CN118466790A - Infrared touch frame and interactive panel - Google Patents
Infrared touch frame and interactive panel Download PDFInfo
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- CN118466790A CN118466790A CN202410931825.9A CN202410931825A CN118466790A CN 118466790 A CN118466790 A CN 118466790A CN 202410931825 A CN202410931825 A CN 202410931825A CN 118466790 A CN118466790 A CN 118466790A
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Abstract
The embodiment of the application provides an infrared touch frame and an interactive tablet, wherein the infrared touch frame comprises at least two infrared touch panels which are connected with each other; each infrared touch panel is provided with an infrared emission circuit and an infrared receiving circuit, and the infrared emission circuit comprises a voltage buffer module, a switch module, a gain amplifying module and a plurality of infrared emission pieces; a plurality of infrared emission pieces are connected with each other to form an infrared emission matrix; the input end of the voltage buffer module is used for receiving an infrared emission gain control signal; the output end of the voltage buffer module is connected to the input end of the gain amplifying module; the controlled end of the switch module is used for receiving the switch on-off control signal; the first signal end of the switch module is used for receiving a switch lamp control signal of the infrared emission piece; the second signal end of the switch module is connected to the input end of the gain amplifying module; the output end of the gain amplification module is connected to the power signal bus through the infrared emission matrix. The application can reduce the interference to the infrared receiving signal.
Description
Technical Field
The embodiment of the application relates to the field of infrared signal processing, in particular to an infrared touch frame and an interactive panel.
Background
The infrared touch frame is characterized in that a plurality of infrared emitters and a plurality of infrared receivers are arranged on four frames of the frame body, the infrared emitters are controlled to emit infrared signals, the infrared receivers acquire the infrared signals to obtain corresponding infrared receiving signals, and after a series of stable adjustment, A/D (analog to digital converter, analog-to-digital converter) sampling and other processing are carried out on the infrared receiving signals, whether an object shields infrared light or not is judged through whether the processed infrared receiving signals are changed, so that touch operation conditions and the like are judged.
Because the infrared receiving signal belongs to weak analog signals, and other strong signals exist on the infrared touch panel at the same time, the weak infrared receiving signal is easy to be interfered by the other strong signals and the strong power signals.
Disclosure of Invention
In order to overcome the problems in the related art, the application provides an infrared touch frame and an interactive panel, which can reduce interference to infrared receiving signals.
According to a first aspect of an embodiment of the present application, there is provided an infrared touch frame including at least two infrared touch panels connected to each other; each infrared touch pad is provided with an infrared transmitting circuit and an infrared receiving circuit, and the infrared transmitting circuit comprises a voltage buffer module, a switch module, a gain amplifying module and a plurality of infrared transmitting pieces; the infrared emission pieces are connected with each other to form an infrared emission matrix;
The input end of the voltage buffer module is connected with the analog signal bus and is used for receiving an infrared emission gain control signal; the output end of the voltage buffer module is connected to the input end of the gain amplifying module;
The controlled end of the switch module is used for receiving a switch on-off control signal; the first signal end of the switch module is used for receiving a switch lamp control signal of the infrared emission piece; the second signal end of the switch module is connected to the input end of the gain amplifying module; the third signal end of the switch module is grounded; wherein, the on-off control signal of the switch is determined based on the working state of an infrared emission piece on the infrared touch panel;
the output end of the gain amplification module is connected to a power signal bus through the infrared emission matrix; the common ground of the gain amplification modules is grounded.
According to a second aspect of the embodiment of the present application, an interactive tablet is provided, including the above-mentioned infrared touch frame.
The infrared touch frame is connected with at least two infrared touch plates through at least two infrared touch plates; an infrared transmitting circuit and an infrared receiving circuit are arranged on each infrared touch panel, a voltage buffer module, a switch module, a gain amplifying module and a plurality of infrared transmitting pieces are arranged on the infrared transmitting circuit, and when the working state of any one of the infrared transmitting pieces on the infrared touch panel is the transmitting state, the gain amplifying module on the infrared touch panel is controlled by an infrared transmitting gain control signal and a switch lamp control signal, so that the infrared transmitting pieces on the infrared touch frame panel can work normally; when the working states of all infrared emitting pieces on the infrared touch panel are not in the emitting state, the gain amplifying module on the infrared touch panel is cut off, so that a current signal of an infrared emitting matrix is not controlled by an infrared emitting gain control signal and a switch lamp control signal, namely, an infrared emitting circuit on the infrared touch panel on the infrared touch frame panel is kept unchanged, and interference on infrared receiving signals is reduced, and especially interference on infrared receiving signals on the same infrared touch panel is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an arrangement of an infrared emitting member and an infrared receiving member in the related art;
FIG. 2 is a schematic diagram of another related art arrangement of an infrared emitting member and an infrared receiving member;
FIG. 3 is a schematic diagram of an arrangement of an infrared touch panel in the related art;
FIG. 4 is a schematic diagram of an infrared emission circuit in the related art;
FIG. 5 is a schematic diagram of an infrared emission circuit according to one embodiment of the present application;
FIG. 6 is a schematic diagram of a switch module according to one embodiment of the application;
FIG. 7 is a schematic diagram of a switch module according to another embodiment of the present application;
FIG. 8 is a schematic diagram showing the structure of an infrared emission circuit according to an embodiment of the present application;
FIG. 9 is a schematic diagram of an infrared emission circuit according to another embodiment of the present application;
FIG. 10 is a schematic diagram of an infrared emission circuit according to another embodiment of the present application;
FIG. 11 is a block diagram illustrating a schematic structure of an interactive tablet according to one embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. Where the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.
It should be understood that the embodiments described in the examples described below do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items, e.g., a and/or B, may represent: a exists alone, a and B exist together, and B exists alone; the character "/" generally indicates that the context-dependent object is an "or" relationship.
It should be appreciated that, although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms, and these terms are merely used to distinguish between similar objects and do not necessarily describe a particular order or sequence or imply relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. The word "if"/"if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination", depending on the context.
The infrared touch frame is characterized in that a plurality of infrared emitters and a plurality of infrared receivers are arranged on four frames of the frame body, the infrared emitters are controlled to emit infrared signals, the infrared receivers acquire the infrared signals to obtain corresponding infrared receiving signals, and whether objects shield infrared light or not is judged through whether the processed receiving signals change or not after a series of stable adjustment, A/D (analog to digital converter, analog-digital converter) sampling and other processes are carried out on the receiving signals, so that touch operation conditions and the like are judged.
Among them, in the related art, there are mainly two modes of setting up infrared transmitting piece and infrared receiving piece on four frames of infrared touch frame: as shown in fig. 1, one is that an infrared emitting member and an infrared receiving member are respectively arranged at two opposite sides of a touch frame; as shown in fig. 2, another way is that the infrared emitting elements and the infrared receiving elements are arranged on the same side of the touch frame in a staggered manner, wherein in fig. 1 and 2, white circles represent the infrared emitting elements, and black circles represent the infrared receiving elements.
Specifically, referring to fig. 3, a plurality of infrared touch pads 100 are disposed on four frames of the infrared touch frame. According to different functions and positions, the infrared touch panels 100 are divided into a main board and a plurality of slave boards, and an analog signal bus, a digital signal bus, a synchronous signal bus and a power signal bus are connected between the main board and the slave boards.
The main board and the slave board share a power signal bus to provide power signals for the infrared emitting piece and the infrared receiving piece which are respectively connected, namely a power supply.
Before the scanning starts, the main board transmits scanning data for controlling the infrared emission parts to each slave board through the digital signal bus; and each slave board shares the digital signal bus to acquire respective scanning data respectively, and controls respective infrared emission parts to perform scanning work according to the respective scanning data. The scanning data comprise position information of an infrared receiving lamp and an infrared transmitting lamp which are connected with the slave board, corresponding scanning logic and the like.
After the scanning starts, the mainboard transmits a synchronizing signal to each slave board through a synchronizing signal bus to control the corresponding slave board to scan, specifically, after the slave board receives the synchronizing signal sent by the mainboard, the slave board triggers the execution of scanning according to the synchronizing signal, the slave board reads the scanning data stored by itself, and the working states of the connected infrared receiving piece and infrared transmitting piece are controlled according to the synchronizing signal. The type of the synchronous signal bus can be an analog signal bus or a digital signal bus.
Meanwhile, the mainboard transmits an infrared emission gain control signal to each slave board through the analog signal bus so as to control the emission power of the infrared emission piece on the corresponding slave board.
Each slave board shares an analog signal bus, and an analog electric signal (hereinafter referred to as an "infrared receiving signal") corresponding to the infrared signal received by the infrared receiving element is loaded onto the analog signal bus and transmitted to the master board; the host board detects an infrared receiving signal from the analog signal bus and converts the infrared receiving signal into a digital signal; the digital signals are used for calculating the coordinate positions of the touch objects.
It should be understood that the above-mentioned analog signal bus and digital signal bus are a group of transmission harnesses composed of a plurality of wires, and when different signals are transmitted through the analog signal bus or the digital signal bus at the same time, the different signals are distributed to different channels or wires for transmission, for example, when the type of the synchronization signal bus is the analog signal bus, the analog signal bus transmits the synchronization signal, the infrared emission gain control signal, and the infrared reception signal at the same time, and when the analog signal bus distributes the synchronization signal, the infrared emission gain control signal, and the infrared reception signal to different channels or wires for transmission.
The principle that the received signal is interfered is described below by combining the structure of the infrared touch panel for the case that the infrared emitting piece and the infrared receiving piece are arranged on the same side of the touch frame in a staggered manner.
Referring to fig. 3 and 4, each infrared touch pad 100 (a motherboard and a slave board) is provided with an infrared emitting circuit 101 and an infrared receiving circuit 102. The infrared emission circuit 101 comprises a voltage buffer QT3, a switch QT2, a gain amplifier QT1 and a plurality of infrared emission components (not shown in the figure); a plurality of infrared emission pieces are connected with each other to form an infrared emission matrix; the infrared receiving circuit comprises a plurality of infrared receiving elements (not shown).
The input end of the voltage buffer QT3 is connected with the analog signal bus and is used for receiving an infrared emission gain control signal; the common terminal of the voltage buffer QT3 is connected to the reference power supply VCC via a resistor RG9, and the output terminal of the voltage buffer QT3 is connected to the input terminal of the gain amplifier QT1 via a resistor RG 10.
The controlled end of the switch element QT2 is connected with the synchronous signal bus and is used for receiving the synchronous signal; the first signal end of the switch QT2 is grounded; the second signal terminal of the switching element QT2 is connected to the input terminal of the gain amplifier QT 1. The output end of the gain amplifying piece QT1 is connected to the power signal bus PWR through an infrared emission matrix; the common ground of the gain amplifier QT1 is grounded. The synchronization signals include a switch light control signal for controlling whether or not each of the infrared emitting elements on the infrared touch panel 100 is operated.
Although only one infrared emitting piece on one infrared touch panel works at the same time, since the infrared touch panel is provided with a plurality of infrared emitting pieces, if any one of the infrared emitting pieces on the infrared touch panel works, the infrared touch panel is considered to be in an emitting state, and if all the infrared emitting pieces on the infrared touch panel do not work, the infrared touch panel is considered to be in a non-emitting state.
Then, for the infrared touch panel in the transmitting state, the gain amplifying module on the infrared touch panel amplifies the infrared transmitting gain control signal according to the infrared transmitting gain control signal and the synchronizing signal, and then the infrared transmitting piece in the infrared transmitting matrix of the infrared touch panel is driven to work, so that the power signal on the infrared transmitting matrix is changed sharply. For the infrared touch panel in the non-transmitting state, the infrared transmitting circuit 101 comprises a voltage buffer QT3, a switch QT2 and a gain amplifying QT1, the infrared transmitting gain control signal is amplified under the control of the infrared transmitting gain control signal and the synchronizing signal, and the coupling path of the wiring of the infrared transmitting circuit 101 in the infrared touch panel and the analog signal bus is too long, so that the infrared receiving signal received by the infrared receiving part on the infrared touch panel in the non-transmitting state is also subjected to crosstalk of the infrared transmitting circuit 101, and the crosstalk of the infrared transmitting circuits 101 of a plurality of infrared touch panels also generates superposition effect on the infrared receiving signal.
As will be understood, crosstalk refers to noise on a line caused by coupling, mutual inductance or mutual capacitance between two signal lines, and in particular, when two signal lines transmit different signals, even though they are not in contact, smaller signals are induced in adjacent signal lines due to interaction of an electric field (capacitive coupling) and a magnetic field (inductive coupling), thereby causing the signals detected by the adjacent signal lines to be disturbed.
When the working state of any one infrared emission piece on the infrared touch panel is the emission state, the gain amplification module of the infrared touch panel is controlled by the switch lamp control signal and the infrared emission gain control signal, so that the infrared emission circuit on the infrared touch panel changes according to the change of the infrared emission gain control signal and the switch lamp control signal, and the normal operation of the infrared emission piece is ensured; when the working states of all infrared emission pieces on the infrared touch panel are not emission states, the gain amplification module on the infrared touch panel is cut off, and then the gain amplification module of the infrared touch panel is not controlled by the switch lamp control signal and the infrared emission gain control signal, so that the current signal of the infrared emission matrix is not changed according to the change of the infrared emission gain control signal and the switch lamp control signal, namely, the infrared emission circuit on the infrared touch panel is kept unchanged, the interference to infrared receiving signals is reduced, and particularly the interference to the infrared receiving signals on the same infrared touch panel is reduced.
The infrared touch frame provided by the embodiment of the application will be described in detail with reference to fig. 5 to 10.
Referring to fig. 5, an infrared touch frame provided by an embodiment of the present application includes at least two infrared touch pads connected to each other; each infrared touch panel is provided with an infrared emission circuit and an infrared receiving circuit, and the infrared emission circuit comprises a voltage buffer module 11, a switch module 12, a gain amplifying module 13 and a plurality of infrared emission pieces; a plurality of infrared emitting members are interconnected to form an infrared emitting matrix 14.
The input end of the voltage buffer module 11 is connected with the analog signal bus and is used for receiving an infrared emission gain control signal V_TAGC; the common terminal of the voltage buffer module 11 is connected to a reference power supply VCC; the output of the voltage buffer module 11 is connected to the input of the gain amplification module 13.
The controlled end of the switch module 12 is used for receiving a switch on-off control signal K; the first signal end of the switch module 12 is used for receiving a switch lamp control signal TEN of the infrared emission component; the second signal end of the switch module 12 is connected to the input end of the gain amplifying module 13; the third signal terminal of the switch module 12 is grounded.
The output end of the gain amplification module 13 is connected to a power signal bus through an infrared emission matrix 14; the common ground of the gain amplification block 13 is grounded.
The switch on-off control signal K is a control signal sent by the infrared touch panel and is a signal determined based on the working state of an infrared emitting piece on the infrared touch panel.
Specifically, when the working state of any one of the infrared emitting elements on the infrared touch panel is the emitting state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal end of the switch module 12 is conducted with the first signal end, and the gain amplifying module 13 can be controlled by the switch lamp control signal TEN and the infrared emission gain control signal v_tagc. When all the working states of the infrared emission parts on the infrared touch panel are not emission states, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal end and the third signal end of the switch module 12 are conducted, the input end of the gain amplification module 13 is grounded, the gain amplification module 13 is cut off, and the gain amplification module 13 is not controlled by the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC.
It should be understood that, since the on-off control signal K is a control signal sent by the infrared touch pad, the wiring is extremely short, and the influence on the receiving signal of the infrared receiving element is not great and can be ignored.
The working principle of the embodiment of the application is specifically described below:
When the working state of any one infrared emission piece on the infrared touch panel is an emission state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal end of the switch module 12 is conducted with the first signal end of the switch module 12, the gain amplification module 13 can be controlled to be on-off by the switch lamp control signal TEN, the power signal PWR of the infrared emission matrix 14 is changed according to the change of the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, and the infrared emission piece works normally. In general, only one infrared touch pad works at the same time, so that only the power signal of the infrared emitting matrix 14 on one infrared touch pad changes, and the interference path between the power signal and the infrared receiving signal on the infrared touch pad is shorter, so that the interference influence on the infrared receiving signal is smaller.
When the working states of all infrared emission parts on the infrared touch panel are not emission states, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal end of the switch module 12 is conducted with the third signal end of the switch module 12, and the input end of the gain amplification module 13 is grounded, so that the gain amplification module 13 is cut off, at the moment, the gain amplification module 13 is not controlled by the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC, even if the gain amplification module 13 is not changed due to the change of the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC, the power signal of the infrared emission matrix 14 is kept unchanged, the power signal on the infrared emission matrix is not changed, and interference on infrared receiving signals on the infrared touch panel is reduced, especially interference on infrared receiving signals on the same infrared touch panel is reduced.
The infrared touch frame provided by the embodiment of the application is formed by at least two infrared touch plates which are connected with each other; an infrared emission circuit and an infrared receiving circuit are arranged on each infrared touch panel, a voltage buffer module 11, a switch module 12, a gain amplification module 13 and a plurality of infrared emission parts are arranged on the infrared emission circuit, and when the working state of any one of the infrared emission parts on the infrared touch panel is an emission state, the gain amplification module 13 on the infrared touch panel is controlled by an infrared emission gain control signal V_TAGC and a switch lamp control signal TEN, so that the infrared emission parts on the infrared touch frame panel can work normally; when the working states of all infrared emission parts on the infrared touch panel are not emission states, the gain amplification module 13 is cut off, so that current signals of an infrared emission matrix are not controlled by an infrared emission gain control signal V_TAGC and a switch lamp control signal TEN, an infrared emission circuit on the infrared touch panel on the infrared touch frame panel is kept unchanged, even if power signals on the infrared emission matrix do not generate abrupt change any more, interference on infrared receiving signals on the infrared touch panel is reduced, and interference on infrared receiving signals on the same infrared touch panel is further reduced.
In an alternative embodiment, the switching lamp control signal TEN is determined directly by the synchronization signal. Specifically, the first signal end of the switch module 12 is connected to the synchronization signal bus, and is configured to receive a synchronization signal; the synchronization signal includes a switching lamp control signal TEN.
Wherein it should be understood that the synchronization signal is used to control the operating state of each infrared emitting element of each infrared touch pad.
In order to avoid interference to other signals when the synchronous signals are transmitted through the synchronous signal bus. Therefore, when one infrared touch panel (main board) transmits a synchronizing signal, the synchronizing signal is attenuated by a signal attenuation circuit, and then the attenuated synchronizing signal is transmitted to other infrared touch panels (slave boards) by a synchronizing signal bus; after the other infrared touch panels (slave panels) receive the attenuated synchronous signals, the signals are amplified and restored by a signal conditioning circuit to obtain restored synchronous signals.
In the embodiment of the application, the synchronous signal comprises the switching lamp control signal TEN, and at the moment, the synchronous signal is attenuated and then transmitted when the mainboard is used, so that the influence of the change of the synchronous signal on the infrared receiving signal in the transmission process is small, can be ignored, and the driving force of the signal is not influenced when the slave board is subjected to amplification and reduction treatment, therefore, the influence on the infrared receiving signal can be reduced by adopting the synchronous signal as the switching lamp control signal TEN.
In another alternative embodiment, the switch light control signal TEN is determined by the controller of the infrared touchpad based on the synchronization signal. Specifically, the infrared touch panel further comprises a controller; the input end of the controller is connected with the synchronous signal bus and is used for receiving synchronous signals; the controller determines a switch lamp control signal TEN of the infrared emission part based on the synchronous signal; the first signal end of the switch module 12 is connected to the first output end of the controller, and is configured to receive the switch lamp control signal TEN sent by the controller.
It can be understood that the other infrared touch panels (slave panels) receive the attenuated synchronization signals, amplify and restore the attenuated synchronization signals, then distribute the restored synchronization signals to their own controllers, and the controllers send the infrared emission element row-column control signals to the infrared emission matrix according to the synchronization signals, and then the infrared emission element row-column control signals control the operation of each infrared emission element of the infrared emission element matrix. Moreover, the controller determines the switch lamp control signal TEN of the infrared transmitting element on the infrared touch panel according to the synchronization signal, so that the coupling path between the synchronization signal bus and the wiring of the infrared transmitting circuit 101 in the infrared touch panel can be further shortened, and the interference on the infrared receiving signal can be further reduced.
In an alternative embodiment, the switch on-off control signal K is determined by the infrared touchpad based on the synchronization signal. Specifically, the infrared touch panel further comprises a controller; the input end of the controller is connected with the synchronous signal bus and is used for receiving synchronous signals; the controller determines the working state of an infrared emission piece on the infrared touch panel based on the synchronous signal, and determines a switch on-off control signal K based on the working state of the infrared emission piece on the infrared touch panel; the controlled end of the switch module 12 is connected with the second output end of the controller, and is used for receiving the switch on-off control signal K sent by the controller.
It can be understood that the other infrared touch panels (slave panels) receive the attenuated synchronization signals, amplify and restore the attenuated synchronization signals, then distribute the restored synchronization signals to their own controllers, and the controllers send the infrared emission element row-column control signals to the infrared emission matrix according to the synchronization signals, and then the infrared emission element row-column control signals control the operation of each infrared emission element of the infrared emission element matrix. The controller determines a switch on-off control signal K based on the synchronization signal, and controls on-off of the switch module 12. That is, the on-off control signal K of the switch in the embodiment of the application is a control signal of the infrared touch pad, the wiring is extremely short, the interference effect on the received signal is not great, and the interference effect can be ignored.
In the embodiment of the application, the controller on the infrared touch panel determines the working state of the infrared emitting piece on the infrared touch panel according to the synchronous signal, and then determines the on-off control signal K of the switch based on the working state of the infrared emitting piece on the infrared touch panel to control the switch module 12, so that the control complexity can be reduced, the control wiring is shortened, and the interference on the infrared receiving signal is reduced.
In an alternative embodiment, when the controller determines that the working state of any one of the infrared emitting elements on the infrared touch panel is the emitting state according to the synchronous signal, the controller determines that the infrared touch panel is the emitting state, and controls the switch module 12 through the switch on-off control signal K to enable the second signal end of the switch module 12 to be conducted with the first signal end of the switch module 12, so that the gain amplification module 13 is controlled to be turned on and off by the switch lamp control signal TEN, and the gain amplification module 13 is controlled to be controlled by the infrared emission gain control signal v_tagc to adjust the current signal, so that the infrared emitting elements on the infrared touch panel can work normally. If the controller determines that the working states of all the infrared emission pieces on the infrared touch panel are not emission states according to the synchronous signals, the infrared touch panel is determined to be in a non-emission state, the switch module 12 is controlled by the switch on-off control signal K, the second signal end of the switch module 12 is conducted with the third signal end of the switch module 12, the gain amplification module 13 is grounded, and then the gain amplification module 13 is cut off, so that the gain amplification module 13 is not controlled by the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC, an infrared emission circuit on the infrared touch panel on the infrared touch frame panel is kept unchanged, even if the power signals on the infrared emission matrix are not changed, and interference on infrared receiving signals on the same infrared touch panel is reduced.
In an alternative embodiment, when the switch module of one infrared touch pad is turned on and works, the switch modules of the other infrared touch pads are turned off. That is, only the switch module of one infrared touch pad works at the same time, so that when all infrared emitting pieces on other infrared touch pads do not work, the infrared emission gain control signals are prevented from being amplified under the control of the infrared emission gain control signals and the infrared lamp control signals, and meanwhile, the interference of crosstalk of the infrared emission circuits of a plurality of infrared touch pads on infrared receiving signals caused by overlong coupling paths of wires and analog signal buses of the infrared emission circuits in the infrared touch pad is prevented.
Referring to fig. 8, in an alternative embodiment, the voltage buffer module 11 includes a voltage buffer element QT3, a first resistor RG9, and a second resistor RG8.
The input end of the voltage buffer element QT3 is the input end of the voltage buffer module 11 and is connected with the analog signal bus and used for receiving an infrared emission gain control signal V_TAGC; the first connecting end of the voltage buffer element QT3 is connected with the first end of the first resistor RG9, and the second end of the first resistor RG9 is a common end of the voltage buffer module 11 and is used for being connected with a reference power supply VCC; the second connection end of the voltage buffer element QT3 is an output end of the voltage buffer module 11 and is connected to the input end of the gain amplifying module 13, and the second connection end of the voltage buffer element QT3 is further grounded via the second resistor RG 8.
The voltage buffer element QT3, the first resistor RG9 and the second resistor RG8 are used for amplifying the infrared emission gain control signal V_TAGC in a following manner so as to increase the driving capability of the infrared emission gain control signal V_TAGC on the gain amplification module, so that the gain amplification module can timely react according to the infrared emission gain control signal V_TAGC, and the accuracy of detecting the infrared receiving signal is improved.
It should be understood that the voltage buffer module 11 may be an integrated voltage buffer chip or other device structures that can implement the solution of the present application, and the present application is not limited thereto.
The voltage buffer element QT3 is a first field effect transistor; the grid electrode of the first field effect transistor is the input end of the voltage buffer element QT 3; the drain electrode or the source electrode of the first field effect transistor is a first connection end of the voltage buffer element QT 3; the source or drain of the first field effect transistor is the second connection terminal of the voltage buffer element QT 3.
Or the voltage buffer element QT3 is a first triode; the base of the first triode is the input end of the voltage buffer element QT 3; the collector or emitter of the first triode is the first connection terminal of the voltage buffer element QT 3; the emitter or collector of the first transistor is the second connection of the voltage buffer element QT 3.
It is to be understood that the voltage buffer element QT3 may be other device structures such as a voltage buffer element that can implement the solution of the present application, and the present application is not limited thereto.
Referring to fig. 6, in an alternative embodiment, the switch module 12 includes a first switch element 121 and a second switch element 122.
The controlled end of the first switch element 121 is the controlled end of the switch module 12, and is used for receiving a switch on-off control signal K of the infrared touch panel; the third connection end of the first switching element 121 is a first signal end of the switching module 12, and is configured to receive a switching lamp control signal TEN; the fourth connection terminal of the first switching element 121 is connected to the controlled terminal of the second switching element 122; the fifth connection terminal of the second switching element 122 is a second signal terminal of the switching module 12, and is connected to the input terminal of the gain amplifying module 13; the sixth connection terminal of the second switching element 122 is the third signal terminal of the switch module 12, and the sixth connection terminal of the second switching element 122 is grounded.
When the working state of any one of the infrared emitting pieces on the infrared touch panel is the emitting state, after the first switch element 121 receives a signal for indicating the switch to be turned on and off by the switch on-off control signal K, the first switch element 121 is turned on, the third connecting end of the first switch element 121 is connected with the fourth connecting end of the first switch element 121, so that the second switch element 122 is controlled by the switch lamp control signal TEN, and further the gain amplifying module 13 can be controlled to be turned on and off by the switch lamp control signal TEN and is controlled by the infrared emission gain control signal V_TAGC to adjust the current signal.
When the working states of all the infrared emission parts on the infrared touch panel are not emission states, after the first switch element 121 receives a signal for indicating that the switch is turned off by the switch on-off control signal K, the first switch element 121 is turned off, so that the second switch element 122 is turned on, the input end of the gain amplification module 13 is grounded, and the gain amplification module 13 is in a cut-off state, so that no matter how the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN change, the gain amplification module 12 is not affected, and further, the current signal of the infrared emission matrix is not changed due to the change of the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, and interference on infrared receiving signals on the same panel is reduced.
In an alternative embodiment, referring to fig. 6, the fourth connection terminal of the first switching element 121 is further connected to the reference power VCC via the third resistor RG11 to realize stable control of the second switching element 122.
Referring to fig. 7, in another alternative embodiment, the switch module 12 includes a first switch element 121 and a second switch element 122.
The controlled end of the first switch element 121 is the controlled end of the switch module 12, and is used for receiving a switch on-off control signal K of the infrared touch panel; the third connection terminal of the first switching element 121 is a third signal terminal of the switching module 12; the third connection terminal of the first switching element 121 is grounded; the fourth connection terminal of the first switching element 121 is connected to the fifth connection terminal of the second switching element 122.
The controlled end of the second switching element 122 is a first signal end of the switching module 12, and is configured to receive a switching lamp control signal TEN; the fifth connection terminal of the second switching element 122 is a second signal terminal of the switching module 12, and is connected to the input terminal of the gain amplifying module 13; the sixth connection of the second switching element 122 is grounded.
When the working state of any one of the infrared emitting elements on the infrared touch panel is the emitting state, after the first switch element 121 receives a signal for indicating the switch to be turned off by the switch on-off control signal K, the first switch element 121 is turned off, so that the gain amplifying module 13 can be controlled to be turned on and off by the switch lamp control signal TEN and is controlled to be turned on and off by the infrared emitting gain control signal V_TAGC to adjust the current signal.
When the working states of all the infrared emitting pieces on the infrared touch panel are not the emitting states, the first switch element 121 is turned on after the on-off switch control signal K is used for indicating the switch to be turned on, so that the fourth connecting end of the first switch element 121 is connected to the ground end through the third connecting end, and the fifth connecting end of the second switch element 122 is connected with the fourth connecting end of the first switch element 121, and the input end of the gain amplification module 13 is connected with the fifth connecting end of the second switch element 122, so that the input end of the gain amplification module 13 is grounded, and the gain amplification module 13 is in the cut-off state, so that no matter how the infrared emission gain control signal v_tagc and the switch lamp control signal TEN change, the effect on the gain amplification module 12 is not caused, and further, the current signal of the infrared emission matrix is not changed due to the change of the infrared emission gain control signal v_tagc and the switch lamp control signal TEN, so that interference on the infrared receiving signals on the same panel is reduced.
In an alternative embodiment, referring to fig. 8 or 9, the first switching element 121 includes a second fet QT4; the gate of the second field effect transistor QT4 is the controlled end of the first switching element 121; the drain or the source of the second field effect transistor QT4 is a third connection end of the first switching element 121; the source or drain of the second fet QT4 is a fourth connection terminal of the first switching element 121. The application uses the second field effect transistor QT4 as the first switching element 121 to improve the response efficiency of the first switching element 121 to the on-off control signal K of the switch.
In another alternative embodiment, referring to fig. 10, the first switching element 121 includes a second triode QT5, a fourth resistor RG13, and a first accelerating capacitor CZ2; the base of the second triode QT5 is connected via a fourth resistor RG13 and then serves as the controlled end of the first switching element 121; the first accelerating capacitor CZ2 is connected in parallel to two ends of the fourth resistor RG 13; the collector or emitter of the second transistor QT5 is the third connection of the first switching element 121; the emitter or collector of the second transistor QT5 is the fourth connection of the first switching element 121. The second triode QT5 is used as the first switching element 121, so that the circuit cost of the first switching element 121 for switching the on-off control signal K is reduced.
It should be understood that the first switch element 121 may be other switches or other device structures that can implement the solution of the present application, and the present application is not limited thereto.
In an alternative embodiment, referring to fig. 8 or 9, the second switching element 122 includes a third fet QT2; the gate of the third field effect transistor QT2 is the controlled end of the second switching element 122; the drain or the source of the third field effect transistor QT2 is a fifth connection terminal of the second switching element 122; the source or drain of the third fet QT2 is the sixth connection terminal of the second switching element 122. The application uses the third field effect transistor QT 2as the second switching element 122 to improve the response efficiency of the second switching element 122 to the switching on/off control signal K and the switching lamp control signal.
In another alternative embodiment, referring to fig. 10, the second switching element 122 includes a third transistor QT6, a fifth resistor RG12 and a second accelerating capacitor CZ1. The base of the third transistor QT6 is used as the controlled end of the second switching element 122 after passing through the fifth resistor RG 12; the second accelerating capacitor CZ1 is connected in parallel to two ends of the fifth resistor RG 12; the collector or emitter of the third transistor QT6 is the fifth connection of the second switching element 122; the emitter or collector of the third transistor QT6 is the sixth connection of the second switching element 122. The third triode QT6 is used as the second switching element 122 in the embodiment of the application, so that the circuit cost of the second switching element 122 for switching the on-off control signal K is reduced.
It should be understood that the second switching element 122 may be other switches or other device structures that may implement the aspects of the present application, and the present application is not limited thereto.
Referring to fig. 8 to 10, in an alternative embodiment, the gain amplifying module 13 includes a gain amplifying element and a sixth resistor RG10.
The input end of the gain amplifying element is the input end of the gain amplifying module 13, and the input end of the gain amplifying element is connected with the output end of the voltage buffer module 11 through a sixth resistor RG 10; the common end of the gain amplifying piece is the common end of the gain amplifying module; the output end of the gain amplifying piece is the output end of the gain amplifying piece.
The amplifying element comprises a fourth triode QT1; the base level of the fourth triode QT1 is the input end of the gain amplifying piece; the collector or the emitter of the fourth triode QT1 is the output end of the gain amplifying piece; the emitter or collector of the fourth transistor QT1 is the common terminal of the gain amplifier.
Or the gain amplifying piece comprises a fourth field effect transistor; the grid electrode of the fourth field effect transistor is the input end of the gain amplifying piece; the drain electrode or the source electrode of the fourth field effect transistor is the output end of the gain amplifying piece; the source electrode or the drain electrode of the fourth field effect transistor is a common end of the gain amplifying element.
It should be understood that the gain amplifier may also be other amplifying structures, such as an amplifying chip, etc., and the present application is not limited thereto.
Referring to fig. 11, the embodiment of the present application further provides an interactive tablet 40 including an infrared touch frame 41, and the infrared emitting circuit of the embodiment of the present application is identical to the aforementioned structure, and is not described herein.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (16)
1. An infrared touch frame comprises at least two infrared touch panels which are connected with each other; the infrared touch panel is characterized in that an infrared emission circuit and an infrared receiving circuit are arranged on each infrared touch panel, and each infrared emission circuit comprises a voltage buffer module, a switch module, a gain amplifying module and a plurality of infrared emission pieces; the infrared emission pieces are connected with each other to form an infrared emission matrix;
The input end of the voltage buffer module is connected with the analog signal bus and is used for receiving an infrared emission gain control signal; the output end of the voltage buffer module is connected to the input end of the gain amplifying module;
The controlled end of the switch module is used for receiving a switch on-off control signal; the first signal end of the switch module is used for receiving a switch lamp control signal of the infrared emission piece; the second signal end of the switch module is connected to the input end of the gain amplifying module; the third signal end of the switch module is grounded; wherein, the on-off control signal of the switch is determined based on the working state of an infrared emission piece on the infrared touch panel;
the output end of the gain amplification module is connected to a power signal bus through the infrared emission matrix; the common ground of the gain amplification modules is grounded.
2. The infrared touch frame of claim 1, wherein: the first signal end of the switch module is connected with the synchronous signal bus and is used for receiving synchronous signals; the synchronization signal includes a switch light control signal.
3. The infrared touch frame of claim 1, wherein:
the infrared touch pad further comprises a controller;
The input end of the controller is connected with the synchronous signal bus and is used for receiving synchronous signals; the controller determines the switch lamp control signal of the infrared emission piece based on the synchronous signal;
The first signal end of the switch module is connected with the first output end of the controller and is used for receiving the switch lamp control signal sent by the controller.
4. The infrared touch frame of claim 1, wherein:
the infrared touch pad further comprises a controller;
The input end of the controller is connected with the synchronous signal bus and is used for receiving synchronous signals; the controller determines the working state of each infrared emitting piece on the infrared touch panel based on the synchronous signals; determining the on-off control signal of the switch based on the working state of each infrared emitting piece on the infrared touch panel;
the controlled end of the switch module is connected with the second output end of the controller and is used for receiving the switch on-off control signal sent by the controller.
5. The infrared touch frame of claim 4, wherein:
When the controller determines that the working state of any infrared emitting piece on the infrared touch panel is an emitting state according to the synchronous signal, the second signal end of the switch module is controlled to be conducted with the first signal end of the switch module through the switch on-off control signal, so that the gain amplification module is controlled to be turned on or off by the switch lamp control signal, and the current signal is controlled to be regulated by the infrared emission gain control signal;
And when the controller determines that the working states of all infrared emission pieces on the infrared touch panel are not emission states according to the synchronous signals, the second signal end of the switch module is controlled to be conducted with the third signal end of the switch module through the switch on-off control signal, so that the gain amplification module is cut off, and the gain amplification module is not controlled by the switch lamp control signal and the infrared emission gain control signal.
6. The infrared touch frame of claim 1, wherein: when the switch module of one infrared touch panel is conducted and works, the switch modules of the other infrared touch panels are cut off.
7. The infrared touch frame of claim 1, wherein:
the switch module comprises a first switch element and a second switch element;
The controlled end of the first switch element is the controlled end of the switch module; the third connecting end of the first switching element is a first signal end of the switching module; a fourth connection terminal of the first switching element is connected to a controlled terminal of the second switching element; the fifth connecting end of the second switching element is a second signal end of the switching module; the sixth connection end of the second switching element is a third signal end of the switching module.
8. The infrared touch frame of claim 7, wherein: the fourth connection terminal of the first switching element is also connected to a reference power supply via a third resistor.
9. The infrared touch frame of claim 1, wherein:
the switch module comprises a first switch element and a second switch element;
The controlled end of the first switch element is the controlled end of the switch module; the third connecting end of the first switching element is a third signal end of the switching module; the fourth connecting end of the first switching element is connected with the fifth connecting end of the second switching element;
the controlled end of the second switch element is a first signal end of the switch module; the fifth connecting end of the second switching element is a second signal end of the switching module; the sixth connection terminal of the second switching element is grounded.
10. The infrared touch frame according to any one of claims 7 to 9, wherein:
the first switching element comprises a second field effect transistor; the grid electrode of the second field effect transistor is the controlled end of the first switching element; the drain electrode or the source electrode of the second field effect transistor is a third connecting end of the first switching element; the source electrode or the drain electrode of the second field effect transistor is a fourth connecting end of the first switching element;
Or alternatively
The first switching element comprises a second triode, a fourth resistor and a first accelerating capacitor; the base stage of the second triode is connected through the fourth resistor and then used as a controlled end of the first switching element; the first accelerating capacitor is connected to two ends of the fourth resistor in parallel; the collector electrode or the emitter electrode of the second triode is a third connecting end of the first switching element; and an emitter electrode or a collector electrode of the second triode is a fourth connecting end of the first switching element.
11. The infrared touch frame according to claim 8 or 9, wherein:
The second switching element comprises a third field effect transistor; the gate of the third field effect transistor is the controlled end of the second switching element; the drain electrode or the source electrode of the third field effect transistor is a fifth connecting end of the second switching element; the source electrode or the drain electrode of the third field effect transistor is a sixth connecting end of the second switching element;
Or alternatively
The second switching element comprises a third triode, a fifth resistor and a second accelerating capacitor; the base stage of the third triode is used as a controlled end of the second switching element after passing through the fifth resistor; the second accelerating capacitor is connected to two ends of the fifth resistor in parallel; the collector electrode or the emitter electrode of the third triode is a fifth connecting end of the second switching element; and an emitter electrode or a collector electrode of the third triode is a sixth connection end of the second switching element.
12. The infrared touch frame according to any one of claims 1 to 9, wherein:
The voltage buffer module comprises a voltage buffer element, a first resistor and a second resistor;
The input end of the voltage buffer element is the input end of the voltage buffer module; the first connecting end of the voltage buffer element is connected with the first end of the first resistor, and the second end of the first resistor is a common end of the voltage buffer module; the second connecting end of the voltage buffer element is an output end of the voltage buffer module, and the second connecting end of the voltage buffer element is grounded after passing through the second resistor.
13. The infrared touch frame of claim 12, wherein:
The voltage buffer element comprises a first field effect transistor; the grid electrode of the first field effect transistor is the input end of the voltage buffer element; the drain electrode or the source electrode of the first field effect transistor is a first connecting end of the voltage buffer element; the source electrode or the drain electrode of the first field effect transistor is a second connecting end of the voltage buffer element;
Or alternatively
The voltage buffer element comprises a first triode; the base stage of the first triode is the input end of the voltage buffer element; the collector electrode or the emitter electrode of the first triode is a first connecting end of the voltage buffer element; the emitter or the collector of the first triode is a second connecting end of the voltage buffer element.
14. The infrared touch frame according to any one of claims 1 to 9, wherein:
the gain amplifying module comprises a gain amplifying piece and a sixth resistor;
The input end of the gain amplifying part is the input end of the gain amplifying module and is connected with the output end of the voltage buffer module through the sixth resistor; the common end of the gain amplifying piece is the common end of the gain amplifying module; the output end of the gain amplifying piece is the output end of the gain amplifying piece.
15. The infrared touch frame of claim 14, wherein:
The gain amplifying piece comprises a fourth triode; the base level of the fourth triode is the input end of the gain amplifying piece; the collector electrode or the emitter electrode of the fourth triode is the output end of the gain amplifying piece; the emitter electrode or the collector electrode of the fourth triode is a common end of the gain amplifying piece;
Or alternatively
The gain amplification module comprises a fourth field effect transistor; the grid of the fourth field effect transistor is the input end of the gain amplifying element; the drain electrode or the source electrode of the fourth field effect transistor is the output end of the gain amplifying piece; and the source electrode or the drain electrode of the fourth field effect transistor is a common end of the gain amplifying element.
16. An interactive tablet comprising the infrared touch frame of any one of claims 1-15.
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| CN202410931825.9A CN118466790A (en) | 2024-07-12 | 2024-07-12 | Infrared touch frame and interactive panel |
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| CN202410931825.9A CN118466790A (en) | 2024-07-12 | 2024-07-12 | Infrared touch frame and interactive panel |
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