CN204288196U - A kind of laser etch process capacitance touch screen - Google Patents

Abstract

The utility model discloses a capacitive touch screen with a laser etching process. The capacitive touch screen with a laser process comprises a transparent substrate and an ink layer, a shadow erasing layer, an ITO electrode, black bottom-covering ink and silver paste sequentially stacked on the transparent substrate; The silver paste is a regular pattern, which is distributed in the bonding area or the non-window area, and the black cover ink is a regular pattern. The utility model solves the ESD failure problem of the capacitive touch screen in the laser etching process, solves the jagged edge problem of the visible area, and reduces the ITO etching pattern through the material selection of the bonding PIN of the capacitive touch screen and the reasonable design of the ink printing process. The production process of the touch screen is reduced, the product quality is effectively improved and the production cost of the product is reduced.

Description

A capacitive touch screen with laser etching process

technical field

The utility model relates to the technical field of capacitive touch screens, in particular to a capacitive touch screen with laser etching technology.

Background technique

The basic principle of the capacitive touch screen is to use the current induction of the human body to work. The capacitive touch screen is a two-layer composite glass screen. The inner surface of the glass screen is coated with ITO (indium tin oxide) conductive film (coated conductive glass). The outer layer is a thin layer of silica glass protective layer, ITO coating as the working surface, and four electrodes are drawn from the four corners. When the finger touches the screen, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitance. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point, and the current flows out from the electrodes on the four corners of the touch screen respectively, and the current flowing through the four electrodes is the same as that from the finger to the four corners. Proportional to the distance, the controller obtains the position of the touch point through accurate calculation of the four current ratios.

The production of the traditional single-chip capacitive touch screen is to coat the tempered glass with an ITO film layer and complete it through the yellow light process. The process includes: 1. Vacuum coating, 2. Photoresist coating, 3. Exposure, 4. Development, 5. Etching, 6. Baking, 7. Stripping, etc. Since the touch screen structure includes multi-layer conductive lines (including lead-out lines) and insulating layers or protective layers between different layers, the above process needs to be repeated many times (generally 4 to 6 layers).

Therefore, the traditional yellow light process OGS (touch screen) production process is complex, with many processes, high equipment investment, large workshop area, high energy consumption, and the need to use a large amount of strong acid and alkali in the yellow light developing process, which is not conducive to environmental protection. Therefore, it is extremely urgent to find a production method with simple process, low input cost and environmental protection. The production of OGS by laser technology can relatively reduce 10-20 processes. The principle of laser etching is through precise positioning and energy balance control, using laser high temperature to partially vaporize the ITO film layer plated on the surface of the glass substrate according to the design drawings, thereby forming ITO lines and electrodes. However, due to the high impedance of the laser process OGS finished product, the resistance to ESD testing is weak, and during the laser etching process, the ink at the edge of the visible area is broken down to form a jagged shape.

Utility model content

The technical problem to be solved by the utility model is to provide a laser process capacitive screen production method, using silver paste low-resistance material as the bonding electrode and adopting the cover bottom ink reverse cover process through lamination optimization, so as to solve the resistance of the laser process OGS finished product to the ESD test Weak ability and ink jaggedness at the edge of the viewing area.

In order to achieve the above object, the utility model adopts the following technical solutions:

A laser process capacitive touch screen, comprising a transparent substrate and an ink layer, an erasing layer, an ITO electrode, black cover ink and silver paste sequentially stacked on the transparent substrate; the silver paste is a regular pattern, distributed in the bonding area or In the non-window area, the black cover ink is a regular pattern.

The silver paste is a low-impedance conductive material, all silk-screened on the bonding PIN in the bonding area, replacing ITO and directly conducting with the FPC gold finger, with a thickness of 5-30 μm.

The ink layer is composed of two layers of laser-resistant inks. The inner ring size of the main color ink of the first layer is expanded by 0-0.5mm from the visible area, and the second layer is expanded by 0-0.2mm based on the ink of the first layer. The layer thickness is 4-12 μm.

The ink layer is composed of four layers of laser-resistant ink, the first three layers are white ink, the fourth layer is black ink, the size of the inner circle of the first layer of ink is 0~0.5mm outside the visible area, and the patterns of the remaining three layers of ink are The ink on the previous layer is expanded by 0~0.15mm, and the thickness of each layer is 4-12μm.

The size of the inner circle of the cover bottom ink is the size of the visible area of the touch screen, and the thickness is 4-20 μm.

A method for manufacturing a laser process capacitive touch screen, comprising the steps of:

Formation of ink layer: the glass substrate is screen-printed to form a uniform main color ink layer with a thickness of 15-30μm;

Formation of the disappearing layer: The disappearing materials TiO 2 and SiO 2 are vacuum coated and deposited on the glass substrate

Formation of ITO electrode: After ITO coating, a layer of transparent and uniform thickness ITO film is formed on the glass substrate, and its thickness is 50 angstroms to 2000 angstroms;

After ITO-coated glass substrate, laser etching machine is used to etch the ITO to meet the requirements and regular ITO patterns or electrodes;

Black cover ink formation:

In the white scheme, the glass substrate forming the electrodes is screen-printed with a layer of white ink first to form a reverse cover process. The size of the inner frame is the size of the visible area and the thickness is 4-12 μm; Ink, the size of the inner frame is 0-0.8mm outside the size of the visible area;

Silver paste formation:

The glass substrate with over-covering ink is screen-printed to form a layer of silver paste with a uniform thickness on the ITO electrode in the bonding PIN area of the glass substrate, with a thickness of 5-30 μm.

The ink layer has four layers of ink in total, and the order of silk screen printing is three layers of white ink and one layer of black ink; the inner circle size of the first layer of white ink is 0~0.3mm outside the visible area, and the patterns of the remaining three layers of ink are all above A layer of ink spreads 0~0.15mm, and the thickness of each layer is 4-10μm to form a step with a small slope and height at the edge.

A method for manufacturing a laser process capacitive touch screen, comprising the steps of:

Formation of the ink layer: the glass substrate forms a uniform ink layer with a thickness of 5-20 μm through the silk screen process;

Formation of the disappearing layer: the disappearing materials TiO 2 and SiO 2 are deposited on the glass substrate by vacuum coating;

Formation of ITO electrode: After ITO coating, a layer of transparent and uniform thickness ITO film is formed on the glass substrate, and its thickness is 50 angstroms to 2000 angstroms;

After ITO-coated glass substrate, laser etching machine is used to etch the ITO to meet the requirements and regular ITO patterns or electrodes;

Formation of black cover ink: the glass substrate forming the electrode in the black scheme is processed by silk screen printing to form a black cover ink layer with uniform thickness on the glass substrate, and the size of the inner frame is the size of the visible area to form a reverse cover process, the thickness is 4~12μm;

Formation of silver paste: The glass substrate with silk screen printing over-covering ink, after the silk screen printing process, forms a layer of silver paste with a uniform thickness on the ITO electrode in the bonding PIN area of the glass substrate, with a thickness of 5-30 μm.

The ink layer is formed by screen printing twice on the transparent substrate. The inner circle of the first layer of ink is expanded by 0~0.3mm from the visible area, and the second layer is expanded by 0~0.15mm based on the first layer of ink. , the thickness of each layer is 4-10μm.

The silver paste is only screen-printed on the ITO electrode in the bonding area;

The size of the inner circle of the ink of the first layer of the main color ink is 0~0.3mm outside the visible area, and the pattern of each other layer of ink is 0~0.15mm outside the ink of the previous layer, and the thickness of each layer is 4~0. 12 μm.

The laser etching machine adopts the principle of excitation radiation to amplify photons in an avalanche through a resonant cavity to form a powerful photon beam with a single emission direction, frequency, polarization, and light wave phase, so as to cut objects. The width of the laser line is 15-40μm, and the relative position accuracy of the ITO pattern and the main color ink is ±5μm.

The ITO electrode is a conduction electrode in a horizontal direction or a vertical direction, and has a regular graphic structure; the ITO electrode is composed of the ITO conduction electrode 1 and the ITO conduction electrode 2, and the ITO conduction electrode 1 and the ITO conduction electrode 2 are on the same level , independent of each other, insulated from each other, staggered design.

The ITO is composed of In ₂ O ₃ and SnO ₂ with a mass ratio of 85-95:5-15. The way of ITO coating can be vacuum magnetron sputtering, chemical vapor deposition, thermal evaporation, sol-gel.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

Through reasonable optimization of bonding electrode materials and laminated structures, the weak resistance to ESD testing of existing products and ink jaggedness at the edge of the visible area are solved, and the production process of the touch screen is reduced, which effectively reduces the production cost of the touch screen.

Description of drawings

Fig. 1 is a schematic diagram of the stacked structure of the black scheme laser technology touch screen section stacking structure described in the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the glass substrate described in the embodiment of the present invention;

Fig. 3 is a schematic diagram of a cross-sectional stacked structure of a white scheme laser technology touch screen according to an embodiment of the present invention;

Detailed ways

Below in conjunction with specific embodiment the utility model is described in further detail.

As shown in Figures 1 and 2, the black OGS scheme laser process capacitive touch screen includes a chemically strengthened glass substrate 1 with a thickness between 0.5mm and 2.0mm (resin material substrates can also be used), which are sequentially stacked on the The main color ink 2, the erasing layer 3, the ITO electrode 4, the cover bottom ink layer 5, and the silver paste 6 of the transparent substrate; the ITO electrode is a horizontal or vertical conduction electrode, and has a regular pattern structure; the ITO electrode includes Capacitive screen drive (ITO electrode 1) and sensing electrode (ITO electrode 2), ITO electrode 1 and ITO electrode 2 are on the same layer, independent of each other, insulated from each other, and interleaved design. The transparent substrate includes a window area 21 and a non-window area 22, and a black resin layer and a colored ink layer are distributed in the non-window area of the display screen.

Its preparation process is as follows:

Formation of main color ink: the glass substrate is screen-printed to form an ink layer with uniform thickness. The main color ink thickness of the black OGS scheme is 5-20μm;

The main color ink of the black OGS scheme adopts laser-resistant ink, which is screen-printed twice on the transparent substrate. The size of the inner circle of the ink on the first layer is expanded by 0~0.3mm from the visible area, and the ink on the second layer is based on the first layer of ink. The base is expanded by 0~0.15mm, and the thickness of each layer is 4-12μm.

After each layer of silk screen printing is completed, only the surface layer is dried to improve the efficiency of silk screen printing. After everything is done, it is fully baked and dried.

Formation of the vanishing layer:

The disappearing materials TiO 2 and SiO 2 are deposited on the glass substrate by means of vacuum magnetron sputtering.

Formation of ITO electrodes: The transparent substrate is coated with ITO, so that a layer of transparent and uniform ITO film layer is formed on the glass substrate, and its thickness is 50 angstroms to 2000 angstroms (surface resistance is 10 to 430 ohms);

After the ITO-coated glass substrate, use a laser etching machine to etch the ITO to meet the requirements and regular ITO patterns or electrodes according to the drawings;

The laser etching machine adopts the principle of stimulated radiation to amplify photons in avalanche through a resonant cavity to form a powerful photon beam with single emission direction, frequency, polarization and light wave phase, so as to cut objects. The width of the laser line is 15-40μm, and the relative position accuracy of the ITO pattern and the main color ink is ±5μm.

The ITO electrode is a conduction electrode in a horizontal direction or a vertical direction, and has a regular graphic structure; the ITO electrode is composed of the ITO conduction electrode 1 and the ITO conduction electrode 2, and the ITO conduction electrode 1 and the ITO conduction electrode 2 are on the same level , independent of each other, insulated from each other, staggered design.

The ITO is composed of In ₂ O ₃ and SnO ₂ with a mass ratio of 85-95:5-15. The way of ITO coating can be vacuum magnetron sputtering, chemical vapor deposition, thermal evaporation, sol-gel.

Covering Ink Formation:

The glass substrate that forms the electrode is subjected to a silk screen printing process to form a layer of ink layer with a uniform thickness on the glass substrate.

After the bottom ink is baked, a regular black layer pattern with a thickness of 5-20 μm is finally formed.

Silver paste formation:

The glass substrate with over-covering ink is screen-printed to form a layer of silver paste with a uniform thickness on the ITO electrode in the bonding PIN area of the glass substrate. As the electrode in contact with the FPC gold finger, the thickness is 5~20μm;

After the silver paste is baked, a regular silver paste pattern electrode with a thickness of 5-20 μm is finally formed.

Another embodiment of the present invention adopts the white OGS scheme. As shown in Figure 3, it is a schematic diagram of the cross-sectional stacked structure of the laser process touch screen in the white scheme described in the embodiment of the present invention, including a chemically strengthened glass substrate 1 (resin material substrate can also be used) with a thickness between 0.5 mm and 2.0 mm, followed by Three layers of white main color ink 2, black ink 3, shadow erasing layer 4, ITO electrode 5, white reverse cover ink layer 6, bottom cover ink layer 7, and silver paste 8 laminated on the transparent substrate.

The difference between the white OGS solution and the black OGS solution used in the previous embodiment is that the ink layer of the white OGS solution has four ink layers in total, and the silk screen printing sequence is three layers of white main color ink 2 and one layer of black ink 3 . The size of the inner ring of the first layer of white ink is 0~0.3mm outside the visible area, and the patterns of the other three layers of ink are 0~0.15mm away from the previous layer of ink, and the thickness of each layer is 4-10μm so that it is on the edge Form a step with little slope and height. The main color ink thickness of the white OGS scheme is 15-30μm.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (5)

1. A laser process capacitive touch screen, characterized in that: the laser process capacitive touch screen comprises a transparent substrate and an ink layer, an image erasing layer, an ITO electrode, black ink and silver paste that are sequentially stacked on the transparent substrate; The silver paste is a regular pattern, which is distributed in the bonding area or the non-window area, and the black cover ink is a regular pattern. 2. The laser process capacitive touch screen according to claim 1, characterized in that: the silver paste is a low-impedance conductive material, all of which are silk-screened on the bonding PIN in the bonding area, replacing ITO and FPC gold fingers for direct conduction, The thickness is 5-30μm. 3. A laser process capacitive touch screen as claimed in claim 1, characterized in that: the ink layer is composed of two layers of laser-resistant ink, and the inner circle size of the main color ink of the first layer is 0~0.5 outside the visible area. mm, the second layer expands 0~0.2mm based on the first layer of ink, and the thickness of each layer is 4-12μm. 4. A laser process capacitive touch screen as claimed in claim 1, characterized in that: said ink layer consists of four layers of laser-resistant ink, the first three layers are white ink, the fourth layer is black ink, the first layer of ink The size of the inner ring is 0~0.5mm outside the visible area, and the patterns of the other three layers of ink are 0~0.15mm outside the ink of the previous layer, and the thickness of each layer is 4-12μm. 5. A capacitive touch screen with laser technology according to claim 1, characterized in that: the size of the inner circle of the cover bottom ink is the size of the visible area of the touch screen, and the thickness is 4-20 μm.