CN101233363A - Surface light source device and prism sheet - Google Patents
Surface light source device and prism sheet Download PDFInfo
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- CN101233363A CN101233363A CNA2006800282590A CN200680028259A CN101233363A CN 101233363 A CN101233363 A CN 101233363A CN A2006800282590 A CNA2006800282590 A CN A2006800282590A CN 200680028259 A CN200680028259 A CN 200680028259A CN 101233363 A CN101233363 A CN 101233363A
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Abstract
The present invention provides a surface light source device being higher in luminance than conventional surface light sources and high in front-direction light condensing feature. The surface light source device, wherein the angle Theta F</SUB> of the oblique side on the light source side of the prism of a first prism sheet disposed opposite to the outgoing surface of a light guide satisfies the expression (1), the angle Theta B<SUB>1</SUB> of the oblique side on the opposite side of the light source satisfies the expression, the angle Theta F <SUB>I of the oblique side on the light source side of the prism of the i-th prism sheet (i is an integer of at least 2) disposed on the light outgoing side of the first prism sheet satisfies the expression (3), and the angle B<SUB>i</SUB> of the oblique side on the opposite side of the light source satisfies the expression (4), ThetaF<SUB>1</SUB><=Phi<SUB>2</SUB>...(1)(Phi<SUB>2</SUB>=sin<SUP>-1</SUP>(n<SUB>1</SUB><SUP>-1</SUP>sin Phi<SUB>1</SUB>), n<SUB>1</SUB> is first refractivity of first edge glass plate, Phi<SUB>1</SUB> is peak value optical angle of emission optical of leaded light body, 90 degree-Phi<SUB>2</SUB>-Phi<SUB>c1</SUB><=Theta B<SUB>1</SUB>...(2) (Phi<SUB>c1</SUB> is critical angle of first edge glass plate ), ThetaF<SUB>i</SUB><=Phi<SUB>6</SUB>...(3)( Phi<SUB>6</SUB>=sin<SUP>-1</SUP>(n<SUB>i</SUB><SUP>-1</SUP>sinPhi<SUB>5</SUB>), n<SUB>i</SUB> is refractivity of i-th edge glass plate, Phi<SUB>5</SUB> is peak value optical angle of emission optical from i-1 edge glass plate), 90 degree-Phi<SUB>6</SUB>-Phi<SUB>ci</SUB><=Theta B<SUB>i</SUB>...(4)(Phi<SUB>ci</SUB> is critical angle of i-th edge glass plate).
Description
Technical field
The present invention relate to a kind of be used in liquid crystal indicator etc. planar light source device and in this planar light source device employed prism plate.
Background technology
The liquid crystal indicator utilization is at the backlight that the back side disposed of liquid crystal panel, makes light incident and carries out the demonstration of image.Backlight is the member that consumes the electric power maximum in liquid crystal indicator, particularly in portable machines such as portable phone, portable game machine, the length that drives with service time of battery is had bigger influence.In order to use the driving battery of these portable machines for a long time, need can not make the briliancy decline of backlight and reduce it as much as possible to consume electric power.Promptly, need following research: promptly, in backlight, shoot out light to frontal as far as possible from light source.
What here, Fig. 1 represented is an example that is mainly used in the backlight 1 that light source is configured in type on the side of portable machine.The light that penetrates from light source 4 incides light conductor 3 through light conductor incident section 5.The light that incides light conductor 3 along inclined direction penetrates, and by being configured in the top prism plate 2 of light conductor 3, direction is become frontal and ejaculation.In this backlight 1, penetrate to frontal expeditiously in order to make light, importantly prism plate (first prism plate) 2 from light source 4.
The structure of variety of way is proposed to have about prism plate (first prism plate) 2, even and especially the direction of prism facets is defined as a certain side up and down, in the type that prism facets is used up for example at Japanese documentation: the spy opens flat 8-160204 communique, Japanese kokai publication hei 7-201217 communique, international disclose record to some extent in No. 96/10148 brochure etc., on the other hand, in the type that prism facets is used down for example at Japanese documentation: the spy opens flat 8-262441 communique, Te Kaiping 8-271705 communique, record and narrate to some extent in the Te Kaiping 11-084111 communique etc.
Yet, in prism plate (first prism plate) 2, expeditiously direction is transformed into frontal in order to make light, the most important thing is the size of prism vertex angle.In above-mentioned cited document, though relevant for the setting range of prism vertex angle and the record of computational methods, but mention by in the inclination on the inclined-plane of prism and the prism and near the relation of the light going direction the prism, decide the content of the condition that the drift angle of prism satisfies, have only the Japanese documentation spy to open flat 8-160204 communique.Utilize Fig. 2 to be described simply.
Fig. 2 is at the outgoing plane side of light conductor 3 cutaway view with the prism of the 1st prism plate 2 of relative configuration with the mode of light conductor almost parallel.From the peak light 12a of the ejaculation light of light conductor 3 with the normal 9 angulation φ of the outgoing plane of light conductor 3
1Incide first prism plate 2.At this moment, the hypotenuse angulation θ F of the normal 9 of the outgoing plane of light conductor 3 and light source side
1Satisfy formula (5).
0°≤θF
1≤φ
2+10°...(5)
(in formula (5), φ
2=sin
-1(n
-1Sin φ
1), n is the refractive index of the material of formation prism.)
According to formula (5), can suppress peak light from the ejaculation light of light conductor and contact with the hypotenuse 10a of light source side and total reflection takes place, and by the opposite hypotenuse 11a of light source side and as scattered light 14, the problem that penetrates along the direction in non-front.
Open in the flat 8-160204 communique the Japanese documentation spy and to also have following record: promptly, be 0 ° with the normal angulation from the outgoing plane of the peak light 13a of the ejaculation light of the hypotenuse of the opposite side with light source of first prism plate and light conductor, promptly peak light is along the θ B of frontal ejaculation situation
1Value be the center ± 10 ° scope in decision θ B
1Thus, can suppress on the hypotenuse 11a opposite, to produce total reflection, and depart from the problem of frontal with light source side from the peak light of the ejaculation light of light conductor.
In above example, suppose only to use the condition of first prism plate decision prism vertex angle.Promptly, incide second prism plate and more thereon under the situation of the prism plate of configuration, be not used to determine the condition of the drift angle of these prism plates in the peak light of the light that penetrates from first prism plate.
Summary of the invention
The purpose of this invention is to provide a kind of and existing planar light source device and compare planar light source device, and provide a kind of to the high planar light source device of the optically focused of frontal and be used in prism plate in this planar light source device with higher briliancy.
In order to solve above-mentioned problem, relate to planar light source device of the present invention and possess light source, with at least one side as the plane of incidence and have light conductor with the outgoing plane of above-mentioned plane of incidence approximate vertical, and prism plate, wherein, the face of the opposite side of the face with being formed with prism of above-mentioned prism plate is configured to the outgoing plane almost parallel with above-mentioned light conductor, and above-mentioned prism is configured to the plane of incidence almost parallel with above-mentioned light conductor, in the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of above-mentioned prism plate, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
1Satisfy formula (1), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
1Satisfy formula (2),
θF
1≤φ
2...(1)
(in formula (1), φ
2=sin
-1(n
1 -1Sin φ
1), here, n
1Be the refractive index of the material of the prism that forms above-mentioned prism plate, φ
1Expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor and above-mentioned light conductor.)
90°-φ
2-φ
c1≤θB
1...(2)
(in formula (2), φ
C1=sin
-1(n
1 -1) expression above-mentioned prism plate critical angle.)
Above-mentioned planar light source device is characterised in that, expects above-mentioned angle θ F
1Satisfy formula (1a), above-mentioned angle θ B
1Satisfy formula (2a),
θF
1≤φ
2-δ
1...(1a)
(in formula (1a), δ
1Expression is from half value of the half range value of the ejaculation light of above-mentioned light conductor.)
90°-φ
2-φ
c1+δ
2≤θB
1...(2a)
(in formula (2a), δ
2Expression from the peak light of the ejaculation light of above-mentioned light conductor with the normal angulation φ of the outgoing plane of above-mentioned light conductor
1Incide above-mentioned prism plate, similarly from the peak light of the ejaculation light of the normal angulation of above-mentioned light conductor outgoing plane with the normal angulation φ of above-mentioned light conductor outgoing plane
2The value of half of the half range value of the light after refraction on the above-mentioned prism plate.)。
In addition, so-called prism plate is abreast to dispose a plurality of with predetermined distance the prism of regulation shape on the one side of transparent optical sheet and form.And so-called prism is parallel, is meant that the crest line along long side direction of prism is parallel.
Expect above-mentioned angle θ F
1Satisfy formula (1b), above-mentioned angle θ B
1Satisfy formula (2b),
θF
1≤φ
2-δ
1×2...(1b)
90°-φ
2-φ
c1+δ
2×2≤θB
1...(2b)。
Planar light source device of the present invention is characterised in that in above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is below 30 °.
Be desirably in the above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is more than 15 ° below 30 °.
Be desirably in the above-mentioned section, the ejaculation light distribution of above-mentioned light conductor is that the ejaculation angle of peak value is more than 60 °.
The spacing of expectation prism is more than the 30 μ m.
Relating to prism plate of the present invention is the prism plate that is used in the above-mentioned planar light source device.
And, relate to planar light source device of the present invention and possess light source, with at least one side as the plane of incidence and have light conductor with the outgoing plane of above-mentioned plane of incidence approximate vertical, and at least 2 prism plates, wherein, the face that is formed with prism of above-mentioned prism plate is configured along equidirectional, and the face of the opposite side of the face with being formed with prism of above-mentioned prism plate is configured to outgoing plane almost parallel with above-mentioned light conductor, and above-mentioned prism is configured to plane of incidence almost parallel with above-mentioned light conductor, in the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of first prism plate of and configuration relative with the ejaculation of above-mentioned light conductor, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
1Satisfy formula (1), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
1Satisfy formula (2), in the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of i the prism plate (i is the integer more than 2) of the ejaculation light side that is disposed at above-mentioned first prism plate, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
iSatisfy formula (3), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
iSatisfy formula (4), θ F
1≤ φ
2... (1)
(in formula (1), φ
2=sin
-1(n
1 -1Sin φ
1), here, n
1Be the refractive index of the material of the prism that forms first prism plate, φ
1=sin
-1(n
1 -1) expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor and above-mentioned light conductor.)
90°-φ
2-φ
c1≤θB
1...(2)
(in formula (2), φ
C1Represent the critical angle of first prism plate.)
θF
i≤φ
6...(3)
(in formula (3), φ
6=sin
-1(n
i -1Sin φ
5), here, n
iBe the refractive index of the material of the prism that forms i prism plate, φ
5Expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of i-1 prism plate and above-mentioned light conductor.)
90°-φ
6-φ
ci≤θB
i...(4)
(in formula (4), φ
Ci=sin
-1(n
i -1) expression i prism plate critical angle.)。
Planar light source device of the present invention is characterised in that, above-mentioned angle θ F
1, θ B
1, θ F
i, θ B
iSatisfy following formula (1a), formula (2a), formula (3a) and formula (4a),
θF
1≤φ
2-δ
1...(1a)
(in formula (1a), δ
1Expression is from half value of the half range value of the ejaculation light of above-mentioned light conductor.)
90°-φ
2-φ
c1+δ
2≤θB
1...(2a)
(in formula (2a), δ
2Expression from the peak light of the ejaculation light of above-mentioned light conductor with the normal angulation φ of the outgoing plane of above-mentioned light conductor
1Incide above-mentioned prism plate, similarly with from the peak light of the ejaculation light of the normal angulation of above-mentioned light conductor outgoing plane with the normal angulation φ of above-mentioned light conductor outgoing plane
2The value of half of the half range value of the light after refraction on the above-mentioned prism plate.)
θF
i≤φ
6-δ
3...(3a)
(in formula (3a), δ
3Expression is from half value of the half range value of the ejaculation light of i-1 prism plate.)
90°-φ
6-φ
ci+δ
4≤θB
i...(4a)
(in formula (4a), δ
4Expression from the peak light of the ejaculation light of i-1 prism plate with the normal angulation φ of the outgoing plane of above-mentioned light conductor
5Incide on i the prism plate, similarly with the normal angulation φ of above-mentioned light conductor outgoing plane
6The value of half of the half range value of the light after the refraction.)。
Expect above-mentioned angle θ F
1, θ B
1, θ F
i, θ B
iSatisfy following formula (1b), formula (2b), formula (3b) and formula (4b),
θF
1≤φ
2-δ
1×2...(1b)
90°-φ
2-φ
c1+δ
2×2≤θB
1...(2b)
θF
i≤φ
6-δ
3×2...(3b)
90°-φ
6-φ
ci+δ
4×2≤θB
i...(4b)。
Be desirably in the above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is below 30 °.
Be desirably in the above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is more than 15 ° below 30 °.
Be desirably in the above-mentioned section, the ejaculation light distribution of above-mentioned light conductor is that the ejaculation angle of peak value is more than 60 °.
The spacing of expectation prism is more than the 30 μ m.
Relating to prism plate of the present invention, is i the prism plate that is used in the above-mentioned planar light source device.
According to the present invention, can provide a kind of and existing planar light source device to compare planar light source device, and provide a kind of to the high planar light source device of the optically focused of frontal and be used in prism plate in this planar light source device with higher briliancy.
Description of drawings
Fig. 1 is the figure of an example that expression is configured in light source the backlight of side type.
Fig. 2 is the cutaway view of the prism of first prism plate.
Fig. 3 is the figure of an example of expression planar light source device of the present invention.
Fig. 4 (a) is the cutaway view of prism of second or i prism plate of planar light source device of the present invention, and Fig. 4 (b) is the cutaway view of prism of first prism plate of planar light source device of the present invention.
Fig. 5 is illustrated in the ejaculation characteristic of the light conductor 1 that uses among the embodiment 1 of planar light source device of the present invention.
Fig. 6 represents the briliancy measurement result of the embodiment 1 and the comparative example 1 of planar light source device of the present invention.
Fig. 7 is illustrated in the ejaculation characteristic of the light conductor 2 that uses among the embodiment 2 of planar light source device of the present invention.
Fig. 8 represents the briliancy measurement result of the embodiment 2 and the comparative example 1 of planar light source device of the present invention.
Fig. 9 is illustrated in the ejaculation characteristic of the light conductor 3 that uses among the embodiment 3 of planar light source device of the present invention and the embodiment 4.
Figure 10 represents the briliancy measurement result of the embodiment 3 and the comparative example 1 of planar light source device of the present invention.
Figure 11 represents the briliancy measurement result of the embodiment 4 and the comparative example 1 of planar light source device of the present invention.
Figure 12 is illustrated in the ejaculation characteristic of the light conductor 4 that uses in the embodiment 5 of planar light source device of the present invention and comparative example 1, comparative example 2 and the comparative example 3.
Figure 13 represents the briliancy measurement result of the embodiment 5 and the comparative example 1 of planar light source device of the present invention.
Figure 14 represents the briliancy measurement result of embodiment 5 and comparative example 1, comparative example 2 and the comparative example 3 of planar light source device of the present invention.
The specific embodiment
Below, utilize accompanying drawing that embodiments of the present invention are described in detail.
The present invention as shown in Figure 3, be characterized as, possess light source 4, to 1 side of major general as the plane of incidence and have in the planar light source device 1 with the prism plate 2a of 3, at least 2 of the light conductors of the outgoing plane of above-mentioned plane of incidence approximate vertical and prism plate 2b, in order to change the direction of light that penetrates and incide the first prism plate 2a from light source 4 expeditiously through light conductor 3, and increase the ratio of the light that penetrates along the frontal of planar light source device 1, and realize the optimization of the prism shape of at least 2 prism plate 2a, prism plate 2b.Below, utilize Fig. 4 to the path of the light of at least 2 prism plate 2a, the prism plate 2b of planar light source device of the present invention with determine the method for the prism shape of above-mentioned prism plate to describe in view of the above.Fig. 4 be illustrated in the section with both sides' approximate vertical of the plane of incidence of above-mentioned light conductor 3 and outgoing plane, at least 2 prism plate 2a, the prism shape of prism 2b.In fact, phenomenons such as refraction in the prism and total reflection are to occur on the inclined-plane of prism, but here for angle is discussed, and the inclined-plane of prism is expressed as hypotenuse in Fig. 4, section is expressed as straight line in Fig. 4.
Shown in Fig. 4 (b), from the peak light 12a of the ejaculation light of light conductor 3 with the normal 9 angulation φ of the outgoing plane of light conductor 3
1Incide the first prism plate 2a, similarly, become with normal 9 angulation φ 2 refractions of the outgoing plane of light conductor 3 after the peak light 15a of light.At this moment, φ
2Can obtain by formula (6).
sinφ
1＝n
1sinφ
2...(6)
Here, n
1Refractive index for the material of the prism that forms the 1st prism plate.The peak light 15a of this refract light is penetrated in the hypotenuse 11a of an opposite side with light source of the prism of first prism plate refraction and from first prism plate.At this moment,, then produce total reflection and scattering, final can the ejaculation and to become the possibility of the light that diminishes vector big along the frontal of planar light source device 1 if the peak light 15a of refract light incides the hypotenuse 10a of light source side of the prism of first prism plate.In order to prevent this phenomenon, the normal 9 formed angle θ F of the outgoing plane of hypotenuse 10a and above-mentioned light conductor 3
1, need satisfy formula (1).
θF
1≤φ
2...(1)
On the other hand, the peak light 15a of refract light with straight line φ that 16a is become perpendicular to hypotenuse 11a
3 Angle incide hypotenuse 11a, similarly, with form φ perpendicular to the straight line 16a of hypotenuse 11a
4Angle and become the peak light 13a that penetrates light and penetrate.φ
4Can obtain by formula (7).
n
1sinφ
3＝sinφ
4...(7)
At this moment, if the peak light 15a of refract light produces total reflection at hypotenuse 11a, then finally might be in the direction generation scattering that is difficult to the frontal ejaculation of planar light source device 1.So, for the peak light 15a that do not make refract light in hypotenuse 11a total reflection, the normal 9 of the outgoing plane of light conductor 3 and hypotenuse 11a angulation θ B
1, need satisfy formula (2).
90°-φ
2-φ
c1≤θB
1...(2)
Here, φ
C1Represent the critical angle of first prism plate.By the above as can be known, the θ F of the prism of first prism plate
1And θ B
1By formula (1) and formula (2) decision.
Below, the method for the shape of the prism that determines i prism plate is described.Here, i is the integer more than 2.In addition, Fig. 3 represents to be furnished with the planar light source device of 2 prism plates, and represents the section of 2 prism plates with this in Fig. 4, but because this is equivalent to i is 2 situation, even so employed in the following description symbol about i prism plate, also uses the structure of Fig. 4 in the same old way.
Shown in Fig. 4 (a), from the peak light 12b of the ejaculation light of i-1 prism plate with the normal 9 angulation φ of the outgoing plane of light conductor 3
5Incide i prism plate 2b, similarly, become with the normal 9 angulation φ of the outgoing plane of light conductor 3
6The peak light 15b of the light after the refraction.Here, φ
5Can obtain by formula (8).And, φ
6Can obtain by formula (9).
φ
5＝90°-φ
4-θB
1...(8)
sinφ
5＝nisinφ
6...(9)
Here, n
iRefractive index for the material of the prism that forms i prism plate of the mat woven of fine bamboo strips.Make the peak light 15b of this refract light reflect and penetrate from i prism plate at the hypotenuse 11b of an opposite side with light source of the prism of i prism plate.At this moment,, then produce total reflection and scattering, final can the ejaculation and to become the possibility of the light that diminishes vector big along the frontal of planar light source device 1 if the peak light 15b of refract light is incident to the hypotenuse 10b of light source side of the prism of i prism plate.In order to prevent this phenomenon, the normal 9 angulation θ F of the outgoing plane of hypotenuse 10b and above-mentioned light conductor 3
i, need satisfy formula (3).
θF
i≤φ
6...(3)
On the other hand, the peak light 15b of refract light with straight line φ that 16b is become perpendicular to hypotenuse 11b
7 Angle incide hypotenuse 11b, similarly, with straight line φ that 16b is become perpendicular to hypotenuse 11b
8Angle become the peak light 13b that penetrates light and penetrate.φ
8Can obtain by formula (10).
n
isinφ
7＝sinφ
8...(10)
At this moment, if the peak light 15b of refract light produces total reflection on hypotenuse 11b, then finally might be difficult on the direction that the frontal of planar light source device 1 penetrates, scattering to take place.So, produce total reflection, the normal 9 of the outgoing plane of light conductor 3 and hypotenuse 11b angulation θ B for the peak light 15b that does not make refract light at hypotenuse 11b
i, need satisfy formula (4).
90°-φ
6-φ
ci≤θB
i...(4)
Here, φ
CiRepresent the critical angle of i prism plate.When normal 9 angulations of the outgoing plane of peak light 13b that makes the light that is penetrated by refraction on hypotenuse 11b and light conductor 3 are φ
9The time, φ
9Can obtain by formula (11).
φ
9＝90°-φ
8-θB
i...(11)
By the above as can be known, the θ F of the prism of first prism plate
iAnd θ B
iCan be by formula (3) and formula (4) decision.
In addition, in fact has the ejaculation angular distribution from the ejaculation light of light conductor 3 or from the ejaculation light of i-1 prism plate 2a.Consider this situation, wish θ F
1, θ B
1, θ F
iAnd θ B
iSatisfy following formula (1a), formula (2a), formula (3a) and formula (4a).
θF
1≤φ
2-δ
1...(1a)
90°-φ
2-φ
c1+δ
2≤θB
1...(2a)
θF
i≤φ
6-δ
3...(3a)
90°-φ
6-φ
ci+δ
4≤θB
i...(4a)
Here, δ
1Expression is from half value of the half range value of the ejaculation light of light conductor 3, δ
2Expression from the peak light of the ejaculation light of light conductor 3 with the normal 9 angulation φ of the outgoing plane of light conductor 3
1Incide the first prism plate 2a, similarly with the normal 9 angulation φ of the outgoing plane of light conductor 3
2The value of half of the half range value of the light after the refraction, δ
3Expression is from half value of the half range value of the ejaculation light of i-1 prism plate, and, δ
4Expression from the peak light 12b of the ejaculation light of i-1 prism plate with the normal 9 angulation φ of the outgoing plane of light conductor 3
5Incide i prism plate 2b go up, similarly with the normal 9 angulation φ of light conductor 3 outgoing planes
6The value of half of the half range value of the light after the refraction.
Have again, because existence is from the half range value condition of enlarged of the ejaculation light of light conductor 3, so more expectation makes θ F
1, θ B
1, θ F
iAnd θ B
iSatisfy following formula (1b), formula (2b), formula (3b) and formula (4b).
θF
1≤φ
2-δ
1×2...(1b)
90°-φ
2-φ
c1+δ
2×2≤θB
1...(2b)
θF
i≤φ
6-δ
3×2...(3b)
90°-φ
6-φ
ci+δ
4×2≤θB
i...(4b)
In order to satisfy above this relation, be below 30 ° from the photodistributed half range value of the ejaculation of light conductor 3.Thus, can determine to satisfy above-mentioned formula (1a), formula (2a), formula (3a) and formula (4a), or the θ F of the relation of formula (1b), formula (2b), formula (3b) and formula (4b)
1, θ B
1, θ F
iAnd θ B
iScope.
The photodistributed half range value of ejaculation of expecting the above-mentioned light conductor 3 of planar light source device 1 of the present invention is more than 15 ° below 30 °.The photodistributed half range value of ejaculation of expecting above-mentioned light conductor 3 is that the reason more than 15 ° is, has to a certain degree expansion for making ejaculation angular distribution from the ejaculation light of light conductor 3, to guarantee the ratio of available light.If 15 ° of the photodistributed half range value of the ejaculation of above-mentioned light conductor 3 less thaies, then at least 2 prism plate 2a, prism plate 2b, in any case change direction expeditiously, the ratio of available light is because initial just few, so can't guarantee finally the aequum of the light that the frontal to planar light source device 1 penetrates.
The ejaculation light distribution of expecting the above-mentioned light conductor 3 of planar light source device 1 of the present invention is that peak value ejaculation angle is more than 60 °.This be because, if from the normal 9 angulation φ of the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor 3 and above-mentioned light conductor 3
1Value be more than 60 °, then in first prism plate, make the refract light that has 15a in the peak light arrive hypotenuse 11a easily.If normal 9 angulation φ from the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor 3 and above-mentioned light conductor 3
160 ° of value less thaies, then in first prism plate, the refract light that has 15a in the peak light arrives hypotenuse 10a easily, the result produces total reflection at hypotenuse 10a, finally might not can penetrate to the frontal of planar light source device 1.
The spacing of expecting the prism of planar light source device of the present invention is more than the 30 μ m.This be because, in the planar light source device 1 of being furnished with 2 prism plate 2a, prism plate 2b at least, but make ejaculation light from above-mentioned light conductor 3 in above-mentioned 2 prism plate 2a, prism plate 2b, can not produce the beam split high efficiency refraction that is caused because of diffraction etc. at least, thereby its frontal to planar light source device 1 is penetrated.If the spacing of prism (pitch) less than 30 μ m then produce the beam split that is caused because of diffraction etc., under the state of keeping from the ejaculation light wavelength wave spectrum of above-mentioned light conductor 3, be difficult to make its frontal to penetrate to planar light source device 1.
As the preparation method of prism shape, though the also favourable method of directly describing with electron beam and laser etc. because this method deficiency aspect mass production, is carried out transfer printing and the method for making so be actually employing from former dish.Preparation method as former dish, the method of utilizing cutter to make with mechanical processing method is arranged, at coating electron beam on the substrate with resist and carry out the method for digging plane again with RIE after electron beam is drawn, with the X ray radiating light expose, the method for video picture, with the pattern of progressive series of greys mask expose, the method for video picture etc.
Form with the method on the material as prism shape is transferred to prism from former dish, extrusion molding, injection molding forming, thermal transfer and UV light transfer printing etc. are arranged.
With regard to light conductor 3, on the face of reflecting plate one side of above-mentioned light conductor 3, be provided for changing mechanism from the direction of light of plane of incidence incident, the light that changes after the direction carries out total reflection repeatedly in the inside of above-mentioned light conductor 3, and promptly has the light of peak value on specific direction and penetrate as the light with directive property.There is the method that is provided with pip in the mechanism that is used to change direction of light as being arranged on the face of reflecting plate one side of above-mentioned light conductor 3 or is provided with method of the ditch that is known as reflection groove etc.Pip is to utilize the method coating that is known as screen printing or injection with TiO
2Or BaSO
4Deng optically do not have absorbability and high pigment and the propylene of reflectivity is that adhesive carries out the reflectance ink that mixing forms.On the other hand, being known as the ditch of reflection groove and the prism of prism plate similarly adopts from the preparation method of former dish transfer printing.Preparation method as former dish, the method of utilizing cutter to make with mechanical processing method is arranged, at coating electron beam on the substrate with resist and carry out the method for digging plane again with RIE after electron beam is drawn, with the X ray radiating light expose, the method for video picture, with the pattern of progressive series of greys mask expose, the method for video picture etc.Method as on the material that prism shape is transferred to prism formation usefulness from former dish has extrusion molding, injection molding forming, thermal transfer and UV light transfer printing etc.In the present invention, serve as main enforcement mainly in the mode that reflection groove is set.
Also can be on the outgoing plane of above-mentioned light conductor 3 integrally formed holography diffusion patterned.Above-mentioned holography is diffusion patterned to have the briliancy that makes from the ejaculation light of the light conductor 3 roughly uniform performance that distributes.
Reflecting plate 7 is used to reflect pip or the reflection groove be not located on the above-mentioned light conductor 3 and reflects the light that passes to the greatest extent, and it is turned back in the light conductor 3 once more, thereby improves the utilization ratio from the light of light source.With regard to reflecting plate 7, following preparation method is arranged: promptly, on the one side of matrix material film that by mylar, allyl resin, polycarbonate resin, vinyl chloride resin, Polymethacrylimide is mades such as resin, utilize sputter or evaporation and the method for making film with reflecting properties.As film, silver, aluminium etc. are arranged with reflecting properties.On the other hand, as reflecting plate, also can use mylar, allyl resin, polycarbonate resin, vinyl chloride resin, Polymethacrylimide is high resin expanded of the transparency such as Romp polymer hydropolymer of resin, polyvinyl resin, acrylic resin, ethylene vinyl acetate resin, polystyrene resin, norborneol alkene monomer and the fine foaming body made.At this moment, bubble is independent foaming structure, the mean value less than 10 μ m of the diameter of bubble.
As light source 4, the situation of utilizing one or more LED (Light Emitting Diode) formation is arranged and utilize a kind of situation that is known as the diameter of cold-cathode tube for the fluorescent lamp of number mm degree.
Is purpose to the incident section 5 of light conductor with the inhomogeneous of light of eliminating from above-mentioned light source 4, is arranged at the structure 3 the plane of incidence and that have diffusion from light source 4 to light conductor.Specifically, dispose prism or set-point in mode with the plane of incidence subtend of above-mentioned light conductor 3.
As the reflecting properties 6 at the light source back side, can be in the material same with said reflection plate 7, promptly by mylar, allyl resin, polycarbonate resin, vinyl chloride resin, Polymethacrylimide is to utilize sputter or evaporation on the one side of matrix material film of mades such as resin and the resin that is made into the film with reflecting properties, maybe will make by mylar, allyl resin, polycarbonate resin, vinyl chloride resin, Polymethacrylimide is a resin, polyvinyl resin, acrylic resin, ethylene vinyl acetate resin, polystyrene resin, high resin expanded of the transparencys such as the Romp polymer hydropolymer of norborneol alkene monomer and the fine foaming body made is arranged on the back side of light source 4 in the mode of surrounding above-mentioned light source 4.Thus, utilize above-mentioned reflecting properties 6 to make the light from the emitted light of light source 4 incide above-mentioned light conductor 3, thereby can improve utilization ratio from the ejaculation light of light source 4 towards the back side of above-mentioned light source 4 direction.
Embodiment
Below, suitable examples of implementation of the present invention are described, but the present invention is not limited to these examples of implementation.
As shown in Figure 3, the planar light source device that constitutes by light source, light conductor and 2 prism plates of assembling and measure optical characteristics.As light source, use 4 LED (" day inferior chemistry " system NSCW215).The mylar made membrane that disposes the thickness 0.025mm that will apply silver-colored evaporation (thickness 1000 ) from the teeth outwards on the back side of light source makes the circular arc film of radius of curvature 1.5mm.As light conductor, use has the light conductor 1 of ejaculation characteristic shown in Figure 5 (it is 55 ° that peak value penetrates angle, and the half range value is 10 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.With light conductor and opposite side outgoing plane on dispose the reflecting plate of executing silver-colored evaporation (thickness 1000 ) on the one side at the mylar made membrane of thickness 0.05mm and forming.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 25 μ m, θ F
1Be 30 °, and θ B
1It is 30 °.On the other hand, the spacing of the prism of second prism plate is 25 μ m, θ F
1Be 5 °, and θ B
1It is 72 °.The manufacturing of these prism plates is undertaken by hot pressing.The plate of Merlon is assembled on the mould, and pressurizes with pressing mold from it.At this moment, the mould temperature is 160 ℃, and pressure is 90MPa, and be 8 seconds pressing time.That represent as Fig. 6 is the result that the briliancy of the planar light source device assembled is as above measured.In the mensuration of briliancy, used the three-dimensional light distribution device of " HIYIRAND " society system.In addition, light source is lit a lamp with driving current value 18mA.And, as a comparison, recorded and narrated the briliancy measurement result of comparative example shown below 1 simultaneously.Below, with embodiment more all be that comparative example 1 is carried out as benchmark.
Comparative example 1 is described.
As light conductor, use has the light conductor 4 of ejaculation characteristic shown in Figure 12 (it is 70 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.On the outgoing plane side of light conductor so that the spacing that prism facets disposes prism towards the mode of exit facet one side of light conductor be 30 μ m and have the prism plate 1 of prism that drift angle is 68 ° a isosceles triangle.
As light conductor, use has the light conductor 2 of ejaculation characteristic shown in Figure 7 (it is 55 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 25 μ m, θ F
1Be 30 °, and θ B
1It is 30 °.On the other hand, the spacing of the prism of second prism plate is 25 μ m, θ F
1Be 5 °, and θ B
1It is 72 °.What Fig. 8 represented is the briliancy measurement result of embodiment 2 and the briliancy measurement result of comparative example 1.
As light conductor, use has the light conductor 3 of ejaculation characteristic shown in Figure 9 (it is 65 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 25 μ m, θ F
1Be 30 °, and θ B
1It is 30 °.On the other hand, the spacing of the prism of second prism plate is 25 μ m, θ F
1Be 5 °, and θ B
1It is 60 °.What Figure 10 represented is the briliancy measurement result of embodiment 3 and the briliancy measurement result of comparative example 1.
As light conductor, use has the light conductor 3 of ejaculation characteristic shown in Figure 9 (it is 65 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 30 μ m, θ F
1Be 30 °, and θ B
1It is 30 °.On the other hand, the spacing of the prism of second prism plate is 30 μ m, θ F
1Be 5 °, and θ B
1It is 60 °.What Figure 11 represented is the briliancy measurement result of embodiment 4 and the briliancy measurement result of comparative example 1.
As light conductor, use has the light conductor 4 of ejaculation characteristic shown in Figure 12 (it is 70 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 30 μ m, θ F
1Be 30 °, and θ B
1It is 60 °.On the other hand, the spacing of the prism of second prism plate is 30 μ m, θ F
1Be 15 °, and θ B
1It is 35 °.What Figure 13 represented is the briliancy measurement result of embodiment 4 and the briliancy measurement result of comparative example 1.
Comparative example 2 is described.
As light conductor, use has the light conductor 4 of ejaculation characteristic shown in Figure 12 (it is 70 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor disposes first prism plate, and the outgoing plane side at first prism plate disposes second prism plate again.First prism plate, the second prism plate material are Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of first prism plate is 30 μ m, θ F
1Be 40 °, and θ B
1It is 45 °.On the other hand, the spacing of the prism of second prism plate is 30 μ m, θ F
1Be 20 °, and θ B
1It is 45 °.What Figure 14 represented is the briliancy measurement result of comparative example 2.
Comparative example 3 is described.
As light conductor, use has the light conductor 4 of ejaculation characteristic shown in Figure 12 (it is 70 ° that peak value penetrates angle, and the half range value is 20 °).In addition, be formed with holographic diffusion patterned (3 ° of diffusion angles) in the outgoing plane side.Outgoing plane side at light conductor only disposes first prism plate.The material of prism plate is Merlon (refractive index 1.58), and thickness is 150 μ m.The spacing of the prism of prism plate is 30 μ m, θ F
1Be 34 °, and θ B
1It is 20 °.The briliancy measurement result of comparative example 3 also as shown in figure 14.
The specification and the briliancy measurement result of above embodiment and the planar light source device in the comparative example are gathered, as shown in table 1.
Table 1
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| The light conductor peak value | 55° | 55° | 65° | 65° | 70° | 70° | 70° | 70° | |
| Light conductor half range value | 10° | 20° | 20° | 20° | 20° | 20° | 20° | 20° | |
| First prism | Spacing | 25μm | 25μm | 25μm | 30μm | 30μm | 30μm | 30μm | 30μm |
| θF 1 | 30° | 30° | 30° | 300 | 30° | The thick angle of prism down is 68 ° a isosceles triangle | 40° | 34° | |
| θB 1 | 30° | 30° | 30° | 30° | 60° | 45° | 20° | ||
| Refractive index | 1.58 | 1.58 | 1.58 | 1.58 | 1.58 | 1.58 | 1.59 | ||
| Second prism | Spacing | 25μm | 25μm | 25μm | 30μm | 30μm | 30μm | - | |
| θF 2 | 5° | 5° | 5° | 5° | 16° | 20° | - | ||
| θB 2 | 72° | 72° | 60° | 60° | 35° | 45° | - | ||
| Refractive index | 1.58 | 1.58 | 1.58 | 1.58 | 1.58 | 1.58 | - | ||
| Peak value briliancy (cd/m 2) ratio of example 1 relatively | 10200 104％ | 10250 104％ | 10350 105％ | 10500 107％ | 10672 109％ | 9823 100％ | 9750 99％ | 9370 95％ | |
| Peak value penetrates angle | 0° | 0° | 1° | 1° | 1° | -30 | 1° | 0° | |
| Positive briliancy (cd/m 2) ratio of example 1 relatively | 10200 111％ | 10250 111％ | 9900 108％ | 10100 110％ | 9994 109％ | 9209 100％ | 9200 100％ | 9370 102％ | |
| The half range value | 7° | 10° | 10° | 10° | 11° | 10° | 11° | 12° | |
| φ 2 | 31.2 | 31.2 | 35.0 | 35.0 | 36.5 | - | 36.5 | 38.2 |
| 90-φ 2-φ c1 | 22.5 | 22.5 | 18.7 | 18.7 | 17.2 | - | 17．2 | 17.7 |
| (1)θF 1≤φ 2 | 1.2 | 1.2 | 5.0 | 5.0 | 6.5 | - | -3.5 | 2.2 |
| (2)90-φ 2-φ c1≤B 1 | 7.5 | 7.5 | 11.3 | 11.3 | 42.8 | - | 27.8 | - |
| φ 6 | 6.6 | 6.6 | 11.3 | 11.3 | 24.2 | - | 18.5 | - |
| 90-φ 5-φ c2 | 47.1 | 47.1 | 42.4 | 42.4 | 29.6 | - | 35.2 | - |
| (3)θF 2≤φ 6 | 1.6 | 1.6 | 6.3 | 6.3 | 9.2 | - | -1.5 | - |
| (4)90-φ 6-φ c2≤θ8 2 | 24.9 | 24.9 | 17.6 | 17.6 | 5.4 | - | 9.8 | - |
At least 2 prism plates of planar light source device utilization of the present invention will change direction through the light that light conductor penetrates while the loss that suppresses light from light source interimly, and penetrate to the frontal of planar light source device, so the high planar light source device of briliancy that can provide a kind of and existing planar light source device to compare frontal.
Planar light source device of the present invention has to a certain degree expansion by making ejaculation angular distribution from the ejaculation light of light conductor, can guarantee to can be used for to improve the ratio of light of the briliancy of frontal, and because the prism plate shape that makes at least 2 satisfies the decision condition of given shape, so suppress the loss of light on one side, can and change direction ground on one side penetrates to the frontal of planar light source device interimly, as a result, the briliancy height and the good planar light source device of optically focused that can provide a kind of and existing planar light source device to compare frontal.
Planar light source device of the present invention arrives hypotenuse 11a easily by making ejaculation light from light conductor by refraction in first prism plate, and the prism shape of at least 2 prism plates satisfies the decision condition of the shape of scheme 1 described prism, thus the briliancy height and the good planar light source device of optically focused that can provide a kind of and existing planar light source device to compare frontal.
Planar light source device of the present invention is owing to be difficult to produce the beam split that causes because of diffraction, so satisfy the decision condition of the shape of scheme 1 described prism at least by the prism shape that makes 2 prism plates, thereby face suppresses the loss of light on one side, on one side change direction interimly and penetrate, therefore the high planar light source device of briliancy that can provide a kind of and existing planar light source device to compare frontal to the frontal of planar light source device.
Claims (16)
1. planar light source device, possess light source, with at least one side as the plane of incidence and have light conductor and prism plate with the outgoing plane of above-mentioned plane of incidence approximate vertical, it is characterized in that,
The face of the opposite side of the face with being formed with prism of above-mentioned prism plate is configured to the outgoing plane almost parallel with above-mentioned light conductor, and above-mentioned prism is configured to the plane of incidence almost parallel with above-mentioned light conductor,
In the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of above-mentioned prism plate, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
1Satisfy formula (1), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
1Satisfy formula (2),
θF
1≤φ
2...(1)
(in formula (1), φ
2=sin
-1(n
1 -1Sin φ
1), here, n
1Be the refractive index of the material of the prism that forms above-mentioned prism plate, φ
1Expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor and above-mentioned light conductor.)
90-φ
2-φ
c1≤θB
1...(2)
(in formula (2), φ c
1=sin
-1(n
1 -1) expression above-mentioned prism plate critical angle.)。
2. planar light source device according to claim 1 is characterized in that, above-mentioned angle θ F
1Satisfy formula (1a), above-mentioned angle θ B
1Satisfy formula (2a),
θF
1≤φ
2-δ
1...(1a)
(in formula (1a), δ
1Expression is from half value of the half range value of the ejaculation light of above-mentioned light conductor)
90°-φ
2-φ
c1+δ
2≤θB
1...(2a)
(in formula (2a), δ
2Expression from the peak light of the ejaculation light of above-mentioned light conductor with the normal angulation φ of the outgoing plane of above-mentioned light conductor
1Incide above-mentioned prism plate, similarly from the peak light of the ejaculation light of the normal angulation of above-mentioned light conductor outgoing plane with the normal angulation φ of above-mentioned light conductor outgoing plane
2The value of half of the half range value of the light after refraction on the above-mentioned prism plate.)。
3. planar light source device according to claim 1 is characterized in that, above-mentioned angle θ F
1Satisfy formula (1b), above-mentioned angle θ B
1Satisfy formula (2b),
θF
1≤φ
2-δ
1×2...(1b)
90°-φ
2-φ
c1+δ
2×2≤θB
1...(2b)。
4. according to each described planar light source device of claim 1～3, it is characterized in that in above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is below 30 °.
5. according to each described planar light source device of claim 1～3, it is characterized in that in above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is more than 15 ° below 30 °.
6. according to each described planar light source device of claim 1～3, it is characterized in that in above-mentioned section, the distribution of the ejaculation light of above-mentioned light conductor is that the ejaculation angle of peak value is more than 60 °.
7. according to each described planar light source device of claim 1～3, it is characterized in that the spacing of prism is more than the 30 μ m.
8. a prism plate is the prism plate that is used in according in each described planar light source device of claim 1～7.
9. planar light source device, possess light source, with at least one side as the plane of incidence and have light conductor and at least 2 prism plates with the outgoing plane of above-mentioned plane of incidence approximate vertical, it is characterized in that,
The face that is formed with prism of above-mentioned prism plate is configured at equidirectional, and the face of the opposite side of the face with being formed with prism of above-mentioned prism plate is configured to outgoing plane almost parallel with above-mentioned light conductor, and above-mentioned prism is configured to the plane of incidence almost parallel with above-mentioned light conductor
In the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of first prism plate of and configuration relative with the outgoing plane of above-mentioned light conductor, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
1Satisfy formula (1), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
1Satisfy formula (2), in the section of both sides' approximate vertical of prism and the plane of incidence above-mentioned light conductor and the outgoing plane of i the prism plate (i is the integer more than 2) of the ejaculation light side that is disposed at above-mentioned first prism plate, the hypotenuse angulation θ F of the normal of the outgoing plane of above-mentioned light conductor and light source side
iSatisfy formula (3), the hypotenuse angulation θ B of the normal of the outgoing plane of above-mentioned light conductor and an opposite side with light source
iSatisfy formula (4),
θF
1≤φ
2...(1)
(in formula (1), φ
2=sin
-1(n
1 -1Sin φ
1), here, n
1Be the refractive index of the material of the prism that forms first prism plate, φ
1=sin
-1(n
1 -1) expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of above-mentioned light conductor and above-mentioned light conductor.)
90°-φ
2-φ
c1≤θB
1...(2)
(in formula (2), φ
C1Represent the critical angle of first prism plate.)
θF
i≤φ
6...(3)
(in formula (3), φ
6=sin
-1(n
i -1Sin φ
5), here, n
iBe the refractive index of the material of the prism that forms i prism plate, φ
5Expression is from the normal angulation of the outgoing plane of the peak light of the ejaculation light of i-1 prism plate and above-mentioned light conductor.)
90°-φ
6-φ
ci≤θB
i...(4)
(in formula (4), φ
Ci=sin
-1(n
i -1) expression i prism plate critical angle.)。
10. planar light source device according to claim 9 is characterized in that, above-mentioned angle θ F
1, θ B
1, θ F
i, θ B
iSatisfy following formula (1a), formula (2a), formula (3a) and formula (4a),
θF
1≤φ
2-δ
1...(1a)
(in formula (1a), δ
1Expression is from half value of the half range value of the ejaculation light of above-mentioned light conductor.)
90°-φ
2-φ
c1+δ
2≤θB
1...(2a)
(in formula (2a), δ
2Expression from the peak light of the ejaculation light of above-mentioned light conductor with the normal angulation φ of the outgoing plane of above-mentioned light conductor
1Incide on the above-mentioned prism plate, similarly from the peak light of the ejaculation light of the normal angulation of the outgoing plane of above-mentioned light conductor with the normal angulation φ of above-mentioned light conductor outgoing plane
2The value of half of the half range value of the light after refraction on the above-mentioned prism plate.)
θF
i≤φ
6-δ
3...(3a)
(in formula (3a), δ
3Expression is from half value of the half range value of the ejaculation light of i-1 prism plate.)
90°-φ
6-φ
ci+δ
4≤θB
i...(4a)
(in formula (4a), δ
4Expression from the peak light of the ejaculation light of i-1 prism plate with the normal angulation φ of the outgoing plane of above-mentioned light conductor
5Incide on i the prism plate, similarly with the normal angulation φ of above-mentioned light conductor outgoing plane
6The value of half of the half range value of the light after the refraction.)。
11. planar light source device according to claim 9 is characterized in that, above-mentioned angle θ F
1, θ B
1, θ F
i, θ B
iSatisfy following formula (1b), formula (2b), formula (3b) and formula (4b),
θF
1≤φ
2-δ
1×2...(1b)
90°-φ
2-φ
c1+δ
2×2≤θB
1...(2b)
θF
i≤φ
6-δ
3×2...(3b)
90°-φ
6-φ
ci+δ
4×2≤θB
i...(4b)。
12., it is characterized in that in above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is below 30 ° according to each described planar light source device of claim 9～11.
13., it is characterized in that in above-mentioned section, the photodistributed half range value of the ejaculation of above-mentioned light conductor is more than 15 ° below 30 ° according to each described planar light source device of claim 9～11.
14., it is characterized in that in above-mentioned section, the distribution of the ejaculation light of above-mentioned light conductor is that the ejaculation angle of peak value is more than 60 ° according to each described planar light source device of claim 9～11.
15., it is characterized in that the spacing of prism is more than the 30 μ m according to each described planar light source device of claim 9～11.
16. a prism plate is above-mentioned i the prism plate that is used in according in each described planar light source device of claim 9～15.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP225324/2005 | 2005-08-03 | ||
| JP2005225324 | 2005-08-03 | ||
| JP363197/2005 | 2005-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101233363A true CN101233363A (en) | 2008-07-30 |
Family
ID=39898968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800282590A Pending CN101233363A (en) | 2005-08-03 | 2006-05-15 | Surface light source device and prism sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101233363A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235640A (en) * | 2010-04-26 | 2011-11-09 | 颖台科技股份有限公司 | Multilayer light guide device |
| CN107610590A (en) * | 2017-09-25 | 2018-01-19 | 深圳市华星光电技术有限公司 | Multifunction advertising display screen |
| CN114019601A (en) * | 2022-01-06 | 2022-02-08 | 扬昕科技(苏州)有限公司 | Light collecting type light guide assembly and backlight module thereof |
-
2006
- 2006-05-15 CN CNA2006800282590A patent/CN101233363A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235640A (en) * | 2010-04-26 | 2011-11-09 | 颖台科技股份有限公司 | Multilayer light guide device |
| CN102235640B (en) * | 2010-04-26 | 2013-06-19 | 颖台科技股份有限公司 | Multilayer light guide device |
| CN107610590A (en) * | 2017-09-25 | 2018-01-19 | 深圳市华星光电技术有限公司 | Multifunction advertising display screen |
| CN114019601A (en) * | 2022-01-06 | 2022-02-08 | 扬昕科技(苏州)有限公司 | Light collecting type light guide assembly and backlight module thereof |
| CN114019601B (en) * | 2022-01-06 | 2022-04-05 | 扬昕科技(苏州)有限公司 | Light collecting type light guide assembly and backlight module thereof |
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