Scanning method and device, LED display unit and LED display screen

Abstract

The embodiment of the invention provides a scanning method and device, an LED display unit and an LED display screen, the LED display unit comprises C * D LED lamp bead arrays, each LED lamp bead array comprises n rows and m columns of LED lamp beads, the first poles of the LED lamp beads located in the same row in each LED lamp bead array are connected with the same output end of a row driver, and the second poles of the LED lamp beads located in the same row in each LED lamp bead array are connected with the same output end of the row driver. And the second poles of the LED lamp beads in the same column are connected with the same output end of the column driver. For a column of LED lamp bead arrays of the LED display unit, the number of LED lamp beads controlled by one output end of the column driver can be adjusted. And after the LED display unit determines the target number, determining a scanning mode according to the target number. By the adoption of the scheme, high-brightness LED lamp beads do not need to be adopted or a circuit does not need to be redesigned, the scanning mode is adjusted by changing the number of the LED lamp beads controlled by the column driver, the purpose of changing the brightness of the LED display unit is achieved, and cost is low.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of LED display, and particularly to a scanning method, device, LED display unit and LED display screen. Background Art

[0002] With the development of technology, the light emitting diode (LED) display technology has become more and more mature. Due to its energy conservation, environmental protection, low installation energy consumption, good color reducibility and easy control, etc., it has become the mainstream light source of display screens and is widely used in indoor and outdoor display screen products.

[0003] At present, most LED display screens are composed of several LED display units spliced together. The LED display unit includes a box body, an LED lamp board arranged on the front of the box body, a control circuit arranged in the box body, etc. The LED lamp board includes a printed circuit board (PCB) and LED lamp beads soldered on the PCB board, etc. An LED lamp bead includes three primary color LEDs encapsulated together, namely red (R), green (G), and blue (B) primary color LEDs. The control system of the LED display unit controls the duty cycle of the lighting time of the RGB three primary color LEDs, so that the LED lamp beads present different colors. The LED display unit usually adopts a scanning method to perform display control, and the scanning method determines the maximum brightness of the LED display screen. In the traditional scanning method, the row driver is used to control which row of LED lamp beads is lit, and the column driver is used to control which LED lamp beads in this row of LED lamp beads emit light and which LED lamp beads do not emit light.

[0004] In the above scanning method, the maximum brightness of the LED display unit is fixed. If higher brightness is required, the LED lamp beads need to be replaced with higher brightness LED lamp beads, which is costly. Summary of the Invention

[0005] The embodiments of the present application provide a scanning method, device, LED display unit and LED display screen, which adjust the scanning method by changing the number of LED lamp beads controlled by the column driver, and further achieve the purpose of changing the brightness of the LED display unit.

[0006] In a first aspect, the embodiments of the present application provide a scanning method, including:

[0007] Determine the target quantity, where the target quantity is the number of LED beads in the same column of the LED display unit that are controlled by the same column driver. The LED display unit includes C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads;

[0008] Determine the scanning method according to the target quantity, where the scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target quantity.

[0009] In a second aspect, an embodiment of the present application provides a scanning device, including:

[0010] A processing module for determining the target quantity, where the target quantity is the number of LED beads in the same column of the LED display unit that are controlled by the same column driver. The LED display unit includes C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads;

[0011] A determination module for determining the scanning method according to the target quantity, where the scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target quantity.

[0012] In a third aspect, an embodiment of the present application provides an LED display unit, including: C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads;

[0013] A processor, a memory, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method described in the first aspect or various possible implementation manners of the first aspect above.

[0014] Fourthly, an embodiment of the present application provides an LED display screen, which is formed by splicing a plurality of LED display units as described in the third aspect or various possible implementation manners of the third aspect above.

[0015] The scanning method, device, LED display unit and LED display screen provided by the embodiments of the present application. The LED display unit includes C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. The first poles of the LED beads in the same row in each LED bead array are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. For a column of LED bead arrays of the LED display unit, the number of LED beads controlled by one output terminal of the column driver, that is, the target number, can be adjusted by setting a resistor or not setting a resistor between the corresponding columns of adjacent LED arrays, setting a column driver or not setting a column driver between the corresponding columns of adjacent LED arrays, etc. After the LED display unit determines the target number, it determines the scanning method according to the target number. This scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target number. By adopting this solution, there is no need to use high-brightness LED beads or redesign the circuit. Instead, the scanning method is adjusted by changing the number of LED beads controlled by the column driver, so as to adjust the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads. The larger the ratio, the greater the brightness of the LED display unit; the smaller the ratio, the smaller the brightness of the LED display unit, thus achieving the purpose of changing the brightness of the LED display unit and with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the static drive circuit diagram of the LED display unit;

[0018] Figure 2A is Figure 1 the drive circuit of the red diode in

[0019] Figure 2B is Figure 1 the drive circuit of the green diode in

[0020] Figure 2C is Figure 1 the drive circuit of the blue diode in

[0021] Figure 3 It is a schematic diagram of an LED display unit in a dynamic scanning mode;

[0022] Figure 4 It is a flowchart of the scanning method provided by the embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of an LED display unit applicable to the scanning method provided by the embodiment of the present application;

[0024] Figure 6 It is a schematic diagram of a group of LED lamp beads in the scanning method provided by the embodiment of the present application;

[0025] Figure 7 It is Figure 6 A schematic diagram of the drive circuit when the scanning mode of the LED display unit is 1 / n scan;

[0026] Figure 8 It is Figure 6 A schematic diagram of the drive circuit when the scanning mode of the LED display unit is 1 / 2n scan;

[0027] Figure 9 It is a schematic diagram of a scanning device provided by the embodiment of the present application;

[0028] Figure 10 It is a schematic diagram of the structure of the LED display unit provided by the embodiment of the present application. Detailed implementation manners

[0029] The basic principle of an LED is that by applying an appropriate voltage across the two ends of the LED, the LED can emit light. An LED display screen is composed of a plurality of LED display units spliced together. An LED display unit usually includes a plurality of LED lamp beads, and each LED lamp bead includes three primary color LEDs encapsulated together, namely red (R), green (G), and blue (B) primary color LEDs. The control system of the LED display unit controls the duty cycle of the lighting time of the RGB primary color LEDs, so that the LED lamp beads present different colors. Finally, a plurality of LED lamp beads are combined to form a display screen of various colors.

[0030] The display control modes of the LED display unit are divided into a static scanning mode and a dynamic scanning mode. In the static scanning mode, the LED display unit needs to separately control the lighting time of the light-emitting diodes of each primary color of each LED lamp bead. The chip that controls each primary color LED is called an LED driver. Figure 1 It is a static drive circuit diagram of the LED display unit.

[0031] Please refer to Figure 1, an LED lamp bead includes three light-emitting diodes encapsulated together, namely a red diode, a green diode, and a blue diode, as shown by R, G, and B in the figure. The positive electrodes of the respective light-emitting diodes are connected to the power supply VCC, and the negative electrodes of the respective light-emitting diodes are respectively connected to the drivers corresponding to their colors.

[0032] According to Figure 1 It can be obtained that Figures 2A to 2C . Figure 2A is Figure 1 the drive circuit of the red diode in Figure 2B is Figure 1 the drive circuit of the green diode in Figure 2C is Figure 1 the drive circuit of the blue diode in

[0033] The main feature of the static scanning method is that the respective primary-color light-emitting diodes of each LED lamp bead correspond to different drivers, and each primary-color light-emitting diode is controlled by one channel of the driver. When the number of LED lamp beads is large, that is, when the LED display unit contains a relatively large number of LED lamp beads, the number of required drivers is excessive, resulting in a complex circuit of the LED display unit, low hardware utilization rate, huge cost, and even inability to implement.

[0034] In the dynamic scanning method, all the LED lamp beads of the LED display unit are divided into N rows. If a frame of the picture is to be displayed, first send the data of the first row through the row driver, then select and light up the LED lamp beads in the first row through the column driver. After that, send the data of the second row, and similarly select and light up the LED lamp beads in the second row; scan all the rows in sequence, that is, a frame of the picture is given. Among them, lighting up means that the LED lamp beads in one row are simultaneously controlled by the row driver and the column driver.

[0035] Figure 3 is a schematic diagram of the LED display unit of the dynamic scanning method. Please refer to Figure 3 , taking the light-emitting diode of any one of the three primary colors included in the LED lamp bead as an example, the LED display unit 30 includes a plurality of row drivers 31, column drivers 32, and an LED lamp bead array 33. Among them, the row drivers 31 are like the row drivers 1 to row drivers n in the figure, and the LED lamp bead array 33 includes a plurality of LED lamp beads arranged in a matrix.

[0036] It should be noted that an LED lamp bead includes the R, G, and B primary-color LEDs encapsulated together, Figure 3 the light-emitting diodes in Figure 3If the LED in it is a red LED, the red LED is divided into several rows and several columns. The several rows are like H1, H2... Hn, and the several columns are like L1, L2... Lm. Each row is connected to the corresponding row driver 31, and all the red LEDs are connected to the corresponding output terminals of the column driver 32. The row drivers 1 to n respectively receive the row driving signals Hs1 to Hsn and output the row signals H1 to Hn. The column driver 32 receives the column driving signal Ls from the control system of the LED display unit and generates the control signals for each column of LEDs, such as L1, L2... Lm in the figure.

[0037] Please refer to Figure 3 , the row driver 31 corresponding to the first row of LED beads receives the row driving signal Hs1 and is driven, so that the working driving voltage VCC is loaded on the positive electrodes of the first row of LED beads. The column driver 32 receives the column driving signal Ls, thus lighting up the first row of LED beads. Through the column driving signal Ls, it is determined which LED beads in the first row of LED beads emit light and which do not. The meaning of lighting up is that a row of LED beads is simultaneously loaded with voltage and controlled by the column driver. As for whether to emit light, the column driving signal Ls determines which LED beads in this row of LED beads emit light and which do not. In the same way, all the row LED beads are lit up in turn, thus presenting a frame of picture.

[0038] It should be noted that since the time interval between successive lighting is very short, usually only 0.2 milliseconds from lighting one row to the next lighting, and the human eye has the visual persistence effect. Therefore, what the human eye observes is that all rows are lit up simultaneously.

[0039] Since the maximum luminous brightness of the LED beads is fixed, the scanning method determines the time when the LED beads emit light within a display cycle. Therefore, the scanning method determines the maximum brightness of the LED display unit. For example, if there are 8 row drivers in a scanning cycle, at the same time within the same scanning cycle, only 1 / 8 of the LED beads are lit up, and the maximum brightness of the LED display unit = the brightness when all the LED beads emit light simultaneously / 8. This scanning method is called 1 / 8 scan or 8 scan.

[0040] Similarly, if there are 16 row drivers in a scanning cycle, at the same time within the same scanning cycle, only 1 / 16 of the LED beads are lit up, and the maximum brightness of the LED display unit = the brightness when all the LED beads emit light simultaneously / 16. This scanning method is called 1 / 16 scan or 16 scan.

[0041] Taking 16 rows of LEDs as an example, if 1 / 8 scan is adopted, 2 rows of LED beads are lit at the same time; if 1 / 16 scan is adopted, only 1 row of LED beads is lit at the same time. Obviously, the brightness of 1 / 8 scan is twice that of 1 / 16 scan.

[0042] The scan period is fixed and determined by the frame rate of the picture. Therefore, using the same LED beads, the brightness of 1 / 8 scan is twice that of 1 / 16 scan.

[0043] As can be seen from the above: when the scan method is fixed, the maximum brightness of the LED display unit is fixed. If higher brightness is required, higher-brightness LED beads need to be replaced. In practice, LED beads account for more than 50% of the cost of the LED display screen. Moreover, the difference in the luminous brightness between conventional LED beads and high-brightness LED beads is not large. Even if higher-brightness LED beads are replaced, the brightness increase is only about 50%. Moreover, the price of high-brightness LED beads is 2-3 times that of conventional LED beads. If the brightness needs to be increased, the cost is high and the increase amplitude is limited.

[0044] Based on this, the embodiments of the present application provide a scanning method, device, LED display unit and LED display screen, which adjust the scanning method by changing the number of LED beads controlled by the column driver, so as to achieve the purpose of changing the brightness of the LED display screen.

[0045] The scanning method provided by the embodiments of the present application is applicable to the LED display unit. The LED display unit provided by the embodiments of the present application can be used alone, or multiple LED display units can be spliced into a large screen, that is, an LED display screen, according to on-site requirements.

[0046] Figure 4 It is a flowchart of the scanning method provided by the embodiments of the present application. The execution subject of this embodiment is the LED display unit, and this embodiment includes:

[0047] 401. Determine the target quantity, where the target quantity is the number of LED beads controlled by the same column driver among the LED beads in the same column of the LED display unit. The LED display unit includes C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads.

[0048] An embodiment of the present application provides an LED display unit with adjustable scanning methods. An LED display unit includes one or more LED bead arrays, that is, an LED display unit includes C×D LED bead arrays, where C≥1 and is an integer, and D≥1 and is an integer. An LED bead array includes n×m LED beads, where n≥1 and is an integer, and m≥1 and is an integer. Each LED bead includes a red diode, a green diode, and a blue diode packaged together. The light-emitting diodes of different colors respectively have independent row drivers and column drivers. Unless otherwise specified below, the scanning method in the embodiments of the present application refers to the scanning drive of any one color, and the row driver and the column driver are the drivers of the diodes of the corresponding color. The row driver is controlled by a row drive signal, and the column driver is controlled by a column drive signal.

[0049] In the embodiments of the present application, one column of the LED display unit includes C LED bead arrays and C×n LED beads. Among the LED bead arrays in the same column, there may be two situations between each LED bead array: Situation 1: This LED bead array has an independent column driver, and no resistor is provided between the corresponding columns of this LED bead array and the adjacent LED bead arrays; Situation 2: This LED bead array does not have an independent column driver, and a resistor is provided between the corresponding columns of this LED bead array and the adjacent LED bead arrays.

[0050] Based on the above structure, the number of LED bead arrays controlled by one column driver can be flexibly set. For example, in a column of LED bead arrays, if each LED bead array has an independent column driver, then one output terminal of a column driver controls n LED beads.

[0051] Again, for example, in a column of LED bead arrays, only the column driver of any one LED bead array is retained, and a resistor is provided between the corresponding columns of every two adjacent LED bead arrays. Then one output terminal of the column driver controls C×n LED beads.

[0052] Another example is to divide a column of LED bead arrays into multiple groups. A resistor is provided between the corresponding columns of two adjacent LED bead arrays in each group of LED bead arrays, and the column driver of any one LED bead array in the group is retained. No resistor is provided between the corresponding columns of adjacent groups of LED bead arrays. In this way, the number of LED beads controlled by one output terminal of the column driver is related to the number of LED bead arrays in each group of LED bead arrays.

[0053] Next, taking C = x and D = 1 as an example, how to determine the target number will be described in detail. Figure 5 It is a schematic diagram of an LED display unit to which the scanning method provided by the embodiments of the present application is applicable. Please refer to Figure 5, C = x, D = 1. That is to say, the LED display unit includes x LED lamp bead arrays arranged in a column, and each LED lamp bead array includes n rows and m columns of LED lamp beads. For any LED lamp bead array, the first poles of the LED lamp beads in the same row of the LED lamp bead array are connected to the same output terminal of the row driver. The second poles of the LED lamp beads in the same column of the LED lamp bead array are connected to the same output terminal of the column driver.

[0054] It should be noted that although Figure 5 in [reference], series resistors are set between the corresponding columns of two adjacent LED lamp bead arrays, and column drivers are set between two adjacent LED lamp bead arrays, such as Figure 5 series resistor ab, series resistor bc, column driver a, and column driver b in [reference]. However, in practice, if series resistors are set between the corresponding columns of two adjacent LED lamp bead arrays, column drivers may not be set between the two LED lamp bead arrays. For example, a column of LED lamp bead arrays is divided into multiple groups, and each group has 4 LED lamp bead arrays. Then, resistors are set between the corresponding columns of every two adjacent LED lamp bead arrays, and this group of LED lamp bead arrays has a column driver, which is set between any two LED lamp bead arrays, or the column driver is only adjacent to the outermost LED lamp bead arrays.

[0055] In the embodiments of the present application, for a column of LED lamp bead arrays in the LED display unit, the number of LED lamp beads controlled by one output terminal of the column driver, that is, the target number, can be adjusted by setting whether there are resistors and column drivers between the corresponding columns of adjacent LED arrays. Therefore, the LED display unit can determine the target number according to the number of resistors and column drivers in a column of LED lamp bead arrays.

[0056] 402. Determine a scanning method according to the target number, where the scanning method is used to indicate that the ratio of the total number of LED lamp beads in the LED display unit to the number of simultaneously lit LED lamp beads is 1 / target number.

[0057] After the LED display unit determines the target number, it determines the scanning method according to the target number. The larger the target number, the larger the number of LED lamp beads controlled by one output terminal of the column driver, and the smaller the number of simultaneously lit LED lamp beads; if the target number is smaller, the smaller the number of LED lamp beads controlled by one output terminal of the column driver, and the larger the number of simultaneously lit LED lamp beads.

[0058] The scanning method provided by the embodiment of the present application, the LED display unit includes C×D LED bead arrays, each LED bead array includes n rows and m columns of LED beads. For the LED beads in the same row of each LED bead array, the first poles of the LED beads are connected to the same output terminal of the row driver, and for the LED beads in the same column, the second poles of the LED beads are connected to the same output terminal of the column driver. For a column of LED bead arrays in the LED display unit, the number of LED beads controlled by one output terminal of the column driver, that is, the target number, can be adjusted by setting resistors or column drivers between corresponding columns of adjacent LED arrays. After the LED display unit determines the target number, it determines the scanning method according to the target number. This scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target number. Adopting this solution, there is no need to use high-brightness LED beads or redesign the circuit. Instead, the scanning method is adjusted by changing the number of LED beads controlled by the column driver, so as to adjust the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads. The larger the ratio, the higher the brightness of the LED display unit; the smaller the ratio, the lower the brightness of the LED display unit, thus achieving the purpose of changing the brightness of the LED display unit with low cost.

[0059] Optionally, in the above embodiment, the first pole is the positive pole of the LED bead, and the second pole is the negative pole of the LED bead; or, the first pole is the negative pole of the LED bead, and the second pole is the positive pole of the LED bead.

[0060] In the embodiment of the present application, the connection methods of the row driver, column driver, and LED beads are not limited. For example, please refer to Figure 5 , the positive poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the negative poles of the LED beads in the same column are connected to the same output terminal of the column driver. In other feasible implementation manners, the negative poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the positive poles of the LED beads in the same column are connected to the same output terminal of the column driver.

[0061] Adopting this method, the positive pole of the LED bead is connected to the row driver and the negative pole is connected to the column driver; or, the negative pole of the LED bead is connected to the row driver and the positive pole is connected to the column driver, achieving the purpose of flexibly connecting the row driver, column driver, and LED beads.

[0062] Optionally, in the above embodiment, the LED display unit determines the target number according to the setting status of the resistors between corresponding columns of every two adjacent LED bead arrays in the same column of LED beads.

[0063] In the embodiments of the present application, the larger the number of LED beads controlled by the same output terminal of the column driver, the smaller the number of simultaneously lit LED beads; if the number of LED beads controlled by the same output terminal of the column driver is smaller, the number of simultaneously lit LED beads is larger. Therefore, the scanning method can be changed by changing the number of LED beads controlled by the column driver. To change the number of LED beads controlled by the column driver, a resistor needs to be set between the corresponding columns of an array of LED beads in a column. In an array of LED beads in a column, the setting condition of the resistor determines the size of the target number. For example, a resistor can be set between the corresponding columns of every two adjacent LED bead arrays; another example is that in the same column of LED bead arrays, every three LED bead arrays form a group, and a resistor is set between the corresponding columns of two adjacent LED bead arrays within the group, but no resistor is set between the LED bead arrays of different groups. In the same column of LED bead arrays, if the setting condition of the resistor is different, the target number is different.

[0064] Adopting this solution, the LED display unit determines the target number according to the setting condition of the resistor between the corresponding columns of every two adjacent LED bead arrays among the LED beads in the same column, achieving the purpose of accurately and quickly determining the target number.

[0065] Optionally, in the above embodiment, when no resistor is set between the corresponding columns of every two adjacent LED bead arrays among the LED beads in the same column of the display unit, the target number is determined to be n, and different LED bead arrays in the same column correspond to different column drivers.

[0066] Exemplarily, in the embodiments of the present application, an LED display unit includes C×D LED bead arrays, and there are C LED bead arrays in a column. If all the series resistors are removed from these C LED bead arrays and all the column drivers are not removed, then one output terminal of the column driver controls n LED beads. At this time, the scanning method is 1 / n scan.

[0067] When a resistor is set between the corresponding columns of two adjacent LED bead arrays among the C×D LED bead arrays, the target number is determined to be C multiplied by n, and each LED bead array in the same column corresponds to the same column driver.

[0068] Exemplarily, in the embodiments of the present application, an LED display unit includes C×D LED bead arrays, there are C LED bead arrays in a column, and an LED bead array includes n rows and m columns of LED beads. If all the series resistors are not removed from these C LED bead arrays and only one LED bead array is provided with a column driver among the C LED bead arrays, at this time, one output terminal of the column driver controls C×n LED beads, and the scanning method is 1 / C×n scan.

[0069] When the scanning method is 1 / n scanning, the first number of LED lamp beads lit at the same time is: total number / n; when the scanning method is 1 / C×n scanning, the second number of LED lamp beads lit at the same time is: total number / C×n. Wherein, the total number is the total number of LED lamp beads of the LED display unit. Obviously, the first number is C times the second number. Therefore, if the brightness of the LED display unit is the first brightness when the scanning method is 1 / n scanning and the brightness of the LED display unit is the second brightness when the scanning method is 1 / C×n scanning, then the first brightness is C times the second brightness.

[0070] Please refer to Figure 5 , when C = x, D = 1, an LED lamp bead array includes n rows and m columns of LED lamp beads, if all series resistors are removed and an independent column driver is set for each LED lamp bead array, then one output terminal of the column driver controls n LED lamp beads. At this time, the scanning method is 1 / n scanning, and the brightness of the LED display unit is the maximum.

[0071] If all series resistors are not removed and only the column driver of one LED lamp bead array is retained, then one output terminal of the column driver controls xn LED lamp beads. At this time, the scanning method is 1 / xn scanning, and the brightness of the LED display unit is the minimum. The maximum brightness is x times the minimum brightness.

[0072] Adopting this solution, the maximum or minimum brightness of the LED display unit can be achieved by removing all series resistors and setting an independent column driver for each LED lamp bead array, or not removing all series resistors and only retaining the column driver of one LED lamp bead array.

[0073] In the above embodiments, the LED lamp bead arrays in the same column of the LED display unit can also be evenly divided into p groups, with q LED lamp bead arrays in each group. When resistors are provided between the corresponding columns of the q LED lamp bead arrays belonging to the same group and no resistors are provided between adjacent groups of LED lamp bead arrays, the target number is determined to be q multiplied by n, and each LED lamp bead array belonging to the same group corresponds to the same column driver.

[0074] In the embodiments of the present application, in order to make the brightness of the LED display unit between the maximum brightness and the minimum brightness, the combination mode of the resistor and the column driver can be adjusted, so as to realize more scanning modes, and the brightness corresponding to different scanning modes is different. For this reason, an LED display unit includes a C×D LED bead array, there are C LED bead arrays in one column, the C LED bead arrays are divided into p groups, and each group has q LED bead arrays. Resistors are arranged between the corresponding columns of two adjacent LED bead arrays in each group of LED bead arrays, and the column driver of any one LED bead array in the group is reserved, and no resistor is arranged between the corresponding columns of two adjacent groups of LED bead arrays. In this way, the number of LED beads controlled by one output terminal of the column driver is q×n. At this time, the scanning mode is 1 / q×n.

[0075] When the scanning mode is 1 / q×n scan, the number of LED beads lit at the same time is: total number / q×n, corresponding to the third brightness. And the maximum brightness of the LED display screen is total number / n. Obviously, the maximum brightness is q times the third brightness.

[0076] For example, when C = 6, D = 1, p = 2, and q = 3, a column of LED bead arrays is divided into 2 groups, and each group has 3 LED arrays. Then there are a total of 3 column drivers. The number of LED beads controlled by the same output terminal of each column driver, that is, the target number is 3n, and the scanning mode is 1 / 3n. Based on this scanning mode, the number of LED beads lit at the same time is: total number / 3n. And the maximum brightness of the LED display screen is total number / n. Obviously, the maximum brightness is 3 times the brightness when the scanning mode is 1 / 3n.

[0077] In the above embodiments, if the combination mode of the resistor and the column driver is different, the number of column drivers is different. Therefore, the combination mode of the resistor and the column driver can be adjusted to balance the number of column drivers and the brightness of the LED display unit.

[0078] Adopting this solution, by adjusting the combination mode of the resistor and the column driver in the LED display unit, more scanning modes can be realized.

[0079] Under normal circumstances, if the brightness of the LED display unit is doubled, most requirements can be met. If too many scanning modes are compatible, it will increase the design difficulty, resulting in disadvantages such as inability to design or the need to increase the Printed Circuit Board (PCB) layer. Therefore, in the above embodiments, q is usually set to 2, that is, two LED bead arrays in each group. At this time, the design difficulty is small, there is no need to increase the PCB difficulty, and the effect of doubling the brightness can be achieved.

[0080] Figure 6It is a schematic diagram of a group of LED lamp beads in the scanning method provided by an embodiment of the present application. Please refer to Figure 6 , divide the LED lamp bead arrays in the same column in the LED display unit into p groups on average, with 2 LED lamp bead arrays in each group, that is, q = 2. Figure 6 Schematically shows a group of LED lamp beads.

[0081] Please refer to Figure 6 , by setting a resistor ab between the corresponding columns of the LED lamp bead array a and the LED lamp bead array b, but only retaining the column driver a or the column driver, the target number is 2n, so as to achieve 1 / 2n scanning. Or, by not setting a resistor ab between the corresponding columns of the LED lamp bead array a and the LED lamp bead array b and retaining the column driver a or the column driver at the same time, the target number is n, so as to achieve 1 / n scanning. When using the 1 / n scanning method, the brightness of the LED display unit is twice that of the 1 / 2n scanning method.

[0082] Figure 7 is Figure 6 A schematic diagram of the drive circuit when the scanning method of the LED display unit is 1 / n scan. Please refer to Figure 6 and Figure 7 , remove Figure 6 the series resistor ab in, and retain the column driver a and the column driver b at the same time, then Figure 7 can be obtained. Figure 7 In, the number of LED lamp beads controlled by one output terminal of the column driver a is n, and the number of LED lamp beads controlled by one output terminal of the column driver b is n. That is to say, the column driver a and the column driver b each control an n-row scanning area. Based on this design, the scanning method of the LED display unit is 1 / n.

[0083] Please refer to Figure 7 , the control system of the LED display unit sends row drive signals Hs1 to Hsn to the row drivers a1 to an respectively, so that the row drivers a1 to an generate corresponding row signals Hsa1 to Hsan. Similarly, the control system sends row drive signals Hsb1 to Hsbn to the row drivers b1 to bn respectively, so that the row drivers b1 to bn generate corresponding row signals Hb1 to Hbn. In the two LED lamp bead arrays, the row drive signals received by the corresponding row drivers are the same, and the generated row signals are the same. For example, the row drive signal Hsa1 received by the row driver a1 is the same as the row drive signal Hsb1 received by the row driver b1, and the row signal Ha1 generated by the row driver a1 is the same as the row signal Hb1 generated by the row driver b1. The column drive signal Las received by the column driver a and the column drive signal Lbs received by the column driver b are different.

[0084] Figure 8 is Figure 6 Schematic diagram of the drive circuit when the scanning method of the LED display unit is 1 / 2n scan. Please refer to Figure 6 and Figure 8 , retain Figure 6 the series resistor ab in, and only retain any one of column driver a and column driver b, Figure 8 if what is shown in is to retain column driver b, then we can obtain Figure 8 . Figure 8 In, the number of LED lamp beads controlled by one output terminal of column driver b is 2n. Based on this design, the scanning method of the LED display unit is 1 / 2n.

[0085] Please refer to Figure 8 , the control system of the LED display unit sends row drive signals Hsa1 to Hsan to row drivers a1 to an respectively, so that row drivers a1 to an generate corresponding row signals Ha1 to Han. Similarly, the control system sends row drive signals Hsb1 to Hsbn to row drivers b1 to bn respectively, so that row drivers b1 to bn generate corresponding row signals Hb1 to Hbn. In the two LED lamp bead arrays, the row drive signals received by the corresponding row drivers are different, and the generated row signals are different. For example, the row drive signal Hsa1 received by row driver a1 and the row drive signal Hsb1 received by row driver b1 are different, and the row signal Ha1 generated by row driver a1 and the row signal Hb1 generated by row driver b1 are different. The column drive signal Las received by column driver a and the column drive signal Lbs received by column driver b are the same.

[0086] The above Figure 7 embodiment, the scanning method is 1 / n, Figure 8 in the shown embodiment, the scanning method is 1 / 2n. Figure 7 The brightness of the shown LED display unit is Figure 8 twice the brightness of the shown LED display unit. Obviously, in the embodiments of the present application, by adjusting the combination mode of the column driver and the series resistor, the scanning method can be changed. Through the signal adjustment of the control system as a cooperation, the switching of the scanning method is realized. For example, the default scanning method is 1 / 2n scan. When it is necessary to increase the brightness of the LED display unit, some series resistors are removed and column drivers are added, and the number of LED lamp beads controlled by one output terminal of the column driver is reduced, that is, the target number is reduced, so as to increase the number of LED lamp beads lit at the same time, and the brightness of the LED display unit is improved.

[0087] If the method of replacing with higher brightness LED lamp beads is adopted, usually only about 50% of the brightness can be increased.

[0088] In this solution, q is usually set to 2, that is, there are two LED bead arrays in each group. At this time, the design difficulty is relatively small, there is no need to increase the difficulty of the PCB, and the effect of doubling the brightness can be achieved.

[0089] Optionally, in the above embodiment, after the LED display unit determines the scanning method according to the target quantity, it also determines the row driving signals of the row drivers of each row of the display unit and the driving signals of the column drivers of the LED display unit according to the target quantity.

[0090] Exemplarily, the target quantity is usually at least 1 times of n. When the target quantity is 1 times of n, it means that each LED bead array has an independent column driver. At this time, the row driving signals received by the row drivers corresponding to the same row of each LED bead array are the same, and the output row signals are also the same. However, the column driving signals received by each column driver are different, so as to achieve 1 / n scan.

[0091] When the target quantity is q times of n, it means that the LED bead arrays in the same column are divided into p groups, with q LED bead arrays in each group. At this time, for the LED bead arrays belonging to the same group, the row driving signals received by the row drivers corresponding to different LED bead arrays are different, and the output row signals are also different. However, for the LED bead arrays in different groups, the row driving signals received by the row drivers corresponding to the same row are the same, and the output row signals are also the same. Moreover, each group of LED bead arrays has an independent column driver. Therefore, the column driving signals received by the column drivers of different groups of LED bead arrays are different, so as to achieve 1 / qn scan.

[0092] Adopting this solution, through the signal adjustment of the control system as a cooperation, the switching of the scanning method is realized, and the switching method is simple and flexible.

[0093] Optionally, in the above embodiment, when the LED bead arrays in the same column are evenly divided into p groups, with q LED bead arrays in each group, and resistors are arranged between the corresponding columns of the q LED bead arrays belonging to the same group, and no resistor is arranged between two adjacent groups of LED bead arrays, each group of LED bead arrays has its own column driver, and the column driver of any group of LED bead arrays is located in the middle position.

[0094] Exemplarily, please refer to Figure 8 , when q = 2, any one of column driver a and column driver b is reserved, Figure 8It is shown that column driver b is retained and column driver a is removed. When q > 2, for example, q = 3, assuming that the three LED bead arrays are LED bead array 1, LED bead array 2, and LED bead array 3 from top to bottom in sequence, then the column driver of LED bead array 2 is retained, and the column drivers of LED bead array 1 and LED bead array 3 are removed. Another example, when q = 6, assuming that the six LED bead arrays are LED bead array 1, LED bead array 2, LED bead array 3, LED bead array 4, LED bead array 5, and LED bead array 6 from top to bottom in sequence, then the column driver of LED bead array 3 or LED bead array 4 is retained, and the column drivers of other LED bead arrays are removed.

[0095] Adopting this solution, when the scanning method is 1 / qn, for each group of LED bead arrays, a column driver is set for the LED bead array located in the middle position, which is convenient for connecting the column driver to each LED bead in this group of LED bead arrays, and the structure is simple and compact.

[0096] Optionally, in the above embodiments, each LED bead includes a red diode, a green diode, and a blue diode encapsulated together. The LED display unit includes a first group of diodes, a second group of diodes, and a third group of diodes, corresponding to the red diode, the green diode, and the blue diode respectively, and the scanning methods of different groups of diodes are different.

[0097] Exemplarily, in the above Figures 4 to 8 In the illustrated embodiments, the scanning drive method for any one color of light-emitting diodes is described. In actual scanning, different scanning methods can be adopted for the red diode, the green diode, and the blue diode. For example, for the red diode, 1 / n scanning is adopted; for the green diode, 1 / 2n scanning is adopted; for the blue diode, 1 / qn scanning is adopted.

[0098] Adopting this solution, by dividing the LED beads into three separate groups, each group adopts a different scanning method, and the scanning areas of each separate group are different, and the scanning method is flexible to meet different requirements.

[0099] It should be noted that, for the sake of easy understanding, in the above embodiments, the row driver is not an independent chip and can be understood as the pin of the row driving chip. A row driver is composed of the pins of different driving chips. Similarly, the column driver is also composed of the pins of different driving chips.

[0100] The following is the device embodiment of the present application, which can be used to execute the method embodiment of the present application. For the details not disclosed in the device embodiment of the present application, please refer to the method embodiment of the present application.

[0101] Figure 9It is a schematic diagram of a scanning device provided by an embodiment of the present application. The scanning device 900 is integrated on an LED display unit, and the scanning device 900 includes a processing module 91 and a determination module 92.

[0102] The processing module 91 is configured to determine a target quantity, where the target quantity is the number of LED beads controlled by the same column driver among the LED beads in the same column of the LED display unit. The display unit includes a C×D LED bead array, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads;

[0103] The determination module 92 is configured to determine a scanning method according to the target quantity, and the scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target quantity.

[0104] In a feasible implementation manner, the processing module 91 is configured to determine the target quantity according to the setting status of the resistance between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit.

[0105] In a feasible implementation manner, the processing module 91 is configured to determine that the target quantity is n when there is no resistance set between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit, and different LED bead arrays in the same column correspond to different column drivers; when there is a resistance set between the corresponding columns of two adjacent LED bead arrays among the C×D LED bead arrays, determine that the target quantity is C multiplied by n, and the LED bead arrays in the same column correspond to the same column driver.

[0106] In a feasible implementation manner, the processing module 91 is configured to evenly divide the LED bead arrays in the same column in the display unit into p groups, with q LED bead arrays in each group;

[0107] When there is a resistance set between the corresponding columns of the q LED bead arrays belonging to the same group and no resistance set between two adjacent groups of LED bead arrays, determine that the target quantity is q multiplied by n, and the LED bead arrays belonging to the same group correspond to the same column driver.

[0108] In a feasible implementation manner, q = 2.

[0109] In a feasible implementation manner, after the determining module 92 determines the scanning mode according to the target quantity, the processing module 91 is further configured to determine the driving signals of the row drivers of the LED display unit and the driving signals of the column drivers of the LED display unit according to the target quantity.

[0110] In a feasible implementation manner, the first pole is the positive pole of the LED lamp bead, and the second pole is the negative pole of the LED lamp bead; or, the first pole is the negative pole of the LED lamp bead, and the second pole is the positive pole of the LED lamp bead.

[0111] The scanning device provided by the embodiments of the present application can perform the actions of the LED display unit in the above embodiments, and its implementation principle and technical effects are similar, which will not be elaborated here.

[0112] Figure 10 is a schematic structural diagram of the LED display unit provided by the embodiments of the present application. Please refer to Figure 10 The LED display unit 1000 described in the embodiments of the present application includes: a processor 101, a memory 102, a plurality of LED lamp bead arrays 103, a row driver 104, and a column driver 105.

[0113] The memory 102 stores computer instructions;

[0114] The processor 101 executes the computer instructions stored in the memory 102, so that the processor 101 controls the row driver 104 and the column driver 105, so that the row driving signals generated by the row driver 104 and the column driving signals generated by the column driver 105 control the LED lamp bead array 103.

[0115] The specific implementation process of the processor 101 can refer to the above method embodiments, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0116] The embodiments of the present application further provide a computer-readable storage medium, in which computer instructions are stored, and when the computer instructions are executed by a processor, they are used to implement the scanning method implemented by the above LED display unit.

[0117] The embodiments of the present application further provide a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the scanning method implemented by the above LED display unit.

[0118] Those skilled in the art should understand that the embodiments of the present application can provide a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0119] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0120] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0122] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0123] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0124] A computer-readable medium includes permanent and non-permanent, removable and non-removable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0125] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0126] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A scanning method, characterized in that, it includes: Determine the target quantity, where the target quantity is the number of LED beads in the same column of the LED display unit that are controlled by the same column driver. The LED display unit includes a C×D LED bead array, each LED bead array includes n rows and m columns of LED beads. In each LED bead array, the first poles of the LED beads in the same row are connected to the same output terminal of the row driver, and the second poles of the LED beads in the same column are connected to the same output terminal of the column driver. The LED beads in the same column of the LED display unit include C×n LED beads; According to the target quantity, determine the scanning method, where the scanning method is used to indicate that the ratio of the total number of LED beads in the LED display unit to the number of simultaneously lit LED beads is 1 / target quantity.

2. The method according to claim 1, characterized in that, the determining the target quantity includes: Determine the target quantity according to the setting status of the resistance between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit.

3. The method according to claim 2, characterized in that, the determining the target quantity according to the setting status of the resistance between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit includes: When there is no resistance set between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit, determine the target quantity as n, and different LED bead arrays in the same column correspond to different column drivers; When a resistance is set between the corresponding columns of two adjacent LED bead arrays among the C×D LED bead arrays, determine the target quantity as C multiplied by n, and each LED bead array in the same column corresponds to the same column driver.

4. The method according to claim 2, characterized in that, the determining the target quantity according to the setting status of the resistance between the corresponding columns of every two adjacent LED bead arrays in the same column of the LED display unit includes: Divide the LED bead arrays in the same column of the display unit into p groups on average, with q LED bead arrays in each group; When a resistance is set between the corresponding columns of the q LED bead arrays belonging to the same group and no resistance is set between two adjacent groups of LED bead arrays, determine the target quantity as q multiplied by n, and each LED bead array belonging to the same group corresponds to the same column driver.

5. The method according to claim 4, characterized in that, the q = 2.

6. The method according to any one of claims 1 to 5, characterized in that, after determining the scanning method according to the target quantity, it further includes: According to the target quantity, determine the driving signals of the row drivers of the LED display unit and the driving signals of the column drivers of the LED display unit.

7. The method according to any one of claims 1 to 5, characterized in that, The first electrode is the positive electrode of the LED lamp bead, and the second electrode is the negative electrode of the LED lamp bead; Or, The first electrode is the negative electrode of the LED lamp bead, and the second electrode is the positive electrode of the LED lamp bead.

8. A scanning device, Characterized in that, Comprising: A processing module for determining a target quantity, where the target quantity is the number of LED lamp beads controlled by the same column driver among the LED lamp beads in the same column of the LED display unit. The LED display unit includes C×D LED lamp bead arrays, each LED lamp bead array includes n rows and m columns of LED lamp beads. In each LED lamp bead array, the first electrodes of the LED lamp beads in the same row are connected to the same output terminal of the row driver, and the second electrodes of the LED lamp beads in the same column are connected to the same output terminal of the column driver. The LED lamp beads in the same column of the LED display unit include C×n LED lamp beads; A determining module for determining a scanning method according to the target quantity, where the scanning method is used to indicate that the ratio of the total number of LED lamp beads in the LED display unit to the number of simultaneously lit LED lamp beads is 1 / target quantity.

9. An LED display unit, Characterized in that, Comprising: C×D LED lamp bead arrays, each LED lamp bead array includes n rows and m columns of LED lamp beads. In each LED lamp bead array, the first electrodes of the LED lamp beads in the same row are connected to the same output terminal of the row driver, and the second electrodes of the LED lamp beads in the same column are connected to the same output terminal of the column driver. The LED lamp beads in the same column of the LED display unit include C×n LED lamp beads; A processor, a memory, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method according to any one of claims 1 to 7.

10. The LED display unit according to claim 9, Characterized in that, When the LED lamp bead arrays in the same column are evenly divided into p groups, with q LED lamp bead arrays in each group, resistors are provided between the corresponding columns of the q LED lamp bead arrays belonging to the same group, and no resistor is provided between adjacent groups of LED lamp bead arrays, each group of LED lamp bead arrays has its own column driver, and the column driver of any group of LED lamp bead arrays is located in the middle position.

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