Infrared emission circuit and interactive panel

Abstract

The embodiment of the utility model provides an infrared emission circuit and an interactive panel. The infrared emission circuit comprises a voltage buffer module, a switch module, a gain amplification module and a plurality of infrared emission parts, the input end of the voltage buffer module is connected with an analog signal bus so as to receive an infrared emission gain control signal; the output end of the voltage buffer module is connected with the input end of the gain amplification module; the controlled end of the switch module receives a switch on-off control signal; a first signal end of the switch module receives a lamp turning-on and turning-off control signal of the infrared emission part; a second signal end of the switch module is connected with an input end of the gain amplification module; the output end of the gain amplification module is connected to the power signal bus through an infrared emission matrix formed by connecting the infrared emission pieces, and the common end of the gain amplification module is grounded. According to the invention, the accuracy of infrared receiving signal detection can be improved, and the problem that the touch detection of the infrared touch frame is inaccurate or invalid is reduced.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of infrared signal processing, and in particular, to an infrared emission circuit and an interactive flat panel. Background Art

[0002] An infrared touch frame is provided with a plurality of infrared transmitters and a plurality of infrared receivers on four side frames of the frame body. The infrared transmitters are controlled by an infrared emission circuit to emit infrared signals, so that the infrared receivers obtain the infrared signals to obtain corresponding infrared reception signals. Then, after a series of stability adjustments and A / D (analog to digital converter) sampling and other processes on the infrared reception signals, it is determined whether an object blocks the infrared light by whether the processed infrared reception signals change, so as to judge the touch operation situation, etc.

[0003] Since there are other strong signals on the infrared touch panel at the same time, the detection of the infrared reception signals is inaccurate, which in turn leads to inaccurate or ineffective touch detection of the infrared touch frame. Summary of the Invention

[0004] To overcome the problems in the related art, the present application provides an infrared emission circuit and an interactive flat panel, which improve the accuracy of detecting infrared reception signals and reduce the problems of inaccurate or ineffective touch detection of the infrared touch frame.

[0005] According to a first aspect of the embodiments of the present application, an infrared emission circuit is provided, which is applied to an infrared touch panel. An infrared reception circuit is further provided on the infrared touch panel. The infrared reception circuit includes a plurality of infrared reception components. The infrared emission circuit includes a voltage buffer module, a switch module, a gain amplification module, and a plurality of infrared emission components; the plurality of infrared emission components are connected to each other to form an infrared emission matrix;

[0006] The input end of the voltage buffer module is connected to the analog signal bus 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 amplification module;

[0007] 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-on lamp control signal of the infrared emission component; the second signal end of the switch module is connected to the input end of the gain amplification module; the third signal end of the switch module is grounded; wherein, the switch on / off control signal is determined based on the working state of the infrared emission components on the infrared touch panel;

[0008] The output end of the gain amplification module is connected to the power signal bus via the infrared emission matrix; the common end of the gain amplification module is grounded.

[0009] According to the second aspect of the embodiments of the present application, an interactive flat panel is provided, including the infrared emission circuit described above.

[0010] In the present application, a voltage buffer module, a switch module, a gain amplification module, and several infrared emitters are provided in the infrared emission circuit. When the working state of any one infrared emitter on the infrared touch panel is the emission state, the gain amplification module on the infrared touch panel is controlled by an infrared emission gain control signal and a switch lamp control signal, so as to ensure the normal operation of the infrared emitter; when the working states of all the infrared emitters on the infrared touch panel are not in the emission state, the gain amplification module on the infrared touch panel is cut off, so that the current signal where the infrared emission matrix is located is not controlled by the infrared emission gain control signal and the switch lamp control signal, thereby improving the accuracy of infrared received signal detection and reducing the problem of inaccurate or ineffective touch detection of the infrared touch frame.

[0011] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application.

[0012] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a layout schematic diagram of infrared emitters and infrared receivers in the related art;

[0015] Figure 2 It is a layout schematic diagram of infrared emitters and infrared receivers in another related art;

[0016] Figure 3 It is a layout schematic diagram of an infrared touch panel in the related art;

[0017] Figure 4 It is a structural schematic diagram of an infrared emission circuit in the related art;

[0018] Figure 5 It is a schematic diagram of the infrared emission circuit shown in an embodiment of the present application;

[0019] Figure 6 It is a schematic diagram of the switch module shown in an embodiment of the present application;

[0020] Figure 7 Schematic diagram of the switch module shown in another embodiment of the present application;

[0021] Figure 8 Structural schematic diagram of the infrared emission circuit shown in an embodiment of the present application;

[0022] Figure 9 Structural schematic diagram of the infrared emission circuit shown in another embodiment of the present application;

[0023] Figure 10 Structural schematic diagram of the infrared emission circuit shown in yet another embodiment of the present application;

[0024] Figure 11 Structural schematic block diagram of the interactive flat panel shown in an embodiment of the present application. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings. Among them, when the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0026] It should be clear that the implementation manners described in the embodiments described below do not represent all implementation manners consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0027] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a" and "the" used in the present application are also intended to include the plural forms, unless the context clearly indicates otherwise. In addition, in the description of the present application, unless otherwise stated, "a plurality of" means two or more. It should also be understood that the term " / and / " used herein means and includes any or all possible combinations of one or more of the associated listed items. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the preceding and following associated objects.

[0028] It should be understood that although terms such as first, second, and third may be used in this application to describe various information, such information should not be limited to these terms. Moreover, these terms are only used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. Depending on the context, the words "if" / "when" used in this application can be interpreted as "when...", "while...", or "in response to a determination".

[0029] The infrared touch frame is provided with a plurality of infrared transmitters and a plurality of infrared receivers on the four side frames of the frame body. Then, the infrared transmitters are controlled by an infrared emission circuit to emit infrared signals, and the infrared receivers obtain the infrared signals to obtain corresponding infrared reception signals. Then, after a series of stability adjustments and A / D (analog-to-digital converter) sampling and other processing of the received signals, it is determined whether an object blocks the infrared light by whether the processed received signal changes, so as to judge the touch operation situation, etc.

[0030] Among them, in the related art, there are mainly two ways to set infrared emission components and infrared reception components on the four side frames of the infrared touch frame: as Figure 1 shown, one is that the infrared emission components and the infrared reception components are respectively arranged on opposite sides of the touch frame; as Figure 2 shown, the other is that the infrared emission components and the infrared reception components are arranged in an interleaved manner on the same side of the touch frame, where Figure 1 and Figure 2 in, the white circles represent the infrared emission components, and the black circles represent the infrared reception components.

[0031] Specifically, please refer to Figure 3 and set a plurality of infrared touch panels 100 on the four side frames of the infrared touch frame. According to different functions and positions, the plurality of 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 synchronization signal bus, and a power signal bus are connected between the main board and the slave boards.

[0032] The main board and the slave boards share the power signal bus to provide power signals, that is, power supplies, for the infrared emission components and the infrared reception components connected to them respectively.

[0033] Before the start of scanning, the main board sends the scanning data for controlling the infrared emitting components to each slave board through the digital signal bus; each slave board shares the digital signal bus to obtain its own scanning data respectively, and controls its own infrared emitting components to perform scanning work according to its own scanning data. Among them, the scanning data includes the position information of the infrared receiving lamps and infrared emitting lamps connected to this slave board and the corresponding scanning logic, etc.

[0034] After the start of scanning, the main board transmits a synchronization signal to each slave board through the synchronization signal bus to control the corresponding slave board to perform scanning. Specifically, after receiving the synchronization signal sent by the main board, the slave board is triggered to start executing scanning according to the synchronization signal, reads the scanning data saved by itself, and controls the working states of the infrared receiving components and infrared emitting components connected thereto according to the synchronization signal. Among them, the type of the synchronization signal bus can be an analog signal bus or a digital signal bus.

[0035] Meanwhile, the main board transmits an infrared emission gain control signal to each slave board through the analog signal bus to control the emission power of the infrared emitting components on the corresponding slave board.

[0036] Each slave board shares the analog signal bus to load the analog electrical signal corresponding to the infrared signal received by the infrared receiving component (hereinafter referred to as "infrared receiving signal") onto the analog signal bus and transmit it to the main board; the main board detects the infrared receiving signal from the analog signal bus and converts the infrared receiving signal into a digital signal; among them, the digital signal is used to calculate the coordinate position of the touch object.

[0037] It should be understood that the above-mentioned analog signal bus and digital signal bus are a group of transmission wire harnesses composed of multiple lines. When different signals are transmitted through the analog signal bus or digital signal bus at the same time, these different signals are allocated to different channels or wires for transmission. For example, when the type of the synchronization signal bus is an analog signal bus, when the analog signal bus transmits the synchronization signal, infrared emission gain control signal, and infrared receiving signal at the same time, the analog signal bus allocates the synchronization signal, infrared emission gain control signal, and infrared receiving signal to different channels or wires for transmission.

[0038] Next, for the case where the infrared emitting components and infrared receiving components are arranged alternately on the same side of the touch frame, the principle of interference of the received signal will be described in combination with the structure of the infrared touch panel.

[0039] Please refer to Figure 3 and Figure 4, on each infrared touch panel 100 (main board and slave board), an infrared emission circuit 101 and an infrared reception circuit 102 are respectively provided. The infrared emission circuit 101 includes a voltage buffer QT3, a switching element QT2, a gain amplifier QT1, and a plurality of infrared emitters (not shown in the figure); the plurality of infrared emitters are interconnected to form an infrared emission matrix; the infrared reception circuit includes a plurality of infrared receivers (not shown in the figure).

[0040] The input terminal of the voltage buffer QT3 is connected to the analog signal bus 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 RG10.

[0041] The controlled terminal of the switching element QT2 is connected to the synchronization signal bus for receiving a synchronization signal; the first signal terminal of the switching element QT2 is grounded; the second signal terminal of the switching element QT2 is connected to the input terminal of the gain amplifier QT1. The output terminal of the gain amplifier QT1 is connected to the power signal bus PWR via the infrared emission matrix; the common terminal of the gain amplifier QT1 is grounded. The synchronization signal includes a switch lamp control signal for controlling whether each infrared emitter on the infrared touch panel 100 operates.

[0042] Although only one infrared emitter on one infrared touch panel operates at the same time, however, since a plurality of infrared emitters are provided on the infrared touch panel, therefore, if any one of the infrared emitters on the infrared touch panel operates, the infrared touch panel is considered to be in the emission state, and if all the infrared emitters on the infrared touch panel do not operate, the infrared touch panel is considered to be in the non-emission state.

[0043] Then, for the infrared touch panel in the emission state, the gain amplification module on the infrared touch panel amplifies the infrared emission gain control signal according to the infrared emission gain control signal and the synchronization signal, and then drives the infrared emitters in the infrared emission matrix of the infrared touch panel to operate, so that the power signal on the infrared emission matrix changes sharply. For the infrared touch panel in the non-emission state, its infrared emission circuit 101 includes a voltage buffer QT3, a switching element QT2, and a gain amplifier QT1, and will also amplify the infrared emission gain control signal under the control of the infrared emission gain control signal and the synchronization signal. Moreover, the coupling path between the trace of the infrared emission circuit 101 in the infrared touch panel and the analog signal bus is too long, so that the infrared reception signal received by the infrared receivers on the infrared touch panel in the non-emission state will also be crosstalked by the infrared emission circuit 101, and the crosstalk of the infrared emission circuits 101 of multiple infrared touch panels will also have a superimposed effect on the infrared reception signal.

[0044] It can be understood that crosstalk refers to the noise on the line caused by the coupling, mutual inductance or mutual capacitance between two signal lines. Specifically, when two signal lines transmit different signals, even if they do not come into contact, due to the interaction of the electric field (capacitive coupling) and the magnetic field (inductive coupling), a small signal is induced in the adjacent signal line, which in turn causes interference to the signal detected by the adjacent signal line.

[0045] In the infrared emission circuit provided by the embodiment of the present application, when the working state of any infrared emitter 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 changes of the infrared emission gain control signal and the switch lamp control signal, thereby ensuring the normal operation of the infrared emitter; when the working states of all the infrared emitters on the infrared touch panel are not in the emission state, 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 where the infrared emission matrix is located does not change according to the changes of the infrared emission gain control signal and the switch lamp control signal, that is, the infrared emission circuit on the infrared touch panel remains unchanged, thereby reducing the interference to the infrared reception signal, especially reducing the interference to the infrared reception signal on the same infrared touch panel, thereby improving the accuracy of the infrared reception signal detection and reducing the problems of inaccurate or ineffective touch detection of the infrared touch frame.

[0046] The following will combine with the attached Figures 5 to 10 , and introduce the infrared emission circuit provided by the embodiment of the present application in detail.

[0047] Please refer to Figure 5 , the infrared emission circuit provided by the embodiment of the present application includes a voltage buffer module 11, a switch module 12, a gain amplification module 13 and a plurality of infrared emitters; the plurality of infrared emitters are connected to each other to form an infrared emission matrix 14.

[0048] The input end of the voltage buffer module 11 is connected to the analog signal bus for receiving the infrared emission gain control signal V_TAGC; the common end of the voltage buffer module 11 is connected to the reference power supply VCC; the output end of the voltage buffer module 11 is connected to the input end of the gain amplification module 13.

[0049] The controlled end of the switch module 12 is used for receiving the switch on / off control signal K; the first signal end of the switch module 12 is used for receiving the switch lamp control signal TEN of the infrared emitter; the second signal end of the switch module 12 is connected to the input end of the gain amplification module 13; the third signal end of the switch module 12 is grounded.

[0050] The output end of the gain amplification module 13 is connected to the power signal bus via the infrared emission matrix 14; the common end of the gain amplification module 13 is grounded.

[0051] It should be noted that the infrared emission circuit of the embodiment of the present application is applied to an infrared touch panel. The infrared touch frame where the infrared touch panel is located includes at least two infrared touch panels. Each infrared touch panel is further provided with an infrared reception circuit, and the infrared reception circuit includes a plurality of infrared receivers. That is to say, on the same infrared touch panel, there are both infrared emitters and infrared receivers. In one embodiment, when the switch module of one of the infrared touch panels is turned on and working, the switch modules of other infrared touch panels are turned off. That is, only the switch module of one infrared touch panel works at the same time, so as to prevent when all the infrared emitters on other infrared touch panels do not work, under the control of the infrared emission gain control signal and the infrared lamp control signal, the infrared emission gain control signal is amplified. At the same time, it also prevents the coupling path between the wiring of the infrared emission circuit in the infrared touch panel and the analog signal bus from being too long, resulting in the superposition effect of crosstalk of the infrared emission circuits of multiple infrared touch panels on the infrared reception signal.

[0052] The switch on-off control signal K is a control signal sent by the infrared touch panel, and the switch on-off control signal K is a signal determined based on the working state of the infrared emitters on the infrared touch panel.

[0053] Specifically, when the working state of any one of the infrared emitters on the infrared touch panel is the emission state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal terminal of the switch module 12 is conducted with the first signal terminal, so that the gain amplification module 13 can be controlled by the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC. When the working states of all the infrared emitters on the infrared touch panel are not in the emission state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal terminal of the switch module 12 is conducted with the third signal terminal, and then the input end of the gain amplification module 13 is grounded, so that the gain amplification module 13 is turned 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.

[0054] It should be understood that since the switch on-off control signal K is a control signal sent by the infrared touch panel itself and the wiring is extremely short, the influence on the received signal of the infrared receiver is small and can be ignored.

[0055] The working principle of the embodiment of the present application is specifically described below:

[0056] When the working state of any one of the infrared emitters on the infrared touch panel is the emission state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal terminal of the switch module 12 is conducted with the first signal terminal of the switch module 12, enabling the gain amplification module 13 to be controlled by the switch lamp control signal TEN for on-off, and being controlled by the infrared emission gain control signal V_TAGC to adjust the magnitude of the current signal, so that the power signal PWR where the infrared emission matrix 14 is located changes according to the changes of the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, enabling the infrared emitter to work normally. Generally, only one infrared touch panel works at the same time. Therefore, at this time, actually only the power signal where the infrared emission matrix 14 on one infrared touch panel changes, and the interference path between this power signal and the infrared reception signal on the same infrared touch panel is relatively short, and the interference effect on the infrared reception signal is also relatively small.

[0057] When the working states of all the infrared emitters on the infrared touch panel are not in the emission state, the infrared touch panel controls the switch module 12 through the switch on-off control signal K, so that the second signal terminal of the switch module 12 is conducted with the third signal terminal of the switch module 12, and then the input terminal of the gain amplification module 13 is grounded, thereby making the gain amplification module 13 cut off. At this time, the gain amplification module 13 is not controlled by the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC, that is, the gain amplification module 13 does not change due to the changes of the switch lamp control signal TEN and the infrared emission gain control signal V_TAGC, and then the power signal where the infrared emission matrix 14 is located remains unchanged, and the power signal on the infrared emission matrix does not change either, reducing the interference to the infrared reception signal on the infrared touch panel, especially reducing the interference to the infrared reception signal on the same infrared touch panel.

[0058] In the embodiment of the present application, a voltage buffer module 11, a switch module 12, a gain amplification module 13, and several infrared emitters are provided in the infrared emission circuit. Furthermore, when the working state of any one infrared emitter on the infrared touch panel is the 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 as to ensure the normal operation of the infrared emitters on the infrared touch frame panel; when the working states of all the infrared emitters on the infrared touch panel are not in the emission state, the gain amplification module 13 is turned off, and then the current signal where the infrared emission matrix is located is not controlled by the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, so that the infrared emission circuit on the infrared touch panel on the infrared touch frame panel remains unchanged, that is, the power signal on the infrared emission matrix no longer changes sharply, reducing the interference to the infrared reception signal on the infrared touch panel, and further reducing the interference to the infrared reception signal on the same infrared touch panel, improving the accuracy of infrared reception signal detection, and reducing the problems of inaccurate or ineffective infrared touch frame touch detection.

[0059] In one embodiment, the switch lamp control signal TEN is directly determined by a synchronization signal. Specifically, the first signal terminal of the switch module 12 is connected to the synchronization signal bus for receiving the synchronization signal; the synchronization signal includes the switch lamp control signal TEN.

[0060] Among them, it should be understood that the synchronization signal is used to control the working states of the infrared emitters of each infrared touch panel.

[0061] In order to avoid interference to other signals when the synchronization signal is transmitted through the synchronization signal bus. For this reason, when one infrared touch panel (main board) transmits the synchronization signal, the synchronization signal is first attenuated by a signal attenuation circuit, and then the attenuated synchronization signal is transmitted to other infrared touch panels (slave boards) through the synchronization signal bus; after receiving the attenuated synchronization signal, the other infrared touch panels (slave boards) perform amplification and restoration processing through a signal conditioning circuit to obtain the restored synchronization signal.

[0062] In the embodiment of the present application, the synchronization signal includes the switch lamp control signal TEN. At this time, the synchronization signal has been attenuated when it is on the main board and then transmitted, so the change of the synchronization signal has little impact on the infrared reception signal during the transmission process and can be ignored. Moreover, amplification and restoration processing are performed on the slave board, which does not affect the driving force of the signal itself. Therefore, by using the synchronization signal as the switch lamp control signal TEN, the impact on the infrared reception signal can be reduced.

[0063] In another alternative embodiment, the switch-on and switch-off control signal TEN of the infrared touch panel is determined by the controller of the infrared touch panel based on the synchronization signal. Specifically, the infrared emission circuit further includes a controller; the input end of the controller is connected to the synchronization signal bus for receiving the synchronization signal; the controller determines the switch-on and switch-off control signal TEN of the infrared emission element based on the synchronization signal; the first signal end of the switch module 12 is connected to the first output end of the controller for receiving the switch-on and switch-off control signal TEN sent by the controller.

[0064] It can be understood that other infrared touch panels (slave boards) receive the attenuated synchronization signal, perform amplification and restoration processing, and then distribute the restored synchronization signal to their own controllers. The controllers send the infrared emission element row and column control signals to the infrared emission matrix according to the synchronization signal, and then control the operation of each infrared emission element in the infrared emission element matrix by the infrared emission element row and column control signals. Moreover, the controller determines the switch-on and switch-off control signal TEN of the infrared emission element on the infrared touch panel according to the synchronization signal, which can further shorten the coupling path of the wiring between the synchronization signal bus and the infrared emission circuit 101 in the infrared touch panel, thereby further reducing the interference to the infrared received signal.

[0065] In an alternative embodiment, the switch-on and switch-off control signal K is determined by the infrared touch panel based on the synchronization signal. Specifically, the infrared emission circuit further includes a controller; the input end of the controller is connected to the synchronization signal bus for receiving the synchronization signal; the controller determines the operating state of the infrared emission element on the infrared touch panel based on the synchronization signal, and determines the switch-on and switch-off control signal K based on the operating state of the infrared emission element on the infrared touch panel; the controlled end of the switch module 12 is connected to the second output end of the controller for receiving the switch-on and switch-off control signal K sent by the controller.

[0066] It can be understood that other infrared touch panels (slave boards) receive the attenuated synchronization signal, perform amplification and restoration processing, and then distribute the restored synchronization signal to their own controllers. The controllers send the infrared emission element row and column control signals to the infrared emission matrix according to the synchronization signal, and then control the operation of each infrared emission element in the infrared emission element matrix by the infrared emission element row and column control signals. Moreover, the controller determines the switch-on and switch-off control signal K according to the synchronization signal to control the on and off of the switch module 12. That is to say, the switch-on and switch-off control signal K in the embodiment of the present application is the control signal of the infrared touch panel itself, and the wiring is extremely short, and the interference to the received signal has little impact and can be ignored.

[0067] In the embodiment of the present application, the controller on the infrared touch panel determines the working state of the infrared emitter on the infrared touch panel according to the synchronization signal, and then determines the switch on / off control signal K based on the working state of the infrared emitter on the infrared touch panel to control the switch module 12, which can reduce the control complexity, shorten the control trace, and reduce the interference to the infrared reception signal.

[0068] In an optional embodiment, when the controller determines that the working state of any one infrared emitter on the infrared touch panel is the emission state according to the synchronization signal, it determines that the infrared touch panel is in the emission state, and controls the switch module 12 through the switch on / off control signal K to make the second signal terminal of the switch module 12 conduct with the first signal terminal of the switch module 12, so that the gain amplification module 13 is controlled by the switch lamp control signal TEN to turn on and off. The gain amplification module 13 is controlled by the infrared emission gain control signal V_TAGC to adjust the magnitude of the current signal to ensure the normal operation of the infrared emitter on the infrared touch panel. If the controller determines that the working states of all the infrared emitters on the infrared touch panel are not in the emission state according to the synchronization signal, it determines that the infrared touch panel is in the non-emission state, and controls the switch module 12 through the switch on / off control signal K to make the second signal terminal of the switch module 12 conduct with the third signal terminal of the switch module 12, and ground the gain amplification module 13, so that the gain amplification module 13 is turned 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, and keeps the infrared emission circuit on the infrared touch panel on the infrared touch frame unchanged, that is, the power signal on the infrared emission matrix no longer changes, thereby reducing the interference to the infrared reception signal on the same infrared touch panel.

[0069] Please refer to Figure 8 , in an optional embodiment, the voltage buffer module 11 includes a voltage buffer element QT3, a first resistor RG9, and a second resistor RG8.

[0070] The input end of the voltage buffer element QT3 is the input end of the voltage buffer module 11, which is connected to the analog signal bus and is used to receive the infrared emission gain control signal V_TAGC; the first connection end of the voltage buffer element QT3 is connected to the first end of the first resistor RG9, and the second end of the first resistor RG9 is the common end of the voltage buffer module 11 and is used to be connected to the reference power supply VCC; the second connection end of the voltage buffer element QT3 is the output end of the voltage buffer module 11, which is connected to the input end of the gain amplification module 13, and the second connection end of the voltage buffer element QT3 is also grounded through the second resistor RG8.

[0071] The voltage buffer element QT3, the first resistor RG9, and the second resistor RG8 amplify the infrared emission gain control signal V_TAGC to increase the driving ability of the infrared emission gain control signal V_TAGC on the gain amplification module, enabling the gain amplification module to respond in a timely manner according to the infrared emission gain control signal V_TAGC and improving the accuracy of detecting the infrared reception signal.

[0072] It should be understood that the voltage buffer module 11 may also be other device structures such as an integrated voltage buffer chip that can implement the solution of this application, and this application does not impose any restrictions.

[0073] Among them, the voltage buffer element QT3 is a first field-effect transistor; the gate of the first field-effect transistor is the input end of the voltage buffer element QT3; the drain or source of the first field-effect transistor is the first connection end of the voltage buffer element QT3; the source or drain of the first field-effect transistor is the second connection end of the voltage buffer element QT3.

[0074] Alternatively, the voltage buffer element QT3 is a first triode; the base of the first triode is the input end of the voltage buffer element QT3; the collector or emitter of the first triode is the first connection end of the voltage buffer element QT3; the emitter or collector of the first triode is the second connection end of the voltage buffer element QT3.

[0075] It can be understood that the voltage buffer element QT3 may also be other device structures such as a voltage buffer element that can implement the solution of this application, and this application does not impose any restrictions.

[0076] Please refer to Figure 6 , in an optional embodiment, the switch module 12 includes a first switch element 121 and a second switch element 122.

[0077] The controlled end of the first switch element 121 is the controlled end of the switch module 12 and is used to receive the switch on / off control signal K of the infrared touch panel; the third connection end of the first switch element 121 is the first signal end of the switch module 12 and is used to receive the switch lamp control signal TEN; the fourth connection end of the first switch element 121 is connected to the controlled end of the second switch element 122; the fifth connection end of the second switch element 122 is the second signal end of the switch module 12 and is connected to the input end of the gain amplification module 13; the sixth connection end of the second switch element 122 is the third signal end of the switch module 12, and the sixth connection end of the second switch element 122 is grounded.

[0078] Specifically, when the working state of any one of the infrared emitters on the infrared touch panel is the emitting state, after the first switching element 121 receives the switch-on / off control signal K, which is a signal indicating switch closure, the first switching element 121 is turned on. The third connection terminal of the first switching element 121 is connected to the fourth connection terminal of the first switching element 121, so that the second switching element 122 is controlled by the switch lamp control signal TEN. Furthermore, the gain amplification module 13 can be controlled by the switch lamp control signal TEN to control its on / off state, and is controlled by the infrared emission gain control signal V_TAGC to adjust the magnitude of the current signal.

[0079] When the working states of all the infrared emitters on the infrared touch panel are not in the emitting state, after the first switching element 121 receives the switch-on / off control signal K, which is a signal indicating switch opening, the first switching element 121 is turned off, causing the second switching element 122 to conduct. As a result, the input terminal of the gain amplification module 13 is grounded, and the gain amplification module 13 is in the cut-off state. In this way, no matter how the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN change, they will not affect the gain amplification module 12. Furthermore, the current signal of the infrared emission matrix will not change due to the changes in the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, thereby reducing the interference with the infrared reception signal on the same board.

[0080] In an alternative embodiment, please continue to refer to Figure 6 , the fourth connection terminal of the first switching element 121 is also connected to the reference power supply VCC via the third resistor RG11 to achieve stable control of the second switching element 122.

[0081] Please refer to Figure 7 , in another alternative embodiment, the switch module 12 includes a first switching element 121 and a second switching element 122.

[0082] The controlled terminal of the first switching element 121 is the controlled terminal of the switch module 12, which is used to receive the switch-on / off control signal K of the infrared touch panel; the third connection terminal of the first switching element 121 is the third signal terminal of the switch 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.

[0083] The controlled terminal of the second switching element 122 is the first signal terminal of the switch module 12, which is used to receive the switch lamp control signal TEN; the fifth connection terminal of the second switching element 122 is the second signal terminal of the switch module 12, which is connected to the input terminal of the gain amplification module 13; the sixth connection terminal of the second switching element 122 is grounded.

[0084] Specifically, when the working state of any one of the infrared emitters on the infrared touch panel is the emitting state, after the first switching element 121 receives the switch on / off control signal K, which is a signal indicating that the switch is turned off, the first switching element 121 is turned off, enabling the gain amplification module 13 to be controlled to be turned on and off by the switch lamp control signal TEN and to adjust the magnitude of the current signal under the control of the infrared emission gain control signal V_TAGC.

[0085] When the working states of all the infrared emitters on the infrared touch panel are not in the emitting state, after the first switching element 121 receives the switch on / off control signal K, which is a signal indicating that the switch is closed, the first switching element 121 is turned on, causing the fourth connection terminal of the first switching element 121 to be connected to the ground terminal via the third connection terminal. Since the fifth connection terminal of the second switching element 122 is connected to the fourth connection terminal of the first switching element 121, and the input terminal of the gain amplification module 13 is connected to the fifth connection terminal of the second switching element 122, the input terminal of the gain amplification module 13 will also be grounded, thus putting the gain amplification module 13 in the cut-off state. In this way, no matter how the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN change, they will not affect the gain amplification module 12, and further, the current signal of the infrared emission matrix will not change due to the changes of the infrared emission gain control signal V_TAGC and the switch lamp control signal TEN, thereby reducing the interference with the infrared reception signal on the same board.

[0086] In an alternative embodiment, please refer to Figure 8 or Figure 9 , the first switching element 121 includes a second field effect transistor QT4; the gate of the second field effect transistor QT4 is the controlled terminal of the first switching element 121; the drain or source of the second field effect transistor QT4 is the third connection terminal of the first switching element 121; the source or drain of the second field effect transistor QT4 is the fourth connection terminal of the first switching element 121. In this application, by using the second field effect transistor QT4 as the first switching element 121, the response efficiency of the first switching element 121 to the switch on / off control signal K is improved.

[0087] In another alternative embodiment, please refer to Figure 10, the first switching element 121 includes a second triode QT5, a fourth resistor RG13, and a first acceleration capacitor CZ2; the base of the second triode QT5 is connected via the fourth resistor RG13 and serves as the controlled terminal of the first switching element 121; the first acceleration capacitor CZ2 is connected in parallel across the two ends of the fourth resistor RG13; the collector or emitter of the second triode QT5 is the third connection terminal of the first switching element 121; the emitter or collector of the second triode QT5 is the fourth connection terminal of the first switching element 121. In the embodiment of the present application, by using the second triode QT5 as the first switching element 121, the circuit cost of the first switching element 121 for the switch-on and switch-off control signal K is reduced.

[0088] It should be understood that the first switching element 121 may also be other switches or other device structures that can implement the solution of the present application, and the present application does not impose any restrictions.

[0089] In an alternative embodiment, please refer to FIG. 8 or Figure 9 , the second switching element 122 includes a third field effect transistor QT2; the gate of the third field effect transistor QT2 is the controlled terminal of the second switching element 122; the drain or source of the third field effect transistor QT2 is the fifth connection terminal of the second switching element 122; the source or drain of the third field effect transistor QT2 is the sixth connection terminal of the second switching element 122. In the present application, by using the third field effect transistor QT2 as the second switching element 122, the response efficiency of the second switching element 122 to the switch-on and switch-off control signal K and the switch lamp control signal is improved.

[0090] In another alternative embodiment, please refer to Figure 10 , the second switching element 122 includes a third triode QT6, a fifth resistor RG12, and a second acceleration capacitor CZ1; the base of the third triode QT6 is connected via the fifth resistor RG12 and serves as the controlled terminal of the second switching element 122; the second acceleration capacitor CZ1 is connected in parallel across the two ends of the fifth resistor RG12; the collector or emitter of the third triode QT6 is the fifth connection terminal of the second switching element 122; the emitter or collector of the third triode QT6 is the sixth connection terminal of the second switching element 122. In the embodiment of the present application, by using the third triode QT6 as the second switching element 122, the circuit cost of the second switching element 122 for the switch-on and switch-off control signal K is reduced.

[0091] It should be understood that the second switching element 122 may also be other switches or other device structures that can implement the solution of the present application, and the present application does not impose any restrictions.

[0092] Please refer to Figures 8 to 10 , in an alternative embodiment, the gain amplification module 13 includes a gain amplification element and a sixth resistor RG10;

[0093] The input terminal of the gain amplification element is the input terminal of the gain amplification module 13, and the input terminal of the gain amplification element is connected to the output terminal of the voltage buffer module 11 via the sixth resistor RG10; the common terminal of the gain amplification element is the common terminal of the gain amplification module; the output terminal of the gain amplification element is the output terminal of the gain amplification module.

[0094] The gain amplification element includes a fourth triode QT1; the base of the fourth triode QT1 is the input terminal of the gain amplification element; the collector or emitter of the fourth triode QT1 is the output terminal of the gain amplification element; the emitter or collector of the fourth triode QT1 is the common terminal of the gain amplification element.

[0095] Alternatively, the gain amplification element includes a fourth field effect transistor; the gate of the fourth field effect transistor is the input terminal of the gain amplification element; the drain or source of the fourth field effect transistor is the output terminal of the gain amplification element; the source or drain of the fourth field effect transistor is the common terminal of the gain amplification element.

[0096] It should be understood that the gain amplification element may also be other amplification structures, such as an amplification chip, etc., and the present application does not limit it.

[0097] Please refer to Figure 11 , the embodiment of the present application also provides an interactive flat panel 40, including an infrared emission circuit 41. The infrared emission circuit in the embodiment of the present application is exactly the same as the foregoing structure and will not be described in detail herein.

[0098] It should also be noted that the term "including", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, commodity or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0099] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. An infrared transmitting circuit, applied to an infrared touch panel, wherein the infrared touch panel is also provided with an infrared receiving circuit, wherein the infrared receiving circuit includes a plurality of infrared receiving elements; characterized in that: The infrared emission circuit includes a voltage buffer module, a switch module, a gain amplifier module and a plurality of infrared emission elements; the plurality of infrared emission elements are interconnected to form an infrared emission matrix; The input end of the voltage buffer module is connected to the analog signal bus for receiving the infrared emission gain control signal; the output end of the voltage buffer module is connected to the input end of the gain amplification module; The controlled end of the switch module is used to receive a switch on / off control signal; the first signal end of the switch module is used to receive a switch light control signal of the infrared emitting element; the second signal end of the switch module is connected to the input end of the gain amplifier module; the third signal end of the switch module is grounded; wherein the switch on / off control signal is determined based on the working state of the infrared emitting element on the infrared touch panel; The output end of the gain amplification module is connected to a power signal bus via the infrared emission matrix; and the common end of the gain amplification module is grounded.

2. The infrared transmitting circuit according to claim 1, characterized in that: The voltage buffer module includes 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 connection end of the voltage buffer element is connected to the first end of the first resistor, and the second end of the first resistor is the common end of the voltage buffer module; the second connection end of the voltage buffer element is the output end of the voltage buffer module, and the second connection end of the voltage buffer element is also grounded via the second resistor.

3. The infrared transmitting circuit according to claim 1, characterized in that: The gain amplification module includes a gain amplification element and a sixth resistor; The input end of the gain amplifier element is the input end of the gain amplifier module, and the input end of the gain amplifier element is connected to the output end of the voltage buffer module via the sixth resistor; the common end of the gain amplifier element is the common end of the gain amplifier module; and the output end of the gain amplifier element is the output end of the gain amplifier module.

4. The infrared transmitting circuit according to claim 1, characterized in that: The first signal end of the switch module is connected to the synchronization signal bus for receiving a synchronization signal; the synchronization signal includes a switch light control signal.

5. The infrared transmitting circuit according to claim 1, characterized in that: The infrared transmitting circuit also includes a controller; The input end of the controller is connected to the synchronization signal bus for receiving the synchronization signal; the controller determines the switch light control signal of the infrared emitting element based on the synchronization signal; The first signal end of the switch module is connected to the first output end of the controller and is used to receive the switch light control signal sent by the controller.

6. The infrared transmitting circuit according to claim 1, characterized in that: The infrared transmitting circuit also includes a controller; The input end of the controller is connected to the synchronization signal bus for receiving the synchronization signal; the controller determines the working state of each infrared emitting element on the infrared touch panel based on the synchronization signal; Determine the switch on / off control signal based on the working status of each infrared emitting element on the infrared touch panel; The controlled end of the switch module is connected to the second output end of the controller and is used to receive the switch on / off control signal sent by the controller.

7. The infrared transmitting circuit according to claim 1, characterized in that: The switch module includes 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 connection end of the first switch element is the first signal end of the switch module; the fourth connection end of the first switch element is connected to the controlled end of the second switch element; the fifth connection end of the second switch element is the second signal end of the switch module; and the sixth connection end of the second switch element is the third signal end of the switch module.

8. The infrared transmitting circuit according to claim 7, characterized in that: The fourth connection terminal of the first switch element is further connected to a reference power source via a third resistor.

9. The infrared transmitting circuit according to claim 1, characterized in that: The switch module includes 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 connection end of the first switch element is the third signal end of the switch module; the fourth connection end of the first switch element is connected to the fifth connection end of the second switch element; The controlled end of the second switch element is the first signal end of the switch module; the fifth connection end of the second switch element is the second signal end of the switch module; and the sixth connection end of the second switch element is grounded.

10. The infrared transmitting circuit according to any one of claims 7 to 9, characterized in that: The first switch element includes a second field effect tube; the gate of the second field effect tube is the controlled end of the first switch element; the drain or source of the second field effect tube is the third connection end of the first switch element; the source or drain of the second field effect tube is the fourth connection end of the first switch element; or, The first switching element includes a second triode, a fourth resistor and a first acceleration capacitor; the base of the second triode is connected via the fourth resistor and serves as the controlled end of the first switching element; the first acceleration capacitor is connected in parallel to both ends of the fourth resistor; the collector or emitter of the second triode is the third connection end of the first switching element; and the emitter or collector of the second triode is the fourth connection end of the first switching element.

11. The infrared transmitting circuit according to any one of claims 7 to 9, characterized in that: The second switch element includes a third field effect tube; the gate of the third field effect tube is the controlled end of the second switch element; the drain or source of the third field effect tube is the fifth connection end of the second switch element; The source or drain of the third field effect transistor is the sixth connection terminal of the second switch element; or, The second switching element includes a third triode, a fifth resistor and a second acceleration capacitor; the base of the third triode serves as the controlled end of the second switching element after passing through the fifth resistor; the second acceleration capacitor is connected in parallel to both ends of the fifth resistor; the collector or emitter of the third triode is the fifth connection end of the second switching element; and the emitter or collector of the third triode is the sixth connection end of the second switching element.

12. An interactive tablet, characterized in that: The invention comprises the infrared transmitting circuit as described in any one of claims 1 to 11.

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