Electronic device, pressure-sensitive touch display and pressure-sensitive touch screen thereof

Abstract

The present invention relates to an electronic device, a pressure-sensitive touch display screen, and a pressure-sensitive touch screen thereof. The pressure-sensitive touch screen includes a first substrate, a driving electrode layer, a piezoelectric film, a first carrier, a touch-sensitive electrode layer, and a pressure-sensitive electrode layer. The touch-sensitive electrode layer and the pressure-sensitive electrode layer are alternately located on the third surface of the first carrier, so that the touch-sensitive electrode and the pressure-sensitive electrode layer are located on the same surface. The driving electrode layer acts as both a touch-driven electrode layer and a pressure-driven electrode layer in a time-sharing manner, so that it can sense the magnitude of touch action and pressure at the same time. Compared with traditional solutions, the pressure-sensitive electrode layer is closer to the touch surface. When a touch action occurs on the touch surface, the strength of the detected pressure signal can be effectively guaranteed. Moreover, the driving electrode layer acts as a common driving electrode layer for touch and pressure sensing, which reduces the number of electrode layers and helps to reduce the overall thickness of the pressure-sensitive touch screen.

Description

Technical Field

[0001] The present invention relates to the field of touch control technology, and in particular to an electronic device, a pressure-sensitive touch display screen and a pressure-sensitive touch screen thereof. Background Art

[0002] Touchscreen displays offer immense convenience. Electronic devices with touchscreens, such as smartphones and tablets, have become a fixture of everyday life. Today, user experience is no longer limited to the touch experience within the existing display screen. Pressure-sensitive touch, which can detect the force of a touch, has become a new pursuit, offering broad development prospects in areas such as office work, gaming, and painting.

[0003] Traditional pressure-sensitive touchscreens typically use capacitive or resistive solutions, placing additional pressure-sensing electrodes or pressure sensors beneath the touch module. This placement distances the pressure-sensing electrodes or pressure sensors from the touch surface of the touch module. Because pressure and screen deformation weaken as they travel toward the bottom of the screen, this arrangement reduces the detected pressure signal. Summary of the Invention

[0004] Based on this, it is necessary to provide an electronic device, a pressure-sensitive touch display and a pressure-sensitive touch screen thereof that can effectively ensure the strength of the detected pressure signal in order to address the above technical problems.

[0005] A pressure-sensitive touch screen, comprising:

[0006] The first substrate comprises a first surface and a second surface opposite to each other;

[0007] a driving electrode layer, disposed on the first surface of the first substrate, the driving electrode layer comprising a plurality of driving electrodes extending along a first direction and spaced apart along a second direction;

[0008] a piezoelectric film, disposed on a side of the driving electrode layer away from the first substrate;

[0009] A first carrier includes a third surface and a fourth surface disposed opposite to each other, wherein the third surface faces the piezoelectric film;

[0010] a touch sensing electrode layer, disposed on the third surface of the first carrier, the touch sensing electrode layer comprising a plurality of touch sensing electrodes extending along the second direction and arranged at intervals along the first direction; and

[0011] The pressure sensing electrode layer is arranged on the third surface of the first carrier, and includes a plurality of pressure sensing electrodes extending along the second direction and arranged at intervals along the first direction. The touch sensing electrodes and the pressure sensing electrodes are alternately arranged.

[0012] The above-mentioned pressure-sensitive touch screen has at least the following advantages:

[0013] The touch sensing electrode layer and the pressure sensing electrode layer are alternately located on the third surface of the first carrier, so that the touch sensing electrodes and the pressure sensing electrode layer are located on the same surface; the driving electrode layer acts as both a touch driving electrode layer and a pressure driving electrode layer in a time-sharing manner, so it can sense touch action and pressure simultaneously. Because the pressure sensing electrode layer and the touch sensing electrode layer are located on the same surface, the pressure sensing electrode layer is closer to the touch surface than when the pressure sensor or pressure sensing electrode is traditionally placed below the touch module. When a touch action occurs on the touch surface, the strength of the detected pressure signal can be effectively guaranteed. In addition, the driving electrode layer serves as a common driving electrode layer for touch and pressure sensing, which reduces the number of electrode layers and helps reduce the overall thickness of the pressure-sensitive touch screen.

[0014] In one embodiment, the first carrier is a protective cover, and the touch-sensing electrode layer and the pressure-sensing electrode layer are formed directly on the surface of the protective cover facing the piezoelectric film. This eliminates the need for a substrate and a transparent adhesive layer between the protective cover and the touch-sensing and pressure-sensing electrode layers, thereby reducing the overall thickness and improving bending resistance.

[0015] In one embodiment, the first carrier is a second substrate, and the touch-sensing electrode layer and the pressure-sensing electrode layer are formed directly on the surface of the second substrate facing the piezoelectric film. This eliminates the need for a transparent adhesive layer between the protective cover and the touch-sensing electrode layer and the pressure-sensing electrode layer, thereby reducing the overall thickness.

[0016] In one embodiment, a protective cover is further included, and the protective cover is located on a side of the second substrate that is away from the touch sensing electrode layer and the pressure sensing electrode layer. The protective cover is used to protect the second substrate.

[0017] In one embodiment, the driving electrodes are provided with a plurality of windows extending through two opposing surfaces of the driving electrodes. The projections of the pressure sensing electrodes on the driving electrodes overlap with the driving electrodes, and the windows are located within the overlapping areas. This reduces the area of ​​direct contact between the pressure sensing electrode layer and the driving electrode layer, thereby reducing capacitive interference generated by a finger touch and improving the signal-to-noise ratio.

[0018] In one embodiment, a conductive block electrically isolated from the drive electrode is disposed within the window, with a gap between the conductive block and the inner sidewall of the window. Because the conductive block is electrically isolated from the drive electrode, no electrical signal is generated between the pressure sensing electrode and the conductive block. Furthermore, the conductive block within the window ensures that the light transmittance of the windowed area is similar to that of the non-windowed area, preventing the pressure-sensitive touch screen from experiencing alternating light and dark visual effects.

[0019] In one embodiment, the spacing is 10μm to 100μm. When the spacing between the conductive block and the inner sidewall of the window is less than 10μm, on the one hand, it is easy for the conductive block and the inner sidewall of the window to short-circuit, resulting in incomplete electrical isolation between the conductive block and the drive electrode, resulting in the effect of reducing the noise of finger touch by reducing the amount of picked-up polarization charge is not obvious. On the other hand, a spacing less than 10μm increases the process difficulty. When the spacing between the conductive block and the inner sidewall of the window is greater than 100μm, it is easy for the etched lines to be visible to the user; therefore, a spacing of 10μm to 100μm is appropriate.

[0020] In one embodiment, the spacing is 70 μm. This prevents the conductive block from being easily short-circuited with the inner wall of the window, which would result in incomplete electrical isolation between the conductive block and the drive electrode, thereby reducing the effect of reducing the amount of polarized charge picked up to reduce the noise of finger touch, and also prevents obvious etching marks on the drive electrode.

[0021] In one embodiment, the driving electrode has an elongated strip structure, and the overlapping region of one driving electrode and one pressure sensing electrode has at least two windows, with the at least two windows spaced apart. Because the driving electrode in the windowed region is removed, the conductivity of the driving electrode may be affected. By providing at least two spaced-apart windows, conductive portions of the driving electrode are still distributed along the sidewalls of each adjacent window. This ensures that the conductive performance of the driving electrode is maintained while minimizing the area of ​​direct contact between the driving electrode and the pressure sensing electrode.

[0022] A pressure-sensitive touch display screen, comprising:

[0023] A pressure sensitive touch screen as described in any one of the above; and

[0024] The display screen is stacked with the pressure-sensitive touch screen.

[0025] An electronic device, comprising:

[0026] A pressure-sensitive touch display as described above.

[0027] The above-mentioned electronic device and pressure-sensitive touch display screen have at least the following advantages:

[0028] The touch sensing electrode layer and the pressure sensing electrode layer of the pressure sensing touch screen are alternately located on the third surface of the first carrier, so the touch sensing electrode and the pressure sensing electrode layer are located on the same surface, and the driving electrode layer acts as both a touch driving electrode layer and a pressure driving electrode layer in a time-sharing manner, so it can sense the touch action and the size of the pressure at the same time. Because the pressure sensing electrode layer and the touch sensing electrode layer are located on the same surface, the pressure sensing electrode layer is closer to the touch surface than when the pressure sensor or pressure sensing electrode is traditionally placed below the touch module. When a touch action occurs on the touch surface, the strength of the detected pressure signal can be effectively guaranteed, and the driving electrode layer serves as a common driving electrode layer for touch and pressure sensing, which reduces the number of electrode layers and helps to reduce the overall thickness of the pressure sensing touch screen. The display screen and the pressure sensing touch screen are stacked. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the pressure-sensitive touch screen in the first embodiment;

[0030] Figure 2 for Figure 1 A top view of the pressure-sensitive touch screen shown;

[0031] Figure 3 for Figure 2 A partial schematic diagram in ;

[0032] Figure 4 for Figure 1 A top view of the pressure sensing electrode layer and the pressure sensing electrode leads being arranged on the first carrier;

[0033] Figure 5 for Figure 1 A top view of the driving electrode layer and the driving electrode leads being arranged on the first substrate;

[0034] Figure 6 is a schematic diagram of the projection of the pressure sensing electrode on the driving electrode in one embodiment;

[0035] Figure 7 is a schematic diagram of the projection of the pressure sensing electrode on the driving electrode in another embodiment;

[0036] Figure 8 FIG. 4 is a cross-sectional view of a pressure-sensitive touch screen according to a second embodiment. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The various technical features of the embodiments described above may be combined arbitrarily. To simplify the description, not all possible combinations of the various technical features in the embodiments described above are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] In one embodiment, an electronic device includes a pressure-sensitive touch display. For example, the electronic device may be a smartphone, a tablet computer, a car navigation system, etc. The pressure-sensitive touch display includes a pressure-sensitive touch screen and a display, and the pressure-sensitive touch screen and the display are stacked.

[0041] See also Figure 1 and Figure 2 The pressure-sensitive touch screen 10 in the first embodiment includes a first substrate 100, a driving electrode layer 200, a piezoelectric film 300, a first carrier, a touch-sensing electrode layer 400, and a pressure-sensing electrode layer 500. The first substrate 100 includes a first surface 110 and a second surface 120 disposed opposite to each other.

[0042] The drive electrode layer 200 is disposed on the first surface 110 of the first substrate 100. Specifically, the drive electrode layer 200 can be directly formed on the first surface 110 of the first substrate 100 by etching the conductive layer on the first surface of the first substrate 100. The drive electrode layer 200 includes a plurality of drive electrodes 210 extending along a first direction and spaced apart along a second direction. In this embodiment, the first direction and the second direction are perpendicular to each other.

[0043] Specifically, in the first embodiment, each driving electrode 210 is a long strip structure, and each driving electrode 210 is insulated from each other. For example, the driving electrode 210 can be rectangular. Of course, in other embodiments, the driving electrodes 210 can also be a long strip structure formed by alternating rhombuses and squares.

[0044] In the first embodiment, the driving electrode layer 200 acts as a touch driving electrode layer in a time-sharing manner, and together with the touch sensing electrode layer 400 forms a touch structure that can obtain user touch position information; the driving electrode layer 200 also acts as a pressure driving electrode layer, and together with the pressure sensing electrode layer 500 forms a pressure sensing structure that can sense the pressure sensing size.

[0045] Specifically, in the first embodiment, a driving electrode lead 220 is further included, and the driving electrode lead 220 is electrically connected to the driving electrode 210. For example, each driving electrode 210 is extended to the edge area through a driving electrode lead 220, and then electrically connected to the circuit board by binding.

[0046] The piezoelectric film 300 is disposed on the side of the drive electrode layer 200 that is away from the first substrate 100. Specifically, the piezoelectric film 300 is located between the drive electrode layer 200 and the touch-sensing electrode layer 400 and the pressure-sensing electrode layer 500. When a finger presses the touch surface of the pressure-sensitive touch screen 10, the piezoelectric film 300 deforms under the pressure, generating polarized charges on its upper and lower surfaces. The drive electrode layer 200 and the pressure-sensing electrode layer 500 detect these polarized charges and generate piezoelectric signals, thereby detecting the magnitude of the pressure.

[0047] The first carrier includes a third surface and a fourth surface disposed opposite each other, with the third surface facing the piezoelectric film 300. The touch sensing electrode layer 400 and the pressure sensing electrode layer 500 are both disposed on the third surface of the first carrier and are insulated from each other.

[0048] Specifically in the first embodiment, the first carrier is a protective cover 600. The protective cover 600 can be rigid or flexible. Therefore, the touch sensing electrode layer 400 and the pressure sensing electrode layer 500 are both disposed on the surface of the protective cover 600 facing the piezoelectric film 300. The surface of the protective cover 600 facing the piezoelectric film 300 is the third surface.

[0049] For example, the touch-sensing electrode layer 400 and the pressure-sensing electrode layer 500 can be formed directly on the surface of the protective cover 600 facing the piezoelectric film 300 through an exposure-development process. Thus, a substrate layer and a transparent adhesive layer between the protective cover 600 and the touch-sensing electrode layer 400 and the pressure-sensing electrode layer 500 are eliminated, which helps reduce the overall thickness and improves the bending resistance.

[0050] Of course, see Figure 8 In the second embodiment, the first carrier may be the second substrate 700 , and the touch sensing electrode layer 400 and the pressure sensing electrode layer 500 are both directly formed on the surface of the second substrate 700 facing the piezoelectric film 300 .

[0051] Specifically in the second embodiment, the second substrate 700 can be made of the same material as the first substrate 100, or a different material from the first substrate 100. The pressure-sensitive touch screen 10 in the second embodiment further includes a protective cover 600, which is located on the side of the second substrate 700 facing away from the touch-sensing electrode layer 400 and the pressure-sensing electrode layer 500. The protective cover 600 is used to protect the second substrate 700 and can be rigid or flexible.

[0052] Please also refer to Figure 3 and Figure 4 The touch sensing electrode layer 400 includes a plurality of touch sensing electrodes 410 extending along the second direction and spaced apart along the first direction. The pressure sensing electrode layer 500 includes a plurality of pressure sensing electrodes 510 extending along the second direction and spaced apart along the first direction. The touch sensing electrodes 410 and the pressure sensing electrodes 510 are alternately arranged. That is, the touch sensing electrodes 410 and the pressure sensing electrodes 510 are located on the same surface.

[0053] Specifically, in this embodiment, each touch sensing electrode 410 is located between every two adjacent pressure sensing electrodes 510. Of course, in other embodiments, every two touch sensing electrodes 410 may be located between every two adjacent pressure sensing electrodes 510. This is sufficient as long as the touch sensing electrodes 410 and the pressure sensing electrodes 510 are alternately arranged.

[0054] The pressure-sensitive touch screen 10 further includes pressure-sensitive electrode leads 520 and touch-sensitive electrode leads 420 . The pressure-sensitive electrode leads 520 are electrically connected to the pressure-sensitive electrodes 510 , and the touch-sensitive electrode leads 420 are electrically connected to the touch-sensitive electrodes 410 .

[0055] Specifically, in the first embodiment, multiple pressure-sensing electrodes 510 are led out from the same pressure-sensing electrode lead 520, thereby reducing the required frame size and adapting to narrow frame solutions. Of course, in other embodiments, one pressure-sensing electrode 510 can also be led out from one pressure-sensing electrode lead 520.

[0056] Specifically in the first embodiment, each touch sensing electrode 410 is led out by one touch sensing electrode lead 420. Of course, in other embodiments, one touch sensing electrode 410 may be led out by multiple touch sensing electrode leads 420, thereby preventing unresponsiveness caused by breakage of the touch sensing electrode lead 420.

[0057] When a finger touches the touch surface of the pressure-sensitive touch screen 10, the electrostatic field generated by the human body partially polarizes the piezoelectric film 300, generating interfering polarized charges on both the upper and lower surfaces of the piezoelectric film 300. These interfering polarized charges, when picked up by the pressure-sensing electrode layer 500, generate spurious piezoelectric signals, or noise. The magnitude of this noise is directly related to the magnitude of the electrostatic field and the amount of polarized charges picked up.

[0058] Because the magnitude of the electrostatic field is related to the body's charge and cannot be controlled, this embodiment reduces the amount of polarized charge picked up to reduce the noise generated by finger touches. Because polarization is concentrated between the overlapping pressure-sensing electrodes 510 and drive electrodes 210 where a finger touches, reducing the area directly facing each other between the drive electrode layer 200 and the pressure-sensing electrode layer 500 can reduce the noise generated by finger touches.

[0059] See also Figures 5 to 7 The driving electrode 210 is provided with a plurality of windows 211 extending through two opposing surfaces of the driving electrode 210. The projection of the pressure sensing electrode 510 on the driving electrode 210 overlaps with the driving electrode 210 in an area S, and the windows 211 are located within the overlapping area S. The provision of the windows 211 reduces the area of ​​facing between the driving electrode layer 200 and the pressure sensing electrode layer 500.

[0060] See also Figure 6 In one embodiment, the portion of the driving electrode 210 corresponding to the window 211 is removed. That is, there is neither a portion of the driving electrode 210 nor a separate conductive block in the window 211. Therefore, the process is simple and efficient.

[0061] See also Figure 7In another embodiment, a conductive block 212 electrically isolated from the drive electrode 210 is disposed within the window 211, with a gap between the conductive block 212 and the inner sidewall of the window 211. Because the conductive block 212 is electrically isolated from the drive electrode 210, no electrical signal is generated between the pressure sensing electrode 510 and the conductive block 212. Furthermore, the conductive block 212 within the window 211 can ensure that the light transmittance of the window 211 area and the non-window 211 area is close, preventing the pressure-sensitive touch screen 10 from producing a visual effect of alternating light and dark.

[0062] exist Figure 7 In the embodiment shown, the conductive block 212 can be formed by providing a frame-shaped window 211 to separate the conductive block 212 from the non-window 211 portion of the driving electrode 210. In this way, the conductive block 212 and the driving electrode 210 have the same material and transparency.

[0063] The overlapping region S between a driving electrode 210 and a pressure sensing electrode 510 has at least one window 211, preferably at least two windows. Because the driving electrode 210 in the region of the window 211 is removed, the conductivity of the driving electrode 210 may be affected. However, by providing at least two windows 211 spaced apart from each other, the sidewalls of each adjacent window 211 still retain a portion of the driving electrode 210 with conductive properties. This ensures that the conductive properties of the driving electrode 210 are maintained while minimizing the area of ​​direct contact between the driving electrode 210 and the pressure sensing electrode 510.

[0064] The above-mentioned electronic device and pressure-sensitive touch display screen have at least the following advantages:

[0065] The touch sensing electrode layer 400 and the pressure sensing electrode layer 500 of the pressure-sensitive touch screen 10 are alternately located on the third surface of the first carrier. Therefore, the touch sensing electrodes 410 and the pressure sensing electrodes 510 are located on the same surface. The driving electrode layer 200 functions as both the touch driving electrode layer 200 and the pressure driving electrode layer 200 in a time-sharing manner, thereby simultaneously sensing touch actions and the magnitude of pressure. Because the pressure sensing electrode layer 500 and the touch sensing electrode layer 400 are located on the same surface, the pressure sensing electrode layer 500 is closer to the touch surface than in the conventional method of placing the pressure sensor or pressure sensing electrode 510 below the touch module. When a touch action occurs on the touch surface, the strength of the detected pressure signal can be effectively guaranteed. Furthermore, the driving electrode layer 200 serves as a common driving electrode layer 200 for touch and pressure sensing, reducing the number of electrode layers and facilitating a reduction in the overall thickness of the pressure-sensitive touch screen 10. The display screen and the pressure-sensitive touch screen 10 are stacked.

[0066] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A pressure-sensitive touch screen, characterized in that: include: The first substrate comprises a first surface and a second surface opposite to each other; a driving electrode layer disposed on the first surface of the first substrate, the driving electrode layer comprising a plurality of driving electrodes extending along a first direction and spaced apart along a second direction, wherein the first direction and the second direction are perpendicular to each other; a piezoelectric film, disposed on a side of the driving electrode layer away from the first substrate; A first carrier includes a third surface and a fourth surface disposed opposite to each other, wherein the third surface faces the piezoelectric film; a touch sensing electrode layer, disposed on the third surface of the first carrier, the touch sensing electrode layer comprising a plurality of touch sensing electrodes extending along the second direction and spaced apart along the first direction, each of the touch sensing electrodes being led out by a touch sensing electrode lead, or each of the touch sensing electrodes being led out by multiple touch sensing electrode leads; and a pressure-sensing electrode layer disposed on the third surface of the first carrier, the pressure-sensing electrode layer comprising a plurality of pressure-sensing electrodes extending along the second direction and spaced apart along the first direction, the touch-sensing electrodes and the pressure-sensing electrodes being alternately disposed, and the plurality of pressure-sensing electrodes being led out from the same pressure-sensing electrode lead; The touch sensing electrodes and the pressure sensing electrodes are alternately arranged, including: each touch sensing electrode is located between every two adjacent pressure sensing electrodes, or every two touch sensing electrodes are located between every two adjacent pressure sensing electrodes.

2. The pressure-sensitive touch screen according to claim 1, wherein: The first carrier is a protective cover plate, and the touch sensing electrode layer and the pressure sensing electrode layer are both directly formed on a surface of the protective cover plate facing the piezoelectric film.

3. The pressure-sensitive touch screen according to claim 1, wherein: The first carrier is a second substrate, and the touch sensing electrode layer and the pressure sensing electrode layer are both directly formed on a surface of the second substrate facing the piezoelectric film.

4. The pressure-sensitive touch screen according to claim 3, wherein: A protective cover is also included. The protective cover is located on a side of the second substrate that is away from the touch sensing electrode layer and the pressure sensing electrode layer.

5. The pressure-sensitive touch screen according to claim 1, wherein: The driving electrode is provided with a plurality of windows penetrating two opposite surfaces of the driving electrode. The projection of the pressure sensing electrode on the driving electrode has an overlapping area with the driving electrode, and the windows are located in the overlapping area.

6. The pressure-sensitive touch screen according to claim 5, wherein: A conductive block electrically separated from the driving electrode is provided in the window, and a distance is provided between the conductive block and an inner sidewall of the window.

7. The pressure-sensitive touch screen according to claim 6, wherein: The spacing is 10 μm to 100 μm.

8. The pressure-sensitive touch screen according to claim 7, wherein: The pitch is 70 μm.

9. The pressure-sensitive touch screen according to claim 5, wherein: The driving electrode is a long strip structure. The overlapping area of ​​one driving electrode and one pressure sensing electrode has at least two windows, and the at least two windows are arranged at intervals.

10. A pressure-sensitive touch display screen, characterized in that: include: The pressure-sensitive touch screen according to any one of claims 1 to 9; and The display screen is stacked with the pressure-sensitive touch screen.

11. An electronic device, characterized in that: include: The pressure-sensitive touch display screen as claimed in claim 10.

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