CN220022777U - FPC touch key structure and electronic terminal - Google Patents

Abstract

The utility model discloses an FPC touch key structure which comprises an FPC, at least one touch pattern and a hollow, wherein one touch pattern corresponds to one hollow, the touch pattern and the hollow are arranged on the FPC, and the hollow is positioned in the middle of the corresponding touch pattern. According to the FPC touch key structure, the key light transmission function can be achieved through the hollow structure, and the reliability and stability of the key function are improved by adopting the embedded design of the Chinese character 'Hui'.

Description

FPC touch key structure and electronic terminal

Technical Field

The utility model relates to a touch screen key, in particular to an FPC touch key structure and an electronic terminal.

Background

The FPC touch key is a capacitive key for sensing finger touch operation, which is manufactured on FPC with touch patterns, and is commonly used for human-computer interaction in household appliances and industrial control equipment. At present, the key FPC patterns are conventionally E-shaped, return-shaped (a circle of driving patterns and a circle of sensing patterns) and the like, so that the keys cannot be well guaranteed to be difficult to be interfered by the outside, and the light transmission cannot be realized when the key cannot be hollowed, so that the diversity design of the keys is limited.

For example, patent number CN205610606U discloses a touch key FPC and a mobile terminal, so as to solve the problems that the current touch key FPC has too many leads and grid ground wires of the sensing wire, too large space occupying the clearance area of the antenna, and affects the performance of the antenna. In order to solve the problems, the utility model discloses a touch key flexible circuit board FPC, which comprises a touch key and further comprises: the touch sensing layer and the reference layer are positioned below the touch sensing layer; the touch sensing layer comprises a plurality of driving wires and sensing wires, the driving wires and the sensing wires are arranged in a staggered mode to form a sensing capacitor, and one end of each sensing wire is provided with a lead connection point of each sensing wire; the reference layer comprises a line ground wire and a grid ground wire, wherein: the line ground wire is arranged corresponding to the driving wire and the induction wire; the grid ground wire is internally provided with a lead wire of the induction wire, the lead wire of the induction wire is provided with a lead wire connecting end of the induction wire, and the lead wire connecting end of the induction wire is correspondingly arranged and electrically connected with a lead wire connecting point of the induction wire; the lead wire of the induction wire and the lead wire of the driving wire are arranged on the same side. The utility model also discloses a mobile terminal comprising the touch key FPC. Compared with the prior art, the utility model has the following advantages: the touch key FPC comprises a touch key, a touch sensing layer and a reference layer positioned below the touch sensing layer. The touch sensing layer comprises a plurality of driving lines and sensing lines; the driving lines and the sensing lines are arranged in a staggered manner to form a sensing capacitor; one end of the induction wire is provided with a lead connection point of the induction wire. The reference layer comprises a line ground wire and a grid ground wire, and the line ground wire is arranged corresponding to the driving wire and the sensing wire; the grid ground wire is internally provided with a lead of the induction wire, the lead of the induction wire is provided with a lead connecting end of the induction wire, and the lead connecting end of the induction wire is correspondingly arranged and electrically connected with a lead connecting point of the induction wire; the lead wire of the induction wire and the lead wire of the driving wire are arranged on the same side. Compared with the touch key FPC in the prior art, the touch key FPC provided by the utility model can effectively reduce the quantity of the leads and the grid ground wires of the induction wire, and can reduce the influence of the leads and the grid ground wires of the induction wire on the surrounding environment, and particularly can greatly reduce the space occupation of an antenna clearance area of the mobile terminal, thereby reducing the influence on the antenna performance, and further effectively saving the space and the cost.

In addition, due to the reduction of the grid ground wires, the bypass capacitance integrated between the driving wires and the sensing wires is reduced, so that the sensing area of the touch key can be adjusted, and the capacitance sensing amount of the touch key is improved; in addition, the sensitivity of the touch control key can be improved by adjusting the length of the lines of the driving line and the sensing line and the size of the gap between the driving line and the sensing line, and the sensitivity requirement of different touch control keys can be met.

However, the touch key FPC pattern adopted in the application is E-shaped, the keys cannot be well guaranteed to be difficult to be interfered by the outside, the key cannot be hollowed, light transmission cannot be achieved, and the key stability is insufficient.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides the FPC touch key structure, the key light transmission function can be realized by arranging the hollowed-out structure, and the reliability and the stability of the key function are improved by adopting the embedded design in the shape of a Chinese character 'hui'.

The technical problems to be solved by the utility model are realized by the following technical scheme:

the utility model provides a FPC touch key structure, includes FPC, at least one touch pattern and fretwork, one the touch pattern corresponds one the fretwork, touch pattern and fretwork set up on FPC, the fretwork is located in the middle of the touch pattern that corresponds.

Further, the touch pattern comprises a driving pattern and a sensing pattern, and the driving pattern and the sensing pattern form a capacitive touch key;

the driving pattern is used for inputting a touch driving signal;

the sensing pattern is used for outputting a touch sensing signal.

Further, the sensing pattern is embedded within the driving pattern.

Further, the driving pattern is in a shape of a Chinese character 'hui', and the sensing pattern is positioned between the inner layer and the outer layer of the Chinese character 'hui' of the driving pattern and is surrounded by the inner layer and the outer layer of the Chinese character 'hui' of the driving pattern.

Further, the hollowed-out part is positioned in the middle of the inner layer of the Chinese character 'Hui' shape of the driving pattern.

Further, an opening is formed in the lower portion of the outer layer in the shape of the Chinese character 'Hui' of the driving pattern, and the sensing pattern is connected with the corresponding sensing wire from the opening of the corresponding driving pattern; the upper part of the sensing pattern is provided with an opening, and the inner layer and the outer layer of the back character shape of the driving pattern are connected from the opening of the corresponding sensing pattern.

Further, the sensing patterns of the plurality of touch patterns are sequentially connected in parallel through sensing wires, and the driving patterns of the plurality of touch patterns are sequentially connected in series through driving wires.

Further, the FPC further includes: GND copper sheet, drive wiring, induction wiring, drive IC, external wiring and FPC interface;

the GND copper sheet is used for being grounded and connected with the drive IC through a grounding signal wire and surrounds at least one touch pattern;

the touch pattern is connected with the drive IC through the drive wiring and the induction wiring;

the drive IC is connected with the FPC plug interface through the external wiring;

and the FPC plug-in port is provided with a reinforcing sheet.

Further, the FPC appearance is T type, touch pattern set up in T type upper portion, drive IC set up in T type middle part, FPC jack sets up in T type lower part.

An electronic terminal comprising any one of the FPC touch key structures.

The utility model has the following beneficial effects:

the utility model provides a FPC touch key structure, includes FPC, at least one touch pattern and fretwork, one the touch pattern corresponds one the fretwork, the touch pattern sets up on FPC, the fretwork sets up in the middle of the touch pattern that corresponds. The FPC touch key structure provided by the utility model has the advantages that the key light transmission function can be realized by arranging the hollowed-out structure, and the reliability and stability of the key function are improved by adopting the embedded design of the Chinese character 'hui'.

Drawings

FIG. 1 is a schematic diagram of an FPC touch key structure according to the present utility model;

fig. 2 is a schematic diagram of a partial structure of an FPC touch key structure according to the present utility model.

1. An FPC; 2. a touch pattern; 21. driving the pattern; 22. sensing the pattern; 23. driving the wiring; 24. sensing wiring; 3. hollow out; 4. GND copper sheet; 5. a driving IC; 6. externally connecting wiring; 7. a reinforcing sheet; 8. FPC interface.

Detailed Description

The present utility model is described in detail below with reference to the drawings and the embodiments, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, or can be communicated between two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

As shown in fig. 1, the FPC touch key structure provided by the present utility model includes:

FPC1, at least one touch pattern 2 and fretwork 3, one touch pattern 2 corresponds one fretwork 3, touch pattern 2 and fretwork 3 set up on FPC, fretwork 3 is located the middle of corresponding touch pattern 2.

According to the utility model, the hollowed-out parts 3 are arranged on the FPC1, and one hollowed-out part 3 is correspondingly positioned in the middle of one touch pattern 2, so that the FPC touch key structure can be matched with the backlight lamp strip to realize a key light transmission function.

As shown in fig. 2, the touch pattern 2 includes a driving pattern 21 and a sensing pattern 22, where the driving pattern 21 and the sensing pattern 22 form a capacitive touch key; the driving pattern 21 is used for emitting a touch driving signal; the sensing pattern 22 is used for outputting a touch sensing signal.

In this embodiment, when a single key is triggered, the touch key structure determines a touch signal of a finger through a change of a capacitance parameter between the driving pattern 21 and the sensing pattern 22, when no finger touches, the charge amount between the driving pattern 21 and the sensing pattern 22 is constant, and no touch is determined to occur, when a single finger touches, the capacitance parameter between the driving pattern 21 and the sensing pattern 22 changes, resulting in a change of the charge amount between the driving pattern 21 and the sensing pattern 22, which causes the sensing pattern 22 to discharge outwards to output a touch sensing signal, and the touch sensing signal is transmitted to the driving IC5 through the corresponding sensing trace 24, and the driving IC5 determines which key is triggered by the finger by identifying the corresponding sensing trace 24, so as to start the corresponding key function.

Further, the sensing pattern 22 is embedded within the driving pattern 21; the driving pattern 21 is in a shape of a Chinese character 'hui', the sensing pattern 22 is located between the inner and outer layers of the Chinese character 'hui' of the driving pattern 21 and is surrounded by the inner and outer layers of the Chinese character 'hui' of the driving pattern 21, and after the sensing pattern 22 surrounds the touch pattern 22, electromagnetic shielding areas are formed on the inner and outer sides of the touch pattern 2 respectively, so that the functions of the touch pattern 22 are not easy to be interfered by the outside, and the reliability and stability of the key functions are improved.

Further, the hollow 3 is located in the middle of the inner layer of the driving pattern 21, and the light below the hollow 3 can be irradiated through the hollow 3 to realize the function of key luminescence, and the design of key diversity is realized.

As shown in fig. 2, an opening is provided at the lower part of the outer layer of the zigzag shape of the driving pattern 21, and the sensing pattern 22 is connected with the corresponding sensing trace 24 from the opening of the corresponding driving pattern 21; an opening is formed in the upper portion of the sensing pattern 22, and the inner and outer layers of the zigzag shape of the driving pattern 21 are connected from the opening of the corresponding sensing pattern 22.

Further, the sensing patterns 22 of the touch patterns 2 are sequentially connected in parallel through sensing wires 24, the driving patterns 21 of the touch patterns 2 are sequentially connected in series through driving wires 23, the driving IC5 simultaneously provides touch driving signals for all the driving patterns 21 through one driving wire 23, and the driving IC5 receives touch sensing signals from different sensing patterns 22 through the sensing wires 24.

In another alternative embodiment, as shown in fig. 1, when a plurality of keys are triggered, the capacitance parameters between the driving pattern 21 and the sensing pattern 22 change, the sensing pattern 22 outputs a touch sensing signal outwards and transmits the signal to the driving IC5 through a plurality of corresponding parallel sensing wires 24, and the driving IC5 determines that the plurality of keys are triggered by fingers by identifying the plurality of corresponding sensing wires 24 and starts corresponding combined key functions, so as to realize diversity of key function combinations.

Example two

As shown in fig. 1, the FPC further includes: GND copper sheet 4, drive wiring 23, induction wiring 24, drive IC5, external wiring 6 and FPC plug interface 8; the GND copper sheet 4 is used for grounding connection with the driving IC5 through a grounding signal wire thereof, surrounds at least one touch pattern 2, reduces signal interference and circuit noise, and can improve the anti-interference capability and stability of the circuit; the touch pattern 2 is connected with the driving IC5 through the driving wire 23 and the sensing wire 24, and the driving IC5 starts a corresponding key function by receiving an electric signal of the touch pattern 2; the drive IC5 is connected with the FPC plug-in port 8 through the external wiring 6; the FPC interface 8 is provided with a reinforcing sheet 7.

Although the capacitive key has the advantages of high response speed, good touch feeling and capability of realizing multi-point touch control. However, the corresponding disadvantage is that the FPC1 is susceptible to external environmental influences, such as temperature, humidity, electromagnetic interference, etc., and for this purpose, the GND copper sheet 4 for shielding the interference must be provided to achieve the stability of the key.

Wherein the GND copper sheet 4 is used for providing an electrical connection and shielding effect in a circuit. The GND copper sheet 4 may cover one or more sides of the entire circuit board and be connected to the GND pins. Thus, electromagnetic interference and noise can be effectively reduced, and stability and reliability of the circuit can be improved. The GND copper sheet 4 is usually coated with a corrosion-resistant and protective layer to increase its service life.

The driving IC5 can control and read the touch key, detect the touch state, the pressing state and the releasing state of the key, and realize different functions; the occurrence of false touch can be reduced by setting the threshold value and the time, and the reliability and the stability of the product are improved; and more functions can be realized by multi-touch.

Further, in order to improve the compression resistance and stability of the FPC1 and prevent the problems of brittle fracture, breakage, etc. in environments of high temperature, high humidity, high pressure, etc., the reinforcing sheet 7 may be made of polyimide PI material, which has excellent properties of high temperature, high strength, high rigidity, low dielectric constant, low dielectric loss, etc., and can maintain stability in severe environments of high temperature, high humidity, high pressure, etc. The reinforcing treatment of the FPC interface 8 by using the PI reinforcing sheet 7 material can effectively improve the compression resistance and stability of the FPC interface 8, reduce the probability of faults of the FPC interface 8 in severe environments such as high temperature, high humidity, high voltage and the like, and improve the service life and reliability of the FPC 1.

Further, the FPC1 is T-shaped, the touch pattern 2 is disposed on the upper portion of the T-shape, the driving IC5 is disposed in the middle portion of the T-shape, and the FPC socket 8 is disposed on the lower portion of the T-shape.

In addition, the T-shaped profile in this embodiment is only a preferred scheme, and the profile of the FPC1 is not particularly limited, and may be other profiles including the above-mentioned FPC touch key structure.

Example III

Based on the FPC touch key structure, the utility model also provides an electronic terminal, the terminal adopts the FPC touch key structure, a key light transmission function can be realized by arranging a hollowed-out structure in the touch pattern, and the induction pattern 22 is embedded into the driving pattern 21 by adopting a Chinese character 'hui' type embedded design, so that the pattern function is not easy to be interfered by the outside, and the reliability and stability of the key function are improved.

Finally, it should be noted that the foregoing embodiments are merely for illustrating the technical solution of the embodiments of the present utility model and are not intended to limit the embodiments of the present utility model, and although the embodiments of the present utility model have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the embodiments of the present utility model may be modified or replaced with the same, and the modified or replaced technical solution may not deviate from the scope of the technical solution of the embodiments of the present utility model.

Claims (8)

1. The utility model provides a FPC touch key structure which characterized in that includes:

the touch control device comprises an FPC (1), at least one touch control pattern (2) and a hollow-out part (3), wherein one touch control pattern (2) corresponds to one hollow-out part (3), the touch control pattern (2) and the hollow-out part (3) are arranged on the FPC, and the hollow-out part is positioned in the middle of the corresponding touch control pattern (2);

the touch control pattern (2) comprises a driving pattern (21) and a sensing pattern (22), and the driving pattern (21) and the sensing pattern (22) form a capacitive touch control key;

the driving pattern (21) is used for inputting a touch driving signal;

the sensing pattern (22) is used for outputting a touch sensing signal;

the sensing pattern (22) is embedded within the driving pattern (21).

2. The FPC touch key structure according to claim 1, wherein:

the driving pattern (21) is in a shape of a Chinese character 'hui', and the sensing pattern (22) is positioned between the inner layer and the outer layer of the Chinese character 'hui' of the driving pattern (21) and is surrounded by the inner layer and the outer layer of the Chinese character 'hui' of the driving pattern (21).

3. The FPC touch key structure according to claim 2, wherein:

the hollowed-out parts (3) are positioned in the middle of the inner layer in the shape of the Chinese character 'Hui' of the driving pattern (21).

4. The FPC touch key structure according to claim 2 or 3, wherein: the lower part of the outer layer of the square shape of the driving pattern (21) is provided with an opening, and the sensing pattern (22) is connected with a corresponding sensing wiring (24) from the opening of the corresponding driving pattern (21); the upper part of the sensing pattern (22) is provided with an opening, and the inner layer and the outer layer of the zigzag shape of the driving pattern (21) are connected from the opening of the corresponding sensing pattern (22).

5. The FPC touch key structure according to claim 4, wherein: the sensing patterns (22) of the touch patterns (2) are sequentially connected in parallel through sensing wires (24), and the driving patterns (21) of the touch patterns (2) are sequentially connected in series through driving wires (23).

6. The FPC touch key structure according to claim 1, wherein: the FPC further includes: GND copper sheet (4), driving wire (23), sensing wire (24), driving IC (5), external wire (6) and FPC plug interface (8);

the GND copper sheet (4) is used for being grounded and connected with the driving IC (5) through a grounding signal wire, and surrounds at least one touch pattern (2);

the touch pattern (2) is connected with the driving IC (5) through the driving wiring (23) and the sensing wiring (24);

the driving IC (5) is connected with the FPC plug-in port (8) through the external wiring (6);

and the FPC plug-in port (8) is provided with a reinforcing sheet (7).

7. The FPC touch key structure according to claim 6, wherein: the FPC (1) is of a T-shaped appearance, the touch pattern (2) is arranged on the upper portion of the T-shaped appearance, the driving IC (5) is arranged in the middle of the T-shaped appearance, and the FPC plug-in port (8) is arranged on the lower portion of the T-shaped appearance.

8. An electronic terminal, characterized in that: an FPC touch key structure comprising any one of claims 1 to 7.