Microstructure layer and display device

Abstract

The embodiment of the invention provides a microstructure layer and a display device. The microstructure layer comprises a first refracting layer and a second refracting layer which are arranged along a first direction, and the first refracting layer and the second refracting layer are different in refractive index; imprint and filling pieces are arranged at the junction of the first refraction layer and the second refraction layer, in the second direction, the imprint and the filling pieces are arranged at intervals, and the second direction is perpendicular to the first direction; wherein the refractive index of the imprint is the same as the refractive index of the first refraction layer or the second refraction layer, the refractive index of the filling piece is the same as the refractive index of the first refraction layer or the second refraction layer, and the refractive index of the imprint is different from that of the filling piece. According to the technical scheme, the color cast under the squint angle in the display device can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a microstructure layer and a display device. Background Art

[0002] Among human sensory organs, the eye, as the visual organ, receives the most information. In production and life, people need to make more and more use of rich visual information. Therefore, display technology plays a very important role in today's human society. Since the emergence of display technology to date, the technology has developed very rapidly. With the development of society and the continuous improvement of human's material life needs, today's display technology is rapidly moving towards high contrast, high resolution, full-color display, low power consumption, high reliability, long life, and being light and thin.

[0003] Among them, Organic Light-Emitting Diode (OLED) display devices have received more and more attention due to their advantages such as self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, strong bending resistance, and low power consumption, and are also regarded as the next-generation dream display technology. However, OLED display devices generally have viewing angle deviation. How to solve this problem is a major challenge in the current development of OLEDs. Summary of the Invention

[0004] In view of the above problems, embodiments of the present application provide a microstructure layer and a display device, which can improve the oblique viewing angle deviation of OLED display devices.

[0005] A first aspect of the present application provides a microstructure layer, including a first refractive layer and a second refractive layer arranged along a first direction, and the refractive indices of the first refractive layer and the second refractive layer are different; an imprinting and filling member is disposed at the junction of the first refractive layer and the second refractive layer, and in a second direction perpendicular to the first direction, the imprinting and the filling member are arranged at intervals; wherein, the refractive index of the imprinting is the same as that of the first refractive layer or the second refractive layer, the refractive index of the filling member is the same as that of the first refractive layer or the second refractive layer, and the refractive indices of the imprinting and the filling member are different.

[0006] In the embodiments of the present application, the microstructure layer includes a first refractive layer and a second refractive layer with different refractive indexes, and at the junction of the first refractive layer and the second refractive layer, imprints and fillers are formed at intervals in the second direction; wherein, the refractive index of the imprint is consistent with the refractive index of the first refractive layer or the second refractive layer, and the refractive index of the filler is also consistent with the refractive index of the first refractive layer or the second refractive layer, but the refractive indexes of the imprint and the filler are different. By providing a microstructure layer including a first refractive layer and a second refractive layer with different refractive indexes and having imprints and fillers arranged at intervals at the junction between the two, the dependence of the emission spectrum on the viewing angle change can be reduced, thereby improving the color shift phenomenon at large viewing angles.

[0007] In a possible implementation manner, the refractive index of the first refractive layer is 1.45 - 1.9, and the refractive index of the second refractive layer is 1.3 - 1.6.

[0008] In the embodiments of the present application, by defining the refractive index of the first refractive layer as 1.45 - 1.9 and the refractive index of the second refractive layer as 1.3 - 1.6, the refractive indexes of the imprint and the filler are also defined. Keeping the refractive index within this range can change the direction of the outgoing light path, redistribute the viewing angle light rays into a new spectrum, and the newly formed spectral morphology is closer to the peak appearance at the normal viewing angle, thereby further improving the color shift phenomenon at large viewing angles.

[0009] In a possible implementation manner, the ratio of the size of the imprint in the first direction to the size in the second direction is greater than or equal to 1.4.

[0010] In the embodiments of the present application, the size of the imprint in the first direction is the height, and the size in the second direction is the width. The aspect ratio design of the imprint in the microstructure layer has an obvious influence on color improvement. The larger the aspect ratio value, the higher the color improvement efficiency, and the better the performance of the large viewing angle color shift. By making the ratio of the size of the imprint in the first direction to the size in the second direction greater than or equal to 1.4, the color shift at the oblique viewing angle can be further improved.

[0011] In a possible implementation manner, the imprint has a concave carving pattern, and the ratio of the area of the concave carving pattern to the area of the imprint is greater than or equal to 0.35.

[0012] In the embodiments of the present application, the pattern density on the imprint has a significant influence on the color improvement rate. Generally, the larger the pattern density on the imprint, the larger the proportion of the components participating in the light path refraction, the greater the degree of adjustment of the light path, and thus the relatively better the improvement effect of the color difference. Therefore, by making the area ratio of the concave carving pattern on the imprint not less than 35%, the color shift phenomenon at the oblique viewing angle can be further improved.

[0013] In a possible implementation, the imprinted topography includes at least one of a rectangle, a trapezoid, a triangle, and an ellipse.

[0014] In a possible implementation, the microstructure layer includes a plurality of the first refractive layers and a plurality of the second refractive layers; in the first direction, the plurality of the first refractive layers and the plurality of the second refractive layers are arranged at intervals.

[0015] In the embodiments of the present application, the first refractive layer and the second refractive layer in the microstructure layer can have multiple layers, and the first refractive layer and the second refractive layer can be stacked in different stacking manners, so that the microstructure layer can be installed according to the assembly requirements, which helps to improve the flexibility of installing the microstructure layer.

[0016] In a possible implementation, the microstructure layer further includes a first substrate; in the first direction, the first substrate is disposed above the first refractive layer and the second refractive layer, and the material of the first substrate includes at least one of cellulose triacetate, polyethylene terephthalate, ultra-thin flexible glass, transparent polyimide, polymethyl methacrylate, or cycloolefin polymer.

[0017] In the embodiments of the present application, by providing the first substrate in the microstructure layer and disposing it above the first refractive layer and the second refractive layer, it can play a role in supporting the microstructure layer.

[0018] A second aspect of the present application provides a display device, which includes the microstructure layer according to any one of the embodiments in the first aspect of the present application; the display device includes a substrate, a driving circuit layer on one side of the substrate, an electroluminescent layer on the side of the driving circuit layer away from the substrate, and the microstructure layer on the side of the electroluminescent layer away from the substrate.

[0019] In a possible implementation, the display device further includes a black matrix, and the black matrix is disposed below the microstructure layer.

[0020] In the embodiments of the present application, disposing the microstructure layer above the black matrix can slow down the dependence of the emission spectrum on the change of the viewing angle, thereby improving the color shift phenomenon.

[0021] In a possible implementation, the display device further includes a cover plate and a composite circular polarizer, and the cover plate is located above the composite circular polarizer; wherein, the microstructure layer is located above the cover plate; or the microstructure layer is located between the cover plate and the composite circular polarizer; or the microstructure layer is located below the composite circular polarizer.

[0022] In a possible implementation, when the microstructure layer is located between the cover plate and the composite circular polarizer, the microstructure layer is located in a first region corresponding to the opening region of the black matrix, or in a second region corresponding to the non-opening region of the black matrix.

[0023] In the embodiments of the present application, by providing a microstructure layer in the display device, the color shift at an oblique viewing angle can be improved. There are multiple choices for the position of the microstructure layer, so that the position of the microstructure layer can be selected according to the actual production process.

[0024] In a possible implementation, the composite circular polarizer includes a circular polarizer body and a brightness enhancement film, and the brightness enhancement film is disposed below the circular polarizer body; wherein, the material of the brightness enhancement film includes cholesteric liquid crystal, and the central wavelength of the reflection light spectrum of the brightness enhancement film is 450 nm - 480 nm.

[0025] In the embodiments of the present application, the central wavelength of the reflection light spectrum of the brightness enhancement film is 450 nm - 480 nm, that is, the brightness enhancement film is a blue light brightness enhancement film. The principle of blue light enhancement is that when the blue light emitted from the display screen panel encounters the brightness enhancement film made of cholesteric liquid crystal material, the light emitted from the panel can be decomposed into about 50% right-handed light and about 50% left-handed light; 50% of the right-handed light penetrates the brightness enhancement film and then normally exits the display module, and 50% of the left-handed light is reflected back to the panel, and becomes right-handed light after being reflected by the panel, and then penetrates the brightness enhancement film and exits the display module. Therefore, by providing a brightness enhancement film made of cholesteric liquid crystal and having a reflection central wavelength of 450 nm - 480 nm below the circular polarizer body, that is, integrating the circular polarizer body and the brightness enhancement film as a composite circular polarizer, it can be used in the display device to improve the light extraction efficiency of blue light, and thus can not only improve the color shift at an oblique viewing angle of the display device, but also improve the brightness attenuation rate at an oblique viewing angle.

[0026] In a possible implementation, the full width at half maximum of the reflection light spectrum of the brightness enhancement film is 5 nm - 80 nm.

[0027] In the embodiments of the present application, by making the full width at half maximum of the reflection light spectrum of the brightness enhancement film be 5 nm - 80 nm, the light extraction brightness can be further increased, the reflectivity can be reduced, and the dark state can be reduced.

[0028] In a possible implementation, the thickness of the brightness enhancement film is less than or equal to 5 μm.

[0029] In the embodiments of the present application, if the thickness of the brightness enhancement film is too high, it is not conducive to spectral emission and is also not conducive to the bending of the display device. Therefore, the thickness of the brightness enhancement film is maintained at not more than 5 μm.

[0030] In a possible implementation, the circular polarizer body includes a first substrate, a linear polarizer, a half-wave plate film layer, and a quarter-wave plate film layer arranged in sequence from top to bottom; wherein, the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer is 15°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer is 75°; or the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer is 105° or 285°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer is 165° or 345°.

[0031] In the embodiments of the present application, by making the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer be 15°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer be 75°, at this time, the brightness enhancement film is a left-handed cholesteric liquid crystal; by making the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer be 105° or 285°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer be 165° or 345°, at this time, the brightness enhancement film is a right-handed cholesteric liquid crystal. As the brightness enhancement film, both the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal can improve the light extraction efficiency of blue light, and thus can not only improve the color shift under the oblique viewing angle of the display device, but also improve the brightness attenuation rate under the oblique viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the drawings.

[0033] Figure 1 It is a schematic structural diagram of the microstructure layer according to an embodiment of the present application;

[0034] Figure 2 It is a partial view of the microstructure layer according to an embodiment of the present application;

[0035] Figure 3 It is a schematic structural diagram of the microstructure layer according to another embodiment of the present application;

[0036] Figure 4 It is a partial view of the microstructure layer according to another embodiment of the present application;

[0037] Figure 5 It is a partial view of the microstructure layer according to still another embodiment of the present application;

[0038] Figure 6Partial view of the microstructure layer according to another embodiment of the present application;

[0039] Figure 7 Schematic structural view of the microstructure layer according to still another embodiment of the present application;

[0040] Figure 8 Schematic structural view of the microstructure layer according to another embodiment of the present application;

[0041] Figure 9 Schematic structural view of the microstructure layer according to another embodiment of the present application;

[0042] Figure 10 Schematic structural view of a display device according to an embodiment of the present application;

[0043] Figure 11 Schematic structural view of a display device according to another embodiment of the present application;

[0044] Figure 12 Schematic structural view of a display device according to still another embodiment of the present application;

[0045] Figure 13 Schematic structural view of a display device according to another embodiment of the present application;

[0046] Figure 14 Schematic view of the function of a composite circular polarizer according to an embodiment of the present application;

[0047] Figure 15 Schematic structural view of a display device according to another embodiment of the present application.

[0048] Reference numerals:

[0049] 100 - Microstructure layer, 101 - First substrate, 102 - First refractive layer, 103 - Second refractive layer, 1041 - Imprinting, 1042 - Filler, 1043 - Intaglio pattern, 110 - Repairable adhesive layer, 301 - Cover plate, 304 - Black matrix, 305 - Touch layer, 306 - Sealing layer, 307 - Electroluminescent layer, 401 - Composite circular polarizer, 4011 - Circular polarizer body, 4012 - Brightness enhancement film, 4013 - Second substrate, 4014 - Linear polarizer, 4015 - Half-wave plate film layer, 4016 - Quarter-wave plate film layer, 308 - Driving circuit layer, 309 - Substrate;

[0050] X - First direction, Y - Second direction, W - Width, H - Height. Detailed embodiments

[0051] To make the objectives, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0052] The "ranges" disclosed in this application are defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a specific range. The ranges defined in this way include the endpoint values and can be combined arbitrarily, 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, ranges of 60 - 110 and 80 - 120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5. In this application, unless otherwise specified, the numerical range "a - b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" are fully listed herein, and "0 - 5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0053] If there is no special instruction, all embodiments and optional embodiments of this application can be combined with each other to form new technical solutions.

[0054] If there is no special instruction, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0055] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification and appended claims of this application, the singular forms of expressions such as "a", "an", "the", "above-mentioned", "this", and "such" are also intended to include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of this application, "at least one" and "one or more" mean one, two, or more than two. The term "and / or" is used to describe the association relationship of associated objects and indicates that three relationships can exist; for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0056] References to "one embodiment", "some embodiments", "an embodiment", or "some embodiments" described in this specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc., which appear in different places in this specification, are not necessarily all referring to the same embodiment, but rather mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0057] OLED belongs to a current-type organic light-emitting device, and is a phenomenon of emitting light through the injection and recombination of carriers, and the luminous intensity is proportional to the injected current. Under the action of an electric field in an OLED, holes generated by the anode and electrons generated by the cathode will move, and are respectively injected into the hole transport layer and the electron transport layer, and migrate to the light-emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, which in turn excite the light-emitting molecules to finally generate visible light. OLED display technology has characteristics such as a high color gamut, high contrast ratio, flexible self-luminescence, and low power consumption. It is one of the mainstream information display technologies currently applied to intelligent display ports, and its development direction also hopes to have higher luminous efficiency and lower energy consumption. As a second-generation light-emitting material, phosphorescent light-emitting materials can utilize triplet excitons to emit light and improve the luminous efficiency, and are increasingly used in OLED display technology. However, phosphorescent light-emitting materials, especially blue phosphorescent light-emitting materials, have a relatively large full width at half maximum (FWHM), which will reduce the display color purity. Moreover, in some OLED display devices, blue light is emitted using blue phosphorescent light-emitting materials, and green and red light materials use some fluorescent light-emitting materials. When a user views the display screen at a relatively off-angle, due to the different attenuation degrees of the light generated by the blue phosphorescent light-emitting material with a wider FWHM and the light generated by the fluorescent light-emitting material, a color shift problem will occur.

[0058] In the prior art, a common method to improve the color shift problem in the above-mentioned OLED display panel is to control the current density by adjusting the aperture ratio of each sub-pixel, so that the attenuation curves of the three organic light-emitting materials of red, green, and blue can be adjusted to be basically the same. However, due to the different aperture ratios of each sub-pixel, the manufacturing process of the mask plate is very complicated and it is difficult to guarantee the accuracy; and due to the estimated color shift problem, the overall brightness and service life of the OLED are sacrificed.

[0059] In view of the above problems, the embodiments of the present application provide a microstructure layer and a display device, which can improve the color shift phenomenon at an oblique viewing angle.

[0060] Figure 1The figure is a schematic structural diagram of a microstructure layer according to an embodiment of the present application. As Figure 1 shown, the microstructure layer 100 includes a first refractive layer 102 and a second refractive layer 103 arranged along the first direction X, and the refractive indices of the first refractive layer 102 and the second refractive layer 103 are different.

[0061] The first direction X is the vertical direction of the microstructure layer 100; hereinafter, for convenience of description, the vertical direction of the microstructure layer 100 is taken as the first direction X.

[0062] As Figure 1 shown, the microstructure layer 100 further includes a first substrate 101. The first substrate 101 is a supporting substrate of the microstructure layer 100, and its material can be at least one of tri-cellulose acetate (TAC), polyethylene glycol terephthalate (PET), ultra-thin glass (UTG), colorless polyimide (CPI), polymethyl methacrylate (PMMA), and cyclo olefin polymer (COP).

[0063] The materials of the first refractive layer 102 and the second refractive layer 103 can be PMMA, and the refractive index values of the two can be formulated by adding Zr element component substances; the substances containing Zr element have high refractive index and wide bandgap, good transparency, and low absorption and low scattering characteristics for visible light and infrared bands.

[0064] The refractive indices of the first refractive layer 102 and the second refractive layer 103 are different, so the two have relatively high refractive layer and low refractive layer (the high refractive layer refers to the refractive layer with high refractive index, and the low refractive layer refers to the refractive layer with low refractive index). Among them, it can be that the first refractive layer 102 is the high refractive layer and the second refractive layer 103 is the low refractive layer; it can also be that the first refractive layer 102 is the low refractive layer and the second refractive layer 103 is the high refractive layer.

[0065] Please continue to refer to Figure 1 , an imprint 1041 and a filling member 1042 are provided at the junction of the first refractive layer 102 and the second refractive layer 103. In the second direction Y, the imprint 1041 and the filling member 1042 are arranged at intervals, and the second direction Y is perpendicular to the first direction X.

[0066] As described above, if the first direction X is the vertical direction of the microstructure layer 100, then the second direction Y is the horizontal direction of the microstructure layer 100.

[0067] It should be understood that the imprint 1041 and the filling member 1042 are disposed on the first refractive layer 102 and the second refractive layer 103, that is, with the first refractive layer 102 and the second refractive layer 103 as the substrates.

[0068] It should be understood that the interval setting here is the interval setting of a single imprint 1041 and a single filling member 1042. That is, the specific setting in the second direction Y is: imprint 1041, filling member 1042, imprint 1041, filling member 1042, imprint 1041, filling member 1042...; it can also be filling member 1042, imprint 1041, filling member 1042, imprint 1041, filling member 1042, imprint 1041..., and the present application does not make special limitations on this.

[0069] It should be understood that when setting the imprint 1041 at the junction of the first refractive layer 102 and the second refractive layer 103, nanoimprint technology or other imprint technologies can be used, and the present application also does not make limitations on this.

[0070] Among them, the refractive index of the imprint 1041 is the same as that of the first refractive layer 102 or the second refractive layer 103, the refractive index of the filling member 1042 is the same as that of the first refractive layer 102 or the second refractive layer 103, and the refractive index of the imprint 1041 is different from that of the filling member 1042.

[0071] That is to say, when the refractive index of the imprint 1041 is the same as that of the first refractive layer 102, the refractive index of the filling member 1042 is the same as that of the second refractive layer 103; when the refractive index of the imprint 1041 is the same as that of the second refractive layer 103, the refractive index of the filling member 1042 is the same as that of the first refractive layer 102.

[0072] When the microstructure layer 100 has a first refractive layer 102 and a second refractive layer 103 with different refractive indices arranged along the first direction X, and has imprints 1041 and fillers 1042 arranged at intervals along the second direction Y and also having different refractive indices, the high- and low-refractive index layers and the nanoimprint 1041 can change the direction of the outgoing light path, redistribute the viewing angle light rays into a new spectrum, that is, after passing through the microstructure layer 100, the outgoing light rays can be closer to the positive viewing angle. In addition, through the optical path adjustment of the microstructure layer 100, the light rays of each viewing angle are redistributed, including spectral components from low viewing angles and spectral components from high viewing angles, thereby making the spectral morphology closer to the peak shape of the positive viewing angle. Due to the influence of the microcavity effect, the light intensity of the low viewing angle will be significantly stronger than that of the large viewing angle, and the newly redistributed spectrum will be closer to the peak shape of the low viewing angle. Since the spectrum corresponds one-to-one with the color coordinates, the color can be quantitatively compared, and the changes in the peak position and peak width will cause the color coordinates to shift. Therefore, the spectral morphology after being adjusted by the microstructure layer 100 will be closer to the peak appearance of the positive viewing angle, that is, the changes in the peak position and full width at half maximum have hysteresis, so that the viewing angle-dependent color shift caused by the microcavity effect can be slowed down.

[0073] In the above solution, by providing a microstructure layer 100 including a first refractive layer 102 and a second refractive layer 103 with different refractive indices, and having imprints 1041 and fillers 1042 arranged at intervals at the junction between the two, the dependence of the emission spectrum on the viewing angle change can be slowed down, thereby improving the color shift phenomenon at large viewing angles.

[0074] In some embodiments, the refractive index of the first refractive layer 102 is 1.45 - 1.9, and the refractive index of the second refractive layer 103 is 1.3 - 1.6.

[0075] In the above solution, by limiting the refractive index of the first refractive layer to be 1.45 - 1.9 and the refractive index of the second refractive layer to be 1.3 - 1.6, the refractive indices of the imprints and fillers are also limited. Keeping the refractive index within this range can change the direction of the outgoing light path, redistribute the viewing angle light rays into a new spectrum, and the newly formed spectral morphology is closer to the peak appearance of the positive viewing angle, thereby further improving the color shift phenomenon at large viewing angles.

[0076] Specifically, the refractive index of the first refractive layer 102 can be 1.45, 1.5, 1.6, 1.8, 1.9 or any value within the above range.

[0077] Specifically, the refractive index of the second refractive layer 103 can be 1.3, 1.35, 1.4, 1.5, 1.5 or any value within the above range.

[0078] It should be understood that the first refractive layer 102 and the second refractive layer 103 should take values within the above respective ranges on the basis of satisfying the condition that their refractive indices are different.

[0079] Figure 2 Partial view of the microstructure layer according to an embodiment of the present application. As Figure 2 shown, in some embodiments, the ratio of the dimension of the imprint 1041 in the first direction X to the dimension in the second direction Y is greater than or equal to 1.4.

[0080] As described above, the first direction X is the vertical direction of the microstructure layer 100, which can also be referred to as the height direction of the microstructure layer 100, that is, Figure 2 the direction where H is located in Figure 2 ; the second direction Y is the horizontal direction of the microstructure layer 100, which can also be referred to as the width direction of the microstructure layer 100, that is,

[0081] In the above solution, in the microstructure layer 100, the aspect ratio design of the imprint 1041 has an obvious influence on color improvement. The larger the aspect ratio value, the higher the color improvement efficiency, and the better the performance of large viewing angle color shift. By making the ratio of the dimension of the imprint 1041 in the first direction X to the dimension in the second direction Y not less than 1.4, that is, the aspect ratio is greater than or equal to 1.4, the color shift at an oblique viewing angle can be further improved.

[0082] Specifically, the ratio of the aspect ratios of the imprint 1041 in the first direction X and the second direction Y can be 1.4, 1.5, 1.8, 2.1, 2.5 or any value within the above range.

[0083] Figure 3 Structural schematic diagram of the microstructure layer according to another embodiment of the present application. As Figure 3 shown, in some embodiments, the imprint 1041 has an engraved pattern 1043, and the ratio of the area of the engraved pattern 1043 to the area of the imprint 1041 is greater than or equal to 0.35.

[0084] In the embodiments of the present application, the pattern density on the imprint 1041 has a significant influence on the color improvement rate. Generally, the larger the pattern density on the imprint 1041, the larger the proportion of the components participating in the light path refraction, the greater the degree of adjustment of the light path, and thus the relatively better the improvement effect of the color difference. Therefore, by making the area ratio of the engraved pattern 1043 on the imprint 1041 not less than 35%, the color shift phenomenon at an oblique viewing angle can be further improved.

[0085] The present application does not particularly limit the specific pattern of the engraved pattern 1043. For example, the engraved pattern 1043 can be a rectangle, a trapezoid, etc.

[0086] In some embodiments, the morphology of the imprint 1041 includes at least one of a rectangle, a trapezoid, a triangle, and an ellipse.

[0087] Figures 4 - 6A partial view of the microstructure layer according to some embodiments of the present application. As Figures 4 - 6 shown, the imprint 1041 on the microstructure layer 100 can have various morphologies, and can be Figure 1 a rectangle in Figure 4 an ellipse in Figure 5 an inverted trapezoid in Figure 6 a triangle in

[0088] It should be understood that the imprint 1041 and the filling member 1042 can have the same morphology. For example, as Figure 5 shown, the morphologies of both the imprint 1041 and the filling member 1042 are trapezoids; the imprint 1041 and the filling member 1042 can also have different morphologies. For example, as Figure 6 shown, the morphology of the imprint 1041 is trapezoidal, and the morphology of the filling member 1042 is triangular.

[0089] It should be understood that the morphology of the imprint 1041 represented here refers to the cross-sectional morphology of the imprint 1041.

[0090] Figure 7 A schematic structural view of the microstructure layer according to another embodiment of the present application. As Figure 1 and Figure 7 shown, in some embodiments, in the first direction X, the first refractive layer 102 is located above the second refractive layer 103; or in the first direction X, the second refractive layer 103 is located above the first refractive layer 102.

[0091] Figure 8 and Figure 9 A schematic structural view of the microstructure layer according to some embodiments of the present application. As Figure 8 and Figure 9 shown, the microstructure layer 100 includes a plurality of first refractive layers 102 and a plurality of second refractive layers 103; in the first direction X, the plurality of first refractive layers 102 and the plurality of second refractive layers 103 are arranged at intervals.

[0092] When the microstructure layer 100 includes two second refractive layers 103 and one first refractive layer 102, the specific arrangement in the microstructure layer 100 can be as Figure 8 shown, that is, in the first direction X, the microstructure layer 100 includes, from top to bottom in sequence: a second refractive layer 103, a first refractive layer 102, a second refractive layer 103; the specific arrangement of the microstructure layer 100 from top to bottom can also be: a second refractive layer 103, a second refractive layer 103, a first refractive layer 102; the specific arrangement of the microstructure layer 100 from top to bottom can also be: a first refractive layer 102, a second refractive layer 103, a second refractive layer 103.

[0093] When the microstructure layer 100 includes two layers of the first refractive layer 102 and two layers of the second refractive layer 103, the specific arrangement in the microstructure layer 100 can be as Figure 9 shown. That is, in the first direction X, from top to bottom, the microstructure layer 100 sequentially includes: the first refractive layer 102, the second refractive layer 103, the first refractive layer 102, and the second refractive layer 103; the specific arrangement of the microstructure layer 100 from top to bottom can also be: the first refractive layer 102, the first refractive layer 102, the second refractive layer 103, and the second refractive layer 103. The specific arrangement of the microstructure layer 100 from top to bottom can also be: the second refractive layer 103, the second refractive layer 103, the first refractive layer 102, and the first refractive layer 102.

[0094] That is to say, this application does not particularly limit the specific number of layers of the first refractive layer 102 and the second refractive layer 103 contained in the microstructure layer 100. In addition, as Figure 8 and Figure 9 shown, for the first refractive layer 102 or the second refractive layer 103 located in the middle, embossings 1041 can be provided at both side junctions, or embossings 1041 can be provided at a single side junction. This application also does not limit this.

[0095] In the above solution, the first refractive layer 102 and the second refractive layer 103 in the microstructure layer 100 can have multiple layers, and the first refractive layer 102 and the second refractive layer 103 can be arranged in different arrangements, so that the microstructure layer 100 can be installed according to the assembly requirements.

[0096] Figure 10 is a schematic structural diagram of a display device of this application. As Figure 10 shown, the display device 300 includes a microstructure layer 100, and the microstructure layer 100 is the microstructure layer described in any of the above embodiments; the display device 300 includes a substrate 309, a driving circuit layer 308 on one side of the substrate 309, an electroluminescent layer 307 on the side of the driving circuit layer 308 away from the substrate 309, and a microstructure layer 100 on the side of the electroluminescent layer 307 away from the substrate 309.

[0097] In some embodiments, the display device 300 further includes a black matrix 304, and the black matrix 304 is disposed below the microstructure layer 100.

[0098] It should be understood that different film layers in this application are all connected through an adhesive layer. The adhesive layer can be a UV glue, a pressure-sensitive adhesive, a thermosetting aqueous glue, or other glues commonly used in the OLED assembly process. This application does not limit this. In addition, the adhesive layer may or may not appear in the drawings, which does not affect the structural arrangement in this application and does not affect the scope of this application.

[0099] It should be understood that in the embodiments of the present application, the display device 300 may be a display device such as an OLED display, and any product or component with a display function, such as a television, digital camera, mobile phone, tablet computer, etc., including these display devices.

[0100] In the above solution, the microstructure layer 100 is disposed above the black matrix 304, which can slow down the dependence of the emission spectrum on the viewing angle change, thereby improving the color shift phenomenon.

[0101] In some embodiments, the display device 300 further includes a cover plate 301 and a composite circular polarizer 401. The cover plate 301 is located above the composite circular polarizer 401; wherein, the microstructure layer 100 is located above the cover plate 301; or the microstructure layer 100 is located between the cover plate 301 and the composite circular polarizer 401; or the microstructure layer 100 is located below the composite circular polarizer 401.

[0102] The cover plate 301 is disposed on the upper layer of the composite circular polarizer 401 for protecting the composite circular polarizer 401. The material of the cover plate 301 may be at least one of CPI, PET, or UTG. The cover plate 301 may be multi-layered, that is, it may be two layers or more than two layers. When the cover plate 301 is two layers or more than two layers, the multi-layer cover plate 301 may be of the same material or a combination of different materials.

[0103] As Figure 10 shown, when the display device 300 further includes a cover plate 301 and a composite circular polarizer 401, the microstructure layer 100 is located below the composite circular polarizer 401. The display device 300 may sequentially include, from top to bottom: a cover plate 301, a composite circular polarizer 401, a microstructure layer 100, a black matrix 304, a touch layer 305, a packaging layer 306, an electroluminescent layer 307, a driving circuit layer 308, and a substrate 309.

[0104] The material of the packaging layer 306 is an insulating material, such as silicon nitride, silicon oxide, silicon oxynitride, or aluminum oxide, etc.

[0105] Figure 11 It is a schematic structural diagram of another display device of the present application. As Figure 11As shown, the microstructure layer 100 is located above the cover plate 301. It should be noted here that when the microstructure layer 100 is located at the uppermost part of the display device 300, the microstructure layer 100 can serve as a protective film for the display screen. At this time, to ensure a repair effect, the microstructure layer 100 needs to be used in combination with a repairable adhesive material, that is, a repairable adhesive layer 110 is provided between the microstructure layer 100 and the cover plate 301. Therefore, the display device 300 is sequentially arranged from top to bottom including: the microstructure layer 100, the repairable adhesive layer 110, the cover plate 301, the composite circular polarizer 401, the black matrix 304, the touch layer 305, the sealing layer 306, the electroluminescent layer 307, the driving circuit layer 308, and the substrate 309.

[0106] Figure 12 It is a schematic structural diagram of a display device according to another embodiment of the present application. As Figure 12 shown, the microstructure layer 100 is located between the cover plate 301 and the composite circular polarizer 401. The display device 300 sequentially includes from top to bottom: the cover plate 301, the microstructure layer 100, the composite circular polarizer 401, the black matrix 304, the touch layer 305, the sealing layer 306, the electroluminescent layer 307, the driving circuit layer 308, and the substrate 309.

[0107] Figure 13 It is a schematic structural diagram of a display device according to another embodiment of the present application. As Figure 12 and 13 shown, in some embodiments, when the microstructure layer 100 is located between the cover plate 301 and the composite circular polarizer 401, the microstructure layer 100 is located in a first region corresponding to the opening region 3041 of the black matrix 304, or in a second region 3042 corresponding to the non-opening region of the black matrix 304.

[0108] In the above solution, by providing the microstructure layer 100 in the display device 300, the color shift at an oblique viewing angle can be improved. The position of the microstructure layer 100 has multiple choices, so that the position of the microstructure layer 100 can be selected according to the actual production process.

[0109] In some embodiments, the composite circular polarizer 401 includes a circular polarizer body and a brightness enhancement film, and the brightness enhancement film is disposed below the circular polarizer body; wherein, the material of the brightness enhancement film includes cholesteric liquid crystal, and the central wavelength of the reflection light spectrum of the brightness enhancement film is 450 nm - 480 nm.

[0110] Figure 14 It is a schematic diagram of the function of a composite circular polarizer according to an embodiment of the present application. As Figure 14The central wavelength of the reflected light spectrum of the brightness enhancement film shown is 450 nm - 480 nm, and the material of the brightness enhancement film includes cholesteric liquid crystals (CLC), that is, the brightness enhancement film is a blue light CLC brightness enhancement film. The principle of blue light antireflection is that when the blue light emitted from the panel encounters the brightness enhancement film made of cholesteric liquid crystals, the light emitted from the panel can be decomposed into approximately 50% right-handed light and approximately 50% left-handed light. 50% of the right-handed light penetrates the brightness enhancement film and then normally exits the display module, and 50% of the left-handed light is reflected back to the panel, becomes right-handed light after being reflected by the panel, and then penetrates the brightness enhancement film and exits the display module. Under the drive of the same current, the blue light brightness enhancement efficiency can be maintained at 20% - 40%, which can not only improve the color shift of the display device 300 at an oblique viewing angle, but also improve the brightness attenuation rate at an oblique viewing angle.

[0111] Specifically, the central wavelength of the reflected light spectrum of the brightness enhancement film can be 450 nm, 455 nm, 460 nm, 470 nm, 480 nm, or any value within the above range.

[0112] In some embodiments, the full width at half maximum (FWHM) of the reflected light spectrum of the brightness enhancement film is 5 nm - 80 nm.

[0113] In the embodiments of the present application, by making the FWHM of the reflected light spectrum of the brightness enhancement film be 5 nm - 80 nm, the light output brightness can be further increased, the reflectivity can be reduced, and the dark state can be reduced.

[0114] Specifically, the FWHM of the reflected light spectrum of the brightness enhancement film can be 5 nm, 15 nm, 50 nm, 60 nm, 80 nm, or any value within the above range.

[0115] In some embodiments, the thickness of the brightness enhancement film is less than or equal to 5 μm.

[0116] In the embodiments of the present application, if the thickness of the brightness enhancement film is too high, it is not conducive to spectral light output and is also not conducive to the bending of the display device. Therefore, the thickness of the brightness enhancement film is maintained at less than or equal to 5 μm.

[0117] Specifically, the thickness of the brightness enhancement film can be 5 μm, 4 μm, 3.5 μm, 3 μm, 2 μm, or any value within the above range.

[0118] Figure 15 It is a schematic structural diagram of a display device according to another embodiment. As Figure 15As shown, in a possible implementation, the circular polarizer body 4011 includes a second substrate 4013, a linear polarizer 4014, a half-wave plate film layer 4015, and a quarter-wave plate film layer 4016 arranged in sequence from top to bottom. Among them, the included angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the half-wave plate film layer 4015 is 15°, and the included angle between the absorption axis of the linear polarizer 4014 and the slow axis direction of the quarter-wave plate film layer 4016 is 75°; or the included angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the half-wave plate film layer 4015 is 105° or 285°, and the included angle between the absorption axis of the linear polarizer 4014 and the slow axis direction of the quarter-wave plate film layer 4016 is 165° or 345°.

[0119] The linear polarizer 4014 is an iodine-based stretched linear polarizing functional film, which has the function of converting natural light into linearly polarized light. The linear polarizer 4014 film layer has an absorption axis. The absorption axis generally refers to the direction perpendicular to the surface of the linear polarizer 4014.

[0120] The half-wave plate film layer 4015 contains a fast axis and a slow axis in a plane parallel to the panel. When light waves pass through the half-wave plate film layer 4015, a phase difference of half a wavelength is generated; the quarter-wave plate film layer 4016 includes a fast axis and a slow axis in a plane parallel to the panel. When light waves pass through the quarter-wave plate film layer 4016, a phase difference of a quarter of a wavelength is generated. The slow axis is the direction of the light vector with a slow propagation speed in the wave plate, and the fast axis is the direction of the light vector with a fast propagation speed in the wave plate. The fast axis and the slow axis are perpendicular to each other.

[0121] In the above solution, by making the included angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the half-wave plate film layer 4015 be 15°, and the included angle between the absorption axis of the linear polarizer 4014 and the slow axis direction of the quarter-wave plate film layer 4016 be 75°, at this time, the brightness enhancement film 4012 is a left-handed cholesteric liquid crystal; by making the included angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the half-wave plate film layer 4015 be 105° or 285°, and the included angle between the absorption axis of the linear polarizer 4014 and the slow axis direction of the quarter-wave plate film layer 4016 be 165° or 345°, at this time, the brightness enhancement film 4012 is a right-handed cholesteric liquid crystal. As the brightness enhancement film 4012, both the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal can improve the light extraction efficiency of blue light, and thus can not only improve the color shift under the oblique viewing angle of the display device 300, but also improve the brightness attenuation rate under the oblique viewing angle.

[0122] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments having the same constitution and achieving the same effects as the technical idea within the scope of the technical solution of this application are all included in the technical scope of this application. In addition, within the scope of not departing from the gist of this application, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of this application.

Claims

1. A microstructure layer, characterized in that, Comprising: A first refractive layer and a second refractive layer arranged in a first direction, wherein the refractive indices of the first refractive layer and the second refractive layer are different; An imprinting and filling member is provided at the junction of the first refractive layer and the second refractive layer. In a second direction perpendicular to the first direction, the imprints and the filling members are arranged at intervals; Wherein, the refractive index of the imprint is the same as that of the first refractive layer or the second refractive layer, the refractive index of the filling member is the same as that of the first refractive layer or the second refractive layer, and the refractive indices of the imprint and the filling member are different.

2. The microstructure layer according to claim 1, characterized in that, The refractive index of the first refractive layer is 1.45 - 1.9, and the refractive index of the second refractive layer is 1.3 - 1.

6.

3. The microstructure layer according to claim 1 or 2, characterized in that, The ratio of the size of the imprint in the first direction to the size in the second direction is greater than or equal to 1.

4.

4. The microstructure layer according to claim 1 or 2, characterized in that, The imprint has an intaglio pattern, and the ratio of the area of the intaglio pattern to the area of the imprint is greater than or equal to 0.

35.

5. The microstructure layer according to claim 1 or 2, characterized in that, The morphology of the imprint includes at least one of a rectangle, a trapezoid, a triangle, and an ellipse.

6. The microstructure layer according to claim 1 or 2, characterized in that, The microstructure layer includes a plurality of the first refractive layers and a plurality of the second refractive layers; In the first direction, the plurality of first refractive layers and the plurality of second refractive layers are arranged at intervals.

7. The microstructure layer according to claim 1 or 2, characterized in that, The microstructure layer further includes a first substrate; In the first direction, the first substrate is disposed above the first refractive layer and the second refractive layer, and the material of the first substrate includes at least one of cellulose triacetate, polyethylene terephthalate, ultra-thin flexible glass, transparent polyimide, polymethyl methacrylate, or cycloolefin polymer.

8. A display device, characterized in that, The display device includes the microstructure layer described in any one of claims 1 to 7; The display device includes a substrate substrate, a driving circuit layer on one side of the substrate substrate, an electroluminescent layer on the side of the driving circuit layer away from the substrate substrate, and the microstructure layer on the side of the electroluminescent layer away from the substrate substrate.

9. The display device according to claim 8, characterized in that, The display device further includes a black matrix disposed below the microstructure layer.

10. The display device according to claim 9, characterized in that, The display device further includes a cover plate and a composite circular polarizer, and the cover plate is located above the composite circular polarizer; Wherein, The microstructure is located above the cover plate; or The microstructure layer is located between the cover plate and the composite circular polarizer; or The microstructure layer is located below the composite circular polarizer.

11. The display device according to claim 10, characterized in that, When the microstructure layer is located between the cover plate and the composite circular polarizer, the microstructure layer is located in a first region corresponding to the opening area of the black matrix, or in a second region corresponding to the non-opening area of the black matrix.

12. The display device according to claim 10, characterized in that, The composite circular polarizer includes a circular polarizer body and a brightness enhancement film, and the brightness enhancement film is disposed below the circular polarizer body; Wherein, the material of the brightness enhancement film includes cholesteric liquid crystal, and the central wavelength of the reflected light spectrum of the brightness enhancement film is 450nm - 480nm.

13. The display device according to claim 12, characterized in that, The full width at half maximum of the reflected light spectrum of the brightness enhancement film is 5nm - 80nm.

14. The display device according to claim 12, characterized in that, The thickness of the brightness enhancement film is less than or equal to 5um.

15. The display device according to any one of claims 12 to 14, characterized in that, The circular polarizer body includes a first substrate, a linear polarizer, a half-wave plate film layer, and a quarter-wave plate film layer, which are sequentially arranged from top to bottom; Among them, the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer is 15°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer is 75°; or the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the half-wave plate film layer is 105° or 285°, and the included angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter-wave plate film layer is 165° or 345°.

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