Infrared touch frame and interactive flat panel

Abstract

Provided in the embodiments of the present application are an infrared touch frame and an interactive flat panel. The infrared touch frame comprises at least two infrared touch panels connected to each other; each infrared touch panel is provided with an infrared emitting circuit and an infrared receiving circuit; the infrared emitting circuit comprises a voltage buffer module, a switch module, a gain amplification module and several infrared emitters; the several infrared emitters are connected to each other to form an infrared emitting matrix; an input end of the voltage buffer module is used for receiving an infrared emission gain control signal, and an output end of the voltage buffer module is connected to an input end of the gain amplification module; a controlled end of the switch module is used for receiving a switch on-off control signal; a first signal end of the switch module is used for receiving a lamp on-off control signal for the infrared emitters; a second signal end of the switch module is connected to an input end of the gain amplification module; and an output end of the gain amplification module is connected to a power signal bus by means of the infrared emitting matrix. The present application can reduce the interference to infrared receiving signals.

Description

Infrared touch frame and interactive flat panel

[0001] This application claims priority to Chinese Patent Application No. 202410931825.9, filed on July 12, 2024, entitled "Infrared Touch Frame and Interactive Flat Panel", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of infrared signal processing, for example to an infrared touch frame and an interactive flat panel. Background Technology

[0003] The infrared touch frame uses multiple infrared transmitters and receivers set on the four edges of the frame to control the infrared transmitters to emit infrared signals. The infrared receivers acquire these signals and obtain corresponding infrared received signals. After a series of stabilization adjustments and A / D (analog to digital converter) sampling processes, the infrared received signals are analyzed to determine whether there is an object blocking the infrared light, thereby determining the touch operation status.

[0004] Because infrared received signals are weak analog signals, and other strong signals also exist on the infrared touchpad, the weak infrared received signals are easily interfered with by other strong signals and high-power signals.

[0005] Summary of the Invention

[0006] To overcome the problems existing in related technologies, this application provides an infrared touch frame and an interactive flat panel, which can reduce interference with infrared receiving signals.

[0007] According to a first aspect of the embodiments of this application, an infrared touch frame is provided, including at least two infrared touch panels connected to each other; each infrared touch panel is provided with an infrared emitting circuit and an infrared receiving circuit, the infrared emitting circuit including a voltage buffer module, a switching module, a gain amplification module and a plurality of infrared emitting elements; the plurality of infrared emitting elements are connected to each other to form an infrared emitting matrix;

[0008] The input terminal of the voltage buffer module is connected to the analog signal bus to receive the infrared emission gain control signal; the output terminal of the voltage buffer module is connected to the input terminal of the gain amplification module.

[0009] The controlled terminal of the switch module is used to receive the switch on / off control signal; the first signal terminal of the switch module is used to receive the switch control signal of the infrared emitter; the second signal terminal of the switch module is connected to the input terminal of the gain amplifier module; the third signal terminal of the switch module is grounded; wherein, the switch on / off control signal is determined based on the working state of the infrared emitter on the infrared touch panel;

[0010] The output terminal of the gain amplifier module is connected to the power signal bus via the infrared emission matrix; the common terminal of the gain amplifier module is grounded.

[0011] According to a second aspect of the embodiments of this application, an interactive flat panel is provided, including the infrared touch frame described above.

[0012] The infrared touch frame of this application comprises at least two interconnected infrared touch panels. Each infrared touch panel is equipped with an infrared emitting circuit and an infrared receiving circuit. The infrared emitting circuit includes a voltage buffer module, a switching module, a gain amplification module, and several infrared emitters. When any infrared emitter on the touch panel is in the emitting state, the gain amplification module on that touch panel is controlled by an infrared emitting gain control signal and a light-on / off control signal, thereby ensuring the normal operation of the infrared emitters on the touch frame. When all infrared emitters on the touch panel are not in the emitting state, the gain amplification module on that touch panel is cut off, thus depriving the current signal of the infrared emitting matrix of control over the infrared emitting gain control signal and the light-on / off control signal. In other words, the infrared emitting circuit on the infrared touch panel remains unchanged, thereby reducing interference with the infrared receiving signal, for example, reducing interference with the infrared receiving signal on the same touch panel.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application.

[0014] To better understand and implement this application, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a schematic diagram of the arrangement of infrared transmitters and receivers in related technologies;

[0017] Figure 2 is a schematic diagram of the arrangement of infrared transmitters and receivers in another related technology;

[0018] Figure 3 is a schematic diagram of the arrangement principle of the infrared touch panel in the related technology;

[0019] Figure 4 is a schematic diagram of the structure of the infrared emitting circuit in the related technology;

[0020] Figure 5 is a schematic diagram of an infrared emitting circuit according to an embodiment of this application;

[0021] Figure 6 is a schematic diagram of a switching module according to an embodiment of this application;

[0022] Figure 7 is a schematic diagram of a switching module according to another embodiment of this application;

[0023] Figure 8 is a schematic diagram of the structure of an infrared emitting circuit according to an embodiment of this application;

[0024] Figure 9 is a schematic diagram of the structure of an infrared emitting circuit according to another embodiment of this application;

[0025] Figure 10 is a schematic diagram of the structure of an infrared emitting circuit according to another embodiment of this application;

[0026] Figure 11 is a schematic block diagram of the structure of an interactive flat panel according to an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Wherein, when the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0028] It should be understood that the embodiments described below do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0029] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms "a" and "the" as used herein are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items, for example, A and / or B, which can represent: A alone, A and B together, and B alone; the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, this information should not be limited to these terms, and these terms are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Depending on the context, the word "if" as used in this application can be interpreted as "when," "when," or "in response to determination."

[0031] The infrared touch frame sets up multiple infrared transmitters and multiple infrared receivers on the four edges of the frame, thereby controlling the infrared transmitters to emit infrared signals. The infrared receivers acquire the infrared signals and obtain the corresponding infrared received signals. After a series of stabilization adjustments and A / D (analog to digital converter) sampling processes, the changes in the processed received signals are used to determine whether an object is blocking the infrared light, thereby determining the touch operation status.

[0032] Among the related technologies, there are two main ways to set infrared transmitters and receivers on the four edges of the infrared touch frame: as shown in Figure 1, one is that the infrared transmitters and receivers are set on opposite sides of the touch frame respectively; as shown in Figure 2, the other is that the infrared transmitters and receivers are arranged alternately on the same side of the touch frame. In Figures 1 and 2, the white circle represents the infrared transmitter and the black circle represents the infrared receiver.

[0033] In one embodiment, referring to Figure 3, several infrared touch panels 100 are arranged on the four edges of the infrared touch frame. According to different functions and positions, the several infrared touch panels 100 are divided into a main board and multiple slave boards. The main board and slave boards are connected by an analog signal bus, a digital signal bus, a synchronization signal bus and a power signal bus.

[0034] The main board and slave board share a power signal bus to provide power signals, i.e., power to the infrared transmitters and receivers connected to each other.

[0035] Before scanning begins, the main board sends scanning data to each slave board via a digital signal bus, controlling the infrared transmitters. Each slave board shares the digital signal bus, acquires its own scanning data, and controls its respective infrared transmitter to perform the scanning operation based on that data. The scanning data includes the position information of the infrared receivers and transmitters connected to that slave board, as well as the corresponding scanning logic.

[0036] After scanning begins, the main board transmits synchronization signals to each slave board via a synchronization signal bus to control the corresponding slave board to perform scanning. In one embodiment, after receiving the synchronization signal sent by the main board, the slave board triggers the start of scanning based on the synchronization signal. The slave board reads the scan data it has stored and controls the working state of the connected infrared receiver and infrared transmitter according to the synchronization signal. The synchronization signal bus can be an analog signal bus or a digital signal bus.

[0037] Meanwhile, the main board transmits infrared emission gain control signals to each slave board via an analog signal bus to control the emission power of the infrared emitters on the corresponding slave boards.

[0038] Each slave board shares an analog signal bus, which loads the analog electrical signal corresponding to the infrared signal received by the infrared receiver (hereinafter referred to as "infrared received signal") onto the analog signal bus and transmits it to the host board; the host board detects the infrared received signal from the analog signal bus and converts the infrared received signal into a digital signal; the digital signal is used to calculate the coordinate position of the touched object.

[0039] It should be understood that the analog signal bus and digital signal bus mentioned above are a group of transmission lines consisting 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 distributed to different channels or wires for transmission. For example, if the type of the synchronization signal bus is an analog signal bus, when the analog signal bus transmits the synchronization signal, infrared transmission gain control signal, and infrared reception signal at the same time, the analog signal bus will distribute the synchronization signal, infrared transmission gain control signal, and infrared reception signal to different channels or wires for transmission.

[0040] The following section explains the principle of signal interference in the case where infrared transmitters and receivers are arranged alternately on the same side of the touch frame, in conjunction with the structure of the infrared touchpad.

[0041] Please refer to Figures 3 and 4 simultaneously. Each infrared touch panel 100 (main board and slave board) is equipped with an infrared emitting circuit 101 and an infrared receiving circuit 102. The infrared emitting circuit 101 includes a voltage buffer QT3, a switch QT2, a gain amplifier QT1, and several infrared emitters (not shown in the figure); the several infrared emitters are interconnected to form an infrared emitting matrix; the infrared receiving circuit includes several infrared receivers (not shown in the figure).

[0042] The input terminal of voltage buffer QT3 is connected to the analog signal bus to receive infrared emission gain control signals; the common terminal of voltage buffer QT3 is connected to the reference power supply VCC via resistor RG9, and the output terminal of voltage buffer QT3 is connected to the input terminal of gain amplifier QT1 via resistor RG10.

[0043] The controlled terminal of switch QT2 is connected to the synchronization signal bus to receive synchronization signals; the first signal terminal of switch QT2 is grounded; the second signal terminal of switch QT2 is connected to the input terminal of gain amplifier QT1. The output terminal of gain amplifier QT1 is connected to the power signal bus PWR via an infrared emission matrix; the common terminal of gain amplifier QT1 is grounded. The synchronization signal includes a light-on / off control signal, used to control whether each infrared emitter on the infrared touch panel 100 is operational.

[0044] Although only one infrared emitter on an infrared touchpad is active at any given time, since there are multiple infrared emitters on the touchpad, if any one of the infrared emitters is active, the touchpad is considered to be in an active state; if all the infrared emitters are inactive, the touchpad is considered to be in a non-active state.

[0045] Therefore, for an infrared touchpad in the transmitting state, the gain amplification module on the touchpad amplifies the infrared transmission gain control signal according to the infrared transmission gain control signal and the synchronization signal, which then drives the infrared transmitter in the infrared transmission matrix of the touchpad to work, thereby causing a sharp change in the power signal on the infrared transmission matrix. For an infrared touchpad in the non-transmitting state, its infrared transmission circuit 101, including voltage buffer QT3, switch QT2, and gain amplification component QT1, also amplifies the infrared transmission gain control signal under the control of the infrared transmission gain control signal and the synchronization signal. Moreover, the excessively long coupling path between the infrared transmission circuit 101 and the analog signal bus in the infrared touchpad causes the infrared receiver received by the infrared receiver on the non-transmitting infrared touchpad to be affected by crosstalk from the infrared transmission circuit 101. Furthermore, the crosstalk from the infrared transmission circuits 101 of multiple infrared touchpads also has a superposition effect on the infrared receiver signal.

[0046] It is understood that crosstalk refers to noise on two signal lines caused by coupling, mutual inductance, or mutual capacitance. In one embodiment, when two signal lines transmit different signals, even if they are not in contact, the interaction of electric fields (capacitive coupling) and magnetic fields (inductive coupling) induces a small signal in adjacent signal lines, thereby interfering with the signals detected by adjacent signal lines.

[0047] In this embodiment, when any infrared emitter on the infrared touchpad is in the emitting state, the gain amplification module of the infrared touchpad is controlled by the on / off control signal and the infrared emission gain control signal. This causes the infrared emitting circuit on the infrared touchpad to change according to the changes in the infrared emission gain control signal and the on / off control signal, thereby ensuring the normal operation of the infrared emitter. When all infrared emitters on the infrared touchpad are not in the emitting state, the gain amplification module on the infrared touchpad is turned off, thus making the gain amplification module of the infrared touchpad uncontrolled by the on / off control signal and the infrared emission gain control signal. This prevents the current signal of the infrared emission matrix from changing according to the changes in the infrared emission gain control signal and the on / off control signal. In other words, the infrared emitting circuit on the infrared touchpad remains unchanged, thereby reducing interference to the infrared receiving signal, for example, reducing interference to the infrared receiving signal on the same infrared touchpad.

[0048] The infrared touch frame provided in the embodiments of this application will be described in detail below with reference to Figures 5 to 10.

[0049] Please refer to Figure 5. The infrared touch frame provided in this embodiment includes at least two infrared touch panels that are interconnected. Each infrared touch panel is provided with an infrared emitting circuit and an infrared receiving circuit. The infrared emitting circuit includes a voltage buffer module 11, a switch module 12, a gain amplification module 13, and several infrared emitters. The several infrared emitters are interconnected to form an infrared emitting matrix 14.

[0050] The input terminal of the voltage buffer module 11 is connected to the analog signal bus to receive the infrared emission gain control signal V_TAGC; the common terminal of the voltage buffer module 11 is connected to the reference power supply VCC; and the output terminal of the voltage buffer module 11 is connected to the input terminal of the gain amplification module 13.

[0051] The controlled terminal of the switch module 12 is used to receive the switch on / off control signal K; the first signal terminal of the switch module 12 is used to receive the switch control signal TEN from the infrared emitter; the second signal terminal of the switch module 12 is connected to the input terminal of the gain amplifier module 13; and the third signal terminal of the switch module 12 is grounded.

[0052] The output of the gain amplifier module 13 is connected to the power signal bus via the infrared emission matrix 14; the common terminal of the gain amplifier module 13 is grounded.

[0053] Among them, the switch on / off control signal K is a control signal emitted 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 emitter on the infrared touch panel.

[0054] In one embodiment, when any infrared emitter on the infrared touchpad is in the emitting state, the infrared touchpad controls the switch module 12 via the switch on / off control signal K, causing the second signal terminal of the switch module 12 to conduct with the first signal terminal, so that the gain amplifier module 13 can be controlled by the light switch control signal TEN and the infrared emission gain control signal V_TAGC. When all infrared emitters on the infrared touchpad are not in the emitting state, the infrared touchpad controls the switch module 12 via the switch on / off control signal K, causing the second signal terminal of the switch module 12 to conduct with the third signal terminal, thereby grounding the input terminal of the gain amplifier module 13, thus turning off the gain amplifier module 13, so that the gain amplifier module 13 is not controlled by the light switch control signal TEN and the infrared emission gain control signal V_TAGC.

[0055] It should be understood that since the switch on / off control signal K is a control signal emitted by the infrared touch panel itself, the trace is extremely short, and its impact on the received signal of the infrared receiver is negligible.

[0056] The working principle of the embodiments of this application is explained below:

[0057] When any infrared emitter on the infrared touchpad is in the emitting state, the touchpad controls the switch module 12 via the on / off control signal K, making the second signal terminal of the switch module 12 connected to the first signal terminal. This allows the gain amplifier module 13 to be controlled by the on / off control signal TEN and its current signal to be adjusted by the infrared emission gain control signal V_TAGC. This causes the power signal PWR of the infrared emission matrix 14 to change according to the changes in the infrared emission gain control signal V_TAGC and the on / off control signal TEN, ensuring the infrared emitters function normally. Generally, only one infrared touchpad is active at any given time. Therefore, only the power signal of the infrared emission matrix 14 on one touchpad changes. The interference path between this power signal and the infrared receiving signal on the same touchpad is relatively short, resulting in minimal interference to the infrared receiving signal.

[0058] When all infrared emitters on the infrared touchpad are not in the emitting state, the infrared touchpad controls the switch module 12 through the switch on / off control signal K, making the second signal terminal of the switch module 12 conduct, thereby grounding the input terminal of the gain amplifier module 13, thus turning off the gain amplifier module 13. At this time, the gain amplifier module 13 is not controlled by the switch light control signal TEN and the infrared emission gain control signal V_TAGC. In other words, the gain amplifier module 13 does not change due to the changes in the switch light control signal TEN and the infrared emission gain control signal V_TAGC, thus keeping the power signal of the infrared emission matrix 14 unchanged. The power signal on the infrared emission matrix will not change, reducing interference to the infrared receiving signal on the infrared touchpad, for example, reducing interference to the infrared receiving signal on the same infrared touchpad.

[0059] The infrared touch frame of this application embodiment uses at least two interconnected infrared touch panels. Each infrared touch panel is equipped with an infrared emitting circuit and an infrared receiving circuit. The infrared emitting circuit includes a voltage buffer module 11, a switch module 12, a gain amplification module 13, and several infrared emitters. When any infrared emitter on the infrared touch panel is in the emitting state, the gain amplification module 13 on that touch panel is controlled by the infrared emitting gain control signal V_TAGC and the light switch control signal TEN, thereby ensuring the normal operation of the infrared emitters on the infrared touch frame. When all infrared emitters on the infrared touch panel are not in the emitting state, the gain amplification module 13 is turned off, thus the current signal of the infrared emitting matrix is ​​no longer controlled by the infrared emitting gain control signal V_TAGC and the light switch control signal TEN, keeping the infrared emitting circuit on the infrared touch panel unchanged. This prevents the power signal on the infrared emitting matrix from changing drastically, reducing interference with the infrared received signal on the infrared touch panel, and further reducing interference with the infrared received signal on the same infrared touch panel.

[0060] In an optional embodiment, the light switch control signal TEN is directly determined by a synchronization signal. In one embodiment, the first signal terminal of the switch module 12 is connected to a synchronization signal bus to receive a synchronization signal; the synchronization signal includes the light switch control signal TEN.

[0061] It should be understood that the synchronization signal is used to control the working status of each infrared emitter on each infrared touchpad.

[0062] To prevent the synchronization signal from interfering with other signals when transmitted through the synchronization signal bus, one infrared touchpad (main board) first attenuates the synchronization signal through a signal attenuation circuit before transmitting the attenuated synchronization signal to the other infrared touchpads (slave boards) via the synchronization signal bus. The other infrared touchpads (slave boards) receive the attenuated synchronization signal and then amplify and restore it through a signal conditioning circuit to obtain the restored synchronization signal.

[0063] In this embodiment, the synchronization signal includes the light switch control signal TEN. At this time, the synchronization signal has been attenuated on the host board before transmission, so the change of the synchronization signal during transmission has little impact on the infrared received signal and can be ignored. Moreover, the signal is amplified and restored on the slave board, which does not affect the driving force of the signal itself. Therefore, by using the synchronization signal as the light switch control signal TEN, the impact on the infrared received signal can be reduced.

[0064] In another alternative embodiment, the light-on / off control signal TEN is determined by the controller of the infrared touchpad based on a synchronization signal. In one embodiment, the infrared touchpad further includes a controller; the input terminal of the controller is connected to a synchronization signal bus for receiving the synchronization signal; the controller determines the light-on / off control signal TEN of the infrared transmitter based on the synchronization signal; the first signal terminal of the switch module 12 is connected to the first output terminal of the controller for receiving the light-on / off control signal TEN sent by the controller.

[0065] Understandably, other infrared touchpads (slave boards) receive the attenuated synchronization signal, amplify and restore it, and then distribute the restored synchronization signal to their own controllers. The controllers, based on the synchronization signal, send infrared transmitter row and column control signals to the infrared transmitter matrix, which in turn control the operation of each infrared transmitter in the matrix. Furthermore, the controllers determine the on / off control signal TEN for the infrared transmitters on the touchpads based on the synchronization signal, further shortening the coupling path between the synchronization signal bus and the infrared transmitting circuit 101 within the touchpad, thereby further reducing interference with the received infrared signal.

[0066] In an optional embodiment, the switch on / off control signal K is determined by the infrared touch panel based on a synchronization signal. In one embodiment, the infrared touch panel further includes a controller; the input terminal of the controller is connected to a synchronization signal bus for receiving the synchronization signal; the controller determines the operating state of the infrared emitter on the infrared touch panel based on the synchronization signal, and determines the switch on / off control signal K based on the operating state of the infrared emitter on the infrared touch panel; the controlled terminal of the switch module 12 is connected to the second output terminal of the controller for receiving the switch on / off control signal K sent by the controller.

[0067] It is understandable that other infrared touchpads (slave boards) receive the attenuated synchronization signal, amplify and restore it, and then distribute the restored synchronization signal to their own controllers. The controllers, based on the synchronization signal, send infrared emitter row and column control signals to the infrared emission matrix, which in turn control the operation of each infrared emitter in the infrared emission matrix. Furthermore, the controllers determine the switch on / off control signal K based on the synchronization signal, controlling the on / off state of the switch module 12. In other words, the switch on / off control signal K in this embodiment is the control signal of the infrared touchpad itself, with extremely short traces, and its interference with the received signal is negligible.

[0068] In this embodiment, the controller on the infrared touchpad determines the working state of the infrared transmitter on the infrared touchpad based on the synchronization signal, and then determines the switch on / off control signal K based on the working state of the infrared transmitter on the infrared touchpad to control the switch module 12. This can reduce control complexity, shorten control wiring, and reduce interference to the infrared receiving signal.

[0069] In an optional embodiment, the controller determines that the infrared touchpad is in the emission state when any infrared emitter on the infrared touchpad is in the emission state based on the synchronization signal. Then, the controller 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 connected to the first signal terminal of the switch module 12. This allows the gain amplification module 13 to be controlled by the switch light control signal TEN, and the gain amplification module 13 to be controlled by the infrared emission gain control signal V_TAGC to adjust the current signal magnitude, ensuring that the infrared emitters on the infrared touchpad work normally. If the controller determines, based on the synchronization signal, that all infrared emitters on the infrared touchpad are not in the emission state, then the infrared touchpad is determined to be in a non-emission state. The controller then controls the switch module 12 via the switch on / off control signal K, making the second signal terminal of the switch module 12 connected to the third signal terminal of the switch module 12, grounding the gain amplifier module 13, and thus cutting off the gain amplifier module 13. This makes the gain amplifier module 13 uncontrolled by the switch light control signal TEN and the infrared emission gain control signal V_TAGC, keeping the infrared emission circuit on the infrared touchpad unchanged. This also prevents the power signal on the infrared emission matrix from changing, thereby reducing interference to the infrared receiving signal on the same infrared touchpad.

[0070] In an optional embodiment, when the switching module of one infrared touchpad is turned on, the switching modules of the other infrared touchpads are turned off. That is, only the switching module of one infrared touchpad is active at any given time. This prevents amplification of the infrared emission gain control signal under the control of the infrared emission gain control signal and the infrared lamp control signal when all infrared emitters on the other infrared touchpads are inactive. Simultaneously, it also prevents excessively long routing paths of the infrared emitting circuits within the infrared touchpad and the coupling paths of the analog signal bus, which could lead to crosstalk from multiple infrared touchpads affecting the superposition of the infrared received signal.

[0071] Referring 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.

[0072] The input terminal of voltage buffer element QT3 is the input terminal of voltage buffer module 11 and is connected to the analog signal bus to receive the infrared emission gain control signal V_TAGC. The first connection terminal of voltage buffer element QT3 is connected to the first terminal of the first resistor RG9. The second terminal of the first resistor RG9 is the common terminal of voltage buffer module 11 and is connected to the reference power supply VCC. The second connection terminal of voltage buffer element QT3 is the output terminal of voltage buffer module 11 and is connected to the input terminal of gain amplification module 13. The second connection terminal of voltage buffer element QT3 is also grounded through the second resistor RG8.

[0073] The infrared emission gain control signal V_TAGC is amplified by voltage buffer element QT3, first resistor RG9 and second resistor RG8 to increase the driving capability of the infrared emission gain control signal V_TAGC to the gain amplification module. This allows the gain amplification module to respond promptly according to the infrared emission gain control signal V_TAGC, thereby improving the accuracy of infrared signal detection.

[0074] It should be understood that the voltage buffer module 11 can also be an integrated voltage buffer chip or other device structures that can implement the solution of this application, and this application does not limit it.

[0075] In this circuit, voltage buffer element QT3 is a first field-effect transistor; the gate of the first field-effect transistor is the input terminal of voltage buffer element QT3; the drain or source of the first field-effect transistor is the first connection terminal of voltage buffer element QT3; and the source or drain of the first field-effect transistor is the second connection terminal of voltage buffer element QT3.

[0076] Alternatively, the voltage buffer element QT3 is the first transistor; the base of the first transistor is the input terminal of the voltage buffer element QT3; the collector or emitter of the first transistor is the first connection terminal of the voltage buffer element QT3; and the emitter or collector of the first transistor is the second connection terminal of the voltage buffer element QT3.

[0077] It is understood that the voltage buffer element QT3 can also be other device structures that can realize the solution of this application, such as voltage buffer elements, and this application does not limit them.

[0078] Referring to Figure 6, in an optional embodiment, the switch module 12 includes a first switch element 121 and a second switch element 122.

[0079] The controlled terminal of the first switching element 121 is the controlled terminal of the switching module 12, used to receive the on / off control signal K from the infrared touch panel; the third connection terminal of the first switching element 121 is the first signal terminal of the switching module 12, used to receive the on / off 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 the second signal terminal of the switching module 12, connected to the input terminal of the gain amplifier module 13; the sixth connection terminal of the second switching element 122 is the third signal terminal of the switching module 12, and the sixth connection terminal of the second switching element 122 is grounded.

[0080] When any infrared emitter on the infrared touchpad is in the emission state, the first switching element 121 receives the switch on / off control signal K to indicate that the switch is closed, and then conducts the first switching element 121. 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 light switch control signal TEN, and thus the gain amplification module 13 can be controlled by the light switch control signal TEN to control its on / off state, and controlled by the infrared emission gain control signal V_TAGC to adjust the current signal magnitude.

[0081] When all infrared emitters on the infrared touchpad are not in the emitting state, the first switching element 121 receives the switch on / off control signal K indicating that the switch is off, and then disconnects the first switching element 121, causing the second switching element 122 to conduct. This grounds the input terminal of the gain amplifier module 13, putting the gain amplifier module 13 in the off state. In this way, no matter how the infrared emission gain control signal V_TAGC and the light switch control signal TEN change, they will not affect the gain amplifier module 12. Consequently, 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 light switch control signal TEN, thereby reducing interference to the infrared receiving signals on the same board.

[0082] In an optional embodiment, referring to FIG6, 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.

[0083] Referring to Figure 7, in another optional embodiment, the switch module 12 includes a first switch element 121 and a second switch element 122.

[0084] The controlled terminal of the first switching element 121 is the controlled terminal of the switching module 12, used to receive the 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 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.

[0085] The controlled terminal of the second switching element 122 is the first signal terminal of the switching module 12, used to receive the lamp switching control signal TEN; the fifth connection terminal of the second switching element 122 is the second signal terminal of the switching module 12, connected to the input terminal of the gain amplifier module 13; the sixth connection terminal of the second switching element 122 is grounded.

[0086] When any infrared emitter on the infrared touchpad is in the emission state, the first switching element 121 receives the switch on / off control signal K to indicate that the switch is off, and then disconnects the first switching element 121, so that the gain amplification module 13 can be controlled by the switch light control signal TEN to control its on / off state, and the current signal magnitude can be adjusted by the infrared emission gain control signal V_TAGC.

[0087] When all infrared emitters on the infrared touchpad are not in the emitting state, the first switching element 121 is turned on after the switch on / off control signal K indicates that the switch is closed. This causes 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 amplifier module 13 is connected to the fifth connection terminal of the second switching element 122, the input terminal of the gain amplifier module 13 will also be grounded, thus putting the gain amplifier module 13 in the off state. In this way, no matter how the infrared emission gain control signal V_TAGC and the switch light control signal TEN change, it will not affect the gain amplifier module 12. Consequently, 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 light control signal TEN, thereby reducing interference to the infrared receiving signals on the same board.

[0088] In an optional embodiment, referring to Figures 8 or 9, the first switching element 121 includes a second field-effect transistor (FET) QT4; the gate of the second FET QT4 is the controlled terminal of the first switching element 121; the drain or source of the second FET QT4 is the third connection terminal of the first switching element 121; and the source or drain of the second FET QT4 is the fourth connection terminal of the first switching element 121. This application improves the response efficiency of the first switching element 121 to the switch on / off control signal K by using the second FET QT4 as the first switching element 121.

[0089] In another optional embodiment, referring to FIG10, the first switching element 121 includes a second transistor QT5, a fourth resistor RG13, and a first accelerating capacitor CZ2; the base of the second transistor QT5 is connected via the fourth resistor RG13 and serves as the controlled terminal of the first switching element 121; the first accelerating capacitor CZ2 is connected in parallel across the fourth resistor RG13; the collector or emitter of the second transistor QT5 is the third connection terminal of the first switching element 121; the emitter or collector of the second transistor QT5 is the fourth connection terminal of the first switching element 121. This embodiment of the application reduces the circuit cost of the first switching element 121 for controlling the switch on / off signal K by using the second transistor QT5 as the first switching element 121.

[0090] It should be understood that the first switching element 121 can also be other switches or other device structures that can realize the solution of this application, and this application does not limit them.

[0091] In an optional embodiment, referring to Figure 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; and the source or drain of the third field-effect transistor QT2 is the sixth connection terminal of the second switching element 122. This application improves the response efficiency of the second switching element 122 to the switch on / off control signal K and the lamp switch control signal by using the third field-effect transistor QT2 as the second switching element 122.

[0092] In another optional embodiment, referring to FIG10, 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 serves as the controlled terminal of the second switching element 122 via the fifth resistor RG12; the second accelerating capacitor CZ1 is connected in parallel across the fifth resistor RG12; the collector or emitter of the third transistor QT6 is the fifth connection terminal of the second switching element 122; and the emitter or collector of the third transistor QT6 is the sixth connection terminal of the second switching element 122. This embodiment of the application reduces the circuit cost of the second switching element 122 for controlling the switch on / off signal K by using the third transistor QT6 as the second switching element 122.

[0093] It should be understood that the second switching element 122 can also be other switches or other device structures that can realize the solution of this application, and this application does not limit them.

[0094] Please refer to Figures 8 to 10. In an optional embodiment, the gain amplification module 13 includes a gain amplification element and a sixth resistor RG10.

[0095] The input terminal of the gain amplifier is the input terminal of the gain amplifier module 13. The input terminal of the gain amplifier is connected to the output terminal of the voltage buffer module 11 via the sixth resistor RG10. The common terminal of the gain amplifier is the common terminal of the gain amplifier module. The output terminal of the gain amplifier is the output terminal of the gain amplifier.

[0096] The amplifying element includes a fourth transistor QT1; the base of the fourth transistor QT1 is the input terminal of the gain amplification device; the collector or emitter of the fourth transistor QT1 is the output terminal of the gain amplification device; the emitter or collector of the fourth transistor QT1 is the common terminal of the gain amplification device.

[0097] Alternatively, the gain amplifier includes a fourth field-effect transistor; the gate of the fourth field-effect transistor is the input terminal of the gain amplifier; the drain or source of the fourth field-effect transistor is the output terminal of the gain amplifier; and the source or drain of the fourth field-effect transistor is the common terminal of the gain amplifier.

[0098] It should be understood that the gain amplification device can also be other amplification structures, such as amplification chips, etc., and this application does not limit it.

[0099] Please refer to Figure 11. This application embodiment also provides an interactive flat panel 40, including an infrared touch frame 41. The infrared emitting circuit of this application embodiment has the same structure as the aforementioned one, and will not be described in detail here.

[0100] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0101] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An infrared touch frame, comprising at least two infrared touch panels interconnected; wherein: Each of the infrared touch panels is provided with an infrared emitting circuit and an infrared receiving circuit. The infrared emitting circuit includes a voltage buffer module, a switching module, a gain amplification module, and several infrared emitting elements; the several infrared emitting elements are interconnected to form an infrared emitting matrix. The input terminal of the voltage buffer module is connected to the analog signal bus to receive the infrared emission gain control signal; the output terminal of the voltage buffer module is connected to the input terminal of the gain amplification module. The controlled terminal of the switch module is used to receive the switch on / off control signal; the first signal terminal of the switch module is used to receive the switch control signal of the infrared emitter; the second signal terminal of the switch module is connected to the input terminal of the gain amplifier module; the third signal terminal of the switch module is grounded; wherein, the switch on / off control signal is determined based on the working state of the infrared emitter on the infrared touch panel; The output terminal of the gain amplifier module is connected to the power signal bus via the infrared emission matrix; the common terminal of the gain amplifier module is grounded.

2. The infrared touch frame according to claim 1, wherein: The first signal terminal of the switch module is connected to the synchronization signal bus and is used to receive synchronization signals; the synchronization signals include light switching control signals.

3. The infrared touch frame according to claim 1, wherein: The infrared touch panel also includes a controller; The input terminal of the controller is connected to the synchronization signal bus to receive the synchronization signal; the controller determines the switching control signal of the infrared transmitter based on the synchronization signal. The first signal terminal of the switch module is connected to the first output terminal of the controller, and is used to receive the switch control signal sent by the controller.

4. The infrared touch frame according to claim 1, wherein: The infrared touch panel also includes a controller; The controller's input terminal is connected to a synchronization signal bus to receive synchronization signals; the controller determines the operating status of each infrared emitter on the infrared touchpad based on the synchronization signals. The on / off control signal of the switch is determined based on the working status of each infrared emitter on the infrared touch panel; The controlled terminal of the switch module is connected to the second output terminal of the controller and is used to receive the switch on / off control signal sent by the controller.

5. The infrared touch frame according to claim 4, wherein: The controller determines the operating state of any infrared emitter on the infrared touchpad based on the synchronization signal. In the transmitting state, the second signal terminal of the switch module is connected to the first signal terminal of the switch module by the switch on / off control signal, so that the gain amplification module is controlled to be on and off by the switch lamp control signal and the magnitude of the current signal is adjusted by the infrared emission gain control signal. When the controller determines, based on the synchronization signal, that all infrared emitters on the infrared touchpad are not in the emission state, it controls the second signal terminal of the switch module to be connected to the third signal terminal of the switch module through the switch on / off control signal, thereby turning off the gain amplification module and making the gain amplification module uncontrollable by the switch light control signal and the infrared emission gain control signal.

6. The infrared touch frame according to claim 1, wherein: When the switching module of one infrared touchpad is turned on, the switching modules of the other infrared touchpads are turned off.

7. The infrared touch frame according to claim 1, wherein: The switching module includes a first switching element and a second switching element; The controlled terminal of the first switching element is the controlled terminal of the switching module; the third connection terminal of the first switching element is the first signal terminal of the switching module; the fourth connection terminal of the first switching element is connected to the controlled terminal of the second switching element; the fifth connection terminal of the second switching element is the second signal terminal of the switching module; and the sixth connection terminal of the second switching element is the third signal terminal of the switching module.

8. The infrared touch frame according to claim 7, wherein: The fourth connection terminal of the first switching element is also connected to the reference power supply via a third resistor.

9. The infrared touch frame according to claim 1, wherein: The switching module includes a first switching element and a second switching element; The controlled terminal of the first switching element is the controlled terminal of the switching module; the third connection terminal of the first switching element is the third signal terminal of the switching module; the fourth connection terminal of the first switching element is connected to the fifth connection terminal of the second switching element. The controlled terminal of the second switching element is the first signal terminal of the switching module; the fifth connection terminal of the second switching element is the second signal terminal of the switching module; and 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 includes a second field-effect transistor; the gate of the second field-effect transistor is the controlled terminal of the first switching element; the drain or source of the second field-effect transistor is the third connection terminal of the first switching element; the source or drain of the second field-effect transistor is the fourth connection terminal of the first switching element. or, The first switching element includes a second transistor, a fourth resistor, and a first accelerating capacitor; the base of the second transistor is connected via the fourth resistor and serves as the controlled terminal of the first switching element; the first accelerating capacitor is connected in parallel to the first... The four resistors are connected at both ends; the collector or emitter of the second transistor is the third connection terminal of the first switching element; the emitter or collector of the second transistor is the fourth connection terminal of the first switching element.

11. The infrared touch frame according to claim 8 or 9, wherein: The second switching element includes a third field-effect transistor; the gate of the third field-effect transistor is the controlled terminal of the second switching element; the drain or source of the third field-effect transistor is the fifth connection terminal of the second switching element. The source or drain of the third field-effect transistor is the sixth connection terminal of the second switching element; or, The second switching element includes a third transistor, a fifth resistor, and a second accelerating capacitor; the base of the third transistor serves as the controlled terminal of the second switching element via the fifth resistor; the second accelerating capacitor is connected in parallel across the fifth resistor; the collector or emitter of the third transistor is the fifth connection terminal of the second switching element; the emitter or collector of the third transistor is the sixth connection terminal of the second switching element.

12. The infrared touch frame according to any one of claims 1 to 9, wherein: The voltage buffer module includes a voltage buffer element, a first resistor, and a second resistor; The input terminal of the voltage buffer element is the input terminal of the voltage buffer module; the first connection terminal of the voltage buffer element is connected to the first terminal of the first resistor, and the second terminal of the first resistor is the common terminal of the voltage buffer module; the second connection terminal of the voltage buffer element is the output terminal of the voltage buffer module, and the second connection terminal of the voltage buffer element is also grounded via the second resistor.

13. The infrared touch frame according to claim 12, wherein: The voltage buffer element includes a first field-effect transistor; the gate of the first field-effect transistor is the input terminal of the voltage buffer element; the drain or source of the first field-effect transistor is the first connection terminal of the voltage buffer element; the source or drain of the first field-effect transistor is the second connection terminal of the voltage buffer element. or, The voltage buffer element includes a first transistor; the base of the first transistor is the input terminal of the voltage buffer element; the collector or emitter of the first transistor is the first connection terminal of the voltage buffer element; the emitter or collector of the first transistor is the second connection terminal of the voltage buffer element.

14. The infrared touch frame according to any one of claims 1 to 9, wherein: The gain amplification module includes a gain amplification component and a sixth resistor; The input terminal of the gain amplifier is the input terminal of the gain amplification module, and the input terminal of the gain amplifier is connected to the output terminal of the voltage buffer module via the sixth resistor; the common terminal of the gain amplifier is the common terminal of the gain amplification module; the output terminal of the gain amplifier is the output terminal of the gain amplifier.

15. The infrared touch frame according to claim 14, wherein: The gain amplifier includes a fourth transistor; the base of the fourth transistor is the input terminal of the gain amplifier; the collector or emitter of the fourth transistor is the output terminal of the gain amplifier; the emitter or collector of the fourth transistor is the common terminal of the gain amplifier. or, The gain amplification module includes a fourth field-effect transistor; the gate of the fourth field-effect transistor is the input terminal of the gain amplification device; the drain or source of the fourth field-effect transistor is the output terminal of the gain amplification device; and the source or drain of the fourth field-effect transistor is the common terminal of the gain amplification device.

16. An interactive flat panel, wherein, Includes the infrared touch frame as described in any one of claims 1-15.

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