CN108680987B - A kind of network point distribution design method for liquid crystal display light guide plate - Google Patents
A kind of network point distribution design method for liquid crystal display light guide plate Download PDFInfo
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- CN108680987B CN108680987B CN201810692366.8A CN201810692366A CN108680987B CN 108680987 B CN108680987 B CN 108680987B CN 201810692366 A CN201810692366 A CN 201810692366A CN 108680987 B CN108680987 B CN 108680987B
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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
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The present invention relates to a kind of network point distribution design methods for liquid crystal display light guide plate, first the Illumination Distribution value at calculating light guide plate lower surface arbitrary coordinate position；Followed by conservation of energy principle, mapping relations are established based on the differential to any one LED light source energy, then with the uniform illuminance of the light-emitting face of light guide plate；Using the energy conduction process for being output to outgoing uniform area light source from LED light source energy, the Converse solved light guide plate mesh point distribution for realizing the energy conduction process；The bottom surface illumination that light directing site radius and light source calculate point is finally established into functional relation, the position coordinates of customized network point distribution change the bottom surface illumination of exit surface by site radius size.The present invention obtains the distribution of light guide plate scattering netted dot by theoretical calculation, reduces the correcting number of net-pont design, cuts down development time and cost.
Description
Technical field
The present invention relates to LCD backlight mould group field, especially a kind of network point distribution for liquid crystal display light guide plate is designed
Method.
Background technique
Backlight module is the core of entire liquid crystal display systems, determine its uniformity, color saturation, gamut range,
The volume and cost of system.In real system, the specification of light guide plate is different with the variation of liquid crystal display type, purposes, for example,
For in the mobile phone of small size, the computer monitor and large-sized television set of middle size LED quantity and specification it is different,
This requires the design for targetedly carrying out light guide plate scattering netted dot array.Network point distribution theory calls stipple pattern is in not advise
Then arrange and can satisfy the filling rate distribution of arbitrary continuation.
Currently, more typical network point distribution theory have it is super be uniformly distributed theory, dynamic uniform theory, repulsion mitigation method,
Dynamic molecule process.These methods require that entire light guide plate is first divided into multiple zonules according to Luminance Distribution, according to site
The corresponding relationship of density and brightness value generates preliminary network point distribution model in each zonule.Then, respective reason is utilized
Intranet point in region is adjusted by method, clusters round phenomenon with eliminate site.Network point distribution relative to rule is theoretical, does not advise
Then network point distribution theory can be designed that the network point distribution with high scrambling, but such method is computationally intensive, difficult
Degree is big, and restricted due to the complexity of optical design and production and processing, generally requires during practical net-pont design
A variety of methods are used in mixed way, therefore the site formation speed of irregular network point distribution is slow, low efficiency, not easy to operate.
In the LCD backlight source of this patent research, light source mainly uses the LED light bar of Lambertian radiator, and light guide plate becomes
To slimming, narrow frame, scattering netted dot takes shape in bottom surface of light guide plate.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of network point distribution design method for liquid crystal display light guide plate,
The problems such as multi-method is used in mixed way, artificial experience degree of dependence is high during the traditional net-pont design of substitution, is obtained by theoretical calculation
The distribution of light guide plate scattering netted dot is obtained, the correcting number of net-pont design is reduced, cuts down development time and cost.
The present invention is realized using following scheme: a kind of network point distribution design method for liquid crystal display light guide plate, special
Sign is: the following steps are included:
Step S1: the Illumination Distribution value at the arbitrary coordinate position of light guide plate lower surface is calculated；
Step S2: utilize conservation of energy principle, based on the differential to any one LED light source energy, then with light guide plate
The uniform illuminance of light-emitting face establishes mapping relations；Uniform area light source is emitted using from being output to for LED light source energy
Energy conduction process, the Converse solved light guide plate mesh point distribution for realizing the energy conduction process；
Step S3: the bottom surface illumination that light directing site radius and light source calculate point is established into functional relation, customized site point
The position coordinates of cloth change the bottom surface illumination of exit surface by site radius size.
Wherein, which, which can be, is interrupted the strip-shaped light sources such as light source and CCFL made of multiple LED combinations, but not
It is limited to this.
Further, the step S1 specifically includes the following steps:
Step S11: the data information of array LED light source is collected and determines, according to the data information and LED of LED light source
The feature construction array LED light source of light source；
The data information of the array LED light source includes between the center between the specification of LED light source and number, each light source
Every, array both ends at a distance from light-guide edge, the dimensions of light guide plate；The feature of the LED light source includes LED light source
Space light distribution and positional relationship；
Step S12: energy binned is carried out under space coordinates to the light that goes out of LED light source, solves differential light source in leaded light
Result is integrated to obtain single LED light source in the conduction Energy distribution of bottom surface of light guide plate by the Energy distribution in board bottom face.
Further, step S12 specifically: it is calculated according to actual light source size and light guide plate incident side ratio, according to
It is secondary to utilize from point light source to linear light source again to the calculating process of area source, that is, by area source in the direction for being parallel to incidence surface
It goes up and is parallel on light-emitting surface direction and be allocated as countless sections of luminous linear light sources, then by linear light source on perpendicular to light-emitting surface direction
Be allocated as countless sections shine member, then the differential light source in both direction is integrated respectively, find out calculate point place generation it is total
Illumination.
Further, in step S12, differential light source is solved in the Energy distribution of bottom surface of light guide plate specifically: backlight module
In include n LED light source, in cartesian coordinate system, if i-th point light source coordinate is (0, yi, zi), arbitrary target points (x, y,
0) bottom surface illumination is multiple LED light sources in array to the illumination stack result of bottom surface of light guide plate；The number of array LED point light source
With position by designer's self-defining, INIt is light-emitting surface in the luminous intensity of normal direction, array point light source is with any point P's
Horizontal illumination relational expression is defined as follows:
Defining length is that each longitudinal light distribution characteristic of luminous member is I in the linear light source of Lθα=Iθ0Cos α, i.e. f (α)=
Cos α, lateral light distribution characteristic are Iθ0=I00Cos θ, wherein I00That indicate is the light intensity on vertical plane and horizontal plane intersection direction, α
Indicate the angle that emergent ray is in the plane perpendicular to linear light source long axis.Define C90Plane is to pass through linear light source optical axis
And by plane where linear light source long axis direction, i.e. horizontal plane；Define plane C0For by linear light source optical axis and perpendicular to
Plane where linear light source long axis direction, i.e. vertical plane.θ indicate simultaneously by the plane of linear light source long axis and emergent ray and
Horizontal plane C90Angled, Iθ0Indicate be by linear light source long axis direction and with it is into θ angle by the horizontal plane of long axis
Plane and vertical plane C0Intersection direction on light intensity, IθαIt indicates by linear light source long axis and emergent ray plane and level
Face C90Angle o, emergent ray with perpendicular to the light intensity on the plane of linear light source long axis direction at α angle；R is bottom surface of light guide plate
Point P is calculated to the shortest distance of linear light source, the coordinate at the both ends of linear light source is (0, yi1, z) and (0, yi2,z)；By angle
Information is converted under cartesian cartesian coordinate system, the illumination E ' that array linear light source generates at P pointhIt is defined as follows:
In formula, yijIndicate the y-coordinate value at i-th of light source both ends, the maximum value of j is 2, indicates the both ends of light source；
By practical LED light source infinitesimal, quadratic integral is carried out in the y and z directions, and array extension light source generates at P point
Illumination E "hIt is defined as follows:
In formula, θEntirelyIndicate angle of total reflection when light is propagated in dielectric material.
Preferably, the light distribution of the linear light source is indicated with the curve of light distribution in two planes.One plane
By the longitudinal axis (long axis) of linear light source, the curve of light distribution in this plane is known as longitudinal (horizontal plane or C90Face) light distribution
Curve；Another plane is vertical with linear light source long axis, the curve of light distribution in this plane be known as laterally (vertical plane or
C0) curve of light distribution.
Further, step S2 specifically includes the following steps:
Step S21: it is based on conservation of energy principle, it is assumed that there is no the energy consumptions such as additional absorbent, scattering, roots for optical system
According to obtained array LED light source data information, array LED light source is constructed to bottom surface of light guide plate Energy distribution；
Step S22: the Illumination Distribution situation and its mathematical notation form of light guide plate exit facet are defined, energy in light guide plate is improved
Measure the theoretical expression of conduction condition；
Step S23: Illumination Distribution and predefined light guide plate exit facet of the array LED light source to bottom surface of light guide plate are established
Mapping relations between Illumination Distribution obtain light guide plate mesh point array distribution and diameter by numerical solution；
Step S24: according to light guide plate mesh point array distribution and diameter, the light conducting plate structure mould with scattering netted dot is constructed
Type establishes guide-lighting Slab using optical simulation software, completes the selection and attribute setting of reflection diaphragm, generates scatternet dot matrix
Column, verify the optical property of backlight module.
Further, step S3 specifically: bottom surface of light guide plate is divided into the part n, it is uniform for defining light guide plate exit facet
Area source, the light ray energy that every partial dispersion goes out light guide plate is same certain value；If bottom surface of light guide plate is perpendicular in xoy plane
Illumination Distribution and scattering netted dot radius size inversely, by recursion obtain Illumination Distribution and the site half of bottom surface of light guide plate
The relationship of diameter are as follows:
In formula, CkThat indicate is the Illumination Distribution of bottom surface of light guide plate in kth part, rkCorresponding to scattering netted dot in kth part
Radius distribution, C1Indicate that light enters the initial illumination E of light guide platehDistribution, is uniquely determined by array LED light source.
Preferably, establishing light guide plate using optical simulation software in step S24, emulating and establish model can be used
The optical simulation softwares such as TracePro, Lighttools, but not limited to this.
Particularly, method proposed by the invention can be used for LCD backlight source light guide plate, can be also used for commonly shining
The application scenarios such as Mingguang City source light guide plate, lamp box light guide plate.
Compared with prior art, the invention has the following beneficial effects: the present invention is special in order to reach efficiency, uniformity, color
Property etc. multiple requestings, propose it is a kind of based on LED quantity, specification light guide plate scattering netted dot distribution design theoretical method, replace
The problems such as multi-method is used in mixed way during traditional net-pont design, artificial experience degree of dependence is high, is led by theoretical calculation
The distribution of tabula rasa scattering netted dot, reduces the correcting number of net-pont design, cuts down development time and cost.
Detailed description of the invention
Fig. 1 is the design flow diagram of light guide plate scattering netted dot array distribution in the embodiment of the present invention.
Fig. 2 is light guide plate point light source position view under cartesian coordinate system in the embodiment of the present invention.
Fig. 3 is the positional relationship in the embodiment of the present invention between LED light source and light guide plate.
Fig. 4 is light guide plate linear light source position view under cartesian coordinate system in the embodiment of the present invention.
Fig. 5 is the definition of space light distribution schematic diagram and two angle parameters in the embodiment of the present invention.
Fig. 6 is the positional relationship in the embodiment of the present invention between linear light source and light guide plate.
Fig. 7 is light guide plate expansion light source position view under cartesian coordinate system in the embodiment of the present invention.
Fig. 8 is expansion light source light angle schematic diagram in the embodiment of the present invention.
Fig. 9 is bottom surface of light guide plate piecemeal schematic diagram in the embodiment of the present invention.
Figure 10 is the light guide plate micro-scattering site radius distribution profile based on micro structure array design in the embodiment of the present invention
Curved surface.
Figure 11 be the embodiment of the present invention in the light guide plate system based on point light source target face Illumination Distribution.
Figure 12 be the embodiment of the present invention in the light guide plate system based on linear light source target face Illumination Distribution.
Figure 13 be the embodiment of the present invention in the light guide plate system based on expansion light source target face Illumination Distribution.
Figure 14 is that light directing site is neatly distributed and is interspersed schematic diagram in the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Figure 1 and Figure 2, a kind of network point distribution design side for liquid crystal display light guide plate is present embodiments provided
Method, it is characterised in that: the following steps are included:
Step S1: the Illumination Distribution value at the arbitrary coordinate position of light guide plate lower surface is calculated；
Step S2: utilize conservation of energy principle, based on the differential to any one LED light source energy, then with light guide plate
The uniform illuminance of light-emitting face establishes mapping relations；Uniform area light source is emitted using from being output to for LED light source energy
Energy conduction process, the Converse solved light guide plate mesh point distribution for realizing the energy conduction process；
Step S3: the bottom surface illumination that light directing site radius and light source calculate point is established into functional relation, customized site point
The position coordinates of cloth change the bottom surface illumination of exit surface by site radius size.
Wherein, which, which can be, is interrupted the strip-shaped light sources such as light source and CCFL made of multiple LED combinations, but not
It is limited to this.
Wherein, Fig. 2 is light guide plate point light source position view under cartesian coordinate system in the embodiment of the present invention.
In the present embodiment, the step S1 specifically includes the following steps:
Step S11: the data information of array LED light source is collected and determines, according to the data information and LED of LED light source
The feature construction array LED light source of light source；
The data information of the array LED light source includes between the center between the specification of LED light source and number, each light source
Every, array both ends at a distance from light-guide edge, the dimensions of light guide plate；The feature of the LED light source includes LED light source
Space light distribution and positional relationship；
Step S12: energy binned is carried out under space coordinates to the light that goes out of LED light source, solves differential light source in leaded light
Result is integrated to obtain single LED light source in the conduction Energy distribution of bottom surface of light guide plate by the Energy distribution in board bottom face.
In the present embodiment, step S12 specifically: counted according to actual light source size and light guide plate incident side ratio
It calculates, successively utilizes from point light source to linear light source again to the calculating process of area source, that is, area source is being parallel to incidence surface
It on direction and is parallel on light-emitting surface direction and is allocated as countless sections of luminous linear light sources, then will be linear on perpendicular to light-emitting surface direction
Light source is allocated as the countless sections of members that shine, and then integrates respectively to the differential light source in both direction, finds out and generates at calculating point
Total illumination.
In the present embodiment, in step S12, differential light source is solved in the Energy distribution of bottom surface of light guide plate specifically: backlight
It include n LED light source in mould group, in cartesian coordinate system, if i-th of point light source coordinate is (0, yi, zi), arbitrary target points
The bottom surface illumination of (x, y, 0) is multiple LED light sources in array to the illumination stack result of bottom surface of light guide plate；Array LED point light source
Number and position by designer's self-defining, INLuminous intensity for light-emitting surface in normal direction, array point light source and any
The horizontal illumination relational expression of one point P is defined as follows:
Defining length is that each longitudinal light distribution characteristic of luminous member is I in the linear light source of Lθα=Iθ0Cos α, i.e. f (α)=
Cos α, lateral light distribution characteristic are Iθ0=I00Cos θ, wherein I00That indicate is the light intensity on vertical plane and horizontal plane intersection direction, α
Indicate the angle that emergent ray is in the plane perpendicular to linear light source long axis.Define C90Plane is to pass through linear light source optical axis
And by plane where linear light source long axis direction, i.e. horizontal plane；θ indicates to pass through linear light source long axis and emergent ray simultaneously
Plane and horizontal plane C90Angulation, Iθ0Indicate be by linear light source long axis direction and with the level by long axis
Face plane into θ angle and vertical plane C0Intersection direction on light intensity, IθαIt indicates passing through linear light source long axis and outgoing simultaneously
The plane and horizontal plane C of light90Angle o, emergent ray with perpendicular to the light on the plane of linear light source long axis direction at α angle
By force；R is that bottom surface of light guide plate calculates point P to the shortest distance of linear light source, and the coordinate at the both ends of linear light source is (0, yi1, z) and
(0,yi2,z)；It converts angle information under cartesian cartesian coordinate system, the illumination E ' that array linear light source generates at P pointh
It is defined as follows:
In formula, yijIndicate the y-coordinate value at i-th of light source both ends, the maximum value of j is 2, indicates the both ends of light source；
By practical LED light source infinitesimal, quadratic integral is carried out in the y and z directions, and array extension light source generates at P point
Illumination E "hIt is defined as follows:
In formula, θEntirelyIndicate angle of total reflection when light is propagated in dielectric material.
Preferably, in the present embodiment, the curve of light distribution of the light distribution in two planes of the linear light source
It indicates.One plane by the longitudinal axis (long axis) of linear light source, the curve of light distribution in this plane be known as it is longitudinal (horizontal plane or
C90Face) curve of light distribution；Another plane is vertical with linear light source long axis, and the curve of light distribution in this plane is known as cross
To (vertical plane or C0) curve of light distribution.As shown in Figure 5.
In the present embodiment, step S2 specifically includes the following steps:
Step S21: it is based on conservation of energy principle, it is assumed that there is no the energy consumptions such as additional absorbent, scattering, roots for optical system
According to obtained array LED light source data information, array LED light source is constructed to bottom surface of light guide plate Energy distribution；
Step S22: the Illumination Distribution situation and its mathematical notation form of light guide plate exit facet are defined, energy in light guide plate is improved
Measure the theoretical expression of conduction condition；
Step S23: Illumination Distribution and predefined light guide plate exit facet of the array LED light source to bottom surface of light guide plate are established
Mapping relations between Illumination Distribution obtain light guide plate mesh point array distribution and diameter by numerical solution；
Step S24: according to light guide plate mesh point array distribution and diameter, the light conducting plate structure mould with scattering netted dot is constructed
Type establishes guide-lighting Slab using optical simulation software, completes the selection and attribute setting of reflection diaphragm, generates scatternet dot matrix
Column, verify the optical property of backlight module.
In the present embodiment, step S3 specifically: bottom surface of light guide plate is divided into the part n, defining light guide plate exit facet is
Uniform area light source, the light ray energy that every partial dispersion goes out light guide plate is same certain value；If bottom surface of light guide plate is perpendicular to xoy plane
On Illumination Distribution and scattering netted dot radius size inversely, the Illumination Distribution and net of bottom surface of light guide plate are obtained by recursion
The relationship of point radius are as follows:
In formula, CkThat indicate is the Illumination Distribution of bottom surface of light guide plate in kth part, rkCorresponding to scattering netted dot in kth part
Radius distribution, C1Indicate that light enters the initial illumination E of light guide platehDistribution, is uniquely determined by array LED light source.
Preferably, in the present embodiment, in step S24, establishing light guide plate using optical simulation software, emulating and establish mould
Type can use the optical simulation softwares such as TracePro, Lighttools, but not limited to this.
Particularly, the method that the present embodiment is proposed can be used for LCD backlight source light guide plate, can be also used for common
The application scenarios such as lighting source light guide plate, lamp box light guide plate.
Specifically, as shown in figure 3, angular relationship in the present embodiment analysis chart 3, α indicates incident ray and it is flat in xoz
The angle between projection on face, θiThen indicate that projection of the light of i-th of LED outgoing in xoz plane is in xoy plane
Angle.According to the optical characteristics of cosine radiator, with IθDirection luminous intensity I at α angleθαIt can be used to lower mathematic(al) representation to retouch
It states:
Iθα=Iθ×cosα；
It, can be by acquired two-dimensional surface position coordinates relationship application in perpendicular to xoy plane and the plane of OP point excessively
Wherein, then the generated normal direction illumination E of incident ray P point on being directed toward plane NnIt can be calculated with following formula:
It is not difficult to obtain light source illumination E caused by P point in the horizontal planehAre as follows:
According to the angular relationship in Fig. 3, the geometrical relationship of incident ray in a coordinate system meets following mathematic(al) representation:
Fig. 4 is light guide plate linear light source position view under cartesian coordinate system in the embodiment of the present invention.It is sat in Descartes
Under mark system, the number of array LED point light source and position can be final available by designer's self-defining, simultaneous above formula
The horizontal illumination E of array light source and any point PhRelational expression:
As shown in fig. 6, in cartesian coordinate system, the incident side of light guide plate is defined as to the yoz plane of rectangular coordinate system,
Linear light source is placed in practical LED light source center, any one member that shines is taken after the linear light source differentiation that length is L
Dy, as shining, member dy illumination caused by bottom surface of light guide plate meets inverse square law, then available dy is in P point place
The I of generationθ0Illumination E on directionnBetween relationship:
In formula, l refers to that the luminous member dy of linear light source is calculated between point P two o'clock at a distance from line with certain.It is entire linear
The I that light source generates at P pointθ0Illumination E on directionnIt can be integrated and be obtained by the illumination of luminescence unit:
Wherein, α1And α2Respectively indicate the line and I at linear light source both ends and P pointθ0Subtended angle caused by direction.Here fixed
The coordinate at the both ends of adopted linear light source is (0, yi1, z) and (0, yi2, z), i is equally used for difference and is located at incident side array difference position
The LED point light source at place is set, height of all linear light sources apart from bottom surface of light guide plate is consistent, then the z of all linear light sources is sat
It marks all equal.
The longitudinal light distribution characteristic for defining the member dy that each shines in linear light source is Iθα=Iθ0Cos α, i.e. f (α)=cos α, it is horizontal
It is I to light distribution characteristicθ0=I00Cos θ, wherein I00What is indicated is the light intensity on vertical plane and horizontal plane intersection direction.To longitudinally it match
Light characteristic substitutes into formula, can convert angle information to what single linear light source under cartesian cartesian coordinate system generated at P point
The function expression of illumination is summed according to integral, the illumination E ' that array linear light source generates at P pointhIt can be expressed as follows:
It is guide-lighting first by practical LED light source infinitesimal in order to enable analog simulation to obtain closer to actual Illumination Distribution
Expansion light source is being parallel to incidence surface and is being parallel to out by the analog case of illumination as shown in Fig. 7 and 8 when plate is not distributed site
Regard countless linear light source combinations on smooth surface direction as, the long axis direction of linear light source exists perpendicular to bottom surface of light guide plate xoy, infinitesimal dz
Illumination caused by bottom surface of light guide plate meets inverse square law, integral can obtain entire linear light source generated at P point it is vertical
In the illumination of bottom surface of light guide plate are as follows:
Assuming that longitudinal light distribution characteristic of each luminous infinitesimal is Iθα=Iθ0Cos α, i.e. f (α)=cos α, lateral light distribution are special
Property is Iθ0=I00Cos θ, wherein I00What is indicated is the light intensity on vertical plane and horizontal plane intersection direction.Define expansion light source two
The coordinate at end is (0, yi1,zi1) and (0, yi2,zi2), the available expansion light source of simultaneous formula generates vertical at calculating point P
In the illumination E " of bottom surface of light guide platehFunction expression:
As shown in figure 9, light guide plate is divided into the part n in bottom surface of light guide plate, to obtain uniformly in light guide plate exit facet
Area source, then it is same certain value that every partial dispersion, which goes out the light ray energy of light guide plate,.It can make following vacation to simplify mathematical model
If: bottom surface of light guide plate perpendicular in xoy plane Illumination Distribution and scattering netted dot radius size inversely, then different zones
The difference equation that the energy of site scattering meets can be described as:
Ckrk=Ck-1rk-1；
In formula, CkThat indicate is the Illumination Distribution of bottom surface of light guide plate in kth part, rkCorresponding to scattering netted dot in kth part
Radius distribution.Similarly, Ck-1And rk-1It is to be scattered in -1 part of the Illumination Distribution of bottom surface of light guide plate and kth in -1 part of kth respectively
Site radius distribution.The gained light ray energy of kth part be have already passed through -1 part of kth scattering netted dot scattering after obtain,
I.e. the light ray energy of kth part depends on reaching the light ray energy of -1 part of kth and by scattering netted dot scattering in -1 part of kth
Light ray energy, the then light ray energy for reaching kth part may be expressed as:
Ck=Ck-1(1-rk-1)；
By the iterative calculation of formula, the Illumination Distribution of bottom surface of light guide plate and the relationship of site radius can pass through following formula
Sub- recursion acquires:
In formula, C1Indicate that light enters the initial illumination E of light guide platehDistribution, is uniquely determined by array LED light source.To above formula
Merge similar terms final finishing and obtain following formula:
Following the present embodiment is poly- with a 120mm × 70mm × 2mm for founding U.S. methacrylate sheet Co., Ltd
Methyl methacrylate (Polymethylmethacrylate, PMMA) light guide plate is as design object, side entering type LED light source core
The luminous effective coverage of piece is 4mm × 1.4mm, and LED chip is with a thickness of 0.8mm.According to the parameter of product specification book, which can
To export the luminous flux of 25 lumens in 0.2 watt-hour of exemplary power.It rubs in view of being easy to generate by the site of neat matrix arrangement
Your striped influences uniformity, and in order to avoid the problem, the design scheme that the present embodiment uses dot location to be interspersed, Figure 14 is
(Figure 14 (a)) is neatly distributed for light directing site and (Figure 14 (the b)) schematic diagram that is interspersed.X_pitch expression is parallel to x-axis direction
Same straight line on the distance between adjacent two o'clock, be set as 1.14mm；Similarly, what Y_pitch was indicated is parallel to y-axis direction
Same straight line on the distance between adjacent two o'clock, be set as 2mm.
In the present embodiment, according to the derivation of point light source, 5.5 inches are available for by Matlab numerical solution
The radius distribution contour surface of the scattering netted dot of PMMA light guide plate, as shown in Figure 10.Figure 10 (a) is as can be seen that site radius is big
Small be distributed increases at a distance from light source with calculating point and is increased, since the Energy distribution of bottom surface of light guide plate is with calculating and light source
Distance increases and reduces, so dipped beam source region is designed as small site and passes light ray energy maximum probability to far from source region
It broadcasts, therefore, the radius distribution contour surface of scattering netted dot meets original design intention in Figure 10 (a).Figure 10 (b) is made with linear light source
For the radius distribution contour surface for the scattering netted dot that design light source obtains, the radius distribution of scattering netted dot considers LED light source and exists
The firefly effect that incident side generates, but site radius increases at a distance from light source with calculating point and reduces, distance light source region net
Point as low as several nanometers of radius value, this and do not meet design in site radius size changing rule.Figure 10 (c) is based on extension
The scattering netted dot radius distribution contour surface that light source design obtains, the characteristics of being integrated with point light source and linear light source, so that leading
The light situation that goes out of tabula rasa is more nearly actual conditions.The distribution situation of light guide plate mesh point is by LED light distribution characteristic and array distribution
Position determines that the size of entire light guide plate mesh point distributed areas is defined as 116mm × 66mm.According in design parameter to scatternet
The definition of point radius distribution will carry out discrete placement simultaneously to all dot locations using X_pitch and Y_pitch parameter first
The Illumination Distribution for calculating all dot locations solves scattering netted dot radius size value further according to the illumination of bottom surface of light guide plate, makes by oneself
Adopted scattering netted dot position promotes design freedom to advanced optimize.
It is constructed in optical simulation software TracePro including array LED light source, PMMA light guide plate, reflector plate, diffusion
Film, prism film.The light-emitting area of LED chip is 0.1mm at a distance from light guide plate incident side, has reserved certain interval for assembly,
It ensure that the compact of system simultaneously.Light guide plate and each diaphragm are modeled according to actual size, and scattering netted dot array is first written as
TracePro macrolanguage, then imported by Reptile attribute, the entire optical system modeling being finally completed.
Light guide plate mesh point distribution determines the back light system efficiency of light energy utilization and light-emitting uniformity, according to scattering netted dot array
Algorithmic derivation has obtained the contour surface of point light source --- linear light source --- network point distribution under the conditions of area source, and light source is defined
It for array point light source, is placed on the left of light guide plate, and enters light for long side, light-emitting surface is very uneven as seen from Figure 11, from entering
Light side obviously, has reached the peak value of illumination in the region farthest apart from light source to far from the enhancing of source region illumination, main former
Because being to there is very big difference to cause in light-emitting area and luminous intensity distribution due to point light source and actual LED chip.
International 9 methods of ANSI are used to the evaluation of light guide plate light-emitting surface uniformity.9 method tests of ANSI are uniform
The method of property is to take minimum value therein and most on the basis of measuring brightness value (Luminance) of the point 1-9 in target face
Big value is divided by obtain final uniformity, and according to the calculation method for illuminance uniformity, the system of the initialization design is being adopted
Illuminance uniformity when being simulated with practical LED chip is only 13.612%, capacity usage ratio 86.33%, is difficult to meet practical
The demand of light-emitting uniformity.
Light source is defined as array linear light source, is placed on the left of light guide plate, and enters light for long side, such as Figure 12 it can be seen that
Array linear light source distance light source region energy levels off to zero, and then there are a large amount of beam projectings in light guide plate dipped beam side.It is main former to analyze it
Because light guide plate close to sources area distribution site is much larger than distance light source region site radius, light passes through close to sources regions scatter
Afterwards, due to distance light source region light directing site radius very little, the probability that light is scattered is substantially reduced；Light guide plate two sides illumination is greatly then
It is since the reflector plate of two sides leads to light out, capacity usage ratio only has 76.66%, since distance light source region brightness value approaches
In zero, so uniformity can not be evaluated.
Figure 13 is to go out intensity of illumination distribution figure based on 5.5 inches of light guide plates of expansion light source, according to system emulation as a result, not examining
Consider the factors such as the energy loss of each optical diaphragm, the light efficiency of transmission of light guide plate has reached 90.9%.According to 9 methods of ANSI
The illuminance uniformity for calculating light guide plate is promoted to 89.89%, has reached the design object of light-emitting uniformity.In Figure 11, Figure 12
In, based on point light source design scheme cause out the non-uniform phenomenon of light be also extremely improved, avoid instant and near light source region
The excessive too small problem of domain site radius.The result shows that: when being scattered network point distribution design, array LED light source can not
Simple construction is the model of array point light source or array linear light source, and the site based on expansion light source is used on the basis of the two
Distribution can obtain design effectively, it was demonstrated that the correctness and practicability of the design method.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (6)
1. a kind of network point distribution design method for liquid crystal display light guide plate, it is characterised in that: the following steps are included:
Step S1: the Illumination Distribution value at the arbitrary coordinate position of light guide plate lower surface is calculated；
Step S2: conservation of energy principle is utilized, is gone out based on the differential to any one LED light source energy, then with the light of light guide plate
The uniform illuminance for penetrating face establishes mapping relations；Utilize the energy for being output to outgoing uniform area light source from LED light source energy
Conductive process, the Converse solved light guide plate mesh point distribution for realizing the energy conduction process；
Step S3: establishing functional relation for the bottom surface illumination that light directing site radius and light source calculate point, customized network point distribution
Position coordinates change the bottom surface illumination of exit surface by site radius size.
2. a kind of network point distribution design method for liquid crystal display light guide plate according to claim 1, it is characterised in that:
The step S1 specifically includes the following steps:
Step S11: the data information of array LED light source is collected and determines, according to the data information and LED light source of LED light source
Feature construction array LED light source；
The data information of the array LED light source include middle heart septum between the specification of LED light source and number, each light source,
Array both ends are at a distance from light-guide edge, the dimensions of light guide plate；The feature of the LED light source includes the sky of LED light source
Between light distribution and positional relationship；
Step S12: energy binned is carried out under space coordinates to the light that goes out of LED light source, solves differential light source at light guide plate bottom
Result is integrated to obtain single LED light source in the conduction Energy distribution of bottom surface of light guide plate by the Energy distribution in face.
3. a kind of network point distribution design method for liquid crystal display light guide plate according to claim 2, it is characterised in that:
Step S12 specifically: calculated, successively utilized from point light source to line according to actual light source size and light guide plate incident side ratio
Shape light source arrives the calculating process of area source again, that is, area source on the direction for be parallel to incidence surface and is parallel to light-emitting surface side
It is allocated as countless sections of luminous linear light sources upwards, then linear light source is allocated as the countless sections of members that shine on perpendicular to light-emitting surface direction,
Then the differential light source in both direction is integrated respectively, finds out the total illumination for calculating and generating at point.
4. a kind of network point distribution design method for liquid crystal display light guide plate according to claim 2, it is characterised in that:
In step S12, differential light source is solved in the Energy distribution of bottom surface of light guide plate specifically: it include n LED light source in backlight module,
In cartesian coordinate system, if i-th of point light source coordinate is (0, yi, zi), the bottom surface illumination of arbitrary target points (x, y, 0) is battle array
Illumination stack result of multiple LED light sources to bottom surface of light guide plate in column；The number of array LED point light source and position by designer from
Row definition, INLuminous intensity for light-emitting surface in normal direction, the horizontal illumination relational expression of array point light source and any point P
It is defined as follows:
Defining length is that each longitudinal light distribution characteristic of luminous member is I in the linear light source of Lθα=Iθ0Cos α, i.e. f (α)=cos α,
Lateral light distribution characteristic is Iθ0=I00Cos θ, wherein I00What is indicated is the light intensity on vertical plane and horizontal plane intersection direction, and α is indicated
The angle that emergent ray is in the plane perpendicular to linear light source long axis direction；Define plane C90To pass through linear light source optical axis
And by plane where linear light source long axis direction, i.e. horizontal plane；Define plane C0For by linear light source optical axis and perpendicular to
Plane where linear light source long axis direction, i.e. vertical plane；θ indicate simultaneously by the plane of linear light source long axis and emergent ray and
Horizontal plane C90Angulation, Iθ0Indicate be by linear light source long axis direction and with it is into θ angle by the horizontal plane of long axis
Plane and vertical plane C0Intersection direction on light intensity, IθαIt indicates simultaneously by the flat of linear light source long axis and emergent ray
Face and horizontal plane C90Into θ angle, emergent ray with perpendicular to the light intensity on the plane of linear light source long axis direction at α angle；R is to lead
Tabula rasa bottom surface calculates point P to the shortest distance of linear light source, and the coordinate at the both ends of linear light source is (0, yi1, z) and (0, yi2,
z)；It converts angle information under cartesian cartesian coordinate system, the illumination E ' that array linear light source generates at P pointhDefinition is such as
Under:
In formula, yijIndicate the y-coordinate value at i-th of light source both ends, the maximum value of j is 2, indicates the both ends of light source；
By practical LED light source infinitesimal, quadratic integral, the photograph that array extension light source generates at P point are carried out in the y and z directions
Spend E "hIt is defined as follows:
In formula, θEntirelyIndicate angle of total reflection when light is propagated in dielectric material.
5. a kind of network point distribution design method for liquid crystal display light guide plate according to claim 1, it is characterised in that:
Step S2 specifically includes the following steps:
Step S21: it is based on conservation of energy principle, it is assumed that optical system is there is no additional absorbent and is scattered in interior energy consumption,
According to obtained array LED light source data information, array LED light source is constructed to bottom surface of light guide plate Energy distribution；
Step S22: defining the Illumination Distribution situation and its mathematical notation form of light guide plate exit facet, improves light guide plate self-energy biography
Lead the theoretical expression of situation；
Step S23: array LED light source is established to the Illumination Distribution of bottom surface of light guide plate and the illumination of predefined light guide plate exit facet
Mapping relations between distribution obtain light guide plate mesh point array distribution and diameter by numerical solution；
Step S24: according to light guide plate mesh point array distribution and diameter, the light conducting plate structure model with scattering netted dot, benefit are constructed
Guide-lighting Slab is established with optical simulation software, the selection and attribute setting of reflection diaphragm is completed, generates scattering netted dot array, test
Demonstrate,prove the optical property of backlight module.
6. a kind of network point distribution design method for liquid crystal display light guide plate according to claim 1, it is characterised in that: step
Rapid S3 specifically: bottom surface of light guide plate is divided into the part n, definition light guide plate exit facet is uniform area light source, and every partial dispersion goes out
The light ray energy of light guide plate is same certain value；If bottom surface of light guide plate is perpendicular to the Illumination Distribution and scattering netted dot in xoy plane
Radius size inversely, the Illumination Distribution of bottom surface of light guide plate and the relationship of site radius is obtained by recursion are as follows:
In formula, CkThat indicate is the Illumination Distribution of bottom surface of light guide plate in kth part, rkCorresponding to scattering netted dot radius in kth part
Distribution, C1Indicate that light enters the initial illumination E of light guide platehDistribution, is uniquely determined by array LED light source.
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| CN110398801B (en) * | 2019-07-31 | 2020-09-04 | 江南大学 | Light guide plate scattering mesh point design method based on scattering efficiency |
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