Touch area capacitive functional sheet with LED (light-emitting diode) backlight

Abstract

The utility model provides a touch area capacitive functional sheet with LED backlight, which comprises a multi-layer FPC (flexible printed circuit) which is internally provided with two non-contact and corresponding conductive layers to form a capacitive touch area; lED lamp beads are arranged near the touch area. The extension end of the multi-layer FPC is provided with a PIN, and the touch area and the LED lamp beads are electrically connected with the touch area. The capacitive touch area is adopted to replace a traditional physical key structure, the related problems of equipment quality, maintenance cost and the like caused by the fact that physical keys of a traditional membrane switch product are prone to damage are effectively solved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electrical engineering technology, and in particular to a capacitive functional chip for a touch area with LED backlight. Background Technology

[0002] A membrane switch is an integrated operating system combining button functionality, indicating elements, and an instrument panel. It consists of four parts: a panel, an upper circuit, an insulating layer, and a lower circuit. When the membrane switch is pressed, the contacts in the upper circuit deform downwards, making contact with the plates in the lower circuit to conduct electricity. When the finger is released, the contacts in the upper circuit rebound, breaking the circuit and triggering a signal. Membrane switches have a robust structure, an attractive appearance, and excellent sealing. They are moisture-proof and have a long service life. They are widely used in electronic communication, electronic measurement instruments, industrial control, medical equipment, the automotive industry, smart toys, and home appliances.

[0003] Traditional membrane switch products consist of physical switches. During long-term pressing operations, the physical buttons are easily damaged, which cannot guarantee the quality of the equipment, thus affecting its use and increasing the maintenance cost. Therefore, this utility model proposes a capacitive functional chip with LED backlight for the touch area to at least partially solve the above-mentioned problems. Utility Model Content

[0004] In view of the above problems, this utility model proposes a capacitive functional chip with LED backlight for touch area that overcomes or at least partially solves the above problems.

[0005] To solve the above problems, this utility model discloses a capacitive functional chip for a touch area with LED backlight, comprising: a multilayer FPC, which has two non-contact and corresponding conductive layers to form a capacitive touch area.

[0006] LED beads are located near the touch area;

[0007] The extended end of the multilayer FPC is provided with a PIN, and the touch area and the LED beads are electrically connected to the touch area.

[0008] Furthermore, two LED beads are provided near each of the aforementioned touch areas.

[0009] Furthermore, the multilayer FPC includes:

[0010] The graphite screen ink layer, the silver screen ink layer, and the semi-transparent conductive ink layer are sequentially bonded together from top to bottom.

[0011] The silver screen ink layer has a hollow conductive hole relative to the touch area, and the outer periphery of the conductive hole has a conductive path electrically connected to the extension end.

[0012] The semi-transparent conductive ink layer has a conductive ink coating that is concentric with the conductive hole and can cover the conductive hole;

[0013] The graphite screen ink layer is provided with a PIN electrically connected to the conductive path, and is also provided with a graphite coating that is concentric with the conductive hole and has an area smaller than the conductive hole.

[0014] Furthermore, the multilayer FPC also includes:

[0015] A PET film bonded to the semi-transparent conductive ink layer, and a shaping layer and a protective film layer bonded sequentially to the outside of the graphite screen ink layer.

[0016] Furthermore, the protective film layer is bonded to the shaping layer using double-sided adhesive.

[0017] Furthermore, the outer layer of the protective film is provided with double-sided adhesive, and a sticker is provided on the outside of the double-sided adhesive.

[0018] Furthermore, a reinforcing block is provided on the back of the PIN.

[0019] Furthermore, the double-sided adhesive tape is provided with marking blocks.

[0020] Furthermore, the multilayer FPC has a thickness of 0.3–0.4 mm.

[0021] Furthermore, the reinforcing block is a steel sheet.

[0022] This invention offers the following advantages: A capacitive touch area is formed by using a multi-layer FPC with two non-contact, corresponding conductive layers; an LED bead is located near the touch area; a PIN is provided at the extended end of the multi-layer FPC, and the touch area and the LED bead are electrically connected to the touch area. By replacing the traditional physical button structure with a capacitive touch area, this invention effectively solves the problems associated with the easy damage of physical buttons in traditional membrane switch products and the resulting equipment quality and maintenance costs, thus improving the service life of the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the equivalent circuit of an LED lamp bead in a capacitive functional chip for a touch area with LED backlight, provided in one embodiment of this utility model.

[0026] Figure 3 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of a PET film structure for a capacitive functional sheet with LED backlighting in a touch area provided in one embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0033] Figure 10 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0034] Figure 11 This is a schematic diagram of the surface structure of a capacitive functional chip with LED backlight for a touch area provided in one embodiment of the present invention.

[0035] In the diagram: 100, Multilayer FPC; 101, Sticker; 102, Double-sided Adhesive; 103, Protective Film Layer; 104, Shaping Layer; 105, Graphite Screen Ink Layer; 106, Silver Screen Ink Layer; 107, Semi-transparent Conductive Ink Layer; 108, PET Film; 109, Reinforcing Block; 110, Marking Block; 151, Graphite Coating; 161, Conductive Hole; 171, Conductive Ink Coating; 200, LED Bead; 300, Touch Area; 400, PIN. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments; the components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0037] It should be noted that in any embodiment of this application, the aforementioned PIN refers to the pins of the circuit board, also known as gold fingers, and FPC refers to a flexible printed circuit board; polyethylene terephthalate (PET), commonly known as polyester resin, is a milky white or light yellow highly crystalline polymer with a smooth and glossy surface. LED (Light Emitting Diode), or LED for short, is a commonly used light-emitting device.

[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the various embodiments and features described below can be combined with each other.

[0039] Please refer to Figure 1 - Figure 3 As shown, this utility model embodiment provides a capacitive functional chip for a touch area with LED backlight, including: a multilayer FPC100, which has two non-contact and corresponding conductive layers to form a capacitive touch area 300; LED beads 200 are provided near the touch area 300; a PIN 400 is provided at the extended end of the multilayer FPC100, and the touch area 300 and the LED beads 200 are electrically connected to the touch area.

[0040] In this embodiment, the capacitive functional sheet with LED backlight in the touch area solves the problem of easily damaged physical buttons in the prior art. Specifically, traditional membrane switch products, due to their use of physical switches, are prone to damage to their physical button structure under prolonged pressing. This application employs a capacitive touch area 300, formed by two non-contact, corresponding conductive layers within a multi-layer FPC 100. This touch method based on capacitive sensing eliminates the wear and tear associated with the mechanical structure of physical buttons. Users only need to touch the corresponding area to trigger a change in capacitance to achieve the desired function, eliminating the risk of mechanical damage caused by repeated pressing of physical buttons. This fundamentally solves the problem of compromised device quality due to the susceptibility of physical buttons to damage.

[0041] Traditional physical buttons are prone to damage, which affects equipment quality and necessitates frequent repairs and replacements, leading to high maintenance costs. This technical solution uses a capacitive touch area 300 to form the touch buttons, avoiding this problem. The frequency of maintenance due to button damage is significantly reduced, consequently decreasing the manpower and material costs associated with maintenance. For example, it eliminates the need for frequent purchases of replacement parts and the dispatch of technicians for replacements, effectively lowering the overall maintenance cost of the equipment.

[0042] In this application, capacitive touch keys offer more sensitive and convenient operation. Compared to the pressure requirements of traditional physical buttons, touch operation is easier, allowing users to interact with the device more naturally and smoothly. Furthermore, it avoids the unpleasant experience of operation failure due to physical button damage, providing users with a better user experience and enhancing user satisfaction. The capacitive functional chip has a more compact structure and more flexible layout, especially when paired with LED beads 200 for indicating button operations. Moreover, the LED beads 200 can be flexibly controlled to turn on and off based on touch area operations, which is more energy-efficient than some traditional continuous lighting methods, offering certain energy-saving and environmental benefits.

[0043] As a preferred implementation, each of the touch areas 300 is provided with two LED beads 200; different displays can be made according to the specific operation.

[0044] In a preferred embodiment, the multilayer FPC 100 includes: a graphite screen ink layer 105, a silver screen ink layer 106, and a semi-transparent conductive ink layer 107, which are sequentially bonded together from top to bottom; the silver screen ink layer 106 has a hollow conductive hole 161 relative to the touch area 300, and the outer periphery of the conductive hole 161 has a conductive path electrically connected to the extension end; the semi-transparent conductive ink layer 107 has a conductive ink coating 171 concentric with the conductive hole 161 and capable of covering the conductive hole 161; the graphite screen ink layer 105 has a PIN 400 electrically connected to the conductive path, and also has a graphite coating 151 concentric with the conductive hole 161 and with an area smaller than the conductive hole 161. A capacitive touch area 300 is formed through the conductive hole 161. The conductive ink coating 171 is electrically connected around the conductive hole 161 and electrically connected to the PIN 400 through the conductive path. At this time, the conductive ink coating 171 on the semi-transparent conductive ink layer 107 forms one electrode of the capacitor, while the graphite coating 151 on the graphite screen ink layer 105 forms the other electrode of the capacitor by passing through the conductive hole 161 of the screen ink layer 106, preventing it from contacting the conductive ink coating 171. When touched, the electric field between the electrodes changes, which is equivalent to the static electricity of the human body changing the charge of the electrodes, thereby triggering the touch signal.

[0045] In a preferred embodiment, the multilayer FPC 100 further includes: a PET film 108 bonded to the translucent conductive ink layer 107, and a shaping layer 104 and a protective film layer 103 sequentially bonded to the outside of the graphite screen ink layer 105. The PET film 108 protects the bottom of the FPC 100, preventing the risk of short circuits when the bottom of the FPC 100 comes into contact with a conductor. Furthermore, it protects the internal circuitry of the FPC 100 from external moisture.

[0046] In a preferred embodiment, the protective film layer 103 is bonded to the shaping layer 104 using double-sided adhesive 102. Preferably, 3M double-sided adhesive 102 is used, as it has strong adhesion, allowing for better bonding between the protective film layer 103 and the shaping layer 104; the protective film layer is used to protect the FPC 100 from the front.

[0047] Furthermore, the outer layer of the protective film layer 103 is also provided with double-sided adhesive 102, and the outer side of the double-sided adhesive 102 is also provided with sticker 101. When in use, the sticker 101 with double-sided adhesive 102 on the outer layer of the protective film layer 103 is peeled off and then attached to the target position.

[0048] It should be noted that when applying the double-sided adhesive 102, the touch area 300 should be avoided to prevent affecting the touch sensitivity.

[0049] As a preferred embodiment, a reinforcing block 109 is provided on the back of the PIN400. The reinforcing block 109 is a steel sheet. The steel sheet reinforcing block 109 makes the position of the PIN400 more stable. Since this position may be frequently connected to other devices, the reinforcement can enhance its rigidity and prevent it from being easily bent or damaged during insertion.

[0050] In a preferred embodiment, the double-sided adhesive tape 102 is provided with a marking block 110, which can be used to mark the capacitive functional sheet of the touch area, for example, to mark the function or the front and back sides.

[0051] In a preferred embodiment, the multilayer FPC100 has a thickness of 0.3-0.4 mm, that is, the overall thickness of the capacitive functional sheet for the touch area with LED backlight is between 0.3-0.4 mm; wherein, the thickness of the touch area 300 is between 0.095-0.1 mm, the thickness of the PET film 108 is between 0.065-0.08 mm, and the thickness of the protective film layer 103 is between 0.145-0.165 mm; specifically, the overall thickness of the capacitive functional sheet for the touch area with LED backlight is controlled between 0.3-0.4 mm, wherein the thickness of the touch area 300 is 0.095-0.1 mm, the thickness of the PET film 108 is 0.065-0.08 mm, and the thickness of the protective film layer 103 is 0.145-0.165 mm. The reasonable setting of the thickness of each part not only meets the functional requirements of different components, such as the function of the touch area 300, the auxiliary role of the PET film 108, and the protective function of the protective film layer 103, but also works together to ensure that the device achieves good results in terms of spatial adaptability, thin and light design and overall performance, so that it can be better suited to various application scenarios with thickness requirements.

[0052] In a preferred embodiment, the PET film 108 is made of an insulating material and is transparent. Its insulating properties ensure the safety of the capacitive functional chip with LED backlighting in the touch area and the stable operation of its internal circuitry. By providing an isolation barrier for charged components, it ensures the normal operation of each component. The transparency not only ensures the effective transmission of light from the illumination source to achieve a good lighting effect, but also enhances the visibility and ease of use of the touch interaction function in conjunction with the touch area function, thus improving the overall performance and user experience of the capacitive functional chip with LED backlighting in the touch area.

[0053] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0054] The above provides a detailed description of a capacitive functional chip with LED backlight for a touch area provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A capacitive functional chip for a touch area with LED backlighting, characterized in that, include: A multi-layer FPC has two non-contact, corresponding conductive layers inside, forming a capacitive touch area; LED beads are located near the touch area; The extended end of the multilayer FPC is provided with a PIN, and the touch area and the LED beads are electrically connected to the touch area.

2. The capacitive functional chip for the touch area according to claim 1, characterized in that, Two LED beads are located near each of the aforementioned touch areas.

3. The capacitive functional chip for the touch area according to claim 1, characterized in that, The multilayer FPC includes: The graphite screen ink layer, the silver screen ink layer, and the semi-transparent conductive ink layer are sequentially bonded together from top to bottom. The silver screen ink layer has a hollow conductive hole relative to the touch area, and the outer periphery of the conductive hole has a conductive path electrically connected to the extension end. The semi-transparent conductive ink layer has a conductive ink coating that is concentric with the conductive hole and can cover the conductive hole; The graphite screen ink layer is provided with a PIN electrically connected to the conductive path, and is also provided with a graphite coating that is concentric with the conductive hole and has an area smaller than the conductive hole.

4. The capacitive functional chip for the touch area according to claim 3, characterized in that, The multilayer FPC also includes: A PET film bonded to the semi-transparent conductive ink layer, and a shaping layer and a protective film layer bonded sequentially to the outside of the graphite screen ink layer.

5. The capacitive functional chip for the touch area according to claim 4, characterized in that, The protective film layer is bonded to the shaping layer with double-sided adhesive.

6. The capacitive functional chip for the touch area according to claim 5, characterized in that, The outer layer of the protective film is also provided with double-sided adhesive, and a sticker is also provided on the outside of the double-sided adhesive.

7. The capacitive functional chip for the touch area according to claim 1, characterized in that, A reinforcing block is provided on the back of the PIN.

8. The capacitive functional chip for the touch area according to claim 5, characterized in that, The double-sided adhesive tape has marking blocks on it.

9. The capacitive functional chip for the touch area according to claim 1, characterized in that, The multilayer FPC has a thickness of 0.3–0.4 mm.

10. The capacitive functional chip for the touch area according to claim 7, characterized in that, The reinforcing block is a steel sheet.

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