WO2020253142A1 - Appareil d'affichage, substrat générateur de son et écran de projection - Google Patents

Appareil d'affichage, substrat générateur de son et écran de projection Download PDF

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Publication number
WO2020253142A1
WO2020253142A1 PCT/CN2019/123325 CN2019123325W WO2020253142A1 WO 2020253142 A1 WO2020253142 A1 WO 2020253142A1 CN 2019123325 W CN2019123325 W CN 2019123325W WO 2020253142 A1 WO2020253142 A1 WO 2020253142A1
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WO
WIPO (PCT)
Prior art keywords
exciter
vibration
sounding substrate
honeycomb
projection screen
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PCT/CN2019/123325
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English (en)
Chinese (zh)
Inventor
王海盈
杨建新
张婵
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海信视像科技股份有限公司
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Application filed by 海信视像科技股份有限公司 filed Critical 海信视像科技股份有限公司
Priority to CN201990001311.6U priority Critical patent/CN216848452U/zh
Publication of WO2020253142A1 publication Critical patent/WO2020253142A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/565—Screens allowing free passage of sound
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens

Definitions

  • This application relates to the field of flat panel display technology, and in particular to a display device, a sounding substrate and a projection screen.
  • the current projection screen usually includes a sounding substrate and an exciter (also called a transducer, which is a transducer that converts audio current into mechanical vibration) arranged on the sounding substrate.
  • the exciter can be used in audio Under current drive, the audio current is converted into mechanical vibration, and the sounding substrate is excited to produce multi-modal vibration to form DML (DML, Distributed Mode Loudspeaker).
  • Multi-modal vibration is also called bending vibration, which pushes the air to produce sound and realize audio playback .
  • the DML formed by the sounding substrate will undergo modal resonance at different positions of the substrate.
  • modal resonance occurs, the amplitude of the resonance antinodes scattered at different positions are equal, resulting in the same amount of air pushed by different positions of the sounding substrate.
  • the sound level is the same, so it is impossible to distinguish the sounds from the left and right sides of the projection screen, making it impossible to distinguish the left and right channels of the projection screen, which affects the sound localization.
  • the present application provides a display device, a sounding substrate, and a projection screen, which can solve the problem that the left channel and the right channel of the projection screen cannot be distinguished in the related art, which affects the sound positioning.
  • the technical solution is as follows:
  • a display device comprising: a projection screen and a signal providing component, the signal providing component is used to provide audio current to the projection screen, and the audio current Projecting a corresponding image to the projection screen;
  • the projection screen includes: an optical film, an exciter group and a sounding substrate;
  • the sounding substrate includes a honeycomb layer having a plurality of honeycomb holes, the depth direction of the honeycomb holes is parallel to the thickness direction of the honeycomb layer, and the rigidity of the honeycomb holes in the first direction is greater than that of the honeycomb layer.
  • the rigidity of the honeycomb hole in the second direction; the optical diaphragm is arranged on one side of the sounding substrate, the exciter group is arranged on the other side of the sounding substrate, and the exciter group is used to vibrate It is transmitted to the sounding substrate through the vibration output end to excite the sounding substrate to vibrate.
  • a sounding substrate in some embodiments of the present application, includes: a honeycomb layer and skins arranged on both sides of the honeycomb layer;
  • the honeycomb layer has a plurality of honeycomb cells, the depth direction of the honeycomb cells is parallel to the thickness direction of the honeycomb layer, and the rigidity of the honeycomb cells in the first direction is greater than the rigidity of the honeycomb cells in the second direction ;
  • the material of the skin is unidirectional fibers, and the extending direction of the unidirectional fibers is the first direction; or, the material of the skin is interwoven fibers formed by interlacing unidirectional fibers with different extending directions, In the interwoven fibers, the number of unidirectional fibers whose extending direction is the first direction is greater than the number of unidirectional fibers whose extending direction is the second direction.
  • a projection screen includes: an optical film, an exciter group, and the sounding substrate according to the second aspect, the exciter group includes at least one exciter;
  • the optical diaphragm is arranged on one side of the sounding substrate, the exciter group is arranged on the other side of the sounding substrate, and the vibration output end of the exciter is in contact with the sounding substrate;
  • the exciter is used to transmit vibration to the sounding substrate through the vibration output end to excite the sounding substrate to vibrate.
  • the display device, the sounding substrate, and the projection screen provided by the embodiments of the present application. Since the projection screen of the display device includes the sounding substrate and the exciter group, in the honeycomb layer of the sounding substrate, the rigidity of the honeycomb holes in the first direction is greater than that of the honeycomb holes Rigidity in the second direction, so when the exciter excites the sounding substrate to vibrate, the attenuation degree in the first direction is less than the attenuation degree in the second direction when the vibration is transmitted in the sounding substrate, which can avoid sound
  • the vibration amplitudes at different positions of the substrate in the second direction are equal, so that the difference in sound intensity cannot be distinguished and the vibrations overlap each other, thereby avoiding the inability to distinguish the left and right channels of the projection screen, and avoiding the impact on sound positioning.
  • the sounding substrate can vibrate to emit sound under the excitation of the exciter, there is no need to install speakers for the projection screen, which reduces the volume of the projection screen and satisfies the sound and image synchronization audiovisual effect in the same direction.
  • FIG. 1 is a schematic diagram of the structure of a display device involved in this application
  • FIG. 2 is a schematic diagram of a front view structure of a sounding substrate provided by an embodiment of the present application
  • FIG. 3 is a schematic cross-sectional structure diagram of a honeycomb layer provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of the principle of a sounding substrate provided by an embodiment of the present application.
  • FIG. 5 is a schematic cross-sectional structure diagram of a sounding substrate provided by an embodiment of the present application.
  • Figure 6 is a schematic front view of another sounding substrate provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a front view structure of still another sounding substrate provided by an embodiment of the present application.
  • FIG. 8 is a schematic front view structural diagram of yet another sounding substrate provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a projection screen provided by an embodiment of the present application.
  • FIG. 10 is a schematic cross-sectional view of the projection screen shown in FIG. 9 along the line S0-S0 according to an embodiment of the present application;
  • FIG. 11 is a schematic structural diagram of another projection screen provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of still another projection screen provided by an embodiment of the present application.
  • FIG. 13 is a schematic cross-sectional structure diagram of another projection screen shown in FIG. 9 along the line S0-S0 according to an embodiment of the present application;
  • Fig. 14 is a schematic structural diagram of a position stabilizer provided by an embodiment of the present application.
  • 15 is a schematic structural diagram of another position stabilizer provided by an embodiment of the present application.
  • 16 is a schematic diagram of a rear view structure of a projection screen provided by an embodiment of the present application.
  • FIG. 17 is a schematic cross-sectional structure diagram of the projection screen shown in FIG. 16 along line S1-S1 according to an embodiment of the present application;
  • FIG. 18 is a schematic cross-sectional structure diagram of the projection screen shown in FIG. 16 along the line S2-S2 provided by an embodiment of the present application;
  • FIG. 19 is a schematic cross-sectional view of the projection screen shown in FIG. 16 along the line S3-S3 according to an embodiment of the present application;
  • FIG. 20 is a schematic cross-sectional view of the projection screen shown in FIG. 16 along line S4-S4 according to an embodiment of the present application.
  • the projection screen sound technology similar to the flat panel sound is also called the excited voice screen (EVS, Excited voicingng Screen) technology.
  • EVS Excited voicingng Screen
  • the screen sound of this EVS technology has micron-level amplitude, low distortion and good transient response characteristics, so that the audio played through this technology has high definition, good power and spatial depth.
  • the projection screen using flat panel sound technology can be regarded as a large-area stereo DML flat panel speaker.
  • FIG. 1 shows a schematic structural diagram of a display device involved in this application.
  • the display device includes: a projection screen 01 and a signal providing component 02.
  • the signal providing component 02 can be used to provide audio current to the projection screen 01 and project an image corresponding to the audio current to the projection screen 01.
  • the signal providing component 02 may be a laser TV box.
  • the projection screen 01 usually includes a sounding substrate and an exciter arranged on the sounding substrate.
  • the exciter can receive the audio current from the signal providing component 02, generate mechanical vibration according to the audio current, excite the sounding substrate to form a DML, and push the air to produce sound (the The sound waveform is a bending wave), so that the projection screen 01 can realize audio playback.
  • DML will have modal resonance at different positions of the sounding substrate.
  • modal resonance occurs, the amplitudes of the resonance antinodes scattered at different positions are equal, resulting in the same amount of air pushed by different positions of the sounding substrate and the same sound level Therefore, it is impossible to distinguish the sound emitted from the left and right sides of the projection screen, making it impossible to distinguish the left and right channels of the projection screen, which affects the sound localization.
  • the embodiment of the present application provides a display device.
  • the sounding substrate of the display device includes a honeycomb layer with a plurality of honeycomb holes.
  • the honeycomb holes have different rigidities in different directions.
  • the honeycomb holes are smooth in different directions.
  • the flexibility (that is, flexibility) is also different. Therefore, after the sounding substrate vibrates, the attenuation degree in different directions is different during the vibration transmission process in the sounding substrate, so that the vibration amplitude in different directions is different (that is, the The sounding substrate has anisotropic mechanical response characteristics), so that the sound generated by the sounding substrate in different directions has different magnitudes.
  • the sounding range of the sounding substrate can be controlled, so that the sound emitted from the left side and the right side of the projection screen can be distinguished, and the left and right channels of the projection screen can be distinguished, thereby avoiding the influence on sound localization.
  • FIG. 2 shows a schematic front view structure of a sounding substrate 1 provided by an embodiment of the present application.
  • the sounding substrate 1 includes a honeycomb layer 11 having a plurality of honeycombs. ⁇ 111.
  • FIG. 3 shows a schematic cross-sectional structure diagram of a honeycomb layer 11 provided by an embodiment of the present application. Referring to FIGS. 2 and 3, the depth direction z of the honeycomb holes 111 and the thickness direction of the honeycomb layer 11 (both FIGS. 2 and 3 are (Not shown) parallel, the rigidity (also called strength) of the honeycomb holes 111 in the first direction y is greater than the rigidity of the honeycomb holes 111 in the second direction x.
  • the compliance of the honeycomb holes 111 in the first direction y (That is, flexibility) is smaller than the compliance of the honeycomb hole 111 in the second direction x.
  • the first direction y and the second direction x are both perpendicular to the depth direction of the honeycomb hole 111, and the first direction y and the second direction x are different.
  • the first direction y and the second direction x are perpendicular to each other.
  • the substrate is an orthotropic mechanical structure with orthotropic conductivity.
  • the sounding substrate 1 has at least two vibration regions (two are shown in FIG. 2). Each vibration zone may have an excitation point (the point where the exciter contacts the sounding substrate is the excitation point).
  • the modal resonance (the vibration is bending wave vibration) generated by the sounding substrate is transmitted to the surroundings by the excitation point.
  • the first direction y may be perpendicular to the long side of the rectangle, and the second direction x may be parallel to the long side of the rectangle.
  • the sounding substrate 1 may have two vibration areas, a first vibration area a1 and a second vibration area a2 arranged along the second direction x.
  • the two vibration areas may be areas close to both ends of the sounding substrate, and the first vibration area
  • the area a1 has a first excitation point A1
  • the second vibration area a2 has a second excitation point A2.
  • FIG. 4 shows the present invention.
  • the dashed line y1 indicates that the vibration is transmitted in the first direction y without attenuation, that is, the excitation response of the honeycomb layer (referring to the vibration intensity transmitted from the excitation point A to the surrounding) is 100%.
  • the line where the dashed line x1 is located indicates that the vibration is conducted in the second direction x without attenuation, that is, the excitation response of the honeycomb layer is 100%.
  • the solid line y2 represents the actual excitation response of the vibration in the first direction y.
  • the distance between any point on the solid line y2 and the corresponding point on the dotted line y1 is the attenuation degree of the vibration at any point (also That is, the degree of reduction in the amplitude of bending wave vibration).
  • the solid line x2 represents the actual excitation response of the vibration in the second direction x.
  • the distance between any point on the solid line x2 and the corresponding point on the dashed line x1 (for example, ⁇ x) is the vibration at any point The degree of attenuation.
  • the attenuation degree of the vibration conducted from the excitation point A to the surroundings in the first direction y is much smaller than the attenuation degree of the vibration in the second direction x, and it can almost be considered that the vibration is in the first direction y It conducts to the entire screen width without attenuation.
  • the attenuation degree of the vibration increases in the x3 direction with the excitation point A as the origin, and at the same time, the attenuation degree also increases in the x4 direction, then the energy transmission of the vibration will be obvious in the second direction x The energy gradient. Therefore, it is easy to control the vibration range of the honeycomb layer, thereby positioning the sound generated based on the vibration.
  • the first vibration area a1 and the first vibration area a1 have the same vibration amplitude, so that the vibration intensities of the first vibration area a1 and the second vibration area a2 are different, so that the intensity of the sound generated by the first vibration area a1 and the sound generated by the second vibration area a2
  • the intensity is different, and because the vibration intensity of the vibration in the second vibration area a2 is large, the sound generated based on the vibration is mainly concentrated in the second vibration area a2, that is, when the second excitation point A2 vibrates, the sound The sense of hearing can almost all come from the second vibration zone a2.
  • the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction, so when the sounding substrate vibrates In the process of vibration transmission in the sounding substrate, the attenuation degree in the first direction is less than the attenuation degree in the second direction. While obtaining the maximum vibration propagation range in the first direction, avoid the sounding substrate in the second direction. The vibration amplitudes at different positions are equal, which makes it impossible to distinguish the difference in sound intensity and the vibrations overlap each other, thereby reducing the impact on sound localization.
  • the shape of the opening of the honeycomb hole 111 is a convex hexagon.
  • the convex hexagon has two parallel sides of equal length, and has a first symmetry axis L1 and a second symmetry axis L2.
  • the first symmetry axis L1 and the two parallel sides are both parallel to the first direction y.
  • the two symmetry axis L2 is parallel to the second direction x, and the first symmetry axis L1 is perpendicular to the second symmetry axis L2.
  • the stretch ratio of the convex hexagon is in the range of 0.3 to 0.7.
  • the stretch ratio is the ratio of the first distance D to the second distance L
  • the first distance D is the distance between the two parallel sides of the convex hexagonal honeycomb cell
  • the first The range of the distance can be 3-10mm (millimeters).
  • the first distance may be 3mm, 6mm or 10mm
  • the second distance L is the length of the first diagonal of the convex hexagon and any one of the two parallel sides of the convex hexagon
  • the first diagonal of the convex hexagon is parallel to the first symmetry axis L1 of the convex hexagon
  • the second distance L may also be referred to as the vertex length of the honeycomb lattice.
  • the stretch ratio of the convex hexagon is 0.3, 0.32 or 0.7.
  • the stretch ratio of the opening shape of the honeycomb 111 ranges from 0.3 to 0.7, which can ensure that the rigidity of the honeycomb 111 in the first direction y is greater than that of the honeycomb 111 in the second direction x. ⁇ rigidity.
  • the material of the honeycomb layer 11 may be paper, aramid, metal or composite material.
  • FIG. 5 shows a schematic cross-sectional structure diagram of a sounding substrate 1 provided by an embodiment of the present application. Please refer to FIG. 5.
  • the sounding substrate 1 further includes: On the skin 12 on both sides of the honeycomb layer 11, the rigidity of the skin 12 in the first direction y is greater than the rigidity of the skin 12 in the second direction x, that is, the compliance of the skin 12 in the first direction y is less than The compliance of the skin 12 in the second direction x.
  • the first direction of the sounding substrate is increased.
  • the rigidity in the direction makes the attenuation degree of the vibration in the first direction smaller than the attenuation degree in the second direction when the sounding substrate vibrates, which enhances the anisotropic conduction performance of the sounding substrate.
  • the thickness of the skin 12 may range from 0.1 mm to 0.5 mm.
  • the thickness of the skin 12 may be 0.1 mm, 0.25 mm or 0.5 mm.
  • the material of the skin 12 may be unidirectional fibers or interwoven fibers formed by interlacing unidirectional fibers with different extending directions.
  • the unidirectional fibers and interwoven fibers include, but are not limited to, glass fibers, carbon fibers, glass-carbon hybrid fibers, plastic fibers, aluminum skins, and the like.
  • the extending direction of the unidirectional fiber is the first direction y, so that the rigidity of the skin 12 in the first direction y is greater than that of the skin 12 in the second direction x ⁇ rigidity.
  • the material of the skin 12 is interwoven fibers, in the interwoven fibers, the number of unidirectional fibers whose extending direction is the first direction y is greater than the number of unidirectional fibers whose extending direction is the second direction x, so as to facilitate the skin 12
  • the rigidity in the first direction y is greater than the rigidity of the skin 12 in the second direction x.
  • FIG. 6 shows a schematic front view structure diagram of another sounding substrate 1 provided by an embodiment of the present application.
  • the sounding substrate 1 may have multiple vibrations. Zone (only two are shown in Figure 6) and an isolation zone b located between every two adjacent vibration zones.
  • the isolation zone b can block the vibration transmission between the vibration zones and further avoid the mutual vibration of the vibration zones. Conduction, easy to control the sounding range of the sounding substrate.
  • the isolation region may have multiple possible implementation manners.
  • the embodiment of the present application uses the following three implementation manners as examples to describe the isolation region.
  • the sound-producing substrate in the isolation region has a low stiffness anisotropic mechanical structure compared to the vibration region, and the stretch ratio of the honeycomb cells in the isolation region is smaller than that of the honeycomb cells in the vibration region , So that the rigidity of the isolation area in the second direction is less than the rigidity of the vibration area in the second direction, and the compliance of the isolation area in the second direction is greater than the compliance of the vibration area in the second direction. There is greater compliance in the second direction.
  • the stretch ratio of the honeycomb cells in the vibration zone may range from 0.3 to 0.7, and the stretch ratio of the honeycomb cells in the isolation zone b is smaller than that in the vibration zone.
  • the stretch ratio of the honeycomb may be 0.4, and the stretch ratio of the honeycomb cells in the isolation zone b may be 0.3.
  • the stretch ratio of the honeycomb cells in the vibration zone may be 0.58, and the stretch ratio of the honeycomb cells in the isolation zone b may be 0.5.
  • the first distance of the honeycomb holes in the isolation area b is smaller than the first distance of the honeycomb holes in the vibration area; if the vibration area and the isolation area b are ignored If the first distance of the honeycomb holes changes, the second distance of the honeycomb holes in the isolation area b is greater than the second distance of the honeycomb holes in the vibration area.
  • the attenuation degree in the second direction when vibration is conducted in the isolation region is greater than when the vibration region is conducted.
  • the degree of attenuation in the second direction, so that the vibration is more attenuated when passing through the isolation region, so the isolation region can increase the barrier effect of vibration transmission between the vibration regions.
  • a band-shaped partition in the sounding substrate, according to the sounding needs of the sounding substrate, a band-shaped partition can be formed by filling the honeycomb holes at a specific position of the sounding substrate with a certain width of sound-absorbing material to separate the sounding substrate The vocal area.
  • the specific position refers to the position on the sounding substrate that needs to block sound vibration transmission.
  • the honeycomb holes in the isolation area may be filled with sound-absorbing material, so that the isolation area can absorb the vibration conducted to the isolation area, thereby absorbing the sound generated by the vibration conducted to the isolation area by the sound-emitting substrate.
  • FIG. 7 shows a schematic front view structure of still another sound-producing substrate 1 provided by an embodiment of the present application.
  • the honeycomb holes in the isolation region b are filled with sound-absorbing materials ( Not marked in Figure 7) to form a belt-shaped partition, and the sound absorbing material may be a foam damping sound absorbing material.
  • the stretch ratio of the honeycomb cells 111 in the vibration zone and the stretch ratio of the honeycomb cells 111 in the isolation zone b may be equal.
  • the stretch ratio of the honeycomb holes 111 in the vibration zone and the isolation zone b may both range from 0.3 to 0.7.
  • the sound-absorbing material in the isolation region can absorb the vibration conducted to the isolation region, thereby absorbing the sound generated by the vibration conducted to the isolation region, it can block the conduction of sound between the vibration regions.
  • the honeycomb holes in the isolation region b may be filled with sound-absorbing materials.
  • the isolation region can more effectively block vibration transmission between the vibration regions.
  • the shape, number, and position of the isolation area in the sounding substrate can be set according to actual sounding requirements (for example, the channel crosstalk requirement of the projection screen to which the sounding substrate belongs).
  • the embodiments of the present application are based on the following two The shape, number, and location of the isolation area are described as an example of this possible implementation.
  • the surface of the sounding substrate 1 and the isolation region b are both rectangular, and the sounding substrate 1 may include an isolation region b, which is sequentially arranged along the second direction x
  • the first vibration area a1 and the second vibration area a2 are arranged in two vibration areas a, the first vibration area a1 has a first excitation point A1, and the second vibration area a2 has a second excitation point A2.
  • the two symmetry axes of the surface of the sounding substrate 1 are the same as the two symmetry axes of the isolation region b, and the long side of the isolation region b is equal to the short side of the sounding substrate 1, and the short side of the isolation region b is the same as the sounding substrate
  • the long sides of the board of 1 are collinear.
  • the isolation region b is a long and narrow region parallel to the first direction and running through the entire sounding substrate.
  • the vibration generated by the first excitation point A1 is transmitted to the isolation area b, the vibration is attenuated in the second direction x to a greater degree during the conduction process of the isolation area b, so that the vibration is more severe when passing through the isolation area.
  • the more attenuation prevents the vibration from being transmitted to the second vibration area a2, so it is more effective to prevent the second vibration area a2 and the first vibration area a1 from having the same vibration amplitude, so that the first vibration area a1 and the second vibration area a1 have the same vibration amplitude.
  • the vibration intensity of the area a2 is different, so that the sound intensity generated in the first vibration area a1 and the second vibration area a2 are different, and the vibration intensity of the first vibration area a1 is large.
  • the sound generated based on the vibration is mainly concentrated in the first vibration area a1, that is, when the first excitation point A1 generates vibration, the sound and hearing can almost all come from the first vibration area a1.
  • the second excitation point A2 vibrates, the sound perception can almost be regarded as coming from the second vibration area a2.
  • the range of vibration generated by different excitation points of the sounding substrate 1 is effectively controlled, and the influence on sound localization is more effectively reduced.
  • FIG. 8 shows a schematic front view structure diagram of yet another sounding substrate 1 provided by an embodiment of the present application.
  • the board surface of the sounding substrate 1 is rectangular.
  • the sounding substrate 1 may include a first isolation area b1 and a second isolation area b2, a total of two isolation areas, and a first vibration area a1 and a third vibration area sequentially arranged along the second direction x.
  • Area a3 and second vibration area a2 have three vibration areas.
  • the first vibration area a1 has a first excitation point A1
  • the second vibration area a2 has a second excitation point A2
  • the third vibration area a3 has a third excitation point A3.
  • the figure formed by the connection of the two isolation regions is in the shape of a V.
  • the straight line where the opening of the V is located is collinear with one long side of the panel of the sounding substrate 1, and the vertex of the V is located on the other long side of the panel of the sounding substrate 1.
  • the isolation area is symmetrical about the first symmetry axis L3 of the surface of the sounding substrate 1, and the first symmetry axis L3 of the surface of the sounding substrate 1 is parallel to the short side of the surface of the sounding substrate 1.
  • the first symmetry axis L3 of the board surface of the sounding substrate 1 is parallel to the first symmetry axis L1 of the convex hexagon.
  • the first vibration area and the second vibration area are the same.
  • the sound and hearing can almost all come from the first vibration area a1.
  • the second excitation point A2 shown in FIG. 8 vibrates, the sound perception can almost be regarded as coming from the second vibration area a2.
  • the vibration when the vibration is transmitted to the second isolation region b2 in the second direction x, the vibration is attenuated in the second direction x to a greater degree during the conduction process of the second isolation region b2, so that the vibration is transmitted through It is more attenuated when passing through the second isolation region b2, blocking the transmission of the vibration to the second vibration region a2.
  • the vibration has the same vibration amplitude in the first vibration area a1, the second vibration area a2 and the third vibration area a3, so that the first vibration area a1, the second vibration area a2 and the third vibration area
  • the vibration intensity of a3 is different, so that the sound intensity generated in the first vibration area a1, the second vibration area a2, and the third vibration area a3 are all different, and because the vibration intensity of the vibration in the third vibration area a3 is large, therefore,
  • the sound generated based on the vibration is mainly concentrated in the third vibration area a3, and the sound perception can almost be regarded as coming from the third vibration area a3.
  • the range of vibration generated by different excitation points of the sounding substrate 1 is effectively controlled, and the influence on sound localization is more effectively reduced.
  • the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction, so when the sounding substrate vibrates In the process of vibration transmission in the sounding substrate, the attenuation degree in the first direction is less than the attenuation degree in the second direction. While obtaining the maximum vibration propagation range in the first direction, avoid the sounding substrate in the second direction. The vibration amplitudes at different positions are equal, which makes it impossible to distinguish the difference in sound intensity and the vibrations overlap each other, thereby reducing the impact on sound localization.
  • Figure 9 shows a schematic structural diagram of a projection screen provided by an embodiment of the present application
  • Figure 10 is a projection screen shown in Figure 9 provided by an embodiment of the present application along the line S0-S0 Schematic diagram of the cross-sectional structure.
  • the projection screen includes: a sounding substrate 1, an optical film 2 and an exciter group 3 (only two are shown in Figure 9).
  • the sounding substrate 1 may be provided by the above-mentioned embodiment
  • Each exciter group 3 includes at least one exciter 31.
  • the optical diaphragm 2 is arranged on one side of the sounding substrate 1, the exciter group 3 is arranged on the other side of the sounding substrate 1, and the vibration output end (also called actuation output end) of the exciter 31 is in contact with the sounding substrate 1.
  • the exciter 31 is used to transmit vibration to the sounding substrate 1 through the vibration output terminal, so as to excite the sounding substrate 1 to vibrate, thereby emitting sound (for example, stereo sound).
  • the exciter group 3 can be arranged in the corresponding area of the vibration area of the sounding substrate 1.
  • the rigidity of the sounding substrate in the first direction y is greater than the rigidity of the honeycomb cells 111 in the second direction x, and the compliance in the first direction y is smaller than the rigidity of the honeycomb cells 111 in the second direction x.
  • the first direction may be perpendicular to the connection between the left channel and the right channel of the projection screen, and the second direction may be parallel to the connection between the left channel and the right channel of the projection screen.
  • the projection screen provided by the embodiment of the present application includes a sounding substrate and an exciter group.
  • the rigidity of the honeycomb holes in the first direction is greater than that of the honeycomb holes in the second direction. Therefore, when the exciter excites the sounding substrate to vibrate, the attenuation in the first direction is less than the attenuation in the second direction during the vibration transmission in the sounding substrate, which can prevent the sounding substrate from being in the second direction.
  • the vibration amplitudes at different points in the direction are equal, so that the difference in sound intensity cannot be distinguished and the vibrations overlap each other, thereby avoiding the inability to distinguish the left channel and the right channel of the projection screen, and avoiding the influence on the sound positioning.
  • the sounding substrate can generate modal resonance to emit sound under the excitation of the exciter, there is no need to install a speaker for the projection screen, which reduces the volume of the projection screen, and satisfies the sound and image synchronization audiovisual effect in the same direction.
  • the optical film 2 may be a display film or a film with touch function.
  • a display panel can be used to replace the optical film 2, as long as the optical film 2 can perform a display function or a touch function.
  • the display film 2 may be a display film having an optical microstructure such as Fresnel, a bar grid, or a microlens array.
  • the optical film layer 2 may be bonded to the sound-producing substrate 1.
  • the projection screen may further include an adhesive layer 4 disposed on the optical film layer 2. Between and the sounding substrate 1, the adhesive layer 4 is used for bonding the optical film layer 2 and the sounding substrate 1.
  • each exciter group may include p exciters, and p ⁇ 1. Illustratively 1 ⁇ p ⁇ 4.
  • the vibration frequency ranges of the p exciters can be different. When the p exciters vibrate at the same time, the vibrations of different frequency ranges emitted by the p exciters can be superimposed on each other.
  • the exciter group composed of the p exciters has a higher Wide vibration frequency range to broaden frequency response.
  • the exciter can be an electromagnetic exciter, a piezoelectric exciter or a magnetostrictive exciter.
  • the electromagnetic exciter can include a drive coil, which can be the vibration output end of the electromagnetic exciter.
  • Electrical actuators are also called piezoelectric actuators, and magnetostrictive actuators are also known as magnetostrictive actuators, which can be made of giant magnetostrictive materials (GMM, Giant Magnetostrictive Material).
  • the piezoelectric actuator and the magnetostrictive actuator both include a driving end, and the driving end may be a vibration output end.
  • the drive coil tube of the exciter can directly contact the sounding substrate;
  • the drive end of the exciter can be Direct contact with the sounding substrate.
  • the brake output end of the exciter is usually connected to the sounding substrate through a transmission component.
  • the use of the transmission component will increase the additional mass of the projection screen, and the additional quality of the projection screen can easily affect the vibration and sound effect of the projection screen.
  • the vibration output end of the exciter is in direct contact with the sounding substrate, the use of transmission parts can be avoided, the additional quality of the projection screen is reduced, and the additional quality of the projection screen is reduced, thereby improving the projection screen Vibration sound effect.
  • the surface of the sounding substrate 1 is rectangular, and the projection screen includes at least two exciter groups, and the at least two exciter groups 3 are related to the sounding substrate 1
  • the first axial section e is symmetrical, and the first axial section e is parallel to the first side d of the sounding substrate 1, and the first side d is the smaller side of the side surfaces of the sounding substrate 1.
  • Each exciter group 3 includes at least two exciters 31, and the angle between the connecting line of the at least two exciters 31 and the first axis section e is less than or equal to 90 degrees.
  • each exciter group 3 includes an exciter 31a and an exciter 31b.
  • the angle between the line L4 of the exciter 31a and the exciter 31b and the first axis section e (not shown in FIG. 11) is equal to 0 degrees.
  • each exciter group 3 includes an exciter 31a and an exciter 31b.
  • the angle between the line L4 of the exciter 31a and the exciter 31b and the first axis section e is less than 90 degrees.
  • each exciter group 3 includes three exciters, and the three exciters may be an exciter 31a, an exciter 31b, and an exciter 31c, respectively.
  • the line L5 between the actuator 31a and the actuator 31b is perpendicular to the first axis section e, and the angle between the line L4 between the actuator 31c and the actuator 31b and the first axis section e (not shown in FIG. 9) is less than 90 degrees.
  • the exciter 31a and the exciter 31b may be high-frequency exciters, and the exciter 31c may be a low-frequency exciter.
  • the high-frequency exciter is arranged at an upper position on the projection screen and is close to the two ends of the projection screen, when the exciter group excites the sound generated by the sounding substrate, the sound field of the sound is wider, Positioning is better.
  • FIG. 13 is a schematic cross-sectional structure diagram of another projection screen shown in FIG. 9 along the line S0-S0 provided by an embodiment of the present application.
  • the projection screen further includes: a position stabilizer 5.
  • FIG. 14 shows a schematic structural diagram of a position stabilizer 5 provided by an embodiment of the present application.
  • the position stabilizer 5 includes a stabilizer main body 51, a plurality of legs 52 and a plurality of damping blocks 53.
  • a plurality of damping blocks 53 are arranged on one end of the plurality of legs 52 in one-to-one correspondence, the other end of the plurality of legs 52 is fixedly connected to the stabilizer body 51, and the plurality of legs 52 are distributed in the first circle ( Figure 13 and Figure 14 are both (Not shown), the center of the first circle is located on the axis of the stabilizer body 51 (not shown in FIGS. 13 and 14), and the first circle may be the center of the center on the axis of the stabilizer body 51 Any round.
  • the stabilizer body 51 has a first fixed position (not marked in FIG. 13), and the axis of the first fixed position may be collinear with the axis of the stabilizer body 51. As shown in FIG. 13, the vibration output end of the exciter 31 passes through The first fixing position of the stabilizer main body 51 abuts against the sounding substrate 1, and the damping block 53 is fixedly connected to the sounding substrate 1.
  • the stabilizer body 51 is cylindrical, the extension shape of the legs may be arcs, and the legs may be sheet-shaped elastic legs with a low elastic coefficient.
  • the leg 52 may extend along the circumferential direction of the stabilizer body 51 (that is, it extends away from the center of the stabilizer body 51), or, as shown in FIG. 15, the leg 52 may extend away from The direction of the axis of the stabilizer main body 51 extends (that is, the legs can extend radially). In this way, the position stabilizer 5 can be regarded as a spider structure.
  • the damping block 53 is fixedly connected to the sounding substrate 1. Therefore, The position stabilizer 5 can make the exciter 31 and the sounding substrate 1 in a relatively stable state, and ensure that the exciter 31 does not produce axial rotation.
  • the structure of the position stabilizer 5 enables the position stabilizer to have the function of a mechanical low-pass filter (similar to a shock absorber), so that vibration is transmitted to the feet 52 of the position stabilizer 5 Being filtered will not affect the vibration of the exciter 31 itself.
  • the exciter 31 is an electromagnetic exciter
  • the electromagnetic exciter has a drive coil tube and a magnetic pole device.
  • the magnetic pole device can generate a magnetic field.
  • the drive coil tube can generate relatively large electric power in the center of the magnetic field to drive the coil tube to actuate. .
  • the position stabilizer 5 can prevent the drive coil tube of the electromagnetic exciter from deviating from the center of the magnetic field due to the vibration of the sounding substrate, thereby ensuring that the electromagnetic exciter is in the best working state, and the position stabilizer 5 can ensure the electromagnetic excitation
  • the device does not produce axial twist, thereby greatly reducing the sound distortion of the sounding substrate.
  • FIG. 16 shows a schematic diagram of a rear view structure of a projection screen provided by an embodiment of the present application.
  • the projection screen further includes a fixing assembly 6, and the fixing assembly 6 includes a screen frame 61 and a fixing structure 62.
  • the screen frame 61 is arranged around the sounding substrate 1, and the fixing structure is used to fix the exciter group 3 and the sounding substrate 1.
  • the fixing structure 62 includes a first fixing member 62a, as shown in FIG. 17, which shows a projection shown in FIG. 16 provided by an embodiment of the present application.
  • the fixing plate 621a is arranged on the other side of the sounding substrate 1 (that is, the side away from the optical film 2), and is fixed The two ends of the plate 621a are clamped with the screen frame 61, the first exciter is arranged between the sounding substrate 1 and the fixed plate 621a, the buffer pad 621a is arranged between the first exciter and the fixed plate 621a, and the first exciter is respectively connected with The sounding substrate 1 and the cushion pad 621a are in contact with each other.
  • the first exciter refers to the exciter 31 fixed by the first fixing member 62a.
  • the fixing structure 62 further includes a second fixing member 62b, as shown in FIG. 18, which shows an embodiment of the present application as shown in FIG. A schematic diagram of the partial cross-sectional structure of the projection screen along the line S2-S2. 16 and 18, the second fixing member 62b includes: a back cover 621b, a sound insulation member 622b, and a gasket 623b.
  • the sound insulation member 622b is ring-shaped, and the sound insulation member 622b is fixedly connected to the rear cover 621b and the sounding substrate 1 respectively.
  • the sound insulation member 622b may be a sound insulation buffer member, such as a sound damping isolation ring, and the material of the sound insulation buffer member may be an ethylene vinyl acetate (EVA) foam material.
  • EVA ethylene vinyl acetate
  • the second exciter refers to the exciter 31 fixed by the second fixing member 62b. Since the back cover, sound insulation member and gasket constitute a closed space surrounding the exciter, the second fixing member 62b can not only fix the second exciter on the sounding substrate, but also isolate the second exciter from being actuated. Sound, reduce noise.
  • each first fixing member 62a can fix one first exciter, or can fix multiple first exciters at the same time
  • each second fixing member 62b can fix a second exciter.
  • the exciter can also fix multiple second exciters at the same time.
  • FIG. 16 does not limit the number of exciters fixed by the first fixing member 62a and the second fixing member 62b.
  • the fixing assembly 6 of the projection screen includes the first fixing part 62a and the second fixing part 62b as an example. In an actual projection screen, the fixing assembly 6 may only include the first fixing part. 62a or the second fixing member 62b, which is not limited in the embodiment of the present application.
  • FIG. 19 shows a schematic partial cross-sectional view of the projection screen shown in FIG. 16 along the line S3-S3 provided by an embodiment of the present application.
  • the fixing assembly 6 also includes: a suspension 63 and a shock-absorbing pad (not shown in FIGS. 16 and 19), the suspension 63 is connected to the screen frame 61, and the shock-absorbing pad is arranged between the suspension 63 and the screen frame 61 The contact position is set and is located between the hanging member 63 and the screen frame 61, and the hanging member 63 is used for hanging the projection screen.
  • the suspension member 63 can hang the projection screen on a supporting wall (such as a wall) by screws 7.
  • a foam double-sided adhesive strip 8 is provided between the screen frame 61 and the sounding substrate 1, and between the screen frame 61 and the optical film 2.
  • the double-sided foam tape 8 can be used to bond the screen frame 61 and the sounding substrate 1, as well as the screen frame 61 and the optical film 2, and can reduce the impact of the vibration of the sounding substrate 1 on the screen frame 61, extending the use of the projection screen life.
  • FIG. 20 shows a schematic partial cross-sectional view of the projection screen shown in FIG. 16 along the line S4-S4 according to an embodiment of the present application.
  • the projection screen also includes: an isolation rod 9 and a damping structure 10, both ends of the isolation rod 9 are fixedly connected to the screen frame 61, and the orthographic projection of the isolation rod 9 on the sounding substrate 1 is located in the isolation area of the sounding substrate 1.
  • the damping structure 10 is located between the isolation rod 9 and the sounding substrate 1, and is in contact with the isolation rod 9 and the sounding substrate 1.
  • the material of the damping structure 10 is a material with damping characteristics, so that the damping structure can attenuate the vibration generated by the sounding substrate 1 to control the transmission range of the vibration from the outside of the sounding substrate.
  • the projection screen provided by the embodiment of the present application includes a sounding substrate and an exciter group.
  • the rigidity of the honeycomb holes in the first direction is greater than that of the honeycomb holes in the second direction. Therefore, when the exciter excites the sounding substrate to vibrate, the attenuation in the first direction is less than the attenuation in the second direction during the vibration transmission in the sounding substrate, which can prevent the sounding substrate from being in the second direction.
  • the vibration amplitudes at different points in the direction are equal, so that the difference in sound intensity cannot be distinguished and the vibrations overlap each other, thereby avoiding the inability to distinguish the left channel and the right channel of the projection screen, and avoiding the impact on sound positioning. Since the sound-generating substrate can vibrate to emit sound under the excitation of the exciter, there is no need to install speakers for the projection screen, which reduces the volume of the projection screen and meets the audio-visual synchronization effect of sound and image in the same direction.
  • an embodiment of the present application also provides a display device.
  • the structure of the display device may be as shown in FIG. 1.
  • the display device includes: a projection screen and a signal providing component.
  • the projection screen may be provided for the foregoing embodiment Projection screen.
  • the signal providing component can be used to provide audio current for the projection screen and project an image corresponding to the audio current to the projection screen.
  • the projection screen can be used to perform image display and audio playback according to the audio current provided by the signal providing component.
  • the signal providing component may be a laser TV box.
  • the display device can be a laser TV or a projector.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

L'invention concerne un appareil d'affichage, un substrat générateur de son (1) et un écran de projection (01). L'appareil d'affichage comprend l'écran de projection (01) et un ensemble générateur de signal (02) ; l'écran de projection (01) comprend un diaphragme optique (2), un ensemble excitateur (3) et le substrat générateur de son (1) ; le substrat générateur de son (1) comprend une couche cellulaire (11) ; la couche cellulaire (11) comprend de multiples trous cellulaires (111) ; la rigidité du trou cellulaire (111) dans une première direction (y) est supérieure à celle du trou cellulaire (111) dans une seconde direction (x) ; le diaphragme optique (2) est disposé sur un côté du substrat générateur de son (1) ; l'ensemble excitateur (3) est disposé sur l'autre côté du substrat générateur de son (1) ; l'ensemble excitateur (3) sert à transmettre des vibrations au substrat générateur de son (1) au moyen d'une extrémité de sortie de vibrations de façon à exciter le substrat générateur de son (1) pour le faire vibrer.
PCT/CN2019/123325 2019-06-17 2019-12-05 Appareil d'affichage, substrat générateur de son et écran de projection WO2020253142A1 (fr)

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CN201910523769.4A CN112099298B (zh) 2019-06-17 2019-06-17 显示装置、发声基板以及投影屏幕
CN201910523769.4 2019-06-17

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CN112099298B (zh) 2022-05-06
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CN114967313A (zh) 2022-08-30
CN112099298A (zh) 2020-12-18

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