CN201062761Y

CN201062761Y - Backlight module

Info

Publication number: CN201062761Y
Application number: CNU2007201558294U
Authority: CN
Inventors: 古宇芳; 叶格铭
Original assignee: Chunghwa Picture Tubes Ltd
Current assignee: Cpt Display Technology (shenzhen)co Ltd
Priority date: 2007-06-29
Filing date: 2007-06-29
Publication date: 2008-05-21
Anticipated expiration: 2017-06-29

Abstract

The utility model relates to a backlight module, which comprises a light-guiding board and a light source. The light-guiding board comprises a light output surface; a reflective surface, which is arranged opposite to the light output surface and comprises a curved surface; and at least a gap, which is arranged at a side edge of the light-guiding board and is composed of a first plane and a second plane, wherein, the first plane is connected with the light output surface and the second plane is connected with the curved surface. The light source is held in the gap of the light-guiding board. So, the backlight module of the utility model can reduce the volume occupied by the light source and increase the brightness and uniformity of the backlight module.

Description

Backlight module

Technical field

The utility model relates to a kind of backlight module, refers to a kind of backlight module that is applicable to flat display apparatus especially.

Background technology

In recent years because the importance of display in people life increases day by day, except use a computer or the internet, television set, mobile phone, PDA(Personal Digital Assistant) and digital camera etc. must control transmission information by the transmission display device.Compared to traditional kinescope display, the flat-panel screens of New Times has advantage in light weight, that volume is little and radiationless, but problems such as its brightness, power consumption still have the space of improvement.

In numerous emerging flat-panel screens technology, be to be main flow at present with LCD (LCD).Because LCD is non-self luminous display, must be by can producing Presentation Function by adding the light source mode, so backlight module promptly plays the part of the role of light source in LCD, be one of important spare part of LCD.

In traditional display backlight source, adopt CCFL (CCFL) mostly with the illumination plane display.Cold cathode fluorescent tube short because of its in service life, power consumption is big and fluorescent tube in contain the mercury metal and easily environment polluted, its range of application is restricted.And light emitting diode (LED) is a kind of high efficiency active illuminating source, has advantages such as low power consumption, high brightness output and volume are little, so become a kind of good light source.

See also Fig. 1, be the schematic perspective view of existing backlight module 10, it mainly includes a LGP 11 and most light emitting diodes 12, and those light emitting diodes 12 are the light source of backlight module 10 for this reason.The LGP 11 of existing backlight module 10 is similar rectangular configuration, and the thickness of LGP 11 is identical as far as possible with light emitting diode 12 thickness, with loss and the decay that prevents the panel briliancy.The light source of backlight module 10 (light emitting diode 12) then is designed to lamp bar (Light Bar) form and is arranged in the side of LGP 11, and light is entered in the LGP 11 by side.Generally speaking, light emitting diode 12 can be high more with the approaching more resulting brilliancy of backlight module of distance of LGP 11.Therefore, as shown in Figure 1, when light emitting diode 12 was attached at LGP 11, light emitting diode 12 light utilization ratios were the highest, however but easily cause light emitting diode 12 enter LGP 11 at the interface or at the interface near one section bright band appears.

Moreover, the demand thin type development day by day of flat-panel screens at present, existing backlight module 10 is arranged in the side of LGP 11 with light emitting diode 12 with lamp bar (Light Bar) form, will inevitably increase taking up room to place light emitting diode 12 of backlight module 10.

Therefore, how increasing the briliancy and the homogeneity of existing backlight module, and reduce the volume that takies of backlight module, will be the problem of needing solution at present badly.

The utility model content

In view of this, the purpose of this utility model provides a kind of backlight module, comprising: a LGP and a light source, and this LGP comprises: an exiting surface; One reflecting surface is and this exiting surface subtend setting that this reflecting surface comprises a curved surface; And at least one breach, being arranged at a side of this LGP, this breach comprises one first plane and one second plane, and wherein this first plane is connected with this exiting surface, and this second plane is connected with this curved surface; In this breach of ccontaining this LGP of this light source.By this, reduce the volume that the light source of backlight module occupies, and increase the briliancy and the homogeneity of this backlight module.

In backlight module of the present utility model, the arrangement pattern of the breach of this LGP does not limit, and the quantity of this light source do not limit, and decides on LGP size or briliancy demand.In backlight module of the present utility model, this LGP has at least a side to have breach, is preferably that the single side of this LGP has breach or this limit, LGP two opposite sides has breach.In backlight module of the present utility model, be preferably a side and have a breach.And the ccontaining quantity of light source of each breach does not limit, and is preferably the ccontaining majority of a breach light source or the ccontaining light source of breach.

In backlight module of the present utility model, first plane of this LGP breach and the angle on second plane do not limit, and first plane of preferable breach for this reason and the angle on this second plane are the right angle, and second plane of this breach is lower than the exiting surface of LGP.

In backlight module of the present utility model, the thickness of the breach of this LGP does not limit, and is preferably the thickness that is equal to or less than this light source, and this light source can be placed in the breach fully, uses in order to the space.

In backlight module of the present utility model, the curved surface form of this LGP does not limit, and is preferably smooth surface, reaches good reflecting effect in order to light.

In backlight module of the present utility model, this light source does not limit and is attached at LGP, as long as try one's best LGP, is preferably this light source and is attached at LGP, to reduce loss of light intensity.

And in backlight module of the present utility model, the material of this LGP can be any transparent material, is preferably acrylic resin (acrylic resin) or polycarbonate resin (polycarbonateresin).This LGP also can be other transparent material, comprises acrylate (acrylic ester), polyester (polyester), thermoplastic resin (thermoplastic resin), transparent resin (transparent resin), clear glass (transparent glass) and crystalline ceramics (transparent ceramic).

In backlight module of the present utility model, the kind of these light sources does not limit, and is preferably light emitting diode (LED).And the glow color of these light sources does not limit, and is preferably white light source.

In backlight module of the present utility model, this backlight module alternative includes at least one optical diaphragm group, is disposed on this exiting surface of this LGP, and this optical diaphragm group is preferably prismatic lens, diffusion sheet or its combination.

In addition, the present invention provides a kind of flat display apparatus again, comprising: a display floater; And a backlight module, be positioned at a side of this display floater; Wherein, this backlight module comprises a LGP and a light source, and this LGP comprises an exiting surface; One reflecting surface is and this exiting surface subtend setting that this reflecting surface comprises a curved surface; At least one breach is arranged at a side of this LGP, and this breach comprises one first plane and one second plane, and wherein this first plane is connected with this exiting surface, and this second plane is connected with this curved surface; In this breach that this light source is ccontaining this LGP.

Adopt the flat display apparatus of this backlight module, owing to its light source can be placed in the breach, to reduce the volume that light source occupies, so the volume of flat display apparatus also reduces thereupon.And, because the light incident of light source when so far LGP is inner, can so can increase the briliancy and the homogeneity of backlight module, improve the briliancy and the homogeneity of display frame by the camber reflection of LGP thereupon.

In the flat display apparatus of the present utility model, this display floater can be any non-self luminous display floater, is preferably display panels.

In the flat display apparatus of the present utility model, the arrangement pattern of the breach of this LGP does not limit, and the quantity of this light source do not limit, and decides on LGP size or briliancy demand.In flat display apparatus of the present utility model, this LGP has at least a side to have breach, be preferably the single side of this LGP and have breach, or this limit, LGP two opposite sides has breach.In flat display apparatus of the present utility model, be preferably a side and have a breach.And the ccontaining quantity of light source of each breach does not limit, and is preferably the ccontaining majority of a breach light source or the ccontaining light source of breach.

In flat display apparatus of the present utility model, first plane of this LGP breach and the angle on second plane do not limit, and first plane of preferable breach for this reason and the angle on this second plane are the right angle, and second plane of this breach is lower than the exiting surface of LGP.

In flat display apparatus of the present utility model, the thickness of the breach of this LGP does not limit, and is preferably the thickness that is equal to or less than this light source, and this light source can be placed in the breach fully, uses in order to the space.

In flat display apparatus of the present utility model, the curved surface form of this LGP does not limit, and is preferably smooth surface, reaches good reflecting effect in order to light.

In flat display apparatus of the present utility model, this light source does not limit and is attached at LGP, as long as try one's best LGP, is preferably this light source and is attached at LGP, to reduce loss of light intensity.

And in flat display apparatus of the present utility model, the material of this LGP can be any transparent material, is preferably acrylic resin (acrylic resin) or polycarbonate resin (polycarbonateresin).This LGP also can be other transparent material, comprises acrylate (acrylic ester), polyester (polyester), thermoplastic resin (thermoplastic resin), transparent resin (transparent resin), clear glass (transparent glass) and crystalline ceramics (transparent ceramic).

In flat display apparatus of the present utility model, the kind of these light sources does not limit, and is preferably light emitting diode (LED).And the glow color of these light sources does not limit, and is preferably white light source.

In addition, in flat display apparatus of the present utility model, this backlight module alternative includes on this exiting surface that at least one blooming piece is disposed at this LGP, and this optical diaphragm group is preferably prismatic lens, diffusion sheet or its combination.

The beneficial effects of the utility model are to have increased the briliancy and the homogeneity of existing backlight module, and reduced the volume that takies of backlight module.

Description of drawings

Fig. 1 is existing backlight module schematic perspective view;

Fig. 2 is the backlight module schematic perspective view of the utility model one preferred embodiment;

Fig. 3 is the generalized section of Fig. 2;

Fig. 4 is the side view of the liquid crystal indicator of the utility model one preferred embodiment;

Fig. 5 is the backlight module schematic perspective view of another preferred embodiment of the utility model;

Fig. 6 is the backlight module schematic perspective view of the another preferred embodiment of the utility model.

[primary clustering symbol description]

Backlight module

10,20,40,50

LGPs

11,21,41,51

Light emitting diode

12,22,44,53 exiting surfaces 23

Curved surface 24 reflectings surface 25

Breach

26,42,43,52 first planes 27

Second plane, 28 diffusion sheets 29,31

Prismatic lens 30 display panels 60

The specific embodiment

These graphic schematic diagrames that are simplification among the embodiment of the present utility model.These icons only show the assembly relevant with the utility model, the aspect that its shown assembly is non-when being actual enforcement, and component count, the shape equal proportion during its actual enforcement is an optionally design, and its assembly layout kenel may be more complicated.

Embodiment one

Please consult Fig. 2 and Fig. 3 simultaneously, Fig. 2 is the schematic perspective view of the backlight module 20 of the utility model one preferred embodiment, and Fig. 3 is the generalized section of Fig. 2 along AA ' line.Present embodiment backlight module 20 mainly includes a LGP 21 and most light sources, and this light source is a white light emitting diode 22, and this LGP 21 is acrylic resin (acrylic resin).

See also Fig. 3, the LGP 21 of present embodiment mainly has an exiting surface 23, a reflecting surface 25 and a breach 26.This reflecting surface and the 23 subtend settings of this exiting surface, and this reflecting surface comprises a curved surface 24.This breach 26 is arranged at the side of this LGP 21.The only single side of the LGP 21 of present embodiment has breach 26, and this breach 26 includes one first plane 27 and one second plane 28, and this first plane 27 is connected with this exiting surface 23, and this second plane 28 is connected with this curved surface 24.Breach 26 is equipped with most light emitting diodes 22, and the depth H of breach 26 is slightly larger than the height h of light emitting diode 22 in the present embodiment, therefore, light emitting diode 22 can be placed in the breach 26 fully, and can not increase the volume that whole backlight module 20 occupies in addition.The light emitting diode 22 of present embodiment is attached at LGP 21, to reduce loss of light intensity.

In the backlight module 20 of present embodiment, the reflecting surface 25 of LGP 21 can optionally be provided with site (not shown) or reflecting layer (not shown).In the present embodiment, the reflecting surface 25 of LGP 21 optionally forms the site with mode of printing or utilizes modes such as sandblast, etching, cutting to make reflecting surface 25 form coarse surface, with the light in the scattering importing LGP 21.The reflecting surface 25 of present embodiment is to form the site (not shown) with mode of printing.In the present embodiment, the reflecting layer (not shown) can be a metal level or that is deposited under the reflecting surface 25 and is arranged at film under the reflecting surface 25.Reflector plate under the reflecting surface 25 of present embodiment is the aluminum metal layer (not shown) that is deposited under the reflecting surface 25.

In addition, in the present embodiment, on the exiting surface 23 of LGP 21, optionally dispose two diffusion sheets 29,31 and a prismatic lens 30, with the bright dipping of homogenising backlight module 20.

Therefore, when the incident ray of light emitting diode 22 enters LGP 21 inside, most incident ray can be beaten on the curved surface 24 of LGP 21 earlier, these curved surface 24 meeting total reflection incident raies, reduce scattering and disappearing of incident ray by this, the scatter incident light line makes the light that imports LGP 21 more even, and the light of importing is used more effectively simultaneously.Then, the light that imports in the LGP 21 can be done the total reflection action repeatedly in LGP 21, destroy total reflection during site (not shown) on the reflecting surface 25 that runs into LGP 21, allow exiting surface 23 bright dippings of light from LGP 21, pass through blooming piece homogenising bright dippings such as diffusion sheet 29,31 and prismatic lens 30 at last again, can obtain 20 bright dippings of the good backlight module of the briliancy and the uniformity.In the present embodiment, the curved surface 24 of LGP 21 is a smooth surface, can obtain reflecting effect preferably.

See also table 1, be the backlight module 20 of existing backlight module 10 (consulting Fig. 1) and present embodiment, under same parameter condition, make analog result with the light that the optics simulation software is done.

Table 1

The backlight module of embodiment one	Existing backlight module
The backlight module of embodiment one	Existing backlight module	The center briliancy	The center briliancy

6555nit	2410nit
6555nit	2410nit	Integral brightness	Integral brightness
5143nit	2270nit	Integral brightness	Integral brightness

As shown in Table 1, compared to existing backlight module 10 (consulting Fig. 1), the backlight module 20 of present embodiment increases taking up room of whole backlight module except avoiding light emitting diode 22, and can increase the briliancy and the uniformity of backlight module.

Fig. 4 is the schematic side view of the liquid crystal indicator of employing present embodiment backlight module 20.As shown in Figure 4, backlight module 20 is sides that are arranged at display panels, makes the exiting surface 23 of display panels 60 adjacent back optical modules 20.Therefore, the bright dipping of backlight module 20 can enter display panels 60, to provide display panels uniform light source.

Embodiment two

Backlight module of the present utility model, visual LGP size or briliancy demand and do various changes and modification.See also the stereogram of Fig. 5 backlight module, the structure and the content shown in the embodiment one of the backlight module 40 of present embodiment are roughly the same, its difference only is that the LGP 41 of the backlight module 40 of present embodiment has two

breach

42,43 that lay respectively at the limit, two opposite sides of LGP 41, and all the other structures are all identical with embodiment one.

Same, the backlight module 40 of present embodiment can avoid light emitting diode 44 to increase taking up room of whole backlight module, and can increase the briliancy and the uniformity of backlight module.

Embodiment three

Backlight module of the present utility model, visual LGP size or briliancy demand and do various changes and modification.See also the stereogram of Fig. 6 backlight module 50, the structure and the content shown in the embodiment one of the backlight module 50 of present embodiment are roughly the same, its difference only is most breach 52 of LGP 51 side tools of the backlight module 50 of present embodiment, and each breach 52 is equipped with a light emitting diode 53, and all the other structures are all identical with embodiment one.

Same, the backlight module 50 of present embodiment can avoid light emitting diode 53 to increase taking up room of whole backlight module, and can increase the briliancy and the uniformity of backlight module.

The foregoing description is only given an example for convenience of description, and the interest field that the utility model is advocated should be as the criterion so that claim is described certainly, but not only limits to the foregoing description.

Claims

1. backlight module comprises:

One LGP is characterized in that comprising:

One exiting surface;

One reflecting surface is and this exiting surface subtend setting that this reflecting surface comprises a curved surface; And

At least one breach is arranged at a side of this LGP, and this breach comprises one first plane and one second plane, and wherein this first plane is connected with this exiting surface, and this second plane is connected with this curved surface; And

One light source is in this breach of ccontaining this LGP.

2. backlight module as claimed in claim 1 is characterized in that, this light source is a light emitting diode.

3. backlight module as claimed in claim 1 is characterized in that, a degree of depth of this breach is more than or equal to a height of this light source.

4. backlight module as claimed in claim 1 is characterized in that, the single side of this LGP has this breach.

5. backlight module as claimed in claim 1 is characterized in that, two relative sides of this LGP have this breach.

6. backlight module as claimed in claim 1 is characterized in that this backlight module also comprises at least one optical diaphragm group, is disposed on this exiting surface of this LGP.

7. backlight module as claimed in claim 6 is characterized in that, this optical diaphragm group is prismatic lens, diffusion sheet or its combination.

8. backlight module as claimed in claim 1 is characterized in that, the material of this LGP is acrylic resin or polycarbonate resin.

9. backlight module as claimed in claim 1 is characterized in that, this backlight module is the side entrance back module.