Microstructure layer and display device

Abstract

The embodiment of the utility model 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 technology, and in particular to a microstructure layer and a display device. Background Art

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

[0003] Among them, organic light-emitting diode (OLED) display devices have attracted more and more attention due to their advantages such as self-luminescence, fast response speed, wide visual range, high definition, high brightness, strong bending resistance, and low power consumption. They are also known as the next generation of dream display technology. However, OLED display devices generally have color deviation in visual angle. How to solve this problem is a major problem in the current development of OLED. Utility Model Content

[0004] 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 deviation of the OLED display device at an oblique viewing angle.

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

[0006] In the embodiment of the present application, the microstructure layer includes a first refractive layer and a second refractive layer with different refractive indices, and at the junction of the first refractive layer and the second refractive layer, an embossing and a filling member spaced apart in the second direction are formed; wherein the refractive index of the embossing is consistent with the refractive index of the first refractive layer or the second refractive layer, and the refractive index of the filling member is also consistent with the refractive index of the first refractive layer or the second refractive layer, but the refractive index of the embossing and the filling member are different. By providing a microstructure layer including a first refractive layer and a second refractive layer with different refractive indices, and having an embossing and a filling member spaced apart at the junction of the two, the dependence of the luminous spectrum on the change of viewing angle can be reduced, thereby improving the color shift phenomenon under a large viewing angle.

[0007] In a possible implementation, 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 embodiment of the present application, the refractive index of the first refractive layer is limited to 1.45-1.9, and the refractive index of the second refractive layer is limited to 1.3-1.6, which also limits the refractive index of the stamping and the filling member. Keeping the refractive index within this range can change the direction of the outgoing light path, redistribute the viewing angle light into a new spectrum, and the newly formed spectrum morphology is closer to the peak morphology of the normal viewing angle, thereby further improving the color shift phenomenon under a large viewing angle.

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

[0010] In the embodiment of the present application, the size of the embossing in the first direction is the height, and the size in the second direction is the width. The aspect ratio design of the embossing in the microstructure layer has a significant effect on the color improvement. The larger the aspect ratio, the higher the color improvement efficiency, and the better the color deviation performance at a wide viewing angle. By making the ratio of the size of the embossing in the first direction to the size of the embossing in the second direction greater than or equal to 1.4, the color deviation at an oblique viewing angle can be further improved.

[0011] In a possible implementation, the stamp has an intaglio pattern, and the ratio of the area of ​​the intaglio pattern to the area of ​​the stamp is greater than or equal to 0.35.

[0012] In the embodiment of the present application, the density of the pattern on the embossing has a significant effect on the color improvement rate. Generally speaking, the greater the density of the pattern on the embossing, the greater the proportion of the components involved in the refraction of the light path, the greater the degree of adjustment of the light path, and the better the improvement effect of the color difference. Therefore, by making the area of ​​the intaglio pattern on the embossing account for no less than 35%, the color deviation phenomenon under oblique viewing angles can be further improved.

[0013] In a possible implementation manner, the embossed shape 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 refraction layers and a plurality of the second refraction layers; in the first direction, the plurality of the first refraction layers and the plurality of the second refraction layers are arranged at intervals.

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

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

[0017] In the embodiment of the present application, by disposing a first substrate in the microstructure layer and above the first refractive layer and the second refractive layer, the microstructure layer can be supported.

[0018] The second aspect of the present application provides a display device, which comprises the microstructure layer described in any embodiment of the first aspect of the present application; the display device comprises a base substrate, a driving circuit layer located on one side of the base substrate, an electroluminescent layer located on a side of the driving circuit layer away from the base substrate, and the microstructure layer located on a side of the electroluminescent layer away from the base 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 embodiment of the present application, the microstructure layer is disposed above the black matrix, which can reduce the dependence of the light emitting spectrum on the viewing angle change, thereby improving the color cast phenomenon.

[0021] In a possible embodiment, the display device also 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 area corresponding to an opening area of ​​the black matrix, or in a second area corresponding to a non-opening area of ​​the black matrix.

[0023] In the embodiment of the present application, a microstructure layer is provided in the display device to improve color deviation under oblique viewing angles. There are multiple options for the position of the microstructure layer, so the position of the microstructure layer can be selected according to the actual production process.

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

[0025] In the embodiment of the present application, the central wavelength of the reflected light spectrum of the brightness enhancement film is 450nm-480nm, that is, the brightness enhancement film is a blue light brightness enhancement film. The principle of blue light transmittance enhancement is that when the display panel emits blue light and encounters a brightness enhancement film whose material is a cholesteric liquid crystal, the panel output light 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 normally emits the display module, and 50% of the left-handed light is reflected back to the panel, and after reflection by the panel, it becomes right-handed light, and then penetrates the brightness enhancement film and emits the display module. Therefore, by arranging a brightness enhancement film whose material is a cholesteric liquid crystal and whose reflection center wavelength is 450nm-480nm under the circular polarizer body, that is, the circular polarizer body and the brightness enhancement film are combined as a composite circular polarizer, and acted in the display device, the light emission efficiency of blue light can be improved, thereby improving the color deviation of the display device at an oblique viewing angle, and improving the brightness attenuation rate at an oblique viewing angle.

[0026] In a possible implementation, the half-peak width of the reflected light spectrum of the brightness enhancement film is 5 nm-80 nm.

[0027] In the embodiment of the present application, by making the half-peak width of the reflected light spectrum of the brightness enhancement film be 5nm-80nm, the light output brightness can be further increased, the reflectivity can be reduced, and the dark state can be reduced.

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

[0029] In the embodiment of the present application, if the thickness of the brightness enhancement film is too high, it is not conducive to spectral emission and bending of the display device. Therefore, the thickness of the brightness enhancement film is maintained at no more than 5 um.

[0030] In a possible embodiment, 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 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 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 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 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 embodiment of the present application, the 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 angle between the absorption axis direction of the linear polarizer and the slow axis direction of the quarter wave plate film layer is 75°. At this time, the brightness enhancing film is a left-handed cholesteric liquid crystal; the 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 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°. At this time, the brightness enhancing film is a right-handed cholesteric liquid crystal. Both the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal as brightness enhancing films can improve the light extraction efficiency of blue light, thereby improving the color cast of the display device at an oblique viewing angle, and improving the brightness decay rate at an 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 drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

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

[0034] Figure 2 A partial diagram of a microstructure layer according to an embodiment of the present application;

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

[0036] Figure 4 A partial diagram of a microstructure layer according to another embodiment of the present application;

[0037] Figure 5 A partial diagram of a microstructure layer according to yet another embodiment of the present application;

[0038] Figure 6A partial diagram of a microstructure layer according to another embodiment of the present application;

[0039] Figure 7 This is a schematic structural diagram of a microstructure layer according to yet another embodiment of the present application;

[0040] Figure 8 This is a schematic structural diagram of a microstructure layer according to another embodiment of the present application;

[0041] Fig. 9 This is a schematic structural diagram of a microstructure layer according to another embodiment of the present application;

[0042] Fig.10 A schematic structural diagram of a display device according to an embodiment of the present application;

[0043] Fig.11 is a schematic structural diagram of a display device according to another embodiment of the present application;

[0044] Fig.12 This is a schematic structural diagram of a display device according to another embodiment of the present application;

[0045] Fig.13 This is a schematic structural diagram of a display device according to another embodiment of the present application;

[0046] Fig.14 This is a schematic diagram of the function of a composite circular polarizer according to one embodiment of the present application;

[0047] Fig.15 This is a schematic structural diagram 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-embossing, 1042-filling piece, 1043-engraved 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 substrate;

[0050] X-first direction, Y-second direction, W-width, H-height. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The range defined in this way includes the endpoint values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if the range of 60-120 and 80-110 is listed for a specific parameter, it is understood that the range of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" represents that all real numbers between "0-5" have been fully listed herein, and "0-5" is just the abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0053] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0054] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0055] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also 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 the present application, "at least one", "one or more" refer to one, two or more. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0056] References to "one embodiment", "some embodiments", "an example" or "some examples" described in this specification mean that a particular feature, structure or characteristic described in conjunction with the example is included in one or more examples of the present application. Thus, the phrases "in one embodiment", "in some other examples", "in some other examples", etc. appearing at different places in this specification do not necessarily all refer to the same example, but mean "one or more but not all examples", unless otherwise specifically emphasized. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0057] OLED is a current-type organic light-emitting device. It is a phenomenon that emits light through the injection and recombination of carriers. The luminous intensity is proportional to the injected current. Under the action of the electric field, the holes generated by the anode and the electrons generated by the cathode will move, inject into the hole transport layer and the electron transport layer respectively, and migrate to the light-emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, which excite the light-emitting molecules and finally produce visible light. OLED display technology has the characteristics of high color gamut, high contrast, flexible self-luminescence, and low power consumption. It is one of the current mainstream information display technologies used in smart display ports. Its development direction is also to hope to have higher luminous efficiency and lower energy consumption. As the second-generation luminescent material, phosphorescent luminescent materials can use triplet excitons to emit light and improve luminous efficiency. They are increasingly used in OLED display technology, but phosphorescent luminescent materials, especially blue phosphorescent luminescent materials, have a large half-peak width, which will reduce the display color purity. In addition, in some OLED display devices, blue phosphorescent materials are used to emit blue light, while green and red light materials are made of fluorescent materials. When the user stands at a relatively oblique angle to view the display screen, color cast problems will occur due to the different attenuation degrees of the light generated by the blue phosphorescent material with a wider half-width and the light generated by the fluorescent material.

[0058] The common method to improve the color shift of the OLED display panel in the prior art 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 mask preparation process is very complicated and the accuracy is difficult to guarantee; 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 oblique viewing angles.

[0060] Figure 1Schematic diagram of the structure of the microstructure layer of one embodiment of the present application. Figure 1 As shown, the microstructure layer 100 includes a first refractive layer 102 and a second refractive layer 103 arranged along a first direction X, and the first refractive layer 102 and the second refractive layer 103 have different refractive indices.

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

[0062] like Figure 1 As shown, the microstructure layer 100 also includes a first substrate 101, which is a supporting substrate of the microstructure layer 100, and its material can be at least one of triacetyl cellulose (Tri-cellulose Acetate, TAC), polyethylene terephthalate (Polyethylene Glycol Terephthalate, PET), ultra-thin glass (Ultra-Thin Glass, UTG), transparent polyimide (Colorless Polyimide, CPI), polymethyl methacrylate (Polymethyl Methacrylate PMMA), and cycloolefin polymer (Cyclo Olefin Polymer, COP).

[0063] The material 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 adjusted by adding Zr element components; the material containing Zr element has a high refractive index and a wide bandgap, good transparency, and has the characteristics of low absorption and low scattering in the visible light and infrared bands.

[0064] The first refractive layer 102 and the second refractive layer 103 have different refractive indices, so they have a high refractive layer and a low refractive layer in a relative sense (a high refractive layer refers to a refractive layer with a high refractive index, and a low refractive layer refers to a refractive layer with a low refractive index). The first refractive layer 102 may be a high refractive layer and the second refractive layer 103 may be a low refractive layer; or the first refractive layer 102 may be a low refractive layer and the second refractive layer 103 may be a high refractive layer.

[0065] Please continue to refer to Figure 1 An embossing 1041 and a filling member 1042 are disposed at the junction of the first refractive layer 102 and the second refractive layer 103 . In the second direction Y, the embossing 1041 and the filling member 1042 are disposed at intervals. 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 embossing 1041 and the filling member 1042 are disposed on the first refractive layer 102 and the second refractive layer 103 , that is, the first refractive layer 102 and the second refractive layer 103 are used as substrates.

[0068] It should be understood that the spacing arrangement here is the spacing arrangement of a single stamping 1041 and a single filling piece 1042. That is, the specific arrangement in the second direction Y is: stamping 1041, filling piece 1042, stamping 1041, filling piece 1042, stamping 1041, filling piece 1042...; it can also be filling piece 1042, stamping 1041, filling piece 1042, stamping 1041, filling piece 1042, stamping 1041..., and this application does not specifically limit this.

[0069] It should be understood that the imprint 1041 is provided on the boundary between the first refractive layer 102 and the second refractive layer 103 , and nanoimprint technology or other imprint technology may be used, and this application does not limit this either.

[0070] The refractive index of the embossing 1041 is the same as that of the first refractive layer 102 or the second refractive layer 103 , the refractive index of the filler 1042 is the same as that of the first refractive layer 102 or the second refractive layer 103 , and the refractive indexes of the embossing 1041 and the filler 1042 are different.

[0071] That is, when the refractive index of the embossing 1041 is the same as that of the first refractive layer 102 , the refractive index of the filler 1042 is the same as that of the second refractive layer 103 ; when the refractive index of the embossing 1041 is the same as that of the second refractive layer 103 , the refractive index of the filler 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 a first direction X, and has an imprint 1041 and a filler 1042 arranged at intervals along a second direction Y and with different refractive indices, the high and low refractive index layers and the nanoimprint 1041 can change the direction of the outgoing light path, and redistribute the viewing angle light into a new spectrum, that is, after passing through the microstructure layer 100, the outgoing light can be closer to the normal viewing angle. In addition, after the light path adjustment of the microstructure layer 100, the light of each viewing angle is redistributed, including spectral components from a low viewing angle and spectral components from a high viewing angle, thereby making the spectral morphology closer to the peak shape of the normal viewing angle. Due to the influence of the microcavity effect, the light intensity at a low viewing angle will be significantly stronger than that at a large viewing angle, and the newly allocated spectrum will be closer to the peak shape of the low viewing angle. Since the spectrum corresponds to the color coordinates one by one, the colors can be compared quantitatively, and the changes in the peak position and peak width will cause the color coordinates to shift. Therefore, the spectrum adjusted by the microstructure layer 100 will have an morphology that is closer to the peak morphology at the positive viewing angle, that is, the changes in the peak position and half-peak width have hysteresis, which can slow down the viewing angle-dependent color shift caused by the microcavity effect.

[0073] In the above scheme, by providing a microstructure layer 100 including a first refractive layer 102 and a second refractive layer 103 with different refractive indices, and having an embossing 1041 and a filler 1042 arranged at intervals at the junction of the two, the dependence of the luminous spectrum on the viewing angle change can be reduced, thereby improving the color shift phenomenon under a large viewing angle.

[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 scheme, the refractive index of the first refractive layer is limited to 1.45-1.9, and the refractive index of the second refractive layer is limited to 1.3-1.6, which also limits the refractive index of the stamping and the filling member. Keeping the refractive index within this range can change the direction of the outgoing light path, redistribute the viewing angle light into a new spectrum, and the newly formed spectrum morphology is closer to the peak morphology of the normal viewing angle, thereby further improving the color shift phenomenon under a large viewing angle.

[0076] Specifically, the refractive index of the first refractive layer 102 may 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 may 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 have values ​​within the above respective ranges on the basis of satisfying different refractive indices.

[0079] Figure 2 FIG. 1 is a partial diagram of a microstructure layer according to an embodiment of the present application. Figure 2 As 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 mentioned above, the first direction X is the vertical direction of the microstructure layer 100, which can also be called the height direction of the microstructure layer 100. Figure 2 The second direction Y is the horizontal direction of the microstructure layer 100, which can also be called the width direction of the microstructure layer 100, that is, Figure 2 The direction of W in .

[0081] In the above solution, the aspect ratio design of the embossing 1041 in the microstructure layer 100 has a significant effect on color improvement. The larger the aspect ratio, the higher the color improvement efficiency and the better the color shift performance at a wide viewing angle. By making the ratio of the size of the embossing 1041 in the first direction X to that 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 ratio of the imprint 1041 in the first direction X to the second direction Y can be 1.4, 1.5, 1.8, 2.1, 2.5 or any value in the above range.

[0083] Figure 3 FIG. 1 is a schematic diagram of the structure of a microstructure layer according to another embodiment of the present application. Figure 3 As shown, in some embodiments, the stamp 1041 has an intaglio pattern 1043 , and the ratio of the area of ​​the intaglio pattern 1043 to the area of ​​the stamp 1041 is greater than or equal to 0.35.

[0084] In the embodiment of the present application, the pattern density on the imprint 1041 has a significant effect on the color improvement rate. Generally speaking, the greater the pattern density on the imprint 1041, the greater the proportion of the components participating in the refraction of the light path, the greater the degree of adjustment of the light path, and the better the improvement effect of the color difference. Therefore, by making the area of ​​the intaglio pattern 1043 on the imprint 1041 account for no less than 35%, the color deviation phenomenon under oblique viewing angles can be further improved.

[0085] The present application has no particular limitation on the specific pattern of the intaglio pattern 1043 . For example, the intaglio pattern 1043 may be rectangular, trapezoidal, or the like.

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

[0087] Figure 4-6Detailed description of the microstructure layer of some embodiments of the present application. Figure 4-6 As shown, the embossing 1041 on the microstructure layer 100 may have various morphologies, which may be Figure 1 The rectangle in Figure 4 The oval in Figure 5 The inverted trapezoid in Figure 6 The triangle in .

[0088] It should be understood that the stamping 1041 and the filler 1042 may have the same morphology, for example Figure 5 As shown, the embossing 1041 and the filling piece 1042 are both trapezoidal in shape; the embossing 1041 and the filling piece 1042 may also have different shapes, for example, Figure 6 As shown, the shape of the stamp 1041 is a trapezoid, and the shape of the filling piece 1042 is a triangle.

[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 FIG. 1 is a schematic diagram of the structure of a microstructure layer according to another embodiment of the present application. Figure 1 and Figure 7 As 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 Fig. 9 Schematic diagram of the structure of the microstructure layer of some embodiments of the present application. Figure 8 and Fig. 9 As shown, the microstructure layer 100 includes a plurality of first refractive layers 102 and a plurality of second refractive layers 103 ; in a 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 configuration of the microstructure layer 100 can be as follows: Figure 8 As shown, that is, in the first direction X, the microstructure layer 100 includes from top to bottom: a second refractive layer 103, a first refractive layer 102, and a second refractive layer 103; the specific arrangement of the microstructure layer 100 from top to bottom may also be: a second refractive layer 103, a second refractive layer 103, and a first refractive layer 102; the specific arrangement of the microstructure layer 100 from top to bottom may also be: a first refractive layer 102, a second refractive layer 103, and a second refractive layer 103.

[0093] When the microstructure layer 100 includes two first refractive layers 102 and two second refractive layers 103, the specific configuration of the microstructure layer 100 can be as follows: Fig. 9 As shown, that is, in the first direction X, the microstructure layer 100 includes from top to bottom: a first refractive layer 102, a second refractive layer 103, a first refractive layer 102, and a second refractive layer 103; the specific arrangement of the microstructure layer 100 from top to bottom may also be: a first refractive layer 102, a first refractive layer 102, a second refractive layer 103, and a second refractive layer 103. The specific arrangement of the microstructure layer 100 from top to bottom may also be: a second refractive layer 103, a second refractive layer 103, a first refractive layer 102, and a first refractive layer 102.

[0094] That is to say, the present application does not specifically limit the specific number of the first refractive layer 102 and the second refractive layer 103 contained in the microstructure layer 100. Figure 8 and Fig. 9 As shown, the first refractive layer 102 or the second refractive layer 103 located in the middle may be provided with embossing 1041 at both sides of the junction, or may be provided with embossing 1041 at only one side of the junction, which is also not limited in the present application.

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

[0096] Fig.10 Schematic diagram of the structure of a display device of the present application. Fig.10 As shown, the display device 300 includes a microstructure layer 100, which is the microstructure layer described in any of the above embodiments; the display device 300 includes a base substrate 309, a driving circuit layer 308 located on one side of the base substrate 309, an electroluminescent layer 307 located on a side of the driving circuit layer 308 away from the base substrate 309, and a microstructure layer 100 located on a side of the electroluminescent layer 307 away from the base substrate 309.

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

[0098] It should be understood that the different film layers in the present application are connected by an adhesive layer, and the adhesive layer can be a shadowless adhesive (UV adhesive), a pressure-sensitive adhesive, a heat-curing water-based adhesive, or other adhesives commonly used in the OLED assembly process, and the present 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 the present application, nor does it affect the scope of the present application.

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

[0100] In the above solution, the microstructure layer 100 is disposed above the black matrix 304, which can reduce the dependence of the light emitting 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, wherein 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 to protect the composite circular polarizer 401. The material of the cover plate 301 can be at least one of CPI, PET or UTG. The cover plate 301 can be multi-layered, that is, it can be two or more layers. When the cover plate 301 is two or more layers, the multi-layer cover plate 301 can be made of the same material or a combination of different materials.

[0103] like Fig.10 As 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 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, an encapsulation layer 306, an electroluminescent layer 307, a driving circuit layer 308, and a base substrate 309.

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

[0105] Fig.11 FIG. 1 is a schematic diagram of the structure of another display device of the present application. Fig.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 top of the display device 300, the microstructure layer 100 can be used as a protective film for the display screen. At this time, in order to ensure the repair effect, the microstructure layer 100 needs to be used with a repairable adhesive material, that is, a repairable adhesive layer 110 is set between the microstructure layer 100 and the cover plate 301. Therefore, the display device 300 is sequentially arranged from top to bottom: microstructure layer 100, repairable adhesive layer 110, cover plate 301, composite circular polarizer 401, black matrix 304, touch layer 305, sealing layer 306, electroluminescent layer 307, drive circuit layer 308, and base substrate 309.

[0106] Fig.12 FIG. 1 is a schematic diagram of the structure of a display device according to another embodiment of the present application. Fig.12 As shown, the microstructure layer 100 is located between the cover plate 301 and the composite circular polarizer 401. The display device 300 includes, from top to bottom: a cover plate 301, a microstructure layer 100, a composite circular polarizer 401, a black matrix 304, a touch layer 305, a sealing layer 306, an electroluminescent layer 307, a driving circuit layer 308, and a base substrate 309.

[0107] Fig.13 FIG. 1 is a schematic diagram of the structure of a display device according to another embodiment of the present application. Fig.12 and 13 As 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 area corresponding to an opening area 3041 of the black matrix 304 , or in a second area 3042 corresponding to a non-opening area of ​​the black matrix 304 .

[0108] In the above solution, the color shift under oblique viewing angle can be improved by providing the microstructure layer 100 in the display device 300. There are multiple options for the position of the microstructure layer 100, so 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 enhancing film, wherein the brightness enhancing film is disposed below the circular polarizer body; wherein the material of the brightness enhancing film includes cholesteric liquid crystal, and the central wavelength of the reflected light spectrum of the brightness enhancing film is 450nm-480nm.

[0110] Fig.14 Schematic diagram of the function of a composite circular polarizer according to an embodiment of the present application. Fig.14The central wavelength of the reflected light spectrum of the brightness enhancement film shown is 450nm-480nm, 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 transmittance enhancement is that the panel emits blue light and encounters a brightness enhancement film made of cholesteric liquid crystal, which can decompose the panel emitted light into about 50% right-handed light and about 50% left-handed light. 50% of the right-handed light penetrates the brightness enhancement film and normally emits 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 emits the display module. Under the same current drive, the blue light brightness enhancement efficiency can be maintained at 20%-40%, thereby improving the color deviation of the display device 300 at an oblique viewing angle and the brightness attenuation rate at an oblique viewing angle.

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

[0112] In some embodiments, the half-peak width of the reflected light spectrum of the brightness enhancement film is 5 nm to 80 nm.

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

[0114] Specifically, the half-peak width 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 brightness enhancement film has a thickness less than or equal to 5 um.

[0116] In the embodiment of the present application, if the thickness of the brightness enhancement film is too high, it is not conducive to spectral emission and bending of the display device. Therefore, the thickness of the brightness enhancement film is maintained to be less than or equal to 5 um.

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

[0118] Fig.15 FIG. 1 is a schematic diagram of the structure of a display device according to another embodiment. Fig.15As shown, in a possible embodiment, 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 which are arranged in sequence from top to bottom; wherein, the 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 angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the quarter wave plate film layer 4016 is 75°; or the 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 angle between the absorption axis direction 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 polarization functional film, which has the function of converting natural light into linear polarized light. The film layer of the linear polarizer 4014 has an absorption axis. The absorption axis generally refers to a 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, and the light wave generates a phase difference of half the wavelength when passing through the half-wave plate film layer 4015; the quarter-wave plate film layer 4016 includes a fast axis and a slow axis in a plane parallel to the panel, and the light wave generates a phase difference of quarter the wavelength when passing through the quarter-wave plate film layer 4016. 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, and the fast axis and the slow axis are perpendicular to each other.

[0121] In the above scheme, the 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 angle between the absorption axis direction of the linear polarizer 4014 and the slow axis direction of the quarter-wave plate film layer 4016 is 75°. At this time, the brightness enhancement film 4012 is a left-handed cholesteric liquid crystal. The 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°, the 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°, at this time, the brightness enhancement film 4012 is a right-handed cholesteric liquid crystal, and the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal are used as the brightness enhancement film 4012, which can improve the light extraction efficiency of the blue light, thereby improving the color deviation of the display device 300 at an oblique viewing angle, and also improving the brightness attenuation rate at an oblique viewing angle.

[0122] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A microstructure layer, characterized in that: include: A first refractive layer and a second refractive layer arranged along a first direction, wherein the first refractive layer and the second refractive layer have different refractive indices; A stamping and a filling piece are arranged at the junction of the first refractive layer and the second refractive layer, and the stamping and the filling piece are arranged at intervals in a second direction, and the second direction is perpendicular to the first direction; The refractive index of the embossing is the same as that of the first refractive layer or the second refractive layer, the refractive index of the filler is the same as that of the first refractive layer or the second refractive layer, and the refractive index of the embossing is different from that of the filler.

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: A ratio of a size of the embossing in the first direction to a size of the embossing 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 stamp has an intaglio pattern, and the ratio of the area of ​​the intaglio pattern to the area of ​​the stamp is greater than or equal to 0.

35.

5. The microstructure layer according to claim 1 or 2, characterized in that: The embossed shape 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, a plurality of the first refraction layers and a plurality of the second refraction layers are arranged at intervals.

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

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

9. The display device according to claim 8, characterized in that: The display device further includes a black matrix, and the black matrix is ​​arranged below the microstructure layer.

10. The display device according to claim 9, characterized in that: The display device further comprises a cover plate and a composite circular polarizer, wherein the cover plate is located above the composite circular polarizer; in, 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 area corresponding to an opening area of ​​the black matrix, or in a second area corresponding to a non-opening area of ​​the black matrix.

12. The display device according to claim 10, characterized in that: The composite circular polarizer comprises a circular polarizer body and a brightness enhancement film, wherein the brightness enhancement film is arranged below the circular polarizer body; 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 half-peak width 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 5 um.

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

Images