CN100565298C - Surface light source apparatus and the display device of using it - Google Patents
Surface light source apparatus and the display device of using it Download PDFInfo
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- CN100565298C CN100565298C CNB2006100644165A CN200610064416A CN100565298C CN 100565298 C CN100565298 C CN 100565298C CN B2006100644165 A CNB2006100644165 A CN B2006100644165A CN 200610064416 A CN200610064416 A CN 200610064416A CN 100565298 C CN100565298 C CN 100565298C
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Abstract
The object of the present invention is to provide a kind of utilization ratio height and the homogeneity surface light source apparatus high, that have enough display levels of the interior brightness of face and the display device of using it of light.Surface light source apparatus of the present invention possesses the housing (2) that has peristome (1) at least on one side, led light source (4) that on the one side of the housing (2) relative, keeps and the light guide plate (5) that disposes in the position that covers peristome (1) and led light source (4) with peristome (1), light guide plate (5) possesses and is arranged on the corresponding position of led light source (4) and holds the recess (6) of the part of led light source (4), with the bottom that is arranged on recess (6) and adjust light quantity adjustment unit (7) from the light of led light source (4), light quantity adjustment unit (7) possesses reflector plate (20), this reflector plate (20) is r establishing mean radius, distance from led light source (4) is H, the light-emitting area of led light source (4) is S, light summation is under the situation of L, has reflection function and total light transmittance t and satisfies t 〉=π r
2Cos θ/{ (1-cos θ) (S-π r
2) relation see through function.
Description
Technical field
The present invention is the invention relevant with light source, particularly a kind of surface light source apparatus and the display device of using it.
Background technology
Existing surface light source apparatus is following structure: shown in patent documentation 1, be provided with the depression that is used for inserting the cone shape of light source at the back side of light guide plate, and in this depression light source such as fixed L ED.Because it is cone shape that this light source inserts with caving in, thus at least leading section width is narrow more more inward.So, existing surface light source apparatus can reduce the amount of the light that directly penetrates from light source, and can dimming inhomogeneous.
And, surface light source apparatus shown in the patent documentation 2 is pressed into light sources such as LED in the light source insertion section of the back that is formed on light guide plate, form light reflection surface in light source the place ahead, block from light source by this light reflection surface and to penetrate and towards the light in the place ahead, the light of reflection is imported the inside of light guide plate from the side wall surface of light source insertion section, and make the illuminance distributionization of the preceding outgoing plane of light guide plate.
And then, liquid crystal indicator shown in the patent documentation 3 is formed for holding in the central lower of light guide plate the groove of cold-cathode fluorescence lamp, by adjustment shading amount or the volume reflections such as figure of adjusting film at the printing opacity of the bottom surface of groove configuration, whole brightness of display surface is even, has improved the utilization ratio of cold-cathode fluorescence lamp.
No. 3427636 communique of (patent documentation 1) patent
(patent documentation 2) spy opens flat 10-82916 communique
(patent documentation 3) spy opens flat 10-104620 communique
In addition, under the situation of using the existing surface light source apparatus shown in the patent documentation 1, the brightness ratio other parts of the sunk part of cone shape are higher slightly.So, existing surface light source apparatus just can not obtain enough display levels under the situation that further requires brightness homogenization in the face.
And, under the situation of using the existing surface light source apparatus shown in the patent documentation 2, owing to the direct sunshine towards light source the place ahead partly sees through, so diffusion fully of light, have the problem that produces brightness irregularities and so in light source the place ahead.
And, under the situation of using the existing surface light source apparatus shown in the patent documentation 3, owing to the direct sunshine from light source is carried out shading and adjust by figure etc., so also not diffusion fully of light, the problem that produces brightness irregularities and so in light source the place ahead also had.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of utilization ratio height and the homogeneity surface light source apparatus high, that have enough display levels of the interior brightness of face and the display device of using it of light.
Surface light source apparatus of the present invention possesses: the housing that has peristome at least on one side; The light source that on the one side of the housing relative, keeps with peristome; And the light guide plate that disposes in the position that covers peristome and light source, light guide plate possesses; Be arranged on the corresponding position of light source and hold the recess of the part of light source; And the light quantity adjustment unit from the light of light source is also adjusted in the bottom that is arranged on recess, the light quantity adjustment unit possesses reflector plate, this reflector plate to establish mean radius be r, be that the light-emitting area of H, light source is that the light summation of S, light source is under the situation of L from the distance of light source, have reflection and satisfy t 〉=π r from the reflection of light function and the total light transmittance t of light source
2Cos θ/{ (1-cos θ) (S-π r
2) relation see through function.
Because the light quantity adjustment unit that is arranged on the bottom of recess and adjusts from the light of light source possesses reflector plate, this reflector plate has reflection and satisfies t 〉=π r from the reflection of light function and the total light transmittance t of light source
2Cos θ/{ (1-cos θ) (S-π r
2) relation see through function, so the surface light source apparatus of the present invention's record have brightness homogeneity in the utilization ratio height of light and the face high, can have the effect of enough display levels.
Description of drawings
Fig. 1 is the exploded perspective view of the surface light source apparatus of embodiment of the present invention 1.
Fig. 2 is the sectional view of the surface light source apparatus of embodiment of the present invention 1.
Fig. 3 is the figure of characteristic that is used to illustrate the led light source of embodiment of the present invention 1.
Fig. 4 is the sectional view of the light amount regulating unit of embodiment of the present invention 1.
Fig. 5 is the figure that is used for illustrating the reflection characteristic of the reflector plate that the light amount regulating unit in embodiment of the present invention 1 uses.
Fig. 6 is the figure that sees through characteristic that is used for illustrating the reflector plate that the light amount regulating unit in embodiment of the present invention 1 uses.
Fig. 7 is the skeleton diagram of the reflector plate that uses in the light amount regulating unit of embodiment of the present invention 1.
Fig. 8 is the sectional view of the surface light source apparatus of embodiment of the present invention 2.
Fig. 9 is the skeleton diagram of the reflector plate that uses in the light amount regulating unit of embodiment of the present invention 3.
Figure 10 is the light guide plate of embodiment of the present invention 4 and the front view (FV) and the sectional view of reflector plate.
Embodiment
(embodiment 1)
Fig. 1 illustrates the exploded perspective view of the surface light source apparatus of present embodiment.In addition, Fig. 2 illustrates the sectional view of the surface light source apparatus of present embodiment.In the surface light source apparatus shown in Fig. 1, possess: the housing 2 that on a face, is formed with peristome 1; Remain on led light source 4 on the face relative by LED (light emitting diode) substrate 3 with peristome 1; The light guide plate 5 that is provided with in the position that covers peristome 1 and led light source 4; The recess 6 of the cylindrical shape that is provided with in position with led light source 4 corresponding light guide plate 5; And the light quantity adjustment unit 7 that is provided with in the bottom of recess 6.In addition, as can be seen from Figure 2, the part of led light source 4 is contained in the recess 6.
And (side 8 of light guide plate 5 and outgoing plane opposing face 9) is provided with reflector plate 10 between light guide plate 5 and housing 2, and the whole face of the outgoing plane 11 of light guide plate 5 is provided with diffuser plate 12 and optical sheet set 13.In addition, the outgoing plane 11 of light guide plate 5 is consistent with the peristome 1 of housing 2.
The light source that present embodiment is used considers to use light emitting diode (led light source 4) or laser diode pointolites such as (Laser Diode:LD).Led light source 4 has pseudo-White LED, and it is made of the fluorophor that sends monochromatic semiconductor light-emitting elements such as blueness and absorb the part of the blue light that sends from semiconductor light-emitting elements and send sodium yellow.In addition, get all the semiconductor light-emitting elements of RED (red), GREEN (green), BLUE (indigo plant) and in addition ready by three kinds of monochromatic synthetic LED that send from coloured light.Following situation according to the pseudo-White LED of led light source 4 uses illustrates the surface light source apparatus of present embodiment.
Secondly, the light guide plate 5 of present embodiment is made of transparent acrylic resin, poly-carbonic acid junket resin, glass etc.And light guide plate 5 is plate-like shape as depicted in figs. 1 and 2, is provided with columned recess 6 on outgoing plane opposing face 9.And then, on the outgoing plane opposing face 9 of light guide plate 5, being formed with light scattering portion (not shown), this light scattering portion is used to make the direction of propagation of light at random and be used for photoconduction to outgoing plane.This light scattering portion act as the unit towards the internal reflected light of light guide plate 5.As the means of reflection consider to use method at printing points figure on the outgoing plane opposing face 9, with outgoing plane opposing face 9 asperitiesization with the method that forms the fold face and on outgoing plane opposing face 9, form small sphere or concavo-convex method etc.
In addition, by with outgoing plane 11 asperitiesization of light guide plate 5 to form the fold face, can obtain and the identical effect of situation that reflector element is set on the outgoing plane opposing face 9 of light guide plate 5.Also promptly, incide light on the outgoing plane 11 of light guide plate 5 by at random by the formed concavo-convex direction of propagation of light that makes of outgoing plane 11 asperitiesization.Consequently, the part of light that incides outgoing plane 11 is towards the internal reflection of light guide plate 5, and light in addition injects to the outside of light guide plate 5 via outgoing plane 11.Thereby even form the fold faces at the outgoing plane 11 of light guide plate 5 only, outgoing plane opposing face 9 is not provided with under the situation of reflector element, can have the reflection function just as the dot pattern that is provided with at outgoing plane opposing face 9 yet.
Secondly, the led light source 4 of present embodiment is configured to be installed on the LED substrate 3 as shown in Figure 2 and inserts in the recess 6.This LED substrate 3 keeps led light source 4, and is formed with the circuitous pattern that is used for to led light source 4 supply capabilities.In addition, by being installed on the LED substrate 3 as metal-cored (Metal Core:MC) substrate, around the heat energy that sends from led light source 4 is delivered to enough effectively.Led light source 4 is by on the FPC (flexible printed wiring) that is installed in thin thickness, and around the heat energy that sends from led light source 4 enough further is delivered to effectively, and the physical dimension of surface light source apparatus also can reduce.
In addition, by using the led light source that has high-high brightness on general horizontal direction 4 as shown in Figure 3, the light that sends from led light source 4 incides with the incident angle of acute angle on the side of recess 6 of light guide plate 5.So, rise, rise in the brightness at peristome 1 place of housing 2 from the incident efficient of the light of led light source 4.
Secondly, the housing 2 of present embodiment is provided with reflector plate 10 in the inboard, make light not leak into the outside as far as possible, and makes light arrive peristome 1.This reflector plate 10 can use the material that in PP (polypropylene) or PET (polyethylene terephthalate), is mixed with the material of barium sulphate or titanium dioxide or in resin, is formed with micro air bubble, evaporation on the sheet metal have silver material, on sheet metal, be coated with the material of the coating that comprises titanium dioxide.In addition, reflector plate 10 preferably reflectivity be more than 90%.In addition, owing to by overlapping a plurality of reflector plates 10 reflectivity is improved, the brightness of the peristome 1 of housing 2 is risen.
And then, by outgoing plane side or outgoing plane opposition side printing points figure, can improve the Luminance Distribution (profile) of outgoing plane at reflector plate 10.In addition, implement coloured printing, thereby, can improve owing to the phenomenon that makes the change color that penetrates light away from light source by the light absorption of light guide plate 5 or the light absorption of reflector plate 10 by outgoing plane side or outgoing plane opposition side at reflector plate 10.Especially, owing to implement coloured printing by the outgoing plane opposition side at reflector plate 10, can make the passivation that influences to outgoing plane one side, delicate brightness irregularities or the irregular colour that therefore can proofread and correct outgoing plane are even.
Secondly, as shown in Figure 2, dispose diffuser plate 12 at the outgoing plane 11 (peristome 1 of housing 2) of light guide plate 5.This diffuser plate can use PET (polyethylene terephthalate), PMMA (acrylic acid) or PC resin plate or the such materials with light transmitting property of glass substrate such as (polycarbonate).In addition, in above-mentioned material, sneak into reflecting material or make surperficial asperitiesization, so that diffuser plate 12 has the function that makes the incident light scattering.Diffuser plate 12 by use has this function can access the surface light source apparatus with wide directive property.In addition, according to the surface light source apparatus structure, can not obtain desired display level sometimes yet, there is no need to be provided with especially diffuser plate 12 in this case even diffuser plate 12 is not set.
And then, as shown in Figure 2, the optical sheet set 13 that is made of a plurality of optical sheets is set on diffuser plate 12.This optical sheet set 13 becomes the structure by diffusion sheet clamping lens.In addition, improve at needs under the situation of brightness, use a plurality of lens to be combined in the direction of the prism of each sheet formation best.And then, under the diffusible situation that improves diffusion sheet, consider to use the method for the diffusion sheet more than 2.In addition, according to the light distribution characteristic of lens, also can use 1 or do not use lens.And then, also screening glass or polarisation reflector plate can be combined on the optical sheet set 13.In addition, the best sheet structure that becomes the best in view of desired brightness or light distribution characteristic etc. of the structure of optical sheet set 13.
Secondly, though do not illustrate among Fig. 1 and Fig. 2, on surface light source apparatus, dispose display panel.This display panel is thought of as the display panels of the birefringence of using liquid crystal or has printed the display panel etc. of character or pattern on transparent panel.Present embodiment uses the situation of the display device of display panels to describe for display panel hereinafter.
Here, display panels constitutes (not shown) by following: the counter substrate that is formed with dyed layer, light shield layer, opposite electrode etc. on substrate; At the tft array substrate that is formed with the thin film transistor (TFT) that becomes on-off element (below be also referred to as TFT), pixel electrode etc. on the substrate; Be used to keep the liner at the interval of counter substrate and tft array substrate; The encapsulant of counter substrate and tft array substrate is used to fit; The liquid crystal of clamping between counter substrate and tft array substrate; Inject the inlet seal member of liquid crystal; Make the oriented film of liquid crystal aligning; And Polarizer.In addition, in the present invention, owing to use existing display panels, thereby omit detailed explanation.In addition, on display device, possesses the circuit substrate (not shown) that is used to drive display panels.
Secondly, be provided with light quantity adjustment unit 7 in the bottom of recess 6.Fig. 4 illustrates near the sectional view the recess 6 that amplifies light guide plate 5.Light quantity adjustment unit 7 as shown in Figure 4 is made of reflector plate 20 and diffusion sheet 21.Reflector plate 20 can use the material that in PP (polypropylene) or PET (polyethylene terephthalate), is mixed with the material of barium sulphate or titanium dioxide or in resin, is formed with micro air bubble, evaporation on the sheet metal have silver material, on sheet metal, be coated with the material of the coating that comprises titanium dioxide.In addition, present embodiment is used the material that is formed with micro air bubble in the PET resin.
On the other hand, diffuser plate 21 can use PET (polyethylene terephthalate), PMMA (acrylic acid) or PC resin plate or the such materials with light transmitting property of glass substrate such as (polycarbonate).In addition, in above-mentioned material, sneak into reflecting material or make surperficial asperitiesization, so that diffuser plate 21 has the function that makes the incident light scattering.
The reflector plate 20 that present embodiment is used uses has the following reflector plate 20 that sees through characteristic: as shown in Figure 6, inciding the ratio that the full light (all incident lights) on the reflector plate 20 sees through is that total light transmittance is more than 2%.When using the reflector plate 20 of total light transmittance discontented 2%, then occur near led light source 4 or directly over the light that penetrates of outgoing plane 11 reduce, and produce the situation of brightness irregularities at outgoing plane 11.Therefore, by using total light transmittance is reflector plate 20 more than 2%, can adjust incide near the led light source 4 or directly over the light quantity of direct sunshine of outgoing plane 11, inhibition near the led light source 4 or directly over the minimizing of the light that penetrates of outgoing plane 11, prevent that outgoing plane 11 overall brightnesses are inhomogeneous.In addition, total light transmittance is 2% or more by using, the reflector plate 20 of preferred 4-6%, can suppress near the brightness irregularities of the outgoing plane 11 of led light source 4.And, by changing the total light transmittance of this reflector plate 20, can adjust the light quantity of the direct sunshine that incides outgoing plane 11, eliminate brightness irregularities.
And, by reflector plate 20 have will see through light as diffusion light at the diffusion function that outgoing plane 11 penetrates, can further suppress near the brightness irregularities of the outgoing plane 11 the led light source 4.For example, by using reflector plate 20, this reflector plate 20 uses the material that is formed with micro air bubble in the PET resin, thereby becomes roughly diffusion light fully at the light of reflector plate 20 places reflection, and the light that sees through also becomes roughly diffusion light fully.Because see through only roughly diffusion light fully, not only near the part led light source 4 has diffusion effect, and the whole face of reflector plate 20 shows same effect, therefore can suppress near the brightness irregularities of the outgoing plane 11 of led light source 4.And, even, also be difficult for taking place brightness irregularities, therefore can realize slim surface light source apparatus because led light source 4 shortens to the distance between the outgoing plane 11.
And then, on reflector plate 20, printed the dot pattern of light absorbing black in led light source 4 one sides, printed coloured dot pattern at led light source 4 opposition sides.In addition, though the dot pattern printing is to print Micropicture with black or coloured China ink on reflector plate 20, also can carry out with screen printing mode.And the shape of the dot pattern of printing, size, arrangement, deep or light, density, color etc. are preferably carried out optimization in view of the display level of the outgoing plane of planar display device.Fig. 7 illustrates the printing example of reflector plate 20.For reflector plate shown in Figure 7 20, be printed with the black color dots figure that homogeneous is arranged in led light source 4 one sides, and be printed with coloured dot pattern of concentrating arrangement at central part at led light source 4 opposition sides.Identical with reflector plate 20, also can on diffusion sheet 21, implement black or coloured printing.
As shown in Figure 5 and Figure 6, reflector plate 20 absorbs low wavelength light.Thus, the light by reflector plate 20 becomes yellowy light, for the outgoing plane 11 of light guide plate 5, the color difference between the part of light quantity adjustment unit 7 and the part in addition is set.Thus, in the present embodiment, implement coloured printing at led light source 4 opposition sides of reflector plate 20 especially.Thus, in the present embodiment, the irregular colour that can alleviate the outgoing plane 11 (peristome 1 of housing 2) of light guide plate 5 is spared.
And, though diffusion sheet 21 as shown in Figure 4 constitutes by 1, also can constitute by a plurality of.By using a plurality of diffusion sheets 21, further diffusion light, and can improve the display level of the outgoing plane 11 (peristome 1 of housing 2) of light guide plate 5.In addition, under the situation of the display level of the outgoing plane 11 (peristome 1 of housing 2) that only can fully guarantee light guide plate 5, also diffusion sheet 21 can be set by reflector plate 20.
And, though reflector plate 20 as shown in Figure 4 constitutes by 1, also can constitute by a plurality of.In this case, also can combination thickness or diverse reflector plate 20.And, using under the situation of a plurality of reflector plates 20, whether on each reflector plate 20, all implement the printing points figure, in view of the display level of the outgoing plane 11 (peristome 1 of housing 2) of light guide plate 5 carries out optimization.
Then, will the light that send from led light source 4 be described from outgoing plane 11 ejaculations of light guide plate 5 and until the path of inciding display panels.At first, the light that sends from led light source 4 directly or by 7 reflections of light quantity adjustment unit incides light guide plate 5 as shown in Figure 4.The light (α 1, α 2) of should be directly or inciding light guide plate 5 by 7 reflections of light quantity adjustment unit on one side on the border of light guide plate 5 and air layer repeatedly total reflection on one side at the internal communication of light guide plate 5.So, change the direction of propagation of light by some printing 22 (Fig. 4) scattered reflections of implementing at the outgoing plane opposing face 9 of light guide plate 5 at the light of light guide plate 5 internal communications.The variation of the direction of propagation by this light makes not satisfy the light of the critical angle on the border of light guide plate 5 and the air layer outgoing plane 11 from light guide plate 5 is penetrated.
In addition, though the light that does not satisfy the critical angle on the border of light guide plate 5 and air layer also penetrates beyond the outgoing plane 11 of light guide plate 5, this light is by reflector plate 10 (Fig. 2) reflection that is provided with at housing 2, and incides light guide plate 5 once more.And finally this light also penetrates from the outgoing plane 11 of light guide plate 5.
In the present embodiment, though being shaped as of light guide plate 5 is tabular, the invention is not restricted to this, the shape of light guide plate 5 also can be for along with the wedge-type shape away from led light source 4 thickness of slab attenuation.By making light guide plate 5 be this shape, can be effectively with the photoconduction propagated to outgoing plane 11.Thus, therefore the light quantity minimizing owing to reflector plate 10 reflections that are provided with by the side 8 in light guide plate 5 can reduce the reflection loss of reflector plate 10 generations of side 8, increases the ejaculation amount of outgoing plane 11.
And, from the light (β) of led light source 4 by reflector plate 20 by diffusion sheet 21 diffusions and incide light guide plate 5 from the bottom of recess 6.Finally penetrate owing to incide the light of light guide plate 5, so the utilization factor of light improves from the outgoing plane 11 of light guide plate 5.
Owing to compare with the light (α 1) that is directly incident on light guide plate 5 from led light source 4, incide the light (α 2) of light guide plate 5 by reflector plate 20 reflections, its incident angle towards light guide plate 5 mostly is the angle near the obtuse angle, therefore penetrates near the outgoing plane the led light source 4 11 easily.Thus, implement the dot pattern printing of black at the face of led light source 4 one sides of reflector plate 20, reduce reflected light by the dot pattern absorbing light that makes this black, can reduce the light that penetrates near the outgoing plane the led light source 4 11, near the brightness irregularities of the outgoing plane 11 the inhibition led light source 4.
And the surface light source apparatus of present embodiment changes for the brightness of proofreading and correct the led light source 4 in the outgoing plane 11, and implements the dot pattern printing of black at the face of led light source 4 one sides of reflector plate 20.Therefore, the surface light source apparatus of present embodiment can suppress the brightness irregularities of outgoing plane 11.
Here, as shown in Figure 6, be absorbed the light of short wavelength side by the light of reflector plate 20.Thus, in the surface light source apparatus that uses reflector plate 20, the light of long wavelength side also is that red composition becomes many and the generation irregular colour is spared.
Yet, in the surface light source apparatus of present embodiment, on the face of led light source 4 opposition sides of reflector plate 20, be printed with elimination by the such complementary color of the tonal variation of the light that causes by reflector plate 20 (for example blue).Therefore, in the surface light source apparatus of present embodiment, even by the irregular colour that can suppress to cause by the light quantity adjustment unit 7 that is provided with reflector plate 20.
In addition, in the light quantity adjustment unit 7 of present embodiment, dispose reflector plate 20, diffusion sheet 21 and light guide plate 5 every air layer respectively.But, by on each sheet, sticky material etc. being set, each sheet of fitting, can not be situated between has the configuration of air layer ground reflector plate 20, diffusion sheet 21 and light guide plate 5.By not being situated between air layer is arranged, just can eliminate the surface reflection that produces at the interface, and the light quantity that penetrates from the outgoing plane 11 of light guide plate 5 is increased, the light utilization efficiency of surface light source apparatus is improved at air layer.And, by fixing light quantity adjustment unit 7, can improve the light utilization efficiency of surface light source apparatus, and have the effect that prevents light amount regulating unit 7 activities that cause by vibration or impact etc. in the bottom of the recess 6 of light guide plate 5.
But the sticky material that each sheet uses etc. is preferably the material of transmitance more than 95%.And sticky material etc. are roughly the same with the refractive index of reflector plate 20, diffusion sheet 21 and light guide plate 5.Thus, can reduce in reflector plate 20, diffusion sheet 21 and light guide plate 5 direct reflection at the interface with sticky material.And, though be close to by sticky material between reflector plate 20, diffusion sheet 21 and the light guide plate 5 comprehensively, also can a part be close to.And, though be close to whole, also can only be close to a part of sheet by sticky material by sticky material.
And, in the present embodiment, though the flat shape of recess 6 is bottom (part of light amount regulating unit 7 is set) and the identical shape of edge part (inserting the part of led light source 4), but the invention is not restricted to this, also can adjust flat shape, so that display level the best of the outgoing plane 11 of light guide plate 5.
And then surface light source apparatus of the present invention also can be implemented mirror process, asperities processing, dot pattern printing or coloured printing etc. to the outgoing plane 11 or the outgoing plane opposing face 9 of light guide plate 5.By on the outgoing plane 11 of light guide plate 5 or outgoing plane opposing face 9, implementing asperities processing formation fold face, can further improve display level at outgoing plane 11 places of light guide plate 5.
And, in the present embodiment,, on the face of led light source 4 opposition sides of reflector plate 20, dispose color conversion sheet by replacing this coloured printing though on reflector plate 20, implement coloured printing, also can access same effect.In addition, this color conversion sheet for example, has the colored glass paper of transparent thin paper shape etc. for only making the sheet of the light transmission of specific wavelength.And, by using the high color conversion sheet of transmitance of comparing short wavelength side with the transmitance of long wavelength side, can alleviate the painted effect that causes by by above-mentioned reflector plate 20 thereby have.
And then the surface light source apparatus of present embodiment can increase the selective reflecting sheet on the optical sheet set 13 of configuration on the light guide plate 5.By light guide plate 5 sides the selective reflecting sheet is set in optical sheet set 13, the part of the light that can be penetrated from outgoing plane 11 by selective reflecting sheet reflection also makes it return to light amount regulating unit 7, thereby can increase the light that arrives light amount regulating unit 7, and effectively ` brightness irregularities or irregular colour are even.
In addition, this selective reflecting sheet is the sheet with the effect that promotes brightness.As the selective reflecting sheet, prismatic lens or reflective polaroid etc. are for example arranged, this prismatic lens has the prism shape that the light that makes approximate vertical incident returns to light amount regulating unit 7 sides via twice total reflection, and the sheet that this reflective polaroid utilization has polarizing properties is separated into reflected light and sees through light according to the polarization of incident light direction.
The display device of present embodiment constitutes the light that penetrates from the outgoing plane 11 of the light guide plate 5 of surface light source apparatus (peristome 1 of housing 2) by diffuser plate 12 and optical sheet set 13 and incide display panels.Display panels is by the orientation that changes liquid crystal layer that is switched on or switched off of the voltage realized by not shown on-off element, the light and the picture signal that incide display panels are modulated matchingly, shown in red (R), green (G) or blue (B).
In addition, under the situation that the monochromatic LED that sends redness (R), green (G) or blue (B) uses as light source, the half breadth of luminescent spectrum is narrow, and red (R), green (G), blue (B) luminescent spectrum in addition are seldom.So, the situation that has the cold-cathode tube of redness (R), green (G) or blue (B) luminescent spectrum in addition with the light source use is compared, and the LED of use bill coloured light has by absorb the colourity variation quantitative change tendency greatly that short wavelength side causes at reflector plate 20 places as the situation of light source.Thereby, use the irregular colour of not too being found out under the situation of cold-cathode tube to spare under light source uses the situation of LED of bill coloured light at light source and found out easily.To eliminate above-mentioned irregular colour even thereby the surface light source apparatus of present embodiment is by implementing coloured printing as mentioned above on reflector plate 20.
And present embodiment is although understand to use the situation of 1 led light source 4, but the invention is not restricted to this, can use a plurality of led light sources 4 under the big situation of the size of situation that needs brightness or peristome 1.And the position of led light source 4 is not limited to the middle body of housing 2, can be configured in only position according to the Luminance Distribution of outgoing plane 11.
As mentioned above, the surface light source apparatus of present embodiment since be provided with in the bottom of recess 6 have reflector plate 20, the light quantity adjustment unit 7 of diffusion sheet 21, therefore have can eliminate brightness irregularities or irregular colour is even and the utilization ratio height of light and face in the brightness homogeneity high, can have the effect of enough display levels.
(embodiment 2)
Fig. 8 illustrates the sectional view of the surface light source apparatus of present embodiment.In surface light source apparatus shown in Figure 8, light guide plate 5 has: be arranged on the corresponding position of led light source 4 on and hold the recess 6 of cylindrical shape of a part of led light source 4 and the recess 30 of the cylindrical shape that on the face relative, is provided with the face that recess 6 is set, also possess the bottom that is arranged on recess 30 and adjust light quantity adjustment unit 7 from the light of led light source 4.That is to say, in the light guide plate 5 shown in Figure 8, be arranged to the recess 30 of outgoing plane 11 sides recess 6 back-to-back in outgoing plane opposing face 9 one sides.And then, though light amount regulating unit 7 is arranged on the bottom of the recess 6 of outgoing plane opposing face 9 one sides in embodiment 1, be arranged on the bottom of the recess 30 of outgoing plane 11 sides in the present embodiment.
In addition, remove recess 30 is set in the structure of embodiment 1, beyond this recess 30 places configuration light amount regulating unit 7, the surface light source apparatus of present embodiment and embodiment 1 are same configuration.So, surface light source apparatus shown in Figure 8 pair provides identical symbol with surface light source apparatus identical construction element shown in Figure 2, and has omitted explanation.And, except that the distinctive action effect of surface light source apparatus of the present embodiment of following explanation, serve the same role effect with the surface light source apparatus of embodiment 1.
The surface light source apparatus of present embodiment when the assembling surface light source apparatus, can put light guide plate 5 configuration light amount regulating unit 7 later on by the outgoing plane 11 sides configuration recess 30 in light guide plate 5 on housing 2 and led light source 4.So, after the assembling surface light source apparatus, do not take out light guide plate and just can change light amount regulating unit 7, improve the assembling performance.
And, because by implement dot pattern printing or crimp shape processing in the bottom of recess 30, the light that penetrates from led light source 4 is further spread, so it is even and can improve display level to alleviate the brightness irregularities of outgoing plane 11 of light guide plate 5 or irregular colour.
And then, because by paste light amount regulating unit 7 in the bottom of recess 30, alleviated the surface reflection that the air layer by the interface of the bottom of recess 30 and light amount regulating unit 7 causes, so the brightness at outgoing plane 11 places of light guide plate 5 is risen.
And the flat shape of recess 30 is identical with the flat shape of recess 6, also can be similar shape.And then the flat shape of recess 30 also can be different with the flat shape of recess 6.And then the degree of depth of recess 30 also can be darker than the thickness of light amount regulating unit 7.And the side of recess 30 also can be crimp shape.In addition, the flat shape of recess 30 and the degree of depth are preferably carried out optimization in view of the display level of the outgoing plane 11 of light guide plate 5.
Secondly, though the flat shape with recess 30 is identical basically for the flat shape of light amount regulating unit 7, also can diminish with similar shape ground.And the flat shape of light amount regulating unit 7 is if the size that can be provided with in the bottom of recess 30 then also can be the shape different with the flat shape of recess 30.In addition, the flat shape of light amount regulating unit 7 is preferably carried out optimization in view of the display level of the outgoing plane 11 of light guide plate 5.
And, for the location of light amount regulating unit 7, also can paste not shown slide at the outgoing plane 11 of light guide plate 5.The best transmitance of this slide is more than 95%.
(embodiment 3)
Fig. 9 illustrates the skeleton diagram of the light amount regulating unit 7 employed reflector plates 20 of present embodiment.Reflector plate 20 shown in Figure 9 is the shape that has a plurality of holes 40 on the material of the reflector plate 20 of embodiment 1 explanation.In addition, the surface light source apparatus of present embodiment is except that using reflector plate 20 shown in Figure 9 in light amount regulating unit 7, identical with embodiment 1 and 2.So, omit explanation for the inscape beyond the reflector plate shown in Figure 9 20.And, except that the distinctive action effect of surface light source apparatus of the present embodiment of following explanation, serve the same role effect with the surface light source apparatus of embodiment 1.
The material of reflector plate 20 shown in Figure 9 and embodiment 1 explanation identical, use the material that in PP (polypropylene) or PET (polyethylene terephthalate), is mixed with the material of barium sulphate or titanium dioxide or in resin, is formed with micro air bubble, evaporation on the sheet metal have silver material, on sheet metal, be coated with the material of the coating that comprises titanium dioxide.In addition, the reflectivity of reflector plate 20 is preferably more than 90%.And, owing to can improve reflectivity, therefore have the effect of the brightness that promotes outgoing plane 11 by overlapping a plurality of reflector plates 20.
Though present embodiment is provided with a plurality of holes 40 on reflector plate 20,, can adjust the reflectivity or the transmitance of reflector plate 20 arbitrarily by size, quantity, arrangement, the shape in this hole 40.So, and adjusts the situation of reflectivity or transmitance and compare by implement printing on reflector plate 20, what be provided with that the reflector plate 20 in a plurality of holes 40 do not print being close to or inconvenience that the deterioration of ink etc. causes, so the reliability height.Thereby, use the surface light source apparatus of the reflector plate 20 that a plurality of holes 40 are set to become surface light source apparatus with low uncertainty in time.
(embodiment 4)
Figure 10 illustrates the light guide plate 5 of present embodiment and general positive map of reflector plate 20 (Figure 10 (a)) and sectional view (Figure 10 (b)).Though embodiment 1 use total light transmittance is the reflector plate 20 more than 2%, can control the value of the total light transmittance of reflector plate 20 according to various conditions.Present embodiment is used the reflector plate 20 with the total light transmittance value that satisfies formula 1.In addition, except that the distinctive effect of surface light source apparatus of the present embodiment of following explanation, serve the same role effect with the surface light source apparatus of embodiment 1.And all the structure with embodiment 1 is identical except that the structure light guide plate shown in Figure 10 5 and the reflector plate 20 for the surface light source apparatus of present embodiment.
Among Figure 10, the mean radius of establishing reflector plate 20 is r, and 20 distance is H from led light source 4 to reflector plate, and the light-emitting area of led light source 4 is S, and the light summation of led light source 4 is L, and the total light transmittance of reflector plate 20 is t.At first, the end angulation from the positive top of led light source 4 to reflector plate 20 is θ=tan
-1(r/H), the light quantity L1 that incides reflector plate 20 is expressed as L1=(1-cos θ) L.And the light quantity L2 that incides except that reflector plate 20 on the light guide plate 5 is expressed as L2=Lcos θ.
Because the area of reflector plate 20 is S1=π r
2So the quantity of light emission B1 of the per unit area of reflector plate 20 is expressed as t * (1-cos θ) L/ π r
2And, because the area S2=S-π r of the outgoing plane beyond the reflector plate 20
2, so the quantity of light emission B2 of the per unit area of the outgoing plane beyond the reflector plate 20 is expressed as Lcos θ/(S-π r
2).Thereby in order to suppress the brightness irregularities of surface light source apparatus, quantity of light emission B1 and quantity of light emission B2 need have the relation of B1 〉=B2.According to this relation, the value t of the total light transmittance of reflector plate 20 can obtain by formula 1.
(formula 1)
The surface light source apparatus of present embodiment satisfies the reflector plate 20 of formula 1 by use, by adjusting incide near the led light source 4 or directly over the light quantity of direct sunshine of outgoing plane 11, thereby can prevent the brightness irregularities of outgoing plane 11 integral body.
Claims (17)
1. surface light source apparatus is characterized in that possessing:
At least the housing that on one side, has peristome;
The light source that on the one side of the described housing relative, keeps with described peristome; And
In the light guide plate of the position configuration that covers described peristome and described light source,
Described light guide plate has: be arranged on the corresponding position of described light source and hold first recess of the part of described light source; And with second recess of the back-to-back setting of described first recess,
Also possess: be arranged on the bottom of described second recess and adjust light quantity adjustment unit from the light of described light source.
2. surface light source apparatus as claimed in claim 1 is characterized in that, described light quantity adjustment unit possesses the reflection of light sheet of reflection from described light source.
3. surface light source apparatus as claimed in claim 2 is characterized in that, it is the function that sees through more than 2% from the reflection of light function of described light source and total light transmittance that described reflector plate has reflection.
4. as claim 2 or 3 described surface light source apparatus, it is characterized in that described reflector plate has the diffusion function that makes the light diffusion that sees through.
5. as each described surface light source apparatus in the claim 1 to 3, it is characterized in that described light quantity adjustment unit also possesses the diffusion sheet that makes from the light diffusion of described light source.
6. as claim 2 or 3 described surface light source apparatus, it is characterized in that described reflector plate is implemented black printing on the face of described light source one side.
7. as claim 2 or 3 described surface light source apparatus, it is characterized in that, described reflector plate with the face of described light source opposition side on implement coloured printing.
8. surface light source apparatus as claimed in claim 5 is characterized in that, described diffusion sheet is implemented black printing on the face of described light source one side.
9. surface light source apparatus as claimed in claim 5 is characterized in that, described diffusion sheet with the face of described light source opposition side on implement coloured printing.
10. surface light source apparatus as claimed in claim 7 is characterized in that, described coloured blueness that is printed as.
11. surface light source apparatus as claimed in claim 9 is characterized in that, described coloured blueness that is printed as.
12. surface light source apparatus as claimed in claim 6 is characterized in that, described black printing is the dot pattern printing.
13. surface light source apparatus as claimed in claim 7 is characterized in that, described coloured dot pattern printing that is printed as.
14., it is characterized in that described reflector plate possesses a plurality of holes as claim 2 or 3 described surface light source apparatus.
15., it is characterized in that described light source is a light emitting diode as each described surface light source apparatus in the claim 1 to 3.
16., it is characterized in that described light source is a white light-emitting diode as each described surface light source apparatus in the claim 1 to 3.
17. a display device, it possesses: surface light source apparatus and the display panel that on the peristome of described surface light source apparatus, disposes,
In described surface light source apparatus, it possesses:
At least the housing that on one side, has described peristome;
The light source that on the one side of the described housing relative, keeps with described peristome; And
In the light guide plate of the position configuration that covers described peristome and described light source,
Described light guide plate possesses: be arranged on the corresponding position of described light source and hold first recess of the part of described light source; And with second recess of the back-to-back setting of described first recess,
Described surface light source apparatus also possesses: be arranged on the bottom of described second recess and adjust light quantity adjustment unit from the light of described light source.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005361208 | 2005-12-15 | ||
| JP2005361208 | 2005-12-15 | ||
| JP2006288512 | 2006-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101013227A CN101013227A (en) | 2007-08-08 |
| CN100565298C true CN100565298C (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100644165A Expired - Fee Related CN100565298C (en) | 2005-12-15 | 2006-12-15 | Surface light source apparatus and the display device of using it |
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| CN (1) | CN100565298C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2241800A4 (en) * | 2008-02-05 | 2011-01-26 | Sharp Kk | Illuminating device and liquid crystal display device |
| JP5401689B2 (en) * | 2009-10-01 | 2014-01-29 | 株式会社オプトデザイン | Illumination light color correction method, light source module employing the color correction method, and illumination device using the light source module |
| KR101020923B1 (en) * | 2010-01-07 | 2011-03-09 | 엘지이노텍 주식회사 | Optical assembly, backlight unit having the same, and display apparatus thereof |
| JP2013037788A (en) * | 2011-08-03 | 2013-02-21 | Opt Design:Kk | Plane illumination light source device using light-emitting body |
| CN102636825B (en) * | 2012-03-09 | 2015-01-07 | 京东方科技集团股份有限公司 | Method and system for manufacturing reflection diaphragm |
| CN102620217A (en) * | 2012-04-12 | 2012-08-01 | 深圳市华星光电技术有限公司 | Backlight module and corresponding liquid crystal display device |
| JP6293445B2 (en) * | 2013-09-26 | 2018-03-14 | 株式会社Pfu | Light source unit of image reading apparatus and image reading apparatus including the light source unit |
| CN204534179U (en) * | 2015-01-19 | 2015-08-05 | 苏州欧普照明有限公司 | A kind of lighting device |
| US11067735B2 (en) * | 2017-08-29 | 2021-07-20 | Corning Incorporated | Direct-lit backlight unit with 2D local dimming |
| CN107993722B (en) * | 2017-12-05 | 2021-12-07 | 天津大学 | Rapid extraction method for photon distribution in medium under lattice light source |
| CN112531095A (en) * | 2017-12-08 | 2021-03-19 | 首尔半导体株式会社 | Backlight unit |
| JP2019121547A (en) * | 2018-01-10 | 2019-07-22 | シャープ株式会社 | Luminaire and display unit |
| CN109828410A (en) * | 2018-08-03 | 2019-05-31 | 海迪科（南通）光电科技有限公司 | A kind of display of novel LED backlight mould group |
| WO2020088292A1 (en) * | 2018-10-31 | 2020-05-07 | 欧普照明股份有限公司 | Light distribution element, light source assembly, and illumination lamp |
| CN114846272A (en) * | 2019-12-26 | 2022-08-02 | 美蓓亚三美株式会社 | Planar lighting device |
-
2006
- 2006-12-15 CN CNB2006100644165A patent/CN100565298C/en not_active Expired - Fee Related
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| CN101013227A (en) | 2007-08-08 |
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