CN115086830A

CN115086830A - Directional display device and electronic device

Info

Publication number: CN115086830A
Application number: CN202210470262.9A
Authority: CN
Inventors: 匡正; 张阳; 胡亚云; 毛峻伟
Original assignee: Suzhou Hear Acoustic Technology Ltd
Current assignee: Suzhou Hear Acoustic Technology Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-20
Anticipated expiration: 2042-04-28
Also published as: CN115086830B

Abstract

The invention discloses a directional display device and an electronic device, wherein the directional display device comprises a display screen and a sounding layer, the display screen comprises a display layer and an integrally conductive bottom plate, the display layer is arranged on the outer side of the bottom plate and close to a client, the sounding layer is arranged between the display layer and the bottom plate, the sounding layer comprises a first electrode, a microstructure and a second electrode which are stacked from the display layer to the bottom plate, the display layer and the first electrode form a vibration layer of the sounding layer, and an air gap required by vibration of the vibration layer is formed between the first electrode and the second electrode under the action of the microstructure. According to the invention, the electrostatic sounding layer is inserted between the display layer and the bottom plate of the existing display screen, so that the existing display screen can be combined with the sounding layer, directional sounding of a screen or sounding of a traditional screen is realized, and the display screen can be applied to various display fields.

Description

Directional display device and electronic device

Technical Field

The invention relates to the technical field of directional sounding of screens, in particular to a directional display device and an electronic device.

Background

The display device is ultra-thin, has a narrow frame, and even is designed in a full screen mode, and the space reserved for the sound production device is smaller and smaller. The conventional sound generating device is large in size, the installation position is limited, and a proper position and space are difficult to be provided in a new generation of display devices. Therefore, there is a need to redesign a sound emitting device capable of adapting to the requirements of the current display device.

Some manufacturers of display devices design a mode of making sound by using a screen, and the screen sound making technology is taken as a surface audio technology, so that a new solution is provided for the sound of multimedia audio-visual equipment. At present, a transparent screen directional loudspeaker combining a display device and a screen sounding device is under development, the self vibration of a screen is used as the loudspeaker, the resonant cavity space of the traditional loudspeaker is saved, and meanwhile, the directional propagation characteristic meets the privacy requirement of personal electronic equipment and the non-interfering requirement of public equipment.

How to combine together current display screen and directional loudspeaker, make the display can integrate screen orientation sound production, show etc. and be many functions in an organic whole, be the problem that needs to solve at present.

The invention content is as follows:

the invention aims to provide a directional display device capable of being combined with a display screen and an electronic device.

In order to achieve the above object, in one aspect, the present invention provides a directional display device, including a display screen and a sound generation layer, where the display screen includes a display layer and an integrally conductive bottom plate, the display layer is disposed on an outer side of the bottom plate and is close to a client, the sound generation layer is disposed between the display layer and the bottom plate, the sound generation layer includes a first electrode, a microstructure, and a second electrode stacked from the display layer to the bottom plate, the display layer and the first electrode form a vibration layer of the sound generation layer, and an air gap required for the vibration layer to vibrate is formed between the first electrode and the second electrode under the action of the microstructure.

In a preferred embodiment, the display screen is an OLED display screen, an LED display screen or an LCD display screen.

In a preferred embodiment, the display layer includes a light emitting layer, and the sound emitting layer is disposed between the light emitting layer and the base plate.

In a preferred embodiment, the display layer includes a light emitting layer and a substrate, and the sound emitting layer is disposed between the light emitting layer and the substrate or the sound emitting layer is disposed between the substrate and the base plate. .

In a preferred embodiment, the display screen further includes a protection layer disposed outside the display layer and near the client.

In a preferred embodiment, the display screen further includes a polarizer, and the polarizer is disposed between the protection layer and the display layer, or the polarizer is disposed between the protection layer and the display layer and integrally disposed with the protection layer.

In a preferred embodiment, the first electrode includes a first conductive layer and a first edge trace, the second electrode includes a second conductive layer and a second edge trace, the first edge trace is disposed on an edge of a lower surface of the first conductive layer away from the client, the second edge trace is disposed on an edge of an upper surface of the second conductive layer close to the client, and the microstructure is located between the first conductive layer and the second conductive layer.

In a preferred embodiment, the second conductive layer is directly the bottom plate, or the second conductive layer is disposed between the bottom plate and the first electrode.

In a preferred embodiment, the first conductive layer and the second conductive layer adopt indium tin oxide and/or nano silver, or a metal grid, or a composite structure of the metal grid and indium tin oxide or nano silver.

In a preferred embodiment, the sound generating layer further comprises an insulating layer for insulating, and the insulating layer is disposed between the first electrode and the second electrode.

In a preferred embodiment, when the second conductive layer is disposed on the upper surface of the backplane near the client, the sheet resistance of the second conductive layer is in milliohm.

In a preferred embodiment, the vibrating layers with different thicknesses are matched with the microstructures with different shapes, the thickness of the vibrating layer is 50 um-1 mm, the size of each microstructure is less than 1cm, the height of each microstructure is 2 um-1 mm, and the center distance between every two adjacent microstructures is 10um-2 cm.

In a preferred embodiment, the microstructure is arranged to form a plurality of array units arranged in an array, and each array unit is a regular hexagon or a square or other regular or irregular shape.

In a preferred embodiment, a central point is arranged at the central part of each array unit, and the height of the central point is less than half of the height of the edge microstructure.

In a preferred embodiment, the central point and the microstructure are realized by a silk-screen printing or exposure developing process.

In a preferred embodiment, the protective layer is a polyimide protective film, the material of the microstructure adopts a dry film material or transparent ink, and the transparent ink is polyester or polyurethane transparent ink.

In another aspect, the present invention provides an electronic device, including the directional display device described above.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the electrostatic sounding layer is inserted between the display layer and the bottom plate of the existing display screen, so that the existing display screen can be combined with the sounding layer, directional sounding of a screen or sounding of a traditional screen is realized, and the display screen can be applied to various display fields.

2. According to the invention, the whole of the other layers of the display screen except the bottom plate are used as the acoustic sounding layer, the bottom plate is used as the acoustic base layer, and the bottom plate is conductive, so that the bottom plate can be directly used as one of the electrodes of the sounding layer, or the conductive layer arranged on the surface of the bottom plate can be in the milliohm level, and the whole sounding efficiency of the sounding layer can be effectively improved.

3. According to the invention, the vibration layers with different thicknesses are matched with the microstructures with different shapes and different distribution structures, and the corresponding parameter setting and preparation processes are matched, so that the integral transmittance of the finished product is high, the probability of producing rainbow lines and moire lines is low, and the audible sound pressure level of 1KHz can reach 70-80 db.

4. The middle point is additionally arranged in the middle of the sounding unit, so that the reliability of a finished product in a working state can be improved.

Description of the drawings:

FIG. 1 is a schematic view of a directional display device according to the present invention;

FIG. 2 is a schematic view of a sound generation layer disposed between a substrate and a base plate according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a sound emitting layer disposed between a light emitting layer and a substrate according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second conductive layer with a bottom plate directly serving as a second electrode according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a sounding layer according to another embodiment of the present invention;

FIG. 6 is a schematic view of a sound producing layer disposed between a substrate and a base plate according to another embodiment of the present invention;

FIG. 7 is a graph showing frequency response simulation curves of different center distances of the corresponding microstructures of the vibration layer with the same thickness;

FIG. 8 is a graph showing frequency response simulation of vibration layers of different thicknesses according to the present invention.

The reference signs are:

1. the sound generating layer 11, the first electrode 111, the first conducting layer 112, the first edge wire 12, the microstructure 13, the second electrode 131, the second conducting layer 132, the second edge wire 14, the insulating layer 141, the first insulating layer 142, the second insulating layer 2, the display layer 21, the light emitting layer 22, the substrate 3, the bottom plate 4, the polarizer 5, the protective layer 6, and the central point.

The specific implementation mode is as follows:

the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

According to the directional display device and the electronic device disclosed by the invention, the electrostatic sounding layer is inserted between the display layer and the bottom plate of the existing display screen, so that the existing display screen can be combined with the sounding layer to realize directional sounding of the screen, and the directional display device and the electronic device can be applied to various display fields.

As shown in fig. 1, a directional display device disclosed in the embodiment of the present invention includes a display screen and a sound layer 1, wherein the display screen includes a display layer 2 and a base plate 3 that is electrically conductive as a whole, the sound layer 1 is interposed between the display layer 2 and the base plate 3, that is, all the layers above the base plate 3 (including the display layer 2 and the sound layer 1) except the base plate 3 are used as an acoustic sound layer as a whole, and the base plate 3 is used as an acoustic base layer, in an embodiment, the base plate 3 may be an SUS stainless steel plate, and the thickness may be 150 um. The directional display device provided by the invention can realize that the display screen can display and can also directionally sound.

Specifically, the display layer 2 is disposed outside the bottom plate 3 and near the client, and as shown in fig. 2 and 3, it may specifically include a light emitting layer 21 and a substrate 22, where the light emitting layer 21 is located at the outermost side near the client, and the substrate 22 is located between the light emitting layer 21 and the bottom plate 3. When the display screen is an OLED display screen, the light-emitting layer 21 may be an OLED light-emitting layer, and the thickness of the light-emitting layer is 40 um; the substrate 22 may be a polyimide PI substrate, with a thickness of 50um being useful.

In practice, the sound emission layer 1 may be interposed between the light emission layer 21 and the substrate 22 as shown in fig. 3, or between the substrate 22 and the chassis base 3 as shown in fig. 2.

In this embodiment, as shown in fig. 2 to 6, the sounding layer 1 specifically includes a first electrode, a microstructure, and a second electrode stacked from the display layer to the bottom plate, where the first electrode 11 includes a first conductive layer 111 and a first edge trace 112, the second electrode 13 includes a second conductive layer 131 and a second edge trace 132, the first edge trace 112 is disposed on an edge of the first conductive layer 111 that is far away from the lower surface of the client, the second edge trace 132 is disposed on an edge of the second conductive layer 131 that is close to the upper surface of the client, and the microstructure 12 is located between the first conductive layer 111 and the second conductive layer 131.

In practice, the second conductive layer 131 may directly adopt the conductive bottom plate 3, as shown in fig. 4, that is, the bottom plate 3 is directly used as the second conductive layer 131, the second edge trace 132 is disposed on the edge of the lower surface of the bottom plate 3 away from the client, and at this time, the bottom plate 3 and the second edge trace 132 form the second electrode 11. It is of course also possible to provide a second conductive layer 131 on the upper surface of the body 3 close to the customer end, as shown in fig. 2. However, in the embodiment shown in fig. 2, since the non-surface-treated substrate 3 is entirely conductive by itself, the sheet resistance of the second conductive layer 131 on the substrate 3 may be in milliohms. The lower the sheet resistance of the conductive layer is, the more favorable the improvement of the whole sound pressure level of the product is, so that the scheme of using the bottom plate 3 as the second electrode 11 or a part of the second electrode 11 can effectively improve the whole sound production efficiency of the product. In addition, because of the requirement of light transmission of the whole product, the first conductive layer 111 and the second conductive layer 131 of the present invention may adopt indium tin oxide or nano silver, or indium tin oxide plus nano silver, or metal mesh (metal mesh), or a composite structure of metal mesh and indium tin oxide or nano silver. In practice, the sheet resistance of the first conductive layer 111 and the second conductive layer 131 is generally greater than 10 ohms because of the transmittance requirement, but the second conductive layer 131 can be made milliohms level because of the conductivity of the bottom plate 3 itself.

Preferably, an insulating layer 14 for insulating the first electrode 11 from the second electrode 13 is further disposed between the first electrode 11 and the second electrode 13, and the structure of the insulating layer 14 may be various, if the first insulating layer 141 covering the first conductive layer 111 and the first edge trace 112 is formed entirely under the first conductive layer 111 and the first edge trace 112, meanwhile, a second insulating layer 142 covering the second conductive layer 131 and the second edge trace 132 is formed over the second conductive layer 131 and the second edge trace 132, or, the entire insulating layer is formed only on one side, for example, the entire insulating layer 141 is formed only under the first conductive layer 111 and the first edge trace 112 to cover the first conductive layer 111 and the first edge trace 112, or the entire insulating layer 142 is formed only under the second conductive layer 131 and the second edge trace 132 to cover the second conductive layer 131 and the second edge trace 132. Alternatively, a first frame insulating layer (not shown) covering the first edge trace 112 may be formed below the first edge trace 112, and a second middle insulating layer (not shown) covering the second conductive layer 131 and the second edge trace 132 may be formed entirely above the second conductive layer 131 and the second edge trace 132 or only the second conductive layer 131 may be formed to cover only the second conductive layer 131; on the contrary, a second frame insulating layer (not shown) covering the second edge trace 132 may be formed above the second edge trace 132, and a first middle insulating layer (not shown) covering the first conductive layer 111 and the first edge trace 112 may be formed below the first conductive layer 111 and the first edge trace 112 entirely or only the first conductive layer 111 may be formed below the first conductive layer 111 and only the first conductive layer 111 may be formed. Of course, the present invention is also applicable to other insulating layer 14 structures that can achieve insulation between the first electrode 11 and the second electrode 13, as long as the insulating layer 14 satisfies a breakdown voltage of 400V or more in a finished product test, and the thickness can be changed according to the material, i.e., the invention is not limited to the above-mentioned methods.

The microstructures 12 can be optionally disposed under the first insulating layer 141, or can be optionally disposed on the second insulating layer 142, preferably on the second insulating layer 142, so that the thickness of the entire vibration layer can be reduced, thereby improving the sound pressure level of the entire product. In practice, the shape of the microstructure 12 can be various, such as cylindrical, triangular, square, etc., and the corresponding cross-sectional shapes are circular, triangular, and square, respectively. In addition, theoretically, the smaller the size of the microstructure is, the higher the overall transmittance of the final product is, and the lower the probability of rainbow patterns and moire patterns generated by the product is, and through experiments, the size of the microstructure 12 can be set to be less than 1cm, preferably less than 600um, and generally 50um to 100um is selected. The height of the microstructure 12 may be set to 2um to 1mm, preferably 10um to 17 um. Theoretically, the smaller the center distance between the microstructures 12 is, the higher the resonant frequency of the product is, but the lower the overall transmittance of the product is; on the contrary, the larger the center distance between the microstructures 12 is, the lower the resonant frequency of the product is, but the higher the overall transmittance of the product is, so that the product transmittance is ensured to be high while the product resonant frequency is high by selecting the corresponding center distance. Through tests, the center distance between two adjacent microstructures 12 can be set to be 10um-2cm, preferably 0.1mm-10mm, and if the center distance of 1.1mm is adopted, the requirement that the product has high resonant frequency can be met, and meanwhile, the product can reach high product transmittance. In practice, the microstructure 12 can be made of a dry film material with high light transmittance or a transparent ink such as polyester or polyurethane. An air gap required for the vibration of the vibration layer is formed between the first electrode 11 and the second electrode 13 under the action of the microstructure 12.

In addition, the vibration layers with different thicknesses are matched with the microstructures 12 with different shapes, and particularly, the thickness of the vibration layer can be set to be 50 um-1 mm. The vibration layers with different thicknesses need to be matched with different center distance patterns of the microstructures 12, and the efficiency can reach the maximum under a certain working voltage. As shown in fig. 7, it is a frequency response acoustic simulation diagram of a vibrating layer with a thickness of 100um and different center distances. It can be seen from the figure that the smaller the center-to-center distance between the microstructures 12, the higher the resonant frequency of the product, and the larger the sound pressure level; as shown in fig. 8, the frequency response acoustic simulation diagram is corresponding to vibration layers with different thicknesses. As can be seen from fig. 8, the thickness of the entire vibration layer is reduced, and the higher the resonance frequency of the product, the higher the sound pressure level. Of course, the shape of the microstructure 12, the thickness of the vibration layer, and the like are not limited to those defined herein, and other microstructures 12 and vibration layers having a size, a height, and the like that satisfy the requirements of acoustic simulation are also applicable to the present invention.

The microstructures 12 may also be arranged to form a plurality of array units (not shown) arranged in an array, and each array unit may be a regular hexagon or a square or other regular or irregular shape.

Preferably, as shown in fig. 5, a central point 6 may be added to the central portion of each array unit, which may effectively improve the reliability of the product in the operating state. During implementation, the height of the central point 6 can be set to be less than half of the height of the edge microstructure, and if the height of the edge microstructure is 10um to 17um, the height of the central point 6 can be set to be 5um to 8 um. Generally, the design is 5 um-8 um optimal. Due to the limitation of the process technology and materials, the screen printing process and the exposure development process are easier to realize that the height of the central point is 5 um-8 um: the silk screen printing of 5-8 um can adjust the viscosity of the printing ink and match the material of the screen printing plate; the dry film developing process can select a transparent dry film with the thickness of 5-8 um of the raw material, and the film pressing exposure developing process is matched.

Preferably, the display screen still can include protective layer 5, and protective layer 5 can adopt polyimide (CPI) protection film when implementing, or the protection film of other materials, and the thickness of protection film can adopt 10um ~ 80um, and several commonly used preferred thickness values are 12um, 25um, 30um, 50um, 80um respectively. And when the CPI protective film is implemented, a single layer or multiple layers can be adopted, and when the CPI protective film is multiple layers, the CPI protective films are completely attached.

In another embodiment, the display panel may further include a Polarizer (POL)4, and the polarizer 4 may be generally located below the protective layer 5 (i.e., near the side of the display layer 2), or may be integrally disposed with the protective layer 5. In practice, the thickness of the polarizer 4 is generally more than 50um, and several commonly used preferred thicknesses are 50um, 70um and 80um respectively; when provided integrally with the protective layer 5, a typical thickness is 80 um. In addition, the display layer 2 is disposed under the polarizer 4, or in other embodiments, an optical compensation film (Cop, not shown) is disposed under the polarizer 4, and the display layer 2 is disposed under the optical compensation film, that is, the polarizer 4 is disposed between the protective layer 5 and the display layer 2, and the optical compensation film 5 is disposed between the polarizer 4 and the display layer 2. In practice, the thickness of the optical compensation film is generally 20um to 40um, and 30um can be used.

As shown in fig. 3, when the sound generating layer 1 is disposed between the light emitting layer 21 and the substrate 22, the first conductive layer 111 is disposed below the light emitting layer 21 on the side close to the client, and the second conductive layer 131 is disposed above the substrate on the side close to the display layer, in this case, the laminated layer above the light emitting layer 21 (including the protective layer 5 and the polarizer 4), the light emitting layer 21 and the first electrode 11 or the laminated layer above the light emitting layer 21, the first electrode 11, and the first insulating layer 141 constitute a vibration layer of the sound generating layer 1, and the other structures except the vibration layer constitute a base of the directional display device.

As shown in fig. 2, when the sounding layer 1 is disposed between the substrate 22 and the chassis 3, the first conductive layer 111 is disposed below the substrate, and the second conductive layer 131 is disposed above the chassis, in this case, the laminated layer above the light-emitting layer 21 (including the protective layer 5 and the polarizer 4), the light-emitting layer 21, the substrate 22, and the first electrode 11 or the laminated layer above the light-emitting layer 21, the substrate 22, the first electrode 11, and the first insulating layer 141 constitute a vibration layer of the sounding layer 1, and the other structures except the vibration layer constitute a chassis of the directional display device.

According to the invention, before the acoustic sounding layer and the acoustic base layer are subjected to frame pasting, the tensity of the acoustic sounding layer needs to be ensured, in one embodiment, the acoustic sounding layer is completely aged before the frame pasting, the size cannot expand or contract at high temperature (generally 150 ℃), then a tensioning jig or a tensioning and pasting machine is adopted to ensure that the acoustic sounding layer is pasted with the acoustic base layer in a certain tensioning degree, AB glue or silica gel is adopted to reheat four sides of the acoustic sounding layer after the pasting or the acoustic sounding layer is solidified under the UV illumination condition, and the tensioning mechanism is not removed all the time in the solidification process. In another embodiment, the acoustic sounding layer is provided with a material expansion and shrinkage space before frame pasting, no tensioning mechanism is adopted, such as a jig and a machine table, the acoustic base layer and the acoustic sounding layer on the upper layer are frame pasted, the four sides of the acoustic sounding layer are cured by AB glue or silica gel under heating or UV illumination, the curing temperature and time are consistent with the expansion and shrinkage node temperature and time of the acoustic sounding layer, for example, in an implementation case, optical grade PET film materials with Transverse (TD) and longitudinal (MD) directions of less than 1% are aged at 150 ℃, the aging time is 1h, AB glue or silica gel cured at less than 150 ℃ is adopted, the thermal shrinkage temperature is not less than 150 ℃, and the time is not less than 1 h.

The invention also discloses an electronic device which comprises the directional display device, such as electronic equipment needing display devices, such as a computer, a television, a panel and the like.

The invention has the advantages that 1, the electrostatic sounding layer is inserted between the display layer and the bottom plate of the existing display screen, so that the existing display screen can be combined with the sounding layer to realize directional sounding of the screen, and the invention can be applied to various display fields. 2. According to the invention, the whole of the other layers of the display screen except the bottom plate are used as the acoustic sounding layer, the bottom plate is used as the acoustic base layer, and the bottom plate is conductive, so that the bottom plate can be directly used as one of the electrodes of the sounding layer, or the conductive layer arranged on the surface of the bottom plate can be in the milliohm level, and the whole sounding efficiency of the sounding layer can be effectively improved. 3. According to the invention, the vibration layers with different thicknesses are matched with the microstructures with different shapes and different distribution structures, and the corresponding parameter setting and preparation processes are matched, so that the integral transmittance of the finished product is high, the probability of generating rainbow lines and moire lines is low, and the audible sound pressure level of 1KHz can reach 70-80 db. 4. The middle point is additionally arranged in the middle of the sounding unit, so that the reliability of a finished product in a working state can be improved.

The foregoing descriptions of specific exemplary embodiments of the present invention have been 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 certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and 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

1. The utility model provides a directional display device, its characterized in that, includes display screen and sound production layer, the display screen includes display layer and whole electrically conductive bottom plate, the display layer sets up in the outside of bottom plate and is close to the customer end, the sound production layer set up in between display layer and the bottom plate, the sound production layer includes from display layer to bottom plate direction pile up first electrode, microstructure and the second electrode that sets up mutually, the display layer with first electrode constitutes the vibration layer of sound production layer, be in between first electrode and the second electrode form the confession under the effect of microstructure the required air gap of vibration layer vibration.

2. A directional display device according to claim 1, wherein the display screen is an OLED display screen, an LED display screen or an LCD display screen.

3. A directional display device according to claim 1, wherein the display layer comprises a light-emitting layer and the sound-generating layer is disposed between the light-emitting layer and the backplane.

4. A directional display device according to claim 1, wherein the display layer comprises a light-emitting layer and a substrate, and the sound-emitting layer is disposed between the light-emitting layer and the substrate, or the sound-emitting layer is disposed between the substrate and a backplane.

5. A directional display device according to claim 1, wherein the display screen further comprises a protective layer disposed outside the display layer and adjacent to the client.

6. A directional display device according to claim 5, wherein the display screen further comprises a polarizer disposed between the protective layer and the display layer, or wherein the polarizer is disposed between the protective layer and the display layer and is integral with the protective layer.

7. A directional display device according to any one of claims 1 to 6, wherein the first electrode comprises a first conductive layer and a first edge trace, the second electrode comprises a second conductive layer and a second edge trace, the first edge trace is disposed on the edge of the first conductive layer away from the lower surface of the client, the second edge trace is disposed on the edge of the second conductive layer close to the upper surface of the client, and the microstructure is located between the first conductive layer and the second conductive layer.

8. A directional display device according to claim 7, wherein the second conductive layer is directly the backplane or the second conductive layer is disposed between the backplane and the first electrode.

9. A directional display device according to claim 7, wherein the first and second conductive layers are formed from indium tin oxide and/or nano-silver, or a metal grid, or a composite of a metal grid and indium tin oxide or nano-silver.

10. A directional display device according to claim 1, wherein said sound generating layer further comprises an insulating layer for insulating, said insulating layer being disposed between said first electrode and said second electrode.

11. A directional display device according to claim 8, wherein when said second conductive layer is disposed on the upper surface of said backplane adjacent to the client, the sheet resistance of said second conductive layer is in the milliohm range.

12. A directional display device according to claim 1, wherein vibrating layers of different thicknesses are fitted to said microstructures of different shapes, said vibrating layer has a thickness of 50um to 1mm, said microstructures have a size of 1cm or less and a height of 2um to 1mm, and the distance between centers of two adjacent microstructures is 10um to 2 cm.

13. A directional display device according to claim 12, wherein said microstructure is arranged to form a plurality of array cells arranged in an array, each of said array cells being in the form of a regular hexagon or square or other regular or irregular shape.

14. A directional display device according to claim 13, wherein a central point is provided at the central portion of each of said array elements, said central point having a height less than half the height of the edge microstructure.

15. An alignment display device according to claim 6, wherein the protective layer is a polyimide protective film, the material of the microstructure is a dry film material or a transparent ink, and the transparent ink is a polyester or polyurethane transparent ink.

16. An electronic device comprising a directional display device according to any one of claims 1 to 15.