Touch screen without raised grains and manufacturing method thereof

Abstract

The invention relates to the technical field of touch screens, in particular to a wavy-grain-free touch screen and a manufacturing method thereof.The wavy-grain-free touch screen comprises a PET base material, an ITO layer arranged on the PET base material, a gluing layer wrapping the ITO layer and filling and leveling up gullies in the ITO layer, and a glass cover plate bonded with the gluing layer through an OCA colloid layer; according to the touch screen, the colorless, transparent and insulating liquid OCA glue forming the gluing layer is used for filling the gullies in the ITO layers in the touch screen, then the liquid OCA glue is fixed in the gullies in a UV curing mode, the gullies between the ITO layers are eliminated from the manufacturing source, deformation of the PET base material is avoided, and the touch screen without the gullies and the raised grains in the true sense is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screens, and in particular to a touch screen without wave patterns and a manufacturing method thereof. Background Art

[0002] With the development of touch screen technology, the intuitiveness and convenience of human-computer interaction interface are increasingly favored by consumers. The market demand for large-size touch screens has also increased sharply, and major touch screen manufacturers have also invested in the research and development of large-size touch screens. Traditional large-size touch screens use nano silver or metal grid technology, but the product transmittance and durability are relatively poor. At this stage, major manufacturers have also begun to develop and use high-transmittance, high-definition, high-stability and low-resistance ITO films to produce large-size touch screens.

[0003] There are grooves in ITO, which are essential for realizing the touch screen function and are used for effective isolation between channels. However, the substrate of the ITO film will be pulled by the OCA colloid squeezed into the grooves. Due to the softness of the ITO film, after the colloid is attached and pulled, the ITO film PET substrate at the grooves will be pulled and deformed. There is a very obvious visual contrast between the grooves and the ITO coating, that is, the wavy pattern phenomenon reported by the industry is serious. Figure 4 shown.

[0004] However, due to the high transmittance and high definition of the ITO film, the deformation of the PET substrate caused by clear ITO grooves can be seen on the surface of the manufactured touch screen, which is what the industry calls wavy lines. At present, the industry's approach to solving the wavy lines is mainly to perform surface wrinkling on the PET substrate of the ITO film, making the entire surface in a wavy form to reduce the resolution of the human eye and achieve the effect of invisible wavy lines. However, in fact, wavy lines still exist. Therefore, it is necessary to propose a touch screen that is truly groove-free and wavy-free. Summary of the invention

[0005] The object of the present invention is to provide a touch screen without wave patterns and a manufacturing method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In one aspect, a touch screen without wave patterns is provided, comprising:

[0008] An ITO film, wherein the ITO film comprises a PET substrate and an ITO layer disposed on the PET substrate;

[0009] A coating layer, wherein the coating layer wraps the ITO layer and fills the grooves in the ITO layer;

[0010] The glass cover plate and the adhesive layer are bonded together by an OCA adhesive layer.

[0011] Preferably, the thickness of the coating layer between the OCA colloid layer and the ITO layer is 0.05 mm.

[0012] Preferably, the material of the adhesive layer is colorless, transparent and insulating liquid OCA glue.

[0013] Preferably, the PET substrate is also provided with a wire connected to the ITO layer, an ACF arranged on the wire, and an FPC arranged on the ACF.

[0014] Preferably, waterproof glue is provided on the exposed portion of the wire that is not covered by the glue coating layer and the ACF, and the FPC and the PET substrate are connected by glue dispensing.

[0015] On the other hand, a method for preparing the above-mentioned ripple-free touch screen is also provided, comprising:

[0016] S1: performing an aging treatment on the ITO film, pressing a dry film onto the ITO film, exposing the dry film, performing development and etching to remove the film, and etching grooves in the ITO layer;

[0017] S2: printing silver paste on the ITO film, performing a second silver paste printing, and then baking;

[0018] S3: After laser engraving silver paste to form a wire connected to the ITO layer, the surface of the ITO film is cleaned;

[0019] S4: coating the surface of the ITO layer with liquid OCA glue, flattening it with a roller, and UV curing it to form the glue coating layer;

[0020] S5: laminating the adhesive layer and the OCA colloid layer and degassing;

[0021] S6: After laser cutting the sensor composed of the PET substrate, the ITO layer, the adhesive layer and the OCA colloid layer into a preset shape, the sensor is tested and cleaned;

[0022] S7: Perform ACF pre-pressing and FPC hot pressing in sequence, connect the FPC and the wire, apply waterproof glue and perform FOG test, adhere the glass cover plate and degas;

[0023] S8: Dispense glue on the glass cover plate, clean it, and perform a TP function test after attaching a protective film.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention comprises a PET substrate and an ITO layer arranged on the PET substrate. The grooves in the ITO layer in the touch screen are filled with colorless, transparent and insulating liquid OCA glue constituting the glue coating layer, and the liquid OCA glue is fixed in the grooves by UV curing, thereby eliminating the grooves between the ITO layers from the production source, avoiding deformation of the PET substrate, and realizing a touch screen without grooves and ripples in a true sense. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional structural schematic diagram of the present invention

[0027] Figure 2 It is a position relationship diagram of the ITO film, the adhesive layer, the glass cover plate and the OCA colloid layer of the present invention;

[0028] Figure 3 It is a schematic diagram of the working state of the present invention when pressing the adhesive coating layer;

[0029] Figure 4 This is the state diagram of the PET substrate being pulled by the OCA adhesive;

[0030] In the figure: 1. PET substrate; 2. ITO layer; 3. Glue coating layer; 4. Glass cover; 5. OCA colloid layer; 6. Glass substrate; 7. Roller; 8. Liquid OCA glue; 9. Wire; 10. ACF; 11. FPC; 12. Waterproof glue; 13. Glue dispensing. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figures 1 to 4 , the present invention provides a technical solution:

[0033] A touch screen without wave pattern, comprising:

[0034] ITO film, the ITO film includes a PET substrate and an ITO layer. An ITO layer 2 is arranged on the PET substrate 1. Grooves are opened in the ITO layer 2 to form an ITO pattern for realizing a touch function. The depth of the grooves is about 100 nm.

[0035] The coating layer 3 is coated on the ITO layer 2 to wrap the ITO layer 2 and fill the grooves in the ITO layer 2. The coating layer 3 is a colorless, transparent and insulating glue. The material of the glue is liquid OCA glue 8, the main component of which is acrylic adhesive. The thickness of the coating layer 3 between the OCA colloid layer 5 and the ITO layer 2 is 0.05 mm. The PET substrate 1 with the ITO layer 2 is fixedly set on the glass substrate 6, with the surface with the ITO layer 2 facing up, and then the liquid OCA glue 8 is evenly applied to the large PET substrate 1 with On the surface of the ITO layer 2, adjust the height and parallelism of the two rollers 7, align the glass substrate 6 with the gap between the two rollers 7, and slowly roll the rollers 7 from the left side of the glass substrate 6 to the right side of the glass substrate 6 to achieve high consistency of the glue coating. At the same time, the liquid OCA glue 8 can fill the ITO grooves. Finally, the PET substrate 1 coated with the liquid OCA glue 8 is pre-cured with the liquid OCA glue 8 through a UV oven with set parameters to prevent the liquid OCA glue 8 from flowing, resulting in uneven thickness of the glue layer 3 and affecting the appearance effect.

[0036] The glass cover plate 4 and the adhesive layer 3 are bonded together by an OCA adhesive layer 5 .

[0037] The PET substrate 1 is also provided with a wire 9 connected to the ITO layer 2, an ACF10 arranged on the wire 9, and an FPC11 arranged on the ACF10. The wire 9 is made of silver paste, so that one end of the wire 9 is connected to the ITO layer 2 and covered by the glue layer 3, and the other end extends out of the glue layer 3 and is connected to the ACF10, thereby connecting the FPC11 and the ITO layer 2.

[0038] A waterproof glue 12 is provided on the exposed portion of the wire 9 not covered by the adhesive layer 3 and the ACF 10 to prevent the wire 9 from being oxidized. The FPC 11 and the PET substrate 1 are connected by glue 13 to connect the FPC 11 and the PET substrate 1 to prevent the FPC 11 from being pulled and delaminated during the assembly process.

[0039] Preparation method: aging the PET substrate 1 to make the ITO arrangement more orderly and tight, pressing the dry film on the ITO film, exposing the dry film, developing and etching the film, removing the unnecessary ITO on the ITO film, making an ITO pattern to realize the touch function, that is, making ITO grooves to form an ITO layer 2, printing silver paste on the ITO film and then baking it after a second silver paste printing, laser engraving the silver paste to form a conductor 9, cleaning the surface of the ITO film, applying glue on the surface of the ITO layer 2, flattening it with a roller 7 and UV curing it to form a coating Glue layer 3, laser cut the sensor composed of PET substrate 1, ITO layer 2, glue coating layer 3 and OCA colloid layer 5 into a preset shape, then perform sensor test and clean. The preset shape can be reasonably set according to actual needs. Then, ACF10 pre-pressing and FPC11 hot pressing are performed in sequence, and FPC11 and wire 9 are connected. Waterproof glue 12 is applied on the wire 9 and FOG test is performed. The glass cover plate 4 is pasted and degassed. Glue 13 is applied on the glass cover plate 4 and cleaned. After the protective film is pasted on the glass cover plate 4, TP function test is performed.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A touch screen without ripples, characterized in that: include: An ITO film, wherein the ITO film comprises a PET substrate and an ITO layer disposed on the PET substrate; A coating layer, wherein the coating layer wraps the ITO layer and fills the grooves in the ITO layer; The glass cover plate and the adhesive layer are bonded together by an OCA adhesive layer.

2. The touch screen without wave pattern according to claim 1, characterized in that: The thickness of the coating layer between the OCA colloid layer and the ITO layer is 0.05 mm.

3. The touch screen without wave pattern according to claim 2, characterized in that: The material of the adhesive coating layer is colorless, transparent and insulating liquid OCA adhesive.

4. The touch screen without wave pattern according to claim 3, characterized in that: The PET substrate is also provided with a wire connected to the ITO layer, an ACF arranged on the wire, and an FPC arranged on the ACF.

5. The touch screen without wave pattern according to claim 4, characterized in that: Waterproof glue is provided on the exposed part of the wire which is not covered by the glue coating layer and the ACF, and the FPC and the PET substrate are connected by glue dispensing.

6. A method for manufacturing a touch screen without wave patterns as described in any one of claims 1 to 5, characterized in that: include: S1: performing an aging treatment on the ITO film, pressing a dry film onto the ITO film, exposing the dry film, performing development and etching to remove the film, and etching grooves in the ITO layer; S2: printing silver paste on the ITO film, performing a second silver paste printing, and then baking; S3: After laser engraving silver paste to form a wire connected to the ITO layer, the surface of the ITO film is cleaned; S4: coating the surface of the ITO layer with liquid OCA glue, flattening it with a roller, and UV curing it to form the glue coating layer; S5: laminating the adhesive layer and the OCA colloid layer and degassing; S6: After laser cutting the sensor composed of the PET substrate, the ITO layer, the adhesive layer and the OCA colloid layer into a preset shape, the sensor is tested and cleaned; S7: Perform ACF pre-pressing and FPC hot pressing in sequence, connect the FPC and the wire, apply waterproof glue and perform FOG test, adhere the glass cover plate and degas; S8: Dispense glue on the glass cover plate, clean it, and perform a TP function test after attaching a protective film.

Images