CN1176501C - Surface illuminating device - Google Patents
Surface illuminating device Download PDFInfo
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- CN1176501C CN1176501C CNB011124547A CN01112454A CN1176501C CN 1176501 C CN1176501 C CN 1176501C CN B011124547 A CNB011124547 A CN B011124547A CN 01112454 A CN01112454 A CN 01112454A CN 1176501 C CN1176501 C CN 1176501C
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Abstract
The present invention provided a surface illuminator with good homogeneity and high brightness. The surface illuminator of the present invention comprises a light guiding board with a top surface and an undersurface oppositing to each other; a reflector set under the light guiding board; a LED light source having at least one LED element, radiating the light which is from the LED element from one end of the light guiding board. The top surface of the light guiding board radiates light, characterized in that said one end of the light guiding board has a concave light dispersion unit, which disperses the light radiating from the LED light source into the light guiding board. And the light dispersion unit is characteristic in that the up end of the light dispersion unit is formed on the end surface and having a distance from the top surface.
Description
Technical field
The present invention relates to a kind of surface illuminating device, this device can be used for LCD backlight, and panel meter on display lamp or the face illuminated switch etc., can be made light-emitting diode as point-source of light by the light-emitting area of light guide plate equably, be that the light of LED sheet incident exhales.
Background technology
In recent years, as the light source of LCD backlight etc., usually with making the light that sends from the LED sheet of point-source of light be the planar surface illuminating device that sends.The formation of this surface illuminating device is that incident and is penetrated light from another entire main surface of this light guide plate from the light of 1 or 2 light-emitting diode from the end face of the light guide plate with corresponding main surfaces.For this surface illuminating device, export only very importantly equably from its outgoing plane, and, various schemes and structure have been proposed in order to realize uniformity.Present this surface illuminating device of example that proposes that Figure 19 summarily illustrates.The surface illuminating device of Figure 19 has translucent resin light guide plate 901, and this light guide plate 901 has the 1st first type surface and the 2nd first type surface; LED mold portion 902, this mold portion 902 is facing to the end face configuration of this light guide plate 901, and inside is cast with the LED element; Be located on light guide plate the 2nd main surface side, for sending light, and catoptrical reflector 904 from the 1st main surface side.
Surface illuminating device for this Figure 19, owing on the incident end face of light guide plate 901, formed half-cylindrical grooving 911, light equably above the first type surface that is parallel to light guide plate 901 direction disperse to inject, therefore, can make the light of injecting from the LED element export uniform planar light from the 1st first type surface.
Yet for existing surface illuminating device shown in Figure 19, the problem of existence is on the 1st first type surface of light guide plate, and it is extremely bright to become near grooving portion 911.
In addition, though the existing surface illuminating device of Figure 19 has been realized homogenizing in the face to a certain degree because of grooving portion 911, but still not enough.
Summary of the invention
Therefore, the objective of the invention is to address the above problem, provide a kind of uniformity better, can the luminous sheet light emitting apparatus of high briliancy.
The inventor is according to various laboratory test results, forms the light diffusion part of determining shape on the light guide plate end face, finds by can spreading equably from the light of light guide plate end incident in the light guide plate, thereby makes the present invention.
That is to say that surface illuminating device of the present invention comprises light guide plate, reflector and white light-emitting diode, is white luminous LED; Above-mentioned light guide plate possess respect to one another above and below; Above-mentioned reflector is located at below this light guide plate; Above-mentioned white luminous LED has at least one LED sheet, and being arranged to can be from the light of this LED sheet state from a surface feeding sputtering of above-mentioned light guide plate; The light of the white luminous LED of ejaculation is characterized in that above above-mentioned light guide plate,
Above-mentioned white luminous LED sends more by above-mentioned LED sheet and absorption behind the visible light from this LED sheet, and the fluorescent material of wavelength visible combines, above-mentioned light guide plate outgoing plane facing to above-mentioned white luminous LED on an above-mentioned end face is provided with the light diffusion part that is made of a plurality of groovings, make from the light of above-mentioned white luminous LED incident with a plurality of grooving portion and in above-mentioned light guide plate, to disperse, the upper end of the grooving of this light diffusion part on an above-mentioned end face above above-mentioned certain distance.
On above-mentioned surface illuminating device, the grooving of above-mentioned smooth diffusion part has opposing end surface and the 1st inclined plane and the 2nd inclined plane that tilt to the inside, and form with leave top certain distance a bit be the summit and towards be provided with reflector below the triangle taper expanded.
On above-mentioned surface illuminating device, the 1st inclined plane and the 2nd inclined plane of grooving that is positioned at the central portion of above-mentioned smooth diffusion part forms roughly the same angle with respect to an above-mentioned end face, and along with central portion away from above-mentioned smooth diffusion part, angle between the 1st inclined plane that becomes grooving outside sidewall of above-mentioned a plurality of groovings and the end face of above-mentioned light guide plate is near the right angle, on the contrary, the angle that becomes between the end face of the 2nd inclined plane of inside side walls and above-mentioned light guide plate diminishes.
Description of drawings
Fig. 1 is the plane graph of the surface illuminating device of the invention process form 1.
Fig. 2 is the perspective view of the light guide plate of form of implementation 1.
Fig. 3 is the front view of the led light source of form of implementation 1.
Fig. 4 is the plane graph of the surface illuminating device of the invention process form 2.
Fig. 5 is the front view of the bar-shaped light source of LED of form of implementation 2.
Fig. 6 is the perspective view of the light guide plate of form of implementation 2.
Fig. 7 is the decomposition diagram of the surface illuminating device of variation 1 of the present invention.
Fig. 8 (a) is the pattern cross-sectional view for the refraction that the diffusion part in the surface illuminating device of the present invention is described, (b) is the pattern skiagraph for the refraction that the diffusion part in the surface illuminating device of the present invention is described.
Fig. 9 is the perspective view of light guide plate of the surface illuminating device of variation 2 of the present invention.
Figure 10 is the perspective view of light guide plate of the surface illuminating device of variation 3 of the present invention.
Figure 11 is the perspective view of light guide plate of the surface illuminating device of variation 4 of the present invention.
Figure 12 is the perspective view of light guide plate of the surface illuminating device of variation 5 of the present invention.
Figure 13 is the perspective view of light guide plate of the surface illuminating device of variation 6 of the present invention.
Figure 14 is the perspective view of light guide plate of the formation different with Figure 13 of the surface illuminating device of variation 6 of the present invention.
Figure 15 is the perspective view of light guide plate of the surface illuminating device of variation 7 of the present invention.
Figure 16 is the perspective view of light guide plate of the structure different with Figure 15 of the surface illuminating device of variation 7 of the present invention.
Figure 17 is the figure that the luminance on the light-emitting area of light guide plate 1 of surface illuminating device of this form of implementation 1 is shown.
Figure 18 is the figure that the luminance on the light-emitting area of light guide plate 1 of surface illuminating device shown in Figure 19 (existing example) is shown.
Figure 19 is the plane graph of the surface illuminating device of existing example.
Figure 20 is the pattern cross-sectional view for the refraction that the diffusion part in the surface illuminating device of the present invention is described, (b) is the pattern skiagraph for the refraction that the diffusion part in the surface illuminating device of the present invention is described.
Embodiment
Form of implementation 1
As shown in Figures 1 and 2, the surface illuminating device of the embodiment of the invention 1 possesses light guide plate, and this light guide plate is at a face of relative interarea, promptly below on possess reflector 4, and another side is a light-emitting area 12; Outgoing plane faces toward an end face of light guide plate 1, i.e. the led light source of incident end face configuration; With constitute as ester moulding, light guide plate 1 and led light source 2 remained on assigned position close the supporting mass of fastening 3.
Therefore, especially, the characteristics of the surface illuminating device of present embodiment 1 are to have formed the light diffusion part 11 with a plurality of triangular pyramidal grooving 11a on the position of the outgoing plane 26 that faces toward led light source on the incident end face of light guide plate 1, owing to formed light diffusion part 11, near the light diffusion part 11 on the light-emitting area of light guide plate 1 abnormal luminous can be suppressed, and the uniformity that distributes in the surface of the luminous intensity on the light-emitting area 12 can be improved.
Below, be described in detail.Surface illuminating device for present embodiment 1, led light source 2 is made in the following manner as Fig. 1, ground shown in Figure 3: LED sheet (LED element) 21 is set in the cap 22a on the leading section of lead frame 22, the translucent resin 24 that contains fluorophor is filled in this cap, then, whole translucent resin 25 molds that use.
Here, as shown in Figure 3, the outgoing plane of translucent resin 25 will be made comparatively smoothly.An electrode in the positive and negative electrode of LED sheet 21 is connected with lead frame 22, and another electrode is connected with near being located at lead frame 22 lead frame 23.
In present embodiment 1, light guide plate 1 forms as injection moulding by translucent resin, as shown in Figure 2, forms a plurality of triangle taper grooving 11a on one end 10, and 11a constitutes light diffusion part 11 by these groovings.This grooving 11a is the triangle taper, and the summit of this pyrometric cone is close light-emitting area 12 places on the end face 10 of light guide plate 1, expansion below formation reflector 4.
In addition, in Fig. 2, the part that dots that is marked with symbol 26a is the part that faces toward the outgoing plane 26 of led light source 2 on end face 10.
For form of implementation 1, the diffuser plate 11 that supporting mass 3 makes the outgoing plane 26 of led light source 2 and light guide plate 1 as illustrated in fig. 1 near and relatively locate led light source 2 and light guide plate after fix.In addition, outgoing plane 26 with led light source 2 is identical in fact for the shape of the opening portion of the arrangements of components portion 31 of supporting mass 3 configuration led light sources 2, therefore, the light that has prevented the leakage beyond the outgoing plane 26 of led light source 2 is injected on the light guide plate from the part beyond the light diffusion part 11.That is to say, when this arrangements of components portion 31 is configured on the assigned position, limited out a light path of only injecting light guide plate from the light of led light source 2 to led light source 2 from light diffusion part 11.
For the surface illuminating device of the form of implementation 1 that as above constitutes,, therefore, have following effect and effect because the formation of the light diffusion part 11 of light guide plate 1 possesses the grooving 11a of a plurality of triangle tapers.
Promptly, because triangle taper grooving 11a has two faces (hereinafter referred to as the 1st inclined plane and the 2nd inclined plane) with respect to end face 10 inclinations, therefore, the light that the incidence angle of (angle of total reflection) (angle that line direction dough-kneading method line constitutes before the light) incides on the 1st inclined plane and the 2nd inclined plane by at a certain angle incides in the light guide plate 1 with the refraction angle corresponding with this incidence angle.At this moment because the 1st inclined plane and the 2nd inclined plane tilt to the inside with respect to end face 10 respectively, only with such tilt quantity, from the light of the 1st inclined plane and the 2nd inclined plane incident to the side surface direction expansion of light guide plate 1 incide in the light guide plate 1.
Incide light on one the 1st inclined plane or the 2nd inclined plane by the 1st inclined plane or the 2nd inclined plane total reflection with incidence angle, incided on the light guide plate 1 from another the 2nd inclined plane or the 1st inclined plane respectively by the light after the total reflection greater than the angle of total reflection.
Like this, incide light on the light diffusion part 11 and shown in Fig. 8 (a) pattern, incided in the light guide plate 1 after the diffusion, consequently can improve the uniformity of the glorious degrees on the light-emitting area 12 of light guide plate 1.
For the surface illuminating device of this form of implementation 1, it a bit be that the summit is the triangle taper below formation reflector 4 with distance light-emitting area 12 that grooving 11a forms on the end face 10 of light guide plate 1.That is, grooving 11a is owing to having peristome, so shown in Fig. 8 (b), can directly inject on the light-emitting area from the light that light-emitting component 2 penetrates on light-emitting area 12.
Whereby, as existing example, can prevent light and spill and directly seen from the gap (peristome) that may exist between light guide plate and the LED, just its part becomes extremely bright abnormal luminous.
In addition, because grooving 11a forms to the big triangle taper of following change,,, the light of vertical incidence is reflected to following direction with respect to the end face of light guide plate 1 so the 1st, the 2nd inclined plane is downward.Therefore,, penetrate, therefore, can more effectively penetrate from light-emitting area from light-emitting area 12 owing to can make light with respect to the end face vertical incidence of light guide plate 1 be located at the upwards reflection of effect in the reflector 4 below the light guide plate.
Promptly, though the light with respect to end face 10 vertical incidence of layer tabula rasa 1 is the higher light of intensity, if but the structure of existing example, the incident light that then impinges perpendicularly on the end face carries out abreast with respect to light-emitting area in light guide plate, as penetrating from the other end, from the light that light-emitting area penetrates, the ratio that can not effectively utilize increases.
On the contrary,,, impinge perpendicularly on the direction refraction in the reflector 4 of light below being located at light guide plate on the end face of light guide plate 1 and incident downwards, can penetrate light from light-emitting area by reflector 4 reflections if the 1st, the 2nd inclined plane forms as this form of implementation 1.
As shown in figure 17, there be not bright abnormal luminous of the local extreme of light-emitting area 12 in the surface illuminating device of this form of implementation as above 1, and can observe luminous uniformly in light-emitting area.Externally do not incide in the light guide plate 1 owing to the light from led light source does not drain to, therefore, can utilize light, can improve whole glorious degrees with higher efficient.
In addition, Figure 18 illustrates and uses the illumination mode on the light-emitting area when having example now.Among this Figure 18, near the light diffusion part of light guide plate, it is luminous to can be observed significant abnormal.
Form of implementation 2
Below, the surface illuminating device of the 2nd form of implementation of the present invention is described.
The surface illuminating device of this form of implementation 2 possesses bar-shaped light source 100 of LED and light guide plate 101 as shown in Figure 4.
In form of implementation 2, shown in Fig. 4,5, the bar-shaped light source of LED has a plurality of illuminating parts 102, and this illuminating part 102 is as in the recess 131 that forms LED sheet 21 being set on stick-like body portion 125 sides that are made of resin molded body, and filling translucent resin 124 backs constitute.
Here, translucent resin 124 contains fluorophor, and this fluorophor absorbs the light that LED sheet 21 sends, and sends the light that wavelength is different from the light wavelength of its absorption, by light that LED sheet 21 is sent with from the light colour mixture of fluorophor, send the light of desired color from outgoing plane 126.
For the surface illuminating device of implementing 2, light guide plate 101 is as forming by injection moulding, and one end forms the side configuration of a plurality of illuminating parts of the bar-shaped light source 100 of LED vis-a-vis.Thereby as shown in Figure 6, on an end face of this light guide plate 101, in the grooving 111a facing to a plurality of triangle tapers of formation on the part of illuminating part 102, a plurality of grooving 111a are divided into 2 groups and form 2 light diffusion parts 111.In addition, in Fig. 6, be part facing to the outgoing plane 126 of illuminating part 102 with the part on symbol 126a surface.
Here, the grooving 111a in this form of implementation 2 is identical with form of implementation 1, on an end face of light guide plate 101, with the distance light-emitting area, promptly above certain of certain distance be the summit a bit, to be provided with the reflector below be the triangle taper.
As above the surface illuminating device of the form of implementation 2 of Gou Chenging has effect and the effect identical with form of implementation 1, and owing to possess a plurality of illuminating parts 102, can constitute the bigger surface illuminating device of light-emitting area.
In Fig. 4, though 2 illuminating parts 102 are shown, the present invention is not limited to 2, and the bar-shaped light source of LED can have the illuminating part more than 2.
＜variation 〉
Below, variation of the present invention is described.
Variation 1
As shown in Figure 7, the surface illuminating device of variation 1 of the present invention is to be replaced a plurality of grooving 111a to constitute beyond the light diffusion part formation that others are the same with the surface illuminating device of form of implementation 2 on the light guide plate 101 of the surface illuminating device of form of implementation 2 by the grooving 105 of a triangle taper.
In addition, the triangle taper grooving 105 in the surface illuminating device of this variation 1 and the grooving 11a of form of implementation 1 and form of implementation 2,111a compares, and shape is bigger.For the surface illuminating device of this variation 1, grooving 105 is on an end face of light guide plate 101, with the distance light-emitting area, promptly above certain of certain distance be the summit a bit, to be provided with the reflector below be the triangle taper.
The surface illuminating device of the variation 1 of Gou Chenging is because grooving 105 has two inclined planes for end face 10 like this, therefore, as illustrated in the form of implementation 1, incide (Fig. 8 (a)) in the light guide plate 1 diffusely to the side surface direction of light guide plate 101 from the light of 2 inclined plane incidents.
Yet,, still can improve the uniformity of the glorious degrees on the light-emitting area of light guide plate 101 even have the light guide plate 101 of a grooving 105.
Because grooving 105 has peristome on light-emitting area 12, therefore shown in Fig. 8 (b), can prevent from directly to penetrate from light-emitting area 12 from the light that illuminating part 102 penetrates.
Therefore, shown in conventional example, can prevent light and spill and directly seen from the gap (peristome) that may exist between light guide plate and the LED, just its part becomes extremely bright abnormal luminous.
Because grooving 105 is to the triangle taper that enlarges below, therefore, its 2 inclined planes are towards the below, can make light with respect to end face 104 vertical incidence of light guide plate 101 to following refraction.Therefore, penetrate by reflector 103 reflections on being arranged on below the light guide plate and from light-emitting area, therefore, can more effectively penetrate from light-emitting area owing to can make perpendicular to the light of end face 104 incidents of light guide plate 101.
As above explanation, the surface illuminating device of variation 1 of the present invention have effect and the effect identical with form of implementation 1 and form of implementation 2, but in following some effect and effect difference.
For the surface illuminating device of variation 1, because of the grooving 105 of light guide plate 101 is one, can simplify the structure of the mould of making light guide plate 101, reduce the mould price.Therefore, make light guide plate 101 inexpensive.
For the surface illuminating device of variation 1, because of the grooving 105 of light guide plate 101 is one, with the grooving 11a of grooving 105 with form of implementation 1 and 2, the grooving of 111a compares, and must increase.Therefore, grooving 105 formed spaces can increase the amount of light leakage to light guide plate 101 belows.
Thereby, the viewpoint of sending from light-emitting area effectively from the light that makes from light source, more excellent by the structure that a plurality of joint grooves of form of implementation 1 and 2 constitute the light diffusion part.
The triangular pyramidal grooving has the function of prism, and existence will be divided into the situation as cyan and sodium yellow from the light of light source.In the case, for the form of implementation 1 and 2 that is made of the incident section a plurality of groovings, the light of injecting because of certain grooving color separation mixes with the light that other grooving color separation is injected, and can lose this minute optical phenomenon in fact.
Thereby for this minute optical phenomenon purposes that can go wrong, the form of implementation 1 and 2 the structure that are made of the light diffusion part a plurality of groovings are better.
Though diffusion effect is by the decision of the shape of grooving, if when forming a plurality of grooving about a LED, in order to improve diffusion effect, the quantity that is subject to variation, and the quantity of setting should guarantee that the light diffusion effect is higher.
For form of implementation 1 and 2, adjacent grooving 11a, the following contact of 111a light guide plate 101, but the invention is not restricted to this structure, as shown in Figure 9, it is also passable that adjacent grooving leaves the formation of certain distance below mutually.
Like this, can comprise the area and the shape that are positioned at the tabular surface between adjacent grooving, make light diffusion most effectively and inject in the light guide plate and design by light diffusion part integral body.
For example, as shown in Figure 9, if between grooving 211a, establish than form of implementation 1 and 2 wide tabular surfaces, the light that then incides on the grooving 211a is spread, and can pass to the bight of light-incident end side, simultaneously, incide light on the tabular surface can the directive light-incident end and the end face of opposition side on, therefore, the briliancy that can suppress the part of distance L ED reduces.
Thereby the shape that is formed in light guide plate of this variation 2 is that light-incident end is a minor face, and the side of light-incident end is under the occasion of elongated shape of type, is effective especially, thereby, can reduce generation away from the reduction phenomenon of the briliancy of led light source side.
When constituting light entrance face by a plurality of groovings, the shape of grooving can be mutual difference.
For example, under the occasion of the grooving that the triangle taper that constitutes from two planes is set, as shown in figure 10, also can be along with the angle that changes the sidewall of grooving away from light source led element (pipe).
In example shown in Figure 10, the grooving 311a that is positioned at light diffusion part central portion that faces LED element front forms essentially identical angle with respect to the light guide plate end face, along with away from central portion, the angle that the outside sidewall of grooving 311a and light guide plate end face constitute is near the right angle, on the contrary, the angle of inside side walls and light guide plate end face formation diminishes gradually.If like this, can make light with bigger scope diffusion, light is sent to the corner of incident end face.Thereby the very big light guide plate of width is very effective for using.
For above variation 3, though show in light diffusion part 311, along with distance is positioned at central grooving 311a apart from increase, the example of Sidewall angles variation in turn, the present invention does not limit this, and angle also can optionally change.
In Figure 10, the angle with respect to end face on whole inclined planes of a plurality of grooving 311a of formation light diffusion part 311 form differently (selecting the angle on the inclined plane of 2 grooving 311a to differ from one another arbitrarily) mutually, and present embodiment is not limit this yet.
That is to say, among the present invention,, then can obtain the effect identical with this variation if the inclined plane of at least 2 groovings among a plurality of grooving 311a differently constitutes with respect to the angle of end face.
For the surface illuminating device of form of implementation 1 and 2, though form the grooving of triangle taper, the invention is not restricted to this formation, as shown in figure 11, also can utilize the grooving 411a of semi-conical to form light diffusion part 411.
Adopt formation as above, can produce and form of implementation 1 and 2 identical effects.
Yet the grooving 411a of semi-conical compares with the grooving of triangle taper, because the aperture area that the grooving below the light guide plate forms is big slightly, therefore, light has some leakages from this part.
Variation 5
For surface illuminating device of the present invention, as shown in figure 12, also can utilize semicircle taper type grooving 511a to form light diffusion part 511.
If adopt above-mentioned formation, then have and form of implementation 1 and 2 same effect and effects.
In variation 5, the grooving 511a of semicircle taper type, it top away from (light-emitting area) above the light guide plate, and its is following away from below the light guide plate.
Like this grooving 511a of Xing Chenging since on light guide plate (light-emitting area) and below on do not have opening portion, therefore, can prevent abnormal luminous on the light-emitting area of light guide plate, and prevent from the leakage of light guide plate lower light.
Variation 6
For surface illuminating device of the present invention, as shown in figure 13, also can use semi-cylindrical grooving 611a to form light diffusion part 611.
Here, grooving 611a has the upper surface substantially parallel with the light-emitting area of light guide plate, and only in the lower aperture of light guide plate.
In addition, in this variation 6,, the invention is not restricted to this mode with being right after, as shown in figure 14, also can have a compartment of terrain to form light diffusion part 612 to each other though form grooving 611a mutually.
Even like this, also have effect and the effect identical with form of implementation 1 and 2.
Variation 7
In above form of implementation 1 and 2, form grooving 11a although it is so, 111a, but the present invention does not limit this kind structure, can form hemispheric groove 505 as shown in figure 15 on the end face 504 of light guide plate yet.
In addition, in this variation 7, the upper end of groove 505 and any one end face in the lower end are respectively apart from the limit, upper end 506 of end face 504 and the certain distance in limit, lower end 507.
If form like this and since the light that led light source sends can be not directly from the light-emitting area of light guide plate (above) leakage, thereby can prevent abnormal luminous on the light-emitting area.
In this variation 7, because light can direct leakage below light guide plate yet, therefore, incident light sends from light-emitting area with higher efficient in light guide plate.
In this variation 7, as shown in figure 16, also can form a plurality of hemispheric groove 505a.
Above, according to form of implementation 1,2 and variation 1-7 at length be illustrated, surface illuminating device of the present invention is to form 1 or 2 grooving or recess on the light guide plate end face, and form lowest term at least the last end distance light-emitting area certain distance of these groovings or recess, in light guide plate, spread and incident with this light of injecting, prevented abnormal luminous on the light-emitting area.
In addition, in this manual, grooving and recess are generically and collectively referred to as the light diffusion part.
That is to say, among the present invention grooving or recess except possessing above-mentioned lowest term, can become cone-shaped, bar shape, the perhaps different shape of the shape of the apex of cone being downcut etc. with plane or curved surface.Here, cone-shaped is as circular cone. pyramid, and by by connecting the bottom surface, the shape that curved surface that the point (summit) of the periphery of bottom surface and certain distance is made or plane constitute, this summit can be on the end face of light guide plate, perhaps is positioned at the inboard or the outside of light guide plate end face.Again, bar shape is as cylinder or corner post, by the shape that bus surrounded of producing peaceful row from the bottom surface.
Surface illuminating device of the present invention from the light diffusion part of different shape, according to the shape of light guide plate, is selected only shape as mentioned above, obtains the more effectively structure of diffusion into the light emitted.At this moment, increase light diffusion part quantity, or when increasing the quantity of face, more the intricately reverberation can improve the briliancy uniformity, but mold structure complicates, the result exists by the shape of the end face of the light guide plate of this mould manufacturing and can not guarantee certain problem.Therefore, preferably except the desired mode of application target, used shape is selected in the back of also will considering to create conditions.
That is to say, the present invention is owing to can select different shape, and therefore, any one in selecting grooving or recess is as the light diffusion part, also will synthetically consider the desired performance of target, restriction in the Mold Making (making precision and cost of manufacture etc.) and forming accuracy are made decision again.
Below, the preferred material that relates to each key element in the surface illuminating device of the present invention is described.
For the present invention, as the used material of light guide plate, preferably use all good material of light transmission and formability, for instance, allyl resin, polycarbonate resin, polyene resin, polystyrene resin.The material that these light guide plate are used refractive index difference separately, but by the grooving on the selection light guide plate end face or the shape of recess, and quantity etc., just can control the diffusion of light, which kind of material all can adapt to.
(led light source)
Can use LED sheet more than 1 or 2 for led light source of the present invention.In addition, light from the LED sheet is injected on the light guide plate, or for example, can send the LED sheet and the visible light that absorbs from the LED sheet of visible light, the fluorescent material combination that the above-mentioned visible light of the wavelength ratio of sending is long, the light different with the light that penetrates from the LED sheet wavelength incide in the light guide plate.
That is to say, in the present invention, by being used in combination, because light-emitting component and fluorescent material this group in the combination, just can send the secondary colour of each tone with LED sheet and fluorophor.
Below, about be suitable for most being used for LCD backlight, the high white luminous LED of needs, to have LED sheet nitride-based semiconductor, that can send blue or green light, use yttrium by the iridium activation. aluminium. garnet fluorophor is that example describes.
As compound semiconductor that can use, nitride-based (general expression InIGajAlkN, but, 0=I, 0=j, 0=k, i+j+k=1), the GaN that is concentrated with InGaN and various impurity is representative, has various.
This LED sheet makes the semiconductor of InGaN or GaN etc. grow into luminescent layer on substrate through mocvd method and forms.As semi-conductive structure, there is MIS to engage for instance, similar structure, metamer structure or two metamer structure of PI joint or PN joint etc.This nitride semiconductor layer can be selected various emission wavelengths according to its material and its mixed crystal degree.The semiconductor active layer is become with the single quantum well family structure or the multiple quantum well family of the film formation that produces the quantum effect constructs.
Among the present invention,, but preferably use semiconductor light emitting layer, with the yttrium by the iridium activation described later with pastiness coloured light as the LED sheet. aluminium. garnet fluorophor describes as example.
(fluorophor)
As the fluorescent material that uses in the surface illuminating device of the present invention, have by visible light or ultraviolet ray excited and luminous light-emitting fluophor.As concrete light-emitting fluophor, though according to light complementary color from the nitride semiconductor LED sheet that can send cyan light, have for example as the fluorescent material that can send white light, yttrium by iridium activation. aluminium. garnet fluorophor, but Mg5Li6Sb6O13:Mn or Mg2TiO4:Mn fluorophor or these fluorescent materials are mixed the fluorescent material that the back forms also can use.
Therefore, relevant to the fluorescent material that is more suitable for, by the yttrium of iridium activation. aluminium. garnet fluorophor is expressed as follows.
Among the present invention, pay the yttrium of the iridium of having lived. aluminium. garnet class fluorophor should be the material of special extensive interpretation, just mean and select the part or all of yttrium of at least a element substitution in one group that constitutes with Lu, Sc, La, Gd and Sm, perhaps, with any among Ga and the In or two kinds of replacing sections or part yttrium, can send the fluorophor of fluorescence.
In more detail, by general expression (YzGd1-z) 3Al5O12:Ce (but, 0z≤1) the fluorescigenic fluorophor shown in or by general expression (Re1-a) 3Re`5o12:Ce (but, 0≤a＜1, Re is select from Y, Gd, La, Sc at least a, and Re` is select from Al, Ga, In at least a) shown in fluorescigenic fluorophor.
(embodiment 1)
The surface illuminating device of embodiments of the invention 1 is an example that uses the light guide plate of using as shown in Figure 6 entirely in form of implementation 2.As the material of this light guide plate, use Merlon, the mould that light guide plate forms usefulness be can the 2nd interarea of light guide plate end face (below) go up and form the cone-shaped grooving 111a of portion that constitutes by 2 planes totally 8 moulds side by side in 2 places.In addition, this mould should carry out concavo-convex processing, so that improve the luminous uniformity of the 2nd interarea of light guide plate.The shaping of light guide plate at first is set at 280CO to forming temperature, makes the Merlon fusing, and to penetrate pressure 1000kgf/cm2, mold temperature is to ejection formation under the 100CO.Cool off after 45 seconds, from mould, take out.Form light guide plate like this.On the light guide plate that so obtains, the reflector is set, but is not taking out the 1st interarea (light-emitting area) of planar light from light guide plate and establishing the reflector to the end face of light guide plate lead-in light.Again, dispose led light source on the end face of the light guide plate of not establishing the reflector, this led light source has 2 LED sheets, and state ED is made of the nitride that can send white light.If make the LED sheet upper reaches overcurrent of the surface illuminating device that obtains like this, then light is from the surface feeding sputtering of light guide plate, sends planar light from the 1st interarea of light guide plate.The surface illuminating device that forms does not find that there is extreme bright abnormal luminous phenomenon the part, also can improve glorious degrees.
(embodiment 2)
Material as light guide plate uses allyl resin, the mould that uses can form 3 spherical recesses shown in Figure 16 as embodiment 1 ground in 2 places on the light guide plate end face, forming temperature is 250CO, penetrates pressure 1100kgf/cm2, mold temperature 80CO, moulding about 30 seconds of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 2.For the sheet light emitting apparatus that obtains like this, if make electric current flow through the LED sheet, send the planar light time, do not find the abnormal luminous phenomenon of local incandescent, also can improve glorious degrees.The surface illuminating device aberration of embodiment 2 is little, and uniformity is fabulous.
(embodiment 3)
Material as light guide plate uses allyl resin, the mould that uses can be at the mould that forms the light guide plate that is separated between the grooving as shown in Figure 9, adjacent on the light guide plate end face below light guide plate, forming temperature is 250CO, penetrate pressure 1100kgf/cm2, mold temperature 80CO, moulding about 30 seconds of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 3.For the sheet light emitting apparatus of this embodiment 3, if make electric current flow through the LED sheet, send the planar light time, do not find the abnormal luminous phenomenon of local incandescent, in addition,, also can improve apart from the briliancy of the part of incident end face because of being provided with tabular surface.
(embodiment 4)
Material as light guide plate uses allyl resin, the mould that uses can on the light guide plate end face, form as shown in figure 10, along with the distance of distance L ED, make 9 side by side of the cone-shaped groovings that the face angle of grooving changes, and the mould that as embodiment 1, on position on 2, forms, forming temperature is 250CO, penetrate pressure 1100kgf/cm2, mold temperature 80CO, moulding about 30 seconds of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 4.For the sheet light emitting apparatus of this embodiment 4, if make electric current flow through the LED sheet, send the planar light time, do not find the abnormal luminous phenomenon of local incandescent, also can improve briliancy.The bight of light-incident end side can access brighter more uniform planar more luminous than embodiment 1.
(embodiment 5)
Material as light guide plate uses allyl resin, the mould that uses can form on the light guide plate end face as shown in figure 13,6 moulds that as embodiment 1, on 2 positions, form side by side of cylindric grooving, forming temperature is 300CO, penetrate pressure 1500kgf/cm2, mold temperature 120CO, moulding about 1 minute of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 5.For the sheet light emitting apparatus of this embodiment 5, if make electric current flow through the LED sheet, send the planar light time, though find that briliancy has a little bias, so the side of grooving portion because be that the curved surface colour mixture is good, evenly being improved of color.
(embodiment 6)
Material as light guide plate uses allyl resin, the mould that uses can clip the par between the cylindric grooving that forms on the fluorophor end face as shown in figure 14, and vertically 4 and the mould that as embodiment 1, on 2 positions, forms side by side of cloak ground tabula rasa, forming temperature is 300CO, penetrate pressure 1500kgf/cm2, mold temperature 120CO, moulding about 1 minute of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 6.For the sheet light emitting apparatus of this embodiment 6, if make electric current flow through the LED sheet, send the planar light time, though find that briliancy has a little bias, so the side of grooving portion because be that the curved surface colour mixture is good, the uniformity of color is improved.In addition, because of establishing the par, can also improve apart from the briliancy of the part of incident end face.
(embodiment 7)
Material as light guide plate uses allyl resin, the mould that uses can be at 6 moulds that form on 2 positions as embodiment 1 side by side of coniform grooving that form on the light guide plate end face as shown in figure 11, forming temperature is 220CO, penetrate pressure 600kgf/cm2, mold temperature 50CO, moulding about 30 seconds of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 7.For the sheet light emitting apparatus of this embodiment 7, if make electric current flow through the LED sheet, send the planar light time, because the side of grooving portion is a curved surface,, can improve the uniformity of color so colour mixture is good, in addition, briliancy deviation ratio column grooving is better.
(embodiment 8)
Material as light guide plate uses allyl resin, the mould that uses can be at 6 moulds that form on 2 positions as embodiment 1 side by side of groove that form the shape that conical tip is partly cut away as shown in figure 12 on the light guide plate end face, forming temperature is 250CO, penetrate pressure 1200kgf/cm2, mold temperature 80CO, moulding about 30 seconds of cooling time.Others are identical with the foregoing description 1, thereby formed the sheet light emitting apparatus of embodiments of the invention 8.For the sheet light emitting apparatus of this embodiment 8, if make electric current flow through the LED sheet, send the planar light time, briliancy deviation ratio column better is so because the side of grooving portion is that the curved surface colour mixture is good, the uniformity of color is improved.
Similarly, as a comparative example, except form on the light guide plate end face as shown in figure 19, with the light guide plate of the contacted cylindrical grooving of light guide plate end face, the 1st interarea and the 2nd interarea portion, other and the embodiment 1 identical sheet light emitting apparatus of making.Surface illuminating device for this comparative example 1, make electric current flow through the LED sheet, send planar light, from the gap location light leak that may exist between the grooving portion that the 1st interarea at LED and light guide plate end face forms, confirm that just this part becomes extreme become clear abnormal luminous, it is luminous to obtain uniform face.Again, the glorious degrees of other parts is also insufficient.
The as above detailed description of being done, surface illuminating device of the present invention can make the light on the light guide plate of inciding of emitting from the LED element even and high briliancy ground penetrates from light guide plate, and, can prevent abnormal luminous on the light-emitting area of light guide plate.
Claims (3)
1. surface illuminating device, this surface illuminating device comprises light guide plate, reflector and white light-emitting diode, is white luminous LED; Above-mentioned light guide plate possess respect to one another above and below; Above-mentioned reflector is located at below this light guide plate; Above-mentioned white luminous LED has at least one LED sheet, and being arranged to can be from the light of this LED sheet state from a surface feeding sputtering of above-mentioned light guide plate; The light of the white luminous LED of ejaculation is characterized in that above above-mentioned light guide plate,
Above-mentioned white luminous LED sends more by above-mentioned LED sheet and absorption behind the visible light from this LED sheet, and the fluorescent material of wavelength visible combines, above-mentioned light guide plate outgoing plane facing to above-mentioned white luminous LED on an above-mentioned end face is provided with the light diffusion part that is made of a plurality of groovings, make from the light of above-mentioned white luminous LED incident with a plurality of grooving portion and in above-mentioned light guide plate, to disperse, the upper end of the grooving of this light diffusion part on an above-mentioned end face above above-mentioned certain distance.
2. surface illuminating device according to claim 1, it is characterized in that, the grooving of above-mentioned smooth diffusion part (11a) has opposing end surface (10) and the 1st inclined plane and the 2nd inclined plane that tilt to the inside, and form with leave top certain distance a bit be the summit and towards be provided with reflector below the triangle taper expanded.
3. surface illuminating device according to claim 2, it is characterized in that, the 1st inclined plane and the 2nd inclined plane of grooving (311a) that is positioned at the central portion of above-mentioned smooth diffusion part (311) forms roughly the same angle with respect to an above-mentioned end face, along with central portion away from above-mentioned smooth diffusion part, angle between the 1st inclined plane that becomes grooving (311a) outside sidewall of above-mentioned a plurality of groovings and the end face of above-mentioned light guide plate is near the right angle, on the contrary, the angle that becomes between the end face of the 2nd inclined plane of inside side walls and above-mentioned light guide plate diminishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011124547A CN1176501C (en) | 2000-05-09 | 2001-04-02 | Surface illuminating device |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000135713A JP3458823B2 (en) | 1999-05-11 | 2000-05-09 | Surface emitting device |
| JP135713/2000 | 2000-05-09 | ||
| CN00137631.4 | 2000-12-28 | ||
| CN00137631 | 2000-12-28 | ||
| CNB011124547A CN1176501C (en) | 2000-05-09 | 2001-04-02 | Surface illuminating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1323069A CN1323069A (en) | 2001-11-21 |
| CN1176501C true CN1176501C (en) | 2004-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011124547A Expired - Fee Related CN1176501C (en) | 2000-05-09 | 2001-04-02 | Surface illuminating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1176501C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10237202A1 (en) * | 2002-08-14 | 2004-02-26 | Carl Zeiss Jena Gmbh | Optical integrator bar for optical projectors, uses a number of luminescent diodes that introduce light that is reflected of internal surfaces to form a homogeneous output |
| CN100376977C (en) * | 2002-12-20 | 2008-03-26 | 鸿富锦精密工业（深圳）有限公司 | Area Light source |
| CN100445827C (en) * | 2004-11-18 | 2008-12-24 | 清华大学 | Light-conducting board and backlight mould set |
| KR20060079724A (en) | 2005-01-03 | 2006-07-06 | 삼성전자주식회사 | A backlight assembly removing dark portion and a flat display device provided with the same |
| JP5429633B2 (en) * | 2009-03-09 | 2014-02-26 | Ｎｌｔテクノロジー株式会社 | Surface light emitting device and liquid crystal display device |
| CN102740089A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | 3D display equipment, 3D display equipment backlight scanning control method and apparatus thereof |
| CN102644890B (en) * | 2012-04-01 | 2013-11-20 | 深圳市华星光电技术有限公司 | Narrow-frame backlight module |
| CN103675986A (en) * | 2013-12-12 | 2014-03-26 | 京东方科技集团股份有限公司 | Light guide plate and backlight module |
| CN106443868A (en) * | 2016-11-22 | 2017-02-22 | 苏州茂立光电科技有限公司 | Light guiding plate capable of eliminating hotspots, processing method and backlight module thereof |
| US11999680B2 (en) | 2018-04-24 | 2024-06-04 | Conopco, Inc. | Enhanced conversion of taurine to alkyl taurate amide using phosphoric acid catalysts |
-
2001
- 2001-04-02 CN CNB011124547A patent/CN1176501C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1323069A (en) | 2001-11-21 |
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