LED display device and driving method, device and LED driving chip thereof

Abstract

The present application is applicable to the field of LED display technology, and provides an LED display device and a driving method, device, and LED driver chip thereof, wherein the driving method of the LED display device includes: receiving a row scanning signal corresponding to data to be displayed, and counting the received row scanning signal corresponding to the data to be displayed; if the current count value of the row scanning signal corresponding to the data to be displayed matches the row number range of a preset row in a display screen to be driven by the LED driver chip, determining a target row driving signal based on a target row scanning signal corresponding to the current count value; the target row driving signal is used to display and drive the pixel unit of the target row in the display screen targeted by the target row scanning signal; and sending the target row driving signal to the display screen, thereby expanding the application scope of the LED driver chip and improving the scalability of the LED driver chip.

Description

Technical Field

[0001] The present application relates to the field of LED display technology, and in particular to an LED display device and a driving method and device thereof, and an LED driving chip. Background Art

[0002] In recent years, LED display screens that use light emitting diodes (LEDs) as pixel units have rapidly developed into mainstream products in the field of information display due to their advantages of high reliability, long service life, high cost performance and low cost. Generally, each pixel unit of an LED display screen may include at least one LED. When an image is displayed through an LED display screen, it is necessary to drive the respective LEDs included in the corresponding pixel units in the LED display screen according to the pixel information of each pixel unit in the image, and to make each pixel unit present a corresponding color by controlling the brightness of each LED in each pixel unit. Therefore, a driving device for display driving an LED display screen usually needs to include: a row driving chip for display driving each row of pixel units of the LED display screen and a constant current driving chip for display driving the LEDs in each pixel unit.

[0003] In order to adapt to the miniaturization of LED display devices, the prior art usually integrates the row driver chip and the constant current driver chip in the driver device into the same LED driver chip. However, the number of row driver channels included in the traditional LED driver chip is equal to the number of rows of pixel units included in the display screen to be driven by it. Each row driver channel of the LED driver chip is used to fixedly drive a row of pixel units in the display screen, which will cause the LED driver chip to be only applicable to display screens with the same number of pixel unit rows as the number of row driver channels of the LED driver chip, thereby narrowing the scope of application of the LED driver chip and reducing the scalability of the LED driver chip. Summary of the invention

[0004] In view of this, the embodiments of the present application provide an LED display device and a driving method, apparatus, and LED driver chip thereof to solve the technical problems of the small application range and low scalability of existing LED driver chips.

[0005] A first aspect of an embodiment of the present application provides a driving method for an LED display device, which is applied to an LED driving chip in a driving device of the LED display device. The driving method includes:

[0006] Receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signals corresponding to the data to be displayed;

[0007] If the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset row in the display screen to be driven by the LED driver chip, a target row drive signal is determined according to the target row scan signal corresponding to the current count value; the target row drive signal is used to display and drive the pixel unit of the target row in the display screen targeted by the target row scan signal;

[0008] The target row driving signal is sent to the display screen.

[0009] A second aspect of the embodiments of the present application provides an LED driver chip, including:

[0010] A first counting unit, used for receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signal corresponding to the data to be displayed;

[0011] A row signal processing unit, configured to determine a target row drive signal according to a target row scan signal corresponding to the current count value if the current count value of the row scan signal corresponding to the data to be displayed matches a row number range of a preset row in the display screen to be driven by the LED driver chip; the target row drive signal is used to perform display driving on a pixel unit of a target row in the display screen targeted by the target row scan signal;

[0012] The row signal output unit is used to send the target row driving signal to the display screen.

[0013] A third aspect of an embodiment of the present application provides an LED driver chip, comprising a memory, a processor, and a computer program stored in the memory and executable on the driver chip of the display screen, wherein the processor implements the steps of the driving method described in the first aspect when executing the computer program.

[0014] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the driving method described in the first aspect are implemented.

[0015] A fifth aspect of the embodiments of the present application provides a computer program product. When the computer program product runs on a driver chip of a display screen, the driver chip of the display screen executes the steps of the driving method described in the first aspect above.

[0016] The sixth aspect of the embodiments of the present application provides a driving device for an LED display device, which is used to drive the display screen of the LED display device, and the driving device includes M LED driving chips, each of which is used to execute the steps of the driving method described in the first aspect above.

[0017] A seventh aspect of the embodiments of the present application provides an LED display device, comprising a display screen and the driving device described in the sixth aspect; the driving device is connected to the display screen.

[0018] The LED display device and its driving method, device, LED driver chip, computer-readable storage medium and computer program product provided by the embodiments of the present application have the following beneficial effects:

[0019] The embodiment of the present application provides a driving method for an LED display device. When each LED driver chip in the driving device receives a row scan signal corresponding to data to be displayed, it counts the received row scan signal corresponding to the data to be displayed; and when the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, the corresponding target row drive signal is determined according to the target row scan signal corresponding to the current count value of the row scan signal; and the target row drive signal is sent to the display screen of the LED display device. Therefore, by setting a plurality of LED driver chips and configuring the row number range of the preset rows in the display screen to be driven by each LED driver chip, the plurality of LED driver chips can jointly complete the driving of the display screen whose number of pixel unit rows is greater than the number of row drive channels of the LED driver chip; or only by setting one LED driver chip to complete the driving of the display screen whose number of pixel unit rows is not greater than the number of row drive channels of the LED driver chip, that is, no matter how many rows of pixel units the display screen includes, the display drive of the display screen can be realized by the LED driver chip provided by the embodiment of the present application, thereby expanding the application scope of the LED driver chip and improving the scalability of the LED driver chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of the structure of a driving device for an LED display device provided in an embodiment of the present application;

[0022] Figure 2 A flowchart of a driving method for an LED display device provided in an embodiment of the present application;

[0023] Figure 3A specific implementation flow chart of S22 in a driving method for an LED display device provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of an LED driver chip provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of an LED driver chip provided in another embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of an LED display device provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the states of each LED driver chip in a process of driving a display screen to display data to be displayed by an LED driver device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] As a commonly used light-emitting device, light emitting diode (LED) has been widely used in the field of information display. In recent years, LED display screens using LED as pixel units have rapidly developed into mainstream products in the field of information display due to their advantages of high reliability, long service life, strong environmental adaptability, high cost performance and low cost. Generally, each pixel unit of an LED display screen may include at least one LED. For example, each pixel unit of a color LED display screen may include a group of three primary color LEDs (i.e., three LEDs, namely: red LED, green LED and blue LED).

[0030] When an image is displayed through an LED display screen, it is necessary to drive the LEDs included in the corresponding pixel units in the LED display screen according to the pixel information of each pixel unit in the image, and to make each pixel unit present a corresponding color by controlling the brightness of each LED in each pixel unit. Therefore, the driving device for display driving of the LED display screen usually needs to include: a row driving chip for display driving of each row of pixel units of the LED display screen and a constant current driving chip (i.e., a column driving chip) for display driving of the LEDs in each pixel unit.

[0031] Generally, LED display screens can be divided into static display screens and dynamic display screens according to the different driving modes of the LED display screens. The driving mode of the static display screen is to drive all the rows of pixel units included in the display screen simultaneously, that is, to drive all the rows of pixel units in the display screen at the same time; the driving mode of the dynamic display screen is to drive each row of pixel units included in the display screen row by row, that is, to drive only one row of pixel units in the display screen at one time, and then drive the next row of pixel units in the display screen at the next time, until a frame of image is displayed. Due to the difference in driving mode between static display screens and dynamic display screens, the driving device of the dynamic display screen requires fewer driving chips than the driving device of the static display screen, which is more conducive to the miniaturization design of LED display devices.

[0032] In the driving device of the traditional dynamic display screen, the row driver chip and the constant current driver chip are independently arranged, which requires more driver chips in the driving device. For example, for a display screen including 64×64 pixel units, the driving device needs to include 8 row driver chips with 8 channels and 12 (4 for each of the red LED, green LED and blue LED) 16-channel constant current driver chips, a total of 20 driver chips. The types and quantities of chips are large, which not only increases the wiring complexity of the driver chip in the driving device, but also leads to a larger size of the driving device.

[0033] In order to adapt to the miniaturization of LED display devices and reduce the wiring complexity of the driver chip in the driver device of the LED display device, an improved solution is to integrate the row driver chip and the constant current driver chip in the driver device into the same LED driver chip. For example, 48 constant current drive channels (16 for each of the red LED, green LED and blue LED) and 64 row drive channels are integrated in one LED driver chip. In this way, for a display screen including 64×64 pixel units, only 4 LED driver chips are needed, which can greatly reduce the number of driver chips in the driver device, thereby reducing the wiring complexity of the driver chip in the driver device and reducing the size of the driver device.

[0034] However, the number of row drive channels included in a traditional integrated LED driver chip is usually designed based on the number of rows of pixel units included in the display screen to be driven, that is, the number of row drive channels included in a traditional LED driver chip is equal to the number of rows of pixel units included in the display screen to be driven, and each row drive channel of the LED driver chip is used to fixedly drive a row of pixel units in the display screen. This will cause the LED driver chip to be only applicable to display screens with the same number of pixel unit rows as the number of row drive channels of the LED driver chip, thereby narrowing the scope of application of the LED driver chip and reducing the scalability of the LED driver chip.

[0035] The embodiment of the present application first provides a driving device for an LED display device, the driving device is used to connect the display screen of the LED display device and drive the display screen of the LED display device. The display screen of the LED display device can be composed of R×C pixel units, each pixel unit can include at least one LED, and R and C are both positive integers. Exemplarily, each pixel unit can include a group of three primary color LEDs (i.e., three LEDs, namely: red LED, green LED and blue LED).

[0036] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a driving device for an LED display device provided in an embodiment of the present application. Figure 1 As shown, the driving device 10 of the LED display device (hereinafter referred to as the driving device 10) may include M LED driving chips, namely: LED driving chip 11 to LED driving chip 1M. The input ends of the LED driving chips may be connected together as the signal input end of the driving device 10, and the signal input end of the driving device 10 is used to receive information related to the data to be displayed, for example, to receive a row scanning signal corresponding to the data to be displayed.

[0037] Specifically, each LED driver chip may include n row drive channels, namely: row drive channel Row-1 to row drive channel Row-n. The row drive channel is used to output a row drive signal corresponding to the row scan signal, and the row drive signal is used to perform display drive on each pixel unit of the target row in the display screen to which it is directed. n is a positive integer, and the value of n can be set according to actual needs. For example, n can be 16, that is, each LED driver chip can include 16 row drive channels.

[0038] Each LED driver chip may further include m groups of column drive channels. The column drive channel is used to output a column drive signal, and the column drive signal is used to display and drive the target pixel unit of the target column in the display screen to which it is directed. m is a positive integer, and the value of m can be set according to actual needs. For example, m can be 16, that is, each LED driver chip can include 16 groups of column drive channels.

[0039] In a specific application, each group of column drive channels may include at least one column drive channel, and the number of column drive channels included in each group of column drive channels may be set according to actual needs. Exemplarily, when each pixel unit of the display screen includes a red LED, a green LED, and a blue LED, each group of column drive channels may include three column drive channels, namely: a red LED drive channel Ri, a green LED drive channel Gi, and a blue LED drive channel Bi, that is, each LED driver chip may include 3×m column drive channels, where 1≤i≤m, and i is an integer.

[0040] In the embodiment of the present application, the number M of LED driver chips included in the driving device 10 can be determined based on the number R of rows of pixel units included in the display screen of the LED display device, the number n of row drive channels included in the LED driver chip, the number C of columns of pixel units included in the display screen of the LED display device, and the number m of groups of column drive channels included in the LED driver chip.

[0041] In a possible implementation, when MOD(R / n)=0 and MOD(C / m)=0, if INT(R / n)≥INT(C / m), then M=INT(R / n); if INT(R / n)≤INT(C / m), then M=INT(C / m). INT() is an integer operation, and MOD() is a remainder operation.

[0042] In another possible implementation, when MOD(R / n)=0 and MOD(C / m)≠0, if INT(R / n)≥INT(C / m)+1, it can be determined that M=INT(R / n); if INT(R / n)≤INT(C / m)+1, it can be determined that M=INT(C / m)+1.

[0043] In another possible implementation, when MOD(R / n)≠0 and MOD(C / m)=0, if INT(R / n)+1≥INT(C / m), then it can be determined that M=INT(R / n)+1; if INT(R / n)+1≤INT(C / m), then it can be determined that M=INT(C / m).

[0044] In another possible implementation, when MOD(R / n)≠0 and MOD(C / m)≠0, if INT(R / n)+1≥INT(C / m)+1, it can be determined that M=INT(R / n)+1; if INT(R / n)+1≤INT(C / m)+1, it can be determined that M=INT(C / m)+1.

[0045] In the embodiment of the present application, since the driving device 10 includes M LED driving chips, and each LED driving chip includes n row driving channels, each LED driving chip can be used to display drive n rows of pixel units in the display screen, and different LED driving chips can be used to display drive different n rows of pixel units in the display screen. Exemplarily, if the display screen includes 32 rows of pixel units, the driving device 10 includes 2 LED driving chips, and each LED driving chip includes 16 row driving channels, then the first LED driving chip in the driving device 10 can be used to display drive the pixel units of the 1st to 16th rows of the display screen; the second LED driving chip in the driving device 10 can be used to display drive the pixel units of the 17th to 32nd rows of the display screen.

[0046] Based on this, before driving the display screen by the driving device 10, it is necessary to first determine the preset rows in the display screen to be driven by each LED driver chip in the driving device 10. The number of preset rows to be driven by each LED driver chip may be less than or equal to the number of row drive channels it includes.

[0047] In a possible implementation, each LED driver chip in the driver 10 may be directly configured with a row number range of a preset row in the display screen to be driven. For example, if the display screen includes 64×64 pixel units, each LED driver chip includes 16 row drive channels and 16 column drive channels, and the driver 10 may include 4 LED driver chips, then the row number ranges of the preset rows in the display screen to be driven by the 4 LED driver chips may be: 1 to 16 (i.e., row 1 to row 16), 17 to 32 (i.e., row 17 to row 32), 33 to 38 (i.e., row 33 to row 48), and 49 to 64 (i.e., row 49 to row 64).

[0048] In a specific application, a row number configuration instruction can be sent to each LED driver chip to configure a row number range of a preset row in a display screen to be driven by each LED driver chip. The row number configuration instruction carries the row number range of the preset row in the display screen to be driven by the LED driver chip. After receiving the row number configuration instruction, the LED driver chip can store the row number range of the preset row carried in the row number configuration instruction for subsequent use in driving the display screen.

[0049] In another possible implementation, instead of directly configuring the row number range of the preset row to be driven for each LED driver chip, a corresponding preset chip number is configured for each LED driver chip based on the number of LED driver chips included in the driver device 10. When the LED driver chip subsequently drives the display screen, it can determine the preset row in the display screen to be driven according to its preset chip number. As an example but not a limitation, the preset chip numbers pre-configured for each LED driver chip in the LED driver device can form an arithmetic progression with a tolerance of 1, wherein the minimum value of the preset chip numbers of each LED driver chip included in the LED driver device can be set according to actual needs. For example, if the display screen includes 64×64 pixel units, each LED driver chip includes 16 row drive channels and 16 column drive channels, then the driver device 10 can include 4 LED driver chips, and the preset chip numbers of the 4 LED driver chips can be 1, 2, 3 and 4, respectively. In this example, the minimum value of the preset chip numbers of each LED driver chip is 1.

[0050] In a specific application, a preset chip number can be configured for each LED driver chip by sending a number configuration instruction to each LED driver chip. The number configuration instruction carries the preset chip number of the LED driver chip. After receiving the number configuration instruction, the LED driver chip can store the preset chip number carried in the number configuration instruction for subsequent use when driving the display screen.

[0051] In another possible implementation, the LED driver chip may be configured with both a preset row number range of rows in the display screen to be driven and a preset chip number. Based on this, the LED driver chip may store its preset chip number in association with the preset row number range of rows in the display screen to be driven. Exemplarily, the row number range of the preset rows in the display screen to be driven by the LED driver chip with the preset chip number 1 can be 1 to 16, that is, the LED driver chip with the preset chip number 1 can be used to drive the pixel units in the 1st to 16th rows in the display screen; the row number range of the preset rows in the display screen to be driven by the LED driver chip with the preset chip number 2 can be 17 to 32, that is, the LED driver chip with the preset chip number 2 can be used to drive the pixel units in the 17th to 32nd rows in the display screen; the row number range of the preset rows in the display screen to be driven by the LED driver chip with the preset chip number 3 can be 33 to 38, that is, the LED driver chip with the preset chip number 3 can be used to drive the pixel units in the 33rd to 48th rows in the display screen; the row number range of the preset rows in the display screen to be driven by the LED driver chip with the preset chip number 4 can be 49 to 64, that is, the LED driver chip with the preset chip number 4 can be used to drive the pixel units in the 49th to 64th rows in the display screen.

[0052] After configuring the preset row number range and / or preset chip number of the display screen to be driven by each driver chip in the driver device 10, each LED driver chip can specifically drive the display screen of the LED display device based on the driving method of the LED display device provided in the embodiment of the present application. The driving method of the LED display device provided in the embodiment of the present application is described in detail below.

[0053] See also Figure 2 , Figure 2 The present invention provides a flowchart of a method for driving an LED display device according to an embodiment of the present invention. The execution subject of the method for driving an LED display device may be Figure 1 Any LED driving chip in the driving device 10 shown in the figure, the driving method is specifically used to drive the dynamic display screen. Figure 2 As shown, the driving method of the LED display device may include S21 to S23, which are described in detail as follows:

[0054] S21: receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signals corresponding to the data to be displayed.

[0055] In a specific application, the data to be displayed may be a video, a dynamic image, or a live image.

[0056] In the embodiment of the present application, the data to be displayed may include at least one frame of an image to be displayed, and each frame of the image to be displayed may correspond to R row scanning signals, that is, the data to be displayed may correspond to f×R row scanning signals in total. Among them, f is the number of frames of the image to be displayed included in the data to be displayed, and R is the number of rows of pixel units included in the display screen driven by the LED driver chip.

[0057] When the data to be displayed needs to be displayed through the display screen, each LED driving chip in the driving device can receive a row scanning signal corresponding to the data to be displayed through its input terminal.

[0058] In one possible implementation, when the LED display device is used as a display component of an electronic device and is integrated with the electronic device, the LED driver chip can receive a row scan signal corresponding to the data to be displayed sent by the processing unit of the electronic device. In another possible implementation, when the LED display device is used as an independent device and is connected to an electronic device, the LED driver chip can receive a row scan signal corresponding to the data to be displayed sent by the electronic device.

[0059] It should be noted that, for a dynamic display screen, since the driving device drives the pixel units of each row of the display screen row by row, the LED driver chip receives the row scanning signal corresponding to the data to be displayed row by row. For example, when the LED driver chip needs to drive the display screen to display a frame of image, the LED driver chip will sequentially receive the row scanning signal corresponding to the pixel units of the first row of the frame of image to the row scanning signal corresponding to the pixel units of the last row.

[0060] In the embodiment of the present application, when the LED driver chip receives the first row scan signal corresponding to a certain data to be displayed, it starts to count the row scan signals corresponding to the data to be displayed, that is, each time the LED driver chip receives a row scan signal corresponding to the data to be displayed, the count value of the row scan signal corresponding to the data to be displayed is increased by 1. Among them, the initial value of the count value of each row scan signal corresponding to the data to be displayed can be 0, that is, when the LED driver chip does not receive any row scan signal corresponding to a certain data to be displayed, the count value of the row scan signal corresponding to the data to be displayed is 0. Exemplarily, if the LED driver chip has currently received 3 row scan signals corresponding to a certain data to be displayed, the current count value of the row scan signal corresponding to the data to be displayed is 3.

[0061] In the embodiment of the present application, each time the LED driver chip receives a row scan signal corresponding to the data to be displayed and adds 1 to the count value of the row scan signal corresponding to the data to be displayed, it is determined whether the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset row of the display screen to be driven by the LED driver chip. The current count value of the row scan signal corresponding to the data to be displayed refers to the count value after the LED driver chip receives a row scan signal of the data to be displayed and adds 1 to the count value of the row scan signal corresponding to the data to be displayed.

[0062] In one embodiment of the present application, the LED driver chip may execute S22 when determining that the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset row of the display screen to be driven by the LED driver chip.

[0063] In another embodiment of the present application, when the LED driver chip determines that the current count value of the row scan signal corresponding to the data to be displayed does not match the row number range of the preset row of the display screen to be driven by the LED driver chip, it may not process the row scan signal it currently receives.

[0064] S22: If the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, determine the target row drive signal according to the target row scan signal corresponding to the current count value.

[0065] In this embodiment, when the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset row to be driven by the LED driver chip, it means that the target row in the display screen targeted by the target row scan signal corresponding to the current count value of the row scan signal is displayed and driven by the LED driver chip.

[0066] Among them, the target row scan signal corresponding to the current count value of the row scan signal corresponding to the data to be displayed refers to: a row scan signal that makes the current count value of the row scan signal corresponding to the data to be displayed the current value. For example, if the LED driver chip receives the third row scan signal corresponding to the data to be displayed, the current count value of the row scan signal corresponding to the data to be displayed is 3, and if the current count value 3 matches the row number range of the preset row to be driven by the LED driver chip, it means that the third row scan signal corresponding to the data to be displayed (that is, the row scan signal that makes the current count value of the row scan signal 3) is driven by the LED driver chip for display.

[0067] In this embodiment, when the LED driver chip determines that the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset row of the display screen to be driven by the LED driver chip, it can decode the target row scan signal corresponding to the current count value, and then obtain the target row drive signal corresponding to the target row scan signal. The target row drive signal is used to display and drive the pixel unit of the target row in the display screen targeted by the target row scan signal. It should be noted that since the process of decoding the row scan signal is a prior art, it will not be described in detail here.

[0068] S23: Sending the target row driving signal to the display screen.

[0069] In the embodiment of the present application, after the LED driver chip obtains the target row drive signal, it can output the target row drive signal to the display screen through its row drive channel to perform display driving on the pixel units of the target row in the display screen targeted by the target row drive signal.

[0070] Since each LED driver chip includes n row drive channels, in a specific implementation of this embodiment, for row drive signals corresponding to different row scan signals that match the row number range of the preset rows to be driven by the LED driver chip, the LED driver chip can output different row drive signals to the display screen through its different row drive channels.

[0071] Based on this, after obtaining the target row drive signal, the LED driver chip can determine the target row drive channel for outputting the target row drive signal according to the current count value of the row scan signal corresponding to the data to be displayed, and output the target row drive signal to the display screen through the target row drive channel.

[0072] For example, if the preset rows in the display screen to be driven by the LED driver chip are rows 1 to 16, then for the row drive signal corresponding to the row scan signal for the 1st row in the display screen, the LED driver chip can output it to the display screen through the 1st row drive channel; for the row drive signal corresponding to the row scan signal for the 1st row in the display screen, the LED driver chip can output it to the display screen through the 2nd row drive channel.

[0073] It can be seen from the above that the driving method of an LED display device provided by the present embodiment is that, when each LED driver chip in the driving device receives a row scan signal corresponding to the data to be displayed, it will count the received row scan signal corresponding to the data to be displayed; and when the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, the corresponding target row drive signal is determined according to the target row scan signal corresponding to the current count value of the row scan signal; and the target row drive signal is sent to the display screen of the LED display device. Therefore, by setting a plurality of LED driver chips, The invention provides a plurality of LED driver chips, and configures a row number range of a preset row in the display screen to be driven by each LED driver chip, so that the plurality of LED driver chips can jointly drive the display screen whose number of rows of pixel units is greater than the number of row driving channels of the LED driver chip; or only one LED driver chip is provided to drive the display screen whose number of rows of pixel units is not greater than the number of row driving channels of the LED driver chip, that is, no matter how many rows of pixel units the display screen includes, the LED driver chip provided by the implementation of the present application can be used to realize the display driving of the display screen, thereby expanding the application scope of the LED driver chip and improving the scalability of the LED driver chip.

[0074] See also Figure 3 , Figure 3 This is a flowchart of a specific implementation of S22 in a driving method of an LED display device provided in another embodiment of the present application. Figure 2 Corresponding to the embodiment, S22 in this embodiment may specifically include S221 to S222, which are described in detail as follows:

[0075] S221: Determine the target chip number of the chip currently used to drive the display screen according to the current count value and the number of row drive channels included in the LED driver chip.

[0076] In this embodiment, since each LED driver chip in the LED driver device is configured with a preset chip number, and the preset chip numbers of the LED driver chips in the LED driver device form an arithmetic progression with a tolerance of 1. Therefore, the LED driver chip can determine the target chip number of the target LED driver chip currently used to drive the display screen according to the current count value of the row scan signal corresponding to the data to be displayed and the number of row drive channels it includes, and then compare the target chip number with its preset chip number, and determine whether the target row in the display screen targeted by the target row scan signal corresponding to the current count value of the row scan signal is driven by the LED driver chip according to the comparison result.

[0077] In a possible implementation of this embodiment, S221 may specifically include the following steps:

[0078] From the beginning of counting the received row scan signal corresponding to the data to be displayed, every time the current count value reaches the sum of an integer multiple of n and 1, the value of the target chip number is increased by 1, and every time the current count value reaches the sum of an integer multiple of R and 1, the value of the target chip number is set to the initial value of the target chip number.

[0079] Among them, n is the number of row driving channels included in the LED driver chip, R is the number of rows of pixel units included in the display screen, and the initial value of the target chip number is the minimum value of the preset chip numbers of the M LED driver chips included in the LED driver device.

[0080] In this implementation, the initial value of the target chip number is equal to the minimum value of the preset chip numbers of the M LED driver chips included in the LED driver device. For example, if the LED driver device includes 4 LED driver chips, the preset chip numbers of the 4 LED driver chips are 1, 2, 3 and 4, that is, the minimum value of the preset chip numbers of the 4 LED driver chips is 0, then the initial value of the target chip number is also 0.

[0081] Specifically, the LED driver chip starts counting the received row scan signals corresponding to the data to be displayed. If the current count value of the row scan signal corresponding to the data to be displayed has not reached the sum of an integer multiple of n and 1, the current value of the target chip number is its initial value; when the current count value of the row scan signal corresponding to the data to be displayed reaches n+1 (that is, the sum of 1 times n and 1), the LED driver chip will add 1 to the value of the target chip number. At this time, the value of the target chip number is the sum of its initial value and 1; when the current count value of the row scan signal corresponding to the data to be displayed reaches 2n+1 (that is, the sum of 2 times n and 1), the LED driver chip will add 1 to the value of the target chip number. At this time, the value of the target chip number is the sum of its initial value and 2, and so on.

[0082] It should be noted that when the data to be displayed includes multiple frames of images to be displayed, since the various LED driver chips included in the LED driver device need to drive the display screen to display each frame of the image to be displayed respectively, and each LED driver chip continuously counts the row scan signals corresponding to all the images to be displayed included in the data to be displayed, rather than separately counting the row scan signals corresponding to each frame of the image to be displayed. Therefore, in order to enable each LED driver chip to drive the display screen to correctly display each frame of the image to be displayed, the LED driver chip needs to set the value of the target chip number to its initial value when the current count value of the row scan signal corresponding to the data to be displayed reaches the sum of an integer multiple of R and 1.

[0083] For example, if the display screen includes 64 rows of pixel units, each LED driver chip includes 16 row drive channels, and the LED driver device includes 4 LED driver chips, and the preset chip numbers of the 4 LED driver chips are 1, 2, 3 and 4 respectively, then the initial value of the target chip number is 1. When the current count value of the row scan signal corresponding to the data to be displayed does not reach 17 (i.e., 16+1), the value of the target chip number is its initial value 1, and the LED driver chip with the preset chip number 1 processes the target row scan signal corresponding to the current count value; when the current count value of the row scan signal corresponding to the data to be displayed reaches 17, the LED driver chip will add 1 to the value of the target chip number, so that the value of the target chip number is 2, and the LED driver chip with the preset chip number 2 processes the target row scan signal corresponding to the current count value. When the current count value of the row scan signal corresponding to the data to be displayed reaches 65 (i.e. 64+1), the target row scan signal corresponding to the current count value is the row scan signal corresponding to the first row of the second frame of the image to be displayed. Therefore, the LED driver chip will reset the value of the target chip number to 1. At this time, the LED driver chip with the preset chip number 1 will process the target row scan signal corresponding to the current count value, and so on, until all row scan signals corresponding to the data to be displayed are processed.

[0084] In this implementation, since the current target chip number is determined by counting, complex software programming is not required, which can save software programming costs.

[0085] In another possible implementation of this embodiment, S221 may further include the following steps:

[0086] The target chip number is determined according to the following formula:

[0087]

[0088] Among them, A g is the target chip number, INT() is a rounding operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A min is the minimum value among the preset chip numbers of the M LED driver chips.

[0089] In this implementation, the LED driver chip can directly use formula (1) to calculate the target chip number according to the current count value of the row scan signal corresponding to the data to be displayed, the number of row drive channels included in the LED driver chip, and the number of rows of pixel units included in the display screen.

[0090] For example, if the display screen includes 64 rows of pixel units, each LED driver chip includes 16 row drive channels, the LED driver device includes 4 LED driver chips, and the preset chip numbers of the 4 LED driver chips are 1, 2, 3 and 4 respectively, then the initial value of the target chip number is 1. When the current count value of the row scan signal corresponding to the data to be displayed is 65, the value of the target chip number calculated according to formula (1) is 1, so at this time, the LED driver chip with the preset chip number 1 processes the target row scan signal corresponding to the current count value.

[0091] In this implementation, the LED driver chip directly uses a preset formula to determine the current target chip number without using a counting method to determine the current target chip number, which can save the number of counters in the LED driver chip and reduce the hardware cost of the LED chip.

[0092] S222: If the target chip number is the same as the preset chip number of the LED driver chip, determine that the current count value matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, and determine the target row drive signal according to the target row scan signal corresponding to the current count value.

[0093] In this embodiment, when the target chip number determined by the LED driver chip is the same as the preset chip number of the LED driver chip, it means that the target row in the display screen targeted by the target row scan signal corresponding to the current count value of the row scan signal is displayed and driven by the LED driver chip. Therefore, at this time, the LED driver chip can determine the target row drive signal according to the target row scan signal corresponding to the current count value of the row scan signal.

[0094] It can be seen from the above that the present embodiment configures a preset chip number for each LED driver chip so that each LED driver chip can directly determine whether the target row scan signal corresponding to the current count value is processed by the LED driver chip according to the current count value of the row scan signal corresponding to the data to be displayed and the preset chip number of the LED driver chip. This can not only improve the driving efficiency of the LED driver chip for the display screen, but also the LED driver chip only needs to store its preset chip number without storing the row number range of the preset rows in the display screen to be driven, thereby saving the storage space of the LED driver device.

[0095] In another embodiment of the present application, since each LED driver chip can output different row drive signals to the display screen through its different drive channels, in order to facilitate the LED driver chip to accurately determine which row drive channel to use to output the row drive signal, the channel numbers corresponding to each row drive channel of the LED driver chip can be pre-configured. Exemplarily, the channel numbers of the n row drive channels of the LED driver chip can be 0 to n, respectively. More specifically, the channel numbers of the 1st row drive channel to the n-1th row drive channel can be 1 to n-1, respectively, and the channel number of the nth row drive channel can be 0. Based on this, S23 can specifically include the following steps:

[0096] The channel number of the target row driving channel for outputting the target row driving signal is determined according to the following formula:

[0097]

[0098] Among them, R g is the channel number of the target row drive channel, MOD() is a modulo operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A p is a preset chip number of the LED driver chip;

[0099] The target row driving signal is sent to the display screen through the target row driving channel.

[0100] In this embodiment, after the LED driver chip determines that the current count value of the row scanning signal matches the row number range of the preset rows in the display screen to be driven by it, the channel number of the target row driving channel for outputting the target row driving signal can be calculated using formula (2) according to the current count value of the row scanning signal, the number of rows of pixel units included in the display screen, the number of row driving channels included in the LED driver chip, and the preset chip number of the LED driver chip, and the target row driving signal is output to the display screen of the LED display device through the target row driving channel.

[0101] For example, if the display screen includes 64 rows of pixel units, the LED driving device includes 4 LED driving chips, the preset chip numbers of the 4 LED driving chips are 1, 2, 3 and 4 respectively, and each LED driving chip includes 16 row driving channels. Then, when the current count value of the row scanning signal corresponding to the data to be displayed is 33, each LED driving chip can calculate the target chip number as 3 through formula (1), that is, the target row driving signal corresponding to the current count value of the row scanning signal needs to be output by the LED driving chip with the preset chip number 3, and the LED driving chip with the preset chip number 3 can calculate the channel number of the target row driving channel as 1 through formula (2), that is, the LED driving chip with the preset chip number 3 can output the target row driving signal to the display screen through its row driving channel with the channel number 1.

[0102] This embodiment uses a preset formula to determine the target row drive channel for outputting the target row drive signal, so that the LED driver chip can accurately output the target row drive channel through the target row drive channel corresponding to the target row drive signal, thereby improving the accuracy of the LED driver device when driving the display screen.

[0103] The following is a detailed description of the driving method of the LED display device provided in the embodiment of the present application through a specific example:

[0104] For example, if the display screen of the LED display device includes 64×64 pixel units, each LED driver chip includes 16 row drive channels, and the LED driver device may include 4 LED driver chips. If the preset chip numbers Addr1 of the 4 LED driver chips are 1, 2, 3 and 4 respectively, then the state of each LED driver chip in the process of driving the display screen to display the data to be displayed by the LED driver device may be as follows: Figure 7 shown.

[0105] Among them, the row drive signals corresponding to the 1st row scan signal to the 16th row scan signal of each frame of the image to be displayed are respectively output to the display screen by the 1st row drive channel to the 16th row drive channel of the 1st LED driver chip; the row drive signals corresponding to the 17th row scan signal to the 32nd row scan signal of each frame of the image to be displayed are respectively output to the display screen by the 1st row drive channel to the 16th row drive channel of the 2nd LED driver chip; the row drive signals corresponding to the 33rd row scan signal to the 48th row scan signal of each frame of the image to be displayed are respectively output to the display screen by the 1st row drive channel to the 16th row drive channel of the 3rd LED driver chip; the row drive signals corresponding to the 49th row scan signal to the 64th row scan signal of each frame of the image to be displayed are respectively output to the display screen by the 1st row drive channel to the 16th row drive channel of the 4th LED driver chip.

[0106] See also Figure 4 , Figure 4 FIG. 4 is a schematic diagram of a structure of an LED driver chip provided in an embodiment of the present application. The LED driver chip 40 includes units for executing Figure 2 or Figure 3 For details of the steps in the corresponding embodiments, please refer to Figure 2 or Figure 3 as well as Figure 2 or Figure 3 For the convenience of explanation, only the parts related to this embodiment are shown. Figure 4 As shown, the LED driver chip 40 includes: a first counting unit 41, a row signal processing unit 42 and a row signal output unit 43. Among them:

[0107] The first counting unit 41 is used for receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signal corresponding to the data to be displayed.

[0108] The row signal processing unit 42 is used to determine the target row drive signal according to the target row scan signal corresponding to the current count value if the current count value of the row scan signal corresponding to the data to be displayed matches the row number range of the preset rows in the display screen to be driven by the LED driver chip; the target row drive signal is used to display the pixel unit of the target row in the display screen targeted by the target row scan signal.

[0109] The row signal output unit 43 is used to send the target row driving signal to the display screen.

[0110] Optionally, the row signal processing unit 42 may include: a first determining unit and a second determining unit.

[0111] The first determining unit determines the target chip number of the chip currently used for display driving the display screen according to the current count value and the number of row driving channels included in the LED driving chip.

[0112] The second determination unit is used to determine that if the target chip number is the same as the preset chip number of the LED driver chip, the current count value matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, and determine the target row drive signal according to the target row scan signal corresponding to the current count value.

[0113] Optionally, the first determining unit is specifically configured to:

[0114] From the beginning of counting the received row scan signal corresponding to the to-be-displayed data, the value of the target chip number is increased by 1 each time the current count value reaches the sum of an integer multiple of n and 1, and the value of the target chip number is set to the initial value of the target chip number each time the current count value reaches the sum of an integer multiple of R and 1;

[0115] Among them, n is the number of row driving channels included in the LED driver chip, R is the number of rows of pixel units included in the display screen, and the initial value of the target chip number is the minimum value among the preset chip numbers of the M LED driver chips.

[0116] Optionally, the first determining unit is specifically configured to:

[0117] The target chip number is determined according to the following formula:

[0118]

[0119] Among them, A g is the target chip number, INT() is a rounding operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A min is the minimum value among the preset chip numbers of the M LED driver chips.

[0120] Optionally, the first determining unit is specifically configured to:

[0121] The channel number of the target row driving channel for outputting the target row driving signal is determined according to the following formula:

[0122]

[0123] Among them, R gis the channel number of the target row drive channel, MOD() is a modulo operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A p is a preset chip number of the LED driver chip;

[0124] The target row driving signal is sent to the display screen through the target row driving channel.

[0125] It should be noted that the information interaction, execution process and other contents between the above-mentioned units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be specifically referred to the method embodiment part and will not be repeated here.

[0126] Figure 5 This is a schematic diagram of the structure of an LED driver chip provided by another embodiment of the present application. Figure 5 As shown, the LED driver chip 50 includes: a processor 51, a memory 52, and a computer program 53 stored in the memory 52 and executable on the processor 51, such as a program corresponding to the driving method of the LED display device. When the processor 51 executes the computer program 53, the steps in the above-mentioned driving method embodiments of the LED display device are implemented, such as Figure 2 Alternatively, the processor 51 executes the computer program 53 to implement the above Figure 4 The functions of each unit in the corresponding embodiment are, for example, Figure 4 For details on the functions of the units 41 to 43 shown, please refer to Figure 4 The relevant descriptions in the corresponding embodiments are not repeated here.

[0127] Exemplarily, the computer program 53 may be divided into one or more units, which are stored in the memory 52 and executed by the processor 51 to complete the present application. The one or more units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 53 in the LED driver chip 50. For example, the computer program 53 may be divided into a first counting unit, a row signal processing unit, and a row signal output unit, and the specific functions of each unit are as described above.

[0128] Those skilled in the art will understand that Figure 5 It is only an example of the LED driver chip 50 and does not constitute a limitation of the LED driver chip 50. The LED driver chip 50 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the LED driver chip 50 may also include input and output devices, network access devices, buses, etc.

[0129] The processor 51 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0130] The memory 52 may be an internal storage unit of the LED driver chip 50, such as a hard disk or memory of the LED driver chip 50. The memory 52 may also be an external storage device of the LED driver chip 50, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the LED driver chip 50. Further, the memory 52 may also include both an internal storage unit of the LED driver chip 50 and an external storage device. The memory 52 is used to store the computer program and other programs and data required by the LED driver chip 50. The memory 52 may also be used to temporarily store data that has been output or is to be output.

[0131] The present application also provides an LED display device. Figure 6 , Figure 6 Schematic diagram of the structure of an LED display device provided in an embodiment of the present application. The LED display device 60 includes a display screen 61 and a driving device 62, and the driving device 62 is connected to the display screen 61. The driving device 62 can be Figure 4 or Figure 5 The drive device shown.

[0132] The present application also provides a computer-readable storage medium in which a computer program is stored. When the computer program is executed by a processor, the above-mentioned Figure 2 or Figure 3 The corresponding steps in the driving method of the LED display device in the embodiment.

[0133] The embodiment of the present application also provides a computer program product, when the computer program product is run on the LED driver chip, the LED driver chip executes Figure 2The corresponding steps in the driving method of the LED display device in the embodiment.

[0134] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0135] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A driving method for an LED display device, characterized in that: The LED driving chip used in the driving device of the LED display device, the driving method includes: Receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signals corresponding to the data to be displayed; Determine the target chip number of the chip currently used to drive the display screen of the LED display device according to the current count value of the row scan signal corresponding to the data to be displayed and the number of row drive channels included in the LED driver chip; If the target chip number is the same as the preset chip number of the LED driver chip, it is determined that the current count value matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, and the target row drive signal is determined according to the target row scan signal corresponding to the current count value; The target row driving signal is sent to the display screen.

2. The driving method according to claim 1, characterized in that: The driving device includes M LED driving chips, the preset chip numbers of the M LED driving chips form an arithmetic progression with a tolerance of 1, and M is a positive integer; correspondingly, determining the target chip number of the chip currently used to drive the display screen according to the current count value and the number of row driving channels included in the LED driving chip, includes: From the beginning of counting the received row scan signal corresponding to the to-be-displayed data, the value of the target chip number is increased by 1 each time the current count value reaches the sum of an integer multiple of n and 1, and the value of the target chip number is set to the initial value of the target chip number each time the current count value reaches the sum of an integer multiple of R and 1; Among them, n is the number of row driving channels included in the LED driver chip, R is the number of rows of pixel units included in the display screen, and the initial value of the target chip number is the minimum value among the preset chip numbers of the M LED driver chips.

3. The driving method according to claim 1, characterized in that: The driving device includes M LED driving chips, the preset chip numbers of the M LED driving chips form an arithmetic progression with a tolerance of 1, and M is a positive integer; correspondingly, determining the target chip number of the chip currently used to drive the display screen according to the current count value and the number of row driving channels included in the LED driving chip, includes: The target chip number is determined according to the following formula: Among them, A g is the target chip number, INT() is a rounding operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A min is the minimum value among the preset chip numbers of the M LED driver chips.

4. The driving method according to any one of claims 1 to 3, characterized in that: The LED driver chip includes n row drive channels, and the channel numbers of the n row drive channels are 0 to n-1, where n is a positive integer; Correspondingly, sending the target row driving signal to the display screen includes: The channel number of the target row driving channel for outputting the target row driving signal is determined according to the following formula: Among them, R g is the channel number of the target row drive channel, MOD() is a modulo operation, Q is the current count value, R is the number of rows of pixel units included in the display screen, n is the number of row drive channels included in the LED driver chip, A p is a preset chip number of the LED driver chip; The target row driving signal is sent to the display screen through the target row driving channel.

5. An LED driver chip, characterized in that: include: A first counting unit, used for receiving a row scanning signal corresponding to the data to be displayed, and counting the received row scanning signal corresponding to the data to be displayed; A row signal processing unit, used to determine the target chip number of the chip currently used to drive the display screen of the LED display device according to the current count value of the row scanning signal corresponding to the data to be displayed and the number of row driving channels included in the LED driving chip; If the target chip number is the same as the preset chip number of the LED driver chip, it is determined that the current count value matches the row number range of the preset rows in the display screen to be driven by the LED driver chip, and the target row drive signal is determined according to the target row scan signal corresponding to the current count value; The row signal output unit is used to send the target row driving signal to the display screen.

6. An LED driver chip, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the driving method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the driving method according to any one of claims 1 to 4 are implemented.

8. A driving device for an LED display device, used for driving a display screen of the LED display device, characterized in that: The driving device comprises M LED driving chips, each of which is used to execute the steps of the driving method according to any one of claims 1 to 4.

9. An LED display device, characterized in that: include: A display screen and a driving device as claimed in claim 8; The driving device is connected to the display screen.

Images