WO2008154792A1 - Ecran tactile infrarouge et procédé de positionnement tactile multipoint - Google Patents

Ecran tactile infrarouge et procédé de positionnement tactile multipoint Download PDF

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Publication number
WO2008154792A1
WO2008154792A1 PCT/CN2008/000847 CN2008000847W WO2008154792A1 WO 2008154792 A1 WO2008154792 A1 WO 2008154792A1 CN 2008000847 W CN2008000847 W CN 2008000847W WO 2008154792 A1 WO2008154792 A1 WO 2008154792A1
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WO
WIPO (PCT)
Prior art keywords
infrared
infrared receiving
touch
emitting element
receiving
Prior art date
Application number
PCT/CN2008/000847
Other languages
English (en)
Chinese (zh)
Inventor
Ruxi Lu
Chunjing Zhou
Junming Li
Original Assignee
Vtron Technologies Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNB200710028616XA external-priority patent/CN100527066C/zh
Priority claimed from CNA2007100310826A external-priority patent/CN101149656A/zh
Priority claimed from CN2008100257053A external-priority patent/CN101226446B/zh
Application filed by Vtron Technologies Ltd. filed Critical Vtron Technologies Ltd.
Publication of WO2008154792A1 publication Critical patent/WO2008154792A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/048—Indexing scheme relating to G06F3/048
    • G06F2203/04808—Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen

Definitions

  • the invention relates to an infrared touch screen, in particular to an infrared touch screen and a multi-touch positioning method capable of distinguishing a plurality of touch points and simultaneously operating.
  • the basic structure of the infrared touch screen is to install a plurality of pairs of infrared emitting and infrared receiving elements in a certain order on a peripheral edge of a display surface suitable for mounting.
  • the transmitting and infrared receiving components form a transmitting and receiving pair in a one-to-one correspondence manner, and form a mutually perpendicular transmitting and receiving array along the edge of the display surface, and each pair of transmitting is respectively turned on in a certain order under the control of the microcomputer system.
  • an infrared receiving component that detects whether infrared rays between each pair of infrared emitting and infrared receiving elements are blocked, thereby determining whether a touch event occurs.
  • the existing infrared touch screen system In the existing infrared touch screen system, light forms a grid structure on the display surface, and when a touch is detected, the position of the grid node where the touch occurs is determined to calculate the position coordinate at which the touch event occurs.
  • This touch detection mode allows the existing infrared touch screen to receive only a unique set of position coordinate data for a given period of time, so when there is only one touch point, the touch screen can work normally, for two or more touch points At the same time, the system will calculate the wrong position coordinates, resulting in the reported touch location not being the actual touch location.
  • the existing infrared touch screen technology will be ineffective in some situations where multi-touch is required, such as multi-player simultaneous games, multiple people writing at the same time, etc., which greatly limits the field of use of the infrared touch screen.
  • the present invention proposes three technical solutions based on a general inventive concept.
  • the common features of the three technical solutions are: In at least one detecting direction of the touch screen, an infrared emitting element emits light by an infrared receiving element. The reception detection is also detected by another infrared receiving component.
  • a circuit structure for an infrared touch screen system has the following changes in the circuit structure design of the conventional infrared touch screen circuit:
  • In the at least one detection direction of the touch screen there is a set of infrared emission scanning circuits corresponding to two 3 ⁇ 4 infrared receiving scanning circuits
  • a set of infrared emission scanning circuits corresponds to a set of infrared receiving scanning circuits.
  • a set of receive scanning circuits can be corresponding to two sets of transmit scan circuits at different times.
  • the scanning detection method is: a light emitted by an infrared emitting component in an infrared transmitting scanning circuit is received and detected by an infrared receiving component of a set of infrared receiving scanning circuits, and there is another set of infrared receiving scanning circuits.
  • the infrared receiving component receives the detection.
  • a set of infrared emission scanning circuits includes a plurality of infrared emitting elements, and a set of infrared receiving scanning circuits includes the same number of infrared receiving elements. During operation, the infrared emitting elements of the same scanning circuit are turned on one by one, and the corresponding infrared receiving elements of a set of scanning circuits are also connected one by one to receive.
  • the reason for adopting this method is as follows: If a plurality of receiving elements in the infrared receiving scanning circuit are simultaneously received, it is necessary to add more analog-to-digital conversion circuits, and at the same time, the single-chip microcomputer is required to simultaneously acquire multiple analog signals, thus making the touch screen circuit
  • the system is complicated, which increases the difficulty of circuit implementation. It is not conducive to the development of touch screens in the direction of miniaturization and portability.
  • the infrared transmission/reception scanning circuit referred to in the present invention may be an independent circuit board divided by hardware, or may be a circuit unit or a scanning unit which is logically divided on the same circuit board.
  • the touch screen algorithm program of the present invention includes a touch point pre-detection algorithm module for determining the touch point range in advance, and can detect the position of the touch point according to the calculation formula by detecting the change of the output value of the corresponding infrared receiving element. Thereby achieving multi-touch positioning.
  • the circuit structure of the present invention can take the form that: the infrared emitting circuit board has the same total length as the receiving circuit board, and the length of the single infrared transmitting circuit board is twice that of the single receiving circuit board, so that there is one or two receiving circuit boards and one Corresponding to the transmitting circuit board; the corresponding relationship between the infrared emitting element and the infrared receiving element is from the original pair of strains, and one infrared emitting element corresponds to one or two infrared receiving elements, and the corresponding relationship between the infrared emitting element and the infrared receiving element includes positive correspondence A non-positive correspondence of a certain angle, the size of the angle can be determined according to actual needs.
  • the circuit structure of the present invention may also adopt another form: the number and length of the infrared transmitting circuit board and the infrared receiving circuit board are equal, and the infrared emitting circuit board is divided into a plurality of transmitting scanning units, each of which contains a certain number of The infrared emitting element, the infrared receiving circuit board is also divided into a plurality of receiving scanning units, the number of divided scanning units divided is twice that of the transmitting scanning unit, and one transmitting scanning unit corresponds to one or two receiving scanning units.
  • the corresponding relationship between the infrared emitting element and the infrared receiving element is also one infrared receiving element corresponding to one or two infrared receiving elements, and the corresponding relationship between the infrared emitting element and the infrared receiving element includes a non-correspondence of positive correspondence and a certain angle, the clip The size of the corner can be determined according to actual needs.
  • the circuit structure of the present invention can also take another form: the number of infrared transmitting circuit boards and infrared receiving circuit boards The lengths are equal, the infrared emitting circuit board is divided into a plurality of transmitting scanning units, each of the transmitting scanning units includes a certain number of infrared emitting elements, and the infrared receiving circuit board is also divided into the same number of receiving scanning units, and one transmitting scanning unit corresponds to one Or two receiving scanning units.
  • the corresponding relationship between the infrared emitting element and the infrared receiving element is also one infrared receiving element corresponding to one or two infrared receiving elements, and the corresponding relationship between the infrared emitting element and the infrared receiving element includes a non-correspondence of positive correspondence and a certain angle, the clip The size of the corner can be determined according to actual needs.
  • the correspondence between the infrared emitting element and the infrared receiving element may be performed by using all or most of the infrared emitting elements and/or the infrared receiving elements to be deflected at a certain angle.
  • the signal of the infrared emitting component can be prevented from interfering with other infrared receiving components symmetrical with the corresponding component, so as to avoid interference with the normal operation of the system and cause misjudgment.
  • This correspondence can also be achieved by selecting a component having a larger emission angle than a normal infrared component.
  • the circuit board equipped with the infrared emitting element and the circuit board equipped with the infrared receiving component respectively operate according to their respective timings, and the correspondence between the timings can be adjusted as needed;
  • the timing correspondence between the transmitting board and the receiving board includes but is not limited to The following two:
  • the timing of adjacent emitter boards is different, and the timing of the separated emitter boards is the same. In this case, only half of the number of receiving boards has the same timing as the transmitting board.
  • the receiving boards with the same timing can be odd-numbered receiving boards or even-numbered receiving boards, depending on the circuit structure. The design needs; and the timing of the other half of the receiving board needs to change as the corresponding relationship of the transmitting board changes, and the timing of the transmitting board corresponding to the moment remains the same.
  • the timing of the transmitting board changes stepwise, and the timing of the receiving board is consistent with the corresponding transmitting board timing according to the corresponding relationship.
  • timing design is to prevent the interference of adjacent infrared components, so that the method of the present invention can be smoothly implemented, and the design principle of the timing is in the patent of the application no. 200610126079. 8 anti-interference type infrared touch device and positioning method There is a detailed description in the file, which is not discussed here.
  • the infrared transmitting and receiving elements in the horizontal array are different from the infrared transmitting and receiving elements in the vertical array to avoid the infrared emitting between the infrared receiving elements. interference.
  • a 940 nm infrared emission receiving element is used in the lateral array
  • an 850 nm infrared emission receiving element is used in the vertical array, so that in the detection area of the corner, adjacent infrared transmitting and receiving elements do not interfere with each other.
  • the touch detection algorithm of the touch screen system of the present invention in addition to the position coordinate calculation program for calculating the position where the touch event occurs, there is also a touch point pre-detection algorithm module capable of detecting the output value of the corresponding infrared receiving element. Change, predetermine the position of the touch point according to the calculation formula. In this way, for simultaneous multi-touch events, the touch screen system can predetermine a certain nearby area while determining the occurrence of a touch event. Whether there are additional touch points in the domain and marking them, combined with further detection data, the position coordinates of the plurality of touch points can be calculated.
  • the method for realizing multi-touch positioning of the present invention mainly includes the following steps:
  • the infrared emitting elements are sequentially turned on, and the corresponding infrared receiving elements are turned on according to a certain timing correspondence;
  • step 3 after determining that a touch event has occurred, the touch position coordinates may be calculated using a normal touch position detection algorithm.
  • step 4 the touch point pre-detection algorithm is used to predetermine the area where the touch event occurs and calculate the possible touch point position.
  • the area where the touch event occurs is marked, and this area is the area between the infrared receiving elements corresponding to the infrared emitting elements that are turned on at that time.
  • X represents the distance between the two infrared receiving elements corresponding to the infrared emitting element
  • a represents the angle between the line connecting the infrared receiving element and the horizontal line of the infrared emitting element
  • P represents the infrared emitting element and the corresponding two infrared rays. The angle between the wires connecting the receiving components.
  • X represents the distance between the infrared receiving element corresponding to the infrared emitting element to the infrared receiving element at a certain angle with the infrared emitting element, and the non-positive corresponding infrared receiving element
  • ⁇ represents the connection between the infrared emitting element and the corresponding corresponding infrared receiving element The angle between the line and the infrared emitting element and the line connecting the non-positive corresponding infrared receiving element.
  • multi-touch positioning can be achieved with only one direction of detection.
  • the two directions can be used to comprehensively judge the data. For example, when the touch point is close to the corner area, the pre-detection algorithm cannot be used or when the plurality of touch points approach the overlap of the mark area in a small area, it is necessary to perform comprehensive judgment in combination with the detection data of the two directions.
  • the infrared touch screen system can distinguish multiple touch points that are simultaneously touched, so that multi-touch positioning can be realized on the infrared touch screen.
  • the moving tendency of each touch point can be determined, according to which different touch operation functions can be defined, for example, the opposite directions of the two touch points indicate that the zooming or zooming operation is performed; The touch point does not move, and the other touch point performs an arc motion, indicating that the rotation operation is performed, etc., and the functions that the single touch system cannot perform are completed, and all of these functions can be flexibly defined by the corresponding application software.
  • An infrared touch screen comprising an infrared emitting element disposed on an infrared emission scanning circuit board and an infrared receiving element disposed on the infrared receiving scanning circuit board, wherein the infrared emitting element on the infrared emitting scanning circuit is in at least one detecting direction
  • the emitted light can be received by the infrared receiving element on the infrared receiving scanning circuit at a position perpendicular to its vertical position, and can be received by at least one infrared receiving element on the scanning circuit which is obliquely opposed to the vertically opposite position, that is, obliquely opposite. Received at different times.
  • the infrared elements are vertically opposite and obliquely opposed, but merely indicate the corresponding relationship of the infrared elements in the actual mounting position, and do not require precise adjustment of the position of the infrared elements such that their optical axes maintain the above corresponding relationship.
  • the infrared emitting elements Due to the mounting position, at the corners of the transmitting scanning circuit, some of the infrared emitting elements have no infrared receiving elements inclined to oppose them, and the light emitted by the infrared emitting elements can only be received by a vertically opposite receiving element; likewise, receiving At the corners of the scanning circuit, a part of the infrared receiving elements are not inclined with respect to the infrared emitting elements, and the infrared receiving elements only receive light from a vertically opposite transmitting element.
  • the infrared emitting element There are two ways for the corresponding relationship between the infrared emitting element and the infrared receiving element.
  • One is that the infrared receiving element that is vertically opposite to the part of the infrared emitting element and the oppositely facing infrared receiving element are on the same infrared receiving scanning circuit board.
  • the remaining infrared emitting elements are vertically opposite the infrared receiving elements and the obliquely opposite infrared receiving elements are on different infrared receiving scanning circuit boards; the other way is that the infrared receiving elements and the tilting are directly opposite to the same infrared emitting element.
  • the infrared receiving components are respectively located on different infrared receiving scanning circuit boards.
  • the infrared emitting scanning circuit board When a portion of the infrared emitting element vertically facing the infrared receiving element and the tilting opposite infrared receiving element are on the same infrared receiving scanning circuit board, the infrared emitting scanning circuit board operates at the same timing, and one detecting scanning period is at least two. stage. In the first half or the second half of the scanning period, the light emitted by one of the infrared emitting elements is received and detected by an infrared receiving element that is perpendicularly opposite thereto, and the infrared emitting elements are turned on one by one, and the infrared receiving elements that are perpendicular to each other are aligned one by one. Receive detection.
  • This process is similar to the ordinary infrared touch screen detection method, which is called vertical scan detection; the scanning continues to another half cycle, when the infrared emitting element is lit again, the light emitted by the infrared emitting element is received by another infrared light obliquely opposite thereto.
  • the component receives the detection, and the infrared emitting elements are turned on one by one, and the infrared receiving elements that are opposite to each other are received and detected one by one.
  • this process is referred to herein as tilt scan detection.
  • the light from one of the infrared emitting elements can be received by the infrared receiving elements at two different locations at different times.
  • the infrared receiving scanning circuit board can also be operated with the same timing, and one detection scanning period is also divided into at least two stages.
  • an infrared receiving component receives the light emitted from an infrared emitting element that is vertically aligned, and the infrared receiving elements are turned on one by one, and the infrared emitting elements vertically opposite thereto are point by point. bright.
  • This is called vertical scan detection; continue scanning to another half cycle, when the infrared receiving element is turned on again, the light it receives is detected from another infrared emitting element that is obliquely opposite thereto, and the infrared receiving element is turned on one by one.
  • the infrared emitting elements that are inclined with respect to them are illuminated one by one. This process is called tilt scan detection.
  • an infrared receiving element can receive light from two different positions of the infrared emitting elements at different times.
  • the infrared ray receiving element and the slanting opposite infrared absorbing element of the part of the infrared ray emitting element are on the same infrared receiving scanning circuit board, and the remaining infrared emitting elements are vertically opposite to the infrared receiving element and the tilting is opposite.
  • the infrared receiving components are on different infrared receiving scanning circuit boards, and the infrared transmitting circuit board or the infrared receiving circuit board can be operated with the same timing.
  • the infrared receiving element and the obliquely opposite infrared receiving element that are vertically opposite to the same infrared emitting element can be respectively located on different infrared receiving scanning circuit boards.
  • each infrared emission The board or receiver board may have different timings.
  • the infrared emission scanning circuit board uses the same timing as the example for the vertical scanning and the oblique scanning. One detection scanning period is divided into at least two stages. To reduce interference, each infrared emission scanning circuit board, especially the adjacent infrared emission scanning circuit The board adopts different timings.
  • each infrared receiving scanning circuit board uses the same timing operation as the vertical facing infrared emission scanning circuit board to realize vertical scanning detection; in the oblique scanning stage, each infrared transmitting circuit board adopts and vertically The same timing operation in the scanning phase, and the timing of each receiving circuit board is changed to become opposite to its adjacent tilt
  • the timing of the infrared emission board enables tilt scan detection. This timing change is easier to implement under the CPU control of the touch system.
  • the scan program can be pre-defined for no processing during tilt scan detection.
  • the touch screen of the present invention can be implemented for the infrared receiving circuit board using the same timing for vertical scanning and tilt scanning, and the timing of the infrared transmitting circuit board is changed at different scanning stages. Similar to the previous article, a detection scan period is divided into at least two stages.
  • the infrared reception scanning circuit board uses the same timing in both vertical scanning and oblique scanning, and each infrared receiving scanning circuit board, especially the adjacent infrared receiving scanning circuit board, is different.
  • each infrared emission scanning circuit board uses the same timing operation as the vertical positive infrared receiving scanning circuit board to realize vertical scanning detection; in the oblique scanning phase, each infrared receiving circuit board adopts the same vertical scanning stage
  • the timing operation, and the timing of each of the transmitting circuits is changed to become the timing of the infrared receiving circuit board opposite to its adjacent tilt, thereby implementing tilt scanning detection.
  • This timing change is easier to implement under the CPU control of the touch system.
  • the scan program can be pre-defined for no processing during tilt scan detection.
  • the subsequent multi-point positioning method can be realized without increasing the circuit cost.
  • the infrared emitting elements on the infrared emission scanning circuit and the infrared receiving elements on the infrared receiving scanning circuit in the same detection direction are all deflected by the same angle in the same direction such that the infrared emitting elements are opposed to the infrared receiving elements. Due to the mounting position, at the corners of the transmitting scanning circuit, a part of the infrared emitting elements have no infrared receiving elements obliquely opposite to them; likewise, at the corners of the receiving scanning circuit, a part of the infrared receiving elements have no infrared emitting elements and are inclined with respect to them. These infrared emitting/receiving elements may not deflect the angle.
  • the deflection angle can be calculated and determined according to the selected parameters of the infrared emitting element and the infrared receiving element, combined with the size of the touch detection area; or can be determined by experimental tests according to actual effects. Under the premise of satisfying the receiving energy of the infrared receiving component, the deflection angle of the infrared component should be as large as possible, so that the position of each touch point can be better distinguished, and the calculation precision of the coordinates of multiple touch points can be improved.
  • the effect of the present invention can also be achieved by selecting a component having a larger emission angle than that of a conventional red component. This component can be used without deflecting the infrared emitting component and the infrared receiving component by a certain angle.
  • the infrared receiving element and the obliquely opposite infrared receiving elements vertically opposite to the same infrared emitting element are respectively located on different infrared receiving scanning circuit boards, and may also be on the same infrared receiving scanning circuit board. It depends on the magnitude of the deflection angle of the infrared emitting element and the infrared receiving element.
  • the infrared emitting elements and the infrared receiving elements in the horizontal array are different in frequency from the infrared emitting elements and the infrared receiving elements in the longitudinal array to avoid interference between the infrared emitting infrared receiving elements.
  • the infrared emitting elements and the infrared receiving elements in the horizontal array are different in frequency from the infrared emitting elements and the infrared receiving elements in the longitudinal array to avoid interference between the infrared emitting infrared receiving elements.
  • using a 940 nm infrared emission receiving element in a lateral array and a vertical array 850nm infrared emission receiving component so that in the detection area of the corner, adjacent infrared transmitting and receiving components do not interfere with each other.
  • X adjacent infrared scanning unit has different frequency infrared Tube infrared touch device.
  • the multi-touch positioning method of the present invention mainly comprises the following steps: a) starting the scan generator, first normalizing and/or initializing the infrared receiving component vertically opposite the infrared emitting component, and then returning Integrating and/or initializing the tilted opposite infrared receiving elements, respectively recording the tilt normalized value and/or the tilt initializing value of each of the infrared receiving elements; or first normalizing and/or initializing the tilted opposing infrared receiving elements
  • Initializing and/or initializing vertically facing elements respectively recording skew normalized values and/or initialization values and vertical normalization values and/or initialization values;
  • step c according to the change of the output value of each infrared receiving component and the tilt normalized value and/or the initial value, obtain each position parameter, determine the relationship between the actual coordinates X and Y of the touch point, and step c
  • the calculated possible touch point values are substituted into the formula determined by each position parameter to determine the position coordinates of each touch point, and the coordinate data is sent to the computer for processing;
  • step f ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( ): ( f), according to the method from step b to step e, start a new cycle.
  • Another main method for realizing the multi-touch positioning method of the present invention is that the oblique scanning is performed first, and then the vertical scanning is performed, and the others are the same as described above.
  • the origin of the coordinate axis is at the upper right (the selection of the actual origin can be freely selected, and can be selected at the lower left, upper left or any other position, and then the simple change of the proof formula can be performed), and the X-axis direction scan is from right to left.
  • Y-axis direction scan from top to bottom
  • X Y represents the touch point coordinate value to be determined
  • L represents the total length of the touch area in the X-axis direction
  • 1 is the X-direction infrared receiving element output value changes and the reception
  • the distance from the infrared ray element of the component opposite to the origin is the positional parameter in the X-axis direction
  • h is the time when the output value of the infrared receiving component in the Y direction changes.
  • the distance from the infrared ray element of the slanting element to the origin is the positional parameter in the Y-axis direction
  • ⁇ indicates the infrared ray element in the X-axis direction and the illuminating infrared receiving element line and the infrared ray element and the vertical directional infrared receiving
  • the angle between the component wires, ⁇ represents the angle between the infrared emitting element in the Y-axis direction and the line connecting the obliquely opposite infrared receiving element and the line connecting the infrared emitting element and the vertical facing infrared receiving element.
  • these infrared emitting elements or infrared receiving elements can be pre-defined and not processed by the scanning program when performing tilt scan detection.
  • multi-touch positioning can be achieved with only one direction of detection.
  • the two directions can be used to comprehensively judge the data. For example, when the touch point is close to the corner area or when a plurality of touch points are close to overlap in a small area, it is necessary to perform comprehensive judgment in combination with the detection data of the two directions.
  • the multi-touch positioning method of the present invention divides the scanning detection into two processes of vertical scanning detection and oblique scanning detection.
  • the oblique scanning does not have to be performed all the time.
  • Only vertical scanning detection is performed, so that multiple touch points can be identified by judging the movement tendency of each touch point.
  • the step of oblique scanning can be omitted, and the refresh rate of the touch detection can be maintained at a high level by such a method.
  • one scanning period can be divided into three or more stages, and several scanning detections are performed, so that One transmitting element can correspond to three or more receiving elements, and accordingly, the detection system can obtain more positional parameters, and more proofing formulas are used to determine the actual position coordinates of the plurality of touched points.
  • the infrared touch screen system can distinguish multiple touch points that are simultaneously touched, so that multi-touch positioning can be realized on the infrared touch screen.
  • the moving tendency of each touch point can be determined, according to which different touch operation functions can be defined, for example, the opposite directions of the two touch points indicate that the zooming or zooming operation is performed; The touch point does not move, and the other touch point performs an arc motion, indicating that the rotation operation is performed, etc., and the functions that the single touch system cannot perform are completed, and all of these functions can be flexibly defined by the corresponding application software.
  • An infrared touch screen in which at least one of the infrared emitting elements and the infrared receiving elements are in contact
  • the direction of the center of the touch screen is deflected such that the infrared emitting elements on the infrared emitting scanning circuit face the infrared receiving elements on the infrared receiving scanning circuit, forming an intersecting correspondence relationship.
  • one infrared emitting element A vertically corresponds to one infrared receiving element A', and the tilt corresponds to one receiving element ⁇ '; and the infrared emitting element corresponding to the receiving element B' vertically corresponds to the corresponding B', and correspondingly The receiving element ⁇ ', such that the transmitting elements ⁇ , ⁇ , and the receiving elements A ', B ' form an intersecting correspondence.
  • the vertical correspondence of the infrared elements described above corresponds to the tilt, and only indicates the corresponding relationship of the infrared elements in the actual mounting position. It is not required to precisely adjust the position of the infrared elements so that their optical axes maintain the above corresponding relationship.
  • the deflection angle can be calculated and determined according to the selected parameters of the infrared emitting element and the infrared receiving element, combined with the size of the touch detection area; or can be determined by experimental tests according to actual effects. Under the premise of satisfying the receiving energy of the infrared receiving component, the deflection angle of the infrared component should be as large as possible, so that the position of each touch point can be better distinguished, and the calculation precision of the coordinates of the plurality of touch points can be improved.
  • the infrared touch screen adopting the above correspondence relationship may be arranged on the receiving circuit board or on the transmitting circuit board. Accordingly, there may be one or two transmitting circuit boards in a certain direction.
  • the microprocessor and the prior art main microprocessor are arranged on the receiving circuit board, and the main microprocessor is more flexible to meet the needs of different structural forms of the touch screen. After the main microprocessor is arranged on the transmitting circuit board, the receiving board can have only one microprocessor.
  • the infrared emitting element and the infrared receiving element form a cross-corresponding relationship, and relative to the corresponding mode of the second technical solution, all the infrared emitting elements can be turned on and off twice, and all the receiving elements are also Corresponding reception twice, achieving a true tilt scan coverage of 100%, there will be no case where the infrared elements in the corners of the second scheme cannot be covered during the oblique scanning process and special processing must be performed.
  • the scanning detection method and the process and the multi-point positioning method are similar to the technical solution 2, and will not be repeatedly described herein.
  • multi-touch positioning can be achieved with only one direction of detection.
  • the two directions can be used to comprehensively judge the data.
  • the multi-touch positioning method of the present invention divides the scanning detection into two processes of vertical scanning detection and oblique scanning detection. In fact, the oblique scanning does not have to be performed all the time. When the position coordinates of the respective touch points have been determined and remain stable, Only the vertical scan detection is performed, so that a plurality of touch points can be identified by judging the movement tendency of each touch point.
  • a method for identifying a plurality of touch points by detecting a trend of a touch point motion comparing a change in the number of position coordinates detected in the current period with the previous calculation period and/or a change in the coordinate value, and registering a new touch point when a new touch point is added Information, if there is a touch point to leave, cancel the left touch point information; compare the change of the coordinate value (x, y) detected in this cycle with the previous calculation cycle, and the coordinate value (x, y) and the registered Compare the current position coordinates of the touch point, Judging the movement trend of the touch point; calculating and judging the touch point where the position changes, and assigning the latest coordinate value to the touch point.
  • the step of oblique scanning can be omitted, and the refresh rate of the touch detection can be maintained at a high level by such a method.
  • the present invention has the following beneficial effects:
  • Multi-touch positioning can be achieved without increasing hardware costs.
  • the application is more extensive. It can realize single touch and multi-touch, and complete the existing touch screen; the multi-person simultaneous operation function that is difficult to implement can be applied to more fields and occasions.
  • the algorithm for realizing multi-point positioning is simple, and the coordinates of the touch point position are convenient, accurate and reliable.
  • the circuit board type is small, the shape is regular, and it is easy to realize mass production.
  • FIG. 1 is a schematic structural diagram of a circuit according to an embodiment of the first technical solution of the present invention
  • FIG. 4 is a schematic diagram of two point touch positioning according to an embodiment of the first technical solution of the present invention.
  • FIG. 5 is a schematic diagram of a touch point pre-detection calculation according to an embodiment of the first technical solution of the present invention
  • FIG. 6 is a schematic diagram of non-positive correspondence calculation of an infrared component according to an embodiment of the first technical solution of the present invention.
  • FIG. 7 is a schematic diagram of detecting touch points in two directions according to an embodiment of the first technical solution of the present invention.
  • FIG. 8 is a schematic flow chart of a multi-touch positioning method according to an embodiment of the first technical solution of the present invention.
  • FIG. 9 is a schematic structural diagram of another circuit of an embodiment of the first technical solution of the present invention.
  • FIG. 10 is a schematic structural diagram of another circuit according to an embodiment of the first technical solution of the present invention.
  • FIG. 11 is a schematic structural diagram of a circuit of an embodiment of the second technical solution of the present invention.
  • FIG. 12 is a schematic diagram of a circuit scanning operation of an embodiment of the second technical solution of the present invention.
  • FIG. 13 is a schematic diagram of two point touch positioning according to an embodiment of the second technical solution of the present invention.
  • FIG. 14 is a schematic flow chart of a multi-touch positioning method according to an embodiment of the second technical solution of the present invention.
  • Figure 15 is a schematic view showing an embodiment of an infrared touch panel according to a third aspect of the present invention.
  • FIG. 1 is a block diagram showing the structure of a circuit according to an embodiment of the present invention.
  • 101, 103 are infrared emitting elements mounted at different positions on the transmitting circuit board 111
  • 102, 104 are infrared emitting elements mounted on the transmitting circuit board 112, wherein the mounting position of 101 on 111 and 102 are at 112
  • the mounting position is the same
  • the mounting position of 103 on 111 is the same as the mounting position of 104 on 112.
  • 115, 116, 117, 118 are receiving boards.
  • the receiving boards 115 and 116 correspond to the transmitting board 111 in correspondence with the mounting positions
  • 117 and 118 correspond to 112.
  • the infrared emitting element 101 corresponds to the infrared receiving element 105 facing the infrared receiving element 105, and also corresponds to the infrared receiving element 106, 101 and 106.
  • the angle is at an angle with the central axis of the component. This correspondence can be achieved by selecting a component whose emission angle is larger than that of the ordinary infrared component, or by a method of deflecting the component by a certain angle during the installation process. The size of the angle can be determined according to actual needs.
  • the infrared emitting element 102 corresponds to the infrared receiving elements 107 and 108 at the same time
  • 103 corresponds to 106 and 107 at the same time
  • the corresponding direction of the emission in the other direction is the same as that of the infrared receiving element, and is not repeated here.
  • the correspondence between the transmitting boards 111, 112 and the receiving boards 115, 116, 117, 118 has been different from the one-to-one correspondence of the conventional infrared touch screen circuits.
  • the circuit with the infrared emitting elements is equipped.
  • the board and the board with the IR receiving components must operate at their respective timings. 2 is a timing diagram of the present example.
  • the infrared emitting elements on the transmitting circuit boards 111 and 112 operate according to the timings shown in 201 and 202, respectively, and the corresponding receiving circuit boards 116, 118 operate according to the timings shown in 206 and 208, respectively. According to the corresponding relationship shown in FIG.
  • the receiving board 116 only corresponds to the transmitting board 111
  • the receiving board 118 only corresponds to the transmitting board 112. Therefore, the timings of 201 and 206 in FIG. 2 are the same, and the timings of 202 and 208 are also the same.
  • the timing of the operation changes with the corresponding situation of the transmitting board, as shown in Figs. 205 and 207.
  • FIG. 3 is another timing diagram of the present example.
  • the detection system starts scanning from the infrared emitting element 101, 101 operates according to the timing shown by 301, and at the same time, the infrared receiving elements 105, 106 corresponding to 101 are also in accordance with 301.
  • the timing of the work At this time, the infrared emitting element 102 and the infrared receiving elements 107, 108 operate in accordance with the timing shown at 302.
  • the detection system continues to scan to the infrared emitting elements 103 and 104, the timing of certain boards needs to be properly adjusted, as shown at 303, the operating timing of the infrared emitting elements 103 and corresponding infrared receiving elements 106, 107 has changed.
  • . 304 denotes the timing of the infrared emitting element 104 and the corresponding infrared receiving element 108.
  • the correspondence between the timings of the infrared emitting element and the infrared receiving element shown in FIG. 2 and FIG. 3 is only two of a plurality of corresponding relationships, and the actual correspondence relationship is not limited to the two listed, but may be based on Need to adjust.
  • the touch screen system can determine whether there is another touch point in a certain area nearby and mark it well in determining the occurrence of a touch event, and combine the further detection data.
  • the position coordinates of a plurality of touch points can be calculated.
  • touch points 410 and 411 operate simultaneously on the touch screen
  • 401 represents a transmitting board
  • 404 represents a receiving board.
  • the scan generator starts to work, and the normalization of each infrared receiving element is completed.
  • the output value of the infrared receiving element 405 facing it does not change, and the detecting system considers that no touch event occurs at the place;
  • the system determines that a touch event occurs in the angled region, and activates the touch point pre-detection algorithm to mark the area for further judgment.
  • the output of the infrared receiving element 406 corresponding thereto changes, thereby determining that a touch event occurs at the place, and in combination with the judgment of the previous pre-detection algorithm, the location is within the marked area. It is determined that there is a touch point 411 at this point, and the position coordinates of the touch point can be calculated.
  • the coordinate position of the touch point 410 can be determined.
  • FIG. 5 is a schematic diagram of a touch point pre-detection calculation according to an embodiment of the present invention. As shown in the figure, when the infrared emitting element 501 is scanned, the output value of the infrared receiving element 505 corresponding to a certain angle of 501 is detected to change, and the touch point pre-detection algorithm determines that the angle has a touch event, using the formula.
  • the possible location of the touch event can be calculated.
  • X represents the distance between the infrared receiving element 503 facing the transmitting tube and the infrared receiving element 505 corresponding to the infrared emitting element
  • ⁇ represents the angle between the infrared emitting element and the non-pairing infrared receiving element. 508.
  • the true position of the touch event in the marked area is obtained between the infrared emitting element 502 and the infrared receiving element 504, and the coordinate values of the possible touch points 506 are calculated using the above formula.
  • the position coordinates of the touch point 507 can be obtained using the same method.
  • the corresponding relationship between the infrared emitting element and an infrared receiving element is a positive correspondence relationship, and the other infrared receiving element has a non-positive correspondence relationship, and the previous calculation formula can be used.
  • the relationship between the infrared emitting element and the infrared receiving element can be completely non-positive, as shown in Fig. 6.
  • the above formula needs to be appropriately modified.
  • 601, 601 are infrared emitting elements
  • 603, 604 are infrared receiving elements corresponding to 601, 605, 606 are receiving elements corresponding to 602, and 607 is a touch point.
  • 608 denotes the angle between 601 and 604, denoted by ⁇
  • 609 denotes the angle between the line 601 and 603 and the line connecting 601 and 604, denoted by ⁇ , in this case, the possible position of the touch point 607 It can be expressed by the following formula:
  • Equation (1) represents the distance between 603 and 604.
  • Equation (2) represents the distance between 603 and 604.
  • Equation (1) can be regarded as a simpler example of formula (2).
  • ⁇ + ⁇ 90°
  • the formula ( 1 ) is exactly the same as the formula (2 ).
  • the position of each touch point can be correctly found.
  • various operation functions can be defined according to the movement trend of each point, and the user operation intention is recognized. For example, at a certain In the occasion, the two touch points move in the opposite direction, indicating that the zoom operation is performed; one touch point does not move, and the other touch point performs an arc motion, indicating that the rotation operation is performed, and the like. These operational functions can be flexibly defined by the corresponding application software.
  • the possible position of the touch point calculated by the pre-detection algorithm is 701, 702, 703, 704, and the actual position of the touch cannot be accurately determined, and there is a possibility of misjudgment.
  • the pre-detection algorithm cannot be enabled, it is also necessary to use two direction detection data to calculate the position coordinates of the touch point.
  • FIG. 9 is a schematic diagram of another circuit structure of an embodiment of the present invention.
  • 921, 922 are respectively a transmitting circuit board mounted with an infrared emitting element and a receiving circuit board equipped with an infrared receiving element
  • 911, 912 are 8, 16, or other numbers of infrared emitting elements on the transmitting circuit board 921.
  • the two emission scanning units, 913, 914, 915, 916, are received scanning units on the receiving circuit board 922, and 901, 902, 903, 904, 905, 906 are infrared elements on the respective scanning units.
  • FIG. 10 is a schematic diagram of still another circuit structure of an embodiment of the present invention.
  • 1021, 1022 respectively represent an infrared transmitting circuit board and an infrared receiving circuit board
  • 1011, 1012, 1013, 1014 represent logically divided scanning units including a certain number of infrared elements on each circuit board
  • 1001 represents Infrared emitting elements
  • 1002, 1003, represent infrared receiving elements.
  • the 1011 emission scanning unit starts from 1001 and turns on and illuminates the respective transmitting elements one by one.
  • the 1013 receiving scanning unit starts to receive the respective receiving elements one by one from the beginning of 1002, and at the same time, corresponding to 1011, the receiving scanning unit starts from 1003 one by one.
  • Each receiving element is turned on for reception.
  • the timing chart of the operation of each scanning unit is similar to that of FIG. 2 and FIG. 3, and only a small number of changes are needed according to the actual situation, and will not be discussed here. Specific implementation of technical solution 2
  • Figure 11 is a block diagram showing the structure of a circuit according to an embodiment of the present invention.
  • 1121, 1122, 1123, 1124 are transmitting circuit boards on which infrared emitting elements are mounted, and 1101, 1102, 1103, 1104, 1105, 1106, 1107 are infrared emitting elements mounted on the above circuit board.
  • 1108, 1109, 1110, 1111, 1112, 1113, 1114 are infrared receiving elements mounted on receiving circuit boards 1125, 1126, 1127, 1128.
  • the correspondence between the infrared emitting element and the infrared receiving element is different from that of the ordinary infrared touch screen, and the infrared emitting element 1101 is in addition to In addition to the infrared receiving element 1108 which is perpendicular to the vertical direction, it also corresponds to the infrared receiving element 1109.
  • the correspondence between 1101 and 1109 is referred to as tilting, and the same 1102 is opposite to 1110 except that it is vertically opposite to 1109; 1103 is perpendicular to 1110, opposite to 1111, 1104 and 1111 are perpendicular to each other, opposite to 1112, 1105 and 1112 are perpendicular to each other, and 1113 Tilting opposite, 1106 and 1113 are vertically opposite, opposite to 1114. Due to the corners, 1107 and the infrared emitting elements behind it are only perpendicular to one receiving element, and no receiving elements are obliquely opposed to them.
  • some of the infrared receiving elements prior to 1109 include 1108, and no infrared emitting elements are obliquely opposed to them.
  • the transmission in the other direction is the same as the correspondence between the infrared receiving elements and will not be repeated here.
  • This correspondence can be achieved by a method of deflecting the component by a certain angle during the installation process, for infrared components mounted on the corners such as the 1107 and the infrared emitting components behind it and some of the infrared receiving components before 1109 because there is no infrared
  • the elements are inclined relative to them and can be angled without deflection.
  • the magnitude of the deflection angle of the infrared component can be calculated and determined according to the parameters of the selected infrared emitting component and the infrared receiving component combined with the size of the touch detection area; it can also be determined experimentally according to the actual effect.
  • the emission angle of an infrared emitting element is nominally 35 degrees. In fact, its emission energy is concentrated in the range of 0-18 degrees.
  • the deflection angle of the transmitting element and the receiving element can be selected to be about 8 degrees.
  • the actual deflection effect can also be selected by the actual effect of the experimental test.
  • the angle can be achieved without using a deflection angle, by selecting an element having a larger emission angle than that of an ordinary infrared element, since the infrared element used in the infrared touch screen usually has a small emission angle, thus making the infrared energy It is better to focus on the opposite receiving components, and to achieve the above-mentioned correspondence, it is necessary to use an infrared component with a large emission angle.
  • a deflection angle by selecting an element having a larger emission angle than that of an ordinary infrared element, since the infrared element used in the infrared touch screen usually has a small emission angle, thus making the infrared energy It is better to focus on the opposite receiving components, and to achieve the above-mentioned correspondence, it is necessary to use an infrared component with a large emission angle.
  • Chinese patent No. 200710028616 refer to the Chinese patent No. 200710028616.
  • the scanning detection method of the ordinary infrared screen is referred to as vertical scanning detection.
  • the above circuit configuration is adopted, and each scanning detection period is used.
  • the scan detection process is divided into two phases. Taking FIG. 11 as an example, in the first half of the scanning period, the transmitting board starts to light up from 1101, at this time, 1108 is turned on, the value is output, and then the infrared element after 1101 is turned on, and the receiving element facing it is turned on at the same time. ..., each of the infrared emitting elements 110 1103, 1104, 1105, 1106, 1107, etc.
  • the scan is sequentially illuminated, and the receiving elements 1109, 1110, 1111, 1112, 1113, 1114 are sequentially turned on to output values.
  • the scan is performed for half a cycle, and the vertical scan detection is completed.
  • the infrared emitting elements illuminate in the same manner as the first half of the cycle, and the order in which the receiving elements are turned on is in a different order.
  • This part of the infrared elements can be pre-defined by the scanning program during tilt scan detection. Do the processing.
  • Figure 12 shows the process of circuit scanning.
  • the scan detection is divided into two stages, a vertical scan phase and a tilt scan phase, assuming that there are n infrared emitting elements or infrared receiving elements on each circuit board, assuming a tilted opposite reception of the first transmitting element.
  • the element is the mth receiving element
  • the receiving element obliquely opposite to the second emitting element is the m+1th receiving element, ..., arranged in this way, the receiving element obliquely opposite to the ⁇ -m+l emitting element Is the nth receiving component.
  • both the transmitting component and the receiving component are turned on one by one from the first to the nth; when performing the oblique scanning, the transmitting component starts from the first, and the transmitting component is from the first to the n-m. +1 turn-on and turn-on, and the receiving elements that are opposite to each other are turned on one by one from the mth to the ⁇ th, and continue scanning, and the n-th+2th to nthth emitting elements are turned on one by one.
  • the receiving element is turned on, the sequence is turned back to the front, and the detection is performed one by one from m1 to m-1. At this time, the first to m-1th receiving elements receive the output from another transmitting circuit board.
  • the infrared transmitting circuit board or the infrared receiving circuit board operates at the same timing.
  • each of the infrared emitting circuit boards or the receiving circuit board may Use different timings.
  • adjacent infrared emission scanning circuit boards use different timings.
  • each receiving circuit board uses the same timing operation as the vertical positive infrared emission scanning circuit board to realize vertical scanning detection;
  • each The infrared transmitting circuit board operates at the same timing as the vertical scanning phase, and the timing of each receiving circuit board is changed to become the timing of the infrared transmitting circuit board which is inclined with respect to it, thereby implementing tilt scanning detection.
  • This timing change is easier to implement under the CPU control of the touch system.
  • the scanning program can be pre-defined for no processing during tilt scan detection.
  • the touch screen system can determine the possible position coordinates of the touch point by performing a vertical scan detection first, and then determine the coordinate relationship of each touch point position by one tilt scan detection. Then, the possible position coordinate values of the touch points obtained by the vertical scan detection are substituted into the coordinate relationship formula determined by the tilt scan detection, and the position coordinates of the respective touch points are determined.
  • a method of realizing multi-touch positioning will be described below with reference to FIG.
  • the total length of the touch area in the X-axis direction is L, and the transmitting element and the receiving element are in the X-axis direction.
  • the deflection angles of the pieces are opposite, and the angles of the deflection elements of the x-axis direction and the direction of the deflection of the receiving elements are opposite.
  • the scanning in the X-axis direction is performed from the right to the left, and the scanning in the ⁇ -axis direction is performed from the top to the bottom.
  • the coordinate origins required for the calculation are selected in the upper right X-direction scanning and the x-direction scanning start.
  • the touch points 1301 and 1302 are simultaneously operated on the touch screen, and their coordinates on the touch screen at a certain time are (Xa, Ya), (Xb, Yb), respectively.
  • the touch device shown in FIG. 13 needs to complete the normalization or initialization of each infrared receiving component before starting the touch detection.
  • the normalization or initialization steps are divided into two. Step, first normalize or initialize the vertically facing infrared receiving component, and then normalize or initialize the receiving component opposite to the tilting of the transmitting component according to the corresponding relationship of the oblique scanning, and save the two normalized values or initial values respectively. For vertical normalization or initialization values, tilt the normalized value or initialized value.
  • each of the infrared emitting elements and the infrared receiving elements perpendicular thereto are sequentially turned on, and the output values and vertical normalization values of the respective infrared elements are detected. Whether the initialization value is changed or not.
  • the output values of the infrared receiving elements 1307, 1309 which are perpendicular to them are changed, and the detecting system considers that two touch events occur, and records their X-axis coordinates.
  • the values X, X are also similar.
  • the system can obtain four sets of possible touch point coordinate values of touch points 1301, 1302, ⁇ , ), , ⁇ 2 ) , , ⁇ , ) , 2 , ⁇ 2 ) .
  • the scanning of the lower half cycle is continued, and the receiving component that is turned on is tilted relative to the receiving component of the infrared emitting component, and whether the output value of each infrared receiving component is compared with the tilt normalized value or the initial value is detected.
  • the output value of the receiving element 1308 opposite thereto is changed, thereby determining that a touch event occurs on the line connecting 1303 and 1308, and recording the distance 113 from the origin of the coordinate
  • the same method can be used to determine that another touch event occurs on the line between 1305 and 1310, and note the distance 12 from the origin of the 1305 to the coordinate origin.
  • the scanning detection is divided into two processes: vertical scanning detection and oblique scanning detection.
  • the oblique scanning does not have to be performed all the time.
  • the vertical scanning detection is performed.
  • a plurality of touch points can be identified.
  • the step of tilt scanning can be omitted, which can keep the refresh rate of touch detection at a high level.
  • the position of each touch point can be correctly found.
  • various operation functions can be defined according to the movement trend of each point, and the user operation intention is recognized. For example, in an application, two touch points move in the opposite direction, indicating that the zoom operation is performed; one touch point does not move, and the other touch point performs an arc motion, indicating that the rotation operation is performed, and the like. These operational functions can be flexibly defined by the corresponding application software.
  • infrared components of different frequencies are installed in the infrared emission receiving arrays of different detection directions, infrared components of 940TM are used in the horizontal detection direction, and infrared components of 850 nm are used in the vertical direction, so that in the detection area of the corners, There is no possibility that adjacent infrared elements interfere with each other.
  • Figure 15 is a schematic view showing a first embodiment of the present invention, showing that the infrared emitting element and the infrared receiving element form an intersection relationship in the vertical detecting direction.
  • 1501, 1501, 1503, 1504 are infrared emitting elements mounted on a transmitting circuit board
  • 1505, 1506, 1507, and 1508 are infrared receiving elements mounted on a receiving circuit board.
  • the infrared emitting element and the infrared receiving element are vertically opposite, and in the detecting direction where 1503, 1508 is located, the infrared emitting elements 1503, 1504 are directed to the touch screen.
  • the center is deflected by a certain angle, and the direction of the 1503 deflection angle is opposite to that of 1504. Accordingly, the infrared receiving elements 1507, 1508 are also deflected toward the center of the screen by a certain angle.
  • 1503 is opposite to 1507
  • 1504 is perpendicular to 1507
  • 1508, 1503, 1504, 1507, 1508 form the cross-corresponding relationship shown in the figure.
  • This correspondence can be achieved by a method of deflecting the component by a certain angle during the installation process.
  • the magnitude of the deflection angle of the infrared component can be calculated according to the selected parameters of the infrared emitting component and the infrared receiving component combined with the size of the touch detection area.
  • the emission angle of an infrared emitting element is nominally 35 degrees, and its emission energy is actually concentrated in the range of 0-18 degrees. If used on a 40" touch screen, due to the working distance between the transmitting element and the receiving element. Farther, in order to ensure better results, the deflection angle of the transmitting component and the receiving component can be selected to be about 12 degrees. Of course, it can also be tested experimentally. The actual effect is to choose the appropriate deflection angle.
  • the infrared touch screen using the circuit structure shown in FIG. 15 may be arranged on the receiving circuit board or on the transmitting circuit board, and accordingly, the transmitting circuit board in a certain direction may be There are one to two microprocessors, and the main microprocessor is arranged on the receiving circuit board in comparison with the prior art main microprocessor, and the main microprocessor is more flexible to meet the needs of different structural forms of the touch screen. After the main microprocessor is arranged on the transmitting circuit board, the receiving board can have only one microprocessor.
  • the infrared emitting element and the infrared receiving element form a cross-corresponding relationship in the horizontal detecting direction.
  • the above two specific implementation manners can meet the multi-touch requirement in many occasions, and for the more touch points and the higher multi-touch requirements, it is necessary to adopt the third embodiment of the present invention, that is, in the vertical
  • the infrared emitting element forms an intersecting relationship with the infrared receiving element.
  • the tilt scan can be performed in both detection directions of the touch screen, and the cover rate of the tilt scan can reach 100%.
  • the touch screen system can determine the possible position coordinates of the touch point by performing a vertical scan detection first, and then determine the relationship of the touch point coordinates in both detection directions by one tilt scan detection, thereby Accurately identify each touch point.
  • the circuit structure can be more flexible.
  • the timing of the operation of the infrared emitting element and the infrared receiving element can also be adjusted according to the actual situation. If necessary, one scanning period can be divided into three or more stages, and several scanning detections are performed. Therefore, the scope of the present invention is not limited thereto, and any insubstantial changes based on the technical solutions of the present invention are included in the scope of the present invention.

Abstract

L'invention concerne un écran tactile infrarouge et un procédé de positionnement tactile multipoint. Plus précisément, dans au moins une direction de détection de l'écran tactile, un faisceau émis par un composant d'émission infrarouge est reçu et détecté par un composant de réception infrarouge, et est également reçu et détecté par un autre composant de réception infrarouge.
PCT/CN2008/000847 2007-06-15 2008-04-25 Ecran tactile infrarouge et procédé de positionnement tactile multipoint WO2008154792A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN200710028616.X 2007-06-15
CNB200710028616XA CN100527066C (zh) 2007-06-15 2007-06-15 一种红外线触摸屏及其多点触摸定位方法
CNA2007100310826A CN101149656A (zh) 2007-10-26 2007-10-26 一种红外线触摸屏及多点触摸定位方法
CN200710031082.6 2007-10-26
CN200810025705.3 2008-01-09
CN2008100257053A CN101226446B (zh) 2008-01-09 2008-01-09 红外线触摸屏及多点触摸定位方法

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CN102270063A (zh) * 2010-06-03 2011-12-07 上海优熠电子科技有限公司 红外真多点触摸屏
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CN103984443A (zh) * 2013-02-07 2014-08-13 深圳市艾博德科技有限公司 红外线触摸屏及触摸点定位方法
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US8803848B2 (en) 2007-12-17 2014-08-12 Victor Manuel SUAREZ ROVERE Method and apparatus for tomographic touch imaging and interactive system using same
US9836149B2 (en) 2007-12-17 2017-12-05 Victor Manuel SUAREZ ROVERE Method and apparatus for tomographic tough imaging and interactive system using same
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WO2011116538A1 (fr) * 2010-03-26 2011-09-29 Chen Weishan Procédé d'identification pour l'identification simultanée de multiples points de toucher sur un écran tactile
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CN103984443A (zh) * 2013-02-07 2014-08-13 深圳市艾博德科技有限公司 红外线触摸屏及触摸点定位方法
CN106020566A (zh) * 2016-05-05 2016-10-12 广州华欣电子科技有限公司 一种红外触摸屏的扫描方法及装置

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