An external capacitive touch screen

Abstract

This invention relates to the field of capacitive touchscreen technology, specifically an external capacitive touchscreen, including a protective cover. A capacitive touch film is mounted on one side of the protective cover. The structure formed by the protective cover and the capacitive touch film is fixedly connected to a support. The capacitive touch film has four limiting parts on the side opposite to the protective cover for restricting the position of the LCD TV. The limiting parts are fixedly connected to the support. An adjustable lifting part for supporting the LCD TV is connected to the limiting part through a connector. The ends of the two lifting parts located on the upper side of the protective cover are fixedly connected to a locking part for locking onto the back of the LCD motor. This invention has the following advantages: For TV users, they do not need to replace a TV; they can simply buy a capacitive touchscreen and connect it to their existing LCD TV to achieve touch functionality.

Description

Technical Field

[0001] This invention is an external capacitive screen, belonging to the field of capacitive touch screens. Background Technology

[0002] Currently, capacitive touchscreens are supplied to OEMs as components. Therefore, each project requires a custom-designed, custom-molded capacitive touchscreen tailored to the specific machine structure of each OEM. The OEM then manufactures the finished product and markets it, placing orders with touchscreen manufacturers based on market feedback. This process, from design to trial production to mass production, is very lengthy. Large-size (32 inches and above) capacitive touchscreens are primarily used in advertising displays, conference systems, and educational blackboards, while touchscreens are rarely found in televisions. This significantly impacts product sales and market penetration. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an external capacitive touchscreen to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an external capacitive touchscreen, comprising a protective cover plate, a capacitive touch film mounted on one side of the protective cover plate, a flexible flat cable electrically connected to the capacitive touch film between the protective cover plate and the capacitive touch film, and a control card for processing touch signals electrically connected to the other end of the flexible flat cable. The control card is electrically connected to an LCD TV via a USB data cable. The structure formed by the protective cover plate and the capacitive touch film is fixedly connected to a support portion. Four limiting portions for restricting the position of the LCD TV are provided on the side of the capacitive touch film away from the protective cover plate. The limiting portions are connected to the support portion. The limiting part is fixedly connected to the limiting part, and the adjustable supporting part for supporting the LCD TV is connected to the limiting part through the connecting piece. The upper surface of the two supporting parts located on the lower side of the protective cover plate has a vertically arranged first threaded hole on the side away from the limiting part. The first threaded hole is threaded with a first fixing screw that contacts the bottom of the LCD TV. The ends of the two supporting parts located on the upper side of the protective cover plate are fixedly connected with a snap-fit ​​part for snapping onto the back of the LCD motor. The snap-fit ​​part has a second threaded hole at the lower part of the side facing the LCD TV. The second threaded hole is threaded with a second fixing screw that contacts the back of the LCD TV.

[0005] Specifically, the support part is a strip plate, which is arranged vertically, and both ends of the strip plate are fixedly connected to limiting parts, which are arranged perpendicular to the strip plate.

[0006] Specifically, the support is a rectangular frame, and the structure formed by the protective cover and the capacitive touch film is installed inside the rectangular frame.

[0007] Specifically, a shielding film is installed on the side of the capacitive touch film that is away from the protective cover plate, and the shielding film is a conductive film.

[0008] Specifically, the connector includes a connecting rod. The limiting part has a cavity on the side away from the protective cover. One end of the lifting part is inserted into the cavity. The side of the lifting part away from the limiting part has two symmetrically arranged circular cavities. The circular cavities are arranged along the length of the lifting part. The end of the lifting part in the cavity has two symmetrically arranged guide holes that communicate with the two circular cavities respectively. The diameter of the guide holes is smaller than the diameter of the circular cavities. A connecting rod is inserted into the guide holes. One end of the connecting rod is fixed to the inner wall of the cavity. The other end of the connecting rod extends into the circular cavity and is fixedly connected to a rubber plug. The rubber plug is slidably installed in the circular cavity. A detachable sealing head is installed on the side of the circular cavity away from the guide holes.

[0009] Specifically, the sealing head is fixed to one side of the carrier plate, and the carrier plate is fixedly connected to the lifting part by two screws.

[0010] Specifically, a positioning hole is provided at the location where the connecting rod is installed in the cavity, and the end of the connecting rod away from the rubber plug is fixed in the positioning hole.

[0011] Specifically, the upper surfaces of the two limiting parts located on the lower side of the protective cover and the lower surfaces of the two limiting parts located on the upper side of the protective cover are all provided with strip grooves. The strip grooves are arranged along the length of the limiting parts and communicate with the cavity. The side of the supporting part facing the strip groove is provided with a plurality of vertically arranged threaded blind holes. The threaded blind holes are staggered with the circular cavity. The threaded blind holes are internally threaded with threaded posts for contacting the surface of the LCD TV. The threaded posts are provided with an internal hexagonal hole for matching an internal hexagonal wrench at the middle position of the side of the threaded blind hole.

[0012] Specifically, the limiting part has a rectangular cross-section, the cavity has a rectangular cross-section, and the lifting part has a rectangular cross-section.

[0013] The beneficial effects of this invention are:

[0014] 1. Capacitive touchscreens can be sold directly to users, who can choose whether or not to include them. Especially for TV users, they don't need to replace their TVs; they can simply buy a capacitive touchscreen and connect it to their existing LCD TVs to enable touch functionality. The capacitive touchscreen, consisting of a protective cover and a capacitive touch film, is connected to a control card that processes touch signals via a flexible flat cable, and then the signals are transmitted to the LCD TV via a USB cable.

[0015] 2. After removing the sealing head, the cavity is connected to the outside. Pulling the supporting part causes relative movement between the supporting part and the limiting part. At this time, the rubber plug at the end of the connecting rod slides in the cavity relative to the supporting part. When the size of the structure formed by the supporting part and the limiting part meets the thickness of the LCD TV, the sealing head seals the cavity again. The rubber plug is restricted in the cavity under the action of pressure difference, completing the adjustment of the position of the supporting part. This meets the needs of LCD TVs of different thicknesses and expands the scope of application. By hiding the structure connecting the supporting part and the limiting part in the space within the supporting part and the limiting part, it is beneficial to improve the aesthetics of the appearance.

[0016] 3. Install the capacitive touch screen, consisting of a protective cover and a capacitive touch film, into the structure formed by the support and limiting parts. Then, place the capacitive touch screen, consisting of a protective cover and a capacitive touch film, on the front of the LCD TV, and position the LCD TV within the space formed by the four limiting parts. Then, tighten the first and second fixing screws so that both the first and second fixing screws are in contact with the surface of the LCD TV, thus completing the assembly of the capacitive touch screen. This process is convenient and quick.

[0017] 4. When using a structure formed by a strip plate and a limiting part, the snap-fit ​​part can be hung on a hook on the wall, so that the whole assembly of the capacitive touch screen and the LCD TV can be suspended on the wall.

[0018] 5. Tighten the multiple threaded posts on the support part so that the length of the multiple threaded posts exposed outside the threaded holes varies with the undulations of the LCD TV surface, and the top of the threaded posts contacts the LCD TV surface, thereby expanding the support range for the LCD TV and improving the stability of the assembly. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of an external capacitive touchscreen according to the present invention;

[0021] Figure 2 This is a diagram illustrating one embodiment of an external capacitive touchscreen according to the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the assembly of the supporting part and the limiting part in an external capacitive screen according to the present invention;

[0024] Figure 5 This is a longitudinal cross-sectional view of the support part in an external capacitive touchscreen according to the present invention;

[0025] Figure 6This is a cross-sectional view of the support part in an external capacitive touchscreen according to the present invention.

[0026] Figure 7 This is a diagram illustrating another embodiment of an external capacitive touchscreen according to the present invention;

[0027] In the diagram: 1. Protective cover plate, 2. Capacitive touch film, 3. Control card, 4. Flexible flat cable, 5. Shielding film, 6. Strip plate, 7. Limiting part, 8. Lifting part, 9. Snap-fit ​​part, 10. Second fixing screw, 11. First fixing screw, 12. Strip groove, 13. Threaded post, 14. Carrier plate, 15. Sealing head, 16. Cavity, 17. Rubber plug, 18. Connecting rod, 19. Cavity, 20. First threaded hole, 21. Threaded blind hole, 22. Rectangular frame. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] Example 1: Please refer to Figure 1 This invention provides a technical solution: an external capacitive touchscreen, including a protective cover plate 1, a capacitive touch film 2 installed on one side of the protective cover plate 1, a flexible flat cable 4 electrically connected to the capacitive touch film 2 installed between the protective cover plate 1 and the capacitive touch film 2, and a control card 3 for processing touch signals electrically connected to the other end of the flexible flat cable 4. The control card 3 is electrically connected to an LCD TV via a USB data cable. A shielding film 5 is installed on the side of the capacitive touch film 2 facing away from the protective cover plate 1. The shielding film 5 is a conductive film that can shield interference signals from the back of the capacitive touchscreen, thereby improving the stability of the capacitive touchscreen and preventing interference signals from different assembly environments of the user, which could lead to false alarms. The structure and working principle of the control card 3 have been fully disclosed in the prior art, so they will not be described in detail here.

[0030] See Figure 1 and Figure 2 The structure formed by the protective cover plate 1 and the capacitive touch film 2 is fixedly connected to two strip plates 6. The strip plates 6 are arranged vertically. The capacitive touch film 2 has four limiting parts 7 on the side away from the protective cover plate 1 to limit the position of the LCD TV. The limiting parts 7 have a rectangular cross-section and are fixedly connected to the ends of the strip plates 6. When the structure formed by the strip plates 6 and the limiting parts 7 is used, the snap-fit ​​part 9 can be hung on the hook on the wall, so that the whole assembly of the capacitive touch screen and the LCD TV can be suspended on the wall.

[0031] See Figure 2 , Figure 4 and Figure 5The limiting part 7 is connected to an adjustable supporting part 8 for supporting the LCD TV. The supporting part 8 has a rectangular cross-section. A cavity 19 is formed on the side of the limiting part 7 away from the protective cover plate 1. The cavity 19 has a rectangular cross-section. One end of the supporting part 8 is inserted into the cavity 19. Two circular cavities 16 are symmetrically formed on the side of the supporting part 8 away from the limiting part 7. The circular cavities 16 are arranged along the length direction of the supporting part 8. Two symmetrically formed cavities are formed on the end of the supporting part 8 that are inside the cavity 19, respectively connected to the two circular cavities. A guide hole communicating with cavity 16 has a diameter smaller than that of cavity 16. A connecting rod 18 is inserted into the guide hole. One end of the connecting rod 18 is fixed to the inner wall of cavity 19. A positioning hole is provided at the position where the connecting rod 18 is installed in cavity 19, so that the end of the connecting rod 18 away from the rubber plug 17 is fixed in the positioning hole, thereby increasing the contact range between the connecting rod 18 and the limiting part 7 and improving the stability of the connection between the connecting rod 18 and the limiting part 7. The other end of the connecting rod 18 extends into cavity 16 and is fixedly connected to the rubber plug 17. A rubber plug 17 is slidably installed inside a circular cavity 16. A removable sealing head 15 is installed on the side of the circular cavity 16 away from the guide hole. The sealing head 15 is fixed to one side of a carrier plate 14. The carrier plate 14 is fixedly connected to the lifting part 8 by two screws. By removing the carrier plate 14, it is easy to remove and install the sealing head 15. After removing the sealing head 15, the circular cavity 16 is connected to the outside. Pulling the lifting part 8 causes relative movement between the lifting part 8 and the limiting part 7. At this time, the rubber plug 17 at the end of the connecting rod 18 relative to the lifting part 7... The lifting part 8 slides within the circular cavity 16. When the dimensions of the structure formed by the lifting part 8 and the limiting part 7 meet the thickness of the LCD TV, the sealing head 15 seals the circular cavity 16 again. The rubber plug 17 is restricted within the circular cavity 16 under the action of pressure difference, thus completing the adjustment of the position of the lifting part 8. This meets the needs of LCD TVs of different thicknesses and expands the scope of application. By hiding the structure connecting the lifting part 8 and the limiting part 7 within the space of the lifting part 8 and the limiting part 7, it is beneficial to improve the aesthetics of the appearance.

[0032] See Figure 2 and Figure 6On the upper surface of the two support parts 8 located below the protective cover plate 1, away from the limiting part 7, there are vertically arranged first threaded holes 20. The first threaded holes 20 are internally threaded with first fixing screws 11 that contact the bottom of the LCD TV. The ends of the two support parts 8 located above the protective cover plate 1 are fixedly connected with locking parts 9 for locking onto the back of the LCD motor. The lower part of the side of the locking part 9 facing the LCD TV has a second threaded hole. The second threaded hole is internally threaded with a second fixing screw 10 that contacts the back of the LCD TV. This allows the capacitive touch screen composed of the protective cover plate 1 and the capacitive touch film 2 to be installed in the structure formed by the strip plate 6 and the limiting part 7. Then, the capacitive touch screen, consisting of the protective cover plate 1 and the capacitive touch film 2, is placed on the front of the LCD TV, and the LCD TV is placed within the space formed by the four limiting parts 7. Then, the first fixing screw 11 and the second fixing screw 10 are tightened so that both the first fixing screw 11 and the second fixing screw 10 are in contact with the surface of the LCD TV, thus completing the assembly of the capacitive touch screen. This process is convenient and quick. Removable rubber heads are installed at the ends of the first fixing screw 11 and the second fixing screw 10 near the LCD TV, which helps to make flexible contact between the first fixing screw 11 and the second screw and the surface of the LCD TV, thus protecting the surface of the LCD TV.

[0033] See Figure 2 , Figure 3 and Figure 6 The upper surfaces of the two limiting parts 7 located below the protective cover 1 and the lower surfaces of the two limiting parts 7 located above the protective cover 1 are each provided with a strip groove 12. The strip groove 12 is arranged along the length direction of the limiting part 7 and communicates with the cavity 19. The design of the strip groove 12 provides space for the movement of the threaded post 13. The side of the supporting part 8 facing the strip groove 12 is evenly provided with a plurality of vertically arranged threaded blind holes 21. The threaded blind holes 21 are staggered with the circular cavity 16, and the threaded blind holes 21 are internally threaded with a contact device. The threaded post 13 on the surface of the LCD TV has an internal hexagonal hole for matching an internal hexagonal wrench at the middle position of the side of the threaded blind hole 21 outside the threaded blind hole 21. The internal hexagonal wrench is inserted into the internal hexagonal hole to facilitate the turning of the threaded post 13. Turning the multiple threaded posts 13 on the support part 8 causes the length of the multiple threaded posts 13 exposed outside the threaded hole to change with the undulation of the LCD TV surface, and makes the top of the threaded post 13 contact the LCD TV surface, expanding the support range for the LCD TV and improving the stability of the assembly.

[0034] Example 2: See Figure 7 The support part is a rectangular frame 22, which allows the structure formed by the protective cover plate 1 and the capacitive touch film 2 to be installed inside the rectangular frame 22 to achieve the purpose of edge protection. When shipping, the capacitive touch screen is first fixed to the rectangular frame 22, so that after the user receives it, he only needs to stick it on the LCD TV and then connect the USB to realize the touch.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An external capacitive touchscreen, comprising a protective cover (1), characterized in that: A capacitive touch film (2) is installed on one side of the protective cover (1). A flexible flat cable (4) electrically connected to the capacitive touch film (2) is installed between the protective cover (1) and the capacitive touch film (2). The other end of the flexible flat cable (4) is electrically connected to a control card (3) for processing touch signals. The control card (3) is electrically connected to the LCD TV via a USB data cable. The structure formed by the protective cover (1) and the capacitive touch film (2) is fixedly connected to the support. Four limiting parts (7) for limiting the position of the LCD TV are provided on the side of the capacitive touch film (2) away from the protective cover (1). The limiting parts (7) are fixedly connected to the support. The limiting parts (7) are connected by connectors. The two support parts (8) located on the lower side of the protective cover plate (1) are connected to a support part (8) for lifting the LCD TV. The upper surface of the two support parts (8) is provided with a first threaded hole (20) arranged vertically on the side away from the limiting part (7). The first threaded hole (20) is connected with a first fixing screw (11) that contacts the bottom of the LCD TV. The ends of the two support parts (8) located on the upper side of the protective cover plate (1) are fixedly connected with a snap-fit ​​part (9) for snapping onto the back of the LCD TV. The snap-fit ​​part (9) is provided with a second threaded hole at the lower part of the side facing the LCD TV. The second threaded hole is connected with a second fixing screw (10) that contacts the back of the LCD TV. The connector includes a connecting rod (18). The limiting part (7) has a cavity (19) on the side away from the protective cover plate (1). One end of the lifting part (8) is inserted into the cavity (19). The lifting part (8) has two symmetrically arranged circular cavities (16) on the side away from the limiting part (7). The circular cavities (16) are arranged along the length of the lifting part (8). The end of the lifting part (8) inside the cavity (19) has two symmetrically arranged cavities, one connected to each of the two circular cavities. (16) A guide hole with a diameter smaller than that of the circular cavity (16) is connected to the guide hole. A connecting rod (18) is inserted into the guide hole. One end of the connecting rod (18) is fixed to the inner wall of the cavity (19). The other end of the connecting rod (18) extends into the circular cavity (16) and is fixedly connected to a rubber plug (17). The rubber plug (17) is slidably installed in the circular cavity (16). A detachable sealing head (15) is installed on the side of the circular cavity (16) away from the guide hole.

2. An external capacitive touchscreen according to claim 1, characterized in that: The support part is a strip plate (6), which is arranged vertically. Both ends of the strip plate (6) are fixedly connected to limiting parts (7), and the limiting parts (7) are arranged perpendicular to the strip plate (6).

3. An external capacitive touchscreen according to claim 1, characterized in that: The support part is a rectangular frame (22), and the structure formed by the protective cover plate (1) and the capacitive touch film (2) is installed inside the rectangular frame (22).

4. An external capacitive touchscreen according to claim 1, characterized in that: The capacitive touch film (2) has a shielding film (5) installed on the side facing away from the protective cover plate (1), and the shielding film (5) is a conductive film.

5. An external capacitive touchscreen according to claim 1, characterized in that: The sealing head (15) is fixed to one side of the carrier plate (14), and the carrier plate (14) is fixedly connected to the lifting part (8) by two screws.

6. An external capacitive touchscreen according to claim 1, characterized in that: A positioning hole is provided at the position where the connecting rod (18) is installed in the cavity (19), and the end of the connecting rod (18) away from the rubber plug (17) is fixed in the positioning hole.

7. An external capacitive touchscreen according to claim 1, characterized in that: A strip groove (12) is provided on the upper surface of the two limiting parts (7) located on the lower side of the protective cover plate (1) and on the lower surface of the two limiting parts (7) located on the upper side of the protective cover plate (1). The strip groove (12) is arranged along the length direction of the limiting part (7). The strip groove (12) communicates with the cavity (19). A plurality of vertically arranged threaded blind holes (21) are evenly provided on the side of the supporting part (8) facing the strip groove (12). The threaded blind holes (21) are staggered from the circular cavity (16). The threaded blind holes (21) are internally threaded with a threaded post (13) for contacting the surface of the LCD TV. The threaded post (13) is provided with an internal hexagonal hole for matching an internal hexagonal wrench at the middle position of the side of the threaded blind hole (21) outside the threaded blind hole (21).

8. An external capacitive touchscreen according to claim 1, characterized in that: The limiting part (7) has a rectangular cross-section, the cavity (19) has a rectangular cross-section, and the lifting part (8) has a rectangular cross-section.

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