Infrared touch screen and touch device

Abstract

The present disclosure relates to an infrared touch screen and a touch device. The infrared touch screen, by setting controllable time-division multiplexing first channel switching devices and / or second channel switching devices on each block of lamp panels, realizes step-by-step transmission of driving signals between adjacent lamp panels through limited connection channels of a connector, realizes scanning of the infrared touch screen through the step-by-step transmission of the driving signals, so that the connection channels of the connector do not need to be matched with the number of driving buses one by one. The number of connection channels of the connector between each lamp panel is no longer limited by the number of driving buses between the lamp panels, and a connector with fewer connection channels can be used to connect two lamp panels to realize cascading, which helps to narrow the frame size of the infrared touch screen.

Description

Technical Field

[0001] This disclosure relates to the field of touch screen technology, and in particular to an infrared touch screen and touch device. Background Technology

[0002] A touchscreen is a device that uses infrared emitting lamps to emit infrared light, which is then received by infrared receiving lamps and converted into electrical signals. A processor then detects the strength of these signals to enable touch functionality. A touchscreen is typically composed of multiple LED panels connected together. The larger the touchscreen, the more LED panels are needed. These panels are linked together via connectors. Generally, the number of connection channels in the connector matches the number of drive buses between the LED panels. Therefore, connector selection is limited by the number of drive buses between the LED panels, and may also limit the size of the touchscreen's bezel due to the connector dimensions. Summary of the Invention

[0003] Based on this, the present disclosure provides an infrared touch screen and a touch device. The number of connection channels of the connectors between the various lamp boards of the infrared touch screen is no longer limited by the number of drive buses between the lamp boards. Connectors with fewer connection channels can be used to connect two lamp boards to achieve cascading, which helps to narrow the bezel size of the infrared touch screen.

[0004] According to a first aspect of this disclosure, an infrared touch screen is provided, comprising at least two light panels and at least one connector, wherein the light panels are spliced ​​together to form a touch frame, and the connector is connected between two adjacent light panels;

[0005] Each lamp panel is equipped with a signal transmission module and several lamp tubes; the signal transmission module has several signal output terminals and several signal input terminals; several of the lamp tubes are connected to the signal output terminals of the signal transmission module.

[0006] Each lamp panel is equipped with at least a first channel switching device or a second channel switching device;

[0007] Each lamp panel can be connected to an adjacent lamp panel via the first channel switching device and / or the second channel switching device, as well as the connector between the lamp panels. Several lamp panels are connected in sequence to form a signal transmission channel for transmitting drive signals.

[0008] The first channel switching device and the second channel switching device are used to connect to the controller to receive the channel switching signal output by the controller to switch the working state and realize time-division multiplexing;

[0009] Based on two adjacent light panels, the second channel switching device on the current light panel and the first channel switching device on the previous light panel receive the first channel switching signal output by the controller and operate in the first state, so that the signal input terminal of the signal transmission module on the current light panel is connected to the signal output terminal of the signal transmission module of the previous light panel through the second channel switching device, the connector, and the first channel switching device on the previous light panel, to obtain the first driving signal output by the signal transmission module of the previous light panel, and drive several lamps on the current light panel to work through the first driving signal;

[0010] Based on two adjacent lamp panels, the second channel switching device on the current lamp panel and the first channel switching device on the previous lamp panel receive the second channel switching signal output by the controller and operate in the second state. This enables the signal input terminal of the signal transmission module on the current lamp panel to connect with the signal output terminal of the signal transmission module on the previous lamp panel through the second channel switching device, the connector, and the first channel switching device on the previous lamp panel. This allows the second driving signal output by the signal transmission module on the previous lamp panel to be obtained, and the second driving signal is used to drive several lamps on the current lamp panel to work.

[0011] According to a second aspect of this disclosure, a touch device is provided, including an infrared touchscreen as described in any of the above embodiments.

[0012] In the embodiments disclosed above, by setting controllable time-division multiplexing first channel switching device and / or second channel switching device on each lamp board, and cooperating with the limited number of connection channels of the connector, the drive signal between adjacent lamp boards is transmitted step by step. The scanning of the infrared touch screen is achieved through the step-by-step transmission of the drive signal, so that the connection channels of the connector do not need to be matched one-to-one with the number of drive buses. The number of connection channels of the connector between each lamp board is no longer limited by the number of drive buses between lamp boards. Connectors with fewer connection channels can be selected to connect two lamp boards to achieve cascading, which helps to narrow the bezel size of the infrared touch screen.

[0013] To better understand and implement this disclosure, the technical solution is described in detail below with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an infrared touchscreen provided in one embodiment of the present disclosure;

[0015] Figure 2 This is a schematic diagram of the connection between adjacent light panels provided in one embodiment of the present disclosure;

[0016] Figure 3 This is a schematic diagram illustrating the connection principle of adjacent light panels according to an embodiment of the present disclosure;

[0017] Figure 4 This is a schematic diagram of the high and low level transformation of a channel switching signal provided in one embodiment of the present disclosure;

[0018] Figure 5 A schematic diagram of the driving principle of an emitting lamp provided in one embodiment of this disclosure;

[0019] Figure 6 A schematic diagram of the driving principle of a receiving lamp provided in one embodiment of this disclosure;

[0020] Figure 7 This is a schematic diagram of the installation of an infrared touchscreen controller according to an embodiment of the present disclosure;

[0021] Figure 8 This is a schematic diagram of the structure of a touch device provided in one embodiment of the present disclosure.

[0022] The following are the labels in the diagram: 10, lamp board; 11, signal transmission module; 111, first shift register; 112, decoder; 113, second shift register; 12, first channel switching device; 13, second channel switching device; 14, lamp tube; 20, connector; 30, controller. Detailed Implementation

[0023] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings, and not all of them.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0025] The following are several specific embodiments to illustrate the technical solutions of this application in detail. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an infrared touchscreen provided in one embodiment of the present disclosure.

[0027] An infrared touchscreen includes several light panels 10, which are arranged sequentially and spliced ​​together to form an infrared touchscreen bezel. Each light panel 10 can be an infrared emitting light panel or an infrared receiving light panel, or the infrared emitting light panel and the infrared receiving light panel can be integrated on the same light panel 10, that is, the infrared emitting lamp 14 and the infrared receiving lamp 14 are installed on the same light panel 10. Every two light panels 10 that need to be spliced ​​end to end are connected by a connector 20. Typically, the number of connection channels of the connector 20 is the same as the number of drive buses between the light panels 10. Therefore, the selection of the connector 20 is limited by the number of drive buses between the light panels 10. If the selection of the connector 20 is limited, its size is also limited, which may lead to a limitation on the bezel size of the infrared touchscreen.

[0028] To address the aforementioned issues, this disclosure provides an infrared touchscreen and a touch device. The number of connection channels of the connectors 20 between the various lamp boards 10 of the infrared touchscreen is no longer limited by the number of drive buses between the lamp boards 10. Connectors 20 with fewer connection channels can be used to connect two lamp boards 10 to achieve cascading, which helps to narrow the bezel size of the infrared touchscreen.

[0029] The various embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0030] Please see Figure 2 , Figure 2 This is a schematic diagram of the connection between adjacent light panels according to an embodiment of the present disclosure.

[0031] The infrared touch screen includes at least two light panels 10 and at least one connector 20. The light panels 10 are spliced ​​together to form a touch frame. The connector 20 is connected between two adjacent light panels 10 for the transmission of drive signals between the two adjacent light panels 10. The light panels 10 are cascaded to transmit the drive signals sequentially, thereby realizing the touch signal scanning and detection of the entire infrared touch screen.

[0032] Each lamp panel 10 is equipped with a signal transmission module 11 and several lamp tubes 14; the signal transmission module 11 has several signal output terminals and several signal input terminals; the several lamp tubes 14 are connected to the signal output terminals of the signal transmission module 11 and are lit when a drive signal is received. The several lamp tubes 14 are arranged in an M-row * N-column array.

[0033] If the light board 10 is an infrared emitting light board 10, then the signal transmission module 11 includes an infrared emitting circuit, and the light board 10 is provided with an infrared emitting lamp 14 connected to the signal output terminal of the infrared emitting circuit; if the light board 10 is an infrared receiving light board 10, then the signal transmission module 11 includes an infrared receiving circuit, and the light board 10 is provided with an infrared receiving lamp 14 connected to the signal output terminal of the infrared receiving circuit; if the light board 10 integrates the functions of the infrared emitting light board 10 and the infrared receiving light board 10, then the signal transmission module 11 includes an infrared emitting circuit and an infrared receiving circuit, as well as an infrared emitting lamp 14 connected to the signal output terminal of the infrared emitting circuit and an infrared receiving lamp 14 connected to the signal output terminal of the infrared receiving circuit.

[0034] The signal transmission module 11 can be connected to the controller 30 or the previous lamp board 10 to obtain a driving signal, and transmit the driving signal to the signal transmission module 11 of the next lamp board 10, while driving the corresponding lamp tube 14 on its lamp board 10 to work.

[0035] Each lamp panel 10 is provided with at least a first channel switching device 12 and / or a second channel switching device 13; each lamp panel 10 can be connected to an adjacent lamp panel 10 through the first channel switching device 12 and / or the second channel switching device 13, and the connector 20 between lamp panels 10, and a plurality of lamp panels 10 are connected in sequence to form a signal transmission channel for transmitting drive signals.

[0036] The first channel switching device 12 and the second channel switching device 13 are connected to the controller 30 to receive the channel switching signal output by the controller 30 to switch the working state and realize time-division multiplexing, thereby sending different driving signals to each lamp board 10 in time-division, driving the corresponding lamp tube 14 on each lamp board 10 to work and realize touch scanning detection.

[0037] Based on two adjacent lamp panels 10, the second channel switching device 13 on the current lamp panel 10 and the first channel switching device 12 on the previous lamp panel 10 receive the first channel switching signal output by the controller 30 and operate in a first state. This allows the signal input terminal of the signal transmission module 11 on the current lamp panel 10 to connect with the signal output terminal of the signal transmission module 11 on the previous lamp panel 10 through the second channel switching device 13, the connector 20, and the first channel switching device 12 on the previous lamp panel 10. This obtains the first driving signal output by the signal transmission module 11 of the previous lamp panel 10, and drives several lamp tubes 14 on the current lamp panel 10 to operate using the first driving signal. This method allows the first driving signal to be sequentially transmitted to each lamp panel 10, driving the corresponding several lamp tubes 14 on each lamp panel 10 to operate. The first driving signal can be a transmit driving signal or a receive driving signal.

[0038] Based on two adjacent lamp panels 10, the second channel switching device 13 on the current lamp panel 10 and the first channel switching device 12 on the previous lamp panel 10 receive the second channel switching signal output by the controller 30 and operate in a second state. This allows the signal input terminal of the signal transmission module 11 on the current lamp panel 10 to connect with the signal output terminal of the signal transmission module 11 on the previous lamp panel 10 through the second channel switching device 13, the connector 20, and the first channel switching device 12 on the previous lamp panel 10. This obtains the second driving signal output by the signal transmission module 11 of the previous lamp panel 10, and drives several lamp tubes 14 on the current lamp panel 10 to operate using the second driving signal. This method allows the second driving signal to be sequentially transmitted to each lamp panel 10, driving the corresponding number of lamp tubes 14 on each lamp panel 10 to operate. The second driving signal can be a transmit driving signal or a receive driving signal.

[0039] In the above embodiments of this disclosure, by setting a first channel switching device 12 and / or a second channel switching device 13 with controllable time-division multiplexing on each lamp board 10, and cooperating with the limited number of connection channels of the connector 20, the drive signal between adjacent lamp boards 10 is transmitted step by step. The scanning of the infrared touch screen is achieved through the step-by-step transmission of the drive signal, so that the connection channels of the connector 20 do not need to be matched one-to-one with the drive bus. The number of connection channels of the connector 20 between each lamp board 10 is no longer limited by the number of drive buses between the lamp boards 10. Connectors 20 with fewer connection channels can be selected to connect two lamp boards 10 to achieve cascading, which helps to narrow the bezel size of the infrared touch screen.

[0040] In an optional embodiment, please refer to Figure 3 , Figure 3 This is a schematic diagram illustrating the connection principle of adjacent light panels according to an embodiment of the present disclosure.

[0041] The first channel switching device 12 includes a first controlled terminal (SE1), a first signal terminal (A0~A3), a second signal terminal (B0~B3) and a third signal terminal (AB0~AB3), and the second channel switching device 13 includes a second controlled terminal (SE2), a fourth signal terminal (AB0~AB3), a fifth signal terminal (A0~A3) and a sixth signal terminal (B0~B3).

[0042] Optionally, the first channel switching device 12 and the second channel switching device 13 may have a plurality of switching channels, for example, four switching channels. Each of the four switching channels can achieve time-division multiplexing of the channel under the control of the channel switching signal. In other embodiments, other numbers of switching channels may be provided; the specific value is not limited.

[0043] The first controlled terminal (SE1) and the second controlled terminal (SE2) are used to connect to the controller 30. The first signal terminal and the second signal terminal are connected to each signal output terminal of the signal transmission module 11 of their respective lamp boards 10. The third signal terminal is connected to the fourth signal terminal through the connector 20. The fifth signal terminal and the sixth signal terminal are connected to each signal input terminal of the signal transmission module 11 of their respective lamp boards 10.

[0044] The first controlled terminal (SE1) and the second controlled terminal (SE2) can be connected to the controller 30 via wired or wireless connection. For example, they can be connected to the signal output terminal of the controller 30 via wires.

[0045] The first controlled terminal (SE1) receives the first channel switching signal output by the controller 30 and operates in the first state, so that the third signal terminal is connected to the first signal terminal. The second controlled terminal receives the first channel switching signal output by the controller 30 and operates in the first state, so that the fourth signal terminal is connected to the fifth signal terminal.

[0046] The first controlled terminal (SE2) receives the second channel switching signal output by the controller 30 and operates in the second state, connecting the third signal terminal with the second signal terminal. The second controlled terminal receives the second channel switching signal output by the controller 30 and operates in the second state, connecting the fourth signal terminal with the sixth signal terminal.

[0047] The first channel switching signal and the second channel switching signal can be different driving signals issued by the controller 30 in a time-sharing manner, or they can be the same timing signal with regular high and low level changes issued by the controller 30. In this case, the first channel switching device 12 is driven by a high level or a low level, and the second channel switching device 13 is driven by a high level or a low level, thereby realizing the working state control of the first channel switching device 12 and the second channel switching device 13. The working states of the first channel switching device 12 and the second channel switching device 13 need to be switched synchronously to cooperate with the connector 20 to form a signal transmission channel between adjacent lamp boards 10.

[0048] Optionally, the first channel switching device 12 is a single-pole double-throw (SPD) switch, and / or the second channel switching device 13 is a SPD switch. The SPD switch can be an integrated SPD switch or a combination of multiple discrete SPD switches. The SPD switch has several sets of switching channels, such as four sets of switching channels. If the number of signal output terminals or signal input terminals of the signal transmission module 11 is greater than the number of switching channels of the SPD switch, then some or all of the switching channels must be matched to achieve time-division multiplexing.

[0049] Please see Figure 4 , Figure 4 This is a schematic diagram of the high and low level transformation of a channel switching signal provided in one embodiment of the present disclosure.

[0050] In an optional embodiment, when the timing signal SE received simultaneously by the first controlled terminal and the second controlled terminal is H (times 0-t0 and t1-t2), the switches of the first channel switching device 12 and the second channel switching device 13 are switched to terminal A, connecting the third signal terminal and the first signal terminal, and disconnecting the third signal terminal and the second signal terminal, thereby allowing the corresponding drive signals (DATAT_OUT\CLK_T\DATAR_OUT\CLK_R) to pass through and flow to the signal transmission module 11 of the next lamp board 10. When the timing signal SE received simultaneously by the first controlled terminal and the second controlled terminal is L (times t0-t1 and t2-t3), the switches of the first channel switching device 12 and the second channel switching device 13 are switched to terminal B, connecting the third signal terminal and the second signal terminal, and disconnecting the third signal terminal and the first signal terminal, thereby allowing the corresponding drive signals (RH3\RH2\RH1\RH0) to pass through and flow to the signal transmission module 11 of the next lamp board 10. This method of using multiple single-pole double-throw switches in combination with switching timing to achieve time-division multiplexing allows signals to pass through switch channels AB0\AB1\AB2\AB3 in a time-division manner, which can effectively solve the problem of too many drive buses and insufficient number of ports of connector 20.

[0051] In other embodiments, the drive signal transmitted through the multiplexed channel can be determined according to the actual circuit requirements, and is not limited in this disclosure.

[0052] Optionally, the connector 20 has several connection channels, and the number of signal output terminals or signal input terminals of the signal transmission module 11 is greater than the number of connection channels of the connector 20. In this case, some or all connection channels can be matched to achieve time-division multiplexing.

[0053] Connector 20 can be a mating male and female connector, a PFC flexible flat cable, a pin connector, or other types of connectors. In this embodiment, the structure of connector 20 is not limited.

[0054] In an optional embodiment, the signal transmission module 11 includes an infrared transmitting circuit and / or an infrared receiving circuit.

[0055] If each lamp board 10 is an infrared emitting lamp board 10, each infrared emitting lamp board 10 is equipped with an infrared emitting circuit and an infrared emitting lamp tube 14. The signal input terminal of the infrared emitting circuit of the current lamp board 10 can be connected to the signal output terminal of the infrared emitting circuit of the previous lamp board 10 through the second channel switching device 13, the connector 20, and the first channel switching device 12 of the previous lamp board 10, to receive the infrared emitting drive signal transmitted by the previous lamp board 10. The signal output terminal of the infrared emitting circuit of the current lamp board 10 can be connected to the signal input terminal of the infrared emitting circuit of the next lamp board 10 through the first channel switching device 12, the connector 20, and the second channel switching device 13 of the next lamp board 10, to transmit the infrared emitting drive signal to the next lamp board 10, thereby transmitting the infrared emitting drive signal step by step to each lamp board 10 to drive the infrared emitting lamp tube 14 to work.

[0056] If each lamp board 10 is an infrared receiving lamp board 10, each infrared receiving lamp board 10 is equipped with an infrared receiving circuit and an infrared receiving lamp tube 14. The signal input terminal of the infrared receiving circuit of the current lamp board 10 can be connected to the signal output terminal of the infrared receiving circuit of the previous lamp board 10 through the second channel switching device 13, the connector 20, and the first channel switching device 12 of the previous lamp board 10, to receive the infrared receiving drive signal transmitted by the previous lamp board 10. The signal output terminal of the infrared receiving circuit of the current lamp board 10 can be connected to the signal input terminal of the infrared receiving circuit of the next lamp board 10 through the first channel switching device 12, the connector 20, and the first channel switching device 12 of the next lamp board 10, to transmit the infrared receiving drive signal to the next lamp board 10, thereby transmitting the infrared receiving drive signal step by step to each lamp board 10 to drive the infrared receiving lamp tube 14 to work.

[0057] The signal output terminal of the infrared emitting circuit is also connected to the emitting lamp 14, and the signal output terminal of the infrared receiving circuit is also connected to the receiving lamp 14.

[0058] In an optional embodiment, please refer to Figure 5 and 6 , Figure 5 A schematic diagram of the driving principle of an emitting lamp provided in one embodiment of this disclosure; Figure 6 This is a schematic diagram of the driving principle of a receiving lamp provided in one embodiment of the present disclosure.

[0059] The infrared emitting circuit includes a first shift register 111 and a decoder 112.

[0060] The first shift registers 111 on two adjacent lamp boards 10 are cascaded through the first channel switching device 12, the connector 20, and the second channel switching device 13 to transmit the transmission line control signal to each lamp board 10.

[0061] The decoders 112 on two adjacent lamp boards 10 are cascaded through the first channel switching device 12, the connector 20, and the second channel switching device 13 to transmit the transmission column control signal to each lamp board 10.

[0062] The infrared receiving circuit includes a second shift register 113. The second shift registers 113 on two adjacent lamp boards 10 are cascaded through the first channel switching device 12, the connector 20, and the second channel switching device 13 to transmit the received row control signal to each lamp board 10.

[0063] The first channel switching device 12 is used to connect to the output terminal of the controller 30, receive the receive column control signal output by the controller 30, and transmit it to the next lamp board 10 through the connector 20.

[0064] Each shift register has a gating input and several gating outputs. The gating input is used to connect to the output of the shift register of the previous lamp board 10, and each gating output of the shift register is connected to a corresponding lamp tube 14.

[0065] Each shift register has a data input port (strobe input), a data output port (strobe output), and a clock port. Several shift registers can be cascaded through their data output and input ports. Since data transmission is serial, data signals can be transmitted from one data output port to the data input port of the next shift register. Data shifting in the shift registers is controlled by a clock signal. If the clock signal is triggered by a rising edge, the data shifts forward by one bit when the clock signal rises from low to high. Multiple data output ports simultaneously output signals to drive the infrared photodiode connected to the back end, enabling touch scanning. The shift register 15 can have 1, 2, 4, 6, 8, or 16 bits of data. In this embodiment, an 8-bit shift register can be selected.

[0066] Each decoder 112 has a drive input terminal and several drive output terminals. The drive input terminal is used to connect to the output terminal of the decoder 112 of the previous lamp board 10. Each drive output terminal of the decoder 112 is connected to a corresponding lamp tube 14.

[0067] Decoding is the reverse process of encoding. Encoding converts a signal into binary code, while decoding converts binary code into specific signals. A logic circuit that converts input binary code into specific high (low) level signals for output is called a decoder. Assuming a decoder has n input signals and n output signals, if n = 2^n, it is called a full decoder, also known as a binary decoder. Common full decoders include 2-to-4 line decoders, 3-to-8 line decoders, and 4-to-16 line decoders. If n < 2^n, it is called a partial decoder, such as a binary-to-decimal decoder (also known as a 4-to-10 decoder) or a display decoder.

[0068] A 3-to-8 line decoder is a type of full decoder (binary decoder). The input to a full decoder is a 3-bit binary code. Since there are 8 possible combinations of 3-bit binary code, the output consists of 8 output signals corresponding one-to-one with these 8 combinations. The decoder translates each binary code combination into a high (low) level signal on a corresponding output line. In this embodiment, decoder 112 can be a 3-to-8 decoder; in other embodiments, decoder 112 can be a decoder of a different type.

[0069] In an optional embodiment, if each lamp board 10 is equipped with both an infrared emitting circuit and an infrared receiving circuit, when the infrared emitting circuit transmits the infrared emitting drive signal to the next lamp board 10, it requires 6 transmit drive signal buses (clock signal CLK_T, data signal DATA_T, decoder 112 address lines A0, A1, and A2, and enable line EN); when the infrared receiving circuit transmits the infrared receiving drive signal to the next lamp board 10, it requires 8 receive drive signal buses (clock signal CLK_R, data signal DATA_R, receive column control signals RH0, RH1…Q5), plus 4 power signal lines. Therefore, a total of 18 signal transmission channels are needed to achieve cascaded transmission of drive signals. If, due to limitations such as the size of the touchscreen bezel or other reasons, only a connector 20 with 14 connection channels can be selected, there will be a problem of insufficient connection channels for the connector 20.

[0070] Therefore, a first channel switching device 12 and / or a second channel switching device 13 are added to each lamp board 10. Under the control of the channel switch switching signal, each channel on the channel switching device can be time-division multiplexed. For example, the first channel switching device 12 and the second channel switching device 13 are provided with four channels. At the first moment, the four channels can be used to transmit the first driving signal, and at the second moment, the four channels can be used to transmit the second driving signal, thereby realizing channel multiplexing. This enables the connector 20 with 14 connecting channels to meet the transmission of 18 driving signals and realize the cascaded driving of several lamp boards 10.

[0071] Based on the above embodiments, the infrared touch screen also includes a controller 30, which is disposed on any of the light panels 10.

[0072] like Figure 1 As shown, the controller 30 can be set on the lamp board 1. The controller 30 sends an infrared drive signal to the signal transmission module 11 on the lamp board 1. The signal transmission module 11 divides the infrared drive signal into two paths. One path transmits the infrared drive signal sequentially to the lamp board 2, lamp board 3 and lamp board 4 through the inter-board connector 20. The other path transmits the infrared drive signal sequentially to the lamp board 6 and lamp board 5 through the inter-board connector 20, thereby realizing the cascaded drive of each lamp board 10, and thus realizing the touch scanning detection of the touch screen.

[0073] The controller 30 can be mounted on the lamp board 1, which serves as the starting point for the drive signal. The signal transmission module 11 on the lamp board 1 can directly connect to the controller 30 to obtain the infrared drive signal, without needing to obtain it from the preceding lamp board 10. Therefore, the lamp board 1 does not need a second channel switching device 13 for connecting to the preceding lamp board 10; only a first channel switching device 12 is needed to transmit the infrared drive signal to the following lamp board 10. Lamp boards 4 and 5 are end boards, representing the end of the drive signal transmission. They do not need to transmit infrared drive signals to the rear end; therefore, the lamp boards 4 and 5 do not need a first channel switching device 12; only a second channel switching device 13 is needed.

[0074] like Figure 7 As shown, the controller 30 can be set on the lamp board 5. The controller 30 sends an infrared drive signal to the signal transmission module 11 on the lamp board 5. The signal transmission module 11 then transmits the infrared drive signal sequentially to the lamp board 6, lamp board 1, lamp board 2, lamp board 3 and lamp board 4 through the inter-board connector 20, thereby realizing the cascaded drive of each lamp board 10, and thus realizing the touch scanning detection of the touch screen.

[0075] The controller 30 can be mounted on the lamp board 5, which serves as the starting point for initiating the drive signal. The signal transmission module 11 on the lamp board 5 can directly connect to the controller 30 to obtain the infrared drive signal, without needing to obtain it from the front end. Therefore, the lamp board 5 does not need a second channel switching device 13 for connecting to the preceding lamp board 10; only a first channel switching device 12 is needed to transmit the infrared drive signal to the following lamp board 10. The lamp board 4 is the end board, representing the end of the drive signal transmission. It does not need to transmit the infrared drive signal to the rear end; therefore, the lamp board 4 does not need a first channel switching device 12; only a second channel switching device 13 is needed.

[0076] In the embodiments disclosed above, by setting controllable time-division multiplexing first channel switching device and / or second channel switching device on each lamp board, and cooperating with the limited number of connection channels of the connector, the drive signal between adjacent lamp boards is transmitted step by step. The scanning of the infrared touch screen is achieved through the step-by-step transmission of the drive signal, so that the connection channels of the connector do not need to be matched one-to-one with the number of drive buses. The number of connection channels of the connector between each lamp board is no longer limited by the number of drive buses between lamp boards. Connectors with fewer connection channels can be selected to connect two lamp boards to achieve cascading, which helps to narrow the bezel size of the infrared touch screen.

[0077] According to a second aspect of this embodiment, a touch device is provided. For example... Figure 8 As shown, the touch device 800 includes an infrared touchscreen 801 as described in any of the above embodiments. The touch device 800 may also include a device processor 802 and a display screen 803. After detecting an infrared touch signal, the infrared touchscreen 801 sends the infrared touch signal to the device processor 802. The device processor 802 controls the display screen 803 to display the corresponding writing trajectory or make a touch response based on the infrared touch signal.

[0078] Touch devices can be interactive whiteboards, smart blackboards, smart whiteboards, central control devices, and other electronic devices that can achieve touch functionality.

[0079] The aforementioned infrared touchscreen is used in the touch device. By setting controllable time-division multiplexing first channel switching devices and / or second channel switching devices on each lamp board, and cooperating with the limited number of connection channels of the connector, the drive signals between adjacent lamp boards are transmitted step by step. The scanning of the infrared touchscreen is achieved through the step-by-step transmission of drive signals, so that the connection channels of the connector do not need to be matched one-to-one with the number of drive buses. The number of connection channels of the connector between each lamp board is no longer limited by the number of drive buses between lamp boards. Connectors with fewer connection channels can be used to connect two lamp boards to achieve cascading, which helps to narrow the bezel size of the infrared touchscreen.

[0080] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. An infrared touchscreen, characterized in that, It includes at least two light panels and at least one connector, wherein the light panels are spliced ​​together to form a touch frame, and the connector is connected between two adjacent light panels; Each lamp panel is equipped with a signal transmission module and several lamp tubes; the signal transmission module has several signal output terminals and several signal input terminals; several of the lamp tubes are connected to the signal output terminals of the signal transmission module. Each lamp panel is equipped with at least a first channel switching device or a second channel switching device; Each lamp panel can be connected to an adjacent lamp panel via the first channel switching device and / or the second channel switching device, as well as the connector between the lamp panels. Several lamp panels are connected in sequence to form a signal transmission channel for transmitting drive signals. The first channel switching device and the second channel switching device are used to connect to the controller to receive the channel switching signal output by the controller to switch the working state and realize time-division multiplexing; Based on two adjacent light panels, the second channel switching device on the current light panel and the first channel switching device on the previous light panel receive the first channel switching signal output by the controller and operate in the first state, so that the signal input terminal of the signal transmission module on the current light panel is connected to the signal output terminal of the signal transmission module of the previous light panel through the second channel switching device, the connector, and the first channel switching device on the previous light panel, to obtain the first driving signal output by the signal transmission module of the previous light panel, and drive several lamps on the current light panel to work through the first driving signal; Based on two adjacent lamp panels, the second channel switching device on the current lamp panel and the first channel switching device on the previous lamp panel receive the second channel switching signal output by the controller and operate in the second state. This enables the signal input terminal of the signal transmission module on the current lamp panel to connect with the signal output terminal of the signal transmission module on the previous lamp panel through the second channel switching device, the connector, and the first channel switching device on the previous lamp panel. This allows the second driving signal output by the signal transmission module on the previous lamp panel to be obtained, and the second driving signal is used to drive several lamps on the current lamp panel to work.

2. The infrared touchscreen according to claim 1, characterized in that, The first channel switching device includes a first controlled terminal, a first signal terminal, a second signal terminal, and a third signal terminal; the second channel switching device includes a second controlled terminal, a fourth signal terminal, a fifth signal terminal, and a sixth signal terminal. The first controlled terminal and the second controlled terminal are used to connect to the controller. The first signal terminal and the second signal terminal are connected to the signal output terminal of the signal transmission module of the corresponding lamp board. The third signal terminal is connected to the fourth signal terminal through the connector. The fifth signal terminal and the sixth signal terminal are connected to the signal input terminal of the signal transmission module of the corresponding lamp board. The first controlled terminal receives the first channel switching signal output by the controller and operates in the first state, so that the third signal terminal is connected to the first signal terminal; the second controlled terminal receives the first channel switching signal output by the controller and operates in the first state, so that the fourth signal terminal is connected to the fifth signal terminal. The first controlled terminal receives the second channel switching signal output by the controller and operates in the second state, connecting the third signal terminal with the second signal terminal. The second controlled terminal receives the second channel switching signal output by the controller and operates in the second state, connecting the fourth signal terminal with the sixth signal terminal.

3. The infrared touchscreen according to claim 2, characterized in that, The first channel switching device is a single-pole double-throw switch, and / or the second channel switching device is a single-pole double-throw switch.

4. The infrared touchscreen according to claim 3, characterized in that, The single-pole double-throw switch has several sets of switching channels, and the number of signal output terminals or signal input terminals of the signal transmission module is greater than the number of switching channels of the single-pole double-throw switch.

5. The infrared touchscreen according to claim 1, characterized in that, The connector has several connection channels, and the number of signal output terminals or signal input terminals of the signal transmission module is greater than the number of connection channels of the connector.

6. The infrared touchscreen according to any one of claims 1 to 5, characterized in that, The signal transmission module includes an infrared transmitting circuit and / or an infrared receiving circuit; The signal input terminal of the infrared emitting circuit and / or infrared receiving circuit of the current lamp board is connected to the signal output terminal of the infrared emitting circuit and / or infrared receiving circuit of the previous lamp board through the second channel switching device, the connector, and the first channel switching device, so as to receive the infrared emitting drive signal and / or infrared receiving drive signal transmitted by the previous lamp board. The signal output terminal of the infrared emitting circuit is connected to an emitting lamp, and the signal output terminal of the infrared receiving circuit is connected to a receiving lamp.

7. The infrared touchscreen according to claim 6, characterized in that, The infrared emitting circuit includes a first shift register and a decoder; The first shift registers on two adjacent lamp boards are cascaded through the first channel switching device, the connector, and the second channel switching device to transmit the transmit line control signal to each lamp board; The decoders on two adjacent lamp boards are cascaded through the first channel switching device, the connector, and the second channel switching device to transmit the transmit column control signal to each lamp board.

8. The infrared touchscreen according to claim 6, characterized in that, The infrared receiving circuit includes a second shift register. The second shift registers on two adjacent lamp boards are cascaded through the first channel switching device, the connector, and the second channel switching device to transmit the received row control signal to each lamp board. The first channel switching device is used to connect to the output of the controller, receive the receive column control signal output by the controller, and transmit it to the next light panel through the connector.

9. The infrared touchscreen according to claim 1, characterized in that, It also includes a controller, which is mounted on any of the lamp panels.

10. A touch device, characterized in that, Including the infrared touchscreen as described in any one of claims 1 to 9.

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