CN102411165A - Light-guide Apparatus With Micro-structure, Back Light Unit Comprising The Same And Liquid Crystal Display Comprising The Same - Google Patents

Abstract

A uniform reflective light-guide for accompanying an edge light source to form a backlight module for an LCD display includes a light-guiding layer and a reflective layer. The light-guiding layer further defines a light-introducing surface and a light-exiting surface. The light-introducing surface is to allow lights emitted from the edge light source to enter the light-guiding layer. The light-exiting surface perpendicular to the light-introducing surface is to allow at least a portion of the lights to leave the light-guiding layer. The reflective layer is to reflect the incident lights back to the light-guiding layer. The reflective layer and the light-guiding layer are manufactured integrally into a unique piece by a co-extrusion process so as to avoid possible existence of an air spacing in between. A reflective surface is defined to interface the reflective layer and the light-guiding layer, and a three-dimensional micro-structure is constructed on the reflective surface.

Description

Guiding device and have the module backlight and the LCD of this guiding device

Technical field

The present invention relates to the guiding device technical field, particularly relate to a kind of guiding device and have the module backlight and the LCD of this guiding device.

Background technology

LGP (Light Guide Plate) is the light boot media in the display backlight module; At present; Most modules backlight are side light type (Edge Type); Utilize LGP to guide the light of side direction, its front from display is penetrated, thereby improved the briliancy (luminance) of panel and control the even of brightness.

The principle of work of LGP is to reflect after making light get into LGP; Light is reached the other end of LGP; Special, a side ad hoc structure of LGP capable of using produces the diffusion phenomena of all angles, and reflected light is directed to the LGP front; Refractive index is big more, and its leaded light ability is just good more.In addition, except the light in directive front, some light also can receive the reflection of the reflecting plate bottom the LGP and imported LGP once more.

As shown in Figure 1, be United States Patent (USP) the 7th, 108; The light source module of No. 385 (bulletin) disclosed light-emitting components on September 19th, 2006, it discloses a kind of LGP, wherein; The plane 523 that liquid crystal panel 57, diffusion barrier 56, water chestnut mirror module 55, light source module 50, light penetrate; LGP 520 and reflecting plate 524, circuit board 51 and reflector layer 54 in the light source module 50, above-mentioned each element forms a module 5 backlight.

Yet each element in the LGP that prior art provides (for example reflector plate, LGP, diffusion sheet, rhombus lens etc.) has shortcoming separately, can reduce like following table 1:

Table 1

As shown in Figure 2, the LGP 520 that prior art provides can face light loss problem in the light conductive process.In order to increase catoptrical effect at module 5 backlight; Prior art can increase a reflecting plate 524 newly; Owing between this existing reflecting plate 524 and the LGP 520 air layer 525 is arranged; Thereby this will cause the loss of light 581 to increase about 8%, and this has reduced light utilization efficiency, and can increase the processing procedure program and the cost of module 5 backlight.

In addition,, then be prone to, cause product percent of pass to be difficult to control and bright band disappearance because of the printing LGP need pass through operations such as half tone, printing ink, wire mark if the LGP that prior art provides takes to print the LGP technology.The bright band synoptic diagram of the LGP 520 that Fig. 3 provides for prior art.As shown in Figure 3, on the exiting surface of LGP 520 because of the inhomogeneous centre part therein of bright dipping occur strip brightest area 582 (that is bright line), inferior bright area 583 and outermost than dark areas 584.

As stated, prior art can increase optical loss owing between LGP and the sheet material air layer is arranged, and causes module cost backlight higher, and tangible bright line phenomenon is arranged, and the processing of water chestnut mirror module is difficult and microstructure is fragile, thereby the space of further improvement is arranged.

Summary of the invention

Fundamental purpose of the present invention is to be the module backlight and the LCD that a kind of guiding device are provided and have this guiding device; This guiding device is simple integrated three layers of multiple equipment structure of extrusion processing procedure altogether, has the light utilization efficiency of lifting, makes that bright dipping is more even, more blast of briliancy, reduction module cost backlight, do not need advantage such as water chestnut mirror module.

The technical scheme that the present invention solves the problems of the technologies described above is following: use in a kind of guiding device, this guiding device sidelight source of can arranging in pairs or groups; This guiding device comprises:

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from this incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer; And

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface;

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid.

The invention has the beneficial effects as follows: one side increases microstructure and one deck reflection horizon to the guiding device that the present invention proposes in the bottom of optical waveguide layer, and guiding device forms simultaneously therewith, makes no air interface layer between reflection horizon and optical waveguide layer in this guiding device.Owing to do not have air layer between reflection horizon of the present invention and the optical waveguide layer sheet material; With the prior art that the airspace is arranged in comparison; Guiding device of the present invention can not need water chestnut mirror module can promote light utilization efficiency, and its microstructure also can be used for the reflection and the light diffusion phenomena of optical waveguide layer, reaches the effect of reflection and leaded light simultaneously; Can effectively reduce below the optical loss to 4%, make that bright dipping is more even, more blast of briliancy.Simultaneously, because the processing procedure of the guiding device among the present invention is through simplifying, so can reduce guiding device pad pasting program, module group procedure program backlight and cost.

On the basis of technique scheme, the present invention can also do following improvement:

Further, the depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression:

and n1＜n2; Wherein, H2 is the degree of depth of the microstructure of said reflecting surface, and P2 is the width of the microstructure of said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

Further, the depth-to-width ratio of the microstructure on the said reflecting surface meets one of following at least condition:

Condition one: $0.233\&le;\frac{H2}{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HSA00000539346500031.png,HSA00000539346500131.png"\; state="\{\{state\}\}">P</figure-callout>}2}\&le;0.419;$

The value of condition two: P2 is between 80 μ m to 250 μ m;

Condition three: the value of the depth-to-width ratio of said microstructure

is between 0.2 to 0.319, and the scope of the ratio of the thickness t 2 of the thickness t 1 of said equal photosphere and optical waveguide layer is

Condition four: said microstructure is discrete microstructure, and between adjacent two microstructures apart from the value of G between between the 0mm to 1.4mm.

Further, said guiding device also comprise following at least one of them:

A plurality of diffusion particles are arranged in said optical waveguide layer;

A plurality of diffusion particles are arranged in said equal photosphere;

The microstructure of a solid that on said exiting surface, is provided with;

Two kinds of plastics of different refractivity are blended in the said reflection horizon;

A plurality of reflective particles are arranged in said reflection horizon; And

A uneven surface or a cloudy surface that may command density changes are positioned on the said exiting surface.

Further; When said a plurality of diffusion particle is arranged in the said optical waveguide layer; The value of the poor Δ n1 of the refractive index of the diffusion particle in the said optical waveguide layer and the plastic basis material of said optical waveguide layer itself satisfies 0.04＜Δ n1＜0.1; The particle diameter of the diffusion particle in the said optical waveguide layer is between 2 μ m and 10 μ m, and the refractive index of the plastic basis material of said optical waveguide layer itself is between 1.42 and 1.63;

When said a plurality of diffusion particle is arranged in the said equal photosphere; The poor Δ n2 value satisfied 0.04＜Δ n2 of system＜0.1 of the refractive index of the diffusion particle in the said equal photosphere and the plastic basis material of said equal photosphere itself; The particle diameter of the diffusion particle in the said equal photosphere is between 2 μ m-10 μ m, and the refractive index of the plastic basis material of said equal photosphere itself is between 1.42 and 1.63;

When being mixed with the plastics of two kinds of different refractivities in the said reflection horizon, the blending ratio of two kinds of plastics of said different refractivity is 7: 3;

When in the said reflection horizon a plurality of reflective particle being arranged; The refractive index of said reflective particle is between 2.2-3.2; And the percentage by weight of said reflective particle is less than 0.5%; And the particle diameter of said reflective particle is between 4 μ m and 50 μ m, and the refractive index of the plastic basis material in said reflection horizon itself is between 1.6 and 2.5, and the difference of the refractive index of said reflection horizon and said optical waveguide layer is between 0.05 and 1; And

When having said uneven surface on the said exiting surface, the value of the roughness Ra of said exiting surface satisfies 1 μ m＜Ra＜6 μ m.

Further, when having said uneven surface on the said exiting surface, the value of the roughness Ra of said exiting surface satisfies 1 μ m＜Ra＜2.21 μ m.

Further, said exiting surface is provided with the microstructure of a solid, and the orientation of the orientation of the microstructure on said exiting surface and the microstructure of said reflecting surface is parallel to each other or is mutually orthogonal.

Further, the microstructure on microstructure on the said exiting surface and said reflecting surface be following one of them:

Microstructure with most long and narrow and continuity triangle strips of being arranged in parallel;

Microstructure with most long and narrow and continuity semicircle strips of being arranged in parallel;

Have the microstructure of majority with the continuity taper of the solid of arrayed;

Has majority with the spherical microstructure of the continuity of the solid of arrayed;

Have the microstructure of majority with the continuity arcuation taper of the solid of arrayed;

Have most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Has the microstructure that most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel, equidistance density change;

Have most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Has the microstructure that most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel, equidistance density change;

Have most with the three-dimensional taper of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Have most long and narrow and microstructures that change with the three-dimensional taper of the noncontinuity of arrayed, equidistance density;

Have most with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Have most microstructures that change with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance density;

Have most with the noncontinuity arcuation taper microstructure of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place; And,

Microstructure with most noncontinuity arcuation taper microstructures, the variation of equidistance density with arrayed.

The invention allows for a kind of module backlight with guiding device, this module backlight comprises:

One sidelight source;

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from said incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer;

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface; And

At least one blooming is covered on the said exiting surface;

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid; And,

The depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression:

And n1＜n2;

Wherein, H2 is the degree of depth of the microstructure on the said reflecting surface, and P2 is the width of the microstructure on the said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

In addition, the invention allows for a kind of LCD with guiding device, this LCD comprises:

One sidelight source;

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from this incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer;

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface;

At least one blooming is covered on the said exiting surface; And

One liquid crystal panel is positioned at said blooming than the side away from said optical waveguide layer;

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid; And,

The depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression:

And n1＜n2;

Wherein, H2 is the degree of depth of the microstructure on the said reflecting surface, and P2 is the width of the microstructure on the said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

Description of drawings

The light source module synoptic diagram of the light-emitting component that Fig. 1 provides for prior art.

The synoptic diagram of optical loss takes place in the LGP that Fig. 2 provides for prior art in the light conductive process.

The bright band synoptic diagram of the LGP that Fig. 3 provides for prior art.

Fig. 4 is the synoptic diagram of first embodiment of guiding device provided by the invention.

Fig. 5 reduces the synoptic diagram of optical loss for guiding device first embodiment provided by the invention.

Fig. 6-A to Fig. 6-C is a briliancy graph of relation of guiding device provided by the invention.

Fig. 7 is the multiple enforcement aspect synoptic diagram of reflection horizon, optical waveguide layer and equal photosphere structure in the guiding device provided by the invention.

Fig. 8-A to Fig. 8-O is respectively the different embodiment synoptic diagram of the microstructure on the guiding device provided by the invention.

Fig. 9 is another embodiment synoptic diagram of guiding device provided by the invention.

Figure 10 is an embodiment process flow diagram that is used for making the common extrusion processing procedure of guiding device provided by the invention.

Figure 11 is an embodiment synoptic diagram that is used for making the common extrusion processing procedure of guiding device provided by the invention.

Figure 12 is the sandblast processing procedure synoptic diagram that is used on the exiting surface of guiding device, forming uneven surface provided by the invention.

Figure 13-A is an embodiment synoptic diagram again of guiding device provided by the invention.

Figure 13-B is the corresponding curve map between angle and the luminance brightness of light type of the guiding device provided by the invention test exiting surface shown in Figure 13-A.

Figure 14 is the embodiment synoptic diagram of luminance brightness of the exiting surface of measurement guiding device provided by the invention.

Figure 15-A, 15-B and 15-C, the reflecting surface depth-to-width ratio

that is respectively in the explanation guiding device provided by the invention is implemented illustration for the difference of the influence of light reflecting effect.

Description of drawings:

1, the guiding device of 1a, 1b-tool microstructure

11,11a, 11b, 11c, 11d, 11e-reflection horizon

111,111a-reflective particle

112,112a, 112b, 112c, 112d, 112e-reflecting surface

12,12a, 12b, 12c, 12d, 12e-optical waveguide layer

122,122a-diffusion particle

13,13a, 13b, 13c, 13d, the equal photosphere of 13e-

131,131a-diffusion particle

132,132a, 132b, 132c, 132d, 132e-exiting surface

15-incidence surface 2-sidelight source

20,20c, 20d, 20e-light

201,203-reflection 202-bright dipping

21,22,23-charging basket 24-screw mixing

25-extrusion mould R1, R2 and R3-roller

31-sand blasting unit 32-nozzle

33-roller surface 41,42-field

411,412,413,414,421,422,423,424-figure

4111,4121,4131,4141,4211,4221,4231,4241-exiting surface

4112,4122,4132,4142,4212,4222,4232,4242-reflecting surface

5-module 50-backlight light source module

51-circuit board 520-tabula rasa

The plane 524-reflecting plate that 523-light penetrates

54-reflector layer 55-water chestnut mirror module

56-diffusion barrier 57-liquid crystal panel

581-light 582-brightest area

583-bright area 584-is than dark areas

590-blooming 801,812,813,814,815-microstructure

Embodiment

Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.

The invention relates to a kind of guiding device.This guiding device is with the one-body molded making of extrusion processing procedure altogether and with reflection, all light and light-guiding function, use in its sidelight source of collocation, can constitute the module backlight of a display.Equally, this guiding device can also be applied in the LCD.

In order more clearly to describe guiding device proposed by the invention and to have the module backlight and the LCD of this guiding device, cooperate Figure of description to be elaborated below.

(1) to the general introduction of apparatus of the present invention (three-decker):

As shown in Figure 4; The guiding device 1 that the present invention proposes; Be meant the guiding device of a kind of All-in-One (ALL IN ONE) especially,, on the optical waveguide layer of guiding device and the reflecting surface between the reflection horizon, form three-dimensional microstructure through the integrated conformability processing procedure of extrusion altogether; Make and utilize single guiding device can reach all effects of light, leaded light and light reflection, it can be applicable to the large-scale panel of any sidelight source 2 forms.This guiding device 1 comprises:

One microstructure reflection horizon 11;

One optical waveguide layer 12; And

The equal photosphere 13 of one microstructure.

One of embodiment of the guiding device 1 that Fig. 4 proposes for the present invention.This guiding device 1 is the microstructure guiding device of simple integrated three layers of multiple material (for being total to the extrusion processing procedure).

(2) be provided with the general introduction in the reflection horizon 11 (lower floor) of microstructure among the present invention:

In several key concepts of the guiding device 1 that the present invention proposes one of them is to utilize the design of the microstructure on the reflecting surface to cause the reflex of light in guiding device 1 that is produced by sidelight source 2, traditional scatters light source with the site mode to replace; And this microstructure is formed on the reflecting surface between reflection horizon 11 and the optical waveguide layer 12, and then replaces the use of reflecting plate.Wherein, the diffusion particle that utilizes the equal photosphere 13 of microstructure forms area source with line source or pointolite, and makes equal photosphere 13 corresponding each other with the microstructure in reflection horizon 11, and then the use of replacement reflector plate, reaches reflection, leaded light reaches all effects of light.

Utilize above-mentioned technology, the present invention has reduced the optical loss that reflector plate produced, and main cause comes from reflector plate or the reflection horizon 11 that forms simultaneously with optical waveguide layer 12.As shown in Figure 5, a side increases microstructure and one deck reflection horizon 11 to the guiding device 1 that the present invention proposes in the bottom of optical waveguide layer 12, and guiding device 1 forms simultaneously therewith, makes reflection horizon 11 and 12 no air interface layers of optical waveguide layer in this guiding device 1.Owing to do not have air layer between reflection horizon 11 of the present invention and optical waveguide layer 12 sheet materials; With the prior art that the airspace arranged shown in Figure 2 in comparison; Guiding device 1 of the present invention can promote light utilization efficiency; Its microstructure also can be used for the reflection and the light diffusion phenomena of optical waveguide layer, reaches the effect of reflection and leaded light simultaneously, can effectively reduce below the optical loss to 4%.Simultaneously, because the processing procedure of the guiding device 1 among the present invention is through simplifying, so can reduce guiding device pad pasting program, module group procedure program backlight and cost.

And the preferred embodiment in the reflection horizon 11 of the guiding device 1 that the present invention proposes is:

(1) mixes or in the plastics of reflection horizon, add the mode of a spot of reflective particle with two kinds of plastics of different refractivity, make reflection horizon 11 of the present invention.

(2) if mix with two kinds of plastics of different refractivity and to make reflection horizon 11, then the blending ratio of different refractivity plastics is 7: 3.

(3) if make reflection horizon 11 with the mode of adding reflective particle 111, then the refractive index of reflective particle 111 is 2.2-3.2, and the percentage by weight of reflective particle is less than 0.5%.

(4) particle diameter 111 of reflective particle is between 1 μ m-100 μ m, and optimum range is 4 μ m-50 μ m.

(5) refractive index of the plastic basis material in reflection horizon 11 itself is between 1.6-2.5.

(6) difference of the refractive index of reflection horizon 11 and optical waveguide layer 12 is between 0.05-1.

(3) general introduction of the equal photosphere 13 of microstructure (upper strata) among the present invention::

In the embodiment of the guiding device 1 that the present invention proposes; Also utilize a plurality of small diffusion particle 131 that is added in the equal photosphere 13 of microstructure that line source or pointolite are formed area source; Reach equal light and the effect that hides the flaw, the difference through refractive index promotes light utilization efficiency.

The preferred embodiment of the equal photosphere 13 of microstructure of the guiding device 1 among the present invention can for:

(1) in equal photospheres 13, adds a spot of diffusion particle 131 or to the processing that atomizes of the surface of the exiting surface 132 of equal photosphere 13.

(2) diffusion particle 131 satisfies 0.04＜Δ n2＜0.1 with the poor Δ n2 of the refractive index of the plastic basis material of equal photosphere 13.

(3) particle diameter of diffusion particle 131 is between 2 μ m-10 μ m.

(4) all the roughness (Ra) of the upper surface (exiting surface 132) of photosphere 13 satisfies 1 μ m＜Ra＜6 μ m, can promote briliancy and uniformity coefficient.

(5) all the refractive index of the plastic basis material of photosphere 13 itself between 1.42-1.63.

(4) microstructure among the present invention:

Among the embodiment of guiding device 1 in the present invention, be defined as a reflecting surface on optical waveguide layer 12 and 11 adjacent surfaces (top side face of the bottom side of optical waveguide layer 12 just, or reflection horizon 11), reflection horizon.The present invention increases a plurality of microstructures on this reflecting surface and/or on the upper surface (exiting surface 132) of equal photosphere 13.In the present invention, the distance between each microstructure is equidistance, not equidistant or staggered microstructure.Each microstructure can be that three-dimensional (for example: structure pyramid), each mask have asymmetric or symmetrical triangular shape, the side is asymmetric or symmetrical triangular shape structure, column structure, arcuate structure etc.Preferred embodiment is following:

The depth-to-width ratio of each microstructure of reflecting surface and/or exiting surface

is between 0.02-0.8; And the width of each microstructure is preferable between 80 μ m-250 μ m.

Depth of microstructure (H2) both sides relation of reflector thickness (Rh) and reflecting surface satisfies

therefore, has reflection and light guide effect concurrently.

(5) light guide effect and the thickness relationship in microstructure reflection horizon of the present invention 11 (lower floors):

Among the embodiment of the guiding device 1 among the present invention; The thickness of its reflection horizon 11 microstructures and the relation of going into light quantity; Can draw a preferable scope, just the thickness in reflection horizon 11 should not be greater than 1/10 of the gross thickness of body (being equal photosphere 13, optical waveguide layer 12 and reflection horizon 11 threes' thickness sum).

(6) relation of the degree of depth of thickness in microstructure reflection horizon (lower floor) and microstructure among the present invention:

See also Fig. 6-A to Fig. 6-C, it is a briliancy graph of relation of the guiding device of the present invention's proposition.Diaxon relation data in this curve map is following: wherein that longitudinal axis reflection is the briliancy (L that whole microstructure forms; Luminance); Just at the brightness value that exiting surface measured, transverse axis is the thick dark relation value of reflection horizon microstructure of inverse (being 1/H2) of the degree of depth of the thickness (Rh) in the reflection horizon microstructure that is multiplied by reflecting surface.

Therefore, can know that different reflector thickness and depth of microstructure ratio have different influences for the briliancy of exiting surface according to the data of Fig. 6.Value as

is in

scope the time; The effect that reflection and leaded light can be arranged simultaneously; The reflectivity in reflection horizon is about 80%, and then can to make reflectivity cross low or even light effect not good if exceed this scope; And; When the value as

further drops in the optimum range

; The guiding device that the present invention proposes can further provide higher briliancy on exiting surface, this also is the optical appearance with preferable reflection and even light.

(7) relation of thickness, concentration and the uniformity coefficient of equal photosphere 13 among the present invention:

Among the embodiment of the guiding device 1 that the present invention proposes, all photosphere 13 is following with the embodiment of the relation of thickness, concentration and the uniformity coefficient of optical waveguide layer 12:

(1) adds a small amount of diffusion particle in the optical waveguide layer 12, can solve phenomenons such as bright band and uniformity coefficient be not good.

(2) particle diameter of diffusion particle is more little, and the identical distribution that penetrates is just narrow more.

(3) particle diameter of diffusion particle is big more, and the identical distribution that penetrates is just wide more.

(4) change with the difference of refractive index and required interpolation concentration; Change with size and required interpolation concentration.

Guiding device 1 among the present invention through in optical waveguide layer 12, adding a small amount of diffusion particle, can solve the not good problem of bright band and uniformity coefficient, also can promote the utilization factor of light; When the satisfied 0.04＜Δ n1 of poor Δ n1 of the refractive index of the plastic basis material of diffusion particle and optical waveguide layer 12 itself＜0.1, can keep the state of high penetration.And the particle diameter of the diffusion particle in the optical waveguide layer 12 is between 2 μ m and 10 μ m, and the refractive index of the plastic basis material of this optical waveguide layer 12 own is between 1.42-1.63.

Wherein, the equal photosphere 13 among the present invention and the thickness of optical waveguide layer 12 are than, equal concentration of photosphere 13 and diffusion particle, and is relevant with briliancy and light uniformity coefficient.

The factor that influences the roughness of optical waveguide layer 12 shapes and equal photosphere 13 in the guiding device 1 that the present invention proposes has:

(1) all (when just having roughness) during the out-of-flatness of photosphere 13 surfaces (exiting surface 132) helps and promotes the LGP brightness value.

(2) roughness on equal photosphere 13 surfaces (exiting surface 132) changes with the microstructure of the reflecting surface in reflection horizon 11.

The advantage of the roughness (Ra) on equal photosphere 13 surfaces (exiting surface 132): (1) increases the LGP briliancy; (2) solve the bright band problem; (3) improve uniformity coefficient.

Therefore, in the relation of the roughness (Ra) of equal exiting surfaces 132 of photosphere 13 and briliancy (L), roughness can obtain briliancy preferably in 1 μ m-6 mu m range.

(8) other various embodiments of the guiding device concrete structure of the present invention's proposition:

In the guiding device 1 that the present invention proposes; All can add also in the photosphere 13 and can not add diffusion particle 131, and all photosphere 13 upper surfaces (exiting surface 132) can be the noncontinuity microstructure of mirror plane, cloudy surface plane, tool continuity microstructure, the design of one-sided light inlet and the multiple structures such as noncontinuity microstructure of bilateral light inlet design; Simultaneously, can add in the optical waveguide layer 12 also and can not add diffusion particle 122; Simultaneously, reflection horizon 11 also can be the noncontinuity microstructure of mirror plane, cloudy surface plane, tool continuity microstructure, the design of one-sided light inlet and the multiple structures such as noncontinuity microstructure of bilateral light inlet design with optical waveguide layer 12 both surface of contact (reflecting surface 112).Therefore, the reflection horizon 11 of above-mentioned various different designs, optical waveguide layer 12 and equal photospheres 13 are intersected after the collocation, can obtain the various embodiments of reflection horizon 11, optical waveguide layer 12 and equal photosphere 13 structures in the guiding device 1 that the present invention shown in figure 77 proposes.For instance; In the field 41 of Fig. 7; In regular turn four structural drawing 411,412,413,414 have shown respectively from top to bottom: have in its equal photosphere diffusion particle (Figure 41 1,412) with do not have diffusion particle (Figure 41 3,414) but the equal photosphere upper surface (exiting surface 4111,4121,4131,4141) of four (Figure 41 1,412,413,414) all be have continuity structural design and reflection horizon and optical waveguide layer surface of contact (reflecting surface 4112,4122,4132,4142) be plane (minute surface or cloudy surface) four embodiment (wherein; In the optical waveguide layer of Figure 41 1,413 embodiment diffusion particle is arranged, but Figure 41 2,414 embodiment do not have then).And for example; Four structural drawing 421,422,423,424 in the field 42 shown respectively have in its equal photosphere diffusion particle (Figure 42 1,422) with do not have diffusion particle (Figure 42 3,424) but four equal photosphere upper surface (exiting surface 4211,4221,4231,4241) all be plane (minute surface or cloudy surface) and reflection horizon with optical waveguide layer surface of contact (reflecting surface 4212,4222,4232,4242) be have a noncontinuity microstructure that the bilateral light inlet designs four embodiment (wherein; In the optical waveguide layer of Figure 42 1,423 embodiment diffusion particle is arranged, but Figure 42 2,424 embodiment do not have then); Other embodiment then analogize.In addition; In each embodiment of exiting surface and reflecting surface both microstructures (no matter being continuity, noncontinuity, the design of one-sided or two survey light inlet); Its orientation of being located at the orientation of the microstructure on the exiting surface and being located at the microstructure on the reflecting surface can be the relation that is parallel to each other, and also can be mutually orthogonal relation.

The guiding device 1 that the present invention proposes is except the structure of exiting surface and reflecting surface can diversifiedly arrange in pairs or groups and design; The design of the concrete structure of set microstructure also has many various embodiment on its exiting surface and/or the reflecting surface; Embodiment such as, but be not limited to shown in Fig. 8-A to Fig. 8-O illustrates as follows one by one:

Shown in Fig. 8-A, first embodiment of the microstructure on the guiding device 1 of the present invention, set microstructure can have the continuity triangle strip microstructure 801 that majority is long and narrow and be arranged in parallel on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-B, microstructure second embodiment on the guiding device 1 that the present invention proposes, set microstructure can have the continuity semicircle strip microstructure 802 that majority is long and narrow and be arranged in parallel on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-C, microstructure the 3rd embodiment on the guiding device 1 that the present invention proposes, set microstructure can have continuity taper (pyramid) microstructure 803 of majority with the solid of arrayed on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-D, microstructure the 4th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have majority with the spherical microstructure 804 of the continuity of the solid of arrayed on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-E, microstructure the 5th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have the continuity arcuation taper microstructure 805 of majority with the solid of arrayed on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-F; Microstructure the 6th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel on its exiting surface and/or the reflecting surface, equidistance and two side direction do not become the microstructure 806 that intensive may command density changes (be particularly suitable for bilateral light inlet just the left and right sides face of optical waveguide layer be the design of incidence surface) away from the incidence surface place.

Shown in Fig. 8-G; Microstructure the 7th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have the microstructure 807 that most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel, equidistance density change on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-H; Microstructure the 8th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel on its exiting surface and/or the reflecting surface, equidistance and two side direction do not become the microstructure 808 that intensive may command density changes (be particularly suitable for bilateral light inlet just the left and right sides face of optical waveguide layer be the design of incidence surface) away from the incidence surface place.

Shown in Fig. 8-I; Microstructure the 9th embodiment on the guiding device 1 that the present invention proposes, set microstructure can have the microstructure 809 that most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel, equidistance density change on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-J; Microstructure the tenth embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most with the three-dimensional taper (pyramid) of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure 810 that intensive may command density changes (be particularly suitable for bilateral light inlet just the left and right sides face of optical waveguide layer be the design of incidence surface) away from the incidence surface place on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-K; Microstructure the 11 embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most long and narrow and microstructures 811 that change with the three-dimensional taper (pyramid) of the noncontinuity of arrayed, equidistance density on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-L; Microstructure the 12 embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure 812 that intensive may command density changes (be particularly suitable for bilateral light inlet just the left and right sides face of optical waveguide layer be the design of incidence surface) away from the incidence surface place on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-M; Microstructure the 13 embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most microstructures 813 that change with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance density on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-N; Microstructure the 14 embodiment on the guiding device 1 that the present invention proposes, set microstructure can have most with the noncontinuity arcuation taper microstructure of arrayed, equidistance and two side direction do not become the microstructure 814 that intensive may command density changes (be particularly suitable for bilateral light inlet just the left and right sides face of optical waveguide layer be the design of incidence surface) away from the incidence surface place on its exiting surface and/or the reflecting surface.

Shown in Fig. 8-O; Microstructure the 15 embodiment on the guiding device 1 that the present invention proposes, set microstructure can have the microstructure 815 of most noncontinuity arcuation taper microstructures with arrayed, the variation of equidistance density on its exiting surface and/or the reflecting surface.

See also Fig. 9, another embodiment synoptic diagram of the guiding device 1a that proposes for the present invention.In the present embodiment, the upper surface of the equal photosphere 13a of this guiding device 1a (being exiting surface 132a) is gone up and on the reflecting surface 112a between reflection horizon 11a and the optical waveguide layer 12a, is respectively equipped with microstructure.Wherein, all right and wrong are successional to be located at microstructure on exiting surface 132a and the reflecting surface 112a; And, be located at the microstructure that the microstructure on the reflecting surface 112a is not only noncontinuity and is still had density to change.And; For noncontinuity and the reflecting surface 112a microstructure that has density to change; It is the most maximum near the spacing G between two adjacent microstructures on the reflecting surface 112a at incidence surface 15 places, and is then more little gradually away from the spacing G between the microstructure on the reflecting surface 112a at incidence surface 15 places.Change just more away from the microstructure of 15 spacing G of incidence surface more little (intensive more) through may command density is set on reflecting surface 112a, evenly avoid brighter more away from 15 dark more phenomenons of incidence surface near incidence surface 15 places thereby can reach bright dipping.And; During the preferred range of the spacing G value of structure that goes up set noncontinuity microstructure as this reflecting surface 112a between 0-1.4mm; If collocation is attached at least one blooming 590 on the exiting surface 132a again, its exiting surface 132a will not have the bright line phenomenon (bright line is not visual) take place.In like manner, if the similar above-mentioned noncontinuity and the microstructure of may command density variation are set, also can reach the even effect of similar bright dipping on exiting surface 132a.

Fit on the exiting surface 132a through the guiding device 1a that proposes in the present invention this at least one blooming 590 and one sidelight source 2 is set at incidence surface 15 places, other known accessories of arranging in pairs or groups again can constitute a module backlight.Afterwards, can this module backlight be combined a known liquid crystal panel 57 and constitute a LCD.

See also Figure 10 and Figure 11, be respectively an embodiment process flow diagram and the synoptic diagram that the present invention is used for making the common extrusion processing procedure of guiding device.Common extrusion processing procedure with the guiding device 1a among the present invention who makes the one-body molded three-decker of tool as shown in Figure 9 is an example; At first need to place secondary extruder 1 charging basket 21 of extrusion board to the plastics that contain reflective particle 111a that are used for forming reflection horizon 11a respectively; And be used for forming optical waveguide layer 12a contain different-grain diameter size and different refractivity diffusion particle 122a plastics place extrusion board master extruder charging basket 22, and place secondary extruder 2 charging baskets 23 of extrusion board to the plastics of the diffusion particle 131a that contains different-grain diameter size and different refractivity that is used for forming equal photosphere 13a.Wherein, optical waveguide layer 12a is with all the employed plastics of photosphere 13a and diffusion particle 122a, 131a can be identical but also can be material different.Then, the plastics in these charging baskets 21,22,23 are utilized screw mixing 24 respectively after, get into the major and minor layer of extrusion mould (T Die) 25.Afterwards, utilize R1, R2 and three groups of rollers of R3 that it is given as security synthetic shape again, and then the All-in-One among the integrated the present invention of extrusion and with reflection, leaded light and equal guiding device 1a of light function altogether.Plate one deck reflection horizon through the plated film mode at the optical waveguide layer lower surface compared to prior art, the present invention adopts the integrated technology of common signature to have more convenience and progressive on the processing procedure really.

See also Figure 12, be used on the guiding device exiting surface, forming the sandblast processing procedure synoptic diagram of uneven surface for the present invention.Among the present invention; Be formed at the uneven surface or the cloudy surface of the exiting surface of guiding device; Just be formed at the uneven surface or the cloudy surface of optical waveguide layer upper surface, its coarse degree can be controlled apart from d with roller surface 33 through blasting pressure p, sandblast speed v and the nozzle 32 of control sand blasting unit 31.Afterwards again with roller surface 33 with predetermined uneven surface as roller R1, R2, R3 shown in Figure 11; Roll extrusion should be given as security the plastic plate of synthetic shape in extrusion processing procedure altogether, and then at the present invention's extrusion uneven surface on reflecting surface and/or the exiting surface of the guiding device of the one-body molded three-decker of extrusion altogether.And the degree of roughness of this uneven surface will influence guiding device exiting surface and the homogeneity of Electrostatic Absorption degree between the blooming piece and leaded light ability among the present invention, for example shown in the following table two:

Table 2

In the table 2,, the exiting surface of guiding device and the Electrostatic Absorption phenomenon between the blooming piece are become seriously and easily with its scratch as the roughness Ra of formed uneven surface on the exiting surface of the guiding device among the present invention during less than 0.46 μ m.When Ra can increase the taking-up efficient of light during greater than 2.21 μ m, the anxiety of the outgoing light homogeneity decline that causes guiding device is arranged, and when Ra its bright dipping quality even have can't be through the anxiety of QC during greater than 6 μ m.Therefore, in the present invention, can the roughness of formed uneven surface on the guiding device exiting surface be controlled between the 0.07 μ m-2.52 μ m, especially being preferable between 0.46 μ m to the 2.21 μ m, and between 1 μ m to the 2.21 μ m for better.

In the present invention; The own plastic basis material in optical waveguide layer and reflection horizon all can be selected from known plastics at present; Such as, but be not limited to: acryl (polymethylmethacrylate; Abbreviation PMMA), polycarbonate (polycarbonate is called for short PC), polyethylene terephthalate (polyethylene terephthalate is called for short PET), MS or the like.The diffusion particle that is added in the optical waveguide layer also can be selected from known material at present, such as, but be not limited to: PMMA particulate, PC particulate, PET particulate, MS particulate etc.Reflective particle also can be selected from known material at present, such as, but be not limited to: SiO ₂Particulate, TiO ₂Particulate etc.

For the guiding device among the present invention; Except having as aforesaidly promoting light utilization efficiency, reduce optical loss, need not to re-use extra reflector plate and brightness enhancement film (BEF), can simplify the module framework and reduce module cost backlight and alleviate the advantages such as Electrostatic Absorption phenomenon of blooming piece with microstructure design because of extrusion altogether is one-body molded, the lifting of its optical performance at leaded light (for example light-emitting uniformity, briliancy and taste etc.) also is important considerations.

See also Figure 13-A and 13-B, an embodiment who is respectively guiding device of the present invention with and at the corresponding curve map between the angle of the light type of test exiting surface and the luminance brightness; The X axle of this curve map is that its scope of rising angle value of the light type of exiting surface is that 0 degree to 90 degree and Y axle are brightness values.The structure of the guiding device 1b that proposes with the present invention shown in Figure 13-A is an example; This guiding device 1b is for being total to the integrated three layers of flat platy structure of extrusion, and it comprises the equal photosphere 13b that is positioned at the upper strata, the reflection horizon 11b that is positioned at the optical waveguide layer 12b in middle layer and is positioned at lower floor and is added with reflective particle.Beside at the optical waveguide layer 12b of guiding device 1b is an incidence surface 15, is provided with a sidelight source 2 (can be CCFL or LED) in order to produce a light 20 in that incidence surface 15 is other, and this light 20 incides among the optical waveguide layer 12b of guiding device 1b via this incidence surface 15.At optical waveguide layer 12b and the adjacent surface (the just bottom surface of optical waveguide layer 12b or the end face of reflection horizon 11b) of reflection horizon 11b is a reflecting surface 112b, and all photosphere 13b is an exiting surface 132b away from the surface (end face of equal photosphere 13b just) of reflection horizon 11b one side.In optical waveguide layer and equal photospheres, can add but also can not add diffusion particle; And when the material of optical waveguide layer and equal plastics of photosphere own (contain in it added diffusion particle) is all identical, then guiding device 1b will be equivalent to only have the integrated double-decker of common extrusion in optical waveguide layer and reflection horizon in fact.And the embodiment of the guiding device 1b that the present invention shown in Figure 13-A proposes is to be all example with optical waveguide layer mutually with the material of the equal plastics of photosphere (containing the diffusion particle that is added in it) own.In the present embodiment, this incidence surface 15 is vertical each other with exiting surface 121b.Definable is perpendicular to the normal N of this exiting surface 121b on arbitrary location point of this exiting surface 121b.Because the characteristic of reflection horizon 11b, when making light 20 at the inner deviation downwards of optical waveguide layer 12b at directive reflecting surface 112b, the reflecting surface 112b that light 20 will be had a microstructure reflects 203 and the optical waveguide layer 12b and change angle of turning back.Yet, the light 20 of advancing in optical waveguide layer 12b inside when directive exiting surface 132b, can be because of the angle theta size between the normal N of the direct of travel of this light 20 and this exiting surface 132b different, and reflection 201 or 202 two kinds of different optical effects of bright dipping are arranged.As for, decision light 20 can then be that optical waveguide layer decides with the refractive index n of the equal plastics of photosphere own and the anaclasis critical angle θ c between the outside air in one of exiting surface place reflection or factor of bright dipping actually.Wherein, critical angle

In the present embodiment, be example with refractive index n=1.58 of optical waveguide layer (with equal photospheres), with n=1.58 substitution following formula, then can calculate critical angle θ _c=39.26 ° (approximating 40 °).In another embodiment, refractive index n=1.49 of (with equal photospheres) o'clock if optical waveguide layer then can calculate critical angle θ _c=42.16 ° (approximating 42 °).When the light 20 of directive exiting surface 132b and the angle theta between the normal N less than this critical angle θ _cThe time, this light 20 will bright dipping 202, and reflects away from this exiting surface 132b; And work as this angle theta greater than this critical angle θ _cThe time, this light 20 will be reflected among 201 times optical waveguide layer 12b.

The corresponding curve map between angle and the luminance brightness of light type of its exiting surface can tested and draw to the structure of guiding device 1b one embodiment that proposes according to the present invention shown in Figure 13-A.Shown in Figure 13-B, test and draw the corresponding curve map between angle and the luminance brightness of light type of its exiting surface with two-level architecture (that is only having optical waveguide layer) and two kinds of guiding devices of three-tier architecture (having different plastic materials equal photosphere, optical waveguide layer and reflection horizon that just different refractivity was constituted) respectively with the reflection horizon or when equal photosphere is identical with the optical waveguide layer plastic material.Can know by the curve shown in Figure 13-B; Two-level architecture and the curve that does not have a guiding device embodiment of special even light design obviously are the right side skew of the vertical normal of 0 degree towards rising angle; Be presented under the situation of the equal photosphere that lacks different refractivity, can be spent to the inclination of 50 degrees angular field of view about 30 by the light of exiting surface institute outgoing has high-high brightness; Relatively, brightness is lower on the contrary being suitable for 0 degree visual angle that human eye watches.Yet; For suitable reflecting surface microstructure depth-to-width ratio and suitable equal photosphere and the refractive index of optical waveguide layer and the curve of the three-tier architecture guiding device embodiment that thickness ratio designs are arranged; Its light by the outgoing of exiting surface institute is then obviously led toward positive visual angle; Make exiting surface high-high brightness arranged, thereby can increase the brightness of module backlight in the angular field of view at positive and negative 20 degree angles.

According to aforesaid light transmittance efficiency assessment mode; Come multiple reflecting surface with different breadth depth microstructure, different equal photosphere refractive index and optical waveguide layer refractive index and equal photosphere and optical waveguide layer with different-thickness ratio; Carry out cross match; And come to simulate one by one and measure the luminance brightness of its exiting surface according to the mode shown in Figure 13-A and Figure 13-B one by one, and the result is put in order like following table 3.

Wherein, the measurement mode of aforesaid exiting surface luminance brightness sees also Figure 14 measures the exiting surface 132 of guiding device 1 for the present invention the embodiment synoptic diagram of luminance brightness.Shown in figure 14, in exiting surface 132 scopes that the top view direction is shown, choose totally 13 test sections that are positioned at diverse location.Inject in the guiding device through sending light in a sidelight source 2 of the guiding device 1 of different structure designs; Get its mean value after totally 13 its positive visual angle luminance brightness of test sections measurement at the exiting surface 132 of this guiding device 1 again, and this mean value is inserted in the table 3 as measured luminance brightness.

Table 3

In table 3, the value in " structure depth-to-width ratio " field refers to the depth H 2 of the microstructure on the reflecting surface (reflection horizon upper surface just) of guiding device and the ratio of width P2; Value in " n1 " field is the refractive index value of equal photosphere; Value in " n2 " field is the refractive index value of optical waveguide layer; Value in " t1 " field is the one-tenth-value thickness 1/10 of equal photosphere; Value in " t2 " field is the one-tenth-value thickness 1/10 of optical waveguide layer; Value in " t1/t2 " field is the ratio of equal photosphere and optical waveguide layer thickness; Value in " luminance brightness " field is to measure the exiting surface that the obtains mean value of the luminance brightness in totally 13 zones according to embodiment shown in Figure 14.

Luminance brightness by sequence number in the table three 11 to sequence number 64 embodiment are measured can be known compared to the luminance brightness of other embodiment; When reflecting surface depth-to-width ratio (H2/P2) value can have preferable luminance brightness when (that is, 0.233 H2/P2 0.419) between 0.233 to 0.419; And the luminance brightness of the embodiment of n1＜n2 is also come well than the embodiment of n2＞n1.In addition; By the 78 embodiment measurements of sequence number in the table three 23 to sequence number to luminance brightness can know; When the value of the depth-to-width ratio of reflecting surface 0.2 between 0.319 the time, having suitably all, the guiding device of photosphere and optical waveguide layer thickness ratio scope interior three-tier architecture for

can have the higher luminance brightness of guiding device (optical waveguide layer thickness 0) compared to two-tier system; And, the luminance brightness of the guiding device of three-tier architecture even can more exceed 67% (for example, coming comparison) than the luminance brightness of the guiding device of two-tier system with sequence number 54 and the brightness values of 56 liang of embodiment of sequence number.In addition, at the curve of the three-tier architecture guiding device embodiment shown in Figure 13-B, then be the curve of simulating gained according to the three-tier architecture of sequence number 42 embodiment, the luminance brightness of its exiting surface can be up to 5755nits.

See also Figure 15-A, 15-B and 15-C, the reflecting surface depth-to-width ratio

that is respectively in the guiding device that the present invention's proposition is described is implemented illustration for the difference of light reflecting effect.

Shown in Figure 15-A; When the depth-to-width ratio

of reflecting surface 112c too hour; After the microstructure reflection of light 20c via the reflecting surface 112c of reflection horizon 11c; Can make light toward direction deviation with great visual angle; Depart from positive visual angle; Make that the measured luminance brightness of exiting surface 132c is lower; So it is 0.134 preferable that the scope of

is not below or equal to, and just should meet following mathematical expression:

Shown in Figure 15-B because when the refractive index n 1 of equal photosphere 13d during less than the refractive index n 2 of optical waveguide layer 12d, for example and during n2=1.58 as n1=1.49, will have as shown in the formula the result:

Its result does; Light via reflection horizon 11d structure correcting after directly outgoing to exiting surface 132d and bright dipping; Can be in all photosphere 13d and optical waveguide layer 12d interface generation total reflections; Cause that light transmits once more, the energy of loss light in optical waveguide layer 12d, so can obtain the luminance brightness of higher exiting surface 132d.

Shown in Figure 15-C; When the depth-to-width ratio of reflecting surface 112e is too big; After the microstructure reflection of light 20e via the reflecting surface 112e of reflection horizon 11e; Can make light 20e toward the direction deviation of incidence surface 15 sides; Depart from positive visual angle; Make luminance brightness lower, thus the scope of

be not more than equal 0.5 o'clock preferable, just should meet following mathematical expression:

Comprehensive above-mentioned mathematical expression can learn, when the reflecting surface microstructure of the guiding device that proposes as the present invention meets following mathematical expression, can obtain higher exiting surface luminance brightness:

Wherein, the value of P2 is preferable between 80 μ m to 250 μ m, if it is less than 80 μ m, then utilize the ratio of briquetting of roller extrusion microstructure to reduce in the extrusion processing procedure altogether, if it greater than 250 μ m, then is prone to have the bright line phenomenon at exiting surface.

This shows that the present invention has the following advantages:

(1) one side increases microstructure and one deck reflection horizon to the guiding device that proposes of the present invention in the bottom of optical waveguide layer, and guiding device forms simultaneously therewith, makes no air interface layer between reflection horizon and optical waveguide layer in this guiding device.Owing to do not have air layer between reflection horizon of the present invention and the optical waveguide layer sheet material; With the prior art that the airspace is arranged in comparison; Guiding device of the present invention can not need water chestnut mirror module can promote light utilization efficiency, and its microstructure also can be used for the reflection and the light diffusion phenomena of optical waveguide layer, reaches the effect of reflection and leaded light simultaneously; Can effectively reduce below the optical loss to 4%, make that bright dipping is more even, more blast of briliancy.Simultaneously, because the processing procedure of the guiding device among the present invention is through simplifying, so can reduce guiding device pad pasting program, module group procedure program backlight and cost.

But only above-described embodiment shall not be applied to restriction range of application of the present invention, and protection scope of the present invention should be main with the scope that claim content institute's definition techniques spirit of the present invention and impartial variation thereof are included.The equalization of promptly doing according to claim of the present invention generally changes and modifies, and will not lose main idea of the present invention place, does not also break away from the spirit and scope of the present invention, and the former capital should be regarded as further enforcement situation of the present invention.

Claims (10)

1. use in guiding device, this guiding device sidelight source of can arranging in pairs or groups; This guiding device comprises:

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from this incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer; And

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface;

It is characterized in that:

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid.

2. guiding device according to claim 1; It is characterized in that the depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression: and n1＜n2; Wherein, H2 is the degree of depth of the microstructure of said reflecting surface, and P2 is the width of the microstructure of said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

3. guiding device according to claim 2 is characterized in that, the depth-to-width ratio of the microstructure on the said reflecting surface meets one of following at least condition:

Condition one: $0.233\&le;\frac{H2}{P2}\&le;0.419;$

The value of condition two: P2 is between 80 μ m to 250 μ m;

Condition three: the value of the depth-to-width ratio of said microstructure

is between 0.2 to 0.319, and the scope of the ratio of the thickness t 2 of the thickness t 1 of said equal photosphere and optical waveguide layer is

Condition four: said microstructure is discrete microstructure, and between adjacent two microstructures apart from the value of G between between the 0mm to 1.4mm.

4. guiding device according to claim 2 is characterized in that, said guiding device also comprise following at least one of them:

A plurality of diffusion particles are arranged in said optical waveguide layer;

A plurality of diffusion particles are arranged in said equal photosphere;

The microstructure of a solid that on said exiting surface, is provided with;

Two kinds of plastics of different refractivity are blended in the said reflection horizon;

A plurality of reflective particles are arranged in said reflection horizon; And

A uneven surface or a cloudy surface that may command density changes are positioned on the said exiting surface.

5. guiding device according to claim 4 is characterized in that,

When said a plurality of diffusion particle is arranged in the said optical waveguide layer; The value of the poor Δ n1 of the refractive index of the diffusion particle in the said optical waveguide layer and the plastic basis material of said optical waveguide layer itself satisfies 0.04＜Δ n1＜0.1; The particle diameter of the diffusion particle in the said optical waveguide layer is between 2 μ m and 10 μ m, and the refractive index of the plastic basis material of said optical waveguide layer itself is between 1.42 and 1.63;

When said a plurality of diffusion particle is arranged in the said equal photosphere; The poor Δ n2 value satisfied 0.04＜Δ n2 of system＜0.1 of the refractive index of the diffusion particle in the said equal photosphere and the plastic basis material of said equal photosphere itself; The particle diameter of the diffusion particle in the said equal photosphere is between 2 μ m-10 μ m, and the refractive index of the plastic basis material of said equal photosphere itself is between 1.42 and 1.63;

When being mixed with the plastics of two kinds of different refractivities in the said reflection horizon, the blending ratio of two kinds of plastics of said different refractivity is 7: 3;

When in the said reflection horizon a plurality of reflective particle being arranged; The refractive index of said reflective particle is between 2.2-3.2; And the percentage by weight of said reflective particle is less than 0.5%; And the particle diameter of said reflective particle is between 4 μ m and 50 μ m, and the refractive index of the plastic basis material in said reflection horizon itself is between 1.6 and 2.5, and the difference of the refractive index of said reflection horizon and said optical waveguide layer is between 0.05 and 1; And

When having said uneven surface on the said exiting surface, the value of the roughness Ra of said exiting surface satisfies 1 μ m＜Ra＜6 μ m.

6. guiding device according to claim 4 is characterized in that, when having said uneven surface on the said exiting surface, the value of the roughness Ra of said exiting surface satisfies 1 μ m＜Ra＜2.21 μ m.

7. guiding device according to claim 2; It is characterized in that; Said exiting surface is provided with the microstructure of a solid, and the orientation of the orientation of the microstructure on said exiting surface and the microstructure of said reflecting surface is parallel to each other or is mutually orthogonal.

8. guiding device according to claim 7 is characterized in that, the microstructure on microstructure on the said exiting surface and said reflecting surface be following one of them:

Microstructure with most long and narrow and continuity triangle strips of being arranged in parallel;

Microstructure with most long and narrow and continuity semicircle strips of being arranged in parallel;

Have the microstructure of majority with the continuity taper of the solid of arrayed;

Has majority with the spherical microstructure of the continuity of the solid of arrayed;

Have the microstructure of majority with the continuity arcuation taper of the solid of arrayed;

Have most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Has the microstructure that most long and narrow and three-dimensional triangle strips of noncontinuity that be arranged in parallel, equidistance density change;

Have most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Has the microstructure that most long and narrow and three-dimensional semicircle strips of noncontinuity that be arranged in parallel, equidistance density change;

Have most with the three-dimensional taper of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Have most long and narrow and microstructures that change with the three-dimensional taper of the noncontinuity of arrayed, equidistance density;

Have most with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place;

Have most microstructures that change with the three-dimensional spherical microstructure of the noncontinuity of arrayed, equidistance density;

Have most with the noncontinuity arcuation taper microstructure of arrayed, equidistance and two side direction do not become the microstructure that intensive may command density changes away from the incidence surface place; And,

Microstructure with most noncontinuity arcuation taper microstructures, the variation of equidistance density with arrayed.

9. module backlight with guiding device, this module backlight comprises:

One sidelight source;

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from said incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer;

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface; And

At least one blooming is covered on the said exiting surface;

It is characterized in that,

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid; And,

The depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression:

And n1＜n2;

Wherein, H2 is the degree of depth of the microstructure on the said reflecting surface, and P2 is the width of the microstructure on the said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

10. LCD with guiding device, this LCD comprises:

One sidelight source;

One optical waveguide layer, its corresponding incidence surface; The light that this incidence surface can supply said sidelight source to be sent gets into this optical waveguide layer from this incidence surface;

One reflection horizon can be reflected the light in this reflection horizon of directive from said optical waveguide layer, makes it return said optical waveguide layer;

One equal photosphere, it is an exiting surface away from the surface of said reflection horizon one side; Wherein,

Said optical waveguide layer is between said reflection horizon and said equal photosphere, and said exiting surface is vertical with said incidence surface, can make the light in the said optical waveguide layer have at least a part to penetrate from said exiting surface;

At least one blooming is covered on the said exiting surface; And

One liquid crystal panel is positioned at said blooming than the side away from said optical waveguide layer;

It is characterized in that,

Said reflection horizon, said optical waveguide layer and said equal photosphere three do not have air interface for extrusion is one-body molded altogether between said reflection horizon and the said optical waveguide layer; And, between said optical waveguide layer and said reflection horizon, a reflecting surface is arranged, and said reflecting surface is provided with the microstructure of a solid; And,

The depth-to-width ratio of the microstructure on the said reflecting surface

meets following relational expression:

And n1＜n2;

Wherein, H2 is the degree of depth of the microstructure on the said reflecting surface, and P2 is the width of the microstructure on the said reflecting surface, and n1 is the refractive index of said equal photosphere, and n2 is the refractive index of said optical waveguide layer.

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