CN104297998B

CN104297998B - Backlight module

Info

Publication number: CN104297998B
Application number: CN201410492034.7A
Authority: CN
Inventors: 陈明伦; 徐明君; 吕秉伦
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2014-07-18
Filing date: 2014-09-23
Publication date: 2017-01-04
Anticipated expiration: 2034-09-23

Abstract

The invention discloses a backlight module, which comprises a light guide plate and an optical adhesive tape. The light guide plate is provided with a through groove, a side surface, a first surface and a second surface which are opposite. The side surface is connected between the first surface and the second surface, the penetrating groove is positioned on the side edge of the light guide plate, and a first opening, a second opening and a third opening are respectively formed on the first surface, the second surface and the side surface. The optical adhesive tape is provided with a continuous part and two wing parts, the continuous part is attached to the second surface and exposes the third opening, the two wing parts extend from two ends of the continuous part and around the edge direction of the outline of the third opening and extend the edges of the second opening and the first opening to be attached to the side surface and the first surface, and the two wing parts are positioned on two sides of the first opening on the first surface, so that the phenomenon of spraying bright lines caused by the damage of the optical adhesive tape is avoided, and the maintenance cost can be further reduced.

Description

Backlight module

Technical field

The invention relates to a kind of backlight module, a kind of backlight mould improving injection bright line phenomenon Block.

Background technology

In the streets liquid crystal indicator includes display panels (LCD Panel) and backlight module, wherein carries on the back Optical module is arranged under display panels and in order to provide area source to display panels.Therefore, the back of the body The quality of the area source that optical module is provided is closely bound up with the display quality of liquid crystal indicator.Refer to figure 1, existing backlight module includes backboard 90, light guide plate 91 and light source 92, and light guide plate 91 is arranged in backboard On 90, and light guide plate 91 has incidence surface 911 and exiting surface 912, and the light that wherein light source 92 sends can be injected Incidence surface 911 and via exiting surface 912 outgoing to display panels.

Wherein, for lightguide plate fixing 91, hole 913, location can be provided with in light guide plate 91 adjacent to border, for the back of the body The locating dowel 901 of plate 90 wears to make light guide plate 91 fix, and thereby makes guide-lighting 91 plates to shake easily Dynamic skew, results even in light guide plate and damages.But light source 92 emits beam and reflexes to the location of light guide plate 91 Time at hole 913, it can produce the phenomenon of injection bright line (Mura) at hole 913, location, causes liquid crystal Showing that the show image of the visible area of panel produces fuzzy, the display with narrow frame design especially is particularly evident.

Settling mode the most in the streets is to paste the black belt of an extinction to reduce injection at hole 913, location The phenomenon of bright line.After only this mode uses a period of time, locating dowel can be because of the shifting of liquid crystal indicator Move and rock, cause black belt to be damaged because locating dowel is rocked, cause display taste to reduce.

Summary of the invention

Because above-mentioned problem, the present invention provides a kind of backlight module, via destroying backlight module part district The light total reflection angle in territory, and be avoided that and recur injection bright line (Mura) because of fixing rocking of post Phenomenon, thereby can reduce maintenance cost.

The present invention provides a kind of backlight module, comprises: light guide plate and optical adhesive tape.Light guide plate have run through groove, Side surface and relative first surface and second surface.Wherein side surface is connected to first surface and the second table Between face, run through groove and be positioned at the side of light guide plate, and in first surface, second surface and side surface difference Form the first opening, the second opening and the 3rd opening.Optical adhesive tape has continuous portion and two alar parts, Qi Zhonglian Continuous portion is attached at second surface, and exposes the 3rd opening, and two alar parts be from two ends in continuous portion with around 3rd opening contours edge direction extends, and is attached at side surface along the edge of the second opening and the first opening With first surface, and two alar parts are in two sides of the first opening on first surface.

Understanding via said structure, optical adhesive tape is attached at the first surface of light guide plate, second surface and side table Face, and around the first opening, the second opening and the periphery of the 3rd opening, in other words, optical adhesive tape attaches The periphery running through groove in light guide plate.Therefore the fixing post of display is placed in when running through groove, because of optical cement Band is only located at the periphery running through groove, so fixing post contacts without any with optical adhesive tape, the most therefore fix post in When display moves, optical adhesive tape will be made to damage because of rocking, consequently, it is possible to because of optical adhesive tape not Can damage because fixing post rocks, run through the optical adhesive tape of groove periphery can maintain interference light line reflection so being positioned at Effect, and then avoid light produce injection bright line phenomenon, the most therefore can reduce maintenance cost.

Accompanying drawing explanation

Fig. 1 is a three-dimensional signal exploded view of the backlight module of prior art.

Fig. 2 is a three-dimensional signal exploded view of backlight module one embodiment of the present invention.

Fig. 3 is light guide plate and a top perspective view of optical adhesive tape of the present invention.

Fig. 4 is light guide plate and a top view of optical adhesive tape of the present invention.

Fig. 5 is light guide plate and a perspective bottom view of optical adhesive tape of the present invention.

Fig. 6 is light guide plate and a upward view of optical adhesive tape of the present invention.

Fig. 7 is a schematic diagram of the optical adhesive tape of backlight module of the present invention.

Fig. 8 is a use schematic diagram of another embodiment of reflector plate of the present invention.

Fig. 9 is a three-dimensional signal exploded view of another embodiment of backlight module of the present invention.

10 light guide plates

11 run through groove

12 central areas

13 periphery districts

14 datum lines

101 first surfaces

102 second surfaces

103 side surfaces

104 sensitive surfaces

111 first openings

112 second openings

113 the 3rd openings

20 optical adhesive tape

21 continuous portions

22 alar parts

23 protuberances

221 first broken lines

222 second broken lines

30 light sources

40 backboards

41 arrange face

42 locating dowels

50 reflector plates

90 backboards

901 locating dowels

91 light guide plates

92 light sources

911 incidence surfaces

912 exiting surfaces

913 hole, location

Detailed description of the invention

Fig. 2 is an exploded view of backlight module one embodiment of the present invention.Refer to shown in Fig. 2, backlight Module comprises light guide plate 10, optical adhesive tape 20, light source 30 and backboard 40, and optical adhesive tape 20 is arranged at light guide plate The surface of 10, light source 30 is positioned at light guide plate 10 side, and backboard 40 houses light guide plate 10.

Fig. 3 is light guide plate 10 and a top perspective view of optical adhesive tape 20 of the present invention.Fig. 4 is leading of the present invention Tabula rasa 10 and a top view of optical adhesive tape 20.Fig. 5 is the light guide plate 10 and the one of optical adhesive tape 20 of the present invention Perspective bottom view.Fig. 6 is light guide plate 10 and a upward view of optical adhesive tape 20 of the present invention.Wherein, Fig. 3-6 In only omit light source 30 and the backboard 40 of backlight module.

Referring to shown in Fig. 2-6, light guide plate 10 has and runs through groove 11, side surface 103 and the first relative table Face 101 and second surface 102, wherein side surface 103 is connected between first surface 101 and second surface 102. Run through groove 11 and be positioned at a side of light guide plate 10, and in first surface 101, second surface 102 and side surface 103 Form the first opening the 111, second opening 112 and the 3rd opening 113 respectively；It is to say, light guide plate 10 in Side surface 103 indent is formed and runs through groove 11, runs through groove 11 two ends and is respectively the first opening 111 and the second opening 112, and the 3rd opening 113 two ends adjoin the first opening 111 and the second opening 112, again the first opening 111 respectively Being positioned at first surface 101, the second opening 112 is positioned at second surface 102, and the 3rd opening 113 is positioned at side surface 103.Wherein, run through the aperture of groove 11 between 3 millimeters to 4 millimeters, in the present embodiment, run through groove 11 Aperture preferably select 3.6 millimeters, the only not so limited system of the present invention.

Wherein, referring to Fig. 4, light guide plate 10 comprises central area 12 and periphery district 13, periphery district 13 around in The periphery in district 12, centre.Run through groove 11 and be positioned at periphery district 13, its first opening 111 and profile of the second opening 112 Edge is less than central area 12；It is to say, the contour line only position that the first opening 111 is on first surface 101 In periphery district 13, and the border of central area 12 and periphery district 13 will not be touched, and the second opening 112 is in the The contour line on two surfaces 102 is also corresponding is positioned at periphery district 13, and the second opening 112 will not touch the most accordingly And the border in central area 12 and periphery district 13.Therefore the contour edge running through groove 11 is only located at periphery district 13 In, the border of central area 12 and periphery district 13 will not be contacted, and run through the first opening 111 and second of groove 11 The profile of opening 112 is respectively positioned in periphery district 13.

Referring to Fig. 2, backboard 40 comprises the face of setting 41 and locating dowel 42, and locating dowel 42 is positioned at the face of setting In 41 and run through in groove 11 in order to be arranged in, when light guide plate 10 is positioned on the face that arranges 41 of backboard 40, fixed Position post 42 is penetrated by the second opening 112 running through groove 11, and is passed by the first opening 111, and locating dowel 42 Sidewall be resisted against the joint face that the first opening 111 is connected with the second opening 112.Consequently, it is possible to light guide plate 10 utilize the locating dowel 42 running through groove 11 and backboard 40 to fix, and locating dowel 42 because of corresponding to run through groove 11 and only It is positioned at the periphery district 13 of light guide plate 10, thereby, is avoided light guide plate 10 and shifts, and run through groove 11 and can avoid Have influence on light guide plate 10 and guide the effect of light in central area 12, that is avoid display taste to reduce.

Furthermore, light source 30 is arranged at the sensitive surface 104 (as shown in Figure 2) of light guide plate 10, sensitive surface 104 with Side surface 103 adjoins, and when light source 30 emits beam, first surface 101 is exiting surface；It is to say, Light source 30 arranges neighbouring sensitive surface 104, and the light that light source 30 sends injects sensitive surface 104, via light guide plate After 10 internal reflections, then by first surface 101 as exiting surface to emit beam equably, it is right to be thereby available for The display panels that should arrange is shown picture, for viewing.It addition, in the present embodiment, light source 30 is multiple LED, and the present invention is not so limited.

Also, light guide plate 10 has strip micro structure (not shown), and the micro-knot of strip in first surface 101 Structure is vertical with sensitive surface 104, and light source 30 emits beam and enters sensitive surface 104, thereby utilizes strip micro structure to obtain The normal direction of exiting surface (first surface 101) is focused more in light guide plate 10 internal reflection with supply light Emit beam, thereby to heighten briliancy.

Fig. 7 is the schematic diagram of the optical adhesive tape 20 of backlight module of the present invention.Refer to shown in Fig. 7, optical adhesive tape 20 have continuous portion 21 and two alar parts 22.Portion 21 is attached at second surface 102 (as seen in figs. 5-6) continuously, And expose the 3rd opening 113.Two alar parts 22 from be attached at second surface 102 continuous portion 21 two ends with enclose Extend around the 3rd opening 113 contour edge, be further continued for extending and be attached at the second opening being positioned at side surface 103 112 and be positioned at the both sides of edges (as seen in figures 3-6) of the first opening 111 of first surface 101；It is to say, Optical adhesive tape 20 is attached at the periphery running through groove 11 of light guide plate 10, and from the second surface 102 of light guide plate 10 It is pasted to first surface 101 and comprises attaching side surface 103, that is optical adhesive tape 20 is only around in running through groove 11 Profile periphery or both sides and avoid running through groove 11, make to run through, in the middle of groove 11, not there is optical adhesive tape 20.

Furthermore, refer to shown in Fig. 5-6, optical adhesive tape 20 further includes protuberance 23, and protuberance 23 is formed at Optical adhesive tape 20 both sides and correspondence are attached at second surface 102；In other words, protuberance 23 is formed at alar part 22 And relative to the another side in continuous portion 21, and correspondence is attached at second surface 102, thereby enhancing beaming light is One surface 101 is positioned at the interference effect of the reflection running through groove 11 periphery, say, that when light source 30 sends light Line reflection, to when running through at groove 11 of light guide plate 10, can produce injection bright line (Mura) in running through at groove 11 Phenomenon, run through groove 11 periphery because attaching optical adhesive tape 20 to disturb light line reflection, and optical adhesive tape 20 attaches When second surface 102, extend interference range by protuberance 23, because protuberance 23 destroys light ahead of time Reflection path so that the neighbouring anaclasis running through groove 11 of first surface 101 can be entered by more serious destruction And the phenomenon making the first surface 101 as exiting surface more be reduced injection bright line produces.

Another in the present embodiment, optical adhesive tape 20 has the first broken line 221 and the second broken line 222 (such as Fig. 7 institute Show), it lays respectively on these alar parts 22, and the first broken line 221 correspondence respectively is positioned at first surface 101 and side Junction, surface 103, the second broken line 222 correspondence respectively is positioned at second surface 102 and side surface 103 junction, That is first broken line 221 be adjacent to the free end of alar part 22, the second broken line 222 is adjacent to connecting portion 21.Thereby Installing can be easy to paste, save and assemble man-hour.

Referring to shown in Fig. 4, light guide plate 10 has datum line 14, and datum line 14 is by the first opening The profile of 111 closest to central area 12 projecting point, two alar parts 22 of optical adhesive tape 20 are attached at the first table The scope in face 101 is less than datum line 14；In other words, datum line 14 cuts through dashing forward in the first opening 111 profile Go out a little, and datum line 14 be positioned at periphery district 13, therefore each alar part 22 of optical adhesive tape 20 corresponding to first The free end on surface 101 is not over datum line 14, that is the free end of each alar part 22 is between first surface 101 And between the junction of side surface 103 and datum line 14；Another in the present embodiment, first surface 101 and side table The junction in face 103 is parallel with datum line 14, and the present invention is not so limited.Furthermore, in the present embodiment, Projecting point to the beeline on the border of this central area 12 between 0.5 millimeter to 3 millimeter.

Furthermore, in the present embodiment, if optical adhesive tape 20 is not arranged at light guide plate 10, light is in leaded light The injection bright line length about 2-3 millimeter run through at groove 11 of plate 10, therefore, leads when optical adhesive tape 20 is arranged at During tabula rasa 10, and optical adhesive tape 20 in the area of second surface 102 more than being attached at the area of first surface 101 Time, when light guides in light guide plate 10, because optical adhesive tape 20 is relatively big in the area of second surface 102, make When obtaining ray guidance to second surface 102, the total reflection of light is the most destroyed, adds second surface 102 There is between first surface 101 a thickness distance, cause the phenomenon spraying bright line at first surface 101 More reduced；In other words, because optical adhesive tape 20 is attached at bigger former of the area of second surface 102 Cause, causes light in the most destroyed total reflection of second surface 102 so that the injection bright line of first surface 101 Phenomenon can reduce.Furthermore, it is right that optical adhesive tape 20 must extend to light guide plate 10 in the scope of second surface 102 Should be in the region of central area 12, the present invention is not for limit with this.

Another in the present embodiment, each alar part 22 of optical adhesive tape 20 is corresponding to the length of second surface, with each wing Portion 22 corresponds to the length of the intersection of datum line 14 to first surface 101 and side surface 103 between 0 millimeter extremely Between 2 millimeters, the only not so limited system of the present invention, can be according to the pore size running through groove 11 of light guide plate 10 The spray light bright line scope caused designs this length range.

Furthermore, in the present embodiment, the central area 12 of light guide plate 10 and the border in periphery district 13 are to datum line 14 Length between 1 millimeter to 4 millimeter, the only not so limited system of the present invention, can passing through according to light guide plate 10 Wear the spray light bright line scope that the pore size of groove 11 causes and design this length range.

Also, in the present embodiment, optical adhesive tape 20 is attached at the width of second surface 102 and is attached at first The width on surface 101 between 0.5 millimeter to 20 millimeter, the only not so limited system of the present invention, can be according to leading The spray light bright line scope that the pore size running through groove 11 of tabula rasa 10 causes designs this length range；Wherein optics The direction of the width of adhesive tape 20 is the direction of the air line distance of two protuberances 23, that is left as shown in Figure 5 Right horizontal direction.

Referring to shown in Fig. 2, backlight module includes that reflector plate 50, reflector plate 50 are arranged at side surface 103 Upper and be adjacent to two alar parts 22 one of them, the reflectance of reflector plate 50 is preferably less than or equal to optical adhesive tape The reflectance of 20；That is reflector plate 50 is positioned adjacent on the side surface of a wherein alar part 22 103, and warp It is not equal to optical adhesive tape 20 by the reflectance of reflector plate 50, thereby can be using light line reflection and be directed to as going out light The first surface 101 in face emits beam, so obtain this region briliancy, colourity and central area 12 possess extension Property distribution, with avoid light produce injection bright line phenomenon.Wherein, the reflectance of reflector plate 50 is less than In the reflectance of optical adhesive tape 20, its purpose is in order to avoid the brightness of the spray light bright line scope at optical adhesive tape 20 Cross bright.Another in the present embodiment, there is a gap, this clearance distance between reflector plate 50 and optical adhesive tape 20 Between 0 millimeter to 2 millimeter, only the present invention is not so limited.Reflector plate 50 in the present embodiment again Length more than 20 millimeters, only the present invention is not so limited.

It addition, reflector plate 50 preferably color selecting Lycoperdon polymorphum Vitt, its reflectance is whiter for little, and it is primarily due to The reflector plate 50 of white can cause the strongest total reflecting destructive, that is has the most short-range broken during light line reflection Bad, and then the brightest bright band can be caused to produce, say, that if reflector plate 50 uses white, it sprays light Brightness in the range of bright line can relatively use the brightness of the reflector plate 50 of Lycoperdon polymorphum Vitt to be height.

Furthermore, the material of reflector plate 50 selects non-metallic material, and its main cause is because metal material can be by light Line from side surface 103 toward the strength reflection of central area 12 direction of light guide plate 10, cause cause central area 12 can The brightness irregularities of vision area.

Fig. 8 is a use schematic diagram of another embodiment of the reflector plate 50 of the present invention.Refer to shown in Fig. 8, Reflector plate 50 also can be located at adjacent optical adhesive tape 20 and be positioned at the alar part 22 of opposite sides, and is attached at side table respectively On face 103, thereby can using light line reflection and be directed to the first surface 101 as exiting surface and emit beam, and Obtain this region briliancy, colourity possesses ductile distribution with central area, and then it is bright to avoid light to produce injection The phenomenon of line.

The backlight module constituted by said structure, is attached at light guide plate 10 through optical adhesive tape 20 correspondence First surface 101, second surface 102 and side surface 103, and optical adhesive tape 20 is respectively around the first opening 111, the second opening 112 and contour edge of the 3rd opening 113, thereby optical adhesive tape 20 will not be positioned at and run through Within groove 11, that is optical adhesive tape 20 will not be positioned at the first opening the 111, second opening 112 and the 3rd opening 113 Between；Consequently, it is possible to rocking and making optical adhesive tape 20 damage of locating dowel 42 can be avoided, and optical adhesive tape 20 It is maintained interference light line reflection, and then avoids light to produce the phenomenon of injection bright line, the most therefore can reduce dimension Accomplish this.

Fig. 9 is a three-dimensional signal exploded view of another embodiment of backlight module of the present invention.Refer to shown in Fig. 9, Light guide plate 10 further includes two and runs through groove 11, and optical adhesive tape 20 has two continuous portion 21 and three wings of respective amount Portion 22, thereby can house two locating dowels 50 of correspondence, say, that what the light guide plate 10 of the present invention can be corresponding Increase and run through groove 11, and optical adhesive tape 20 correspondence increases continuous portion 21 and alar part 22, thereby can house corresponding number The locating dowel 42 of amount, the not so limited system of the present invention.Lead consequently, it is possible to be attached at through optical adhesive tape 20 Tabula rasa 10 run through groove 11 periphery, rocking and making optical adhesive tape 20 damage of locating dowel 42, and optics can be avoided Adhesive tape is maintained interference light line reflection, and then avoids light to produce the phenomenon of injection bright line, the most therefore can drop Low maintenance cost.

Claims

1. a backlight module, it is characterised in that comprise:

One light guide plate, has one and runs through groove, a side surface and a relative first surface and one second Surface, wherein this side surface is connected between this first surface and this second surface, and this runs through groove and is positioned at The side of this light guide plate, and form one the respectively in this first surface, this second surface and this side surface One opening, one second opening and one the 3rd opening；And

One optical adhesive tape, has a continuous portion and two alar parts, and wherein this continuous portion is attached at this second table Face, and expose the 3rd opening, and this two alar part is opened with around the 3rd from two ends in this continuous portion Mouthful contour edge direction extends, and is attached at this side along the edge of this second opening Yu this first opening Surface and this first surface, and this two alar part is positioned at two sides of this first opening on this first surface.

2. backlight module as claimed in claim 1, it is characterised in that this backlight module includes a reflection Sheet, this reflector plate be arranged on this side surface and be adjacent to this two alar part one of them.

3. backlight module as claimed in claim 2, it is characterised in that the reflectance of this reflector plate is less than Reflectance equal to this optical adhesive tape.

4. backlight module as claimed in claim 2, it is characterised in that often this reflector plate and this optical cement Having a gap between band, this clearance distance is between 0 millimeter to 2 millimeter.

5. backlight module as claimed in claim 1, it is characterised in that this light guide plate comprises a central area With the periphery district around this central area, wherein this runs through groove and is arranged at this periphery district, and this first is opened The contour edge of mouth and this second opening is less than this central area.

6. backlight module as claimed in claim 5, further includes a datum line, by this first opening Profile is closest to a projecting point of this central area, and this two alar part is attached at the scope of this first surface not Exceed this datum line.

7. backlight module as claimed in claim 6, it is characterised in that this projecting point is to this central area Beeline is between 0.5 millimeter to 3 millimeter.

8. backlight module as claimed in claim 1, it is characterised in that this backlight module further includes a light Source, this light source is arranged at a sensitive surface of light guide plate, and this sensitive surface adjoins with this side surface, and works as light When source sends a light, this first surface is an exiting surface.

9. backlight module as claimed in claim 1, it is characterised in that this optical adhesive tape be attached at this The area on two surfaces is more than the area being attached at this first surface.

10. backlight module as claimed in claim 1, it is characterised in that this backlight module has a location Post, this locating dowel is placed in this and runs through groove.

11. backlight modules as claimed in claim 1, it is characterised in that this optical adhesive tape has one first Broken line and one second broken line, this first broken line correspondence respectively is positioned at this first surface and is connected with this side surface Place, this second broken line correspondence respectively is positioned at this second surface and this side surface junction.

12. backlight modules as claimed in claim 1, it is characterised in that this optical adhesive tape further includes two and dashes forward Go out portion, be attached at this second surface respectively, those protuberances be respectively formed in respectively this alar part and relative to The another side in this continuous portion.