CN102129098A - Light guiding plate, manufacturing method of light guiding plate and side emitting type backlight module - Google Patents
Light guiding plate, manufacturing method of light guiding plate and side emitting type backlight module Download PDFInfo
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- CN102129098A CN102129098A CN2011101052194A CN201110105219A CN102129098A CN 102129098 A CN102129098 A CN 102129098A CN 2011101052194 A CN2011101052194 A CN 2011101052194A CN 201110105219 A CN201110105219 A CN 201110105219A CN 102129098 A CN102129098 A CN 102129098A
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Abstract
The invention relates to a light guiding plate, a manufacturing method of the light guiding plate and a side emitting type backlight module. The light guiding plate provided in the invention comprises a first plastic optical layer, a second plastic optical layer and a plurality of light reflecting contents, wherein the first plastic optical layer has light transmission performance, and is provided with a first surface and a second surface which are opposite to each other; the first surface is provided with a miniature structure pattern; the second plastic optical layer is overlapped on the second surface; and a plurality of light reflecting contents are distributed in the second plastic optical layer. The invention has the following advantages that: a light guiding layer and a reflecting layer are integrated without any space therebetween so as to achieve the purpose of totally reflecting the light; besides, as the backlight module does not need additionally preparing individual subassemblies gaving reflecting function, the light non-uniform phenomenon can be avoided, thereby improving the illumination quality.
Description
Technical field
The present invention relates to a kind of Quartering shot type backlight module, relate in particular to light guide plate and manufacture method thereof in this backlight module.
Background technology
(design of the backlight module of decision LCD brightness is meticulous day by day for Liquid Crystal Display, LCD) universal day by day because LCD.Backlight module is divided into side-light type light inlet (edge lighting) and two kinds of straight-down negative light inlets (bottom lighting) according to the difference of light source incoming position, to provide LCD required area source.
The side light type back light module of prior art comprises light source, reflecting plate, light guide plate, diffusion sheet and prismatic lens or the like, wherein light source is positioned at the side of light guide plate, reflecting plate is positioned at the light guide plate below, and diffusion sheet and prismatic lens are positioned at the light guide plate top, and diffusion sheet is between prismatic lens and light guide plate.So, when the light of light source entered light guide plate inside, by the reflection of reflecting plate, light can be sent light guide plate towards the direction of diffusion sheet and prismatic lens, to form the briliancy uniform surface light source, provides LCD required brightness.Yet, because reflector plate is to utilize viscose to attach on the light guide plate, still possess the slight void that can't avoid between reflector plate and the light guide plate, still have the improvement space for the total reflection effect of light.In addition, because reflector plate attaches on the light guide plate, the area source of light guide plate will produce light non-uniform phenomenon (mura) because of reflector plate, reduce lighting quality.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of light guide plate, are intended to solve the above problems.
The present invention also provides the Quartering shot type that adopts above-mentioned light guide plate backlight module.
The present invention also provides above-mentioned manufacturing method of light conducting board.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
Light guide plate of the present invention comprises: one first plastic optics layer; The described first plastic optics layer tool light transmission with have relative first and second, this first mask has a micro structured pattern; One second plastic optics layer; Described second plastic optics is stacking closes in this second; And a plurality of smooth reflected content things; Described a plurality of smooth reflected content thing is distributed in this second plastic optics layer.
Quartering shot type backlight module of the present invention comprises: a backboard; One above-mentioned light guide plate; Described light guide plate is positioned on this backboard; One light source; Described light source is positioned at one of this light guide plate incidence surface; One prismatic lens; Described prismatic lens is positioned at one of this light guide plate exiting surface; An and diffusion sheet; Described diffusion sheet is between this light guide plate and this prismatic lens.
Method for manufacturing light guide plate of the present invention, realize by following steps:
Ejection formation one first plastic former and one second plastic former wherein have a plurality of smooth reflected content things in this second plastic former simultaneously; And
With this first plastic former and the common pressing and forming of this second plastic former is holistic light guide plate.
Compared with prior art, the invention has the beneficial effects as follows: an optical waveguide layer and a reflector layer are integrated, make no longer have the space between optical waveguide layer and the reflector layer, to satisfy the purpose of light total reflection; So, because backlight module no longer needs additionally to prepare the stand-alone assembly of tool reflection function, backlight module not only can be simplified the structure of backlight module, saves redundant space, also can reach the purpose that reduces cost; Simultaneously,, also can avoid producing the light non-uniform phenomenon, and then promote lighting quality because backlight module no longer needs additionally to prepare the stand-alone assembly of tool reflection function.
Description of drawings
Fig. 1 illustrates the process flow diagram of the method for making of light guide plate of the present invention.
Fig. 2 illustrates the equipment synoptic diagram in order to the method for making of carrying out Fig. 1.
Fig. 3 A illustrates the partial enlarged drawing of the regional M1 of light guide plate among Fig. 2.
Fig. 3 B illustrates the partial schematic diagram of the regional M2 of light guide plate among Fig. 2.
Fig. 3 C illustrates the partial schematic diagram of light guide plate in other embodiment.
Fig. 4 illustrates the cross-sectional schematic of Quartering shot type backlight module.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
The present invention, does not need additionally to prepare the stand-alone assembly of tool reflection function, and then reaches the purpose that reduces cost in order to simplify structure of back lighting module for disclosing the backlight module of a kind of light guide plate and this light guide plate of tool.
The present invention is for disclosing the backlight module of a kind of light guide plate and this light guide plate of tool, in order to eliminating the slight void between optical waveguide layer and reflector layer, and then reaches the purpose of light total reflection.
The present invention produces the purpose of light non-uniform phenomenon (mura) for disclosing the backlight module of a kind of light guide plate and this light guide plate of tool in order to elimination, and then promotes lighting quality.
The invention provides a kind of light guide plate, this light guide plate comprises one first plastic optics layer, one second plastic optics layer and a plurality of smooth reflected content thing.The first plastic optics layer has relative first and second.First mask has a micro structured pattern.Second plastic optics is stacking closes on second.Light reflected content thing is distributed in the second plastic optics layer inside.
In addition, in one embodiment, the second plastic optics layer jointlessly coincides in the first plastic optics layer second, wherein the deadlocked layer of tool not between the second plastic optics layer and the first plastic optics layer.
In another embodiment, the second plastic optics layer is by deadlocked stacking closing on the first plastic optics layer.In other embodiments, the first plastic optics layer and the identical material of the second plastic optics layer tool.
In other embodiments, the first plastic optics layer and the identical area of the second plastic optics layer tool.
In other embodiments, the thickness of the first plastic optics layer is more than 3～6 times of thickness of the second plastic optics layer.
In other embodiments, be distributed with the luminous reflectivity of the second plastic optics layer of light reflected content thing greater than the luminous reflectivity of the first plastic optics layer.
In other embodiments, the cumulative volume of these a little light reflected content things account for the second plastic optics layer volume 20%～50%.
In other embodiments, the material of the first plastic optics layer and the second plastic optics layer is polypropylene, acrylonitrile-styrene-butadiene copolymer, polyethylene terephthalate, polystyrene, polycarbonate, pi or polymethylmethacrylate or its combination.
In other embodiments, light reflected content thing is a metal powder.Further, the material of metal powder is silver, copper, gold, nickel, aluminium, tin, chromium, titanium, iron or its combination.
In other embodiments, light reflected content thing is the optical whitening agent particle.Further, the optical whitening agent particle is the combination of talan or talan and barium sulphate or titania and silicon dioxide.
In other embodiments, the second plastic optics layer that is distributed with light reflected content thing be white in color, silver color or gold.
In other embodiments, micro structured pattern comprises the structure of convex or concave.Further, the structure of micro structured pattern is sphere, " V " font, " U " font, square, rectangle, rhombus, smart circle, triangle, waveform or its combination.
In addition, this kind Quartering shot type backlight module comprises a backboard, a light guide plate, a light source, a prismatic lens and a diffusion sheet as above.Light guide plate is positioned on this backboard.Light source is positioned at the incidence surface of light guide plate.Prismatic lens is positioned at the exiting surface of light guide plate.Diffusion sheet is between light guide plate and prismatic lens.
The present invention also provides a kind of method for making of light guide plate, comprises step for by glue discharging mouth while ejection formation one first plastic former and one second plastic former, wherein is mixed with a plurality of smooth reflected content things in second plastic former; Then, be the light guide plate of an integral body with first plastic former and the common pressing and forming of second plastic former.
In one embodiment, when first plastic former and the common pressing and forming of second plastic former are the light guide plate of integral body, be with first plastic former and the common pressing and forming of second plastic former light guide plate for this reason by moulding roll extrusion wheels.
In other embodiments, after first plastic former and the common pressing and forming of second plastic former are the light guide plate of an integral body, by another moulding roll extrusion wheels, first plastic former is gone out a micro structured pattern away from a coining of second plastic former.
In other embodiments, the cumulative volume of these a little light reflected content things account for second plastic former volume 20%～50%.
In other embodiments, the material of first plastic former and second plastic former is polypropylene, acrylonitrile-styrene-butadiene copolymer, polyethylene terephthalate, polystyrene, polycarbonate, pi or polymethylmethacrylate or its combination.
In other embodiments, light reflected content thing is a metal powder.Further, the material of metal powder is silver, copper, gold, nickel, aluminium, tin, chromium, titanium, iron or its combination.
In other embodiments, light reflected content thing is the optical whitening agent particle.Further, the optical whitening agent particle is the combination of talan or talan and barium sulphate or titania and silicon dioxide.
See also shown in Fig. 1, Fig. 2 and Fig. 3 A～3B.Fig. 1 illustrates the process flow diagram of the method for making of light guide plate of the present invention.Fig. 2 illustrates the equipment synoptic diagram in order to the method for making of carrying out Fig. 1.Fig. 3 A illustrates the partial enlarged drawing of the regional M1 of light guide plate among Fig. 2.Fig. 3 B illustrates the partial enlarged drawing of the regional M2 of light guide plate among Fig. 2.
See also Fig. 1, provide a kind of method for making of light guide plate, comprise step:
Step (101): while ejection formation one first plastic former P11 and one second plastic former P21 wherein are mixed with a plurality of smooth reflected content things 400 in the second plastic former P21;
Step (102): with the first plastic former P11 and the common pressing and forming of the second plastic former P21 is the light guide plate 100 of an integral body;
Step (103): make the surface of a micro structured pattern 210 to light guide plate 100; And
Step (104): cooling light guide plate 100.
Among one of the present invention embodiment, above-mentioned method for making can adopt the dijection of Fig. 2 to go out moulding and press equipment 600, and dijection goes out moulding and press equipment 600 and comprises a feed portion 610, and add pressing die head 620 and moulding roll extrusion wheels 630.Feed portion 610 comprises one first feed chamber 611, one second feed chamber 613, one first heating spiral rod 612, one second heating spiral rod 614.First heating spiral rod 612 is connected first feed chamber 611 and is added pressing die head 620, in order to heating and transferring raw material to adding pressing die head 620.Second heating spiral rod 614 is connected second feed chamber 613 and is added pressing die head 620, in order to heating and transferring raw material to adding pressing die head 620.Moulding roll extrusion wheels 630 comprise mutually side by side 2 first moulding rolling wheels 631 and one second moulding rolling wheel 632 and mutually side by side two holders draw wheel 633.The surface of the second moulding rolling wheel 632 has a space pattern.
Please consult Fig. 1, Fig. 2 and Fig. 3 A simultaneously, when carrying out step (101): while ejection formation one first plastic former P11 and one second plastic former P21, first feed chamber 611 can be placed with the first sizing material P1.Second feed chamber 613 can be placed with the second sizing material P2, is mixed with a plurality of smooth reflected content things 400 in the second sizing material P2; Then, first heating spiral rod, 612 heating, the first sizing material P1, and guide the first sizing material P1 to adding in the pressing die head 620,614 heating of second heating spiral rod are mixed with the second sizing material P2 of light reflected content thing 400, and guide the second sizing material P2 to adding in the pressing die head 620; Then, the first sizing material P1 after the fusing and the second sizing material P2 that is mixed with light reflected content thing 400 shunt according to thickness and can output to the external world via adding one of pressing die head 620 glue discharging mouth 621 continuously adding pressing die head 620, with the continuous first plastic former P11 of ejection formation and be mixed with the second plastic former P21 of a plurality of smooth reflected content things 400.
Furthermore, the a little first sizing material P1 of above-mentioned this can be consistent with the second sizing material P2, also not limitting must be consistent, its both material for example can be respectively polypropylene (Polypropylene, PP), acrylonitrile-styrene-butadiene copolymer (ABS resin, Acrylonitrile Butadiene Styrene, ABC), polyethylene terephthalate (polyethylene Terephthalate, PET), polystyrene (polystyrene, PS), polycarbonate (polycarbonate, PC), pi (Polyimide) or polymethylmethacrylate (Poly (methyl methacrylate), PMMA) or its combination.
Light reflected content thing 400 can be the optical whitening agent particle, and the optical whitening agent particle can increase the whiteness of plastics significantly, makes the second plastic former P21 that is distributed with light reflected content thing 400 to be white in color.Further, the optical whitening agent particle for example be talan (Eastobrite, C28H18N2O2), mix the mixing of barium sulphate (BaSO4) or talan and barium sulphate, titania with silicon dioxide.
In addition, among other embodiment, light reflected content thing 400 also can be a metal powder, and for example silver, copper, gold, nickel, aluminium, tin, chromium, titanium, iron or its combination makes the second plastic former P21 that is distributed with light reflected content thing can be silver color or gold.
Certainly, among other embodiment, second feed chamber 613 also can only be placed light reflected content thing 400, with the shaping thing of independent output glue.
Please consult Fig. 1 simultaneously, Fig. 2 and Fig. 3 B, when carrying out above-mentioned steps (102): when the first plastic former P11 and the common pressing and forming of the second plastic former P21 are the light guide plate 100 of an integral body, the first plastic former P11 and the second plastic former P21 that is mixed with a plurality of smooth reflected content things 400 can be simultaneously by between this 2 first moulding rolling wheels 631 in same step, make that this 2 first moulding rolling wheel 631 is the light guide plate 100 of an integral body with the first plastic former P11 and the common pressing and forming of the second plastic former P21 on the one hand, guide the light guide plate 100 of this integral body to advance on the other hand towards the direction of the second moulding rolling wheel 632.
More specifically, by the position of these 2 first moulding rolling wheels 631 of move left and right, can adjust the light guide plate 100 of moulding is desired in crack between 631 of this 2 first moulding rolling wheels with control integral thickness.
When carrying out above-mentioned steps (103): when making a micro structured pattern 210 (shown in Fig. 3 B) to the surface of light guide plate 100, the light guide plate 100 of this integral body is during by the second moulding rolling wheel 632 and wherein between the one first moulding rolling wheel 631, because the space that the first moulding rolling wheel 631 and the second moulding rolling wheel are 632 is limited, space pattern on the second moulding rolling wheel 632 is convenient to the first plastic former P11 and is gone out a micro structured pattern 210 away from the coining of the second plastic former P21, and micro structured pattern 210 comprises a plurality of optical microstructures.
Yet, the mode of making micro structured pattern 210 is not limited only to this, other for example is divided into chemical etching (Etching), precision optical machinery portrayal method (V-cut), light lithography method (Stamper), internal divergence etc., perhaps, also can mode of printing the site be imprinted on the first plastic former P11 away from the second plastic former P21 simultaneously.In addition, micro structured pattern 210 comprises the structure of convex or concave.Further, the section shape of micro structured pattern 210 structures can be sphere, " V " font, " U " font, square, rectangle, rhombus, smart circle, triangle, waveform or its combination.Yet the structure of micro structured pattern 210 is not limited only to this.In addition, the distribution density of micro structured pattern 210 is along with increasing away from light source.The distribution density of micro structured pattern 210, distribution mode can need to decide with design, also can adopt regular distribution or stochastic distribution, are not limited at this.
Moreover it is the pulling force that drag guiding tabula rasa 100 in order to provide that wheel 633 is drawn in holder, so that quicken the speed that light guide plate 100 is transferred.
When carrying out above-mentioned steps (104), do not limit the mode of cooling, make light guide plate 100 have certain hardness, and keep shape outside the stereo microstructure pattern 210.
Please consult shown in Fig. 3 B, the light guide plate of finishing through above-mentioned method for making 100 roughly comprises the first plastic optics layer 200 (being the first above-mentioned plastic former P11), the second plastic optics layer 300 (being the second above-mentioned plastic former P21) again.The surface has a micro structured pattern 210 outside the first plastic optics layer 200.The second plastic optics layer 300 directly coincides on surface within the first plastic optics layer 200.Light reflected content thing 400 only is distributed in the second plastic optics layer, 300 inside, and more preferably, light reflected content thing 400 only is uniformly distributed in the second plastic optics layer, 300 inside.
What need emphasize is, because the second plastic optics layer 300 and the first plastic optics layer 200 are that institute's pressing forms under the hot melt state, therefore, compared to prior art, not deadlocked layer of tool and space between the second plastic optics layer 300 of light guide plate 100 of the present invention and the first plastic optics layer 200, so, can satisfy the purpose of light total reflection, and then improve the performance of reflection ray.
In addition, one of the present invention embodiment, the second plastic optics layer 300 directly coincides on the first plastic optics layer 200, and the first plastic optics layer 200 and the identical area of the second plastic optics layer, 300 tool.
Other embodiment of the present invention, the thickness of the first plastic optics layer 200 are greater than the thickness of the second plastic optics layer 300, and for example, the thickness of the first plastic optics layer 200 is more than 3～6 times of thickness of the second plastic optics layer 300.
Other embodiment of the present invention, the luminous reflectivity of the second plastic optics layer 300 that is distributed with light reflected content thing 400 is greater than the luminous reflectivity of the first plastic optics layer 200.Other embodiment of the present invention, the second plastic optics layer 300 that is distributed with light reflected content thing 400 be white in color or, silver color or gold.
Other embodiment of the present invention, the cumulative volume of these a little light reflected content things 400 account for the second plastic optics layer 300 volume 20%～50%.
See also shown in Fig. 3 C, be light guide plate 101 partial schematic diagrams among another embodiment, roughly identical with Fig. 3 B light guide plate 100, something in common is repeated description no longer, the difference part is can be behind difference the moulding above-mentioned first plastic optics layer 200 and the second plastic optics layer 300, by adhesion layer 700, make the plastic optics layer 200 of winning the light guide plate 101 on the second plastic optics layer 300 that coincides to finish an integral body.
See also shown in Figure 4.Fig. 4 illustrates the cross-sectional schematic of Quartering shot type backlight module 500.
Can be applicable in the Quartering shot type backlight module 500 through the light guide plate 100 that above-mentioned method for making is finished.This Quartering shot type backlight module 500 comprises described light guide plate 100, a backboard 510, a light source 520, a prismatic lens 540 and a diffusion sheet 530.Light guide plate 100 is positioned on the backboard 510.Light source 520 is positioned at the side (being incidence surface 211) of light guide plate 100.Prismatic lens 540 is positioned at one of light guide plate 100 (shown in 3B figure) end face (being exiting surface 212).Diffusion sheet 530 is between light guide plate 100 and prismatic lens 540.
So, when light L1, the L2 of light source 520 when incidence surface 211 enters light guide plate 100, the light L1 of light source 520 somes is through the guiding of the first plastic optics layer 200, and directly be sent light guide plate 100 towards the direction of exiting surface 212, and be subjected to the light diffusion of micro structured pattern 210, to form the briliancy uniform surface light source, provide required brightness; The light L2 of light source 520 other parts can be sent light guide plate 100 by the direction towards exiting surface 212 after the changed course, and be subjected to the light diffusion of micro structured pattern 210 after the reflection of the second plastic optics layer 300.
Yet above-mentioned light guide plate 101 also is applicable in this Quartering shot type backlight module 500, but is not given unnecessary details at this.
Because the present invention integrates the second plastic optics layer and the first plastic optics layer, and the second plastic optics layer has light reflected content thing, make no longer have the space between the second plastic optics layer and the first plastic optics layer, just can satisfy the purpose of light total reflection.So, backlight module of the present invention just no longer needs additionally to prepare the reflection subassembly of tool reflection function, so that simplification structure of back lighting module, save redundant space, also can reach the purpose that reduces cost, simultaneously, because backlight module of the present invention no longer needs additionally to prepare the stand-alone assembly of tool reflection function, also can avoid producing light non-uniform phenomenon (mura), and then promote lighting quality.
The present invention discloses among as above each embodiment; be not in order to limiting the present invention, anyly have the knack of this skill, without departing from the spirit and scope of the invention; when can doing various changes and retouching, so the present invention's protection domain is when looking being as the criterion that accompanying Claim defines.
Claims (17)
1. a light guide plate is characterized in that comprising: one first plastic optics layer; The described first plastic optics layer tool light transmission with have relative first and second, this first mask has a micro structured pattern; One second plastic optics layer; Described second plastic optics is stacking closes in this second; And a plurality of smooth reflected content things; Described a plurality of smooth reflected content thing is distributed in this second plastic optics layer.
2. light guide plate according to claim 1 is characterized in that: this second plastic optics layer jointlessly coincides in this first plastic optics layer this second.
3. light guide plate according to claim 1 is characterized in that: this second plastic optics layer is by on deadlocked stacking this second of closing in this first plastic optics layer.
4. light guide plate according to claim 1 is characterized in that: the thickness of this first plastic optics layer is more than 3～6 times of thickness of this second plastic optics layer.
5. light guide plate according to claim 1 is characterized in that: the cumulative volume of those light reflected content things account for this second plastic optics layer volume 20%～50%.
6. light guide plate according to claim 1 is characterized in that: the material of this first plastic optics layer or this second plastic optics layer is to be selected from the group that is made up of polypropylene, acrylonitrile-styrene-butadiene copolymer, polyethylene terephthalate, polystyrene, polycarbonate, pi or polymethylmethacrylate or its combination.
7. light guide plate according to claim 1 is characterized in that: this light reflected content thing is a metal powder.
8. light guide plate according to claim 1 is characterized in that: this light reflected content thing is the optical whitening agent particle.
9. light guide plate according to claim 8 is characterized in that: the material of this optical whitening agent particle is to be selected from the combination of talan, talan and barium sulphate or the combination of titania and silicon dioxide.
10. a Quartering shot type backlight module comprises: a backboard; It is characterized in that also comprising: just like each light guide plate among the claim 1-9; Described light guide plate is positioned on this backboard; One light source; Described light source is positioned at one of this light guide plate incidence surface; One prismatic lens; Described prismatic lens is positioned at one of this light guide plate exiting surface; An and diffusion sheet; Described diffusion sheet is between this light guide plate and this prismatic lens.
11. a method for manufacturing light guide plate is realized by following steps:
Ejection formation one first plastic former and one second plastic former wherein have a plurality of smooth reflected content things in this second plastic former simultaneously; And
With this first plastic former and the common pressing and forming of this second plastic former is holistic light guide plate.
12. method for manufacturing light guide plate according to claim 11, wherein:, be the light guide plate of this integral body with this first plastic former and the common pressing and forming of this second plastic former by moulding roll extrusion wheels.
13. method for manufacturing light guide plate according to claim 11, wherein:, this first plastic former is gone out a micro structured pattern away from a coining of this second plastic former by another moulding roll extrusion wheels.
14. method for manufacturing light guide plate according to claim 11, wherein: the material of this first plastic former or second plastic former is to be selected from the group that is formed by by polypropylene, acrylonitrile-styrene-butadiene copolymer, polyethylene terephthalate, polystyrene, polycarbonate, pi or polymethylmethacrylate or its combination.
15. method for manufacturing light guide plate according to claim 11, wherein: the material of this light reflected content thing is selected from the group that silver, copper, gold, nickel, aluminium, tin, chromium, titanium, iron and combination thereof are formed.
16. method for manufacturing light guide plate according to claim 11, wherein: this light reflected content thing is to be selected from the combination of talan, talan and barium sulphate or the combination of titania and silicon dioxide.
17. method for manufacturing light guide plate according to claim 11, wherein: the cumulative volume of those light reflected content things account for this second plastic former volume 20%～50%.
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| CN2011101052194A CN102129098A (en) | 2011-04-26 | 2011-04-26 | Light guiding plate, manufacturing method of light guiding plate and side emitting type backlight module |
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| CN109814196A (en) * | 2017-11-22 | 2019-05-28 | 致伸科技股份有限公司 | The electronic device of light-guide device and the application light-guide device |
| CN109111701A (en) * | 2018-07-20 | 2019-01-01 | 台州市优天然生物材料股份有限公司 | A kind of composition preparing light guide plate |
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Application publication date: 20110720 |