CN100375920C

CN100375920C - Liquid crystal display and its backlight module

Info

Publication number: CN100375920C
Application number: CNB2004100424132A
Authority: CN
Inventors: 张克勤; 陈复东; 王玉仙
Original assignee: Hannstar Display Corp
Current assignee: Hannstar Display Corp
Priority date: 2004-05-18
Filing date: 2004-05-18
Publication date: 2008-03-19
Anticipated expiration: 2024-05-18
Also published as: CN1700063A

Abstract

The invention relates to a liquid crystal display and its back light module, the said liquid crystal display includes an optical diaphragm group, the optical diaphragm group has at least one optical diaphragm disposed on back light module; the backlight module comprises a shell and at least one gap pillar; the shell is provided with a bottom plate, the bottom plate is provided with at least one through opening, and the bottom plate is provided with an inner side facing the optical diaphragm and an outer side opposite to the inner side; the gap support is arranged in the through opening from the outer side of the bottom plate, is fixed on the bottom plate and is used for supporting the optical diaphragm. The fine adjustment actions of the backlight module and the optical diaphragm set can not cause the gap support to scratch the optical diaphragm. When the lamp tube is out of order and the shell needs to be disassembled, the gap support post can be removed from the outer side of the shell to avoid scratching the diffusion plate. The clearance support column has the advantages of simple assembly and convenience in resource recovery.

Description

LCD and module backlight thereof

Technical field

The present invention relates to a kind of LCD, and a kind of backlight liquid crystal display module that is used for, its space post is inserted by this module backlight outside and is fixed on the base plate of module backlight.

Background technology

Along with the progress of electronics technology, the accompanied electronic product is in vogue especially in daily life, increases day by day for the demand of the display compact, that power consumption is low.LCD (Liquid CrystalDisplay; LCD) because have that power consumption power is low, thermal value is few, the advantage of in light weight and non-light emitting type display or the like, be often used in this type of the electronic product, even progressively replace traditional cathode-ray tube display.

Generally speaking, LCD has a module backlight usually, in order to provide its liquid crystal panel required light source.This LCD can be used the module backlight of different types according to the difference of its purposes or size, and module backlight is divided into straight module backlight (down straight aphototropism mode set) of light source pattern down and the module backlight of side light source pattern (side type module backlight) usually.

As shown in Figure 1, Fig. 1 shows that one has the normally used LCD 100 of down straight aphototropism mode set.This LCD 100 comprises a module 102 backlight, an optical diaphragm group 104, a liquid crystal panel 106 and a housing 108.This module 102 backlight is disposed at the below of this liquid crystal panel 106, in order to the light that a light source is sent, is projected to equably on the surface of liquid crystal panel 106.Described module backlight 102 comprises a metal shell 103 and is disposed at a plurality of fluorescent tubes 110 of these metal shell 103 bottoms.Described optical diaphragm group 104 is disposed between module 102 backlight and the liquid crystal panel 106, and comprises one and be positioned at diffuser plate 104a, on this module 102 backlight and be positioned at diffusion sheet 104b on this diffuser plate 104a, an and prismatic lens 104c who is positioned on the diffusion sheet 104b.Described housing 108 is disposed on described liquid crystal panel 106 and the described optical diaphragm group 104, and combines with described module 102 backlight, so that described liquid crystal panel 106 and described optical diaphragm group 104 are fixed on the described module backlight 102.

As shown in Figure 2, these fluorescent tube 110 compartment of terrains are disposed in the described metal shell 103 formed cavitys 105, and are positioned under the viewing area of described liquid crystal panel 106, so that the light that it was sent is uniformly distributed on the described liquid crystal panel 106.

Because LCD develops towards large scale, and size is more and more big, then the briliancy demand is more and more high.Especially, directly descend light source pattern module backlight to be applicable to the large scale liquid crystal display, therefore more and more important.Yet, directly descend the rayed area of light source pattern module backlight more and more big, its thickness is constant.Therefore, the structural strength deficiency that this directly descends light source pattern module backlight will deform easily.In order to solve the problem of distortion, described straight light source pattern module backlight down is provided with plural space post and is disposed at its inside, in order to strengthen the structure that this directly descends light source pattern module backlight.

Moreover, refer again to Fig. 2, since each fluorescent tube 110 must and diffuser plate 104a between have a certain fixing distance, therefore the base plate 103a of described metal shell 103 is provided with at least one space post 112, in order to supporting this diffuser plate 104a so that each fluorescent tube 110 can with this diffuser plate 104a fixing distance of being separated by.Be coated with a glue-line (not shown) on the base plate 103a of described metal shell 103, and described space post 112 is fixed on the base plate 103a of described metal shell 103 by means of this glue-line.

At present, when optical diaphragm group is assembled in straight time light source pattern module backlight, earlier described space post 112 is inserted and is fixed on the base plate 103a of described metal shell 103 in preposition mode (promptly by base plate 103a top), then this diffuser plate 104a, this diffusion sheet 104b and this prismatic lens 104c are disposed on this module 102 backlight.Yet described diffuser plate 104a and plural blooming piece need by the fine setting location, and this trimming movement may cause the surface of this space post 112 scratch diffuser plate 104a, and produces scratch on diffuser plate 104a, and then causes bad demonstration image quality.

For this reason, just having to provide a kind of module backlight, and its space post is inserted by plate outer side and is fixed on the base plate of the module backlight of moulding, in order to solve the problem of scratch diffuser plate.

Summary of the invention

The object of the present invention is to provide a kind of module backlight, its space post is inserted by this module backlight outside and is fixed on the base plate of this module backlight, in order to avoid the scratch diffuser plate.

Another object of the present invention is to provide a kind of LCD that adopts above-mentioned module backlight.

For reaching above-mentioned purpose, module backlight provided by the invention comprises: an optical diaphragm group; One shell, this shell has a base plate, and base plate is provided with at least one opening that runs through, and wherein said shell is provided with an inboard and outside, and described inboard is towards described optical diaphragm group, and the described outside is with respect to this inboard; One space post, this space post is inserted described running through in the opening by the outside of described shell, and is fixed on the described base plate, in order to support described optical diaphragm group.Wherein, described space post comprises: a teat is contacted with described optical diaphragm group; One pars intermedia is connected in described teat, and the diameter of this pars intermedia is not more than this diameter that runs through opening, and this pars intermedia is disposed at this and runs through in the opening by this; And a stopper is connected in described pars intermedia, and this stopper is positioned at the described outside and stops on the described base plate.

LCD provided by the invention comprises: a liquid crystal panel; One module backlight is configured in the below of described liquid crystal panel; And a housing, this housing combines with described module backlight, with fixing described liquid crystal panel.This module backlight comprises: an optical diaphragm group; One shell, this shell has a base plate, and base plate is provided with one and runs through opening, and wherein said shell is provided with an inboard and outside, and described inboard is towards described optical diaphragm group, and the described outside is with respect to described inboard; And, a space post, this space post is inserted described running through in the opening by the outside of described shell, and be fixed on the described base plate, in order to support described optical diaphragm group, wherein, described space post comprises: a teat is contacted with described optical diaphragm group; One pars intermedia is connected in described teat, and the diameter of this pars intermedia is not more than this diameter that runs through opening, and this pars intermedia is disposed at this and runs through in the opening by this; And a stopper is connected in described pars intermedia, and this stopper is positioned at the described outside and stops on the described base plate.

According to module backlight of the present invention, the trimming movement of described optical diaphragm group can not cause described space post to avoid this blooming piece of scratch; If fluorescent tube breaks down and when needing the dismounting shell, described space post can be removed by the extraterrestrial sidesway that changes shell earlier, in order to avoid the described diffuser plate of scratch; Moreover space post of the present invention has simple and easy assembling and the convenient advantage that reclaims resource.

Description of drawings

Fig. 1 is the perspective exploded view of the LCD of known technology;

Fig. 2 is the diagrammatic cross-section of the LCD of Fig. 1 along hatching line 2-2;

Fig. 3 is the perspective exploded view of LCD of the present invention;

Fig. 4 is the LCD of Fig. 3, when not disposing space post, along the diagrammatic cross-section of hatching line 4-4;

Fig. 5 is the LCD of Fig. 3, during the configuration space post, along the diagrammatic cross-section of hatching line 5-5;

Fig. 6 is the diagrammatic cross-section of LCD of the present invention, and it shows the diagrammatic cross-section of the space post of the first embodiment of the present invention;

Fig. 7 is the schematic perspective view of the space post of the first embodiment of the present invention;

Fig. 8 is the diagrammatic cross-section of LCD of the present invention, and it shows the diagrammatic cross-section of the space post of the second embodiment of the present invention;

Fig. 9 is the schematic perspective view of the space post of the second embodiment of the present invention;

Figure 10 is the diagrammatic cross-section of LCD of the present invention, and it shows the diagrammatic cross-section of the space post of the third embodiment of the present invention;

Figure 11 a is the perspective exploded view of the space post of the third embodiment of the present invention;

Figure 11 b is the schematic perspective view of the space post of the third embodiment of the present invention;

The figure number explanation:

LCD 100 module 102 metal shells 103 backlight

Base plate 103a optical diaphragm group 104 diffuser plate 104a

Diffusion sheet 104b prismatic lens 104c cavity 105

Liquid crystal panel 106 housings 108 fluorescent tubes 110

Space post 112 LCD 200 modules 202 backlight

Shell 203 base plate 203a optical diaphragm group 204

Diffuser plate 204a diffusion sheet 204b prismatic lens 204c

Cavity 205 liquid crystal panels 206 housings 208

Fluorescent tube 210 runs through opening 211 space post 212

Space post 312 teats 314 pars intermedias 316

Stopper 317 afterbodys 318 external threads 322

Internal thread 324 heat radiation holes 326 space post 412

Teat 414 pars intermedias 416 stoppers 417

External thread 422 internal threads 424 instruments 425

Heat radiation hole 426 space post 512 pillar bodies 513

Teat 514 pars intermedias 516 stoppers 517

Groove 522 overhead kick portions 532 tail ends 534

Jag 536

Embodiment

For allow above-mentioned purpose of the present invention, feature and advantage can be more obvious, embodiments of the invention cited below particularly, and cooperate appended diagram are described in detail below:

With reference to figure 3, the LCD 200 of one embodiment of the invention.This LCD 200 comprises a module 202 backlight (as straight light source pattern module backlight down), an optical diaphragm group 204, a liquid crystal panel 206 and a housing 208.Described module backlight 202 is configured in the below of described liquid crystal panel 206 and described optical diaphragm group 204, in order to the light that a light source is sent, is projected to equably on the surface of described liquid crystal panel 206.Described module backlight 202 comprises a shell 203, as metal shell, and a plurality of fluorescent tubes 210, as cold-cathode tube, be disposed at the bottom of described shell 203.Described optical diaphragm group 204 is configured between described module backlight 202 and the described liquid crystal panel 206, and comprise a diffuser plate 204a and an a plurality of blooming piece that is positioned on the described module backlight 202, as diffusion sheet 204b on the diffuser plate 204a and prismatic lens 204c as described in being positioned at.Described housing 208 is configured on described liquid crystal panel 206 and the described optical diaphragm group 204, and combines with described module 202 backlight, so that described liquid crystal panel 106 and described optical diaphragm group 204 are fixed on the described module backlight 202.Described fluorescent tube 210 compartment of terrains are configured in the described shell 203 formed cavitys 205, and are positioned under the viewing area of described liquid crystal panel 206, so that the light that it was sent is uniformly distributed on the described liquid crystal panel 206.

With reference to figure 4, described base plate 203a has the inboard and outside with respect to this inboard towards diffuser plate 204a.When described optical diaphragm group 204 is assembled in this module 202 backlight, earlier described diffuser plate 204a and a plurality of blooming piece are configured on this module 202 backlight, then with described diffuser plate 204a and a plurality of blooming piece fine setting location, at last the rearmounted mode of at least one space post 212 usefulness (promptly by base plate 203a below or its outside) being inserted one of described base plate 203a runs through in the opening 211 and is fixed on the base plate 203a of described shell 203, in order to support described diffuser plate 204a, as shown in Figure 5.Therefore, the trimming movement of described diffuser plate 204a and a plurality of blooming pieces can not cause the lower surface of the described diffuser plate 204a of described space post 212 scratches.Moreover if described fluorescent tube 210 faults and must dismounting during this shell 203, then this space post 312 can be earlier removed by the below or the outside of described shell 203, in order to avoid the described diffuser plate 204a of scratch.

Again with reference to figure 5, described this space post 212 make each fluorescent tube 210 can with the described diffuser plate 204a fixing distance of being separated by.Moreover described space post 212 is strengthened the structure of described module 202 backlight, avoids making described module backlight 202 to deform.

With reference to figure 6 and Fig. 7, the space post 312 that shows the first embodiment of the present invention among the figure is fixed in described base plate 203a in the mode that screw thread locks.Described space post 312 comprises a teat 314, a pars intermedia 316, a stopper 317 and an afterbody 318.Described teat 314 contacts with described diffuser plate 204a, and is generally white or transparent taper, and its material is polycarbonate (polycarbonate; PC) or organic glass (PMMA).Described pars intermedia 316 can be cylindric, is connected in this teat 314, and is provided with external thread 322.Described stopper 317 can be the cap shape, comprises flat or nut shape, and profile then can be circular or square, and is connected in described pars intermedia 316, and is positioned at the outside of described base plate 203a.Described afterbody 318 is connected in described stopper 317, and it can be en plaque, as semicircular plate, rotates with hand in order to make things convenient for the user.

The opening 211 that runs through of described base plate 203a is provided with internal thread 324, and this internal thread 324 is corresponding to the external thread 322 of described pars intermedia 316.Must insert this when running through opening 211 by described base plate 203a below when described space post 312, the user rotates the afterbody 318 of described space post 312 with hand.The external thread 322 of this pars intermedia 316 is engaged in the described internal thread 324 that runs through opening 211, so in the cavity 205 with the described module 200 backlight of teat 314 precessions of described space post 312.When the stopper 317 of described space post 312 stopped at described base plate, then described space post 312 was fixed on the base plate 203a of described shell 203.In like manner, when described space post 312 must be when running through of described base plate 203a takes out in the opening 211, the user so breaks away from this space post 312 the base plate 203a in described shell 203 with the afterbody 318 of the described space post 312 of hand backward rotation.The advantage that space post 312 of the present invention has simple and easy assembling and makes things convenient for resource to reclaim.

Moreover with reference to the 6th and 7 figure, described space post 312 also can comprise a plurality of interconnecting or independently dispel the heat separately hole 326 or groove in addition again, in order to the heat in the cavity 205 that distributes described shell 203.

With reference to figure 8 and Fig. 9, show among the figure that the space post 412 of the second embodiment of the present invention locks local formula with screw thread, be fixed in described base plate 203a.This space post 412 is similar to described space post 312 substantially, and similarly assembly indicates similar label.This space post 412 comprises a teat 414, a pars intermedia 416 and a stopper 417.Described teat 414 is contacted with described diffuser plate 204a.Described pars intermedia 416 is connected in described teat 414, and is provided with external thread 422.Described stopper 417 is connected in described pars intermedia 416, and is positioned at the outside of described base plate 203a, and it can be the nut shape, as hexagonal configuration, in order to make things convenient for the user by an instrument 425, rotates as the hexagon wrench.

The opening 211 that runs through of described base plate 203a is provided with internal thread 424, and it is corresponding to the external thread 422 of described pars intermedia 416.When described space post 412 must be placed in describedly when running through opening 211 by described base plate 203a below, user's tool using 425 rotates the stopper 417 of described space post 412.The external thread 422 of described pars intermedia 416 is engaged in the described internal thread 424 that runs through opening 211, so teat 414 precessions of described space post 412 is moulded in the cavity 205 of module 200 backlight.When the stopper 417 of described space post 412 stopped at described base plate 203a, then this space post 412 was fixed on the base plate 203a of described shell 203.In like manner, when described space post 412 must be when running through of described base plate 203a takes out in the opening 211, the stopper 417 of user's tool using 425 space post that backward rotation is moulded 412 so breaks away from described space post 412 the base plate 203a in described shell 203.The advantage that space post 412 of the present invention has the assembling security and makes things convenient for resource to reclaim.

Moreover again with reference to figure 8 and Fig. 9, described space post 412 also comprises a plurality of heat radiation holes 426 in addition, in order to the heat in the cavity 205 that distributes described shell 203.

With reference to Figure 10 and Figure 11 a-Figure 11 b, show the space post 512 of the third embodiment of the present invention among the figure, this space post 512 is fixed in this base plate 203a in the mode of mechanism's engaging.This space post 512 comprises a pillar body 513 and an overhead kick portion 532.Described pillar body 513 has a teat 514, a pars intermedia 516 and a stopper 517.Described teat 514 is contacted with described diffuser plate 204a.Described pars intermedia 516 can be cylindric or rectangle column etc., is connected in described teat 514, and has the outer rim that a groove 522 is positioned at described pars intermedia 516.Described stopper 517 is connected in described pars intermedia 516, and is positioned at the outside of described base plate 203a.Described overhead kick portion 532 has a tail end 534 and a jag 536, and this jag 536 can be sticked in the groove 522 of the pars intermedia of moulding 516.Described overhead kick portion 532 can be one and has the overhead kick portion that elastic material is manufactured.

The opening 211 that runs through of described base plate 203a can be circle or rectangular aperture, in order to the pars intermedia 516 corresponding to described pillar body 513.When described space post 512 must be placed in described when running through opening 211 by described base plate 203a below, the user earlier inserts the described opening 211 that runs through with described pillar body 513, then the jag 536 of described overhead kick portion 532 is inserted and is sticked in the groove 522 of described pars intermedia 516.The jag 536 of this overhead kick portion 532 catches on described base plate 203a, and so the teat 514 with described space post 512 is fixed in the cavity 205 of described module backlight 200.When the stopper 517 of described space post 512 stopped at described base plate 203a, then described space post 512 was fixed on the base plate 203a of described shell 203.In like manner, when described space post 512 must be when running through of described base plate 203a takes out in the opening 211, the user removes described overhead kick portion 532 earlier, and then removes described pillar body 513, so described space post 512 is broken away from the base plate 203a in described shell 203.The advantage that space post 512 of the present invention has simple and easy assembling and makes things convenient for resource to reclaim.

Moreover again with reference to figure 11a and Figure 11 b, described space post 512 is a hollow form, and is communicated with the groove 522 of described pars intermedia 516.Gap between described jag 536 and the described groove 522 can be in order to the heat in the cavity 205 that distributes described shell 203.

Though the present invention discloses with previous embodiment, so it is not in order to limiting the present invention, anyly is familiar with those skilled in the art, without departing from the spirit and scope of the present invention, and when doing various changes and modification.Therefore protection scope of the present invention is as the criterion with the protection domain of claim.

Claims

1. A backlight module for a liquid crystal display, comprising:

An optical diaphragm group;

A casing, the casing has a bottom plate, the bottom plate is provided with a through opening, wherein the casing is provided with an inner side and an outer side, the inner side faces the optical film group, and the outer side is opposite to the inner side; and

A gap pillar, the gap pillar is inserted into the through opening from the outside of the housing, and fixed on the bottom plate to support the optical film group, wherein the gap pillar includes:

a protruding part, which is in contact with the optical film group;

an intermediate portion connected to the protruding portion, the diameter of the intermediate portion being not greater than the diameter of the through opening, whereby the intermediate portion is disposed within the through opening; and

A blocking portion is connected to the middle portion, and the blocking portion is located on the outer side and stops on the bottom plate.

2. The backlight module for liquid crystal display according to claim 1, wherein said optical film set comprises a diffuser plate.

3. The backlight module for liquid crystal display according to claim 1, wherein said protruding part is in the shape of a cone.

4. The backlight module for liquid crystal display according to claim 1, wherein said middle part is columnar.

5. The backlight module for a liquid crystal display as claimed in claim 1, wherein said gap support comprises a tail connected to said blocking portion.

6. The backlight module for a liquid crystal display according to claim 5, wherein said tail portion is plate-shaped.

7. The backlight module for a liquid crystal display as claimed in claim 1, wherein said gap support further comprises a heat dissipation hole.

8. The backlight module for a liquid crystal display according to claim 1, wherein said gap support further comprises a heat dissipation groove.

9. The backlight module for liquid crystal display according to claim 1, wherein said gap pillar is hollow.

10. The backlight module for a liquid crystal display according to claim 1, wherein said blocking portion is located outside of said bottom plate.

11. The backlight module for a liquid crystal display according to claim 1, wherein said blocking portion is in the shape of a cap.

12. The backlight module for liquid crystal display according to claim 11, wherein the cap shape of the blocking part is flat or screw cap.

13. The backlight module for a liquid crystal display as claimed in claim 1, wherein said gap support is fixed to the bottom plate in a screw locking manner.

14. The backlight module for a liquid crystal display according to claim 13, wherein the through opening of the housing is provided with an internal thread.

15. The backlight module for a liquid crystal display according to claim 14, wherein said middle part is provided with an external thread corresponding to said internal thread passing through the opening.

16. The backlight module for a liquid crystal display as claimed in claim 1, wherein said gap support is fixed to said bottom plate in a mechanism engaging manner.

17. The backlight module for a liquid crystal display as claimed in claim 16, wherein said gap support further comprises a hook portion, and said hook portion fixes said protruding portion in said backlight module.

18. The backlight module for liquid crystal display according to claim 17, wherein the middle portion has a groove, and the hook portion has a protruding end, and the protruding end is engaged in the groove .

19. The backlight module for liquid crystal display according to claim 17, wherein said hook portion is a hook portion made of elastic material.

20. The backlight module for liquid crystal display according to claim 19, wherein there is a gap between said protruding end and said groove.

21. A liquid crystal display comprising:

a liquid crystal panel;

A backlight module, arranged under the liquid crystal panel, includes:

An optical diaphragm group;

a protruding part, which is in contact with the optical film group;

a stop connected to the middle part, the stop resting on the outer side and resting on the bottom plate; and

An outer frame, which is combined with the backlight module to fix the liquid crystal panel.

22. The liquid crystal display as claimed in claim 21, wherein said gap post further comprises a tail portion connected to said stop portion.

23. The liquid crystal display as claimed in claim 21, wherein said gap pillar further comprises a heat dissipation hole.

24. The liquid crystal display as claimed in claim 21, wherein said gap pillar is hollow.

25. The liquid crystal display as claimed in claim 21, wherein said gap support is fixed to said bottom plate in a screw locking manner.

26. The liquid crystal display as claimed in claim 21, wherein said gap support is fixed to said bottom plate by means of mechanical engagement.

27. The liquid crystal display of claim 26, wherein said gap post further comprises a barb, said barb securing said protrusion within said backlight module.

28. The liquid crystal display as claimed in claim 27, wherein said middle portion has a groove, and said hook portion has a protruding end, and said protruding end is engaged with said groove.