KR20140012405A

KR20140012405A - Printing method for touch window

Info

Publication number: KR20140012405A
Application number: KR1020120079197A
Authority: KR
Inventors: 배윤미
Original assignee: 엘지이노텍 주식회사
Priority date: 2012-07-20
Filing date: 2012-07-20
Publication date: 2014-02-03

Abstract

The present invention includes a step of printing and forming a first print pattern on the bottom edge of the transparent window by a pad printing method, and sequentially printing at least one or more second print patterns on the first print pattern by the pad printing method. It provides a touch window printing method.

Description

Touch Window Printing Method {PRINTING METHOD FOR TOUCH WINDOW}

The present invention relates to a method for forming a printing unit of a touch window.

The touch window may be a cathode ray tube (CRT), a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP) And an electro luminescence device (ELD), and is a device for inputting predetermined information to an electronic device by pressing a touch panel while a user views the image display device.

1 is a cross-sectional view showing the structure of a touch window according to the prior art.

As shown in FIG. 1, the touch window includes a transparent window (Window, 10), a print pattern portion 20 having a print pattern under the transparent window 10, and a touch screen panel under the print pattern portion 20. do. The touch screen panel (TSP) includes an upper OCA (Optically Clear Adhesive) film 30, an upper electrode layer (ITO; Indium Tin Oxide, 31), an insulator layer 40, and a lower OCA film (below). 50, it is common to have a structure of the lower electrode layer 51. The lower electrode layer 51 is adhered to the liquid crystal module (LCD) with the insulator layer 60 and the double-sided tape 70.

However, in the touch window, since the printing pattern part 20 is formed between the transparent window 10 and the touch screen panel, a uniformity decreases. If the printed pattern portion 20 is directly printed on the back surface of the transparent window 10, it is difficult to realize the optimum pitch of the bezel portion of the printed electrode due to the printing step. Low uniformity characteristics due to pin holes, protrusions, dents, etc., cause printing problems in implementing a direct patterned window (DPW).

In addition, in order to implement a narrow bezel part in which the touch window is being developed, it is necessary to effectively form a printing part of the transparent window.

An embodiment of the present invention provides a touch window printing method that can improve the straightness and uniformity of the bezel portion by forming a printing pattern on the bezel portion of the touch window by pad printing instead of screen printing. .

One embodiment of the present invention by forming a printing pattern on the back border of the transparent window by the sputtering method, there is provided a touch window printing method that the printing process is simplified without additional reinforcement printing.

One embodiment of the present invention provides a touch window printing method that can improve the print quality by implementing a narrow bezel by forming a print pattern on the rear edge of the transparent window using a black matrix method.

In the touch window printing method according to an embodiment of the present invention, a first printing pattern is formed by pad printing on the rear edge of the transparent window, and at least one second printing pattern is formed on the pad. Printing step by step in a printing method.

Forming the first print pattern or the second print pattern may include forming a width of the first print pattern or the second print pattern to 1 mm or less.

Forming the second print pattern may include forming the second print pattern that is the same as the first print pattern, or smaller or larger than the first print pattern.

In the touch window printing method according to another embodiment of the present invention, a first printing pattern is formed by a silk screen method on the back edge of the transparent window, and a second printing pattern is formed on the surface of the first printing pattern by pad printing. It involves doing.

After forming the second print pattern, the method may further include forming a third print pattern and a fourth print pattern on the second print pattern by the pad printing method.

In the touch window printing method, the second print pattern is formed smaller than the first print pattern, the third print pattern is formed smaller than the second print pattern, and the fourth print pattern is smaller than the third print pattern. It may include forming a.

In the touch window printing method, the second print pattern is formed smaller than the first print pattern, and the third print pattern is formed to have the same length as the first print pattern so that the third print pattern is the second print pattern. It may include to have a structure covering the.

According to another aspect of the present invention, there is provided a method of printing a touch window, by forming a black matrix on a black print area at a rear edge of a transparent window to prepare a first print pattern, and a second sputtering method on a colored print area of the back border. A printing pattern can be formed.

Providing the first print pattern may include forming the first print pattern as an inactive region of the transparent window as a rear edge of the transparent window.

According to one embodiment of the present invention, by forming a printing pattern on the bezel portion of the touch window using a pad printing method rather than screen printing, it is possible to improve the straightness and uniformity of the bezel portion.

According to one embodiment of the present invention, by forming a printing pattern on the back edge of the transparent window by the sputtering method, the printing process is simplified without additional reinforcement printing.

According to an embodiment of the present invention, by forming a printing pattern on the rear edge of the transparent window by the black matrix method, it is possible to improve the print quality by implementing a narrow bezel.

1 is a cross-sectional view showing the structure of a touch window according to the prior art.
2 is a plan view illustrating a touch window according to an embodiment of the present invention.
3 is a view showing a touch window printing method according to an embodiment of the present invention.
4 is a diagram illustrating various embodiments of a printing pattern according to an embodiment of the present invention.

Hereinafter, the configuration and operation according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same reference numerals denote the same elements regardless of the reference numerals, and redundant description thereof will be omitted. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

2 is a plan view illustrating a touch window according to an embodiment of the present invention.

Referring to FIG. 2, the touch window accepts the touch input through a transparent window that receives an external touch input, a screen area V / A of the transparent window, and an inactive area D / A. And a touch screen panel (TSP) including a wiring pattern for transferring the received touch input to a driving chip in a dead area.

In a first embodiment, a print pattern may be formed on the rear edge 20 of the transparent window by a pad printing method. The back border 20 may be an inactive area (black border) of the transparent window. The printing of the at least one second printing pattern may be performed sequentially on the first printing pattern by the pad printing method. In the pad printing method, ink is applied to a pad so that the pad contacts the back edge 20 so that ink is applied to the back edge 20, and the pad is lifted up.

In this case, a width of the first print pattern or the second print pattern may be formed to be 1 mm or less. The area of which the width is formed to be 1 mm or less is an area where printing patterns are formed on both sides when the transparent window is placed in front. A width of an upper end of the transparent window may be 2 mm, and a width of a lower function key area (F / A) of the transparent window may be 6 mm.

The second print pattern may be the same as the first print pattern, or smaller or larger than the first print pattern. The printed pattern formed in the non-active area is not printed only once, but is printed at least two to cover the wiring pattern formed in the non-active area. Therefore, when the print pattern is printed several times, a height difference occurs between the screen area where the print pattern is not printed and the inactive area where the print pattern is formed. When the height difference occurs, the uniformity of the printing pattern is lowered, so that it is difficult to realize the optimum pitch of the printing electrode, and the uniformity characteristics due to pin holes, protrusions, and dents are caused. This lowers the printing problem in implementing the DPW (Direct Patterned Window). Accordingly, in the present invention, in order to minimize the height difference, the second print pattern and the third print pattern formed after the first print pattern are the same as the first print pattern, or smaller than the first print pattern, or It can form large.

Therefore, as in the present invention, when the printing pattern is formed on the rear edge by the pad printing method, the straightness is excellent as ± 0.01 ~ 0.1μm, excellent uniformity, it is possible to implement a line width of 1mm or less.

3 is a view showing a touch window printing method according to an embodiment of the present invention. 3 is a cross-sectional view when the central portion of FIG. 2 is cut horizontally.

Referring to FIG. 3, in the second embodiment, the touch window printing method includes providing a transparent window 10 (310), and using a silk screening method on the rear edge 20 of the transparent window 10. The first print pattern 21 may be printed and formed (320), and the second print pattern 22 may be formed on the surface of the first print pattern 21 by the pad printing method (330). In the silk screen method, a valve is made manually or photochemically with a silk material in an area except the rear edge 20, and the ink passes through the rear edge 20 of the part without the valve when the ink is moved while pressing the inner surface of the screen. By printing.

As described above, after the second print pattern 22 is formed on the rear edge 20, the third print pattern 23 is formed on the second print pattern 22 by the pad printing method (340). In operation 350, the fourth printing pattern 24 may be formed on the third printing pattern 23 by the pad printing method.

Therefore, when the silk screen method and the pad printing method are mixed as in the present invention, the concealment force of the rear edge 20 is improved, the photo process is not required, and the process time is very long. short.

In the third embodiment, the touch window printing method forms a black matrix on the back border 20 of the transparent window to form a black matrix to prepare a first printing pattern, and the back border A second printed pattern is formed in the colored printing areas 20a and 20b of the 20 by the sputtering method.

In the black matrix, a black material is put in a region where a first print pattern is to be formed, and a fluorescent material, not a black material, is put in a region where the first print pattern is not formed, so that the first print pattern is formed of black material. The sputtering method utilizes a phenomenon in which, when an ion bombardment is applied to a substance, atoms or molecules constituting the substance stick out and adhere to the surrounding surface of an object. Therefore, in the touch window printing method, the second printing pattern may be formed by using a sputtering method on the colored printing areas 20a and 20b of the back border 20.

Therefore, the use of the black matrix only in the black printing area can solve the problems of thickness, step (height height), straightness, and uniformity of the printing pattern. However, when a printed pattern is formed using a black matrix, a photolithography process may need to be added. Only a black print area is formed with a black matrix, and the colored print area is sputtered. By forming the printing pattern, printing can be performed at low cost, and the processing step can be simplified.

In the above, the lengths and widths of the printed patterns that are printed several times may be the same as shown in FIG. 3. Alternatively, the touch window printing method may form a printing pattern in various ways.

4 is a diagram illustrating various embodiments of a printing pattern according to an embodiment of the present invention.

Referring to FIG. 4, in the first embodiment 410, the touch window printing method forms a second print pattern 22 smaller than the first print pattern 21 and smaller than the second print pattern 22. The third print pattern 23 may be formed, and a fourth print pattern (not shown) may be formed smaller than the third print pattern 23.

In a second embodiment 420, the touch window printing method forms a second print pattern 22 with a structure covering the first print pattern 21, and a third cover pattern with a structure covering the second print pattern 22. A print pattern 23 may be formed, and a fourth print pattern (not shown) may be formed in a structure covering the third print pattern 23.

In a third embodiment 430, the touch window printing method forms a second print pattern 22 smaller than the first print pattern 21, and has a third print pattern having the same length as the first print pattern 21. 23 may be formed to have a structure in which the third print pattern 23 covers the second print pattern 22.

Therefore, the touch window printing method may overcome the height difference of the printing patterns printed several times by forming the printing patterns in various embodiments as shown in FIG. 4.

The touch window according to the present invention can be attached to various display devices. That is, the display device may be not only a liquid crystal display but also an organic light emitting display device, a plasma display panel, or the like. In this case, a shielding layer may be selectively disposed between the touch sensing panel and the display device in order to prevent noise components generated by driving the display apparatus from being transmitted to the touch screen panel to cause a malfunction of the touch sensing panel. It may be.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

10: Transparent window
20: back border
21 to 24: print pattern
30: Screen area

Claims

Print-form the first print pattern on the back border of the transparent window by pad printing,
And sequentially printing at least one or more second printing patterns on the first printing pattern by the pad printing method.

The method of claim 1,
Forming the first print pattern or the second print pattern,
And forming a width of the first print pattern or the second print pattern to 1 mm or less.

The method of claim 1,
Forming the second print pattern,
And forming the second print pattern that is the same as the first print pattern, or smaller or larger than the first print pattern.

Print the first print pattern on the back border of the transparent window by a silk screen method (Pad Printing),
And forming a second printing pattern on a surface of the first printing pattern by a pad printing method.

5. The method of claim 4,
And forming a third print pattern and a fourth print pattern on the second print pattern by the pad printing method after forming the second print pattern.

6. The method of claim 5,
Forming the second print pattern smaller than the first print pattern,
Forming the third print pattern smaller than the second print pattern,
And forming the fourth print pattern smaller than the third print pattern.

6. The method of claim 5,
Forming the second print pattern smaller than the first print pattern,
And forming the third print pattern to have the same length as the first print pattern so that the third print pattern has a structure covering the second print pattern.

In order to prepare a first printing pattern, a black matrix is formed in the black print area at the rear edge of the transparent window.
And forming a second printing pattern in the colored printing area of the rear surface by a sputtering method.

9. The method of claim 8,
Providing the first print pattern,
And forming the first print pattern using a dead area (D / A; dead area) of the transparent window as a rear edge of the transparent window.