CN113126827B - Touch identification method of touch display device and related equipment - Google Patents
Touch identification method of touch display device and related equipment Download PDFInfo
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- CN113126827B CN113126827B CN201911418762.2A CN201911418762A CN113126827B CN 113126827 B CN113126827 B CN 113126827B CN 201911418762 A CN201911418762 A CN 201911418762A CN 113126827 B CN113126827 B CN 113126827B
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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
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
The invention discloses a touch identification method of a touch display device and related equipment, wherein the touch display device comprises the following steps: a display panel for image display; the infrared emission element is arranged on the first side and the second side adjacent to the display panel and is used for emitting infrared rays in different scanning directions; the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions; the processor is electrically connected with the infrared transmitting element and the infrared receiving element; the touch identification method provided by the invention determines the initial target area by selecting the reference direction, can greatly reduce the calculation quantity of the touch areas, and screens out the effective target area in the initial target area before determining the position of the touch point, so that the touch area where the interference touch point is positioned can be eliminated, the operation speed of the touch point can be increased, and the response speed and the operation experience of the touch display device can be improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a touch recognition method and related device for a touch display device.
Background
The touch screen, also known as a touch screen or a touch display device, is used as a display device with a touch function, gives multimedia a brand-new appearance, and is widely applied to the fields of inquiry of public information, industrial control, military command, electronic games, multimedia teaching and the like.
Touch screens can be classified into infrared type, resistive type, surface acoustic wave type, and capacitive type touch screens according to different types of sensors. The infrared touch technology has the advantages of strong environmental adaptability, long service life, more identifiable touch points and the like. The basic structure of the infrared touch screen is that a plurality of infrared transmitting elements and infrared receiving elements are arranged around a touch detection area, and infrared light emitted by the infrared transmitting elements is received by the infrared receiving elements positioned opposite to the infrared transmitting elements.
At present, a method for determining positions of touch points for an infrared touch screen is to sequentially intersect light paths shielded by a touch object, calculate a plurality of candidate touch points, and remove false points in the candidate touch points through an algorithm, thereby screening out the positions of real touch points. The scheme needs to intersect and calculate points for all the rays, and the operation period is long. And a large amount of touch false points are generated during calculation, so that the calculation efficiency is not high.
Disclosure of Invention
The invention provides a touch identification method of a touch display device and related equipment, which are used for improving the operation efficiency of touch detection.
In a first aspect, the present invention provides a touch identification method for a touch display device, where the touch display device includes:
a display panel for image display;
the infrared emitting elements are arranged on the adjacent first side and second side of the display panel and used for emitting infrared rays in different scanning directions;
the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions;
the processor is electrically connected with the infrared transmitting element and the infrared receiving element;
the touch identification method comprises the following steps:
when touch operation occurs, determining a touch area according to the infrared signal received by the infrared receiving element; the touch area is an area where a blocked light path is located in the same scanning direction;
determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction;
enlarging the boundary of the touch areas in the reference direction of the first side and the second side to form an expanded touch area, wherein the expanded touch areas intersect to divide an initial target area;
screening out an effective target area from the initial target area;
and determining the position of the touch point according to the effective target area and the positions of the touch areas formed in other scanning directions except the reference direction.
In one possible implementation manner, in the method provided by the present invention, the determining the reference directions of the first side and the second side according to the number of touch areas formed by the first side and the second side in each scanning direction respectively includes:
taking a scanning direction in which a touch area formed on the first side is the largest as a reference direction of the first side;
and taking the scanning direction with the largest touch control area formed on the second side edge as the reference direction of the second side edge.
In one possible implementation manner, in the method provided by the present invention, the enlarging a boundary of the touch area in the reference direction of the first side and the second side to form an expanded touch area includes:
and respectively expanding the distance of one infrared ray to two sides of the touch area generated in the reference direction of the first side edge and the second side edge to form an expanded touch area.
In a possible implementation manner, in the method provided by the present invention, the intersecting of the outer touch areas divides an initial target area, including:
intersecting every two of the external expansion touch areas;
and taking an overlapped area generated by the intersection of the two outward-extending touch areas as an initial target area.
In a possible implementation manner, in the foregoing method provided by the present invention, the screening out an effective target area from the initial target area includes:
sequentially intersecting the initial target area with touch areas formed in other scanning directions except the reference direction;
and if the intersection of the initial target area and the touch area has a part which is not overlapped with the intersection of other initial target areas and the touch area, determining the initial target area as an effective target area.
In a possible implementation manner, in the method provided by the present invention, the determining the position of the touch point according to the positions of the effective target area and a touch area formed in a scanning direction other than the reference direction includes:
intersecting the effective target region with a touch region formed in a scanning direction other than the reference direction;
and determining the position of the intersection of the effective target area and the touch areas formed in other scanning directions except the reference direction as the position of the touch point in the effective target area.
In a possible implementation manner, in the foregoing method provided by the present invention, the method further includes:
performing track tracking and smoothing processing on the determined touch points;
performing coordinate conversion on the touch points subjected to the track tracking and smoothing;
and outputting the coordinates of the touch points.
In one possible implementation, the present invention provides the above method, wherein the number of the scanning directions of the infrared emission elements is 30-60.
In a second aspect, the present invention provides a touch display device, including:
a display panel for image display;
the infrared emitting elements are arranged on the adjacent first side and second side of the display panel and used for emitting infrared rays in different scanning directions;
the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions;
the processor is electrically connected with the infrared transmitting element and the infrared receiving element and used for determining a touch area according to an infrared signal received by the infrared receiving element when touch operation occurs; determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction; enlarging the boundary of the touch areas in the reference direction of the first side and the second side to form an expanded touch area, wherein the expanded touch areas intersect to divide an initial target area; screening out an effective target area from the initial target area; determining the position of the touch point according to the effective target area and the positions of touch areas formed in other scanning directions except the reference direction;
the touch area is an area where a blocked light path is located in the same scanning direction.
In a third aspect, the present invention provides a readable storage medium storing executable instructions for performing any of the above methods.
The invention has the following beneficial effects:
the invention provides a touch identification method of a touch display device and related equipment, wherein the touch display device comprises: a display panel for image display; the infrared emitting element is arranged on the adjacent first side and second side of the display panel and used for emitting infrared rays in different scanning directions; the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions; the processor is electrically connected with the infrared transmitting element and the infrared receiving element; the touch identification method comprises the following steps: when a touch operation occurs when a touch object touches the display panel, determining a touch area according to the infrared signal received by the infrared receiving element; the touch area is an area where the blocked light path is located in the same scanning direction; determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction; enlarging the boundary of the touch areas in the reference direction of the first side edge and the second side edge to form an expanded touch area, and intersecting and dividing the expanded touch areas into an initial target area; screening an effective target area from the initial target area; and determining the position of the touch point according to the effective target area and the positions of the touch areas formed in other scanning directions except the reference direction. According to the touch identification method provided by the invention, the first side edge of the display panel and the reference direction of the first side edge are selected, the touch area in the reference direction is expanded towards two sides, the touch point is ensured to be positioned in the expanded touch area, the initial target areas are divided according to the expanded touch area, the effective target areas are firstly screened out from the initial target areas, and the position of the touch point is determined. According to the method and the device, the initial target area is determined by selecting the reference direction, the calculation quantity of the touch areas can be greatly reduced, and the effective target area is screened out in the initial target area before the position of the touch point is determined, so that the touch area where the interference touch point is located can be eliminated, the operation speed of the touch point can be increased, and the response speed and the operation experience of the touch display device are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a touch display device according to an embodiment of the invention;
fig. 3 is a flowchart of a touch recognition method of a touch display device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a touch scene according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the blocking of the infrared light in the scanning direction a1 of the first side s1 in FIG. 4;
FIG. 6 is a schematic diagram illustrating the blockage of the infrared light in the scanning direction a2 of the first side s1 in FIG. 4;
FIG. 7 is a schematic diagram illustrating the occlusion of the infrared light in the scanning direction b1 of the second side s2 in FIG. 4;
FIG. 8 is a schematic diagram illustrating the occlusion of the infrared light in the scanning direction b2 of the second side s2 in FIG. 4;
FIG. 9 is a schematic view of the flared-out touch area formed in the reference direction of FIG. 4;
FIG. 10 is a schematic view of an initial target area formed by the outer touch area of FIG. 9;
FIG. 11 is a schematic view of the initial target area of FIG. 10 with other touch areas other than the reference direction;
FIG. 12 is a schematic view of the initial target area X1 and other touch areas except for the reference direction;
fig. 13 is a schematic view of the initial target area X2 and other touch areas other than the reference direction;
fig. 14 is a schematic view of the initial target area X3 and other touch areas other than the reference direction;
fig. 15 is a schematic view of the initial target area X4 and other touch areas other than the reference direction;
FIG. 16 is a schematic diagram illustrating the location of a touch point within the effective target area X1;
fig. 17 is a schematic diagram illustrating the position of the touch point in the effective target area X4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The touch display device provided by the embodiment of the invention is an infrared touch display device, an infrared transmitting and receiving sensing element is usually arranged on an outer frame of a display panel of the infrared touch display device, an infrared detection net is formed on the surface of a screen, and when any touch object blocks infrared rays between the infrared transmitting element and the infrared receiving sensing element, a receiving signal drops sharply, so that the touch object can be detected. The infrared touch technology has the advantages of high stability, strong adaptability, long service life and the like, and is widely applied to the field of display.
Fig. 1 and fig. 2 are schematic structural diagrams of a touch display device according to an embodiment of the present invention, and as shown in fig. 1 and fig. 2, the touch display device according to the embodiment of the present invention includes:
a display panel 100 for displaying an image.
The display panel 100 may be a liquid crystal display panel, an organic light emitting diode display panel, or an electronic book, and is not limited herein. The display panel 100 is used for image display and is independent of the infrared touch system.
The infrared emitting element 21 is arranged on the first side s1 and the second side s2 adjacent to the display panel and is used for emitting infrared rays in different scanning directions; the infrared receiving element 22 is disposed on the side of the display panel opposite to the infrared emitting element, and is used for receiving infrared light from different directions.
In practical applications, the display panel 100 is a rectangular panel, so that the infrared emitting element 21 can be disposed on one long side and one short side of the display panel, and the infrared receiving elements can be disposed on the other two sides, thereby forming a two-dimensional infrared light net on the display panel. As shown in fig. 1, the positions of the infrared emitting elements 21 and the infrared receiving elements 22 correspond to each other, and all the infrared rays emitted from one infrared emitting element 21 in the same scanning direction are received by the uniquely corresponding infrared receiving element 22.
With the continuous development of touch technology, a smaller number of infrared elements are adopted, and a trend of achieving higher detection accuracy is a development trend, in order to fully utilize a limited number of infrared emitting elements 21 and infrared receiving elements 22, as shown in fig. 2, the infrared emitting elements 21 in the embodiment of the present invention can emit infrared rays in different scanning directions, as can be seen from fig. 2, when the emitting direction of the infrared rays emitted by the infrared emitting elements 21 is changed, the corresponding infrared receiving elements 22 are also changed, but each infrared emitting element 21 has a unique infrared receiving element 22 corresponding thereto in the same scanning direction.
The processor 300 is electrically connected to the infrared emitting device 21 and the infrared receiving device 22.
The processor 300 may be electrically connected to each of the infrared emitting element 21 and the infrared receiving element 22, and is configured to control a scanning direction of the infrared emitting element 21, and simultaneously receive an infrared signal detected by the infrared receiving element 22, and the processor 300 further has a data processing capability, and may perform an operation on the infrared signal received by the infrared receiving element 22 in different scanning directions, so as to finally determine a position of a touch point.
Based on the touch display device, an embodiment of the invention provides a touch identification method, and fig. 3 is a flowchart of the touch identification method provided by the embodiment of the invention, as shown in fig. 3, the touch identification method includes:
s10, when a touch operation occurs, determining a touch area according to the infrared signal received by the infrared receiving element;
s20, determining reference directions of the first side and the second side according to the number of touch areas formed by the first side and the second side in each scanning direction;
s30, enlarging the boundaries of the touch areas on the reference directions of the first side edge and the second side edge to form outward-extended touch areas, and intersecting the outward-extended touch areas to divide an initial target area;
s40, screening out an effective target area from the initial target area;
and S50, determining the position of the touch point according to the positions of the effective target area and the touch area formed in the other scanning directions except the reference direction.
The touch area is an area where the blocked light path is located in the same scanning direction.
According to the touch identification method provided by the embodiment of the invention, the first side edge of the display panel and the reference direction of the first side edge are selected, the touch area in the reference direction is expanded towards two sides, the touch point is ensured to be positioned in the expanded touch area, so that the initial target areas are divided according to the expanded touch area, the effective target areas are firstly screened out from the initial target areas, and the position of the touch point is determined. In the embodiment of the invention, the initial target area is determined by selecting the reference direction, the calculation quantity of the touch areas can be greatly reduced, and the effective target area is screened out in the initial target area before the position of the touch point is determined, so that the touch area where the interference touch point is located can be eliminated, the operation speed of the touch point can be increased, and the response speed and the operation experience of the touch display device can be improved.
The following describes an implementation of the touch recognition method according to an embodiment of the present invention. In the embodiment of the present invention, the first side s1 and the second side s2 respectively have two scanning directions as an example, and the touch recognition method provided in the embodiment of the present invention is exemplified.
Fig. 4 is a schematic view of a touch scene provided in an embodiment of the invention, and as shown in fig. 4, the infrared emitting elements are located on the first side s1 and the second side s2 of the display panel, the infrared emitting element on the first side s1 can emit infrared rays in two scanning directions, and the infrared emitting element on the second side s2 can emit infrared rays in two scanning directions. Wherein the scanning light lines are indicated by arrowed lines in fig. 4. When two touch objects are touched, infrared light rays in the infrared optical network can be shielded, wherein the light rays shielded by the touch objects are represented by dotted lines, and the light rays not shielded by the touch objects are represented by solid lines.
Fig. 5 and fig. 6 are schematic diagrams illustrating the shielding of the infrared light in the two scanning directions a1 and a2 of the first side s1 in fig. 4, respectively, as shown in fig. 5, the touch object can shield part of the infrared light in the scanning direction a1, and the infrared light shielded by the touch object can be divided into two regions by taking the unshielded infrared light as a limit. In the embodiment of the invention, the area where continuous light rays shielded in the same scanning direction are located is divided into one touch area. Then, there are two touch areas in the scanning direction a 1. As shown in fig. 6, a touching object also produces two touch areas in the scan direction a 2.
Fig. 7 and 8 are schematic diagrams illustrating the blocking of infrared light rays in two scanning directions b1 and b2 of the second side edge s2 in fig. 4, respectively, and as shown in fig. 7, a touch object generates two touch regions in the scanning direction b 1. As shown in fig. 8, a touching object produces only one touch area in the scan direction b 2.
In practical implementation, the first side s1 and the second side s2 respectively perform the infrared scanning operation, and the infrared emitting elements each perform the emission of infrared light in the same scanning direction in one scanning cycle. When the first side s1 has performed the scanning in all the scanning directions, the second side s2 starts to perform the scanning operation again. One scanning cycle is completed when the first side s1 and the second side s2 perform scanning in all scanning directions.
In step S20, determining the reference directions of the first side and the second side according to the number of touch areas formed by the first side and the second side in each scanning direction may include:
taking the scanning direction with the largest number of touch areas formed on the first side edge as the reference direction of the first side edge;
and taking the scanning direction with the largest touch control area formed on the second side edge as the reference direction of the second side edge.
In the prior art, after touch areas generated by a touch object in each scanning direction are determined, the position of a touch point is determined according to the intersection of the touch areas, and obviously, calculation for all the touch areas is huge, and the calculation efficiency is low. According to the touch identification method provided by the embodiment of the invention, the reference direction is determined firstly, and the position of the touch point is determined by processing the touch area generated in the reference direction, so that the calculation amount can be greatly reduced, and the calculation efficiency is improved.
According to the embodiment of the invention, only one scanning direction acting reference direction is selected on each side edge of the two side edges where the infrared emission elements are located. Specifically, for the first side s1, the scanning direction in which the touch area formed on the first side s1 is the largest may be taken as the reference direction of the first side s 1; for the second side edge s2, the scanning direction in which the touch area formed on the second side edge s2 is the largest may be taken as the reference direction of the second side edge s 2.
Still taking the touch scenario shown in fig. 4 as an example, two touch regions are formed in the scanning direction a1 of the first side s1, and two touch regions are also formed in the scanning direction a2 of the first side s1, and then either one of the two scanning directions can be taken as the scanning direction of the first side s 1. Two touch areas are formed in the scanning direction b1 of the second side edge s2, and only one touch area is formed in the scanning direction b2 of the second side edge s2, then the scanning direction b1 is taken as the scanning direction of the second side edge s 2.
The more touch areas formed in the same scanning direction, the higher the resolution of the scanning direction, and the scanning direction with the highest resolution is taken as the reference direction in the embodiment of the invention, so that the condition of missing touch points can be avoided.
Further, in step S30, enlarging the boundary of the touch area in the reference direction of the first side and the second side to form an expanded touch area includes:
and respectively expanding the distance of one infrared ray to two sides of the touch area generated in the reference direction of the first side edge and the second side edge to form an expanded touch area.
As shown in fig. 5 and 7, in the touch region formed in the reference direction a1 of the first side edge s1 and the touch region formed in the reference direction b1 of the second side edge s2, the boundary of the touch object is larger than the boundary of the touch region, because the touch object is not large enough to block the infrared rays on both sides of the touch region, so that the touch regions as shown in fig. 5 and 7 are formed, but the formed touch regions cannot completely enclose the touch object therein, so that the embodiment of the present invention expands the touch regions formed in the reference direction by the distance of one infrared ray to both sides, respectively, to form an expanded touch region, to ensure that the touch object can be completely located in the expanded touch region, thereby avoiding operation errors due to incomplete positioning.
Still taking the touch scene shown in fig. 4 as an example, fig. 9 is a schematic diagram of the outward-extended touch regions formed in the reference direction in fig. 4, and as shown in fig. 9, the two touch regions are respectively extended to both sides by the distance of one infrared ray in the reference direction a1 of the first side s1 to form two outward-extended touch regions shown in fig. 9; the two touch regions are respectively expanded to both sides by the distance of one infrared ray in the reference direction b1 of the second side edge s2 to form two expanded touch regions as shown in fig. 9.
Further, in the above step S30, the intersection of the extended touch areas defines an initial target area, which includes:
intersecting every two of the external extended touch areas;
and taking an overlapped area generated by the intersection of the two outward-extending touch areas as an initial target area.
And touch points may exist in the intersection of every two external touch areas outside the determined external touch areas. Therefore, the overlapping area generated by the intersection of the extended touch areas is used as the initial target area.
Still taking the touch scene shown in fig. 4 as an example, fig. 10 is a schematic diagram of an initial target area formed by the extra touch areas in fig. 9, and as shown in fig. 10, intersecting the four extra touch areas formed in the two reference directions a1 and b1 formed in fig. 9 will form four initial target areas X1-X4 shown in fig. 10, and the touch points generated by the touch operation are located in the initial target areas X1-X4.
Further, in the step S40, the step of screening out the effective target area from the initial target area includes:
sequentially intersecting the initial target area with touch areas formed in other scanning directions except the reference direction;
and if the intersection of the initial target area and the touch area has a part which is not overlapped with the intersections of other initial target areas and the touch area, determining the initial target area as an effective target area.
According to the embodiment of the invention, the initial target area is firstly screened, and the touch points are certainly present in the screened effective target area, so that the interference touch points can be removed, and the redundant calculation caused by the interference touch points is avoided.
The interference touch points are all caused by shielding of infrared light rays by the real touch points, but the set of infrared light rays shielded by the interference touch points is completely contained in the set of infrared light rays shielded by the real touch points, and the set of infrared light rays shielded by the real touch points is not necessarily completely contained in the set of infrared light rays shielded by the interference touch points.
The embodiment of the invention uses the above characteristics to sequentially intersect each initial target region with other touch regions except the reference direction to obtain the set of infrared rays blocked by each initial target region. Some infrared light is only blocked by one initial target area but not other initial target areas, so that the initial target area is a valid target area.
Illustrated as an initial target area in fig. 10. Fig. 11 is a schematic view of the initial target region and the other touch regions except the reference direction in fig. 10, and as shown in fig. 11, the scanning direction except the reference direction on the first side s1 is a2, and the scanning direction except the reference direction on the second side s2 is b 2. The initial target region X1-X4 has an optical path a blocked in the scanning direction a2 of the first side s1 21 -a 27 (ii) a The initial target region X1-X4 has a broken optical path b in the scanning direction b2 of the second side s2 21 -b 24 。
Fig. 12 to 15 are schematic views of the initial target areas X1 to X4 and other touch areas other than the reference direction, respectively. As shown in FIG. 12, the initial target area X1 has an optical path a in the scanning direction a2 21 -a 22 The initial target region X1 has a broken optical path b in the scanning direction b2 21 -b 23 (ii) a As shown in FIG. 13, the initial target area X2 has an optical path a in the scanning direction a2 26 The initial target region X2 has a broken optical path b in the scanning direction b2 21 -b 23 (ii) a As shown in FIG. 14, the initial target area X3 has an optical path a in the scanning direction a2 22 The initial target region X3 has a broken optical path b in the scanning direction b2 24 (ii) a As shown in FIG. 15, the initial target area X4 is being scannedThe optical path blocked in the direction a2 is a 26 -a 27 The initial target region X4 has a broken optical path b in the scanning direction b2 23 -b 24 。
It can be seen that the optical path a in the scanning direction a2 21 Is only shielded by the initial target region X1, the optical path a in the scanning direction a2 27 Only by the initial target area X4, except that the other optical paths in the scanning directions a2 and b2 are each blocked by at least two initial target areas. That is, the optical path a exists in the intersection of the initial target area X1 and the other touch areas other than the reference direction 21 Light path elements that do not belong in the intersection of the initial target area X2-X4 with other touch areas other than the reference direction; there is an optical path a in the intersection of the initial target area X4 with the other touch areas other than the reference direction 27 Light path elements that do not belong in the intersection of the initial target area X1-X3 with other touch areas other than the reference direction. It can thus be determined that the initial target areas X1 and X4 are valid target areas, and the touch points in the other initial target areas are interfering touch points.
Further, in the above step S50, determining the position of the touch point based on the positions of the effective target area and the touch area formed in the other scanning direction than the reference direction includes:
intersecting the effective target region with a touch region formed in a scanning direction other than the reference direction;
and determining the position of the intersection of the effective target area and the touch areas formed in other scanning directions except the reference direction as the position of the touch point in the effective target area.
After the effective target area is determined, the effective target area is intersected with other touch areas except the reference direction, and the position of the intersection is the position of the touch point.
Taking the effective target area determined in fig. 12-15 as an example, fig. 16 is a schematic diagram of the position of the touch point in the effective target area X1, as shown in fig. 16, the scanning direction of the first side edge s1 except the reference direction is a2, the scanning direction of the second side edge s2 except the reference direction is b2, and the position of the touch point in the effective target area X1 can be obtained by intersecting the effective target area X1 with the touch areas in the scanning directions a2 and b 2.
Fig. 17 is a schematic diagram illustrating the position of the touch point in the effective target area X4, where as shown in fig. 17, the scanning direction of the first side edge s1 except the reference direction is a2, the scanning direction of the second side edge s2 except the reference direction is b2, and the position of the touch point in the effective target area X4 can be obtained by intersecting the effective target area X4 with the touch areas in the scanning directions a2 and b 2.
In specific implementation, the touch recognition method provided in the embodiment of the present invention may further include:
performing track tracking and smoothing processing on the determined touch points;
performing coordinate conversion on the touch points subjected to track tracking and smoothing;
and outputting the coordinates of the touch points.
Specifically, after the position of the touch point is determined, the method provided by the embodiment of the present invention may further perform operations of trajectory tracking and smoothing on the touch point, so as to optimize the position of the touch point.
The trajectory tracking operation may be calculated by a distance optimal matching algorithm or a kalman predictive tracking algorithm. Taking the distance optimal matching algorithm as an example:
the scanning period of the touch screen is fixed, that is, the interval between every two periods is fixed, if the scanning period is set as unit time t, according to the relationship among the uniform variable speed movement distance s, the speed v and the acceleration a, there are:
v t ＝v 0 +at；
the velocity v can be calculated according to the coordinates of the touch points in two consecutive periods, the acceleration a can be calculated according to the coordinates of the touch points in three consecutive periods, and in several consecutive scanning periods, if the motion of the touch points is assumed to be a uniform variable speed linear motion, the coordinate position of the touch point in the next scanning period can be predicted according to the distance formula. After the coordinates of the touch points are determined according to the method of the embodiment of the invention in the next scanning period, track tracking is sequentially performed by searching for the predicted touch point closest to the real touch point for matching.
In addition, the track smoothing process may adopt five-point cubic smoothing, polynomial fitting smoothing algorithm, and the like, which is not limited herein.
And performing coordinate conversion on the touch points subjected to the track tracking and smoothing, wherein the coordinate system can be a coordinate system in a display surface of the display panel, and outputting the coordinates after the coordinates of the touch points are obtained to obtain the coordinate positions of the touch points.
In practical applications, the emission angle of the infrared emission element 21 provided by the embodiment of the present invention can reach 120 to 140 °, and 30 to 60 scanning directions can be provided. In the embodiment of the present invention, only two scanning directions exist on the first side s1 and the second side s2, which are taken as an example to explain a specific process of the touch recognition method provided in the embodiment of the present invention, when the scanning directions on the first side s1 or the second side s2 are increased to 30-60, the positions of the touch points can still be detected by the above method. The touch identification method provided by the embodiment of the invention can be applied to a single-point touch or multi-point touch scheme, and can track the moving track according to the position of the detected touch point, so that the aim of detecting the painting or the writing trace on the touch display device is fulfilled.
Based on the same inventive concept, an embodiment of the present invention further provides a touch display device, where the touch display device can implement any one of the above touch identification methods, as shown in fig. 1, the touch display device provided in the embodiment of the present invention includes:
a display panel 100 for image display;
the infrared emitting element 21 is disposed on the first side s1 and the second side s2 adjacent to the display panel 100, and is configured to emit infrared rays in different scanning directions;
an infrared receiving element 22 disposed on the side of the display panel 100 opposite to the infrared emitting element 21 for receiving infrared light from different directions;
the processor 300 is electrically connected with the infrared transmitting element 21 and the infrared receiving element 22, and the processor 300 is used for determining a touch area according to an infrared signal received by the infrared receiving element 22 when a touch operation occurs; determining reference directions of the first side s1 and the second side s2 according to the number of touch areas formed by the first side s1 and the second side s2 in each scanning direction, respectively; enlarging the boundaries of the touch areas in the reference direction of the first side s1 and the second side s2 to form outward-extended touch areas, wherein the outward-extended touch areas intersect to divide an initial target area; screening an effective target area from the initial target area; determining the position of a touch point according to the effective target area and the positions of touch areas formed in other scanning directions except the reference direction;
the touch area is an area where the blocked light path is located in the same scanning direction.
In the touch display device provided in the embodiment of the present invention, the processor may select the first side of the display panel and the reference direction of the first side, and extend the touch area in the reference direction to both sides to ensure that the touch point is located in the extended touch area, so as to divide the initial target area according to the extended touch area, and select the effective target area in the initial target areas first, thereby determining the position of the touch point. In the embodiment of the invention, the initial target area is determined by selecting the reference direction, the calculation quantity of the touch areas can be greatly reduced, and the effective target area is screened out in the initial target area before the position of the touch point is determined, so that the touch area where the interference touch point is located can be eliminated, the operation speed of the touch point can be increased, and the response speed and the operation experience of the touch display device can be improved.
Optionally, the processor 300 is specifically configured to use a scanning direction in which the touch area formed on the first side is the largest as a reference direction of the first side; and taking the scanning direction with the largest touch control area formed on the second side edge as the reference direction of the second side edge.
According to the embodiment of the invention, the reference direction is determined first, and the position of the touch point is determined by processing the touch area generated in the reference direction, so that the calculation amount can be greatly reduced, and the calculation efficiency is improved.
Optionally, the processor 300 is specifically configured to expand the touch areas generated in the reference directions of the first side and the second side by a distance of one infrared ray to both sides to form an expanded touch area.
According to the embodiment of the invention, the distance of one infrared ray is respectively expanded to two sides of the touch area formed in the reference direction to form the extended touch area, so that the touch object can be completely positioned in the extended touch area, and the operation error caused by incomplete positioning is avoided.
Optionally, the processor 300 is specifically configured to intersect each of the outward-extending touch areas pairwise; and taking an overlapped area generated by the intersection of the two outward-extending touch areas as an initial target area.
And outside the determined external extended touch area, touch points may exist in the intersection of every two external extended touch areas. Therefore, the overlapped area generated by the intersection of the extended touch areas is used as the initial target area.
Optionally, the processor 300 is specifically configured to sequentially intersect the initial target area with touch areas formed in other scanning directions except the reference direction; and if the intersection of the initial target area and the touch area has a part which is not overlapped with the intersections of other initial target areas and the touch area, determining the initial target area as an effective target area.
According to the embodiment of the invention, the initial target area is firstly screened, and the touch points are certainly present in the screened effective target area, so that the interference touch points can be removed, and the redundant calculation caused by the interference touch points is avoided.
The interference touch points are caused by the fact that the real touch points shield the infrared light, but the set of infrared light shielded by the interference touch points is completely contained in the set of infrared light shielded by the real touch points, and the set of infrared light shielded by the real touch points is not necessarily completely contained in the set of infrared light shielded by the interference touch points.
The embodiment of the invention uses the above characteristics to sequentially intersect each initial target region with other touch regions except the reference direction to obtain the set of infrared rays blocked by each initial target region. Some infrared light is only blocked by one initial target area but not other initial target areas, so that the initial target area is a valid target area.
Optionally, the processor 300 is specifically configured to intersect the effective target area with a touch area formed in a scanning direction other than the reference direction; and determining the position of the intersection of the effective target area and the touch areas formed in other scanning directions except the reference direction as the position of the touch point in the effective target area.
After the effective target area is determined, the effective target area is intersected with other touch areas except the reference direction, and the position of the intersection is the position of the touch point.
Optionally, the processor 300 is further configured to perform trajectory tracking and smoothing on the determined touch point; performing coordinate conversion on the touch points subjected to track tracking and smoothing; and outputting the coordinates of the touch points.
In practical applications, the emission angle of the infrared emission element 21 provided by the embodiment of the present invention can reach 120 to 140 °, and 30 to 60 scanning directions can be provided. The above-described processing may be performed for the touch areas generated on the first side s1 and the second side s2, so as to determine the position of the touch point.
The embodiment of the invention also provides a readable storage medium, wherein the readable storage medium stores executable instructions, and the executable instructions are used for executing any touch identification method.
The embodiment of the invention provides a touch identification method and related equipment of a touch display device, wherein the touch display device comprises the following steps: a display panel for image display; the infrared emitting element is arranged on the adjacent first side and second side of the display panel and used for emitting infrared rays in different scanning directions; the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions; the processor is electrically connected with the infrared transmitting element and the infrared receiving element; the touch identification method comprises the following steps: when a touch operation occurs when a touch object touches the display panel, determining a touch area according to an infrared signal received by the infrared receiving element; the touch area is an area where the blocked light path is located in the same scanning direction; determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction; enlarging the boundary of the touch areas in the reference direction of the first side edge and the second side edge to form an expanded touch area, and intersecting and dividing the expanded touch areas into an initial target area; screening an effective target area from the initial target area; and determining the position of the touch point according to the effective target area and the positions of the touch areas formed in other scanning directions except the reference direction. According to the touch identification method provided by the invention, the first side edge of the display panel and the reference direction of the first side edge are selected, the touch area in the reference direction is expanded towards two sides, the touch point is ensured to be positioned in the expanded touch area, the initial target areas are divided according to the expanded touch area, the effective target areas are firstly screened out from the initial target areas, and the position of the touch point is determined. According to the method and the device, the initial target area is determined by selecting the reference direction, the calculation quantity of the touch areas can be greatly reduced, and the effective target area is screened out in the initial target area before the position of the touch point is determined, so that the touch area where the interference touch point is located can be eliminated, the operation speed of the touch point can be increased, and the response speed and the operation experience of the touch display device are improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A touch identification method of a touch display device is characterized in that the touch display device comprises:
a display panel for image display;
the infrared emission elements are arranged on the first side edge and the second side edge of the display panel, and are used for emitting infrared rays in different scanning directions;
the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions;
the processor is electrically connected with the infrared transmitting element and the infrared receiving element;
the touch identification method comprises the following steps:
when touch operation occurs, determining a touch area according to the infrared signal received by the infrared receiving element; the touch area is an area where a blocked light path is located in the same scanning direction;
determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction;
enlarging the boundary of the touch areas in the reference direction of the first side and the second side to form an expanded touch area, wherein the expanded touch areas intersect to divide an initial target area;
screening out an effective target area from the initial target area;
determining the position of a touch point according to the effective target area and the positions of touch areas formed in other scanning directions except the reference direction;
wherein, the determining the reference directions of the first side edge and the second side edge respectively according to the number of the touch areas formed by the first side edge and the second side edge in each scanning direction includes:
taking a scanning direction in which a touch area formed on the first side is the largest as a reference direction of the first side;
taking the scanning direction with the largest touch control area formed on the second side edge as the reference direction of the second side edge;
the screening out an effective target area from the initial target area comprises:
sequentially intersecting the initial target area with touch areas formed in other scanning directions except the reference direction;
and if at least one optical path which only passes through the initial target area but does not pass through other initial target areas exists in the intersection of the initial target area and the touch areas formed in other scanning directions, determining the initial target area as an effective target area.
2. The method of claim 1, wherein the enlarging the boundary of the touch area in the reference direction of the first side and the second side forms an expanded touch area, comprising:
and respectively expanding the distance of one infrared ray to two sides of the touch area generated in the reference direction of the first side edge and the second side edge to form an expanded touch area.
3. The method of claim 1, wherein the intersection of each of the outward touching regions demarcates an initial target area comprising:
intersecting every two of the external expansion touch areas;
and taking an overlapped area generated by the intersection of the two outward-extending touch areas as an initial target area.
4. The method of claim 1, wherein determining the position of the touch point according to the positions of the effective target area and the touch area formed in the other scanning direction except the reference direction comprises:
intersecting the effective target region with a touch region formed in a scanning direction other than the reference direction;
and determining the position of the intersection of the effective target area and the touch areas formed in other scanning directions except the reference direction as the position of the touch point in the effective target area.
5. The method of claim 1, wherein the method further comprises:
performing track tracking and smoothing processing on the determined touch points;
performing coordinate conversion on the touch points subjected to track tracking and smoothing;
and outputting the coordinates of the touch points.
6. The method of any of claims 1-5, wherein the infrared-emitting elements have a scan direction of 30-60.
7. A touch display device, comprising:
a display panel for image display;
the infrared emitting elements are arranged on the adjacent first side and second side of the display panel and used for emitting infrared rays in different scanning directions;
the infrared receiving element is arranged on the side edge of the display panel opposite to the infrared emitting element and is used for receiving infrared rays from different directions;
the processor is electrically connected with the infrared transmitting element and the infrared receiving element and used for determining a touch area according to an infrared signal received by the infrared receiving element when touch operation occurs; determining reference directions of the first side edge and the second side edge respectively according to the number of touch areas formed by the first side edge and the second side edge in each scanning direction; enlarging the boundary of the touch areas in the reference direction of the first side and the second side to form an expanded touch area, wherein the expanded touch areas intersect to divide an initial target area; screening out an effective target area from the initial target area; determining the position of a touch point according to the effective target area and the positions of touch areas formed in other scanning directions except the reference direction;
the touch area is an area where a blocked light path is located in the same scanning direction;
the processor is specifically configured to use a scanning direction in which a touch area formed on the first side is the largest as a reference direction of the first side; taking the scanning direction with the largest touch area formed on the second side edge as the reference direction of the second side edge;
the processor is further specifically configured to sequentially intersect the initial target region with touch regions formed in other scanning directions other than the reference direction; and if at least one optical path which only passes through the initial target area but does not pass through other initial target areas exists in the intersection of the initial target area and the touch areas formed in other scanning directions, determining the initial target area as an effective target area.
8. A readable storage medium having stored thereon executable instructions for performing the method of any one of claims 1-6.
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