KR20140102027A - Method for manufacturing glass substrate for touch panel - Google Patents

Abstract

The present invention relates to a method for manufacturing a tempered glass substrate for a touch panel, which treats a glass disc with chemical tempering in a glass disc unit, forms a plurality of cell glasses by laser cutting at high speed without destroying a tempered layer of the tempered glass disc with printed BM and WM, ITO wires, and metal wires, and secondarily chamfers the cell glasses using a grinding machine with an electroplating tool and a diamond wheel. The method comprises the steps of chemically tempering a glass disc in a glass disc unit where a plurality of cells are partitioned; printing BM and WM and forming ITO wires and metal wires, on each cell of the surface of the tempered glass disc; cutting the tempered glass disc with printed BM and WM, ITO wires, and metal wires; and grinding and polishing the cut unit cells.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a tempered glass plate for a touch panel,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tempered glass plate for a touch panel, and more particularly, to a method of manufacturing a tempered glass plate for a touch panel, comprising chemical strengthening processing in units of sheet (original glass), BM / WM (BLACK / WHITE METRICS) A plurality of cell glasses were formed by laser cutting at a high speed without destroying the reinforcement layer of the original plate tempered glass, and then a touch was made to be chamfered by an electrodeposition tool and a diamond wheel with a second grinder (GRINDING M / C) Panel reinforced glass sheet.

In recent years, as the information age has come to a full-fledged information age, a display field for visually expressing electrical information signals has been rapidly developed. In response to this, various flat panel display devices having excellent performance of thinning, light weight, Flat Display Device) has been developed to replace CRT (Cathode Ray Tube).

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) (Electro Luminescence Display Device: ELD). In general, a flat panel display panel that realizes an image is an essential component. The flat panel display panel has a pair of light emitting or polarizing material layers interposed therebetween And a transparent insulating substrate facing each other.

In addition to the popularization of flat panel displays of such thinness, lightness and low power consumption, a touch panel used for selecting desired information through such a flat panel display device is extremely popular.

The touch panel may be classified into a resistive type, a capacitive type, and a resistive-multi type.

In the resistive film type, a resistive substance is applied on a glass or plastic plate, and a polyethylene film is covered thereon. Spacers are provided at regular intervals so that the two surfaces are not in contact with each other. The principle of operation is that if a constant current is applied at both ends of the resistive film, the resistive film acts like a resistive element having a resistive component, so that a voltage is applied across the resistive film. When touching with a finger, the polyurethane film on the upper surface is bent so that the surface is connected. Therefore, due to the resistance component of the two surfaces, it becomes the same shape as the parallel connection of the resistors, and the resistance value changes. At this time, a voltage change occurs due to a current flowing at both ends, and the position of the finger that is touched can be known as the degree of change of the voltage. The resistance film method has a disadvantage that it is operated by the surface pressure and has a high resolution and the fastest response speed, but it can not perform only one point and there is a great risk of damage.

The electrostatic capacity type is formed by coating a transparent special conductive metal (TAO) on both surfaces of a heat-treated glass. When a voltage is applied to the four corners of the screen, the high frequency spreads to the front of the sensor. When the finger touches the screen, the flow of electrons changes and detects the change and finds the coordinates. The correction capacity method has the advantage of high resolution and high durability, but it has a disadvantage that the reaction rate is low and it is difficult to mount.

The resistive-multi-touch method is a method of compensating and improving the maximum disadvantage of the resistive film method that can be performed only by one point, and is implemented so as to be practicable in the same manner as the corrected capacitance method.

In addition, the touch panel has advantages such as signal amplification problem, difference in resolution, difficulty in design and processing technology, as well as characteristic optical characteristics, electrical characteristics, mechanical characteristics, environmental characteristics, input characteristics, durability and economical efficiency of each touch panel And the resistance film type and the capacitance type are widely used in an electronic notebook, a PDA, a portable PC, a mobile phone (mobile phone) and the like.

The touch panel needs to be made thinner in order to increase the light transmittance to lower the display brightness, thereby realizing the same performance as the existing product, thereby reducing power consumption and increasing the battery usage time. However, it is necessary to use tempered glass because touch panels using thin glass can easily break down.

As a method for strengthening the glass substrate, a chemical strengthening method is used. The chemical strengthening method is a method of strengthening the glass by removing Na + ions contained in the glass and substituting the K + material.

A conventional method of manufacturing a tempered glass plate for a touch panel will now be described.

1 is a process flow chart for manufacturing a conventional tempered glass plate for a touch panel.

First, a disk glass of a large size including a plurality of cells is cut into a cell glass (S100). The cut cell glass is strengthened by a chemical strengthening method in units of glass (S200). A black mask is printed in the cut cell glass unit (S300). A transparent electrode is formed by ITO (Indium Tin Oxide) or the like in the cut cell glass unit (S400). A metal wiring is formed in the cut cell glass unit (S500). The touch module is formed by processes such as FPCB bonding and a hip (S600).

However, in the conventional method for manufacturing a tempered glass panel for a touch panel, the glass plate is cut into a cell glass, and chemical strengthening, black mask (BM) printing, ITO wiring, There is a problem that the process yield is lowered compared with the process in which the process is performed in the unit of a disk.

Recently, a large size glass substrate (original glass) is first chemically strengthened and then subjected to a primary cutting with a small size (cell glass) for a touch panel by a sanding blast, an etching (etching) , There are problems such as reduction of dimensional accuracy, poor process yield, and environmental hazards.

In the case of a product which has been cut and polished by such a machining method, a crack (crack) may easily occur due to the inclusion of a crack, and also due to a polishing tool design error, vibration of the mechanical device itself, There is a problem that it can not be processed by a cutting method utilizing a cutting, grinding device and an abrasive tool.

In addition, in the case of cutting and chamfering of a thin tempered glass having a certain reinforcing depth layer (not less than 40 micrometers), there is a problem that the glass can not be processed without cracking and scattering due to brittle fracture characteristics due to the reinforcing layer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a glass sheet, which does not destroy a reinforcement layer of a glass- A method for manufacturing a tempered glass plate for a touch panel, wherein a plurality of cell glasses are formed by laser cutting at a high speed and then chamfered by an electrodeposition tool and a diamond wheel with a grinder (GRINDING M / C) It has its purpose.

It is a further object of the present invention to minimize micro-micro-defects by applying an ultra-violet laser pulse to the unreinforced layer of the glass center instead of the upper and lower surface enhancement depth layers with reference to the tempered glass thickness centerline.

According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass plate for a touch panel, the method comprising: chemically strengthening a glass plate in a unit of a plurality of cells; Forming a BM / WM printing, a transparent electrode (ITO), and a metal wiring on each cell of the glass surface in the unit of the reinforced green sheet (disc glass); Cutting the green sheet tempered glass having the BM / WM printing, the transparent electrode (ITO) and the metal wiring formed thereon in a cell unit; And grinding and polishing each of the cut unit cells.

This can be done in two ways: a manual method consisting of a single device configuration and a SYSTEM method of an unmanned automation concept.

The method for manufacturing a tempered glass plate for a touch panel according to the present invention having the above-described features has the following effects.

It is made by chemically strengthening the large sheet of raw paper sheet, forming ITO substrate wiring, BM / WM (BLACK / WHITE METRICS) printing, metal wiring, The glass substrate can be easily formed and the process yield and mass production can be achieved at the same time.

In addition, in the present invention, after cutting and polishing the unreinforced area after reinforcement of the sheet in the unit of a sheet, micro-cracks (cracks) are minimized and the alignment and dimensional accuracy .

1 is a flowchart showing a process for manufacturing a conventional tempered glass plate for a touch panel
2 is a flowchart showing a process for manufacturing a tempered glass plate for a touch panel according to the present invention
3 is a view showing a process of manufacturing a tempered glass plate for a touch panel according to the present invention

A method of manufacturing a tempered glass plate for a touch panel according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 2 is a process flow chart for manufacturing a tempered glass plate for a touch panel according to the present invention, and FIG. 3 is a view illustrating a process for manufacturing a tempered glass plate for a touch panel according to the present invention.

As shown in FIG. 3, the original plate tempered glass (SG) according to the present invention is prepared by removing the Na + ions contained in the disk glass (G) and chemically reinforcing the K + The surface of the glass (G) is strengthened. An enhancement layer (H) having a predetermined thickness is formed on the upper surface, the lower surface, and the side surface of the disk glass (G). The circular plate tempered glass SG is divided into a plurality of cells C having a predetermined shape, so that a plurality of cell glasses (SGC) are obtained in one circular tempered glass SG. At this time, the plurality of cell glasses C may be provided as independent products having individual shapes.

A BM transparent electrode and a metal wiring are coated inside the cell C defined by the surface of the hardened layer H of the original plate tempered glass SG to have a touch window function for a display.

First, the surface of the disc glass G is strengthened by using a chemical strengthening method in which the disc glass G is loaded (ST100), the Na + ions contained in the disc glass are removed, and the K + ). Therefore, a hardened layer H having a predetermined thickness is formed on the upper surface and the lower surface, which are the surfaces of the disk glass G. [

The thickness of the disk glass G is about 0.4 mm to 2.0 mm and the sizes can be variously used such as 370 mm * 470 mm, 550 mm * 650 mm, 880 mm * 680 mm, 1300 mm * 1100 mm, 1500 mm * 1850 mm and 2200 mm * 2500 mm. The cured layer (H) has a thickness of 5 mu m to 60 mu m.

For reference, a 10.1-inch touch panel can be arranged in 28 cells in a 1300mm * 1100mm disc glass.

Then, a BM / WM (Black / White Matrix) layer is printed on a plurality of cells on the original plate tempered glass SG (ST300), and the BM / WM (Black / White Matrix) ITO wirings as transparent electrodes are formed (ST400), and metal wirings are successively formed in a plurality of cells of the disk-reinforced glass in which the ITO wirings are formed (ST500). In order to protect the BM / WM (Black / White Matrix) layer, the ITO wiring, and the metal wiring, a protective layer is formed on the entire surface (ST600). Here, the protective layer means an ionic coating of a PR resin, a DFR film, a tape for protecting a general pattern layer, and the like.

The thus formed disk-reinforced glass is loaded on a stage of a laser processing apparatus by a robot transfer device or a conveyor system, and vacuum adsorbed (ST700).

Then, to fix and align the original plate tempered glass (SG), it is moved to a recognition mark position for recognizing the position position with respect to the entire arrangement of the original plate tempered glass. That is, the vision module is fixed and the stage on which the product is mounted moves (ST800).

In order to cut and cut the original plate tempered glass in units of cells, vision recognition for the X axis is performed (ST900)

When the X-axis laser cutting operation is completed and the X-axis laser cutting operation is completed, the vision module is fixed for Y-axis vision recognition and the stage is rotated 90 degrees. Vision recognition is performed on the Y axis, and laser cutting operation based on the Y axis is performed.

The X, Y axis vision recognition recognizes the recognition mark for the X, Y axis position values using a vision camera (CCD module), and corrects the position value and the phase value using a vision system program. A more specific vision alignment, vision value, and displacement measurement method are disclosed in Patent Application No. 10-2011-0137316.

In order to recognize the position value and phase value, the Vision Module needs to fix the stage for recognizing the fast position value / phase value of 1300 * 1100 or larger large reinforced ledger sheet and to install two or more X, Y axis vision module Each axis is mounted and mounted so that it can be recognized and calibrated.

The laser cutting process uses a PICO laser (including IR and UV laser), focuses the laser beam on the inside of the disk-shaped tempered glass, moves the laser beam by a predetermined unit (several 탆 to several hundred 탆) The original plate tempered glass is cut and cut by irradiating the laser beam only to the inner designated area without affecting the depth and surface of the strengthened layer of the original plate tempered glass.

The cutting step is a step of cutting all of the laser beam into a straight line, a round, and a hole with a single laser source. The cutting step includes a method of cutting the hole shape by cutting only the unreinforced layer area, Through holes can be cut and cut to the layer.

In addition, the laser-cutting cutting step may be carried out with an inter-cell gap of 20 to 400 mu m.

When the cutting of the X and Y-axis straight lines is completed, the outer corner round of the product is cut, and when the laser cutting of the straight and round shapes is completed, the vacuum attraction force fixing the original plate tempered glass is released (ST1000).

Picked up with respect to the disk-toughened glass finished on the laser processing stage, and unloaded the disk-touched original glass (ST1100).

The unloaded original plate tempered glass is separated in units of cells, BM / WM (Black / White Matrix) / ITO wirings / metal wirings are formed, moved in units of laser-cut cell glass, pre-corrected and loaded (ST1200 , ST1300).

After being loaded into the polishing stage in a cell glass unit, the cell glass is vacuum-adsorbed onto the stage for fixation and alignment for the cell glass unit. And moves to the recognition mark position for recognizing the position position with respect to the cell glass. That is, the vision module is fixed and the stage on which the product is mounted moves (ST1400).

(ST1500), the side of the cell glass is grinded using a numerical control device (CNC) and edge grinding for the linear outer edge and corner round of the cell glass based on the X / Y axis / Grinding / Polishing operation is performed, and the CNC Grinding / Polishing operation for the hole is performed (ST1600).

Here, in the grinding / polishing process using the numerical control device and the chamfering device, the grinding process is first performed on the straight outer edge and the corner round of the cell glass, and the second round grinding polishing is performed on the straight line, round and hole. After such straight lines, rounds, and holes are polished, a polishing process is further performed to eliminate cracks and chipping.

Then, an air shower and a cleaning process are performed to remove foreign substances / contaminants / glass particles on the surface of the product of the unit of the cell in which the CNC Grinding / Polishing work is completed.

Upon completion of the air shower and washing process, the vacuum adsorption force fixing the cell unit glass is released, and the glass unit is picked up against the cell glass, and the picked-up cell glass is unloaded.

The unloaded cell glass is transferred to the cleaning process through the conveyor. The surface and the processed side of the finished touch panel of the cell unit are cleaned with ultrapure water (DI).

The appearance, dimension and grinding amount of the processed portion of the touch panel in the unit of the cell are measured to judge whether or not the touch panel is being cleaned. In addition, in the case of the system configuration method, the bad data about the dimension and the grinding amount are transmitted to the numerical control unit and the control is applied. Also, in case of a defective product, it is possible to perform a reheating process by feedback to a previous process. Then, a hydrofluoric acid treatment can be performed on the good product for strength compensation. At this time, the solution is immersed in a hydrofluoric acid solution (5%) for about 2 minutes and neutralized with DI water (ST1800).

Finally, the hydrofluoric acid-treated cell glass is unloaded, and the surface and processed side portions are washed and dried with ultrapure water (DI). The hydrofluoric acid treatment and cleaning process may include a protective layer for protecting the touch panel and a peeling zone for removing the tapes. In addition, an automatic vision inspection process is performed to inspect the product for which the process has been completed, such as appearance inspection, rapid wiring, and ITO pattern damage or short circuit, and then the inspection process such as FPCB bonding, .

The touch panel thus formed can be applied to a touch screen (TSP) cover glass for a mobile, a tablet PC, a smart PC, a monitor, a TV, and an advertisement display terminal.

For reference, the present invention is not characterized by a machining apparatus for cutting and polishing a disk-reinforced glass, so that the description of the above machining apparatus is omitted, and a similar apparatus is disclosed in FIGS. 3 and 4 of Patent Application 10-2011-0137316 Respectively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

G: original glass SG: original glass tempered glass
H: Cured layer

Claims (8)

Chemically strengthening the disk glass of the sheet unit in which a plurality of cells are partitioned;
Forming BM / WM printing, ITO coating and metal wiring on each cell of the reinforced disc glass surface;
Cutting the original plate tempered glass having BM / WM printing, ITO coating, and metal wiring formed thereon in a cell unit; And
And grinding and polishing each of the cut-off unit cells. The method according to claim 1,
Wherein the cutting cutting step cuts the original plate tempered glass by cutting the original plate tempered glass by focusing the laser beam inside the original plate tempered glass so as not to affect the chemically strengthened reinforcing layer, Wherein the tempered glass is manufactured by a method comprising the steps of: The method according to claim 1,
The cutting cutting process is characterized in that the recognition mark for the positional values of the X and Y axes of the original plate tempered glass is recognized by the vision camera, and the position and phase values are corrected by the vision system program and cut using a laser. A method for manufacturing a tempered glass for a touch panel. The method according to claim 1,
Wherein the cutting step is performed by cutting a laser source into a straight line, a round, and a hole. The method according to claim 1,
The cutting cutting step may include a method of cutting the hole shape by cutting only the unreinforced layer region and a method of manufacturing a tempered glass for a touch panel characterized by through hole cut cutting for the reinforced and unreinforced layer . The method according to claim 1,
Wherein the laser cutting step is carried out with an interval between cells of 20 to 400 mu m. The method according to claim 1,
Wherein the step of grinding and polishing the cut-
Grinding / polishing side portions in a linear, round and hole shape using a numerical control device and a chamfering device;
A second grinding polishing of a straight line, a round, a hole and the like,
Further comprising the step of polishing to remove cracks and chipping. The method according to claim 1,
After the step of grinding and polishing the cut unit cells,
Cleaning the cell glass,
Measuring the appearance, dimensions, and the amount of grinding with respect to the processing area of the touch panel of the cell glass unit,
And a step of hydrofluoric acid treatment for strength of the good product.

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