Heteroaxial scanning touch screen

Abstract

The utility model provides a heteroaxial scanning touch screen which comprises a main body and a plurality of scanning elements, the main body is provided with a plurality of shaft edges, each shaft edge is provided with a plurality of scanning elements, the scanning elements are transmitting elements and / or receiving elements, and the transmitting elements and the receiving elements need to exist on the two shaft edges of the countershaft at the same time; the transmitting range of each transmitting element covers the opposite shaft edge and the adjacent shaft edge, and each receiving element is used for receiving infrared light emitted by the transmitting element on the opposite shaft edge and receiving infrared light emitted by the transmitting element on the adjacent shaft edge. According to the utility model, the optical network density can be improved, and the touch identification accuracy of the touch screen is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch control, in particular to a different-axis scanning touch screen. Background Art

[0002] Traditional infrared touch screens usually use two sets of transmitting arrays and two sets of receiving arrays to achieve scanning purposes, that is, the transmitting array located on the long side of the touch screen emits infrared light, and the receiving array on the other long side of the touch screen directly opposite it receives the infrared light; similarly, another set of transmitting arrays is located on the short side of the touch screen, and the infrared light it emits is received by the receiving array on the other short side of the touch screen directly opposite it.

[0003] This type of scanning touch screen is called an axis scanning touch screen, and the light between its infrared transmitting array and infrared receiving array forms an optical network in the X and Y directions in the touch area. However, due to the limitation of the transmitting and receiving angles of the receiving and transmitting infrared LEDs, the intersection points formed by the optical network (the intersection points formed by the light emitted by the X and Y axes) are sparser in the area closer to the transmitting / receiving LEDs. Small touch objects cannot be recognized in many areas at the edge of the touch screen, resulting in reduced accuracy. This defect is particularly obvious on large-size touch screens, and the customer interaction experience is extremely poor. If the blind area needs to be reduced, the LED arrangement density needs to be increased, resulting in a significant increase in cost. Utility Model Content

[0004] The present invention provides a different-axis scanning touch screen to solve the problems existing in the related art. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the utility model provides a different-axis scanning touch screen, comprising a main body and a plurality of scanning elements;

[0006] The main body is provided with a plurality of axial edges, each axial edge is provided with a plurality of scanning elements, the scanning elements are transmitting elements and / or receiving elements, and the two axial edges of the opposite axes need to be provided with transmitting elements and receiving elements at the same time;

[0007] The emission range of each emitting element covers the axial edge facing it and the axial edge adjacent to it, and each receiving element is used to receive the infrared light emitted by the emitting element on the axial edge facing it and the infrared light emitted by the emitting element on the axial edge adjacent to it.

[0008] In one embodiment, both the transmitting element and the receiving element are disposed on the same axial edge; or, only the transmitting element is disposed on the same axial edge; or, only the receiving element is disposed on the same axial edge.

[0009] In one implementation, the total number of elements on each axis is not equal, and the total number of elements refers to the sum of the number of all transmitting elements and receiving elements on the same axis.

[0010] In one implementation, the total number of elements located on two opposite axial sides is the same, and the total number of elements refers to the sum of the number of all transmitting elements and receiving elements on the same axial side.

[0011] In one embodiment, the component arrangement density corresponding to the edge positions on both sides of the main body is greater than the component arrangement density corresponding to the middle position of the main body.

[0012] In one embodiment, the spacings between adjacent scanning elements on the same axis are the same.

[0013] In one embodiment, it further includes:

[0014] A first controller is connected to all the emitting elements and is used to control all the emitting elements to light up in sequence;

[0015] The second controller is connected to the multiple receiving element groups and is used to activate the single receiving element groups in sequence. The receiving element group is composed of multiple receiving elements.

[0016] In one embodiment, the first controller comprises:

[0017] A first emission driving unit is connected to the first emission group and is used to drive each emission element in the first emission group to emit the first infrared light in sequence, wherein the first emission group is composed of a combination of local emission elements;

[0018] The second emission driving unit is connected to the second emission group, and is used to drive each emission element in the second emission group to emit the second infrared light in sequence; the emission rhythm of the first infrared light is synchronized with the emission rhythm of the second infrared light, and the waveform of the first infrared light is different from the waveform of the second infrared light; the second emission group is composed of emission elements other than the first emission group.

[0019] In one embodiment, the first transmitting driving unit includes:

[0020] A transmitting controller, used for outputting a fundamental wave;

[0021] An oscillator for outputting a carrier wave;

[0022] The modulator is connected to the transmitting controller and the oscillator, and is used for modulating the fundamental wave and the carrier wave, and outputting the first infrared light of the specified waveform to the first transmitting group.

[0023] In one embodiment, the second controller comprises:

[0024] A frequency-selective amplifier connected to all receiving element groups and used to amplify the signals collected by the receiving element groups at a specified frequency to obtain an amplified signal;

[0025] A filter, connected to the frequency-selective amplifier, for filtering the amplified signal to obtain a filtered signal;

[0026] An envelope detector, connected to the filter, is used to restore the fundamental wave from the filtered signal to obtain a recovered modulated signal;

[0027] The main controller is connected to the envelope detector and is used to determine whether the optical path is blocked according to the restored modulation signal.

[0028] The advantages or beneficial effects of the above technical solution include at least:

[0029] Each emitting element of the utility model can emit infrared light to the opposite axis range and the adjacent axis range, and each receiving element can receive the infrared light emitted by the emitting element on the opposite axis side, and can also receive the infrared light emitted by the emitting element on the adjacent axis side, so that the optical network formed by the infrared light is denser. Since the emitting and receiving angles of the utility model are larger than those of the traditional method, the optical network can also cover the edge area of ​​the touch screen, so that the touch recognition accuracy at the edge position of the touch screen is higher.

[0030] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the utility model and should not be regarded as limiting the scope of the utility model.

[0032] Figure 1 It is a schematic diagram of the optical network of a traditional axis scanning touch screen;

[0033] Figure 2 This is a schematic diagram of the optical network of the utility model's off-axis scanning touch screen;

[0034] Figure 3 This is a schematic diagram of the off-axis scanning touch screen in the "two-transmit and multiple-receive" mode of the utility model;

[0035] Figure 4 It is a module schematic diagram of the first transmitting driving unit and the second transmitting driving unit of the utility model;

[0036] Figure 5 This is a module schematic diagram of the second controller of the utility model;

[0037] Figure 6 It is a module schematic diagram of the second controller of the utility model when any light path is blocked.

[0038] In the figure: 1. first transmitting element; 2. first receiving element; 3. second transmitting element; 4. second receiving element; 5. first transmitting controller; 6. first oscillator; 7. first modulator; 8. second transmitting controller; 9. second oscillator; 10. second modulator; 11. frequency selective amplifier; 12. filter; 13. envelope detector; 14. sample and hold; 15. main controller. DETAILED DESCRIPTION

[0039] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0040] like Figure 1 As shown, traditional infrared touch screens usually use two sets of transmitting arrays and two sets of receiving arrays to achieve scanning purposes, that is, the transmitting array located on the long side of the touch screen emits infrared light, and the receiving array on the other long side of the touch screen directly opposite it receives the infrared light; similarly, another set of transmitting arrays is located on the short side of the touch screen, and the infrared light it emits is received by the receiving array on the other short side of the touch screen directly opposite it. This type of touch screen is called an axis scanning touch screen.

[0041] In the axis scanning touch screen, the light between the infrared transmitting array and the infrared receiving array forms an optical network in the X and Y directions in the touch area. However, due to the limitation of the transmitting / receiving angle of the receiving and transmitting infrared LEDs, the intersection points formed by the optical network (the intersection points formed by the light emitted by the X and Y axes) are sparser in the area closer to the transmitting / receiving LEDs. Small touch objects cannot be recognized in many areas at the edge of the touch screen, resulting in reduced accuracy. This defect is particularly obvious on large-size touch screens, and the customer interaction experience is extremely poor. If the blind area needs to be reduced, the arrangement density of the LEDs needs to be increased, resulting in a significant increase in cost.

[0042] In order to solve the above problems, this embodiment provides an off-axis scanning touch screen, which adds off-axis scanning on the basis of on-axis scanning without changing the number of LEDs, thereby increasing the scanning line density on the original basis and reducing the size of the optical network holes.

[0043] The off-axis scanning touch screen provided in this embodiment includes a main body and multiple scanning elements; wherein the main body is provided with multiple axial edges, each axial edge is provided with multiple scanning elements, the scanning elements are transmitting elements and / or receiving elements, and the two axial edges of the opposite axes need to be simultaneously provided with transmitting elements and receiving elements; the emission range of each transmitting element covers the axial edge directly facing it and the axial edge adjacent to it, and each receiving element is used to receive infrared light emitted by the transmitting element on the axial edge directly facing it and receive infrared light emitted by the transmitting element on the axial edge adjacent to it.

[0044] Specifically, the main body refers to the display screen main body, which can display a specified image. The internal structure and display principle of the main body have been disclosed in the prior art and will not be described in detail here. The scanning element refers to the transmitting element and the receiving element distributed around the display screen; the transmitting element can be an infrared transmitter, and the receiving element can be an infrared receiver.

[0045] The appearance shape and size of the main body can be set according to actual conditions. In this embodiment, the main body of the display screen is set as a rectangular structure; and the main body has a certain detection area, and its detection area can cover the entire display area of ​​the main body, or occupy part of the display area of ​​the main body. In this embodiment, the detection area of ​​the main body is the entire display area of ​​the main body.

[0046] The detection area of ​​the main body has two X-axis sides and two Y-axis sides around it. The X-axis side and the Y-axis side are perpendicular to and intersect each other. The two X-axis sides are parallel to each other, and the two Y-axis sides are parallel to each other.

[0047] In this embodiment, the four edges of the main body are used as the X-axis edges and the Y-axis edges to form a rectangular detection area. In order to distinguish the two X-axis edges and the two Y-axis edges, the two X-axis edges are named the first X-axis edge and the second X-axis edge, and the two Y-axis edges are named the first Y-axis edge and the second Y-axis edge.

[0048] Any type of scanning element can be distributed on any axis, that is, both the transmitting element and the receiving element can be arranged on the same axis; or, only the transmitting element can be arranged on the same axis, or only the receiving element can be arranged on the same axis; but it must be ensured that both the transmitting element and the receiving element are arranged on the two axis sides in a counter-axis relationship. For example:

[0049] The first arrangement: the scanning elements arranged on the first X-axis are all transmitting elements, the scanning elements arranged on the second X-axis are all receiving elements, the scanning elements arranged on the first Y-axis are all transmitting elements, and the scanning elements arranged on the second Y-axis are all receiving elements. Figure 1As shown, in order to distinguish the same type of scanning elements on different axis edges, all transmitting elements arranged on the first X-axis edge are called first transmitting elements 1, all receiving elements arranged on the second X-axis edge are called first receiving elements 2, all transmitting elements arranged on the first Y-axis edge are called second transmitting elements 3, and all receiving elements arranged on the second Y-axis edge are called second receiving elements.

[0050] The second arrangement mode: receiving elements and transmitting elements are arranged on the edge of the first X-axis, transmitting elements and receiving elements are arranged on the edge of the second X-axis, transmitting elements are arranged on the edge of the first Y-axis, and receiving elements are arranged on the edge of the second Y-axis.

[0051] The third arrangement method: receiving elements and transmitting elements are arranged on the first X-axis, transmitting elements and receiving elements are arranged on the second X-axis, receiving elements and transmitting elements are arranged on the first Y-axis, and receiving elements and transmitting elements are arranged on the second Y-axis.

[0052] The above examples only represent partial arrangements. Other arrangements are not given here one by one. However, it should be clear that the two opposite axis edges on the off-axis scanning touch screen must have both transmitting elements and receiving elements. This is equivalent to assuming that a transmitting element is provided on the first X-axis edge, then a receiving element is required on the second X-axis edge; assuming that a transmitting element is provided on the first Y-axis edge, then a receiving element is required on the second Y-axis edge; or there are both transmitting elements and receiving elements on the first X-axis edge, and both transmitting elements and receiving elements on the second X-axis edge.

[0053] In addition, each emitting element in this embodiment can emit infrared light to the receiving element on the side of the axis directly opposite to it, and can also emit infrared light to the receiving element on the side of the adjacent axis, so that an optical network is formed between the opposite axes, and an optical network can also be formed between adjacent axes (also called off-axis), so that the touch screen can realize coaxial scanning and off-axis scanning at the same time, so as to increase the density of the optical network. Figure 2 As shown, Figure 2 The density of the optical network is obviously higher than Figure 1 The optical network density of traditional touch screens is high, which can greatly improve the recognition accuracy of touch screens.

[0054] The models and specifications of the emitting elements on different axis sides are the same, and the models and rules of the receiving elements on different axis sides are the same, ensuring that the infrared light emitted by each emitting element can be received by the receiving element on the opposite axis, and can also be received by the receiving element on the adjacent axis (also called off-axis).

[0055] In this embodiment, the total number of elements on each axis may not be equal. The total number of elements refers to the sum of all transmitting elements and receiving elements on the same axis, where the number of transmitting elements on the axis may be zero, or the number of receiving elements may be zero.

[0056] It should be noted that, assuming that all scanning elements arranged on a certain axis are receiving elements, the total number of elements on the axis is the number of all receiving elements on the axis. For example, the total number of elements on the first X-axis is N1, and the total number of elements on the second X-axis is M1, N1≠M1; or, the total number of elements on the first X-axis is N2, and the total number of elements on the first Y-axis is M2, N2≠M2.

[0057] In some embodiments, the total number of components on the two opposite axis edges may also be the same, that is, the total number of components on the first X-axis edge is equal to the total number of components on the second X-axis edge. Even the total number of components on the two axis edges of adjacent axes may be the same. The design of the total number of components on each axis edge can be set according to actual needs, and will not be listed here one by one.

[0058] In order to increase the optical network density at the edge of the touch screen, the component arrangement density corresponding to the edge positions on both sides of the main body can be set greater than the component arrangement density corresponding to the middle position of the main body, which is equivalent to the gap between the scanning elements corresponding to the edge positions on both sides of the main body being relatively small, while the gap between the scanning elements located in the middle position of the main body is relatively large, making the optical network distributed on the edges of both sides of the main body denser, thereby improving the scanning and recognition accuracy of the edge positions.

[0059] In some embodiments, the spacing between adjacent scanning elements on the same axial edge is the same, that is, the scanning elements are evenly distributed on the axial edge. In this case, increasing the number of scanning elements on the axial edge also increases the optical network density.

[0060] Since the emission and receiving angles in this embodiment are relatively wide, all infrared light beams cover to form an optical network, making the optical paths in the optical network dense, which can improve the recognition accuracy. Especially at the edge of the touch screen, the optical path coverage is relatively dense and the blind spots are relatively small, which can greatly improve the touch recognition accuracy at the edge of the touch screen.

[0061] In order to further improve the density of the optical path at the edge of the touch screen, the distance between the leftmost scanning element and the rightmost scanning element located on the X-axis side is equal to the maximum horizontal distance of the touch screen detection area, and the distance between the leftmost scanning element and the rightmost scanning element located on the Y-axis side is equal to the maximum vertical distance of the touch screen detection area, so that the positions of the transmitting elements and the receiving elements cover the entire detection area as much as possible, and the transmitting elements close to the edge of the detection area emit infrared light, which is received by the receiving elements on the opposite axis and at the same time received by the receiving elements on the adjacent axis, which can improve the density of the optical path at the edge and improve the recognition accuracy of the touch screen at the edge.

[0062] For large-sized touch screens, since the distance between the left and right sides of the touch screen is relatively large, if the traditional axis scanning method is used, the infrared light emitted by the transmitting element must be received by the axis receiving element, which is relatively difficult and the accuracy cannot be improved. Compared with the traditional axis recognition touch screen, with the same number of LEDs, the off-axis scanning touch screen of this embodiment can recognize smaller objects on a large-sized touch screen, which is equivalent to the user being able to write smaller fonts on the touch screen; it can also greatly improve the writing and drawing effects of the edges, so that the recognition accuracy of the touch screen is further improved.

[0063] The off-axis scanning touch screen of this embodiment also includes a first controller and a second controller. The first controller is connected to all the transmitting elements and is used to control all the transmitting elements to light up in sequence. The second controller is connected to multiple groups of receiving elements and is used to activate a single group of receiving elements each time, and multiple groups of receiving elements are activated in sequence. The receiving element group is composed of local receiving elements. This is equivalent to grouping multiple receiving elements on the edges of the X-axis and the Y-axis into groups in advance. Figure 3 As shown, Figure 3 A plurality of black receiving elements framed by a virtual frame constitutes a receiving element group.

[0064] The first controller controls the emitting elements on the X-axis and Y-axis to light up one by one in turn, and each lit emitting element emits infrared light to the receiving element on the opposite axis and the receiving element on the opposite axis. At the same time, the second controller activates each group of receiving elements in turn to collect signals, and repeats the aforementioned signal collection process until all receiving element groups are activated and sampled; this scanning method is called the "one send, multiple receive" mode. When an opaque object is located in the detection area of ​​the touch screen, the opaque object will block multiple detection light paths in the optical network during the scanning process. According to the signal collection of the receiving element, the position of the opaque object in the detection area can be identified and the area of ​​the opaque object can be calculated. Among them, the method of identifying the position of the opaque object in the detection area according to the signal collection of the receiving element can be implemented according to the infrared detection principle, which has been disclosed in the prior art and will not be described in detail here.

[0065] For example, there are receiving element groups A to G and transmitting elements n to m. The scanning method is to turn on the infrared receiving element group A, drive the transmitting element n for a period of time, turn off the transmitting element n, drive the transmitting element n+1 for a period of time, turn off the transmitting element n+1, ..., and so on, until the transmitting element m is turned off and the infrared receiving element group A is turned off; then the infrared receiving element group B is turned on, and the transmitting elements n to m are driven in sequence; and so on, until the infrared receiving element group G is turned off and the infrared touch frame completes the scan.

[0066] Alternatively, there are receiving element groups A to G and transmitting elements n to m, and the scanning method is to drive the receiving element group A and light up the transmitting elements n to m in sequence; after the transmitting elements n to m are lit up in sequence, the receiving element group A is turned off, the receiving element group B is turned on, and then the transmitting elements n to m are lit up in sequence, and so on, until the receiving element G is turned off and the infrared touch frame completes the scan.

[0067] As the scanning cycle of the infrared touch frame is shorter, more touch point data is calculated per unit time, and the touch track is more accurate, which brings positive improvements to the writing experience and touch frame performance. In order to shorten the scanning cycle, the traditional solution is to increase the number of infrared receiving elements. However, for each additional infrared receiving element, the hardware cost of signal processing is greatly increased, and the burden on the MCU is also increased, which poses risks.

[0068] In order to shorten the scanning cycle and improve the touch recognition accuracy, a "two-transmit and multiple-receive" scanning method is also proposed, that is, two modulation waves are output by the transmitting driving unit to drive two infrared transmitting elements at the same time, and the infrared light is received by multiple infrared receiving elements of a receiving element group, which greatly improves the overall scanning efficiency and plays a significant role in improving the performance of the infrared touch frame.

[0069] Specifically, a first transmitting drive unit and a second transmitting drive unit are built into the first controller. The first transmitting drive unit is connected to the first transmitting group and is used to drive the first transmitting group to emit a first infrared light. The first transmitting group is composed of a combination of local transmitting elements. The second transmitting drive unit is connected to the second transmitting group and is used to drive each transmitting element in the second transmitting group to emit a second infrared light in sequence. The emission rhythm of the first infrared light is synchronized with the emission rhythm of the second infrared light, and the waveform of the first infrared light is different from the waveform of the second infrared light. The second transmitting group is composed of a combination of transmitting elements other than the first transmitting group.

[0070] This is equivalent to pre-dividing all the transmitting elements into two categories in this embodiment, where some transmitting elements are classified into the first transmitting group and the remaining transmitting elements are classified into the second transmitting group. The division rule of the first transmitting group and the second transmitting group can be an interval mark. For example, Figure 3 As shown, the transmitting elements A arranged at odd positions are marked as transmitting elements of the first transmitting group, and the transmitting elements B arranged at even positions are marked as transmitting elements of the second transmitting group.

[0071] During scanning, the first transmitting driving unit drives one transmitting element in the first transmitting group to emit the first infrared light, and at the same time, the second transmitting driving unit drives one transmitting element in the second transmitting group to emit the second infrared light, that is, the two transmitting elements are activated at the same time, and the first infrared light and the second infrared light are emitted at the same time. When the two infrared lights are emitted at the same time, each group of receiving elements is controlled to be turned on in sequence, so that all receiving elements in each group of receiving elements can receive two infrared lights with different carrier frequencies at the same time, and after signal processing, the blocked light path can be quickly determined, and the coordinates and width and height of the opaque object can be calculated, thereby shortening the scanning cycle of the touch screen.

[0072] Taking "two transmit and multiple receive" as an example, there are receiving element groups a~g, the first transmitting group is n, including n1, n2...ni, and the second transmitting group is m, including m1, m2...mi; the scanning method is to drive the receiving element group a, light up the transmitting elements n1 and m1 at the same time, then turn off the transmitting elements n1 and m1, and then light up the transmitting elements n2 and m2...and so on, until the transmitting elements ni and mi are turned off; turn off the receiving element group a, turn on the receiving element group a+1, and then repeat lighting up the transmitting elements n1 and m1 at the same time...and so on, until the receiving element g is turned off, and the infrared touch frame completes the scan.

[0073] Among them, Figure 4 As shown, the first transmission driving unit for driving the first transmission group includes:

[0074] The first transmitting controller 5 refers to a device or module used in an electronic device or system to control and adjust the transmission of a fundamental wave signal, and is used to output a fundamental wave. In this embodiment, the transmitting drive signal is used as the fundamental wave, and the transmitting drive signal can be a square wave with a period of 1 to 5 us and a duty cycle of 1 to 5 us. 1 / 3 , peak-to-peak value 1 ~ 5V;

[0075] The first oscillator 6 refers to a device that generates a periodic signal with a specific frequency and amplitude. In this embodiment, it is used to output a carrier wave. In this embodiment, two different fixed-frequency signals that are much larger than the fundamental frequency can be selected as carrier waves, wherein the frequency of the fixed-frequency signal can be more than eight times the fundamental frequency;

[0076] The first modulator 7 refers to a device that encodes information (such as audio, video or data) onto a carrier signal. In this embodiment, the first modulator 7 is connected to the first transmission controller 5 and the first oscillator 6. The first modulator 7 performs amplitude modulation on the fundamental wave and the carrier to modulate the modulation wave f1. The modulation wave f1 is applied to the first infrared light of the specified waveform of the first transmission group output.

[0077] It should be noted that the internal circuit structures and working principles of the first transmission controller 5 , the first oscillator 6 and the first modulator 7 have been disclosed in the prior art and will not be described in detail here.

[0078] Similarly, the second transmission driving unit for driving the second transmission group also includes a second transmission controller 8, a second oscillator 9 and a second modulator 10, wherein the carrier selected by the second transmission driving unit is different from the carrier selected by the first transmission driving unit, and the modulation wave f2 is modulated by the second modulator 10, and the modulation wave f2 is applied to the second transmission group to output a second infrared light with a different waveform.

[0079] like Figure 5 As shown in the figure, when the infrared receiving element receives two infrared lights with different carrier frequencies at the same time, the received signal is pre-processed and divided into two parts. After frequency selection amplification, filtering, envelope detection, sampling and holding, the output waveform has two situations, such as Figure 6 As shown, one is the case where there is no light path blocked, and the output waveform is close to the fundamental wave, that is, the original emission drive signal; the other is the case where there is a light path blocked, and the output waveform is DC, indicating that the light path is blocked. Based on these two situations, the main controller 15 can quickly determine the blocked light path, and can determine the specific location where the blockage occurs by comparing the signal strength or existence of the two carrier frequencies, thereby determining the coordinates and width and height of the opaque object.

[0080] Specifically, Figure 5 As shown, the second controller achieves the purpose of the above-mentioned blocked light path judgment through its built-in frequency selective amplifier 11, filter 12, envelope detector 13, sample holder 14 and main controller 15.

[0081] The frequency selective amplifier 11 is connected to all receiving element groups and is used to amplify the signals collected by the receiving element groups at a specified frequency to obtain an amplified signal;

[0082] The filter 12 is connected to the frequency-selective amplifier 11 and is used to filter the amplified signal, suppress other frequency signals except the designated frequency signal, and obtain a filtered signal;

[0083] The envelope detector 13 is connected to the filter 12 and is used to restore the fundamental wave from the filtered signal to obtain a restored modulated signal;

[0084] A sample-and-hold device 14, connected to the envelope detector 13, for holding the recovered modulation signal;

[0085] The main controller 15 is connected to the envelope detector 13 and is used to determine whether the optical path is blocked according to the restored modulation signal.

[0086] This embodiment adopts a "two-transmit and multiple-receive" scanning method, and outputs two modulated waves through the first transmitting driving unit and the second transmitting driving unit, respectively driving two infrared transmitting tubes at the same time to emit the first infrared light and the second infrared light, and the first infrared light and the second infrared light emitted at the same time are received by multiple infrared receiving elements of an infrared receiving element group, and the infrared receiving element sends the electrical signal for signal amplification, filtering, detection and other signal processing after receiving the electrical signal, and the processed signal is then sent to the main controller 15 for blocking light path judgment, calculating and obtaining the blocking point coordinates and width and height, which can greatly improve the overall scanning efficiency and play a significant role in improving the performance of the infrared touch screen.

[0087] In some embodiments, a "multi-transmit and multi-receive" scanning method is also proposed, that is, multiple transmitting driving units output multiple modulation waves, and simultaneously drive multiple infrared transmitting elements to emit infrared light of multiple different carriers. After each group of infrared receiving elements receives multiple infrared lights, the main controller 15 performs light path blocking judgment to further improve the scanning efficiency. The scanning method of "multi-transmit and multi-receive" is the same as the aforementioned scanning method of "two-transmit and multi-receive" in principle, and will not be described in detail here.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0089] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A different-axis scanning touch screen, characterized in that: It includes a main body and a plurality of scanning elements; The main body is provided with a plurality of axial edges, each of which is provided with a plurality of scanning elements, the scanning elements being emitting elements and / or receiving elements, and the emitting elements and the receiving elements must be present on two axial edges of the opposite axis at the same time; The emission range of each emitting element covers the axial edge facing it and the axial edge adjacent to it, and each receiving element is used to receive the infrared light emitted by the emitting element on the axial edge facing it and the infrared light emitted by the emitting element on the axial edge adjacent to it.

2. The off-axis scanning touch screen according to claim 1, characterized in that: The transmitting element and the receiving element are both arranged on the same axis side; or, only the transmitting element is arranged on the same axis side; or, only the receiving element is arranged on the same axis side.

3. The off-axis scanning touch screen according to claim 1, characterized in that: The total number of elements on each of the axis edges is not equal, and the total number of elements refers to the sum of the number of all the transmitting elements and the receiving elements on the same axis edge.

4. The off-axis scanning touch screen according to claim 1, characterized in that: The total number of elements located on the two opposite axial sides is the same, and the total number of elements refers to the sum of the numbers of all the transmitting elements and the receiving elements on the same axial side.

5. The off-axis scanning touch screen according to claim 1, characterized in that: The component arrangement density corresponding to the edge positions on both sides of the main body is greater than the component arrangement density corresponding to the middle position of the main body.

6. The off-axis scanning touch screen according to claim 1, characterized in that: The spacings between adjacent scanning elements on the same axis are the same.

7. The off-axis scanning touch screen according to claim 1, characterized in that: Also includes: A first controller, connected to all the emitting elements, for controlling all the emitting elements to light up in sequence; The second controller is connected to the plurality of receiving element groups and is used to sequentially activate a single group of the receiving element groups, wherein the receiving element group is composed of a plurality of the receiving elements.

8. The off-axis scanning touch screen according to claim 7, characterized in that: The first controller comprises: A first emission driving unit is connected to the first emission group, and is used to drive each of the emission elements in the first emission group to emit first infrared light in sequence, wherein the first emission group is composed of a local combination of the emission elements; The second emission driving unit is connected to the second emission group, and is used to drive each of the emission elements in the second emission group to emit the second infrared light in sequence; the emission rhythm of the first infrared light is synchronized with the emission rhythm of the second infrared light, and the waveform of the first infrared light is different from the waveform of the second infrared light; the second emission group is composed of the emission elements other than the first emission group.

9. The off-axis scanning touch screen according to claim 8, characterized in that: The first transmitting driving unit comprises: A transmitting controller, used for outputting a fundamental wave; An oscillator for outputting a carrier wave; A modulator is connected to the transmitting controller and the oscillator, and is used to modulate the fundamental wave and the carrier wave, and output the first infrared light of a specified waveform to the first transmitting group.

10. The off-axis scanning touch screen according to claim 9, characterized in that: The second controller comprises: A frequency selective amplifier connected to all the receiving element groups, and used to amplify the signals collected by the receiving element groups at a specified frequency to obtain an amplified signal; A filter, connected to the frequency selective amplifier, for filtering the amplified signal to obtain a filtered signal; An envelope detector, connected to the filter, for restoring the fundamental wave from the filtered signal to obtain a restored modulated signal; A main controller is connected to the envelope detector and is used to determine whether the optical path is blocked according to the restored modulation signal.

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