CN105955553B - Infrared touch screen scanning method and device - Google Patents
Infrared touch screen scanning method and device Download PDFInfo
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- CN105955553B CN105955553B CN201610450319.3A CN201610450319A CN105955553B CN 105955553 B CN105955553 B CN 105955553B CN 201610450319 A CN201610450319 A CN 201610450319A CN 105955553 B CN105955553 B CN 105955553B
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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
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Abstract
The invention discloses an infrared touch screen scanning method and device, relates to the technical field of touch control, and can solve the problems that in the prior art, when an infrared touch device is used for tracking and scanning, the scanning range is not accurate, and the scanning time is long. The specific scheme is as follows: determining a target area; determining a scanning range according to the vertex of the target area and the current scanning direction; scanning in the scanning range according to the scanning direction of the time to obtain a touch area where a touch point is located; and determining an overlapping area between the target area and the touch area as a target area in the next scanning direction. Because the target area is updated according to the touch area scanned last time, the scanning range calculated according to the target area is more accurate, and the scanning time is reduced. The invention is used for infrared touch screen scanning.
Description
Technical Field
The embodiment of the invention relates to the technical field of touch control, in particular to an infrared touch screen scanning method and device.
Background
Taking an infrared touch screen arranged on an infrared touch device as an example as shown in fig. 1, a plurality of infrared transmitting tubes are arranged on two adjacent sides of the infrared touch screen, and a plurality of corresponding infrared receiving tubes are arranged on two adjacent sides. The infrared transmitting tube is used for transmitting infrared light in a preset direction, the infrared receiving tube receives the infrared light, global scanning of the infrared touch screen in the preset direction is achieved, and in the scanning process, the propagation path of the infrared light is called as a light path. If a user touches the infrared touch screen, touch points on the infrared touch screen fall into the touch screen. The touch point can shield part of infrared light emitted by the infrared emission tube, namely part of light path is shielded, so that part of the infrared receiving tube cannot receive the infrared light, and the touch area where the touch point is located during the scanning can be determined according to the infrared receiving tube which does not receive the infrared light and the preset scanning direction. And then, based on the touch area, the tracking scanning in different directions is continued, so that the position of the touch point can be determined. If a plurality of scanning processes in different directions for determining the position of the touch point are taken as a scanning period, how to scan the infrared touch screen in the scanning period is a key for determining the position of the touch point.
In the related art, when infrared touch screen scanning is performed, the first scanning is global scanning, which is shown in fig. 2. Scanning the infrared touch screen through a light path between the infrared transmitting tube and the infrared receiving tube to obtain a touch area, and taking the touch area obtained by scanning for the first time as an area where a touch point is located, wherein the area is called a target area; in each subsequent scanning process, the scanning range is calculated according to the same target area, and scanning is carried out in the scanning range.
however, in the process of performing infrared touch screen scanning in the related art, each scanning takes a touch area obtained by first scanning as a target area, so that a scanning range calculated according to the target area is not accurate, and a problem of long scanning time exists.
Disclosure of Invention
in order to solve the problems that in the prior art, when an infrared touch device is used for tracking and scanning, a touch area obtained by scanning for the first time is used as a target area in each scanning, so that the scanning range calculated according to the target area is not accurate, and the scanning time is long, the embodiment of the invention provides an infrared touch screen scanning method and device. The technical scheme is as follows:
in a first aspect, a method for scanning an infrared touch screen is provided, where the method is applied to an infrared touch device including an infrared touch screen, the infrared touch device further includes an infrared transmitting tube and an infrared receiving tube, and is used to scan touch points on the infrared touch screen, and the scanning method in at least one scanning direction in one scanning cycle includes:
Determining a target area, wherein the target area is an area where a touch point determined before the scanning is located;
Determining a scanning range according to the vertex of the target area and the current scanning direction;
scanning in the scanning range according to the scanning direction of the time to obtain a touch area where a touch point is located;
And determining an overlapping area between the target area and the touch area as a target area in the next scanning direction.
In a second aspect, an infrared touch device is provided, where the infrared touch device includes an infrared touch screen, the infrared touch device further includes an infrared transmitting tube and an infrared receiving tube, and is used to scan touch points on the infrared touch screen, and the infrared touch device further includes:
A management unit for determining a target area; determining a scanning range according to the top point of a target area and the scanning direction, wherein the target area is an area where a touch point determined before the scanning is located;
The scanning unit is used for scanning in the scanning range determined by the management unit according to the scanning direction of the time to obtain a touch area where the touch point is located;
And the management unit is also used for determining the overlapping area between the target area and the touch area as the target area in the next scanning direction.
according to the infrared touch screen scanning method and device provided by the embodiment of the invention, the overlapping area between the target area and the touch area is used as the target area for next scanning, and the scanning range is calculated based on the target area for next scanning, namely, the scanning range is not calculated according to the fixed target area but is updated according to the touch area scanned last time.
drawings
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the distribution of infrared transmitting tubes and infrared receiving tubes in an infrared touch device;
FIG. 2 is a schematic view of a touch area for a first scan as provided by the prior art;
Fig. 3 is a schematic flowchart of a scanning method for an infrared touch screen according to an embodiment of the present invention;
FIG. 4 is a schematic view of a scanning range of a third scan according to an embodiment of the present invention;
FIG. 5 is a schematic view of a scanning range of a third scan provided by the prior art;
FIG. 6 is a schematic diagram of a touch area of a second scan according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a target area of a third scan according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a target area of a third scan provided by the prior art;
FIG. 9 is a flowchart illustrating an infrared touch screen scanning method according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of an infrared touch device according to an embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
the embodiment of the invention provides an infrared touch screen scanning method, which is applied to infrared touch equipment comprising an infrared touch screen and used for scanning touch points on the infrared touch screen. Still taking the infrared touch screen arranged on the infrared touch device as an example as shown in fig. 1, two adjacent sides of the infrared touch screen are uniformly provided with a plurality of infrared transmitting tubes, and two adjacent sides are uniformly provided with a plurality of corresponding infrared receiving tubes. For convenience of explanation, one side of the infrared emission tubes is taken as a first group of infrared emission tubes, and the side where the first group of infrared emission tubes is located is taken as an x-axis, and the unit length of the x-axis may be a distance between two adjacent infrared emission tubes on the x-axis. In addition, the other infrared emission tube is taken as a second group of infrared emission tubes, the side where the second group of infrared emission tubes is located is set as a y-axis, and the unit length of the y-axis can be the distance between two adjacent infrared emission tubes on the y-axis.
First, the concept in the embodiment of the present invention is explained:
scanning direction, wherein the direction determined by the connecting line of the infrared transmitting tube and the infrared receiving tube is selected as the scanning direction, and optionally, the scanning direction can be represented by the included angle between the light path of the infrared light transmitted by the infrared transmitting tube and the x axis or the y axis;
Scanning, namely, respectively and sequentially gating the infrared transmitting tube and the infrared receiving tube according to a preset scanning direction;
And a scanning period, wherein a plurality of scanning processes in different directions, which are performed by determining the position of the touch point, are taken as one scanning period.
based on the above, referring to fig. 3, the method for scanning the infrared touch screen in at least one scanning direction in one scanning period includes the following steps:
301. A target area is determined.
the target area is the area where the touch point is located determined before the current scanning.
It should be noted that, in a scanning cycle, if the previous scanning is a non-first scanning in the scanning cycle, determining the target area includes: and taking the overlapping area between the target area scanned last time and the touch area scanned last time as the target area scanned this time. Both the touch area and the overlap area are areas on the infrared touch screen. Since the overlap area is smaller than the target area scanned last time and smaller than the touch area scanned last time, when the overlap area between the target area scanned last time and the touch area scanned last time is used as the target area scanned this time, the scan range of the next scan calculated according to the target area scanned this time in the subsequent step 302 can be more accurate, and the scan time can be reduced.
if the previous scanning is the first scanning in the scanning period, the previous scanning scans in the basic direction to determine the touch area of the first scanning, the touch area of the first scanning is taken as the target area in the current scanning direction, and one scanning direction is selected from the x axis and the y axis as the basic direction, as shown in fig. 2, the basic direction may include two directions, i.e., a horizontal direction and a vertical direction, and an overlapping area of the touch area determined by the horizontal scanning and the touch area determined by the vertical scanning is taken as the touch area of the first scanning.
302. And determining a scanning range according to the top point of the target area and the current scanning direction.
The target area is located within the scan range. Optionally, determining a scanning range according to the vertex of the target area and the current scanning direction includes: determining the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the vertex of the target area; and taking the area between the infrared lights emitted by the infrared emission tubes with the largest serial number and the smallest serial number in the serial numbers of the infrared emission tubes as a scanning range.
Here, two ways of determining the serial number of the infrared transmitting tube are listed as follows:
Optionally, in the first mode, determining the serial number of the infrared transmitting tube by looking up a table, and then determining that the infrared light is transmitted in the current scanning direction, where the infrared light passes through the serial number of the infrared transmitting tube at the vertex of the target area, includes: and determining the infrared light emitted in the scanning direction of the time in a preset list, wherein the infrared light passes through the serial number of the infrared emitting tube at the vertex of the target area. It should be noted that the preset list is used to indicate the correspondence relationship among the scanning direction, the point through which the emitted infrared light passes, and the infrared emission tube serial number when scanning according to different scanning directions. It should be noted that the preset list may include M serial numbers of the infrared emission tubes corresponding to each point in the N points on the optical paths in M different scanning directions, so that the serial numbers of the infrared emission tubes may be determined according to the coordinates of the points and the scanning directions. Optionally, the N points may be intersections of the optical paths scanned in the horizontal direction and the optical paths scanned in the vertical direction, which may also include more points, and may be set by itself according to specific situations, which is not limited in this embodiment of the present invention. In addition, for the vertexes of the target area, some vertexes may not be in the preset list, and the serial number of the infrared emission tube corresponding to the point closest to the vertex may be searched in the preset list according to the scanning direction of the time, and the searched serial number of the infrared emission tube is used as the serial number of the infrared emission tube corresponding to the vertex.
Or, optionally, in the second mode, the serial number of the infrared transmitting tube is determined by formula calculation, and then the serial number is determinedthis scanning direction emission infrared light, and infrared light passes through the infrared transmitting tube sequence number at the summit of target area, includes: according to the formula m ═ k0*x0–y0)/k0Calculating the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the top point of the target area; wherein m is the calculated serial number of the infrared transmitting tube, k0The (x0, y0) vertex coordinates of the target region are the slope of the infrared light emitted in the present scanning direction.
For example, the infrared emitting tube numbers that emit infrared light in the current scanning direction and infrared light passes through a part of vertexes of the target area are determined in a first manner, and the infrared emitting tube numbers that emit infrared light in the current scanning direction and infrared light passes through another part of vertexes of the target area are determined in a second manner. In addition, the correspondence among the scanning direction, the point through which the emitted infrared light passes, and the infrared emission tube serial number in the preset list can also be calculated according to a formula in the second mode.
For example, taking the third scanning as an example, as shown in FIG. 4, the optical path a of the first scanning1、a2、a3、a4the enclosed area is a touch area which is scanned for the first time; the first scanning touch area is the second scanning target area, and the second scanning light path b1、b2The middle area is a touch area scanned for the second time, and an overlapping area between the touch area scanned for the second time and the target area is a target area scanned for the third time. The scanning range of the third scanning, namely the optical path c of the third scanning can be determined according to the vertex of the target area of the third scanning and the scanning direction of the third scanning1、c2And the target area of the third scanning is positioned in the scanning range of the third scanning. The scan direction of the third scan is at a third angle to the x-axis. The target area of the third scanning has A, B, C, D, E, F vertexes in total, and the infrared light is respectively emitted in the third scanning direction and passes through each vertexThe infrared transmitting tube serial number of (2), and determining the area between the infrared lights transmitted by the infrared transmitting tubes with the maximum serial number and the minimum serial number as the scanning range. It should be noted that, in fig. 4, the infrared light emitted from the infrared emitting tube with the largest and smallest serial numbers passes through the first vertex a and the second vertex B, respectively, and the coordinate of the first vertex a is (x)1,y1) The second vertex B has the coordinate of (x)2,y2) Optical path c of the third scanning1The light path c of the third scanning passes through the first vertex A2Passing through a second vertex B; according to the formula m1＝(k1*x1–y1)/k1，m2＝(k1*x2–y2)/k1It can be determined that the infrared light is emitted in the third scanning direction and the infrared light passes through the largest number and the smallest number, i.e., m, among the infrared emitting tube numbers of each vertex1And m2then the serial number of the infrared transmitting tube to be transmitted in the scanning is [ m ]1,m2]Wherein k is1Is the slope of the infrared light emitted in the third scanning direction, where k1is the tangent of the third angle.
Referring to fig. 5, compared with the target area and the scanning range of the third scanning provided by the embodiment of the present invention shown in fig. 4, fig. 5 shows the target area and the scanning range of the third scanning in the prior art. In the prior art, the touch area obtained by the first scanning is used as the target area of each subsequent scanning, so the target area of the third scanning in the prior art is larger than the target area of the third scanning in the embodiment of the present invention, and because the scanning range is determined according to the target area and the scanning direction of this time, the scanning range of the third scanning in the prior art is the optical path d1、d2the area in between. It can be seen that because the target area of the prior art is larger than that of the embodiments of the present invention, the optical path d in the prior art1、d2the distance between the two is obviously larger than the light path c of the embodiment of the invention1、c2the distance between them. Therefore, the scanning range of the third scanning in the prior art is larger than that of the first embodiment of the present inventionThe scanning range of the three-time scanning is more accurate and the scanning time is reduced compared with the prior art.
303. And scanning according to the scanning direction in the scanning range to obtain a touch area where the touch point is located.
optionally, when scanning is performed in the scanning range, the infrared emission tube in the scanning range emits infrared light to scan the touch point, so as to obtain the touch area. The touch area may be determined with a set of coordinates of the touch area, which may include vertex coordinates of the touch area. The touch area is determined according to the shielded infrared light within the scanning range, namely the serial number of the infrared receiving tube which does not receive the infrared light within the scanning range and the scanning direction of the time.
For example, taking the second scan as an example, see FIG. 6, e1、e2、e3、e4Are all the optical paths of the second scanning, wherein e1、e2The area in between is the scanning range of the second scanning, e3、e4the area between the two touch areas is the touch area scanned for the second time, and the infrared light emitted to the touch area is blocked.
304. And determining an overlapping area between the target area and the touch area as a target area in the next scanning direction.
since the overlapping area between the target area and the touch area is smaller than the target area and smaller than the touch area, when the overlapping area is used as the target area in the next scanning direction, the calculated scanning range is more accurate, and thus the scanning time can be reduced.
In the embodiment of the present invention, one scanning period includes multiple scanning, wherein at least two scanning cycles are included to perform steps 301 to 304 until all scanning cycles within the scanning period are completed. The method for determining the scanning range of the next scanning and scanning is the same as the principle of the current scanning, and is not repeated here, so that the target area of the next scanning is further reduced relative to the target area of the current scanning, the scanning range of the next scanning relative to the current scanning is more accurate, and the scanning time is reduced.
When one scanning cycle is completed, barycentric coordinates of an overlapping area of the touch area scanned last and the target area scanned last in the scanning cycle may be calculated, and the barycentric coordinates may be used as position coordinates of the touch point, so that the position of the touch point is determined through one scanning cycle.
It should be noted that, the embodiment corresponding to fig. 3 is described by taking one touch point as an example, and does not represent that the embodiment of the present invention is limited thereto, and the infrared touch screen scanning method provided in the embodiment of the present invention may also scan multiple touch points at the same time, that is, in a multi-point touch scene, multiple touch points are scanned at the same time in one scanning period, and the scanning principle is the same as that described in the embodiment corresponding to fig. 3, and is not described here again.
taking the third scanning as an example, referring to fig. 7 and 8, fig. 7 shows a target area of the third scanning according to an embodiment of the present invention, and fig. 8 shows a target area of the third scanning in the prior art. Because the target area of the third scanning is the overlapping area of the target area of the second scanning and the touch area as shown in fig. 7 in the embodiment of the present invention, the target area of the third scanning is smaller than the target area of the second scanning, and the target area of the second scanning is the touch area of the first scanning. In the prior art, as shown in fig. 8, the target area scanned each time is fixed and is a touch area scanned for the first time, so that compared with the prior art, the target area scanned for the third time in the embodiment of the present invention is reduced, and the target area scanned each time thereafter is smaller than the target area in the prior art, especially in the multi-touch scene shown in fig. 7, the area at the lower left corner has no touch point and is also scanned, and compared with the prior art, the embodiment of the present invention scans a small part of the area at the lower left corner without touch point, thereby greatly reducing the number of infrared emission tubes emitting infrared light and reducing the time consumed for scanning.
based on the infrared touch screen scanning method described in the embodiment corresponding to fig. 3, another embodiment of the present invention provides an infrared touch screen scanning method, which is applied to an infrared touch device provided with an infrared touch screen, and is used for scanning a new touch point falling on the infrared touch screen while scanning the touch point and performing tracking scanning on the touch point. In order to ensure that a new touch point falling into the infrared touch screen can be scanned, the method provided by this embodiment may also perform global scanning simultaneously when performing infrared touch screen scanning according to the manner of the above embodiment. The global scanning mode is not limited in this embodiment, and in this embodiment, global scanning is performed in segments as an example. When the infrared touch control device is specifically implemented, a first group of infrared transmitting tubes and a second group of infrared transmitting tubes are uniformly arranged on two adjacent sides of the infrared touch control device respectively, the first group of infrared transmitting tubes are S-section infrared transmitting tubes, the second group of infrared transmitting tubes are T-section infrared transmitting tubes, each section comprises at least one infrared transmitting tube, and S and T are positive integers. The edge where the first group of infrared emission tubes are located is located on an x axis, the edge where the second group of infrared emission tubes are located is located on a y axis, the unit length of the x axis is the distance between two adjacent infrared emission tubes on the x axis, and the unit length of the y axis is the distance between two adjacent infrared emission tubes on the y axis. Referring to fig. 9, the infrared touch screen scanning method provided in this embodiment includes the following steps:
901. And controlling each infrared transmitting tube in the S-section infrared transmitting tube and the T-section infrared transmitting tube to carry out global scanning to obtain a first-scanned touch area.
The global scan is for the entire infrared touch screen.
902. a target area is determined.
the target area is the area where the touch point is located determined before the current scanning. When the current scanning is larger than or equal to the second scanning, the target area of the current scanning is the overlapping area between the target area of the last scanning and the touch area.
903. And determining a scanning range according to the top point of the target area and the current scanning direction.
The target area is located within the scan range. The specific implementation process of this step can refer to step 302 in the embodiment shown in fig. 3, and is not described here again.
904. And scanning according to the scanning direction in the scanning range to obtain a touch area where the touch point is located.
The specific implementation process of this step can refer to step 303 in the embodiment shown in fig. 3, and details are not described here.
905. And determining an overlapping area between the target area and the touch area as a target area in the next scanning direction.
The specific implementation process of this step can refer to step 304 in the embodiment shown in fig. 3, and is not described here again.
Steps 902-905 are performed in a loop until the end of the scanning period.
It should be noted that, in the process of scanning the infrared touch screen according to the above steps, optionally, the infrared touch screen scanning method provided in this embodiment further includes the following steps:
906. And controlling the S-th infrared emission tube in the S-section infrared emission tube and the T-th infrared emission tube in the T-section infrared emission tube to scan new touch points.
Wherein T is an integer within [1, T ], S is an integer within [1, S ], and step 906 is independent of steps 902-905 of the loop, and step 906 can be executed in the process of executing steps 902-905. Therefore, the scanning of the tracking scanning of the scanned touch points can be carried out, and simultaneously, new touch points can be continuously scanned. For example, after the s-th infrared transmitting tube of the first set of infrared transmitting tubes performs the tracking scan according to step 904, the s + 1-th infrared tube scans for a new touch point according to step 906.
Optionally, the infrared touch screen scanning method provided in this embodiment further includes:
907. And calculating barycentric coordinates of an overlapping area between the touch area scanned last and the target area scanned last in the scanning period, and taking the barycentric coordinates as position coordinates of the touch point.
thus, through steps 901-907, the position of the touch point of the user can be determined relatively accurately, the touch operation of the user is responded, and meanwhile, a new touch point can be scanned. In this embodiment, the coordinate of one touch point is determined as an example, but the embodiment of the present invention is not limited thereto, and when there are multiple touch points, the coordinate of each touch point may be determined according to the method described in 901 to 907 in this embodiment.
in this embodiment, the infrared touch device can scan new touch points while tracking and scanning the scanned touch points, so as to avoid missing new touch points, respond to user operation in time, and improve user experience.
Based on the infrared touch screen scanning method described in the embodiment corresponding to fig. 2 or fig. 9, an embodiment of the present invention provides an infrared touch device, where the infrared touch device includes an infrared touch screen, and is configured to execute the infrared touch screen scanning method described in the embodiment corresponding to fig. 2 and fig. 9 to scan a touch point on the infrared touch screen, and referring to fig. 10, the infrared touch device 100 includes: management section 1001 and scanning section 1002.
The management unit 1001 is configured to determine a target area; determining a scanning range according to the top point of a target area and the scanning direction, wherein the target area is an area where a touch point determined before the scanning is located;
A scanning unit 1002, configured to scan in the scanning range determined by the management unit 1001 according to the current scanning direction, so as to obtain a touch area where a touch point is located;
the management unit 1001 is further configured to determine an overlap area between the target area and the touch area as a target area in a next scanning direction.
Optionally, the management unit 1001 is further configured to determine an infrared transmitting tube serial number that transmits infrared light in the current scanning direction, where the infrared light passes through a vertex of the target area; and taking the area between the infrared lights emitted by the infrared emission tubes with the largest serial number and the smallest serial number in the serial numbers of the infrared emission tubes as a scanning range.
optionally, the management unit 1001 is further configured to determine, in the preset list, an infrared emitting tube serial number that emits infrared light in the current scanning direction, where the infrared light passes through a vertex of the target area.
Optionally, the management unit 1001 is further configured to perform the following formulam＝(k0*x0–y0)/k0Calculating the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the top point of the target area;
Wherein m is the calculated serial number of the infrared transmitting tube, k0(x) is the slope of the infrared light emitted in the current scanning direction0，y0) The vertex coordinates of the target area of the current scanning are obtained.
Optionally, the management unit is further configured to, when the current scanning is a first scanning in a scanning period, scan in a basic direction to determine a touch area of the first scanning, and use the touch area as a target area in a next scanning direction. .
According to the infrared touch control equipment provided by the embodiment of the invention, the overlapped area between the target area and the touch area is used as the target area for next scanning, and the scanning range is calculated based on the target area for next scanning, namely, the scanning range is not calculated according to the fixed target area but updated according to the touch area scanned last time, so that the scanning range in the embodiment of the invention is more accurate, and compared with the prior art, the scanning time consumption is reduced
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the embodiments of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the embodiments of the present invention should be included in the scope of the present invention.
Claims (4)
1. An infrared touch screen scanning method is applied to an infrared touch device comprising an infrared touch screen, the infrared touch device further comprises an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube and the infrared receiving tube are used for scanning touch points on the infrared touch screen, and the scanning method in at least one scanning direction in one scanning period comprises the following steps:
Determining a target area, wherein the target area is the area where the touch point is determined before the current scanning;
Determining a scanning range according to the vertex of the target area and the current scanning direction;
Scanning in the scanning range according to the scanning direction of the time to obtain a touch area where the touch point is located;
Determining an overlapping area between the target area and the touch area as a target area in a next scanning direction;
The determining the scanning range according to the vertex of the target area and the current scanning direction includes:
determining the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the vertex of the target area;
taking the area between the infrared lights emitted by the infrared emission tubes with the largest serial number and the smallest serial number in the serial numbers of the infrared emission tubes as the scanning range;
The determining the infrared transmitting tube serial number which transmits the infrared light in the scanning direction and passes through the vertex of the scanned target area comprises the following steps:
determining the infrared transmitting tube serial number which transmits infrared light in the scanning direction and passes through the vertex of the target area in a preset list, wherein the preset list is used for indicating the corresponding relation among the scanning direction, the point through which the transmitted infrared light passes and the infrared transmitting tube serial number when scanning according to different scanning directions;
Or according to the formula m ═ (k)0*x0–y0)/k0Determining the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the vertex of the target area;
wherein m is the determined serial number of the infrared transmitting tube, and k is0the slope of the infrared light emitted according to the current scanning direction is (x)0，y0) Is the vertex coordinate of the target area.
2. The method according to claim 1, wherein when the current scan is the first scan in the scan cycle, the method further comprises:
and scanning in the basic direction to determine a touch area scanned for the first time, and taking the touch area as a target area in the next scanning direction.
3. The utility model provides an infrared touch equipment, its characterized in that, infrared touch equipment includes infrared touch screen, infrared touch equipment still includes infrared transmitting tube and infrared receiving tube, is used for right touch point on the infrared touch screen scans, infrared touch equipment still includes:
a management unit for determining a target area; determining a scanning range according to the peak of the target area and the current scanning direction, wherein the target area is the area where the touch point is determined before the current scanning;
The scanning unit is used for scanning in the scanning range determined by the management unit according to the scanning direction of the time to obtain a touch area where the touch point is located;
the management unit is further configured to determine an overlapping area between the target area and the touch area as a target area in a next scanning direction;
The management unit is also used for determining the infrared transmitting tube serial number which transmits infrared light in the scanning direction and the infrared light passes through the vertex of the target area;
Taking the area between the infrared lights emitted by the infrared emission tubes with the largest serial number and the smallest serial number in the serial numbers of the infrared emission tubes as the scanning range;
The management unit is further configured to determine, in a preset list, an infrared emission tube serial number through which the infrared light passes through a vertex of the target area, where the infrared light is emitted in the current scanning direction, and the preset list is used to indicate a correspondence relationship among the scanning direction, a point through which the emitted infrared light passes, and the infrared emission tube serial number when scanning is performed in different scanning directions;
Or, the management unit is further configured to obtain (k) according to the formula m ═ k0*x0–y0)/k0determining the serial number of an infrared transmitting tube which transmits infrared light in the scanning direction and the infrared light passes through the vertex of the target area;
Wherein m is the determined serial number of the infrared transmitting tube, and k is0The slope of the infrared light emitted according to the current scanning direction is (x)0，y0) Is the vertex coordinate of the target area.
4. The apparatus of claim 3,
And the management unit is further configured to, when the current scanning is a first scanning in a scanning period, scan in a basic direction to determine a touch area of the first scanning, and use the touch area as a target area in a next scanning direction.
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| CN106775135B (en) * | 2016-11-14 | 2020-06-09 | 海信视像科技股份有限公司 | Method and device for positioning touch point on infrared touch device and terminal equipment |
| CN107831953B (en) * | 2017-12-14 | 2021-02-26 | 海信视像科技股份有限公司 | Infrared touch screen scanning method and device and infrared touch equipment |
| CN114415853A (en) * | 2021-12-08 | 2022-04-29 | 深圳市鸿合创新信息技术有限责任公司 | Touch point position determining method and device and electronic equipment |
| CN116301416B (en) * | 2022-07-30 | 2023-11-14 | 荣耀终端有限公司 | Touch scanning method, touch screen and electronic equipment |
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