Anti-falling backlight source

Abstract

The present application relates to the technical field of backlight, specifically relates to a kind of anti-falling backlight, including backboard, glue frame and optical film assembly, the optical film assembly is set in backboard, the glue frame includes the first bottom plate of hollow and the first side wall being set to the first bottom plate four around, the backboard includes the second bottom plate and the second side wall being set to the second bottom plate four around, the first bottom plate is provided with several first threaded holes, the second bottom plate is provided with several second threaded holes with first threaded hole intercommunication, the first threaded hole and second threaded hole are provided with screw.The present application is fixed by thread, replaces the existing clamping structure or adhesive structure as main fixing mode, and connection is stronger, and installation is firm and reliable, and simple structure, easy to industrial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of backlight, in particular to a kind of anti-falling backlight. BACKGROUND

[0002] Backlight is mainly composed of light source, light guide plate, optical module and structural components, structural components include: back plate (iron back plate, aluminum back plate, plastic back plate), glue frame, lamp holder, aluminum profile, aluminum base strip, wherein back plate and glue frame are essential components, other structural components are not completely used.The fixed connection between back plate and glue frame is generally realized by simple clamping structure or adhesive structure at present, and the connection structure is not stable, and the phenomenon of loose and falling is prone to occur. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide an anti-falling backlight.

[0004] The purpose of the present application is realized by the following technical scheme:

[0005] An anti-falling backlight includes a back plate, a glue frame and an optical film assembly, the optical film assembly is arranged in the back plate, the back plate includes a first bottom plate and a first side wall arranged around the first bottom plate, the glue frame includes a hollow second bottom plate and a second side wall arranged around the second bottom plate, the first bottom plate is provided with a plurality of first threaded holes, the second bottom plate is provided with a plurality of second threaded holes communicated with the first threaded holes, and the first threaded holes and the second threaded holes are provided with screws.

[0006] Among them, the first side wall is outwardly provided with a plurality of protrusions, the second side wall is provided with a plurality of grooves corresponding to the positions of the protrusions, and the protrusions are clamped in the grooves.

[0007] Among them, the bottom of the first bottom plate is downwardly provided with a plurality of bosses, the first threaded holes are arranged in the bosses, and the first threaded holes are blind holes.

[0008] Among them, the second threaded hole is a countersunk hole.

[0009] Among them, the first side wall is provided with a clamping groove for positioning the optical film assembly.

[0010] Among them, the back plate is an aluminum alloy back plate.

[0011] Among them, the glue frame is a polycarbonate / glass fiber composite glue frame.

[0012] Further preferably, the glue frame is prepared by the following steps:

[0013] (1) Carbon fiber amination: take deionized water, amine, condensing agent and nanometer carbon fiber, mix them in the ratio of 100 mL: 10-14 g: 1-2 g: 0.2-0.4 g, stir for 10-14 h, then perform suction filtration, drying and washing to obtain aminated carbon fiber;

[0014] (2) Preparation of fiber assembly: take diisocyanate and polycarbonate diol in the molar ratio of 1:0.8-0.9, heat diisocyanate and polycarbonate diol to 60-80℃ respectively, then add polycarbonate diol to diisocyanate, keep warm for 1-3 h, then add aminated carbon fiber and deionized water, the ratio of diisocyanate, aminated carbon fiber and deionized water is 10-16 g: 5-7 g: 100 mL, stir for 20-40 min at 50-70℃, then add 7-9 times the mass of glass fiber of aminated carbon fiber, stir and disperse, then filter, wash and dry to obtain the fiber assembly;

[0015] (3) Granulation: prepare materials in the following mass percentage: polycarbonate 75-82.5%, fiber assembly 13-15%, toughening agent 1-3%, flame retardant 3-6%, and auxiliary agent 0.5-1%, disperse polycarbonate, toughening agent, flame retardant and auxiliary agent, then feed them from the main feeding port of the twin-screw extruder, feed the fiber assembly from the side feeding port of the twin-screw extruder, extrude and granulate, set seven temperature zones for the twin-screw extruder, the temperatures are 260-265℃, 265-270℃, 270-275℃, 275-280℃, 280-290℃, 280-285℃ and 275-280℃ respectively, the feeding position of the side feeding port is the second temperature zone;

[0016] (4) Molding: inject mold the blend particles obtained in step (3) to obtain the rubber frame.

[0017] It is an industry consensus that the addition of glass fibers to polycarbonate can significantly improve the rigidity of the blended material, but also reduces the toughness and flowability of the blended material. Based on the nano size effect, a small amount of carbon nanofiber can not only significantly improve the tensile strength, bending strength and other rigidity of polycarbonate, but also has obvious help to the impact resistance and other toughness. However, like glass fiber, it also reduces the flowability of the composite material and the processing performance. Generally speaking, glass fiber and nanometer carbon fiber are added selectively because the two are redundant in rigidity performance and can be replaced by each other. Although nanometer carbon fiber can appropriately improve the toughness, it cannot replace the role of the toughening agent, and the combination of the two does not have a multiplying effect. Therefore, the selection of addition is a subtraction problem, and the selective addition can save the cost of gradient experiment and improve the economic benefit. The amino group of the amine substance is used to modify the nanometer carbon fiber, and then the amino group reacts with the -NCO of the polyurethane synthesized by diisocyanate and polycarbonate diol, so as to introduce the nanometer carbon fiber into the molecular chain structure of the polyurethane through chain extension reaction, improve the compatibility and dispersibility of the nanometer carbon fiber, and more favorably improve the mechanical properties. Polycarbonate diol is also selected to improve the compatibility of the nanometer carbon fiber and polycarbonate. At the same time, glass fiber is also added for reinforcement. However, since the content of glass fiber is relatively high compared with carbon fiber, the glass fiber is not modified by silane coupling agent or polymer coating modification. The modified nanometer carbon fiber is dispersed between the glass fibers by liquid phase mixing. Compared with solid phase mixing, liquid phase mixing can reduce the shearing effect on the glass fiber, and the mixing and dispersion effect is also good. In the fiber combination, the polyurethane of the modified nanometer carbon fiber acts as an elastomer to play a lubricating role, improve the flowability of the glass fiber, and improve the dispersibility of the glass fiber in the polycarbonate, so as to play a multiplying effect. Compared with direct blending, the mechanical properties of the blend can be more significantly improved to meet the use requirements of the backlight frame. In addition, the working temperature of the screw extrusion and the position of the side feeding port are also very important. Feeding from the main feeding port can easily cause excessive shearing of the fiber combination, and the fibers in the polymer rearrange and agglomerate, thereby reducing the mechanical properties of the blend. The side feeding port is arranged at the position of the post section, which can easily cause insufficient dispersion time of the fiber combination, and cannot form a good dispersion structure, which also reduces the mechanical properties.

[0018] The amine substance is ethylenediamine, and the condensing agent is N,N'-diisopropyl carbodiimide.

[0019] The diisocyanate is one or more of toluene diisocyanate, diphenyl methane diisocyanate and isophorone diisocyanate.

[0020] The polycarbonate diol is polyhexamethylene carbonate diol.

[0021] The nanometer carbon fiber has a diameter of 150-200 nm and a length of 10-20 μm.

[0022] The catalyst is an organic tin catalyst.

[0023] The glass fiber has a single filament diameter of 8-10 μm and a length of 2-5 mm.

[0024] The polycarbonate is bisphenol A polycarbonate, the toughening agent is one or more of ABS, MBS and LCP, and the flame retardant is one or more of magnesium hydroxide and aluminum hydroxide.

[0025] The auxiliary agent includes 0.2-0.4% lubricant, 0.1-0.3% antioxidant and 0.1-0.3% light stabilizer.

[0026] The present application has the advantages that the present application replaces the existing clamping structure or back adhesive structure as the main fixing mode through thread fixing, has stronger connection stability, is firm and reliable in installation, and has simple structure and easy industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional view of the present application;

[0028] The reference signs are: 1-back plate, 11-first bottom plate, 111-first threaded hole, 112-boss, 12-first side wall, 121-bump, 122-clamping groove, 2-glue frame, 21-second bottom plate, 211-second threaded hole, 22-second side wall, 221-groove, 3-optical film assembly, 4-screw. DETAILED DESCRIPTION

[0029] For the convenience of those skilled in the art, the following embodiments and accompanying drawings are combined to facilitate understanding. Figure 1 The present application is further described, and the content mentioned in the embodiments is not a limitation of the present application.

[0030] Example 1

[0031] The application discloses a kind of anti-falling backlight source, including backboard 1, glue frame 2 and optical film assembly 3, the optical film assembly 3 is arranged in backboard 1, the backboard 1 includes first bottom plate 11 and the first side wall 12 being arranged around first bottom plate 11, the glue frame 2 includes hollow second bottom plate 21 and the second side wall 22 being arranged around second bottom plate 21, the first bottom plate 11 is provided with a plurality of first threaded holes 111, the second bottom plate 21 is provided with a plurality of second threaded holes 211 communicated with first threaded holes 111, and the first threaded hole 111 and the second threaded hole 211 are provided with screw 4.

[0032] Among them, the first side wall 12 is outwardly provided with a plurality of bosses 121, the second side wall 22 is provided with a plurality of grooves 221 corresponding to the positions of the bosses 121, and the bosses 121 are clamped in the grooves 221.

[0033] Among them, the bottom of the first bottom plate 11 is downwardly provided with a plurality of bosses 112, and the first threaded holes 111 are arranged in the bosses 112.

[0034] Among them, the second threaded hole 211 is a countersunk hole.

[0035] Among them, the first side wall 12 is provided with a clamping groove 122 for positioning the optical film assembly 3.

[0036] Among them, the backboard 1 is an aluminum alloy backboard 1.

[0037] Among them, the glue frame 2 is a polycarbonate / glass fiber composite material glue frame 2.

[0038] Embodiment 2

[0039] Further embodiments of the present embodiment and embodiment 1:

[0040] The glue frame 2 is prepared by the following steps:

[0041] (1) Carbon fiber amination: take deionized water, amine, condensing agent and nanometer carbon fiber, and mix them in the ratio of 100 mL:12 g:1.5 g:0.3 g, stir for 12 h, then perform suction filtration, drying and washing to obtain aminated carbon fiber;

[0042] (2) Preparation of the fiber assembly: the diisocyanate and polycarbonate diol are weighed according to the molar ratio of 1:0.85, the diisocyanate and polycarbonate diol are heated to 70℃ respectively, then the polycarbonate diol is added to the diisocyanate, and the reaction is kept for 2h, then the aminated carbon fiber and deionized water are added, the ratio of diisocyanate, aminated carbon fiber and deionized water is 13g:6g:100mL, after stirring at 60℃ for 30min, the glass fiber with 8 times the mass of the aminated carbon fiber is added for stirring and dispersion, then filtration, washing and drying are performed to obtain the fiber assembly;

[0043] (3) Granulation: the materials are prepared according to the following mass percentage: polycarbonate 78.75%, fiber assembly 14%, toughening agent 2%, flame retardant 4.5%, and auxiliary agent 0.75%, the polycarbonate, toughening agent, flame retardant and auxiliary agent are dispersed and then fed from the main feeding port of the twin-screw extruder, the fiber assembly is fed from the side feeding port of the twin-screw extruder, and extrusion granulation is performed, the twin-screw extruder is provided with seven temperature zones, and the temperatures are 263℃, 267℃, 272℃, 278℃, 285℃, 283℃ and 276℃ in sequence, and the feeding position of the side feeding port is the second temperature zone;

[0044] (4) Molding: the blend particles obtained in step (3) are subjected to injection molding to obtain the rubber frame 2.

[0045] The amine is ethylenediamine, and the condensing agent is N,N'-diisopropyl carbodiimide.

[0046] The diisocyanate is toluene diisocyanate.

[0047] The polycarbonate diol is polyhexamethylene carbonate diol.

[0048] The nanometer carbon fiber has a diameter of 175nm and a length of 15μm.

[0049] The catalyst is an organic tin catalyst.

[0050] The glass fiber has a single-fiber diameter of 9μm and a length of 3.5mm.

[0051] The polycarbonate is bisphenol A polycarbonate, the toughening agent is ABS, and the flame retardant is magnesium hydroxide.

[0052] The auxiliary agent includes 0.3% of a lubricant, 0.2% of an antioxidant and 0.2% of a light stabilizer.

[0053] Example 3

[0054] The difference between this embodiment and example 2 is that:

[0055] The glue frame 2 is prepared by the following steps:

[0056] (1) Carbon fiber amination: take deionized water, amine, condensing agent and nanometer carbon fiber, mix them in the ratio of 100 mL:10 g:1 g:0.2 g, stir for 10 h, then perform suction filtration, drying and washing to obtain aminated carbon fiber;

[0057] (2) Preparation of fiber assembly: take diisocyanate and polycarbonate diol in the molar ratio of 1:0.8, heat the diisocyanate and polycarbonate diol to 6℃ respectively, then add the polycarbonate diol to the diisocyanate, incubate for 1 h, then add aminated carbon fiber and deionized water, the ratio of diisocyanate, aminated carbon fiber and deionized water is 10 g:5 g:100 mL, after stirring for 20 min at 50-70℃, add 7 times the mass of glass fiber of the aminated carbon fiber to stir and disperse, then filter, wash and dry to obtain the fiber assembly;

[0058] (3) Granulation: prepare materials in the following mass percentage: polycarbonate 75%, fiber assembly 15%, toughening agent 3%, flame retardant 6%, and auxiliary agent 1%, disperse the polycarbonate, toughening agent, flame retardant and auxiliary agent, then put them into the main feeding port of the twin-screw extruder, put the fiber assembly into the side feeding port of the twin-screw extruder, and extrude and granulate, the twin-screw extruder is provided with seven temperature zones, the temperatures are 265℃, 270℃, 275℃, 280℃, 290℃, 285℃ and 280℃ in turn, and the input position of the side feeding port is the second temperature zone;

[0059] (4) Molding: perform injection molding on the blend particles obtained in step (3) to obtain the glue frame 2.

[0060] The amine is ethylenediamine, and the condensing agent is N,N'-diisopropyl carbodiimide.

[0061] The diisocyanate is diphenyl methane diisocyanate.

[0062] The polycarbonate diol is polyhexamethylene carbonate diol.

[0063] The nanometer carbon fiber has a diameter of 150 nm and a length of 10 μm.

[0064] The catalyst is an organic tin catalyst.

[0065] The glass fiber has a single filament diameter of 8 μm and a length of 2 mm.

[0066] The polycarbonate is bisphenol A type polycarbonate, the toughening agent is MBS, and the flame retardant is aluminum hydroxide.

[0067] The auxiliary agent includes 0.4% lubricant, 0.3% antioxidant and 0.3% light stabilizer.

[0068] Example 4

[0069] The difference between the embodiment and example 2 is that:

[0070] The glue frame 2 is prepared by the following steps:

[0071] (1) Carbon fiber amination: take deionized water, amine, condensing agent and nanometer carbon fiber, and mix them in the ratio of 100 mL:14 g:2 g:0.4 g, stir for 14 h, then perform suction filtration, drying and washing to obtain aminated carbon fiber;

[0072] (2) Preparation of fiber assembly: take diisocyanate and polycarbonate diol in the molar ratio of 1:0.9, heat the diisocyanate and polycarbonate diol to 80℃ respectively, then add the polycarbonate diol to the diisocyanate, and keep the reaction for 3 h, then add aminated carbon fiber and deionized water, the ratio of diisocyanate, aminated carbon fiber and deionized water is 16 g:7 g:100 mL, after stirring at 70℃ for 40 min, add glass fiber 9 times the mass of the aminated carbon fiber for stirring and dispersion, then filter, wash and dry to obtain the fiber assembly;

[0073] (3) Granulation: prepare materials in the following mass percentages: polycarbonate 82.5%, fiber assembly 13%, toughening agent 1%, flame retardant 3%, and auxiliary agent 0.5%, after dispersing the polycarbonate, toughening agent, flame retardant and auxiliary agent, put them into the main feeding port of the twin-screw extruder, put the fiber assembly into the side feeding port of the twin-screw extruder, and perform extrusion granulation, the twin-screw extruder is provided with seven temperature zones, and the temperatures are 260℃, 265℃, 270℃, 275℃, 280℃, 280℃ and 275℃ in sequence, and the input position of the side feeding port is the second temperature zone;

[0074] (4) Molding: perform injection molding on the blend particles obtained in step (3) to obtain the glue frame 2.

[0075] The amine is ethylenediamine, and the condensing agent is N,N'-diisopropyl carbodiimide.

[0076] The diisocyanate is one or more of isophorone diisocyanate.

[0077] The polycarbonate diol is polyhexamethylene carbonate diol.

[0078] wherein the nanometer carbon fiber has a diameter of 200 nm and a length of 20 μm.

[0079] wherein the catalyst is an organic tin catalyst.

[0080] wherein the glass fiber has a single fiber diameter of 10 μm and a length of 5 mm.

[0081] wherein the polycarbonate is a bisphenol A type polycarbonate, the toughening agent is LCP, and the flame retardant is magnesium hydroxide.

[0082] wherein the auxiliary agent comprises 0.4% lubricant, 0.3% antioxidant, and 0.3% light stabilizer.

[0083] Comparative Example 1

[0084] The difference between this comparative example and Example 2 is that:

[0085] The glue frame 2 of this comparative example is prepared by the following steps:

[0086] (1) Granulation: the following mass percentages are prepared: polycarbonate 76.8%, glass fiber 14%, toughening agent 3%, flame retardant 4.5%, and auxiliary agent 0.7%. The polycarbonate, toughening agent, flame retardant, and auxiliary agent are dispersed and then fed from the main feeding port of the twin-screw extruder, and the glass fiber is fed from the side feeding port of the twin-screw extruder. The extrusion granulation is performed, and the twin-screw extruder is provided with seven temperature zones with temperatures of 263°C, 267°C, 272°C, 278°C, 285°C, 283°C, and 276°C in sequence, and the feeding position of the side feeding port is the second temperature zone.

[0087] (2) Molding: the blend particles obtained in step (1) are injection molded to obtain the glue frame 2.

[0088] Comparative Example 2

[0089] The difference between this comparative example and Example 2 is that:

[0090] The glue frame 2 of this comparative example is prepared by the following steps:

[0091] (1) Aminoization of carbon fiber: deionized water, amine substance, condensing agent, and nanometer carbon fiber are mixed in a ratio of 100 mL: 12 g: 1.5 g: 0.3 g, stirred for 12 h, and then subjected to suction filtration, drying, and washing to obtain aminoized carbon fiber.

[0092] (2) Granulation: raw materials are prepared according to the following mass percentages: polycarbonate 78.75%, amino carbon fiber 2%, glass fiber 12%, toughening agent 2%, flame retardant 4.5%, and auxiliary agent 0.75%. The polycarbonate, amino carbon fiber, toughening agent, flame retardant, and auxiliary agent are dispersed and then fed from the main feeding port of the twin-screw extruder. The glass fiber is fed from the side feeding port of the twin-screw extruder. Extrusion granulation is performed. The twin-screw extruder is provided with seven temperature zones, and the temperatures are 263°C, 267°C, 272°C, 278°C, 285°C, 283°C, and 276°C in sequence. The feeding position of the side feeding port is the second temperature zone.

[0093] (4) Molding: the blend particles obtained in step (3) are subjected to injection molding to obtain the rubber frame 2.

[0094] The blend particles of Example 2, Comparative Example 1, and Comparative Example 2 are used to prepare test samples according to the ASTM standard. The tensile strength, flexural strength, and Izod notched impact strength are tested according to ASTM D638, ASTM D790, and ASTM D256. The test results are as follows:

[0095] Example 1 Comparative Example 1 Comparative Example 2 Tensile strength (MPa) 91 81 87 Flexural strength (MPa) 126 112 119 Izod notched impact strength (kJ / m 2 ) 13.6 11.9 12.5

[0096] The above embodiments are preferred implementation schemes of the present application. In addition to the above, the present application can also be implemented in other ways. Any obvious substitutions without departing from the concept of the present application are within the protection scope of the present application.

Claims

1. A fall-preventing backlight, characterized by: The backboard, the rubber frame and the optical film assembly, the optical film assembly is arranged in the backboard, the backboard includes the first bottom plate and the first side wall arranged around the first bottom plate, the rubber frame includes the hollow second bottom plate and the second side wall arranged around the second bottom plate, the first bottom plate is provided with a plurality of first threaded holes, the second bottom plate is provided with a plurality of second threaded holes communicated with the first threaded holes, the first threaded hole and the second threaded hole are provided with screws; Wherein, the first side wall is outwardly provided with a plurality of protrusions, the second side wall is provided with a plurality of grooves corresponding to the position of the protrusions, the protrusions are clamped in the grooves, and the first side wall is provided with a clamping groove for positioning the optical film assembly; Wherein, the rubber frame is a polycarbonate / glass fiber composite material frame, and the rubber frame is prepared by the following steps: (1) Aminoization of carbon fiber: take deionized water, amine, condensing agent and nanometer carbon fiber and mix them in a ratio of 100 mL:10-14 g:1-2 g:0.2-0.4 g, stir for 10-14 h, then perform suction filtration, drying and washing to obtain aminoized carbon fiber; (2) Preparation of fiber assembly: take diisocyanate and polycarbonate diol in a molar ratio of 1:0.8-0.9, heat the diisocyanate and polycarbonate diol to 60-80℃ respectively, then add the polycarbonate diol to the diisocyanate, and keep warm for 1-3 h, then add aminoized carbon fiber and deionized water, the ratio of diisocyanate, aminoized carbon fiber and deionized water is 10-16 g:5-7 g:100 mL, after stirring at 50-70℃ for 20-40 min, add 7-9 times the mass of glass fiber of the aminoized carbon fiber for stirring and dispersion, then filter, wash and dry to obtain the fiber assembly; (3) Granulation: prepare materials in the following mass percentages: polycarbonate 75-82.5%, fiber assembly 13-15%, toughening agent 1-3%, flame retardant 3-6%, and auxiliary agent 0.5-1%, disperse the polycarbonate, toughening agent, flame retardant and auxiliary agent, then put them into the main feeding port of the twin-screw extruder, put the fiber assembly into the side feeding port of the twin-screw extruder, and extrude and granulate, the twin-screw extruder is provided with seven temperature zones, and the temperatures are 260-265℃, 265-270℃, 270-275℃, 275-280℃, 280-290℃, 280-285℃ and 275-280℃ in sequence, and the side feeding port is located at the second temperature zone; (4) Molding: the blended granules obtained in step (3) are injection molded to obtain the rubber frame.

2. The anti-drop backlight of claim 1, wherein: The bottom of the first bottom plate is downwardly provided with a plurality of protrusions, and the first threaded holes are arranged in the protrusions, and the first threaded holes are blind holes.

3. The anti-drop backlight of claim 1, wherein: The second threaded hole is a countersunk hole.

4. The anti-drop backlight of claim 1, wherein: The backboard is an aluminum alloy backboard.

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