CN101286104B - Method for recognizing multiple touch point at infrared touch screen - Google Patents
Method for recognizing multiple touch point at infrared touch screen Download PDFInfo
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- CN101286104B CN101286104B CN2008100446318A CN200810044631A CN101286104B CN 101286104 B CN101286104 B CN 101286104B CN 2008100446318 A CN2008100446318 A CN 2008100446318A CN 200810044631 A CN200810044631 A CN 200810044631A CN 101286104 B CN101286104 B CN 101286104B
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Abstract
The invention discloses a method for recognizing a plurality of touch points on an infrared touch screen, comprising the steps of: starting the infrared touch screen, driving an infrared emitter and an infrared receiver and forming transverse and longitudinal infrared arrays by corresponding scan; determining the transverse coordinates sets and longitudinal coordinates sets of all touch points, driving the infrared emitter and the infrared receiver, forming an infrared array with the functional relation of that y(x) is equal to f(x) in the touch area by corresponding scan, gaining a set of function value that y(x) is equal to f(x) of the touch points in the touch area, through calculating the sets of two scans by a controller, gaining the coordinates of all touch points and disposing and removing false touch points. The invention can complete the detection of a plurality of touch points without changing the hardware structure of existing touch screen, has no incorrect area of multi-point detection at four corners of the screen body, has higher sensitiveness to adjacent multi-point detection, higher resolution, short scan time and quick response.
Description
Technical field
The present invention relates to a kind of method of infrared touch panel detected touch point, relate in particular to a kind of method of on infrared touch panel, discerning a plurality of touch points.
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.The basic structure of infrared touch panel, be to install some in a certain order to infrared emission and infrared receiver component a display surface edge that is fit to install, infrared transmitting tube and receiving tube angular displacement beta when 0.5 times of relative radiation intensity is generally less than and equals ± 15 degree, it is right that these emissions and infrared receiver component are formed the emission reception according to mode one to one, edge along display surface constitutes a mutually perpendicular emission receiving array, control circuit and driving circuit drive infrared transmitting tube and infrared receiving tube under the control of MCU run time version, the infrared ray matrix that corresponding scanning formation directions X and Y direction are intersected anyhow.When touching, finger or other object will block the infrared ray anyhow through this point, judge the position of touch point at screen by control system.
Existing Infrared touch screen systems, light constitutes lattice structure at display surface, detects when touching, and determines to touch the grid node position that takes place and just can calculate the position coordinates that touch event takes place.This touch detecting pattern makes existing infrared touch panel in the given period, detection system receives only unique one group of position coordinate data, therefore when having only a touch point, touch-screen can operate as normal, when operating simultaneously for two or more touch points, system is with the position coordinates of miscount, and the touch place that causes reporting is not the place of actual touch.For above-mentioned reasons, existing infrared touch panel technology need use the occasion of multiple point touching to lose efficacy at some, and for example many people play simultaneously, many people's while Writing-paintings etc., great like this use field of having limited infrared touch panel.Had at present some solutions for example to discern a plurality of touch points, but relatively moved for not having between a plurality of touch points by the sequencing that the senses touch incident takes place, do not have yet the shape sizes values of touch point can the situation of reference under, judge by accident easily.
Because there is the problem that can not carry out multiple spot identification in existing infrared touch panel, China Patent No. has proposed " a kind of infrared touch panel and multi-point touch locating method thereof " for " 200710028616.X ", adopts corresponding two red chromatographys of the infrared emission scan circuit of a cover to receive sweep circuit outward in this patented technology.China Patent No. has proposed " a kind of method of discerning a plurality of touch points on the infrared touch panel " for " 200710117751.1 ", and this patented technology adopts the corresponding many group of received pipe of one group of power valve.
China Patent No. has proposed " a kind of infrared touch panel and multi-point touch locating method thereof " for " 200710028616.X ", and promptly at least one detection side at touch-screen makes progress, and corresponding two red chromatographys of the infrared emission scan circuit of a cover are accepted sweep circuit outward; The light that the infrared emission unit of one cover in the infrared emission scan circuit sends is accepted infrared receiving element in the sweep circuit outward by a red chromatography and is received when detecting, and also being received to detect by the infrared receiving element in the another set of infrared reception sweep circuit in range of receiving has the touch point pre-detection algoritic module that can be used for determining in advance the touch point scope in the algorithm routine of infrared touch panel.And obtain determining another region, touch point with touch point pre-detection algorithm after the touch point position coordinates with common touch location detection algorithm, again in conjunction with detection algorithm usually to this touch point position coordinates.
Describe and illustrate according to its invention, 1, be to form the Y=X[sin α * sin (alpha+beta) that it is told about in the subregion at 4 angles]/sin β, can not effectively be identified in the multiple point touching in this zone.2, because of it adopts one two method of receiving, disturb producing too much light, it also will additionally prolong the disposal route that adopts the touch-responsive time of touch-screen because of the response time properties of infrared receiving tube.3, because of it adopts one two method of receiving, circuit is implemented in to be realized on the hardware increasing cost of products, needing equally logically to realize hardware supported.4, the anti-light because of CONSIDERING EDGE disturbs, and infrared emission, receiving tube that it will adopt at X-axis and Y-axis different wave length will produce production, handling cost.
China Patent No. has proposed " a kind of method of discerning a plurality of touch points on the infrared touch panel " for " 200710117751.1 ", promptly in not changing the existing structural environment of infrared touch panel, realize by firmware code and the algorithm of carrying out MCU, its method is: to (or on Y-axis) i infrared on the X-axis, reception drives and the receiving tube reception the power valve of pipe, and then to i infrared transmitting tube and i receive only pipe both sides m only (m is more than or equal to 2 but smaller or equal to 5) receiving tube match successively and transmit and receive, back scanning is finished on X-axis and the Y-axis all to pipe again, determines multiple point touching by algorithm with this.
Describe according to its invention, under the same structural environment, when will be single-point sweep time 5 times and more than, exist sweep time oversize, at this moment the touch-responsive time of its touch-screen will significantly prolong, and influences the touch-screen critical technical parameter; In addition, because of the angle of constituting-functions matrix is little, the multiple spot that influence is adjacent detects.
Summary of the invention
The objective of the invention is to overcome the problems referred to above that existing infrared touch panel exists when a plurality of touch point of identification, a kind of method of discerning a plurality of touch points on infrared touch panel is provided, the present invention does not need to change the hardware configuration of existing infrared touch panel, can finish and detect a plurality of touch points, the uncertain region that on four angles of screen body, does not have multiple spot to detect, higher to adjacent multiple spot detection sensitivity, and the resolution height, sweep time is short, and response rapidly.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of method of discerning a plurality of touch points on infrared touch panel is characterized in that comprising the steps: a, starts infrared touch panel, drives infrared transmitting tube and infrared receiving tube, the horizontal and vertical infrared array of corresponding scanning formation; B, corresponding scanning be formed on the touch area have the yn of satisfying (x)=[tan (90-a)] * x+bn and/or: yn (x)=[tan (90+a)] * x+bn funtcional relationship infrared array and yn (x)=(tan a) * x+bn and/or: yn (x)=[tan (180-a)] * x+bn funtcional relationship infrared array obtains the touch point in the y of touch area (x)=f (x) functional value set; C, the set of two kinds of scannings in a step and the b step is calculated, obtain the coordinate figure of all touch points, and handle and reject pseudo-touch point by controller.
Concrete steps of the present invention are as follows: a, startup infrared touch panel, control and driving circuit implementation controller MCU run time version, the infrared linear array example that corresponding scanning formation directions X and Y direction are intersected anyhow; B, detect among the step a and whether have infrared ray to be blocked a little, and if had write down on the X-axis that is blocked a little infrared transmitting tube with receiving tube sequence number or address set and Y-axis on infrared transmitting tube with or receiving tube sequence number or address set; C, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving X-axis of setting is n infrared transmitting tube (n=1,2,3, N) time, on the X-axis of connecting the sequence number of infrared receiver tube or address then for satisfy funtcional relationship: yn (x)=[tan (90-a)] * x+bn and/or: that of yn (x)=[tan (90+a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area; D, detect among the step c and whether have infrared ray to be blocked a little, and if had write down on the X-axis that is blocked some infrared transmitting tube with or receiving tube sequence number or address set; E, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving Y-axis of setting is n infrared transmitting tube (n=1,2,3, M) time, on the Y-axis of connecting the sequence number of infrared receiver tube or address then for satisfy funtcional relationship: yn (x)=(tan a) * x+bn and/or: that of yn (x)=[tan (180-a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area; F, detect among the step e and whether have infrared ray to be blocked a little, and if had write down on the Y-axis that is blocked some infrared transmitting tube with or receiving tube sequence number or address set; G, according to the data that write down among step b, d, the f, calculate the coordinate figure of each touch point, by the touch system interface, each touch point coordinates transmission of drawing in computer system, and is returned step a, begin to carry out new scanning.
The angular displacement when 0.5 times of relative radiation intensity of described horizontal and vertical equally distributed infrared transmitting tube is spent more than or equal to ± 10.
The angular displacement when 0.5 times of relative radiation intensity of described horizontal and vertical equally distributed infrared receiving tube is spent more than or equal to ± 10.
Described controller control Driver Circuit and control circuit drive infrared transmitting tube and infrared receiving tube, and corresponding scanning forms horizontal and vertical infrared ray matrix.
Employing the invention has the advantages that:
One, the present invention compares for the patented technology that " 200710028616.X " name is called " a kind of infrared touch panel and multi-point touch locating method thereof " with China Patent No., do not need to change other hardware configuration form of existing infrared touch panel, hardware cost is in full accord with the single-point infrared touch panel, only by the run time version in the controller that changes the work of control touch-screen, can realize detecting the purpose of a plurality of touch points, and touch performance near existing single-point touches system, have the advantage that application cost is extremely low, cost performance is high.
Two, the present invention compares for the patented technology that " 200710028616.X " name is called " a kind of infrared touch panel and multi-point touch locating method thereof " with China Patent No., the infrared emission of X-axis and Y-axis, receiving tube wavelength, model are identical, to not produce production, handling cost, and be easier to produce.
Three, the present invention compares for the patented technology that " 200710028616.X " name is called " a kind of infrared touch panel and multi-point touch locating method thereof " with China Patent No., does not have the uncertain region of the multiple spot detection at four angles.
Four, the present invention compares for the patented technology that " 200710117751.1 " name is called " a kind of method of discerning a plurality of touch points on the infrared touch panel " with China Patent No., the angle of function of the present invention scanning greater than, equal 10 degree, therefore higher to adjacent multiple spot detection sensitivity.
Five, the present invention compares for the patented technology that " 200710117751.1 " name is called " a kind of method of discerning a plurality of touch points on the infrared touch panel " with China Patent No., the present invention scans the required time to the time of the scanning detection institute expense of touch area in this patented technology, the infrared touch panel touch-responsive time of therefore quoting the present invention's production is fast, the touch-responsive time of approaching existing single-point touches infrared touch system.
Six, the present invention discerns a plurality of touch points simultaneously, the resolution height, and sweep time is short, and response is rapid, and misjudgment phenomenon can not take place, and is applied widely, is easy to realize.
Description of drawings
Fig. 1 is an infrared touch panel structural representation of the present invention
Fig. 2 is a flowage structure synoptic diagram of the present invention
Embodiment
A kind of method of on infrared touch panel, discerning a plurality of touch points, comprise the steps: a, start infrared touch panel, drive infrared transmitting tube and infrared receiving tube, corresponding scanning forms horizontal and vertical infrared array, when touching, write down all touch points infrared transmitting tube on the X-axis and or receiving tube sequence number or address set and Y-axis on infrared transmitting tube and or receiving tube sequence number or address set; B, driving infrared transmitting tube and infrared receiving tube, corresponding scanning be formed on the touch area satisfy yn (x)=[tan (90-a)] * x+bn and/or: yn (x)=[tan (90+a)] * x+bn funtcional relationship infrared array and yn (x)=(tan a) * x+bn and/or: yn (x)=[tan (180-a)] * x+bn funtcional relationship infrared array, when touching record be blocked on a little the X-axis infrared transmitting tube and receiving tube sequence number or address set and Y-axis on infrared transmitting tube with or receiving tube sequence number or address set; C, the set of b and two kinds of scanning results of c is calculated, obtain the coordinate figure of all touch points, and handle and reject pseudo-touch point by controller.
Whether the present invention also comprises detecting in a step has infrared ray to be blocked a little, if having then write down X and Y-axis infrared transmitting tube and/or receiving tube sequence number or the address set that is blocked a little.
Whether the present invention also comprises detect detecting in the b step has infrared ray to be blocked a little, if having then write down on the X-axis that is blocked some infrared transmitting tube and/or receiving tube sequence number or address set on infrared transmitting tube and/or receiving tube sequence number or address set and the Y-axis.
Among the present invention, horizontal and vertical equally distributed infrared transmitting tube angular displacement beta when 0.5 times of relative radiation intensity is spent more than or equal to ± 10.Angular displacement is that the radiation intensity on radiation axis is 1 o'clock, and at the line of 0.5 times of radiation intensity place of equidistant fan-shaped point and the radiant angle to radiation axis, general clockwise direction is for just.Horizontal and vertical equally distributed infrared receiving tube when 0.5 relative radiation intensity angular displacement beta more than or equal to ± 10 degree.Controller control Driver Circuit and control circuit drive infrared transmitting tube and infrared receiving tube, and corresponding scanning forms horizontal and vertical infrared ray matrix.
Launch explanation, the present invention is by being directions X and Y direction arrange uniform infrared transmitting tube and infrared receiving tube by being installed in around along the touch area horizontal and vertical, infrared transmitting tube and infrared receiving tube when 0.5 times of relative radiation intensity angular displacement beta more than or equal to ± 10 degree, at first utilize control circuit and driving circuit under the control of MCU controller run time version, to drive infrared transmitting tube and infrared receiving tube, the infrared ray matrix that corresponding scanning formation directions X and Y direction are intersected anyhow, when touching, at first determine all touch points infrared transmitting tube on the X-axis and or receiving tube sequence number or address set and Y-axis on infrared transmitting tube and or receiving tube sequence number or address set, and then utilize control circuit and driving circuit under the control of MCU run time version, to drive infrared transmitting tube and infrared receiving tube, corresponding scanning formation directions X satisfies yn (x)=[tan (90-a)] * x+bn and/or yn (x)=[tan (90+a)] * x+bn funtcional relationship infrared array and Y direction yn (x)=(tan is * x+bn and/or yn (x)=[tan (180-a)] * x+bn funtcional relationship infrared array a), draw once more all touch points infrared transmitting tube on the X-axis and or receiving tube sequence number or address set and Y-axis on infrared transmitting tube and or receiving tube sequence number or address set, by MCU the sequence number or the address set of two kinds of scannings are calculated and handle, finally obtain the accurate (x in all touch points, y) coordinate figure has all been rejected pseudo-touch point simultaneously.
The funtcional relationship of directions X infrared array: yn (x)=[tan (90-a)] * x+bn, wherein, n represents n the infrared transmitting tube that directions X is arranged, a represents the angle of infrared transmitting tube design, a is more than or equal to+10 degree, but be less than or equal to infrared transmitting tube angular displacement beta when 0.5 times of relative radiation intensity, bn represents n infrared transmitting tube constant term; And/or funtcional relationship: yn (x)=[tan (90+a)] * x+bn, wherein, n represents n the infrared transmitting tube that directions X is arranged, a represents the angle of infrared transmitting tube design, a is more than or equal to+10 degree, but be less than or equal to infrared transmitting tube angle β, bn represents n infrared transmitting tube constant term.
The funtcional relationship of Y direction infrared array: yn (x)=(tan is * x+bn a), wherein, n represents n the infrared transmitting tube that the Y direction is arranged, a represents the angle of infrared transmitting tube design, a is more than or equal to+10 degree, but be less than or equal to infrared transmitting tube angle β), bn represents n infrared transmitting tube constant term; And/or funtcional relationship: yn (x)=[tan (180-a)] * x+bn, wherein, n represents n the infrared transmitting tube that the Y direction is arranged, a represents the angle of infrared transmitting tube design, a is more than or equal to+10 degree, but be less than or equal to infrared transmitting tube angle β, bn represents n infrared transmitting tube constant term.
The present invention specifically comprises the steps:
A, startup infrared touch panel, control and driving circuit are carried out the MCU run time version, the infrared linear array example that corresponding scanning formation directions X and Y direction are intersected anyhow;
B, detect among the step a and whether have infrared ray to be blocked a little, and if had write down on the X-axis that is blocked a little infrared transmitting tube with receiving tube sequence number or address set and Y-axis on infrared transmitting tube with or receiving tube sequence number or address set;
C, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving X-axis of setting is n infrared transmitting tube (n=1,2,3, N) time, the sequence number of infrared receiver tube or address are then for satisfying funtcional relationship on the X-axis of connection:
Yn (x)=[tan (90-a)] * x+bn and/or: that of yn (x)=[tan (90+a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area;
D, detect among the step c and whether have infrared ray to be blocked a little, and if had write down on the X-axis that is blocked some infrared transmitting tube with or receiving tube sequence number or address set;
E, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving Y-axis of setting is n infrared transmitting tube (n=1,2,3, M) time, the sequence number of infrared receiver tube or address are then for satisfying funtcional relationship on the Y-axis of connection:
Yn (x)=(tan a) * x+bn and/or: that of yn (x)=[tan (180-a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area;
F, detect among the step e and whether have infrared ray to be blocked a little, and if had write down on the Y-axis that is blocked some infrared transmitting tube with or receiving tube sequence number or address set;
G, according to the data that write down among step b, d, the f, calculate the coordinate figure of each touch point, by the touch system interface, each touch point coordinates transmission of drawing in computer system, and is returned step a, begin to carry out new scanning.
Obviously; those of ordinary skill in the art is according to technical know-how of being grasped and customary means; according to above said content, can also make the various ways that does not break away from basic fundamental thought of the present invention, these pro forma conversion are all within protection scope of the present invention.
Claims (5)
1. the method for a plurality of touch points of identification on infrared touch panel is characterized in that comprising the steps:
Whether a, start infrared touch panel, drive infrared transmitting tube and infrared receiving tube, corresponding scanning forms horizontal and vertical infrared array, and detect and have infrared ray to be blocked a little, if having then write down sequence number or the address set that is blocked a little; B, corresponding scanning be formed on the touch area have the yn of satisfying (x)=[tan (90-a)] * x+bn and/or: yn (x)=[tan (90+a)] * x+bn funtcional relationship infrared array and yn (x)=(tana) * x+bn and/or: yn (x)=[tan (180-a)] * x+bn funtcional relationship infrared array, obtain the touch point in the y of touch area (x)=f (x) functional value set, and whether detection has infrared ray to be blocked a little, if have then write down sequence number or the address set that is blocked a little, wherein, a represents the angle of infrared transmitting tube design, a is more than or equal to+10 degree, be less than or equal to the infrared transmitting tube angle, bn represents n infrared transmitting tube constant term; C, the set of two kinds of scannings in a step and the b step is calculated, obtain the coordinate figure of all touch points, and handle and reject pseudo-touch point by controller.
2. the method for on infrared touch panel, discerning a plurality of touch points according to claim 1, it is characterized in that: concrete steps are as follows: a, startup infrared touch panel, control and driving circuit implementation controller MCU run time version, the infrared linear array example that corresponding scanning formation directions X and Y direction are intersected anyhow; B, detect among the step a and whether have infrared ray to be blocked a little, if having then write down on the X-axis that is blocked some infrared transmitting tube and/or receiving tube sequence number or address set on infrared transmitting tube and/or receiving tube sequence number or address set and the Y-axis; C, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving X-axis of setting is n infrared transmitting tube (n=1,2,3, N) time, on the X-axis of connecting the sequence number of infrared receiver tube or address then for satisfy funtcional relationship: yn (x)=[tan (90-a)] * x+bn and/or: that of yn (x)=[tan (90+a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area; D, detect among the step c and whether have infrared ray to be blocked a little, if having then write down infrared transmitting tube and/or receiving tube sequence number or address set on the X-axis that is blocked a little; E, control and driving circuit are carried out the MCU run time version, according to sequence number or address on the requirement driving Y-axis of setting is n infrared transmitting tube (n=1,2,3, M) time, on the Y-axis of connecting the sequence number of infrared receiver tube or address then for satisfy funtcional relationship: yn (x)=(tana) * x+bn and/or: that of yn (x)=[tan (180-a)] * x+bn is formed with the detection network of yn (x)=fn (x) function feature in Petting Area; F, detect among the step e and whether have infrared ray to be blocked a little, if having then write down infrared transmitting tube and/or receiving tube sequence number or address set on the Y-axis that is blocked a little; G, according to the data that write down among step b, d, the f, calculate the coordinate figure of each touch point, by the touch system interface, each touch point coordinates transmission of drawing in computer system, and is returned step a, begin to carry out new scanning.
3. the method for discerning a plurality of touch points on infrared touch panel according to claim 1 and 2 is characterized in that: the angular displacement when 0.5 times of relative radiation intensity of described horizontal and vertical equally distributed infrared transmitting tube is spent more than or equal to ± 10.
4. the method for discerning a plurality of touch points on infrared touch panel according to claim 1 and 2 is characterized in that: the angular displacement when 0.5 times of relative radiation intensity of described horizontal and vertical equally distributed infrared receiving tube is spent more than or equal to ± 10.
5. the method for discerning a plurality of touch points on infrared touch panel according to claim 2 is characterized in that: described control and driving circuit drive infrared transmitting tube and infrared receiving tube, and corresponding scanning forms horizontal and vertical infrared ray matrix.
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| CN2008100446318A CN101286104B (en) | 2008-06-05 | 2008-06-05 | Method for recognizing multiple touch point at infrared touch screen |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5157025B2 (en) * | 2009-01-20 | 2013-03-06 | 日東電工株式会社 | Optical coordinate input device |
| CN101907951B (en) * | 2009-06-05 | 2013-04-10 | 鸿富锦精密工业（深圳）有限公司 | Touch control system |
| CN102141864B (en) * | 2010-02-03 | 2013-03-27 | 万达光电科技股份有限公司 | Acoustic wave type multi-touch detection method |
| CN102214046A (en) * | 2010-04-09 | 2011-10-12 | 北京汇冠新技术股份有限公司 | Touch positioning method and system |
| CN102479000A (en) * | 2010-11-26 | 2012-05-30 | 北京汇冠新技术股份有限公司 | Infrared touch screen and multi-point identification method thereof |
| CN102231092B (en) * | 2011-05-18 | 2013-06-12 | 广东威创视讯科技股份有限公司 | Multi-touch tracking and identifying method and system |
| CN102364417B (en) * | 2011-06-28 | 2013-07-10 | 广东威创视讯科技股份有限公司 | Infrared touch screen multi-point recognition method and device |
| CN103970322B (en) * | 2013-01-30 | 2017-09-01 | 北京科加触控技术有限公司 | A kind of method and system of touch-screen track following processing |
| CN103970360B (en) * | 2013-01-30 | 2017-02-08 | 北京汇冠新技术股份有限公司 | Multipoint-touch-based gesture identification method and system |
| US8577644B1 (en) * | 2013-03-11 | 2013-11-05 | Cypress Semiconductor Corp. | Hard press rejection |
| CN103761012B (en) * | 2013-08-27 | 2016-07-13 | 合肥工业大学 | A kind of fast algorithm suitable in large scale infrared touch panel |
| CN104898900B (en) * | 2015-06-25 | 2018-05-01 | 广州华欣电子科技有限公司 | A kind of method and infrared touch frame of the scanning of infrared touch frame |
| CN108037854A (en) * | 2017-12-19 | 2018-05-15 | 迈巨（深圳）科技有限公司 | A kind of precision of infrared touch screen calibration method, electronic equipment and storage medium |
| CN108153451B (en) * | 2018-01-22 | 2020-11-03 | 河北华发教育科技股份有限公司 | Calibration method and system based on touch screen |
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| CN101071356A (en) * | 2007-06-15 | 2007-11-14 | 广东威创日新电子有限公司 | Infrared touch screen and its multi-point touch positioning method |
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