Polarizing sheet and display device

Abstract

The application provides a polarizer and a display device. The polarizer comprises a polarizing layer and a large-viewing-angle optical layer. The large-viewing-angle optical layer is arranged on one side of the polarizer. The large-viewing-angle optical layer comprises a diffusion layer and a light guide layer. The diffusion layer is located between the light guide layer and the polarizing layer. The refractive index of the diffusion layer is greater than the refractive index of the light guide layer. During the assembly of the display device, after the process of bonding the polarizer and the display panel is completed, the display device can have the function of increasing the visible viewing angle. The process of separately bonding the large-viewing-angle optical film is saved, thereby improving the device efficiency of the display device. In addition, by arranging the diffusion layer, more light can enter the large-viewing-angle area, and the problem that the light emitted to the oblique side of the display device is weak can be improved. The arrangement of the diffusion layer also enables more light of each color of the sub-pixels in the display device to enter the large-viewing-angle area, thereby improving the color deviation problem under the large viewing angle.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a polarizer and display device. Background Technology

[0002] Some application scenarios require display devices with wide viewing angles, such as those used for teaching in classrooms or in medium to large conference rooms. The content displayed on these devices needs to be visible to people seated in different positions; therefore, the display devices need to have a wide viewing angle.

[0003] In some display devices in related technologies, a wide-viewing-angle optical film is laminated on the light-incident side of the display panel or between the display panel and the glass cover to increase the viewing angle. However, this method affects the assembly efficiency of the display device. In addition, the wide-viewing-angle optical films used in these display devices do not have ideal optical performance at wide viewing angles. Specifically, they fail to adequately address the issue of weak light emitted from the oblique sides of the display device and are prone to color shift at wide viewing angles. Utility Model Content

[0004] An embodiment of the first aspect of this application provides a polarizer and a display device, which aims to improve the assembly efficiency of the display device and improve the optical effect of a wide viewing angle.

[0005] The specific technical solution is as follows: This application provides a polarizer, which includes a polarizing layer and a wide-viewing-angle optical layer. The wide-viewing-angle optical layer is disposed on one side of the polarizer and includes a diffusion layer and a light guide layer. The diffusion layer is located between the light guide layer and the polarizing layer, and the refractive index of the diffusion layer is greater than that of the light guide layer.

[0006] The polarizer in this embodiment includes a polarizing layer and a wide-viewing-angle optical layer, which integrates the film layer realizing the wide-viewing-angle function into the polarizer. During the assembly of the display device, after the process of bonding the polarizer to the display panel is completed, the display device can have the function of increasing the viewing angle. Compared with the assembly process of display devices in related technologies, the process of separately bonding the wide-viewing-angle optical film is saved, thereby improving the device efficiency of the display device.

[0007] Furthermore, the wide-viewing-angle optical layer of the polarizer includes a light guide layer and a diffusion layer. The refractive index of the diffusion layer is greater than that of the light guide layer. By setting the diffusion layer, more light can enter the wide-viewing-angle area, thereby improving the problem of weak light emitted from the oblique sides of the display device. Moreover, the diffusion layer also allows each color sub-pixel in the display device to have more light entering the wide-viewing-angle area, compensating for brightness at wide viewing angles. After compensation, the brightness difference between different color sub-pixels at wide viewing angles is reduced, thus improving color shift issues at wide viewing angles.

[0008] In some embodiments, the diffusion layer includes a substrate and a plurality of scattering structures distributed on the substrate, wherein the refractive index of the scattering structures is not equal to the refractive index of the substrate, wherein the refractive index of the substrate is greater than the refractive index of the light guide layer, and the refractive index of the scattering structures is greater than the refractive index of the light guide layer.

[0009] By incorporating a scattering structure within the substrate, a diffusion layer is formed that diffuses light. Furthermore, the refractive indices of both the substrate and the scattering structure are greater than those of the light-guiding layer. This results in an overall higher refractive index for the diffusion layer compared to the light-guiding layer, thereby increasing the light emission angle and enabling the wide-viewing-angle optical layer to enhance the viewing angle.

[0010] In some embodiments, the refractive index of the light guide layer is greater than or equal to 1.44 and less than or equal to 1.57, the refractive index of the substrate is greater than or equal to 1.60 and less than or equal to 1.72, and the refractive index of the scattering structure is greater than or equal to 1.60 and less than or equal to 1.72.

[0011] This configuration satisfies the requirement that the overall refractive index of the diffusion layer is greater than that of the light guide layer, thus increasing the light emission angle. Furthermore, when the refractive indices of the substrate, the scattering structure, and the light guide layer meet the aforementioned conditions, the display device can achieve an increased viewing angle without causing excessively low brightness at the normal viewing angle.

[0012] In some embodiments, the scattering structure is a scattering particle with a diameter greater than or equal to 100 nm and less than or equal to 500 nm.

[0013] When the diameter of the scattering particles is greater than or equal to 100 nm and less than or equal to 500 nm, the scattering particles can achieve better scattering effect, thereby enabling the diffusion layer to achieve better diffusion effect.

[0014] In some embodiments, the light guide layer includes a plurality of light guide structures, each of which is a prism. The prism has an angle greater than or equal to 25° and less than or equal to 90°. The distance between two adjacent light guide structures is greater than or equal to 0 μm and less than or equal to 90 μm. The height of each light guide structure is greater than or equal to 20 μm and less than or equal to 150 μm.

[0015] Under the above conditions, a wide-viewing-angle optical layer can achieve better wide-viewing-angle optical effects. Specifically, at a viewing angle of 60° to the side of the display device (the angle between the viewer's line of sight and the display panel is 30°), the brightness is no less than 1 / 3 of the brightness at a normal viewing angle (the viewer's line of sight is perpendicular to the display panel). This better ensures that people in the wide-viewing-angle area can clearly see the displayed content.

[0016] In some embodiments, at least a portion of the prisms are first prisms, the first prism has an angle of 48°, the width of the first prism is 50 μm, and the spacing between two adjacent light guide structures is 4 μm.

[0017] Under the above conditions, not only can an optical effect be achieved where the brightness is no less than 1 / 3 of the brightness at a 60° angle to the side of the display device, but the following optical effects can also be further obtained: less brightness loss at the direct viewing angle; and more uniform brightness variation from the direct viewing angle area to the wide viewing angle area.

[0018] In some embodiments, some of the prisms are first prisms, and the remaining prisms are second prisms. The first prisms and the second prisms are arranged alternately. The facet angle of the second prism is 48°, and the width of the second prism is 45μm.

[0019] Under the above conditions, not only can the brightness be no less than 1 / 3 of the brightness at a 60° angle to the side of the display device, but the brightness loss at the normal angle is also small, and the brightness change from the normal angle area to the wide angle area is more uniform, the optical effects are also beneficial to eliminating moiré patterns, thereby improving the display effect of the display device.

[0020] In some embodiments, at least a portion of the prisms are third prisms, the third prism has an angle of 90°, the width of the third prism is 70 μm, and the spacing between two adjacent light guide structures is 0 μm.

[0021] Under the above conditions, it is also possible to achieve optical effects such as brightness not less than 1 / 3 of the brightness at a viewing angle of 60° to the side of the display device, smaller brightness loss at the viewing angle, and more uniform brightness change from the viewing angle area to the wide viewing angle area.

[0022] In some embodiments, some of the prisms are third prisms, and the remaining prisms are fourth prisms. The third prisms and the fourth prisms are arranged alternately. The edge angle of the fourth prism is 90°, and the width of the fourth prism is 60μm.

[0023] Under the above conditions, not only can the brightness be no less than 1 / 3 of the brightness at a 60° angle to the side of the display device, but the brightness loss at the normal angle is also small, and the brightness change from the normal angle area to the wide angle area is more uniform, the optical effects are also beneficial to eliminating moiré patterns, thereby improving the display effect of the display device.

[0024] An embodiment of the second aspect of this application provides a display device, the display device including a display panel, a first polarizer and a second polarizer, the first polarizer being disposed on the light-incident side of the display panel, and the second polarizer being disposed on the light-emitting side of the display panel, wherein the first polarizer is the polarizer in any of the above embodiments.

[0025] The display device in this embodiment includes a polarizer comprising a polarizing layer and a wide-viewing-angle optical layer, which integrates the wide-viewing-angle film into the polarizer. During the assembly of the display device, once the polarizer is bonded to the display panel, the display device gains the ability to increase the viewing angle. Compared to the assembly process of display devices in related technologies, this eliminates the need for a separate bonding step of the wide-viewing-angle optical film, thereby improving the device efficiency.

[0026] Furthermore, the wide-viewing-angle optical layer of the polarizer includes a light guide layer and a diffusion layer. The refractive index of the diffusion layer is greater than that of the light guide layer. By setting the diffusion layer, more light can enter the wide-viewing-angle area, thereby improving the problem of weak light emitted from the oblique sides of the display device. Moreover, the diffusion layer also allows each color sub-pixel in the display device to have more light entering the wide-viewing-angle area, compensating for brightness at wide viewing angles. After compensation, the brightness difference between different color sub-pixels at wide viewing angles is reduced, thus improving color shift issues at wide viewing angles.

[0027] In addition, the polarizer is located on the light-incident side of the display panel, which means that the wide-viewing-angle optical layer is located on the back side of the display panel and will not be observed by the user. This also reduces the quality requirements for the wide-viewing-angle optical layer.

[0028] In some embodiments, the display device further includes a glass cover and an optical film. The glass cover is located on the side of the second polarizer facing away from the display panel. The second polarizer is connected to the glass cover by optical adhesive or double-sided adhesive. The optical film is located on the side of the first polarizer facing away from the display panel. The first polarizer is connected to the optical film by optical adhesive or double-sided adhesive.

[0029] The glass cover is located on the side of the second polarizer facing away from the display panel. The second polarizer is connected to the glass cover via optical adhesive or double-sided adhesive. The optical film is located on the side of the first polarizer facing away from the display panel, and the first polarizer is connected to the optical film via optical adhesive or double-sided adhesive. This allows the glass cover, second polarizer, display panel, first polarizer, and optical film to form a single component. During the assembly of the display device, this component can be installed as a whole with other structures of the display device. In the assembled display device, the glass cover, second polarizer, display panel, first polarizer, and optical film maintain a good relative positional relationship, allowing each part to perform its function stably, thus giving the above components stable optical performance. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of a polarizer provided in an embodiment of this application (arrows in the figure represent light rays); Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the diffusion layer provided in an embodiment of this application; Figure 4 This is a schematic diagram illustrating the measurement of the brightness of the display device in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a polarizer in a specific embodiment of this application; Figure 6 This is a schematic diagram of the structure of the polarizer in another specific embodiment of this application; Figure 7 A schematic diagram of a display device provided in an embodiment of this application; Figure 8 A schematic diagram of a display device provided in another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a display device provided in another embodiment of this application.

[0031] Explanation of reference numerals in the attached figures: 1. Display device; 2. Luminometer; 10. Display panel; 20. Polarizer; 21. Polarizing layer; 22. Wide-viewing-angle optical layer; 23. Diffusion layer; 231. Substrate; 232. Scattering structure; 24. Light guide layer; 241. Light guide structure; 2411. First prism; 2412. Second prism; 2413. Third prism; 2414. Fourth prism; 30. First polarizer; 31. Second polarizer; 40. Glass cover plate; 50. Optical films; 60. Light source module; 61. LED light-emitting element; 70. Back panel; 80. Reflective sheet; 90. Light guide plate; 100. Double-sided tape; 110. Optical adhesive. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they 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. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "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 according to the specific circumstances.

[0036] In some display devices in related technologies, a wide-viewing-angle optical film is laminated on the light-incident side of the display panel or between the display panel and the glass cover to increase the viewing angle. However, this method affects the assembly efficiency of the display device. In addition, the wide-viewing-angle optical films used in these display devices do not have ideal optical performance at wide viewing angles. Specifically, they fail to adequately address the issue of weak light emitted from the oblique sides of the display device and are prone to color shift at wide viewing angles.

[0037] Based on the above, the applicant proposes the technical solution in this application, specifically a polarizer comprising a polarizing layer and a wide-viewing-angle optical layer, thereby integrating the film layer enabling wide-viewing-angle functionality onto the polarizer. Thus, during the assembly process of the display device, once the polarizer is bonded to the display panel, the display device can possess wide-viewing-angle functionality. Compared to the assembly process in related technologies, this eliminates the need for a separate bonding step of the wide-viewing-angle optical film, thereby improving the device efficiency of the display device.

[0038] In addition, the wide-viewing-angle optical layer of the polarizer includes a light guide layer and a diffusion layer. The refractive index of the diffusion layer is greater than that of the light guide layer. By setting the diffusion layer, more light can enter the wide-viewing-angle area, thereby improving the problem of weak light emitted by the display device to the side.

[0039] Furthermore, the diffuser layer allows each color sub-pixel in the display device to emit more light into the wide viewing angle area, thus compensating for the brightness under wide viewing angles. After compensation, the brightness difference between different color sub-pixels under wide viewing angles will be reduced, thereby improving the color shift problem under wide viewing angles.

[0040] The above is the core idea of ​​this application. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] like Figure 1 , Figure 2As shown, an embodiment of the first aspect of this application provides a polarizer 20, which includes a polarizing layer 21 and a wide-viewing-angle optical layer 22. The wide-viewing-angle optical layer 22 is disposed on one side of the polarizer 20 and includes a diffusion layer 23 and a light guide layer 24. The diffusion layer 23 is located between the light guide layer 24 and the polarizing layer 21, and the refractive index of the diffusion layer 23 is greater than the refractive index of the light guide layer 24.

[0042] The display device 1 to which the polarizer 20 in this embodiment is applicable includes a display panel 10 and a light source module 60. The display panel 10 is a liquid crystal display panel, and the light source module 60 is used to provide backlight for the display panel 10. The light source module 60 may include a plurality of LED light-emitting elements 61.

[0043] The wide-view optical layer 22 includes a diffusion layer 23 and a light guide layer 24. The light guide layer 24 may include multiple light guide structures 241. For example, the light guide structure 241 may be a prism in the shape of a prism or a strip structure with an irregular cross-sectional shape, as long as it has the function of changing the light path.

[0044] The wide-viewing-angle optical layer 22 expands the viewing angle based on the principle that the refraction angle increases when light enters a denser medium from a less dense medium. In this scheme, light enters the light guide layer 24 from the air and is refracted at the interface between the light guide layer 24 and the air, thereby expanding the propagation angle of the light. Then, it enters the diffusion layer 23, where it is refracted again at the interface between the diffusion layer 23 and the light guide layer 24, further expanding the exit angle. This achieves the effect of increasing the viewing angle.

[0045] In related technologies, display devices with wide-viewing-angle optical films are prone to color shift at wide viewing angles. This is because, as the viewing angle increases, the brightness of each color sub-pixel in the display panel decreases, but the degree of decrease varies among different color sub-pixels. This results in brightness differences between sub-pixels of different colors at wide viewing angles, thus causing color shift.

[0046] The polarizer 20 in this embodiment includes a polarizing layer 21 and a wide-viewing-angle optical layer 22, which integrates the film layer realizing the wide-viewing-angle function into the polarizer 20. During the assembly of the display device 1, after the process of bonding the polarizer 20 to the display panel 10 is completed, the display device 1 can have the function of increasing the viewing angle. Compared with the assembly process of display devices in related technologies, the process of separately bonding the wide-viewing-angle optical film is saved, thereby improving the device efficiency of the display device 1.

[0047] Furthermore, the wide-viewing-angle optical layer 22 of the polarizer 20 includes a light guide layer 24 and a diffusion layer 23. The refractive index of the diffusion layer 23 is greater than that of the light guide layer 24. By setting the diffusion layer 23, more light can enter the wide-viewing-angle region, thereby improving the problem of weak light emitted from the display device 1 at the oblique side. Moreover, the setting of the diffusion layer 23 also allows each color sub-pixel in the display device 1 to have more light entering the wide-viewing-angle region, thus compensating for brightness at wide viewing angles. After compensation, the brightness difference between different color sub-pixels at wide viewing angles will be reduced, thereby improving the color shift problem at wide viewing angles.

[0048] like Figure 1 , Figure 3 As shown, in some embodiments, the diffusion layer 23 includes a substrate 231 and a plurality of scattering structures 232 distributed on the substrate 231. The refractive index of the scattering structures 232 is not equal to the refractive index of the substrate 231. The refractive index of the substrate 231 is greater than the refractive index of the light guide layer 24, and the refractive index of the scattering structures 232 is greater than the refractive index of the light guide layer 24.

[0049] The scattering structure 232 is a structure that scatters light, and the substrate 231 is a film layer that supports the scattering structure 232. The scattering structure 232 can be dispersed in the substrate 231 through various processes. For example, the scattering structure 232 can be mixed into the material used to form the substrate 231, so that after the substrate 231 is formed, the scattering structure 232 is dispersed in the substrate 231. Alternatively, the scattering structure 232 can be formed on the surface of the substrate 231 after the substrate 231 is formed by photolithography, spraying, or other methods.

[0050] A scattering structure 232 is provided in the substrate 231. Through the scattering effect of the scattering structure 232, a diffusion layer 23 with a light diffusion effect can be formed. In addition, the refractive index of the substrate 231 and the refractive index of the scattering structure 232 are both greater than the refractive index of the light guide layer 24. This makes the overall refractive index of the diffusion layer 23 greater than that of the light guide layer 24, thereby increasing the light emission angle and enabling the wide-viewing-angle optical layer 22 to increase the viewing angle.

[0051] Furthermore, the wide-view optical layer 22 can be formed by coating. For example, a substrate 231 material is coated on one side of the polarizing layer 21, wherein the scattering structure 232 is mixed in the substrate 231 material, thereby forming a diffusion layer 23. Then, a light guide layer 24 material (e.g., UV adhesive) is coated on the diffusion layer 23, and a light guide structure 241 is imprinted on the light guide layer 24 material using a mold. After the material cures, a light guide layer 24 including multiple light guide structures 241 is formed.

[0052] In some embodiments, the refractive index of the light guide layer 24 is greater than or equal to 1.44 and less than or equal to 1.57, the refractive index of the substrate 231 is greater than or equal to 1.60 and less than or equal to 1.72, and the refractive index of the scattering structure 232 is greater than or equal to 1.60 and less than or equal to 1.72.

[0053] This configuration satisfies the requirement that the overall refractive index of the diffusion layer 23 is greater than that of the light guide layer 24, thereby increasing the light emission angle. Furthermore, extensive testing has verified that, given the refractive indices of the substrate 231, the scattering structure 232, and the light guide layer 24 meet the aforementioned conditions, the display device 1 can achieve an increased viewing angle without causing excessively low brightness at the normal viewing angle.

[0054] In one embodiment, the scattering structure 232 is a scattering particle with a diameter greater than or equal to 100 nm and less than or equal to 500 nm.

[0055] The shape of the scattering particles can be spherical, ellipsoidal, polyhedral, etc.

[0056] When the diameter of the scattering particles is greater than or equal to 100 nm and less than or equal to 500 nm, the scattering particles can achieve better scattering effect, thereby enabling the diffusion layer 23 to achieve better diffusion effect.

[0057] like Figure 1 As shown, in some embodiments, the light guide layer 24 includes a plurality of light guide structures 241, each of which is a prism. The prism has an angle α greater than or equal to 25° and less than or equal to 90°. The distance L between two adjacent light guide structures 241 is greater than or equal to 0 μm and less than or equal to 90 μm. The height H of the light guide structure 241 is greater than or equal to 20 μm and less than or equal to 150 μm.

[0058] Extensive testing has verified that, under the aforementioned conditions, the wide-viewing-angle optical layer 22 can achieve better wide-viewing-angle optical effects. Specifically, at a 60° angle to the side of the display device 1 (the angle between the viewer's line of sight and the display surface of the display panel 10 is 30°), the brightness is no less than one-third of the brightness at a normal viewing angle (the viewer's line of sight is perpendicular to the display surface of the display panel 10). This better ensures that people in the wide-viewing-angle area can clearly see the displayed content of the display device 1.

[0059] Please refer to the following: Figure 4The brightness of display device 1 at different viewing angles can be measured using a luminance meter 2 (e.g., Konica Minolta CS2000 luminance meter, Topcon BM-7 luminance meter, etc.). Specifically, the luminance meter 2 can be placed directly in front of display device 1, with the optical axis of the lens in the luminance meter 2 perpendicular to the display surface, thus obtaining the brightness of display device 1 at a second viewing angle. Alternatively, the luminance meter can be placed at an angle to the side of display device 1, with the optical axis of the lens in the luminance meter forming a 30° angle with the display surface, thus obtaining the brightness of display device 1 at a first viewing angle.

[0060] It should be noted that, Figure 1 The diagram shows the cross-section of the light guide structure 241. Figure 1 In the embodiment shown, the cross-sectional shape of the light guide structure 241 is triangular, indicating that the corresponding light guide structure 241 is a prism structure. The prism structure has two light-incident surfaces and one light-outceasing surface, with the light-outceasing surface bonded to the diffusion layer 23. An angle α is formed between the two light-incident surfaces. Of course, in other embodiments, the cross-section of the light guide structure 241 can also be other shapes, such as trapezoidal, polygonal, etc.

[0061] It is understood that the light guide structure 241 has an extension direction, wherein, when the light guide structure 241 is a prism, the extension direction of the light guide structure 241 is consistent with the extension direction of the prism's edge.

[0062] like Figure 5 As shown, in one embodiment, at least a portion of the prism is a first prism 2411, the first prism 2411 has an angle of 48°, the width of the first prism 2411 is 50μm, and the spacing L between two adjacent light guide structures 241 is 4μm.

[0063] Further experimental verification showed that, under the above conditions, not only can the optical effect of brightness not less than 1 / 3 of the brightness at a 60° angle to the side of the display device 1 be obtained, but the following optical effects can also be obtained: (1) the brightness loss at the normal viewing angle is small; (2) the brightness change is more uniform from the normal viewing angle area to the wide viewing angle area.

[0064] Specifically, the applicant conducted comparative tests on two scenarios: a display device with a DOPP optical film (a composite film of a diffusion film and two prism films), and a display device 1 with a polarizer 20 including a wide-viewing-angle optical layer 22 as described in this embodiment. The aim was to study the effect of replacing the DOPP optical film in the display device with the wide-viewing-angle optical layer 22 of this embodiment. The test results showed that after replacing the DOPP optical film with the wide-viewing-angle optical layer 22 of this embodiment, the optical loss at the positive viewing angle was less than 25%. Compared to wide-viewing-angle optical films in related technologies, the optical loss at the positive viewing angle was significantly reduced.

[0065] In addition, the applicant tested the brightness change of the display device 1 under different viewing angles after applying the polarizer 20 including the wide-viewing-angle optical layer 22 in this embodiment. The test results showed that the increase in viewing angle and the decrease in brightness generally conformed to a linear law. This means that the brightness change is relatively uniform from the normal viewing angle area to the wide-viewing-angle area, which helps to eliminate the abruptness of visual changes for people.

[0066] like Figure 5 As shown, in one embodiment, some prisms are first prisms 2411 and the rest are second prisms 2412. The first prisms 2411 and the second prisms 2412 are arranged alternately. The edge angle of the second prism 2412 is 48° and the width of the second prism 2412 is 45μm.

[0067] It is understandable that when the angle of the second prism 2412 is equal to that of the first prism 2411, and the width of the second prism 2412 is less than the width of the first prism 2411, the height of the second prism 2412 is also less than the height of the first prism 2411.

[0068] Under the above conditions, not only can the brightness be no less than 1 / 3 of the brightness at a 60° angle to the side of the display device 1, but also the brightness loss at the normal angle is small, and the brightness change from the normal angle area to the wide angle area is more uniform, etc., it is also beneficial to eliminate moiré patterns, thereby improving the display effect of the display device 1.

[0069] like Figure 6 As shown, in one embodiment, at least a portion of the prism is a third prism 2413, the third prism 2413 has an angle of 90°, a width of 70 μm, and a spacing of 0 μm between two adjacent light guide structures 241.

[0070] Further testing and verification showed that, under the above conditions, the brightness at a 60° angle to the side of display device 1 is no less than 1 / 3 of the brightness at a normal viewing angle, with less brightness loss at the normal viewing angle and a more uniform brightness variation from the normal viewing angle to the wide viewing angle. The verification method for these optical effects is the same as described above and will not be repeated here.

[0071] like Figure 6 As shown, in one embodiment, some prisms are third prisms 2413 and the remaining prisms are fourth prisms 2414. The third prisms 2413 and fourth prisms 2414 are arranged alternately. The edge angle of the fourth prism 2414 is 90° and the width of the fourth prism 2414 is 60μm.

[0072] It is understandable that when the angle of the fourth prism 2414 is equal to that of the third prism 2413, and the width of the fourth prism 2414 is less than the width of the third prism 2413, the height of the fourth prism 2414 is also less than the height of the third prism 2413.

[0073] Under the above conditions, not only can the brightness be no less than 1 / 3 of the brightness at a 60° angle to the side of the display device 1, but also the brightness loss at the normal angle is small, and the brightness change from the normal angle area to the wide angle area is more uniform, etc., it is also beneficial to eliminate moiré patterns, thereby improving the display effect of the display device 1.

[0074] like Figure 1 , Figure 2 As shown, an embodiment of the second aspect of this application provides a display device 1, which includes a display panel 10, a first polarizer 30 and a second polarizer 31. The first polarizer 30 is disposed on the light-incident side of the display panel 10, and the second polarizer 31 is disposed on the light-emitting side of the display panel 10. The first polarizer 30 is the polarizer 20 in any of the above embodiments.

[0075] For example, the display device 1 can be a commercial display conference terminal, interactive flat panel, monitor, television, or other device with display function.

[0076] The display device 1 in this embodiment includes a polarizer 20 comprising a polarizing layer 21 and a wide-viewing-angle optical layer 22, which integrates the film layer realizing the wide-viewing-angle function into the polarizer 20. During the assembly of the display device 1, after the process of bonding the polarizer 20 to the display panel 10 is completed, the display device 1 can have the function of increasing the viewing angle. Compared with the assembly process of display devices in related technologies, the process of separately bonding the wide-viewing-angle optical film is saved, thereby improving the device efficiency of the display device 1.

[0077] Furthermore, the wide-viewing-angle optical layer 22 of the polarizer 20 includes a light guide layer 24 and a diffusion layer 23. The refractive index of the diffusion layer 23 is greater than that of the light guide layer 24. By setting the diffusion layer 23, more light can enter the wide-viewing-angle region, thereby improving the problem of weak light emitted from the display device 1 at the oblique side. Moreover, the setting of the diffusion layer 23 also allows each color sub-pixel in the display device 1 to have more light entering the wide-viewing-angle region, thus compensating for brightness at wide viewing angles. After compensation, the brightness difference between different color sub-pixels at wide viewing angles will be reduced, thereby improving the color shift problem at wide viewing angles.

[0078] In addition, the polarizer 20 is located on the light-incident side of the display panel 10, which makes the wide-viewing-angle optical layer 22 located on the back side of the display panel 10 and not visible to the user. This also reduces the quality requirements for the wide-viewing-angle optical layer 22.

[0079] like Figure 1 , Figure 7 as well as Figure 8 As shown, in some embodiments, the display device 1 further includes a glass cover plate 40 and an optical film 50. The glass cover plate 40 is located on the side of the second polarizer 31 facing away from the display panel 10, and the second polarizer 31 is connected to the glass cover plate 40 by optical adhesive 110 or double-sided adhesive 100. The optical film 50 is located on the side of the first polarizer 30 facing away from the display panel 10, and the first polarizer 30 is connected to the optical film 50 by optical adhesive 110 or double-sided adhesive 100.

[0080] The glass cover 40 is typically made of high-strength tempered glass. The optical film 50 is a film with specific optical functions; for example, the optical module may include at least one of a brightness enhancement film or a DBEF (Double Brightness Enhancing Film).

[0081] In this embodiment, the glass cover plate 40 is located on the side of the second polarizer 31 facing away from the display panel 10. The second polarizer 31 is connected to the glass cover plate 40 by optical adhesive 110 or double-sided adhesive 100. The optical film 50 is located on the side of the first polarizer 30 facing away from the display panel 10. The first polarizer 30 is connected to the optical film 50 by optical adhesive 110 or double-sided adhesive 100. This allows the glass cover plate 40, the second polarizer 31, the display panel 10, the first polarizer 30, and the optical film 50 to form a single component. During the assembly of the display device 1, this component can be installed as a whole with other structures of the display device 1. In the assembled display device 1, the glass cover plate 40, the second polarizer 31, the display panel 10, the first polarizer 30, and the optical film 50 can maintain a good relative positional relationship, allowing each part to perform its function relatively stably, thereby giving the above components stable optical performance.

[0082] It is understandable that, in the case where the second polarizer 31 is connected to the glass cover plate 40 by double-sided adhesive 100 (please refer to...), Figure 8 The double-sided adhesive 100 can be located in the peripheral area of ​​the second polarizer 31, thereby avoiding the display area of ​​the display panel 10 and preventing interference with the light emission of the display panel 10. When the second polarizer 31 is connected to the glass cover plate 40 by optical adhesive 110 (see [reference needed]). Figure 7 Since the optical adhesive 110 has good transmittance, it can cover the entire surface of the second polarizer 31 on the side near the glass cover plate 40.

[0083] Similarly, when the first polarizer 30 is connected to the optical film 50 via double-sided adhesive 100 (see reference...) Figure 8 The double-sided adhesive 100 can be located in the peripheral area of ​​the first polarizer 30, thereby avoiding the display area of ​​the display panel 10 and preventing interference with the light incident on the display panel 10. When the first polarizer 30 is connected to the glass cover plate 40 by optical adhesive 110 (see reference...), Figure 7 Since the optical adhesive 110 has good transmittance, it can cover the entire surface of the first polarizer 30 on the side close to the optical film 50.

[0084] like Figure 1 , Figure 9 As shown, in some embodiments, the display device 1 further includes a light source module 60, a back plate 70, and a reflective sheet 80. The back plate 70 is disposed on the side of the optical film 50 away from the glass cover plate 40, and the reflective sheet 80 is disposed on the side of the back plate 70 close to the optical film 50. The light source module 60 is used to provide backlight for the display panel 10, and the reflective sheet 80 is used to reflect the light emitted by the light source module 60 to the optical film 50.

[0085] The light source module 60 can be configured as either direct-lit or side-lit.

[0086] Please refer to Figure 1 When the light source module 60 adopts a direct-lit configuration, the LED light-emitting elements 61 in the light source module 60 are arranged in a matrix on the reflector 80, and the light emitted by the LED light-emitting elements 61 can be directly emitted in the direction of the display panel 10.

[0087] Please refer to Figure 9 When the light source module 60 adopts a side-entry configuration, the display device 1 also includes a light guide plate 90. The light guide plate 90 is located between the reflective sheet 80 and the optical film 50. The LED light-emitting element 61 in the light source module 60 is disposed on the outer periphery of the light guide plate 90. The light emitted by the LED light-emitting element 61 enters the light guide plate 90 and is emitted in the direction of the display panel 10 under the guidance of the light guide plate 90.

[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A polarizing sheet, characterized by, include: Polarizing layer; A wide-viewing-angle optical layer is disposed on one side of the polarizer. The wide-viewing-angle optical layer includes a diffusion layer and a light guide layer. The diffusion layer is located between the light guide layer and the polarizer. The refractive index of the diffusion layer is greater than that of the light guide layer.

2. The polarizing sheet according to claim 1, wherein The diffusion layer includes a substrate and a plurality of scattering structures distributed on the substrate. The refractive index of the scattering structures is not equal to the refractive index of the substrate. The refractive index of the substrate is greater than the refractive index of the light guide layer, and the refractive index of the scattering structures is greater than the refractive index of the light guide layer.

3. The polarizer according to claim 2, characterized in that, The refractive index of the light guide layer is greater than or equal to 1.44 and less than or equal to 1.57, the refractive index of the substrate is greater than or equal to 1.60 and less than or equal to 1.72, and the refractive index of the scattering structure is greater than or equal to 1.60 and less than or equal to 1.

72. And / or, the scattering structure is a scattering particle, the diameter of which is greater than or equal to 100 nm and less than or equal to 500 nm.

4. The polarizer according to claim 1, characterized in that, The light guide layer includes multiple light guide structures, each of which is a prism. The prism has an angle greater than or equal to 25° and less than or equal to 90°. The distance between two adjacent light guide structures is greater than or equal to 0 μm and less than or equal to 90 μm. The height of each light guide structure is greater than or equal to 20 μm and less than or equal to 150 μm.

5. The polarizer according to claim 4, characterized in that, At least a portion of the prisms are first prisms, the first prisms have an angle of 48°, the width of the first prisms is 50 μm, and the spacing between two adjacent light-guiding structures is 4 μm.

6. The polarizer according to claim 5, characterized in that, Some of the prisms are first prisms, and the rest are second prisms. The first prisms and second prisms are arranged alternately. The edge angle of the second prism is 48° and the width of the second prism is 45μm.

7. The polarizer according to claim 4, characterized in that, At least a portion of the prisms are third prisms, the third prisms have an angle of 90°, the width of the third prisms is 70 μm, and the spacing between two adjacent light-guiding structures is 0 μm.

8. The polarizer according to claim 7, characterized in that, Some of the prisms are third prisms, and the rest are fourth prisms. The third prisms and the fourth prisms are arranged alternately. The edge angle of the fourth prism is 90° and the width of the fourth prism is 60μm.

9. A display device, characterized in that, include: Display panel; A first polarizer is disposed on the light-incident side of the display panel; The second polarizer is disposed on the light-emitting side of the display panel; Wherein, the first polarizer is the polarizer according to any one of claims 1 to 8.

10. The display device according to claim 9, characterized in that, The display device further includes: A glass cover plate, the glass cover plate being located on the side of the second polarizer facing away from the display panel, the second polarizer being connected to the glass cover plate by optical adhesive or double-sided adhesive; An optical film is located on the side of the first polarizer away from the display panel, and the first polarizer is connected to the optical film by optical adhesive or double-sided adhesive.

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