CN207094226U - Light guide plate, backlight module and display device - Google Patents
Light guide plate, backlight module and display device Download PDFInfo
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- CN207094226U CN207094226U CN201721095339.XU CN201721095339U CN207094226U CN 207094226 U CN207094226 U CN 207094226U CN 201721095339 U CN201721095339 U CN 201721095339U CN 207094226 U CN207094226 U CN 207094226U
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- guide plate
- light guide
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Abstract
The utility model provides a kind of light guide plate, backlight module and display device, and the light guide plate includes transparent base, and the transparent base includes incidence surface and the exiting surface opposite with the incidence surface；The first lens arrangement of the light even light mixing on goal-selling face that the light source that the incidence surface side is set can be sent is provided with the incidence surface.Light guide plate, backlight module and display device of the present utility model can cause backlight module light to be evenly distributed, and avoid the occurrence of bad, improve the taste of display device picture, reduce backlight module cost, shorten the light mixing distance of light source, ensure backlight module thickness requirement.
Description
Technical field
It the utility model is related to display technology field, more particularly to a kind of light guide plate, backlight module and display device.
Background technology
Car-mounted display backlight module is mostly side entrance back module at present, the market highlighted with car-mounted display backlight module
Trend, this, which results in side entering type car-mounted display backlight module, needs great power LED, can meet brightness requirement, with LED numbers
Increase, power increase, LED light bar (Lightbar) section temperature is too high to turn into the bottleneck for restricting car-mounted display backlight module.
In the design of direct type backlighting system, most important purpose is exactly to realize the brightness uniformity point of system over short
Cloth, at present down straight aphototropism mode set diffuser plate, the light of down straight aphototropism mode set light-emitting area are directly typically placed above LED array
Learn taste mainly to be determined to the distance of diffuser plate by LED array and LED light-emitting areas, as the vehicle-mounted backlight module of straight-down negative highlights
The development trend of degree, it is desirable to which single LEDs power increase, but the thickness of backlight module is constant, this, which is resulted in, traditional only depends on LED
There is optical profile inequality in the down straight aphototropism mode set picture of arrangement mode, bright blanking bar, bright blackening occurs, ultimately results in backlight mould
A series of paintings face taste client is difficult to receive.
Utility model content
The purpose of this utility model is to provide a kind of light guide plate, backlight module and display device, can cause backlight mould
Group light is evenly distributed, and avoids the occurrence of bad, improves the taste of display device picture, reduces backlight module cost, shorten light source
Light mixing distance, ensure backlight module thickness requirement.
Technical scheme provided by the utility model is as follows：
A kind of light guide plate, including transparent base, the transparent base include incidence surface and opposite with the incidence surface gone out
Smooth surface；The light that the light source that the incidence surface side is set can be sent is provided with the incidence surface in goal-selling
First lens arrangement of even light mixing on face.
Further, first lens arrangement includes the multiple curved cavities being distributed on the incidence surface, described more
Individual curved cavity is in matrix distribution.
Further, the curved cavity is the curved surface cavity with default curve form, the default curve form
The circular light spot that curved surface cavity can make to be emitted on the incidence surface from the light source, section is rounded is converted into described pre-
If the square focus spot that the section in target face is square.
Further, be additionally provided with the incidence surface with the integrally formed transparent support structure of the transparent base,
The transparent support structure is set around the surrounding of the incidence surface of the transparent base.
Further, the exiting surface be provided with the light being emitted from the exiting surface can be scattered second
Lens arrangement.
Further, second lens arrangement is reversed prism structure.
Further, it is additionally provided with substratum transparent on the second lens arrangement of the exiting surface；Wherein,
Multiple transparent particle minor structures are provided with the substratum transparent；And/or the light output surface of the substratum transparent has
Micro concavo-convex structure.
Further, first lens arrangement, second lens arrangement and the transparent base are formed in one knot
Structure.
A kind of backlight module, including light guide plate as described above；And it is arranged on the light of the incidence surface side of the light guide plate
Source.
A kind of display device, including backlight module as described above.
The beneficial effects of the utility model are as follows：
Such scheme, by setting the first lens arrangement on the incidence surface of light guide plate, light source can be carried out second
Luminous intensity distribution so that on goal-selling face light source can even light mixing, shorten the light mixing distance of light source, ensure that backlight module thickness will
While asking, ensure that backlight module light is evenly distributed, avoid the occurrence of bad, raising display device picture taste；Further, since
First lens arrangement can carry out second of luminous intensity distribution to light source, can increase the power of single light source, and reduce light source number
Amount, reach the purpose for reducing backlight module cost.
Brief description of the drawings
Fig. 1 represents the LED light source imaging schematic diagram of the light guide plate with ruled surface lens；
Fig. 2 represents the scope of uniform square hot spot and the image-forming principle schematic diagram of light source；
Fig. 3 represents LED light source spatial parameters schematic diagram；
Fig. 4 represents square focus spot region division schematic diagram；
Fig. 5 represents the schematic diagram of free-form surface lens model of first lens arrangement in LIGHTTOOLS softwares；
Fig. 6 represents the front view of the incidence surface of the light guide plate provided in the utility model embodiment；
Fig. 7 represents Fig. 6 left view.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
The accompanying drawing of type embodiment, the technical scheme of the utility model embodiment is clearly and completely described.Obviously, it is described
Embodiment is part of the embodiment of the present utility model, rather than whole embodiments.Based on described of the present utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained, belong to the scope that the utility model is protected.
The problem of Luminance Distribution is uneven in thinner thickness for down straight aphototropism mode set in the prior art, this practicality are new
Type provides a kind of light guide plate, backlight module and display device, and backlight module light can be caused to be evenly distributed, avoided the occurrence of not
It is good, the taste of display device picture is improved, reduces backlight module cost, shortens the light mixing distance of light source, ensures backlight module thickness
It is required that.
As shown in Figure 6 and Figure 7, the light guide plate that the utility model embodiment is provided includes a transparent base 100, described
Bright matrix 100 includes incidence surface and the exiting surface opposite with the incidence surface；Being provided with the incidence surface can be by described in
First lens arrangement 200 of light even light mixing on goal-selling face that the light source 10 that incidence surface side is set is sent.
Such scheme, by setting the first lens arrangement 200 on the incidence surface of light guide plate, the can be carried out to light source 10
Secondary light-distribution so that the even light mixing of light source 10 on goal-selling face, shorten the light mixing distance of light source 10, ensure that backlight module is thick
Degree requires that backlight module light is evenly distributed, and avoids the occurrence of bad, raising display device picture taste；Further, since described
One lens arrangement 200 can carry out second of luminous intensity distribution to light source 10, can increase the power of single light source 10, and reduce light source 10
Quantity, reach the purpose for reducing backlight module cost.
In embodiment provided by the utility model, as shown in Figure 6 and Figure 7, it is preferred that first lens arrangement
200 multiple curved cavities 210 including being distributed on the incidence surface；The multiple curved cavity 210 is in matrix distribution.
It is further preferred that the curved cavity 210 is the curved surface cavity with default curve form, the default curved surface
The curved surface cavity of shape can make from the light source 10 is emitted on the incidence surface, the circular light spot that section is rounded is converted into
Square focus spot on the goal-selling face, section is square.
Below to the curved surface cavity of first lens arrangement 200 in preferred embodiment provided by the utility model
Specific curve form is described in detail.
Designed in the specific curve form of the curved surface cavity to the first lens arrangement 200 before illustrating, to need first
To be said, generally, be adapted to the LED type number of side entrance back module typically according to the light guide plate of side entrance back module point
For 3014 and 4014, the LED light-emitting areas size of wherein model 3014 is 3.0 × 1.4 × 0.8mm, single LEDs forward current
For 30mA, voltage is between 2.8v between 3.6v, and luminous flux is between 9lm between 12lm；The LED light-emitting areas of model 4014
Size is 4.0 × 1.4 × 0.8mm, and single LEDs forward current is 60mA, voltage between 2.8v between 3.6v, luminous flux between
20lm is between 22lm.
In backlight module provided by the utility model, light guide plate can use PC materials, preferably use model
Light sources 10 of 2323 LED as down straight aphototropism mode set, wherein LED light-emitting areas size are 2.3 × 2.3 × 0.7mm, single
LED forward currents are 60mA, and voltage is between 2.8v between 3.3v, and luminous flux is between 22lm between 24lm.It is of course possible to manage
Solution, is not defined for the specifically chosen model of light source 10.
In the design of down straight aphototropism mode set, most important purpose is exactly to realize backlight module brightness over short
It is uniformly distributed, if being only to carry out free mixed light using a small amount of high power light source to be extremely difficult to final purpose, it is therefore desirable to
Addition can carry out the lens arrangement of divergence between light source and the incidence surface of light guide plate so that the light sent from light source
Being uniformly distributed for light intensity is realized on predeterminated target face, such as：In down straight aphototropism mode set, the predeterminated target face can be the back of the body
The one layer of optical thin film in blooming piece the top of the light-emitting area of optical mode group, i.e. backlight module, i.e. reflective polaroid (Dual
Brightness Enhancement Film, DBEF), so, to realize that the light source short distance mixed light of down straight aphototropism mode set is equal
Even final purpose is to design a divergence lens arrangement, then this divergence lens arrangement is compounded in into entering for light guide plate
In smooth surface, the light guide plate provided in the utility model embodiment may finally be obtained.
The optical emitting lens arrangement i.e. first lens arrangement 200, cavity in first lens arrangement 200
The predetermined curve form of structure 210, it can be obtained by the foundation of following free-form surface lens model.
Fig. 1 show the light guide plate imaging schematic diagram for setting well-regulated optical surface lens.
As shown in figure 1, it is theoretical according to traditional image optics, if the first lens arrangement is using ruled surface lens knot
Structure, by changing the parameter of ruled surface lens arrangement and with parameters such as electrical distances, down straight aphototropism mode set thickness 4mm with
When interior, it is impossible to the circular light spot a conversions of (i.e. in luminous energy propagation distance), cross section approximate circle shape will be emitted on the plane of incidence from light source
For the square focus spot that is square in goal-selling face (i.e. the light-emitting area of backlight module) upper section, (light source as shown in Figure 1 is sent
Light is still afterwards circular light spot b) in goal-selling face visible area through ruled surface lens arrangement, and this, which is resulted in only, has rule bent
The light guide plate of face lens, luminous energy is superimposed between circular light spot and circular light spot clear zone, Yi Jiyuan occur in goal-selling face
Dark space without photic-energy transfer between shape hot spot and circular light spot so that backlight module taste is difficult to be readily accepted by customers.
It is theoretical using nonimaging optics, according to the goal-selling face of backlight module in the utility model more than being based on
Intensity profile and require together and light source photic-energy transfer spatially, to design the free-form surface lens for transmitting luminous energy
(i.e. described first lens arrangement), is divided into uniform rectangular mesh, according to law of conservation of energy by goal-selling face so that pre-
If the roundness mess of the rectangular mesh and light source in target face is corresponded, corresponding formula for entrepreneurship is obtained, is passed through
The curvilinear coordinate value of free-form surface lens is calculated in the vector expression of alunite ear law, finally gives the first lens arrangement oneself
Light guide plate of the incidence surface with the first lens arrangement is obtained by toroidal lens model, and by modes such as injection moldings.
Using the free-form surface lens model of nonimaging optics Theoretical Design, and make and obtain with the first lens arrangement
Light guide plate, rule is set on light guide plate using traditional image optics theory applied in down straight aphototropism mode set, being compared to
Toroidal lens, there is stronger specific aim, the purpose for shortening the light guide plate optics correcting cycle can be reached.
Come to carry out further specifically the method for building up of the free-form surface lens model of the first lens arrangement 200 below
It is bright.
The foundation of free-form surface lens model is carried out using the direct method of nonimaging optics, primary condition is known luminaire
Luminosity and desired goal-selling face (i.e. the light-emitting area of backlight module) light distribution, then pass through free song
The design of the curve form of face lens model, by the light distribution in the goal-selling face of illumination to be achieved and the light of known luminaire
Distribution is matched.
On light guide plate using the design of nonimaging optics direct method, the free-form surface lens of first lens arrangement 200
Model be irregular toroidal lens model, it is necessary to light source is sheared, make a plane of refraction to light source and goal-selling face
Light wave carry out it is corresponding must match, make light source 10 specific light wavefront light and goal-selling face on light wave carry out one by one
Matching.
It should be noted that in field of backlights, the distance of goal-selling face and light source is generally shorter, typically with millimeter
Calculate, and in general illumination field, the distance of goal-selling face and light source is generally calculated in meters；Meanwhile in field of backlights,
Due to the limitation of light guide plate, the size of the first lens arrangement is small, and then different in general illumination field, in general illumination
Inside system, space be all it is bigger, therefore the size of the first lens arrangement compare it is larger.
In down straight aphototropism mode set, mainly need to realize the uniform square focus spot on goal-selling face, therefore
Consider for the number practical factor of light source in backlight module (such as LED), it is necessary to which square focus spot scope is designed fixed
In size range.During the free-form surface lens modelling of the first lens arrangement 200, because the light-emitting area of single LEDs
Can not be approximately spot light, it is necessary to which single led light-emitting area is divided into multiple light-emitting areas, one of area source compared to
First lens arrangement 200 can be approximated to be a light source.
Fig. 2 show the scope of uniform square focus spot and the schematic diagram of light source, and in fig. 2, L is uniform square focus spot
C length, W are uniform square focus spot c width, and H is light source 10 and the distance in goal-selling face, and D is the first lens arrangement
The diameter of curved cavity 210, H in 2000For the height of curved cavity 210.
The scope of uniform square focus spot c in backlight module is determined and the superiors of light source and backlight module
After the distance H (i.e. light source and the distance H in goal-selling face) of brightness enhancement film, it is possible to carried out freely according to nonimaging optics principle
The design of toroidal lens model.
First, the coordinate system that any one LED area light source 10 ' after decile is origin is selected, as shown in figure 3, with selected
Origin angularly divided, α is the angle of light source 10 and X-axis in Fig. 3, and β is the angle of light source 10 and Z axis.From Fig. 3
From the point of view of schematic diagram, the distance between light source 10 and goal-selling face are H, and the square focus spot c of required realization lighting area is L
× W, taking the first quartile of square focus spot c illuminated areas, then its long side and short side divide in the length of first quartile as research object
Not Wei L/2 and W/2, the total light flux of light source 10 is Φ, and the average illumination of the illumination region in goal-selling face is Ev(define herein
For the total light flux of light source 10 divided by the illumination region area in designed goal-selling face), the central light strength of LED light source 10 is IO=
φ/π。
As shown in figure 4, goal-selling illumination region to be achieved is divided into M parts in the direction of the x axis, along the y-axis direction etc.
It is divided into N parts, it can thus be concluded that to x (M) and y (N) array, so, will be drawn in the first quartile of goal-selling face illumination region
It divide into M × N rectangular mesh.By the energy of each corresponding grid of numerical computations, i.e., the LED light source 10 after decile
Emergent ray angle be discretization angle, corresponding to goal-selling face illumination region first quartile division, on α angles point
Into M parts, N parts are divided on β angles.
Then, by the α angles and β angles of conservation of energy computation partition, following formula can be obtained according to the conservation of energy：
The iterative relation formula that can be drawn by formula (1), a series of α values can be obtained by being calculated by iterative cycles.With pre-
If for each rectangular mesh of target face illumination region as research object, the area of rectangular mesh is ds=i × j, derives β number
Group.
Formula (2) is for each light extraction region on the free-form surface lens model of the first designed lens arrangement 200 and in advance
If the energy conservation relation in target face between grid.
Finally, the discrete coordinates of free-form surface lens model are calculated：
By the law of refraction and the normal vector of each point on the curved surface for obtaining free-form surface lens model, asked using this normal vector
Section is obtained, by asking the intersection point in section and incident ray to obtain the coordinate put on curve, by asking section and incident light
The intersection point of line obtains the coordinate put on curve.
Described law of refraction formula is as follows：
In above-mentioned formula (3), n represents the Refractive Index of Material of the first lens arrangement 200,The first lens are incided in expression
The ray vectors on the surface of structure 200,The ray vectors being emitted from the surface of the first lens arrangement 200 are represented,Represent into
The normal vector of exit point.
The unit vector of incident ray can be determined by beam projecting angle, by set initial point coordinate value and with
The unit vector of its corresponding emergent ray, the normal vector of initial point can be obtained, all hairs may finally be obtained by that analogy
Smooth surface corresponds to the coordinate value on curved surface.
Finally, all point coordinates values that will be calculated, imported into modeling software, can by linear interpolation be fitted or
Person samples interpolation, obtains the final free-form surface lens model for producing uniform square hot spot c.
Preferably, the distance between light source 10 and goal-selling face are 30mm, the square focus spot c illuminated areas of required realization
Product is 38.75mm × 25mm, by the way that the curved surface coordinate value of free-form surface lens model is calculated, then, by what is calculated
Coordinate value is imported in three-dimensional software PRO-E, and final free-form surface lens model is obtained by surface fitting, finally by obtained by
Free-form surface lens model imported into modeling and simulating in optical simulation software Lighttools.Figure is to be obtained after being fitted by software
To free-form surface lens model of first lens arrangement 200 in optical simulation software schematic diagram.
The material of first lens arrangement 200 uses PC materials, refractive index 1.58, the area of light source 10 be 2.3mm ×
2.3mm, luminous flux 24lm, receiving plane are 38.5mm × 28.5mm, are 30mm apart from light source 10, emulate 200,000 light numbers
According to Illumination Distribution figure of the single LEDs light source 10 for emulating to obtain through the first lens arrangement 200 in goal-selling face, it is known that, light
It is 40mm that line, which concentrates on design length, and width is in 30mm rectangular area, reaches expected design object, the efficiency of light energy utilization is
87%.
In addition, by taking 12.3 inches of down straight aphototropism mode sets as an example, the efficient lighting area for calculating light source 10 is 113.7mm
× 305.8mm, among software simulation, establishing the incidence surface of light guide plate has 120mm × 310mm reception light region, each LED
Uniformly arranged with each curved cavity 210 in the first lens arrangement 200 of light guide plate, the incidence surface of LED light-emitting areas and light guide plate it
Between distance be 30mm, after theoretical calculation and Multi simulation running, it is determined that spacing between each curved cavity 210 for 15mm ×
38.75mm arrangement mode, optimum efficiency can be reached.
In addition, in preferred embodiment provided by the utility model, as shown in fig. 6, being also set up on the incidence surface
Have and surround described transparent with the integrally formed transparent support structure 110 of the transparent base 100, the transparent support structure 110
The surrounding of the incidence surface of matrix 100 is set.
, can be by modes such as injection moldings in the incidence surface of light guide plate using such scheme, and form the saturating of hollow
Bright supporting construction 110, and the height of the transparent support structure 110 is equal to the height of LED in light source 10, can prevent from damaging LED by pressure.
In addition, in preferred embodiment provided by the utility model, as shown in fig. 7, being also set up on the exiting surface
There is substratum transparent 120；Wherein, the light output surface of the substratum transparent 120 has micro concavo-convex structure.
Using such scheme, by obtaining substratum transparent by being coated with the modes such as imprinting moulding on the exiting surface of light guide plate
120, the substratum transparent 120 can be organic silica gel, and cause the light output surface design micro concavo-convex structure of substratum transparent 120, excellent
Choosing, the light output surface of the substratum transparent 120 is designed as bark shape micro concavo-convex structure, the tree that light passes through the substratum transparent 120
After skin shape micro concavo-convex structure, according to according to snell law, increase scattering angle, reach the work of lifting light guide plate atomizing effect
With lifting the exiting surface luminous energy uniformity of light guide plate.
In preferred embodiment provided by the utility model, it can also be provided with the substratum transparent 120 multiple
Bright particulate minor structure.
Using such scheme, by the doping transparent particulate minor structure in substratum transparent 120, lifting exiting surface can be played
The purpose of luminous energy uniformity.
In addition, in preferred embodiment provided by the utility model, as shown in fig. 7, being provided with energy in the exiting surface
Enough the second lens arrangements 300 being scattered to the light being emitted from the exiting surface.Preferably, second lens arrangement
300 be reversed prism structure.
Using such scheme, by setting the second lens arrangement 300 on the exiting surface of light guide plate, light can be led to
After crossing the bark shape micro concavo-convex structure of the substratum transparent 120 of light guide plate exiting surface, the light that the exiting surface of light guide plate is emitted is entered
One step scatters, to have the function that to lift light guide plate atomizing effect.
In preferred embodiment provided by the utility model, first lens arrangement 200, second lens arrangement
300 are formed in one structure with the transparent base 100.
Using such scheme, the light guide plate can be integrally formed by injection molding.
It should be noted that the light guide plate that the utility model embodiment is provided is applied to various down straight aphototropism mode sets
In, be particularly suitable for use in require four sides without bright line, high brightness, thickness of thin down straight aphototropism mode set.
In addition, additionally providing a kind of backlight module in the utility model embodiment, including carried in the utility model embodiment
The light guide plate of confession；And it is arranged on the multiple light sources 10 of the incidence surface side of the light guide plate.
In addition, a kind of display device is additionally provided in the utility model embodiment, including backlight module as described above.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and replacement can also be made, these change
Enter and replace and also should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of light guide plate, including transparent base, the transparent base includes incidence surface and the light extraction opposite with the incidence surface
Face；Characterized in that, the light that the light source that the incidence surface side is set can be sent is provided with the incidence surface
The first lens arrangement of even light mixing on goal-selling face.
2. light guide plate according to claim 1, it is characterised in that first lens arrangement include being distributed in it is described enter light
Multiple curved cavities on face, the multiple curved cavity are in matrix distribution.
3. light guide plate according to claim 2, it is characterised in that
The curved cavity is the curved surface cavity with default curve form, and the curved surface cavity of the default curve form can make
It is emitted to from the light source on the incidence surface, the circular light spot that section is rounded is converted into cutting on the goal-selling face
The square focus spot that face is square.
4. light guide plate according to claim 1, it is characterised in that
It is additionally provided with the incidence surface and the integrally formed transparent support structure of the transparent base, the transparent support knot
Structure is set around the surrounding of the incidence surface of the transparent base.
5. light guide plate according to claim 1, it is characterised in that
The second lens arrangement that can be scattered to the light being emitted from the exiting surface is provided with the exiting surface.
6. light guide plate according to claim 5, it is characterised in that
Second lens arrangement is reversed prism structure.
7. light guide plate according to claim 5, it is characterised in that
Substratum transparent is additionally provided with the second lens arrangement of the exiting surface；Wherein,
Multiple transparent particle minor structures are provided with the substratum transparent；And/or the light output surface of the substratum transparent has nick
Male structure.
8. light guide plate according to claim 6, it is characterised in that
First lens arrangement, second lens arrangement and the transparent base are formed in one structure.
9. a kind of backlight module, it is characterised in that including the light guide plate as described in any one of claim 1 to 8；And it is arranged on
The light source of the incidence surface side of the light guide plate.
10. a kind of display device, it is characterised in that including backlight module as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721095339.XU CN207094226U (en) | 2017-08-30 | 2017-08-30 | Light guide plate, backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721095339.XU CN207094226U (en) | 2017-08-30 | 2017-08-30 | Light guide plate, backlight module and display device |
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| CN207094226U true CN207094226U (en) | 2018-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493504A (en) * | 2019-08-29 | 2019-11-22 | Oppo广东移动通信有限公司 | Imaging sensor, imaging system and terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493504A (en) * | 2019-08-29 | 2019-11-22 | Oppo广东移动通信有限公司 | Imaging sensor, imaging system and terminal |
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