KR101617470B1 - ITO film structure and touch sreen - Google Patents

Abstract

The present invention relates to an ITO film structure and a touch screen.
That is, the ITO film structure of the present invention includes a film for a retarder; A hard coating layer coated on the retarder film, the hard coating layer having unevenness; And an ITO electrode pattern formed on the hard coating layer or the retarder film.

Description

ITO film structure and touch screen [0002]

The present invention relates to an ITO film structure and a touch screen.

2. Description of the Related Art [0002] In recent years, with the rapid development of multimedia technology and display technology, the resolution of a liquid crystal display part of a portable communication device has been improved, and a touch screen has been increasingly adopted in a portable communication device.

That is, mobile terminal devices such as a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), an MP3 player, and a mobile phone are becoming smaller in size to facilitate movement and portability.

Accordingly, a touch screen method has been employed in place of the conventional key button input method so that the user can more easily select and input information.

The touch screen method is a method of inputting or outputting information by directly interfacing with a computer through a screen. When a person's hand or an object touches a character or a specific position displayed on the screen, coordinates of the contacted position are grasped.

Then, specific processing such as an application corresponding to the coordinates is executed.

Therefore, the touch screen provides a function as an information display unit and a function as an input unit.

Such a touch screen or a touch window can be classified in various ways. Depending on its operation principle, the touch screen or the touch window can be roughly divided into a capacitive overlay, a resistive overlay, a surface acoustic wave, an infrared Beam).

The resistance film type touch screen is formed by coating a resistive material on a glass or transparent plastic plate and covering the polyester film with a resistive film on the glass or transparent plastic plate. And the voltage is also changed. The position of the hand which is touched by the change of the voltage is recognized.

The surface ultrasonic touch screen is equipped with a reflector that attaches a transmitter that emits a sound wave to one corner of the glass and reflects the sound wave at a regular interval, and a receiver (Reciever) When an object that interferes with a sound wave such as a finger interferes with the path of a sound wave, it calculates the point of time and recognizes the touch point.

In the infrared touch screen, a matrix is formed by disposing an infrared LED, which is a light emitting element, and a phototransistor, which is a light receiving element, facing each other in a way that utilizes the directivity of infrared rays that are invisible to a human eye. Detects the sensor to be blocked and recognizes the touch point.

The capacitive type touch screen is coated with a transparent conductive metal on both sides of the glass. When a voltage is applied to all four corners of the screen, high frequency is generated on the touch screen surface. The controller analyzes the high frequency waveform that changes during finger contact, .

The present invention solves the problem that the production yield can be improved and the scattered light can be reduced.

According to the present invention,

A film for a retarder;

A hard coating layer coated on the retarder film, the hard coating layer having unevenness;

An ITO film structure comprising an ITO electrode pattern formed on the hard coating layer or the retarder film is provided.

The retarder film is a COP (Cyclic Olefin Polymers) film or a COC (Cyclic Olefin Copolymer) film.

The coating layer may further include a coating layer formed on the hard coating layer and capable of preventing static electricity.

Further, the coating layer for static electricity prevention is formed along the shape of the unevenness.

In addition, the irregularities have a holographic pattern.

According to the present invention,

A lower retarder having an ITO electrode pattern formed thereon and having a concavo-convex surface, an upper retarder having an ITO electrode pattern formed thereon and adhered to the lower retarder and having a concavo-convex surface, A touch sensing unit including a linear polarizer;

And a touch panel including a display panel coupled to the touch sensing unit.

The upper retarder and the lower retarder may include a retarder film; A hard coating layer coated on the retarder film, the hard coating layer having a concavo-convex surface; And an ITO electrode pattern formed on the hard coating layer or the retarder film.

The retarder film is a 1 lambda / 4 plate.

In addition, the concavo-convex surface has a hologram pattern.

The present invention relates to a method for producing a retarder film, which can facilitate the unwinding of the retarder film in a rough roll formed in the hard coating layer of the retarder film, thereby reducing the tensile force of the retarder film, It is effective.

Further, according to the present invention, irregularities having a hologram pattern can be formed on the hard coating layer of the retarder film to reduce scattered light, thereby minimizing the sparkling phenomenon related to visibility.

In addition, there is an effect that the external light reflectance of the touch of the present invention can be reduced.

1 is a conceptual sectional view for explaining a structure of an ITO film according to a first embodiment of the present invention;
2 is a conceptual cross-sectional view for explaining another example of the ITO film structure according to the first embodiment of the present invention
3 is a conceptual cross-sectional view for explaining the ITO film structure according to the second embodiment of the present invention
4 is a conceptual drawing for explaining a process of manufacturing the ITO film structure according to the present invention
FIG. 5 is a photograph showing the structure of the ITO film according to the present invention
FIG. 6 is a photograph showing a surface shape of a hard coating layer of an ITO film structure according to the present invention,
7 is a schematic cross-sectional view of a touch screen according to the present invention
8 is a photograph showing a screen of the touch screen according to the present invention in a state in which external light is present

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a conceptual cross-sectional view illustrating a structure of an ITO film according to a first embodiment of the present invention. FIG. 2 is a conceptual cross-sectional view illustrating another example of the structure of an ITO film according to the first embodiment of the present invention 3 is a conceptual cross-sectional view illustrating an ITO film structure according to a second embodiment of the present invention.

As shown in FIG. 1, the ITO film structure according to the first embodiment of the present invention includes a film 100 for a retarder; A hard coating layer 110 coated on the retarder film 100 and having concavities and convexities 111 formed thereon; And an ITO electrode pattern 120 formed on the hard coating layer 110.

Here, the hard coating layer 110 is coated to increase the hardness of the retarder film 100.

In addition, the material of the hard coating layer 110 is preferably a polymer.

The retarder film 100 is applied to COP (Cyclic Olefin Polymers) film or COC (Cyclic Olefin Copolymer) film.

On the other hand, when the retarder film 100 is applied to a PET film, the polarizing function is deteriorated due to the influence of the phase change.

Therefore, the COP film or the COC film can minimize the influence on the phase change, so that the degradation of the polarization function can be prevented.

Therefore, the ITO film structure according to the first embodiment of the present invention has a structure in which the ITO electrode pattern 120 is formed on the hard coating layer 110 in which the concavities and convexities 111 are formed, As such, it plays a role in increasing the production yield.

In the ITO film structure according to the first embodiment of the present invention, as shown in FIG. 2, a coating layer 115 for preventing static electricity may be formed on the hard coating layer 110.

At this time, the static electricity prevention coating layer 115 may be formed along the shape of the irregularities 111 formed on the hard coating layer 110.

Therefore, the static electricity prevention coating layer 115 can remove or minimize the electrostatic force of the retarder film wound on the roll as described later, so that the rupture of the retarder film due to the tension that can be caused in the process of forming the ITO thin film Can be significantly reduced.

The ITO film structure according to the second embodiment of the present invention is similar to the ITO film structure in that the hard coat layer 110 on which the irregularities 111 are formed and the ITO electrode pattern 120 are formed on the retarder film 100 Structure.

That is, the hard coating layer 110 is formed on one surface of the retarder film 100, and the ITO electrode pattern 120 is formed on the other surface of the retarder film 100.

4 is a conceptual diagram for explaining a process of manufacturing the ITO film structure according to the present invention.

In order to manufacture the ITO film structure according to the present invention, the ITO thin film must be formed on the retarder film by a sputtering process.

At this time, as shown in FIG. 4, the retarder film 100 is unwound from the roll 210, sputtered, and then rolled to the roll 220.

When the retroreflective film 100 is unwound to perform a sputtering process while being wound on the roll 210 ', the retarder film 100 between the roll 210' and the roll 220 ' A tension is generated.

That is, since the retarder film 100 wound on the roll 210 is overlapped with each other, electrostatic force is generated due to the surface charge existing in the retarder film 100.

This electrostatic force acts as an adhesive force between the retarder film 100 wound on the roll 210, and tension is generated in the retarder film wound on the roll 210.

Here, when the retarder film 100 is used as a COP film, the COP film has a low tensile strength of about 60 MPa, so that the retarder film 100 is broken due to the tensile force to lower the yield .

In order to overcome such a problem, the present invention forms a hard coating layer 110 in which recesses and protrusions 111 are formed on the retarder film 100.

Therefore, since the hard coating layer 110 formed with the irregularities 111 is formed on the retarder film 100 wound on the roll 210, the retarder film 100 is prevented from being deformed by the irregularities 111, The detachment of the retarder film 100 is smoothly performed at 210 so that a low tension is generated in the region of the retarder film 100 between the roll 210 and the roll 220, And the yield can be improved.

The ITO thin film 121 is formed on the retarder film 100 by the sputtering process.

Then, when the ITO thin film 121 is patterned, the ITO electrode pattern 120 and the hard coating layer 110 formed on the hard coating layer 110 are formed like the ITO film structures of the first and second embodiments The ITO electrode pattern 120 may be formed on the back surface of the retarder film 100.

FIG. 5 is a photograph of an ITO film structure according to the present invention, and FIG. 6 is a photograph of a surface shape formed by a hologram method on a hard coating layer of an ITO film structure according to the present invention.

As described above, the irregularities formed in the hard coat layer are as shown in Fig. 5, and the adhesion between the retarder films wound on the rolls is reduced, thereby preventing the retarder film from being broken.

In the present invention, the irregularities formed on the hard coating layer can be formed by the hologram method.

In forming the concavities and convexities by the hologram method, the two light beams are interfered with each other to expose and develop the concavo-convex pattern with the light having the photonic crystal pattern, so that the irregularities formed as shown in the photograph of FIG. 6 have a hologram pattern.

Here, the irregularity having the hologram pattern can remove light scattering.

That is, in the touch screen to which the ITO film structure of the present invention is applied, the scattering due to the irregularities gives rise to a phase change, and an error is generated in the polarization state to be controlled by the polarizer and the retarder.

Such a phenomenon can maintain the polarization state by the polarizer and the retarder by making the unevenness have a holographic pattern as shown in Fig.

Therefore, the ITO film structure of the present invention is advantageous in that irregularities having a hologram pattern can be formed on the hard coat layer of the retarder film to reduce scattered light, thereby minimizing sparkling related to visibility.

FIG. 7 is a schematic cross-sectional view of a touch screen according to the present invention, and FIG. 8 is a photograph of a screen of a touch screen according to the present invention in the presence of external light.

The touch screen of the present invention includes a lower retarder 310 having an ITO electrode pattern 313 and having a concavo-convex surface; An upper retarder 320 adhered to the lower retarder 310 and having an ITO electrode pattern 323 and having an uneven surface; A touch sensing unit including a linear polarizer 350 bonded to the upper retarder 320; And a display panel 300 coupled to the touch sensing unit.

Here, each of the lower retarder 310 and the upper retarder 320 is preferably a 1λ / 4 plate, and a 1λ / 2 plate and a 3λ / 4 plate are also applicable.

A transparent substrate may be bonded to the linear polarizer 350.

Therefore, the touch sensing unit is provided with an adhesive 330 'for bonding the upper retarder 320 and the lower retarder 310, and the upper retarder 320 and the linear polarizer 350 are bonded to each other An adhesive '351' is provided.

When an electrostatic force is generated by the touch of the user with the linear polarizer 350, the touch screen may include an ITO electrode pattern 323 formed on the upper retarder 320 corresponding to the touch region, The capacitance value is changed in the formed ITO electrode pattern 313 and the coordinate value of the touch area is detected by the changed capacitance value.

Hereinafter, the traveling path of the light on the touch screen will be described assuming that the upper retarder 320 and the lower retarder 310 are 1? / 4 plates.

First, when external light is incident on the touch screen, the external light passes through the linear polarizer 350 and is converted into a clockwise circular polarized light by the upper retarder 320.

When the circularly polarized light in the clockwise direction is reflected, the polarized light is changed to a linearly polarized state by the upper retarder 320, and the linearly polarized light is orthogonal to the linearly polarized light 350 So that the light can not escape to the outside.

The light emitted from the display panel 300 is converted into circularly polarized light in the clockwise direction in the lower retarder 310 and converted into linearly polarized light while passing through the upper retarder 320.

Since the linear polarized light passed through the upper retarder 320 is parallel to the polarization axis of the linear polarizer 350, the light emitted from the display panel 300 can be emitted to the outside without loss.

As a result, the touch screen of the present invention can improve the visibility of the screen even in the presence of external light, as shown in FIG. 8, so that the external light reflectance can be reduced.

Meanwhile, in the method of manufacturing a touch screen according to the present invention, an ITO electrode pattern 313 is formed, a lower retarder 310 having an irregular surface and an ITO electrode pattern 323 are formed, Bonding the retarder (320); Attaching a linear polarizer (350) to the upper retarder (320); And fastening the display panel 300 to the lower retarder 310.

Here, the upper retarder 320 and the lower retarder 310 may be formed by unwinding a retarder film having a roughened surface on a roll, forming an ITO thin film on the unwound retarder film, And patterning the ITO electrode pattern to form an ITO electrode pattern.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

A film for a retarder;
A hard coating layer coated on the retarder film, the hard coating layer having unevenness;
An ITO electrode pattern formed on the hard coating layer or the retarder film;
And an antistatic coating layer formed on the hard coating layer and capable of preventing static electricity.
The method according to claim 1,
In the retarder film,
An ITO film structure which is a COP (Cyclic Olefin Polymers) film or a COC (Cyclic Olefin Copolymer) film.
delete The method according to claim 1,
Wherein the electrostatic protection coating layer comprises:
An ITO film structure formed along the shape of the unevenness.
The method according to claim 1,
The concavo-
ITO film structure with holographic pattern.
A lower retarder having an ITO electrode pattern formed thereon and having a concavo-convex surface, an upper retarder having an ITO electrode pattern adhered to the lower retarder and having a concave-convex surface, a linear polarizer attached to the upper retarder, A touch sensing unit including a linear polarizer;
And a display panel coupled to the touch sensing unit.
The method of claim 6,
Wherein the upper retarder and the lower retarder are made of a single-
A retarder film;
A hard coating layer coated on the retarder film, the hard coating layer having unevenness;
And an ITO electrode pattern formed on the hard coating layer or the retarder film.
The method of claim 7,
In the retarder film,
Touch screen with 1λ / 4 plate.
The method of claim 7,
The concavo-
Touch screen with hologram pattern.

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