Preparation method of patterned light guide plate

Abstract

The invention provides a preparation method of a patterned light guide plate. At least one group of microstructure array is formed on the patterned light guide plate and can be coupled with incident light in a target direction to display a target pattern; the preparation method comprises the steps of obtaining a target pattern; pixelating the target pattern, and dividing each pixel in the pixelated target pattern into a plurality of different pixel combinations; obtaining a microstructure template matched with each pixel combination, and matching a corresponding microstructure template for each pixel in the pixelated target pattern; and forming a microstructure array image-text according to the microstructure template of each pixel, and forming the at least one group of microstructure arrays on the light guide plate according to the microstructure array image-text. According to the preparation method, an original whole microstructure mask can be effectively segmented, so that when the direction or size of the microstructure needs to be changed, the change requirement of the microstructure is met by changing the corresponding microstructure template, and the preparation flexibility of the patterned light guide plate is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a method for preparing a patterned light guide plate. Background Art

[0002] A light guide plate is a key core component in a backlight module and can be used to provide a uniform surface light source. Generally, the light guide dots on the reflecting surface of the light guide plate are circular laser dots, and their arrangement is random. To obtain a uniform surface light source, there is a certain proportional relationship between the dot density and the distance from the light incident surface. If the dot arrangement on the reflecting surface of the light guide plate is in a specific array or a specific pattern arrangement, when light is incident on the area with dots, after the light is reflected or scattered by the light guide dots, it will directly exit from the light guide plate, making the area display a bright region; conversely, if the area where the light is incident has no dot arrangement, it will display a dark region. Thus, if the reflecting surface of the light guide plate is arranged with a specific pattern, the light coupled into the light guide plate will present a specific pattern display after passing through these specifically arranged dot patterns. Such a light guide plate can be called a patterned light guide plate. Patterned light guide plates, because they can display specific design patterns, can currently be applied to the light-facing panels of game consoles and other display scenarios and have certain advantages.

[0003] However, with the continuous progress of display technologies, consumers have higher and higher requirements for display effects. Currently, how to improve the display effects of patterned light guide plates, such as the brightness and uniformity of patterns, the ability to express details of patterns and the viewing angle, the gray-scale expression of patterns or how the gray scale of patterns smoothly transitions, and how to improve the transparency (transmittance) of patterned light guide plates, etc., have also become technical problems or development bottlenecks for patterned light guide plates used in displays. Sometimes, even for a single light guide plate, it is required to display two or more patterns. How to avoid the mutual interference between two or more patterns is also a technical problem that the industry urgently needs to solve.

[0004] After the microstructure of the existing light guide plate is specially designed, it can meet the requirements of the viewing angle and realize the display of different grayscale images, such as realizing the black-and-white or color display of any pattern, and at the same time, it can also improve the fineness and brightness uniformity of the pattern. However, the traditional microstructure of the light guide plate is formed by machining or mask exposure processing methods. Among them, the machining method has low processing efficiency, cannot process microstructures in multiple directions, different angles, and different sizes at one time, and has relatively high requirements for alignment accuracy, with a large process difficulty. The mask exposure processing method, although it requires pre-processing a gray-scale mask, also requires re-processing the mask when the direction or size of the microstructure needs to be changed, resulting in a long production cycle and high costs. Summary of the Invention

[0005] Based on this, the present invention aims to provide an improved method for preparing a patterned light guide plate to solve at least one of the above problems.

[0006] In a first aspect, the present application provides a method for preparing a patterned light guide plate, on which at least one group of microstructure arrays is formed, and the at least one group of microstructure arrays is configured to couple with incident light in a target direction to display a target pattern;

[0007] The method includes:

[0008] Obtain a target pattern;

[0009] Pixelize the target pattern, and divide each pixel in the pixelized target pattern into a plurality of different pixel combinations;

[0010] Obtain a microstructure template matching each pixel combination, and match a corresponding microstructure template for each pixel in the pixelized target pattern;

[0011] Form a microstructure array graphic according to the microstructure templates of each pixel, and form the at least one group of microstructure arrays on the light guide plate according to the microstructure array graphic.

[0012] In the above method for preparing a patterned light guide plate, by dividing each pixel in the pixelized target pattern into a plurality of different pixel combinations, obtaining a microstructure template matching each pixel combination, and matching a corresponding microstructure template for each pixel in the pixelized target pattern, an effective segmentation of the original monolithic microstructure mask is achieved. Furthermore, when it is necessary to change the direction or size of the microstructure, the corresponding microstructure template can be changed to meet the change requirements of the microstructure, without reprocessing a monolithic mask, greatly improving the flexibility of microstructure preparation, shortening the processing cycle, and reducing the preparation cost.

[0013] In one embodiment, the step of dividing each pixel in the pixelized target pattern into a plurality of different pixel combinations includes: obtaining the gray level of each pixel in the pixelized target pattern; dividing each pixel into a plurality of different pixel combinations according to the gray level of each pixel; wherein, different pixel combinations have different gray levels.

[0014] In one embodiment, the step of obtaining a microstructure template matching each pixel combination includes: determining a first structural parameter of the microstructure corresponding to each pixel combination according to the gray level of each pixel combination; wherein, the first structural parameter is configured to make the light-facing surface of the microstructure reflect a predetermined amount of incident light; preparing the microstructure template at least according to the first structural parameter of the microstructure.

[0015] In one embodiment, the patterned light guide plate has a pattern area corresponding to each pixel in the pixelated target pattern, and the microstructure is formed in the pattern area. The first structure parameter includes at least one of the following parameters: the area ratio of the orthographic projection of the microstructure on the pattern area to the pattern area; the length of the microstructure; the first angle between the light-facing surface of the microstructure and the target direction.

[0016] In one embodiment, the microstructure further has a second structure parameter, and the second structure parameter is configured to reflect the incident light in the target direction to the viewing range of the human eye by the light-facing surface of the microstructure. Wherein, the second structure parameter includes the second angle between the light-facing surface of the microstructure and the surface on which the microstructure is formed; preparing the microstructure template at least according to the first structure parameter of the microstructure includes: determining the second structure parameter of the microstructure; preparing the microstructure template at least according to the first structure parameter and the second structure parameter of the microstructure.

[0017] In one embodiment, there are at least two target patterns, and different target patterns are displayed by incident light in different target directions; at least two groups of microstructure arrays are formed on the patterned light guide plate. Wherein, the patterned light guide plate has a pattern area corresponding to each pixel in at least two pixelated target patterns, and at least two microstructures belonging to different microstructure arrays are formed in at least part of the pattern area.

[0018] In one embodiment, at least part of the microstructure further has a third structure parameter, and the third structure parameter is configured to reflect the incident light in other target directions to outside the viewing range of the human eye by the surface of the microstructure opposite to the light-facing surface. Wherein, the third structure parameter includes the third angle between the surface of the microstructure opposite to the light-facing surface and the surface on which the microstructure is formed; preparing the microstructure template at least according to the first structure parameter and the second structure parameter of the microstructure includes: determining the third structure parameter of the microstructure in each group of microstructure arrays; preparing the microstructure template according to the first structure parameter, the second structure parameter, and the third structure parameter of the microstructure.

[0019] In one embodiment, the third angle is greater than the second angle.

[0020] In one embodiment, forming the microstructure array graphic according to the microstructure template of each pixel includes: combining the microstructure templates of each pixel in each pixelated target pattern to form a microstructure array sub-graphic; combining each microstructure array sub-graphic to form the microstructure array graphic; using the microstructure array graphic to form the at least two groups of microstructure arrays on the light guide plate.

[0021] In one of the embodiments, the light-facing surface of the microstructure is any one of a trapezoidal plane, an arc surface, a combination of a plane and an arc surface; and, the value range of the side length of the pixels in the pixelated target pattern is 100 micrometers to 250 micrometers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0023] Figure 1 Shows a flowchart of the steps of an embodiment of the present application;

[0024] Figure 2 Shows target pattern 1 and target pattern 2 of an embodiment of the present application and the corresponding pixelated patterns;

[0025] Figure 3 Is a schematic diagram of the pixel combination in the pixelated target pattern of an embodiment of the present application;

[0026] Figure 4 Is a schematic diagram of the microstructure of target pattern 1 of an embodiment of the present application;

[0027] Figure 5 Is a schematic diagram of the microstructure of target pattern 2 of an embodiment of the present application;

[0028] Figure 6 Figure (a) of is a schematic diagram of the combination of target pattern 1 and target pattern 2 of an embodiment of the present application;

[0029] Figure 6 Figure (b) of is a schematic diagram of the microstructure array of the combined pattern of an embodiment of the present application;

[0030] Figure 7 Is a display schematic diagram of target pattern 1 and target pattern 2 of an embodiment of the present application;

[0031] Figure 8 Shows target pattern 3 and target pattern 4 of an embodiment of the present application;

[0032] Figure 9 Figure (a) of shows a schematic diagram of the microstructure array of target pattern 3 of an embodiment of the present application;

[0033] Figure 9 Figure (b) of shows a schematic diagram of the microstructure array of target pattern 4 of an embodiment of the present application;

[0034] Figure 10 (a) shows a schematic diagram of a microstructure array of a combined pattern of target pattern 3 and target pattern 4 according to an embodiment of the present application;

[0035] Figure 10 (b) of this application shows a display schematic diagram of target pattern 3 and target pattern 4 according to an embodiment of the present application;

[0036] Figure 11 shows a schematic diagram of the microstructure of target optically variable pattern 1 according to an embodiment of the present application;

[0037] Figure 12 shows a schematic diagram of the microstructure of target optically variable pattern 2 according to an embodiment of the present application;

[0038] Figure 13 (a) shows a schematic diagram of the structure of the microstructure according to an embodiment of the present application from a first perspective;

[0039] Figure 13 (b) shows a schematic diagram of the structure of the microstructure according to an embodiment of the present application from a second perspective;

[0040] Figure 14 shows a schematic diagram of the microstructure of a combined pattern of target optically variable pattern 1 and target optically variable pattern 2 according to an embodiment of the present application;

[0041] Figure 15 shows a schematic diagram of a microstructure array of a combined pattern of target optically variable pattern 1 and target optically variable pattern 2 according to an embodiment of the present application.

[0042] Element number description:

[0043] 100, patterned light guide plate, 110, microstructure array, 111, pattern area, 200, patterned light guide plate;

[0044] 10, microstructure, 11, light-facing surface, 12, surface opposite to the light-facing surface, 20, microstructure, 21, light-facing surface, 22, surface opposite to the light-facing surface, 30, microstructure, 311, pattern area, 40, microstructure, 411, pattern area. Detailed implementation manners

[0045] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0048] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only embodiments.

[0049] The embodiment of the present application provides a method for preparing a patterned light guide plate. After dividing the target pattern into a plurality of different pixel combinations, a corresponding microstructure template is determined for each pixel combination, and then a corresponding microstructure template is matched for each pixel in the target pattern to adapt to the variable structural parameters of the microstructure, while meeting the requirements of the viewing angle and display quality, greatly improving the flexibility of microstructure preparation and reducing the preparation cost.

[0050] As Figure 1 shown, the embodiment of the present application provides a method for preparing a patterned light guide plate.

[0051] Wherein, at least one group of microstructure arrays is formed on the patterned light guide plate, and the at least one group of microstructure arrays is configured to couple with the incident light in the target direction to display the target pattern.

[0052] Exemplarily, when there are multiple target patterns, different target patterns are displayed by the incident light in different target directions.

[0053] Exemplarily, the patterned light guide plate couples with incident light in one target direction each time to display a target pattern.

[0054] Exemplarily, the microstructure can be any one of an arc structure, a linear structure, a curved structure, and a grating structure. Among them, the grating structure can be used for the display of color patterns.

[0055] Exemplarily, the microstructures in the microstructure array can include a light-facing surface to couple with incident light in one target direction to provide the brightness required for displaying the corresponding target pattern; or can include multiple light-facing surfaces to respectively couple with incident light in different target directions to provide the brightness required for displaying the corresponding target pattern. For example, when the microstructure includes a first light-facing surface and a second light-facing surface, the first light-facing surface can couple with incident light in the first target direction to provide the brightness required for displaying the first target pattern corresponding to the first target direction, and the second light-facing surface can couple with incident light in the second target direction to provide the brightness required for displaying the second target pattern corresponding to the second target direction. Among them, after the incident light is incident on the light-facing surface, it can be reflected by the light-facing surface into the observation range of the human eye, and after the incident light is incident on the surface opposite to the light-facing surface, it can be reflected by this surface out of the observation range of the human eye. Optionally, the light-facing surface of the microstructure is any one of a trapezoidal plane, an arc surface, and a combination of a plane and an arc surface. Optionally, as Figure 4 shown, when the microstructure is an arc structure 10, it can include a light-facing surface 11 and a surface 12 opposite to the light-facing surface; optionally, as Figure 13 shown in Figure (a), when the microstructure is a linear structure 30, it can include a first light-facing surface ABED and a second light-facing surface ABC, and a surface ACFD opposite to the first light-facing surface ABED and a surface DEF opposite to the second light-facing surface ABC.

[0056] Furthermore, the above preparation method includes:

[0057] S100. Obtain a target pattern;

[0058] S200. Pixelize the target pattern and divide each pixel in the pixelized target pattern into multiple different pixel combinations;

[0059] Exemplarily, there can be multiple target patterns. As Figure 2 shown in Figures (a) and (b), when pixelizing the target pattern 1, Figure 2For figure (c), pixelating the target pattern 2 results in figure (d). Among them, in the pixelated target pattern, the size of each pixel can be determined based on the fineness of the pattern to be presented. Exemplarily, the value range of the side length of the pixel can be 100 microns to 250 microns. For example, it can be 100 microns, 120 microns, 140 microns, 160 microns, 180 microns, 200 microns, 220 microns, 250 microns, and can be specifically determined according to the display requirements of the pattern. By making the side length of the pixel meet the above range, the fineness of the pattern and the uniformity of brightness can be improved.

[0060] Exemplarily, the pixels in the target pattern are arranged according to a certain rule. For example, it can be at least one of orthogonal arrangement, staggered arrangement, and spaced arrangement.

[0061] Exemplarily, each pixel can be divided by the gray scale, type, and size of the pixel. For example, when dividing by gray scale, pixels with the same gray scale can be divided into a group according to the gray scale value, or pixels within a predetermined gray scale range can be divided into a group according to the gray scale range; for another example, when dividing by type, pixels of the same color (such as red / green / blue) can be divided into a group according to the displayed color; for another example, when dividing by size, pixels with the same length can be divided into a group according to the side length / diagonal length of the pixel.

[0062] S300. Obtain the microstructure template matching each pixel combination, and match the corresponding microstructure template for each pixel in the pixelated target pattern.

[0063] Exemplarily, a corresponding microstructure template can be matched for each divided pixel combination, so as to determine the required type of microstructure template. On the basis of determining the type of microstructure template, the corresponding microstructure template is matched for each pixel in the pixelated target pattern. This is beneficial for fine-tuning a large piece of microstructure mask template without the need to reprocess a new mask template, thus greatly facilitating the preparation of the microstructure mask template.

[0064] S400. Form a microstructure array pattern according to the microstructure template of each pixel, and form at least one group of microstructure arrays on the light guide plate according to the microstructure array pattern.

[0065] Exemplarily, the microstructure templates of each pixel can be combined into a microstructure array pattern, and the light guide plate is lithographed with the microstructure array pattern as a mask to finally form the corresponding microstructure array and obtain a patterned light guide plate.

[0066] The preparation method of the above-mentioned patterned light guide plate divides each pixel in the pixelated target pattern into a plurality of different pixel combinations, obtains a microstructure template matching each pixel combination, and matches a corresponding microstructure template to each pixel in the pixelated target pattern, thereby realizing the effective segmentation of the originally integral microstructure mask. Furthermore, when it is necessary to change the direction or size of the microstructure, the corresponding microstructure template can be changed to meet the requirements of the microstructure change, without reprocessing the entire mask, greatly improving the flexibility of the preparation of the patterned light guide plate, shortening the processing cycle, and reducing the preparation cost.

[0067] In some embodiments of the present application, step S200 may further include:

[0068] S210. Obtain the gray level of each pixel in the pixelated target pattern;

[0069] S220. Divide each pixel into a plurality of different pixel combinations according to the gray level of each pixel; wherein, different pixel combinations have different gray levels.

[0070] Exemplarily, as Figure 3 shown, the pixels with the first gray level in the target pattern 1 can be combined to form pixel combination 1, the pixels with the second gray level can be combined to form pixel combination 2, the pixels with the third gray level can be combined to form pixel combination 3, and the pixels with the fourth gray level can be combined to form pixel combination 4, where the first gray level, the second gray level, the third gray level, and the fourth gray level are all different, and so on, so as to divide the target pattern 1 into a plurality of different pixel combinations. Of course, the target pattern 2 can also be divided in the above manner to obtain a plurality of different pixel combinations, and different pixel combinations have different gray levels.

[0071] In some embodiments of the present application, when the microstructure is coupled with the incident light in the preset direction on its light-facing surface, the gray level of the corresponding pixel can be displayed, so step S300 may further include:

[0072] S310. Determine the first structural parameter of the microstructure corresponding to each pixel combination according to the gray level of each pixel combination; wherein, the first structural parameter is configured to make the light-facing surface of the microstructure reflect a predetermined amount of incident light;

[0073] S320. Prepare a microstructure template at least according to the first structural parameter of the microstructure.

[0074] Among them, the first structural parameter is configured to enable the microstructures to reflect a predetermined amount of incident light. Exemplarily, the first structural parameters such as the density (area ratio), length, and angle of the microstructures in different regions of the patterned light guide plate can all change the energy of the emitted light, thereby achieving different grayscale displays. Therefore, on the basis of determining the grayscale of each pixel combination, the first structural parameters such as the density (area ratio), length, and angle of the microstructures can be designed to display the corresponding grayscale when the microstructures are coupled with the incident light in the preset direction, and then the corresponding microstructure template can be prepared according to the determined first structural parameters.

[0075] Optionally, the patterned light guide plate has a pattern region corresponding to each pixel in the pixelated target pattern, and microstructures are formed in the pattern region. The first structural parameter includes at least one of the following parameters:

[0076] (1) The length of the microstructures;

[0077] As Figure 4 and Figure 5 shown, the longer the lengths of the microstructures 10 and 20, the more incident light they reflect, the higher the grayscale displayed, and the brighter the corresponding displayed pattern;

[0078] (2) The area ratio of the orthographic projection of the microstructures on the pattern region to the pattern region;

[0079] As Figure 6 shown in the (b) figure of

[0080] (3) The first angle between the light-facing surface of the microstructures and the incident light direction;

[0081] As Figure 11 and Figure 12 shown, the first angle between the light-facing surface of the microstructures 30 and the incident light direction can be different, that is, different first angles can enable the microstructures 30 to display different grayscales when coupled with the incident light in the preset direction.

[0082] Further, a plurality of microstructures are provided in the pattern area, and the light-facing surfaces of different microstructures have different orientations. By providing a plurality of microstructures in the pattern area, different patterns can be displayed in different incident light directions through a patterned light guide plate, improving the display performance of the patterned light guide plate. Optionally, the light-facing surfaces of two adjacent microstructures in the pattern area are orthogonal to each other, which is beneficial to effectively separate different target patterns in the incident light direction and further reduce the interference between different patterns.

[0083] Further, the microstructure further has a second structural parameter, and the second structural parameter is configured to reflect the incident light in the target direction to the viewing range of the human eye by the light-facing surface of the microstructure. Wherein, the second structural parameter includes a second included angle between the light-facing surface of the microstructure and the surface forming the microstructure. Thus, step S320 may include:

[0084] S321. Determine the second structural parameter of the microstructure;

[0085] S322. Prepare a microstructure template at least according to the first structural parameter and the second structural parameter of the microstructure.

[0086] Exemplarily, as Figure 4 shown, the light-facing surface 11 of the microstructure 10 has a second included angle with the surface forming the microstructure 10, wherein the surface forming the microstructure 10 is parallel to the direction of the incident light; and as Figure 13 shown in FIGS. (a) and (b) of

[0087] Further, there are at least two target patterns, and different target patterns are displayed by incident light in different target directions; at least two groups of microstructure arrays are formed on the patterned light guide plate. Wherein, the patterned light guide plate has a pattern area corresponding to each pixel of at least two pixelated target patterns, and at least two microstructures belonging to different microstructure arrays are formed in at least part of the pattern area. Taking Figure 6 shown as an example, when there are two target patterns, microstructures 10 and 20 can be provided in the pattern area where the pixels of the two target patterns overlap. Among them, the microstructures 10 and 20 belong to different microstructure arrays respectively. The microstructure 10 is coupled with the incident light in the first target direction to provide the brightness required for displaying the first target pattern, and the microstructure 20 is coupled with the incident light in the second target direction to provide the brightness required for displaying the second target pattern.

[0088] Further, at least part of the microstructure also has a third structural parameter, which is configured to reflect incident light in other target directions to outside the observation range of the human eye by the surface of the microstructure opposite to the light-facing surface. The third structural parameter includes a third included angle between the surface of the microstructure opposite to the light-facing surface and the surface forming the microstructure. Therefore, step S322 may include:

[0089] S322A. Determining the third structural parameter of the microstructure in each group of microstructure arrays;

[0090] S322B. Preparing a microstructure template according to the first structural parameter, the second structural parameter, and the third structural parameter of the microstructure.

[0091] Exemplarily, as Figure 4 shown, the surface 12 of the microstructure 10 opposite to the light-facing surface 11 has a third included angle with the surface forming the microstructure 10, wherein the surface forming the microstructure 10 is parallel to the direction of the incident light; the surface ACFD of the microstructure 30 opposite to the first light-facing surface ABED has a third included angle γ with the surface CBEF forming the microstructure 30, and the surface DEF of the microstructure 30 opposite to the second light-facing surface ABC has a third included angle β with the surface CBEF forming the microstructure 30.

[0092] By setting the third structural parameter, it can be ensured that while a patterned light guide plate realizes the display of different patterns, the interference between different patterns is avoided, and high-quality multi-pattern display is achieved.

[0093] Further, the third included angle is greater than the second included angle. As Figure 4 shown, the third included angle between the surface 12 opposite to the light-facing surface 11 and the surface forming the microstructure 10 is greater than the second included angle between the light-facing surface 11 and the surface forming the microstructure 10; as shown in FIGS. (a) and (b) of Figure 13 , γ > δ, β > α. In this way, not only can the light energy be fully utilized to improve the energy utilization rate, but also the transparency of the patterned light guide plate can be effectively improved, and the interference between different patterns when displaying multiple patterns can be reduced, thereby improving the overall display effect of the patterned light guide plate.

[0094] In some embodiments of the present application, when there are at least two target patterns, step S400 may include:

[0095] S410. Combining the microstructure templates of the pixels in each pixelated target pattern to form a microstructure array sub-graphic;

[0096] S420. Combining the microstructure array sub-graphics to form a microstructure array graphic;

[0097] Exemplarily, the "microstructure array graphic" may form multiple microstructures in the pattern area where the pixels of each target pattern overlap.

[0098] S430. Form at least two groups of micro-structure arrays on the light guide plate by using the micro-structure array graphics and texts.

[0099] By the above method, the preparation efficiency of the patterned light guide plate for multi-graph display can be improved, and the number of templates required to form different micro-structure arrays can be reduced. Of course, it is also possible not to combine them, but to use each micro-structure array sub-graphic to lithograph the light guide plate separately.

[0100] The inventive concept of the present application will be further elaborated below through three specific embodiments. Specific Embodiment 1

[0102] Please refer to Figures 2 to 6 , Specific Embodiment 1 provides a method for preparing a bidirectional double-graph patterned light guide plate, including the following steps:

[0103] Step 1. Select a target pattern and an incident light direction matching the target pattern. As shown in FIGS. (a) and (b) of Figure 2 , the target pattern includes target pattern 1 (flower) and target pattern 2 (squirrel). Among them, the incident light direction of target pattern 1 is from left to right, and the incident light direction of target pattern 2 is from top to bottom.

[0104] Step 2. Pixelize the target pattern. Figure 2 FIGS. (c) and (d) of respectively show the pixelized target pattern 1 (flower) and pixelized target pattern 2 (squirrel). Among them, the pixels in target pattern 1 (flower) and pixelized target pattern 2 (squirrel) are arranged at orthogonal intervals, and to ensure the fineness and transmittance of the displayed pattern, the side length of the pixel does not exceed 160 microns.

[0105] Step 3. Combine the pixels in the pixelized target pattern 1 according to gray levels, that is, the pixels with the same gray level are combined into a pixel combination, and the gray levels of different pixel combinations are different. As shown in Figure 3 , target pattern 1 (flower) has at least 4 pixel combinations with different gray levels. Similarly, the pixels in the pixelized target pattern 2 can also be divided into multiple pixel combinations with different gray levels according to gray levels.

[0106] Step 4. Determine the length of the arc-shaped micro-structure matching each pixel combination according to the gray level of each pixel combination, and then prepare a template for the arc-shaped micro-structure according to the length. In this specific embodiment, the first angle between the light-facing surface of each micro-structure and the incident light direction is the same. Figure 4 shows the arc-shaped micro-structures (micro-structures 1-4) matching at least some of the pixel combinations in target pattern 1 (flower), Figure 5It shows arc-shaped microstructures (microstructures 5 to 8) that match at least some of the pixel combinations in the target pattern 2 (squirrel). According to the length of the above-mentioned arc-shaped microstructures, templates of the corresponding arc-shaped microstructures can be prepared.

[0107] Step 5: Combine the microstructure templates of the target pattern 1 and the target pattern 2 to form a microstructure array graphic, and then use this microstructure array graphic as a mask to lithograph the light guide plate to form a microstructure array. As Figure 6 shown in Figure (a) of, after combining each pixel in the pixelated target pattern 1 and each pixel in the pixelated target pattern 2 together, there are pixel overlaps in some pattern areas, so that as Figure 6 shown in Figure (b) of, for the pattern areas with pixel overlaps, two microstructures are provided in this pattern area that are respectively oriented towards the first incident light and the second incident light that are orthogonal to each other, so as to achieve the bidirectional dual-pattern display of the patterned light guide plate 100 (as Figure 7 shown). Correspondingly, the microstructure templates of the target pattern 1 and the target pattern 2 can be correspondingly combined to form the above two microstructures in a pattern area through lithography.

[0108] On the other hand, when the patterned light guide plate displays a pattern, only light in one direction is incident at a time. Therefore, in order to reduce the mutual interference between the two patterns, the third angle between the surface 12 of the microstructure 10 opposite to the light-facing surface and the surface forming the microstructure 10 (such as 70°) is greater than the second angle (such as 45°) between the light-facing surface 11 of the microstructure 10 and the surface forming the microstructure 10. Thus, when the second incident light is incident, the second incident light is reflected by the surface 12 opposite to the light-facing surface and exits from the patterned light guide plate at a larger exit angle and is not observed by the human eye. Specific Embodiment 2

[0110] Please refer to Figures 8 to 10 , Specific Embodiment 2 provides a method for preparing a bidirectional dual-pattern patterned light guide plate. The steps of Specific Embodiment 2 are basically the same as those of Specific Embodiment 1, except that:

[0111] The arrangement and size of the pixels are different. Each pixel in the pixelated target pattern 3 (squirrel) and the pixelated target pattern 4 (flower) are arranged in a staggered manner, and the side length of each pixel does not exceed 120 micrometers. Further, Figure 9 Figure (a) of shows the microstructure array that matches each pixel in the pixelated target pattern 3 (squirrel), Figure 9 Figure (b) of shows the microstructure array that matches each pixel in the pixelated target pattern 4 (flower). It can be seen that the microstructures in the figure are also arranged in a corresponding staggered manner. Further, Figure 10Figure (a) shows a schematic diagram of the microstructure array of the combined pattern of target pattern 3 (squirrel) and target pattern 4 (flower). It can be seen that in the pattern area where the pixels overlap, multiple microstructures are also provided, and each pattern area is also arranged in a staggered manner.

[0112] Figure 10 Figure (b) shows a display schematic diagram of the microstructure array of the combined pattern when the first incident light and the second incident light are incident. It can be seen that Figure 10 The patterned light guide plate 200 can also achieve a better two-way dual-pattern display effect. Specific Embodiment 3

[0114] Please refer to Figures 11 to 15 , Specific Embodiment 3 provides a method for preparing a patterned light guide plate for two-way dual-pattern variable light display. The steps of Specific Embodiment 3 are basically the same as those of Specific Embodiment 1, except that:

[0115] (1) The target patterns are different. In Specific Embodiment 3, the target patterns adopt target light-variable pattern 1 and target light-variable pattern 2. Among them, the light-variable pattern means that at different viewing angles, the same pattern can display different gray levels.

[0116] (2) The arrangement mode and size of the pixels are different. Each pixel in the pixelated light-variable pattern 1 and the pixelated light-variable pattern 2 is arranged orthogonally, and the side length of each pixel does not exceed 200 microns.

[0117] (3) The types of microstructures are different. In Specific Embodiment 3, linear microstructures are adopted. As Figure 13 shown, the microstructure 30 includes a first light-facing surface ABED and a second light-facing surface ABC, as well as a surface ACFD opposite to the first light-facing surface ABED and a surface DEF opposite to the second light-facing surface ABC. Among them, the area ratio of the first light-facing surface ABED to the second light-facing surface ABC is between 3 and 15. The first light-facing surface ABED is a trapezoidal structure; the second light-facing surface ABC is a triangular structure. Optionally, as Figure 14 shown, when both the microstructure 30 and the microstructure 40 are formed in a pattern area at the same time, the light-facing surface of each microstructure can form an angle with the incident light of that time.

[0118] (4) The difference in the first structural parameter. The first structural parameter of Specific Embodiment 3 includes the first angle between the light-facing surface of the microstructure 30 and the incident light direction, and the lengths of the microstructures 30 are the same. As Figure 11 shown, the first angle between the first light-facing surface ABED of the microstructure 30 and the incident light direction can be 10°, 30°, -45°, -60° in sequence from left to right. As the viewing angle moves left and right, the bright area on the light-variable pattern 1 changes accordingly, generating a light-variable image effect; as Figure 12As shown, the first included angles between the first light-facing surface ABED of the microstructure 40 and the incident light direction can be 10°, 20°, -30°, and -50° in sequence from left to right. As the observation perspective moves up and down, the bright areas on the light-variable pattern 2 change accordingly, generating a light-variable image effect.

[0119] (5) Differences in the second structural parameter and the third structural parameter. As Figure 13 shown, the ranges of δ and α are 35° to 55°. For example, δ = 45°. Additionally, γ > δ and β > α, and the value ranges of γ and β are both 35 to 90°. For example, γ = 80°. When the patterned light guide plate displays the light-variable pattern 2, in the non-overlapping pixel regions, if the microstructure 30 is formed in this region, when the second incident light is incident on the surface ACFD opposite to the first light-facing surface ABED and / or the surface DEF opposite to the second light-facing surface ABC, the second incident light can exit from the patterned light guide plate at a relatively large angle outside the observation range of the human eye, thereby reducing the display interference of different patterns.

[0120] Figure 15 The schematic diagram of the microstructure array of the combined pattern of the target light-variable pattern 1 and the target light-variable pattern 2 is shown. Through this microstructure array, a better two-way and two-pattern variable light display effect can be achieved when the first incident light and the second incident light are incident respectively.

[0121] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0122] The above-described embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A method for preparing a patterned light guide plate, characterized in that, At least one set of microstructure arrays is formed on the patterned light guide plate, and the at least one set of microstructure arrays is configured to couple with incident light in a target direction to display a target pattern; The method includes: Obtaining a target pattern; Pixelating the target pattern and dividing each pixel in the pixelated target pattern into a plurality of different pixel combinations; Obtaining a microstructure template matching each pixel combination and matching a corresponding microstructure template to each pixel in the pixelated target pattern; Forming a microstructure array graphic according to the microstructure templates of each pixel, and forming the at least one set of microstructure arrays on the light guide plate according to the microstructure array graphic.

2. The preparation method according to claim 1, characterized in that, The dividing each pixel in the pixelated target pattern into a plurality of different pixel combinations includes: Obtaining the gray level of each pixel in the pixelated target pattern; Dividing each pixel into a plurality of different pixel combinations according to the gray level of each pixel; wherein, different pixel combinations have different gray levels.

3. The preparation method according to claim 2, wherein The obtaining a microstructure template matching each pixel combination includes: Determining a first structural parameter of the microstructure corresponding to each pixel combination according to the gray level of each pixel combination; wherein, the first structural parameter is configured to make the light-facing surface of the microstructure reflect a predetermined amount of incident light; Preparing the microstructure template at least according to the first structural parameter of the microstructure.

4. The preparation method according to claim 3, characterized in that, The patterned light guide plate has a pattern area corresponding to each pixel in the pixelated target pattern, and the microstructure is formed in the pattern area; The first structural parameter includes at least one of the following parameters: The area ratio of the orthographic projection of the microstructure in the pattern area to the pattern area; The length of the microstructure; The first included angle between the light-facing surface of the microstructure and the target direction.

5. The preparation method according to claim 3, wherein The microstructure further has a second structural parameter, and the second structural parameter is configured to make the light-facing surface of the microstructure reflect the incident light in the target direction into the viewing range of the human eye, wherein the second structural parameter includes the second included angle between the light-facing surface of the microstructure and the surface on which the microstructure is formed; The preparing the microstructure template at least according to the first structural parameter of the microstructure includes: Determining the second structural parameter of the microstructure; Preparing the microstructure template at least according to the first structural parameter and the second structural parameter of the microstructure.

6. The preparation method according to claim 5, wherein There are at least two target patterns, and different target patterns are displayed by incident light in different target directions; At least two sets of microstructure arrays are formed on the patterned light guide plate, wherein the patterned light guide plate has a pattern area corresponding to each pixel in at least two pixelated target patterns, and at least two microstructures belonging to different microstructure arrays are formed in at least part of the pattern area.

7. The preparation method according to claim 6, wherein At least a part of the microstructures further has a third structural parameter, which is configured to reflect incident light in other target directions to outside the observation range of the human eye from the surface of the microstructures opposite to the light-facing surface, wherein the third structural parameter includes a third included angle between the surface of the microstructures opposite to the light-facing surface and the surface forming the microstructures; Preparing the microstructure template according to at least the first structural parameter and the second structural parameter of the microstructures includes: Determining the third structural parameter of the microstructures in each group of microstructure arrays; Preparing the microstructure template according to the first structural parameter, the second structural parameter, and the third structural parameter of the microstructures.

8. The preparation method according to claim 7, characterized in that, The third included angle is greater than the second included angle.

9. The preparation method according to claim 6, characterized in that, Forming the microstructure array pattern according to the microstructure template of each pixel includes: Combining the microstructure templates of the pixels in each pixelated target pattern to form a microstructure array sub-pattern; Combining the microstructure array sub-patterns to form the microstructure array pattern; Forming at least two groups of microstructure arrays on the light guide plate by using the microstructure array pattern.

10. The preparation method according to any one of claims 1 to 9, characterized in that, The light-facing surface of the microstructures is any one of a trapezoidal plane, an arc surface, a combination of a plane and an arc surface; and the value range of the side length of the pixels in the pixelated target pattern is 100 micrometers to 250 micrometers.

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