CN203069816U

CN203069816U - Optical waveguide plate, surface light source apparatus and transmission type image display apparatus

Info

Publication number: CN203069816U
Application number: CN2012205602600U
Authority: CN
Inventors: 百田健太郎; 关口泰广; 岛田芳永
Original assignee: Seiren Co Ltd; Sumitomo Chemical Co Ltd
Current assignee: Seiren Co Ltd; Sumitomo Chemical Co Ltd
Priority date: 2011-10-28
Filing date: 2012-10-29
Publication date: 2013-07-17
Anticipated expiration: 2022-10-29
Also published as: CN103091764B; CN103091764A; TWI572911B; KR20130047655A; TW201326929A; KR101269770B1; JP5503621B2; JP2013097927A

Abstract

A light guide plate, a surface light source device, and a transmissive image display device capable of reducing gray scale unevenness generated near a light incident portion of incident light. The light guide plate includes a light guide plate base material (11) for transmitting light, and has a plurality of light reflection points (12) formed on at least one surface of the light guide plate base material. In a plurality of virtual regions (A) formed by virtually dividing the surface forming the light reflection point (S2) into multiple virtual areas (A) at equal intervals, a plurality of virtual grids (g) are regularly arranged two-dimensionally , a light reflection point is formed in a prescribed virtual grid among the plurality of virtual grids, according to the configuration of the light reflection point in one of the plurality of virtual regions and at least one virtual region of the remaining plurality of virtual regions The arrangement of the light reflection points within constitutes a translationally symmetrical light distribution pattern, and a plurality of light reflection points are formed on the point forming surface.

Description

Light guide plate, planar light source device and permeation type visual display unit

Technical field

The utility model relates to light guide plate, planar light source device and permeation type visual display unit.

Background technology

Permeation type visual display units such as liquid crystal indicator have the light guide plate utilized usually and supply with the planar light source device of planar light and be used as backlight.The mode of planar light source device has the rear side in light guide plate that the straight-down negative of light source is set and the edge light mode of light source is set along the side of light guide plate.The edge light mode is more favourable from the viewpoint of the slimming of image display device.

In the planar light source device of edge light mode, from the light of the side incident of light guide plate since be arranged on light guide plate rear side light distribution patterns (for example, the light distribution patterns that is constituted by the light reflection spot) effect, be reflected and diffusion (scattering), the light of the angle composition that critical angle is above is from the exit facet outgoing of light guide plate, thereby supplies with planar light.For making the uniform gray level of this light-emitting area, at patent documentation 1: TOHKEMY 2004-240294 communique and patent documentation 2: on the light guide plate that TOHKEMY 2008-27609 communique is put down in writing, be applied in along with the density that makes light distribution patterns away from light source from dredging to close grating.

In addition, the method for utilizing drop ejection (for example, ink jet printing) to form the light distribution patterns of this point-like is also disclosed in the patent documentation 1.For example, in ink jet printing method, in order to shorten printing intermittently, arrange a plurality of inkjet heads sometimes, come printing ink.

Herein, under the situation of the further slimming of image display device, the reflection of light number of times in the light guide plate increases, and therefore need will be printed as lower lining rate near the light source, for example more than 0.1% below 30%.

In addition, in order to reduce cost, when LED is arranged and/or when making it only from an edge direction incident light etc. along short side direction, light path can be elongated, therefore with slimming similarly, need will be printed as lower lining rate near the light source.

But, print under the situation of light reflection spot near the mode that becomes lower lining rate the light in part that makes incident from the light of light source, because the light reflection spot is little, so the light and shade difference of printing zone and non-printing zone is big, near light in part, can produce the such gray scale inequality of mist and clouds.

The utility model content

So the purpose of this utility model is to provide a kind of light guide plate, planar light source device, permeation type visual display unit, the light guide plate that can be reduced near the gray scale inequality that produces the light in part of incident light method for designing and manufacturing method of light conducting board of light distribution patterns.

Light guide plate of the present utility model, comprise the light guide plate base material that transmits light, this light guide plate possesses a plurality of smooth reflection spot at least one side's who is formed at described light guide plate base material surface, namely put formation face uniformly-spaced on the surface that will form a plurality of described smooth reflection spots, be divided into virtually in each virtual region of a plurality of and a plurality of virtual regions of obtaining, two-dimensional arrangements has a plurality of dummy grid as the printing target regularly, in the dummy grid of the regulation of a plurality of described dummy grid of two-dimensional arrangements, be formed with described smooth reflection spot, be formed with a plurality of described smooth reflection spots according to following light distribution patterns at described some formation face, namely, this light distribution patterns is the light distribution patterns that the configuration of the configuration of the described smooth reflection spot in the described virtual region of selecting from a plurality of described virtual regions and the described smooth reflection spot at least one the described virtual region in remaining a plurality of described virtual region constitutes the translation symmetry.

Under this situation, the above-mentioned light distribution patterns that is constituted by a plurality of smooth reflection spots have with a plurality of virtual regions in remaining at least one virtual region in the configuration of light reflection spot constitute this regularity of translation symmetry.Therefore, forming under the situation of light reflection spot with lower lining rate near the light source, the printing zone (having formed the zone of light reflection spot) that also can reduce the light reflection spot is poor with the light and shade of non-printing zone (not forming the zone of light reflection spot).As a result, can be suppressed in the light guide plate near the gray scale inequality the light in part of incident light.

In one embodiment, the configuration of the described smooth reflection spot in the described virtual region more than 6 in the configuration that can make the described smooth reflection spot in the described described virtual region of selecting and 24 the described virtual regions that surround a described described virtual region of selecting constitutes the translation symmetry.

Under this situation, the regularity in the above-mentioned light distribution patterns that is made of a plurality of smooth reflection spots improves, and therefore can suppress near the gray scale inequality the light in part.

In one embodiment, the configuration formation translation symmetry of the described smooth reflection spot in the described virtual region more than 4 in the configuration that can make the described smooth reflection spot in the described described virtual region of selecting and 8 described virtual regions adjacent with a described described virtual region of selecting.

Under this situation, regular in the above-mentioned light distribution patterns that is made of a plurality of smooth reflection spots further improves, and therefore can further reduce near the gray scale inequality the light in part.

In each virtual region in a plurality of described virtual region in one embodiment, maximum gauge in the diameter of a plurality of described smooth reflection spots in will being formed at described virtual region is expressed as D μ m, it is L1 with the quantitaes of the described dummy grid of the 1st orientation in the described two-dimensional arrangements, and will with described two-dimensional arrangements in the quantitaes of described dummy grid of the 2nd orientation that intersects of described the 1st orientation when being L2

10μm＜D≤300μm，

2＜L1≤200 and 2＜L2≤200.

In each virtual region of a plurality of virtual regions in one embodiment, virtual region can be divided into a plurality of zonules.Under this situation, the zonule can be following zone, namely,

When the number with the light reflection spot in the virtual region is expressed as n, and n＞1,

Be L1 with the quantitaes of the dummy grid of the 1st orientation in the two-dimensional arrangements,

Will with two-dimensional arrangements in the quantitaes of dummy grid of the 2nd orientation that intersects of described the 1st orientation be L2,

The set that will be made of the common divisor of L1 and L2 is expressed as N1, N2 respectively,

The key element that constitutes N1 and N2 is expressed as N1e, N2e respectively,

X is defined as N1e * N2e-n,

Y is defined as N1e+N2e,

Under X was condition more than 0, the N1e, the N2e that make described X and described Y become minimum value were expressed as N1e _Min, N2e _Min,

Be M1 with the quantitaes of the dummy grid of the 1st orientation of zonule,

When the quantitaes of the dummy grid of the 2nd orientation of zonule is M2,

M1 is L1/N1e _Min,

M2 is L2/N2e _MinIn this mode, in each virtual region of a plurality of virtual regions, the ratio that does not form the zonule of light reflection spot also can be below 75%.

In each of a plurality of virtual regions, when the ratio of the zonule that does not form the light reflection spot 75% when following, can easily in virtual region, dispose the light reflection spot equably.As a result, near the gray scale inequality the light in part can more be lowered.

In one embodiment, a plurality of smooth reflection spot that is formed on the formation face can comprise the light reflection spot more than 2 kinds that varies in size.

Other aspect of the present utility model relates to and a kind ofly possesses light guide plate of the present utility model and to the edge light profile light supply apparatus of the side light source supplying light of light guide plate.

This planar light source device possesses light guide plate of the present utility model, therefore can reduce near the gray scale inequality of light in part.Even near the lining rate of the light reflection spot the light in part is low lining rate, the light and shade that also can reduce the printing zone of light reflection spot and non-printing zone is poor.As a result, can the more uniform light of outgoing gray scale.

Other aspects of the utility model relate to a kind of permeation type visual display unit of the infiltration type image displaying part that possesses above-mentioned planar light source device of the present utility model and dispose opposed to each other with the exit facet of planar light source device.

This permeation type visual display unit possesses planar light source device of the present utility model, so the infiltration type image displaying part can be illuminated equably.

According to the utility model, can provide near light guide plate, planar light source device and the permeation type visual display unit of the gray scale inequality that produces the light in part that can reduce incident light.

Description of drawings

Fig. 1 is the cut-open view of permeation type visual display unit that expression possesses an embodiment of light guide plate of the present utility model.

Fig. 2 is the vertical view when observing light guide plate from rear side.

Fig. 3 is a part of enlarged drawing at the back side of light guide plate.

Fig. 4 is the synoptic diagram of virtual region.

Fig. 5 is the process flow diagram of an embodiment of expression manufacturing method of light conducting board of the present utility model.

Fig. 6 is that expression comprises the synoptic diagram for the manufacturing installation of the light guide plate 1 of the printing equipment of the printing of light reflection spot.

Fig. 7 is the accompanying drawing of observing inkjet head from the ejection side of drop.

Fig. 8 (a) is the accompanying drawing of the configuration of the interior light reflection spot of the virtual region among the expression embodiment 2.(b) be the accompanying drawing of the configuration of the light reflection spot in the virtual region of representing among the embodiment 3.(c) be the accompanying drawing of the configuration of the light reflection spot in the virtual region of representing among the embodiment 4.(d) be the accompanying drawing of the configuration of the light reflection spot in the virtual region of representing among the embodiment 5.

Fig. 9 (a) is the accompanying drawing of the configuration of the interior light reflection spot of the virtual region among the expression embodiment 6.(b) be the accompanying drawing of the configuration of the light reflection spot in the virtual region of representing among the embodiment 7.

Figure 10 (a) is the accompanying drawing of the configuration of the interior light reflection spot of the virtual region among the expression embodiment 8.(b) be the accompanying drawing of the configuration of the light reflection spot in the virtual region of representing among the embodiment 9.

Figure 11 is the accompanying drawing of the light distribution patterns of a plurality of smooth reflection spots among the expression embodiment 10.

Figure 12 (a)～(e) is the accompanying drawing of the configuration example of the interior light reflection spot of the virtual region among the expression embodiment 11.

Figure 13 is the accompanying drawing of an example of the configuration of each virtual region shown in Figure 12 in the light distribution patterns of expression embodiment 11.

Figure 14 is the chart of the evaluation result of expression embodiment 1～5 and comparative example 1.

Figure 15 is expression embodiment 6,7 and the chart of the evaluation result of comparative example 2.

Figure 16 is

expression embodiment

8,9 and the chart of the evaluation result of comparative example 3.

Figure 17 is the chart of expression embodiment 10,11 evaluation result.

Embodiment

Below, with reference to description of drawings embodiment of the present utility model.To the same Reference numeral of same element annotation.Omitted the explanation that repeats.The dimension scale of the accompanying drawing not necessarily dimension scale with explanation is consistent.In the explanation, expression " on ", the word of direction such as D score is based on the word that makes things convenient for of state shown in the drawings.

Fig. 1 is the cut-open view of permeation type visual display unit that expression possesses an embodiment of light guide plate of the present utility model.Permeation type visual display unit 100 shown in Figure 1 mainly comprises planar light source device 20 and infiltration type image displaying part 30.Planar light source device 20 is to possess the light guide plate 1 with light guide plate base material 11 and be arranged on the side of light guide plate 1 and to the edge light profile light supply apparatus of light guide plate 1 light source supplying light 3.

Light guide plate base material 11 is roughly rectangular shape.Light guide plate base material 11 has the back side S2 of opposition side of exit facet S1, exit facet S1 and 4 side S3 that intersect with exit facet S1 and back side S2 ₁～S3 ₄(with reference to Fig. 2).In the present embodiment, 4 side S3 ₁～S3 ₄With exit facet S1 and back side S2 quadrature roughly.The plan view shape of light guide plate base material 11 is not limited to rectangle, also can be square.

Light guide plate base material 11 is made of translucent material.The material of light guide plate base material 11 is preferably polymethylacrylic acid alkyd resin sheet material, polystyrene sheet material or polycarbonate-based resin sheet, wherein, and preferred plexiglass sheet material (PMMA resin sheet).Light guide plate base material 11 also can comprise the diffusion particle.The surface (back side S2) of the formation light reflection spot 12 of light guide plate base material 11 and the surface (exit facet S1) of opposition side can be tabular surface as present embodiment, also can have concaveconvex shape.In addition, the thickness of light guide plate base material 11 is preferably below the above 4.5mm of 1.0mm.

The back side of light guide plate base material 11 (some formation face) S2 also can be the face that the almost whole face of back side S2 has been applied the lyophoby processing.It is that contact angle when instigating water droplet to drip to back side S2 is that the such lyophoby of 80 degree～130 degree is handled that the lyophoby that back side S2 is applied is handled, and preferred contact angle is 85 degree～120 degree, and more preferably contact angle is 90 degree～110 degree.In the present embodiment, contact angle is static contact angle.

Be formed with a plurality of smooth reflection spots 12 in the back side of this light guide plate base material 11 S2 side.That is, light guide plate 1 also has a plurality of smooth reflection spot 12 that is arranged on back side S2 side.The maximum ga(u)ge of each light reflection spot 12 is preferably below 20 μ m, more preferably below 15 μ m.

As shown in Figure 2, a plurality of smooth reflection spots 12 dispose on the S2 overleaf with being separated from each other.The spacing P(of 2 adjacent light reflection spots 12 for example, the top of light reflection spot 12 and the distance between the top) bigger than the diameter of light reflection spot 12.The example of the spacing of 2 adjacent light reflection spots 12 be 10 μ m above, below the 1000 μ m, be preferably 25 μ m above, below the 500 μ m, more preferably 50 μ m above, below the 100 μ m.Fig. 2 is the vertical view when observing light guide plate from rear side.In Fig. 2, for convenience of description, shown light source 3 in the lump.As shown in Figure 2, for making uniform planar light effectively from exit facet S1 outgoing, light reflection spot 12 is little in the light in part side near light source 3, along with become big away from light source 3.Light reflection spot 12 is formed on and spreads all over whole back side S and regularly in the dummy grid of two-dimensional arrangements, so the lining rate of light reflection spot 12 is low in the light in part side near light source 3, along with uprising away from light source 3.Preferred light reflection spot 12 does not link each other.For the convenience that illustrates, size, number of light reflection spot 12 etc. have been changed among Fig. 2.As described later, the number of light reflection spot 12 and light distribution patterns be adjusted to uniform planar light can be effectively from the mode of exit facet S1 outgoing.Herein, the light distribution patterns of light reflection spot 12 is corresponding with the configuration pattern of a plurality of smooth reflection spots 12.

Light source 3 is disposed at opposed a pair of side S3 mutually ₁, S3 ₂The side.Light source 3 can be cold-cathode fluorescence lamp linear light sources such as (CCFL), but point source of light such as LED preferably.Under this situation, as shown in Figure 2, mutual opposed 2 limits in 4 limits of the back side S2 that for example constitutes rectangle that constitutes light guide plate base material 11 are arranged with a plurality of point source of lights.When the light reflection spot 12 that will be formed by ink-jet ink described later and LED make up, to obtaining the light advantageous particularly of nature tone.

As shown in Figure 1, infiltration type image displaying part 30 is in exit facet S1 side and light guide plate 1 arranged opposite of light guide plate 1.Infiltration type image displaying part 30 is by the planar optical illumination from exit facet S1 outgoing, thus the demonstration image.The example of infiltration type image displaying part 30 is the liquid crystal display parts (perhaps liquid crystal panel) that disposed the straight line polarization plates on the two sides of liquid crystal cell respectively.

In the above-described configuration, from the light of light source 3 output S3 from the side ₁, S3 ₂Be incident to light guide plate base material 11.Diffuse reflection takes place at light reflection spot 12 in the light that is incident to light guide plate base material 11, thereby mainly from exit facet S1 outgoing.Be supplied to infiltration type image displaying part 30 from the light of exit facet S1 outgoing.For making uniform planar light effectively from exit facet S1 outgoing, number and the light distribution patterns of light reflection spot 12 are adjusted.

Then, the light distribution patterns that is made of a plurality of smooth reflection spots 12 is described.Fig. 3 is the accompanying drawing for the explanation light distribution patterns.Fig. 3 is the figure that has amplified the part of back side S2.In Fig. 3, in order to conclusively show light reflection spot 12, for the purpose of making things convenient for, represent light reflection spot 12 with bullet.

As shown in Figure 3, back side S2 is uniformly-spaced to be divided into virtual a plurality of virtual region A.In the present embodiment, as shown in Figure 3, along the 1st mutually orthogonal direction (the 1st orientation) x and the 2nd direction (the 2nd orientation) y uniformly-spaced cutting apart back side S2, thereby back side S2 is divided into a plurality of virtual region A.Fig. 3 is the figure that has extracted 3 * 3 virtual region A among a plurality of virtual region A of cutting apart behind the S2 of the back side.In Fig. 3, the zone of distinguishing with heavy line is virtual region A.Similarly, in other accompanying drawing, the zone of distinguishing with heavy line also is virtual region A.

The shape of a plurality of virtual region A is identical.Present embodiment describes with square for the shape of virtual region A.Certainly, the shape of virtual region A also can be rectangle, also can be parallelogram, rhombus.

Fig. 4 is the accompanying drawing for the explanation virtual region.Fig. 4 is one the figure that has extracted among the virtual region A among Fig. 3.In each virtual region A, as a plurality of dummy grid g(with dashed lines area surrounded of printing target) regularly by two-dimensional arrangements.Be formed with light reflection spot 12 among the dummy grid g of the regulation among a plurality of dummy grid g of two-dimensional arrangements.Fig. 3 illustration dummy grid g arrange along the 1st direction x with the 2nd direction y of the 1st direction x quadrature respectively, thereby a plurality of dummy grid g constitutes the situation of two-dimensional arrangements.Example such as Fig. 3 of the shape of dummy grid g and be square as shown in Figure 4 but also can be rectangle, also can be parallelogram, rhombus.Be not limited only to the situation of the 1st direction x and the 2nd direction y quadrature, the 1st direction x and the 2nd direction y intersection get final product.

A plurality of smooth reflection spots 12 are configured in back side S2 to satisfy following condition 1 such light distribution patterns.

(condition 1)

The configuration of the light reflection spot 12 at least one the virtual region A the configuration of the light reflection spot 12 in the virtual region A that a plurality of virtual region A select and remaining a plurality of virtual region A constitutes the translation symmetry.

Preferably, a plurality of smooth reflection spots 12 are disposed at back side S2 to satisfy following condition 2 such light distribution patterns.

(condition 2)

The configuration of the reflection spot 12 in the virtual region A more than 6 24 virtual region A around the configuration of the light reflection spot 12 in the virtual region A that a plurality of virtual region A select and this virtual region A constitutes the translation symmetry.24 virtual region A around the virtual region A are 24 virtual region A that surround a virtual region A with the width of 2 virtual region A.

More preferably, a plurality of smooth reflection spots 12 are disposed at back side S2 to satisfy following condition 3 such light distribution patterns.

(condition 3)

The configuration of the light reflection spot 12 in the virtual region A that a plurality of virtual region A select with constitute the translation symmetry adjacent to the configuration of the light reflection spot 12 in the virtual region A more than 48 virtual region A of this virtual region A.

The meaning of above-mentioned " translation symmetry " refers to, will pay close attention to the virtual region A of (perhaps selecting) under the situation of the 1st direction x or the parallel movement of the 2nd direction y, this symmetry overlapping with other virtual region A.In the following description, the number with respect to the virtual region A of the virtual region A translation symmetry of paying close attention to is also referred to as the translation symmetry number.If define the translation symmetry number like this, then condition 2 is equivalent to: in 25 virtual region A that arrange with 5 * 5 mode 2 dimensions, with the virtual region A of central authorities as the virtual region A that pays close attention to, in 25 virtual region A that 2 dimensions are arranged, be more than 6 with respect to the translation symmetry number of the virtual region A that pays close attention to.Similarly, condition 3 is equivalent to: in 9 virtual region A that arrange with 3 * 3 mode 2 dimensions, as the virtual region A that pays close attention to, the translation symmetry numbers of the virtual region A of the concern among 9 virtual region A that arrange with respect to 2 dimensions are more than 4 with the virtual region A of central authorities.

In Fig. 3, a plurality of smooth reflection spots 12 are configured to: the configuration of the light reflection spot 12 in the virtual region A and the configuration of the light reflection spot 12 in other all virtual region A constitute the translation symmetry.As a result, satisfy above-mentioned condition 3.Therefore, mode shown in Figure 3 also satisfies

condition

1,2.

An example of the relation of the size of the size of virtual region A and light reflection spot 12 is as follows.

Namely, in one embodiment, maximum gauge in the diameter of a plurality of smooth reflection spot 12 in being formed at virtual region A is expressed as D(μ m), the quantitaes of the dummy grid g of the 1st direction x in the two-dimensional arrangements is L1(), the quantitaes of the dummy grid g of the 2nd direction y in the two-dimensional arrangements is L2() time, the size of the size of light reflection spot 12 and virtual region A satisfies following 3 formulas (1a), (1b), (1c).

[several 1]

10μm＜D≤300μm…(1a)

2＜L1≤200…(1b)

2＜L2≤200…(1c)

Wherein, above-mentioned D is preferably below the above 200 μ m of 20 μ m, more preferably below the above 100 μ m of 30 μ m.

In one embodiment, virtual region A is being divided under the situation of a plurality of zonule B, the ratio that does not form light reflection spot 12 among the B of zonule can be set at below 75%.Herein, zonule B is the key element zone that constitutes virtual region A.Zonule B is the zone of setting as follows.

The number of the light reflection spot 12 in virtual region A is expressed as n (n＞1), the quantitaes of the dummy grid g of the 1st direction x is L1(), the quantitaes of the dummy grid g of the 2nd direction y is L2(), the set that is made of the common divisor of L1 and L2 is expressed as N1, N2 respectively, when the key element of formation N1 and N2 is expressed as N1e, N2e, X is defined as N1e * N2e-n, and Y is defined as N1e+N2e.And under X was condition more than 0, the N1e, the N2e that make X and Y become minimum value were expressed as N1e _Min, N2e _Min, the quantitaes of the dummy grid g of the 1st direction x of zonule B is M1(), the quantitaes of the dummy grid g of the 2nd direction y of zonule B is M2() time, M1 is L1/N1e _Min, M2 is L2/N2e _MinTherefore, zonule B is that the quantity of the dummy grid g of the 1st direction x is M1, and the quantity of the dummy grid g of the 2nd direction y is M2 zone.

At the situation of the illustrative virtual region A of Fig. 4, specifically describe the formation of zonule B.In Fig. 4, zonule B is the zone that surrounds with fine line.In virtual region A, n=9, L1=L2=6.Therefore, N1=N2={ 1,2,3,6 }.The key element N1e of N1 is the number of selecting from 1,2,3,6.The key element N2e of N2 is the number of selecting from 1,2,3,6.In the combination of the N1e that from { 1,2,3,6 }, selects and N2e, under X is condition more than 0, make X and Y become the N1e of minimum value and the combination of N2e is N1e=N2e=3.That is N1e, _MinAnd N2e _MinBe 3.Under this situation, M1 and M2 are 2.Therefore, zonule B is that the dummy grid g of the 1st direction x and the 2nd direction y is respectively 2 zone.Among the illustrative virtual region A, in order to represent the size of zonule B, a zonule B has been applied oblique line in Fig. 4, virtual region A comprises 9 zonule B.In the illustrative virtual region A of Fig. 4, each zonule B comprises light reflection spot 12, and the ratio that does not therefore form light reflection spot 12 in the B of zonule is 0%.

An example of the method for the light guide plate of making present embodiment is described then.Fig. 5 is the process flow diagram of manufacturing method of light conducting board.As shown in Figure 5, when making light guide plate, comprising: the light distribution patterns design process S10 that designs the light distribution patterns of a plurality of smooth reflection spots that form in light guide plate; And the light reflection spot printing process S20 that forms a plurality of smooth reflection spots 12 according to the light distribution patterns that in light distribution patterns design process S10, designs at light guide plate base material 11.At first, light distribution patterns design process S10 is described.

In light guide plate 1, the some formation face that forms light reflection spot 12 to be being divided into a plurality of virtual region A uniformly-spaced, virtually, and sets lining rate (the lining rate is set operation S11) by each virtual region A.In the present embodiment, form and to look like aforementioned and be divided into a plurality of virtual region A by equally spaced cutting apart the 1st mutually orthogonal direction x and the 2nd direction y like that.In the present embodiment, some formation face is equivalent to back side S2.The quantity of virtual region A and lining rate are set according to the mode from the uniform light of exit facet S1 outgoing.

Then, by each virtual region A set as the printing target, the dummy grid g(dummy grid of two-dimensional arrangements is set operation S12 regularly).Dummy grid g is set and obtained to present embodiment by further equally spaced cutting apart virtual region A along the 1st direction x and the 2nd direction y.

Next, by each virtual region A, set the size of the light reflection spot 12 that is formed on the dummy grid g and the quantity of light reflection spot 12 (light reflection spot condition enactment operation S13) based on the lining rate.The size of light reflection spot 12 can be the diameter of light reflection spot 12 as an example.

Then, constitute the translation symmetrical manner according to the configuration of the light reflection spot 12 in the virtual region A that a plurality of virtual region A select and the configuration of the light reflection spot 12 among at least one the virtual region A among remaining the virtual region A a plurality of virtual region A, in each virtual region A, light reflection spot 12 is disposed at dummy grid g, thereby obtains light distribution patterns (light reflection spot arrangement step S14).That is, according to the mode that satisfies above-mentioned condition 1, in each virtual region A, light reflection spot 12 is disposed at dummy grid g.At this moment, preferably according to the mode that satisfies above-mentioned condition 2, configuration light reflection spot 12.More preferably according to the mode that satisfies above-mentioned condition 3, dispose light reflection spot 12.

In one embodiment, after dummy grid is set operation S12, can also possess among each the virtual region A in a plurality of virtual region A, virtual region A is divided into the virtual region segmentation process of zonule B.Zonule B is as aforementioned, and the quantity of the dummy grid g of the 1st direction x is M1, and the quantity of the dummy grid of the 2nd direction is M2 zone.Like this, at virtual region A and then be divided under the situation of zonule B, in light reflection spot arrangement step S14, also can be in virtual region A, be that mode below 75% disposes light reflection spot 12 according to the ratio of the zonule B that does not form light reflection spot 12.Wherein, the virtual region segmentation process is implemented to get final product after dummy grid is set operation S12.For example, the virtual region segmentation process can be implemented in light reflection spot arrangement step.

In one embodiment, the size of the size of light reflection spot 12 and virtual region A can be designed to satisfy formula (1a)～formula (1c).

In above-mentioned smooth reflection spot condition enactment operation S13, the size of light reflection spot 12 also can be set to more than 2 kinds (2 patterns).Under this situation, in light reflection spot arrangement step S14, the light reflection spot 12 more than 2 kinds that varies in size can dispose regularly, also can dispose brokenly.

Then, according to the light distribution patterns that obtains by light distribution patterns design process S10, at an a plurality of smooth reflection spot 12 of formation face S2 printing.Fig. 6 is that expression comprises the synoptic diagram for the manufacturing installation of the light guide plate 1 of the printing equipment of the printing of light reflection spot.

Manufacturing installation 200 comprises: the transport unit 40, ink jet head section 5, UV lamp 7, the testing fixture 9 that transmit light guide plate base material 11.Ink jet head section 5, UV lamp 7 and testing fixture 9 are pressed this arranged in order from upstream side on the moving direction U of light guide plate base material 11.Ink jet head section 5 and UV lamp 7 are corresponding to the printing equipment of light reflection spot 12.

Light guide plate base material 11 is transmitted along direction U continuously or off and on by transport unit 40.Light guide plate base material 11 also can be tailored in advance according to the size of the light guide plate that will make.Perhaps, also can form light reflection spot 12 at long light guide plate base material 11, afterwards, cut out light guide plate base material 11.Transport unit 40 in the present embodiment is travelling tables, but transport unit is not limited to travelling table.Transport unit for example also can be that floating the going up of travelling belt, roller or air transferred.

Namely put on the formation face S0 on surface at the formation light reflection spot 12 of light guide plate base material 11, utilizes the ink jet head section 5 of the portion that is supported 41 supportings, and the ink-jet ink of droplet-like is printed as the pattern of point-like by the light distribution patterns of designing among the design process S10.At this moment, the pattern printing is according on a formation face S0, and the mode that the ink-jet ink of the droplet-like of dripping is separated from each other is performed.

Ink jet head section 5 spreads all over Width (direction vertical with the direction U) integral body in the zone of the formation light reflection spot 12 on the some formation face S0 of light guide plate base material 11, has the some formation face S0(back side S2 with light guide plate base material 11) arrange 1 fixing row or the above a plurality of nozzles of 2 row opposed to each other.The nozzle of the regulation from these a plurality of nozzles side by side prints in the Width integral body of light guide plate base material 11 together by the ink of the droplet-like of ink-jetting style ejection.Preferred one side makes light guide plate base material 11 move with certain speed continuously, on one side printing ink.Perhaps, repeat in the pattern of printing ink under the state that light guide plate base material 11 is stopped and making light guide plate base material 11 move to the pattern that stops behind next printing position, the pattern that can constitute by the point by multiple row is printing ink effectively.The nozzle of the afore mentioned rules of ejection ink is controlled according to light distribution patterns.

The translational speed of light guide plate base material 11 is adjusted according to the mode of printing ink suitably.Under the situation of present embodiment, as Fig. 6 and shown in Figure 7, ink jet head section 5 comprises a plurality of inkjet heads (unit) 5a～5c that has a plurality of nozzles 51 respectively.Fig. 7 is the accompanying drawing of observing inkjet head from the ejection side of ink.Fig. 7 illustration inkjet head 5a, but

inkjet head

5b, 5c also are same.These a plurality of inkjet head 5a～5c are along arranging with the direction of the direction U quadrature that transmits light guide plate base material 11, the mode that on direction of transfer U, overlaps according to each other end via fixed part 52(with reference to Fig. 6) link.

Under the situation of present embodiment, under the state of a plurality of nozzles of having fixed ink jet head section 5, the Width integral body that can spread all over light guide plate base material 11 is printing ink together.Thus, with the Width along light guide plate base material 11 on one side movable nozzle is moved, Yi Bian the situation of printing ink is compared successively, the productivity of light guide plate 1 improves by leaps and bounds.

Especially, be under the situation of the large-scale light guide plate 1 below the above 1000mm of 200mm in the length of the minor face of making light guide plate base material 11, the effect that the productivity of the method for present embodiment improves is very remarkable.And then, according to ink-jet method, even for example maximum gauge is the following such small light reflection spots 12 of 100 μ m, also can form easily and correctly.Under the thin situation of light guide plate base material 11, exist light reflection spot 12 to see through and the possibility of being seen from exit facet S1 side, by reducing light reflection spot 12, can prevent that light reflection spot 12 from seeing through and the situation of being seen from exit facet S1 side.

The nozzle of ink jet head section 5 links via conduit 55 and providing ink unit 50.Providing ink unit 50 for example has the ink container of having taken in ink and the pump that is used for sending ink.A plurality of conduits 55 can link with single ink container, also can link respectively with a plurality of ink containers.

In order to form light reflection spot 12, the ink-jet ink that is used for ink jet printing can be to contain the ultraviolet hardening ink that pigment, optical polymerism composition, photopolymerization begin agent, also can be water-base ink, solvent borne ink etc.In addition, also can not necessarily comprise pigment in the ink-jet ink.

For pigment, in preferred calcium carbonate particle, barium sulphate particle and the TiO 2 particles at least any one.Calcium carbonate particle, barium sulphate particle and TiO 2 particles each to accumulate 50% particle diameter D50 be 50～3000nm, more preferably 100～1500nm, more preferably 300～600nm.Accumulate 50% particle diameter D50 and be in calcium carbonate particle in the scope of 50～3000nm, barium sulphate particle, TiO 2 particles by from peddle product, suitably selecting based on size-grade distribution, can obtain.Accumulate 50% particle diameter D50 and be particle diameter and the volume of measuring all particles, when having accumulated volume successively from the particle of small-particle diameter, cumulative volume is the particle diameter of the particle in moment of 50% with respect to the total volume of all particles.Contain proportional to be benchmark with the total quality of ink usually, to be the degree of 0.5～15.0 quality % in the ink of pigment.Having utilized the ink as at least a pigment of calcium carbonate particle, barium sulphate particle and TiO 2 particles is the ink that has utilized inorganics.At the storage stability of ink of inorganics of having considered such utilization, namely under the situation of inorganic pigment settleability, as ink, more preferably utilize the calcium carbonate particle of 3 kinds of proportion minimums in the particle as pigment.

The viscosity of the ink-jet ink in the time of 50 ± 10 ℃ is preferably 5.0～15.0mPas, more preferably 8.0～12.0mPas.The viscosity of ink-jet ink for example can be by aliphatic carbamate (methyl) acrylate weight average molecular weight and/or contain proportional the adjustment.When the weight average molecular weight of aliphatic carbamate (methyl) acrylate and contain proportional change when big, exist the viscosity of ink to become big tendency.

25.0 ℃ the time the surface tension of ink-jet ink be preferably 25.0～45.0mJ/m ², 25.0～37.0mJ/m more preferably ²The surface tension of ink-jet ink for example can be by cooperating interfacial agents such as silicon system and fluorine system to adjust with ink.

Ink utilization after the printing is supported the UV lamp 7 of portion's 42 supportings, is cured in zone 70.Thus, form the light reflection spot 12 that is constituted by the ink after solidifying.That is, light reflection spot 12 is printed on the formation face S0.

Afterwards, check through the testing fixture 9 that utilizes the portion that is supported 43 supportings and the operation of the state of the light reflection spot 12 that forms obtain light guide plate 1.Light guide plate 1 is cut into the size of hope as required.As present embodiment, not necessarily need to utilize the testing fixture 9 in the downstream that is arranged at ink jet head section 5 to check light guide plate 1 continuously, also can utilize the testing fixture of other preparation, check light guide plate by the mode of off-line.Perhaps, also can omit the inspection of the light guide plate of being carried out by testing fixture 1.

The a plurality of smooth reflection spot 12 that Fig. 1 and light guide plate 1 shown in Figure 2 have is configured in back side S2 by the light distribution patterns that designs among the light distribution patterns design process S10.Therefore, as utilize Fig. 3 illustrates, when back side S2 being divided into a plurality of virtual region A, 1 light distribution patterns disposes a plurality of smooth reflection spots 12 by satisfying condition.

Namely, a plurality of smooth reflection spots 12 constitute the translation symmetry according to the configuration of the light reflection spot 12 in the virtual region A that a plurality of virtual region A at random select and the configuration of the light reflection spot 12 at least one the virtual region A remaining virtual region A, and this light distribution patterns with certain rules is formed on the S2 of the back side.

Make that usually, in light guide plate 1, near the light in part of incident from the light of light source 3, the lining rate of light reflection spot 12 for example is set at about 5% than the lowland from the viewpoint of the uniform gray level of the emergent light of exit facet S1 outgoing.Therefore, as Fig. 2 illustration, common side S3 ₁, S3 ₂Near the diameter of the light reflection spot 12 on next door (light in part) is little.This is utilizing and can further swedged ink jet printing forming under the situation of light reflection spot 12, and is more obvious.

Like this, low in the lining rate, also possess as described above near the littler light source 3 of the diameter of light reflection spot 12 under the situation of certain regularity ground configuration light reflection spot 12, the difference of the printing zone that light reflection spot 12 is printed and the size of non-printing zone reduces.Therefore, the light and shade difference of above-mentioned printing zone and non-printing zone diminishes, and the result can be suppressed near the uneven problem of gray scales such as mist and clouds the light light in part of light incident of light source 3.

The pattern that has disposed a plurality of smooth reflection spots 12 be light distribution patterns satisfy condition 2 and the situation of condition 3 under, the regularity in the light distribution patterns increases.Therefore, the light and shade difference of printing zone and non-printing zone further reduces.For condition 2 and condition 3, the regularity in the light distribution patterns of 3 the light distribution patterns of satisfying condition improves.As a result, compare with the situation of condition 2, utilize 3 the light distribution patterns of satisfying condition, can suppress to have formed near the gray scale inequality of light guide plate 1 light source of a plurality of smooth reflection spots 12.

Virtual region A further is being divided under the situation of a plurality of zonule B, for the mode below 75%, in virtual region A, is disposing light reflection spot 12 for the ratio of the zonule B that does not form light reflection spot 12 easily equably.As a result, in light guide plate 1, can further be reduced near the gray scale inequality of light in part of the light incident of light source 3.

In light distribution patterns design process S10, possess virtual region A is divided under the situation of operation of zonule B, as described above, the design of light distribution patterns that allows to further to reduce near a plurality of smooth reflection spot 12 of the gray scale inequality the light in part in light guide plate 1 becomes and is more prone to.

In addition, when the size of light reflection spot 12 had more than 2 kinds, the grey scale change that light reflection spot 12 is produced was little.As a result, can further suppress gray scale inequality near the zone of low lining rate such light source 3.

As described above, in light guide plate 1, near the gray scale inequality the light in part is lowered, and therefore planar light source device 20 shown in Figure 1 can the more uniform light of outgoing gray scale.Therefore, the infiltration type image displaying part 30 of permeation type visual display unit 1 can be illuminated more equably.

[embodiment]

Light guide plate 1 with embodiment of the present utility model studies as embodiment, has carried out the comparative evaluation with the light guide plate of comparative example.The light guide plate of embodiment and comparative example is as follows.

(embodiment 1)

Prepare the PMMA resin sheet of 923mm * 540mm as the translucent resin sheet material, use the uv-curing type ink jet ink that contains calcium carbonate to make light guide plate as pigment.

Particularly, the process flow diagram according to shown in Figure 5 has designed light distribution patterns.Setting among the operation S11 in the lining rate, be foursquare a plurality of virtual region A of 507 μ m Yi Bian back side S2 is divided into, and the lining rate of each virtual region A is set to 3.4%.Then, set among the operation S12 at grid, the dummy grid g that is used as the printing target of light reflection spot 12 is set at 6 * 6 by each virtual region A.In this operation, 36 dummy grid g are by two-dimensional arrangements regularly.In virtual region A, the quantity of the dummy grid g of the 1st direction x (L1) is 6, and in virtual region A, the quantity of the dummy grid g of the 2nd direction y (L2) also is 6.Then, in light reflection spot condition enactment operation S13, based on lining rate 3.4%, the diameter of light reflection spot 12 is set to 35 μ m, and by each virtual region A, the number of light reflection spot 12 is set to 9.Then, in light reflection spot arrangement step S14, be the mode of state shown in Figure 4 according to the light reflection spot 12 in each virtual region A, disposed light reflection spot 12 at virtual region A.Under this situation, by the light distribution patterns that constitutes of a plurality of smooth reflection spot 12 of design among the embodiment 1 corresponding to the light distribution patterns that is constituted by a plurality of reflection spots 12 shown in Figure 3.

In embodiment 1, in all virtual region A, light reflection spot 12 is configured as shown in Figure 4.Therefore, under the situation of paying close attention to a virtual region A, the translation symmetry number among 8 virtual region A adjacent with this virtual region A is 8.In addition, the translation symmetry number with respect to the virtual region A that pays close attention to of surrounding among 24 virtual region A of the virtual region A pay close attention to is 24.

As utilize Fig. 4 illustrates, in embodiment 1, imported under the situation of concept of the zonule B that virtual region A is further cut apart, L1=L2=6, the number of light reflection spot 12 (n) is 9, so N1e _Min=N2e _Min=3.Wherein, N1e _Min, N2e _MinAs aforementioned, be to be more than 0 under this condition at the key element N1e that constitutes the set N1, the N2 that are formed by the common divisor of L1 and L2, X(=N1e * N2e-n) among the N2e, make X and Y(=N1e+N2e) become N1e and the N2e of minimum value.Since L1=L2=6, N1e _Min=N2e _Min=3, the quantity (M1) of dummy grid g that therefore constitutes the 1st direction x of zonule B is 2, and the quantity (M2) of dummy grid g that constitutes the 2nd direction y of zonule B also is 2.Embodiment 1 has formed light reflection spot 12 in all zonule B.As a result, if the ratio that will form the zonule B of light reflection spot 12 is not set at R(%), R=0 then.Above-mentioned " ratio " is at the following ratio R that is also referred to as.

Then, peel off shielding film from the PMMA resin sheet, on the face of having peeled off shielding film, the light distribution patterns that obtains utilizes the uv-curing type ink jet ink to carry out ink jet printing.As inkjet head, used injector spacing from the inkjet head (with reference to Fig. 6) of d1 for about 84.5 μ m.Light distribution patterns is printed in the zone of the 60mm * 500mm in the face of 923mm * 540mm that the PMMA resin sheet has.

Then, to the printing after the ink-jet ink irradiation ultraviolet radiation, ink is by photocuring.Particularly, after on the PMMA resin sheet uv-curing type ink jet ink having been carried out the pattern printing, irradiation ultraviolet radiation after 6 seconds, ink is by photocuring.As a result, obtained being formed with the light guide plate of the embodiment 1 of the light distribution patterns that light reflection spot 12 disposed regularly.

(embodiment 2～5)

The configuration this point of the light reflection spot 12 in changing virtual region A, method has similarly to Example 1 obtained the light guide plate of embodiment 2～5.

Fig. 8 (a)～Fig. 8 (d) is the accompanying drawing of the configuration of the light reflection spot 12 in the virtual region A that represents respectively among the embodiment 2～5.The difference with embodiment 1 among the embodiment 2～5 utilizes the concept of zonule B to describe.In Fig. 8 (a)～Fig. 8 (d), in order to represent the size of zonule B, with the situation of Fig. 4 similarly, a zonule B has been marked oblique line.In other accompanying drawing, similarly a zonule B has been marked oblique line.

In embodiment 2, the configuration of the light reflection spot 12 in the B of zonule is changed shown in Fig. 8 (a) like that.In embodiment 2, all zonule B in the virtual region A have been disposed light reflection spot 12.Therefore, similarly to Example 1, the ratio R that does not form the zonule B of light reflection spot 12 is 0%.

In embodiment 3, the configuration of the light reflection spot of the zonule B among the virtual region A is changed shown in Fig. 8 (b) like that.In embodiment 3, the ratio R that does not form the zonule B of light reflection spot 12 is 33.3%.

In embodiment 4, the configuration of the light reflection spot of the zonule B among the virtual region A is changed shown in Fig. 8 (c) like that.In embodiment 4, the ratio R that does not form the zonule B of light reflection spot 12 is 55.6%.

In embodiment 5, the configuration of the light reflection spot of the zonule B among the virtual region A is changed shown in Fig. 8 (d) like that.In embodiment 5, the ratio R that does not form the zonule B of light reflection spot 12 is 66.7%.

(comparative example 1)

In process flow diagram shown in Figure 5, similarly to Example 1, implemented the lining rate and set operation S11, grid setting operation S12, light reflection spot condition enactment operation S13.Afterwards, divide the luminous intensity distribution reflection spot to dummy grid g randomly by utilizing random number, designed the light distribution patterns of light reflection spot.Except the light distribution patterns this point of having utilized the light reflection spot of designing like this, method has similarly to Example 1 obtained light guide plate.

(embodiment 6)

In embodiment 6, the lining rate is changed to 1.9%, and the number (n) of the light reflection spot 12 among the virtual region A is changed to 5.Along with the change of the number (n) of light reflection spot 12, the configuration of the light reflection spot 12 in the virtual region A is changed shown in Fig. 9 (a) like that.Fig. 9 (a) is the accompanying drawing of the configuration of the interior light reflection spot 12 of the virtual region A among the expression embodiment 6.In embodiment 6, the number (n) of the light reflection spot 12 among the virtual region A is 5, and L1 and L2 are 6 similarly to Example 1, so N1e _MinWith N2e _MinBe combined as (2,3) or (3,2).In embodiment 6, suppose N1e _Min=2, N2e _Min=3.Therefore, when importing the concept of zonule B similarly to Example 1, the quantity (M1) of the dummy grid g of the 1st direction x of the formation zonule B among the embodiment 6 is 3, and the quantity of the dummy grid g of the 2nd direction y (M2) is 2.In embodiment 6, the ratio R that does not form the zonule B of light reflection spot is 16.7%.

(embodiment 7)

The configuration this point of the light reflection spot 12 in having changed virtual region A, method has similarly to Example 6 obtained the light guide plate of embodiment 7.Utilize the concept of zonule B to illustrate with the difference of embodiment 6.

In embodiment 7, the configuration of the light reflection spot 12 of the zonule B among the virtual region A is changed shown in Fig. 9 (b) like that.Fig. 9 (b) is the accompanying drawing of the configuration of the interior light reflection spot 12 of the virtual region A among the expression embodiment 7.In embodiment 7, the ratio R that does not form the zonule B of light reflection spot 12 is 83.3%.

(comparative example 2)

With respect to embodiment 1, the situation of comparative example 1 too, except the configuration of 5 light reflection spots 12 in the virtual region A is to use random number to be configured randomly this point, method has similarly to Example 6 obtained the light guide plate of comparative example 2.

(embodiment 8)

In embodiment 8, the lining rate is changed to 1.5%, and the number of the light reflection spot 12 among the virtual region A is changed to 4.Along with the change of the number of light reflection spot 12, the light distribution patterns of light reflection spot 12 is changed shown in Figure 10 (a) like that.Figure 10 (a) is the accompanying drawing of the configuration of the interior light reflection spot 12 of the virtual region A among the expression embodiment 8.In embodiment 8, N1e _Min=N2e _Min=2.Introduced similarly to Example 1 under the situation of concept of zonule B, the quantity (M1) of dummy grid g that constitutes the 1st direction x of the zonule B among the embodiment 8 is 3, and the quantity of the dummy grid g of the 2nd direction y (M2) also is 3.In embodiment 8, the ratio R that does not form the zonule B of light reflection spot 12 is 0%.As described above, except having changed lining rate and light distribution patterns this point, method has similarly to Example 1 obtained the light guide plate of embodiment 8.

(embodiment 9)

The configuration of the light reflection spot 12 in virtual region A is changed this point, and method has similarly to Example 8 obtained the light guide plate of embodiment 9.For with the difference of embodiment 8, utilize the concept of zonule B to describe.In embodiment 9, the configuration of the light reflection spot 12 of the zonule B among the virtual region A is changed shown in Figure 10 (b) like that.Figure 10 (b) is the accompanying drawing of the configuration of the interior light reflection spot 12 of the virtual region A among the expression embodiment 9.In embodiment 9, the ratio R that does not form the zonule B of light reflection spot 12 is 75.0%.

(comparative example 3)

With respect to embodiment 1, with the situation of comparative example 1 similarly, be configured randomly this point except the configuration of 4 light diffusion points in the virtual region A is to use random number, method has similarly to Example 8 obtained the light guide plate of comparative example 3.

(embodiment 10)

In embodiment 10, except utilizing with 9 virtual region A shown in Figure 11 as a unit, and this unit carried out 2 dimension arrangements and to obtain outside the light distribution patterns this point, the method same with the situation of embodiment 1 obtained light guide plate.In Figure 11, be benchmark with upper left virtual region A, 9 virtual region A are called virtual region A _{I, j}(1≤i≤3,1≤j≤3).Virtual region A _1,1, A _1,3, A _2,2, A _3,1, A _3,3Identical with the virtual region A among the embodiment 1.Other virtual region A _1,2, A _2,1, A _2,3, A _3,2Except the configuration this point that has changed light reflection spot 12, be with the virtual region of the same condition of the virtual region A of embodiment 1 design.In unit shown in Figure 11, if pay close attention to the virtual region A of central authorities _2,2, virtual region A then _2,2With 4 virtual region A _1,1, A _1,3, A _3,1, A _3,3It is the translation symmetry.Arranged in the light guide plate of the embodiment 10 that forms by 2 dimensions by the unit that 9 virtual region A shown in Figure 11 constitute, when paying close attention to virtual region A shown in Figure 11 _2,2The time, surrounding virtual region A _2,224 virtual region A in 16 virtual region A and virtual region A _2,2Be the translation symmetry.

(embodiment 11)

In embodiment 11, shown in Figure 12 (a)～Figure 12 (e), designed virtual region A like that.The virtual region A of Figure 12 (a) is identical with the virtual region A of embodiment 1.The virtual region A that Figure 12 (b)～Figure 12 (e) illustrates respectively is except the different this point of the configuration of light reflection spot 12, to be designed with the same condition of the virtual region A of embodiment 1.For convenience of explanation, the virtual region A of Figure 12 (a)～Figure 12 (e) is called as virtual region A1, A2, A3, A4, A5 respectively.The light guide plate of embodiment 11 has following light distribution patterns, be about to along the 1st direction x and the 2nd direction y dispose 3 virtual region A respectively and the zone that constitutes as unit area, this unit area is carried out 2 dimensions arranges.In the light distribution patterns of the light guide plate of embodiment 11, in the constituent parts zone, dispose 1 virtual region A1,2 virtual region A2,2 virtual region A3,3 virtual region A4,1 virtual region A5 randomly.

Figure 13 is the accompanying drawing of a unit area in a plurality of unit areas of expression.With the situation of Figure 11 similarly, as benchmark, 9 virtual region A are called as virtual region A respectively with upper left virtual region A _{I, j}(1≤i≤3,1≤j≤3).

9 virtual region A of unit area shown in Figure 13 and the corresponding relation of the virtual region A1～A5 shown in Figure 12 (a)～Figure 12 (e) are as follows.Virtual region A _1,1A5 is corresponding with virtual region.Virtual region A _1,2, A _3,2A2 is corresponding with virtual region.Virtual region A _1,3, A _2,3, A _3,1A4 is corresponding with virtual region.Virtual region A _2,1, A _3,3A3 is corresponding with virtual region.Virtual region A _2,2A1 is corresponding with virtual region.

In the constituent parts zone, virtual region A1～A5 is configured randomly with aforesaid number, and therefore, for example, the light distribution patterns in the light distribution patterns in the unit area of other adjacent with unit area shown in Figure 13 and the unit area shown in Figure 13 is different.

(evaluation method and evaluation result)

This evaluation is being used LED as the BRAVIA(KDL-40EX700 processed of the television unit＜Sony Corp of light source)＞in, the light guide plate of having assembled embodiment 1～11 and comparative example 1～3 respectively replaces the light guide plate of this television unit installation.And, be provided with in light guide plate under the state of 1 diffuser that is installed on television unit, light television unit, by near the gray scale inequality of (light in part) the visual valuation light source, and carried out the gray scale measurement.

Gray scale is to dispose opposed to each other by CA-2000 and diffuser with Konica Minolta system, measures in the scope of 400 * 300 pixels.Measure by this, obtained 300 measurement points and be 400 grey scale curve.At each grey scale curve, calculated the curve of approximation of linear function.The slope one of this curve of approximation is regularly corresponding with the desirable grey scale curve that does not have the gray scale inequality.In the evaluation of embodiment 1～11 and comparative example 1～3, the curve of approximation of calculating is estimated with following formula with the deviation as the grey scale curve of measurement result.

[several 2]

In the formula (2), k is the numbering of measurement point.Q _kIt is the measured value of k measurement point.q _kIt is the guess value according to curve of approximation of k measurement point.Defined under the situation of deviation with formula (2), deviation is more big, and then the gray scale inequality is more big.

The evaluation result of embodiment 1～5 and comparative example 1 as shown in figure 14.Embodiment 6,7 and the evaluation result of comparative example 2 as shown in figure 15.

Embodiment

8,9 and the evaluation result of comparative example 3 as shown in figure 16.Embodiment 10,11 evaluation result are as shown in figure 17.In the chart of Figure 14～shown in Figure 17, represented the design conditions of alignment pattern of the light reflection spot of aforesaid embodiment 1～11 and comparative example 1～3 in the lump.

In the chart of Figure 14～Figure 17 " n() " be the number of the light reflection spot 12 among the virtual region A." N1e in the chart of Figure 14～Figure 17 _Min", " N2e _Min" and the situation of " M1 ", " M2 " and the concept of having introduced zonule B under the " N1e that illustrates _Min", " N2e _Min" and " M1 ", " M2 " be identical." N in the chart of Figure 14～Figure 17 ₈" paying close attention to a virtual region A, the virtual region A with paying close attention among 8 virtual region A adjacent with this virtual region A is the quantity of the virtual region A of translation symmetry." N in the chart of Figure 14～Figure 17 ₂₄" paying close attention to a virtual region A, the virtual region A with paying close attention to that surrounds among 24 virtual region A of this virtual region A is the number of the virtual region A of translation symmetry.In embodiment 11, in each unit area in a plurality of unit areas, the virtual region A1～A5 shown in Fig. 8 (a)～Fig. 8 (d) disposes randomly with aforesaid number, has therefore omitted N ₈, N ₂₄Record." ratio R(%) " expression in the chart of Figure 14～Figure 17 does not form the ratio of the zonule B of light reflection spot." deviation " in the chart of Figure 14～Figure 17 is the deviation by formula (2) definition.

For the visual result of Figure 14～shown in Figure 17, near the light in part of light guide plate, the situation of not visual gray scale inequality to the mist and clouds shape represents that with " zero " visual situation to the gray scale inequality is represented with " * ".

As the evaluation result of Figure 14～shown in Figure 17, not visual gray scale inequality to the mist and clouds shape in embodiment 1～11, but in comparative example 1～3, produced the gray scale inequality significantly.In addition, in the different embodiment 1～11 of the light distribution patterns of light reflection spot 12, compare with the situation of comparative example 1～3, little from the deviation of curve of approximation.Therefore, can recognize that the light distribution patterns by designing with the light distribution patterns design process S10 that utilizes Fig. 5 disposes light reflection spot 12, can reduce near the gray scale inequality of the mist and clouds shape of light in part.

More than, embodiment of the present utility model and embodiment have been described, but the utility model is not limited to above-mentioned embodiment and embodiment.For example, the light reflection spot also can utilize serigraphy to form except ink jet printing.

Claims

1. a light guide plate comprises the light guide plate base material that transmits light, it is characterized in that,

This light guide plate possesses a plurality of smooth reflection spot at least one side's who is formed at described light guide plate base material surface,

Namely put in each virtual region that formation face is divided into a plurality of and a plurality of virtual regions of obtaining uniformly-spaced, virtually on the surface that will form a plurality of described smooth reflection spots, two-dimensional arrangements has a plurality of dummy grid as the printing target regularly,

In the dummy grid of the regulation of a plurality of described dummy grid of two-dimensional arrangements, be formed with described smooth reflection spot,

Be formed with a plurality of described smooth reflection spots according to following light distribution patterns at described some formation face, namely, this light distribution patterns is the light distribution patterns that the configuration of the configuration of the described smooth reflection spot in the described virtual region of selecting and the described smooth reflection spot at least one the described virtual region in remaining a plurality of described virtual region constitutes the translation symmetry from a plurality of described virtual regions.

2. light guide plate according to claim 1 is characterized in that,

The configuration of the described smooth reflection spot in the described virtual region more than 6 in 24 described virtual regions of the configuration of the described smooth reflection spot in the described described virtual region of selecting and the described described virtual region of selecting of encirclement constitutes the translation symmetry.

3. light guide plate according to claim 1 and 2 is characterized in that,

The configuration of the described smooth reflection spot in the described virtual region more than 4 in the configuration of the described smooth reflection spot in the described described virtual region of selecting and 8 described virtual regions adjacent with a described described virtual region of selecting constitutes the translation symmetry.

4. light guide plate according to claim 1 and 2 is characterized in that,

In each virtual region of a plurality of described virtual regions,

Maximum gauge in the diameter of a plurality of described smooth reflection spots in will being formed at described virtual region is expressed as D μ m,

Be L1 with the quantitaes of the described dummy grid of the 1st orientation in the described two-dimensional arrangements,

And will with described two-dimensional arrangements in the quantitaes of described dummy grid of the 2nd orientation that intersects of described the 1st orientation when being L2,

10μm＜D≤300μm，

2＜L1≤200, and 2＜L2≤200.

5. light guide plate according to claim 1 and 2 is characterized in that,

In each virtual region of a plurality of described virtual regions,

Described virtual region is divided into a plurality of zonules,

Described zonule is following zone, namely,

When the number with the described smooth reflection spot in the described virtual region is expressed as n, and n＞1,

Will with described two-dimensional arrangements in the quantitaes of described dummy grid of the 2nd orientation that intersects of described the 1st orientation be L2,

The set that will be made of the common divisor of described L1 and described L2 is expressed as N1, N2 respectively,

The key element that constitutes described N1 and described N2 is expressed as N1e, N2e respectively,

X is defined as N1e * N2e-n,

Y is defined as N1e+N2e,

Be M1 with the quantitaes of the described dummy grid of described the 1st orientation of described zonule,

When the quantitaes of the described dummy grid of described the 2nd orientation of described zonule is M2,

Described M1 is L1/N1e _Min,

Described M2 is L2/N2e _Min,

Wherein, in each virtual region of a plurality of described virtual regions, do not form the ratio of described zonule of described smooth reflection spot below 75%.

6. light guide plate according to claim 1 and 2 is characterized in that,

The a plurality of described smooth reflection spot that is formed at described some formation face comprises the described smooth reflection spot more than 2 kinds that varies in size.

7. edge light profile light supply apparatus, it possesses:

Any described light guide plate in the claim 1～6; And

Side light source supplying light to described light guide plate.

8. permeation type visual display unit, it possesses:

The described planar light source device of claim 7; And

The infiltration type image displaying part that disposes opposed to each other with the exit facet of described planar light source device.