Gain adjustment method for infrared signal, and gain adjustment circuit for infrared signal

Abstract

Embodiments of the present application provide a gain adjustment method for an infrared signal, and a gain adjustment circuit for an infrared signal. The method comprises: controlling a gain adjustment signal output module to output, within a first period of time, a gain adjustment signal corresponding to each infrared receiver among a first number of infrared receivers, and holding the output by means of a first signal holding module; and controlling the gain adjustment signal output module to directly output, within a second period of time, a gain adjustment signal corresponding to each infrared receiver among a second number of infrared receivers, so as to use the gain adjustment signal corresponding to each infrared receiver to perform gain adjustment on a received signal of the infrared receiver, so that the signal strength value of the received signal, which is subjected to gain adjustment, of the infrared receiver is within a target signal strength range. In this way, the present application reduces a signal strength difference between the received signals subjected to gain adjustment, and improves the accuracy of touch recognition.

Description

Infrared signal gain adjustment method and infrared signal gain adjustment circuit

[0001] The present application claims priority to the Chinese patent application No. 202410977410.5, filed on July 22, 2024, and entitled "Infrared signal gain adjustment method and infrared signal gain adjustment circuit", the content of which is incorporated herein by reference in its entirety; and the present application claims priority to the Chinese patent application No. 202421740121.5, filed on July 22, 2024, and entitled "Signal gain control circuit, infrared touch frame and touch device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of infrared touch technology, for example, to an infrared signal gain adjustment method and an infrared signal gain adjustment circuit. BACKGROUND

[0003] In an infrared touch frame, a plurality of infrared emitters and a plurality of infrared receivers are arranged on four edges of a frame body. The infrared emitters emit infrared signals, and the infrared receivers receive the infrared signals. Then, whether a touch operation occurs is calculated according to changes in the infrared signals received by the infrared receivers.

[0004] After receiving the infrared signals emitted by the same infrared emitter, the plurality of infrared receivers need to adjust the gain of the received signals by a gain adjustment signal, so that the signal intensity values of the received signals of the plurality of infrared receivers are adjusted to target values. When a user touches, the touch position of the user is determined according to the infrared signals actually received by the infrared receivers and the target values.

[0005] The applicant found in the process of implementing the present application that in the related art, after adjusting the signal intensity values of the received signals of the plurality of infrared receivers, the touch recognition accuracy is reduced. SUMMARY

[0006] To overcome the problems in the related art, the present application provides an infrared signal gain adjustment method and an infrared signal gain adjustment circuit, which can improve the touch recognition accuracy.

[0007] According to a first aspect of embodiments of the present application, an infrared signal gain adjustment method is provided, comprising the following steps:

[0008] controlling an infrared emitter to emit an infrared signal, and at least two infrared receivers to receive the infrared signal, to obtain corresponding received signals;

[0009] According to the received signal of each infrared receiver in the first part of infrared receivers, the gain adjustment signal output module is controlled to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers respectively in the first time period, and the output is kept through the first signal keeping module, so as to adjust the received signal of each infrared receiver in the first part of infrared receivers, and the intensity value of the adjusted received signal of each infrared receiver in the first part of infrared receivers is in the target signal intensity range.

[0010] According to the received signal of each infrared receiver in the second part of infrared receivers, the gain adjustment signal output module is controlled to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively in the second time period, so as to adjust the received signal of each infrared receiver in the second part of infrared receivers, and the intensity value of the adjusted received signal of each infrared receiver in the second part of infrared receivers is in the target signal intensity range; wherein the first time period is a time period in the infrared emitter off period, and the second time period is later than the first time period.

[0011] According to the second aspect of the embodiment of the present application, an infrared signal gain adjustment circuit is provided, which comprises a control module, at least two infrared receivers, a gain adjustment signal output module, a first signal keeping module and a signal gain adjustment module.

[0012] The control module comprises a first signal output end; the gain adjustment signal output module comprises an input end and a plurality of output ends; the first signal keeping module comprises a plurality of input ends and a plurality of output ends, and the signal gain adjustment module comprises a plurality of first signal input ends, a plurality of third signal input ends and a plurality of fourth signal input ends.

[0013] The control module is used to acquire the received signal of at least two infrared receivers in the last frame.

[0014] The first signal output end of the control module is connected with the first input end of the gain adjustment signal output module, each first output end of the gain adjustment signal output module is connected with a second input end of the first signal keeping module respectively, a second output end of the first signal keeping module is connected with a second signal input end of the signal gain adjustment module, and the control module is used to control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers respectively in the first time period of the last frame, and the output is kept through the first signal keeping module and output to the signal gain adjustment module.

[0015] Each first output end of the gain adjustment signal output module is further connected with a third signal input end of the signal gain adjustment module; the control module is configured to control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers to the signal gain adjustment module in the second time period of the previous frame according to the received signal of the second part of infrared receivers in the previous frame;

[0016] The at least two fourth signal input ends of the signal gain adjustment module are respectively connected with the at least two infrared receivers, and are configured to respectively adopt the gain adjustment signal corresponding to each infrared receiver to perform gain adjustment on the received signal of each infrared receiver in the current frame, so that the signal intensity value of the received signal of each infrared receiver in the current frame is in the target signal intensity range.

[0017] According to a third aspect of the embodiments of the present application, an infrared touch frame is provided, which comprises a frame body, a plurality of infrared emitters and the infrared signal gain adjustment circuit described above; the plurality of infrared emitters and the plurality of infrared receivers in the infrared signal gain adjustment circuit are respectively arranged at the side edges of the frame body; the at least two fourth signal input ends of the signal gain adjustment module are respectively connected with the at least two infrared receivers.

[0018] According to a fourth aspect of the embodiments of the present application, an infrared touch device is provided, which comprises a display screen and the infrared touch frame described above, and the infrared touch frame is arranged around the display screen.

[0019] The embodiments of the present application control the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers in the first time period, and the output is maintained through the first signal maintaining module; the gain adjustment signal output module is controlled to directly output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in the second time period, so that the received signal of each infrared receiver is gain-adjusted by using the gain adjustment signal corresponding to each infrared receiver, so that the signal intensity value of the gain-adjusted received signal of each infrared receiver is in the target signal intensity range, the signal intensity difference between the gain-adjusted received signals is reduced, and the touch recognition precision is improved.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application.

[0021] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a working principle diagram of an infrared touch frame in the related art;

[0023] FIG. 2 is a working principle diagram of another infrared touch frame in the related art;

[0024] FIG. 3 is a flow diagram of an infrared signal gain adjustment method according to an embodiment of the present application;

[0025] FIG. 4 is a structural diagram of an infrared signal gain adjustment circuit according to an embodiment of the present application;

[0026] FIG. 5 is a structural diagram of an infrared signal gain adjustment circuit according to another embodiment of the present application;

[0027] FIG. 6 is a circuit structural diagram of a first signal holding sub-module and a signal amplification sub-module in an infrared signal gain adjustment circuit according to an embodiment of the present application;

[0028] FIG. 7 is a structural diagram of an infrared signal gain adjustment circuit according to yet another embodiment of the present application;

[0029] FIG. 8 is a structural diagram of an infrared signal gain adjustment circuit according to yet another embodiment of the present application;

[0030] FIG. 9 is a structural diagram of an infrared touch frame according to an embodiment of the present application;

[0031] FIG. 10 is a structural diagram of an infrared touch device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0033] It should be noted that the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] In the following description, when referring to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0035] In the description of the present application, it should be understood that the terms "first", "second", "third" and the like are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. The above-mentioned terms can be understood according to the specific meaning in the present application by those skilled in the art. The singular forms "a", "said" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. The word "if" used herein can be interpreted as "when" or "when" or "in response to determining". In addition, in the description of the present application, "multiple" means two or more, unless otherwise specified. The association relationship between the associated objects described by "and / or" indicates that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0036] The infrared touch frame sets a plurality of infrared emitters and a plurality of infrared receivers on the four side frames of the frame body, then controls the infrared emitters to emit infrared signals, and the infrared receivers to obtain the infrared signals to obtain corresponding receiving signals. In this way, the infrared touch frame determines whether a touch operation occurs according to the changes of the receiving signals of each infrared receiver.

[0037] In the related art, there are mainly two ways to set infrared emitters and infrared receivers on the four side frames of the infrared touch frame: as shown in FIG. 1, one is that the infrared emitters and the infrared receivers are respectively arranged on opposite sides of the infrared touch frame; as shown in FIG. 2, the other is that the infrared emitters and the infrared receivers are staggered and arranged on the same side of the infrared touch frame, wherein in FIG. 1 and FIG. 2, the white circles represent the infrared emitters, and the black circles represent the infrared receivers.

[0038] At present, the infrared touch frame is mainly in a one-to-many scanning mode, that is, for each infrared emitter emitting an infrared signal, there are a plurality of infrared receivers corresponding to obtain the infrared signal to obtain corresponding receiving signals. Because the positions and angles between each infrared receiver and the infrared emitter are different, the signal intensity values of the corresponding receiving signals of the plurality of infrared receivers are also different, especially in the case that the infrared emitters and the infrared receivers are staggered and arranged on the same side of the infrared touch frame, the signal intensity values of the corresponding receiving signals of the infrared receivers at different positions differ greatly.

[0039] Therefore, it is necessary to adjust the signal strength value of the received signal corresponding to the plurality of infrared receivers to a target signal strength value, so that the infrared touch frame can determine the touch operation of the user according to the actual received signal strength value and the target signal strength value of each infrared receiver.

[0040] In the related art, a control module, a gain adjustment signal output module and a signal gain adjustment module are arranged in the infrared touch frame to perform gain adjustment.

[0041] The control module includes a signal output end; the gain adjustment signal output module includes an input end and a plurality of output ends; and the signal gain adjustment module includes a plurality of first signal input ends and a plurality of second signal input ends.

[0042] The signal output end of the control module is connected with the signal input end of the gain adjustment signal output module; each signal output end of the gain adjustment signal output module is connected with one first signal input end of the signal gain adjustment module in one-to-one correspondence, and the plurality of second signal input ends of the signal gain adjustment module are connected with the plurality of infrared receivers in one-to-one correspondence.

[0043] The control module is configured to acquire the received signal of each infrared receiver, and control the gain adjustment signal output module to output a gain adjustment signal matched with the signal strength of the received signal to the signal gain adjustment module according to the signal strength of each received signal; and the signal gain adjustment module receives the gain adjustment signal and adjusts the signal strength of the received signal of the infrared receiver.

[0044] In the related art, the gain adjustment signal output module is usually a module structure integrated in the control module. Due to the technical limitations of the control module, the number of gain adjustment signal output modules integrated in the control module is limited, and the number of signal output ends of the gain adjustment signal output module is also limited. However, the number of received signals is much larger than the number of signal output ends of the gain adjustment output module. Therefore, in the related art, the received signals obtained by each infrared receiver are divided into a plurality of groups, and each group shares one gain adjustment signal to achieve gain adjustment of the received signals.

[0045] The applicant found in the process of implementing the present application that, due to the different signal strengths of the received signals in each group, the signal strength difference of the received signals in each group after gain adjustment using one gain adjustment signal is still large, and there is a problem of decreased touch recognition accuracy.

[0046] The following will take an example of the infrared emitter and the infrared receiver being arranged in an interleaved manner on the same side of the infrared touch frame to illustrate the gain adjustment method of the related art.

[0047] As shown in FIG. 2, the infrared emitters and the infrared receivers are staggered and arranged on the same side of the infrared touch frame. The infrared emitter B emits an infrared signal, and the infrared receivers 1'-8' are synchronously turned on and acquire the infrared signal to obtain corresponding receiving signals a, b, c, d, e, f, g, h. Since the distances and angles from the infrared receivers 1'-8' to the infrared emitter B are different, the signal strengths of the receiving signals a, b, c, d, e, f, g, h acquired by the infrared receivers 1'-8' are different.

[0048] When the gain adjustment output module has four signal output ports and performs gain adjustment, the four signal output ports of the gain adjustment output module output four different gain adjustment signals A, B, C, D, respectively. The four different gain adjustment signals A, B, C, D are received by the four first signal input ports of the signal gain adjustment module. The eight second signal input ports of the signal gain adjustment module receive the receiving signals a, b, c, d, e, f, g, h sent by the infrared receivers 1'-8'. At this time, the receiving signals a, b, c, d, e, f, g, h are divided into four groups. The first group of receiving signals

a, h

b, g

c, f

d, e

[0049] Therefore, the embodiment of the present application controls the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers in the first time period, and the gain adjustment signal is output by the first signal holding module. The gain adjustment signal output module directly outputs the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in the second time period. Thus, the receiving signal of each infrared receiver is gain-adjusted by the gain adjustment signal corresponding to each infrared receiver, so that the signal strength value of the gain-adjusted receiving signal of each infrared receiver is in the target signal strength range, the signal strength difference between the gain-adjusted receiving signals is reduced, and the touch recognition accuracy is improved.

[0050] Please refer to FIG. 3, which is a flowchart of the infrared signal gain adjustment method according to the embodiment of the present application. The method includes the following steps:

[0051] S10: Control the infrared emitter to emit an infrared signal, and control at least two infrared receivers to receive the infrared signal to obtain corresponding receiving signals.

[0052] The infrared signal gain adjustment method can be executed by the infrared touch frame. The infrared touch frame comprises a control module. The control module is used for gain adjustment of the infrared receiver.

[0053] According to different control logics, the infrared emitter of the infrared touch frame can be sequentially turned on, and the infrared receiver corresponding to the infrared emitter can be controlled to synchronously receive, and the receiving signal of each infrared receiver can be controlled to be gain adjusted.

[0054] S20: According to the receiving signal of each infrared receiver in the first part of infrared receivers, the gain adjustment signal output module is controlled to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers at a first time period, and the output is kept by the first signal keeping module, so as to adjust the receiving signal of each infrared receiver in the first part of infrared receivers, and the intensity value of the adjusted receiving signal of each infrared receiver in the first part of infrared receivers is in the target signal intensity range.

[0055] In an embodiment, the gain adjustment signal output module comprises a plurality of first output ends; each first output end corresponds to two infrared receivers, and the control module controls each first output end of the gain adjustment signal output module to send different gain adjustment signals at the first time period and the second time period, so that each infrared receiver is adjusted according to the respective different gain adjustment signals.

[0056] The gain adjustment signal corresponding to the infrared receiver refers to the gain adjustment signal matched with the signal intensity value of the receiving signal obtained by the infrared receiver. The matching means that the receiving signal obtained by each infrared receiver can reach the target signal intensity range after gain adjustment based on the respective gain adjustment signal. For example, the signal intensity value of the receiving signal obtained by each infrared receiver can be adjusted to the target signal intensity value by using the respective gain adjustment signal.

[0057] In an embodiment, the corresponding gain adjustment signal of each infrared receiver in the first part of infrared receivers can be determined each time the initialization is started or the environment is changed, and then the corresponding gain adjustment signal can be directly called in the working process.

[0058] In one embodiment, the control module controls the infrared emitter to emit an infrared signal at each power-on initialization or when the environment changes, and then the control module samples the received signal of the first part of the infrared receivers multiple times to obtain multiple received signals of the first part of the infrared receivers; for each infrared receiver in the first part of the infrared receivers, the signal strength values of the multiple received signals are averaged to obtain the average signal strength value of each infrared receiver in the first part of the infrared receivers, and the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receivers is obtained according to the difference between the average signal strength value of each infrared receiver in the first part of the infrared receivers and the set target signal strength value; then, in the subsequent gain adjustment process, each first output end of the gain adjustment signal output module outputs the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receivers respectively in a first time period, and the signal gain adjustment module respectively adjusts the received signal of each infrared receiver in the first part of the infrared receivers in real time according to the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receivers.

[0059] In another embodiment, the initial gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receivers is determined at each power-on initialization or when the environment changes, and then the control module obtains the received signal of the first part of the infrared receivers in the last frame, and controls the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receivers according to the received signal of the first part of the infrared receivers and the initial gain adjustment signal before obtaining the received signal of the current frame.

[0060] In one embodiment, at each power-on initialization or when the environment changes, the control module controls the gain adjustment signal output module to output an initial gain adjustment signal to the signal gain adjustment module for the first frame of the received signal of each infrared receiver in the first part of infrared receivers, the signal gain adjustment module adjusts the gain of the first frame of the received signal according to the initial gain adjustment signal, the control module obtains the signal strength value of the adjusted first frame of the received signal from the signal gain adjustment module, and if the difference between the signal strength value of the adjusted first frame of the received signal and the set target signal strength value is not within the preset difference range, the initial gain adjustment signal is increased or decreased, and the gain adjustment signal is re-determined; according to the re-determined gain adjustment signal, the second frame of the received signal of each infrared receiver in the first part of infrared receivers is adjusted. That is, in the process of working, the gain adjustment signal corresponding to the current frame is determined according to the signal strength value of the adjusted last frame of the received signal of each infrared receiver in the first part of infrared receivers, the current frame of the received signal of each infrared receiver in the first part of infrared receivers is adjusted according to the gain adjustment signal corresponding to the current frame, and if the difference between the signal strength value of the adjusted received signal and the set target signal strength value is within the preset difference range, the gain adjustment of the received signal is completed; if the difference between the signal strength value of the adjusted received signal and the set target signal strength value is not within the preset difference range, the corresponding gain adjustment signal is re-determined; the received signal of each infrared receiver in the first part of infrared receivers of the next frame is adjusted according to the re-determined gain adjustment signal, until the difference between the signal strength value of the adjusted received signal and the set target signal strength value is within the preset difference range.

[0061] In yet another embodiment, for some signal gain adjustment modules, the gain adjustment signal can be adjusted in real time, and the signal gain adjustment module can use the gain adjustment signal generated by the current frame for the adjustment of the current frame.

[0062] In one embodiment, the control module obtains the received signal corresponding to each infrared receiver in the first part of infrared receivers of the current frame; according to the difference between the signal strength value of the received signal of each infrared receiver in the first part of infrared receivers and the set target signal strength value, the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers is obtained, and then each first output end of the gain adjustment signal output module outputs the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers to the signal gain adjustment module, and the signal gain adjustment module adjusts the gain of the received signal obtained by each infrared receiver in the first part of infrared receivers of the current frame.

[0063] The target signal strength range can be a specific target strength value or a signal strength range.

[0064] The first time period is a time period within an infrared emitter off period. The infrared emitter off period is a time period from when the infrared emitter is turned off to when the infrared emitter is turned on.

[0065] S30: According to the received signal of each infrared receiver in the second part of infrared receivers, the gain adjustment signal output module is controlled to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in a second time period, for adjusting the received signal of each infrared receiver in the second part of infrared receivers, so that the intensity value of the adjusted received signal of each infrared receiver in the second part of infrared receivers is within the target signal intensity range. The first time period is a time period within an infrared emitter off period, and the second time period is later than the first time period.

[0066] In an embodiment, the corresponding gain adjustment signal for each infrared receiver in the second part of infrared receivers can be determined each time the initialization is started or the environment changes, and then directly called in the working process.

[0067] In an embodiment, the control module controls the infrared emitter to emit an infrared signal each time the initialization is started or the environment changes, and then the control module samples the received signal of the second part of infrared receivers multiple times to obtain multiple received signals of the second part of infrared receivers. For each infrared receiver in the second part of infrared receivers, the signal intensity values of the multiple received signals obtained by sampling are averaged to obtain the average signal intensity value of each infrared receiver in the second part of infrared receivers. According to the difference between the average signal intensity value of each infrared receiver in the second part of infrared receivers and the set target signal intensity value, the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers is obtained. In the subsequent gain adjustment process, each first output end of the gain adjustment signal output module outputs a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in a second time period, and the signal gain adjustment module adjusts the received signal of each infrared receiver in the second part of infrared receivers in real time according to the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers.

[0068] In another embodiment, at each time of booting initialization or when the environment changes, the control module determines the corresponding initial gain adjustment signal for the received signal of each infrared receiver in the second part of infrared receivers, and then the control module acquires the received signal of the second part of infrared receivers in the previous frame, and according to the received signal of the second part of infrared receivers and the initial gain adjustment signal, the control module controls the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively before acquiring the received signal of the current frame.

[0069] In one embodiment, at each time of booting initialization or when the environment changes, the control module controls the gain adjustment signal output module to output the initial gain adjustment signal to the signal gain adjustment module for the received signal of the first frame of each infrared receiver in the second part of infrared receivers, the signal gain adjustment module performs gain adjustment on the received signal of the first frame according to the initial gain adjustment signal, the control module acquires the signal strength value of the adjusted received signal of the first frame from the signal gain adjustment module, and if the difference between the signal strength value of the adjusted received signal of the first frame and the set target signal strength value is not within the preset difference range, the initial gain adjustment signal is increased or decreased, and the gain adjustment signal is re-determined; and according to the re-determined gain adjustment signal, the received signal of the second frame of each infrared receiver in the second part of infrared receivers is adjusted. That is, in the process of working, according to the signal strength value of the adjusted received signal of the previous frame of each infrared receiver in the second part of infrared receivers, the corresponding gain adjustment signal is determined, the received signal of the current frame of each infrared receiver in the second part of infrared receivers is adjusted according to the gain adjustment signal, if the difference between the signal strength value of the adjusted received signal and the set target signal strength value is within the preset difference range, the gain adjustment of the received signal is completed; if the difference between the signal strength value of the adjusted received signal and the set target signal strength value is not within the preset difference range, the corresponding gain adjustment signal is re-determined; and according to the re-determined gain adjustment signal, the received signal of each infrared receiver in the second part of infrared receivers in the next frame of the current frame is adjusted until the difference between the signal strength value of the adjusted received signal and the set target signal strength value is within the preset difference range.

[0070] In yet another embodiment, for some signal gain adjustment modules, the gain adjustment signal can be adjusted in real time, and the signal gain adjustment module can use the gain adjustment signal generated in the current frame for the adjustment of the current frame.

[0071] In one embodiment, the control module obtains a receiving signal corresponding to each infrared receiver in the second part of infrared receivers in the current frame; obtains a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers according to a difference between a signal strength value of the receiving signal of each infrared receiver in the second part of infrared receivers and a target signal strength value, and then controls each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers to the signal gain adjustment module, respectively, and the signal gain adjustment module adjusts the receiving signal obtained by each infrared receiver in the second part of infrared receivers in the current frame.

[0072] In an optional embodiment, the sum of the number of the first part of infrared receivers and the number of the second part of infrared receivers is equal to the number of all infrared receivers corresponding to the infrared emitter currently transmitting the infrared signal. The first part of infrared receivers can be one or more infrared receivers in all infrared receivers corresponding to the infrared emitter currently transmitting the infrared signal, and the second part of infrared receivers can be one or more infrared receivers in all infrared receivers corresponding to the infrared emitter currently transmitting the infrared signal.

[0073] In an optional embodiment, the first time period is a first preset time period within the infrared emitter off period, and the second time period is a second preset time period later than the first preset time period within the infrared emitter off period.

[0074] The infrared emitter on period is a time period from the infrared emitter being turned on to the infrared emitter being turned off. All gain adjustment signals need to be output to the signal gain adjustment module within the infrared emitter off period, and can be used to adjust the received infrared signal within the on period, that is, whether the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers is output by the first signal maintaining module within the second time period or the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers is output directly by the gain adjustment signal output module to the signal gain adjustment module within the second time period, the gain adjustment signal needs to be output within the on period to facilitate adjustment of the received infrared signal.

[0075] In another optional embodiment, the first time period is a first preset time period within the infrared emitter off period, and the second time period is a second preset time period later than the first preset time period, which spans the infrared emitter off period and the infrared emitter on period.

[0076] It should be understood that the gain adjustment signal only needs to be output before the infrared receiver receives the infrared signal. Since the infrared signal received by the infrared receiver is an analog signal, the infrared receiver may not receive the infrared signal at the first time of the light-on period. Before the infrared receiver receives the infrared signal, the gain adjustment signal output by the gain adjustment signal output module to each of the second part of the infrared receivers of the signal gain adjustment module is acceptable and does not need to be limited to output during the light-off period, but only needs to be output before the infrared signal is received.

[0077] In one embodiment, since the signal gain adjustment module needs a stable and continuous gain adjustment signal when it responds to the gain adjustment signal for gain adjustment, in the light-on period, the gain adjustment signal output by the gain adjustment signal output module to each of the second part of the infrared receivers of the signal gain adjustment module needs to be kept output until the signal gain adjustment module obtains the received signal of the infrared receiver, and the received signal of the corresponding infrared receiver is gain-adjusted by the gain adjustment signal kept output.

[0078] By controlling the gain adjustment signal output module to output the gain adjustment signal corresponding to each of the first part of the infrared receivers through the first signal keeping module in the first time period, and directly output the gain adjustment signal corresponding to each of the second part of the infrared receivers in the second time period, the received signal of each infrared receiver is gain-adjusted by the gain adjustment signal corresponding to each infrared receiver, so that the signal strength value of the received signal of each infrared receiver is in the target signal strength range, the signal strength difference between each gain-adjusted received signal is reduced, and the touch recognition accuracy is improved.

[0079] In one embodiment, step S20 includes step S201 as follows:

[0080] S201: According to the received signal of each infrared receiver in the first part of the infrared receivers, control the gain adjustment signal output module to output a plurality of first gain adjustment signals in the first time period, amplify the plurality of first gain adjustment signals through the signal amplification module, and output the gain adjustment signal corresponding to each of the first part of the infrared receivers, and keep outputting the gain adjustment signal corresponding to each infrared receiver through the first signal keeping module.

[0081] Step S30 includes step S301 as follows:

[0082] S301: According to the received signal of each infrared receiver in the second part of infrared receivers, control the gain adjustment signal output module to output a plurality of second gain adjustment signals in the second time period, amplify the plurality of second gain adjustment signals through the signal amplification module, and output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively.

[0083] Considering that the gain adjustment signal output module needs a certain response time to stably output a certain size of gain adjustment signal. The smaller the value of the gain adjustment signal output by the gain adjustment signal output module, the shorter the response time required, so only the gain adjustment signal output module needs to output a small value of the gain adjustment signal, and then amplify it through the signal amplification module, which can shorten the response time of the gain adjustment signal output module and improve the efficiency.

[0084] In an embodiment, the signal amplification module receives a plurality of first gain adjustment signals in the first time period, amplifies the plurality of first gain adjustment signals, and outputs the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers respectively. The control module controls the first signal retention module to output the gain adjustment signal corresponding to each infrared receiver to the signal gain adjustment module in the first time period, and retains the gain adjustment signal corresponding to each infrared receiver, and controls the first signal retention module to continuously output the retained gain adjustment signal corresponding to each infrared receiver to the signal gain adjustment module in the second time period and the light-on period.

[0085] The signal amplification module receives a plurality of second gain adjustment signals in the second time period, amplifies the plurality of second gain adjustment signals, and outputs the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively. The signal amplification module sends the gain adjustment signal corresponding to each infrared receiver to the signal gain adjustment module.

[0086] The embodiment of the present application can make the gain adjustment signal output module only need to output smaller first gain adjustment signal and second gain adjustment signal by setting the signal amplification module, improve the response speed of the gain adjustment signal output module, and shorten the time of infrared signal gain adjustment.

[0087] In an embodiment, step S30 includes step S31 as follows:

[0088] S31: According to the received signal of each infrared receiver in the second part of infrared receivers, control the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively in the second time period, and output the gain adjustment signal through the second signal holding module for holding, so as to adjust the received signal of each infrared receiver in the second part of infrared receivers, and make the intensity value of the adjusted received signal of each infrared receiver in the second part of infrared receivers in the target signal intensity range.

[0089] In the embodiment of the application, the control module obtains the received signal of each infrared receiver in the second part of infrared receivers, and controls the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively in the second time period according to the received signal of each infrared receiver in the second part of infrared receivers, and the gain adjustment signal is output to the signal gain adjustment module through the second signal holding module for holding.

[0090] It should be understood that the signal gain adjustment module in the embodiment of the application is a voltage-controlled adjustment circuit, and the voltage-controlled adjustment circuit needs to have a voltage signal input and be a stable voltage signal to trigger adjustment. The input of the stable voltage signal needs a certain time. Therefore, when the gain adjustment signal output module outputs the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively in the signal gain adjustment module at each first output end, the second signal holding module also holds the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers. When the gain adjustment signal output module stops outputting the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively, the second signal holding module continues to output the held gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers to the signal gain adjustment module, so that the signal gain adjustment module can continuously obtain the signal gain adjustment signal to adjust the received signal of each infrared receiver in the second part of infrared receivers.

[0091] The second signal holding module can make the signal gain adjustment module continuously obtain the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers respectively, so as to adjust the received signal of each infrared receiver in the second part of infrared receivers.

[0092] In one embodiment, step S20 includes step S21 as follows:

[0093] S21: According to the received signal of each infrared receiver in the first part of infrared receivers of the previous frame, control the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers of the current frame respectively in the first time period of the previous frame.

[0094] In the embodiment of the present application, for the case of adjusting the gain adjustment signal in real time, since the generation and transmission of the gain adjustment signal need time, and the signal gain adjustment module for adjusting the gain of the received signal is usually a voltage-controlled adjustment circuit, the voltage-controlled adjustment circuit needs to have a voltage signal input and be a stable voltage signal to trigger the adjustment, and the input of the stable voltage signal also needs a certain time, therefore, when the signal gain adjustment module obtains the received signal of the infrared receiver, the signal gain adjustment module may not have received the stable gain adjustment signal, for this reason, in order to realize the accurate gain adjustment of the received signal as much as possible and realize the real-time adjustment of the gain adjustment of the received signal as much as possible, the gain adjustment signal generated in the last frame can be used for the adjustment of the current frame.

[0095] In one embodiment, the control module can obtain the received signal of the first part of infrared receivers in the last frame, and according to the received signal of the first part of infrared receivers, control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers respectively before obtaining the received signal of the current frame, and the output is maintained by the first signal maintaining module and output to the signal gain adjustment module, so that the signal gain adjustment module adjusts the gain adjustment signal of the current frame according to the received infrared signal of the last frame, and the adjustment accuracy is higher.

[0096] It should be understood that the signal gain adjustment module in the embodiment of the present application is a voltage-controlled adjustment circuit, the voltage-controlled adjustment circuit needs to have a voltage signal input and be a stable voltage signal to trigger the adjustment, and the input of the stable voltage signal needs a certain time, for this reason, when each first output end of the gain adjustment signal output module outputs the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers to the signal gain adjustment module, the first signal maintaining module also maintains the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers, when the gain adjustment signal output module stops outputting the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers, the first signal maintaining module continues to output the maintained gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers to the signal gain adjustment module, so that the signal gain adjustment module can continuously obtain the signal gain adjustment signal, and the received signal obtained by each infrared receiver is adjusted in gain respectively, so that the signal strength value of the received signal of each infrared receiver is in the target signal strength range.

[0097] Step S30 includes the following step S31:

[0098] S31: According to the received signal of each infrared receiver in the second part of the infrared receiver of the last frame, the gain adjustment signal output module is controlled to output the gain adjustment signal corresponding to each infrared receiver in the second part of the infrared receiver of the current frame in the second time period of the last frame.

[0099] In an embodiment, the control module can obtain the received signal of the second part of the infrared receiver in the last frame, and according to the received signal of the second part of the infrared receiver, control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of the infrared receiver to the signal gain adjustment module before obtaining the received signal of the current frame, so that the signal gain adjustment module adjusts the gain adjustment signal of the current frame according to the received infrared signal of the last frame, and the adjustment accuracy is higher.

[0100] It should be understood that the signal gain adjustment module in the embodiment of the present application is a voltage-controlled adjustment circuit, which needs a voltage signal to be accessed and a stable voltage signal to trigger adjustment. The access of the stable voltage signal requires a certain time. Therefore, each first output end of the gain adjustment signal output module outputs the gain adjustment signal corresponding to each infrared receiver in the second part of the infrared receiver to the signal gain adjustment module, so that the signal gain adjustment module can continuously obtain the gain adjustment signal, and the received signal obtained by each infrared receiver is respectively adjusted in gain, so that the signal strength value of the received signal of each infrared receiver is in the target signal strength range.

[0101] In an embodiment, the infrared signal gain adjustment method further comprises: the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receiver and the gain adjustment signal corresponding to each infrared receiver in the second part of the infrared receiver are used to adjust the received signal corresponding to the respective infrared receiver at the same time, so that the intensity value of the adjusted received signal is in the target signal strength range.

[0102] In the embodiment of the present application, during the light-on period of the infrared emitter, the signal gain adjustment module obtains the received signal of the infrared receiver corresponding to the infrared emitter, and according to the gain adjustment signal corresponding to each infrared receiver in the first part of the infrared receiver and the gain adjustment signal corresponding to each infrared receiver in the second part of the infrared receiver, the received signal corresponding to the respective infrared receiver is simultaneously adjusted in gain, so that the intensity value of the adjusted received signal corresponding to the respective infrared receiver is simultaneously in the target signal strength range, which meets the simultaneity and consistency of the received signal adjustment.

[0103] In one embodiment, the infrared signal gain adjustment method further comprises: the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers is kept output by the first signal keeping module during the infrared emitter light-on period; and the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers is kept output.

[0104] In the embodiments of the present application, since the signal gain adjustment module needs stable and continuous gain adjustment signals when it performs gain adjustment in response to the gain adjustment signals, the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers kept output by the first signal keeping module and the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers directly output to the signal gain adjustment module by the gain adjustment signal output module need to be kept output until the signal gain adjustment module obtains the received signals of the infrared receivers and performs gain adjustment on the received signals of the corresponding infrared receivers by using the kept gain adjustment signals.

[0105] The following describes the scheme of the present application by taking an infrared emitter emitting infrared signals, eight infrared receivers obtaining the infrared signals to obtain eight received signals, and the gain adjustment signal output module having four signal output ends to output gain adjustment signals, and taking the gain adjustment signals determined by the received signals obtained by the infrared receivers in the previous frame to perform gain adjustment on the received signals obtained by the infrared receivers in the current frame as an example.

[0106] If the time period from the infrared emitter being turned on in the previous frame to the infrared emitter being turned off is the light-on period T0'-T0 of the infrared emitter in the previous frame, the time period from the infrared emitter being turned off in the previous frame to the infrared emitter being turned on in the current frame is the light-off period T0-T2 of the infrared emitter in the previous frame, and the time period from the infrared emitter being turned on in the current frame to the infrared emitter being turned off is the light-on period T2-T3 of the infrared emitter in the current frame, the light-off period T0-T2 of the infrared emitter in the previous frame is divided into a first time period T0-T1 and a second time period T1-T2.

[0107] The control module controls the infrared receivers 1'-8' to receive infrared signals in the light-on period T0'-T0 of the previous frame infrared emitter, and controls the control module to obtain the receiving signals a, b, c, d, e, f, g, h obtained by the infrared receivers 1'-8' in the light-on period T0'-T0 of the previous frame infrared emitter. The control module obtains the gain adjustment signals corresponding to the infrared receivers 1'-8' according to the signal strength of the receiving signals of the infrared receivers 1'-8' in the previous frame, and uses the gain adjustment signals to adjust the gain of the receiving signals of the infrared receivers 1'-8' in the current frame. The control gain adjustment signal output module sends the gain adjustment signals A, B, C, D corresponding to the infrared receivers 1'-4' in the current frame to the first signal holding module through four signal output ends, the first signal holding module outputs the gain adjustment signals A, B, C, D to the signal gain adjustment module, and the first signal holding module holds the gain adjustment signals A, B, C, D. When the four signal output ends of the control gain adjustment signal output module no longer output the gain adjustment signals A, B, C, D, the first signal holding module continuously outputs the held gain adjustment signals A, B, C, D to the signal gain adjustment module, so that the signal gain adjustment module continuously obtains the gain adjustment signals A, B, C, D in the current frame light-on period T2-T3.

[0108] In the second half T1-T2 period of the previous frame infrared emitter, the gain adjustment signal output module continuously outputs the gain adjustment signals E, F, G, H corresponding to the infrared receivers 5'-8' in the current frame to the signal gain adjustment module through four signal output ends, and the signal gain adjustment module continuously obtains the gain adjustment signals E, F, G, H in the current frame light-on period T2-T3.

[0109] The control module controls the infrared receivers 1'-8' to emit infrared signals in the light-on period T2-T3 of the current frame infrared emitter, and the signal gain adjustment module obtains the receiving signals a', b', c', d', e', f', g', h' obtained by the infrared receivers 1'-8' in the light-on period T2-T3 of the current frame infrared emitter. The signal gain adjustment module adjusts the receiving signals a', b', c', d', e', f', g', h' according to the gain adjustment signals A, B, C, D, E, F, G, H respectively, so that the signal strength value of the adjusted receiving signals is in the target signal strength range.

[0110] Please refer to Fig. 4, which is a structural schematic diagram of an infrared signal gain adjustment circuit according to an embodiment of the present application. The infrared signal gain adjustment circuit according to the embodiment of the present application is applied to signal gain adjustment of an infrared touch frame, and is used to reduce the signal intensity difference between the received signals obtained by each infrared receiver on the infrared touch frame. The infrared signal gain adjustment circuit according to the embodiment of the present application comprises a control module 10, at least two infrared receivers 11, a gain adjustment signal output module 12, a first signal holding module 13, and a signal gain adjustment module 14.

[0111] The control module 10 comprises a first signal output end; the gain adjustment signal output module 12 comprises a first input end and a plurality of first output ends; the first signal holding module 13 comprises a plurality of second input ends and a plurality of second output ends; and the signal gain adjustment module 14 comprises a plurality of second signal input ends, a plurality of third signal input ends, and a plurality of fourth signal input ends.

[0112] The control module is used to obtain the received signals of the at least two infrared receivers 11 in the previous frame; the first signal output end of the control module 10 is connected with the first input end of the gain adjustment signal output module 12; each first output end of the gain adjustment signal output module 12 is respectively connected with one second input end of the first signal holding module 13; one second output end of the first signal holding module 13 is connected with one second signal input end of the signal gain adjustment module 14; and the control module 10 is used to control each first output end of the gain adjustment signal output module 12 to output the gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 in the previous frame in the first time period of the previous frame, and the output is held by the first signal holding module 13 and output to the signal gain adjustment module 14 according to the received signals of the first part of infrared receivers 11 in the previous frame.

[0113] Each first output end of the gain adjustment signal output module 12 is also respectively connected with one third signal input end of the signal gain adjustment module 14; and the control module 10 is used to control each first output end of the gain adjustment signal output module 12 to output the gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 in the previous frame to the signal gain adjustment module 14 in the second time period of the previous frame according to the received signals of the second part of infrared receivers 11 in the previous frame.

[0114] Each fourth signal input end of the signal gain adjustment module 14 is connected with the at least two infrared receivers 11, and is used to respectively adopt the gain adjustment signal corresponding to each infrared receiver 11 in the current frame determined in the light-off period of the previous frame to perform gain adjustment on the received signal obtained by each infrared receiver 11 in the current frame, so that the signal intensity value of the received signal of each infrared receiver 11 in the current frame is in the target signal intensity range.

[0115] The control module 10 can be a microcontroller unit (MCU), a logic control circuit, or a control chip.

[0116] The gain adjustment signal output module 12 can be a digital to analog converter (DAC) independent of the control module 10, a digital to analog converter integrated in the control module 10, or a signal source controlled by software to output different analog signals.

[0117] Each first output end of the gain adjustment signal output module 12 can output different gain adjustment signals in different time periods. For example, two different gain adjustment signals are output in two different time periods. Each first output end of the gain adjustment signal output module 12 can output one gain adjustment signal to the signal gain adjustment module 14 via the first signal holding module 13 in one time period, and output another gain adjustment signal to the signal gain adjustment module 14 in another time period. In the embodiment of the present application, the gain adjustment signal is an analog voltage signal.

[0118] The first signal holding module 13 can be an integrated chip or a logic circuit. After each infrared receiver 11 of the first part of infrared receivers 11 outputs the corresponding gain adjustment signal of each infrared receiver 11 from each first output end of the gain adjustment signal output module 12, the first signal holding module 13 continues to output the corresponding gain adjustment signal of each infrared receiver 11 of the first part of infrared receivers 11 to the signal gain adjustment module 14.

[0119] It should be understood that the signal gain adjusting module 14 in the embodiments of the present application is a voltage-controlled adjusting circuit, which needs a voltage signal to be connected and the voltage signal is stable so as to trigger the adjusting. The connection of the stable voltage signal needs a certain time. Therefore, when the gain adjusting signal output module 12 outputs the gain adjusting signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 to the signal gain adjusting module 14, the first signal maintaining module 13 also maintains the gain adjusting signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11. When the gain adjusting signal output module 12 stops outputting the gain adjusting signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11, the first signal maintaining module 13 continues to output the maintained gain adjusting signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 to the signal gain adjusting module 14, so that the signal gain adjusting module 14 can continuously obtain the signal gain adjusting signal to adjust the received signal of the infrared receiver 11.

[0120] The signal gain adjusting module 14 can be a logic circuit. In an embodiment, the signal gain adjusting module 14 is an automatic gain control (AGC) circuit. The signal gain adjusting module 14 receives the gain adjusting signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 through the first signal input end and receives the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 through the third signal input end, and then adjusts the received signal of each infrared receiver 11 to make the signal intensity value of the received signal of each infrared receiver 11 in the target signal intensity range.

[0121] The principles of the control module 10, the gain adjusting signal output module 12, the first signal maintaining module 13 and the signal gain adjusting module 14 in the infrared signal gain adjusting circuit of the present application can refer to the foregoing method embodiments, which will not be described here.

[0122] In the embodiment of the present application, the control module is a control chip, and the gain adjustment signal output module is a DAC module in the control chip. The control module 10 controls each first output end of the gain adjustment signal output module 12 to output a gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 in the previous frame in a first time period of the previous frame according to the received signal of each infrared receiver 11 in the first part of infrared receivers 11 in the previous frame, and the gain adjustment signal is output to the signal gain adjustment module 14 through the first signal holding module 13 for holding; and controls each first output end of the gain adjustment signal output module 12 to output a gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 in the previous frame in a second time period of the previous frame according to the received signal of each infrared receiver 11 in the second part of infrared receivers 11 in the previous frame, and the gain adjustment signal is output to the signal gain adjustment module 14, so that the signal gain adjustment module 14 uses the gain adjustment signal corresponding to each infrared receiver 11 in the current frame determined in the off period of the previous frame to perform gain adjustment on the received signal of each infrared receiver 11 in the current frame, so that the signal strength value of the received signal of each infrared receiver 11 in the current frame is in the target signal strength range, the signal strength difference between each received signal in the current frame after gain adjustment is reduced, and the touch recognition accuracy is improved.

[0123] In one of the embodiments, the control module 10 further includes a plurality of first signal input ends, the signal gain adjustment module 14 further includes a plurality of second signal output ends, and each first signal input end of the control module 10 corresponds to each second signal output end of the signal gain adjustment module 14 in one-to-one correspondence. The control module 10 is configured to acquire the signal strength value of the received signal of at least two infrared receivers 11 in the previous frame after adjustment from the signal gain adjustment module 14, and determine the gain adjustment signal of the received signal of at least two infrared receivers 11 in the current frame according to the signal strength value of the received signal of at least two infrared receivers 11 in the previous frame after adjustment.

[0124] In one of the embodiments, if the difference between the signal strength value of the received signal of at least two infrared receivers 11 in the previous frame after adjustment and the set target signal strength value is not within the preset difference range, the gain adjustment signal of the received signal of at least two infrared receivers 11 in the current frame is obtained by increasing or decreasing on the basis of the gain adjustment signal of the received signal of at least two infrared receivers 11 in the previous frame.

[0125] The first output end of the gain adjustment signal output module 12 outputs the gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 in the first time period of the last frame, and the output is kept by the first signal keeping module 13 in the light-on period of the current frame and output to the signal gain adjustment module 14; and the first output end of the gain adjustment signal output module 12 outputs the gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 in the second time period of the last frame to the signal gain adjustment module 14, so that the signal gain adjustment module 14 uses the gain adjustment signal corresponding to each infrared receiver 11 in the current frame determined in the last frame to adjust the received signal of each infrared receiver 11 in the current frame, so that the signal strength value of the received signal of each infrared receiver 11 in the current frame is in the target signal strength range, the signal strength difference between each received signal in the current frame after gain adjustment is reduced, and the touch recognition accuracy is improved.

[0126] In one embodiment, referring to FIG. 5, the control module 10 further includes a first control output end; and the first signal keeping module 13 further includes a controlled end; the first control output end of the control module 10 is connected with the controlled end of the first signal keeping module 13.

[0127] In the embodiment, the first control output end of the control module 10 is at high level in the first time period, the controlled end of the first signal keeping module 13 is at high level, the first signal keeping module is turned on, so that the gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 output by the gain adjustment signal output module 12 is transmitted to the signal gain adjustment module 14 via the first signal keeping module 13, and the first signal keeping module 13 keeps the gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11.

[0128] The first control output end of the control module 10 is at low level in the second time period, the controlled end of the first signal keeping module 13 is at low level, the first signal keeping module is turned off, so that the first signal keeping module 13 continuously outputs the gain adjustment signal corresponding to each infrared receiver 11 in the first part of infrared receivers 11 kept by the first signal keeping module 13 to the signal gain adjustment module 14.

[0129] Optionally, according to the circuit structure of the first signal keeping module, when the controlled end of the first signal keeping module is at low level, the first signal keeping module is turned on, and when the controlled end of the first signal keeping module is at high level, the first signal keeping module is turned off.

[0130] The first signal holding module 13 is controlled by the control module 10 to hold and continuously output the signals, so that the signal gain adjusting module 14 can continuously obtain the gain adjusting signals corresponding to each infrared receiver 11 in the first part of infrared receivers 11.

[0131] In one embodiment, referring to FIG. 6, the first signal holding module 13 includes a plurality of first signal holding sub-modules 130; the controlled ends of the first signal holding module 13 include the controlled ends of the first signal holding sub-modules 130; the second input ends of the first signal holding module 13 are the input ends of the first signal holding sub-modules 130; and the second output ends of the first signal holding module 13 are the output ends of the first signal holding sub-modules 130.

[0132] In one embodiment, the input ends of each first signal holding sub-module 130 are connected with a first output end of the gain adjusting signal output module 12, the controlled ends of each first signal holding sub-module 130 are connected with a first control output end of the control module 10, and the output ends of each first signal holding sub-module 130 are connected with a second signal input end of the signal gain adjusting module 14.

[0133] In one embodiment, the first control output end of the control module 10 is at high level in the first time period, the controlled ends of the first signal holding sub-modules 130 are at high level, the first signal holding sub-modules 130 are turned on, so that each first output end of the gain adjusting signal output module 12 outputs the gain adjusting signals corresponding to each infrared receiver 11 in the first part of infrared receivers 11, the gain adjusting signals are transmitted to the signal gain adjusting module 14 via the corresponding first signal holding sub-modules 130, and the first signal holding sub-modules 130 hold the corresponding gain adjusting signals.

[0134] In one embodiment, the first control output end of the control module 10 is at low level in the second time period, the controlled ends of the first signal holding sub-modules 130 are at low level, the first signal holding sub-modules 130 are turned off, so that the first signal holding sub-modules 130 continuously output the held gain adjusting signals to the signal gain adjusting module 14.

[0135] Optionally, according to the circuit structure of the first signal holding sub-module, when the controlled end of the first signal holding sub-module is at low level, the first signal holding sub-module is turned on, and when the controlled end of the first signal holding sub-module is at high level, the first signal holding sub-module is turned off.

[0136] The first signal holding module 13 is controlled by the control module 10 to hold and continuously output the signals, so that the signal gain adjusting module 14 can continuously obtain the gain adjusting signals corresponding to each infrared receiver 11 in the first part of infrared receivers 11.

[0137] In one embodiment, referring to FIG. 6, the first signal holding submodule 130 comprises a first switch element K1 and a first holding capacitor C1.

[0138] The input end of the first switch element K1 is the input end of the first signal holding submodule 130; the output end of the first switch element K1 is the output end of the first signal holding submodule 130; the driving end of the first switch element K1 is the controlled end of the first signal holding submodule 130; one end of the first holding capacitor C1 is connected with the output end of the first switch element K1, and the other end of the first holding capacitor C1 is connected with the ground end.

[0139] The first switch element K1 comprises but is not limited to an analog switch and a digital switch.

[0140] The first holding capacitor C1 comprises but is not limited to a fixed capacitor and a variable capacitor.

[0141] In the embodiments of the present application, when the circuit is in the sampling state, the driving end of the first switch element K1 is high level, so that the first switch element K1 is turned on, and the first holding capacitor C1 is charged; when the circuit is in the holding state, the driving end of the first switch element K1 is low level, so that the first switch element K1 is turned off, and the first gain adjustment signal is kept as the signal level value at the instant of turning off.

[0142] Through the first switch element K1 and the first holding capacitor C1, the first gain adjustment signal can be kept for a certain period of time.

[0143] In one embodiment, referring to FIG. 7, the circuit further comprises a signal amplification module 15.

[0144] Each first output end of the gain adjustment signal output module 12 is connected with one second input end of the first signal holding submodule 13 via the signal amplification module, and each first output end of the gain adjustment signal output module 12 is also connected with one third signal input end of the signal gain adjustment module 14 via the signal amplification module.

[0145] The signal amplification module 15 is used for amplifying the gain adjustment signal output by each output end of the gain adjustment signal output module 12.

[0146] In the embodiment of the present application, it is considered that the gain adjustment signal output module 12 needs a certain response time to stably output a gain adjustment signal of a certain size. The smaller the value of the gain adjustment signal output by the gain adjustment signal output module 12, the shorter the response time required. Therefore, a signal amplification module 15 is arranged between each first output end of the gain adjustment signal output module 12 and a second input end of the first signal holding module 13, and between each first output end of the gain adjustment signal output module 12 and a third signal input end of the signal gain adjustment module 14. Each output end of the gain adjustment signal output module 12 only needs to output a gain adjustment signal of a small value, which is then amplified by the signal amplification module 15, so as to reduce the response time of the gain adjustment signal output module 12. For example, the gain adjustment signal output module 12 outputs an analog signal of 3.3v, and the response time required is 2us. If the signal amplification module 15 amplifies the analog signal by 2 times, the gain adjustment signal output module 12 only needs to output 1.65v, and after being amplified by the signal amplification module 15, the analog signal of 3.3v can be obtained, and the response time required is 1us.

[0147] In one embodiment, referring to FIG. 6, the signal amplification module 15 includes a plurality of signal amplification sub-modules 150. Each first output end of the gain adjustment signal output module 12 is connected to a second input end of the first signal holding module 13 via a signal amplification sub-module 150, and each first output end of the gain adjustment signal output module 12 is connected to a third signal input end of the signal gain adjustment module 14 via a signal amplification sub-module 150.

[0148] Among them, a signal amplification sub-module 150 is used to amplify the gain adjustment signal output by the corresponding output end of the gain adjustment signal output module 12.

[0149] Among them, when the first signal holding module 13 includes a plurality of first signal holding sub-modules 130, each output end of the gain adjustment signal output module 12 is connected to an input end of a first signal holding sub-module 130 via a signal amplification sub-module 150, and the output end of each first signal holding sub-module 130 is connected to a first signal input end of the signal gain adjustment module 14.

[0150] In the embodiment of the present application, it is considered that a certain response time is needed for each first output end of the gain adjustment signal output module 12 to stably output a gain adjustment signal of a certain size. The smaller the value of the analog signal output by each first output end of the gain adjustment signal output module 12, the shorter the response time needed. Therefore, a signal amplification submodule 150 is arranged between each first output end of the gain adjustment signal output module 12 and a second input end of the first signal holding module 13, or between each first output end of the gain adjustment signal output module 12 and a third signal input end of the signal gain adjustment module 14, so that each first output end of the gain adjustment signal output module 12 only needs to output a gain adjustment signal of a smaller value, and the signal is amplified by the signal amplification submodule 150, thereby reducing the response time of the gain adjustment signal output module 12. For example, the gain adjustment signal output module 12 outputs an analog signal of 3.3v, and the response time needed is 2us. If the signal amplification submodule 150 amplifies the analog signal by 2 times, then the gain adjustment signal output module 12 only needs to output 1.65v, and after being amplified by the signal amplification submodule 150, an analog signal of 3.3v can be obtained, and the response time needed is 1us.

[0151] In one embodiment, referring to FIG. 6, the signal amplification submodule 150 includes an operational amplifier A1, a first resistor R1, a second resistor R2, a third resistor R3, and a filter capacitor C2.

[0152] The non-inverting input end of the operational amplifier A1 is connected to the output end of the gain adjustment signal output submodule 120 through the first resistor R1; the inverting input end of the operational amplifier A1 is connected to the ground end through the second resistor R2, the inverting input end of the operational amplifier A1 is connected to the output end of the operational amplifier A1 through the third resistor R3, and the inverting input end of the operational amplifier A1 is connected to the output end of the operational amplifier A1 through the filter capacitor C2; the output end of the operational amplifier A1 is connected to an input end of the first signal holding module 13 and a third signal input end of the signal gain adjustment module 14; the positive power supply end of the operational amplifier A1 is connected to a direct current power supply, and the negative power supply end of the operational amplifier A1 is grounded.

[0153] In the embodiment of the present application, the third resistor R3 is connected in parallel with the filter capacitor C2 to form a low-pass filter for suppressing circuit noise. The resistance value of the third resistor R3 and the second resistor R2 determines the amplification factor of the operational amplifier A1. In one embodiment, the input voltage at the inverting input terminal of the operational amplifier A1 is compared with the input voltage at the non-inverting input terminal of the operational amplifier A1, and the output terminal of the operational amplifier A1 outputs the amplified gain adjustment signal to one input terminal of the first signal holding module 13 and one third signal input terminal of the signal gain adjustment module 14.

[0154] The gain adjustment signal output by the gain adjustment signal output sub-module 120 is amplified by a certain factor through the operational amplifier A1, the first resistor R1, the second resistor R2, the third resistor R3 and the filter capacitor C2, thereby reducing the response time of the gain adjustment signal output sub-module 120.

[0155] In one embodiment, referring to FIG. 8, a second signal holding module is arranged in the circuit path connecting each first output terminal of the gain adjustment signal output module 12 and one third signal input terminal of the signal gain adjustment module 14; the second signal holding module includes a plurality of input terminals and a plurality of output terminals.

[0156] Each first output terminal of the gain adjustment signal output module 12 is connected to one input terminal of the second signal holding module; one output terminal of the second signal holding module is connected to one third signal input terminal of the signal gain adjustment module 14.

[0157] The control module 10 controls each first output terminal of the gain adjustment signal output module 12 to output the gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 in the second time period according to the received signal of the second part of infrared receivers 11, and the gain adjustment signal is output to the signal gain adjustment module 14 through the second signal holding module.

[0158] The second signal holding module can be an integrated chip or a logic circuit. After each output terminal of the gain adjustment signal output module 12 outputs the gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11, the second signal holding module continues to output the held gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 to the signal gain adjustment module 14.

[0159] It should be understood that the signal gain adjusting module 14 in the embodiment of the present application is a voltage-controlled adjusting circuit, which needs a voltage signal to be connected and the voltage signal is stable so as to trigger the adjusting. The connection of the stable voltage signal needs a certain time. Therefore, when the gain adjusting signal output module 12 outputs the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 to the signal gain adjusting module 14, the second signal holding module also holds the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11. When the gain adjusting signal output module 12 stops outputting the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11, the second signal holding module 13 continues to output the held gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 to the signal gain adjusting module 14, so that the signal gain adjusting module 14 can continuously obtain the signal gain adjusting signal to adjust the received signal of the infrared receiver 11.

[0160] In one embodiment, the control module 10 further comprises a second control output end; and the second signal holding module further comprises a controlled end.

[0161] The second control output end of the control module 10 is connected with the controlled end of the second signal holding module.

[0162] In the embodiment of the present application, the control module 10 sends a third control signal to the controlled end of the second signal holding module through the second control output end; the second signal holding module transmits the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 to the signal gain adjusting module 14 according to the third control signal, and controls the second signal holding module to hold the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11; the control module 10 sends a fourth control signal to the controlled end of the first signal holding module 13 through the second control output end, and the second signal holding module transmits the held gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11 to the signal gain adjusting module 14 according to the fourth control signal.

[0163] The control module 10 sends the control signal to control the second signal holding module to hold and send, so that the signal gain adjusting module 14 can continuously obtain the gain adjusting signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11.

[0164] In an alternative embodiment, the second signal holding module comprises a plurality of second signal holding sub-modules; the controlled end of the second signal holding module comprises the controlled end of each second signal holding sub-module; each input end of the second signal holding module is an input end of each second signal holding sub-module; and each output end of the second signal holding module is an output end of each second signal holding sub-module.

[0165] In an embodiment, each first output end of the gain adjustment signal output module 12 is connected to an input end of a second signal holding sub-module; the controlled end of each second signal holding sub-module is connected to a second control output end of the control module 10; and the output end of each second signal holding sub-module is connected to a third signal input end of the signal gain adjustment module 14.

[0166] Wherein, when each second signal holding sub-module receives a third control signal sent by the control module 10 through the second control output end, each first output end of the gain adjustment signal output module 12 outputs a gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11, and each second signal holding sub-module performs signal holding on the corresponding gain adjustment signal via the corresponding second signal holding sub-module to the signal gain adjustment module 14; and when each second signal holding sub-module receives a fourth control signal sent by the control module 10 through the first control output end, each second signal holding sub-module continuously outputs the held gain adjustment signal to the signal gain adjustment module 14.

[0167] By sending control signals by the control module 10 to control each second signal holding sub-module to hold and send, the signal gain adjustment module 14 can continuously obtain the gain adjustment signal corresponding to each infrared receiver 11 in the second part of infrared receivers 11.

[0168] It can be understood that the structure and control principle of the second signal holding sub-module are completely different from those of the first signal holding sub-module 130, which will not be described here.

[0169] It can be understood that, according to actual needs, more small time periods can be divided in the first time period and the second time period respectively, and more signal holding modules can be set, so that one output end of the gain adjustment signal output module 12 sends different gain adjustment signals in more different time periods, and gain adjustment of the received signals in more infrared receivers 11 is realized, which will not be described here.

[0170] In one embodiment, referring to FIG. 9, the application further provides an infrared touch frame 10, which comprises a frame body, a plurality of infrared emitters 110 and the signal gain control circuit 200 described above; the plurality of infrared emitters 110 and the plurality of infrared receivers 11 in the signal gain control circuit 200 are arranged at the side edges of the frame body respectively; and at least two fourth signal input ends of the signal gain adjustment module 14 are connected with at least two infrared receivers respectively.

[0171] In the embodiment of the application, each infrared emitter 110 emits an infrared signal, and the corresponding plurality of infrared receivers 11 receive the infrared signal. Since the angle and distance between each infrared receiver 11 and the same infrared emitter 110 are different, when receiving the infrared signal emitted by the same infrared emitter 110, the received signals of the infrared receivers 11 will have signal strength difference. The signal gain adjustment module 14 can adjust the gain of the received signal of each infrared receiver 11 according to the gain adjustment signal corresponding to the received signal, so that the signal strength of the received signal of each adjusted infrared receiver 11 is basically consistent.

[0172] In one embodiment, referring to FIG. 10, the application further provides an infrared touch device, which comprises a display screen 100 and the infrared touch frame 10 described above, and the infrared touch frame 10 is arranged around the periphery of the display screen 100.

[0173] Specifically, the infrared touch device can be a smart blackboard and an interactive tablet.

[0174] In the embodiment of the application, the structure of the infrared touch frame 10 is the same as that described above, which will not be described here. By applying the signal gain control circuit described above to the infrared touch screen, the touch accuracy of the infrared touch screen can be improved due to the reduction of the signal strength difference between the infrared signals.

[0175] It should be further understood that the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices that comprise a series of elements include not only those elements, but also other elements not explicitly listed, or other elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article, or device that includes the element.

[0176] The above is only an embodiment of the application and is not intended to limit the application. The application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the scope of the claims of the application.

Claims

1. A method of infrared signal gain adjustment, wherein, The method comprises the following steps: controlling an infrared emitter to emit an infrared signal, and at least two infrared receivers to receive the infrared signal to obtain corresponding received signals; controlling a gain adjustment signal output module to output, in a first time period, gain adjustment signals corresponding to each of the first part of infrared receivers, respectively, according to the received signals of each of the first part of infrared receivers, and outputting the gain adjustment signals through a first signal holding module for holding output, so as to adjust the received signals of each of the first part of infrared receivers, and make the intensity values of the adjusted received signals of each of the first part of infrared receivers in a target signal intensity range; controlling the gain adjustment signal output module to output, in a second time period, gain adjustment signals corresponding to each of the second part of infrared receivers, respectively, according to the received signals of each of the second part of infrared receivers, for adjusting the received signals of each of the second part of infrared receivers, and making the intensity values of the adjusted received signals of each of the second part of infrared receivers in the target signal intensity range; wherein the first time period is a time period in the off period of the infrared emitter, and the second time period is later than the first time period.

2. The infrared signal gain adjustment method according to claim 1, wherein: the first time period is a first preset time period in the off period of the infrared emitter, and the second time period is a second preset time period later than the first preset time period in the off period of the infrared emitter; or, the first time period is a first preset time period in the off period of the infrared emitter, and the second time period is a second preset time period later than the first preset time period and spanning the off period and the on period of the infrared emitter.

3. The infrared signal gain adjustment method according to claim 1, wherein: the step of controlling the gain adjustment signal output module to output, in a first time period, gain adjustment signals corresponding to each of the first part of infrared receivers, respectively, according to the received signals of each of the first part of infrared receivers, and outputting the gain adjustment signals through a first signal holding module for holding output, comprises: controlling the gain adjustment signal output module to output, in a first time period, a plurality of first gain adjustment signals according to the received signals of each of the first part of infrared receivers, amplifying the plurality of first gain adjustment signals through a signal amplification module, outputting gain adjustment signals corresponding to each of the first part of infrared receivers, respectively, and outputting the gain adjustment signals corresponding to each of the infrared receivers through the first signal holding module for holding output; the step of controlling the gain adjustment signal output module to output, in a second time period, gain adjustment signals corresponding to each of the second part of infrared receivers, respectively, according to the received signals of each of the second part of infrared receivers, comprises: According to the receiving signal of each infrared receiver in the second part of infrared receivers, the gain adjustment signal output module is controlled to output a plurality of second gain adjustment signals in a second time period, and the plurality of second gain adjustment signals are amplified by the signal amplification module to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers.

4. The infrared signal gain adjustment method of claim 1, wherein: The step of controlling the gain adjustment signal output module to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers according to the receiving signal of each infrared receiver in the second part of infrared receivers in a second time period comprises: According to the receiving signal of each infrared receiver in the second part of infrared receivers, the gain adjustment signal output module is controlled to output a plurality of second gain adjustment signals in a second time period, and the plurality of second gain adjustment signals are amplified by the signal amplification module to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers.

5. The infrared signal gain adjustment method of claim 1, wherein: The step of controlling the gain adjustment signal output module to output a gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers according to the receiving signal of each infrared receiver in the first part of infrared receivers in a first time period comprises: According to the receiving signal of each infrared receiver in the first part of infrared receivers in the previous frame, the gain adjustment signal output module is controlled to output a gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers in the current frame in the first time period of the previous frame; The step of controlling the gain adjustment signal output module to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers according to the receiving signal of each infrared receiver in the second part of infrared receivers in a second time period comprises: According to the receiving signal of each infrared receiver in the second part of infrared receivers in the previous frame, the gain adjustment signal output module is controlled to output a gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in the current frame in the second time period of the previous frame.

6. The method of infrared signal gain adjustment according to claim 1, wherein, Further comprising: The gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers and the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers simultaneously adjust the receiving signal corresponding to the respective infrared receiver, so that the intensity value of the adjusted receiving signal is in the target signal intensity range.

7. The method of infrared signal gain adjustment according to claim 1, wherein, Further comprising: The gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers is output through the first signal holding module in the infrared emitter light-on period; The gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers is kept outputted in the infrared emitter light-on period.

8. An infrared signal gain adjustment circuit, comprising: The infrared signal gain adjustment circuit comprises a control module, at least two infrared receivers, a gain adjustment signal output module, a first signal keeping module and a signal gain adjustment module. The control module comprises a first signal output end; the gain adjustment signal output module comprises a first input end and a plurality of first output ends; the first signal keeping module comprises a plurality of second input ends and a plurality of second output ends; and the signal gain adjustment module comprises a plurality of second signal input ends, a plurality of third signal input ends and a plurality of fourth signal input ends. The control module is configured to acquire the receiving signals of the at least two infrared receivers. The first signal output end of the control module is connected with the first input end of the gain adjustment signal output module, each first output end of the gain adjustment signal output module is connected with one second input end of the first signal keeping module, one second output end of the first signal keeping module is connected with one second signal input end of the signal gain adjustment module, and the control module is configured to control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the first part of infrared receivers in a first time period according to the receiving signals of the first part of infrared receivers, and the output is kept by the first signal keeping module and outputted to the signal gain adjustment module. Each first output end of the gain adjustment signal output module is also connected with one third signal input end of the signal gain adjustment module, and the control module is configured to control each first output end of the gain adjustment signal output module to output the gain adjustment signal corresponding to each infrared receiver in the second part of infrared receivers in a second time period according to the receiving signals of the second part of infrared receivers and output the gain adjustment signal to the signal gain adjustment module. The at least two fourth signal input ends of the signal gain adjustment module are connected with the at least two infrared receivers respectively, configured to adopt the gain adjustment signal corresponding to each infrared receiver to perform gain adjustment on the receiving signal acquired by each infrared receiver, so that the signal intensity value of the receiving signal of each infrared receiver is in a target signal intensity range.

9. The infrared signal gain adjustment circuit according to claim 8, wherein: The control module further comprises a first control output end, the first signal keeping module further comprises a controlled end, and the first control output end of the control module is connected with the controlled end of the first signal keeping module.

10. The infrared signal gain adjustment circuit according to claim 9, wherein: The first signal keeping module comprises a plurality of first signal keeping sub-modules, the controlled end of the first signal keeping module comprises the controlled end of each first signal keeping sub-module, each second input end of the first signal keeping module is an input end of each first signal keeping sub-module, and each second output end of the first signal keeping module is an output end of each first signal keeping sub-module.

11. The infrared signal gain adjustment circuit according to claim 10, wherein: the first signal holding sub-module comprises a first switching element and a first holding capacitor; an input terminal of the first switching element is an input terminal of the first signal holding sub-module; an output terminal of the first switching element is an output terminal of the first signal holding sub-module; a driving terminal of the first switching element is a controlled terminal of the first signal holding sub-module; one terminal of the first holding capacitor is connected with the output terminal of the first switching element, and the other terminal of the first holding capacitor is connected with a ground terminal.

12. The infrared signal gain adjustment circuit according to claim 8, wherein: the circuit further comprises a signal amplification module; each first output terminal of the gain adjustment signal output module is connected with one second input terminal of the first signal holding module via the signal amplification module, and each first output terminal of the gain adjustment signal output module is also connected with one third signal input terminal of the signal gain adjustment module via the signal amplification module.

13. The infrared signal gain adjustment circuit according to claim 12, wherein: the signal amplification module comprises a plurality of signal amplification sub-modules; each first output terminal of the gain adjustment signal output module is connected with one second input terminal of the first signal holding module via one signal amplification sub-module, and each first output terminal of the gain adjustment signal output module is also connected with one third signal input terminal of the signal gain adjustment module via one signal amplification sub-module.

14. The infrared signal gain adjustment circuit according to claim 13, wherein: the signal amplification sub-module comprises an operational amplifier, a first resistor, a second resistor, a third resistor and a filter capacitor; a non-inverting input terminal of the operational amplifier is connected with a first output terminal of the gain adjustment signal output module via the first resistor; an inverting input terminal of the operational amplifier is connected with a ground terminal via the second resistor, and the inverting input terminal of the operational amplifier is connected with an output terminal of the operational amplifier via the third resistor; the inverting input terminal of the operational amplifier is connected with one second input terminal of the first signal holding module and one third signal input terminal of the signal gain adjustment module via the filter capacitor; the output terminal of the operational amplifier is connected with a positive power supply terminal, and a negative power supply terminal of the operational amplifier is grounded.

15. The infrared signal gain adjustment circuit according to claim 8, wherein: a second signal holding sub-module is arranged in a circuit path connecting each first output terminal of the gain adjustment signal output module with one third signal input terminal of the signal gain adjustment module; the second signal holding sub-module comprises a plurality of input terminals and a plurality of output terminals; each first output terminal of the gain adjustment signal output module is connected with one input terminal of the second signal holding sub-module, respectively; and one output terminal of the second signal holding sub-module is connected with one third signal input terminal of the signal gain adjustment module. The control module is configured to control each first output end of the gain-adjusted signal output module to output a gain-adjusted signal corresponding to each infrared receiver in the second part of infrared receivers respectively in a second time period according to a received signal of the second part of infrared receivers, and output the gain-adjusted signal to the signal gain-adjusted module through the second signal holding module. 16.The infrared signal gain-adjusted circuit of claim 8, wherein: The control module is a control chip, and the gain-adjusted signal output module is a DAC module in the control chip.

17. An infrared touch frame, wherein, The infrared touch frame comprises a frame, a plurality of infrared emitters, and the infrared signal gain-adjusted circuit of any one of claims 8 to 16; the plurality of infrared emitters and the plurality of infrared receivers in the infrared signal gain-adjusted circuit are respectively arranged on the side edges of the frame; and at least two fourth signal input ends of the signal gain-adjusted module are respectively connected to at least two infrared receivers.

18. An infrared touch device, wherein, The infrared touch frame surrounds the display screen.

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