High-reliability DITO touch screen structure

Abstract

The utility model discloses a high-reliability DITO touch screen structure which comprises a DITO glass layer, the DITO glass layer comprises a glass substrate, a first ITO layer and a second ITO layer, and the first ITO layer and the second ITO layer are arranged on the surfaces of the two sides of the glass substrate respectively. The DITO touch screen structure further comprises a first tempered glass layer and a first adhesive layer, wherein the first tempered glass layer is attached and fixed to the surface of the side, provided with the first ITO layer, of the DITO glass layer through the first adhesive layer; the second tempered glass layer is attached and fixed to the surface of the side, provided with the second ITO layer, of the DITO glass layer through the second adhesive layer. The DITO touch screen structure disclosed by the utility model has relatively high reliability.

Description

Technical Field

[0001] The utility model relates to a touch screen technology, in particular to a DITO touch screen structure with high reliability. Background Art

[0002] DITO (Double Indium Tin Oxide) touch screen is a capacitive touch screen technology that uses two layers of indium tin oxide (ITO) material to achieve touch function. Compared with single-layer ITO (SITO) touch screen, DITO touch screen can provide more complex pattern design due to the double-layer ITO electrode, thereby improving the accuracy and reliability of touch.

[0003] However, since the DITO touch screen has ITO electrodes on both sides of the glass substrate, the ITO electrodes on the back are exposed for a long time and are easily oxidized by water vapor in the air during long-term use, causing the touch function to fail. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a DITO touch screen structure with higher reliability.

[0005] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0006] A high-reliability DITO touch screen structure includes a DITO glass layer, wherein the DITO glass layer includes a glass substrate and a first ITO layer and a second ITO layer respectively arranged on both side surfaces of the glass substrate; the DITO touch screen structure also includes:

[0007] A first tempered glass layer and a first adhesive layer, wherein the first tempered glass layer is bonded and fixed to a surface of the DITO glass layer having the first ITO layer through the first adhesive layer;

[0008] A second tempered glass layer and a second adhesive layer, wherein the second tempered glass layer is bonded and fixed to a surface of the DITO glass layer on one side having the second ITO layer through the second adhesive layer.

[0009] Furthermore, the first adhesive layer is OCA optical adhesive.

[0010] Furthermore, the second adhesive layer is a PVB adhesive film.

[0011] Furthermore, a first metal trace is provided on the surface of the first ITO layer facing the first tempered glass layer, and the first metal trace covers the non-display area of ​​the first ITO layer; a second metal trace is provided on the surface of the second ITO layer facing the second tempered glass layer, and the second metal trace covers the non-display area of ​​the second ITO layer.

[0012] Furthermore, at least one of the first metal wiring and the second metal wiring is a silver paste wiring.

[0013] Furthermore, a first insulating oil is disposed on a surface of the first metal trace facing the first tempered glass layer, and a second insulating oil is disposed on a surface of the second metal trace facing the second tempered glass layer.

[0014] Furthermore, one of the first ITO layer and the second ITO layer is a touch signal transmitting layer, and the other of the first ITO layer and the second ITO layer is a touch signal receiving layer.

[0015] Furthermore, a light-shielding ink is provided on a surface of the first tempered glass layer facing the DITO glass layer, and the light-shielding ink covers a non-display area of ​​the first tempered glass layer.

[0016] Furthermore, the light-shielding ink is black ink.

[0017] Furthermore, at least one of an anti-glare film, an anti-reflection film and an anti-fingerprint film is provided on a surface of the first tempered glass layer facing away from the DITO glass layer.

[0018] The utility model has the following beneficial effects: the DITO touch screen structure of the utility model fixes the second tempered glass layer on the back of the DITO glass layer, uses the second tempered glass layer to protect the second ITO layer on the back of the DITO glass layer, and seals the second ITO layer to isolate the second ITO layer from the air, thereby preventing the second ITO layer from being oxidized by water vapor in the air during long-term use and causing failure of the touch function, thereby greatly improving the functional reliability of the DITO glass layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front structural schematic diagram of the DITO touch screen structure provided by the utility model.

[0020] Figure 2 This is a schematic diagram of the stacking structure of the DITO touch screen structure provided by the utility model.

[0021] Figure 3This is a schematic diagram of the stacking structure of another DITO touch screen structure provided by the utility model. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent 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 are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] 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.

[0024] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] like Figure 2 As shown, a high-reliability DITO touch screen structure includes a DITO glass layer 30, wherein the DITO glass layer 30 includes a glass substrate 32 and a first ITO layer 31 and a second ITO layer 33 respectively disposed on both side surfaces of the glass substrate 32; the DITO touch screen structure also includes:

[0028] A first tempered glass layer 10 and a first adhesive layer 20, wherein the first tempered glass layer 10 is bonded and fixed to a surface of the DITO glass layer 30 having the first ITO layer 31 through the first adhesive layer 20;

[0029] The second tempered glass layer 50 and the second adhesive layer 40 , the second tempered glass layer 50 is bonded and fixed to the surface of the DITO glass layer 30 having the second ITO layer 33 through the second adhesive layer 40 .

[0030] The DITO touch screen structure of the utility model fixes the second tempered glass layer 50 on the back side of the DITO glass layer 30, and uses the second tempered glass layer 50 to protect the second ITO layer 33 on the back side of the DITO glass layer 30, and seals the second ITO layer 33 to isolate the second ITO layer 33 from the air, thereby preventing the second ITO layer 33 from being oxidized by water vapor in the air during long-term use and causing failure of the touch function, thereby greatly improving the functional reliability of the DITO glass layer 30.

[0031] Preferably, the first adhesive layer 20 is OCA optical adhesive.

[0032] The OCA optical adhesive, whose full name is Optically Clear Adhesive, is a special adhesive used to bond transparent optical components. It belongs to a type of pressure-sensitive adhesive and has the characteristics of colorless transparency, high light transmittance, and high adhesion. The OCA optical adhesive has high clarity and a total light transmittance of more than 99%, which ensures high light transmittance. The OCA optical adhesive has good bonding strength and can ensure a tight connection between optical components. The OCA optical adhesive has excellent weather resistance and water resistance, and will not cause yellowing, peeling, and deterioration problems after long-term use. The OCA optical adhesive can be cured at room temperature or medium temperature, and has small curing shrinkage, and is suitable for use at various ambient temperatures. The OCA optical adhesive can resist the erosion of ultraviolet rays and maintain long-term stability and reliability.

[0033] Preferably, the second adhesive layer 40 is a PVB adhesive film.

[0034] The PVB adhesive film has high transparency and will not affect the display effect of the touch screen. At the same time, the PVB adhesive film has strong adhesion to the second tempered glass layer 50. After the second tempered glass layer 50 is damaged, the fragments of the second tempered glass layer 50 can be firmly adhered and will not splash out, thereby playing a safety role. Specifically, due to the hydrogen bond between the SiOH group in the second tempered glass layer 50 and the COH group in the PVB adhesive film to form an adhesive force, the PVB adhesive film has better adhesion to the second tempered glass layer 50 than ordinary optical adhesives. By using the strong adhesion of the PVB adhesive film, not only the second tempered glass layer 50 will not have the problem of glass splashing after a collision.

[0035] like Figure 1 As shown, the DITO touch screen structure has a display area 100 and a non-display area 200, and the non-display area 200 surrounds the periphery of the display area 100, wherein the display area 100 and the non-display area 200 are also correspondingly provided on the first tempered glass layer 10, the DITO glass layer 30 and the first tempered glass layer 10.

[0036] like Figure 2 As shown, a first metal trace 311 is provided on a surface of the first ITO layer 31 facing the first tempered glass layer 10, and the first metal trace 311 covers the non-display area 200 of the first ITO layer 31; a second metal trace 331 is provided on a surface of the second ITO layer 33 facing the second tempered glass layer 50, and the second metal trace 331 covers the non-display area 200 of the second ITO layer 33.

[0037] After the first metal routing 311 and the second metal routing 331 are respectively stacked on the peripheral signal routing of the first ITO layer 31 and the second ITO layer 33, it is equivalent to increasing the cross-sectional area of ​​the peripheral signal routing, and can reduce the routing resistance of the first ITO layer 31 and the second ITO layer 33 on the non-display area 200, so as to improve the signal response speed of the first ITO layer 31 and the second ITO layer 33, and reduce the attenuation of the signal when it is transmitted in the routing.

[0038] Of course, the first ITO layer 31 and the second ITO layer 33 may not make the peripheral signal routing on the non-display area 200, but directly use the first metal routing 311 and the second metal routing 331 as the peripheral signal routing of the first ITO layer 31 and the second ITO layer 33 respectively, and connect to the edges of the first ITO layer 31 and the second ITO layer 33.

[0039] At least one of the first metal routing 311 and the second metal routing 331 is a silver paste routing, that is, the first metal routing 311 can be a first silver paste routing, and the second metal routing 331 can also be a second silver paste routing.

[0040] A first insulating oil 312 is disposed on a surface of the first metal trace 311 facing the first tempered glass layer 10 , and a second insulating oil 332 is disposed on a surface of the second metal trace 331 facing the second tempered glass layer 50 .

[0041] The first insulating oil 312 and the second insulating oil 332 mainly cover the surface of the first metal wiring 311 and the second metal wiring 331 to isolate the first metal wiring 311 and the second metal wiring 331, avoid the first metal wiring 311 and the second metal wiring 331 from short circuit with other devices, and also isolate the first metal wiring 311 and the second metal wiring 331 from oxidation corrosion by air; of course, the first insulating oil 312 and the second insulating oil 332 need to leave a certain area at the edge position to expose the local area of ​​the first metal wiring 311 and the second metal wiring 331 to be bound and connected with the flexible circuit board 300.

[0042] One of the first ITO layer 31 and the second ITO layer 33 is a touch signal transmitting layer, formed with a corresponding signal transmitting electrode pattern, and the other of the first ITO layer 31 and the second ITO layer 33 is a touch signal receiving layer, formed with a corresponding signal receiving electrode pattern.

[0043] A light shielding ink 11 is provided on a surface of the first tempered glass layer 10 facing the DITO glass layer 30 , and the light shielding ink 11 covers the non-display area 200 of the first tempered glass layer 10 .

[0044] The light-shielding ink 11 is used to shield the peripheral signal wirings of the first ITO layer 31 and the second ITO layer 33 and the first metal wirings 311 and the second metal wirings 331 , and at the same time define the display area 100 of the DITO touch screen structure.

[0045] The light-shielding ink 11 is preferably black ink, and its OD value (absorbance) should be guaranteed to be above 4 to meet the light-shielding effect. The thickness of the light-shielding ink 11 is between 1.5-1.9 μm, and the number of layers is at least two. If the light-shielding property of the material of the light-shielding ink 11 is low, the thickness of the light-shielding ink 11 can be appropriately increased. If the light-shielding property of the material of the light-shielding ink 11 is high, the thickness of the light-shielding ink 11 can be appropriately reduced, and it should not be limited to this.

[0046] The black ink uses carbon black as a colorant, which is doped and mixed in an ink base material and formed on the first tempered glass layer 10 through a silk screen printing process. It has the characteristics of high density, high viscosity, high hiding power, etc. It has good printability, can be printed on various substrates, and has good weather resistance and durability.

[0047] Embodiment 2

[0048] As an optimization solution of the first embodiment, in this embodiment, if Figure 3 As shown, at least one of an anti-glare film 12 , an anti-reflection film 13 and an anti-fingerprint film 14 is provided on a surface of the first tempered glass layer 10 facing away from the DITO glass layer 30 .

[0049] The anti-glare film 12 is a special surface treatment film, and its main function is to reduce the concentration of reflected light generated on the surface, thereby improving visual comfort and clarity of displayed content. The anti-glare film 12 scatters incident light, converts light that may produce strong specular reflection into diffuse reflection or weak reflection, effectively suppresses the glare caused by direct light and ambient light, and helps improve contrast and color saturation by reducing reflectivity. Even in a strong light environment, it can maintain the clarity and realism of the image and reduce eye fatigue.

[0050] The anti-reflection film 13 is an optical film used to reduce the reflection of light on the surface of the material. This film is usually applied to optical elements, such as eyeglass lenses, camera lenses, microscopes, etc., to reduce the reflection of light, increase the transmittance, and thus improve the visual clarity. The working principle of the anti-reflection film 13 is to add one or more layers of thin films with a specific thickness and refractive index to the surface of the material so that the reflected light waves interfere at the interface and cancel each other out, thereby achieving the purpose of reducing reflection. These films can be metal oxides, fluorides or other materials. The thickness of the anti-reflection film 13 is usually one-quarter of the wavelength of light, so that the reflected light waves can reverse their phase when returning to the air and destructively interfere with the incident light waves.

[0051] The anti-fingerprint film 14 is a special protective film, which is mainly designed to reduce the visibility of fingerprints and oil stains on touch screens or other surfaces. The design principle of the anti-fingerprint film 14 is to disperse the texture of fingerprints through special materials and processes, so that fingerprints are not easily displayed on the screen, thereby achieving an anti-fingerprint effect. The materials used in the anti-fingerprint film 14 may include organic fluorides, etc. These materials are deposited on the substrate through vacuum coating technology, giving the surface waterproof, oil-proof, scratch-proof, anti-fingerprint and anti-pollution properties. Some anti-fingerprint films 14 achieve the effect by applying a frosted particle layer on the surface of the protective film. The larger the frosted particles, the more obvious the anti-fingerprint effect, but the clarity may be reduced. Some anti-fingerprint films 14 use quantitative factor fingerprint decomposition technology to add oily decomposition factors to the surface of the protective film, so that fingerprints formed by oil stains and sweat can be quickly taken away by the air, reducing the scattering and blurring caused by fingerprints. With the development of technology, the fuzziness of the frosted particle layer can be reduced, maintaining a high transmittance and screen clarity. The anti-fingerprint film 14 is not only anti-fingerprint, but also has the characteristics of wear resistance, rainbow pattern prevention, and high light transmittance.

[0052] Optimally, the anti-glare film 12 , the anti-reflection film 13 and the anti-fingerprint film 14 are sequentially arranged on the surface of the first tempered glass layer 10 facing away from the DITO glass layer 30 .

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-reliability DITO touch screen structure, comprising a DITO glass layer, wherein the DITO glass layer comprises a glass substrate and a first ITO layer and a second ITO layer respectively disposed on both side surfaces of the glass substrate; characterized in that: The DITO touch screen structure also includes: A first tempered glass layer and a first adhesive layer, wherein the first tempered glass layer is bonded and fixed to a surface of the DITO glass layer having the first ITO layer through the first adhesive layer; A second tempered glass layer and a second adhesive layer, wherein the second tempered glass layer is bonded and fixed to a surface of the DITO glass layer on one side having the second ITO layer through the second adhesive layer.

2. The DITO touch screen structure according to claim 1, characterized in that: The first adhesive layer is OCA optical adhesive.

3. The DITO touch screen structure according to claim 1 or 2, characterized in that: The second adhesive layer is a PVB adhesive film.

4. The DITO touch screen structure according to claim 1, characterized in that: A first metal trace is provided on a surface of the first ITO layer facing the first tempered glass layer, and the first metal trace covers the non-display area of ​​the first ITO layer; a second metal trace is provided on a surface of the second ITO layer facing the second tempered glass layer, and the second metal trace covers the non-display area of ​​the second ITO layer.

5. The DITO touch screen structure according to claim 4, characterized in that: At least one of the first metal wiring and the second metal wiring is a silver paste wiring.

6. The DITO touch screen structure according to claim 4, characterized in that: A first insulating oil is disposed on a surface of the first metal trace facing the first tempered glass layer, and a second insulating oil is disposed on a surface of the second metal trace facing the second tempered glass layer.

7. The DITO touch screen structure according to claim 1, characterized in that: One of the first ITO layer and the second ITO layer is a touch signal transmitting layer, and the other of the first ITO layer and the second ITO layer is a touch signal receiving layer.

8. The DITO touch screen structure according to claim 1, characterized in that: A light-shielding ink is provided on a surface of the first tempered glass layer facing the DITO glass layer, and the light-shielding ink covers a non-display area of ​​the first tempered glass layer.

9. The DITO touch screen structure according to claim 8, characterized in that: The light-shielding ink is black ink.

10. The DITO touch screen structure according to claim 1, characterized in that: At least one of an anti-glare film, an anti-reflection film and an anti-fingerprint film is provided on a surface of the first tempered glass layer facing away from the DITO glass layer.

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