CN110703431B - Optimization method for microsphere structure of side-light type polygonal light guide plate - Google Patents
Optimization method for microsphere structure of side-light type polygonal light guide plate Download PDFInfo
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- CN110703431B CN110703431B CN201910858891.7A CN201910858891A CN110703431B CN 110703431 B CN110703431 B CN 110703431B CN 201910858891 A CN201910858891 A CN 201910858891A CN 110703431 B CN110703431 B CN 110703431B
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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
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
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- 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
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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
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a method for optimizing a microsphere structure of a side-light type polygonal light guide plate, which comprises the following steps: modeling, grouping structural parameters, selecting the structural parameters of one parameter group to obtain discrete values, randomly selecting single values for the rest parameter groups, obtaining the optimized value range of the structural parameters in the selected parameter group according to the light-emitting uniformity, selecting the other parameter group, selecting the discrete values for the structural parameters, randomly selecting single values for the rest parameter groups, taking the single values for the parameter groups in the optimized value range in the range, and repeating iteration to obtain the optimized value range of each structural parameter. The method has the advantages of small calculated amount and high optimization speed.
Description
Technical Field
The invention relates to a light guide plate structure optimization method, in particular to a side light type polygonal light guide plate microsphere structure optimization method.
Background
The development of liquid crystal display technology is becoming mature, and the liquid crystal display technology is very common in daily life. In recent years, wearable devices have become popular, and they are single in shape and do not have much difference in appearance from conventional watches. Due to the problems of uneven illumination of the polygonal backlight module and the like, the wearable device with the irregular shape is slow to develop. The edge-light type polygonal backlight module has more edges, and the illumination distribution at the included angle is not particularly ideal, so that the design is more difficult than that of the conventional rectangular backlight module. Because the edge illumination distribution of the light-emitting surface of the polygonal backlight module is uneven and the regional dimming of the side-in backlight module is difficult to realize, the utilization rate of the polygonal light guide plate is not high. The light guide plate design at the present stage is mainly based on the personal work experience of engineers, the light guide plate is designed by the engineers, the randomness of the distribution of the microstructures is not strong, the optimization and adjustment steps at the later stage are too many, the time cost is high, the waste of human resources is serious, the design of the polygonal light guide plate has higher requirements on the randomness of the distribution of the microstructures, and more time is needed for obtaining more uniform illumination distribution.
Disclosure of Invention
The invention aims to provide a side-light type polygonal light guide plate microsphere structure optimization method, which is used for quickly optimizing the microsphere structure parameters of a light guide plate to ensure that the illumination of the light emergent surface of the light guide plate is uniform.
The technical scheme of the invention is as follows: a method for optimizing a microsphere structure of a side-light type polygonal light guide plate comprises the following steps:
s1, establishing a light guide plate model by utilizing Lighttools software and establishing a surface light source irradiating the light guide plate at one side edge of the light guide plate, wherein the surface of the light emitting surface of the light guide plate model is provided with a plurality of spherical convex microstructures arranged in a matrix manner;
s2, selecting a plurality of structural parameters of the spherical convex microstructure, and classifying two different structural parameters into a parameter group, wherein the structural parameters are classified into a plurality of parameter groups;
s3, setting a value initial range for each structural parameter, selecting one parameter group from a plurality of parameter groups, taking a plurality of discrete values for two structural parameters in the selected parameter group in the respective value initial range, and taking any value for the structural parameter in the unselected parameter group in the respective value initial range;
s4, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S3, and when determining that the light-emitting uniformity is within a receivable range, receiving discrete values for each of the two structural parameters in the parameter set selected in step S3, and determining the value optimization range of the two structural parameters in the selected parameter set by using the minimum value and the maximum value in the receivable discrete values as interval endpoints;
s5, selecting a parameter group from parameter groups of which the value-taking optimization ranges of the structural parameters are not obtained, wherein two structural parameters in the selected parameter group take a plurality of discrete values in respective value-taking initial ranges, the structural parameters in the unselected parameter group take one value at will in the respective value-taking initial ranges, and the two structural parameters in the parameter group of which the value-taking optimization ranges of the structural parameters are obtained take one value at will in the respective value-taking optimization ranges;
s6, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S5, and when determining that the light-emitting uniformity is within a receivable range, receiving discrete values for each of the two structural parameters in the parameter set selected in step S5, and determining the value optimization range of the two structural parameters in the selected parameter set by using the minimum value and the maximum value in the receivable discrete values as interval endpoints;
s7, repeating the steps S5 and S6 until two structural parameters in all parameter groups obtain a value optimization range;
and S8, taking the value optimization range of each structural parameter as the value initial range of each structural parameter, repeating the steps S3 to S8 until the light emitting surface light emitting uniformity of the light guide plate is calculated to be within a receivable range by using the values of each structural parameter obtained in the step S3, and ending iteration to obtain the value of each structural parameter.
Preferably, the number of discrete values of each structural parameter in the parameter set selected in step S3 is not less than 15.
Preferably, the two structural parameters in the parameter group selected in step S3 have the same number of discrete values.
Preferably, in the step S3 and the step S5, values are taken at equal intervals when a plurality of discrete values are taken within the respective initial value ranges.
Preferably, in step S2, the plurality of structural parameters of the spherical convex microstructure include a microstructure radius, a microstructure convex height, an X axial distance, a Y axial distance, an X axial offset, and a Y axial offset.
Preferably, the microstructure radius and microstructure protrusion height constitute a first parameter set, the X-axis pitch and the Y-axis pitch constitute a second parameter set, and the X-axis offset and the Y-axis offset constitute a third parameter set.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the two structural parameters are taken as a parameter group, the two structural parameters in the parameter group are taken as optimization objects each time, the value optimization range of the structural parameters is searched and each parameter group is optimized circularly, the value optimization range of the structural parameters in each parameter group can be shortened rapidly, the value of the structural parameters is finally determined, the calculated amount can be reduced greatly, and the optimization processing time is shortened.
Drawings
Fig. 1 is a light-emitting uniformity chart obtained by primarily optimizing the value optimization range of the microstructure radius and the microstructure protrusion height in the embodiment of the present invention.
Fig. 2 is a light-emitting uniformity chart obtained by preliminarily optimizing the value optimization ranges of the X-axis distance and the Y-axis distance according to the embodiment of the present invention.
Fig. 3 is a light-emitting uniformity chart obtained by preliminarily optimizing the value optimization ranges of the X-axis offset and the Y-axis offset according to the embodiment of the present invention.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which would occur to persons skilled in the art upon reading the present specification and which are intended to be within the scope of the present invention as defined in the appended claims.
The optimization method of the microsphere structure of the side-light type polygonal light guide plate comprises the following steps:
s1, establishing a light guide plate model by utilizing Lighttools software, establishing a surface light source illuminating the light guide plate on one side edge of the light guide plate, and arranging a plurality of spherical convex microstructures in a matrix arrangement on the surface of the light emitting surface of the light guide plate model;
s2, the structural parameters of the spherical convex microstructure comprise microstructure radius, microstructure convex height, X axial distance, Y axial distance, X axial offset and Y axial offset, the microstructure radius and the microstructure convex height are a first parameter set, the X axial distance and the Y axial distance are a second parameter set, and the X axial offset and the Y axial offset are a third parameter set;
s3, setting the initial range of the microstructure radius as [ A1, A2]The initial range of the projection height of the microstructure is [ B1, B2 ]]And the initial range of the X axial distance is [ C1, C2 ]]Between the Y axisThe distance value initial range is [ D1, D2 ]]The X axial offset value is within the initial range of [ E1, E2 ]]And the initial range of the Y axial offset is [ F1, F2 ]]If the first parameter set is selected as the optimization object, the radius values of the microstructures may be arranged from small to large as a11,a12,a13,…,a1n,a1n∈[A1,A2]N is more than or equal to 15, and the microstructure protrusion heights can be arranged from small to large as b11,b12,b13,…,b1n,b1n∈[B1,B2]N is more than or equal to 15, the value of the X axial distance is C1, C1 belongs to [ C1, C2 ]]And the Y axial distance value is D1, D1 belongs to [ D1, D2 ]]And the X axial offset value is E1, E1E [ E1, E2 ]]And the Y axial offset value is F1, F1 belongs to [ F1, F2 ]]；
S4, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S3, and determining that the light-emitting uniformity is within the acceptable range, wherein the acceptable discrete values of the two structural parameters in the parameter set selected in step S3 are, for example, a1 represents the acceptable discrete value of the microstructure radius2,a13,a14,…a117The acceptable discrete value of the projection height of the microstructure is b15,b16,b17,…,b110The optimal range of the microstructure radius is [ a1 ]2,a117]The optimal range of the projection height of the microstructure is [ b1 ]5,b110]；
S5, selecting a parameter group from parameter groups of the value optimization range of the structure parameter which is not obtained, for example, selecting a second parameter group as an optimization object in a second parameter group and a third parameter group, and arranging the X axial distance values from small to large can be c11,c12,c13,…,c1n,c1n∈[C1,C2]N is more than or equal to 15, and the Y axial spacing values can be d1 from small to large1,d12,d13,…,d1n,d1n∈[D1,D2]N is not less than 15; any value of the structural parameter in the unselected parameter group is selected within the respective value initial range, the value of the X axial offset can still be e1, and the value of the Y axial offset can still be f 1; two structural parameters in the parameter group which has obtained the value optimization range of the structural parameters are in eachIf any value in the optimization range of the self value is taken, the value of the microstructure radius is a1, a1 belongs to [ a1 ]2,a117]The protruding height of the microstructure is b1, b 1E [ b1 ]5,b110]；
S6, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S5, and determining that the light-emitting uniformity is within a receivable range, where the two structural parameters in the parameter set selected in step S5 can be respectively received discrete values, for example, the receivable discrete value of the X axial distance is c110,c111,c113,…,c120And the receivable discrete value of the Y-axis spacing value is d18,d19,d110,…,d122Then the value optimization range of the X axial distance is [ c1 ]10,c120]The value optimization range of the Y axial distance is [ d1 ]8,d122]；
S7, repeating the steps S5 and S6 until two structural parameters in all parameter groups obtain a value optimization range; in the present embodiment, the structural parameters remaining in the third parameter set are optimized by the methods of steps S5 and S6, the microstructure radius is a1, the microstructure protrusion height is b1, the X axial distance is c2, and c2 e [ c1 ]10,c120]The value of the Y axial distance is d2, d2 epsilon [ d1 ]8,d122]The X-axis offset values are arranged from small to large e11,e12,e13,…,e1n,e1n∈[E1,E2]N is more than or equal to 15, and the values of the Y axial offset are arranged from small to large in an f1 mode1,f12,f13,…,f1n,f1n∈[F1,F2]N is more than or equal to 15, and the value optimization range of the obtained X axial offset is assumed to be [ e1 ]4,e120]The value of the Y axial offset is optimized within the range of [ f1 ]9,f114]；
S8, taking the value optimization range of each structural parameter as the value initial range of each structural parameter, namely the radius value initial range of the microstructure is [ a1 ]2,a117]The initial range of the projection height of the microstructure is [ b1 ]5,b110]Initial range of X axial distanceIs [ c1 ]10,c120]And the initial range of the Y axial distance is [ d1 ]8,d122]The X axial offset value has an initial range of [ e1 ]4,e120]The initial range of Y-axis offset is [ f1 ]9,f114]And repeating the steps S3 to S8 until the light-emitting surface light-emitting uniformity of the light guide plate is within a receivable range by calculating the values of the structural parameters obtained in the step S3, and ending the iteration to obtain the values of the structural parameters. For simplicity, assuming that an optimized structure is obtained by one optimization process, it should be the case that the radius of the microstructure can be a2 from small to large1,a22,a23,…,a2n,a2n∈[a12,a117]N is more than or equal to 15, and the microstructure protrusion heights can be arranged from small to large as b21,b22,b23,…,b2n,b2n∈[b15,b110]N is more than or equal to 15, the value of the X axial distance is c3, c3 belongs to [ c1 ]10,c120]And the Y axial distance value is d3, d3 epsilon [ d1 ]8,d122]The X axial offset value is e2, e 2E [ e1 ]4,e120]The Y-axis offset value is f2, f2 epsilon [ f1 ]9,f114]And if the light-emitting uniformity of the light-emitting surface of the light guide plate obtained by all value combination calculation is within a receivable range, the optimization is completed, and the final optimization result is that the microstructure radius value a2 belongs to [ a1 ]2,a117]The protruding height of the microstructure is b2 ∈ [ b1 ]5,b110]The initial range of the X axial distance is c3, and c3 belongs to [ c1 ]10,c120]The initial range of the Y axial distance is d3, d3 belongs to [ d1 ]8,d122]The initial range of the X axial offset is e2, e 2E [ e1 ]4,e120]The initial range of the Y axial offset is f2, f2 epsilon [ f 1)9,f114]。
In the following embodiment, a rectangular light guide plate with a size of 30mm × 26mm × 1.5mm is built in Lighttools software, the light emitting surface is the upper surface of the light guide plate, the light sources are placed in parallel on the long sides of the light guide plate, the far light ends are cut to form a hexagon, and a surface light source with a size of 30mm × 1.5mm and irradiating the light guide plate is built, wherein the light source power is 5W, and the light wavelength is 550 nm. Arranging a spherical convex microstructure on a light-emitting surface of the light guide plate, wherein the radius of the spherical convex microstructure is 0-1.5mm, the height of the convex microstructure is 0-1.5mm, the X axial distance is 2.3mm, the Y axial distance is 3.0mm, the X axial offset is 0.9mm, the Y axial offset is-1.0 mm, analyzing the light-emitting uniformity by using a function group MeshMF.MeshIlluminancegroup, obtaining the value optimization range of the radius of the microstructure of 0.55-1.01 mm and the value optimization range of the height of the convex microstructure of 0.40-1.07 mm in figure 1, then selecting the radius of the microstructure and the height of the convex microstructure, optimizing the X axial distance and the Y axial distance, obtaining the value optimization range of the X axial distance of 1.79-2.70 mm and the value optimization range of the Y axial distance of 2.60-3.58 mm in figure 2, and optimizing the X axial offset and the Y axial offset, obtaining the value optimization range of the X axial offset of 0.95-0.875 mm and the Y axial offset of 0.08-1.08 mm in figure 3mm, repeating the iteration for a plurality of times to obtain a final optimization result, wherein the radius of the microstructure is 0.844695mm, the projection height of the microstructure is 0.617066mm, the X axial distance is 2.32205mm, the Y axial distance is 3.06252mm, the X axial offset is 0.941239mm, and the Y axial offset is-1.00917 mm. The method determines the influence of the range change on the uniformity of the emergent light by the value of the structural parameters in different parameter sets, thereby accurately determining the optimization range and further reducing the range, enabling the optimization tool to work more purposefully and greatly improving the efficiency.
Claims (5)
1. A method for optimizing a microsphere structure of a side-light type polygonal light guide plate is characterized by comprising the following steps:
s1, establishing a light guide plate model by utilizing Lighttools software and establishing a surface light source irradiating the light guide plate at one side edge of the light guide plate, wherein the surface of the light emitting surface of the light guide plate model is provided with a plurality of spherical convex microstructures arranged in a matrix manner;
s2, selecting a plurality of structural parameters of the spherical convex microstructure, and classifying two different structural parameters into a parameter group, wherein the structural parameters are classified into a plurality of parameter groups; the plurality of structural parameters of the spherical convex microstructure comprise microstructure radius, microstructure convex height, X axial distance, Y axial distance, X axial offset and Y axial offset;
s3, setting a value initial range for each structural parameter, selecting one parameter group from a plurality of parameter groups, taking a plurality of discrete values for two structural parameters in the selected parameter group in the respective value initial range, and taking any value for the structural parameter in the unselected parameter group in the respective value initial range;
s4, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S3, and when determining that the light-emitting uniformity is within a receivable range, receiving discrete values for each of the two structural parameters in the parameter set selected in step S3, and determining the value optimization range of the two structural parameters in the selected parameter set by using the minimum value and the maximum value in the receivable discrete values as interval endpoints;
s5, selecting a parameter group from parameter groups of which the value-taking optimization ranges of the structural parameters are not obtained, wherein two structural parameters in the selected parameter group take a plurality of discrete values in respective value-taking initial ranges, the structural parameters in the unselected parameter group take one value at will in the respective value-taking initial ranges, and the two structural parameters in the parameter group of which the value-taking optimization ranges of the structural parameters are obtained take one value at will in the respective value-taking optimization ranges;
s6, calculating the light-emitting uniformity of the light-emitting surface of the light guide plate according to the values of the structural parameters obtained in step S5, and when determining that the light-emitting uniformity is within a receivable range, receiving discrete values for each of the two structural parameters in the parameter set selected in step S5, and determining the value optimization range of the two structural parameters in the selected parameter set by using the minimum value and the maximum value in the receivable discrete values as interval endpoints;
s7, repeating the steps S5 and S6 until two structural parameters in all parameter groups obtain a value optimization range;
and S8, taking the value optimization range of each structural parameter as the value initial range of each structural parameter, repeating the steps S3 to S8 until the light emitting surface light emitting uniformity of the light guide plate is calculated to be within a receivable range by using the values of each structural parameter obtained in the step S3, and ending iteration to obtain the value of each structural parameter.
2. The method for optimizing the microsphere structure of the edge-lit polygonal light guide plate of claim 1, wherein the number of discrete values of each structural parameter in the parameter set selected in step S3 is not less than 15.
3. The method for optimizing the microsphere structure of the edge-lit polygonal light guide plate of claim 1, wherein the two structural parameters in the parameter set selected in step S3 have the same number of discrete values.
4. The method for optimizing the microsphere structure of the edge-lit polygonal light guide plate according to claim 1, wherein the values in the steps S3 and S5 are taken at equal intervals when a plurality of discrete values are taken within the respective initial ranges of values.
5. The method of claim 1, wherein the microstructure radius and microstructure protrusion height form a first parameter set, the X-axis pitch and Y-axis pitch form a second parameter set, and the X-axis offset and Y-axis offset form a third parameter set.
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