Touch screen integrated with piezoelectric transducer and electronic equipment

Abstract

The utility model discloses a touch screen integrated with piezoelectric transducer and electronic equipment, and relates to the field of display module, the touch screen comprises a cover plate, a touch function layer and a flexible circuit board, the touch function layer is attached to the back of the cover plate, the piezoelectric transducer is attached to the back of the cover plate, the piezoelectric transducer is arranged around the touch function layer, and the flexible circuit board is arranged on the cover plate. The piezoelectric transducer and the touch function layer are electrically connected with the flexible circuit board, and the piezoelectric transducer realizes mutual conversion between electric energy and mechanical energy of the piezoelectric transducer according to a positive and negative piezoelectric effect; according to the utility model, the touch function layer is arranged on the back surface of the cover plate, and the piezoelectric transducer is arranged on the back surface of the cover plate, so that electric energy is converted into mechanical energy, and the piezoelectric transducer deforms, pushes the cover plate to vibrate in a reciprocating manner and then pushes air to make a sound, thereby improving the air tightness and waterproofness of the electronic equipment, improving the reliability of the electronic equipment, and improving the reliability of the electronic equipment. The use environment of the electronic equipment is broadened, the service life of the electronic equipment is prolonged, and the market competitiveness of electronic products is improved.

Description

Technical Field

[0001] This utility model relates to the field of display module technology, and in particular to a touch screen and electronic device with an integrated piezoelectric transducer. Background Technology

[0002] With the advancement of technology and the improvement of living standards, smart wearable devices such as watches and bracelets are becoming increasingly common, and the functions integrated into these products are becoming more and more comprehensive. Among them, the call function is a standard feature of children's wearable products. When a call or message is received, the watch will vibrate to remind the user. The conventional product design integrates a motor on the motherboard of the children's watch to realize the vibration reminder for incoming calls or messages, and places the earpiece in the opening on the top cover or side of the device. For example, patent application number 201822221083.3 discloses a 4G artificial intelligence watch, which includes a motor 27 for vibration reminders. The motor 27 reminds the user by vibration, so that the user can perceive tasks such as exercise progress, SMS notifications, and incoming calls in real time. The motor 27 is coupled to the main control board 12. The bottom shell 113 is provided with a first limiting protrusion 115 for limiting the motor 27. The first limiting protrusion 115 can effectively limit and fix the motor 27. The smart watch 10 also includes a speaker 22 and a microphone. The speaker 22 is coupled to the main control board 12 through a second flexible circuit board 123. The middle shell 112 is provided with a watch strap 25 on two opposite sides. The speaker 22 and the microphone are respectively provided on the two sides of the middle shell 112 where the watch strap 25 is located. The middle shell 112 is provided with a broadcast hole 117 and a receiver hole 118 at the positions where the speaker 22 and the microphone are installed. The broadcast hole 117 and the receiver hole 118 are respectively provided on two opposite sides of the middle shell 112. In this design, the presence of the microphone and receiver holes results in poor airtightness and waterproofing, making the equipment prone to water ingress and damage, leading to low reliability and limited use. Therefore, this invention discloses a touchscreen and electronic device integrating a piezoelectric transducer to solve these problems. Utility Model Content

[0003] Based on this, it is necessary to address the aforementioned technical problems by providing a touch screen and electronic device integrating a piezoelectric transducer. This device achieves touch functionality by setting a touch layer on the back of a cover plate, and a piezoelectric transducer is also located on the back of the cover plate. The touch control and the piezoelectric transducer share a flexible circuit board. Under the control of the flexible circuit board, the piezoelectric transducer undergoes an inverse piezoelectric effect, converting electrical energy into mechanical energy. This causes the piezoelectric transducer to deform, repeatedly pushing the cover plate to vibrate, which in turn pushes the air to produce sound. This replaces traditional motor vibration, eliminating the need for speakers and receivers, and eliminating the need for openings in the device casing. This improves the airtightness and waterproofness of the electronic device, thereby enhancing its reliability, broadening its application environment, extending its lifespan, and increasing its market competitiveness.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A touch screen integrating a piezoelectric transducer includes a cover plate, a touch functional layer, and a flexible circuit board. The touch functional layer is attached to the back of the cover plate and is electrically connected to the flexible circuit board. A piezoelectric transducer is attached to the back of the cover plate, surrounds the touch functional layer, and is electrically connected to the flexible circuit board. The piezoelectric transducer realizes the mutual conversion of electrical energy and mechanical energy based on the forward and inverse piezoelectric effects.

[0006] In a preferred embodiment of the touch screen of the integrated piezoelectric transducer provided by this utility model, the cover plate is circular.

[0007] In a preferred embodiment of the touch screen with integrated piezoelectric transducer provided by this utility model, the cover plate includes a visible area and a non-visual area, the touch function layer is disposed in the visible area, and the piezoelectric transducer is disposed in either the visible area or the non-visual area.

[0008] In a preferred embodiment of the touch screen with the integrated piezoelectric transducer provided by this utility model, the piezoelectric transducer has a ring-shaped encapsulation structure and is transparent, and the piezoelectric transducer is bonded and fixed to the cover plate by an adhesive layer.

[0009] In a preferred embodiment of the touch screen with the integrated piezoelectric transducer provided by this utility model, the adhesive layer is an OCA optical adhesive layer with a thickness of 0.15mm.

[0010] In a preferred embodiment of the touch screen with the integrated piezoelectric transducer provided by this utility model, the touch function layer is a resistive touch layer, which includes a first film ITO sensor layer and a second film ITO sensor layer. The second film ITO sensor layer is bonded to the first film ITO sensor layer through a second adhesive layer, and the first film ITO sensor layer is bonded to the back of the cover plate through a first adhesive layer.

[0011] In a preferred embodiment of the touch screen with the integrated piezoelectric transducer provided by this utility model, both the first adhesive layer and the second adhesive layer are transparent OCA layers, the thickness of the first adhesive layer is 0.125mm, and the thickness of the second adhesive layer is 0.05mm.

[0012] In a preferred embodiment of the touch screen of the integrated piezoelectric transducer provided by this utility model, the cover plate is provided with an annular ink layer around its perimeter, and scale lines are provided along the annular ink layer.

[0013] In a preferred embodiment of the touch screen with the integrated piezoelectric transducer provided by this utility model, a ZIF connector and electronic components are mounted on the flexible circuit board, and the flexible circuit board is provided with a gold finger insertion end.

[0014] An electronic device comprising a touchscreen with the aforementioned integrated piezoelectric transducer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This utility model provides a touch screen and electronic device with an integrated piezoelectric transducer. Touch functionality is achieved by setting a touch layer on the back of a cover plate, and a piezoelectric transducer is also located on the back of the cover plate. The touch control and the piezoelectric transducer share a flexible circuit board. Under the control of the flexible circuit board, the piezoelectric transducer undergoes an inverse piezoelectric effect, converting electrical energy into mechanical energy. This causes the piezoelectric transducer to deform, repeatedly pushing the cover plate to vibrate, which in turn pushes the air to produce sound. This replaces traditional motor vibration, eliminating the need for speakers and receivers, and eliminating the need for openings in the device casing. This improves the airtightness and waterproofness of the electronic device, thereby enhancing its reliability, broadening its application environment, extending its lifespan, and increasing its market competitiveness. Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic plan view of the overall structure of the touch screen with the integrated piezoelectric transducer provided by this utility model;

[0019] Figure 2 A side view of the overall structure of the touch screen with the integrated piezoelectric transducer provided by this utility model;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 A schematic diagram of the cover plate structure of the integrated piezoelectric transducer provided by this utility model in the touch screen.

[0022] The markings in the diagram are explained as follows:

[0023] 1. Cover plate; 101. Visible area; 102. Non-visible area; 2. Touch function layer; 201. First film ITO sensor layer; 202. Second film ITO sensor layer; 203. First adhesive layer; 204. Second adhesive layer; 3. Flexible circuit board; 4. Piezoelectric transducer; 5. ZIF connector; 6. Electronic components; 7. Gold finger insertion terminal; 8. Annular ink layer; 9. Scale line; 10. Protective film; 11. Adhesive layer. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] As described in the background section, conventional product designs integrate a motor onto the mainboard of a children's watch to provide vibration alerts for incoming calls or messages, and place the earpiece in an opening on the top cover or side of the device. Due to the presence of the microphone and receiver holes, the watch suffers from poor airtightness and waterproofing, making it prone to water ingress and damage, resulting in low reliability and limited usability.

[0026] To address this technical problem, this invention provides a touch screen and electronic device with an integrated piezoelectric transducer, which is applied in the field of display modules.

[0027] For details, please refer to Figure 1-4 The integrated piezoelectric transducer touch screen specifically includes a cover plate 1, a touch function layer 2, and a flexible circuit board 3. The touch function layer 2 is attached to the back of the cover plate 1 and is electrically connected to the flexible circuit board 3. A piezoelectric transducer 4 is attached to the back of the cover plate 1. The piezoelectric transducer 4 is arranged around the touch function layer 2 and is electrically connected to the flexible circuit board 3. The piezoelectric transducer 4 realizes the mutual conversion of electrical energy and mechanical energy of the piezoelectric transducer 4 according to the forward and reverse piezoelectric effects.

[0028] The electronic device includes a touchscreen with the aforementioned integrated piezoelectric transducer.

[0029] The touch screen and electronic device with integrated piezoelectric transducer provided by this utility model realizes the touch function by setting a touch function layer 2 on the back of the cover plate 1, and setting a piezoelectric transducer 4 on the back of the cover plate 1. The touch control and the piezoelectric transducer 4 share a flexible circuit board 3. Under the control of the flexible circuit board 3, the piezoelectric transducer 4 undergoes the inverse piezoelectric effect, which converts electrical energy into mechanical energy, causing the piezoelectric transducer 4 to deform and reciprocate to push the cover plate 1 to vibrate, which in turn pushes the air to produce sound. This replaces the traditional motor vibration, eliminates the need for speakers and receivers, and eliminates the need for openings in the device casing. This improves the airtightness and waterproofness of the electronic device, thereby improving the reliability of the electronic device, broadening the application environment of the electronic device, increasing the service life of the electronic device, and enhancing the market competitiveness of electronic products.

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] Please refer to Figure 1-4 A touch screen with an integrated piezoelectric transducer is provided, which includes a cover plate 1, a touch functional layer 2 and a flexible circuit board 3. The touch functional layer 2 is attached to the back of the cover plate 1 and is electrically connected to the flexible circuit board 3. A piezoelectric transducer 4 is attached to the back of the cover plate 1, and the piezoelectric transducer 4 is arranged around the touch functional layer 2 and is electrically connected to the flexible circuit board 3. The piezoelectric transducer 4 realizes the mutual conversion of electrical energy and mechanical energy of the piezoelectric transducer 4 according to the forward and reverse piezoelectric effects.

[0034] In this example, the cover plate 1 is circular, the piezoelectric transducer 4 on it is annular, and the touch functional layer 2 is also circular. Of course, the cover plate 1 can also be other shapes, such as rectangles, and the matching touch functional layer 2 can also be rectangular to match its shape. The cover plate 1 is a glass cover plate 1, made of Corning Gorilla Glass, Panda Glass, or Sapphire, or it can be made of other high-transmittance materials, such as UTG (Ultra Thin Glass), CPI (Colorless Polyimide), PET (Polyethylene Terephthalate), etc., which are transparent, soft, and foldable materials.

[0035] Furthermore, a protective film 10 with a tear handle is affixed to the upper surface of the cover plate 1 to protect the surface of the cover plate 1.

[0036] The cover plate 1 includes a visible area 101 and a non-visual area 102. The touch function layer 2 is located in the visible area 101. The piezoelectric transducer 4 can be located in the visible area 101 or the non-visual area 102. The piezoelectric transducer 4 has a ring-shaped encapsulation structure. The piezoelectric transducer 4 is bonded and fixed to the cover plate 1 through the adhesive layer 11. The piezoelectric transducer 4 can vibrate the periphery of the cover plate 1, thereby improving the vibration effect.

[0037] In this example, the piezoelectric transducer 4 is made of a transparent material, such as zinc oxide, barium titanate (BaTiO3), aluminum nitride, polyvinylidene fluoride (PVDF), or lanthanum-doped lead zirconate titanate (PLZT), thus creating a transparent piezoelectric transducer 4. This allows the piezoelectric transducer 4 to be attached to the visible area 101 of the cover plate 1. The transparent piezoelectric transducer 4 allows the cover plate 1 to vibrate without affecting the display effect in the visible area. The adhesive layer 11 is an OCA optical adhesive layer with a thickness of 0.15 mm, used to bond and fix the piezoelectric transducer 4.

[0038] Of course, the piezoelectric transducer 4 can also be made of an opaque material, in which case the piezoelectric transducer 4 needs to be placed in the non-viewing area 102 of the cover plate 1.

[0039] The touch function layer 2 adopts a resistive touch layer, which includes a first film ITO sensor layer 201 and a second film ITO sensor layer 202. The second film ITO sensor layer 202 is bonded to the first film ITO sensor layer 201 through a second adhesive layer 204. The first film ITO sensor layer 201 is bonded to the back of the cover plate 1 through a first adhesive layer 203. Both the first adhesive layer 203 and the second adhesive layer 204 are transparent OCA layers. The thickness of the first adhesive layer 203 is 0.125mm, and the thickness of the second adhesive layer 204 is 0.05mm. The ITO sensor is an indium tin oxide sensor, which is the sensing electrode layer. Compared with capacitive touch layers, resistive touch layers can be touched by any object, such as fingers, styluses, or other items, as long as a certain pressure is applied to make the two conductive layers contact. The structure is relatively simple and the manufacturing cost is relatively low. Especially in some devices with low requirements for touch performance and small size, resistive touch screens have a cost advantage. It is unaffected by dust, water, and dirt, has good environmental adaptability, can be used in harsh environments (humid, wet, dirty), and will never deviate after one calibration, making it suitable for use in outdoor equipment and other scenarios with high environmental requirements.

[0040] The flexible circuit board 3 is equipped with ZIF connectors 5 and electronic components 6, and has gold finger insertion terminals 7. The flexible circuit board 3 is electrically connected to the main board of the whole machine to realize circuit control. In order to improve the vibration effect, the main board of the whole machine can integrate a Synaptic audio amplifier for sound processing.

[0041] The touchscreen of the integrated piezoelectric transducer 4 provided in Example 1 is further optimized, specifically, as follows: Figure 1 , 4 As shown, the cover plate 1 has an annular ink layer 8 around its perimeter, and scale lines 9 are provided along the annular ink layer 8. The scale lines 9 and the annular ink layer 8 have a clear color difference. The annular ink layer 8 is located in the non-viewing area 102, and the annular ink layer 8 is black ink screen-printed on the back of the cover plate 1. The scale lines 9 can be cut out without screen-printing black ink, so that when the backlight is bright, the scale lines 9 will light up, thus making the scale lines 9 clearly distinguishable.

[0042] This embodiment provides an electronic device, which includes a touch screen with an integrated piezoelectric transducer 4, one of the embodiments 1 or 2. The electronic device can be a smart wearable device, such as a watch or a bracelet, or a smartphone, or other electronic devices.

[0043] The working principle of the touch screen and electronic device with integrated piezoelectric transducer 4 provided by this utility model is as follows: By setting a touch function layer 2 on the back of the cover plate 1, the touch function is realized. The piezoelectric transducer 4 is set on the back of the cover plate 1. The touch function and the piezoelectric transducer 4 share a flexible circuit board 3. Under the control of the flexible circuit board 3, the piezoelectric transducer 4 undergoes the inverse piezoelectric effect, which converts electrical energy into mechanical energy, causing the piezoelectric transducer 4 to deform and reciprocate to push the cover plate 1 to vibrate, which in turn pushes the air to produce sound. This replaces the traditional motor vibration, eliminating the need for speakers and receivers and eliminating the need for openings in the device casing. This improves the airtightness and waterproofness of the electronic device, thereby improving the reliability of the electronic device, broadening the application environment of the electronic device, increasing the service life of the electronic device, and enhancing the market competitiveness of electronic products.

[0044] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A touchscreen integrating a piezoelectric transducer, comprising a cover plate, a touch functional layer, and a flexible circuit board, characterized in that, The touch function layer is attached to the back of the cover plate and is electrically connected to the flexible circuit board. A piezoelectric transducer is attached to the back of the cover plate. The piezoelectric transducer is arranged around the touch function layer and is electrically connected to the flexible circuit board. The piezoelectric transducer realizes the mutual conversion of electrical energy and mechanical energy of the piezoelectric transducer according to the forward and reverse piezoelectric effects.

2. A touchscreen integrating a piezoelectric transducer according to claim 1, characterized in that, The cover plate is circular.

3. A touchscreen integrating a piezoelectric transducer according to claim 1, characterized in that, The cover plate includes a visible area and a non-visual area, the touch function layer is located in the visible area, and the piezoelectric transducer is located in either the visible area or the non-visual area.

4. A touchscreen integrating a piezoelectric transducer according to claim 3, characterized in that, The piezoelectric transducer has a ring-shaped encapsulation structure and is transparent. The piezoelectric transducer is bonded and fixed to the cover plate by an adhesive layer.

5. A touchscreen integrating a piezoelectric transducer according to claim 4, characterized in that, The adhesive layer is an OCA optical adhesive layer, and the thickness of the adhesive layer is 0.15 mm.

6. A touchscreen integrating a piezoelectric transducer according to claim 1, characterized in that, The touch function layer is a resistive touch layer, which includes a first film ITO sensor layer and a second film ITO sensor layer. The second film ITO sensor layer is bonded to the first film ITO sensor layer through a second adhesive layer, and the first film ITO sensor layer is bonded to the back of the cover plate through a first adhesive layer.

7. A touchscreen integrating a piezoelectric transducer according to claim 6, characterized in that, Both the first adhesive layer and the second adhesive layer are transparent OCA layers. The thickness of the first adhesive layer is 0.125 mm, and the thickness of the second adhesive layer is 0.05 mm.

8. A touchscreen integrating a piezoelectric transducer according to claim 1, characterized in that, The cover plate has an annular ink layer around its perimeter, and scale lines are provided along the annular ink layer.

9. A touchscreen integrating a piezoelectric transducer according to claim 1, characterized in that, The flexible circuit board is equipped with ZIF connectors and electronic components, and the flexible circuit board is provided with gold finger insertion terminals.

10. An electronic device, characterized in that, The touchscreen includes the integrated piezoelectric transducer as described in any one of claims 1-9.

Images