阅读说明：本技术 一种动态显示膜及其制备方法 (Dynamic display film and preparation method thereof ) 是由 张艳 王杰芳 李�柱 于 2020-06-02 设计创作，主要内容包括：本发明公开了一种动态显示膜及其制备方法,涉及裸眼可视的动态显示膜技术领域,本发明包括基础层和设置在基础层两面的底层和显示层,显示层为微透镜阵列或者小孔阵列,微透镜阵列或者小孔阵列按照四边形或六边形阵列排布,微透镜阵列或者小孔阵列的周期间隔T为0.04～0.5mm,底层为微图形阵列层,底层上设置多个子单元形成微图形阵列层,子单元的大小小于周期间隔T。通过该发明的设计,能够实现微小图形的放大和裸眼可视,并且该动态显示膜不仅能实现平移、上浮、下沉的显示方式,能够实现放大图形的旋转对称分别,并能随这视角变化实现圆周运动和径向运动,具有强烈的动态效果；该动态显示膜可以运用在防伪和装饰材料中。(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.)

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(g_1x(x,y),g_1y(x, y)) and r₁＝r₁(g_2x(x,y),g_2y(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.

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(g_1x(x,y),g_1y(x, y)) and r₁＝r₁(g_2x(x,y),g_2y(x,y))，r₁Representing the arrangement mode; g_1x(x, y) represents the change made to x, the abscissa; g_1y(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.