KR101084859B1 - touch screen - Google Patents

Abstract

The present invention relates to a touch screen, wherein two transparent substrates having a transparent conductive film formed on one surface thereof, an electrode formed on the transparent substrate and electrically connected to the transparent conductive film, and formed between the transparent conductive film and the transparent substrate on which the electrode is formed. And a piezoelectric body formed inside the adhesive layer and providing vibration to the user. The piezoelectric body is installed inside the adhesive layer between the transparent substrates to realize thinner and smaller portable devices, and a user feels a touch. It provides a touch screen that enhances the feeling.

Description

Touch Screen {Touch Screen}

The present invention relates to a touch screen.

As electronic technology continues to develop, personal computers, portable transmission devices, and the like perform text and graphic processing using various input devices such as a keyboard, a mouse, and a digitizer. However, these input devices have been developed in accordance with the expansion of the use of personal computers, and there is a problem in that they are applied to portable devices which are recently miniaturized and thinned. Accordingly, a touch screen is emerging as an input means suitable for a portable device.

A touch screen is generally installed in a display device and used to select information desired by a user. The touch screen is a resistive type, a capacitive type, an electro-magnetic type, or a method. (Saw Type) and Infrared Type.

Touch screen has various advantages such as simple, less misoperation, space saving, and easy interoperability with IT devices. Because of these advantages, they are widely used in various fields such as industry, transportation, service, medical care, and mobile.

On the other hand, with the development of the touch screen, research is being actively conducted on devices that provide haptic feedback to improve the user's sense of touch. In general, the haptic feedback generates the vibration in the touch screen by an ERM (Eccentric Rotating Mass) motor or an electromagnetic motor, in which the center of gravity of the rotor is eccentrically formed in one direction and the vibration is generated by rotational imbalance during rotation. Implemented in a way that is passed to.

In addition, in recent years, a piezoelectric actuator (Piezo Actuator) using a piezoelectric phenomenon in order to generate haptic feedback in addition to the method using a motor has been in progress. A piezoelectric actuator means an actuator which drives using the piezoelectric phenomenon of a piezoelectric body. When pressure is applied to crystals such as quartz or rosell salt, voltage is generated, which is called the piezoelectric direct effect. On the contrary, a phenomenon in which crystals deform when a voltage is applied is called a piezoelectric adverse effect. By using such a piezoelectric adverse effect, the piezoelectric actuator can generate vibrations, and can operate with a large torque, a small size, and a small driving power, compared to a conventional motor.

1 is a cross-sectional view of a touch screen module 10 having a piezoelectric actuator according to the prior art. Hereinafter, referring to this, a touch screen module 10 having a conventional piezoelectric actuator will be described.

As shown in FIG. 1, the piezoelectric actuator 40 is formed between the touch screen 20 and the display 30. At this time, in order to fix the piezoelectric actuator 40, a separate plate (not shown) or an adhesive layer (not shown) is used.

However, the touch screen module 10 having the piezoelectric actuator according to the prior art had to make a space in which the piezoelectric actuator 40 is formed in the portable device separately, and thus, the problem of increasing the thickness and size of the portable device is large. there was.

In addition, the distance between the upper surface of the touch screen 20 and the piezoelectric actuator 40, which is the point where the user touches, has a problem that the touch feeling is not sufficiently transmitted to the user.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a touch screen that realizes thinning and miniaturization of a portable device by minimizing an installation space of a piezoelectric actuator.

In addition, another object of the present invention is to provide a touch screen to install a piezoelectric actuator close to the point where the user touches, to improve the touch feeling the user feels.

According to a preferred embodiment of the present invention, a touch screen includes two transparent substrates having a transparent conductive film formed on one surface thereof, an electrode formed on the transparent substrate and electrically connected to the transparent conductive film, the transparent conductive film and the transparent substrate having the electrode formed thereon. It is characterized in that it comprises an adhesive layer formed between the liver, and a piezoelectric body formed inside the adhesive layer to provide vibration to the user.

Here, the adhesive layer is a double-sided adhesive tape formed between the outside of the transparent substrate, it is characterized in that the insulating film type is formed between the insulating spacer between the inside of the transparent substrate.

In addition, the adhesive layer is an optical transparent adhesive formed between the entire surface of the transparent substrate, the piezoelectric is characterized in that the capacitive type formed on the outside of the adhesive layer.

The piezoelectric body may be formed on four sides of the transparent substrate.

In addition, the piezoelectric body is formed on two opposite sides of the transparent substrate.

In addition, the piezoelectric body is formed at four vertices of the outer side of the transparent substrate.

In addition, the piezoelectric body may be formed at two vertices in a diagonal direction outside the transparent substrate.

In addition, the piezoelectric body may include a piezoelectric layer and electrode layers formed on both surfaces of the piezoelectric layer and transferring voltage to the piezoelectric layer.

In addition, the piezoelectric layer is composed of PZT, PLZT, BZT-BCT, or PVDF, the electrode layer is characterized in that composed of silver.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of a term in order to best describe its invention The present invention should be construed in accordance with the spirit and scope of the present invention.

Touch screen according to the present invention, by installing a piezoelectric material between the transparent substrate, does not require a separate piezoelectric installation space, there is an advantage to implement a thinner and smaller size portable device.

In addition, according to the present invention, the piezoelectric body is installed at a position close to the first transparent substrate, which is a point touched by the user, thereby improving the touch feeling and the operation feeling felt by the user.

In addition, according to the present invention, there is an advantage of providing a three-dimensional touch to the user by installing a piezoelectric member on opposite sides or vertices of the outer side of the transparent substrate.

1 is a cross-sectional view of a touch screen module having a piezoelectric actuator according to the prior art.
2 is a cross-sectional view of a touch screen according to a first embodiment of the present invention.
3A to 3D are diagrams for describing an arrangement of piezoelectric elements formed on the touch screen shown in FIG. 2.
4 is a cross-sectional view of a touch screen according to a second preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, terms such as first and second 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. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

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

First Example  - Resistance film  Touch screen

2 is a cross-sectional view of the touch screen 100a according to the first preferred embodiment of the present invention, and FIGS. 3A to 3D illustrate the arrangement of the piezoelectric body 150 formed on the touch screen 100a of FIG. 2. It is for the drawing. Hereinafter, the touch screen 100a according to the present embodiment will be described with reference to this. In the present embodiment, a case in which the touch screen 100a is a resistive film is described.

As shown in FIG. 2, the touch screen 100a according to the present embodiment includes a transparent substrate 110, a transparent conductive film 120, an electrode 140, an adhesive layer 130a, and a piezoelectric body 150.

The transparent substrate 110 is composed of two sheets, the first transparent substrate 111 and the second transparent substrate 112.

Here, the first transparent substrate 111 is a member that receives pressure from a user's body or a specific object such as a stylus pen, and the first transparent conductive film 121 is formed on one surface thereof. Since the first transparent substrate 111 is bent by receiving an input, it is preferable that the first transparent substrate 111 is made of a material having elasticity so that the first transparent substrate 111 can be returned to its original position when the input is released. For example, the first transparent substrate 111 is a transparent and elastic material, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), poly It may be composed of ethersulfone (PES) or cyclic olefin polymer (COC). In addition, glass or tempered glass which is generally used may be used. Meanwhile, a separate window plate (not shown) is formed on the first transparent substrate 111 to protect the touch screen 100a.

The second transparent substrate 112 is a member positioned at the bottom of the touch screen 100a and has a second transparent conductive film 122 formed on one surface thereof. The second transparent substrate 112 may be made of a transparent material in the same manner as the first transparent substrate 111, the other surface of the second transparent substrate 112, for example, a liquid crystal display (LCD) A display (not shown) such as a plasma display panel (PDP) or an electroluminescense (EL) may be combined. In this case, the second transparent substrate 112 and the display (not shown) may be combined with, for example, a double-sided adhesive tape (DAT) or an optical transparent adhesive (OCA).

On the other hand, the transparent substrate 110 is formed with a transparent conductive film 120, it is preferable to perform a high frequency treatment or a primer (Primer) treatment in order to improve the adhesion with the transparent conductive film 120.

The transparent conductive film 120 is a member formed on the transparent substrate 110 to recognize a signal received from the first transparent substrate 111.

Here, the transparent conductive film 120 may be composed of the first transparent conductive film 121 and the second transparent conductive film 122, the first transparent conductive film 121 is the first transparent substrate 111, the second transparent conductive film ( 122 may be formed on the second transparent substrate 112 to face each other. The first transparent conductive layer 121 is in contact with the second transparent conductive layer 122 due to the pressure applied to the transparent substrate 110 to generate a change in voltage, and based on this, the control unit (not shown) can recognize the pushed coordinates. In addition, the controller (not shown) may implement a desired operation by recognizing the coordinates of the pressed position.

In addition, the first transparent conductive film 121 and the second transparent conductive film 122 may be formed in a bar shape orthogonal to each other so as to recognize the X-axis coordinates and the Y-axis coordinates, respectively. However, the present invention is not limited thereto and may be configured in various shapes such as a rhombus, a hexagon, an octagon, and a triangle.

On the other hand, the transparent conductive film 120 is composed of a transparent material, so that the user can see the lower display, it is preferable that the conductive material. For example, the transparent conductive film 120 may be formed of a metal oxide such as indium tin oxide (ITO), or poly-3, 4-ethylenedioxythiophene / polystyrenesulfonate (PEDOT / PSS), polyaniline, or the like. It may be composed of a conductive polymer alone or mixed. In this case, when the transparent conductive film 120 is made of a metal oxide, it can be coated on the transparent substrate 110 through deposition, development, etching, etc., and if it is made of a conductive polymer, silkscreen printing, inkjet printing, gravure printing, It may be formed on the transparent substrate 110 through the offset printing method.

The adhesive layer 130a is formed on the outer side between the transparent substrates 110 on which the transparent conductive film 120 is formed, and the spacer 132 is a member formed on the inner side between the transparent substrates 110.

Here, the adhesive layer 130a may be formed of, for example, a double-sided adhesive tape (DAT) to bond the first transparent substrate 111 and the second transparent substrate 112 to each other. Since the adhesive layer 130a is formed between the outside of the transparent substrate 110 so that the first transparent conductive film 121 and the second transparent conductive film 122 may be contacted by external pressure, an opening 131 may be formed inside. have.

In this case, a spacer 132 may be formed between the inner sides of the transparent substrate 110. The spacer 132 may be configured in the form of a dot spacer. The spacer 132 may relieve an impact when the first transparent conductive layer 121 and the second transparent conductive layer 122 contact each other, and may release the first spacer when the pressure is released. It provides a repulsive force so that the transparent substrate 111 can be returned to its original position. In addition, in order to prevent contact between the first transparent conductive layer 121 and the second transparent conductive layer 122 even when there is no external pressure, the insulating layer 120 maintains insulation between the transparent conductive layers 120.

The electrode 140 is a member electrically connected to the transparent conductive film 120 to supply a voltage to the transparent conductive film 120.

Here, the electrode 140 may be made of a material having excellent electrical conductivity so as to supply a voltage to the transparent conductive film 120 and to transmit a voltage change recognized by the transparent conductive film 120 to a controller (not shown). For example, the electrode 140 may be formed of a silver paste or a material composed of organic silver. In addition, the electrode 140 is formed on the outside of the transparent substrate 110, and does not necessarily need to be made of a transparent material.

The piezoelectric member 150 is a member formed inside the adhesive layer 130a and provides a vibration feeling to the user.

Here, the piezoelectric body 150 may be composed of the piezoelectric layer 151 and the electrode layer 152 formed on both surfaces of the piezoelectric layer 151. The piezoelectric layer 151 may include, for example, lead zirconate titanate (PZT), lanthanum-doped lead zirconate titanate (PLZT), barium zirconate titanate-barium calcium titanate (BZT-BCT), or polyvinylidene fluoride (pvdf). The piezoelectric material may be formed of a piezoelectric material such as, and the electrode layer 152 may be formed of an electrically conductive metal such as silver (Ag).

In addition, the electrode layer 152 receives a voltage from the outside and transfers it to the piezoelectric layer 151. In this case, the piezoelectric layer 151 is applied with a voltage to expand and contract vertically or horizontally by a polarization phenomenon to generate vibration, and the vibration may be transmitted to the user. Meanwhile, although FIG. 2 illustrates a piezoelectric body 150 formed of one layer of piezoelectric layer 151, this is merely an example. In order to maximize the vibration force, the piezoelectric layer 151 is formed in a multi-layer, and a plurality of piezoelectric layers ( It is also possible to form an internal electrode layer between the 151s.

On the other hand, the piezoelectric body 150 is formed inside the adhesive layer 130a formed between the outside of the transparent substrate 110. Since the thickness of the adhesive layer 130a is generally about 100 μm, the piezoelectric body 150 is preferably in the form of a thin film of 100 μm or less.

Since the piezoelectric body 150 is formed inside the adhesive layer 130a between the transparent substrates 110, the piezoelectric body 150 is accommodated in the existing space to efficiently use the space, thereby making the touch screen module thinner and thinner. It is possible to make small. In addition, since the piezoelectric member 150 is installed near the first transparent substrate 111, which is a part input by the user, a touch or an operation feeling may be improved.

3A to 3D, the piezoelectric member 150 may be formed in various combinations between the outside of the transparent substrate 110.

For example, as illustrated in FIG. 3A, the piezoelectric body 150 may be formed on all four sides between the outer sides of the transparent substrate 110, or as shown in FIG. 3B, on two opposite sides. In addition, as illustrated in FIG. 3C, the piezoelectric body 150 may be formed at all four vertices between the outer sides of the transparent substrate 110 or at two opposite vertices as shown in FIG. 3D. In particular, when the piezoelectric body 150 is formed on four sides or all four vertices, the vibration can be applied to the user in various directions, and thus, it is possible to provide the user with three-dimensional haptic feedback.

In addition, a control unit (not shown) may be configured to give the user a sense of position so that the piezoelectric member 150 in a direction close to the point touched by the user may vibrate.

2nd Example  -Capacitive touch screen

4 is a cross-sectional view of the touch screen 100b according to the second embodiment of the present invention. Hereinafter, the touch screen 100b according to the present embodiment will be described with reference to this. In this embodiment, a case in which the touch screen 100b is a capacitive method will be described.

As shown in FIG. 4, the touch screen 100b according to the present embodiment includes a transparent substrate 110, a transparent conductive film 120, an electrode 140, an adhesive layer 130b, and a piezoelectric body 150. The contents of the transparent substrate 110 and the electrode 140 are the same as in the first embodiment and will be omitted below.

The transparent conductive film 120 is composed of the first transparent conductive film 121 and the second transparent conductive film 122, and is formed on the first transparent substrate 111 and the second transparent substrate 112, respectively.

Here, the touch screen 100b of the present embodiment is a capacitive type, and the first transparent conductive film 121 and the second transparent conductive film 122 detect a change in capacitance value when a body or the like comes in contact with the controller (not shown). ), And the controller (not shown) may convert the value into a digital signal to recognize the coordinates of the pressed position.

The adhesive layer 130b is a member for bonding the first transparent substrate 111 and the second transparent substrate 112 to each other.

Here, the adhesive layer 130b may be formed on the entire surface between the transparent substrates 110, and may serve to electrically insulate the first transparent conductive layer 121 and the second transparent conductive layer 122. In addition, the adhesive layer 130b is formed on the front surface of the transparent substrate 110 and should be transparent so that the display can be seen. For example, the adhesive layer 130b may be formed of an optical clear adhesive (OCA). have.

On the other hand, since the adhesive layer 130b is formed on the entire surface of the transparent substrate 110, unlike the first embodiment, a separate spacer may not be necessary.

The piezoelectric material 150 may be formed on the outer side of the inner region of the adhesive layer 130b.

Here, since the inner portion of the adhesive layer 130b should be transparent as a portion for the user to see the display, the piezoelectric member 150 is formed on the outer portion of the inside of the adhesive layer 130b. On the other hand, as in the case of the first embodiment, the piezoelectric member 150 is formed in a region close to the touch point of the user to improve the operation feeling, and configure the piezoelectric body 150 to provide a three-dimensional touch feeling to the user.

Although the present invention has been described in detail through specific embodiments, this is for explaining the present invention in detail, and the touch screen according to the present invention is not limited thereto, and having ordinary knowledge in the art within the technical spirit of the present invention. It will be clear that modifications and improvements are possible by the person.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

110: transparent substrate 111: first transparent substrate
112: second transparent substrate 120: transparent conductive film
121: first transparent conductive film 122: second transparent conductive film
130a, 130b: adhesive layer 131: opening
132 spacer 140 electrode
150: piezoelectric 151: piezoelectric layer
152: electrode layer

Claims (9)

Two transparent substrates on one surface of which a transparent conductive film recognizing an input signal;
An electrode formed on the transparent substrate and electrically connected to the transparent conductive film;
An adhesive layer formed between the transparent conductive film and the transparent substrate on which the electrode is formed; And
A piezoelectric body formed inside the adhesive layer to provide vibration to a user;
Including,
The adhesive layer is a double-sided adhesive tape formed between the outer side of the transparent substrate, the touch screen, characterized in that the resistive type of the insulating spacer is formed between the inner side of the transparent substrate. delete Two transparent substrates on one surface of which a transparent conductive film recognizing an input signal;
An electrode formed on the transparent substrate and electrically connected to the transparent conductive film;
An adhesive layer formed between the transparent conductive film and the transparent substrate on which the electrode is formed; And
A piezoelectric body formed inside the adhesive layer to provide vibration to a user;
Including,
The adhesive layer is an optical transparent adhesive formed between the front surface of the transparent substrate, the piezoelectric touch screen, characterized in that the capacitive type formed on the outside of the inside of the adhesive layer. The method according to claim 1 or 3,
And the piezoelectric body is formed on four sides of the outer side of the transparent substrate. The method according to claim 1 or 3,
And the piezoelectric body is formed on two opposite sides of the outer side of the transparent substrate. The method according to claim 1 or 3,
And the piezoelectric body is formed at four vertices of the outer side of the transparent substrate. The method according to claim 1 or 3,
And the piezoelectric body is formed at two vertices of a diagonal direction outside the transparent substrate. The method according to claim 1 or 3,
The piezoelectric body,
Piezoelectric layer; And
Electrode layers formed on both surfaces of the piezoelectric layer and transferring voltage to the piezoelectric layer;
Touch screen comprising a. The method according to claim 8,
The piezoelectric layer is PZT, PLZT, BZT-BCT, or PVDF, the electrode layer is a touch screen, characterized in that composed of silver.

Images