Display device

Abstract

The application provides a display device, wherein a power adjustment module is arranged in a power supply circuit of the display device, energy transmission between voltages respectively output by the power supply circuit to a mainboard and an LED light bar is performed by the power adjustment module, voltages respectively provided by the power supply circuit to the mainboard and the LED light bar are within respective preset voltage ranges, and adjustment of a large voltage value is not required, so that the working efficiency of the entire power supply circuit can be improved, and the cost of the power supply circuit and the display device can be reduced.

Description

Technical Field

[0001] This application relates to the field of display device technology, and more particularly to a display device. Background Technology

[0002] With the development of electronic technology, electronic devices, including televisions and other display devices, are becoming increasingly integrated, which places higher demands on their power supplies. Currently, most display devices receive AC power via a plug and then use a dedicated power supply circuit to convert the AC power to DC and transform the voltage to supply power to the loads within the display device.

[0003] Employing relevant technologies, the power supply circuit of a display device includes at least the following modules: a rectifier bridge, a power factor correction (PFC) module, and a resonant converter circuit (LLC) module. The power supply circuit supplies power to the motherboard and LED strips within the display device via different secondary windings within the LLC module. To adjust the voltage supplied to the LED strips, some display devices also include a voltage adjustment module between the LLC module and the LED strips.

[0004] However, when the voltage regulation module is under heavy load, it reduces the efficiency of the entire power supply circuit. Therefore, how to reduce the workload of the voltage regulation module is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This application provides a display device for reducing the workload of the voltage adjustment module in the power supply circuit of the display device.

[0006] The display device provided in the first aspect of this application includes: a circuit board; a display screen configured to display an image; an LED light strip configured to illuminate the display screen; and a power supply circuit configured to supply power to a load on the circuit board and the LED light strip. The power supply circuit includes: a first power supply branch configured to output a first voltage to the circuit board; a second power supply branch configured to output a second voltage to the LED light strip; and a power adjustment module, with a first terminal connected to the first power supply branch and a second terminal connected to the second power supply branch. The power adjustment module is configured to control energy transfer between the first power supply branch and the second power supply branch.

[0007] In one embodiment of the first aspect of this application, the power adjustment module is specifically configured to control the second power supply branch to output energy to the first power supply branch when the second voltage is greater than a first preset threshold; and to control the first power supply branch to output energy to the second power supply branch when the second voltage is less than a second preset threshold.

[0008] In an embodiment of the first aspect of the application, the power adjustment module comprises: a voltage reduction branch configured to output, from the first end, after voltage reduction processing of the voltage of the second end; and a voltage increase branch configured to output, from the second end, after voltage increase processing of the voltage of the first end.

[0009] In an embodiment of the first aspect of the application, the power adjustment module further comprises: a controller configured to control the voltage reduction branch or the voltage increase branch to be in an operating state according to the second voltage.

[0010] In an embodiment of the first aspect of the application, the power adjustment module specifically comprises: a first switch, a second switch, a capacitor, and an inductor, which constitute the voltage increase branch or the voltage reduction branch; wherein a first end of the inductor is connected to the first power supply branch, a second end of the inductor is connected to a first end of the first switch and a first end of the second switch, a second end of the first switch is connected to a first end of the capacitor and the second power supply branch, a second end of the second switch is grounded, a second end of the capacitor is grounded, and the controller is connected to a control end of the first switch and a control end of the second switch.

[0011] In an embodiment of the first aspect of the application, the power adjustment module specifically comprises: a controller, a third switch, a fourth switch, and a transformer, which constitute the voltage increase branch or the voltage reduction branch; wherein a first end of a primary side of the transformer is connected to the first power supply branch, a first end of a secondary side of the transformer is connected to the second power supply branch, a second end of the primary side of the transformer is connected to a first end of the third switch, a second end of the secondary side of the transformer is connected to a first end of the fourth switch, second ends of the third switch and the fourth switch are grounded, and the controller is connected to a control end of the third switch and a control end of the fourth switch.

[0012] In an embodiment of the first aspect of the application, the power adjustment module further comprises: an output detection module, a first end of which is connected to the power adjustment module, and a second end of which is connected to a voltage conversion module in the power supply circuit; the output detection module is configured to acquire a power parameter output from the first end or the second end of the power adjustment module, and send a feedback signal to the voltage conversion module according to the power parameter.

[0013] In an embodiment of the first aspect of the application, the voltage conversion module is configured to adjust the first voltage output by the first power supply branch when the power parameter does not meet a preset condition.

[0014] The second aspect of the application provides a display device, comprising: a circuit board; a display screen configured to display an image picture; an LED light bar configured to light up the display screen; a power supply circuit configured to supply power to a load on the circuit board and the LED light bar; the power supply circuit comprises: a first power supply branch configured to output a first voltage to the circuit board; a second power supply branch configured to output a second voltage; a third power supply branch configured to output a third voltage to the circuit board and a voltage adjustment module; a voltage adjustment module configured to adjust the third voltage to a fourth voltage and then output the sum of the third voltage and the fourth voltage to the LED light bar; an output detection module, a first end of the output detection module being connected to the voltage adjustment module, and a second end of the output detection module being connected to a voltage conversion module in the power supply circuit; the output detection module is configured to obtain a power parameter output by the voltage adjustment module and send a feedback signal to the voltage conversion module according to the power parameter.

[0015] In an embodiment of the second aspect of the application, the voltage conversion module is configured to adjust the first voltage output by the first power supply branch when the power parameter does not meet a preset condition.

[0016] In summary, the display device provided by the embodiments of the application. When the voltage provided by the power supply circuit to the LED light bar changes, the power adjustment module does not need to make a large voltage adjustment, which can control the voltage stability of the LED light bar to ensure the stability of the entire power supply circuit and the display device, improve the working efficiency of the entire power supply circuit, and reduce the design and manufacturing cost of the power supply circuit and the display device under the condition of reducing the adjustment requirement of the power adjustment circuit. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application and the related technical solutions, the following will briefly introduce the drawings needed to be used in the embodiments and the related technical solutions. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of these drawings.

[0018] Figure 1 A structural schematic diagram of a display device provided with a separate power board;

[0019] Figure 2 A schematic diagram of the connection relationship between the power board and the load;

[0020] Figure 3 A schematic diagram of a television power architecture;

[0021] Figure 4 A schematic diagram of a power supply circuit structure for supplying power to a main board and an LED light bar;

[0022] Figure 5 Another power supply circuit structure diagram for supplying power to the main board and the LED light bar is shown;

[0023] Figure 6 A structure diagram of an embodiment of the display device provided in the present application is shown;

[0024] Figure 7 A structure diagram of an embodiment of the power adjustment module provided in the present application is shown;

[0025] Figure 8 A circuit structure diagram of an embodiment of the power adjustment module provided in the present application is shown;

[0026] Figure 9 A circuit structure diagram of another embodiment of the power adjustment module provided in the present application is shown;

[0027] Figure 10 A structure diagram of another embodiment of the display device provided in the present application is shown;

[0028] Figure 11 A structure diagram of still another embodiment of the display device provided in the present application is shown;

[0029] Figure 12 A flow diagram of an embodiment of the control method of the display device provided in the present application is shown. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described in the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0032] The following section, with reference to the accompanying drawings, explains the application scenario and existing problems of this application. As people's need for information acquisition continues to deepen, various types of display devices have emerged, such as computers, televisions, and projectors. The power supply circuit is one of the most important circuit structures in a display device, providing electrical energy to enable its normal operation. Some display devices have independent power boards, placing the main board and power board on two separate circuit boards; others combine the power board and main board into one, placing them on the same circuit board.

[0033] Taking a display device with an independent power supply board as an example, the structure of the display device will be explained. See [link / reference]. Figure 1 As shown, Figure 1 This is a schematic diagram of a display device with an independent power supply board, such as... Figure 1 As shown, the display device includes a panel 1, a backlight assembly 2, a motherboard 3, a power board 4, a back cover 5, and a base 6. The panel 1 is used to display the image to the user. The backlight assembly 2, located below the panel 1, typically consists of optical components that provide sufficient brightness and a uniformly distributed light source, enabling the panel 1 to display images correctly. The backlight assembly 2 also includes a backplate 20, on which the motherboard 3 and power board 4 are mounted. Typically, raised structures are stamped into the backplate 20, and the motherboard 3 and power board 4 are fixed to these raised structures with screws or hooks. The back cover 5 covers the panel 1 to conceal the backlight assembly 2, motherboard 3, and power board 4, achieving an aesthetically pleasing appearance. The base 6 supports the display device.

[0034] Furthermore, Figure 2 This is a schematic diagram showing the connection relationship between the power supply board and the load, such as... Figure 2 As shown, the power board 4 includes an input terminal 41 and an output terminal 42 (first output terminal 421, second output terminal 422, and third output terminal 423 are shown in the figure). The input terminal 41 is connected to AC mains power, and the output terminal 42 is connected to the load. For example, the first output terminal 421 is connected to an LED strip used to light up the display screen, the second output terminal 422 is connected to speakers, and the third output terminal 423 is connected to the motherboard. The power board 4 needs to convert AC mains power into DC power required by the load, and this DC power typically has different specifications; for example, speakers require 18V, while the motherboard requires both 12V and 18V.

[0035] Specifically, the power architecture of a display device will be introduced using a television as an example. Figure 3 This is a schematic diagram of a TV power supply architecture, such as... Figure 3As shown, the display device may include: a power supply circuit 1, a load 2, a control circuit 3, and a power supply 4. The power supply 4 includes: a rectifier bridge 41, a power factor correction (PFC) module 42, and a resonant converter (LLC) module 43. The LLC module 43 includes a synchronous rectification circuit (…). Figure 3 (Not shown). PFC module 42 is connected to LLC module 43, and LLC module 43 is connected to power circuit 1 and control circuit 3 respectively.

[0036] The rectifier bridge 41 rectifies the input AC power, supplying a full-wave signal to the PFC module 42. An electromagnetic interference (EMI) filter can be connected before the AC power input to the PFC module 42. Figure 3 (Not shown), performs high-frequency filtering on the input AC power supply.

[0037] The PFC module 42 typically includes a PFC inductor, switching power devices, and a PFC control chip. It mainly performs power factor correction on the input AC power supply and outputs a stable DC bus voltage (such as 380V) to the LLC module 43. The PFC module 41 can effectively improve the power factor of the power supply and ensure that the voltage and current are in phase.

[0038] LLC module 43 can employ a dual-MOSFET LLC resonant converter circuit. Typically, a synchronous rectification circuit is incorporated within LLC module 43, which mainly includes a transformer, controller, two MOSFETs, and diodes. Additionally, LLC module 43 may include a pulse frequency modulation (PFM) circuit, capacitors, and inductors. Specifically, LLC module 43 can step down or boost the DC bus voltage input to PFC module 42 and output a constant voltage to load 2. Typically, LLC module 43 can output various voltages to meet the needs of load 2. Alternatively, as... Figure 3 The LLC module shown can also be replaced by a flyback module, which steps down or boosts the voltage before outputting it to the load. Alternatively, as... Figure 3 The LLC module shown can also be a voltage conversion module of any other topology, such as a full bridge.

[0039] Power supply 4 may also include a flyback module ( Figure 3 (Not shown), used to provide its own power supply voltage and standby power to PFC module 42 and LLC module 43.

[0040] The control circuit 3 is connected with the power supply 4 and the power supply circuit 1 respectively, and can control whether the power supply circuit 1 is turned on, that is, whether the power supplied by the LLC module 43 can be supplied to the load 2, so as to realize the opening or closing of the load. Usually, the control circuit 3 can receive the control signal of the main chip (not shown in the Figure 3 ) and control the working state of the power supply circuit 1 under the control of the main chip.

[0041] The power supply circuit 1 is also connected with the LLC module and the load. When the power supply circuit 1 is connected, the LLC module 43 can supply power to the load 2. When the power supply circuit 1 is disconnected, the LLC module 43 cannot supply power to the load 2. In fact, the power supply circuit 1 usually includes a switching element (not shown in the Figure 3 ), such as a MOS tube. The control circuit 3 controls the on-off state of the MOS tube by controlling the voltage between the source and the gate of the MOS tube.

[0042] The load 2 includes a main board 21, a backlight assembly 22, a display body 23 and the like. The main board 21 includes a control unit and the like, can receive the voltage output by the LLC module 43, and input the coded audio and video signals to the display body 23. Optionally, the main board 21 usually needs 12V voltage. The backlight assembly 22 can receive the voltage output by the LLC module 43 to realize the display of the display body 23. The display body 23 can include but is not limited to a liquid crystal display.

[0043] More specifically, taking a television as an example, Figure 4 a power supply circuit structure diagram for supplying power to the main board and the LED light bar is shown. In the power supply circuit, the mains alternating current (100V-240V, 50-60Hz) obtained by the power supply circuit passes through a filtering and rectifying module (rectifier bridge), a PFC module and an LLC module in turn, and then supplies power to the main board of the display device, the LED light bar as the backlight assembly and other loads. The other loads are not shown in the Figure 4 . Among them, the first secondary winding in the LLC module provides 12V voltage to the main board, the second secondary winding provides 18V voltage to the main board, and the third secondary winding provides voltage to the LED light bar.

[0044] Since the voltage range required by the LED light bar is related to the working environment of the multi-channel LED light bar, the hardware characteristics and service life of the LED assembly and the like, the voltage required by the multi-channel LED light bar has a certain fluctuation range, and the fluctuation range is limited. Therefore, the secondary winding for supplying power to the multi-channel LED light bar in the LLC module is additionally connected with a voltage adjusting module (such as a buck circuit or a boost circuit, Figure 4The voltage adjustment module can adjust the voltage directly output by the secondary winding and transmit the adjusted voltage to the voltage driving module according to the real-time current feedback of the plurality of LED light bars, so that the voltage driving module controls the plurality of LED light bars to work at the rated current according to the received voltage, thereby preventing the damage of the LED components in the plurality of LED light bars caused by the excessive current.

[0045] Figure 5 Another power supply circuit structure for supplying power to the main board and the LED light bar is shown, wherein, unlike the power supply circuit shown in Figure 4 The power supply circuit in the embodiment adopts the form of "step power supply" by using two different LLC secondary windings in the LLC module to supply power to the LED light bar. Specifically, the power supply circuit includes three power supply branches, the first power supply branch includes the first secondary winding in the LLC module and is configured to output the first voltage of 12V to the main board, the second power supply branch includes the second secondary winding in the LLC module and is configured to output the second voltage as a fixed voltage, and the third power supply branch includes the third secondary winding in the LLC module and is configured to output the third voltage of 16V / 18V. Then, the voltage adjustment module (low-voltage buck / boost) converts the third voltage into the fourth voltage and provides the sum of the third voltage and the fourth voltage to the LED light bar. In the process of supplying power to the LED light bar, since two different voltages output by the two different secondary windings are flexibly set, and the voltage adjustment module only needs to adjust the voltage output by the secondary winding with the smaller voltage, the requirement for the withstand voltage of the elements such as the switch tube and the capacitor in the voltage adjustment module is reduced, thereby reducing the area of the PCB on which the power supply circuit is located, and finally reducing the cost of the power supply circuit.

[0046] However, the circuit structure of the power supply circuit shown in Figure 4 is relatively complex, the power supply efficiency is relatively low, and the relative cost is relatively high. Therefore, the circuit structure shown in Figure 5 can be used to reduce the structural complexity of the power supply circuit, but in the power supply circuit shown in Figure 5 , the LLC module outputs different voltages by using the same set of transformers, so that when the step power supply is implemented, the working load of the voltage adjustment module is large when the voltage adjustment module outputs a large voltage, the output voltage of the voltage adjustment module cannot be set to an ideal value, and the working efficiency of the entire power supply circuit is reduced.

[0047] For example, suppose the 12V output voltage of the transformer secondary of the LLC module is achieved through 2 turns of winding, where 1 turn of winding corresponds to 6V. When the LED strip requires a working voltage of 36V, to prevent the transformer output voltage from being too high and unable to be adjusted, the transformer secondary can output a fixed voltage of 30V through 5 turns of winding, instead of directly setting it to output a fixed voltage of 36V. In this case, the voltage adjustment module needs to output a floating voltage of 6V, and then supply the LED strip with the 30V fixed voltage plus the 6V floating voltage. The 6V voltage is relatively large for the voltage adjustment module to output, making it impossible to set the output voltage of the voltage adjustment module to the ideal value, thus reducing the working efficiency of the entire power supply circuit.

[0048] Therefore, this application also provides a display device, in which a power adjustment module is provided in the power supply circuit of the display device. The power adjustment module performs energy transfer between the voltages output by the power supply circuit to the motherboard and the LED light strip respectively, so that the voltages provided by the power supply circuit to the motherboard and the LED light strip are within their respective preset voltage ranges, and no large voltage adjustment is required. This can improve the working efficiency of the entire power supply circuit and reduce the cost of the power supply circuit and the display device.

[0049] Figure 6 A schematic diagram of the structure of an embodiment of the display device provided in this application is shown below. Figure 6 The display device shown includes: a circuit board and a display screen (not shown in the diagram). Figure 6 (As shown in the diagram), LED light strip 16 and power supply circuit. The processor and other modules and circuits of the display device can be mounted on the circuit board. The processor provides the content of the display screen, the display screen is configured to display the content, the LED light strip 16 is configured to illuminate the display screen, and the power supply circuit is configured to supply power to the loads in the display device, including the display screen, LED light strip 16, and loads on the circuit board.

[0050] In some embodiments, such as Figure 6 As shown, the display device includes an independent power supply board, meaning the display device includes a power supply board and a motherboard. The power supply board includes power supply circuitry, and the motherboard includes loads such as a processor. In this case, the circuit board is... Figure 6The power supply circuit in the power supply board 10 can supply power to the main board 15 and the LED light bar 16. For example, the power supply circuit can supply two voltages of 12V and 18V to the main board 15, and supply a rated voltage of, for example, 35V to the LED light bar 16. In other embodiments, the main board and the power supply board in the display device can also be arranged on the same circuit board, so that the circuit board includes the power supply circuit and the processor and other loads. At this time, the power supply circuit can supply power to the processor and other loads on the circuit board through the circuit board, and also supply voltages of, for example, 12V and 18V to other loads on the circuit board.

[0051] In some embodiments, as shown in Figure 6 The power supply circuit specifically includes: a power supply 11, a filter rectifier module 12, a PFC module 13, a voltage conversion module, and in the embodiments of the present application, the voltage conversion module is taken as an example of an LLC module 14. The voltage conversion module can also be a module of a flyback, full-bridge, or other topology. After receiving the direct current voltage sent by the PFC module 13, the LLC module 14 first converts it into alternating current, and then passes through the primary winding 141 of the transformer. Different secondary windings of the transformer output different voltages according to the voltage of the primary winding 141 to supply power to subsequent loads. For example, the secondary winding 142 outputs a voltage of 12V to the main board 15 according to the voltage of the primary winding 141, the secondary winding 143 outputs a voltage of 18V to the main board 15 according to the voltage of the primary winding 141, and the secondary winding 144 outputs a voltage of 35V to the LED light bar 16 according to the voltage of the primary winding 141. In the embodiments of the present application, the power supply 11, the filter rectifier module 12, the PFC module 13, the primary winding 141 and the secondary winding 142 of the LLC module 14 in the power supply circuit are referred to as a first power supply branch, and the voltage output by the first power supply branch to the main board is referred to as a first voltage. The power supply 11, the filter rectifier module 12, the PFC module 13, the primary winding 141 and the secondary winding 144 of the LLC module 14 in the power supply circuit are referred to as a second power supply branch, and the voltage output by the second power supply branch to the LED light bar is referred to as a second voltage.

[0052] In particular, in the embodiments of the present application, the power supply circuit further includes a power adjustment module 17. As shown in Figure 6 The first end of the power adjustment module 17 is connected to the first power supply branch through point A, and the second end is connected to the second power supply branch through point B. Since the power adjustment module 17 is arranged between the first power supply branch and the second power supply branch, the power adjustment module 17 can be used to control the energy transmission between the first power supply branch and the second power supply branch, realize the dynamic balance between the energy output by the two power supply branches, and thus realize the change of the second voltage output by the second power supply branch to the LED light bar, so that it is stabilized within the rated voltage range required by the LED light bar.

[0053] Figure 7 This is a schematic diagram of the structure of an embodiment of the power adjustment module provided in this application, as shown below. Figure 7 A schematic diagram of the implementation logic of a power adjustment module is shown. The power adjustment module 17 specifically includes a boost branch and a buck branch, belonging to a circuit capable of bidirectional energy transmission. The boost branch is configured to boost the voltage at point A, the first terminal of the power adjustment module 17, and then output it from point B, the second terminal of the power adjustment module 17. The boost branch can be implemented as a Boost circuit, etc. The buck branch is configured to reduce the voltage at point B, the second terminal of the power adjustment module 17, and then output it from point A, the first terminal of the power adjustment module 17. The buck branch can be implemented as a Buck circuit, etc.

[0054] In some embodiments, such as Figure 7 The power adjustment module shown also includes a controller, which can be a processing unit such as a CPU, MCU, or SoC. The controller is configured to control the power adjustment module 17 to operate in buck branch mode based on whether the second voltage currently operating on the LED light strip meets preset conditions. In buck branch mode, the second power supply branch outputs energy to the first power supply branch to reduce the second voltage supplied to the LED light strip. Alternatively, the power adjustment module 17 can be controlled to operate in boost branch mode, the first power supply branch outputs energy to the second power supply branch to increase the second voltage supplied to the LED light strip.

[0055] Among them, such as Figure 7 The power supply circuit shown can be designed so that the first voltage output from the first power supply branch to the motherboard and the second voltage output from the second power supply branch to the LED strip are both within their respective rated operating voltage ranges. For example, the first power supply branch outputs a 12V first voltage to the motherboard, and the second power supply branch outputs a 35V second voltage to the LED strip. However, due to insufficient coupling between the secondary windings in the first and second power supply branches, any change in the load connected to either power supply circuit will cause a change in the actual voltage output to the motherboard and the LED strip, disrupting this balance. Simultaneously, because the first power supply branch has a closed-loop feedback function, the feedback circuit sends a feedback signal to the LLC module based on the first voltage output from the first power supply branch, causing the LLC module to maintain the first voltage output from the first power supply branch to the motherboard at 12V.

[0056] Therefore, if the load on the motherboard or the LED strip changes, and the first voltage output from the first power supply branch remains unchanged, the second voltage output from the second power supply branch to the LED strip will increase, for example, exceeding the first preset threshold. In this case, the power adjustment module needs to reduce the voltage output from the second power supply branch by controlling the energy flow from the second power supply branch to the first power supply branch, thus lowering the second voltage output from the second power supply branch to the LED strip and maintaining the stability of the entire power supply system. Conversely, if the second voltage output from the second power supply branch to the LED strip is lower than the second preset threshold, the power adjustment module needs to boost the voltage output from the second power supply branch by controlling the energy flow from the first power supply branch to the second power supply branch, thus increasing the second voltage output from the second power supply branch to the LED strip and maintaining the stability of the entire power supply system. Therefore, the power supply circuit in the display device provided in this application embodiment can control the voltage of the LED light strip to stabilize the entire power supply circuit and display device when the voltage supplied to the LED light strip changes. It can also improve the working efficiency of the entire power supply circuit and reduce the design and manufacturing costs of the power supply circuit and display device by reducing the adjustment requirements of the power adjustment circuit.

[0057] Figure 8 A circuit structure diagram of an embodiment of the power adjustment module provided in this application is shown below. Figure 8 As shown, the power adjustment module provided in this embodiment includes: a controller, a first switch M1, a second switch M2, a capacitor C, and an inductor L. The first end of the inductor L is connected to point A of the first power supply branch, and the second end of the inductor L is connected to the first end of the first switch M1 and the first end of the second switch M2. The second end of the first switch M1 is connected to the first end of the capacitor C and point B of the second power supply branch. The second end of the second switch M2 is grounded, and the second end of the capacitor C is grounded. The controller is connected to the control terminal of the first switch M1 and the control terminal of the second switch M2. Voltage divider resistors R11 and R12 can be used to send a feedback signal FB1 to the LLC module based on the first voltage supplied to the motherboard 15 by the first power supply branch, causing the LLC module to adjust the first voltage output to the motherboard from the first power supply branch to maintain its stability. Voltage divider resistors R21 and R22 can be used to send a feedback signal FB2 to the controller based on the second voltage supplied to the LED strip 16 by the second power supply branch, causing the controller to adjust the second voltage supplied to the LED strip 16 by the second power supply branch by adjusting the opening and closing sequence of the first switch M1 and the second switch M2 to maintain its stability.

[0058] In some embodiments, when such Figure 8The controller, based on feedback signal FB2, determines that the second voltage supplied to the LED strip 16 is greater than the first preset threshold, requiring voltage reduction at point B. In this case, the controller controls inductor L, first switch M1, and second switch M2 to form a voltage reduction branch. First, the controller opens first switch M1 and closes second switch M2, charging inductor L with the voltage at point B. Then, it closes first switch M1 and opens second switch M2, releasing energy from inductor L to point A on the left, thus reducing the voltage at point B. Conversely, when the controller determines that the second voltage supplied to the LED strip 16 is less than the second preset threshold, requiring voltage boosting at point B, the controller controls inductor L, first switch M1, and second switch M2 to form a voltage boost branch. First, the controller closes first switch M1 and opens second switch M2, charging inductor L1 with the voltage at point A. Then, it opens first switch M1 and closes second switch M2, releasing energy from inductor L to point B on the right, thus boosting the voltage at point B.

[0059] Figure 9 A circuit structure diagram of another embodiment of the power adjustment module provided in this application is shown below. Figure 9 As shown, the power adjustment module provided in this embodiment includes a controller, a third switch M3, a fourth switch M4, and a transformer U. The first end of the primary winding of transformer U is connected to point A of the first power supply branch, the first end of the secondary winding of transformer U is connected to point B of the second power supply branch, the second end of the primary winding of transformer U is connected to the first end of the third switch M3, the second end of the secondary winding of transformer U is connected to the first end of the fourth switch M4, the second ends of the third switch M3 and the fourth switch M4 are grounded, and the controller is connected to the control terminal of the third switch M3 and the control terminal of the fourth switch M4. The number of turns in the primary winding of transformer U is greater than the number of turns in the secondary winding.

[0060] In some embodiments, when such Figure 9The controller determines according to the feedback signal FB2 that the second voltage provided for the LED light bar 16 to work is greater than the first preset threshold value, and the voltage at point B needs to be stepped down. At this time, the controller controls the transformer U, the third switch M3 and the fourth switch M4 to form a step-down branch. The controller first controls the third switch M3 to be turned on and the fourth switch M4 to be turned off, so that the voltage at point B charges the transformer U. Then the controller controls the third switch M3 to be turned off and the fourth switch M4 to be turned on, so that the transformer U releases energy to the left side of point A, thereby achieving the step-down processing of the voltage at point B. When the controller determines according to the feedback signal FB2 that the second voltage provided for the LED light bar 16 to work is less than the second preset threshold value, the voltage at point B needs to be stepped up. At this time, the controller controls the transformer U, the third switch M3 and the fourth switch M4 to form a step-up branch. The controller first controls the third switch M3 to be turned off and the fourth switch M4 to be turned on, so that the voltage at point A charges the transformer U. Then the controller controls the third switch M3 to be turned on and the fourth switch M4 to be turned off, so that the transformer U releases energy to the right side of point B, thereby achieving the step-up processing of the voltage at point B.

[0061] In the foregoing embodiments of the present application, the power adjustment module 17 can achieve the transmission and adjustment of energy between the first power supply branch and the second power supply branch. However, if the voltage provided by the first power supply branch and the second power supply branch deviates greatly from the rated voltage of the mainboard and the LED light bar, the working load of the power adjustment module 17 will increase, the power supply circuit will be more complex, and in severe cases, the entire power supply system may even collapse. For example, the rated voltage of the mainboard is 12V, and the rated working voltage of the LED light bar is 35V. The secondary winding in the first power supply branch can be set to 2 turns, so that the first voltage output by the first power supply branch is 12V. The secondary winding in the second power supply branch can be set to 6 turns, so that the second voltage output by the second power supply branch is 36V. At this time, the power adjustment module 17 needs to work in the step-down mode to transfer the energy output by the second power supply branch to the first power supply branch, so that the LED light bar works at a voltage of 35V. The working load of the power adjustment circuit 17 is related to the coupling degree of the windings providing 12V and 35V. The better the coupling degree, the greater the working load. If the voltage of the LED light bar changes, the working load of the power adjustment module 17 will further increase.

[0062] Therefore, the present application also provides a display device, which can make the first power supply branch and the second power supply branch respectively provide more appropriate voltages, thereby reducing the working load of the power adjustment module 17 during adjustment. For example, Figure 10 The structure schematic diagram of another embodiment of the display device provided by the present application is shown in FIG. 6. Figure 10 The display device shown in FIG. 6 can make the first power supply branch and the second power supply branch respectively provide more appropriate voltages, thereby reducing the working load of the power adjustment module 17 during adjustment. Figure 6On the basis of the display device shown, the display device further comprises an output detection module 18. The first end of the output detection module 18 is connected to the first power supply branch, and the second end of the output detection module 18 is connected to the LLC module in the power supply circuit. The output detection module 18 can be used to send a feedback signal FB3 to the LLC module according to the power parameter output by any end of the power adjustment module 17, so as to dynamically feed back the workload of the power adjustment module 17 to the LLC module.

[0063] In some embodiments, the power parameter can be the output current, power, etc., and for the LLC module, after receiving the feedback signal FB3, if the power parameter indicated by the FB3 does not meet the preset condition, the LLC module can adjust the first voltage output by the first power supply branch, indirectly causing the second voltage output by the second power supply branch to change, so that the power adjustment circuit operates in the expected working compliance. For example, assuming that the LLC module determines that the current output by the power adjustment module is greater than the preset value according to the FB3, the first voltage output by the first power supply branch can be reduced. Taking the working voltage of the LED light bar as 35V for example, when the second voltage provided to the LED light bar is greater than the preset value, so that the current output by the power adjustment module is greater than the preset value in the process of transferring the energy of the second power supply branch to the first power supply branch, it indicates that the workload of the power adjustment module is large. At this time, the LLC module reduces the first voltage output by the first power supply branch from 12V to 35 / 6*2=11.67V, and then the second voltage provided to the LED light bar can be stabilized at 35V again, while the workload of the power adjustment module is reduced, and the power efficiency of the power adjustment module and the power supply circuit is improved. At the same time, in the case where the workload requirement of the power adjustment module is reduced, the design and manufacturing cost of the power adjustment module can also be reduced.

[0064] Based on Figure 10 Based on the same technical concept, the present application further provides another display device, for example, Figure 11 For another embodiment of the display device provided by the present application, the structure schematic diagram is as follows: Figure 11 The display device shown in the display device as Figure 5The display device shown further comprises an output detection module, wherein a first end of the output detection module is connected to an output end of the voltage adjustment module (low-voltage buck / boost), and a second end of the output detection module is connected to the LLC module in the power supply circuit, and the output detection module can be used to send a feedback signal FB3 to the LLC module according to a power parameter output by the voltage adjustment module. At this time, the power parameter can be a voltage, and for the LLC module, when it is determined according to the feedback signal FB3 that the voltage output by the voltage adjustment module is greater than a preset value, the LLC module can control the first power supply branch to increase the first voltage output by the first power supply branch in a manner so as to increase the second voltage output by the second winding; and when it is determined according to the feedback signal FB3 that the voltage output by the voltage adjustment module is less than the preset value, the LLC module can control the first power supply branch to reduce the first voltage output by the first power supply branch in a manner so as to reduce the second voltage output by the second winding, thereby keeping the output voltage of the voltage adjustment module within a more reasonable preset voltage range and reducing the working load of the voltage adjustment module.

[0065] The application further provides a control method of a display device, which can be applied to the display device shown in the application. Figure 6 The control method of the display device is implemented in the form of software by the power adjustment module 17. Figure 12 A flowchart of an embodiment of the control method of the display device provided by the application is shown in the figure, and the control method comprises the following steps: S101: acquiring a second voltage of an LED light bar; S102: when the second voltage is greater than a first preset threshold, controlling the second power supply branch to output energy to the first power supply branch; and S103: when the second voltage is less than a second preset threshold, controlling the first power supply branch to output energy to the second power supply branch. The specific implementation manner and principle of the above method can be referred to the figure, and will not be described herein again. Figure 6

[0066] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction-related hardware. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the foregoing storage medium includes ROM, RAM, a magnetic disc or an optical disc and various program code storage media.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, rather than limit the same; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.​

Claims

1. A display device, characterized by comprising: The display device comprises: a circuit board; a display screen configured to display a picture; an LED light bar configured to light up the display screen; a power supply circuit configured to supply power to a load on the circuit board and the LED light bar; the power supply circuit comprises: a first power supply branch configured to output a first voltage to the circuit board; a second power supply branch configured to output a second voltage to the LED light bar; a power adjustment module having a first end connected to the first power supply branch and a second end connected to the second power supply branch; the power adjustment module is configured to control the second power supply branch to output energy to the first power supply branch when the second voltage is greater than a first preset threshold, and control the first power supply branch to output energy to the second power supply branch when the second voltage is less than a second preset threshold. The power adjustment module comprises:

2. The display device according to claim 1, wherein a step-down branch configured to output from the first end after step-down processing of the voltage at the second end; a step-up branch configured to output from the second end after step-up processing of the voltage at the first end. The power adjustment module further comprises:

3. The display device according to claim 2, wherein a controller configured to control the step-down branch or the step-up branch to be in an operating state according to the second voltage. The power adjustment module specifically comprises:

4. The display device according to claim 3, wherein a first switch, a second switch, a capacitor and an inductor, which constitute the step-up branch or the step-down branch; wherein a first end of the inductor is connected to the first power supply branch, a second end of the inductor is connected to a first end of the first switch and a first end of the second switch, a second end of the first switch is connected to a first end of the capacitor and the second power supply branch, a second end of the second switch is grounded, a second end of the capacitor is grounded, and the controller is connected to a control end of the first switch and a control end of the second switch. The power adjustment module specifically comprises:

5. The display device according to claim 3, wherein a controller, a third switch, a fourth switch and a transformer, which constitute the step-up branch or the step-down branch; wherein a first end of a primary side of the transformer is connected to the first power supply branch, a first end of a secondary side of the transformer is connected to the second power supply branch, a second end of the primary side of the transformer is connected to a first end of the third switch, a second end of the secondary side of the transformer is connected to a first end of the fourth switch, second ends of the third switch and the fourth switch are grounded, and the controller is connected to a control end of the third switch and a control end of the fourth switch. Further comprising:

6. The display device according to any one of claims 1 to 5, wherein an output detection module having a first end connected to the power adjustment module and a second end connected to a voltage conversion module in the power supply circuit; the output detection module is configured to acquire a power parameter output from the first end or the second end of the power adjustment module, and send a feedback signal to the voltage conversion module according to the power parameter.

7. The display device according to claim 6, wherein the voltage conversion module is configured to adjust the first voltage output by the first power supply branch when the power parameter does not meet a preset condition. ​

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