CN211349307U

CN211349307U - Touch control panel structure

Info

Publication number: CN211349307U
Application number: CN201922219516.6U
Authority: CN
Inventors: 高营; 于宙; 程孝仁
Original assignee: Lenovo Beijing Ltd
Current assignee: Lenovo Beijing Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-08-25
Anticipated expiration: 2029-12-11

Abstract

The application provides a touchpad structure, including: a cover layer having a first hardness; the printed circuit board is bonded with the lower side part area of the covering layer, the printed circuit board has a second hardness, the second hardness is greater than the first hardness, and the printed circuit board supports the covering layer when the covering layer is under the action of external force; the printed circuit board is provided with a first type sensor and a second type sensor, the first type sensor is used for detecting the operation position of the operation body on the covering layer, and the second type sensor is used for detecting the pressing degree of the operation body on the covering layer. The covering layer with lower hardness is supported by the printed circuit board with higher hardness in the touch control plate structure, so that the covering layer can be prevented from being deformed too much under the condition that the covering layer is touched or pressed by the operation body for a long time, and the condition that the detection precision of the subsequent corresponding detection operation is influenced is avoided.

Description

Touch control panel structure

Technical Field

The utility model relates to a physical input system, more specifically the utility model relates to a touch-control plate structure that says so.

Background

The touch pad is an input device which can move a cursor by using a sliding operation of a finger on a smooth touch pad, controls the motion of a pointer by sensing the movement of the finger of a user, and is widely applied to input equipment of a notebook computer.

With the increasing demand of users for fashion and beauty of electronic equipment, the traditional embedded type pressable touch pad cannot meet the use requirements of users. In the prior art, many manufacturers use polymethyl methacrylate (PMMA) as a covering layer on the surface of the electronic device to improve the overall aesthetic and fashionable performance of the electronic device, but PMMA material is soft, and is easily deformed in long-term use, thereby affecting the normal use of the electronic device.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a following technical scheme:

a touchpad structure, comprising:

a cover layer having a first hardness;

the printed circuit board is bonded with the lower side part area of the covering layer, the printed circuit board has a second hardness, the second hardness is greater than the first hardness, and the printed circuit board supports the covering layer when the covering layer is under the action of external force;

the printed circuit board is provided with a first type sensor and a second type sensor, the first type sensor is used for detecting the operation position of the operation body on the covering layer, and the second type sensor is used for detecting the pressing degree of the operation body on the covering layer.

Optionally, a clearance area is disposed around the printed circuit board.

Optionally, the width of the clearance area is 5 mm.

Optionally, the area of the cover layer is larger than that of the printed circuit board, and the cover layer completely covers the first surface of the electronic device.

Optionally, a touch panel integrated circuit and a force detection integrated circuit are arranged on the printed circuit board.

Optionally, the cover layer is a glass cover layer plated with a conductive film or an organic glass PMMA cover layer plated with a conductive film.

Optionally, the printed circuit board is a printed circuit board with a thickness ranging from 0.8mm to 1.0 mm.

Optionally, the first type of sensor is a capacitive touch sensor, and the second type of sensor is an elastic wave sensor.

Optionally, the printed circuit board includes a plurality of elastic wave sensors thereon, and the plurality of elastic wave sensors are uniformly distributed around the periphery of the printed circuit board.

Optionally, the elastic wave sensor is disposed on the printed circuit board by an SMT soldering method.

Known via foretell technical scheme, compare with prior art, the utility model discloses a touchpad structure is provided, include: a cover layer having a first hardness; the printed circuit board is bonded with the lower side part area of the covering layer, the printed circuit board has a second hardness, the second hardness is greater than the first hardness, and the printed circuit board supports the covering layer when the covering layer is under the action of external force; the printed circuit board is provided with a first type sensor and a second type sensor, the first type sensor is used for detecting the operation position of the operation body on the covering layer, and the second type sensor is used for detecting the pressing degree of the operation body on the covering layer. The covering layer with lower hardness is supported by the printed circuit board with higher hardness in the touch control plate structure, so that the covering layer can be prevented from being deformed too much under the condition that the covering layer is touched or pressed by the operation body for a long time, and the condition that the detection precision of the subsequent corresponding detection operation is influenced is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a touch pad structure disclosed in an embodiment of the present invention;

fig. 2 is a schematic side view of another touch pad structure disclosed in the present embodiment;

fig. 3 is a schematic top perspective view illustrating a touch pad structure shown in fig. 2 according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an implementation form of the first surface disclosed in the embodiments of the present application;

fig. 5 is a schematic layout of a capacitive touch sensor disclosed in an embodiment of the present application;

fig. 6 is a schematic layout of an elastic wave sensor according to an embodiment of the present disclosure;

fig. 7 is a schematic view illustrating a process of correcting a Z-axis detection value according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is a side view schematic diagram of a touch panel structure disclosed in the embodiment of the present invention, referring to fig. 1, the touch panel structure can include:

a cover layer 10 having a first hardness.

And a printed circuit board 20 adhesively connected to a lower portion of the cover layer 10, wherein the printed circuit board 20 has a second hardness, the second hardness being greater than the first hardness, and the printed circuit board 20 supports the cover layer 10 when the cover layer 10 is subjected to an external force.

A first type sensor 21 and a second type sensor 22 are disposed on the printed circuit board 20, the first type sensor 21 is a sensor for detecting an operation position of an operation body on the cover layer 10, and the second type sensor 22 is a sensor for detecting a pressing force of the operation body on the cover layer 10.

Among them, the cover layer 10 is required to have flat, beautiful and wear-resistant characteristics as an input device member that can be directly presented to the eyes of a user and is directly touched by the user. In this application, do not do fixed restriction to the material of overburden, it can be for present or future probably any can satisfy above-mentioned material that levels beautifully, wear-resisting characteristic, for example, glass, organic glass PMMA that exist at present etc. these materials possess certain printing opacity characteristic, and surface gloss is good, possess certain wearability, accord with the general aesthetic characteristics of present vast user, regard it as the outward appearance ornamental material that has specific function of electronic equipment, can satisfy user's in general hobby demand.

It should be noted that some materials that can be used as the covering layer are soft, and when the covering layer is used as the surface layer of the touch pad structure, the covering layer is easily deformed under the long-term effect of repeated touch and pressing by a user, so that large or small recesses or protrusions are generated on the surface of the covering layer, which affects the detection accuracy of the subsequent touch pad related detection device for detecting the touch and pressing operations of the user. Therefore, in the embodiment of the present application, the printed circuit board 20 is adhered to the lower side of the covering layer 10, and the printed circuit board 20 has a relatively strong hardness, so that a certain supporting force is provided for the covering layer 10 when the covering layer 10 is under the action of an external force under the condition that the hardness of the covering layer 10 is less than that of the printed circuit board 20, and the covering layer 10 is prevented from being excessively deformed under the action of the external force.

The touch pad needs to implement a touch function, and therefore, some sensors need to be disposed below the cover layer 10 to detect corresponding touch operations and pressing operations of a user. In the embodiment of the present application, the printed circuit board 20 is provided with the first type of sensor 21 and the second type of sensor 22, and certainly, the embodiment of the present application does not make fixed restrictions on the types and the number of the types of the sensors arranged on the printed circuit board 20, and only the arranged sensors need to be ensured to meet the normal detection requirement of the touch panel. In one example, the first type sensor 21 may be a sensor for detecting an operation position of an operating body on the cover layer 10, and the second type sensor 22 may be a sensor for detecting a pressing force of the operating body on the cover layer 10; of course, if in the future technology, the integration of the two types of sensors into one sensor to realize the two functions can be realized, it will be understood that the realization thereof is also included in the protection scope of the present application.

It should be noted that, the specific arrangement form of the sensor on the printed circuit board is not limited in this application, and may be arranged appropriately according to the detection principle and the required alignment of the sensor. In fig. 1, the position of the sensor on the printed circuit board is only a schematic structure, and does not represent the specific arrangement and number of the sensors on the printed circuit board.

In this embodiment, the covering layer with lower hardness is supported by the printed circuit board with higher hardness in the touchpad structure, so that the covering layer can be prevented from being deformed too much when being touched or pressed by the operating body for a long time, and the detection precision of the subsequent corresponding detection operation is affected.

In the above embodiment, the cover layer may be a glass cover layer plated with a conductive film or a polymethyl methacrylate (PMMA) cover layer plated with a conductive film. By the conductive film, the cover layer is made to have a conductive property, so that a touch and press signal of an operation body such as a finger of a user can be accurately detected. Of course, the realization of the conductive property is not limited to the realization of the conductive film, and for example, a material of the cover layer may be doped with a certain proportion of conductive particles to provide the cover layer with the conductive property.

Fig. 2 is a schematic side view of another touch pad structure disclosed in the embodiment of the present application, and fig. 3 is a schematic top perspective view of the touch pad structure shown in fig. 2 disclosed in the embodiment of the present application, and in combination with fig. 2 and fig. 3, the touch pad structure further includes a clearance area 30 around the printed circuit board in addition to the structures of the above-mentioned embodiments.

Wherein the clearance area 30 is an area where no structural component is disposed; in a conventional understanding, it is believed that a gap exists between the perimeter of a rectangular printed circuit board and other structural components of the electronic device, and that no physical structure exists in the gap.

As described in the foregoing embodiments, the second type sensor 22 may be a sensor for detecting the pressing force of the operation body on the cover layer 10, such as an elastic wave sensor, which performs a corresponding detection function by detecting an elastic wave generated when the user presses the cover layer. Under the detection principle, if the periphery of the structure related to the sensor (such as the sensor itself and the printed circuit board connected thereto) is designed to be fixed in the structure assembly, the waveform conduction of the elastic wave may be affected, and thus the accuracy of the detection result of the elastic wave sensor may be affected. That is, other solid structures are designed closely around the structure related to the sensor, and the existence of these solid structures may affect the free conduction of the elastic wave waveform, therefore, in the embodiment of the present application, a clearance area is provided around the printed circuit board 20, so that the sensor such as the elastic wave sensor type is not affected by the stress of the system structure, and the above-mentioned solid structures are prevented from affecting the conduction of the waveform.

It should be noted that the periphery of the printed circuit board is not limited to the peripheral range corresponding to the thickness of the printed circuit board, but may be, for example, a sensor disposed on the printed circuit board has a certain thickness or height according to actual needs. The first height is at least not less than the thickness or height of the printed circuit board and the second type sensor; in addition, in this embodiment, the range of the first distance is not fixedly limited, and may be specifically set according to an actual application scenario. For example, the clearance zone may have a width of 5mm, where the width is the distance of the outer boundary of the clearance zone from the printed circuit board frame in the plane of the printed circuit board. In one example, the printed circuit board is a printed circuit board having a thickness in the range of 0.8mm to 1.0 mm.

In the above embodiment, the area of the cover layer is larger than that of the printed circuit board, and the first surface of the electronic device can be completely covered, so as to improve the overall aesthetic property of the appearance of the electronic device. As shown in fig. 4, the structure of the all-in-one screen input device disclosed in the embodiment of the present application includes a touch area 41, a keyboard area 42, and a non-functional area 43. In the above-mentioned implementation of the integral screen, the surface of the input device is an integral screen, i.e. the first surface is entirely covered by the covering layer and is a plane. The boundary and the color of each key area in the touch area and the keyboard area can be identified through the coating on the covering layer, and the coating colors in different areas can be set according to the requirement; of course, the boundary identification of different areas can also be realized by the boundary lamp, and the calibration of different areas can also be realized by the strip lamp with a certain shape because the covering layer can have certain light transmittance.

Fig. 4 is a schematic diagram of an implementation form of the first surface disclosed in the embodiment of the present application, and in other implementations, the first surface of the electronic device may include only the touch area 41 and the non-functional area 43, and does not include the keyboard area 42; or the three areas mentioned above, but the touch area 41 and the non-functional area 43 are of a unitary planar design, i.e. both areas are covered by a cover layer, while the keypad area 42 is also of a conventional keypad design in the form of keys. In this application, different implementations of the first surface are not shown one by one.

In a specific implementation, a touch panel integrated circuit and a force detection integrated circuit may be disposed on the printed circuit board. Since the arrangement of the first type sensors 21 and the second type sensors 22 have different implementations, the touch panel integrated circuit can collectively process all signals detected by all the first type sensors 21; the force detection integrated power may collectively process all signals detected by all of the second type sensors 22. All signals described herein may be signals from one sensor or signals from multiple sensors.

In one specific implementation, the first type sensor 21 may be a capacitive touch sensor, and the second type sensor 22 may be an elastic wave sensor. Fig. 5 is a schematic layout of a capacitive touch sensor disclosed in an embodiment of the present application, wherein the detection lines 51 of the capacitive touch sensor may be arranged in a mesh shape above the printed circuit board 20, i.e., between the printed circuit board 20 and the cover layer 10, so as to better detect a touch signal of a user.

In the case where the second type of sensor 22 may be an elastic wave sensor, the printed circuit board 20 may include a plurality of elastic wave sensors thereon, the plurality of elastic wave sensors being evenly distributed around the periphery of the printed circuit board 20.

Fig. 6 is a schematic layout of elastic wave sensors disclosed in an embodiment of the present application, and as shown in fig. 6, 8 elastic wave sensors 61 are disposed on the periphery of the printed circuit board 20 on average, and 8 elastic wave sensors 61 are capable of detecting a pressure signal in a cover layer area above the printed circuit board 20. In a specific implementation, the elastic wave sensor may be disposed on the printed circuit board 20 by an SMT soldering method.

In practical applications, in order to better detect the touch and pressing signals of the user, the detected signals can be further subjected to correlation processing to obtain a detection result with better accuracy. The specific processing procedure may be as shown in fig. 7, where the CPU is an electronic device controller, the Touchpad is a Capacitive Touch sensor processing unit, the Forcepad gesture control unit is a pressure Touch pad gesture control unit, the Force active area is a Force feedback unit, the Touch active area is a Touch feedback unit, the Touch detection area is a Touch addition measurement unit, the Z 'capacitance correction unit is a Z' Force correction unit, the Date capacitance calculation area is a data calculation unit, the Analog unit Analog front end, the Elastic wave sensor is an Elastic wave sensor, and the Capacitive Touch sensor is a Capacitive Touch sensor, and the implementation content includes:

1. and connecting the elastic wave sensor and the capacitive touch sensor to the same controller.

2. And the processing unit reads the original data of the elastic wave sensor and calculates to obtain an initial result of Z' (the force in the vertical direction).

3. Since the elastic wave sensor detects the vibration waveform, the complicated waveform superposition has great difficulty in calculating the z-axis force. Many computing resources are required to be occupied for operation, and the computing time has an influence on the corresponding speed of the touch function.

According to the method and the device, the accuracy of Z-axis calculation is improved by adopting a correction compensation mode, and meanwhile, the operation load is reduced. And (3) taking the X and Y coordinate data information detected by the capacitive touch sensor as closed-loop feedback input information, correcting the deviation amount of the Z' which is originally calculated, and finally obtaining accurate data of the Z (the force in the vertical direction).

4. And correcting Z 'by using X and Y values calculated by the capacitive touch sensor, so that the precision of Z' is improved, and Z with high accuracy is obtained.

5. And inputting the corrected data into the system through contrast confirmation of the definition of the preset gesture.

In practical application, since the PMMA material is soft, deformation can occur after long-term use by a user. Deformation can influence the touch detection benchmark, leading to detection data drift, influence and detect the uniformity. The stress is different for the user for different zone responses and different from the previously customary manipulation techniques.

The application provides a self-checking method. The specific method may be that a reliability test is performed in a research and development stage, a material change rule of the PMMA cover layer is obtained through the test, an influence of deformation on touch detection is trained, and a correspondence between the deformation and the touch detection is determined, that is, a correspondence F (F) (E) between the reference signal E and the force F of the touch detection is determined. When the touch screen is started, the processing unit automatically detects the elastic wave reference signal, and if the reference signal deviates, the touch control calculation deviation is corrected according to the change of the reference signal.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A touchpad structure, comprising:

a cover layer having a first hardness;

2. The trackpad structure of claim 1, the printed circuit board having a clearance zone disposed about a periphery thereof.

3. The trackpad structure of claim 2, the clear area having a width of 5 mm.

4. The trackpad structure of claim 1, the cover layer having an area larger than an area of the printed circuit board and completely covering the first surface of the electronic device.

5. The touchpad structure of claim 1, the printed circuit board having a touchpad integrated circuit and a force detection integrated circuit disposed thereon.

6. The touchpad structure of claim 1, the cover layer being a glass cover layer plated with a conductive film or a plexiglas PMMA cover layer plated with a conductive film.

7. The trackpad structure of claim 1, the printed circuit board being a printed circuit board having a thickness in the range of 0.8mm-1.0 mm.

8. The trackpad structure of claim 1, the first type of sensor being a capacitive touch sensor and the second type of sensor being an elastic wave sensor.

9. The trackpad structure of claim 8, comprising a plurality of elastic wave sensors on the printed circuit board, the plurality of elastic wave sensors being evenly distributed around the periphery of the printed circuit board.

10. The trackpad structure of claim 8, wherein the elastic wave sensor is disposed on the printed circuit board by SMT soldering.