Display module and LED display screen

Abstract

The application discloses a display module and an LED display screen, and relates to the technical field of display screens.The display module comprises a signal driving chip and multiple groups of display driving chips, the multiple groups of display driving chips have one-to-one correspondence with the colors of lamp beads on the display module, and each group of display driving chips is used for driving the lamp beads of the corresponding color to light up.The signal driving chip stores the basic parameters of the multiple groups of display driving chips respectively, wherein the basic parameters of each group of display driving chips are used for configuring the driving current of the group of display driving chips.The signal driving chip is used for processing the basic parameters of each group of display driving chips according to the received trigger signal or the trigger signal generated in the signal driving chip, so as to output the corresponding first communication signal of each group of display driving chips and make the group of display driving chips generate the driving current.For the application of the display driving chip without external resistance, the application can realize the fixed proportion of the driving current of the different color lamp beads on the display module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen, in particular to a display module and LED display screen. BACKGROUND

[0002] The display area of a full-color LED display screen is composed of numerous pixel points containing LED lamp beads of different colors, and the brightness, wavelength, etc. of each color LED lamp bead determines the display effect of the brightness, white balance, chroma, etc. of the entire LED display screen. A complete LED display screen usually includes a display module, a controller and other components, and the display module is provided with a display driving chip. The display driving chip can generate stable driving current to make the lamp beads on the display module light up. In different display environments, the driving current of the display driving chip needs to be adjusted by the controller.

[0003] Currently, each pixel point in the LED display screen is usually composed of red, green and blue three-color LED lamp beads. Corresponding to the color types of the lamp beads in the pixel points, the display driving chip also has multiple groups. Each group of display driving chips is used to drive the corresponding color lamp beads to light up in the row scanning process. By adjusting the driving current of each group of display driving chips separately, the brightness of the corresponding color lamp beads can be changed.

[0004] Generally, before the display module is shipped, the display screen manufacturer will fix the brightness ratio of the multi-color lamp beads on the display module to achieve better display effect, which is usually realized by fixing the driving current ratio of different color lamp beads. For example, the driving current of the display driving chip used to drive the red lamp beads to light up is Ir, the driving current of the display driving chip used to drive the green lamp beads to light up is Ig, and the driving current of the display driving chip used to drive the blue lamp beads to light up is Ib. By fixing the ratio of Ir, Ig and Ib, the brightness ratio of red, green and blue lamp beads can be fixed.

[0005] In specific applications, the display driving chip commonly used at present generates driving current based on an external resistance installed on the display module. The external resistance is generally configured by the display screen manufacturer, and the external resistance is fixed after the display module is shipped. If the driving current generated by the display driving chip based on the external resistance is called the default driving current, the default driving current that each display driving chip can generate at present is also fixed after the display module is shipped.

[0006] Display manufacturers, through relevant testing processes, can determine the required external resistor values ​​for the display driver chips used to drive different colored LEDs (for example, the external resistor value for the display driver chip driving the red LED is REXT-r, the external resistor value for the display driver chip driving the green LED is REXT-g, and the external resistor value for the display driver chip driving the blue LED is REXT-b). Then, using relevant processes, the corresponding external resistors are soldered onto the display module and connected to the corresponding display driver chips. This fixes the default drive current ratio of multiple display driver chips, thus fixing the drive current ratio of different colored LEDs on the display module, thereby determining display effects such as white balance. Based on this, the controller can directly send current gain to the display driver chip to adjust the default drive current of the display driver chip, causing the display driver chip to output the target drive current.

[0007] However, with the increasing demands for integration, display driver chips that do not require external resistors have been introduced to the market. These chips can generate drive current without relying on external resistors on the display module. Obviously, for display driver chips without external resistors, display manufacturers cannot fix the drive current ratio of multiple display driver chips on the display module by configuring external resistors. In other words, the brightness ratio of the multi-color LEDs on the display module cannot be fixed, resulting in uncontrollable display effects after the display module leaves the factory. Summary of the Invention

[0008] This invention provides a display module and an LED display screen, which are designed for applications using display driver chips without external resistors, to achieve a fixed ratio of driving current for different colored LED beads on the display module.

[0009] To address the aforementioned problems, in a first aspect, embodiments of the present invention disclose a display module, comprising: a signal driving chip and multiple sets of display driving chips, wherein the multiple sets of display driving chips have a one-to-one correspondence with the colors of LEDs on the display module, and each set of display driving chips is used to drive the LEDs of its corresponding color to light up; the signal driving chip stores basic parameters for each set of display driving chips, wherein the basic parameters of each set of display driving chips are used to configure the driving current of that set of display driving chips; the signal driving chip is used to process the basic parameters of each set of display driving chips according to a received trigger signal or a trigger signal generated internally, so as to output a corresponding first communication signal to each set of display driving chips; each set of display driving chips generates a driving current based on the received first communication signal.

[0010] In an embodiment of the present application, the signal driving chip comprises a memory and a plurality of processing modules; the memory is configured to store a plurality of sets of basic parameters of display driving chips; the plurality of processing modules have a one-to-one correspondence with the plurality of sets of display driving chips; each processing module is configured to, after receiving a trigger signal, process the basic parameters of a target set of display driving chips corresponding to the processing module in the memory, and output a first communication signal corresponding to the target set of display driving chips.

[0011] In an embodiment of the present application, each processing module comprises a control submodule and a protocol generation submodule; the control submodule is configured to control reading of the basic parameters of a target set of display driving chips corresponding to the processing module in the memory according to the trigger signal; and the protocol generation submodule is configured to convert the read basic parameters into the first communication signal recognizable by the target set of display driving chips, and output the first communication signal.

[0012] In an embodiment of the present application, each processing module comprises a control submodule, an operation submodule, and a protocol generation submodule; the control submodule is configured to control reading of the basic parameters of a target set of display driving chips corresponding to the processing module in the memory according to the trigger signal; the operation submodule is configured to perform operation on the read basic parameters and a current gain to generate a configuration parameter; the current gain is a data signal received by the signal driving chip and capable of adjusting a driving current of the display driving chip; and the protocol generation submodule is configured to convert the configuration parameter into the first communication signal recognizable by the target set of display driving chips, and output the first communication signal.

[0013] In an embodiment of the present application, the memory is further configured to store a range of configuration parameters of the plurality of sets of display driving chips; each processing module comprises a control submodule, an operation submodule, a judgment submodule, and a protocol generation submodule; the control submodule is configured to control reading of the basic parameters of a target set of display driving chips corresponding to the processing module in the memory according to the trigger signal; the operation submodule is configured to perform operation on the read basic parameters and a current gain to generate a configuration parameter; the current gain is a data signal received by the signal driving chip and capable of adjusting a driving current of the display driving chip; the judgment submodule is configured to judge the configuration parameter output by the operation submodule based on the range of configuration parameters of the target set of display driving chips stored in the memory, and output a target configuration parameter based on a judgment result; and the protocol generation submodule is configured to convert the target configuration parameter into the first communication signal recognizable by the target set of display driving chips, and output the first communication signal.

[0014] In an embodiment of the present application, the memory is further configured to store a current gain range; each processing module comprises a control submodule, a judgment submodule, an operation submodule, and a protocol generation submodule; the control submodule is configured to control reading out of a basic parameter of a display driving chip in a target group in the memory according to a trigger signal; the judgment submodule is configured to judge a received current gain based on the current gain range, and output a target current gain based on a judgment result; wherein the current gain is a data signal received by the signal driving chip and capable of adjusting a driving current of the display driving chip; the operation submodule is configured to perform operation on the read-out basic parameter and the target current gain to generate a configuration parameter; and the protocol generation submodule is configured to convert the configuration parameter into a first communication signal capable of being recognized by the target group of display driving chips, and output the first communication signal.

[0015] In an embodiment of the present application, the signal driving chip further comprises a plurality of data transmission channels, and the plurality of data transmission channels have a one-to-one correspondence with the plurality of groups of display driving chips; wherein the data transmission channel corresponding to each group of display driving chips is configured to push the first communication signal corresponding thereto to the display driving chip.

[0016] In an embodiment of the present application, each data transmission channel is further provided with a selector; the selector is configured to select output of the corresponding first communication signal or output of a second communication signal received by the signal driving chip based on a selection signal.

[0017] In an embodiment of the present application, wherein the color of the lamp beads in the display module comprises red, green, and blue, and the plurality of groups of display driving chips comprise:

[0018] a first group of display driving chips for driving the red lamp beads to light up;

[0019] a second group of display driving chips for driving the green lamp beads to light up;

[0020] a third group of display driving chips for driving the blue lamp beads to light up.

[0021] In a second aspect, an embodiment of the present application discloses an LED display screen, comprising a controller and a display module as described in the embodiment of the present application, and the controller is connected with the plurality of groups of display driving chips through the signal driving chip.

[0022] The embodiment of the present application has the following advantages:

[0023] The embodiment of the present application provides a display module, which comprises a signal driving chip and a plurality of display driving chips, the plurality of display driving chips have one-to-one correspondence with the colors of lamp beads on the display module, each display driving chip is used for driving the lamp bead of the corresponding color to light up, and the signal driving chip stores the basic parameters of the plurality of display driving chips respectively, wherein the basic parameters of each display driving chip are used for configuring the driving current of the display driving chip. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application.

[0025] Figure 1 FIG. 1 is a structural schematic diagram of a display module according to an embodiment of the present application;

[0026] Figure 2 FIG. 2 is a block diagram of a signal driving chip according to an embodiment of the present application;

[0027] Figure 3 FIG. 3 is a structural schematic diagram of a signal driving chip according to an embodiment of the present application;

[0028] Figure 4 FIG. 4 is a structural schematic diagram of a signal driving chip according to another embodiment of the present application;

[0029] Figure 5 FIG. 5 is a structural schematic diagram of a signal driving chip according to still another embodiment of the present application;

[0030] Figure 6 FIG. 6 is a structural schematic diagram of a signal driving chip according to still another embodiment of the present application;

[0031] Figure 7 FIG. 7 is a partial circuit schematic diagram of a signal driving chip according to an embodiment of the present application;

[0032] Figure 8 FIG. 8 is a structural schematic diagram of an LED display screen according to an embodiment of the present application.

[0033] Legend of the drawings:

[0034] 100 - display module, 200 - controller; 10 - signal driving chip, 20 - first group of display driving chips, 30 - second group of display driving chips, 40 - third group of display driving chips;

[0035] 101 - memory, 102 - processing module, 103 - selector; 1021 - control sub-module, 1022 - protocol generation sub-module, 1023 - operation sub-module, 1024 - judgment sub-module. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0037] The display module 100 provided by the embodiment of the present application comprises a signal driving chip 10 and a plurality of groups of display driving chips, and the plurality of groups of display driving chips have a one-to-one correspondence with the colors of the lamp beads on the display module 100. Figure 1 The plurality of groups of display driving chips have a one-to-one correspondence with the colors of the lamp beads on the display module 100, and each group of display driving chips is used to drive the lamp beads of the corresponding color to light up.

[0038] In the embodiment of the present application, each group of display driving chips corresponds to one color of lamp beads on the display module 100, and each group of display driving chips can include one or more cascaded display driving chips, and the display driving chips under the same group are used to drive the lamp beads of the same color to light up. In general applications, one pixel point of a display screen is composed of red, green and blue three-color LED lamp beads, that is, different color lamp beads on the display module 100 include red R_LED, green G_LED and blue B_LED, and correspondingly, the plurality of groups of display driving chips should include: the first group of display driving chips 20 used to drive the red lamp beads to light up, the second group of display driving chips 30 used to drive the green lamp beads to light up, and the third group of display driving chips 40 used to drive the blue lamp beads to light up. It should be noted that in the case that each group of display driving chips is cascaded with a plurality of display driving chips, generally, the first display driving chip is connected with the corresponding data transmission channel to obtain the basic parameters, and the remaining cascaded display driving chips transmit the basic parameters in turn.

[0039] As shown in Figure 1As shown, in the embodiment of the present application, the signal driving chip 10 stores a plurality of sets of basic parameters of the display driving chips respectively, wherein the basic parameters of each set of display driving chips are used to configure the driving current of the display driving chips in the set; the signal driving chip 10 is configured to process the basic parameters of each set of display driving chips according to the received trigger signal or the trigger signal generated therein, so as to output the corresponding first communication signal to each set of display driving chips; each set of display driving chips generates the driving current based on the received first communication signal.

[0040] In the embodiment of the present application, the signal driving chip 10 stores a plurality of sets of basic parameters of the display driving chips respectively, and after each power-on, the signal driving chip 10 can process the basic parameters of each set of display driving chips according to the received trigger signal or the trigger signal generated therein, so as to output the corresponding first communication signal to each set of display driving chips. Obviously, at this time, the first communication signal output to each set of display driving chips is obtained by processing the basic parameters thereof, and therefore, each set of display driving chips can also parse the basic parameters thereof or the data after processing the basic parameters thereof (such as the configuration parameters or target configuration parameters below) from the first communication signal, and the display driving chip can generate the driving current based on the basic parameters thereof or the data after processing the basic parameters thereof.

[0041] The driving current configured by the basic parameters can be understood as the default driving current described above. The display screen manufacturer can determine the default driving current required to be output by each set of display driving chips without external resistance according to the actual display application needs, then calculate the corresponding basic parameters according to the default driving current, and store the basic parameters in the signal driving chip 10. For example, the different color lamp beads on the display module 100 include red, green and blue. The signal driving chip 10 stores three basic parameters, U1, U2 and U3, wherein the basic parameter U1 is used to configure the driving current of the first set of display driving chips 20, the basic parameter U2 is used to configure the driving current of the second set of display driving chips 30, and the basic parameter U3 is used to configure the driving current of the third set of display driving chips 40.

[0042] After the basic parameters of the plurality of display driving chips are written into the signal driving chip 10, the basic parameter proportion between the plurality of display driving chips is fixed, and thus the default driving current proportion of the plurality of display driving chips is also fixed. In this case, no matter whether the first communication signal output by the signal driving chip 10 to each group of display driving chips is directly converted based on the basic parameters or converted based on the data (such as the configuration parameter or the target configuration parameter below) processed based on the basic parameters, the driving current proportion generated by the plurality of display driving chips is consistent with the basic parameter proportion between the plurality of display driving chips, because each group of display driving chips generates driving current (which can be default driving current or target driving current) based on the first communication signal received by the group.

[0043] Thus, for display applications using display driving chips without external resistors, the technical solutions of the embodiments of the present application can fix the driving current proportion of different color lamp beads on the display module at the time of factory shipment, and thus can ensure that the display effect such as white balance of the display module 100 after factory shipment is controllable or consistent with that at the time of factory shipment.

[0044] In the embodiments of the present application, the plurality of display driving chips are connected to the signal driving chip 10 to receive the first communication signal or the second communication signal transmitted by the signal driving chip 10. The connection mode of each group of display driving chips to the signal driving chip 10 can be direct connection or indirect connection through resistors and other components, which is not limited in the present application.

[0045] As to the specific circuit of the display driving chip without external resistors in the present application, the form of the basic parameters in the memory, and the circuit parameters (such as current, voltage or resistance) of the display driving chip adjusted based on the basic parameters, the present application does not make any limitation, and the display driving chip can use the display driving chip available on the market to generate driving current based on the basic parameters or the data processed based on the basic parameters.

[0046] In an embodiment of the present application, referring to Figure 2 , the signal driving chip 10 includes a memory 101 and a plurality of processing modules 102. The memory 101 is used to store the basic parameters of the plurality of display driving chips. The plurality of processing modules 102 have a one-to-one correspondence with the plurality of display driving chips. Each processing module 102 is used to process the basic parameters of the target group of display driving chips corresponding to the processing module 102 in the memory 101 after receiving a trigger signal, to output the first communication signal corresponding to the target group of display driving chips.

[0047] The trigger signal can be received by the signal driving chip 10 or generated in the signal driving chip 10. In one embodiment, the signal driving chip 10 comprises a protocol analysis module (not shown in the figure) configured to analyze the second communication signal received by the signal driving chip 10, and generate the trigger signal when the second communication signal carries an instruction indicating the basic parameter or the configuration parameter or the target configuration parameter described below. In another embodiment, the signal driving chip 10 comprises a protocol analysis module configured to analyze the second communication signal received by the signal driving chip 10 and count certain specific second communication signals until the count exceeds a pre-designed threshold, and generate the trigger signal. In another embodiment, the signal driving chip 10 comprises a power-on reset module configured to generate the trigger signal directly or after a delay after the signal driving chip 10 is powered on. In practice, the trigger signal can also be implemented based on other methods, which are not limited in the present application.

[0048] In the embodiment of the present application, the memory 101 is preferably a non-volatile memory (English: non-volatile memory, abbreviated as NVM) which has the characteristic that the stored data will not be lost when power is off, so as to ensure that after each power-on, the signal driving chip 10 can process the basic parameter of each group of display driving chips according to the received trigger signal or the trigger signal generated in the signal driving chip 10, so as to output the corresponding first communication signal to each group of display driving chips.

[0049] In practical applications, the signal driving chip can first send the basic parameter to the display driving chip, and then send the current gain GAIN to the display driving chip; or the current gain GAIN can be sent to the signal driving chip first, and then the signal driving chip sends the basic parameter and the current gain GAIN to the display driving chip after calculation. Therefore, in the present application, the processing of the basic parameter by each processing module 102 can only be a protocol conversion process, which can be understood as converting the basic parameter into a first communication signal that can be recognized by the target group of display driving chips having a corresponding relationship with the basic parameter, so that the target group of display driving chips can generate a default driving current based on the basic parameter; or it can be a processing including calculation and protocol conversion, such as the processing module 102 calculating the current gain GAIN and the basic parameter and then converting the first communication signal that can be recognized by the target group of display driving chips having a corresponding relationship with the basic parameter, at this time, the target group of display driving chips can generate a target driving current based on the parameters (such as the configuration parameter or the target configuration parameter described below) in the first communication signal.

[0050] Next, some implementable ways of the processing module 102 of the present application will be described by way of example.

[0051] In one embodiment of the present application, with reference to Figure 3Each processing module 102 comprises a control submodule 1021 and a protocol generation submodule 1022. The control submodule 1021 is configured to control reading of the basic parameters of the target group of display driving chips in the memory 101 according to a trigger signal; and the protocol generation submodule 1022 is configured to convert the read basic parameters into first communication signals recognizable by the target group of display driving chips, and output the first communication signals.

[0052] In the embodiment of the present application, the processing of the basic parameters by the processing module 102 can be understood as only a protocol conversion process, i.e., after the first communication signals processed by each processing module 102 are output to the corresponding target group of display driving chips, the target group of display driving chips can obtain the basic parameters by analyzing the first communication signals, and then generate default driving currents based on the basic parameters. Based on the embodiment of the present application, the default driving current proportions of the multiple groups of display driving chips are fixed, and the default driving current proportions of the multiple groups of display driving chips are consistent with the basic parameter proportions of the multiple groups of display driving chips stored in the signal driving chip 10.

[0053] For example, the different color lamp beads on the display module 100 include red, green and blue. The memory 101 stores three basic parameters, U1, U2 and U3. The basic parameter U1 corresponds to the first group of display driving chips 20 for driving the red lamp beads to light up, the first group of display driving chips 20 can obtain the basic parameter U1 by analyzing the first communication signals received thereby, and then configure the default driving current by using the basic parameter U1; the basic parameter U2 corresponds to the second group of display driving chips 30 for driving the green lamp beads to light up, the second group of display driving chips 30 can obtain the basic parameter U2 by analyzing the first communication signals received thereby, and then configure the default driving current by using the basic parameter U2; and the basic parameter U3 corresponds to the third group of display driving chips 40 for driving the blue lamp beads to light up, the third group of display driving chips 40 can obtain the basic parameter U3 by analyzing the first communication signals received thereby, and then configure the default driving current by using the basic parameter U3.

[0054] Subsequently, even if the user sends current gains to the multiple groups of display driving chips through the controller, since the default driving current proportions of the multiple groups of display driving chips have been fixed, and the current gains received by each group of display driving chips are consistent, the target driving current proportions of the multiple groups of display driving chips will remain fixed after each group of display driving chips adjusts the default driving current based on the current gain.

[0055] In another embodiment of the present application, with reference to Figure 4Each processing module 102 comprises a control submodule 1021, an operation submodule 1023 and a protocol generation submodule 1022. The control submodule 1021 is configured to control reading out of the basic parameters of the target group of display driving chips in the memory 101 corresponding to the processing module 102 according to a trigger signal; the operation submodule 1023 is configured to perform operation on the read-out basic parameters and a current gain to generate a configuration parameter; the current gain is a data signal received by the signal driving chip 10 and capable of adjusting the driving current of the display driving chip; and the protocol generation submodule 1022 is configured to convert the configuration parameter into a first communication signal recognizable by the target group of display driving chips and output the first communication signal.

[0056] In the present application, the processing of the basic parameters by the processing module 102 can be understood as an operation + protocol conversion processing. That is, the processing module 102 performs operation on the current gain GAIN and the basic parameters and then converts the operation result into a first communication signal recognizable by the target group of display driving chips corresponding to the processing module 102. At this time, the target group of display driving chips can directly generate a target driving current based on the parameters in the first communication signal (e.g., the configuration parameter or the target configuration parameter described below). Since the basic parameter proportions of the multiple groups of display driving chips have been fixed and the current gain used for calculation is consistent, the proportions of the target driving currents generated finally will also remain fixed, i.e., the proportions of the target driving currents of the multiple groups of display driving chips are consistent with the basic parameter proportions of the multiple groups of display driving chips stored in the signal driving chip 10.

[0057] In another embodiment of the present application, referring to Figure 5 The memory 101 is further configured to store a configuration parameter range of each group of display driving chips; and each processing module 102 comprises a control submodule 1021, an operation submodule 1023, a judgment submodule 1024 and a protocol generation submodule 1022. The control submodule 1021 is configured to control reading out of the basic parameters of the target group of display driving chips in the memory 101 corresponding to the processing module 102 according to a trigger signal; the operation submodule 1023 is configured to perform operation on the read-out basic parameters and a current gain to generate a configuration parameter; the current gain is a data signal received by the signal driving chip 10 and capable of adjusting the driving current of the display driving chip; the judgment submodule 1024 is configured to judge the configuration parameter output by the operation submodule 1023 based on the configuration parameter range of the target group of display driving chips received and output a target configuration parameter based on the judgment result; and the protocol generation submodule 1022 is configured to convert the target configuration parameter into a first communication signal recognizable by the target group of display driving chips and output the first communication signal.

[0058] In the embodiment, the control submodule 1021 can read out the configuration parameter range of the target group of display driving chips in the memory 101 based on the trigger signal or other signals (such as the signal of the operation submodule 1023 generating the configuration parameter); then the judging submodule 1024 is directly or indirectly connected with the memory 101, so as to receive the configuration parameter range of the target group of display driving chips. The embodiment uses the judging submodule 1024 to judge whether the configuration parameter output by the operation submodule 1023 is within the configuration parameter range of the target group of display driving chips, and outputs a first communication signal carrying the target configuration parameter to the target group of display driving chips through the protocol processing submodule, so that the target group of display driving chips generates the target driving current according to the target configuration parameter, which can effectively control the influence of the user's operation on the display screen and the target group of display driving chips, ensure the display effect, and reduce the power consumption of the display driving chips.

[0059] For example, for any group of display driving chips, the configuration parameter is Z, and the configuration parameter range is Z[0:X]; if the judgment result is Z[0]<Z<Z[X], the judging submodule 1024 outputs Z as the target configuration parameter; if the judgment result is Z<Z[0], the judging submodule 1024 outputs Z[0] as the target configuration parameter; if the judgment result is Z[X]<Z, the judging submodule 1024 outputs Z[X] as the target configuration parameter. It should be noted that, since the basic parameters corresponding to different groups of display driving chips are different, the configuration parameter range Z[0:X] corresponding to each group of display driving chips is also different, and the driving current ratio corresponding to the configuration parameter range of different groups should also be fixed, that is, consistent with the fixed basic parameter ratio of the multiple groups of display driving chips.

[0060] In another embodiment of the application, referring to Figure 6 The memory 101 is also used to store a current gain range; each processing module 102 includes a control submodule 1021, a judging submodule 1024, an operation submodule 1023, and a protocol generation submodule 1022. The control submodule 1021 is used to read out the basic parameter of the target group of display driving chips in the memory 101 based on the trigger signal; the judging submodule 1024 judges the received current gain based on the current gain range in the memory 101, and outputs the target current gain based on the judgment result; wherein the current gain is the data signal received by the signal driving chip 10, which can adjust the driving current of the display driving chip; the operation submodule 1023 is used to operate the read-out basic parameter and the target current gain to generate the configuration parameter; and the protocol generation submodule 1022 is used to convert the configuration parameter into a first communication signal that can be recognized by the target group of display driving chips, and output the first communication signal.

[0061] In the embodiment, the control submodule 1021 can control the current gain range reading in the memory 101 based on the trigger signal or other signals (such as the signal of the operation submodule 1023 generating the configuration parameter), and then the judging submodule 1024 is directly or indirectly connected with the memory 101 to receive the current gain range. The embodiment uses the judging submodule 1024 to judge whether the received current gain is within the pre-stored current gain range, and outputs the judged and limited target current gain to the operation submodule 1023, and the operation submodule 1023 generates the configuration parameter based on the target current gain, and outputs a first communication signal carrying the configuration parameter to the target group display driving chip through the protocol processing submodule, and the target group display driving chip generates the target driving current according to the configuration parameter, which can effectively control the influence of the user's operation on the display screen and the target group display driving chip, ensure the display effect, and reduce the power consumption of the display driving chip.

[0062] For example, the current gain is G, and the current gain range is G[0:X]. If the judgment result is G[0]<G<G[X], the judging submodule 1024 outputs G as the target current gain. If the judgment result is G<G[0], the judging submodule 1024 outputs G[0] as the target current gain. If the judgment result is G[X]<G, the judging submodule 1024 outputs G[X] as the target current gain.

[0063] In the embodiment, since the current gain is used to adjust the display effect (such as brightness) of the entire display screen, the target driving currents of the multiple groups of display driving chips are generated based on the respective default driving currents and the current gain, and then the proportion of the target driving currents of the multiple groups of display driving chips after adjustment is fixed, and the display effect (such as white balance) of the display screen can be ensured.

[0064] In various embodiments of the application, the specific circuit of the operation submodule 1023 is not limited herein. Based on the concept of the application, those skilled in the art can determine the calculation logic between the basic parameter and the current gain or the target current gain according to the actual adjustable circuit of the display driving chip, and design the specific operation mode of the operation submodule 1023 based on the calculation logic.

[0065] The way in which the signal driving chip 10 obtains the current gain is not limited in the embodiments of the application. In an optional way, the protocol analysis module of the signal driving chip 10 analyzes the second communication signal received by the signal driving chip 10, and when it is determined that the second communication signal carries the current gain, the current gain is transmitted to the operation submodule 1023.

[0066] Protocol generation and protocol analysis both belong to the prior art, so the protocol generation module and the protocol analysis module can refer to the related explanations of the prior art, and the application will not be described in detail.

[0067] In an embodiment of the present application, as shown in Figure 7 The signal driving chip 10 further comprises a plurality of data transmission channels, and the plurality of data transmission channels have a one-to-one correspondence with the plurality of groups of display driving chips; wherein the data transmission channel corresponding to each group of display driving chips is used to push the first communication signal corresponding to the group of display driving chips to the group of display driving chips.

[0068] In an embodiment of the present application, the signal driving chip 10 can be realized by improving the existing Buffer chip, as shown in Figure 7 The signal driving chip 10 comprises a signal transmission channel and a plurality of data transmission channels. The signal transmission channel can comprise a clock signal CLK and an instruction LE. Different signals can be represented based on the different lengths of CLK and LE. The length of CLK corresponding to LE can be designed, for example, to represent an instruction for indicating a basic parameter or a configuration parameter or a target configuration parameter. The plurality of data transmission channels can comprise a data transmission channel SDI-R, a data transmission channel SDI-G, and a data transmission channel SDI-B. The SDI-R is connected to the first group of display driving chips 20 for driving red light beads to light up. The first communication signal based on, for example, the basic parameter U1 can be transmitted to the first group of display driving chips 20 through the SDI-R. The SDI-G is connected to the second group of display driving chips 30 for driving green light beads to light up. The first communication signal based on, for example, the basic parameter U2 can be transmitted to the second group of display driving chips 30 through the SDI-G. The SDI-B is connected to the third group of display driving chips 40 for driving blue light beads to light up. The first communication signal based on, for example, the basic parameter U3 can be transmitted to the third group of display driving chips 40 through the SDI-B.

[0069] As known in the art, the Buffer chip is a kind of signal straight-through chip, which is characterized in that the input signal is directly outputted after being processed by the Buffer chip to enhance the driving capability. Based on this idea that the signal driving chip 10 can be realized by improving the Buffer chip. In an embodiment of the present application, continuing to refer to Figure 7 Each data transmission channel is further provided with a selector 103. The selector 103 is used to select the first communication signal transmitted by the processing module or the second communication signal received by the signal driving chip 10 based on a selection signal. As shown in Figure 7As shown, the selector 103 on the data transmission channel SDI-R is Mux-R, one input end of Mux-R is connected with the channel entrance of SDI-R, the other input end of Mux-R is connected with the corresponding processing module 102, and the output end is connected with the channel exit of SDI-R; similarly, the selector 103 on the data transmission channel SDI-G is Mux-G, the other input end of Mux-G is connected with the corresponding processing module 102, and the output end is connected with the channel exit of SDI-G; the selector 103 on the data transmission channel SDI-B is Mux-B, the other input end of Mux-B is connected with the corresponding processing module 102, and the output end is connected with the channel exit of SDI-B. Based on the setting of the selector 103 in the embodiment, the communication mode between the existing Buffer chip and the display driving chip is retained, and the configuration of the driving current of the display driving chip can be realized at low cost.

[0070] Corresponding to different implementation manners of the processing module 102, the selector 103 can be applied to any embodiment of the processing module 102, and one input end of the selector 103 can be connected with the input end of the signal driving chip 10 or the protocol analysis module, and the other input end is connected with the output end of the protocol processing sub-module.

[0071] In different embodiments, the selection signal can be generated by the control sub-module 1021, for example, when the control sub-module 1021 reads out the first parameter in the memory 101, the control sub-module 1021 sends the selection signal to the selector 103, so that the selector 103 outputs the first communication signal output by the protocol processing sub-module; the selection signal can also be generated by the protocol processing sub-module or the protocol analysis module, and the specific implementation is not limited in the application.

[0072] Based on the same inventive concept, the embodiment of the application also provides an LED display screen, which is described in detail in the foregoing. Figure 8 The LED display screen comprises a controller 200 and the display module 100 described in the embodiment of the application, and the controller 200 is connected with the plurality of groups of display driving chips through the signal driving chip 10. The connection mode of the signal driving chip 10 and the plurality of groups of display driving chips, and the implementation principle and effects of the application are described in the foregoing, and will not be described in detail here.

[0073] It should be noted that each embodiment in the specification adopts a progressive manner for description, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to. It should also be noted that the "first" and "second" mentioned in the specification are only the distinction between different objects, and do not have the meaning of sequence or order.

[0074] The technical solutions provided by the present application are described in detail above, and the principles and implementation manners of the present application are described by using specific examples. The above description of the examples is only used to help understand the present application, and the content of the description should not be understood as a limitation on the present application. Meanwhile, for those skilled in the art, according to the present application, there will be different forms of changes in the specific implementation manners and application ranges, which do not need and cannot be exhausted here, and the obvious changes or changes derived therefrom are still within the protection scope of the present application.

Claims

1. A display module, characterized in that, include: The system includes a signal driver chip with enhanced driving capability and multiple sets of display driver chips. The multiple sets of display driver chips have a one-to-one correspondence with the color of the LED beads on the display module. Each set of display driver chips is used to drive the LED beads of its corresponding color to light up. The signal driving chip non-volatilely stores the basic parameters of each of the multiple sets of display driving chips. The basic parameters of each set of display driving chips are used to configure the driving current of that set of display driving chips to fix the driving current ratio of the multiple sets of display driving chips. The signal driving chip is used to process the basic parameters of each group of display driving chips according to the received trigger signal or the trigger signal generated within it, so as to output the corresponding first communication signal to each group of display driving chips. Each display driver chip generates drive current based on the first received communication signal, without relying on external resistors.

2. The display module according to claim 1, characterized in that, The signal driving chip includes a memory and multiple processing modules; The memory is used to store the basic parameters of each of the multiple sets of display driver chips; The plurality of processing modules have a one-to-one correspondence with the plurality of display driver chips. Each processing module is used to process the basic parameters of the target group display driver chip in the memory after receiving the trigger signal, so as to output the first communication signal corresponding to the target group display driver chip.

3. The display module according to claim 2, characterized in that, Each processing module includes a control submodule and a protocol generation submodule; The control submodule is used to control the reading of the basic parameters of the target group display driver chip that has a corresponding relationship with it in the memory according to the trigger signal; The protocol generation submodule is used to convert the read basic parameters into a first communication signal that can be recognized by the target group display driver chip, and output the first communication signal.

4. The display module according to claim 2, characterized in that, Each processing module includes a control submodule, a computation submodule, and a protocol generation submodule; The control submodule is used to control the reading of the basic parameters of the target group display driver chip that has a corresponding relationship with it in the memory according to the trigger signal; The calculation submodule is used to perform calculations on the read basic parameters and current gain to generate configuration parameters; wherein, the current gain is a data signal received by the signal driving chip that can adjust the driving current of the display driving chip; The protocol generation submodule is used to convert the configuration parameters into a first communication signal that can be recognized by the target group display driver chip, and output the first communication signal.

5. The display module according to claim 2, characterized in that, The memory is also used to store the configuration parameter ranges of the multiple sets of display driver chips; Each processing module includes a control submodule, a calculation submodule, a judgment submodule, and a protocol generation submodule; The control submodule is used to control the reading of the basic parameters of the target group display driver chip that has a corresponding relationship with it in the memory according to the trigger signal; The calculation submodule is used to perform calculations on the read basic parameters and current gain to generate configuration parameters; wherein, the current gain is a data signal received by the signal driving chip that can adjust the driving current of the display driving chip; The judgment submodule judges the configuration parameters output by the calculation submodule based on the configuration parameter range of the target group display driver chip stored in the memory, and outputs the target configuration parameters based on the judgment result; The protocol generation submodule is used to convert the target configuration parameters into a first communication signal that can be recognized by the target group display driver chip, and output the first communication signal.

6. The display module according to claim 2, characterized in that, The memory is also used to store the current gain range; each processing module includes a control submodule, a judgment submodule, a calculation submodule, and a protocol generation submodule. The control submodule is used to control the reading of the basic parameters of the target group display driver chip that has a corresponding relationship with it in the memory according to the trigger signal; The judgment submodule judges the received current gain based on the current gain range stored in the memory, and outputs the target current gain based on the judgment result; wherein, the current gain is the data signal received by the signal driving chip that can adjust the driving current of the display driving chip; The calculation submodule is used to perform calculations on the read basic parameters and the target current gain to generate configuration parameters; The protocol generation submodule is used to convert the configuration parameters into a first communication signal that can be recognized by the target group display driver chip, and output the first communication signal.

7. The display module according to claim 1 or 2, characterized in that, The signal driving chip also includes multiple data transmission channels, and the multiple data transmission channels have a one-to-one correspondence with the multiple sets of display driving chips; The data transmission channel corresponding to each group of display driver chips is used to push its corresponding first communication signal to that group of display driver chips.

8. The display module according to claim 7, characterized in that, Each data transmission channel is also equipped with a selector; The selector is used to select, based on the gating signal, whether to output a corresponding first communication signal or a second communication signal received by the signal driving chip.

9. The display module according to any one of claims 1-6, Its features are, The LEDs in the display module include red, green, and blue colors, and the multiple sets of display driver chips include: The first set of display driver chips used to drive the red LED beads to light up; The second set of display driver chips is used to drive the green LED beads to light up; The third set of display driver chips is used to drive the blue LED beads to light up.

10. An LED display screen, characterized in that, It includes a controller and a display module as described in any one of claims 1-9, wherein the controller is connected to the plurality of display driver chips respectively through the signal driver chip.

Images