Viewing angle expanding film and display device

Abstract

The invention discloses a visual angle expanding film and a display device, and relates to the technical field of optical films. The visual angle expanding film structure comprises a base material layer, a transparent film layer and a transparent film layer, the multiple polyhedral structures are arranged on the base material layer in a spaced array mode in the preset direction; the plurality of prism structures are sequentially arranged between the adjacent polyhedral structures in an equally divided array manner; wherein the number of the prism structures between the adjacent polyhedral structures is 1-5, and an array is alternately extended to form a composite microstructure, so that the composite microstructure has wide viewing angle and high-brightness optical performance. According to the invention, the problem of poor use effect caused by excessive reduction of the brightness of the central view angle due to the limitation of a single microstructure in the current wide view angle processing method is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical film technology, in particular to a viewing angle expansion film and a display device. BACKGROUND

[0002] With the iterative development of modern lighting technology, some products such as teaching display screens require to expand the optical viewing angle while ensuring a certain brightness, so that the audience can clearly see the display screen at different angles, which requires the use of microstructures.

[0003] In view of the current wide viewing angle problem, the industry generally adopts the method of setting a ladder-shaped microstructure. The flat top structure changes the slope of the two sides to disperse light outward, thereby achieving the effect of expanding the viewing angle. However, this processing method is limited by a single microstructure, which reduces the central viewing angle brightness too much, resulting in poor use effect. In view of the above problems, no effective solution has been proposed. SUMMARY

[0004] The purpose of the present application is to provide a viewing angle expansion film and a display device to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A viewing angle expansion film, comprising: a substrate layer; a plurality of polygonal structures arranged in an array along a predetermined direction on the substrate layer; and a plurality of prism structures arranged in an array between adjacent polygonal structures; wherein the number of prism structures between adjacent polygonal structures is 1-5, forming a composite microstructure in an alternating array, so that the composite microstructure has wide viewing angle and high brightness optical effect.

[0006] As a preferred embodiment, the prism structure is an isosceles right structure, and the prism width W1 is 15-20 μm.

[0007] As a preferred embodiment, the polygonal structure comprises: a ladder-shaped bottom layer; two first inclined sides arranged opposite to the two sides of the ladder-shaped bottom layer; a ladder-shaped middle layer, the bottom edge of which coincides with the top edge of the ladder-shaped bottom layer; and two second inclined sides arranged opposite to the two sides of the ladder-shaped middle layer and connected to the two first inclined sides, respectively; a top layer, the bottom edge of which coincides with the top edge of the ladder-shaped middle layer; and two third inclined sides arranged opposite to the two sides of the top layer to form a top corner, and connected to the two second inclined sides, respectively.The trapezoidal bottom layer and the trapezoidal middle layer are both right isosceles trapezoids in the same direction, and the included angle between the first inclined side and the horizontal line is greater than the included angle between the second inclined side and the horizontal line; and the top layer is an isosceles triangle with a top angle greater than or equal to 170°.

[0008] Preferably, the trapezoidal bottom layer, the trapezoidal middle layer and the top layer are combined by using the same material and different slopes to form an optical modulation unit without an actual layering interface.

[0009] Preferably, the trapezoidal bottom layer is formed by two first inclined sides to form a first inclined surface area, the trapezoidal middle layer is formed by two second inclined sides to form a second inclined surface area, and the top layer is formed by a top area. The slope of the first inclined surface area, the slope of the second inclined surface area and the slope of the top area are all different.

[0010] Preferably, the projection width of the first inclined surface area at the bottom is 1-5 μm. The projection width of the second inclined surface area at the bottom is 1-5 μm. The projection width of the top area formed by the top layer at the bottom is 1-5 μm.

[0011] Preferably, the first included angle between the first inclined side and the horizontal line is in the range of 60°-80°, and the second included angle between the second inclined side and the horizontal line is in the range of 50°-70°.

[0012] Preferably, the top angle of the top layer is greater than or equal to 170° and less than 180°.

[0013] Preferably, the top of the first inclined side is connected to the bottom of the second inclined side, and the top of the second inclined side is connected to the bottom of the third inclined side to form a polygonal microstructure. The absolute values of the slopes of the first inclined side, the second inclined side and the third inclined side decrease in order from bottom to top.

[0014] To achieve the above-mentioned purpose, according to another aspect of the present application, a display device is also provided.

[0015] According to the display device of the present application, the view angle expanding film is included.

[0016] Beneficial effects: in the embodiments of the present application, the multi-faceted structure and the prism structure are combined, the number of the prism structure between adjacent multi-faceted structures is 1-5, and the composite microstructure is formed by alternating extension array, so that the composite microstructure has wide viewing angle and high brightness, and the purpose of expanding optical viewing angle under high brightness is achieved, thereby realizing the technical effects of easy processing and forming and obtaining wider optical viewing angle, and further solving the technical problems that the current wide viewing angle processing method is limited by a single microstructure, the brightness of the central viewing angle is reduced too much, and the use effect is poor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a viewing angle expansion film of the present application; Figure 2 is a multi-faceted structure schematic diagram of a viewing angle expansion film of the present application; Figure 3 is a multi-faceted structure schematic diagram of another viewing angle expansion film of the present application; and Figure 4 is a light path diagram of a multi-faceted structure of a viewing angle expansion film of the present application.

[0018] The reference signs are: 10, trapezoidal bottom layer; 101, first inclined side; 20, trapezoidal middle layer; 201, second inclined side; 30, top layer; 301, third inclined side; A, first inclined surface area; B, second inclined surface area; C, top area; 40, substrate layer; 50, multi-faceted structure; 60, prism structure. DETAILED DESCRIPTION

[0019] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0020] It should be noted that the terms "first", "second" and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of these terms herein is merely for distinguishing between the similar objects and the same can be referenced by other terms without departing from the scope of the application. The terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "about" and "substantially" are used to describe and account for small fluctuations, such as due to measurement or manufacturing tolerances.

[0021] In addition, the terms "mount", "set", "provided with", "connected", "linked", "sleeved" should be interpreted broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood according to the specific circumstances by those skilled in the art.

[0022] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] As shown in Figures 1-4 The present application relates to a viewing angle expansion film and a display device. As shown in Figures 1-3 The viewing angle expansion film comprises a substrate layer 40; the substrate layer 40 serves as the physical carrier and basis of the entire optical film. Preferably, the substrate layer 40 is usually made of transparent polymer material, such as PET, PC, PMMA, etc.

[0024] A plurality of multi-faceted structures 50 are arranged on the substrate layer 40 in a preset direction; the multi-faceted structures 50 can achieve the effects of light guiding and viewing angle control; Specifically, the inclined surface can disperse the incident light to a wider angular range.

[0025] Through the angle and structure height of the preset inclined surface, the light can be effectively guided to an angle deviating from the normal (vertical direction), thereby increasing the viewing angle, so that the screen brightness is higher and the color is more accurate when the user views from the side. The preset direction is the horizontal direction, or the X-axis direction in the two-coordinate system.

[0026] A plurality of prism structures 60 are arranged between adjacent multi-faceted structures 50 in an equal division array; the prism structure 60 refers to a convex structure with a triangular cross section (such as an isosceles right triangle), which is filled in the gap between two adjacent multi-faceted structures 50 in an equal division manner; and there are 1-5 prism structures 60 between two adjacent multi-faceted structures 50. The effect of light convergence and brightness improvement can be achieved.

[0027] Specifically, by using the total internal reflection and refraction principle of the prism, the light that would have been scattered at a large angle is redirected in the direction close to the normal (perpendicular to the screen), improving the axial brightness in front of the screen, making the picture look brighter and sharper.

[0028] Among them, the number of prism structures 60 between adjacent multi-faceted structures 50 is 1-5, forming a composite microstructure in an alternating extension array, so that the composite microstructure has the optical effects of wide viewing angle and high brightness.

[0029] Specifically, the multi-faceted structures 50 (which play a role in expanding the viewing angle) and the prism structures 60 (which play a role in converging and brightening) are alternately and regularly arranged in space (alternating extension array); the multi-faceted structures 50 are arranged as a "main frame", and the prism structures 60 are embedded as "fillers" in the gaps therebetween. Form a kind of composite, non-single type of surface microstructure. It is neither a pure prism film nor a pure expansion viewing angle film, but a functional integration of the two.

[0030] Unlike the traditional trapezoidal expansion viewing angle structure, the new multi-faceted expansion viewing angle structure 50 has a large angle obtuse vertex, which can also guide light to a larger angle range, further enhancing the expansion viewing angle effect.

[0031] At the same time, by changing the number of prisms, the on-axis brightness and spatial viewing angle brightness uniformity can be adjusted, which has good flexibility.

[0032] The present application adopts a multi-faceted optical structure with two slopes and an obtuse vertex, and inserts prism structures, so that it has the large viewing angle effect of the multi-faceted structure and the light collecting effect of the prism structure, thereby improving the optical brightness while maintaining a large viewing angle.

[0033] From the above description, it can be seen that the present application achieves the following technical effects: In the embodiments of the present application, the multi-faceted structure and the prism structure are combined, the number of the prism structures between adjacent multi-faceted structures is 1-5, and the composite microstructure is formed by alternately extending the array, so that the composite microstructure has a wide viewing angle and high brightness, the purpose of expanding the optical viewing angle under high brightness is achieved, thereby realizing the technical effects of easy processing and forming and obtaining a wider optical viewing angle, and further solving the technical problem that the current wide viewing angle processing method is limited by a single microstructure, so that the brightness of the central viewing angle is reduced too much, thereby causing poor use effect.

[0034] Further, the prism structure 60 is an isosceles right structure, and the prism width W1 is 15-20 μm. It can be understood that the isosceles right structure ensures that the optical behavior of the light on the left and right sides of the prism structure 60 is symmetrical, which is crucial for uniformly controlling the light distribution in the horizontal and vertical directions (or the preset direction and the vertical direction thereof), helps to realize the brightness improvement and more uniform viewing angle expansion in the normal viewing angle, and finally ensures the symmetry and accuracy of light control.

[0035] The prism width W1 is 15-20 μm wide: ensures that the structure is in the efficient optical control scale, allows 1-5 prisms to be arranged in a limited space to realize design flexibility, effectively suppresses optical defects such as Moire fringes, and ensures excellent mass production feasibility and structural stability.

[0036] In summary, the combination of the above two specific parameters enables the prism structure 60 to maximize its brightness enhancement performance while minimizing the negative impact on the widening ability of the multi-faceted structure 50, and ensures the uniformity and producibility of the overall composite structure: while significantly improving the front brightness of the screen, maintaining a wide and uniform viewing angle.

[0037] As shown in FIG. 1, the multi-faceted structure includes a trapezoidal bottom layer 10, a trapezoidal middle layer 20, and a trapezoidal top layer 30. Figures 2-3 The trapezoidal bottom layer 10 can achieve good light guiding effect and also can achieve good cooperation effect with other components, thereby achieving multiple functions.

[0038] Two first inclined sides 101 are oppositely arranged on the two sides of the trapezoidal bottom layer 10; by arranging the first inclined side 101 in the horizontal direction of the trapezoidal bottom layer 10 and on the left and right sides thereof, the two first inclined sides 101 are inclined to the center line direction of the trapezoidal bottom layer 10, which can achieve the effect of adjusting the light.

[0039] The trapezoidal middle layer 20 has a bottom edge coinciding with the top edge of the trapezoidal bottom layer 10; which can achieve good cooperation effect with the trapezoidal bottom layer 10, thereby achieving the effect of adjusting the incident light.

[0040] Two second inclined edges 201 are oppositely arranged on two sides of the trapezoidal middle layer 20 and are connected with the two first inclined edges 101 respectively; the second inclined edges 201 are arranged on the left and right sides of the trapezoidal middle layer 20 in the horizontal direction, and are inclined to the center line direction of the trapezoidal middle layer 20, so that the effect of adjusting light can be achieved.

[0041] The top layer 30 has a bottom edge coinciding with the top edge of the trapezoidal middle layer 20; the top layer 30 can be well matched with the trapezoidal middle layer 20, so that the effect of adjusting incident light can be achieved.

[0042] Two third inclined edges 301 are oppositely arranged on two sides of the top layer 30 to form a top angle, and are connected with the two second inclined edges 201 respectively.

[0043] It should be noted that the optical microstructure layer is usually composed of a material with a high refractive index, which causes refraction or reflection of light when passing through, thereby achieving the desired optical effect. The refractive index is usually >1.5.

[0044] In optical devices and systems, the optical microstructure layer is usually used to modulate, separate or control light. For example, in a liquid crystal display, a prism structure layer can be used to adjust the propagation direction of light, thereby achieving a display effect of high brightness at a normal viewing angle.

[0045] The cross sections of the trapezoidal bottom layer 10 and the trapezoidal middle layer 20 are both positive isosceles trapezoids in the same direction, the included angle between the first inclined edge 101 and the horizontal line is greater than the included angle between the second inclined edge 201 and the horizontal line, and the top layer (30) is an isosceles triangle with a top angle greater than or equal to 170°.

[0046] So that the incident light is expanded through the multi-faceted structure to expand the viewing angle and improve the brightness. By arranging the cross sections of the trapezoidal bottom layer 10 and the trapezoidal middle layer 20 as positive isosceles trapezoidal structures in the same direction, and arranging the top layer 30 as a large-angle obtuse top end with a top angle greater than or equal to 170°, a good matching effect can be achieved, and good light guiding and adjusting effects can be ensured, so that the incident light is expanded through the multi-faceted structure to expand the viewing angle and improve the brightness.

[0047] The same direction can be a vertical direction; the positive isosceles trapezoidal structure is an isosceles trapezoidal structure with the bottom edge below the top edge, and the length of the bottom edge is greater than the length of the top edge.

[0048] The purpose of the present application is to distinguish from the conventional view angle expansion structure, and to improve the brightness of the display while maintaining a large viewing angle.

[0049] The present invention provides an optical microstructure that improves brightness by more than 10% compared to conventional solutions while maintaining the same optical viewing angle in different directions. The optically functional layer structure is constructed from three layers of inclined surfaces with different slopes, combined with a prism structure. This composite structure improves the brightness of the display at normal viewing angles while maintaining a wide optical viewing angle.

[0050] like Figure 4 The figure shows the optical path decomposition diagram of the multi-faceted structure. When light is incident on different inclined surfaces at the same angle, it will be emitted at different angles. The small-angle inclined surface refracts the light to a larger angle range, which can expand the viewing angle, while the large-angle inclined surface can gather the light to the small viewing angle range in the middle, thereby improving the brightness in the direction of the normal viewing angle.

[0051] Beneficial effects of this application: The multifaceted optical structure consists of two obtuse-angled surfaces with different slopes, and a compound microstructure unit composed of a prism structure. This has the dual effects of expanding the light distribution viewing angle through reflection and refraction at the oblique surfaces with different slopes, and improving the light collection efficiency at the normal viewing angle through right-angle prisms. This can improve the brightness of the display at the normal viewing angle while maintaining a wide viewing angle range.

[0052] Furthermore, the trapezoidal bottom layer 10, the trapezoidal middle layer 20, and the top layer 30 are constructed from the same material and have inclined surfaces of varying slopes, forming an optical modulation unit without a substantial stacking interface. It is understood that the different inclined surfaces of the trapezoidal bottom layer 10 and the trapezoidal middle layer 20, combined with the top layer 30's large obtuse-angled top structure, form an optical modulation layer. By configuring the inclined surfaces of the trapezoidal bottom layer 10 and the trapezoidal middle layer 20, and the large obtuse-angled top layer 30, their varying inclination angles achieve the effect of regulating light propagation, thereby optimizing the display's optical performance, such as viewing angle and brightness.

[0053] Specifically, the combination of inclined surfaces with different slopes: Slope refers to the degree of inclination of an inclined surface relative to the horizontal. In this structure, the inclined surfaces of the trapezoidal bottom layer 10, the trapezoidal middle layer 20, and the top layer 30 each have different slopes, meaning that the three inclined surfaces each have different angles. These different angles create different refraction or reflection effects when light passes through each inclined surface.

[0054] Formation of the optical modulation layer: The structure formed by the combination of the inclined surfaces of the trapezoidal bottom layer 10, the trapezoidal middle layer 20, and the top layer 30 is called the "optical modulation layer". The function of the modulation layer is to modulate, adjust, and guide the path of light as it passes through. Due to the combination of inclined surfaces with different slopes, light will produce different deflections and scattering when passing through the entire structure.

[0055] The purpose of the modulation is to achieve a wider viewing angle, brightness enhancement and reduce light loss. When the light passes through this modulation layer, it can not only be guided to a wider direction, but also to a certain extent reduce the light loss caused by reflection and refraction, thereby maintaining high brightness and uniformity.

[0056] Through the combination of different slope surfaces, the light will experience multiple refractions and reflections when passing through, and finally be guided to the preset direction angle.

[0057] Further, the trapezoidal bottom layer 10 is formed by two first inclined edges 101 to form a first inclined surface area A, the trapezoidal middle layer 20 is formed by two second inclined edges 201 to form a second inclined surface area B, and the top layer 30 forms a top area C; wherein the slope of the first inclined surface area A, the slope of the second inclined surface area B and the slope of the top area C are all different; and the top area C is designed as a large obtuse angle. It can be understood that the trapezoidal bottom layer 10 is composed of two first inclined edges 101, and the two inclined edges are arranged opposite to each other and form two inclined surfaces, which are called first inclined surface areas A; the first inclined surface area A refers to the inclined surface area composed of two first inclined edges 101, and the inclined surface is the main area for refraction when the light enters.

[0058] Similarly to the trapezoidal bottom layer 10, the trapezoidal middle layer 20 is composed of two opposite second inclined edges 201, and the two inclined edges also form two inclined surfaces, which are called second inclined surface areas B; the second inclined surface area B is also the area where the light is modulated when passing through the microstructure, and is mainly responsible for adjusting the direction and intensity of the light.

[0059] The top layer 30 is composed of two opposite inclined edges 301 to form a top area C; the top area C is also the area where the light is modulated when passing through the microstructure, and is mainly responsible for adjusting the direction and intensity of the light.

[0060] The slope of the first inclined surface area A is different from the slope of the second inclined surface area B, and the slope refers to the inclination angle of the inclined surface; the slope of the inclined surface area (first inclined edge 101) of the trapezoidal bottom layer 10 is different from the slope of the inclined surface area (second inclined edge 201) of the trapezoidal middle layer 20 and the slope of the top area C.

[0061] The use of different slopes allows the degree of refraction of the light when passing through the first inclined surface area A to be different from the degree of refraction when passing through the second inclined surface area B, and the degree of refraction of the light when passing through the top area C to be different from the degree of refraction when passing through the first inclined surface area A and the second inclined surface area B. This design allows more precise control and modulation of the light to optimize the optical performance, such as widening the viewing angle, improving brightness or reducing reflection.

[0062] Different slopes for different purposes: the slope of the first inclined surface area A is larger, the slope of the second inclined surface area B is smaller, and the top area C has a large obtuse angle greater than or equal to 170°. It can allow light to refract with different intensities in different areas, and also achieve more accurate light control, so that light propagates according to the designed path, optimizes the distribution of light, and improves key performance such as viewing angle and brightness.

[0063] Further, the projection width of the first inclined surface area A at the bottom is 1-5μm. It can be understood that the small size of the inclined surface area allows very fine control of light, which can effectively adjust the propagation direction and intensity of light.

[0064] Improve optical performance: enhance brightness and uniformity: small size of the inclined surface helps to reduce optical loss, so that more light can effectively pass through, improve the brightness and brightness uniformity of the display screen.

[0065] Further, the projection width of the second inclined surface area B at the bottom is 1-5μm. It can be understood that by using the above settings, the same functions as the first inclined surface area A can be achieved; here is not described.

[0066] Further, the projection width of the top area C at the bottom formed by the top layer 30 is 1-5μm. It can be understood that by setting the width of the top area C in the above interval range, it can ensure that the light remains uniformly distributed after entering the prism structure; the width range can be optimized according to the optical design requirements to optimize the output effect of light, such as: expanding the viewing angle, reducing reflection distortion or improving brightness uniformity.

[0067] Further, the first included angle between the first inclined edge 101 and the horizontal line is in the range of 60°-80°, and the second included angle between the second inclined edge 201 and the horizontal line is in the range of 50°-70°. It can be understood that the first inclined edge 101 refers to the inclined edge of the trapezoidal bottom layer 10, and the first included angle with the horizontal line is between 60° and 80°; the design of the larger included angle (60°-80°) makes the light produce a larger refraction angle when entering the prism structure, which helps to significantly change the propagation direction of the light.

[0068] The second inclined edge 201 refers to the inclined edge of the trapezoidal middle layer 20, and the second included angle with the horizontal line is between 50° and 70°; the design of the smaller included angle (50°-70°) is slightly smaller than the angle of the first inclined edge 101, allowing the light to propagate at a slightly gentle refraction or reflection angle when passing through the trapezoidal middle layer 20, which helps to further adjust and distribute the light on the light refraction path.

[0069] Further, the top region C and the inclined surface regions A and B can have the same or different sizes. It can be understood that the flexible use effect can be achieved, thereby meeting the needs of various use scenarios.

[0070] Further, the trapezoidal bottom layer 10, the trapezoidal middle layer 20 and the top layer 30 are sequentially stacked from large to small upwards, the outer surface of the trapezoidal bottom layer 10 and the outer surface of the trapezoidal middle layer 20 and the top layer 30 form a continuous composite microstructure with a plurality of inclined surfaces, and the plurality of inclined surfaces are symmetrically arranged about the vertical central axis. It can be understood that good microstructure forming effect can be achieved, thereby achieving good optical performance.

[0071] Further, the top angle of the top layer 30 is greater than or equal to 170° and less than 180°. It can be understood that good optical performance can be ensured, and meanwhile, multiple angle options are provided, thereby meeting the needs of various use scenarios and improving the flexibility of use.

[0072] Further, the top of the first inclined side is connected to the bottom of the second inclined side, and the top of the second inclined side is connected to the bottom of the third inclined side to form a composite microstructure. The absolute values of the slopes of the first inclined side, the second inclined side and the third inclined side sequentially decrease from bottom to top. It can be understood that the required optical shape can be obtained, thereby ensuring good optical performance.

[0073] The following embodiments are used for further illustration: The different embodiments and the comparative example are attached to a commercially available 85-inch flat television screen, the extension direction of the viewing angle film microstructure is parallel to the short side direction of the television, and the 1 / 2 brightness viewing angle and the penetrating light brightness of the different embodiments and the comparative example are compared to embody the technical effect of the present application, and the brightness percentage is based on the brightness of Example 1.

[0074] Test method: Vertical direction 1 / 2 viewing angle: the vertical direction brightness decreases to 1 / 2 of the center brightness, which is the vertical direction 1 / 2 viewing angle. Parallel direction 1 / 2 viewing angle: the parallel direction brightness decreases to 1 / 2 of the center brightness, which is the parallel direction 1 / 2 viewing angle.

[0075] Brightness: BM-7 is used to measure the brightness of the center position of the backlight.

[0076] Angle brightness line graph: the brightness is measured from -90° to 90° in a certain direction, and finally the angle brightness line graph is obtained.

[0077] The embodiments must meet the setting conditions of the microstructure of the present application: Example 1 The prism structure in the expanded view angle structure is an isosceles right prism with a width W1 of 20 μm, and the number S of prisms in the interval region between every two adjacent polygonal microstructures is 1. The projected width of the first inclined surface region A of the polygonal microstructure is 2 μm, the projected width of the second inclined surface region B is 2 μm, the width of the top region C is 2 μm, the angle of the first inclined surface 1 is 70°, the angle of the second inclined surface 2 is 60°, and the angle of the top acute angle is 170°.

[0078] At this time, the test results of the view angle expansion film are as follows: the vertical 1 / 2 view angle is 74°, the parallel 1 / 2 view angle is 65°, and the brightness is 100%.

[0079] Example 2 The difference between Example 2 and Example 1 is that the number S of prisms in the interval region between every two adjacent polygonal microstructures is 3.

[0080] At this time, the test results of the view angle expansion film are as follows: the vertical 1 / 2 view angle is 66°, the parallel 1 / 2 view angle is 63°, and the brightness is 105.53%.

[0081] Example 3 The difference between Example 3 and Example 1 is that the number S of prisms in the interval region between every two adjacent polygonal microstructures is 5.

[0082] At this time, the test results of the view angle expansion film are as follows: the vertical 1 / 2 view angle is 59°, the parallel 1 / 2 view angle is 57°, and the brightness is 110.24%.

[0083] Example 4 The difference between Example 4 and Example 1 is that the projected width of the first inclined surface region A of the polygonal microstructure is 5 μm.

[0084] At this time, the test results of the view angle expansion film are as follows: the vertical 1 / 2 view angle is 78°, the parallel 1 / 2 view angle is 67°, and the brightness is 98.89%.

[0085] Example 5 The difference between Example 5 and Example 1 is that the projected width of the second inclined surface region B is 5 μm.

[0086] At this time, the test results of the view angle expansion film are as follows: the vertical 1 / 2 view angle is 77°, the parallel 1 / 2 view angle is 66°, and the brightness is 98.35%.

[0087] Example 6 The difference between Example 6 and Example 1 is that the width of the top region C of the microstructure is 5 μm.

[0088] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 73°, the 1 / 2 viewing angle in the parallel direction is 69°, and the brightness is 97.16%.

[0089] Example 7 Example 7 is different from Example 1 in that the angle of the first inclined surface 1 is 80°.

[0090] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 78°, the 1 / 2 viewing angle in the parallel direction is 67°, and the brightness is 97.99%.

[0091] Example 8 Example 8 is different from Example 1 in that the angle of the second inclined surface 2 is 50°.

[0092] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 80°, the 1 / 2 viewing angle in the parallel direction is 69°, and the brightness is 96.32%.

[0093] Example 9 Example 9 is different from Example 1 in that the angle of the top large acute angle is 175°.

[0094] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 77°, the 1 / 2 viewing angle in the parallel direction is 68°, and the brightness is 99.91%.

[0095] Example 10 Example 10 is different from Example 1 in that the prism structure is an isosceles right prism with a width of 15 μm.

[0096] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 76°, the 1 / 2 viewing angle in the parallel direction is 70°, and the brightness is 95.26%.

[0097] Comparative Example 1 Comparative Example 1 is different from Example 1 in that the pure polyhedral structure viewing angle expansion film has the same polyhedral structure as Example 1, and the gap is not filled with a prism structure.

[0098] At this time, the test results of the viewing angle expansion film are as follows: the 1 / 2 viewing angle in the vertical direction is 78°, the 1 / 2 viewing angle in the parallel direction is 71°, and the brightness is 75.37%.

[0099] The results of each example and comparative example are shown in Table 1. Table 1 From the above test results, it can be seen that: From Examples 1-10 and Comparative Example 1, it can be seen that, compared with the no-prism structure of the viewing angle expanding film of Comparative Example 1, the brightness of the central viewing angle is effectively improved under the condition of retaining a large viewing angle, that is, the new compound structure of the multi-faceted structure combined with the prism structure can effectively adjust the distribution of the light passing through the optical film, thereby improving the light intensity of the direct viewing angle while maintaining the brightness of the large viewing angle.

[0100] The application also relates to a display device comprising the viewing angle expanding film.

[0101] It should be known that the use mode of the application is to externally attach the viewing angle expanding film to the screen.

[0102] The preferred embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the specific details in the above-described embodiments, and various equivalent transformations can be made to the technical solutions of the application within the technical concept range of the application, and these equivalent transformations all belong to the protection range of the application.

Claims

1. A viewing angle expansion film, characterized in that: include: a substrate layer (40); A plurality of polyhedral structures (50) are arranged in an array along a preset direction and spaced apart on the substrate layer (40); and A plurality of prism structures (60) are arranged in an array in equal parts between adjacent polyhedral structures (50); The number of the prism structures (60) between adjacent polyhedral structures (50) is 1-5, and a composite microstructure is formed by alternately extending the array, so that the composite microstructure has wide viewing angle and high brightness optical performance.

2. The viewing angle widening film according to claim 1, wherein The prism structure (60) is an isosceles right-angle structure, and its prism width W1 is 15-20 μm.

3. The viewing angle widening film according to claim 1, wherein: The polyhedral structure (50) comprises: a trapezoidal bottom layer (10); Two first oblique sides (101) are arranged oppositely on two sides of the trapezoidal bottom layer (10); a trapezoidal middle layer (20), the bottom side of which coincides with the top side of the trapezoidal bottom layer (10); and Two second oblique sides (201) are arranged opposite to each other on both sides of the trapezoidal middle layer (20) and are respectively connected to the two first oblique sides (101); a top layer (30) whose bottom edge coincides with the top edge of the trapezoidal middle layer (20); and Two third oblique edges (301) are arranged oppositely on both sides of the top layer (30) to form a vertex angle, and are respectively connected to the two second oblique edges (201); The cross sections of the trapezoidal bottom layer (10) and the trapezoidal middle layer (20) are both isosceles trapezoids in the same direction, and the angle between the first hypotenuse (101) and the horizontal line is greater than the angle between the second hypotenuse (201) and the horizontal line; and the top layer (30) is an isosceles triangle with a vertex angle greater than or equal to 170°.

4. The viewing angle widening film according to claim 3, wherein: The trapezoidal bottom layer (10), the trapezoidal middle layer (20) and the top layer (30) are made of the same material and have inclined surfaces with different slopes to form an optical modulation unit without an actual stacking interface.

5. The viewing angle widening film according to claim 3, wherein: The trapezoidal bottom layer (10) is formed by the two first oblique sides (101) to form a first oblique area (A), the trapezoidal middle layer (20) is formed by the two second oblique sides (201) to form a second oblique area (B), and the top layer (30) is formed by the top region (C); The slopes of the first slope region (A), the second slope region (B) and the top region (C) are all different.

6. The viewing angle widening film according to claim 5, wherein: The projection width of the first slope region (A) at the bottom is 1-5 μm; The projection width of the second slope region (B) at the bottom is 1-5 μm; The top layer (30) forms a top region (C) with a projection width of 1-5 μm at the bottom.

7. The viewing angle widening film according to claim 5, wherein: The numerical range of the first angle between the first oblique side (101) and the horizontal line is 60°-80°, and the numerical range of the second angle between the second oblique side (201) and the horizontal line is 50°-70°.

8. The viewing angle widening film according to claim 3, wherein: The top angle of the top layer (30) is greater than or equal to 170° and less than 180°.

9. The viewing angle widening film according to claim 3, wherein: A top of the first oblique side is connected to a bottom of the second oblique side, and a top of the second oblique side is connected to a bottom of the third oblique side, so as to form a polygonal microstructure; The absolute value of the slope of the first oblique side, the absolute value of the slope of the second oblique side, and the absolute value of the slope of the third oblique side decrease in order from bottom to top.

10. A display device, characterized in that The method comprises the viewing angle-enlarging film according to any one of claims 1 to 9.

Images