CN103090275A - Light-emitting diode (LED) backlight module provided with elastic regulating device - Google Patents

Abstract

The invention provides a light-emitting diode (LED) backlight module provided with an elastic regulating device. The LED backlight module provided with the elastic regulating device comprises a light guide plate (LGP), an LED light bar, a radiating plate and a back plate, and an elastic connecting component is further arranged between the outer side of a vertical panel of the radiating plate and the inner side of a lateral plate of the back plate to regulate the distance between the lateral plate and the vertical panel. The LED backlight module provided with the elastic regulating device further comprises a fixing part used for connecting a base panel to a back base plate. According to the LED backlight module provided with the elastic regulating device, the elastic connecting component is added between the radiating plate and the back plate, the radiating plate is enabled to be capable of achieving certain relative motion in a containing cavity of the back plate, and thus the LED light bar on the radiating plate can be tightly attached to the LGP at any time when the LGP is extensible in length due to the fact that the LGP is enabled to expand after being heated or absorbing moisture in a working process of the backlight module.

Description

LED-backlit module with flexible adjustment device

Technical field

The present invention relates to field of display, especially relate to the LED-backlit module with flexible adjustment device.Background technology

As shown in Figure 1, at the LED(of existing display light emitting diode) in backlight module 1, in order to guarantee the cooperation of LGP 11 andLED lamp bar 12, need between to reserve certain gap.But this gap generally can not be excessive, because if excessive, can reduce light utilization efficiency, causes the luminous energy loss, and then cause electric energy loss.Therefore in actual use, LGP 11 is more near theLED lamp 121 onLED lamp bar 12, and the result of use of thisLGP 11 is best.And the reason of preset clearance is in LED-backlit module 1, and in the course of work of LED-backlit module 1,LED lamp 121 is luminous energy by electric energy conversion, produces certain heat, causes temperature rising in whole LED-backlit module 1.And this heat easily makes LGP 11 expanded by heating, and thisLGP 11 also can absorb airborne moisture in a humid environment and expand.When LGP 11 be heated or moisture expantion after, the side of its LGP 11 can touch the surface ofLED lamp 121, can cause like thisLED lamp 121 to be subjected to stress and damage.And when LED-backlit module 1 runs into the large or humidity of variations in temperature and changes greatly, the length of the expansion of thisLGP 11 increase greater than preset clearance apart from the time, LGP 11 is owing to expanding and the stressed generation warpage in both sides, thereby makes display frame bad.Bad performance is relevant with stress distribution, generally can form larger area subcircular clear zone or dark space, speck or the blackening that the multizone small size also can occur, and afterLGP 11 warpages, to display device TFT(TFT) cause stress, thereby make picture bad, particularly when LGP 11 pushes upbad LED lamp 121, make backlight function lose efficacy.

Summary of the invention

The object of the invention is to solve LGP in existing LED-backlit module is heated or moisture expantion after warpage easily occurs and the stress damage of LED lamp is caused the bad shortcoming of display frame, LED-backlit with flexible adjustment device module is provided, this flexible adjustment device in order to tackle LGP because of be heated or moisture expantion after in the longitudinal direction flexible of LGP.

the technical scheme that the present invention solves its technical problem employing is: the LED-backlit module with flexible adjustment device, it comprises LGP, be placed in the LED lamp bar of described LGP both sides and heat sink and the backboard of fixing described LED lamp bar, described backboard comprises orthogonal back of the body substrate and side plate, described back of the body substrate and described side plate are surrounded by a cavity volume jointly, described heat sink is positioned at the cavity volume of described backboard, described heat sink comprises orthogonal vertical panel and bottom panel, described LED lamp bar is fixed on the inboard of described vertical panel, the side plate of described backboard is faced mutually with the vertical panel of described heat sink, described heat sink is fixed on described back of the body substrate by described bottom panel, also be provided with elastic connecting component between the side plate inboard of the outside of the vertical panel of described heat sink and described backboard, in order to regulate the distance between described side plate and described vertical panel.

Particularly, described LED-backlit module with flexible adjustment device also comprises described bottom panel is connected in fixture on described back of the body substrate, and described fixture has the body of rod that passes described bottom panel and described back of the body substrate; Described bottom panel offers the conduit that the described body of rod is slided within it, to regulate the relative position of described bottom panel and described back of the body substrate along with the distance adjustment between described side plate and described vertical panel.

Particularly, the outside of the vertical panel of described heat sink is provided with the step datum hole, the side plate inboard of described backboard is provided with the boss relative with described step datum hole, and described elastic connecting component one end is placed in described step datum hole, and the other end is sheathed on described boss.

Particularly, described elastic connecting component comprises at least one spring, the mutual butt of vertical panel of an end of described spring and described heat sink, the mutual butt of the side plate of the other end and described backboard.

Particularly, described LED lamp bar comprises a substrate, is located at LED lamp and bolster on described substrate, and described substrate is fixed in the vertical panel of described heat sink strip and the opposite side of described LGP.

Further, the height of described bolster is greater than the height 0.1 ~ 0.3mm of described LED lamp.

Further, described bolster is pasted on described substrate.

Particularly, the described body of rod is screw, described conduit is the elongated waist hole that is opened on described bottom panel, described screw passes described elongated waist hole, the back of the body substrate of described backboard is provided with the through hole that can pass through for described screw, and also being provided with respect to the opposite side of described bottom panel at described back of the body substrate can be for the fixing erection column of described screw.

Further, described erection column is provided with the internal thread fixing with described screw fit.

Further, also be provided with bullet pad and plain cushion between the head of described screw and the bottom panel of described heat sink, described bullet pad and described plain cushion are sheathed on described screw.

Further, described screw is step machine tooth screw.

beneficial effect of the present invention is: the LED-backlit module with flexible adjustment device provided by the present invention, added elastic connecting component between heat sink and backboard, make heat sink can realize certain relative motion in backboard inside, make like this LGP in the backlight module course of work, be heated or moisture absorption and expanding causes its length to occur when flexible, LED lamp bar on heat sink can be close on LGP at any time, and this structure of being close to, can improve LGP to the leaded light efficient of LED lamp bar on the one hand, improve the utilization rate of LED lamp, reduce luminous energy damages as far as possible, thereby saves energy, on the other hand, this elastic construction, guaranteed that LGP is in the telescopic process that expands, LGP and LED lamp bar can fully be dissolved LGP because expand to the stress of LED lamp generation by elastic connecting component, make the LED lamp be unlikely to be subjected to stress and damage, and LGP can not cause because of expansion warpage yet, thereby avoided because the bad problem of display frame that the LGP warpage is brought.

Description of drawings

Fig. 1 is the half sectional view of traditional LED-backlit module;

Fig. 2 is the half sectional view of the LED-backlit module that provides of the embodiment of the present invention;

Fig. 3 is the partial enlarged drawing at A place in Fig. 2;

Fig. 4 is the partial enlarged drawing at B place in Fig. 2.

In figure: 1-tradition LED-backlit module 11-LGP 12-LED lamp bar 121-LED lamp;

2-LED backlight module 21-LGP

22-LED lamp bar 221-substrate 222-bolster

23-heat sink 231-vertical panel 2311-step datum hole

232-bottom panel 2321-conduit (elongated waist hole)

24-backboard 241-side plate 2411-boss

The through hole 2422-erection column of 242-back of the body substrate 2421-back of the body substrate

The 243-cavity volume

25-elastic connecting component 26-fixture

The 261-body of rod (screw) 262-plain cushion 263-bullet pad

The specific embodiment

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

Referring to Fig. 2-Fig. 4, be the LED-backlit module 2 with flexible adjustment device provided by the present invention.It comprises LGP 21, be placed in theLED lamp bar 22 ofLGP 21 both sides andheat sink 23 and thebackboard 24 of fixing describedLED lamp bar 22,backboard 24 comprises orthogonal back of thebody substrate 242 andside plate 241, back of thebody substrate 242 is surrounded by acavity volume 243 jointly withside plate 241,heat sink 23 is positioned at thecavity volume 243 ofbackboard 24, and specifically in the present embodiment,heat sink 23 is the L font structure,heat sink 23 comprises orthogonalvertical panel 231 andbottom panel 232, andvertical panel 231 andbottom panel 232 are one-body molded.Be respectively equipped with twoheat sinks 23 of relatively establishing inLGP 21 both sides, and be installed with twoLED lamp bars 22 of relatively establishing on thevertical panel 231 ofheat sink 23, and the light emitting source ofLED lamp bar 22 is relative with LGP.LED lamp bar 22 is fixed on the inboard of describedvertical panel 231, and theside plate 241 ofbackboard 24 is faced mutually with thevertical panel 231 ofheat sink 23, andheat sink 23 is fixed on back of thebody substrate 242 by bottom panel 232.Also be provided with elastic connectingcomponent 25 betweenside plate 241 inboards of the outside of thevertical panel 231 ofheat sink 23 andbackboard 24, in order to regulate the distance betweenside plate 241 and vertical panel 231.Thiselastic parts 25 makes theheat sink 23 in LED-backlit module 2 to have in the horizontal direction certain operating range withbackboard 24, and makesLED lamp bar 22 on thevertical panel 231 of being located atheat sink 23 can be affixed on the side of LGP 21.And this matching relationship betweenLED lamp bar 22 and LGP 21 can improve the leaded light efficient of 21 pairs ofLED lamp bars 22 of LGP, and improves the utilization rate of LED lamp, reduce luminous energy as far as possible and damage, thereby saves energy improves the efficient of whole LED-backlit module 2.And this elastic connectingcomponent 25 makes twoheat sinks 23 in LED-backlit module 2 can have the distance of one section relative motion between thebiside plate 241 of backboard 24.This move distance is namely the extendable room of LGP 21.In the present invention, the adjustable range of this elastic connectingcomponent 25 is between 0.5 ~ 2mm, and the horizontal both sides at LGP 21 are equipped with elastic connectingcomponent 25, make namely in LED-backlit module 2 in the present invention, and the scalable scope of LGP 21 is between 0 ~ 4mm.And flexible scope can guarantee can not occur when LGP 21 uses in any environment LGP 21 extruding and causes the LED lamp onLED lamp bar 22 to break, and causes backlight module to lose efficacy; Perhaps LGP 21 is due to expansion, and in backlight module, the space causes notLGP 21 warpages and the bad problem appearance of display frame occurs.

Simultaneously, when elastic connectingcomponent 25 madeheat sink 23 to relatively move a segment distance in thecavity volume 243 thatbackboard 24 forms, thebottom panel 232 ofheat sink 23 also was fixed on the back of thebody substrate 242 ofbackboard 24 movably.Therefore, LED-backlit module 2 provided by the present invention also comprisesbottom panel 232 is connected in thefixture 26 of the back of the body on substrate 242.Describedfixture 26 has the body ofrod 261 that passesbottom panel 232 and back of thebody substrate 242;Bottom panel 242 offers theconduit 2321 that the body ofrod 261 is slided within it, to regulatebottom panel 232 and back of thebody substrate 242 relative positions along with the distance adjustment betweenside plate 241 and vertical panel 231.Thisfixture 26 makesheat sink 23 interior when mobile atcavity volume 243, andheat sink 23 still is fixed onbackboard 24, guarantees the globality of whole LED-backlit module 2.

Further, the outside of thevertical panel 231 ofheat sink 23 is provided withstep datum hole 2311,side plate 241 inboards ofbackboard 24 are provided with theboss 2411 relative with describedstep datum hole 2311, elastic connectingcomponent 25 1 ends are placed instep datum hole 2311, and the other end is sheathed on described boss 2411.Namely this elastic connectingcomponent 25 is located between thestep datum hole 2311 of theboss 2411 ofside plate 241 and heat sink 23.Particularly, in the present embodiment, this elastic connectingcomponent 25 comprises at least one spring.Therefore be provided with thestep datum hole 2311 that at least one coordinates with this spring on thevertical panel 231 ofheat sink 23, the correspondingstep datum hole 2311 of each spring.Also be provided with at least oneboss 2411 and coordinate with spring on theside plate 241 ofbackboard 24, thecorresponding boss 2411 of each spring.In the present embodiment, each side is provided with two springs, therefore altogether is provided with four springs in whole LED-backlit module 2.Theheat sink 23 that is every side is provided with twostep datum holes 2311, and on theside plate 241 of thebackboard 24 of every side, correspondence is provided with two boss 2411.And an end of spring is located in thestep datum hole 2311 ofvertical panel 231 ofheat sink 23, and the other end is sheathed on theboss 2411 of backboard 24.Be an end of spring and the mutual butt ofvertical panel 231 ofheat sink 23, the mutual butt ofside plate 241 of the other end and backboard 24.By elastic connectingcomponent 25 betweenbackboard 24 andheat sink 23 can the dynamic adjustments backlight module in the position relationship ofLGP 21 and LED lamp bar 22.Under the original state of installing, the spring in elastic connectingcomponent 25 is in relaxed state, and theLED lamp bar 22 on thevertical panel 231 ofheat sink 23 touches the side of LGP 21 at this moment.In the use procedure of LED-backlit module, LGP 21 because be heated or moisture absorption after expand, in the expansion process of LGP 21, its horizontal length increases, therefore the side plate of LGP 21 promotionLED lamp bar 22 toward back plate 41 moves,side plate 241 directions that arevertical panel 231 towardback plate 24 ofheat sink 23 move, and this moment, spring was in compressive state.In LGP 21 expansion processes,LED lamp bar 22 is close to the side of LGP 21 all the time, has guaranteed LED-backlit module 2 efficient operation all the time.And the length that thisLGP 21 increases because of expansion is in the adjustable range 0 ~ 4mm of this elastic connecting component.Therefore can guarantee that LGP 21 the phenomenon of warpage can not occur.And reduce or humidity when reducing when the operating temperature of LED-backlit module 2, LGP 21 shrinks, and gets back to the state of initial assembling, at this moment, spring onelastic connecting component 25 plays the effect that resets, and pushes thevertical panel 231 ofheat sink 23 to LGP 21.In a word, thiselastic connecting component 25 guaranteed in LED-backlit module 2, and LGP 21 remains on a minimum safe distance with LED lamp bar, makes the utilization rate of light the highest.

Further, see also Fig. 3,LED lamp bar 22 comprises asubstrate 221, is located at LED lamp andbolster 222 onsubstrate 221, andsubstrate 221 is fixed in thevertical panel 231 ofheat sink strip 23 and the opposite side of described LGP 21.Describedbolster 222 is pasted on described substrate 221.This bolster is a kind of plastic material PC, and its thickness is in about 1.2mm, and this bolster is located between two adjacent LED lamps, uses special glue to be bonded on substrate 221.Arranging of thisbolster 222 is mainly in order to protect the LED lamp onLED lamp bar 22 can not break because of the expansion of LGP 21.Because the height ofbolster 222 is greater than the height 0.1 ~ 0.3mm of described LED lamp.In the present embodiment, the height ofbolster 222 is 1mm, and the height of LED lamp is 0.8mm; Therefore the height ofbolster 222 is higher than the height 0.2mm of LED lamp.WhenLED lamp bar 22 is close toLGP 21; atfirst touch LGP 21 bybolster 222; the top that makes the LED lamp all the time and the distance of 0.2mm arranged betweenLGP 21; the stress that expands when extending guaranteedLGP 21 because can not directly act on the LED lamp; but act onbolster 222, thereby play the effect of protecting LED lamp onLED lamp bar 22.

Further, see also Fig. 4, in the present embodiment, the described body ofrod 261 isscrew 261, describedconduit 2321 is for being opened in theelongated waist hole 2321 onbottom panel 232,screw 261 passeselongated waist hole 2321, and the back of thebody substrate 242 ofbackboard 24 is provided with the throughhole 2421 that can pass through forscrew 26, and also being provided with respect to the opposite side of describedbottom panel 232 at described back of thebody substrate 242 can be for thefixing erection column 2422 of screw 261.Receive the effect of elastic connectingcomponent 25 due toheat sink 23, can have in the horizontal direction certain scope of activities with respect to backboard 24.Therefore, thebottom panel 232 atfin 23 is fixed on the back of thebody substrate 242 ofbackboard 24 movably.And onbottom panel 232 along the moving direction ofheat sink 23, namely the axis direction of elastic connectingcomponent 25 is provided withelongated waist hole 2321, makes the hold-downscrew 261 can be in thehole 2321 interior activities of elongated waist.When LGP 21 expanded by heating, side plate one side shifting ofheat sink 23 towardback plate 24, although this moment, thebottom panel 232 ofheat sink 23 was fixed on the back of thebody substrate 242 ofbackboard 24, butscrew 261 can be in thehole 2321 interior activities of elongated waist, soheat sink 23 can move outside along continuous straight runs in the limited field in elongated waist hole 2321.When LGP 21 shrinks, the effect of receiving elastic connectingcomponent 25,heat sink 23 is close toLGP 21 in the middle of being pushed to by spring, sobottom panel 232 along continuous straight runs of LGP 23 move inward.Andbackboard 24 also is provided witherection column 2422 with the connecting length of prolongation withscrew 261 for hold-down screw 261 at the back side of backboard 24.Erection column 2422 is provided with the internal thread that is fixed with screw 261.Screw 261 is fixed on the back of thebody substrate 242 ofbackboard 24 by erection column 2422.In order to make being fixed onbackboard 24 thatheat sink 23 can be more movable, also be provided withbullet pad 263 andplain cushion 262 between thebottom panel 232 of the head ofscrew 261 andheat sink 23,bullet pad 263 andplain cushion 262 are sheathed on screw 261.And in the present embodiment, thisscrew 261 is step machine tooth screw.

These are only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. the LED-backlit module that has the flexible adjustment device, it comprises LGP, be placed in the LED lamp bar of described LGP both sides and heat sink and the backboard of fixing described LED lamp bar, described backboard comprises orthogonal back of the body substrate and side plate, described back of the body substrate and described side plate are surrounded by a cavity volume jointly, described heat sink is positioned at the cavity volume of described backboard, described heat sink comprises orthogonal vertical panel and bottom panel, described LED lamp bar is fixed on the inboard of described vertical panel, the side plate of described backboard is faced mutually with the vertical panel of described heat sink, described heat sink is fixed on described back of the body substrate by described bottom panel, it is characterized in that, also be provided with elastic connecting component between the side plate inboard of the outside of the vertical panel of described heat sink and described backboard, in order to regulate the distance between described side plate and described vertical panel.

2. the LED-backlit module with flexible adjustment device as claimed in claim 1, it is characterized in that, described LED-backlit module with flexible adjustment device also comprises described bottom panel is connected in fixture on described back of the body substrate, and described fixture has the body of rod that passes described bottom panel and described back of the body substrate; Described bottom panel offers the conduit that the described body of rod is slided within it, to regulate the relative position of described bottom panel and described back of the body substrate along with the distance adjustment between described side plate and described vertical panel.

3. the LED-backlit module with flexible adjustment device as claimed in claim 1, it is characterized in that, the outside of the vertical panel of described heat sink is provided with the step datum hole, the side plate inboard of described backboard is provided with the boss relative with described step datum hole, described elastic connecting component one end is placed in described step datum hole, and the other end is sheathed on described boss.

4. the LED-backlit module with flexible adjustment device as described in claim 1 or 3, it is characterized in that, described elastic connecting component comprises at least one spring, the mutual butt of vertical panel of an end of described spring and described heat sink, the mutual butt of the side plate of the other end and described backboard.

5. the LED-backlit module with flexible adjustment device as claimed in claim 1, it is characterized in that, described LED lamp bar comprises a substrate, is located at LED lamp and bolster on described substrate, and described substrate is fixed in the vertical panel of described heat sink strip and the opposite side of described LGP.

6. the LED-backlit module with flexible adjustment device as claimed in claim 5, is characterized in that, the height of described bolster is greater than the height 0.1 ~ 0.3mm of described LED lamp.

7. the LED-backlit module with flexible adjustment device as claimed in claim 5, is characterized in that, described bolster is pasted on described substrate.

8. the LED-backlit module with flexible adjustment device as claimed in claim 2, it is characterized in that, the described body of rod is screw, described conduit is the elongated waist hole that is opened on described bottom panel, described screw passes described elongated waist hole, the back of the body substrate of described backboard is provided with the through hole that can pass through for described screw, and also being provided with respect to the opposite side of described bottom panel at described back of the body substrate can be for the fixing erection column of described screw.

9. the LED-backlit module with flexible adjustment device as claimed in claim 8, is characterized in that, also is provided with bullet pad and plain cushion between the head of described screw and the bottom panel of described heat sink, and described bullet pad and described plain cushion are sheathed on described screw.

10. have as claimed in claim 8 or 9 the LED-backlit module of flexible adjustment device, it is characterized in that, described screw is step machine tooth screw.

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