CN205720996U - The lamp bar mounting structure of straight-down negative display device - Google Patents

Abstract

This utility model is applicable to field of display devices, disclose the lamp bar mounting structure of straight-down negative display device, it backboard including there is cavity and several be spaced the lamp bar that is installed in cavity, be convexly equipped with the support rod for supporting lamp bar in cavity and several be for respectively by each lamp bar spring fastening buckle structure on support rod.In this utility model, lamp bar realizes fixing on support rod by buckle structure spring fastening, lamp bar can freely be stretched in the longitudinal direction, so, when product is under high and low temperature environment, the lamp bar caused by material difference between lamp bar and backboard and the backboard asynchrony phenomenon that expands with heat and contract with cold will not cause lamp bar the bad phenomenon tilting, arching upward occur further, improves the reliability of product；And when, after product at normal temperatures operational stoppage, lamp bar shrinks and interiors of products can be made the most again to produce the noise of crack in Pi with the asynchronous of backboard contraction, improves user and uses the comfortableness of product.

Description

The lamp bar mounting structure of straight-down negative display device

Technical field

This utility model belongs to field of display devices, particularly relates to the lamp bar mounting structure of straight-down negative display device.

Background technology

At present, the backlight mode of LCD TV is broadly divided into side-light type and backlight type, wherein, the principle of side-light backlight is that luminous lamp strip is arranged on upper and lower side or the left and right side of backlight module, then the light sent lamp bar by light guide plate is guided, so that light can uniformly, vertically project the back side of LCDs, liquid crystal molecule is driven to realize liquid crystal imaging by mainboard again after LCDs obtains uniform backlight；And the principle of direct-type backlight is luminous lamp strip to be lined up one group of Direct Uniform be fixed on the back side of backlight module, so that the LED of luminescence is lined up matrix form and is perpendicular to LCDs luminescence, and by optical diffusing plate and diffusion barrier, light is uniformly projected the back side of LCDs, after LCDs obtains uniform backlight, realize liquid crystal imaging by mainboard driving liquid crystal molecule again.

In prior art, the fixed form of down straight aphototropism mode set lamp bar generally uses bonding way be fixed on backboard or use screw connecting mode to be fixed on backboard.But, owing to the material of lamp bar substrate is generally aluminium sheet or phenolic resin plate, the material of backboard is generally plastic cement or galvanizing steel plate, therefore, either adhering fixed mode or screw connection fixed form, lamp bar and the problem of backboard systolic dyssynchrony when all can run into high/low temperature.Especially for product for producing under room temperature (20 degrees centigrade), work under-10 degrees Celsius of environment or during storage under-20 degrees Celsius of environment, lamp strip adoption bonding way is it would appear that lamp bar gum comes off, the bad phenomenon of lamp bar tilting；Then there will be lamp bar local in lamp strip adoption lock screw fixation method to arch upward and expendable bad phenomenon, these bad phenomenon are especially apparent when backboard material is plastic cement.In addition, even if LCD TV is the operation that works under normal temperature environment, it the most also there is a problem that owing to can adjoint generate heat during lamp bar luminescence, therefore, in the operation of product, lamp bar can slowly expand elongated, and the temperature of lamp bar will lower rapidly when product is out of service, now, lamp bar can shrink and shorten, and in the contraction process of lamp bar, relative movement can occur between lamp bar and backboard, screw, so that product sends the noise of crack in Pi, have a strong impact on user and used the comfortableness of product.

Utility model content

The purpose of this utility model is to overcome at least one weak point of above-mentioned prior art; provide the lamp bar mounting structure of straight-down negative display device; which solve lamp strip adoption screw connecting mode or bonding way in existing straight-down negative display device to be fixed on backboard when high/low temperature the problem that lamp bar arches upward or tilts occurs, and the problem that when solving that in existing straight-down negative display device, lamp strip adoption screw connecting mode is shut down under room temperature working condition, interiors of products produces abnormal sound.

For reaching above-mentioned purpose, the technical solution adopted in the utility model is: the lamp bar mounting structure of straight-down negative display device, including there is the backboard of cavity and several are spaced the lamp bar being installed in described cavity, being convexly equipped with the support rod for supporting described lamp bar in described cavity and several are for respectively by each described lamp bar spring fastening buckle structure on described support rod.

Alternatively, each described buckle structure include two end anchors being respectively used to withhold described lamp bar both ends and at least one described in two between end anchors for the middle buckle of the middle part withholding described lamp bar.

Alternatively, described end anchors and described middle buckle all include being vertically arranged for limiting the described lamp bar vertically extending part moving horizontally displacement in described cavity and from the bending horizontal expansion of described vertically extending operative tip for the lateral extension portions limiting the described lamp bar vertical moving displacement in described cavity.

Alternatively, described lateral extension portions includes the empty avoiding portion that guide part is connected and the attaching part being connected between described empty avoiding portion and described guide part with described vertical extension, described attaching part the most described empty avoiding portion and described guide part are downwardly concaved setting, and described guide part tilts setting obliquely from the end away from described attaching part of described attaching part.

Alternatively, described support rod is also convexly equipped with several Horizontal limiting ribs, each described Horizontal limiting rib and each described vertically extending part and from the two opposite sides of described lamp bar, described lamp bar is carried out Horizontal limiting respectively.

Alternatively, the side back to described middle buckle of each described end anchors extends on the medial wall of this end anchors close being fixedly connected on described cavity, and the both sides towards end anchors described in two of each described middle buckle are unsettled setting.

Alternatively, the rear lateral portion of described backboard is provided with at least one hollow hole arranged with described middle buckle para-position, and the side, described middle buckle both sides arranged with described hollow hole para-position is also convexly equipped with two little cam.

Alternatively, also it is convexly equipped with in described cavity for described lamp bar is guided installation and the guide stop block of pre-determined bit.

Alternatively, the sidepiece of described lamp bar is provided with open pore, being convexly equipped with in described cavity and close for limiting the locating dowel that described lamp bar moves along its length with described open pore card inserting, described open pore is arranged along the length direction of described lamp bar near the centre position of described lamp bar.

Alternatively, in described cavity, be additionally provided with several projections, described lamp bar runs through be provided with several respectively with the spacing hole of each described projection matched in clearance.

The lamp bar mounting structure of the straight-down negative display device that this utility model provides, it is supported lamp bar by arranging support rod in the cavity of backboard, and buckle structure is set in cavity lamp bar is locked on support rod, thus effectively achieve the installation on backboard of the lamp bar and fix.Owing to lamp bar realizes fixing on support rod by buckle structure spring fastening, therefore, lamp bar can freely be stretched in the longitudinal direction, so, when product is under high and low temperature environment, the lamp bar caused by material difference between lamp bar and backboard and the backboard asynchrony phenomenon that expands with heat and contract with cold will not cause lamp bar the bad phenomenon tilting, arching upward occur further, inherently solve owing to lamp bar and backboard expand with heat and contract with cold the asynchronous problem causing lamp bar to tilt, arch upward, improve the reliability of product；And when after product at normal temperatures operational stoppage; lamp bar shrinks and interiors of products can be made the most again to produce the noise of crack in Pi with the asynchronous of backboard contraction; cause occurring saltatory to slide between lamp bar, screw, mesochite and then producing the problem of bad noise at interiors of products due to material systolic dyssynchrony after inherently solving product operational stoppage at normal temperatures, be effectively increased user's experience effect to product.In addition, for lamp strip adoption snap fit arrangement is relative to screw mounting means and bonding mounting means, it is simpler, convenient that it installs operation, improve the production efficiency of product dramatically, and effectively reduce the cost of raw material (especially with respect to the scheme of lamp strip adoption bonding way) of product, thus it is more conducive to improve the competitiveness of product in market.

Accompanying drawing explanation

Fig. 1 is the decomposing schematic representation of the straight-down negative display device that this utility model embodiment provides；

Fig. 2 is the lamp bar assembling schematic top plan view with backboard of this utility model embodiment offer；

Fig. 3 is the generalized section of A-A in Fig. 2；

Fig. 4 is the generalized section of B-B in Fig. 2；

Fig. 5 is the generalized section of C-C in Fig. 2；

Fig. 6 is the structural representation of the backboard that this utility model embodiment provides；

Fig. 7 is the close-up schematic view in Fig. 6 at D；

Fig. 8 is the close-up schematic view in Fig. 6 at E；

Fig. 9 is the structural representation of the lamp bar that this utility model embodiment provides.

Detailed description of the invention

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.

It should be noted that when element is referred to as on " being fixed on " or " being arranged at " another element, it can be directly on another element or may be simultaneously present centering elements.When an element is known as " connection " another element, and it can be to be directly connected to another element or may be simultaneously present centering elements.

Also, it should be noted the orientation term such as left and right, upper and lower, top in following example, end, it is only relative concept or with the normal operating condition of product as reference each other, and should not be regarded as restrictive.

As shown in figs 1-9, the lamp bar mounting structure of the straight-down negative display device that this utility model embodiment provides, including there is the backboard 1 of cavity 10 and several are spaced the lamp bar 2 being installed in cavity 10, being convexly equipped with the support rod 11 for supporting lamp bar 2 in cavity 10 and several are for respectively by each lamp bar 2 spring fastening buckle structure 12 on support rod 11.The lamp bar mounting structure of the straight-down negative display device that this utility model embodiment provides, it is supported lamp bar 2 by arranging support rod 11 in the cavity 10 of backboard 1, and buckle structure 12 is set in cavity 10 lamp bar 2 is locked on support rod 11, thus effectively achieve the lamp bar 2 installation on backboard 1 and fix.Owing to lamp bar 2 realizes fixing on support rod 11 by buckle structure 12 spring fastening, therefore, lamp bar 2 can freely be stretched in the longitudinal direction, so, when product is under high and low temperature environment, the lamp bar 2 caused by material difference between lamp bar 2 and backboard 1 and backboard 1 asynchrony phenomenon that expands with heat and contract with cold will not cause lamp bar 2 bad phenomenon tilting, arching upward occur further, fundamentally solves owing to lamp bar 2 and backboard 1 expand with heat and contract with cold the asynchronous problem causing lamp bar 2 to tilt, arch upward；And when after product at normal temperatures operational stoppage; lamp bar 2 shrinks and interiors of products can be made the most again to produce the noise of crack in Pi with the asynchronous of backboard 1 contraction; cause occurring saltatory to slide between lamp bar 2, screw, mesochite and then producing the problem of bad noise at interiors of products due to material systolic dyssynchrony after fundamentally solving product operational stoppage at normal temperatures, be effectively increased user's experience effect to product.In addition, the mode of snapping connection can hand operation complete, for its relative screw connecting mode and bonding way, operation is installed simpler, convenient, improve the production efficiency of product dramatically, and effectively reduce the cost of raw material (using the scheme of bonding way especially with respect to lamp bar 2) of product, thus it is more conducive to improve the competitiveness of product in market.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 2, Fig. 6, Fig. 7 and Fig. 8, each buckle structure 12 include two end anchors 121 being respectively used to withhold lamp bar 2 both ends and at least one between both ends buckle 121 for the middle buckle 122 of the middle part withholding lamp bar 2.Each end anchors 121 in same buckle structure 12 and each middle buckle 122 are spaced distribution along the length direction of lamp bar 2, so, lamp bar 2 can be made to have multiple stress point along its length, thus be beneficial to ensure the solid and reliable property that lamp bar 2 is installed.

Preferably, in the lump with reference to shown in Fig. 1-3, the middle part of lamp bar 2 is (on lamp bar 2 except both ends Position) there is several supporting parts being supported on support rod 11, and the both ends of lamp bar 2 are that cantilevered is placed, i.e. the both ends of lamp bar 2 are not supported on support rod 11, and support rod 11 does not extend the position immediately below lamp bar 2 both ends.Herein, use support rod 11 that the middle part of lamp bar 2 is supported, and to make the both ends of lamp bar 2 be that cantilevered is placed, so, both it is beneficial to ensure the support rod 11 support reliability to lamp bar 2, is beneficial to again reduce lamp bar 2 and is installed on the difficulty between support rod 11 and buckle structure 12.

Preferably, in the lump with reference to Fig. 1, Fig. 2, Fig. 5, Fig. 6, shown in Fig. 7 and Fig. 8, the side back to middle buckle 122 of each end anchors 121 extends on the medial wall of this end anchors 121 close being fixedly connected on cavity 10, the both sides towards both ends buckle 121 of each middle buckle 122 are unsettled setting, so, make end anchors 121 in the vertical direction almost without elasticity, and centre buckle 122 has preferable elasticity at vertical direction, thus both can ensure the solid and reliable property that lamp bar 2 is installed in cavity 10, ensure that the convenience that lamp bar 2 dismounts.Specifically, owing to the both ends of lamp bar 2 are that cantilevered is arranged, the i.e. both ends of lamp bar 2 have certain elastic deformation space at vertical direction, therefore, during lamp bar 2 is installed, the end of lamp bar 2 can be made to slip into by the deformation of lamp bar 2 end and be installed on the lower section of end anchors 121, it need not to be set to end anchors 121 to have and elastic also can realize end anchors 121 and coordinate with the assembling of lamp bar 2 end, and end anchors 121 is set to not have elasticity, it is beneficial to the manufacture molding of end anchors 121, and is beneficial to improve the solid and reliable property that lamp bar 2 is installed；And the middle part of lamp bar 2 causes its in the vertical direction almost without elastic deformation space due to the spacing of rib 11 supported, therefore, during lamp bar 2 is installed, need to be made the middle part of lamp bar 2 slip into the lower section being installed on middle buckle 122 by the deformation of middle buckle 122.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 3, Fig. 6, Fig. 7 and Fig. 8, end anchors 121 and middle buckle 122 all include being vertically arranged for limiting the lamp bar 2 vertically extending part 1201 moving horizontally displacement in cavity 10 and from vertically extending part 1201 top bending horizontal expansion for the lateral extension portions 1202 limiting the lamp bar 2 vertical moving displacement in cavity 10.Enclose between vertically extending part 1201 and lateral extension portions 1202 and form the draw-in groove snapping in location for lamp bar 2, when specifically installing, lamp bar 2 can slip into from the end away from vertically extending part 1201 of lateral extension portions 1202 and be installed in draw-in groove, and lateral extension portions 1202 can be withheld on lamp bar 2 position being positioned at draw-in groove.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 3, Fig. 6, Fig. 7 and Fig. 8, lateral extension portions 1202 includes the empty avoiding portion 12022 that guide part 12021 is connected and the attaching part 12023 being connected between empty avoiding portion 12022 and guide part 12021 with vertical extension, the relative empty avoiding portion 12022 of attaching part 12023 and guide part 12021 are downwardly concaved setting, and guide part 12021 tilts setting obliquely from the end away from attaching part 12023 of attaching part 12023.Attaching part 12023 is mainly used in realizing lateral extension portions 1202 and lamp bar 2 is withheld function；The setting of guide part 12021, can slip into lamp bar 2 and play guide effect below lateral extension portions 1202；The setting in empty avoiding portion 12022, can reduce the contact area of lateral extension portions 1202 and lamp body 22, thus the installation and removal of more conducively lamp bar 2.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 2, Fig. 6, Fig. 7 and Fig. 8, several Horizontal limiting ribs 13 also it are convexly equipped with on support rod 11, each Horizontal limiting rib 13 and each vertically extending part 1201 carry out Horizontal limiting, Horizontal limiting rib 13 and vertically extending part 1201 respectively and can carry out spacing to lamp bar 2 from the both sides of lamp bar 2 width from the two opposite sides of lamp bar 2 to lamp bar 2.Herein, setting by Horizontal limiting rib 13, the situation that when can effectively prevent being given a shock shock during product complete machine packed and transported, lamp bar 2 is deviate from draw-in groove and transportation, during product rolling, lamp bar 2 skids off in draw-in groove occurs, and has fully ensured that the solid and reliable property of installation of lamp bar 2.

Preferably, in the lump with reference to shown in Fig. 5 and Fig. 8, the rear lateral portion of backboard 1 is provided with at least one hollow hole 14 arranged with middle buckle 122 para-position, and the 122 liang of sides of middle buckle arranged with hollow hole 14 para-position are also convexly equipped with two little cam 15.Describe for the ease of distinguishing, herein, the middle buckle 122 not arranged with hollow hole 14 para-position is defined as the first buckle 1221, the middle buckle 122 arranged with hollow hole 14 para-position is defined as the second buckle 1222.The setting of hollow hole 14, is on the one hand beneficial to reduce the material cost of product, on the other hand can be beneficial to the manufacture molding of the second buckle 1222.The setting of cam, on the one hand can be used for being in the light, thus can prevent the light that lamp bar 2 sends from hollow hole 14 penetrates backboard 1；On the other hand can be used for further lamp bar 2 being withheld location.

Preferably, each buckle structure 12 includes two end anchors 121 and four middle buckles 122, and wherein having buckle 122 in the middle of four of a buckle structure 12 to include two the first buckles 1221 and two the second buckles 1222 respectively, each first buckle 1221 is all located between an end anchors 121 and second buckle 1222.Of coursing, specifically apply, the set-up mode of buckle structure 12 is not limited to this.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 2, Fig. 6 and Fig. 7, some pieces also it are convexly equipped with in cavity 10 for lamp bar 2 is guided installation and the guide stop block 16 of pre-determined bit.The setting of guide stop block 16, is mainly used in when installing lamp bar 2 lamp bar 2 is carried out pre-determined bit, to realize the blind dress of lamp bar 2, thus improves the production and assembly efficiency of product.

Preferably, guide stop block 16 is identical with the quantity of buckle structure 12, one end buckle 121 side that every piece of guide stop block 16 is respectively arranged in a buckle structure 12.When installing lamp bar 2, the one end of lamp bar 2 can be made to be resisted against on guide stop block 16, lamp bar 2 is slipped into being installed in buckle structure 12 the most again.After lamp bar 2 is installed and put in place, the end of lamp bar 2 can depart from the contact of guide stop block 16, thus is beneficial to ensure that guide stop block 16 will not hinder lamp bar 2 freely stretching under high and low temperature environment.

Preferably, each guide stop block 16 is all convexly equipped on the left inside sidewall of cavity 10, and each guide stop block 16 lays respectively at the side of the cavity 10 each end anchors of left inside sidewall 121.When installing lamp bar 2, the left side of lamp bar 2 can be made to be resisted against on guide stop block 16, lamp bar 2 is slipped into being installed in buckle structure 12 the most again.

Preferably, in the lump with reference to shown in Fig. 2, Fig. 6, Fig. 8 and Fig. 9, the sidepiece of lamp bar 2 is provided with open pore 211, being convexly equipped with in cavity 10 and close for limiting the locating dowel 17 that lamp bar 2 moves along its length with open pore 211 card inserting, open pore 211 is arranged along the length direction of lamp bar 2 near the centre position of lamp bar 2.The card inserting of locating dowel 17 and open pore 211 is closed, and can realize lamp bar 2 accurately guiding and horizontal direction is accurately positioned, thus be beneficial to improve further the solid and reliable property that lamp bar 2 is installed；And owing to open pore 211 is proximate to what lamp bar 2 centre position was arranged, therefore so that lamp bar 2 still freely can stretch to two ends at length direction.

Preferably, open pore 211 is that the U-shaped loudspeaker perforate being located at lamp bar 2 side, the i.e. profile of open pore 211 are substantially U-shaped and its opening part is that the wealthy shape of the mouth as one speaks of loudspeaker is arranged, and so, can be beneficial to locating dowel 17 and preferably install with open pore 211 and coordinate.

Preferably, in the lump with reference to shown in Fig. 2, Fig. 6, Fig. 7 and Fig. 9, in cavity 10, be additionally provided with several projections 18, lamp bar 2 runs through be provided with several respectively with the spacing hole 212 of each projection 18 matched in clearance.Can be used for coordinating between projection 18 with spacing hole 212 realizing the coarse positioning to lamp bar 2, be beneficial to improve further the solid and reliable property that lamp bar 2 is installed.And the matching design between projection 18 and spacing hole 212 is matched in clearance, locating dowel 17 can be made will not to hinder freely stretching of lamp bar 2.

Preferably, in the lump with reference to shown in Fig. 1, Fig. 3 and Fig. 9, lamp bar 2 is LED lamp bar, and it includes the LED lamp 22 that substrate 21 and several intervals are convexly equipped on substrate 21, open pore 211 hole and spacing hole 212 are all located on substrate 21, and substrate 21 is withheld on support rod 11 by attaching part 12023.The material of substrate 21 can be aluminium sheet or phenolic resin plate etc., and the material of backboard 1 can be plastic cement or galvanizing steel plate etc..Herein, lamp bar 2 uses the plan of establishment of LED lamp bar, and its compact conformation, flexible for installation, energy-saving effect is good, length in service life, luminous efficiency are high, environmental-protecting performance is good, can beneficially improve the combination property of product；Of coursing, in concrete application, lamp bar 2 is not limited to use LED lamp bar.

Preferably, lamp bar 2, buckle structure 12 and guide stop block 16 are designed with two, and it is on the premise of meeting properties of product, also have simple in construction, feature easy for installation；Of coursing, in concrete application, the quantity of lamp bar 2, buckle structure 12 and guide stop block 16 is not limited to this.

In this utility model embodiment, the installation process of lamp bar 2 is as follows: be positioned in the way of guide stop block 16 is close in left side on support rod 11 by lamp bar 2, and make the side of lamp bar 2 be positioned at the guide part 12021 of buckle structure 12, both hands pinch the position near two first buckles 1221 at lamp bar 2 two ends, lamp bar 2 is slided towards empty avoiding portion 12022 from guide part 12021, after lamp bar 2 is slidably installed and puts in place, under the common effect of attaching part 12023 and Horizontal limiting rib 13, the sound of clicker will be heard, such that show that the assembling of lamp bar 2 completes.In the whole installation operation of lamp bar 2, user can hand operation complete, and without by any aid, it is very simple, convenient that it installs operation.

The lamp bar mounting structure of the straight-down negative display device that this utility model embodiment provides, is preferably applied in directly-down liquid crystal display device, such as LCD TV or the liquid crystal display of computer or computer all-in-one machine etc..Directly-down liquid crystal display device specifically may also include reflector plate 3, optical diffusion sheet, diaphragm 4, liquid crystal screen component 5, bonnet etc., reflector plate 3, optical diffusion sheet, diaphragm 4 and liquid crystal screen component 5 are all installed on the front side portion of backboard 1, reflector plate 3 is between lamp bar 2 and optical diffusion sheet, diaphragm 4 is between optical diffusion sheet and liquid crystal screen component 5, and bonnet covers the rear lateral portion being installed on backboard 1.

This utility model embodiment changes the lock screw fixed structure of existing lamp bar 2, viscous double faced adhesive tape fixed structure into Elastic buckle mounting structure; inherently solve and asynchronous cause lamp bar 2 to tilt owing to materials variances, lamp bar 2 and backboard 1 expand with heat and contract with cold, arch upward and cause the problem of product failure, after the most inherently solving product room temperature operational stoppage, occur that between lamp bar 2, screw and backboard 1, saltatory is slided and then produces the problem of the bad noise of crack in Pi because of systolic dyssynchrony at interiors of products simultaneously.In addition, lamp bar 2 uses snap fit arrangement, it is very simple, convenient that it installs operation, improve the production and assembly efficiency of product dramatically, and effectively reduce the cost of raw material (using the scheme of bonding way especially with respect to lamp bar 2) of product, thus it is more conducive to improve the competitiveness of product in market.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent or improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.

Claims (10)

1. the lamp bar mounting structure of straight-down negative display device, including there is the backboard of cavity and several are spaced the lamp bar being installed in described cavity, it is characterised in that: it is convexly equipped with the support rod for supporting described lamp bar in described cavity and several are for respectively by each described lamp bar spring fastening buckle structure on described support rod.

2. the lamp bar mounting structure of straight-down negative display device as claimed in claim 1, it is characterised in that: each described buckle structure include two end anchors being respectively used to withhold described lamp bar both ends and at least one described in two between end anchors for the middle buckle of the middle part withholding described lamp bar.

3. the lamp bar mounting structure of straight-down negative display device as claimed in claim 2, it is characterised in that: described end anchors and described middle buckle all include being vertically arranged for limiting the described lamp bar vertically extending part moving horizontally displacement in described cavity and from the bending horizontal expansion of described vertically extending operative tip for the lateral extension portions limiting the described lamp bar vertical moving displacement in described cavity.

4. the lamp bar mounting structure of straight-down negative display device as claimed in claim 3, it is characterized in that: described lateral extension portions includes the empty avoiding portion that guide part is connected and the attaching part being connected between described empty avoiding portion and described guide part with described vertical extension, described attaching part the most described empty avoiding portion and described guide part are downwardly concaved setting, and described guide part tilts setting obliquely from the end away from described attaching part of described attaching part.

5. the lamp bar mounting structure of the straight-down negative display device as described in claim 3 or 4, it is characterized in that: be also convexly equipped with several Horizontal limiting ribs, each described Horizontal limiting rib and each described vertically extending part on described support rod and from the two opposite sides of described lamp bar, described lamp bar carried out Horizontal limiting respectively.

6. the lamp bar mounting structure of the straight-down negative display device as described in any one of claim 2 to 4, it is characterized in that: the side back to described middle buckle of each described end anchors extends on the medial wall of this end anchors close being fixedly connected on described cavity, and the both sides towards end anchors described in two of each described middle buckle are unsettled setting.

7. the lamp bar mounting structure of the straight-down negative display device as described in any one of claim 2 to 4, it is characterized in that: the rear lateral portion of described backboard is provided with at least one hollow hole arranged with described middle buckle para-position, the side, described middle buckle both sides arranged with described hollow hole para-position is also convexly equipped with two little cam.

8. the lamp bar mounting structure of the straight-down negative display device as described in any one of Claims 1-4, it is characterised in that: also it is convexly equipped with in described cavity for described lamp bar is guided installation and the guide stop block of pre-determined bit.

9. the lamp bar mounting structure of the straight-down negative display device as described in any one of Claims 1-4, it is characterized in that: the sidepiece of described lamp bar is provided with open pore, being convexly equipped with in described cavity and close for limiting the locating dowel that described lamp bar moves along its length with described open pore card inserting, described open pore is arranged along the length direction of described lamp bar near the centre position of described lamp bar.

10. the lamp bar mounting structure of the straight-down negative display device as described in any one of Claims 1-4, it is characterised in that: be additionally provided with several projections in described cavity, described lamp bar runs through be provided with several respectively with the spacing hole of each described projection matched in clearance.