Infrared touch screen, its coverage detection method and system

Abstract

The present invention discloses an infrared touch screen, a method and system for detecting coverage thereof, the method comprising: a signal strength detection step, detecting the signal strength received by the infrared receiving tube in each infrared pair of tubes; a shielding judgment step, judging whether the corresponding infrared pair of tubes is shielded according to the signal strength detected by each signal strength detection unit; if the signal strength detected by the infrared receiving tube is less than a set first threshold, it is judged that the corresponding infrared pair of tubes is not shielded; if the signal strength detected by the infrared receiving tube is greater than a set second threshold, it is judged that the corresponding infrared pair of tubes is shielded. The infrared touch screen, the method and system for detecting coverage thereof proposed by the present invention can obtain the state data of the touch screen, including whether the touch screen is in a retracted hidden state or in an expanded use state, so as to perform intelligent control on it later.

Description

Technical Field

[0001] The invention belongs to the technical field of touch screens, and relates to an infrared touch screen, and in particular to an infrared touch screen coverage detection method and system. Background Art

[0002] The infrared touch screen includes infrared emitting and receiving sensing elements installed on the outer frame of the touch screen. On the surface of the screen, an infrared detection network is formed. Any touching object can change the infrared on the contact point to realize the touch screen operation. The implementation principle of the infrared touch screen is similar to that of the surface acoustic wave touch, which uses infrared emitting and receiving sensing elements. These elements form an infrared detection network on the surface of the screen. The object of the touch operation (such as a finger) can change the infrared of the contact point, which is then converted into the coordinate position of the touch to realize the response of the operation. On the infrared touch screen, the circuit board device arranged on the four sides of the screen has infrared emitting tubes and infrared receiving tubes, which form a horizontal and vertical cross infrared matrix.

[0003] In some applications, such as in a pull-out whiteboard, the existing infrared touch screen cannot determine whether the whiteboard is in a retracted and hidden state or in an extended state, which brings inconvenience to the intelligent control of the device.

[0004] In view of this, there is an urgent need to design a new infrared touch screen to overcome the above-mentioned defects of the existing touch screen. Summary of the invention

[0005] The present invention provides an infrared touch screen, and a coverage detection method and system thereof, which can obtain state data of the touch screen, including whether the touch screen is in a contracted and hidden state or in an expanded and used state.

[0006] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0007] A method for detecting infrared touch screen coverage, the method comprising:

[0008] a signal strength detection step, detecting the signal strength received by the infrared receiving tube in each infrared pair tube; and

[0009] The blocking judgment step judges whether the corresponding infrared pair tube is blocked according to the signal strength detected in each signal strength detection step; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked.

[0010] As an implementation manner of the present invention, the signal strength detection step includes:

[0011] Collect the analog signal received by the infrared receiving tube;

[0012] Convert the received analog signal into a digital signal;

[0013] The digital signal is converted into a numerical value that can represent the signal strength.

[0014] As an implementation manner of the present invention, the signal strength detection step includes:

[0015] The analog signal received by the infrared receiving tube is collected by a sampling circuit;

[0016] Converting the analog signal collected by the collection circuit into a digital signal through an analog-to-digital conversion circuit;

[0017] The digital signal is converted into a numerical value that can represent the signal strength through a signal strength conversion circuit for comparison in the shielding judgment step.

[0018] As an embodiment of the present invention, the detection method further includes: an obstruction boundary judgment step, judging the obstruction boundary according to the signal strength detected in the signal strength detection step, and if the difference in signal strength received by adjacent infrared receiving tubes is greater than a set third threshold, it is judged that the obstruction boundary is located in the area corresponding to the adjacent infrared pair of tubes.

[0019] As an implementation mode of the present invention, the detection method further comprises: a step of determining the movement of the obstruction, determining the direction of movement of the obstruction according to the change rule of the signal strength detected in the signal strength detection step;

[0020] If it is detected that the signal strength received by each infrared receiving tube within the set range increases in sequence along the set first direction, it is determined that the infrared screen shrinks toward the set first direction;

[0021] If it is detected that the signal strengths received by the infrared receiving tubes within the set range are successively weakened along the set second direction, it is determined that the infrared screen is expanded toward the set second direction.

[0022] An infrared touch screen comprises a touch screen body and an infrared touch screen coverage detection module; the infrared touch screen coverage detection module is connected to the touch screen body and is used to obtain a state of whether the touch screen body is blocked.

[0023] As an implementation mode of the present invention, the touch screen body includes a plurality of infrared pairs of tubes, each of which includes an infrared transmitting tube and an infrared receiving tube; the infrared touch screen coverage detection module includes:

[0024] A plurality of signal strength detection units are respectively connected to corresponding infrared receiving tubes to detect the signal strength received by each infrared receiving tube; and

[0025] The blocking judgment unit is used to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked.

[0026] As an implementation mode of the present invention, the infrared touch screen coverage detection module further comprises:

[0027] An obstruction boundary judgment unit is used to judge the obstruction boundary according to the signal strength detected by each signal strength detection unit, and if the difference in signal strength detected by adjacent infrared receiving tubes is greater than a set third threshold, it is judged that the obstruction boundary is located in the area corresponding to the adjacent infrared receiving tubes;

[0028] The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the signal strength change rule detected by each signal strength detection unit; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively increased along the set first direction, it is judged that the touch screen body is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, it is judged that the infrared touch screen is gradually unblocked in the set second direction.

[0029] As an implementation mode of the present invention, the infrared touch screen further comprises a covering device, each infrared pair of tubes is arranged on the touch screen body, and the touch screen body can be retracted into the covering device;

[0030] If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases in sequence along the set first direction, the obstruction movement judgment unit determines that the infrared screen is retracted into the covering device;

[0031] If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, the shielding object movement judgment unit determines that the infrared screen is gradually pulled away from the covering device.

[0032] An infrared touch screen coverage detection system, the infrared touch screen includes a plurality of infrared pairs of tubes, each infrared pair of tubes includes an infrared transmitting tube and an infrared receiving tube; the detection system includes:

[0033] A plurality of signal strength detection units are respectively connected to corresponding infrared receiving tubes to detect the signal strength received by each infrared receiving tube; and

[0034] The blocking judgment unit is used to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked.

[0035] As an embodiment of the present invention, the detection system further comprises:

[0036] An obstruction boundary judgment unit is used to judge the obstruction boundary according to the signal strength detected by each signal strength detection unit, and if the difference in signal strength detected by adjacent infrared receiving tubes is greater than a set third threshold, it is judged that the obstruction boundary is located in the area corresponding to the adjacent infrared receiving tubes;

[0037] The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the signal strength change law detected by each signal strength detection unit; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively increased along the set first direction, it is judged that the infrared touch screen is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, it is judged that the infrared touch screen is gradually unblocked in the set second direction.

[0038] As an implementation mode of the present invention, the infrared touch screen further comprises an infrared screen and a covering, each infrared pair of tubes is arranged on the infrared screen, and the infrared screen can be retracted into the covering;

[0039] If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases in sequence along the set first direction, the obstruction movement judgment unit determines that the infrared screen is retracted into the obstruction;

[0040] If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, the shielding object movement judgment unit determines that the infrared screen is gradually pulled away from the shielding object.

[0041] The beneficial effect of the present invention is that the infrared touch screen, its coverage detection method and system proposed by the present invention can obtain the state data of the touch screen, including whether the touch screen is in a retracted hidden state or in an expanded use state, so as to perform intelligent control on it subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The figure is a flow chart of an infrared touch screen coverage detection method according to an embodiment of the present invention.

[0043] Figure 2The figure is a flow chart of an infrared touch screen coverage detection method according to an embodiment of the present invention.

[0044] Figure 3 It is a schematic diagram of an infrared touch screen being blocked by an obstruction in one embodiment of the present invention.

[0045] Figure 4 It is a schematic diagram of the principle that the intensity of the received signal increases when the infrared receiving tube is blocked in one embodiment of the present invention.

[0046] Figure 5 The figure is a schematic diagram of the composition of an infrared touch screen coverage detection system in one embodiment of the present invention.

[0047] Figure 6 The figure is a schematic diagram of the composition of an infrared touch screen coverage detection system in one embodiment of the present invention.

[0048] Figure 7 The figure is a schematic diagram of the composition of an infrared touch screen in one embodiment of the present invention.

[0049] Figure 8 FIG. 4 is a schematic diagram of the composition of a signal strength detection unit in an embodiment of the present invention.

[0050] Fig. 9 FIG. 4 is a schematic diagram of the composition of an occlusion judgment unit in an embodiment of the present invention.

[0051] Fig.10 FIG. 4 is a schematic diagram of the composition of an obstruction boundary judgment unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0054] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0055] The present invention discloses an infrared touch screen coverage detection method. Figure 1 This is a flow chart of an infrared touch screen coverage detection method according to an embodiment of the present invention; please refer to Figure 1 , the detection method comprises:

[0056] [Step S1] A signal strength detection step, detecting the signal strength received by the infrared receiving tube in each infrared pair tube;

[0057] [Step S2] An occlusion judgment step, in which the corresponding infrared pair of tubes is judged whether it is blocked according to the signal strength detected in each signal strength detection step; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair of tubes is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair of tubes is blocked.

[0058] In one embodiment of the present invention, the signal strength detection step of step S1 includes: collecting the analog signal received by the infrared receiving tube; converting the received analog signal into a digital signal; converting the digital signal into a numerical value that can represent the signal strength. In one embodiment, the signal strength detection step includes: collecting the analog signal received by the infrared receiving tube through a sampling circuit; converting the received analog signal into a digital signal through an analog-to-digital conversion circuit; converting the digital signal into a numerical value that can represent the signal strength through a signal strength conversion circuit for comparison in the shielding judgment step.

[0059] In one embodiment, the infrared receiving tube of each pair of infrared tubes receives an analog signal, the sampling circuit collects the analog signal received by the infrared receiving tube, the analog-to-digital conversion circuit converts the received analog signal into a digital signal, the signal strength conversion circuit converts the digital signal into a value (such as 0 to 255) that can represent the signal strength, and then in step S2, a judgment is made based on the size of the 0 to 255 number. For example, the value of the number in the normal state is 100, and the value of the number in the covered state can reach 200, thereby determining whether the infrared receiving tube of the corresponding area is blocked.

[0060] Figure 2 This is a flow chart of an infrared touch screen coverage detection method according to an embodiment of the present invention; please refer to Figure 2 In one embodiment of the present invention, the detection method further includes step S22, a step of determining the boundary of an obstruction, and determining the boundary of an obstruction according to the signal strength detected in the signal strength detection step. If the difference in signal strength received by adjacent infrared receiving tubes is greater than a set third threshold, it is determined that the boundary of the obstruction is located in the area corresponding to the adjacent infrared pair of tubes.

[0061] Please continue reading Figure 2 In one embodiment of the present invention, the detection method further includes step S23, a step of judging the movement of the obstruction, and judging the movement direction of the obstruction according to the signal strength change rule detected in the signal strength detection step; if it is detected that the signal strength received by each infrared receiving tube within the set range increases successively along the set first direction, it is judged that the infrared screen shrinks toward the set first direction; if it is detected that the signal strength received by each infrared receiving tube within the set range decreases successively along the set second direction, it is judged that the infrared screen expands toward the set second direction.

[0062] Figure 3 FIG. 1 is a schematic diagram of an infrared touch screen being blocked by an obstruction in one embodiment of the present invention; please refer to FIG. Figure 3 In one embodiment of the present invention, the infrared touch screen further comprises an infrared screen 11 and a covering 13, each infrared pair of tubes is arranged on the infrared screen 11, and the infrared screen 11 can be retracted into the covering 13. In one embodiment, if each signal strength detection unit detects that the signal strength received by each infrared receiving tube 9 within a set range is successively increased along a set first direction, the obstruction movement judgment unit determines that the infrared screen is retracted into the covering; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube 9 within a set range is successively weakened along a set second direction, the obstruction movement judgment unit determines that the infrared screen is gradually pulled away from the covering.

[0063] Figure 4 This is a schematic diagram showing the principle of increasing the strength of received signals when the infrared receiving tube is blocked in one embodiment of the present invention; please refer to Figure 4 When the infrared pair of the infrared screen 11 is blocked by the shielding object 13, the corresponding infrared receiving tube 9 can receive the light directly emitted by the infrared transmitting tube 7 and can also receive the light reflected by the shielding object 13, so the received signal is stronger. In one embodiment of the present invention, the first threshold and the second threshold are adjusted according to the flatness of the shielding object 13, so as to make the detection more accurate.

[0064] The present invention discloses an infrared touch screen coverage detection system. Figure 5 This is a schematic diagram of the composition of an infrared touch screen coverage detection system in one embodiment of the present invention; please refer to Figure 5 The infrared touch screen coverage detection system includes: a plurality of signal strength detection units 1 and an occlusion judgment unit 3. The infrared touch screen includes a plurality of infrared pairs of tubes, each of which includes an infrared emitting tube 7 and an infrared receiving tube 9; in one embodiment of the present invention, the connection lines of the infrared emitting tube 7 and the infrared receiving tube 9 in each infrared pair of tubes are parallel to each other.

[0065] Each signal strength detection unit 1 is connected to the corresponding infrared receiving tube 9, respectively, to detect the signal strength received by each infrared receiving tube 9. The shielding judgment unit 3 is used to judge whether the corresponding infrared tube is shielded according to the signal strength detected by each signal strength detection unit 1; if the signal strength detected by the infrared receiving tube 9 is less than the set first threshold, it is judged that the corresponding infrared tube is not shielded; if the signal strength detected by the infrared receiving tube 9 is greater than the set second threshold, it is judged that the corresponding infrared tube is shielded.

[0066] Figure 6 This is a schematic diagram of the composition of an infrared touch screen coverage detection system in one embodiment of the present invention; please refer to Figure 6 In one embodiment of the present invention, the detection system further includes an obstruction boundary judgment unit 4 for judging the obstruction boundary according to the signal strength detected by each signal strength detection unit 1. If the difference in signal strength detected by adjacent infrared receiving tubes 9 is greater than a set threshold, it is judged that the obstruction boundary is located in the area corresponding to the adjacent infrared receiving tubes.

[0067] In one embodiment of the present invention, the detection system further includes an obstruction movement judgment unit 5, which is used to judge the direction of movement of the obstruction according to the signal strength change rule detected by each signal strength detection unit. If each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube within the set range is successively increased along the set first direction, the obstruction movement judgment unit 5 determines that the infrared touch screen is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, the obstruction movement judgment unit 5 determines that the infrared touch screen is gradually unfolded and unblocked in the set second direction.

[0068] Figure 8 FIG. 1 is a schematic diagram showing the composition of a signal strength detection unit in an embodiment of the present invention; please refer to FIG. Figure 8 In one embodiment, the signal strength detection unit 1 includes a sampling circuit 101, an analog-to-digital conversion circuit 102, and a signal strength conversion circuit 103; the sampling circuit 101 is used to collect the analog signal received by the infrared receiving tube 9; the analog-to-digital conversion circuit 102 is used to convert the analog signal collected by the sampling circuit 101 into a digital signal; the signal strength conversion circuit 103 is used to convert the digital signal into a numerical value that can represent the signal strength for comparison by the shielding judgment unit 3. In one embodiment, the sampling circuit 101 can be a part of the infrared receiving tube 9.

[0069] In one embodiment of the present invention, the infrared receiving tube 9 of each pair of infrared tubes receives a signal, the sampling circuit 101 collects the analog signal received by the infrared receiving tube, the analog-to-digital conversion circuit 102 is used to convert the analog signal collected by the sampling circuit into a digital signal, the signal strength conversion circuit 103 converts the digital signal into a numerical value (0 to 255) that can represent the signal strength, and then the shielding judgment unit 3 makes a judgment based on the size of the 0 to 255 number. For example: the value of the number in the normal state is 100, and the value of the number in the covered state can reach 200, thereby determining whether the infrared receiving tube of the corresponding area is blocked.

[0070] Fig. 9 FIG. 1 is a schematic diagram showing the composition of an occlusion judgment unit in an embodiment of the present invention; Fig. 9In one embodiment of the present invention, the input end of the shielding judgment unit 3 is respectively connected to each signal strength detection circuit 1, and the output end of the shielding judgment unit 3 outputs a signal representing the shielding state of the infrared receiving tube. In one embodiment, the shielding judgment unit 3 includes a plurality of first comparators 301, the non-inverting input end of each first comparator 301 is connected to the corresponding signal strength detection circuit 1 (specifically, the corresponding signal strength conversion circuit 103), the inverting input end of each first comparator 301 is connected to a set reference signal, and the output end of each first comparator 301 outputs a signal representing the shielding state of the corresponding infrared receiving tube.

[0071] Fig.10 FIG. 1 is a schematic diagram showing the composition of an obstruction boundary judgment unit in an embodiment of the present invention; Fig.10 In one embodiment, the obstruction boundary judgment unit 4 includes a plurality of second comparators 401, and the positive input terminal and the negative input terminal of each second comparator 401 are respectively connected to the output terminals of two first comparators 301 for detecting the connection of adjacent infrared receiving tubes 9, and the output terminal of the second comparator 401 outputs a signal representing whether the obstruction states of the two adjacent infrared receiving tubes 9 are the same.

[0072] The detection principle of the infrared touch screen coverage detection system of the present invention is as follows:

[0073] 1. Each signal strength detection unit 1 is connected to a corresponding infrared receiving tube 9 to detect the signal strength received by each infrared receiving tube 9.

[0074] 2. The blocking judgment unit judges whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit 1. Specifically, if the signal strength detected by the infrared receiving tube 9 is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube 9 is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked.

[0075] 3. The barrier boundary judgment unit judges the barrier boundary according to the signal strength detected by each signal strength detection unit 1. Specifically, if the difference in signal strength detected by adjacent infrared receiving tubes 9 is greater than a set threshold, it is judged that the barrier boundary is located in the area corresponding to the adjacent infrared receiving tubes.

[0076] 4. The obstruction movement judgment unit 5 judges the direction of the obstruction movement according to the signal strength change rule detected by each signal strength detection unit. Specifically, if each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube within the set range increases successively along the set first direction, the obstruction movement judgment unit 5 judges that the infrared touch screen is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases successively along the set second direction, the obstruction movement judgment unit 5 judges that the infrared touch screen is gradually unfolded and unblocked in the set second direction. In one embodiment, if each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube 9 within the set range increases successively along the set first direction, the obstruction movement judgment unit 5 judges that the infrared screen is retracted into the obstruction; if each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube 9 within the set range decreases successively along the set second direction, the obstruction movement judgment unit 5 judges that the infrared screen is gradually pulled away from the obstruction.

[0077] The present invention discloses an infrared touch screen. Figure 7 This is a schematic diagram of the partial components of an infrared touch screen in one embodiment of the present invention; please refer to Figure 7 In one embodiment of the present invention, the infrared touch screen includes a touch screen body 10 and an infrared touch screen coverage detection module 20; the infrared touch screen coverage detection module 20 is connected to the touch screen body 10 to obtain whether the touch screen body 10 is blocked.

[0078] In one embodiment of the present invention, the infrared touch screen coverage detection module 20 adopts the composition of the above-mentioned infrared touch screen coverage detection system.

[0079] In summary, the infrared touch screen, its coverage detection method and system proposed in the present invention can obtain the state data of the touch screen, including whether the touch screen is in a retracted hidden state or in an extended use state, so as to perform intelligent control on it subsequently.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The description and application of the present invention here are illustrative and are not intended to limit the scope of the present invention to the above-described embodiments. The deformation and changes of the embodiments disclosed here are possible, and the replacement of the embodiments and the various components equivalent to those of ordinary skill in the art are well known. It should be clear to those skilled in the art that the present invention can be realized in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential characteristics of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A method for detecting infrared touch screen coverage, characterized in that: The detection method comprises: a signal strength detection step, detecting the signal strength received by the infrared receiving tube in each infrared pair tube; and The blocking judgment step is to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected in each signal strength detection step; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked; The detection method further comprises: an obstruction boundary determination step, determining the obstruction boundary according to the signal strength detected in the signal strength detection step, and if the difference in signal strengths received by adjacent infrared receiving tubes is greater than a set third threshold, determining that the obstruction boundary is located in an area corresponding to the adjacent infrared receiving tubes; The step of judging the movement of the obstruction is to judge the movement direction of the obstruction according to the signal strength change rule detected in the signal strength detection step; if it is detected that the signal strength received by each infrared receiving tube within the set range increases successively along the set first direction, it is judged that the infrared screen shrinks toward the set first direction; if it is detected that the signal strength received by each infrared receiving tube within the set range decreases successively along the set second direction, it is judged that the infrared screen expands toward the set second direction.

2. The infrared touch screen coverage detection method according to claim 1, characterized in that: The signal strength detection step comprises: Collect the analog signal received by the infrared receiving tube; Convert the received analog signal into a digital signal; The digital signal is converted into a numerical value that can represent the signal strength.

3. An infrared touch screen, characterized in that: The infrared touch screen includes a touch screen body and an infrared touch screen coverage detection module; the infrared touch screen coverage detection module is connected to the touch screen body to obtain a state of whether the touch screen body is blocked; The infrared touch screen coverage detection module further comprises: An obstruction boundary judgment unit is used to judge the obstruction boundary according to the signal strength detected by each signal strength detection unit, and if the difference in signal strength detected by adjacent infrared receiving tubes is greater than a set third threshold, it is judged that the obstruction boundary is located in the area corresponding to the adjacent infrared receiving tubes; The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the signal strength change rule detected by each signal strength detection unit; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively increased along the set first direction, it is judged that the touch screen body is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, it is judged that the infrared touch screen is gradually unblocked in the set second direction.

4. The infrared touch screen according to claim 3, characterized in that: The touch screen body includes a plurality of infrared pairs of tubes, each of which includes an infrared transmitting tube and an infrared receiving tube; the infrared touch screen coverage detection module includes: A plurality of signal strength detection units are respectively connected to corresponding infrared receiving tubes to detect the signal strength received by each infrared receiving tube; and The blocking judgment unit is used to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked.

5. The infrared touch screen according to claim 3, characterized in that: The infrared touch screen also includes a covering device, each infrared pair of tubes is arranged on the touch screen body, and the touch screen body can be retracted into the covering device; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases in sequence along the set first direction, the obstruction movement judgment unit determines that the infrared screen is retracted into the covering device; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, the shielding object movement judgment unit determines that the infrared screen is gradually pulled away from the covering device.

6. An infrared touch screen coverage detection system, the infrared touch screen comprises a plurality of infrared pairs of tubes, each infrared pair of tubes comprises an infrared transmitting tube and an infrared receiving tube; characterized in that: The detection system comprises: A plurality of signal strength detection units are respectively connected to corresponding infrared receiving tubes to detect the signal strength received by each infrared receiving tube; The blocking judgment unit is used to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared pair tube is not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is judged that the corresponding infrared pair tube is blocked; an obstruction boundary determination unit, configured to determine the obstruction boundary according to the signal strength detected by each signal strength detection unit, and if the difference in signal strength detected by adjacent infrared receiving tubes is greater than a set third threshold, it is determined that the obstruction boundary is located in the area corresponding to the adjacent infrared receiving tubes; and The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the signal strength change law detected by each signal strength detection unit; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively increased along the set first direction, it is judged that the infrared touch screen is gradually blocked in the set first direction; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, it is judged that the infrared touch screen is gradually unblocked in the set second direction.

7. The infrared touch screen coverage detection system according to claim 6, characterized in that: The infrared touch screen also includes an infrared screen and a cover, each infrared pair of tubes is arranged on the infrared screen, and the infrared screen can be retracted in the cover; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases in sequence along the set first direction, the obstruction movement judgment unit determines that the infrared screen is retracted into the obstruction; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range is successively weakened along the set second direction, the shielding object movement judgment unit determines that the infrared screen is gradually pulled away from the shielding object.

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