WO2015026062A1

WO2015026062A1 - Non-display portion pattern forming method

Info

Publication number: WO2015026062A1
Application number: PCT/KR2014/006469
Authority: WO
Inventors: 박일우; 김태균; 조성훈
Original assignee: 동우화인켐 주식회사
Priority date: 2013-08-23
Filing date: 2014-07-17
Publication date: 2015-02-26
Also published as: JP6282737B2; JP2016534443A; TW201508589A; CN105473341A; CN105473341B; KR20150022383A

Abstract

The present invention relates to a non-display portion pattern forming method and, more particularly, to a non-display portion pattern forming method wherein ink is applied to a surface of a pad, and the pad is compressed against an engraved recess portion, which is formed on a non-display portion of a surface of cover window glass, such that the ink on the surface of the pad is transferred to the recess portion, thereby forming a pattern; accordingly, the method has an excellent degree of precision, the method can form a pattern even in the case of a deeply engraved recess portion, and the method can also be applied to larger-area cover window glass on which a plurality of unit cells are formed.

Description

Non-display pattern forming method

The present invention relates to a method of forming a non-display portion pattern.

Typically, the touch screen is a screen equipped with a special input device to receive the position when touched by hand (touch).

The touch screen can receive input data directly from the screen so that when a person's hand or an object touches a character or a specific location on the screen without using a keyboard, the location can be detected and processed by stored software. It is.

In FIG. 1, an image display device (mobile phone) including a touch screen panel is illustrated. In this touch screen panel, a display portion refers to a portion where an image is displayed, and a non-display portion refers to an edge portion where an image is not displayed. The non-display unit is a top layer shown to the consumer, and a light blocking layer is formed so that the lower wiring is not visible to the user, and various patterns such as a company logo, an icon, and an IR pattern may be formed on the light blocking layer.

Such a pattern may be formed in the recessed groove portion formed in the light shielding layer, and conventionally, screen printing is mainly used.

However, recently, in order to improve process stability and efficiency, a plurality of unit cells including a transparent electrode stack are formed on a large area cover window glass, and then cut into individual unit cells to manufacture a touch sensing electrode. The printing method is not applicable due to the structural limitations of the plate making.

Specifically, as the plate making is applied to the screen mesh fixed to the frame by the squeeze, the mesh is stretched downward. In other words, the minimum gap needed to extend at the end of the frame is required.

However, when a plurality of unit cells are formed in the large area cover window glass, the gap between the unit cells is set narrow for the process yield, and thus, when printing on the plurality of unit cells simultaneously, a plurality of plate making is required.

This adds not only processing tolerances and assembly tolerances between the plates, but also differences in the tension of the meshes for each plate, resulting in poor printing accuracy, plus a gap equal to the thickness of the frame and the minimum gap needed to increase the mesh, requiring a wider gap. It is not applicable to the large area cover window glass in which the gap between the unit cells is set narrow.

In addition, it is possible to apply only to the thin engraved groove, so that when the light shielding layer is formed thick, printing may not be completely performed on the edge of the engraved groove, which may cause problems such as light leakage.

Korean Patent No. 1071683 discloses a touch window screen printing apparatus and method.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Korean Registered Patent No. 1071683

An object of the present invention is to provide a method for forming a non-display portion pattern having improved precision.

An object of the present invention is to provide a method of forming a non-display portion pattern applicable to a large area cover window glass having a plurality of unit cells.

1. A method of forming a non-display portion pattern by coating ink on a surface of a pad and pressing the pad to a recessed groove formed on a non-display portion of one surface of a cover window glass to transfer ink on the surface of the pad to the groove portion to form a pattern.

2. In the above 1, wherein the recessed groove portion is formed in the light shielding layer, non-display portion pattern forming method.

3. In the above 1, wherein the depth of the recessed groove portion is 2 to 30㎛, non-display portion pattern forming method.

4. In the above 1, wherein the pattern is an image, icon, logo or IR pattern, non-display pattern forming method.

5. In the above 1, the cover window glass is glass, polyethersulphone (PES, polyethersulphone), polyacrylate (PAR, polyacrylate), polyether imide (PEI, polyetherimide), polyethylene naphthalate (PEN, polyethyelenen napthalate ), Polyethylene terephthalate (PET, polyethyelene terepthalate), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC, polycarbonate), cellulose triacetate (TAC) And cellulose acetate propionate (cellulose acetate propionate, CAP) is formed of at least one material selected from the group consisting of, non-display pattern forming method.

6. In the above 1, wherein the cover window glass is a transparent electrode laminate is formed on the display portion, non-display portion pattern forming method.

7. In the above 1, the ink coating on the surface of the pad, and the pad is pressed in the recessed groove formed in the non-display portion of the unit cell in the cover window glass formed with a plurality of unit cells including a transparent electrode laminate, A non-display portion pattern forming method for transferring ink on a pad surface to the groove portion to form a pattern.

8. In the above 1, wherein the ink has a viscosity of 500 to 10,000cps, the non-display pattern forming method.

9. In the above 1, wherein the pad is formed of rubber, silicone or glue, non-display pattern forming method.

10. In the above 1, wherein the pad has an angle of 30 to 100 °, non-display portion pattern forming method.

The present invention can form a pattern having excellent precision.

According to the present invention, a pattern can be formed even in a deeply recessed groove portion.

The present invention is also applicable to a large area cover window glass in which a plurality of unit cells are formed.

1 is a perspective view of an image display apparatus (mobile phone) including a touch screen panel.

2 illustrates a process of forming a non-display portion pattern of each unit cell in a cover window glass in which a plurality of unit cells are formed.

3 is a side view of a pad according to an embodiment of the present invention.

The present invention provides excellent precision by coating ink on the surface of the pad, compressing the pad onto a recessed groove formed on a non-display portion of one surface of the cover window glass, and transferring ink on the surface of the pad to the groove to form a pattern. The present invention relates to a method of forming a non-display portion pattern that can be formed not only in a deeply recessed groove portion but also in a large area cover window glass in which a plurality of unit cells are formed.

In the present invention, as shown in Fig. 1, the non-display portion refers to an edge portion where an image is not displayed in the image display apparatus.

This non-display portion is a top layer seen by the consumer, and the light shielding layer is formed so that the lower wiring and the like are not visible to the consumer.

In addition, a pattern such as an image, an icon, a logo, or an IR pattern may be formed on the non-display portion. An IR pattern refers to a pattern of non-opaque portions through which light of a specific wavelength (eg, infrared light) for a sensor such as an illuminance sensor or a proximity sensor can pass.

In the past, the screen printing method was mainly used to form the non-display part pattern, which is mainly used to form a pattern having a thickness of about 8 μm, and when printing to the deeply recessed groove part, the internal bubble inside the recessed groove part at the time of printing. Is hard to escape, which may cause an unprinted portion inside the recessed groove. When the cover window glass in which such an unprinted portion exists is used for a display device, a problem occurs such that light passes through the unprinted portion and light leaks or a lower wiring is visually recognized.

Recently, in order to improve process stability and efficiency, a plurality of unit cells including a transparent electrode stack are formed on a large area cover window glass, and then cut into individual unit cells to manufacture a touch sensing electrode. For this reason, the distance between the unit cells is set to be narrow, so that the precision is inferior when forming a pattern by screen printing for each unit cell, and even when trying to print a plurality of unit cells at once by a large screen, There is a problem that the pattern is formed in the unwanted area.

However, according to the present invention, by transferring the ink on the pad surface to the recessed groove to form a non-display portion pattern, a pattern having better precision can be formed, and a thicker non-display portion pattern can be formed as well as a large area. Application is also applicable to a cover window glass.

Hereinafter, the present invention will be described in detail.

In the method of forming a non-display portion pattern according to the present invention, ink is coated on the surface of the pad 100, and the pad 100 is pressed against the recessed groove portion 30 formed on the non-display portion of one surface of the cover window glass 10 to form a pad ( 100) the ink on the surface is transferred to the groove portion 30 to form a pattern.

A light blocking layer is formed on the non-display portion, and the engraved groove portion 30 is formed on the light blocking layer.

The depth of the recessed groove 30 is related to the thickness of the shielding layer, and when the shielding layer is formed thick for shielding, the recessed groove 30 may also be deeply formed. The depth is not specifically limited, For example, it may be 2-30 micrometers. In particular, unlike the conventional printing method, in the case of the present invention, a pattern may be formed on the groove portion 30 thickly engraved with 10 to 30 μm.

Examples of the pattern include an image, an icon, a logo, an IR pattern, and the like.

The cover window glass 10 according to the present invention is not particularly limited as long as it is applied to a touch screen panel and the like so as to be sufficiently durable to protect them from external forces, and to allow a user to see the display well. The cover window glass 10 can be used without particular limitation. For example, glass, polyethersulphone (PES), polyacrylate (PAR, polyacrylate), polyetherimide (PEI, polyetherimide), polyethylene naphthalate (PEN, polyethyelenen napthalate), polyethylene terephthalate (PET, polyethyelene) terepthalate, polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC, polycarbonate), cellulose tri acetate (TAC), cellulose acetate propionate propionate, CAP) may be formed of a material. These can be used individually or in mixture of 2 or more types.

In the cover window glass 10 according to the present invention, a transparent electrode stack (not shown) may be formed on the display unit.

The cover window glass 10 including the transparent electrode stack is used for the touch screen panel as a glass-integrated touch sensing electrode.

In the case of forming the non-display portion pattern on the cover window glass 10 in which the transparent electrode laminate is formed, the ink used to form the pattern is a conductor, so when the pattern is formed in another portion beyond the recessed groove portion 30, a short ( Although a problem such as a short) may occur, the present invention can form a pattern only at a portion having a precisely engraved groove 30 so that occurrence of such a problem can be suppressed.

The laminate structure of the transparent electrode laminate may be adopted without limitation the laminate structure known in the art according to the specific use of the touch screen panel. For example, an electrode pattern, an insulating layer, a BM, an index matching layer (transparent dielectric layer), a protective layer, a scattering prevention film, and the like may be used in at least one layer to form a stacked structure in various orders, but is not limited thereto. no.

The electrode pattern detects the static electricity generated by the human body when the finger touches the display unit, which is the touch area of the image sensor, and connects the electrical signal to the signal.

The conductive material used for forming the electrode pattern is not particularly limited, and for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc oxide (IZTO), and cadmium tin oxide (CTO). ), PEDOT (poly (3,4-ethylenedioxythiophene)), carbon nanotubes (CNT), metal wires, and the like. These can be used individually or in mixture of 2 or more types.

The metal used for a metal wire is not specifically limited, For example, silver (Ag), gold, aluminum, copper, iron, nickel, titanium, telenium, chromium, etc. are mentioned. These can be used individually or in mixture of 2 or more types.

An electrode pattern circuit may be formed on the non-display portion corresponding region of the electrode pattern. The electrode pattern circuit serves to transfer an electrical signal generated in the electrode pattern to the FPCB, the IC chip, etc. by the touch of the display of the cover window glass 10. The electrode pattern circuit may be formed of the same material as the electrode pattern by the same method.

The insulating layer prevents an electrical short of the electrode, and the material is not particularly limited. For example, the insulating layer may be formed of a metal oxide such as silicon oxide, a polymer, an acrylic resin, or the like.

The index matching layer may be formed including niobium oxide, silicon oxide, or a mixture thereof.

The protective layer serves to prevent contamination and breakage from the outside of the laminated structure including the electrode pattern.

The anti-scattering film protects the patterns and prevents the cover window glass 10 from being scattered when it is broken.

The material of the anti-scattering film is not particularly limited as long as it provides durability and is a transparent material, and may be, for example, polyethylen terephthalate (PET).

The method of forming the anti-scattering film is not particularly limited, and for example, spin coating, roll coating, spray coating, dip coating, flow coating, doctor blade and dispensing (dispensing), inkjet printing, screen printing, pad printing, gravure printing, offset printing, flexography printing, stencil printing, imprinting methods, and the like.

In the cover window glass 10 according to the present invention, a plurality of unit cells 20 including a transparent electrode stack may be formed.

2 illustrates a process of forming a non-display portion pattern of each unit cell 20 in the cover window glass 30 in which the plurality of unit cells 20 are formed. The ink may be transferred onto the pad 100 to form a pattern.

The material of the pad 100 according to the present invention is not particularly limited, and for example, rubber, silicone, glue, or the like can be used. It is possible to transfer the ink easily even in the deeply recessed groove having the appropriate strength.

The pad 100 may have an internal angle of 30 ° to 100 °.

3 illustrates an embodiment of a pad according to the present invention. In the present invention, an inner angle of a pad refers to an angle at a contact point following a bus bar of an outer peripheral surface of the pad. When the inside angle of the pad is within the above range, the pattern may be formed so that the unprinted portion does not occur even in the thick groove portion 30 having a depth of 10 to 30 μm.

The ink used for forming the non-display portion pattern of the present invention is not particularly limited, and an ink including a colorant, a binder resin, an initiator, a solvent, and the like, which are commonly used in the art, may be used.

The ink according to the present invention preferably has a viscosity of 500 to 10,000 cps in terms of precision of pattern, thick pattern formation, and process efficiency, but is not limited thereto.

[Description of the code]

10: cover window glass 20: unit cell

30: engraved groove 100: pad

Claims

A method of forming a non-display portion pattern by coating ink on a surface of a pad and pressing the pad onto a recessed groove formed on a non-display portion of one surface of a cover window glass to transfer ink on the surface of the pad to the groove portion to form a pattern.
The method of claim 1, wherein the recessed groove is formed in the light blocking layer.
The method of claim 1, wherein a depth of the engraved groove is 2 to 30 μm.
The method of claim 1, wherein the pattern is an image, icon, logo, or IR pattern.
The method of claim 1, wherein the cover window glass is glass, polyethersulphone (PES), polyacrylate (PAR, polyacrylate), polyether imide (PEI, polyetherimide), polyethylene naphthalate (PEN, polyethyelenen napthalate), Polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC, polycarbonate), cellulose triacetate (TAC) and cellulose Method of forming a non-display portion pattern formed of at least one material selected from the group consisting of cellulose acetate propionate (CAP).
The method of claim 1, wherein the cover window glass has a transparent electrode laminate formed on a display unit.
The pad surface of claim 1, wherein an ink is coated on the pad surface, and the pad is pressed onto the recessed grooves formed in the non-display portions of the unit cells in the cover window glass in which the plurality of unit cells including the transparent electrode stack are formed. And the ink is transferred to the groove to form a pattern.
The method of claim 1, wherein the ink has a viscosity of 500 to 10,000 cps.
The method of claim 1, wherein the pad is formed of rubber, silicone, or glue.
The method of claim 1, wherein the pad has an internal angle of 30 ° to 100 °.