CN101315433B - Optical adjusting member and illumination device and liquid crystal display device including the same - Google Patents

Optical adjusting member and illumination device and liquid crystal display device including the same Download PDF

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Publication number
CN101315433B
CN101315433B CN200810109804XA CN200810109804A CN101315433B CN 101315433 B CN101315433 B CN 101315433B CN 200810109804X A CN200810109804X A CN 200810109804XA CN 200810109804 A CN200810109804 A CN 200810109804A CN 101315433 B CN101315433 B CN 101315433B
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cross
section
limit
light
adjusting member
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CN101315433A (en
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岛崎胜辅
小川容一
佐藤畅高
小山荣二
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Maxell Ltd
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Hitachi Maxell Ltd
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Priority claimed from JP2007305718A external-priority patent/JP2009128764A/en
Priority claimed from JP2007311509A external-priority patent/JP4945414B2/en
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  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

An optical adjusting member according to the invention includes a base member having optical transparency and a plurality of linear members provided on the base member and having optical transparency. A section of the linear member orthogonal to the lengthwise direction of the linear member includes a triangular first sectional part defined by first to third sides and an approximately triangular second sectional part. The second sectional part has a smaller area than that of the first sectional part and defined by fourth to sixth sides. The first side of the first sectional part is in contact with the surface of the base member. The second sectional part is formed on the second side of the first sectional part, and the fourth side of the second sectional part is in contact with the second side of the first sectional part.

Description

Optical adjusting member and the lighting device and the liquid crystal indicator that possess it
Technical field
The present invention relates to control optical adjusting member and the lighting device and the liquid crystal indicator that possesses it of the direct of travel of incident ray.
Background technology
Originally, in the various lighting devices such as back light unit of LCD etc., possessed adjustment from the range of the light of light source and the mechanism of brightness.In most lighting devices, in its light path or the exit portal of light source base be provided with the optical adjusting members such as thin plate of the directive property that is used to control light.This optical adjusting member has light transmission, has to make incident light gather the function to prescribed direction, perhaps, makes the function of incident light diffusion.
Make incident light gather function as having, promptly control the representative example of optical adjusting member of the function of light directive property, prismatic lens is arranged (for example, with reference to patent documentation 1: the flat 10-506500 communique of special table) to prescribed direction.Prismatic lens generally be several prescribed direction extend and with the cross section of this bearing of trend quadrature be the optical structure (below be also referred to as the prism-like tectosome) of triangle or the optical structure that the cross section is semicircle (semiellipse) shape (below be also referred to as the phacoidal structure body) side by side structure continuously on lamellar base material.Then, be utilized in the prismatic effect of these optical structures that form on the base material or the direct of travel of lens effect control light.
In addition, in the back light unit of liquid crystal indicator, for example be the prismatic lens that a plurality of above-mentioned prism-like tectosomes is set with 2 pieces on base material originally, be configured to the bearing of trend mutually orthogonal (for example, with reference to patent documentation 1) of the prism-like tectosome of each prismatic lens.The general formation of shown in Figure 14 the is back light unit that this liquid crystal indicator uses.In addition, shown in Figure 15 is the general structure of prismatic lens.Back light unit 501 main a plurality of functional optical sheet groups 506～508 formations that become the LGP 504 of area source, the reflecting plate 505 that disposes in the bottom of LGP 504 (back to a side of display panels 52), configuration by light source 503, light 510 shown in figure 14 that liquid crystal indicator is used on the top of LGP 504 (display panels 52 sides) from light source 503 outgoing.Functional optical sheet group mainly is made up of bottom diffusion sheet 506, prismatic lens group 507 and top diffusion sheet 508 etc.
Back light unit shown in Figure 14 is the lighting device that disposes so-called edge light (sidelight) mode of light source 503 at the sidepiece of LGP 504; Incide the sidepiece of LGP 504 from the light 510 of light source 503 radiation, the light of incident is from the surperficial 504a outgoing of LGP 504.At this moment, assemble to a certain extent from the directive property of the emergent light 511 of LGP 504, its direction is with respect to the normal direction of the exit facet 504a of LGP 504 angle tilt with regulation.And, be maximum in the brightness of this vergence direction emergent light 511.Below, in this manual, call ' brightness peak light ' to the light composition of advancing for maximum direction in the brightness of this light.Also have, in Figure 14, separate each optics and put down in writing for the formation of easy to understand liquid crystal indicator 500, in fact each optics connects together overlapping.
Prismatic lens group 507 comprises 2 pieces of prismatic lens 507a and 507b, each prismatic lens is shown in figure 15 have on flat substrates 507c prescribed direction extend and with the cross section of this bearing of trend quadrature be prism-like tectosome 507d several the structure side by side abreast of triangle.And the bearing of trend of prism-like tectosome 507d that is configured to each prismatic lens 507a, 507b in back light unit 501 is mutually orthogonal.
As stated; In the backlight unit (back light unit) that existing liquid crystal indicator is used; In order to assemble from the light of LGP outgoing to shine on the LCD panel effectively, and adopted the optical configuration prismatic lens (optical adjusting member) with a plurality of prism-like (triangle column) shown in figure 15.Although this existing prismatic lens has good optically focused performance, with regard to one piece of prismatic lens, have from the problem of color separated of the light of prismatic lens outgoing and so on.Its result; If come the words of illuminated objects with the lighting device that has used this prismatic lens; The edge part color that then has the shadow of object is oozed out; Perhaps used the occasion of this prismatic lens at the back light unit of liquid crystal indicator, the being seen occasion of certain angle with being seen occasion color seems different problems from the front.In addition, also insufficient with 1 piece of prismatic lens brightness.
With Figure 17 the problem that above-mentioned look separates is described more specifically.Figure 17 is the amplification view of the prism-like tectosome 507d of prismatic lens 507a shown in Figure 15, the figure of the state of the refraction of the light that the prism-like tectosome 507d when to be expression light 512 with the incident angle of regulation incide prismatic lens 507a produces.Also have, in Figure 17, for the problem that the above-mentioned look of easy to understand separates, expression be the direct situation of the existing prismatic lens of configuration on the exit facet of LGP, the state of the refraction of the light in the edge-light type back light unit of structure promptly shown in Figure 16.Also have, the light composition of advancing for maximum direction in the brightness of this light among the light of prismatic lens 507a, i.e. brightness peak light are incided in light 512 expressions among Figure 17.
The brightness peak light 512 that incides prism-like tectosome 507d is shown in figure 17, is reflected at the face 507e of light direct of travel side by prism-like tectosome 507d, to the thickness direction outgoing of prismatic lens 507a.At this moment, because the refractive index of the formation material of prism-like tectosome 507d (prismatic lens 507a) is different with light wavelength, according to the wavelength components that is included in the brightness peak light 512, the amount of refraction among the face 507e of prism-like tectosome 507d is different.Its result, shown in figure 17, the refractive direction of the refract light among the face 507e of prism-like tectosome 507d is with wavelength shift, and the pattern generating look with regulation in from the emergent light 513 of prismatic lens 507a separates.Also have, in Figure 17, for the purpose of simplifying the description, only represent the separation of 2 wavelength components.
In addition, when only using 1 piece of prismatic lens, except that the problem that above-mentioned look separates, also has the also not enough problem of brightness.Especially in the edge light mode back light unit, above-mentioned look separates employed back light unit such as existing liquid crystal indicator and the problem of luminance shortage in order to solve, and common that kind shown in figure 14 is piled up use to 2 pieces of prismatic lenses.
Yet; As stated; In the lighting device and liquid crystal indicator of structure shown in Figure 14, in order to address the above problem, needing a plurality of optical sheet set (is 2 pieces of prismatic lenses in the example of Figure 14; 2 pieces of diffusion sheets), the slimming and the cost degradation of lighting device and liquid crystal indicator are restricted.
Summary of the invention
The present invention is the scheme that proposes in order to address the above problem, and the purpose of this invention is to provide with an optical adjusting member just can solve the problem of above-mentioned look separation and luminance shortage and can realize the slimming of lighting device and liquid crystal indicator and the optical adjusting member of cost degradation.
According to first mode of the present invention; A kind of optical adjusting member is provided; It is characterized in that; Possess: a plurality of thread like bodies that have the base material of light transmission and on said base material, be provided with light transmission; Have second cross-section of first cross-section of dividing the triangle that forms by first～the 3rd limit and area and general triangular shape that by four～the hexagon division formed littler than first cross-section with the cross section of the bearing of trend quadrature of said thread like body, first limit of first cross-section contacts with the surface of said base material abreast, and second cross-section is located on second limit of first cross-section; And the 4th limit of second cross-section contacts with second limit of first cross-section abreast.
Present inventors inquire into the optical adjusting member of the direct of travel of control incident direction repeatedly, find through using the optical adjusting member of above-mentioned structure, can suppress the look separation from the emergent light of optical adjusting member.This be because; Take above-mentioned structure through making above-mentioned optical adjusting member; Is the pattern reciprocal with respect to the direct of travel of the light that incides optical adjusting member in the look separation of the light of the face refraction of the thread like body on the 5th limit that comprises second cross-section with look separation at the light of the face refraction of the thread like body of the hexagon that comprises second cross-section, and the look between the light of the light of the face refraction of the thread like body on the 5th limit that comprises second cross-section and the face refraction of the thread like body of the hexagon that is comprising second cross-section separates and cancel out each other (suppressing the principle that look separates will be described in detail in the back).
Have again; Optical adjusting member of the present invention is through making above-mentioned structure; Since can from the LGP outgoing have to a certain degree that the direct of travel of the light of the convergence of directive property directly is altered to the thickness direction of optical adjusting member, thereby the bottom diffusion sheet needn't be set between prismatic lens group and LGP as original.That is, optical adjusting member of the present invention needn't use the bottom diffusion sheet having to a certain degree from the LGP outgoing that the converging light of directive property temporarily is transformed into wide cut light as original.Therefore, can improve, can improve light characteristic from the utilization ratio of the light of LGP outgoing.That is, optical adjusting member of the present invention just can solve the look separation of above-mentioned emergent light and the problem of luminance shortage with an optical adjusting member.
Especially; When lighting device that is applied to optical adjusting member of the present invention edge light mode etc.; Owing to the look separation that can suppress emergent light, thereby needn't as original, use 2 pieces of prismatic lenses for the look separation that suppresses emergent light through an optical adjusting member.In addition, as stated,, needn't as original, the bottom diffusion sheet be set between prismatic lens crowd and LGP in the occasion of using optical adjusting member of the present invention.Therefore, when lighting device that is applied to optical adjusting member of the present invention edge light mode etc., can reduce the number of optics, slimming and cost degradation that can implement device.
Optical adjusting member of the present invention better is that a plurality of second cross-section are set on second limit of first cross-section.
Optical adjusting member of the present invention better is that said a plurality of second cross-section all is of similar shape and size.Optical adjusting member of the present invention better is the shape similar figures each other of said a plurality of second cross-section.In addition, optical adjusting member of the present invention better is that the drift angle relative with the 4th limit of said a plurality of second cross-section is identical angle.
Optical adjusting member of the present invention better is shorter than another limit near the limit of the drift angle relative with first limit of first cross-section among the 5th and the hexagon of second cross-section.When adopting such formation; For example; Like Fig. 1 and shown in Figure 2; Can make the caustic surface 12f (comprising face) of the thread like body 13 of the thickness direction that makes among 2 faces that divide to form the drift angle (for example, the bight 12e among Fig. 1) relative brightness peak light 52 be refracted to optical adjusting member 1 wideer with the 4th limit 12b of the second cross-section 12a away from the limit 12c of the drift angle 11e of the first cross-section 11a.Therefore,, increase (owing to being increased) owing to incide the light of the caustic surface of thread like body, thereby can further improve the utilization ratio of incident light, further improve light characteristic by the light of optically focused in this occasion.
Optical adjusting member of the present invention better is; The 5th limit and the hexagon of second cross-section tilt with respect to the 4th limit; Make when the brightness peak light of in the light characteristic of the light that incides said optical adjusting member, advancing on the direction of brightness for maximum is reflected by said optical adjusting member that the direct of travel of the brightness peak light that the direct of travel of this brightness peak light after the face refraction of the said thread like body of the direct of travel of the brightness peak light after the face refraction of the said thread like body on the 5th limit of involved second cross-section and the hexagon of involved second cross-section is preceding with respect to refraction is reciprocal.
Optical adjusting member of the present invention better is that the 3rd limit of first cross-section is with respect to the vergence direction on first limit and the maximum direction almost parallel of brightness in the light characteristic of the light that incides said optical adjusting member.The 3rd limit and the angle between first limit that are more preferably first cross-section are (for example; β 1 among Fig. 2) with the brightness peak light that incides optical adjusting member (for example; Light 52 among Fig. 2) with respect to the angle of substrate surface (for example, the degree of 90 among Fig. 2-θ) identical or bigger.If adopt such structure,, thereby can further improve the utilization ratio of incident light then because the reflection of incident light and the refraction that comprise in the face (for example, the face 13c among Fig. 1) of thread like body on the 3rd limit of first cross-section are very little.
Optical adjusting member of the present invention better is that said a plurality of thread like body periodically disposes in the direction with its bearing of trend quadrature.
Optical adjusting member of the present invention better is, is n in the refractive index of said thread like body 1, surround the refractive index n of the air of said base material and said thread like body 0Be 1.0, the direction angulation of the normal direction at the interface of said air and said base material and said airborne said light is I 1, the direction angulation of the said light of the inside of said normal direction and said thread like body is I 2, first limit and second limit, the 4th limit and the 5th limit, and the 4th limit and hexagon angulation are respectively α 1, α 2And β 2The time, satisfy
n 0sinI 1＝n 1sinI 2
0≤sin(α 1+α 2-I 2)≤1/n 1
I 2≤α 1+α 2≤I 2+90
-I 2≤β 2-α 1≤90-I 2。
In this occasion, because first limit and the second limit angulation α of thread like body 1, the 4th limit and the 5th limit angulation α 2, and the 4th limit and hexagon angulation β 2, be I in the normal direction at the interface of said air and said base material and the direction angulation of said airborne said light 1, the direction angulation of the said light of the inside of said normal direction and said thread like body is I 2The time, meet the following conditions:
n 0sinI 1＝n 1sinI 2
0≤sin(α 1+α 2-I 2)≤1/n 1
I 2≤α 1+α 2≤I 2+90
-I 2≤β 2-α 1≤90-I 2。
So, can make the light that incides substrate and thread like body can't harm the lost territory and be fetched into the outside in the caustic surface total reflection.
Optical adjusting member of the present invention better is, is n in the refractive index of said thread like body 1, the critical angle in the total reflection at the interface of air that surrounds said base material and said thread like body and said thread like body of said light is I 2max, satisfy sinI 2max=1/n 1, on first limit and second limit and the 4th limit and the 5th limit angulation be respectively α 1And α 2The time, satisfy
α 1+α 2≤2·I 2max。
In this occasion, light is I in the critical angle of the total reflection at the interface of said air and said thread like body 2max, first limit and second limit and the 4th limit and the 5th limit angulation are respectively α 1And α 2The time, at angle sum (α 1+ α 2) at 2I 2maxBelow occasion, with the incident angle of the light of incident irrespectively, incident ray can be in the not total reflection of caustic surface of optical adjusting member, and towards the outside outgoing of optical adjusting member.
In optical adjusting member of the present invention, better be the refractive index of said base material and the refractive index n of said thread like body 1Identical.In this occasion because base material is identical with the refractive index of thread like body, thereby on the composition surface (interface) of base material and thread like body straight ahead only.Therefore, being shaped as arbitrarily of composition surface of base material and thread like body can be made, degree of freedom in design can be increased.In addition, can form base material and thread like body with identical material.
In optical adjusting member of the present invention, also can be that said base material has the refractive index different with the refractive index of said thread like body, form the parallel flat shape and also can.In this occasion; Because base material forms the parallel flat shape; Even thereby have the occasion of the refractive index different at base material with the refractive index of thread like body; Also identical at the refraction angle of base material and the light at the interface of thread like body with the refraction angle at the light at the interface of base material and air of the occasion that has identical refractive index at base material and thread like body, can not add and change ground and use the present invention.
Have again, optical adjusting member of the present invention, the number that better is said each triangle body is more than 2 below 9.Like this, can suppress look fully and separate, simultaneously, can improve light characteristic, just can solve the look separation of above-mentioned emergent light and the problem of luminance shortage with 1 optical adjusting member.Also have, it is whole that the configuration seamlessly on second limit of first cross-section of so-called a plurality of triangle bodies is meant that the state configuration of a plurality of triangle bodies to be in contact with one another, a plurality of triangle bodies cover second limit.
Second embodiment of the invention; A kind of optical adjusting member is provided; It is characterized in that possessing: a plurality of thread like bodies with light transmission that have the base material of light transmission and on said base material, be provided with are roughly triangle with the cross section of the bearing of trend quadrature of said thread like body; Divide to form among 3 limits in this cross section, limit contact abreast with the surface of said base material and in addition among two limits be stepped.
According to Third Way of the present invention, a kind of lighting device is provided, it possesses: light source; According to of the present invention first or the optical adjusting member of second mode; And, be used for from the photoconduction of above-mentioned light source outgoing LGP to above-mentioned optical adjusting member.
According to cubic formula of the present invention, a kind of liquid crystal indicator is provided, it possesses: light source; According to of the present invention first or the optical adjusting member of second mode; Being used for will be from the photoconduction of the above-mentioned light source outgoing LGP to above-mentioned optical adjusting member; And, be configured in above-mentioned optical adjusting member and the liquid crystal display cells opposite side of above-mentioned LGP side.
In lighting device of the present invention and liquid crystal indicator, owing to possess optical adjusting member of the present invention, so as stated, can reduce the number of the optics of formation, slimming and cost degradation that can implement device.Have again, in lighting device of the present invention and liquid crystal indicator,, separate, can improve from the utilization ratio of the light of LGP outgoing simultaneously, can improve light characteristic thereby can suppress look owing to possess optical adjusting member of the present invention.
In lighting device of the present invention and liquid crystal indicator, better be that said optical adjusting member contacts with LGP and disposes.
In lighting device of the present invention and liquid crystal indicator, better be also to possess to be configured in said LGP and the reflection part opposite side of said optical adjusting member side.
Effect of the present invention is following.
Optical adjusting member of the present invention is that the limit in general triangular and this cross section is stair-stepping thread like body through a plurality of and the cross section bearing of trend quadrature are set on base material, thereby utilizes an optical adjusting member just can suppress the look separation of emergent light.In addition; Optical adjusting member of the present invention is because can be having to a certain degree from the LGP outgoing that the direct of travel of the light of the convergence of directive property directly changes on the thickness direction of optical adjusting member; Thereby can improve from the utilization ratio of the light of LGP outgoing, improve light characteristic.That is, adopt optical adjusting member of the present invention, the look that just can suppress emergent light with an optical adjusting member separates, and can improve light characteristic.Have again, can be drawn out to the light that incides optical adjusting member the outside of optical adjusting member effectively.
According to lighting device of the present invention and liquid crystal indicator, owing to possess optical adjusting member of the present invention, can solve the look separation of light and the problem of luminance shortage, also can realize the slimming and the cost degradation of lighting device and liquid crystal indicator simultaneously.
Description of drawings
Fig. 1 is the summary construction diagram of the optics trimmer of embodiment 1.
Fig. 2 is the amplification view of the wire optical structure of embodiment 1.
Fig. 3 is the summary construction diagram of the liquid crystal indicator of embodiment 1.
Fig. 4 is the amplification view of the wire optical structure of embodiment 2.
Fig. 5 is the amplification view of the wire optical structure in second embodiment.
Fig. 6 is the amplification view of the wire optical structure in second embodiment.
Fig. 7 is the light path that sees through the light of wire optical structure in expression second embodiment.
The summary construction diagram of the wire optics constituting body of Fig. 8 (a) when to be base material identical with the refractive index of wire constituting body; (b) be the summary construction diagram of the asynchronous wire optics of the refractive index constituting body of base material and wire constituting body.
Fig. 9 is the summary construction diagram of the wire optical configuration of the 3rd embodiment.
Figure 10 (a) and (b) be the amplification view of wire optical configuration of the embodiment 3 of the 3rd embodiment.
Figure 11 (a) and (b) be the amplification view of wire optical configuration of the embodiment 4 of the 3rd embodiment.
Figure 12 (a) and (b) be the amplification view of wire optical configuration of the embodiment 5 of the 3rd embodiment.
Figure 13 (a) and (b) be the amplification view of wire optical structure of the embodiment 7 of the 3rd embodiment.
Figure 14 is the summary construction diagram of the liquid crystal indicator of comparative example 1.
Figure 15 is the summary construction diagram of the prismatic lens of comparative example 1.
Figure 16 is the summary construction diagram of the liquid crystal indicator of comparative example 2.
Figure 17 is the figure of the state that separates of the look of expression emergent light.
Among the figure:
1-optics trimmer, 2-light source, 3-LGP, 4-reflector plate, 5-diffusion sheet; The 6-lighting device, the 7-display panels, the 10-base material, the 11-first wire prism portion, 11a-cuts open portion for first section; The 12-second wire prism portion, the 12a-second section portion, 12f-caustic surface, 12r-complementary area, 13-wire optical structure; The 13b-cascaded surface, 13c-tabular surface, 52-brightness peak light, 53, the 54-refract light, 100-liquid crystal indicator.
Embodiment
Below, the embodiment to optical adjusting member of the present invention, lighting device and liquid crystal indicator describes with reference to accompanying drawing, but the present invention is not limited thereto.
(first embodiment)
(embodiment 1)
[formation of optics trimmer]
Fig. 1 representes the summary construction diagram of the optics trimmer (optical adjusting member) of embodiment 1.This routine optics trimmer 1 is as shown in Figure 1, is made up of light transmission (transparent) base material 10 of sheet and a plurality of wire optical structures 13 (thread like body) that on base material 10, form.
What use as base material 10 in this example, is polyethylene terephthalate (PET) sheet of thick 50 μ m.Also have, when the ease of processing of considering the optics trimmer, processing etc., the thickness of base material 10 better is the scope at 10～500 μ m.In addition, as the formation material of base material 10, except that PET, can also use inorganic transparent materials such as PEN, tygon, polycarbonate (PC), polyolefin, polypropylene, acetyl cellulose, glass etc., translucent material arbitrarily.As the shape of base material 10, typically be this sheet in this example, but also can use the base material of thicker tabular or arbitrary shape.Have, the surface of base material 10 is not limited to smooth again, also can be three-dimensional face.
Wire optical structure 13 is as shown in Figure 1, is roughly triangle with the cross section of its bearing of trend quadrature, contacts abreast with the surface of base material 10 along a face 13a of its bearing of trend (below be called the bottom surface).That is, wire optical structure 13 is arranged on the base material 10 with the mode on the surface of this bottom surface 13a faces substrate 10.
In addition; In this example, as shown in Figure 1, the shape of a plurality of wire optical structures 13 and size are all identical; Periodically be configured in a plurality of wire optical structures 13 on the direction with its bearing of trend quadrature, and the bottom comer that is configured to adjacent wire optical structure 13 is in contact with one another.Also have, the configuration space of a plurality of wire optical structures 13 (spacing) is preferably about 7～100 μ m.The configuration space of a plurality of wire optical structures 13 needs precision high Mould Machining for being used to form wire optical structure 13 mould of use less than 7 μ m, and cost uprises.In addition, the configuration space of a plurality of wire optical structures 13 especially in the occasion of using flat substrates, can produce following problem greater than 100 μ m.The configuration space of a plurality of wire optical structures 13 is greater than 100 μ m, and it is big that the size of wire optical structure 13 also relatively becomes, and the volume that forms the resin of wire optical structure 13 increases.Hardening of resin amount of contraction when as a result, making hardening of resin form wire optical structure 13 also increases.At this moment, resin is with respect to so-called ' interlock ' grow of mould, and resin is difficult to peel off from mould.Especially, when the mould that uses the cylinder shape forms wire optical structure 13 on flat substrates, can produce that wire optical structure 13 is destroyed when peeling off, wire optical structure 13 remains in the problem of die surface and so on.In addition, if the configuration space of a plurality of wire optical structures 13 is greater than 100 μ m, then, and become thick optical adjusting member because the height of wire optical structure 13 also increases.
In this example, the uv-hardening resin (refractive index 1.60) with fragrant family acrylic ester forms wire optical structure 13.Also have, as the material that forms wire optical structure 13, can utilize refractive index is 1.3～1.9 resin material arbitrarily.In addition; As this example; Using when forming wire optical structure 13 with the formation material material different of base material 10, form material as it, can be transparent plastic resins such as resin with acryl resin or urethane resin, styrene resin, epoxy resin, silicon also.Also have, also can use with base material 10 identical materials and form wire optical structure 13.
In addition; As shown in Figure 1, wire optical structure 13 comprises: forming on the base material 10 and in the upwardly extending first wire prism portion 11 in the side identical with the bearing of trend of wire optical structure 13 be divided on the face of drift angle of the first wire prism portion 11 and form and the upwardly extending second wire prism portion 12 in the side identical with the bearing of trend of wire optical structure 13.Also have, in this example, be described below, the first wire prism portion 11 and the second wire prism portion 12 are integrally formed.That is, in this example, the face 13b of wire optical structure 13 that is formed with a plurality of second wire prism portions 12 stepped (below be also referred to as cascaded surface).Also have, as shown in Figure 1 in this example, on a face of the drift angle that is divided into the first wire prism portion 11, form 3 second wire prism portions 12, but the present invention is not limited thereto.The number of the second wire prism portion 12 or shape can be according to the suitably changes such as optical characteristics of purposes, necessity.In addition, also can the both sides of two faces of the drift angle that is divided into the first wire prism portion 11 the second wire prism portion 12 be set according to purposes, necessary optical characteristics etc.
Shown in Figure 2 is the amplification view of wire optical structure 13.Also have, the incident ray 52 shown in Fig. 2 is illustrated in the light of brightness for advancing on the maximum direction, i.e. brightness peak light in the light characteristic of the light that incides (in optics trimmer 1, advancing) optics trimmer 1.The cross section with its bearing of trend quadrature of wire optical structure 13 is as shown in Figure 2, is made up of first cross-section 11a of the first wire prism portion 11 and the second cross-section 12a of the second wire prism portion 12.
As shown in Figure 2, the base 11b that the first cross-section 11a is contacted by the surface with base material 10 abreast (first limit) and 2 the inclined side 11c (second limit) that extend with the angle (α 1 Fig. 2 and β 1) of regulation respectively at the two ends of 11b from the base and 11d (the 3rd limit) divide and form.In this example; As shown in Figure 2; Be divided among two the inclined side 11c and 11d of the drift angle 11e relative with the base 11b of the first cross-section 11a, the length of the inclined side 11c (second limit) that contacts with the second cross-section 12a is longer than another inclined side 11d (the 3rd limit).Therefore, the angle [alpha] 1 of the base 11b of the first cross-section 11a and the angle between the inclined side 11c (first base angle) is littler than the angle beta 1 at the angle between base 11b and the inclined side 11d (second base angle).That is, in this example, the shape of the first cross-section 11a is made asymmetric triangle (not being isosceles triangle).
In addition; In this example; As shown in Figure 2, the inclined side 11d that makes the first cross-section 11a is roughly the same with respect to the pitch angle (θ among Fig. 2) of base material 10 normal to a surface directions with respect to the direct of travel of the pitch angle of base material 10 normal to a surface directions and brightness peak light 52.That is, make the vergence direction of the face (the face 13c among Fig. 1, below also call tabular surface to this face) of the wire optical structure 13 that comprises the inclined side 11d among (correspondence) Fig. 2 be roughly parallel to the direct of travel of brightness peak light 52.Also have; In this example; Be described below, make the tabular surface 13c of wire optical structure 13 with respect to the angle of inclination (β 1 among Fig. 2) of substrate surface than angle of inclination (90 degree-θ) slightly big of the brightness peak light 52 in the wire optical structure 13 with respect to substrate surface.
First the concrete of cross-section 11a of this example is of a size of, and the length that makes the base 11b of the first cross-section 11a is 35 μ m, and the angle [alpha] 1 at first base angle of the first cross-section 11a is 39.14 degree, and the angle beta 1 at second base angle is 57.71 degree.
As shown in Figure 2, the second cross-section 12a is divided by the base 12b (the 4th limit) that contacts abreast with the inclined side 11c (second limit) of the first cross-section 11a and extend with the angle (α 2 Fig. 2 and β 2) of regulation respectively at the two ends of 12b from the base 2 inclined side 12c and 12d and forms.In this example, as shown in Figure 2, make among two the inclined side 12c and 12d of the second cross-section 12a, be positioned near the length of the inclined side 12d of drift angle 11e one side relative shorter than another inclined side 12c with the base 11b of the first cross-section 11a.Therefore, the angle [alpha] 2 at the base 12b of the second cross-section 12a and the angle between the inclined side 12c (first base angle) is littler than the angle beta 2 at the angle between base 12b and the inclined side 12d (second base angle).That is, in this example, the shape of the second cross-section 12a is made asymmetric triangle (not being isosceles triangle).
Also have; The face 12f of the second wire prism portion 12 that comprises the inclined side 12c (the 5th limit or hexagon) of the second cross-section 12a; Being described below, mainly is to make the face of the direct of travel of incident ray to the thickness direction refraction of optics trimmer 1, promptly has the face of the effect that makes the incident ray convergence.Therefore, below, caustic surface called to the face 12f of the inclined side 12c that comprises this second cross-section 12a.On the other hand; The face 12r of the second wire prism portion 12 that comprises another inclined side 12d (the 5th limit or hexagon) of the second cross-section 12a; Be described below owing to mainly work to suppress look separation from the emergent light of optics trimmer 1, thereby below be called complementary area.
As this routine optics trimmer 1; Through making the length that is positioned at away from the inclined side 12c of the second cross-section 12a of the side of the drift angle 11e of the first cross-section 11a longer than another inclined side 12d; Can make the caustic surface 12f of the second wire prism portion 12 (wire optical structure 13) wideer, can increase the utilization ratio of incident ray.
In addition; In this example; As shown in Figure 2, angle [alpha] 2 and the β 2 that sets first and second base angle of the second cross-section 12a makes that the refractive direction of the refractive direction of the light 53 when the brightness peak light 52 that incide optics trimmer 1 reflects by the caustic surface 12f of the second wire prism portion 12 and the light 54 when reflect by the complementary area 12r of the second wire prism portion 12 is reciprocal with respect to the direct of travel that reflects preceding brightness peak light 52.In addition; In this example; The provision wavelengths composition of the light 53 when angle [alpha] 2 and the β 2 that sets first and second base angle of the second cross-section 12a makes and reflected by the caustic surface 12f of the second wire prism portion 12 (for example; The refractive direction of the provision wavelengths composition (for example, the wavelength A composition 54A among Fig. 2) of the light 54 of the angle (γ among Fig. 2) between the direct of travel of brightness peak light 52 before the refractive direction wavelength A composition 53A among Fig. 2) and the refraction when reflect by the complementary area 12r of the second wire prism portion 12 is roughly the same with the angle between the direct of travel that reflects preceding brightness peak light 52.Through adopting such formation, can further suppress look separation from the emergent light of optics trimmer 1.
Also have; So long as separate in the scope of the degree that can suppress fully at look from the emergent light of optics trimmer 1; Angle between the direct of travel of brightness peak light 52 before the refractive direction of the provision wavelengths composition of the light 53 when being reflected by the caustic surface 12f of the second wire prism portion 12 and the refraction, the refractive direction of the provision wavelengths composition of the light 54 when reflect by the complementary area 12r of the second wire prism portion 12 is different with the angle between the direct of travel that reflects preceding brightness peak light 52 also can.
The second cross-section 12a of this example specifically is of a size of, and the length that makes the base 12b of the second cross-section 12a is 10.44 μ m, and the angle [alpha] 2 at first base angle of the second cross-section 12a is 30 degree, and the angle beta 2 at second base angle of the second cross-section 12a is 70 degree.
Also have; In this example; Make the shape and the size of 3 second wire prism portions 12 all identical, periodically be configured in 3 second wire prism portions 12 on the direction with its bearing of trend quadrature, and the bottom comer that is configured to the second adjacent wire prism portion 12 is in contact with one another.That is, in this example, make the cascaded surface 13b that constitutes wire optical structure 13 a plurality of second wire prism portions 12 caustic surface 12f and complementary area 12r is parallel to each other respectively and the structure of configuration equally spaced.
[manufacturing approach of optics trimmer]
The manufacturing approach of the optics trimmer 1 that this is routine is following.Be ready to be formed with cylinder shape mould from the teeth outwards by the corresponding relief pattern of the shape of the optical structure of forming with a plurality of wire optical structures 13 shown in Figure 1 with cut.Then, between ready base material 10 and die surface, fill ultraviolet hardening resin, the ultraviolet ray of illumination wavelength 340～420nm makes the ultraviolet hardening resin sclerosis of filling.Then, peel off base material 10 from mould.In this example, on base material 10, obtain being formed with the optics trimmer 1 of a plurality of wire optical structures 13 that constitute by ultraviolet hardening resin like this.
Also have, the manufacturing approach of optics trimmer of the present invention is not limited to said method, can use known any means.For example; Make base material with thermoplastic resin; Heating is pushed with cut and is formed with the mould by the corresponding relief pattern of the shape of the optical structure of forming with a plurality of wire optical structures from the teeth outwards on base material, the thermal transfer of the relief pattern through roller mould etc. on this substrate body directly the formation optical structure also can.In addition, the injection moulding etc. that injects melting resin with well-known extrusion moulding or extrinsion pressing or in mould forms the optical structure of being made up of a plurality of wire optical structures on base material also passable.In this occasion, form base material and wire optical structure with identical materials.
[liquid crystal indicator and lighting device]
The general configuration of the liquid crystal indicator that has been to use this routine optics trimmer 1 shown in Figure 3.Also having, among Fig. 3, for the structure of easy to understand liquid crystal indicator, put down in writing and separate each optics, is to be piled up with each optics state of contact in the device of reality.This routine liquid crystal indicator 100 is as shown in Figure 3, is made up of display panels 7 (liquid crystal display cells), back light unit 6 (lighting device).
Display panels 7 is used display panels used in original liquid crystal indicator.Specifically; Do not illustrate at this, but make the structure of display panels 7 adopt the structure of nesa coating, color filter, glass substrate and Polarizer of nesa coating, alignment films, liquid crystal film, alignment films, the formation confronting electrode of lamination Polarizer, glass substrate, formation pixel electrode successively.
Back light unit 6 is as shown in Figure 3, mainly comprises: light source (LED: light emitting diode) 2; Make LGP 3 from the light 50 of sidepiece incident from upper surface 3a (exit facet) outgoing; Be configured in the reflector plate 4 (reflection part) of the bottom (side opposite) of LGP 3 with display panels 7; Be configured in this routine optics trimmer 1 on the top (display panels 7 sides) of LGP 3; And the diffusion sheet 5 that is configured in the top of optics trimmer 1.
Send the white light of visible region from light source 2.This routine back light unit 6 is lighting devices of edge light mode, and light source 2 is located at the sidepiece of LGP 3.Sidepiece incident from the light of light source 2 outgoing from LGP 3, portion advances and from exit facet 3a outgoing to the direction of light 50 within it.This emergent light 51 is typically is becoming the light of the convergence of directive property to a certain degree that has with brightness peak from the LGP normal to a surface direction direction that direct of travel (direction of light 50) tilts in the LGP of light.Therefore, optical adjusting member of the present invention is particularly suitable for the lighting device that waits backlight of edge light mode.Also have, at this moment, the cascaded surface 13b that need be installed in wire optical structure 13 to optical adjusting member of the present invention for the main sensitive surface of the incident ray 52 of this inclination towards, promptly shown in Figure 3 towards.
What the optics beyond the optics trimmer 1 used is the parts identical with the optics of original back light unit.Specifically, LGP 3 usefulness polycarbonate form.Also have, in this example, uses that to have from the brightness of the light 51 of the exit facet 3a outgoing of LGP 3 be the LGP 3 of the 70 outgoing characteristics spent as the direction (direction of brightness peak light) of maximum and with respect to the angle between the direction of the normal direction of exit facet 3a.Therefore; From the emergent light of LGP 3 51 if incide optics trimmer 1; Then light 51 is by the refraction of the lower surface of the base material 10 of optics trimmer 1, and the direct of travel of the brightness peak light of light 51 is about 36 degree with respect to the tiltangle of base material 10 normal to a surface directions (thickness direction of optics trimmer 1).That is the tiltangle of direct of travel that, incides the brightness peak light 52 of optics trimmer 1 is adjusted to bigger slightly than vergence direction and the angle between the base material 10 normal to a surface directions (90 degree-α 1=32.29 degree) of the tabular surface 13c of the wire optical structure 13 of optics trimmer 1.
Reflector plate 4 is used the sheet material that silver is arranged at the surperficial vapor deposition of PET film.In addition, to diffusion sheet 5 sheet of PET film that used the bead coatings, making its thickness is 70 μ m, and mist degree is 30%.
[suppressing the principle that look separates]
Secondly, describe with reference to separating repressed principle from the look of the light of optics trimmer 1 outgoing in pair this routine optics trimmer 1 of Fig. 1～3.
When inciding this routine optics trimmer 1 from the emergent light 51 of LGP 3, this incident ray is mainly by the cascaded surface 13b of wire optical structure 13, i.e. the second wire prism portion, 12 refractions.Also have; The vergence direction of the tabular surface 13c of wire optical structure 13 as stated since with the direct of travel almost parallel of the brightness peak light 52 of the light that incides optics trimmer 1, thereby smaller in the influence of the refraction of the incident ray of this tabular surface 13c.
The brightness peak light 52 that incides the cascaded surface 13b of wire optical structure 13 is divided 2 faces, i.e. the caustic surface 12f and the complementary area 12r refraction of the second wire prism portion 12 of each convex surface (each end difference surface) that forms cascaded surface 13b.At this moment; Brightness peak light 52 is as shown in Figure 2 by thickness direction (the base material 10 normal to a surface directions) refraction (light 53 in Fig. 2) of the caustic surface 12f of the second wire prism portion 12 to optics trimmer 1, in then direction (direction in the face of base material 10) refraction (light 54 among Fig. 2) in the face of optics trimmer 1 of complementary area 12r.That is, by the direct of travel of the light 53 of the caustic surface 12f of the second wire prism portion 12 refraction and reciprocal by the direct of travel of the direct of travel of the light 54 of the complementary area 12r refraction brightness peak light 52 preceding with respect to refraction.
In addition; When brightness peak light 52 incides the cascaded surface 13b of wire optical structure 13 and is reflected; Because the refractive index of the formation material of wire optical structure 13 is difference with the wavelength of the light of incident; So the refraction angle is different, as shown in Figure 2 because of contained each wavelength components in the brightness peak light 52, refract light 53 and 54 look separate and have just produced.Also have, in Fig. 2, for the purpose of simplifying the description, represent the separation of 2 wavelength components (wavelength A and B, wavelength A＞wavelength B).Light 53A among Fig. 2 and 54A represent the refract light of wavelength A composition, and light 53B and 54B represent the refract light of wavelength B composition, and the refraction of the ratio of refraction wavelength A composition of shown in Figure 2 is wavelength B composition is the situation of big (refraction angle is big) more.
When brightness peak light 52 is reflected by the caustic surface 12f of the second wire prism portion 12; As shown in Figure 2; Because the wavelength B composition 53B of refract light 53 is bigger than wavelength A composition 53A refraction, thereby the more direction of the arrow A in Fig. 21 of (refraction) direction ratio wavelength A composition 53A of advancing of wavelength B composition 53B.On the other hand; When brightness peak light 52 is reflected by the complementary area 12r of the second wire prism portion 12; Because the wavelength B composition 54B of refract light 54 is reflected than wavelength A composition 54A biglyyer, so the direct of travel of wavelength B composition 54B is than the wavelength A composition 53A direction of the arrow A in Fig. 22 more.Promptly; By the separation of the color (wavelength) of the light 53 of the caustic surface 12f of the second wire prism portion 12 refraction with by the separation of the color (wavelength) of the light 54 of the complementary area 12r of the second wire prism portion 12 refraction; As shown in Figure 2, become reciprocal pattern with respect to the direct of travel of brightness peak light 52.Therefore; Separated by being separated by the look of the light 54 of the complementary area 12r of the second wire prism portion 12 refraction by the look of the light 53 of the caustic surface 12f of the second wire prism portion 12 refraction and to offset, the look of the light on 1 outgoing of optics trimmer and the liquid crystal display face of being focused at separates and is suppressed.
As stated, this routine optics trimmer 1 is owing to can enough 1 piece of optical sheets suppress the look of emergent light and separate, thereby need not use 2 pieces of prismatic lenses for the look separation that suppresses emergent light as original.In addition; As stated; This routine optics trimmer 1 is owing to directly change to the thickness direction of optics trimmer 1 to the direct of travel from the emergent light (oblique light) of the LGP of the converging light with directive property to a certain degree, thereby need as original, the bottom diffusion sheet be set between prismatic lens group and LGP.Therefore, owing to need as original, not use the bottom diffusion sheet temporarily to transform to wide cut light to converging light with certain directive property from the LGP outgoing, thus can improve from the utilization ratio of the light of LGP outgoing, and improve light characteristic.
In addition, the liquid crystal indicator 100 and the back light unit 6 of edge light mode that possesses this routine optics trimmer 1 is as shown in Figure 3, for the look that suppresses emergent light separates, need not use 2 pieces of prismatic lenses, and, need not use the bottom diffusion sheet.Therefore, the liquid crystal indicator 100 of the edge light mode that this is routine and back light unit 6 with compared the number that can reduce optics originally, slimming and cost degradation that can implement device.
[optical characteristics evaluation]
The liquid crystal indicator 100 of example shown in Figure 3 and the optical characteristics of back light unit 6 are estimated.Specifically, use nitometer to carry out the mensuration of front face brightness.In addition, estimate with the visual sensory function who has carried out color.Specifically, main from the color of frontal visualization from the emergent light of back light unit, the homogeneity of the color of investigation emergent light.
At this,, original liquid crystal indicator 500 shown in Figure 14 (comparative example 1) is also carried out above-mentioned evaluation for relatively.Also have, the width that is shaped as the base 30 μ m, height 15 μ m, the isosceles triangle of drift angle 90 degree in cross section of the bearing of trend quadrature of the prism-like tectosome on prism 507a and the 507b made and be formed to the liquid crystal indicator 500 of comparative example 1 shown in Figure 14.The base material 507c of each prismatic lens 507a forms with the PET film, and prism-like tectosome 507d forms with UV cured type propylene resin.In addition, to bottom diffusion sheet 506 sheet material of PET film that used the bead coatings, its thickness is 70 μ m, and mist degree is 85%.Formation optics beyond prism group 507 and the bottom diffusion sheet 506 uses the used identical parts of parts in the liquid crystal indicator 100 with embodiment 1.
Have again,, for relatively, the liquid crystal indicator 600 (comparative example 2) of formation shown in Figure 16 has also been carried out above-mentioned evaluation at this.Also have, the liquid crystal indicator 600 of comparative example 2 shown in Figure 16 is the devices that replace the interior optics trimmer 1 of the liquid crystal indicator 100 of embodiment shown in Figure 31 with one piece of original prismatic lens 507a shown in Figure 15.Except optical adjusting member being used the original prismatic lens 507a, adopt the formation same with the liquid crystal indicator of embodiment 1 100.
The above-mentioned evaluation result of below table 1 expression.In table 1, also put down in writing piece number of the optical sheet that is configured between LGP and the liquid crystal panel.Also have, front face brightness is that the front face brightness with comparative example 1 is benchmark (100%).In addition, the inhomogeneity evaluation ◎ of the color of table 1 and * benchmark following.In addition, in below table 1, the evaluation result of the embodiment 2 that has stated after also having put down in writing in the lump.
◎: being all white from the color of the emergent light 55 of back light unit 6 mutually with emergent light 50 from light source, is the different extent that can not differentiate both through visual.
*: the emergent light 55 from back light unit 6 has colors such as redness, yellow, be can Visual Confirmation degree.
Table 1
Front face brightness Color homogeneity Piece number of optical sheet
Embodiment
1 107％ ◎ 2
Embodiment 2 112％ ◎ 2
Comparative example 1 100％ ◎ 4
Comparative example 2 73％ × 2
Can know that from table 1 liquid crystal indicator of embodiment 1 is compared with the liquid crystal indicator of comparative example 1 (Figure 14), can improve front face brightness and can reduce the number of optical sheet.That is, slimming, cost degradation that the liquid crystal indicator of embodiment 1 can implement device can improve optical characteristics simultaneously.In addition, the liquid crystal indicator of embodiment 1 can be known from table 1, compares with the liquid crystal indicator of comparative example 2 (Figure 16), and front face brightness and color homogeneity can both improve.
The optics trimmer of the foregoing description 1 is illustrated the shape and the whole identical occasions of size of a plurality of second prism tectosomes of formation wire optical structure, but the present invention is not limited thereto.The shape of a plurality of second prism tectosomes similar figures each other also can.This occasion is because the caustic surface and the complementary area of a plurality of second prism tectosomes be parallel to each other respectively, so also obtain the effect same with embodiment 1.
The optics trimmer of the foregoing description 1 further improves display quality, and also disposed diffusion sheet on the top of optics trimmer, but the present invention is not limited thereto in order further to improve unequal from the brightness of the emergent light of optics trimmer.For example, from the enough good occasion of the quality of the emergent light of optics trimmer (brightness unequal done one's utmost suppress occasion) or do not need to use occasion of the present invention in the purposes of high-quality display performance, do not use diffusion sheet passable yet.
The liquid crystal indicator and the lighting device that use in the foregoing description 1 just are illustrated the example that has disposed reflector plate in a side opposite with optics trimmer one side of LGP, but the present invention is not limited thereto.For example, have the occasion of the structure (sag and swell etc.) that obtains enough reflexs, do not use reflector plate also passable on the surface of a side opposite with optics trimmer one side of LGP.
(embodiment 2)
Optics trimmer of the present invention constitutes the position and the area ratio of number, the caustic surface in the cascaded surface and complementary area of the second wire prism portion of the cascaded surface of wire optical structure through adjustment; Perhaps adjust the angle of inclination of caustic surface or complementary area etc. as required, can adjust balance from optical characteristics such as the brightness of the emergent light of optics trimmer or chromatic dispersions.The optics trimmer of embodiment 2 changes with respect to embodiment 1 on number, shape and the size of the second wire prism portion with the light mode many relatively with respect to complementary area that incides caustic surface.In addition, adopt with the same formation of embodiment 1 and form material.
The amplification view of the wire optical structure of the optics trimmer of shown in Figure 4 is embodiment 2.This routine wire optical structure 24 is as shown in Figure 4 to be general triangular in the cross section with its bearing of trend quadrature, along a face (face that comprises base 21b of its bearing of trend.Below be also referred to as the bottom surface) contact abreast with the surface of base material 20.That is, wire optical structure 24 is located on the base material 20 with the surperficial relative mode of its bottom surface and base material 20.Also have, the incident ray 52 shown in Fig. 4 is illustrated in the light of brightness in light characteristic for advancing on the maximum direction that incides the light on this routine optics trimmer, i.e. brightness peak light.
Wire optical structure 24 and cross section its bearing of trend quadrature, as shown in Figure 4, constitute by the first cross-section 21a, variform 2 the second cross-section 22a and the 23a that on the limit of the first cross-section 21a, are provided with.Promptly; In this example, on a face of the first wire prism portion (the wire optical structure corresponding) of wire optical structure 24, be provided with variform 2 second wire prism portions (with the second cross-section 22a and the corresponding linear structure body of 23a) with the first cross-section 21a.As shown in Figure 4,2 second cross-section 22a and 23a are arranged to mutual bottom comer and join.
As shown in Figure 4, the base 21b that the first cross-section 21a is contacted by the surface with base material 20 abreast (first limit), 2 the inclined side 21c (second limit) that extend with the angle (α 1 Fig. 4 and β 1) of regulation respectively at the two ends of 21b from the base and 21d (the 3rd limit) divide and form.In this routine optics trimmer, the shape of the first cross-section 21a (shape of the first wire prism portion) is identical with embodiment 1.That is, the angle [alpha] 1 at first and second base angle of the first cross-section 21a and β 1 are respectively 39.14 degree and 57.71 degree, and the length of the base 21b of the first cross-section 21a is 35 μ m.
Also have; In this example; As shown in Figure 4, the inclined side 21d that makes the first cross-section 21a is also identical with embodiment 1 with the relation at pitch angle (θ among Fig. 4) of direct of travel of brightness peak light 52 on inciding the optics trimmer with respect to the pitch angle of base material 20 normal to a surface directions.That is, make vergence direction and the direct of travel almost parallel of brightness peak light 52 of face (tabular surface) of the wire optical structure 24 of the inclined side 21d that comprises among Fig. 4.More particularly, the tabular surface that makes wire optical structure 24 with respect to the angle of inclination (β 1 among Fig. 4) on base material 20 surfaces and embodiment 1 identically than angle of inclination (90 degree-θ) slightly big of the brightness peak light 52 in the wire optical structure 24 with respect to base material 20 surfaces.
Being arranged in the second cross-section 22a of the first base angle side (α 1 side of Fig. 4) of the first cross-section 21a as shown in Figure 4 is to form by dividing with the base 22b (the 4th limit) of the parallel contact of inclined side 21c (second limit) of the first cross-section 21a, extend with the angle (α 2 of Fig. 4 and β 2) of regulation respectively at the two ends of 22b from the base 2 inclined side 22c and 22d.Also have, in this example, the shape of the second cross-section 22a is made the similar figures with the second cross-section 12a of embodiment 1, makes angle [alpha] 2 and the angle beta 2 at second base angle at first base angle of the second cross-section 22a be respectively 30 degree and 70 degree.And, in this routine optics trimmer, make the base 22b of the second cross-section 22a be about 14.92 μ m, longer than the base 12b (about 10.44 μ m) of the second cross-section 12a of embodiment 1.That is, in this routine optics trimmer, make the area of the second cross-section 22a of the first base angle side (α 1 side of Fig. 4) that is arranged in the first cross-section 21a bigger than the area of the second cross-section 12a of embodiment 1.
Also have; The face of wire optical structure 24 (the second wire prism portion) that comprises the inclined side 22c (the 5th limit or hexagon) of the second cross-section 22a mainly is to make the face of the direct of travel of incident ray to the thickness direction refraction of optics trimmer; That is the face (caustic surface) that, has the effect that makes incident ray optically focused.On the other hand, the face of wire optical structure 24 that comprises the opposing party's of the second cross-section 22a inclined side 22d (the 5th limit or hexagon) mainly is the face (complementary area) with effect that inhibition separates from the look of the emergent light of optics trimmer.That is, in this example, the area of caustic surface of the second wire prism portion that makes the base angle side (α 1 side of Fig. 4) of the first wire prism portion that is arranged in bigger than embodiment 1.
Like this, the caustic surface of the second wire prism portion through making the base angle side (α 1 side of Fig. 4) of the first wire prism portion that is arranged in becomes wideer, can improve the utilization ratio of incident light, increases brightness.It the reasons are as follows.Face (the face that comprises the second limit 21c among Fig. 4 of the first wire prism portion through being formed with the second wire prism portion; The second wire prism portion that below is also referred to as forms face) light; The light that promptly incides the cascaded surface of optics trimmer comprises the light composition beyond the brightness peak light 52, the second wire prism portion through the first wire prism portion form face light intensity (illumination) because of second wire prism portion formation face to pass through the position different.Specifically, the second wire prism portion through the first wire prism portion forms the intensity of light of face the base angle side (first base angle, 1 side among Fig. 4) near the first wire prism portion is just big more more.That is, incide the light of the second wire prism portion of the base angle side that is positioned at the first wire prism portion, its intensity strong (illumination is high).Therefore, as this example, the caustic surface of the second wire prism portion through being positioned at the first wire prism portion base angle side is wideer, owing to can gather more high-intensity high light line, thus can improve the utilization ratio of incident ray, increase the brightness of emergent light.
On the other hand; The second cross-section 23a of drift angle 21e side that is positioned at the first cross-section 21a is as shown in Figure 4; Be roughly triangle, form by dividing with the base 23b (the 4th limit) of the parallel contact of inclined side 21c (second limit) of the first cross-section 21a and extend with the angle (α 2 Fig. 4 and β 3) of regulation respectively at the two ends of 23b from the base 2 inclined side 23c and 23d.In addition, as shown in Figure 4 in this example, the inclined side 23d (the 5th limit or hexagon) so that 2 limit 23f and 23g constitute the drift angle 21e side that is positioned at the first cross-section 21a makes the shape that makes inclined side 23d become convex towards the outside curve of the second cross-section 23a.
Constitute among 2 the limit 23f and 23g of inclined side 23d, be positioned at that the limit 23f of inclined side 21d side of the first cross-section 21a is as shown in Figure 4 to be extended from the drift angle 21e of the first cross-section 21a and the inclined side 21d of the first cross-section 21a abreast.Therefore, the angle beta 3 at the base 23b of the second cross-section 23a and the angle between the inclined side 23d (second base angle) is α 1+ β 1.In addition, another limit 23g of formation inclined side 23d is parallel with the inclined side 22d of the second cross-section 22a of the first base angle side that is positioned at the first cross-section 21a.That is, in this example, inclined side 23c and limit 23f and the 23g that constitutes the second cross-section 23a is parallel with the inclined side 22d of the inclined side 21d of the inclined side 22c of the second cross-section 22a and the first cross-section 21a and the second cross-section 22a respectively.The angle [alpha] 2 that makes first base angle of the second cross-section 23a is 30 degree, and the angle beta 3 that makes second base angle of the second cross-section 23a is 96.85 degree.
Also have; The second cross-section 23a in the drift angle 21e side that is arranged in the first cross-section 21a; The face that comprises the wire optical structure 24 (the second wire prism portion) of its inclined side 23c (the 5th limit or hexagon) mainly is to make the face of the direct of travel of incident ray to the thickness direction refraction of optics trimmer; That is the face (caustic surface) that, has the effect that makes incident ray optically focused.On the other hand; Because it is parallel with the inclined side 21d of the first cross-section 21a divide to form the limit 23f of the inclined side 21d side that is positioned at the first cross-section 21a among limit 23f and the 23g of second another inclined side of cross-section 23a 23d, thereby comprise the vergence direction and brightness peak light 52 almost parallels of face of the wire optical structure 24 of limit 23f.Therefore, at the face of the wire optical structure 24 that comprises limit 23f, the refraction of incident light and the influence of reflection are little.In addition, the face that comprises the wire optical structure 24 of another limit 23g that divide to form inclined side 23d mainly becomes the face (complementary area) that performance suppresses the effect that the look from the emergent light of optics trimmer separates.Therefore, in this example, the area that the shape of the second cross-section 23a is made the caustic surface that makes the second wire prism portion corresponding with the second cross-section 23a is big as far as possible, and, make the as far as possible little shape of complementary area.
For this routine optics trimmer of above-mentioned structure, same with embodiment 1, estimated its optical characteristics.Specifically, this routine optics trimmer (replace the optics trimmer 1 of the embodiment 1 among Fig. 3 and this routine optics trimmer is installed) is installed on liquid crystal indicator shown in Figure 3 100 and back light unit 6, is carried out the mensuration of front face brightness with nitometer.In addition, estimate with the visual sensory function who has carried out color.Its result is documented in above-mentioned table 1.
Can know that from table 1 in the occasion of using this routine optics trimmer, front face brightness is 112%, can make front face brightness higher than the occasion (107%) of embodiment 1.This is considered to; In this routine optical adjusting member; As stated, the caustic surface of the second wire prism portion (the linear structure body corresponding) that constitutes the first wire prism portion that is positioned among a plurality of second wire prism portions of wire optical structure base angle side wideer than embodiment 1 with the second cross-section 22a.In addition; In this routine optics trimmer; As stated, adopt the littler structure of auxiliary surface of the second wire prism portion corresponding with the second cross-section 23a of the drift angle 21e side that is positioned at the first wire prism portion, as shown in table 1; For the homogeneity of color, embodiment 1 and 2 does not confirm tangible difference.That is,, also can access sufficient optical property even use liquid crystal to the optics trimmer of this routine this structure with in the various lighting devices such as back light unit.
[second embodiment]
As second embodiment of the present invention, the brightness peak light that the inventor has investigated incident can see through the cross sectional shape of first, second wire prism portion of optical adjusting member not by the caustic surface total reflection.As follows, optics trimmer of the present invention constitutes the first wire prism portion of wire optical structure and the cross sectional shape of the second wire prism portion through adjustment, also can adjust the optical characteristics such as transmitance of the brightness peak light of incident.
The amplification view of the wire optical structure of the optics trimmer 1B of shown in Figure 5 is second embodiment.As shown in Figure 5, the wire optical structure 34 of second embodiment has the formation same with the wire optical structure of the embodiment 1 of first embodiment 13.
At this, as shown in Figure 5, the occasion of the bottom surface 10a of base material 10 is incided in consideration from the brightness peak light 51 of exit facet 3a (with reference to Fig. 3) outgoing of LGP 3.Base material 10 and wire optical structure 34 are all by refractive index n 1Optical material form.The outside of base material 10 and wire optical structure 34 is by air (refractive index n 0=1.0) surround.
Same with embodiment 1, define the first limit 31b, the second limit 31c and the 3rd limit 31d of the first cross-section 31a of the first wire prism portion 31, the 4th limit 32b of the second cross-section 32a of the second wire prism portion 32, the 5th limit 32c and hexagon 32d.In addition, make the 5th limit 32c that comprises the second wire prism portion 32, the face of hexagon 32d be respectively caustic surface 32f, auxiliary surface 32r.In Fig. 5, making the line of the hexagon 32d that prolongs the second cross-section 32a is L1, and the line that prolongs the 5th limit 32c of the second cross-section 32a is L2.In addition, making the line vertical with L1 is L3, and the line vertical with L2 is L4.Have, making the crossing angle of the first limit 31b of the L1 and the first cross-section 31a is P1 again, and making the crossing angle of the first limit 31b of the L4 and the first cross-section 31a is P2.At this moment, angle P1, P2 are expressed from the next respectively.
(formula 1)
P 1＝β 2-α 1
P 2＝90-α 1-α 2
As shown in Figure 6, brightness peak light 51 incides the bottom surface 10a of the base material 10 of optics trimmer 1B, is reflected by the interface of the bottom surface 10a of air and base material 10 (first interface).Make brightness peak light 51 at this moment be respectively I with respect to the incident angle and the refraction angle at first interface 1, I 2, advanced at optics trimmer 1B internal communication by the brightness peak light 52 of first interfacial refraction to the caustic surface 32f of the second wire prism portion 32 and the interface (second contact surface) of air.By of the outside outgoing of the brightness peak light 53 of second contact surface refraction towards optics trimmer 1B.Make at incident angle, the refraction angle of the brightness peak light of second contact surface and be respectively I 3, I 4
At this, the incident angle I at the interface at air and base material 10 of brightness peak light 51 (first interface) 1And emergence angle (refraction angle) I 2Relation represent as follows by Snell law.
(formula 2)
n 0sinI 1＝n 1sinI 2
Likewise, the incident angle I at caustic surface 12f (second contact surface) of brightness peak light 52 3And emergence angle (refraction angle) I 4Relation represent as follows.
(formula 3)
n 1sinI 3＝n 0sinI 4
At this, brightness peak light 52 is in the condition of not total reflection of caustic surface 12f, that is brightness peak light 53 is towards the condition of the outside outgoing of the optics trimmer 1B refractive index n at air 0Be expressed from the next in=1.0 o'clock.
(formula 4)
0≤sinI 3≤1/n 1
At this, because the incident angle I at caustic surface 12f of brightness peak light 52 3Size be (α 1+ α 2-I 2), so formula 4 is represented as follows.
(formula 5)
0≤sin(α 1+α 2-I 2)≤1/n 1
At this, emergence angle (refraction angle) I at the interface of air and base material 10 of brightness peak light 51 2Be through incident angle I at first interface 1Refractive index n with base material 10 and wire optical structure 34 1And well-determined amount.That is, the material of base material 10 and wire optical structure 34 is confirmed (refractive index n 1Confirm), brightness peak light 51 is with respect to the incident angle I at first interface 1Confirm, by formula 3, the refraction angle I of brightness peak light 52 2Confirm.Like this, with respect to the refraction angle I that has confirmed 2, can set the angle (α that satisfies formula 6 1+ α 2) scope.
Secondly, consider incident angle I arbitrarily 1, satisfy this angle (α 1+ α 2) condition (necessary condition).Make the refraction angle I that satisfies formula 2 and formula 5 2Maximal value be I 2max, derive following formula from formula 2 and formula 5.
(formula 6)
sinI 2max＝1/n 1
sin(α 1+α 2-I 2max)＝1/n 1
Therefore, brightness peak light 52 at second contact surface with the angle incident below the critical angle, for the brightness peak light 53 that total reflection does not take place shines the outside of optics trimmer 1B, angle (α 1+ α 2) formula must meet the following conditions.
(formula 7)
α 1+α 2≤2·I 2max
Secondly, consider to make brightness peak light 52 incide the condition of caustic surface 12f.In order to incide the caustic surface 32f of the second wire prism portion 32, must make 0≤I at the brightness peak light 52 of optics trimmer 1B internal communication 3≤90.Like this, obtain following conditional.
(formula 8)
0≤I 3＝-I 2+α 1+α 2≤90
I 2≤α 1+α 2≤I 2+90
Secondly, consider that with reference to Fig. 7 brightness peak light 52 incides the condition of auxiliary surface 12r.As shown in Figure 7, make at incident angle, the refraction angle of the brightness peak light 52 of auxiliary surface 32r and be respectively I 5, I 6In order to incide the auxiliary surface 32f of the second wire prism portion 32, must make 0≤I at the brightness peak light 52 of optics trimmer 1B internal communication 5≤90.At this, because I 5=β 2-α 1+ I 2Thereby, obtain following conditional.
(formula 9)
0≤I 5＝β 2-α 1+I 2≤90
-I 2≤β 2-α 1≤90-I 2
More than comprehensive, brightness peak light 52 is in the condition of not total reflection of caustic surface 32f, that is brightness peak light 52 is represented with above-mentioned formula 5 towards the condition of the outside outgoing of optics trimmer 1B.But, the light that incides first interface with incident angle arbitrarily at second contact surface with the angle incident below the critical angle, in order to shine the outside of optics trimmer 1B, angle (α at least in not total reflection of caustic surface 1+ α 2) need satisfy formula 7.Have again; The condition of caustic surface 32f that is used to the second wire prism portion 32 of inciding at the brightness peak light 52 of optics trimmer 1B internal communication is with above-mentioned formula 8 expressions, and the condition of auxiliary surface 32f that is used to the second wire prism portion 32 of inciding at the brightness peak light 52 of optics trimmer 1B internal communication is with above-mentioned formula 9 expressions
At this, with embodiment 1 likewise, consider the incident angle I to the bottom surface 10a of the base material 10 of optics trimmer 1B of brightness peak light 51 1It is the occasion of 70 degree.Because the refractive index n of optics trimmer 1B 1Be 1.60, so according to above-mentioned formula 2, I 2=35.97 degree.With the above-mentioned formula 5 of this substitution, obtain α 1+ α 2≤74.65, the above-mentioned formula 8 of substitution obtains 35.97≤α 1+ α 2≤125.97.Comprehensive above result obtains 35.97≤α 1+ α 2≤74.65.Have again, obtain-35.97≤β from above-mentioned formula 9 2-α 1≤54.03.
As stated, optics trimmer 1B is optics trimmer 1 identical construction with the embodiment 1 of first embodiment.The angle [alpha] at first base angle of the first wire prism portion of optics trimmer 1B 1Size be 39.14 the degree, the angle beta at second base angle 1Size be 57.71 the degree.In addition, the angle [alpha] at first base angle of the second wire prism portion 2Size be 30 the degree, the angle beta at second base angle 2Size be 70 the degree.At this moment, angle (α 1+ α 2) be 69.14 degree, angle (β 2-α 1) be 30.86 degree.Therefore, angle (α among the optics trimmer 1B 1+ α 2) and angle (β 2-α 1) satisfy above-mentioned condition (35.97≤α 1+ α 2≤74.65, and-35.97≤β 2-α 1≤54.03).
At this, obtain α from above-mentioned formula 7 1+ α 2≤71.94.This means when the optical material that uses refractive index 1.60 is made optics trimmer 1B, through with α 1+ α 2Be set in below 71.94 degree, with the incident angle of brightness peak light irrespectively, the brightness peak light of incident can be towards the outside outgoing of optics trimmer 1B in the not total reflection of caustic surface of optics trimmer 1B.
The occasion of this embodiment is owing to incide the incident angle I of the brightness peak light 51 of optics trimmer 1B 1Be set to 70 degree, so as stated, set angle α 1, α 2Make angle [alpha] 1+ α 2Below 74.65 degree, in the occasion of the highest brightness peak light incident of brightness, can total reflection not take place and reflect at caustic surface 12f, can take out effectively from optics trimmer 1B.Furtherly, it is the angle distribution of peak value that the incident ray that in fact incides optics trimmer 1B has the angle that makes brightness peak light, through set angle α 1, α 2Make angle [alpha] 1+ α 2Below 71.94 degree, can make the incident ray of incident angle arbitrarily the refraction of total reflection ground not take place at caustic surface 12f, can take out effectively from optics trimmer 1B.
Like this, the shape through adjustment optics trimmer makes and at caustic surface total reflection does not take place, can improve the front face brightness of optics trimmer.At this; Because frontal brightness that is contributive to the light quantity of the normal direction outgoing of the bottom surface (substrate surface) of the base material of optics trimmer be caustic surface, the shape of therefore adjusting the optics trimmer makes that at caustic surface total reflection not to take place at least very important for improving front face brightness expeditiously.In other words, it is just passable that the shape of adjustment optics trimmer makes that the words of total reflection do not take place the caustic surface at the optics trimmer, and also comprising the occasion that total reflection takes place at auxiliary surface or tabular surface can adjust.
Also have, in above-mentioned explanation, for angle [alpha] 1, α 2, β 1, β 2Deng combination, the combination of for example clear predetermined angular, but the present invention is not limited thereto.As long as satisfy above-mentioned condition,, also can be applied to the present invention for having the optics trimmer of combination at any angle.Also have, needn't set α 2And β 2Make that 2 angle γ among Fig. 2 are identical.
In addition, in above-mentioned explanation, the base material of optics trimmer and wire optical structure are all by refractive index n 1Optical material form, but the present invention is not limited thereto.The refractive index n of the base material of optics trimmer bRefractive index n with the wire optical structure 1Difference also can.The optics trimmer 1B of second embodiment shown in Fig. 8 (a) has by refractive index n 1The optical material base material 10 and wire optical structure 34 that form.With respect to this, the optics trimmer 1C shown in Fig. 8 (b) has by refractive index n 1The wire optical structure 34 that forms of optical material and by refractive index n b(n b≠ n 1) the base material 110 that forms of optical material.
As above explanation is such, in Fig. 8 (a), with incident angle I 1The light 51 that incides base material 10 and interface air (bottom surface 10a) is at the interfacial refraction of base material 10 with air.At this refraction angle I 2Formula 10 by shown in following is represented (Snell law).
(formula 10)
sinI 2＝(sinI 1)/n 1
At this, base material 10 forms with the optical material of linear structure body 34 with identical refractive index n 1.The light 52 of therefore, advancing in the inside of base material 10 is in interface (divide the face of the base 31b that the form first wire prism portion 31) straightaway of base material 10 with the first wire prism portion 31 of linear structure body 34.
With respect to this, in Fig. 8 (b), base material 110 with the interface (bottom surface 110a) of air with the light 51 of incident angle I1 incident interfacial refraction at base material 110 and air.Refraction angle Ib at this is represented by the formula 11 shown in following.
(formula 11)
sinI b＝(sinI 1)/n b
In addition, base material 110 (refractive index ns b) and linear structure body 34 (refractive index ns 1) form by the different optical material of refractive index respectively.Therefore, reflect at the interface of the first wire prism portion 31 of base material 110 and linear structure body 34 (dividing the face of the base 31b that forms the first wire prism portion 31) at the light 52A of base material 110 with the interfacial refraction of air.At this, base material 110 that kind shown in Fig. 8 (b), parallel occasion, refraction angle I at the interface of the base material 110 and the first wire prism portion 31 in top and bottom 2' represent by the formula 12 shown in following.
(formula 12)
sinI 2’＝(n b/n 1)sinI b
Bring formula 11 into formula 12, obtain sinI 2'=(sinI 1)/n 1This is identical with formula 10.That is I, 2' with to be directly incident on refractive index from air be n 1Medium the time refraction angle I 2Equate.Therefore, as optics trimmer 1C, in the refractive index different occasions of base material and thread like body, the refractive index that makes the linear structure body is n 1, be I at the refraction angle at the interface of base material and linear structure body 2, the formula in the above-mentioned explanation can intactly be used.
[the 3rd embodiment]
As the 3rd embodiment, the inventor obtains effective range for the number to the second wire prism portion of optics trimmer, and the number that changes the second wire prism portion is investigated the optical characteristics of optics trimmer.Specifically, the use nitometer carries out the mensuration of front face brightness, and estimates through the visual sensory function who carries out color.Optical adjusting member of the present invention possesses a plurality of thread like bodies with light transmission on base material; Be roughly triangle with the cross section of its bearing of trend quadrature; Divide among 3 limits that form this cross section;, the surperficial parallel contact of limit and above-mentioned base material; And a limit among other two limits is stepped, and the light that makes oblique incidence arrive this base material bottom surface sections is reflected the vertical direction to base material by one side of this step-like configuration, is produced the optical adjusting member of the auxiliary light that relaxes look separation by another limit.Can know that from following mensuration result the scope that its ladder number is suitable in this optical adjusting member is 2～9.
In the 3rd embodiment, made the optics trimmer (embodiment 3～9) that between 1～15, changes the number of the second wire prism portion, compared their optical characteristics.As shown in Figure 9, in the 3rd embodiment, with the embodiment 1 of first embodiment likewise, first, second base angle 2, β 2The second wire prism portion that is respectively 30 degree, 70 degree is located at the 11c limit of the first wire prism portion, and these second wire prism portions all are same shape.Have, the first wire prism portion all is first, second base angle again 1, β 1Be respectively the wire prism portion of the triangle of 39.14 degree, 57.71 degree, the length of the bottom side portion 11b that contacts with the base material of optics trimmer is 35 μ m.In each following embodiment,, suitably similarly change the size of the second wire prism portion according to the contact number of the second wire prism portion of configuration of the limit 11c with the first wire prism portion.
(embodiment 3)
Shown in Figure 10 (A), (B), the optical adjusting member 1B of embodiment 3 and the optical adjusting member 1 of embodiment 1 likewise dispose 3 second wire prism portions 12 on the hypotenuse 11c of the first wire prism portion 11.That is the number that, becomes the general triangular shape body of second cross-section is 3.With regard to the optical adjusting member 1B of present embodiment 3, front face brightness is more than 100%, and look separates that to suppress effect abundant, visually can not confirm the painted of emergent light.
(embodiment 4)
Shown in figure 11, the optical adjusting member 1C of embodiment 4 disposes 2 second wire prism portions 12 on the hypotenuse 11c of the first wire prism portion 11.That is, the optical adjusting member 1C of embodiment 4 has 2 general triangular shape bodies that constitute second cross-section.The front face brightness of the optical adjusting member 1C of embodiment 4 is more than 100%, and look separates that to suppress effect abundant, visually can not confirm the painted of emergent light.In embodiment 4, with after the comparative example 7 stated compare, be that auxiliary surface is arranged on more near α 1The mode of one side, result can obtain front face brightness simultaneously and separate the inhibition effect with look.(also have, this structure has also realized the result of the balance of caustic surface and auxiliary surface, is the foregoing description 2.The shape that in present embodiment 2, changes 2 second wire prism portions is adjusted.)
(embodiment 5)
Shown in figure 12, the optical adjusting member 1D of embodiment 5 disposes 6 second wire prism portions 12 on the hypotenuse 11c of the first wire prism portion 11.That is, the optical adjusting member 1D of embodiment 5 has 6 general triangular shape bodies that constitute second cross-section.With regard to the optical adjusting member 1D of embodiment 5, front face brightness is more than 100%, and look separates that to suppress effect abundant, visually can not confirm the painted of emergent light.
(embodiment 6)
The optical adjusting member of not shown embodiment 6 disposes 9 second wire prism portions on the hypotenuse of the first wire prism portion.That is, the optical adjusting member of embodiment 6 has 9 general triangular shape bodies that constitute second cross-section.With regard to the optical adjusting member of embodiment 6, front face brightness is more than 100%, and the inhibition effect that look separates is abundant, visually can not confirm the painted of emergent light.
(embodiment 7)
Shown in Figure 13 (A), (B), the optical adjusting member 1E of comparative example 3 disposes 1 second wire prism portion 12 on the hypotenuse 11c of the first wire prism portion 11.That is, the optical adjusting member of comparative example 3 has 1 the general triangular shape body that constitutes second cross-section.With regard to this optical adjusting member 1E, the inhibition effect that look separates is abundant, and the painted of emergent light can not Visual Confirmation.Also have, the painted degree of the emergent light of in comparative example 3, confirming is littler than the painted degree in the comparative example 2 of above-mentioned first embodiment.
This result considers from following reason.As stated, be positioned at the 11 base angle side (α of the first wire prism portion through making 1The caustic surface of second wire prism portion side) is wideer, can increase the utilization ratio of incident light, increases brightness.This is because the second wire prism portion of the first wire prism portion 11 forms face 11c the closer to base angle 1Side, just big more with respect to the angular aperture of substrate surface, so the intensity of the light through this face 11c is the closer to the base angle of the first wire prism portion 1Side is bigger (illumination uprises) just.Therefore, as embodiment 7, in the structure that the second wire prism portion is formed by a triangle, be positioned at α 1The light collecting part of the second wire prism portion of side is the wideest.Like this, owing to can assemble the big light of intensity, thus the excellent in efficiency of incident ray, the brightness that can increase incident light.On the other hand, tail off relatively owing to see through the light of auxiliary surface, so it is insufficient to suppress the effect of look separation, the result, the painted of emergent light left behind.In addition, tail off relatively owing to see through the light of auxiliary surface, auxiliary surface is insufficient to the dispersion effect of emergence angle, and the visual angle narrows down as a result.Therefore, in embodiment 7, the brightness of the peak value of emergent light is abundant, but its direction is not positive, and, because the visual angle is narrow,, compares with the front face brightness of the optical adjusting member of the foregoing description 3～5 and to diminish as front face brightness.
(embodiment 8)
The optical adjusting member of not shown embodiment 8 disposes 10 second wire prism portions on the hypotenuse of the first wire prism portion.That is, the optical adjusting member of embodiment 8 has 10 general triangular shape bodies that constitute second cross-section.In the optical adjusting member of embodiment 8, the inhibition effect that look separates is abundant, and the painted of emergent light can not Visual Confirmation, but front face brightness is less than 100%.
(embodiment 9)
The optical adjusting member of not shown embodiment 9 disposes 15 second wire prism portions on the hypotenuse of the first wire prism portion.That is, the optical adjusting member of embodiment 9 has becomes 15 of second cross-section general triangular shape body.In the optical adjusting member of embodiment 9, the inhibition effect that look separates is abundant, and the painted of emergent light can not Visual Confirmation, but front face brightness is less than 100%.
In the present embodiment 8,9, near first base angle 1The area of auxiliary surface of the second wire prism portion that is provided with of a side become many, otherwise the area of caustic surface tails off relatively.This result, although it is abundant to cause the look separation to suppress effect, the result that front face brightness is not enough.
Table 2 has been summed up above evaluation result.Also have, front face brightness is that the front face brightness with the comparative example in first embodiment 1 is benchmark (100%).In addition, the benchmark of the evaluation of the color homogeneity of table 2 is identical with table 1.
(table 2)
Figure S200810109804XD00301
Can know from above result, the number of the second wire prism portion, that is, the number of a plurality of general triangular shape bodies that constitutes second cross-section can satisfy front face brightness simultaneously and separate inhibition with look in the scope below 9 more than 2.In other words, the number of the ladder among the cascaded surface 13b of wire optical structure 13 better is below 9 rank more than 2 rank.
In above experiment, to base angle 1, β 1, α 2, β 2Size etc., for example clear specific combined.Yet, be the scope of 45～85 degree in the incident angle of brightness peak light, in satisfying the optical adjusting member of following formula, carried out a plurality of experiments, the result obtains same result.In following formula, the refractive index n of air 0Be 1.0, the unit of angle is degree.
(formula 1)
n 0sinI 1＝n 1sinI 2n 0＝1.0
0≤sin(α 1+α 2-I 2)≤1/n 1
I 2≤α 1+α 2≤I 2+90
-I 2≤β 2-α 1≤90-I 2
In this occasion, can make the highest brightness peak light of brightness total reflection not take place and reflect at caustic surface, can obtain brightness peak light effectively from the optics trimmer.
In addition, I 2maxDuring for the critical angle of total reflection, i.e. sinI 2max=1/n 1The time, in satisfying the optical adjusting member of following formula, carry out the result of test of many times, can obtain same result.
(formula 2)
α 1+α 2≤2·I 2max
In this occasion, incident ray is when having the angle that makes brightness peak light and be the angle distribution of peak value, and the incident ray that can make incident angle arbitrarily takes out from the optics trimmer in not total reflection of caustic surface effectively.
Like this, in having the optics trimmer of the combination of satisfying above-mentioned angle condition, can suppress look reliably and separate, improve light characteristic, and be suppressed at the total reflection of the caustic surface of incident ray, obtain light effectively from the optics trimmer.Also have, optics trimmer of the present invention is not to satisfy above-mentioned angle condition, can both use the present invention to the optics trimmer of arbitrarily angled combination.
Also have, the optics trimmer to first, second wire prism portion of comprising prescribed level in the 3rd embodiment is illustrated.For example, in the foregoing description 3～6, the length of the bottom side portion 11b that the base material with the optics trimmer of the first wire prism contacts is 35 μ m, but the present invention is not limited thereto.For example, the length of bottom side portion 11b is 7 μ m～100 μ m, and the number of a plurality of general triangular shape bodies that forms second cross-section can satisfy front face brightness simultaneously and separate the requirement that suppresses with look in the scope below 9 more than 2.
The possibility of utilizing on the industry
Optical adjusting member of the present invention can suppress the look separation of emergent light with an optical adjusting member, and can improve the utilization ratio of incident light.Therefore, optical adjusting member of the present invention is particularly suitable for the optics as the function of the light directive property of lighting device with control edge light mode and liquid crystal indicator.
In addition, in liquid crystal indicator of the present invention and lighting device, owing to possess optical adjusting member of the present invention, slimming, cost degradation that can implement device can improve optical characteristics simultaneously.Therefore, liquid crystal indicator of the present invention and lighting device are suitable for the liquid crystal indicator and the lighting device of various uses.

Claims (15)

1. an optical adjusting member is characterized in that,
Possess: have the base material of light transmission and be arranged on a plurality of thread like bodies on the said base material with light transmission,
Has second cross-section of first cross-section and the area of dividing the triangle that forms by first～the 3rd limit and general triangular shape that by four～the hexagon division form littler with the cross section of the bearing of trend quadrature of said thread like body than first cross-section; First limit of first cross-section contacts with the surface of said base material abreast; Second cross-section is arranged on second limit of first cross-section; And the 4th limit of second cross-section contacts with second limit of first cross-section abreast
The 5th limit and the hexagon of second cross-section tilt with respect to the 4th limit; Make in the light characteristic of the light that incides said optical adjusting member brightness for the brightness peak light of advancing on the maximum direction during by said optical adjusting member refraction, the direct of travel of the brightness peak light of the direct of travel of the direct of travel of the brightness peak light after the face refraction of the said thread like body on the 5th limit of involved second cross-section and this brightness peak light after the face refraction of the said thread like body of the hexagon that comprises second cross-section before with respect to refraction is reciprocal.
2. optical adjusting member according to claim 1 is characterized in that,
On second limit of first cross-section, be provided with a plurality of second cross-section.
3. optical adjusting member according to claim 2 is characterized in that,
Said a plurality of second cross-section all is of similar shape and size.
4. optical adjusting member according to claim 2 is characterized in that,
The shape of said a plurality of second cross-section is similar figures each other.
5. optical adjusting member according to claim 2 is characterized in that,
The drift angle relative with the 4th limit of said a plurality of second cross-section is identical angle.
6. optical adjusting member according to claim 1 is characterized in that,
Shorter than another limit among the 5th and the hexagon of second cross-section near the limit of the drift angle relative with first limit of first cross-section.
7. optical adjusting member according to claim 1 is characterized in that,
The 3rd limit of first cross-section is maximum direction almost parallel with respect to the vergence direction on first limit and brightness in the light characteristic of the light that incides said optical adjusting member.
8. optical adjusting member according to claim 1 is characterized in that,
Said a plurality of thread like body periodically disposes in the direction with its bearing of trend quadrature.
9. optical adjusting member according to claim 1 is characterized in that,
Refractive index at said thread like body is n 1, surround the refractive index n of the air of said base material and said thread like body 0Be 1.0, the direction angulation of the normal direction at the interface of said air and said base material and said airborne light is I 1, the direction angulation of the light in said normal direction and the said thread like body inside is I 2, first limit and second limit, the 4th limit and the 5th limit and the 4th limit and hexagon angulation are respectively α 1, α 2And β 2The time, satisfy
n 0sinI 1＝n 1sinI 2
0≤sin(α 1+α 2-I 2)≤1/n 1
I 2≤α 1+α 2≤I 2+90
-I 2≤β 2-α 1≤90-I 2。
10. optical adjusting member according to claim 1 is characterized in that,
Refractive index at said thread like body is n 1, the critical angle in the total reflection at the interface of air that surrounds said base material and said thread like body and said thread like body of light is I 2max, satisfy sinI 2max=1/n 1, first limit and second limit and the 4th limit and the 5th limit angulation are respectively α 1And α 2The time, satisfy
α 1+α 2≤2·I 2max。
11. according to claim 9 or 10 any one described optical adjusting member, it is characterized in that,
The refractive index of said base material and the refractive index n of said thread like body 1Identical.
12. according to claim 9 or 10 any one described optical adjusting member, it is characterized in that,
Said base material has the refractive index different with the refractive index of said thread like body, and forms the parallel flat shape.
13. optical adjusting member according to claim 1 is characterized in that,
Possess: have the base material of light transmission and be arranged on a plurality of thread like bodies on the said base material with light transmission,
With the cross section of the bearing of trend quadrature of said thread like body have the area dividing first cross-section of the triangle that forms and comprise a plurality of triangle bodies and each triangle body by first～the 3rd limit than the area of first cross-section littler and second cross-section that form by the division of the four～the hexagon
First limit of first cross-section contacts with the surface of said base material abreast,
Said a plurality of triangle body seamlessly is configured on second limit of first cross-section, and the 4th limit of said each triangle body contacts with second limit of first cross-section abreast,
The number of said triangle body is more than 2 below 9.
14. a lighting device possesses light source, optical adjusting member and is used for it is characterized in that from the photoconduction of the said light source outgoing LGP to said optical adjusting member,
Said optical adjusting member possesses: has the base material of light transmission and is arranged on a plurality of thread like bodies on the said base material with light transmission,
Has second cross-section of first cross-section and the area of dividing the triangle that forms by first～the 3rd limit and general triangular shape that by four～the hexagon division form littler with the cross section of the bearing of trend quadrature of said thread like body than first cross-section; First limit of first cross-section contacts with the surface of said base material abreast; Second cross-section is arranged on second limit of first cross-section; And the 4th limit of second cross-section contacts with second limit of first cross-section abreast
The 5th limit and the hexagon of second cross-section tilt with respect to the 4th limit; Make in the light characteristic of the light that incides said optical adjusting member brightness for the brightness peak light of advancing on the maximum direction during by said optical adjusting member refraction, the direct of travel of the brightness peak light of the direct of travel of the direct of travel of the brightness peak light after the face refraction of the said thread like body on the 5th limit of involved second cross-section and this brightness peak light after the face refraction of the said thread like body of the hexagon that comprises second cross-section before with respect to refraction is reciprocal.
15. liquid crystal indicator; Have light source, optical adjusting member, be used for from the photoconduction of light source outgoing to the LGP of said optical adjusting member and be configured in said optical adjusting member and the liquid crystal display cells opposite side of said LGP side; It is characterized in that
Said optical adjusting member possesses: has the base material of light transmission and is arranged on a plurality of thread like bodies on the said base material with light transmission,
Has second cross-section of first cross-section and the area of dividing the triangle that forms by first～the 3rd limit and general triangular shape that by four～the hexagon division form littler with the cross section of the bearing of trend quadrature of said thread like body than first cross-section; First limit of first cross-section contacts with the surface of said base material abreast; Second cross-section is arranged on second limit of first cross-section; And the 4th limit of second cross-section contacts with second limit of first cross-section abreast
The 5th limit and the hexagon of second cross-section tilt with respect to the 4th limit; Make in the light characteristic of the light that incides said optical adjusting member brightness for the brightness peak light of advancing on the maximum direction during by said optical adjusting member refraction, the direct of travel of the brightness peak light of the direct of travel of the direct of travel of the brightness peak light after the face refraction of the said thread like body on the 5th limit of involved second cross-section and this brightness peak light after the face refraction of the said thread like body of the hexagon that comprises second cross-section before with respect to refraction is reciprocal.
CN200810109804XA 2007-05-31 2008-05-30 Optical adjusting member and illumination device and liquid crystal display device including the same Active CN101315433B (en)

Applications Claiming Priority (9)

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JP2007145847A JP2008299131A (en) 2007-05-31 2007-05-31 Liquid crystal display
JP2007-145847 2007-05-31
JP2007145847 2007-05-31
JP2007305718 2007-11-27
JP2007-305718 2007-11-27
JP2007305718A JP2009128764A (en) 2007-11-27 2007-11-27 Optical adjusting member and illumination device and liquid crystal display device including the same
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JP5055398B2 (en) 2010-03-12 2012-10-24 株式会社ジャパンディスプレイイースト Illumination device and liquid crystal display device
JP5789134B2 (en) * 2011-06-16 2015-10-07 株式会社ジャパンディスプレイ LIGHTING DEVICE, DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE
CN108600665B (en) * 2018-01-23 2024-01-12 江苏凡润电子有限公司 Loading shell of liquid crystal display

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CN1816719A (en) * 2003-07-15 2006-08-09 三菱丽阳株式会社 Light source device and light deflection element

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