CN102352985A

CN102352985A - Backlight module

Info

Publication number: CN102352985A
Application number: CN2011102174659A
Authority: CN
Inventors: 黄国权; 陈宏亮
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2011-06-01
Filing date: 2011-08-01
Publication date: 2012-02-15
Anticipated expiration: 2031-08-01
Also published as: TW201250344A; CN102352985B; TWI440941B

Abstract

The invention discloses a backlight module, which comprises a back plate, a plurality of light emitting diodes, a light guide plate, at least one positioning piece and a plurality of first buffer pieces. The back plate is provided with four inner walls, and the four inner walls enclose an accommodating space. The light emitting diode is arranged on one inner wall, and the light guide plate is arranged in the accommodating space. The light guide plate has a light incident surface facing the inner wall on which the light emitting diodes are arranged. The positioning piece is arranged in the accommodating space and is positioned between the light guide plate and the inner wall provided with the light emitting diode. The first buffer parts are respectively arranged between the light guide plate and the inner wall which is positioned at the other side relative to the light emitting diode and is adjacent to the corner. The rigidity of the first buffer piece is smaller than that of the positioning piece.

Description

Backlight module

Technical field

The present invention relates to a kind of backlight module, and particularly relate to a kind of LGP of avoiding because of the wound backlight module of light source of expansion.

Background technology

(liquid crystal display LCD) mainly is made up of a liquid crystal panel and a backlight module LCD.It should be noted that because the liquid crystal itself that is injected in the liquid crystal panel can be not luminous, therefore, must see through the area source that backlight module provided and light liquid crystal panel, so that LCD reaches the effect of demonstration.Hence one can see that, and backlight module is being played the part of considerable role in LCD.

Backlight module can be divided into direct type backlight module and lateral incident type backlight module according to its configured light sources position.With the lateral incident type backlight module, because present display module is all towards the trend development of slimming, so the also slimming thereupon of the thickness of LGP.Yet; Because LGP is easily because of moisture absorption or be heated and expand; Therefore how to avoid striking light source behind the LGP prolonged expansion and cause light source to damage; Or thin light guide panel is out of shape because of the not enough lateral compression that after being heated, receives other elements of mechanical strength, is the problem of desiring most ardently solution at present.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of backlight module, its light source can avoid sustaining damage when the LGP prolonged expansion.

The present invention proposes a kind of backlight module, comprises backboard, a plurality of light emitting diode, LGP, at least one keeper and a plurality of first bolster.Backboard has first inwall, second inwall, the 3rd inwall and the 4th inwall; Wherein first inwall is with respect to second inwall; The 3rd inwall is with respect to the 4th inwall, and the 3rd inwall and second inwall intersect at first corner, and the 4th inwall and second inwall intersect at second corner.And first inwall, second inwall, the 3rd inwall and the 4th inwall surround an accommodation space.

These light emitting diodes are to be disposed on first inwall, and LGP then is to be disposed in the accommodation space.And LGP has the incidence surface with respect to first inwall.Keeper is to be arranged in the accommodation space, and between the LGP and first inwall.These first bolsters then are to be disposed at respectively between the LGP and second inwall, and contiguous first corner and second corner.Wherein, the rigidity of first bolster is less than the rigidity of keeper.

In one embodiment of this invention, above-mentioned backlight module more comprises a plurality of second bolsters, and these second bolsters are to be configured in respectively between the 3rd inwall and the 4th inwall of LGP and backboard, and contiguous above-mentioned first corner and second corner.And the rigidity of these second bolsters is less than the rigidity of above-mentioned keeper.

In one embodiment of this invention, first bolster and second bolster in contiguous above-mentioned first corner are connected with each other, and first bolster and second bolster in contiguous above-mentioned second corner are connected with each other.

In one embodiment of this invention, first bolster and second bolster in contiguous above-mentioned first corner are formed in one, and first bolster and second bolster in contiguous above-mentioned second corner are formed in one.

In one embodiment of this invention, above-mentioned each first bolster comprises body and segment difference section, and the segment difference section is between body and above-mentioned LGP.

In one embodiment of this invention, above-mentioned each first bolster has first surface, and above-mentioned LGP has exiting surface, and the first surface of first bolster is roughly parallel to exiting surface, and first surface has at least one groove.

In one embodiment of this invention, above-mentioned backlight module more comprises circuit board and connector.Circuit board is attached on first inwall of backboard, and above-mentioned these light emitting diodes are disposed on the circuit board and with it and are electrically connected.Connector then is to be disposed on the circuit board and to be connected to light emitting diode.And connector is between LGP and circuit board.

In one embodiment of this invention, above-mentioned keeper comprises sheet metal, is arranged between above-mentioned connector and the LGP.

In one embodiment of this invention, the corner of contiguous first inwall of above-mentioned LGP has breach, and above-mentioned keeper correspondence breach and between LGP and the 3rd inwall or the 4th inwall so far.

Backlight module of the present invention is the location of accomplishing LGP through different keeper of rigidity and bolster; And the keeper that rigidity is bigger is between LGP and light source; Therefore can avoid LGP when moisture absorption or expanded by heating, clash into light source and cause LGP or light source damages, also can avoid LGP when doing impact test, wound light source and LGP.The active force that the less bolster of rigidity then can be bestowed in response to LGP when LGP moisture absorption or expanded by heating and crimp are out of shape because of receiving lateral compression power when expanding to avoid LGP.

For allow above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter specially lifts preferred embodiment, and cooperates appended accompanying drawing, elaborate as follows.

Description of drawings

Fig. 1 be one embodiment of the invention a kind of backlight module on look sketch map;

Fig. 2 is the side view of the backlight module of Fig. 1;

Fig. 3 be another embodiment of the present invention a kind of backlight module on look sketch map.

The main element description of reference numerals

100: backlight module

110: backboard

111: the first inwalls

112: the second inwalls

113: the three inwalls

114: the four inwalls

115: accommodation space

120: light emitting diode

122: circuit board

124: connector

130: LGP

132: incidence surface

134: exiting surface

136: breach

140: keeper

150: the first bolsters

152,162: body

154,164: the segment difference section

155,156,166: the surface

157,167: groove

160: the second bolsters

170: the glue frame

C1: first corner

C2: second corner

The specific embodiment

Fig. 1 be one embodiment of the invention a kind of backlight module on look sketch map, Fig. 2 then is the side view of the backlight module of Fig. 1.Please earlier with reference to Fig. 1, backlight module 100 comprises backboard 110, a plurality of light emitting diode 120, LGP 130, at least one keeper 140 and a plurality of first bolster 150.Backboard 110 has first inwall 111, second inwall 112, the 3rd inwall 113 and the 4th inwall 114; Wherein first inwall 111 is with respect to second inwall 112; The 3rd inwall 113 is with respect to the 4th inwall 114; And the 3rd inwall 113 and second inwall 112 intersect at the first corner C1, and the 4th inwall 114 and second inwall 112 intersect at the second corner C2.And first inwall 111, second inwall 112, the 3rd inwall 113 and the 4th inwall 114 surround an accommodation space 115.

Please be simultaneously with reference to Fig. 1 and Fig. 2, these light emitting diodes 120 are to be disposed on first inwall 111 of backboard 110.In detail, these light emitting diodes 120 are to be disposed on the circuit board 122, and are electrically connected to circuit board 122, and circuit board 122 is to be attached on first inwall 111.On the other hand, 122 of circuit boards are to be electrically connected to connector 124, to be electrically connected with external circuit through connector 124.In the present embodiment, connector 124 is to be configured on the backboard 110 and contiguous first inwall 111.In detail, connector 124 is disposed on the circuit board 122 and is electrically connected to light emitting diode 120, and connector 124 is between LGP 130 and circuit board 122.

LGP 130 is to be disposed in the accommodation space 115, and has the incidence surface 132 with respect to first inwall 111.The light that light emitting diode 120 is sent promptly is via incidence surface 132 incident LGPs 130, to convert the light that light emitting diode 120 is sent into the area source outgoing through LGP 130.Specifically, LGP 130 also has the exiting surface 134 adjacent with incidence surface 132, promptly is via exiting surface 134 outgoing and be incident upon LGP 130 inner light.

Keeper 140 is to be arranged in the accommodation space 115, and between the LGP 130 and first inwall 111, thereby can avoid LGP 130 to clash into to light emitting diode 120 because of influenced by external force to move towards first inwall 111, damages to prevent light emitting diode 120.In the present embodiment, keeper 140 can be a cylinder.Perhaps, keeper 140 also can be the sheet metal that is arranged between connector 124 and the LGP 130, causes connector 124 to damage to avoid LGP 130 bump connectors 124.

What deserves to be mentioned is that the corner of the LGP 130 of present embodiment for example is to have breach 136, and keeper 140 promptly is a corresponding breach 136 and between LGP 130 and the 3rd inwall 113 or LGP 130 and the 4th inwall 114.

First bolster 150 is to be disposed between second inwall 112 of LGP 130 and backboard 110, and the contiguous first corner C1 and the second corner C2.Specifically, the rigidity of first bolster 150 is less than the rigidity of keeper 140.In the present embodiment, the material of keeper 140 for example is a metal, and the material of first bolster 150 then for example is rubber or other pliability materials.

Hold the above, backlight module 100 is through the keeper 140 and first bolster 150 LGP 130 to be positioned between first inwall 111 and second inwall 112.And; Owing to be provided with the big and on-deformable keeper 140 of rigidity between LGP 130 and the light emitting diode 120; Then be to be provided with to have flexual first bolster 150 between the LGP 130 and second inwall 112; Therefore when LGP 130 expanded because of the temperature rising of environment of living in, LGP 130 was understood the direction prolonged expansion of court's second inwall 112 and is pushed first bolster 150.Hence one can see that; Even LGP 130 produces the situation of expanding with heat and contract with cold because of the variation of residing environment temperature; Still can LGP 130 be positioned between first inwall 111 and second inwall 112 of backboard through the keeper 140 and first bolster 150; Avoid LGP 130 to produce excessive displacement, and then keep the bright dipping quality of backlight module 100.

What deserves to be mentioned is; For LGP 130 flexibly being fixed between the 3rd inwall 113 and the 4th inwall 114; The backlight module 100 of present embodiment can also comprise a plurality of second bolsters 160; It is disposed at respectively between LGP 130 and the 3rd inwall 113 and reaches between the 4th inwall 114, and is respectively adjacent to the first corner C1 and the second corner C2.And the rigidity of second bolster 160 is also less than the rigidity of keeper 130.As shown in Figure 1, first bolster 150 and second bolster 160 of the contiguous first corner C1 are connected with each other, and first bolster 150 and second bolster 160 of the contiguous second corner C2 also are connected with each other.And in the present embodiment, first bolster 150 and second bolster 160 that link to each other can be to process with integrated mode.

On the other hand, first bolster 150 of present embodiment for example is to be made up of

body

152 and 154 of segment difference sections, and likewise, second bolster 160 also can be to be made up of body 162 and 164 of segment difference sections.Segment difference section 154 is between body 152 and LGP 130, and 164 of segment difference sections are between body 162 and LGP 130.In detail, on the direction of the exiting surface 134 of vertical LGP 130, the height of segment difference section 154 and segment difference section 164 for example is to be lower than body 152 and body 162 respectively.

As shown in Figure 2, backlight module 100 also includes the glue frame 170 that is sticked on the backboard 110 usually, so that LGP 130 and other blooming pieces (figure does not show) that is positioned on the LGP 130 are fixed in accommodation space 115.In the present embodiment, when LGP 130 pushed first bolster 150 because of moisture absorption or expanded by heating, can there be protuberance slightly segment difference section 154 because of stress deformation causes its surface that is parallel to exiting surface 134 155.Yet because segment difference section 154 is spaced a distance with glue frame 170, even segment difference section 154 makes surface 155 protuberances because of being squeezed, surface 155 does not contact to glue frame 170 yet, so can keep the intensity that engages between glue frame 170 and the backboard 110.Likewise, the segment difference section 164 of second bolster 160 also has identical functions.In other words, after first bolster 150 of present embodiment and second bolster 160 can avoid it to be out of shape being squeezed, glue frame 170 is bestowed non-active force as expected and made glue frame 170 separate with backboard 110.

Specifically; In another embodiment of the present invention; As shown in Figure 3; Also can be respectively on the surface 166 of the surface 156 of first bolster 150 and second bolster 160, form groove 157 and groove 167, with the phenomenons of avoiding first bolster 150 when receiving the extruding of LGP 130, to cause surface 156 and surface 166 to produce protuberance.At this, surface 156 and surface 166 are the exiting surfaces 134 that are roughly parallel to LGP 130.In detail, groove 157 and groove 167 can be the holes that runs through first bolster 150 and second bolster 160 respectively, also can be respectively the hole of the degree of depth less than the thickness of first bolster 150 and second bolster 160.The preset mechanical strength that the degree of depth of groove 157 and groove 167 can be looked first bolster 150 and second bolster 160 respectively decides, and the present invention does not do any qualification at this.In present embodiment, groove 157 and groove 167 communicate with each other, and also can make groove 157 and groove 167 independently of one another according to actual demand.

It should be noted that; For making accompanying drawing comparatively succinctly understandable; Fig. 1 and Fig. 3 are that example is done above-mentioned explanation with first bolster 150 and second bolster 160 of the contiguous second corner C2 only; But one of ordinary skill in the art should be understood that first bolster 150 of the contiguous first corner C1 and second bolster 160 and also can be designed to the section of having difference or groove.

In sum, in backlight module of the present invention, be to be disposed on first inwall of backboard as the light emitting diode of light source, and be provided with keeper between the LGP and first inwall, then be provided with bolster between second inwall of LGP and backboard.Because the rigidity of keeper greater than the rigidity of bolster, therefore when LGP moisture absorption or expanded by heating, can avoid LGP towards the light emitting diode prolonged expansion, so that LGP pushes bolster towards the opposite side prolonged expansion.Because the rigidity of bolster is enough little, can be out of shape in response to suffered active force, therefore can push bolster because of moisture absorption or expanded by heating when LGP, avoid LGP to receive lateral compression power and be out of shape.And follow-up LGP Yin Wendu descends and when being contracted to life size, the issuable displacement of LGP is minimum, therefore can make backlight module have stable bright dipping quality.

In addition; From the above, backlight module of the present invention is the location of accomplishing LGP through keeper and bolster, so the LGP in the backlight module of the present invention need not have the design of lug; Can avoid light at the lug place optically focused, and then promote the outgoing light homogeneity of backlight module.

Though combined above preferred embodiment to disclose the present invention; Yet it is not in order to limit the present invention; Any one of ordinary skill in the art are not breaking away from the spirit and scope of the present invention; Can do a little change and retouching, so protection scope of the present invention should be as the criterion with the scope that claim was defined of enclosing.

Claims

1. backlight module comprises:

Backboard; Have one first inwall, one second inwall, one the 3rd inwall and one the 4th inwall; Wherein this first inwall is with respect to this second inwall; The 3rd inwall is with respect to the 4th inwall; And the 3rd inwall and this second inwall intersect at one first corner; The 4th inwall and this second inwall intersect at one second corner, and this first inwall, this second inwall, the 3rd inwall and the 4th inwall surround an accommodation space;

A plurality of light emitting diodes are disposed on this first inwall;

LGP is disposed in this accommodation space, and this LGP has an incidence surface, and this incidence surface is with respect to this first inwall;

At least one keeper is arranged in this accommodation space, and between this LGP and this first inwall; And

A plurality of first bolsters are disposed at respectively between this LGP and this second inwall, and contiguous this first corner and this second corner, and wherein the rigidity of these first bolsters is less than the rigidity of this keeper.

2. backlight module as claimed in claim 1; Also comprise a plurality of second bolsters; Be disposed at respectively between this LGP and the 3rd inwall and this LGP and the 4th inwall; And be respectively adjacent to this first corner and this second corner, and the rigidity of these second bolsters is less than the rigidity of this keeper.

3. backlight module as claimed in claim 2, wherein this first bolster and this second bolster in contiguous this first corner are connected with each other, and this first bolster and this second bolster in contiguous this second corner are connected with each other.

4. backlight module as claimed in claim 3, wherein this first bolster and this second bolster in contiguous this first corner are formed in one, and this first bolster and this second bolster in contiguous this second corner are formed in one.

5. backlight module as claimed in claim 1, wherein respectively this first bolster comprises a body and a segment difference section, and this segment difference section is between this body and this LGP.

6. backlight module as claimed in claim 1, wherein respectively this first bolster has a first surface, and this LGP has an exiting surface, and this first surface is roughly parallel to this exiting surface, and this first surface also has at least one groove.

7. backlight module as claimed in claim 1 also comprises:

Circuit board is attached on this first inwall of this backboard, and said light emitting diode is disposed on this circuit board and with it and is electrically connected; And

Connector is disposed on this circuit board and is electrically connected to these light emitting diodes, and this connector is between this LGP and this circuit board.

8. backlight module as claimed in claim 7, wherein this keeper comprises a sheet metal, is arranged between this connector and this LGP.

9. backlight module as claimed in claim 1, wherein the corner of contiguous this first inwall of this LGP has a breach, and this keeper corresponds to this breach and between this LGP and the 3rd inwall or this LGP and the 4th inwall.