Touch screen with wide-spectrum antireflection and ultraviolet filtering functions and glass cover plate of touch screen

Abstract

The utility model discloses a glass cover plate with wide-spectrum antireflection and ultraviolet filtering functions, which comprises plate glass, a glass cover plate, a first light source, a second light source and a third light source, the antireflection film layer is arranged on the first surface of the plate glass; and the ultraviolet filtering film layer is arranged on the second surface of the plate glass. The glass cover plate has the functions of broadband spectrum antireflection and ultraviolet filtering at the same time. The utility model further discloses a touch screen with the wide-spectrum antireflection function and the ultraviolet filtering function. The touch screen comprises the glass cover plate with the wide-spectrum antireflection function and the ultraviolet filtering function.

Description

Technical Field

[0001] This utility model relates to touch screen technology, and more particularly to a touch screen and its glass cover. Background Technology

[0002] With the rapid development of technology, touchscreen technology has been widely applied in smartphones, tablets, smart home appliances, and industrial control, among other fields. As a core component of human-computer interaction, the performance of the touchscreen directly affects user satisfaction. The glass cover of the touchscreen, as a key component that directly contacts the user and protects the screen, is of paramount importance in its design and function. The glass cover not only protects the screen from physical impacts and scratches but also needs to possess excellent optical properties to optimize display effects.

[0003] However, most existing glass covers are made of flat glass. The smooth surface of the glass causes some of the incident sunlight to be reflected, especially outdoors in sunlight. A large amount of reflected light reduces the visibility of the glass cover, making it difficult for users to see the screen content behind the touchscreen. In addition, ultraviolet rays in sunlight can accelerate the aging and yellowing of the OCA optical adhesive and PET film in the touchscreen. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a glass cover that simultaneously possesses broadband anti-reflection and ultraviolet filtering functions.

[0005] A touch screen, including the aforementioned glass cover.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0007] A glass cover plate that combines broadband antireflection and ultraviolet filtering functions includes:

[0008] Flat glass, having opposing first and second surfaces;

[0009] An anti-reflective coating is disposed on the first surface of the flat glass;

[0010] An ultraviolet filter film layer is disposed on the second surface of the flat glass.

[0011] Furthermore, the ultraviolet filter layer is a nano-titanium dioxide film layer or a nano-zinc oxide film layer, with a thickness between 20-80 nm.

[0012] Furthermore, the antireflective coating layer includes a plurality of high refractive index coating layers and a plurality of low refractive index coating layers, which are alternately arranged sequentially on the first surface of the flat glass.

[0013] Furthermore, the high refractive index film is a niobium pentoxide film with a thickness between 40-60 nm.

[0014] Furthermore, the low refractive index film is a silicon dioxide film with a thickness between 10-120 nm.

[0015] Furthermore, in the antireflective coating layer, the layer facing the flat glass is the silicon dioxide coating layer.

[0016] Furthermore, the glass cover has a display area and a frame area, the frame area surrounding the periphery of the display area; the glass cover also includes a black rigid film layer, the black rigid film layer being disposed on the surface of the ultraviolet filter layer facing away from the flat glass, and covering only the frame area while avoiding the display area.

[0017] Furthermore, the black hard film layer is a boron carbide film layer with a thickness of 100-150 nm.

[0018] A touch screen with both broadband anti-reflection and ultraviolet filtering functions, comprising a touch film, OCA optical adhesive, and the aforementioned glass cover plate with both broadband anti-reflection and ultraviolet filtering functions, wherein the touch film is adhered and fixed to one side of the glass cover plate by OCA optical adhesive.

[0019] Furthermore, the touch film includes a PET film and a touch electrode layer, wherein the touch electrode layer is disposed on the surface of the PET film near the glass cover.

[0020] This invention has the following beneficial effects: The anti-reflective film layer is disposed on the first surface of the flat glass as the outer surface of the glass cover, and the ultraviolet filter layer is disposed on the second surface of the flat glass as the inner surface of the glass cover. The anti-reflective film layer can reduce the reflectivity of visible light in the glass cover to avoid generating a large amount of reflected light under outdoor sunlight, thus maintaining the visibility of the glass cover. The ultraviolet filter layer can reduce the transmittance of ultraviolet light in the glass cover to prevent the OCA optical adhesive and PET film in the touch screen from aging and yellowing due to long-term exposure to ultraviolet light. Attached Figure Description

[0021] Figure 1 A schematic diagram of the stacked structure of the glass cover plate provided by this utility model.

[0022] Figure 2 This is a schematic diagram of the stacked structure of the antireflective film layer in the glass cover provided by this utility model.

[0023] Figure 3A schematic diagram of the front structure of the glass cover plate provided by this utility model.

[0024] Figure 4 A schematic diagram of the stacking structure of another glass cover plate provided by this utility model.

[0025] Figure 5 A schematic diagram of the stacked structure of the touch screen provided by this utility model. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1

[0031] like Figure 1As shown, a glass cover plate with both broadband antireflection and ultraviolet filtering functions includes:

[0032] Flat glass 31 has opposing first and second surfaces;

[0033] An anti-reflective coating 32 is disposed on the first surface of the flat glass 31;

[0034] An ultraviolet filter film layer 33 is disposed on the second surface of the flat glass 31.

[0035] This invention provides an anti-reflective film layer 32 on the first surface of the flat glass 31 as the outer surface of the glass cover, and an ultraviolet filter layer 33 on the second surface of the flat glass 31 as the inner surface of the glass cover. The anti-reflective film layer 32 can reduce the reflectivity of visible light in the glass cover to avoid generating a large amount of reflected light under outdoor sunlight and maintain the visibility of the glass cover. The ultraviolet filter layer 33 can reduce the transmittance of ultraviolet light in the glass cover to prevent the OCA optical adhesive and PET film in the touch screen from aging and yellowing due to long-term exposure to ultraviolet light.

[0036] In this embodiment, the ultraviolet filter film 33 is a nano-titanium dioxide film or a nano-zinc oxide film, with a thickness between 20-80nm. It can be formed on the first surface of the flat glass 31 by magnetron sputtering, vacuum evaporation, vapor deposition, or other methods.

[0037] The nano-titanium dioxide film exhibits strong absorption of ultraviolet (UV) light, particularly anatase nano-titanium dioxide, which has a band gap of 3.2 eV and can absorb UV light with wavelengths less than 387 nm. The UV blocking mechanism of the nano-titanium dioxide film is closely related to its particle size. Because the size of the nano-titanium dioxide particles is much smaller than the wavelength of UV or visible light, when UV light irradiates the film, the electrons of the nano-titanium dioxide particles are forced to vibrate, becoming secondary wave sources and scattering the UV light. When the particle size is large, UV blocking is mainly achieved through reflection and scattering, and is effective for both mid-wave and long-wave UV light. However, as the particle size decreases, light can pass through the surface of the nano-titanium dioxide particles. The reflection and scattering of long-wave UV light are not significant, while the absorption of mid-wave UV light is significantly enhanced. Therefore, the nano-titanium dioxide film can both reflect and scatter UV light, and also absorb UV light, thus exhibiting strong blocking capabilities for UV light of different wavelengths.

[0038] The nano-zinc oxide film exhibits strong ultraviolet (UV) absorption capabilities. Its crystalline structure absorbs UV energy and converts it into heat, effectively blocking UV penetration. The smaller the particle size of the nano-zinc oxide film, the larger its specific surface area, resulting in more significant UV absorption. Furthermore, the nano-zinc oxide film also scatters UV light. Because the size of the nano-zinc oxide particles is much smaller than the wavelength of UV light, multiple reflections and scattering occur when UV light strikes the film. The glassy layer on the surface of the nano-zinc oxide film effectively reflects UV light; when UV light strikes the film surface, some of it is reflected back, reducing the amount of UV radiation and minimizing skin damage. This combined reflection and scattering effect makes the nano-zinc oxide film excellent in UV protection.

[0039] like Figure 2 As shown, the antireflective coating 32 includes a plurality of high refractive index coatings 321 and a plurality of low refractive index coatings 322, which are alternately arranged on the first surface of the flat glass 31.

[0040] The antireflection film 32 reduces reflected light based on the principle of light coherence. Due to the large difference in refractive index between the high refractive index film 321 and the low refractive index film 322, visible light is reflected when it passes through the interface between the high refractive index film 321 and the low refractive index film 322 because the refractive index increases. By reasonably designing the thickness of each layer of the high refractive index film 321 and the low refractive index film 322, the optical path difference between two adjacent reflected beams can reach one-quarter of the wavelength of visible light to meet the optical interference condition, thereby causing the two reflected beams to interfere with each other and cancel each other out.

[0041] The total number of antireflective coating layers 32, including high-refractive-index layer 321 and low-refractive-index layer 322, is generally 4-10 layers, depending on the specific refractive index of the material.

[0042] In this embodiment, the high refractive index film 321 is a niobium pentoxide film with a thickness between 40-60 nm, and the low refractive index film 322 is a silicon dioxide film with a thickness between 10-120 nm. The niobium pentoxide film and the silicon dioxide film can be sequentially formed on the second surface of the flat glass 31 by means of magnetron sputtering, vacuum evaporation, vapor deposition, etc.

[0043] Preferably, in the antireflective coating layer 32, the layer facing the flat glass 31 is the silicon dioxide coating layer.

[0044] Compared to the niobium pentoxide film, the molecular structure of the silicon dioxide film is similar to that of the flat glass 31. The bonding force between the silicon dioxide film and the flat glass 31 is much greater than that between the niobium pentoxide film and the flat glass 31. By using the silicon dioxide film as the side of the antireflective film 32 facing the flat glass 31, the adhesion of the antireflective film 32 to the flat glass 31 can be improved, thus enhancing the stability of the antireflective film 32.

[0045] In this embodiment, the antireflective coating 32 includes a first silicon dioxide film layer 322a, a first niobium pentoxide film layer 321a, a second silicon dioxide film layer 322b, a second niobium pentoxide film layer 321b, a third silicon dioxide film layer 322c, a second niobium pentoxide film layer 321b, and a fourth silicon dioxide film layer 322d, which are sequentially disposed on the second surface of the flat glass 31. The thicknesses of the first silicon dioxide film layer 322a, the first niobium pentoxide film layer 321a, the second silicon dioxide film layer 322b, the second niobium pentoxide film layer 321b, the third silicon dioxide film layer 322c, the third niobium pentoxide film layer 321c, and the fourth silicon dioxide film layer 322d are 10-30nm, 5-20nm, 10-30nm, 30-60nm, 5-20nm, 20-40nm, and 80-120nm, respectively.

[0046] Example 2

[0047] As an optimization of Embodiment 1, in this embodiment, such as Figure 3 and 4 As shown, the glass cover has a display area 301 and a frame area 302, the frame area 302 surrounding the periphery of the display area 301; the glass cover also includes a black hard film layer 34, the black hard film layer 34 being disposed on the surface of the ultraviolet filter film layer 33 on the side facing away from the flat glass 31, and only covering the frame area 302 while avoiding the display area 301.

[0048] This invention places the black hard film layer 34 on the inner surface of the ultraviolet filter film layer 33 and covers the frame area 302 of the glass cover plate, replacing the BM black ink in the prior art, to form the black frame of the glass cover plate. This can prevent the black frame of the glass cover plate from being scratched during transportation, transfer and assembly, and thus ensure the adhesion stability between the black frame of the glass cover plate (i.e., the black hard film layer 34) and the machine casing during the assembly of the whole machine.

[0049] In this embodiment, the black hard film layer 34 is a boron carbide film layer with a thickness of 100-150 nm.

[0050] The boron carbide film is a black, glossy crystalline film formed from boron carbide (chemical formula B4C) using methods such as vacuum deposition, chemical vapor deposition (CVD), or sol-gel methods. Its Mohs hardness is approximately 9.3 to 9.5, second only to diamond and cubic boron nitride, making it one of the three hardest known materials. Furthermore, the boron carbide film is chemically stable, does not react with most acid and alkali solutions, and is resistant to high temperatures.

[0051] Example 3

[0052] like Figure 5 As shown, a touch screen with both broadband anti-reflection and ultraviolet filtering functions is provided, comprising a touch film 1, an OCA optical adhesive 2, and a glass cover plate 3 with both broadband anti-reflection and ultraviolet filtering functions as described in Embodiment 1 or Embodiment 2. The touch film 1 is adhered and fixed to the surface of the glass cover plate 3 on the side with the ultraviolet filter film layer 33 by the OCA optical adhesive 2.

[0053] The touch screen of this utility model blocks ultraviolet light from the external environment by setting the ultraviolet filter film layer 33 in the glass cover plate 3, thereby avoiding the aging and yellowing of the OCA optical adhesive 2 due to long-term exposure to ultraviolet light.

[0054] The touch film 1 includes a PET film 11 and a touch electrode layer 12, wherein the touch electrode layer 12 is disposed on the surface of the PET film 11 near the glass cover plate 3.

[0055] The touch screen of this utility model blocks ultraviolet light from the external environment by setting the ultraviolet filter film layer 33 in the glass cover plate 3, thereby avoiding the aging and yellowing of the PET film 11 due to long-term exposure to ultraviolet light.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present utility model, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present utility model.

Claims

1. A glass cover plate that combines broadband antireflection and ultraviolet filtering functions, characterized in that, include: Flat glass, having opposing first and second surfaces; An anti-reflective coating is disposed on the first surface of the flat glass; An ultraviolet filter film layer is disposed on the second surface of the flat glass; The glass cover has a display area and a frame area, with the frame area surrounding the periphery of the display area; the glass cover also includes a black hard film layer, which is disposed on the surface of the ultraviolet filter layer on the side facing away from the flat glass, and only covers the frame area while avoiding the display area; the black hard film layer is a boron carbide film layer with a thickness of 100-150nm.

2. The glass cover plate according to claim 1, characterized in that, The ultraviolet filter layer is a nano-titanium dioxide film or a nano-zinc oxide film, with a thickness between 20-80 nm.

3. The glass cover plate according to claim 1, characterized in that, The antireflective coating includes several high-refractive-index coatings and several low-refractive-index coatings, which are alternately arranged sequentially on the first surface of the flat glass.

4. The glass cover plate according to claim 3, characterized in that, The high refractive index film is a niobium pentoxide film with a thickness between 40-60 nm.

5. The glass cover plate according to claim 3, characterized in that, The low-refractive-index film is a silicon dioxide film with a thickness between 10-120 nm.

6. The glass cover plate according to claim 5, characterized in that, In the antireflective coating layer, the layer facing the flat glass is the silicon dioxide coating layer.

7. A touch screen that combines broadband anti-reflection and ultraviolet filtering functions, characterized in that, The touch film, OCA optical adhesive, and the glass cover plate with both broadband anti-reflection and ultraviolet filtering functions as described in claim 1 are provided, wherein the touch film is adhered and fixed to the surface of the glass cover plate on the side having the ultraviolet filtering film layer by OCA optical adhesive.

8. The touch screen according to claim 7, characterized in that, The touch film includes a PET film and a touch electrode layer, wherein the touch electrode layer is disposed on the surface of the PET film near the glass cover.

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