CN115378242A

CN115378242A - Power module and display device

Info

Publication number: CN115378242A
Application number: CN202211143763.2A
Authority: CN
Inventors: 方彬斌; 钟甲平; 袁海江
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2022-11-22

Abstract

The embodiment of the application discloses a power module, including power module, power management system and step-down converting circuit, power module is used for output power supply voltage, power management system electric connection power module, and power management system receives power supply voltage and converts first group's driving voltage into, step-down converting circuit electric connection power module, and receive power supply voltage and convert second group's driving voltage into, second group's driving voltage is less than power supply voltage, through independently setting up step-down converting circuit, and make step-down converting circuit provide second group's driving voltage for the sequential control circuit, power management system's load has effectively been reduced, power management system generates heat has been alleviateed, the temperature rise phenomenon that power module arouses owing to generating heat has effectively been controlled. The embodiment of the application also discloses a display device comprising the power module.

Description

Power module and display device

Technical Field

The application relates to the technical field of display, in particular to a power module and a display device.

Background

With the development of display technology, display devices gradually develop to a large size and a high refresh rate, wherein the larger the size of the display panel is, the larger the load of the power management system for providing driving voltage for the display panel is, and when the display panel with the large size and the high refresh rate performs image display, the load of the power management system is too large, which causes the temperature of the power management system to be too high, and is easily over the working temperature specification of the power management system, thereby causing the power management system to enter a protection state and causing the display panel to be in a standby state.

At present, a heat dissipation device is usually added near a power management system to cool the power management system, but the method affects the overall structure of the display device and increases the space occupation.

Disclosure of Invention

In view of the above deficiencies of the prior art, the present application provides a power module and a display device that effectively reduce the heat generated by a power management system and occupy a small space.

The application discloses power module, including power module, power management system and step-down transform circuit, power module is used for output power supply voltage, power management system electric connection power module, and power management system receives mains voltage and converts first group drive voltage into, step-down transform circuit electric connection power module, and receive mains voltage and convert second group drive voltage into, second group drive voltage is less than mains voltage.

Optionally, the voltage-reducing conversion circuit includes an enabling unit and a voltage-reducing unit, the enabling unit is electrically connected to the voltage-reducing unit, the enabling unit receives the power voltage and outputs an enabling signal to the voltage-reducing unit according to the power voltage, and the enabling signal is used to start the voltage-reducing unit to perform voltage-reducing processing on the power voltage. The voltage reduction unit is used for reducing the voltage of the power supply and converting the voltage into a second group of driving voltages.

Optionally, the buck conversion circuit further includes a filtering and voltage stabilizing unit and a voltage regulating and feedback unit, the filtering and voltage stabilizing unit is electrically connected to the buck unit, and is configured to receive the second set of driving voltages from the buck unit and perform filtering processing on the second set of driving voltages, the voltage regulating and feedback unit is connected between the filtering and voltage stabilizing unit and the ground terminal, and is configured to adjust the second set of driving voltages in the transmission line, and feedback output a feedback signal to the buck unit according to the adjusted second set of driving voltages, and the buck unit adjusts the output second set of driving voltages according to the feedback signal.

Optionally, the buck conversion circuit further includes an electrostatic protection unit, and the electrostatic protection unit is connected between the voltage regulation feedback unit and the ground terminal, and is configured to perform electrostatic protection on the sequentially connected enable unit, the buck unit, the filtering and voltage stabilization unit, and the voltage regulation feedback unit.

Optionally, the enabling unit includes a first resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, a first connection end of the first resistor is connected to the power supply voltage, a second connection end of the first resistor is connected to the voltage dropping unit for dividing the power supply voltage, the first capacitor and the second capacitor are connected in parallel between the power supply voltage and the ground terminal for filtering the power supply voltage, and the third capacitor and the fourth capacitor are connected in parallel between the second connection end and the ground terminal for filtering the power supply voltage divided by the first resistor and outputting the filtered power supply voltage to the voltage dropping unit as an enabling signal.

Optionally, the voltage reducing unit includes a first port, a second port, a third port, and a fourth port, the first port receives a power supply voltage, the second port is connected to the enabling unit, and is configured to receive an enabling signal, and is configured to convert and output a second set of driving voltages when the enabling signal is started, the third port is connected to the voltage regulating feedback unit, and is configured to receive a feedback signal from the voltage regulating feedback unit, the voltage reducing unit adjusts a magnitude of the second set of driving voltages according to the feedback signal, the fourth port is connected to the filtering and voltage stabilizing unit, and the voltage reducing unit outputs the second set of driving voltages to the filtering and voltage stabilizing unit through the fourth port.

Optionally, the filtering and voltage stabilizing unit includes a fifth capacitor, a sixth capacitor, a second resistor, a third resistor, an inductor, and a first node, one end of the fifth capacitor is connected to the voltage reducing unit, and the other end of the fifth capacitor is sequentially connected in series with the second resistor and the inductor, and is configured to receive the second group of driving voltages from the voltage reducing unit and perform filtering processing on the second group of driving voltages. The first node is located between the second resistor and the inductor, and the third resistor and the sixth capacitor are connected in series between the first node and the ground terminal and are used for controlling the second group of driving voltages to be stable within a preset range.

Optionally, the voltage regulation feedback unit includes a fourth resistor, a fifth resistor, a seventh capacitor and a second node, the fourth resistor and the fifth resistor are connected in series between the filtering and voltage stabilization unit and the ground terminal, and are configured to divide the second group of driving voltages output by the filtering and voltage stabilization unit, the seventh capacitor is connected in parallel with the fourth resistor, and is configured to control the second group of driving voltages to be within a preset range, the second node is located between the fourth resistor and the fifth resistor, and the second node is connected to the third port of the voltage reduction unit, and is configured to output a feedback signal to the voltage reduction unit according to the divided voltage of the fifth resistor on the second group of driving voltages.

Optionally, the electrostatic protection unit includes an eighth capacitor, a ninth capacitor, a sixth resistor, and a diode, the eighth capacitor, the ninth capacitor, the sixth resistor, and the diode are connected in parallel between the voltage regulation feedback unit and the ground terminal, and are configured to perform electrostatic protection on the enabling unit, the voltage reduction unit, the filtering and voltage stabilization unit, and the voltage regulation feedback unit, and meanwhile, the eighth capacitor, the ninth capacitor, and the sixth capacitor are connected in parallel, and are configured to perform filtering processing on the second group of driving voltages, and the diode is configured to position the second group of driving voltage clamps within a preset range.

The embodiment of the application further discloses a display device, which comprises a display module and the power module, wherein the display module comprises a data driving circuit, a scanning driving circuit, a time sequence control circuit and a display panel. The data driving circuit, the scanning driving circuit and the display panel are connected to the power management system and used for receiving a first group of driving voltages from the power management system. The time sequence control circuit is connected with the voltage reduction conversion circuit and receives a second group of driving voltage, outputs a grid electrode output control signal to the scanning driving circuit under the driving of the second group of driving voltage, and outputs a source electrode output control signal to the data driving circuit. The data driving circuit outputs a data signal to the display panel according to the first group of driving voltages and the source electrode output control signal, the scanning driving circuit outputs a scanning signal to the display panel according to the first group of driving voltages and the grid electrode output control signal, and the display panel performs image display according to the data signal and the scanning signal.

Compared with the prior art, the voltage reduction conversion circuit is arranged independently of the power management system, and provides the second group of driving voltage for the sequential control circuit, so that the load of the power management system is effectively reduced, the heat productivity of the power management system is reduced, and the temperature rise phenomenon of the power module caused by heat is effectively controlled.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present disclosure;

FIG. 2 is a block diagram of the internal circuitry of the display device of FIG. 1;

FIG. 3 is a schematic plan view of the display module shown in FIG. 2;

FIG. 4 is a block diagram of the buck converter circuit of FIG. 2;

FIG. 5 is an equivalent circuit diagram of the buck converter circuit of FIG. 4;

fig. 6 is a block diagram of an internal circuit of a display device according to a first comparative embodiment of the present application.

Description of reference numerals: display device-100, display module-10, power supply module-20, support frame 30, data drive circuit-11, scan drive circuit-12, display panel-13, display area-13 a, timing control circuit-14, pixel unit-15, first direction-F1, second direction-F2, data lines-S1-Sm, scan lines-G1-Gn, clock signal-CLK, drive voltage-VDD, power supply management system-21, buck conversion circuit-22, power supply module-23, data signal-Data, clock signal-CLK, horizontal synchronization signal-Hsyn, vertical synchronization signal-Vsyn, gate output control signal-Cg, source output control signal-Cs, source output control signal-Cn the circuit comprises an enabling unit-221, a voltage reducing unit-222, a filtering and voltage stabilizing unit-223, a transmission line-N, a voltage regulating feedback unit-224, an electrostatic protection unit-225, a first resistor-R1, a first capacitor-C1, a second capacitor-C2, a third capacitor-C3, a fourth capacitor-C4, a first port-G1, a second port-G2, a third port-G3, a fourth port-G4, a fifth capacitor-C5, a sixth capacitor-C6, a second resistor-R2, a third resistor-R3, an inductor-L, a fourth resistor-R4, a fifth resistor-R5, a seventh capacitor-C7, an eighth capacitor-C8, a ninth capacitor-C9, a sixth resistor-R6 and a diode-D.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified. Directional phrases used in this application, such as, for example, "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used herein for better and clearer illustration and understanding of the application and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the application.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art. It should be noted that the terms "first", "second", and the like in the description and claims of the present application and in the drawings are used for distinguishing different objects and not for describing a particular order.

Furthermore, the terms "comprises," "comprising," "includes," "including," or "can include" when used in this application, specify the presence of stated features, operations, elements, and the like, and do not limit one or more other features, operations, elements, and the like. Furthermore, the terms "comprises" or "comprising" indicate the presence of the respective features, numbers, steps, operations, elements, components or combinations thereof disclosed in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof, and are intended to cover non-exclusive inclusions. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device 100 according to a first embodiment of the present application. The display device 100 includes a display module 10, a power module 20 and a supporting frame 30, the display module 10 and the power module 20 are fixed to the supporting frame 30, and the power module 20 is disposed on the back of the display module 10, which is the non-display surface of the display module 10. The power module 20 is used for providing a power voltage for the display module 10 to display images, and the supporting frame 30 provides fixing and protecting functions for the display module 10 and the power module 20.

Referring to fig. 2, fig. 2 is a block diagram of an internal circuit of the display device of fig. 1.

As shown in fig. 2, the power module 20 is electrically connected to the display module 10 and is used for providing a first set of driving voltages VDD1 and a second set of driving voltages VDD2 for the display module 10. Wherein, power module 20 includes power management system 21, step-down converting circuit 22 and power module 23, and power management system 21 electric connection power module 23 for receive mains voltage VCC and convert first group drive voltage VDD1 from power module 23, step-down converting circuit 22 electric connection power module 23 for receive mains voltage VCC and convert second group drive voltage VDD2 into, second group drive voltage VDD2 is less than mains voltage VCC.

The display module 10 includes a data driving circuit 11, a scan driving circuit 12, a display panel 13, and a timing control circuit 14.

The power management system 21 is electrically connected to the data driving circuit 11, the scan driving circuit 12 and the display panel 13, and is configured to provide a first set of driving voltages VDD1 for the data driving circuit 11, the scan driving circuit 12 and the display panel 13. The data driving circuit 11 is driven according to a first set of driving voltage VDD1 to output a data signal to the display panel, the scan driving circuit 12 outputs a scan signal to the display panel 13 according to the first set of driving voltage VDD1 and the gate output control signal, and the display panel 13 displays an image according to the data signal and the scan signal.

The first driving voltage group VDD1 includes a data power signal, an analog power signal, a half analog voltage signal, a gate high level signal, a gate low level signal, a common voltage, a ground voltage, and the like.

Specifically, the data power signal, the analog power signal and the half analog voltage signal are used for being output to the data driving circuit 11, so as to drive the data driving circuit 11 to output the data signal to the pixel unit in the display panel 13, so as to control the pixel unit to perform image display, the common voltage is output to the display panel 13, so as to provide a reference voltage for the display panel 13, and the reference voltage and the data voltage corresponding to the data signal of the pixel unit form an electric field to drive liquid crystal in the pixel unit to deflect, so as to emit light rays with preset gray scale.

The gate high level signal and the gate low level signal are output to the scan driving circuit 12, and the scan driving circuit 12 outputs a scan signal to the pixel unit according to the gate high level signal and the gate low level signal, and controls the pixel unit to display an image in cooperation with the data signal.

The ground voltage is output to the data driving circuit 11, the scan driving circuit 12, and the display panel 13 for supplying low voltage potentials to the data driving circuit 11, the scan driving circuit 12, and the display panel 13. In this embodiment, the low voltage potential provided corresponding to the ground voltage may be 0V.

The timing control circuit 14 is electrically connected to the buck conversion circuit 22, receives the second set of driving voltages VDD2 from the buck conversion circuit 22, and outputs a source output control signal to the data driving circuit 11 to control the data driving circuit 11 to output a data signal and a gate output control signal to the scan driving circuit 12 to control the scan driving circuit 12 to output a scan signal under the driving of the second set of driving voltages VDD2.

In an exemplary embodiment, the power module 20 includes a first buck converter circuit and a second buck converter circuit, the first buck converter circuit and the second buck converter circuit are respectively and independently configured and respectively receive the second set of driving voltages VDD2 from the power module 23, the first buck converter circuit drives the timing control circuit 14 to operate according to the second set of driving voltages VDD2, and the second buck converter circuit outputs a half-analog voltage signal to the data driving circuit 11 according to the second set of driving voltages VDD2 to drive the data driving circuit 11 to output a data signal. Of course, according to specific needs, the plurality of buck conversion circuits 22 may be independently disposed and respectively receive the second group of driving voltages VDD2 from the power module 23 to share the load of the power management system 21.

The step-down conversion circuit 22 is arranged independently of the power management system to provide driving voltage for a plurality of functional modules in the display module 10, so that the load of the power management system is effectively reduced, and the heat generation of the power management system is reduced.

Referring to fig. 3, fig. 3 is a schematic plan layout structure of the display module 10 in fig. 2.

As shown in fig. 3, the data driving circuit 11, the scan driving circuit 12, and the timing control circuit 14 are disposed in a non-display area of the display panel 13.

In the display region 13a of the display panel 13, a plurality of data lines (Source lines) S1 to Sm and a plurality of scanning lines (Gate lines) G1 to Gn are provided in a grid pattern. The plurality of scan lines G1 to Gn extend along a first direction F1, and the plurality of data lines S1 to Sm extend along a second direction F2. The first direction F1 and the second direction F2 are perpendicular to each other.

The pixel cells 15 are provided at the alternate portions of the plurality of scanning lines G1 to Gn and the plurality of data lines S1 to Sm. In this embodiment, the pixel cells 15 are represented by P11-P1 m, P21-P2 m, \ 8230 \ 8230;, pn 1-Pnm, respectively.

The scanning lines G1 to Gn are connected to the scanning driving circuit 12 and receive scanning signals from the scanning driving circuit 12, and the Data lines S1 to Sm are connected to the Data driving circuit 11 and receive Data signals Data stored and transmitted in a gray scale format supplied from the Data driving circuit 11.

The pixel unit 15 receives the Data voltages corresponding to the gray levels in the Data signals Data provided by the Data lines S1 to Sm for a predetermined period of time under the control of the scan lines G1 to Gn, and accordingly drives the liquid crystal layer (not shown) to deflect a corresponding angle, so that the received backlight emits light rays with corresponding brightness according to the deflected corresponding angle, and image display is performed by emitting the light rays with corresponding brightness according to the image signals.

The timing control circuit 14 receives an image signal indicating image information, a clock signal CLK for synchronization, a horizontal synchronization signal Hsyn, and a vertical synchronization signal Vsyn from the step-down conversion circuit 22, and outputs a gate output control signal Cg for controlling the scanning drive circuit 12, a source output control signal Cs for controlling the Data drive circuit 11, and a Data signal Data indicating image information. In this embodiment, the timing control circuit 14 performs Data adjustment processing on the original Data signal to obtain a Data signal Data, and transmits the Data signal Data to the Data driving circuit 11.

The scanning drive circuit 12 receives the gate output control signal Cg outputted from the timing control circuit 14, and outputs scanning signals to the scanning lines G1 to Gn. The Data driving circuit 11 receives the source output control signal Cs output from the timing control circuit 14, and outputs Data signals Data for driving elements to perform image display in each pixel unit 15 in the display region 13a to the respective Data lines S1 to Sm. The Data signal Data supplied to the display panel 13 is a gray scale voltage in an analog form. The scan driving circuit 12 outputs a scan signal to control the pixel unit 15 to receive the Data signal Data output by the Data driving circuit 11 to control the pixel unit 15 to display a corresponding image.

Referring to fig. 4, fig. 4 is a circuit block diagram of the buck converter circuit of fig. 2.

As shown in fig. 4, the down-conversion circuit 22 includes an enable unit 221 and a down-conversion unit 222. The enabling unit 221 receives the power supply voltage VCC, and outputs an enabling signal EN to the voltage dropping unit 222 according to the power supply voltage VCC, where the enabling signal EN is used to start the voltage dropping unit 222 to perform voltage dropping processing on the power supply voltage VCC. The voltage dropping unit 222 is used for dropping the power voltage VCC and converting the power voltage VCC into a second group of driving voltages VDD2. The voltage reducing unit 222 may be a BUCK integrated circuit.

The voltage dropping unit 222 is connected to the transmission line N, and the voltage dropping unit 222 receives the enable signal EN from the enable unit 221, outputs the second set of driving voltages VDD to the transmission line N according to the enable signal EN, and transmits the second set of driving voltages VDD to the predetermined functional module, that is, the timing control circuit 14 through the transmission line N. The second group of driving voltages VDD2 are respectively transmitted to the signal generating unit 141 and the signal receiving unit 142 in the timing control circuit 14, and the signal generating unit 141 is configured to output a gate output control signal to the scan driving circuit 12 and a source output control signal to the data driving circuit 11 according to the second group of driving voltages VDD2. The signal receiving unit 142 is used for receiving an external original image signal according to a second set of driving voltages VDD2.

The buck conversion circuit 22 further includes a filtering and voltage-stabilizing unit 223 and a voltage-regulating feedback unit 224, where the filtering and voltage-stabilizing unit 223 is connected to the buck unit 222, and is configured to receive the second group of driving voltages VDD2 from the buck unit 222, perform filtering processing on the second group of driving voltages VDD2, filter out ripples in the second group of driving voltages VDD2, and control the second group of driving voltages VDD2 output by the buck unit 222 to be stable.

And the voltage-regulating feedback unit 224 is connected between the filtering and voltage-stabilizing unit 223 and the ground terminal E, and is configured to regulate the magnitude of the second group of driving voltages VDD2 in the transmission line N and feed back and output the feedback signal FB to the voltage-reducing unit 222 according to the regulated second group of driving voltages VDD2, and the voltage-reducing unit 222 regulates the magnitude of the output second group of driving voltages VDD2 according to the feedback signal FB.

The step-down converting circuit 22 further includes an electrostatic protection unit 225, and the electrostatic protection unit 225 is connected between the voltage regulating feedback unit 224 and the ground E, and is configured to perform electrostatic protection on the enabling unit 221, the step-down unit 222, the filtering and voltage stabilizing unit 223, and the voltage regulating feedback unit 224 connected in the transmission line N when the transmission line N transmits the second set of driving voltage VDD2.

Referring to fig. 5, fig. 5 is an equivalent circuit diagram of the buck converter circuit 22 in fig. 4.

As shown in fig. 5, the enabling unit 221 includes a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, wherein a first connection terminal CN1 of the first resistor R1 is connected to the power supply voltage VCC, and a second connection terminal CN2 is connected to the voltage dropping unit 222 for dividing the power supply voltage VCC and transmitting the divided power supply voltage VCC to the voltage dropping unit 222 as an enabling signal EN. The first capacitor C1 and the second capacitor C2 are respectively connected between the power supply voltage VCC and the ground terminal E, and are configured to perform filtering processing on the power supply voltage VCC. The third capacitor C3 and the fourth capacitor C4 are connected in parallel between the second connection terminal CN2 and the ground terminal E, and are configured to perform filtering processing on the power supply voltage VCC divided by the first resistor R1. The enabling unit 221 is configured to output an enabling signal EN to the voltage dropping unit 222 according to a power supply voltage VCC, wherein the resistance of the first resistor R1 may be 10K Ω, and the power supply voltage VCC may be 12V.

The voltage dropping unit 222 includes a first port G1, a second port G2, a third port G3, and a fourth port G4. The first port G1 receives the power supply voltage VCC, that is, the first port G1 is an ID port of the voltage dropping unit 222, and the second port G2 is connected to the enabling unit 221, and is configured to receive the enabling signal EN and convert the enabling signal EN to output the second group of driving voltages VDD2. The third port G3 is connected to the voltage regulation feedback unit 224, and is used for accessing the feedback signal FB from the voltage regulation feedback unit 224 and adjusting the magnitude of the second group of driving voltages VDD2 according to the feedback signal FB. The fourth port G4 is connected to the filter voltage stabilization unit 223 for outputting the driving voltage VDD to the filter voltage stabilization unit 223.

The filtering and voltage-stabilizing unit 223 includes a fifth capacitor C5, a sixth capacitor C6, a second resistor R2, a third resistor R3, and an inductor L, wherein one end of the fifth capacitor C5 is connected to the voltage-reducing unit 222, and the other end of the fifth capacitor C5 is sequentially connected in series with the second resistor R2 and the inductor L, and is configured to receive the second group of driving voltages VDD2 from the voltage-reducing unit 222 and perform filtering processing on the second group of driving voltages VDD2.

A first node Q1 is arranged between the second resistor R2 and the inductor L, the third resistor R3 and the sixth capacitor C6 are connected in series between the transmission line N and the first node Q1, one end of the third resistor R3 is connected between the second resistor R2 and the inductor L, and the other end of the third resistor R3 is connected to the sixth capacitor C6, so as to control the second group of driving voltages VDD2 to be stable within a preset range. The second resistor R2, the third resistor R3, the fifth capacitor C5 and the sixth capacitor C6 are arranged for controlling the received driving voltage VDD to tend to be stable, the inductor L is used for performing filtering processing on the received driving voltage, when the current flowing through the inductor L is increased, the self-induced electromotive force generated by the inductor L is opposite to the current direction so as to prevent the current from increasing, meanwhile, a part of electric energy is converted into magnetic field energy to be stored in the inductor L, when the current flowing through the inductor L is reduced, the self-induced electromotive force is the same as the current direction so as to prevent the current from decreasing, meanwhile, the stored energy is released so as to compensate the reduction of the current, and the current and voltage waveforms filtered by the inductor L become smooth.

The voltage regulation feedback unit 224 includes a fourth resistor R4, a fifth resistor R5, and a seventh capacitor C7. The fourth resistor R4 and the fifth resistor R5 are connected in series between the filtering and voltage stabilizing unit 223 and the ground E, and are configured to divide the second group of driving voltages VDD2 output by the filtering and voltage stabilizing unit, the seventh capacitor C7 is connected in parallel with the fourth resistor R4 and is configured to control the second group of driving voltages VDD2 to be within a preset range, the second node Q2 is located between the fourth resistor R4 and the fifth resistor R5, and the second node Q2 is connected to the third port G3 of the voltage reducing unit 222 and is configured to output the feedback signal FB to the voltage reducing unit 222 according to the voltage division of the second group of driving voltages VDD2 by the fifth resistor R5. The second group of driving voltages VDD2 output by the step-down converting circuit 22 can be controlled by controlling the resistances of the fourth resistor R4 and the fifth resistor R5, and the calculation formula is as follows: VDD2=0.6 (1 + R4/R5). Wherein 0.6 is a normal coefficient.

The electrostatic protection unit 225 includes an eighth capacitor C8, a ninth capacitor C9, a sixth resistor R6, and a diode D, wherein the eighth capacitor C9, the sixth resistor R6, and the diode D are connected in parallel between the transmission line N and the ground E, and are configured to perform electrostatic protection on an element connected to the transmission line N. Meanwhile, the eighth capacitor C8, the ninth capacitor C9 and the sixth capacitor C6 are connected in parallel and configured to perform filtering processing on the second group of driving voltages VDD2, and the diode D is configured to clamp the second group of driving voltages VDD2 within a preset range. The diode D is a Transient Voltage Super (TVS).

Referring to fig. 6, fig. 6 is a block diagram of an internal circuit of a display device according to a first comparative embodiment of the present application. As shown in fig. 6, the power module 20' is electrically connected to the display module 10 and is used for providing the display module 10 with a first set of driving voltages VDD1 and a second set of driving voltages VDD2.

The power module 20' includes a power management system 21 and a power module 23, wherein the power management system 21 is electrically connected to the power module 23, and is configured to receive a power voltage VCC from the power module 23 and convert the power voltage VCC into a first group of driving voltages VDD1 and a second group of driving voltages VDD2.

The power management system 21 is electrically connected to the data driving circuit 11, the scan driving circuit 12, the display panel 13 and the timing control circuit 14, and is configured to output a first set of driving voltages VDD1 to the data driving circuit 11, the scan driving circuit 12 and the display panel 13, and output a second set of driving voltages VDD2 to the timing control circuit 14. That is, the power management system 21 provides the display module 10 with a driving voltage for displaying images.

Because the timing control circuit 14 needs to output the control signal to the data driving circuit 11 and the scan driving circuit 12 at the same time to control the data driving circuit 11 to output the data signal and control the scan driving circuit 12 to output the scan signal, when the power management system 21 outputs the second group of driving voltages VDD2 to the timing control circuit 14, a large pumping current is needed to maintain the normal operation of the timing control circuit 14, which results in a large load on the power management system 21, and when the display panel 13 displays a complicated 4K video or picture, the load on the timing control circuit 14 is increased, which further increases the pumping current, and at the same time, the power management system 21 needs to provide the driving voltages for the operation of the data driving circuit 11, the scan driving circuit 12, and the display panel 13, which further increases the load on the power management system 21 and the temperature, which easily exceeds the temperature threshold of the power management system 21, which makes the power management system 21 enter a protection state, which further causes the display panel 13 to stop displaying.

Compared with the power module 20' in the first comparative embodiment, the power module 20 provided in the embodiment shown in fig. 2-5 of the present application has the step-down converting circuit 22 independently disposed, so that the step-down converting circuit 22 outputs the second group of driving voltages VDD2 to the timing control circuit 14, thereby effectively transferring the load of the power management system 21 to the step-down converting circuit 22, reducing the load of the power management system 21, and also reducing the operating temperature of the power management system, and meanwhile, the step-down converting circuit 22 only needs to provide the driving voltages for the timing control circuit 14, so that the load of the step-down converting circuit 22 is within a controllable range, and the operating temperature is far lower than the temperature threshold, so that the overall temperature of the power module 20 is reduced. The step-down conversion circuit 22 occupies a small space, is arranged in the power module 20, does not need to change the overall layout of the power module 20, and has a low production cost for the step-down conversion circuit 22, so that the load and the working temperature of the power management system 21 are reduced while the low cost is kept. It will be understood that the invention is not limited to the examples described above, but that modifications and variations will occur to those skilled in the art in light of the above teachings, and that all such modifications and variations are considered to be within the scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a power module, its characterized in that, includes power module, power management system and step-down transform circuit, power module is used for output mains voltage, power management system electric connection power module, just power management system receives mains voltage and converts first group's driving voltage into, step-down transform circuit electric connection power module, and receive mains voltage and convert second group's driving voltage into, second group's driving voltage is less than mains voltage.

2. The power module as claimed in claim 1, wherein the buck converter circuit includes an enable unit and a buck unit, the enable unit is electrically connected to the buck unit, the enable unit receives the power voltage and outputs an enable signal to the buck unit according to the power voltage, the enable signal is used to start the buck unit to perform buck processing on the power voltage;

the voltage reduction unit is used for reducing the voltage of the power supply and converting the voltage into the second group of driving voltages.

3. The power module as claimed in claim 2, wherein the buck converter circuit further comprises a filter voltage stabilization unit and a voltage regulation feedback unit, the filter voltage stabilization unit is electrically connected to the buck unit, and is configured to receive the second set of driving voltages from the buck unit and perform filtering processing on the second set of driving voltages;

the voltage regulation feedback unit is connected between the filtering voltage stabilization unit and the grounding end and used for regulating the magnitude of the second group of driving voltages in the transmission line, and feeding back and outputting a feedback signal to the voltage reduction unit according to the regulated second group of driving voltages, and the voltage reduction unit regulates the magnitude of the second group of driving voltages according to the feedback signal.

4. The power module as claimed in claim 3, wherein the buck converter circuit further comprises an electrostatic protection unit, and the electrostatic protection unit is connected between the voltage regulation feedback unit and the ground terminal, and is configured to perform electrostatic protection on the enabling unit, the voltage reduction unit, the filtering and voltage stabilization unit, and the voltage regulation feedback unit, which are connected in sequence.

5. The power module as claimed in claim 4, wherein the enable unit includes a first resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, a first connection end of the first resistor is connected to the power voltage, a second connection end of the first resistor is connected to the voltage reduction unit for dividing the power voltage, the first capacitor and the second capacitor are connected in parallel between the power voltage and the ground terminal for filtering the power voltage, and the third capacitor and the fourth capacitor are connected in parallel between the second connection end and the ground terminal for filtering the power voltage divided by the first resistor and outputting the filtered power voltage to the voltage reduction unit as the enable signal.

6. The power module according to claim 4 or 5, wherein the voltage dropping unit includes a first port, a second port, a third port and a fourth port, the first port receives the power voltage, the second port is connected to the enabling unit for receiving the enabling signal and outputting the second set of driving voltages in a conversion manner when the enabling signal is enabled, the third port is connected to the voltage regulation feedback unit for receiving the feedback signal from the voltage regulation feedback unit, the voltage dropping unit adjusts the second set of driving voltages according to the feedback signal, the fourth port is connected to the filtering and voltage stabilizing unit, and the voltage dropping unit outputs the second set of driving voltages to the filtering and voltage stabilizing unit through the fourth port.

7. The power module as claimed in claim 6, wherein the filtering and voltage-stabilizing unit comprises a fifth capacitor, a sixth capacitor, a second resistor, a third resistor, an inductor and a first node, one end of the fifth capacitor is connected to the voltage-dropping unit, and the other end of the fifth capacitor is connected in series with the second resistor and the inductor in turn, and is configured to receive the second set of driving voltages from the voltage-dropping unit and filter the second set of driving voltages;

the first node is located between the second resistor and the inductor, and the third resistor and the sixth capacitor are connected in series between the first node and the ground terminal and used for controlling the second group of driving voltages to be stable within a preset range.

8. The power module as claimed in claim 7, wherein the voltage regulation feedback unit includes a fourth resistor, a fifth resistor, a seventh capacitor and a second node, the fourth resistor and the fifth resistor are connected in series between the filtering voltage regulation unit and the ground terminal for dividing the second set of driving voltages output by the filtering voltage regulation unit, the seventh capacitor is connected in parallel with the fourth resistor for controlling the second set of driving voltages to be within a predetermined range, the second node is located between the fourth resistor and the fifth resistor, and the second node is connected to the third port of the voltage reduction unit for outputting the feedback signal to the voltage reduction unit according to the divided voltage of the fifth resistor on the second set of driving voltages.

9. The power module as claimed in claim 8, wherein the esd protection unit comprises an eighth capacitor, a ninth capacitor, a sixth resistor, and a diode, the eighth capacitor, the ninth capacitor, the sixth resistor, and the diode are connected in parallel between the voltage regulation feedback unit and the ground terminal, and are configured to perform esd protection on the enabling unit, the voltage dropping unit, the filtering and voltage stabilizing unit, and the voltage regulation feedback unit, meanwhile, the eighth capacitor, the ninth capacitor, and the sixth capacitor are connected in parallel and are configured to perform filtering processing on the second set of driving voltages, and the diode is configured to clamp the second set of driving voltages within a preset range.

10. A display device, comprising a power module as claimed in any one of claims 1 to 9 and a display module, wherein the display module comprises a data driving circuit, a scan driving circuit, a timing control circuit and a display panel;

the data driving circuit, the scanning driving circuit and the display panel are connected to the power management system and used for receiving the first group of driving voltages from the power management system;

the time sequence control circuit is connected with the voltage reduction conversion circuit and receives the second group of driving voltages, and outputs a grid electrode output control signal to the scanning driving circuit and a source electrode output control signal to the data driving circuit under the driving of the second group of driving voltages;

the data driving circuit outputs a data signal to the display panel according to the first group of driving voltages and the source electrode output control signal, the scanning driving circuit outputs a scanning signal to the display panel according to the first group of driving voltages and the gate electrode output control signal, and the display panel displays an image according to the data signal and the scanning signal.