Backlight module and display device

Abstract

This invention discloses a backlight module and a display device. The backlight module has an installation space, including: a back plate covering an opening at one end of the installation space; a dust removal structure including: a moisture-absorbing element movably disposed on the back plate, wherein the moisture-absorbing element has a preset position relative to the back plate, and the moisture-absorbing element can absorb moisture to leave the preset position under gravity; a reset device cooperating with the moisture-absorbing element and configured to provide a force to the moisture-absorbing element to drive it closer to the preset position; and a fan assembly configured to drive airflow to remove dust from the installation space and dry the moisture-absorbing element. The fan assembly can turn on in response to the moisture-absorbing element leaving the preset position and can turn off in response to the moisture-absorbing element reaching the preset position. This invention uses the change in gravity of the moisture-absorbing element to cause position switching, and the fan assembly responds to the position of the moisture-absorbing element to turn on or off, so as to realize the intermittent dust removal of the backlight module by the fan assembly, achieving the purpose of periodic dust removal.

Description

Technical Field

[0001] This application relates to the field of display devices, and particularly to backlight modules and display devices. Background Technology

[0002] Some display devices include display panels and backlight modules. The display panel includes structures such as an array substrate, a color filter substrate, and a liquid crystal layer in the middle. The backlight module includes a back plate, a middle frame, a light source, a light guide plate, and a film. The middle frame encloses the installation space, and the film, light source, and light guide plate are set in the installation space. The back plate is generally snapped into the middle frame by a snap-fit ​​structure and covers an opening on one side of the installation space. Considering component tolerances and assembly, an assembly gap needs to be left at the snap-fit ​​part between the back plate and the middle frame. Moreover, the middle frame is generally made of plastic, and the back plate is generally made of metal. During assembly or module vibration, the middle frame may be scraped at the contact point with the back plate, generating debris. This debris can easily enter the installation space through the gaps. Secondly, since the backlight module requires external power supply, the back plate is often perforated, and dust from the environment can also enter the installation space of the backlight module through these gaps and holes. After a period of time, dust, debris and other dust can easily accumulate between the optical films in the installation space, forming local shadows. This not only affects the optical uniformity of the backlight module, but also causes the films to be scratched after dust enters between the layers of films. The scratched areas will show optical white spots, affecting the display quality. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a backlight module and display device with periodic automatic dust removal.

[0004] According to one aspect of the embodiments of this application, a backlight module is disclosed, which has an installation space therein. The backlight module includes a back plate covering an opening at one end of the installation space. A dust removal structure includes: a moisture-absorbing element movably disposed on the back plate, wherein the moisture-absorbing element has a preset position relative to the back plate, and the moisture-absorbing element can absorb moisture to leave the preset position under the action of gravity; a reset device cooperating with the moisture-absorbing element and configured to provide a force to the moisture-absorbing element for driving the moisture-absorbing element to approach the preset position; and a fan assembly configured to drive airflow to remove dust from the installation space and dry the moisture-absorbing element, the fan assembly being associated with the moisture-absorbing element and being able to turn on in response to the moisture-absorbing element leaving the preset position and to turn off in response to the moisture-absorbing element reaching the preset position.

[0005] In one exemplary embodiment, the reset device includes a first magnetic member and a second magnetic member. The first magnetic member is disposed on the moisture-absorbing member, and the second magnetic member is disposed on the back plate. The magnetic attraction between the first magnetic member and the second magnetic member is used to drive the moisture-absorbing member to move closer to the preset position.

[0006] In one exemplary embodiment, the fan assembly includes: a fan body for driving airflow to remove dust from the installation space and dry the moisture-absorbing element; and a detection element electrically connected to the fan body for sensing and detecting the first magnetic element, and controlling the fan body to close in response to the first magnetic element reaching the preset position, and controlling the fan body to open in response to the first magnetic element leaving the preset position.

[0007] In one exemplary embodiment, the back panel is provided with ventilation holes that communicate with the mounting space, and the fan body of the fan assembly is housed within the ventilation holes; the moisture-absorbing member is opposite to the ventilation holes, and the moisture-absorbing member moves away from or towards the preset position relative to the back panel, wherein when the moisture-absorbing member is located at the preset position, the moisture-absorbing member abuts against the back panel and covers one end of the ventilation hole, and when the moisture-absorbing member leaves the preset position, the moisture-absorbing member separates from the back panel, thereby forming a ventilation gap between the moisture-absorbing member and the back panel that communicates with the ventilation holes.

[0008] In one exemplary embodiment, it further includes: a guide structure configured to guide the movement of the moisture-absorbing member relative to the back panel, wherein the moisture-absorbing member moves along the guide structure to approach or move away from the preset position.

[0009] In one exemplary embodiment, the guide structure includes a slide rod and a guide hole. One end of the slide rod is connected to the back plate, and the other end of the slide rod is provided with a slider. The guide hole is disposed on the moisture-absorbing element and extends in a direction away from the back plate. The end of the guide hole near the back plate narrows to form a bayonet. The outer diameter of the slider is larger than the inner diameter of the bayonet. The slide rod passes through the bayonet, and the slider is located in the guide hole and can move back and forth along the extension direction of the guide hole. The axial direction of the ventilation hole is perpendicular to the direction of gravity. The slide rod and the guide hole both extend away from the back plate and obliquely towards the direction of gravity of the moisture-absorbing element. Alternatively, the axial direction of the ventilation hole is parallel to the direction of gravity, and the extension directions of the slide rod and the extension directions of the guide hole are both parallel to the direction of gravity.

[0010] In one exemplary embodiment, the device further includes: a filter screen disposed on the back plate, the ventilation hole having an air inlet end and an air outlet end, the filter screen covering the air inlet end of the ventilation hole, and when the moisture-absorbing member is located at the preset position, the moisture-absorbing member covering the air outlet end of the ventilation hole.

[0011] In one exemplary embodiment, the device further includes an electric field element configured to form an electric field within the mounting space, wherein the fan assembly is disposed on the negative side of the electric field.

[0012] In one exemplary embodiment, the moisture-absorbing component includes a box and a desiccant, the desiccant being filled inside the box, and the outer wall of the box having a plurality of vent holes.

[0013] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0014] In the dust removal structure disclosed in this application, the moisture-absorbing component has a preset position relative to the back plate. The moisture-absorbing component is associated with the fan assembly. Under its own gravity, the moisture-absorbing component tends to leave the preset position. The reset device provides a pulling force to the moisture-absorbing component that is opposite to the direction of gravity of the moisture-absorbing component, so that the moisture-absorbing component tends to move closer to the preset position. When the moisture-absorbing component absorbs moisture and increases in weight until its weight overcomes the pulling force of the reset device, the moisture-absorbing component leaves the preset position, and the fan assembly turns on. When the fan assembly continues to turn on, the moisture-absorbing component is dried by the fan assembly, its weight is reduced, and it is pulled back to the preset position by the reset device, and then the fan assembly turns off. This invention causes position switching through the change in the gravity of the moisture-absorbing component. The fan assembly responds to the position of the moisture-absorbing component to turn on or off, so that the fan assembly intermittently removes dust from the installation space of the backlight module, achieving the purpose of periodic dust removal, reducing the accumulation of dust between the films inside the installation space, reducing local shadows, improving the optical uniformity of the backlight module, and thus improving the display quality of the screen.

[0015] According to one aspect of the embodiments of this application, a display device is disclosed, including a display panel and the dust removal structure described above, wherein the display panel covers the opening at the other end of the installation space.

[0016] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0017] The display panel disclosed in this application switches its position by changing the gravity of the moisture-absorbing component after it absorbs moisture. The fan assembly responds to the position of the moisture-absorbing component to turn on or off, so that the fan assembly intermittently removes dust from the installation space of the backlight module, thereby achieving the purpose of periodic dust removal, reducing the accumulation of dust between the films inside the installation space, reducing local shadows, improving the optical uniformity of the backlight module, and thus improving the display quality.

[0018] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

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

[0020] Figure 1 This is a schematic diagram of the dust removal structure provided in Embodiment 1 of this application;

[0021] Figure 2 for Figure 1 A magnified view of a section A in the middle, showing the fan assembly in the off state;

[0022] Figure 3 This is a partial enlarged view of the dust removal structure provided in Embodiment 1 of this application, wherein the fan assembly is in the on state;

[0023] Figure 4 This is a schematic diagram of the dust removal structure provided in Embodiment 2 of this application, wherein the dust removal structure also includes a filter screen;

[0024] Figure 5 This is a schematic diagram of the dust removal structure provided in Embodiment 3 of this application;

[0025] Figure 6 This is a partial enlarged view of the dust removal structure provided in Embodiment 3 of this application, wherein the fan assembly is in the on state;

[0026] Figure 7 This is a schematic diagram illustrating the effect of an internal electric field on dust in a dust removal structure provided in an embodiment of this application.

[0027] Figure 8 A cross-sectional view of a display device provided in an embodiment of this application, including a backlight module and a display panel;

[0028] Figure 9 A rear view of a display device provided in an embodiment of this application;

[0029] Figure 10 A side view of a display device provided in an embodiment of this application;

[0030] Figure 11 A side view of a display device provided in an embodiment of this application.

[0031] The annotations in the attached figures are explained as follows:

[0032] 100-Back panel, 101-Ventilation hole, 110-Moisture-absorbing component, 120-Fan body, 130-Guide structure, 211-Slide bar, 212-Slide ball, 213-Guide hole, 214-Bayonet, 221-Box, 222-Desiccant, 310-Ventilation gap, 320-First magnetic component, 330-Second magnetic component, 410-Filter, 710-Negative side, 810-Backlight module, 811-Middle frame, 812-Light guide plate, 813-Diameter, 820-Display panel, 830-Dust removal structure, 910-Display device. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this application will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0034] In the description of this invention, all connection relationships mentioned do not refer to direct connection of components, but rather to the ability to form a better connection structure by adding or removing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceeding" are understood to exclude the number itself, and "above", "below", "within" are understood to include the number itself.

[0038] Reference Figure 1This application provides a backlight module 810, which has an internal installation space. The backlight module 810 includes a backplate 100 and a dust removal structure 830. The backplate 100 covers an opening at one end of the installation space. The dust removal structure 830 includes a moisture-absorbing element 110, a reset device, and a fan assembly. The moisture-absorbing element 110 is movably disposed on the backplate 100. The movement of the moisture-absorbing element 110 relative to the backplate 100 has a preset position. The moisture-absorbing element 110 can absorb moisture to prevent it from falling under gravity. The device moves away from the preset position under the action of the moisture-absorbing element 110; the reset device cooperates with the moisture-absorbing element 110 and is configured to provide a force to the moisture-absorbing element 110 to drive it toward the preset position; the fan assembly is configured to drive airflow to remove dust from the installation space and to drive airflow to dry the moisture-absorbing element 110. The fan assembly is associated with the moisture-absorbing element 110 and can be turned on in response to the moisture-absorbing element 110 moving away from the preset position and can be turned off in response to the moisture-absorbing element 110 reaching the preset position. The moisture-absorbing component 110 can absorb moisture. The change in gravity caused by the moisture-absorbing component 110 absorbing moisture or being dried by the fan assembly allows the position of the moisture-absorbing component 110 relative to the back panel 100 to switch. The fan assembly responds to the position of the moisture-absorbing component 110 to turn on or off, so that the fan assembly intermittently removes dust from the backlight module 810, achieving the purpose of periodic dust removal, reducing the accumulation of dust between the diaphragms 813 inside the installation space, reducing local shadows, improving the optical uniformity of the backlight module 810, and thus improving the display quality.

[0039] Reference Figure 2 and Figure 3 In Embodiment 1, the backlight module 810 includes a backplate 100 with ventilation holes 101. The fan assembly includes a fan body 120, which drives airflow to remove dust from the installation space and dry the moisture-absorbing component 110. The fan body 120 is housed within the ventilation holes 101. The moisture-absorbing component 110 is opposite to the ventilation holes 101, allowing the fan body 120 to dry the moisture-absorbing component 110. The moisture-absorbing component 110 moves away from the backplate 100. Or it can be close to a preset position. When the moisture-absorbing component 110 is in the preset position, the moisture-absorbing component 110 abuts against the back panel 100 and covers one end of the ventilation hole 101. At this time, the fan body 120 is closed. When the moisture-absorbing component 110 leaves the preset position, the moisture-absorbing component 110 separates from the back panel 100, so that a ventilation gap 310 is formed between the moisture-absorbing component 110 and the back panel 100. The ventilation gap 310 is connected to the ventilation hole 101. At this time, the fan body 120 is turned on.

[0040] Specifically, when the moisture-absorbing component 110 leaves the preset position under its own gravity, a ventilation gap 310 is formed between the moisture-absorbing component 110 and the back panel 100. The ventilation gap 310 and the ventilation hole 101 are interconnected to form an air outlet channel, allowing dust inside the installation space to be discharged through the air outlet channel driven by the airflow driven by the fan body 120. The ventilation gap 310 connects the ventilation hole 101 with the external space, ensuring that dust is blown out of the backlight module 810 with the airflow, reducing a series of adverse effects caused by dust entering the backlight module 810, such as local shadows and scratches on the diaphragm 813. At the same time, the airflow disturbance caused by the fan body 120 can dissipate heat from the backlight module 810 and also assist the moisture-absorbing component 110 in drying, improving the service life and reliability of the backlight module 810. When the moisture-absorbing component 110 returns to the preset position, the ventilation gap 310 closes, reducing the amount of dust entering the installation space of the backlight module 810.

[0041] The direction of gravity of the moisture-absorbing component 110 is opposed to the resetting force provided to the moisture-absorbing component 110 by the resetting device. In this embodiment, the resetting device includes a first magnetic suction component 320 and a second magnetic suction component 330. The first magnetic suction component 320 is disposed on the moisture-absorbing component 110, and the second magnetic suction component 330 is disposed on the back plate 100. The magnetic attraction between the first magnetic suction component 320 and the second magnetic suction component 330 is used to drive the moisture-absorbing component 110 closer to the preset position. Specifically, there is a continuous magnetic attraction between the first magnetic suction component 320 and the second magnetic suction component 330, so that the moisture-absorbing component 110 is always subjected to a resetting force moving towards the back plate 100. When the moisture-absorbing component 110 is dried to the point that its weight is less than the magnetic attraction force, the moisture-absorbing component 110 can automatically reset to the preset position. When the moisture-absorbing component 110 absorbs moisture and its weight increases to the point that its weight is greater than the magnetic attraction force, the moisture-absorbing component 110 can detach from the preset position. The structure is simple, maintenance is convenient, and the service life is long.

[0042] Alternatively, the reset device may include a reset spring, which is in a stretched or compressed state according to a preset position. The two ends of the reset spring are respectively connected to the moisture-absorbing member 110 and the back plate 100, so that the reset spring has the force to push or pull the moisture-absorbing member 110 to the preset position.

[0043] In practice, the fan assembly includes a fan body 120 and a detection element. The detection element is electrically connected to the fan body 120 and is used to sense and detect the first magnetic attractor 320. The detection element controls the fan body 120 to close in response to the first magnetic attractor 320 reaching the preset position, and controls the fan body 120 to open in response to the first magnetic attractor 320 leaving the preset position. In this embodiment, the detection element can be a magnetic switch, which controls the opening and closing of the fan body 120 based on whether the first magnetic attractor 320 has reached the preset position. This design is reliable, compact, and low-cost. It eliminates the need for a separate timer, enabling the fan assembly to intermittently clean the installation space inside the backlight module 810, achieving the purpose of periodic dust removal and reducing energy consumption. Alternatively, the fan assembly may include a fan body 120, an infrared sensor, a controller, and a switching element. The switching element is electrically connected to the fan body 120. The infrared sensor is used to detect whether the moisture-absorbing element 110 with the first magnetic attractant 320 has reached a preset position. Both the switching element and the infrared sensor are electrically connected to the controller. After receiving the signal from the infrared sensor that the moisture-absorbing element 110 has reached the preset position, the controller sends a disconnect signal to the switching element to turn off the fan. After receiving the signal from the infrared sensor that the moisture-absorbing element 110 has left the preset position, the controller sends a connection signal to the switching element to turn on the fan.

[0044] Furthermore, the dust removal structure 830 also includes a guide structure 130 configured to guide the movement of the moisture-absorbing member 110 relative to the back plate 100, wherein the moisture-absorbing member 110 moves along the guide structure 130 to approach or move away from the preset position. Specifically, the guide structure 130 can guide the moisture-absorbing member 110 to approach or move away from the preset position, improving the movement stability of the moisture-absorbing member 110 and ensuring that the moisture-absorbing member 110 can accurately enter the preset position.

[0045] Reference Figures 1 to 6 The back panel 100 includes a plate and a cylinder. The plate has a mounting through hole, and one end of the cylinder is connected to the mounting through hole. The cylinder forms a ventilation hole 101. The fan body 120 is located inside the cylinder. The moisture-absorbing component 110 can approach the cylinder and enter a preset position to close the ventilation gap 310, or it can move away from the cylinder and leave the preset position, so that the end face of the moisture-absorbing component 110 close to the cylinder and the outer periphery of the end of the cylinder away from the plate form a circumferential ventilation gap 310, thereby improving the smoothness and uniformity of airflow.

[0046] The guide structure 130 includes a slide rod 211 and a guide hole 213. One end of the slide rod 211 is connected to the end of the cylinder away from the plate, and the other end of the slide rod 211 is provided with a ball 212. The guide hole 213 is provided on the moisture-absorbing component 110. The guide hole 213 extends in a direction away from the back plate 100. The end of the guide hole 213 near the back plate 100 narrows to form a bayonet 214. The outer diameter of the ball 212 is larger than the inner diameter of the bayonet 214. The slide rod 211 passes through the bayonet 214. The ball 212 is located in the guide hole 213 and can move back and forth along the extension direction of the guide hole 213. The structure of the ball 212 and the guide hole 213 can reduce friction, improve the smoothness of movement, and at the same time reduce the activity space and volume.

[0047] Combination Figures 1 to 3 In Embodiment 1, the axial direction of the ventilation hole 101 is parallel to the direction of gravity, and the direction of gravity is downward. The ventilation hole 101 faces downward and is directly opposite the moisture-absorbing component 110. The extension direction of the slide rod 211 and the extension direction of the guide hole 213 are both parallel to the direction of gravity. Specifically, when the weight of the moisture-absorbing component 110 exceeds the reset force of the reset device on the moisture-absorbing component 110, the moisture-absorbing component 110 falls, causing the guide hole 213 to move and be partially limited by the latch 214 on the slider 212, preventing the moisture-absorbing component 110 from completely falling off the back plate 100. At this time, a ventilation gap 310 is opened between the top surface of the moisture-absorbing component 110 and the bottom surface of the cylinder. When the weight of the moisture-absorbing component 110 is less than the reset force of the reset device on the moisture-absorbing component 110, the reset device drives the moisture-absorbing component 110 to reset. The guide hole 213 moves, causing the slider 212 to slide into the guide hole 213 on the side away from the latch 214, until the top surface of the moisture-absorbing component 110 is attached to the bottom surface of the cylinder and seals the ventilation gap 310. It should be noted that after opening, the vertical width of the ventilation gap 310 is less than or equal to the vertical width of the guide hole 213, ensuring that the ventilation gap 310 can be completely closed by the moisture-absorbing component 110, reducing the amount of dust entering the installation space inside the backlight module 810.

[0048] Combination Figures 5 to 6 In Embodiment 2, the axial direction of the ventilation hole 101 is perpendicular to the direction of gravity. At this time, the back plate 100 is placed vertically with gravity pointing downwards. The ventilation hole 101 faces the moisture-absorbing component 110 horizontally. The slide rod 211 and the guide hole 213 both extend away from the back plate 100 and obliquely towards the direction of gravity of the moisture-absorbing component 110. Both the slide rod 211 and the guide hole 213 extend obliquely downwards away from the back plate 100. Under the influence of its gravitational force, the moisture-absorbing component 110 moves obliquely downwards along the guide rod, allowing the ventilation gap 310 to open and close smoothly.

[0049] In fact, at least two guide structures 130 are provided at intervals to further improve the movement stability of the moisture-absorbing component 110. Specifically, at least two slide rods 211 are provided around the outer periphery of the cylinder, and guide holes 213 are provided on the moisture-absorbing component 110 corresponding to the position and number of slide rods 211.

[0050] Alternatively, multiple air outlets can be provided circumferentially at the end of the cylinder away from the plate. The air outlets are connected to the ventilation holes 101. When the moisture-absorbing component 110 is in the preset position, the end of the cylinder away from the plate is embedded in the moisture-absorbing component 110, so that the moisture-absorbing component 110 blocks the air outlet. When the moisture-absorbing component 110 moves away from the cylinder and leaves the preset position, the air outlet is gradually exposed, so that the ventilation holes 101 are connected to the outside through the air outlet.

[0051] In this embodiment, the first magnetic suction member 320 is disposed on the side of the guide hole 213 away from the bayonet 214, and the second magnetic suction member 330 is disposed on the slider 212.

[0052] It should be noted that when the moisture-absorbing component 110 leaves the preset position, the moisture-absorbing component 110 is subjected to its own weight, the blowing force of the fan body 120 on the moisture-absorbing component 110, and the reset force provided by the reset device. Strictly speaking, the reset force needs to be greater than the sum of the weight of the moisture-absorbing component 110 and the blowing force of the fan body 120 for the moisture-absorbing component 110 to reset to the preset position. However, since the ventilation hole 101 is connected to the outside, the blowing force of the wind force generated by the fan body 120 on the moisture-absorbing component 110 is much smaller than the reset force and the weight of the moisture-absorbing component 110. Therefore, in actual judgment, the wind force generated by the fan body 120 can be ignored and analyzed.

[0053] Reference Figure 5 Considering ease of cleaning and thorough dust removal, the dust removal structure 830 in Embodiment 3 also includes a filter screen 410. The filter screen 410 is disposed on the back plate 100. The ventilation hole 101 has an air inlet end and an air outlet end. The filter screen 410 covers the air inlet end of the ventilation hole 101. When the moisture-absorbing member 110 is located in the preset position, the moisture-absorbing member 110 covers the air outlet end of the ventilation hole 101.

[0054] When the fan body 120 is turned on, it can drive the airflow through the filter screen 410, the fan body 120 and the moisture absorption component 110 in sequence, and finally discharge it to the outside. Dust is intercepted when it is discharged with the airflow and is attached to the filter screen 410, which prevents the dust from flying around after the airflow is discharged through the gap. This improves the cleanliness of the environment in which the backlight module 810 is used, reduces the accumulation of dust in the dead corners of the dust removal structure 830 and other structures such as the fan body 120, and reduces the impact on the dust removal performance.

[0055] In actual use, the filter screen 410 is detachably mounted on the back plate 100. After dust removal is completed, the filter screen 410 can be removed for cleaning. In this embodiment, the cylindrical part of the back plate 100 has an installation slot on its side wall. The installation slot extends around the circumference of the cylindrical part. The installer can directly insert the filter screen 410 into the installation slot for positioning. When it is necessary to remove the filter screen 410, it can be pulled out to remove it, which is convenient and quick.

[0056] In some specific embodiments, the moisture-absorbing component 110 includes a box 221 and a desiccant 222, the desiccant 222 being filled inside the box 221, and the outer wall of the box 221 having multiple ventilation holes. The moisture-absorbing effect is achieved by filling the perforated box 221 with desiccant 222, so that when the moisture-absorbing component 110 is in a preset position, it can cover one end of the ventilation hole 101.

[0057] In addition, the box 221 has a transparent structure, so that when the moisture-absorbing component 110 is displaced by gravity, the moisture-absorbing component 110 can always cover the ventilation hole 101 without forming a ventilation gap, thus increasing the airtightness of the device.

[0058] Reference Figure 7 Furthermore, the dust removal structure 830 also includes an electric field component, which is disposed on the back plate 100 or the middle frame 811 to form an electric field at the position corresponding to the mounting space of the backlight module 810. The fan assembly is disposed on the negative electrode side 710 of the electric field. The electric field component and the fan body 120 are turned on simultaneously, and the electric field polarizes the dust, causing the dust to become positively charged and be attracted by the negative electrode side 710 of the electric field. Finally, the dust is extracted by the start of the fan body 120.

[0059] In this embodiment, in order to facilitate installation and power supply, the electric field components are arranged on both sides of the backlight module 810 and form a polarized electric field parallel to the optical film layer. The detection elements are electrically connected to the fan body 120 and the electric field components, so that after the moisture-absorbing component 110 leaves the preset position, the fan body 120 and the electric field components can be turned on at the same time.

[0060] In addition, the backlight module 810 is used in a passive light emission display to illuminate the display screen. The backlight module 810 is generally classified into two types based on the light incident method: direct-lit and side-lit. This embodiment does not limit the specific type of backlight module 810.

[0061] Reference Figure 8This application also provides a display device 910, which includes a display panel 820 and the aforementioned backlight module 810. The display panel 820 includes a middle frame 811 and a dust removal structure 830. The backlight module 810 includes a back plate 100, a middle frame 811, a light source, a light guide plate 812, a diaphragm 813, etc. The middle frame 811 encloses an installation space. The back plate 100 and the middle frame 811 are snap-fitted together and cover one end opening of the installation space. The display panel 820 covers the other end of the installation space. With one end open, the dust removal structure 830 includes a moisture-absorbing component 110, a reset device, and a fan assembly. The position of the moisture-absorbing component 110 is switched by the change in gravity after absorbing moisture. The fan assembly responds to the position of the moisture-absorbing component 110 to turn on or off, so that the fan assembly can intermittently remove dust from the installation space, achieving the purpose of periodic dust removal, reducing dust accumulation between the diaphragms 813, reducing local shadows, improving the optical uniformity of the backlight module 810, and thus improving the display quality.

[0062] To improve dust removal efficiency, the dust removal structure 830 can be provided with two or more at intervals on the back plate 100, as shown in the reference. Figure 9 In this embodiment, the display device 910 is placed vertically, and the three dust removal structures 830 are arranged horizontally at intervals at the lower position of the back plate 100.

[0063] Reference Figure 10 and Figure 11 The display device 910 is placed vertically. The mounting surface of the dust removal structure 830 on the back plate 100 can be vertical or inclined, as long as the moisture absorption component 110 can be moved.

[0064] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A backlight module having an internal mounting space, characterized in that, include: A backplate that covers an opening at one end of the mounting space; Dust removal structure, including: A moisture-absorbing element is movably disposed on the back panel, wherein the movement of the moisture-absorbing element relative to the back panel has a preset position, and the moisture-absorbing element can be used to absorb moisture so as to leave the preset position under the action of gravity; A reset device, in cooperation with the moisture-absorbing element, is configured to provide a force to the moisture-absorbing element for driving the moisture-absorbing element toward the preset position; A fan assembly configured to drive airflow to remove dust from the installation space and dry the moisture-absorbing element, the fan assembly being associated with the moisture-absorbing element and being able to turn on in response to the moisture-absorbing element leaving the preset position and to turn off in response to the moisture-absorbing element reaching the preset position; The back panel is provided with ventilation holes, which are connected to the installation space, and the fan body of the fan assembly is housed in the ventilation holes; The moisture-absorbing element is opposite to the ventilation hole. The moisture-absorbing element moves away from or towards the preset position relative to the back plate. When the moisture-absorbing element is in the preset position, the moisture-absorbing element abuts against the back plate and covers one end of the ventilation hole. When the moisture-absorbing element leaves the preset position, the moisture-absorbing element separates from the back plate, forming a ventilation gap between the moisture-absorbing element and the back plate that communicates with the ventilation hole.

2. The backlight module according to claim 1, characterized in that, The reset device includes a first magnetic element and a second magnetic element. The first magnetic element is disposed on the moisture-absorbing element, and the second magnetic element is disposed on the back plate. The magnetic attraction between the first magnetic element and the second magnetic element is used to drive the moisture-absorbing element to move closer to the preset position.

3. The backlight module according to claim 2, characterized in that, The fan assembly includes: The fan body is used to drive airflow to remove dust from the installation space and dry the moisture-absorbing component; A detection element, electrically connected to the fan body, is used to sense and detect the first magnetic component, and to control the fan body to close in response to the first magnetic component reaching the preset position, and to control the fan body to open in response to the first magnetic component leaving the preset position.

4. The backlight module according to claim 1, characterized in that, Also includes: A guide structure is configured to guide the movement of the moisture-absorbing element relative to the back plate, wherein the moisture-absorbing element moves along the guide structure to approach or move away from the preset position.

5. The backlight module according to claim 4, characterized in that, The guide structure includes a slide rod and a guide hole. One end of the slide rod is connected to the back plate, and the other end of the slide rod is provided with a slider. The guide hole is provided on the moisture-absorbing element and extends in a direction away from the back plate. The end of the guide hole near the back plate narrows to form a bayonet. The outer diameter of the slider is larger than the inner diameter of the bayonet. The slide rod passes through the bayonet, and the slider is located in the guide hole and can move back and forth along the extension direction of the guide hole. The axial direction of the ventilation hole is perpendicular to the direction of gravity, and the slide rod and the guide hole both extend away from the back plate and obliquely towards the direction of gravity of the moisture-absorbing element; or The axial direction of the ventilation hole is parallel to the direction of gravity, and the extension directions of the slide rod and the guide hole are both parallel to the direction of gravity.

6. The backlight module according to claim 1, characterized in that, Also includes: A filter screen is disposed on the back plate. The ventilation hole has an air inlet end and an air outlet end. The filter screen covers the air inlet end of the ventilation hole. When the moisture-absorbing element is located at the preset position, the moisture-absorbing element covers the air outlet end of the ventilation hole.

7. The backlight module according to claim 1, characterized in that, Also includes: An electric field component is configured to generate an electric field within the installation space, and the fan assembly is disposed on the negative side of the electric field.

8. The backlight module according to claim 1, characterized in that, The moisture-absorbing component includes a box and a desiccant, the desiccant being filled inside the box, and the outer wall of the box having multiple ventilation holes.

9. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 8, wherein the display panel covers an opening at the other end of the mounting space.

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