KR20110058616A - Method and apparatus for calculating multi touch points on touch screen - Google Patents

Abstract

PURPOSE: A multiple contact point coordinate calculation method of a touch screen is provided to implement a multi-touch screen panel by calculating the coordinate of multiple contact points to a touch screen panel. CONSTITUTION: A touch screen panel is determined based on the resistance value of first/second substrates(S1). A direction vector of the multiple contact point is calculated(S3, S5). The coordinate of the multiple contact point is calculated based the separation distance of a multiple contact point and a direction vector(S7). The direction vector of the multiple contact point is calculated to forward and backward directions.

Description

{Method and apparatus for calculating multi touch points on touch screen}

The present invention relates to a touch screen, and more particularly, to a coordinate of a multi-contact point in a resistive touch screen having a first substrate having an upper electrode and a lower electrode formed thereon, and a second substrate having a left end electrode and a right end electrode formed thereon. It is about how to calculate.

Along with the development of computers using digital technology, auxiliary devices are being developed accordingly, and personal computers, portable transmission devices, and other personal information processing devices include various input devices such as a keyboard, a mouse, and a digitizer. Input device) processes text and graphics.

As the information society progresses, the necessity for processing various texts and graphics increases, which makes it difficult to operate an efficient product only with a keyboard and a mouse that act as an input device as an interface. In addition, there is a strong demand for the development of a device that can be easily input by anyone, in particular, information input by hand while being carried by the customer.

Nowadays, attention is shifting to more sophisticated technologies, such as high reliability, the provision of new features, durability, and manufacturing techniques related to design and processing involving materials or materials, beyond meeting the needs associated with the general functions of these input devices. In response to the purpose, a touch screen panel has been developed as an input device that is simple, has less misoperation, and can input information such as text input without any other input device.

The touch screen panel is installed on the display surface of an image display device such as a mobile phone, an electronic notebook, a liquid crystal display, a plasma display panel (PDP), an electroluminescense (EL), and a cathode ray tube (CRT). It is a tool used to select the desired information while looking at the image display device. It is largely a resistive type touch screen panel, a capacitive type touch screen panel, and an electromagnetic field type (EM). Magnetic Type) Touch Screen Panel, Saw Type and Infrared Type Touch Screen Panel.

The touch screen panel not only has the problem of signal amplification, difference in resolution, difficulty of design and processing technology, but also the optical, electrical, mechanical, environmental, input, durability and economical characteristics of each touch screen panel. It is selected for individual electronic products in consideration, and particularly resistive type touch screen panels are widely used in electronic notebooks, PDAs, portable PCs and mobile phones.

The resistive touch screen panel has a second substrate on which a left end electrode and a right end electrode are formed when a point is contacted with a predetermined input means such as a pen or a finger on the first substrate on which the top electrode and the bottom electrode are formed. After energizing with the first substrate and reading the changed voltage value at the position, the position coordinate is detected in accordance with the change in the potential difference. Such a resistive film type can recognize the position at which the contact is made, regardless of the input tool, so that a conductive pen is not particularly required, and the position can be sufficiently detected by a gloved hand or a non-conductive pen during the experiment.

1 is a view for explaining the configuration of a conventional single touch screen panel.

Referring to FIG. 1, the conductive first substrate 20 is disposed above the insulating dot 10 around the insulating dot 10, and the conductive second substrate 40 is disposed below the insulating line dot 10. do. In addition, the first optical transparent adhesive film 30 is coated on the upper surface of the first substrate 20, while the second optical transparent adhesive film 5 is coated on the lower surface of the second substrate 4.

The upper electrode Y + and the lower electrode Y− are formed at opposite edges in the Y-axis longitudinal direction of the first substrate 2. In addition, the right end electrode X− and the left end electrode X + are formed to face each other at edges in the X-axis longitudinal direction of the second substrate 4. In some cases, the single touch screen panel is formed such that the right end electrode and the left end electrode are opposite to each other on the first substrate 2 at both ends of the X axis in the longitudinal direction, and the top electrode is disposed at both ends of the Y axis in the Y direction on the second substrate 4. The lower electrode may be formed to face each other.

FIG. 2 is a diagram for describing a method of calculating coordinates of a contact point when a contact point occurs in the single touch screen panel illustrated in FIG. 1.

As a touch point occurs on the touch screen panel, a driving voltage V _DD is applied to the upper electrode Y + of the first substrate 2 as shown in FIG. 2A to calculate the y-axis coordinate. And the bottom electrode (Y-) is grounded. In addition, the voltage value is read out through the right end electrode X + in a state where the left end X− electrode of the second substrate 4 is floated. Through the voltage value read from the right end electrode X +, the Y-axis coordinate of the contact point may be calculated as in Equation (1) below.

[Equation 1]

Here, V _{X +} denotes a voltage value read from the right end electrode X +, and h denotes a length in the Y-axis direction of the first substrate 2 and the second substrate 4.

Meanwhile, in order to calculate the Y-axis coordinates, as shown in FIG. 2B, a driving voltage V _DD is applied to the right end electrode X + of the second substrate 4 and the left end electrode X− is applied. Ground it. In addition, the voltage value is read through the top electrode Y + in a state where the bottom electrode Y− of the first substrate 2 is floated. Based on the voltage value read from the upper electrode Y +, the X-axis coordinate of the contact point may be calculated as in Equation 2 below.

[Equation 2]

Here, V _{Y +} denotes a voltage value read from the upper electrode X +, and w denotes a length in the X-axis direction of the first substrate 2 and the second substrate 4.

As described above, the touch screen illustrated in FIG. 1 extracts the X and Y axis coordinates of one contact point on a two-dimensional plane by a relative voltage difference between the point where the first substrate 2 and the second substrate 4 are connected. can do.

However, the conventional single touch screen panel described above can extract only the coordinates of one touch point, and when two or more touch points occur simultaneously in a single touch screen panel, a plurality of touch points cannot be detected due to mutual influence between the touch points. , The median value for a plurality of contact points is calculated as coordinates. That is, since the multi-contact points are recognized as one coordinate instead of each, the multi-contact point input cannot be processed.

In order to solve this disadvantage, a multi-touch screen panel has been proposed. The multi-touch screen panel is configured to divide the first substrate into a plurality of strip lines so that the strip lines are separated from each other in the physical and electrical sides, and the second substrate also includes a plurality of strip lines in a direction perpendicular to the strip lines of the first substrate. It is a touch screen panel that is divided into strip lines and configured to separate strip lines in physical and electrical aspects.

Coordinates for multiple touch points may be calculated through the multi-touch screen panel, but in order to calculate coordinates for the multi-contact points, the first substrate and the second substrate should be composed of a plurality of strip lines. There is a problem in that a large cost is required to manufacture a touch screen. Furthermore, since the wires are made of a conductive material such as silver and the electrodes are formed in each of the plurality of strip lines, the manufacturing process is complicated and the defect rate increases in each process. In addition, the multi-touch screen panel has a problem in that the effective touch area is reduced due to the need for a space in which a plurality of wires are arranged.

Therefore, the present invention is to solve the problems of the conventional single touch screen panel and the problem of the multi-touch screen panel, the object of the present invention is to achieve a multi-contact point through the first substrate and the second substrate consisting of a single strip line To provide a way to calculate the coordinates.

Another object of the present invention is to provide a method for calculating coordinates of a multi-contact point, which is cheaper and simpler than that of a conventional multi-touch screen panel.

The coordinate calculation method of the multi-contact point according to the present invention comprises the steps of determining the vertical separation distance and the horizontal separation distance between the multi-contact point of the touch screen based on the resistance change value of the first substrate and the resistance change value of the second substrate; Calculating a separation distance between the multiple contact points based on the determined vertical distance and the left and right distance between the multiple contact points, calculating an intermediate coordinate between the direction vector of the multiple contact points and the multiple contact points, and calculating And calculating the coordinates of the multiple contact points based on the separation distance between the multiple contact points, the intermediate coordinates of the multiple contact points, and the direction vector of the multiple contact points.

The vertical and horizontal separation distances of the multiple contact points may be measured by measuring a resistance change value between the upper electrode and the lower electrode of the first substrate and a resistance change value between the left electrode and the right electrode of the second substrate. 1 searching the database for a vertical distance corresponding to the resistance change value of the substrate and a horizontal separation distance corresponding to the measured resistance change value of the first substrate, and multiplying the searched vertical distance and the horizontal separation distance It is calculated through the step of determining the vertical separation distance and the horizontal separation distance between the contact point.

Herein, the vertical center coordinates of the multi-contact point may include calculating upper and lower center coordinates of the multi-contact point at the upper electrode of the first substrate, calculating upper and lower lower center coordinates of the multi-contact point at the lower electrode of the first substrate, And calculating the center coordinates of the calculated top center coordinates and the bottom center coordinates as the vertical center coordinates of the multi-contact point. The left and right center coordinates of the multi-contact point may be calculated by calculating left and right left center coordinates of the multi-contact point at the left electrode of the second substrate and calculating left and right right center coordinates of the multi-contact point at the right electrode of the second substrate. And calculating the center coordinates of the calculated left end center coordinates and the right end center coordinates as the left and right direction center coordinates of the multi-contact point.

The coordinate calculation method of the multi-contact point according to the present invention has the following various effects compared to the multi-contact point coordinate calculation method of the conventional multi-screen panel.

First, the coordinate calculation method of the multi-contact point according to the present invention can accurately calculate the coordinates of the multi-contact point in the configuration of the conventional single touch screen panel.

Second, the coordinate calculation method of the multi-contact point according to the present invention can calculate the coordinates of the multi-contact point in the configuration of the conventional single touch screen panel, it is possible to drive the multi-touch screen panel at a lower cost than the conventional multi-touch screen panel.

Third, the coordinate calculation method of the multi-contact point according to the present invention can increase the effective touch area of the touch screen panel by using only a single wire connected to the upper and lower electrodes of the first substrate and the left and right electrodes of the second substrate, respectively. Can be.

Fourth, in the method of calculating the coordinates of the multi-touch points according to the present invention, by calculating the coordinates of the multi-touch points with the configuration of the single touch screen panel, the manufacturing process of the multi-touch screen panel can be simplified and thus the defective rate can be reduced.

3 is a flowchart illustrating a method of calculating multiple contact point coordinates according to an embodiment of the present invention. The method of calculating the multi-contact point coordinates according to an embodiment of the present invention relates to a method of calculating the coordinates of the multi-contact point in the conventional single touch screen described with reference to FIGS. 1 and 2, and hereinafter, overlaps with the single touch screen structure. In order to avoid the description will be described with reference to the conventional single touch screen described above.

Referring to FIG. 3, in the case where multiple contact points occur in the touch screen panel 1, the multiple contact points may be disposed between the multiple contact points based on the resistance value of the first substrate 20 and the resistance value of the second substrate 40. Determine the Y-axis spacing and the X-axis spacing of (S1). When multiple contact points occur on the first substrate 20, the resistance value of the first substrate 20 is changed to a value smaller than the intrinsic resistance of the first substrate 20, and the multiple contact points on the second substrate 40 are changed. When generated, the resistance value of the second substrate 40 is changed to a value smaller than the intrinsic resistance of the second substrate 40. Here, the larger the Y-axis separation distance between the multiple contact points, the smaller the resistance value of the first substrate 20 than the intrinsic resistance of the first substrate 20, and the larger the X-axis separation distance between the multiple contact points, the second substrate 40 ) Is smaller than the resistivity of the second substrate 40.

The resistance value of the first substrate 20 is measured, and the Y axis separation distance between the multiple contact points mapped to the measured resistance value of the first substrate 20 is searched in the database of the Y axis separation distance. Meanwhile, the resistance value of the second substrate 40 is measured, and the X-axis separation distance between the multiple contact points mapped to the measured resistance value of the second substrate 40 is searched in the database of the X-axis separation distance. Preferably, the resistance value of the first substrate 20 is measured based on the voltage value between the upper electrode and the lower electrode of the first substrate 20, and the resistance value of the second substrate 40 is the left end electrode and the right end electrode. Measure based on the voltage value between. The Y-axis spacing and the X-axis spacing of the searched multi-contact points are determined as the Y-axis spacing and the X-axis spacing of the multi-contact points, respectively. According to the field to which the present invention is applied, the Y-axis separation distance between the multiple contact points may be directly calculated using the resistance value of the first substrate 20 measured, and the resistance value of the second substrate 40 may be measured. The X-axis separation distance between the multiple contact points can be calculated directly. The Y-axis and X-axis distances calculated by hand are determined as the Y-axis and X-axis distances of the multi-contact points, respectively.

4 is a Y-axis separation distance between multiple contact points according to the voltage value V _A between the upper electrode and the lower electrode of the first substrate 20 and the voltage value between the left and right end electrodes of the second substrate 40. An example of a database storing X-axis separation distances between multiple contact points according to (V _B ) is shown.

Meanwhile, the direction vector of the multiple touch points is calculated in either the forward direction or the backward direction based on the positional relationship of the multiple touch points generated in the touch screen panel 1 (S3). Here, the positional relationship between the multiple contact points generated in the touch screen panel 1 may be calculated based on the voltage difference measured at the upper electrode and the lower electrode of the first substrate 20 or at the left and right electrodes of the second substrate 40. Calculate based on the measured voltage difference.

In addition, the center coordinates of the multiple touch points generated in the touch screen panel 1 are calculated (S5). The vertical coordinates of the vertical contact points of the multi-contact points are calculated by calculating upper and lower direction upper and lower center coordinates of the multi-contact point in the upper and lower electrodes of the first substrate 20, respectively, and calculating the calculated upper and lower direction upper and lower center coordinates. The center coordinates of the lower center coordinates are calculated as the vertical center coordinates of the multiple contact points. The left and right center coordinates of the multi-contact point are calculated from the left and right end center coordinates of the multi-contact point and the right and left right center coordinates of the left and right electrodes of the second substrate 40, respectively. The center coordinates of the right and left right center coordinates are calculated as the left and right center coordinates of the multi-contact point.

Based on the X-axis spacing and Y-axis spacing of the multi-contact points calculated in step S1, the direction vector of the multi-contact points calculated in step S3, and the center coordinates of the multi-contact points calculated in step S5, The coordinates of the contact point are calculated (S7).

FIG. 5 is a diagram illustrating a resistance value of the first substrate 20 and the second substrate 40 when multiple contact points occur in a single touch screen panel. When two contact points P ₁ and P ₂ are generated in the single touch screen panel 1 as illustrated in FIG. 5A, FIG. 5B illustrates a resistance value of the first substrate 20. Schematically shown, FIG. 5C schematically shows the resistance of the second substrate 40.

Referring to FIG. 5B, when two contact points P ₁ and P ₂ are generated in the single touch screen panel ₁ , the Y-axis coordinates of the first contact point P ₁ may be formed on the first substrate 20. There are two resistors P _Y1 , P _Y2 connected in parallel between the position corresponding to the Y-axis coordinate P _2Y of P _1Y and the second contact point P ₂ , and thus the first substrate 20. The resistance value of is smaller than the intrinsic resistance of the first substrate 20 by the two resistors P _Y1 and P _Y2 connected in parallel. 6 (a) shows a distance between the Y-axis coordinate P _1Y of the first contact point P ₁ and the Y-axis coordinate P _2Y of the second contact point P ₂ , that is, the first contact point P ₁ and An example of a change state of the resistance value of the first substrate 20 according to the Y-axis separation distance of the second contact point P ₂ is illustrated. As shown in FIG. 6A, the smaller the resistance value R ₁ of the first substrate 20 is, the Y-axis spacing d between the first contact point P ₁ and the second contact point P ₂ d. _Y ) increases.

In addition, referring to FIG. 5C, when two contact points P ₁ and P ₂ are generated in the single touch screen panel ₁ , the X-axis of the first contact point P ₁ may be formed on the second substrate 40. There are two resistors P _X1 and P _X2 connected in parallel between the coordinates P _1X and the position corresponding to the X-axis coordinates P _2X of the second contact point P ₂ , and thus the second substrate 40 ) _{Has a} resistance value smaller than the intrinsic resistance of the first substrate 20 by two resistors P _X1 and P _X2 connected in parallel. 6 (b) shows a distance between the X-axis coordinate P _1X of the first contact point P ₁ and the X-axis coordinate P _2X of the second contact point P ₂ , that is, the first contact point P ₁ and An example of a change state of the resistance value of the second substrate 40 according to the X-axis separation distance of the second contact point P ₂ is illustrated. As shown in FIG. 6B, the smaller the resistance value R ₂ of the second substrate 40 is, the X-axis separation distance d between the first contact point P ₁ and the second contact point P ₂ d is obtained. _X ) increases.

7 is a circuit diagram for describing a method of measuring a resistance value of the first substrate 20.

Referring to an example of a method of measuring the resistance value of the first substrate 20 with reference to FIG. 7A, one end of the reference resistance R _ref is connected to the lower electrode 23 of the first substrate 20. The other end of the reference resistor R _ref is grounded. The driving voltage V _DD is applied to the upper electrode 21 of the first substrate 20, and the voltage value V _A is applied between the lower electrode 23 of the first substrate 20 and the reference resistor R _ref . When measured, it is as following Formula (3).

&Quot; (3) "

Here, R ₁ means the resistance value of the first substrate 20.

The magnitude of the voltage value V _A changes according to the change in the resistance value R ₁ of the first substrate 20, and the resistance value of the first substrate 20 is changed based on the magnitude of the voltage value V _A. Measure

Referring to another example of a method of measuring the resistance of the first substrate 20 with reference to FIG. 7B, a current source I for applying a current having a predetermined magnitude to the upper electrode 21 of the first substrate 20 is described. _ref ) is connected, and the voltage value V _B between the upper electrode 21 and the lower electrode 23 of the first substrate 20 is measured, as shown in Equation (4) below.

&Quot; (4) "

The magnitude of the voltage value V _B according to the change in the resistance value R ₁ of the first substrate 20 is changed, and the resistance value of the first substrate 20 is based on the magnitude of the voltage value V _B. (R ₁ ) is measured.

Since the resistance value of the second substrate 40 may also be measured by the same method as the above-described example or another example, a detailed description of the method of measuring the resistance value of the second substrate 40 will be omitted. Preferably, the method of measuring the resistance values of the first substrate 20 and the second substrate 40 described above is described as an example, and the resistance values of the first substrate 20 and the second substrate 40 are measured. Other ways may be used for this, which is within the scope of the present invention.

8 is a view for explaining in more detail the step of calculating the direction vector of the multiple contact point according to the present invention. In order to calculate the direction vector of the multiple contact points generated in the touch screen panel 1, the driving voltage V _DD is applied to one terminal of the upper electrode or the lower electrode of the first substrate 20, and the other electrode is grounded. When the voltages are measured at the left end electrode 41 and the right end electrode 43 of the second substrate 40, respectively, the voltage is measured at either side of the left end electrode 41 or the right end electrode 43 in the forward direction or the backward direction. The magnitude of the voltage value is higher than the magnitude of the voltage value measured by the other side. The direction vectors of the multiple contact points are calculated according to the magnitudes of the voltage values V _X− and V _{X + of the} left end electrode 41 and the right end electrode 43.

Referring to FIG. 8A, the step of calculating the direction vector in the forward direction will be described in detail. After applying the driving voltage V _DD to the upper electrode of the first substrate 20 and grounding the lower electrode, When the left end electrode 41 of the second substrate 40 is left in a floating state and the voltage value V _{X +} is measured at the right end electrode 43, it is represented by Equation 5 below and the right end of the second substrate 40 is measured. When the voltage value V _X− is measured at the left end electrode 41 while the electrode 43 is in the floating state, the following equation (6) is obtained.

[Equation 5]

&Quot; (6) "

When the slope of the direction vector of the multiple contact points P ₁ and P ₂ generated in the touch screen panel 1 is positive, that is, in the forward direction, the magnitude of the voltage value V _{X +} measured by the right end electrode 43 is the left end electrode. It is larger than the magnitude of the voltage value V _X- measured at (41). Here, V ₁ is the voltage value of the first contact point P ₁ of the multiple contact points and V ₂ is the voltage value of the second contact point P ₂ of the multiple contact points.

Referring to FIG. 8B, the step of calculating the direction vector in the backward direction is described in more detail. After applying the driving voltage V _DD to the upper electrode of the first substrate 20 and grounding the lower electrode, When the left end electrode 41 of the second substrate 40 is left in a floating state and the voltage value _{VX +} is measured at the right end electrode 43, the following equation (7) is used. When the right end electrode 43 is left in a floating state and the voltage value V _X− is measured at the left end electrode 41, the following Equation (8) is obtained.

[Equation 7]

[Equation 8]

When the slope of the direction vector of the multiple contact points P ₃ and P ₄ generated in the touch screen panel 10 is negative, that is, in the backward direction, the magnitude of the voltage value V _X− measured by the left electrode 41 is It is larger than the magnitude of the voltage value V _{X +} measured by the right electrode 43. Here, V ₃ is a voltage value of the first contact point P ₃ among the multiple contact points, and V ₄ is a voltage value of the second contact point P ₄ among the multiple contact points.

FIG. 8 illustrates that the driving voltage V _DD is applied to the upper electrode of the first substrate 20 and the lower electrode is grounded, respectively, at the left electrode 41 and the right electrode 43 of the second substrate 40. The method of calculating the direction vector of multiple contact points by measuring the voltage has been described. However, in a state in which the driving voltage V _DD is applied to the right end electrode 43 of the second substrate 20 and the left end electrode 41 is grounded, voltages are respectively applied to the upper and lower electrodes of the first substrate 20. By measuring, the direction vector of the multiple contact points can be calculated in the same manner as described in FIG. 8, which is within the scope of the present invention.

9 is a view for explaining in more detail the step of calculating the center coordinates of the multi-contact point in accordance with the present invention. In order to calculate the center coordinates of the multiple touch points generated in the touch screen panel 1, a driving voltage V _DD is applied to one of the upper and lower electrodes of the first substrate 20, and the other terminal is grounded. Calculate the up-down direction (ie, Y-axis direction) center coordinates of the center coordinates of the multi-contact point, apply a driving voltage (V _DD ) to any one terminal of the left end electrode or the right end electrode of the second substrate 40 and the other terminal Calculate the center coordinates of the left and right directions (ie, X-axis directions) of the center coordinates of the multi-contact point with the grounded state.

Referring to FIG. 9 (a), a method of calculating the center coordinates of the vertical contact points of the multi-contact point in detail will be described. After applying the driving voltage V _DD to the upper electrode of the first substrate 20 and grounding the lower electrode, With the left end electrode 41 of the second substrate 40 in a floating state, the upper and lower upper center coordinates C _Y1 of the multiple contact points are calculated based on the voltage value V _{X +} measured at the right end electrode 43. . Meanwhile, after the driving voltage VDD is applied to the upper electrode of the first substrate 20 and the lower electrode is grounded, the left electrode 43 of the second substrate 40 is left in a floating state. Based on the measured voltage value V _X- , the upper and lower center coordinates C _Y2 of the multiple contact points are calculated. The centers of the calculated upper and lower direction upper center coordinates C _Y1 and the upper and lower direction lower center coordinates C _Y2 are calculated as the upper and lower direction center coordinates C _Y of the multiple contact points.

Referring to FIG. 9 (b), the method for calculating the left and right center coordinates of the multi-contact point in more detail, after applying the driving voltage V _DD to the right electrode of the second substrate 40 and grounding the bottom electrode Based on the voltage value V _{Y +} measured at the upper electrode 21 with the lower electrode 23 of the first substrate 20 in a floating state, the left-left center coordinates C _X1 of the multiple contact points are calculated. . Meanwhile, after the driving voltage V _DD is applied to the right end electrode of the second substrate 40 and the left end electrode is grounded, the bottom electrode 23 is placed with the top electrode 21 of the first substrate 20 in a floating state. Based on the voltage value (V _Y− ) measured at, calculate the left and right right center coordinates (C _X2 ) of the multiple contact points. Calculate the center of the calculated left end right and left direction center coordinates (C _X1) and left and right directions right end center coordinates (C _X2) to the left-right direction center coordinates of the multiple contact points (C _X).

FIG. 10 is a diagram for describing an example of a method of calculating the center coordinates of multiple contact points in more detail.

Referring to FIG. 10 (a), the direction vector of the multiple contact points P ₁ and P ₂ is a forward direction, and the X axis distance ΔX and the Y axis distance Δ of the multiple contact points P ₁ and P ₂ are Δ. Y), when the center coordinates (C _X , C _Y ) of the multiple contact points (P ₁ , P ₂ ) are calculated, the coordinates (P _1X , P _1Y ) of the first contact point (P ₁ ) is expressed by the following equation (9) ), And the coordinates P _2X and P _2Y of the second contact point P ₂ are calculated as shown in Equation 10 below.

[Equation 9]

,

,

[Equation 10]

,

,

Referring to FIG. 10 (b), the direction vector of the multi-contact points P ₃ and P ₄ is a backward direction, and the X-axis spacing ΔX and the Y-axis spacing of the multi-contact points P ₃ and P ₄ ( ΔY), when the center coordinates C _X and C _{Y of the} multiple contact points P ₃ and P ₄ are calculated, the coordinates P _3X and P _3Y of the first contact point P ₃ are expressed by the following equation ( 11), the coordinates P _4X and P _4Y of the second contact point P ₄ are calculated as shown in Equation 12 below.

[Equation 11]

,

,

[Equation 12]

,

,

FIG. 11 is a functional block diagram illustrating an apparatus for calculating coordinates of multiple contact points according to the present invention.

Referring to FIG. 11, the separation distance calculation unit 110 measures the Y-axis spacing and the X-axis spacing of the multiple contact points generated in the touch screen panel 1, respectively, as the resistance value of the first substrate 20 and the second distance. The calculation is based on the magnitude of the resistance value of the substrate 40. Referring to the separation distance calculation unit 110 in more detail, the separation distance calculation unit 110 is configured to include a resistance measuring unit 111, the search unit 113 and the determination unit 115. The resistance measuring unit 111 measures the magnitude of the resistance value of the first substrate 20 to determine the Y-axis separation distance of the multi-contact point, and determines the X-axis separation distance of the multi-contact point of the second substrate 40. Measure the magnitude of the resistance value. The searcher 113 spaces the Y-axis spacing and the X-axis spacing corresponding to the resistance value of the first substrate 20 and the resistance value of the second substrate 20 measured by the resistance measuring unit 111. Search in distance database 120. The determination unit 115 determines the searched Y-axis spacing and the X-axis spacing as the Y-axis spacing and the X-axis spacing of the multiple contact points, respectively.

The direction vector calculator 130 applies the driving voltage VDD to one terminal of the upper electrode or the lower electrode of the first substrate 20 and grounds the other end electrode to the left end electrode of the second substrate 40. The voltage is measured at the right electrode, and the direction vector of the multiple contact points is calculated in either the forward direction or the backward direction based on the measured voltage value. In another embodiment of the present invention, the direction vector calculator 130 applies the driving voltage V _DD to one of the upper electrodes or the right electrodes of the second substrate 40 and grounds the other electrode. By measuring the voltage at the upper electrode and the lower electrode of the substrate 20, the direction vector of the multiple contact points can be calculated in either the forward direction or the backward direction.

The center coordinate calculator 140 includes an X axis coordinate calculator 141 for calculating the X axis center coordinates of the multi-contact point and a Y axis coordinate calculator 143 for calculating the Y axis center coordinates of the multi-contact point. have. The X-axis coordinate calculation unit 141 applies the driving voltage V _DD to any one of the left end electrode and the right end electrode of the second substrate 40 and the X axis of the center coordinates of the multi-contact point while the other electrode is grounded. The center coordinates of the direction are calculated, and the Y-axis coordinate calculation unit 143 applies the driving voltage V _DD to any one of the top electrode or the bottom electrode of the first substrate 20 and multiplies the other electrode in the grounded state. Calculate the center coordinate in the Y axis direction of the center coordinate of the contact point.

The coordinate calculator 150 calculates the coordinates of the multi-contact point based on the X-axis and Y-axis distances of the multi-contact points, the direction vector of the multi-contact points, and the center coordinates of the multi-contact points. Calculate according to

12 is a view for explaining an example of applying the coordinate calculation method of multiple contact points according to the present invention.

Referring to an example of applying a method for calculating a coordinate of a multi-contact point according to the present invention with reference to FIG. ₁ , P ₂ ) and then change the position of the multi-contact point in the direction to enlarge the image to generate a new multi-contact point (P ₃ , P ₄ ) to change the position of the multi-contact point based on the coordinates of the multi-contact point This allows the user to input a user command to enlarge the image. In addition, when a plurality of images are separated from each other and displayed on a screen by using a PIP method, multiple images may be generated in an area corresponding to each of the separated images, and each image may be individually enlarged or reduced.

Looking at another example of applying the method of calculating the coordinates of the multi-contact point according to the present invention with reference to Figure 12 (b), to input a user command through a combination of a plurality of icons displayed on a device such as a mobile phone, PDA The user generates multiple touch points for selecting a plurality of icons on the touch screen panel, and recognizes a combination of the plurality of icons selected through the coordinates of the multiple touch points and inputs a user command.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.

The computer-readable recording medium may be an electronic or magnetic storage medium (eg, ROM, floppy disk, hard disk, etc.), optical reading medium (eg, CD-ROM, DVD, etc.) and carrier wave (eg Storage media, such as through the Internet).

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a view for explaining the configuration of a conventional single touch screen panel.

FIG. 2 is a diagram for describing a method of calculating coordinates of a contact point when a contact point occurs in the single touch screen panel illustrated in FIG. 1.

3 is a flowchart illustrating a method of calculating multiple contact point coordinates according to an embodiment of the present invention.

4 shows an example of a database for Y-axis spacing and X-axis spacing.

FIG. 5 is a diagram illustrating a resistance value of the first substrate 20 and the second substrate 40 when multiple contact points occur in a single touch screen panel.

6 illustrates an example of a state in which resistance values of the first substrate and the second substrate are changed according to the X-axis spacing and the Y-axis spacing of the multiple contact points.

7 is a circuit diagram for describing a method of measuring a resistance value of a first substrate.

8 is a view for explaining in more detail the step of calculating the direction vector of the multiple contact point according to the present invention.

9 is a view for explaining in more detail the step of calculating the center coordinates of the multi-contact point in accordance with the present invention.

FIG. 10 is a diagram for describing an example of a method of calculating the center coordinates of multiple contact points in more detail.

11 is a functional block diagram for explaining an apparatus for calculating the coordinates of the multiple point of contact according to the present invention.

12 is a view for explaining an example of applying the coordinate calculation method of multiple contact points according to the present invention.

Description of the main parts of the drawing

1: touch screen panel 10: insulating dot

20: first substrate 30, 50: optical transparent adhesive film

40: second substrate 110: separation distance calculation unit

120: database unit 130: direction vector calculation unit

140: center coordinate calculation unit 150: multi-contact point coordinate calculation unit

Claims (9)

1. A method of calculating coordinates of a contact point in a touch screen panel having a first conductive substrate having an upper electrode and a lower electrode formed thereon, and a second conductive substrate having a left electrode and a right electrode formed thereon; determining a vertical distance and a horizontal distance between the multiple touch points of the touch screen panel based on the resistance of the first substrate and the resistance of the second substrate; (b) calculating a direction vector of the multiple contact points and a center coordinate of the multiple contact points; And (c) calculating coordinates of the multi-contact point based on the calculated vertical and horizontal distances of the multi-contact point, the left-right distance, the center coordinates of the multi-contact point and the direction vector of the multi-contact point. Coordinate calculation method. The method of claim 1, wherein step (a) Measuring a resistance value of the first substrate and a resistance value of the second substrate; Calculating a vertical distance corresponding to the measured resistance value of the first substrate and a horizontal distance corresponding to the measured resistance value of the second substrate; And And determining the calculated up-down distance and left-right distance as the up-down distance and the left-right distance of the multi-contact point. The method of claim 2, The vertical distances corresponding to the measured resistance values of the first substrate and the horizontal distances corresponding to the measured resistance values of the second substrate are calculated by searching a database storing the separation distances corresponding to the resistance values. The coordinate calculation method of the multiple contact point characterized in that. 3. The method of claim 2, wherein the direction vector of the multiple contact points is The coordinate calculation method of the multi-contact point, characterized in that calculated in the forward direction and the backward direction according to the positional relationship of the multi-contact point. 5. The method of claim 4, wherein the direction vectors in the forward direction and the backward direction are Calculate based on the voltage difference measured by the upper electrode and the lower electrode of the first substrate, The coordinate calculation method of the multiple contact point, characterized in that calculated based on the voltage difference measured in the left and right electrodes of the second substrate. The method of claim 2, The vertical center coordinates of the multi-contact point is Calculating upper and lower upper center coordinates of the multi-contact point based on the voltage value measured at the right electrode of the second substrate; Calculating a lower center coordinate in the vertical direction of the multiple contact points based on the voltage value measured at the left electrode of the second substrate; And Calculating the center coordinates of the calculated top center coordinates and the bottom center coordinates as vertical coordinates of the multi-contact point; Left and right center coordinates of the multi-contact point is Calculating left and right left center coordinates of the multiple contact points based on the voltage measured at the upper electrode of the first substrate; Calculating left and right right center coordinates of the multi-contact point based on the voltage measured at the lower electrode of the first substrate; And And calculating the center coordinates of the left end center coordinates and the right end center coordinates as left and right center coordinates of the multi-contact point. The method of claim 2, wherein the coordinates of the multiple contact points are When the calculated direction vector of the multi-contact point is calculated in the forward direction, Subtract 1/2 of the distance in the vertical direction from the center coordinates of the multi-contact point and subtract 1/2 of the distance in the left and right direction based on the center coordinate of the multi-contact point to the first contact point coordinate of the multi-contact point. Calculate, Calculate the second contact point coordinates of the multi-contact point by adding the distance 1/2 in the vertical direction based on the center coordinates of the multi-contact point and adding the distance 1/2 in the left-right direction based on the center coordinate of the multi-contact point. The coordinate calculation method of the multiple contact point characterized in that. The method of claim 2, wherein the center coordinates of the multiple contact point is When the calculated direction vector of the multi-contact point is calculated in the backward direction, Calculate the first contact point coordinates of the multi-contact point by subtracting the distance 1/2 in the vertical direction based on the center coordinates of the multi-contact point and subtracting the distance 1/2 in the left-right direction based on the center point of the multi-contact point. and, Calculate the second contact point coordinates of the multi-contact point by subtracting the distance 1/2 in the vertical direction based on the center coordinates of the multi-contact point and adding the distance 1/2 in the left-right direction based on the center coordinate of the multi-contact point. The coordinate calculation method of the multiple contact point characterized in that. An apparatus for calculating coordinates of multiple contact points in a touch screen panel having an electrically conductive first substrate having an upper electrode and a lower electrode formed thereon, and an electrically conductive second substrate having an left end electrode and an right end electrode formed therein, A separation distance calculator configured to calculate a separation distance between the multiple contact points of the touch screen panel based on the resistance value of the first substrate and the resistance value of the second substrate; A direction vector calculator configured to calculate a direction vector of the multiple contact points according to the positional relationship of the multiple contact points; A center coordinate calculator configured to calculate center coordinates of the multiple contact points based on voltage values measured at the upper and lower electrodes of the first substrate and voltage values measured at the left and right electrodes of the second substrate, respectively; And And a coordinate calculator configured to calculate coordinates of the multi-contact point based on the calculated distances of the multi-contact points, intermediate coordinates of the multi-contact points, and direction vectors of the multi-contact points.

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