CN107045406A - Electronic equipment, touch display screen and pressure induction touch screen - Google Patents

Abstract

The invention relates to an electronic device, a touch display screen and a pressure sensing touch screen, wherein the pressure sensing touch screen comprises a touch sensing electrode layer, a conductive film, a piezoelectric film and a second pressure sensing electrode layer, the conductive film comprises a first substrate, a first conductive layer and a second conductive layer, the first conductive layer is directly arranged on the first surface to form a touch driving electrode layer, the second conductive layer is directly arranged on the second surface to form a first pressure sensing electrode layer, and therefore the first conductive layer and the second conductive layer are directly formed on two opposite surfaces of the same first substrate, a substrate and an adhesive layer for adhering are reduced, the thickness is effectively reduced, and the process is simplified.

Description

Electronics, touch displays, and pressure-sensitive touchscreens

technical field

The invention relates to the field of pressure-sensing touch technology, in particular to an electronic device, a touch screen and a pressure-sensing touch screen.

Background technique

Electronic devices with touch displays such as smartphones, tablets, smart cars, etc. have been fully integrated into our daily lives. Nowadays, the user experience is no longer satisfied with the existing touch experience in the display plane, and the pressure-sensing touch that can sense the touch force has become a new pursuit.

In order to reduce the thickness, it is possible to directly fabricate a conductive layer on the piezoelectric film, such as performing ITO sputtering on the piezoelectric film. However, limited by the temperature, the fabrication process of the conductive layer may reduce the piezoelectric performance of the piezoelectric film, and the subsequent acid/alkali treatment by electrode etching will also affect the performance and stability of the piezoelectric film.

In order to reduce the thickness, the touch electrode and the pressure-sensing electrode can also be made on the same conductive layer, but the touch electrode and the pressure-sensing electrode are adjacent to each other. When the finger touches the touch electrode, the capacitance change between the driving layer and the sensing layer may be due to The presence of the pressure-sensing electrodes is greatly weakened, which affects the judgment of the touch operation, and the electric field generated between the driving electrodes and the sensing electrodes during operation will also be applied to the piezoelectric material, further affecting the judgment of the pressure-sensing.

Contents of the invention

Based on this, it is necessary to provide an electronic device, a touch display screen and a pressure-sensing touch screen that can effectively reduce the thickness in order to solve the above technical problems.

A pressure sensitive touch screen comprising:

Touch sensing electrode layer;

The conductive film includes a first substrate, a first conductive layer, and a second conductive layer, the first substrate includes a first surface and a second surface opposite to the first surface, and the first surface faces toward The touch sensing electrode layer, the first conductive layer is directly arranged on the first surface to form a touch driving electrode layer, the touch sensing electrode layer and the touch driving electrode layer are stacked and insulated from each other, the second The conductive layer is directly disposed on the second surface to form a first pressure-sensing electrode layer;

a piezoelectric film disposed on the first pressure-sensitive electrode layer; and

The second pressure-sensing electrode layer is arranged on the surface of the piezoelectric film facing away from the first pressure-sensing electrode layer, so that the piezoelectric film is located between the first pressure-sensing electrode layer and the second pressure-sensing electrode layer. Between the sensing electrode layers.

In one of the embodiments, a via hole is opened on the first substrate, the via hole penetrates the first surface and the second surface, and the via hole is filled with a conductive material to form a conductive lead, so One end of the conductive lead is electrically connected to the first pressure-sensing electrode layer, and the other end of the conductive lead passes through the via hole and extends to the first surface.

In one of the embodiments, the conductive lead includes a binding part, a penetrating part and an overlapping part, the binding part is located on the first surface, the penetrating part is located in the via hole, and the overlapping part The overlapping portion is overlapped on the first pressure-sensing electrode layer, and the binding portion and the overlapping portion are respectively connected to opposite ends of the penetrating portion.

In one of the embodiments, one end of the through portion is extended along its axial direction to form a first extension portion, and the first extension portion is located on the first surface for clamping the first base material, and the The first extension part is spaced apart from the binding part by the via hole; and/or

The other end of the through portion extends along its axial direction to form a second extension, the second extension is located on the second surface, and is used to hold the first base material, and the second extension and The overlapping portions are spaced apart by the vias.

In one embodiment, the overlapping section includes a connecting section, a climbing section and an overlapping section, the connecting section is connected to the through section, and the climbing section is located between the connecting section and the overlapping section. Between segments, the overlapping segment overlaps the surface of the first pressure-sensing electrode layer.

In one of the embodiments, it further includes a protective cover, the protective cover includes a first side and a second side opposite to the first side, the touch sensing electrode layer is directly formed on the protective cover the first side of the

It also includes a protective cover and a second substrate, the protective cover includes a first side and a second side opposite to the first side, the touch sensing electrode layer is formed on the second substrate, The touch-sensing electrode layer and the second base material are disposed on the first side surface of the protection cover.

In one of the embodiments, when the touch-sensing electrode layer is formed on the second substrate, the pressure-sensing touch screen further includes a flexible circuit board, and the flexible circuit board includes three binding regions, respectively The first binding area, the second binding area and the third binding area, the first binding area is used for binding the touch sensing electrode layer, and the second binding area is used for connecting with the touch drive The electrode layer is bound to the conductive lead, and the third binding area is used for binding the second pressure-sensing electrode layer.

In one of the embodiments, it further includes a third substrate, the second pressure-sensing electrode layer is arranged on the third substrate, between the second pressure-sensing electrode layer and the piezoelectric film, the Adhesive glue layers are respectively arranged between the piezoelectric film and the first pressure-sensing electrode layer.

A touch display, comprising:

A pressure sensitive touch screen as described in any one of the above; and

The display screen is arranged below the pressure-sensitive touch screen.

An electronic device comprising:

Touch display as above.

The above pressure sensitive touch screen has at least the following advantages:

The first substrate includes a first surface and a second surface opposite to the first surface, the first conductive layer is directly arranged on the first surface to form a touch drive electrode layer, and the second conductive layer is directly arranged on the second surface to form a first pressure The induction electrode layer, so the first conductive layer and the second conductive layer are directly formed on the opposite two surfaces of the same first substrate, reducing one layer of substrate and one layer of adhesive layer for bonding, effectively reducing the thickness, Moreover, the process is simplified. The touch sensing electrode layer and the touch driving electrode layer are stacked and insulated from each other, and the touch driving electrode layer and the touch sensing electrode layer form a touch sensing layer for detecting touch signals. The first pressure-sensing electrode layer and the second pressure-sensing electrode layer are respectively arranged on opposite sides of the piezoelectric film to form a structure for detecting pressure signals.

Description of drawings

1 is a cross-sectional view of a pressure-sensitive touch screen in an embodiment;

2 is a cross-sectional view of a pressure-sensitive touch screen in another embodiment;

3 is a cross-sectional view of a via hole of a first substrate filled with a conductive material in an embodiment;

FIG. 4 is a cross-sectional view of the binding of the pressure-sensitive touch screen shown in FIG. 2 and the flexible circuit board.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

An electronic device in an embodiment includes a touch display screen. For example, the electronic device may be a smart phone, a tablet computer, a smart car, etc., and these electronic devices all have a touch display screen.

The touch display screen includes a pressure-sensing touch screen and a display screen, and the display screen is arranged below the pressure-sensing touch screen. Specifically, the display screen may be a flexible display screen, which is beneficial to improve the bending resistance of the display screen. Certainly, in other implementation manners, the display screen may also be an ordinary rigid display screen.

Please refer to FIG. 1 . In one embodiment, a pressure-sensing touch screen 10 includes a protective cover 100 , a touch-sensing electrode layer 200 , a conductive film 300 , a piezoelectric film 400 and a second pressure-sensing electrode layer 500 . The protective cover 100 includes a first side 110 and a second side 120 opposite to the first side 110. The first side 110 is a bonding surface for combining with other film layers, and the second side 120 is a pressing surface for the user. Touch the touch surface. The protective cover 100 may be a transparent glass cover.

The touch sensing electrode layer 200 is disposed on the first side 110 of the protection cover 100 . The touch sensing electrode layer 200 is a transparent electrode layer made of a transparent material, or a visually transparent electrode layer made of a conductive material, such as a grid structure. Specifically in this embodiment, the touch-sensing electrode layer 200 is directly formed on the first side 110 of the protective cover 100 . Therefore, it is possible to further reduce one layer of base material and adhesive layer for bonding, further reducing the thickness of the entire structure.

Of course, please refer to FIG. 2 , which shows a pressure-sensitive touch screen 10 in another embodiment. In the embodiment shown in FIG. 2 , the touch-sensing electrode layer 200 is formed on the second substrate 610 , and the touch-sensing electrode layer 200 and the second substrate 610 are disposed on the first side 110 of the protective cover 100 . An adhesive layer 710 is disposed between the touch-sensing electrode layer 200 and the protective cover 100 , so that the touch-sensing electrode layer 200 is disposed on the first side 110 of the protective cover 100 .

Please refer to FIG. 1 and FIG. 2 , the conductive film 300 includes a first substrate 310 , a first conductive layer and a second conductive layer. The first substrate 310 includes a first surface 311 and a second surface 312 opposite to the first surface 311 , and the first surface 311 faces the protective cover 100 . The first conductive layer is directly arranged on the first surface 311 to form the touch driving electrode layer 320, the touch driving electrode layer 320 and the touch sensing electrode layer 200 are stacked and insulated from each other, and the second conductive layer is directly arranged on the second surface 312 to form the first pressure The sensing electrode layer 330 . Both the first conductive layer and the second conductive layer are transparent conductive layers, so as to realize the visual transparency of the visible area.

Referring to FIG. 3 , a via hole 313 is opened on the first substrate 310 , the via hole 313 penetrates the first surface 311 and the second surface 312 , and the via hole 313 is filled with conductive material to form a conductive lead 340 . One end of the conductive lead 340 is electrically connected to the first pressure-sensing electrode layer 330 , and the other end of the conductive lead 340 passes through the via hole 313 and then extends to the first surface 311 . Therefore, the conductive lead 340 guides the first pressure-sensing electrode layer 330 to the same side as the touch-driving electrode layer 320 , which is beneficial to simplify the bonding process while reducing the overall thickness of the pressure-sensing touch screen.

The conductive lead 340 includes a binding portion 341, a penetrating portion 342 and an overlapping portion 343, the binding portion 341 is located on the first surface 311, the binding portion 341 is used for binding with the flexible circuit board, the penetrating portion 342 is located in the via hole 313, The overlapping portion 343 is overlapped on the first pressure-sensing electrode layer 330 to realize the electrical connection between the conductive lead 340 and the first pressure-sensing electrode layer 330, and the binding portion 341 and the overlapping portion 343 are respectively connected to opposite sides of the through portion 342. ends.

One end of the through portion 342 is extended along its axial direction to form a first extension portion 344 , the first extension portion 344 is located on the first surface 311 for clamping the first base material 310 , and the first extension portion 344 and the binding portion 341 are formed by The vias 313 are spaced apart. The other end of the through portion 342 extends axially to form a second extension portion 345 , the second extension portion 345 is located on the second surface 312 for clamping the first base material 310 , and the second extension portion 345 and the overlapping portion 343 are spaced apart by vias 313 . Therefore, the first base material 310 is clamped between the first end formed by the binding portion 341, one end of the penetrating portion 342 and the first extension portion 344 and the other end with the overlapping portion 343, the penetrating portion 342 and the second end. Between the second ends jointly formed by the extending portion 345 , the conductive lead 340 is prevented from detaching from the via hole 313 and being separated from the first substrate 310 .

The overlapping portion 343 includes a connecting section 3431, a climbing section 3432 and an overlapping section 3433. The connecting section 3431 is connected to the other end of the through portion 342. The climbing section 3432 is located between the connecting section 3431 and the overlapping section 3433. The overlapping section 3433 overlaps the surface of the first pressure-sensing electrode layer 330 . Specifically, in this embodiment, the climbing section 3432 is in the shape of a slope, and correspondingly the end of the first pressure-sensing electrode layer 330 is also in the shape of a slope, which is beneficial to prevent the overlapping section 3433 from breaking.

Please refer to FIG. 1 , an adhesive layer 710 is provided between the touch driving electrode layer 320 and the touch sensing electrode layer 200 to form a laminated structure between the touch driving electrode layer 320 and the touch sensing electrode layer 200 , and make the touch driving electrode layer 320 and the touch sensing electrode layer 200 are insulated from each other. The bonding glue layer can be OCA glue.

Referring to FIG. 2 , an adhesive layer 710 is disposed between the second substrate 610 and the touch driving electrode layer 320 to form a laminated structure of the second substrate 610 and the touch driving electrode layer 320 . Since the touch-sensing electrode layer 200 is formed on the second substrate 610 instead of the first side 110 of the protective cover 100 , the difficulty of the process can be reduced and the production cost can be reduced.

The piezoelectric film 400 is disposed on the first pressure-sensing electrode layer 330 . Specifically, the piezoelectric film 400 and the first pressure-sensing electrode layer 330 are laminated by an adhesive layer 710 .

The second pressure-sensing electrode layer 500 is disposed on the surface of the piezoelectric film 400 facing away from the first pressure-sensing electrode layer 330 , so that the piezoelectric film 400 is located between the first pressure-sensing electrode layer 330 and the second pressure-sensing electrode layer 500 . The second pressure-sensing electrode layer 500 is directly formed on the third substrate 620 , and an adhesive layer 710 is disposed between the second pressure-sensing electrode layer 500 and the piezoelectric film 400 .

When the piezoelectric film 400 is deformed under pressure in a certain direction, a polarization phenomenon will occur inside the piezoelectric film 400 , and the polarization causes positive and negative charges to appear on two opposite surfaces of the piezoelectric film 400 . The first pressure-sensing electrode layer 330 and the second pressure-sensing electrode layer 500 are used to pick up the voltage signal generated by these charges, so as to detect the pressure information applied on the piezoelectric film 400 .

Specifically in this embodiment, the first pressure-sensing electrode layer 330 and the second pressure-sensing electrode layer 500 are pasted on the surface of the piezoelectric film 400 by OCA glue, so the charges generated on the surface of the piezoelectric film 400 are induced transmitted to the first pressure-sensing electrode layer 330 and the second pressure-sensing electrode layer 500 .

Specifically, in the embodiment shown in FIG. 1 , two flexible circuit boards are also provided, one of which is bound to the touch-sensing electrode layer 200, and the other flexible circuit board is connected to the second pressure-sensing electrode layer 500 and the conductive leads 340. and the first pressure-sensing electrode layer 330. Specifically, it can be realized through two openings, the first opening runs through the adhesive layer 710 between the piezoelectric film 400 and the second pressure-sensing electrode layer 500, the piezoelectric film 400, the piezoelectric film 400 and the first Adhesive glue layer 710 between pressure-sensing electrode layers 330, first pressure-sensing electrode layer 330, first substrate 310, touch-driving electrode layer 320, and bonding between touch-sensing electrode layer 200 and touch-driving electrode layer 320 The adhesive layer 710, the second opening runs through the adhesive adhesive layer 710 between the touch-sensing electrode layer 200 and the touch-driving electrode layer 320, the first opening communicates with the second opening, and a part of the flexible circuit board is located in the first In the window, the other part is located in the second window, and the two binding regions are on the same side of the flexible circuit board.

Please refer to FIG. 4 together. Specifically, in the embodiment shown in FIG. 2 , a flexible circuit board 800 is also provided, and the entire pressure-sensing touch screen 10 is bound by a flexible circuit board 800 . The flexible circuit board 800 includes three binding areas, and the three binding areas are all located on the same side of the flexible circuit board 800, which are respectively the first binding area 810, the second binding area 820 and the third binding area 830. A binding area 810 is used for binding the touch-sensing electrode layer 200, a second binding area 820 is used for binding the touch-driving electrode layer 320 and conductive leads 340, and a third binding area 830 is used for the second pressure-sensing electrode layer 500 bound. This binding method enables the implementation of the above solution of reducing the thickness of the touch screen by disposing the touch driving electrode layer 320 and the first pressure sensing electrode layer 330 on the first surface 311 and the second surface 312 of the first substrate 310 respectively.

Specifically, it can be realized through three openings, the three openings are respectively the first opening 910, the second opening 920 and the third opening 930, and the second opening 920 is located between the first opening 910 and the third opening 930. Between the openings 930, the second opening 920 communicates with the first opening 910 and the third opening 930 respectively. The first window 910 runs through the adhesive layer 710 between the piezoelectric film 400 and the second pressure-sensing electrode layer 500 , the piezoelectric film 400 , and the adhesive between the piezoelectric film 400 and the first pressure-sensing electrode layer 330 layer 710 , the first pressure-sensing electrode layer 330 , the first substrate 310 and the touch-driving electrode layer 320 . The second opening 920 runs through the adhesive layer 710 between the touch driving electrode layer 320 and the second substrate 610 , the second substrate 610 , the touch sensing electrode layer 200 , and between the touch sensing electrode layer 200 and the protective cover 100 adhesive layer 710. The third opening 930 runs through the adhesive layer 710 between the touch-sensing electrode layer 200 and the protective cover 100 .

The above-mentioned pressure-sensitive touch screen 10 has at least the following advantages:

The first substrate 310 includes a first surface 311 and a second surface 312 opposite to the first surface 311. The first surface 311 faces the protective cover 100. The first conductive layer is directly disposed on the first surface 311 to form a touch drive electrode. Layer 320, the second conductive layer is directly arranged on the second surface 312 to form the first pressure-sensitive electrode layer 330, so the first conductive layer and the second conductive layer are directly formed on the opposite surfaces of the same first substrate 310, reducing the One layer of base material and one layer of adhesive layer for laminating effectively reduce the thickness and simplify the process. The touch driving electrode layer 320 and the touch sensing electrode layer 200 form a touch sensing layer for detecting touch signals. The first pressure-sensing electrode layer 330 and the second pressure-sensing electrode layer 500 are respectively disposed on opposite sides of the piezoelectric film 400 to form a structure for detecting pressure signals.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of pressure sensitive touch-screen, it is characterised in that including：

Touch sensible electrode layer；

Conductive film, including the first base material, the first conductive layer and the second conductive layer, the first base material include first surface and with The second surface that the first surface is oppositely arranged, the first surface is toward the touch sensible electrode layer, described first Conductive layer is directly arranged at the first surface formation and touches drive electrode layer, and the touch sensible electrode layer drives with described touch Moving electrode layer stackup is set and mutually insulated, and second conductive layer is directly arranged at the second surface formation first pressure sense Answer electrode layer；

Piezoelectric membrane, is arranged on the first pressure induction electrode layer；And

Second pressure induction electrode layer, is arranged at the piezoelectric membrane back on the surface of first pressure induction electrode layer, So that the piezoelectric membrane is located between first pressure induction electrode layer and second pressure induction electrode layer.

2. pressure sensitive touch-screen according to claim 1, it is characterised in that offer via in the first base material, The via runs through filled with conductive material formation conductive lead wire in the first surface and the second surface, the via, One end of the conductive lead wire is electrically connected with first pressure induction electrode layer, and the other end of the conductive lead wire is described in The first surface is extended to after via.

3. pressure sensitive touch-screen according to claim 2, it is characterised in that the conductive lead wire includes binding portion, passed through Portion and clinch are worn, the binding portion is located at the first surface, and the through-Penetration portion is located in the via, and the clinch is taken It is connected on the first pressure induction electrode layer, the binding portion and the clinch are connected to the relative of the through-Penetration portion Two ends.

4. pressure sensitive touch-screen according to claim 3, it is characterised in that prolong along its axial direction one end of the through-Penetration portion Stretch to form the first extension, first extending part is in the first surface, for the first base material described in clamping, and described One extension is spaced apart with the binding portion by the via；And/or

The other end of the through-Penetration portion is along its second extension of axially extending formation, and second extending part is in second table Face, for the first base material described in clamping, and second extension is spaced apart with the overlap by the via.

5. pressure sensitive touch-screen according to claim 3, it is characterised in that the clinch includes linkage section, climbing Section and lap segment, the linkage section is connected with the through-Penetration portion, the climbing section positioned at the linkage section and the lap segment it Between, the lap segment is overlapped in the first pressure induction electrode layer surface.

6. pressure sensitive touch-screen according to claim 2, it is characterised in that also including cover sheet, the protection cap Plate includes first side and the second side being oppositely arranged with the first side, and the touch sensible electrode layer is formed directly into The first side of the cover sheet；Or

Also include cover sheet and the second base material, the cover sheet includes first side and is oppositely arranged with the first side Second side, the touch sensible electrode layer is formed on second base material, the touch sensible electrode layer and described Two base materials are arranged at the first side of the cover sheet.

7. pressure sensitive touch-screen according to claim 6, it is characterised in that when the touch-control sensing electrode layer is formed at When on the second base material, the pressure sensitive touch-screen also includes a flexible PCB, and the flexible PCB includes three bindings Area, the respectively first binding area, the second binding area and the 3rd binding area, the first binding area is used for the touch sensible electrode Layer binding, the second binding area is used to bind with the touch drive electrode layer and the conductive lead wire, the 3rd binding Bound for the second pressure induction electrode floor in area.

8. pressure sensitive touch-screen according to claim 1, it is characterised in that also including the 3rd base material, second pressure Power induction electrode layer is arranged on the 3rd base material, between the second pressure induction electrode layer and the piezoelectric membrane, institute State and be respectively arranged with glue line between piezoelectric membrane and first pressure induction electrode layer.

9. a kind of touch display screen, it is characterised in that including：

Pressure sensitive touch-screen as claimed in any of claims 1 to 8 in one of claims；And

Display screen, is arranged at the lower section of the pressure sensitive touch-screen.

10. a kind of electronic equipment, it is characterised in that including：

Touch display screen as claimed in claim 9.