CN103900033A - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
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- CN103900033A CN103900033A CN201310629026.8A CN201310629026A CN103900033A CN 103900033 A CN103900033 A CN 103900033A CN 201310629026 A CN201310629026 A CN 201310629026A CN 103900033 A CN103900033 A CN 103900033A
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- 238000005286 illumination Methods 0.000 description 9
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 5
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Abstract
A light guide plate and a backlight module are provided, the backlight module comprises a light source device and a light guide plate. The light source device comprises a plurality of point light sources arranged along an extending direction, wherein each point light source is used for providing a light beam. The light guide plate comprises a rectangular main body part and two triangular protruding parts, wherein the main body part is provided with a first light incident surface, a light emergent surface and a bottom surface opposite to the light emergent surface, the first light incident surface is adjacent to the bottom surface and the light emergent surface, the first light incident surface is rectangular and extends along the extending direction, and each protruding part respectively protrudes from one of two short sides of the first light incident surface along the extending direction. Each protruding portion has a second light incident surface and a reflective side surface, and the second light incident surface is adjacent to the first light incident surface and parallel to the first light incident surface. The light guide plate and the backlight module can provide a surface light source with higher uniformity.
Description
Technical field
The present invention is about a kind of optical module, and particularly about a kind of LGP and backlight module thereof.
Background technology
Along with the progress of Display Technique, flat-panel screens has become the main flow of display, and has replaced the status of conventional cathode ray tube (cathode ray tube, CRT).In flat-panel screens, be subject to being widely used of consumer most with liquid crystal display (liquid crystal display, LCD) again.General liquid crystal display mainly can be made up of backlight module and liquid crystal panel.Because liquid crystal panel itself can be not luminous, therefore need backlight module to provide and show required area source.
Generally speaking, known backlight module can be divided into direct type backlight module and side light-entering type backlight module.Taking side light-entering type backlight module as example, be generally the light that the luminescence component that utilizes LGP (light guide plate) guiding to be disposed at LGP one side sends, provide liquid crystal panel required area source.Wherein, can be divided into again light emitting diode (light emitting diode, LED) backlight module and cathode fluorescent tube backlight module according to the type of adopted luminescence component.
In the side light-entering type backlight module that adopts light emitting diode as luminescence component, the incidence surface of LGP is other can arrange multiple light emitting diodes.Because light emitting diode has specific rising angle scope, therefore LGP is in forming clear zone near light emitting diode and the region dropped within the scope of rising angle, and can form dark space in the extraneous region of rising angle.The area source that these clear zones and dark space can cause LGP to provide is inhomogeneous, i.e. so-called focus (hot spot) phenomenon.Therefore, the dark space that hot spot phenomenon produces and clear zone, will make the overall uniformity of the area source that backlight module provides decline, and make the overall optical qualities of liquid crystal display be difficult to promote.Although seeing through increases the quantity of light emitting diode and can reduce hot spot phenomenon, but, increase light emitting diode quantity and not only can cause cost to improve, also can improve its bulk temperature and service life of having reduced light emitting diode.
Hold above-mentionedly, how to increase not significantly under the prerequisite of production cost, improve the hot spot phenomenon of backlight module, just like become producer and desired most ardently one of problem of solution.
The first reflecting surface that United States Patent (USP) discloses LGP for No. 7102705 tilts with respect to incidence surface, wherein the first reflecting surface and bottom surface of light guide plate homonymy.TaiWan, China patent discloses No. 200907252 and discloses a kind of lighting device, comprises optical plate, prism and CCFL.The LGP end face centre that People's Republic of China's patent discloses a kind of backlight module for No. 100498463 arranges at least one projection, and light source is respectively adjacent to projection setting.No. 6913366 exposure LED of United States Patent (USP) is arranged at the first chamfer surface and second chamfer surface of LGP.
Summary of the invention
The invention provides a kind of backlight module, it can provide the area source that the uniformity is higher.
The invention provides a kind of LGP, it can provide the area source that the uniformity is higher.
Other object of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or entirely object or other object, one embodiment of the invention propose a kind of backlight module, comprise a light supply apparatus and a LGP.Light supply apparatus comprises multiple spot lights of arranging along a bearing of trend, and wherein each spot light is respectively in order to provide a light beam.LGP comprises a rectangular body portion and two triangle protuberances, and main part has one first incidence surface, an exiting surface, a bottom surface with respect to exiting surface, and the first incidence surface is adjacent to bottom surface and exiting surface.The first incidence surface is a rectangle and extends along above-mentioned bearing of trend.Each protuberance wherein outstanding along bearing of trend on one side from two minor faces of the first incidence surface respectively.Each protuberance has respectively one second incidence surface and a mirrored sides, and the second incidence surface is adjacent to the first incidence surface and is parallel to the first incidence surface.Multiple spot lights one of them in the face of of two protuberances.
In one embodiment of this invention, the pass of the length of the first above-mentioned incidence surface and the length of the second incidence surface is 0.3W>2L>0, and wherein W is the length of the first incidence surface, and L is the length of the second incidence surface.
In one embodiment of this invention, above-mentioned light supply apparatus comprises a circuit board, and wherein above-mentioned spot light is multiple light-emitting diode components.These light-emitting diode components along bearing of trend alignment arrangements on circuit board.
In one embodiment of this invention, above-mentioned LGP has the outer peripheral areas of an effective lighting region and between the first incidence surface and effective lighting region, and effective lighting region and the first incidence surface have a beeline.
In one embodiment of this invention, the light beam that these spot lights of part provide can be highlighted the mirrored sides reflection of portion and be passed to outer peripheral areas.
In one embodiment of this invention, above-mentioned LGP also has multiple optical microstructures that are positioned at bottom surface.These optical microstructures are used so that beam divergence.
In one embodiment of this invention, the distribution density of above-mentioned these optical microstructures is along with increasing and increase progressively with the distance of the first incidence surface.
In one embodiment of this invention, the distribution density of above-mentioned these optical microstructures near the first incidence surface presents cyclically-varying on bearing of trend, and the both sides of its distribution density from an optical axis of each spot light along bearing of trend toward optical axis increase progressively.
In one embodiment of this invention, above-mentioned spot light comprises multiple the first spot lights and two second point light sources.These first spot lights are arranged at by the first incidence surface, and the light beam that these first spot lights provide can enter in corresponding main part via the first incidence surface.Two second point light sources are arranged at respectively by the second incidence surface, and wherein these first spot lights are arranged between two second point light sources.The segment beam that each second point light source provides can enter in corresponding protuberance via the second incidence surface, and is reflected offside reflection.
In one embodiment of this invention, the edge of above-mentioned protuberance to the scope of the distance M at second point light source edge is L>M≤0, and wherein L is the length of the second incidence surface.
In one embodiment of this invention, above-mentioned backlight module also comprises two reflector plates, is disposed at respectively in these mirrored sides.
In one embodiment of this invention, the second incidence surface of each protuberance and an angle of mirrored sides are between 25 degree to 65 degree.
In one embodiment of this invention, the minimum of a value α 1 of the angle of the second above-mentioned incidence surface and mirrored sides meets following formula:
The refractive index of the material that wherein n is LGP, W is the length on a long limit of the first incidence surface, a relative edge's of the above-mentioned angle that D is protuberance length.
In one embodiment of this invention, the maximum α 2 of the angle of the second above-mentioned incidence surface and mirrored sides meets following formula:
The refractive index of the material that wherein n is LGP.
One embodiment of the invention propose a kind of LGP, comprise a rectangular body portion and two triangle protuberances.Main part has one first incidence surface, an exiting surface, a bottom surface with respect to exiting surface, and the first incidence surface is adjacent to bottom surface and exiting surface, and the first incidence surface is a rectangle and stretches along a bearing of trend edge.Each protuberance wherein outstanding along bearing of trend on one side from two minor faces of the first incidence surface respectively, each protuberance has respectively one second incidence surface and a mirrored sides, and the second incidence surface is adjacent to the first incidence surface and is parallel to the first incidence surface.
Based on above-mentioned, at backlight module of the present invention, by outwards outstanding protuberance of LGP, the light beam that light supply apparatus is provided, can be effectively through protuberance thus and be led to the outer peripheral areas that is adjacent to the first incidence surface in LGP, to reduce the hot spot phenomenon that outer peripheral areas is produced of LGP, and can increase the briliancy of outer peripheral areas, and then improve the briliancy uniformity of backlight module.
Brief description of the drawings
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing formula to be described in detail as follows.
Figure 1A is the schematic top plan view of the backlight module of one embodiment of the invention.
Figure 1A ' illustrates the part amplification front-view schematic diagram of the backlight module of Figure 1A.
Figure 1B illustrates the local enlarged diagram of the backlight module of Figure 1A.
Fig. 2 A is the schematic diagram that the minimum angles of the angle of the second incidence surface and mirrored sides is calculated in explanation.
Fig. 2 B is the schematic diagram that the maximum angle of the angle of the second incidence surface and mirrored sides is calculated in explanation.
Fig. 2 C to Fig. 2 E is the light path schematic diagram after explanation light beam reflects via mirrored sides.
Fig. 3 A is the schematic top plan view of the backlight module of another embodiment of the present invention.
Fig. 3 B is that the LGP of Fig. 3 A is along the Illumination Distribution figure on hatching line I-I '.
Fig. 3 C is the Illumination Distribution figure of the position of known LGP on the hatching line I-I ' corresponding to Fig. 3 A.
Primary clustering symbol description
100,100 ': backlight module
110: light supply apparatus
120: LGP
120A: effective lighting region
120B: outer peripheral areas
130: circuit board
112: spot light
112a: the first spot light
112b: second point light source
114: light-emitting area
210: main part
212: the first incidence surfaces
212S: minor face
212L: long limit
214: exiting surface
215: the first sides
216: bottom surface
217: the second sides
220: protuberance
222: the second incidence surfaces
224: mirrored sides
226: reflector plate
3a, 3b: solid line
A, D, M: distance
C, C1, C2: light beam
C
m, C
h: light
Dx: bearing of trend
L, K, W: length
P: the spacing of two consecutive points light sources
α, α 1, α 2, α 2 ': angle
θ: divergence of beam angle
X:x axle
Y:y axle
Z:z axle
I-I ': hatching line
Detailed description of the invention
About aforementioned and other technology contents, feature and effect of the present invention, in the detailed description of the following preferred embodiment that coordinates accompanying drawing, can clearly present.The direction term of mentioning in following examples, for example: upper and lower, left and right, front or rear etc. are only the directions with reference to accompanying drawing.Therefore, the direction term of use is to be not used for limiting the present invention for illustrating.
Figure 1A is the schematic top plan view of the backlight module 100 of one embodiment of the invention.Figure 1A ' is that front-view schematic diagram is amplified in the part of Figure 1A.Please refer to Figure 1A and Figure 1A ', the backlight module 100 of the present embodiment comprises a light supply apparatus 110 and a LGP 120.
Specifically, the light supply apparatus 110 in the present embodiment can comprise a circuit board 130, and above-mentioned spot light 112 is configurable on this circuit board.Wherein, spot light 112 is arranged on circuit board 130 along bearing of trend Dx, and is electrically connected with circuit board 130.At this, spot light 112 is for example light emitting diode (light-emitting diode, LED) assembly, LED package (LED package) or other suitable spot light, and circuit board 130 is for example FR-4 printed circuit board (PCB), FR-5 printed circuit board (PCB), metallic core printed circuit board (PCB) (MC-PCB), pliability circuit (flexible printed circuit, FPC) etc.In addition the not number of qualified point light source 112 of the present invention.Those skilled in the art can look the design requirement of its actual product, and with reference to the teaching of the present embodiment, adjust the quantity of the spot light 112 that light supply apparatus 110 has.
The first incidence surface 212 is a rectangle and extends along bearing of trend Dx, each protuberance 220 wherein outstanding along bearing of trend Dx on one side from two minor face 212S of the first incidence surface 212 respectively, each protuberance 220 has respectively one second incidence surface 222 and a mirrored sides 224.In an enforcement, an angle α of the second incidence surface 222 and mirrored sides 224 is between 25 degree to 65 degree.The second incidence surface 222 is adjacent to the first incidence surface 212, and is parallel to the first incidence surface 212.That is to say, the second incidence surface 222 and the first incidence surface 212 can be considered same incidence surface.In addition, the pass of the length L of the length W of the first incidence surface 212 and the second incidence surface 222 is 0.3W>2L>0.In addition, the member that the main part 210 of the LGP 120 of the present embodiment is combined after can be each self-forming with protuberance 220 again, or main part 210 also can be formed in one with protuberance 220.
Specifically, LGP 120 has the outer peripheral areas 120B of an effective lighting region 120A and between the first incidence surface 212 and effective lighting region 120A.At this, a beeline between effective lighting region 120A and the first incidence surface 212 is A, the spacing (pitch) of any two consecutive points light sources 112 is P, and the divergence of beam angle of the light beam C that spot light 112 provides is θ, wherein the region of LGP 120 in the scope of divergence of beam angle θ can form clear zone, and can form dark space in the extraneous region of divergence of beam angle θ.Specifically, effective lighting region 120A refers in LGP 120 and is uniformly distributed corresponding region without above-mentioned clear zone, dark space and brightness, and outer peripheral areas 120B refers to and be adjacent to the first incidence surface 212 in LGP 120, and easily form above-mentioned clear zone, dark space part.
For instance, Figure 1B illustrates the local enlarged diagram of the backlight module 100 of Figure 1A.Please refer to Figure 1A and Figure 1B, the first incidence surface 212 of LGP 120 and the second incidence surface 222 are all towards spot light 112, therefore in the light beam C that enters LGP 120, segment beam C1 can enter LGP 120 via the first incidence surface 212, and segment beam C2 can enter LGP 120 via the second incidence surface 222.Say further, the light beam C1 that part spot light 112 provides can enter the main part 210 of LGP 120 and be passed to effective lighting region 120A from the first incidence surface 212.On the other hand, light beam C2 that part spot light 112 provides can first inject the protuberance 220 of LGP 120 via the second incidence surface 222, and the mirrored sides 224 that is highlighted portion 220 reflexes to outer peripheral areas 120B.
Spot light 112 in the light supply apparatus 110 of Figure 1A can be for example that multiple the first spot light 112a and two second point light source 112b(Figure 1B illustrate one of them of this second point light source 112b), wherein these first spot lights 112a is arranged between two second point light source 112b, that is, the other spot lights 112 of the first incidence surface 212 that are arranged in main part 210 can be considered the first spot light 112a, and the second incidence surface 222 other spot lights 112 that are disposed at each protuberance 220 can be considered respectively second point light source 112b.Second point light source 112b, in the face of protuberance 220, that is to say that second point light source 112b is in the face of the second incidence surface 222.Most light of the light beam C1 that each the first spot light 112a provides can enter via the first incidence surface 212 main part 210 of LGP 120, and most light of the light beam C2 that each second point light source 112b provides can enter via the second incidence surface 222 protuberance 220 of LGP 120, and the light beam C2 that enters the protuberance 220 of LGP 120 can be reflected side 224 and reflexes to outer peripheral areas 120B.In the present embodiment, divergence of beam angle θ is 120 degree, and the second incidence surface 222 is more than or equal to the light-emitting area 114 of second point light source 112b at the half of the length K of bearing of trend Dx, i.e. 2L≤K in the length L of bearing of trend Dx.In addition, the scope of the distance M at the edge of protuberance 220 to second point light source 112b edge (that is the distance M at folded summit to the second point light source 112b edge of the second incidence surface 222 and mirrored sides 224) is L>M≤0.Therefore, second point light source 112b is in the face of being determined by the length L of the second incidence surface 222 position of the second incidence surface 222, if and the length L of the second incidence surface 222 is during much larger than the length K of the light-emitting area 114 of second point light source 112b, multiple second point light source 112b also can be set, but the invention is not restricted to this.For instance, the in the situation that of L-K > M≤0, most light of the light beam C2 that second point light source 112b provides can enter via the second incidence surface 222 protuberance 220 of LGP 120.
In other words, in the backlight module 100 of the present embodiment, part light in the light beam C2 providing due to spot light 112 can be passed to from protuberance 220 the outer peripheral areas 120B of LGP 120, therefore backlight module 100 can effectively reduce hot spot phenomenon, meanwhile, the ratio (A/P) of spacing (pitch) P of beeline A and any two consecutive points light sources 112 also can reduce effectively.In detail, be for example spacing (pitch) P of constant and any two consecutive points light sources 112 of beeline A while strengthening (namely using the spot light 112 of lesser amt), the brightness that still can maintain effective lighting region 120A is even.Therefore, the backlight module 100 of the present embodiment can use the light supply apparatus 110 with spot light 112 negligible amounts, and preferably area source of the light uniformity can be provided.Or be for example that when beeline A diminishes (effective lighting region 120A become large) and spacing (pitch) P of any two consecutive points light sources 112 is constant, the brightness that still can maintain effective lighting region 120A is even.Therefore, the backlight module 100 of the present embodiment can make the light supply apparatus 110 of the spot light 112 of the same quantity of apparatus, but can have larger effective lighting region 120A.
In addition, the present embodiment also optionally configures multiple optical microstructures (not shown) that are positioned at bottom surface 216 on LGP 120.Optical microstructures is for example protruding or recessed site, V-shaped groove (V-shaped grooves) or other optical microstructures (micro-structures) with particular arrangement density, so that the light beam being incident in LGP 120 is easily scattered, increase the probability of light beam from exiting surface 214 outgoing.In a preferred embodiment, the distribution density of optical microstructures on y axle, can be along with increasing and increase progressively with the distance of the first incidence surface 212.Thus, light beam can be derived at exiting surface 214 equably, and promotes the brightness of backlight module 100 in the 120A of effective lighting region, improves according to this forward (along the normal direction that is parallel to exiting surface 214, i.e. z direction of principal axis) briliancy.
Particularly, in the present embodiment, optical microstructures distribution density of (being x direction of principal axis) on bearing of trend Dx near the first incidence surface 212 can present cyclically-varying, and the distribution density of optical microstructures can increase progressively the both sides from an optical axis of each spot light 112 along bearing of trend Dx toward each optical axis.That is, be positioned at outer peripheral areas 120B part, and the distribution density of optical microstructures between the optical axis of the light beam C of each spot light 112, be greater than along the distribution density of the optical microstructures point in the direction of the optical axis of each spot light 112.That is to say, in order to reduce the dark space and the clear zone that produce because of hot spot phenomenon in outer peripheral areas 120B, the present embodiment can easily form dark space part (corresponding to the region between the optical axis of each spot light 112) in outer peripheral areas 120B, increase the configuration of optical microstructures, to reduce the luminance difference between dark space and clear zone.Thus, because the bearing of trend Dx that is configured in of optical microstructures becomes to present cyclically-varying to promote the brightness corresponding to dark space, therefore, reflex to the light of outer peripheral areas 120B via the mirrored sides 224 of protuberance 220, can be scattered to exiting surface 214 by optical microstructures equably.Accordingly, by the distribution density of regulation and control optical microstructures point, backlight module 100 more can provide area source comparatively uniformly.
In addition, the present embodiment can optionally configure reflector plate 226 on the surface of each mirrored sides 224, and wherein reflector plate 226 can reflex to outer peripheral areas 120B by the light beam C2 that enters protuberance 220, further to optimize the optical appearance of backlight module 100.In the present embodiment, reflector plate 226 is for example the blooming piece (multi-function film) with reflection function.In other embodiment, also can in mirrored sides 224, plate reflecting layer and replace reflector plate 226.
Based on above-mentioned, in the present embodiment, part spot light 112(is for example the first spot light 112a) the light beam C1 that provides can enter the main part 210 of LGP 120 and be passed to effective lighting region 120A from the first incidence surface 212, then penetrate outside LGP 120 via exiting surface 214.On the other hand, part spot light 112(is for example second point light source 112b) the segment beam C2 that provides can first inject the protuberance 220 of LGP 120 via the second incidence surface 222, and the mirrored sides 224 that is highlighted portion 220 reflexes to outer peripheral areas 120B, then penetrate outside LGP 120 via exiting surface 214.Thus, by the mirrored sides 224 of protuberance 220, the present embodiment can change the light path of the light beam C2 that is incident to protuberance 220, make segment beam C2 be reflected onto outer peripheral areas 120B via mirrored sides 224, with improve the brightness that is positioned at outer peripheral areas 120B in LGP 120 with and uniformity.On the other hand, under the collocation of optical microstructures, the light beam that is incident in LGP 120 is also preferably led to forward, and the light extraction efficiency that light beam leaves from forward is promoted.By this, the backlight module 100 of the present embodiment can have preferably briliancy uniformity.
It is worth mentioning that the light path after light beam C2 self-reflection side 224 reflections that the above-mentioned spot light of the present embodiment capable of regulating sends.For instance, the present embodiment can be selected the material of suitable LGP 120, the refractive index of main part 210 and protuberance 220 can be identical or different, or adjust the angle α between the second incidence surface 222 and mirrored sides 224, the second incidence surface 222 of each protuberance 220 can, by total reflection effect, be inducted in the outer peripheral areas 120B of main part 210 with the light beam that spot light 112 is provided with mirrored sides 224.
Particularly, angle α between the second incidence surface 222 and the mirrored sides 224 of protuberance 220 can obtain via analog computation, the light being incident upon in mirrored sides 224 can be totally reflected, and the light after reflection is incident upon in outer peripheral areas 120B, make full use of the object of second point light source 112b with the briliancy uniformity of lifting backlight module 100 and realize.The design principle of protuberance 220 of the present invention will be described in detail below.
The course that light enters another medium from a medium can be ear law (Snell ' s Law) and knowing by inference from department.Department is that the relational expression of ear law is as follows:
n
1sinθ
1=n
2sinθ
2 (1)，
Wherein, n1 and n2 are respectively the refractive indexes of two media, θ 1 and θ 2 are respectively the angles (being incidence angle and refraction angle) of incident light and refract light and interface normal, and the minimum incidence angle θ c that wherein total reflection phenomenon occurs is critical angle (critical angle).The refractive index n 2(that is greater than another medium when the refractive index n 1 of a medium is that the refractive index of incident light place medium is higher than the refractive index of refract light place medium), and incidence angle θ 1 is while being greater than critical angle θ c, has total reflection phenomenon and occurs.
It is worth mentioning that, in the present embodiment, medium is respectively air and LGP 120, the wherein refractive index n of air
1be 1.0, the material of LGP 120 is taking polymethyl methacrylate (PMMA) as example, its refractive index n
2be 1.49.Therefore,, in the time that light beam C2 is incident in the mirrored sides 224 of protuberance 220, the refractive index that can meet incident light place medium (is the refractive index n of polymethyl methacrylate
2) (be the refractive index n of air higher than the refractive index of refract light place medium
1) condition.Thus, the present embodiment can be by the material of the LGP 120 of selection different refractivity, meet the light that spot light 112b sends and enter after protuberance 220, can total reflection phenomenon occur in mirrored sides 224, use regulation and control light beam C2 and be reflected the light path after 224 reflections of side.
Fig. 2 A is the schematic diagram that the minimum angles of the angle α of the second incidence surface 222 and mirrored sides 224 is calculated in explanation, and the second point light source 112b that wherein arranges in pairs or groups describes.Please refer to Fig. 2 A, in the light beam C2 providing at second point light source 112b, if be positioned at the chief ray C of light beam C2
mthe light C with half intensity of one side
h(the right-hand light C with half intensity of chief ray Cm that the second point light source 112b on the left of being positioned at as shown in Figure 2 A sends
h) through after mirrored sides 224 reflections, while being passed to the half (being passed to the W/2 of LGP 120) of LGP 120 length W, now the angle α between the second incidence surface 222 and mirrored sides 224 is minimum of a value α 1, wherein α 1 meets following formula:
Wherein n is the refractive index of the material of LGP 120, and W is the length of the long limit 212L of the first incidence surface 212, and D is a relative edge's of the angle α of protuberance 220 length, and in addition, α 1 ' is chief ray C
mthe light C with half intensity of one side
hfrom the second incidence surface 222 enter protuberance 220 refraction angle (not shown) and
in other words,, from above-mentioned formula (2), the minimum of a value α 1 of the angle α between the second incidence surface 222 and mirrored sides 224 is relevant with the refractive index of material and the size of LGP 120 of LGP 120.
Fig. 2 B is the schematic diagram that the maximum angle of the angle α of the second incidence surface 222 and mirrored sides 224 is calculated in explanation, the local enlarged diagram of the backlight module 100 that wherein Fig. 2 B is Figure 1B, and collocation second point light source 112b describes.Please refer to Fig. 2 B, in the light beam C2 providing at second point light source 112b, if be positioned at the chief ray C of light beam C
mthe light C with half intensity of one side
h(the chief ray C that second point light source 112b as shown in Figure 2 B sends
mleft has the light C of half intensity
h), through the light path after mirrored sides 224 reflection, when being parallel to bearing of trend Dx, now the angle α of the second incidence surface 222 and mirrored sides 224 is maximum α 2, wherein α 2 meets following relational expression:
Wherein n is the refractive index of the material of LGP 120, and α 2 ' is chief ray C
mthe light C with half intensity of one side
hfrom the second incidence surface 222 enter protuberance 220 refraction angle and
from above-mentioned formula (3), the material of LGP 120 can affect the angle α maximum α 2 between the second incidence surface 222 and mirrored sides 224.Specifically, if the material of LGP 120 is polymethyl methacrylate, the refractive index of polymethyl methacrylate is 1.49, and α 2 is 62.76 degree.If the material of LGP 120 is glass, the refractive index of glass is 1.5, and α 2 is 62.63 degree.If the material of LGP 120 is polycarbonate (Polycarbonate, PC), the refractive index of polycarbonate is the highest can be 1.64, and α 2 is 60.93 degree.
Under for further illustrating the second incidence surface 222 and mirrored sides 224 when the different angle α, the light path after the light beam C2 that second point light source 112b provides reflects via mirrored sides 224.Fig. 2 C to Fig. 2 E is the light path schematic diagram after explanation light beam reflects via mirrored sides, and wherein, shown the second incidence surface 222 of Fig. 2 C to Fig. 2 E is different from the angle α of mirrored sides 224.
Please refer to Fig. 2 C, when the second incidence surface 222 and the angle α of mirrored sides 224 are about 45 while spending, the chief ray C of the light beam C2 that second point light source 112b provides
mcan be parallel to bearing of trend Dx through the light path after mirrored sides 224 reflections, and be positioned at chief ray C
mthe light C with half intensity of one side
h(the chief ray C that second point light source 112b as shown in Figure 2 C sends
mleft has the light C of half intensity
h), can be incident in the outer peripheral areas 120B of LGP 120.That is to say, in the light beam C2 providing at second point light source 112b, approximately have the light of half to reflect and to be passed to outer peripheral areas 120B via mirrored sides 224.
Please refer to Fig. 2 D, when the second incidence surface 222 and the angle α of mirrored sides 224 are less than 45 while spending, the chief ray C of the light beam C2 that second point light source 112b provides
mreflect afterwards partially closely outer peripheral areas 120B through mirrored sides 224, and be positioned at chief ray C
mthe light C with half intensity of one side
h(the chief ray C that second point light source 112b as shown in Figure 2 D sends
mleft has the light C of half intensity
h), also can be incident in the outer peripheral areas 120B of LGP 120.In other words,, in the light beam C2 providing at second point light source 112b, there is light more than half to reflect and to be passed to outer peripheral areas 120B via mirrored sides 224.
Please refer to Fig. 2 E, when the second incidence surface 222 and the angle α of mirrored sides 224 are greater than 45 while spending, the chief ray C of the light beam C2 that second point light source 112b provides
mthrough can more inclined to one side near lightning region 120A(after mirrored sides 224 reflection towards the direction transmission away from the first incidence surface 212), but be positioned at chief ray C
mthe light C with half intensity of one side
h(the chief ray C that second point light source 112b as shown in Figure 2 E sends
mleft has the light C of half intensity
h), also can reflect and be passed to the outer peripheral areas 120B of LGP 120 via mirrored sides 224.
From the above, the light beam C2 that second point light source 112b provides enters after protuberance 220 from the second incidence surface 222, can reflect and change the light path of light beam C2 via mirrored sides 224, and be led to the outer peripheral areas 120B of LGP 120, not only effectively improve the utilization rate of spot light, also can improve spot light and be incident to the brightness of outer peripheral areas 120B.Thus, the outer peripheral areas 120B of the LGP 120 of the present embodiment can significantly reduce the bright hot spot phenomenon secretly replacing, and then improves the briliancy uniformity of backlight module 100.
Under further illustrate the comparison of the LGP of the present embodiment and the Illumination Distribution of known LGP.Fig. 3 A is the schematic top plan view of the backlight module 100 ' of another embodiment of the present invention, wherein backlight module 100 ' adopts the LGP 120 of Figure 1A and has the light supply apparatus 110 of five spot lights 112, and hatching line I-I ' is 6mm apart from the distance A (being the beeline between effective lighting region 120A and the first incidence surface 212) of the first incidence surface 212 of LGP 120, and the spacing P of two consecutive points light sources 112 is 10mm, that is the ratio of A/P is 0.6.Fig. 3 B is that the LGP 120 of Fig. 3 A is along the Illumination Distribution figure (as shown in solid line 3a) on hatching line I-I '.Fig. 3 C is the Illumination Distribution figure (as shown in solid line 3b) of the position of known LGP on the hatching line I-I ' corresponding to Fig. 3 A.
Illumination Distribution figure by Fig. 3 B and Fig. 3 C can find out, the exiting surface of known LGP has obvious fluctuating in the Illumination Distribution corresponding to obtaining on hatching line I-I ' (as shown in solid line 3b), that is the illumination of light has significantly bright dark contrast.But, compared to known LGP, the LGP 120 of the present embodiment there is no obvious fluctuating along the Illumination Distribution (as shown in solid line 3a) on hatching line I-I ', that is to say, the LGP 120 of the present embodiment can improve the phenomenon of the comparison of light and shade inequality of known LGP.Accordingly, the LGP 120 that the present embodiment can be described can make the region of more light by luminance shortage to improve the bright dark poor excessive situation of LGP, and then makes backlight module 100 ' have more uniform Luminance Distribution.In addition, the briliancy of the LGP 120 of the present embodiment on hatching line I-I ' is greatly about 2300 nits (Nits) left and right, and the briliancy of known LGP on hatching line I-I ' is greatly about 400 nit left and right, hence one can see that, and the LGP 120 of the present embodiment also can significantly promote in the briliancy at 120A edge, effective lighting region.
In sum, embodiments of the invention can have at least one of following advantages or effect.In backlight module of the present invention, because LGP has adopted outside outstanding protuberance, change the light path of the light beam that is incident in mirrored sides, therefore light beam can be passed to the outer peripheral areas of LGP effectively, be positioned at the hot spot phenomenon of outer peripheral areas to improve LGP, and can increase the briliancy of outer peripheral areas.By this, adopt the backlight module of this LGP that the area source that the uniformity is higher can be provided.
The foregoing is only the preferred embodiments of the present invention, can not limit scope of the invention process with this, i.e. all simple equivalences of doing according to the claims in the present invention and description change and amendment, all still belong to the scope that patent of the present invention covers.In addition, arbitrary embodiment of the present invention or claim must not realize the disclosed whole objects of the present invention or advantage or feature.In addition, summary and denomination of invention are only for the use of auxiliary patent document retrieval, are not used for limiting interest field of the present invention.In addition, " first ", " second " etc. in this description or claim, mentioned be only in order to name the title of assembly (element) or to distinguish different embodiment or scope, and be not used for the quantitative upper limit of limiter assembly or lower limit.
Claims (23)
1. a backlight module, comprises a light supply apparatus and a LGP,
Described light supply apparatus comprises multiple spot lights of arranging along a bearing of trend, and wherein each described spot light is respectively in order to a light beam to be provided,
Described LGP comprises a rectangular body portion and two triangle protuberances, wherein said main part has one first incidence surface, one exiting surface, one bottom surface with respect to described exiting surface, described the first incidence surface is adjacent to described bottom surface and described exiting surface, and described the first incidence surface is a rectangle and extends along described bearing of trend, each described protuberance wherein outstanding along described bearing of trend on one side from two minor faces of described the first incidence surface respectively, each described protuberance has respectively one second incidence surface and a mirrored sides, described the second incidence surface is adjacent to described the first incidence surface and is parallel to described the first incidence surface,
Wherein at least described multiple spot lights one of them in the face of of described two protuberances.
2. backlight module as claimed in claim 1, it is characterized in that, the pass of the length of the length of described the first incidence surface and described the second incidence surface is 0.3W>2L>0, wherein W is the length of described the first incidence surface, and L is the length of described the second incidence surface.
3. backlight module as claimed in claim 1, is characterized in that, described light supply apparatus comprises:
One circuit board, wherein these spot lights are multiple light-emitting diode components, these light-emitting diode components along described bearing of trend alignment arrangements on described circuit board.
4. backlight module as claimed in claim 1, it is characterized in that, described LGP has the outer peripheral areas of an effective lighting region and between described the first incidence surface and described effective lighting region, and described effective lighting region and described the first incidence surface have a beeline.
5. backlight module as claimed in claim 4, is characterized in that, the described light beam that these spot lights of part provide can be passed to described outer peripheral areas by the described mirrored sides reflection of described protuberance.
6. backlight module as claimed in claim 1, is characterized in that, described LGP also has multiple optical microstructures that are positioned at described bottom surface, and these optical microstructures are used so that described beam divergence.
7. backlight module as claimed in claim 6, is characterized in that, the distribution density of these optical microstructures is along with increasing and increase progressively with the distance of described the first incidence surface.
8. backlight module as claimed in claim 6, it is characterized in that, distribution density near these optical microstructures of described the first incidence surface presents cyclically-varying on described bearing of trend, and the both sides of its distribution density from an optical axis of each described spot light along described bearing of trend toward described optical axis increase progressively.
9. backlight module as claimed in claim 1, is characterized in that, these spot lights comprise:
Multiple the first spot lights, are arranged at by described the first incidence surface, and the light beam that these first spot lights provide can enter in corresponding described main part via described the first incidence surface; And
Two second point light sources, be arranged at respectively by described the second incidence surface, wherein these first spot lights are arranged between described two second point light sources, the segment beam that each described second point light source provides can enter in corresponding described protuberance via described the second incidence surface, and is reflected by corresponding described mirrored sides.
10. backlight module as claimed in claim 9, is characterized in that, the scope of the distance M at the edge of described protuberance to described second point light source edge is L>M≤0, and wherein L is the length of described the second incidence surface.
11. backlight modules as claimed in claim 1, is characterized in that, also comprise:
Two reflector plates, are disposed at respectively in these mirrored sides.
12. backlight modules as claimed in claim 1, is characterized in that, described second incidence surface of each described protuberance and an angle of described mirrored sides are between 25 degree to 65 degree.
13. backlight modules as claimed in claim 12, is characterized in that, the minimum of a value α 1 of the described angle of each described the second incidence surface and described mirrored sides meets following formula:
The refractive index of the material that wherein n is described LGP, W is the length on a long limit of described the first incidence surface, a relative edge's of the described angle that D is described protuberance length.
14. backlight modules as claimed in claim 12, is characterized in that, the maximum α 2 of the described angle of each described the second incidence surface and described mirrored sides meets following formula:
The refractive index of the material that wherein n is described LGP.
15. 1 kinds of LGPs, comprise a rectangular body portion and two triangle protuberances,
Described rectangular body portion has one first incidence surface, an exiting surface, a bottom surface with respect to described exiting surface, and described the first incidence surface is adjacent to described bottom surface and described exiting surface, and described the first incidence surface is a rectangle and extends along a bearing of trend,
Each described protuberance in described two triangle protuberances wherein outstanding along described bearing of trend on one side from two minor faces of described the first incidence surface respectively, each described protuberance has respectively one second incidence surface and a mirrored sides, and described the second incidence surface is adjacent to described the first incidence surface and is parallel to described the first incidence surface.
16. LGPs as claimed in claim 15, it is characterized in that, the pass of the length of the length of described the first incidence surface and described the second incidence surface is 0.3W>2L>0, wherein W is the length of described the first incidence surface, and L is the length of described the second incidence surface.
17. LGPs as claimed in claim 15, is characterized in that, described LGP also has multiple optical microstructures that are positioned at described bottom surface, and these optical microstructures are used so that beam divergence.
18. LGPs as claimed in claim 17, is characterized in that, the distribution density of these optical microstructures is along with increasing and increase progressively with the distance of described the first incidence surface.
19. LGPs as claimed in claim 17, is characterized in that, the distribution density of these optical microstructures of close described the first incidence surface presents periodically density and changes on described bearing of trend.
20. LGPs as claimed in claim 15, is characterized in that, also comprise:
Two reflector plates, are disposed in these mirrored sides.
21. LGPs as claimed in claim 15, is characterized in that, described second incidence surface of each described protuberance and an angle of described mirrored sides are between 25 degree to 65 degree.
22. backlight modules as claimed in claim 21, is characterized in that, the minimum of a value α 1 of the described angle of each described the second incidence surface and described mirrored sides meets following formula:
The refractive index of the material that wherein n is described LGP, W is the length on a long limit of described the first incidence surface, a relative edge's of the described angle that D is described protuberance length.
23. backlight modules as claimed in claim 21, is characterized in that, the maximum α 2 of the described angle of each described the second incidence surface and described mirrored sides meets following formula:
The refractive index of the material that wherein, n is described LGP.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101150248A TW201426125A (en) | 2012-12-26 | 2012-12-26 | Light guide plate and backlight module |
| TW101150248 | 2012-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103900033A true CN103900033A (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310629026.8A Pending CN103900033A (en) | 2012-12-26 | 2013-11-29 | Light guide plate and backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103900033A (en) |
| TW (1) | TW201426125A (en) |
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| CN111140781A (en) * | 2018-11-02 | 2020-05-12 | 光宝电子(广州)有限公司 | Light source module and adjusting method thereof |
| WO2021012890A1 (en) * | 2019-07-24 | 2021-01-28 | 佛山市国星光电股份有限公司 | Led line backlight source liquid crystal display screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI799306B (en) * | 2021-03-11 | 2023-04-11 | 瑞儀光電股份有限公司 | Backlight module and display device |
| TWI773182B (en) | 2021-03-11 | 2022-08-01 | 瑞儀光電股份有限公司 | Backlight module and display device |
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Also Published As
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| TW201426125A (en) | 2014-07-01 |
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