WO2021250634A1

WO2021250634A1 - Damping adhesive film for screen sounding technology and electronic device comprising same

Info

Publication number: WO2021250634A1
Application number: PCT/IB2021/055175
Authority: WO
Inventors: Xue Wen YAN; Chao Yang; Zhiyong Xu; Xin Xin SUN; Wei Jun Zhang
Original assignee: 3M Innovative Properties Company
Priority date: 2020-06-12
Filing date: 2021-06-11
Publication date: 2021-12-16
Also published as: TW202220458A; CN113810831A

Abstract

Disclosed is a damping adhesive film for screen sounding technology, the damping adhesive film comprising: a first pressure-sensitive adhesive layer; a second pressure- sensitive adhesive layer; and a damping layer disposed between the first and second pressure-sensitive adhesive layers. The first and second pressure-sensitive adhesive layers each independently comprise an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or any combination thereof. The damping layer comprises an α-olefin polymer or a blend thereof, wherein the glass transition temperature of the α-olefin polymer or the blend thereof is from −30°C to 50°C, the thickness of the damping layer is from 10 µm to 500 µm, and the storage modulus of the damping layer under the condition of 25°C is from 1 × 10⁵ Pa to 1 × 10⁷ Pa. Further disclosed is an electronic device comprising such a damping adhesive film, especially an electronic device adopting screen sounding technology. The damping adhesive film provided by the present invention has a specific structure and composition, and is capable of generating high damping for a specific frequency, and maintaining the loudness of screen sounding while smoothening a frequency response curve.

Description

DAMPING ADHESIVE FILM FOR SCREEN SOUNDING TECHNOLOGY AND ELECTRONIC DEVICE COMPRISING SAME

Technical Field

The present invention relates to a damping adhesive film for screen sounding technology and an electronic device comprising the same.

Background Screen sounding technology refers to technology that uses an exciter to generate a vibration source, which in turn drives a screen to vibrate and pushes the air to produce a sound. Different from conventional speakers that rely on vibration of a diaphragm to produce a sound, the technology can use the entire screen as a vibration source and receives extensive attention in application to electronic devices such as mobile phones (especially full-screen mobile phones), tablet computers, laptop computers, liquid crystal display televisions, headphones, game sound devices, etc. Additionally, by using acoustic surface technology, a mobile phone can be designed with a 100% display area, so that the mobile phone does not require drill holes or slots. The entire screen becomes a vibrating surface, which can generate a sufficiently loud sound to make a call, and can significantly improve the waterproof properties of the mobile phone. Full-screen mobile phones use an exciter to directly vibrate a screen module to produce a sound, or they can excite a middle frame and then transmit the vibration to the screen to produce a sound.

At present, devices for screen sounding excitation sources mainly comprise linear vibration motors, piezoelectric ceramic sheets, magnetic suspension vibration systems, etc. However, all these types of excitation source systems are bonded under the screen by a fastener structure or a glue. Relevant resonance frequency points are present on their vibration transmission paths, and both their resonance and frequency multiplication will absorb the vibration generated by the exciter, consequently causing sound distortion, affecting the screen sounding quality. WO 2015122495 discloses a novel ethylene/ -olefm/non-conjugated polyene copolymer, which comprises structural units derived from ethylene (A), a b-olefm (B) having 3 to 20 carbon atoms, and a non-conjugated polyene (C). The application only mentions acoustic applications, and does not involve a damping material for screen sounding technology.

JPH 07224190 relates to a vibration damping resin composition with excellent vibration damping properties in a wide temperature range. The vibration damping resin composition has excellent moldability to facilitate the production of composite materials, and has excellent adhesiveness by compounding a vibration damping rubber with three specific kinds of polymers. The vibration damping resin composition is prepared by compounding (A) a vibration damping rubber (preferably butyl rubber, polyisobutylene, etc.), (B) an olefin-acrylate copolymer (preferably the content of (meth)acrylate is from 3% to 30%), (C) a low -crystalline polyolefin copolymer resin (preferably crystallinity measured by wide-angle X-ray diffraction is <=20%), and (D) a copolymer of an olefin and an epoxy resin-containing acrylate (preferably the content of the epoxy resin- containing acrylate is from l%to 25%).

WO 2017189389 discloses an adhesive and a damping film. The adhesive comprises 20% to 50% by weight of a polyester, 30% to 60% by weight of a first tackifier, and 5% to 30% by weight of a first olefin-styrene block copolymer. The glass transition temperature of the polyester is from -40°C to -10°C, and the thermal activation temperature of the adhesive is from 20°C to 100°C. The damping film comprises at least one adhesive layer and comprises a foamed layer, the foamed layer contains 30% to 80% by weight of a second olefin-styrene block copolymer and 15% to 60% by weight of a second tackifier, and the foamed adhesive tape is used as a damping layer.

Summary

One objective of the present invention is to provide a novel damping adhesive film (sometimes called a damping sheet) for screen sounding technology to solve or control the problems existing in screen sounding technology (especially full-screen sounding technology). Another objective of the present invention is to provide an electronic device comprising the damping adhesive film, especially a full-screen mobile phone comprising the damping adhesive film.

To this end, in one aspect, the present invention provides a damping adhesive film for screen sounding technology, the damping adhesive film comprising: a first pressure- sensitive adhesive layer; a second pressure-sensitive adhesive layer; and a damping layer disposed between the first pressure-sensitive adhesive layer and the second pressure- sensitive adhesive layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently comprise an acrylic pressure- sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or any combination thereof; the damping layer comprises an a-olefin polymer or a blend of a plurality of a-olefin polymers, wherein the glass transition temperature of the a-olefin polymer or a blend thereof is from -30°C to 50°C, the thickness of the damping layer is from 10 pm to 500 pm, and the storage modulus of the damping layer under the condition of25°C is from 1 ^c 10⁵ Pa to 1 * 10⁷ Pa.

According to some preferred embodiments of the present invention, the thickness of the damping layer is from 10 pm to 200 pm, more preferably from 30 pm to 200 pm, and particularly preferably from 30 pm to 150 pm.

According to some preferred embodiments of the present invention, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently have a thickness from 2 pm to 30 pm, more preferably from 5 pm to 10 pm.

According to some preferred embodiments of the present invention, the peel strength between either of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer and the damping layer is not less than 0.3 N/mm.

According to some preferred embodiments of the present invention, the holding time of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer under the condition of 70°C in a static shear test in which a 100-g weight is suspended is greater than or equal to 1,000 min.

According to some preferred embodiments of the present invention, the first pressure-sensitive adhesive layer and the second pressure-sensitive layer each independently have a thickness from 5 pm to 10 pm.

According to some preferred embodiments of the present invention, the total thickness of the damping adhesive film is not more than 200 pm.

According to some preferred embodiments of the present invention, the a-olefin polymer is a polymer of a-olefins having 2 to 20 carbon atoms, more preferably a polymer of a-olefins having 2 to 10 carbon atoms. According to some preferred embodiments of the present invention, the glass transition temperature of the a-olefm polymer or the blend thereof is from -10°C to 50°C, more preferably from 10°C to 30°C.

In another aspect, the present invention provides an electronic device, the electronic device comprising the damping adhesive film provided by the present invention.

According to some preferred embodiments of the present invention, the electronic device is an electronic device adopting screen sounding technology, and the damping adhesive film is used to improve the frequency response curve of the electronic device.

According to some preferred embodiments of the present invention, the electronic device is a mobile phone, a tablet computer, a laptop computer, or a liquid crystal display television, and more preferably, the electronic device is a full-screen mobile phone.

According to some preferred embodiments of the present invention, the damping adhesive film is disposed on a transmission path between a sounding screen module and a screen sounding exciter of the electronic device.

By providing the novel damping adhesive film having a specific structure and composition and a significantly smaller thickness, the present invention can generate high damping for a specific frequency, and maintain the loudness of screen sounding while smoothening a frequency response curve.

In the electronic device utilizing the damping adhesive film of the present invention, through the vibration of an exciter, an emission screen is pushed, thereby pushing the air to vibrate to produce a sound, so that a large-size display screen can push more air with a relatively small movement, and enable a receiver to produce a sound of the same volume. Compared with conventional speakers, the low frequency response is basically the same, there is no obvious peak distortion, and the volume is basically the same as that of conventional headphones. In other words, with the damping adhesive film of the present invention, a damping effect is achieved by smoothening rather than elimination, and therefore, there is no problem of energy dissipation of conventional damping materials.

Additionally, the total thickness of the damping adhesive film of the present invention may not exceed 200 pm, so that it can be assembled into an electronic device (for example, a full-screen mobile phone) without changing the overall size of the electronic device, so as to smoothen the frequency response curve of the electronic device. Brief Description of the Drawings

FIG. 1 shows a schematic structural diagram of a damping adhesive fdm according to the present invention;

FIG. 2 shows a schematic diagram of a structure for testing a holding time according to the present invention;

FIG. 3 shows a method for testing a frequency response curve (SPL) according to the present invention;

FIG. 4 shows a schematic structural diagram of a damping adhesive fdm according to Example 1 of the present invention;

FIG. 5 shows a schematic constructional diagram of the damping adhesive fdm according to Example 1 of the present invention applied to a mobile phone;

FIG. 6 shows a frequency response curve graph obtained according to Example 1 of the present invention;

FIG. 7 shows a schematic structural diagram of a damping adhesive fdm according to Example 2 of the present invention;

FIG. 8 shows a schematic constructional diagram of the damping adhesive fdm according to Example 2 of the present invention applied to a mobile phone; and

FIG. 9 shows a frequency response curve graph obtained according to Example 2 of the present invention.

Detailed Description

The present invention is intended to use a damping material to smoothen the frequency response curve of an electronic device (for example, a light and thin full-screen mobile phone) for screen sounding technology. To this end, the inventor of the present invention found that a damping adhesive fdm having a specific structure and composition not only has a thickness suitable for electronic devices (for example, a light and thin full screen mobile phone), but also can smoothen rather than eliminate a frequency response curve, thus avoiding the problem of energy dissipation of conventional damping materials. Compared with conventional speakers, the low-frequency response of an electronic device having the damping adhesive fdm provided by the present invention is basically unaffected, no obvious peak distortion exists, and the volume is basically the same as that of conventional headphones. On this basis, a damping adhesive fdm for screen sounding technology provided by the present invention comprises: a first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer, and a damping layer disposed between the first pressure- sensitive adhesive layer and the second pressure-sensitive adhesive layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently comprise an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or any combination thereof; the damping layer comprises an a-olefin polymer or a blend of a plurality of a-olefin polymers, and the glass transition temperature of the a-olefin polymer or a blend thereof is from -30°C to 50°C; the thickness of the damping layer is from 10 pm to 500 pm, and the storage modulus of the damping layer under the condition of 25 °C is from 1 ^c 10⁵ Pa to 1 * 10⁷ Pa.

In the present invention, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer as the damping adhesive film refer to an adhesive layer formed using a pressure-sensitive adhesive. In the present invention, the first pressure- sensitive adhesive layer and the second pressure-sensitive adhesive layer may be the same or different, and they are each independently selected from an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive, or any combination thereof. Such pressure-sensitive adhesives are known to those skilled in the art, and corresponding pressure-sensitive adhesives required can be selected as needed. Such pressure-sensitive adhesives are also commercially available. For example, the acrylic pressure-sensitive adhesive can be ETERAC 7017 available from Eternal Chemicals, the organosilicone-based pressure- sensitive adhesive can be PSA518 available from Momentive Inc., U.S., and the rubber- based pressure-sensitive adhesive can be Kraton A1536 available from Kraton Corporation, U.S.

In the present invention, preferably, the holding time of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at 70°C in a static shear test in which a 100-g weight is suspended is greater than or equal to 1,000 min.

In the present invention, the a-olefin polymer comprised in the damping layer refers to a polymer of a-olefins having 2 to 20 carbon atoms, and more preferably a polymer of a-olefins having 2 to 10 carbon atoms. The a-olefin polymer or the blend thereof has a glass transition temperature (Tg) value from -30°C to 50°C, preferably from -10°C to 50°C, and more preferably from 10°C to 30°C. The inventor of the present invention found that the damping layer of the damping adhesive film formed by the a- olefin polymer or the blend thereof can effectively eliminate resonance points on a transmission path, and play a role in optimizing a screen sounding frequency response curve and improving sound quality.

In the present invention, the a-olefm polymer may comprise but is not limited to polyethylene, polypropylene, poly 1-butene, poly 1-pentene, poly 1-hexene, poly 4- methyl-l-pentene, poly 1-heptene, poly 1-octene, poly 1-decene, poly 1-tetradecene, etc. For example, the a-olefm polymer may be selected from EP1013 commercially available from Mitsui Chemicals, or VESTOPLAST 828, an amorphous polyolefin commercially available from Evonik Corporation.

According to some specific embodiments of the present invention, one or a plurality of kinds of a-olefm polymer powders or particles may be uniformly kneaded in a kneader, or a suitable solvent may be used to evenly dissolve one or a plurality of kinds of a-olefm polymer granules, and then coating or film-forming treatment is conducted on a substrate, so as to obtain the damping layer required by the present invention.

According to some specific embodiments of the present invention, the damping layer has a storage modulus from 1 ^c 10⁵ Pa to 1 ^c 10⁷ Pa under the condition of 25 °C.

The damping layer and the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer of the present invention can form the damping adhesive film of the present invention by a method known in the art. For example, the first pressure- sensitive adhesive layer and the second pressure-sensitive adhesive layer can be distributed and attached to upper and lower surfaces of the damping layer to make them adhere together (according to needs, for example, an appropriate pressure can be applied by a press roller), so as to obtain the required damping adhesive film.

The damping characteristics of the damping material can be measured, for example, by dynamic thermomechanical analysis (DMA). A higher loss factor of the damping material indicates better damping characteristics thereof. Generally, the damping characteristics of the damping material can be measured at a specific frequency (e.g., 1 Hz, 20 Hz, 200 Hz, etc.) by DMA. The damping adhesive fdm provided by the present invention can reduce the resonant vibration of an electronic device screen and smoothen its frequency response curve (SPL). In addition to acoustic properties, the damping adhesive fdm of the present invention has very good damping for medium-high frequencies, and it can smoothen the SPL curve instead of low frequency damping, and therefore it can enhance a low frequency volume.

Without wishing to be bound by a particular theory, the inventor of the present invention found that one or a plurality of an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive can absorb low frequency energy and smoothen a high frequency SPL curve upon combination with the damping layer of the present invention.

In the present invention, in order not to significantly increase the thickness or size of an electronic device, especially in order to adapt to a light and thin full-screen mobile phone, the total thickness of the damping adhesive film is preferably not more than 200 pm.

In the present invention, preferably, the thickness of the damping layer of the damping adhesive film of the present invention is from 10 pm to 200 pm, more preferably from 30 pm to 200 pm, further preferably from 30 pm to 150 pm. The inventor of the present invention found that using a damping layer having such a thickness can better ensure that the overall thickness of the resulting damping adhesive film does not exceed 200 pm, thereby ensuring that the damping adhesive film of the present invention can be suitably applied to a light and thin full-screen mobile phone.

In the present invention, preferably, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer of the damping adhesive film of the present invention may each have a thickness from 2 pm to 30 pm, and more preferably have a thickness from 5 pm to 10 pm. The inventor of the present invention found that within such a thickness range, the obtained damping adhesive film not only does not significantly increase the thickness or size of an electronic device to which it is applied, but can also maintain the adhesiveness of the damping adhesive film to a sounding screen module or an exciter. Preferably, the 180° peel strength between the damping adhesive film and the sounding screen module or the exciter is not less than 0.3 N/mm. Additionally, using a pressure-sensitive adhesive layer having such a thickness can better ensure that the overall thickness of the resulting damping adhesive fdm does not exceed 200 pm, thereby ensuring that the damping adhesive fdm of the present invention can be suitably applied to a light and thin full-screen mobile phone.

FIG. 1 shows a schematic structural diagram of a damping adhesive fdm according to the present invention. As shown in FIG. 1, the damping adhesive fdm comprises: a first pressure-sensitive adhesive layer 101, a second pressure-sensitive adhesive layer 103, and a damping layer 102 disposed between the first pressure-sensitive adhesive layer 101 and the second pressure-sensitive adhesive layer 103.

In the embodiment shown in FIG. 1, the pressure-sensitive adhesive layer 101 and the pressure-sensitive adhesive layer 103 may each independently comprise one or a plurality of an acrylic pressure-sensitive adhesive, an organosilicone -based pressure- sensitive adhesive, or a rubber-based pressure-sensitive adhesive. The pressure-sensitive adhesive layer 101 and the pressure-sensitive adhesive layer 103 may comprise the same pressure-sensitive adhesive, or may comprise different pressure-sensitive adhesives. The thicknesses of the pressure-sensitive adhesive layer 101 and the pressure-sensitive adhesive layer 103 may each be from 2 pm to 30 pm. and the thicknesses are preferably from 5 pm to 10 pm. More preferably, the pressure-sensitive adhesive layers of the pressure-sensitive adhesive layer 101 and the pressure-sensitive adhesive layer 103 meet one, a plurality, or all of the following requirements: 1) the 180° peel strength with a standard steel plate is not less than 0.3 N/mm; 2) the interlayer peel strength with the damping layer 102 is not less than 0.3 N/mm; and 3) the holding time under the condition of 70°C with a 100-g weight suspended is greater than or equal to 1,000 min.

In the embodiment shown in FIG. 1, the damping layer 102 comprises an a-olefm polymer material or a blend of a plurality of a-olefm polymer materials. The Tg value of the a-olefm polymer material or a blend thereof is from -30°C to 50°C, preferably from 10°C to 30°C. Under the condition of 25°C, the storage modulus of the damping layer 102 measured by dynamic mechanical analysis (DMA) is from 1 ^c 10⁵ Pa to 1 ^c 10⁷ Pa. The thickness of the damping layer 102 is from 10 pm to 200 pm, and the preferred thickness is from 30 pm to 200 pm.

The damping adhesive fdm provided by the present invention can be applied to electronic devices adopting screen sounding technology. The damping adhesive fdm can improve the frequency response curve of these electronic devices. These electronic devices may comprise but are not limited to mobile phones, tablet computers, laptop computers, liquid crystal display televisions, and other devices. In the following, a mobile phone is mainly used as an example of application of the damping adhesive film of the present invention, but those skilled in the art can understand that such an illustration is not intended to limit the scope of the present invention.

The damping adhesive film provided by the present invention can be disposed between a sounding screen module and a screen sounding exciter of the mobile phone, where the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer of the damping adhesive film are respectively adhered to the sounding screen module or the screen sounding exciter.

According to some preferred embodiments of the present invention, the damping adhesive film provided by the present invention has a good damping effect in the frequency range from 10 Hz to 10,000 Hz, especially in the frequency range from 1,000 Hz to 5,000 Hz.

Examples

The present invention will be further described below in detail with reference to examples. It should be understood that the present invention is not limited to the following examples. Unless otherwise specified, “parts” refers to “parts by weight,” “%” refers to “wt%,” and “g” refers to weight unit “gram.”

Table 1.1 List of Raw Materials

Testing method

180° Peel Strength Test

In the present invention, the 180° peel strength of a pressure-sensitive adhesive layer in a damping adhesive fdm provided by the present invention with a steel plate can be tested with reference to the peel strength test method ASTM D3330. Specific steps are as follows:

A stainless steel plate was wiped with isopropanol three times before the test. A 3M 9988 adhesive tape was used to attach the damping adhesive film to the standard steel plate, and the damping adhesive film was rolled twice with a force of 2 kg. A pressure- sensitive adhesive film to be tested was cut to be 1-inch wide, one side of the pressure- sensitive adhesive film was attached to 1-inch 50-pm PET, and the other side was attached to the damping adhesive film, and the pressure-sensitive adhesive film was rolled twice with a force of 2 kg.

Before the peel test, the damping adhesive film was placed in a controlled environment room (23°C/50% relative humidity) for 30 minutes, and then the test was performed using a tension tester Instron 3343 100N from Instron Corporation (Norwood, Massachusetts, US) at a speed of 12 inch/min according to test standard ASTM D3330. Each test was repeated twice to get the average value in N/mm.

Holding Time Test

Similar to the preparation of the 1.0 ^c 1.0-inches damping adhesive film sample (i.e., steel sheet / 3M 9988 pressure-sensitive adhesive tape / damping adhesive film / pressure-sensitive adhesive to be tested / damping adhesive film / 3M 9988 pressure- sensitive adhesive tape / steel sheet) in the 180° peel strength test above, as shown in FIG. 2, a static test was conducted, and the damping adhesive film sample was attached between two standard stainless steel sheets and placed horizontally; then, a 100-g weight was suspended under the stainless steel sheets, and they were placed in an oven at 70°C for observation. The retention time without peeling was tested.

Glass Transition Temperature (Tg) Determination

A test was conducted using an Ares G2 rotary rheometer from TA Company, U.S., at a fixed frequency of 1 Hz, in a temperature scanning mode, with strain being set to automatic, and using an 8-mm parallel plate fixture. The glass transition temperature Tg can be measured.

Dynamic Mechanical Test Of Storage Modulus A test was conducted using again an Ares G2 rotary rheometer from TA Company,

U.S., at a fixed frequency of 1 Hz, in a temperature scanning mode, with strain being set to automatic, and using an 8-mm parallel plate fixture. The G' storage modulus curve can be measured. Frequency Response (SPL) Test Method

The test environment was a semi-anechoic room, and its parameters are shown in Table 1.2. The test equipment is FX100 audio analysis recorder (commercially available from NTi Audio Inc., Schaan, Liechtenstein), and its parameters are shown in Table 1.3. Table 1.2

Table 1.3

Test method description: FIG. 3 shows a flowchart of a frequency response curve (SPL) test method according to the present invention. As shown in FIG. 3, the test system mainly comprises an audio test and analysis system (FX100 analysis recorder), a test device (mobile phone), a microphone for sound signal acquisition, a baffle or barrier (600 mm x 600 mm ^c 1 mm), and a necessary test bracket and fixture, etc. The mobile phone was fixed on the baffle or barrier, the baffle or barrier was fixed on the test bracket, and the test bracket was placed in the semi-anechoic room. When the test started, the audio test and analysis system needed to be turned on to input a pink noise sweep frequency electrical signal to the mobile phone to be tested. The mobile phone under test issued an audio signal according to the received pink noise sweep frequency electrical signal. The microphone was used to acquire an audio signal issued by the mobile phone under test, and the audio signal was returned to the audio test and analysis system. The audio test and analysis system was used to perform a sound pressure level analysis on the returned audio signal. The “sound pressure level analysis” was performed to analyze the energy distribution of these audio signals in a given range of frequencies (e.g., 200 to 10000 Hz) in the unit of sound pressure level of decibel, and evaluate the quality of sound represented by the audio signal issued by the mobile phone according to the curve of energy distribution (i.e., the frequency response curve).

Example 1

The structure of a damping adhesive film provided in this embodiment, as shown in FIG. 4, comprises a first pressure-sensitive adhesive layer 201, a second pressure- sensitive adhesive layer 203, and a damping layer 202 disposed between the first pressure- sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203.

The first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 each comprise an organosilicone-based pressure-sensitive adhesive PSA518. The organosilicone-based pressure-sensitive adhesive PSA518 may be coated to two sides of the damping layer 202 by means of the slot die coating process known in the prior art so as to form the structure of the damping adhesive film. The thicknesses of the first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 are both 10 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with a steel plate are both 0.4 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with the damping layer 202 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 201 and the holding power of the second pressure-sensitive adhesive layer 203 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min.

The damping layer 202 comprises an a-polyolefin EP1001. The Tg of the a- polyolefin EP1001 is 30°C. The thickness of the damping layer 202 is 75 pm (correspondingly, the total thickness of the resulting damping adhesive film is 95 pm).

The storage modulus of the damping layer 202 under the condition of 25 °C is 1.4

Pa.

As shown in FIG. 5, the damping adhesive film provided by this embodiment was applied to a mobile phone model. The mobile phone model comprises a glass sheet 301 simulating a mobile phone screen, a damping adhesive film 302, and a piezoelectric exciter 303 serving as a generating excitation source. The size of the glass sheet 301 simulating the mobile phone screen is 80 mm ^c 130 mm ^c 200 mm. As shown in FIG. 3, the glass sheet 301 simulating the mobile phone screen was tested to obtain the frequency response curve of a test sample provided in this embodiment.

Meanwhile, a pressure-sensitive adhesive film (9448A) from 3M Company was applied to a mobile phone model. The mobile phone model comprises a glass sheet 301 simulating a mobile phone screen, a pressure-sensitive adhesive film (9448A) 302, and a piezoelectric exciter 303 serving as a generating excitation source. The size of the glass sheet 301 simulating the mobile phone screen is 80 mm ^c 130 mm ^c 200 mm. As shown in FIG. 3, the glass sheet 301 simulating the mobile phone screen was tested to obtain the frequency response curve of a control sample provided in this embodiment.

Table 2 lists the test results of the measured frequency response curves, in which Adb = dbiest sample - dbcontroi sample . Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive film provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

FIG. 6 shows a frequency response curve graph corresponding to the test results of the measured frequency response curves, in which the dotted line (exciter) represents the test result of the control sample (the structure of the control sample is the same as the test sample provided in Embodiment 1 except that the control sample does not have a damping adhesive film), and the solid line (the damping layer) represents the test result of the test sample (in the presence of the damping adhesive film provided by the present invention).

Table 2

It can be seen from Table 2 and FIG. 6 that the frequency response curve of the test sample having the damping adhesive fdm provided by the present invention is smoother, effectively eliminating the sharp frequency response curve peaks of the frequency response curve of the control sample near 700 Hz, 1,200 Hz, and 2,400 Hz, thus significantly improving the sound quality of screen sounding.

Example 2

The structure of a damping adhesive film provided in this embodiment, as shown in FIG. 7, comprises a first pressure-sensitive adhesive layer 401, a second pressure- sensitive adhesive layer 403, and a damping layer 402 disposed between the first pressure- sensitive adhesive layer 401 and the second pressure-sensitive adhesive layer 403. The first pressure-sensitive adhesive layer 401 and the second pressure-sensitive adhesive layer 403 each comprise a rubber-based pressure-sensitive adhesive Kraton A1536. The thicknesses of the first pressure-sensitive adhesive layer 401 and the second pressure-sensitive adhesive layer 403 are both 30 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 401 and the 180° peel strength of the second pressure- sensitive adhesive layer 403 with a steel plate are both 0.3 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 401 and the 180° peel strength of the second pressure-sensitive adhesive layer 403 with the damping layer 402 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 401 and the holding power of the second pressure-sensitive adhesive layer 403 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min.

The damping layer 402 comprises a blend of an a-poly olefin EP1013 (70 wt%) and an a-polyolefin VESTOPLAST 828 (30%). The Tg of this blend is 10°C. The thickness of the damping layer 402 is 140 pm (correspondingly, the total thickness of the resulting damping adhesive film is 200 pm). The storage modulus of the damping layer 402 under the condition of 25°C is 1.2 ^c 10⁶ Pa.

As shown in FIG. 8, the damping adhesive film provided by this embodiment was applied to a mobile phone model. The mobile phone model comprises a glass sheet 501 simulating a mobile phone screen, a stainless steel middle frame 502, a damping adhesive film 503, and a piezoelectric exciter 504 serving as a generating excitation source. The stainless steel middle frame 502 and the glass sheet 501 were fixed by Loctite 3542PUR glue. The size of the glass sheet 501 simulating the mobile phone screen is 80 mm ^c 130 mm x 200 mm. As shown in FIG. 3, the glass sheet 501 simulating the mobile phone screen was tested to obtain the frequency response curve of a test sample provided in this embodiment.

Meanwhile, a pressure-sensitive adhesive film (9448A) from 3M Company was applied to a mobile phone model. The mobile phone model comprises a glass sheet 501 simulating a mobile phone screen, a stainless steel middle frame 502, a pressure-sensitive adhesive film (9448A) 503, and a piezoelectric exciter 504 serving as a generating excitation source. The stainless steel middle frame 502 and the glass sheet 501 were fixed by Loctite 3542PURglue. The size of the glass sheet 501 simulating the mobile phone screen is 80 mm ^c 130 mm ^c 200 mm. As shown in FIG. 3, the glass sheet 501 simulating the mobile phone screen was tested to obtain the frequency response curve of a test sample provided in this embodiment.

Table 3 lists the test results of the measured frequency response curves, in which Adb = dbiest sample - dbcontroi sample · Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive fdm provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

FIG. 9 shows a frequency response curve graph corresponding to the test results of the measured frequency response curves, in which the dotted line (exciter) represents the test result of the control sample (the structure of the control sample is the same as the test sample provided in Embodiment 2 except that the control sample does not have a damping adhesive fdm), and the solid line (the damping layer) represents the test result of the test sample (in the presence of the damping adhesive fdm provided by the present invention). Table 3

It can be seen from Table 3 and FIG. 9 that the frequency response curve of the test sample having the damping adhesive fdm provided by the present invention is smoother, effectively eliminating the sharp frequency response curve peaks of the frequency response curve of the control sample near 450 Hz, 730 Hz, 1,300 Hz, 2,000 Hz, and 4,700 Hz, thus significantly improving the sound quality of screen sounding.

Example 3

The first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 each comprise an acrylic pressure-sensitive adhesive TERAC 7017.

The thickness of the first pressure-sensitive adhesive layer 201 is 20 pm, and the thickness of the second pressure-sensitive adhesive layer 203 is 30 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 with a steel plate is 0.5 N/mm, and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with a steel plate is 0.4 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with the damping layer 202 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 201 and the holding power of the second pressure-sensitive adhesive layer 203 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min.

The damping layer 202 comprises a blend of an a-poly olefin EP1001 (60 wt%) and an a-polyolefin VESTOPLAST 828 (40%). The Tg of this blend is -30°C. The thickness of the damping layer 202 is 100 pm (correspondingly, the total thickness of the resulting damping adhesive film is 150 pm). The storage modulus of the damping layer 202 under the condition of 25°C is 1.0 ^c 10⁶ Pa.

Meanwhile, a pressure-sensitive adhesive fdm (9448A) from 3M Company was applied to a mobile phone model. The mobile phone model comprises a glass sheet 301 simulating a mobile phone screen, a pressure-sensitive adhesive film (9448A) 302, and a piezoelectric exciter 303 serving as a generating excitation source. The size of the glass sheet 301 simulating the mobile phone screen is 80 mm ^c 130 mm ^c 200 mm. As shown in FIG. 3, the glass sheet 301 simulating the mobile phone screen was tested to obtain the frequency response curve of a control sample provided in this embodiment.

Table 4 lists the test results of the measured frequency response curves, in which Adb = dbiest sample - dbcontroi sample · Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive film provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

Table 4

It can be seen from Table 4 that the frequency response curve of the test sample having the damping adhesive film provided by the present invention is smoother, effectively eliminating the sharp frequency response curve peaks of the frequency response curve of the control sample near 500 Hz, 1,000 Hz, and 1,500 Hz, thus significantly improving the sound quality of screen sounding. Example 4 The structure of a damping adhesive fdm provided in this embodiment, as shown in FIG. 4, comprises a first pressure-sensitive adhesive layer 201, a second pressure- sensitive adhesive layer 203, and a damping layer 202 disposed between the first pressure- sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203.

The first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 each comprise an organosilicone-based pressure-sensitive adhesive PSA518. The thicknesses of the first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 are both 2 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure- sensitive adhesive layer 203 with a steel plate are both 0.3 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with the damping layer 202 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 201 and the holding power of the second pressure-sensitive adhesive layer 203 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min.

The damping layer 202 comprises a blend of an a-poly olefin EP1013 (90 wt%) and an a-polyolefin VESTOPLAST 828 (10%). The Tg of this blend is 50°C. The thickness of the damping layer 202 is 500 pm. The storage modulus of the damping layer 202 under the condition of 25°C is 1.0 ^c 10⁷ Pa.

Table 5 lists the test results of the measured frequency response curves, in which Adb = dbiest sample - dbcontroi sample · Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive fdm provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

Table 5

It can be seen from Table 5 that the frequency response curve of the test sample having the damping adhesive film provided by the present invention is smoother, effectively eliminating the sharp frequency response curve peaks of the frequency response curve of the control sample near 1,000 Hz, 2,000 Hz, and 5,000 Hz, thus significantly improving the sound quality of screen sounding.

Example 5 The structure of a damping adhesive fdm provided in this embodiment, as shown in FIG. 4, comprises a first pressure-sensitive adhesive layer 201, a second pressure- sensitive adhesive layer 203, and a damping layer 202 disposed between the first pressure- sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203.

The first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 each comprise an organosilicone-based pressure-sensitive adhesive PSA518. The thicknesses of the first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 are both 5 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure- sensitive adhesive layer 203 with a steel plate are both 0.3 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with the damping layer 202 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 201 and the holding power of the second pressure-sensitive adhesive layer 203 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min. The damping layer 202 comprises a blend of an a-poly olefin EP1013 (70 wt%) and an a-polyolefin VESTOPLAST 828 (30%). The Tg of this blend is 10°C. The thickness of the damping layer 202 is 140 pm (correspondingly, the total thickness of the resulting damping adhesive film is 150 pm). The storage modulus of the damping layer 202 under the condition of 25°C is 1.2 ^c 10⁵ Pa.

Meanwhile, a pressure-sensitive adhesive film (9448A) from 3M Company was applied to a mobile phone model. The mobile phone model comprises a glass sheet 301 simulating a mobile phone screen, a pressure-sensitive adhesive film (9448A) 302, and a piezoelectric exciter 303 serving as a generating excitation source. The size of the glass sheet 301 simulating the mobile phone screen is 80 mm ^c 130 mm ^c 200 mm. As shown in FIG. 3, the glass sheet 301 simulating the mobile phone screen was tested to obtain the frequency response curve of a control sample provided in this embodiment. Table 6 lists the test results of the measured frequency response curves, in which

Adb = dbiest sample - dbcontroi sample . Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive film provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

It can be seen from Table 6 that the frequency response curve of the test sample having the damping adhesive film provided by the present invention is smoother, effectively eliminating the sharp frequency response curve peaks of the frequency response curve of the control sample near 200 Hz, 500 Hz, and 1,000 Hz, thus significantly improving the sound quality of screen sounding.

Comparative Example 1

The structure and composition of the damping adhesive film provided in this comparative example are similar to those of the damping adhesive film provided in Example 4, except that the thicknesses of the first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 are 50 pm, and the thickness of the damping layer 202 is 600 pm, and therefore, the total thickness of the resulting damping adhesive film reaches 700 pm. Because such a damping adhesive film is overly thick, if it is applied to a mobile phone, the mobile phone may lack of sufficient accommodation space.

Comparative Example 2

The structure and composition of the damping adhesive film provided in this comparative example are similar to those of the damping adhesive film provided in Example 5.

The first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 each comprise an organosilicone-based pressure-sensitive adhesive PSA518. The thicknesses of the first pressure-sensitive adhesive layer 201 and the second pressure-sensitive adhesive layer 203 are both 10 pm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure- sensitive adhesive layer 203 with a steel plate are both 0.4 N/mm. The 180° peel strength of the first pressure-sensitive adhesive layer 201 and the 180° peel strength of the second pressure-sensitive adhesive layer 203 with the damping layer 202 are both 0.3 N/mm, and both the holding power of the first pressure-sensitive adhesive layer 201 and the holding power of the second pressure-sensitive adhesive layer 203 meet that the holding time at 70°C with a 100-g weight suspended is more than 1,000 min.

The damping layer 202 comprises a polyolefin 9506F-500 from TOPAS Corporation, Japan. The Tg of this polyolefin is 60°C. The thickness of the damping layer 202 is 100 pm (correspondingly, the total thickness of the resulting damping adhesive film is 120 pm). The storage modulus of the damping layer 202 under the condition of 25°C is 1.3 x 10⁹ Pa.

Let Adb = dbi_est sample - dbc_ontroi sample- Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive film provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

However, the test showed that the frequency response of the test sample provided in this comparative example was mainly concentrated in a low frequency range (<200 Hz), and frequencies of which the absolute value of Adb is greater than 10 could not be found in the range from 200 Hz to 5,000 Hz. That is, the damping adhesive film provided in this comparative example cannot play a good smoothening effect on the frequency response curve of the test sample in the range from 200 Hz to 5,000 Hz. Comparative Example 3

The structure and composition of the damping adhesive film provided in this comparative example are similar to those of the damping adhesive film provided in Comparative Example 2, but the damping layer 202 thereof comprises a non-crystalline polyolefin E1015 PL-1 obtained from Eastman Company. The Tg of the YY polyolefin is -40°C, and the storage modulus of the damping layer 202 under the condition of 25 °C is 5 x 10⁴ Pa.

Let Adb = dbiest sample - dbcontroi sample. Using Adb as reference values, if the absolute value of Adb corresponding to a certain frequency is greater than 10, it indicates that at this frequency, the damping adhesive film provided in this embodiment has a good smoothening effect on the frequency response curve of the test sample.

However, the test showed that the frequency response of the test sample provided in this comparative example was mainly concentrated in a high frequency range (>1 x 10⁶ Hz), and frequencies of which the absolute value of Adb is greater than 10 could not be found in the range from 200 Hz to 5,000 Hz. That is, the damping adhesive film provided in this comparative example cannot play a good smoothening effect on the frequency response curve of the test sample in the range from 200 Hz to 5,000 Hz.

According to the concept of the present invention, the inventor proposes at least the following technical solutions:

Solution 1. A damping adhesive film for screen sounding technology, the damping adhesive film comprising: a first pressure-sensitive adhesive layer; a second pressure-sensitive adhesive layer; and a damping layer disposed between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently comprise an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or any combination thereof; the damping layer comprises an a-olefin polymer or a blend of a plurality of a- olefin polymers, wherein the glass transition temperature of the a-olefin polymer or a blend thereof is from -30°C to 50°C, the thickness of the damping layer is from 10 pm to 500 pm, and the storage modulus of the damping layer under the condition of 25 °C is from 1 x 10⁵ Pa to 1 ^c 10⁷ Pa.

Solution 2. The damping adhesive film according to solution 1, wherein the thickness of the damping layer is from 30 pm to 150 pm.

Solution 3. The damping adhesive film according to solution 1 or 2, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently have a thickness from 2 pm to 30 pm.

Solution 4. The damping adhesive film according to solution 1 or 2, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently have a thickness from 5 pm to 10 pm.

Solution 5. The damping adhesive film according to any one of the preceding solutions, wherein the peel strength between either of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer and the damping layer is not less than 0.3 N/mm.

Solution 6. The damping adhesive film according to any one of the preceding solutions, wherein the holding time of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at 70°C in a static shear test in which a 100-g weight is suspended is greater than or equal to 1,000 min.

Solution 7. The damping adhesive film according to any one of the preceding solutions, wherein the total thickness of the damping adhesive film is not more than 200 pm.

Solution 8. The damping adhesive film according to any one of the preceding solutions, wherein the a-olefin polymer is a polymer of a-olefins having 2 to 20 carbon atoms.

Solution 9. The damping adhesive film according to any one of the preceding solutions, wherein the a-olefin polymer is a polymer of a-olefins having 2 to 10 carbon atoms.

Solution 10. The damping adhesive film according to any one of the preceding solutions, wherein the glass transition temperature of the a-olefin polymer or the blend thereof is from -10°C to 50°C. Solution 11. The damping adhesive fdm according to any one of the preceding solutions, wherein the glass transition temperature of the a-olefm polymer or the blend thereof is from 10°C to 30°C.

Solution 12. An electronic device, the electronic device comprising the damping adhesive fdm according to any one of solutions 1-11.

Solution 13. The electronic device according to solution 12, wherein the electronic device is an electronic device adopting screen sounding technology, and the damping adhesive fdm is used to improve the frequency response curve of the electronic device.

Solution 14. The electronic device according to solution 12, wherein the electronic device is a mobile phone, a tablet computer, a laptop computer, or a liquid crystal display television.

Solution 15. The electronic device according to solution 12, wherein the electronic device is a full-screen mobile phone.

Solution 16. The electronic device according to any one of solutions 12 to 15, wherein the damping adhesive fdm is disposed on a transmission path between a sounding screen module and a screen sounding exciter of the electronic device.

Though the above specific embodiments comprise a great many concrete details for the purpose of illustration through examples, it is to be understood by those of ordinary skill in the art that, many variations, modifications, replacements, and changes to these details shall all fall within the scope of the present invention as claimed in the claims. Therefore, the disclosure as described in the specific embodiments does not pose any limitation to the present invention as claimed in the claims. The proper scope of the present invention should be defined by the claims and proper legal equivalents thereof. All references referred to are incorporated herein by reference in their entireties.

Claims

What is claimed is:

1. A damping adhesive fdm for screen sounding technology, the damping adhesive fdm comprising: a first pressure-sensitive adhesive layer; a second pressure-sensitive adhesive layer; and a damping layer disposed between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently comprise an acrylic pressure-sensitive adhesive, an organosilicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or any combination thereof; the damping layer comprises an a-olefin polymer or a blend of a plurality of a- olefin polymers, wherein the glass transition temperature of the a-olefin polymer or a blend thereof is from -30°C to 50°C, the thickness of the damping layer is from 10 pm to 500 pm, and the storage modulus of the damping layer under the condition of 25 °C is from 1 x 10⁵ Pa to 1 ^c 10⁷ Pa.

2. The damping adhesive film according to claim 1, wherein the thickness of the damping layer is from 30 pm to 150 pm.

3. The damping adhesive film according to claim 1, wherein the first pressure- sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently have a thickness from 2 pm to 30 pm.

4. The damping adhesive film according to claim 1, wherein the first pressure- sensitive adhesive layer and the second pressure-sensitive adhesive layer each independently have a thickness from 5 pm to 10 pm.

5. The damping adhesive film according to claim 1, wherein the peel strength between either of the first pressure-sensitive adhesive layer and the second pressure- sensitive adhesive layer and the damping layer is not less than 0.3 N/mm.

6. The damping adhesive film according to claim 1, wherein the holding time of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at 70°C in a static shear test in which a 100-g weight is suspended is greater than or equal to 1,000 min.

7. The damping adhesive film according to claim 1, wherein the total thickness of the damping adhesive film is not more than 200 pm.

8. The damping adhesive film according to claim 1, wherein the a-olefin polymer is a polymer of a-olefins having 2 to 20 carbon atoms.

9. The damping adhesive film according to claim 1, wherein the a-olefin polymer is a polymer of a-olefins having 2 to 10 carbon atoms.

10. The damping adhesive film according to claim 1, wherein the glass transition temperature of the a-olefin polymer or the blend thereof is from -10°C to 50°C.

11. The damping adhesive film according to claim 1, wherein the glass transition temperature of the a-olefin polymer or the blend thereof is from 10°C to 30°C.

12. An electronic device, the electronic device comprising the damping adhesive film according to any one of claims 1-11.

13. The electronic device according to claim 12, wherein the electronic device is an electronic device adopting screen sounding technology, and the damping adhesive film is used to improve the frequency response curve of the electronic device.

14. The electronic device according to claim 12, wherein the electronic device is a mobile phone, a tablet computer, a laptop computer, or a liquid crystal display television.

15. The electronic device according to claim 12, wherein the electronic device is a full-screen mobile phone.

16. The electronic device according to claim 12, wherein the damping adhesive fdm is disposed on a transmission path between a sounding screen module and a screen sounding exciter of the electronic device.