CN102662533B - Method for eliminating non-normal contact interference in infrared touch system - Google Patents
Method for eliminating non-normal contact interference in infrared touch system Download PDFInfo
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Abstract
A method for eliminating non-normal contact interference in an infrared touch system comprises (1) starting up under the condition that a display screen doesn't display any objects, initializing a touch screen, and establishing an environment value; (2) detecting whether a barrier exists on the display screen; (3) judging whether the barrier is a non-normal contact barrier, executing the step (4) if yes, otherwise executing the step (6); (4) subtracting a display region corresponding to the non-normal barrier from a whole display region of the display screen; (5) recalculating the rest display region by using a common position coordinates detection algorithm to obtain a new display region capable of normally operating; and (6) entering a normal operating state. The invention can be realized only by updating software, without redesigning and updating hardware of an infrared touch frame. In addition, only partial program of firmware in a lower computer system belonging to the touch frame is updated, and an upper computer system and application software are not required to change.
Description
Technical field
The present invention relates to improper contact interference method in a kind of elimination infrared touch system.
Background technology
Improper contact described in the present invention refers to: generally, and in infrared touch detection method, user is by finger, or special Pointer contacts screen realizes touch control operation; The abnormalities contact mentioned in the present invention refers to: in infrared touch frame sensing range, have non-user to be expected to be useful in the object contact Touch Screen of operation, thus cause interference phenomenon to user's normal running; Usually, the peripheral shape that this type of improper contact has a contact screen is obviously greater than user's normal running contact shape (as: teacup, palmar aspect etc., its contact area is obviously greater than the area of finger or Pointer contacts screen under normal operation).
In technical field of touch control, it is the large key difficulties that puzzlement touch-control is researched and developed immediately that the true contact position caused due to external interference detects Problem of Failure always.External interference is divided by exposure level, mainly can be divided into untouchable interference and contact interference.For the former, for different touch-control actualizing technology, various interference source is different.Such as capacitive touch control techniques, stray capacitance is the principal element causing position to detect interference; And for infrared touch technology, the interference of surround lighting is then one of main interference source; But the present invention does not set off a discussion for these untouchable interference sources, launches mainly for contact interference source.
The patent No. is the Chinese patent application of 200610011193.6, discloses a kind of foil gauge and acoustic pickup of utilizing to the vibration detecting touch force and produced by touch force to confirm the technical scheme of touch operation.Although this technical scheme can solve the problem of above-mentioned false triggering, also there are some shortcomings.First, if use foil gauge, more semiconductor foil gauge in general to be used could to obtain enough sensitivity, this adds increased the components and parts cost of product; If secondly use acoustic pickup to detect vibration, because the frequency band of acoustic pickup is very wide, be then easily subject to the interference of touch-screen ambient noise; If eliminate this interference just to need to drop into more cost in circuit design and signal transacting, production cost can be increased equally.
For this reason, number of patent application is the patent documentation of 200710063564, disclose one with capacitive touch control techniques for starting point, conductor characteristics that provide a kind of low cost, that utilize human body, the technical scheme of the accuracy of touch recognition is promoted by capacity coupled mode, for detecting the touch electric signal produced by the stray capacitance between human body and touch-screen, to detect the operation of true position of touch.This method to some extent solves the touch-control interference of non-finger class environmental objects.Such as one is dropped on the winged insect on screen, or larger-size floating thing, and other accidental stops etc., and the method all may identify, and avoids causing misoperation.
, along with the development of LED technology, no matter consider from accuracy of detection or system cost angle, infrared touch method just more and more becomes the main flow of touch technology at present.And the anti-interference method that above two patent documentations are mentioned, be only by two kinds of new method for sensing: power detects and capacitance detecting, solve the improper contact interference problem of technical field of touch control, infrared technical field of touch control can not be directly used in.For this reason, the patent No. is the patent documentation of 200810027773.3, disclose one " multi-point locating anti-interference processing method of touch-screen positioning system " and inquire into a kind of method that anti-abnormalities that can be used under infrared touch condition touches interference specially, it is by the judgement of Initial Detection Point position and supervise, on screen, virtual grate goes out effective Petting Area and interference range, in realizing, it is the setting by timer and interference indicator position, when there is multiple spot interference in process, interfere information can be removed, normal touch is operated unaffected, particularly effectively can overcome user's interference due to coat-sleeve when screen is write, the coordinate data that system-computed is made mistake and the system perturbations situation caused.But the method has a precondition: when must detect at the beginning, and screen can only have and only have a touch point, is judged afterwards by tracking; If the more than touch point of screen at the beginning, then coordinate information is several times needed before abandoning to judge again.This is rather too harsh for practical operation condition.
Therefore, the present invention is from the one dimension voltage signal detection angles of infrared output, and the abnormalities launched under infrared condition contacts anti-interference discussion, and not by strict demand restriction single-contact during initial detecting.
Summary of the invention
In order to overcome the problems referred to above, the present invention provides a kind of situation being obviously greater than a class contact interference infrared touch screen of the normal running thing contacts area such as finger or pointer specially for contact area to society, propose a kind of based on improper contact interference method in the elimination infrared touch system of infrared receiving tube output one dimension voltage signal Continuity Analysis, the impact that this type of improper contact interference detects for finger one class touch coordinate position can be rejected simply and effectively, user is made to have cup, during the infrared touch area of the object contacts such as palm, also normally touch-control system can be used.
Technical scheme of the present invention is to provide improper contact interference method in a kind of elimination infrared touch system, comprises the steps,
(1), under the condition of display screen without any object, energising start, carries out touch-screen initialization, sets up environment value;
(2), initially complete after, detection display screen on whether have shelter; If any, then enter (3) step; As nothing, then enter (6) step;
(3), judge whether this shelter is improper contact shelter; In this way, then enter (4) step, as no, then enter (6) step;
(4), the viewing area corresponding to improper shelter is deducted with the whole viewing area of display screen;
(5), by the conventional position coordinates detection algorithm in residue viewing area recalculate, the viewing area that can normally act on that must make new advances;
(6), normal operating condition is entered.
As improvement of the present invention, described (1) step comprises the steps,
(11), from side drive horizontal infraluminescence pipe or longitudinal infraluminescence pipe successively, and record the horizontal infrared receiver initial voltage of horizontal infrared receiving tube or longitudinal infrared receiver initial voltage of longitudinal infrared receiving tube successively;
(12), from side drive longitudinal infraluminescence pipe or horizontal infraluminescence pipe successively, and record longitudinal infrared receiver initial voltage of longitudinal infrared receiving tube or the horizontal infrared receiver initial voltage of horizontal infrared receiving tube successively;
(13), horizontal infrared receiver initial voltage and longitudinal infrared receiver initial voltage are recorded in respectively in the storer that main control chip or main control chip can access.
As to further improvement of the present invention, described (2) step comprises the steps,
(21) drive the transverse direction of horizontal stroke, vertical both direction or longitudinal infrared transmitting tube, successively, sample and preserve the horizontal infrared receiving tube scanning voltage of all transverse directions (x direction), and longitudinal infrared receiving tube scanning voltage in longitudinal x direction;
(22), by horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage, and longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage are compared; If the absolute value of the difference of horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage is equal to or less than horizontal threshold value voltage, and the absolute value of the difference of longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage is equal to or less than longitudinal threshold value voltage, be then judged as have no occluder; If the absolute value of the difference of horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage is greater than horizontal threshold value voltage, and the absolute value of the difference of longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage is greater than longitudinal threshold value voltage, be then judged as shelter.
As to further improvement of the present invention, described (3) step comprises the steps,
(31), set up laterally (x direction) scanning and block mark array THRx [N], whether wherein N represent laterally (x direction) infraluminescence pipe/infrared receiving tube logarithm, and to the clearing of array all elements, have object to block for leaving position i in;
(32), scanning laterally (x direction) all infraluminescence pipe/infrared receiving tubes pair, record is all horizontal infrared receiving tube scanning voltages laterally, then compare with horizontal infrared receiver initial voltage, if the absolute value of the difference of the horizontal infrared receiving tube scanning voltage of position i and horizontal infrared receiver initial voltage is greater than horizontal threshold value voltage, then by i-th element set in array THRx [N];
(33), mark array THRx [N] is blocked to transverse direction (x direction) scanning, add up as follows: if horizontal (x direction) scanning blocks in mark array THRx [N] to have exceed predetermined continuous Sx " 1 " element existence, be then judged as having shelter to exist horizontal;
The element that laterally (x direction) scanning is blocked in these the continuous positions marked in array THRx [N] is set to " 0 " again; The size of Sx is determined by following formula:
Sx?=?WNx?/?dx，
Wherein, the abnormalities contact chaff interference removed is wished in WNx representative, to the minimum widith blocked that transverse direction (x direction) causes on screen contact, dx represent between horizontal (x direction) adjacent luminotron or adjacent reception tube pitch from;
(34), set up longitudinally (y direction) scanning and block mark array THRy [M], whether M represents horizontal y direction luminotron/receiving tube logarithm, and resets array all elements, have object to block for leaving position j in;
(35), scanning longitudinally (y direction) all luminotron/receiving tubes pair, record all longitudinal infrared receiving tube scanning voltages, compare with longitudinal infrared receiver initial voltage VINTyi, if the absolute value of the difference of longitudinal infrared receiving tube scanning voltage Vyj of position j and longitudinal infrared receiver initial voltage VINTyi is greater than longitudinal threshold value voltage, then longitudinally (y direction) scanning will block a jth element set in mark array THRy [M];
(36), mark array THRy [M] is blocked to longitudinal direction (y direction) scanning, add up as follows: if longitudinal (y direction) scanning blocks in mark array THRy [M] to have exceed predetermined continuous Sy " 1 " element existence, be then judged as having shelter to exist horizontal;
The element that longitudinally (y direction) scanning is blocked in these the continuous positions marked in array THRy [M] is set to " 0 " again; The size of Sy is determined by following formula:
Sy?=?WNy?/?dy，
Wherein, the abnormalities contact chaff interference removed is wished in WNy representative, to the minimum widith blocked that longitudinal direction (y direction) causes on screen contact, dy represent between longitudinal (y direction) adjacent luminotron or adjacent reception tube pitch from.
As to further improvement of the present invention, the conventional position coordinates detection algorithm described in (5) step is continuous voltage relative method.
The present invention proposes a kind of one dimension voltage signal Continuity Analysis method exported based on infrared receiving tube, for getting rid of the interference that the contact of some abnormalities detects infrared touch screen contact position.User is to infrared touch frame, general employing is single, or multiple finger, or special pointer realizes the operation to system, these operating articles usually have a common feature: the peripheral shape of object and screen contact is similar to circle, and area (relative to display screen) is less; Could realize higher position of touch accuracy of detection in infrared touch frame sensing range like this.
But in vertical touch system, user can by whole palm contacts to screen sometimes, and at this moment infrared touch system is difficult to the tram coordinate continuing to detect normal touch point; In horizontal touch system (as desktop touch-control system), sometimes user can place the improper contact objects such as such as cup on screen, similarly, disturb by these abnormalities object contacts, infrared touch system is also difficult to correctly identify the finger of user or the tram coordinate of pointer.
And the present invention only by the renewal of software, can be able to realize, do not need to redesign the hardware of infrared touch frame and upgrade; In addition, needing the software section upgraded also to be only limitted to belonging to the firmware portions program updates of lower computer system touching frame, not needing to make any amendment to the driver of master system and application software.Therefore, the method can conveniently be applied in current existing infrared touch-control system.
Accompanying drawing explanation
Fig. 1 is the principle process schematic diagram that the present invention resists improper contact interference method.
Fig. 2 is horizontal direction scanning schematic diagram.
Fig. 3 is in Fig. 1 (3) and a kind of embodiment principle process schematic diagram of (4) step.
Embodiment
Refer to Fig. 1, the invention provides improper contact interference method in a kind of elimination infrared touch system, comprise the steps,
(1), under the condition of display screen without any object, energising start, carries out touch-screen initialization, sets up environment value;
(2), initially complete after, detection display screen on whether have shelter; If any, then enter (3) step; As nothing, then enter (6) step;
(3), judge whether this shelter is improper contact shelter; In this way, then enter (4) step, as no, then enter (6) step;
(4), the viewing area corresponding to improper shelter is deducted with the whole viewing area of display screen;
(5), by the conventional position coordinates detection algorithm in residue viewing area recalculate, the viewing area that can normally act on that must make new advances;
(6), normal operating condition is entered.
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3, an embodiment of the present invention is described in more detail: in general infrared touch detection system, usual main control chip first drives the infraluminescence pipe in certain direction successively, the present invention only with first transverse direction, rear longitudinal sequential deployment explanation; Can certainly first longitudinally, rear give to sequential deployment explanation.Touch-screen initialization (i.e. (1) step), when horizontal infraluminescence pipe Txi is lit, on its corresponding limit, the horizontal infrared receiving tube Rxi of same position is also opened immediately.If suppose there is no extraneous touching object in this position, this horizontal Infrared Lxi can directly inject horizontal infrared receiving tube Rxi from lateral luminous pipe Txi, the horizontal infrared receiver initial voltage VINTxi of record horizontal infrared receiving tube Rxi now, and it can be used as initial detecting voltage, be recorded in the storer that main control chip or main control chip can access, after having driven transverse direction whole horizontal infraluminescence pipe Txi and horizontal infrared receiving tube Rxi successively, drive longitudinal infraluminescence pipe Tyj and longitudinal infrared receiving tube Ryj as a same reason successively, when longitudinal infraluminescence pipe Tyj is lit, on its corresponding limit, longitudinal infrared receiving tube Ryj of same position is also opened immediately, if suppose there is no extraneous touching object in this position, this longitudinal Infrared Lyj can directly inject longitudinal infrared receiving tube Ryj from longitudinal infraluminescence pipe Tyj, longitudinal infrared receiver initial voltage VINTyj of record longitudinal infrared receiving tube Ryj now, and it can be used as initial detecting voltage, be recorded in the storer that main control chip or main control chip can access.
In follow-up position coordinates computation process (i.e. (2) step), drive horizontal stroke successively, the transverse direction of vertical both direction or longitudinal infrared transmitting tube, then sample and preserve the horizontal infrared receiving tube scanning voltage Vxi of all transverse directions (x direction), and after longitudinal infrared receiving tube scanning voltage Vyj in longitudinal (y direction), use contact position algorithm routine, by the horizontal infrared receiver initial voltage VINTxi of horizontal infrared receiving tube scanning voltage Vxi with horizontal (x direction), and longitudinal infrared receiving tube scanning voltage Vyj and longitudinal infrared receiver initial voltage VINTyj in longitudinal (y direction) are compared, if in transverse direction (x direction)
| Vxi – VINTxi|> VTHRx, (formula 1)
Or/and longitudinally (y direction)
| Vyj – VINTyj|> VTHRy, (formula 2)
System then judges at transverse direction (x direction) coordinate as i, and longitudinally (y direction) coordinate is that the position of j has object to block, and down-stream output coordinate (i, j) is as the position coordinates of touch point.
If in transverse direction (x direction)
| Vxi – VINTxi|<=VTHRx, (formula 3)
Or/and longitudinally (y direction)
| Vyj – VINTyj|<=VTHRy, (formula 4)
System then judge horizontal direction coordinate as, the position that longitudinal direction coordinate is does not have object to block,
In formula, Vxi is horizontal infrared receiving tube scanning voltage; VINTxi is horizontal infrared receiver initial voltage; VTHRx is horizontal threshold value voltage; Vyj is longitudinal infrared receiving tube scanning voltage; VINTyj is longitudinal infrared receiver initial voltage; VTHRy is longitudinal threshold value voltage.
The horizontal threshold value voltage VTHRx of above formula (1) to the transverse direction (x direction) in formula (4) and longitudinal threshold value voltage VTHRy in longitudinal (y direction), its concrete value and infrared transmitting tube that different product adopts and infrared receiving tube, and the different frame size that touches is correlated with.
As explained above, add and have external interference thing to touch (i.e. (3) step), algorithms most in use still can calculate corresponding position coordinates, can produce interference like this to infrared touch system.The present invention is on above conventional contact position coordinate measurement basis, add the interference of out of size contactant and remove algorithm (core of this algorithm is the view field of interference-shielded thing in x and y direction), eliminate such as palm, teacup etc. one class contact area be obviously greater than the interference of finger touch area.Specifically " out of size contactant algorithm of interference " is as follows:
(31). setting up laterally (x direction) scanning and block mark array THRx [N] (note: N represents laterally (x direction) luminotron/receiving tube logarithm), and array all elements is reset, whether having object to block for leaving position i in;
(32). scanning is (x direction) all luminotron/receiving tubes pair laterally, record is all horizontal infrared receiving tube scanning voltage Vxi (i=1 laterally, 2,3, N, N are lateral luminous pipe receiving tube logarithm), then compare with horizontal infrared receiver initial voltage VINTxi, if the difference of the horizontal infrared receiving tube scanning voltage Vxi of position i and horizontal infrared receiver initial voltage meets formula (1), then by i-th element set in array THRx [N];
(33). after completing transverse direction (x direction) scanning of above-mentioned steps 32, mark array THRx [N] is blocked to transverse direction (x direction) scanning, add up as follows: if horizontal (x direction) scanning blocks in mark array THRx [N] to have exceed predetermined continuous Sx " 1 " element existence, be then judged as having shelter to exist in transverse direction (x direction);
(41), the element that laterally (x direction) scanning is blocked in these the continuous positions marked in array THRx [N] is set to " 0 " again.The size of Sx is determined by following formula:
Sx=WNx/dx, (formula 5)
Wherein, the abnormalities contact chaff interference removed is wished in WNx representative, and to the minimum widith blocked that transverse direction (x direction) causes on screen contact, dx represents laterally (namely between adjacent closed tube) distance between (x direction) adjacent luminotron;
If laterally (x direction) scanning is blocked in mark array THRx [N] and do not exceeded predetermined continuous Sx " 1 " element, then enter
(34). setting up longitudinally (y direction) scanning and block mark array THRy [M] (note: M represents horizontal y direction luminotron/receiving tube logarithm), and array all elements is reset, whether having object to block for leaving position j in;
(35). scanning is (y direction) all luminotron/receiving tubes pair longitudinally, record all longitudinal infrared receiving tube scanning voltage Vyj (j=1,2,3, M, M is longitudinal luminotron receiving tube logarithm), then compare with longitudinal infrared receiver initial voltage VINTyi, if the difference of longitudinal infrared receiving tube scanning voltage Vyj of position j and longitudinal infrared receiver initial voltage VINTyi meets formula (2), then longitudinally (y direction) scanning will block a jth element set in mark array THRy [M];
(36). after longitudinal direction (y direction) scanning of completing steps 35, mark array THRy [M] is blocked to longitudinal direction (y direction) scanning, add up as follows: if longitudinal (y direction) scanning blocks in mark array THRy [M] to have exceed predetermined continuous Sy " 1 " element existence, be then judged as having shelter to exist in longitudinal direction (y direction);
(42), the element that longitudinally (y direction) scanning is blocked in these the continuous positions marked in array THRy [M] is set to " 0 " again.The size of Sy is determined by following formula:
Sy=WNy/dy, (formula 6)
Wherein, the abnormalities contact chaff interference removed is wished in WNy representative, and to the minimum widith blocked that longitudinal direction (y direction) causes on screen contact, dy represents longitudinally (namely between adjacent closed tube) distance between (y direction) adjacent luminotron.
After above anti-interference step, two that obtain transverse direction (x direction) and longitudinally (y direction) block statistics array, namely laterally (x direction) scanning is blocked mark array THRx [N] and is scanned to block with longitudinally (y direction) and mark array THRy [M], re-use conventional position coordinates detection algorithm (i.e. (5) step), can calculate and have the normal touch position under abnormalities contactant disturbed condition to detect, as the position coordinates detection algorithm adopting continuous voltage relative method etc. to commonly use.Enter normal use (i.e. (6) step).
Repeat above-mentioned (31) to (36), (41), (42) and (5) step, start frame arithmetic.
Claims (2)
1. eliminate an improper contact interference method in infrared touch system, it is characterized in that: comprise the steps,
(1), under the condition of display screen without any object, energising start, carries out touch-screen initialization, sets up environment value;
(2), initially complete after, detection display screen on whether have shelter; If any, then enter (3) step; As nothing, then enter (6) step;
(3), judge whether this shelter is improper contact shelter; In this way, then enter (4) step, as no, then enter (6) step;
(4), the viewing area corresponding to improper shelter is deducted with the whole viewing area of display screen;
(5), by the conventional position coordinates detection algorithm in residue viewing area recalculate, the viewing area that can normally act on that must make new advances;
(6), normal operating condition is entered;
Wherein, described (3) step comprises the steps,
(31), set up transversal scanning block mark array THRx [N], wherein N represents horizontal infraluminescence pipe/infrared receiving tube logarithm, and to array all elements reset, whether have object to block for leaving position i in;
(32), scanning laterally all infraluminescence pipe/infrared receiving tubes pair, record is all horizontal infrared receiving tube scanning voltages laterally, then compare with horizontal infrared receiver initial voltage, if the absolute value of the difference of the horizontal infrared receiving tube scanning voltage of position i and horizontal infrared receiver initial voltage is greater than horizontal threshold value voltage, then by i-th element set in array THRx [N];
(33), to transversal scanning block mark array THRx [N], add up as follows: if transversal scanning blocks in mark array THRx [N] to have exceed predetermined continuous Sx " 1 " element existence, be then judged as laterally having shelter to exist;
Element transversal scanning blocked in these the continuous positions in mark array THRx [N] is set to " 0 " again; The size of Sx is determined by following formula:
Sx?=?WNx?/?dx，
Wherein, the abnormalities contact chaff interference removed is wished in WNx representative, to the minimum widith blocked laterally caused on screen contact, dx represent between horizontal adjacent luminotron or adjacent reception tube pitch from;
(34), set up longitudinal scanning block mark array THRy [M], M represents horizontal y direction luminotron/receiving tube logarithm, and to array all elements reset, whether have object to block for leaving position j in;
(35), scanning longitudinally all luminotron/receiving tubes pair, record all longitudinal infrared receiving tube scanning voltages, compare with longitudinal infrared receiver initial voltage VINTyi, if the absolute value of the difference of longitudinal infrared receiving tube scanning voltage Vyj of position j and longitudinal infrared receiver initial voltage VINTyi is greater than longitudinal threshold value voltage, then longitudinal scanning is blocked a jth element set in mark array THRy [M];
(36), to longitudinal scanning block mark array THRy [M], add up as follows: if longitudinal scanning blocks in mark array THRy [M] to have exceed predetermined continuous Sy " 1 " element existence, be then judged as laterally having shelter to exist;
The element blocked by longitudinal scanning in these the continuous positions in mark array THRy [M] is set to " 0 " again; The size of Sy is determined by following formula:
Sy?=?WNy?/?dy，
Wherein, the abnormalities contact chaff interference removed is wished in WNy representative, to the minimum widith blocked longitudinally caused on screen contact, dy represent between longitudinal adjacent luminotron or adjacent reception tube pitch from.
2. improper contact interference method in elimination infrared touch system according to claim 1, is characterized in that: described (1) step comprises the steps,
(11), from side drive horizontal infraluminescence pipe or longitudinal infraluminescence pipe successively, and record the horizontal infrared receiver initial voltage of horizontal infrared receiving tube or longitudinal infrared receiver initial voltage of longitudinal infrared receiving tube successively;
(12), from side drive longitudinal infraluminescence pipe or horizontal infraluminescence pipe successively, and record longitudinal infrared receiver initial voltage of longitudinal infrared receiving tube or the horizontal infrared receiver initial voltage of horizontal infrared receiving tube successively;
(13), horizontal infrared receiver initial voltage and longitudinal infrared receiver initial voltage are recorded in respectively in the storer that main control chip or main control chip can access.
3
.improper contact interference method in elimination infrared touch system according to claim 1 and 2, is characterized in that: described (2) step comprises the steps,
(21) drive the transverse direction of horizontal stroke, vertical both direction or longitudinal infrared transmitting tube, successively, sample and preserve all horizontal horizontal infrared receiving tube scanning voltages, and longitudinal infrared receiving tube scanning voltage in longitudinal x direction;
(22), by horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage, and longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage are compared; If the absolute value of the difference of horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage is equal to or less than horizontal threshold value voltage, and the absolute value of the difference of longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage is equal to or less than longitudinal threshold value voltage, be then judged as have no occluder; If the absolute value of the difference of horizontal infrared receiving tube scanning voltage and horizontal infrared receiver initial voltage is greater than horizontal threshold value voltage, and the absolute value of the difference of longitudinal infrared receiving tube scanning voltage and longitudinal infrared receiver initial voltage is greater than longitudinal threshold value voltage, be then judged as shelter.
4
.improper contact interference method in elimination infrared touch system according to claim 1, is characterized in that: the conventional position coordinates detection algorithm described in (5) step is continuous voltage relative method.
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| CN103902104B (en) * | 2012-12-25 | 2017-03-08 | 北京汇冠新技术股份有限公司 | Scan data analysis method and device for infrared touch panel |
| CN103744558B (en) * | 2013-11-28 | 2017-01-18 | 苏州长风航空电子有限公司 | Intelligent dead point recognition and self-adaptation compensation method for infrared touch screen |
| CN113934312B (en) * | 2020-06-29 | 2023-10-20 | 深圳市创易联合科技有限公司 | Touch object identification method based on infrared touch screen and terminal equipment |
| CN112445380B (en) * | 2020-12-08 | 2022-04-01 | 安徽鸿程光电有限公司 | Infrared touch control method, device and all-in-one machine |
| CN112650414B (en) * | 2020-12-30 | 2024-03-22 | 安徽鸿程光电有限公司 | Touch device, touch point positioning method, module, equipment and medium |
| CN114201079B (en) * | 2021-12-06 | 2023-09-22 | 苏州长风航空电子有限公司 | Reliability verification method and system for infrared touch screen |
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