Display device

Abstract

The application provides a display device, which can simplify a power supply circuit of a backlight module and improve power supply efficiency of the display device. The display device comprises a display panel, a backlight module located at an incident light side of the display panel, a first light emitting element group and a second light emitting element group, wherein the power supply voltage of the first light emitting element group is not equal to that of the second light emitting element group, a backlight driving circuit comprising a transformer group, a primary winding, a first secondary winding and a second secondary winding, wherein a positive output end of the first secondary winding is electrically connected to the first light emitting element group, and a positive output end of the second secondary winding is electrically connected to the second light emitting element group, and at least one voltage conversion circuit, wherein the voltage conversion circuit and the second secondary winding are connected in series between a ground end and the second light emitting element group, and the voltage conversion circuit is used for voltage conversion on an input voltage.

Description

Technical Field

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

[0002] With the advancement and development of display technology, the requirements for power supply efficiency in display devices have increased. Since different colored light-emitting elements within the backlight module require different power supply voltages, it is necessary to provide separate power supplies for each color of light-emitting element.

[0003] However, for display devices using related technologies, to achieve independent power supply for different color light-emitting elements, multiple power supply circuits capable of outputting different power supply voltages are typically used, or a voltage converter is connected between the output of a single power supply voltage and the light-emitting element to adjust the input voltage of different light-emitting elements. This increases the complexity of the backlight module's power supply architecture, leading to energy losses during voltage conversion, affecting the power supply efficiency of the display device, and further increasing the manufacturing and operating costs of the display device. Summary of the Invention

[0004] Based on this, the display device provided in this application embodiment can simplify the power supply circuit of the backlight module, reduce energy loss during the light emission process of the display device, improve the power supply efficiency of the display device, and save the manufacturing and usage costs of the display device.

[0005] A first aspect of this application provides a display device, comprising:

[0006] The display panel includes a light-emitting side and a light-receiving side;

[0007] A backlight module is located on the light-incident side of the display panel. The backlight module includes at least a first light-emitting element group and a second light-emitting element group, wherein the first light-emitting element group includes a first light-emitting element, the second light-emitting element group includes a second light-emitting element, and the power supply voltage of the first light-emitting element group is not equal to the power supply voltage of the second light-emitting element group.

[0008] Backlight driving circuit, the backlight driving circuit includes:

[0009] A transformer bank includes a primary winding and at least two secondary windings. The at least two secondary windings include a first secondary winding and a second secondary winding. The positive output terminal of the first secondary winding is electrically connected to the first light-emitting element group, and the positive output terminal of the second secondary winding is electrically connected to the second light-emitting element group.

[0010] At least one voltage conversion circuit, wherein the voltage conversion circuit and the second secondary winding are connected in series between the ground terminal and the second light-emitting element group, and the voltage conversion circuit is used to convert the input voltage;

[0011] The first secondary winding is used to provide the power supply voltage for the first light-emitting element group, and the second secondary winding and the voltage conversion circuit connected in phase are used to jointly provide the power supply voltage for the second light-emitting element group.

[0012] The above technical solution has the following advantages or effects: By setting a transformer group including a first secondary winding and a second secondary winding, and electrically connecting the positive output terminal of the first secondary winding to the input terminal of the first light-emitting element group, the first secondary winding of the transformer group can directly supply power to the first light-emitting element group. Simultaneously, by connecting a voltage conversion circuit to the negative output terminal of the second secondary winding of the transformer group, the voltage conversion circuit can use the voltage output from the positive output terminal of the first secondary winding as the basis for feedback adjustment. Through voltage conversion of the external power supply voltage, the voltage conversion circuit can compensate for the voltage output of the second secondary winding to meet the power supply voltage requirements of the second light-emitting element group. Therefore, different input voltages can be provided to the first light-emitting element group and at least one second light-emitting element group with different required power supply voltages. Furthermore, feedback adjustment of the voltage conversion circuit can be formed based on the voltage output from the positive output terminal of the first secondary winding, thereby enabling stepped power supply to the first light-emitting element group and at least one second light-emitting element through the backlight driving circuit. It can simplify the power supply circuit of the backlight module, and the voltage conversion circuit is independent of the second secondary winding, which can reduce the efficiency loss of power during the conversion process, reduce the manufacturing cost and usage cost of the display device, and improve the voltage regulation efficiency by using the voltage conversion circuit to power the device, further improving the sensitivity of the backlight driving circuit, thereby improving the luminous effect of different light-emitting element groups in the backlight module, and improving the display effect and display quality of the display device.

[0013] In some embodiments, the voltage conversion circuit includes a voltage input terminal connected to the positive output terminal of the first secondary winding.

[0014] The above technical solution has the following advantages or effects: By electrically connecting the voltage input terminal of the voltage conversion circuit to the positive output terminal of the first secondary winding, the voltage conversion circuit can easily obtain real-time feedback from the positive output terminal of the first secondary winding, so as to adjust the voltage conversion mechanism according to the voltage change of the positive output terminal of the first secondary winding. Furthermore, the voltage output by the voltage conversion circuit can be matched with the voltage output by the positive output terminal of the second secondary winding, accelerating the adjustment frequency of the voltage conversion circuit, further improving the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group, and improving the accuracy of the output voltage of the backlight driving circuit, thereby improving the display effect and display quality of the display device. In some embodiments, the number of voltage conversion circuits in the backlight driving circuit is equal to the number of the second secondary windings, the second secondary windings correspond to the voltage conversion circuits, and the backlight module includes at least two second light-emitting element groups with different supply voltages.

[0015] The positive output terminal of each of the second secondary windings is electrically connected to a second light-emitting element group, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit.

[0016] The above technical solution has the following advantages or effects: by setting the second secondary winding in a corresponding manner with the voltage conversion circuit, the adjustment accuracy of the input voltage of the second light-emitting element group can be further improved, the voltage regulation capability of the backlight driving circuit can be improved, thereby improving the sensitivity of the display device and improving the display effect and display quality of the display device.

[0017] In some embodiments, the supply voltage of the first light-emitting element group is lower than the supply voltage of the second light-emitting element group.

[0018] The above technical solution has the following advantages or effects: by using the light-emitting element group with the lowest supply voltage as the first light-emitting element group directly electrically connected to the positive output terminal of the first secondary winding, the input voltage of the first light-emitting element group can be prevented from being too high, thereby improving the safety and reliability of the backlight driving circuit.

[0019] In some embodiments, a second secondary winding and a voltage conversion circuit are used together to provide power supply voltage for at least two of the second light-emitting element groups.

[0020] The above technical solution has the following advantages or effects: By using a second secondary winding and a voltage conversion circuit to power at least two second light-emitting element groups, multiple second light-emitting element groups can share a second secondary winding and a voltage conversion circuit to coarsely adjust the voltage input to the input terminal of the second light-emitting element group. This can further simplify the circuit architecture of the backlight driving circuit, reduce the complexity of the backlight driving circuit, reduce the control difficulty of the voltage conversion circuit, and improve the voltage regulation efficiency, thereby reducing the manufacturing cost and usage cost of the display device.

[0021] In some embodiments, the backlight driving circuit includes one of the voltage conversion circuits, the transformer group includes at least two second secondary windings, and the backlight module includes at least two second light-emitting element groups with different supply voltages;

[0022] Among them, the positive output terminal of one of the second secondary windings is electrically connected to the second light-emitting element group whose power supply voltage is the first power supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit.

[0023] The positive output terminal of the other second secondary winding is electrically connected to another second light-emitting element group with a supply voltage of the second supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit;

[0024] The number of turns of the coil in the second secondary winding of the second light-emitting element group, which is electrically connected to different power supply voltages, is not equal.

[0025] The above technical solution has the following advantages or effects: By setting a voltage conversion circuit and at least two second secondary windings, multiple second light-emitting element groups with different supply voltages can share a single voltage conversion circuit, thereby simplifying the circuit architecture of the backlight driving circuit. Furthermore, by adjusting the number of turns in the second secondary windings, different voltages can be output from the positive output terminals of different second secondary windings. This allows for adjustment of the input voltages to different second light-emitting element groups under the compensation effect of the voltage conversion circuit. Individual power supply to second light-emitting element groups with different supply voltages can be achieved, further improving the backlight driving circuit's control over the output voltage, increasing the accuracy of power supply to the light-emitting element groups, reducing energy loss during energy conversion, improving the energy transmission efficiency of the display device, enhancing the display effect and quality, and saving on the manufacturing and operating costs of the display device.

[0026] In some embodiments, the transformer includes at least two first secondary windings, wherein the positive output terminal of each first secondary winding is electrically connected to the first light-emitting element group;

[0027] The positive output terminals of each of the first secondary windings are used to jointly provide the power supply current for the first light-emitting element group.

[0028] The above technical solution has the following advantages or effects: By setting at least two first secondary side windings to power the same first light-emitting element group, the voltage or current on each first secondary side winding can be reduced, further reducing the heat generated during power transmission. Simultaneously, the area occupied by the positive output terminal of the first secondary side winding can be increased, increasing the heat dissipation space of the first secondary side winding, further improving the heat dissipation effect of the backlight driving circuit and preventing color shift in the light emitted from the first and second light-emitting element groups in the backlight module due to excessive temperature. This improves the control precision and capability of the backlight driving circuit for the light-emitting element group, and enhances the display effect and quality of the display device. By having at least two first secondary side windings jointly provide current to the first light-emitting element group, the current on each first secondary side winding can be reduced, further reducing the heat dissipated by the backlight driving circuit. Simultaneously, the area occupied by the positive output terminal of the first secondary side winding can be increased, increasing the heat dissipation space of the first secondary side winding, further improving the heat dissipation effect of the backlight driving circuit and preventing color shift in the light emitted from the first and second light-emitting element groups in the backlight module due to excessive temperature. This can improve the control precision and control capability of the backlight driving circuit over the light-emitting element group, thereby improving the display effect and display quality of the display device.

[0029] In some embodiments, the transformer bank includes two primary windings and two second secondary windings;

[0030] In this configuration, one primary winding corresponds to one first secondary winding and a portion of the second secondary winding, and another primary winding corresponds to another first secondary winding and the remaining portion of the second secondary winding.

[0031] The above technical solution has the following advantages or effects: By setting the transformer group to include two primary windings and two secondary windings, the voltage and current input to the primary windings corresponding to different secondary windings can be set. This allows for coarse adjustment of the output of the secondary windings of the transformer group by adjusting the input of the transformer. This further reduces the control difficulty of the voltage conversion circuit, improves the voltage regulation efficiency, improves the accuracy of power supply to the light-emitting element group, reduces the power loss generated by energy conversion, improves the energy transmission efficiency of the display device, and improves the display effect and display quality of the display device.

[0032] In some embodiments, at least two of the primary windings are connected in series;

[0033] The positive output terminal of the second secondary winding corresponding to a different primary winding is electrically connected to the second light-emitting element group with a different supply voltage.

[0034] The above technical solution has the following advantages or effects: When a transformer group includes two primary windings and two first secondary windings, by connecting at least two primary windings in series, the primary windings of different transformer groups can share a portion of the front-end control circuit. This further simplifies the circuit architecture of the backlight driving circuit, reduces the control difficulty of the backlight driving circuit, reduces energy loss during energy conversion, improves the energy transmission efficiency of the display device, and reduces the manufacturing cost of the display device. By electrically connecting the positive output terminals of the second secondary windings corresponding to different primary windings to second light-emitting element groups with different supply voltages, the control capability of the primary windings of the transformer group on the input voltage of the second light-emitting element group can be further enhanced, narrowing the adjustment range of the voltage conversion circuit and thus reducing the control difficulty of the voltage conversion circuit. This improves the voltage regulation efficiency of the backlight driving circuit, reduces energy loss during energy conversion, and further improves the energy transmission efficiency of the display device.

[0035] In some implementations, the number of the first secondary windings is positively correlated with the supply current of the first light-emitting element group.

[0036] The above technical solution has the following advantages or effects: By setting the number of secondary side windings to be positively correlated with the supply current of the first light-emitting element group, the number of primary side windings can be increased when the supply current of the first light-emitting element group is large, thereby improving the heat dissipation efficiency of the backlight driving circuit and enhancing the reliability and stability of the display device. When the supply current of the first light-emitting element group is small, increasing the number of primary side windings can further reduce the manufacturing cost of the backlight driving circuit, simplify its circuit architecture, reduce the control difficulty, decrease energy loss during energy conversion, and improve the energy transmission efficiency of the display device.

[0037] In some embodiments, the display device further includes:

[0038] A first feedback unit, wherein the input terminal of the first feedback unit is used to acquire a first control signal from the first light-emitting element group, and the output terminal of the first feedback unit is electrically connected to the input terminal of the primary winding of the transformer, the first feedback unit being used to provide a first feedback signal according to the first control signal, the first feedback signal being used to adjust the voltage of the primary winding of the transformer; and / or,

[0039] The second feedback unit has an input terminal for acquiring a second control signal from the second light-emitting element group, and an output terminal for being electrically connected to the voltage conversion circuit. The second feedback unit is used to generate a second feedback signal based on the second control signal, and the voltage conversion circuit is used to adjust the voltage output by the voltage conversion circuit based on the second feedback signal.

[0040] The above technical solution has the following advantages or effects: By acquiring the first control signal from the control terminal of the first light-emitting element group through the input terminal of the first feedback unit, the current light-emitting state of the first light-emitting element group can be determined based on the first control signal. Furthermore, the difference between the current light-emitting state and the target light-emitting state of the first light-emitting element group can be determined, and a first feedback signal is generated based on this difference. This allows the secondary winding of the transformer to output a corresponding voltage based on the first feedback signal, enabling the light-emitting state of the first light-emitting element group to reach the target light-emitting state. This allows for adjustment of the voltage input to the input terminal of the first light-emitting element group, improving the accuracy and effect of the light emission. Simultaneously, it allows for coarse adjustment of the voltage input to the input terminal of the second light-emitting element group, reducing the adjustment range and difficulty of the voltage conversion circuit. Furthermore, it improves the accuracy of the output voltage of the backlight driving circuit and enhances the display effect of the display device. The second control signal of the control terminal of the second light-emitting element group is obtained through the input terminal of the second feedback unit. Based on the second control signal, the current light-emitting state of the second light-emitting element group can be determined. Furthermore, the difference between the current light-emitting state and the target light-emitting state can be determined, and a second feedback signal is generated based on this difference. This allows the voltage conversion circuit to perform voltage conversion based on the voltage fluctuations of the transformer's secondary winding, ensuring that the voltage output from the positive output terminal of the second secondary winding and the voltage output from the voltage conversion circuit meet the power supply voltage requirements of the second light-emitting element group. This accelerates the adjustment frequency of the voltage conversion circuit, further improving the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group and the accuracy of the output voltage of the backlight drive circuit, thereby improving the display effect and display quality of the display device.

[0041] In some embodiments, the first light-emitting element in the first light-emitting element group emits red light, and the first light-emitting element in the second light-emitting element group emits green light and blue light.

[0042] The above technical solution has the following advantages or effects: By setting the emission color of the first light-emitting element group to red, the primary winding of the transformer group can preferentially adjust the voltage output at the positive output terminal of the first secondary winding according to the required power supply voltage of the first light-emitting element group, thereby meeting the power supply requirements of the red-emitting element group. Furthermore, by setting the emission color of the second light-emitting element group to at least one of green and blue, the primary winding of the transformer group can be used to coarsely adjust the voltage input to the input terminal of the second light-emitting element group, and then a voltage conversion circuit can be used for high-frequency fine adjustment to meet the power supply requirements of the light-emitting element group with at least one of green and blue emission colors. In addition, by simplifying the power transmission path of the red-emitting element group, the heat generated by current transmission can be further reduced, the color temperature of light-emitting element groups with different emission colors within the backlight module can be further balanced, and the display effect and display quality of the display device can be improved. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic structural diagram of a display device provided in an embodiment of this application;

[0045] Figure 2 A schematic cross-sectional view of a display device provided in an embodiment of this application;

[0046] Figure 3 A schematic structural diagram of another display device provided in the embodiments of this application;

[0047] Figure 4 A schematic structural diagram of another display device provided in the embodiments of this application;

[0048] Figure 5 A schematic structural diagram of another display device provided in the embodiments of this application;

[0049] Figure 6 A schematic structural diagram of a display device provided in an embodiment of this application;

[0050] Figure 7 A schematic structural diagram of a transformer group for a display device provided in an embodiment of this application;

[0051] Figure 8A schematic structural diagram of a backlight driving circuit for a display device provided in an embodiment of this application;

[0052] Figure 9 A schematic structural diagram of another display device provided in the embodiments of this application;

[0053] Figure 10 A schematic structural diagram of another display device provided in the embodiments of this application;

[0054] Figure 11 A schematic structural diagram of another display device provided in the embodiments of this application;

[0055] Figure 12 This is a schematic overall architecture diagram of a display device provided in an embodiment of this application.

[0056] Explanation of reference numerals in the attached figures:

[0057] 100, Display panel; 200, Backlight module; 210, First light-emitting element group; 220, Second light-emitting element group; 300, Backlight driving circuit; 310, Primary winding; 320, Secondary winding; 321, First secondary winding; 322, Secondary winding; 330, Voltage conversion circuit; 400, First feedback unit; 500, Second feedback unit. Detailed Implementation

[0058] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0059] Unless otherwise defined, 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0060] It should be understood that when an element or layer is referred to as "on," "adjacent to," "electrically connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, electrically connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly electrically connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, parts, regions, layers, doping types, and / or portions, these elements, parts, regions, layers, doping types, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, part, region, layer, doping type, or portion from another element, part, region, layer, doping type, or portion. Therefore, without departing from the teachings of this invention, the first element, component, region, layer, doping type, or portion discussed below may be represented as a second element, component, region, layer, or portion; for example, the first doping type may be referred to as the second doping type, and similarly, the second doping type may be referred to as the first doping type; the first doping type and the second doping type are different doping types, for example, the first doping type may be P-type and the second doping type may be N-type, or the first doping type may be N-type and the second doping type may be P-type.

[0061] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0062] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, in this specification, the term “and / or” includes any and all combinations of the associated listed items.

[0063] With the advancement and development of display technology, the requirements for power supply efficiency in display devices have increased. Since different colored light-emitting elements in the backlight module require different power supply voltages, it is necessary to design multiple power supply circuits to provide individual power to the different colored light-emitting elements.

[0064] It should be noted that in display devices using related technologies, multiple LLC half-bridge resonant circuits are typically used as the power supply circuit for the backlight module. By controlling the switching frequency of the switching transistors within the LLC half-bridge resonant circuits, each LLC half-bridge resonant circuit can output a different power supply voltage to meet the power requirements of different light-emitting elements. The LLC architecture in these technologies typically includes two MOSFETs, a controller, and a transformer, outputting three different voltages through three LLC circuits. However, the aforementioned power supply circuit architecture is highly complex, uses many electronic components, and occupies a large power board area, leading to increased manufacturing costs and control difficulties. For example, with a total input power of 300W, under ideal operating conditions, each LLC half-bridge resonant circuit outputs 100W. However, in actual operation, some power loss occurs, resulting in a total output power of only 285W, a power loss of 15W, and a power efficiency of 95%.

[0065] In related technology devices, multiple voltage converters are typically installed at the output of one LLC half-bridge resonant circuit to convert the voltage output by the LLC half-bridge resonant circuit, so that the converted voltage can meet the power requirements of different light-emitting elements. However, the power efficiency of the LLC half-bridge resonant circuit in the above power supply circuit is usually around 95% during the power output process, and the power efficiency of the voltage converters in the above power supply circuit is also usually around 95%. Therefore, during the power transfer process, the power architecture of one LLC half-bridge resonant circuit plus three voltage converters will cause power loss in the output of the LLC half-bridge resonant circuit, resulting in further reduction of power efficiency, with the reduced power efficiency being 90.25%. Taking a total input power of 300W as an example, under ideal operating conditions, each output terminal is set to output 100W. However, in actual operation, there will be some power loss. The actual output power of each output terminal is 100×95%×95%=90.25W, so the actual output power of each output terminal is 90.25W. The actual total output power of the power supply architecture is 90.25×3=270.75W, so the actual total output power of the power supply architecture is 270.75W, resulting in a power loss of 29.25W. The power efficiency is 270.75 / 300=90.25%, so the actual efficiency of the power supply architecture is 90.25%.

[0066] Therefore, proposing a backlight driving circuit that is simple in design and has high energy transmission efficiency is a technical problem that urgently needs to be solved.

[0067] like Figure 1 and Figure 2 As shown, in a first aspect of this application, a display device is provided, including a display panel 100. The display panel 100 includes a light-emitting side and a light-receiving side.

[0068] In some feasible embodiments, the display device includes a backlight module 200; wherein the backlight module 200 is located on the light-incident side of the display panel 100, and the backlight module 200 includes at least a first light-emitting element group 210 and a second light-emitting element group 220, wherein the first light-emitting element group 210 includes a first light-emitting element, the second light-emitting element group 220 includes a second light-emitting element, and the power supply voltage of the first light-emitting element group 210 is not equal to the power supply voltage of the second light-emitting element group 220.

[0069] For example, the wavelengths of the light emitted by the first light-emitting element group 210 and the second light-emitting element group 220 may be different. Specifically, the colors of the light emitted by the first light-emitting element group 210 and the second light-emitting element group 220 may be different. The colors of the light emitted by the first light-emitting element group 210 and the second light-emitting element group 220 may be any two of red, green and blue.

[0070] In some feasible embodiments, the display device includes a backlight driving circuit 300; wherein the backlight driving circuit 300 includes: a transformer group including a primary winding 310 and at least two secondary windings 320, the secondary windings 320 including a first secondary winding 321 and a second secondary winding 322, the positive output terminal of the first secondary winding 321 being electrically connected to a first light-emitting element group 210, and the positive output terminal of the second secondary winding 322 being electrically connected to a second light-emitting element group 220; at least one voltage conversion circuit 330, the voltage conversion circuit 330 and the second secondary winding 322 being connected in series between a ground terminal and the second light-emitting element group 220, the voltage conversion circuit 330 being used to perform voltage conversion on the input voltage.

[0071] For example, the backlight module 200 and the backlight driving circuit 300 can be disposed on the same layer on the circuit board.

[0072] For example, the positive output terminal of the first secondary winding 321 is used to output a DC voltage with a first voltage value, which is equal to the supply voltage of the first light-emitting element group 210. The negative output terminal of the first secondary winding 321 is used for grounding. It should be noted that the supply voltage of the first light-emitting element group 210 is a floating voltage. The voltage value output from the positive output terminal of the first secondary winding 321 is adjusted according to the floating voltage required by the first light-emitting element group 210, so that the voltage output from the positive output terminal of the first secondary winding 321 can be directly used to supply power to the first light-emitting element group 210. The connection method of the primary winding 310 of the transformer group can be the same as the connection method of the primary coil of the transformer group in an LLC half-bridge resonant circuit.

[0073] For example, the first light-emitting element group 210 can be the light-emitting element group with the lowest required supply voltage in the backlight module 200. Using the supply voltage required by the first light-emitting element group 210 as the reference voltage for adjusting the primary winding 310 can improve the accuracy of the voltage value input to the input terminal of the first light-emitting element group 210, improve the display effect of the first light-emitting element group 210, and prevent the first light-emitting element group 210 from burning out due to excessive voltage. Furthermore, the voltage output of the voltage conversion circuit 330 can be adjusted according to the voltage value output from the positive output terminal of the first secondary winding 321. Thus, different input voltages can be provided to the first light-emitting element group 210 and at least one second light-emitting element group 220 with different required supply voltages. At the same time, feedback adjustment can be formed on the voltage conversion circuit 330 based on the voltage output from the positive output terminal of the first secondary winding 321, thereby realizing the stepped power supply of the first light-emitting element group 210 and at least one second light-emitting element 220 through the backlight driving circuit 300.

[0074] It should be noted that the second secondary winding 322 is connected in series with the voltage conversion circuit 330 to jointly power the second light-emitting element group 220. This reduces the adjustment range of the voltage conversion circuit 330, improves the accuracy of voltage regulation, and further enhances the display effect of the backlight module. Simultaneously, the voltage conversion circuit 330 can be formed using low-voltage electronic components, reducing the cost of the backlight driving circuit 300 and improving its reliability. For example, when the supply voltage of the second light-emitting element group 220 is 10V, the voltage output directly from the positive output terminal of the second secondary winding 322 to the second light-emitting element group 220 is 5V, and the voltage conversion circuit 330 also directly outputs 5V to the second light-emitting element group 220. Therefore, compared to display devices that use only the voltage conversion circuit 330 for voltage regulation, the adjustment range of the voltage conversion circuit 330 in the display device provided in this application embodiment is relatively small.

[0075] For example, the positive output terminal of the first secondary winding 321 can be directly electrically connected to the input terminal of the first light-emitting element group 210, or a rectifier can be connected between the positive output terminal of the first secondary winding 321 and the input terminal of the first light-emitting element group 210. The positive output terminal of the second secondary winding 322 can be directly electrically connected to the input terminal of the second light-emitting element group 220, or a rectifier can be connected between the positive output terminal of the second secondary winding 322 and the input terminal of the second light-emitting element group 220.

[0076] For example, the voltage conversion circuit 330 may include a DC-DC converter. The input terminal of the voltage conversion circuit 330 can be connected to an external power supply voltage to convert the DC power input from the external power supply into DC power with a target voltage value. Alternatively, the input terminal of the voltage conversion circuit 330 can be connected to the positive output terminal of the first secondary winding 321 to convert the voltage output from the first secondary winding 321 into DC power with a target voltage value. The output terminal of the voltage conversion circuit 330 is used to output DC power with a target voltage value, and the positive output terminal of the second secondary winding 322 is used to output DC power with a second voltage value. The sum of the target voltage and the second voltage is equal to the supply voltage of the second light-emitting element group 220.

[0077] For example, the backlight driving circuit 300 may further include a controller, the input terminal of which is electrically connected to the positive output terminal of the first secondary winding 321, and the output terminal of which is electrically connected to the input terminal of the voltage conversion circuit 330. The controller is used to determine the fluctuation amplitude of the voltage output from the positive output terminal of the second secondary winding 322 based on the fluctuation of the voltage signal at the positive output terminal of the first secondary winding 321, thereby determining the required output voltage for the voltage conversion circuit 330. Furthermore, the controller generates a control signal for the voltage conversion circuit 330 based on the required output voltage, so that the voltage conversion circuit 330 can adjust the magnitude of its output voltage according to the control signal. This ensures that the voltage output from the positive output terminal of the second secondary winding 322 and the voltage output from the voltage conversion circuit 330 together meet the power supply voltage required by the second light-emitting element group 220. This allows for high-frequency adjustment of the voltage conversion of the voltage conversion circuit 330, further improving the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group 220.

[0078] The first secondary winding 321 is used to provide the power supply voltage for the first light-emitting element group 210, and the second secondary winding 322 and the voltage conversion circuit 330 connected in phase are used to jointly provide the power supply voltage for the second light-emitting element group 220.

[0079] For example, in the case where the transformer group includes a first secondary winding 321 and two second secondary windings 322, and the backlight driving circuit 300 includes two voltage conversion circuits 330, assuming that under ideal conditions, the total output power of the secondary windings in the backlight driving circuit 300 is 300W, wherein the first secondary winding 321 outputs 100W of power to the first light-emitting element group 210 under ideal conditions, due to energy loss, 100×95%=95, the actual output power of the first secondary winding 321 and the second secondary winding 322 is 95W, therefore the actual input power at the input terminal of the first light-emitting element group 210 is only 95W.

[0080] For example, the first secondary winding 321 is responsible for the power adjustment required by the second light-emitting element group 220. Ideally, for each of the two second light-emitting element groups 220, the first secondary winding 321 also needs to handle 25W of power adjustment. Therefore, 50W of electrical energy needs to undergo two power losses through the transformer group and the voltage conversion circuit 330, 50 × 95% × 95% = 45.125W. Thus, the actual power output by the two voltage conversion circuits 330 is 45.125W. Simultaneously, the electrical energy directly obtained from the second secondary winding 322 at the input of the second light-emitting element group 220 undergoes one power loss through the transformer group, 75 × 95% = 71.25W. Therefore, the actual power output by the two second secondary windings 322 is 71.25W. Therefore, in the display device provided in this application embodiment, 71.25×2+95=282.625, the total power actually output by each output terminal of the backlight driving circuit 300 is 282.625W, and further, 282.625 / 300=94.2%, the power efficiency actually output by each output terminal of the backlight driving circuit 300 is 94.2%.

[0081] It is understandable that, compared to display devices in related technologies that use three LLC half-bridge resonant circuits as the power supply circuit for the backlight module, the power supply architecture of the display device provided in this application embodiment is simpler, requires a smaller power board area, and reduces the manufacturing cost of the display device. Compared to display devices in related technologies that use one LLC half-bridge resonant circuit connected in series with three voltage converters as the power supply circuit for the backlight module, the display device provided in this application embodiment allows the second secondary winding 322 to be relatively independent from the voltage conversion circuit 330, which can reduce the power loss of the backlight driving circuit 300 during power supply and reduce the usage cost of the display device. At the same time, by adjusting the output voltage according to the actual voltage output by the first secondary winding 321, the voltage adjustment efficiency and accuracy can be further improved, thereby improving the sensitivity of the backlight driving circuit 300, improving the luminous effect of different light-emitting element groups in the backlight module, and improving the display effect and display quality of the display device.

[0082] The display device provided in this application embodiment, by setting a transformer group including a first secondary winding 321 and a second secondary winding 322, and electrically connecting the positive output terminal of the first secondary winding 321 to the input terminal of the first light-emitting element group 210, allows the first secondary winding 321 of the transformer group to directly supply power to the first light-emitting element group 210. Simultaneously, by connecting a voltage conversion circuit 330 to the negative output terminal of the second secondary winding 322 of the transformer group, the voltage conversion circuit 330 can use the voltage output from the positive output terminal of the first secondary winding 321 as the basis for feedback adjustment. Through voltage conversion, the voltage conversion circuit 330 can compensate for the voltage output from the second secondary winding 332, thereby meeting the power supply voltage requirements of the second light-emitting element group 220. This allows for the provision of different input voltages to the first light-emitting element group 210 and at least one second light-emitting element group 220, which require different supply voltages. Simultaneously, feedback regulation can be established for the voltage conversion circuit 330 based on the voltage output from the positive output terminal of the first secondary winding 321. Furthermore, the backlight driving circuit 300 can achieve stepped power supply to the first light-emitting element group 210 and at least one second light-emitting element 220. This simplifies the power supply circuit of the backlight module 200. Moreover, the voltage conversion circuit 330 is independent of the second secondary winding 322, reducing energy loss during conversion and lowering the manufacturing and operating costs of the display device. Using the voltage conversion circuit 330 also improves voltage regulation efficiency, further enhancing the sensitivity of the backlight driving circuit 300. Ultimately, this improves the luminous effect of different light-emitting element groups in the backlight module 200, thereby enhancing the display effect and quality of the display device.

[0083] like Figure 1As shown, the voltage conversion circuit 330 includes a voltage input terminal, which is connected to the positive output terminal of the first secondary winding 321.

[0084] It should be noted that in related display devices, the reference input terminal of the voltage conversion circuit 330 is typically connected to the display device's motherboard to obtain the 12V motherboard voltage as a reference voltage. However, the motherboard voltage of the display device is significantly affected by temperature, easily causing noticeable temperature drift, which leads to fluctuations in the voltage input terminal of the voltage conversion circuit 330. In related display devices, a motherboard voltage feedback mechanism is typically lacking. Therefore, without obtaining real-time feedback from the motherboard voltage, the voltage conversion circuit 330 performs voltage conversion based on a fixed 12V voltage, resulting in a voltage difference between the actual output voltage and the expected output voltage. This affects the accuracy of power supply to the second light-emitting element group 220, thus impacting the display effect of the display device.

[0085] The display device provided in this application embodiment, by electrically connecting the voltage input terminal of the voltage conversion circuit 330 to the positive output terminal of the first secondary winding 321, facilitates the voltage conversion circuit 330 to obtain real-time feedback from the positive output terminal of the first secondary winding 321. This allows the voltage conversion mechanism to be adjusted according to the voltage changes at the positive output terminal of the first secondary winding 321. Furthermore, it enables the voltage output by the voltage conversion circuit 330 to match the voltage output by the positive output terminal of the second secondary winding 322, accelerating the adjustment frequency of the voltage conversion circuit 330. This further improves the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group 220, and enhances the accuracy of the output voltage of the backlight driving circuit 300, thereby improving the display effect and display quality of the display device.

[0086] like Figure 1 As shown, in some feasible embodiments, the number of voltage conversion circuits 330 in the backlight driving circuit 300 is equal to the number of second secondary windings 322, the second secondary windings 322 correspond to the voltage conversion circuits 330, and the backlight module 200 includes at least two second light-emitting element groups 220 with different supply voltages.

[0087] For example, the number of second light-emitting element groups 220 with different supply voltages is equal to the number of voltage conversion circuits 330 within the backlight driving circuit 300. Alternatively, the number of second light-emitting element groups 220 with different supply voltages is greater than the number of voltage conversion circuits 330 within the backlight driving circuit 300.

[0088] The positive output terminal of each second secondary winding 322 is electrically connected to a second light-emitting element group 220, and the negative output terminal is electrically connected to the output terminal of a voltage conversion circuit 330.

[0089] The display device provided in this application embodiment can further improve the adjustment accuracy of the input voltage of the second light-emitting element group 220 and improve the voltage regulation capability of the backlight driving circuit 300 by making the second secondary winding 322 correspond to the voltage conversion circuit 330, thereby improving the sensitivity of the display device and improving the display effect and display quality of the display device.

[0090] In some feasible implementations, the supply voltage of the first light-emitting element group 210 is lower than the supply voltage of the second light-emitting element group 220.

[0091] It should be noted that the voltages at the positive output terminals of the first secondary winding 321 and the second secondary winding 322, which correspond to the same primary winding 310, will change synchronously.

[0092] The display device provided in this application embodiment, by using the light-emitting element group with the lowest supply voltage as the first light-emitting element group 210 directly electrically connected to the positive output terminal of the first secondary winding 321, can prevent the voltage input to the input terminal of the first light-emitting element group 210 from being too high, thereby improving the safety and reliability of the backlight driving circuit 300.

[0093] like Figure 3 As shown, in some feasible implementations, a second secondary winding 322 and a voltage conversion circuit 330 are used together to provide the power supply voltage for at least two second light-emitting element groups 220.

[0094] For example, a second secondary winding 322 can be electrically connected to the input terminals of at least two second light-emitting element groups 220. Wherein, as Figure 3 As shown, a second secondary winding 322 may include a positive output terminal, a voltage conversion circuit 330 may be connected in series with the negative output terminal of the second secondary winding 322, and the positive output terminal of the second secondary winding 322 may be electrically connected to the input terminals of at least two second light-emitting element groups 220.

[0095] For example, a second secondary winding 322 may include at least two positive output terminals, and the voltage conversion circuit 330 may include at least two positive output terminals. One output terminal of the voltage conversion circuit 330 is connected between a positive output terminal of the second secondary winding 322 and an input terminal of a second light-emitting element group 220. The number of positive output terminals of the second secondary winding 322 may be equal to the number of second light-emitting element groups 220, and the number of positive output terminals of the second secondary winding 322 may be equal to the number of positive output terminals of the voltage conversion circuit 330.

[0096] For example, at least two second light-emitting element groups 220 connected to the same second secondary winding 322 and the same voltage conversion circuit 330 require similar supply voltages.

[0097] The display device provided in this application embodiment supplies power to at least two second light-emitting element groups 220 through a second secondary winding 322 and a voltage conversion circuit 330. This allows multiple second light-emitting element groups 220 to share a second secondary winding 322 and a voltage conversion circuit 330, enabling coarse adjustment of the voltage input to the input terminal of the second light-emitting element group 220. This further simplifies the circuit architecture of the backlight driving circuit 300, reduces the complexity of the backlight driving circuit 300, reduces the control difficulty of the voltage conversion circuit 330, and improves the voltage regulation efficiency, thereby reducing the manufacturing cost and usage cost of the display device.

[0098] For example, such as Figure 4 and Figure 5 As shown, in some feasible embodiments, a second secondary winding 322 and at least two voltage conversion circuits 330 are used to jointly provide the power supply voltage for at least two second light-emitting element groups 220. The second secondary winding 322 may include at least two positive output terminals, and the number of positive output terminals of the second secondary winding 322 may be equal to the number of voltage conversion circuits 330.

[0099] The display device provided in this application embodiment supplies power to at least two second light-emitting element groups 220 through a second secondary winding 322 and at least two voltage conversion circuits 330. This allows multiple second light-emitting element groups 220 to share a single second secondary winding 322. The second secondary winding 322 coarsely adjusts the voltage input to the input terminals of the second light-emitting element groups 220, and the voltage conversion circuits 330 further compensate and correct the voltage input to the input terminals of the second light-emitting element groups 220. This improves the accuracy of the voltage input to the input terminals of the second light-emitting element groups 220, enhances the display effect and quality of the display device, saves the second secondary winding 322, simplifies the circuit architecture of the backlight driving circuit 300, reduces the complexity of the backlight driving circuit 300, reduces the control difficulty of the voltage conversion circuit 330, and improves voltage regulation efficiency, thereby reducing the manufacturing and usage costs of the display device.

[0100] like Figure 6 As shown, in some feasible embodiments, the backlight driving circuit 300 includes a voltage conversion circuit 330, the transformer group includes at least two second secondary windings 322, and the backlight module 200 includes at least two second light-emitting element groups 220 with different supply voltages.

[0101] For example, the colors of the light emitted by the second light-emitting element group 220 with different power supply voltages can be different.

[0102] In this circuit, the positive output terminal of one second secondary winding 322 is electrically connected to the second light-emitting element group 220 with a supply voltage of the first supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit 330. The positive output terminal of the other second secondary winding 322 is electrically connected to another second light-emitting element group 220 with a supply voltage of the second supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit 330.

[0103] For example, the positive output terminals of at least two second secondary windings 322 output different voltages. One second secondary winding 322's positive output terminal outputs a DC voltage equal to a first sub-voltage, while the other second secondary winding 322's positive output terminal outputs a DC voltage equal to a second sub-voltage. The output terminal of the voltage conversion circuit 330 outputs a DC voltage equal to a target voltage. The first supply voltage is equal to the sum of the first sub-voltage and the target voltage, and the second supply voltage is equal to the sum of the second sub-voltage and the target voltage.

[0104] The display device provided in this application embodiment, by setting a voltage conversion circuit 330 and at least two second secondary windings 322, allows multiple second light-emitting element groups 220 with different supply voltages to share a single voltage conversion circuit 330, thereby simplifying the circuit architecture of the backlight driving circuit 300. Furthermore, by adjusting the number of coil turns of the second secondary windings 322, different voltages can be output from the positive output terminals of different second secondary windings 322. This allows for adjustment of the voltage input to the input terminals of different second light-emitting element groups 220 under the compensation effect of the voltage conversion circuit 330. Individual power supply to second light-emitting element groups 220 with different supply voltages can be achieved, further improving the backlight driving circuit 300's control over the output voltage, increasing the accuracy of power supply to the light-emitting element groups, reducing energy loss during energy conversion, improving the energy transmission efficiency of the display device, enhancing the display effect and quality, and saving on the manufacturing and usage costs of the display device.

[0105] For example, the number of turns of the coil of the second secondary winding 322 of the second light-emitting element group 220, which is electrically connected to a second light-emitting element group 220 with a different supply voltage, is not equal.

[0106] It should be noted that in the transformer group, the ratio of the number of turns in the primary winding 310 to the number of turns in the secondary winding 320 is related to the magnitude of the output voltage of the secondary winding 320.

[0107] The display device provided in this application embodiment, by setting the number of turns of the coil of the second secondary winding 322 of the second light-emitting element group 220, which is electrically connected to different power supply voltages, is not equal. This facilitates coarse adjustment of the voltage value input to the input terminal of the second light-emitting element group 220, reduces the adjustment range of the voltage conversion circuit 330, and avoids the voltage conversion circuit 330 from frequently performing large voltage adjustments, which would increase the risk of burnout. This improves the safety of the voltage conversion circuit 330, reduces the control difficulty of the voltage conversion circuit 330, and thus reduces the operating cost of the display device.

[0108] For example, at least two secondary windings 320 of the transformer bank have different numbers of turns.

[0109] For example, the number of turns of the first secondary winding 321 and the second secondary winding 322 of the transformer group can be different, and the number of turns of any two second secondary windings 322 of the transformer group can also be different.

[0110] For example, the number of turns of the first secondary winding 321 can be determined based on the number of turns of the primary winding 310 of the transformer group and the power supply voltage required by the first light-emitting element group 210.

[0111] The display device provided in this application embodiment, by setting the number of turns of at least two secondary windings 320 of the transformer group to be different, can easily make coarse adjustments to the voltage output at the positive output terminal of the secondary winding 320 by adjusting the ratio of the number of turns of the secondary winding 320 to the number of turns of the primary winding 310. This further reduces the adjustment difficulty of the backlight driving circuit 300 and lowers the cost of using the display device.

[0112] like Figure 7 As shown, in some feasible embodiments, the transformer bank includes at least two first secondary windings 321, wherein the positive output terminal of each first secondary winding 321 is electrically connected to the first light-emitting element group 210.

[0113] For example, the voltages output from the positive output terminals of at least two first secondary windings 321 are equal to provide a power supply voltage to the first light-emitting element group 210. The currents output from the positive output terminals of at least two first secondary windings 321 are equal.

[0114] It should be noted that the first secondary winding 321 of the transformer group will generate a lot of heat when the output current is large, which can easily cause the first light-emitting element group 210 to be in an overheated environment, affecting the light-emitting effect of the first light-emitting element group 210, reducing the accuracy of the emitted light from the first light-emitting element group 210, and thus affecting the light-emitting effect of the first light-emitting element group 210.

[0115] The display device provided in this application embodiment, by providing at least two first secondary windings 321 to power the same first light-emitting element group 210, can reduce the voltage or current on each first secondary winding 321, and further reduce the heat generated during power transmission. Simultaneously, it can increase the area occupied by the positive output terminal of the first secondary winding 321, increasing the heat dissipation space of the first secondary winding 321, further improving the heat dissipation effect of the backlight driving circuit 300, and preventing color shift in the light emitted from the first light-emitting element group 210 and the second light-emitting element group 220 in the backlight module 200 due to excessive temperature. This improves the control precision and control capability of the backlight driving circuit 300 over the light-emitting element group, and enhances the display effect and display quality of the display device.

[0116] like Figure 7 As shown, in some feasible implementations, the positive output terminals of each first secondary winding 321 are used to jointly provide the power supply current for the first light-emitting element group 210.

[0117] For example, the current output at the positive output terminal of each of the first secondary windings 321 can be equal.

[0118] The display device provided in this application embodiment provides current to the first light-emitting element group 210 through at least two first secondary side windings 321, which can reduce the current on each first secondary side winding 321 and further reduce the heat dissipated by the backlight driving circuit 300. Simultaneously, it can increase the area occupied by the positive output terminal of the first secondary side winding 321, increasing the heat dissipation space of the first secondary side winding 321, further improving the heat dissipation effect of the backlight driving circuit 300, and preventing color shift of the light emitted from the first light-emitting element group 210 and the second light-emitting element group 220 in the backlight module 200 due to excessive temperature. Therefore, it can improve the control precision and control capability of the backlight driving circuit 300 over the light-emitting element group, and improve the display effect and display quality of the display device.

[0119] like Figure 8 As shown, in some feasible embodiments, the transformer bank includes two primary windings 310 and two first secondary windings 321. One primary winding 310 corresponds to one first secondary winding 321 and a portion of the second secondary winding 322, and the other primary winding 310 corresponds to another first secondary winding 321 and the remaining portion of the second secondary winding 322.

[0120] For example, the voltage and current input to the primary winding 310 of different transformer banks can be different. The voltage output to the first secondary winding 321 of different transformer banks can be the same, but the current can be different. The number of turns in the first secondary winding 321 of different transformer banks can be different.

[0121] The display device provided in this application embodiment, by setting a transformer group including two primary windings 310 and two first secondary windings 321, can set the voltage and current input on the primary windings 310 corresponding to different second secondary windings 322, so that the output of the secondary windings 320 can be coarsely adjusted by adjusting the input of the primary windings 310. This can further reduce the control difficulty of the voltage conversion circuit 330, improve the voltage regulation efficiency, improve the accuracy of power supply to the light-emitting element group, reduce the power loss generated by energy conversion, improve the energy transmission efficiency of the display device, and improve the display effect and display quality of the display device.

[0122] like Figure 9 As shown, in some feasible implementations, at least two primary windings 310 are connected in series.

[0123] The display device provided in this application embodiment, in the case of a transformer group including two primary windings 310 and two first secondary windings 321, can make the primary windings 310 of different transformer groups share part of the front-end control circuit by connecting at least two primary windings 310 in series. This can further simplify the circuit architecture of the backlight driving circuit 300, reduce the control difficulty of the backlight driving circuit 300, reduce the power loss generated by energy conversion, improve the energy transmission efficiency of the display device, and reduce the manufacturing cost of the display device.

[0124] like Figure 9 As shown, in some feasible embodiments, the positive output terminal of the second secondary winding 322 corresponding to different primary windings 310 is electrically connected to the second light-emitting element group 220 with different supply voltages.

[0125] The display device provided in this application embodiment, by electrically connecting the positive output terminals of the second secondary windings 322 corresponding to different primary windings 310 to the second light-emitting element groups 220 with different supply voltages, can further enhance the control capability of the primary windings 310 of the transformer group on the input voltage of the input terminals of the second light-emitting element groups 220, reduce the adjustment range of the voltage conversion circuit 330, and thus reduce the control difficulty of the voltage conversion circuit 330. This can improve the voltage regulation efficiency of the backlight driving circuit 300, reduce the power loss generated by energy conversion, and thereby improve the energy transmission efficiency of the display device.

[0126] In some feasible implementations, the number of the first secondary winding 321 is positively correlated with the supply current of the first light-emitting element group 210.

[0127] It should be noted that the higher the power supply current of the first light-emitting element group 210, the higher the heat generated by the current transmission.

[0128] The display device provided in this application embodiment, by setting the number of the first secondary side windings 321 to be positively correlated with the supply current of the first light-emitting element group 210, can increase the number of the first secondary side windings 321 when the supply current of the first light-emitting element group 210 is large, thereby improving the heat dissipation efficiency of the backlight driving circuit 300 and enhancing the reliability and stability of the display device. When the supply current of the first light-emitting element group 210 is small, increasing the number of the first secondary side windings 321 can further save on the manufacturing cost of the backlight driving circuit 300, simplify its circuit architecture, reduce the control difficulty of the backlight driving circuit 300, reduce energy loss during energy conversion, and improve the energy transmission efficiency of the display device.

[0129] like Figure 10 As shown, in some feasible embodiments, the display device further includes: a first feedback unit 400, the input terminal of which is used to acquire a first control signal from the first light-emitting element group 210, and the output terminal of which is electrically connected to the input terminal of the primary winding 310 of the transformer group. The first feedback unit 400 is used to provide a first feedback signal according to the first control signal, and the first feedback signal is used to adjust the voltage of the primary winding 310 of the transformer group. The transmission path of the first feedback signal can be referenced... Figure 9 .

[0130] For example, the first feedback signal can be used to control the duty cycle of the S1 and S2 switches to further adjust the input voltage of the primary winding 310 of the transformer bank.

[0131] For example, the first feedback unit 400 may include a driver chip, which is electrically connected to the light-emitting element group in the backlight module 200 and is used to drive different light-emitting element groups to emit light, which can be determined by the driver chip.

[0132] The display device provided in this application embodiment obtains a first control signal from the control terminal of the first light-emitting element group 210 through the input terminal of the first feedback unit 400. Based on the first control signal, the current light-emitting state of the first light-emitting element group 210 can be determined. Furthermore, the difference between the current light-emitting state and the target light-emitting state of the first light-emitting element group 210 can be determined, and a first feedback signal is generated based on this difference. This allows the secondary winding 320 of the transformer group to output a corresponding voltage based on the first feedback signal. This enables the adjustment of the voltage input to the input terminal of the first light-emitting element group 210, improving the accuracy of the light emission of the first light-emitting element group 210 and enhancing its light-emitting effect. Simultaneously, it allows for coarse adjustment of the voltage input to the input terminal of the second light-emitting element group 220, reducing the adjustment range of the voltage conversion circuit 330 and lowering its adjustment difficulty. Furthermore, it improves the accuracy of the output voltage of the backlight driving circuit 300, thereby enhancing the display effect of the display device.

[0133] like Figure 10 As shown, in some feasible embodiments, the display device further includes: a second feedback unit 500, the input terminal of which is used to acquire a second control signal from the second light-emitting element group 220; the second feedback unit 500 is used to generate a second feedback signal based on the second control signal; and the voltage conversion circuit 330 is used to adjust the voltage output by the voltage conversion circuit 330 based on the second feedback signal. The transmission path of the second feedback signal can be referenced... Figure 9 .

[0134] For example, the second feedback unit 500 can determine the fluctuation of the voltage signal output from the positive output terminal of the second secondary winding 322 based on the voltage signal output from the positive output terminal of the first secondary winding 321. Further, based on the voltage signal fluctuation, a second feedback signal is generated so that the voltage output by the voltage conversion circuit 330 can compensate for the fluctuation of the voltage signal output from the positive output terminal of the second secondary winding 322. This can accelerate the adjustment frequency of the voltage conversion circuit 330 and further improve the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group 220.

[0135] For example, such as Figure 11 As shown, when the backlight driving circuit 300 includes two voltage conversion circuits 330, the two voltage conversion circuits 330 can adjust the voltage according to different second feedback signals. In such cases... Figure 11In the display device shown, the first feedback signal FB1 is used to control the duty cycle of the S1 and S2 switching transistors, further adjusting the input voltage of the primary winding 310 of the transformer bank, so that the output voltages of the first secondary winding 321 and the second secondary winding 322 change accordingly. The two second feedback signals FB2 and FB3 are used to adjust the output voltages of the two voltage conversion circuits 330 respectively, further improving the voltage output accuracy of different output terminals of the backlight drive circuit 300.

[0136] The display device provided in this application embodiment obtains a second control signal from the control terminal of the second light-emitting element group 220 through the input terminal of the second feedback unit 500. Based on the second control signal, the current light-emitting state of the second light-emitting element group 220 can be determined. Furthermore, the difference between the current light-emitting state and the target light-emitting state of the second light-emitting element group 220 can be determined, and a second feedback signal is generated based on this difference. This allows the voltage conversion circuit 330 to perform voltage conversion based on the voltage fluctuations of the secondary winding 320 of the transformer group. This ensures that the voltage output from the positive output terminal of the second secondary winding 322 and the voltage output from the output terminal of the voltage conversion circuit 330 meet the power supply voltage required by the second light-emitting element group 220. This accelerates the adjustment frequency of the voltage conversion circuit 330, further improving the stability and accuracy of the input voltage at the input terminal of the second light-emitting element group 220, and improving the accuracy of the output voltage of the backlight driving circuit 300, thereby improving the display effect and display quality of the display device.

[0137] In some feasible implementations, the first light-emitting element group 210 emits red light, and the second light-emitting element group 220 emits light in at least one of green and blue.

[0138] It should be noted that the power supply voltage required for a red-emitting light-emitting element group is approximately 2V, for a green-emitting light-emitting element group it is approximately 3V, and for a blue-emitting light-emitting element group it is approximately 3V to 3.3V. Therefore, the power supply voltage required for green and blue-emitting light-emitting element groups is relatively similar, while the power supply voltage required for red-emitting light-emitting element groups differs significantly from that required for green and blue light-emitting element groups.

[0139] It should be noted that the junction voltage of the red-emitting light-emitting element group is lower than that of the green and blue-emitting light-emitting element groups. Therefore, in order to balance the color temperature of the light-emitting element groups with different colors, it is necessary to increase the supply current of the red-emitting light-emitting element group.

[0140] It should be noted that, as Figure 12 As shown, the display device includes, for example, Figure 11In the case of the backlight module 200 and backlight driver circuit 300 shown, the overall architecture of the display device also includes a lamp board, a motherboard, a motherboard power supply circuit, and a PFC power factor correction circuit. With a 220V AC mains input, the PFC power factor correction circuit performs voltage boosting and power factor correction. For the power output, the entire device requires three voltages: a backlight driver voltage, a 12V power supply voltage for the motherboard and other components, and an 18V audio power supply voltage. Figure 12 In the overall architecture shown, the power supply requires two LLC half-bridge resonant circuits. One of them is a constant voltage output with 12V as the feedback reference to ensure the stable output of the 12V supply voltage. The output of the 18V supply voltage is controlled only by the number of winding turns and does not require separate feedback.

[0141] The display device provided in this application embodiment sets the emission color of the first light-emitting element group 210 to red, so that the primary winding 310 of the transformer group can preferentially adjust the voltage output of the positive output terminal of the first secondary winding 321 according to the power supply voltage required by the first light-emitting element group 210, thereby meeting the power supply requirements of the red-emitting element group. Furthermore, by setting the emission color of the second light-emitting element group 220 to at least one of green and blue, the voltage input to the input terminal of the second light-emitting element group 220 can be coarsely adjusted using the transformer group, and then finely adjusted at high frequency using the voltage conversion circuit 330, to meet the power supply requirements of the light-emitting element group with at least one of green and blue emission colors. In addition, by simplifying the power transmission path of the red-emitting element group, the heat generated by current transmission can be further reduced, the color temperature of the light-emitting element groups with different emission colors within the backlight module 200 can be further balanced, and the display effect and display quality of the display device can be improved.

[0142] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0143] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0144] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display device, characterized in that, include: The display panel includes a light-emitting side and a light-receiving side; A backlight module is located on the light-incident side of the display panel. The backlight module includes at least a first light-emitting element group and a second light-emitting element group, wherein the first light-emitting element group includes a first light-emitting element, the second light-emitting element group includes a second light-emitting element, and the power supply voltage of the first light-emitting element group is not equal to the power supply voltage of the second light-emitting element group. Backlight driving circuit, the backlight driving circuit includes: A transformer bank includes a primary winding and at least two secondary windings. The at least two secondary windings include a first secondary winding and a second secondary winding. The positive output terminal of the first secondary winding is electrically connected to the first light-emitting element group, and the positive output terminal of the second secondary winding is electrically connected to the second light-emitting element group. At least one voltage conversion circuit, wherein the voltage conversion circuit and the second secondary winding are connected in series between the ground terminal and the second light-emitting element group, and the voltage conversion circuit is used to convert the input voltage; The first secondary winding is used to provide the power supply voltage for the first light-emitting element group, and the second secondary winding and the voltage conversion circuit connected in phase are used to jointly provide the power supply voltage for the second light-emitting element group.

2. The display device according to claim 1, characterized in that, The voltage conversion circuit includes a voltage input terminal, which is connected to the positive output terminal of the first secondary winding.

3. The display device according to claim 1, characterized in that, The number of voltage conversion circuits in the backlight driving circuit is equal to the number of the second secondary windings, the second secondary windings correspond to the voltage conversion circuits, and the backlight module includes at least two second light-emitting element groups with different power supply voltages; The positive output terminal of each of the second secondary windings is electrically connected to a second light-emitting element group, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit.

4. The display device according to claim 1, characterized in that, The supply voltage of the first light-emitting element group is less than the supply voltage of the second light-emitting element group.

5. The display device according to claim 1, characterized in that, One of the second secondary windings and one of the voltage conversion circuits are used together to provide the power supply voltage for at least two of the second light-emitting element groups.

6. The display device according to claim 1, characterized in that, The backlight driving circuit includes a voltage conversion circuit, the transformer group includes at least two second secondary windings, and the backlight module includes at least two second light-emitting element groups with different supply voltages; Among them, the positive output terminal of one of the second secondary windings is electrically connected to the second light-emitting element group whose power supply voltage is the first power supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit. The positive output terminal of the other second secondary winding is electrically connected to another second light-emitting element group with a supply voltage of the second supply voltage, and the negative output terminal is electrically connected to the output terminal of the voltage conversion circuit; The number of turns of the coil in the second secondary winding of the second light-emitting element group, which is electrically connected to different power supply voltages, is not equal.

7. The display device according to claim 1, characterized in that, The transformer group includes at least two first secondary windings, wherein the positive output terminal of each first secondary winding is electrically connected to the first light-emitting element group; The positive output terminals of each of the first secondary windings are used to jointly provide the power supply current for the first light-emitting element group.

8. The display device according to claim 7, characterized in that, The transformer group includes two primary windings and two second secondary windings; In this configuration, one primary winding corresponds to one first secondary winding and a portion of the second secondary winding, and another primary winding corresponds to another first secondary winding and the remaining portion of the second secondary winding.

9. The display device according to claim 8, characterized in that, At least two of the primary windings are connected in series; The positive output terminal of the second secondary winding corresponding to a different primary winding is electrically connected to the second light-emitting element group with a different supply voltage.

10. The display device according to claim 7, characterized in that, The number of the first secondary windings is positively correlated with the power supply current of the first light-emitting element group.

11. The display device according to claim 1, characterized in that, Also includes: A first feedback unit, wherein the input terminal of the first feedback unit is used to acquire a first control signal from the first light-emitting element group, and the output terminal of the first feedback unit is electrically connected to the input terminal of the primary winding of the transformer group, the first feedback unit being used to provide a first feedback signal according to the first control signal, the first feedback signal being used to adjust the voltage of the primary winding of the transformer group; and / or, The second feedback unit has an input terminal for acquiring a second control signal from the second light-emitting element group, and an output terminal for being electrically connected to the voltage conversion circuit. The second feedback unit is used to generate a second feedback signal based on the second control signal, and the voltage conversion circuit is used to adjust the voltage output by the voltage conversion circuit based on the second feedback signal.

12. The display device according to any one of claims 1 to 11, characterized in that, The first light-emitting element in the first light-emitting element group emits red light, and the first light-emitting element in the second light-emitting element group emits green light or blue light.

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