Circuit board of infrared touch frame, infrared touch frame and infrared touch screen

Abstract

The utility model relates to a circuit board of an infrared touch frame, the infrared touch frame and an infrared touch screen. The circuit board of the infrared touch frame comprises a plurality of connected PCBs, the PCBs are fixed to the periphery of the screen module through sectional materials, and circuit elements and signal lines are arranged on the PCBs; the PCB comprises a lamp tube surface side facing the screen module and a non-lamp tube surface side far away from the screen module, an infrared lamp tube is arranged on the lamp tube surface side, and the infrared lamp tube faces the screen module; the signal line is arranged on the non-lamp tube surface side of the PCB, the lamp tube surface side is provided with a shielding layer, and the shielding layer is used for shielding signal interference of the screen module; according to the technical scheme, the signal lines which are easily interfered by high-frequency signals are arranged on the non-lamp-tube surface of the PCB and are arranged far away from an interference source, and the protection layer is arranged, so that the interference of the interference source on analog signals in the signal lines is reduced, and normal use of the infrared touch screen is ensured.

Description

Technical Field

[0001] The present application relates to the field of infrared touch control technology, and in particular to a circuit board of an infrared touch frame, an infrared touch frame and an infrared touch screen. Background Art

[0002] The infrared touch frame uses the emission and reception of infrared lamps to perform touch positioning and recognition. The infrared lamps are installed on the circuit board. Signal lines are arranged on the infrared lamp surface of the circuit board. Since the distance between the lamp surface of the circuit board and the screen module (OC module) is relatively close, and the profile material used to fix the circuit board generally does not have the ability to shield the signal, the high-frequency digital signal of the screen module is easily coupled to the signal in the signal line on the lamp surface of the circuit board, thereby interfering with the signal, causing signal distortion, poor signal-to-noise ratio, etc., and even causing signal failure, seriously affecting the normal use of the infrared touch screen. Summary of the invention

[0003] The purpose of the present application is to solve one of the above-mentioned technical defects and to provide a circuit board of an infrared touch frame, an infrared touch frame, and an infrared touch screen to reduce the interference of the high-frequency signal of the screen module on the analog signal on the circuit board.

[0004] A circuit board of an infrared touch frame, comprising: a plurality of connected PCB boards, wherein the PCB boards are fixed around a screen module through profiles, and circuit elements and signal lines are arranged on the PCB boards;

[0005] The PCB board includes a lamp tube surface side facing the screen module and a non-lamp tube surface side away from the screen module, and an infrared lamp tube is arranged on the lamp tube surface side, and the infrared lamp tube faces the screen module;

[0006] The signal line is arranged on the non-lamp tube surface side of the PCB board, and a shielding layer is arranged on the lamp tube surface side, and the shielding layer is used to shield the signal interference of the screen module.

[0007] In one embodiment, the signal line includes an analog signal line and a digital signal line, and the analog signal line is arranged on the non-lamp tube surface side.

[0008] In one embodiment, a shielding layer is provided on one side of the lamp tube surface of the PCB board, and the shielding layer is distributed along the signal line.

[0009] In one embodiment, an isolation layer is further provided between the non-lamp tube surface of the PCB board and the signal line.

[0010] In one embodiment, the shielding layer includes a copper metal layer covering the lamp tube surface of the PCB board; wherein the copper metal layer covers the largest area.

[0011] An infrared touch frame comprises: a circuit board of the infrared touch frame; the circuit board comprises a main board and a plurality of sub-boards; wherein the main board and the sub-boards are cascade-connected via signal lines.

[0012] In one embodiment, the sub-board includes a plurality of transmitting boards connected in series and a plurality of receiving boards connected in series.

[0013] In one embodiment, the main board is connected to each transmitting board and receiving board through a digital signal line, and each receiving board is connected to the main board after being cascaded through an analog signal line.

[0014] In one embodiment, the mainboard is provided with a signal processing circuit, an A / D sampling circuit and an MCU which are connected in sequence; wherein the signal processing circuit is connected to an analog signal line, and the MCU is connected to a data signal line.

[0015] An infrared touch screen comprises: a display screen and the infrared touch frame.

[0016] The technical solution of this application has the following beneficial effects:

[0017] The signal lines that are easily interfered by high-frequency signals are arranged on the non-lamp tube surface of the PCB board, away from the interference source, and a shielding layer is set on the lamp tube surface side to shield the signal interference of the screen module, thereby reducing the interference of the signal in the signal line by the interference source and ensuring the normal use of the infrared touch screen.

[0018] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 This is a cross-sectional view of a conventional circuit board installation;

[0021] Figure 2 is a schematic plan view of a PCB board of an embodiment;

[0022] Figure 3 is a schematic cross-sectional view of a circuit board according to an embodiment;

[0023] Figure 4 is a structural block diagram of an infrared touch frame of an embodiment;

[0024] Figure 5 is an electrical structure diagram of an infrared touch frame according to an embodiment. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0026] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, but does not exclude the presence or addition of one or more other features, integers, steps, operations.

[0027] The technical solution of the present application is an improvement solution for the circuit board of the infrared touch frame, such as Figure 1 As shown, Figure 1 It is a cross-sectional view of a conventional circuit board installation. As shown in the figure, a PCB board 11 is fixed around a screen module 30 by a profile 20. A circuit element 110 and an analog signal line 12 are provided on the PCB board 11. Since the PCB board 11 is close to the screen module 30 on the side of the lamp tube surface 11a facing the screen module 30, the high-frequency signal generated by it is easy to interfere with the signal transmitted in the signal line 12, causing signal distortion, poor signal-to-noise ratio, and even signal failure. For this reason, the present application designs a circuit board for an infrared touch frame to reduce the interference of the signal on the circuit board with the high-frequency signal of the screen module 30.

[0028] The infrared touch frame of the present application may include a plurality of cascade-connected circuit boards, which include a plurality of connected PCB boards 11. For the structure on each PCB board 11, refer to Figure 2 As shown, Figure 2 1 is a plan view of a PCB board of an embodiment, on which an infrared lamp tube 13 is arranged. The upper figure is a view from the side of the lamp tube surface 11a, and the lower figure is a view from the side of the non-lamp tube surface 11b. An array of infrared lamp tubes 13 is arranged on the side of the lamp tube surface 11a of the PCB board 11, and these infrared lamp tubes 13 include infrared transmitting tubes or infrared receiving tubes; at the same time, the signal line 12 used by the circuit board is arranged on the side of the non-lamp tube surface 11b of the PCB board 11; Figure 3 As shown, Figure 3 is a schematic cross-sectional view of a circuit board of an embodiment, which is Figure 2In the AA view, a shielding layer 15 is provided on the lamp tube surface 11a side of the PCB board 11, and the shielding layer 15 is distributed along the signal line 12; the high-frequency signal of the screen module 30 can be shielded by the shielding layer 15, thereby reducing the interference effect on the signal line 12 on the non-lamp tube surface 11b side;

[0029] In one embodiment, the signal line 12 is covered with a protective layer 121 , which is mainly a paint layer used to protect the signal line 12 . The circuit element 110 is also located on the side of the non-lamp tube surface 11 b .

[0030] Furthermore, an isolation layer 16 can be provided between the non-lamp tube surface 11b of the PCB board 11 and the signal line 12. The isolation layer 16 has the same function as the shielding layer 15, which is to shield and isolate the high-frequency signal radiated from the screen module 30, thereby protecting the signal of the signal line 12 from interference.

[0031] In this embodiment, the signal line may include an analog signal line and a digital signal line, wherein the analog signal line is mainly used to transmit analog signals, such as an analog signal converted from an infrared light signal received by an infrared receiving tube, and the digital signal line is mainly used to transmit digital signals, such as a control signal for controlling an infrared lamp to scan.

[0032] In the above embodiment, the shielding layer 15 can be distributed along the signal line 12, mainly depending on the area ratio occupied by the signal line 12. If the ratio is low, the shielding layer 15 can be partially covered. If the ratio is large, full coverage of the non-lamp tube surface 11b can be considered.

[0033] Preferably, the shielding layer 15 may include a copper metal layer covering the lamp tube surface 11a of the PCB board 11, wherein the copper metal layer can cover the maximum area, that is, the copper metal layer covers the entire lamp tube surface 11a; by arranging the signal line 12 at a position away from the non-lamp tube surface 11b of the interference source and covering the maximum area on one side of the lamp tube surface 11a, the copper metal layer on the non-lamp tube surface 11b of the PCB board 11 is also covered with a protective coating.

[0034] The technical solution of the above-mentioned embodiment can effectively isolate the influence of interference sources on the signal line 12, such as the analog signal transmitted in the analog signal line and the control signal transmitted on the digital signal line, and especially isolate the interference of the high-frequency signal of the screen module 30 on the analog signal transmitted on the analog signal line, thereby ensuring the normal use of the infrared touch screen.

[0035] The following describes embodiments of an infrared touch frame and an infrared touch screen.

[0036] The infrared touch frame provided in the present application includes the circuit board of the infrared touch frame provided in the present embodiment; the infrared touch screen provided in the present application includes the display screen and the above-mentioned infrared touch frame. Figure 4 As shown, Figure 4 It is a structural block diagram of an infrared touch frame of an embodiment, wherein the circuit board includes a main board and a plurality of connected sub-boards, and each sub-board is connected to the main board through a signal line; in the figure, the main board is communicated with sub-board ①, sub-board ②...sub-board ⑧, etc. through signal lines; wherein, exemplarily, the main board is integrated on sub-board ①, and of course, an independent main board can also be designed.

[0037] In one embodiment, reference Figure 5 As shown, Figure 5 The invention is an electrical structure diagram of an infrared touch frame of an embodiment, wherein a main board is provided with a signal processing circuit, an A / D sampling circuit and an MCU which are connected in sequence; wherein the signal processing circuit is connected to an analog signal line, and the MCU is connected to a digital signal line; the transmitting board is connected to an infrared transmitting tube, and the receiving board is connected to an infrared receiving tube; the MCU can send a control signal to the sub-board through the digital signal line, and for the transmitting board, it can control the infrared transmitting tubes T1, T2 ..., Tn to emit infrared light through the control signal; for the receiving board, it can control the infrared receiving tubes R1, R2 ..., Rm to receive infrared light signals through the control signal, and the infrared receiving tube on the receiving board converts the infrared light signal into an analog signal, which is amplified by a triode Q, and then loaded into the analog signal line and transmitted to the signal processing circuit of the main board, and the analog signal is sampled by the A / D sampling circuit to obtain a digital signal which is transmitted to the MCU for touch positioning calculation.

[0038] In the above embodiment, the signal processing circuit, A / D sampling circuit, MCU of the main board, and the related circuit elements 110 of the sub-board are arranged on the non-lamp tube surface 11b side of the PCB board, and the PCB boards of each sub-board are connected through a connector; the related components and signal lines of the infrared touch frame are arranged on the non-lamp tube surface of the PCB board, so that the signal in the signal line is free from interference, ensuring the normal use of the infrared touch screen.

[0039] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0040] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A circuit board of an infrared touch frame, characterized in that: include: A plurality of connected PCB boards, wherein the PCB boards are fixed around the screen module through profiles, and the PCB boards are provided with circuit elements and signal lines; The PCB board includes a lamp tube surface side facing the screen module and a non-lamp tube surface side away from the screen module, and an infrared lamp tube is arranged on the lamp tube surface side, and the infrared lamp tube faces the screen module; The signal line is arranged on the non-lamp tube surface side of the PCB board, and a shielding layer is arranged on the lamp tube surface side, and the shielding layer is used to shield the signal interference of the screen module.

2. The circuit board of the infrared touch frame according to claim 1, characterized in that: The signal line includes an analog signal line and a digital signal line, and the analog signal line is arranged on the non-lamp tube surface side.

3. The circuit board of the infrared touch frame according to claim 1, characterized in that: A shielding layer is provided on one side of the lamp tube surface of the PCB board, and the shielding layer is distributed along the signal line.

4. The circuit board of the infrared touch frame according to claim 1, characterized in that: An isolation layer is also provided between the non-lamp tube surface of the PCB board and the signal line.

5. The circuit board of the infrared touch frame according to claim 1, characterized in that: The shielding layer includes a copper metal layer covering the lamp tube surface of the PCB board; wherein the copper metal layer covers the largest area.

6. An infrared touch frame, characterized in that: include: A circuit board of an infrared touch frame according to any one of claims 1 to 5, wherein the circuit board comprises a main board and a plurality of sub-boards; wherein the main board and each sub-board are cascade-connected via a signal line.

7. The infrared touch frame according to claim 6, characterized in that: The sub-board includes a plurality of transmitting boards connected in series and a plurality of receiving boards connected in series.

8. The infrared touch frame according to claim 7, characterized in that: The main board is connected to each transmitting board and receiving board through a digital signal line, and each receiving board is connected to the main board after being cascade-connected through an analog signal line.

9. The infrared touch frame according to claim 7, characterized in that: The mainboard is provided with a signal processing circuit, an A / D sampling circuit and an MCU which are connected in sequence; wherein the signal processing circuit is connected to an analog signal line, and the MCU is connected to a data signal line.

10. An infrared touch screen, characterized in that: include: A display screen and the infrared touch frame as described in any one of claims 6 to 9.

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