CN115942219B - Foldable directional sounding device, display device and preparation process - Google Patents
Foldable directional sounding device, display device and preparation process Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a foldable directional sound generating device, a display device and a preparation process, wherein the directional sound generating device is foldable while directional sound generating is realized by making a vibrating layer and a back electrode plate to be foldable, and in addition, the foldable directional sound generating device is combined with the foldable display device, so that the display device can display and can be folded and simultaneously generate directional sound. In addition, the preparation yield of the directional sound production device is improved, the preparation process difficulty is reduced and the like through a plurality of different novel preparation processes, so that the directional sound production device is well combined with the display device.
Description
Technical Field
The invention relates to the technical field of screen directional sounding, in particular to a foldable directional sounding device, a display device and a preparation process.
Background
With the development of display technology, consumers are more inclined to favor a display device which can realize sound and picture integration and perfectly integrate a display picture and a playing sound, not only in the requirements of picture quality and definition, but also in the output effect of sound gradually.
The existing sound and picture unification of a display device is realized through a screen sounding technology, and the principle is that a vibrating original is utilized to push a screen to vibrate to make a sound. For example: the resonance type screen sounding scheme is that a device with vibration characteristics is attached to the lower part of a screen or the middle frame of the whole machine, and the device vibrates when in work, so that the screen is finally driven to vibrate and sound; also for example: the device mainly comprises two parts, one part is directly attached to a screen, the other part is fixed on a middle frame, and when the device works, the two parts can generate interactive attraction or repulsion force, so that the screen is pushed to vibrate and sound, and compared with a resonance type screen sound generation scheme, the conversion efficiency is improved.
When the display screen on the electronic equipment is a foldable display screen, the area for displaying on the electronic equipment can be greatly enlarged, so that a user has better visual experience. Nowadays, foldable display screens are increasingly applied to various types of terminal equipment, and have good application prospects.
That is, the current market demand for folding screens is becoming more and more clear. Therefore, how to make the directional ultrasound screen foldable is a problem that needs to be solved at present.
Disclosure of Invention
The invention aims to provide a foldable directional sounding device, a display device and a preparation process.
To achieve the above object, in one aspect, the present invention provides a foldable directional sound generating apparatus, including:
the vibration layer comprises a first substrate layer and a first conductive layer, the first conductive layer is arranged on one end face of the first substrate layer, and the vibration layer vibrates and sounds under the action of a loaded electric signal;
the front back electrode plate is attached to the frame of the vibration layer and comprises a second substrate layer and a second conductive layer, and the second conductive layer is arranged on the end face, far away from the vibration layer, of the second substrate layer;
the micropattern is arranged on the end surface of the second substrate layer close to the vibration layer, is positioned between the first conductive layer and the second substrate layer after the vibration layer is attached to the front back polar plate frame, and is used for providing an air gap required by vibration of the vibration layer;
the first substrate layer and the second substrate layer are both folded films.
In a preferred embodiment, the vibration layer further includes: the first edge wire and the first edge insulating layer are arranged on the edge, close to the end face of the front back polar plate, of the first conductive layer, and the first edge insulating layer is arranged on the first edge wire and covers the first edge wire;
the front back plate further includes: the second edge wire and the second edge insulating layer, the second edge wire set up in the border of the terminal surface that the second conducting layer kept away from the second stratum basale, the second edge insulating layer set up in on the second edge wire, cover the second edge wire.
In a preferred embodiment, the first and second substrate layers are each a foldable transparent polyimide layer.
On the other hand, the invention provides a foldable display device which comprises the directional sounding device and a display layer, wherein the directional sounding device is the foldable directional sounding device, and the directional sounding device is directly attached to the display layer or is integrated with the display layer.
In a preferred embodiment, the display layer includes a protective layer, a polarizer, a foldable array, and an under-screen support layer stacked in this order from top to bottom, and the protective layer is adhered to the second conductive layer of the front back plate.
In a preferred embodiment, the protective layer is a single layer protective layer or a multi-layer composite protective layer, the single layer protective layer is any one of UTG ultrathin glass, PET and CPI film, and the multi-layer composite protective layer is a combination of any two or three of UTG ultrathin glass, PET and CPI film.
In a preferred embodiment, the display device has a folded corner region, which is not provided with edge tracks.
In yet another aspect, the present invention provides a process for preparing a foldable directional sound emitting device, comprising:
s1, preparing a vibration layer, and binding a flexible circuit board on the vibration layer;
s2, preparing a front back electrode plate, making the micropattern on the surface of the front back electrode plate, and binding a flexible circuit board on the front back electrode plate;
and S3, adhering the frame of the vibration layer and the front back polar plate.
In a preferred embodiment, the step S1 includes:
s11, coating the stock solution of the first substrate layer on carrier glass, and curing the stock solution of the first substrate layer to form the first substrate layer;
s12, plating the first conductive layer on the cured first substrate layer;
s13, making a first edge wire on the edge of the first conductive layer, and making a first edge insulating layer covering the first edge wire on the first edge wire;
and S14, binding the flexible circuit board on the first substrate layer, and then stripping off the carrier glass to form the vibration layer.
In a preferred embodiment, the step S2 includes:
s211, coating the stock solution of the second substrate layer on carrier glass, and curing the stock solution of the second substrate layer to form the second substrate layer;
s212, plating the second conductive layer on the cured second substrate layer;
s213, making a second edge wiring on the edge of the second conductive layer, and making a second edge insulating layer covering the second edge wiring on the second edge conductive layer;
s214, attaching carrier glass on the end face, far away from the second substrate layer, of the second conductive layer, and then stripping the carrier glass on the second substrate layer;
and S215, making the micropattern on the end surface of the second substrate layer far away from the second conductive layer, binding a flexible circuit board on the second substrate layer, and stripping carrier glass on the second conductive layer to form the front back electrode plate.
In a preferred embodiment, the step S3 includes:
s31, bonding the first substrate layer of the vibration layer by using carrier glass;
s32, tensioning the front back plate by using tensioning equipment;
s33, attaching the vibration layer stuck with the carrier glass in the step 31 to the frame of the front back polar plate tensioned in the step 32;
and S34, after the whole directional sound generating device is subjected to UV illumination, the carrier glass is peeled off.
In still another aspect, the present invention also discloses a process for preparing a foldable display device, comprising:
a, preparing a foldable directional sound generating device, wherein the directional sound generating device is prepared by the preparation process of the foldable directional sound generating device according to the above claims;
and B, directly attaching the directional sound generating device to the display layer, or integrating the directional sound generating device and the display layer into a whole.
Compared with the prior art, the invention has the following beneficial effects:
1. the directional sound generating device is arranged to be foldable, can be combined with various interfaces, can be used in a plane, a curved surface and the like, and can be suitable for various application occasions.
2. The invention combines the directional sounding device with the foldable display layer, realizes that the display screen can be folded and can sound in a directional manner.
3. When the invention is used for preparing the vibrating layer and the front back polar plate, a new process is adopted, specifically, the CPI can be realized by carrier glass, the optical grade can be realized, and the prepared product has high yield and low cost.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a directional sound emitting device of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a directional sound emitting device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the overall structure of a display device according to an embodiment of the invention;
FIG. 4 is a schematic view showing a structure of a vibration layer attached with carrier glass according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a process for manufacturing the directional sound generating device of the present invention;
FIG. 6 is a schematic flow chart of a vibration layer preparation in an embodiment;
FIG. 7 is a schematic flow chart of a front-back plate preparation in an embodiment;
FIG. 8 is a flow chart of a back plate and vibration layer frame patch in an embodiment;
FIG. 9a is a schematic view illustrating an inward fold of a display device according to an embodiment;
fig. 9b is a schematic view illustrating an outward folding structure of the display device according to an embodiment.
The reference numerals are:
10. the directional sounding device comprises a directional sounding device body 20, a display device body 1, a vibrating layer 11, a first substrate layer 12, a first conductive layer 13, a first edge wire 14, a first edge insulating layer 2, a micropattern 3, a front back polar plate 31, a second substrate layer 32, a second conductive layer 33, a second edge wire 34, a second edge insulating layer 4, carrier glass 5, a display layer 51, a protective layer 52, a polaroid 53, a foldable array 54, an under-screen supporting layer 21 and a bending angle area.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
The invention discloses a foldable directional sound generating device, a display device and a preparation process, wherein the directional sound generating device is foldable through making a vibrating layer and a front back polar plate into a foldable state, so that the directional sound generating device can generate sound in a directional manner, and in addition, the foldable directional sound generating device is combined with the foldable display device, so that the display device can display and generate sound in a foldable manner and can generate sound in a directional manner. In addition, the preparation yield of the directional sound production device is improved, the preparation process difficulty is reduced and the like through a plurality of different novel preparation processes, so that the directional sound production device is well combined with the display device.
As shown in fig. 1, a foldable directional sound generating device 10 according to an embodiment of the present invention includes a vibration layer 1, a micropattern 2 and a front back plate 3, where the vibration layer 1 is attached to a frame of the front back plate 3, and the micropattern 2 is located between the vibration layer 1 and the front back plate 3 and is used for providing an air gap required for vibration of the vibration layer 1. The vibration layer 1, the micropattern 2 and the front back polar plate 3 are combined to form an electrostatic ultrasonic transducer. The electrostatic ultrasonic transducer sends out ultrasonic signals modulated by the audio signals, audible sound is demodulated by air, and directional sound production is realized. Preferably, both the vibration layer 1 and the front back plate 3 are foldable, thereby achieving the foldability of the entire directional sound emitting device.
Specifically, as shown in fig. 2 to 4, the vibration layer 1 is mainly used for vibrating and sounding in response to an application of an electrical signal, and includes a first substrate layer 11, a first conductive layer 12, a first edge trace 13, and a first edge insulation layer 14, wherein the first conductive layer 12 is disposed on one end surface of the first substrate layer 11 (specifically, a lower end surface of the first substrate layer 11). In practice, the first base layer 11 is preferably made of a material having a low linear expansion coefficient at a temperature in the range of-40 ° to 150 °, preferably 15×10 -6 The Young's modulus of the following materials with expansion coefficient (PPM/K) is preferably higher than that of the materials with expansion coefficient of 5GPA or more. The CPI material is preferably transparent polyimide, and the formed oriented product is high in reliability and good in restoring force. In this embodiment, the first substrate layer 11 is a transparent polyimide (CPI) layer, the thickness of which is preferably 20um to 25um, the first conductive layer 12 may be an Indium Tin Oxide (ITO) layer, the thickness of which may be about 500nm, the lower the sheet resistance, the better the sheet resistance, the lower the load power, preferably 10 ohms, the higher the transmittance, preferably 88% or more. In other embodiments, the first conductive layer 12 may also be a composite structure of an Indium Tin Oxide (ITO) layer + a silver layer + an Indium Tin Oxide (ITO) layer.
The first edge trace 13 is disposed on an edge of the first conductive layer 12 away from an end surface of the first substrate layer 11 (specifically, a lower end surface of the first conductive layer 12), and is disposed at least along an edge of at least one side of the first conductive layer 12 when the first edge trace 13 is implemented, and the material of the first edge trace 13 may be silver paste or copper paste. Of course, in other embodiments, traces may be provided on both the edge and in-plane of the first conductive layer 12, i.e., the entire-plane conductive traces may be provided.
The first edge insulating layer 14 is disposed on the first edge trace 13 and covers at least the first edge trace 13, and in practice, the first edge insulating layer 14 may be a OCA (Optically Clear Adhesive) optical adhesive layer. Of course, if the traces are disposed on the edge and in-plane of the first conductive layer 12, the insulating layers are disposed on the edge traces and in-plane traces, that is, the whole-plane insulating layers are disposed.
During preparation, the vibration layer 1 can be manufactured by adopting different manufacturing processes, specifically can be realized by two processes, in one embodiment a, the first substrate layer 11 is rolled and fed, then a layer of first conductive layer 12 is plated on the surface of the first substrate layer 11 (namely, the lower surface of the first substrate layer 11), then a first edge routing 13 is formed on the edge of the first conductive layer 12 (specifically, the rolled film is divided into a plurality of independent areas, the first edge routing 13 is arranged on the edge of the first conductive layer 12 in each area, and an invalid area larger than 5mm is reserved outside the first edge routing 13 in each area, so that later cutting is facilitated, the yield is improved), then a first edge insulating layer 14 is arranged on the first edge routing 13, then the first substrate layer 11 is cut into small pieces as required, each vibration layer 1 is formed, and then each vibration layer 1 is bound to a flexible circuit board (FPC, not shown).
In another embodiment B, as shown in connection with fig. 4 and 6, the process for preparing the vibration layer 1 includes: s11, coating a stock solution such as CPI (transparent polyimide film) on Carrier Glass (CG) 5, and solidifying the CPI stock solution to form a first substrate layer 11; s12, plating a first conductive layer 12 on the cured first substrate layer 11; s13, making a first edge wire 13 at the edge of the first conductive layer 12, and making a first edge insulating layer 14 covering the first edge wire 13 on the first edge wire 13; s14, binding a flexible circuit board (FPC) on the first base layer 11, and then peeling off the carrier glass 4 to form the vibration layer 1. Finally, the front and back sides of the vibrating layer 1 are covered with the protection films for shipment, and the protection films are torn off for use when in use. CPI stock solution is coated on carrier glass 4, CPI can be made optical grade. However, in the first example A, the number of times of adhesion of the carrier glass 4 was small, so that the production yield was higher than that in the example B.
The front back polar plate 3 is attached to the frame of the vibration layer 1 and is used for providing support for the vibration of the vibration layer 1. Specifically, in this embodiment, the front back electrode plate 3 includes a second substrate layer 31, a second conductive layer 32, a second edge trace 33 and a second edge insulating layer 34, where the second conductive layer 32 is disposed on an end surface of the second substrate layer 31 away from the vibration layer 1 (specifically, a lower end surface of the second substrate layer 31), and when implemented, the second substrate layer 31 may be a transparent polyimide (CPI) layer, the thickness of which is preferably 4um to 6um, and the second conductive layer 32 may be an Indium Tin Oxide (ITO) layer, the thickness of which may be about 500nm, the lower the sheet resistance, the better the sheet resistance, and the better the higher the transmittance, and preferably 88% or more.
The second edge trace 33 is disposed on an edge of the second conductive layer 32 away from an end surface of the second substrate layer 31 (specifically, a lower end surface of the second conductive layer 32), and when implemented, is disposed at least along an edge of at least one side of the second conductive layer 32, and the second edge trace 33 may be made of silver paste or copper paste. Of course, in other embodiments, traces may be provided on both edges and in-plane of the second conductive layer 32, i.e., full-plane conductive traces may be provided.
The second edge insulating layer 34 is disposed on the second edge trace 33 and covers at least the second edge trace 33, and in practice, the second edge insulating layer 34 may be a OCA (Optically Clear Adhesive) optical adhesive layer. Of course, if the traces are disposed on the edge and in-plane of the second conductive layer 32, the insulating layer is disposed on the edge trace and the in-plane trace, that is, the entire insulating layer is disposed.
In practice, the lower the line resistance of the edge wiring and the whole-surface conductive wiring is, the more favorable the load power reduction is. And the lower the heights of the edge wiring and the whole conductive wiring are, the smaller the edge section difference is, and the better the appearance is after the vibrating layer 1 is in frame adhesion with the front back polar plate 3. The smaller the optical visual difference is due to the level difference at the edge. The edge routing resistance is preferably lower than 3 ohms, copper metal routing is preferred, and the thickness of copper can be less than 1 um. The width of copper wiring in the plane can be 5-10 um, and the visual effect is good.
During the preparation, the same way as the vibration layer 1 is adopted, the front back electrode plate 3 can be specifically manufactured by adopting two different manufacturing processes, in one embodiment A1, the second substrate layer 31 is firstly rolled and fed, then a layer of second conductive layer 32 is plated on the surface of the second substrate layer 31, then a second edge routing 33 is made on the edge of the second conductive layer 32 (the same as the vibration layer, specifically, the rolled film is divided into a plurality of independent areas, the second edge routing 33 is arranged on the edge of the second conductive layer 32 in each area, an invalid area larger than 5mm is reserved outside the second edge routing 33 in each area, so that the later cutting is facilitated, the yield is improved), then a second edge insulating layer 34 is arranged on the second edge routing 33, then micropattern 2 is made on the end surface of the second substrate layer 31 far away from the second conductive layer 32, then the second substrate layer 31 is cut into small pieces as required, each front back electrode plate 3 is formed, and then each front back electrode plate 3 is bound to a flexible circuit board (FPC, not shown).
In another embodiment B, as shown in conjunction with fig. 7, the front back plate 3 is prepared by a process comprising: s211, coating a stock solution such as CPI (transparent polyimide film) on Carrier Glass (CG), and solidifying the CPI stock solution to form a second substrate layer 31; s212, plating a second conductive layer 32 on the cured second substrate layer 31; s213, making a second edge wire 33 at the edge of the second conductive layer 32, and making a second edge insulating layer 34 covering the second edge wire 33 on the second edge wire 33; s214, attaching carrier glass on the end surface of the second conductive layer 32 far from the second substrate layer 31 (namely the lower end surface of the second conductive layer 32), and stripping the carrier glass on the second substrate layer 31; s215, micropattern 2 is formed on the end surface of the second substrate layer 31 away from the second conductive layer 32 (i.e. the upper end surface of the second substrate layer 31), then the flexible circuit board is bound on the second substrate layer 31, and then the carrier glass on the second conductive layer 32 is peeled off to form the front and back electrode plate 3. And finally, coating shipment protection films on the front and back sides of the front back polar plate 3, and tearing off the protection films for use when in use.
The conductive layer plating can be carried out by adopting a magnetron sputtering mode of a carrier glass conductive layer plating, and different sizes are matched and erected to form inconsistent jigs. The edge wire can be copper edge wire or silver paste edge wire. In the case of copper, a thin copper is generally used, the entire surface is plated with copper, and unnecessary portions are etched by post exposure development. If silver paste is removed, silk screen printing or silk screen printing and laser mode can be used. The whole insulation can be made by adopting processes such as silk screen printing, vapor plating, magnetron sputtering, spin coating and the like. If the pattern is formed by one-step selective screen printing, 2-step selective exposure and development are carried out.
In one embodiment, the first substrate layer 11 with a thickness of 23 um-25 um is preferably used, the center distance between two adjacent micro patterns 2 is 1.1mm, the height of the micro patterns 2 is 15 um-17 um, the frequency of the directional sounding device can fall between 70 khz-85 khz, and the efficiency of the directional sounding device formed by the matching structure is better and the distortion is low. In another embodiment, if the first substrate layer 11 is made of CPI material with a thickness of 50um, the micro pattern 2 with a center distance of 1.35um to 1.5um can be matched, the micro pattern 2 has a height of 8um to 12um, the frequency of the directional sounding device can fall between 70khz to 85khz, and the efficiency of the directional sounding device formed by the matched structure is also better, and meanwhile, the distortion is low.
Referring to fig. 5, a process for manufacturing a foldable directional sound generating device according to an embodiment of the present invention includes:
s1, preparing a vibration layer 1, and binding a flexible circuit board on the vibration layer 1;
s2, preparing a front back electrode plate 3, making a micro pattern 2 on the surface of the front back electrode plate 3, and binding a flexible circuit board on the front back electrode plate 3.
The preparation of the vibration layer 1 and the specific preparation steps of the front back plate 3 may refer to the description in the directional sound generating device, and are not described herein.
And S3, attaching the vibration layer 1 to the whole back electrode plate in a frame mode.
Since the directional sound generating apparatus needs to maintain a constant tension in the vibration layer 1, if the vibration layer 1 and the front back plate 3 are all of the film type, the vibration layer 1 and the front back plate 3 need to be bonded with each other with a constant tension.
Referring to fig. 8, in one embodiment, the step S3 specifically includes: s31, bonding the first base layer 11 of the vibration layer 1 with carrier glass; s32, tensioning the front back polar plate by using tensioning equipment; s33, attaching the vibration layer 1 stuck with the carrier glass in the step 31 to the frame of the front back polar plate tensioned in the step 32; and S34, after the whole directional sound generating device 10 is subjected to UV illumination, the carrier glass is peeled off. In the implementation, the carrier glass is specifically bonded with the vibration layer 1 by using UV viscosity reducing adhesive, and if the carrier glass is not combined with the display layer 5 in use, the step S34 is directly executed in use; if the directional sound generating apparatus 10 is attached to the display layer 5, the step S34 is executed again after the directional sound generating apparatus 10 is attached to the display layer 5. This embodiment facilitates a reduction in the overall cycle time of the directional sound generating apparatus 10.
In another embodiment, if the front back electrode plate is attached to the display layer 5, the front back electrode plate can be directly attached to the display layer 5, then the vibration layer 1 is tensioned by adopting tensioning equipment, the vibration layer 1 is attached to the frame of the front back electrode plate attached to the display layer 5 after tensioning, and finally the tensioning of the tensioning equipment is cancelled, and the finally formed display device 20 is cut to obtain a final product.
The foldable display device 20 disclosed in the present invention includes the above-mentioned directional sounding device 10 and the display layer 5, wherein the specific structure and specific preparation process of the directional sounding device 10 can refer to the description of the above-mentioned directional sounding device, and the details are not repeated here. In this embodiment, the directional sounding apparatus 10 is directly adhered to the display layer 5, i.e. is externally hung on the display layer 5, and specifically, the directional sounding apparatus 10 can be fully adhered to the foregoing directional sounding apparatus 10 through an adhesive layer, and specifically, the end surface of the second conductive layer 32 of the front back electrode plate 3 far from the second substrate layer 31 (i.e. the lower end surface of the second conductive layer 32) is fully adhered to the adhesive layer. In this embodiment, the adhesive is specifically adhered by an OCA optical adhesive layer. In other alternative embodiments, the directional sound emitting device 10 may be integrally provided with the display layer 5, for example, the structure of the front backplate 3 may be formed directly on the display layer 5.
In practice, the display layer 5 may be implemented using existing folded display layers. In this embodiment, the display layer 5 specifically includes a protective layer 51, a polarizer 52 (Pol), a foldable array 53 and an under-screen support layer 54 stacked sequentially from top to bottom, where the protective layer 51 may be a single-layer protective layer or a multi-layer composite protective layer, and the single-layer protective layer may be any one of UTG ultrathin glass, PET and CPI films, and the multi-layer composite protective layer may be a combination of any two or three of UTG ultrathin glass, PET and CPI films. The protective layer 51 and the polarizer 52 are also specifically adhered by an OCA optical adhesive layer.
As shown in fig. 9a and 9b, the foldable display device 20 may be folded out or folded in. After bending, a bending angle area 21 formed by folding is formed, and the edge routing is not arranged in the bending angle area 21, namely, the edge routing avoids the bending angle area 21, and the edge routing is prevented from being damaged by multiple folds.
The invention has the advantages that 1, the directional sound generating device 10 is provided as a foldable shape, can be combined with various interfaces, such as a plane, a curved surface and the like, can be used, and can be suitable for various application occasions. 2. The invention combines the directional sounding device 10 with the foldable display layer 5, realizes the foldable display screen 6 and simultaneously can directionally sound. 3. When the vibrating layer 1 and the front back polar plate 3 are prepared, a new process is adopted, specifically, the CPI can be realized by carrier glass, the optical grade of the CPI can be realized, and the prepared product has high yield and low cost.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (11)
1. A collapsible directional sound emitting apparatus comprising:
the vibration layer comprises a first substrate layer and a first conductive layer, the first conductive layer is arranged on one end face of the first substrate layer, and the vibration layer vibrates and sounds under the action of a loaded electric signal; the first substrate layer adopts a linear expansion coefficient of 15 multiplied by 10 with the temperature ranging from minus 40 degrees to 150 degrees -6 The following materials with Young's modulus of more than 5GPA are adopted, and the preparation process of the vibration layer comprises the following steps: s11, coating the stock solution of the first substrate layer on carrier glass, and curing the stock solution of the first substrate layer to form the first substrate layer; s12, plating the first conductive layer on the cured first substrate layer;
the back of body polar plate, with the laminating mutually of vibration layer frame, the back of body polar plate includes second stratum basale and second conducting layer, the second conducting layer set up in on the terminal surface that the vibration layer was kept away from to the second stratum basale, the preparation process of back of body polar plate includes: s211, coating the stock solution of the second substrate layer on carrier glass, and curing the stock solution of the second substrate layer to form the second substrate layer; s212, plating the second conductive layer on the cured second substrate layer;
the micropattern is arranged on the end surface of the second substrate layer close to the vibration layer, is positioned between the first conductive layer and the second substrate layer after the vibration layer is attached to the front back polar plate frame, and is used for providing an air gap required by vibration of the vibration layer;
the first substrate layer and the second substrate layer are folding films, and the vibrating layer, the micropattern and the front back polar plate are combined to form an electrostatic ultrasonic transducer.
2. A collapsible directional sound generating apparatus according to claim 1,
the vibration layer further includes: the first edge wire and the first edge insulating layer are arranged on the edge, close to the end face of the front back polar plate, of the first conductive layer, and the first edge insulating layer is arranged on the first edge wire and covers the first edge wire;
the front back plate further includes: the second edge wire and the second edge insulating layer, the second edge wire set up in the border of the terminal surface that the second conducting layer kept away from the second stratum basale, the second edge insulating layer set up in on the second edge wire, cover the second edge wire.
3. A foldable display device, characterized in that the display device comprises a directional sound generating device and a display layer, the directional sound generating device is a foldable directional sound generating device according to claim 1 or 2, and the directional sound generating device is directly attached to the display layer, or the directional sound generating device and the display layer are integrated.
4. A foldable display device according to claim 3, wherein the display layer comprises a protective layer, a polarizer, a foldable array and an under-screen support layer stacked in this order from top to bottom, the protective layer being adhered to the second conductive layer of the front back plate.
5. The foldable display device of claim 4, wherein the protective layer is a single layer protective layer or a multi-layer composite protective layer, the single layer protective layer being any one of UTG ultra-thin glass, PET and CPI films, the multi-layer composite protective layer being a combination of any two or three of UTG ultra-thin glass, PET and CPI films.
6. A foldable display device as claimed in claim 3, characterized in that the display device has folded corner regions, which are not provided with edge tracks.
7. A process for manufacturing a foldable directional sound emitting device according to claim 1, comprising:
s1, preparing a vibration layer, and binding a flexible circuit board on the vibration layer;
s2, preparing a front back electrode plate, making the micropattern on the surface of the front back electrode plate, and binding a flexible circuit board on the front back electrode plate;
and S3, adhering the frame of the vibration layer and the front back polar plate.
8. The process for manufacturing a foldable directional sound generating apparatus according to claim 7, wherein S1 further comprises:
s13, making a first edge wire on the edge of the first conductive layer, and making a first edge insulating layer covering the first edge wire on the first edge wire;
and S14, binding the flexible circuit board on the first substrate layer, and then stripping off the carrier glass to form the vibration layer.
9. The process for manufacturing a foldable directional sound generating apparatus according to claim 7, wherein S2 further comprises:
s213, making a second edge wiring on the edge of the second conductive layer, and making a second edge insulating layer covering the second edge wiring on the second edge conductive layer;
s214, attaching carrier glass on the end face, far away from the second substrate layer, of the second conductive layer, and then stripping the carrier glass on the second substrate layer;
and S215, making the micropattern on the end surface of the second substrate layer far away from the second conductive layer, binding a flexible circuit board on the second substrate layer, and stripping carrier glass on the second conductive layer to form the front back electrode plate.
10. The process for manufacturing a foldable directional sound generating apparatus according to claim 7, wherein S3 comprises:
s31, bonding the first substrate layer of the vibration layer by using carrier glass;
s32, tensioning the front back plate by using tensioning equipment;
s33, attaching the vibration layer stuck with the carrier glass in the step 31 to the frame of the front back polar plate tensioned in the step 32;
and S34, after the whole directional sound generating device is subjected to UV illumination, the carrier glass is peeled off.
11. A process for preparing a foldable display device according to any one of the preceding claims 3 to 6, characterized in that the process comprises:
a, preparing a foldable directional sound generating device, wherein the directional sound generating device is prepared by the preparation process of the foldable directional sound generating device according to any one of claims 7-10;
and B, directly attaching the directional sound generating device to the display layer, or integrating the directional sound generating device and the display layer into a whole.
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