Positioning photoelectric detector, detection system, touch screen, detection method and application

Abstract

The present invention discloses a positioning photoelectric detector, a detection system, a touch screen, a detection method and an application. The touch screen includes a touch screen body and a positioning detection system for the touch screen body. The positioning detection system includes two groups of photoelectric detectors, and the photoelectric detector includes an optical imaging system for collecting touch surface image information, a light scanning mechanism that can emit light to scan the touch surface, a range positioning unit that can form a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system. The present invention reduces the installation error, thereby reducing the error between the actual installation position of the range positioning unit and the P1 of the touch screen itself, thereby improving the installation accuracy; and the present invention is not limited to the size of the touch screen, and is not affected by the assembly accuracy and processing accuracy, so that a touch positioning characteristic with higher positioning accuracy can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of electronics, and in particular to a positioning photoelectric detector, a detection system, a touch screen, a detection method and an application thereof. Background Art

[0002] At present, touch screens have been promoted to many fields as the easiest human-computer interaction technology. Among the touch screen implementation schemes based on optoelectronic technology, the most mature one is to arrange infrared transmitting tubes and infrared receiving tubes on the four sides of the screen, forming a horizontal and vertical cross infrared matrix corresponding to each other. The specific position of the indicator can be detected according to the different shielding light, and the application range is very wide; but its resolution is limited by the number of infrared tubes, and it is difficult to make it very high, and the currently disclosed touch devices need to be made according to the size of the display screen; as the area of ​​the display screen increases, its cost increases accordingly. The touch devices between touch screens of different sizes cannot be replaced and used interchangeably because of their fixed size.

[0003] In view of the above situation, the prior art CN201616089U discloses a touch screen and touch system, which includes a lens, an image sensor, a touch surface and a processing unit. The lens collects touch information of the touch surface and transmits it to the image sensor through an optical fiber to form an image on the image sensor and generate image information. The image sensor transmits the image information to the processing unit, and the processing unit uses the triangulation method to process the image data from the image sensor to obtain the position of the indicator. However, this prior art has many defects when used, such as low coordinate accuracy, poor adjustability, poor matching, inconvenient versatility, and blind spots in scanning. The details are as follows:

[0004] 1. Low coordinate accuracy: Due to processing errors and assembly errors, there are certain errors between the designed dimensions and the actual dimensions of any structural product. Therefore, directly outputting the designed dimension information to apply it to the actually manufactured touch screen will result in its coordinate reference being unable to fully match the actual touch screen, resulting in coordinate errors. Specifically, in the touch system of this prior art, its coordinate reference is the principal point of the objective lens of the optical lens as the coordinate reference, which is independent of the touch screen and lacks relevance, resulting in the determination of its coordinates being limited by the installation position of the lens, the manufacturing error of the lens, the assembly error of the lens, etc. Whether it is the error in the manufacturing and assembly of the lens itself, or the error between its actual installation position and the designed installation position, it will directly lead to errors in the touch positioning read by the touch system.

[0005] 2. Poor adjustability and fault tolerance: This prior art cannot adjust the lens position and can only be installed in a preset position. Once the lens position is adjusted, the error between the coordinate parameters of the image sensor and the corresponding touch screen increases;

[0006] 3. Inconvenient versatility: When it is used for touch screens of different models, the corresponding parameter information needs to be reset, which makes it more troublesome to use;

[0007] 4. Identification is prone to errors and the amount of data is large: This technology analyzes and processes the image information on the touch surface. It is not only easy to identify the wrong touch-like image, but also needs to find the correct touch position in the image without any obvious determination. The amount of data processing is large and cumbersome;

[0008] 5. There are blind spots in scanning: Even if equipped with a light source, there will be a blind spot when the reflection angle at the touch point is not at the receiving angle.

[0009] In response to the above-mentioned defect 5, the prior art CN109992164A discloses a laser scanning touch screen, which includes a laser scanning device for scanning a touch piece on a touch surface, a receiving head installed on the scanning device and rotating synchronously with the laser head of the scanning device, and receiving the light reflected by the touch piece at the same time, and a rotation angle detection device for collecting the emission angle of the current laser irradiating the touch piece after the receiving head receives the light. In this touch screen, although the touch screen position detection is based on the light emission signal, thereby solving the existing touch screen limited by the number of infrared tubes and other conditions / defects, this touch screen must be equipped with a rotating laser light source for scanning, and the reflected light must be accurately reflected on the receiving head that rotates synchronously with the laser head. It has extremely high requirements for the accuracy of the optical path for scanning the touch surface, resulting in numerous design requirements, high assembly requirements, and high costs. In addition, in this prior art, a code disk is used to collect the rotation angle, which has low accuracy and is not suitable for the high-precision requirements of most scenarios used by existing touch screens. At the same time, although this technology can improve the receiving effect and the acceptance rate through rotation scanning, its effect on the receiving hand is still poor. Summary of the invention

[0010] The purpose of the present invention is to provide a positioning photoelectric detector, a detection system, a touch screen, a detection method and an application, which solve the above-mentioned technical problems of the existing touch position detection device, such as low coordinate accuracy, poor adjustability, poor matching, inconvenient versatility, and blind spots in scanning.

[0011] The technical solution adopted by the present invention is as follows:

[0012] A touch positioning photoelectric detector, comprising an optical imaging system for collecting image information of a touch surface, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system;

[0013] The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to an information processing module.

[0014] Furthermore, the optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner, and the range positioning unit can collect the light pulse signal emitted by the optical scanning mechanism and can send the collected signal to the information processing module.

[0015] Furthermore, the optical scanning mechanism includes a light source, a motor and a reflective prism, the main shaft of the motor is a hollow main shaft, the light source is placed at one end of the main shaft, and the reflective prism is installed at the other end of the main shaft. The light beam emitted by the light source passes through the inner hole of the main shaft and enters from the incident surface of the reflective prism, and is emitted from the exit surface of the reflective prism to scan the touch surface.

[0016] Furthermore, the lens combination of the optical lens is a fisheye lens.

[0017] Furthermore, the range positioning unit is any one of the following photosensitive elements: a photoresistor, a photodiode, and a phototransistor.

[0018] Furthermore, the optical imaging system also includes a filter arranged on the optical path between the optical lens and the image sensor.

[0019] Furthermore, the light source of the optical scanning mechanism is a point light source or a line light source.

[0020] A touch positioning photoelectric detection system, comprising two groups of photoelectric detectors, the two groups of photoelectric detectors are respectively a left photoelectric detector and a right photoelectric detector, and the photoelectric detectors include an optical imaging system for collecting touch surface image information, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system;

[0021] The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to the information processing module;

[0022] And the information processing modules of the photoelectric detectors are all connected to the host signal.

[0023] Furthermore, the optical scanning mechanism emits a light beam that scans the touch surface in a rotating manner, and the optical scanning mechanisms of the two groups of photodetectors scan the touch surface in an alternating rotating manner.

[0024] A touch screen, comprising a touch screen body and a positioning detection system for the touch screen body, wherein the positioning detection system comprises two groups of photoelectric detectors, the two groups of photoelectric detectors are respectively a left photoelectric detector and a right photoelectric detector, and the photoelectric detector comprises an optical imaging system for collecting image information of a touch surface, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module for receiving information collected from the optical imaging system and controlling the working state of the optical imaging system;

[0025] The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to the information processing module;

[0026] And the information processing modules of the photoelectric detectors are all connected to the host signal;

[0027] The fields of view of the optical lenses all include the touch surface, and the range positioning units of the two groups of photoelectric detectors are respectively located at two corners of one side of the touch screen body.

[0028] Furthermore, the connection line between the range positioning units is parallel to a side line of the touch screen body;

[0029] And the line between the range positioning unit of the left photodetector and the range positioning unit of the right photodetector is parallel to the line between the objective lens center point of the optical lens of the left photodetector and the objective lens center point of the optical lens of the right photodetector.

[0030] The touch positioning detection method includes the following steps:

[0031] S1, photodetector initialization:

[0032] ① Initialization of the storage unit of the information processing module;

[0033] ② Initialization of the signal receiving and sending ports of the information processing module;

[0034] ③ Initialization of the peripheral device interface of the information processing module;

[0035] ④ The information processing module collects the range equivalent of the edge of the touch screen where two range positioning units are set;

[0036] ⑤Other system initialization;

[0037] S2, the optical scanning mechanism is started, the range positioning unit reflects the light of the optical scanning mechanism, and the light spot formed by the reflection of the range positioning unit in the left photoelectric detector is the P1 point light spot, and the light spot formed by the reflection of the range positioning unit in the right photoelectric detector is the P2 point light spot;

[0038] S3, the optical imaging systems of the photoelectric detectors are all started to perform exposure photography: the optical imaging system captures the angle information of the light spot at the range positioning unit, and sends the angle information to the information processing module;

[0039] S4, the information processing module reads the angle information obtained in S3, and determines the coordinates of the point P1 and the point P2 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation method;

[0040] S5. When in use, the touch point on the touch screen is point P3, the light of the light scanning mechanism reflected by point P3 forms a light spot at point P3, the optical imaging system captures the angle information of the light spot at the touch point, and sends the angle information to the information processing module;

[0041] S6, the information processing module determines the coordinate value of point P3 relative to point P1 according to the triangulation positioning method;

[0042] The information processing module automatically compares the coordinate value of point P3 relative to P1 with the limit coordinate value of point P1 on the touch surface, and determines whether the coordinate value of P3 is within the range of the pixel area of ​​the touch surface. If it is, it is a valid value and is sent to the host. Otherwise, the data is discarded.

[0043] S7, the information processing module sends the coordinate value of point P3 relative to point P1 to the host;

[0044] S8. Repeat steps S5 to S7 to track the movement trajectory of the touch point.

[0045] Further, the optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner;

[0046] In S3, when the range positioning unit in the left photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P1 captured by the optical imaging system, and the image information is sent to the information processing module; when the range positioning unit in the right photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P2 captured by the optical imaging system, and the image information is sent to the information processing module;

[0047] In S4, the information processing module reads the image information of the light spot including the point P1 obtained in S3, and determines the coordinates of the point P1 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation positioning method;

[0048] The information processing module reads the image information of the light spot including the point P2 obtained in S3, and determines the coordinates of the point P2 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation positioning method.

[0049] The invention discloses the application of the touch positioning photoelectric detection system designed by the invention in a touch feedback system.

[0050] Due to the adoption of this technical solution, the beneficial effects of the present invention are:

[0051] 1. The positioning photoelectric detector, detection system, touch screen, detection method and application of the present invention are based on installing a range positioning unit on a known coordinate point on the touch surface as a "reference point" to perform subsequent coordinate measurement of the indicator. In this way, not only can the range positioning unit select a small object to achieve light reflection and reduce the overall volume of image acquisition, but also the installation error can be reduced based on the small range positioning unit, thereby reducing the error between the actual installation position of the range positioning unit and P1 of the touch screen itself, and then improving the installation accuracy; and no matter what the size of the touch screen actually manufactured is, what the size of the optical imaging system is, etc., the coordinates can be re-established based on the range positioning unit, which is not limited by the size of the touch screen, and is not affected by the assembly accuracy and processing accuracy. When it is actually used, it is only limited by the actual installation position of the range positioning unit, thereby eliminating the adverse effects of the processing and assembly accuracy of the touch screen and the optical imaging system on the coordinate accuracy of the touch surface, effectively limiting the actual coordinate accuracy of the touch surface to the installation position of the range positioning unit, eliminating unnecessary dimensional accuracy influence, and thus obtaining a touch positioning detector with higher positioning accuracy;

[0052] 2. The present invention provides a positioning photoelectric detector, a detection system, a touch screen, a detection method and an application. When the present invention is actually used, the position of the optical lens can be adaptively installed according to actual conditions such as the touch surface, because it only needs to determine that the range positioning unit is accurately installed and the installation position is highly accurate, thereby improving the applicability and fault tolerance of the present invention and improving the convenience of actual use;

[0053] 3. The present invention provides a positioning photoelectric detector, a detection system, a touch screen, a detection method and an application. The present invention has a high recognition accuracy and a small amount of processed data: the present invention only needs to read the light spot on the touch surface, and does not need to read all objects in the entire optical lens field of view. Therefore, the present invention has a high recognition accuracy and a small amount of processed data.

[0054] 4. The present invention positions the photoelectric detector, detection system, touch screen, detection method and application. The range positioning unit collects the light signal and transmits it to the information processing module, and then the information processing module activates the optical lens to take pictures, which can greatly reduce unnecessary image information. The picture is taken only when the range positioning unit is triggered, which reduces the amount of data processing, simplifies the processing architecture, and improves the processing efficiency. At the same time, the light performs rotation scanning, so that the various light spots on the touch surface will not appear on the same image, so there is no need to perform vertical comparison and judgment of which point is which preset coordinate point, which further reduces the amount of calculation of the present invention and improves the calculation efficiency of the present invention.

[0055] 5. The present invention positions the photoelectric detector, detection system, touch screen, detection method and application, and directly mounts the reflective prism used to form the rotating light scan on the main shaft of the motor, and the main shaft is set to be hollow to facilitate the passage of light, thereby obtaining a more compact rotating scanning type light scanning mechanism, making the light scanning mechanism an integrated component, miniaturized, and more convenient to install;

[0056] 6. The positioning photoelectric detector, detection system, touch screen, detection method and application of the present invention are set to at least two alternately rotating scanning light beams, so that the diffuse reflection angle is diverged, and the light returns to the receiving angle of the two photoelectric detectors, thereby improving the receiving effect of the present invention and further eliminating detection blind spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the proportional relationship of the various components in the drawings of this specification does not represent the proportional relationship in actual material selection and design, which is only a schematic diagram of the structure or position, wherein:

[0058] Figure 1 It is a schematic diagram of the structure of the present invention;

[0059] Figure 2 is a schematic diagram of the structure of the optical scanning mechanism;

[0060] Figure 3 is a schematic diagram of the structure of an optical imaging system;

[0061] Figure 4 It is a schematic diagram of the principle of the information processing module;

[0062] Figure 5 It is a schematic diagram of the angles of the light spots at points P1, P2 and P3 as seen by the objective lens of the optical lens on the plane where the touch surface is located;

[0063] Figure 6 It is the geometric diagram corresponding to the object plane and the phase plane.

[0064] Description of the reference numerals in the accompanying drawings:

[0065] 1-left photoelectric detector, 10-left optical scanning mechanism, 11-left optical imaging system, 12-left range positioning unit;

[0066] 2-right photoelectric detector, 20-right optical scanning mechanism, 21-right optical imaging system, 22-right range positioning unit;

[0067] 3- Indicator;

[0068] 4- flat panel display, 41- image pixel area;

[0069] 101 - light source, 102 - motor, 1021 - spindle, 1022 - rotor, 1023 - stator coil, 103 - reflective prism;

[0070] 110-optical lens, 111-filter, 112-image sensor;

[0071] 13-information processing module, 130-logic control and data processor, 131-preamplifier module, 133-light source control module, 134-motor control module, 137-storage module, 138-RF transceiver module, 139-peripheral device interface. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments.

[0073] Combine the following Figures 1 to 6 The present invention is described in detail.

[0074] Example 1

[0075] A touch positioning photoelectric detector, comprising an optical imaging system for collecting image information of a touch surface, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system;

[0076] The optical imaging system includes an optical lens for collecting light spots on the touch surface (ie, the image pixel area 41 of the touch surface of the flat display 4 is within the field of view of the optical lens) and an image sensor that receives information collected from the optical lens and sends it to the information processing module.

[0077] The range positioning unit can use a self-luminous lamp, such as an LED lamp; it can also use a device whose surface can reflect the light emitted by the light scanning mechanism, and the specific implementation is not limited. In the subsequent embodiments, the device whose surface can reflect the light emitted by the light scanning mechanism is used for explanation.

[0078] In the optical imaging system, the objective lens principal plane of the optical lens 110 and the light scanning plane of the light scanning mechanism are on the same detection plane; based on the approximate geometric plane characteristics of the detection plane, the optical imaging system measures the ray arc / angle of each light spot (P1, P2, P3) on the geometric plane, which is the objective lens principal point H.

[0079] When in use, the photoelectric detector designed by the present invention can be directly used, or one or more light spot detectors can be used in combination with other coordinate detection devices. In any touch device that needs to use an image for coordinate determination, the photoelectric detector can be installed to determine the coordinates of any point in the image pixel area. Specifically, the range positioning unit is installed at a preset coordinate point in the image pixel area of ​​the touch device, for example Figure 1 or other preset coordinate points that can be determined directly by the known equivalent dimensions such as the length and width of the image pixel area, such as Figure 1 At point P2 in .

[0080] The application of touch positioning photoelectric detection system in touch feedback system is described as follows:

[0081] Before coordinate detection, start the light scanning mechanism and the optical imaging system. The light scanning mechanism emits light to scan the touch surface and illuminate the range positioning unit. The range positioning unit reflects the light from the light scanning mechanism, thereby forming a point light spot at the range positioning unit. The optical lens sends the image information of the point light spot P1 formed at the range positioning unit to the image sensor. The image sensor performs photoelectric conversion on the information from the optical lens, thereby converting it into an electrical signal dot matrix. The dot matrix is ​​a unit circle with the origin (center of the circle) H′ (the origin H′ of the dot matrix corresponds to the principal point H of the objective lens), and the row and column dot matrix of the image sensor is the horizontal (x) and vertical (y) coordinate scales of the unit circle. Therefore, the P1 point light spot corresponds to P in the dot matrix. 1′ The information processing module reads the code of the dot pattern and obtains the light spot P 1′ The angle coordinates in the dot matrix are the light spot P 1′ is the reference coordinate.

[0082] Based on the triangulation positioning method, more than two photoelectric detectors are configured and installed at known positions. The coordinate value of the indicator on the touch surface in the dot matrix diagram can be obtained, and the coordinate value of the point where the indicator is located relative to the known point where the range positioning unit is installed can be obtained by processing the coordinate data using the triangulation positioning method, thereby completing the touch positioning.

[0083] The photoelectric detection designed by the present invention is based on installing a range positioning unit on a known coordinate point on the touch surface as a "reference point" to perform subsequent coordinate measurement of the indicator. In this way, not only can the range positioning unit select a small object to achieve light reflection and reduce the overall volume of image acquisition, but also the installation error can be reduced based on the small range positioning unit, thereby reducing the error between the actual installation position of the range positioning unit and the P1 point of the touch screen itself, thereby improving the installation accuracy; and no matter what the size of the touch screen actually manufactured is, what the size of the optical lens is, etc., the coordinates can be re-established based on the range positioning unit, which is not limited by the size of the touch screen, and is not affected by the assembly accuracy and processing accuracy. When it is actually used, it is only limited by the actual installation position of the range positioning unit, thereby eliminating the adverse effects of the processing and assembly accuracy of the touch screen and the optical lens on the coordinate accuracy of the touch surface, and effectively limiting the actual coordinate accuracy of the touch surface to only the installation position of the range positioning unit, eliminating unnecessary dimensional accuracy influence, so as to obtain a touch positioning detector with higher positioning accuracy.

[0084] When the present invention is actually used, the position of the optical lens can be adaptively installed according to actual conditions such as the touch surface, because it only needs to ensure that the range positioning unit is accurately installed and the installation position is highly accurate. This improves the applicability and fault tolerance of the present invention and improves the convenience of actual use.

[0085] At the same time, the present invention has high recognition accuracy and small amount of processed data: the present invention only needs to read the light spot on the touch surface, and there is no need to read all objects in the entire optical lens field of view, so it has high recognition accuracy and small amount of processed data.

[0086] Example 2

[0087] This embodiment further illustrates the specific implementation of Embodiment 1.

[0088] The optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner. The range positioning unit can collect the light pulse signal emitted by the optical scanning mechanism and send the collected signal to the information processing module.

[0089] The range positioning unit collects the light signal and transmits it to the information processing module, which then starts the optical imaging system to take pictures, which can greatly reduce unnecessary image information. Pictures are taken only when the range positioning unit is triggered, which reduces the amount of data processing, simplifies the processing architecture, and improves processing efficiency. At the same time, the light performs a rotational scan, so that the various light spots on the touch surface will not appear on the same image, so there is no need to make a vertical comparison judgment of which point is which preset coordinate point, which further reduces the amount of calculation of the present invention and improves the calculation efficiency of the present invention.

[0090] Furthermore, the optical scanning mechanism includes a light source 101, a motor 102 and a reflecting prism 103, the main shaft 1021 of the motor 102 is a hollow main shaft, the light source 101 is placed at one end of the main shaft 1021, and the reflecting prism 103 is installed at the other end of the main shaft 1021. The light beam emitted by the light source 101 passes through the inner hole of the main shaft 1021 and enters from the incident surface of the reflecting prism 103, and is emitted from the exit surface of the reflecting prism 103 to perform a scanning operation on the touch surface.

[0091] Furthermore, the light source of the optical scanning mechanism is a point light source or a line light source, specifically a laser.

[0092] The motor 102 drives the reflective prism 103 to rotate, and the light beam from the light source 101 is directed to the reflective prism 103. The reflected light beam forms a light scan with the endpoint O on the prism following the rotation of the prism; the light beam scans the plane of the image pixel area 41. In this example, the light source 101 is a laser diode, which is installed on the center line of the main shaft of the motor 102. The laser beam of the laser diode is directed to the reflective prism 103 through the hollow main shaft 1021. The reflective prism 103 is a right-angle prism installed on the main shaft of the rotor 1022, and the laser beam follows the rotation of the reflective prism to form a laser scan.

[0093] In the present invention, the reflective prism used to form the rotating light scan is directly mounted on the main shaft of the motor 102, and the main shaft is set to be hollow to facilitate the passage of light, thereby obtaining a more compact rotating scanning light scanning mechanism, making the light scanning mechanism an integrated component with a miniaturized size and more convenient installation.

[0094] Preferably, the lens combination of the optical lens is a fisheye lens.

[0095] The optical lens is a circular fisheye lens composed of multiple lenses, and its viewing angle is greater than 160°. The optical lens projects an object with a viewing angle greater than 160° onto its phase plane. The light pattern of the imaging surface is a circular (or elliptical) image. The optical lens in this example uses a fisheye lens with a viewing angle of 200°.

[0096] The present invention utilizes the property of the fisheye lens that objects on the same plane can be seen, and can integrate the lens and the display surface into one surface, thereby expanding the touch positioning surface and making it feasible to use an optical imaging system as a positioning detection for a touch screen, especially a large touch screen.

[0097] Furthermore, the range positioning unit is any one of the following photosensitive elements: a photoresistor, a photodiode, and a phototransistor.

[0098] Furthermore, the optical imaging system further comprises a filter arranged on the optical path between the optical lens and the image sensor. The filter 111 is installed at the bottom of the optical lens to filter out light waves other than the scanning beam and enter the image sensor 112 for photoelectric conversion.

[0099] The image sensor 112 is installed on the phase plane of the optical lens 110. The main plane of the optical lens 110, the filter 111, and the plane of the image sensor 112 are all perpendicular to the optical axis. In this example, the image sensor 112 is a CMOS image sensor.

[0100] Example 3

[0101] A general implementation of the information processing module is as follows:

[0102] The information processing module 13 includes a logic control and data processing unit 130, a preamplifier unit 131, a light source control module 133, a motor control module 134, a clock unit 135, a timer unit 136, a RAM cache unit 137, a radio frequency transceiver unit 138, and a peripheral device interface unit 139.

[0103] The logic control and data processing unit 130 is the control center of the information processing module 13. The clock unit 135 provides a timing clock and connects the logic control and data processing unit 130.

[0104] The logic control and data processing unit 130 is connected to the preamplifier unit 131, and the preamplifier 131 is connected to the left range positioning unit 12 or the right range positioning unit 22 (the left photoelectric detector is the left range positioning unit, and the right photoelectric detector is the right photoelectric detection unit);

[0105] The logic control and data processing unit 130 is connected to the light source control module 133 , and the motor control module 134 is connected to the light source 101 of the light emitter 10 ;

[0106] The logic control and data processing unit 130 is connected to the motor control module 134 , and the light source control module 133 is connected to the stator coil 1023 of the light transmitter 10 ;

[0107] The logic control and data processing unit 130 is connected to the timer unit 136 , and the clock unit 135 is connected to the timer unit 136 ;

[0108] The logic control and data processing unit 130 is connected to the image sensor 112 of the optical imaging system;

[0109] The logic control and data processing unit 130 is connected to the RAM cache unit 137;

[0110] The logic control and data processing unit 130 is connected to the radio frequency transceiver module 138;

[0111] The logic control and data processing unit 130 is connected to the peripheral device interface 139 .

[0112] In the present invention, the relevant control programs and electronic devices in the information processing module are all existing technologies and can be purchased on the market or directly obtained based on existing technologies.

[0113] Example 4

[0114] A touch positioning photoelectric detection system, comprising two groups of photoelectric detectors, the two groups of photoelectric detectors are respectively a left photoelectric detector and a right photoelectric detector, and the photoelectric detectors include an optical imaging system for collecting touch surface image information, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system;

[0115] The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to the information processing module;

[0116] And the information processing modules of the photoelectric detectors are all connected to the host signal.

[0117] Preferably, the line between the range positioning unit of the left photodetector and the range positioning unit of the right photodetector is parallel to the line between the objective lens center point of the optical lens of the left photodetector and the objective lens center point of the optical lens of the right photodetector.

[0118] Due to the installation environment of the prior art, the length and width of the display plane will be distorted in the projected image, such as trapezoidal distortion, so its accuracy is not high. However, the present invention adopts angle measurement, even if the object on the line segment is superimposed into a point, its angle will not change, and the accuracy of the angle depends on the image sensor component of the imaging. At present, the resolution of the image sensor component has reached 10 million pixels, so the measurement resolution of the present invention can be made very high.

[0119] Example 5

[0120] A touch screen, comprising a touch screen body and a positioning detection system for the touch screen body, wherein the positioning detection system comprises two groups of photoelectric detectors, the two groups of photoelectric detectors are respectively a left photoelectric detector and a right photoelectric detector, and the photoelectric detector comprises an optical imaging system for collecting image information of a touch surface, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system;

[0121] The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to the information processing module;

[0122] And the information processing modules of the photoelectric detectors are all connected to the host signal;

[0123] The fields of view of the optical lenses all include the touch surface, and the range positioning units of the two groups of photoelectric detectors are respectively located at two corners of one side of the touch screen body.

[0124] Furthermore, the connection line between the range positioning units is parallel to a side line of the touch screen body;

[0125] And the line between the range positioning unit of the left photodetector and the range positioning unit of the right photodetector is parallel to the line between the objective lens center point of the optical lens of the left photodetector and the objective lens center point of the optical lens of the right photodetector.

[0126] The present invention is about how to perform coordinate detection based on a photoelectric detector, as follows:

[0127] 1. Take two left photodetectors for illustration. The two left photodetectors are left photodetector and right left photodetector, and they are located at two corners of one side of the touch screen body, which are P1 and P2 respectively. The range positioning units are installed at Figure 1The distance between point P1 and point P2 can be obtained by manually inputting the pixel information of the touch surface into the information processing module, or the information processing module can be directly connected to the host and read from the host. For the convenience of subsequent description, in order to distinguish whether the same component belongs to the left photodetector or the right-left photodetector, the same component is distinguished by "left" and "right", "left" corresponds to the left photodetector, and "right" corresponds to the right-left photodetector. At the same time, in order to simplify the calculation, the line between the range positioning unit of the left photodetector and the range positioning unit of the right photodetector is parallel to the line between the objective lens center point of the optical lens of the left photodetector and the objective lens center point of the optical lens of the right photodetector, that is, the line between the objective lens principal points H in the two left photodetectors is parallel to P1P2. Multiple left photodetectors can share one information processing module, or each can use one left photodetector.

[0128] 2. Before coordinate detection, start the light scanning mechanism and the optical imaging system. The light scanning mechanism emits light to scan the touch surface and illuminate the range positioning unit. The range positioning unit reflects the light from the light scanning mechanism, thereby forming a light spot P1 at the range positioning unit; the optical lens sends the image information of the light spots P1 and P2 formed at the range positioning unit to the image sensor. The image sensor performs photoelectric conversion on the image information from the optical lens, thereby converting it into an electrical signal dot matrix. The left dot matrix in the left photodetector is a unit circle with the origin (center of the circle) H′ (the origin H′ of the left dot matrix corresponds to the left objective lens principal point H in the left photodetector), and the right dot matrix in the right photodetector is a unit circle with the origin (center of the circle) H1′ (the origin H1′ of the right dot matrix corresponds to the right objective lens principal point H1 in the right photodetector); the row and column dot matrix of the image sensor is the horizontal (x) and vertical (y) coordinate scales of the unit circle. Therefore, the P1 point light spot corresponds to P in the left dot matrix. 1′ Point light spot, P2 point light spot corresponds to P in the left dot matrix diagram 2′ Point light spot; the information processing module reads the code of the left dot matrix, and obtains the coordinate values ​​of the light spots P1' and P2' in the left dot matrix, and uses this light spot P1' as the reference coordinate of the subsequent indicator; correspondingly, the P1 point light spot corresponds to the P1" point light spot in the right dot matrix, and the P2 point light spot corresponds to the P2" point light spot in the right dot matrix; the information processing module reads the code of the right dot matrix, and obtains the coordinate values ​​of the light spots P1" and P2" in the right dot matrix. The details are as follows:

[0129] Figure 6 In the figure, the corresponding relationship between the image angle and the object angle is:

[0130] (π-∠P1′H′H1")=∠P1HH1,

[0131] (π-∠P3′H′H1")=∠P3HH1, ......

[0132] The left image sensor photoelectrically converts the image information into an electrical signal dot matrix. The left dot matrix is ​​a unit circle with the origin H' (center of the circle), and the row and column dot matrix of the image sensor is the horizontal (x) and vertical (y) coordinate scale of the unit circle. The information processing module reads the code of the dot matrix and queries the coordinate xy values ​​of the light spots P1', P2', and P3', and calculates the radians of the angles ∠P1HH1, ∠P3HH1, ... according to the above correspondence between the image angle and the object angle and the trigonometric function theorem.

[0133] Similarly, the right image sensor photoelectrically converts the image information of the phase plane into an electrical signal dot matrix. The right dot matrix is ​​a unit circle with H1" as the origin (center of the circle), and the row and column dot matrix of the image sensor is the horizontal (x) and vertical (y) coordinate scale of the unit circle. The information processing circuit reads the dot matrix code, and queries the coordinate xy values ​​of the light spots P1", P2", and P3", and calculates the radians of the angles ∠P1H1H, ∠P3H1H, ... according to the trigonometric function theorem.

[0134] Detect and calculate the radians of the corresponding angles ∠P1HH1, ∠P3HH1, ∠P2H1H, ∠P3H1H, etc. and the known P1P2 range equivalent, and calculate the coordinate value of the P3 point of the indicator 3 relative to the P1 point according to the triangulation positioning method, that is, the trigonometric function theorem: when there is an indicator 3 on the touch surface, the optical lens will capture the image information of the indicator 3 and generate dot matrix data on the image sensor and transmit the dot matrix data to the information processing module, and the information processing module uses the triangulation positioning method to process the image data from the image sensor to obtain the position of the indicator. After the position of the indicator 3 is obtained, the position information is sent to the host for subsequent processing.

[0135] Furthermore, the optical scanning mechanism emits a light beam that scans the touch surface in a rotating manner, and the optical scanning mechanisms of the two groups of photodetectors scan the touch surface in an alternating rotating manner.

[0136] The optical scanning mechanism can be a laser scanning mechanism that outputs a fixed straight line of light to cover the image pixel area 41 plane. However, the emission angle of the straight line of light is fixed, which not only leads to a large amount of data to be processed, but also causes a detection blind spot when the reflection angle of the diffuse reflection is not at the receiving angle of the two photodetectors that return, especially when the touch screen is larger than 120 inches, the blind spot is more obvious. Therefore, in the present invention, at least two scanning beams are set to rotate alternately, so that the diffuse reflection angle diverges, and the light returns to the receiving angle of the two photodetectors, thereby improving the receiving effect of the present invention and further eliminating the detection blind spot.

[0137] Example 6

[0138] Regarding the solution of the technical solution of the present invention in which the angle is detected based on the optical imaging system to locate the coordinates:

[0139] 1. The objective lens of the optical lens used in the present invention is a fisheye lens, which has the properties of a convex lens. The reflected light generated by the object in the lens field of view will enter the main plane of the convex lens. Then, when the center of the optical axis of the main plane of the lens is taken as the origin, the angle of the line segment from the origin to the reflected light point of the object is the only constant, and on the line segment with the same angle, no matter how many light points there are, they will only be superimposed into one light point and then appear at a certain position on the main plane of the lens. As shown in the technical solution Figure 6 The HP3 line segment, the light spot P3 moves on this line segment, and the angle of the light spot does not change. Therefore, the lens principal plane only knows the angle of the light spot, but does not know how far the light spot is from it. Using this characteristic of the lens, because two angles need to be measured based on the triangulation positioning method, this method needs to use two positioning points to measure the angle, and in the present invention, two optical imaging systems are used, and the optical imaging systems are respectively installed at the left and right points, namely, point P1 and point P2.

[0140] 2. In the optical imaging system, the object and the image have a point-to-point, line-to-line conjugate relationship. Therefore, the light pattern on the principal plane of the objective lens and the image pattern on the phase plane are in a scaling relationship, and the similar angles corresponding to the object and the image are equal.

[0141] Therefore, the angle of the object light spot measured in the lens is converted to a similar angle measured in the phase plane.

[0142] 3. The image sensor is a regularly arranged array of photosensitive elements in rows and columns. The sensing surface of the image sensor is installed on the phase plane of the lens, which converts the light pattern into an electronic dot pattern. The method regards the sensing surface of the image sensor as a unit circle with the center line of the lens optical axis as the origin, and the physical points of the photosensitive elements arranged in rows and columns are the x and y scales on the coordinate axis of the unit circle. Then the logic circuit reads the electronic dot pattern, finds the coordinate values ​​x and y of the moving indicator P3 light spot in the image, and calculates the angle according to the trigonometric function theorem.

[0143] 4. The image sensor can convert all visible light entering the lens into an electronic dot pattern. Therefore, in order to distinguish the image of visible light, the method uses laser to illuminate the moving object so that the generated light spots can be distinguished from other light and quickly found, thereby improving the recognition accuracy while reducing the amount of data processing.

[0144] In summary, the present invention locates the coordinates of the indicator 3 based on the trigonometric function theorem. Specifically, Figure 5 The principal points H and H1 of the two optical lenses and the indicator P3 (such as a finger) form a triangle, as shown in Figure 6As shown. P1P2 is a known constant - the driver resolution of the display is a hardware attribute, which is fixed and unchanged. The resolution parameters of the display can be read through the communication protocol (even if it cannot be read, it can be set manually). Therefore, based on the trigonometric function theorem, the side length HH1 of the triangle can be obtained according to the known P1P2. This length and width resolution is the equivalent of the side length of the triangle. The present invention has nothing to do with the actual physical size of the display, because the resolution equivalent has no necessary relationship with the actual physical size of the display. Because of this, the present invention is applicable to all displays.

[0145] When touching, because the indicator 3 keeps moving, the angles of the three corners of the triangle formed by the indicator and the principal point of the objective lens are constantly changing. Therefore, the two optical imaging systems continuously detect the instantaneous angles of two of the angles of the triangle. Based on the trigonometric theorem, the angles at both ends of the side length HH1 are calculated to be known quantities, and the coordinates of the point P3 where the indicator 3 is located are determined by the triangulation positioning method.

[0146] The touch positioning detection method includes the following steps:

[0147] S1, photodetector initialization:

[0148] ① Initialization of the storage unit of the information processing module;

[0149] ② Initialization of the signal receiving and sending ports of the information processing module;

[0150] ③ Initialization of the peripheral device interface of the information processing module;

[0151] ④ The information processing module collects the range equivalent of the edge of the touch screen where two range positioning units are set;

[0152] ⑤Other system initialization: The logic control and data processing of this example communicates with the host through the peripheral device interface, and automatically reads the current host display driver pixel resolution value and caches it in the RAM cache module / storage module; for example: if the resolution is 1920 (length) * 1080 (width) pixels, the length and width equivalent of the image pixel area 41 is 1920 pixels long and 1080 pixels wide, P1P2 = 1920 pixels; the P1P2 range equivalent can also be manually entered;

[0153] S2, the optical scanning mechanism is started, the range positioning unit reflects the light of the optical scanning mechanism, and the light spot formed by the reflection of the range positioning unit in the left photoelectric detector is the P1 point light spot, and the light spot formed by the reflection of the range positioning unit in the right photoelectric detector is the P2 point light spot;

[0154] S3, the optical imaging systems of the photoelectric detectors are all started to perform exposure photography: the optical imaging system captures the angle information of the light spot at the range positioning unit, and sends the angle information to the information processing module;

[0155] S4, the information processing module reads the angle information obtained in S3, and determines the coordinates of the point P1 and the point P2 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation method;

[0156] S5. When in use, the touch point on the touch screen is point P3, the light of the light scanning mechanism reflected by point P3 forms a light spot at point P3, the optical imaging system captures the angle information of the light spot at the touch point, and sends the angle information to the information processing module;

[0157] S6, the information processing module determines the coordinate value of point P3 relative to point P1 according to the triangulation positioning method;

[0158] The information processing module automatically compares the coordinate value of point P3 relative to P1 with the limit coordinate value of point P1 on the touch surface, and determines whether the coordinate value of P3 is within the range of the pixel area of ​​the touch surface. If it is, it is a valid value and is sent to the host. Otherwise, the data is discarded.

[0159] S7, the information processing module sends the coordinate value of point P3 relative to point P1 to the host;

[0160] S8. Repeat steps S5 to S7 to track the movement trajectory of the touch point.

[0161] Further, the optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner;

[0162] In S3, when the range positioning unit in the left photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P1 captured by the optical imaging system, and the image information is sent to the information processing module; when the range positioning unit in the right photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P2 captured by the optical imaging system, and the image information is sent to the information processing module;

[0163] In S4, the information processing module reads the image information of the light spot including the point P1 obtained in S3, and determines the coordinates of the point P1 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation positioning method, that is, determines the arc ∠P1′H′H1", ∠P1′H1"H′ of the light spot of the point P1 on the two image sensors, that is, the point P1′ on the photo; the logic control and data processor calculates:

[0164] ∠P1HH1=π-∠P1′H′H1"

[0165] ∠P1H1H=π-∠P1′H1′H"

[0166] Cache the radian values ​​of ∠P1HH1 and ∠P1H1H in the RAM cache module of the logic control and data processor; the logic control and data processor calculates the coordinates of point P1 relative to point H and point H1;

[0167] The information processing module reads the image information of the light spot including point P2 obtained in S3, and determines the coordinates of point P2 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation positioning method, and the calculation method thereof refers to the above-mentioned point P1.

[0168] Because the principal plane of the objective lens of the left optical lens, the principal plane of the objective lens of the right optical lens, the beam scanning surface of the left optical scanning mechanism, and the beam scanning surface of the right optical scanning mechanism are on the same detection surface. From the perspective of the objective lens, on a line segment, light spots of the same angle will overlap. Therefore, only similar angles of light spots on the same line segment can be displayed on the phase plane of the lens, but similar proportional lengths of the line segments cannot be displayed.

[0169] In this method, the function of the left optical lens and the right optical lens is to detect the angle of the line segment where the light spot is located (relative to the origin). The CMOS image sensor installed on the phase plane is a photoelectric dot matrix with regular rows and columns. Taking the optical axis of the objective lens as the origin, the row and column dot matrix of the CMOS image sensor is the x and y coordinate scale on the unit circle. When the light spot on the object plane is exposed as an image by the CMOS image sensor, the logic processor reads the x and y scale values ​​relative to the origin of the optical axis on the image, and the angle of the similar angle corresponding to the object image can be calculated based on trigonometric functions.

[0170] Figure 6 It is the geometric correspondence between the object in the optical lens perspective and the image in the phase plane. Figure 6 middle:

[0171] P1, P2, and P3 are light points on the object plane;

[0172] P 1′ , P 2′ , P 3′ The object plane light points P1, P2, and P3 correspond to the phase plane light points in the left optical imaging system in sequence;

[0173] P 1" , P 2" , P 3" The object plane light points P1, P2, and P3 correspond to the phase plane light points in the right optical imaging system.

[0174] The length of P1P2 is known. According to the triangulation positioning method, that is, the trigonometric function theorem, the instantaneous coordinates of the indicator P3 are calculated. One of the calculations is as follows:

[0175] ⑴Calculate HO1

[0176] From similar triangles we can get

[0177]

[0178] ∴vertical spacing HO1=P1O1×tan∠HP1O1

[0179]

[0180] ⑵Calculate O1P2

[0181] From the similarity of triangles, we can get

[0182]

[0183]

[0184] Substituting into formula ①, we get

[0185]

[0186] ⑶Calculate P1O1

[0187] ∴The relationship between P1O1 and P1P2 is

[0188] P1O1+O1P2=P1P2

[0189] Substituting into formula ②, we get

[0190]

[0191] Right now:

[0192] ⑷Calculate O2P2

[0193] ∵HO1=H1O2

[0194] According to the triangle similarity principle,

[0195]

[0196]

[0197] ⑸Calculate O1O2

[0198] ∴O1O2=HH1=O1P2﹣O2P2

[0199] Substituting into equations ② and ③, we get

[0200]

[0201] ⑹Calculate HH1

[0202] According to the triangle similarity principle,

[0203]

[0204]

[0205] In △H1HP3

[0206]

[0207] ⑺ Calculate the ordinate OP3 of the indicator P3 in the image pixel area 41

[0208]

[0209] Substituting into equations ① and ④, we get OP3

[0210]

[0211] ⑻ Calculate the horizontal coordinate P10 of the indicator P3 in the image pixel area 41

[0212]

[0213] Based on the algorithm shown above, the coordinates of the point P3 where the indicator 3 is located can be obtained. After obtaining the coordinates, the information processing module sends them to the host.

[0214] In this embodiment, the model of the logic control and data processor is preferably: VerilogHDL hardware description language is used to design an FPGA device (CycloneIV_EP4E6).

[0215] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Touch positioning photoelectric detector, characterized in that: It includes an optical imaging system for collecting image information of the touch surface, a light scanning mechanism capable of emitting light to scan the touch surface, a range positioning unit capable of forming a light spot, and an information processing module that receives information collected from the optical imaging system and controls the working state of the optical imaging system; The optical imaging system includes an optical lens for collecting light spots on the touch surface and an image sensor that receives information collected by the optical lens and sends it to the information processing module; The range positioning unit reflects the light of the light scanning mechanism, and the light spot formed by the reflection of the range positioning unit in the left photodetector is the P1 point light spot, and the light spot formed by the reflection of the range positioning unit in the right photodetector is the P2 point light spot; the optical imaging systems of the photodetectors are all started to perform exposure and photography: the optical imaging system captures the angle information of the light spot at the range positioning unit, and sends the angle information to the information processing module; The information processing module reads the angle information obtained in S3, and determines the coordinates of the points P1 and P2 relative to the principal point of the objective lens of the optical lens of the left / right photodetector according to the triangulation method; when in use, the touch point on the touch screen is the point P3, the light of the light scanning mechanism reflected by the point P3 forms a light spot at the point P3, the optical imaging system captures the angle information of the light spot at the touch point, and sends the angle information to the information processing module; The information processing module determines the coordinate value of point P3 relative to point P1 according to the triangulation positioning method; the information processing module sends the coordinate value of point P3 relative to point P1 to the host.

2. The touch location photoelectric detector according to claim 1, characterized in that: The optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner. The range positioning unit can collect the light pulse signal emitted by the optical scanning mechanism and send the collected signal to the information processing module.

3. The touch location photoelectric detector according to claim 2, characterized in that: The optical scanning mechanism comprises a light source (101), a motor (102) and a reflective prism (103); the main shaft (1021) of the motor (102) is a hollow main shaft; the light source (101) is disposed at one end of the main shaft (1021); the reflective prism (103) is mounted at the other end of the main shaft (1021); a light beam emitted by the light source (101) passes through an inner hole of the main shaft (1021) and then enters from an incident surface of the reflective prism (103), and is then emitted from an exit surface of the reflective prism (103) to perform a scanning operation on a touch surface.

4. The touch location photoelectric detector according to claim 1, characterized in that: The lens combination of the optical lens is a fisheye lens.

5. The touch location photoelectric detector according to claim 1, characterized in that: The optical imaging system further comprises a filter arranged on the optical path between the optical lens and the image sensor.

6. The touch positioning photoelectric detector according to any one of claims 1 to 5, characterized in that: The light source of the optical scanning mechanism is a point light source or a line light source.

7. Touch positioning photoelectric detection system, characterized by: The invention comprises two groups of touch positioning photodetectors, which are respectively a left touch positioning photodetector and a right touch positioning photodetector, and the touch positioning photodetectors are all the touch positioning photodetectors according to any one of claims 1 to 6, and the information processing modules of the touch positioning photodetectors are all connected to the host signal.

8. The touch positioning photoelectric detection system according to claim 7, characterized in that: The light scanning mechanism emits a light beam that scans the touch surface in a rotational manner, and the light scanning mechanisms of the two groups of touch positioning photodetectors scan the touch surface in an alternating rotational manner.

9. A touch screen, comprising a touch screen body and a positioning detection system for the touch screen body, characterized in that: The positioning detection system is a touch positioning photoelectric detection system according to any one of claims 7 to 8, the field of view of the optical lens includes the touch surface, and the range positioning units of the two groups of touch positioning photoelectric detectors are respectively located at two corners of one side of the touch screen body.

10. A touch screen according to claim 9, characterized in that: The connecting line between the range positioning units is parallel to a side line of the touch screen body; And the line between the range positioning unit of the left touch positioning photodetector and the range positioning unit of the right touch positioning photodetector is parallel to the line between the objective lens center point of the optical lens of the left touch positioning photodetector and the objective lens center point of the optical lens of the right touch positioning photodetector.

11. A method for detecting touch positioning, characterized in that: The touch positioning photoelectric detection system according to claim 7 or 8 is included, and when the touch positioning photoelectric detection system is used for detection, the following steps are included: S1, touch positioning photoelectric detector initialization; S2, the light scanning mechanism is started, the range positioning unit reflects the light of the light scanning mechanism, and the light spot formed by the reflection of the range positioning unit in the left touch positioning photoelectric detector is the P1 point light spot, and the light spot formed by the reflection of the range positioning unit in the right touch positioning photoelectric detector is the P2 point light spot; S3, the optical imaging systems of the touch positioning photoelectric detector are all started to perform exposure photography: the optical imaging system captures the angle information of the light spot at the range positioning unit, and sends the angle information to the information processing module; S4, the information processing module reads the angle information obtained in S3, and determines the coordinates of the point P1 and the point P2 relative to the principal point of the objective lens of the optical lens of the left / right touch positioning photodetector according to the triangulation positioning method; S5. When in use, the touch point on the touch screen is point P3, the light of the light scanning mechanism reflected by point P3 forms a light spot at point P3, the optical imaging system captures the angle information of the light spot at the touch point, and sends the angle information to the information processing module; S6, the information processing module determines the coordinate value of point P3 relative to point P1 according to the triangulation positioning method; S7, the information processing module sends the coordinate value of point P3 relative to point P1 to the host; S8. Repeat steps S5 to S7 to track the movement trajectory of the touch point.

12. The touch positioning detection method according to claim 11, characterized in that: The optical scanning mechanism emits a light beam that scans the touch surface in a rotational manner; In S3, when the range positioning unit in the left touch positioning photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P1 captured by the optical imaging system, and the image information is sent to the information processing module; when the range positioning unit in the right touch positioning photodetector receives the light beam emitted from the light scanning mechanism, it sends this information to the information processing module, and the information processing module starts the optical imaging system to perform exposure photography: the image information of the light spot at point P2 captured by the optical imaging system, and the image information is sent to the information processing module; In S4, the information processing module reads the image information of the light spot including the point P1 obtained in S3, and determines the coordinates of the point P1 relative to the principal point of the objective lens of the optical lens of the left / right touch positioning photodetector according to the triangulation positioning method; The information processing module reads the image information of the light spot including the point P2 obtained in S3, and determines the coordinates of the point P2 relative to the principal point of the objective lens of the optical lens of the left / right touch positioning photodetector according to the triangulation positioning method.

13. A method, characterized in that Application of a touch positioning photoelectric detection system according to any one of claims 7 to 8 in a touch feedback system.

Images