KR100350540B1 - Spacer of touch panel for inputting position coordinate and method for forming the same - Google Patents

Abstract

PURPOSE: A spacer of a touch panel for inputting a position coordinate and a method for forming the same are provided to obtain a spacer attached on a glass board uniformly by scattering tiny powder coated by an adhesive in a solution such as water, spraying the powder on glass boards, and executing a heat treatment on condition that no pressure is applied on the upper glass board and the lower glass board. CONSTITUTION: Tiny powder coated by an adhesive is compounded in a solution such as water in a ratio of 10 to 1 - 10,000 to 1, and scattered(S1). The compounded solution is sprayed on the lower glass board having a transparent electrode formed thereon under pressure of 10-500psi(S2). The solution such as water is dried(S3). A heat treatment is executed for five-thirty minutes at 100-150 degrees centigrade(S4).

Description

Spacer of touch panel for position coordinate input and forming method

The present invention relates to a spacer for maintaining a constant thickness of a cell gap layer in a touch panel for inputting position coordinates, and a method of forming the same. More specifically, an agglomeration is performed on an upper glass substrate and a lower glass substrate. In order to maintain a constant gap between the two substrates in the non-applied state, the powder coated with the adhesive is dispersed in a solution such as pure water, sprayed on a glass substrate, and heat treated to obtain a spacer uniformly attached to the glass substrate.

In general, the touch panel is coated with a transparent conductive film, and the upper portion is composed of a film and a lower glass substrate. The touch panel forms a spacer to maintain a constant gap between the upper and lower glass substrates, and at some position on the upper glass substrate. When pressure is applied, the upper and lower glass substrates are turned on, and the contact is released due to the restoring force of the film and the presence of the spacer at the moment the pressure is removed.

In this case, in order to control the accurate on / off and not deteriorate the display characteristics of the display element attached to the bottom of the touch panel, a spacer as small as possible and thin in thickness and uniform in distribution is required.

There are many conventional methods for forming a spacer, but in particular, in the case of a spacer formed by a thick film printing method, as shown in FIG. 1, a constant pressure is not applied between the upper glass substrate and the lower glass substrate 3. In order to maintain a constant gap between the two substrates, a dot spacer 4 is formed on the lower glass substrate 3 using the screen mask 5.

The dot spacers should be made as small and thin as possible in order not to degrade the display quality of the underlying display elements.However, the conventional dot spacers are limited in their size reduction due to the characteristics of the thick film printing method. 60 micrometers or more) In particular, as the size is printed to 60 micrometers or more, the uniformity becomes worse and the on / off control of the touch panel becomes incomplete.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to form a spacer that is as small as possible and has a uniform distribution so as not to degrade the display quality of a display element under the touch panel. By providing a spacer and a method of forming the touch panel for position coordinate input to improve the uniformity and display quality.

A feature of the spacer of the touch panel for position coordinate input according to the present invention for achieving the above object is to form a fine powder coated with an adhesive on a glass substrate to cure the adhesive.

A feature of the spacer forming method of the touch panel for position coordinate input according to the present invention for achieving the above object is, by coating a powder (spacer) of a fine size with an adhesive and mixing it in pure water (water) or a solution at a fixed ratio A first step of uniformly dispersing a dispersion solution, a second step of controlling the number of spacers per unit area by spraying the dispersion solution of the first step with a constant pressure on a lower glass substrate on which a transparent electrode is already formed, and the second step Thereafter, the third step of drying the pure water or solution, and the fourth step of performing a heat treatment for a predetermined temperature and a predetermined time after the third step.

Another feature of the method for forming a spacer of the touch panel for position coordinate input according to the present invention for achieving the above object is, by coating a fine size powder (spacer) with an adhesive and mixing it in pure water (water) or a solution in a fixed ratio And a second step of uniformly dispersing to form a dispersion, and a second step of controlling the number of spacers per unit area by spraying the dispersion of the first step with a constant pressure on a lower glass substrate on which a transparent electrode is already formed. After the seeding is made of a fifth step of performing a heat treatment for a constant temperature and a certain time while drying the pure water or solution.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the spacer of the position panel input touch panel according to the present invention and a manufacturing method thereof will be described in detail.

2A is an enlarged view of the spacer of the touch panel for position coordinate input according to the present invention. As shown in the drawing, a fine spherical spacer (or powder) 1 is formed and the spherical spacer 1 It is configured by coating a thermosetting adhesive (2) on the).

2B is a cross-sectional view showing a state in which the spacer 1 according to the present invention is fixed on the lower glass substrate 3 by the adhesive agent 2.

3 is a view illustrating a spacer manufacturing process of a touch panel for position coordinate input according to the present invention. In the first step (S1), a thermosetting adhesive is coated on a fine powder having a particle size of 4 to 20 μm to obtain pure water (water). ) Or a solution in which a ratio of pure water and powder is mixed in a ratio of 10: 1 to 10000: 1 to uniformly disperse the dispersion, and the second step (S2) is a bottom glass in which the transparent electrode is already formed with the dispersion in the first step. Controlling the number of spacers distributed per unit area by controlling the injection pressure of the injection nozzle within the range of 10 to 500 (Psi) on the substrate, and the third step (S3) is to dry the pure water or the solution after the second step. The step S4 is a step of performing heat treatment for 5 to 30 minutes at a temperature of 100 to 150 ° C. after the third step.

Here, the step of drying the pure water or the solution of the third step and the step of performing a heat treatment for 5 to 30 minutes at a temperature of 100 to 150 ° C. of the fourth step may be performed at the same time.

The operation of the spacer of the position coordinate input touch panel and the method of forming the same according to the present invention as described above will be described as follows.

Dust, adhesive (2) is usually selected as an epoxy or acrylic thermosetting resin and has a fluidity during heat treatment is coated on a fine powder (1) having a size of 4 ~ 20㎛ particle size, fine powder powder coated with an adhesive Is mixed with pure water or a solution at a constant mass ratio within the range of 10: 1 to 10000: 1 to make a dispersion, and then a constant pressure within the range of 10 to 500 (Psi) is applied on the lower glass substrate on which the transparent electrode is already formed. When spraying in the water, the number of distributions per unit area of the spacers 1 distributed on the lower glass substrate 3 can be controlled. After the pure water or the solution is dried, the temperature and the constant temperature within the range of 100 to 150 ° C and 5 to 30 are controlled. When the heat treatment is performed for a predetermined time within the range of minutes, the adhesive 2 coated and cured on the spacer 1 during the heat treatment will have adhesive strength and fluidity. Goyige beneath the spacer (1) as shown in (B), and when cooling after this heat treatment the spacer (1) is attached on the lower glass substrate 3 by the adhesive force of the adhesive (2) to be hardened again.

As the material of the spacer, silicon (SiO 2) is used a lot, but when the spacer is required to be elastic, plastics such as acrylic or Teflon or other insulating powder may be used.

As described above, according to the spacer of the touch panel for position coordinate input according to the present invention and a method of forming the same, a small spacer having a particle diameter of 15 micrometers or less is distributed at an unspecified position, but its size is relatively small and uniform, and the number of spacers per unit area. Since it can be controlled by the mixing ratio with the solution, the injection pressure and time during spraying, it is possible to form a fixed spacer and to improve the uniformity.

1 is a partial cross-sectional view of a touch panel showing a method of forming a spacer by a conventional thick film printing method

2 shows a spacer forming method according to the present invention.

(A) Sectional drawing with adhesive attached to spherical spacer

(B) is a sectional view of the spacer with adhesive attached to the glass substrate;

* Explanation of symbols for the main parts of the drawings

1 spacer (powder) 2 adhesive

3; Glass substrate

Claims (6)

In the touch panel for position coordinates in which a plurality of spherical spacers are formed on a glass substrate, A plurality of fine powders 1 are uniformly arranged on the glass substrate 3 while maintaining a predetermined distance from each other. Spacer input touch panel spacer, characterized in that the adhesive (2) is coated around the lower end of each of the powder (1) is attached on the glass substrate (3). The method of claim 1, The powder (1) is a spacer of the touch panel for position coordinates, characterized in that having a size of 4 ~ 20㎛ particle size. The method of claim 1, The powder (1) is a spacer of the touch panel for position coordinate input, characterized in that made of a silicon material. The method of claim 1, The powder (1) is a spacer of a touch panel for position coordinates, characterized in that made of a plastic material having an elasticity, such as acrylic, Teflon, or an insulating material. The spacer of claim 1, wherein the adhesive has a thermosetting property. A first step (S1) of dispersing a fine-sized powder coated with an adhesive with pure water or a liquid by mixing a mass ratio of pure water and powder in a range of 10: 1 to 10000: 1; A second step (S2) of spraying the dispersion liquid of the first step at a pressure of 10 to 500 psi on the lower glass substrate on which the transparent electrode is already formed; A third step (S3) of drying the pure water or the solution after the second step, And a fourth step (S4) of performing a heat treatment for 5 to 30 minutes at a temperature of 100 to 150 ° C. after the third step.