Optical element, manufacturing method thereof and image display device

Abstract

The invention relates to the technical field of display, in particular to an optical element, a manufacturing method thereof and an image display device. In the embodiment of the invention, the blocking structures are arranged on the first region and the second region defined by the light-emitting surfaces and the non-light-emitting surfaces of the plurality of prism parts, so that the blocking structures are arranged on the upstream side and the downstream side of the non-light-emitting surfaces. Therefore, when the light shielding layer at least arranged on the non-light-emitting surface is manufactured, the blocking structure can prevent the light shielding layer from excessively shielding the light-emitting surface, so that the area covered by the light shielding layer can be controlled more accurately, and the required light-emitting amount can be maintained. Therefore, by using the optical element, the manufacturing method thereof and the image display device provided by the embodiment of the invention, the risk of image shielding can be reduced, so that the image display effect is improved. In addition, under the condition that the blocking structure is used, manufacturing of the shading layer is facilitated, and therefore the manufacturing efficiency can be improved, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to optical elements and their manufacturing methods, and image display devices. Background Technology

[0002] In automotive HUDs (Head-Up Displays), the image display effect is controlled by optical prisms and light-blocking structures mounted on the prisms. However, in practical applications, image occlusion problems can easily occur, leading to image defects such as partial image loss and blurred boundaries, which affect the driver's clear recognition of HUD information. Summary of the Invention

[0003] Therefore, it is necessary to provide an optical element and its manufacturing method, as well as an image display device, to improve the image display effect.

[0004] According to one aspect of this application, an embodiment of this application provides an optical element, including a body, multiple blocking structures, and multiple light-shielding layers. The body includes a base and multiple prism portions. The base has an incident light side and an exit light side disposed opposite each other along a first direction. The multiple prism portions are disposed on the exit light side along a second direction perpendicular to the first direction. Each prism portion has an exit light surface and a non-exit light surface. One side of each of the exit light surface and the non-exit light surface is spaced apart from each other and both are connected to the exit light side. The other sides of both the exit light surface and the non-exit light surface are connected to each other. The exit light surface has a first edge region connected to the non-exit light surface of the prism portion, and a second edge region opposite to the first edge region. The non-exit light surface has a third edge region connected to the exit light surface of the prism portion, and a fourth edge region opposite to the third edge region. The first edge region and the third edge region connected to the first edge region constitute a first region. The second edge region excluding the first second edge region and the fourth edge region connected to it constitute a second region. A blocking structure is provided on both the first region and the second region. Multiple light-shielding layers are provided in a one-to-one correspondence with multiple prism sections. The light-shielding layer is provided at least on the non-light-emitting surface of the corresponding prism section and is located on the target area. The target area is the region defined by the blocking structures on the first and second regions corresponding to the non-light-emitting surfaces.

[0005] In some embodiments, the ratio of the dimension of the blocking structure extending in a direction away from the light-emitting surface to the thickness of the light-shielding layer is 0.5 to 1.5.

[0006] In some embodiments, the blocking structure is located on the light-emitting surface, and the blocking structure extends in a direction away from the light-emitting surface. The angle between the extending direction of the blocking structure and the light-emitting surface is less than 90° and greater than 0°.

[0007] In some embodiments, the light-emitting surface has a first side connected to the non-light-emitting surface of the prism portion, and a second side opposite to the first side. Specifically, in the direction from the first side to the second side, the ratio d1 of the size of the first edge region to the size of the light-emitting surface satisfies: 0 < d1 ≤ 0.3; and / or, in the direction from the first side to the second side, the ratio d2 of the size of the second edge region to the size of the light-emitting surface satisfies: 0 < d2 ≤ 0.3.

[0008] In some embodiments, the non-light-emitting surface has a third side connected to the light-emitting surface of the prism portion, and a fourth side opposite to the third side. Specifically, in the direction from the third side to the fourth side, the ratio d3 of the size of the third edge region to the size of the non-light-emitting surface satisfies: 0 < d3 ≤ 0.3; and / or, in the direction from the third side to the fourth side, the ratio d4 of the size of the fourth edge region to the size of the non-light-emitting surface satisfies: 0 < d4 ≤ 0.3.

[0009] In some embodiments, the multiple blocking structures are all located on the light-emitting surfaces of the multiple prisms; or, the multiple blocking structures are all located on the non-light-emitting surfaces of the multiple prisms.

[0010] In some embodiments, the material of the light-shielding layer is ink.

[0011] According to another aspect of this application, embodiments of this application provide a method for manufacturing an optical element, used to manufacture the optical element in any of the above embodiments. The method for manufacturing the optical element includes:

[0012] Provide an entity;

[0013] Multiple blocking structures are fabricated on the main body using a pre-defined process;

[0014] A light-shielding layer is formed through a coating process;

[0015] The preset processes include mold processing, adhesive coating, or other processing techniques.

[0016] In some embodiments, the mold processing technology includes one of injection molding, compression molding, injection compression molding, thermoforming, and embossing. The adhesive coating process includes one of dispensing, inkjet printing, and 3D printing. The processing technology includes one of laser processing, ultra-precision machining, and CNC machining.

[0017] In some embodiments, the preset process includes a mold processing process or a processing process. The material of the barrier structure includes one of polymethyl methacrylate, polycarbonate, cyclic olefin copolymer, and cyclic olefin polymer.

[0018] In some embodiments, the preset process includes an adhesive coating process. The material of the barrier structure includes one of ink, liquid optically transparent adhesive, thermosetting material, and photocurable material.

[0019] According to another aspect of this application, an embodiment of this application provides an image display device including the optical element in any of the above embodiments; or, including an optical element manufactured by a method for manufacturing the optical element in any of the above embodiments.

[0020] In the aforementioned optical element, its manufacturing method, and image display device, the optical element includes at least a body, multiple blocking structures, and multiple light-shielding layers. The body includes at least a base and multiple prism portions. By providing blocking structures on the first and second regions defined by the light-emitting and non-light-emitting surfaces of the multiple prism portions, blocking structures are provided on both the upstream and downstream sides of the non-light-emitting surface. Thus, when manufacturing the light-shielding layer at least on the non-light-emitting surface, the blocking structures can prevent the light-shielding layer from excessively obscuring the light-emitting surface, thereby allowing for more precise control of the area covered by the light-shielding layer, which is beneficial for maintaining the required light output. Therefore, by using the optical element, its manufacturing method, and the image display device provided in this application, the risk of image occlusion can be reduced, thereby improving the image display effect. Furthermore, the use of blocking structures also facilitates the manufacturing of the light-shielding layer, thereby improving manufacturing efficiency and reducing manufacturing costs.

[0021] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure in which an optical prism and a light-shielding structure are combined in some embodiments of the related technology;

[0024] Figure 2 This is a schematic diagram of the combination of an optical prism and a light-shielding structure in other embodiments of the related technology;

[0025] Figure 3 This is a schematic diagram of the structure of optical elements in some embodiments of this application;

[0026] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point P;

[0027] Figure 5 for Figure 4 The diagram shows the structure after removing the light-shielding layer.

[0028] Figure 6 This is a schematic diagram of the structure of the prism part and the blocking structure in some other embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the structure in which the prism, the blocking structure, and the light-shielding layer cooperate in some embodiments of this application;

[0030] Figure 8 This is a flowchart illustrating the fabrication method of the optical element in some embodiments of this application;

[0031] Figure 9 This is a schematic diagram of the structure for fabricating the blocking structure in some embodiments of this application;

[0032] Figure 10 This is a schematic diagram of the structure for fabricating the blocking structure in some other embodiments of this application;

[0033] Figure 11 This is a schematic diagram of the structure for making a blocking structure in some embodiments of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] Optical prism 10, R angle 11, light-shielding structure 20, image ray G1, sunlight G2;

[0036] Overflow area B;

[0037] Optical element 100;

[0038] Body 110, base 111, light-incident side s1, light-outcrystal side s2, prism part 112, light-outcrystal surface m1, first edge region z1, second edge region z2, non-light-outcrystal surface m2, third edge region z3, fourth edge region z4, first region N1, second region N2.

[0039] The blocking structure is 120°, with a height of h and an angle of α.

[0040] Light-shielding layer 130, thickness w;

[0041] Dimensions L1, L2, L3, L4, L5, L6;

[0042] First direction F1, second direction F2;

[0043] Steps S110, S120, and S130;

[0044] Mold 200;

[0045] Coating head 300;

[0046] Processing head 400. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0053] Current automotive HUDs require optical prisms to control light direction and block glare. For example, please refer to... Figure 1 , Figure 1 This is a schematic diagram illustrating the structure of the optical prism 10 and the light-shielding structure 20 in some embodiments of the related art. The light-shielding structure 20 covers the radius 11 (R-angle) of the optical prism 10, which is typically between 10 and 100 micrometers or smaller. Image light G1 is emitted through the light-emitting surface of the optical prism 10. The light-shielding structure 20 not only absorbs and scatters the light, reducing the risk of glare, but also blocks sunlight G2 from entering the optical prism 10. This allows for control over the image display effect.

[0054] The light-shielding structure 20 is typically an ink layer, which can be fabricated using planar coating processes (such as screen printing, dispensing, spraying, or pad printing). In practical applications, refer to... Figure 2 , Figure 2 This is a schematic diagram of the structure of the optical prism 10 and the light-shielding structure 20 in some other embodiments of the related technology. When the ink covers a large amount of the light-emitting surface of the optical prism and overflow occurs, an overflow area B is formed, which can easily cause image obstruction and thus produce image defects.

[0055] Since the light-shielding structure 20 covers the R-angle 11 of the optical prism 10, the light-shielding structure 20 is a three-dimensional structure. When using some of the aforementioned processes to manufacture the light-shielding structure 20, the following problems exist: (1) Screen printing cannot be applied to three-dimensional structures; (2) Since the light-emitting surface of the optical prism 10 cannot be contaminated with ink or residual adhesive, a mask or protective layer needs to be made to protect the light-emitting surface of the optical prism 10. Taking protective tape as an example, protective tape has cutting limits, precision requirements, and alignment problems; (3) When the length and width of the optical prism are more than 30 cm, using nanoscale coating or a slower coating speed will result in excessively long manufacturing time, thereby increasing manufacturing costs. Therefore, how to achieve large-area coating while controlling accuracy and covering the R-angle 11 is a difficult problem to solve.

[0056] Based on this, the embodiments of this application can block the overflow of material used to make the light-shielding structure by adding microstructures around the R-angle of the optical prism, thereby making it easier to manufacture while more accurately controlling the light-shielding area and maintaining the required fixed amount of light output.

[0057] The optical elements provided in the embodiments of this application are described below with reference to the accompanying drawings and some embodiments, but are not limited thereto.

[0058] According to some embodiments of this application, please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of the optical element 100 in some embodiments of this application. Figure 4 for Figure 3 The partial magnified structural diagram at point P shows that this application provides an optical element 100, including a body 110, multiple blocking structures 120 and multiple light-shielding layers 130.

[0059] The body 110 is the core structural part of the optical element 100 that directly carries the core optical functions and determines its optical characteristics; it is the basic carrier for the optical element 100 to realize its optical functions. The body 110 includes a base 111 and a plurality of prism sections 112. The base 111 has an incident light side s1 and an exit light side s2 disposed opposite each other along a first direction F1. The plurality of prism sections 112 are disposed on the exit light side s2 along a second direction F2 perpendicular to the first direction F1. It should be noted that... Figure 3 The diagram shows a portion of the structure of the optical element 100, and the number of prism sections 112 is not specifically limited.

[0060] The prism section 112 is a component that can reflect and refract light. The prism section 112 has a light-emitting surface m1 and a non-light-emitting surface m2. One side of both the light-emitting surface m1 and the non-light-emitting surface m2 is spaced apart from each other and connected to the light-emitting side s2. The other sides of both the light-emitting surface m1 and the non-light-emitting surface m2 are connected to each other. The light-emitting surface m1 has a first edge region z1 connected to the non-light-emitting surface m2 of the prism section 112, and a second edge region z2 opposite to the first edge region z1. The non-light-emitting surface m2 has a third edge region z3 connected to the light-emitting surface m1 of the prism section 112, and a fourth edge region z4 opposite to the third edge region z3. The first edge region z1 and the third edge region z3 connected to the first edge region z1 constitute a first region N1. The second edge region z2 (excluding the first second edge region z2) and the fourth edge region z4 connected to it constitute a second region N2.

[0061] The blocking structure 120 is used to block the light-shielding layer 130. A blocking structure 120 is provided on both the first region N1 and the second region N2.

[0062] The light-shielding layer 130 can absorb and scatter light, reducing the risk of glare, and can also block sunlight from entering the optical element 100. Multiple light-shielding layers 130 are provided one-to-one with multiple prism sections 112, and the light-shielding layer 130 is at least provided on the non-light-emitting surface m2 of the corresponding prism section 112, and is located on the target area. The target area is the region defined by the blocking structures 120 on the first area N1 and the second area N2 corresponding to the non-light-emitting surface m2.

[0063] Therefore, by providing blocking structures 120 on the first region N1 and the second region N2 defined by the light-emitting surface m1 and the non-light-emitting surface m2 of the plurality of prism sections 112, blocking structures 120 are provided on both the upstream and downstream sides of the non-light-emitting surface m2. Thus, when fabricating a light-shielding layer 130 at least on the non-light-emitting surface m2, the blocking structures 120 can prevent the light-shielding layer 130 from excessively obscuring the light-emitting surface m1, thereby allowing for more precise control of the area covered by the light-shielding layer 130, which helps maintain the required light output. Therefore, by using the optical element 100 and its fabrication method provided in this application embodiment, and the image display device, the risk of image occlusion can be reduced, thereby improving the image display effect. Furthermore, the use of blocking structures 120 also facilitates the fabrication of the light-shielding layer 130, thereby improving manufacturing efficiency and reducing manufacturing costs.

[0064] Based on some embodiments of this application, please continue to refer to Figure 3 and Figure 4 The ratio of the dimension of the blocking structure 120 extending in the direction away from the light-emitting surface m1 to the thickness w of the light-shielding layer 130 is 0.5 to 1.5.

[0065] For example, with Figure 4For example, the dimension of the blocking structure 120 extending in the direction away from the light-emitting surface m1 is the height h of the blocking structure 120. The ratio of the height h of the blocking structure 120 to the thickness w of the light-shielding layer 130 can be 0.5, 0.6, 0.8, 1.2, or 1.5. Of course, the ratio of the height h of the blocking structure 120 to the thickness w of the light-shielding layer 130 can be any value within the range of 0.5 to 1.5, and no specific limitation is made here.

[0066] Thus, by controlling the ratio of the dimension of the blocking structure 120 extending in the direction away from the light-emitting surface m1 to the thickness w of the light-shielding layer 130, it is possible to reduce manufacturing costs, reduce interference during manufacturing, and reduce the risk of collision with other components while achieving better overflow effect.

[0067] According to some embodiments of this application, please refer to Figure 5 , Figure 5 for Figure 4 The schematic diagram shows the structure of removing the light-shielding layer 130. The blocking structure 120 is located on the light-emitting surface m1. The blocking structure 120 extends in a direction away from the light-emitting surface m1. The angle α between the extension direction of the blocking structure 120 and the light-emitting surface m1 is less than 90° and greater than 0°.

[0068] For example, with Figure 5 For example, the angle α between the extending direction of the blocking structure 120 and the light-emitting surface m1 can be 89°, 80°, 70°, 60°, 45°, or 30°. Of course, the angle α between the extending direction of the blocking structure 120 and the light-emitting surface m1 can be any value within the above range, and no specific limitation is imposed here. For example, taking... Figure 6 For example, Figure 6 This is a schematic diagram showing the structure of the prism portion 112 and the blocking structure 120 cooperating in other embodiments of this application. Figure 6 The angle α shown is greater than Figure 5 The angle α is shown in the figure.

[0069] Thus, by controlling the tilt angle of the blocking structure 120, it is beneficial to obtain a larger range of emitted light while blocking the light-shielding layer 130, and the blocking structure 120 is beneficial for guiding light when it is located on the light-emitting surface m1, thereby further improving the visual effect.

[0070] Based on some embodiments of this application, please continue to refer to Figure 4 and Figure 5The light-emitting surface m1 has a first side connected to the non-light-emitting surface m2 of the prism section 112, and a second side opposite to the first side. Specifically, in the direction from the first side to the second side, the ratio d1 of the size L1 of the first edge region z1 to the size L2 of the light-emitting surface m1 satisfies: 0 < d1 ≤ 0.3; and / or, in the direction from the first side to the second side, the ratio d2 of the size L3 of the second edge region z2 to the size L2 of the light-emitting surface m1 satisfies: 0 < d2 ≤ 0.3.

[0071] For example, the ratio d1 can be 0.1, 0.2, 0.25, or 0.3. Of course, the ratio d1 can be any value within the above range, without specific limitation. The ratio d2 can be 0.1, 0.2, 0.25, or 0.3. Of course, the ratio d2 can be any value within the above range, without specific limitation.

[0072] Thus, by controlling the size of the first edge region z1 and / or the second edge region z2, that is, controlling the position where the blocking structure 120 can be set, it is not only beneficial to block the light-shielding layer 130, but also to obtain the required light-emitting range.

[0073] Based on some embodiments of this application, please continue to refer to Figure 4 and Figure 5 The non-light-emitting surface m2 has a third side connected to the light-emitting surface m1 of the prism section 112, and a fourth side opposite to the third side. Specifically, in the direction from the third side to the fourth side, the ratio d3 of the dimension L4 of the third edge region z3 to the dimension L5 of the non-light-emitting surface m2 satisfies: 0 < d3 ≤ 0.3; and / or, in the direction from the third side to the fourth side, the ratio d4 of the dimension L6 of the fourth edge region z4 to the dimension L5 of the non-light-emitting surface m2 satisfies: 0 < d4 ≤ 0.3.

[0074] For example, the ratio d3 can be 0.1, 0.2, 0.25, or 0.3. Of course, the ratio d3 can be any value within the above range, and there is no specific limitation here. The ratio d4 can be 0.1, 0.2, 0.25, or 0.3. Of course, the ratio d4 can be any value within the above range, and there is no specific limitation here.

[0075] Thus, by controlling the size of the third edge region z3 and / or the fourth edge region z4, that is, controlling the position where the blocking structure 120 can be set, it is not only beneficial to block the light-shielding layer 130, but also to obtain the required light-emitting range.

[0076] Based on some embodiments of this application, please continue to refer to Figure 3 , Figure 4 , Figure 5 and Figure 6Multiple blocking structures 120 are located on the light-emitting surfaces m1 of multiple prism sections 112. Alternatively, please refer to... Figure 7 , Figure 7 This is a schematic diagram of the structure of the prism portion 112, the blocking structure 120 and the light-shielding layer 130 in some embodiments of this application. The multiple blocking structures 120 are all located on the non-light-emitting surface m2 of the multiple prism portions 112.

[0077] Thus, by using the blocking structure 120 provided in this application embodiment, it is beneficial to flexibly control the coverage range of the light-shielding layer 130, thereby obtaining different ranges of light output and meeting different usage requirements, without making specific limitations here.

[0078] Based on some embodiments of this application, please continue to refer to Figure 3 , Figure 4 and Figure 7 The material of the light-shielding layer 130 is ink.

[0079] This not only makes it easier to manufacture the light-shielding layer 130, but also helps to reduce manufacturing costs.

[0080] According to some embodiments of this application, please refer to Figure 8 , Figure 8 This is a flowchart illustrating the fabrication method of an optical element in some embodiments of this application. Embodiments of this application provide a method for fabricating an optical element, used to fabricate the optical element in any of the above embodiments. The method for fabricating the optical element includes:

[0081] Step S110: Provide an entity;

[0082] Step S120: Fabricate multiple blocking structures on the body using a preset process; wherein, the preset process includes mold processing, adhesive coating process or processing process.

[0083] Step S130: Form a light-shielding layer through a coating process.

[0084] The advantages of the aforementioned optical elements are also present in the manufacturing method of the optical elements provided in the embodiments of this application, and will not be elaborated here.

[0085] Understandably, this is in conjunction with reference. Figure 9 , Figure 9 This is a schematic diagram of the structure for fabricating the blocking structure 120 in some embodiments of this application. Figure 9 The diagram illustrates mold 200. (Refer to reference.) Figure 10 , Figure 10 This is a schematic diagram of the structure for fabricating the blocking structure 120 in other embodiments of this application. Figure 10 The diagram illustrates the coating head 300. (Refer to reference.) Figure 11 , Figure 11This is a schematic diagram of the fabrication of the blocking structure 120 in some embodiments of this application. By using the aforementioned preset process, it is easier to fabricate a more precise structure, thereby further improving the overflow situation and making it easier to control the coverage area of ​​the light-shielding layer. It should be noted that when using the blocking structure in conjunction with the fabrication, it is easier to fabricate the light-shielding layer over a larger area, thereby improving manufacturing efficiency.

[0086] According to some embodiments of this application, the mold processing technology includes one of injection molding, compression molding, injection compression molding, hot pressing, and embossing. The adhesive coating process includes one of dispensing, inkjet printing, and 3D printing. The processing technology includes one of laser processing, ultra-precision machining, and CNC machining.

[0087] Therefore, the appropriate process can be flexibly selected to manufacture the barrier structure, without specific restrictions.

[0088] According to some embodiments of this application, the preset process includes a mold processing process or a processing process. The material of the barrier structure includes one of polymethyl methacrylate (PMMA), polycarbonate (PC), cyclic olefin copolymer (COC), and cyclic olefin polymer (COP).

[0089] The aforementioned materials all possess good melt flowability and easy formability, which helps to improve manufacturing precision and also helps to reduce manufacturing costs.

[0090] According to some embodiments of this application, the preset process includes an adhesive coating process. The material of the barrier structure includes one of ink, liquid optically transparent adhesive (LOCA), thermosetting material, and photocurable material (e.g., UV-curable material).

[0091] This not only makes production easier but also helps to shorten production time, thereby reducing production costs.

[0092] According to some embodiments of this application, this application provides an image display device including the optical element in any of the above embodiments; or, including an optical element manufactured by the method of manufacturing the optical element in any of the above embodiments.

[0093] For example, the image display device may be a vehicle-mounted HUD.

[0094] The advantages of the optical elements and the methods used to manufacture them are also present in this image display device, and will not be elaborated upon here.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical element, characterized by, The optical element comprises: a body comprising a base and a plurality of prism portions, the base having an incident light side and an emergent light side oppositely arranged along a first direction, the plurality of prism portions being arranged on the emergent light side along a second direction perpendicular to the first direction, each prism portion having an emergent light surface and a non-emergent light surface, one side of each of the emergent light surface and the non-emergent light surface being spaced apart from each other and connected to the emergent light side, the other side of each of the emergent light surface and the non-emergent light surface being connected to each other, the emergent light surface having a first edge region connected to the non-emergent light surface of the prism portion and a second edge region opposite to the first edge region, the non-emergent light surface having a third edge region connected to the emergent light surface of the prism portion and a fourth edge region opposite to the third edge region, the first edge region and the third edge region connected to the first edge region forming a first region, and the second edge region excluding the first second edge region and the fourth edge region connected to the second edge region forming a second region; a plurality of blocking structures, one blocking structure being arranged on each of the first region and the second region; and a plurality of light shielding layers, one light shielding layer being arranged corresponding to each of the plurality of prism portions, the light shielding layer being arranged on the non-emergent light surface of the corresponding prism portion and located on a target region, the target region being a region defined by the blocking structure on the first region and the second region corresponding to the non-emergent light surface.

2. The optical element according to claim 1, characterized in that The ratio of the size of the blocking structure extending in the direction away from the emergent light surface to the thickness of the light shielding layer is 0.5 to 1.

5.

3. The optical element according to claim 1, characterized by The blocking structure is located on the emergent light surface, the blocking structure is arranged extending in the direction away from the emergent light surface, and the angle between the extending direction of the blocking structure and the emergent light surface is less than 90° and greater than 0°.

4. The optical element according to any one of claims 1 to 3, characterized in that The emergent light surface has a first side connected to the non-emergent light surface of the prism portion and a second side opposite to the first side; wherein the ratio d1 of the size of the first edge region to the size of the emergent light surface in the direction from the first side to the second side satisfies 0 < d1 ≤ 0.3; and / or the ratio d2 of the size of the second edge region to the size of the emergent light surface in the direction from the first side to the second side satisfies 0 < d2 ≤ 0.

3.

5. The optical element according to any one of claims 1 to 3, characterized in that The non-emergent light surface has a third side connected to the emergent light surface of the prism portion and a fourth side opposite to the third side; wherein the ratio d3 of the size of the third edge region to the size of the non-emergent light surface in the direction from the third side to the fourth side satisfies 0 < d3 ≤ 0.3; and / or the ratio d4 of the size of the fourth edge region to the size of the non-emergent light surface in the direction from the third side to the fourth side satisfies 0 < d4 ≤ 0.

3.

6. The optical element according to any one of claims 1 to 3, characterized in that The plurality of blocking structures are all located on the emergent light surfaces of the plurality of prism portions; or The plurality of blocking structures are all located on the non-emergent light surfaces of the plurality of prism portions.

7. The optical element according to any one of claims 1 to 3, characterized in that The material of the light shielding layer is ink.

8. A method of producing an optical element, characterized by, A method for manufacturing the optical element according to any one of claims 1-7, the method comprising: providing a body; manufacturing a plurality of blocking structures on the body by a preset process; forming a light shielding layer by a coating process; The preset process includes a mold processing process, a glue material coating process, or a processing process.

9. The method of producing an optical element according to claim 8, wherein The mold processing process includes one of an injection molding process, a compression molding process, an injection compression molding process, a hot press molding process, and an imprint molding process. The glue material coating process includes one of a dispensing process, an inkjet process, and a 3D printing process. The processing process includes one of a laser processing process, an ultra-precision processing process, and a numerical control processing process.

10. The method of producing an optical element according to claim 8 or 9, wherein The preset process includes a mold processing process or a processing process. The material of the blocking structure includes one of polymethyl methacrylate, polycarbonate, cyclic olefin copolymer, and cyclic olefin polymer.

11. The method of producing an optical element according to claim 8 or 9, wherein The preset process includes a glue material coating process. The material of the blocking structure includes one of ink, liquid optical transparent glue, heat-curable material, and light-curable material.

12. An image display device, characterized by comprising: The optical element includes the optical element of any one of claims 1-7, or the optical element manufactured by the manufacturing method of any one of claims 8-11.

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