Method for adjusting display screen brightness consistency based on static driving circuit

Abstract

The invention discloses a method for adjusting the brightness consistency of a display screen based on a static driving circuit. The driving chip of each LED lamp bead packaging module of the display screen is provided with a storage module, so that the control parameters when various current configuration parameters meet the standards and the initial information of the display screen can be stored in the storage module at the factory stage. Therefore, in the use stage of the display screen, various adjustments can be made to the display screen through adjustment software, including but not limited to brightness consistency adjustment. After the adjustment, the corrected current configuration parameters are obtained, and the corrected current configuration parameters are respectively written into each storage module, so as to implement light emission control on the display screen. Under the premise of not losing brightness and chromaticity, the brightness consistency of the entire display screen is achieved, so that the product is more energy-saving and reliable. The initial information of the display screen stored in the storage module can also be read by debugging software, and various parameter adjustments can be made to the display screen after leaving the factory as needed.

Description

Technical Field

[0001] The invention relates to the field of LED display screens, and in particular to a method for adjusting the brightness consistency of a display screen based on a static driving circuit. Background Art

[0002] At present, the driving methods of display devices can be roughly divided into two types, one is the dynamic (PM) driving method, and the other is the static (AM) driving method. The cost of the PM driving method is relatively low and it is technically easy to implement. However, with the improvement of display resolution, the scanning time of each line per unit time is shortened, especially when applied to large-size display devices, the PM driving method is difficult to implement. In order to solve the above problems, the display device can be divided into several areas for driving. The driving structure of this method is relatively complex, and there are brightness differences between the divided areas. The AM driving method can obtain better brightness uniformity and contrast, as well as higher resolution. Therefore, display devices using the AM driving method are becoming more and more popular.

[0003] In addition, due to manufacturing processes and other reasons, there is a 20% difference in the brightness of LED lamps, that is, there is a 20% difference in the three channels of red, green and blue. And due to cost pressure, it is generally believed that lamps with a wavelength difference of 5nm are qualified. When the display modules made of these different LEDs are integrated into an LED display screen, if these differences are not adequately compensated, the differences in brightness and color of the LED display screen will be clearly visible; at the same time, after the LED display screen has been installed and used for a period of time, the brightness and color of the LED will decay and change over time, which will greatly reduce the visual quality of the LED display screen; in addition, the replacement of damaged LED modules during the use of the LED display screen will cause the new modules to not match the entire screen, which will also greatly reduce the visual quality of the LED display screen.

[0004] Conventional light-emitting modules use a driver IC + external current configuration module mode, and the current configuration module uses a configuration resistor with a fixed resistance value; since the resistance value of the configuration resistor cannot be adjusted during use of the display screen, when the display screen is used to debug the brightness consistency, it can only adjust the pulse signal duty cycle of the input constant current driver module, and in order to achieve brightness consistency, it usually accommodates a lower pulse signal duty cycle, which will lose a certain amount of brightness and chromaticity adjustment space. And because in the prior art, the driver IC has no data storage function, if the receiving card is damaged, it is necessary to use the software program control again, replace the receiving card, and send a new program. Therefore, it is necessary to study a solution to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for adjusting the brightness consistency of a display screen based on a static driving circuit, by utilizing the current configuration parameters stored in the storage module of the driver chip of each LED lamp bead packaging module of the display screen, so as to achieve the brightness consistency of the entire display screen without losing brightness and chromaticity, thereby making the display screen more energy-saving and reliable.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] The present invention discloses a method for adjusting brightness consistency of a display screen based on a static driving circuit, which includes a display screen based on a static driving circuit to be debugged, debugging software and a cloud server; the display screen includes a sending card and a plurality of spliced ​​boxes, the box has a receiving card and a plurality of display modules connected to the receiving card, each display module includes a display circuit board and a plurality of LED lamp bead packaging modules, and each LED lamp bead packaging module is arranged in an array on the same side of the display circuit board; the LED lamp bead packaging module includes a packaging substrate and an LED chip group and a driving chip packaged on the packaging substrate; the driving chip integrates a control module, a communication module, a storage module, a current configuration module and three constant current driving modules, the control module is respectively connected to the communication module and the storage module, the control module is respectively connected to the three constant current driving modules, and the control module is also connected to the three constant current driving modules through the current configuration module The LED chips are connected to the three constant current drive modules respectively; the number of the LED chip groups is multiple and the LED chip groups are arranged in an array on the same side of the packaging substrate, and each LED chip group includes a red LED chip, a green LED chip and a blue LED chip; the red LED chip, the green LED chip and the blue LED chip of each LED chip group are respectively connected to the output ends of the three constant current drive modules of the driver chip; and the red LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, the green LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, and the blue LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module; the driver chip of the LED lamp bead packaging module of each display module of each box is connected to the receiving card of the box;

[0008] The adjustment method comprises the following steps:

[0009] Step 1, determining the initial current configuration parameters of the LED lamp bead packaging modules of the same batch, and writing the initial current configuration parameters into each LED lamp bead packaging module of the display screen;

[0010] (1) Taking one LED lamp bead packaging module from the same batch of LED lamp bead packaging modules as a test LED lamp bead packaging module for testing, the debugging software controls the test LED lamp bead packaging module through the sending card and the receiving card to write different current configuration parameters into the storage module of the driver chip of the test LED lamp bead packaging module, and the test LED lamp bead packaging module controls the light emission of the LED chipset according to the current configuration parameters stored in the storage module; when the various current configuration parameters of the LED chipset of the test LED lamp bead packaging module reach the required target value, the current configuration parameters stored in the storage module are the required initial current configuration parameters;

[0011] (2) The debugging software reads the initial current configuration parameters stored in the storage module of the driver chip of the test LED lamp bead packaging module, and uploads the initial current configuration parameters to the cloud server in the mode of "LED lamp bead packaging module batch ID + initial current configuration parameters", forming the initial configuration parameter file of the batch of display screens in the cloud server;

[0012] (3) In the process of using the same batch of LED lamp bead packaging modules to produce display screens, the initial current configuration parameters are written into the storage module of the driver chip of each LED lamp bead packaging module of the display screen through the debugging software;

[0013] Step 2: When using the display, the user can debug the brightness consistency of the display through the PC or mobile terminal:

[0014] During the use of the display screen, if the user needs to debug the brightness of the display screen through a PC or a mobile terminal, the debugging software is pre-installed on the PC or the mobile terminal. The user first retrieves the initial configuration parameter file of the LED lamp bead packaging module of the batch corresponding to the LED lamp bead packaging module of the display screen to be debugged from the cloud server through the debugging software. Then, based on the initial current configuration parameters in the initial configuration parameter file, the user adjusts the brightness consistency of the display screen to be debugged through the debugging software on the PC or the mobile terminal, and adjusts the current configuration parameters stored in the storage module of the driver chip while adjusting the duty cycle of the pulse signal received by each constant current driver module of the driver chip, and adjusts the dual parameters simultaneously. After the adjustment, the corrected current configuration parameters can be obtained; finally, the user establishes a communication channel with each LED lamp bead packaging module of the display screen through the adjustment software via the sending card and the receiving card of the display screen, and writes the corrected current configuration parameters into the storage module of the corresponding LED lamp bead packaging module driver chip, thereby realizing the brightness consistency adjustment of the display screen during use.

[0015] The driver chip is also integrated with three chip identification modules, which correspond to the three constant current drive modules respectively. The input end and the ground end of each chip identification module are respectively connected to the power supply end and the ground end of the constant current drive module corresponding to the chip identification module, and the output ends of the three chip identification modules are connected to the control module; the anodes of the red LED chip, the green LED chip and the blue LED chip of each LED chip group are respectively connected to the output ends of the three constant current drive modules, and the cathodes of the red LED chip, the green LED chip and the blue LED chip of each LED chip group are grounded; and the anodes of the red LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, the anodes of the green LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, and the anodes of the blue LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module.

[0016] The chip identification module comprises a voltage sampling circuit, a subtractor circuit, and a threshold signal generating circuit; the input end and the ground end of the voltage sampling circuit are respectively connected to the input end and the ground end of the chip identification module, the output end of the voltage sampling circuit is connected to the first input end of the subtractor circuit, the output end of the threshold signal generating circuit is connected to the second input end of the subtractor circuit, and the output end of the subtractor circuit is connected to the output end of the chip identification module.

[0017] The driver chip also integrates three voltage regulating modules connected to the control module, and the output ends of the three voltage regulating modules are respectively connected to the power supply ends of the three constant current driving modules.

[0018] The voltage regulation module includes a PWM power drive circuit and a voltage stabilizing circuit connected to the output end of the PWM power drive circuit; the PWM power drive circuit of each voltage regulation module is connected to the control module, and the output end of the voltage stabilizing circuit of each voltage regulation module is connected to the output end of the voltage regulation module; the PWM power drive circuit of each voltage regulation module is also connected to the control module through a current limiting comparator.

[0019] The LED lamp bead packaging module also includes a packaging layer covering each LED chip group.

[0020] The packaging substrate is one of a glass substrate, a PCB board, a ceramic substrate or an FPC board.

[0021] The initial configuration parameter file also includes initial information of the display screen, which includes various hardware parameters and control parameters uploaded to the cloud server during the production process of the display screen.

[0022] After adopting the above scheme, the present invention has the following characteristics:

[0023] 1. The storage module of the driver chip of the LED lamp bead packaging module of the present invention is used to store current configuration parameters for setting the output current of the constant current driver module, and the current configuration parameters include a red light LED current setting value corresponding to the red light LED chip, a green light LED current setting value corresponding to the green light LED chip, and a blue light LED current setting value corresponding to the blue light LED chip; and the control module of the driver chip reads the current configuration parameters stored in the storage module, and the control module of the driver chip controls the current configuration module according to the red light LED current setting value, the green light LED current setting value and the blue light LED current setting value, thereby controlling the output current of the three constant current driver modules of the driver chip, so that The output of the constant current driving module connected to the red LED chip of each LED chip group meets the working current required by the red LED chip, so that the output of the constant current driving module connected to the green LED chip of each LED chip group meets the working current required by the green LED chip, so that the output of the constant current driving module connected to the blue LED chip of each LED chip group meets the working current required by the blue LED chip, so that the light emission consistency of each LED chip group of the LED lamp bead packaging module is good, and the light emission colors of the red LED chip, green LED chip and blue LED chip of the LED chip group are accurate, so that the display effect of the LED lamp bead packaging module is good, and then the display effect of the display screen is good;

[0024] 2. The control module of the LED lamp bead packaging module of the present invention can detect the types of LED chips connected to the three constant current drive modules through three chip identification modules, which can reduce the restrictions on the connection between each LED chip group and the driver chip, making the wiring of the LED lamp bead packaging module more flexible and making the LED lamp bead packaging module more flexible and convenient to use;

[0025] 3. The control module of the LED lamp bead packaging module of the present invention can adjust the power supply terminal voltage of the three constant current driving modules through three voltage regulating modules, so that the voltage drop of the three constant current driving modules will not be too high, thereby reducing the power consumption and heat generation of the driving chip;

[0026] 4. The driver chip of each LED lamp bead packaging module in the display screen adopted by the present invention is provided with a storage module, so the control parameters when various current configuration parameters meet the standards and the initial information of the display screen can be stored in the storage module at the factory stage, so that during the use stage of the display screen, the display screen can be adjusted in various ways through the adjustment software, including but not limited to brightness consistency adjustment. After the adjustment, the corrected current configuration parameters are obtained, and the corrected current configuration parameters are written into each storage module respectively, so as to implement light-emitting control of the display screen, and achieve the consistency of brightness of the entire display screen without losing brightness and chromaticity, making the product more energy-saving and reliable. The debugging software can also be used to read the initial information of the display screen stored in the storage module, and various parameter adjustments can be made to the display screen after leaving the factory as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of the LED lamp bead packaging module involved in the present invention;

[0028] Figure 2 This is a principle block diagram of the LED lamp bead packaging module driver chip involved in the present invention;

[0029] Figure 3 Part of the principle of the LED lamp bead packaging module driver chip of the present invention Figure 1 ;

[0030] Figure 4 Part of the principle of the LED lamp bead packaging module driver chip of the present invention Figure 2 ;

[0031] Figure 5 A connection diagram of a display screen of the present invention;

[0032] Figure 6 is a schematic structural diagram of a display module of the present invention;

[0033] Figure 7 A schematic diagram of the circuit connection between the receiving card and the display module of the present invention;

[0034] Description of labels:

[0035] LED lamp bead packaging module A, packaging substrate 1, LED chip group 2, red LED chip 21, green LED chip 22, blue LED chip 23, driver chip 3, control module 31, communication module 32, storage module 33, current configuration module 34, constant current drive module 35, chip identification module 36, voltage sampling circuit 361, first sampling resistor 3611, second sampling resistor 3612, subtractor circuit 362, threshold signal generating circuit 363, voltage regulation module 37, PWM power driving circuit 371, first power MOS tube 3711, second power MOS tube 3712, power resistor 3713, voltage stabilizing circuit 372, voltage stabilizing inductor 3721, voltage stabilizing capacitor 3722, voltage stabilizing tube 3723, current limiting comparator 38, temperature detection module 39,

[0036] Box B, receiving card B1, display module B2, display circuit board B21,

[0037] Send card C. DETAILED DESCRIPTION

[0038] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0039] like Figure 5 and Figure 6 As shown, the present invention relates to a display screen based on a static driving circuit, which includes a sending card C and a plurality of spliced ​​boxes B, wherein the box B has a receiving card B1 and a plurality of display modules B2 connected to the receiving card B1, each display module B2 includes a display circuit board B21, and a plurality of LED lamp bead packaging modules A, and each LED lamp bead packaging module A is arranged in an array on the same side of the display circuit board B21; the LED lamp bead packaging module A3 of each display module B2 of each box B is connected to the receiving card B1 of the box B.

[0040] like Figures 1 to 4As shown, the LED lamp bead packaging module A includes a packaging substrate 1 and an LED chip group 2 and a driver chip 3 packaged on the packaging substrate 1, and the driver chip 3 is connected to the receiving card B1; wherein the driver chip 3 integrates a control module 31, a communication module 32, a storage module 33, a current configuration module 34 and three constant current drive modules 35, the control module 31 is connected to the communication module 32 and the storage module 33 respectively, the control module 31 is connected to the three constant current drive modules 35 respectively, and the control module 31 is also connected to the three constant current drive modules 35 respectively through the current configuration module 34; the number of the LED chip groups 2 is multiple and each LED chip group 2 is arranged in an array on the same side of the packaging substrate 1 On one side, each LED chip group 2 includes a red LED chip 21, a green LED chip 22 and a blue LED chip 23; the red LED chip 21, the green LED chip 22 and the blue LED chip 23 of each LED chip group 2 are respectively connected to the output ends of the three constant current drive modules 35 of the driver chip 3; and the red LED chips 21 of each LED chip group 2 are respectively connected to different output ends of the same constant current drive module 35, the green LED chips 22 of each LED chip group 2 are respectively connected to different output ends of the same constant current drive module 35, and the blue LED chips 23 of each LED chip group 2 are respectively connected to different output ends of the same constant current drive module 35. Figure 1 As shown, the number of LED chip groups 2 of the LED lamp bead packaging module A can be four, and the four LED chip groups 2 are distributed in a 2*2 array.

[0041] The packaging substrate 1 can be a glass substrate, a PCB board, a ceramic substrate, an FPC board, etc.

[0042] In the present invention, the storage module 33 of the driver chip 3 stores current configuration parameters for setting the output current of the constant current driver module 35, and the current configuration parameters are respectively a red light LED current setting value corresponding to the red light LED chip 21, a green light LED current setting value corresponding to the green light LED chip 22, and a blue light LED current setting value corresponding to the blue light LED chip 23; and the control module 31 of the driver chip 3 reads the current configuration parameters stored in the storage module 33, and the control module 31 of the driver chip 3 controls the current configuration module 34 according to the red light LED current setting value, the green light LED current setting value and the blue light LED current setting value, thereby controlling the maximum output current of the three constant current driver modules 35 of the driver chip 3, and the current configuration module 34 may include three variable resistors with variable resistance; the driver chip 3 also adjusts the pulse signal input to the three constant current driver modules 35 The duty cycle is used to adjust the actual output current of the three constant current driving modules 35. In this way, the present invention can make the constant current driving module 35 connected to the red light LED chip 21 of each LED chip group 2 output the working current that meets the requirements of the red light LED chip 21, and make the constant current driving module 35 connected to the green light LED chip 22 of each LED chip group 2 output the working current that meets the requirements of the green light LED chip 22, so that the constant current driving module 35 connected to the blue light LED chip 23 of each LED chip group 2 outputs the working current that meets the requirements of the blue light LED chip 23. In this way, the light emission consistency of each LED chip group 2 of the LED lamp bead packaging module A is good, and the light emission colors of the red light LED chip 21, the green light LED chip 22 and the blue light LED chip 23 of the LED chip group 2 are all accurate, so that the LED lamp bead packaging module A has a good display effect and has the effects of energy saving and heat reduction.

[0043] In the present invention, the driver chip 3 of the LED lamp bead packaging module A is also integrated with three chip identification modules 36, and the three chip identification modules 36 correspond to the three constant current driving modules 35 respectively. The input end and the ground end of each chip identification module 36 are respectively connected to the power supply end and the ground end of the constant current driving module 35 corresponding to the chip identification module 36, and the output ends of the three chip identification modules 36 are connected to the control module 31; and the LED chip group 2 adopts a common cathode structure, wherein the anodes of the red light LED chip 21, the green light LED chip 22 and the blue light LED chip 23 of each LED chip group 2 are respectively connected to the anode of the driver chip 3. The output ends of the three constant current driving modules 35 are connected, and the cathodes of the red LED chips 21, the green LED chips 22 and the blue LED chips 23 of each LED chip group 2 are connected to the GND pin of the driving chip 3 and grounded; and the anodes of the red LED chips 21 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35, the anodes of the green LED chips 22 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35, and the anodes of the blue LED chips 23 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35. The control module 31 of the LED lamp bead packaging module A detects the type of LED chips connected to the three constant current drive modules 35 through the three chip identification modules 36, that is, detects which of the red LED chip 21, the green LED chip 22 and the blue LED chip 23 is connected to the output end of the constant current drive module 35, and the control module 31 adjusts the maximum output current of the three constant current drive modules 35 according to the detection result and the current configuration parameters stored in the storage module 33; in this way, when the LED chip groups 2 with different structural settings are set on the LED lamp bead packaging module A, it is only necessary to control the connection relationship between each LED chip group 2 and the driver chip 3 to meet: "The red LED chip 21, the green LED chip 22 and the blue LED chip 23 of each LED chip group 2 are respectively connected to the three constant current drivers The output end of the driving module 35 is connected, and the red LED chips 21 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35, the green LED chips 22 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35, and the blue LED chips 23 of each LED chip group 2 are respectively connected to different output ends of the same constant current driving module 35". There is no need to require the red LED chips 21, green LED chips 22 and blue LED chips 23 of each LED chip group 2 to be accurately connected to a specific constant current driving module 35, so that the wiring of the LED lamp bead packaging module A is more flexible, and the driving chip 3 can also automatically match the LED chips groups 2 with different structural settings, so that the LED lamp bead packaging module A is more flexible and convenient to use.

[0044] In the present invention, the chip identification module 36 of the driving chip 3 of the LED lamp bead packaging module A specifically includes a voltage sampling circuit 361, a subtractor circuit 362 and a threshold signal generating circuit 363; the input end and the ground end of the voltage sampling circuit 361 are respectively connected to the input end and the ground end of the chip identification module 36, the output end of the voltage sampling circuit 361 is connected to the first input end of the subtractor circuit 362, the output end of the threshold signal generating circuit 363 is connected to the second input end of the subtractor circuit 362, and the output end of the subtractor circuit 362 is connected to the output end of the chip identification module 36; wherein the voltage sampling circuit 361 may include a first sampling resistor 3611 and a second sampling resistor 3612. The working principle of the chip identification module 36 is as follows: when the LED lamp bead packaging module A is used for the first time, the same voltage is connected to the power supply ends of the three constant current driving modules 35 and the three constant current driving modules output the same current. Since the red light LED chip 21, the green light LED chip 22 and the blue light LED chip 23 of the LED chip group 2 have different conduction voltage drops, the voltage drops of the three constant current driving modules 35 are different. The voltage sampling circuit 361 of each chip identification module 36 collects the voltage drop of the constant current driving module 35 corresponding to the chip identification module 36, and subtracts the collected voltage drop of the constant current driving module 35 from the voltage output by the threshold signal generating circuit 363 through the subtractor circuit 362, and finally outputs the calculation result to the control module 31; because the voltage drops of the three constant current driving modules 35 are different, the calculation results of the three chip identification modules 36 will also be different. The control module 31 compares the calculation results of the three chip identification modules 36 to determine the type of LED chips connected to the output ends of the three constant current driving modules 35. The configuration of the subtractor circuit 362 can prevent the voltage input to the control module 31 from being too large and causing damage to the control module 31 .

[0045] In the present invention, the driver chip 3 of the LED lamp bead packaging module A also integrates three voltage regulation modules 37 connected to the control module 31, and the output ends of the three voltage regulation modules 37 are respectively connected to the power supply ends of the three constant current driving modules 35. The three voltage regulation modules 37 are used to control the power supply end voltage of the three constant current driving modules 35. When the LED lamp bead packaging module A of the present invention is used, the control module 31 first controls the power supply terminal voltages of the three constant current driving modules 35 of the driving chip 3 to be the same through the three voltage regulating modules 37 of the driving chip 3; then, the control module 31 detects the types of LED chips connected to the three constant current driving modules 35 through the three chip identification modules 36; then, the control module 31 adjusts the maximum output currents of the three constant current driving modules 35 according to the detection results and the current configuration parameters stored in the storage module 33 to ensure the luminous consistency and luminous color accuracy of each LED chip group 2 of the LED lamp bead packaging module A; at the same time, the control module 31 also controls the three voltage regulating modules 37 according to the detection results to adjust the power supply terminal voltages of the three constant current driving modules 35, so that the voltage drop of the three constant current driving modules 35 will not be too high, thereby reducing the power consumption and heat generation of the driving chip 3.

[0046] In the present invention, the voltage regulating module 37 of the driving chip 3 of the LED lamp bead packaging module A includes a PWM power driving circuit 371 and a voltage stabilizing circuit 372 connected to the output end of the PWM power driving circuit 371, the PWM power driving circuit 371 may include a first power MOS tube 3711, a second power MOS tube 3712 and a power resistor 3713, and the voltage stabilizing circuit 372 may include a voltage stabilizing inductor 3721, a voltage stabilizing capacitor 3722 and a voltage stabilizing tube 3723; the PWM power driving circuit 371 of each voltage regulating module 37 is connected to the control module 31, the control module 31 controls the on and off of the first power MOS tube 3711 and the second power MOS tube 3712, and the output end of the voltage stabilizing circuit 372 of each voltage regulating module 37 is connected to the output end of the voltage regulating module 37. The voltage stabilizing circuit 372 converts the pulse signal output by the PWM power driving circuit 371 into a DC signal to supply power to the power supply end of the constant current driving module 35, and the control module 31 controls the frequency and duty cycle of the pulse signal output by the PWM power driving circuit 371 by controlling the switching frequency and switching time of the PWM power driving circuit 371, thereby adjusting the voltage supplied to the power supply end of the constant current driving module 35 and controlling the voltage at the power supply end of the constant current driving module 35.

[0047] In the present invention, the PWM power driving circuit 371 of each voltage regulating module 37 of the driving chip 3 of the LED lamp bead packaging module A is also connected to the control module 31 through the current limiting comparator 38. The current limiting comparator 38 is used to detect whether the working current of the PWM power driving circuit 371 exceeds the set threshold value, and feeds back the corresponding detection result to the control module 31. The control module 31 controls the PWM power driving circuit 371 according to the detection result, so as to prevent the working current of the PWM power driving circuit 371 from being too large and causing damage to the PWM power driving circuit 371.

[0048] In the present invention, the driver chip 3 of the LED lamp bead packaging module A is also integrated with a temperature detection module 39 connected to the control module 31. The control module 31 detects the temperature of the driver chip 3 itself through the temperature detection module 39; when the temperature of the driver chip 3 itself is too high, the control module 31 controls the output voltage of each voltage regulation module 37 to reduce, thereby reducing the temperature of the driver chip 3 and reducing the risk of overheating and damage of the driver chip 3.

[0049] In the present invention, the driver chip 3 of the LED lamp bead packaging module A can lead out a VCC pin, a GND pin, an SDIOA pin, an SDIOB pin, a CLK pin, multiple OUT1 pins, multiple OUT2 pins and multiple OUT3 pins, wherein the VCC pin is used to access the power supply to power the internal module of the driver chip 3, the GND pin is used for grounding, the SDIOA pin is used to access the serial data signal, the SDIOB pin is used to output the serial data signal, the CLK pin is used to access the clock signal, the communication module 32 is connected to the SDIOA pin, the SDIOB pin and the CLK pin, each OUT1 pin is used for the first constant current drive module 35 among the three constant current drive modules 35 to output current, each OUT2 pin is used for the second constant current drive module 35 among the three constant current drive modules 35 to output current, and each OUT3 pin is used for the third constant current drive module 35 among the three constant current drive modules 35 to output current.

[0050] In the present invention, the LED lamp bead packaging module A may also include a packaging layer (not shown) covering each LED chip group 2. The packaging layer can prevent the LED chip group 2 from shifting and protect the LED chip group 2. The packaging layer adopts a light-transmitting structure, and the packaging layer can specifically adopt a light-guiding glue.

[0051] Cooperate Figure 7As shown, the LED lamp bead packaging modules A of the display module B2 are cascaded, wherein the SDIOB pin of the first LED lamp bead packaging module A is connected to the SDIOA pin of the second LED lamp bead packaging module A, the SDIOB pin of the second LED lamp bead packaging module A is connected to the SDIOA pin of the third LED lamp bead packaging module A, and so on, the SDIOB pin of the second-to-last LED lamp bead packaging module A is connected to the SDIOA pin of the first-to-last LED lamp bead packaging module A; and the receiving card B1 is connected to the SDIOA pin of the first LED lamp bead packaging module A, and the receiving card B1 is also connected to the CLK pins of each LED lamp bead packaging module A. In the present invention, the receiving card B1 communicates with each LED lamp bead packaging module A, and the receiving card B1 can read the current configuration parameters stored in the storage module 33 of each LED lamp bead packaging module A; when the display screen replaces a certain LED lamp bead packaging module A after leaving the factory, the receiving card B1 can read the current configuration parameters stored in the storage module 33 of the LED lamp bead packaging module A that has not been replaced, and then the receiving card B1 writes the current configuration parameters into the storage module 33 of the replaced LED lamp bead packaging module A, thereby realizing the automatic setting of the current configuration parameters stored in the storage module 33 after the replaced LED lamp bead packaging module A, and facilitating the replacement of the LED lamp bead packaging module A; in addition, when the display screen leaves the factory, the user can write the required current configuration parameters to the storage module 33 of the LED lamp bead packaging module A through the receiving card B1, so that the user can flexibly configure the luminous effect of the LED lamp bead packaging module A.

[0052] The method for adjusting brightness consistency of a display screen based on a static driving circuit of the present invention comprises a display screen based on a static driving circuit to be debugged, debugging software and a cloud server, and specifically comprises the following steps:

[0053] Step 1, determining the initial current configuration parameters of the LED lamp bead packaging modules A of the same batch, and writing the initial current configuration parameters into each LED lamp bead packaging module A of the display screen;

[0054] (1) Take an LED lamp bead packaging module A from the same batch of LED lamp bead packaging modules A as a test LED lamp bead packaging module for testing. The debugging software controls the test LED lamp bead packaging module through the sending card C and the receiving card B1, and then writes different current configuration parameters into the storage module 33 of the driver chip 3 of the test LED lamp bead packaging module. The test LED lamp bead packaging module controls the light emission of the LED chipset 2 according to the current configuration parameters stored in the storage module 33. When the current configuration parameters of the LED chipset 2 of the test LED lamp bead packaging module reach the required target value, the current configuration parameters stored in the storage module 33 are the required initial current configuration parameters.

[0055] (2) The debugging software reads the initial current configuration parameters stored in the storage module 33 of the driver chip 3 of the test LED lamp bead packaging module, and uploads the initial current configuration parameters to the cloud server in the mode of "LED lamp bead packaging module batch ID + initial current configuration parameters", thereby forming an initial configuration parameter file of the batch of display screens in the cloud server;

[0056] (3) In the process of using the same batch of LED lamp bead packaging modules A to produce display screens, the initial current configuration parameters are written into the storage module 33 of the driver chip 3 of each LED lamp bead packaging module A of the display screen through the debugging software;

[0057] Step 2: When using the display, the user can debug the brightness consistency of the display through the PC or mobile terminal:

[0058] During the use of the display screen, if the user needs to debug the brightness of the display screen through a PC or a mobile terminal, the debugging software is pre-installed on the PC or the mobile terminal. The user first uses the debugging software to retrieve the initial configuration parameter file of the LED lamp bead packaging module A of the batch corresponding to the LED lamp bead packaging module A of the display screen to be debugged from the cloud server. Then, based on the initial current configuration parameters in the initial configuration parameter file, the user uses the debugging software to adjust the brightness consistency of the display screen to be debugged on the PC or the mobile terminal, and adjusts the current configuration parameters stored in the storage module 33 of the driver chip 3 while adjusting the duty cycle of the pulse signal received by each constant current driver module of the driver chip 3, so as to adjust the dual parameters simultaneously. After the adjustment, the corrected current configuration parameters can be obtained. Finally, the user uses the adjustment software to establish a communication channel with each LED lamp bead packaging module A of the display screen via the sending card C and the receiving card B1 of the display screen, and writes the corrected current configuration parameters into the storage module 33 of the corresponding LED lamp bead packaging module A driver chip 3, respectively, so as to achieve brightness consistency adjustment of the display screen during use.

[0059] The initial configuration parameter file also includes initial information of the display screen, which includes various hardware parameters, control parameters, etc. uploaded to the cloud server during the production process of the display screen.

[0060] Since the driver chip 3 of each LED lamp bead packaging module A in the display screen adopted by the present invention is provided with a storage module 33, the control parameters when various current configuration parameters meet the standards and the initial information of the display screen can be stored in the storage module 33 at the factory stage, so that during the use stage of the display screen, various adjustments can be made to the display screen through the adjustment software, including but not limited to brightness consistency adjustment. After the adjustment, the corrected current configuration parameters are obtained, and the corrected current configuration parameters are written into each storage module 33 respectively, so as to implement light-emitting control of the display screen, and achieve the consistency of brightness of the entire display screen without losing brightness and chromaticity, making the product more energy-saving and reliable. The debugging software can also be used to read the initial information of the display screen stored in the storage module 33, and various parameter adjustments can be made to the display screen after leaving the factory as needed.

[0061] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A method for adjusting the brightness consistency of a display screen based on a static driving circuit, characterized in that: Including a display screen based on a static driving circuit to be debugged, debugging software and a cloud server; The display screen includes a sending card and a plurality of spliced ​​boxes, the boxes have a receiving card and a plurality of display modules connected to the receiving card, each display module includes a display circuit board and a plurality of LED lamp bead packaging modules, and each LED lamp bead packaging module is arranged in an array on the same side of the display circuit board; The LED lamp bead packaging module includes a packaging substrate and an LED chip group and a driver chip packaged on the packaging substrate; the driver chip integrates a control module, a communication module, a storage module, a current configuration module and three constant current drive modules, the control module is respectively connected to the communication module and the storage module, the control module is respectively connected to the three constant current drive modules, and the control module is also respectively connected to the three constant current drive modules through the current configuration module; the number of the LED chip groups is multiple and each LED chip group is arranged in an array on the same side of the packaging substrate, each LED chip group includes a red LED chip, a green LED chip and a blue LED chip; the red LED chip, the green LED chip and the blue LED chip of each LED chip group are respectively connected to the output ends of the three constant current drive modules of the driver chip; and the red LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, the green LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, and the blue LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module; the driver chip of the LED lamp bead packaging module of each display module of each box is connected to the receiving card of the box; The adjustment method comprises the following steps: Step 1, determining the initial current configuration parameters of the LED lamp bead packaging modules of the same batch, and writing the initial current configuration parameters into each LED lamp bead packaging module of the display screen; (1) Taking one LED lamp bead packaging module from the same batch of LED lamp bead packaging modules as a test LED lamp bead packaging module for testing, the debugging software controls the test LED lamp bead packaging module through the sending card and the receiving card to write different current configuration parameters into the storage module of the driver chip of the test LED lamp bead packaging module, and the test LED lamp bead packaging module controls the light emission of the LED chipset according to the current configuration parameters stored in the storage module; when the various current configuration parameters of the LED chipset of the test LED lamp bead packaging module reach the required target value, the current configuration parameters stored in the storage module are the required initial current configuration parameters; (2) The debugging software reads the initial current configuration parameters stored in the storage module of the driver chip of the test LED lamp bead packaging module, and uploads the initial current configuration parameters to the cloud server in the mode of "LED lamp bead packaging module batch ID + initial current configuration parameters", forming the initial configuration parameter file of the batch of display screens in the cloud server; (3) In the process of using the same batch of LED lamp bead packaging modules to produce display screens, the initial current configuration parameters are written into the storage module of the driver chip of each LED lamp bead packaging module of the display screen through the debugging software; Step 2: When using the display, the user can debug the brightness consistency of the display through the PC or mobile terminal: During the use of the display screen, if the user needs to debug the brightness of the display screen through a PC or a mobile terminal, the debugging software is pre-installed on the PC or the mobile terminal. The user first uses the debugging software to retrieve the initial configuration parameter file of the LED lamp bead packaging module of the batch corresponding to the LED lamp bead packaging module of the display screen to be debugged from the cloud server. Then, based on the initial current configuration parameters in the initial configuration parameter file, the user uses the debugging software to adjust the brightness consistency of the display screen to be debugged on the PC or the mobile terminal, and adjusts the current configuration parameters stored in the storage module of the driver chip while adjusting the duty cycle of the pulse signal received by each constant current driver module of the driver chip, and adjusts the dual parameters simultaneously. After the adjustment, the corrected current configuration parameters can be obtained; finally, the user uses the debugging software to establish a communication channel with each LED lamp bead packaging module of the display screen via the sending card and the receiving card of the display screen, and writes the corrected current configuration parameters into the storage module of the corresponding LED lamp bead packaging module driver chip, thereby realizing the brightness consistency adjustment of the display screen during use.

2. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to claim 1, characterized in that: The driver chip is also integrated with three chip identification modules, which correspond to the three constant current drive modules respectively, and the input end and the ground end of each chip identification module are respectively connected to the power supply end and the ground end of the constant current drive module corresponding to the chip identification module, and the output ends of the three chip identification modules are connected to the control module; The anodes of the red LED chips, green LED chips and blue LED chips of each LED chip group are respectively connected to the output ends of the three constant current drive modules, and the cathodes of the red LED chips, green LED chips and blue LED chips of each LED chip group are grounded; and the anodes of the red LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, the anodes of the green LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module, and the anodes of the blue LED chips of each LED chip group are respectively connected to different output ends of the same constant current drive module.

3. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to claim 2, characterized in that: The chip identification module comprises a voltage sampling circuit, a subtractor circuit, and a threshold signal generating circuit; the input end and the ground end of the voltage sampling circuit are respectively connected to the input end and the ground end of the chip identification module, the output end of the voltage sampling circuit is connected to the first input end of the subtractor circuit, the output end of the threshold signal generating circuit is connected to the second input end of the subtractor circuit, and the output end of the subtractor circuit is connected to the output end of the chip identification module.

4. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to claim 1, characterized in that: The driver chip also integrates three voltage regulating modules connected to the control module, and the output ends of the three voltage regulating modules are respectively connected to the power supply ends of the three constant current driving modules.

5. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to claim 4, characterized in that: The voltage regulating module includes a PWM power driving circuit and a voltage stabilizing circuit connected to the output end of the PWM power driving circuit; the PWM power driving circuit of each voltage regulating module is connected to the control module, and the output end of the voltage stabilizing circuit of each voltage regulating module is connected to the output end of the voltage regulating module; The PWM power driving circuit of each voltage regulating module is also connected to the control module through a current limiting comparator.

6. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to claim 1, characterized in that: The LED lamp bead packaging module also includes a packaging layer covering each LED chip group.

7. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to any one of claims 1 to 6, characterized in that: The packaging substrate is one of a glass substrate, a PCB board, a ceramic substrate or an FPC board.

8. The method for adjusting brightness consistency of a display screen based on a static driving circuit according to any one of claims 1 to 6, characterized in that: The initial configuration parameter file also includes initial information of the display screen, which includes various hardware parameters and control parameters uploaded to the cloud server during the production process of the display screen.

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