CN113611727B - Sounding display screen, manufacturing method and working method thereof and display device - Google Patents
Sounding display screen, manufacturing method and working method thereof and display device Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000002955 isolation Methods 0.000 claims abstract description 110
- 239000000758 substrate Substances 0.000 claims abstract description 110
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 10
- 229910002113 barium titanate Inorganic materials 0.000 claims description 6
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 6
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000004148 unit process Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 3
- 125000006850 spacer group Chemical group 0.000 claims 3
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000005538 encapsulation Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 5
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 229920001621 AMOLED Polymers 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 239000011368 organic material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
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- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
The invention provides a sounding display screen, a preparation method and a working method thereof, and a display device, wherein the sounding display screen comprises: a substrate; the sounding film layer is arranged opposite to the substrate; the piezoelectric film layer is positioned on the surface of one side of the sounding film layer facing the substrate; a light-emitting structure, which is positioned on one side surface of the substrate facing the piezoelectric film layer; the piezoelectric isolation structure is positioned between the substrate and the piezoelectric film layer and at the side part of at least part of the light-emitting structure, and comprises a piezoelectric isolation column and a second driving electrode connected with the piezoelectric isolation column; a second driving module on the substrate, the second driving module comprising: the device comprises a data receiving unit, a data processing unit and a data feedback unit. The service life of the sounding display screen is prolonged.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a sounding display screen, a preparation method and a working method thereof, and a display device.
Background
With the increasing demands of people on the quality and the use feeling of electronic products, more and more functions are expected to be developed, such as an under-screen sounding technology for realizing sound and picture integration. In order to realize better under-screen sounding effect at present, the volume of sounding module is great, and the vibration that under-screen sounding produced also has apparent influence to screen itself life-span, and great vibration can cause the luminescent unit to damage and cause bad point to lead to the product bad, has influenced the life-span of sounding display screen, consequently, the life-span of sounding display screen that prior art provided remains to improve.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of short service life of the sounding display screen provided by the prior art, and further provides the sounding display screen, a preparation method and a working method thereof and a display device.
The invention provides a sounding display screen, comprising: a substrate; the sounding film layer is arranged opposite to the substrate; the piezoelectric film layer is positioned on the surface of the sounding film layer, facing one side of the substrate; the light-emitting structure is positioned on one side surface of the substrate facing the piezoelectric film layer; the piezoelectric isolation structure is positioned between the substrate and the piezoelectric film layer and at the side part of at least part of the light-emitting structure, and comprises a piezoelectric isolation column and a second driving electrode connected with the piezoelectric isolation column; a second driving module on the substrate, the second driving module comprising: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit is suitable for outputting the voltage feedback signal to the second driving electrode.
Optionally, the piezoelectric film layer includes a plurality of spaced sub-piezoelectric film layers, and the plurality of sub-piezoelectric film layers are arrayed; the number of the piezoelectric isolation structures is a plurality of, and the piezoelectric isolation structures are positioned below the sub-piezoelectric film layers.
Optionally, one or several light emitting structures are arranged between each sub-piezoelectric film layer and the substrate.
Optionally, the sounding film layer is of a whole-surface structure.
Optionally, the piezoelectric film layer has a whole-surface structure; the sounding film layer is of a whole-surface structure.
Optionally, the orthographic projection of the piezoelectric film layer on the surface of the substrate falls inside the orthographic projection of the sounding film layer on the surface of the substrate.
Optionally, the sounding display screen further includes: the support frame is positioned on the edge of the substrate and supports the sounding film layer and the substrate.
Optionally, the method further comprises: the first electrode is positioned on the surface of the piezoelectric film layer facing to one side of the sounding film layer, and the second electrode is positioned on the surface of the piezoelectric film layer facing to one side of the substrate.
Optionally, the sounding display screen further includes: and the first driving module is positioned on the substrate and is electrically connected with the first electrode and the second electrode.
Optionally, the piezoelectric film layer includes a barium titanate ceramic film layer or a lead zirconate titanate ceramic film layer.
Optionally, the thickness of the piezoelectric film layer is 50 μm to 400 μm.
Optionally, the sounding film layer includes a polyimide sounding film layer.
Optionally, the thickness of the sounding film layer is 100-300 μm.
Optionally, the second driving electrode includes: a third electrode located on a sidewall of the piezoelectric isolating post; a fourth electrode located between the piezoelectric film layer and the piezoelectric isolating post; the second driving module is electrically connected with the third electrode and the fourth electrode.
Optionally, the piezoelectric isolating post comprises a barium titanate ceramic isolating post or a lead zirconate titanate ceramic isolating post.
Optionally, the distance between adjacent piezoelectric isolation structures is 50-200 μm, the height of the piezoelectric isolation column is 100-150 μm, and the width of the piezoelectric isolation column is 5-15 μm.
Optionally, the sounding display screen further includes: and the isolation packaging layer is positioned between the piezoelectric film layer and the fourth electrode.
Optionally, a plurality of strip-shaped fifth electrodes are arranged on the surface of one side, facing the piezoelectric film layer, of the substrate, a plurality of strip-shaped sixth electrodes are arranged on one side, facing away from the substrate, of the fifth electrodes, and the extending direction of the sixth electrodes is perpendicular to the extending direction of the fifth electrodes; the light emitting structure is positioned between a part of the fifth electrode and a part of the sixth electrode; the piezoelectric isolation structure is located at a side of the sixth electrode and is spaced apart from the sixth electrode.
Optionally, the sounding display screen further includes: and the piezoelectric isolation structure faces to the insulating layer on one side surface of the fifth electrode.
Optionally, the sounding display screen further includes: and the packaging layer coats the side wall of the light-emitting structure and the sixth electrode.
Optionally, a fifth electrode arranged in an array is arranged on the surface of one side, facing the piezoelectric film layer, of the substrate; the substrate is provided with a pixel limiting layer, the pixel limiting layer is provided with a pixel opening, and the pixel opening is positioned on the fifth electrode; the light emitting structure is positioned in the pixel opening; and a sixth electrode is arranged on one side of the fifth electrode, which is away from the substrate.
Optionally, a piezoelectric isolation structure is located on the pixel defining layer at a side of the light emitting structure and spaced apart from the sixth electrode.
Optionally, the piezoelectric isolation structure penetrates the sixth electrode and is spaced from the sixth electrode;
optionally, the sounding display screen further includes: and the insulating layer is positioned on one side surface of the piezoelectric isolation structure, which faces the substrate.
Optionally, the sounding display screen further includes: and the packaging layer covers the sixth electrode and exposes the piezoelectric isolation structure.
The invention also provides a preparation method of the sounding display screen, which comprises the following steps: providing a substrate; forming a light emitting structure on the substrate; forming a piezoelectric isolation structure on the substrate, wherein the piezoelectric isolation structure is positioned on the side part of at least part of the light-emitting structure; the forming step of the piezoelectric isolation structure comprises the following steps: forming piezoelectric isolation columns on the substrate, wherein the piezoelectric isolation columns are positioned on the side parts of at least part of the light-emitting structures; forming a second driving electrode connected with the piezoelectric isolating post; a piezoelectric film layer is arranged on one side of the piezoelectric isolation structure, which is away from the substrate; a sounding film layer is arranged on the surface of one side of the piezoelectric film layer, which is away from the substrate; forming a second driving module on the substrate, the second driving module including: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit is suitable for outputting the voltage feedback signal to the second driving electrode.
The invention also provides a working method of the sounding display screen, which comprises the following steps: driving the piezoelectric film layer to vibrate, wherein the piezoelectric film layer drives the sounding film layer to sound; the piezoelectric isolating column outputs a voltage output signal to the data processing unit after being vibrated by the piezoelectric film layer; the data processing unit processes the voltage output signal and outputs a voltage feedback signal to the data feedback unit, wherein the voltage feedback signal and the voltage output signal are opposite; the data feedback unit outputs a voltage feedback signal to the second driving electrode.
The present invention also provides a display device including: the invention relates to a sounding display screen.
The technical scheme of the invention has the following beneficial effects:
1. according to the sounding display screen provided by the technical scheme of the invention, the piezoelectric film layer is arranged on the surface of one side of the sounding film layer facing the substrate, and vibration of the piezoelectric film layer drives the sounding film layer to make sound; the piezoelectric isolation structure is positioned between the substrate and the piezoelectric film layer and at the side part of at least part of the light-emitting structure, and comprises a piezoelectric isolation column and a second driving electrode connected with the piezoelectric isolation column. The second driving module includes: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, and the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit. Because the voltage feedback signal is opposite to the voltage output signal, the data feedback unit outputs the voltage feedback signal to the second driving electrode, so that the piezoelectric isolation structure can generate micro-vibration to offset the vibration amplitude of at least part of the piezoelectric film layer, the phenomenon that the light-emitting structure is damaged due to the larger vibration amplitude of the piezoelectric film layer to cause bad products is avoided, and the service life of the sounding display screen is prolonged.
2. Further, the sub-piezoelectric film layers are arrayed, the sub-sounding film layers are arrayed, the sounding devices are arranged in a dot matrix mode, sounds of different sizes are emitted from different areas, and sound is emitted in a partitioning mode.
3. The display device provided by the technical scheme of the invention comprises the sounding display screen provided by the invention, so that the service life of the display device is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a sound-emitting display screen according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a sound display according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a sound-emitting display screen according to another embodiment of the present invention;
fig. 4 is a schematic top view of a sound display screen according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 and fig. 2, fig. 2 is a top view of fig. 1, which includes:
a substrate 1;
a sounding film layer 2 arranged opposite to the substrate 1;
a piezoelectric film layer 3 positioned on the surface of the sound-producing film layer 2 facing the side of the substrate 1;
a light emitting structure 4, the light emitting structure 4 being located on a side surface of the substrate 1 facing the piezoelectric film layer 3;
a piezoelectric isolation structure 5, the piezoelectric isolation structure 5 being located between the substrate 1 and the piezoelectric film layer 3 and being located at a side portion of at least a part of the light emitting structure 4, the piezoelectric isolation structure 5 including a piezoelectric isolation column 501 and a second driving electrode connected to the piezoelectric isolation column 501;
a second driving module 8 located on the substrate 1, the second driving module 8 comprising: the data receiving unit 81, the data processing unit 82 and the data feedback unit 83, wherein the data receiving unit 81 is suitable for receiving the voltage output signal of the piezoelectric isolating post 501 after being vibrated by the piezoelectric film layer, the data processing unit 82 is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit 83 is suitable for outputting the voltage feedback signal to the second driving electrode.
The voltage feedback signal and the voltage output signal are inversely referred to as: the voltage feedback signal is negative when the voltage output signal is positive, and positive when the voltage output signal is negative. The absolute value of the voltage feedback signal and the absolute value of the voltage output signal are equal or unequal.
The substrate 1 is a flexible substrate or the substrate is a rigid substrate such as a glass substrate. The material of the sound generating film layer 2 comprises flexible material such as polyimide.
The thickness of the sound-emitting film layer 2 is 100 μm to 300 μm, for example, 100 μm, 200 μm or 300 μm.
The piezoelectric film layer 3 comprises a barium titanate ceramic film layer or a lead zirconate titanate ceramic film layer.
The thickness of the piezoelectric film layer 3 is 50 μm to 400 μm, for example, 50 μm, 100 μm, 200 μm, 300 μm or 400 μm.
In this embodiment, the sounding film layer 2 has a whole surface structure, and the piezoelectric film layer 3 has a whole surface structure. The orthographic projection of the piezoelectric film layer 3 on the surface of the substrate falls inside the orthographic projection of the sounding film layer 2 on the surface of the substrate, and the area of the sounding film layer 2 is larger than that of the piezoelectric film layer 3. The edge area of the sounding film layer 2 beyond the piezoelectric film layer 3 is located on a supporting frame 11, and the supporting frame 11 is used for supporting the sounding film layer 2 and the substrate 1. The supporting frame 11 is located at the edge position of the substrate.
With continued reference to fig. 1, the first driving electrode includes a first electrode 601 and a second electrode 602, the first electrode 601 is located on a surface of the piezoelectric film layer 3 facing the sounding film layer 2, and the second electrode 602 is located on a surface of the piezoelectric film layer 3 facing the substrate 1. When the piezoelectric film layer 3 has a whole structure, the first electrode 601 is located on an edge surface of the piezoelectric film layer 3 facing the sound generating film layer 2, and the second electrode 602 is located on an edge surface of the piezoelectric film layer 3 facing the substrate 1. The number of the first electrodes 601 may be one or several. The number of the second electrodes 602 may be one or several.
The substrate includes a non-display area 102, and the sound-emitting display screen further includes: the first driving module 13 is disposed on the substrate 1, the first driving module 13 is disposed on the non-display area 102, and the first driving module is electrically connected to the first electrode 601 and the second electrode 602. The first driving module is configured to apply a first driving voltage to the upper surface and the lower surface of the piezoelectric film layer 3 through the first electrode 601 and the second electrode 602, so that the piezoelectric film layer 3 vibrates in the longitudinal direction, and the vibration of the piezoelectric film layer 3 drives the sounding film layer 2 to make a sound. The first electrode 601 and the second electrode 602 constitute a first driving electrode. The first driving electrode is adapted to apply a first driving voltage to the upper and lower surfaces of the piezoelectric film layer 3.
The sound-producing display screen further includes: and a third driving module 18 on the non-display region of the substrate, the third driving module 18 being adapted to apply a driving voltage to the light emitting structure.
The first driving module 13, the second driving module 8 and the third driving module 18 may be integrated on the same chip, or may be separately provided in different chips.
The light emitting structure 4 includes: a light emitting layer; a first carrier layer located between the light emitting layer and the substrate; and the second carrier layer is positioned on the surface of the light-emitting layer, which is opposite to one side of the substrate. The first carrier layer includes a first carrier injection layer, a first carrier transport layer between the first carrier injection layer and the light emitting layer, and a second carrier blocking layer between the first carrier transport layer and the light emitting layer. The second carrier layer includes a second carrier injection layer, a second carrier transport layer between the second carrier injection layer and the light emitting layer, and a first carrier blocking layer between the second carrier transport layer and the light emitting layer.
When the first carrier is a hole, the second carrier is an electron. When the first carrier is an electron, the second carrier is a hole. In this embodiment, when the first carrier is a hole, the second carrier is an electron.
With continued reference to fig. 1, the piezoelectric isolating structure 5 includes: a piezoelectric isolating column 501; a third electrode 502 located on a side wall of the piezoelectric isolating post 501; and a fourth electrode 503 located between the piezoelectric film layer 3 and the piezoelectric isolating post 501. The second driving electrode includes a third electrode 502 and a fourth electrode 503.
The piezoelectric isolating post 501 comprises a barium titanate ceramic isolating post or a lead zirconate titanate ceramic isolating post.
The pitch and the size of the piezoelectric isolation structures 5 may be reasonably selected according to the size of the light emitting structure 4, and are not limited thereto, and in this embodiment, the pitch between adjacent piezoelectric isolation structures 5 is 50 μm to 200 μm, for example, 50 μm, 100 μm, 150 μm or 200 μm, the height of the piezoelectric isolation column 501 is 100 μm to 150 μm, for example, 100 μm, 120 μm or 150 μm, and the width of the piezoelectric isolation column 501 is 5 μm to 15 μm, for example, 5 μm, 10 μm or 15 μm.
Referring to fig. 2, the substrate 1 includes a non-display area 102, and the sound-emitting display screen further includes: and a second driving module 8, the second driving module 8 being disposed on the non-display area 102, the second driving module 8 being electrically connected to the third electrode 502 and the fourth electrode 503 (connection lines are not shown in fig. 2). The display area of the substrate 1 is 101.
The second drive electrode is adapted to apply voltage feedback signals to the top and bottom regions of the piezoelectric isolating post 501.
In another embodiment, referring to fig. 3 and 4, fig. 4 is a top view of fig. 3, wherein the piezoelectric film layer includes a plurality of spaced sub-piezoelectric film layers 301, and the plurality of sub-piezoelectric film layers 301 are arranged in an array; the number of the piezoelectric isolation structures 5 is a plurality, and the piezoelectric isolation structures 5 are located below the sub-piezoelectric film layer 301. Each of the sub-piezoelectric film layers 301 has one or several of the light emitting structures 4 between the substrate 1. In the present embodiment, four light emitting structures 4 are provided under each sub-piezoelectric film layer 301. In other embodiments, other numbers of light emitting structures, such as 1, 2, 3, or greater than 4, are provided under each sub-piezoelectric film layer 301. The sounding film layer 2 is of a whole-surface structure. The substrate 1 comprises a display area 101, and the sounding film layer 2, the piezoelectric film layer 3, the light-emitting structure 4 and the piezoelectric isolation structure 5 are positioned on the display area 101.
In this embodiment, the sound-emitting display screen is a passive matrix organic electroluminescent diode (PMOLED), a plurality of strip-shaped fifth electrodes 9 are disposed on a surface of the substrate 1 facing the piezoelectric film layer 3, a plurality of strip-shaped sixth electrodes 10 are disposed on a side of the fifth electrodes 9 facing away from the substrate 1, when the sound-emitting display screen is a top-emission passive matrix organic electroluminescent diode, the fifth electrodes 9 are cathodes, the sixth electrodes 10 are anodes, and when the sound-emitting display screen is a bottom-emission passive matrix organic electroluminescent diode, the fifth electrodes 9 are anodes, and the sixth electrodes 10 are cathodes; the extending direction of the sixth electrode 10 is perpendicular to the extending direction of the fifth electrode 9; the light emitting structure 4 is located between a part of the fifth electrode 9 and a part of the sixth electrode 10; the piezoelectric isolating structure 5 is located at a side of the sixth electrode 10 and is spaced apart from the sixth electrode 10.
The sound-producing display screen further includes: the piezoelectric isolating structure 5 faces the insulating layer 7 on one side surface of the fifth electrode 9. The insulating layer 7 prevents the electrical signal of the fifth electrode 9 from being applied to the piezoelectric isolating structure. The sound-producing display screen further includes: and an encapsulation layer 12, wherein the encapsulation layer 12 encapsulates the side wall of the light emitting structure 4 and the sixth electrode 10. The encapsulation layer 12 is used for isolating water and oxygen, preventing organic materials from being corroded, and prolonging the service life of the sounding display screen. In this embodiment, the structure of the encapsulation layer 12 includes a composite layer structure of a first silicon nitride layer, a hexamethyldisiloxane layer, and a second silicon nitride layer, wherein the hexamethyldisiloxane layer is located between the first silicon nitride layer and the second silicon nitride layer. The sound-producing display screen further includes: and the isolation packaging layer is positioned on the surface of the piezoelectric isolation structure 5, which is opposite to the side of the substrate 1, and the isolation packaging layer is made of the same material as the packaging layer 12.
In other embodiments, the sound-emitting display screen is an active organic light emitting diode (AMOLED), a fifth electrode arranged in an array is arranged on a surface of the substrate facing the piezoelectric film layer, the fifth electrode is an anode, a pixel limiting layer is arranged on the substrate, a pixel opening is arranged in the pixel limiting layer, and the pixel opening is positioned on the fifth electrode; the light emitting structure is positioned in the pixel opening; a sixth electrode is arranged on one side of the fifth electrode, which is opposite to the substrate, and the sixth electrode is an anode; the light emitting structure is positioned between the fifth electrode and part of the sixth electrode; the piezoelectric isolation structure is located on the pixel defining layer at the side of the light emitting structure and is spaced from the sixth electrode, preferably, the piezoelectric isolation structure penetrates through the sixth electrode and is spaced from the sixth electrode, so that the supporting performance of the piezoelectric isolation structure on the substrate and the piezoelectric film layer is improved. The sound-producing display screen further includes: and the piezoelectric isolation structure faces to the insulating layer on one side surface of the fifth electrode. The sound-producing display screen further includes: and the packaging layer covers the sixth electrode and exposes the piezoelectric isolation structure.
The working principle of the sounding display screen provided by the embodiment is as follows: the first driving voltage is applied to the upper surface and the lower surface of the piezoelectric film layer 3 through the first electrode 601 and the second electrode 602, the piezoelectric film layer 3 vibrates due to the fact that electric energy is converted into mechanical energy under the action of the first driving voltage, the sounding film layer 2 is driven to vibrate to generate sound, meanwhile, the piezoelectric isolation structure 5 is driven to vibrate, the piezoelectric isolation structure 5 generates a voltage output signal due to the fact that the piezoelectric isolation structure 5 has the fact that the mechanical energy is converted into electric energy, the voltage output signal is transmitted to the data receiving unit of the second driving chip through the third electrode 502 and the fourth electrode 503, the data processing is suitable for processing the voltage output signal and outputting the voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, the data feedback unit outputs the voltage feedback signal to the second driving electrode, the piezoelectric isolation structure 5 generates micro vibration under the action of the voltage feedback signal to offset the vibration amplitude of the partial voltage film layer 3, the fact that the luminous structure 4 is damaged due to the larger vibration amplitude is avoided, and the service life of a sounding display screen is prolonged.
The invention also provides a preparation method of the sounding display screen, which comprises the following steps:
s1: a substrate is provided.
S2: a light emitting structure is formed on the substrate.
S3: forming a piezoelectric isolation structure on the substrate, wherein the piezoelectric isolation structure is positioned on the side part of at least part of the light-emitting structure; the forming step of the piezoelectric isolation structure comprises the following steps: forming piezoelectric isolation columns on the substrate, wherein the piezoelectric isolation columns are positioned on the side parts of at least part of the light-emitting structures; and forming a second driving electrode connected with the piezoelectric isolating post.
S4: and a piezoelectric film layer is arranged on one side of the piezoelectric isolation structure, which is away from the substrate.
S5: and a sounding film layer is arranged on the surface of one side of the piezoelectric film layer, which is away from the substrate.
S6: forming a second driving module on the substrate, the second driving module including: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit is suitable for outputting the voltage feedback signal to the second driving electrode.
The description of the substrate refers to the content of the foregoing embodiments and will not be described in detail.
The description of the light emitting structure is made with reference to the content of the foregoing embodiment, and will not be described in detail.
The description of the piezoelectric film layer refers to the content of the foregoing embodiment, and will not be described in detail.
The sound-emitting film layer will be described in detail with reference to the foregoing embodiments.
In one embodiment, a plurality of spaced strip-shaped fifth electrodes are formed on the substrate before the light emitting structure is formed; the light emitting structure is positioned on a partial region of the fifth electrode; after the light-emitting structure is formed, a plurality of strip-shaped sixth electrodes are formed on one side, facing away from the fifth electrodes, of the light-emitting structure, the extending direction of the sixth electrodes is perpendicular to the extending direction of the fifth electrodes, and the light-emitting structure is located between part of the fifth electrodes and part of the sixth electrodes. Correspondingly, the sounding display screen is a sounding PMOLED display screen. In this case, after forming the fifth electrode, the light emitting structure, and the sixth electrode, forming a piezoelectric isolation structure on the substrate, the piezoelectric isolation structure being located at a side portion of the sixth electrode and spaced apart from the sixth electrode, the piezoelectric isolation structure also being located on a portion of the fifth electrode at the side portion of the light emitting structure; further, before the piezoelectric isolation structure, the method further includes: forming an insulating layer on a part of the fifth electrode at the side part of the light-emitting structure, and after forming a piezoelectric isolation structure, positioning the piezoelectric isolation structure between the part of the fifth electrode and the insulating layer, wherein the insulating layer electrically isolates the fifth electrode and the piezoelectric isolation structure to prevent the potential of the fifth electrode from being applied to the piezoelectric isolation column; after the piezoelectric isolation structure and the sixth electrode are formed, forming an encapsulation layer, wherein the encapsulation layer wraps the side wall of the light-emitting structure and the sixth electrode, in the process of forming the encapsulation layer, an isolation encapsulation layer is formed on the surface of one side of the piezoelectric isolation column, which is opposite to the substrate, and the isolation encapsulation layer is made of the same material as the encapsulation layer; forming a piezoelectric film layer after forming the encapsulation layer and isolating the encapsulation layer; after the piezoelectric film layer is formed, a sound generating film layer is formed.
In another embodiment, before forming the light emitting structure, forming a fifth electrode arranged in an array on the substrate; forming a pixel defining layer on the substrate, the pixel defining layer having a pixel opening therein, the pixel opening exposing the fifth electrode; forming a light emitting structure in the pixel opening on the fifth electrode; after the light-emitting structure is formed, a sixth electrode is formed on one side, facing away from the fifth electrode, of the light-emitting structure and the pixel defining layer, an isolation opening penetrating through the sixth electrode is formed in the sixth electrode, the isolation opening is used for defining the position of the piezoelectric isolation column, and the isolation opening is located on the side portion of the light-emitting structure. Correspondingly, the sounding display screen is a sounding AMOLED display screen. In this case, after forming the fifth electrode, the light emitting structure, and the sixth electrode, a piezoelectric isolation structure is formed on the substrate, specifically, a piezoelectric isolation structure is formed on a part of the pixel defining layer, preferably, the piezoelectric isolation structure penetrates the sixth electrode and is spaced apart from the sixth electrode, specifically, the piezoelectric isolation structure penetrates the isolation opening; after the piezoelectric isolation structure and the sixth electrode are formed, an encapsulation layer is formed, the encapsulation layer covers the sixth electrode and exposes the piezoelectric isolation structure, in the process of forming the encapsulation layer, an isolation encapsulation layer is formed on the surface of one side of the piezoelectric isolation column, which faces away from the substrate, the material of the isolation encapsulation layer is the same as that of the encapsulation layer, and the encapsulation layer and the isolation encapsulation layer are spaced apart and are not continuous due to the fact that the height of the piezoelectric isolation structure is larger than the total thickness of the light emitting structure, the fifth electrode and the sixth electrode and have a certain difference value. Further, the method further comprises the following steps: after forming the light emitting structure, an insulating layer is formed on a part of the substrate, specifically, an insulating layer is formed on the part of the pixel defining layer, which may be formed in the isolation opening after forming the sixth electrode, or an insulating layer is formed on a part of the pixel defining layer before forming the sixth electrode, and after forming the piezoelectric isolating structure, the piezoelectric isolating structure is located on the insulating layer.
In this embodiment, the method of forming the piezoelectric film layer includes: a plurality of spaced sub-piezoelectric film layers are arranged on one side, facing away from the substrate, of the piezoelectric isolation structure, and the sub-piezoelectric film layers are arrayed; the number of the piezoelectric isolation structures is a plurality of, and the piezoelectric isolation structures are positioned below the sub-piezoelectric film layers. The sounding film layer is of a whole-surface structure.
In other embodiments, the piezoelectric film layer and the sound emitting film layer are both of a full-face structure.
The invention also provides a working method of the sounding display screen, which comprises the following steps: driving the piezoelectric film layer to vibrate, wherein the piezoelectric film layer drives the sounding film layer to sound; the piezoelectric isolating column outputs a voltage output signal to the data processing unit after being vibrated by the piezoelectric film layer; the data processing unit processes the voltage output signal and outputs a voltage feedback signal to the data feedback unit, wherein the voltage feedback signal and the voltage output signal are opposite; the data feedback unit outputs a voltage feedback signal to the second driving electrode.
The invention further provides a display device, which comprises the sounding display screen and prolongs the service life of the display device.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (28)
1. A sound emitting display screen, comprising:
a substrate;
the sounding film layer is arranged opposite to the substrate;
the piezoelectric film layer is positioned on the surface of the sounding film layer, facing one side of the substrate;
the light-emitting structure is positioned on one side surface of the substrate facing the piezoelectric film layer;
the piezoelectric isolation structure is positioned between the substrate and the piezoelectric film layer and at the side part of at least part of the light-emitting structure, and comprises a piezoelectric isolation column and a second driving electrode connected with the piezoelectric isolation column;
a second driving module on the substrate, the second driving module comprising: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit is suitable for outputting the voltage feedback signal to the second driving electrode.
2. The sound-emitting display screen of claim 1, wherein the piezoelectric film layer comprises a plurality of spaced sub-piezoelectric film layers, the plurality of sub-piezoelectric film layers being arranged in an array; the number of the piezoelectric isolation structures is a plurality of, and the piezoelectric isolation structures are positioned below the sub-piezoelectric film layers.
3. The sound emitting display of claim 2, wherein one or several of the light emitting structures are located between each of the sub-piezoelectric film layers and the substrate.
4. The sound emitting display screen of claim 2, wherein the sound emitting membrane layer is of a full-face structure.
5. The sound-emitting display screen of claim 1, wherein the piezoelectric film layer is of a full-face structure; the sounding film layer is of a whole-surface structure.
6. The sound emitting display screen of claim 1, wherein the orthographic projection of the piezoelectric film layer on the surface of the substrate falls within the orthographic projection of the sound emitting film layer on the surface of the substrate.
7. The sound emitting display screen of claim 1, wherein the sound emitting display screen further comprises: the support frame is positioned on the edge of the substrate and supports the sounding film layer and the substrate.
8. The sound emitting display screen of claim 1, further comprising: the first electrode is positioned on the surface of the piezoelectric film layer facing to one side of the sounding film layer, and the second electrode is positioned on the surface of the piezoelectric film layer facing to one side of the substrate.
9. The sound emitting display screen of claim 8, further comprising: and the first driving module is positioned on the substrate and is electrically connected with the first electrode and the second electrode.
10. The sound emitting display of claim 1, wherein the piezoelectric film layer comprises a barium titanate ceramic film layer or a lead zirconate titanate ceramic film layer.
11. The sound emitting display screen of claim 1, wherein the piezoelectric film layer has a thickness of 50 μm to 400 μm.
12. The sound emitting display screen of claim 1, wherein the sound emitting membrane layer comprises a polyimide sound emitting membrane layer.
13. The sound emitting display screen of claim 1, wherein the sound emitting film layer has a thickness of 100 μm to 300 μm.
14. The sound emitting display screen of claim 1, wherein the second drive electrode comprises: a third electrode located on a sidewall of the piezoelectric isolating post; a fourth electrode located between the piezoelectric film layer and the piezoelectric isolating post; the second driving module is electrically connected with the third electrode and the fourth electrode.
15. The sound emitting display screen of claim 1, wherein the piezoelectric spacer comprises a barium titanate ceramic spacer or a lead zirconate titanate ceramic spacer.
16. The sound-emitting display screen according to claim 1, wherein the distance between adjacent piezoelectric isolation structures is 50 μm to 200 μm, the height of the piezoelectric isolation column is 100 μm to 150 μm, and the width of the piezoelectric isolation column is 5 μm to 15 μm.
17. The sound emitting display screen of claim 14, wherein the sound emitting display screen further comprises: and the isolation packaging layer is positioned between the piezoelectric film layer and the fourth electrode.
18. The sound-producing display screen according to claim 1, wherein a surface of one side of the substrate facing the piezoelectric film layer is provided with a plurality of strip-shaped fifth electrodes at intervals, one side of the fifth electrode facing away from the substrate is provided with a plurality of strip-shaped sixth electrodes at intervals, and the extending direction of the sixth electrodes is perpendicular to the extending direction of the fifth electrodes; the light emitting structure is positioned between a part of the fifth electrode and a part of the sixth electrode; the piezoelectric isolation structure is located at a side of the sixth electrode and is spaced apart from the sixth electrode.
19. The sound emitting display screen of claim 18, further comprising: and the piezoelectric isolation structure faces to the insulating layer on one side surface of the fifth electrode.
20. The sound emitting display screen of claim 18, further comprising: and the packaging layer coats the side wall of the light-emitting structure and the sixth electrode.
21. The sound-producing display screen according to claim 1, wherein a fifth electrode arranged in an array is arranged on a surface of one side of the substrate facing the piezoelectric film layer; the substrate is provided with a pixel limiting layer, the pixel limiting layer is provided with a pixel opening, and the pixel opening is positioned on the fifth electrode; the light emitting structure is positioned in the pixel opening; and a sixth electrode is arranged on one side of the fifth electrode, which is away from the substrate.
22. The sound emitting display screen of claim 21, wherein the piezoelectric isolation structure is located on the pixel defining layer on a side of the light emitting structure and is spaced apart from the sixth electrode.
23. The sound emitting display screen of claim 21, wherein the piezoelectric isolating structure extends through and is spaced apart from the sixth electrode.
24. The sound emitting display screen of claim 21, further comprising: and the insulating layer is positioned on one side surface of the piezoelectric isolation structure, which faces the substrate.
25. The sound emitting display screen of claim 21, further comprising: and the packaging layer covers the sixth electrode and exposes the piezoelectric isolation structure.
26. The preparation method of the sounding display screen is characterized by comprising the following steps of:
providing a substrate;
forming a light emitting structure on the substrate;
forming a piezoelectric isolation structure on the substrate, wherein the piezoelectric isolation structure is positioned on the side part of at least part of the light-emitting structure; the forming step of the piezoelectric isolation structure comprises the following steps: forming piezoelectric isolation columns on the substrate, wherein the piezoelectric isolation columns are positioned on the side parts of at least part of the light-emitting structures; forming a second driving electrode connected with the piezoelectric isolating post;
a piezoelectric film layer is arranged on one side of the piezoelectric isolation structure, which is away from the substrate;
a sounding film layer is arranged on the surface of one side of the piezoelectric film layer, which is away from the substrate;
forming a second driving module on the substrate, the second driving module including: the piezoelectric isolating column comprises a data receiving unit, a data processing unit and a data feedback unit, wherein the data receiving unit is suitable for receiving a voltage output signal of the piezoelectric isolating column after being vibrated by the piezoelectric film layer, the data processing unit is suitable for processing the voltage output signal and outputting a voltage feedback signal to the data feedback unit, the voltage feedback signal is opposite to the voltage output signal, and the data feedback unit is suitable for outputting the voltage feedback signal to the second driving electrode.
27. A method of operating a sound emitting display according to any one of claims 1 to 25, comprising:
driving the piezoelectric film layer to vibrate, wherein the piezoelectric film layer drives the sounding film layer to sound;
the piezoelectric isolating column outputs a voltage output signal to the data processing unit after being vibrated by the piezoelectric film layer;
the data processing unit processes the voltage output signal and outputs a voltage feedback signal to the data feedback unit, wherein the voltage feedback signal and the voltage output signal are opposite;
the data feedback unit outputs a voltage feedback signal to the second driving electrode.
28. A display device, comprising: a sound emitting display as claimed in any one of claims 1 to 25.
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