Optical structure and wearable optical device

Abstract

The invention discloses an optical structure and wearable optical equipment, and belongs to the technical field of optical structures. The invention discloses an optical structure which comprises a polarization layer and a color eliminating layer, and the color eliminating layer is arranged on the side, away from the eyes of an observer, of the optical structure. The problem of rainbow lines generated when a user wears wearable optical equipment with a polarization function to observe a display screen is effectively solved or at least partially solved.

Description

Technical Field

[0001] This application relates to the field of optical structure technology, and in particular to an optical structure and a wearable optical device. Background Technology

[0002] With the rapid development of electronic display technology and the widespread adoption of smart terminal devices, people frequently come into contact with various displays in their daily lives and work, including smartphones, tablets, in-vehicle central control screens, and wearable display devices. To improve visual comfort and reduce glare, more and more users are wearing wearable optical devices with polarizing functions (such as polarized glasses and polarized sunglasses) for observation outdoors or in strong sunlight. These wearable optical devices can effectively filter out glare reflected from water surfaces, road surfaces, or glass surfaces, and block some ultraviolet rays, thus being widely used in driving, outdoor work, and leisure activities.

[0003] However, when viewing electronic displays with protective tempered glass screen protectors while wearing wearable optical devices, the internal stress generated during the manufacturing process of the polymer material inside the tempered glass film causes it to exhibit birefringence. This birefringence layer interacts with the polarization direction of the wearable optical device, producing noticeable rainbow patterns on the screen. This optical interference phenomenon not only severely reduces the contrast and color accuracy of the displayed image, affecting information reading efficiency, but may also cause visual fatigue and even dizziness, especially during prolonged use or in dynamic scene scenarios. Summary of the Invention

[0004] The main objective of this application is to provide an optical structure and a wearable optical device that aims to solve, or at least partially solve, the rainbow effect problem that occurs when a user wears a wearable optical device with polarizing function to view a display screen.

[0005] To achieve the above objectives, embodiments of this application provide an optical structure, which includes a polarizing layer and an anti-color layer; The color-masking layer is disposed on the side of the optical structure away from the observer's eye.

[0006] In one embodiment, the polarization degree of the polarizing layer is 20% to 48%.

[0007] In one embodiment, the angular deviation of the optical slow axis of the achromatic layer is 0° to 20°.

[0008] In one embodiment, the in-plane retardation value of the achromatic layer is 3000 nm to 20000 nm.

[0009] In one embodiment, the acute angle between the polarization direction of the polarizing layer and the optical slow axis direction of the achromatic layer is 15° to 45°.

[0010] In one embodiment, the material of the color-masking layer includes at least one of polyethylene terephthalate, pure polyethylene naphthol phthalate, and polyethylene terephthalate-1,4-cyclohexanediol ester.

[0011] In one embodiment, the polarizing layer includes a polarizing layer and a protective layer disposed on at least one side of the polarizing layer.

[0012] In one embodiment, the material of the protective layer includes at least one of cellulose triacetate, polymethyl methacrylate, and polyester.

[0013] This application also provides a wearable optical device, which includes the optical structure described above.

[0014] In one embodiment, the wearable optical device includes: glasses.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: providing an optical structure that can be applied to wearable optical devices with polarization function, including: a polarizing layer and an anti-color layer; by configuring the anti-color layer on the side of the optical structure away from the observer's eyes, that is, the side closer to the display device being observed, it can effectively suppress or eliminate the rainbow effect that appears on electronic displays (such as mobile phones, tablets or car screens with tempered glass screen protectors) when wearing polarized glasses. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the optical structure involved in the embodiments of this application; Figure 2 This is a schematic diagram of a scenario where the polarization direction of the polarizing layer and the optical slow axis direction of the anti-color layer are at an acute angle, according to an embodiment of this application. Figure 3 This is a schematic diagram illustrating the scenario of angular deviation of the optical slow axis of the achromatic layer involved in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the anti-color glasses involved in the embodiments of this application.

[0017] Explanation of reference numerals in the attached figures 100. Optical structure; 110. Polarizing layer; 120. Anti-color layer; 10. Eye.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0020] The optical structure and embodiments of the wearable optical device of this application are hereby specifically disclosed in detail with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0021] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is also expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0022] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0023] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0024] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0025] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0026] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the technical solution of this application is further described below in conjunction with the accompanying drawings and embodiments. However, this application is not limited to the listed embodiments, but should also include any other well-known modifications within the scope of the claims made in this application.

[0028] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0030] In conventional technologies, when users wear wearable optical devices to view electronic displays with protective tempered glass films, the internal stress generated during the manufacturing process of the polymer material inside the tempered glass film causes it to exhibit birefringence. This birefringence layer interacts with the polarization direction of the wearable optical device, producing noticeable rainbow patterns on the screen. This optical interference phenomenon not only severely reduces the contrast and color accuracy of the displayed image, affecting information reading efficiency, but may also cause visual fatigue and even dizziness, especially during prolonged use or in dynamic scene scenarios.

[0031] In this application embodiment, an optical structure is provided that can be applied to wearable optical devices with polarization function, including: a polarizing layer and an anti-color layer; by configuring the anti-color layer on the side of the optical structure away from the observer's eyes, that is, the side closer to the display device being observed, the rainbow effect that appears on electronic displays (such as mobile phones, tablets or car screens with tempered glass) when wearing polarized glasses can be effectively suppressed or eliminated.

[0032] Specifically, this anti-chroma layer possesses an extremely large in-plane retardation value, exhibiting a "multi-order waveplate" effect in the visible light spectrum: it introduces highly nonlinear and wavelength-dependent phase delays into incident light of different wavelengths, resulting in a randomized distribution of the polarization state of the transmitted light in spatial, temporal, and spectral dimensions. When polarized interference light from a display screen (e.g., a screen with a birefringence protective film) first passes through this anti-chroma layer, the originally ordered polarization interference pattern formed by stress birefringence is completely disrupted and homogenized. Subsequently, this highly dispersed polarization light is incident on the polarization functional layer, ensuring that any position on the screen achieves approximately the same and stable average transmittance across all visible wavelengths. As a result, the high-contrast rainbow effect originally caused by polarization interference is significantly blurred or even eliminated, while the polarization layer retains its effective ability to suppress ambient glare. This optical structure not only solves the technical problem of poor compatibility between wearable optical devices with polarization function and electronic displays from the perspective of optical mechanism, but also significantly improves the visual clarity, color consistency and long-term viewing comfort when users use smart terminal devices in strong light environment. It is particularly suitable for application scenarios with strict requirements for visual reliability, such as driving and outdoor work.

[0033] Reference Figure 1 The first aspect of this application provides an optical structure 100, including a polarizing layer 110 and an anti-color layer 120; wherein the anti-color layer 120 is disposed on the side of the optical structure 100 away from the observer's eye 10.

[0034] Optionally, the optical structure 100 is used in a wearable optical device with polarization function.

[0035] Optionally, the optical structure 100 includes a polarizing layer 110 and an anti-color layer 120 stacked together.

[0036] Optionally, the optical structure 100 includes a separable and cooperable polarizing layer 110 and an anti-color layer 120.

[0037] It is understood that the polarizing layer 110 and the anti-color layer 120 of the optical structure 100 in this embodiment are separable structures and can be disposed on two separate devices, but the rainbow effect can be eliminated through their synergistic effect.

[0038] For example, the optical structure 100 includes a separable polarizing layer 110 and an anti-color layer 120, wherein the polarizing layer 110 can be disposed on eyeglasses and the anti-color layer 120 can be disposed on a display screen. By using the polarizing layer 110 and the anti-color layer 120 together, the rainbow pattern problem caused when a user wears eyeglasses with polarizing function to view the display screen is avoided.

[0039] In one feasible embodiment, the in-plane retardation value of the achromatic layer 120 is 3000 nm to 20000 nm. For example, the in-plane retardation value of the achromatic layer 120 is 3000 nm, 4000 nm, 5000 nm, 6000 nm, 7000 nm, 8000 nm, 9000 nm, 10000 nm, 11000 nm, 12000 nm, 13000 nm, 14000 nm, 15000 nm, 16000 nm, 17000 nm, 18000 nm, 19000 nm, 20000 nm, etc.

[0040] In this embodiment, the anti-color layer 120 of the optical structure 100 has an extremely large in-plane retardation value, exhibiting a kind of "multi-order waveplate" in the visible light band: it introduces a highly nonlinear and wavelength-dependent phase retardation for incident light of different wavelengths, causing the polarization state of the transmitted light to exhibit a randomized distribution in the spatial, temporal, and spectral dimensions. When polarized interference light from the display screen (e.g., a screen with a birefringence protective film) first passes through the anti-color layer 120, the originally ordered polarization interference pattern formed by stress birefringence is completely disrupted and homogenized; subsequently, the highly dispersed polarization light is then incident on the polarization functional layer, so that any position on the screen obtains approximately the same and stable average transmittance at all visible wavelengths. As a result, the high-contrast rainbow pattern originally caused by polarization interference is significantly blurred or even eliminated, while the polarization layer 110 still retains its effective ability to suppress ambient glare. This optical structure 100 not only solves the technical problem of poor compatibility between wearable optical devices with polarization function and electronic displays from the perspective of optical mechanism, but also significantly improves the visual clarity, color consistency and long-term viewing comfort when users use smart terminal devices in strong light environment. It is particularly suitable for application scenarios with strict requirements for visual reliability, such as driving and outdoor work.

[0041] In one feasible embodiment, the polarization degree of the polarizing layer 110 is 20% to 48%. For example, the polarization degree of the polarizing layer 110 is 20%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, etc. If the polarization degree of the polarizing layer 110 is too low, it cannot effectively block horizontally polarized glare in strong light environments, resulting in decreased visual comfort for the wearer while driving or in outdoor scenarios, thus losing its core function. If the polarization degree of the polarizing layer 110 is too high, it is difficult to achieve in industrial manufacturing, and its anti-glare effect does not have a more significant advantage.

[0042] Optionally, the polarization degree of the polarizing layer 110 is 25% to 45%.

[0043] In one feasible implementation, refer to Figure 2 The acute angle α between the polarization direction of the polarizing layer 110 and the slow optical axis direction of the achromatic layer 120 is 15° to 45°. For example, α is 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0044] Optionally, the acute angle α between the polarization direction of the polarizing layer 110 and the optical slow axis direction of the anti-color layer 120 is 25°~45°.

[0045] In this embodiment, the acute angle α formed between the polarization direction of the polarizing layer 110 and the optical slow axis direction of the achromatic layer 120 needs to be limited to within 15°~45°. This is a key design parameter for achieving effective rainbow ripple suppression. Although the achromatic layer 120 has a large wavelength-dependent in-plane phase delay, which can convert incident polarized light into a light field with complex elliptical polarization states and highly dispersed polarization characteristics in the spectrum and space, if its optical slow axis is parallel (α ≈ 0°) or perpendicular (α ≈ 90°) to the polarization direction of the polarizing layer 110, the modulation effect of the polarization state by the achromatic layer 120 cannot be effectively converted into spatial and spectral homogenization of the output light intensity of the polarizing layer 110. At this time, after the light passes through the achromatic layer 120 and enters the polarizing layer 110, its transmittance still strongly depends on the polarization orientation and wavelength of the original interference pattern, resulting in the rainbow ripples not being sufficiently blurred. Only when α approaches 45° can the polarization state perturbation introduced by the anti-color layer 120 decouple the original interference information to the maximum extent in the projection direction of the polarizing layer 110, allowing light of different wavelengths and spatial positions to obtain similar average transmittance, thereby significantly reducing the visibility of the rainbow pattern. The closer the angle is to the ideal value, the higher the axial alignment accuracy requirements in the film lamination or coating process, and the higher the difficulty and cost of manufacturing tolerance control. Therefore, the embodiments of this application limit α to a reasonable range that balances anti-color performance and mass production feasibility, ensuring not only the effective functioning of the polarization mixer but also achieving synergistic optimization of technical effectiveness and industrial economics.

[0046] In one feasible embodiment, the optical slow axis angular deviation Δβ of the achromatic layer 120 is 0°~20°.

[0047] Optionally, the fast optical axis refers to the direction with the lowest refractive index within the thin film plane, and the slow optical axis refers to the direction with the highest refractive index within the thin film plane. Typically, the slow optical axis and the fast optical axis are perpendicular to each other. (See reference...) Figure 3 The optical slow axis angle deviation Δβ refers to the difference between the angle βi and β1 between any point on the reference line along any direction within the thin film and the reference direction. The selection of β1 or βi is arbitrary. Theoretically, the smaller this deviation, the better the light after passing through the anti-color layer 120 can be distributed along the slow axis direction of the anti-color layer 120, thereby achieving better anti-coloring function.

[0048] Optionally, the angular deviation between the optical slow axis of the achromatic layer 120 and the reference direction is 0° to 10°. In one feasible embodiment, the material of the anti-color layer 120 includes at least one selected from polyethylene terephthalate, pure polyethylene naphthol phthalate, and polyethylene terephthalate-1,4-cyclohexanediol ester. All of the above materials are substances with high intrinsic birefringence.

[0049] Optionally, the color of the polarizing layer 110 can be red, blue, gray, etc., and its color can be set according to actual needs. This application embodiment does not limit this.

[0050] In one feasible embodiment, the polarizing layer 110 includes a polarizing layer and a protective layer disposed on at least one side of the polarizing layer.

[0051] Optionally, the polarizing layer 110 includes a polarizing layer and protective layers disposed on both sides of the polarizing layer.

[0052] Optionally, the polarizing layer can be an iodine-based polarizing layer or a dye-based polarizing layer. For iodine-based polarizing layers, they can be prepared using conventional polarizing layer preparation processes, such as using polyvinyl alcohol resin, through processes like dissolution, casting, dyeing, and stretching to create a film with polarizing properties. For dye-based polarizing layers, they can be obtained by adding substances with or after stretching dichroism to thermoplastic polymers such as polyolefins, followed by blending extrusion, casting, and stretching.

[0053] Alternatively, the polarizing layer 110 can be prepared according to known methods, for example, by dyeing and stretching a polyvinyl alcohol film and then bonding a cellulose triacetate (TAC) film to both sides as a protective layer.

[0054] Alternatively, to improve impact resistance, a polycarbonate film can be bonded to at least one side of the polarizing layer.

[0055] Optionally, the optical structure 100 may have a curvature, for example, by pressing the aforementioned multilayer material into various curved shapes in a specific mold as needed.

[0056] Optionally, the protective layer material includes at least one of cellulose triacetate, polymethyl methacrylate, and polyester.

[0057] Optionally, to improve the scratch resistance of the optical structure 100, a hardened coating can be provided on one side surface of the anti-color layer 120 and the polarizing layer 110.

[0058] Optionally, in order to improve the UV protection function of the optical structure 100 outdoors, one or more UV-absorbing substances can be added to the anti-color layer 120. There are no special requirements for the UV-absorbing substances, as long as they can be compatible with the main substrate.

[0059] Alternatively, the basic processing method of the decolorization layer 120 can be prepared according to known polyester processing parameters. By adjusting the stretch ratio, heat setting, etc., polyester films with different parameters can be obtained.

[0060] Optionally, the polymer raw material can be prepared into a cast sheet, and the film can be configured as a single-layer or multi-layer structure depending on the slip effect during processing. For example, the film can be configured as a three-layer structure, with a small amount of opening agent added to the top and bottom outer layers to improve the peelability between the melt cast sheet and the extrusion die.

[0061] Optionally, without affecting the effect of the embodiments of this application, there are no special restrictions on the opening agent, which can be organic or inorganic.

[0062] Optionally, organic opening agents include oleamide, and inorganic opening agents include talc, silica, barium sulfate, etc.

[0063] Optionally, the particle size of silica in the inorganic opening agent is 1 μm to 10 μm, preferably 1.5 μm to 5 μm. Although increasing the particle size of the opening agent helps to increase the slippery effect, it also increases the surface haze. However, when the particle size is too small, it is difficult to guarantee the slippery effect.

[0064] Optionally, in the surface layer containing the opening agent, the concentration of the opening agent is 500 ppm to 9000 ppm, preferably 800 ppm to 6000 ppm. If the content of the opening agent is too high, it will affect the optical and mechanical properties of the film; but if the content is too low, it will not solve the problem of film adhesion.

[0065] For example, a specific preparation method is described using polyethylene terephthalate (PET). For the core layer of a casting with at least three layers, PET chips need to be dried, extruded using a single-screw or twin-screw extruder, and quenched below the glass transition temperature to obtain an amorphous casting. The drying method is not limited, but the water content of the PET chips is reduced to below 500 ppm. To ensure stability in the subsequent melt extrusion process and to prevent polyester degradation, it is more preferable to reduce the water content of the polyester chips to below 200 ppm, and even more preferable to reduce it to below 100 ppm. The dried polyester chips are then melt-extruded using an extruder, wherein the melt extrusion can be performed using a single-screw extruder, a twin-screw extruder, or various derivative extruders based on them. Taking a conventional single-screw extruder as an example, the feeding section temperature is Tm (melt temperature) ± 30℃ of the polymer raw material, the compression section temperature is Tm~Tm+35℃, the homogenization section temperature is Tm~Tm+35℃, and the die temperature is Tm~Tm+30℃. More preferably, the feeding section temperature is Tm± 20℃, the compression section temperature is Tm~Tm+15℃, and the homogenization section temperature is Tm+15~Tm+30℃. This is because if the feeding section temperature is lower than Tm, the single-screw extruder will not be able to provide sufficient forward thrust to allow the material to enter the compression section. If the feeding section temperature is higher than Tm+30℃, the polyester chips will melt in the feeding section due to excessive temperature and will not be able to enter the compression section. If the compression section temperature is lower than Tm, the material will not be fully plasticized in the compression section. If the temperature is higher than Tm+35℃, the melt will easily break down, leading to unstable pressure in the front section. The principles for setting the homogenization section and die temperatures are the same as above.

[0066] Alternatively, a twin-screw extruder can be used for surface extrusion because it allows for thorough mixing of the opening agent or other functional particles with the raw material. Since a twin-screw extruder with a venting function eliminates the need for pre-drying of the raw material during extrusion, a twin-screw extruder with a venting system is preferred.

[0067] Optionally, in order to filter out foreign matter and some incompletely plasticized particles in the raw material, a high-precision filter screen can be added to the extruder during melt extrusion. There are no special requirements for the form of the filter screen, such as disc filter or mesh filter. The size of the filtered particles is less than 15 μm, preferably less than 10 μm.

[0068] Optionally, the decolorizing layer 120 can be prepared by biaxial stretching or uniaxial stretching. Biaxial stretching refers to applying tension to the cast sheet in both the mechanical direction (MD) and the direction perpendicular to the mechanical direction (TD). Uniaxial stretching refers to applying tension to the cast sheet in only one of the MD or TD directions. Considering the overall thermal and mechanical properties of the film in both the MD and TD directions, biaxial stretching is preferred.

[0069] Optionally, the stretching method includes MD preheating, MD stretching, MD heat treatment, TD preheating, TD stretching, and TD heat treatment.

[0070] Optionally, the MD preheating temperature is 50℃~120℃, the MD stretching temperature is 60℃~130℃, and the MD heat treatment temperature is 20℃~50℃.

[0071] Optionally, the preheating temperature before TD stretching is 70℃~150℃, and the TD stretching temperature is 70℃~150℃, preferably 75℃~140℃.

[0072] Furthermore, embodiments of this application also provide a wearable optical device, including the optical structure described above.

[0073] In one feasible implementation, refer to Figure 4 The wearable optical device includes: glasses, which may be an anti-color glasses.

[0074] The beneficial effects of the wearable optical device provided in this application embodiment are the same as those of the optical structure provided in the above embodiments, and other technical features in the wearable optical device are the same as those disclosed in the above embodiments, and will not be repeated here.

[0075] In order to enable those skilled in the art to clearly understand the details and operations of the above embodiments of this application, and to demonstrate the significant improvement in performance of the embodiments of this application, the above technical solutions are illustrated below through multiple embodiments.

[0076] Example 1 (1) Select PET with an intrinsic viscosity of 0.67 dl / g, slice it and add silica particles with a concentration of 8000 ppm and a particle size of 2 μm. Mix it thoroughly to obtain a PET masterbatch for surface layer containing an opening agent. (2) By mass, 20 parts of core layer PET masterbatch and 100 parts of PET chips with an intrinsic viscosity of 0.67 dl / g were fed into a twin-screw extruder. The feeding section temperature was set to 245℃, the compression section temperature was set to 275℃, the homogenization section temperature was set to 275℃, and the die temperature was set to 275℃. The screw speed and the metering pump speed were adjusted to stabilize the pump pressure at 2MPa. 20 parts of surface layer PET masterbatch and 80 parts of PET chips with an intrinsic viscosity of 0.67 dl / g were fed into a twin-screw extruder. The melt extrusion section temperature was set to 260℃ and increased to 270℃. The melt conveying section and die temperature were set to 272℃. (3) The three-layer melt flowing out of the die is pressed onto the cooling roller for quenching by electrostatic bonding. The temperature of the cooling roller is kept constant at 30°C. Amorphous cast films of different thicknesses are made, and the thickness ratio of the three layers of the film is 12:76:12 by adjusting the extrusion amount. (4) Using the above-mentioned cast film, preheat at 80°C, then preheat by MD (80°C), stretch by MD (90°C) twice, and heat-treat by MD (28°C), then preheat at 95°C, stretch by 4.2 times in the transverse direction at 105°C, and then heat-treat at 220°C to obtain a 60 μm thick decolorizing layer 1; (5) Mark the MD and TD directions, and use a phase difference meter (RETS-100L) to test the R0 of the decolorization layer 1 at a wavelength of 550nm. The R0 is 6520 nm, and the difference Δβ between it and any ten β values ​​with the TD direction as the reference direction is 5°.

[0077] (6) The above-mentioned anti-coloring layer is attached to a polarizing layer formed of polyvinyl alcohol (PVA) and iodine, and to one side of a polarizing layer composed of cellulose triacetate attached to both sides of the polarizing layer to obtain an anti-coloring lens, wherein the acute angle between the polarization direction of the polarizing layer and the optical slow axis direction of the anti-coloring layer 1 is 45°, and the polarization degree of the polarizing layer is 42%.

[0078] Example 2 The difference from Example 1 is that the acute angle between the polarization direction of the polarizing layer and the optical slow axis direction of the achromatic layer is 30°.

[0079] Example 3 The difference from Example 1 is that the acute angle between the polarization direction of the polarizing layer and the slow optical axis direction of the achromatic layer is 15°.

[0080] Example 4 The difference from Example 1 is that the stretching ratio in the MD direction is adjusted to 2.2 times and the stretching ratio in the TD direction is adjusted to 4.6 times, resulting in an achromatic layer 2 with a thickness of 80 μm. The MD and TD directions are marked, and the R0 of the achromatic layer 2 is measured at a wavelength of 550 nm using a phase difference meter (RETS-100L), which is 8210 nm. The difference Δβ between the R0 and any ten β values ​​with the TD direction as the reference direction is 7°.

[0081] Example 5 The difference from Example 1 is that the stretching ratio in the MD direction was adjusted to 1.7 times and the stretching ratio in the TD direction was adjusted to 4 times, resulting in an anti-color layer 3 with a film thickness of 89 μm. After marking the MD and TD directions, the R0 of the anti-color layer 3 was measured at a wavelength of 550 nm using a phase difference meter (RETS-100L), which showed a value of 10215 nm. The difference Δβ between this value and any ten β values ​​with the TD direction as the reference direction was 7°.

[0082] Example 6 The difference from Example 1 is that the stretching ratio in the MD direction was adjusted to 3.0 times and the stretching ratio in the TD direction was adjusted to 5.0 times, resulting in an achromatic layer 4 with a thickness of 79 μm. After marking the MD and TD directions, the R0 of the achromatic layer 4 was measured at a wavelength of 550 nm using a phase difference meter (RETS-100L), which showed a value of 8973 nm. The difference Δβ between this value and any ten β values ​​with the TD direction as the reference direction was 11°.

[0083] Example 7 The difference from Example 1 is that the stretching ratio in the MD direction is adjusted to 3.0 times and the stretching ratio in the TD direction is adjusted to 4.3 times, resulting in an achromatic layer 5 with a thickness of 52 μm. After marking the MD and TD directions, the R0 of the achromatic layer 5 is measured at a wavelength of 550 nm using a phase difference meter (RETS-100L), which is 3000 nm. The difference Δβ between this and any ten β values ​​with the TD direction as the reference direction is 7°. The acute angle between the polarization direction of the polarizing layer and the slow optical axis direction of the achromatic layer is 20°.

[0084] Example 8 The difference from Example 1 is that the acute angle between the polarization direction of the polarizing layer and the optical slow axis direction of the achromatic layer is 35°.

[0085] Comparative Example 1 The difference from Example 1 is that the stretching ratio in the MD direction was adjusted to 3.1 times and the stretching ratio in the TD direction was adjusted to 3.6 times, resulting in an achromatic layer 6 with a thickness of 100 μm. After marking the MD and TD directions, the R0 of the achromatic layer was measured at a wavelength of 550 nm using a phase difference meter (RETS-100L). The R0 was 4389 nm, and the difference Δβ between it and any ten β values ​​with the TD direction as the reference direction was 23°.

[0086] Comparative Example 2 The difference from Example 1 is that the acute angle between the polarization direction of the polarizing layer and the optical slow axis direction of the achromatic layer is 5°.

[0087] Comparative Example 3 The difference from Example 1 is that the polarization degree of the polarizing layer is 18°.

[0088] A HUAWEI Pura70 Pro+ tablet smartphone with a tempered glass screen protector was set to display a white screen. The prepared anti-color glasses lenses were placed in front of both eyes, with the anti-color layer on the side of the lens furthest from the eyes and the light absorption axis of the polarizing layer parallel to the eyes. The phone screen was then observed and the results recorded.

[0089] The results observed visually are graded according to the following criteria, and the results are shown in Table 1 below, where ○ and △ are considered acceptable.

[0090] ○: No interference colors were observed from any angle. △: Slightly observed iridescent colors ×: Clear iridescent colors were observed. Table 1

[0091] According to the experimental results in Table 1 above, the anti-color glasses made based on the optical structure of this application embodiment can prevent the appearance of rainbow patterns when viewing a display such as a mobile phone. However, the anti-color glasses in Comparative Example 3 showed slight glare due to the low polarization degree (18°) of their polarizing layer.

[0092] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the patent protection scope of this application.

Claims

1. An optical structure, characterized in that, The optical structure includes a polarizing layer and an anti-color layer; The color-masking layer is disposed on the side of the optical structure away from the observer's eye.

2. The optical structure as described in claim 1, characterized in that, The polarization degree of the polarizing layer is 20%~48%.

3. The optical structure as described in claim 1, characterized in that, The optical slow axis of the achromatic layer has an angular deviation of 0° to 20°.

4. The optical structure as described in claim 1, characterized in that, The in-plane retardation value of the achromatic layer is 3000 nm to 20000 nm.

5. The optical structure as described in claim 1, characterized in that, The acute angle between the polarization direction of the polarizing layer and the slow optical axis direction of the achromatic layer is 15°~45°.

6. The optical structure as described in claim 1, characterized in that, The material of the anti-color layer includes at least one of polyethylene terephthalate, pure polyethylene naphthol phthalate, and polyethylene terephthalate-1,4-cyclohexanediol ester.

7. The optical structure as described in claim 1, characterized in that, The polarizing layer includes a polarizing layer and a protective layer disposed on at least one side of the polarizing layer.

8. The optical structure as described in claim 7, characterized in that, The material of the protective layer includes at least one of cellulose triacetate, polymethyl methacrylate, and polyester.

9. A wearable optical device, characterized in that, The wearable optical device includes the optical structure as described in any one of claims 1 to 8.

10. The wearable optical device as described in claim 9, characterized in that, The wearable optical device includes: eyeglasses.

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