CN101604046A - Light-guide device and backlight module - Google Patents
Light-guide device and backlight module Download PDFInfo
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- CN101604046A CN101604046A CNA2008101254300A CN200810125430A CN101604046A CN 101604046 A CN101604046 A CN 101604046A CN A2008101254300 A CNA2008101254300 A CN A2008101254300A CN 200810125430 A CN200810125430 A CN 200810125430A CN 101604046 A CN101604046 A CN 101604046A
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Abstract
A kind of light-guide device comprises a light guide body and at least one optical microstructures.Light guide body has a first surface, a second surface and connects an incidence surface of first surface and second surface.Optical microstructures protrudes in second surface, and has one the 3rd surface, one the 4th surface and one the 5th surface.The 4th surface and the 3rd surface are positioned at the same side of second surface.The angle of one the 3rd normal vector on the 3rd surface and one the 4th normal vector on the 4th surface drops on from 90 degree to the scope of 100 degree.The 5th surface and the 3rd surface are positioned at the same side of second surface, and the 4th surface is between the 3rd surface and the 5th surface.The angle of one the 5th normal vector on the 5th surface and one first normal vector of first surface drops on from 120 degree to the scope of 135 degree.A kind of backlight module of this light-guide device that adopts also is suggested.
Description
Technical field
The present invention relates to a kind of light source module and optical element thereof, and particularly relate to a kind of backlight module (backlight module) and light-guide device (light guide device) thereof.
Background technology
Along with modern video signal development of technology, LCD has been used in mobile phone (mobilephone), mobile computer (notebook computer), personal computer in large quantities, and (personal computer is PC) and on the display screen of personal digital assistant consumption electronic products such as (personal digital assistant).Yet, because the display panels (LCD panel) of LCD itself does not have lighting function, therefore need below display panels, dispose backlight module providing display panels needed light source, and then make display panels reach the effect of demonstration.
A kind of known side incident type backlight module comprises that a light guide plate, is disposed at the reflector plate that the other cathode fluorescent tube and of light guide plate is disposed at the light guide plate below.The light beam that cathode fluorescent tube sent can be entered by the incidence surface of light guide plate in the light guide plate, and the sheet that is reflected then reflexes to the exiting surface of light guide plate, and is passed to outside the light guide plate by exiting surface.Thus, light guide plate and reflector plate just can be converted to the line source that cathode fluorescent tube provided the area source by the exiting surface outgoing.Because display panels has higher requirement for the homogeneity and the brightness of area source, therefore develop and the optical microstructures that many kinds are positioned at the surface of light guide plate, to promote the homogeneity and the brightness of the area source that backlight module was provided.
Summary of the invention
The invention provides a kind of light-guide device, its light beam of guiding out is comparatively concentrated.
The invention provides a kind of backlight module, it can provide the light source of comparatively concentrating.
One embodiment of the invention propose a kind of light-guide device, and it comprises a light guide body and at least one optical microstructures.Light guide body has a first surface, with respect to second surface of this first surface and the incidence surface that connects first surface and second surface.Optical microstructures protrudes in second surface, and has one the 3rd surface, one the 4th surface and one the 5th surface.The 4th surface and the 3rd surface are positioned at the same side of second surface.One the 3rd normal vector (normal vector) on the 3rd surface drops on from 90 degree to the scope of 100 degree with the angle of one the 4th normal vector on the 4th surface.The 5th surface and the 3rd surface are positioned at the same side of second surface, and the 4th surface is between the 3rd surface and the 5th surface.The angle of one the 5th normal vector on the 5th surface and one first normal vector of first surface drops on from 120 degree to the scope of 135 degree.
One embodiment of the invention also propose a kind of backlight module, and it comprises at least one light-emitting component and above-mentioned light-guide device.Light-emitting component is suitable for sending a light beam, and light beam can enter the light-guide device from incidence surface.From the segment beam at least of incidence surface can be in regular turn via the 3rd surface be passed to light-guide device outer, enter in the light-guide device via the 4th surface,, and be passed to outside the light-guide device to first surface by the 5th surface reflection via first surface.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Figure 1A is the schematic perspective view of the backlight module of one embodiment of the invention;
Figure 1B is the diagrammatic cross-section of the backlight module of Figure 1A along the A-A line;
Fig. 2 is the schematic perspective view of light-guide device of the backlight module of another embodiment of the present invention;
Fig. 3 is the diagrammatic cross-section of light-guide device of the backlight module of further embodiment of this invention;
Fig. 4 is the diagrammatic cross-section of light-guide device of the backlight module of yet another embodiment of the invention.
[main element symbol description]
100: backlight module
110: light-emitting component
112: light beam
120,120a, 120b, 120c: light-guide device
122: light guide body
124,124a, 124b, 124c: optical microstructures
130: reflector element
C1, C1 ': first joint face
C2, C2 ': second joint face
D1: first direction
D2: second direction
I: incidence surface
N1: first normal vector
N3: the 3rd normal vector
N4: the 4th normal vector
N5: the 5th normal vector
NI: normal vector
S1: first surface
S2: second surface
S3, S3 ': the 3rd surface
S4, S4 ': the 4th surface
S5, S5 ': the 5th surface
S6, S6 ': the 6th surface
θ
13, θ
14, θ
15, θ
34: angle
θ
e: emergence angle
Embodiment
The explanation of following each embodiment is with reference to the accompanying drawings, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to the accompanying drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
In this manual, the normal vector on a surface of an object is defined as from this interior of articles and points to this object outside, and with the vector of this Surface Vertical.
Figure 1A is the schematic perspective view of the backlight module of one embodiment of the invention, and Figure 1B is the diagrammatic cross-section of the backlight module of Figure 1A along the A-A line.With reference to Figure 1A and Figure 1B, the backlight module 100 of present embodiment comprises a light-emitting component 110 and a light-guide device 120.Light-emitting component 110 is suitable for sending a light beam 112 (shown in Figure 1B).In the present embodiment, light-emitting component 110 for example be a cathode fluorescent tube (cold cathode fluorescent lamp, CCFL).Yet, in other embodiments, light-emitting component also light emitting diode (light-emitting diode, LED) or other suitable light-emitting component.Light-guide device 120 comprises a light guide body 122 and a plurality of optical microstructures 124.In the present embodiment, the material of light-guide device 120 for example is that (polymethylmethacrylate, PMMA), its refractive index for example is about 1.49 to polymethylmethacrylate.Yet in other embodiments, the material of light-guide device can also be other acryl plastics (acrylic plastic), other plastics, glass or other light-transmitting materials.The incidence surface I that light guide body 122 has a first surface S1, a second surface S2 and connects first surface S1 and second surface S2.In the present embodiment, first surface S1 is with respect to second surface S2, and light-guide device 120 is a light guide plate.
The light beam 112 that light-emitting component 110 is sent can enter the light-guide device 120 from incidence surface I.Segment beam at least 112 from incidence surface I can be passed to outside the light-guide device 120 via the 3rd surperficial S3 in regular turn, enter in the light-guide device 120 via the 4th surperficial S4, reflexed to first surface S1 by the 5th surperficial S5, and be passed to outside the light-guide device 120 via first surface S1.In the present embodiment, because angle theta
34Be to drop on from 90 degree to the scope of 100 degree, and angle theta
15Be to drop on from 120 degree to the scopes of 135 degree, therefore most light beam 112 can be with incident angle incident the 5th surperficial S5 greater than critical angle, and thereby by the 5th surperficial S5 total reflection to first surface S1.In addition, because angle theta
34With angle theta
15Be to drop in the above-mentioned scope, therefore most light beam 112 is when being passed to outside the light-guide device 120 via first surface S1, and it is from the emergence angle θ of first surface S1 outgoing
eCan drop in the following scope of 20 degree.So the light-guide device 120 of present embodiment just can be guided out comparatively integrated light beam 112, and then make the backlight module 100 of present embodiment that the light source of comparatively concentrating can be provided.Thus, the liquid crystal indicator (not illustrating) of application backlight module 100 just can provide the display frame of higher brightness.
In addition, in the present embodiment, because emergence angle θ
eBe to drop in the following scope of 20 degree, so backlight module 100 prismatic lens of can not need arranging in pairs or groups uses, comparatively concentrated light source just can be provided.Because backlight module 100 is compared known backlight module and lacked a slice prismatic lens, so the weight of backlight module 100 is light, the assembling processing procedure is simpler and easy and cost is lower.Moreover because all there is integrated light beam 112 each optical microstructures 124 top from first surface S1 outgoing, so light-guide device 120 can derive light beam 112 equably from first surface S1, and can not produce the concealed wire district in the subregion of first surface S1.In addition, the also visual demand of the density of the optical microstructures 124 on the second surface S2 and adjusting for example can make certain regional density higher, and another regional density is lower, so just can control the uniformity coefficient by the light beam 112 of first surface S1 outgoing.
In the present embodiment, the 3rd normal vector N3, the 4th normal vector N4 and the 5th normal vector N5 copline in fact.In addition, in the present embodiment, the 3rd normal vector N3, the 4th normal vector N4, the 5th normal vector N5 and the first normal vector N1 be copline in fact.In addition, in the present embodiment, the normal vector NI of the 3rd normal vector N3, the 4th normal vector N4, the 5th normal vector N5 and incidence surface I is copline in fact.Thus, from the light beam 112 of incidence surface I more ratios can be arranged just is to be passed to outside the light-guide device 120 via the 3rd surperficial S3, the 4th surperficial S4, the 5th surperficial S5 and first surface S1 in regular turn, and can make the light beam 112 by first surface S1 outgoing have more ratio to have the following emergence angle θ of 20 degree
e
In the present embodiment, the angle theta of the first normal vector N1 and the 3rd normal vector N3
13Drop on from 130 degree to the scope of 135 degree.In addition, the angle theta of the first normal vector N1 and the 4th normal vector N4
14Can drop on from 130 degree to the scope of 135 degree.In other words, in the present embodiment, the 3rd surperficial S3 and the 4th surperficial S4 can be symmetrical mutually.In addition, in the present embodiment, the 3rd surperficial S3 and the 4th surperficial S4 can be connected to each other.
In the present embodiment, optical microstructures 124 has more one the 6th surperficial S6, and itself and the 3rd surperficial S3 are positioned at the same side of second surface S2, and the 3rd surperficial S3 is between the 6th surperficial S6 and the 4th surperficial S4.In the present embodiment, optical microstructures 124 can have more one first joint face C1, and it connects the 6th surperficial S6 and the 3rd surperficial S3, and the first joint face C1 for example is a plane.In addition, optical microstructures 124 can have more one second joint face C2, and it connects the 4th surperficial S4 and the 5th surperficial S5, and the second joint face C2 for example is a plane.The angle of the first joint face C1 and the 6th surperficial S6 and the 3rd surperficial S3 can be all the obtuse angle, and the angle of the second joint face C2 and the 4th surperficial S4 and the 5th surperficial S5 also can be all the obtuse angle, so can make optical microstructures 124 be easy to make, and when assembling, be difficult for other element of scratch with ejection formation.In addition, in the present embodiment, light guide body 122 can be formed in one with optical microstructures 124.For example, light guide body 122 can be made via ejection formation by same group of mould with optical microstructures 124.
In the present embodiment, backlight module 100 can also comprise a reflector element 130, and it is disposed at the side of second surface S2, and wherein optical microstructures 124 is between second surface S2 and reflector element 130.Reflector element 130 for example is a reflector plate or reflecting plate, and it can reflect the light beam 122 that is not passed to the other parts of first surface S1 via above-mentioned light path, and then promotes the brightness of the light source that backlight module 100 provided.
In the present embodiment, optical microstructures 124 can be strip, and each optical microstructures 124 extends along a first direction D1 parallel with incidence surface I, and these optical microstructures 124 are arranged along a second direction D2 vertical with incidence surface I.
It should be noted that the quantity that the present invention does not limit the light-emitting component 110 that backlight module 100 had only is one.In other embodiments, backlight module can also have a plurality of other light-emitting components of incidence surface that are disposed at.For example, incidence surface is other configurable a light-emitting section (light bar), and light-emitting section has a plurality of light emitting diodes of arranging along first direction D1.In addition, the present invention's light guide body 122 of not limiting light-guide device 120 only has an incidence surface I.In other embodiments, light guide body can also have the incidence surface of a plurality of connection first surfaces and second surface, and each incidence surface side disposes at least one light-emitting component.For example, in one embodiment, light guide body can have two relative incidence surfaces, and optical microstructures then is symmetrical, that is the angle of the normal vector on its 6th surface and first normal vector equals angle theta in fact
15
Fig. 2 is the schematic perspective view of light-guide device of the backlight module of another embodiment of the present invention.With reference to Fig. 2, the light-guide device 120a of the backlight module of present embodiment and above-mentioned light-guide device 120 (please refer to Figure 1A) are similar, and both difference is as described below.In the light-guide device 120a of present embodiment, it is block that optical microstructures 124a is.In addition, these optical microstructures 124a also arranges along first direction D1 except arranging along second direction D2.
It should be noted that the present invention does not limit optical microstructures 124a and arranges along first direction D1 and second direction D2, in other embodiments, optical microstructures can also be to arrange along other direction of relative first direction D1 or second direction D2 inclination.Perhaps, optical microstructures can be Else Rule or be irregular alignment.Perhaps, optical microstructures can be looked actual demand and arrange in various mode, so that can meet demand by the uniformity coefficient of the light beam of first surface S1 outgoing.
Fig. 3 is the diagrammatic cross-section of light-guide device of the backlight module of further embodiment of this invention.With reference to Fig. 3, the light-guide device 120b of the backlight module of present embodiment and above-mentioned light-guide device 120 (illustrating as Figure 1B) are similar, and both difference is as described below.In the light-guide device 120b of present embodiment, the first joint face C1 ' of optical microstructures 124b and the first joint face C2 ' respectively are a curved surface, for example be one toward curved surface away from the direction projection of light guide body 122, so can make light-guide device 120b be easy to make, and when assembling, be difficult for other element of scratch with ejection formation.
Fig. 4 is the diagrammatic cross-section of light-guide device of the backlight module of yet another embodiment of the invention.With reference to Fig. 4, the light-guide device 120c of the backlight module of present embodiment and above-mentioned light-guide device 120 (illustrating as Figure 1B) are similar, and both difference is as described below.In the present embodiment, the optical microstructures 124c of light-guide device 120c does not have the first joint face C1 and the second joint face C2 (illustrating as Figure 1B), the substitute is, the 6th surperficial S6 ' and the 3rd surperficial S3 ' are connected to each other, and the 4th surperficial S4 ' is connected to each other with the 5th surperficial S5 '.
In sum, in the light-guide device of one embodiment of the invention, because the 3rd normal vector and the 4th normal vector angle are to drop on from 90 degree to the scope of 100 degree, and the angle of first normal vector and the 5th normal vector is to drop on from 120 degree to the scope of 135 degree, therefore most of light beam from incidence surface can be with incident angle incident the 5th surface greater than critical angle, and thereby by the 5th surperficial total reflection to first surface.In addition, most light beam is when being passed to outside the light-guide device via first surface, its emergence angle from the first surface outgoing can drop on 20 the degree below scope in, so light-guide device can be guided out comparatively integrated light beam, and then make the backlight module of one embodiment of the invention that the light source of comparatively concentrating can be provided.Thus, the liquid crystal indicator of using this backlight module just can provide the display frame of higher brightness.
In addition because above-mentioned emergence angle is to drop in the following scope of 20 degree, so the backlight module of one embodiment of the invention can otherwise need the collocation prismatic lens to use, comparatively concentrated light source just can be provided.Because this backlight module is compared known backlight module and lacked a slice prismatic lens, so the weight of this backlight module is light, the assembling processing procedure is simpler and easy and cost is lower.Moreover because all there is integrated light beam each optical microstructures top from the first surface outgoing, so the light-guide device of one embodiment of the invention can derive light beam equably from first surface, and can not produce the concealed wire district in the subregion of first surface.In addition, the also visual demand of the density of the optical microstructures on the second surface and adjusting so just can be controlled the uniformity coefficient by the light beam of first surface outgoing.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (20)
1, a kind of light-guide device comprises:
One light guide body has a first surface, with respect to a second surface of this first surface and an incidence surface that connects this first surface and this second surface; And
At least one optical microstructures protrudes in this second surface, and has:
One the 3rd surface;
One the 4th surface is positioned at the same side of this second surface with the 3rd surface, and wherein the angle of one the 4th normal vector on one the 3rd normal vector on the 3rd surface and the 4th surface drops on from 90 degree to the scopes of 100 degree; And
One the 5th surface, be positioned at the same side of this second surface with the 3rd surface, wherein the 4th surface is between the 3rd surface and the 5th surface, and the angle of one the 5th normal vector on the 5th surface and one first normal vector of this first surface drops on from 120 degree to the scope of 135 degree.
2, light-guide device as claimed in claim 1, wherein the refractive index of this light-guide device equals 1.49 in fact.
3, light-guide device as claimed in claim 1, wherein the 3rd normal vector, the 4th normal vector, the 5th normal vector and this first normal vector copline in fact.
4, light-guide device as claimed in claim 1, wherein a normal vector of the 3rd normal vector, the 4th normal vector, the 5th normal vector and this incidence surface copline in fact.
5, light-guide device as claimed in claim 1, wherein the angle of this first normal vector and the 3rd normal vector drops on from 130 degree to the scope of 135 degree.
6, light-guide device as claimed in claim 1, wherein the angle of this first normal vector and the 4th normal vector drops on from 130 degree to the scope of 135 degree.
7, light-guide device as claimed in claim 1, wherein this optical microstructures also has one the 6th surface, is positioned at the same side of this second surface with the 3rd surface, and the 3rd surface is between the 6th surface and the 4th surface.
8, light-guide device as claimed in claim 7, wherein this optical microstructures also has one first joint face, connect the 6th surface and the 3rd surface, and this first joint face is a plane or a curved surface.
9, light-guide device as claimed in claim 1, wherein this optical microstructures also has one second joint face, connect the 4th surface and the 5th surface, and this second joint face is a plane or a curved surface.
10, a kind of backlight module comprises:
At least one light-emitting component is suitable for sending a light beam; And
One light-guide device comprises:
One light guide body has a first surface, with respect to a second surface of this first surface and an incidence surface that connects this first surface and this second surface, and wherein this light beam can enter this light-guide device from this incidence surface; And
At least one optical microstructures protrudes in this second surface, and has:
One the 3rd surface;
One the 4th surface is positioned at the same side of this second surface with the 3rd surface, and wherein the angle of one the 4th normal vector on one the 3rd normal vector on the 3rd surface and the 4th surface drops on from 90 degree to the scopes of 100 degree; And
One the 5th surface, be positioned at the same side of this second surface with the 3rd surface, wherein the 4th surface is between the 3rd surface and the 5th surface, and the angle of one the 5th normal vector on the 5th surface and one first normal vector of this first surface drops on from 120 degree to the scope of 135 degree
Wherein, from can being passed to outside this light-guide device via the 3rd surface in regular turn to this light beam of small part of this incidence surface, enter in this light-guide device via the 4th surface, to this first surface, and be passed to outside this light-guide device via this first surface by the 5th surface reflection.
11, backlight module as claimed in claim 10, wherein the refractive index of this light-guide device equals 1.49 in fact.
12, backlight module as claimed in claim 10, wherein the 3rd normal vector, the 4th normal vector, the 5th normal vector and this first normal vector copline in fact.
13, backlight module as claimed in claim 10, wherein a normal vector of the 3rd normal vector, the 4th normal vector, the 5th normal vector and this incidence surface copline in fact.
14, backlight module as claimed in claim 10, wherein the angle of this first normal vector and the 3rd normal vector drops on from 130 degree to the scope of 135 degree.
15, backlight module as claimed in claim 10, wherein the angle of this first normal vector and the 4th normal vector drops on from 130 degree to the scope of 135 degree.
16, backlight module as claimed in claim 10, wherein this optical microstructures also has one the 6th surface, is positioned at the same side of this second surface with the 3rd surface, and the 3rd surface is between the 6th surface and the 4th surface.
17, backlight module as claimed in claim 16, wherein this optical microstructures also has one first joint face, connect the 6th surface and the 3rd surface, and this first joint face is a plane or a curved surface.
18, backlight module as claimed in claim 10, wherein this optical microstructures also has one second joint face, connect the 4th surface and the 5th surface, and this second joint face is a plane or a curved surface.
19, backlight module as claimed in claim 10, wherein from this incidence surface should be to this light beam of small part by the 5th surperficial total reflection to this first surface.
20, backlight module as claimed in claim 10 also comprises a reflector element, is disposed at a side of this second surface, and wherein this optical microstructures is between this second surface and this reflector element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101254300A CN101604046A (en) | 2008-06-13 | 2008-06-13 | Light-guide device and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101254300A CN101604046A (en) | 2008-06-13 | 2008-06-13 | Light-guide device and backlight module |
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| Publication Number | Publication Date |
|---|---|
| CN101604046A true CN101604046A (en) | 2009-12-16 |
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ID=41469845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101254300A Pending CN101604046A (en) | 2008-06-13 | 2008-06-13 | Light-guide device and backlight module |
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| Country | Link |
|---|---|
| CN (1) | CN101604046A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280814A (en) * | 2013-07-10 | 2015-01-14 | 财团法人工业技术研究院 | Light guide plate and light guide device with same |
| CN113655558A (en) * | 2021-09-02 | 2021-11-16 | 扬昕科技(苏州)有限公司 | Light guide plate and backlight module |
-
2008
- 2008-06-13 CN CNA2008101254300A patent/CN101604046A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280814A (en) * | 2013-07-10 | 2015-01-14 | 财团法人工业技术研究院 | Light guide plate and light guide device with same |
| CN104280814B (en) * | 2013-07-10 | 2017-04-12 | 财团法人工业技术研究院 | Light guide plate and light guide device with same |
| CN113655558A (en) * | 2021-09-02 | 2021-11-16 | 扬昕科技(苏州)有限公司 | Light guide plate and backlight module |
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Open date: 20091216 |