Display circuit and interactive large screen

Abstract

The utility model relates to the technical field of interactive large screens, and discloses a display circuit and an interactive large screen. The display circuit comprises a signal conversion unit, a plurality of lamp beads and a plurality of lamp bead modulation units, each lamp bead is electrically connected with the corresponding lamp bead modulation unit, all the lamp bead modulation units are electrically connected with the signal conversion unit, and the signal conversion unit is used for being electrically connected with a mainboard. The signal conversion unit is used for receiving a first control signal which is sent by the mainboard and is used for representing the running state of the interactive large screen, converting the first control signal into a second control signal and sending the second control signal to the plurality of lamp bead modulation units, and the lamp bead modulation units are used for controlling corresponding lamp beads according to the second control signal. By adopting the display circuit provided by the embodiment of the invention, the running state of the interactive large screen can be reflected in real time through the state of the lamp beads. Due to the real-time performance, the user can visually see the operation condition of the large screen, the interactivity is enhanced, and the deep requirements of the user for information acquisition and experience feeling are met.

Description

Technical Field

[0001] The present application relates to the technical field of interactive large screens, and in particular to a display circuit and an interactive large screen. Background Art

[0002] With the continuous advancement and development of interactive large-screen technology, customers' demands for interactive experiences are becoming increasingly demanding. While the interactive large-screen displays currently on the market offer powerful functionality, their interaction methods are relatively simple, typically limited to conveying the screen's operating status and information through the display of on-screen content. This interaction method lacks intuitiveness and interactivity, making it difficult to meet users' deeper needs for information acquisition and immersive experiences. Utility Model Content

[0003] The embodiments of the present application provide a display circuit and an interactive large screen, which can solve the problem that the existing interactive large screens have a single interaction mode, lack intuitiveness and interactivity, and are difficult to meet users' deep needs for information acquisition and experience.

[0004] In a first aspect, an embodiment of the present application provides a display circuit for use in an interactive large screen, comprising a signal conversion unit, a plurality of lamp beads, and a plurality of lamp bead modulation units, each of the lamp beads being electrically connected to a corresponding lamp bead modulation unit, all of the lamp bead modulation units being electrically connected to the signal conversion unit, and the signal conversion unit being electrically connected to a mainboard in the interactive large screen;

[0005] The signal conversion unit is used to receive a first control signal sent by the mainboard for characterizing the operating status of the interactive large screen, convert the first control signal into a second control signal and send it to multiple lamp bead modulation units, and the lamp bead modulation unit is used to control the corresponding lamp beads according to the second control signal.

[0006] In a possible implementation of the first aspect, the lamp bead modulation unit includes a first modulation resistor, a second modulation resistor and a switching device, the first end of the first modulation resistor and the first end of the second modulation resistor are both electrically connected to the signal conversion unit, the second end of the first modulation resistor is respectively electrically connected to the cathode of the lamp bead and the first conduction end of the switching device, the second end of the second modulation resistor is electrically connected to the control end of the switching device, and the second conduction end of the switching device is grounded.

[0007] In a possible implementation of the first aspect, the switching device is a transistor, the base of the transistor serves as the control end of the switching device and is electrically connected to the second end of the second modulation resistor, the collector of the transistor serves as the first conduction end of the switching device and is respectively electrically connected to the cathode of the lamp bead and the second end of the first modulation resistor, and the emitter of the transistor serves as the second conduction end of the switching device and is grounded.

[0008] In a possible implementation of the first aspect, the lamp bead modulation unit further includes a first resistor, a first end of the first resistor is used to be electrically connected to a power supply, and a second end of the first resistor is electrically connected to an anode of the lamp bead.

[0009] In a possible implementation of the first aspect, the signal conversion unit includes a control chip, the control chip is electrically connected to all the lamp bead modulation units via a flexible flat cable, and the control chip is used to be electrically connected to the mainboard.

[0010] In a possible implementation manner of the first aspect, the lamp beads include at least two colors.

[0011] In a possible implementation of the first aspect, all the lamp beads are evenly distributed on both sides of the camera of the interactive large screen.

[0012] In a possible implementation of the first aspect, the display circuit also includes a voltage conversion unit, which is electrically connected to the mainboard and the signal conversion unit respectively, and the voltage conversion unit is used to convert the first voltage output by the mainboard into a second voltage and transmit the second voltage to the signal conversion unit.

[0013] In a possible implementation of the first aspect, the voltage conversion unit includes a voltage conversion chip, an input end of the voltage conversion chip is electrically connected to the mainboard, and an output end of the voltage conversion chip is electrically connected to the signal conversion unit.

[0014] In a second aspect, an embodiment of the present application provides an interactive large screen, comprising the display circuit described in any one of the first aspects.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0016] The display circuit provided in the embodiment of the present application includes a signal conversion unit, a plurality of lamp beads and a plurality of lamp bead modulation units. Each lamp bead is electrically connected to the corresponding lamp bead modulation unit, and all lamp bead modulation units are electrically connected to the signal conversion unit. The main board can output a first control signal representing the operating status of the interactive large screen. The signal conversion unit converts the first control signal to obtain a second control signal, and sends the second control signal to the plurality of lamp bead modulation units. After receiving the second control signal, the lamp bead modulation unit controls the corresponding lamp bead according to the second control signal to achieve modulation of the lamp bead, such as adjusting the brightness, color or flashing frequency of the lamp bead. It can be seen from this that the display circuit provided in the embodiment of the present application, the signal conversion unit can control the lamp bead according to the first control signal, that is, the operating status of the interactive large screen can be reflected in real time through the status of the lamp bead. This real-time performance allows users to intuitively see the operating status of the large screen, enhances interactivity, and meets the user's deep-seated needs for information acquisition and experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical features of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is the principle frame of the display circuit provided by this application Figure 1 ;

[0019] Figure 2 is a circuit connection diagram of the display unit provided in this application;

[0020] Figure 3 It is a structural diagram of the signal conversion unit provided by this application;

[0021] Figure 4 This is a schematic diagram of the camera circuit connection provided by this application;

[0022] Figure 5 This is a schematic diagram of the mainboard circuit connection provided by this application;

[0023] Figure 6 This is a schematic diagram of the debugging circuit connection of the signal conversion unit provided in this application;

[0024] Figure 7 A schematic diagram of the program update circuit connection of the signal conversion unit provided in this application;

[0025] Figure 8 This is a schematic diagram of the crystal oscillator circuit connection of the signal conversion unit provided in this application;

[0026] Figure 9 This is a schematic diagram of the reset circuit connection of the signal conversion unit provided in this application;

[0027] Figure 10 This is a schematic diagram of the connection of the decoupling capacitor circuit provided by the present application and placed close to the signal conversion unit;

[0028] Figure 11 Schematic diagram of the relative position structure of the lamp beads and the interactive large screen provided in this application;

[0029] Figure 12 This is the principle frame of the display circuit provided by this application Figure 2 ;

[0030] Figure 13 This is a circuit connection diagram of the voltage conversion unit provided in this application. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes, and effects of the present application, the specific embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and Examples. The following examples are only used to illustrate the present application, but are not used to limit the scope of protection of the present application. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without paying creative work should all fall within the scope of protection of the present application.

[0032] In the description of this application, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting this application.

[0033] In the description of this application, it should be understood that the numbers themselves, such as "first", "second", etc., are only used to distinguish the objects described, and have no sequential or technical meaning, and cannot be understood as stipulating or implying the importance of the objects described.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] In this application, the term "plurality" refers to two or more than two. Furthermore, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0036] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. Those of ordinary skill in the art will understand the specific meanings of the above terms in this application in specific circumstances.

[0037] While the interactive large screens currently on the market offer powerful functionality, their interaction methods are relatively limited, typically limited to conveying the screen's operating status and information through the display of on-screen content. This interaction method lacks intuitiveness and interactivity, making it difficult to meet users' deeper needs for information acquisition and user experience.

[0038] In order to solve the above technical problems, the present application provides a display circuit 10, see Figure 1 As shown, the display circuit 10 is applied to an interactive large screen. The display circuit 10 includes a signal conversion unit 101, multiple lamp beads and multiple lamp bead modulation units 102. Each lamp bead is electrically connected to the corresponding lamp bead modulation unit 102. All lamp bead modulation units 102 are electrically connected to the signal conversion unit 101. The signal conversion unit 101 is used to be electrically connected to the main board 20 in the interactive large screen.

[0039] Specifically, the mainboard 20 can output a first control signal representing the operating status of the interactive large screen, and the signal conversion unit 101 converts the first control signal to obtain a second control signal, and sends the second control signal to multiple lamp bead modulation units 102. After receiving the second control signal, the lamp bead modulation unit 102 controls the corresponding lamp beads according to the second control signal to achieve modulation of the lamp beads, such as adjusting the brightness, color or flashing frequency of the lamp beads. It can be seen that the display circuit 10 provided in the embodiment of the present application, the signal conversion unit 101 can control the lamp beads according to the first control signal, that is, the operating status of the interactive large screen can be reflected in real time through the status of the lamp beads. This real-time performance allows users to intuitively see the operating status of the large screen, enhances interactivity, and meets the user's deep-seated needs for information acquisition and experience.

[0040] It should be noted that the interactive large screen may be equipped with various sensors (such as touch screen sensors, cameras or buttons, etc.) and input devices to monitor and collect user behavior and environmental data. The data collected by these sensors and input devices will be sent to the processor built into the interactive large screen for preliminary processing. The processed data will then be transmitted to the mainboard 20. The chipset or graphics processing unit on the mainboard 20 will receive this data and further process it to drive the interactive large screen and output a first control signal representing the operating status of the interactive large screen.

[0041] In one embodiment of the present application, Figure 2 As shown, the lamp bead modulation unit 102 includes a first modulation resistor, a second modulation resistor and a switching device. The first end of the first modulation resistor and the first end of the second modulation resistor are both electrically connected to the signal conversion unit 101, the second end of the first modulation resistor is electrically connected to the cathode of the lamp bead and the first conduction end of the switching device, respectively, the second end of the second modulation resistor is electrically connected to the control end of the switching device, and the second conduction end of the switching device is grounded.

[0042] Specifically, Figure 2 The circuit includes 10 green lamp beads D1 to D10 and 10 red lamp beads D11 to D20. The resistor connected to the cathode of the lamp bead is the first modulation resistor, that is, R11 to R20 and R41 to R50 are all first modulation resistors. Among them, R11 to R20 are the first modulation resistors of the green lamp beads D1 to D10, respectively, and R41 to R50 are the first modulation resistors of the red lamp beads D11 to D20, respectively. The first modulation resistor is electrically connected to the signal conversion unit 101, and can receive the second control signal output by the signal conversion unit 101 and modulate the corresponding lamp bead according to the second control signal. Figure 2 The resistor connected to the control terminal of the switching device is the second modulation resistor, that is, R21~R30 and R51~R60 are all second modulation resistors. Among them, R21~R30 are the second modulation resistors of the green lamp beads D1~D10 respectively, and R51~R60 are the second modulation resistors of the red lamp beads D11~D20 respectively. The second modulation resistor is electrically connected to the signal conversion unit 101, and can receive the second control signal output by the signal conversion unit 101 and transmit the second control signal to the control terminal of the switching device. The switching device is turned on according to the second control signal, thereby modulating the corresponding lamp bead.

[0043] For example, the resistance of the first modulation resistor can be set to a relatively low value, for example, the resistance of all first modulation resistors can be set to 0 ohm. The resistance of the second modulation resistor can be set to a relatively high value, for example, the resistance of all second modulation resistors can be set to 10k ohm.

[0044] In one embodiment of the present application, Figure 2As shown, the switching device is a transistor, the base of the transistor serves as the control end of the switching device and is electrically connected to the second end of the second modulation resistor, the collector of the transistor serves as the first conduction end of the switching device and is electrically connected to the cathode of the lamp bead and the second end of the first modulation resistor respectively, and the emitter of the transistor serves as the second conduction end of the switching device and is grounded.

[0045] Specifically, Figure 2 Q1 to Q20 are all triodes. The second control signal output by the signal conversion unit 101 can be transmitted to the base of the triode. The triode is turned on according to the second control signal, thereby modulating the corresponding lamp bead.

[0046] For example, the type and model of the lamp beads can be selected, for example, LED lamp beads can be selected, and the model of the lamp beads can be selected as LED0603. The type and model of the transistor can be selected, for example, the transistor can be selected as NPN transistor, and the model of the transistor can be selected as MMBT3904.

[0047] It should be noted that if the lamp beads meet the first condition, where the first condition is that the brightness requirement of the selected lamp beads is low and the required driving current is small. At this time, the signal conversion unit 101 outputs a low-level signal, which can make the lamp beads light up. Since the brightness requirement of the lamp beads is low, the signal conversion unit 101 directly drives the lamp beads to light up. The circuit is simple and the number of components used is small, which can reduce overall energy consumption and cost. At the same time, the driving current required by the lamp beads is small, which can reduce the heat generated by the lamp beads, help reduce the junction temperature of the lamp beads, and extend the service life of the lamp beads.

[0048] It should be noted that if the lamp bead meets the second condition, wherein the second condition is that the brightness requirement of the selected lamp bead is relatively high, and the required driving current is relatively large. At this time, the signal conversion unit 101 outputs a high-level signal, which can turn on the transistor, so that the lamp bead is powered and lights up. Since the brightness requirement of the lamp bead is relatively high, the signal conversion unit 101 can provide sufficient current to meet the high brightness requirement of the lamp bead by controlling the conduction of the transistor and then driving the lamp bead to light up, ensuring that the lamp bead can reach the expected brightness level. The brightness of the lamp bead can also be precisely controlled by adjusting the level control signal, realizing multi-level adjustment from dark to bright, and improving the flexibility of use. At the same time, the signal conversion unit 101 can also avoid burning the control pin of the signal conversion unit 101 ( Figure 2 GREEN1 to GREEN10 pins and RED1 to RED10 pins in the PCB).

[0049] In one embodiment of the present application, Figure 2As shown, the lamp bead modulation unit 102 further includes a first resistor, a first end of the first resistor is used to be electrically connected to the power supply, and a second end of the first resistor is electrically connected to the anode of the lamp bead.

[0050] Specifically, Figure 2 The resistor connected between the power supply and the anode of the lamp bead is the first resistor, namely R1-R10 and R31-R40. The first resistor, placed between the power supply and the anode of the lamp bead, prevents excessive current from flowing and damaging the lamp bead. Especially when the power supply voltage exceeds the rated voltage of the lamp bead, the first resistor limits the current, preventing the lamp bead from burning out due to overcurrent.

[0051] For example, the resistance of the first resistor can be selected, for example, the resistance of R1 to R10 can be set to 470 ohms, and the resistance of R31 to R40 can be set to 330 ohms. The voltage of the power supply can be selected to be 3.3V.

[0052] It should be noted that, from the above, there are two driving modes for the lamp beads, among which the first driving mode is: the signal conversion unit 101 directly drives the lamp beads to light up. The lamp bead modulation unit 102 includes a first resistor, a lamp bead and a first modulation resistor. The second driving mode is: the signal conversion unit 101 drives the lamp bead to light up by controlling the conduction of the transistor. The lamp bead modulation unit 102 includes a first resistor, a lamp bead, a second modulation resistor and a transistor. When the brightness requirement of the selected lamp bead is low and the required driving current is small, the first driving mode is used to drive the lamp bead. When the brightness requirement of the selected lamp bead is high and the required driving current is large, the second driving mode is used to drive the lamp bead.

[0053] In one embodiment of the present application, Figure 3 As shown, the signal conversion unit 101 includes a control chip U1 , which is electrically connected to all the lamp bead modulation units 102 via a flexible flat cable. The control chip U1 is used to be electrically connected to the mainboard 20 .

[0054] Specifically, Figure 3PINs 2 to 4, 8 to 11, 14 to 16, 17, 20 to 27, 33 to 41, 44, 45, 50 to 57, 61, and 62 all serve as control pins for the signal conversion unit 101. The 20 lamp bead modulation units 102 are electrically connected to the corresponding control pins via flexible flat cables. Using flexible flat cables to connect the lamp bead modulation units 102 and the control pins of the signal conversion unit 101 ensures the stability and reliability of control signal transmission. Furthermore, because the flexible flat cables can be easily bent and twisted, they facilitate wiring within limited space. Furthermore, the cost of the flexible flat cables is relatively low, reducing the design cost of the display circuit 10.

[0055] For example, the control chip U1 can be a GD32F303RGT6. The GD32F303RGT6 chip has high-performance processing capabilities, capable of quickly processing complex control algorithms and data. Furthermore, the GD32F303RGT6 chip provides a rich set of peripheral interfaces, such as UART, I2C, USB, and multiple control pins, enabling the signal conversion unit 101 to connect and communicate with various external devices. PINs 29 and 30 are serial communication ports connected to the motherboard 20 and are used to receive control signals from the motherboard 20.

[0056] In one embodiment of the present application, Figure 3 As shown, the control chip U1 is further provided with a plurality of communication pins, and the communication pins are all electrically connected to the image acquisition unit.

[0057] Specifically, Figure 3 PIN58 and PIN59 are reserved I2C communication pins, which are electrically connected to the image acquisition unit and can receive the image information collected by the image acquisition unit. After receiving the image information, the control chip U1 can analyze and process the image information, ultimately achieving the purpose of modulating the lamp beads.

[0058] It should be noted that the image acquisition unit may include a camera circuit, wherein the camera circuit is as follows: Figure 4 As shown, the camera circuit is provided with a socket for power supply and data transmission. Among them, the power supply pin is connected to USB-5V, and the data transmission pin is used for data transmission between the motherboard 20 and the signal conversion unit 101. The motherboard 20 circuit is as shown in FIG. Figure 5 As shown, the mainboard 20 circuit is provided with a buckle socket for power supply and data transmission. Among them, the power supply pin is connected to USB-5V, and the data transmission pin is used for data transmission between the camera circuit and the signal conversion unit 101. It should be noted that in Figure 4 and Figure 5The connection relationship, corresponding models and parameters of the resistors and capacitors set in can be obtained according to the circuit diagram shown, and will not be described in detail here.

[0059] It should be noted that this application also provides peripheral circuits connected to other pins of the GD32F303RGT6 chip. Figure 6 It is the debugging circuit of GD32F303RGT6 chip. Figure 7 It is the program update circuit of GD32F303RGT6 chip. Figure 8 This is the crystal oscillator circuit of the GD32F303RGT6 chip. Figure 9 This is the reset circuit of the GD32F303RGT6 chip. Figure 10 The decoupling capacitor circuit is placed close to the GD32F303RGT6 chip. The peripheral circuits connected to other pins of the GD32F303RGT6 chip are all existing circuit structures and will not be described in detail here. Figures 6 to 10 The connection relationship, corresponding models and parameters of the resistors and capacitors set in can be obtained according to the circuit diagram shown, and will not be described in detail here.

[0060] In one embodiment of the present application, the lamp beads include at least two colors.

[0061] Specifically, by configuring lamp beads of at least two colors, the visual effect and the richness of information expression are enhanced, wherein the number of lamp beads of each color can be adjusted according to design requirements.

[0062] For example, the number of lamp beads can be set to 20, and the colors of the lamp beads can be set to red and green, with 10 red lamp beads and 10 green lamp beads.

[0063] In one embodiment of the present application, Figure 11 As shown, all the lamp beads are evenly distributed on both sides of the camera of the interactive large screen.

[0064] Specifically, evenly distributed lamp beads can provide a more consistent and coordinated visual effect, enhance the user's visual experience, and improve the overall aesthetics of the interactive large screen.

[0065] For example, the distance between the lamp beads can be selected according to needs. For example, the spacing between each lamp bead can be selected as 30mm. When the interactive large screen is turned on, the lamp beads are turned on from the middle to both sides in sequence, with an interval of 0.5 seconds. When starting a video conference, the status of the camera is detected. When the camera is turned on, the green lamp bead is controlled to light up, that is, the green light is turned on. When the camera is off, the red lamp bead is controlled to light up, that is, the red light is turned on. It is also possible to control the opening of different numbers of lamp beads according to the direction and distance of the user's speech. When the user is speaking on the left, the lamp bead on the left is turned on. The farther the user is from, the more lamp beads are turned on.

[0066] In one embodiment of the present application, Figure 12 As shown, the display circuit 10 also includes a voltage conversion unit 103, which is electrically connected to the mainboard 20 and the signal conversion unit 101 respectively. The voltage conversion unit 103 is used to convert the first voltage output by the mainboard 20 into a second voltage, and transmit the second voltage to the signal conversion unit 101, thereby driving the signal conversion unit 101 to work.

[0067] Specifically, since the voltage of the mainboard 20 is the first voltage (such as 5V) and the voltage required by the signal conversion unit 101 is the second voltage (3.3V), it is necessary to set a voltage conversion unit 103 between the mainboard 20 and the signal conversion unit 101 to reduce the first voltage so that it reaches the voltage required by the signal conversion unit 101, so as to avoid damage to the signal conversion unit 101 due to excessive voltage.

[0068] In one embodiment of the present application, Figure 13 As shown, the voltage conversion unit 103 includes a voltage conversion chip U2 , an input end of the voltage conversion chip U2 is electrically connected to the mainboard 20 , and an output end of the voltage conversion chip U2 is electrically connected to the signal conversion unit 101 .

[0069] Specifically, the voltage conversion chip U2 is used to step down the first voltage to a second voltage, and transmit the second voltage to the signal conversion unit 101 , thereby driving the signal conversion unit 101 to operate.

[0070] For example, the model of the voltage conversion chip U2 may be LM1117S-3.3V.

[0071] The present application also discloses an interactive large screen, including the above-mentioned display circuit 10. The interactive large screen adopts the above-mentioned display circuit 10 to enable users to intuitively see the operation status of the interactive large screen, enhance interactivity, and meet the user's deep-seated needs for information acquisition and experience.

[0072] Since the processing and functions implemented by the interactive large screen in this embodiment basically correspond to the embodiments, principles and examples of the aforementioned display circuit, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0073] The above is only a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, several equivalent obvious variations and / or equivalent replacements can be made, and these obvious variations and / or equivalent replacements should also be regarded as within the scope of protection of the present application.

Claims

1. A display circuit, characterized in that: Applicable to interactive large screens, including a signal conversion unit, multiple lamp beads and multiple lamp bead modulation units, each of the lamp beads is electrically connected to the corresponding lamp bead modulation unit, all the lamp bead modulation units are electrically connected to the signal conversion unit, and the signal conversion unit is used to be electrically connected to the mainboard in the interactive large screen; The signal conversion unit is used to receive a first control signal sent by the mainboard for characterizing the operating status of the interactive large screen, convert the first control signal into a second control signal and send it to multiple lamp bead modulation units, and the lamp bead modulation unit is used to control the corresponding lamp beads according to the second control signal.

2. The display circuit according to claim 1, wherein: The lamp bead modulation unit includes a first modulation resistor, a second modulation resistor and a switching device, the first end of the first modulation resistor and the first end of the second modulation resistor are both electrically connected to the signal conversion unit, the second end of the first modulation resistor is electrically connected to the cathode of the lamp bead and the first conduction end of the switching device respectively, the second end of the second modulation resistor is electrically connected to the control end of the switching device, and the second conduction end of the switching device is grounded.

3. The display circuit according to claim 2, wherein: The switching device is a transistor, the base of the transistor serves as the control end of the switching device and is electrically connected to the second end of the second modulation resistor, the collector of the transistor serves as the first conduction end of the switching device and is electrically connected to the cathode of the lamp bead and the second end of the first modulation resistor respectively, and the emitter of the transistor serves as the second conduction end of the switching device and is grounded.

4. The display circuit according to claim 2, wherein: The lamp bead modulation unit further includes a first resistor, a first end of the first resistor is used to be electrically connected to a power supply, and a second end of the first resistor is electrically connected to an anode of the lamp bead.

5. The display circuit according to claim 1, wherein: The signal conversion unit includes a control chip, which is electrically connected to all the lamp bead modulation units via a flexible flat cable, and the control chip is used to be electrically connected to the mainboard.

6. The display circuit according to claim 1, wherein: The lamp beads include at least two colors.

7. The display circuit according to claim 1, wherein: All the lamp beads are evenly distributed on both sides of the camera of the interactive large screen.

8. The display circuit according to any one of claims 1 to 7, characterized in that: The display circuit also includes a voltage conversion unit, which is electrically connected to the mainboard and the signal conversion unit respectively. The voltage conversion unit is used to convert a first voltage output by the mainboard into a second voltage and transmit the second voltage to the signal conversion unit.

9. The display circuit according to claim 8, wherein: The voltage conversion unit includes a voltage conversion chip, an input end of the voltage conversion chip is electrically connected to the mainboard, and an output end of the voltage conversion chip is electrically connected to the signal conversion unit.

10. An interactive large screen, characterized in that: The display circuit comprises the display circuit according to any one of claims 1 to 9.

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