CN110187538B

CN110187538B - Display device

Info

Publication number: CN110187538B
Application number: CN201910480373.6A
Authority: CN
Inventors: 周永祥
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2022-02-22
Anticipated expiration: 2039-06-04
Also published as: CN110187538A

Abstract

The invention provides a display device, which comprises a display module, a sounding layer and a connecting terminal, wherein the display module comprises a driving circuit used for providing an external driving signal; the sounding layer is arranged in the display module and comprises an exciter, and the exciter comprises a first electrode layer, a first piezoelectric material layer and a second electrode layer which are arranged in a stacked mode in the light emergent direction of the display module; the connecting terminal is connected with the driving circuit and the exciter and is used for transmitting an external driving signal to the exciter so as to drive the exciter to vibrate and sound; wherein the actuator includes a first vibration region and a second vibration region, and a thickness of the first piezoelectric material layer in the first vibration region is smaller than a thickness in the second vibration region. By setting the thickness of the first piezoelectric material layer in the exciter to be smaller in the first vibration area than in the second vibration area, the exciter can generate low-frequency sound in the first vibration area and high-frequency sound in the second vibration area, and the sound production effect of the exciter is better.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

With the continuous development of the technology, in order to improve the screen occupation ratio of electronic products, a receiver at the top of an electronic element is cancelled, and a mode of an exciter is adopted to enable the screen to sound. However, the existing exciters have poor sounding effect and cannot meet the requirement of sound.

Therefore, the existing display device has the technical problem of poor sound production effect, and needs to be improved.

Disclosure of Invention

The invention provides a display device, which aims to solve the technical problem that the existing display device is poor in sound production effect.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the present invention provides a display device including:

the display module comprises a driving circuit and a control circuit, wherein the driving circuit is used for providing an external driving signal;

the sounding layer is arranged inside the display module and comprises an exciter, and the exciter comprises a first electrode layer, a first piezoelectric material layer and a second electrode layer which are arranged in a stacked mode in the light emergent direction of the display module;

the connecting terminal is connected with the driving circuit and the exciter and is used for transmitting an external driving signal to the exciter so as to drive the exciter to vibrate and sound;

wherein the actuator includes a first vibration region and a second vibration region, and a thickness of the first piezoelectric material layer in the first vibration region is smaller than a thickness in the second vibration region.

In the display device of the present invention, the actuator includes at least one of the first vibration regions and at least one of the second vibration regions, and the first vibration regions and the second vibration regions are alternately arranged.

In the display device of the present invention, at least one of the first vibration region and the second vibration region further includes at least one second piezoelectric material layer and at least one third electrode layer corresponding to the second piezoelectric material layer on a side of the second electrode layer away from the first piezoelectric material layer, and the second piezoelectric material layer and the third electrode layer are alternately stacked.

In the display device of the present invention, the second piezoelectric material layer and the third electrode layer are provided in both the first vibration region and the second vibration region, and the number of the second piezoelectric material layers in each region is equal.

In the display device of the present invention, the first electrode layer includes a first sub-electrode layer and a second sub-electrode layer that are not in contact with each other, the first sub-electrode layer is located in the first vibration region, and the second sub-electrode layer is located in the second vibration region.

In the display device of the invention, a first insulating layer and a second insulating layer which are not in contact with each other are further arranged on one side of the first electrode layer, which is far away from the first piezoelectric material layer, and the first insulating layer and the second insulating layer are arranged on the same layer and are respectively positioned at two ends of the first electrode layer.

In the display device of the present invention, the sound generation layer includes at least two drivers, and a first sound insulation portion is provided between the neighboring drivers.

In the display device of the present invention, the display device further includes a flat layer provided on one side of the sound emission layer, and a second sound insulation portion is further provided between the flat layer and the sound emission layer.

In the display device, the display module is a liquid crystal display module, the liquid crystal display module comprises an array substrate and a color film substrate which are arranged in a box-to-box manner, a liquid crystal layer filled between the array substrate and the color film substrate, a first polarizer arranged on one side of the array substrate far away from the color film substrate, and a second polarizer arranged on one side of the color film substrate far away from the array substrate, and the sound production layer is arranged in the direction of the array substrate far away from the polarizers.

In the display device, the display module is an OLED display module, the OLED display module includes a substrate, a driving circuit layer, a pixel defining layer, a light emitting layer and an encapsulation layer, and the sound emitting layer is disposed in a direction in which the light emitting layer is far away from the pixel defining layer.

The invention has the beneficial effects that: the invention provides a display device, which comprises a display module, a sounding layer and a connecting terminal, wherein the display module comprises a driving circuit used for providing an external driving signal; the sounding layer is arranged inside the display module and comprises an exciter, and the exciter comprises a first electrode layer, a first piezoelectric material layer and a second electrode layer which are arranged in a stacked mode in the light emergent direction of the display module; the connecting terminal is connected with the driving circuit and the exciter and is used for transmitting an external driving signal to the exciter so as to drive the exciter to vibrate and sound; wherein the actuator includes a first vibration region and a second vibration region, and a thickness of the first piezoelectric material layer in the first vibration region is smaller than a thickness in the second vibration region. By setting the thickness of the first piezoelectric material layer in the exciter to be smaller in the first vibration area than in the second vibration area, the exciter can generate low-frequency sound in the first vibration area and high-frequency sound in the second vibration area, and the sound production effect of the exciter is better.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 2 is a schematic plan view of a sound generation layer in a display device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a first structure of an actuator in a display device according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating a second structure of an actuator in a display device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a third structure of an actuator in a display device according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a fourth structure of an actuator in a display device according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a fifth structure of an actuator in a display device according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a sixth structure of an actuator in a display device according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a seventh structure of an actuator in a display device according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a seventh structure of an actuator in a display device according to an embodiment of the present invention;

fig. 11 is a schematic diagram illustrating a first position of a display module and a sound layer in a display device according to an embodiment of the present invention;

fig. 12 is a schematic diagram illustrating a second position of a display module and a sound layer in a display device according to an embodiment of the present invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. The display device comprises a cover plate 10, a display module 20, a battery 30, a middle frame 40 and a rear cover 50.

The cover plate 10 is made of a transparent material, and is usually made of glass, the display module 20 includes a display panel (not shown), which may be an OLED display panel or a liquid crystal display panel, and a driving circuit (not shown) for providing an external driving signal. The cover plate 10 is arranged in the light emitting direction of the display panel, the cover plate 10 and the display module 20 are attached through the first bonding layer 21, and the first bonding layer 21 is made of optical cement.

The display module 20 and the battery 30 are both disposed in the middle frame 40 and sealed by the cover plate 10 and the rear cover 50. The battery 30 is disposed under the display module 20 and supplies an electrical signal to the display module 20 through the first and second

flexible wiring boards

23 and 24.

Still be provided with buffer layer 22 between display module assembly 20 and center 40, buffer layer 22 is the bubble cotton, and the cotton for the protection display panel of bubble prevents that display panel from being destroyed with center 40 vibration striking in the use.

The battery 30 and the middle frame 40 are bonded together by a second adhesive layer 25, and the second adhesive layer 25 is typically a double-sided tape. The heat dissipation layer 26 is disposed between the battery 30 and the rear cover 50, and the heat dissipation layer 26 is made of graphite, which has good heat dissipation performance and can prevent the battery 30 from being affected by too high temperature.

The display device further comprises a sound production layer 100 and a connecting terminal, wherein the sound production layer 100 is arranged inside the display module 20, and the position of the sound production layer 100 is different according to the different types of the display panels in the display module 20.

Fig. 2 is a schematic plan view of a sound generation layer in a display device according to an embodiment of the present invention. The sounding layer 100 includes an exciter, which vibrates to drive the surrounding air to vibrate, and finally sounds to the ears. Only one actuator may be provided, or at least two actuators may be provided, and when a plurality of actuators are provided, the sound effect of the structure at a plurality of output positions is more excellent.

In the present embodiment, the first exciter 31, the second exciter 32, and the third exciter 33 are provided, wherein the first exciter 101 and the third exciter 103 on the left and right sides are used to generate high tones, and the second exciter 102 in the middle is used to generate low tones.

The connecting terminal is connected with the exciter and used for transmitting an external driving signal to the exciter so as to drive the exciter to vibrate and generate sound. In the present embodiment, the connection terminals include a first connection terminal 301, a second connection terminal 302, and a third connection terminal 303, wherein the first connection terminal 301 is connected to the first actuator 31, the second connection terminal 302 is connected to the second actuator 32, and the third connection terminal 303 is connected to the third actuator 33.

It should be noted that only one connection terminal may be provided, and the first actuator 101, the second actuator 102, and the third actuator 103 may be simultaneously connected to one connection terminal, and the connection terminal transmits an external driving signal to each of the three actuators to drive each actuator to vibrate and generate sound.

As shown in fig. 2, a first soundproof portion is provided between adjacent exciters. The first soundproof portion includes a first sub soundproof portion 310 and a second sub soundproof portion 320, wherein the first sub soundproof portion 310 is disposed between the first exciter 31 and the second exciter 32, and the second sub soundproof portion 320 is disposed between the second exciter 32 and the third exciter 33. The first sound insulation part is arranged between the adjacent exciters, so that the mutual interference of sound between the two exciters can be eliminated, the stereo is realized, and the tone quality and the user experience are improved.

The first soundproof portion may have at least one of a rectangular shape, a wave shape, or an arc shape, wherein the first soundproof portion is not parallel to the left and right sides of the display module 20 when the shape is the rectangular shape. Through setting first sound-proof part into various shapes, the sound wave that makes the exciter send is when transmitting to first sound-proof part, and the incident surface is out of plumb with incident sound wave, and the sound wave that reflects back like this is nonparallel with the direction of transmission sound wave, is difficult for taking place the standing wave to guaranteed that sound is not influenced, user experience is better.

In one embodiment, as shown in fig. 2, the display device further includes a flat layer 300, the flat layer 300 and the sound layer 100 are disposed on the same plane, and a second sound insulation portion is further disposed between the flat layer 300 and the sound layer 100.

The sounding layer 100 corresponds to an area near the human ear in the full-screen display device (similar to the position of the earpiece in the non-full-screen display device), and the size of the area can be set as required. Generally, the area is small, and the sound layer 100 is disposed in the display module 20, and in order to ensure the flatness of the display module 20, the flat layer 300 is disposed on the plane where the sound layer 100 is located. As shown in fig. 2, the areas other than the sound emission layer 100 are the flat layer 300, that is, the flat layer 300 is disposed on the sound emission layer 100 side, and a flat material is disposed in at least a partial area of the flat layer 300. The planar material may be transparent, such as glass, or opaque, such as an insulating material, such as silicon nitride. The sound layer 100 and the flat layer 300 together form a new film layer, and are disposed in the display module 20.

A second sound insulation portion is further provided between the flat layer 300 and the sound emission layer 100, the second sound insulation portion may be located at the flat layer 300, or at the sound emission layer 100, or at the boundary between the flat layer 300 and the sound emission layer 100, and the second sound insulation portion separates the first sound insulation portion and the exciter in the sound emission layer 100 from the flat layer 300.

When the area where the sounding layer 100 is located is small, as shown in fig. 2, the areas below, to the left, and to the right of the sounding layer 100 all belong to the flat layer 300. At this time, the second sound insulating part includes a third sub sound insulating part 330, a fourth sub sound insulating part 340, a fifth sub sound insulating part 350, a sixth sub sound insulating part 360, and a seventh sub sound insulating part 370, wherein the third sub sound insulating part 330 is disposed between the left side of the display module 20 and the first exciter 31, and the fourth sub sound insulating part 340 is disposed between the right side of the display module 20 and the third exciter 33.

The third sub sound insulating part 330 and the fourth sub sound insulating part 340 are provided to prevent sound waves generated from the exciter from being transmitted from the left and right sides of the display module 20, thereby generating leakage of sound, reducing loss of sound volume, and increasing output sound volume.

Fifth sub sound insulating part 350 is provided between third sub sound insulating part 330 and first sub sound insulating part 310, sixth sub sound insulating part 360 is provided between first sub sound insulating part 310 and second sub sound insulating part 320, and seventh sub sound insulating part 370 is provided between second sub sound insulating part 320 and fourth sub sound insulating part 340. The fifth sub sound insulating portion can prevent sound from leaking out from the lower side of the display module 20, reduce loss of sound volume, and increase output sound volume.

When the area of sound-emitting layer 100 is large, that is, flat layer 300 is only located below sound-emitting layer 100 in fig. 2, because the left and right sides of sound-emitting layer 100 do not have flat layer 300, third sub-sound-insulating part 330 can directly set up on the left side, also can leave certain interval with the left side, fourth sub-sound-insulating part 340 can directly set up on the right side, also can leave certain interval with the right side, fifth sub-sound-insulating part 350 sets up between the left and right sides of display module 20, and is connected with third sub-sound-insulating part 330 and fourth sub-sound-insulating part 340. Those skilled in the art can set the positions of the third sub sound insulating part 340 and the fourth sub sound insulating part 350 as needed as long as the function of blocking the sound from going out from the left and right sides is achieved.

The first and second acoustic isolation sections are both of a flexible material and have a height greater than the height of the exciter in an uncompressed state. When the sound production layer 100 is disposed in the display module 20, the film layer in the display module 20 compresses the first sound insulation portion and the second sound insulation portion, thereby achieving a good sealing effect. Through setting up the sound-proof part, can promote the directionality of sound, promote user's privacy.

By adjusting the height and width of the first sound insulating portion and the second sound insulating portion, the sound insulating effect and the output sound volume can be adjusted. The higher the intrinsic height of the first and second acoustic barrier portions, the greater the degree of compression and thus a better sealing effect is achieved. However, when the height is too large, the output of sound is affected, and the output volume is small; in addition, the width is also a similar principle, and when the intrinsic width of the first soundproof portion and the second soundproof portion is larger, the range of the available vibration is smaller, so that the soundproof effect is better, but the volume of the output sound is smaller. Those skilled in the art can select the optimal height and width parameters according to the required sound quality and volume.

Fig. 3 is a schematic diagram of a first structure of an actuator according to an embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, it generally comprises a first electrode layer 110, a first piezoelectric material layer 120 and a second electrode layer 130, which are arranged in a stack. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

The first actuator 31 includes at least one first vibration region 11 and at least one second vibration region 12, and the first vibration region 11 and the second vibration region 12 are alternately arranged.

In the present embodiment, the first actuator 31 includes two first vibration regions 11 and one second vibration region 12, and the two first vibration regions 11 are respectively located on both sides of the second vibration region 12.

In one embodiment, the first actuator 31 is a transparent material, i.e. the first electrode layer 110, the first piezoelectric material layer 120 and the second electrode layer 130 are all transparent materials.

In this embodiment, the first actuator 101 is a piezoelectric actuator, and when the driving circuit operates, the driving circuit transmits an external driving signal to the first electrode layer 110 and the second electrode layer 130 through the first connection terminal 301, so that the first piezoelectric material layer 120 vibrates, and the display panel is driven to vibrate. The material of the first piezoelectric material layer 120 may be lead zirconate titanate (PZT), aluminum nitride (AlN), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-trifluoroethylene copolymer P (VDF-TrFE), or the like. The material of the first electrode 110 and the second electrode 120 may be transparent Indium Tin Oxide (ITO).

In one embodiment, the first actuator 31 may be an opaque material, and the material of the first electrode 110 and the second electrode 120 may be a metal or an alloy of several metals, such as Ag, Al, Mo, Au, Cr, Ni, Cu, Pt, etc.

Because the vibration eigenfrequency of the piezoelectric material is in direct proportion to the film thickness of the piezoelectric material, when an input voltage signal is fixed, the frequency of input alternating current deviates from the eigenfrequency, the output sound pressure is small, and the frequency of the input alternating current is close to the eigenfrequency, so the output sound pressure is large. Therefore, the piezoelectric material with larger thickness is used for high frequency, the piezoelectric material with smaller thickness is used for low frequency, and the sound production effect of the designed structure is better.

In the prior art, the piezoelectric material layer of the exciter is usually only used with a thickness, i.e. one exciter can only emit high frequency sound or only emit low frequency sound. According to the invention, the thickness of the first piezoelectric material layer 120 in the exciter is set to be smaller in the first vibration area 11 than in the second vibration area 12, so that the exciter can generate low-frequency sound in the first vibration area 11, and generate high-frequency sound in the second vibration area 12, and compared with the condition that only high-frequency sound or only low-frequency sound can be generated, the exciter disclosed by the invention can realize three-dimensional sound production of screen vibration, and the sound production effect is better.

In the present embodiment, as shown in fig. 3, the first electrode layer 110 has a groove 1201 formed in the second vibration region 12, the first piezoelectric material layer 120 is formed in the groove 1201 and extends to cover the surface of the first electrode layer 110, and then the second electrode layer 130 is formed on the first piezoelectric material layer 120.

Fig. 4 is a schematic diagram of a second structure of the exciter according to the embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

As shown in fig. 3, the difference between the structures is that in the present embodiment, a first insulating layer 141 and a second insulating layer 142 that are not in contact with each other are further disposed on a side of the first electrode layer 110 away from the first piezoelectric material layer 120, and the first insulating layer 141 and the second insulating layer 142 are disposed on the same layer and are respectively located at two ends of the first electrode layer 110. Through setting up first insulating layer 141 and the second insulating layer 142 that do not contact each other, when the sound production layer 100 is installed in display module 20, form a cavity between the rete of first insulating layer 141, second insulating layer 142 and display module 20, the existence of cavity does benefit to the vibration of first piezoelectric material layer 120 more for first actuator 31 can send stronger sound wave.

Fig. 5 is a schematic diagram of a third structure of the exciter according to the embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

The difference from the structure of fig. 3 is that the first electrode layer 110 includes a first sub-electrode layer 111 and a second sub-electrode layer 112 that are not in contact with each other, the first sub-electrode layer 111 is located in the first vibration region 11, and the second sub-electrode layer 112 is located in the second vibration region 12. In one embodiment, after the first electrode layer 110, the first piezoelectric material layer 120 and the second electrode layer 130 are all fabricated, the first electrode layer 110 is partially removed to form the first sub-electrode layer 111 and the second sub-electrode layer 112 which are not in contact with each other.

By arranging the first electrode layer 110 as the first sub-electrode layer 111 and the second sub-electrode layer 112 which are not in contact with each other, when the sound-generating layer 100 is installed in the display module 20, a cavity is formed between the first sub-electrode layer 111, the second sub-electrode layer 112 and the film layer of the display module 20, and the existence of the cavity is more beneficial to the vibration of the first piezoelectric material layer 120, so that the first exciter 31 can emit stronger sound waves.

Fig. 6 is a schematic diagram of a fourth structure of the exciter according to the embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

The difference in structure as shown in fig. 3 is that, in this embodiment, the first electrode layer 110 is formed first, and the groove 1201 is formed in the second vibration region 12, the first piezoelectric material layer 120 is formed in the groove 1201, and in the first vibration region 11, the first piezoelectric material layer 120 is formed on the first electrode layer 110, that is, the first piezoelectric material layer 120 is different in height between the first vibration region 11 and the second vibration region 12, and is not connected to each other. Finally, a second electrode layer 130 is formed on the first piezoelectric material layer 120 in the second vibration region 12 and extends to cover the first piezoelectric material layer 120 in the first vibration region 11, thereby forming the first actuator 31.

Of course, the structure of the first actuator 31 is not limited thereto, and at least one of the first vibration region 11 and the second vibration region 12 further includes at least one second piezoelectric material layer 150 and at least one third electrode layer 160 corresponding to the second piezoelectric material layer 150 on the side of the second electrode layer 130 away from the first piezoelectric material layer 120, and the second piezoelectric material layers 150 and the third electrode layers 160 are alternately stacked.

At this time, when the second piezoelectric material layer 150 and the third electrode layer 160 are formed, the numbers of film layers in the first vibration region 11 and the second vibration region 12 may be equal or may not be equal.

In one embodiment, the second piezoelectric material layer 150 and the third electrode layer 160 may be formed in the first vibration region 11, and then the second piezoelectric material layer 150 and the third electrode layer 160 may be formed in the second vibration region 12, where the shapes of the second piezoelectric material layers 150 may be the same or different, and the shapes and thicknesses of the second piezoelectric material layers 150 and the third electrode layer 160 may be set as required.

In one embodiment, the second piezoelectric material layer 150 and the third electrode layer 160 may be formed at the first vibration region 11 and the second vibration region 12 at the same time.

In one embodiment, in the first vibration region 11 and the second vibration region 12, the second piezoelectric material layer 150 and the third electrode layer 160 are disposed, and the number of the second piezoelectric material layers 150 in each region is equal. Since the third electrode layer 160 corresponds to the second piezoelectric material layer 150, that is, the number of the third electrode layer 160 is equal to that of the second piezoelectric material layer 150, the same number of the second piezoelectric material layers 150 in each region means the same number of the third electrode layers 160 in each region.

Since the material of the second piezoelectric material layer 150 is the same in the first vibration region 11 and the second vibration region 12, and the material of the third electrode layer 160 is the same in the first vibration region 11 and the second vibration region 12, the second piezoelectric material layer 150 and the third electrode layer 160 can be formed simultaneously in the first vibration region 11 and the second vibration region 12 using one process, which is a simple production process.

The following is specifically described with reference to fig. 7 to 10.

Fig. 7 is a schematic diagram of a fifth structure of an exciter according to an embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

In this embodiment, two second piezoelectric material layers 150 and two corresponding third electrode layers 160 are formed in the first vibration region 11, and two second piezoelectric material layers 150 and two corresponding third electrode layers 160 are also formed in the second vibration region 12.

As shown in fig. 7, the first electrode layer 110 is formed first, and a groove 1201 is formed in the second vibration region 12, the first piezoelectric material layer 120 is formed in the groove 1201 in the second vibration region 12, and the first piezoelectric material layer 120 is formed on the first electrode layer 110 in the first vibration region 11, that is, the first piezoelectric material layer 120 is different in height between the first vibration region 11 and the second vibration region 12 and is not connected to each other. Finally, the second electrode layer 130 is simultaneously formed on the first piezoelectric material layer 120 in the first vibration region 11 and the second vibration region 12.

Then, a first second piezoelectric material layer 150 and a first third electrode layer 160 are sequentially formed on the second electrode layer 130 on the side away from the first piezoelectric material layer 120, and each film layer includes a portion formed in the first vibration region 11 and a portion formed in the second vibration region 12, and the two portions are independent of each other.

Finally, a second piezoelectric material layer 150 is formed on the first third electrode layer 160, the second piezoelectric material layer 150 is a whole layer structure, and finally, a second third electrode layer 160 is formed, and the layer is also a whole layer structure.

To this end, the first actuator 31 is completed, and the number of layers of the first actuator 31 in the first vibration region 11 is equal to the number of layers of the second vibration region 12.

In the present embodiment, the thickness of the at least one second piezoelectric material layer 150 in the first vibration region 11 is smaller than that in the second vibration region 12. As shown in fig. 7, the thickness of the first second piezoelectric material layer 150 in the first vibration region 11 is smaller than that in the second vibration region 12, and the thickness of the second piezoelectric material layer 150 in the first vibration region 11 is also smaller than that in the second vibration region 12.

The present invention is configured such that the thickness of the first piezoelectric material layer 120 in the actuator is smaller in the first vibration region 11 than in the second vibration region 12, and the thickness of the at least one second piezoelectric material layer 150 on the second electrode layer 130 in the first vibration region 11 is smaller than in the second vibration region 12, so that the actuator can generate low-frequency sound in the first vibration region 11 and high-frequency sound in the second vibration region 12, and the sound emission effect of the actuator of the present invention is better than that of the actuator which can only emit high-frequency sound or only low-frequency sound. In addition, the first actuator 31 has a structure in which a plurality of piezoelectric material layers and a plurality of electrode layers are stacked, and the displacement is larger during vibration, so that vibration can be better output to drive the whole panel to vibrate and generate sound.

Fig. 8 is a schematic diagram of a sixth structure of an exciter according to an embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

The difference from the structure of fig. 7 is that in this embodiment, a first insulating layer 141 and a second insulating layer 142 that are not in contact with each other are further disposed on a side of the first electrode layer 110 away from the first piezoelectric material layer 120, and the first insulating layer 141 and the second insulating layer 142 are disposed on the same layer and are respectively located at two ends of the first electrode layer 110. Through setting up first insulating layer 141 and the second insulating layer 142 that do not contact each other, when the sound production layer 100 is installed in display module 20, form a cavity between the rete of first insulating layer 141, second insulating layer 142 and display module 20, the existence of cavity does benefit to the vibration of first piezoelectric material layer 120 more for first actuator 31 can send stronger sound wave.

Fig. 9 is a schematic diagram of a seventh structure of the exciter according to the embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

The difference from the structure of fig. 7 is that the first electrode layer 110 includes a first sub-electrode layer 111 and a second sub-electrode layer 112 that are not in contact with each other, the first sub-electrode layer 111 is located in the first vibration region 11, and the second sub-electrode layer 112 is located in the second vibration region 12. In one implementation, after all the piezoelectric material layers and the electrode layers of the first actuator 31 are fabricated, the first electrode layer 110 may be partially removed to form the first sub-electrode layer 111 and the second sub-electrode layer 112 that are not in contact with each other.

Fig. 10 is a schematic diagram of an eighth structure of the exciter according to the embodiment of the present invention. Taking the first actuator 31 in fig. 2 as an example, the first actuator includes a first electrode layer 110, a first piezoelectric material layer 120, and a second electrode layer 130, which are stacked. Wherein the first actuator 31 includes a first vibration region 11 and a second vibration region 12, and the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12.

In this embodiment, two second piezoelectric material layers 150 and two corresponding third electrode layers 160 are formed in the first vibration region 11, and two second piezoelectric material layers 150 and two corresponding third electrode layers 160 are also formed in the second vibration region 12. The difference from the structure of fig. 7 is that all the film layers are disposed in a whole layer in this embodiment.

As shown in fig. 10, the first electrode layer 110 is formed in the second vibration region 12 with a groove 1201, the first piezoelectric material layer 120 is formed in the groove 1201, and extends to cover the surface of the first electrode layer 110, and then forms the second electrode layer 130 on the first piezoelectric material layer 120, the second electrode layer 130 forms a first groove 1202 in the second vibration region 12, the first second piezoelectric material layer 150 is formed in the first groove 1202, and extending to cover the surface of the second electrode layer 130, and forming a first third electrode layer 160 on the first second piezoelectric material layer 150, wherein the first third electrode layer 160 forms a second groove 1203 in the second vibration region 12, the second piezoelectric material layer 150 is formed in the second groove 1203, and extends over the surface of the first third electrode layer 160, and finally forms a second third electrode layer 160 on the second piezoelectric material layer 150 to form the first actuator 31. By analogy, more stacked structures of the second piezoelectric material layer 150 and the third electrode layer 160 may be formed.

In fig. 3 to 10, taking the structure of the first actuator 101 as an example, the structures of the second actuator 102 and the third actuator 103 may be the same as or different from the structure of the first actuator 101, and may include only the first electrode layer 110, the second electrode layer 130, and the middle first piezoelectric material layer 120, or may include more third electrode layers 160 and more second piezoelectric material layers 150, and the structure of each actuator may be provided as needed.

It should be noted that, in the above embodiment, two first vibration regions 11 and one second vibration region 12 sandwiched therebetween are taken as an example, but the number of the first vibration regions 11 and the second vibration regions 12 is not limited thereto, and each actuator may include a plurality of first vibration regions 11 and a plurality of second vibration regions 12 alternately arranged with the first vibration regions 11, and when the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12, it is not limited to the manner in which the first electrode layer 110 forms the groove.

In one embodiment, the first electrode layer 110 may be a planar structure disposed in a whole layer, and then the first piezoelectric material layer 120 is formed on the first electrode layer 110, and the first piezoelectric material layer 120 is patterned to be formed in the first vibration region 11 with a smaller thickness than the second vibration region 12, and then other film layers are formed thereon.

Of course, there are many ways to form the electrode layers and the dielectric material layers, and the present invention does not limit the way to form each electrode layer and each dielectric material layer in the actuator as long as the thickness of the first piezoelectric material layer 120 in the first vibration region 11 is smaller than that in the second vibration region 12, and the uppermost layer and the lowermost layer of the actuator are both electrode layers.

In the present invention, by setting the thickness of the first piezoelectric material layer 120 in the actuator to be smaller in the first vibration region 11 than in the second vibration region 12, the actuator can generate low-frequency sound in the first vibration region 11 and high-frequency sound in the second vibration region 12, and the sound production effect of the actuator of the present invention is better than that of the actuator which can only generate high-frequency sound or only generate low-frequency sound. In addition, the first actuator 31 adopts a structure in which a plurality of piezoelectric material layers and a plurality of electrode layers are stacked, and a cavity is formed below the first electrode layer 110, so that the piezoelectric material layers are displaced more when vibrating, and can better output the vibration to drive the whole panel to vibrate and sound.

The sounding layer 100 is disposed inside the display module 20, and the sounding layer 100 is located at different positions according to different types of display panels in the display module 20.

Fig. 11 is a schematic diagram illustrating a first position of a display module and a sound layer in a display device according to an embodiment of the present invention. In this embodiment, the display module is a liquid crystal display module, and the liquid crystal display module includes an array substrate 101 and a color filter substrate 102 that are arranged in an opposite-box manner, a liquid crystal layer 103 filled between the array substrate 101 and the color filter substrate 102, a first polarizer 104 arranged on a side of the array substrate 101 away from the color filter substrate 102, and a second polarizer 105 arranged on a side of the color filter substrate 102 away from the array substrate 101.

In the present embodiment, the liquid crystal display panel is of a COA structure, that is, the color resist layer is formed on the side of the array substrate 101 close to the liquid crystal layer 103, wherein the color resist layer includes a plurality of red color resists 1011, a plurality of green color resists 1012, and a plurality of blue color resists 1013. Because the liquid crystal display panel with the COA structure does not have the alignment problem of the color film substrate 102 and the array substrate 101, the difficulty of box alignment process in the preparation process of the display panel can be reduced, and errors in box alignment are avoided. Of course, other types of liquid crystal display panels may be used, and the type of the liquid crystal display panel is not limited in the present invention.

The array substrate 101, the color filter substrate 102 and the liquid crystal layer 103 constitute a liquid crystal display panel, a backlight module 106 is further disposed below the liquid crystal display panel, the backlight module 106 may be a direct-type backlight structure or an edge-type backlight structure, and the type of the backlight module 106 is not limited in the present invention.

The display module 20 further includes a driving circuit for providing an external driving signal to the sound layer 100, and a panel driving circuit for providing an external driving signal to the display panel. The driving circuit comprises a first driving chip 1102 and a third flexible circuit board 1101, the third flexible circuit board 1101 is connected with the first driving chip 1102 and a connecting terminal (not shown) in the sounding layer 100, and the first driving chip 1102 provides an external driving circuit signal for driving the exciter to vibrate and sound; the panel driving circuit includes a second driving chip 1001 and a fourth flexible circuit board 1002, the fourth flexible circuit board 1002 connects the second driving chip 1001 and a bonding area terminal (not shown) of the array substrate 101, and the second driving chip 1001 provides an external driving circuit signal for controlling liquid crystal deflection.

The sound emission layer 100 is disposed in a direction in which the array substrate 101 is away from the first polarizer 104.

In one embodiment, as shown in fig. 11, the sound generation layer 100 is disposed on a side of the color film substrate 102 close to the liquid crystal layer 103.

The piezoelectric material layer of the sound generation layer 100 may be made of lead zirconate titanate (PZT), aluminum nitride (AlN), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-trifluoroethylene copolymer P (VDF-TrFE), or the like.

When lead zirconate titanate (PZT) is used, since the sintering temperature of the lead zirconate titanate (PZT) is greater than 1000 ℃, the electrode layer and the piezoelectric material layer can be prepared first, and then the prepared actuator is attached to the color film substrate 102 by glue or double-sided adhesive tape.

When the polymer material polyvinylidene fluoride (PVDF) or polyvinylidene fluoride (PVDF) is used, the processing temperature is only more than 100 degrees, and the in-situ manufacturing can be directly completed on the color film substrate 102.

In one embodiment, the sound emitting layer 100 is disposed on a side of the array substrate 101 adjacent to the liquid crystal layer 102.

In one embodiment, the sound layer 100 is disposed between the color filter substrate 102 and the second polarizer 105.

In one embodiment, the sound emitting layer 100 is disposed on a side of the second polarizer 105 away from the color filter substrate 102.

In this embodiment, the display device may further include a touch layer (not shown), and the touch layer may be disposed at a plurality of positions according to whether the display module 20 is an on-cell structure or an in-cell structure.

In an embodiment, the display module 20 is an on-cell structure, and the touch layer is disposed on the color filter substrate 102 away from the array substrate 101.

At this time, when the sound generation layer 100 is disposed between the color filter substrate 102 and the second polarizer 105, the touch layer may be disposed between the sound generation layer 100 and the color filter substrate 102, or disposed between the sound generation layer 100 and the second polarizer 105. When the sound emitting layer 100 is disposed on a side of the second polarizer 105 away from the color filter substrate 102, the touch layer may be disposed between the sound emitting layer 100 and the second polarizer 105.

In an embodiment, the display module 20 is an in-cell structure, and the touch layer is disposed on the color film substrate 102 in a direction close to the array substrate 101. At this time, when the sound layer 100 is disposed on the side of the color filter substrate 102 close to the liquid crystal layer 103, the touch layer may be disposed between the color filter substrate 102 and the sound layer 100, or between the liquid crystal layer 103 and the sound layer 100. The in-cell structure can further make the display module 20 light and thin.

Fig. 12 is a schematic diagram of a second position of a display module and a sound layer in a display device according to an embodiment of the present invention. In this embodiment, the display module 20 is an OLED display module, which includes a substrate 201, a driving circuit layer 202, a pixel defining layer 203, a light emitting layer and an encapsulation layer 207, wherein the light emitting layer includes a pixel electrode 204 formed between adjacent pixel defining layers 203, a light emitting material layer 205 formed on the pixel electrode 204, and a common electrode 206 formed on the pixel defining layer 203 and the light emitting material layer 205. The sound emission layer 100 is disposed in a direction in which the light emission layer is away from the pixel defining layer 203.

The display module 20 further includes a driving circuit for providing an external driving signal to the sound emitting layer 100, and a panel driving circuit for providing an external driving signal to the OLED display panel. The driving circuit comprises a third driving chip 2102 and a fifth flexible circuit board 2101, the fifth flexible circuit board 2101 is connected with the third driving chip 2102 and a connecting terminal (not shown) in the sounding layer 100, and the third driving chip 2102 provides an external driving circuit signal for driving the exciter to vibrate and sound; the panel driving circuit includes a fourth driving chip 2001 and a sixth flexible circuit board 2002, the sixth flexible circuit board 2002 connects the fourth driving chip 2001 and a binding terminal (not shown) of the driving circuit layer 202, and the fourth driving chip 2001 provides an external driving circuit signal for controlling the panel to emit light.

In one embodiment, as shown in fig. 12, the sound emitting layer 100 is disposed on a side of the encapsulation layer 207 away from the light emitting layer.

In one embodiment, the sound generating layer 100 is disposed between the light emitting layer and the encapsulation layer 207.

In fig. 11 and 12, by placing the sounding layer 100 in the display module 20, an external exciter is not required to be additionally arranged, so that the thickness of the display device can be reduced. Meanwhile, the sounding layer 100 is simple in structure and easy to manufacture, and production efficiency is improved.

According to the above embodiments:

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A display device, comprising:

2. The display device according to claim 1, wherein the actuator includes at least one of the first vibration region and at least one of the second vibration region, the first vibration region and the second vibration region being alternately arranged.

3. The display device according to claim 1, wherein at least one of the first vibration region and the second vibration region further includes at least one second piezoelectric material layer and at least one third electrode layer corresponding to the second piezoelectric material layer on a side of the second electrode layer away from the first piezoelectric material layer, the second piezoelectric material layer and the third electrode layer being alternately stacked.

4. The display device according to claim 3, wherein the second piezoelectric material layer and the third electrode layer are provided in both the first vibration region and the second vibration region, and the number of the second piezoelectric material layers in each region is equal.

5. The display device according to claim 1, wherein the first electrode layer includes a first sub-electrode layer and a second sub-electrode layer which are not in contact with each other, the first sub-electrode layer is located in the first vibration region, and the second sub-electrode layer is located in the second vibration region.

6. The display device according to claim 1, wherein a first insulating layer and a second insulating layer which are not in contact with each other are further disposed on a side of the first electrode layer away from the first piezoelectric material layer, and the first insulating layer and the second insulating layer are disposed on the same layer and are respectively disposed at two ends of the first electrode layer.

7. The display device according to claim 1, wherein the sound emission layer includes at least two exciters, and a first soundproof portion is provided between adjacent ones of the exciters.

8. The display device according to claim 7, further comprising a flat layer provided on a side of the sound emission layer, wherein a second sound insulating portion is further provided between the flat layer and the sound emission layer.

9. The display device according to claim 1, wherein the display module is a liquid crystal display module, the liquid crystal display module comprises an array substrate and a color film substrate which are arranged in a box-to-box manner, a liquid crystal layer filled between the array substrate and the color film substrate, a first polarizer arranged on one side of the array substrate away from the color film substrate, and a second polarizer arranged on one side of the color film substrate away from the array substrate, and the sound-emitting layer is arranged in a direction in which the array substrate is away from the first polarizer.

10. The display device according to claim 1, wherein the display module is an OLED display module including a substrate, a driving circuit layer, a pixel defining layer, a light emitting layer, and an encapsulation layer, and the sound emitting layer is disposed between the light emitting layer and the encapsulation layer or on a side of the encapsulation layer away from the light emitting layer.