CN116030726B

CN116030726B - Frame-free display directional sound-emitting screen and tensioning and attaching process thereof

Info

Publication number: CN116030726B
Application number: CN202310315602.5A
Authority: CN
Inventors: 胡亚云; 毛峻伟; 匡正
Original assignee: Suzhou Hear Acoustic Technology Ltd
Current assignee: Suzhou Hear Acoustic Technology Ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-07-25
Anticipated expiration: 2043-03-29
Also published as: CN116030726A

Abstract

The invention discloses a frame-free display directional sound-emitting screen and a tensioning and attaching process thereof, wherein the directional sound-emitting screen comprises a base material, the base material comprises an upper surface and a plurality of side surfaces, the side surfaces are positioned around the upper surface, the surface where the side surfaces are positioned and the surface where the upper surface is positioned are not on the same plane, the upper surface and the side surfaces are respectively provided with a first transparent conductive layer, and at least one side surface is provided with an edge wiring for enhancing the conductivity of the first transparent conductive layer. The edge wirings for enhancing the conductivity of the display layer are arranged on the side surface of the display layer, so that the visual area of the display layer is not affected, the display area is increased under the same display size, the display area is maximized, and the borderless display of the directional sound emitting screen is realized.

Description

Frame-free display directional sound-emitting screen and tensioning and attaching process thereof

Technical Field

The invention relates to the technical field of directional sounding and display screens, in particular to a borderless display directional sounding screen and a tensioning and attaching process thereof.

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.

The touch panel can recognize a touch point inputted through a human hand or a separate input unit and transmit information corresponding thereto to an upper display device. Touch panels are classified into resistive, capacitive, and infrared sensing types according to a touch sensing method of the touch panel. A capacitive touch panel is widely focused at present because a manufacturing method is easy and a sensing force is strong.

The prior art has the research of combining screen directional sounding and touch control functions, so that a display can integrate screen directional sounding, display, touch control and other functions into a whole, and the two functions are not interfered with each other. However, a typical display device has an outer frame with a certain width, and the outer frame covers the periphery of the display, so that the display device has a visual perception of reduced display area in appearance.

Therefore, how to research a directional sounding display device that can realize the functions of directional sounding, display and touch control, and simultaneously, can meet the requirement of increasing the display area under the same display size is a problem to be solved.

Disclosure of Invention

The invention aims to provide a frame-free display directional sound-emitting screen and a tensioning and attaching process thereof.

To achieve the above object, in one aspect, the present invention provides a borderless display directional sound-emitting screen, including: the base material, the base material includes upper surface and a plurality of side, a plurality of sides are located the periphery of upper surface, and the face at place with the face at upper surface place is not on the coplanar, the upper surface with all be provided with first transparent conductive layer on a plurality of sides, and at least one set up on the side be used for strengthening first transparent conductive layer electrically conductive edge walks the line.

In a preferred embodiment, the directional sound-emitting screen further comprises a vibrating diaphragm and a microstructure, wherein the vibrating diaphragm is attached to the upper surface of the base material, a second transparent conductive layer is arranged on the surface, close to the base material, of the vibrating diaphragm, and the microstructure is arranged between the vibrating diaphragm and the base material and is used for providing an air gap required by vibration of the vibrating diaphragm.

In a preferred embodiment, the directional sound-emitting screen further comprises an insulating layer for isolating the diaphragm from the substrate, the insulating layer being disposed between the first transparent conductive layer and the second transparent conductive layer.

In a preferred embodiment, the substrate has one or more sections, and the contact areas of two adjacent sections are isolated by insulation, and the edge track is provided on at least one side of each section.

In a preferred embodiment, the edge traces bind a flexible circuit board with the flexible flat wires folded back onto a lower surface opposite the upper surface of the substrate.

In a preferred embodiment, the extending direction of the edge trace is the same as the extending direction of the side face, and one edge of the edge trace is close to or distributed along the side face close to the edge of the upper surface of the substrate.

In a preferred embodiment, the first transparent conductive layer is firstly formed on one surface of the insulating layer, which is close to the substrate, and then the insulating layer is fully attached to the upper surface of the substrate; or, during manufacturing, the first transparent conductive layer is firstly manufactured on the base material, and then the insulating layer is coated on the first transparent conductive layer.

On the other hand, the invention provides a tensioning and attaching process of a frame-free display directional sound-emitting screen, which comprises the following steps:

s1, tensioning the vibrating diaphragm, and fully attaching one surface of the vibrating diaphragm far away from the second transparent conductive layer to a carrier, wherein the vibrating diaphragm further comprises attaching parts positioned at the periphery of the second transparent conductive layer;

s2, keeping tension on the vibrating diaphragm, attaching the second transparent conductive layer of the vibrating diaphragm to the upper surface of the base material, and correspondingly attaching the attaching part of the vibrating diaphragm to the side surface of the base material;

s3, removing the carrier.

In a preferred embodiment, in S2, the attaching process of the attaching portion of the diaphragm and the side surface of the substrate includes:

s21, attaching a first colloid to the side surface of the base material, reversely folding the attaching part of the vibrating diaphragm, and primarily attaching the vibrating diaphragm to the side surface of the base material through the first colloid;

s22, filling a second colloid between the side surface of the base material and the attaching part of the vibrating diaphragm, and curing the second colloid;

and in the S21 and S22 processes, the vibrating diaphragm is kept to be tensioned.

In a preferred embodiment, in S1, a surface of the diaphragm away from the second transparent conductive layer is fully adhered to the carrier by UV-reducing adhesive, and in S3, the carrier is removed by UV irradiation.

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

1. the edge wirings for enhancing the conductivity of the display layer are arranged on the side surface of the display layer, so that the visual area of the display layer is not affected, the display area is increased under the same display size, the display area is maximized, and the borderless display of the directional sound emitting screen is realized.

2. According to the invention, the display screen is set to be displayed without a frame in one partition or a plurality of partitions, so that single-channel or multi-channel sounding of the display screen is realized, and the diversified requirements of users are met.

3. According to the invention, the vibrating diaphragm and the base material are fully attached by adopting a tensioning process and matching with the carrier, so that the reliability and the sound pressure level of the formed display screen are improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a directional display screen of the present invention;

FIG. 2 is a schematic diagram of a substrate (with only one partition) according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a substrate (with two partitions) according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a diaphragm according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of the tensioning and attaching process of the present invention.

The reference numerals are:

1. the device comprises a base material, 11, an upper surface, 12, a side surface, 2, a microstructure, 3, a vibrating diaphragm, 31, a main body part, 32, a bonding part, 4, a first transparent conductive layer, 5, an edge wiring, 6, an insulating area, 7, a second transparent conductive layer, 8 and an insulating layer.

Detailed Description

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

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

As shown in fig. 1, a borderless display directional sound-emitting screen of the present invention includes a substrate 1, a microstructure 2, and a diaphragm 3, where, in conjunction with fig. 2, the substrate 1 includes an upper surface 11 and a plurality of side surfaces 12, and the plurality of side surfaces 12 are located around the upper surface 11 and not in the same plane as the upper surface 11. In this embodiment, the substrate 1 may be flat cuboid glass, so that the upper surface 11 is rectangular, and four sides 12 (i.e. left side, right side, front end and rear end) perpendicular to the upper surface 11 are provided around the upper surface 11. The size of the upper surface 11 and the thickness of the substrate 1 may be set according to practical requirements, which is not limited in the present invention, and theoretically, the thinner the thickness of the substrate 1, the better, and the overall shape of the substrate 1 is not limited to the cuboid defined herein.

The first transparent conductive layer 4 is disposed on the upper surface 11 and the side surface 12 of the substrate 1, and when the first transparent conductive layer 4 is implemented, an ITO (indium tin oxide) layer may be specifically used.

At least one side 12 of the substrate 1 is provided with edge tracks 5 for enhancing the conductivity of the side first transparent conductive layer 4. For example, the edge wiring 5 may be provided only on any one side surface of the substrate 1, or the edge wiring 5 may be provided on both left and right side surfaces of the substrate 1, the front and rear side surfaces may not be provided, or four side surfaces may be provided.

The substrate 1 may have one or more zones, where the display screen formed is full-face sounding and the sound emitted is mono-channel. In combination with fig. 3, when a plurality of partitions are shown, the contact area portions of two adjacent partitions are insulated and isolated, and when the method is implemented, the first transparent conductive layer 4 of the contact area can be etched away to form an insulating area 6, for example, when two partitions are distributed on the left and right sides of the substrate 1, the first transparent conductive layer 4 is etched away in the middle area of the substrate 1, so that the substrate 1 is divided into left and right partitions, and sound channels emitted by the two partitions can be the same or different, for example, left sound channels or right sound channels can be emitted respectively.

When the substrate 1 is divided into a plurality of partitions, the edge trace 5 is provided on at least one side of each partition. For example, an edge wire 5 is respectively disposed on the left side surface of the left partition and the right side surface of the right partition. In one embodiment, if two channels are adopted, i.e. the substrate 1 is divided left and right, the first transparent conductive layer 4 is etched away in the middle of the substrate 1, so that the first transparent conductive layers 4 of the left and right divisions are not connected, and the edge wires 5 are not connected. An edge wire 5 is respectively arranged on the left side surface and the right side surface of the left and right subareas, the left edge wire 5 controls a left sound channel, and the right edge wire 5 controls a right sound channel.

Preferably, the edge tracks 5 extend in the same direction as the side on which they are located, and have one side that is located close to or along the edge of the side that is close to the upper surface 11 of the substrate 1, and the other side that is also located as close to or along the edge of the side that is close to the lower surface of the substrate 1 as possible. That is, if the length extending direction of the side surface is the front-back direction, the edge traces 5 are also extended and distributed along the front-back direction, and the edges of the upper and lower sides of the edge traces are also respectively close to or distributed along the upper and lower sides of the side surface, so that the surface area of the side surface can be fully utilized, and the conductivity of the edge traces 5 can be enhanced as much as possible.

In addition, it is preferable that the lower the line resistance of the edge wiring 5 is, the lower the line resistance is, the higher the sound emission efficiency of the formed display screen is, and the lower the power consumed on the screen is, for example, the line resistance is kept below 3Ω. In the design, the length of the edge wire 5 can be designed according to the heating power of the screen, for example, the length of the edge wire 5 is 10cm, and the width is 1.5mm, namely 10cm multiplied by 1.5mm. In a specific embodiment, the load power is 4W, the resolution is 1K, the sound production decibel is 72db, the lateral edge wire 5 can be specifically designed to be a silver paste wire of 10cm×1.5mm, or can be designed to be a copper wire of 10cm×1.5mm, and the resistance of the silver paste wire or the copper wire is kept below 3Ω. Other doped metals may also be used for the edge tracks 5.

The edge wire 5 can be bound with a flexible circuit board (not shown), and the flexible flat cable of the flexible circuit board can be folded back on the lower surface opposite to the upper surface of the base material 1, and can also be folded back on the back of the whole display module.

During processing, the edge routing 5 can be realized by adopting a silk screen printing silver paste process of a silk screen printing machine, can also be realized by adopting a copper plating process, and can also be realized by adopting a silk screen printing conductive ink of a three-dimensional roller type silk screen printing machine. And the processing technology of the edge wires 5 on different sides can be the same or different, for example, one side is realized by adopting silk-screen silver paste, the other side is realized by adopting copper plating, and the same is generally preferred, so that the processing cost can be saved.

The microstructure 2 is arranged between the substrate 1 and the diaphragm 3 for providing an air gap required for the diaphragm 3 to vibrate. In practice, the first transparent conductive layer 4 of the substrate 1 may be specifically disposed, or the diaphragm 3 may be disposed on the lower surface close to the substrate 1.

The vibrating diaphragm 3 is attached to the upper surface of the substrate 1, and a second transparent conductive layer 7 is arranged on the surface, close to the substrate 1, of the vibrating diaphragm 3. In a specific embodiment, the diaphragm 3 is designed into a special-shaped structure, as shown in fig. 4, and includes a main body 31 and a bonding portion 32 around the main body 31, where the main body 31 is the same as the upper surface 11 of the substrate 1, that is, completely coincides with the upper surface 11 of the substrate 1, and an air gap is formed between the main body 31 and the upper surface 11 of the substrate 1 after the diaphragm 3 is bonded to the substrate 1 due to the microstructure 2, and in this embodiment, the second transparent conductive layer 7 is formed on the lower surface of the main body 31 near the substrate 1. The four attaching portions 32 are formed by extending four sides of the main body 31 outward, and are used for attaching and fixing the diaphragm 3 to the substrate 1, and each attaching portion 32 is attached to a corresponding side surface of the substrate 1, and may be sized according to the side surface 12 of the substrate 1, preferably, all the corresponding side surface 12 of the substrate 1 is covered. In addition, in this embodiment, the inner surface of at least one bonding portion 32 near the corresponding side 12 is provided with the edge trace 5, and of course, four bonding portions 32 may be provided with the edge trace 5, and each edge trace 5 is preferably provided according to the above expression, that is, the extending direction of the edge trace 5 is the same as the extending direction of the side where it is located, and one edge thereof is distributed near or along the edge where the side is near the upper surface of the substrate 1. In practice, the diaphragm 3 may be made of a polymer material such as PI (polyimide) material or PET (polyethylene terephthalate) material. Non-transparent materials such as aluminum film or copper film may be used without considering the transparency requirement. In a specific embodiment, the diaphragm 3 may alternatively be UTG (Ultra-Thin Glass) such as a diaphragm formed by laminating a CPI (transparent polyimide) protective layer and an Ultra-Thin CG (Cover Glass) protective layer. The lower the sheet resistances of the first transparent conductive layer 4 and the second transparent conductive layer 7 are, the more favorable for improving the sounding efficiency and reducing the power consumption.

In addition, an insulating layer 8 is further disposed between the diaphragm 3 and the substrate 1, and in operation, the insulating layer 8 is disposed between the first transparent conductive layer 4 and the second transparent conductive layer 7, and in a specific embodiment, the insulating layer 8 is disposed on the first transparent conductive layer 4 of the substrate 1. The material is preferably an optical grade material with a thickness of less than 12um, such as PI (polyimide) material, or PET (polyethylene terephthalate) base film, or conventional silk screen ink, or transparent CPI (transparent polyimide) stock solution. The smaller the shrinkage of the material is, the more beneficial to avoiding the problems of internal shrinkage, external expansion, reduced withstand voltage value and the like caused by swelling and water absorption in the later period of the material.

In one embodiment, during the manufacturing, the first transparent conductive layer 4 can be firstly formed on one surface of the insulating layer 8 close to the substrate 1, and then the insulating layer 8 is fully attached to the upper surface 11 of the substrate 1, so that the process is mature, the overall thickness tolerance of the substrate 1 can be reduced, the optical grade can be achieved, and the breakdown resistance of the finished product is better; alternatively, in another embodiment, the first transparent conductive layer 4 is first formed on the substrate 1, and then the insulating layer 8 is coated on the first transparent conductive layer 4. In this way, the insulating layer 8 may be coated on the surface of the substrate 1 by coating or exposing and developing, and the insulating layer 8 may be coated on the first transparent conductive layer 4 by using silk screen ink, transparent dry film, or transparent CPI stock solution, preferably a material with high dielectric strength, such as CPI stock solution.

As shown in fig. 5, the invention further discloses a tensioning and attaching process of the borderless display directional sound-emitting screen, which specifically comprises the following steps:

s1, tensioning the vibrating diaphragm 3, and fully attaching one surface of the vibrating diaphragm, which is far away from the second transparent conductive layer 7, to the carrier, wherein the vibrating diaphragm 3 further comprises attaching parts positioned around the second transparent conductive layer 7.

Specifically, when the method is implemented, for example, by fully attaching the surface of the diaphragm 3 away from the second transparent conductive layer 7 to the carrier, since the carrier is made of a hard material, the diaphragm 3 can be kept in a tensioned state after being attached thereto. The diaphragm 3 may specifically adopt the diaphragm with the special-shaped structure in the foregoing embodiment, and four attaching portions 32 are disposed around the main body portion 31 of the diaphragm, where the main body portion 31 is attached to the carrier, and the attaching portions 32 are used to attach to the side surface of the substrate 1. In implementation, the vibrating diaphragm 3 and the carrier can be bonded by adopting UV (ultraviolet) glue reducing adhesive.

S2, the vibrating diaphragm 3 is kept in tension, the second transparent conductive layer 7 of the vibrating diaphragm 3 is bonded with the upper surface 11 of the base material, and the bonding part 32 of the vibrating diaphragm is correspondingly bonded with the side surface of the base material 1.

Specifically, the vibrating diaphragm 3 is kept under tension, the second transparent conductive layer 7 of the main body 31 is overlapped with the upper surface 11 of the substrate, the side 12 of the substrate 1 is attached with a first adhesive, such as double-sided adhesive, and then the attaching portions 32 of the vibrating diaphragm 3 are respectively folded and attached to the four sides of the substrate 1, and primary attachment of the vibrating diaphragm 3 and the substrate 1 is realized through the first adhesive on the side of the substrate. A second glue, which may be a UV solid glue, may then be filled between the attachment portion 32 and the side of the substrate 1. After filling, the second colloid is cured by UV curing or directly by heat curing. In the whole step S2, the diaphragm 3 needs to be kept taut.

S3, removing the carrier.

Specifically, in a specific embodiment, since the UV-reducing adhesive is used between the carrier and the diaphragm 3 for fixing, the carrier can be removed by irradiating UV, which can ensure that the diaphragm 3 is not damaged while removing the carrier, and also can maintain the tension of the diaphragm 3.

The invention has the advantages that 1, the edge wirings for enhancing the conductivity of the display layer are arranged on the side surface of the display layer, the visual area of the display layer is not influenced, the display area is improved under the same display size, and the display area is maximized, thereby realizing the borderless display of the directional sound emitting screen. 2. According to the invention, the display screen is set to be displayed without a frame in one partition or a plurality of partitions, so that single-channel or multi-channel sounding of the display screen is realized, and the diversified requirements of users are met. 3. According to the invention, the vibrating diaphragm and the base material are fully attached by adopting a tensioning process and matching with the carrier, so that the reliability and the sound pressure level of the formed display screen are 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

1. A borderless display directional sound screen, the directional sound screen comprising:

the substrate comprises an upper surface and a plurality of side surfaces, wherein the side surfaces are positioned on the periphery of the upper surface, the surface where the side surfaces are positioned and the surface where the upper surface is positioned are not on the same plane, the upper surface and the side surfaces are provided with first transparent conductive layers, and at least one side surface is provided with edge wires for enhancing the conductivity of the first transparent conductive layers;

the extending direction of the edge wire is the same as the extending direction of the side surface where the edge wire is positioned, and one edge of the edge wire is close to or distributed along the edge of the side surface close to the upper surface of the substrate; the line resistance of the edge wiring is below 3 omega;

the directional sound-emitting screen further comprises a vibrating diaphragm, the vibrating diaphragm is attached to the upper surface of the base material, a second transparent conductive layer is arranged on the surface, close to the base material, of the vibrating diaphragm, the vibrating diaphragm comprises a main body portion and a peripheral attaching portion of the main body portion, the main body portion is completely overlapped with the upper surface of the base material, the second transparent conductive layer is formed on the lower surface, close to the base material, of the main body portion, the attaching portions are formed by extending outwards from four sides of the main body portion, each attaching portion is attached to the corresponding side edge of the base material, and at least one edge routing is arranged on the inner surface, close to the side surface, of the attaching portion.

2. The rimless display directional sound emitting screen of claim 1, further comprising microstructures disposed between the diaphragm and the substrate for providing an air gap for vibration of the diaphragm.

3. The rimless display directional sound emitting screen of claim 2, further comprising an insulating layer for isolating the diaphragm from the substrate, the insulating layer disposed between the first transparent conductive layer and the second transparent conductive layer.

4. A borderless display directional sound screen as defined in claim 3 wherein said substrate has one or more sections wherein contact areas of adjacent two sections are insulated apart when the sections are in a plurality of sections, at least one side of each section being provided with said edge track.

5. A borderless display directional sound screen of claim 3 wherein said edge traces are bound to a flexible circuit board, said flexible circuit board flexible flat cable being folded back onto a lower surface opposite said upper surface of said substrate.

6. A borderless display directional sound-emitting screen as claimed in claim 3 wherein said first transparent conductive layer is formed on a side of said insulating layer adjacent to said substrate and said insulating layer is fully bonded to said upper surface of said substrate; or, during manufacturing, the first transparent conductive layer is firstly manufactured on the base material, and then the insulating layer is coated on the first transparent conductive layer.

7. A tensioning and attaching process based on the borderless display directional sound-emitting screen as defined in any one of claims 2 to 6, comprising:

s1, tensioning the vibrating diaphragm, and fully attaching one surface of the vibrating diaphragm far away from the second transparent conductive layer to a carrier;

s3, removing the carrier.

8. The process of claim 7, wherein in S2, the process of attaching the attaching portion of the diaphragm to the side surface of the substrate includes:

9. The process for tensioning and attaching a borderless display directional sound-emitting screen as defined in claim 7, wherein in S1, a surface of said diaphragm away from said second transparent conductive layer is fully attached to a carrier by UV-reducing adhesive, and in S3, said carrier is removed by UV irradiation.