CN114627752B - Display panel and display device thereof - Google Patents
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- CN114627752B CN114627752B CN202011459725.9A CN202011459725A CN114627752B CN 114627752 B CN114627752 B CN 114627752B CN 202011459725 A CN202011459725 A CN 202011459725A CN 114627752 B CN114627752 B CN 114627752B
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
Abstract
The patent refers to the field of 'pictorial communication,'. The display panel includes: the display screen and set up in the sound production excitation mechanism of display screen one side of keeping away from the display side, sound production excitation mechanism is including the magnetic field generation unit that is used for producing alternating magnetic field and be used for producing the magnetostriction unit of vibration under the alternating magnetic field effect, magnetostriction unit is connected with the display screen to set up to can transmit the vibration to the display screen, realize the screen sound production. The sound-producing excitation mechanism is arranged on one side, far away from the display side, of the display screen, and comprises a magnetic field generating unit used for generating an alternating magnetic field and a magnetostriction unit used for generating vibration under the action of the alternating magnetic field, and the magnetostriction unit can transmit the vibration to the display screen to achieve screen sound production.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device thereof.
Background
With the development of the full-screen technology, the screen sounding is widely applied with the advantage that a receiver sounding hole is not required to be arranged on the front surface of the display panel. Conventional screen or panel sound generators typically include one or more exciters. The exciter is mounted on a screen or a panel for sounding or directly on a fixed frame of an electronic device such as a mobile phone. The exciter generates certain deformation or displacement, so that the screen or the panel is driven to generate deformation or displacement, and the sound radiation is realized.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
An embodiment of the present invention provides a display panel including: the display screen and set up in the sound production excitation mechanism of display screen one side of keeping away from the display side, sound production excitation mechanism is including the magnetic field generation unit that is used for producing alternating magnetic field and be used for producing the magnetostriction unit of vibration under the alternating magnetic field effect, magnetostriction unit is connected with the display screen to set up to can transmit the vibration to the display screen, realize the screen sound production.
In some exemplary embodiments, the magnetic field generating unit includes a coil sleeved outside the magnetostrictive unit, the magnetostrictive unit stretches under the excitation of an alternating magnetic field formed at the center of the coil, and a first end of the magnetostrictive unit in the stretching direction is connected with the display screen.
In some exemplary embodiments, the acoustic excitation mechanism includes a plurality of coils and a set of magnetostrictive elements, wherein,
the magnetostriction units in the plurality of coils and magnetostriction unit groups act in the same phase; or,
the plurality of coils and magnetostrictive element groups comprise a first coil and magnetostrictive element group in which the magnetostrictive element acts in a first phase and a second coil and magnetostrictive element group in which the magnetostrictive element acts in a second phase, and the first phase and the second phase are different phases.
In some exemplary embodiments, the first phase and the second phase are opposite, or 90 ° out of phase.
In some exemplary embodiments, the sound excitation mechanism further includes a first vibration transfer unit disposed between the first end of the magnetostrictive unit and the display screen.
In some exemplary embodiments, the sounding excitation mechanism further includes a second vibration transmission unit and a sound amplifying shell, the second vibration transmission unit is disposed at a second end of the magnetostrictive unit opposite to the first end in the telescopic direction, the sound amplifying shell encloses a resonant cavity, a mounting opening communicated with the resonant cavity is disposed on the sound amplifying shell, and the second vibration transmission unit is embedded in the mounting opening.
In some exemplary embodiments, a plurality of coils and magnetostrictive unit sets are disposed on the same second vibration transmitting unit; or,
the second vibration transmission unit comprises a plurality of second vibration transmission units, and the second vibration transmission units at least correspond to one coil and magnetostriction unit group.
In some exemplary embodiments, the resonant cavities are in one-to-one correspondence with the mounting ports; or the resonant cavity corresponds to a plurality of mounting ports.
In some exemplary embodiments, the depth of the resonant cavity is one half of the wavelength of the medium-high frequency sound wave in a direction parallel to the telescoping direction of the magnetostrictive unit.
In some exemplary embodiments, the sound amplifying shell comprises a shell bottom and a shell cover which are oppositely arranged, a shell wall connecting the shell bottom and the edge of the shell cover, and a partition plate connecting the shell bottom and the shell cover and positioned on the inner side of the shell wall, wherein the partition plate divides a space surrounded by the shell bottom, the shell cover and the shell wall into a plurality of resonant cavities, and the mounting opening is arranged on the shell cover.
In some exemplary embodiments, the magnetic field generating unit includes a coil and a static bias magnetic field generating unit, the coil is sleeved on the outer side of the magnetostrictive unit, the axial direction of the coil is parallel to the plane where the display screen is located, one side of the magnetostrictive unit close to the display screen is connected with the display screen, the direction of the static bias magnetic field generated by the static bias magnetic field generating unit is intersected with the direction of the alternating magnetic field formed by the center of the coil, and the magnetostrictive unit generates bending vibration under the action of the alternating magnetic field and the static bias magnetic field.
In some exemplary embodiments, the static bias magnetic field generating unit includes a permanent magnet having S and N poles arranged along an axial direction of the coil; or alternatively, the first and second heat exchangers may be,
the static bias magnetic field generating unit is arranged as a coil cluster which is arranged in a straight line, and the arrangement direction of the coil cluster is parallel to the axial direction of the coil.
In some exemplary embodiments, a display screen includes a substrate having a cavity disposed thereon and a pixel unit disposed on the substrate, and a sound excitation mechanism disposed within the cavity.
In some exemplary embodiments, the display panel is a tiled display panel, and the cavity penetrates the substrate along an axial direction of the coil.
The embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment.
The embodiment of the invention provides a display panel and a display device thereof, wherein a sounding excitation mechanism is arranged on one side of a display screen far away from a display side, and comprises a magnetic field generating unit for generating an alternating magnetic field and a magnetostriction unit for generating vibration under the action of the alternating magnetic field, and the magnetostriction unit can transmit the vibration to the display screen to realize sounding of the screen.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a block diagram of a display panel according to an exemplary embodiment of the present invention;
fig. 2 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 3 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 4 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 5 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
FIG. 6a is a two-dimensional axisymmetric magnetic field simulation cross-sectional view of a display panel according to an exemplary embodiment of the present invention;
FIG. 6b is a graph showing the three-dimensional magnetic field profile formed after the rotation of FIG. 6 a;
FIG. 6c is a simulated view of deformation of a display panel during sound production in accordance with an exemplary embodiment of the present invention;
fig. 6d is a sound field distribution plan view of a display panel according to an exemplary embodiment of the present invention;
FIG. 6e is a cross-sectional view of a sound field distribution of a display device according to an exemplary embodiment of the present invention;
fig. 7 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 8 is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 9a is a block diagram of another display panel according to an exemplary embodiment of the present invention;
fig. 9b is a cross-sectional view of the display panel shown in fig. 9 a.
Description of the reference numerals
1-a display panel;
10-sounding excitation mechanism; 11-coils; 12-magnetostriction units; 13-a first vibration transmission unit; 14-a second vibration transmission unit; 15-a sound amplifying shell; 151-a resonant cavity; 152-mounting port; 153-bottom of the shell; 154-a cover; 155-a shell wall; 156-separator; 16-an electrostatic bias magnetic field generating unit; 17-couplant;
20-displaying a screen; 21-a substrate; 211-cavities; 22-pixel cell.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "one side", "the other side", "one end", "the other end", "the side", "the opposite", "four corners", "the periphery", "the" mouth "character structure", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus are not to be construed as limiting the present invention.
In the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. 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.
With the development of the full-screen technology, the screen sounding is widely applied with the advantage that a receiver sounding hole is not required to be arranged on the front surface of the display panel. Conventional screen or panel sound generators typically include one or more exciters. The exciter is mounted on a screen or a panel for sounding or directly on a fixed frame of an electronic device such as a mobile phone. The exciter generates certain deformation or displacement, so that the screen or the panel is driven to generate deformation or displacement, and the sound radiation is realized. At present, the exciter mainly adopts an electromagnetic transducer structure, so that the structural design of the display panel is limited, and the design requirement of a screen sounding product cannot be met.
The embodiment of the invention provides a display panel and a display device thereof. The display panel includes: the display screen and set up in the sound production excitation mechanism of display screen one side of keeping away from the display side, sound production excitation mechanism is including the magnetic field generation unit that is used for producing alternating magnetic field and be used for producing the magnetostriction unit of vibration under the alternating magnetic field effect, magnetostriction unit is connected with the display screen to set up to can transmit the vibration to the display screen, realize the screen sound production.
The embodiment of the invention provides a display panel and a display device thereof, wherein a sounding excitation mechanism is arranged on one side of a display screen far away from a display side, and comprises a magnetic field generating unit for generating an alternating magnetic field and a magnetostriction unit for generating vibration under the action of the alternating magnetic field, and the magnetostriction unit can transmit the vibration to the display screen to realize sounding of the screen, so that the design selectivity and flexibility of a sounding structure of the screen are improved.
The technical scheme of the display panel according to the exemplary embodiment of the present invention is exemplarily described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a display panel according to an exemplary embodiment of the present invention. In some exemplary embodiments, as shown in fig. 1, the display panel 1 includes a sound excitation mechanism 10 and a display screen 20, the sound excitation mechanism 10 being disposed on a side of the display screen 20 remote from the display side. The acoustic excitation mechanism 10 includes a magnetic field generating unit for generating an alternating magnetic field and a magnetostrictive unit 12 for generating vibrations under the action of the alternating magnetic field. The magnetic field generating unit is provided as a coil 11, and the coil 11 is sleeved outside the magnetostrictive unit 12. When alternating current is supplied to the coil 11, an alternating magnetic field is formed at the center of the coil 11, the magnetostrictive unit 12 expands and contracts in the alternating magnetic field direction under excitation of the alternating magnetic field formed at the center of the coil 11, and vibration is generated, and the alternating magnetic field direction formed at the center of the coil 11 is substantially equal to the axial direction X of the coil 11. The magnetostrictive unit 12 is connected at a first end in the telescopic direction to the display screen 20 to transmit vibration to the display screen 20, and the display screen 20 functions as a diaphragm to realize screen sound production.
The exemplary embodiment of the invention provides a display panel 1, by arranging a sounding excitation mechanism 10 on one side of a display screen 20 far away from a display side, the sounding excitation mechanism 10 comprises a coil 11 for generating an alternating magnetic field and a magnetostrictive unit 12 for generating vibration under the action of the alternating magnetic field, the coil 11 is sleeved outside the magnetostrictive unit 12, the magnetostrictive unit 12 stretches under the action of the alternating magnetic field formed by the center of the coil 11, and since a first end of the magnetostrictive unit 12 in the stretching direction is connected with the display screen 20, the magnetostrictive unit 12 can transmit vibration to the display screen 20, thereby realizing another screen sounding structure and improving the selectivity and flexibility of the screen sounding structure design.
In some exemplary embodiments, as shown in FIG. 1, the acoustic excitation mechanism 10 includes a plurality of coils 11 and a set of magnetostrictive units 12. For example, 3, 4 or 8, are not limited according to the sounding position and size setting of the display screen. The plurality of coils 11 and the magnetostrictive unit 12 group collectively drive the display screen 20 to vibrate and sound according to sound production requirements.
In an exemplary embodiment, as shown in fig. 1, the magnetostrictive units 12 in the plurality of coils 11 and magnetostrictive unit 12 groups act in the same phase, and thus the radiation of the acoustic wave can be further enhanced. Wherein the plurality of coils 11 and the coils 11 of the magnetostrictive unit 12 set are connected in parallel or in series. The same phase of the plurality of coils 11 and the magnetostrictive units 12 of the magnetostrictive unit 12 group can be understood as that the plurality of magnetostrictive units 12 are simultaneously telescoping, and at the same time, the amplitudes and directions of the telescoping of the plurality of magnetostrictive units 12 are the same. The same phase of the magnetostrictive units 12 of the plurality of coils 11 and the magnetostrictive unit 12 group can also be understood as the same phase of the alternating current flowing through the plurality of coils 11 and the coils 11 of the magnetostrictive unit 12 group.
Fig. 2 is a block diagram of another display panel according to an exemplary embodiment of the present invention. In another exemplary embodiment, as shown in fig. 2, the plurality of coils 11 and magnetostrictive unit 12 groups include a first coil 11 and magnetostrictive unit 12 group (e.g., first and third coil 11 and magnetostrictive unit 12 group from the left in fig. 2) in which magnetostrictive unit 12 operates in a first phase, and a second coil 11 and magnetostrictive unit 12 group (e.g., second coil 11 and magnetostrictive unit 12 group from the left in fig. 2) in which magnetostrictive unit 12 operates in a second phase, the first phase and the second phase being different phases, for example, the first phase and the second phase being opposite, or the phase difference being 90 °, thereby realizing bending vibration of display screen 20. Wherein bending vibration can be understood as forming a wave-like shape at the same timing with the plane in which the initial display screen (unvoiced state) is located as a reference plane, the position of the display screen 20 corresponding to the first coil 11 and the magnetostrictive unit 12 group and the position corresponding to the second coil 11 and the magnetostrictive unit 12 group being not at the same height. The first phase and the second phase being opposite, or 90 ° out of phase, is also understood to mean that the alternating current flowing through the first coil 11 and the coil 11 of the magnetostrictive unit 12 set is opposite in phase, or 90 ° out of phase, with the alternating current flowing through the second coil 11 and the coil 11 of the magnetostrictive unit 12 set. In an exemplary embodiment, the coils 11 and the magnetostrictive unit 12 groups are arranged in a row or column, and the first coil 11 and the magnetostrictive unit 12 group and the second coil 11 and the magnetostrictive unit 12 group are alternately arranged. The bending vibration can widen the sound frequency of the screen sounding, and improve the fidelity of the screen sounding.
In some exemplary embodiments, the first end of magnetostrictive element 12 may be directly coupled to display screen 20 in a manner that may be adhesive.
In other exemplary embodiments, as shown in fig. 1, the acoustic excitation mechanism 10 further includes a first vibration transmission unit 13, the first vibration transmission unit 13 being disposed between the first end of the magnetostrictive unit 12 and the display screen 20, the first end of the magnetostrictive unit 12 being indirectly connected to the display screen 20. The first end of the magnetostrictive element 12, the first vibration transmitting element 13 and the display screen 20 may be bonded. In an example, the coil 11 may also be connected to the first vibration transmitting unit 13, and the orthographic projection of the coil 11 on the display screen 20 is within the range of the orthographic projection of the first vibration transmitting unit 13 on the display screen 20.
In some exemplary embodiments, as shown in fig. 1, the sounding excitation mechanism 10 further includes a second vibration transmission unit 14 and a sound amplifying shell 15, the second vibration transmission unit 14 is disposed at a second end of the magnetostrictive unit 12 opposite to the first end in the telescopic direction, the sound amplifying shell 15 encloses a resonant cavity 151, a mounting hole 152 communicating with the resonant cavity 151 is disposed on the sound amplifying shell 15, and the second vibration transmission unit 14 is embedded in the mounting hole 152. When the first end and the second end of the magnetostrictive unit 12 are close to or far away from each other, the first vibration transmission unit 13 and the second vibration transmission unit 14 can be driven to vibrate, the first vibration transmission unit 13 can transmit vibration to the display screen 20, the display screen 20 serves as a vibrating membrane to realize screen sounding, the second vibration transmission unit 14 generates sound waves after vibrating, the sound waves are transmitted into the resonant cavity 151 and are sounded and resonated in the resonant cavity 151, and the resonance sound waves are transmitted to the display screen 20 under the reflection of the sound amplifying shell 15, so that the sounding of the display screen 20 is enhanced.
In some exemplary embodiments, sound is divided into low frequencies (below 1000 Hz), medium frequencies (between 1000Hz and 2500 Hz), and high frequencies (above 2500 Hz), wherein the depth H of the resonant cavity 151 is one half the wavelength of the medium and high frequency sound waves in a telescoping direction parallel to the magnetostrictive unit 12, as shown in fig. 1. Thus, the sound waves with medium and high frequencies resonate in the resonant cavity 151, and the screen sounding with medium and high frequencies is improved.
In some exemplary embodiments, as shown in fig. 1, the sound amplifying case 15 includes a case bottom 153 and a case cover 154 disposed opposite to each other, a case wall 155 connecting edges of the case bottom 153 and the case cover 154, and a partition 156 connecting the case bottom 153 and the case cover 154 and located inside the case wall 155, the partition 156 dividing a space surrounded by the case bottom 153, the case cover 154, and the case wall 155 into a plurality of resonance chambers 151, and the mounting port 152 is disposed on the case cover 154 and corresponds to the resonance chambers 151. The shape of the resonant cavity 151 may be a rectangular body or a cylindrical body, which is not limited herein.
In some exemplary embodiments, the plurality of coils 11 and the magnetostrictive unit 12 are disposed on the same second vibration transmitting unit 14, that is, the acoustic excitation mechanism 10 includes one second vibration transmitting unit 14, and the second ends of the magnetostrictive units 12 of the plurality of coils 11 and the magnetostrictive unit 12 are each connected to the same second vibration transmitting unit 14.
Fig. 3 is a structural view of another display panel according to an exemplary embodiment of the present invention, and fig. 4 is a structural view of another display panel according to an exemplary embodiment of the present invention. In other exemplary embodiments, the second vibration transmitting unit 14 includes a plurality of second vibration transmitting units 14 corresponding to at least one coil 11 and magnetostrictive unit 12 group. In one example, as shown in fig. 1, each second vibration transmitting unit 14 corresponds to one coil 11 and magnetostrictive unit 12 group, and in another example, as shown in fig. 3 and 4, each second vibration transmitting unit 14 corresponds to a plurality of coil 11 and magnetostrictive unit 12 groups, for example, each second vibration transmitting unit 14 may correspond to 2, 3, or 4 coil 11 and magnetostrictive unit 12 groups. As shown in fig. 3, the plurality of coils 11 and the magnetostrictive elements 12 in the magnetostrictive element 12 group corresponding to the same second vibration transmitting element 14 may operate in the same phase. As shown in fig. 4, the plurality of coils 11 and magnetostrictive units 12 corresponding to the same second vibration transmitting unit 14 include a first coil 11 and magnetostrictive unit 12 group (such as a first coil 11 and magnetostrictive unit 12 group from the left in fig. 4) in which the magnetostrictive unit 12 operates in a first phase, and a second coil 11 and magnetostrictive unit 12 group (such as a second coil 11 and magnetostrictive unit 12 group from the left in fig. 4) in which the magnetostrictive unit 12 operates in a second phase, the first phase and the second phase being different phases, for example, the first phase and the second phase being opposite, or the phase difference being 90 °.
In some exemplary embodiments, the mounting port 152 corresponds to the second vibration transmitting unit 14. In one example, as shown in fig. 1-4, the mounting ports 152 are in one-to-one correspondence with the resonant cavities 151. In another example, as shown in fig. 5, the resonant cavity 151 corresponds to a plurality of mounting ports 152. Fig. 5 is a block diagram of another display panel according to an exemplary embodiment of the present invention.
In some exemplary embodiments, the magnetostrictive element 12 material may be terbium dysprosium iron alloy (Terfenol-D). The Terfenol-D has high energy density, and can be converted into larger output displacement by using small input power, so that the size and quality of the product can be reduced. The magnetostrictive element 12 has a rod shape, for example, a cylinder or a rectangular parallelepiped. The first vibration transmission unit 13 and the second vibration transmission unit 14 are sheet-shaped. The materials of the first and second vibration transfer units 13 and 14 include soft iron. The thickness of the first vibration transfer unit 13 and the second vibration transfer unit 14 is between 2 mm and 8 mm, for example 5 mm. After alternating current is conducted to the surrounding coil 11, an alternating magnetic field is generated, and the alternating magnetic field can form a complete magnetic circuit through the soft iron, the magnetostrictive unit 12 and the outside air. Soft iron is iron that is easily magnetized when placed in a magnetic field and demagnetized immediately after being taken out of the magnetic field. Soft iron is adopted as the material of the first vibration transmission unit 13 and the second vibration transmission unit 14, so that a stable alternating magnetic field is formed, the telescopic stability of the magnetostrictive unit 12 is enhanced, and the sounding quality is improved. The material of the sound-amplifying case 15 includes at least one of glass, quartz, and resin. The resin includes polymethyl methacrylate (PMMA), polycarbonate (PC), or polyethylene terephthalate (PET).
In some exemplary embodiments, display screen 20 includes a rigid display screen and a flexible display screen. The substrate of the rigid display screen may be glass or quartz, and the substrate of the flexible display screen may be Polyimide (PI) or cellulose acetate (TAC). The display screen 20 may be an Organic Light-Emitting Diode (OLED) display screen or a liquid crystal display screen (Liquid Crystal Display, LCD), and thus the display screen 202 includes pixel units disposed on a substrate.
Fig. 6a is a two-dimensional axisymmetric magnetic field simulation cross-sectional view of a display panel according to an exemplary embodiment of the present invention, fig. 6b is a three-dimensional magnetic field distribution map formed by rotation of fig. 6a, fig. 6c is a deformation simulation map when the display panel according to an exemplary embodiment of the present invention is sounded, fig. 6d is a sound field distribution plan view of the display panel according to an exemplary embodiment of the present invention, and fig. 6e is a cross-sectional view of sound field distribution of a display device according to an exemplary embodiment of the present invention, wherein an X direction, a Y direction, and a Z direction are perpendicular to each other, and the Z direction is parallel to a telescopic direction of the magnetostrictive unit 12. In some exemplary embodiments, the first vibration transmission unit 13 and the second vibration transmission unit 14 are made of soft iron, the magnetostrictive unit 12 is made of Terfenol-D, the COMSOL simulation display device is used for transmitting sound waves, and in the 2145Hz working state, the magnetic field distribution patterns formed by the first vibration transmission unit 13, the second vibration transmission unit 14 and the coil 11 are formed, as shown in fig. 6a and 6b, the coil 11, the first vibration transmission unit 13 and the second vibration transmission unit 14 form a complete magnetic circuit, the magnetic flux density modes are mainly concentrated on the surface of the magnetostrictive unit 12, and the magnetic flux density modes gradually decrease in the direction perpendicular to the telescoping direction of the magnetostrictive unit 12 and away from the coil 11. As shown in fig. 6c, in the sounding state of the display screen 20, the stress of the display panel 1 is mainly concentrated on the surface of the magnetostrictive unit 12 and the display screen 20 and the second vibration transmission unit 14, wherein the stress of the surface of the magnetostrictive unit 12 is larger than the stress of the display screen 20 and the second vibration transmission unit 14, and since the stress is in a proportional relationship with the deformation, the deformation of the display panel is mainly concentrated on the surface of the magnetostrictive unit 12, the display screen 20 and the second vibration transmission unit 14, that is, the telescopic action of the magnetostrictive unit 12 is transmitted to the display screen 20 and the second vibration transmission unit 14, thereby realizing the sounding of the display screen 20. As shown in fig. 6D, the sound field pressure of the display panel at the Terfenol-D position is strongest and gradually weakens in a direction perpendicular to the extension and contraction direction of the magnetostrictive unit 12 and away from the coil 11, corresponding to the stress distribution in the sound-producing state of the display panel. As is apparent from fig. 6e, after the sound wave generated by the vibration of the second vibration transmitting unit 14 is transmitted to the resonant cavity 151, resonance is generated, the sound field pressure is remarkably increased, and thus the screen sound production is boosted.
Fig. 7 is a block diagram of another display panel according to an exemplary embodiment of the present invention. In some exemplary embodiments, as shown in fig. 7, the magnetic field generating unit includes a coil 11 and a static bias magnetic field generating unit 16, the coil 11 is sleeved on the outer side of the magnetostrictive unit 12, an axial direction X of the coil 11 is parallel to a plane where the display screen 20 is located, one side of the magnetostrictive unit 12 near the display screen 20 is connected with the display screen 20, a direction of the static bias magnetic field generated by the static bias magnetic field generating unit 16 intersects with a direction of an alternating magnetic field formed by a center of the coil 11, and the magnetostrictive unit 12 generates bending vibration under the action of the alternating magnetic field generated by the center of the coil 11 and the static bias magnetic field generated by the static bias magnetic field generating unit 16. The bending vibration is transmitted to the display screen 20, driving the display screen 20 to vibrate and sound outwards. In an example, the alternating magnetic field generated at the center of the coil 11 is tangential to the static bias magnetic field generated by the static bias magnetic field generating unit 16.
In some exemplary embodiments, as shown in fig. 7, the static bias magnetic field generating unit 16 is provided as a permanent magnet whose S-pole and N-pole are aligned along the axial direction X of the coil 11.
In some exemplary embodiments, as shown in fig. 7, the magnetostrictive unit 12 is filled with a couplant 17 between the side near the display screen 20 and the display screen 20. That is, the magnetostrictive unit 12 is bonded to the display screen 20 through the couplant 17. The bending vibration is transmitted to the display screen 20 through the couplant 17.
Fig. 8 is a block diagram of another display panel according to an exemplary embodiment of the present invention. In some exemplary embodiments, the static bias magnetic field generating unit 16 is provided as a cluster of coils arranged in a straight line, with sub-coils of the cluster of coils tiled and arranged in a direction parallel to the axial direction X of the coils 11.
Fig. 9a is a structural view of another display panel according to an exemplary embodiment of the present invention, and fig. 9b is a sectional view of the display panel shown in fig. 9 a. In some exemplary embodiments, the display screen 20 includes a substrate 21 and a pixel unit 22 disposed on the substrate 21, a cavity 211 is disposed on the substrate 21, the sounding excitation mechanism 10 is disposed in the cavity 211, and the cavity 211 also provides space for vibration of the magnetostrictive unit 12. In one example, the display panel 1 is a tiled display panel, and the cavity 211 penetrates the substrate 21 along the axial direction X of the coil 11. In an example, a flexible substrate may be disposed between the substrate 21 and the pixel unit 22, and the pixel unit 22 includes a display driving circuit and a display unit disposed on the flexible substrate.
The embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment. The display device comprises at least one of a mobile phone, a notebook computer, a tablet personal computer, electronic paper and an advertisement display screen.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.
Claims (12)
1. A display panel, comprising: the display screen and the sounding excitation mechanism are arranged on one side of the display screen far away from the display side, the sounding excitation mechanism comprises a magnetic field generation unit for generating an alternating magnetic field and a magnetostriction unit for generating vibration under the action of the alternating magnetic field, and the magnetostriction unit is connected with the display screen and is arranged to be capable of transmitting the vibration to the display screen so as to realize sounding of the screen;
the magnetic field generation unit comprises a coil sleeved on the outer side of the magnetostriction unit, the magnetostriction unit stretches under the excitation of an alternating magnetic field formed at the center of the coil, and the first end of the magnetostriction unit in the stretching direction is connected with the display screen;
the sounding excitation mechanism further comprises a first vibration transmission unit, a second vibration transmission unit and a sound expansion shell; the first vibration transmission unit is arranged between the first end of the magnetostriction unit and the display screen; the second vibration transmission unit is arranged at a second end of the magnetostrictive unit opposite to the first end in the telescopic direction, the sound amplifying shell encloses a resonant cavity, a mounting opening communicated with the resonant cavity is formed in the sound amplifying shell, and the second vibration transmission unit is embedded into the mounting opening.
2. The display panel of claim 1, wherein: the sounding excitation mechanism comprises a plurality of coils and a magnetostriction unit group, wherein,
the plurality of coils and the magnetostrictive units in the magnetostrictive unit group act in the same phase; or,
the plurality of coils and magnetostrictive element groups comprise a first coil and magnetostrictive element group in which the magnetostrictive element acts in a first phase and a second coil and magnetostrictive element group in which the magnetostrictive element acts in a second phase, wherein the first phase and the second phase are different phases.
3. The display panel of claim 2, wherein: the first phase and the second phase are opposite or 90 ° out of phase.
4. A display panel according to claim 2 or 3, characterized in that: the plurality of coils and the magnetostriction unit group are arranged on the same second vibration transmission unit; or,
the second vibration transmission units comprise a plurality of second vibration transmission units, and at least one second vibration transmission unit corresponds to one coil and magnetostriction unit group.
5. A display panel according to claim 2 or 3, characterized in that: the resonant cavities are in one-to-one correspondence with the mounting ports; or the resonant cavity corresponds to a plurality of mounting ports.
6. A display panel according to claim 2 or 3, characterized in that: in the telescopic direction parallel to the magnetostrictive unit, the depth of the resonant cavity is one half of the wavelength of the medium-high frequency sound wave.
7. A display panel according to claim 2 or 3, characterized in that: the sound amplifying shell comprises a shell bottom, a shell cover, shell walls, a baffle and a mounting opening, wherein the shell bottom and the shell cover are oppositely arranged, the shell walls are connected with the edges of the shell bottom and the shell cover, the baffle is connected with the shell bottom and is positioned on the inner side of the shell walls, the space enclosed by the shell bottom, the shell cover and the shell walls is divided into a plurality of resonant cavities by the baffle, and the mounting opening is formed in the shell cover.
8. The display panel of claim 1, wherein: the magnetic field generating unit comprises a coil and a static bias magnetic field generating unit, the coil is sleeved on the outer side of the magnetostriction unit, the axial direction of the coil is parallel to the plane where the display screen is located, one side, close to the display screen, of the magnetostriction unit is connected with the display screen, the direction of the static bias magnetic field generated by the static bias magnetic field generating unit is intersected with the direction of an alternating magnetic field formed by the center of the coil, and the magnetostriction unit generates bending vibration under the action of the alternating magnetic field and the static bias magnetic field.
9. The display panel of claim 8, wherein: the static bias magnetic field generating unit comprises a permanent magnet, wherein the S pole and the N pole of the permanent magnet are arranged along the axial direction of the coil; or alternatively, the first and second heat exchangers may be,
the static bias magnetic field generating unit is arranged into a coil cluster which is arranged in a straight line, sub-coils of the coil cluster are tiled, and the arrangement direction of the sub-coils is parallel to the axial direction of the coils.
10. The display panel of claim 8, wherein: the display screen comprises a substrate and pixel units arranged on the substrate, a cavity is formed in the substrate, and the sounding excitation mechanism is arranged in the cavity.
11. The display panel of claim 10, wherein: the display panel is a spliced display panel, and the cavity penetrates through the substrate along the axial direction of the coil.
12. A display device comprising a display panel according to any one of claims 1-11.
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| CN210805037U (en) * | 2019-12-19 | 2020-06-19 | 云谷（固安）科技有限公司 | Display device |
| CN111526452A (en) * | 2020-04-20 | 2020-08-11 | 海信视像科技股份有限公司 | Display device and sound-emitting screen |
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| JP2004350156A (en) * | 2003-05-23 | 2004-12-09 | Alps Electric Co Ltd | Display with sounding function |
| CN1843054A (en) * | 2003-06-02 | 2006-10-04 | Feonic公共有限公司 | Audio system |
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