CN107831953B - Infrared touch screen scanning method and device and infrared touch equipment - Google Patents
Infrared touch screen scanning method and device and infrared touch equipment Download PDFInfo
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- CN107831953B CN107831953B CN201711335425.8A CN201711335425A CN107831953B CN 107831953 B CN107831953 B CN 107831953B CN 201711335425 A CN201711335425 A CN 201711335425A CN 107831953 B CN107831953 B CN 107831953B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
Abstract
The invention provides an infrared touch screen scanning method and device and infrared touch equipment. According to the infrared touch screen scanning method, after the position of a touch point is preliminarily determined, the scanning range is determined according to the position of the touch point, and then infrared scanning is carried out in an hourglass-shaped scanning mode to obtain a touch area. And finally, determining the specific position of the touch point according to the overlapping area of the multiple touch areas. The hourglass-shaped scanning mode enables the light paths of the area where the touch points are located to be the most dense, the distance between the light paths is smaller than the tube spacing between two adjacent infrared transmitting tubes, the touch points with small size can be detected, the specific positions of the touch points are determined, and the missing detection phenomenon is avoided. In the infrared touch screen scanning method provided by the invention, the denser the scanning light path forming the hourglass-shaped scanning mode is, the more easily the touch points are detected, so that the undetected rate of the touch points is lower, and the positioning accuracy of the touch points is higher.
Description
Technical Field
The invention relates to the technical field of infrared touch, in particular to an infrared touch screen scanning method and device and infrared touch equipment.
Background
The infrared touch screen comprises a touch screen and a plurality of groups of infrared geminate transistors arranged on the outer frame of the touch screen. Each group of infrared pair transistors comprises an infrared transmitting tube and an infrared receiving tube. The infrared transmitting tubes are arranged on two adjacent sides of the outer frame, and the other two sides of the outer frame are provided with the infrared receiving tubes, as shown in figure 1. The infrared emission tubes are used for emitting infrared rays, each infrared emission tube is provided with a plurality of emission directions, and each emission direction forms a scanning direction. The infrared receiving tube located in each scanning direction is used for receiving the infrared ray in the scanning direction. Therefore, the infrared ray detection network consisting of a plurality of infrared ray paths is formed on the surface of the touch screen by the plurality of groups of infrared pair tubes.
When the touch object touches the infrared touch screen, the infrared light can be shielded, and a touch point is formed on the touch screen. The specific position of the touch point is determined according to the light path data of the shielded infrared ray. Specifically, when a plurality of groups of infrared pair tubes perform infrared scanning on the infrared touch screen, in a scanning period, all the infrared pair tubes scan in the same scanning direction, so that a first position area of a touch point is determined according to a blocked infrared light path. In the next scanning period, all the infrared geminate transistors scan according to the other scanning direction, and then a second position area of the touch point is determined according to the infrared light blocking path. A plurality of position areas of the touch point can be determined according to different scanning directions, and further, the specific position of the touch point is determined according to the overlapping area of the position areas.
When the infrared touch screen is subjected to infrared scanning by the multiple groups of infrared pair tubes, in each scanning direction, the distance between every two adjacent parallel light paths is the tube distance between every two adjacent infrared transmitting tubes. In order to ensure that at least one infrared light path is blocked in each scanning direction when the touch point is at any position, the minimum diameter of the touch object is required to be not less than 1 tube pitch. As shown in fig. 2, when the diameter of the touch point a is greater than 1 tube pitch, the infrared light path is blocked in each scanning direction, so that the specific position of the touch point a can be detected. When the diameter of the touch point b is smaller than 1 tube pitch, in a certain scanning direction, such as the vertical direction in fig. 2, the touch point b falls on the infrared optical path, the infrared optical path in the scanning direction is blocked, and thus the position area of the touch point b in the scanning direction is determined. In another scanning direction, such as the oblique direction in fig. 2, if the touch point b falls between two adjacent infrared light paths, no infrared light path in the scanning direction is blocked, and it is determined that there is no touch point b in the scanning direction, so that it is determined that the touch point b detected last time is a false point. When the touch point b is judged as a false point, the infrared touch screen does not respond to the touch. Therefore, when the diameter of the touch point is smaller than 1 tube pitch, the conventional infrared scanning method has a missing detection phenomenon, and then the infrared touch screen cannot respond to the touch.
Disclosure of Invention
The invention provides an infrared touch screen scanning method and device and an infrared touch device, and aims to solve the problem that detection omission of touch points exists in the existing touch point position determining method.
In a first aspect, the present invention provides a method for scanning an infrared touch screen, where the method includes:
determining a target scanning area of a current scanning period according to coordinates of a touch point determined by scanning the touch screen in a previous scanning period;
selecting at least any one projection point of the target scanning area on a first N bisector of the touch screen as a central point of a scanning light path, wherein the N bisector is a bisector in the vertical and/or horizontal direction of the touch screen, and N is an integer greater than or equal to 2; the first N bisector is an N bisector which does not pass through the target scanning area;
determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex;
and controlling infrared geminate transistors in the infrared touch screen to respectively perform infrared scanning on the sector scanning areas to obtain touch areas of the touch points.
In a second aspect, the present invention provides an infrared touch screen scanning device, comprising:
the target scanning area determining module is used for determining a target scanning area of the current scanning period according to the coordinates of the touch points determined by scanning the touch screen in the previous scanning period;
the scanning light path central point determining module is used for selecting at least any one projection point of the target scanning area on a first N bisector of the touch screen as a scanning light path central point;
the sector scanning area determining module is used for determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex;
and the infrared scanning module is used for controlling infrared geminate transistors in the infrared touch screen to respectively perform infrared scanning on the sector scanning areas to obtain touch areas of the touch points.
In a third aspect, the present invention provides an infrared touch device, which includes an infrared touch screen and the infrared touch screen scanning apparatus in the second aspect.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention provides a method and a device for scanning an infrared touch screen and infrared touch equipment. In the infrared touch screen scanning method, touch points are detected in the process of scanning the infrared touch screen according to a preset scanning mode. And determining a target scanning area of the current scanning period according to the coordinates of the touch point detected in the previous scanning period. Selecting at least any one projection point of a target scanning area on a first N bisector of the touch screen as a central point of a scanning light path, wherein the N bisector is a bisector in the vertical and/or horizontal direction of the touch screen, and N is an integer greater than or equal to 2; the first bisector N is a bisector N that does not pass through the target scanning area. And determining a sector scanning area covering the target scanning area by taking the central points of the two scanning light paths as vertexes. And controlling the infrared pair transistors in the infrared touch screen to respectively scan the determined sector scanning areas to obtain the touch areas of the touch points. When the infrared geminate transistors scan the sector scanning area, infrared rays emitted by infrared emission tubes in the infrared geminate transistors pass through the central point of a scanning light path, and therefore all infrared light paths form an hourglass-shaped structure, namely, when the infrared light paths perform infrared scanning according to the sector scanning area, scattering hourglass-shaped scanning is performed by taking the central point of the scanning light path as an intersection point, which is completely different from a parallel scanning light path in the prior art. Because all infrared light paths pass through the central point of the scanning light path, the scanning light paths near the central point of the scanning light path are the densest, and the distance between two adjacent scanning light paths is less than the tube spacing of two infrared transmitting tubes, so that a touch point with a small volume can shield infrared rays and form a touch area. Therefore, the infrared touch screen scanning method provided by the invention can avoid the phenomenon of missing detection in the existing parallel scanning light path.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic structural diagram of a related art mid-IR touch screen;
FIG. 2 is a diagram of an optical path structure of an infrared ray scanning touch point in the related art;
fig. 3 is a schematic detection flow diagram of an infrared touch screen scanning method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a scanning area of a square target and a projection structure thereof according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a circular target scanning area and its projection according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an infrared touch screen trisected in the horizontal direction according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a sector scan area identified according to a circular scan area according to an embodiment of the present invention;
FIG. 8 is a block diagram of a sector scan area identified from a square scan area according to an embodiment of the present invention;
fig. 9 is a schematic diagram of scanning optical paths of an infrared touch screen according to an embodiment of the present invention in a horizontal trisection manner;
fig. 10 is a schematic diagram of scanning optical paths of an infrared touch screen in a horizontal direction at two equal time intervals according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of selecting a first N bisector when the division value N is greater than or equal to 3 according to an embodiment of the present invention;
fig. 12 is a schematic view of a touch point positioning structure of an infrared touch screen in two equal time divisions in the horizontal direction according to an embodiment of the present invention.
Detailed Description
When the infrared touch screen scans, all infrared transmitting tubes in the infrared pair tubes transmit infrared light rays according to the same transmitting direction, so that parallel infrared light paths are formed, and the distance between every two adjacent parallel light paths is the tube distance between every two adjacent infrared transmitting tubes. In order to ensure that at least one infrared light path is blocked in each scanning direction when the touch point is at any position, the minimum diameter of the touch object is required to be not less than 1 tube pitch. As shown in fig. 2, when the diameter of the touch point a is greater than 1 tube pitch, the infrared light path is blocked in each scanning direction, so that the specific position of the touch point a can be detected. When the diameter of the touch point b is smaller than 1 tube pitch, in a certain scanning direction, such as the vertical direction in fig. 2, the touch point b falls on the infrared optical path, the infrared optical path in the scanning direction is blocked, and thus the position area of the touch point b in the scanning direction is determined. In another scanning direction, such as the oblique direction in fig. 2, if the touch point b falls between two adjacent infrared light paths, no infrared light path in the scanning direction is blocked, and it is determined that there is no touch point b in the scanning direction, so that it is determined that the touch point b detected last time is a false point. When the touch point b is judged as a false point, the infrared touch screen does not respond to the touch. Therefore, when the diameter of the touch point is smaller than 1 tube pitch, the conventional infrared scanning method has a missing detection phenomenon, and then the infrared touch screen cannot respond to the touch.
In view of the above situation, an embodiment of the present invention provides an infrared touch screen scanning method. The core idea of the scanning method is as follows: when the touch point is detected for the first time according to a preset scanning mode, the original parallel scanning light path is changed into an hourglass-shaped light path or a fan-shaped scanning light path for scanning detection, so that the touch point with a smaller volume is detected again under the dense infrared light path, the touch point is judged to be a real point, and the specific position of the touch point is determined.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram illustrating a detection flow of an infrared touch screen scanning method according to an embodiment of the present invention.
As shown in fig. 3, the infrared touch screen scanning method provided by the embodiment of the invention includes:
step S01: and determining a target scanning area of the current scanning period according to the coordinates of the touch points determined by scanning the touch screen in the previous scanning period.
The infrared touch screen carries out periodic infrared scanning according to a preset scanning mode. When partial infrared rays are detected to be blocked, touch points are obtained according to the blocked infrared ray data, and therefore the coordinates scanned by the touch points in the previous scanning period are determined. And determining a target scanning area of the current scanning period according to the coordinates of the touch point. The method comprises the following specific steps:
step S011: and scanning the infrared touch screen according to a preset scanning mode to determine the coordinates of the touch point.
In the embodiment of the invention, before the touch point is scanned and the coordinate of the touch point is determined, the infrared touch screen carries out periodic infrared scanning according to a preset scanning mode. The preset scanning mode adopts a global scanning method or a tracking scanning method commonly used by the existing infrared touch screen. If the preset scanning mode adopts a global scanning method, all the infrared transmitting tubes periodically scan the infrared touch screen in a full screen mode according to the original set parallel light path scanning mode. When a touch object touches the infrared touch screen, if a touch point formed by the touch object falls on an infrared ray emitted by the infrared emission tube, the infrared ray is shielded, and then the coordinate of the touch point is obtained according to shielding data of the infrared ray. Because all the infrared transmitting tubes carry out periodic full-screen scanning on the infrared touch screen according to the original set scanning mode, the global scanning method can comprehensively scan the infrared touch screen and cannot miss scanning. When the preset scanning mode adopts a tracking scanning method, firstly, an overall scanning method is adopted for infrared scanning. When the touch point is scanned, the touch point is tracked again, and partial scanning is carried out by adopting a parallel light path so as to determine the coordinate of the touch point. In practical applications, the adoption of the global scanning method, the tracking scanning method or other scanning methods is set according to actual conditions, as long as the coordinates of the touch points can be preliminarily determined.
Step S012: and determining a target scanning area of the current scanning period according to the coordinates of the touch point.
And expanding the preset unit length outwards by taking the coordinate of the touch point as a center to obtain a target scanning area. The target scanning area is a position area where a touch point may exist in the next current scanning period.
Specifically, as shown in fig. 4, the abscissa of the touch point is used as a reference point, and the infrared touch screen is expanded by x unit lengths to both sides along the horizontal direction of the infrared touch screen. Meanwhile, the ordinate of the touch point is taken as a reference point, and the infrared touch screen is expanded by y unit lengths to two sides along the vertical direction of the infrared touch screen, so that a rectangular or square area with the length of 2x and the width of 2y is obtained, as shown by a thick solid line part in fig. 4. The rectangular or square area is the target scanning area obtained after the rectangular or square area is expanded outwards by taking the position coordinates of the touch point as the center.
As shown in fig. 5, a circular area having a radius of r is obtained by expanding the position coordinates of the touch point by r unit lengths in different directions, as shown by the thick solid line in fig. 5. The circular area is a target scanning area obtained after the circular area expands outwards by taking the position coordinates of the touch point as the center.
Of course, the illustrations in fig. 4 and 5 are only two examples provided by the embodiment of the present invention, and in practical applications, the target scanning areas with different shapes may also be formed by expanding different unit lengths in different directions with the position coordinates of the touch point as the center. Since the moving speed of the touch object is limited, the unit length and direction of the expansion can be determined according to the moving speed of the touch object, the scanning speed of the infrared emission tube, and the like.
Step S02: selecting at least any one projection point of a target scanning area on a first N bisector of the touch screen as a central point of a scanning light path, wherein the N bisector is a bisector of the touch screen in the vertical and/or horizontal direction, and N is an integer greater than or equal to 2; the first bisector N is a bisector N that does not pass through the target scanning area.
After the target scanning area is determined, N bisectors in the vertical and/or horizontal direction of the touch screen are determined, and the N bisectors which do not pass through the target scanning area are selected to be the first N bisectors. The target scanning area has a projection point on the first N bisector of the touch screen. And selecting at least one projection point from the projection points as the central point of the scanning light path. The method comprises the following specific steps:
step S021: a bisector of the touch screen is determined.
A division value N is set in advance, and the division value N is an integer greater than or equal to 2. Dividing the infrared touch screen into N equal parts according to a preset division value in the horizontal direction or the vertical direction of the touch screen to obtain N-1 bisectors of the touch screen. When N is 2, the infrared touch screen is equally divided into two parts along the horizontal direction or the vertical direction of the touch screen, and an equal division line of the touch screen is generated, such as a thin solid line in the horizontal direction shown in fig. 4. When N is 3, the infrared touch screen is equally divided into 3 parts along the horizontal direction or the vertical direction of the touch screen, and two bisectors of the touch screen are generated, such as two thin solid lines in the horizontal direction shown in fig. 6.
Step S022: and selecting an N bisector which does not pass through the target scanning area as a first N bisector.
And judging whether the N equal division lines of the touch screen pass through the target scanning area. And if the N bisector of the touch screen does not pass through the target scanning area, selecting the N bisector of the touch screen as a first N bisector. As shown in fig. 6, a bisector of the touch screen in the horizontal direction is selected, which is denoted by the reference numeral.
When the infrared geminate transistors perform periodic infrared scanning, different division values N are set in different scanning periods to form different scanning light paths, and therefore the probability that touch points are detected is improved. In order to reduce the number of bisectors of the infrared touch screen and shorten the calculation time, in the embodiment of the present invention, the division value N preferably has a value of 2 to 4.
Step S023: and determining the central point of the scanning light path according to the projection of the target scanning area on the first N bisector.
The determination of the central point of the scanning optical path is specifically described below by taking a rectangular target scanning area as an example, and for a circular or other-shaped target scanning area, the determination method of the central point of the scanning optical path is the same as that for the rectangular target scanning area, and details are not repeated here.
As shown in fig. 4, the infrared touch screen is divided into two equal parts in the horizontal direction and the vertical direction, so as to form two touch screen equal division lines in different directions, and the two touch screen equal division lines do not pass through the target scanning area, that is, the two touch screen equal division lines are the first N equal division lines in different directions of the touch screen. Referring to the first N bisectors in the horizontal direction, the target scanning area forms a projection on the first N bisectors, and the projection is composed of a plurality of projection point groupsSo, as a shaded portion. And selecting any one projection point from the plurality of projection points as a central point of the scanning light path. Because the projection point exists in a plurality of numbers, at least one scanning light path central point can be selected. E.g. the central points O and O of the scanning optical path on the first N bisector in the horizontal direction1. The method for determining the central point of the scanning optical path in the vertical direction of the touch screen is the same as the method for determining the central point of the scanning optical path in the horizontal direction of the touch screen, e.g. the central point O of the scanning optical path determined in the vertical direction of the touch screen2And O3。
As is apparent from the above description, when N is 2, a plurality of scanning optical path center points can be respectively determined on the first N bisectors in the horizontal direction and the vertical direction. In the embodiment of the invention, the boundary line and/or the projection point of the center line of the target scanning area on the first N bisector of the touch screen are preferentially selected as the center points of the scanning light path, and the boundary line and the center line are perpendicular to the first N bisector. Specifically, as shown in fig. 4, referring to a first N bisector of the infrared touch screen in the horizontal direction, a boundary line and a center line of the target scanning area perpendicular to the first N bisector are selected, such as two thin vertical solid lines and two thin vertical dotted lines perpendicular to the horizontal line. The boundary line and the center line of the target scanning area form a projection point O on the first N bisector0O and O1The projected point O0O and O1I.e. the selected central point O of the scanning light path0O and O1. Scanning light path central point O in vertical direction of infrared touch screen2、O3And O4The method for determining the center point of the scanning optical path in the horizontal direction is the same as the method for determining the center point of the scanning optical path in the horizontal direction. The center point O of the scanning optical path0、O、O1、O2、O3And O4The boundary point and the central point of the projected point of the target scanning area on the first N bisector of the touch screen are special points, so that the projected point O is used0、O、O1、O2、O3And O4The center point of the scanning optical path is more representative, the center point of the scanning optical path is convenient to rapidly determine, and the calculation time is shortened.
A plurality of projection points of the target scanning area on the first N bisector can be selected as the central point of the scanning light path, and the more projection points are selected, the more touch areas are finally determined in step S04, and the more accurate the positioning is.
Further, as shown in FIG. 7, if the projection point O is selected1For the central point of the scanning optical path, the scanning optical path B1a4 passing through the edge of the target scanning area does not exist, i.e. no infrared transmitting tube exists on the transmitting side of the infrared touch screen. Therefore, in order to scan the edge position of the target scanning area, the projection point located at the projection center is selected as the scanning optical path center point, such as the projection point O. Since the projection point O is located at the center of the projection, the determined scanning light path central point O is located at the center of the target scanning area when viewed from the vertical direction of the touch screen, so that the angle of the scanning light path passing through the scanning light path central point and the edge of the target scanning area deviating from the vertical direction of the touch screen is smaller, and an infrared emission tube on the emission side of the infrared touch screen is easier to exist. When the value of the division threshold value N of the infrared touch screen is larger, more scanning light path center points can be determined.
Step S03: and determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex.
And after the central point of the scanning light path is determined, confirming a sector scanning area covering the target scanning area by taking the central point of one scanning light path as a vertex. Since the foregoing steps determine at least one scanning optical path center point, at least one sector-shaped scanning area covering the target scanning area can be confirmed based on the scanning optical path center points, respectively. Since the sector-shaped scanning area covers the target scanning area, two boundary lines of the sector-shaped scanning area are located at least outside the target scanning area.
Further, if the angle between two boundary lines of the sector scanning area is larger, the number of the selected infrared emission tubes is larger, and the scanning time is prolonged. In order to reasonably arrange the emission of the infrared emission tube and shorten the scanning time, the smaller the sector scanning area is, the better the sector scanning area is, on the premise of covering the target scanning area. I.e., two boundary lines of the sector-shaped scanning area fall on the boundary of the target scanning area, the infrared emission tube scans only the area including the target scanning area.
In order to scan only the area including the target scanning area when the infrared emission tube scans according to the sector scanning area, the minimum boundary line of the sector scanning area covering the target scanning area should be determined.
Specifically, the method comprises the following steps:
step S031: and if the connecting line of the boundary point of the target scanning area and the central point of the scanning light path does not pass through the target scanning area, selecting the boundary point as the boundary point of the scanning light path.
And selecting boundary points in the target scanning area. And judging whether the connecting line of the selected boundary point and the central point of the scanning light path passes through the target scanning area. And if the connecting line of the boundary point and the central point of the scanning light path passes through the target scanning area, excluding the boundary point. And if the connecting line of the boundary point and the central point of the scanning light path does not pass through the target scanning area, selecting the boundary point as the boundary point of the scanning light path.
As shown in fig. 8, if a scanning optical path central point O is selected in the square target scanning area, boundary points a and b of the scanning optical path can be obtained according to the above method, and a sector target area aOb is determined. If the central point O of the scanning optical path is selected1Then, the boundary points a and b of the scanning light path can be obtained according to the method, and further the sector-shaped target area aO is determined1b. As shown in fig. 7, if a central point O of the scanning optical path is selected, boundary points c and d of the scanning optical path can be obtained according to the above method, and a sector-shaped target area cOd is determined. If the central point O of the scanning optical path is selected1Then, the boundary points e and f of the scanning light path can be obtained according to the method, and the fan-shaped target area eO can be determined1f。
As can be seen from the above, after the scanning optical path central point is selected in advance, the scanning optical path boundary point can be determined by judging whether the connection line between the boundary point of the target scanning area and the selected scanning optical path central point passes through the target scanning area, so that the determination of the scanning optical path boundary point is related to the selection of the scanning optical path central point, that is, one scanning optical path central point corresponds to a group of scanning optical path boundary points.
Step S032: and determining a sector scanning area by taking the central point of the scanning light path as a vertex and according to a connecting line of the central point of the scanning light path and each boundary point of the scanning light path.
After the scanning light path boundary point is determined, a sector scanning area is determined according to a connection line between the scanning light path center point and the scanning light path boundary point corresponding to the scanning light path center point, with the scanning light path center point as a vertex, such as the sector scanning area covering the target scanning area shown in fig. 7 and 8.
In order to determine the sector scanning areas from different directions of the touch screen, the central points of the selected scanning light paths are respectively located on N equal dividing lines of the touch screen in different directions. As shown in FIG. 8, the center points O and O of the scanning optical path are selected2Thereby forming two sector scanning areas with different opening directions. When the infrared light respectively scans the two sector scanning areas in the infrared mode, touch areas of different directions of the touch point can be obtained, and then the final coordinate of the touch point can be determined.
Step S04: and controlling infrared geminate transistors in the infrared touch screen to scan the sector scanning areas respectively to obtain touch areas of the touch points.
Specifically, the specific position of the infrared pair transistor needs to be determined before the infrared pair transistor in the infrared touch screen is scanned, so that the infrared ray emitted by the infrared emission tube is determined in the sector scanning area.
The specific position determination of the infrared pair tube comprises the following steps:
step S041: an initial optical path and a final optical path are determined based on the boundary line of the sector scan area.
And determining an initial light path and a termination light path of the infrared scanning according to the boundary line of the sector scanning area, wherein the initial light path and the termination light path both pass through the central point of the scanning light path.
Step S042: and determining an initial infrared emission tube and a terminal infrared emission tube in the infrared pair tubes in the scanning sector scanning area according to the initial light path and the terminal light path.
After the initial light path and the termination light path are determined, the infrared transmitting tubes positioned on the initial light path and the termination light path are respectively an initial infrared transmitting tube and a termination infrared transmitting tube in the infrared pair tubes in the scanning sector scanning area, and the initial infrared receiving tube and the termination infrared receiving tube respectively receive infrared rays emitted by the infrared transmitting tubes on the opposite side. As shown in fig. 8, in the sector scanning area determined by the scanning optical path central point O, the positions of the initial infrared transmitting tube and the terminal infrared transmitting tube are a1 and a2, respectively, and the positions of the opposite sides a4 and A3 of the infrared touch screen are the initial infrared receiving tube and the terminal infrared receiving tube, respectively.
Step S043: and if the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is greater than the distance between the center point of the scanning light path and the receiving side of the infrared touch screen, sequentially increasing N-1 middle infrared transmitting tubes in the infrared pair tubes by taking the initial infrared transmitting tube as a reference. And if the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is less than or equal to the distance between the center point of the scanning light path and the receiving side of the infrared touch screen, sequentially increasing 1 middle infrared transmitting tube in the infrared pair tubes by taking the initial infrared transmitting tube as a reference.
Since the equal division number of the infrared touch screen is different, and the positions of the central points of the scanning light paths are different, all the infrared transmitting tubes between the initial infrared transmitting tube and the terminating infrared transmitting tube do not need to emit infrared light, and the positions of the middle infrared transmitting tubes need to be further determined. The middle infrared transmitting tube is an infrared transmitting tube which is positioned between the initial infrared transmitting tube and the termination infrared transmitting tube and needs to emit infrared rays when scanning a sector scanning area. The initial infrared emission tube, the middle infrared emission tube and the termination infrared emission tube are all located on the same side of the infrared touch screen, and are located on the lower bottom edge or the right side edge of the infrared touch screen in the attached drawing 1 at the same time.
Specifically, if the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is greater than the distance between the center point of the scanning light path and the receiving side of the infrared touch screen, the positions of the middle infrared transmitting tubes to be scanned are sequentially increased by N-1 times by taking the initial infrared transmitting tube as a reference until the position reaches the position of the terminating infrared transmitting tube. The infrared receiving tube receives the infrared ray emitted by the infrared emitting tube at the opposite side. As shown in fig. 9, when N is 3, the infrared touch screen is divided into three equal parts. And selecting the central point of a scanning light path positioned above the target scanning area to determine a sector scanning area, and further performing infrared scanning. And when the selected central point of the scanning light path is O, the distance between the central point O of the scanning light path and the transmitting side of the infrared touch screen is greater than the distance between the central point of the scanning light path and the receiving side of the infrared touch screen. At this time, the position of the initial infrared transmitting tube is set as the ith infrared transmitting tube, and the position of the corresponding infrared receiving tube is set as j. The infrared touch screen is divided into three equal parts by the threshold, so that the transmission distance of the infrared light path along the vertical direction of the infrared touch screen is divided into a ratio of 1:2 by taking the central point O of the scanning light path as a reference. In order to fully utilize the infrared receiving tubes, namely, the infrared receiving tubes adjacent to the terminated infrared receiving tube can receive infrared rays, the positions of the infrared receiving tubes are j-1, and the rest of the middle infrared receiving tubes are sequentially decreased by 1. Corresponding to the middle infrared receiving tubes, because the transmission distance of the infrared light path along the vertical direction of the infrared touch screen is divided into a ratio of 1:2, according to the principle of similarity of triangles, after the initial infrared transmitting tube emits infrared light, the number of the next infrared transmitting tube to be scanned is i +2, and the number of the other middle infrared receiving tubes is sequentially increased by 2. Fig. 9 shows all the scanning optical paths of the sector scanning area corresponding to the central points of the scanning optical paths when the central points of the two scanning optical paths are selected.
If the distance between the central point of the scanning light path and the transmitting side of the infrared touch screen is less than or equal to the distance between the central point of the scanning light path and the receiving side of the infrared touch screen, the positions of the middle infrared transmitting tubes to be scanned are sequentially increased by 1 by taking the initial infrared transmitting tube as a reference until the position of the middle infrared transmitting tube reaches the position of the terminating infrared transmitting tube. As shown in fig. 10, when N is 2, the infrared touch screen is equally divided by the horizontal center line, and at this time, the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is equal to the distance between the center point of the scanning light path and the receiving side of the infrared touch screen. At this time, the position of the initial infrared transmitting tube is set as the ith infrared transmitting tube, and the position of the corresponding infrared receiving tube is set as j. The number of the next infrared transmitting tubes to be scanned is i +1, and the number of the corresponding infrared receiving tubes is j-1. Fig. 10 shows all the scanning optical paths of the sector scanning area corresponding to the central point of the scanning optical path when the central points of the two scanning optical paths are selected.
After the sector scanning area and the infrared geminate transistors for scanning the sector scanning area are determined, the infrared emission tubes in the infrared geminate transistors are controlled to emit infrared rays. The emitted infrared light passes through the central point of the scanning light path and then passes through the sector scanning area, or the emitted infrared light passes through the central point of the scanning light path after passing through the sector scanning area. In the process that the infrared light passes through the sector scanning area, if the infrared light is shielded by the touch object, light path data is formed according to the position, the angle and other data of the shielded infrared light, and then the touch area of the touch object in the sector scanning area is determined. After the touch area is determined, the position of the touch point can be determined according to the touch area.
Further, in the infrared touch screen scanning method provided by the embodiment of the invention, when the division value N is greater than or equal to 3, one bisector closest to the target scanning area is selected as a first N bisector. Specifically, there are at least two bisectors in each of the horizontal and vertical directions of the touch screen. And if at least two bisectors do not pass through the target scanning area, selecting one bisector closest to the target scanning area as a first N bisector. In the case of the division value N of 3 as shown in fig. 11, both of the bisectors (i.e., the bisectors) of the touch screen in the horizontal direction do not pass through the target scanning area. The target scanning area has projection points on the bisector (I) of the touch screen, and if the projection point at the projection center is selected as the central point of the scanning light path, the central points a and b of the scanning light path are formed. And selecting two boundary points, such as c and d, in the target scanning area, and connecting ac, ad, bc and bd to form four scanning optical paths passing through different scanning optical path central points. As can be seen from fig. 11, the angle between the scanning optical paths ac and ad is larger than the angle between the scanning optical paths bc and bd, so that the coverage area of the sector scanning area determined by the scanning optical path central point a as the vertex is larger than the coverage area of the sector scanning area determined by the scanning optical path central point b as the vertex. When the infrared light path performs infrared scanning on the sector scanning area, more infrared light paths pass through the sector scanning area determined by taking the scanning light path central point a as the vertex, and the infrared light paths are denser, so that the scanning precision of the scanning light path on the sector scanning area can be enhanced, and the detection precision of a touch point is further enhanced.
Further, the infrared touch screen scanning method provided by the embodiment of the present invention further includes step S05: and determining the final coordinate of the touch point according to the overlapping area of the at least two touch areas.
After at least two touch areas of one touch point are determined, calculation is carried out according to the overlapping area of the at least two touch areas, and then the final coordinate of the touch point can be determined, and further the positioning of the touch point is realized. When N is 2, the final coordinates of the touch point are confirmed from the four touch areas in fig. 12.
Further, since the shape of the overlapping area formed by the plurality of touch areas is a polygon, the center point of the polygonal overlapping area can be determined as the final coordinate of the touch point for simplifying the calculation.
The embodiment of the invention also provides an infrared touch screen scanning device, which comprises:
the target scanning area determining module is used for determining a target scanning area of the current scanning period according to the coordinates of the touch points determined by scanning the touch screen in the previous scanning period;
the scanning light path central point determining module is used for selecting at least any one projection point of the target scanning area on a first N bisector of the touch screen as a scanning light path central point;
the sector scanning area determining module is used for determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex;
and the infrared scanning module is used for controlling the infrared geminate transistors in the infrared touch screen to scan the sector scanning areas respectively to obtain the touch areas of the touch points.
The embodiment of the invention also provides the infrared touch equipment which comprises the infrared touch screen and the infrared touch screen scanning device.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. An infrared touch screen scanning method is characterized by comprising the following steps:
determining a target scanning area of a current scanning period according to coordinates of a touch point determined by scanning the touch screen in a previous scanning period;
selecting at least any one projection point of the target scanning area on a first N bisector of the touch screen as a central point of a scanning light path, wherein the N bisector is a bisector in the vertical and/or horizontal direction of the touch screen, and N is an integer greater than or equal to 2; the first N bisector is an N bisector which does not pass through the target scanning area;
determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex;
and controlling infrared geminate transistors in the infrared touch screen to respectively perform infrared scanning on the sector scanning areas to obtain touch areas of the touch points.
2. The method according to claim 1, wherein the determining a sector scanning area covering the target scanning area with the central point of the scanning optical path as a vertex comprises:
if the connecting line of the boundary point of the target scanning area and the central point of the scanning light path does not pass through the target scanning area, selecting the boundary point as the boundary point of the scanning light path;
and determining a sector scanning area by taking the central point of the scanning light path as a vertex according to a connecting line of the central point of the scanning light path and each boundary point of the scanning light path.
3. The method according to claim 1, wherein before controlling the infrared tubes in the infrared touch screen to perform the infrared scanning on the sector scanning areas respectively, the method comprises:
determining an initial light path and a final light path according to the boundary line of the sector scanning area;
and determining an initial infrared emission tube and a termination infrared emission tube in the infrared pair tubes scanning the sector scanning area according to the initial light path and the termination light path.
4. The infrared touch screen scanning method of claim 3, wherein after determining an initial infrared emission tube and a terminal infrared emission tube of the infrared pair tubes scanning the sector scanning area according to the initial optical path and the terminal optical path, further comprising:
if the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is greater than the distance between the center point of the scanning light path and the receiving side of the infrared touch screen, sequentially increasing the positions of the middle infrared transmitting tubes in the infrared pair tubes by N-1 times by taking the initial infrared transmitting tube as a reference;
if the distance between the center point of the scanning light path and the transmitting side of the infrared touch screen is less than or equal to the distance between the center point of the scanning light path and the receiving side of the infrared touch screen, the positions of middle infrared transmitting tubes in the infrared pair of tubes are sequentially increased by 1 by taking the initial infrared transmitting tube as a reference;
the middle infrared transmitting tube is an infrared transmitting tube which is positioned between the initial infrared transmitting tube and the termination infrared transmitting tube and needs to emit infrared rays when the sector scanning area is scanned.
5. The method according to claim 1, wherein determining the target scanning area of the current scanning cycle according to the coordinates of the touch point determined by scanning the touch screen in the previous scanning cycle comprises:
and expanding the preset unit length outwards by taking the coordinate of the touch point as a center to obtain a target scanning area of the current scanning period.
6. The infrared touch screen scanning method according to claim 1, wherein when N is greater than or equal to 3, one bisector N closest to the target scanning area in the first bisector N is selected, and at least any one projection point of the target scanning area on the closest bisector N is selected as the scanning optical path center point.
7. The infrared touch screen scanning method of claim 1, wherein the scanning optical path center points are respectively located on N bisectors of the touch screen in different directions.
8. The method according to claim 1, wherein selecting at least one projection point of the target scanning area on the first bisector N of the touch screen as a center point of a scanning light path comprises:
and selecting a projection point of a boundary line and/or a center line of the target scanning area on a first N bisector of the touch screen as a central point of a scanning light path, wherein the boundary line and the center line are perpendicular to the first N bisector.
9. An infrared touch screen scanning device, the device comprising:
the target scanning area determining module is used for determining a target scanning area of the current scanning period according to the coordinates of the touch points determined by scanning the touch screen in the previous scanning period;
the scanning light path central point determining module is used for selecting at least any one projection point of the target scanning area on a first N bisector of the touch screen as a scanning light path central point;
the sector scanning area determining module is used for determining a sector scanning area covering the target scanning area by taking the central point of the scanning light path as a vertex;
and the infrared scanning module is used for controlling infrared geminate transistors in the infrared touch screen to respectively perform infrared scanning on the sector scanning areas to obtain touch areas of the touch points.
10. An infrared touch device, characterized in that the infrared touch device comprises an infrared touch screen and the infrared touch screen scanning device of claim 9.
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| CN110275645B (en) * | 2019-06-12 | 2022-08-05 | 青岛海信商用显示股份有限公司 | Touch point identification method, touch point identification device, storage medium and touch device |
| CN110794994A (en) * | 2019-09-27 | 2020-02-14 | 深圳市天英联合教育股份有限公司 | Method and device for determining real contact |
| CN111078045A (en) * | 2019-11-29 | 2020-04-28 | 京东方科技集团股份有限公司 | Display device and touch detection method thereof |
| CN113126795B (en) * | 2019-12-31 | 2022-08-19 | 青岛海信商用显示股份有限公司 | Touch identification method of touch display device and related equipment |
| CN112606778A (en) * | 2020-12-23 | 2021-04-06 | 芜湖汽车前瞻技术研究院有限公司 | Central control display system based on holographic projection and automobile |
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