CN109521515A - Light guide plate and preparation method thereof, backlight module and display device - Google Patents
Light guide plate and preparation method thereof, backlight module and display device Download PDFInfo
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- CN109521515A CN109521515A CN201910001542.3A CN201910001542A CN109521515A CN 109521515 A CN109521515 A CN 109521515A CN 201910001542 A CN201910001542 A CN 201910001542A CN 109521515 A CN109521515 A CN 109521515A
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000000839 emulsion Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 230000004446 light reflex Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention provides a kind of light guide plate and preparation method thereof, backlight module and display device, wherein light guide plate, comprising: light conducting plate body；Optical path control layer, it is formed in the first face of the light conducting plate body, for carrying out deviation to the light for injecting the optical path control layer from the light conducting plate body, so that being less than default peep-proof angle from the angle between the light and normal that the light-emitting surface of the light conducting plate body projects, wherein, first face is the face opposite with the light-emitting surface, and the refractive index of the optical path control layer is lower than the refractive index of the light conducting plate body.Tabula rasa provided by the invention and preparation method thereof, backlight module and display device can reduce the manufacturing cost of display device.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of light guide plate and preparation method thereof, backlight module and displays
Device.
Background technique
With the development of network technology, more and more people do shopping on network or the operations such as account trading.?
During aforesaid operations, user is frequently necessary to input the privacies such as personal information, password letter in the display devices such as computer, mobile phone
Breath, and the people of surrounding may view the leakage that these privacy informations cause user privacy information.Therefore, more and more displays
Device has peep-proof function.
In the prior art, display peep-proof effect is generally reached by way of increasing by one layer of peep-proof film on the display apparatus
Fruit, still, peep-proof film it is expensive, increase the cost of manufacture of display device.
Summary of the invention
The embodiment of the present invention provides a kind of light guide plate and preparation method thereof, backlight module and display device, to solve backlight
The high problem of the cost of manufacture of mould group.
It is as follows that in order to solve the above technical problem, the present invention provides technical solutions:
In a first aspect, the embodiment of the present invention provides a kind of light guide plate, comprising:
Light conducting plate body；
Optical path control layer is formed in the first face of the light conducting plate body, for injecting institute to from the light conducting plate body
The light for stating optical path control layer carries out deviation, so that between the light and normal that the light-emitting surface of the light conducting plate body projects
Angle is less than default peep-proof angle, wherein first face is the face opposite with the light-emitting surface, the folding of the optical path control layer
Penetrate the refractive index that rate is lower than the light conducting plate body.
Further, the optical path control layer includes:
Flat part, the flat part cover the first face of the light conducting plate body；
Lug boss, from the flat part away from the one side protrusion of the light conducting plate body, for changing the angle of propagation of light
Degree, and the light-emitting surface that light reflexes to the light conducting plate body is projected.
Further, the lug boss includes multiple prism structures, and each prism structure includes end to end first
Side, second side and third side, the first side connect with the flat part and two neighboring prism structure first
Side is connected with each other；The second side is plane, and light reflects in the second side, and light is in the third side
Refraction or reflection occur on face.
Further, the third side is plane or curved surface.
Further, the angle between the first side and second side of the prism structure is greater than 70 ° and less than 90 °.
Further, the optical path control layer is made by light-sensitive emulsion.
Further, light guide plate further includes the prism site being formed on the light-emitting surface of the light conducting plate body, the rib
Mirror site includes inclined-plane, and the inclined-plane is arranged away from the side of the light conducting plate body.
Second aspect, the embodiment of the present invention also provide a kind of backlight module, including light guide plate as described above.
The third aspect, the embodiment of the present invention also provide a kind of display device, including backlight module as described above.
Fourth aspect, the embodiment of the present invention also provide a kind of production method of light guide plate, which comprises
According to oblique in the refractive index of the light conducting plate body, the refractive index of the optical path control layer and the prism site
Angle between face and the light-emitting surface of the light conducting plate body determines first side described in the prism structure, described second
The mutual angle in side and the third side；
According to first side described in the prism structure, the mutual folder of the second side and the third side
Angle makes the optical path control layer on the first face of the light conducting plate body.
In technical solution provided by the invention, the light injected in optical path control layer from light conducting plate body can be according to optical path control
Deviation occurs for the design of preparative layer, and finally projects from the light-emitting surface that optical path control layer reflexes to light conducting plate body, and after reflecting from
The angle between light and normal that the light-emitting surface of light conducting plate body projects is less than default peep-proof angle.In such manner, it is possible to not increasing
The peep-proof effect for reaching display device in the case where adding peep-proof film, reduces the cost of manufacture of display device.Therefore, the present invention provides
Technical solution can reduce the manufacturing cost of display device.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the light guide plate that one embodiment of the invention provides；
One of the cross-sectional view of prism structure in the light guide plate that Fig. 2 a provides for one embodiment of the invention；
One of the cross-sectional view of prism structure in the light guide plate that Fig. 2 b provides for one embodiment of the invention；
One of the cross-sectional view of prism structure in the light guide plate that Fig. 2 c provides for one embodiment of the invention；
Fig. 3 is the index path in the light guide plate that one embodiment of the invention provides；
The deflection angle of light and the relational graph of incidence angle in the light guide plate that Fig. 4 provides for one embodiment of the invention；
Fig. 5 a is to coat photoresist in the first face of light conducting plate body when making the light guide plate that one embodiment of the invention provides
Structural schematic diagram；
Fig. 5 b forms the schematic diagram of optical path control layer on a photoresist by mold transfer after being Fig. 5；
The position view of prism site and light conducting plate body in the light guide plate that Fig. 6 provides for one embodiment of the invention；
Distribution schematic diagram of the prism site in light-emitting surface in the light guide plate that Fig. 7 provides for one embodiment of the invention；
Fig. 8 is the structural schematic diagram for the mold that production is used to form prism site；
It include the structural schematic diagram of prism site in the light guide plate that Fig. 9 provides for one embodiment of the invention；
Light is only by prism site deviation direction and not by optical path in the light guide plate that Figure 10 a provides for one embodiment of the invention
The luminance graph of emergent ray when control layer deviation direction；
Figure 10 b is the corresponding raster pattern of Figure 10 a；
Figure 11 a is light in Figure 10 a by the luminance graph behind optical path control layer deviation direction；
Figure 11 b is the corresponding raster pattern of Figure 11 a；
Figure 12 is the flow chart of the production method for the light guide plate that one embodiment of the invention provides；
Figure 13 is the structural schematic diagram for the backlight module that one embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In the prior art, increase peep-proof film usually in display module to realize the peep-proof effect of display device, however, increasing
The peep-proof visible angle of display device after adding peep-proof film also still has 40 °, and peep-proof effect is poor；And due to peep-proof film
Price is higher, and the cost of manufacture for also resulting in display device is higher；In addition, realizing that peep-proof function can also reduce display by peep-proof film
The display brightness of device.
The present invention is to solve the above problems, provide a kind of light guide plate and preparation method thereof, backlight module and display device, energy
Enough above problems that peep-proof film is avoided under the premise of display device realizes peep-proof.
The embodiment of the present invention provides a kind of light guide plate, as shown in Figure 1, comprising:
Light conducting plate body 110；
Optical path control layer 120 is formed in the first face of the light conducting plate body 110, for from the light conducting plate body
110 light for injecting the optical path control layer 120 carry out deviation, so that projected from the light-emitting surface of the light conducting plate body 110
Angle between light and normal is less than default peep-proof angle, wherein first face is the face opposite with the light-emitting surface, institute
The refractive index for stating optical path control layer 120 is lower than the refractive index of the light conducting plate body 110.
In the embodiment of the present invention, the light injected in optical path control layer 120 from light conducting plate body 110 can be according to light path control
Deviation occurs for the design of layer 120, and finally projects from the light-emitting surface that optical path control layer 120 reflexes to light conducting plate body 110, and anti-
It is less than default peep-proof angle from the angle between the light and normal that the light-emitting surface of light conducting plate body 110 projects after penetrating.In this way, energy
Enough peep-proof effects for reaching display device in the case where not increasing peep-proof film, reduce the cost of manufacture of display device.Therefore, originally
The technical solution that invention provides can reduce the manufacturing cost of display device.
Above-mentioned light guide plate 100 can be applied in side entrance back module, and the incidence surface of light conducting plate body 110 is located at light
Between face and the first face and towards light source.
The refractive index of light conducting plate body 110 is n1, the refractive index of optical path control layer 120 is n2, the refractive index of air is n0,
Wherein, n1> n2> n0, can be calculated by angle of total reflection calculation formula: being all-trans between light conducting plate body 110 and air
Firing angle is λ0=arcsin (n0/n1), the angle of total reflection between light conducting plate body 110 and optical path control layer 120 is λ1=arcsin
(n2/n1), the angle of total reflection between optical path control layer 120 and air is λ2=arcsin (n0/n2)。
The light that light source projects enters after light conducting plate body 110 and is less than λ with the normal angle in the first face1Light can inject
Optical path control layer 120, a small amount of light are emitted directly toward optical path control layer 120, this some light can be blocked by shading glue,
Guarantee peep-proof effect.The light that light source projects enters after light conducting plate body 110 and is greater than λ with the normal angle of light-emitting surface0Light
Full transmitting occurs for light-emitting surface of the meeting in light conducting plate body 110, is greater than λ with the normal angle in the first face1Light can be in leaded light
The first face on plate ontology 110 is totally reflected.
Above-mentioned default peep-proof angle can achieve 20 ° or 30 °, can also be after designing optical path control layer 120
10 °, the visible angle of peep-proof is small, and peep-proof effect is good.The available different default peep-proof of design of different light paths control layer 120
Angle, each angle is merely illustrative herein, is not construed as limitation of the invention.
Incident ray in light conducting plate body 110 and the angle between the normal in the first face are α1, into optical path control layer
Angle between 120 refracted light and the normal in the first face is α2, pass through refraction angle calculation formula α1And α2Meet such as ShiShimonoseki
System: α2=arcsin (n1×sinα1/n2).Light after entering optical path control layer 120 it also occur that refraction at least once with
Deviation light, the angle change of each deviation can refer to above-mentioned refraction angle calculation formula.
Light into optical path control layer 120 can be totally reflected during once dredging from the close directive light of light, thus
The light-emitting surface that light reflexes to light conducting plate body 110 projects.
In some alternative embodiments, as shown in Figure 1, the optical path control layer 120 includes:
Flat part 121, the flat part cover the first face of the light conducting plate body 110；
Lug boss 122, from the flat part 121 away from the one side protrusion of the light conducting plate body 110, for changing light
Propagation angle, and by light reflex to the light conducting plate body 110 light-emitting surface project.
Flat part 121 covers the light conducting plate body 110, and for receiving, to penetrate angle in the first face and between normal small
In λ1Incident ray, and make these incident rays by flat part 121 enter lug boss 122.
Lug boss 122 can be in flat part 121 away from the multiple bulge-structures of one side protrusion of light guide body, multiple protrusion knots
Structure can be identical shape, be also possible to different shapes.Each bulge-structure is capable of forming the inclined-plane of multiple and different angles,
To which the propagation angle to light carries out constantly deviation, until total reflection occurs in a wherein bulge-structure to go out
Smooth surface projects.
Light can reach total reflection condition merely through a bulge-structure, and the light after deviation is projected from bulge-structure
To the light-emitting surface of light conducting plate body 110；Light is also possible to reach total reflection condition by multiple bulge-structures, the light after deviation
Line is projected from bulge-structure to the light-emitting surface of light conducting plate body 110.Light undergoes the quantity of bulge-structure and the shape of bulge-structure
Shape is related, and the incident angle with light in flat part 121 is also related, and in the case where bulge-structure is unified, incident angle is smaller
The bulge-structure of experience is more, and the number for needing to deflect before reaching total reflection condition is more.
Further, as shown in Figure 1, the lug boss 122 includes multiple prism structures, each prism structure includes head
Tail connected first side, second side and third side, the first side are connect and two neighboring with the flat part 121
The first side of prism structure is connected with each other；The second side is plane, and light reflects in the second side, light
Line occurs to reflect or be reflected on the third side.
In the present embodiment, lug boss 122 includes the prism structure of multiple uniform shapes, and multiple prism structures are tight between each other
Close connection.Wherein, light needs are likely to be totally reflected from optically denser medium directive optically thinner medium, and therefore, second side is light
For line from the one side of air directive prism structure, third side is one side of the light from prism structure directive air.Wherein, in order to keep away
Exempt from light to occur to be totally reflected on the second side but also light can be enabled to draw close to horizontal direction, first side and second side
Between angle can be greater than 70 ° and less than 90 °.
In the case where light reaches total reflection condition, light can be from third offside reflection to the hair of light conducting plate body 110
Smooth surface project, in the case where light is not up to total reflection condition, light can third side reflect inject air in, light after
It is continuous to enter next prism structure deviation direction of propagation.
Wherein, third side can be plane (sectional view of lug boss 122 is as shown in Figure 2 a) or curved surface (lug boss
122 sectional view is as shown in Fig. 2 b and Fig. 2 c).After light reaches total reflection condition, light is reflected onto light-emitting surface.
Be illustrated using third side as plane, referring to Fig. 3, Fig. 3 be Ray Of Light through optical path control layer 120 most
It is reflected onto the index path that the light-emitting surface of light conducting plate body 110 projects eventually.Light is flat from the first face directive of light conducting plate body 110
Refraction angle after smooth layer is α2, later, light beam is with θ1Incidence angle penetrate on the third side in n-th of prism structure, due to light
From optically denser medium directive optically thinner medium and incident light is located at the counter clockwise direction of interface normal, therefore light is counterclockwise
It is propagated after deflection；Later, light beam is penetrated in the second side of (n+1)th prism structure, since light is from optically thinner medium directive light
Close medium and incident light are located at the suitable pointer direction of interface normal, therefore light deflects counterclockwise again；Later, light beam
With θ2(θ2> θ1) incidence angle penetrate on the third side in (n+1)th prism structure, due to light from optically denser medium directive light dredge
Medium and incident light are located at the counter clockwise direction of interface normal, thus light deflect counterclockwise after propagate；Later, light
Beam is in the second side of the n-th+2 prism structures, and light is from optically thinner medium directive optically denser medium at this time and incident light is located at
The anti-clockwise direction of interface normal, thus light deflect clockwise after propagate；Later, light beam is with θ3(θ3> θ2) enter
Firing angle is penetrated on the third side in the n-th+2 prism structures, since light is from optically denser medium directive optically thinner medium and incidence angle θ3
> angle of total reflection λ2, so that the light-emitting surface that light is reflected onto light conducting plate body 110 projects.
Wherein, in the refracting process to light incidence angle with the deflecting relationship before refraction angle as shown in figure 4, can see
Incidence angle is bigger out, and refraction angle is also bigger.Therefore, peep-proof angle of visibility is improved in turn in order to improve the precision controlling of deflection of light
The control of degree, can design the angle of each deviation of light between 5 ° to 10 ° i.e. light in a second side or third side
Deflection angle on face not only ensure that deviation efficiency in this way but also be convenient for the accurate control of optical path between 5 ° to 10 °.
In the embodiment of the present invention, the optical path control layer 120 can be to be made by light-sensitive emulsion.For making optical path control
The refractive index of the light-sensitive emulsion of preparative layer 120 can be less than 1.4.By the way that light-sensitive emulsion is coated on the first face of light conducting plate body 110
(as shown in Figure 5 a), may then pass through mold be transferred on light-sensitive emulsion make optical path control layer 120 form after, pass through ultraviolet light
Irradiation under solidify light-sensitive emulsion, to obtain optical path control layer 120 (as shown in Figure 5 b).The refractive index etc. of optical path control layer 120
Refractive index in light-sensitive emulsion and the refractive index less than light conducting plate body 110.
In some alternative embodiments, as shown in fig. 6, light guide plate 100 further includes being formed in the light conducting plate body 110
Light-emitting surface on prism site 130, the prism site 130 include inclined-plane, the inclined-plane deviate from the light conducting plate body 110
Side setting.
Prism site 130 can be (such as Fig. 7) freely to arrange on the light-emitting surface of light conducting plate body 110, prism site
130 include at least one away from the inclined-plane that light conducting plate body 110 is arranged, and the angle between inclined-plane and light-emitting surface is β (such as Fig. 6 institute
Show).When the angle between the normal of light and light-emitting surface in light conducting plate body 110 is greater than angle of total reflection λ0When, in light guide plate
The light of inner total reflection can reduce the angle of 2 times of β after slant reflection.To which light is changing reduction angle by inclined-plane at least once
After degree, it can be less than when injecting the first face with the incidence angle in the first face in the light of 110 inner total reflection of light conducting plate body originally and lead
Angle of total reflection λ between tabula rasa ontology 110 and optical path control layer 1201, hence into optical path control layer 120.Wherein, prism net
Point 130 can be triangular prism structure, and the first side of prism site 130 is parallel with light-emitting surface and is bonded light-emitting surface setting, and second
The angle β of side and first side is between 0.5-10 °, and the angle of third side and first side is between 30-90 °.
After prism site 130 can be by hitting technique or artistic carving processing mold (as shown in Figure 8), pass through injection molding
The mode of molding or imprinting moulding forms prism site 130 (as shown in Figure 9) in the light-emitting surface of light guide plate.
In the case where light conducting plate body 110 has prism site 130, illustrates and how to design rib in lug boss 122
The interior angle of rod structure: assuming that the refractive index n of light conducting plate body 1101=1.58, the refractive index n of optical path control layer 1202=
1.34, air refraction n0=1 and prism site 130 in angle β between inclined-plane and the light-emitting surface of light conducting plate body 110=
5 °, it can be deduced that: the angle of total reflection λ between optical path control layer 120 and light conducting plate body 1101=arcsin (n2/n1)=58 °,
The angle injected between the refracted light of optical path control layer 120 and the normal in the first face from light conducting plate body 110 is α2=
arcsin(n1×sin(λ1-β)/n2)=70.35 °, angle=70.35- θ between third side and first side1；And due to
In order to accurately control the deviation of light, each light limits only 5-10 ° of deviation, may thereby determine that out θ1In 14.2-261 °
Between, and then the angle calculated between third side and first side can be 44.25-56.15 °, such as section central value
50.2°。
Light in light conducting plate body 110 is only by 130 deviation direction of prism site and not by 120 deviation of optical path control layer
When direction, the luminance graph of the corresponding emergent ray of simulation model as shown in Figure 10 a, the raster pattern of emergent ray as shown in fig. lob,
It can be seen that light concentrates on relatively narrow section, and tilts and project.Subsequent emergent ray third side and first after optimization
After the optical path adjusting layer of angle=48.56 ° between side, the corresponding peep-proof effect of simulation model sees Figure 11 a and figure
11b, it can be seen that angle of view is shunk, and half-value angle is ± 10 °, and angle of cut-off is 20 °, has preferable peep-proof effect.
The embodiment of the present invention also provides a kind of production method of light guide plate, for make and meanwhile include above-mentioned prism site and
The light guide plate of above-mentioned prism structure, as shown in figure 12, method includes:
Step 1201: according to the refractive index of the light conducting plate body, the refractive index of the optical path control layer and the rib
Angle in mirror site between inclined-plane and the light-emitting surface of the light conducting plate body determines the first side described in the prism structure
Face, the mutual angle of the second side and the third side；
Step 1202: according to first side described in the prism structure, the second side and third side phase
Angle between mutually, makes the optical path control layer on the first face of the light conducting plate body.
In the embodiment of the present invention, can by the refractive index of light conducting plate body, the refractive index of the optical path control layer and
Angle in the prism site between inclined-plane and the light-emitting surface of the light conducting plate body determines prism knot in optical path control layer
Each angle inside structure, and produce light guide plate, the low manufacture cost and light that will not be projected to light-emitting surface have any blocking, really
Protect the brightness of display.
Predefine the refractive index n of material used in light conducting plate body and optical path control layer1And n2, and then calculate light guide plate
The angle of total reflection between ontology and optical path control layer is λ1=arcsin (n2/n1)；It is penetrated in prism site by preset
Angle between inclined-plane and the light-emitting surface of light guide plate plate body, passes through α2=arcsin (n1×sin(λ1-β)/n2) come calculate from
Light conducting plate body injects the angle between the refracted light of optical path control layer and the normal in the first face；Then, by presetting
Prism structure in included angle between first side and second side and deviation angle is capable of determining that third side every time
Angle between angle between face and first side and third side and second side.
Such as: the refractive index n of light conducting plate body1=1.58, the refractive index n of optical path control layer2=1.34, air refraction
n0=1 and prism site in angle β=5 ° between inclined-plane and the light-emitting surface of light conducting plate body, it can be deduced that: optical path control layer
Angle of total reflection λ between light conducting plate body1=arcsin (n2/n1Optical path control layer is injected from light conducting plate body in)=58 °
Angle between refracted light and the normal in the first face is α2=arcsin (n1×sin(λ1-β)/n2)=70.35 °, third side
Angle=70.35- θ between face and first side2；Again due to the deviation in order to accurately control light, each light is limited only
5-10 ° of deviation, it may thereby determine that out θ2Between 14.2-26.1 °, and then calculate between third side and first side
Angle can be 44.25-56.15 °, such as 50.2 ° of section central value.
Then specific to make in the first wheat flour of light conducting plate body at the pipeline control layer for each angle having calculated that
The mode of work can be with: the mold of the corresponding each angle of production, by the way that light-sensitive emulsion to be coated in (such as Fig. 5 a on the first face of light conducting plate body
It is shown), it may then pass through after mold is transferred on light-sensitive emulsion and makes light path control formable layer, by solid under ultraviolet irradiation
Change light-sensitive emulsion, to obtain optical path control layer (as shown in Figure 5 b).
The embodiment of the present invention also provides a kind of backlight module, including light guide plate as described above.
Backlight module provided by the invention can be side entrance back module, as shown in figure 13, connection light conducting plate body the
It is arranged on one side with the incidence surface of light-emitting surface towards light source.Since optical path control layer will in backlight module provided in an embodiment of the present invention
The light projected from the first face of light conducting plate body passes through deviation and reflexes to light-emitting surface injection, therefore backlight module can not make
With reflector plate, the cost of manufacture of backlight module is further decreased.
The embodiment of the invention also provides a kind of display devices, including backlight module as described above.
Display device can be display, mobile phone, tablet computer, television set, wearable electronic, navigation display equipment
Deng.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (10)
1. a kind of light guide plate characterized by comprising
Light conducting plate body；
Optical path control layer is formed in the first face of the light conducting plate body, for injecting the light to from the light conducting plate body
The light of circuit control layer carries out deviation, so that from the angle between the light and normal that the light-emitting surface of the light conducting plate body projects
Less than default peep-proof angle, wherein first face is the face opposite with the light-emitting surface, the refractive index of the optical path control layer
Lower than the refractive index of the light conducting plate body.
2. light guide plate according to claim 1, which is characterized in that the optical path control layer includes:
Flat part, the flat part cover the first face of the light conducting plate body；
Lug boss, from the flat part away from the one side protrusion of the light conducting plate body, for changing the propagation angle of light, and
The light-emitting surface that light reflexes to the light conducting plate body is projected.
3. light guide plate according to claim 2, which is characterized in that the lug boss includes multiple prism structures, each rib
Rod structure includes end to end first side, second side and third side, and the first side and the flat part connect
It connects and the first side of two neighboring prism structure is connected with each other；The second side is plane, and light is in the second side
Upper to reflect, light occurs to reflect or be reflected on the third side.
4. light guide plate according to claim 3, which is characterized in that the third side is plane or curved surface.
5. the light guide plate according to any one of claim 3 or 4, which is characterized in that the first side of the prism structure
Angle between second side is greater than 70 ° and less than 90 °.
6. light guide plate according to claim 1, which is characterized in that the optical path control layer is made by light-sensitive emulsion.
7. light guide plate according to claim 3, which is characterized in that further include the light-emitting surface for being formed in the light conducting plate body
On prism site, the prism site includes inclined-plane, the inclined-plane away from the light conducting plate body side be arranged.
8. a kind of backlight module, which is characterized in that including the light guide plate as described in any one of claims 1 to 7.
9. a kind of display device, which is characterized in that including backlight module as claimed in claim 8.
10. a kind of production method of light guide plate, which is characterized in that for making such as the light guide plate in claim 7, the method
Include:
According to inclined-plane in the refractive index of the light conducting plate body, the refractive index of the optical path control layer and the prism site with
Angle between the light-emitting surface of the light conducting plate body determines first side described in the prism structure, the second side
The mutual angle with the third side；
According to first side described in the prism structure, the mutual angle of the second side and the third side,
The optical path control layer is made on the first face of the light conducting plate body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001542.3A CN109521515A (en) | 2019-01-02 | 2019-01-02 | Light guide plate and preparation method thereof, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001542.3A CN109521515A (en) | 2019-01-02 | 2019-01-02 | Light guide plate and preparation method thereof, backlight module and display device |
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| CN109521515A true CN109521515A (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910001542.3A Pending CN109521515A (en) | 2019-01-02 | 2019-01-02 | Light guide plate and preparation method thereof, backlight module and display device |
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| CN112965228A (en) * | 2021-03-19 | 2021-06-15 | 重庆京东方显示照明有限公司 | Peep-proof film, display panel and display device |
| CN114174904A (en) * | 2019-08-08 | 2022-03-11 | 本田技研工业株式会社 | Lighting device |
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