A brightness enhancement film, a backlight module, and a display screen.

Abstract

This invention provides a brightness enhancement film, a backlight module, and a display screen. The brightness enhancement film includes a substrate and a prism structure layer disposed on the substrate. The prism structure layer includes a plurality of prisms, each prism including a base and a pyramid located on the base. The upper and lower surfaces of the base are connected by an arc surface. The prism of this invention uses a pyramid at the top and a base with an arc structure at the bottom. Compared to traditional prism structures that only have two sides to refract or reflect light, the pyramid has multiple sides, refracting and reflecting light from multiple directions to produce better light focusing, improve brightness and transmittance. At the same time, the arc structure at the bottom enhances light penetration, further improving brightness and thus the brightness of the backlight module. Furthermore, the arc structure at the bottom acts as a convex lens, enabling the brightness enhancement film to have a naked-eye 3D film effect when combined with 3D software.

Description

Technical Field

[0001] This invention relates to the application of brightness enhancement films, and more particularly to a brightness enhancement film, a backlight module, and a display screen. Background Technology

[0002] Brightness enhancement films have diverse applications. For example, they are used in mobile phone screens to enable in-display fingerprint unlocking. The principle of in-display fingerprint unlocking is based on the screen's self-illuminating and ultra-thin characteristics, allowing light to penetrate the cover plate and illuminate the fingerprint. The fingerprint reflects light, penetrates the screen, and returns to the sensor for recognition, thereby unlocking the device. To improve the recognition accuracy of in-display fingerprints, the market demands increasingly higher levels of brightness enhancement films. Among these, increasing transmittance and improving brightness have become basic requirements. Traditional brightness enhancement films consist of multiple prism structures and a substrate, with only two sides facing each other between adjacent prism structures (e.g., the cross-section of a prism is triangular, and the opposing surfaces between two adjacent prisms form a V-groove or slot). Traditional prism structures cannot further meet the demands for increased transmittance and improved brightness. Summary of the Invention

[0003] This invention provides a brightness enhancement film, a backlight module, and a display screen. The main technical problem it solves is that the existing brightness enhancement film structure, which consists of multiple adjacent prism structures with only two sides facing each other (such as prisms with triangular cross-sections and V-grooves or slots formed between adjacent prisms) and a substrate, cannot further meet the needs of increasing transmittance and improving brightness.

[0004] To solve the above-mentioned technical problems, the present invention provides a brightness enhancement film, which includes a substrate and a prism structure layer disposed on the substrate;

[0005] The prism structure layer includes a plurality of prisms, each prism including a base and a pyramid located on the base, the upper and lower surfaces of the base being connected by the arc surface.

[0006] Optionally, the length and width of the base range from 10μm to 100μm.

[0007] Optionally, the area of ​​the upper surface of the base is larger than the area of ​​the base of the pyramid.

[0008] Optionally, the upper surface area of ​​the base is smaller than the lower surface area to form an inclined arc surface.

[0009] Optionally, the height of the arc surface of the base ranges from 0.5 μm to 10 μm.

[0010] Optionally, the plurality of prisms are arranged in a matrix array.

[0011] Optionally, the pyramid in the prism is a square pyramid, and the pyramidal surfaces are all isosceles triangles.

[0012] Optionally, the vertex angle of the pyramidal face is 30 to 160 degrees.

[0013] Furthermore, the present invention also provides a backlight module comprising the brightness enhancement film as described above.

[0014] Furthermore, the present invention also provides a display screen, which includes the backlight module as described above.

[0015] Beneficial effects

[0016] This invention provides a brightness enhancement film, a backlight module, and a display screen. The brightness enhancement film includes a substrate and a prism structure layer disposed on the substrate. The prism structure layer includes a plurality of prisms, each prism including a base and a pyramid located on the base. The upper and lower surfaces of the base are connected by an arc surface. The prism of this invention uses a pyramid at the top and a base with an arc structure at the bottom. Compared with traditional prism structures that only have two sides to refract or reflect light, the pyramid has multiple sides, refracting and reflecting light from multiple directions to produce better light focusing, improve brightness and transmittance. At the same time, the arc structure at the bottom enhances light penetration, further improving brightness and thus the brightness of the backlight module. Furthermore, the arc structure at the bottom acts as a convex lens, enabling the brightness enhancement film to have a naked-eye 3D film effect when combined with 3D software. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a brightness enhancement film provided in various embodiments of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of a prism provided in various embodiments of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a brightness enhancement film provided in various embodiments of the present invention. Figure 2 ;

[0020] Figure 4 A schematic diagram of the structure of a brightness enhancement film provided in various embodiments of the present invention. Figure 3 ;

[0021] Figure 5 This is a schematic diagram of another prism structure provided in various embodiments of the present invention;

[0022] Figure 6 This is a schematic diagram of another prism structure provided in various embodiments of the present invention. Detailed Implementation

[0023] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] Example 1:

[0025] To address the issue that existing brightness enhancement film structures, consisting of multiple prism strips for light convergence and a substrate, cannot further meet the demands for increased transmittance and brightness, this embodiment provides a brightness enhancement film, such as... Figure 1 As shown, the brightness enhancement film includes a substrate 101 and a prism structure layer disposed on the substrate 101; the prism structure layer is composed of a plurality of prisms 102, such as... Figure 2 As shown, the prism 102 includes a base 1021 and a pyramid 1022 located on the base. The upper surface 1021a and the lower surface 1021b of the base are connected by the arc surface 1021c.

[0026] In this embodiment, the pyramid 1022 and the base 1021 are made of the same material. The pyramid 1022 is located at the center of the base 1021, and the area of ​​the upper surface 1021a of the base 1021 is larger than the area of ​​the base surface of the pyramid 1022. As a result, the surface of the base 1021 allows vertical light to pass through directly, while other light can be reflected by the cone surface of the pyramid 1022, reducing light damage and increasing brightness.

[0027] Better, such as Figure 2 As shown, the prisms 102 on the prism structure layer are all the same in size, shape, and height; of course, in some embodiments, the prisms 102 on the prism structure layer are different in size, shape, and height, which can be flexibly adjusted according to actual needs; wherein, in this embodiment, the prisms 102 can be arranged in a matrix array, and the bases 1021 of any two adjacent prisms 102 are connected sequentially, as shown. Figure 2 As shown; in some embodiments, the prisms 102 can also be arranged irregularly, for example, the prisms 102 are arranged at unequal intervals, such as... Figure 3 As shown, the spacing between the prisms 102 is unequal, and the spacing increases sequentially; in some embodiments, such as Figure 4 As shown, the spacing of the prism 102 support does not follow any pattern.

[0028] Preferably, the base 1021 of the prism 102 is quadrilateral, meaning that both the upper surface 1021a and the lower surface 1021b of the base 1021 have four sides; wherein the length W1 and width W2 of the base 1021 range from 10μm to 100μm. Of course, the length W1 and width W2 of the base 1021 can be equal or unequal, for example... Figure 2 W1 is 50 μm and W2 is 20 μm.

[0029] It is worth noting that, since the upper surface 1021a and lower surface 1021b of the base 1021 are connected by an arc surface 1021c, in this embodiment, the four sides of the lower surface 1021b of the base 1021 can be straight lines, and the four sides of the upper surface 1021a can be curved lines. The arc surface 1021c is formed by the straight lines of the lower surface 1021b and the curved lines of the upper surface 1021a. Figure 2 As shown; in some embodiments, the four sides of the upper surface 1021a of the base 1021 may be straight lines, and the four sides of the lower surface 1021b may be curved, forming an arc surface 1021c through the straight lines of the upper surface 1021a and the arcs of the lower surface 1021b, as shown. Figure 5 As shown. It can be understood that the arc shape of the arc surface 1021c includes, but is not limited to, regular arc lines, wavy arcs, etc., such as... Figure 6 As shown.

[0030] In this embodiment, the arc surface 1021c of the base 1021 can be an inclined arc surface 1021c. Preferably, the area of ​​the upper surface 1021a of the base 1021 is smaller than the area of ​​the lower surface 1021b, so as to form an inclined arc surface 1021c. At this time, the upper surface 1021a of the base 1021 allows some vertical light to pass through directly, and some light is less damaged after passing through the angle of the two inclined arc surfaces 1021c, which can effectively improve the brightness and the light penetration is better. Of course, in some embodiments, the arc surface 1021c can also be a vertical arc surface 1021c, that is, the area of ​​the upper surface 1021a of the base 1021 is the same as the area of ​​the lower surface 1021b.

[0031] It is understandable that the base 1021 includes four arc surfaces 1021c, and each arc surface 1021c can be the same or different; when the arc surfaces 1021c are different, their heights can be different. Preferably, the height range of the arc surfaces 1021c of the base 1021 is 0.5μm to 10μm, such as... Figure 2 As shown, the height H1 of the front arc surface 1021c is 2μm, and the height H2 of the side arc surface 1021c is 1μm. Since the size of the bottom arc surface structure can be adjusted, the 3D effect of the brightness enhancement film in this embodiment will also be improved.

[0032] It should be noted that, in this embodiment, the pyramid 1022 on the base 1021 can be a regular pyramid 1022. This pyramid 1022 can also be tilted at any angle as needed, meaning the vertex of the pyramid 1022 can be tilted towards any cone face. The pyramid 1022 includes, but is not limited to, triangular pyramids 1022, square pyramids 1022, pentagonal pyramids 1022, etc. Since the base 1021 is quadrilateral, optionally, the pyramid 1022 is a square pyramid 1022 composed of four cone faces. In this embodiment, the four cone faces of the prism are all isosceles triangles. The vertex angles of each isosceles triangle can be the same or different. The vertex angle of each cone face of the square pyramid 1022 is 30 to 160 degrees; for example, the cone faces of the square pyramid 1022 are all isosceles triangles, and the vertex angle of each cone face is 90°.

[0033] It is understood that in this embodiment, the substrate 101 includes, but is not limited to, polyethylene terephthalate (PET) or polycarbonate (PC). PET substrate 101 has good thermoplasticity, low specific gravity, and resistance to chemical corrosion, while PC substrate 101 has high mechanical properties, good heat aging resistance, and strong solvent resistance. The material of the prism structure layer includes, but is not limited to, ultraviolet-curable resin, selected from epoxy acrylate resin, amino acrylate resin, polyethylene resin, polyurethane acrylate resin, and polyester acrylate resin.

[0034] This embodiment provides a brightness enhancement film, which includes a substrate and a plurality of prisms arranged in a matrix array on the substrate. Each prism includes a base and a pyramid on the base. The area of ​​the upper surface of the base is larger than the area of ​​the base of the pyramid. The upper surface of the base allows vertical light to pass through directly. Since the number of pyramidal faces is greater than the two faces of a traditional prism, light from other directions is refracted and reflected by multiple inclined pyramidal faces, resulting in less light loss and effectively improving brightness. At the same time, the upper and lower surfaces of the base are connected by an arc surface, which enhances the light penetration and further improves brightness.

[0035] Example 2:

[0036] This embodiment provides a more specific brightness enhancement film. The preparation method of the brightness enhancement film is as follows: PET or PC raw materials are extruded to form a substrate, the upper surface of the substrate is coated with a UV-curable resin layer, and the UV-curable resin is pressed by a mold wheel with a complementary structure to the prism structure layer to obtain the brightness enhancement film.

[0037] like Figure 1As shown, the brightness enhancement film includes a PET substrate and a prism structure layer on the PET substrate. The prism structure layer is a rectangular array composed of several prism structures of equal height, and the bottoms of each prism structure in each row are connected in sequence, and the bottoms of each prism structure in each column are connected in sequence.

[0038] In this embodiment, the prism includes a base 1021 and a square pyramid 1022 made of the same material. The square pyramid 1022 is located at the center of the base 1021, and the area of ​​the upper surface 1021a of the base 1021 is larger than the area of ​​the base of the square pyramid 1022. The base 1021 is quadrilateral, with a length of 60 μm and a width of 80 μm. The lower surface 1021b of the base 1021 is a plane enclosed by four straight lines, and the upper surface 1021a is a plane enclosed by four arc lines. The upper surface 1021a and the lower surface 1021b of the base 1021 are connected by an arc surface 1021c, which is enclosed by the straight lines of the lower surface 1021b and the arcs of the upper surface 1021a. Specifically, the upper surface 1021a of the base 1021... The area is smaller than that of the lower surface 1021b to form an inclined arc surface 1021c. It can be understood that the base 1021 includes four arc surfaces 1021c, each with the same height, ranging from 0.5μm to 10μm, such as 4μm. In this embodiment, the plane of the base 1021, which is made of the same material as the pyramid 1022, allows vertical light to pass through. Some light is less damaged when passing through the angle of the two inclined arc surfaces 1021c, which can effectively improve brightness and allow for better light penetration.

[0039] In this embodiment, the prism's pyramidal structure 1022 can be tilted at any angle as needed. Each facet of the pyramid 1022 is a triangle, and the apex angles of each facet can be equal or unequal, ranging from 30 to 160 degrees. For example, each facet of the pyramid 1022 can be an isosceles triangle with a 90-degree apex angle. The four-faceted structure, compared to a traditional prism structure with only two faces, refracts and reflects light from multiple directions to produce better light focusing, improving brightness and transmittance. Furthermore, the cone angles can be adjusted as needed, eliminating the need for angle adjustments in the punching die, resulting in higher product utilization. One more sheet of the same length can be punched, and the width is relatively narrower.

[0040] Example 3:

[0041] This embodiment provides a backlight module, which includes the brightness enhancement film of Embodiment 1 and / or Embodiment 2 described above. The brightness enhancement film includes a prism structure layer on the substrate. The prism structure layer includes a plurality of prisms arranged in a matrix array. Each prism includes a base and a pyramid located on the base. The upper and lower surfaces of the base are connected by the arc surface. The specific structure of the brightness enhancement film is as described in Embodiment 1 or Embodiment 2 described above, and will not be repeated here.

[0042] This embodiment also provides a display screen, which includes the aforementioned backlight module. The pyramidal structure of the brightness enhancement film in this embodiment can increase transmittance and improve the recognition of under-display fingerprints. The pyramid has at least three cone surfaces, which is brighter and has better transmittance than the traditional prism structure with only two sides facing each other. At the same time, the base with the bottom arc structure enhances the light penetration and further improves the brightness, making it easier to recognize under-display fingerprints. Moreover, since the bottom is arc-shaped, it has a convex lens effect and, when combined with 3D software, has the effect of a naked-eye 3D film.

[0043] It should be understood that the light film provided in this embodiment can be applied to various light-emitting fields. For example, it can be made into a backlight module for use in the display backlight field (which can be a backlight module for terminals such as televisions, monitors, and mobile phones). In this case, it can be applied to backlight modules. It can also be applied to button backlighting, photography, home lighting, medical lighting, decoration, automotive, and transportation fields. When applied to button backlighting, it can serve as a backlight source for buttons on devices with buttons such as mobile phones, calculators, and keyboards; when applied to photography, it can be made into a camera flash; when applied to home lighting, it can be made into floor lamps, table lamps, lighting lamps, ceiling lights, downlights, and spotlights; when applied to medical lighting, it can be made into surgical lights and low-electromagnetic lighting lamps; when applied to decoration, it can be made into various decorative lights, such as various colored lights, landscape lighting, and advertising lights; when applied to the automotive field, it can be made into car lights and car indicator lights; and when applied to the transportation field, it can be made into various traffic lights and streetlights. The above applications are merely a few examples of applications exemplified in this embodiment. It should be understood that the applications of light-emitting films are not limited to the few fields exemplified above.

[0044] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A brightness enhancement film, characterized in that, The brightness enhancement film includes a substrate and a prism structure layer disposed on the substrate; The prism structure layer includes a plurality of prisms, each prism including a base and a pyramid located on the base. The base and the pyramid correspond one-to-one. The upper and lower surfaces of the base are connected by an arc surface. One of the edges of the upper surface and the lower surface is a straight line, and the other edge is an arc. The straight edge and the arc edge enclose the arc surface. The area of ​​the upper surface of the base is smaller than the area of ​​the lower surface to form the inclined arc surface.

2. The brightness enhancement film as described in claim 1, characterized in that, The length and width of the base range from 10μm to 100μm.

3. The brightness enhancement film as described in claim 1, characterized in that, The area of ​​the upper surface of the base is greater than the area of ​​the base of the pyramid.

4. The brightness enhancement film as described in claim 1, characterized in that, The height of the arc surface of the base ranges from 0.5μm to 10μm.

5. The brightness enhancement film according to any one of claims 1-4, characterized in that, The prisms are arranged in a matrix array.

6. The brightness enhancement film as described in claim 5, characterized in that, The pyramid in the prism is a square pyramid, and the pyramidal surfaces are all isosceles triangles.

7. The brightness enhancement film as described in claim 6, characterized in that, The vertex angle of the pyramidal face is 30 to 160 degrees.

8. A backlight module, characterized in that, The backlight module includes the brightness enhancement film as described in any one of claims 1-7.

9. A display screen, characterized in that, The display screen includes the backlight module as described in claim 8.

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