Infrared touch device and infrared touch screen

Abstract

The embodiment of the invention discloses an infrared touch device and an infrared touch screen, the infrared touch device comprises an infrared touch unit and a light-transmitting film, the infrared touch unit comprises a plurality of infrared emitters and a plurality of infrared receivers, infrared light columns are formed between the infrared emitters and the corresponding infrared receivers, and the infrared light columns are arranged on the light-transmitting film. An optical network formed by the infrared light columns is used for covering the upper part of a touch surface; a light-transmitting film is arranged in the transmitting direction of at least one infrared transmitter and / or the receiving direction of at least one infrared receiver, the light-transmitting film located in the transmitting direction is used for scattering infrared light transmitted by the infrared transmitter, and the light-transmitting film located in the receiving direction is used for scattering infrared light received by the infrared receiver. By adopting the method, the technical problem that large holes exist in an optical network formed by infrared light columns and are not beneficial to touch detection and positioning can be solved.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of infrared touch technology, and in particular, to an infrared touch device and an infrared touch screen. Background Art

[0002] With the development of touch technology, various touch screens have emerged in people's daily lives. Among them, a touch screen can be understood as a display screen with a touch function, and it can also be called a touch panel, a touch screen, etc. An infrared touch screen is a common touch screen. The principle of an infrared touch screen is as follows: A plurality of infrared emitters and a plurality of infrared receivers are symmetrically arranged around the screen. After the infrared light emitted by the infrared emitters is received by the infrared receivers, an infrared light column can be formed between the infrared emitters and the infrared receivers, and the light network composed of each infrared light column covers the surface of the infrared touch screen. When the infrared touch screen receives a touch operation, the touch operation will block the infrared light column, and then the intensity of the infrared light received by the infrared receiver will change. According to the change in the intensity of the infrared light received by each infrared receiver, the touch position of the touch operation can be determined.

[0003] In some technologies, due to the limitation of the chip size in the infrared emitter and the infrared receiver, the width of the infrared light column is generally less than 2 mm. At this time, there are relatively large holes in the light network formed by each infrared light column, which is not conducive to the detection and positioning of touch operations. Summary of the Invention

[0004] Embodiments of the present application provide an infrared touch device and an infrared touch screen to solve the technical problem that there are relatively large holes in the light network formed by infrared light columns in some technologies, which is not conducive to touch detection and positioning.

[0005] In a first aspect, an embodiment of the present application provides an infrared touch device, including: an infrared touch unit and a light-transmitting film.

[0006] The infrared touch unit includes a plurality of infrared emitters and a plurality of infrared receivers. An infrared light column is formed between the infrared emitter and the corresponding infrared receiver, and the light network formed by each infrared light column is used to cover above the touch surface.

[0007] A light-transmitting film is arranged in at least one emission direction of the infrared emitter and / or at least one reception direction of the infrared receiver. The light-transmitting film located in the emission direction is used to scatter the infrared light emitted by the corresponding infrared emitter, and the light-transmitting film located in the reception direction is used to scatter the infrared light received by the corresponding infrared receiver.

[0008] In an embodiment of the present application, the light-transmitting film includes a first light-transmitting film, and the first light-transmitting film is composed of a first dielectric part and a second dielectric part, and the refractive index of the first dielectric part is greater than that of the second dielectric part.

[0009] In an embodiment of the present application, the first contact surface of the first medium portion contacts the second contact surface of the second medium portion, and a plurality of bosses are arranged at intervals on the first contact surface, and grooves corresponding to the bosses are arranged on the second contact surface.

[0010] In an embodiment of the present application, the infrared light column is composed of a plurality of infrared rays. When the plurality of infrared rays enter the first light-transmitting film from the surface of the first medium portion facing away from the second medium portion, the side surface of the boss is used for total reflection of the infrared rays with an incident angle greater than or equal to the critical angle.

[0011] In an embodiment of the present application, the infrared light column is composed of a plurality of infrared rays. When the plurality of infrared rays enter the first light-transmitting film from the surface of the second medium portion facing away from the first medium portion, the side surface of the boss is used for refracting the infrared rays entering the first medium portion.

[0012] In an embodiment of the present application, the angle between the side surface of the boss and the bottom surface of the boss is an acute angle, and the angle is determined according to the expected width after the infrared light column is scattered.

[0013] In an embodiment of the present application, the light-transmitting film includes a second light-transmitting film. One surface of the second light-transmitting film is a non-smooth surface, and the non-smooth surface is used for changing the propagation angle of infrared light. The infrared light enters the second light-transmitting film from the non-smooth surface or the infrared light enters the second light-transmitting film from the surface of the second light-transmitting film facing away from the non-smooth surface.

[0014] In an embodiment of the present application, the non-smooth surface includes a plurality of semi-cylindrical curved surfaces, or the non-smooth surface is a wire-drawing surface formed after wire-drawing in the same direction.

[0015] In an embodiment of the present application, the light-transmitting film further includes: a third light-transmitting film, and the third light-transmitting film is disposed on the side of the second light-transmitting film facing away from the non-smooth surface, and the third light-transmitting film is used for supporting the second light-transmitting film.

[0016] In an embodiment of the present application, the infrared touch device further includes: a plastic layer, and the plastic layer is disposed on the side of the light-transmitting film where infrared light is incident. The surface of the plastic layer facing away from the light-transmitting film is a low-roughness surface, and the low-roughness surface meets a set roughness range.

[0017] In one embodiment of the present application, the infrared touch unit further includes a first frame body and a second frame body. The first frame body is provided with the infrared emitter, and the second frame body is provided with the infrared receiver. The first frame body is further provided with a light-transmitting film in the emission direction and / or the second frame body is further provided with a light-transmitting film in the receiving direction.

[0018] In one embodiment of the present application, the first frame body is provided with a first fixing groove for fixing the light-transmitting film in the emission direction; and / or,

[0019] the second frame body is provided with a second fixing groove for fixing the light-transmitting film in the receiving direction.

[0020] In one embodiment of the present application, the infrared touch device further includes a filter strip. The light-transmitting film corresponding to the infrared emitter is located between the infrared emitter and the corresponding filter strip and / or the light-transmitting film corresponding to the infrared receiver is located between the infrared receiver and the corresponding filter strip. Alternatively, a corresponding filter strip is provided between the light-transmitting film corresponding to the infrared emitter and the infrared emitter and / or a corresponding filter strip is provided between the light-transmitting film corresponding to the infrared receiver and the infrared receiver.

[0021] In one embodiment of the present application, both the first frame body and the second frame body are provided with a third fixing groove for fixing the filter strip.

[0022] In one embodiment of the present application, the light-transmitting film is adhered to the filter strip.

[0023] In a second aspect, one embodiment of the present application further provides an infrared touch screen, including a display screen with a touch surface and the infrared touch device as described in the first aspect.

[0024] In one embodiment of the present application, by arranging a light-transmitting film for scattering infrared light in the emission direction of at least one infrared emitter and / or arranging a light-transmitting film for scattering infrared light in the receiving direction of at least one infrared receiver, the width of the infrared light column formed between the infrared emitter and the infrared receiver can be increased, and thus the holes in the light grid composed of the infrared light columns can be made smaller, solving the technical problem that larger holes are not conducive to touch detection and positioning, improving the accuracy of touch detection and positioning. For example, a finer touch pen tip can be detected and recognized. Moreover, there is no need to change the existing hardware structure and size of the infrared emitter and the infrared receiver, and the increase in hardware cost is also avoided. At the same time, there is no need to additionally increase the number of infrared emitters and infrared receivers. And as the width of the infrared light column increases, the number of infrared emitters and infrared receivers can be appropriately reduced, further saving hardware costs and reducing the scanning period of infrared light, thereby improving the detection speed of touch operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the distribution of infrared emitters and infrared receivers in the related art;

[0026] Figure 2 is a schematic diagram of an infrared light column in the related art;

[0027] Figure 3 is a schematic structural diagram of an infrared touch device provided in one embodiment of the present application;

[0028] Figure 4 is a schematic side cross-sectional structure diagram of an infrared touch unit provided in one embodiment of the present application;

[0029] Figure 5 is another schematic side cross-sectional structure diagram of an infrared touch unit provided in one embodiment of the present application;

[0030] Figure 6 is still another schematic side cross-sectional structure diagram of an infrared touch unit provided in one embodiment of the present application;

[0031] Figure 7 is a schematic diagram of an infrared light column provided in one embodiment of the present application;

[0032] Figure 8 is another schematic diagram of an infrared light column provided in one embodiment of the present application;

[0033] Figure 9 is still another schematic diagram of an infrared light column provided in one embodiment of the present application;

[0034] Figure 10 is a schematic cross-sectional diagram of a light-transmitting film provided in one embodiment of the present application;

[0035] Figure 11 Schematic diagram of infrared light propagation provided by an embodiment of the present application;

[0036] Figure 12 Another schematic diagram of infrared light propagation provided by an embodiment of the present application;

[0037] Figure 13 Schematic diagram of a light-transmitting film provided by an embodiment of the present application;

[0038] Figure 14 Another schematic diagram of infrared light propagation provided by an embodiment of the present application;

[0039] Figure 15 Another schematic diagram of a light-transmitting film provided by an embodiment of the present application;

[0040] Figure 16 Schematic diagram of a drawn surface provided by an embodiment of the present application;

[0041] Figure 17 Another schematic diagram of infrared light propagation provided by an embodiment of the present application;

[0042] Figure 18 For Figure 13 Schematic diagram of the structure after adding a third light-transmitting film to the shown light-transmitting film;

[0043] Figure 19 For Figure 15 Schematic diagram of the structure after adding a third light-transmitting film to the shown light-transmitting film;

[0044] Figure 20 Schematic diagram of the positional relationship between a plastic layer and a light-transmitting film provided by an embodiment of the present application;

[0045] Figure 21 Schematic diagram of the structure of an infrared touch screen provided by an embodiment of the present application. Detailed implementation manners

[0046] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the sake of description, only parts related to the present application are shown in the drawings, rather than all structures.

[0047] In an infrared touch screen, an infrared emitter and an infrared receiver are the main devices for realizing infrared touch. Generally, the infrared emitter and the infrared receiver are symmetrically arranged around the display screen. For example, Figure 1 Schematic diagram of the distribution of the infrared emitter and the infrared receiver in the related art. Refer to Figure 1, the infrared emitter 11 and the infrared receiver 12 are respectively located on two adjacent sides of the display screen and are symmetrically arranged. The infrared emitter 11 and the infrared receiver 12 can form an infrared touch frame and are installed on the periphery of the display screen.

[0048] The infrared emitter 11 can be a device that can emit infrared light such as an infrared emission lamp (which can also be denoted as an infrared emission tube). The infrared emitter 11 includes a diode that can emit infrared radiation and emits infrared light through this diode. The infrared receiver 12 can be a device that can receive infrared light such as an infrared receiving lamp (which can also be denoted as an infrared receiving tube). Similar to the infrared emitter, the infrared receiver 12 also includes a diode that can receive infrared radiation (such as a photodiode) and receives infrared light through this diode.

[0049] In the field of infrared touch control, the infrared light emitted by the infrared emitter 11 can be received by the infrared receiver 12. After the infrared emitters 11 and the infrared receivers 12 cooperate, infrared light can be scanned on the screen surface at a certain frequency, and then the detection and positioning of touch operations can be performed based on the scanning results. At this time, an infrared light column is generated between the infrared emitter 11 and the infrared receiver 12 that receives the infrared light corresponding to it. For example, Figure 2 is a schematic diagram of an infrared light column in the related art. Refer to Figure 2 , an infrared light column 13 with a certain width is formed between the infrared emitter 11 and the infrared receiver 12. At this time, the infrared emitter 11 and the infrared receiver 12 can be considered as a pair of infrared tubes.

[0050] The infrared light emitted by the infrared emitter 11 can be received by multiple infrared receivers 12. Taking Figure 1 as an example, the infrared light emitted by the infrared emitter 11 located at the edge can be received by two infrared receivers 12, and the infrared light emitted by the remaining infrared emitters 11 can be received by three infrared receivers 12.

[0051] The infrared receiver 12 can receive the infrared light emitted by multiple infrared emitters 11. Taking Figure 1 as an example, the infrared receiver 12 located at the edge can receive the infrared light emitted by two infrared emitters 11, and the remaining infrared receivers 12 can receive the infrared light emitted by three infrared emitters 11.

[0052] Each infrared light column generated between each infrared emitter 11 and each infrared receiver 12 forms an infrared light network covering the surface of the screen. When a user touches the screen with a finger or a stylus (which can also be referred to as a touch pen, a writing pen, etc.), the finger or the stylus will block the infrared light column it touches. At this time, according to the blocking situation of the infrared light column, the touch operation can be detected and the position of the touch operation can be located, so as to realize the touch function of the infrared touch screen. It should be noted that after the infrared light column is blocked, the light energy of the infrared light received by the infrared receiver 12 will be weakened. When the weakening amount of the light energy reaches the set weakening amount threshold (i.e., the minimum weakening amount of the light energy caused by the touch operation), or when the weakening rate reaches other preset conditions, it can be determined that the corresponding infrared light column is blocked, and then the touch operation can be detected according to the blocking situation and the position of the touch operation can be located.

[0053] It can be understood that the process of each emission and reception of infrared light can be regarded as a scanning process. After scanning at a certain frequency, the detection and positioning of touch operations can be realized.

[0054] The wafer in the infrared emitter 11 is one of the core components of the infrared emitter 11. The wafer can also be understood as a light source that emits light. The brightness and electrical properties of the infrared emitter mainly depend on the wafer. Similarly, the wafer for receiving infrared light is also configured in the infrared receiver 12. The infrared light column between the infrared emitter 11 and the infrared receiver 12 is limited by the size of the wafer, and the width is usually less than 2 mm. This makes the gap between the infrared light columns in the infrared light network larger, that is, the holes 14 in the infrared light network are larger. Since no infrared light column passes through these holes, the touch operations located in the holes cannot be detected, which affects the detection and positioning accuracy of the touch operation.

[0055] In order to avoid the influence of the holes on the detection and positioning accuracy of the touch operation, the size of the wafer can be increased, and then the width of the infrared light column can be increased. However, after increasing the size of the wafer, the sizes of the infrared emitter 11 and the infrared receiver 12 also need to be increased, which greatly increases the hardware cost of the device. In addition, the number of the infrared emitter 11 and the infrared receiver 12 can also be increased to fill the holes in the infrared light network by increasing the number of infrared light columns. This not only increases the hardware cost, but also makes the scanning period of the infrared light longer, affecting the detection speed of the touch operation.

[0056] Based on this, in the embodiments of the present application, an infrared touch device and an infrared touch screen are provided, which can expand the width of the infrared light column without changing the size of the wafer, so as to reduce the holes in the infrared light network, and there is no need to increase the infrared emitter and the infrared receiver, ensuring the detection speed and accuracy of the touch operation.

[0057] An infrared touch device is provided in an embodiment of the present application. Figure 3The structural schematic diagram of an infrared touch device provided by an embodiment of the present application is referred to Figure 3 , the infrared touch device 20 includes: an infrared touch unit 21 and a light-transmitting film 22. The infrared touch unit 21 includes a plurality of infrared transmitters 11 and a plurality of infrared receivers 12. An infrared light column is formed between the infrared transmitter 11 and the corresponding infrared receiver 12. The light network formed by each infrared light column is used to cover above the touch surface; a light-transmitting film 22 is arranged in the emission direction of at least one infrared transmitter 11 and / or the reception direction of at least one infrared receiver 12. The light-transmitting film 22 located in the emission direction is used to scatter the infrared light emitted by the corresponding infrared transmitter 11, and the light-transmitting film 22 located in the reception direction is used to scatter the infrared light received by the corresponding infrared receiver 12.

[0058] Exemplarily, the infrared touch device 20 refers to a device that detects touch operations by infrared touch. Currently, the infrared touch device 20 includes an infrared touch unit 21 and a light-transmitting film 22.

[0059] The infrared touch unit 21 is used to generate the infrared light columns required for detecting touch operations. The infrared touch unit 21 includes a plurality of infrared transmitters 11 and a plurality of infrared receivers 12. Both the infrared transmitter 11 and the infrared receiver 12 can adopt existing infrared transmitters 11 and infrared receivers 12 without additional improvement. The infrared transmitter 11 and the infrared receiver 12 can adopt existing arrangement methods (such as Figure 3 the arrangement method in Figure 1 is the same as the arrangement method in

[0060] ). The embodiment will not make additional explanations for this. The infrared transmitters 11 and the infrared receivers 12 are symmetrically arranged around the touch surface. Herein, the touch surface can be understood as the surface that the user touches when performing a touch operation. For example, when the user performs a touch operation on the display screen, the surface of the screen in the display screen can be considered as the touch surface. At this time, the infrared touch unit 21 can be considered as a touch control frame located around the touch surface.

[0061] The infrared light emitted by the infrared transmitter 11 can be received by the infrared receiver 12. At this time, the infrared light columns generated between the infrared transmitter 11 and the infrared receiver 12 form an infrared light network (also called a light network) covering above the touch surface. It should be noted that there is a certain distance between the infrared light network and the touch surface, that is, when the user touches the touch surface (such as the surface of the display screen), the infrared light network will be contacted first, and then the touch surface will be contacted.

[0062] In one embodiment, the infrared touch unit 21 may further include a touch chip (not shown in the figure). Here, the chip, namely the IC, generally undertakes the functions of operation and storage. The touch chip is used to control the infrared emitter and the infrared receiver, and is also used to collect and process the received infrared light. Optionally, the touch chip can also determine the touch position of the touch operation when detecting the touch operation. Or, the touch chip communicates with the processor built in the device where the infrared touch unit is installed to report the detection result of the infrared light to the processor, so that the processor determines the touch position of the touch operation based on the detection result. Here, the device where the infrared touch unit is installed can be understood as a display device using infrared touch control.

[0063] In one embodiment, the infrared touch unit 21 further includes: a first frame body 210 and a second frame body 211. The first frame body 210 is installed with an infrared emitter 11, and the second frame body 211 is installed with an infrared receiver 12. The first frame body 210 is further installed with a light-transmitting film 22 in the emission direction and / or the second frame body 211 is further installed with a light-transmitting film 22 in the receiving direction.

[0064] The first frame body 210 can be understood as the frame body for installing the infrared emitter 11, and the second frame body 211 can be understood as the frame body for installing the infrared receiver 12. The first frame body 210 includes the frame body in the horizontal direction and the frame body in the vertical direction. The second frame body 211 also includes the frame body in the horizontal direction and the frame body in the vertical direction. Optionally, the frame bodies in the horizontal direction and the vertical direction can be connected by connecting parts (such as screws, snap parts, etc.), or the frame bodies in the horizontal direction and the vertical direction are integrally designed.

[0065] The first frame body 210 and the second frame body 211 are made of the same material and have the same structure. In one embodiment, taking the second frame body 211 as an example, the structure of the frame body is described. Figure 4 (or Figure 5 ) and Figure 6 respectively show the side cross-sectional schematic diagrams of the second frame bodies with two different structures in the infrared touch unit. Refer to Figures 4 to 6, showing a side cross-sectional structure diagram of a part of the second frame body 211. Exemplarily, an infrared Printed Circuit Board (PCB) 212 is installed on the second frame body 211. Optionally, the infrared PCB 212 is located in the inner cavity of the second frame body 211. An infrared receiver 12 is installed on the infrared PCB 212 (it can be understood that an infrared transmitter 11 is installed on the infrared PCB in the first frame body 210). Optionally, two fourth fixing grooves 2111 are provided in the second frame body 211 and are symmetrically arranged. The symmetrically arranged fourth fixing grooves 2111 are used to fix both ends of the infrared PCB 212. In practical applications, other fixing methods can also be adopted for the infrared PCB 212, which is not limited currently.

[0066] The frame body (including the first frame body and the second frame body) is installed around the touch surface. Currently, taking the screen surface of the display screen as an example of the touch surface for description. At this time, the infrared transmitter 11 and the infrared receiver 12 fixed in the inner cavity of the frame body are located above the edge of the display screen, so that the infrared light column generated between the infrared transmitter 11 and the infrared receiver 12 is located above the display screen surface.

[0067] The light-transmitting film 22 has a light-transmitting effect and is used to scatter the incident infrared light. In one embodiment, the infrared light entering the light-transmitting film 22 can change its propagation direction in the light-transmitting film 22, so that when the infrared light exits from the light-transmitting film 22, it has a larger propagation angle, achieving the scattering effect. In one embodiment, the light-transmitting film 22 is similar to the "viewing angle film" in function and can both refract and transmit light. Currently, abstracting the infrared light into infrared rays, after the infrared rays change their propagation directions in the light-transmitting film 22, they will intersect to form multiple intersection points. The infrared rays at each intersection point emit outward after intersection, so that the infrared light has a larger propagation angle, that is, the scattering of the infrared light is realized. It can be understood that when the light intensity at the intersection point (the sum of the intensities of each infrared ray) reaches a certain intensity, the intersection point can be abstracted into a point light source. At this time, the area where multiple point light sources are located can be understood as a surface light source composed of multiple point light sources. The infrared light column formed based on the surface light source has a larger width.

[0068] The internal structure and material of the light-transmitting film 22 can be set according to the actual situation, as long as the requirement of scattering infrared light is met.

[0069] In one embodiment, a light-transmitting film 22 is provided in the receiving direction of at least one infrared receiver 12 to enlarge the propagation angle of the infrared light to be received by the infrared receiver 12, that is, to scatter the infrared light that can be received by the infrared receiver 12. Among them, the selection method of the infrared receiver 12 provided with the light-transmitting film 22 is not limited at present. For example, the light-transmitting film 22 is provided in the receiving direction of the infrared receiver 12 corresponding to the infrared light column with a larger hole. Another example is to select the infrared receiver 12 at a certain interval (every one, two or others) and provide the light-transmitting film 22 in its receiving direction. Still another example is that the light-transmitting film 22 is provided in the receiving direction of each infrared receiver 12. At this time, the light-transmitting films 22 corresponding to the infrared receivers 12 located on the same second frame body 211 (such as the second frame bodies on the same horizontal side or the same vertical side can be understood as the same second frame body) can be one light-transmitting film 22, and the light-transmitting film 22 has a long strip-like film structure. Or, each infrared receiver 12 corresponds to one light-transmitting film 22. At this time, the size of the light-transmitting film 22 is related to the receiving angle of the corresponding infrared receiver 12. It should be noted that Figure 3 an exemplary description is made in which the light-transmitting film 22 is provided in the receiving direction of each infrared receiver 12, and the light-transmitting films 22 on the same side are a long strip-like film structure light-transmitting film 22.

[0070] Or, a light-transmitting film 22 is provided in the emitting direction of at least one infrared emitter 11 to enlarge the propagation angle of the infrared light emitted by the infrared emitter 11, that is, to scatter the infrared light emitted by the infrared emitter 11. Among them, the selection method of the infrared emitter 11 provided with the light-transmitting film 22 is not limited at present and can refer to the selection method of the aforementioned infrared receiver 12, which will not be elaborated here.

[0071] Or, a light-transmitting film 22 is provided in the receiving direction of at least one infrared receiver 12 and a light-transmitting film 22 is provided in the emitting direction of at least one infrared emitter 11. Among them, the selection methods of the infrared emitter 11 and the infrared receiver 12 provided with the light-transmitting film 22 are not limited at present and can refer to the foregoing content, which will not be elaborated here.

[0072] When a light-transmitting film 22 is provided in the receiving direction of at least one infrared receiver 12, the second frame body 211 is further provided with the light-transmitting film 22 located in the receiving direction. When a light-transmitting film 22 is provided in the emitting direction of at least one infrared emitter 11, the first frame body 210 is further provided with the light-transmitting film 22 located in the emitting direction. Among them, the light-transmitting film 22 in the emitting direction and the light-transmitting film 22 in the receiving direction have the same installation method. In one embodiment, taking the light-transmitting film 22 in the receiving direction as an example, the installation method of the light-transmitting film 22 is described.

[0073] In one embodiment, the light-transmitting film 22 is fixed by the frame body. At this time, the first frame body 210 is provided with a first fixing groove for fixing the light-transmitting film in the emission direction; and / or, the second frame body 211 is provided with a second fixing groove for fixing the light-transmitting film in the receiving direction. That is, when the first frame body 210 is further installed with the light-transmitting film 22 in the emission direction, the first frame body 210 is provided with a first fixing groove for fixing the light-transmitting film 22 in the emission direction. When the second frame body 211 is further installed with the light-transmitting film 22 in the receiving direction, the second frame body 211 is provided with a second fixing groove for fixing the light-transmitting film 22 in the receiving direction.

[0074] Since the structures of the first frame body and the second frame body are the same, in this embodiment, taking the second frame body fixing the light-transmitting film as an example for description. At this time, referring to Figure 6 , in the receiving direction of the infrared receiver 12 in the second frame body 211, a second fixing groove 2112 for fixing the light-transmitting film 22 is provided. The second fixing grooves 2112 are two and symmetrically arranged to fix the light-transmitting film 22.

[0075] In another embodiment, the light-transmitting film 22 is fixed on the filter strip 24. At this time, the infrared touch device 20 further includes: a filter strip 24. The light-transmitting film 22 corresponding to the infrared emitter 11 is located between the infrared emitter 11 and the corresponding filter strip 24 and / or the light-transmitting film 22 corresponding to the infrared receiver 12 is located between the infrared receiver 12 and the corresponding filter strip 24. Or, a corresponding filter strip 24 is provided between the light-transmitting film 22 corresponding to the infrared emitter 11 and the infrared emitter 11 and / or a corresponding filter strip 24 is provided between the light-transmitting film 22 corresponding to the infrared receiver 12 and the infrared receiver 12. That is, when the light-transmitting film 22 is provided in the emission direction of the infrared emitter 11, the light-transmitting film 22 is located between the infrared emitter 11 and the corresponding filter strip 24 or the filter strip 24 corresponding to the infrared emitter 11 is located between the light-transmitting film 22 and the infrared emitter 11. When the light-transmitting film 22 is provided in the receiving direction of the infrared receiver 12, the light-transmitting film 22 is located between the infrared receiver 12 and the corresponding filter strip 24 or the filter strip 24 corresponding to the infrared receiver 12 is located between the light-transmitting film 22 and the infrared receiver 12.

[0076] Exemplarily, the filter strip 24 can also be referred to as an infrared filter strip, which is used to filter other interfering light and only allows infrared light to pass through to ensure the reliable implementation of the infrared touch function. Generally, the infrared light emitted by the infrared emitter 11 is emitted outward after passing through the filter strip 24. The infrared light received by the infrared receiver 12 passes through the filter strip 24 first and then is received by the infrared receiver 12. The filter strip 24 used in this embodiment is the same as the filter strip used in related infrared touch technologies and will not be elaborated here.

[0077] Exemplarily, the infrared light can first pass through the filter strip 24 and then through the light-transmitting film 22, or the infrared light first passes through the light-transmitting film 22 and then through the filter strip 24. Among them, when the light-transmitting film 22 is arranged in the emission direction of the infrared emitter 11, the light-transmitting film 22 used by the infrared emitter 11 is arranged between the infrared emitter 11 and the filter strip 24, so that the infrared light emitted by the infrared emitter 11 first passes through the light-transmitting film 22 and then through the filter strip 24. When the light-transmitting film 22 is arranged in the receiving direction of the infrared receiver 12, the light-transmitting film 22 used by the infrared receiver 12 is arranged between the infrared receiver 12 and the filter strip 24, so that the infrared light that the infrared receiver 24 needs to receive first passes through the filter strip 24 and then through the light-transmitting film 22. At this time, the user cannot see the infrared emitter 11, the infrared receiver 12 and the light-transmitting film 22, and can only see the filter strip 24. Or, when the light-transmitting film 22 is arranged in the emission direction of the infrared emitter 11, the filter strip 24 corresponding to the infrared emitter 11 is arranged between the infrared emitter 11 and the light-transmitting film 22 used by the infrared emitter 11, so that the infrared light emitted by the infrared emitter 11 first passes through the filter strip 24 and then through the light-transmitting film 22. When the light-transmitting film 22 is arranged in the receiving direction of the infrared receiver 12, the filter strip 24 corresponding to the infrared receiver 12 is arranged between the infrared receiver 12 and the light-transmitting film 22 used by the infrared receiver 12, so that the infrared light that the infrared receiver 12 needs to receive first passes through the light-transmitting film 22 and then through the filter strip 24.

[0078] It can be understood that Figure 4 and Figure 6 in, the light-transmitting film 22 is arranged between the infrared receiver 12 and the filter strip 24, Figure 5 in, the filter strip 24 is arranged between the infrared receiver 12 and the light-transmitting film 22. Based on Figure 6 the structure shown, the second fixing groove 2112 for fixing the light-transmitting film 22 can also be arranged on the outside of the second frame body 211 (i.e., the other side of the filter strip 24) to realize that the filter strip 24 is arranged between the infrared receiver 12 and the light-transmitting film 22.

[0079] In one embodiment, both the first frame body 210 and the second frame body 211 are provided with a third fixing groove 2113 for fixing the filter strip 24.

[0080] Specifically, taking the second frame body 211 as an example, referring to Figures 4 - 5 , two third fixing grooves 2113 are also arranged in the second frame body 211 and are symmetrically arranged, and the third fixing grooves 2113 are used for fixing the filter strip 24.

[0081] In one embodiment, the light-transmitting film 22 is pasted on the filter strip 24.

[0082] Exemplarily, after the filter strip 24 is fixed, the light-transmitting film 22 can be fixed on the filter strip 24. When fixing, the light-transmitting film 22 can be pasted on the filter strip 24 by glue or other means. Taking the light-transmitting film 22 in the receiving direction of the infrared receiver 12 as an example, when the light-transmitting film 22 is located between the infrared receiver 12 and the filter strip 24, the light-transmitting film 22 is pasted on the side of the filter strip 24 facing the infrared receiver 12. When the filter strip 24 is located between the infrared receiver 12 and the light-transmitting film 22, the light-transmitting film 22 is pasted on the side of the filter strip 24 away from the infrared receiver 12. By the pasting method, there is no need to change the structure of the second frame body 211 of the existing infrared touch device 20, and only the light-transmitting film 22 needs to be pasted on the corresponding side of the filter strip 24. It should be noted that the current second frame body 211 is also provided with a light-transmitting film in the receiving direction, which can be realized by pasting the light-transmitting film 22 on the corresponding side of the filter strip 24.

[0083] In practical applications, in addition to the pasting method, the filter strip 24 and the light-transmitting film 22 can also be made into one film, that is, integrally formed. At this time, the filter strip 24 and the light-transmitting film 22 can use the same fixing groove, and the relative position relationship can be determined according to the relative position relationship between the two and the infrared receiver 12.

[0084] When a light-transmitting film 22 is provided in the transmitting direction of the infrared emitter 11, the fixing method between the filter strip 24 and the light-transmitting film 22 is the same as the fixing method between the filter strip 24 and the light-transmitting film 22 when a light-transmitting film 22 is provided in the receiving direction of the infrared receiver 12, and will not be described separately here.

[0085] It should be noted that two installation methods of the light-transmitting film 22 are exemplarily shown in the embodiment. One is that the light-transmitting film 22 is directly fixed on the frame body (such as Figure 6 ), and the other is that the light-transmitting film 22 is fixed on the filter strip 24 (such as Figure 4 or Figure 5 ). No matter which fixing method is adopted, when the infrared touch device includes a filter strip, a third fixing groove for fixing the filter strip is provided on the frame body of both fixing methods.

[0086] By disposing the light-transmitting film 22 used by the infrared emitter 11 between the infrared emitter 11 and its corresponding filter strip 24, and / or disposing the light-transmitting film 22 used by the infrared receiver 12 between the infrared receiver 12 and its corresponding filter strip 24, the light-transmitting film 22 can be encapsulated inside the infrared touch device 20, facilitating the protection of the light-transmitting film 22 and avoiding scratches on the surface of the light-transmitting film due to external forces after the light-transmitting film 22 is placed outside, which may affect the scattering effect of infrared light. By disposing the filter strip 24 corresponding to the infrared emitter 11 between the infrared emitter 11 and the light-transmitting film 22 used by the infrared emitter 11, and / or disposing the filter strip 24 corresponding to the infrared receiver 12 between the light-transmitting film 22 used by the infrared receiver 12 and the infrared receiver 12, the infrared touch device 20 can be directly used without disassembling and assembling the infrared touch device 20, and only the light-transmitting film 22 needs to be fixed, which is conducive to the popularization and promotion of the light-transmitting film 22.

[0087] Further, after the light-transmitting film 22 is installed, it can scatter infrared light.

[0088] In one embodiment, when the light-transmitting film 22 is disposed in the receiving direction of at least one infrared receiver 12, there may be a situation where the light-transmitting film 22 is not disposed in the emitting direction of the infrared emitter 11 that forms an infrared light column, and the light-transmitting film 22 is disposed in the receiving direction of the infrared receiver 12 that forms an infrared light column. At this time, referring to Figure 7 , Figure 7 is a schematic diagram of an infrared light column provided in an embodiment of the present application. Figure 7 In [the figure], the infrared light on the side of the infrared receiver 12 first passes through the light-transmitting film 22 and then is received by the infrared receiver 12. For ease of understanding, the infrared emitter 11 is abstracted as a point light source, and the infrared light is abstracted as infrared light rays. After the infrared emitter 11 emits infrared light outward, if the infrared receiver 12 is regarded as a device that captures a point light source and forms an image, then the infrared light received by the infrared receiver 12 can be understood as the captured point light source, and there is a light spot in the image obtained based on the received infrared light. The light spot can be understood as the representation of the point light source in the image. The diameter of the light spot can be understood as the width of the infrared light column at the infrared receiver 12. Currently, when the light-transmitting film 22 is not disposed, the infrared light columns generated by the infrared receiver 12 and the infrared emitter 11 are as shown in Figure 2As shown. In one embodiment, after the light-transmitting film 22 is arranged in the receiving direction of the infrared receiver 12, the infrared light first passes through the light-transmitting film 22 and then is captured by the infrared receiver 12. At this time, each infrared ray changes its propagation direction in the light-transmitting film 22 and propagates outward at a larger propagation angle. This process is equivalent to the light-transmitting film 22 magnifying the point light source that can be captured by the infrared receiver 12 (i.e., forming a surface light source composed of multiple point light sources). At this time, some of the infrared light that could not be received by the infrared receiver 12 originally (i.e., when the light-transmitting film 22 is not arranged) can change its propagation direction through the light-transmitting film 22 and propagate towards the direction where the infrared receiver 12 is located and be received by the infrared receiver 12, thereby increasing the width of the infrared light received by the infrared receiver 12 within the receiving angle range (this width is the width of each infrared light when propagating on the side of the infrared receiver 12). That is, based on the captured infrared light, the infrared receiver 12 can obtain a larger light spot (the diameter becomes larger). It should be noted that when all the infrared light emitted by the infrared emitter 11 is received by the infrared receiver 12, the size of the light spot obtained by the infrared receiver 12 is related to the distance between the light-transmitting film 22 and the infrared receiver 12. The larger the distance, the larger the light spot received by the infrared receiver 12. However, due to the limitation of the receiving angle of the infrared receiver 12 and the limitation of the intensity of the received infrared light, the infrared receiver 12 can only receive part of the infrared light, and this part of the infrared light is the infrared light scattered by the light-transmitting film 22. Therefore, the distance between the infrared receiver 12 and the light-transmitting film 22 can be set according to the actual needs to ensure that the light spot received by the infrared receiver 12 is of the desired size. As Figure 7 shown, compared with Figure 2 , after the light-transmitting film 22 is arranged in the receiving direction of the infrared receiver 12, the width of the infrared light column 13 received by it becomes significantly wider. When the infrared emitter 11 emits infrared light outward, it still emits in the existing way of a point light source. Therefore, the change in the width of the infrared light column 13 at the infrared emitter 11 is not obvious. At this time, the width of the infrared light column at the infrared emitter 11 is significantly smaller than the width of the infrared light column at the infrared receiver 12. After such a setting, the width of the infrared light column at each infrared receiver 12 can be increased, thereby making the holes of the light grid near the infrared receiver 12 smaller, and further improving the detection accuracy of touch operations.

[0089] In one embodiment, when the light-transmitting film 22 is arranged in the emission direction of at least one infrared emitter 11, there may be a situation where the light-transmitting film 22 is arranged in the emission direction of the infrared emitter 11 that forms the infrared light column, and the light-transmitting film 22 is not arranged in the receiving direction of the infrared receiver 12 that forms the infrared light column. At this time, referring to Figure 8 , Figure 8 is another schematic diagram of an infrared light column provided by an embodiment of the present application. Figure 8 In it, the infrared light emitted by the infrared emitter 11 first passes through the light-transmitting film 22 and then is emitted outward. It can be understood that compared withFigure 7 Similarly, Figure 8 in the following, the infrared emitter 11 is assumed to be a point light source, and the infrared receiver 12 is compared to a device that captures the point light source and forms an image. When the light-transmitting film 22 is not provided, the infrared light columns generated by the infrared receiver 12 and the infrared emitter 11 are as shown in Figure 2 . In one embodiment, after the light-transmitting film 22 is provided in the emission direction of the infrared emitter 11, the infrared light emitted by the infrared emitter 11 first enters the light-transmitting film 22, and the light-transmitting film 22 causes the infrared light to propagate outward at a larger propagation angle, that is, the point light source becomes larger through the light-transmitting film 22, that is, multiple point light sources are formed, and the multiple point light sources can be understood as a surface light source. Moreover, the distance between the light-transmitting film 22 and the infrared emitter 11 can be set according to actual needs. However, for the infrared receiver 12, the infrared light that can be received within its receiving angle range (i.e., the point light source that can be captured) is not enlarged, that is, the infrared light that can be received at the infrared receiver 12 is not scattered, but only the infrared light that can be received has a larger propagation angle after being scattered by the light-transmitting film 22 at the infrared emitter 11. Therefore, the width of the infrared light column 13 at the infrared emitter 11 will change, while the change in the width of the infrared light column 13 at the infrared receiver 12 is not obvious, that is, the width of the infrared light column at the infrared emitter 11 is significantly greater than the width of the infrared light column at the infrared receiver 12. After such a setting, the width of the infrared light column at each infrared emitter 11 can be increased, thereby making the holes in the light grid closer to the infrared emitter 11 smaller, and further improving the detection accuracy of touch operations.

[0090] In one embodiment, when the light-transmitting film 22 is provided in both the emission direction of at least one infrared emitter 11 and the receiving direction of at least one infrared receiver 12, it is possible that there is no light-transmitting film 22 provided in the emission direction of the infrared emitter 11 that forms the infrared light column, and there is a light-transmitting film 22 provided in the receiving direction of the infrared receiver 12 that forms the infrared light column. In this case, the relevant description of the infrared light column shown in the foregoing Figure 7 can be referred to. It is also possible that there is a light-transmitting film 22 provided in the emission direction of the infrared emitter 11 that forms the infrared light column, and there is no light-transmitting film 22 provided in the receiving direction of the infrared receiver 12 that forms the infrared light column. In this case, the relevant description of the infrared light column shown in the foregoing Figure 8 can be referred to. It is also possible that there is a light-transmitting film 22 provided in both the emission direction of the infrared emitter 11 that forms the infrared light column and the receiving direction of the infrared receiver 12 that forms the infrared light column. For example, Figure 3Each infrared emitter 11 and each infrared receiver 12 correspond to a light-transmitting film 22. At this time, the light-transmitting film 22 in the emission direction of the infrared emitter 11 is used to increase the propagation angle of the infrared light propagating outward, so as to increase the width of the infrared light column 13 at the infrared emitter 11. The light-transmitting film 22 in the receiving direction of the infrared receiver 12 is used to increase the angle of the infrared light that can be received by the infrared receiver 12, so as to increase the width of the infrared light column 13 at the infrared receiver 12. Furthermore, the width of the infrared light column 13 at the infrared emitter 11 and at the infrared receiver 12 is increased, that is, the overall width of the infrared light column 13 is increased. Figure 9 Another schematic diagram of an infrared light column provided by an embodiment of the present application. After the light-transmitting films 22 are arranged in both the emission direction of the infrared emitter 11 and the receiving direction of the infrared receiver 12, compared with Figure 2 , Figure 9 the width of the infrared light column 13 generated by the infrared emitter 11 and the infrared receiver 12 in [reference] becomes larger, and the width of the infrared light column 13 at the infrared emitter 11 and at the infrared receiver 12 is increased, that is, an infrared light column with a larger width is formed to further reduce the size of the holes in the light grid.

[0091] The width of the infrared light column can be understood as the maximum width when each infrared light ray emitted by the same infrared emitter 11 received by the infrared receiver 12 propagates above the touch surface. When the light-transmitting film 22 is only arranged in the emission direction of the infrared emitter 11, each infrared light ray (all emitted by the aforementioned infrared emitter 11) in the infrared light column that can be received by the infrared receiver 12 changes its propagation direction due to the light-transmitting film 22 on the side of the infrared emitter 11, achieving a diffusion effect. Furthermore, each infrared light ray in the infrared light column has a larger width (compared with the case where the light-transmitting film 22 is not arranged) when propagating on the side of the touch surface close to the infrared emitter 11. Therefore, the infrared light column shown in Figure 8 is formed. When the light-transmitting film 22 is only arranged in the receiving direction of the infrared receiver 12, each infrared light ray (all emitted by the same infrared emitter 11) in the infrared light column changes its propagation direction through the light-transmitting film 22 on the side of the infrared receiver 12 and then is received by the infrared receiver, achieving a diffusion effect. At this time, more infrared light rays are received by the infrared receiver 12, that is, some infrared light rays that could not be received by the infrared receiver 12 originally can be received by the infrared receiver 12 due to the change in the propagation direction of the light-transmitting film 22. These infrared light rays have a larger width (compared with the case where the light-transmitting film 22 is not arranged) when propagating on the side of the touch surface close to the infrared receiver 12. Therefore, the infrared light column shown in Figure 7The infrared light column shown. Based on the foregoing description, when the light-transmitting films 22 are provided in both the emission direction of the infrared emitter 11 and the reception direction of the infrared receiver 12, each infrared ray that can be received by the infrared receiver 12 has a greater width when propagating on the side close to the infrared emitter 11 above the touch surface (compared to when the light-transmitting film 22 is not provided), and also has a greater width when propagating on the side close to the infrared receiver 12 above the touch surface (compared to when the light-transmitting film 22 is not provided). Therefore, the overall width of the infrared light column is increased. After the width of the infrared light column is increased, the area of the holes in the infrared light network can be reduced, thereby improving the accuracy of touch detection and positioning. It can be understood that since the currently used infrared emitter 11 and infrared receiver 12 are existing infrared emitters and infrared receivers without additional improvements, compared with the prior art, the angular range of the infrared light emitted by the infrared emitter 11 in the embodiment of the present application has not changed, and only the propagation angle is changed by the light-transmitting film 22. Similarly, the range of the reception angle when the infrared receiver 12 receives infrared light has not changed, and only after the light-transmitting film 22 changes the propagation angle of the infrared light, the infrared light that was not originally received falls within the reception angle range of the infrared receiver.

[0092] It should be noted that after being scattered by the light-transmitting film 22, the light energy of the infrared light column may be weakened. At this time, the amplification level of the infrared light can be increased, that is, when the infrared light is received by the infrared receiver 12 and converted from an optical signal to an electrical signal, a larger amplification level is used to amplify the electrical signal to ensure that the change in light energy is accurately captured, thereby ensuring the detection result of the touch operation.

[0093] As described above, by providing a light-transmitting film for scattering infrared light in the emission direction of at least one infrared emitter and / or providing a light-transmitting film for scattering infrared light in the reception direction of at least one infrared receiver, the width of the infrared light column formed between the infrared emitter and the infrared receiver can be increased (which can include three cases where the width of the infrared light column close to the infrared emitter side increases, the width of the infrared light column close to the infrared receiver side increases, and the widths of the infrared light columns close to the infrared emitter side and the infrared receiver side both increase), thereby making the holes in the light network composed of the infrared light columns smaller, solving the technical problem that large holes are not conducive to touch detection and positioning, improving the accuracy of touch detection and positioning. For example, a finer touch pen tip can be detected and recognized. And there is no need to change the existing hardware structure and size of the infrared emitter and the infrared receiver, and it also avoids an increase in hardware costs. At the same time, there is no need to additionally increase the number of infrared emitters and infrared receivers. And as the width of the infrared light column increases, the number of infrared emitters and infrared receivers can also be appropriately reduced, further saving hardware costs and reducing the scanning period of the infrared light, thereby improving the detection speed of touch operations.

[0094] In one embodiment of the present application,Figure 10 A cross-sectional schematic diagram of a light-transmitting film provided by an embodiment of the present application. Refer to Figure 10 , the light-transmitting film 22 includes a first light-transmitting film, and the first light-transmitting film is composed of a first dielectric part 221 and a second dielectric part 222. The refractive index of the first dielectric part 221 is greater than that of the second dielectric part 222.

[0095] It should be noted that Figure 10 only a cross-sectional schematic diagram of a partial area in the light-transmitting film is shown.

[0096] Exemplarily, both the first dielectric part 221 and the second dielectric part 222 are made of light-transmitting materials. For example, both the first dielectric part 221 and the second dielectric part 222 are made of light-transmitting plastic materials. The difference between the first dielectric part 221 and the second dielectric part 222 is that the refractive index of the first dielectric part 221 is greater than that of the second dielectric part 222. At this time, the first dielectric part 221 can be considered as a light-dense dielectric part, and the second dielectric part 222 can be considered as a light-rare dielectric part. It can be understood that the light-dense dielectric and the light-rare dielectric are relative. For two types of dielectrics, the dielectric with a larger refractive index can be considered as a light-dense dielectric, and the dielectric with a smaller refractive index can be considered as a light-rare dielectric.

[0097] After the first dielectric part 221 and the second dielectric part 222 are combined, a film-shaped light-transmitting film 22 is formed. Currently, the light-transmitting film formed by combining the first dielectric part 221 and the second dielectric part 222 is denoted as the first light-transmitting film.

[0098] Optionally, infrared light enters from one of the first dielectric part 221 and the second dielectric part 222 and exits from the other dielectric part. Among them, when infrared light enters from the first dielectric part 221 into the second dielectric part 222, the refraction angle of the infrared light is greater than the incident angle of the infrared light. And when the incident angle increases to a certain angle, total reflection occurs. Total reflection means that the refraction angle reaches 90°, so that the refracted light completely disappears, leaving only the reflected light. Among them, the incident angle at which total reflection just occurs is used as the critical angle. When infrared light enters the first dielectric part 221 from the second dielectric part 222, the refraction angle of the infrared light is less than the incident angle. Currently, based on the foregoing refraction principle, by setting a reasonable structure for the first dielectric part 221 and the second dielectric part 222, the propagation direction of the infrared light in the light-transmitting film 22 is changed, so that the infrared light forms multiple intersection points to obtain multiple point light sources, and then based on the multiple point light sources, the infrared light is propagated at a larger propagation angle, achieving the effect of infrared light scattering.

[0099] Among them, the structures of the first dielectric part 221 and the second dielectric part 222 can be set according to the actual situation. In an embodiment of the present application, the first contact surface 2211 of the first dielectric part 221 contacts the second contact surface 2221 of the second dielectric part 222, and a plurality of bosses 2212 are provided on the first contact surface 2211, and grooves corresponding to the bosses 2212 are provided on the second contact surface 2221.

[0100] Exemplarily, the surface of the first dielectric part 221 that contacts the second dielectric part 222 is denoted as the first contact surface 2211, and the surface of the second dielectric part 222 that contacts the first dielectric part 221 is denoted as the second contact surface 2221. That is, the first dielectric part 221 and the second dielectric part 222 form a light-transmitting film 22 after contacting through the first contact surface 2211 and the second contact surface 2221.

[0101] Optionally, a plurality of bosses 2212 are provided on the first contact surface 2211, and grooves are formed between two adjacent bosses 2212. The angle between the side surface and the bottom surface of the boss 2212 is less than or equal to 90°. It can be understood that the size of the angle can also be reflected by the slope of the side surface. In an embodiment, taking the angle between the side surface and the bottom surface of the boss 2212 being less than 90° as an example for description, at this time, the cross-section of the boss 2212 is trapezoidal, the lower base of the trapezoid is the bottom surface of the boss 2212, and the upper base of the trapezoid belongs to the first contact surface 2211 and contacts the second contact surface 2221.

[0102] The height of the boss 2212, the angle between the side surface and the bottom surface of the boss 2212, and the distance between adjacent bosses 2212 can be set according to actual needs and are not limited at present. Optionally, the height of the boss 2212, the angle between the side surface and the bottom surface of the boss 2212, and the distance between adjacent bosses 2212 of the first light-transmitting film arranged in the emission direction of the infrared emitter 11 and the first light-transmitting film arranged in the receiving direction of the infrared receiver 12 can be the same or different, and it is only necessary to ensure that when the infrared light is scattered, the width of the formed infrared light column 13 at the infrared emitter 11 and / or the width at the infrared receiver 12 increases.

[0103] When a plurality of bosses 2212 are provided on the first contact surface 2211, a plurality of grooves matching the bosses 2212 are provided on the second contact surface 2221, so that when the first contact surface 2211 and the second contact surface 2221 contact, the bosses 2212 on the first contact surface 2211 contact the grooves on the second contact surface 2221.

[0104] Optionally, in practical applications, it is also possible that the second contact surface 2221 is provided with a plurality of bosses, and the first contact surface 2211 is provided with a plurality of grooves that cooperate with the bosses. Among them, the boss structure of the second contact surface 2221 is similar to the boss structure when the first contact surface 2211 is provided with a plurality of bosses, which will not be elaborated here.

[0105] It should be noted that Figure 10 The shown light-transmitting film 22 has a special structure, that is, the grooves between the bosses 2212 provided on the first contact surface 2211 have the same shape. In practical applications, the shape of the bosses 2212 and the grooves formed by adjacent bosses 2212 may be different. Figure 10 Only the bosses 2212 on the first contact surface 2211 are marked.

[0106] Currently, taking the example that the first contact surface 2211 is provided with a plurality of bosses 2212 for description. After the bosses 2212 on the first contact surface 2211 come into contact with the grooves on the second contact surface 2221, not only can the first medium part 221 and the second medium part 222 be fixed, but also the side surfaces of the bosses 2212 can be used to change the propagation direction of the infrared light to achieve the diffusion of the infrared light.

[0107] In an embodiment of the present application, the infrared light column is composed of a plurality of infrared rays. When the plurality of infrared rays enter the first light-transmitting film from the side of the first medium part 221 facing away from the second medium part 222, the side surfaces of the bosses 2212 are used to totally reflect the infrared rays with an incident angle greater than or equal to the critical angle.

[0108] Exemplarily, Figure 11 FIG. is a schematic diagram of infrared light propagation provided for an embodiment of the present application. Figure 11 Taking Figure 10 the shown first light-transmitting film as an example, a schematic diagram of infrared light propagation when the infrared light enters the first light-transmitting film from the first medium part 221 is described.

[0109] When a light-transmitting film 22 is provided in the emission direction of the infrared emitter 11, the infrared emitter 11 can emit infrared light in various directions within the emission angle range. For the sake of easy understanding, the infrared light emitted by the infrared emitter 11 is geometrically abstracted into infrared rays. Among them, there is a corresponding infrared ray in each emission direction of the infrared emitter 11. These infrared rays enter the first light-transmitting film from various directions. Similarly, when a light-transmitting film 22 is provided in the receiving direction of the infrared receiver 12, the infrared receiver 12 also receives infrared rays from various directions within the receiving angle range. Before these infrared rays are received by the infrared receiver 12, they can enter the first light-transmitting film from various directions.

[0110] Currently, when infrared light enters the first light-transmitting film from the first medium portion 221, specifically, it enters the first light-transmitting film from the side of the first medium portion 221 facing away from the second medium portion 222 (i.e., the other side opposite to the first contact surface 2211), and then exits from the side of the second medium portion 222 facing away from the first medium portion 221.

[0111] Optionally, when infrared light enters the first light-transmitting film, if the first medium portion 221 and air have different refractive indices, then refraction occurs when the infrared light enters the first medium portion 221. When the infrared light is perpendicularly incident on the first medium portion 221, the incident angle is 0°, and at this time, the refraction angle of the infrared light is 0°, that is, the propagation direction of the infrared light remains unchanged. Figure 11 Only the propagation schematic diagram of some infrared light perpendicularly incident on the first light-transmitting film is shown.

[0112] Refraction also occurs when infrared light enters the second medium portion 222 from the first medium portion 221. Moreover, when the incident angle of the infrared light entering the second medium portion 222 from the first medium portion 221 is greater than or equal to the critical angle, total internal reflection of the infrared light occurs. If the infrared light after total internal reflection still enters the second medium portion 222, then refraction occurs when it enters the second medium portion 222. Refer to Figure 11 , the infrared light can enter the second medium portion 222 from the side surface of the convex platform 2212, the top surface of the convex platform 2212, and the bottom surface of the groove between adjacent convex platforms 2212 in the first contact surface 2211. Total internal reflection may occur on these three surfaces. However, due to the limitation of the emission angle range of the infrared emitter 11, most of the infrared light that undergoes total internal reflection in the first medium portion 221 is concentrated on the side surface of the convex platform 2212, and the number of infrared light that undergoes total internal reflection on the other two surfaces is very small. In the embodiment, only the total internal reflection infrared light on the side surface of the convex platform 2212 is described exemplarily. For example, Figure 11 As shown, when the infrared light enters the first medium portion 221 along the vertical direction (i.e., the incident angle is 0°) and reaches the side surface of the convex platform 2212, the incident angle on the side surface of the convex platform 2212 is greater than or equal to the critical angle, and at this time, total internal reflection of the infrared light occurs. After total internal reflection, the infrared light enters the second medium portion 222 from other positions of the first contact surface 2211 ( Figure 11 taking entering the second medium portion 222 from the top surface of the convex platform 2212 as an example). Generally speaking, each infrared light after total internal reflection rarely undergoes total internal reflection again, and most of them will enter the second medium portion 222. It can be understood that a convex platform 2212 has two side surfaces, and the infrared light that undergoes total internal reflection on the two side surfaces will intersect (a point light source can be formed) and then diverge (refer to Figure 11 two infrared lights within a convex platform 2212 intersect and diverge in the second medium portion 222 shown). The diverged infrared light will propagate along a larger range, thereby achieving an expansion of the propagation angle of the infrared light and further achieving the scattering of infrared light.

[0113] When the infrared light in the second dielectric part 222 propagates outward, if the second dielectric part 222 and air have different refractive indices, the infrared light is refracted when it exits the second dielectric part 222.

[0114] It should be noted that Figure 11 The refraction that occurs when the mid-infrared light propagates outward from the second dielectric part 222 is not shown. In practical applications, when the infrared light propagates outward from the second dielectric part 222, even if refraction occurs, it will make the emitted infrared light have a larger propagation angle compared to the infrared light incident on the first dielectric part, that is, the scattering of infrared light is achieved.

[0115] Since the propagation direction of the infrared light changes after passing through the first light-transmitting film, especially after total reflection, the propagation angle of the infrared light is enlarged. Therefore, the scattering of infrared light is achieved.

[0116] In one embodiment, the angle between the side surface and the bottom surface of the boss 2212 is an acute angle, and the angle of the angle is determined according to the expected width of the infrared light column after scattering.

[0117] It can be understood that when the angle between the side surface and the bottom surface of the boss 2212 changes, the angle and the incident position of the infrared light on the side surface of the boss 2212 will change, which will further cause the number of infrared light rays undergoing total reflection and the propagation direction of the infrared light after total reflection to change. These changes will cause the scattering amplitude of the infrared light to change. When the scattering amplitude of the infrared light is different, it will affect the width of the generated infrared light column. When the scattering amplitude becomes larger, the width of the infrared light column will also become larger. It should be noted that the scattering amplitude of the infrared light and the width of the infrared light column will not expand infinitely. Here, it is only to illustrate that the change in the angle between the side surface and the bottom surface of the boss 2212 will change the width of the infrared light column. Therefore, when designing the first light-transmitting film, the angle between the side surface and the bottom surface of the boss 2212 can be determined according to the expected width of the infrared light column.

[0118] In one embodiment of the present application, in addition to being incident on the light-transmitting film 22 from the first dielectric part 221, the infrared light can also be incident on the light-transmitting film 22 from the second dielectric part 222. At this time, the infrared light column is composed of multiple infrared light rays. When the multiple infrared light rays enter the first light-transmitting film from the side facing away from the first dielectric part 221 in the second dielectric part 222, the side surface of the boss 2212 is used to refract the infrared light entering the first dielectric part 221.

[0119] Exemplarily, Figure 12 is another schematic diagram of infrared light propagation provided by an embodiment of the present application. Figure 12 With Figure 10Taking the light-transmitting film 22 shown as an example, a schematic diagram of the infrared light propagation when the infrared light enters the first light-transmitting film from the second medium part 222 is described.

[0120] Currently, when the infrared light ray enters the first light-transmitting film from the second medium part 222, specifically, it first enters the light-transmitting film from the side of the second medium part 222 that is away from the first medium part 221 (i.e., the other side opposite to the second contact surface 2221), and then exits from the side of the first medium part 221 that is away from the second medium part 222.

[0121] Optionally, when the infrared light ray enters the light-transmitting film 22, if the second medium part 222 and air have different refractive indices, the infrared light ray refracts when it enters the second medium part 222. When the infrared light ray is perpendicularly incident on the second medium part 222, the incident angle is 0°, and at this time, the refraction angle of the infrared light ray is 0°, that is, the propagation direction of the infrared light ray remains unchanged. Figure 12 Only a schematic diagram of the propagation of some infrared light rays perpendicularly incident on the light-transmitting film 22 is shown.

[0122] The infrared light ray refracts when it enters the first medium part 221 from the second medium part 222. Referring to Figure 12 , the infrared light ray can enter the first medium part 221 from the side surface of the groove in the second contact surface 2221 that cooperates with the boss 2212 (this side surface contacts the side surface of the boss 2212), the bottom surface of the groove (this bottom surface contacts the top surface of the boss 2212), and the top surface of the protrusion between adjacent grooves (this top surface contacts the bottom surface of the groove between adjacent bosses 2212). And when entering the first medium part 221, the refraction angle is less than the incident angle to change the propagation direction of the infrared light ray. Among them, based on the setting that the angle between the side surface of the boss 2212 and the bottom surface of the boss 2212 is an acute angle, part of the infrared light rays entering the first medium part 221 from the two side surfaces of the groove in the second medium part 222 intersect after refraction (a point light source can be formed), and after intersection, they propagate along a larger range (refer to Figure 12 where two infrared light rays in a groove in the first medium part 221 intersect and then diverge), so as to achieve an expansion of the propagation angle of the infrared light ray, and thus achieve the scattering of the infrared light.

[0123] In one embodiment, the angle between the side surface of the boss 2212 and the bottom surface of the boss 2212 is an acute angle, and the angle is determined according to the expected width after the infrared light column is scattered.

[0124] It can be understood that when the angle between the side surface of the boss 2212 in contact with the groove in the second medium portion 222 and the bottom surface of the boss 2212 changes, the slope of the side surface of the groove also changes. At this time, the angle of incidence and the incident position of the infrared light on the side surface of the groove will change, and further cause the number of infrared light passing through the side surface of the groove and the propagation direction of the refracted infrared light to change. These changes will cause the scattering amplitude of the infrared light to change. When the scattering amplitude of the infrared light is different, it will also affect the width of the infrared light column. When the scattering amplitude becomes larger, the width of the infrared light column will also become larger. It should be noted that the scattering amplitude of the infrared light and the width of the infrared light column will not increase infinitely. Here, it is only to illustrate that the change in the angle between the side surface of the boss 2212 and the bottom surface of the boss 2212 will change the width of the infrared light column. Therefore, when designing the first light-transmitting film, the angle between the side surface of the boss 2212 and the bottom surface of the boss 2212 can be determined according to the desired width of the infrared light column, and then the slope of the side surface of the groove corresponding to the boss 2212 can be determined.

[0125] When the infrared light in the first medium portion 221 propagates outward, if the first medium portion 221 and air have different refractive indexes, the infrared light will also be refracted when it exits from the first medium portion 221.

[0126] It should be noted that Figure 12 the refraction that occurs when the mid-infrared light propagates outward from the first medium portion 221 is not shown. In practical applications, when the infrared light propagates outward from the first medium portion 221, even if refraction occurs, the emitted infrared light will have a larger propagation angle than the infrared light incident on the second medium portion 222, that is, the scattering of the infrared light is realized.

[0127] As described above, since the propagation direction of the infrared light changes after passing through the first light-transmitting film, especially after being refracted by the side surface of the groove in the second medium portion 222, the propagation angle of the infrared light is enlarged. Therefore, the scattering of the infrared light is realized.

[0128] It should be noted that in addition to the above Figures 10 - 12 shown structure, the light-transmitting film 22 can also adopt other structures. In an embodiment of the present application, the light-transmitting film 22 includes a second light-transmitting film, and one side of the second light-transmitting film is a non-smooth surface, and the non-smooth surface is used to change the propagation angle of the infrared light. The infrared light enters the second light-transmitting film from the non-smooth surface or the infrared light enters the second light-transmitting film from the side opposite to the non-smooth surface in the second light-transmitting film.

[0129] Exemplarily, the light-transmitting film 22 may also be a film-like structure formed of the same medium. Currently, this film-like light-transmitting film 22 is denoted as the second light-transmitting film. Among them, the refractive index and material of the second light-transmitting film are not limited at present. In one embodiment, the second light-transmitting film is described by taking the PET material as an example. Among them, PET generally refers to polyethylene terephthalate, which is the most important variety in thermoplastic polyesters.

[0130] One of the two surfaces of the second light-transmitting film is a non-smooth plane. Currently, this non-smooth plane is denoted as the non-smooth surface. The other surface of the second light-transmitting film can be denoted as the smooth surface. It should be noted that the smoothness of the smooth surface is much greater than that of the non-smooth surface. The thickness between the smooth surface and the non-smooth surface is not limited at present.

[0131] Generally speaking, when infrared light is refracted, the size of the refraction angle is related not only to the refractive index but also to the angle of the incident angle. And the angle of the incident angle is related to the propagation direction of the infrared light and the direction of the incident plane. For example, when the infrared light is incident, the incident angle is 20°. When the propagation direction of the infrared light remains unchanged, by adjusting the direction of the incident plane (such as adjusting the angle between the incident plane and the horizontal plane to achieve the adjustment of the plane direction), the angle of the incident angle can be changed. For example, by adjusting the plane direction, the incident angle becomes 30°. At this time, the refraction angle corresponding to the incident angle of 20° is different from the refraction angle corresponding to the incident angle of 30°. Based on this, in the embodiment, by setting a non-smooth surface in the second light-transmitting film and setting a reasonable structure for the non-smooth surface, each infrared light has multiple plane directions when passing through the non-smooth surface. It can be understood that since the infrared light has different propagation directions and the non-smooth surface also has multiple plane directions, therefore, compared with the refraction that occurs when passing through the smooth surface, the change amplitude of the propagation direction of each infrared light after refraction when passing through the non-smooth surface is greater, that is, the propagation angle of the infrared light becomes larger, thereby realizing the scattering of the infrared light.

[0132] It can be understood that when the infrared light passes through the second light-transmitting film and is refracted, the propagation direction of the infrared light changes, so that multiple infrared lights intersect after changing the propagation direction. When the number of intersecting infrared lights is large, it can be considered that new point light sources are formed. At this time, the range where each point light source formed by the second light-transmitting film is located is larger than the light source range formed by the corresponding infrared emitter 11 and / or larger than the light source range captured by the infrared receiver 12, that is, the width of the infrared light column 13 at the infrared emitter 11 and / or the infrared receiver 12 is increased.

[0133] In one embodiment, the non-smooth surface includes a plurality of semi-cylindrical curved surfaces, or the non-smooth surface is a drawn surface formed by drawing in the same direction.

[0134] Exemplarily, Figure 13Schematic diagram of a light-transmitting film provided by an embodiment of the present application. Refer to Figure 13 , the non-smooth surface 223 of the second light-transmitting film is composed of a plurality of semi-cylindrical curved surfaces. It can be understood that the longer the length of the second light-transmitting film, the more the number of curved surfaces required. Specifically, the second light-transmitting film is composed of a plurality of semi-cylinders made of PET material. The curved surfaces of each semi-cylinder form the non-smooth surface 223 of the second light-transmitting film, and the plane opposite to the curved surface in each semi-cylinder forms the smooth surface 224 of the second light-transmitting film. Optionally, the sizes of the semi-cylinders in the second light-transmitting film are the same, and the curvature of the curved surface in the semi-cylinder can be set according to actual needs. In one embodiment, in order to ensure the scattering effect, the size of the curved surface can be set to the um (micrometer) level. Among them, the size of the curved surface can also be understood as the diameter of the semi-circle corresponding to the curved surface. When the infrared light passes through the curved surface, refraction occurs, and the refracted infrared light propagates along a larger angular range to achieve the diffusion of the infrared light.

[0135] It should be noted that when the infrared light is incident from the smooth surface 224 and exits from the non-smooth surface 223, the scattering of the infrared light can be achieved. When the infrared light is incident from the non-smooth surface 223 and exits from the smooth surface 224, the scattering of the infrared light can also be achieved, and both transmission methods achieve scattering through the refraction occurring at the non-smooth surface 223. In one embodiment, the description is made by taking the infrared light incident from the smooth surface 224 into the second light-transmitting film as an example. Figure 14 Another schematic diagram of infrared light propagation provided by an embodiment of the present application, Figure 14 Taking Figure 13 the shown light-transmitting film as an example, the schematic diagram of infrared light propagation when the infrared light is incident from the smooth surface 224 into the second light-transmitting film is described.

[0136] Optionally, the infrared light can enter the second light-transmitting film from all directions and is refracted at the smooth surface 224. When the infrared light is vertically incident on the smooth surface 224, the incident angle is 0°, and at this time, the refraction angle of the infrared light is 0°, that is, the propagation direction of the infrared light remains unchanged. Figure 14 Only the schematic diagram of the propagation of some infrared light vertically incident on the second light-transmitting film is shown.

[0137] Refer to Figure 14 , when the infrared light is vertically incident on the smooth surface 224, no refraction occurs, and it propagates in the original propagation direction and then exits through the non-smooth surface 223. Among them, the infrared light refracts when passing through the non-smooth surface 223. At this time, most of the infrared light changes its propagation direction, and the refracted infrared light will propagate along a larger range, thereby achieving the expansion of the propagation angle of the infrared light and further realizing the scattering of the infrared light.

[0138] Exemplarily, Figure 15 Another schematic diagram of a light-transmitting film provided by an embodiment of the present application. Refer to Figure 15, the non-smooth surface 223 of the second light-transmitting film is a wire-drawing surface in the same direction. In the embodiment, the wire-drawing surface in the same direction can be understood as irregular wire-drawing on the non-smooth surface 223 of the second light-transmitting film in the same direction to obtain a surface with consistent direction, random thickness and length. It can be understood that the surface before wire-drawing is a smooth plane, and the surface after wire-drawing is a non-smooth surface. Figure 16 This is a schematic diagram of a wire-drawing surface provided by an embodiment of the present application, which is an actual effect diagram of the non-smooth surface 223. Refer to Figure 16 , the wire-drawing surface presents as a gully-like shape with random thickness and length in the same direction ( Figure 16 in the figure is the up and down direction). Optionally, the direction of wire-drawing is not limited at present, Figure 15 and Figure 16 in the figure, an exemplary description is made with the wire-drawing direction perpendicular to the long side of the second light-transmitting film.

[0139] Exemplarily, after irregular wire-drawing on one side of the second light-transmitting film made of PET material in the same direction, the non-smooth surface 223 is obtained, and the other side of the second light-transmitting film remains unchanged and serves as the smooth surface 224. In one embodiment, in order to ensure the scattering effect, the size of the gully-like shape can be set to the um (micrometer) level. Among them, the size of the gully-like shape can also be understood as the width and length of the gully-like shape. Similar to the refraction principle of the curved surface, when the infrared light passes through the non-smooth surface of the gully-like shape, refraction occurs, and the refracted infrared light propagates in a larger angular range to achieve the diffusion of the infrared light.

[0140] Currently, taking the infrared light entering the second light-transmitting film from the smooth surface 224 as an example for description. Figure 17 This is another schematic diagram of infrared light propagation provided by an embodiment of the present application. Figure 17 Taking Figure 15 the shown light-transmitting film as an example, the propagation schematic diagram of the infrared light when it enters the second light-transmitting film from the smooth surface 224 is described.

[0141] Optionally, the infrared light can enter the second light-transmitting film from all directions and is refracted at the smooth surface 224. When the infrared light is perpendicularly incident on the smooth surface 224, the incident angle is 0°, and at this time, the refraction angle of the infrared light is 0°, that is, the propagation direction of the infrared light remains unchanged. Figure 17 Only the propagation schematic diagram of some infrared light perpendicularly incident on the second light-transmitting film is shown.

[0142] Refer to Figure 17, when the infrared light vertically enters the smooth surface 224, no refraction occurs, and it propagates in the original direction and then exits through the non-smooth surface 223. Among them, refraction occurs when the infrared light passes through the non-smooth surface 223. At this time, most of the infrared light changes its propagation direction, and the refracted infrared light will propagate along a larger range, thereby achieving an expansion of the propagation angle of the infrared light and further achieving the scattering of the infrared light.

[0143] As described above, by setting a non-smooth surface for the second light-transmitting film, the propagation angle of the infrared light after refraction is expanded, thereby achieving the scattering of the infrared light. Moreover, the non-smooth surface can be flexibly designed into various structures according to actual needs, reducing the design difficulty of the non-smooth surface.

[0144] In an embodiment of the present application, when the light-transmitting film 22 includes a second light-transmitting film, the light-transmitting film 22 further includes a third light-transmitting film 225, and the third light-transmitting film 225 is disposed on the side of the second light-transmitting film facing away from the non-smooth surface 223 (i.e., the smooth surface 224), and the third light-transmitting film 225 is used to support the second light-transmitting film.

[0145] Exemplarily, the third light-transmitting film 225 can be understood as a film-like structure with a certain thickness and light transmissivity. Generally speaking, the thickness of the third light-transmitting film 225 is greater than that of the second light-transmitting film. Optionally, the third light-transmitting film 225 and the second light-transmitting film are made of the same material and have the same refractive index.

[0146] Figure 18 For Figure 13 the schematic structural diagram of the light-transmitting film after adding the third light-transmitting film as shown. Figure 19 For Figure 15 the schematic structural diagram of the light-transmitting film after adding the third light-transmitting film as shown, referring to Figure 18 and Figure 19 , the third light-transmitting film 225 is disposed on the side of the smooth surface 224 of the second light-transmitting film, and it has a supporting effect and can also be understood as the base of the light-transmitting film 22. It should be noted that in actual applications, the second light-transmitting film and the third light-transmitting film 225 can also be designed as an integral structure.

[0147] As described above, by adding the third light-transmitting film, when the second light-transmitting film is applied, the second light-transmitting film can be strengthened and protected, that is, a base is added to the second light-transmitting film, making the second light-transmitting film more firm.

[0148] It can be seen from this that two light-transmitting films with different structures are provided in the embodiment of the present application, one is the first light-transmitting film, and the other is the second light-transmitting film. Moreover, when the second light-transmitting film is applied, a third light-transmitting film for support can also be provided.

[0149] In one embodiment of the present application, the infrared touch device 20 further includes: a plastic layer 23 disposed on the side of the light-transmitting film 22 where infrared light is incident. The surface of the plastic layer 23 facing away from the light-transmitting film 22 is a low-roughness surface, and the low-roughness surface satisfies a set roughness range.

[0150] Exemplarily, a plastic film is added to the side of the light-transmitting film 22 where infrared light is incident to increase the intensity of the infrared light incident on the light-transmitting film 22. Currently, this layer of plastic film is denoted as the plastic layer 23. The length and width of the plastic layer 23 are the same as those of the light-transmitting film 22, and the thickness of the plastic layer 23 can be set according to actual needs, generally less than the thickness of the light-transmitting film 22. The plastic layer 23 can be fixed to the side of the light-transmitting film 22 where infrared light is incident by pasting. The plastic layer 23 and the light-transmitting film 22 can also be designed as an integral structure.

[0151] For example, Figure 20 FIG. is a schematic diagram of the positional relationship between the plastic layer and the light-transmitting film provided in one embodiment of the present application. Figure 20 Taking Figure 10 the shown light-transmitting film (i.e., the first light-transmitting film) as an example, the schematic diagram of the positional relationship between the plastic layer and the light-transmitting film is described. In practical applications, a plastic layer can also be provided on other-structured light-transmitting films. For example, Figure 13 , Figure 15 , Figure 18 and Figure 19 the shown light-transmitting films (i.e., the second light-transmitting films) can all be provided with plastic films. Referring to Figure 20 , taking the other side of the first dielectric part 221 away from the first contact surface 2211 as the side where infrared light is incident. At this time, the plastic layer 23 is disposed on the side of the light-transmitting film 22 where infrared light is incident and is in contact with the surface of this side, that is, infrared light first enters the plastic layer 23 and then enters the light-transmitting film 22 through the plastic layer 23.

[0152] In the embodiment, taking the plastic layer 23 as made of PET material as an example, in practical applications, the plastic layer 23 can also be made of other materials.

[0153] The surface of the plastic layer 23 where infrared light is incident has low roughness. Currently, it is denoted as the low-roughness surface. Among them, roughness can be understood as the degree of roughness of the surface, and its measurement unit is Ra. Low roughness can be understood as a relatively low (smoother) degree of roughness of the surface. The roughness of the low-roughness surface satisfies a set roughness range. Among them, the set roughness range can be understood as a set of roughness values representing low roughness set in advance, and its specific value can be set according to actual situations. In one embodiment, the set roughness range is 0.1Ra - 1Ra.

[0154] Exemplarily, for a low-roughness surface, most of the infrared light incident on the low-roughness surface will be transmitted into the plastic layer 23 and then into the light-transmitting film 22. Only a small part of the infrared light is diffusely reflected on the low-roughness surface. The diffusely reflected infrared light will be directed towards the frame body and re-enter the plastic layer 23 after being reflected by the frame body, thereby achieving the secondary incidence of the infrared light. It can be understood that the infrared light with secondary incidence can also be diffusely reflected, thereby achieving the tertiary incidence.

[0155] It should be noted that since the propagation process of infrared light consumes energy (i.e., the intensity weakens), the intensity of the infrared light with secondary incidence after diffuse reflection will weaken. For the same number of infrared light rays (which can propagate in multiple directions), when the plastic layer 23 is not provided, when these infrared light rays are directed towards the light-transmitting film 22, the number of diffusely reflected infrared light rays is greater than the number of diffusely reflected infrared light rays when these infrared light rays are directed towards the low-roughness surface. That is, when the plastic layer 23 is provided, the number of originally diffusely reflected infrared light rays becomes smaller, and more infrared light rays are directly transmitted through the plastic layer 23 into the light-transmitting film 22 without secondary incidence, thereby increasing the intensity of the infrared light incident on the light-transmitting film 22 and improving the signal quality of the infrared light.

[0156] In one embodiment of the present application, an infrared touch screen is further provided, wherein, Figure 21 is a schematic structural diagram of an infrared touch screen provided by an embodiment of the present application. Refer to Figure 21 , the infrared touch screen 30 includes a display screen 40 having a touch surface and the infrared touch device 20 in the foregoing embodiment.

[0157] Among them, the display screen 40 can be a liquid crystal display screen, an LED display screen, an OLED display screen, etc. The display screen 40 is mainly used for imaging. The infrared touch device 20 is installed around the display screen 40. The infrared touch device 20 is used to detect touch operations on the display screen 40 and perform touch positioning. The installation method of the infrared touch device 20 is not limited forward. In one embodiment, after the infrared touch device 20 is installed around the display screen 40, the infrared light network formed by the infrared transmitters 11 and the infrared receivers 12 covers the screen of the display screen 40. For example, refer to Figures 4 - 6, which shows a part of the glass cover plate 41 in the display screen. Among them, the glass cover plate 41 is the outermost layer in the imaging surface of the display screen and is used to protect the devices inside the display screen. When a user touches the infrared touch screen, what is touched is the glass cover plate 41 on the surface of the display screen 40. That is, the glass cover plate 41 can be understood as the touch surface. When the infrared touch device 20 is arranged around the display screen 40, part of the area of the frame body is located at the edge of the glass cover plate 41, and another part of the area is located above the glass cover plate 41. And an infrared emitter 11 (or an infrared receiver 12), a filter strip 24, and a light-transmitting film 22 are installed in the part of the frame body located above, so that the infrared light emitted by the infrared emitter 11 propagates on the surface of the glass cover plate 31.

[0158] Optionally, the infrared touch screen 30 can be an independent display device or can be integrated into an electronic device capable of displaying. Among them, the electronic device can be an interactive flat panel using an infrared touch screen, an interactive query touch advertising machine, or other electronic devices.

[0159] The above infrared touch screen 30 includes the touch device 20 and has corresponding functions and beneficial effects.

[0160] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0161] Note that the above is only the preferred embodiment of the present application and the applied technical principle. Those skilled in the art will understand that the present application is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the concept of the present application, more other equivalent embodiments can be included, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An infrared touch device, wherein, Including: An infrared touch unit and a light-transmitting film, The infrared touch unit includes a plurality of infrared transmitters and a plurality of infrared receivers. An infrared light column is formed between the infrared transmitter and the corresponding infrared receiver, and the light network formed by each infrared light column is used to cover above the touch surface; A light-transmitting film is arranged in the emission direction of at least one of the infrared transmitters and / or the receiving direction of at least one of the infrared receivers. The light-transmitting film located in the emission direction is used to scatter the infrared light emitted by the corresponding infrared transmitter, and the light-transmitting film located in the receiving direction is used to scatter the infrared light received by the corresponding infrared receiver.

2. The infrared touch device according to claim 1, wherein, The light-transmitting film includes a first light-transmitting film, and the first light-transmitting film is composed of a first dielectric part and a second dielectric part. The refractive index of the first dielectric part is greater than that of the second dielectric part.

3. The infrared touch device according to claim 2, wherein, The first contact surface of the first dielectric part contacts the second contact surface of the second dielectric part, and a plurality of protrusions are arranged at intervals on the first contact surface, and grooves corresponding to the protrusions are arranged on the second contact surface.

4. The infrared touch device according to claim 3, wherein, The infrared light column is composed of a plurality of infrared rays. When the plurality of infrared rays enter the first light-transmitting film from the side facing away from the second dielectric part in the first dielectric part, the side surface of the protrusion is used to totally reflect the infrared rays with an incident angle greater than or equal to the critical angle.

5. The infrared touch device according to claim 3, wherein, The infrared light column is composed of a plurality of infrared rays. When the plurality of infrared rays enter the first light-transmitting film from the side facing away from the first dielectric part in the second dielectric part, the side surface of the protrusion is used to refract the infrared rays entering the first dielectric part.

6. The infrared touch device according to any one of claims 3-5, wherein, The included angle between the side surface and the bottom surface of the protrusion is an acute angle, and the angle of the included angle is determined according to the expected width after the scattering of the infrared light column.

7. The infrared touch device according to claim 1, wherein, The light-transmitting film includes a second light-transmitting film. One side of the second light-transmitting film is a non-smooth surface, and the non-smooth surface is used to change the propagation angle of the infrared light. The infrared light enters the second light-transmitting film from the non-smooth surface or the infrared light enters the second light-transmitting film from the side facing away from the non-smooth surface in the second light-transmitting film.

8. The infrared touch device according to claim 7, wherein, The non-smooth surface includes a plurality of semi-cylindrical curved surfaces, or the non-smooth surface is a wire-drawn surface formed by wire-drawing in the same direction.

9. The infrared touch device according to claim 7 or 8, wherein The light-transmitting film further includes: a third light-transmitting film, and the third light-transmitting film is placed on the side of the second light-transmitting film facing away from the non-smooth surface, and the third light-transmitting film is used to support the second light-transmitting film.

10. The infrared touch device according to claim 1, wherein, The infrared touch device further includes: a plastic layer, and the plastic layer is placed on the side of the light-transmitting film where the infrared light is incident. The side of the plastic layer facing away from the light-transmitting film is a low-roughness surface, and the low-roughness surface satisfies a set roughness range.

11. The infrared touch device according to claim 1, wherein, The infrared touch unit further includes: a first frame body and a second frame body. The first frame body is installed with the infrared transmitter, the second frame body is installed with the infrared receiver, and the first frame body is further installed with the light-transmitting film located in the emission direction and / or the second frame body is further installed with the light-transmitting film located in the receiving direction.

12. The infrared touch device according to claim 11, wherein, The first frame body is provided with a first fixing groove for fixing the light-transmitting film located in the emission direction; and / or The second frame body is provided with a second fixing groove for fixing the light-transmitting film located in the receiving direction.

13. The infrared touch device according to claim 11, wherein, The infrared touch device further includes: a light filter strip, the light-transmitting film corresponding to the infrared emitter is located between the infrared emitter and the corresponding light filter strip and / or the light-transmitting film corresponding to the infrared receiver is located between the infrared receiver and the corresponding light filter strip, or, a corresponding light filter strip is provided between the light-transmitting film corresponding to the infrared emitter and the infrared emitter and / or a corresponding light filter strip is provided between the light-transmitting film corresponding to the infrared receiver and the infrared receiver.

14. The infrared touch device according to claim 13, wherein, Both the first frame body and the second frame body are provided with a third fixing groove for fixing the light filter strip.

15. The infrared touch device according to claim 13, wherein, The light-transmitting film is adhered to the light filter strip.

16. An infrared touch screen, wherein, Comprising: A display screen having a touch surface and the infrared touch device according to any one of claims 1-15.

Images