KR100858331B1

KR100858331B1 - Input apparatus for one body type touch screen comprising window

Info

Publication number: KR100858331B1
Application number: KR1020070090874A
Authority: KR
Inventors: 권기덕
Original assignee: 주식회사 이투아이기술
Priority date: 2007-09-07
Filing date: 2007-09-07
Publication date: 2008-09-11

Abstract

A touch screen input device functioning as a window in one body is provided to reduce the number of processes for manufacturing touch screens and its cost via simplification of product structure. A touch screen input device functioning as a window in one body includes a plastic base plate(150), a lower ITO(Indium Tin Oxide) film(140), an upper ITO film(110) and spacers(160). The plastic base plate forms a touch screen. The lower ITO film adhered to the plastic base plate with adhesive has a preset resistance value and a rectangular shape along an upper edge, and forms voltage supplying electrodes which have plural different equipotential lines in the X and the Y coordinate. The upper ITO film, positioned over the lower ITO film, forms a signal sensing electrode. The spacers are equidistantly arranged in the lower ITO film.

Description

Input apparatus for one body type touch screen comprising window}

The present invention relates to a window-integrated touch screen input device. In particular, by applying a 5-wire resistive touch screen having high durability by constructing a voltage applying electrode to have a linearized voltage distribution, the touch screen structure can be simplified and improved reliability. It relates to a window-integrated touch screen input device suitable for the following.

In general, a touch screen refers to a screen equipped with a special input device that receives a position when touched by hand. In other words, when a person's hand or an object touches a character or a specific location on the screen (screen) without using a keyboard, the input data can be directly received from the screen so that the location can be determined and processed by the stored software. Speak the screen that made it possible.

These touch screens function by attaching a device called a touch panel to a screen of a general monitor, and the touch panel causes numerous rectangular grids to form on the screen by allowing invisible infrared light to flow from side to side and up and down. When contacted with a grid or other object, it has a function to determine its position.

Therefore, if you touch the text or picture information displayed in advance on the screen equipped with the touch panel by hand, it is easy to find out what the user has selected according to the location of the touched screen and to process the corresponding command by computer. You can get the information you want.

Due to this characteristic of the touch screen, it is widely used for guidance software in places that are widely used by the public, that is, subways, department stores, banks, and the like, and is not only applied to sales terminals in various stores but also for general business purposes.

1 is a cross-sectional view showing an application example of a conventional touch screen, Figure 2 is a cross-sectional view showing another application example of a conventional touch screen.

Here, reference numeral 10 is a touch screen, 20 is a display of a device on which the touch screen is mounted, and 30 is a front case for protecting the touch screen 10 and the display 20.

3 is a cross-sectional view showing the structure of a conventional touch screen.

Wherein reference numeral 11 is a hard coat film, 12 is an adhesive, 13 is a decorative film, and 14 is a decorative printed layer. In addition, reference numeral 15 is an upper indium tin oxide (ITO) film, 16 is a lower ITO film, 17 is a plastic substrate, 18 is a spacer, and shows a configuration example of a 4-wire resistive touch screen.

Thus, the upper ITO film 15, which is placed on the upper side and becomes the movable electrode plate, and the lower ITO film 16, which is placed on the lower side, is fixed by the adhesive 12 having a thickness of about 50 to 300 µm. The upper ITO film 15 is in contact with the lower ITO film 16 under pressure to be pressed by a finger or a pen when inputting.

The upper ITO film 15 may use a stretchable PET film or thin glass as its material. Since thin glass is optically isotropic in order to reduce surface reflection by attaching a polarizing plate thereon, a plastic film having optical isotropy has recently been commercialized. However, there is much room for improvement in terms of cost, difficulty in processing, and physical properties.

4 is a conceptual diagram illustrating a driving method of a conventional touch screen.

Reference numeral 15-1 denotes a voltage applying electrode formed on the upper ITO film 15, and 16-1 denotes a voltage applying electrode formed on the lower ITO film 16.

Therefore, the upper ITO film 15 and the lower ITO film 16 are sandwiched between the spacers 18 so as to face each other at an interval of 50 to 300 µm, and the input signal is extracted by the connector tail. When a voltage Vx is applied to the voltage applying electrode 16-1 of the lower ITO film 16, a potential gradient occurs on the resistance surface between the voltage applying electrodes 16-1 of the lower ITO film 16. This voltage is read from the voltage applying electrode 15-1 of the upper ITO film 15 and calculated by calculating the input position of the X axis through the controller.

Then, the voltage Vy is applied between the voltage applying electrodes 15-1 of the upper ITO film 15, the voltage is read from the voltage applying electrode 16-1 of the lower ITO film 16, and the position of the Y axis is calculated. Is displayed on the display 20. By repeating this at high speed, it is possible to continuously display the input position on the display 20 and draw characters and lines.

In order to satisfy various characteristics required for the touch screen, the wiring of the electrode applied to the analog detection method in the resistive film method is changed into a 4-wire, 5-wire, or 8-wire type.

Although 4-wire is simple to manufacture, the damage of conductive film damage is large, 5-wire is difficult to manufacture compared to 4-wire, but normal operation is possible regardless of film quality uniformity or damage, and 8-wire is compared to 4-wire or 5-wire Although difficult to manufacture, the wire itself has advantages and disadvantages, such as excellent environmental resistance to temperature and humidity.

5 is a cross-sectional view showing an example of the configuration of the potential compensation electrode in the conventional 5-wire resistive film method.

5 is a 5-wire resistive film method, which is a touch screen using an analog method as a detection method.

In the 5-wire resistive touch screen, X and Y-axis potential compensation electrodes (Sheet Resistance) 19-1 to 19-4 are formed on the upper ITO film 15 or the lower ITO film 15. Thus, the potential compensation electrodes 19-1 to 19-4 are formed along the four sides of the lower substrates 15 and 16, respectively.

At this time, the transparent conductive film, which is already bonded as much as the corresponding area provided to install the signal application wirings 19-1 to 19-4 to the position terminals A to D, is removed or an insulating film is formed on the transparent conductive film.

In addition, unlike the 4-wire resistive film method, the 5-wire resistive film method must satisfy the X and Y-axis position signal application functions on the lower substrates 15 and 16 at the same time, as shown in FIG. 5. 19-4) are separated and formed on the lower substrates 15 and 16. Therefore, the resistance component between the potential compensation electrodes 19-1 to 19-4 is the ratio of the gap between the potential compensation electrodes 19-1 to 19-4 and the potential compensation electrode and the length of the adjacent electrode surface. Mostly determined by. This design is designed to control the resistance value between the potential compensation electrodes 19-1 to 19-4. If the resistance value is too low, the resistance value of the entire touch screen is lowered, which may seriously affect the configuration and power consumption of the driving circuit. To design.

In particular, the design of the potential compensation electrodes 19-1 and 1-3 for position signal application for recognizing the Y-axis coordinates, as shown in Fig. 5, applies VH to the D and C terminals and grounds or VL to the B and A terminals. When is applied, the resistance value between the compensation electrodes in the X-axis direction is selected and designed so that the equipotential distribution is distributed perpendicular to the Y-axis direction. In addition, the design of the potential compensation electrodes 19-2 and 19-4 for position signal application to recognize the X-axis coordinates is configured correspondingly.

However, such a prior art has a very complicated structure of the window-integrated touch screen by using a conventional resistive touch screen. That is, in the case of the 5-wire type, the structures of the potential compensation electrodes 19-1 to 19-4 become very complex as shown in FIG. 5. These complex structures are inevitable due to the increase in the number of materials and processes required. On the other hand, conventional resistive touch screens are difficult to guarantee high durability (lifespan) in principle and in particular, there is a problem that a special structure of ITO film must be used to obtain proper durability.

In addition, the conventional touch screen has a problem that it is difficult to minimize the area of the edge to print a complex shape to form a uniform dislocation.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to configure a voltage applying electrode to have a linearized voltage distribution by applying a 5-wire resistive touch screen having high durability. The present invention provides a window integrated touch screen input device capable of simplifying a touch screen structure and improving reliability.

6 is a cross-sectional view illustrating a structure of a window integrated touch screen input device according to an embodiment of the present invention. FIG. 7 is a conceptual view illustrating an example in which a signal sensing electrode and a voltage applying electrode are coupled to an ITO electrode in FIG. 6. 8 is a conceptual diagram illustrating an example of a voltage applying electrode and a wiring electrode in FIG. 7.

As shown therein, the plastic substrate 150 forming the touch screen; A lower ITO film 140 attached to the plastic substrate 150 by an adhesive 130 and having a predetermined resistance value and a voltage applying electrode 180 formed in a straight line shape; An upper ITO film 110 positioned on the lower ITO film 140 and on which a signal sensing electrode 170 is formed; And a spacer 160 disposed at regular intervals on the lower ITO film 130.

The voltage applying electrode 180 is formed in a curved form according to the equipotential lines appearing instead of the straight form.

The window integrated touch screen input device may further include a decorative printing layer 120 attached to the upper ITO film 110 and adhered to the lower ITO film 140 by an adhesive 130. It is done.

The voltage applying electrode 180 is a curve formed by the resistance value of the voltage applying electrode 180 such that the resistance value is determined by adjusting a ratio with the sheet resistance (Ω / □) of the lower ITO film 140. It is characterized in that the equipotential line is to be straightened.

The voltage applying electrode 180 is characterized in that the resistance value is between 50 Ohm and 150 Ohm.

In addition, the window-integrated touch screen input device according to another embodiment of the present invention, in the touch screen input device including the upper ITO film 110 and the lower ITO film 140, on the lower ITO film 140 A voltage application electrode 180 formed in a straight line shape having a predetermined resistance value; A signal sensing electrode 170 formed under the one side of the upper ITO film 110 and sensing a signal of the voltage applying electrode 180 generated when the touch screen input device is touched It is characterized by.

The window integrated touch screen input device may further include a voltage applying wiring electrode 190 wired in four lines so that a voltage is applied to the voltage applying electrode 180.

The window integrated touch screen input device according to the present invention can achieve a simplified touch screen structure and improved reliability by applying a 5-wire resistive touch screen having high durability by constructing a voltage applying electrode to have a linearized voltage distribution. It will work.

Therefore, the present invention can reduce the number of manufacturing process and cost of the touch screen through the simplification of the product structure.

A preferred embodiment of the window-integrated touch screen input device according to the present invention configured as described above will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or precedent of a user or an operator, and thus, the meaning of each term should be interpreted based on the contents throughout the present specification. will be.

First, the present invention is to achieve a simplified and improved reliability of the touch screen structure by applying a 5-wire resistive touch screen having a high durability characteristics by configuring a voltage applying electrode to have a linearized voltage distribution.

To this end, the present invention detects the voltage applied to the lower ITO film 140 or the glass and the applied voltage with a voltage applied electrode 180 having a predetermined resistance value and a spacer 160 arranged at a predetermined interval at a predetermined size when the applied voltage. The upper ITO film 110 and the double-sided tape or adhesive 130 to be adhered to the edge of the upper ITO film 110 and the lower ITO film 140 with a predetermined thickness and width.

In addition, the window-integrated touch screen to which the touch screen of the present invention is applied forms a signal sensing electrode 160 printed with a predetermined shape inside the upper ITO film 110.

In addition, the resistance value of the line of the voltage applying electrode 180 is 50 ohm to 150 ohm in the touch screen, and the voltage applying electrode 180 is configured in a straight line shape. In addition, the shape of the voltage applying electrode 180 may be formed in a curved shape according to the equipotential line that appears, instead of a straight shape.

6 is a cross-sectional view illustrating a structure of a window integrated touch screen input device according to an embodiment of the present invention.

Therefore, the resistance value is determined by adjusting the ratio of the voltage applying electrode 180 to the sheet resistance (Ω / □) of the lower ITO film 140 so that the equipotential line of the curve formed by the resistance value of the voltage applying electrode 180 is By making this linearization, the decorative printing layer 120 can be located under the upper ITO film 110, thereby simplifying the touch screen structure.

That is, in the conventional configuration as shown in FIG. 2, when the upper ITO film 15 is damaged, the voltage applying electrode 19 formed on the upper ITO film 15 is also damaged and thus an error of the touch screen is prevented. In order to do so, the hard coating film 11 had to be formed on the decorative film 13 on which the decorative printing layer 14 was formed. As a result, the thickness of the touch screen becomes thick, durability decreases, and cost increases.

However, in the present invention, even when a portion of the upper ITO film 110 is damaged by simplifying the structure of the voltage applying electrode 180, the possibility of damage to the signal sensing electrode 170 formed on one side of the upper ITO film 110 is lowered. Highly durable touch screens can be realized.

FIG. 7 is a conceptual diagram illustrating an example in which a signal sensing electrode and a voltage applying electrode are coupled to an ITO electrode in FIG. 6, and FIG. 8 is a conceptual diagram illustrating an example of a voltage applying electrode and a wiring electrode in FIG. 7.

The voltage applying electrode 180 has a rectangular shape along the upper edge of the lower ITO film 140. Alternatively, the voltage applying electrode 180 may be formed in a curved shape according to the equipotential lines that appear instead of the rectangular shape.

In the related art, since the equipotential lines formed by the voltage applying electrodes have a curved shape, the structure of the potential compensation electrodes 19-1 to 19-4 has a complicated shape to straighten them.

However, in the present invention, the resistance value of the voltage applying electrode 180 is determined by adjusting the ratio with the sheet resistance (Ω / □) of the lower ITO film 140 so that the equipotential lines can be straightened, thereby simplifying the touch screen structure. Done.

9A to 9E are conceptual views for explaining the configuration of the voltage applying electrode in FIG.

First, in FIG. 9A, the voltage applying electrode 180 has four corners 181 to 184 respectively connected to the voltage applying wiring electrode 190, and a straight line 185 to 188 is formed between the corners 181 to 184. have.

Thus, when the ratio of the voltage applying electrode 180 is not adjusted, the voltage applied to the four corners 181 to 184 of the voltage applying electrode 180 is A to D of FIG. 9B or E to H of FIG. 9C. Curved equipotential lines are formed.

However, if the resistance value of the voltage applying electrode 180 is determined by adjusting the ratio with the sheet resistance (Ω / □) of the lower ITO film 140, the equipotential lines are straightened as shown in I of FIG. 9D.

On the other hand, if the voltage applied to the X-axis and the Y-axis is adjusted, as shown in FIG. 9E, a plurality of equipotential lines having different potential differences with respect to the Y-axis are formed in a straight line like J1 to Jn. In addition, a plurality of equipotential lines each having a different potential difference can be formed in a straight line on the X axis. When the equipotential lines are formed on the X-axis and the Y-axis of the voltage applying electrode 180, the signal sensing electrode 170 can detect which part is touched when the touch screen is touched.

In addition, a curved equipotential line is formed as shown in Figs. 9B A through D or E through H of Fig. 9C, and the voltage applying electrode 180 is concave according to the equipotential lines shown in Figs. Or a convex curve and determine the resistance value of the voltage applying electrode 180 by adjusting the ratio with the sheet resistance of the lower ITO film 140, such as A to D of FIG. 9B or E to H of FIG. 9C. The equipotential lines may be made straight such as I in FIG. 9D and J1 to Jn in FIG. 9E.

As such, the present invention is to achieve a simplified and improved reliability of the touch screen structure by applying a 5-wire resistive touch screen having high durability by configuring a voltage applying electrode to have a linearized voltage distribution.

Although the above has been described as being limited to the preferred embodiment of the present invention, the present invention is not limited thereto and various changes, modifications, and equivalents may be used. Therefore, the present invention can be applied by appropriately modifying the above embodiments, it will be obvious that such application also belongs to the scope of the present invention based on the technical idea described in the claims below.

1 is a cross-sectional view showing an application example of a conventional touch screen.

2 is a cross-sectional view showing another application example of the conventional touch screen.

FIG. 7 is a conceptual diagram illustrating an example in which a signal sensing electrode and a voltage applying electrode are coupled to an ITO electrode in FIG. 6.

FIG. 8 is a conceptual diagram illustrating an example of a voltage applying electrode and a wiring electrode in FIG. 7.

Explanation of symbols on the main parts of the drawings

110: upper ITO film

120: decorative printing layer

130: adhesive

140: lower ITO film

150: plastic substrate

160: spacer

170: signal detection electrode

180: voltage applied electrode

190: voltage applied wiring electrode

Claims

A plastic substrate forming a touch screen;

A plurality of equipotential lines attached to the plastic substrate by an adhesive, having a predetermined resistance value, formed in a quadrangular shape along the edge of the upper surface, and having different potential differences in the X axis direction and the Y axis direction orthogonal to the X axis, respectively. A lower ITO film having a voltage applying electrode formed in a straight line shape;

An upper ITO film positioned on the lower ITO film and having a signal sensing electrode formed thereon;

Spacers disposed at regular intervals on the lower ITO film;

Integrated window touch screen input device, characterized in that configured to include.

A plastic substrate forming a touch screen;

A plurality of equipotential lines are attached to the plastic substrate by an adhesive, have a predetermined resistance value, and have a curved shape along the top edge, and have different potential differences in the X-axis direction and the Y-axis direction orthogonal to the X-axis. A lower ITO film having a voltage applying electrode formed in a straight line shape;

Spacers disposed at regular intervals on the lower ITO film;

The method according to claim 1 or 2,

The window integrated touch screen input device,

A decorative printing layer attached to the upper ITO film and adhered to the lower ITO film by an adhesive;

Windows integrated touch screen input device, characterized in that further comprises.

The method according to claim 3,

The voltage applying electrode,

And the resistance value is determined by adjusting a ratio with the sheet resistance of the lower ITO film so that an equipotential line of a curve formed by the resistance value of the voltage applying electrode is straightened.

The method according to claim 4,

The voltage applying electrode,

An integrated window touch screen input device, characterized in that the resistance value is between 50 Ohm and 150 Ohm.

In the touch screen input device including an upper ITO film and a lower ITO film,

Is formed on the lower ITO film, has a predetermined resistance value and has a rectangular shape along the upper edge of the lower ITO film, a plurality of potential difference respectively in the X-axis direction and the Y-axis direction orthogonal to the X-axis A voltage applying electrode for forming an equipotential line in a straight line;

A signal sensing electrode formed under the one side of the upper ITO film and sensing a signal of the voltage applying electrode generated when the touch screen input device is touched;

Windows integrated touch screen input device, characterized in that configured to include.

Is formed on the lower ITO film, has a predetermined resistance value and has a curved shape along the upper edge of the lower ITO film, in the X-axis direction and the Y-axis direction orthogonal to the X-axis, a plurality of potential difference respectively A voltage applying electrode for forming an equipotential line in a straight line;

The method according to claim 6 or 7,

The window integrated touch screen input device,

A voltage applying wiring electrode wired in four lines so that a voltage is applied to the voltage applying electrode;

The method according to claim 8,

The voltage applying electrode,

The method according to claim 9,

The voltage applying electrode,