Display driving circuit and display device

Abstract

The utility model discloses a display driving circuit and a display device, and relates to the technical field of displays, and the display driving circuit comprises a main control chip, a connecting circuit, a handwriting circuit and a backlight circuit. The connecting circuit is connected with the main control chip and is used for connecting the first display screen and the second display screen; the handwriting circuit is connected with the main control chip and used for receiving a user operation instruction and transmitting the user operation instruction to the main control chip, and the main control chip is used for receiving the user operation instruction and outputting a corresponding control signal; the backlight circuit is connected with the main control chip and used for receiving the control signal and outputting a corresponding adjusting signal to the main control chip, and the main control chip correspondingly adjusts the backlight brightness of the second display screen after receiving the adjusting signal; the display driving circuit aims at improving the use convenience of the display driving circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of displays, in particular to a display driving circuit and a display device. Background Art

[0002] Display driver circuits connect and synchronize two or more displays, transferring information from one display to another for synchronized display. For example, connecting a secondary display to a primary display allows the primary display's content to be displayed on the secondary display. Display driver circuits are widely used in communications equipment, smart homes, consumer electronics, and computer room monitoring.

[0003] However, the conventional display driving circuit cannot control the backlight of the sub-display screen after the sub-display screen is connected to the main display screen, resulting in low convenience in use of the display driving circuit. Utility Model Content

[0004] The main purpose of the present invention is to provide a display driving circuit and a display device, aiming to improve the convenience of use of the display driving circuit.

[0005] To achieve the above-mentioned purpose, the present invention provides a display driving circuit. Optionally, the display driving circuit includes:

[0006] Main control chip;

[0007] A connecting circuit, connected to the main control chip, for connecting the first display screen and the second display screen;

[0008] A handwriting circuit connected to the main control chip, configured to receive user operation instructions and transmit the user operation instructions to the main control chip, wherein the main control chip is configured to receive the user operation instructions and output corresponding control signals;

[0009] The backlight circuit is connected to the main control chip, and is used to receive the control signal and output a corresponding adjustment signal to adjust the backlight brightness of the second display screen accordingly.

[0010] Optionally, the backlight circuit includes a constant current driving circuit.

[0011] Optionally, the constant current drive circuit includes a SY7203 chip and a CON2 chip;

[0012] The ninth pin of the SY7203 chip is connected to one end of the resistor R155, one end of the capacitor C85, the collector of the transistor Q10, and one end of the resistor R152. The base of the transistor Q10 is connected to the capacitor C28 and one end of the resistor R154. The other end of the resistor R155, the other end of the capacitor C85, the emitter of the transistor Q10, and the other end of the capacitor C28 are connected to a common ground. The other end of the resistor R154 is connected to the main control chip through the ONBACKLITE interface, and the other end of the resistor R152 is connected to the main control chip through the ADJBACKLITE interface.

[0013] The second pin of the SY7203 chip is connected to one end of the resistor R203 and the resistor R214, the other end of the resistor R203 is connected to the resistor R221 and one end of the capacitor C25, the resistor R221 is connected to the main control chip via the ADJBACKLITE interface, and the other end of the capacitor C25 is grounded; the other end of the resistor R214 is connected to one end of the resistor R202, one end of the resistor R217, and the CON2 chip via the VLED- interface, and the other ends of the resistor R202 and the resistor R217 share a common ground;

[0014] The eighth pin of the SY7203 chip is connected to the VLED+ of the CON2 chip through the capacitor R210;

[0015] The fourth and fifth pins of the SY7203 chip are connected to the anode of the diode D2, the cathode of the diode D2 is connected to one end of the capacitor C27, one end of the capacitor C166 and one end of the inductor L10, the other ends of the capacitor C27 and the capacitor C166 are grounded, and the other end of the inductor L10 is connected to the CON2 chip through the VLED+ interface; the fourth and fifth pins of the SY7203 chip are also connected to one end of the inductor L12, the other end of the inductor L12 is connected to the seventh pin, one end of the capacitor C125, one end of the capacitor C165 and one end of the inductor L11, the other ends of the capacitor C125 and the capacitor C165 are grounded, and the other end of the inductor L11 is connected to the power supply.

[0016] Optionally, the backlight circuit further includes a backlight adjustment circuit.

[0017] Optionally, the backlight adjustment circuit includes an MP3437GRP chip;

[0018] The eighth pin of the MP3437GRP chip is connected to one end of a capacitor C35. The other end of the capacitor C35 is connected to the sixth pin of the MP3437GRP chip and one end of an inductor L9. The other end of the inductor L9 is connected to the tenth pin of the MP3437GRP chip, one end of a resistor R22, one end of a capacitor C5, one end of a capacitor C4, and one end of a resistor R41. The other end of the resistor R22 is connected to the first pin of the MP3437GRP chip. The other ends of the capacitors C5 and C4 are connected to a common ground. The other end of the resistor R41 is connected to a power supply.

[0019] The ninth pin of the MP3437GRP chip is connected to one end of the resistor R9 and the resistor R10, the other end of the resistor R9 is connected to the tenth pin, the other end of the resistor R10 and one end of the capacitor C16 are grounded, and the other end of the capacitor C16 is connected to the second pin of the MP3437GRP chip;

[0020] The seventh pin of the MP3437GRP chip is connected to one end of capacitor C17, one end of resistor R39, one end of capacitor C10, one end of capacitor C24, one end of capacitor C1, and a power supply; the other end of capacitor C17 is grounded, the other end of resistor R39 is connected to one end of resistor R28 and resistor R8, the other end of resistor R28 is connected to the third pin of the MP3437GRP chip, the other end of resistor R28 is grounded, the other end of capacitor C10 is grounded, and the other ends of capacitor C24 and capacitor C1 share a common ground.

[0021] Optionally, the handwriting circuit includes a display menu circuit and an instruction acquisition circuit, the display menu circuit and the instruction acquisition circuit are connected, and the display menu circuit and the instruction acquisition circuit are connected to the main control chip.

[0022] Optionally, the handwriting circuit includes a SY7152 chip;

[0023] The first pin of the SY7152 chip is connected to the anode of the diode D5 and one end of the inductor L4, and the cathode of the diode D5 is connected to one end of the capacitor C3, one end of the resistor R5, one end of the capacitor C45, one end of the capacitor C58 and the power supply; the other end of the capacitor C3 is connected to the third pin of the SY7152 chip, and the other end of the resistor R5 is connected to the resistor R7 and the third pin of the SY7152 chip; the other end of the inductor L4 is connected to one end of the capacitor C56, one end of the capacitor C2, one end of the resistor R63 and the sixth and fifth pins of the SY7152 chip; the other end of the capacitor 56 and the capacitor C2 are grounded, the resistor R63 is connected to the USB-VCC interface, the fifth pin is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R12 and the fourth pin of the SY7152 chip, and the other end of the resistor R12, the resistor R7, the capacitor C45 and the capacitor C58 are grounded.

[0024] Optionally, the display driving circuit includes a protection circuit.

[0025] Optionally, the connection circuit includes a TYPE-C connection circuit and an HDMI connection circuit.

[0026] The utility model also provides a display device, which includes the above-mentioned display driving circuit.

[0027] In summary, the technical solution of the present invention proposes a display driver circuit that significantly improves the ease of use of the display driver circuit by integrating a main control chip, a connection circuit, a handwriting circuit, and a backlight circuit. Specifically, users can control the display settings by directly inputting instructions on the screen through the handwriting circuit, while the backlight circuit can adjust the backlight brightness of the secondary display screen according to the user's instructions, thereby achieving the best visual effect and energy saving in different environments. In this way, users can easily achieve multi-screen content synchronization and personalized display management without the need for an additional controller, which greatly simplifies the operation process and broadens the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of an embodiment of a display driving circuit provided by the present utility model;

[0030] Figure 2 A schematic structural diagram of an embodiment of a backlight circuit provided by the present utility model;

[0031] Figure 3 A schematic structural diagram of another embodiment of the backlight circuit provided by the present utility model;

[0032] Figure 4 This is a structural diagram of an embodiment of a handwriting circuit provided by the present utility model;

[0033] Figure 5 A schematic structural diagram of an embodiment of a protection circuit provided by the present utility model;

[0034] Figure 6 This is a structural diagram of an embodiment of a TYPE-C connection circuit provided by the present utility model;

[0035] Figure 7 This is a structural diagram of an embodiment of an HDMI connection circuit provided by the present utility model;

[0036] Figure 8 This is a structural diagram of an embodiment of the main control chip provided by the present utility model.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Display driver circuits connect and synchronize two or more displays, transferring information from one display to another for synchronized display. For example, connecting a secondary display to a primary display allows the primary display's content to be displayed on the secondary display. Display driver circuits are widely used in communications equipment, smart homes, consumer electronics, and computer room monitoring.

[0042] However, conventional display driver circuits, when connected to a primary display, lack the ability to control the secondary display's backlight, resulting in poor usability. Specifically, after the secondary display is activated and displays content synchronously with the primary display, its backlight brightness is typically fixed or completely controlled by the secondary display itself. In some scenarios, users cannot flexibly adjust the secondary display's backlight brightness, making it inconvenient to use.

[0043] Therefore, if Figure 1 As shown, the present invention proposes a display driving circuit, aiming to improve the convenience of using the display driving circuit. In this embodiment, the display driving circuit includes a main control chip, a connection circuit, a handwriting circuit and a backlight circuit.

[0044] In this embodiment, if Figure 8 As shown, the main control chip includes multiple connection ports, which are respectively connected to the connection circuit, the handwriting circuit and the backlight circuit to realize signal interaction among the connection circuit, the handwriting circuit and the backlight circuit.

[0045] In this embodiment, a connecting circuit is connected to the main control chip to connect the first and second displays. This circuit enables seamless connection between the first (i.e., primary) and second (i.e., secondary) displays. This allows users to easily connect the secondary display to the primary display, achieving real-time, synchronized display without requiring complex setup.

[0046] It can be understood that the connection circuit may include one or more of a TYPE-C connection circuit, an HDMI connection circuit, an eDP connection circuit, and an HDMI to TYPE-C connection circuit. The above are all commonly used connection ports. The display driving circuit can adapt to most display screen devices through the above interfaces, thus having high ease of use.

[0047] In this embodiment, the handwriting circuit is connected to the main control chip for receiving user operation instructions and transmitting the user operation instructions to the main control chip. The main control chip is used to receive the user operation instructions and output corresponding control signals. Specifically, the handwriting circuit includes a manipulation UI interface for inputting corresponding user operation instructions to the main control chip through the UI interface. For example, the user can input various user operation instructions through the manipulation UI interface to adjust the backlight brightness, change the display mode, etc. In this way, the introduction of the handwriting circuit enables the user to intuitively control the various functions of the display drive circuit, thereby improving the convenience and flexibility of human-computer interaction.

[0048] In this embodiment, the backlight circuit is connected to the main control chip to receive the control signal and output a corresponding adjustment signal to adjust the backlight brightness of the secondary display. Thus, by receiving the control signal from the main control chip, the backlight circuit can dynamically adjust the backlight brightness of the secondary display. This allows users to flexibly adjust the backlight intensity of the secondary display based on actual needs or environmental changes, enhancing user comfort and energy saving.

[0049] It's understood that the backlight circuit works in conjunction with the handwriting circuit. When a user sends backlight brightness adjustment instructions to the main control chip through the handwriting circuit's UI, the main control chip interprets the instructions and sends corresponding control signals to the backlight circuit. Upon receiving these signals, the backlight circuit adjusts the backlight brightness of the secondary display. This allows users to adjust the secondary display's backlight brightness in a simple and intuitive manner based on personal preferences or environmental conditions, greatly improving the usability and user experience of the display driver circuit.

[0050] In summary, the present invention proposes a display driver circuit that significantly improves the ease of use of the display driver circuit by integrating a main control chip, a connection circuit, a handwriting circuit, and a backlight circuit. Specifically, users can control display settings by directly inputting instructions on the screen through the handwriting circuit, while the backlight circuit can adjust the backlight brightness of the secondary display screen according to the user's instructions, thereby achieving optimal visual effects and energy saving in different environments. In this way, users can easily achieve multi-screen content synchronization and personalized display management without the need for an additional controller, greatly simplifying the operation process and broadening the application scenarios.

[0051] In one embodiment, the backlight circuit includes a constant current drive circuit. This circuit ensures that the current of the backlight LED or LCD backlight source remains stable, maintaining consistent backlight brightness regardless of power supply voltage fluctuations and preventing brightness variations caused by voltage fluctuations. Furthermore, by precisely controlling the current, the constant current drive circuit can help reduce unnecessary energy loss and improve the energy efficiency of the entire display system.

[0052] Alternatively, as Figure 2 As shown, the constant current drive circuit includes a SY7203 chip and a CON2 chip; the ninth pin of the SY7203 chip is connected to one end of the resistor R155, one end of the capacitor C85, the collector of the transistor Q10 and one end of the resistor R152, and the base of the transistor Q10 is connected to the capacitor C28 and one end of the resistor R154; the other end of the resistor R155, the other end of the capacitor C85, the emitter of the transistor Q10 and the other end of the capacitor C28 are grounded; the other end of the resistor R154 is connected to the ground through the ON The BACKLITE interface is connected to the main control chip, and the other end of the resistor R152 is connected to the main control chip through the ADJBACKLITE interface; the second pin of the SY7203 chip is connected to one end of the resistor R203 and the resistor R214, the other end of the resistor R203 is connected to the resistor R221 and one end of the capacitor C25, the resistor R221 is connected to the main control chip through the ADJBACKLITE interface, and the other end of the capacitor C25 is grounded; the other end of the resistor R214 is connected to one end of the resistor R202, one end of the resistor R217 and the CON2 chip through the VLED- interface, and the other end of the resistor R202 and the resistor R217 are grounded; the eighth pin of the SY7203 chip is connected to the VLED+ of the CON2 chip through the capacitor R210; the fourth and fifth pins of the SY7203 chip are connected to the anode of the diode D2, and the cathode of the diode D2 is connected to one end of the capacitor C27, one end of the capacitor C166 and the inductor L1 0, the other ends of the capacitor C27 and the capacitor C166 are grounded, and the other end of the inductor L10 is connected to the CON2 chip through the VLED+ interface; the fourth pin and the fifth pin of the SY7203 chip are also connected to one end of the inductor L12, the other end of the inductor L12 is connected to the seventh pin, one end of the capacitor C125, one end of the capacitor C165 and one end of the inductor L11, the other ends of the capacitor C125 and the capacitor C165 are grounded, and the other end of the inductor L11 is connected to the power supply.

[0053] It can be understood that in the constant current drive circuit, the SY7203 chip, as a core component, receives the control signal from the main control chip through its ninth pin, and adjusts the output current through an internal mechanism to change the backlight brightness. At the same time, the feedback loop formed by transistor Q10, resistor R155, capacitor C85, capacitor C28 and resistor R154 ensures the accuracy of adjusting the backlight brightness according to the control signal sent by the main control chip. The main control chip sends a switch signal through the ONBACKLITE interface to control the state of transistor Q10, thereby turning the backlight on or off. In addition, the second pin of the SY7203 chip ensures the stability of the output current through the relevant resistor and capacitor network; finally, through the filtering network, the smoothness of the output current is ensured and the fluctuation is reduced, thereby achieving precise control of the backlight brightness, while ensuring the stability of current and voltage, and improving the display quality and the service life of the backlight source.

[0054] Optionally, the backlight circuit also includes a backlight adjustment circuit. It is understandable that in some cases, the secondary display screen may not have the function of independently adjusting the backlight brightness, which brings inconvenience to the user. In order to solve this problem, the backlight brightness of the secondary display screen can be controlled by adding a backlight adjustment circuit to the display driver circuit. Therefore, the backlight circuit in this embodiment includes a backlight adjustment circuit, which is connected to the main control chip and can receive a control signal from the main control chip. The user can issue instructions to adjust the backlight brightness through the UI interface on the main control chip, and these instructions will be passed to the backlight adjustment circuit to adjust the backlight brightness of the secondary display screen. In this way, the user or the system is allowed to automatically or manually adjust the backlight brightness according to changes in ambient light or other factors, which can provide the best visual experience under different lighting conditions and improve ease of use.

[0055] Alternatively, as Figure 3As shown, the backlight adjustment circuit includes an MP3437GRP chip; the eighth pin of the MP3437GRP chip is connected to one end of the capacitor C35, the other end of the capacitor C35 is connected to the sixth pin of the MP3437GRP chip and one end of the inductor L9, the other end of the inductor L9 is connected to the tenth pin of the MP3437GRP chip, one end of the resistor R22, one end of the capacitor C5, one end of the capacitor C4 and one end of the resistor R41; the other end of the resistor R22 is connected to the first pin of the MP3437GRP chip, the other ends of the capacitors C5 and C4 are grounded, and the other end of the resistor R41 is connected to the power supply; the ninth pin of the MP3437GRP chip is connected to one end of the resistor R9 and the resistor R10. The other end of the resistor R9 is connected to the tenth pin, the other end of the resistor R10 and one end of the capacitor C16 are grounded, and the other end of the capacitor C16 is connected to the second pin of the MP3437GRP chip; the seventh pin of the MP3437GRP chip is connected to one end of the capacitor C17, one end of the resistor R39, one end of the capacitor C10, one end of the capacitor C24, one end of the capacitor C1, and the power supply; the other end of the capacitor C17 is grounded, the other end of the resistor R39 is connected to one end of the resistor R28 and the resistor R8, the other end of the resistor R28 is connected to the third pin of the MP3437GRP chip, the other end of the resistor R28 is grounded, the other end of the capacitor C10 is grounded, and the other ends of the capacitors C24 and C1 are grounded.

[0056] It's understood that in the backlight regulation circuit, the MP3437GRP chip serves as a core component, outputting a regulated current through its seventh pin. This output current is then adjusted through an internal mechanism to alter the backlight brightness. This design allows the backlight regulation circuit to precisely control backlight brightness while ensuring current and voltage stability.

[0057] In this embodiment, the handwriting circuit includes a display menu circuit and an instruction acquisition circuit, the display menu circuit and the instruction acquisition circuit are connected, and the display menu circuit and the instruction acquisition circuit are connected to the main control chip.

[0058] It is understood that the display menu circuit is used to generate a user interface (UI), which can be a graphical menu. Users can select different options through touch or physical buttons. These options may include, but are not limited to, adjusting backlight brightness and switching display modes. The command acquisition circuit is used to capture user operation commands on the display menu interface and convert them into a signal format that can be recognized by the main control chip. For example, when a user selects a menu item through the touch screen, the command acquisition circuit captures this operation and converts it into a corresponding control signal.

[0059] In practical applications, the command acquisition circuit converts captured user operation commands into control signals and transmits them to the main control chip through a connection with the main control chip. After receiving the control signals from the command acquisition circuit, the main control chip performs corresponding operations based on the signal content, such as adjusting the backlight brightness and switching the display mode. In this way, the handwriting circuit can provide an intuitive user interface to control the various functions of the display driver circuit, improving the user experience and convenient operation.

[0060] Alternatively, as Figure 4 As shown, the handwriting circuit includes a SY7152 chip; the first pin of the SY7152 chip is connected to the anode of the diode D5 and one end of the inductor L4, and the cathode of the diode D5 is connected to one end of the capacitor C3, one end of the resistor R5, one end of the capacitor C45, one end of the capacitor C58 and the power supply; the other end of the capacitor C3 is connected to the third pin of the SY7152 chip, and the other end of the resistor R5 is connected to the resistor R7 and the third pin of the SY7152 chip; the other end of the inductor L4 is connected to one end of the capacitor C56, one end of the capacitor C2, one end of the resistor R63 and the sixth pin and the fifth pin of the SY7152 chip; the other end of the capacitor 56 and the capacitor C2 are grounded, the resistor R63 is connected to the USB-VCC interface, the fifth pin is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R12 and the fourth pin of the SY7152 chip, and the other end of the resistor R12, the resistor R7, the capacitor C45 and the capacitor C58 are grounded.

[0061] Optionally, the display driving circuit includes a protection circuit. It is understandable that the protection circuit may be one or more of an overvoltage protection circuit, an overcurrent protection circuit, a short circuit protection circuit, a temperature protection circuit, and a reverse voltage protection circuit.

[0062] In this embodiment, if Figure 5 As shown, the protection circuit is a low-level protection circuit. In this way, protection measures can be taken when the input voltage is lower than a certain threshold to prevent equipment damage or unstable operation caused by insufficient voltage.

[0063] Alternatively, as Figure 6 As shown, the connection circuit includes a TYPE-C connection circuit; Figure 7 As shown, the connection circuit includes an HDMI connection circuit.

[0064] It is understandable that in actual applications, not only TYPE-C connection circuits and HDMI connection circuits can be included, but also eDP connection circuits and connector conversion circuits, etc. In this way, by supporting multiple types of connectors, the display driver circuit can be compatible with a wider variety of display devices. Users can choose the connection method that suits their device, whether it is a laptop, smartphone, or other multimedia device, they can all be easily connected to the display driver circuit. This improves the compatibility and flexibility of the system, thereby enhancing the ease of use of the display driver circuit.

[0065] The present invention also provides a display device, which includes a display driving circuit. The specific structure of the display driving circuit refers to the above-mentioned embodiment. Since the present display device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0066] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A display driving circuit, characterized in that: The display driving circuit includes: Main control chip; A connecting circuit, connected to the main control chip, for connecting the first display screen and the second display screen; A handwriting circuit connected to the main control chip, configured to receive user operation instructions and transmit the user operation instructions to the main control chip, wherein the main control chip is configured to receive the user operation instructions and output corresponding control signals; The backlight circuit is connected to the main control chip, and is used to receive the control signal and output a corresponding adjustment signal to adjust the backlight brightness of the second display screen accordingly.

2. The display driving circuit according to claim 1, wherein: The backlight circuit includes a constant current driving circuit.

3. The display driving circuit according to claim 2, wherein: The constant current drive circuit includes a SY7203 chip and a CON2 chip; The ninth pin of the SY7203 chip is connected to one end of the resistor R155, one end of the capacitor C85, the collector of the transistor Q10, and one end of the resistor R152. The base of the transistor Q10 is connected to the capacitor C28 and one end of the resistor R154. The other end of the resistor R155, the other end of the capacitor C85, the emitter of the transistor Q10, and the other end of the capacitor C28 are connected to a common ground. The other end of the resistor R154 is connected to the main control chip through the ONBACKLITE interface, and the other end of the resistor R152 is connected to the main control chip through the ADJBACKLITE interface. The second pin of the SY7203 chip is connected to one end of the resistor R203 and the resistor R214, the other end of the resistor R203 is connected to the resistor R221 and one end of the capacitor C25, the resistor R221 is connected to the main control chip via the ADJBACKLITE interface, and the other end of the capacitor C25 is grounded; the other end of the resistor R214 is connected to one end of the resistor R202, one end of the resistor R217, and the CON2 chip via the VLED- interface, and the other ends of the resistor R202 and the resistor R217 share a common ground; The eighth pin of the SY7203 chip is connected to the VLED+ of the CON2 chip through the capacitor R210; The fourth and fifth pins of the SY7203 chip are connected to the anode of the diode D2, the cathode of the diode D2 is connected to one end of the capacitor C27, one end of the capacitor C166 and one end of the inductor L10, the other ends of the capacitor C27 and the capacitor C166 are grounded, and the other end of the inductor L10 is connected to the CON2 chip through the VLED+ interface; the fourth and fifth pins of the SY7203 chip are also connected to one end of the inductor L12, the other end of the inductor L12 is connected to the seventh pin, one end of the capacitor C125, one end of the capacitor C165 and one end of the inductor L11, the other ends of the capacitor C125 and the capacitor C165 are grounded, and the other end of the inductor L11 is connected to the power supply.

4. The display driving circuit according to claim 1, wherein: The backlight circuit further includes a backlight adjustment circuit.

5. The display driving circuit according to claim 4, wherein: The backlight adjustment circuit includes an MP3437GRP chip; The eighth pin of the MP3437GRP chip is connected to one end of a capacitor C35. The other end of the capacitor C35 is connected to the sixth pin of the MP3437GRP chip and one end of an inductor L9. The other end of the inductor L9 is connected to the tenth pin of the MP3437GRP chip, one end of a resistor R22, one end of a capacitor C5, one end of a capacitor C4, and one end of a resistor R41. The other end of the resistor R22 is connected to the first pin of the MP3437GRP chip. The other ends of the capacitors C5 and C4 are connected to a common ground. The other end of the resistor R41 is connected to a power supply. The ninth pin of the MP3437GRP chip is connected to one end of the resistor R9 and the resistor R10, the other end of the resistor R9 is connected to the tenth pin, the other end of the resistor R10 and one end of the capacitor C16 are grounded, and the other end of the capacitor C16 is connected to the second pin of the MP3437GRP chip; The seventh pin of the MP3437GRP chip is connected to one end of capacitor C17, one end of resistor R39, one end of capacitor C10, one end of capacitor C24, one end of capacitor C1, and a power supply; the other end of capacitor C17 is grounded, the other end of resistor R39 is connected to one end of resistor R28 and resistor R8, the other end of resistor R28 is connected to the third pin of the MP3437GRP chip, the other end of resistor R28 is grounded, the other end of capacitor C10 is grounded, and the other ends of capacitor C24 and capacitor C1 share a common ground.

6. The display driving circuit according to claim 1, wherein: The handwriting circuit includes a display menu circuit and an instruction acquisition circuit, the display menu circuit and the instruction acquisition circuit are connected, and the display menu circuit and the instruction acquisition circuit are connected to the main control chip.

7. The display driving circuit according to claim 6, wherein: The handwriting circuit includes a SY7152 chip; The first pin of the SY7152 chip is connected to the anode of the diode D5 and one end of the inductor L4, and the cathode of the diode D5 is connected to one end of the capacitor C3, one end of the resistor R5, one end of the capacitor C45, one end of the capacitor C58 and the power supply; the other end of the capacitor C3 is connected to the third pin of the SY7152 chip, and the other end of the resistor R5 is connected to the resistor R7 and the third pin of the SY7152 chip; the other end of the inductor L4 is connected to one end of the capacitor C56, one end of the capacitor C2, one end of the resistor R63 and the sixth and fifth pins of the SY7152 chip; the other end of the capacitor 56 and the capacitor C2 are grounded, the resistor R63 is connected to the USB-VCC interface, the fifth pin is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R12 and the fourth pin of the SY7152 chip, and the other end of the resistor R12, the resistor R7, the capacitor C45 and the capacitor C58 are grounded.

8. The display driving circuit according to claim 1, wherein: The display driving circuit includes a protection circuit.

9. The display driving circuit according to claim 1, wherein: The connection circuit includes a TYPE-C connection circuit and an HDMI connection circuit.

10. A display device, characterized in that: The display device comprises the display driving circuit according to any one of claims 1 to 9.

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