CN101075168A - Method for discriminating multiple points on infrared touch screen - Google Patents
Method for discriminating multiple points on infrared touch screen Download PDFInfo
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- CN101075168A CN101075168A CNA2007101177511A CN200710117751A CN101075168A CN 101075168 A CN101075168 A CN 101075168A CN A2007101177511 A CNA2007101177511 A CN A2007101177511A CN 200710117751 A CN200710117751 A CN 200710117751A CN 101075168 A CN101075168 A CN 101075168A
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- 238000005516 engineering process Methods 0.000 description 9
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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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/048—Indexing scheme relating to G06F3/048
- G06F2203/04808—Several 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
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Abstract
A method for identifying multiple touch-point on infrared touch screen includes using light cut off by touch object between emitting and receiving tubes of co-axis and off-axis to confirm approximate coordinate value of touch point at one direction and preliminarily rejecting out pseudo-touch point and then using the same means to do the same thing on another direction for finally obtaining accurate coordinate value of all touch points and simultaneously rejecting out all pseudo-touch points.
Description
Technical field
The present invention relates to a kind of method that is used for the infrared touch panel detected touch point, belong to microprocessor control technology field, in particular for the detection technique field, touch point of computing machine touch-screen.
Background technology
As a branch of computing machine touch-screen, infrared touch panel is with advantages such as its anti-knock properties easy for installation, non-maintaining, high, high reliability and be widely used in every field gradually.Though passed through 20 years of development, numerous technological improvements is arranged, be the content that 95105303.5,00121462.4 etc. Chinese patent or application are announced as number.But at present the basic technical scheme of infrared touch panel still is confined to United States Patent (USP) 3,764, the disclosed technology contents of patent such as 813,3,775,560,3,860,754.But these technology contents all are far from having given play to the technical merit that infrared touch panel can reach, and all touches detect all can only detect single touch point.Progress along with computer hardware technique, computing machine has had function from strength to strength, also more and more being applied to almost, we can imagine any field that obtains, so at different applications, sometimes the multiple point touching technology more can make things convenient for user's operational computations machine, perhaps at specific software, the multiple point touching technology is more efficient.But this just requires touch-screen to support multiple point touching, can detect to surpass one touch point.Present infrared touch panel can't be realized the detection at a plurality of touch points, in the touch-screen of other types, also having only application number is that 02822048.X, 200580011740.4 Chinese patent and application number are several technical schemes such as U.S. Patent application of US20050257924.But these technical schemes all can not be applied to infrared touch panel.
Summary of the invention
Purpose of the present invention is exactly the weak point at existing infrared touch panel, discloses a kind of method that multiple point touching detects that realizes on infrared touch panel.Method of the present invention, be applied in by the infrared emission of arranging around the touch area and receive the pipe array, connect the accessory circuit of described infrared transmitting tube and receiving tube and control described circuit and storage, calculate, among the infrared touch panel that micro controller system constituted of the detected data of transmission, include following steps:
A. start infrared touch panel, drive i infrared transmitting tube (i=1 according to the order of setting, 2, N), launch ultrared the time driving i power valve, connect sequence number or address and be i-m, i-m+1 ..., i-2, i-1, i, i+1, i+2 ..., the receiving tube of sequence number or address necessary being in i+m-1, the i+m infrared receiving tube, receive described i the infrared ray that infrared transmitting tube is launched, here N is the sum of power valve, the natural number of m for setting generally got 5 〉=m 〉=2;
Whether B. detect transmitting and receiving of steps A has infrared ray to be blocked in the process; If there is not infrared ray to be blocked, then return steps A, after i=N, begin region-wide next time scanning again; If there is infrared ray to be blocked, then continue step C;
C. note down the sequence number that the vertical and horizontal infrared ray is blocked power valve and receiving tube, and obtain some by straight line that described power valve and receiving tube determined according to these sequence numbers;
D. some straight lines that utilize step C to obtain calculate the coordinate of each touch point, and the interface by touch-screen, are transferred to the computer system that described infrared touch panel is installed;
E. return steps A, begin new scanning.
Further, in said method, also include some implementation steps more specifically, as follows:
Whether the straight line described in the step C obtains light in detection and obtains after being blocked at once, and then detect the light that next group transmits and receives between the pipe and be blocked.Perhaps, straight line described in the step C, be when scan vertically or horizontal in a direction, obtain and noted down the sequence number of infrared emission reception that this direction glazed thread is cut off to pipe after, begin to scan the another one direction again and obtained infrared emission that this direction glazed thread is cut off to be established and to obtain after receiving sequence number to pipe, and then continuing to drive remaining infrared emission and receiving tube, scanning detects remainder.
In these cases, the described coordinates computed value of step D is calculated, be when scan vertically or horizontal in a direction, obtain and noted down the sequence number of infrared emission reception that this direction glazed thread is cut off to pipe after, begin to scan the another one direction again and obtained infrared emission that this direction glazed thread is cut off to receive then to the sequence number of pipe, each the bar straight line that obtains according to step C this calculation procedure that will begin in a minute, continue to drive remaining infrared emission and receiving tube after to be calculated the finishing again, scanning detects remainder.
Implementation step C also has a kind of scheme, and promptly the straight line described in the step C is after the scanning of finishing whole screen, just is blocked according to the infrared ray of record that the sequence number of power valve and receiving tube obtains.
Under above-mentioned all situations, the described coordinates computed value of step D is calculated, and is after the scanning of finishing whole screen, and each the bar straight line that obtains according to step C begins this calculation procedure again.
By on regard to the description of summary of the invention, can see advantage of the present invention, be under the condition that does not change existing infrared touch panel any structure,, just can realize detecting the purpose of a plurality of touch points only by the run time version in the microcontroller that changes the work of control touch-screen.Therefore, the present invention has the advantage that application cost is extremely low, applicability is boundless.Especially for some special application, can realize detection easily to a plurality of touch points.
Description of drawings
Fig. 1: the General Principle synoptic diagram that a plurality of touch points are detected;
Fig. 2: the main program flow chart that a plurality of touch points are detected.
Specific embodiments
Fig. 1 gives the basic mounting structure of the infrared touch panel that appears at general structure in fact, also is the basic mounting structure of the infrared touch panel that method of the present invention was suitable for.As shown in the figure, described touch-screen touches surveyed area (generally being the viewing area as graphoscope, projector screen) 101 infrared transmitting tube array 102 on every side, the rectangular touch screen that infrared receiving tube array 103 constitutes by being installed in.Infrared emission wherein and receiving tube both can be the same with the infrared touch panel of existing structure, and quantity is identical, and be corresponding one by one and constitute infrared emission and receive pipe; Also can power valve and the quantity of receiving tube be set to different.But from the uniform purpose of resolution, quantity such as employing best to tubular construction.Serve as the implementation content that the basis illustrates the inventive method with described " to pipe " structure exactly below.
The core of scan method used herein is " from axle " scanning.When using this method scanning senses touch screen horizontal and vertical, touch objects infrared ray between not only at least two pairs of blocking-up transmit and receive pipe on both direction in length and breadth is blocked but also have non-infrared ray to " from axle " between the pipe.Do from axle scanning, exactly by a pair of infrared emission reception the power valve in the pipe is launched infrared ray, and by other a pair of emission reception the receiving tube in the pipe is received.Because the optical axis of these two pairs of pipes is not a same optical axis, so be called from axle in the present invention.
For implementation method of the present invention more clearly is described, at first the hypothesis maximum sequence number that transmits and receives pipe is that (use the scanning sequency that emission or receiving tube are described according to ascending arrangement sequence number at this, emission and receiving tube address also can be converted into sequence number to N; And from the structure of infrared touch panel as can be known, other queueing discipline also can be converted into ascending sequence number).Use the course of work of infrared touch panel of the inventive method as follows: the microprocessor controls infrared transmitting tube by according to the order of sequence number by gating emission infrared ray one by one.After sequence number of every gating is the power valve of i, infrared receiving tube at this power valve opposite side, being the center with the described receiving tube that is matched mutually by the gating power valve, microcontroller several the sequence numbers that continuous gating is adjacent with described receiving tube successively are in esse coaxial and from the axle receiving tube, receive described tube-launched infrared ray.Suppose except with receiving tube that described power valve matches mutually, the described quilt quantity of the receiving tube of gating successively is 2m, then is respectively by the sequence number j of the receiving tube of microcontroller gating successively: j=i-m, i-m+1 ..., i-2, i-1, i, i+1, i+2 ..., i+m-1, i+m.Here the natural number of m for setting, can come value according to the length of response time of the size of touch-screen and requirement: m value is big, the precision height, the scan period is long, response speed is slower, on the contrary m is little, then the scan period short, respond soon.Therefore generally get m=2～5, i.e. 5 〉=m 〉=2.When the Receiving Officer with power valve i pairing is positioned at the edge of touch area, some sequence number is non-existent in may above-mentioned sequence number: such as when the i=1, be the emission at edge or receiving tube, i-m, i-m+1 ..., these receiving tubes of i-2, i-1 are actually non-existent; And when i=N, i+1, i+2 ..., i+m-1, i+m then do not exist.In the middle of scanning process, the termination pipe of a direction and the initial pipe of another direction also are above-mentioned situations.In whole scanning testing process, all infrared emission and receiving tube all come when i=N, to be finished the frame scan to the touch area by gating according to above-mentioned rule.
Example below in conjunction with Fig. 1 describes scanning detection principle of the present invention in detail.(among the Fig. 1 solid line circle) 105 and 106 that suppose that two touch objects are arranged in the scan test section territory of touch-screen represents with character B, D respectively.That existing infrared touch panel is adopted when adopting, when only detecting the method whether infrared ray between the pipe is blocked and scan the senses touch thing, then at least two pairs to the pipe (look the size of touch objects size, if bigger may have more to the pipe, be assumed to be two pairs for principle of specification at this) between Infrared 104 will be blocked, shown in dotted line among the figure 109.Suppose that laterally, the sequence number of two pairs of pipes that light is blocked is a and b; Vertically, the sequence number that light is blocked two pairs of pipes is c and d.So just be equivalent in that the sequence number of pipe or emission are received the scan address of pipe in microcontroller is that the intrinsic coordinates of coordinate linear module is among the XOY to transmit and receive, will be at the coordinate figure that a and two touch objects of b laterally occur, at the coordinate figure that c and two touch objects of d vertically will occur.With this four coordinate figures combination, just can obtain A (a, c), B (a, d), C (b, c) and D (b, d) four touch objects possible positions promptly include A and two pseudo-touch points 107,108 of C in four possible touch points.But the microcontroller of touch-screen inside can not judge which is pseudo-touch point, and which is in esse touch point.
And when adopting method of the present invention, be example with the touch point D among Fig. 1, except sequence number be the emission of i=b receive the light between the pipe is blocked, also having sequence number is that infrared ray between i-1 → i+1, the i+1 → i-1 is blocked.And for pseudo-touch point C, the light between i → i-1, the i → i+1 is not blocked.Like this, just can obtain the D point on directions X the actual coordinate value and at the roughly coordinate figure of Y direction, also just tentatively simultaneously judge that touch point C is pseudo-touch point.Detect that vertically to go up with sequence number a be that light between the transmit-receive tube of center is blocked situation again, can obtain the coordinate figure of D on the Y direction, judging the A point simultaneously is pseudo-touch point.For touch point B, make to use the same method, can obtain its coordinate figure on X and Y direction, and judge A fully and C is pseudo-touch point.
In fact, the geometry basis of this detection method is finding the solution for the intersection point of straight-line equation.Because on whole touch screen, all positions that transmit and receive pipe all are known and fixing in coordinate system XOY, so the equation of the straight line (infrared ray) between any power valve and any receiving tube all is known, the coordinate figure of the whole intersection points between these straight lines is known all just so, and according to geometry principle as can be known, have between the uneven straight line on the plane and an intersection point arranged.If certain two or many straight lines are cut off (infrared ray is blocked) together in these straight lines, the blocking-up point necessarily is exactly the intersection point of these two or many straight lines so.If touch-screen has only the scanning of a direction (for example shown in the figure laterally) to detect, so above-mentioned method just can detect the touch point in the exact position of directions X with in the approximate location of Y direction; But touch-screen also has the scanning of another one direction (being vertically shown in the figure) to detect, and can obtain the approximate location of touch point in the Y direction as mentioned above.Like this, infrared touch panel just can accurately obtain each touch point position, and is not only limited to a touch point.
Fig. 2 has provided the program flow diagram of whole detection, corresponding top key step.Step 201 is the setting up procedures that detect, and enters trace routine, enters the step 202 of scanning then, and selected in order sequence number is the infrared transmitting tube of i.Enter step 203 then, according to the m of sequence number i and setting, coming gating sequence number successively is that the receiving tube of j receives the infrared ray that power valve sends, and one that finishes at power valve i receives partial circulating, and judged whether that by determining step 204 light is blocked.If there is infrared ray to be blocked, then write down the numerical value of i, j.If there is not infrared ray to be blocked, then return controlled step 202, continue to select next power valve i, the scanning that restarts next round detects.So frame detection is finished in circulation.If judging has light to be blocked, then executive logging step 205 writes down the sequence number and the sequence number of receiving tube, the i.e. value of i, j that are hindered the power valve of working as.
Program is carried out here, just can set following step according to the arithmetic speed of microcontroller, the factors such as scan period of touch-screen, has dual mode available.
First kind is the mode that focuses on, and just between two frame scans, according to each j that writes down in the storer, the numerical value of j, makes up straight-line equation according to foregoing mode, finds the solution coordinate figure.In Fig. 2, the execution route of this mode is after step 205, enters determining step 208, judged whether to obtain one group of i, the j value of at least one point of both direction? continue the scanning detection if no, then return step 202; If obtained, then, further judge whether to have finished a frame scan by step 209.If the result who judges has finished a frame scan, then enter calculation procedure 210, utilize foregoing method, find the solution the coordinate figure that obtains real touch point, return step 202 then, the scanning of beginning next frame detects.The coordinate figure of the touch point that calculates then in the time of setting, by data transmission step 211, by output port, is transferred to the computer system of using this touch-screen with coordinate figure.Make in this way, advantage is less demanding to the arithmetic capability of microcontroller, and processing procedure is clear to be concentrated, and writes also fairly simple; Shortcoming is that the real-time response ability is poor slightly; Unresponsive phenomenon appears when operating fast easily.
Second kind is the processing mode of disperseing, and promptly handles some or all of data in scanning process.Another branch after the step 205 as shown in Figure 2.After the numerical value that has write down one group of i, j, for example described i, j value have been obtained in a lateral direction at touch-screen, hindered the straight-line equation that transmits and receives pipe of working as by step 206 foundation by light, the intersection point that utilizes straight line to intersect as previously mentioned is this known condition, obtain the touch point in the exact position of directions X with in the approximate location of Y direction, by determining step 207, judge whether on other direction (vertically), to have obtained other one group of i, j value then.If do not obtain described i, j value on other direction, it is scanned to illustrate that then the another one direction does not also have, and should turn back to step 202 and continue the scanning detection; If obtained i, the j value of other direction, then directly enter step 210, utilize foregoing method, find the solution the coordinate figure that obtains real touch point, turn back to step 202 then and continue the circulation that scanning detects.Make in this way, advantage is that the real-time response ability is fine, especially is quick on the draw to quick operating, has better result of use, and shortcoming is that the arithmetic capability of microcontroller is had relatively high expectations, and writing of program is also complicated.
Though provided two kinds of different program circuits above at the detection and the calculating of touch point, but also can mix use in two ways, for example, in the second way, the straight line that elder generation finds corresponding light to be blocked according to i, j, wait until then and finish after the frame scan coordinate in the detailed calculated touch point.By the explanation of accompanying drawing to specific embodiments, the array mode of step has a variety of as can be known according to top.
Because the principle of work of infrared touch panel has been a public technology, technology contents such as above-mentioned detection, judgement, calculating all are the contents of program design and mathematical computations, so need not to describe in detail at this again.
Top embodiment is given is the situation that has two touch points on the touch-screen shown in Figure 1.But situation more than two touch points, still can use the same method among the embodiment to detect processing, comprise the situation (this situation deals with simpler) that the line between some touch point may parallel with infrared ray laterally or longitudinally, therefore need not again bright for instance.
Realization the object of the invention basic technical scheme has been stressed in the front.But as complete application technology scheme, the above-mentioned enforcement structure that offers some clarification on is not unique.Combination such as different step in the above-mentioned dual mode; For another example, the selection mode that transmits and receives pipe can also be exchanged---after sequence number of gating is the receiving tube of i, near some power valves the gating sequence number i again, realizing that scanning detects---this order realizes, reduced transient process, will guarantee that the photosignal that receives is more stable.Therefore improvement, transplanting, the accommodation of the carrying out on the basis of the given basic technical scheme of the present invention, the design of mode such as delete, augment, all belong within the technical scope of the present invention.
Claims (7)
1. method of discerning a plurality of touch points on the infrared touch panel, this method is applied in by the infrared emission of arranging around the touch area and receives the pipe array, connects the accessory circuit of described infrared transmitting tube and receiving tube and control described circuit and storage, calculate, among the infrared touch panel that micro controller system constituted of the detected data of transmission, include following steps:
A. start infrared touch panel, drive i infrared transmitting tube (i=1 according to the order of setting, 2, N), launch ultrared the time driving i power valve, connect sequence number or address and be i-m, i-m+1 ..., i-2, i-1, i, i+1, i+2 ..., the receiving tube of sequence number or address necessary being in i+m-1, the i+m infrared receiving tube, receive described i the infrared ray that infrared transmitting tube is launched, here the natural number of m for setting;
Whether B. detect transmitting and receiving of steps A has infrared ray to be blocked in the process; If there is not infrared ray to be blocked, then return steps A, after i=N, begin region-wide next time scanning again; If there is infrared ray to be blocked, then continue step C;
C. note down the sequence number that the vertical and horizontal infrared ray is blocked power valve and receiving tube, and obtain some by straight line that described power valve and receiving tube determined according to these sequence numbers;
D. some straight lines that utilize step C to obtain calculate the coordinate of each touch point, and the interface by touch-screen, are transferred to the computer system that described infrared touch panel is installed;
E. return steps A, begin new scanning.
2. whether method according to claim 1 is characterized in that: the straight line described in the step C is to obtain light in detection to be established at once and to obtain after being blocked, and then detect the light that next group transmits and receives between the pipe and be blocked.
3. method according to claim 1, it is characterized in that: the straight line described in the step C, be when scan vertically or horizontal in a direction, obtain and noted down the sequence number of infrared emission reception that this direction glazed thread is cut off to pipe after, begin to scan the another one direction again and obtained infrared emission that this direction glazed thread is cut off to be established and to obtain after receiving sequence number to pipe, and then continuing to drive remaining infrared emission and receiving tube, scanning detects remainder.
4. method according to claim 1 is characterized in that: the straight line described in the step C is after the scanning of finishing whole screen, just is blocked according to the infrared ray of record that the sequence number of power valve and receiving tube obtains.
5. according to claim 1,2 or 3 described methods, it is characterized in that: the described coordinates computed value of step D is calculated, be to scan vertically or a direction laterally, obtaining and noted down infrared emission that this direction glazed thread is cut off receives after the sequence number to pipe, begin to scan the another one direction again and obtained infrared emission that this direction glazed thread is cut off to receive then to the sequence number of pipe, each the bar straight line that obtains according to step C this calculation procedure that will begin in a minute, continue to drive remaining infrared emission and receiving tube after calculating is finished again, scanning detects remainder.
6. according to claim 1,2,3 or 4 described methods, it is characterized in that: the described coordinates computed value of step D is calculated, and is after the scanning of finishing whole screen, and each the bar straight line that obtains according to step C begins this calculation procedure again.
7. method according to claim 1 is characterized in that: the span of the natural number m described in the steps A is: 5 〉=m 〉=2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710117751.1A CN101075168B (en) | 2007-06-22 | 2007-06-22 | Method for discriminating multiple points on infrared touch screen |
| PCT/CN2008/001095 WO2008148307A1 (en) | 2007-06-04 | 2008-06-04 | Method for identifying multiple touch points on an infrared touch screen |
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| CN200710117751.1A CN101075168B (en) | 2007-06-22 | 2007-06-22 | Method for discriminating multiple points on infrared touch screen |
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| CN101075168B CN101075168B (en) | 2014-04-02 |
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Cited By (55)
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| WO2008148307A1 (en) * | 2007-06-04 | 2008-12-11 | Beijing Irtouch Systems Co., Ltd. | Method for identifying multiple touch points on an infrared touch screen |
| WO2010006886A2 (en) * | 2008-06-23 | 2010-01-21 | Flatfrog Laboratories Ab | Determining the location of one or more objects on a touch surface |
| WO2010015408A1 (en) * | 2008-08-07 | 2010-02-11 | Owen Drumm | Method and apparatus for detecting a multitouch event in an optical touch-sensitive device |
| WO2010043165A1 (en) * | 2008-10-14 | 2010-04-22 | Ho Wai | Multi-point recognition method of infrared touch screen |
| CN101286104B (en) * | 2008-06-05 | 2010-06-09 | 成都吉锐触摸技术股份有限公司 | Method for recognizing multiple touch point at infrared touch screen |
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| CN101984393A (en) * | 2010-11-26 | 2011-03-09 | 中航华东光电有限公司 | Method for improving precision of infrared touch screen |
| WO2011116538A1 (en) * | 2010-03-26 | 2011-09-29 | Chen Weishan | Identification method for identifying multiple touch points on touch screen simultaneously |
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| CN102364415A (en) * | 2011-06-28 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Infrared touch screen multi-touch-point recognition method and device |
| CN102419663A (en) * | 2011-08-03 | 2012-04-18 | 北京汇冠新技术股份有限公司 | Infrared touch screen multi-point identification method and system |
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Application publication date: 20071121 Assignee: GUANGZHOU HUAXIN ELECTRONICS Co.,Ltd. Assignor: BEIJING IRTOUCH SYSTEMS Co.,Ltd. Contract record no.: 2014990000925 Denomination of invention: Method for discriminating multiple points on infrared touch screen Granted publication date: 20140402 License type: Common License Record date: 20141212 |
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Application publication date: 20071121 Assignee: GUANGZHOU HUAXIN ELECTRONICS Co.,Ltd. Assignor: Three wisdom education Polytron Technologies Inc. Contract record no.: X2020440000071 Denomination of invention: Method for discriminating multiple points on infrared touch screen Granted publication date: 20140402 License type: Common License Record date: 20200421 |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220805 Address after: Room 101-602, 6th floor, building 21, East District, yard 10, northwest Wangdong Road, Haidian District, Beijing 100085 Patentee after: BEIJING IRTOUCH SYSTEMS Co.,Ltd. Address before: 100193 6, 101-601, 21 building, 10 East North Road, Haidian District, Beijing. Patentee before: Three wisdom education Polytron Technologies Inc. |