CN115086830B - Directional display device and electronic device - Google Patents
Directional display device and electronic device Download PDFInfo
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- CN115086830B CN115086830B CN202210470262.9A CN202210470262A CN115086830B CN 115086830 B CN115086830 B CN 115086830B CN 202210470262 A CN202210470262 A CN 202210470262A CN 115086830 B CN115086830 B CN 115086830B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
- G09F9/335—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
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- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Otolaryngology (AREA)
- Health & Medical Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
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 a bottom plate which is integrally conductive, the display layer is arranged on the outer side of the bottom plate and is 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 vibrating layer of the sounding layer, and an air gap required by vibration of the vibrating 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 the screen or sounding of the traditional screen can be realized, and the display screen can be applied to various display fields.
Description
Technical Field
The invention relates to the technical field of screen directional sounding, in particular to a directional display device and an electronic device.
Background
The ultra-thin, narrow bezel, and even full screen design of the display device leaves less and less room for the sound emitting device. While the conventional sound emitting device is large in size, the installation position is limited, and it is difficult to have a proper position and space in the new generation of display devices. Therefore, there is a need to redesign sound emitting devices that can accommodate the needs of current display devices.
Some manufacturers of display devices design a mode of sounding with a screen, and the screen sounding technology is used as a surface audio technology, so that a new solution is provided for the sound of the multimedia audio-visual equipment. At present, a transparent screen directional loudspeaker combining a display device and a screen sounding device is under development, screen self vibration is utilized 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 mutual noninterference requirement of public equipment.
How to combine the existing display screen with the directional loudspeaker, so that the display can integrate the screen directional sounding, display and other functions into a whole is a problem to be solved at present.
The invention comprises the following steps:
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 sounding 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 sounding layer is disposed between the display layer and the bottom plate, the sounding 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 vibrating layer of the sounding layer, and an air gap required by vibration of the vibrating layer 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 protective layer, and the protective layer is disposed on an outer side of the display layer and close to the client.
In a preferred embodiment, the display screen further includes a polarizer, where the polarizer is disposed between the protective layer and the display layer, or the polarizer is disposed between the protective layer and the display layer and is integrally disposed with the protective 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 at an edge of the first conductive layer away from a lower surface of the client, the second edge trace is disposed at an edge of the second conductive layer near an upper surface of the client, and the microstructure is disposed 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 bottom plate near the upper surface of the client, the sheet resistance of the second conductive layer is milliohm.
In a preferred embodiment, the vibration layers with different thicknesses are matched with the microstructures with different shapes, the thickness of the vibration layer is 50 um-1 mm, the size of the microstructures is less than 1cm, the height is 2 um-1 mm, and the center distance between two adjacent microstructures is 10um-2 cm.
In a preferred embodiment, the microstructure arrangement forms a plurality of array units arranged in an array, and each array unit is regular hexagon or square or other regular or irregular shapes.
In a preferred embodiment, the central portion of each of the array units is provided with a central point, and the height of the central point is less than half of the height of the edge microstructure.
In a preferred embodiment, the center point and microstructure are realized using a silk screen or an exposure development process.
In a preferred embodiment, the protective layer is a polyimide protective film, the microstructure is made of 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 above-mentioned directional display device.
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 the screen or sounding of the traditional screen can be realized, and the display screen can be applied to various display fields.
2. According to the invention, the whole layers of the display screen except the bottom plate are taken as the acoustic sounding layer, and the bottom plate is taken as the acoustic base layer, so that the bottom plate can be directly taken as one electrode of the sounding layer, or the conducting layer arranged on the surface of the bottom plate can achieve milliohm level, and the whole sounding efficiency of the sounding layer can be effectively improved.
3. According to the invention, through matching the vibrating layers with different thicknesses with microstructures with different shapes and different distribution structures and matching with corresponding parameter setting and preparation processes, the overall transmittance of a finished product is high, the probability of rainbow lines and moire lines is low, and the sound pressure level of 1KHz audible sound can reach 70-80 db.
4. The middle point is additionally arranged in the middle of the sounding unit, so that the reliability of the finished product in a working state can be improved.
Description of the drawings:
FIG. 1 is a schematic diagram of a directional display device according to the present invention;
FIG. 2 is a schematic diagram of a sound layer between a substrate and a base plate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a structure in which a sounding layer is located between a light emitting layer and a substrate according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a structure of a second conductive layer with a bottom plate directly serving as a second electrode according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a sounding layer according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a sound-emitting layer between a substrate and a base plate according to another embodiment of the present invention;
FIG. 7 is a graph of frequency response simulation of the same thickness vibration layer corresponding to different center distances of microstructures;
FIG. 8 is a graph of frequency response simulation of vibration layers of different thicknesses according to the present invention.
The reference numerals are:
1. sound-emitting layer, 11, first electrode, 111, first conductive layer, 112, first edge wire, 12, microstructure, 13, second electrode, 131, second conductive layer, 132, second edge wire, 14, insulating layer, 141, first insulating layer, 142, second insulating layer, 2, display layer, 21, luminescent layer, 22, substrate, 3, bottom plate, 4, polarizer, 5, protective layer, 6, central point.
The specific embodiment is as follows:
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.
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, the directional sounding of the screen is realized, and the directional display device can be applied to various display fields.
As shown in fig. 1, the directional display device disclosed in the embodiment of the invention includes a display screen and a sounding layer 1, wherein the display screen includes a display layer 2 and an integrally conductive bottom plate 3, the sounding layer 1 is interposed between the display layer 2 and the bottom plate 3, that is, all layers above the bottom plate 3 (including the display layer 2 and the sounding layer 1) are integrally used as an acoustic sounding layer except the bottom plate 3, the bottom plate 3 is used as an acoustic base layer, and in an embodiment, the bottom plate 3 may be an SUS stainless steel plate, and the thickness may be 150um. The directional display device can realize that the display screen can display and simultaneously can directionally sound.
Specifically, the display layer 2 is disposed outside the chassis 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 chassis 3. In implementation, the display screen can be an OLED display screen, an LED display screen or an LCD display screen, and when the display screen is an OLED display screen, the light-emitting layer 21 can be an OLED light-emitting layer, and the thickness of the light-emitting layer can be 40um; the substrate 22 may be a polyimide PI substrate, and may be 50um thick.
In practice, the sound-emitting layer 1 may be interposed between the light-emitting layer 21 and the substrate 22 as shown in fig. 3, or between the substrate 22 and the base plate 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 at an edge of the first conductive layer 111 away from the lower surface of the client, the second edge trace 132 is disposed at an edge of the second conductive layer 131 near 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 be directly a conductive substrate 3, as shown in fig. 4, that is, the substrate 3 is directly used as the second conductive layer 131, and the second edge trace 132 is disposed at an edge of the substrate 3 away from the lower surface of the client, where the substrate 3 and the second edge trace 132 form the second electrode 11. Of course, the second conductive layer 131 may be disposed on the upper surface of the base plate 3 near the client as shown in fig. 2. However, in the embodiment shown in fig. 2, since the substrate 3, which is not surface-treated, is itself entirely conductive, the sheet resistance of the second conductive layer 131 on the substrate 3 may be milliohm-scale. The lower the sheet resistance of the conducting layer is, the more beneficial to the improvement of the overall sound pressure level of the product, so the scheme of taking the bottom plate 3 as the second electrode 11 or a part of the second electrode 11 can effectively improve the overall sound production efficiency of the product. In addition, due to the light transmission requirement 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 (metalmesh), 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 due to the light transmittance requirement, but the second conductive layer 131 may be milliohm-scale due to the self-conductivity of the base plate 3.
Preferably, an insulating layer 14 for insulating the first electrode 11 and the second electrode 13 is further disposed between the first electrode 11 and the second electrode 13, and the insulating layer 14 may have various structures, for example, a first insulating layer 141 may be formed to cover the first conductive layer 111 and the first edge trace 112 entirely under the first conductive layer 111 and the first edge trace 112, a second insulating layer 142 may be formed to cover the second conductive layer 131 and the second edge trace 132 entirely over the second conductive layer 131 and the second edge trace 132, or a second insulating layer 142 may be formed to cover the first conductive layer 111 and the first edge trace 112 entirely under the first conductive layer 111 and the first edge trace 112, or a second insulating layer 142 may be formed to cover the second conductive layer 131 and the second edge trace 132 entirely under the second conductive layer 131 and the second edge trace 132. For example, a first frame insulating layer (not shown) covering the first edge wire 112 may be formed under the first edge wire 112, and a second insulating layer 142 covering the second conductive layer 131 and the second edge wire 132 may be formed over the second conductive layer 131 and the second edge wire 132, or a second middle insulating layer (not shown) covering only the second conductive layer 131 may be formed over the second conductive layer 131; conversely, a second frame insulating layer (not shown) covering the second edge wire 132 may be formed above the second edge wire 132, and a first insulating layer 141 covering the first conductive layer 111 and the first edge wire 112 may be formed below the first conductive layer 111 and the first edge wire 112, or a first middle insulating layer (not shown) covering only the first conductive layer 111 may be formed below the first conductive layer 111. Of course, other insulating layer 14 structures that can achieve insulation between the first electrode 11 and the second electrode 13 are also applicable to the present invention, as long as the insulating layer 14 meets the breakdown voltage of 400V or more in the finished product test, and the thickness can be changed according to the material change, that is, the method is not limited to the several modes listed herein.
The microstructure 12 may optionally be disposed below the first insulating layer 141 or on the second insulating layer 142, preferably on the second insulating layer 142, so that the thickness of the entire vibration layer may be reduced, thereby increasing the overall sound pressure level of the product. In practice, the microstructure 12 may have various shapes, such as a cylinder, a prism, a cube, and the like, and the corresponding cross-sectional shapes are respectively circular, triangular, and square. In addition, in theory, the smaller the size of the microstructure, the higher the overall transmittance of the final product, and the lower the probability of rainbow and mole marks generated by the product, the size of the microstructure 12 can be set to 1cm or less, preferably 600um or less, and generally 50um to 100um is selected. The height of the microstructures 12 may be set to 2um to 1mm, preferably 10um to 17um. And theoretically, the smaller the center-to-center distance between the microstructures 12, the higher the resonant frequency of the product, but the lower the overall transmittance of the product; on the contrary, the larger the distance between the center distances of the microstructures 12, the lower the resonant frequency of the product, but the higher the overall transmittance of the product, so that the corresponding center distance is selected to meet the requirement of high resonant frequency of the product, and the product can reach high product transmittance. Through experiments, the center distance between two adjacent microstructures 12 can be set to be 10um-2cm, preferably 0.1mm-10mm, and particularly 1.1mm center distance can be adopted, so that the product resonant frequency can be high and high product transmittance can be ensured. In practice, the microstructures 12 may be selected from a high light transmittance dry film material, or a clear ink of polyester, polyurethane, or the like. An air gap required for the vibration of the vibration layer is formed between the first electrode 11 and the second electrode 13 by the micro structure 12.
In addition, the vibration layers of different thicknesses are fitted with microstructures 12 of different shapes, and specifically, the thickness of the vibration layer may be set to 50um to 1mm. Vibration layers with different thicknesses need to be matched with different center distance patterns of the microstructure 12, and efficiency can reach the maximum under a certain working voltage. As shown in fig. 7, frequency response acoustic simulation diagrams of vibration layers with a thickness of 100um and different center distances are shown. As can be seen from the figure, the smaller the center-to-center distance between the microstructures 12, the higher the resonant frequency of the product and the higher the sound pressure level; as shown in fig. 8, frequency response acoustic simulations corresponding to vibration layers of different thicknesses are shown. As can be seen from fig. 8, the thickness of the vibration layer as a whole is reduced, and the higher the resonance frequency of the product, the greater the sound pressure level. Of course, the shape of the microstructure 12, the thickness of the vibration layer, etc. are not limited to those defined herein, and other microstructures 12, vibration layers, etc. having a size, height, etc. that meets the acoustic simulation requirements are also applicable to the present invention.
The microstructures 12 may also be arranged to form a plurality of array elements (not shown) arranged in an array, each of which may be regular hexagons or squares or other regular or irregular shapes.
Preferably, as shown in fig. 5, a center point 6 may be added to the center portion of each array unit, so as to effectively improve the reliability of the product in the working state. In practice, the height of the center point 6 may be set to be less than half the height of the edge microstructure, e.g., 10um to 17um, and then the height of the center point 6 may be set to be 5um to 8um. Is generally designed to be optimally 5-8 um. Because of the process technology and material limitation, the silk-screen printing process and the exposure developing process are easier to realize the central point height of 5um to 8um: 5um to 8um of silk screen printing, the viscosity of the printing ink can be adjusted, and the printing ink can be matched with the screen printing plate material; the dry film developing process can be realized by selecting a transparent dry film with the thickness of 5-8 um as a raw material and matching with a film pressing exposure developing process.
Preferably, the display screen may further include a protective layer 5, where the protective layer 5 may be implemented using a polyimide (CPI) protective film, or a protective film made of another material, and the protective film may have a thickness of 10um to 80um, and several preferred thickness values commonly used are 12um, 25um, 30um, 50um, and 80um, respectively. And when in implementation, the CPI protective film can be single-layer or multi-layer, and when in multi-layer, the CPI protective films are fully attached.
In another embodiment, the display screen may further include a Polarizer (POL) 4, where the polarizer 4 is generally located below the protective layer 5 (i.e., near the side of the display layer 2), or may be integrally provided with the protective layer 5. In practice, the thickness of the polarizer 4 is generally more than 50um, and several preferred thicknesses are generally 50um, 70um and 80um respectively; when integrally provided with the protective layer 5, the thickness is typically 80um. In addition, below the polarizer 4 is the display layer 2, or in other embodiments, below the polarizer 4 is an optical compensation film (Cop, not shown), below which is the display layer 2, 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, for example, 30um may be used.
As shown in fig. 3, when the sounding 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 near the client side, and the second conductive layer 131 is disposed above the substrate near the display layer, and at this time, the laminated layer above the light emitting layer 21 (including the protective layer 5 and the polarizer 4), the laminated layer above the light emitting layer 21 and the first electrode 11 or above the light emitting layer 21, the first electrode 11 and the first insulating layer 141 form a vibration layer of the sounding layer 1, and other structures except the vibration layer form 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 base plate 3, the first conductive layer 111 is disposed below the substrate, the second conductive layer 131 is disposed above the base plate, and at this time, the laminated layer above the light emitting layer 21 (including the protective layer 5 and the polarizer 4), the laminated layer above the light emitting layer 21, the substrate 22 and the first electrode 11 or above the light emitting layer 21, the substrate 22, the first electrode 11 and the first insulating layer 141 form a vibration layer of the sounding layer 1, and other structures except the vibration layer form a base of the directional display device.
According to the invention, the tightness of the acoustic sounding layer needs to be ensured before the acoustic sounding layer and the acoustic base layer are subjected to frame pasting, in an embodiment, the acoustic sounding layer is ensured to be fully aged before the frame pasting, the size cannot be expanded and contracted at a high temperature (generally 150 ℃), then a tensioning jig or a tensioning pasting machine is adopted to ensure that a certain tensioning progress of the acoustic sounding layer is pasted with the acoustic base layer, four sides of the acoustic sounding layer are solidified under AB glue or silica gel reheating or UV illumination conditions after pasting, and a tensioning mechanism is not removed all the time in the solidification process. In another embodiment, the acoustic sounding layer is kept in a material expansion and contraction space before frame pasting, no tensioning mechanism such as a jig and a machine table is adopted, the acoustic base layer and the acoustic sounding layer on the upper layer are frame-pasted, AB glue or silica gel is adopted for four sides of the acoustic sounding layer to be solidified under heating or UV illumination conditions, solidification temperature and time are consistent with the expansion and contraction node temperature and time of the acoustic sounding layer, for example, in one embodiment, an optical grade PET film material with the Transverse (TD) direction and the longitudinal (MD) direction being less than 1% is aged at 150 degrees, aging time is 1h, AB glue or silica gel solidified under 150 degrees is adopted, and the thermal contraction temperature is not lower than 150 degrees and time is not lower than 1h.
The invention also discloses an electronic device which comprises the directional display device, such as a computer, a television, a tablet and other electronic equipment needing a display device, namely the invention can be applied to various display fields, can realize directional sounding while realizing display, and has better privacy.
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 layers of the display screen except the bottom plate are taken as the acoustic sounding layer, and the bottom plate is taken as the acoustic base layer, so that the bottom plate can be directly taken as one electrode of the sounding layer, or the conducting layer arranged on the surface of the bottom plate can achieve milliohm level, and the whole sounding efficiency of the sounding layer can be effectively improved. 3. According to the invention, through matching the vibrating layers with different thicknesses with microstructures with different shapes and different distribution structures and matching with corresponding parameter setting and preparation processes, the overall transmittance of a finished product is high, the probability of rainbow lines and moire lines is low, and the sound pressure level of 1KHz audible sound can reach 70-80 db. 4. The middle point is additionally arranged in the middle of the sounding unit, so that the reliability of the finished product in a working state can be improved.
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 (15)
1. The directional display device is characterized by comprising a display screen and a sounding layer, wherein the display screen comprises a display layer and a bottom plate which is integrally conductive, the display layer is arranged on the outer side of the bottom plate and is 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 vibrating layer of the sounding layer, and an air gap required by vibration of the vibrating layer is formed between the first electrode and the second electrode under the action of the microstructure; the bottom plate is directly used as the second electrode or used as a part of the second electrode, vibrating layers with different thicknesses are matched with microstructures with different shapes, the thickness of the vibrating layers is 50 um-1 mm, the size of each microstructure is less than 1cm, the height is 2 um-1 mm, and the center distance between every two adjacent microstructures is 10um-2 cm.
2. A directional display device as recited in 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 luminescent layer, the sound emitting layer being disposed between the luminescent layer and the backplane.
4. A directional display device as recited in claim 1, wherein the display layer comprises a light emitting layer and a substrate, the sound emitting layer being disposed between the light emitting layer and the substrate or the sound emitting layer being disposed between the substrate and the 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. The directional display device of claim 5, wherein the display screen further comprises a polarizer disposed between the protective layer and the display layer or disposed between the protective layer and the display layer and integral with the protective layer.
7. A directional display device as claimed in any one of claims 1 to 6 wherein the first electrode comprises a first conductive layer and a first edge track, the second electrode comprises a second conductive layer and a second edge track, the first edge track is disposed at an edge of the first conductive layer away from a lower surface of the client, the second edge track is disposed at an edge of the second conductive layer adjacent to an 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 substrate or is disposed between the substrate and the first electrode.
9. A directional display device according to claim 7, wherein the first and second conductive layers are indium tin oxide and/or nano silver, or metal mesh, or a composite structure of metal mesh and indium tin oxide or nano silver.
10. The directional display device of claim 1, wherein the sound emitting layer further comprises an insulating layer for insulating, the insulating layer being disposed between the first electrode and the second electrode.
11. The directional display device of claim 8, wherein the second conductive layer has a sheet resistance in milliohms when the substrate is positioned near the top surface of the client.
12. A directional display device according to claim 1, wherein the microstructure arrangement forms a plurality of array elements arranged in an array, each array element being regular hexagonal or square or other regular or irregular shape.
13. A directional display device according to claim 12, wherein the central portion of each array element is provided with a central point having a height less than half the height of the edge microstructure.
14. The directional display device according to claim 6, wherein the protective layer is a polyimide protective film, the microstructure is made of a dry film material or transparent ink, and the transparent ink is polyester or polyurethane transparent ink.
15. An electronic device comprising an orientation display device according to any one of claims 1 to 14.
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| CN115550818B (en) * | 2022-10-17 | 2023-12-08 | 苏州清听声学科技有限公司 | Foldable directional sounding device, display device and preparation process |
| CN115567835B (en) * | 2022-10-17 | 2024-02-02 | 苏州清听声学科技有限公司 | Foldable directional sounding device, display device and preparation process |
| CN115802249B (en) * | 2022-10-17 | 2023-12-29 | 苏州清听声学科技有限公司 | Foldable directional display device and preparation process |
| CN115942219B (en) * | 2022-10-17 | 2023-12-08 | 苏州清听声学科技有限公司 | Foldable directional sounding device, display device and preparation process |
| CN115767401B (en) * | 2022-10-17 | 2023-12-08 | 苏州清听声学科技有限公司 | Foldable directional sounding device, display device and preparation process |
| CN116156399A (en) * | 2023-01-03 | 2023-05-23 | 合肥京东方光电科技有限公司 | Directional sound emitting component, its manufacturing method and display device |
| CN118678282B (en) * | 2024-06-03 | 2025-02-11 | 苏州清听声学科技有限公司 | A low-polarization directional sound-emitting screen and its preparation process |
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