CN101321988A - Surface light source and display - Google Patents
Surface light source and display Download PDFInfo
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- CN101321988A CN101321988A CNA2007800004301A CN200780000430A CN101321988A CN 101321988 A CN101321988 A CN 101321988A CN A2007800004301 A CNA2007800004301 A CN A2007800004301A CN 200780000430 A CN200780000430 A CN 200780000430A CN 101321988 A CN101321988 A CN 101321988A
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Abstract
The present invention relates to a surface light source device and a display device. The surface light source device for illuminating a display member of a display has first and second light guide plates stacked with a low-refractive layer interposed therebetween. The side edge on the light entrance side of one light guide plate is on the opposite side to the other, and the light emergence surface of the first light guide plate faces the back of the second light guide plate with a low-refractive layer. In each light guide plate, from the light entrance side to the far end side, a light emergence suppression region, a light emergence gradual increasing region, and a light emergence promoting region are formed. Though each light source group is composed of at least two point light sources outputting lights with different colors, the lights with different colors are mixed in the light emergence suppression region to prevent the output of light with non-uniform color phase from the emergence surface of the second light guide plate.
Description
Technical field
The display unit that the present invention relates to planar light source device and possess this planar light source device is applied to vehicle for example and travels with the planar light mechanism on massaging device, video camera, digital camera, electronic memo, pocket telephone, portable electronic terminal equipment, electronic memo, personal computer and the liquid crystal TV set etc. (for example LCD backboard optical illumination is mediated mechanism) or comprise the display unit of this planar light mechanism.In addition, the present invention also can be applicable to planar light mechanisms such as billboard or comprises on the display unit of this planar light mechanism.
Background technology
In general, in travelling with devices such as massaging device, video camera, digital camera, electronic memo, pocket telephone, portable electronic terminal equipment, electronic memo, personal computer and liquid crystal TV sets, vehicle is equipped with display.In the display of a typical type, adopt LCD panel as display unit, this LCD panel is by the planar light source device illumination of having used LGP.LGP accepts to be disposed at the light that near the primary source in side is supplied with usually.In the past, be extensive use of bar-shaped fluorescent lamp as primary source.Light from fluorescent lamp is supplied with in LGP penetrates gradually from outgoing plane (instrumentation face) in the process of internal communication, and display unit (LCD panel) is thrown light on.
Yet, if use fluorescent lamp, because fluorescent lamp contains mercury, so can strengthen burden when discarded to environment as primary source.In addition, also cause the problem that power consumption is big.And, utilize the colour of LCD panel to be presented at vague generalization, produced demand to high color reprodubility.
So, propose to have the such point source of light of the LED of use to replace fluorescent lamp, and adopted continually as primary source.Especially blue-light-emitting LED after being utilized, is made the led light source element of supplying with white former light to utilize by goodsization.Be referred to as " White LED ".
By primary source being adopted White LED, but realized the planar light source device of high-density installation (not needing converter) with low consumption electric power.Following patent documentation 1 disclosed planar light source device is this example.
On the other hand, in recent years, the good display unit of color reprodubility as plasma display has appearred, and liquid crystal indicator (having used the display unit of LCD panel) between the image display quality had relatively.On liquid crystal indicator, colored display quality (color reprodubility) there has been tighter requirement for this reason.
In order to tackle this requirement, propose to have the method for using a plurality of R (red), G (green), the trichromatic LED of B (indigo plant) to obtain white light.Known this method of utilizing can obtain high color reprodubility than the situation of using White LED.
Use the prior art of this R, G, the trichromatic LED of B to be disclosed in the following patent documentation 2.Figure 15 represents the surface illuminating device 100 according to the prior art (first prior art).The spot light module 104 of the LED104r that surface illuminating device 100 possesses and has R, G, B are of all kinds, 104g, 104b, mixing LGP 101, LGP 102 and reflector 103.
Mix with LGP 101 and will mix and whitening, and penetrate from front end face 106 from each coloured light of spot light module 104.This light utilizes reflector 103 to make the end face 107 of direct of travel change 180 degree and guiding LGP 102.The white light that is directed to end face 107 enters in the LGP 102 from end face 107, then is planar ejaculation from outgoing plane 108, supplies with to liquid crystal board 110.
Yet, in planar light source device 100, the leaded light length of the light that sends from each LED104 is longer, and makes light conducting direction conversion 180 degree of light via the reflecting surface of reflector 103, so the utilization ratio of light reduces easily, be difficult to expect the planar white illumination of high brightness.
In addition, be disclosed in the following patent documentation 3 with the similar in appearance planar light source device (second prior art) of planar light source device that relates to embodiments of the present invention described later.Figure 16 has represented its schematic configuration.As shown in figure 16, planar light source device 200 is overlapping has used two LGPs.Only with regard to this point, planar light source device 200 seems with similar according to planar light source device of the present invention.But, in planar light source device 200, used fluorescent lamp 201 as primary source.In addition, in 204,205 entire scope of the back side of two overlapping LGPs 202,203, be printed with stipple pattern.This just penetrates brightness uniformity in order to make, with by fully mix R, G, the B planar light source device of the present invention 2 that makes its whitening and penetrate of all kinds is compared, structure and effect, effect are different fully.
Patent documentation 1: referring to Japanese kokai publication hei 10-97200 communique
Patent documentation 2: TOHKEMY 2005-276734 communique
Patent documentation 3: Japanese kokai publication hei 8-240721 communique
Summary of the invention
One object of the present invention is to improve planar light source device, makes in the occasion of using at least two different mutually point source of lights of illuminant colour as primary source, can not had the irregular planar light light of form and aspect by these illuminant colours of abundant mixing.In addition, another object of the present invention is to provide a kind of display unit of using the planar light source device after such improvement to carry out high-quality demonstration.
Another object of the present invention is to provide the planar light source device of the planar light light that utilizes above-mentioned improvement acquisition not have the irregular white of form and aspect and use this planar light source device to carry out the display unit of high-quality demonstration.
The present invention at first is applied to planar light source device, and this planar light source device possesses: have first side end face, first outgoing plane and be positioned at first LGP with first back side of the opposite side of this first outgoing plane; Constitute by mutual at least two the different point source of lights of illuminant colour, dispose and supply with the first light source group of first illumination light along above-mentioned first side end face; Have second side end face, second outgoing plane and be positioned at second LGP with second back side of the opposite side of this second outgoing plane; Constitute by mutual at least two the different point source of lights of illuminant colour, dispose and supply with the secondary light source group of second illumination light along above-mentioned second side end face; And the low layer of above-mentioned first LGP of refractive index ratio.
According to a feature of the present invention, above-mentioned first LGP and the above-mentioned second LGP overlay configuration make above-mentioned layer between above-mentioned first outgoing plane and above-mentioned second back side, and above-mentioned first side end face and above-mentioned second side end face are positioned at an opposite side.And, above-mentioned first LGP have inhibition from the light of above-mentioned first illumination light of above-mentioned first outgoing plane penetrate first penetrate the inhibition zone, promote that light from above-mentioned first illumination light of above-mentioned first outgoing plane penetrates first penetrate and promote the zone and connect above-mentioned first to penetrate inhibition zone and above-mentioned first and penetrate and promote first of zone to penetrate cumulative zone.
In addition, above-mentioned second LGP have inhibition from the light of above-mentioned second illumination light of above-mentioned second outgoing plane penetrate second penetrate the inhibition zone, promote that light from above-mentioned second illumination light of above-mentioned second outgoing plane penetrates second penetrate and promote the zone and connect above-mentioned second to penetrate inhibition zone and above-mentioned second and penetrate and promote second of zone to penetrate cumulative zone.
And above-mentioned first penetrates the inhibition zone is positioned at the position of more approaching above-mentioned first side end face than the cumulative zone of above-mentioned first ejaculation, and above-mentioned first ejaculation promotes regional being positioned at than above-mentioned first to penetrate the position of cumulative zone further from above-mentioned first side end face.In addition, above-mentioned second penetrates the inhibition zone is positioned at the position of more approaching above-mentioned second side end face than the cumulative zone of above-mentioned second ejaculation, and above-mentioned second ejaculation promotes regional being positioned at than above-mentioned second to penetrate the position of cumulative zone further from above-mentioned second side end face.
Here, from the only typical white light of the illumination output of above-mentioned second outgoing plane output.In addition, make above-mentioned first LGP for along with the LGP that reduces the wedge-type shape of thickness away from above-mentioned first side end face gradually, make above-mentioned second LGP for along with the LGP that reduces the wedge-type shape of thickness away from above-mentioned second side end face gradually.
Perhaps, as above-mentioned first LGP, employing is penetrated above-mentioned first and is promoted the zone along with the parts that reduce thickness away from above-mentioned first side end face gradually, as above-mentioned second LGP, adopt above-mentioned second and penetrate the promotion zone along with the parts that reduce thickness away from above-mentioned second side end face gradually are also passable.
Have, above-mentioned first LGP is being positioned at end with the opposite side in above-mentioned first side end face by shading again, and above-mentioned second LGP is also passable by shading at the end that is positioned at the opposite side in above-mentioned second side end face.
The present invention also is applied to display unit, and this display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit.According to feature of the present invention, adopt above-mentioned arbitrary planar light source device as planar light source device.
In according to planar light source device of the present invention, because on first LGP, be provided with first at the light incident side of the light of first illumination light and penetrate the inhibition zone, so fully being mixed the back, the major part of first illumination penetrated from first outgoing plane, enter second LGP, and penetrate from second outgoing plane.On the other hand, because on second LGP, be provided with first at the light incident side of the light of second illumination light and penetrate the inhibition zone, penetrated from second outgoing plane so the major part of second illumination fully mixes the back.That is, in first and second penetrates the inhibition zone, form the blend of colors zone of the light mixing of plurality of color.
In addition, be arranged on first on first LGP and penetrate promote the zone and be arranged on second on second LGP to penetrate and promote that the zone is positioned at an opposite side, so the light that penetrates from second outgoing plane is even on the whole.Its result, the color and the intensity of the output illumination light of planar light source device (from the ejaculation light of second outgoing plane) are even on the whole.
If be chosen in the illuminant colour of the point source of light that uses among the first light source group and the secondary light source group,, then utilize planar light source device can obtain the irregular little illumination output light of color and brightness so that generate white light by the mixing of illuminant colour.
These advantages can improve the display quality of the display unit that display unit is thrown light on the illumination of above-mentioned planar light source device output light.Especially be the colored occasion that shows LCD panel at display unit, can realize that high-quality colour shows.
Description of drawings
Fig. 1 is the exploded perspective view that expression relates to the display unit of embodiments of the present invention.
Fig. 2 is along the cutaway view of the display unit of Y direction in Fig. 1.
Fig. 3 (a) is the vertical view of expression display unit shown in Figure 1, is the figure that describes behind dismounting LCD panel (illuminated parts), first and second light control member.(b) be the part vertical view of expression from the same display unit of the admixture of the light of a plurality of LED.
Fig. 4 is the figure of the corresponding ejaculation brightness curve of the major part section shape of the planar light source device equipped with display unit shown in Figure 1 of expression.
Fig. 5 (a) is the part amplification view of the planar light source device shown in presentation graphs 1 to Fig. 3 (a) and (b).(b)～(d) be the part amplification view that illustrates respectively according to four kinds of configurations of the modified example 1 of the planar light source device shown in Fig. 5 (a).
Fig. 6 relates to the fragmentary cross-sectional view of the planar light source device of modified example 2 of the present invention.
Fig. 7 relates to the fragmentary cross-sectional view of the planar light source device of modified example 3 of the present invention.
Fig. 8 relates to the fragmentary cross-sectional view of the planar light source device of modified example 4 of the present invention.
Fig. 9 relates to the fragmentary cross-sectional view of the planar light source device of modified example 5 of the present invention.
Figure 10 (a) relates to the cutaway view of the planar light source device of modified example 7 of the present invention.(b) be the A portion enlarged drawing in (a).(c) be the B portion enlarged drawing in (a).
Figure 11 is expression and the figure of the brightness distribution curve of the corresponding ejaculation light from second LGP of the pattern cross sectional shape of planar light source device that relates to modified example 7.
Figure 12 (a) is in the planar light source device that relates to modified example 8 of the present invention, and imagination does not form the situation of wide-angle mechanism and the vertical view (having omitted the diagram of first LGP, one side) described at the plane of incidence.(b) be the vertical view (having omitted the diagram of first LGP, one side) that explanation relates to the planar light source device of the reference example that compares with modified example 8.(c) relate to the vertical view (having omitted the diagram of first LGP, one side) of the planar light source device of modified example 8.(d) be a part of enlarged drawing of (c).(e) be the figure (figure corresponding) of the alternate manner of expression wide-angle mechanism with (d).
Figure 13 (a) is the figure that amplifies the major part of expression Figure 12 (d).(b) be the cutaway view of the D1 one D1 line in the edge (a).
Figure 14 (a) is the measurement result of modified example 8 being carried out in order to illustrate, and from the second LGP unilateral observation and pattern the vertical view of the planar light source device that relates to modified example 8 described.(b) be the chart that is illustrated in (a) u ' value (coordinate figures of the relevant red-green axle the CIE 1976 UCS chromatic diagrams) that obtains from the determination of colority of the many places of the second LGP central portion.(c) be the chart that is illustrated among Figure 14 (a) v ' value (coordinate figure of the relevant Huang the CIE 1976 UCS chromatic diagrams-indigo plant axle) that obtains from the determination of colority of the many places of the second LGP central portion.(d) be the chart that is illustrated in (a) from the u ' value (coordinate figures of the relevant red-green axle the CIE 1976 UCS chromatic diagrams) that obtains with the determination of colority of the many places of the opposite side end of the plane of incidence of second LGP.(e) be the chart that is illustrated in (a) from the v ' value (coordinate figure of the relevant Huang the CIE 1976 UCS chromatic diagrams-indigo plant axle) that obtains with the determination of colority of the many places of the opposite side end of the plane of incidence of second LGP.
Figure 15 is the cutaway view that expression relates to the planar light source device of first prior art.
Figure 16 is the cutaway view that expression relates to the planar light source device of second prior art.
The specific embodiment
(planar light source device and the structure that possesses its display unit)
The display unit 1 that relates to present embodiment has been shown in Fig. 1 to Fig. 3 (a) and (b).Fig. 1 is the exploded perspective view of expression display unit 1, Fig. 2 is along the cutaway view of Y direction in Fig. 1, Fig. 3 (a) is the vertical view of expression display unit 1, the vertical view of describing behind expression dismounting LCD panel (examples of illuminated parts) 3, first and second light control member 4,5.And Fig. 3 (b) is the part vertical view of expression from the display unit 1 of the admixture of the light of a plurality of LED.
That is, organize LED14a, 14b, 14c along each alternately arrangement of plane of incidence 8 more.In addition, only show three LED14a, 14b, 14c near the two ends of each plane of incidence 8 in Fig. 3 (a), other LED has omitted diagram.As described below, above second LGP 7, the white light that the trichromatic light compositing (mixing) by LED14a, 14b, 14c generates is exported with high evenness from the whole light-emitting area of planar light source device 2.
First LGP 6 possesses end profile 15 at the end that is positioned at a side opposite with the plane of incidence (first side end face) 8.Equally, second LGP 7 possesses end profile 15 at the end that is positioned at a side opposite with the plane of incidence (second side end face) 8.And, second LGP, 7 overlay configuration are on first LGP 6, make that the plane of incidence (second side end face) 8 of second LGP 7 is corresponding with terminal surface (first terminal surface) 15 of first LGP 6, the terminal surface of second LGP 7 (second side end face) 8 is corresponding with the plane of incidence (first terminal surface) 15 of first LGP 6.
(first LGP and second LGP)
First LGP 6 and second LGP 7 are formed by light transmission excellent material such as polymethyl methacrylate (PMMA), Merlon (PC) and cyclic olefine resin materials.The face of a side opposite with the upper surface (second outgoing plane) 17 of second LGP 7 is the back side (second back side) 11, faces mutually with the upper surface (first outgoing plane) 13 of first LGP 6.
Shown in Fig. 1～Fig. 3 (a), first LGP 6 and second LGP 7 have the flat shape of quadrangle form, and along with away from each plane of incidence 8 thickness attenuation.In other words, first LGP 6 and second LGP 7 are the opticses with wedge shape.The thickness of first LGP 6 and second LGP 7 becomes maximum at each plane of incidence 8.In addition, the thickness of first LGP 6 and second LGP 7 becomes minimum at each terminal surface 15.
If like this combination first LGP 6 and second LGP 7, then can make the gauge homogenising of planar light source device 2 and diminish, thereby help realizing the miniaturization of planar light source device 2.
As shown in Figure 2, first outgoing plane 13 provides the inclined plane that relative first back side 16 tilts.Equally, second back side 11 provides another inclined plane that relative second outgoing plane 17 tilts.Between second back side 11 and first outgoing plane 13, there is thin air layer.Much less, the refractive index of air layer is substantially equal to 1.0, and all littler than the refractive index of other any optical material, for example the refractive index than first LGP 6 is also little.
Here, importantly, first LGP 6 and second LGP 7 possess the mechanism of inhibition " light before colour mixture is carried out fully penetrates ".That is, with regard to first LGP 6, in the scope of the given size (L1) of the plane of incidence 8 terminad faces 15, the back side 16 becomes shiny surface.Like this, suppressing light penetrates from first outgoing plane 13.In this sense, this zone at the back side 16 provides and suppresses the ejaculation inhibition zone (first penetrate inhibition zone) 18 of light from the ejaculation of first outgoing plane 13.
Equally, second LGP 7 is in the scope of the given size (L1) of the plane of incidence 8 terminad faces 15, and the back side 11 becomes shiny surface.Like this, suppressing light penetrates from second outgoing plane 17.In this sense, this zone at the back side 11 provides and suppresses the ejaculation inhibition zone (second penetrate inhibition zone) 18 of light from the ejaculation of second outgoing plane 17.
The given size (L1) of each light ejaculation inhibition zone 18,18 is that LED14a～14c of R, G, B fully mixes (it is photochemical to carry out white in the present embodiment) required distance from each plane of incidence 8.Now, the distance from the plane of incidence 8 that begins to mix as if the color with LED14a～14c is made as L1 ', then L1＞L1 '.The value of distance L 1 ' for example can be with estimating in the following formula.
L1’＝P/(2·tanθ)
Shown in Fig. 3 (b), the θ in the following formula is from the extended corner to the incident light of the direction parallel with outgoing plane 13 after the plane of incidence 8 incidents of the ejaculation light of each LED14a, 14b, 14c...... (size of the angular range of the ejaculation intensity more than the half value of intensity is provided).In addition, P is whole-colored LED spacing.Be made as distance between Pb, LED14c-14c when being made as Pc the distance between LED14a-14a being made as distance between Pa, LED14b-14b, if Pa=Pb=Pc, then can make P=Pa (=Pb=Pc).In addition, when there are differences on Pa, Pb, Pc, the maximum that preferably makes Pa, Pb, Pc is P.
Implemented at the plane of incidence 8 or near it to strengthen under the situation of measure of extended corner θ, then can become to make the value of L1 ' littler than the L1 under the situation of not carrying out this research.But, because L1 ' be the distance (from the distance of the plane of incidence 8) at the beginning of the mixing of whole-colored light, so, be used for the given size L1 L1＞L1 ' preferably of the ejaculation inhibition zone 18 of the needed light of abundant white lightization.In general, be adjusted to optimum size according to the gauge of first and second LGP 6,7 or the characteristics of luminescence of LED14a～14c.
Here, length direction (directions X) size with the plane of incidence 8 of first LGP 6 and second LGP 7 is made as L2.So the ejaculation inhibition zone 18,18 of the light of first LGP 6 and second LGP 7 becomes the zone of the area of (L1) * (L2).The zone of the area of (L1 ') in addition, * (L2) becomes light and mixes forefoot area.
Be formed with the ejaculation of having left the plane of incidence (first side end face) 8 at the back side 16 of first LGP 6 and promote zone (first penetrates the promotion zone) 21.In addition, promote to be formed with between the zone 21 the cumulative zone of ejaculation (the cumulative zone of first ejaculation) 20 in the first ejaculation inhibition zone 18 and first ejaculation.Equally, be formed with the ejaculation of having left the plane of incidence (second side end face) 8 at the back side 11 of second LGP 7 and promote zone (second penetrates the promotion zone) 21.In addition, promote to be formed with between the zone 21 the cumulative zone of ejaculation (the cumulative zone of second ejaculation) 20 in the second ejaculation inhibition zone 18 and second ejaculation.
Each penetrates and promotes zone 21 scopes that are formed at from each end profile 15 to given size L1.Its result, as shown in Figure 2, formation first penetrates inhibition zone 18 and second ejaculation promotes zone 21 to overlap, and the positions relation that promotion zone 21 overlaps is penetrated in the second ejaculation inhibition zone 18 and first.And first and second penetrates the cumulative regional 20 positions relations that also constitute to overlap.
Penetrate promotion zone 21 at each and be formed with the ejaculations promotion mechanism of promotion from outgoing plane 13 or 17 ejaculations.Promote mechanism as penetrating, have the microspike such as micro prisms shape projection, sandblast face, pyrometric cone or circular cone of fold face, ridge shape or small recess etc. matsurface, have the ink printing face of light diffusing characteristic diffuser etc., usually, so long as promote light to get final product from outgoing plane 13 or 17 mechanisms that penetrate.
Each penetrates cumulative regional 20 is to connect " zone of intermediateness " of respectively penetrating inhibition zone 18 and each ejaculation inhibition zone 21, is along with increase the zone of penetrating the promotion ability gradually away from each plane of incidence 8.Each penetrate cumulative regional 20 and each penetrate the border of inhibition zone 18 and respectively penetrate cumulative regional 20 and each penetrate the border that promotes zone 21, it is desirable to, penetrate and suppress or penetrate the ability that promotes sharply not change.
In other words, each penetrates cumulative regional 20 along with lose the inhibition ability that penetrates gradually away from each plane of incidence 8, and it is high more that approaching more ejaculation promotes zone 21 to penetrate the promotion ability.
Therefore, penetrate the formation density that cumulative regional 20, above-mentioned ejaculation promotes mechanism forms gently by dredging to thickly cumulative at each.
Promote zone 21 and each to penetrate cumulative regional 20 border in each ejaculation, the formation density that penetrates promotion mechanism had better not discontinuously change (that is staged method).In addition, penetrate the formation density that cumulative regional 20 ejaculation promotes mechanism at each, from each penetrate cumulative regional 20 and each border that penetrate to promote zone 21 to each penetrate cumulative regional 20 and each border of penetrating inhibition zone 18 reduce gradually, each penetrate cumulative regional 20 and each border of penetrating inhibition zone 18 become 0.
In addition, being formed at each ejaculation that penetrate to promote zone 21 promotes mechanism and is formed at respectively to penetrate cumulative regional 20 ejaculation and promote mechanism, for visibility on the planar light source device 2 and the short of inharmonious sense of ejaculation brightness, also can be different types of mechanism (for example, the micro prisms shape projection of fold face, ridge shape).
(first light suppresses parts/second light and suppresses parts)
First and second light suppresses parts 4,5 and forms the film shape by the good resin material of light transmission (for example, PET (PET), PMMA, PC).To shown in Figure 2, the flat shape of each light control member 4,5 and the outgoing plane 17 of second LGP 7 are roughly the same, are quadrangle form as Fig. 1.
In the present embodiment, first light control member 4 has the function of diffused light, and second light control member 5 has the function of the direct of travel of revising light.
At least the one side of medial surface of first light control member 4 (face relative with outgoing plane 17) and lateral surface (face relative with second light control member 5) be a matsurface, spreads from the light of outgoing plane 17 ejaculations and to second light control member with this and supplies with.In addition, because the diffusion that this matsurface brought is difficult to recognize the ejaculation that is formed at first LGP 6 and second LGP 7 from the outer side-looking of LCD panel 3 and promotes mechanism's (matsurface etc.).
As Fig. 1 to shown in Figure 2, second its lateral surface of tabula rasa control assembly (face relative with LCD panel 3; Above) prism facets is provided.This light control member is called prismatic lens up.On prism facets, shape ground, ridge is formed with the prism-like projection 22 that cross section that the length direction (directions X) of a plurality of each plane of incidence 8,8 along first LGP 6 and second LGP 7 extends is the general triangular shape continuously.Second light control member 5 utilizes well-known function, make the frontal of the direct of travel deflection of the light that is spread by first light control member 4, and will increase at the back side of LCD panel 3 with light vertical or that approach vertical angle incident near outgoing plane 17.
Secondly, with reference to Fig. 4 the light characteristic from the ejaculation light of the outgoing plane 17 of planar light source device 2 is described.In Fig. 4, described luminosity response (solid line A, solid line B and dotted line C) under three lighting conditions (first lighting condition～the 3rd lighting condition).The lighting condition that obtains each curve A, B, C is as follows.
Solid line A: first condition=only make formation carry out the bright lamp of LED14a～14c (only supplying with second illumination light) of the spot light unit 10 of light supply to second LGP 7.
Solid line B: first lighting condition=only make formation carry out the bright lamp of LED14a～14c (only supplying with first illumination light) of the spot light unit 10 of light supply to first LGP 6.
Dotted line C: the bright lamp of LED14a～14c (supplying with first illumination light and second illumination light) that makes two spot light unit 10,10.
Can understand following situation from Fig. 4.
(1) shown in solid line A, do not penetrate basically in the ejaculation inhibition zone of second LGP 7 (second penetrates the inhibition zone) 18.That is, the light ejaculation from second outgoing plane 17 in the ejaculation inhibition zone of second LGP 7 (second penetrates the inhibition zone) 18, the second illumination light is suppressed.Penetrating cumulative zone (second penetrates cumulative zone) 20,, penetrating brightness increase gradually gently along with away from the second ejaculation inhibition zone 18.Penetrate promotion zone 21 if enter second, then penetrate brightness and be roughly necessarily (side end face 15 towards end reduces slightly).
(2) shape described of solid line B is a benchmark with the center line (CL) with the direction of the plane of incidence 8 quadratures of first LGP 6, with solid line A left-right symmetry roughly.That is, the light ejaculation from first outgoing plane 13 in the ejaculation inhibition zone of first LGP 6 (first penetrates the inhibition zone) 18, the first illumination light is suppressed.Penetrating cumulative zone (first penetrates cumulative zone) 20,, penetrating brightness increase gradually gently along with away from the first ejaculation inhibition zone 18.Penetrate promotion zone 21 if enter first, then penetrate brightness and be roughly necessarily.
(3) shape described of dotted line C becomes the synthetic shape of adding up with solid line A and solid line B.If, then be C=A+B with the symbol performance.Though expressing, dotted line C penetrates brightness the highest with the center line (CL) of the direction (Y direction) of the plane of incidence 8 quadratures of first LGP 6, after this towards each terminal side end face 15 its penetrate the tendency that brightness reduce slightly, but, but can obtain roughly certain ejaculation brightness on the whole.
Like this, in the present embodiment, can in wider scope, obtain to penetrate uniformly brightness.In addition, compare the utilization ratio height of light with above-mentioned prior art (planar light source device 100).Reason is, in planar light source device 100, because at the inside leaded light of mixed light-guiding plate 101 and LGP 102, thereby leaded light length compares with the occasion of planar light source device 2 and become big, thus the easy step-down of the utilization ratio of light.Also have, as shown in figure 15,180 degree changes of the direct of travel of the light by reflector 103 also make the utilization ratio of light reduce.In planar light source device 2, do not need 180 changes of the direct of travel of the light by this reflector.
Also have,, under the light-emitting area that makes planar light source device 2 condition same as the prior art, can reduce thickness, dispose a pair of (two) spot light unit 10 according to present embodiment.Thereby, realize the miniaturization of planar light source device and display unit easily, simultaneously, can improve the ejaculation brightness of the light (being white light in the present embodiment) that the mixing (colour mixture) of the illuminant colour by LED group obtains.
Have again, according to present embodiment, the part that the light of first illumination light is concentrated is penetrated the effect of inhibition zone 18 by near first the plane of incidence 8 that is formed at first LGP 6, after illuminant colour fully mixes, penetrate cumulative area surface 20 and first from first and penetrate outgoing plane 13 ejaculations that promote area surface 21 tops, and supply with to second LGP 7.The more part of this light penetrates from outgoing plane 17.Be referred to as first and penetrate light (from the ejaculation light of first illumination light).
On the other hand, the part that the light of second illumination light is concentrated is penetrated the effect of inhibition zone 18 by near second the plane of incidence 8 that is formed at second LGP 6, after illuminant colour fully mixes, penetrate cumulative area surface 20 and second from second and penetrate outgoing plane 17 ejaculations that promote area surface 21 tops.Be referred to as second and penetrate light (from the ejaculation light of second illumination light).
As a result, the first ejaculation light and second penetrates light from outgoing plane 17 ejaculations.Therefore, first penetrate light and second and penetrate light any all is difficult to become the light of undermixing.In the occasion of present embodiment, owing to generate white light by colour mixture, so, suppressed the irregular uniform white light of form and aspect from outgoing plane 17 ejaculations.
In addition, as mentioned above, though known have and the planar light source device 2 that relates to present embodiment similar planar light source device (second prior art) in appearance,, structure and effect, effect are different fully with planar light source device 2.
(modified example 1)
Fig. 5 (a) is the part amplification view of Fig. 1 to planar light source device 2 shown in Figure 3.Fig. 5 (b)～Fig. 5 (d) is the part amplification view that illustrates respectively according to three kinds of configurations of the modified example 1 of the planar light source device 2 shown in Fig. 5 (a).In addition, for convenience of explanation, in Fig. 5 (a)～(d), the local plane of incidence 8 one sides of amplifying second LGP 7 of having described planar light source device 2.
With reference to Fig. 5 (b), (c), dispose the frame 23 of the spot light unit 10 of supplying with second illumination light, in its lower end one side, be formed with whole protection board 24 that closely is connected and carries out shading with the terminal surface 15 of first LGP 6.Can prevent that thus light from sewing and incident in first LGP from the terminal surface 15 of first LGP 6.In addition, frame 23 can be plastic products or metallic article.
In addition, though not shown, in the same way in upper end one side of the frame 23 of the spot light unit 10 of supplying with first illumination light, be formed with whole protection board 24 (with reference to Fig. 2) that closely is connected and carries out shading with the terminal surface 15 of second LGP 7.Can prevent that thus light from sewing and incident in second LGP from the terminal surface 15 of second LGP 7.
In addition, remove the protection board 24 that possesses frame 23 among Fig. 5 (c), replace it and make symmetric shape up and down such shown in Fig. 5 (d), it is also passable to clamp the plane of incidence 8 with the eaves portion 25,25 of frame 23.Can prevent also that in this occasion light from entering in LGP 6 or 7 via terminal surface 15.
According to modified example 1, avoided penetrating outgoing plane 13 and 17 light that the penetrate (light after the abundant colour mixture that promotes regional 21 tops from first and second; Be white light in the present embodiment) in, add the light (from the not abundant light of colour mixture of terminal surface 15 incidents) of unnecessary color.Therefore, can penetrate mixed light (being white light the present embodiment) more uniformly from outgoing plane 17.
In addition, in this modified example 1, do not form upper end one side of protection board 24 of the frame 23 of spot light unit 10, with the upper end butt (Fig. 5 (b)) of the plane of incidence 8 of second LGP 7, perhaps, make near the outgoing plane 17 the plane of incidence 8 of eaves portion 25 and second LGP 7 closely engage (hook).
In addition, also can be with the structure applications of the frame 23 shown in Fig. 5 (a) and (b), (c) in the frame of the not shown spot light unit of first LGP 6.
(modified example 2)
Fig. 6 relates to the partial sectional view of the modified example of the planar light source device 2 shown in Fig. 1 to Fig. 3 (a) and (b).With reference to Fig. 6, the terminal surface 15 of first LGP 6 is positioned at than the plane of incidence 8 of second LGP 7 also to the Y direction position of indentation a little.And, make second illumination light and directly do not enter in first LGP 6 from the terminal surface 15 of first LGP 6.Also have, though not shown, the terminal surface 15 of second LGP 7 is positioned at than the plane of incidence 8 of first LGP 6 also to the Y direction position of indentation a little.Like this, making first illumination light does not directly enter in second LGP 7 from the terminal surface 15 of second LGP 7.Even in modified example 2, also can expect effect and the effect same with modified example 1.
(modified example 3)
Fig. 7 is the figure that the modified example 3 to the planar light source device 2 shown in Fig. 1 to Fig. 3 (a) and (b) describes.With reference to Fig. 7, first LGP 6 and second LGP 7 of planar light source device 2 have rectangular cross sectional shape, and extend in parallel to each other at the outgoing plane 13 and the back side 16, and extend abreast at the outgoing plane 17 and the back side 11.Like this, the gauge of area source 2 increases.But, near the ejaculation of the light of the colour mixture deficiency (being the white light deficiency in the present embodiment) the plane of incidence 8 of first LGP 6 and second LGP 7 can be more effectively suppressed, the ejaculation of the light of colour mixture (being whitening in the present embodiment) more equably can be expected.
(modified example 4)
Fig. 8 is the figure that the modified example 4 to the planar light source device 2 shown in Fig. 1 to Fig. 3 (a) and (b) describes.With reference to Fig. 8, the outgoing plane 13,17 of the ejaculation inhibition zone 18 of the light of first LGP 6 and second LGP 7 and the back side 16,11 form respectively abreast.First LGP 6 and second LGP 7 each penetrate cumulative regional 20 and each penetrate to promote zone 21 along with reducing thickness gradually away from each plane of incidence 8.And, make the angle of inclination at the back side 16,11 of the formation wedge-type shape of first LGP 6 and second LGP 7 become big in the part that approaches terminal surface 15.Utilize the wedge-type shape of this part, make have light quantity of light emission a little close the plane of incidence 8 of first LGP 6 of not enough tendency the position and near how many increases of locational quantity of light emission of terminal surface 15.Even in the planar light source device 2 of this modified example 4, also can obtain effect and the effect same with above-mentioned each planar light source device 2.
(modified example 5)
Fig. 9 is the figure that the modified example 5 to the planar light source device 2 shown in Fig. 1 to Fig. 3 (a) and (b) describes.With reference to Fig. 9, respectively penetrating of the light of first LGP 6 and second LGP 7 cumulative regional 20 implemented modification.At first, the cumulative zone of the ejaculation of first LGP (first penetrate cumulative zone) 20 is divided into two wedge shape zones (cross section is a triangle) by the oblique dividing line 26 of the end (on outgoing plane 13) from the end of the plane of incidence 8 one sides (overleaf 16 on) to terminal surface 15 1 sides.In these two wedge shape zones, in Fig. 9, sneaked into a plurality of light diffusing particles in the wedge shape zone of next side, in the wedge shape zone of a last side, do not sneak into light diffusing particles.
On the other hand, the cumulative zone of the ejaculation of second LGP (second penetrate cumulative zone) 20 is divided into two wedge shape zones (cross section is a triangle) by the oblique dividing line 25 of the end (on outgoing plane 17) from the end of the plane of incidence 8 one sides (overleaf 11 on) to terminal surface 15 1 sides.In these two wedge shape zones, in Fig. 9, sneaked into a plurality of light diffusing particles in the wedge shape zone of next side, in the wedge shape zone of a last side, do not sneak into light diffusing particles.Also have, the motherboard (matrix material) of first LGP and second LGP is transparent resin.In addition, as light diffusing particles, can use the particulate of the refractive index material different with this resin.
In this modified example 5, the light ability at random in cumulative regional 20 of respectively penetrating of first LGP 6 and second LGP 7 penetrates inhibition zone 18 and penetrates and promote zone 21 to increase gradually from each to each, and thereupon, penetrating brightness also increases.Also have, in modified example 5, the back side 16,11 can be the even surface same with penetrating inhibition zone 18 penetrating cumulative regional 20 interval corresponding to each.
(modified example 6)
In each example so far, as the mutually different point source of light of illuminant colour, illustration LED14a, 14b, the mode of 14c of each primary colors of use R (red), G (green), B (indigo plant).But these do not limit the present invention.For example, also can replace LED14a, 14b, the 14c of each primary colors and adopt in the toning of illuminant colour how many a plurality of white point source of lights devious (White LED) are arranged.That is, how many White LEDs of market sale has deviation as a rule in toning.For example be to have red white light, have blue white light, have green white light, have yellow white light etc.In this case, for example, use the white light LED that optionally selects even replace the white LEDs 14a～14c of primary colors, by above-mentioned colour mixture effect (fully penetrating after the colour mixture), the deviation of toning is also not obvious.
Relative therewith, prior art makes that by selecting the LED (White LED that for example has blue white light) that uses specific toning the deviation of toning is not obvious.But, this labour who selects operation need be a large amount of.If adopt the present invention, even then just use a plurality of point source of lights (for example White LED) that have deviation in the toning of illuminant colour without as described above selecting, the deviation of toning can obviously not changed yet.
(modified example 7)
Figure 10 (a) relates to the cutaway view of the planar light source device 2 of modified example 7, and Figure 10 (b) is the A portion enlarged drawing among Figure 10 (a).In addition, Figure 10 (c) is the B portion enlarged drawing among Figure 10 (a).Also have, Figure 11 is expression and the figure of the brightness distribution curve of the corresponding ejaculation light from second LGP 7 of the pattern cross sectional shape of the planar light source device that relates to modified example 7.
With reference to these figure, the spot light unit 10 that is made of a plurality of LED14 is along the plane of incidence 8 configurations of first LGP 6 and second LGP 7.According to the feature of modified example 7, near the upper end of the plane of incidence 8 of each LGP 6,7, be formed with first reflecting surface 30,31, near the lower end, be formed with second reflecting surface 32,33.
Shown in Figure 10 (b), parallel with the back side 16 relatively imaginary line 34 of reflecting surface 30,32 provides formation to be respectively the inclined plane of δ angle.But the inclination of the inclination of reflecting surface 30 and reflecting surface 32 is reciprocal, forms first LGP 6 along with increase thickness gradually away from the plane of incidence 8.
On the other hand, shown in Figure 10 (c), also relatively parallel with outgoing plane 17 imaginary line 35 of reflecting surface 31,33 provides formation to be respectively the inclined plane of δ angle.The inclination of the inclination of reflecting surface 31 and reflecting surface 33 is reciprocal, forms second LGP 7 along with increase thickness gradually away from the plane of incidence 8.
In this example, shown in Figure 10 (a) and (b), first LGP 6 is the scope that is formed with first reflecting surface 30 and second reflecting surface 32 (only leaving the scope of the position of given size M1), along with the arrow X1 direction along Figure 10 (a) increases thickness of slab gradually away from the plane of incidence 8 from the plane of incidence 8.In addition, from the position that first reflecting surface 30 and second reflecting surface 32 disappear, along with towards the arrow X1 of Figure 10 (a) direction, thickness of slab reduces gradually.
On the other hand, shown in Figure 10 (a), (c), second LGP 7 is the scope that is formed with first reflecting surface 31 and second reflecting surface 33 (only leaving the scope of the position of given size M1), along with the arrow X2 direction along Figure 10 (a) increases thickness of slab gradually away from the plane of incidence 8 from the plane of incidence 8.In addition, from the position that first reflecting surface 31 and second reflecting surface 33 disappear, along with towards the arrow X2 of Figure 10 (a) direction, thickness of slab reduces gradually.
In this modified example 7, owing to be formed with first reflecting surface 30,31 and second reflecting surface 32,33, so, the internal communication light of propagating in each LGP 6,7 is on these reflectings surface during internal reflection, direct of travel after the internal reflection is compared with the situation that does not have these reflectings surface (reciprocal inclined plane) (with reference to Fig. 2 (a)), approaches the direction parallel with the back side 16 or outgoing plane 17.
In Figure 10 (b), the Ha illustration does not have the direct of travel of internal reflected light of the occasion of reflecting surface 30,32, and there is the direct of travel of the internal reflected light in the modified example 7 of reflecting surface 30,32 in the Hb illustration.In addition, in Figure 10 (c), the Ha illustration does not have the direct of travel of internal reflected light of the occasion of reflecting surface 31,33, and there is the direct of travel of the internal reflected light in the modified example 7 of reflecting surface 31,33 in the Hb illustration.
Much less, Hb more is difficult to deviate from from LGP 6 or 7 than Ha.Therefore, the ejaculation from outgoing plane 13 or outgoing plane 17 (penetrating naturally) that each penetrates in the inhibition zone 18 can suppress in modified example 7 more effectively.
Modified example 7 is suitable for LGP 6,7 and is the occasion of wedge shape (with reference to Fig. 2 (a)).Now, the angle of inclination at the back side 11 of the angle of inclination of the outgoing plane 13 of first LGP 6 and second LGP 7 all is made as α, when then α is big (steeper inclination), especially the advantage of modified example 7 is brought into play.
Promptly, when inclined angle alpha is big, the internal reflection of carrying out repeatedly in internal reflection of carrying out repeatedly in the outgoing plane 13 and the back side 16 and outgoing plane 17 and the back side 11 causes surplus near each plane of incidence 8, even the danger of ejaculation naturally that causes from outgoing plane 13 or outgoing plane 17 is also arranged penetrating inhibition zone 18.This is because near the plane of incidence 8, the inside incidence angle of outgoing plane 13 or outgoing plane 17 is easy to reach below the critical angle relatively.
As described above, by using this modified example 7, the internal communication light that can suppress LGP 6,7 is near the plane of incidence 8, to outgoing plane 13 or outgoing plane 17 phenomenon with the inner incident of inside incidence angle below the critical angle.Its result, each penetrates inhibition zone 18 and brings into play function more well, can suppress the fully mixed preceding ejaculation of illuminant colour, and form and aspect are irregular more not obvious.
Also have, in Figure 10 (b), (c), record numerical value in the lump.These numerical value are the examples for understanding to this modified example being more prone to and representing.Shown in Figure 10 (b), (c), it is that 2.53mm, δ are that 4 °, M1 are that 3mm ground forms reflecting surface 30～33 that first LGP 6 and second LGP 7 make the thickness of slab of the plane of incidence 8.
These numerical value are always illustration, preferably set optimal values according to the various design conditions of the light-emitting area of each LGP 6,7 etc.
(modified example 8)
Figure 12 (a) is in the planar light source device 2 that relates to modified example 8, and imagination does not form the situation of wide-angle mechanism and the vertical view described at the plane of incidence, and first LGP, 6 one sides have been omitted diagram.Figure 12 (b) is the vertical view that explanation relates to the planar light source device 2 of the reference example that compares with modified example 8, and first LGP, 6 one sides have been omitted diagram.In addition, Figure 12 (c) relates to the vertical view of the planar light source device 2 of modified example 8, and first LGP, 6 one sides have been omitted diagram.Also having Figure 12 (d) is the partial enlarged drawing of Figure 12 (c).In addition, Figure 12 (e) is the figure (with the corresponding figure of Figure 12 (d)) of the alternate manner of expression wide-angle mechanism.
Also have, Figure 13 (a) is the figure that amplifies the pith of expression Figure 12 (d), and Figure 13 (b) is the cutaway view along the D1-D1 line among Figure 13 (a).
With reference to Figure 12 (a), there is shown the planar light source device 2 that on the plane of incidence 8 of second LGP 7, does not form wide-angle mechanism, that is, show the enforcement modification planar light source device 2 before that relates to sex change example 8.
With reference to Figure 12 (b), the plane of incidence 8 of second LGP 7 be formed with LED14 with corresponding one to one wide-angle mechanism 40.With reference to Figure 12 (c), the mode of facing mutually with the LED14 with the both ends that are arranged in a plurality of LED14 that constitute spot light unit 10 disposes wide-angle mechanism 40.In Figure 12 (d), amplify the wide-angle mechanism 40 that has represented among Figure 12 (c).
In addition, Figure 12 (e) illustration with the wide-angle mechanism 40 of wide-angle mechanism 40 different structures of Figure 12 (d).
In the example shown in Figure 12 (c), the plane of incidence 8 of second LGP 7 is disposing wide-angle mechanism 40 with the corresponding part of LED14 that is disposed on its length direction both ends.By this wide-angle mechanism 40, from the light H ' of LED14 leaded light as follows: behind the inside of inciding second LGP 7, though by the length direction expansion (with reference to the light H of Figure 13 (a)) of the plane of incidence 8, do not expand (do not go up at the ε of Figure 13 (b) and change) in the thickness of slab direction of second LGP 7 partially.
As the wide-angle mechanism 40 of the plane of incidence 8, can adopt flat shape is roughly circular-arc recess 41 (with reference to Figure 12 (d)), and perhaps, flat shape is a plurality of continuous matsurfaces 42 of the microspike of general triangular (with reference to Figure 12 (e)) etc.Formation forms and is orthogonal to outgoing plane 17 quadratures (with reference to Figure 13 (b)) of the plane of incidence 8 as the side of the microspike of the recess 41 of wide-angle mechanism 40 and matsurface 42.
In order to compare, the planar light source device 2 that the plane of incidence 8 at second LGP 7 does not form any wide-angle mechanism 40 is studied with reference to Figure 12 (a).
In planar light source device shown in Figure 12 2, by from the ejaculation profile of each LED14 that constitutes spot light unit 10 or the aligning method of these LED14, be difficult in the inside of second LGP 7 mix with light from other LED14 from the light of the LED14 at the length direction both ends of the plane of incidence 8 that is disposed at second LGP 7.Its result, the colour mixture (for example whitening) of the ejaculation light of length direction both ends one side of the plane of incidence 8 is insufficient easily.
On the other hand, according to modified example 8, from the light of the LED14 of both ends one side of the plane of incidence 8 that is disposed at second LGP 7, by wide-angle mechanism 40 to second LGP 7 expand significantly by the length direction of the plane of incidence 8 partially and by leaded light (with reference to Figure 13 (a)).Therefore, can with the light colour mixture in wider scope from other LED14, reduce on the inequality of distribution of color favourable.
Secondly, Figure 14 (a) be for measurement result that modification 8 is carried out is described from the second LGP unilateral observation and pattern describe to relate to the vertical view of the planar light source device 2 of modified example 8.Measurement result uses the UCS chromatic diagram according to specification CIE 1976 to be illustrated among Figure 14 (b)～Figure 14 (c).The expression of each figure thes contents are as follows.
Figure 14 (b) is the chart that is illustrated among Figure 14 (a) u ' value (coordinate figures of the relevant red-green axle in the CIE 1976 UCS chromatic diagrams) of the central portion many places of second LGP 7 being carried out determination of colority and obtaining.
Figure 14 (c) is the chart that is illustrated among Figure 14 (a) v ' value (coordinate figure of the relevant Huang in the CIE 1976 UCS chromatic diagrams-indigo plant axle) of the central portion many places of second LGP 7 being carried out determination of colority and obtaining.
Figure 14 (d) is the chart that is illustrated among Figure 14 (a) u ' value (coordinate figures of the relevant red-green axle in the CIE 1976 UCS chromatic diagrams) that obtains carrying out determination of colority with the many places, end of the plane of incidence 8 opposite sides of second LGP 7.
Figure 14 (e) is the chart that is illustrated among Figure 14 (a) v ' value (coordinate figure of the relevant Huang in the CIE 1976 UCS chromatic diagrams-indigo plant axle) that obtains carrying out determination of colority with the many places, end of the plane of incidence 8 opposite sides of second LGP 7.
In addition, the transverse axis of Figure 14 (b)～Figure 14 (e) is represented the position on the width of second LGP 7 parallel with the plane of incidence 8.In addition, in these Figure 14 (b)～Figure 14 (e), dotted line and ● be illustrated in U ', the V ' of the planar light source device 2 (with reference to Figure 12 (a)) that does not form recess 41 on the plane of incidence 8.In addition, chain-dotted line and ■ are illustrated on the plane of incidence 8 corresponding with each LED14 and form U ', the V ' of the planar light source device 2 (with reference to Figure 12 (b)) of recess 41.Also have, solid line and ▲ expression relates to U ', the V ' of the planar light source device 2 (with reference to Figure 12 (c)) of this modified example.
Shown in Figure 14 (b)～Figure 14 (e), according to the planar light source device 2 that relates to this modified example (with reference to Figure 12 (c)), with the plane of incidence 8 for the occasion (with reference to Figure 12 (a)) on plane with on the plane of incidence 8, compare with whole corresponding occasions (with reference to Figure 12 (b)) that forms recess 41 of LED10, can be suppressed to the colour difference that is parallel on the cross section of the plane of incidence 8 very little.
In addition, be that example is illustrated though relate to the planar light source device 2 of this modified example with second LGP, 7 one sides, also can similarly be applied to first LGP, one side.In this occasion, be formed at the plane of incidence 8 of first LGP 6 with the corresponding wide-angle mechanism 40 of LED among a plurality of LED14 of the plane of incidence 8 relative configurations of first LGP 6 with both ends.
(other modified example)
More than Shuo Ming embodiment and each modified example are the example according to mode of the present invention.And also allow for example modification as following narration in the present invention.
(A) also second light control member 5 can be changed to prismatic lens down by prismatic lens up.The face (medial surface) of its side of facing mutually with first light control member 4 of prismatic lens possesses a plurality of prism-like projections down.
(B) outside of the prismatic lens down that also can adopt in above-mentioned (A) disposes the 3rd light control member (prismatic lens up), and the 3rd light control member is formed with along the prism-like projection of extending with the direction of the prism-like projection quadrature of prismatic lens down.
Generally speaking, for the prism piece number of configuration, the bearing of trend of prism-like projection, the shape of prism-like projection, can suitably change according to the desired characteristics of luminescence on the planar light source device 2.According to circumstances also can omit the configuration of prismatic lens.
(C) outgoing plane 13 1 sides at first LGP 6 also can dispose the polarisation separate sheet as required.This occasion is utilized the polarisation separate sheet, can only required polarized component be utilized as penetrating light.
(D) in above-mentioned embodiment and modified example, illustration first LGP 6 and second LGP 7 form the mode that promotes mechanism that penetrates in its back side 16,11 1 sides.But this does not limit the present invention.For example, also can replace the back side 16 and on outgoing plane 13, form ejaculation promotion mechanism's (for example matsurface).Equally, also can replace the back side 11 and on outgoing plane 17, form ejaculation promotion mechanism's (for example matsurface).
(E) in above-mentioned embodiment and modified example, illustration as spot light unit 10, the many groups of configuration R, G, each LED14a, the 14b of B, the modes of 14c.But this does not limit the present invention.For example, also can suitably use the LED of R, G, B color in addition.In the ordinary course of things, the illuminant colour that is made up is selected according to the hope look of the light that penetrates from outgoing plane 17.
As a rule, as illustrated in above-mentioned embodiment and the modified example, the hope look of the light that penetrates from outgoing plane 17 is a white light.
In this occasion, select the combination of the first light source group and secondary light source group's point source of light, so that generate white light by colour mixture.R, G are sent in use, the luminous LED14a～14c of B primary colors is its typical example.As everyone knows, colored demonstration utilizes white light with the back lighting of LCD plate.
(F) reflector plate 12 can omit.For example, in the good occasion of shell inner face light reflective of folding and unfolding planar light source device 2, can replace reflector plate 12 and utilize the shell inner face.
(G), can use with the posture beyond the posture illustrated in above-mentioned embodiment and the modified example according to planar light source device 2 of the present invention or display unit 1.In other words, the performance up and down in the above-mentioned embodiment and the explanation of modified example is the performance in order to be easy to illustrate.For example, also can export illumination light downwards, and be disposed at the LCD panel 3 of the below of planar light source device 2 with this illumination light back lighting from planar light source device 2.
Claims (12)
1. planar light source device possesses: have first side end face, first outgoing plane and be positioned at first LGP with first back side of the opposite side of this first outgoing plane;
Constitute by mutual at least two the different point source of lights of illuminant colour, dispose and supply with the first light source group of first illumination light along above-mentioned first side end face;
Have second side end face, second outgoing plane and be positioned at second LGP with second back side of the opposite side of this second outgoing plane;
Constitute by mutual at least two the different point source of lights of illuminant colour, dispose and supply with the secondary light source group of second illumination light along above-mentioned second side end face; And
The low layer of above-mentioned first LGP of refractive index ratio is characterized in that,
Above-mentioned first LGP and the above-mentioned second LGP overlay configuration make above-mentioned layer between above-mentioned first outgoing plane and above-mentioned second back side, and above-mentioned first side end face and above-mentioned second side end face be positioned at an opposite side,
Above-mentioned first LGP have inhibition from the light of above-mentioned first illumination light of above-mentioned first outgoing plane penetrate first penetrate the inhibition zone, promote that light from above-mentioned first illumination light of above-mentioned first outgoing plane penetrates first penetrate and promote the zone and connect above-mentioned first to penetrate inhibition zone and above-mentioned first and penetrate and promote first of zone to penetrate cumulative zone
Above-mentioned second LGP have inhibition from the light of above-mentioned second illumination light of above-mentioned second outgoing plane penetrate second penetrate the inhibition zone, promote that light from above-mentioned second illumination light of above-mentioned second outgoing plane penetrates second penetrate and promote the zone and connect above-mentioned second to penetrate inhibition zone and above-mentioned second and penetrate and promote second of zone to penetrate cumulative zone
Above-mentioned first penetrates the inhibition zone is positioned at than above-mentioned first and penetrates the position that above-mentioned first side end face is more approached in cumulative zone, and above-mentioned first penetrate and promote the zone to be positioned at than above-mentioned first to penetrate the position of cumulative zone further from above-mentioned first side end face,
Above-mentioned second penetrates the inhibition zone is positioned at the position of more approaching above-mentioned second side end face than the cumulative zone of above-mentioned second ejaculation, and above-mentioned second ejaculation promotes regional being positioned at than above-mentioned second to penetrate the position of cumulative zone further from above-mentioned second side end face.
2. planar light source device according to claim 1 is characterized in that,
Export only white light from the illumination of above-mentioned second outgoing plane output.
3. planar light source device according to claim 1 and 2 is characterized in that,
Above-mentioned first LGP is along with the LGP that reduces the wedge-type shape of thickness away from above-mentioned first side end face gradually,
Above-mentioned second LGP is along with the LGP that reduces the wedge-type shape of thickness away from above-mentioned second side end face gradually.
4. planar light source device according to claim 1 and 2 is characterized in that,
Above-mentioned first LGP penetrate to promote the zone above-mentioned first, along with reducing thickness gradually away from above-mentioned first side end face,
Above-mentioned second LGP penetrates above-mentioned second and promotes the zone, along with reducing thickness gradually away from above-mentioned second side end face.
5. planar light source device according to claim 1 and 2 is characterized in that,
Above-mentioned first LGP is being positioned at end with the opposite side in above-mentioned first side end face by shading,
Above-mentioned second LGP is being positioned at end with the opposite side in above-mentioned second side end face by shading.
6. planar light source device according to claim 3 is characterized in that,
Above-mentioned first LGP is being positioned at end with the opposite side in above-mentioned first side end face by shading,
Above-mentioned second LGP is being positioned at end with the opposite side in above-mentioned second side end face by shading.
7. planar light source device according to claim 4 is characterized in that,
Above-mentioned first LGP is being positioned at end with the opposite side in above-mentioned first side end face by shading,
Above-mentioned second LGP is being positioned at end with the opposite side in above-mentioned second side end face by shading.
8. display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit is characterized in that,
Above-mentioned planar light source device is claim 1 or 2 described planar light source devices.
9. display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit is characterized in that,
Above-mentioned planar light source device is the described planar light source device of claim 3.
10. display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit is characterized in that,
Above-mentioned planar light source device is the described planar light source device of claim 4.
11. a display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit is characterized in that,
Above-mentioned planar light source device is the described planar light source device of claim 5.
12. a display unit possesses planar light source device and by from the output light of this planar light source device and illuminated display unit is characterized in that,
Above-mentioned planar light source device is the described planar light source device of claim 6.
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| JP2006019090 | 2006-01-27 | ||
| JP019090/2006 | 2006-01-27 | ||
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| CN102095168A (en) * | 2009-12-11 | 2011-06-15 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and light guide plate thereof |
| CN102200608A (en) * | 2010-03-26 | 2011-09-28 | Lg伊诺特有限公司 | Light guide plate and backlight unit |
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| CN104977648B (en) * | 2015-06-24 | 2018-03-09 | 武汉华星光电技术有限公司 | Light guide plate, backlight module and display device |
| CN106704566A (en) * | 2015-07-21 | 2017-05-24 | 比亚迪股份有限公司 | Luminous handle head and vehicle provided with luminous handle head |
| CN107608137A (en) * | 2017-10-31 | 2018-01-19 | 合肥鑫晟光电科技有限公司 | A kind of light source, backlight module and display device |
| CN108881564A (en) * | 2018-09-17 | 2018-11-23 | Oppo（重庆）智能科技有限公司 | Casing and electronic equipment for electronic equipment |
| CN108881564B (en) * | 2018-09-17 | 2021-01-15 | Oppo（重庆）智能科技有限公司 | A casing and electronic equipment for electronic equipment |
| CN109774589A (en) * | 2019-03-21 | 2019-05-21 | 重庆长安汽车股份有限公司 | Shift light panel module |
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