CN102401929A - Light guide plate and face light source device - Google Patents
Light guide plate and face light source device Download PDFInfo
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- CN102401929A CN102401929A CN2011102713014A CN201110271301A CN102401929A CN 102401929 A CN102401929 A CN 102401929A CN 2011102713014 A CN2011102713014 A CN 2011102713014A CN 201110271301 A CN201110271301 A CN 201110271301A CN 102401929 A CN102401929 A CN 102401929A
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- light
- lgp
- interarea
- plane
- light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Abstract
The invention provides a light guide plate which can alleviate light incidence unevenness adjacent to a light source. The light guide plate comprises a basal body having a first main face, a second main face and multiple side surface; a first optical element equipped on the first main face and extending in a way to be orthogonal to the first side surface of the basal body; and a second optical element configured on the whole range except the light incidence area of the second main face in a mutually dispersed way. A second optical element section perpendicular to the first side surface comprises a first inclined face directed towards a normal line inside the basal body and orthogonal to the first side surface and a second inclined face opposed to the first inclined face. A plane having the normal line of the first inclined face and the normal line of the second main face and the first side surface are at an angle ranging from 80 degrees to 100 degrees. So are the planes having the normal line of the second inclined face and the normal line of the second main face and the first side surface. A section cut parallel to the first side surface comprises opposed inclined side surfaces the projection areas of which on the second main face range from 0.0001 mm2 to 0.023 mm2.
Description
Technical field
The present invention relates to the LGP and the planar light source device that liquid crystal display cells etc. are shone from the back side.
Background technology
Liquid crystal display cells self is not luminous.Therefore, for display image, need penetrate the planar light source device of illumination light to the back side of liquid crystal display cells.Planar light source device possesses the light from light source incident is carried out leaded light and from the LGP of exiting surface outgoing.
Planar light source device requires not exist and shows irregular and high brightness, high efficiency performance.Assemble efficiently in the display part of liquid crystal display cells in order to make emergent light; And proposed to make the uneven scheme of distribution density at the optical element of the lower surface configuration of LGP; And proposed using under the situation of linear light source the scheme (with reference to patent documentation 1) that the length direction of diffusion patterned element and linear light source is disposed abreast.In addition, proposed on the exiting surface of LGP, to use the scheme (with reference to patent documentation 2,3 and 4) of the downward prismatic lens and the prismatic lens that makes progress.
Under the situation of the existing planar light source device that uses downward prismatic lens, possess light source, LGP, reflection part, downward prismatic lens and diffusion sheet.The light-emitting area of LGP and light source relatively disposes.Reflection part is in the lower surface configuration of LGP.Prismatic lens is in the upper surface configuration of LGP downwards.Diffusion sheet is disposing on the prismatic lens downwards.
Light source uses a plurality of light emitting diodes pointolites such as (LED).In LGP, a side that relatively disposes with light source is an incidence surface, with an interarea of incidence surface quadrature be exiting surface, another interarea is a reflecting surface.Be provided with upwardly extending optics groove at reflecting surface in the side parallel with incidence surface.For the homogenising of illumination light, also can on exiting surface, dispose with the upwardly extending trickle a plurality of optics grooves in the side of incidence surface quadrature.
The light that penetrates from light source is imported in the LGP from incidence surface.Light is reflected by the optics groove of reflecting surface in LGP repeatedly, shines outside the LGP through exiting surface when above becoming critical angle.Shine the outer light of LGP by of the normal direction deflection of downward prismatic lens, radiate through diffusion sheet again to exiting surface.Diffusion sheet is to prevent to be provided with the interference stripes of liquid crystal display cells.Under the situation that interference stripes do not take place, also diffusion sheet can be set.
On the other hand, using under the situation of the existing planar light source device of prismatic lens upwards, possessing light source, LGP, reflection part, diffusion sheet, one to two upwards prismatic lens.The light-emitting area of LGP and light source relatively disposes.Reflection part is in the lower surface configuration of LGP.Diffusion sheet is in the upper surface configuration of LGP.One to two upwards prismatic lens disposes on diffusion sheet.
Light source uses a plurality of light emitting diodes pointolites such as (LED).In LGP, a side that relatively disposes with light source is an incidence surface, with an interarea of incidence surface quadrature be exiting surface, another interarea is a reflecting surface.Be provided with upwardly extending optics groove at reflecting surface in the side parallel with incidence surface.For the homogenising of illumination light, also can on exiting surface, be configured in upwardly extending trickle a plurality of optics grooves with the side of incidence surface quadrature.
The light that penetrates from light source is imported in the LGP from incidence surface.Light is reflected by the optics groove of reflecting surface in LGP repeatedly, shines outside the LGP through exiting surface when above becoming critical angle.
In order to make the brightness in the exiting surface even, inject to the outer light of LGP and spread by diffusion sheet, radiate through the prismatic lens that makes progress again.One to two upwards prismatic lens is in order to be improved positive brightness and to be disposed by light meeting coalescence on the normal direction of exiting surface of diffusion sheet diffusion.Though upwards prismatic lens is configurable one, thus through with the crest line of prism substantially the mode of quadrature dispose two overlappingly and can improve light gathering efficiency and further improve front face brightness, two of therefore main configurations are prismatic lenses upwards.
In the planar light source device that these have proposed, through realizing high brightness, high-level efficiency from the strong light of LGP outgoing directive property.Therefore, the diffusion of the light in the LGP dies down, and near incidence surface, produces highlights in each of the light in part relative with a plurality of light sources, and a plurality of light source between relative light in part produce dark portion, and it is irregular near light in part, to produce light inlet such as strong bright line.
Irregular for improving light inlet, proposed to make light from the lower surface reflection of LGP and be utilized in optics groove that the reflecting surface of reflection part forms once more to the method (with reference to patent documentation 5) of LGP reflection.The optics groove of reflection part setting use with the incidence surface of LGP near corresponding zone make the shape of light diffusion that kind.
In addition, irregular for improving light inlet, and the incidence surface that is employed in LGP makes the light diffusion so that light even method of incident in LGP.Perhaps, also can make the light diffusion, make light from exiting surface outgoing equably at the exiting surface of LGP.Under this situation, dispose asperities pattern and lens pattern through processing such as inject process at incidence surface or exiting surface.Being utilized in method that incidence surface makes light diffusion, can to improve light inlet irregular.
But, in recent years,, the tendency of the distance of the effective light-emitting zone (viewing area of liquid crystal display cells) of shortening from the incidence surface relative with a plurality of light sources to planar light source device is arranged along with the miniaturization of planar light source device, becoming, it is irregular to be easy to that light inlet takes place.Therefore, in existing method, it is irregular to substantially improve light inlet.
Patent documentation 1: the spy opens flat 11-231797 communique
Patent documentation 2: the spy opens the 2005-142078 communique
Patent documentation 3: the spy opens the 2008-218418 communique
Patent documentation 4: the spy opens the 2006-208869 communique
Patent documentation 5: International Publication the 05/061957th trumpeter's volume
Summary of the invention
The purpose of this invention is to provide near irregular LGP and the planar light source device of light inlet the light source that accompanies of miniaturization that can reduce with device.
For realizing above-mentioned purpose, the LGP of first scheme of the present invention is characterized in that: possess: matrix, a plurality of sides that have first and second interareas relative to each other and surround first and second interareas; A plurality of first optical elements, be configured on first interarea and with the direction of the first side quadrature of matrix on extend; And a plurality of second optical elements; Entire scope outside near removing of second interarea is positioned at first side the light inlet zone is configuration mutually with leaving; With regard to each of a plurality of second optical elements; With first lateral vertical have in the section cut open towards the normal of the inside of matrix and first inclined-plane that intersects first side and second inclined-plane relative with first inclined-plane; Plane and each plane and the first side angulation on plane of normal that comprises normal and second interarea on second inclined-plane of normal that comprises normal and second interarea on first inclined-plane is the scope of 90 degree ± 10 degree; With first parallel sided have inclined side relative to each other in the section cut open, projection in each area of said second interarea than 0.0001mm
2Big and not enough 0.023mm
2Scope.
Alternative plan of the present invention is a kind of planar light source device, and the irradiating liquid crystal display element is characterized in that: possess: LGP is the described LGP of above-mentioned first scheme; Light source relatively disposes first side as incidence surface and with incidence surface; Reflection part is in the face of the reflecting surface ground of said LGP disposes and will be from the light of reflecting surface incident to said LGP internal reflection; With the optically focused parts, be configured to assemble from the ground, the direction of propagation of the light of exiting surface incident in the face of the exiting surface and the control of the opposition side of reflecting surface.
According to the present invention, near irregular LGP and the planar light source device of light inlet the light source that accompanies of miniaturization that can reduce with device can be provided.
Description of drawings
Fig. 1 is the side-looking synoptic diagram of an instance of the planar light source device of the downward prismatic lens of use that relates to of expression embodiment of the present invention.
Fig. 2 is the make progress side-looking synoptic diagram of other instances of planar light source device of prismatic lens of the use that relates to of expression embodiment of the present invention.
Fig. 3 be the LGP that relates to of expression embodiment of the present invention an instance overlook synoptic diagram.
Fig. 4 is the synoptic diagram of an instance of the upper surface of expression LGP shown in Figure 3.
Fig. 5 is the synoptic diagram of an instance of the A-A section of expression LGP shown in Figure 4.
Fig. 6 is the figure of an instance of the lower surface of expression LGP shown in Figure 3.
Fig. 7 be second optical element that relates to of expression embodiment of the present invention an instance overlook synoptic diagram.
Fig. 8 is the synoptic diagram of an instance of the B-B section of expression LGP shown in Figure 7.
Fig. 9 is the synoptic diagram of an instance of the C-C section of expression LGP shown in Figure 7.
Figure 10 is the side-looking synoptic diagram of other instances of the planar light source device that relates to of expression embodiment of the present invention.
Figure 11 is the side-looking synoptic diagram of other instances of the planar light source device that relates to of expression embodiment of the present invention.
Among the figure:
The 1-light source, 3-LGP, 4-matrix, 5,6, the 6a-prismatic lens, 7-reflection part; 8-optically focused parts, 9-diffusion sheet, 10-incidence surface (first side), 12-first interarea, 14-second interarea; 16-first optical element, 18-second optical element, 22-first inclined-plane, 24-second inclined-plane, 25-inclined side; 26,27,27a-prism row, 28-diffusion sheet, 30-light-emitting zone, 32-light inlet zone, 34-viewing area.
Embodiment
Secondly, with reference to accompanying drawing embodiment of the present invention is described.In the record of following accompanying drawing, identical or similar part is marked with identical or similar mark.But, it should be noted that accompanying drawing is that schematically the relation between thickness and the planar dimension, the ratio of each layer thickness etc. are different with actual conditions.Therefore, concrete thickness and size should be judged with reference to following explanation.In addition, size relationship and the ratio different portions between accompanying drawing also comprises mutually each other certainly.
Have again, below shown in the embodiment illustration be used for apparatus and method that technological thought of the present invention is specialized, technological thought of the present invention can carry out various variations in the scope of asking for protection.
The LGP 3 that embodiment of the present invention relates to can be used for using the planar light source device of downward prismatic lens 5 shown in Figure 1 and uses two the upwards planar light source device of prismatic lens 6,6a shown in Figure 2.LGP 3 possesses: matrix 4; A plurality of first optical elements 16 that on first interarea 12 of matrix 4, are provided with; And a plurality of second optical elements 18 that on second interarea 14 relative, are provided with first interarea.
The structure of LGP 3 is general in planar light source device illustrated in figures 1 and 2, like Fig. 3, Fig. 4 and shown in Figure 6, uses the matrix 4 of general rectangular shape.A side in four sides of first and second interareas 12,14 that surround matrix 4 is made as first side, the side of the first side thereof opposite side is made as second side.Have again, when being used for planar light source device, with first side as incidence surface 10.In following explanation, use the matrix 4 of rectangular shape to explain to LGP 3, but the shape of matrix 4 is unqualified.For example, as matrix 4, can use the above polygon of quadrilateral.In addition, can be with the polygonal a plurality of sides that are used for matrix 4 as incidence surface.Below, use Fig. 1 or planar light source device shown in Figure 2 that the action of LGP 3 is described.
As depicted in figs. 1 and 2, the planar light source device that embodiment of the present invention relates to possesses light source 1, LGP 3, optically focused parts 8 and reflection part 7 etc.The zone of LGP 3 that will be corresponding with the liquid crystal display cells that is shone by planar light source device (omitting diagram) is as viewing area 34.With the interior zone of LGP 3 that is surrounded by viewing area 34 and disposes second optical element as light-emitting zone 30, will from incidence surface 10 to from the zone of the end of incidence surface 10 sides of the second nearest optical element 18 of incidence surface 10 sides of light-emitting zone 30 in other words near the zone first side as light inlet zone 32.That is, viewing area 34 is effective light-emitting zones, is configured in than in the little scope of light-emitting zone 30.
As shown in Figure 1, optically focused parts 8 possess downward prismatic lens 5 and diffusion sheet 9.Optically focused parts 8 are configured to the interarea of a plurality of prism row 26 of being arranged with of downward prismatic lens 5 in the face of first interarea 12.It is relative with LGP 3 that diffusion sheet 9 is configured to the downward prismatic lens of clamping 5.
Perhaps, as shown in Figure 2, optically focused parts 8 possess diffusion sheet 28, prismatic lens 6,6a make progress.Optically focused parts 8 are configured to first interarea 12 that diffusion sheet 28 is faced as the exiting surface of LGP 3.Upwards prismatic lens 6 is configured to and to dispose other relative interarea clamping diffusion sheets 28 of the interarea of a plurality of prism row 27 relative with LGP 3.Upwards prismatic lens 6a is configured to and to dispose other relative interarea clamping prismatic lenses 6 of the interarea of a plurality of prism row 27a relative with diffusion sheet 28.Upwards prismatic lens 6,6a are configured to the mutual quadrature substantially of crest line of prism row 27 and prism row 27a.Have again, can omit upwards prismatic lens 6a and become and use a upwards structure of prismatic lens 6.
With the incidence surface 10 of LGP 3 relatively dispose a plurality of pointolites for example three LED be used as light source 1, the light that penetrates from light source 1 imports in the LGP 3 through incidence surface 10.The light that in LGP 3, carries out waveguide is reflected in LGP 3 by first inclined-plane 22 of second optical element 18 of second interarea 14 repeatedly.
For example, as shown in Figure 1, first interarea 12 become more than the critical angle light through as first interarea 12 of exiting surface towards prismatic lens 5 outgoing down.The light that becomes more than the critical angle at second interarea 14 passes through 7 outgoing of second interarea, 14 orientating reflex parts.Import once more in the LGP 3 by reflection part 7 reflections and through second interarea 14 from the light of second interarea, 14 outgoing, through first interarea 12 towards downward prismatic lens 5 outgoing., radiate through diffusion sheet 9 again by of the normal direction deflection of downward prismatic lens 5 from the light of first interarea, 12 outgoing to first interarea 12.Diffusion sheet 9 disposes with the interference stripes of liquid crystal display cells for preventing.Under the situation that interference stripes do not take place, can not establish diffusion sheet 9.
Perhaps, as shown in Figure 2, the light through first interarea 12 outgoing outside LGP 3 is in order to make brightness in the face evenly and by diffusion sheet 28 diffusions, again through upwards prismatic lens 6,6a radiate.Upwards prismatic lens 6,6a for will being disposed on the normal direction of first interarea 12 by the light of diffusion sheet 28 diffusions in the positive brightness of coalescence raising.Though can use a upwards prismatic lens 6, preferably upwards prismatic lens 6,6a are configured with the mode of the crest line cardinal principle quadrature of each prism row overlappingly with two.Through using two upwards prismatic lens 6,6a, can improve light gathering efficiency, further improve front face brightness.
As the matrix 4 of LGP 3, use polymethylmethacrylate (PMMA), polycarbonate (PC), cyclic olefin polymer (COP), cycloolefin analog copolymer transparent thermoplastics such as (COC).First optical element 16 of LGP 3 and second optical element 18 are formed on the matrix 4 through injection moulding method etc.
On the incidence surface 10 of LGP 3, be provided with and make anisotropy (different side) the diffuse optical pattern of expanding with respect to the direction of direct of travel cardinal principle quadrature from the light of light source 1 outgoing (omitting diagram).Patterns such as anisotropy diffuse optical pattern setting precedent such as wavy, circular-arc, V font extend on the thickness direction of LGP 3.Especially, the diffusivity of waveform patterns is strong, can suppress the generation of bright line, and is therefore more satisfactory.
Like Fig. 3 and shown in Figure 4, on first interarea 12 of matrix 4, be provided with upwardly extending a plurality of first optical elements 16 in the side of incidence surface 10 quadratures.A plurality of first optical elements 16 are in the setting on the whole of first interarea 12.As shown in Figure 5, the section shape that cuts off abreast with incidence surface 10 of each first optical element 16 is the isosceles triangles with vertex angle theta.Scopes bigger than 80 degree, less than 150 degree that vertex angle theta is preferably.In addition, a plurality of first optical elements 16 comprise that the isosceles triangle that is preferably the different a plurality of drift angles more than three more than two in the scope with and less than 150 degree bigger than 80 degree is more satisfactory.
First optical element 16 has to be made in the light of the internal communication of LGP 3 to the light that tilts with incidence surface 10 parallel directions near frontal (normal direction of exiting surface) and from the function of the light quantity of LGP 3 outgoing increasing frontal.Through making the scopes of vertex angle theta, thereby the light quantity of frontal can be increased efficiently, the LGP of high brightness can be realized at and less than 150 degree bigger than 80 degree.In addition, have first optical element 16 of the isosceles triangle of the different a plurality of vertex angle theta of section through use, thereby can adjust the light quantity of frontal, can become any light outgoing characteristic that weakens or strengthen directive property.
In addition, the height of a plurality of first optical elements 16 is more than the 5 μ m, more preferably more than the 6 μ m.Be limited to about 50 μ m on the height.
First optical element 16 can also be groove.Under this situation, the degree of depth less than 5 μ m of groove, easy generation is close to downward prismatic lens 5 that disposes in the face of first interarea 12 or diffusion sheet 28, display defect takes place easily, so be more than the 5 μ m, more preferably more than the 6 μ m.
Like Fig. 3 and shown in Figure 6, on second interarea 14 of matrix 4 and a plurality of second optical elements 18 are set with in the entire scope of light-emitting zone 30, leaving mutually.Like Fig. 7～shown in Figure 9; For each and every one of a plurality of second optical elements; The section shape that itself and incidence surface 10 are vertically cut open (section shape of cutting open with the B-B line of Fig. 7) is serrate, and has towards crossing first inclined-plane 22 of the normal of the inside of LGP 3 and incidence surface 10 and second inclined-plane 24 relative with first inclined-plane 22.That is, second inclined-plane 24 towards the normal of the inside of LGP 3 face towards the opposition side of incidence surface 10, do not intersect with incidence surface 10.In addition, the section shape that second optical element 18 itself and incidence surface 10 are cut open abreast (section shape of cutting open with the C-C line of Fig. 7) is trapezoidal, has inclined side 25 relative to each other.
First inclined-plane 22 is rectangular shapes, and the width W a of the direction parallel with incidence surface 10 is the scope below the 0.15mm.Second inclined-plane 24 is trapezoidal shapes, and the width W b on base is greatly the scope below the 0.3mm than Wa.Inclined side 25 is triangular shaped, and the width W c on base is the scope below the 0.3mm.If the width W a of second optical element 18, Wb, Wc surpass above-mentioned scope and become excessive, then when luminous, unfavorable condition takes place to show as bright spot and by visual identity in second optical element 18.
The direction of second optical element 18 is configured in plane and plane and the incidence surface 10 of normal of normal and second interarea 14 that comprise second inclined-plane 24 of normal of the normal that comprises first inclined-plane 22 and second interarea 14 substantially on the direction of right angle intersections.That is, a plurality of second optical elements 18 are towards the certain orientation of confirming substantially with respect to incidence surface 10.Like this, go up expansion, near irregular the reducing of light inlet the incidence surface 10 by the light of first inclined-plane, 22 reflections at Width (direction of configuration light source 1).In addition, the light quantity minimizing by 24 reflections of second inclined-plane has the effect of the decline of the light quantity that prevents frontal (towards the direction of liquid crystal indicator).Be used for direction outgoing by the light after 24 reflections of second inclined-plane in the brightness decline that makes frontal.Have, right angle orientation is meant the direction of fluctuation about the degree of permission ± 10 substantially again.
First inclined-plane 22 is preferably scope bigger than 0.5 degree and that less than 10 is spent with the normal angulation α of incidence surface 10, more preferably spends scopes big and less than 5 degree than 0.5.Second inclined-plane 24 is preferably scope bigger than 50 degree and that less than 89 is spent with the normal angulation β of incidence surface 10, more preferably spends scopes big and less than 89 degree than 70.
Following tendency is arranged: in angle [alpha] is that 10 degree are when above, in a large amount of light outgoing of incidence surface 10 sides, when less than 0.5 is spent, in a large amount of light outgoing of the face side relative with incidence surface.Therefore, luminous equably in order to make in the face for planar light source device, preferably making angle [alpha] is this scope.
With regard to angle beta, if less than 50 degree, then at the light of the faces reflection relative with incidence surface 10 by 24 reflections of second inclined-plane and outgoing outside LGP 3 on than the direction of the angle tilt of regulation.Therefore, from vergence direction sightingpiston light supply apparatus the time, the demonstration unfavorable condition of the bright part of part takes place to occur.In addition, be that then (getting ら れ) taken off in the angle part by mould when injection-molded moulding more than 89 degree if make angle beta, there is the tendency that produces shaping unfavorable conditions such as breach.
In addition, in the section of cutting open abreast with incidence surface 10, inclined side 25 is more satisfactory in the scopes of and less than 75 degree bigger than 40 degree with the line angulation γ with the normal quadrature of second interarea 14.Inclined side 25 has to be made in the light of the internal communication of LGP 3 to the light that tilts with incidence surface 10 parallel directions near frontal (normal direction of exiting surface) and from the function of the light quantity of LGP 3 outgoing increasing frontal.Through making angle γ be positioned at the scopes of and less than 75 degree bigger, thereby the light quantity of frontal can be increased efficiently, the LGP of high brightness can be realized than 40 degree.
Have, first inclined-plane 22 of this second optical element 18 and second inclined-plane 24, two inclined sides 25 are that minute surface is more satisfactory again.If each face is not a minute surface,, cause brightness to descend then in the diffusion of reflection time.
The size of each second optical element 18 is certain substantially.With second optical element 18 at the area of second interarea, 14 projections than 0.0001mm
2Big and not enough 0.023mm
2Scope in be important, more preferably than 0.0001mm
2Big and not enough 0.001mm
2Scope in.The not enough 0.001mm of area
2, the quantity of second optical element 8 increases, the expensive time of the process time of molding die.In addition, area is 0.023mm
2More than, second element 18 is excessive, and when luminous, second optical element 18 takes place to show bad as bright spot and by visual identity.Therefore, the area that makes second optical element 18 is than 0.001mm
2And not enough 0.023mm
2Scope in that to reduce light inlet necessary aspect when irregular.
A plurality of second optical elements 18 are configured to: to compare the end regions of incidence surface (or first side) 10 sides of light-emitting zone 30 many at the end regions as second side of the opposition side of the incidence surface (or first side) of light-emitting zone 30 for the number of second optical element 18 of per unit area or surface density in the light-emitting zone 30 of second interarea 14.Here, the surface density of second optical element 18 is defined as: with 14 projections of second interarea in incidence surface (or first side) 10 plane orthogonal the time, be 1mm with respect to projected area
2View field, the number percent of the projected area of second optical element 18 that view field is contained.In addition, the end that the end regions of incidence surface (or first side) 10 sides of light-emitting zone 30 is defined as incidence surface (or first side) 10 sides from light-emitting zone 30 to light-emitting zone 30 inner 1mm with interior zone.In addition, with the end regions of second side of light-emitting zone 30 be defined as end from second side of light-emitting zone 30 to light-emitting zone 30 inner 1mm with interior zone.In addition, with 14 projections of second interarea in incidence surface (or first side) 10 plane orthogonal in the time, in the end regions of incidence surface (or first side) 10 sides of light-emitting zone 30, be 1mm with projected area
2View field be defined as first view field, in the end regions of second side of light-emitting zone 30, be 1mm with projected area
2View field be defined as second view field.
In first view field in the end regions of incidence surface (or first side) 10 sides of light-emitting zone 30, the surface density of second optical element 18 is preferably more than 10% and the scope below 40%, more preferably 20% or more and 35% following scope.In the end regions of incidence surface (or first side) 10 sides of light-emitting zone 30, when the surface density less than 10% of second optical element 18, unfavorable condition takes place to show as bright spot and by visual identity in second optical element 18.If the surface density of second optical element 18 surpasses 40%,, so become inhomogeneous in the light-emitting zone 30 or as the emergent lights in the viewing area 34 of effective light-emitting zone then because at a lot of light of incidence surface 10 side outgoing.Because the projected area of second optical element 18 is positioned at above-mentioned scope, thus shorten along with the miniaturization of planar light source device from incidence surface to effective light-emitting zone apart from the time can find not have the surface density of the irregular second suitable optical element 18 of light inlet.
In second view field in the end regions of second side of light-emitting zone 30, the surface density of second optical element 18 is preferably more than 30% and the scope below 65%, more preferably 40% or more and 60% following scope.In the end regions of second side of light-emitting zone 30, when the surface density less than 30% of second optical element 18, with respect to from the light of light source 1 to LGP 3 incidents, the light of outgoing reduces outside LGP 3, causes brightness to descend.If the surface density of second optical element 18 surpasses 65%, then shine outside the LGP from first inclined-plane 22, the light that incides once more from second inclined-plane 24 in the LGP 3 increases.The shooting angle of this light during from the exiting surface outgoing departs from from appropriate value significantly, and therefore the light after the prismatic lens transmission causes brightness to descend not to positive outgoing.
In common planar light source device, the distance from the incidence surface to the viewing area is about 4mm.If when considering tolerance, it is irregular then need not produce demonstration in the zone that surpasses 3mm from incidence surface.In addition, usually, a plurality of light sources be the scope of 6mm～15mm at interval.Like this, making being spaced apart 6mm～15mm, leaving apart from incidence surface 10 in the zone of light-emitting zone 30 of position of 3mm of a plurality of light sources 1, calculate through optical analogy and can suppress to show irregular inclined-plane ratio.Its result, for example, with each relative light inlet zone 32 of a plurality of light sources 1 near the zone of light-emitting zone 30 take place under the situation of highlights, reduce the density of second optical element 18 in the zone of generation highlights.In addition, and a plurality of light source 1 between each relative light inlet zone 32 near the zone of light-emitting zone 30 produce under the situation of dark portion, increase the density that dark portion produces the second regional optical element 18.Promptly, can know: in the light-emitting zone 30 and the zone between the viewing area 34 of incidence surface 10 sides, suitably change through the density that makes second optical element 18, thereby can suppress to show irregular.
In addition, as shown in Figure 1, in the planar light source device that embodiment relates to, the interarea that is formed with a plurality of prism row 26 and the LGP 3 of prismatic lens 5 relatively are configured between diffusion sheet 9 and the LGP 3 downwards.Perhaps, as shown in Figure 2, diffusion sheet 28 relatively dispose with LGP 3, and face clamping diffusion sheet 28 ground and the LGP 3 of the opposition side of the face of a plurality of prism row of being formed with of prismatic lens 6,6a that make progress 27,27a relatively dispose.Its result can realize high brightness, high efficiency planar light source device.
Have again, in above-mentioned explanation, like Fig. 1 or shown in Figure 2, with first interarea 12 of LGP 3 as exiting surface, with second interarea 14 as reflecting surface.But, shown in figure 10, even second interarea 14 also can be realized equal effect as exiting surface and with prismatic lens 5 in the face of the ground configuration.Perhaps, shown in figure 11, even second interarea 14 also can be realized equal effect as exiting surface and with diffusion sheet 28 in the face of the ground configuration.Under this situation, by reflection part 7 reflections of facing with first interarea 12, and import once more in the LGP 3 from the light of first interarea, 12 outgoing.
(other embodiment)
As stated, though the present invention is put down in writing by embodiment of the present invention, the argumentation and the accompanying drawing that relate to its disclosed part should not be construed as limiting the present invention.Those skilled in the art obviously can be known embodiment, embodiment and the application technology of various replacements from this disclosure.Therefore, technical scope of the present invention should be regarded the specific item of invention that the suitable scope of asking for protection that obtains from above explanation relates to as.
Utilizability on the industry
LGP of the present invention and planar light source device can be used in liquid crystal indicators such as mobile phone, game machine, electronic documentation, automobile navigation instrument, notebook computer, TV etc.
Claims (15)
1. LGP is characterized in that:
Possess: matrix, a plurality of sides that have first and second interareas relative to each other and surround said first and second interareas;
A plurality of first optical elements, be configured on said first interarea and with the direction of the first side quadrature of said matrix on extend; And
A plurality of second optical elements, the entire scope outside near the light inlet zone removing of said second interarea is positioned at said first side are configuration mutually with leaving,
With regard to each of said a plurality of second optical elements; With said first lateral vertical have in the section cut open towards the normal of the inside of said matrix and first inclined-plane that intersects said first side and second inclined-plane relative with said first inclined-plane; Plane and each plane and the said first side angulation on plane of normal that comprises normal and said second interarea on said second inclined-plane of normal that comprises normal and said second interarea on said first inclined-plane is the scope of 90 degree ± 10 degree; With said first parallel sided have inclined side relative to each other in the section cut open, projection in each area of said second interarea than 0.0001mm
2Big and not enough 0.023mm
2Scope.
2. LGP according to claim 1 is characterized in that:
The normal angulation of said first inclined-plane and said first side is in the scope of and less than 10 degree bigger than 0.5 degree, and the normal angulation of said second inclined-plane and said first side is in the scope of and less than 89 degree bigger than 50 degree.
3. LGP according to claim 1 and 2 is characterized in that:
Each of said inclined side and with the line angulation γ of the normal quadrature of said second interarea in the scope of and less than 75 degree bigger than 40 degree.
4. according to each described LGP in the claim 1 to 3, it is characterized in that:
Said first inclined-plane and second inclined-plane and said inclined side are minute surfaces.
5. according to each described LGP in the claim 1 to 4, it is characterized in that:
With the zoning of disposing said a plurality of second optical elements is light-emitting zone; The side of the opposition side of said first side is defined as second side, and the number that said a plurality of second optical elements are configured to the per unit area in the end regions of said second side of said light-emitting zone is more than the end regions of said first side of said light-emitting zone.
6. LGP according to claim 5 is characterized in that:
With the said second interarea projection in the said first side plane orthogonal time, from the end of said first side of said light-emitting zone to said light-emitting zone inner 1mm with interior zone, be 1mm with respect to projected area
2The number percent of projected area of said a plurality of second optical elements any first view field, that said first view field is contained in the scope more than 10% and below 40%; From the end of said second side of said light-emitting zone to said light-emitting zone inner 1mm with interior zone, be 1mm with respect to projected area
2The number percent of projected area of said a plurality of second optical elements any second view field, that said second view field is contained in the scope more than 30% and below 65%.
7. according to each described LGP in the claim 1 to 6, it is characterized in that:
Each of said a plurality of first optical elements with said first parallel sided the section shape cut open be the isosceles triangle of drift angle with scope of and less than 150 degree bigger than 80 degree.
8. according to each described LGP in the claim 1 to 6, it is characterized in that:
Said a plurality of first optical elements with said first parallel sided the section shape cut open comprise a plurality of isosceles triangles of the different drift angles of scope with and less than 150 degree bigger than 80 degree.
9. planar light source device, the irradiating liquid crystal display element is characterized in that:
Possess: LGP, this LGP are according to each described LGP in the claim 1 to 8;
Light source relatively disposes said first side as incidence surface and with said incidence surface;
Reflection part, with the reflecting surface of said LGP in the face of ground configuration and will be from the light of said reflecting surface incident to said LGP internal reflection; And
The optically focused parts are configured to assemble from the ground, the direction of propagation of the light of said exiting surface incident in the face of the exiting surface and the control of the opposition side of said reflecting surface.
10. planar light source device according to claim 9 is characterized in that:
With the zoning of disposing said a plurality of second optical elements is light-emitting zone; The side of the opposition side of said first side is defined as second side, and said a plurality of second optical elements are configured in the number of the per unit area of the end regions of said second side of said light-emitting zone more than the end regions of the said incidence surface side of said light-emitting zone.
11. planar light source device according to claim 10 is characterized in that:
With said liquid crystal display cells accordingly will in be wrapped in the said LGP of said light-emitting zone zoning be the viewing area; With the said second interarea projection of said LGP in said incidence surface plane orthogonal the time; From the end of the incidence surface side of said light-emitting zone to said light-emitting zone inner 1mm with interior zone, be 1mm with respect to projected area
2The number percent of projected area of said a plurality of second optical elements any first view field, that said first view field is contained in the scope more than 10% and below 40%; From the end of said second side of said light-emitting zone to said light-emitting zone inner 1mm with interior zone, be 1mm with respect to projected area
2The number percent of projected area of said a plurality of second optical elements any second view field, that said second view field is contained in the scope more than 30% and below 65%.
12., it is characterized in that according to each described planar light source device in the claim 9 to 11:
Said exiting surface is said first interarea.
13., it is characterized in that according to each described planar light source device in the claim 9 to 11:
Said exiting surface is said second interarea.
14., it is characterized in that according to each described planar light source device in the claim 9 to 13:
Said optically focused parts comprise downward prismatic lens, and the interarea that this downward prismatic lens is configured to be arranged with a plurality of prism row is in the face of said exiting surface.
15., it is characterized in that according to each described planar light source device in the claim 9 to 13:
Said optically focused parts comprise: be configured to the diffusion sheet faced with said exiting surface; With relative other interarea clamping said diffusion sheet ground downward prismatic lens relative of interarea that is configured to and is arranged with a plurality of prism row with said exiting surface.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010201893 | 2010-09-09 | ||
| JP2010-201893 | 2010-09-09 | ||
| JP2011-100725 | 2011-04-28 | ||
| JP2011100725A JP2012079681A (en) | 2010-09-09 | 2011-04-28 | Light guide plate and surface light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102401929A true CN102401929A (en) | 2012-04-04 |
Family
ID=45884326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102713014A Pending CN102401929A (en) | 2010-09-09 | 2011-09-06 | Light guide plate and face light source device |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20120026451A (en) |
| CN (1) | CN102401929A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024032697A1 (en) * | 2022-08-10 | 2024-02-15 | 伟时电子股份有限公司 | Light guide plate and backlight module |
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| US5719649A (en) * | 1994-06-08 | 1998-02-17 | Kabushiki Kaisha Toshiba | Light guide and liquid crystal display device using it |
| CN1441297A (en) * | 2002-02-28 | 2003-09-10 | 三洋电机株式会社 | Display device and light guide plate |
| TW200508677A (en) * | 2003-08-29 | 2005-03-01 | Hon Hai Prec Ind Co Ltd | Surface light source device |
| CN1700074A (en) * | 2004-05-20 | 2005-11-23 | 精工电子有限公司 | Illuminator and display device used thereby |
| CN101446405A (en) * | 2007-11-27 | 2009-06-03 | 美蓓亚株式会社 | Spread illuminating apparatus |
| CN101457906A (en) * | 2007-12-10 | 2009-06-17 | 日立化成工业株式会社 | Backlight unit |
-
2011
- 2011-09-02 KR KR1020110088961A patent/KR20120026451A/en not_active Application Discontinuation
- 2011-09-06 CN CN2011102713014A patent/CN102401929A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5719649A (en) * | 1994-06-08 | 1998-02-17 | Kabushiki Kaisha Toshiba | Light guide and liquid crystal display device using it |
| CN1441297A (en) * | 2002-02-28 | 2003-09-10 | 三洋电机株式会社 | Display device and light guide plate |
| TW200508677A (en) * | 2003-08-29 | 2005-03-01 | Hon Hai Prec Ind Co Ltd | Surface light source device |
| CN1700074A (en) * | 2004-05-20 | 2005-11-23 | 精工电子有限公司 | Illuminator and display device used thereby |
| CN101446405A (en) * | 2007-11-27 | 2009-06-03 | 美蓓亚株式会社 | Spread illuminating apparatus |
| CN101457906A (en) * | 2007-12-10 | 2009-06-17 | 日立化成工业株式会社 | Backlight unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024032697A1 (en) * | 2022-08-10 | 2024-02-15 | 伟时电子股份有限公司 | Light guide plate and backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20120026451A (en) | 2012-03-19 |
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Application publication date: 20120404 |