Touch Acoustic Display Unit and Device

Abstract

The present invention discloses a touch acoustic display unit and a device. The touch acoustic display unit includes a first substrate, a functional region, and a second substrate which are sequentially stacked from top to bottom. The functional region includes a touch region and an acoustic region. Both the touch region and the acoustic region are located between the first substrate and the second substrate and are provided at intervals in the horizontal direction. The first substrate and the second substrate are shared. The acoustic region is an electrostatic ultrasonic transducer. In the present invention, by combining the electrostatic ultrasonic transducer and the touch screen, the display device can direct sound towards the screen on one side and can be touched on the other side, without interference between the two sides, realizing screen-directed sound, listening in private to avoid interference with surrounding people, and also providing a touch function to expand its application range.

Description

Technical Field

[0001] The present invention relates to the technical field of screen-directed sound, and more particularly to a touch acoustic display unit and device.

Background Art

[0002] Due to the ultra-thin, narrow bezel and full-screen design of display devices, the space left for acoustic devices is becoming increasingly smaller. Conventional acoustic devices are large in volume and have limited mounting positions, making it difficult to have appropriate positions and spaces in next-generation display devices. Therefore, it is necessary to redesign an acoustic device that can adapt to the current needs of display devices.

[0003] Some display device manufacturers have designed a method of sounding sound through the screen. Screen acoustic technology, as surface audio technology, provides new solutions for the audio of multimedia audio-visual devices. Currently, a transparent screen-directed speaker combining a display device and a screen acoustic device has been developed, which uses the screen itself as a speaker by its vibration, saving the space of the resonator of a conventional speaker and meeting the requirement that the privacy requirements of personal electronic devices and public devices do not interfere with each other due to the directional propagation characteristics.

[0004] A touch panel can recognize touch points input by a human hand or an individual input unit and transmit corresponding information to the upper display device. Touch panels can be classified into resistive, capacitive, and infrared detection types based on their contact detection methods. Capacitive touch panels are currently widely noted because of their easy manufacturing method and strong sensitivity.

[0005] How to combine screen-directed sound and touch functions to integrate many functions such as screen-directed sound, display, and touch on a display, and whether the two functions interfere with each other is a problem that needs to be solved currently.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a touch acoustic display unit and device capable of simultaneously realizing a touch function and a screen-directed acoustic function.

Means for Solving the Problems

[0007] In order to achieve the above object, in one aspect, according to the present invention, there is provided a touch acoustic display unit including a first substrate, a functional region, and a second substrate which are sequentially stacked from top to bottom, wherein the functional region includes a touch region and an acoustic region, the touch region and the acoustic region are both located between the first substrate and the second substrate, and are provided at intervals in the horizontal direction, the first substrate and the second substrate are shared, and the acoustic region is an electrostatic ultrasonic transducer.

[0008] In one preferred embodiment, the electrostatic ultrasonic transducer includes a first electrode, a second electrode, and a microstructure. The first electrode is formed on the lower end surface of the portion of the first substrate facing the second substrate, the second electrode is formed on the upper end surface of the portion of the second substrate facing the first substrate, the microstructure is formed between the first electrode and the second electrode, supplies an air gap necessary for vibrating the acoustic layer to produce sound, and the outer edge of the acoustic region located between the first substrate and the second substrate is bonded to a frame.

[0009] In one preferred embodiment, the first electrode includes a first conductive layer and a first edge conductive layer, the second electrode includes a second conductive layer and a second edge conductive layer, the first conductive layer is formed on the lower end surface of the portion of the first substrate facing the second substrate, the first edge conductive layer is formed on the edge of the first conductive layer located on at least one side of the acoustic region, the second conductive layer is formed on the upper end surface of the portion of the second substrate facing the first substrate, and the second edge conductive layer is formed on the edge of the second conductive layer located on at least one side of the acoustic region.

[0010] In one preferred embodiment, the electrostatic ultrasonic transducer further includes an insulating layer, the insulating layer includes a first insulating layer and a first edge insulating layer, the first insulating layer is formed on the upper end surface of the portion of the second substrate facing the first substrate, and covers at least the second conductive layer and the second edge conductive layer, the microstructure is formed on the first insulating layer, the first edge insulating layer is formed on the lower end surface of the portion of the first substrate facing the second substrate, and covers at least the first edge conductive layer.

[0011] In one preferred embodiment, the touch area includes a third conductive layer and a fourth conductive layer, the third conductive layer is formed on the lower end surface of the portion of the first substrate facing the second substrate, and is provided at a distance from the first conductive layer, the fourth conductive layer is formed on the upper end surface of the portion of the second substrate facing the first substrate, and is provided at a distance from the first conductive layer.

[0012] In one preferred embodiment, the third conductive layer is flush with the lower end surface of the first conductive layer, and is separated from the first conductive layer so as to be insulated by a first spacing region, the fourth conductive layer is flush with the lower end surface of the second conductive layer, and is separated from the second conductive layer so as to be insulated by a second spacing region.

[0013] Preferably, the third conductive layer and the fourth conductive layer are adhered and bonded by an adhesive, and the thickness of the adhesive is the same as the distance between the first conductive layer and the second conductive layer.

[0014] Preferably, the third conductive layer has a sheet resistance higher than that of the first conductive layer, and the fourth conductive layer has a sheet resistance higher than that of the second conductive layer.

[0015] Preferably, the first conductive layer and the second conductive layer use a conductive material with a resistance of 10 ohms or less, and the third conductive layer and the fourth conductive layer use a conductive material with a resistance of 100 ohms to 150 ohms or less.

[0016] Preferably, both the first substrate and the second substrate are PET films. The first substrate has a thickness of 20 μm to 25 μm, and the second substrate has a thickness of 50 μm to 55 μm. The first spacing region and the second spacing region have a width of 20 μm or less, and the narrower the width, the higher the visualization effect.

[0017] In another aspect, according to the present invention, there is provided a touch acoustic display device including at least one of the above touch acoustic display units or a plurality of joined touch acoustic display units.

Advantages of the Invention

[0018] Compared with the prior art, the present invention has the following beneficial effects.

[0019] 1. In the present invention, by combining an electrostatic ultrasonic transducer and a touch screen, the display device can emit sound directed at the screen on one side and be touched on the other side, and the two sides do not interfere with each other, realizing screen-directed sound and enabling private listening while avoiding interference with surrounding people. At the same time, it has a touch function, expanding its application range and making it applicable to automobiles.

[0020] 2. In the present invention, by using two substrate layers and combining corresponding manufacturing processes and combinations of different material parameters, the audible sound pressure level of the formed display device at 1 kHz can reach 70 - 80 dB.

Brief Description of the Drawings

[0021]

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Mode for Carrying Out the Invention

[0022] Hereinafter, specific embodiments of the present invention will be described in detail, but it should be understood that the protection scope of the present invention is not limited to the specific embodiments.

[0023] Unless otherwise clearly indicated, throughout the specification and the claims, the term "comprising" or its variations, such as "including" or "included", should be understood to include the recited elements or components without excluding other elements or other components.

[0024] The touch acoustic display unit and device according to the present invention combine an electrostatic ultrasonic transducer and a touch screen, so that the display device can direct sound towards the screen on one side and touch on the other side, and the two sides do not interfere with each other, realizing screen-directed sound and enabling private listening while avoiding interference with surrounding people, and also having a touch function, expanding its application range, for example, it can be applied to automobiles.

[0025] As shown in FIG. 1, the touch acoustic display unit according to the embodiment of the present invention includes a first substrate 1, a functional region, and a second substrate 4 which are stacked in order from top to bottom. The functional region includes an acoustic region 2 and a touch region 3 which are provided at intervals. That is, the first substrate 1, the functional region, and the second substrate 4 are combined to form a touch unit on one side and an acoustic unit on the other side, enabling the display screen to perform touch display and direct sound, and realizing that the two sides do not interfere with each other.

[0026] Specifically, the first substrate 1 is located in the uppermost layer, and a PET material commonly used in the touch field may be selected and used, or CPI (transparent polyimide film) / PI (polyimide film) / UTG (Ultra-Thin Glass, extremely thin glass) may be selected. The smaller the thickness of the first substrate 1, the higher the acoustic efficiency. The preferred thickness may be 6 μm to 50 μm, and the commonly used thicknesses are 6 μm, 12 μm, 21 μm, 23 μm, 25 μm, or 50 μm. The second substrate 4 is located in the lowermost layer, and a PET material or glass commonly used in the touch field may be selected and used. The commonly used thickness is 50 μm.

[0027] As shown in FIGS. 2 and 3, the touch area 3 and the acoustic area 2 are located between the first substrate 1 and the second substrate 4, and are provided with a space therebetween left and right. The acoustic area 2 uses an electrostatic ultrasonic transducer. Specifically, it includes a first electrode 21, a second electrode 22, a microstructure 23, and an insulating layer 24. The first electrode 21 includes a first conductive layer 211 and a first edge conductive layer 212. The touch area 3 includes a third conductive layer 31 and a fourth conductive layer 32. The third conductive layer 31 and the first conductive layer 211 are both formed on the lower end surface of the first substrate 1 and are respectively located on the left and right sides of the lower end surface of the first substrate 1, and are separated by a first spacing area 5. During manufacturing, first, a conductive layer is plated on the left half of the lower end surface of the first substrate 1, then a conductive layer is plated on the right half of the lower end surface of the first substrate 1, and then the first spacing area 5 is etched or photo-etched in the middle area of the conductive layers on both sides. The first spacing area 5 is an area without a conductive layer. In this way, the left conductive layer forms the third conductive layer 31, and the right conductive layer forms the first conductive layer 211. Also, sheet plating may be used. Specifically, first, the area for plating the third conductive layer 31 on the lower end surface of the first substrate 1 is laminated (of course, the area for plating the first conductive layer 211 may also be laminated, and the order is not limited), then a conductive layer is plated on the area for plating the first conductive layer 211 to form the first conductive layer 211, then the laminated area is torn, the target is replaced, and the conductive layer of the other area (that is, the third conductive layer 31) is plated.

[0028] Since the sheet resistance of the conductive layer required for touch is different from the sheet resistance of the conductive layer required for acoustics, preferably, the sheet resistances of the third conductive layer 31 and the first conductive layer 211 are set to be different. Preferably, the sheet resistance of the third conductive layer 31 is greater than the sheet resistance of the first conductive layer 211. Of course, when it is compatible with a low-resistance material for touch, the sheet resistance of the third conductive layer 31 and the sheet resistance of the first conductive layer 211 may be selected to be the same. When plating the conductive layer in this way, coil plating may be performed to plate a conductive layer with the same sheet resistance over the entire lower end surface of the first substrate 1. The lower the sheet resistance of the conductive layer in the acoustic region 2 (i.e., the first conductive layer 211 here), the more advantageous it is for increasing the acoustic efficiency, and it is preferable to use a conductive material of 10 ohms or less.

[0029] The first edge conductive layer 212 is formed at least at the edge of the first conductive layer 211, that is, the first edge conductive layer 212 may be provided so as to surround only the outer edge of the first conductive layer 211 (excluding the edge adjacent to one side of the first interval region 5 on the left). The right half of the first substrate 1, the first conductive layer 211, and the first edge conductive layer 212 constitute the vibration layer of the acoustic unit.

[0030] The second electrode 22 includes a second conductive layer 221 and a second edge conductive layer 222. The fourth conductive layer 32 and the second conductive layer 221 are both formed on the upper end surface of the second substrate 4 and are respectively located on the left and right sides of the upper end surface of the second substrate 4, and are separated by a second interval region 6. Similar to the manufacturing process of the third conductive layer 31 and the first conductive layer 211, during manufacturing, first, a conductive layer is plated on the left half of the upper end surface of the second substrate 4, then a conductive layer is plated on the right half of the upper end surface of the second substrate 4, and then the second interval region 6 is etched or photo-etched in the middle region between the conductive layers on both sides. The second interval region 6 is a region without a conductive layer. In this way, the conductive layer on the left forms the fourth conductive layer 32, and the conductive layer on the right forms the second conductive layer 221. Also, sheet plating may be used. Specifically, first, the region for plating the fourth conductive layer 32 on the upper end surface of the second substrate 4 is laminated (of course, the region for plating the second conductive layer 221 may also be laminated, and the order is not limited), then a conductive layer is plated on the region for plating the second conductive layer 221 to form the second conductive layer 221, and then the laminated region is cut, the target is exchanged, and a conductive layer (i.e., the fourth conductive layer 32) of another region is plated. During implementation, the width of the first interval region and the second interval region is 20 μm or less, and the thickness of the adhesive 8 is 25 μm or less.

[0031] Similarly, since the sheet resistance of the conductive layer required for touch is different from the sheet resistance of the conductive layer required for sound, preferably, the sheet resistances of the fourth conductive layer 32 and the second conductive layer 221 are set to be different. Preferably, the sheet resistance of the fourth conductive layer 32 is greater than the sheet resistance of the second conductive layer 221. Of course, when the touch is compatible with a low-resistance material, the sheet resistances of the fourth conductive layer 32 and the second conductive layer 221 may be selected to be the same. When plating the conductive layer in this way, coil plating may be performed to plate a conductive layer with the same sheet resistance over the entire upper end surface of the second substrate 4. The lower the sheet resistance of the conductive layer in the acoustic region (i.e., the second conductive layer 221 here), the more advantageous it is for increasing the acoustic efficiency, and it is preferable to use a conductive material with a sheet resistance of 10 ohms or less.

[0032] The second edge conductive layer 222 is formed at least at the edge of the second conductive layer 221, that is, the second edge conductive layer 222 may be provided so as to surround only the outer edge of the second conductive layer 221 (excluding the edge adjacent to one side of the second interval region 6 on the left side).

[0033] The insulating layer 24 specifically includes a first insulating layer 241 and a first edge insulating layer 242. The first insulating layer 241 is formed on the upper end surface of the second base material 4 facing the first base material 1 and covers at least the second conductive layer 221 and the second edge conductive layer 222. In this embodiment, the first insulating layer 241 covers the second conductive layer 221 and the second edge conductive layer 222. The first edge insulating layer 242 is formed on the lower end surface of the first base material 1 facing the second base material 4 and covers at least the first edge conductive layer 212. In this embodiment, the first edge insulating layer 242 covers the first edge conductive layer 212. In other embodiments, the insulating layer may have other alternative structures. For example, an insulating layer may be provided on either the lower end surface of the first base material 1 or the entire upper end surface of the second base material 4, or an edge insulating layer covering only the first edge conductive layer 242 may be provided on the upper end surface of the second base material 4, as long as insulation between the first conductive layer 211 and the second conductive layer 221 can be achieved. During implementation, the thickness of the first insulating layer 241 may be 5 to 15 μm.

[0034] The fine structure 23 is provided between the first conductive layer 211 and the second conductive layer 221, and may be provided on the lower end surface of the first base material 1 or on the upper end surface of the second base material 4. When provided on the upper end surface of the second base material 4, specifically, it is provided on the upper end surface of the first insulating layer 241. During implementation, it is preferably provided on the upper end surface of the first insulating layer 241. During implementation, the thickness of the fine structure 23 may be 12 μm to 18 μm, and the size is 80 to 100 μm.

[0035] The second base material 4, the second conductive layer 221, the second edge conductive layer 222, the first insulating layer 241, and the microstructure 23 constitute the non-vibrating layer of the acoustic unit. The vibrating layer and the non-vibrating layer of the acoustic unit are bonded by a frame. Specifically, it means that the lower end surface of the first conductive layer 211 and the upper end surface of the first insulating layer 241 are bonded by a frame. In this embodiment, an edge fixing region 7 is provided on the outer edge of the first insulating layer 241. The edge fixing region 7 specifically includes a fixing region (not shown) located on the outer side and a non-fixing region (not shown) located on the inner side. In the fixing region, a double-sided tape may be used, and in the non-fixing region, silica gel or a UV adhesive may be used.

[0036] Also, the third conductive layer 31 and the fourth conductive layer 32 are completely bonded using an adhesive 8. The thickness of the adhesive 8 is preferably the same as the distance between the first conductive layer 211 and the second conductive layer 221. In this way, the height between the two regions on the left and right can be balanced. By matching the heights of the two regions on the left and right, it is beneficial to maximize the flatness of the visible region of the display unit and can ensure the maximization of the acoustic efficiency. During implementation, the thickness of the adhesive 8 is 30 μm or less, preferably 25 μm to 30 μm.

[0037] During implementation, the first conductive layer 211 and the second conductive layer 221 are preferably superconducting materials. The lower the sheet resistance, the more beneficial it is to improve the acoustic efficiency, and it is preferably a conductive material with a sheet resistance of 10 ohms or less. The third conductive layer 31 and the fourth conductive layer 32 may use a conductive material with a sheet resistance of 100 ohms to 150 ohms or less. Generally, a conductive material with a sheet resistance of 150 ohms or 100 ohms is used.

[0038] In addition, in the above technical means, the first substrate 1, the touch area 3, the acoustic area 2, and the second substrate 4 are combined such that half becomes a touch unit and the other half becomes an acoustic unit. That is, the touch unit is located on the left side and the acoustic unit is located on the right side. In this way, the left half of the overall formed touch acoustic display unit becomes the touch part, and the right half becomes the acoustic part. The two parts are provided at intervals in the left-right direction, and the functions of the two parts can be independent of each other and do not interfere with each other.

[0039] In one specific embodiment, the first substrate 1 uses a PET material with a thickness of 23 μm, and when the first conductive layer 211 and the second conductive layer 221 with a sheet resistance of 10 ohms, the microstructure 23 with a thickness of 12 μm - 18 μm, 80 μm - 100 μm, and the first insulating layer 241 with a thickness of 5 μm - 15 μm are aligned, the sound pressure can reach 70 - 80 db at 1 kHz.

[0040] As shown in FIGS. 4 and 5, the present invention further provides a touch acoustic display device including at least one touch acoustic display unit that can be touched on one half and can produce sound on the other half. It may include a plurality of joined touch acoustic display units. After joining, a plurality of touch areas and a plurality of acoustic areas can be formed, and the number and joining method of the touch acoustic display units can be selected as needed. For example, when the unit is used in an automobile, one touch acoustic display unit may be provided for the driver's seat, or one display unit may be provided for each of the passenger seat and the rear seat, and touch and sound can be realized at each seat.

[0041] On the one hand, as shown in FIG. 6, the manufacturing process of the touch acoustic display unit according to the present invention includes the following steps S1 - S3.

[0042] In S1, a third conductive layer and a first conductive layer, which are insulated from each other, are formed on the lower end surface of the first substrate. Then, a first edge conductive layer is formed at the edge of the first conductive layer. Then, a first edge insulating layer is formed on the first edge conductive layer. The first substrate, the first conductive layer, and the first edge conductive layer constitute the vibration layer of the acoustic unit.

[0043] In this embodiment, specifically, first, a conductive layer is plated on the left half of the lower end surface of the first substrate 1. Next, a conductive layer is plated on the right half of the lower end surface of the first substrate 1. Then, a first spacing region 5 is etched or photo-etched in the middle region between the conductive layers on both sides. The first spacing region 5 is a region without a conductive layer. In this way, the left conductive layer forms the third conductive layer 31, and the right conductive layer forms the first conductive layer 211. Also, sheet plating may be used. Specifically, first, the region for plating the third conductive layer 31 is laminated on the lower end surface of the first substrate 1 (of course, the region for plating the first conductive layer 211 may be laminated, and the order is not limited). Next, a conductive layer is plated on the region for plating the first conductive layer 211 to form the first conductive layer 211. Then, the laminated region is torn, the target is exchanged, and the conductive layer of another region (i.e., the third conductive layer 31) is plated. Then, a first edge conductive layer is formed at the edge of the first conductive layer.

[0044] In S2, a fourth conductive layer and a second conductive layer, which are insulated from each other, are formed on the upper end surface of the second substrate. Then, a second edge conductive layer is formed at the edge of the second conductive layer. Then, a first insulating layer is formed over the entire upper surface of the second conductive layer. Then, a fine structure is formed on the upper end surface of the first insulating layer. The second substrate, the second conductive layer, the second edge conductive layer, the first insulating layer, and the fine structure constitute the non-vibration layer of the acoustic unit.

[0045] Specifically, in this embodiment, similar to the process of forming the conductive layer on the first substrate, during manufacturing, first, a conductive layer is plated on the left half of the upper end surface of the second substrate 4, and then, a conductive layer is plated on the right half of the upper end surface of the second substrate 4. After that, the second spacing region 6 is etched or photo-etched in the intermediate region between the conductive layers on both sides. The second spacing region 6 is a region without a conductive layer. In this way, the conductive layer on the left forms the fourth conductive layer 32, and the conductive layer on the right forms the second conductive layer 221. Also, sheet plating may be used. Specifically, first, the region for plating the fourth conductive layer 32 on the upper end surface of the second substrate 4 is laminated (of course, the region for plating the second conductive layer 221 may be laminated, and the order is not limited). Next, a conductive layer is plated on the region for plating the second conductive layer 221 to form the second conductive layer 221. After that, the laminated region is torn, the target is exchanged, and a conductive layer (i.e., the fourth conductive layer 32) of another region is plated to form the fourth conductive layer 32. Then, a second edge conductive layer 222 is formed at the edge of the second conductive layer 221. After that, a first insulating layer 241 that covers the second edge conductive layer 222 and the second conductive layer 221 is formed on the second conductive layer 221. After that, a fine structure 23 is formed on the first insulating layer 241.

[0046] In S3, the third conductive layer and the fourth conductive layer are completely bonded together, and the vibrating layer and the non-vibrating layer are bonded together by a frame. After bonding, a touch unit is formed on one side of the manufactured touch acoustic display unit, and an acoustic unit is formed on the other side.

[0047] Specifically, in this embodiment, the third conductive layer 31 and the fourth conductive layer 32 are completely bonded together using an adhesive 8. It is preferable that the thickness of the adhesive 8 is the same as the distance between the first conductive layer 211 and the second conductive layer 221. The vibrating layer and the non-vibrating layer of the acoustic unit are bonded together by a frame. Specifically, it means that the lower end surface of the first conductive layer 211 and the upper end surface of the first insulating layer 241 are bonded together by a frame. In this way, an air gap necessary for the vibration of the vibrating layer is formed between the vibrating layer and the non-vibrating layer.

[0048] Preferably, when laminating the first substrate and the second substrate, they can be tensioned and laminated using a heat tension process or a jig tension process. For the specific tension process, reference can be made to the description in the previously filed application number CN202210469615.3, the invention titled "Vibration Layer Tension Process of a Directional Acoustic Display Screen", and the description will be omitted here.

[0049] The advantages of the present invention are as follows. 1. In the present invention, by combining an electrostatic ultrasonic transducer and a touch screen, the display device can emit sound by directing the screen on one side and can be touched on the other side. The two sides do not interfere with each other, realizing screen-directed sound, enabling private listening and avoiding interference with surrounding people, while also having a touch function, expanding its application range, and being applicable to automobiles. 2. In the present invention, by using two substrate layers and combining the corresponding manufacturing processes and combinations of different material parameters, the audible sound pressure level of the formed display device at 1 KHz can reach 70 - 80 dB.

[0050] The above description of the specific exemplary embodiments of the present invention is for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the exact form disclosed, and it is obvious that many modifications and changes are possible based on the above teachings. The purpose of selecting and describing exemplary embodiments is to enable those skilled in the art to understand the specific principles of the present invention and its practical applications, so that they can realize and utilize various different exemplary embodiments, various different selections, and changes of the present invention. The scope of the present invention is intended to be limited by the claims and their equivalents.

Description of Reference Numerals

[0051] 1 First substrate 2 Acoustic region 21 First electrode 211 First conductive layer 212 First edge conductive layer 22 Second electrode 221 Second conductive layer 222 Second edge conductive layer 23 Microstructure 24 Insulating layer 241 First insulating layer 242 First edge insulating layer 3 Touch area 31 Third conductive layer 32 Fourth conductive layer 4 Second substrate 5 First spacing area 6 Second spacing area 7 Edge fixing area 8 Adhesive

Claims

1. A touch acoustic display unit comprising a first substrate, a functional region, and a second substrate, which are stacked in order from top to bottom, wherein the functional region includes a touch region and an acoustic region, the touch region and the acoustic region are both located between the first substrate and the second substrate and are provided at intervals in the horizontal direction, sharing the first substrate and the second substrate, and the acoustic region is an electrostatic ultrasonic transducer.

2. The electrostatic ultrasonic transducer includes a first electrode, a second electrode, and a microstructure, the first electrode is formed on the lower end surface of the portion of the first substrate facing the second substrate, the second electrode is formed on the upper end surface of the portion of the second substrate facing the first substrate, the microstructure is formed between the first electrode and the second electrode to provide an air gap necessary for vibrating the acoustic layer to produce sound, and the outer edges of the first substrate and the second substrate located in the acoustic region are bonded to a frame. The touch acoustic display unit according to claim 1, characterized in that.

3. The first electrode includes a first conductive layer and a first edge conductive layer, the second electrode includes a second conductive layer and a second edge conductive layer, the first conductive layer is formed on the lower end surface of the portion of the first substrate facing the second substrate, the first edge conductive layer is formed on the edge of the first conductive layer located on at least one side of the acoustic region, the second conductive layer is formed on the upper end surface of the portion of the second substrate facing the first substrate, and the second edge conductive layer is formed on the edge of the second conductive layer located on at least one side of the acoustic region. The touch acoustic display unit according to claim 2, characterized in that.

4. The electrostatic ultrasonic transducer further includes an insulating layer, the insulating layer includes a first insulating layer and a first edge insulating layer, the first insulating layer is formed on the upper end surface of the portion of the second substrate facing the first substrate and covers at least the second conductive layer and the second edge conductive layer, the microstructure is formed on the first insulating layer, and the first edge insulating layer is formed on the lower end surface of the portion of the first substrate facing the second substrate and covers at least the first edge conductive layer. The touch acoustic display unit according to claim 3, characterized in that.

5. The touch region includes a third conductive layer and a fourth conductive layer. The third conductive layer is formed on the lower end surface of the portion of the first base material facing the second base material, and is provided at a horizontal interval from the first conductive layer. The fourth conductive layer is formed on the upper end surface of the portion of the second base material facing the first base material, and is provided at a horizontal interval from the first conductive layer. The touch acoustic display unit according to claim 3, characterized in that.

6. The third conductive layer is flush with the lower end surface of the first conductive layer, and is separated so that it is insulated from the first conductive layer by a first interval region. The fourth conductive layer is flush with the lower end surface of the second conductive layer, and is separated so that it is insulated from the second conductive layer by a second interval region. The touch acoustic display unit according to claim 5, characterized in that.

7. The third conductive layer and the fourth conductive layer are adhered and bonded by an adhesive. The thickness of the adhesive is the same as the distance between the first conductive layer and the second conductive layer. The touch acoustic display unit according to claim 6, characterized in that.

8. The third conductive layer has a sheet resistance higher than that of the first conductive layer, and the fourth conductive layer has a sheet resistance higher than that of the second conductive layer. The touch acoustic display unit according to claim 5, characterized in that.

9. Both the first base material and the second base material are PET films. The first base material has a thickness of 20 μm to 25 μm. The second base material has a thickness of 50 μm to 55 μm. The first interval region and the second interval region have a width of 20 μm or less, and the thickness of the adhesive is 30 μm or less. The touch acoustic display unit according to claim 7, characterized in that.

10. Including the touch acoustic display unit according to any one of claims 1 to 9 or a plurality of joined touch acoustic display units according to any one of claims 1 to 9. The touch acoustic display device, characterized in that.

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