LED brightness adjusting circuit and LED display screen

Abstract

This application discloses an LED brightness adjustment circuit and an LED display screen. The LED brightness adjustment circuit includes: an encoder module for acquiring brightness adjustment information and converting the brightness adjustment information into a brightness adjustment electrical signal; a control module connected to the encoder module for outputting a brightness control signal according to the brightness adjustment electrical signal; and a brightness adjustment module, one end connected to the control module and the other end connected to the driver chip, which controls the driver chip to adjust the luminous brightness of the LED bead array according to the brightness control signal. This application's technical solution, without altering the original structure of the LED display screen, allows for rapid brightness adjustment of the LED display screen through the LED brightness adjustment circuit, thereby reducing reliance on LED display screen suppliers and improving the flexibility of LED brightness adjustment.

Description

Technical Field

[0001] This application belongs to the field of display screen technology, specifically relating to an LED brightness adjustment circuit and an LED display screen. Background Technology

[0002] In the LED (Light-Emitting Diode) display industry, "large screens" are often a hot topic. Their hundreds or thousands of square meters create a stunning visual effect that is truly eye-catching. In the digital age, LED brightness adjustment circuits, as an important medium for urban landscaping and advertising, have spread to every corner of the city.

[0003] In some situations, it is necessary to introduce or demonstrate the display effect of an LED display so that the user can determine the quality of the LED display. However, current LED displays can only adjust the brightness of the screen through their built-in transmitter box or supplier technology. This not only requires carrying a lot of equipment, but also requires personnel training before operation, which greatly reduces the portability of display brightness adjustment.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide an LED brightness adjustment circuit and an LED display screen to improve the convenience of LED display screen brightness adjustment.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to one aspect of the embodiments of this application, an LED brightness adjustment circuit is provided, applied to an LED display screen, the LED display screen including a driver chip and an LED bead array connected to the driver chip, the driver chip being used to drive the LED bead array to emit light; the LED brightness adjustment circuit includes: The encoder module is used to acquire brightness adjustment information and convert the brightness adjustment information into a brightness adjustment electrical signal; The control module, connected to the encoder module, is used to output a brightness control signal according to the brightness adjustment electrical signal; The brightness adjustment module is connected to the control module at one end and to the driver chip at the other end. The brightness adjustment module is used to control the driver chip to adjust the brightness of the LED beads according to the brightness control signal.

[0008] In one embodiment of this application, the encoder module includes a knob structure and an encoder disk connected to the knob structure. The knob structure is used to acquire brightness adjustment information, and the encoder disk is used to convert the brightness adjustment information into a brightness adjustment electrical signal.

[0009] In one embodiment of this application, the encoder disk includes a first signal terminal, a second signal terminal, and a third signal terminal. The first signal terminal and the second signal terminal are connected to the knob structure and to the control module, and the third signal terminal is grounded. When the knob structure is rotated, the first signal terminal and the second signal terminal output the brightness adjustment electrical signal to the control module based on the rotation angle of the knob structure.

[0010] In one embodiment of this application, the encoder includes a fourth signal terminal and a fifth signal terminal. The fourth signal terminal is connected to the knob structure and to the control module, and the fifth signal terminal is grounded. When the knob structure is pressed, the fourth signal terminal outputs a current resistance value storage signal to the control module.

[0011] In one embodiment of this application, the control module includes a control chip, a first pull-up resistor, a second pull-up resistor, and a third pull-up resistor. The control chip includes a first input terminal, a second input terminal, a third input terminal, and an output terminal. The first input terminal is connected to the first signal terminal, the second input terminal is connected to the second signal terminal, the third input terminal is connected to the fourth signal terminal, and the output terminal is connected to the brightness adjustment module. One end of the first pull-up resistor is connected to the first input terminal, and the other end is connected to the operating power supply; one end of the second pull-up resistor is connected to the second input terminal, and the other end is connected to the operating power supply; one end of the third pull-up resistor is connected to the third input terminal, and the other end is connected to the operating power supply.

[0012] In one embodiment of this application, the brightness adjustment module includes at least one digital potentiometer, and each of the at least one digital potentiometer is connected to the control module, with each digital potentiometer connected to one of the driver chips.

[0013] In one embodiment of this application, the brightness adjustment module further includes an adjustment resistor; the digital potentiometer includes a data input terminal, a signal output terminal, a first resistor terminal, and a second resistor terminal. The data input terminal is connected to the control module, the signal output terminal is connected to the driver chip, the first resistor terminal is grounded through the adjustment resistor, and the second resistor terminal is grounded; wherein, the digital potentiometer adjusts the position of the signal output terminal relative to the first resistor terminal or the second resistor terminal according to the brightness control signal, so that the signal output terminal outputs a resistance value matching the brightness control signal to the driver chip.

[0014] In one embodiment of this application, the digital potentiometer further includes a chip select terminal and a clock terminal. The chip select terminal is connected to the control module and is used to receive a chip select signal; the clock terminal is connected to the control module and is used to receive a clock signal.

[0015] According to one aspect of the embodiments of this application, an LED display screen is provided, comprising: Light panel; An array of LED beads is disposed on the lamp panel; A driver chip is disposed on the lamp board, and the driver chip is connected to the LED lamp array. The driver chip is used to drive the LED lamp array to emit light. The LED brightness adjustment circuit provided in any embodiment of this application is connected to the driver chip and is used to control the driver chip to adjust the luminous brightness of the LED array.

[0016] In one embodiment of this application, the LED display screen further includes: A receiving card is used to receive the display data of the LED display screen and generate a driving signal based on the display data; The adapter board is connected to the receiving card and the driver chip respectively, and is used to transmit the driving signal to the driver chip so that the driver chip drives the LED lamp array to emit light according to the driving signal.

[0017] In the technical solution provided in this application embodiment, the LED brightness adjustment circuit includes an encoder module for acquiring brightness adjustment information and converting it into a brightness adjustment electrical signal; a control module connected to the encoder module for outputting a brightness control signal based on the brightness adjustment electrical signal; and a brightness adjustment module connected at one end to the control module and at the other end to the driver chip, which outputs the brightness control signal to control the driver chip to adjust the luminous brightness of the LED bead array. Thus, without altering the original structure of the LED display screen, the brightness of the LED display screen can be quickly adjusted via the LED brightness adjustment circuit, reducing reliance on the LED display screen supplier and improving the flexibility of LED brightness adjustment. Furthermore, the LED brightness adjustment circuit only needs to interface with the existing driver chip of the LED display screen, without replacing or modifying the driver chip itself, nor redesigning the power supply circuit of the LED bead array, thus improving the practicality and economy of the solution.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 A schematic diagram of the structure of an LED brightness adjustment circuit provided in one embodiment of this application is shown.

[0021] Figure 2 A schematic diagram of the structure of an encoder module provided in one embodiment of this application is shown.

[0022] Figure 3 A schematic diagram of the structure of a control module provided in one embodiment of this application is shown.

[0023] Figure 4 A schematic diagram of the structure of a brightness adjustment module provided in one embodiment of this application is shown.

[0024] Figure 5 A schematic diagram of the structure of an LED driver chip provided in one embodiment of this application is shown.

[0025] Figure 6 A schematic diagram of the structure of an LED display screen provided in one embodiment of this application is shown. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0027] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0028] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0029] When introducing or demonstrating LED products to users, accurate brightness is one of the criteria for judging the quality of the display. However, the current industry methods for adjusting brightness are relatively limited, relying solely on the equipment and software technology of the LED display supplier. This often requires carrying multiple supplier devices and training personnel to adjust the brightness, significantly increasing the time required for both parties and impacting the simplicity of the demonstration.

[0030] Figure 1 A schematic diagram of an LED brightness adjustment circuit according to an embodiment of this application is shown. This LED brightness adjustment circuit 100 is applied in an LED display screen to adjust the brightness of the LED bead array 220 in the LED display screen, that is, to adjust the brightness of the LED display screen. The LED display screen includes a lamp board, on which an LED bead array and a driver chip UD are provided. The LED bead array 220 is an array composed of multiple LED bead arrays. The LED beads in the LED bead array 220 are driven to emit light by the driver chip UD.

[0031] like Figure 1 As shown, the LED brightness adjustment circuit 100 includes an encoder module 110, a control module 120, and a brightness adjustment module 130. The encoder module 110 acquires brightness adjustment information and converts it into a brightness adjustment electrical signal. The brightness adjustment information can be generated by user operation; for example, if a brightness adjustment button is provided on the encoder module 110, the user triggering the button will generate brightness adjustment information.

[0032] The control module 120 is connected to the encoder module 110 and is used to output a brightness control signal based on the brightness adjustment electrical signal. The control module 120 acts as a signal converter, outputting the brightness adjustment electrical signal as a brightness control signal for subsequent circuit modules to achieve brightness adjustment.

[0033] One end of the brightness adjustment module 130 is connected to the control module 120, and the other end is connected to the driver chip UD. The brightness adjustment module 130 is used to control the driver chip UD to adjust the brightness of the LED array 220 according to a brightness control signal. For example, the brightness adjustment module 130 can output a current adjustment signal to the driver chip UD according to the brightness control signal, and the driver chip UD adjusts the current in the LED array 220 according to the current adjustment signal, thereby achieving brightness adjustment of the LED array 220. As another example, the brightness adjustment module 130 can adjust the value of the resistor connected to the driver chip UD according to the brightness control signal, and the driver chip UD adjusts the current in the LED array 220 according to the value of the connected resistor, thereby achieving brightness adjustment of the LED array 220 by adjusting the resistance value.

[0034] In conventional LED brightness adjustment methods, manufacturers adjust the current in the LED chips by changing the value of the resistor connected to the driver chip UD, thereby adjusting the brightness. However, once an LED display screen leaves the factory, its structure and internal circuitry are fixed. Therefore, to adjust the brightness, the LED display screen needs to be disassembled to change the value of the resistor connected to the driver chip UD. This adjustment method is time-consuming, labor-intensive, and may damage the LED display screen.

[0035] The LED brightness adjustment circuit 100 of this application can be designed independently without changing the internal circuit and structure of the LED display screen. In use, it can be connected to the driver chip UD to adjust the brightness of the LED display screen.

[0036] In the technical solution provided in this application embodiment, the LED brightness adjustment circuit includes an encoder module for acquiring brightness adjustment information and converting it into a brightness adjustment electrical signal; a control module connected to the encoder module for outputting a brightness control signal based on the brightness adjustment electrical signal; and a brightness adjustment module connected at one end to the control module and at the other end to the driver chip, which outputs the brightness control signal to control the driver chip to adjust the luminous brightness of the LED bead array. Thus, without altering the original structure of the LED display screen, the brightness of the LED display screen can be quickly adjusted via the LED brightness adjustment circuit, reducing reliance on the LED display screen supplier and improving the flexibility of LED brightness adjustment. Furthermore, the LED brightness adjustment circuit only needs to interface with the existing driver chip of the LED display screen, without replacing or modifying the driver chip itself, nor redesigning the power supply circuit of the LED bead array, thus improving the practicality and economy of the solution.

[0037] Figure 2 A schematic diagram of the encoder module provided in one embodiment of this application is shown. Figure 2As shown, the encoder module 110 includes a knob structure 111 and an encoder disk 112 connected to the knob structure 111. The knob structure 111 is used to acquire brightness adjustment information, and the encoder disk 112 is used to convert the brightness adjustment information into a brightness adjustment electrical signal. The knob structure 111 is a physical structure that can be rotated and pressed.

[0038] In one embodiment, such as Figure 2 As shown, the encoder disk 112 includes a first signal terminal A, a second signal terminal B, and a third signal terminal C. The first signal terminal A and the second signal terminal B are connected to the knob structure 111 and the control module 120, and the third signal terminal C is grounded. When the knob structure 111 rotates, the first signal terminal A and the second signal terminal B output brightness adjustment electrical signals to the control module 120 based on the rotation angle of the knob structure 111. Specifically, when the knob structure 111 rotates, there is a phase difference between the first signal terminal A and the second signal terminal B. This phase difference is equivalent to a brightness adjustment electrical signal, which is output to the control module 120 through these two pins. The signal output by the first signal terminal A is denoted as the first electrical signal SW1_L, and the signal output by the second signal terminal B is denoted as the second electrical signal SW1_R.

[0039] In one embodiment, such as Figure 2 As shown, the encoder disk 112 includes a fourth signal terminal D and a fifth signal terminal E. The fourth signal terminal E is connected to the knob structure 111 and the control module 120, and the fifth signal terminal E is grounded. When the knob structure 111 is pressed, the fourth signal terminal D outputs a current resistance value storage signal SW1_A to the control module 120. That is, the LED brightness adjustment circuit provided in this embodiment also has a brightness storage function. When the user presses the knob structure 111, the control module 120 can store the phase difference between the first signal terminal A and the second signal terminal B corresponding to the current rotation angle of the knob structure 111. This phase difference defines the resistance value currently output by the brightness adjustment module 120 to the driver chip. Therefore, the current resistance value storage signal SW1_A is used to store the resistance value corresponding to the current phase difference. The driver chip can drive the LED beads to emit light based on a certain resistance value and the brightness corresponding to that resistance value. This means that a rotation angle of the knob structure 111 actually corresponds to a certain LED brightness. When the user presses the knob structure 111, storing the current resistance value is equivalent to storing the current LED brightness. In this embodiment, the brightness can be preserved even if the display screen is powered off.

[0040] Figure 3 A schematic diagram of the structure of a control module provided in one embodiment of this application is shown. Figure 3As shown, the control module 120 includes a control chip U1 and first pull-up resistors RSE1, RSE2, and RSE3. The control chip D1 includes a first input terminal P3.2, a second input terminal P3.4, a third input terminal P3.8, and an output terminal P1.3. The first input terminal P3.2 is connected to the first signal terminal A in the encoder module 110, the second input terminal P3.4 is connected to the second signal terminal B, the third input terminal P3.8 is connected to the fourth signal terminal D, and the output terminal P1.3 is connected to the brightness adjustment module 130. Specifically, the first input terminal P3.2 of the control chip D1 is chip pin 13, the second input terminal P3.4 is chip pin 15, the third input terminal P3.8 is chip pin 17, and the output terminal P1.3 is chip pin 2.

[0041] One end of the first pull-up resistor RSE1 is connected to the first input terminal P3.2, and the other end is connected to the operating power supply VCC; one end of the second pull-up resistor RSE2 is connected to the second input terminal P3.4, and the other end is connected to the operating power supply VCC; one end of the third pull-up resistor RSE3 is connected to the third input terminal P3.8, and the other end is connected to the operating power supply VCC. By connecting the first input terminal P3.2, the second input terminal P3.4, and the third input terminal P3.8 to the corresponding pull-up resistors, signal interference in the circuit can be reduced, and logical misjudgments can be avoided.

[0042] In one embodiment, such as Figure 3 As shown, the control chip U1 also includes pins 11-12, which are used for chip programming to write control programs into the chip.

[0043] Figure 4 A schematic diagram of the structure of a brightness adjustment module provided in one embodiment of this application is shown. Figure 4 As shown, the brightness adjustment module 130 includes at least one digital potentiometer SOT, which is connected to the control module 120. Each digital potentiometer SOT is connected to a driver chip UD.

[0044] In one embodiment, such as Figure 4 As shown, the brightness adjustment module 130 also includes an adjustment resistor R, which is connected to a digital potentiometer SOT. For example, Figure 4 Two digital potentiometers SOT and two adjustable resistors R are shown, denoted as digital potentiometers UA1 and UA2, and adjustable resistors R1 and R2. The specific structure of digital potentiometers UA1 and adjustable resistors R1 is described below as an example.

[0045] In one embodiment, such as Figure 4As shown, the digital potentiometer UA1 includes a data input terminal SDI, a signal output terminal W, a first resistor terminal A, and a second resistor terminal B. The data input terminal SDI is connected to the control module 120, as shown below. Figure 3 The control module 120 shown has its data input terminal SDI connected to the output terminal P1.3 (pin 2) of the control chip U1. The signal output terminal W is connected to the driver chip UD. The first resistor terminal A is grounded through an adjustable resistor R1, and the second resistor terminal B is grounded. The digital potentiometer UA1 adjusts the position of the signal output terminal W relative to either the first resistor terminal A or the second resistor terminal B according to the brightness control signal, so that the signal output terminal W outputs a resistance value to the driver chip UD that matches the brightness control signal.

[0046] In one embodiment, such as Figure 4 As shown, the digital potentiometer UA1 also includes a chip select terminal CS# and a clock terminal CLK. The chip select terminal CS# is connected to the control module 120 and is used to receive the chip select signal; the clock terminal CLK is connected to the control module 120 and is used to receive the clock signal. The chip select terminal CS# is an active-low signal used to activate the communication function of the digital potentiometer UA1. When the chip select terminal CS# is high, the digital potentiometer UA1 is in an idle state and does not respond to any input signals; when the chip select terminal CS# is pulled low (low level), the digital potentiometer UA1 is activated and selected, and begins to receive and parse signals from the data input terminal SDI and the clock terminal CLK. Generally, the signal from the data input terminal SDI needs to be transmitted synchronously with the clock signal from the clock terminal CLK. The signal from the data input terminal SDI is usually sampled at the rising or falling edge of the clock signal from the clock terminal CLK.

[0047] In one embodiment, such as Figure 3 and Figure 4 As shown, the control chip U1 also includes a chip select output terminal P1.6 (i.e. chip pin 5) and a clock output terminal P1.5 (i.e. chip pin 6). The chip select terminal CS# of the digital potentiometer UA1 is connected to the chip select output terminal P1.6 of the control chip U1, and the chip clock terminal CLK of the digital potentiometer UA1 is connected to the clock output terminal P1.5 of the control chip U1.

[0048] In one embodiment, such as Figure 3 and Figure 4 As shown, when there are multiple digital potentiometers, the data input terminals SDI and clock terminals CLK of each potentiometer can be connected to the corresponding output terminals P1.3 (pin 2) and P1.5 (pin 6) of the control chip U1. The chip select terminals CS# of each potentiometer can be connected to the chip select output terminal P1.6 of the control chip U1. It can be understood that the control chip U1 can also include multiple chip select output terminals, which can be used to connect to the chip select terminals CS# of multiple digital potentiometers respectively. Figure 4 As shown, the control chip U1 includes a chip select output terminal P1.6 and a chip select output terminal P1.7. The chip select output terminal P1.6 can be used to connect to the chip select terminal CS# (receive signal CS1) of the digital potentiometer U1, and the chip select output terminal P1.7 can be used to connect to the chip select terminal CS# (receive signal CS2) of the digital potentiometer U2.

[0049] Figure 5 A schematic diagram of the structure of an LED driver chip according to an embodiment of this application is shown. Wherein, Figure 5 Two LED driver chips are shown, namely driver chip UD1 and driver chip UD2. The following describes the implementation of the technical solution of this application using driver chip UD1.

[0050] In one embodiment, such as Figure 4 and Figure 5 As shown, the signal output terminal W of the digital potentiometer UA1 is connected to the R-EXT pin (i.e., pin 23) of the driver chip UD1. The signal RW1 output from the signal output terminal W of the digital potentiometer UA1 is the brightness control signal, indicating a resistance value. This signal is transmitted to the R-EXT pin of the driver chip UD1, allowing the driver chip UD1 to determine its external resistance, thereby adjusting the current output to the LED beads and thus regulating the brightness of the LED beads. Pins 13-20 of the driver chip UD1 can all be used to connect to the LED bead array 220. The driver chip UD1 senses changes in the connected resistance through pin 23 and adjusts the current output from pins 13-20 according to the resistance connected to pin 23, thereby achieving the purpose of adjusting the brightness of the LED bead array 220.

[0051] Figure 6 A schematic diagram of the structure of an LED display screen provided in one embodiment of this application is shown.

[0052] like Figure 6 As shown, the LED display screen 200 includes an LED brightness adjustment circuit 100, a lamp board 210, an LED bead array 220, and a driver chip UD. Multiple LED bead arrays 220 are mounted on the lamp board 210. The driver chip UD is also mounted on the lamp board 210. The driver chip UD is connected to the LED bead arrays 220, driving these LEDs to emit light. The driver chip UD typically adjusts the current output to the LED bead arrays 220 based on the value of its external resistor; the magnitude of this current affects the brightness of the LED bead arrays 220.

[0053] Therefore, in conventional LED brightness adjustment methods, manufacturers adjust the brightness of the LED array 220 by changing the value of the external resistor of the chip. However, when the LED display is manufactured, the external resistor of the chip is fixed. Thus, to adjust the brightness, the LED display needs to be unpacked to change the value of the external resistor of the chip. This adjustment method is time-consuming and labor-intensive, and may damage the LED display.

[0054] In this embodiment, the LED display screen also includes an LED brightness adjustment circuit 100, which can be connected to a driver chip UD. This allows the driver chip UD to output a control signal to adjust the brightness of the LED array 220. For example, outputting a current adjustment signal to the driver chip UD causes it to adjust the current flowing through the LED array 220, thereby achieving brightness adjustment.

[0055] In this embodiment, the control signal output by the LED brightness adjustment circuit 100 to the driver chip UD is a resistance adjustment signal. That is, the driver chip UD senses a change in the resistance used to adjust the current of the LED bead array 220, thereby adjusting the current of the LED bead array 220 based on the resistance change, and thus achieving brightness adjustment. The LED brightness adjustment circuit 100 is any LED brightness adjustment circuit provided in any embodiment of this application, and will not be repeated here.

[0056] In one embodiment, the LED brightness adjustment circuit 100 is connected to the driver chip UD, such that the external resistor connected to the driver chip UD is the output resistance of the LED brightness adjustment circuit 100. Therefore, when the output voltage of the LED brightness adjustment circuit 100 increases, the external resistance of the chip will increase synchronously; when the output voltage of the LED brightness adjustment circuit 100 decreases, the external resistance of the chip will decrease synchronously.

[0057] In one embodiment, such as Figure 6 As shown, the LED display screen 200 also includes a receiver card 230 and an adapter board 240. The receiver card 230 is connected to the adapter board 240, and the adapter board 240 is connected to the driver chip UD on the lamp board 210. The receiver card 230 is used to receive display data from the LED display screen 200 and convert the display data into drive signals that the display screen can understand. The adapter board 240 is used to process the drive signals into instructions that the driver chip UD can recognize and send them to the driver chip UD so that the driver chip UD drives the LED lamp array 220 to display the corresponding data.

[0058] In one embodiment, the encoder module 110 in the LED brightness adjustment circuit 100 is disposed on the adapter plate 240. The control module 120 and the brightness adjustment module 130 in the LED brightness adjustment circuit 100 are disposed on the lamp board 210.

[0059] The LED display screen 200 provided in this application can quickly and conveniently adjust the brightness of the LED display screen through the knob set in the encoder module 110. It is especially suitable for quick brightness adjustment in display screen rental scenarios or outdoor display scenarios, such as when introducing or demonstrating products to customers, the brightness of the LED display screen can be quickly adjusted by the knob.

[0060] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0061] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An LED brightness adjustment circuit, characterized in that, The LED display screen includes a driver chip and an array of LED beads connected to the driver chip, wherein the driver chip is used to drive the array of LED beads to emit light. The LED brightness adjustment circuit includes: The encoder module is used to acquire brightness adjustment information and convert the brightness adjustment information into a brightness adjustment electrical signal; The control module, connected to the encoder module, is used to output a brightness control signal according to the brightness adjustment electrical signal; The brightness adjustment module is connected to the control module at one end and to the driver chip at the other end. The brightness adjustment module is used to control the driver chip to adjust the luminous brightness of the LED lamp bead array according to the brightness control signal.

2. The LED brightness adjustment circuit according to claim 1, characterized in that, The encoder module includes a knob structure and an encoder disk connected to the knob structure. The knob structure is used to acquire brightness adjustment information, and the encoder disk is used to convert the brightness adjustment information into a brightness adjustment electrical signal.

3. The LED brightness adjustment circuit according to claim 2, characterized in that, The encoder includes a first signal terminal, a second signal terminal, and a third signal terminal. The first signal terminal and the second signal terminal are connected to the knob structure and to the control module, and the third signal terminal is grounded. When the knob structure is rotated, the first signal terminal and the second signal terminal output the brightness adjustment electrical signal to the control module based on the rotation angle of the knob structure.

4. The LED brightness adjustment circuit according to claim 3, characterized in that, The encoder includes a fourth signal terminal and a fifth signal terminal. The fourth signal terminal is connected to the knob structure and the control module, and the fifth signal terminal is grounded. When the knob structure is pressed, the fourth signal terminal outputs a current resistance value storage signal to the control module.

5. The LED brightness adjustment circuit according to claim 4, characterized in that, The control module includes a control chip, a first pull-up resistor, a second pull-up resistor, and a third pull-up resistor. The control chip includes a first input terminal, a second input terminal, a third input terminal, and an output terminal. The first input terminal is connected to the first signal terminal, the second input terminal is connected to the second signal terminal, the third input terminal is connected to the fourth signal terminal, and the output terminal is connected to the brightness adjustment module. One end of the first pull-up resistor is connected to the first input terminal, and the other end is connected to the operating power supply; one end of the second pull-up resistor is connected to the second input terminal, and the other end is connected to the operating power supply; one end of the third pull-up resistor is connected to the third input terminal, and the other end is connected to the operating power supply.

6. The LED brightness adjustment circuit according to claim 1, characterized in that, The brightness adjustment module includes at least one digital potentiometer, and each of the at least one digital potentiometer is connected to the control module, with each digital potentiometer connected to one of the driver chips.

7. The LED brightness adjustment circuit according to claim 6, characterized in that, The brightness adjustment module further includes an adjustment resistor; the digital potentiometer includes a data input terminal, a signal output terminal, a first resistor terminal, and a second resistor terminal. The data input terminal is connected to the control module, the signal output terminal is connected to the driver chip, the first resistor terminal is grounded through the adjustment resistor, and the second resistor terminal is grounded. The digital potentiometer adjusts the position of the signal output terminal relative to the first or second resistor terminal according to the brightness control signal, so that the signal output terminal outputs a resistance value to the driver chip that matches the brightness control signal.

8. The LED brightness adjustment circuit according to claim 7, characterized in that, The digital potentiometer also includes a chip select terminal and a clock terminal. The chip select terminal is connected to the control module and is used to receive a chip select signal; the clock terminal is connected to the control module and is used to receive a clock signal.

9. An LED display screen, characterized in that, include: Light panel; An array of LED beads is disposed on the lamp panel; A driver chip is disposed on the lamp board, and the driver chip is connected to the LED lamp array. The driver chip is used to drive the LED lamp array to emit light. The LED brightness adjustment circuit according to any one of claims 1-8, wherein the LED brightness adjustment circuit is connected to the driver chip and is used to control the driver chip to adjust the luminous brightness of the LED bead array.

10. The LED display screen according to claim 9, characterized in that, The LED display screen also includes: A receiving card is used to receive the display data of the LED display screen and generate a driving signal based on the display data; The adapter board is connected to the receiving card and the driver chip respectively, and is used to transmit the driving signal to the driver chip so that the driver chip drives the LED lamp array to emit light according to the driving signal.

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