CN102207800A - Method and device for identifying touch points of infrared touch screen - Google Patents
Method and device for identifying touch points of infrared touch screen Download PDFInfo
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- CN102207800A CN102207800A CN2011102067182A CN201110206718A CN102207800A CN 102207800 A CN102207800 A CN 102207800A CN 2011102067182 A CN2011102067182 A CN 2011102067182A CN 201110206718 A CN201110206718 A CN 201110206718A CN 102207800 A CN102207800 A CN 102207800A
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Abstract
The invention discloses a method for identifying touch points of an infrared touch screen. The method comprises the following steps of: carrying out first scanning when an infrared transmitting tube and an infrared receiving tube which are gated are on a same optical axis line, and acquiring first analogue signal data; scanning the touch screen in each scanning period, and acquiring second analogue signal data; scanning when the infrared transmitting tube and the infrared receiving tube which are gated are not on the same optical axis line, and acquiring the digital signal data of the infrared receiving tube; if a different value between the first analogue signal data and the second analogue signal data is more than or equal to a preset numerical value, determining a theoretical touch point according to the first analogue signal data and the second analogue signal data; judging whether a light ray of the infrared transmitting tube is shaded, and if the light ray of the infrared transmitting tube is shaded, determining a true touch point according to point intersection of the shaded light ray; and acquiring a coordinate of the true touch point. The invention also discloses a device for identifying the touch points of the infrared touch screen. By the invention, the identification accuracy of the touch points can be improved, and an identification speed is increased.
Description
Technical field
The present invention relates to the touch-screen field, be specifically related to touch point recognition methods of a kind of infrared touch panel and device.
Background technology
Infrared touch panel is to utilize X, and the infrared ray matrix that gathers on the Y direction detects the also touch of consumer positioning.Infrared touch panel is installed a circuit board housing in the front of display, arrange on screen four limits infrared emission tube and infrared receiving tube, the crisscross infrared matrix of corresponding one by one formation.The user is when touch screen, and finger will block two infrared rays anyhow through this position, thereby can judge the position of touch point at screen.Infrared touch panel is highly integrated electronic circuit integrated product.Infrared touch panel comprises a complete integration control circuit, one group of high precision, anti-interference infrared transmitting tube and one group of infrared receiving tube, and intersection is installed in two relative directions on the highly integrated circuit board, forms a sightless infrared ray grating.Being embedded in intelligence control system in the control circuit sends the pulse shaping infrared ray to diode constantly and shakes the light beam grid partially.Just blocked light beam when touching object (as: when finger etc. enters grating).The loss that intelligence control system just can spy out light changes, and transmission signals is to control system, to confirm X-axis and Y-axis coordinate figure.
At present, the technology that mainly adopts of the identification of infrared tube touch screen touch point has: 1, touch frame with the infrared tube of simulating signal identification and can be used for high-precision touch recognition; 2, use digital signal to discern;
But be limited by the speed bottle-neck of simulating signal system, can't realize a plurality of oblique coordinates system co-operation in allowing time span, the multiple touch points recognition capability is relatively poor;
Perhaps, be limited by the low resolution of this digital signal, it touches degree of accuracy can't satisfy the demand (as write, draw) in certain applications field.
Summary of the invention
The invention discloses touch point recognition methods of a kind of infrared touch panel and device, can improve the touch point accuracy of identification, improve recognition speed.
The touch point recognition methods of a kind of infrared touch panel comprises step:
The infrared transmitting tube of gating and infrared receiving tube are when same optical axis, do not having to carry out the full screen scanning first time under the situation of touch point, obtain first analog signal data of infrared receiving tube, each scan period is carried out full screen scanning to touch-screen later on, obtains second analog signal data of infrared receiving tube;
The infrared transmitting tube of gating and infrared receiving tube carry out periodic full screen scanning not when same optical axis, obtain the digital signal data of infrared receiving tube;
If the difference of described first analog signal data and described second analog signal data is then determined theoretical touch point according to described first analog signal data and described second analog signal data more than or equal to default value;
Whether the light of judging infrared transmitting tube according to described digital signal data is blocked, if then the intersection point situation according to the described light that is blocked filters out true touch point from described theoretical touch point;
Obtain the coordinate of described true touch point.
The invention also discloses a kind of infrared touch panel touch point recognition device, comprising:
Scanning element is used for touch-screen is carried out full screen scanning;
First acquiring unit, be used for when the infrared transmitting tube of gating and infrared receiving tube during at same optical axis, and when not having the touch point, obtain first analog signal data of infrared receiving tube, and after the next scan period begins, obtain second analog signal data of infrared receiving tube;
Second acquisition unit is used for obtaining the digital signal data of infrared receiving tube when the infrared transmitting tube of gating and infrared receiving tube during not at same optical axis;
First judging unit when being used for difference in described first analog signal data and described second analog signal data more than or equal to default value, is determined theoretical touch point according to described first analog signal data and described second analog signal data;
Second judging unit is used for judging according to described digital signal data whether the light of infrared transmitting tube is blocked, if then the intersection point situation according to the described light that is blocked filters out true touch point from described theoretical touch point;
Positioning unit is used to obtain the coordinate of described true touch point.
The present invention is by obtaining infrared transmitting tube and the infrared receiving tube receiving tube analog signal data when the same optical axis, the analog signal data of obtaining after analog signal data when comparing original state and the touch, if their difference is more than or equal to default numerical value, then judge to have the touch point, and tentatively determine theoretical touch point; Obtain the not receiving tube digital signal data when same optical axis of infrared transmitting tube and infrared receiving tube, reject pseudo-touch point; Calculate the touch point coordinate time, adopt analog signal data, can improve the accuracy of identification of touch point; Recognition speed when adopting digital signal data to discern a plurality of touch points can to improve the identification of a plurality of touch points.
Description of drawings
Fig. 1 is an embodiment process flow diagram of the inventive method;
Fig. 2 is a structural representation of apparatus of the present invention;
Fig. 3 is another structural representation of apparatus of the present invention;
Fig. 4 is a concrete application examples synoptic diagram of the present invention;
Fig. 5 is another concrete application examples synoptic diagram of the present invention.
Embodiment
For ease of understanding the present invention, set forth below in conjunction with accompanying drawing.
Which type of before setting forth, at first illustrate under the situation to be referred to as " infrared transmitting tube and infrared receiving tube are at same optical axis " and " infrared transmitting tube and infrared receiving tube be not at same optical axis "; With reference to figure 5, on X-direction, there are 16 pairs of infrared emission to receive to pipe, if infrared transmitting tube x1 emission, infrared receiving tube y1 receives, and is referred to as this moment " infrared transmitting tube x1 and infrared receiving tube y1 are on same optical axis ", in such cases, the scanning of touch-screen is referred to as vertical scanning; If infrared transmitting tube x1 emission, the infrared receiving tube except that infrared receiving tube y1 receives, and be referred to as " infrared transmitting tube and infrared receiving tube be not on same optical axis " this moment, in such cases, to the scanning of touch-screen, is referred to as oblique scanning; On Y direction in like manner.
Introduce a kind of infrared touch panel touch point recognition methods disclosed by the invention below,, comprise step with reference to figure 1:
101, obtain first simulating signal of infrared receiving tube;
The infrared transmitting tube of gating and infrared receiving tube not having to carry out the full screen scanning first time under the situation of touch point, obtain first analog signal data of infrared receiving tube when same optical axis.
102, obtain second simulating signal of infrared receiving tube;
Each scan period is carried out full screen scanning to touch-screen later on, obtains second analog signal data of infrared receiving tube.
103, obtain the digital signal data of infrared receiving tube;
The infrared transmitting tube of gating and infrared receiving tube carry out periodic full screen scanning not when same optical axis, obtain the digital signal data of infrared receiving tube.
104, judge whether to exist the touch point;
According to first analog signal data and second analog signal data and default numerical value, judge whether to exist the touch point, if more than or equal to default value, then judging, the difference of first analog signal data and second analog signal data has the touch point, carry out step 105.
105, determine theoretical touch point;
Determine theoretical touch point according to first analog signal data and second analog signal data.
106, judged whether that infrared light is blocked;
Whether the light of judging infrared transmitting tube according to digital signal data is blocked, if then carry out step 107.
107, determine true touch point according to digital signal data;
Intersection point situation according to the light that is blocked filters out true touch point from described theoretical touch point.
108, calculate the actual touch point coordinate.
Obtain the coordinate of true touch point.The coordinate of described touch point can calculate according to first analog signal data and second analog signal data in this step, also can calculate when step 105 is determined theoretical touch point.
The present invention is by obtaining infrared transmitting tube and the infrared receiving tube receiving tube analog signal data when the same optical axis, the analog signal data of obtaining after analog signal data when comparing original state and the touch, if their difference is more than or equal to default numerical value, then judge to have the touch point, and tentatively determine theoretical touch point; Obtain the not receiving tube digital signal data when same optical axis of infrared transmitting tube and infrared receiving tube, reject pseudo-touch point; Calculate the touch point coordinate time, adopt analog signal data, can improve the accuracy of identification of touch point; Recognition speed when the recognition methods of employing digital signal data can improve the identification of a plurality of touch points.
Particularly, as a kind of optimal way, can be to the signal sets threshold value of described infrared receiving tube reception, when the output of described infrared receiving tube surpassed described threshold value, obtaining digital signal data was 1 or 0; When the output of described infrared receiving tube was no more than described threshold value, obtaining digital signal data was 0 or 1.Can judge by described digital signal data whether described infrared receiving tube receives the infrared ray of effective capacity, thereby can judge between corresponding infrared transmitting tube and the infrared receiving tube whether be blocked fast.
Be not all to be multiple point touching when touching on touch-screen, many times be single-point touches at every turn, during single-point touches, and the nonessential digital signal data that obtains infrared receiving tube, to reject pseudo-touch point; During single-point touches, the analog signal data of an infrared receiving tube that need utilization is obtained just can obtain the coordinate of touch point accurately.Can improve the speed of touch point identification like this.Therefore can do further improvement to the foregoing description:
After in step 105, determining theoretical touch point, comprise step: judge whether theoretical touch point surpasses one, if carry out 106 steps; If not, then directly obtain the coordinate of touch point.
Consider that may there be the situation that does not have the touch point in touch-screen after starting, and can do further improvement to the scheme of the foregoing description:
In step 104, if the difference of first analog signal data and second analog signal data is then returned 102 steps less than default value.
Consider simultaneously, when tiltedly scanning, the situation that the light of infrared transmitting tube is not blocked, can do further improvement to the foregoing description:
Judge according to digital signal data in step 106 and if the light of infrared transmitting tube is not blocked, then to return 102 steps in the step whether light of infrared transmitting tube be blocked.
The execution sequence of above-mentioned steps 103 is not must be before step 104, can be after step 104 or step 105, before the step 106 yet.
Among the above embodiment, the touch point Coordinate Calculation is not must be after determining the step of true touch point, can be when determining theoretical touch point, and the coordinate of theory of computation touch point; After the true touch point to be determined, the coordinate that obtains corresponding true touch point gets final product.
Wherein, the analog signal data of mentioning among the present invention can be the magnitude of voltage of infrared receiving tube output, also can be current value.
Then introduce device of the present invention, with reference to figure 2, a kind of infrared touch panel touch point recognition device comprises:
Scanning element T1 is used for touch-screen is carried out full screen scanning;
The first acquiring unit T2, be used for when the infrared transmitting tube of gating and infrared receiving tube during at same optical axis, and when not having the touch point, obtain first analog signal data of infrared receiving tube, and, obtain second analog signal data of infrared receiving tube in the next scan period;
Second acquisition unit T3 is used for obtaining the digital signal data of infrared receiving tube when the infrared transmitting tube of gating and infrared receiving tube during not at same optical axis;
The first judging unit T4 when being used for difference in described first analog signal data and described second analog signal data more than or equal to default value, determines theoretical touch point according to described first analog signal data and described second analog signal data;
The second judging unit T5 is used for judging according to described digital signal data whether the light of infrared transmitting tube is blocked, if then the intersection point situation according to the described light that is blocked filters out true touch point from described theoretical touch point;
Positioning unit T6 is used to obtain the coordinate of described true touch point.
The present invention is by obtaining infrared transmitting tube and the infrared receiving tube receiving tube analog signal data when the same optical axis, the analog signal data of obtaining after analog signal data when comparing original state and the touch, if their difference is more than or equal to default numerical value, then judge to have the touch point, and tentatively determine theoretical touch point; Obtain the not receiving tube digital signal data when same optical axis of infrared transmitting tube and infrared receiving tube, reject pseudo-touch point; Calculate the touch point coordinate time, adopt analog signal data, can improve the accuracy of identification of touch point; Recognition speed when the method for a plurality of touch points of identification of employing digital signal data can improve the identification of a plurality of touch points.
Be not all to be multiple point touching when touching on touch-screen, many times be single-point touches at every turn, during single-point touches and the nonessential digital signal data that obtains infrared receiving tube, to reject pseudo-touch point; During single-point touches, the analog signal data of an infrared receiving tube that need utilization is obtained just can obtain the coordinate of touch point accurately.Can improve the speed of touch point identification like this.Therefore can do further improvement to the foregoing description:
With reference to figure 3, said apparatus also comprises:
The 3rd judging unit T7 is used to judge whether the number of theoretical touch point surpasses one, if, then notify the second judging unit T5 to determine true touch point, if not, then notify positioning unit T6 to obtain the touch point coordinate.
Consider that may there be the situation that does not have the touch point in touch-screen after starting, and can do further improvement to the scheme of the foregoing description:
Through the calculating of the first judging unit T4, if the difference of first analog signal data and second analog signal data is less than default value, the operation of then notifying the first acquiring unit T2 to continue to obtain second analog signal data.
Consider simultaneously, when tiltedly scanning, the situation that the light of infrared transmitting tube is not blocked, can do further improvement to the foregoing description:
The second judging unit T5 judges that the light of infrared transmitting tube is not blocked, and then notifies the first acquiring unit T2 to proceed to obtain the operation of second analog signal data of infrared receiving tube.
When the first judging unit T4 determined theoretical touch point, the while was according to the coordinate of first analog signal data and the second analog signal data theory of computation touch point;
After the second judging unit T5 determines true touch point according to the intersection point situation of the light that is blocked, directly notify positioning unit T6 to obtain the coordinate of true touch point.
Then introducing concrete application examples of the present invention, with reference to figure 4, is that true origin is set up coordinate system XOY as shown in Figure 4 with the lower left corner of touch-screen, on X-direction, has 16 pairs of infrared emission receiving tubes, on Y direction, has 12 pairs of infrared emission receiving tubes; When carrying out vertical scanning, obtain corresponding analog signal data, can tentatively determine 4 touch points: touch point A, touch point B, pseudo-touch point C and pseudo-touch point D according to corresponding analog signal data; Before tiltedly scanning, can not get rid of pseudo-touch point C and pseudo-touch point D; Then tiltedly scan, obtain corresponding digital signal data, judge according to the digital signal data of correspondence whether the light of infrared transmitting tube is blocked then, through judging, existence is blocked, obtain the light that is blocked then, judge according to the intersection point of the light that is blocked which is a real touch point, rejected pseudo-touch point C and pseudo-touch point D through judging.
Through the method for Fig. 4 embodiment, rejected pseudo-touch point; Can use this moment the infrared receiving tube that obtains analog signal data (as, the voltage of infrared receiving tube or current value) calculate the concrete coordinate of touch point.For saving space, to be that example is introduced below with the coordinate that calculates a touch point, please refer to Fig. 5, same, the lower left corner with touch-screen is true origin, setting up coordinate system XOY as shown in Figure 5, is coordinate figure with the address of infrared tube on touch-screen, and perhaps the number that numbers in order with infrared tube is a coordinate figure, on X-direction, there are 16 pairs of infrared emission receiving tubes, on Y direction, have 12 pairs of infrared emission receiving tubes.At present embodiment, with the analog signal data of magnitude of voltage as infrared receiving tube, with infrared tube be numbered coordinate figure (in X-direction, numbering from initial point begin to be followed successively by 1,2,3......16, in Y direction, from initial point begin to be followed successively by 1,2,3......12) be example.
When touch-screen just starts, carry out the vertical scanning of X-axis and Y-axis, obtain the primary simulation signal data of the infrared receiving tube on the X-direction; Obtain the primary simulation signal data of the infrared receiving tube on the Y direction;
When the touch point is arranged, carry out vertical scanning, on X-direction, obtain the analog signal data of infrared receiving tube, change through the magnitude of voltage of relatively finding y3, y4, y5, y6 and y7 with the primary simulation signal data; And the light of infrared receiving tube y3 and each self-corresponding infrared transmitting tube of y7 is not all to be blocked, and obtains the analog signal data ORG[y3 of infrared receiving tube y3 from the primary simulation signal data] and the analog signal data ORG[y7 of infrared receiving tube y7]; When the touch point is arranged, obtain the analog signal data X[y3 of infrared receiving tube y3 in the analog signal data of the infrared receiving tube that scanning obtains] and the analog signal data X[y7 of infrared receiving tube y7];
Then can calculate the coordinate C1 of touch point on X-direction according to following steps:
D1＝X[y3]/ORG[y3]；
D2＝X[y7]/ORG[y7]；
A1＝y3；
A2＝y7-1；
B1＝A1-D1；
B2＝A2+D2；
C1=(B1+B2)/2 so.
On Y direction, obtain the analog signal data of infrared receiving tube, change through the magnitude of voltage of relatively finding z3, z4, z5 and z6 with the primary simulation signal data; And the light of infrared receiving tube z3 and each self-corresponding infrared transmitting tube of z6 is not all to be blocked, and obtains the analog signal data ORG[z3 of infrared receiving tube z3 from the primary simulation signal data that obtains] and the analog signal data ORG[z6 of infrared receiving tube z6]; When the touch point is arranged, obtain the analog signal data Y[z3 of infrared receiving tube z3 in the analog signal data of the infrared receiving tube that scanning obtains] and the analog signal data Y[z6 of infrared receiving tube z6];
Then can calculate the coordinate C2 of touch point on Y direction according to following steps:
D3＝Y[z3]/ORG[z3]；
D2＝Y[z6]/ORG[z6]；
A3＝z3；
A4＝z6-1；
B3＝A3-D3；
B4＝A4+D4；
C2=(B3+B4)/2 so.
Obtain thus the touch point the accurate coordinates value (C1, C2).
To locate the coordinate and the difference that adopts the inventive method calculating touch point coordinate of each touch point to the method for utilizing digital signal identification touch point in the classic method at last: wherein step-length is to weigh the parameter of touch point accuracy of identification, step-length is more little, and then the touch point accuracy of identification is high more;
Tradition adopts in the mode of digital signal identification touch point:
Coordinate precision is: the total fluorescent tube number of step-length=largest logical coordinate figure ÷;
For example:
If the x axle is totally 100 fluorescent tubes, the 2nd, 3,4 signal lamp pipes are hidden, and the largest logical coordinate is 4095, and then step-length is 4095 ÷ 100=41;
And in the inventive method:
Coordinate precision is: the resolution that step-length=the total fluorescent tube of largest logical coordinate figure ÷ is counted ÷ simulating signal acquisition device;
For example:
If the x axle is totally 100 fluorescent tubes, use 8 simulating signal acquisition device (resolution is 256) to obtain simulating signal, the largest logical coordinate is 4095, then step-length=4095 ÷, 100 ÷ 256＜1;
Can reach step-length=1 in theory.This shows that the present invention has improved the accuracy of identification of touch point greatly.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (10)
1. an infrared touch panel touch point recognition methods is characterized in that, comprises step:
The infrared transmitting tube of gating and infrared receiving tube are when same optical axis, do not having to carry out the full screen scanning first time under the situation of touch point, obtain first analog signal data of infrared receiving tube, each scan period is carried out full screen scanning to touch-screen later on, obtains second analog signal data of infrared receiving tube;
The infrared transmitting tube of gating and infrared receiving tube carry out periodic full screen scanning not when same optical axis, obtain the digital signal data of infrared receiving tube;
If the difference of described first analog signal data and described second analog signal data is then determined theoretical touch point according to described first analog signal data and described second analog signal data more than or equal to default value;
Whether the light of judging infrared transmitting tube according to described digital signal data is blocked, if then the intersection point situation according to the described light that is blocked filters out true touch point from described theoretical touch point;
Obtain the coordinate of described true touch point.
2. infrared touch panel according to claim 1 touch point recognition methods, it is characterized in that, after determining described theoretical touch point, comprise step: judge that whether described theoretical touch point is above one, if carry out the described step of obtaining the light that is blocked according to digital signal data; If not, then directly obtain the coordinate of touch point according to described first analog signal data and described second analog signal data.
3. infrared touch panel according to claim 1 touch point recognition methods is characterized in that,
If the difference of described first analog signal data and described second analog signal data is then returned the step of obtaining described second analog signal data less than default value.
4. infrared touch panel according to claim 1 touch point recognition methods is characterized in that,
In the step whether described light of judging infrared transmitting tube according to digital signal data is blocked, the light of described infrared transmitting tube is not blocked, and then returns the described step of obtaining second analog signal data of infrared receiving tube.
5. according to each described infrared touch panel touch point recognition methods of claim 1 to 4, it is characterized in that, when determining described theoretical touch point, simultaneously according to the coordinate of described first analog signal data and the described second analog signal data theory of computation touch point;
After from described theoretical touch point, filtering out the step of true touch point, directly obtain the coordinate of described true touch point.
6. an infrared touch panel touch point recognition device is characterized in that, comprising:
Scanning element is used for touch-screen is carried out full screen scanning;
First acquiring unit, be used for when the infrared transmitting tube of gating and infrared receiving tube during at same optical axis, and when not having the touch point, obtain first analog signal data of infrared receiving tube, and, obtain second analog signal data of infrared receiving tube in the next scan period;
Second acquisition unit is used for obtaining the digital signal data of infrared receiving tube when the infrared transmitting tube of gating and infrared receiving tube during not at same optical axis;
First judging unit when being used for difference in described first analog signal data and described second analog signal data more than or equal to default value, is determined theoretical touch point according to described first analog signal data and described second analog signal data;
Second judging unit is used for judging according to described digital signal data whether the light of infrared transmitting tube is blocked, if then the intersection point situation according to the described light that is blocked filters out true touch point from described theoretical touch point;
Positioning unit is used to obtain the coordinate of described true touch point.
7. infrared touch panel according to claim 6 touch point recognition device is characterized in that, also comprises:
The 3rd judging unit is used to judge whether the number of described theoretical touch point surpasses one, if, then notify described second judging unit to determine true touch point, if not, then notify described positioning unit to obtain the touch point coordinate.
8. infrared touch panel according to claim 6 touch point recognition device is characterized in that, comprising:
If the difference of described first analog signal data of described first judgment unit judges and described second analog signal data then notifies described first acquiring unit to continue to obtain the operation of described second analog signal data less than default value.
9. infrared touch panel according to claim 6 touch point recognition device is characterized in that,
If the light of the described infrared transmitting tube of described second judgment unit judges is not blocked, then notify described first acquiring unit to proceed to obtain the operation of second analog signal data of described infrared receiving tube.
10. according to each described infrared touch panel touch point recognition device of claim 6 to 9, it is characterized in that,
When described first judging unit is determined described theoretical touch point, according to the coordinate of described first analog signal data and the described second analog signal data theory of computation touch point;
Described second judging unit filters out true touch point from described theoretical touch point after, described acquiring unit directly obtains the coordinate of described true touch point.
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| CN102426500B (en) * | 2011-11-16 | 2014-01-01 | 合肥工业大学 | Infrared multi-touch system |
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| CN104216571A (en) * | 2013-05-31 | 2014-12-17 | 上海精研电子科技有限公司 | Touch screen and touch recognition method and device |
| CN103984449B (en) * | 2014-05-30 | 2019-01-18 | 湖州佳格电子科技股份有限公司 | A kind of touch screen touch area localization method |
| CN105204693A (en) * | 2014-06-19 | 2015-12-30 | 青岛海信电器股份有限公司 | Touch point identification method and device and touch screen equipment |
| CN105204693B (en) * | 2014-06-19 | 2019-12-10 | 青岛海信电器股份有限公司 | Touch point identification method and device and touch screen equipment |
| CN104182093A (en) * | 2014-08-04 | 2014-12-03 | 深圳市浪涛科技有限公司 | Multi-point touch recognition confirming method and system for infrared touch screen |
| CN104391612A (en) * | 2014-11-20 | 2015-03-04 | 青岛海信电器股份有限公司 | Method and device for obtaining boundary of touch points |
| CN104391612B (en) * | 2014-11-20 | 2020-10-30 | 海信视像科技股份有限公司 | Method and device for acquiring touch point boundary |
| CN104834413A (en) * | 2015-05-27 | 2015-08-12 | 广州华欣电子科技有限公司 | Recognition method for touch points in infrared touch frame and infrared touch recognizer |
| CN105975139A (en) * | 2016-05-11 | 2016-09-28 | 青岛海信电器股份有限公司 | Touch point extraction method, device and display equipment |
| CN105975139B (en) * | 2016-05-11 | 2019-09-20 | 青岛海信电器股份有限公司 | Touch point extracting method, device and display equipment |
| CN109597529A (en) * | 2018-11-06 | 2019-04-09 | 广州华欣电子科技有限公司 | Infrared touch screen positioning method, device, equipment and medium |
| CN111736724A (en) * | 2020-06-04 | 2020-10-02 | 广州拓普斯电子科技有限公司 | Multi-point touch identification method of infrared touch screen |
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