CN210983358U - Pressure sensor and touch screen thereof - Google Patents

Abstract

The application provides a pressure sensor and touch-sensitive screen thereof includes: the induction module comprises a substrate, a first induction module arranged on the substrate and a second induction module which is arranged on the first induction module and has the same structure; the first induction module comprises a first flexible insulating layer, a plurality of first positive electrode structures, a first negative electrode structure and a plurality of first supporting structures, the first negative electrode structures are arranged on the substrate, the first supporting structures are arranged on the first negative electrode structures at intervals, the first flexible insulating layer covers the upper surfaces of the first supporting structures, and the first positive electrode structures are arranged on the lower surface of the first flexible insulating layer at intervals and are distributed among the first supporting structures; a plurality of first bearing structures of first response module stagger with a plurality of second bearing structures of second response module.

Description

A pressure sensor and touch screen thereof

technical field

The present application relates to the technical field of sensor design, and in particular, to a pressure sensor and a touch screen thereof.

Background technique

Pressure sensors with larger touch areas based on the principles of electrical contact resistance or capacitance change are more and more widely used. However, unlike single-point pressure sensors, pressure sensors with large-area touch areas are often implemented through multiple points, and support is required around each touch point to ensure that the initial position of the film layer is consistent, but there is a possibility that when the user touches the support position area , the conductive positive electrode in the pressure sensor will not be subjected to pressure and thus conduct with the conductive negative electrode, so that full-area coverage sensing cannot be achieved.

Utility model content

The purpose of the embodiments of the present application is to provide a pressure sensor and a touch screen thereof, so as to solve the problem that the conductive positive electrode in the pressure sensor will not be subjected to pressure when the user touches the support position area in the existing pressure sensor with a large area of the touch area. Further, it is conductive with the conductive negative electrode, and thus cannot realize the problem of full-area coverage sensing.

A first aspect includes: a substrate, a first sensing module set on the base, and a second sensing module set on the first sensing module; the first sensing module includes a first flexible insulation layer, a plurality of first positive electrode structures, a first negative electrode structure, and a plurality of first support structures, the first negative electrode structures are disposed on the substrate, and the plurality of first support structures are arranged at intervals on the first support structure. On a negative electrode structure, the first flexible insulating layer covers the upper surfaces of the plurality of first support structures, and the plurality of first positive electrode structures are disposed on the lower surface of the first flexible insulating layer at intervals and distributed Between the plurality of first support structures; the second induction module includes a second flexible insulating layer, a plurality of second positive electrode structures, a second negative electrode structure and a plurality of second support structures, the first Two negative electrode structures are disposed on the upper surface of the first flexible insulating layer, the plurality of second support structures are arranged on the second negative electrode structure at intervals, and the second flexible insulating layer covers the plurality of first negative electrode structures. Two upper surfaces of the supporting structures, the plurality of second positive electrode structures are disposed on the lower surface of the second flexible insulating layer at intervals and distributed between the plurality of second supporting structures; the plurality of first positive electrode structures The support structure is offset from the plurality of second support structures.

In the above-designed pressure sensor, two layers of sensing modules are used, and the first support structure in the first touch sensing module is staggered from the plurality of second support structures in the second sensing module, so that the user can touch the touch sensor located on the second touch sensor module. When the second support structure is under the flexible insulating layer, after the second support structure is stressed, part of the force is transferred to the first positive electrode structure located in the second layer, and the first positive electrode structure is stressed so that the first positive electrode structure is connected to the first positive electrode structure. The negative electrode structure contacts and then conducts, which solves the problem that the support position of the existing pressure sensor with a large-area sensing area is a non-sensing area, and the user cannot sense when touching, and realizes the full-scale operation of the pressure sensor in the large-area touch area. Area coverage sensing.

In an optional implementation of this embodiment, the first negative electrode structure includes a first negative electrode metal layer and a first elastic conductive layer, the first negative electrode metal layer is disposed on the substrate, and the first elastic conductive layer The layer is disposed on the first negative metal layer, and the plurality of first support structures are arranged on the first elastic conductive layer at intervals.

In an optional implementation of this embodiment, the second negative electrode structure includes a second negative electrode metal layer and a second negative electrode elastic conductive layer, the second negative electrode metal layer is disposed on the upper surface of the first flexible insulating layer, The second elastic conductive layer is disposed on the second negative electrode metal layer, and the plurality of second support structures are arranged on the second elastic conductive layer at intervals.

In the two embodiments of the above design, when the elastic conductive layer is subjected to an external force, the contact area increases with the increase of the force, which can then reflect the change in the magnitude of the force.

In an optional implementation of this embodiment, the first support structure and the second support structure are colloids.

In an optional implementation of this embodiment, the plurality of first support structures and the plurality of second positive electrode structures face each other one by one, and the plurality of second support structures and the plurality of first positive electrode structures face each other one by one .

In an optional implementation manner of this embodiment, the first negative electrode structure is disposed on the substrate by printing.

In an optional implementation manner of this embodiment, the second positive electrode structure is disposed under the second flexible insulating layer by printing.

In a second aspect, an embodiment provides a touch screen, where the touch screen includes the pressure sensor in any optional implementation manner of the first aspect.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, therefore It should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a first structure of a pressure sensor provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a second structure of a pressure sensor provided by an embodiment of the present application.

Icons: 10-substrate, 20-first induction module; 201-first flexible insulating layer; 202-first positive electrode structure; 203-first negative electrode structure; 2031-first negative electrode metal layer; 2032-first elastic conductive layer layer; 204-first support structure; 30-second induction module; 301-second flexible insulating layer; 302-second positive structure; 303-second negative structure; 3031-second negative metal layer; 3032-first Two elastic conductive layers; 304 - a second support structure.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

first embodiment

As shown in FIGS. 1 and 2 , an embodiment of the present application provides a pressure sensor. The pressure sensor includes a substrate 10 , a first sensing module 20 and a second sensing module 30 . The first sensing module 20 includes a first flexible The insulating layer 201 , a plurality of first positive electrode structures 202 , a first negative electrode structure 203 and a plurality of first supporting structures 204 , the first negative electrode structures 203 are disposed on the substrate 10 , and the plurality of first supporting structures 204 are arranged at intervals on the first supporting structure 204 . On a negative electrode structure 203 , a first flexible insulating layer 201 covers the upper surfaces of a plurality of first supporting structures 204 , and a plurality of first positive electrode structures 202 are disposed on the lower surface of the first flexible insulating layer 201 at intervals and distributed in a plurality of between the first support structures 204 .

The second sensing module 30 includes a second flexible insulating layer 301, a plurality of second positive electrode structures 302, a second negative electrode structure 303 and a plurality of second supporting structures 304. The second negative electrode structure 303 is disposed on the second flexible insulating layer On the upper surface of 301, a plurality of second support structures 304 are arranged on the second negative electrode structure 303 at intervals, the second flexible insulating layer 301 covers the upper surface of the plurality of second support structures 304, and the plurality of second positive electrode structures 302 are spaced apart are disposed on the lower surface of the second flexible insulating layer 301 and distributed among the plurality of second supporting structures 304 . The plurality of first support structures 204 and the plurality of second support structures 304 are staggered, that is, the bottom of the second support structures 304 corresponds to the first positive electrode structure 202 , and the bottom of the second positive electrode structure 302 corresponds to the first positive electrode structure 202 . A support structure 204 .

The reason for the non-sensing area of the existing pressure sensor with large-area touch area is that when the user touches the support structure in the sensor in the existing single-layer sensor, the conductive positive electrode structure will not be pressed down, so that the conductive positive electrode structure cannot be combined with the sensor. The conductive negative electrode structure is in contact, so that the path cannot be formed, so that the pressure sensor cannot respond. In the pressure sensor designed by the above solution, through the design of two layers of sensing modules, the first positive electrode structure 202 of the first sensing module 20 and the second supporting structure 304 of the second sensing module 30 and the first sensing module are The first support structure 204 of the 20 is opposite to the second positive electrode structure 302 of the second sensing module 30. Such an alternate arrangement makes the pressure sensor designed in this application, the user applies the pressure sensor by touching the second flexible insulating layer 301. During external pressure, when the second flexible insulating layer 301 touches the area corresponding to the second positive electrode structure 302, the external pressure causes the second positive electrode structure 302 to be pressed, so that the second positive electrode structure 302 and the second negative electrode structure are compressed. 303 contacts and conducts, when the second positive electrode structure 302 and the second negative electrode structure 303 are conductive, the pressure sensor outputs a resistance signal, and along with the change of the electrical contact resistance value, the output electrical signal reflects the force condition of the sensing area; When touching the area corresponding to the second support structure 304 on the second flexible insulating layer 301, the external pressure causes the second support structure 304 to be stressed and then pressed down. Since the second support structure 304 can transmit part of the force, Therefore, the first positive electrode structure 202 located under the second supporting structure 304 is subjected to the pressure transmitted by the second supporting structure 304, so that the first positive electrode structure 202 and the first negative electrode structure 203 are in conduction. After the negative electrode structure 203 is turned on, the pressure sensor outputs a resistance signal, and as the resistance value of the electrical contact changes, the output electrical signal reflects the stress condition of the sensing area.

In the above-designed pressure sensor, two layers of sensing modules are used, and the first support structure in the first touch sensing module is staggered from the plurality of second support structures in the second sensing module, so that the user can touch the touch sensor located on the second touch sensor module. When the second support structure is under the flexible insulating layer, after the second support structure is stressed, part of the force is transferred to the first positive electrode structure located in the second layer, and the first positive electrode structure is stressed so that the first positive electrode structure is connected to the first positive electrode structure. The negative electrode structure contacts and then conducts, which solves the problem that the support position of the existing pressure sensor with a large-area sensing area is a non-sensing area, and the user cannot sense when touching, and realizes the full-scale operation of the pressure sensor in the large-area touch area. Area coverage sensing.

In an optional implementation of this embodiment, as shown in FIGS. 1 and 2 , the first negative electrode structure 203 includes a first negative electrode metal layer 2031 and a first elastic conductive layer 2032 , and the first negative electrode metal layer 2031 is disposed on the substrate 10 On the top, the first elastic conductive layer 2032 is disposed on the first negative metal layer 2031, and a plurality of first support structures 204 are arranged on the first elastic conductive layer 2032 at intervals; the second negative structure 303 includes the second negative metal layer 3031 and The second elastic conductive layer 3032, the second negative metal layer 3031 is disposed on the upper surface of the first flexible insulating layer 201, the second elastic conductive layer 3032 is disposed on the second negative metal layer 3031, and a plurality of second supporting structures 304 are arranged at intervals on the second elastic conductive layer 3032 .

In an optional implementation of this embodiment, the first support structure 204 and the second support structure 304 are colloids.

In an optional implementation of this embodiment, as shown in FIGS. 1 and 2 , the number of the first positive electrode structure 202 , the first supporting structure 204 , the second positive electrode structure 302 and the second supporting structure 304 may be multiple, The number can be the same, the plurality of first support structures 204 and the plurality of second positive electrode structures 302 face each other one by one, and the plurality of second support structures 304 and the plurality of first positive electrode structures 202 face each other one by one, in this way, Each non-inductive area can be turned into an inductive area.

In an optional implementation of this embodiment, a first positive electrode structure 202 is disposed in a gap between every two first support structures 204 ; a second positive electrode structure 302 is disposed in a gap between every two second support structures 304 .

In an optional implementation of this embodiment, the width of the first positive electrode structure 202 is smaller than the gap distance between the two first support structures 204 , and the width of the second positive electrode structure 302 is smaller than the gap distance between the two second support structures 304 .

In an optional implementation of this embodiment, both the first elastic conductive layer 2032 and the second elastic conductive layer 3032 can be compressible electrical conductors. When they are compressible electrical conductors, the first elastic conductive layer 2032 and the first negative metal layer 2031 can be spaced at a certain distance, and the second elastic conductive layer 3032 can be spaced from the second negative metal layer 3031 by a certain distance, so that the first elastic conductive layer 2032 and the second elastic conductive layer 3032 are under stress Contact with the first negative metal layer 2031 and the second negative metal layer 3031 during pressing. When it is an incompressible electrical conductor, the elastic conductive layer can be in direct contact with the negative metal layer.

In the above designed embodiment, when the conductive layer is a compressible elastic conductor, when the external force is applied, the contact area increases with the increase of the force, which can then reflect the change in the magnitude of the force.

In an optional implementation manner of this embodiment, the aforementioned first positive electrode structure 202 , the first negative electrode metal layer 2031 , the second positive electrode structure 302 and the second negative electrode metal layer 3031 can all be made of silver.

Second Embodiment

The present application provides a touch screen, the touch screen includes the pressure sensor described in any of the optional test methods in the first embodiment. The structure of the pressure sensor has been described in the first embodiment, and will not be repeated here.

In the touch screen designed in the present application, the design is achieved by two layers of touch sensing layers, and the first conductive positive electrode of the first touch sensing layer and the second colloid of the second touch sensing layer, and the first colloid and the second colloid of the first touch sensing layer. The second conductive positive electrodes of the two touch-sensing layers are opposite to each other, so that when the user touches the first colloid under the touch layer, the first colloid will transfer part of the force to the second conductive positive electrode below, and the second conductive positive electrode will be affected by the force. After the force is applied, the second conductive positive electrode is connected to the second conductive negative electrode through the second conductor, which solves the problem that the existing pressure sensor with a large area of the area is a non-sensing area, and the user cannot sense when touching. , realize the full-area coverage sensing of the large-area touch area pressure sensor.

In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or is usually placed when the product of the application is used. The orientation or positional relationship is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application. Furthermore, the terms "first", "second", etc. are only used to differentiate the description and should not be construed to indicate or imply relative importance.

It should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection The connection can also be indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific situations.

The above descriptions are merely examples of the present application, and are not intended to limit the protection scope of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. A pressure sensor, comprising: the device comprises a substrate, a first induction module arranged on the substrate and a second induction module arranged on the first induction module;

the first induction module comprises a first flexible insulating layer, a plurality of first positive electrode structures, a first negative electrode structure and a plurality of first supporting structures, the first negative electrode structures are arranged on the substrate, the first supporting structures are arranged on the first negative electrode structures at intervals, the first flexible insulating layer covers the upper surfaces of the first supporting structures, and the first positive electrode structures are arranged on the lower surface of the first flexible insulating layer at intervals and are distributed among the first supporting structures;

the second induction module comprises a second flexible insulating layer, a plurality of second positive electrode structures, a second negative electrode structure and a plurality of second support structures, the second negative electrode structures are arranged on the upper surface of the first flexible insulating layer, the plurality of second support structures are arranged on the second negative electrode structures at intervals, the second flexible insulating layer covers the upper surfaces of the plurality of second support structures, and the plurality of second positive electrode structures are arranged on the lower surface of the second flexible insulating layer at intervals and are distributed among the plurality of second support structures;

the plurality of first support structures are staggered from the plurality of second support structures.

2. The pressure sensor of claim 1, wherein the first negative electrode structure comprises a first negative electrode metal layer disposed on the substrate and a first elastic conductive layer disposed on the first negative electrode metal layer, and the plurality of first support structures are arranged on the first elastic conductive layer at intervals.

3. The pressure sensor of claim 1, wherein the second negative electrode structure comprises a second negative electrode metal layer and a second elastic conductive layer, the second negative electrode metal layer is disposed on the upper surface of the first flexible insulating layer, the second elastic conductive layer is disposed on the second negative electrode metal layer, and the plurality of second support structures are arranged on the second elastic conductive layer at intervals.

4. The pressure sensor of claim 1, wherein the first and second support structures are gel.

5. The pressure sensor of claim 1, wherein the first plurality of support structures are directly opposite the second plurality of positive structures, and wherein the second plurality of support structures are directly opposite the first plurality of positive structures.

6. The pressure sensor of claim 1, wherein a first positive structure is disposed in the gap between every two first support structures; and a second positive electrode structure is arranged in the gap between every two second support structures.

7. The pressure sensor of claim 6, wherein the width of the first positive structure is less than the width of the gap between the two first support structures; the width of the second positive electrode structure is smaller than the width of a gap between the two second support structures.

8. The pressure sensor of claim 1, wherein the first negative electrode structure is disposed on the substrate by printing.

9. The pressure sensor of claim 1, wherein the second positive structure is disposed under the second flexible insulating layer by printing.

10. A touch screen characterized in that it comprises a pressure sensor according to any one of claims 1 to 9.

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