Integrated touch screen with shielding function

Abstract

The utility model discloses an integrated touch screen with a shielding function, which comprises a glass substrate, an optical adhesive layer, a liquid crystal display module and a shielding layer, the shielding layer is arranged between the glass substrate and the liquid crystal display module, and the shielding layer is a composite shielding layer compounded by an ITO (indium tin oxide) film layer and a metal grid shielding layer. The composite shielding layer comprises a glass plate, an ITO film layer and a metal grid shielding layer, and the metal grid shielding layer is located between the glass plate and the ITO film layer. And the metal grid shielding layer comprises bottom molybdenum, top molybdenum and middle layer aluminum located in the middle. The ITO and the metal grid shielding layer located in the middle layer have a synergistic effect, the electromagnetic shielding effectiveness (SE is larger than or equal to 50 dB and 1 GHz) is enhanced, high-frequency interference is restrained, high light transmittance and low square resistance are ensured, cost is low, and the yield is high.

Description

Technical Field

[0001] This utility model relates to the field of touch screen technology, and in particular to an integrated touch screen with shielding function. Background Technology

[0002] In traditional CTP products, the touch sensor typically has a single layer of ITO (indium tin oxide) film deposited on the non-patterned side (B-side) of the glass substrate to shield against electromagnetic interference between the LCM (liquid crystal display module) and the sensor. However, OGS (One Glass Solution) structures, which integrate touch and cover glass functions on a single piece of glass, cannot have an independent film deposited on the B-side, resulting in insufficient shielding effectiveness, especially susceptible to interference in complex electromagnetic environments. Furthermore, fabricating a metal mesh on the B-side of existing external TPSens requires additional processing steps, leading to high costs and difficulty in controlling yield. Therefore, a novel shielding layer solution that balances shielding effectiveness, optical transmittance, and process feasibility is urgently needed.

[0003] Existing touch structure solutions have the following problems: 1. Traditional OGS structures lack an effective electromagnetic shielding layer and are susceptible to signal interference between LCM and Sensor; 2. The shielding effectiveness of a single ITO film layer is low and it is difficult to meet the requirements of high frequency or complex electromagnetic environments; 3. Existing Metal mesh technology is difficult to implement on the B-side, resulting in high cost and low yield.

[0004] For example, patent CN118689346A discloses a lightweight, electromagnetic interference-resistant capacitive touchscreen, which includes a protective glass layer to protect the internal layers; a first transparent conductive film, which is bonded to the protective glass layer with optical adhesive and has an ITO layer deposited on its surface; a second transparent conductive film, which is bonded to the first transparent conductive film with optical adhesive and has an ITO layer deposited on its surface; a PET layer, to which the second transparent conductive film is bonded with optical adhesive; a metal mesh film, to which an adhesive backing is bonded and connected to the PET layer; and an external structure, which requires additional processing steps, resulting in high costs and difficulty in controlling yield. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an integrated touch screen with shielding function, which has good shielding effectiveness, low cost, and high yield.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] The integrated touch screen with shielding function includes a glass substrate, an optical adhesive layer, a liquid crystal display module, and a shielding layer. The shielding layer is disposed between the glass substrate and the liquid crystal display module, and the shielding layer is a composite shielding layer composed of an ITO film layer and a metal mesh shielding layer.

[0008] Further or preferred:

[0009] The optical adhesive layer includes a first optical adhesive layer and a second optical adhesive layer, and the composite shielding layer is located between the first optical adhesive layer and the second optical adhesive layer.

[0010] The composite shielding layer includes a glass plate, an ITO film layer, and a metal mesh shielding layer, with the metal mesh shielding layer located between the glass plate and the ITO film layer.

[0011] The metal mesh shielding layer comprises a bottom molybdenum layer, a top molybdenum layer, and an intermediate aluminum layer.

[0012] The linewidth of the metal mesh shielding layer is ≤13.5μm, and the aperture ratio is ≥85%.

[0013] The top layer of molybdenum is a blackened molybdenum layer.

[0014] The thickness of the ITO film ranges from 18 to 26 nm, and the transmittance is ≥70%.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This integrated touchscreen with shielding function is reasonably designed. The ITO and the metal mesh shielding layer in the middle layer work together to enhance the electromagnetic shielding effectiveness (SE≥50dB@1GHz), suppress high-frequency interference, ensure high light transmittance and low sheet resistance, as well as low cost and high yield. Attached Figure Description

[0017] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0018] Figure 1 This is a schematic diagram of the touch screen layer structure of this utility model. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0020] like Figure 1 As shown, the integrated touch screen with shielding function includes a glass substrate, an optical adhesive layer, a liquid crystal display module, and a shielding layer; the shielding layer is disposed between the glass substrate and the liquid crystal display module, and the shielding layer is a composite shielding layer composed of an ITO film layer and a metal mesh shielding layer.

[0021] The optical adhesive layer includes a first optical adhesive layer and a second optical adhesive layer, and a composite shielding layer is located between the first optical adhesive layer and the second optical adhesive layer, forming an integrated touch screen structure with the shielding layer located in the middle layer.

[0022] The composite shielding layer includes a glass plate, an ITO film layer, and a metal mesh shielding layer, with the metal mesh shielding layer located between the glass plate and the ITO film layer; preferably, the metal mesh shielding layer includes a bottom molybdenum layer, a top molybdenum layer, and an intermediate aluminum layer located in the middle.

[0023] Furthermore, the metal mesh shielding layer has a linewidth ≤13.5μm and an aperture ratio ≥85%. The top molybdenum layer is a blackened molybdenum layer. The ITO film layer has a thickness ranging from 18-26nm and a transmittance ≥70%.

[0024] This utility model features a well-designed integrated touchscreen with shielding function. The ITO and the metal mesh shielding layer in the middle layer work together to enhance electromagnetic shielding effectiveness (SE≥50dB@1GHz), suppress high-frequency interference, ensure high light transmittance and low sheet resistance, as well as low cost and high yield.

[0025] The preferred specific example of this utility model patent is as follows:

[0026] This integrated touchscreen with shielding function includes the following core features:

[0027] Layered structure: From the touch surface to the LCM (Liquid Crystal Module), the layers are as follows:

[0028] OGS TP cover plate (glass substrate); (thickness: 0.55mm)

[0029] First OCA optical adhesive layer; (500μm) (Material: optical acrylic adhesive (or acrylic optical adhesive))

[0030] Shielding layer (650nm): It is composed of an ITO film layer and a Metal mesh layer (metal mesh shielding layer) stacked vertically. The ITO film layer is 20nm thick, and the Metal mesh adopts a MO-AL-MO (molybdenum-aluminum-molybdenum) structure with a linewidth ≤13.5μm and an aperture ratio ≥85%.

[0031] Second OCA optical adhesive layer; (500μm)

[0032] LCM module (8.1mm).

[0033] Its functions work together:

[0034] ITO layer: Provides basic conductivity and optical transmittance (≥70%);

[0035] Metal mesh layer: Enhances electromagnetic shielding effectiveness (SE≥50dB@1GHz) and suppresses high-frequency interference through a mesh structure (the mesh material is molybdenum-aluminum-molybdenum structure, located in the shielding layer);

[0036] The combined sheet resistance is ≤0.5Ω / □.

[0037] Process optimization: The Metal mesh layer is made separately on the shielding layer, and the MO layer on the human-machine surface is blackened to make the Metal less noticeable in the dark state of the display module.

[0038] The present invention has the following advantages: the electromagnetic shielding performance is improved by more than 150% compared with single-layer ITO, and it is suitable for complex scenarios such as 5G, industry, and medical. ITO and Metal mesh work together to ensure high light transmittance and low sheet resistance. The OGS structure integrates Metal mesh technology, which reduces costs by 20%-30% and increases yield by 15%-30%.

[0039] The above description is only a preferred embodiment of the present utility model. The above technical features can be arbitrarily combined to form multiple embodiments of the present utility model.

[0040] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An integrated touchscreen with shielding function, comprising a glass substrate, an optical adhesive layer, a liquid crystal display module, and a shielding layer, characterized in that: The shielding layer is disposed between the glass substrate and the liquid crystal display module, and the shielding layer is a composite shielding layer composed of an ITO film layer and a metal mesh shielding layer.

2. The integrated touchscreen with shielding function as described in claim 1, characterized in that: The optical adhesive layer includes a first optical adhesive layer and a second optical adhesive layer, and the composite shielding layer is located between the first optical adhesive layer and the second optical adhesive layer.

3. The integrated touchscreen with shielding function as described in claim 1, characterized in that: The composite shielding layer includes a glass plate, an ITO film layer, and a metal mesh shielding layer, with the metal mesh shielding layer located between the glass plate and the ITO film layer.

4. The integrated touchscreen with shielding function as described in claim 3, characterized in that: The metal mesh shielding layer comprises a bottom molybdenum layer, a top molybdenum layer, and an intermediate aluminum layer.

5. The integrated touchscreen with shielding function as described in claim 4, characterized in that: The linewidth of the metal mesh shielding layer is ≤13.5μm, and the aperture ratio is ≥85%.

6. The integrated touchscreen with shielding function as described in claim 4, characterized in that: The top layer of molybdenum is a blackened molybdenum layer.

7. The integrated touchscreen with shielding function as described in claim 4, characterized in that: The thickness of the ITO film ranges from 18 to 26 nm, and the transmittance is ≥70%.

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