Driving circuit, backlight module and display device

Abstract

The present application relates to a driving circuit, a backlight module, and a display device. The driving circuit includes a circuit loop, a control switch, and a protection mechanism. The control switch is connected in series with the circuit loop and is used to control the on and off of the circuit loop. The protection mechanism is located on one side of the control switch and is coupled to the circuit loop. When the current of the circuit loop is greater than or equal to a preset value, the protection mechanism drives the control switch to disconnect the circuit loop. The driving circuit provided in the embodiment of the present application is provided with a protection mechanism. When the current of the circuit loop is greater than or equal to a preset value, the protection mechanism can disconnect the control switch to protect the light board, thereby improving the service life of the display device.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving circuit, a backlight module, and a display device. Background Art

[0002] In the existing technology, with the rapid development of display technology in recent years, electronic devices such as TV (television), MNT (monitor), and NB (notebook) that use Mini LED (Mini light-emitting diode, sub-millimeter light-emitting diode technology) backlight display devices have attracted more and more attention. In terms of display quality, they have the characteristics of high brightness, high color gamut, and high contrast, which can meet the user's good visual experience. However, due to the large number of lamp beads in MiniLED backlight displays, the impact of high current on the lamp board is a major problem. For example, if the current is too high, long-term use is likely to cause damage to the Mini LED lamp board. If it is not handled properly, it will greatly reduce the life of the display. Therefore, how to prevent high current from impacting the lamp board has become an urgent problem to be solved. Summary of the Invention

[0003] The present application provides a driving circuit, a backlight module and a display device to solve the technical problem that a large current impacts a light board and affects the service life of the display device.

[0004] In a first aspect, the present application provides a driving circuit.

[0005] In a second aspect, the present application provides a backlight module comprising the above-mentioned driving circuit.

[0006] In a third aspect, the present application provides a display device comprising the above-mentioned backlight module.

[0007] An embodiment of the present application provides a driving circuit, including a circuit loop, a control switch, and a protection mechanism. The control switch is connected in series to the circuit loop and is used to control the on and off of the circuit loop; the protection mechanism is located on one side of the control switch and is coupled to the circuit loop. When the current of the circuit loop is greater than or equal to a preset value, the protection mechanism drives the control switch to disconnect the circuit loop.

[0008] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0009] The driving circuit provided in the embodiment of the present application is provided with a protection mechanism. When the current of the circuit loop is greater than or equal to a preset value, the protection mechanism can disconnect the control switch to protect the lamp board, thereby increasing the service life of the display device.

[0010] In some embodiments, the protection mechanism includes: a magnetic induction coil, which is coupled to the circuit loop; a moving mechanism, which is arranged on the inner side of the magnetic induction coil in the radial direction and opposite to the control switch. When the current of the circuit loop is greater than or equal to a preset value, the magnetic induction coil generates a magnetic field of a preset strength to drive the moving mechanism to move to the control switch and drive the control switch to disconnect the circuit loop.

[0011] In some embodiments, the moving mechanism includes: a magnetic part, which is suitable for moving under the drive of the magnetic field; a flexible part, which is arranged on the side of the magnetic part facing the control switch. When the current of the circuit loop is greater than or equal to a preset value, the magnetic part moves toward the direction close to the flexible part and drives the flexible part to deform. The flexible part pushes the control switch so that the control switch opens to disconnect the circuit loop.

[0012] In some embodiments, the moving mechanism further includes: a shell, the shell is located on the inner side of the magnetic induction coil in the radial direction, the magnetic part and the flexible part are both arranged in the shell and together with the shell define a accommodating cavity, and liquid is arranged in the accommodating cavity.

[0013] In some embodiments, the driving circuit further includes: a first resetting element, the first resetting element being connected to the magnetic element, and the first resetting element being configured to drive the magnetic element to move in a direction away from the control switch.

[0014] In some embodiments, the first reset member includes: a first elastic member, the first elastic member is connected to the magnetic member and is located on a side of the magnetic member away from the control switch, and the first elastic member pulls the magnetic member in a direction away from the control switch.

[0015] In some embodiments, the driving circuit further includes: a second reset element, the second reset element is connected to the control switch, and the second reset element is used to drive the control switch to close so that the circuit loop is connected.

[0016] In some embodiments, the second reset member includes: a second elastic member, the second elastic member is connected to the control switch and is located on a side of the control switch away from the protection mechanism, and the second elastic member pushes the control switch toward the protection mechanism.

[0017] According to the second aspect of the present application, the backlight module includes: a lamp board and a driving circuit, wherein the lamp board has a plurality of lamp beads; the driving circuit is connected to the plurality of lamp beads and is used to drive the plurality of lamp beads to emit light, and the driving circuit is the driving circuit described above.

[0018] A display device according to an embodiment of the third aspect of the present application includes the backlight module as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 A schematic diagram of the structure of a driving circuit provided in an embodiment of the present application, wherein the circuit loop is in a conducting state;

[0023] Figure 2 A schematic diagram of the structure of a driving circuit provided in an embodiment of the present application, wherein the circuit loop is in a disconnected state;

[0024] Figure 3 A three-dimensional diagram of a protection mechanism provided in an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of a backlight module provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 10. Circuit loop; 20. Control switch;

[0028] 30. Protective mechanism; 31. Magnetic induction coil; 32. Magnetic member; 33. Flexible member; 34. Housing;

[0029] 35. Accommodating cavity; 40. First restoring member; 50. Second restoring member; 60. Lamp board; 61. Lamp beads. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0032] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside." Such spatially relative terms are intended to encompass different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip, a change in posture, or a change in motion, the directional indications may also change accordingly. For example, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" may encompass both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.

[0033] In order to solve the technical problem in the prior art that excessive current in the circuit loop impacts the lamp board and affects the service life of the display device, the present application provides a driving circuit that can prevent excessive current in the circuit loop from impacting the lamp board 60, thereby increasing the service life of the display device. The following description uses the application of the driving circuit to a backlight module as an example, but does not limit this. The backlight module includes a lamp board 60 and a driving circuit, which is used to drive the multiple lamp beads 61 of the lamp board 60 to emit light.

[0034] like Figures 1-4As shown, the driving circuit of the embodiment of the first aspect of the present application includes a circuit loop 10, a control switch 20 and a protection mechanism 30.

[0035] Specifically, if Figure 1 As shown, the control switch 20 is connected in series with the circuit loop 10 and is used to control the on / off state of the circuit loop 10. The protection mechanism 30 is located on one side of the control switch 20 and is coupled to the circuit loop 10. For example, the protection mechanism 30 can be connected in series with the circuit loop 10. When the current in the circuit loop 10 is greater than or equal to a preset value, the protection mechanism 30 drives the control switch 20 to disconnect the circuit loop 10. For example, one of the conductors of the circuit loop 10 is located on one side of the protection mechanism 30. The control switch 20 can have a contact disposed on the conductor. When the contact is separated from the conductor, the circuit loop 10 is disconnected. When the contact remains in contact with the conductor, the circuit loop 10 is connected.

[0036] When the current in the circuit loop 10 is too large, the lamp board 60 will be impacted by the large current and be damaged. Therefore, by setting a protection mechanism 30, when the current in the circuit loop 10 is greater than or equal to the preset value, under the action of the protection mechanism 30, the control switch 20 can be disconnected to protect the lamp board 60, thereby improving the service life of the display device.

[0037] In some embodiments, as Figure 1 As shown, the protection mechanism 30 includes a magnetic induction coil 31 and a moving mechanism. The magnetic induction coil 31 is coupled to the circuit loop 10. The moving mechanism is located radially inward of the magnetic induction coil 31 and opposite the control switch 20. When the current in the circuit loop 10 is greater than or equal to a preset value, the magnetic induction coil 31 generates a magnetic field of a preset strength to drive the moving mechanism to the control switch 20, thereby driving the control switch 20 to disconnect the circuit loop 10. By providing the moving mechanism, the moving mechanism can move toward the control switch 20 to control the opening and closing of the switch 20. This arrangement of driving the control switch 20 through a mechanical connection is simple and reliable.

[0038] In some embodiments, the moving mechanism includes a magnetic member 32 and a flexible member 33. The magnetic member 32 is adapted to move under the influence of a magnetic field; for example, the magnetic member 32 may be an electromagnet. The flexible member 33 is disposed on the side of the magnetic member 32 facing the control switch 20. When the current in the circuit loop 10 is greater than or equal to a preset value, the magnetic member 32 moves toward the flexible member 33 and causes the flexible member 33 to deform. The flexible member 33 pushes the control switch 20, causing the control switch 20 to open and disconnect the circuit loop 10.

[0039] For example, the flexible member 33 can be made of plastic. The flexible member 33 can be a thin film, the middle portion of which can be positioned opposite the control switch 20. The thickness of the film can be relatively thin, making it easier to deform than the outer periphery. This ensures that the film can reliably drive the contacts of the control switch 20 to separate from the circuit loop 10, thereby disconnecting the circuit loop 10. Furthermore, the flexible member 33 can return to its original shape after deformation, ensuring that the film can separate from the control switch 20 after the current decreases, thereby enabling the circuit loop 10 to automatically connect after disconnection.

[0040] When the circuit loop 10 is energized, the magnetic induction coil 31 can generate a magnetic field, the magnetic part 32 can generate a magnetic force, and move toward the direction of the control switch 20, and drive the flexible part 33 to deform toward the direction of the control switch 20. When the current of the circuit loop 10 increases to a preset value, the intensity of the magnetic field increases to a preset intensity. When the magnetic part 32 moves to a preset position, it drives the flexible part 33 to deform to the point where it can contact the control switch 20 and drive the control switch 20 to open, so that the circuit loop 10 is disconnected, thereby protecting the lamp board 60 and improving the service life of the display device.

[0041] In some embodiments, as Figure 1 As shown, the moving mechanism may further include a housing 34, which is located radially inward of the magnetic induction coil 31. The magnetic member 32 and the flexible member 33 are both disposed within the housing 34 and together with the housing 34 define a housing chamber 35. The housing chamber 35 contains a liquid. A liquid with a low compression ratio may be used within the housing chamber 35 to facilitate movement of the magnetic member 32 toward the control switch. For example, the liquid may be water or liquid metal (such as mercury or lead). The housing 34 may be used to mount the magnetic member 32 and the flexible member 33. The inner contour of the housing 34 may be cylindrical, and the magnetic member 32 may move along the axial direction of the housing 34. By providing the housing chamber 35 and disposing the liquid within the housing chamber 35, when the magnetic member 32 moves, the liquid is compressed toward the flexible member 33, causing the flexible member 33 to deform under the force of the liquid. This configuration can reduce the impact force on the flexible member 33, thereby protecting the flexible member 33 and improving the reliability and service life of the protection mechanism 30.

[0042] In some embodiments, as Figure 1 As shown, the drive circuit further includes a first reset member 40, which is connected to the magnetic member 32 and is used to drive the magnetic member 32 to move away from the control switch 20. By providing the first reset member 40, the instantaneous impact force on the flexible member 33 can be further reduced, thereby protecting the flexible member 33 and further improving the reliability and service life of the protection mechanism 30.

[0043] In some embodiments, the drive circuit may further include a second reset element 50 connected to the control switch 20. The second reset element 50 is configured to drive the control switch 20 to close, thereby connecting the circuit loop 10. By activating the second reset element 50, the circuit loop 10 can be reset after being disconnected, thereby automatically disconnecting and connecting the drive circuit, thereby improving the practicality of the display device.

[0044] In some embodiments, the first reset member 40 includes a first elastic member connected to the magnetic member 32 and located on a side of the magnetic member 32 away from the control switch 20, and the first elastic member pulls the magnetic member 32 in a direction away from the control switch 20. For example, the first elastic member may be a spring. Such a configuration of the first elastic member has a simple structure and, on the one hand, can reduce the instantaneous impact force on the flexible member 33 to prevent the flexible member 33 from being damaged by excessive impact force caused by a sudden increase in current, thereby increasing the service life of the flexible member 33. On the other hand, it can facilitate the conduction efficiency of the circuit loop 10 after the circuit is disconnected when the current is less than a preset value, thereby improving the user experience.

[0045] In some embodiments, the second reset member 50 includes a second elastic member connected to the control switch 20 and located on a side of the control switch 20 away from the protection mechanism 30. The second elastic member pushes the control switch 20 toward the protection mechanism 30. For example, the second elastic member may be a spring. Such a second elastic member has a simple structure and can facilitate rapid reconnection of the circuit loop 10 after disconnection, thereby improving the user experience.

[0046] It's easy to understand that a closed, energized solenoid is like a bar magnet, and the right-hand rule can be used to identify the north and south poles of a bar magnet. Hold the solenoid in your right hand, with your four fingers bent in the direction of the current. The end where your thumb points is the north pole of the solenoid.

[0047] exist Figure 2 In the example, when the current increases, according to the right-hand rule, the left end of the magnetic induction coil 31 is the N pole and the right end is the S pole, and the left end of the magnetic member 32 is the S pole and the right end is the N pole. Therefore, the direction of the magnetic force repels the polarity direction of the magnetic member 32. At this time, due to the large current, the magnetic force is large. Therefore, the magnetic member 32 can overcome the pulling force of the first reset member and move toward the direction of the control switch 20, and compress the liquid in the accommodating chamber, causing the flexible member 33 to deform (for example, toward Figure 2 The left side of the control switch 20 is pushed open to disconnect the circuit loop, thereby protecting the circuit loop.

[0048] A second embodiment of the present application provides a backlight module, comprising a lamp panel 60 having a plurality of lamp beads 61 and a drive circuit. The lamp panel 60 has a plurality of lamp beads 61. The drive circuit is connected to the plurality of lamp beads 61 and is used to drive the plurality of lamp beads 61 to emit light. The drive circuit is the drive circuit of the above-described embodiment. For example, the plurality of lamp beads 61 can be arranged in an array, and the protection mechanism 30 can be provided at the edge of the lamp panel 60 and connected to the circuit loop 10. Thus, by providing the protection mechanism 30, the protection mechanism 30 can drive the control switch 20 to disconnect the circuit loop 10 when the current in the circuit loop 10 is greater than or equal to a preset value, thereby protecting the lamp panel 60 and thereby ensuring the service life of the backlight module.

[0049] The third embodiment of the present application provides a display device, which includes a backlight module as described above. For example, the display device can be a display device with a Mini LED backlight, which can be applied to TV (television), MNT (monitor), and NB (notebook). Therefore, the display device is provided with a protection mechanism 30, which can drive the control switch 20 to disconnect the circuit loop 10 when the current of the circuit loop 10 is greater than or equal to a preset value to protect the lamp board 60, thereby ensuring the service life of the display device.

[0050] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0051] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0052] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A driving circuit, characterized in that: include: circuit loop; a control switch, the control switch being connected in series to the circuit loop and being used to control the on / off of the circuit loop; a protection mechanism comprising a magnetic induction coil and a moving mechanism, the protection mechanism being located on one side of the control switch and coupled to the circuit loop; when the current in the circuit loop is greater than or equal to a preset value, the protection mechanism drives the control switch to disconnect the circuit loop; the magnetic induction coil being coupled to the circuit loop; and the moving mechanism being located radially inward of the magnetic induction coil and disposed opposite the control switch; when the current in the circuit loop is greater than or equal to a preset value, the magnetic induction coil generates a magnetic field of a preset strength to drive the moving mechanism to move to the control switch and drive the control switch to disconnect the circuit loop; The moving mechanism includes a magnetic part and a flexible part. The magnetic part is suitable for moving under the drive of the magnetic field. The flexible part is arranged on the side of the magnetic part facing the control switch. When the current of the circuit loop is greater than or equal to a preset value, the magnetic part moves in a direction close to the flexible part and drives the flexible part to deform. The flexible part pushes the control switch so that the control switch is opened to disconnect the circuit loop.

2. The driving circuit according to claim 1, wherein: The moving mechanism further includes a shell, which is located on the inner side of the magnetic induction coil in the radial direction. The magnetic component and the flexible component are both arranged in the shell and together with the shell define a accommodating cavity, in which liquid is arranged.

3. The driving circuit according to claim 1, wherein: Also includes: A first restoring member is connected to the magnetic member, and is used to drive the magnetic member to move in a direction away from the control switch.

4. The driving circuit according to claim 3, wherein: The first resetting member includes a first elastic member connected to the magnetic member and located on a side of the magnetic member away from the control switch, and the first elastic member pulls the magnetic member in a direction away from the control switch.

5. The driving circuit according to claim 1, wherein: Also includes: A second reset element is connected to the control switch, and the second reset element is used to drive the control switch to close so that the circuit loop is connected.

6. The driving circuit according to claim 5, characterized in that: The second resetting member includes a second elastic member connected to the control switch and located on a side of the control switch away from the protection mechanism, and the second elastic member pushes the control switch toward the protection mechanism.

7. A backlight module, characterized in that: include: A light board, wherein the light board has a plurality of light beads; A driving circuit, wherein the driving circuit is connected to the plurality of lamp beads and is used to drive the plurality of lamp beads to emit light, and the driving circuit is the driving circuit according to any one of claims 1 to 6.

8. A display device, characterized in that: It comprises the backlight module according to claim 7.

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