KR20090030906A - A method for determining multiple touch inputs on a resistive touch screen and a multiple touch controller - Google Patents

A method for determining multiple touch inputs on a resistive touch screen and a multiple touch controller Download PDF

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Publication number
KR20090030906A
KR20090030906A KR1020070096582A KR20070096582A KR20090030906A KR 20090030906 A KR20090030906 A KR 20090030906A KR 1020070096582 A KR1020070096582 A KR 1020070096582A KR 20070096582 A KR20070096582 A KR 20070096582A KR 20090030906 A KR20090030906 A KR 20090030906A
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South Korea
Prior art keywords
coordinate
coordinates
touch
circuit
point
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KR1020070096582A
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Korean (ko)
Inventor
펑즈 예
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제이 터치 코퍼레이션
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Priority to KR1020070096582A priority Critical patent/KR20090030906A/en
Publication of KR20090030906A publication Critical patent/KR20090030906A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F5/00—Methods or arrangements for data conversion without changing the order or content of the data handled
    • G06F5/06—Methods or arrangements for data conversion without changing the order or content of the data handled for changing the speed of data flow, i.e. speed regularising or timing, e.g. delay lines, FIFO buffers; over- or underrun control therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

Abstract

The present invention relates to a method for determining a multi-touch input to a resistive touch screen, wherein a first contact object and a second contact object are respectively contacted with the resistive touch screen. Determining a contact order; Calculating coordinates of a first point and coordinates of a midpoint by a voltage drop in the resistive touch screen while the first contact object is in contact with the resistive touch screen; And calculating the coordinates of the second point based on the coordinates of the first point and the coordinates of the midpoint.

Description

A method for determining multiple touch inputs on a resistive touch screen and a multiple touch controller}

The present invention relates to a touch system and a touch digitizer (Digitiger), and more particularly to a method of determining a multi-touch input in a multi-touch controller and a resistive touch screen.

In the 1970s, touchscreens began in the United States for military use. Until the 1980s, such touchscreen technology was known and widely used in other applications. Currently, the touch screen is an input method that can replace an input device such as a keyboard or a mouse, and is being used worldwide. In particular, the touch screen technology applied to most of electronic products such as ATM (Atomatic Teller Machine), kiosks (Points of Service), home appliances, industrial electronics, etc. is widely used in many fields, such touch screen An input method such as this facilitates an interface with a user at the time of input. In addition, according to the needs of consumers, input type electronic products such as touch screens, such as PDAs, mobile phones, laptops, laptops, MP3 players, etc., are becoming lighter, thinner, smaller and lighter.

Resistive touchscreens are inexpensive and dominate the world market. This resistive touchscreen consists of a soft top layer and a hard bottom layer separated by insulating dots on the inner surface of each layer coated with a transparent metal oxide. When pressure is applied to the flexible top sheet, electrical contact is made between the resistive layers, which act as switches in the circuit. The controller controls the X and Y coordinates of the object in contact with the screen by alternating the voltage between the layers. However, the resistive touch screen has a problem in that it has a big disadvantage when performing a multi-touch function. For example, when a user touches a point A and a point B on the screen using two fingers, the soft top layer is in contact with the hard bottom layer on the line comprised between points A and B. Because of this, when detecting a midpoint, the midpoint is detected and determined on the line rather than by the exact point A or B the user wants to create.

As mentioned above, a disadvantage of the resistive touch screen is required to improve the counterpart of the multi-touch function in electronic products. Accordingly, an object of the present invention is to provide a multi-touch controller applied to a multi-touch screen and to provide a method for determining a multi-touch input on a resistive touch screen.

In one embodiment of the present invention, the coordinate of the second point is calculated on the resistive touch screen according to the coordinate of the preceding point and the coordinate of the midpoint, and at the same time the preceding point is contacted with the resistive touch screen. The first point, and the midpoint is the point between the preceding point and the second point.

According to another embodiment of the present invention, the coordinates of the second point are calculated on the resistive touch screen according to the coordinates of the preceding point and the coordinates of the center point and the vector, and at the same time, the vector also has the coordinates of the preceding point. It calculates based on the coordinate of the said midpoint.

In order to achieve the above-mentioned feature, the present invention provides a method for determining a multi-touch input to a resistive touch screen, wherein the first contact object and the second contact object respectively contact the resistive touch screen. Determine the contact order between the first contact object and the second contact object, and the first contact object is in contact with the resistive touch screen and at the same time the coordinates and the midpoint of the first point according to the voltage drop in the resistive touch screen. The present invention provides a method of determining a multi-touch input in a resistive touch screen including calculating coordinates and calculating coordinates of a second point according to the coordinates of the first point and the coordinates of the midpoint.

In addition, the present invention provides a multi-touch controller applied to the resistive touch screen, the multi-touch controller is at least one first-in first-out for storing a set of coordinates having an X axis coordinate and a Y axis coordinate in the resistive touch screen ( FIFO) buffer; A touch sensing circuit for outputting a control signal, determining whether there are other contact points, determining whether it is larger than a threshold value, and accessing a first-in first-out buffer; A touch mode switching circuit for receiving a control signal from the touch sensing circuit to determine a state of the touch mode switching circuit; A coordinate generation circuit for accessing states of the first-in first-out buffer, coordinate selection circuit and the touch mode switching circuit to obtain values of the X-axis and the Y-axis; A coordinate register for storing X and Y axis values transmitted from the coordinate generation circuit; A coordinate selection circuit for calculating a coordinate value of the second point and querying the first-in first-out buffer and the coordinate register at the same time; A center calculation circuit for calculating the multi center points between the multi contact points on the touch screen; The present invention provides a multi-touch controller, comprising: a coordinate non-converter for transmitting a signal to the touch mode switching circuit and determining whether any contact is released.

The present invention provides a method for determining a multi-touch input to a multi-touch controller and a resistive touch screen, which is simple in design, simple in principle, and has effects such as cost reduction and re-design off. Can be.

The present invention relates to a method of determining a multi-touch input to a resistive touch screen, some embodiments of which are described with reference to FIGS. 1A to 5C. It can be understood with the description set forth below by providing various various embodiments for carrying out various features of the invention. Specific examples of components and arrangements have concise the description set forth herein. Of course, the embodiments disclosed in the present invention are not intended to limit any way. In addition, reference numerals and terms of various embodiments described in the present invention may be repeated. This repetition is for the purpose of briefly and clearly describing the present invention and does not in itself dictate a relationship between the various embodiments and configurations described herein.

The present invention relates to a method and a multi-touch controller for determining a multi-touch input to the resistive touch screen, to be described in detail with reference to the accompanying Figures 1a to 5c.

As shown in Figs. 1A-1C, it is a schematic diagram illustrating the calculation of coordinates based on a preceding point according to an embodiment of the present invention. Referring to FIG. 1A, the preceding point P1 is determined when the finger is in contact with the resistive touch screen. Referring to FIG. 1B, the midpoint Pm is determined to detect a discontinuous voltage drop between the preceding point P1 and the second point P2 as shown in FIG. 1C. The second point P2 refers to contact with the resistive touch screen by another finger after the preceding point P1 is contacted. As mentioned above, the multi-touch controller receives two coordinates of points P1 (X1, Y1) and Pm (Xm, Ym) and calculates the coordinates of the second point P2 (X2, Y2) through a vector. The vector is also calculated by P1 (X1, Y1) and Pm (Xm, Ym).

As shown in Figs. 2A-2E, it is a schematic diagram showing the calculation of coordinates based on a preceding point according to another embodiment of the present invention. Here, a description will be given when three touch inputs are made to the resistive touch screen. First, provide a resistive touch screen, determine the contact order between P1, P2, P3 (for example, the contact order is P1, P2, P3), and coordinates of P1 and Pm1 on the same principle as described above. Is received, calculates the coordinates of P2 based on the coordinates of P1 and Pm1, receives the coordinates of Pm2, calculates the coordinates of P3 based on the coordinates of Pm1 and Pm2.

Through the above-described principle, the principle is that a leading point is determined when only one first contact (eg thumb) touches the screen and another finger (eg forefinger) after the first contact. The center of gravity is determined by the discontinuous voltage drop when contacting the resistive screen. The next point is then sequentially calculated to receive the final emphasis. That is, assuming that n-1 points are in contact with the resistive screen at the same time, the midpoint Pm n -2 is present. Then, the nth point Pn is brought into contact with the screen, and Pm n −1 becomes the center point between Pn and Pm n −2 . Since the points Pm n -1 and Pm are sequentially searched for the resistive touch screen, the points Pn can be calculated based on Pm n -1 and Pm. Generally speaking, determine the order of contact between N points (e.g., P1, P2, P3, ..., Pn), and search the coordinates of Pm1, Pm2, Pm3, ..., Pm n -1 to find Pm1. Calculate the coordinates P2, P3, ..., Pn according to, Pm2, Pm3, ..., Pm n -1 .

As shown in FIG. 3, FIG. 3 is a flowchart illustrating determining a multi-touch input on a resistive touch screen according to an exemplary embodiment of the present invention.

Step S11: Start step.

Step S12: Internal circuit for initialization of each function block, initialization of coordinates.

Step S13: Search whether the resistive touch screen has been touched, and if yes, perform step S14, and if no, perform step S13.

Step S14: Receive the coordinates of the first point (leading point) and start a single point search.

Step S15: search whether a discontinuous voltage drop has occurred, which means that the second contact is simultaneously maintaining contact with the resistive touch screen; If yes, step S16 is performed. If no, step S14 is performed.

Step S16: Determine whether a single point on the resistive touch screen is the only point; If yes, step S13 is performed. If no, step S17 is performed.

Step S17: Start a multi-point search and calculate each point, midpoint and vector contacted according to the preceding point.

Step S18: Determine whether a discontinuous voltage drop has occurred. This means that a third contact is in contact with the resistive touch screen; If yes, step S14 is performed. If no, step S17 is performed.

In addition, the equation for calculating the next point based on a known point on the X-axis is:

1st point: X 1 = NEW x ;

Second point: X 2 = [(NEW x -mid x1 ) * 2] + mid x1 , above mid x1 = X 1 ;

3rd point: X 3 = [(NEW x -mid x2 ) * 2] + mid x2 ,

               Above midx2 = [(X2 -midx1) / 2] + midx1 ;

4th point: X 4 = [(NEW x -mid x3 ) * 2] + mid x3 ,

Above mid x3 = [(X 3 -mid x2 ) / 2] + mid x2 ;

5th Point: X 5 = [(NEW x -mid x4 ) * 2] + mid x4 ,

The mid x4 = [(X 4 -mid x3 ) / 2] + mid x3 ;

In conclusion, the following equation can be derived:

X 1 = NEW x , mid x1 = X 1 when,

X n = [(NEW x -mid x (n-1) ) * 2] + mid x (n-1) ,

Mid x (n-1) = [(X n -1 -mid x (n-1) ) / 2] + mid x (n-1)

The Y-axis, like the X-axis, can be derived as follows:

Y 1 = NEW y , mid y1 = Y 1 when,

Y n = [(NEW y -mid y (n-1) ) * 2] + mid y (n-1) ,

Mid y (n-1) = [(Y n -1 -mid y (n-1) ) / 2] + mid y (n-1)

As shown in FIG. 4, FIG. 4 illustrates a functional relationship diagram of a multi-touch controller for a resistive touch screen according to another embodiment of the present invention.

The multi-touch controller has a resistive touch panel 21 is connected to the analog to digital A / D converter 22, the A / D converter 22 is connected to the first-in first-out (FIFO) buffer 23 The first-in, first-out (FIFO) buffer 23 is connected to the contact sensing circuit 24 and to the coordinate generation circuit 26, the contact sensing circuit 24 is connected to the coordinate non-intersection path 30, Coordinate inversion path 30 is connected to the touch mode switching circuit 25, the touch mode switching circuit 25 is connected to the coordinate generation circuit 26, coordinate selection circuit 27 and the coordinate register 28 The coordinate selection circuit 27 is connected to the coordinate generation circuit 26 and the midpoint calculation circuit 29, the coordinate generation circuit 26 is connected to the coordinate register 28, and the coordinate register ( 28 is connected to the I 2 C interface bus 31, and the midpoint calculation circuit 29 is connected to the coordinate non-intersection 30.

The resistive touch panel 21 transmits an analog signal to the A / D converter 22 to convert the analog signal into a digital signal, and the A / D converter 22 first-in, first-out coordinates of the X-axis and the Y-axis. Transfer to buffer 23. The first-in, first-out buffer 23 includes two columns that store two sets of coordinates of points at times t and t + 1. When the difference between the coordinates of point t and t + 1 is larger than a predetermined value, it is in contact with two objects on the screen and the touch sensing circuit 24 transmits a status signal to the touch mode switching circuit 25. It means to check the status change. In the meantime, the coordinate generation circuit 26 controls the state of the touch mode switching circuit 25, the coordinates of the first-in first-out buffer 23, and the coordinate register 28 accessed by the coordinate selection circuit 27. Calculate the coordinates of the new point according to the coordinates. The X and Y axis values stored in the coordinate register 28 are output by the I 2 C interface bus 31. The midpoint calculation circuit 29 transmits information to the coordinate intersection 30 in order to calculate each midpoint, and to determine if a point has been released. The coordinate register 28 may be a left-shift register or a right-shift register to store the coordinates of the point. In this embodiment, the coordinate register 28 can store three coordinate sets, but can store more coordinate sets than that, and there is no limitation.

5A and 5C, FIGS. 5A and 5C illustrate functional relationship diagrams of a multi-touch controller showing signal transmission between blocks showing several functions according to another embodiment of the present invention.

In FIG. 5A, the coordinate values are transmitted from the first-in first-out buffer 23 to the touch sensing circuit 24 and the coordinate generation circuit 26 for coordinate calculation. At the same time, the coordinate values are transmitted from the coordinate register 28 to the midpoint calculation circuit 29 in order to calculate the coordinates of the current point in the coordinate selection circuit 27.

In FIG. 5B, the coordinate intersection 30 determines whether any point has been released according to the information provided by the midpoint calculation circuit 29 and provides the information to the touch mode switching circuit 25 for state change. do. The coordinate selection circuit 27 selects a corresponding coordinate according to a signal from the touch mode switching circuit 25 to the coordinate generation circuit 26.

In FIG. 5C, the coordinate generation circuit 26 generates the correct coordinates of the new point according to the information of the first-in first-out buffer 23 and the coordinate selection circuit 27. The touch mode switching circuit 25 selects a corresponding output to the coordinate register in order to refresh the new coordinate. The new coordinates are then output by an I 2 C interface bus 31 or a Serial Peripheral Interface (SPI).

Method for determining multi-touch input to a multi-touch controller and a resistive touch screen according to the present invention, or the shape and part according to the embodiment according to the embodiment is a floppy disk, CD-ROMS, hard drive, firmware, or a machine-readable storage device It may be in the form of program code (eg, instructions) embodied on media such as ancillary means. When the program code is loaded and executed by a machine, such as a computer, the machine becomes an apparatus that can be put to practical use as disclosed in the present invention. The apparatus and method of the present invention may also be embodied in the form of program codes transmitted over a plurality of transmission media, such as via electric wires, cables or optical fibers or another transmission medium, wherein the program codes are downloaded and When executed by the same machine, the machine may be embodied in conjunction with the teachings disclosed herein. When executed in a versatile process, the program code, in conjunction with the processor, acts similarly to specific logic circuits to provide a unique device.

The invention is described in the features of the appended claims. However, a more complete understanding of the invention, when considered in conjunction with the drawings, will be obtained by reference to the description and claims, wherein like reference numerals indicate similar items throughout the figures.

The examples proposed in the present invention illustrate one form of embodiment in which the present invention is preferred and these examples are not intended to limit in any way.

1A to 1C are schematic diagrams of coordinate calculations based on preceding points in an embodiment according to the present invention.

2A to 2E are schematic diagrams of coordinate calculations based on preceding points according to another embodiment according to the present invention.

3 is a flowchart illustrating determining a multi-touch input on a resistive touch screen according to an embodiment of the present invention.

4 is a functional relationship diagram of a multi-touch controller for a resistive touch screen according to another embodiment of the present invention.

5A to 5C are functional relationship diagrams of signal transmission between signals showing some functions according to still another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

21: Touch panel 22: A / D converter

23: FIFO buffer 24: touch sensing circuit

25: touch mode switching circuit 26: coordinate generation circuit

27: coordinate selection circuit 28: coordinate register

29: key calculation circuit 30: coordinate coordinate church

31: I 2 C interface bus

Claims (20)

In the method of determining a multi-touch input to the resistive touch screen, Determining a contact order between the first contact object and the second contact object when a first contact object and at least one second contact object each contact the resistive touch screen; Calculating a coordinate of a first point and a coordinate of a midpoint by a voltage drop on the resistive touch screen while the first contact object is in contact with the resistive touch screen; And calculating the coordinates of the second point based on the coordinates of the first point and the coordinates of the midpoint. The method of claim 1, Determining the contact order is performed by a first-in-first-out (FIFO) buffer. The method of claim 2, Transmitting the first point coordinate and the midpoint coordinate to a touch sensing circuit and a coordinate generation circuit; And And storing the first point coordinates and the midpoint coordinates in a coordinate register. 4. The method of claim 3, further comprising transmitting the coordinates of the first point and the coordinates of the midpoint from the coordinate register to a midpoint calculation circuit and a coordinate selection circuit. The method of claim 4, wherein Determining whether any other touch input is made by a coordinate comparison circuit according to the result of the key calculation circuit; Transmitting a signal state by a touch mode switching circuit; And And transmitting a corresponding coordinate value to the coordinate generation circuit according to the state signal. The method of claim 5, The coordinate generation circuit calculates the coordinates of the second point according to the results of the first-in first-out (FIFO) buffer and the coordinate selection circuit, and the touch mode switching circuit transmits the coordinates of the second point to the coordinate register. And outputting the coordinates of the second point by an interface bus. The method of claim 6, Wherein the interface bus is an I 2 C interface bus or a Serial Peripheral Interface (SPI). The method of claim 2, The first-in first-out (FIFO) buffer can store two sets of coordinates having an X axis and a Y axis. The method of claim 2, And wherein the FIFO buffer can store more than two sets of coordinates having an X-axis and a Y-axis. The method of claim 3, wherein The touch sensing circuit is used to access a value in the first-in first-out buffer, determine whether it is larger than a threshold value, determine whether there are other touch points, and output a control signal. How to determine multi-touch input. The method of claim 10, And wherein the touch mode switching circuit is used to receive the control signal from the touch sensing circuit to determine a state of the touch mode switching circuit. The method of claim 4, wherein And the coordinate generation circuit is used to access the state of the touch mode switching circuit by obtaining the first-in first-out buffer, the coordinate selection circuit, the X-axis and the Y-axis values. The method of claim 3, wherein The coordinate register is a method for determining a multi-touch input, characterized in that for storing the values of the X-axis and Y-axis transmitted from the coordinate generation circuit. The method of claim 3, wherein And the coordinate selection circuit can query the coordinate register and the first-in first-out buffer at the same time and calculate a coordinate value of the second point. The method of claim 4, wherein And the center calculation circuit is capable of calculating multiple center points between the multi touches on the resistive touch screen. The method of claim 5, And determining whether the coordinate non-intersection path is in contact with and whether or not a signal is transmitted to the touch mode switching circuit. In the multi-touch controller applied to the resistive touch screen, At least one first-in first-out (FIFO) buffer for storing a set of coordinates having an X axis and a Y axis in the resistive touch screen; A touch sensing circuit for accessing the first-in, first-out buffer, determining whether it is greater than a threshold value, determining whether it is greater than two touch points, and outputting a control signal; A touch mode switching circuit for receiving a control signal from the touch sensing circuit to determine a state of the touch mode switching circuit; A coordinate generation circuit for accessing the states of the first-in first-out buffer, coordinate selection circuit and the touch mode switching circuit to obtain values of the X-axis and the Y-axis; A coordinate register for storing values of X and Y axes transmitted from the coordinate generation circuit; A coordinate selection circuit for querying the coordinate register and the first-in first-out buffer at the same time and calculating a coordinate value of the second point; A midpoint calculation circuit for calculating a plurality of midpoints between the multiple contacts in the resistive touch screen; And And a coordinate non-converter for determining whether there is any contact with the resistive touch screen and transmitting a signal to the touch mode switching circuit. The method of claim 17, The coordinate value having the X-axis and the Y-axis is output by the interface bus. The method of claim 18, The interface bus is an I 2 C interface bus or a serial peripheral interface (SPI: Serial Peripheral Interface), characterized in that the multi-touch controller. The method of claim 17, Wherein the coordinate register is a left-shift register or a right-shift register.
KR1020070096582A 2007-09-21 2007-09-21 A method for determining multiple touch inputs on a resistive touch screen and a multiple touch controller KR20090030906A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105183266A (en) * 2015-09-18 2015-12-23 合肥工业大学 Multi-point resistive touch screen structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105183266A (en) * 2015-09-18 2015-12-23 合肥工业大学 Multi-point resistive touch screen structure

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