresh, a square is displayed, and the number of pixels of the square is reduced by half compared with a 16-bit gray scale. If the time length is prolonged to two frames, the picture content to be displayed by the 17-bit gray scale is unchanged relative to the previous frame, and the other half of the lamp beads can be lighted.

TABLE 3 refresh order and frame number Compensation relationship

Gray scale weight bit	16	17	18	19	20
						Number of intra-frame refreshes	73	74	75	76	77
Continuous refresh time	1 frame	2 frames	4 frames	8 frames	16 frames

Fig. 4 corresponds to 75 refreshes of the lamp beads in a frame time, the first 73 refreshes correspond to normal gray scale weights, and the 75 th refreshes are 18 th gray scale data. The low gray capability of the 18 th gray level is reduced to 1/4 of the 16 th gray level, namely, for the 18 th gray level, the brightness requirement is reduced by half again on the basis of the 17 th gray level, and the number of the lamp beads required to be lighted is reduced to 1/4. That is, one pixel unit is composed of four lamp beads, and the four lamp beads of one pixel unit belong to different categories. Then, for one pixel unit composed of four beads, the four beads are classified into different categories, and since only one category of beads is lit at a time, 4 frames need to be continuously refreshed for one pixel unit composed of four beads. I.e. the 75 th refresh needs to be divided into 4 frames, and the 4 kinds of lamp beads are respectively lighted in the 4 frames.

In this embodiment, the composition of the pixel unit corresponding to the refreshing sequence of the low gray scale weight is determined by the low gray scale weight, and each lamp bead in the pixel unit belongs to different categories, so that the lamp beads in different categories can be controlled to be displayed in turn, and the low gray scale is realized.

Step 208, driving different types of lamp beads in the pixel units of the target display area of the corresponding frame of the current refreshing sequence to be sequentially lightened; the number of the lamp beads in the pixel unit is doubled along with the increase of the refreshing sequence of the low gray scale weight.

And sequentially lighting the different types of lamp beads in the pixel units of the target display area of the corresponding frame when refreshing, and according to the classification of the lamp beads, lighting the lamp beads of the same type according to the classification, so as to obtain lower brightness and realize lower gray scale.

Taking the first gray level low gray level refresh as an example, namely, the 17 th gray level, as shown in fig. 5, the whole screen beads are divided into A, B, and when the screen refreshes the low gray level, if a 5x5 square is to be displayed, the beads are to be lighted in a 5x5 area. The 5x5 area does not light up all the beads in one frame, but in two consecutive frames, the first frame lights up the a beads first and the second frame lights up the B beads again, i.e. the low-ash content to be refreshed is divided and refreshed separately.

Specifically, when refreshing the 17 th bit gray scale, the first frame lights up the light bead a first and the second frame lights up the light bead B second. The low-ash data to be refreshed is split into two parts, one type of lamp beads are lighted in one frame, the other type of lamp beads are lighted in the next frame, and from the single frame time, only half of pixel contents are displayed, but from the continuous two frame time, the split contents are refreshed in sequence, and all the pixel contents are completely displayed.

It should be noted that, because of the uncertainty of the display content, the number of the lamp beads A, B covered is not exactly the same in the time of two consecutive frames, and it is possible that a is much covered and B is much covered, but the information of the picture is mostly preserved in the time range of two consecutive frames. For the display system for controlling refreshing, A, B lamp beads are refreshed according to the lamp bead labels in sequence only according to the low-gray display content.

The lamp beads are arranged in groups at the low-ash part according to the low-ash content to be displayed. As shown in fig. 6, for the 18 th gray scale, four kinds of light beads A, B, C, D are respectively lighted in 4 continuous frame time to form the content to be displayed. Similarly, for the 19 th gray scale, in order not to reduce the pixel quality, the A, B, C, D, E, F, G and H eight types of lamp beads are respectively lighted in 8 continuous frame time to form the content to be displayed. For the 20 th gray scale, in order not to reduce the pixel quality, sixteen types of lamp beads from A to I are respectively lightened in the continuous 16 frame time to form the content to be displayed. I.e. the number of lamp beads in the pixel cell doubles as the low gray scale weight refresh order increases.

The driving method of the LED display screen of this embodiment is a scheme that uses spatial gray scale, and realizes lower brightness performance by controlling the number, position and lighting sequence of the lighting lamp beads. The basic idea is that different brightness expressions are realized by controlling the number of the lighted lamp beads on the screen, and on the basis, different areas can be lighted in a time-sharing way without influencing the display quality, so that a complete picture is finally formed. For example, four areas of the screen are time-division lit up for a period of 4 consecutive frames, which four areas constitute a complete screen picture. The brightness is reduced to 1/4 of the original brightness compared to when the 4 areas are all lit simultaneously for 4 consecutive frames. For each bead, the brightness is consistent when the beads are lighted, but in the lighting process, the number of the lighted beads is different, the former only lights 1/4 of the beads of the whole screen each time, and the latter lights the beads of the whole screen each time, so that the gray scale of the screen is greatly improved under the condition that the brightness of the beads is unchanged.

In this embodiment, a display data stream is obtained, where the display data stream includes gray data of each frame, for a normal gray weight, a first driving mode is used to drive an LED display screen to refresh, a low gray weight is a gray that is limited by the first driving mode and exceeds a minimum brightness requirement of screen lighting, for a low gray, a refresh order of the low gray weight is obtained, a pixel unit is determined according to the refresh order, each bead in the pixel unit belongs to different categories, and different categories of beads in a pixel unit in a target display area of a frame corresponding to a current refresh order are driven to sequentially light, where, as the refresh order of the low gray weight increases, the number of the beads in the pixel unit doubles. The method leads the low gray scale which is limited by the first driving mode and exceeds the minimum brightness requirement of the screen lighting to be higher than the last low gray scale weight refreshing, and the types of the lamp beads in the pixel units are doubled because the number of the pixel points in the pixel units is doubled, and each refreshing is that the lamp beads of different types in the pixel units are sequentially lighted, so that the number of the lamp beads lighted each time is halved compared with the last low gray scale weight refreshing, thereby the total brightness is reduced to half of the original one, lower gray scale is realized, the LED display screen has lower gray scale capacity, and the problem of limited gray scale lower limit is solved.

In another embodiment, when the low gray scale weight is the first low gray scale weight arranged after the last normal gray scale weight, determining the pixel cell according to the refresh order includes: and determining two lamp beads as a pixel unit according to the refreshing sequence of the first low gray scale weight.

The low gray scale weight is the first low gray scale weight arranged after the last normal gray scale weight, namely the 17 th gray scale weight, and the pixel unit is determined according to the refreshing times. The gray-scale level 17 has half the gray-scale level 16, i.e., the brightness requirement for gray-scale level 17 is halved, and the number of light beads required to be lighted is halved. According to the spatial refresh strategy, the number of lit beads is reduced to half, and two beads are required to be one pixel unit.

For the 18 th gray scale weight, the brightness requirement is reduced by half, and the number of the lamp beads required to be lighted is reduced by half. That is, one pixel unit is composed of 4 lamp beads, and the 4 lamp beads of one pixel unit belong to different categories. Specifically, as shown in fig. 7, 4 beads of one pixel unit are divided into four types A, B, C and D, and the four types of beads are arranged at equal intervals.

In this embodiment, two beads are determined as one pixel unit according to the number of refreshing times of the first low gray scale weight, so as to provide conditions for realizing lower brightness according to the spatial refreshing strategy.

In another embodiment, when there is no overlap between the target display area of the frame corresponding to the next refresh and the target display area of the frame corresponding to the next refresh, driving different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order to be sequentially turned on, including: and driving different types of lamp beads in the pixel units of the target display area of the frame corresponding to the current refreshing sequence and the frame corresponding to the next refreshing sequence to be sequentially lighted.

The lamp beads can be subdivided according to different gray weights by adopting a lamp bead classification refreshing strategy, and the refreshing strategy can completely display the content of one pixel unit in continuous frames when the static content is displayed. However, if an object moving at a high speed is to be displayed, there is a problem of missing pixels.

In particular, when a high-speed moving object that needs to display low ash is required, the following refresh strategy may be employed.

Taking the first low gray level refresh as an example, the whole screen is divided into a plurality of pixel units, and two lamp beads of each pixel unit are divided into A, B. In the case of a low gray scale, a moving object is required to be displayed, and assuming that the object is a square, there are two cases in display according to the moving speed of the object, as shown in fig. 7.

In the first case, there is an overlap between the target display area of the corresponding frame to be refreshed next time and the target display area of the corresponding frame to be refreshed next time.

In the second case, there is no overlap between the target display area of the corresponding frame to be refreshed next time and the target display area of the corresponding frame to be refreshed next time.

Based on the refresh logic described above, the first frame lights up the bead a and the second frame lights up the bead B, and the lighting up is as shown in fig. 8.

In the first case, when the target display area of the corresponding frame is refreshed again and overlapped with the target display area of the corresponding frame is refreshed again, the contents of all pixel units are displayed completely in two continuous frames, the basic image characteristics of the square motion are reserved, and a clear moving point can be seen from the image. That is, when the overlapping area of the new refresh content and the old content is large, only a smaller part of the content is refreshed at the first refresh, so that most of the pixels missing at the first refresh are filled at the second refresh. In the second case, when there is no overlap between the target display area of the corresponding frame to be refreshed next and the target display area of the corresponding frame to be refreshed next, the content to be refreshed next cannot be complemented as the content to be refreshed next, and therefore, the resolution of the screen is reduced to half of the original resolution in two consecutive frame times.

In order to solve the problem, a motion compensation method can be adopted to ensure the resolution of the screen, namely, the problem of the resolution reduction of the screen is solved by sequentially lighting different types of lamp beads in the pixel units of the target display area of the corresponding frame refreshed at the present time and the target display area of the corresponding frame refreshed at the next time.

Specifically, the strategy of motion compensation is shown in fig. 9, that is, the part to be refreshed in the previous frame is refreshed in advance in the previous frame. When there is no overlap between the target display area of the corresponding frame for the next refresh and the target display area of the corresponding frame for the next refresh, in order to ensure the resolution of the screen, the target display areas of the corresponding frame for the current refresh and the corresponding frame for the next refresh need to be refreshed when the refresh is performed. Taking the 17 th bit gray scale as an example, when refreshing, the class a lamp beads in the target area of the corresponding frame refreshed at the time and the target display area of the corresponding frame refreshed at the next time are lighted.

In this embodiment, for an object moving at a high speed, there is a problem of missing pixels, and the integrity of the displayed screen information is ensured in two consecutive frames by refreshing the portion to be refreshed in the next frame in advance in the previous frame.

In one embodiment, when there is no overlap between the target display area of the frame corresponding to the current refresh and the target display area of the frame corresponding to the previous refresh and the target display area of the frame corresponding to the next refresh, driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order to be sequentially turned on, including: and the lamp beads of different categories in the pixel units of the target display area of the frame corresponding to the refreshing sequence before driving, the frame corresponding to the refreshing sequence before driving and the frame corresponding to the refreshing sequence after driving.

Specifically, taking the 18 th bit gray scale as an example, when the target display area of the corresponding frame is refreshed last time and the target display area of the corresponding frame is refreshed next time, since the target area of the corresponding frame is refreshed next time and the target display area of the corresponding frame is refreshed next time, when the corresponding frame is refreshed next time, not only the target display area of the corresponding frame is refreshed next time, but also the target display area of the corresponding frame is refreshed next time in advance. And for the situation that the target display area of the corresponding frame is not overlapped with the target display area of the corresponding frame to be refreshed last time, the target display area of the corresponding frame to be refreshed last time is refreshed in a supplementary mode when the refreshing is carried out last time in order to ensure the resolution of the content of the previous frame.

In this embodiment, aiming at the problem of pixel loss of the object moving at high speed, the frame information integrity of the target display area of the corresponding frame refreshed last time and the target display area of the corresponding frame refreshed next time is ensured by refreshing the target display area of the corresponding frame refreshed last time and the target display area of the corresponding frame refreshed next time.

In one embodiment, when there is no overlap between the target display area of the frame corresponding to the current refresh and the frame corresponding to the previous refresh, driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order to be sequentially turned on includes: and the lamp beads of different categories in the pixel units of the target display area of the frame corresponding to the refreshing sequence before driving, the frame corresponding to the refreshing sequence before driving and the frame corresponding to the refreshing sequence after driving.

Specifically, taking the 18 th bit gray scale as an example, when the target display area of the corresponding frame is refreshed last time and the corresponding frame is refreshed last time, in order to ensure that the picture information of the target display area of the corresponding frame is refreshed last time to be complete, the content of the target display area of the corresponding frame is refreshed last time is refreshed in a complementary mode when the corresponding frame is refreshed last time, so that the resolution of the target display area of the corresponding frame is not changed last time.

In this embodiment, for the object moving at a high speed, there is a problem of pixel loss, and the integrity of the screen information of the target display area of the corresponding frame refreshed last time is ensured by refreshing the target display area of the corresponding frame refreshed last time.

In one embodiment, the normal gray weights include a first normal gray weight and a second normal gray weight ordered after the first normal gray weight; according to the refreshing sequence of the gray weights, driving the LED display screen to refresh according to a first driving mode corresponding to the normal gray weights, comprising: driving the LED display screen to refresh according to the refresh times of the first normal gray scale weight; and driving the LED display screen to refresh according to the lighting time of the lamp bead corresponding to the second normal gray scale weight.

Taking a PWM-driven lamp as an example, if the duration of one-time lighting of the lamp is 0.22ms for a frame time of 16.67ms, the lamp can be lighted 73 times at most (typical value) within the time of 16.67 ms. Based on this, the corresponding gradation data is at least 16 bits for lighting the lamp beads 73 times, as shown in table 1.

Table 1 shows the lowest gray level that the lamp beads can refresh in one frame time based on the prior driving architecture, and the corresponding gray level data format. As shown in table 1, when the gray scale weight of the highest bit, i.e. the first bit, is 1, the corresponding lamp beads need to be refreshed 32 times. When the gray scale weight of the second bit is 1, the corresponding lamp beads need to be refreshed 16 times, and so on, and when the gray scale weight of the sixth bit is 1, the corresponding lamp beads need to be refreshed only 1 time, namely the first gray scale weight to the gray scale weight of the sixth bit realize different brightness by controlling the refreshing times of the lamp beads. The first normal gray scale weight is from the first gray scale weight to the sixth gray scale weight.

The refresh times of the corresponding lamp beads are not reduced any more from the seventh bit of gray data to the sixteenth bit of gray data. Meaning that the brightness distinction can no longer be achieved by controlling the number of refreshes of the beads. In order to improve the gray scale capability of the screen, when the refresh frequency of the lamp beads is reduced to 1, an enabling signal is added on the basis that the original lamp beads are lighted once, and the brightness adjustment is realized by controlling the lighting time of the lamp beads through the enabling signal. I.e., the second normal gray scale weight is the seventh bit gray scale weight to the sixteenth bit gray scale weight. As shown in Table 1, the gray scale weight of the lamp beads was 7 th bit, and the lighting time of the lamp beads was 1/2 of the time length, and at this time, the brightness of the lamp beads was changed to 1/2 of the original brightness. Similarly, the gray scale weight of the lamp bead is 16 th bit, and the corresponding lamp bead refreshing is that the lamp bead is only lighted for 1/1024 time lengths, namely 0.22x 1/1024ms, in the time period of lighting the lamp bead for 1 time, which is the lowest brightness which can be achieved by the lamp bead, namely the lowest gray scale which can be achieved by the screen.

In this embodiment, the first normal gray weight achieves different brightness by controlling the refresh times of the lamp beads, and the second normal gray weight achieves different brightness by controlling the lighting time of the lamp beads, so as to improve the lowest gray that can be achieved by the screen.

In one embodiment, when the screen is to display a frame of pictures, the lamp beads need to be lit up and refreshed 75 times in the time range of one frame. Of these 75 times, when the lowest gradation is refreshed, it is the 16 th bit gradation weight. At this time, the time for the lamp beads to be lighted is only t/1024, which is the upper limit of the gray scale that can be achieved by the screen. The 16-bit gray scale weight value corresponds to 73 times of refreshing of the lamp beads, and the next 2 times of refreshing is realized by adopting a space gray scale refreshing method. When the 17 th bit has gray information, two lamp beads are adopted to form a space gray refreshing strategy of a pixel unit, and when the 18 th bit has information, four lamp beads are adopted to form a space refreshing strategy of a pixel unit. That is, when the gradation data is converted into refresh data for display by the LED display screen, the gradation data needs to be processed. The gray level part which can be reached by the screen is processed according to the normal refreshing flow, and the gray level part which can not be reached by the screen is refreshed by adopting a space gray level strategy.

When the screen plays a 60HZ video stream, it refreshes 60 pictures, i.e. 60 frames, for 1 second. When the gray scale capability of the screen is 16-bit gray scale, if the played video stream contains 20-bit gray scale, the normal gray scale weight is 16 bits, and the low gray scale weight is 4 bits.

The first bit of the low gray scale weight is based on the lowest brightness which can be achieved by a single lamp bead of the screen, the corresponding brightness is half of the lowest brightness of the screen, the second bit is half of the first bit, and so on. Each time the brightness is halved, the number of light beads that represent the current frame is halved, and the frame time for expressing the gray scale is prolonged, i.e. the display data for low gray scale weights will be compressed. The gray weight of the first bit, in terms of frame number, is compressed by one half; the second bit is one quarter.

In the time of one frame, each weight has a corresponding order according to the gray weight, and the corresponding relation is shown in the following table 2.

For refreshing in different orders, the numbers of the lamp beads are different, wherein the order 17 corresponds to the 74 th refreshing, the whole screen lamp beads are divided into A, B groups, and every two lamp beads are one pixel unit. The sequence 18 corresponds to 75 times of refreshing, the whole screen is divided into A, B, C, D groups, and every four lamp beads are one pixel unit.

To ensure that the resolution of the screen is not affected, when one lamp bead is lighted in one area, the lamp beads in the same pixel unit corresponding to the lamp bead are sequentially lighted in the next frames. The lower the refreshing gray scale, the more the number of times of disassembly. In each frame, only the part of low-ash content needing refreshing is displayed, and the content is complemented by continuous low-ash refreshing, so that the purposes of reducing brightness and not losing resolution are achieved.

As shown in FIG. 10, the boxes in the middle of the figure represent that in an area, the screen is to refresh a low gray screen. In normal low gray refresh, the beads will display the block completely with the lowest brightness in four consecutive frames, so that the whole pixel information of each frame block will be displayed completely in four consecutive frames. After the space gray level refreshing strategy is applied, the pixel density of the square block is 1/4 of that of normal refreshing in each frame, but in the continuous 4-frame time, the square block is refreshed in sequence through the grouping of the pixels, and other pixels to be displayed in the square block are gradually supplemented, so that complete pixel display is realized, and the brightness is reduced to 1/4 of that of the original pixel.

According to the LED screen driving method, when the driving refresh exceeds the lowest brightness part gray level which can be achieved by the lamp beads, a space gray level refreshing strategy is adopted. Which follows the following basic principles:

1. the minimum brightness of the lamp beads is not changed on the premise, and the time of the lamp beads is changed by changing the lighting quantity of the lamp beads.

2. The total brightness in unit time is halved when the gray weight is increased by one bit, so that the number of the lighted lamp beads is halved on the basis of space gray scale.

3. In order to ensure that the pixel information is not lost too much, the space gray scale is filled with the residual image through continuous refreshing, and the larger the gray scale weight, namely the lower the brightness, the longer the frame number time is needed to fill the pixels.

The multi-dimensional gray scale expression method combining time gray scale and space gray scale is provided, so that the effect of playing a higher gray scale expression force under the limited gray scale capability is achieved, and the improvement of the gray scale effect of the LED screen can be realized.

It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the application also provides an LED display screen driving device. The implementation scheme of the device for solving the problem is similar to that described in the above method, so the specific limitation of the embodiment of the LED display driving device provided below can be referred to the limitation of the LED display driving method hereinabove, and will not be repeated here.

In one embodiment, as shown in fig. 11, there is provided an LED display screen driving apparatus comprising: a data stream acquisition module 1102, a normal gray control module 1104, a frequency acquisition module 1106, a pixel unit determination module 1108, a low gray control module 1110, wherein:

a data stream obtaining module 1102, configured to obtain a display data stream, where the display data stream includes gray data of each frame; the gray data comprises normal gray weights and low gray weights which are orderly sequenced in a refreshing sequence; the low gray scale weight is the gray scale limited by the first driving mode beyond the minimum brightness requirement for the screen to light up.

The normal gray control module 1104 is configured to drive the LED display screen to refresh according to the first driving mode corresponding to the normal gray weight according to the refresh order of the gray weight.

The pixel unit determining module 1106 is configured to obtain a refresh order of the low gray scale weights, determine pixel units according to the refresh order, where each bead in the pixel units belongs to different categories.

The low gray level control module 1108 is configured to drive different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh sequence to be sequentially turned on; the number of the lamp beads in the pixel unit is doubled along with the increase of the refreshing sequence of the low gray scale weight.

In another embodiment, the pixel unit determining module is configured to determine two lamp beads as one pixel unit according to the refresh times of the first low gray scale weight.

In another embodiment, the low gray level control module is configured to drive different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order and the frame corresponding to the next refresh order to be sequentially turned on.

In another embodiment, the low gray level control module is further configured to drive different types of light beads in the pixel units of the target display area of the frame corresponding to the previous refresh order, and the frame corresponding to the next refresh order to be sequentially turned on.

In another embodiment, the low gray level control module is further configured to drive different types of light beads in the pixel units of the target display area of the frame corresponding to the previous refresh order and the frame corresponding to the previous refresh order to be sequentially turned on.

In another embodiment, the normal gray control module is configured to perform display control according to the refresh frequency of the first normal gray weight; and performing display control according to the lighting time of the lamp beads corresponding to the second normal gray scale weight.

The above-mentioned control of each module in the LED display screen driving device may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer device is provided, which may be a controller, the internal structure of which may be as shown in fig. 12. The computer device includes a processor, a memory, a communication interface, and a display screen connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a method of driving an LED display screen. The display of the computer device may be a liquid crystal display or an electronic ink display.

It will be appreciated by those skilled in the art that the structure shown in fig. 12 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the LED display driving method in each of the above embodiments when executing the computer program.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the LED display driving method in the above embodiments.

In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the LED display screen driving method in the above embodiments.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims

1. A method of driving an LED display screen, the method comprising:

acquiring a display data stream, wherein the display data stream comprises gray data of each frame; the gray data comprises normal gray weight values and low gray weight values which are orderly sequenced in a refreshing sequence; the low gray scale weight is a gray scale which is limited by the first driving mode and exceeds the minimum brightness requirement of screen lighting;

2. The method of claim 1, wherein when the low gray scale weight is a first low gray scale weight arranged after a last normal gray scale weight, the determining the pixel cell according to the refresh order comprises:

3. The method according to claim 1, wherein when there is no overlap between the target display area of the frame corresponding to the next refresh and the target display area of the frame corresponding to the next refresh, the driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order sequentially lights up, includes:

4. The method according to claim 1, wherein when there is no overlap between the target display area of the next refresh corresponding frame and the target display area of the previous refresh corresponding frame, the driving the different types of light beads in the pixel units of the target display area of the current refresh order corresponding frame sequentially lights up, includes:

and driving different types of lamp beads in the pixel units of the target display area of the current refresh order corresponding frame, the previous refresh order corresponding frame and the next refresh order corresponding frame to be sequentially lighted.

5. The method according to claim 1, wherein when there is no overlap between the target display area of the frame corresponding to the current refresh and the frame corresponding to the previous refresh, the driving the different types of light beads in the pixel units of the target display area of the frame corresponding to the current refresh order sequentially lights up, includes:

and driving different types of lamp beads in the pixel units of the target display area of the frame corresponding to the current refreshing sequence and the frame corresponding to the last refreshing sequence to be sequentially lighted.

6. The method of any of claims 1-5, wherein the normal gray weights comprise a first normal gray weight and a second normal gray weight ordered after the first normal gray weight;

7. An LED display screen driving apparatus, the apparatus comprising:

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.

9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.