WO2008148307A1 - Method for identifying multiple touch points on an infrared touch screen - Google Patents

Method for identifying multiple touch points on an infrared touch screen

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Publication number
WO2008148307A1
WO2008148307A1 PCT/CN2008/001095 CN2008001095W WO2008148307A1 WO 2008148307 A1 WO2008148307 A1 WO 2008148307A1 CN 2008001095 W CN2008001095 W CN 2008001095W WO 2008148307 A1 WO2008148307 A1 WO 2008148307A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
touch
infrared
tube
receiving
step
Prior art date
Application number
PCT/CN2008/001095
Other languages
French (fr)
Chinese (zh)
Inventor
Xinlin Ye
Jianjun Liu
Xinbin Liu
Original Assignee
Beijing Irtouch Systems Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/048Indexing scheme relating to G06F3/048
    • G06F2203/04808Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen

Abstract

A method for identifying multiple touch points on an infrared touch screen. The method including: getting a plurality of possible touch points by using grid-shaped scanning firstly, and then eliminating the pseudo-touch point from the possible touch points by using off-axis scanning, finally getting the coordinate of the accurate touch points. The method achieves a goal that detects multiple touch points without changing the structure of the current infrared touch screen.

Description

A method for identifying a multi-touch screen, infrared touch points Field

The present invention relates to a touch device technology, and particularly relates to a method for infrared touch screen multi-touch recognition. Background technique

As a branch of computer touch screen, infrared touch screen with its advantages easy installation, maintenance, high antiknock properties, and high reliability while increasingly widely used in various fields. Even after 20 years of development, there are numerous technical improvements, such as Application No. 95105303.5, 00121462.4, etc. Chinese patent application or published content. But the basic technical solutions infrared touch screen technology is still limited to US patent 3,764,813, 3,775,560, 3,860,754 and other patents disclosed. But these technical content, are far from played out infrared touch screen can reach the technical level, all of the touch detection can only detect a single touch point. With advances in computer software and hardware technology, computer already has a more powerful, more and more used in almost any field we can imagine, then for different applications, sometimes more multi-touch technology It enables users to easily operate a computer, or for specific software, multi-touch technology more efficient. But this requires a touch screen supports multi-touch, can detect more than one touch point.

Current detection technique for infrared touch screen a plurality of touch points, Chinese Patent Publication No. CN101071356A disclosed a multi-touched points to content located by scanning an infrared transmitter circuit sets a corresponding infrared receiver scanning circuits, which patent is by changing the structure of the conventional infrared touch screen is a multi-touch point positioning, which is not compatible with the prior art infrared touch screen, resulting in such identification technique does not practically applicable prospect; Further, Patent Publication No.'s WO2008039006A1 It discloses a transmission-reception light level of the maximum acceptable level of the light is blocked when the tube unobstructed to determine the content of the multi-touch compared by measuring the infrared, since the form of a tube of infrared emitting infrared touch screen preclude receiving tube, and therefore, when the infrared measuring light is blocked is determined, it is easy to obtain false touch point, the patent will have a great error recognition rate; others such as

JP2007065767, JP2006011568, US2008097991AK US2008088593A1 patent applications disclose several multi-touch recognition of the technical solutions, but these solutions can not be applied to infrared touch screen. SUMMARY

For the shortcomings of conventional infrared touch screen, object of the present invention is to provide an infrared touch screen can recognize multi-touch, the method is applied In an infrared touch screen, the infrared touch screen includes: arranged along the touch area four weeks infrared transmitting and receiving tube array, turning on the infrared emission tube and the receiver tube accessory circuit and a control circuit and storing said calculated microcontroller system for transmitting the detected data, the method comprising the steps of:

A: Start infrared touch screen, in accordance with the selection order of each infrared emitter is turned on and the receiver, to scan the entire touch region;

B: recorded and stored every time infrared rays are blocked infrared transmitting and receiving sequence number or address value of the tube;

C: then determine the single-point touch or multi-touch, if a single touch directly proceeds to step E, if it is multi-touch, to the next step D;

D: selecting the infrared rays are blocked infrared emission tube receiving position in space adjacent to or near, the light-emitting different shaft axis and off-axis scanning receiver tube;

E: transmitting a serial number or address values ​​to the infrared receiving tube is recorded and stored, and the calculated coordinate value of the touch point;

F: The coordinate value of the output point to a real touch of infrared touch screen apparatus which is installed. Off-axis scanning infrared emitter and receiver tube are selected embodiment according to Step D: In the light rays is cut off by receiving the infrared emission center, selection number or an address adjacent to the infrared transmitting and receiving tube pipe.

Prior to procedure D, further comprising the step of: transmitting and receiving a serial number or address value tube according to step B is blocked infrared recording, each possible combination of touch points obtained. Step D is the off-axis scanning infrared transmitting and receiving tubes selection method may also be: to each of the possible touch point as the center, and do not at least one other possible touch points a straight line intersecting the straight line selection penetrating, two touch screen mounted on opposite sides, with the cut off of the light transmitting and receiving infrared spatial position in the tube adjacent to or near the launch tube and the receiver tube.

Step D, the off-axis scanning comprising the steps of:

S1: i-th order is blocked only infrared emission corresponding to the i-th infrared receiving tube only as the center, a serial number or address for sequentially turned im, im + 1 i- 2, i-1, i, i + 1, i + 2 i + ml, i + m in the presence or infrared receiver sequence number received Tubing real address, receiving only the i-infrared emission of infrared rays emitted; or conversely, a serial number or address for sequentially turned present im, im + 1, i-2, il, i, i + l, i + 2, ......, i + ml, i + m number of infrared emission in a real launch tube or address, by the first i infrared receiving tube only receives the infrared strobed sequentially emits infrared rays emitted by the tube, where m is a natural number is set, step B i is recorded infrared rays are blocked infrared transmitting and receiving sequence number or address value of the tube;

S2: Is there a transmission and reception process of step S1 detecting infrared rays are blocked, infrared rays are blocked if not, it returns to step S1; if infrared rays are blocked, then proceeds to step S3;

S3: Record and store the serial number or the address value of the transmission tubes and reception tubes of the longitudinal and lateral directions corresponding to the infrared rays are blocked;

S4: then returns to step S1, until all blocked by the infrared receiving scanning infrared emission tube. Step S1 of the natural number m ranges: 10> m> 2. BRIEF DESCRIPTION

1 is a schematic general principles of the present invention a plurality of touch point recognition;

FIG 2 is a flowchart illustrating the main routine of the plurality of touch point recognition of the present invention;

3 is a flowchart of the present invention a plurality of touch point identification of off-axis scanning method of one embodiment;

FIG 4 is scanned off-axis shown in FIG. 3, a flowchart of the main program;

5 is a flowchart of the present invention, a plurality of touch points identified off-axis scanning another embodiment;

FIG 6 is a schematic diagram of the present invention a plurality of touch point recognition principle. detailed description

The following examples serve to illustrate the present invention but are not intended to limit the scope of the present invention.

FIG 1 will now be given substantially the basic structure of the infrared touch screen mounting structure in general, the basic method of mounting structure according to the present invention is also applicable to infrared touch screen. As shown, the touch screen is mounted by the touch detection area (typically a computer display, a projector screen, a display area) 101 around the tube array 102 of infrared emission, infrared receiver array 103 composed of a rectangular touch panel. Wherein the infrared transmitter and receiver, may be the same as conventional infrared touch screen structure, the same number, and constitute a one-infrared transmitting and receiving on the tube; launch tube and may be set to the number of different receiver tube. However Aims uniform resolution using an equal number of pipe structure is best. Here it is in the "on tube" structure based on the contents described embodiment of the method of the present invention.

Suppose there are two touch objects (solid line circle in the drawing) 107 and 109 within the scanning area of ​​the touchscreen detects such a structure, respectively, the characters B, D is represented, when the transmitting and receiving infrared scan touch area on the tube, respectively have at least two pairs of tubes (depending on the size of the touch object size, on the tube may be more larger, assumed here to illustrate the principles of two) in the horizontal and vertical infrared rays will be blocked between. Thus, the transmit and receive the flow tube array scanning as shown in Figure 2: Suppose the longitudinal direction, two pairs of pipe number for a light is blocked and B; number two pairs of tubes are blocked in the transverse direction, of the light ( : and <1 this is equivalent to the transmission and reception of the serial number on the tube, or transmitting and receiving the internal coordinate system of tubes XOY microcontroller scans the address coordinates in the unit of measure, will appear in the longitudinal direction and 13 two touch objects coordinate values, coordinate values ​​of c and d of the two touch objects will appear in the transverse direction. these four coordinate values ​​in combination, can be obtained a (c, a), B (c, b), C (d, b), and D (d, a) was touched four possible positions, i.e. four possible touch points, but the touch screen inside the microcontroller can immediately determines which of the four touch points because the combination of the coordinates generated false touch point, which is the actual touch point exists, it is also necessary to other methods excised false touch point, the touch point to obtain real. in FIG. 1, a pseudo-touch points are indicated by a dashed circle A. points 106 and 108. FIG point C, the infrared emission emitted by Arrow line 104 indicates, is blocked by the infrared-touch dashed arrows 105 represent.

At this time, you can start scanning the core of the present invention - the off-axis scanning. When using horizontal and vertical scan of the method of detecting a touch screen, touch both vertical and horizontal directions was not at least two barrier infrared transmitting and receiving between the tubes on, but also between the tubes of the non-infrared "off-axis" is stop. The so-called off-axis scanning, is emitted by an infrared receiving tube to transmit infrared launch tube, while another pair is transmitted by receiving a tube receiving tube to receive infrared rays. Because the optical axes of the two phase separation tube, not a same optical axis, and therefore off-axis scanning as defined in the present invention. 5, the touch screen are generally infrared emission infrared light emitting diode, an infrared light emitting diode which is not emitted bundle of concentrated, but distributed in a tapered region of the optical axis as its center, Accordingly receiver tube within a predetermined range deviates from the axis of the light emitting tube, it can receive the photo signal strength sufficient enough to be detected is derived, and therefore off-axis detection (or scan) are possible. Of course, in this case have certain requirements for the distance between the launch tube and the receiver tube, the angle required according to the product manual, factors such as the size of the touch screen, or the position of maximum deviation allowed is determined by experiments. But for the general size of the touching object and the touch-screen, typically in the case of several tube departing bit (the mounting position of the pipe), and it can detect the photo signal obtained off-axis.

Figure 2 shows a flowchart of the entire program is detected, the corresponding main steps above. Step 201 is a step of detecting the start, step assay procedure, and then enter the scan 202; step 203 is determined by detecting infrared rays is determined whether there is a barrier between the pair of tubes, if no infrared rays are blocked, after completion of a scan cycle returns when the scan control section to continue controlling the respective transmitting and receiving tubes to scan the entire touch region for, when detecting an object blocks the infrared rays, recorded and stored every time infrared rays are blocked infrared transmitting and receiving sequence number or address values ​​to the tube; then proceeds to decision step 204, it is determined in the longitudinal and transverse total between respective pairs of infrared tube is blocked, if only the infrared between a pair of pipe is blocked in one direction, it is determined that a single touch; conversion into the calculating step 205, the touch screen according to the installation requirements of the computer system, converting the calculated coordinates of the touch point of the interior becomes a coordinate value in a specified format, by connecting the output port to the computer system, then returns to step 202; if in a certain direction than one pair of between the light pipe is blocked, it is regarded The multi-touch, and then proceeds to step 206, the address or number of tubes, to obtain a plurality of possible touch point coordinate value combinations, for example, in FIG. 1 A, B, C, D points stored in accordance with the infrared rays are blocked. Then proceeds to step 207 to start the off-axis scanning. After obtaining the results of off-axis scanning proceeds calculation step 208 is determined, the coordinates of the touch point is determined inside the compositions obtained, which are true touch points, bound by false touch points. Finally, another example of the process of step 205 handles real coordinate values ​​of a touch point, and by connecting the output port to the computer system. After completion of these steps, then control returns to the scanning step 202, detection of start of the next scan. In the embodiment wherein the embodiment 1, since the number or address to emit the infrared rays are blocked i received on the tube according to the off-axis scanning start, it is judged at step 204 after the plurality of tubes are blocked, you can skip steps 206, an off-axis scanning start directly, eliminating the need for a step to obtain a plurality of calculated coordinate values. In Example 2, however, since the off-axis scanning approach is based on each possible combination of touch points obtained as the center, so the above respective steps are required there.

Because the principle of infrared touch screen technology has already started to disclose the detection, determination, computing technology and programming content is the content of mathematical calculations, it is no longer described in detail herein.

Example 1. FIG.

In an embodiment of the present invention, with the selection being cut off infrared emission light receiving position in space launch tube adjacent or near the off-axis scanning and a receiving tube may be two ways. As a first flowchart shown in FIG. 3, to be selected to the transmitting and receiving infrared light cut off for the center tube, but the sequence number or an address adjacent light emitting different shaft axis and off-axis scanning receiver tube. 1 to FIG combination obtained touched point D (a, d) Example: Suppose in the longitudinal direction, the infrared rays are point number or address of the tube is blocked D i, where i = d, then the number can be selected separately or address il, i, launch tube emits infrared i + 1 of each launch tube when said infrared emitter, respectively, can then select the number or address of i-2, il, i, i + l, i + 2 is receiving tube receiving. As can be seen in Figure 1, because the touch point D is real, and therefore from the il → i + l, i + l → il infrared blocked completely; il → i, i + l → i, and i → il , i → i + l infrared partially blocked. At this point it can be determined that D is an actual touch point. The point C, which is blocked because the present point C i → il, i → i + l and il → i + 2, i + l → i-2 among infrared rays has not been blocked, then the point is a C false touch points. This is only the use of emission of the tube longitudinally aligned to receive detected, it can also be used to transmit laterally arranged pipe receiving detected again, which is a further confirmation of which is a pseudo real touch point. Other possible touch points A, B, C, this same method to determine the true fact, the geometrical basis of this intersection point detection method for solving the linear equation. Because the entire touch screen, transmitting and receiving all positions are known and the tube in a coordinate system fixed in the XOY, any one transmitting straight line equation (IR) between a receiving tube is a tube has any known, then the coordinate values ​​of all the intersection between these lines will Pat are known and understood in accordance with the principles of geometry, there are non-parallel between the line and the plane has an intersection point. If these two straight lines or a plurality of straight lines cut together (infrared rays are blocked), then the point of intersection of the barrier necessarily straight two or more points. Scan If the touch screen is only a direction (vertical direction shown in the drawing, for example), then the above method would be able to detect the exact position of the touch point in the Y direction and approximate position in the X direction; however, the touch screen has another direction (as shown in FIG lateral) scanning detector, can be obtained as described above at a substantially precise location of the touch point position in the Y direction and X direction. Thus, infrared touch screen can accurately obtain the position of each touch point, but not limited to a touch point. Corresponding to Figure 3, that is, step 207 in FIG. 2 More specifically, in step 301 Alternatively, step 208 in FIG. 2 step 302 Alternatively, the scanning step 202 and returns to FIG. 2.

To more clearly illustrate a first embodiment of an off-axis scanning method of the present invention, first assumed that the maximum number of transmitting and receiving tube is N (here only be described in accordance with the arrangement order number in ascending order of transmitting or receiving scanning tube, transmitting and receiving tube address, a serial number may be converted; and seen from the structure of the infrared touch screen, other arrangements can also be converted into regular ascending sequence number). Working Example of the present process uses an off-axis scanning method of infrared touch screen is as follows: the microcontroller according to the serial number in numerical order strobe infrared emission tube, to emit infrared light. When each of the gate after a serial number i of the launch tube, the sides of the launch tube infrared receiving tube for receiving the tube with said selected paired through the launch tube as the center, the microcontroller successively with gating said receiving tube adjacent to the actual existence of only a few number of off-axis and coaxially receiving tube to receive infrared rays emitted from the launch tube. Tubing is assumed that in addition to receiving the transmitter paired with outside, the number of the receiving tube are sequentially gated is 2m, were number j microcontroller sequentially receiving tubes were gated ·. J = im, i-m + 1

i-2, il, i, i + l, i + 2 i + ml, i + m. Where m is a natural number set value may be based on the length of the response time of the touch screen and the size requirements: m value, high precision, the scan cycle is long, the response speed is slow, whereas m is small, the scanning period is short, the response fast. Thus generally take m = 2 ~ 10, i.e. 10≥m≥2. When paired with i launch tube receiving tube located at the edge of the touch area may be above certain serial number does not exist: for example, when i = 1, has been received or emitted most edge of the tube, im, i- m + 1 i-2, ί-1 receives the tube does not really exist; in time i = N, i + l, i + 2 i + ml, i + m not exist, in which case , since it is unnecessary to consider any touch point other than the edge of the screen, so the use of half the number i of the side transmitting and receiving tubes, and according to the aforementioned method and a transmitter and receiver geometry and the mathematical relationship between the tubes can still judged true touch points. In the middle of the scanning process, the starting tube and the tube terminating in the other direction in one direction, but also the above-described case. Scanning the entire testing process, all of the infrared emitting and receiving tubes are in accordance with the above rules to be gated until i = N, the completion of a scan of the touch area.

The above-described off-axis scanning detection principle 4 of the invention described below in detail in conjunction with FIG. FIG. 4 shows a program flowchart of off-axis scanning, the program flow is not fully shown in FIG. 2 corresponds to the main routine, here merely in order to explain the above-described detection principle of off-axis scanning, if embedded in Figure 2 in the main routine shown directly transferred from the main routine shown in FIG. 2 step 402 and the completion of all block infrared infrared transmitter after receiving an off-axis scanning tube, back to the main routine shown in FIG. 2 , where the modifications and variations embedded in the main routine shown in FIG. 2 made in the program shown in FIG. 4, those skilled in the art can understand and to practice. Wherein step 401 is a step of detecting the start, step assay procedure, and then enter the scan 402, the selected number sequence i of the infrared emitting tube. Then proceeds to step 403, and i is set according to the number m, the serial number sequentially gating tube emitted infrared receiving tube for receiving j to transmit, for one complete small cycles launch tube i is received, and step 404 determines whether or not by determining whether the light is blocked there. If infrared rays are blocked, the value i, j is recorded. If no infrared rays are blocked, the control returns to step 402 to select a launch tube with continued i, and begins the next round of the scan detection. Thus a complete cycle of detection. When determined that the light is blocked, step 405 is executed records, record number and number of receiving tubes is blocked emission tube, i.e., a value of j.

Here the program execution, the operation speed can be based on factors microcontroller, touch screens and the like scan cycle, the steps of setting, there are two ways to choose.

The first way is to focus, i.e. between the two scans, according to each i recorded in the memory, the value of j, the linear equation constructed as previously described manner, the coordinate values ​​solved. In FIG. 4, the path of this approach is performed after step 405, proceeds to decision step 408, it is determined whether the value of j is a set of at least one point two directions? If not, step 402 continues scanning detector return; if received, then in step 409, further determines whether or not the one scan. If the result of the determination is Pat completed a scan, the process proceeds to step 410 calculates, using the method previously described, the coordinate values ​​obtained solving real touch point, then returns to step 402 to begin scanning the next frame. Coordinate value of the touch point is calculated, it is within the set time, the data transfer step 411, the coordinate value through the output port, to transmit using a computer system of the touch screen. This way, the advantage is a less demanding computing power microcontroller, clear focus process, the preparation is relatively simple; real-time response disadvantage is somewhat less; unresponsive prone to the phenomenon during operation quickly.

The second approach is decentralized, i.e. part or all of the data processed during a scan. Step shown in FIG. 2 after the other branch 405. After the completion of recording a set of i, j is the value, for example, obtained in the lateral direction of the touch panel i, j is the value of the established linear equation transmitting and receiving light passing through the tube is blocked by the step 406, as previously described using the intersection of straight lines intersect is Pat known to the condition, a precise location of a touch point in the X direction and the approximate location in the Y direction, then decision step 407 determines whether the other direction (longitudinal direction) has already started to give additional set i, j values. If not in the other direction i, j values, then the other direction are not scanned, step 402 continues to be returned to the scan test; if got another direction, j value, the routine proceeds to step 410 , using the method previously described, the coordinate values ​​obtained solving real touch point, and then returns to step 402 to continue scanning cycle is detected. This way, the advantage of real-time response is very good, especially in response to the rapid operation sensitivity with the use of better results, the drawback is relatively high computing power requirements of the microcontroller, the programming is also complicated.

Although the above describes two different procedures for the flow of the detection and calculation of the touch point, it may be a mixture of two ways, for example, in the second mode, first find the corresponding light is blocked in accordance with i, j straight line, and then wait until the completion of one scan, calculating the detailed coordinates of the touch point. According to the above description of specific embodiments by reference, there are many steps known combinations.

Further, the above-described scanning process can also be implemented by way of fixed launch tube receiving tubes cycled on. Briefly described as follows: a serial number or address for sequentially turned im, im + 1, i-2, il, i, i + l, i + 2 i + ml, i + m number of infrared emission in a real address or launch tube exists, only by the i-IR infrared receiving tube for receiving the strobed sequentially emitted infrared emission, which is detected by the infrared rays are blocked to determine which is the true touch points, which is a pseudo-touch point. In this manner previously described and is used in the center of a plurality of i is receiving tube to receive the serial number or address for the i-infrared emitting tube and a detection principle exactly the same effect, therefore will not be repeated.

Example 2

In alternate approach is shut off and the emission of infrared light emitting tube receiving position in space adjacent to or near the receiving tube and off-axis scanning as illustrated in Figure 5: A composition C was obtained in the step each possible touch point as the center, to make at least one straight line, the straight line through the select, mounted on two pairs of sides of the touch screen, and the light is blocked by the infrared emitter on the tube adjacent to or near the receiving position in space launch tube and the receiver tube. Of course, as described above, in order to ensure sufficient strength of the off-axis light, the angle between the optical axis of the pipe line and this light is blocked as small as possible. Still point D in FIG. 1 as an example, a straight line 110 can be selected through the launch tube receiving tube i-1 and i + 1 to verify that point D is true or false touch point of a touch point. Compared with the first method above, the principle of this method as long as the selection of a suitable pair of transmitting and receiving tube can confirm the authenticity of one scanning. This method requires prior calculate the equation of this straight line, a slightly longer processing time. But the speed of microprocessors now very quickly, and because a linear equation, and therefore should be faster, it is possible to reduce the area of ​​the whole scanning period than the scan speed of the first aspect, to improve the response speed of the touch screen. Of course, the method can also be used to look-up table in the memory, a direct call to be stored when the respective linear equation may be used. In this case the system must have a relatively large memory. 5 corresponds to FIG., The step 501 is replaced in FIG. 301 3. But it should be noted that this line does not intersect with other combinations of coordinate points obtained, or can not determine the point at which light is blocked.

The off-axis main scanning according to the present embodiment may be transformed from Example 1 come, will not be described in detail herein.

Example embodiments above is given where two touch points, but the case of more than two touch points, still can use the same method described in Example detecting process, including some of the connection between the touch point may be in the case of horizontal or vertical parallel infrared (this case is much easier to process), so no further example will be described.

Highlighted foregoing object of the present invention to achieve the basic technical solutions. But as a complete technical solution, the implementation of structural explicitly stated above is not unique. For example, the step of calculating the coordinate values ​​conforming to the computer with the touch screen is connected to the reception format, may be provided prior to eliminate false touch points, after confirmed that a certain point is a dummy touch point, deleting the coordinate values ​​to this point corresponds. In another example, off-axis scanning a first embodiment, it may also be selected receiving a first communication pipe, and then in turn communicates the selected respective launch tube; then, after all of the selected tubes are emitted infrared rays emitted End the second communication is only selected receiver, and then sequentially transmitting the selected communication with the respective pipe eleven order to achieve this, reducing the transient, will ensure more stable signal received by the photo. Therefore improved on the basis of the basic technical solution of the present invention are given in the transplant, modifications, design deletion, additions, etc., fall within the technical scope of the present invention. Industrial Applicability

Through the above description of the Summary of the Invention, we can see the advantages of the present invention, that without changing any of the existing structure of the infrared touch screen conditions, simply by changing the execution of the code in the control microcontroller touch screen working, multi-detection can be achieved the purpose of touch points. Accordingly, the present invention has a very low cost applications, the advantage of very broad applicability; especially for some specific applications, can be realized very easily detect multiple touch points.

Claims

Claims
1. A method for a plurality of touch points on the IR touch screen recognition, the method is applied in the infrared touch screen, infrared touch screen of the infrared emission and reception of the tube array arranged along the touch area around the infrared emitting tube is turned on, and and a control circuit receiving the subsidiary tube and the storage circuit calculates the microcontroller system for transmitting the detected data configuration, comprising the steps of:
A: Start infrared touch screen, in accordance with the selection order of each infrared emitter is turned on and the receiver, to scan the entire touch region;
B: recorded and stored every time infrared rays are blocked infrared transmitting and receiving sequence number or address value of the tube;
C: then determine the single-point touch or multi-touch, if a single touch directly proceeds to step E, if it is multi-touch, to the next step D;
D: selecting the infrared rays are blocked infrared emission tube receiving position in space adjacent to or near, the light-emitting different shaft axis and off-axis scanning receiver tube;
E: transmitting a serial number or address values ​​to the infrared receiving tube is recorded and stored, and the calculated coordinate values ​​are real touch point;
F: The coordinate value of the output point to a real touch of infrared touch screen apparatus which is installed.
2. The method according to claim 1, wherein said step D is performed off-axis scanning infrared transmitting and receiving tubes selection method is: the light is cut off by an infrared transmitting and receiving on the tube as the center choose the number or address of the adjacent infrared transmitting and receiving tube.
3. The method according to claim 2, wherein the step D, the off-axis scanning comprising the steps of:
S1: i-th order is blocked only infrared i-infrared emission only corresponding receiver tube center, a serial number or address for sequentially turned im, im + 1, ......, i-2, i-1, i, i + 1, i + 2 i + ml, i + m in the presence or infrared receiver sequence number received Tubing real address, receiving only the i-infrared emission emitted infrared, serial, or sequentially turned or address im, im + l, i-2, il, i, i + l, i + 2, ......, i + ml, i + m in the presence of infrared emission tube emitting tubes real number or address, receives the gated sequence of infrared emission infrared tube emitted by the i only infrared receiver, wherein m is a natural number set, i is the step B recorded infrared rays are blocked infrared transmitting and receiving sequence number or address values ​​to the tube ; S2: is there a transmission and reception process of step S1 detecting infrared rays are blocked, infrared rays are blocked if not, returns to step S1; if infrared rays are blocked, then proceeds to step S3;
S3: Record and store the serial number or the address value of the transmission tubes and reception tubes of the longitudinal and lateral directions corresponding to the infrared rays are blocked;
S4: then returns to step Sl, until all blocked by receiving infrared scanning infrared emission tube.
4. The method according to claims 1 bifurcation, wherein, prior to procedure D, further comprising the step of: transmitting and receiving a serial number or address value tube according to step B is blocked infrared recording, may be obtained by combining individual touch point.
5. The method as claimed in claim 4, wherein said step D for an off-axis scanning infrared transmitting and receiving tubes selection method as follows: to each of the possible touch point as the center, and do not at least one other possible touch point intersects a straight line, 'select the line traversed, mounted on the tube receiving position in space adjacent to or near the launch tube and the receiver tube on the two panel edges touch, emits the infrared rays cut off .
6. The method of claim 5 pitchfork claims, characterized in that, the step S1 is a natural number m in the range: 10> m> 2.
PCT/CN2008/001095 2007-06-04 2008-06-04 Method for identifying multiple touch points on an infrared touch screen WO2008148307A1 (en)

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