CN110888560A - Infrared touch screen, and coverage detection method and system thereof - Google Patents

Abstract

The invention discloses an infrared touch screen, a coverage detection method and a system thereof, wherein the method comprises the following steps: a signal intensity detection step, in which the intensity of the signal received by the infrared receiving tube in each infrared pair tube is detected; a shielding judgment step, namely judging whether the corresponding infrared geminate transistors are shielded or not according to the signal intensity detected by each signal intensity detection unit; if the signal intensity detected by the infrared receiving tube is smaller than a set first threshold value, judging that the corresponding infrared geminate transistor is not shielded; and if the signal intensity detected by the infrared receiving tube is greater than a set second threshold value, judging that the corresponding infrared pair tube is shielded. The infrared touch screen, the coverage detection method and the coverage detection system can acquire state data of the touch screen, including whether the touch screen is in a retracted hidden state or in an expanded use state, so that the touch screen can be intelligently controlled subsequently.

Description

Infrared touch screen, its coverage detection method and system

technical field

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

Background technique

The infrared touch screen includes infrared emitting and receiving sensing elements mounted 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 rays on the contact to realize the touch screen operation. The realization 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 components form an infrared detection network on the surface of the screen, and the touch-operated object (such as a finger) can change the infrared rays of the touch point, and then convert it into the coordinate position of the touch to realize the operation response. On the infrared touch screen, the circuit boards arranged on the four sides of the screen are equipped with infrared emitting tubes and infrared receiving tubes, corresponding to form a horizontal and vertical cross-infrared matrix.

In some application modes of the existing infrared touch screen, for example, in the application of a pull-out whiteboard, either the whiteboard is in a retracted and hidden state or in an expanded state, which will bring inconvenience to the intelligent control of the device.

In view of this, it is urgent to design a new infrared touch screen so as to overcome the above-mentioned defects of the existing touch screen.

SUMMARY OF THE INVENTION

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

In order to solve the above-mentioned technical problems, according to one aspect of the present invention, the following technical solutions are adopted:

An infrared touch screen coverage detection method, the detection method comprising:

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 paired 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 paired pipe is not blocked; If the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked.

As an embodiment of the present invention, the signal strength detection step includes:

Collect the analog signal received by the infrared receiving tube;

Convert the received analog signal to a digital signal;

The digital signal is converted into a numerical value that can characterize the strength of the signal.

As an embodiment of the present invention, the signal strength detection step includes:

Collect the analog signal received by the infrared receiving tube through the sampling circuit;

Convert the analog signal collected by the acquisition circuit into a digital signal through an analog-to-digital conversion circuit;

The digital signal is converted into a numerical value that can characterize the signal strength by the signal strength conversion circuit, which is used for comparison in the occlusion determination step.

As an embodiment of the present invention, the detection method further includes: a step of judging the boundary of the obstruction, and judging the boundary of the obstruction according to the signal strength detected in the signal strength detection step, if the difference in the signal strength received by the adjacent infrared receiving tubes is greater than If the third threshold is set, it is determined that the boundary line of the blocking object is located in the area corresponding to the adjacent infrared paired tubes.

As an embodiment of the present invention, the detection method further includes: a step of judging the movement of the occluder, and judging the movement direction of the occluder according to the change rule of the signal strength detected in the step of detecting the signal strength;

If it is detected that the signal strengths received by each infrared receiving tube within the set range increase sequentially along the set first direction, it is judged that the infrared screen shrinks in the set first direction;

If it is detected that the signal strengths received by each infrared receiving tube within the set range are weakened sequentially along the set second direction, it is determined that the infrared screen is expanded toward the set second direction.

An 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 whether the touch screen body is blocked.

As an embodiment of the present invention, the touch screen body includes a plurality of infrared pairs of tubes, each of which includes an infrared emission tube and an infrared receiver tube; the infrared touch screen coverage detection module includes:

A plurality of signal strength detection units are respectively connected to the corresponding infrared receiving tubes for detecting 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 Blocking; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked.

As an embodiment of the present invention, the infrared touch screen coverage detection module further includes:

The occlusion boundary judging unit is used for judging the occlusion boundary according to the signal strength detected by each signal strength detection unit. If the difference between the signal strengths detected by the adjacent infrared receiving tubes is greater than the set third threshold, it is determined that the occlusion boundary is located in the The area corresponding to the adjacent infrared receiving tube;

The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit; if each signal intensity detection unit detects that the signal intensity received by each infrared receiving tube within the set range is along the If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction , then it is judged that the infrared touch screen is gradually released from the block in the set second direction.

As an embodiment of the present invention, the infrared touch screen further includes a cover device, each infrared pair tube is arranged on the touch screen body, and the touch screen body can be retracted in the cover device;

If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases sequentially along the set first direction, the blocking object motion judgment unit judges that the infrared screen is shrunk into the blocking device;

If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction, the blocker motion judgment unit judges that the infrared screen is gradually pulled away from the cover device .

An infrared touch screen coverage detection system, the infrared touch screen includes a plurality of infrared pair tubes, each infrared pair tube includes an infrared emission tube and an infrared receiver tube; the detection system includes:

A plurality of signal strength detection units are respectively connected to the corresponding infrared receiving tubes for detecting 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 Blocking; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked.

As an embodiment of the present invention, the detection system further includes:

The occlusion boundary judging unit is used for judging the occlusion boundary according to the signal strength detected by each signal strength detection unit. If the difference between the signal strengths detected by the adjacent infrared receiving tubes is greater than the set third threshold, it is determined that the occlusion boundary is located in the The area corresponding to the adjacent infrared receiving tube;

The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit; if each signal intensity detection unit detects that the signal intensity received by each infrared receiving tube within the set range is along the If the first direction is set to increase in turn, 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 weakened sequentially along the set second direction , then it is judged that the infrared touch screen is gradually released from the block in the set second direction.

As an embodiment of the present invention, the infrared touch screen further includes an infrared screen and a cover, each infrared pair tube 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 sequentially along the set first direction, the blocking object motion judging unit judges that the infrared screen shrinks into the blocking object;

If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction, the block motion judgment unit judges that the infrared screen is gradually pulled away from the cover .

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 and hidden state or in an unfolded use state, so as to intelligently control it later.

Description of drawings

FIG. 1 is a flowchart of an infrared touch screen coverage detection method according to an embodiment of the present invention.

FIG. 2 is a flowchart of an infrared touch screen coverage detection method according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of an infrared touch screen being blocked by a blocking object in an embodiment of the present invention.

FIG. 4 is a schematic diagram of the principle that the received signal strength of the infrared receiving tube increases in a blocked state according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of the composition of an infrared touch screen coverage detection system according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of the composition of an infrared touch screen coverage detection system according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of the composition of an infrared touch screen according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of the composition of a signal strength detection unit in an embodiment of the present invention.

FIG. 9 is a schematic diagram of the composition of an occlusion determination unit in an embodiment of the present invention.

FIG. 10 is a schematic diagram of the composition of an occluder boundary determination unit according to an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with the examples, but 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.

The description in this section is only for a few typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. It is also within the scope of the description and protection of the present invention to replace some technical features in the embodiments with the same or similar prior art means.

The present invention discloses an infrared touch screen coverage detection method. FIG. 1 is a flowchart of an infrared touch screen coverage detection method in an embodiment of the present invention; please refer to FIG. 1 , the detection method includes:

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

[Step S2] the blocking judgment step, according to the signal strength detected in each signal strength detection step, to judge whether the corresponding infrared paired tube is blocked; if the signal strength detected by the infrared receiving tube is less than the set first threshold, it is judged that the corresponding infrared paired tube is Not blocked; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked.

In an embodiment of the present invention, the signal strength detection step of step S1 includes: collecting an analog signal received by an infrared receiving tube; converting the received analog signal into a digital signal; and converting the digital signal into a numerical value that can characterize the signal strength. In one embodiment, the signal strength detection step includes: collecting an analog signal received by an 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 through a signal strength conversion circuit The signal is converted into a numerical value that can characterize the strength of the signal for comparison in the occlusion determination step.

In one embodiment, each pair of infrared receiver tubes of the infrared pair tube receives an analog signal, the sampling circuit collects the analog signal received by the infrared receiver tube, the analog-to-digital conversion circuit converts the received analog signal into a digital signal, and the signal strength conversion circuit converts the received analog signal into a digital signal. The digital signal is converted into a numerical value (such as 0-255) that can characterize the signal strength, and then in step S2, judgment is made according to the size of the 0-255 number. For example, the value of the number in the normal state is 100, and the value of the number in the covering state can reach 200, so it can be judged whether the infrared receiving tube in the corresponding area is blocked.

FIG. 2 is a flowchart of an infrared touch screen coverage detection method in an embodiment of the present invention; please refer to FIG. 2, in an embodiment of the present invention, the detection method further includes step S22, a step of judging the boundary of an obstructing object, according to the signal strength The detected signal strength in the detection step determines the boundary line of the blocking object. If the difference in signal strength received by the adjacent infrared receiving tubes is greater than the set third threshold, it is judged that the blocking object boundary line is located in the area corresponding to the adjacent infrared paired tubes.

Please continue to refer to FIG. 2 , in an embodiment of the present invention, the detection method further includes step S23 , a step of judging the movement of an obstruction, and judging the movement direction of the obstruction according to the change law of the signal intensity detected in the signal intensity detection step; When the signal strength received by each infrared receiving tube within the set range increases sequentially along the set first direction, it is judged that the infrared screen shrinks in the set first direction; if the signal received by each infrared receiving tube within the set range is detected If the intensity decreases sequentially along the set second direction, it is judged that the infrared screen expands in the set second direction.

FIG. 3 is a schematic diagram of an infrared touch screen being blocked by a blocking object in an embodiment of the present invention; please refer to FIG. 3 , in an embodiment of the present invention, the infrared touch screen further includes an infrared screen 11 and a cover 13, each infrared Set on the infrared screen 11 , the infrared screen 11 can be retracted inside the cover 13 . In one embodiment, if each signal strength detection unit detects that the signal strength received by each infrared receiving tube 9 within the set range increases sequentially along the set first direction, the blocker motion judgment unit judges that the infrared screen has shrunk to Inside the cover; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube 9 within the set range gradually weakens along the set second direction, then the block motion judgment unit judges that the infrared screen is from all Gradually open the cover.

FIG. 4 is a schematic diagram of the principle that the received signal strength of the infrared receiving tube increases in a blocked state according to an embodiment of the present invention; please refer to FIG. 9 can receive the light directly emitted by the infrared emitting tube 7, and at the same time can receive the light reflected by the shielding object 13, so the received signal is stronger. In an embodiment of the present invention, the above-mentioned first threshold and second threshold are adjusted according to the flatness of the obstruction 13 , so as to make the detection more accurate.

The present invention discloses an infrared touch screen coverage detection system. FIG. 5 is a schematic diagram of the composition of an infrared touch screen coverage detection system in an embodiment of the present invention; please refer to FIG. 5 , the infrared touch screen coverage detection system includes: a plurality of signal strength detection units 1 and an occlusion determination unit 3 . The infrared touch screen includes a plurality of infrared pair tubes, and each infrared pair tube includes an infrared emission tube 7 and an infrared receiver tube 9; The lines are parallel to each other.

Each signal strength detection unit 1 is respectively connected to the corresponding infrared receiving tube 9 for detecting the signal strength received by each infrared receiving tube 9 . The blocking judgment unit 3 is used to judge whether the corresponding infrared pair tube is blocked according to the signal strength detected by each signal strength detection unit 1; The paired tube is not blocked; if the signal strength detected by the infrared receiving tube 9 is greater than the set second threshold, it is determined that the corresponding infrared paired tube is blocked.

FIG. 6 is a schematic diagram of the composition of an infrared touch screen coverage detection system in an embodiment of the present invention; please refer to FIG. 6 , in an embodiment of the present invention, the detection system further includes an obstruction boundary judging unit 4 for determining the boundary of each signal according to the strength of each signal. The signal strength detected by the detection unit 1 determines the boundary of the obstruction. If the difference in signal strength detected by the adjacent infrared receiving tubes 9 is greater than the set threshold, it is determined that the boundary of the obstruction is located in the area corresponding to the adjacent infrared reception tubes.

In an embodiment of the present invention, the detection system further includes an obstruction movement determination unit 5, which is used to determine the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit. If each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube within the set range increases sequentially along the set first direction, the blocking object motion 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 is weakened in turn along the set second direction, then the obstruction movement judgment unit 5 judges that the infrared touch screen is gradually expanded and released in the set second direction. occlude.

8 is a schematic diagram of the composition of a signal strength detection unit in an embodiment of the present invention; please refer to FIG. 8 , in an 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 The digital signal is converted into a numerical value that can characterize the strength of the signal, which is used by the occlusion determination unit 3 for comparison. In one embodiment, the sampling circuit 101 may be a part of the infrared receiving tube 9 .

In an embodiment of the present invention, each pair of infrared receiving tubes 9 of the infrared pair tube receives signals, the sampling circuit 101 collects the analog signals received by the infrared receiving tubes, and the analog-to-digital conversion circuit 102 is used to convert the analog signals collected by the sampling circuit into Digital signal, the signal strength conversion circuit 103 converts the digital signal into a numerical value (0-255) that can represent the signal strength, and then the occlusion judgment unit 3 judges according to the size of the 0-255 number. For example, the value of the number in the normal state is 100, and the value of the number in the covering state can reach 200, so it can be judged whether the infrared receiving tube in the corresponding area is blocked.

FIG. 9 is a schematic diagram of the composition of the occlusion determination unit in an embodiment of the present invention; please refer to FIG. 9 , in an embodiment of the present invention, the input ends of the occlusion determination unit 3 are respectively connected to the signal strength detection circuits 1, and the The output end of the blocking judgment unit 3 outputs a signal representing the blocking state of the infrared receiving tube. In one embodiment, the occlusion determination unit 3 includes a plurality of first comparators 301, and 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 terminal of each first comparator 301 is connected to the set reference signal, and the output terminal of each first comparator 301 outputs a signal representing the corresponding infrared shielding state of the tube.

10 is a schematic diagram of the composition of the occluder boundary determination unit in an embodiment of the present invention; please refer to FIG. 10 , in an embodiment, the occluder boundary determination unit 4 includes a plurality of second comparators 401 , each of which The non-inverting input terminal and the inverting input terminal of 401 are respectively connected to the output terminals of the two first comparators 301 for detecting and connecting the adjacent infrared receiving tubes 9, and the output terminal output of the second comparator 401 represents two adjacent infrared receivers. Receive a signal indicating whether the blocked state of the tube 9 is the same.

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

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

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, it includes: if the signal intensity detected by the infrared receiving tube 9 is less than the set first threshold, it is determined that the corresponding infrared pair tube is not blocked; if the signal intensity detected by the infrared receiving tube 9 is greater than the set second threshold, it is determined that the corresponding infrared tube is not blocked. The infrared pair tube is blocked.

3. The blocking object boundary determination unit determines the blocking object boundary according to the signal strength detected by each signal strength detection unit 1 . Specifically, it includes: if the signal strength difference detected by the adjacent infrared receiving tubes 9 is greater than the set threshold, it is determined that the boundary line of the obstruction is located in the area corresponding to the adjacent infrared receiving tubes.

4. The obstruction movement determination unit 5 determines the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit. Specifically, it includes: if each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube within the set range increases sequentially along the set first direction, the blocking object movement judgment unit 5 judges that the infrared touch screen is in the set first direction is gradually blocked; if each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases in turn along the set second direction, the blocking object movement judgment unit 5 judges that the infrared touch screen is in the set second direction. Gradually expand Unblock. 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 sequentially along the set first direction, the blocking object motion judgment unit 5 judges the infrared screen. shrink into the cover; if each signal strength detection unit 1 detects that the signal strength received by each infrared receiving tube 9 within the set range is weakened sequentially along the set second direction, then the block motion judgment unit 5 judges The infrared screen is gradually pulled away from the cover.

The present invention discloses an infrared touch screen, and FIG. 7 is a schematic diagram of a part of the infrared touch screen in an embodiment of the present invention; please refer to FIG. 7 , in an embodiment of the present invention, the infrared touch screen includes a touch screen body 10 and an infrared touch screen covering The detection module 20; the infrared touch screen coverage detection module 20 is connected to the touch screen body 10 to obtain the state of whether the touch screen body 10 is blocked.

In an 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.

To sum up, the infrared touch screen, its coverage detection method and system proposed by the present invention can obtain the status data of the touch screen, including whether the touch screen is in a retracted and hidden state or in an unfolded use state, so as to intelligently control it later.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The description and application of the present invention herein is illustrative, and is not intended to limit the scope of the present invention to the above-described embodiments. Variations and variations of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments are known to those of ordinary skill in the art. It should be apparent to those skilled in the art that the present invention may be implemented in other forms, structures, arrangements, proportions, and with other components, materials and components without departing from the spirit or essential characteristics of the invention. Other modifications and changes of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.

Claims (10)

1. An infrared touch screen coverage detection method, wherein 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 paired 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 paired pipe is not blocked; If the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked. 2. The infrared touch screen coverage detection method according to claim 1, wherein: The signal strength detection step includes: Collect the analog signal received by the infrared receiving tube; Convert the received analog signal to a digital signal; The digital signal is converted into a numerical value that can characterize the strength of the signal. 3. The infrared touch screen coverage detection method according to claim 1, wherein: The detection method further includes: In the step of judging the boundary of the obstruction, the boundary of the obstruction is determined according to the signal strength detected in the signal strength detection step. If the difference of the signal strength received by the adjacent infrared receiving tubes is greater than the set third threshold, it is determined that the boundary of the obstruction is located in the adjacent infrared The area corresponding to the tube; In the step of judging the movement of the obstruction, the movement direction of the obstruction is determined according to the variation law of the signal intensity detected in the signal intensity detection step; It is judged that the infrared screen shrinks in the first set direction; if it is detected that the signal strength received by each infrared receiving tube within the set range decreases in turn along the set second direction, the infrared screen is judged to expand in the set second direction. 4. An infrared touch screen, characterized in that the 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 to obtain whether the touch screen body is blocked. 5. The infrared touch screen according to claim 4, wherein: The touch screen body includes a plurality of infrared tubes, and each infrared tube includes an infrared emission 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 the corresponding infrared receiving tubes for detecting 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 Blocking; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked. 6. The infrared touch screen according to claim 4, wherein: The infrared touch screen coverage detection module further includes: The occlusion boundary judging unit is used for judging the occlusion boundary according to the signal strength detected by each signal strength detection unit. If the difference between the signal strengths detected by the adjacent infrared receiving tubes is greater than the set third threshold, it is determined that the occlusion boundary is located in the The area corresponding to the adjacent infrared receiving tube; The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit; if each signal intensity detection unit detects that the signal intensity received by each infrared receiving tube within the set range is along the If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction , then it is judged that the infrared touch screen is gradually released from the block in the set second direction. 7. The infrared touch screen according to claim 4, wherein: The infrared touch screen further includes a cover device, each infrared pair tube is arranged on the touch screen body, and the touch screen body can be retracted in the cover device; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range increases sequentially along the set first direction, the blocking object motion judgment unit judges that the infrared screen is shrunk into the blocking device; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction, the blocker motion judgment unit judges that the infrared screen is gradually pulled away from the cover device . 8. An infrared touch screen coverage detection system, the infrared touch screen comprises a plurality of infrared pair tubes, and each infrared pair tube comprises an infrared emission tube and an infrared receiver tube; characterized in that, the detection system comprises: A plurality of signal strength detection units are respectively connected to the corresponding infrared receiving tubes for detecting 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 Blocking; if the signal strength detected by the infrared receiving tube is greater than the set second threshold, it is determined that the corresponding infrared pair tube is blocked. 9. The infrared touch screen coverage detection system according to claim 8, wherein: The detection system further includes: The occlusion boundary judging unit is used for judging the occlusion boundary according to the signal strength detected by each signal strength detection unit. If the difference between the signal strengths detected by the adjacent infrared receiving tubes is greater than the set third threshold, it is determined that the occlusion boundary is located in the The area corresponding to the adjacent infrared receiving tube; The obstruction movement judgment unit is used to judge the movement direction of the obstruction according to the change rule of the signal intensity detected by each signal intensity detection unit; if each signal intensity detection unit detects that the signal intensity received by each infrared receiving tube within the set range is along the If the first direction is set to increase in turn, 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 weakened sequentially along the set second direction , then it is judged that the infrared touch screen is gradually released from the block in the set second direction. 10. The infrared touch screen coverage detection system according to claim 8, wherein: The infrared touch screen further includes an infrared screen and a cover, each infrared pair tube 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 sequentially along the set first direction, the blocking object motion judging unit judges that the infrared screen shrinks into the blocking object; If each signal strength detection unit detects that the signal strength received by each infrared receiving tube within the set range decreases sequentially along the set second direction, the block motion judgment unit judges that the infrared screen is gradually pulled away from the cover .

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