LCD screen control module

Abstract

The utility model discloses a LCD screen control module is applied to LCD screen, including power module, LCD screen chip, power -off detection circuit and MCU, and MCU is linked with LCD screen chip, and power module is linked with LCD screen chip through power -off detection circuit, to when detecting the shutdown, control LCD screen chip reset. The utility model discloses a LCD screen control module is linked with power module and the power -off detection circuit of LCD screen chip, to when detecting the shutdown, control LCD screen chip reset, can realize the automatic identification shutdown action's occurrence to reset LCD screen in time fast control, eliminate the problem that LCD screen exists residual image when shutting down and LCD screen is full of screen or the screen of flashing when the continuous on -off.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to an LCD screen control module. Background Technology

[0002] As LCD screens are increasingly used in desktop media players, the driving voltage of an LCD screen remains for several seconds after powering off, resulting in a faint afterimage left when the screen is turned off. Continuous power cycles may cause the LCD screen to display distorted images or flicker. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an LCD screen control module to solve the technical problems of LCD screen having afterimages when the power is off and LCD screen flickering or distorted when the power is turned on and off continuously.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution: providing an LCD screen control module, applied in an LCD screen, including a power module, an LCD screen chip, a power-down detection circuit and an MCU, wherein the MCU is connected to the LCD screen chip, and the power module is connected to the LCD screen chip through the power-down detection circuit, so as to control the LCD screen chip to reset when a power-off is detected.

[0005] The further technical solution is as follows: the power-down detection circuit includes a sixth diode, a twentieth polarized capacitor, a seventeenth resistor, a first switching transistor, and a second switching transistor. The anode of the sixth diode is connected to the output terminal of the power module, the cathode of the sixth diode is connected to the positive terminal of the twentieth polarized capacitor, and the negative terminal of the twentieth polarized capacitor is grounded, so that the power module charges the twentieth polarized capacitor through the sixth diode. The two ends of the seventeenth resistor are respectively connected to the output terminal of the power module and the control terminal of the first switching transistor. The first end of the first switching transistor is connected to the cathode of the sixth diode and the positive terminal of the twentieth polarized capacitor. The second end of the first switching transistor is connected to the input terminal of the second switching transistor and the eighteenth grounding resistor. The output terminal of the second switching transistor is connected to the reset pin of the LCD screen chip. The MCU is connected to the reset pin of the LCD screen chip through the tenth resistor.

[0006] The further technical solution is as follows: the first switching transistor is a PNP transistor, the second switching transistor is an NPN transistor, the base of the first switching transistor is connected to the seventeenth resistor, the emitter of the first switching transistor is connected to the cathode of the sixth diode and the positive terminal of the twentieth polarized capacitor, the collector of the first switching transistor is connected to the base of the second switching transistor and the eighteenth grounding resistor, the emitter of the second switching transistor is grounded, and the collector of the second switching transistor is connected to the reset pin of the LCD screen chip.

[0007] The further technical solution is as follows: the second switching transistor is a transistor with the model number DTC124EKA.

[0008] The further technical solution is as follows: the power module includes a power socket, a power switch, a transformer, a rectifier unit, a second capacitor, and a voltage regulator unit. The power socket is connected to the primary winding of the transformer via the power switch. The secondary winding of the transformer is connected to the input terminal of the rectifier unit. The output terminal of the rectifier unit is connected to the input terminal of the voltage regulator unit. The first terminal of the second capacitor is grounded, and the second terminal of the second capacitor is electrically connected between the output terminal of the rectifier unit and the input terminal of the voltage regulator unit. The output terminal of the voltage regulator unit serves as the output terminal of the power module.

[0009] The further technical solution is as follows: the voltage regulation unit includes a voltage regulator of model LM317. The voltage input pin of the voltage regulator is connected to the output pin of the rectifier unit and the second pin of the second capacitor. The voltage adjustment pin of the voltage regulator is connected to the voltage output pin of the voltage regulator through a fifth resistor. The voltage adjustment pin of the voltage regulator is connected to one end of a sixth resistor, and the other end of the sixth resistor is grounded. The voltage output pin of the voltage regulator serves as the output pin of the voltage regulation unit and is connected to a first grounded capacitor.

[0010] The further technical solution is as follows: the LCD screen control module also includes an LCD screen interface power supply circuit and an LCD screen driving circuit. The power supply module is connected to the power supply pin of the LCD screen chip through the LCD screen interface power supply circuit, and the power supply module is connected to the LCD screen chip through the LCD screen driving circuit.

[0011] The further technical solution is as follows: the LCD screen interface power supply circuit includes a power chip, the output terminal of the power module is connected to the voltage input pin of the power chip, the chip enable pin of the power chip is connected to the voltage input pin of the power chip through the sixteenth resistor, the output terminal of the power module and the voltage input pin of the power chip are electrically connected to the eighteenth capacitor with one end grounded, and the voltage output pin of the power chip is connected to the power supply pin of the LCD screen chip.

[0012] The further technical solution is as follows: the LCD screen driving circuit includes a single-inductor dual-output voltage regulator of model TPS65135. The voltage input terminal of the single-inductor dual-output voltage regulator is connected to the output terminal of the power supply module. The positive voltage output terminal of the single-inductor dual-output voltage regulator is connected to the positive driving power supply pin of the LCD screen chip. The negative voltage output terminal of the single-inductor dual-output voltage regulator is connected to the negative driving power supply pin of the LCD screen chip.

[0013] The further technical solution is as follows: the LCD screen control module also includes a backlight power supply circuit. The power supply module is connected to the LCD screen chip through the backlight power supply circuit. The backlight power supply circuit includes an LED boost converter of model TPS61165DBVR. The output terminal of the power supply module is connected to the voltage input terminal of the LED boost converter through a fuse. The voltage input terminal of the LED boost converter is connected to the control terminal of the LED boost converter through a seventh resistor. The compensation terminal of the LED boost converter is connected to the ninth grounding capacitor. The switching terminal of the LED boost converter is connected to the LED analog signal input terminal of the LCD screen chip through a fifth diode. The feedback terminal of the LED boost converter is connected to the LED terminal of the LCD screen chip.

[0014] The beneficial technical effects of this utility model are as follows: The LCD screen control module of this utility model, by setting a power failure detection circuit connected to the power module and the LCD screen chip, controls the LCD screen chip to reset when a power-off is detected. This enables automatic identification of the power-off action and timely and rapid control of the LCD screen reset, eliminating the problem of residual images on the LCD screen when the power is off, and eliminating the problem of screen flickering or distorted display when the power is switched on and off continuously. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the frame of the LCD screen control module provided in an embodiment of this utility model;

[0017] Figure 2 A circuit diagram showing the connection between the power-off detection circuit of the LCD screen control module and the LCD screen chip provided in this embodiment of the utility model.

[0018] Figure 3Circuit diagram of the power supply module of the LCD screen control module provided in this embodiment of the utility model;

[0019] Figure 4 A circuit diagram of the LCD screen interface power supply circuit of the LCD screen control module provided in this embodiment of the utility model;

[0020] Figure 5 A circuit diagram of the LCD screen driving circuit of the LCD screen control module provided in this embodiment of the utility model;

[0021] Figure 6 A circuit diagram of the backlight power supply circuit of the LCD screen control module provided in this embodiment of the utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1 to 6 , Figure 1 This is a schematic diagram of the LCD screen control module provided in an embodiment of the present invention. The LCD screen control module is applied to an LCD screen and includes a power module 11, an LCD screen chip CN1, a power-down detection circuit 12, and an MCU 13. The MCU 13 is connected to the LCD screen chip CN1, and the power module 11 is connected to the LCD screen chip CN1 through the power-down detection circuit 12 so as to control the LCD screen chip CN1 to reset when a power-down is detected.

[0024] The LCD screen chip CN1 is connected to the MCU 13 via a MIPI line, and operates according to the control of the MCU 13. The power supply module 11 provides operating voltage for both the LCD screen chip CN1 and the MCU 13. The operating voltage output by the power supply module 11 can be 5V. The LCD screen control module, through a power-down detection circuit 12 connected to the power supply module 11 and the LCD screen chip CN1, controls the LCD screen chip CN1 to reset when a power-off event is detected. This enables automatic recognition of power-off actions and timely and rapid control of the LCD screen reset, eliminating the problem of afterimages on the LCD screen during power-off and eliminating screen flickering or distorted images during continuous power-on and power-off cycles.

[0025] Specifically, such as Figure 2As shown, in this embodiment, the power-down detection circuit 12 includes a sixth diode D6, a twentieth polarity capacitor C20, a seventeenth resistor R17, a first switching transistor Q1, and a second switching transistor Q2. The anode of the sixth diode D6 is connected to the output terminal of the power module 11, and the cathode of the sixth diode D6 is connected to the positive terminal of the twentieth polarity capacitor C20. The negative terminal of the twentieth polarity capacitor C20 is grounded, so that the power module 11 charges the twentieth polarity capacitor C20 through the sixth diode D6. The two ends of the seventeenth resistor R17 are respectively connected to the power module 11. The output terminal of module 11 is connected to the control terminal of the first switching transistor Q1. The first terminal of the first switching transistor Q1 is connected to the cathode of the sixth diode D6 and the positive terminal of the second twentieth polarity capacitor C20. The second terminal of the first switching transistor Q1 is connected to the input terminal of the second switching transistor Q2 and the eighteenth grounding resistor R18. The output terminal of the second switching transistor Q2 is connected to the reset pin RESX of the LCD screen chip CN1. The MCU13 is connected to the reset pin RESX of the LCD screen chip CN1 through the tenth resistor R10 to control the reset of the LCD screen. An eleventh grounding capacitor C11 is electrically connected between the tenth resistor R10 and the reset pin RESX of the LCD screen chip CN1. The reset pin RESX of the LCD screen chip CN1 is connected to the reset signal terminal MIPI_LCD_RST of the MCU13 through the tenth resistor R10. The operating voltage output by the power module 11 charges the second twentieth polarity capacitor C20 through the sixth diode D6.

[0026] Specifically, the first switching transistor Q1 is a PNP transistor, and the second switching transistor Q2 is an NPN transistor. The base of the first switching transistor Q1 is connected to the seventeenth resistor R17, the emitter of the first switching transistor Q1 is connected to the cathode of the sixth diode D6 and the positive terminal of the twentieth polarized capacitor C20, the collector of the first switching transistor Q1 is connected to the base of the second switching transistor Q2 and the eighteenth grounding resistor R18, the emitter of the second switching transistor Q2 is grounded, and the collector of the second switching transistor Q2 is connected to the reset pin RESX of the LCD screen chip CN1.

[0027] Preferably, in this embodiment, the second switch Q2 is a transistor of model DTC124EKA. The first switch Q1 can be a transistor of model S8550.

[0028] Specifically, such as Figure 3As shown, in this embodiment, the power module 11 includes a power socket J1A, a power switch J2B, a transformer T1, a rectifier unit 101, a second capacitor C2, and a voltage regulator unit 102. The power socket J1A is connected to the primary winding of the transformer T1 via the power switch J2B. The secondary winding of the transformer T1 is connected to the input terminal of the rectifier unit 101. The output terminal of the rectifier unit 101 is connected to the input terminal of the voltage regulator unit 102. The first terminal of the second capacitor C2 is grounded, and the second terminal of the second capacitor C2 is electrically connected between the output terminal of the rectifier unit 101 and the input terminal of the voltage regulator unit 102. The output terminal of the voltage regulator unit 102 serves as the output terminal of the power module 11. The rectifier unit 101 can be a bridge rectifier circuit composed of four diodes. The two input terminals of the bridge rectifier circuit are respectively connected to the two ends of the secondary winding of the transformer T1. The positive output terminal of the bridge rectifier circuit serves as the output terminal of the rectifier unit 101, and the negative output terminal of the bridge rectifier circuit is grounded. Power socket J1A is used to connect to mains power and obtain mains power. Power socket J1A can be an ICE / C14 type socket. The second capacitor C2 can be a polarized capacitor. The negative terminal of the second capacitor C2 is grounded, and the positive terminal of the second capacitor C2 is connected to the output terminal of the rectifier unit 101 and the input terminal of the voltage regulator unit 102. The mains power is converted into 5V DC power by the power module 11 as the working voltage.

[0029] Specifically, in this embodiment, the voltage regulation unit 102 includes a voltage regulator U1 of model LM317. The voltage input pin Vin of the voltage regulator U1 is connected to the output terminal of the rectifier unit 101 and the second terminal of the second capacitor C2. The voltage adjustment pin ADJ of the voltage regulator U1 is connected to the voltage output pin Vout of the voltage regulator U1 through the fifth resistor R5. The voltage adjustment pin ADJ of the voltage regulator U1 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded. The voltage output pin Vout of the voltage regulator U1 serves as the output terminal of the voltage regulation unit 102 and is connected to the first grounded capacitor C1. The voltage regulator U1 of model LM317 is an adjustable three-terminal positive voltage regulator, which can provide more than 1.5A of current in the output voltage range of 1.2V to 37V and is easy to use. The voltage output pin Vout of the voltage regulator U1 is also connected to the positive terminal of the third polarity capacitor C3, which is grounded.

[0030] Combination Figure 4 and Figure 5Specifically, the LCD screen control module further includes an LCD screen interface power supply circuit and an LCD screen driving circuit. The power module 11 is connected to the power supply pin IOVCC of the LCD screen chip CN1 through the LCD screen interface power supply circuit. The LCD screen interface power supply circuit is used to supply power to the interface circuit of the LCD screen. The power module 11 is connected to the LCD screen chip CN1 through the LCD screen driving circuit and is used to provide driving voltage to the LCD screen to drive the LCD screen to work.

[0031] Specifically, in this embodiment, the LCD screen interface power supply circuit includes a power chip U5. The output terminal of the power module 11 is connected to the voltage input pin VI of the power chip U5. The chip enable pin CE of the power chip U5 is connected to the voltage input pin VI of the power chip U5 through a sixteenth resistor R16. An eighteenth capacitor C18 with one end grounded is electrically connected between the output terminal of the power module 11 and the voltage input pin VI of the power chip U5. The voltage output pin VO of the power chip U5 is connected to the power supply pin IOVCC of the LCD screen chip CN1. The voltage output pin VO of the power chip U5 is connected to a nineteenth capacitor C19 with one end grounded, and the ground pin G of the power chip U5 is grounded. The output voltage of the LCD screen interface power supply circuit is 1.8V.

[0032] Preferably, the LCD screen driving circuit includes a single-inductor dual-output voltage regulator U3 of model TPS65135. The voltage input terminal VIN of the single-inductor dual-output voltage regulator U3 is connected to the output terminal of the power module 11. The positive voltage output terminals OUT_P1 and OUT_P2 of the single-inductor dual-output voltage regulator U3 are connected to the positive driving power supply pin VSP of the LCD screen chip CN1. The negative voltage output terminals OUT_N1 and OUT_N2 of the single-inductor dual-output voltage regulator U3 are connected to the negative driving power supply pin VSN of the LCD screen chip CN1. Among them, the positive voltage output terminals OUT_P1 and OUT_P2 of the single-inductor dual-output voltage regulator U3 can output a +5.5V voltage to be transmitted to the positive drive power supply pin VSP of the LCD screen chip CN1. The negative voltage output terminals OUT_N1 and OUT_N2 of the single-inductor dual-output voltage regulator U3 can output a -5.5V voltage to be transmitted to the negative drive power supply pin VSN of the LCD screen chip CN1. The positive voltage output terminals OUT_P1 and OUT_P2 of the single-inductor dual-output voltage regulator U3 are connected, and the negative voltage output terminals OUT_N1 and OUT_N2 of the single-inductor dual-output voltage regulator U3 are connected. The 5V DC voltage output by the power module 11 is converted into AC voltage through the single-inductor dual-output voltage regulator U3 to drive the LCD screen. The voltage input terminal VIN of the single-inductor dual-output voltage regulator U3 is connected to the output terminal of the power module 11. A thirteenth-polarity capacitor C13 (negative terminal grounded), a twelfth-polarity capacitor C12 (one end grounded), and a fourteenth-polarity resistor R14 (one end grounded) are electrically connected between the voltage input terminal VIN of the single-inductor dual-output voltage regulator U3 and the output terminal of the single-inductor dual-output voltage regulator U3. The voltage input terminal VIN of the single-inductor dual-output voltage regulator U3 is connected to the enable terminal EN of the single-inductor dual-output voltage regulator U3 through the thirteenth resistor R13. The positive voltage output terminals OUT_P1 and OUT_P2 of the single-inductor dual-output voltage regulator U3 are connected to the fourteenth-polarity grounded capacitor C14. The negative voltage output terminals OUT_N1 and OUT_N2 of the single-inductor dual-output voltage regulator U3 are connected to the sixteenth-polarity grounded capacitor C16.The first inductor terminals L1A and L1B of the single-inductor dual-output voltage regulator U3 are connected to one end of the second inductor L2, and the second inductor terminals L2A and L2B are connected to the other end of the second inductor L2. The reference voltage output terminal VAUX of the single-inductor dual-output voltage regulator U3 is grounded through the fifteenth capacitor C15. The positive voltage output terminals OUT_P1 and OUT_P2 of the single-inductor dual-output voltage regulator U3 are connected to the single-inductor dual-output voltage regulator U3 through the eleventh resistor R11. The positive feedback terminal FB of the single-inductor dual-output voltage regulator U3 is connected to the negative feedback terminal FBG of the single-inductor dual-output voltage regulator U3 through the fifteenth resistor R15. The positive feedback terminal FB of the single-inductor dual-output voltage regulator U3 is connected to the negative feedback terminal FBG of the single-inductor dual-output voltage regulator U3 through the twelfth resistor R12. The eleventh resistor R11, the twelfth resistor R12 and the fifteenth resistor R15 are connected in series in sequence.

[0033] Specifically, in combination Figure 6The LCD screen control module also includes a backlight power supply circuit. The power supply module 11 is connected to the LCD screen chip CN1 through the backlight power supply circuit. The backlight power supply circuit includes an LED boost converter U2 of model TPS61165DBVR. The output terminal of the power supply module 11 is connected to the voltage input terminal VIN of the LED boost converter U2 through a fuse FB1. The voltage input terminal VIN of the LED boost converter U2 is connected to the control terminal CTRL of the LED boost converter U2 through a seventh resistor R7. The compensation terminal COMP of the LED boost converter U2 is connected to the ninth resistor. The LED boost converter U2 is connected to the ground capacitor C9. The switching terminal SW of the LED boost converter U2 is connected to the LED analog signal input terminal LED_AN of the LCD screen chip CN1 through the fifth diode D5 to supply power to the positive terminal LED+ of the LED used for backlighting of the LCD screen. The feedback terminal FB of the LED boost converter U2 is connected to the LED terminals LED_CA1, LED_CA2 and LED_CA3 of the LCD screen chip CN1 to supply power to the negative terminal LED- of the LED used for backlighting of the LCD screen. The feedback terminal FB of the LED boost converter U2 is connected to the ninth grounding resistor R9. The voltage input terminal VIN and the switching terminal SW of the LED boost converter U2 are respectively connected to the two ends of the first inductor L1, which is an iron-core inductor. A seventh grounding capacitor C7 is electrically connected between the fuse FB1 and the voltage input terminal VIN of the LED boost converter U2. An eighth grounding resistor R8 is electrically connected between the seventh resistor R7 and the control terminal CTRL of the LED boost converter U2. The anode of the fifth diode D5 is connected to the first inductor L1 and the switching terminal SW of the LED boost converter U2, and the cathode of the fifth diode D5 is connected to the LED analog signal input terminal LED_AN of the LCD screen chip CN1. An eighth grounding capacitor C8 is electrically connected between the LED analog signal input terminal LED_AN of the LCD screen chip CN1 and the cathode of the fifth diode D5. The backlight power supply circuit can boost the operating voltage output from the power module 11 to 25V to supply power to the LEDs used for backlighting on the LCD screen.

[0034] Based on the above design, during operation, the power module's power socket is connected to the mains power, and the power switch is closed to conduct. The mains power, after passing through the power socket and power switch, is transformed into AC voltage by a transformer. The AC voltage output by the transformer is rectified into DC voltage by the rectifier unit and then filtered by the second capacitor. The filtered DC voltage is converted into a stable operating voltage by the voltage regulator unit. The power-down detection circuit detects the operating voltage output by the power module and charges the twentieth polarized capacitor through the sixth diode. The base of the first switching transistor is connected to the operating voltage through the seventeenth resistor. When the power module is supplying power normally, the output operating voltage is stable, the first switching transistor is cut off, and the second switching transistor... At the end of the process, the reset pin of the LCD screen is controlled by the MCU. When the power is off, the operating voltage output by the power module begins to drop. The base of the first switching transistor discharges through the seventeenth resistor, while the twentieth polarized capacitor connected to the emitter of the first switching transistor maintains the operating voltage value. The first switching transistor is turned on, and the collector voltage of the first switching transistor becomes higher, causing the second switching transistor to also turn on. Consequently, the voltage of the reset pin of the LCD screen chip is pulled low, and the LCD screen chip is in a reset state. This controls the LCD screen to reset, turns off all displays, clears the afterimages on the LCD screen when the power is off, protects the LCD screen, and avoids screen flickering or distorted images when the power is turned on and off continuously.

[0035] In summary, the LCD screen control module of this utility model, by setting a power-off detection circuit connected to the power module and the LCD screen chip, controls the LCD screen chip to reset when a power-off is detected. This enables automatic recognition of the power-off action and timely and rapid control of the LCD screen reset, eliminating the problem of afterimages on the LCD screen when the power is off, and eliminating the problem of screen flickering or distorted display when the power is switched on and off continuously.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An LCD panel control module, characterized by, This device is used in LCD screens and includes a power module, an LCD screen chip, a power-down detection circuit, and an MCU. The MCU is connected to the LCD screen chip, and the power module is connected to the LCD screen chip through the power-down detection circuit to control the LCD screen chip to reset when a power-down is detected.

2. The LCD panel control module of claim 1, wherein, The power-down detection circuit includes a sixth diode, a twentieth polarized capacitor, a seventeenth resistor, a first switching transistor, and a second switching transistor. The anode of the sixth diode is connected to the output terminal of the power module, and the cathode of the sixth diode is connected to the positive terminal of the twentieth polarized capacitor. The negative terminal of the twentieth polarized capacitor is grounded, so that the power module charges the twentieth polarized capacitor through the sixth diode. The two ends of the seventeenth resistor are respectively connected to the output terminal of the power module and the control terminal of the first switching transistor. The first end of the first switching transistor is connected to the cathode of the sixth diode and the positive terminal of the twentieth polarized capacitor. The second end of the first switching transistor is connected to the input terminal of the second switching transistor and the eighteenth grounding resistor. The output terminal of the second switching transistor is connected to the reset pin of the LCD screen chip. The MCU is connected to the reset pin of the LCD screen chip through the tenth resistor.

3. The LCD panel control module of claim 2, wherein, The first switching transistor is a PNP transistor, and the second switching transistor is an NPN transistor. The base of the first switching transistor is connected to the seventeenth resistor, the emitter of the first switching transistor is connected to the cathode of the sixth diode and the positive terminal of the twentieth polarized capacitor, the collector of the first switching transistor is connected to the base of the second switching transistor and the eighteenth grounding resistor, the emitter of the second switching transistor is grounded, and the collector of the second switching transistor is connected to the reset pin of the LCD screen chip.

4. The LCD panel control module of claim 2 or 3, wherein, The second switching transistor is a DTC124EKA transistor.

5. The LCD screen control module according to claim 1, characterized in that, The power module includes a power socket, a power switch, a transformer, a rectifier unit, a second capacitor, and a voltage regulator unit. The power socket is connected to the primary winding of the transformer via the power switch. The secondary winding of the transformer is connected to the input terminal of the rectifier unit. The output terminal of the rectifier unit is connected to the input terminal of the voltage regulator unit. The first terminal of the second capacitor is grounded, and the second terminal of the second capacitor is electrically connected between the output terminal of the rectifier unit and the input terminal of the voltage regulator unit. The output terminal of the voltage regulator unit serves as the output terminal of the power module.

6. The LCD panel control module of claim 5, wherein, The voltage regulation unit includes a voltage regulator of model LM317. The voltage input pin of the voltage regulator is connected to the output pin of the rectifier unit and the second pin of the second capacitor. The voltage adjustment pin of the voltage regulator is connected to the voltage output pin of the voltage regulator through a fifth resistor. The voltage adjustment pin of the voltage regulator is connected to one end of a sixth resistor, and the other end of the sixth resistor is grounded. The voltage output pin of the voltage regulator serves as the output pin of the voltage regulation unit and is connected to a first grounded capacitor.

7. The LCD panel control module of claim 1, wherein, The LCD screen control module also includes an LCD screen interface power supply circuit and an LCD screen driving circuit. The power supply module is connected to the power supply pin of the LCD screen chip through the LCD screen interface power supply circuit, and the power supply module is connected to the LCD screen chip through the LCD screen driving circuit.

8. The LCD panel control module of claim 7, wherein, The LCD screen interface power supply circuit includes a power chip. The output terminal of the power module is connected to the voltage input pin of the power chip. The chip enable pin of the power chip is connected to the voltage input pin of the power chip through a sixteenth resistor. An eighteenth capacitor with one end grounded is electrically connected between the output terminal of the power module and the voltage input pin of the power chip. The voltage output pin of the power chip is connected to the power supply pin of the LCD screen chip.

9. The LCD panel control module of claim 7, wherein, The LCD screen driving circuit includes a TPS65135 single-inductor dual-output voltage regulator. The voltage input terminal of the single-inductor dual-output voltage regulator is connected to the output terminal of the power supply module. The positive voltage output terminal of the single-inductor dual-output voltage regulator is connected to the positive driving power supply pin of the LCD screen chip, and the negative voltage output terminal of the single-inductor dual-output voltage regulator is connected to the negative driving power supply pin of the LCD screen chip.

10. The LCD panel control module of claim 1, wherein, The LCD screen control module also includes a backlight power supply circuit. The power supply module is connected to the LCD screen chip through the backlight power supply circuit. The backlight power supply circuit includes an LED boost converter of model TPS61165DBVR. The output terminal of the power supply module is connected to the voltage input terminal of the LED boost converter through a fuse. The voltage input terminal of the LED boost converter is connected to the control terminal of the LED boost converter through a seventh resistor. The compensation terminal of the LED boost converter is connected to a ninth grounding capacitor. The switching terminal of the LED boost converter is connected to the LED analog signal input terminal of the LCD screen chip through a fifth diode. The feedback terminal of the LED boost converter is connected to the LED terminal of the LCD screen chip.

Images