KR20090087351A - Fabrication of touchscreen based on tactile sensor attached to display and recognition algorithm thereof - Google Patents

Abstract

A display-integrated touch screen having a tactile sensor and a recognition algorithm realizing method thereof are provided to measure not only the contact position but also the contact force through the combination of signals obtained from a plurality of tactile sensors. A plurality of tactile sensors(30) are arranged between a lower substrate and a display(20). From the electric capacity or contact resistance generated from the tactile sensors, a display-combined touch screen detects the contact position, contact force and multi-touch. The tactile sensors are arranged in the matrix form of a plurality of rows and columns.

Description

Display integrated touch screen with tactile sensor and method for implementing recognition algorithm thereof {Fabrication of touchscreen based on tactile sensor attached to display and recognition algorithm}

The present invention, by installing a tactile sensor on the bottom of each of the various types of thin display, the mouse function to freely move the direction and rotation of the cursor of the screen, as well as change the rolling, typeface or color of the input character according to the size or speed of the touch force In addition, the present invention relates to a display integrated touch screen using a tactile sensor that can be applied as an interface device of a mobile device capable of slimming, and a method of implementing a recognition algorithm thereof.

In other words, by installing a tactile sensor in the form of a matrix or a display at the bottom of the thin-film display (LCD, OLED, electronic paper, etc.) means, the mouse function to freely move the screen cursor in the X, Y direction and rotation, Touch screen using a tactile sensor that can be used as an interface device of a mobile device that can not only change the type, color, or color of input characters according to the size or speed of the touched force, but also implements a recognition algorithm thereof It is about.

In general, the touch screen is mounted on the display LCD to recognize the contact position. Recently, touch screens used for new displays, OLED and electronic paper, are also mounted on the top of the display to adopt a method of sensing contact position. This approach has advantages in terms of protecting the display surface, but generally conflicts with input devices that are becoming slimmer as their thickness increases. In addition, in terms of sharpness, the touch screen on the display has a disadvantage of falling. Therefore, in addition to the slim display, the touch screen type input device is preferably mounted at the bottom of the display rather than at the top.

8 to 10 illustrate different examples of existing touch screens.

FIG. 8 illustrates a conventional capacitive touch screen including a substrate 110 made of film, plastic, or glass, an ITO metal layer 120 deposited on the substrate, and a transparent electrode 120 stacked thereon. When the pen or the finger contacts the insulating layer 13 formed on the insulating layer 130 and is formed on the transparent electrode 12, X and Y detection signals are applied to the transparent electrode 120. The position is detected by calculating the magnitude of the changed capacitance.

FIG. 9 is a resistive touch screen, and includes an upper substrate 210 and a lower substrate 210 'made of film, plastic, or glass, and a bottom surface of the upper substrate 210 and an upper surface of the lower substrate 210', respectively. The stacked transparent electrodes 220 and 220 'and the transparent electrodes 220 and 220' are disposed between the transparent electrodes 220 and 220 'to be spaced apart from each other. In addition, when the electric signal for position detection is applied to the transparent electrodes 220 and 220 'provided with the dot spacer 230 therebetween, the transparent electrode 220 is pressed when the upper substrate 210 is pressed by a finger or a pen. The electrical signal is detected by the lower transparent electrode 220 'when the transparent electrode 220' is contacted on the lower substrate 210 '. At this time, the position is determined using the magnitude of the detected electrical signal.

10 is a capacitive touch screen using a transparent electrode ITO in a matrix form, the disadvantage of the capacitive or resistive touch screen, that is, when used in a mobile phone or various monitors, the touched position information It was developed to compensate for the disadvantage of not being able to detect location information when two or more points are touched at the same time.

However, in the case of the Marlix method, the unit sensor changes the signal related to the capacitance depending on the contact, but cannot detect the amount of change in force. Therefore, the unit sensor recognizes only the contact and is used as the ON / OFF switch. The input was difficult.

That is, since the touch screen is attached to the upper portion of the display, it has a disadvantage of increasing the thickness and reducing the sharpness. Therefore, it is necessary to mount a touch screen that recognizes the contact position under the display LCD, OLED, and electronic paper. However, when the existing touch screen is mounted at the bottom of the display, it is not easy to find the point where the touch is touched because the force is not easily transmitted. Therefore, there is a need for a tactile sensor type touch screen that detects the contact position and the contact force by recognizing the force transmitted to the thin-film display. In addition, when the flexible display is popularized, a tactile sensor type touch screen with excellent durability is very useful. As shown in FIG. 12, when the touch screen is formed in a matrix form using the transparent electrode ITO and attached to the lower portion of the flexible display, the ITO transparent electrode is broken due to display flexibility. However, since the tactile sensor touch screen of the matrix type has excellent durability, the touch position and the contact force can be accurately recognized.

The present invention has been developed to solve the problems of the prior art as described above, an object of the present invention is to provide a touch screen thinner than the conventional method by mounting the tactile sensor on the lower portion of the display.

In addition, it is possible to recognize the position due to contact as well as to show the change in force, and through the change of the force to adjust the thickness or sharpness of the input character or model, and to provide a touch screen to improve the sharpness For the purpose of

The touch screen for achieving the above object is configured to arrange a plurality of tactile sensors in the lower portion of the display to detect the contact position and the contact force and the multi-touch from the capacitance or contact resistance generated by the tactile sensors, the tactile sensor is a plurality It is characterized by the matrix form arranged horizontally and horizontally and positioned at the lower edge of the display.

)과, 기준점(O)에서의 총 힘의 모멘트()로부터 상응하는 터치되는 부분의 위치(

)와 힘의 크기(

)에 관한 터치 정보를 입력하는 것을 특징으로 한다. The method of implementing the position recognition algorithm of the touch screen using the tactile sensor configured as described above is the reaction force of the total force acting on each tactile sensor centered on one reference point (O).

) And the position of the corresponding touched part from the moment of total force at the reference point O

) And the magnitude of the force (

Inputting touch information regarding

According to the present invention, a plurality of tactile sensors are installed in the lower part of the display and the contact force as well as the contact position are simultaneously measured by a combination of signals obtained from each tactile sensor, thereby enabling various information inputs. That is, the sharpness of the number or pattern input according to the contact position as well as the strength of the contact force is effective to freely adjust the strength or thickness.

In addition, by monitoring the force distribution of the tactile sensor over time, it is possible to provide a multi-touch recognition function.

Furthermore, by installing a plurality of tactile sensors in the lower portion of the existing display means, there is an effect of improving slimming and sharpness.

The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through embodiments of the present invention.

1 is a conceptual diagram of a touch screen using a tactile sensor according to the present invention, Figure 2 is a perspective view showing an example of a touch screen using a tactile sensor according to the present invention, Figure 3 is using a tactile sensor shown in Figure 2 4A to 4E are cross-sectional views illustrating a manufacturing process of an example of the tactile sensor constituting the touch screen using the tactile sensor according to the present invention, and FIGS. 5A to 5E are according to the present invention. Another example of a tactile sensor constituting a touch screen using a tactile sensor is a cross-sectional view for explaining a manufacturing process, and FIG. 6 illustrates an algorithm implementation method for processing a touch input of a touch screen using a tactile sensor according to the present invention. This is a graph.

As described above and shown, the touch screen using the tactile sensor according to the present invention is configured by installing the tactile sensor 30 in the vertical and horizontal direction, and the force applied to the distance and the contact portion between each tactile sensor 30 from the contact portion. It is characterized in that the position and the contact force of the contact portion can be detected from the reaction force of each tactile sensor 30 by.

As shown in FIG. 1, when a tactile sensor is distributed around a display such as an LCD, a method of implementing a contact portion identification algorithm of a touch screen according to the present invention is as follows.

)과, 기준점(O)에서의 총 힘의 모멘트()로부터 터치되는 부분의 위치(

)와 힘의 크기(

)에 관한 터치 정보를 입력한다. Reaction force of the total force acting on each tactile sensor 30 centering on one reference point O (

) And the position of the part touched from the moment of total force at the reference point O

) And the magnitude of the force (

Input touch information about).

)는 상기 총 힘의 반력(

)과 같고, 상기 접촉 부분의 위치(

)는 총 힘의 모멘트()를 접촉 부분의 힘의 크기(

)로 나눈 값으로부터 구해지며, 상기 총 힘의 모멘트()는 기준점(O)과 각 촉각센서(30)들 사이의 반력의 합으로부터 구해진다. Magnitude of force of the contact portion (

) Is the reaction force of the total force (

, The position of the contact portion (

) Is the total moment of force ()

Is obtained from the sum of reaction forces between the reference point (O) and the respective tactile sensors (30).

)는That is, the reaction force of the total force (

)

에 의해 구해지고, Equation

Saved by

)는 Position of the contact portion (

)

Equation

Obtained from

Hereinafter, the structure of the touch screen using the tactile sensor of the present invention will be described in detail.

The touch screen according to the present invention has a structure similar to that of the touch screen described in the related art, but unlike the conventional touch screen, the tactile sensor 30 is disposed in a plurality of horizontal and rows on the bottom of the display 20 or It is placed on the display border.

That is, the touch screen according to the present invention is provided with a plurality of tactile sensors 30 between the lower substrate 10 and the display 20, the tactile sensor 30 is arranged in the form of a matrix or the display 20 have.

In addition, the display 20 is configured to input and output information by contacting the surface by replacing with a display means such as a conventional thin LCD.

The display 20 may be any one of display means including an LCD, an OLED, an electronic paper, and a flexible display.

As shown in FIG. 7, the tactile sensor 30 may be vertically overlapped with each other to form a lattice form or a border around the display 20.

The tactile sensors 30 are means for detecting the contact position and the contact force from the capacitance or the contact resistance generated by contacting the surface.

The tactile sensor 30 may be configured in a capacitive manner and a resistive manner.

In the case of the electrostatic capacitance method, the process is made by the process shown in Figs. 4A to 4E, and the structure is constructed as follows.

That is, the capacitive tactile sensor 30 includes two thin films 31 and 32; Electrode patterns 31a and 32a stacked on one side of the films 31 and 32; It is composed of a spacer 33 provided between the films 31, 32 to maintain the distance between the films 31, 32.

The two films 31 and 32 constituting the capacitive tactile sensor 30 configured as described above may be made of polyimide film or polyester film, and do not use separate films 31 and 32. The electrodes may be formed on the upper and lower substrates 20 and 10 or a resistor may be used immediately.

The electrode patterns 31a and 32a may be made of any one of metal, copper, gold, or carbon nanotubes (CNT), but preferably copper.

The spacer 33 is made of an insulating material as a structure for maintaining the distance between the two films 31 and 32.

The electrode patterns 31a and 32a are formed at positions facing each other, but are separated by the film 31 as shown in FIG. 4E so as not to contact each other.

The other tactile sensor 30 is a resistive tactile sensor configured as shown in FIGS. 5A to 5E.

 The resistance type tactile sensor 30 includes two two thin films 31 'and 32'; Electrode patterns 31a 'and 32a' stacked on opposite surfaces of the films 31 'and 32'; A spacer 33 'installed between the films 31' and 32 'to maintain a distance between the films 31' and 32 '; It is composed of two resistance patterns (31b ', 32b') which are provided in the electrode patterns (31a ', 32a',) and the contact resistance generated by contact with each other is different.

The films 31 'and 32' constituting the resistive tactile sensor 30 and the electrode patterns 31a 'and 32a' are films 31 and 32 constituting the capacitive tactile sensor 30. And the electrode patterns 31a and 32a, and the resistance patterns 31b 'and 32b' are made of nickel chromium (Ni-Cr) or a carbon layer and a reduced pressure ink.

The process of configuring the tactile sensor in the touch screen configured as described above is as follows.

Depositing electrode patterns 31a and 32a on one side of the two thin films 31 and 32, and forming a spacer 33 between the two films 31 and 32 on which the electrode patterns 31a and 32a are formed. Installation and bonding the two films 31, 32 to each other.

Sputtering may be used to form the electrode patterns 31a and 32a. The electrode patterns 31a and 32a may be made of copper, gold, or carbon nanotubes (CNT), but preferably copper. .

Thus, the electrode patterns 31a and 32a formed on the films 31 and 32 are formed on the upper surfaces of the films 31 and 32, as shown in FIG. 4E. 31a and 32a are isolated and are not in contact with each other.

The tactile sensor 30 thus made is installed between the two substrates 10 and 20 in a state arranged at the edge between the upper and lower substrates 20 and 10.

Of course, as described above, when the film 31, 32 constituting the tactile sensor 30 is replaced by the upper and lower substrates 20, 10, the electrode patterns (2) directly on the two substrates (10, 20) 31a, 32a).

The capacitive tactile sensor has been described above. Hereinafter, a process of manufacturing the resistive tactile sensor will be described.

The manufacturing method of the resistive tactile sensor is generally similar to the capacitive tactile sensor. However, a process of forming the resistance patterns 31b 'and 32b' is further performed, and the resistance patterns 31b 'and 32b' are formed on the surfaces of the two thin films 31 'and 32' facing each other. It is formed in the patterns 31a 'and 32a'.

In addition, the electrode patterns 31a 'and 32a' and the resistance patterns 31b 'and 32b' are formed on opposite surfaces of the two films 31 'and 32' so that when the film 31 'is deformed. The distance between the resistance patterns 31b 'and 32b' can be changed.

As described above, the touch screen configured as described above has a position between the contact portion and the contact force from the reaction force of each tactile sensor 30 by the force applied to the contact portion and the distance between the tactile sensor 30 from the contact portion. Will be detected.

In general, since the thin film type display 20 such as LCD, OLED, and electronic paper has rigidity, in order to realize a touch screen, the tactile sensor is preferably located at the edge of the display 20. On the other hand, in the case of the display 20 having a small rigidity, it is preferable to arrange the tactile sensor in a matrix form as shown in FIG. 9. Therefore, in order to implement a touch screen in a future flexible display, a tactile sensor in a matrix form is required.

6 is a graph illustrating an algorithm implementation method for processing a touch input of a touch screen.

As shown, the tactile sensor is installed on each of the top, bottom, left and right, and the reference point O is located at the center of the four tactile sensors.

In the process of processing the touch input of the touch screen configured as described above

)은 Reaction force of total force

)silver

ego,

)는Total moment of force at reference point (O)

)

 ,

)은 The point at which total reaction force acts (

)silver

to be.

From the above equation, we can find the position of the point where the total reaction force acts.

The total force magnitude P obtained from the above equation is

이고,

ego,

The x coordinate of the position where the total reaction force is acting

y coordinate

to be.

As described above, both the position of the contact portion and the magnitude of the force applied to the contact portion can be known from the tactile sensor disposed under the display 20, and the thickness or density of the characters or figures displayed on the screen using this information. Etc. can be adjusted.

In the above description, the properties of the detected signal may vary according to the method of the tactile sensor, and the property of the detected signal is divided into capacitance and resistance, and the technology related to the detection of the signal has already been signaled from the conventional tactile sensor. Since it is similar to the method of detecting the detailed description thereof will be omitted.

In the method of implementing the character input and font change recognition algorithm of the touch screen using the tactile sensor according to the present invention, the font may be changed in consideration of the character recognition through the contact trace and the touch force size and the speed of pressing the touch screen.

For example, the thickness or color of a character may be changed according to the magnitude of the pressing force of the touch screen made of the tactile sensor, and the font may be changed according to the pressing speed.

Therefore, by using the touch screen using the tactile sensor, it is possible to transmit the font containing the emotion of the user beyond the uniform character transmission method through the existing keypad.

In addition, depending on the speed of pressing the touch screen, that is, the speed of typing may cause the font to be italic.

1 is a conceptual diagram of a display integrated touch screen equipped with a tactile sensor according to the present invention,

2 is a perspective view showing an example of a touch screen according to the present invention;

3 is a side cross-sectional view of the touch screen shown in FIG.

4A to 4E are cross-sectional views illustrating a manufacturing process of an example of a tactile sensor constituting a touch screen according to the present invention;

5A to 5E are cross-sectional views illustrating a manufacturing process of another example of the tactile sensor constituting the touch screen according to the present invention;

6 is a graph illustrating an algorithm implementation method for processing a touch input of a touch screen according to the present invention;

7 is a manufacturing picture of the touch screen according to the present invention,

FIG. 8 is a diagram illustrating a configuration of a conventional touch screen.

<Explanation of symbols for the main parts of the drawings>

10: lower panel

20: display

30: tactile sensor

  31, 31 ', 32, 32': film 31a, 31a ', 32a, 32a': electrode pattern

  31b ', 32b': Resistance patterns 33, 33 ': spacer

40: load bump

Claims (12)

By arranging a plurality of tactile sensors 30 between the lower substrate 10 and the display 20 to configure the touch position and the contact force and the multi-touch from the capacitance or contact resistance generated in the tactile sensors 30, , The tactile sensor 30 is a display-integrated touch screen equipped with a tactile sensor, characterized in that arranged in a plurality of horizontal and columnar matrix arrangement. The method of claim 1, The display 20 is a display integrated touch screen equipped with a tactile sensor characterized in that the transparent plate. The method of claim 1, The display 20 is a display integrated touch screen with a tactile sensor, characterized in that any one of the display means, including LCD, OLED, electronic paper, flexible display. The method according to any one of claims 1 to 3, wherein The tactile sensor 30 is a capacitive sensor, Two thin films 31 and 32; Electrode patterns 31a and 32a stacked on one side of the films 31 and 32; A display-integrated touch screen with a tactile sensor, characterized in that consisting of a spacer (33) installed between the films (31, 32) to maintain the distance between the films (31, 32). The method according to any one of claims 1 to 3, wherein The tactile sensor 30 is a resistance sensor, Two two thin films 31 'and 32'; Electrode patterns 31a 'and 32a' stacked on opposite surfaces of the films 31 'and 32'; A spacer 33 'installed between the films 31' and 32 'to maintain a distance between the films 31' and 32 '; The display integrated touch screen mounted with the tactile sensor, characterized in that the contact pattern is installed on the electrode patterns (31a ', 32a,) is composed of two resistance patterns (31b', 32b ') that is different from each other. The method of claim 5, wherein The resistive patterns (31b ', 32b') is a display integrated touch screen with a tactile sensor, characterized in that the pressure-sensitive ink, carbon layer, nickel chromium (Ni-Cr). The method according to claim 4 or 6, The electrode pattern (31a, 32a, 31a ', 32a') is a display integrated touch screen with a tactile sensor, characterized in that the metal is copper, gold or carbon nanotubes (CNT). The method of claim 7, wherein The load bump 40 is further installed between the display 20 and the tactile sensor 30, The load bump 40 is a display-integrated touch screen with a tactile sensor, characterized in that it is installed in a portion facing the electrode pattern (31a, 32a, 31a ', 32a'). The method of claim 8, The tactile sensor 30 is a display integrated touch screen equipped with a tactile sensor, characterized in that further installed on the edge of the display (20). By arranging a plurality of tactile sensors 30 between the upper substrate 10 and the display 20 to configure the touch position and the contact force and the multi-touch from the capacitance or contact resistance generated in the tactile sensors 30, The tactile sensor 30 relates to a method of implementing a recognition algorithm of a display integrated touch screen equipped with a tactile sensor composed of a plurality of force sensors. The reaction force of the total force acting on each tactile sensor 30 centering on one reference point O (

) And the position of the corresponding touched part from the moment of total force at the reference point O

) And the magnitude of the force (

Implementing a display-integrated touch screen algorithm with a tactile sensor, characterized in that for inputting touch information. The method of claim 10, Magnitude of force of the contact portion (

) Is the reaction force of the total force (

), Position of the contact portion (

) Is the total moment of force ()

Is divided by) The moment of the total force () is obtained from the sum of the reaction force between the reference point (O) and each of the tactile sensors (30). The method of claim 10 or 11, Character input function through the contact of the tactile sensor; According to the magnitude of the pressing force of the tactile sensor, the thickness of the text is changed or the color of the text is changed, A method of implementing a recognition algorithm for a display-integrated touch screen with a tactile sensor, characterized in that it has a function of changing a font according to the speed of pressing the tactile sensor.

Images