CN111638568A - Dynamic display film and preparation method thereof - Google Patents
Dynamic display film and preparation method thereof Download PDFInfo
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- CN111638568A CN111638568A CN202010489606.1A CN202010489606A CN111638568A CN 111638568 A CN111638568 A CN 111638568A CN 202010489606 A CN202010489606 A CN 202010489606A CN 111638568 A CN111638568 A CN 111638568A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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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
- G02B27/60—Systems using moiré fringes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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Abstract
The invention discloses a dynamic display film and a preparation method thereof, and relates to the technical field of naked eye visual dynamic display films. By the design of the invention, the amplification and naked eye visualization of the tiny figure can be realized, and the dynamic display film can not only realize the display modes of translation, floating and sinking, but also realize the rotational symmetry of the amplified figure, and can realize the circular motion and the radial motion along with the change of the visual angle, thereby having strong dynamic effect; the dynamic display film can be applied to anti-counterfeiting and decorative materials.
Description
Technical Field
The invention relates to the technical field of naked eye visible dynamic display films, in particular to a dynamic display film and a preparation method thereof.
Background
Moire (moire) is an interference phenomenon in which gratings with a certain period are superimposed together in a certain way. Amidror and colleagues have made a lot of studies on the Moire effect and formed a mature theory, and the most widely used at present is the Fourier analysis model of Moire. The moire pattern can be recognized by human eyes, and the purpose of hiding information can be realized through a certain design, so that the moire pattern is applied to cryptography and anti-counterfeiting.
In 2000, Desmedt combines the Moire theory and the visual password idea, and provides a specific Moire pattern construction algorithm. According to the method, two basic layers are generated according to the hidden information and the image information, and the hidden image can be displayed through superposition of the layers. In the year 2004, it was said that,
o-zRodri i guez etc. utilize periodic cosine grating to constitute the reference picture layer, carry out phase modulation according to the hidden image to the reference picture layer and obtain the deformation picture layer, whole process is realized through optical algorithm, in order to improve the definition that the figure shows after the stack, can carry out low pass filtering to it and handle, can carry out face identification with this method. In 2010, Ragulsiks et al also proposed hiding images in a ring moire background, which revealed hidden patterns when the reference and morphed layers were superimposed with a fixed symmetry point.
The moire patterns of the past are implemented by using a wire grid or a lattice as an infrastructure. Therefore, the anti-counterfeiting dynamic display film has the defects of large design limited range, complex design process and single pattern dynamic mode.
However, with the development of micro-nano processing technology, microlens arrays are gradually beginning to be applied to optical systems. Researchers give the moire fringe amplification principle of the micro-lens array to the micro-pattern, and on the basis, the relations among the micro-lens array structure parameters, the micro-pattern array moving speed, the moving direction and the amplification factor are found.
How to utilize the moire fringes of the micro-lens array to solve the technical problems of large design limit range, complex design process and single pattern dynamic mode of the existing anti-counterfeiting dynamic display film becomes the direction of efforts of technicians in the field.
Disclosure of Invention
The invention aims to: in order to solve the above technical problems, the present invention provides a dynamic display film.
The invention specifically adopts the following technical scheme for realizing the purpose:
a dynamic display film, characterized by: including basic layer and bottom and the display layer of setting on basic layer two sides, the display layer is microlens array or aperture array, and microlens array or aperture array arrange according to quadrangle or hexagon array, and the periodic interval T of microlens array or aperture array is 0.04 ~ 0.5mm, and the bottom is the little figure array layer, sets up a plurality of subunits on the bottom and forms little figure array layer, and the size of subunit is less than periodic interval T.
The base layer is made of one of PE, PET or BOPP materials, the micro-pattern layer and the display layer are respectively arranged on two sides of the base layer through an electroforming master plate stamping method, and the thickness of the base layer is 0.03-0.3 mm.
The embossing aligns the display layer origin of coordinates with the micropattern layer origin of coordinates.
A method of making a dynamic display film comprising the steps of:
step 1, designing the unit arrangement mode of the display layer as r1＝r1(x, y); where r1 is the layout function, x is the abscissa in the cartesian coordinate system, and y is the ordinate.
Step 2, designing a micro-graphic subunit, wherein the size of the subunit is smaller than a period interval T;
and 3, copying the micro-graphic subunits to obtain a micro-graphic array layer, wherein the micro-graphic array layer is arranged in the same manner as the display layer, and r is2＝r1；
Step 4, carrying out coordinate weak change on the display layer, and setting a change function as g1＝g1(x, y) wherein g1As a function of the variation to the display layer; x is the abscissa; y is the ordinate; g1(x, y) indicates simultaneous changes to the horizontal and vertical coordinates. (ii) a
Step 5, carrying out coordinate weak transformation on the micro-graphic array layer, and setting a transformation function as g2＝g2(x,y)，g2As a function of variation to the micrographic layer; x is the abscissa; y is the ordinate; g2(x, y) represents simultaneous changes to the horizontal and vertical coordinates;
step 6, designing g in steps (4) and (5)1And g2The weak transformation function of (a) may be a linear transformation and a non-linear transformation:
f represents a function; x denotes the abscissa and y denotes the ordinate, representing the variation factor. The first formula is that the arrangement mode is zoomed; the second formula is that the arrangement mode is rotated; the third formula is that the arrangement mode is subjected to nonlinear geometric change to obtain annular arrangement;
step 7, the value in the weak change is 0 & lt 0.1, and the parameter controls the size of the graph obtained after amplification;
step 8, after the coordinate is weakly transformed, the final display layer and the basic layer graph are obtained in the arrangement mode of r1＝r1(g1x(x,y),g1y(x, y)) and r1＝r1(g2x(x,y),g2y(x,y))，r1Representing the arrangement mode; g1x(x, y) represents the change made to x, the abscissa; g1y(x, y) represents a change made to y, the ordinate; the subscripts x, y of g denote the horizontal and vertical coordinates, and the subscripts 1,2 denote the display layer and the graphic layer, respectively.
And filling ink in the groove of the micro-pattern layer to obtain a color dynamic pattern.
The invention has the following beneficial effects:
1. the invention provides a dynamic display mode after deeply researching the moire fringes of a micro lens array. Different from the existing dynamic graph, the design of the bottom layer micro-graph array can be realized through coordinate weak transformation, the design process is simpler and more convenient, and not only can the effect of graph translation be realized, but also the rotary motion and the radial motion of the graph around the circle center can be realized.
2. The visual perception of human eyes is enhanced, and on the other hand, the design of the artificial eye is technically difficult to imitate.
Drawings
FIG. 1 is a schematic diagram of a display layer structure according to the present invention.
FIG. 2 is a schematic view showing an arrangement of a micro graphic array according to the present invention before coordinate transformation;
FIG. 3 is a schematic diagram showing an arrangement of a micro graphic array according to the present invention after coordinate transformation;
fig. 4 is a display effect diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The display layer in this example is a microlens array with a period of 0.0729mm, arranged in a hexagonal pattern, as shown in figure 1.
The bottom layer unit pattern is √ shaped, the size of the sub-unit is 0.06mm, the sub-units are arranged in a hexagonal mode with the period of 0.0729mm, and the local structure is shown in fig. 2.
Weak transformation of coordinates of display layer
Coordinate weak transformation is carried out on the bottom layer
The resulting transformed micropattern array is partially shown in figure 3.
The dynamic display film was prepared as follows:
step 1, designing a required graphic array on a computer, and preparing a photoetching mask plate.
Step 2, spin-coating a photoresist on the glass substrate, wherein the photoresist is dripped to the center of the substrate until the photoresist area accounts for one fifth to one sixth of the area of the glass substrate, the photoresist is spread on the surface of the substrate by low-speed rotation, the low-speed rotation is 1000rad/min, the time is 10s, and finally the expected film-forming thickness is achieved by high-speed spin-coating, the high-speed rotation is 2000rad/min, and the time is 25 s; since the rise of the formed microlens array in this embodiment is 0.015mm, the photoresist needs to be a viscous AZ9260 photoresist.
And 3, obtaining a micro-lens array and a micro-pattern array on the photoresist material by utilizing contact type static exposure, wherein the mask plate exposure time of the micro-lens array is 30s, and the mask plate exposure time of the micro-pattern array is 10 s.
And 4, developing the exposed graph, wherein the specific parameters of the developing process are that the volume ratio of the developing solution to water is 1: 2, the temperature is 24 ℃, and the time is 30 s; it should be noted that the microlens array is not the final formed microlens array but a cylinder, and the cylinder array needs to be converted into the desired microlens array by a subsequent process.
And 5, obtaining the microlens array by a photoresist hot melting method, and baking the photoresist cylindrical array obtained in the previous step on a hot plate for 30min at the temperature of 140 ℃.
And 6, preparing a micro-lens array and a nickel plate of the micro-graphic array. Since both the micro-pattern array and the micro-lens array of the photoresist material are fabricated on glass, which is not conducive to the next step of imprinting, it is necessary to transfer the photoresist material to a flexible nickel plate. And carrying out micro electroforming by using the micro lens array and the micro pattern array which are manufactured on the glass in the previous step as substrates so as to obtain a nickel plate with the surface shape complementary with the relief shapes of the micro lens and the micro pattern. The working mode of the electroforming power supply is a constant current mode, and the electroforming additive is surfactant sodium dodecyl sulfate. In addition, the current density has a significant influence on the roughness of the deposition profile, too high increases defects such as pores formed by hydrogen absorption reaction, too low extends the deposition time of electroforming, and the embodiment is performed at an average current density of 1A/dm2, and the surface roughness is far less than the visible wavelength.
And 7, respectively taking the micro-lens array obtained in the step 6 and the flexible nickel plate of the micro-pattern array as an imprinting master plate, imprinting the micro-lens array on the upper surface of the film by using rotating shaft ultraviolet curing imprinting, and imprinting the micro-pattern array on the lower surface. Before stamping, the two masters need to be aligned.
And 8, painting the surface of the film obtained in the step 7, on which the micro-pattern array is printed, in a blade coating mode. The resulting dynamic graphic display effect is schematically shown in fig. 4.
Claims (5)
1. A dynamic display film, characterized by: including basic layer and bottom and the display layer of setting on basic layer two sides, the display layer is microlens array or aperture array, and microlens array or aperture array arrange according to quadrangle or hexagon array, and the periodic interval T of microlens array or aperture array is 0.04 ~ 0.5mm, and the bottom is the little figure array layer, sets up a plurality of subunits on the bottom and forms little figure array layer, and the size of subunit is less than periodic interval T.
2. A dynamic display film as recited in claim 1, wherein: the base layer is made of one of PE, PET or BOPP materials, the micro-pattern layer and the display layer are respectively arranged on two sides of the base layer through an electroforming master plate stamping method, and the thickness of the base layer is 0.03-0.3 mm.
3. A method of making a dynamic display film according to claim 4, wherein: the embossing aligns the display layer origin of coordinates with the micropattern layer origin of coordinates.
4. A method of making a dynamic display film of claim 1, comprising the steps of:
step 1, designing the unit arrangement mode of the display layer as r1＝r1(x,y)；
Step 2, designing a micro-graphic subunit, wherein the size of the subunit is smaller than a period interval T;
step 3, copying the micro-graph sub-units to obtain the rows of the micro-graph array layerThe cloth pattern is the same as the display layer and is r2＝r1；
Step 4, carrying out coordinate weak change on the display layer, and setting a change function as g1＝g1(x,y)；
Step 5, carrying out coordinate weak transformation on the micro-graphic array layer, and setting a transformation function as g2＝g2(x,y)；
Step 6, designing g in steps (4) and (5)1And g2The weak transformation function of (a) may be a linear transformation and a non-linear transformation:
step 7, the value in the weak change is 0 & lt 0.1, and the parameter controls the size of the graph obtained after amplification;
step 8, after the coordinate is weakly transformed, the final display layer and the basic layer graph are obtained in the arrangement mode of r1＝r1(g1x(x,y),g1y(x, y)) and r1＝r1(g2x(x,y),g2y(x,y))。
5. A method of making a dynamic display film according to claim 4, wherein: and filling ink in the groove of the micro-pattern layer to obtain a color dynamic pattern.
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| CN202010489606.1A CN111638568A (en) | 2020-06-02 | 2020-06-02 | Dynamic display film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690439A (en) * | 2020-12-30 | 2022-07-01 | 昇印光电（昆山）股份有限公司 | Optical imaging film and preparation method thereof |
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| CN104191860A (en) * | 2014-08-27 | 2014-12-10 | 苏州大学 | Colored dynamic three-dimensional moire image thin film based on micro printing and preparation method thereof |
| CN204390618U (en) * | 2015-01-19 | 2015-06-10 | 深圳市深大极光科技有限公司 | Anti false film |
| CN104834029A (en) * | 2015-04-16 | 2015-08-12 | 上海天臣包装材料有限公司 | Double-sided imaging micro-optical device, and preparation method and application thereof |
| CN110865454A (en) * | 2019-12-02 | 2020-03-06 | 四川芯辰光微纳科技有限公司 | Multilayer color dynamic display anti-counterfeiting film and preparation method thereof |
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2020
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Patent Citations (5)
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| CN101850680A (en) * | 2010-05-24 | 2010-10-06 | 苏州苏大维格光电科技股份有限公司 | Safety film with dynamic three-dimensional effect |
| CN104191860A (en) * | 2014-08-27 | 2014-12-10 | 苏州大学 | Colored dynamic three-dimensional moire image thin film based on micro printing and preparation method thereof |
| CN204390618U (en) * | 2015-01-19 | 2015-06-10 | 深圳市深大极光科技有限公司 | Anti false film |
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| CN114690439A (en) * | 2020-12-30 | 2022-07-01 | 昇印光电（昆山）股份有限公司 | Optical imaging film and preparation method thereof |
| CN114690439B (en) * | 2020-12-30 | 2024-04-23 | 昇印光电（昆山）股份有限公司 | Optical imaging film and preparation method |
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