CN203433494U - OGS capacitive touch screen - Google Patents

Abstract

The utility model discloses an OGS capacitive touch screen. A lamination structure includes a glass cover board layer, a transparent conducting layer, an insulation shading layer, a conducting oil layer and an anti-explosion film protection layer arranged from top down. The transparent conducting layer includes a pattern electrode and a wiring electrode. A groove is arranged in the insulation shading layer. The conducting oil layer is filled into the groove to act as a pin for electric connection with an FPC. The FPC provided with a touch control IC chip is connected to the conducting oil layer. By adopting the OGS capacitive touch screen provided by the utility model, touch screen product performance and reliability can be improved, production technique can be simplified, investment and production cost can be reduced and product yield and production efficiency can be improved.

Description

An OGS capacitive touch screen

technical field

The utility model relates to the technical field of touch screens, in particular to an OGS capacitive touch screen.

Background technique

As an intelligent human-computer interaction interface product, touch screen has been more and more widely used in many fields of social production and life, especially in the field of consumer electronics (such as smart phones, tablet computers, etc.) fastest.

There are many types of touch screen technologies, mainly including resistive, capacitive, infrared, surface acoustic wave and so on. The capacitive touch screen is not only responsive, supports multi-touch, but also has a long life. With the maturity of control IC technology, it has become the mainstream technology in the market. The new generation of OGS technology is capacitive touch screen will be a new direction of development. The current mainstream G/G touch screen panel structure is shown in Figure 1a and Figure 1b. Figure 1a is a double-sided ITO structure (DITO) sensor, and Figure 1b is a single-sided ITO structure (SITO) sensor. In Figure 1a and Figure 1b, the FPC 14 with the touch IC 15 is connected to the glass sensor 12, and then the sensor 12 and the cover glass 11 are bonded together through the organic transparent optical glue 13 to form a G/ G structure touch screen panel. The structure of the OGS touch screen panel is shown in Figure 2. The sensor is directly fabricated on the lower surface of the cover glass 21, and the OGS touch screen panel is formed after connecting the FPC 24 with the touch IC 25. From a technical point of view, compared with G/G touch screen technology, OGS touch screen technology has the advantages of simple structure, light, thin, and good light transmission because it saves a piece of glass substrate and bonding process, which is beneficial to reduce Production costs, improve product yield.

At present, the existing OGS touch screen product structure as shown in Figure 3a, at first on cover glass 11, print one deck organic insulating ink light-shielding layer 12, then make ITO transparent pattern electrode layer 13, FPC 14 (with The touch IC 15 ) is electrically connected to the pins of the ITO transparent electrode layer, and finally a layer of explosion-proof film 16 is pasted under the electrode layer to prevent the cover glass from breaking and causing danger. There will be many problems in the production process of this structure. First, the thickness of the screen printing ink is very thick, resulting in a high step between the ink and the glass, which directly affects the production of the ITO conductive layer pattern and its lead pins; secondly, the ink It is not resistant to high temperature, and it is difficult to obtain a low-resistance ITO conductive layer at low temperature; in addition, the adhesion of the ITO conductive layer to the ink is very poor, which directly affects the connection of FPC and the reliability of the product.

Figure 3b shows an improved OGS touch screen panel structure. By covering the surface 32 of the ink light-shielding layer with an organic leveling layer (OC layer) 37, this solves the step problem caused by the ink light-shielding layer and improves the cover. The flatness of the glass surface improves the uniformity of the ITO conductive layer, which facilitates the production of electrode lead pins and the connection of FPC. This structure, on the one hand, due to the heat resistance of ink and OC materials, especially ink, there are still problems with the resistance value and adhesion of the ITO conductive layer; on the other hand, due to the addition of a layer of OC, the product's The thickness and light transmittance have been affected to a certain extent, and the process has become more complicated.

Utility model content

The utility model mainly aims at the existing technical problems of the OGS touch screen, and proposes an OGS capacitive touch screen.

The concrete technical scheme that the utility model adopts is as follows:

A kind of OGS capacitive touch screen, it is characterized in that, the lamination structure from top to bottom includes glass cover plate layer, transparent conductive layer, insulating light-shielding layer, conductive ink layer, explosion-proof film protective layer; Described transparent conductive layer comprises The pattern electrode and the wire electrode are provided with a groove in the insulating light-shielding layer, and the conductive ink layer is filled into the groove as a pin for electrically connecting with the FPC, and the FPC with a touch IC chip is connected to the conductive ink layer. superior.

The OGS capacitive touch screen is characterized in that the transparent conductive layer is a patterned ITO conductive layer.

The OGS capacitive touch screen is characterized in that the material of the insulating light-shielding layer is black insulating ink, and the light-shielding layer is formed by screen printing.

The OGS capacitive touch screen is characterized in that grooves are arranged in the insulating light-shielding layer, and the routing electrode pins of the transparent conductive layer are located below the groove area.

The OGS capacitive touch screen is characterized in that the making of the groove can directly utilize the method of screen printing, and also can utilize the method of printing and laser etching; use conductive ink to fill the above groove, and make conductive The ink remains electrically isolated between the different grooves.

The OGS capacitive touch screen is characterized in that the glass cover layer is made of protective tempered glass.

The OGS capacitive touch screen is characterized in that the pattern of the conductive ink layer can be printed or etched by laser.

The OGS capacitive touch screen is characterized in that the color of the conductive ink is the same as that of the material of the insulating light-shielding layer.

The utility model has the advantages of:

Compared with the existing technology, the OGS capacitive touch screen proposed by the utility model can not only improve the electrical performance and uniformity of the ITO conductive layer, enhance the adhesion of the film, but also help realize the patterning of the ITO conductive layer, and facilitate the transparent electrode layer. The electrical connection between pins and FPC can simplify the production process and improve product performance, reliability and production efficiency.

Description of drawings

Figure 1a is a schematic diagram of a G/G touch screen panel structure with a double-sided ITO structure.

Figure 1b is a schematic diagram of a G/G touch screen panel structure with a single-sided ITO structure.

Figure 2 is a schematic diagram of the OGS touch screen panel structure.

Fig. 3a is a schematic diagram of a conventional OGS touch screen panel structure.

Fig. 3b is a schematic diagram of an existing improved OGS touch screen panel structure.

FIG. 4 is a schematic structural diagram of the OGS capacitive touch screen of the present invention.

Figure 5a is a schematic diagram of a screen structure for screen printing insulating black ink.

Fig. 5b is a schematic diagram of the ink layer structure of screen printing insulating black ink.

Fig. 6 is a schematic diagram of the graphic structure of an ink light-shielding layer cover plate.

Fig. 7a is a schematic structural view of a conductive ink layer formed by screen printing.

Fig. 7b is a schematic diagram of the final pattern structure of the black conductive ink.

Fig. 8 is a schematic diagram of the graphic structure of another ink light-shielding layer cover plate.

Detailed ways

In order to make the technical problems and technical solutions solved by the utility model clearer to those skilled in the art, the utility model will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

An OGS capacitive touch screen, the structure of which is shown in Figure 4. A transparent conductive layer 42, an insulating light-shielding layer 43, and a conductive ink layer 44 are sequentially fabricated on a cover glass (protective tempered glass) 41, and a touch IC chip The FPC45 of 46 is connected on the conductive ink layer 44, and a layer of explosion-proof film protective layer 47 is pasted on the conductive layer 42 surface. The above-mentioned transparent conductive layer 42 includes transparent pattern electrodes and transparent wire electrodes, there is a groove structure in the above-mentioned insulating light-shielding layer 43, and the above-mentioned conductive ink layer 44 fills the above-mentioned grooves as electrode pins connected to the FPC 45.

Embodiment one:

First make a transparent conductive layer (such as ITO) on the cover glass and pattern it, then screen print a layer of black insulating ink, directly form a strip groove structure inside the black ink layer, and then screen print a layer of black conductive Ink (such as carbon paste), the conductive ink pattern is the same as the groove structure pattern above, and finally the FPC is connected to the conductive ink by hot pressing.

Specific implementation steps:

1. Make a transparent conductive layer (such as ITO) on the cover glass and pattern it, use the method of vacuum magnetron sputtering to make an ITO transparent conductive film, and then go through the processes of gluing, exposure, development, film hardening, etching and film removal Graphical ITO.

Specific process parameters:

Coating vacuum degree: 0.01~0.5Pa, temperature: 220~300℃, thickness of ITO film layer: 10nm~20nm;

Coating photoresist, covering the etched ITO film layer, the thickness of the photoresist is 1600~2000nm, the uniformity is within 5%, the pre-baking temperature: 80~90℃;

Expose the photoresist, that is, photoetch the electrode pattern on the photoresist, the exposure conditions are: ultraviolet light wavelength: 365nm, luminous flux: 100~120mj, the mask of the ITO electrode pattern is a chrome plate, and the distance from the substrate is 100um~ 200um;

Develop and harden the photoresist, use NaOH, concentration 0.1~0.08MOL/L, temperature: 20~35°C, time 50 seconds~120 seconds, hardening temperature: 100~120°C, time 30~35 minutes;

Etching the ITO thin film layer to form the electrode pattern of the ITO thin film layer, etching materials: HCL60%~65%+HO2 40%~35%, temperature: 40~45°C, time: 120~220 seconds;

Remove photoresist to form ITO electrode, use material: NaOH, concentration 2.0~1.5MOL/L, temperature: 30~35℃, time 100 seconds~120 seconds, finally rinse with pure water;

2. An insulating black ink light-shielding layer is formed by screen printing, and there is a strip-shaped groove structure inside the ink layer.

The printed screen pattern structure is shown in Fig. 5a, comprising an ink permeable portion 52 and ink impermeable portions 51 and 53. The ink pattern formed by printing is shown in FIG. 5 b , including an ink area 55 , an ITO transparent electrode pattern area 54 and an ITO transparent electrode pin area 56 .

Specific process parameters:

The distance between screen and glass: mesh distance: 3.0-4.0mm, squeegee height 20-30mm, squeegee angle: 60-85 degrees, squeegee pressure 3.0-4.0Mpa;

Baking and sintering: Put the silk-screened glass into the oven; the oven heating time is 15-30 minutes, the constant temperature time is 25-35 minutes, the temperature is 130-160 °C, and the temperature difference is not more than 10 °C.

3. Then screen print a layer of black conductive ink (such as carbon paste), the conductive ink pattern is the same as the above-mentioned strip groove structure pattern, and finally connect the FPC to the conductive ink by hot pressing to complete the electrode layer of FPC and ITO pattern The electrical connection between the final OGS product structure is shown in Figure 4 above.

Example two:

First make a transparent conductive layer (such as ITO) on the cover glass and pattern it, then screen print a layer of black insulating ink, use laser etching to make a strip groove structure, and then screen print a layer of black conductive ink (such as carbon paste), also use laser etching to make conductive ink graphics, the graphics are the same as the above groove structure graphics, and finally connect the FPC to the conductive ink by hot pressing. Compared with the method of directly using screen printing in the first embodiment, this embodiment has greatly improved the precision of the strip groove structure and the yield rate of the product.

Specific implementation steps:

1. Make a transparent conductive layer (such as ITO) on the cover glass and pattern it.

2. Form an insulating black ink light-shielding layer by screen printing. The graphic structure of the ink layer is shown in Figure 6, including the ITO graphic electrode layer area 61 and the ink area 62.

3. Use the laser etching process to make a strip groove structure in the ink area, as shown in Figure 5b.

4. Use screen printing to form a conductive ink (such as carbon paste) layer. The graphic structure of the ink layer is shown in Figure 7a, where 71 is a conductive black ink (such as carbon paste).

5. Use a laser etching process to remove excess conductive ink, so that the conductive ink just fills the above strip groove structure area. The final graphic structure of the conductive ink is shown in Figure 7b, where 72 is the conductive ink area.

6. Finally, connect the FPC to the conductive ink by hot pressing to complete the electrical connection between the FPC and the ITO pattern electrode layer. The final OGS product structure is shown in Figure 4 above.

Embodiment three:

First make a transparent conductive layer (such as ITO) on the cover glass and pattern it, then screen print a layer of black insulating ink, form a long strip groove structure inside the black ink layer, and then screen on the groove structure pattern Print a layer of black conductive ink (such as carbon paste), use laser etching technology to pattern the conductive ink layer to form the pins of the ITO pattern electrode, and then screen print a layer of insulating ink to expose the pins formed by the conductive ink part. Finally, the FPC is connected to the conductive ink by thermal compression.

Specific implementation steps:

1. Make a transparent conductive layer (such as ITO) on the cover glass and pattern it.

2. Form an insulating black ink light-shielding layer by screen printing. The graphic structure of the ink layer is shown in FIG.

3. Use screen printing to form a conductive ink (such as carbon paste) layer above the groove structure pattern. The graphic structure of the ink layer is shown in Figure 7a, and 71 is a conductive black ink (such as carbon paste).

4. Use a laser etching process to remove excess conductive ink, so that the conductive ink just fills the above strip groove structure area. The final graphic structure of the conductive ink is shown in Figure 7b, where 72 is the conductive ink area.

5. Then print a layer of black insulating ink through screen printing. The graphic structure of the ink layer is the same as that in Figure 7a. Then use laser etching to remove the insulating ink above the conductive ink, and expose the part of the black conductive ink area as a connection to the FPC. pin.

6. Finally, connect the FPC to the conductive ink by hot pressing to complete the electrical connection between the FPC and the ITO patterned electrode layer. The final OGS product structure is shown in Figure 4 above.

Claims (8)

1. an OGS capacitive touch screen, is characterized in that, rhythmo structure from top to bottom comprises glass cover flaggy, transparency conducting layer, insulation light shield layer, conductive ink layer, blow-out disc protective seam; Described transparency conducting layer comprises pattern electrode and walks line electrode, in insulation light shield layer, is provided with groove, and conductive ink layer is filled into described groove as carrying out with FPC the pin that electricity is connected, and with the FPC of touch-control IC chip, is connected on conductive ink layer.

2. OGS capacitive touch screen as claimed in claim 1, is characterized in that, the ITO conductive layer that described transparency conducting layer is patterning.

3. OGS capacitive touch screen as claimed in claim 1, is characterized in that, the material of described insulation light shield layer is black dielectric ink, and the mode by screen painting forms light shield layer.

4. OGS capacitive touch screen as claimed in claim 1, is characterized in that, in described insulation light shield layer, is provided with groove, and grooved area below is the cabling electrode pin of transparency conducting layer.

5. the OGS capacitive touch screen as described in claim 1 or 4, is characterized in that, the making of described groove can directly utilize the method for screen painting, also can utilize the method for printing and laser ablation.

6. OGS capacitive touch screen as claimed in claim 1, is characterized in that, described glass cover flaggy adopts protection tempered glass.

7. OGS capacitive touch screen as claimed in claim 1, is characterized in that, the pattern of described conductive ink layer can pass through mode of printing, also can pass through laser ablation mode.

8. OGS capacitive touch screen as claimed in claim 1, is characterized in that, the color of described electrically conductive ink is identical with the material color of insulation light shield layer.

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