CN100514150C - Illuminator and display device used thereby - Google Patents
Illuminator and display device used thereby Download PDFInfo
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- CN100514150C CN100514150C CNB2005100737339A CN200510073733A CN100514150C CN 100514150 C CN100514150 C CN 100514150C CN B2005100737339 A CNB2005100737339 A CN B2005100737339A CN 200510073733 A CN200510073733 A CN 200510073733A CN 100514150 C CN100514150 C CN 100514150C
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Abstract
The illumination device comprises a light guide plate 2 and point light sources 1 arranged at the incident face side of the light guide plate, and fine scattering structures 20 separated from each other are formed on almost whole surfaces of a light-emitting surface and the surface at an opposite side. The fine scattering structure 20 has a directivity of a longitudinal direction in its shape, and the longitudinal direction is almost parallel with the direction connecting the fine scattering structure and the point light source. Further, the surface at the opposite side of the light-emitting surface of the light guide plate is divided into a plurality of areas 9, 10, 11, and a thickness of the light guide plate at each area becomes thinner as it becomes distant from the light source.
Description
Technical field
The present invention relates to be used in lighting device in computer equipment, portable phone or general electronic equipment etc. and the display device of using it.
Background technology
Requirement for slim, the lightweight of using color liquid crystal display arrangement in computer equipment or portable phone etc. in recent years, high brightnessization, low power consumption is more and more higher.Accompany therewith,, adopt the higher high-brightness LED of luminescence efficiency more as the light source of the lighting device that is used in color liquid crystal display arrangement.And the design that will seal and be radiated at the light guide plate of liquid crystal display cells from the light of light source has also realized paying attention to the design of the such pointolite of LED energetically.At length, disclose: thus the diffusion graphic elements that is arranged in the directivity that has length direction in shape at the light guide plate back side makes the almost vertical technology that improves outgoing efficient of its length direction and the direction that links diffusion graphic elements and light source; And have in 1/2 zone of light guide plate and to tilt to make diffusion graphic elements band of density to give the undersaturated structure of effect (for example, with reference to No. 3151830 communique of patent) of light characteristic.
Like this, in conventional illuminating device, because the length direction of shape is almost vertical with the direction that is connected diffusion graphic elements and light source, so there is such problem: can not obtain with respect to the arranging density of diffusion graphic elements that with the diffusion graphic elements is the circular arc direction at center, be difficult to carry out pattern arrangement fully greatly.Perhaps, when about 1/2 of light guide plate has to tilt, because in sloping portion, changed synchronously by the reflection of light angle of multipath reflection and propagation, so be difficult to carry out the design of diffusion graphic elements in inside.
Summary of the invention
Therefore, the object of the invention is to provide the lighting device of a kind of structural optimization of the lighting device that will use pointolites such as LED and slim, light weight, high brightness.
Lighting device of the present invention relates to the lighting device that a kind of light entrance face in light guide plate has pointolite, wherein forms trickle diffusing structure body (micro-structure for light-scattering) on light guide plate and the face light-emitting face opposition side almost whole.This fine structure body is set up a plurality of, and configured separate separately.And each trickle diffusing structure body has the directivity of length direction in shape at it, is in the direction almost parallel of the pointolite of bee-line in its length direction and the trickle diffusing structure body of binding and a plurality of light source.According to this structure, can not lose with respect to outgoing efficient from the light of pointolite, can obtain with respect to the arranging density of diffusion graphic elements that with the pointolite is the circular arc direction at center fully greatly.
In addition, the side of trickle diffusing structure body is the structure that is roughly parallel to the direction that links the pointolite that is in bee-line in trickle diffusing structure body and a plurality of pointolite.According to this structure, compare with the trickle diffusing structure body of shapes such as in the past triangular prism or semicolumn, can improve the light reflection efficiency of trickle diffusing structure body.
In addition, the light-emitting face of light guide plate or the face of opposition side are to be made of the divided a plurality of zones, plane of incidence almost parallel ground with light guide plate, are along with the thin more structure away from a plurality of light sources more for the thickness of the light guide plate in a plurality of zones.Like this, utilize the structure of the thickness attenuation of the light guide plate that makes the point of distance source region, can improve the utilization ratio of trickle diffusing structure body, can not make simultaneously at the reflection of light angle of light guide plate internal communication to change.Therefore, the design of trickle diffusing structure body becomes easy.
And then, for the boundary surface in a plurality of zones that on light guide plate, form to be shaped as with a plurality of pointolites be the circular arc at center.By this structure, the light that is reflected in boundary surface also efficiently at trickle diffusing structure body by secondary reflection again, can realize the bright illumination device.
In addition, in light guide plate inside, along with the point of distance light source, the energy density of propagates light reduces.So, in order to throw light on uniformly, constituting along with the point of distance light source, it is big that the formation density of trickle diffusing structure body becomes.
Especially, light guide plate being divided under the situation in the different zone of a plurality of thickness, by the variation of light guide plate, the optical energy density of light guide plate inside changes discontinuously.And in each zone, along with the point of distance light source, the optical energy density of propagates light diminishes.So the trickle diffusing structure bodily form becomes that density becomes big along with the point of distance light source in the inside, city, a plurality of district on being formed at light guide plate.At this moment, the formation density of trickle diffusing structure body clips boundary surface and changes discontinuously.By this structure, can throw light on equably.
In addition, when effective land productivity has been used for self-configuring light time of light entrance face of pointolite, section by the trickle diffusing structure body on the direction that will link the pointolite that is in bee-line in trickle diffusing structure body and a plurality of pointolite is made the approximate right angle triangle, just can improve the utilization ratio of light.
On the contrary, be used to from the catoptrical situation of the light guide plate end face of the light entrance face opposition side that has disposed pointolite under, section by the trickle diffusing structure body on the direction that will link the pointolite that is in bee-line in trickle diffusing structure body and a plurality of pointolite is made roughly isosceles triangle, just can improve the light utilization ratio.
Can not form with enough big density under the situation of trickle diffusing structure body on the light guide plate, just on almost whole of the light-emitting face of light guide plate, form the second trickle diffusing structure body that leaves mutually.This second trickle diffusing structure body is also in the directivity that has length direction in shape, and its length direction with link the second trickle diffusing structure body and a plurality of light sources in be in the direction almost parallel of pointolite of bee-line or vertical.According to this structure, just can directly obtain illumination light from light-emitting face.
At this moment, by the section that will link the second trickle diffusing structure body on the second trickle diffusing structure body and the pointolite direction square up triangle or isosceles triangle, just can improve the light utilization ratio.And then, by light diffusing patch or prismatic lens being set mutually opposed to each other, can seeking optimization, and can become the bright illumination device from the illumination radiation distribution of lighting device with the light guide plate exit facet.And then, in order to utilize the light that leaks out from the end face of light guide plate again and improve the light utilization ratio, with the face of the photoirradiated surface opposition side of light guide plate and mutually opposed except the side perpendicular to photoirradiated surface of light entrance face, be furnished with reflection layer.
And, utilize housing holding point light source, light guide plate, light diffusing patch, the reflection layer of photoirradiated surface one side opening of light guide plate, can realize processing ease, stability, the lighting device that reliability is high by this structure.
In addition, by the lighting device of above-mentioned a certain structure and the display element of non-emissive type are used in combination, just can realize high brightness and display device slim, light weight.
Description of drawings
Fig. 1 is the sectional view that schematically shows lighting device of the present invention.
Fig. 2 is the planimetric map that schematically shows lighting device of the present invention.
Fig. 3 is the sectional view that schematically shows the light guide plate that is used in lighting device of the present invention.
Fig. 4 A, 4B, 4C are the synoptic diagram that explanation is formed on the trickle diffusing structure body on the light guide plate of the present invention.
Fig. 5 A, 5B are the synoptic diagram that explanation is formed on the trickle diffusing structure body on the light guide plate of the present invention.
Fig. 6 is the synoptic diagram that explanation is formed on the trickle diffusing structure body on the light guide plate of the present invention.
Fig. 7 is the synoptic diagram that explanation is formed on the trickle diffusing structure body on the light guide plate of the present invention.
Fig. 8 is the synoptic diagram that explanation is formed on the trickle diffusing structure body on the light guide plate of the present invention.
Fig. 9 is the synoptic diagram of section shape of the light guide plate of expression lighting device of the present invention.
Figure 10 is the synoptic diagram of section shape of the light guide plate of expression lighting device of the present invention.
Figure 11 is the synoptic diagram of section shape of the light guide plate of expression lighting device of the present invention.
Figure 12 is the schematic plan view of arrangement of the trickle diffusing structure body of expression lighting device of the present invention.
Figure 13 is the sectional view that schematically shows liquid crystal indicator of the present invention.
Embodiment
The structure of lighting device of the present invention is described with reference to Fig. 4 A, Fig. 9.Schematically shown in Figure 9, lighting device of the present invention possess pointolite 1, with the light of pointolite from the light guide plate 2 of light entrance face direct light exit facet and be formed on light guide plate with the light-emitting face opposite sides on a plurality of trickle diffusing structure body 18.And shown in Fig. 4 A, the length direction of this trickle diffusing structure body 18 is roughly consistent with the direction that light from pointolite incides trickle diffusing structure body.Perhaps, the length direction of trickle diffusing structure body also can be and the straight line almost parallel that links trickle diffusing structure body and pointolite.And then 2 sides that constitute trickle diffusing structure body form that upwardly extending imaginary plane intersects at pointolite in pointolite side with each side.Also 2 sides that constitute this trickle diffusing structure body can be constituted with the light diffusing surface.Perhaps, also can constitute with the curved surface with fluctuating or a plurality of planar combination.And then, can be with these 2 sides as light diffusion face.
In addition, the light-emitting face of light guide plate or be divided into a plurality of zones with the face of light-emitting face opposition side, the thickness of the light guide plate in these a plurality of zones is more away from the thin more structure of light source.And then these a plurality of zones are divided into and the straight line that links trickle diffusing structure body and pointolite quadrature roughly.Particularly, the shape of the boundary surface in a plurality of zones being made with the pointolite is the circular arc of approximate centre.And constituting with this boundary surface is that the formation density of the diffusing structure body on boundary changes discontinuously.
In addition, being provided with under the situation of a plurality of pointolites,, form above-mentioned trickle diffusing structure body corresponding to each light source.
Below, based on accompanying drawing the present invention is specifically described.
Fig. 1 and Fig. 2 are the side cut away view and the planimetric maps of basic structure of the lighting device of expression present embodiment.As shown in Figure 1, with the light entrance face of light guide plate 2 mutually arranged opposite pointolite 1. light entrance faces be vertical position relation with light-emitting face.Here, use the LED element to be used as pointolite 1. in the LED element, known have: White LED, will from the radiating light of blue led with yellow fluorophor carry out wavelength conversion produce green light and red light and and original blue light additive mixture, thereby obtain white light; And 3 mixture of colours LED, obtain white light near configuration and additive mixture mutually by blue led with the red LED of burn red, the green LED of glow green, the coloured light that turns blue.These light sources have the light-emitting zone about light guide plate, and the length of this light-emitting zone is compared enough weak points with the length of light entrance face direction, can be used as pointolite and treats.
Pointolite 1 is installed on side by side on the FPC substrate 7 of having implemented electrode wiring on the macromolecule membranes such as polyimide, and never illustrated power supply provides electric power.The situation that a plurality of pointolites use side by side is more.Fig. 2 represents the example of pointolite 1a, 1b, a 1c3 situation about using side by side.When pointolite was from the lateral emitting type of the side incident of as shown in Figure 2 light guide plate 2 and is used in the spot light of portable phone etc., the quantity of LED was used 2～5 usually.In addition, under the situation as the liquid crystal indicator that is used in notebook computer, under situation about being used in more than or equal to the bigger liquid crystal indicator about 15 types, usage quantity is the LED about 300～400.The present invention is also applicable to the lighting device of having considered with 11 corresponding radioactive nature of a plurality of pointolites.
In addition, with with vertical three sides of the light entrance face of light guide plate 2 and the back side, in other words face mutually with 4 faces except the light guide plate of light-emitting face and light entrance face, be furnished with reflection layer 3,4. this reflection layer 3,4 is furnished with Ag and Al or these compounds are formed on the macromolecule membrane on surface or the macromolecule membrane that mixture of white pigment improves reflectivity with vacuum evaporation.
On the other hand, with the light-emitting face opposite disposed of light guide plate 2 light diffusing patch 5 and prismatic lens 6. light diffusing patch 5 be to form trickle diffusing structure body such as particle on the surface or at the transparent membrane of surface applied hollow bead, play making from the light diffusion of light guide plate 2 outgoing and make the effect of homogenising.By being furnished with this light diffusing patch 5, can reducing the harmful effect that the brightness disproportionation that produces in the emergent light from light guide plate 2 or open-wire line etc. cause.
In addition, prismatic lens 6 is the transparent membranes at the almost parallel a plurality of trickle prisms of rule of surface ground formation crest line and light entrance face.This prism will transform to the direction vertical with the face of prismatic lens from the emergence angle of the radiating light of light guide plate 2, and the vision dependence of brightness is improved.Fig. 1 has represented only to dispose the situation of 1 prismatic lens, but also can be furnished with almost 2 prismatic lenses of quadrature of mutual crest line.Perhaps, be used to emergence angle, can omit prismatic lens 6. from the radiating light of light guide plate 2
More than Shuo Ming each key element utilizes housing 8 to support, fix.By each key element is supported, is fixed on this housing 8, even apply mechanical force, also can not destroy the position relation between each key element from the outside, carry out stable illumination, handle also becoming easy simultaneously.In addition, the macromolecular material that utilizes the material that the Chinese white isoreflectance is high to mix forms this housing 8, thereby just can omit reflection layer 3 and 4.
In addition, the light guide plate 2 that is used in the lighting device of present embodiment is divided into a plurality of zones.Expression is divided into the example in 3 zones 9,10,11 in Fig. 2, according to the size and the thickness of light guide plate, usually further is divided into a plurality of zones.Fig. 3 schematically shows this situation of cutting apart.As shown in the figure, in the thickness difference of each regional light guide plate.That is, observe from pointolite 1, the thickness of regional light guide plate 2 far away more is just thin more.
In the embodiment shown in Figure 2, the circular arc of describing for center roughly with pointolite 1a, 1b, 1c is made on the border 12 and 13 in each zone 9,10,11.Say that strictly preferably making with the light from each pointolite incident is the circular arc at center at the convergent point of the diffusion of light guide plate inside.Like this, by making the boundary shape in divided zone circular-arc, the light that is reflected in boundary surface is because to the center of this circular arc (being the pointolite side) reflection, so can utilize the trickle diffusing structure body that is formed at light guide plate to reflect efficiently once again and be used.Though the shape of the profile direction of boundary surface 12,13 is without limits, approximate vertical or to make it be inclined to drift angle be the obtuse angle preferably.Thus, the open-wire line that produces in boundary surface is reduced.In addition, the height of the end difference of boundary line is better about 20～100 μ m.That is, each regional change of light guide plate 2 is for better about attenuation 20～100 μ m respectively.Do not expect to take place following situation: if the height of end difference is lower than above-mentioned scope the quantity of cut zone is increased, and if the height of end difference be higher than above-mentioned scope, then the influence of open-wire line etc. becomes big.
In addition, the face of cut zone no matter be the light-emitting face side or and the face of light-emitting face side opposition side can.When the light-emitting face side is divided into the zone, do not form in the light-emitting face side under the situation of trickle diffusing structure body, the making of light guide plate becomes easily, but that the open-wire line of zone boundary becomes easily is showy.This is can be by the coning angle that makes the end difference that forms the zone boundary mild or haze value (haze value) optimization of light diffusing patch is relaxed.On the other hand, under the situation that will be divided into the zone with the face of light-emitting face opposition side, though open-wire line is not too showy, it is complicated that the method for making of trickle diffusing structure body becomes.
Like this, in each zone, change the thickness of light guide plate, thin more according to the zone of point of distance light source more, along with the point of distance light source, the light interreflection number of times of light guide plate inside is increased.Light is propagated in light guide plate 2, and along with the point of distance light source, optical energy density descends.Therefore, when will along with the point of distance light source, making the formation density of trickle diffusing structure body become big from the uniform light time of light-emitting face outgoing of light guide plate.Therefore, under situation about light guide plate 2 not being divided into, be formed on formation density from the trickle diffusing structure body at the pointolite light guide plate back side farthest for maximum as above-mentioned zone.
In addition, because the cut zone that forms is helped by the plane that is parallel to light-emitting face, so even its thickness is different in each zone, the angle that the propagates light in inside incides the light-emitting face or the back side spreads all over whole light guide plate and is not divided into the not variation of these regional situations.Therefore, the design relevant with angle with the size of trickle diffusing structure body except forming density all the other and not carry out the situation of Region Segmentation identical.
, as Fig. 2 and shown in Figure 3, when light guide plate being divided into different regional of thickness, because in the interreflection number of times difference of each intra-zone, so the formation density of only trickle diffusing structure body is also different.On the other hand, in each zone, the position optical energy density of point of distance light source is just more little.Therefore, clip each regional border,, then can change discontinuously if the density that forms trickle diffusing structure body moves on to than its zone far away from the zone of pointolite side., in each zone, along with the point of distance light source, the formation density of trickle diffusing structure body must become big.
Below, describe at the shape of trickle diffusing structure body.Fig. 4 A schematically shows the perspective view of the trickle diffusing structure body of seeing from the light-emitting area of light guide plate.Fig. 4 B is illustrated in the section shape of the dot-and-dash line CD among Fig. 4 A, and Fig. 4 C is illustrated in the section shape of dot-and-dash line AB.The trickle diffusing structure body that is formed at the light guide plate back side is made to the inboard concavity that caves in of light guide plate, and this shape has directivity in the longitudinal direction.Trickle diffusing structure body is by 2 inclined-planes 14 that intersect at crest line 16 and 15 and constitute with 2 the side 17a and the 17b of the back side approximate vertical of light guide plate.Therefore, shown in Fig. 4 B, do quadrate or rectangle at the section of dot-and-dash line CD.In this embodiment, it is bigger than another inclined-plane 15 areas to be positioned at the inclined-plane 14 of pointolite side.It is roughly consistent with the direction that light from pointolite incides trickle diffusing structure body that the trickle diffusing structure bodily form becomes its length direction.Have under a plurality of situations at pointolite, the trickle diffusing structure bodily form becomes with to incide the direction of trickle diffusing structure body roughly consistent from being in light from the pointolite of trickle diffusing structure body bee-line.Like this, the length direction of trickle diffusing structure body forms and to incide the light of this trickle diffusing structure body from pointolite roughly parallel.In addition, the side 17a of trickle diffusing structure body and 17b form the side are intersected near pointolite along the imaginary plane that the pointolite direction prolongs respectively.Have under a plurality of situations at pointolite, the side 17a of trickle diffusing structure body and 17b form imaginary plane that the side is prolonged along the pointolite direction respectively be in the pointolite of trickle diffusing structure body bee-line near intersect.By making the shape of trickle diffusing structure body like this, can make light 14 reflections on the inclined-plane efficiently, and can make the brightness maximization from pointolite.
Other examples at the shape of trickle diffusing structure body describe.Fig. 5 A schematically shows the perspective view of the trickle diffusing structure body of seeing from the light-emitting area of light guide plate.Fig. 5 B is illustrated in the section shape of dot-and-dash line CD of Fig. 5 A of this trickle diffusing structure body.The trickle diffusing structure body that is formed at the light guide plate back side is made to the inboard concave shape that caves in of light guide plate, and this shape has directivity in the longitudinal direction.Trickle diffusing structure body is made of 4 planes 14,15,17a and the 17b that intersect at crest line 16.In the example of Fig. 4 A, 4B formerly, 4C, the back side approximate vertical of side 17a, 17b and light guide plate.But in the example of Fig. 5 A, beveling.Therefore, shown in Fig. 5 B, section is done triangularity.Because trickle diffusing structure body becomes big to the inclined-plane of light source area in the structure shown in Fig. 4 A, so, preferably itself so that from the light of pointolite more to the light-emitting face reflection/deflection of light guide plate.On the other hand, from not only increasing the configuration density of trickle diffusing structure body but also can guarantee this viewpoint of the amount of light that rearward sees through, the structure of preferred Fig. 5 A.In addition, in the structure shown in Fig. 5 A, because do not have crest line, so help suppressing the generation of open-wire line of the light-emitting face of light guide plate at trickle diffusing structure body top.The example of other structures of trickle diffusing structure body, effect and Fig. 4 A is identical.
In addition, use Fig. 6 to describe at other shapes of trickle diffusing structure body.Fig. 6 is the synoptic diagram of the trickle diffusing structure body seen from the back side of light guide plate.The trickle diffusing structure body that is formed at the light guide plate back side is made to the inboard concave shape that caves in of light guide plate, and this shape has directivity in the longitudinal direction.Trickle diffusing structure body is made of 4 planes 14,15,17a and the 17b that intersect at crest line 16.In that to utilize side 17a, 17b to form on 1 this aspect of crest line different with the example of Fig. 5 A.Therefore, the section shape of the trickle diffusing structure body that is produced by the straight line that links trickle diffusing structure body and pointolite is trapezoidal or quadrilateral., make the rough surface of side 17a, 17b here, and make the light generation diffuse reflection of inciding the side.In order to make diffusion effect remarkable, to compare with the structure of Fig. 5 A, the area of side 17a, 17b increases.Thus, the diffused light at the light-emitting face of light guide plate is increased, not only suppress the generation of open-wire line and the generation of interference fringe, and do not need to be arranged on the diffusing panel on the light-emitting face of light guide plate in the past.
And then, use Fig. 7 to describe at other shapes of trickle diffusing structure body.Fig. 7 is the synoptic diagram of the trickle diffusing structure body seen from the back side of light guide plate.The trickle diffusing structure body that is formed at the light guide plate back side is made to the inboard concave shape that caves in of light guide plate, and this shape has directivity in the longitudinal direction.Trickle diffusing structure body is made of 4 planes 14,15,17a and the 17b that intersect at crest line 16.In that to utilize side 17a, 17b to form on 1 this aspect of crest line the structure with Fig. 6 identical.But here, crest line is S shape or has the curve shape of other systematicness or do not have the curve-like or the sawtooth wire of systematicness.According to this shape, when the light diffusion area of side 17a, 17b face increases than the structure of Fig. 6, can be controlled at the diffuse direction of the light of offside reflection.Therefore, can be suppressed at the generation of open-wire line of light-emitting face of light guide plate or the generation of interference fringe.
And then, use Fig. 8 to describe at other shapes of trickle diffusing structure body.Fig. 8 is the synoptic diagram of the trickle diffusing structure body seen from the back side of light guide plate.The trickle diffusing structure body that is formed at the light guide plate back side is made to the inboard concave shape that caves in of light guide plate, and this shape has directivity in the longitudinal direction.Trickle diffusing structure body constitutes by 2 inclined- planes 14,15 that intersect at crest line 16 and with 2 the side 17a and the 17b of the back side approximate vertical of light guide plate.In example shown in Figure 8, the inclined-plane 14 that is positioned at the pointolite side is bigger than another inclined-plane 15 areas.It is roughly consistent with the direction that incides trickle diffusing structure body near the light the pointolite that the trickle diffusing structure bodily form becomes its length direction.By doing like this, as the 2in1 chip, on 1 led chip, comprised under the situation of a plurality of pointolites, can be with 14 reflections on the inclined-plane efficiently from the light of a plurality of pointolites, and can make the brightness maximization.
Below, use accompanying drawing to be described in detail at the section shape of the length direction of trickle diffusing structure body.Fig. 9 is the synoptic diagram of section shape that is illustrated in the light guide plate of the line suitable with the dot-and-dash line AB of Fig. 4 A, Fig. 5 A.In example shown in Figure 9, the section that is in the trickle diffusing structure body 18 in the direction of the pointolite 1 of bee-line and trickle diffusing structure body 18 in linking a plurality of light sources is roughly right-angle triangle.That is the back side approximate vertical of inclined-plane shown in Fig. 4 A or Fig. 5 A 15 and light guide plate 2.The back side angulation of inclined-plane 14 and light guide plate 2 depends on the thickness, length of light guide plate or in the emergence angle of light-emitting face etc., still, it is in the scopes of 5～55 degree.This angle is little to 5～15 degree during the left and right sides, because the light that can in light guide plate, propagate with total reflection condition or approaching with it conditioned reflex, so light outgoing efficient uprises.But, because emergence angle is with respect to the bigger inclination of vertical line generation of the light-emitting face that stands in light guide plate, so the viewing angle characteristic variation.Therefore, in this case, need proofread and correct with 6 pairs of emergence angle of prismatic lens shown in Figure 1.In addition, this angle is greatly when 45～55 spend, because the light to propagate in light guide plate away from the conditioned reflex of total reflection condition, so light outgoing efficient step-down.But emergence angle becomes 0 ± 15 angle of spending with respect to the vertical line of the light-emitting face that stands in light guide plate, so be reflected at visual direction (in the vertical line direction of light-emitting face) glazing, does not need prismatic lens 6.
Equally, other section shapes at the length direction of trickle diffusing structure body use Figure 10 to describe.In example shown in Figure 10, the section shape of trickle diffusing structure body 18 is an isosceles triangle.By section shape is made isosceles triangle, make from improving to the efficient of light-emitting face side with the back light of the light entrance face opposing end faces that has disposed pointolite 1, the reflected light that produces by the boundary surface of cut zone.
For the typical sizes of the trickle diffusing structure body of Fig. 4 A～shown in Figure 10, bottom surface length on one side is 5～50 μ m * 7～120 μ m, highly is 5～120 μ m.This size is according to the pitch angle on section shape or inclined-plane etc. and different.When thinking to obtain density as much as possible, the minor face size of bottom surface is set at little value to about 5 μ m.
Figure 12 schematically shows the concrete example of the arrangement of trickle diffusing structure body.As shown in the figure, use 3 LED1a, 1b, 1c as pointolite here.The length direction that trickle diffusing structure body 20 is arranged in its shape with and the straight line almost parallel that links near the LED of each trickle diffusing structure body.Light guide plate 2 is divided into 3 zones 9,10,11, and in each zone, along with away from LED, it is big that the formation density of trickle diffusing structure body 20 becomes.And then regional 10 the time when moving to from zone 9, the formation density of trickle diffusing structure body 20 reduces discontinuously.The reduction of this density is by the difference decision of each regional light guide plate.
Because the length direction of trickle diffusing structure body 20 with and the straight line parallel that links of LED arrange, be the packed density of the circular arc direction at center so can obtain significantly near with LED, consequently scattering properties also is difficult to saturated.In addition because along with away from the attenuation of LED light guide plate, so at the interreflection number of times of inside along with become big away from LED.Therefore, being formed on the density that is in away from the trickle diffusing structure body in the zone in the place of LED can diminish with not forming 9,10,11 o'clock the density comparison in zone.And then, by from the arrangement of trickle diffusing structure body exclusionary rules as much as possible, thereby can suppress the generation of moire fringes etc.
On the other hand, as shown in figure 11, except the trickle diffusing structure body 18 at the back side that is arranged on light guide plate 2, other the second trickle diffusing structure body 19 can be set also at the light-emitting face of light guide plate 2.This second trickle diffusing structure body 19 has in the not intact propagates light composition scattering of scattering and from the function of light-emitting face outgoing of the trickle diffusing structure body 18 that is formed at the back side.The flat shape of the second trickle diffusing structure body 19 is and Fig. 4 A, 4B, the same shape of 4C that its side forms to be parallel to and links the straight line that is in the nearest pointolite and the second trickle diffusing structure body 19.In addition, if the second trickle diffusing structure body 19 that is formed at the light-emitting face side just produces effect with about 1/5～1/50 the same formation of density of the formation density of the trickle diffusing structure body 18 that is formed on the back side.Therefore, can arrange the second trickle diffusing structure body, make its length direction with vertical with the direction of pointolite johning knot.In addition, the section shape of the second trickle diffusing structure body 19 shown in Figure 11 becomes the triangle that is convex in the outside of light guide plate.As this leg-of-mutton shape, depend on design load from the light emergence angle of light-emitting face.In addition, when the second trickle diffusing structure body 19 being made when being concave shape in the inboard of light guide plate, the light that is reflected at this trickle diffusing structure body changes direction in the light guide plate rear side.And, at the light guide plate back side or the reflection layer that is arranged on the back side be reflected the back from light-emitting face by outgoing.
At last, use Figure 13 to describe at the liquid crystal indicator that has used lighting device of the present invention.Lighting device possesses the light guide plate 2 of above-mentioned a certain structure, faces mutually with the light entrance face of light guide plate 2 and has disposed pointolite 1.Pointolite 1 is installed on the FPC substrate 7.In addition, be provided with reflection layer 3,4, make three sides and the back side with light guide plate 2, in other words face mutually with 4 faces except the light guide plate of light-emitting face and light entrance face.And, be provided with liquid crystal display cells 21 at the upside of the light-emitting face of light guide plate.And then, light diffusion eyeglass 5 and prismatic lens 6 are set between light guide plate 2 and liquid crystal display cells 21.As liquid crystal display cells, can adopt the infiltration type active matrix liquid crystal display element that has used the TFT element or use infiltration type passive matrix liquid crystal display cells of stn liquid crystal etc. etc.This liquid crystal display cells 21 utilizes and keeps the housing 8 of lighting device to be kept jointly.On liquid crystal display cells, be connected with not shown circuit substrate, and provide electric power and drive signal from liquid crystal display drive circuit to it.By making liquid crystal indicator shown in Figure 12, can realize the liquid crystal indicator that brightness is even and bright.
Like this,, realize having used slim, the light-weighted while of the lighting device of pointolites such as LED, can realize that the light utilization ratio is higher, the lighting device and the display device of high brightness and low-power consumption according to the present invention.
Claims (15)
1. lighting device, it is characterized in that, possesses pointolite, will be from the light of above-mentioned pointolite light guide plate from light entrance face direct light exit facet, and a plurality of trickle diffusing structure body that on the face of the opposite side with above-mentioned light-emitting face of above-mentioned light guide plate, forms, above-mentioned trickle diffusing structure body is the concave shape to the inner recess of above-mentioned light guide plate, this concave shape has the inclined-plane (14) of light source side, and the direction of light that incides above-mentioned trickle diffusing structure body from above-mentioned pointolite is roughly consistent with the length direction of above-mentioned trickle diffusing structure body, and the inclined-plane reflection of above-mentioned light source side is from the light of above-mentioned pointolite.
2. lighting device as claimed in claim 1 is characterized in that, the length direction of above-mentioned trickle diffusing structure body and the straight line almost parallel that links above-mentioned trickle diffusing structure body and above-mentioned pointolite.
3. lighting device as claimed in claim 1 is characterized in that, 2 sides that constitute above-mentioned trickle diffusing structure body form the side that makes separately and intersect at above-mentioned pointolite place along the imaginary plane that the pointolite direction prolongs.
4. lighting device as claimed in claim 3 is characterized in that, 2 sides that constitute above-mentioned trickle diffusing structure body are light diffusion faces.
5. lighting device as claimed in claim 3 is characterized in that, 2 sides that constitute above-mentioned trickle diffusing structure body are made of the curved surface with fluctuating or a plurality of planar combination.
6. lighting device as claimed in claim 1 is characterized in that, the section shape of the above-mentioned trickle diffusing structure body that is produced by the straight line that links above-mentioned trickle diffusing structure body and above-mentioned pointolite is a right-angle triangle.
7. lighting device as claimed in claim 1 is characterized in that, the section shape of the above-mentioned trickle diffusing structure body that is produced by the straight line that links above-mentioned trickle diffusing structure body and above-mentioned pointolite is an isosceles triangle.
8. lighting device as claimed in claim 1 is characterized in that, the section shape of the above-mentioned trickle diffusing structure body that is produced by the straight line that links above-mentioned trickle diffusing structure body and above-mentioned pointolite is trapezoidal.
9. lighting device as claimed in claim 1, it is characterized in that, on the light-emitting face of above-mentioned light guide plate, form the second trickle diffusing structure body that leaves mutually, the length direction of the above-mentioned second trickle diffusing structure body and the straight line almost parallel or the approximate vertical that link the above-mentioned second trickle diffusing structure body and above-mentioned pointolite.
10. lighting device as claimed in claim 1 is characterized in that above-mentioned pointolite has been set up a plurality of, and has formed above-mentioned trickle diffusing structure body accordingly with each light source.
11. as any described lighting device of claim 1～10, it is characterized in that, the light-emitting face of above-mentioned light guide plate or be divided into a plurality of zones with the face of light-emitting face opposition side, at the thickness of the light guide plate in above-mentioned a plurality of zones along with attenuation away from above-mentioned light source.
12. lighting device as claimed in claim 11 is characterized in that, above-mentioned a plurality of zones are divided into and the straight line that links above-mentioned trickle diffusing structure body and above-mentioned pointolite quadrature roughly.
13. lighting device as claimed in claim 11 is characterized in that, the shape of the boundary surface in above-mentioned a plurality of zones is to be the circular arc of approximate centre with above-mentioned pointolite.
14. lighting device as claimed in claim 11 is characterized in that, the formation density of above-mentioned trickle diffusing structure body clips the boundary surface in above-mentioned a plurality of zones and changes discontinuously.
15. a display device possesses: pointolite, will it is characterized in that from the light of above-mentioned pointolite from the light guide plate of light entrance face direct light exit facet and the non-emissive type display element that is arranged on photoirradiated surface one side of above-mentioned light guide plate:
Have a plurality of trickle diffusing structure body that on the face of the opposite side with above-mentioned light-emitting face of above-mentioned light guide plate, forms,
Above-mentioned trickle diffusing structure body is the concave shape to the inner recess of above-mentioned light guide plate, this concave shape has the inclined-plane of light source side, and the direction of light that incides above-mentioned trickle diffusing structure body from above-mentioned pointolite is roughly consistent with the length direction of above-mentioned trickle diffusing structure body
The inclined-plane reflection of above-mentioned light source side is from the light of above-mentioned pointolite.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004150796 | 2004-05-20 | ||
| JP150796/04 | 2004-05-20 | ||
| JP118224/05 | 2005-04-15 |
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| Publication Number | Publication Date |
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| CN1700074A CN1700074A (en) | 2005-11-23 |
| CN100514150C true CN100514150C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100737339A Expired - Fee Related CN100514150C (en) | 2004-05-20 | 2005-05-20 | Illuminator and display device used thereby |
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| Country | Link |
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| JP (2) | JP4865875B2 (en) |
| CN (1) | CN100514150C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922689A (en) * | 2009-08-06 | 2010-12-22 | 友达光电股份有限公司 | Backlight module for reducing light leakage |
| CN103307510A (en) * | 2012-03-15 | 2013-09-18 | 欧姆龙株式会社 | Surface light source device |
| US8827535B2 (en) | 2009-07-10 | 2014-09-09 | Au Optronics Corporation | Backlight module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7876489B2 (en) * | 2006-06-05 | 2011-01-25 | Pixtronix, Inc. | Display apparatus with optical cavities |
| JP2009093143A (en) * | 2007-09-18 | 2009-04-30 | Fujifilm Corp | Liquid crystal device |
| KR20120026451A (en) * | 2010-09-09 | 2012-03-19 | 히다치 가세고교 가부시끼가이샤 | Light guide plate and surface light source device |
| WO2012046441A1 (en) * | 2010-10-06 | 2012-04-12 | 株式会社クラレ | Surface light source element and illuminating device provided with same |
| KR20160013127A (en) * | 2013-06-13 | 2016-02-03 | 가부시키가이샤 구라레 | Illumination apparatus |
| JP6381484B2 (en) * | 2015-05-22 | 2018-08-29 | 三菱電機株式会社 | Surface light source device and display device including the same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04162002A (en) * | 1990-10-25 | 1992-06-05 | Mitsubishi Rayon Co Ltd | Plane light source in edge light system |
| JP3402138B2 (en) * | 1996-09-27 | 2003-04-28 | 株式会社日立製作所 | Liquid crystal display |
| DE69735125T2 (en) * | 1996-10-25 | 2006-09-14 | Omron Corp. | SURFACE LIGHT SOURCE AND LIQUID CRYSTAL DISPLAY, PORTABLE TELEPHONE, AND AN INFORMATION TERMINAL USING THE SURFACE LIGHT SOURCE |
| JPH11231797A (en) * | 1998-02-10 | 1999-08-27 | Omron Corp | Light guide plate for back light device, back light device, and display device using back light device |
| JP3651238B2 (en) * | 1998-02-27 | 2005-05-25 | オムロン株式会社 | Surface light source device |
| JP4387049B2 (en) * | 2000-08-16 | 2009-12-16 | 株式会社エンプラス | Surface light source device and liquid crystal display |
| JP4055056B2 (en) * | 2002-07-19 | 2008-03-05 | ミネベア株式会社 | Surface lighting device |
-
2005
- 2005-05-20 CN CNB2005100737339A patent/CN100514150C/en not_active Expired - Fee Related
-
2010
- 2010-02-02 JP JP2010021562A patent/JP4865875B2/en not_active Expired - Fee Related
- 2010-02-02 JP JP2010021561A patent/JP4739454B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8827535B2 (en) | 2009-07-10 | 2014-09-09 | Au Optronics Corporation | Backlight module |
| CN101922689A (en) * | 2009-08-06 | 2010-12-22 | 友达光电股份有限公司 | Backlight module for reducing light leakage |
| CN101922689B (en) * | 2009-08-06 | 2013-07-24 | 友达光电股份有限公司 | Backlight module for reducing light leakage |
| CN103307510A (en) * | 2012-03-15 | 2013-09-18 | 欧姆龙株式会社 | Surface light source device |
| CN103307510B (en) * | 2012-03-15 | 2015-08-19 | 欧姆龙株式会社 | Planar light source device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4865875B2 (en) | 2012-02-01 |
| JP2010108947A (en) | 2010-05-13 |
| JP4739454B2 (en) | 2011-08-03 |
| CN1700074A (en) | 2005-11-23 |
| JP2010108948A (en) | 2010-05-13 |
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Effective date of registration: 20211021 Address after: 527-b, 5 / F, building 10, yard a 69, Fushi Road, Haidian District, Beijing Patentee after: Beijing seven day science and Technology Service Center (L.P.) Address before: Chiba, Chiba, Japan Patentee before: Seiko Instruments Inc. |
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