CN101819294A - Optical element, manufacturing method thereof and backlight module - Google Patents
Optical element, manufacturing method thereof and backlight module Download PDFInfo
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- CN101819294A CN101819294A CN200910118661A CN200910118661A CN101819294A CN 101819294 A CN101819294 A CN 101819294A CN 200910118661 A CN200910118661 A CN 200910118661A CN 200910118661 A CN200910118661 A CN 200910118661A CN 101819294 A CN101819294 A CN 101819294A
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Abstract
The invention provides an optical element, a manufacturing method thereof and a backlight module. The backlight module comprises the optical element. The optical element comprises a plurality of microstructures and a plurality of reflecting structures, wherein the microstructures extend along a first direction and are arranged on a light emergent surface along a second direction; the distance between a first curve and a second curve is unequal and not parallel in the second direction; the distance between the second curve and another first curve is unequal and not parallel in the second direction; the reflecting structures extend along the first direction and are arranged on a light incident surface along the second direction, and the position of each reflecting structure corresponds to the joint of two microstructures; a thickness exists from each reflecting structure to the light incident surface; and the length of the microstructures along the second direction is a width P, which meets the following formula with a refractive index n of the optical element. When the design of the optical element meets the formula, the optical effect is better.
Description
Technical field
The present invention relates to a kind of optical element and its manufacture method and a backlight module, relate in particular to a kind of optical element and its manufacture method and backlight module about having microstructure and reflection configuration.
Background technology
Fig. 1 illustrate is the part cut-open view of the brightness enhancement film among the US7309149.With reference to Fig. 1, comprise a reflection configuration 13 ' on the incidence surface 12 ' of brightness enhancement film 1 ', after the first light L1, the second light L2 and the 3rd light L3 are incident in the incidence surface 12 ' of brightness enhancement film 1 ', the first light L1 is towards the front refraction of brightness enhancement film 1 ', the second light L2 is from reflecting structure 13 ' reflection, the 3rd light L3 then be reflected structure 13 ' or prism unit 11 ' reflection.Second light L2 that is reflected and the 3rd light L3 can be once again by the reflections of the reflecting plate (not shown) of brightness enhancement film 200 belows, so that utilize the second light L2 and the 3rd light L3 again.
Because the setting of reflection configuration 13 ' can make the light that is incident to incidence surface be difficult for reflecting towards the side of brightness enhancement film, therefore when the user was watched by the front of brightness enhancement film 1 ', it can experience higher brightness.
In US7309149, the width of its standard reflection configuration 13 ' be less than or equal to 11 of prism unit spacing 2/3rds.Yet it does not make standard to the interval of reflection configuration 13 ' with thickness, so those of ordinary skills can't make the design of further optimization according to US7309149.And, described prism unit 11,11 ' all is arranged in brightness enhancement film 1 in mode parallel to each other, on 1 ', because the pixel electrode on the liquid crystal panel also is to arrange in mode parallel to each other, therefore visually be easy to produce so-called folded line figure (moire pattern).
Therefore, how solving the above problems, is to be worth those of ordinary skills to go to consider ground.
Summary of the invention
The purpose of this invention is to provide a kind of optical element, this optical element can effectively be eliminated the problem of folded line figure, also standard is made with thickness in the interval of reflection configuration simultaneously, so that those of ordinary skills can make the design of optimization.
According to above-mentioned purpose and other purposes, the invention provides a kind of optical element, it has an exiting surface and an incidence surface, and the light that at least one light source sent that is positioned over the incidence surface side can produce at least one optical path in that optical element is inner.Optical element comprises a plurality of microstructures and a plurality of reflection configuration, and wherein microstructure is arranged on the exiting surface along first direction extension and along a second direction.Each microstructure has a top margin, and this top margin is positioned on the exiting surface and forms many first curves and many second curves adjacent one another are.First curve and second curve extend toward first direction, described first curve and described second curve distance between on the described second direction is unequal and not parallel, and between on the described second direction of described second curve and another first curve apart from unequal and not parallel.
In addition, each reflection configuration is arranged on the incidence surface along the first direction extension and according to second direction, and the position of each reflection configuration is corresponding mutually with the junction of two microstructures.Described each reflection configuration has a thickness t to described incidence surface, and described microstructure is a width P along the length of second direction, with the refractive index n of optical element, satisfies following formula:
Wherein, optical path is the incidence surface incident by optical element, and the thickness by reflection configuration is with the control optical path, and the described microstructure on the exiting surface is in order to optical path is restrained.
In above-mentioned optical element, the profile of the longitudinal profile of microstructure is a camber line, and the radius-of-curvature of described camber line is R, and first curve and the distance of described second curve on described second direction are D, and R and D satisfy following formula: 0.5R＜D＜3R.
In above-mentioned optical element, the width P of the focal length FD of microstructure and the bottom of microstructure, satisfy following formula:
According to above-mentioned purpose and other purposes, the invention provides a kind of manufacture method of optical element, be used to make above-mentioned optical element, the manufacture method of this optical element comprises following step.At first, provide a transparent base, and be coated with a moulding glue in a wherein side of described transparent base.Come, a mould is provided, have a plurality of moulding patterns on the surface of described mould, the external form of these moulding patterns is corresponding with the microstructure on the optical element.Afterwards, mould impresses on moulding glue, and the moulding glue behind the impression is hardened, to form microstructure.Come again, be coated with a photoresist layer in the other side of transparent base.Then, photoresist layer is carried out the exposure imaging processing procedure, forming a structural region, and the photoresist layer of non-structural region removed.Afterwards, the last layer of reflective material of coating.Come again, the photoresist layer and the position layer of reflective material thereon of structural region are removed, and formed reflection configuration.
According to above-mentioned purpose and other purposes, the invention provides a kind of backlight module, this backlight module comprises an optical sheet, at least one light source and above-mentioned optical element, optical element is positioned over the exiting surface side of optical sheet.
In above-mentioned backlight module, optical sheet is a diffuser plate or a light guide plate.
In above-mentioned backlight module, light source is cathode fluorescent tube or light emitting diode.
Compared with prior art, optical element of the present invention can effectively be eliminated the problem of folding the line figure, also standard is made with thickness in the interval of reflection configuration simultaneously, so that those of ordinary skills can make the design of optimization.
For above-mentioned purpose of the present invention, feature and advantage more can be become apparent, hereinafter will and cooperate appended diagram with embodiment, be described in detail below.
Description of drawings
Fig. 1 illustrate is the part cut-open view of the brightness enhancement film among the US7309149;
Fig. 2 illustrate is the optical element of the first embodiment of the present invention;
Fig. 3 illustrate is the projection of top margin on the xy plane;
Fig. 4 A～Fig. 4 E illustrate is the manufacture method of optical element;
Fig. 5 illustrate is the backlight module of the first embodiment of the present invention.
Description of reference numerals: 1,1 '-brightness enhancement film; 11,11 '-prism unit; 13 '-reflection configuration; L1-first light; L2-second light; L3-the 3rd light; The 2-optical element; The 21-exiting surface; The 22-microstructure; 22 '-moulding glue; The 221-top margin; The 222-trough; 2211-first curve; 2212-second curve; The 23-reflection configuration; 23 '-layer of reflective material; The 24-incidence surface; The 25-transparent base; The 261-structural region; The 4-roller; The 41-surface; The 5-backlight module; The 51-diffuser plate; The 52-light source; The 53-reflex housing; The R-radius-of-curvature; T-thickness; The P-width; The n-refractive index; D1, D2-distance; L4, L5-light.
Embodiment
In following embodiment, will represent second direction with the x direction of principal axis, the y direction of principal axis is represented first direction, understands this just convenience in order to represent but those of ordinary skills are described, but not the qualification that first direction and second direction are done.
Please refer to Fig. 2, Fig. 2 illustrate is the stereographic map of the optical element of the first embodiment of the present invention.It is one lamellar that optical element 2 is substantially, and it for example is the top that is configured in the diffuser plate in the direct type backlight module, just the exiting surface side of diffuser plate.Wherein, the exiting surface 21 of optical element 2 has a plurality of microstructures 22, and these microstructures 22 are to be arranged on the exiting surface 21 along directions X, and each microstructure 22 has a top margin 221.Wherein, the function of these microstructures 22 is for the optical path of light is restrained.
In addition, also be provided with a plurality of reflection configurations 23 on the incidence surface 24 of optical element 2, these reflection configurations 23 are to be arranged on the incidence surface 24 along directions X, and the material of reflection configuration 23 is titania or magnesium oxide.And the formed trough of 22 of the position of each reflection configuration 23 and two microstructures 222 is corresponding mutually.Wherein, described each reflection configuration has a thickness t to described incidence surface, and described microstructure is a width P along the length of x direction of principal axis, and the refractive index of optical element 2 is n, and satisfies following formula:
As shown in Figure 2, part light L4 is by incidence surface 24 incidents, and the light L5 of part structure 23 reflection that then is reflected can be controlled the optical path of light by the thickness t of reflection configuration 23.And the microstructure 22 on exiting surface 21 can restrain the optical path of light L4.
Please refer to Fig. 2 and Fig. 3, Fig. 3 illustrate is formed many curves of the projection of top margin on the xy plane.As shown in Figure 2, microstructure 22 is to extend toward the y direction basically, and the extension path of microstructure 22 is curved.When being projected on the xy plane up to I haven't seen you for ages, the top margin 221 of microstructure 22 forms multiple different curve, to be called first curve 2211 from the curve that left side number is positioned at odd positions at this, and will be called second curve 2212 from the curve that left side number is positioned at the even number position.Be noted that, curve is divided into the just convenience of explanation of first curve 2211 and second curve 2212, do not represent the first all curves 2211 all to have identical curve shape, also do not represent the second all curves 2212 all to have identical curve shape.
Please refer to Fig. 3,2212 of first curve 2211 and second curve, 2212, the first curves 2211 and second curves are also not parallel.Wherein, each second curve 2212 is wherein between 2 first curves 2211, and the distance that is positioned at 2212 of first curve 2211 of a side wherein and second curves is D1, and the distance that is positioned at 2212 of first curve 2211 of an other side and second curves is D2.Wherein, distance D 1 can change along the y direction with distance D 2, and distance D 1 and distance D 2 and inequality.
The profile of the longitudinal profile of microstructure 22 is a camber line, and the radius-of-curvature of this camber line is R.No matter be distance D 1 and distance D 2, be referred to as distance D at this, can state following formula as with the relation of radius of curvature R:
0.5R＜D＜3R............................ formula (2).
In addition, the focal length of microstructure is FD (not being illustrated among the figure), and satisfies following formula:
Because the pixel electrode on the liquid crystal panel also is to arrange in mode parallel to each other, and the extension path of the microstructure 22 of present embodiment is curved, so it visually is difficult for producing folded line figure.
In addition, the applicant of this case carries out computer simulation with above-mentioned optical element 2, and in this simulation, the width P of the bottom of microstructure 22 is made as 185 μ m, and the refractive index n of optical element 2 is 1.63, is t by the thickness that changes reflection configuration 23, can obtain following table:
| |
1 | 2 | 3 | 4 | 5 |
| Thickness t (μ m) | 43 | 33 | 20 | 13 | 4 |
| Intensity | 0.68 | 0.83 | 1.0 | 1.0 | 1.0 |
| 1/2 visual angle (.) | ??12.4 | ??14.1 | ??16.5 | ??17.8 | ??19.4 |
Wherein, the light intensity that when the front of optical element 2 is watched, presented of " intensity " of last table representative, 1/2 o'clock viewing angle of the light intensity that on behalf of light intensity, " 1/2 visual angle " then be kept to watch in the front.And emulation mode 1～2 does not satisfy formula (1), and 3～5 of emulation modes satisfy formula (1).
Therefore, in sum, those of ordinary skills can control the optical path of light by the thickness of reflection configuration 23, and when formula (1) was satisfied in the design of optical element 2, it had preferable optical effect.
Below, will the manufacture method of above-mentioned optical element 2 be introduced, please refer to Fig. 4 A～Fig. 4 E.At first, please refer to Fig. 4 A, a moulding glue 22 ' in the wherein side coating of a transparent base 25, the material of this transparent base 25 for example is polycarbonate (polycarbonate), Polyethylene Naphthalate (polyethylenenaphthalate, PEN) or polyethylene terephthalate (polyethylene terephthalate, and moulding glue 22 ' for example is UV cured glue or thermmohardening glue PET).
Come, a roller 4 is provided, have a plurality of moulding patterns (not illustrating) on the surface 41 of described roller 4, the external form of these moulding patterns is corresponding with the microstructure 22 of optical element 2 (as shown in Figure 2).Just, microstructure 22 is shape protruding upward, and the moulding pattern then is the shape to lower recess, mends each other.
Afterwards, please refer to Fig. 4 B, after roller 4 hardens at moulding glue 22 ' last impression and to moulding glue, just can on transparent base 25, form microstructure 22.The sclerosis mode of moulding glue 22 ' is difference along with the difference of the kind of moulding glue 22 ', for example if moulding glue 22 ' is UV cured glue, then use ultraviolet ray to shine so that its moulding if moulding glue 22 ' is thermmohardening glue, then uses the mode of heating to make its moulding.In addition, in the present embodiment, use 4 pairs of moulding glue 22 ' of roller to impress, but those of ordinary skills can replace to roller 4 mould of other kenels.
Come again, please refer to Fig. 4 C, after the making of finishing microstructure 22, be coated with a photoresist layer at transparent base 25 opposite sides.Then, behind the coating photoresist layer, carry out the exposure imaging processing procedure,, utilize chemical agent that the photoresist layer beyond the structural region 261 is removed, only stay the part of structural region 261 to form a structural region 261.
Come again, please refer to Fig. 4 D, be coated with a last layer of reflective material 23 ', described layer of reflective material 23 ' covered structure zone 261, and the photoresist layer of structural region 261 can produce bond with layer of reflective material 23 '.Afterwards, please refer to Fig. 4 E, the photoresist layer and the position layer of reflective material 23 ' thereon of structural region 261 are removed, just can form reflection configuration 23.After finishing the making of reflection configuration 23, also just finished optical element 2 of the present invention.
See also Fig. 5, Fig. 5 illustrate is for using the direct type backlight module of optical element of the present invention.This backlight module 5 comprises a diffuser plate 51, a plurality of light source 52, a reflex housing 53 and optical element 2 shown in Figure 4, and wherein light source 52 is a cathode fluorescent tube in the present embodiment, but also can change it into light emitting diode.Light source 52 is to be configured in the reflex housing 53, and reflex housing 53 can reflex to the light that light source 52 is sent in the diffuser plate 51.The effect of diffuser plate 51 is that the light that light source 52 is sent is spread, and the main composition material of diffuser plate 51 for example is transparency materials such as polymethylmethacrylate (poly methyl methacrylate), polycarbonate or polyethylene terephthalate.And, then be scattered with a plurality of smooth diffusion particles (not illustrating) in diffuser plate 51, the main composition material of the refractive index of described smooth diffusion particle and diffuser plate 51 is also inequality, therefore when light passes through the light diffusion particle, its optical path can produce deviation, thereby reaches the effect that makes the light diffusion.
In Fig. 5, backlight module 5 is a bottom-lighting type back light module, but optical element of the present invention 2 also can be used on the backlight module of other kenels, for example: side light type back light module.In side light type back light module, optical element 2 is to be configured on the light guide plate.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those of ordinary skills understand, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (10)
1. an optical element is characterized in that, it has an exiting surface and an incidence surface, and the light that at least one light source sent that is positioned over described incidence surface side can produce at least one optical path in that described optical element is inner, and described optical element comprises:
A plurality of microstructures, be arranged on the described exiting surface along first direction extension and along a second direction, each described microstructure has a top margin, and described top margin is positioned on the described exiting surface and form many first curves and many second curves adjacent one another are, described first curve and described second curve extend toward described first direction, described first curve and described second curve distance between on the described second direction is unequal and not parallel, and between on the described second direction of described second curve and another first curve apart from unequal and not parallel;
A plurality of reflection configurations, each reflection configuration is arranged on the described incidence surface along described first direction extension and along described second direction, and the position of each reflection configuration is corresponding mutually with the junction of two microstructures, described each reflection configuration to described incidence surface has a thickness t, and described microstructure is a width P along the length of second direction, with the refractive index n of described optical element, satisfy following formula:
Wherein, described optical path is by described incidence surface incident, and the thickness by described a plurality of reflection configurations is controlling described optical path, and the described a plurality of microstructures on described exiting surface are used for described optical path is restrained.
2. optical element as claimed in claim 1, it is characterized in that the profile of the longitudinal profile of described microstructure is a camber line, the radius of curvature R of described camber line, and described first curve and the distance D of described second curve on described second direction, satisfy following formula: 0.5R＜D＜3R.
3. optical element as claimed in claim 1 is characterized in that, the width P of the focal length FD of described microstructure and the bottom of described microstructure satisfies following formula:
4. the manufacture method of an optical element is used to make optical element as claimed in claim 1, it is characterized in that, the manufacture method of described optical element comprises:
One transparent base is provided, and is coated with a moulding glue in a wherein side of described transparent base;
One mould is provided, has a plurality of moulding patterns on the surface of described mould, the external form of described a plurality of moulding patterns is corresponding with the microstructure on the described optical element;
Described mould is impressed on described moulding glue, and the moulding glue behind the impression is hardened, to form described microstructure;
Other side at described transparent base is coated with a photoresist layer;
Described photoresist layer is carried out the exposure imaging processing procedure, forming a structural region, and the described photoresist layer of non-structural region removed;
Be coated with a last layer of reflective material, described layer of reflective material covers described structural region; And
The photoresist layer of described structural region is removed with the described layer of reflective material that is positioned on the described structural region, to form described reflection configuration.
5. the manufacture method of optical element as claimed in claim 4 is characterized in that, the material of described layer of reflective material is titania or magnesium oxide.
6. the manufacture method of optical element as claimed in claim 4 is characterized in that, described moulding glue is UV cured glue or thermmohardening glue.
7. the manufacture method of optical element as claimed in claim 4 is characterized in that, the material of described transparent base is polycarbonate, PEN or polyethylene terephthalate.
8. a backlight module is characterized in that, it comprises that described backlight module comprises as the described optical element of arbitrary claim in the claim 1 to 3:
One optical sheet;
At least one light source is placed on the light inlet side of described optical sheet; And
Described optical element is positioned over the exiting surface side of described optical sheet.
9. backlight module as claimed in claim 8 is characterized in that, described optical sheet is a diffuser plate or a light guide plate.
10. backlight module as claimed in claim 8 is characterized in that, described light source is cathode fluorescent tube or light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101186613A CN101819294B (en) | 2009-02-27 | 2009-02-27 | Optical element, manufacturing method thereof and backlight module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101186613A CN101819294B (en) | 2009-02-27 | 2009-02-27 | Optical element, manufacturing method thereof and backlight module |
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| Publication Number | Publication Date |
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| CN101819294A true CN101819294A (en) | 2010-09-01 |
| CN101819294B CN101819294B (en) | 2012-05-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103171230A (en) * | 2011-12-21 | 2013-06-26 | 鼎力光学有限公司 | Manufacturing method of functional screen protector |
| CN104570473A (en) * | 2014-12-24 | 2015-04-29 | 宁波东旭成新材料科技有限公司 | Brightness enhancement film |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060023452A (en) * | 2004-09-09 | 2006-03-14 | 삼성전자주식회사 | Prism sheet, backlight assembly and liquid crystal display apparatus having the same |
| CN100485429C (en) * | 2007-04-25 | 2009-05-06 | 长兴光学材料（苏州）有限公司 | Thin type flexible light-guiding component |
-
2009
- 2009-02-27 CN CN2009101186613A patent/CN101819294B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103171230A (en) * | 2011-12-21 | 2013-06-26 | 鼎力光学有限公司 | Manufacturing method of functional screen protector |
| CN104570473A (en) * | 2014-12-24 | 2015-04-29 | 宁波东旭成新材料科技有限公司 | Brightness enhancement film |
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| CN101819294B (en) | 2012-05-23 |
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