CN106383615B - Unilateral infrared touch device, touch identification method and device - Google Patents
Unilateral infrared touch device, touch identification method and device Download PDFInfo
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- CN106383615B CN106383615B CN201610802537.9A CN201610802537A CN106383615B CN 106383615 B CN106383615 B CN 106383615B CN 201610802537 A CN201610802537 A CN 201610802537A CN 106383615 B CN106383615 B CN 106383615B
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- 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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Abstract
In the unilateral infrared touch scheme provided in the embodiment of the application, in the unilateral infrared touch device, a plurality of infrared elements are arranged on one side in one direction, the plurality of infrared elements comprise infrared transmitting elements and infrared receiving elements which are arranged at intervals, a light path is determined by the central light of each infrared transmitting element for transmitting an infrared beam, and the plurality of infrared transmitting elements determine a plurality of parallel light paths; each infrared receiving element can receive the central light of the infrared light to determine at least one light path, wherein a plurality of infrared receiving elements determine a plurality of parallel light paths; therefore, the positions of the touch points are determined by the intersection points of the light paths respectively determined by the infrared transmitting element and the infrared receiving element, and the positions of the touch points can be determined by only arranging the infrared elements on a single side, so that the touch area is not limited by planes determined by four sides of a quadrangle and other three-side boundaries of a matrix, and the range of the touch area can be at least expanded in space.
Description
Technical Field
The invention relates to the technical field of touch control, in particular to a unilateral infrared touch control device, a touch control identification method and a device.
Background
The touch screen is an electronic system which can detect the existence of touch points and the positions of the touch points in a display area, and the touch screen simplifies a man-machine interaction method; among current touch technologies, the infrared touch technology has the advantages of strong environmental adaptability, longer service life, more recognizable touch points and the like and is widely applied.
In the prior art, the basic structure of an infrared touch screen is that a plurality of transmitting elements and infrared receiving elements are arranged around a touch detection area, wherein the infrared transmitting elements and the infrared receiving elements are in one-to-one correspondence to form an infrared transmitting and receiving pair, and infrared light emitted by the infrared transmitting elements is received by the infrared receiving elements positioned opposite to each other; whether a touch event occurs and the position of the touch point may be determined according to whether the infrared light is blocked. Fig. 1 is a schematic structural diagram of an infrared touch frame in an infrared touch screen in the related art. As shown in fig. 1, the infrared transmitting tubes 101 in the infrared touch frame are uniformly distributed on two adjacent sides of the display screen, and the infrared receiving tubes 102 are uniformly distributed on the other two adjacent sides of the display screen. When the infrared touch frame works, the infrared transmitting tube 101 transmits infrared rays to the infrared receiving tube 102 in real time, and the two groups of crossed infrared rays form an infrared optical network. When a user touches the display screen, the infrared rays at the corresponding positions are shielded, and the MCU positions the touch positions of the user according to the change of the received infrared rays.
Fig. 2 is a schematic structural diagram of an infrared touch system in the infrared touch screen in fig. 1. As shown in fig. 2, the infrared touch system 200 includes: the infrared touch system comprises an MCU201, a transmitting scanning circuit 202, a receiving scanning circuit 203, an infrared transmitting tube matrix 204, an infrared receiving tube matrix 205 and a sampling circuit 206.
The emission scanning circuit 202 is connected with the MCU201, and is configured to drive the infrared emission tubes in the infrared emission tube matrix 204 to emit infrared rays under the control of the MCU 201; the receiving scanning circuit 203 is connected with the MCU201 and is configured to drive the infrared receiving tubes in the infrared receiving tube matrix 205 to receive infrared rays under the control of the MCU 201; the sampling circuit 206 is connected to the infrared receiving tube matrix 205 and the MCU201, and configured to sample infrared rays received in the infrared receiving tube matrix 205 at preset time intervals under the control of the MCU201, and send a sampling signal to the MCU201 to enable the MCU201 to determine whether a touch operation of a user is received, so as to control the television set accordingly when the touch operation of the user is received.
The transmitting and scanning circuit 202 and the infrared transmitting tube matrix 204 may be collectively referred to as an infrared touch transmitting circuit, and the receiving and scanning circuit 203 and the infrared receiving tube matrix 205 may be collectively referred to as an infrared touch receiving circuit.
In the related art shown in fig. 1 and 2, the infrared touch screen is formed by disposing the transmitting or receiving infrared elements on four sides of the touch screen, and the inventor finds that the touch area is limited by the rectangular plane formed by the four-sided touch frame, and at least the defect that the touch function cannot be realized in the three-dimensional space exists.
Disclosure of Invention
The invention provides a novel unilateral infrared touch method, an infrared touch method and an infrared touch device.
In a first aspect, the present application provides a single-sided infrared touch device, comprising: the method comprises the steps that a plurality of infrared elements are arranged on one direction side, wherein the infrared elements comprise infrared transmitting elements and infrared receiving elements which are arranged at intervals, a light path is determined by taking the central light of infrared beams transmitted by each infrared transmitting element as a reference, and the infrared transmitting elements determine a plurality of parallel light paths; each infrared receiving element can receive the central light of the infrared light and determine at least one light path by taking the central light as a reference, wherein a plurality of infrared receiving elements determine a plurality of parallel light paths; and determining the position of a touch point according to intersection points between the light paths respectively determined by the infrared transmitting element and the infrared receiving element.
Optionally, the plurality of parallel light paths defined by the infrared emitting element are perpendicular to the direction side where the infrared element is located.
Optionally, the single-sided infrared touch device includes a control system, and the control system includes: the device comprises a control unit, a transmitting scanning circuit, a receiving scanning circuit, an infrared transmitting element, an infrared receiving element and a sampling circuit; the emission scanning circuit is connected with the control unit and used for driving the infrared emission element to emit infrared rays under the control of the control unit; the receiving scanning circuit is connected with the control unit and used for driving the infrared receiving element to receive infrared rays under the control of the control unit; the sampling circuit is respectively connected with the infrared receiving element and the control unit and used for sampling infrared light received by the infrared receiving element under the control of the control unit and sending a sampling signal to the control unit so that the control unit can determine whether a touch point exists in a touch identification range.
Optionally, the emission scanning circuit is specifically configured to scan the plurality of infrared emission elements in sequence in one scanning period; the receiving scanning circuit is specifically used for turning on the plurality of infrared receiving elements during the turning on period of one infrared emitting element; the sampling circuit is specifically used for sampling the plurality of infrared receiving elements respectively during the starting period of one infrared emitting element; and the control unit is specifically used for determining the existence and the position of the touch point according to the sampling signal obtained by the sampling circuit.
Optionally, the receiving and scanning circuit is specifically configured to sequentially scan and turn on the plurality of infrared receiving elements during a period in which one infrared emitting element is turned on.
Optionally, the receiving and scanning circuit is specifically configured to scan the plurality of infrared receiving elements in groups during one infrared transmitting element, so as to turn on all the plurality of infrared receiving elements.
In a second aspect, the present application further provides a touch recognition method applied to the one-sided infrared touch device of any one of the above claims, the touch recognition method includes: recording a first position of a currently scanned infrared emission unit in a scanning period; recording a second position of the infrared receiving unit with the received light intensity greater than the threshold value according to the sampling signal of each infrared receiving unit during the starting period of the infrared transmitting element; determining a first effective light path according to the first position, and determining at least one second effective light path according to the second position; and determining the coordinates of the intersection point of the optical path according to the optical path parameters of the first effective optical path and the at least one second effective optical path parameter.
Optionally, after the step of determining the light path intersection point coordinate according to the light path parameter of the first effective light path and the at least one second effective light path parameter, the touch recognition method further includes: and determining an effective touch point according to the determined light path intersection point coordinate.
Optionally, the optical path parameter includes a start boundary position coordinate and an end boundary position coordinate of the optical path, and angle information of the optical path or slope information of the optical path.
In a third aspect, in an implementation of the present application, a touch recognition method is further provided, where the touch recognition method includes: step 151, in a scanning period, initializing an effective light path set C; step 152, scanning the infrared emitting elements in sequence, and recording the opening of the ith emitting element by a counter, wherein 1< = i < = M, and M represents the number of the infrared emitting elements; step 153, sequentially determining whether the received light intensity in the infrared light receiving element is greater than the threshold, if yes, performing step 155, and if no, performing step 154; step 154, continuing to scan the infrared emission element, and the counter records that the (i + 1) th emission element is started, and then continuing to execute step 153; step 155, recording the jth infrared receiving element with the received light intensity greater than the threshold, wherein 1< = j < = N, and N represents the number of infrared receiving elements; step 156, recording the emitting optical path corresponding to the ith emitting element as an effective optical path, and the receiving optical path corresponding to the jth receiving element as an effective optical path, and adding 1 to the effective optical path pair C of the effective optical path set.
Optionally, repeating steps 151 to 156 until the traversal scanning of the M infrared emitting elements is completed; and then, respectively determining the position coordinates of the touch points according to the effective light path pairs in the scanning period.
In a fourth aspect, the present application provides a touch recognition device, including: the infrared emission scanning recording unit is used for recording a first position of the current scanning infrared emission unit in a scanning period; the infrared receiving scanning recording unit is used for recording a second position of the infrared receiving unit with the receiving light intensity larger than the threshold value according to the sampling signal of each infrared receiving unit during the starting period of one infrared emitting element; an effective light path determining unit, configured to determine a first effective light path according to the first position, and determine at least one second effective light path according to the second position; and the optical path intersection point coordinate determining unit is used for determining the optical path intersection point coordinate according to the optical path parameter of the first effective optical path and the at least one second effective optical path parameter.
Optionally, the touch recognition device further includes: the effective touch point determining unit 750 is configured to determine an effective touch point according to the determined light path intersection point coordinates.
In a fifth aspect, the present application further provides a touch recognition device, including: at least one processor, memory, peripheral interfaces, input/output subsystems, power lines, and communication lines; the memory comprises an operating system and a touch identification program, and the touch identification program is generated according to any one of the touch identification methods; the processor is configured to execute the touch recognition program.
In a sixth aspect, the present application provides a touch terminal device, including a device main body; the equipment main body comprises any one of the unilateral infrared touch devices and any one of the touch identification devices.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that:
in the unilateral infrared touch scheme provided in the embodiment of the application, in the unilateral infrared touch device, a plurality of infrared elements are arranged on one side in one direction, the plurality of infrared elements comprise infrared transmitting elements and infrared receiving elements which are arranged at intervals, a light path is determined by the central light of each infrared transmitting element for transmitting an infrared beam, and the plurality of infrared transmitting elements determine a plurality of parallel light paths; each infrared receiving element can receive the central light of the infrared light to determine at least one light path, wherein a plurality of infrared receiving elements determine a plurality of parallel light paths; therefore, the positions of the touch points are determined by the intersection points of the light paths respectively determined by the infrared transmitting element and the infrared receiving element, and the positions of the touch points can be determined by only arranging the infrared elements on a single side, so that the touch area is not limited by planes determined by four sides of a quadrangle and other three-side boundaries of a matrix, and the range of the touch area can be at least expanded in space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an infrared touch frame in an infrared touch screen in the related art;
FIG. 2 is a schematic structural diagram of an infrared touch system in the infrared touch screen of FIG. 1;
fig. 3 is a first schematic structural diagram of a single-sided infrared touch device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a single-sided infrared touch device according to an embodiment of the present disclosure;
fig. 5a is a first schematic light ray diagram of a single-sided infrared touch device in an embodiment of the present application;
fig. 5b is a schematic light ray diagram of a single-sided infrared touch device in the embodiment of the present application;
fig. 5c is a schematic light ray diagram of a single-sided infrared touch device in the embodiment of the present application;
fig. 6 is a light ray diagram of a single-sided infrared touch device in the embodiment of the present application;
fig. 7 is a fifth light ray schematic diagram of the single-sided infrared touch device in the embodiment of the present application;
FIG. 8a is a schematic diagram of an optical network for receiving positive and negative angle optical paths in an embodiment of the present application;
FIG. 8b is a schematic diagram of an optical network for receiving a negative angle optical path in an embodiment of the present application;
fig. 9 is a control system of a single-sided infrared touch device according to an embodiment of the present application;
FIG. 10 is a first schematic diagram of the optical path in the embodiment of the present application;
FIG. 11 is a first schematic diagram of the optical path in the embodiment of the present application;
fig. 12 is a schematic flowchart illustrating a touch recognition method according to an embodiment of the present disclosure;
fig. 13 is a flowchart illustrating a touch recognition method according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a touch recognition device provided in an embodiment of the present application;
fig. 15 is a schematic structural diagram of a touch recognition device in a terminal 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 clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Some preferred schemes or non-preferred schemes in the application have certain advantages and defects respectively in specific application scenes, the technology in the field can be selected and set according to the requirements of the specific application scenes, and the protection range of the application is not affected by the change.
As described in the background art, in the related art, the infrared touch screen of the four-side touch manner is formed by arranging the transmitting or receiving infrared elements on four sides, and a touch area of the infrared touch screen is limited by a rectangular plane formed by a four-side touch frame, so that the touch function cannot be expanded in a three-dimensional space. The touch control function can be realized only by arranging the infrared element on a single side, so that the touch control area is not limited by planes determined by four sides of a quadrangle and other three-side boundaries of a matrix, and the range of the touch control area can be expanded in space.
On one hand, a single-sided infrared touch device is provided in the embodiment of the present application, and fig. 3 is a schematic structural diagram of the single-sided infrared touch device provided in the embodiment of the present application, as shown in fig. 3, a plurality of infrared elements are disposed on one direction edge of the single-sided infrared touch device 300, wherein the plurality of infrared elements include an infrared emitting element 301 and an infrared receiving element 302 disposed at an interval. It should be noted that, in all the drawings of the embodiments of the present application, white represents an infrared light emitting element, such as: infrared light emitting tubes, and black represents infrared light receiving elements such as: an infrared light receiving tube.
It should be noted that the infrared emitting elements and the infrared receiving elements that are arranged at intervals are not limited to be arranged at intervals one by one in fig. 3, and a person skilled in the art may select a manner of arranging the infrared emitting elements and the infrared receiving elements at intervals in an implementation application scenario in consideration of specific factors such as the identified resolution, for example, in fig. 4, the single-sided infrared touch device 400 selects two infrared emitting elements 401 that are continuously arranged, and one infrared receiving element 402 that is arranged at intervals, which does not affect the implementation of the present invention.
In the embodiment of the application, in order to determine the existence and the position of a touch point by using a principle that two lines intersect to determine a point only in a touch scheme in which an infrared transmitting tube and an infrared receiving tube are arranged on a single side, at least two identification light paths need to exist on one touch point, and the intersection point of the at least two identification light paths is determined as the position of the touch point, so that the technical scheme of single-side touch can be realized.
In the structure of the unilateral infrared touch device in the embodiment of the application, at least two identification light paths exist for realizing one touch point. As shown in fig. 5a, a light path where the touch point is located is determined by the light emitted by the infrared emitting elements, and as a reference, a light path is determined by the central light of each infrared emitting element 301 emitting the infrared beam, wherein a plurality of parallel light paths are determined by the plurality of infrared emitting elements 301. Each infrared emitting element 301 determines an optical path, which is an area that can be covered by the light rays an emitted by the infrared emitting element 301, so that the touch point falling into the area can block the light rays of the infrared emitting element corresponding to the optical path, and the parallel optical path is surrounded by an initial boundary Ln and a termination boundary Ln + 1. As in fig. 5a, for example: an optical path defined by the first ir emitting element 301 is an area defined by a starting boundary L1 and an ending boundary L2 that extend to both sides with the principal ray a1 as the center, so that a touch point falling in the optical path can be determined by the ir emitting element emitting a ray an corresponding to the optical path.
In this embodiment, it is preferable that the plurality of parallel light paths defined by the infrared emitting elements are perpendicular to the direction side in which the infrared elements are located. Other possible implementation situations of this embodiment are not limited to this direction, and the parallel optical path in other angular directions may also be used; it should be further noted that, in an actual application scenario of this embodiment, due to design errors and process errors of the emission angle of the infrared emission element 301, or consideration of design requirements and other factors, small-amplitude deviations in the parallel angle may exist in the multiple parallel light paths, which does not hinder implementation of this application, and does not affect the actual protection range of this application.
In order to reduce the possibility of crossing of a plurality of infrared light beams emitted by a plurality of infrared emitting elements 301 in the touch recognition range, and the divergence angle of each infrared light emitting unit 301 for emitting the infrared light beam is as small as possible, for example, as shown in fig. 5b, each infrared light emitting unit 301 for emitting the infrared light beam may actually be formed by a series of light beams with the divergence angle phi, and in order to reduce the crossing of the plurality of infrared light beams, so as to reduce the recognition error possibility of the position of the touch point, the divergence angle phi of the infrared light beam is as small as possible.
In this embodiment, in order to reduce the divergence angle Φ of the infrared light beam, a collimating optical element may be disposed at the front end of the infrared light emitting unit 301, so as to converge the divergent light emitted from the infrared light emitting unit into a beam of parallel light, or reduce the light emitting area of the infrared light emitting unit 301 to shield the divergent light with a large angle.
Preferably, in the touch recognition range, there is no intersection between the directions of the emission beams of the respective infrared emission elements 301. The touch recognition range refers to a range of a preset touch recognizable area of the infrared touch device, and as will be understood by those skilled in the art, the recognizable area of each infrared touch device can be considered according to design, for example: the infrared emission tube has a limited emission and its recognizable area is limited.
On the contrary, if the emitted light beams intersect, the problem of erroneous determination of the touch point position may occur, as shown in fig. 5c, the light divergence angle of the first infrared emitting device 301a emitting the infrared light beam a1 is too large, and the light beam a1 is radiated to the light path corresponding to the second infrared emitting device 301b, so that the first infrared emitting device actually falls into the touch point a in the light path corresponding to the second infrared emitting device 301b, and the touch point a may block the light beam a1 to change the light direction thereof, so that the touch point a may be mistaken as the touch point in the light path corresponding to the first infrared emitting device 301a, and the position coordinate of the actual touch point a may be erroneously determined.
Of course, in practical applications, in other possible implementations, the possibility of the presence of emitted light of adjacent infrared emitting elements is not excluded. For example: the intersection point falls outside the touch identification range and does not affect the determination of the coordinate position of the actual touch point. And when the intersection point falls into the touch identification range, only some errors occur in the coordinate position of the touch point, the realization of the method is not hindered, and the actual protection range of the method is not influenced.
In the embodiment of the present application, the infrared receiving elements receive the light to determine at least another light path at the touch point, as shown in fig. 6, each infrared receiving element 302 may receive the central light in the infrared light range as a reference to determine at least one light path, wherein the plurality of infrared receiving elements 302 determine a plurality of parallel light paths. Similar to the optical path defined by the infrared emitting element, each infrared receiving element 302 defines a receiving optical path, which is centered on the central ray of the light beam receivable by the infrared receiving element 302 and extends to an area covered by the light beam receivable at both sides, and the area is surrounded by a start boundary and an end boundary to form a parallel optical path.
In the practical application scenario of this embodiment, in order to determine the existence and position of a touch point by using the principle of determining a point by intersecting two lines, when the infrared transmitting element 301 and the infrared receiving element 302 respectively determine that there is an intersection point between the optical paths within the touch recognition range, a person skilled in the art can select an angle of a better receiving optical path by controlling the receiving angle of the infrared receiving element 302.
The same as the emission light path determined by the infrared emission element 301, the infrared reception element 302 controls the divergence angle of the received light to be reduced as much as possible, and reduces the misjudgment rate of the position of the touch point. In this embodiment, in order to receive only light rays with a certain divergence angle phi range, an optical element may be disposed at the front end of the infrared light receiving unit 302, so that light rays with an incident angle exceeding the range are transmitted, refracted or reflected and cannot enter the infrared light receiving unit, so as to achieve the purpose of shielding large-angle incident light rays, and according to the needs of a specific practical application scenario, a person skilled in the art may also select other possible implementation manners in the prior art, which is not described in detail herein.
Further, in other possible implementations of the embodiment of the present application, in order to provide the touch recognition range of the single-sided infrared touch device, as shown in fig. 7, each infrared receiving element 302 may receive light rays in positive and negative directions to determine two light paths at positive and negative angles, where b1 is a received light ray in a positive direction, and b2 is a received light ray in a negative direction. Fig. 8a is a schematic diagram of an optical network receiving positive and negative angle optical paths, and fig. 8b is a schematic diagram of an optical network receiving negative angle optical paths, wherein black dots in the diagram are identifiable touch points, and it can be found by comparing fig. 8a and 8b that since the coverage range of the optical paths in the positive and negative directions is larger than the coverage range of the optical paths in one direction, the identification range of the touch points receiving the positive and negative angle optical paths in fig. 8a is significantly larger than the identification range of the touch points receiving only the negative angle optical paths in fig. 8b under the condition of setting the same number and interval.
In an embodiment of the present application, the present application is applied to a single-sided infrared touch device, and further provides a control system of the single-sided infrared touch device, as shown in fig. 9, in the control system 500, the control system includes: the infrared touch system includes a control unit 501, a transmission scanning circuit 502, a reception scanning circuit 503, an infrared transmission element 504, an infrared reception element 505, and a sampling circuit 506.
The emission scanning circuit 502 is connected to the control unit 501, and is configured to drive an infrared emission tube in the infrared emission element 504 to emit infrared rays under the control of the control unit 501; the receiving scanning circuit 503 is connected to the control unit 501, and is configured to drive the infrared receiving tube in the infrared receiving element 505 to receive infrared rays under the control of the control unit 501; the sampling circuit 506 is respectively connected to the infrared receiving element 505 and the control unit 501, and is configured to sample infrared rays received by the infrared receiving element 505 under the control of the control unit 501, and send a sampling signal to the control unit 501, so that the control unit 501 determines whether a touch point exists in a touch recognition range to determine whether a touch operation of a user is received.
It should be noted that the above-mentioned hardware structure is only a preferred embodiment provided for convenience of subsequent description of the embodiments of the present application, and in practical applications, corresponding hardware units may be integrated and combined or further decomposed, and on the basis of achieving the same technical effect, a change in a specific hardware unit deployment does not affect the protection scope of the present application. For example: the transmitting scanning circuit 502 and the infrared transmitting element 504 can also be collectively referred to as an infrared touch transmitting circuit, and the receiving scanning circuit 503 and the infrared receiving element 505 are collectively referred to as an infrared touch receiving circuit.
Under the cooperative control of the control system 500, a control method of the single-sided infrared touch device is further provided, in which a plurality of infrared emitting elements are sequentially scanned in a scanning period, and the position of an infrared receiving element receiving infrared light is determined during the period of starting one infrared emitting element.
The sequential scanning means that the infrared elements in the unilateral infrared touch device are sequentially turned on, and one infrared element is turned on one by one while all other infrared elements are turned off. Of course, it should be clear to those skilled in the art that the sequential scanning includes a sequential scanning manner one by one, and may also be an interval sequential scanning manner, and in a specific application scenario, a specific sequential scanning manner is selected as needed. And one scanning period refers to the time required for completing one scanning process by all the infrared emission units under the control of the control system.
The above method is embodied by the control system 500, and the emission scanning circuit 502 is specifically configured to sequentially scan a plurality of infrared emission elements 504 in one scanning period; a receive scanning circuit 503, specifically configured to turn on a plurality of infrared receiving elements during a period when one infrared emitting element is turned on; a sampling circuit 506, specifically configured to sample a plurality of infrared receiving elements during a period in which one infrared emitting element is turned on; the control unit 501 is specifically configured to determine the existence and the position of the touch point according to the sampling signal obtained by the sampling circuit 506.
In the embodiment of the application, when the light intensity amplitude received by any infrared receiving element acquired by the sampling circuit is greater than the threshold value, it can be considered that a touch point exists in the touch identification range currently. Further, when a touch point exists in the touch recognition range, on one hand, during the period that only one infrared emission element is turned on, the control unit can determine the specific position of the specifically turned-on infrared emission tube in the infrared emission element through the counter, that is, a light path where the touch point is located. On the other hand, when the control unit determines whether a touch point exists in the touch recognition range according to the sampling signal of the infrared receiving unit, then the control unit determines a specific infrared receiving tube in the infrared receiving unit which specifically receives infrared light according to the specific sampling signal, and then obtains another light path where the touch point is located according to the specific infrared receiving tube, so that intersection points of the two light paths which are respectively determined are obtained, wherein the intersection point position of the two light paths is the position in the touch recognition range where the touch point is located.
In some possible implementations of the embodiments of the application, all of the ir receiving elements are also scanned sequentially during the time that one ir emitting element is on. As shown in fig. 10, when each infrared emitting element is turned on in sequence in one scanning cycle, when a touch point a falls into the optical path of the infrared emitting element 301a, the infrared light emitted by the infrared emitting element 301a is reflected at the touch point a, wherein the reflected light is scattered in a plurality of different directions, since each infrared receiving element 302 can only receive light in a certain optical path, all the reflected scattered light only has reflected light parallel to the receiving optical path, and can only be received by one infrared receiving element 302, while the receiving angle range of the other infrared receiving elements 302 is limited, and the reflected infrared light cannot be received.
As shown in fig. 11, in the single-sided infrared touch device capable of receiving the positive and negative angle light paths, the touch point B falls in the light path of the infrared emitting element 301B, and falls in the positive direction light path and the negative direction light path of the infrared receiving element 302c, so that the intersection of the light path of 301B and the light path of 302c obtains the position of the touch point B, and the intersection of the light path of 301B and the light path of 302d also obtains the position of the touch point B.
In other possible implementation manners of the embodiment of the application, in order to alleviate the problem that the requirement on the scanning frequency is too high when the infrared receiving elements scan in sequence, in one scanning period, the plurality of infrared transmitting elements are scanned in sequence, and during the period of opening one infrared transmitting element, the plurality of infrared receiving elements can be simultaneously driven to be simultaneously opened. Specifically, a plurality of infrared receiving elements can be divided into groups, each group of infrared receiving elements can adopt a scanning mode, so that one infrared receiving element is opened in each group at any moment, and the scanning speed of the infrared receiving elements can be increased when a plurality of groups of infrared receiving elements scan simultaneously. In contrast, in the packet scanning mode, more adopted circuits are provided for simultaneously sampling a plurality of infrared receiving elements which are simultaneously turned on, so that a person skilled in the art selects a suitable specific implementation scanning mode when considering a specific application scenario or requirement, and of course, other modes which can improve the scanning speed of the infrared receiving elements may be adopted, and further description is omitted.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that:
in the unilateral infrared touch scheme provided in the embodiment of the application, in the unilateral infrared touch device, a plurality of infrared elements are arranged on one side in one direction, the plurality of infrared elements comprise infrared transmitting elements and infrared receiving elements which are arranged at intervals, a light path is determined by the central light of each infrared transmitting element for transmitting an infrared beam, and the plurality of infrared transmitting elements determine a plurality of parallel light paths; each infrared receiving element can receive the central light of the infrared light to determine at least one light path, wherein a plurality of infrared receiving elements determine a plurality of parallel light paths; therefore, the positions of the touch points are determined by the intersection points of the light paths respectively determined by the infrared transmitting element and the infrared receiving element, and the positions of the touch points can be determined by only arranging the infrared elements on a single side, so that the touch area is not limited by planes determined by four sides of a quadrangle and other three-side boundaries of a matrix, and the range of the touch area can be at least expanded in space.
On the other hand, an embodiment of the present application provides a touch recognition method, which is applied to the aforementioned single-sided infrared touch device, and fig. 12 is a flowchart illustrating the touch recognition method provided in the embodiment of the present application, as shown in fig. 12, the touch recognition method includes:
in step 110, a first position of the currently scanned infrared emitting unit is recorded during a scanning cycle.
In the embodiment of the application, the infrared emission units are sequentially scanned to control the opening of the infrared emission units, only one infrared emission element is driven to be opened at any time in one scanning period to enable the infrared emission elements to emit infrared light, and the control unit records the specific position of the infrared emission element which is driven to be opened currently through the internal counter in the sequential scanning control process.
Once a touch point exists in the touch identification area, the touch point reflects the currently emitted infrared light, and the reflected light triggers the received light intensity of the infrared receiving element to change, so that the emission light path of the touch point is determined according to the currently recorded position of the element emitting the light.
In step 130, during the period when one infrared emitting element is turned on, recording the second position of the infrared receiving unit with the received light intensity greater than the threshold value according to the sampling signal of each infrared receiving unit.
It should be noted that the threshold is used to represent the minimum light intensity of the infrared light reflected by the touch point entering the receiving element, and in the specific implementation process, a person skilled in the art may obtain the set threshold of each infrared receiving element in the specific touch device through an experimental manner.
In the embodiment of the application, in the process of controlling the infrared emitting elements to scan sequentially, during the period of currently starting a certain determined infrared emitting element, the received infrared light intensity of all the infrared receiving elements is sampled through traversal, and when the sampling light intensity of a certain infrared receiving element is determined to be greater than a threshold value, it is indicated that a touch point exists in a touch identification range. Further, the specific position of the infrared receiving element with the specific received light intensity larger than the threshold value is recorded.
Specifically, under the implementation condition that the infrared receiving unit is started by receiving in a sequential scanning mode, the current specific scanning infrared receiving unit can be recorded by a counter inside the control unit, and at the moment, when the light intensity of the sampling signal obtained by the corresponding circuit is greater than a threshold value, the position of the specific scanning infrared receiving unit is determined.
If the grouping scanning mode is adopted and started at the same time, a person skilled in the art can count through a counter inside the control unit and the position of the corresponding adopted device in the grouping, and can determine the specific position of the scanning infrared receiving unit of which the current specific received light intensity is greater than the threshold value, which is not described in detail herein.
In step 150, a first effective optical path is determined based on the first position, and at least a second effective optical path is determined based on the second position.
When it is determined in step 130 that a touch point exists in the touch recognition range, and the specific position of the infrared receiving element with the specific received light intensity greater than the threshold value is recorded, in step 150, the optical path parameter corresponding to the first position can be determined according to the first position and the mapping relation table of the position of the preset infrared emitting element and the optical path parameter.
And determining the optical path parameter corresponding to the second position according to the second position and a mapping relation table of the position of the preset infrared receiving element and the optical path parameter.
The mapping relation table of the positions of the infrared emission elements and the light path parameters determines the light path parameters corresponding to each infrared emission element by considering the infrared emission direction of the infrared emission elements during design. The optical path parameters include the coordinates of the initial boundary position and the final boundary position of the optical path, and the angle information or the slope information of the optical path.
In step 170, the optical path intersection point coordinate is determined according to the optical path parameter of the first effective optical path and the at least one second effective optical path parameter.
Specifically, a light path intersection point coordinate (i, j) is determined according to the effective light path pair in the effective light path set C, the intersection point coordinate (i, j) is a coordinate of one touch point, and the intersection point coordinate is stored in the touch point set Q for further effective touch point processing.
In this embodiment, it is preferable that after the step 170, the method further includes:
and 190, determining an effective touch point according to the determined light path intersection point coordinate.
Specifically, all touch points in the touch point set Q are checked for the presence of the same touch point, that is, the touch points with x and y equal to each other, and if so, the duplicate touch points are deleted until no duplicate touch point exists in the touch point set Q. As shown in fig. 11, the emission light path intersects both the positive reflection light path and the negative reflection light path at the same point, i.e. the same contact is calculated twice and needs to be removed.
Further, the present application also provides a touch recognition method, which is applied to the single-sided infrared touch device in the foregoing embodiment, as shown in fig. 13, the touch recognition method includes the steps of:
in step 151, in one scanning period, the effective optical path set C is initialized.
In this embodiment, in each scanning period, the effective optical path set C is cleared.
In this embodiment, when the control unit controls the emission scanning circuit to scan the infrared emission element, the counter records the number of bits of the currently scanned infrared emission element. After one scanning period is finished, the counter is cleared, and the counter is counted again in the next scanning period.
During the current starting period of the ith transmitting element, sequentially judging whether receiving light intensity in all receiving elements is greater than a threshold value, if so, indicating that a touch point exists; if not, the touch point does not exist.
During the ith emitting element is turned on, there is no touch point condition, the next (i + 1) th emitting element is continuously scanned to be turned on, and then the received light intensity is determined in step 153.
And if the touch point exists, recording the infrared receiving element with the light intensity larger than the threshold value through the counter.
Corresponding optical path information can be determined for the ith recorded transmitting element and the optical path is determined as an effective optical path; and recording the jth receiving element to determine a corresponding receiving optical path signal and deeming an effective optical path.
And repeating the steps until all the infrared emission elements finish traversing scanning, and finishing the identification step in the scanning period.
And next, respectively determining the position coordinates of the touch points according to the effective light path pairs in the scanning period.
Based on the same concept of the touch recognition method, in the embodiment of the present application, a touch recognition device is further provided, as shown in fig. 14, which is a schematic structural diagram of the touch recognition device provided in the embodiment of the present application, as shown in fig. 14, the touch recognition device 700 includes:
and an infrared emission scanning recording unit 710, configured to record a first position of the currently scanned infrared emission unit in one scanning cycle.
And the infrared receiving scanning recording unit 720 is used for recording the second position of the infrared receiving unit with the received light intensity larger than the threshold value according to the sampling signal of each infrared receiving unit during the starting period of one infrared emitting element.
An effective optical path determining unit 730, configured to determine a first effective optical path according to the first position, and determine at least a second effective optical path according to the second position.
An optical path intersection coordinate determining unit 740, configured to determine an optical path intersection coordinate according to the optical path parameter of the first effective optical path and the at least one second effective optical path parameter.
The effective touch point determining unit 750 is configured to determine an effective touch point according to the determined light path intersection point coordinates.
Fig. 15 is a schematic structural diagram of a touch recognition device of a terminal device according to an embodiment of the present invention. As shown in fig. 15, the touch recognition device 600 may include: at least one processor (processor)601, memory 602, peripheral interface 603, input/output subsystem 604, power lines 605, and communication lines 606.
In fig. 15, arrows indicate that communication and data transfer between components of the computer system are possible, and that the communication and data transfer may be implemented using a high-speed serial bus (high-speed serial bus), a parallel bus (parallel bus), a Storage Area Network (SAN), and/or other appropriate communication technology.
The memory 602 may include an operating system 612 and a touch recognition program 622. For example, the memory 602 may include a high-speed random access memory (high-speed random access memory), a magnetic disk, a static random access memory (SPAM), a Dynamic Random Access Memory (DRAM), a Read Only Memory (ROM), a flash memory, or a non-volatile memory. The memory 602 may store program codes for the operating system 612 and the touch recognition program 622, which may include software modules, instruction set architectures, or various data other than those required for the operation of the touch recognition device 600. In this case, the access to the memory 602 and other controllers such as the processor 601 and the peripheral interface 606 may be controlled by the processor 601.
The peripheral interface 603 may combine input and/or output peripherals of the touch recognition device 600 with the processor 601 and memory 602. Also, the input/output subsystem 604 may combine a variety of input/output peripherals with the peripheral interface 606. For example, the input/output subsystem 604 may include a display, keyboard, mouse, printer, or controller for integrating peripherals such as cameras, various sensors, etc., with the peripheral interface 603, as desired. Specifically, the input/output subsystem 604 includes a controller for combining the infrared touch transmitting circuit and the infrared touch receiving circuit with the peripheral interface 603. According to another aspect, the input/output peripheral can be combined with the peripheral interface 603 without going through the input/output subsystem 604, i.e., the infrared touch transmitting circuit and the infrared touch receiving circuit can be combined with the peripheral interface 603 without going through the input/output subsystem 604.
The power line 605 may supply power to all or part of the circuit elements of the terminal device. For example, the power line 605 may include, for example, a power management system, a battery or one or more power supplies for Alternating Current (AC), a charging system, a power failure detection circuit (power failure detection circuit), a power converter or inverter, a power status marker, or any other circuit element for power generation, management, distribution.
The communication link 606 may utilize at least one interface to communicate with other computer systems, such as with a remote control system.
The processor 601 may perform various functions of the touch recognition device 600 and process data by executing software modules or instruction set architectures stored in the memory 602. That is, the processor 601 can be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output operations of a computer system.
The processor 601 is configured to execute the touch recognition method of the above embodiment.
The embodiment of fig. 15 is only one example of the infrared signal interference resisting apparatus 600 of the terminal device, and the touch recognition apparatus 600 may have the following structure or configuration: some of the circuit elements shown in fig. 15 are omitted, additional circuit elements not shown in fig. 15 are further provided, or two or more circuit elements are combined. For example, the computer system of the communication terminal for a mobile environment may further include a sensor or the like in addition to the circuit elements shown in fig. 15, and may also include a circuit for RF communication of a plurality of communication means (WiFi, 6G, LTE, Bluetooth, NFC, Zigbee, or the like) in the communication line 606. The circuit elements that may be included in the anti-infrared signal interference device 600 may be implemented by hardware, software, or a combination of both hardware and software, including integrated circuits that are specialized in more than one signal processing or application.
The embodiment of the invention also provides touch terminal equipment, which comprises an equipment main body; the device body includes the single-sided infrared touch device in the above embodiment and the touch recognition device in the above embodiment.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is merely a detailed description of the invention, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the invention, and should be considered as within the scope of the invention.
Claims (10)
1. The utility model provides a unilateral infrared touch device, is applied to among the infrared touch screen, its characterized in that, unilateral infrared touch device includes:
the infrared touch screen comprises a plurality of infrared elements, a plurality of touch screen control modules and a plurality of touch screen control modules, wherein the infrared elements comprise infrared transmitting elements and infrared receiving elements which are arranged at intervals and are arranged on the same-direction side edge of a rectangular touch frame of the infrared touch screen;
the infrared emission element is used for emitting infrared rays, and a light path is determined by taking the central light ray of each infrared ray as a reference, so that a plurality of infrared emission elements determine a plurality of parallel light paths;
an infrared receiving element for receiving infrared rays, at least one optical path being determined with reference to a central ray of each of the infrared rays, so that a plurality of the infrared receiving elements determine a plurality of parallel optical paths,
the method comprises the steps of scanning a plurality of infrared emission elements in sequence in a scanning period, and determining the position of an infrared receiving element receiving infrared rays during the period that the first infrared emission element is started so as to determine the position of a touch point according to intersection points of light paths respectively determined by the infrared emission elements and the infrared receiving element.
2. The single-sided infrared touch device of claim 1, wherein the plurality of parallel light paths defined by the infrared emitting element are perpendicular to the side of the direction in which the infrared element is located.
3. The single-sided infrared touch device of any one of claims 1-2, wherein the single-sided infrared touch device comprises a control system, the control system comprising: the device comprises a control unit, a transmitting scanning circuit, a receiving scanning circuit, an infrared transmitting element, an infrared receiving element and a sampling circuit;
the emission scanning circuit is connected with the control unit and used for driving the infrared emission element to emit infrared rays under the control of the control unit;
the receiving scanning circuit is connected with the control unit and used for driving the infrared receiving element to receive infrared rays under the control of the control unit;
the sampling circuit is respectively connected with the infrared receiving element and the control unit and used for sampling infrared rays received by the infrared receiving element under the control of the control unit and sending sampling signals to the control unit so that the control unit can determine whether touch points exist in a touch identification range.
4. The single-sided infrared touch device according to claim 3, wherein the emission scanning circuit is specifically configured to sequentially scan the plurality of infrared emission elements in one scanning cycle;
the receiving scanning circuit is specifically used for turning on the plurality of infrared receiving elements during the turning on period of one infrared emitting element;
the sampling circuit is specifically used for sampling the plurality of infrared receiving elements respectively during the starting period of one infrared emitting element;
and the control unit is specifically used for determining the existence and the position of the touch point according to the sampling signal obtained by the sampling circuit.
5. The single-sided infrared touch device of claim 4, wherein the receive scanning circuit is specifically configured to sequentially scan and turn on the plurality of infrared receiving elements during a period when one infrared emitting element is turned on.
6. The single-sided infrared touch device of claim 5, wherein the receive scanning circuit is specifically configured to scan the plurality of infrared receiving elements in groups during a period when one infrared emitting element is turned on, so as to turn on all of the plurality of infrared receiving elements.
7. A touch recognition method applied to the one-sided infrared touch device as claimed in any one of claims 1 to 6, wherein the touch recognition method comprises:
recording a first position of a currently scanned infrared emission unit in a scanning period;
recording a second position of the infrared receiving unit with the received light intensity greater than the threshold value according to the sampling signal of each infrared receiving unit during the starting period of the infrared transmitting element;
determining a first effective light path according to the first position, and determining at least one second effective light path according to the second position;
and determining the coordinates of the intersection point of the optical paths according to the optical path parameters of the first effective optical path and the optical path parameters of the at least one second effective optical path.
8. The touch recognition method according to claim 7, wherein after the step of determining the coordinates of the intersection of the optical paths according to the optical path parameters of the first effective optical path and the optical path parameters of the at least one second effective optical path, the touch recognition method further comprises:
and determining an effective touch point according to the determined light path intersection point coordinate.
9. The touch identification method according to any one of claims 7 to 8, wherein the light path parameters include a start boundary position coordinate and an end boundary position coordinate of the light path, and angle information or slope information of the light path.
10. A touch terminal device is characterized by comprising a device main body; the single-sided infrared touch device as claimed in any one of claims 1 to 6 is included in the device main body.
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| CN115016677B (en) * | 2021-09-28 | 2023-04-07 | 荣耀终端有限公司 | Touch control assembly and electronic equipment |
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| TWI409680B (en) * | 2010-08-17 | 2013-09-21 | Hon Hai Prec Ind Co Ltd | Infrared controlling device |
| JP2012053840A (en) * | 2010-09-03 | 2012-03-15 | Toshiba Tec Corp | Optical touch device |
| CN103984443A (en) * | 2013-02-07 | 2014-08-13 | 深圳市艾博德科技有限公司 | Infrared touch screen and touch point positioning method |
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| CN105094455A (en) * | 2014-05-19 | 2015-11-25 | 上海沐泽信息技术有限公司 | Device and method for improving strong light interference resistance of infrared touch screen |
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