Backlight device of liquid crystal display screen

Abstract

The utility model belongs to the technical field of mechanical structures and manufacturing, and particularly relates to a backlight device of a liquid crystal display screen, which comprises a shell, a back plate is mounted at the top of the shell, a limiting buffer mechanism is arranged between the shell and the back plate, and fastening mechanisms are arranged at four corners of an inner cavity of the shell. According to the backlight module, the positioning columns are matched with the positioning grooves, so that the light guide plate can be accurately positioned in the mounting cavity, the position stability of the light guide plate in the working process is ensured, and the light guide plate cannot deviate due to factors such as external force, so that the uniformity and the stability of backlight are ensured, and the display effect can be improved; when the device is impacted or vibrated by external force, such as bumping or accidental collision in the transportation process, the buffer springs can absorb and buffer the external force, damage to the light guide plate and other internal parts is reduced, the probability of faults such as part damage and displacement caused by impact is reduced, and the service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical structure and manufacturing technical field, concretely relates to the backlight device of liquid crystal display screen. BACKGROUND

[0002] Backlight module originates from liquid crystal display technology in the 1970s, initially adopts simple side light type design, and light source is introduced from the side of liquid crystal display and diffused to the whole screen through light guide plate. With the continuous development of liquid crystal display technology, especially the application field of color liquid crystal display is continuously widened, and the requirement to backlight is higher and higher.

[0003] In the conventional backlight device of liquid crystal display screen, the light guide plate in the shell can be deviated or loose due to the imperfect installation structure, which affects the uniformity of backlight effect, and when being subjected to vibration or impact, the internal components are prone to damage due to the lack of effective buffer structure. In view of this, the utility model provides a backlight device of liquid crystal display screen to solve the above problems. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a backlight device of liquid crystal display screen to achieve the above purposes and solve the problems of inaccurate installation and positioning and easy loosening of the light guide plate.

[0005] To achieve the above purposes, the utility model provides the following technical scheme: a backlight device of liquid crystal display screen, comprising a shell, a back plate is installed at the top of the shell, a limiting buffer mechanism is arranged between the shell and the back plate, and a fastening mechanism is arranged at the four corners of the inner cavity of the shell.

[0006] The limiting buffer mechanism comprises a light guide plate, a positioning groove, a positioning column, an installation cavity, a limiting seat and a pressing plate, the inner cavity of the shell is provided with an installation cavity, a group of symmetrical positioning columns are fixedly connected to the surface of the installation cavity, the light guide plate is arranged in the installation cavity, the positioning groove matched with the positioning column is formed in the light guide plate, the limiting seat is fixedly connected to the middle part of the two sides of the installation cavity, the pressing plate is fixedly connected to the bottom surface of the back plate on both sides, the pressing plate is matched with the limiting seat, and the bottom of the pressing plate is in contact with the upper end of the two side walls of the light guide plate.

[0007] Further, the inner cavity of the two limiting seats is provided with a movable groove, the movable groove is provided with a buffer spring, the top of the buffer spring is fixedly connected with a movable plate, and the movable plate is movably arranged in the movable groove.

[0008] Further, the fastening mechanism comprises a locking seat, a slot, a mounting hole and a locking rod, four corners of the mounting cavity are fixedly connected with the locking seat, the locking seat is provided with the slot, four corners of the upper surface of the back plate are provided with the mounting hole for slidingly connecting the locking rod, and the top of the locking rod extends into the slot.

[0009] Further, the inner cavity of the slot is provided with an internal thread, the outer wall of the locking rod is provided with an external thread, and the external thread on the locking rod is slidably arranged with the internal thread formed in the slot.

[0010] Further, the upper surface of the limiting seat is provided with a groove matched with the pressing plate, and the movable groove is arranged at the middle position of the surface of the groove.

[0011] Further, the two side walls of the shell are provided with a through groove, and the back plate and the inner side wall of the shell are both provided with a layer of buffer pad.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The utility model discloses a positioning column and a positioning groove are matched, the light guide plate can be positioned accurately in the mounting cavity, the position is stable in the working process, and the light guide plate cannot be deviated due to external force and other factors, so that the uniformity and stability of the backlight are guaranteed, the display effect is improved, the buffer spring and the movable plate structure in the limiting seat are used when the device is impacted or vibrated by external force, such as bumping or accidental collision in the transportation process, the buffer spring can absorb and buffer the external force, reduce the damage to the light guide plate and other internal components, reduce the probability of component damage, displacement and other faults caused by impact, and prolong the service life of the device.

[0014] 2. The utility model discloses that the locking seat, the slot, the mounting hole and the locking rod are matched, especially through the threaded connection, the back plate and the shell can be tightly fixed together, the back plate is prevented from loosening, shaking or falling off due to various reasons in the use process, the stability of the whole backlight device structure is guaranteed, and then the normal work of the liquid crystal display screen is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings are used to provide further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model.

[0016] Fig. 1 It is the appearance structure schematic view of the utility model;

[0017] Fig. 2 It is the limiting buffer mechanism structure schematic view of the utility model;

[0018] Fig. 3The fastening mechanism structure analysis diagram of the utility model;

[0019] Fig. 4 The positioning column and light guide plate combined structure top view of the utility model.

[0020] In the drawing: 1, shell; 2, back plate; 3, limiting buffer mechanism; 301, light guide plate; 302, positioning groove; 303, positioning column; 304, installation cavity; 305, limiting seat; 306, recess; 307, pressing plate; 308, movable slot; 309, buffer spring; 310, movable plate; 4, fastening mechanism; 401, locking seat; 402, slot; 403, locking rod; 404, mounting hole; 5, through slot. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Please refer to Figs. 1 to 4 The utility model provides a kind of technical scheme: the backlight device of liquid crystal display, including shell 1, the top of shell 1 is equipped with back plate 2, limiting buffer mechanism 3 is arranged between shell 1 and back plate 2, the inner cavity of shell 1 four corners is equipped with fastening mechanism 4;

[0023] Limiting buffer mechanism 3, including light guide plate 301, positioning groove 302, positioning column 303, installation cavity 304, limiting seat 305 and pressing plate 307, the inner cavity of shell 1 is equipped with installation cavity 304, the surface of installation cavity 304 is fixedly connected with a group of symmetrical positioning column 303, light guide plate 301 is arranged in installation cavity 304, positioning groove 302 matching with positioning column 303 is opened on light guide plate 301, limiting seat 305 is fixedly connected on the middle position of the two sides of installation cavity 304, the bottom surface of back plate 2 two sides is fixedly connected with pressing plate 307, pressing plate 307 is matched with limiting seat 305, and the bottom of pressing plate 307 is in contact with the upper end two sides wall of light guide plate 301;

[0024] Specifically, by the setting of shell 1, back plate 2, limiting buffer mechanism 3 and fastening mechanism 4, the basic framework of liquid crystal display backlight device is constructed, so that each component can work cooperatively, provides stable backlight support for liquid crystal display, ensures that light is uniformly and stably irradiated on liquid crystal panel, to realize good display effect.

[0025] The inner cavity of the limiting seat 305 is provided with a movable slot 308, the movable slot 308 is provided with a buffer spring 309, the top of the buffer spring 309 is fixedly connected with a movable plate 310, and the movable plate 310 is movably arranged in the movable slot 308;

[0026] Specifically, when the device is subjected to external impact or vibration, the movable plate 310 compresses the buffer spring 309 in the movable slot 308, the buffer spring 309 absorbs and consumes energy, reduces the impact force on the light guide plate 301 and other components, thereby protecting the structural integrity of the light guide plate 301 and the entire backlight device, prolonging the service life, and at the same time, helping to maintain the position accuracy of the light guide plate 301 and ensuring the stability of the backlight effect.

[0027] The fastening mechanism 4 includes a locking seat 401, a slot 402, a mounting hole 404 and a locking rod 403, the locking seat 401 is fixedly connected to the four corners of the mounting cavity 304, the slot 402 is arranged in the locking seat 401, the mounting hole 404 is arranged in the upper surface of the back plate 2 for sliding connection of the locking rod 403, and the top of the locking rod 403 extends into the slot 402;

[0028] Specifically, through the cooperation of the locking seat 401, the slot 402, the mounting hole 404 and the locking rod 403, reliable fastening connection between the back plate 2 and the shell 1 is realized, the structure of the entire backlight device is more stable, and loosening or displacement between the back plate 2 and the shell 1 during use is prevented, thereby ensuring normal work of the backlight device and stability of the display effect.

[0029] The inner cavity of the slot 402 is provided with an internal thread, the outer wall of the locking rod 403 is provided with an external thread, and the external thread on the locking rod 403 is slidably arranged with the internal thread formed in the slot 402;

[0030] Specifically, the internal thread in the slot 402 and the external thread on the outer wall of the locking rod 403 cooperate with each other, so that the connection of the locking rod 403 in the slot 402 is more compact and firm, the fastening effect between the back plate 2 and the shell 1 is further enhanced, and meanwhile, installation and disassembly are facilitated, and the backlight device is convenient for maintenance and replacement of parts.

[0031] The upper surface of the limiting seat 305 is provided with a groove 306 matched with the pressing plate 307, and the movable slot 308 is arranged at the middle position of the surface of the groove 306;

[0032] Specifically, the groove 306 is matched with the pressing plate 307, so that the pressing plate 307 can be more accurately positioned, and the pressing plate 307 can better cooperate with the limiting seat 305 to limit and fix the light guide plate 301; meanwhile, the groove 306 can also protect the pressing plate 307 to a certain extent, preventing the pressing plate 307 from being abraded or damaged during use.

[0033] Two side walls of the shell 1 are provided with through grooves 5, and the back plate 2 and the inner side wall of the shell 1 are both provided with a layer of buffer pad;

[0034] Specifically, the through grooves 5 are beneficial to air circulation, heat dissipation, reduction of heat generated by the backlight device during operation, and improvement of stability and reliability of the device; the buffer pad can play a buffering role between the back plate 2 and the shell 1, reduce friction and collision between the two, and also absorb vibration and noise to some extent, thereby improving user experience.

[0035] The working principle of the above embodiment is as follows: when the liquid crystal display works, the light source in the backlight device emits light, and the light enters the light guide plate 301. The light guide plate 301 uniformly guides the light to the display area of the liquid crystal display to provide uniform backlight for display. At the same time, the buffer pad between the shell 1 and the back plate 2 and the buffer spring 309 in the limiting seat 305 are in a normal compression or relaxation state, maintaining the stability and structural integrity of the device. If the liquid crystal display is impacted or vibrated by external force, first, the buffer pad between the shell 1 and the back plate 2 can absorb part of the impact force, reducing direct collision and friction between the shell 1 and the back plate 2. Secondly, the buffer spring 309 in the limiting seat 305 will further play a buffering role, and the movable plate 310 moves up and down in the movable groove 308, and the buffer spring 309 consumes the impact force by compression or relaxation, thereby protecting the light guide plate 301 and other internal components from damage and ensuring normal work of the backlight device.

[0036] Finally, it should be pointed out that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent substitutions for some technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. Backlight device for liquid crystal display screens, comprising a housing (1), characterized in that: The top of the shell (1) is provided with a back plate (2), and a limiting and buffering mechanism (3) is arranged between the shell (1) and the back plate (2); four corners of the inner cavity of the shell (1) are provided with fastening mechanisms (4). The limiting and buffering mechanism (3) comprises a light guide plate (301), a positioning groove (302), a positioning column (303), a mounting cavity (304), a limiting seat (305) and a pressing plate (307), the inner cavity of the shell (1) is provided with the mounting cavity (304), a group of symmetrical positioning columns (303) are fixedly connected to the surface of the mounting cavity (304), the mounting cavity (304) is provided with the light guide plate (301), the light guide plate (301) is provided with the positioning groove (302) matched with the positioning columns (303), the limiting seats (305) are fixedly connected to the middle positions of the two sides of the mounting cavity (304), the bottom surface of the back plate (2) is fixedly connected with the pressing plates (307), the pressing plates (307) are matched with the limiting seats (305), and the bottom of the pressing plate (307) is in abutment with the two side walls of the upper end of the light guide plate (301).

2. The backlight device for liquid crystal display according to claim 1, wherein: The inner cavities of the two limiting seats (305) are provided with movable grooves (308), the movable grooves (308) are provided with buffer springs (309), the top of the buffer spring (309) is fixedly connected with a movable plate (310), and the movable plate (310) is movably arranged in the movable groove (308).

3. The backlight device for liquid crystal display according to claim 1, wherein: The fastening mechanism (4) comprises a locking seat (401), a slot (402), a mounting hole (404) and a locking rod (403), the four corner positions of the mounting cavity (304) are fixedly connected with the locking seats (401), the locking seats (401) are provided with the slots (402), the upper surface of the back plate (2) is provided with the mounting holes (404) for slidingly connecting the locking rods (403), and the top of the locking rod (403) extends into the slot (402).

4. The backlight device for liquid crystal display according to claim 3, wherein: The inner cavity of the slot (402) is provided with an internal thread, the outer wall of the locking rod (403) is provided with an external thread, and the external thread on the locking rod (403) can be slidably arranged in the internal thread formed in the slot (402).

5. The backlight device for liquid crystal display according to claim 2, wherein: The upper surface of the limiting seat (305) is provided with a groove (306) matched with the pressing plate (307), and the movable groove (308) is arranged on the surface of the middle position of the groove (306).

6. The backlight device of claim 1, wherein: The two side walls of the shell (1) are provided with through grooves (5), and the inner side walls of the back plate (2) and the shell (1) are both provided with a layer of buffer pads.

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