Touch film with wide viewing angle

Abstract

The utility model provides a touch film with a wide viewing angle, and belongs to the technical field of liquid crystal display. A touch sensor layer formed on the first surface of the substrate layer; the optical structure layer comprises a first curing adhesive layer which is formed on the second surface of the base material layer; the second curing adhesive layer is formed on one surface, far away from the base material layer, of the first curing adhesive layer; the surface, connected with the second curing adhesive layer, of the first curing adhesive layer is of a plurality of isosceles trapezoid microstructures arranged at intervals. The refractive index of the first curing adhesive layer is smaller than that of the second curing adhesive layer. The liquid crystal display has the advantages that the optical structure layer is arranged on the face, opposite to the touch sensor layer, of the base material layer, the curing adhesive layers with different refractive indexes are adopted in the optical structure layer, and the isosceles trapezoid microstructures arranged at intervals are arranged on the connected surfaces of the curing adhesive layers, so that the problems that an existing liquid crystal display is small in visual angle and poor in stability are solved. And meanwhile, the contrast ratio of liquid crystal display is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a touch film with a wide viewing angle. Background Art

[0002] As one of the current mainstream display technologies, liquid crystal displays (LCDs) have been widely used in various electronic devices due to their advantages such as low power consumption, high resolution, light weight and portability. However, despite the continuous advancement of LCD technology, its inherent viewing angle limitation remains a problem that needs to be solved urgently.

[0003] The viewing angle of a liquid crystal display refers to the maximum angle range within which the screen image remains clear and color is not distorted when the screen deviates from the normal direction to the left or right or up and down. Due to the limitations of the arrangement of liquid crystal molecules and the design of the backlight module, the display effect of traditional LCDs at side viewing angles often suffers from problems such as decreased contrast, color shift or uneven brightness, which greatly reduces the image quality and affects the user's viewing experience.

[0004] This problem of small viewing angle and insufficient side viewing angle is particularly prominent in scenarios where multiple people need to share the screen or watch from different angles. For example, in conference rooms, classrooms, or exhibitions, since the audience may be located at different positions on the screen, poor display effects at side viewing angles will directly affect the transmission and reception of information. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a touch film with a wide viewing angle.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] A touch film with a wide viewing angle, comprising:

[0008] A substrate layer, the substrate layer comprising a first surface and a second surface facing away from the first surface;

[0009] A touch sensor layer formed on the first surface of the substrate layer;

[0010] The optical structure layer is formed on the second surface of the substrate layer; wherein the optical structure layer comprises:

[0011] A first cured adhesive layer formed on the second surface of the substrate layer;

[0012] A second cured adhesive layer is formed on a side of the first cured adhesive layer away from the substrate layer;

[0013] The surface where the first cured adhesive layer and the second cured adhesive layer meet presents a plurality of isosceles trapezoidal microstructures arranged at intervals; and the refractive index of the first cured adhesive layer is smaller than the refractive index of the second cured adhesive layer.

[0014] Preferably, the refractive index difference between the second cured adhesive layer and the first cured adhesive layer is in the range of 0.05-0.25.

[0015] Preferably, the refractive index of the first cured adhesive layer is 1.36 to 1.56;

[0016] The refractive index of the second cured adhesive layer is 1.58-1.80.

[0017] Preferably, the base angle corresponding to the lower base of the isosceles trapezoidal microstructure ranges from 65.0° to 85.0°;

[0018] The intersection angle of the waist extension line of the isosceles trapezoidal microstructure ranges from 20.0° to 45.0°.

[0019] Preferably, the upper base of the isosceles trapezoidal microstructure is 4.0 μm to 15.0 μm;

[0020] The ratio of the height to the lower base of the isosceles trapezoidal microstructure is 0.4 to 1.5.

[0021] Preferably, the touch sensor layer comprises:

[0022] A third cured adhesive layer formed on the first surface of the substrate layer;

[0023] A plurality of first conductive metal layers are formed in the third cured adhesive layer; the plurality of first conductive metal layers are arranged in an interval manner;

[0024] A first optical adhesive layer is formed on a side of the third curing adhesive layer away from the substrate layer;

[0025] A second substrate layer is formed on a side of the first optical adhesive layer away from the third curing adhesive layer;

[0026] a fourth cured adhesive layer, formed on a side of the second substrate layer away from the first optical adhesive layer;

[0027] A plurality of second conductive metal layers are formed in the fourth cured adhesive layer; the plurality of second conductive metal layers are arranged in an interval manner;

[0028] The second optical adhesive layer is formed on a side of the fourth curing adhesive layer away from the second substrate layer.

[0029] Preferably, the touch sensor layer comprises:

[0030] A third cured adhesive layer formed on the first surface of the substrate layer;

[0031] A plurality of first conductive metal layers are formed in the third cured adhesive layer; the plurality of first conductive metal layers are arranged in an interval manner;

[0032] a fourth cured adhesive layer, formed on a side of the third cured adhesive layer away from the substrate layer;

[0033] A plurality of second conductive metal layers are formed in the fourth cured adhesive layer; the plurality of second conductive metal layers are arranged in an interval manner;

[0034] The second optical adhesive layer is formed on a side of the fourth curing adhesive layer away from the third curing adhesive layer.

[0035] Preferably, the thickness of the first conductive metal layer is less than the thickness of the third cured adhesive layer;

[0036] The thickness of the second conductive metal layer is smaller than the thickness of the fourth curing adhesive layer.

[0037] Preferably, the thickness of the third cured adhesive layer and the fourth cured adhesive layer are 6 μm to 40 μm respectively;

[0038] The thickness of the first conductive metal layer and the second conductive metal layer are 1 μm to 20 μm respectively.

[0039] The advantages or beneficial effects of the technical solution of the utility model are:

[0040] The utility model arranges an optical structure layer on the side of the substrate layer facing away from the touch sensor layer. The optical structure layer adopts a cured adhesive layer with different refractive indices, and the connected surfaces of the cured adhesive layer present a plurality of isosceles trapezoidal microstructures arranged at intervals, so as to solve the problems of small viewing angle and insufficient side viewing angle of the existing liquid crystal display, and at the same time improve the contrast of the liquid crystal display. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a touch film with a wide viewing angle in a preferred embodiment of the present invention;

[0042] Figure 2 This is an enlarged schematic diagram of a touch film with a wide viewing angle in a preferred embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of a touch film with a wide viewing angle in another preferred embodiment of the present invention;

[0044] Figure 4 FIG. 1 is an enlarged schematic diagram of a touch film with a wide viewing angle in another preferred embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 100, substrate layer; 200, touch sensor layer; 201, third cured adhesive layer; 202, first conductive metal layer; 203, first optical adhesive layer; 204, second substrate layer; 205, fourth cured adhesive layer; 206, second conductive metal layer; 207, second optical adhesive layer; 300, optical structure layer; 301, first cured adhesive layer; 302, second cured adhesive layer; L1 represents light 1; L2 represents light 2. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0050] Example 1

[0051] See also Figure 1 and Figure 2 In a preferred embodiment of the present invention, based on the above problems existing in the prior art, a touch film with a wide viewing angle is provided, comprising:

[0052] The substrate layer 100 includes a first surface and a second surface facing away from the first surface;

[0053] The touch sensor layer 200 is formed on the first surface of the substrate layer 100;

[0054] The optical structure layer 300 is formed on the second surface of the substrate layer 100; wherein the optical structure layer 300 includes:

[0055] A first cured adhesive layer 301 is formed on the second surface of the substrate layer 100;

[0056] The second cured adhesive layer 302 is formed on a side of the first cured adhesive layer 301 away from the substrate layer 100;

[0057] The surface where the first cured adhesive layer 301 and the second cured adhesive layer 302 meet presents a plurality of isosceles trapezoidal microstructures arranged at intervals; the refractive index of the first cured adhesive layer 301 is smaller than the refractive index of the second cured adhesive layer 302 .

[0058] Specifically, in this embodiment, an optical structure layer 300 is provided on the side of the substrate layer 100 facing away from the touch sensor layer 200. The optical structure layer 300 adopts a cured adhesive layer with different refractive indices, and the connected surfaces of the cured adhesive layer present a plurality of isosceles trapezoidal microstructures arranged at intervals. This improves the viewing angle of the touch film, solves the problems of small viewing angle and insufficient side viewing angle of existing liquid crystal displays, and improves the contrast of the liquid crystal display.

[0059] As a preferred embodiment, the difference in refractive index between the second curing adhesive layer 302 and the first curing adhesive layer 301 is in the range of 0.05-0.25.

[0060] In this embodiment, the curing adhesive layers, including the first curing adhesive layer 301 , the second curing adhesive layer 302 , and the third curing adhesive layer 201 and the fourth curing adhesive layer 205 described below, can all be made of ultraviolet curing adhesive (UV adhesive).

[0061] As a preferred embodiment, the refractive index of the first cured adhesive layer 301 is 1.36 to 1.56;

[0062] The refractive index of the second curing adhesive layer 302 is 1.58-1.8.

[0063] Specifically, in this embodiment, the first curing adhesive layer 301 is a low-refractive-index UV adhesive layer, and the second curing adhesive layer 302 is a high-refractive-index UV adhesive layer.

[0064] The refractive index N1 of the low-refractive-index UV adhesive layer is in the range of 1.36 to 1.56, and more preferably in the range of 1.39 to 1.53.

[0065] The refractive index N2 of the high refractive index UV adhesive layer is in the range of 1.58 to 1.80, and more preferably in the range of 1.60 to 1.75.

[0066] The refractive index difference ΔN(N2-N1) between the second curing adhesive layer 302 and the first curing adhesive layer 301 is in the range of 0.05 to 0.25.

[0067] Furthermore, the first cured adhesive layer 301 has an isosceles trapezoidal pattern on one side away from the substrate layer 100, and a plurality of isosceles trapezoidal patterns are arranged at intervals. The second cured adhesive layer 302 is directly formed on the flat portion above the isosceles trapezoidal pattern and between adjacent isosceles trapezoidal patterns in the patterned first cured adhesive layer 301, that is, the second cured adhesive layer 302 has an isosceles trapezoidal pattern on one side close to the first cured adhesive layer 301.

[0068] In an isosceles trapezoid, the two parallel sides are called the bases of the trapezoid. The longer base is called the lower base, while the shorter base is called the upper base.

[0069] As a preferred embodiment, the base angle θ1 corresponding to the lower base of the isosceles trapezoidal microstructure ranges from 65.0° to 85.0°, or is 65.0°, 67.0°, 69.0°, 71.0°, 73.0°, 75.0°, 77.0°, 79.0°, 81.0°, 83.0°, 85.0°. Further preferably, the base angle is 71.0° to 75.0°.

[0070] As a preferred embodiment, the intersection angle θ2 of the waist extension line of the isosceles trapezoidal microstructure is in the range of 20.0° to 45.0°, or 20.0°, 28.0°, 30.0°, 32.0°, 34.0°, 36.0°, 38.0°, 45.0°. The further preferred angle is 25.0° to 40.0°.

[0071] As a preferred embodiment, the upper base of the isosceles trapezoidal microstructure is 4.0 μm to 15.0 μm, and the upper base is more preferably 5.0 to 12 μm.

[0072] As a preferred embodiment, the ratio of the height to the lower base of the isosceles trapezoidal microstructure is 0.4-1.5, and the ratio is further preferably 0.6-1.2.

[0073] As a preferred embodiment, the touch sensor layer 200 includes:

[0074] A third cured adhesive layer 201 is formed on the first surface of the substrate layer 100;

[0075] A plurality of first conductive metal layers 202 are formed in the third cured adhesive layer 201; the plurality of first conductive metal layers 202 are arranged in an alternate arrangement;

[0076] A first optical adhesive (OCA) layer 203 is formed on a side of the third curing adhesive layer 201 away from the substrate layer 100;

[0077] The second substrate layer 204 is formed on a side of the first optical adhesive layer 203 away from the third curing adhesive layer 201;

[0078] The fourth cured adhesive layer 205 is formed on a side of the second substrate layer 204 away from the first optical adhesive layer 203;

[0079] A plurality of second conductive metal layers 206 are formed in the fourth cured adhesive layer 205; the plurality of second conductive metal layers 206 are arranged in an alternate arrangement;

[0080] The second optical adhesive (OCA) layer 207 is formed on a side of the fourth curing adhesive layer 205 away from the second substrate layer 204 .

[0081] Furthermore, the substrate layer 100 is used as the bottom film material of the touch sensor layer 200, and the second substrate layer 204 is used as the top film material of the touch sensor layer 200. Both the substrate layer 100 and the second substrate layer 204 can be made of polyethylene terephthalate (PET) material.

[0082] Further, the thickness of the substrate layer 100 and the second substrate layer 204 may be the same or different. The thickness of the substrate layer 100 and the second substrate layer 204 is 50 μm to 600 μm, respectively. By way of example and not limitation, the thickness of the substrate layer 100 and the second substrate layer 204 is 600 μm, 500 μm, 400 μm, 300 μm, 250 μm, 188 μm, 125 μm, 100 μm, 75 μm, 50 μm; the thickness is further preferably 125 μm, 188 μm and 250 μm.

[0083] Furthermore, the thickness of the first optical adhesive layer 203 and the second optical adhesive layer 207 are 50 μm to 300 μm, or 300 μm, 250 μm, 200 μm, 175 μm, 150 μm, 125 μm, 100 μm, 50 μm, and preferably 100 μm, 125 μm and 175 μm.

[0084] As a preferred embodiment, the thickness of the first conductive metal layer 202 is less than the thickness of the third cured adhesive layer 201;

[0085] The thickness of the second conductive metal layer 206 is smaller than the thickness of the fourth curing adhesive layer 205 .

[0086] As a preferred embodiment, the thickness of the third cured adhesive layer 201 and the fourth cured adhesive layer 205 are 6μm to 40μm, or 6μm, 10μm, 12μm, 15μm, 18μm, 20μm, 25μm, 30μm, 35μm, 40μm, and the thickness is further preferably 10μm, 12μm, 15μm and 20μm.

[0087] As a preferred embodiment, the thickness of the first conductive metal layer 202 and the second conductive metal layer 206 are 1 μm to 20 μm, or 1 μm, 3 μm, 5 μm, 7 μm, 10 μm, 15 μm, and the thickness is further preferably 3 μm, 5 μm, 7 μm and 10 μm.

[0088] Furthermore, the first conductive metal layer 202 and the second conductive metal layer 206 partially overlap in vertical projection. The first conductive metal layer 202 and the second conductive metal layer 206 each include a plurality of layers, and the number of layers corresponds to each other. A single first conductive metal layer 202 and a corresponding single second conductive metal layer 206 are vertically staggered, that is, they are roughly overlapped in vertical projection, but are offset, and the offset distance should be less than the width of a single conductive metal layer.

[0089] Furthermore, the conventional touch film includes a substrate layer 100 and a touch sensor layer 200, that is, from bottom to top, the substrate layer 100, the third cured adhesive layer 201 (including multiple first conductive metal layers 202), the first optical adhesive layer 203, the second substrate layer 204, the fourth cured adhesive layer 205 (including multiple second conductive metal layers 206), and the second optical adhesive layer 207 are arranged in sequence.

[0090] In this embodiment, a touch film of a multi-point capacitive screen is provided, and its preparation process includes the following steps:

[0091] On the back of the substrate layer 100 of the traditional touch film, a liquid UV glue with a low refractive index is added to the substrate layer 100, and a pattern is transferred to the Bottom substrate layer 100 through a mold to form a sandwich sealing structure; then, the first curing glue layer 301 is cured, and the mold is peeled off to obtain a semi-finished product with a periodically arranged unit optical structure; then, a liquid UV glue with a high refractive index is added to the surface of the first curing glue layer 301 of the semi-finished product to cover the mold to form a sandwich sealing structure, and the second curing glue layer 302 is cured, and the mold is peeled off to obtain a functional touch film.

[0092] Finally, the touch sensor layer 200 of the above structure is formed on the front of the substrate layer 100 by adopting the same process flow as the conventional touch film. That is, a UV adhesive layer (i.e., the third cured adhesive layer 201) is coated on the front of the bottom layer substrate layer 100, and a pattern is transferred to the third cured adhesive layer 201 through a bottom layer mold, and then the third cured adhesive layer 201 is cured, and the mold is peeled off to obtain the first conductive metal layer 202; then, an OCA adhesive layer (i.e., the first optical adhesive layer 203) is formed on the third cured adhesive layer 201 to form a first layer of conductive structure.

[0093] Next, a UV adhesive layer (i.e., a fourth cured adhesive layer 205) is coated on the front of the TOP layer substrate layer (i.e., the second substrate layer 204) in the same manner, and a pattern is transferred to the fourth cured adhesive layer 205 through a TOP layer mold. The fourth cured adhesive layer 205 is then cured, and the mold is peeled off to obtain a second conductive metal layer 206. Next, an OCA adhesive layer (i.e., a second optical adhesive layer 207) is formed on the fourth cured adhesive layer 205 to form a second conductive structure.

[0094] Finally, the first conductive structure of the Bottom layer and the second conductive structure functional film of the TOP layer are assembled together to prepare the final touch film.

[0095] In the above-mentioned preferred embodiment, by attaching the touch film to the front end of the liquid crystal display, the second cured adhesive layer 302 of the optical structure layer 300 is attached to the surface of the liquid crystal display device (not shown in the figure), and the light (such as L1 or L2) emitted by the liquid crystal display device passes through the optical structure layer 300, the substrate layer 100, and the touch sensor layer 200 to be emitted, thereby improving the existing liquid crystal display's small viewing angle and insufficient side viewing angle, and at the same time, the contrast of the LCD screen can be improved.

[0096] Example 2

[0097] See also Figure 3 and Figure 4 The embodiment of the utility model provides a touch film with a wide viewing angle, which also adopts an isosceles trapezoidal microstructure to improve the problem of small viewing angle and insufficient side viewing angle of existing liquid crystal displays. The difference is that the touch sensor layer 200 is formed by a single-layer substrate layer. Compared with the traditional structure, a layer of substrate and optical adhesive layer can be omitted, reducing the pressure of material (BOM) cost.

[0098] As a preferred embodiment, the conventional touch film includes a substrate layer 100 and a touch sensor layer 200, that is, from bottom to top, the substrate layer 100, the third cured adhesive layer 201 (including multiple first conductive metal layers 202), the fourth cured adhesive layer 205 (including multiple second conductive metal layers 206), and the second optical adhesive layer 207 are sequentially arranged. That is, the touch sensor layer 200 includes:

[0099] A third cured adhesive layer 201 is formed on the first surface of the substrate layer 100;

[0100] A plurality of first conductive metal layers 202 are formed in the third cured adhesive layer 201; the plurality of first conductive metal layers 202 are arranged in an alternate arrangement;

[0101] The fourth cured adhesive layer 205 is formed on a side of the third cured adhesive layer 201 away from the substrate layer 100;

[0102] A plurality of second conductive metal layers 206 are formed in the fourth cured adhesive layer 205; the plurality of second conductive metal layers 206 are arranged in an alternate arrangement;

[0103] The second optical adhesive (OCA) layer 207 is formed on a side of the fourth curing adhesive layer 205 away from the third curing adhesive layer 201 .

[0104] The advantages or beneficial effects of adopting the above technical solution are: the utility model arranges an optical structure layer on the side of the substrate layer facing away from the touch sensor layer, and the optical structure layer adopts a cured adhesive layer with different refractive indices, and the connected surfaces of the cured adhesive layer present a plurality of isosceles trapezoidal microstructures arranged at intervals, so as to solve the problems of small viewing angle and insufficient side viewing angle of existing liquid crystal displays, and at the same time improve the contrast of the liquid crystal display.

[0105] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A touch film with a wide viewing angle, characterized in that: include: A substrate layer, the substrate layer comprising a first surface and a second surface facing away from the first surface; A touch sensor layer formed on the first surface of the substrate layer; An optical structure layer is formed on the second surface of the substrate layer; wherein the optical structure layer comprises: A first cured adhesive layer formed on the second surface of the substrate layer; A second cured adhesive layer is formed on a side of the first cured adhesive layer away from the substrate layer; The surface where the first cured adhesive layer and the second cured adhesive layer meet presents a plurality of isosceles trapezoidal microstructures arranged at intervals; and the refractive index of the first cured adhesive layer is smaller than the refractive index of the second cured adhesive layer.

2. The touch film with a wide viewing angle according to claim 1, characterized in that: The refractive index difference between the second curing adhesive layer and the first curing adhesive layer is in the range of 0.05-0.

25.

3. The touch film with a wide viewing angle according to claim 1, characterized in that: The refractive index of the first cured adhesive layer is 1.36 to 1.56; The refractive index of the second cured adhesive layer is 1.58-1.

80.

4. The touch film with a wide viewing angle according to claim 1, characterized in that: The bottom angle corresponding to the lower base of the isosceles trapezoidal microstructure ranges from 65.0° to 85.0°; The intersection angle of the waist extension line of the isosceles trapezoidal microstructure is in the range of 20.0° to 45.0°.

5. The touch film with a wide viewing angle according to claim 1, characterized in that: The upper base of the isosceles trapezoidal microstructure is 4.0 μm to 15.0 μm; The ratio of the height to the lower base of the isosceles trapezoidal microstructure is 0.4 to 1.

5.

6. The touch film with a wide viewing angle according to claim 1, characterized in that: The touch sensor layer comprises: A third cured adhesive layer formed on the first surface of the substrate layer; A plurality of first conductive metal layers are formed in the third cured adhesive layer; the plurality of first conductive metal layers are arranged in an interval manner; A first optical adhesive layer is formed on a side of the third curing adhesive layer away from the substrate layer; A second substrate layer is formed on a side of the first optical adhesive layer away from the third curing adhesive layer; a fourth cured adhesive layer, formed on a side of the second substrate layer away from the first optical adhesive layer; A plurality of second conductive metal layers are formed in the fourth cured adhesive layer; the plurality of second conductive metal layers are arranged in an interval manner; The second optical adhesive layer is formed on a side of the fourth curing adhesive layer away from the second substrate layer.

7. The touch film with a wide viewing angle according to claim 1, characterized in that: The touch sensor layer comprises: A third cured adhesive layer formed on the first surface of the substrate layer; A plurality of first conductive metal layers are formed in the third cured adhesive layer; the plurality of first conductive metal layers are arranged in an interval manner; a fourth cured adhesive layer, formed on a side of the third cured adhesive layer away from the substrate layer; A plurality of second conductive metal layers are formed in the fourth cured adhesive layer; the plurality of second conductive metal layers are arranged in an interval manner; The second optical adhesive layer is formed on a side of the fourth curing adhesive layer away from the third curing adhesive layer.

8. The touch film with a wide viewing angle according to claim 6 or 7, characterized in that: The thickness of the first conductive metal layer is less than the thickness of the third curing adhesive layer; The thickness of the second conductive metal layer is smaller than the thickness of the fourth curing adhesive layer.

9. The touch film with a wide viewing angle according to claim 6 or 7, characterized in that: The thickness of the third cured adhesive layer and the fourth cured adhesive layer are 6 μm to 40 μm respectively; The thickness of the first conductive metal layer and the second conductive metal layer are 1 μm to 20 μm respectively.

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