A pet optical composite film

Abstract

This utility model discloses a PET optical composite film, characterized by comprising an upper PET film, a middle PET film, and a lower PET film. The upper surface of the upper PET film has an upper diffuser particle layer, and the lower surface of the upper PET film has a chamfered first protrusion. The upper surface of the lower PET film has a chamfered second protrusion, and the lower surface of the lower PET film has a lower diffuser particle layer. Both the upper and lower surfaces of the middle PET film are coated with adhesive. The upper surface of the middle PET film is bonded to the first protrusion on the lower surface of the upper PET film, and the lower surface of the middle PET film is bonded to the second protrusion on the upper surface of the lower PET film. This utility model, through the chamfered protrusion structure at different angles, increases the viewing angle range in both the horizontal and vertical directions.

Description

Technical Field

[0001] This utility model relates to an optical film, specifically a PET optical composite film. Background Technology

[0002] The optical film industry has flourished due to the development of LCD panels. Optical composite films combine two or more optical functions onto a single film, achieving enhanced optical effects through the layering of multiple films with varying effects. Currently, capacitive touch display devices are the most mainstream, operating by sensing the electrical current of the human body. However, for touch screens, due to the direct-lit point light source structure of the backlight module, the backlight source is emitted outward at an angle close to perpendicular to the screen, resulting in a narrow viewing angle. This causes the brightness of the display to gradually decrease until it becomes unreadable along the direction deviating from the central axis. Therefore, the content displayed on the screen can only be clearly seen when directly facing the display device; when positioned to the sides of the screen, users often find it difficult to see the image and content clearly. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a PET optical composite film that increases the viewing angle range.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A PET optical composite film includes an upper PET film, a middle PET film, and a lower PET film. An upper diffuser particle layer is formed on the upper surface of the upper PET film, and a first protrusion with chamfered edges is provided on the lower surface of the upper PET film. A second protrusion with chamfered edges is provided on the upper surface of the lower PET film, and a lower diffuser particle layer is formed on the lower surface of the lower PET film. Both the upper and lower surfaces of the middle PET film are coated with adhesive. The upper surface of the middle PET film is bonded to the first protrusion on the lower surface of the upper PET film, and the lower surface of the middle PET film is bonded to the second protrusion on the upper surface of the lower PET film.

[0006] As a further improvement, the haze of the upper diffused particle layer of the upper PET film is 60%-70%, and the haze of the lower diffused particle layer of the lower PET film is 3%-10%.

[0007] As a further improvement, the upper PET film has a plurality of first protrusions, and the interval between two adjacent first protrusions is 45-50 micrometers, the height of the first protrusion is 50-60 micrometers, and the angle of the first protrusion is 45-50 degrees.

[0008] As a further improvement, the lower PET film has several second protrusions, and the spacing between two adjacent second protrusions is 60-70 micrometers, the height of the second protrusion is 30-40 micrometers, and the angle of the second protrusion is 85-95 degrees.

[0009] As a further improvement, the middle PET film is a transparent film material.

[0010] As a further improvement, the thickness of the upper and lower diffused particle layers is 10-20 micrometers.

[0011] As a further improvement, the thickness of the upper PET film and the middle PET film is 100-150 micrometers, and the thickness of the lower PET film is 180-200 micrometers.

[0012] As a further improvement, the first and second protrusions are formed by embossing.

[0013] This utility model has the following beneficial technical effects:

[0014] By using a three-layer composite structure, and by setting angular protrusions of different angles in the upper and lower layers, the viewing angle range in both the horizontal and vertical directions is increased, thereby expanding the viewing angle. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0016] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0019] like Figure 1 As shown, a PET optical composite film includes an upper PET film 2, a middle PET film 4, and a lower PET film 6. An upper diffuser particle layer 1 is formed on the upper surface of the upper PET film 2, and a chamfered first protrusion 3 is provided on the lower surface of the upper PET film 2. A chamfered second protrusion 5 is provided on the upper surface of the lower PET film 6, and a lower diffuser particle layer 7 is formed on the lower surface of the lower PET film 6. Both the upper and lower surfaces of the middle PET film 4 are coated with adhesive. The upper surface of the middle PET film is bonded to the first protrusion on the lower surface of the upper PET film, and the lower surface of the middle PET film is bonded to the second protrusion on the upper surface of the lower PET film. The chamfered first protrusion of the upper PET film expands the vertical viewing angle, while the second protrusion of the lower PET film, with an angle different from the first protrusion, expands the horizontal viewing angle.

[0020] The haze of the upper diffuser particle layer of the upper PET film is 60%-70%, and the haze of the lower diffuser particle layer of the lower PET film is 3%-10%. By improving the uniformity of light through the diffuser particle layer, and combined with the changes in the two protruding structures, the light refraction is changed, altering the direction of light emission and shifting it towards the edge of the touch screen, thereby expanding the viewing angle of the touch screen.

[0021] The upper PET film has several first protrusions, with a spacing of 45-50 micrometers between adjacent first protrusions, a height of 50-60 micrometers, and an angle of 45-50 degrees for each first protrusion. The lower PET film has several second protrusions, with a spacing of 60-70 micrometers between adjacent second protrusions, a height of 30-40 micrometers, and an angle of 85-95 degrees for each second protrusion.

[0022] By setting different angles, the horizontal and vertical viewing angles can be expanded, causing changes in the refractive index of light.

[0023] The middle PET film is a transparent film material that serves to bond the upper and lower layers.

[0024] The thickness of the upper and lower diffused particle layers is 10-20 micrometers. The thickness of the upper and middle PET films is 100-150 micrometers, and the thickness of the lower PET film is 180-200 micrometers. The overall thickness of the composite film after assembly is 500-550 micrometers.

[0025] The first and second protrusions are formed by embossing, with the first protrusion being embossed to form a chamfered structure. The specific number of the first and second protrusions needs to be calculated and designed according to the size of the touchscreen and the required viewing angle.

[0026] It should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PET optical composite film, characterized in that, It includes an upper PET film, a middle PET film, and a lower PET film. The upper surface of the upper PET film has an upper diffused particle layer, and the lower surface of the upper PET film has a chamfered first protrusion. The upper surface of the lower PET film has a chamfered second protrusion, and the lower surface of the lower PET film has a lower diffused particle layer. The upper and lower surfaces of the middle PET film are coated with adhesive. The upper surface of the middle PET film is bonded to the first protrusion on the lower surface of the upper PET film, and the lower surface of the middle PET film is bonded to the second protrusion on the upper surface of the lower PET film.

2. The PET optical composite film according to claim 1, characterized in that, The haze of the upper diffused particle layer of the upper PET film is 60%-70%, and the haze of the lower diffused particle layer of the lower PET film is 3%-10%.

3. The PET optical composite film according to claim 2, characterized in that, The upper PET film has several first protrusions, and the interval between two adjacent first protrusions is 45-50 micrometers, the height of the first protrusion is 50-60 micrometers, and the angle of the first protrusion is 45-50 degrees.

4. The PET optical composite film according to claim 1, characterized in that, The lower PET film has several second protrusions, and the distance between two adjacent second protrusions is 60-70 micrometers, the height of the second protrusion is 30-40 micrometers, and the angle of the second protrusion is 85-95 degrees.

5. The PET optical composite film according to claim 1, characterized in that, The middle PET film is a transparent film material.

6. The PET optical composite film according to claim 1, characterized in that, The thickness of the upper and lower diffused particle layers is 10-20 micrometers.

7. The PET optical composite film according to claim 1, characterized in that, The thickness of the upper and middle PET films is 100-150 micrometers, and the thickness of the lower PET film is 180-200 micrometers.

8. The PET optical composite film according to claim 1, characterized in that, The first and second protrusions are formed by embossing.

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