Display module and display device

Abstract

The application provides a display module and a display device, and relates to the technical field of display. The display module comprises a shell, a display panel and a sound field driver. The display panel comprises an active area and a passive area. The active area and the shell enclose a first cavity, and the passive area and the shell enclose a second cavity. The first cavity and the second cavity are in communication and filled with gas. The sound field driver is located in the first cavity and connected with the active area. The sound field driver is configured to drive the active area to vibrate according to a received electrical signal. The junction of the active area and the passive area is fixedly connected with the shell. The display is clearer when displaying medium and high frequency sound information.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display module and a display device. Background Technology

[0002] To create an immersive experience for users when using televisions, tablets, and other display devices, some devices employ a method of sound generation through panel vibration. However, the mid-to-high frequency sounds emitted by these devices are not clear enough. Summary of the Invention

[0003] Embodiments of this application provide a display module and display device that emit clearer mid-to-high frequency sound.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0005] On one hand, a display module is provided, including a housing, a display panel, and a sound field driver. The display panel includes an active area and a passive area. The active area and the housing form a first cavity, and the passive area and the housing form a second cavity. The first cavity and the second cavity are connected and filled with gas. The sound field driver is located in the first cavity and connected to the active area. The sound field driver is configured to drive the active area to vibrate according to a received electrical signal. The display panel at the junction of the active area and the passive area is fixedly connected to the housing.

[0006] In some possible implementations, when the frequency of the electrical signal is greater than or equal to a preset threshold, the passive zone does not vibrate; when the frequency of the electrical signal is less than the preset threshold, the vibration of the active zone is transmitted to the passive zone through the gas to drive the passive zone to vibrate.

[0007] In some possible implementations, the passive region vibrates in the same direction as the active region.

[0008] In some possible implementations, the passive region is provided with an additional layer on the side facing the second cavity, the additional layer being configured to increase or decrease the weight of the passive region.

[0009] In some possible implementations, the display panel includes a substrate and a plurality of light-emitting devices disposed on the substrate, wherein the additional layer is at least partially embedded within the substrate.

[0010] In some possible implementations, the elastic modulus of the additional layer is less than that of the substrate.

[0011] In some possible implementations, the active region is projected onto the light-emitting surface in a rectangular shape, with an aspect ratio of r1, where 0.7 ≤ r1 ≤ 1.5.

[0012] In some possible implementations, a baffle wall is provided on the side of the junction away from the light-emitting surface, and the baffle wall extends a predetermined distance in a direction perpendicular to the display panel to partially divide the first cavity and the second cavity.

[0013] In some possible implementations, the retaining wall is fixedly connected to the housing.

[0014] In some possible implementations, the housing is provided with a groove, the display panel covers the opening of the groove to form a first cavity and a second cavity, and a support beam is also provided in the groove, the support beam connecting the two side walls of the groove.

[0015] In some possible implementations, the retaining wall is fixedly connected to the supporting beam.

[0016] In some possible implementations, the display panel includes a first region, which includes the active region and the passive region. The orthographic projection of the first region onto the light-emitting surface is a rectangle, and the aspect ratio of the rectangle is r2, where r2 ≤ 0.7 or r2 ≥ 1.5.

[0017] In some possible implementations, the active area, the passive area, the first cavity, the second cavity, and the sound field driver constitute a sound-emitting unit, and the display module includes multiple sound-emitting units.

[0018] In some possible implementations, the active region and the passive region have the same area.

[0019] On the other hand, a display device is also provided, including the aforementioned display module.

[0020] The display module and display device provided in this application embodiment include an active area and a passive area in the display panel. The active area and the housing form a first cavity, and the passive area and the housing form a second cavity. The first cavity and the second cavity are connected and filled with gas. The boundary between the active area and the passive area is fixedly connected to the housing. A sound field driver is located in the first cavity and connected to the active area. During operation, the sound field driver drives the active area to vibrate according to the received electrical signal, causing the active area to vibrate and produce sound. Since the boundary between the active area and the passive area is fixedly connected to the housing, the boundary is fixed and cannot vibrate. When the active area vibrates, the vibration is cut off at the boundary, preventing the vibration from being directly transmitted to the passive area through the boundary. Furthermore, since the vibration of the active area has a smaller disturbance to the gas in the first and second cavities when displaying mid-to-high frequency sound information, the passive area cannot vibrate under the drive of the gas in the first and second cavities. Therefore, when the generating unit displays mid-to-high frequency sound information, only the active area vibrates, while the passive area does not vibrate. This reduces the area of ​​the vibrating region in the display panel, which in turn reduces the sound field coverage, making the mid-to-high frequency sound clearer and more directional. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A top view of a display module;

[0023] Figure 2 This is a cross-sectional view of a loudspeaker;

[0024] Figure 3 A cross-sectional view of a display module provided in an embodiment of this application;

[0025] Figure 4 A top view of a display module provided in an embodiment of this application;

[0026] Figure 5 A top view of a display module provided in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the shell structure in an embodiment of this application;

[0028] Figure 7 for Figure 1 A sectional view of AA in the middle;

[0029] Figure 8This is a graph showing the relationship between the aspect ratio of the display panel and its normalized intrinsic frequency.

[0030] Figure 9 A top view of a display module provided in an embodiment of this application;

[0031] Figure 10a A top view of a display panel;

[0032] Figure 10b A top view of a display panel provided in an embodiment of this application;

[0033] Figure 10c for Figure 10a and Figure 10b Schematic diagram of the amplitude of the display panel;

[0034] Figure 11 This is the equivalent diagram of the sound-generating unit;

[0035] Figure 12a This is a schematic diagram of the vibration in the active and passive regions at low frequencies.

[0036] Figure 12b This is a schematic diagram of the vibration in the active and passive regions at the resonant frequency;

[0037] Figure 13 and Figure 14 This is a cross-sectional view of a display module provided in an embodiment of this application. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] In the embodiments of this application, the terms "first", "second", "third", "fourth" are used to distinguish identical or similar items with essentially the same function and effect, only for the purpose of clearly describing the technical solution of the embodiments of this application, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0040] In the embodiments of this application, "multiple" means two or more, and "at least one" means one or more, unless otherwise explicitly specified.

[0041] In the embodiments of this application, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] This application provides a display device, which may be a television, mobile phone, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), wearable device, virtual reality device or mobile computing device, or other device with a display panel and a transmitting unit. This application does not limit the scope of the device.

[0043] The display device includes a display panel and a sound generation unit. The display panel is used to display image information, and the sound generation unit is used to display sound information. For example, when the display device plays a video, the display panel is used to display image information (e.g., consecutive image frames) in the video, and the sound generation unit is used to display sound information (e.g., sound synchronized with consecutive image frames) in the video.

[0044] Specifically, the display device includes a housing and a display panel attached to the housing.

[0045] The outer casing may include a housing, which is connected to the display panel. The housing, the display panel, and components connected to the housing and / or the display panel (e.g., the driver board of the display panel) can together constitute a display module. During the assembly of the display device, the display module can be assembled as a whole. For example, the display device is a television set, and the outer casing of the display device includes a housing and a rear housing. The housing and the display panel, etc., constitute a display module, and the display module and the rear housing are assembled to form a television set. Of course, in actual applications, in addition to the display module and the rear housing, the display device may also include other components such as a control board, a power module, and a base, which will not be described in detail here.

[0046] The display panel is connected to the housing, forming a cavity together. A sound field driver is located within this cavity and is connected to the display panel. During operation, the sound field driver drives the display panel to vibrate based on received electrical signals, thus producing sound from the display device.

[0047] The area in the display panel used for vibration and sound generation is called the first area. The first area can be the entire area of ​​the display panel or a part of the display panel. The first area, the sound field generator connected to the first area, and the shell that forms a cavity with the first area work together to generate sound, and are therefore called a sound generating unit, and the cavity is called a sound generating cavity.

[0048] The display device may have one sound-emitting unit or multiple sound-emitting units to improve the display effect of sound information. When the display device has one sound-emitting unit, the display panel includes a first area; when the display device has multiple sound-emitting units, the display panel includes multiple first areas.

[0049] For example, the display device has two sound-emitting units, one of which is used to display left channel sound information and the other is used to display right channel sound information.

[0050] Figure 1 This is a top view of a display module. Figure 1 Each rectangular area represents a sound-producing unit. For example, as shown... Figure 1 As shown, the display device includes multiple sound-emitting units arranged in an array. For example, if the display device is a television set, considering the spatial localization characteristics of sound by the human ear, it can be divided into four sections horizontally and two sections vertically, resulting in eight sections. Each section has at least one sound-emitting unit. This improves the integration of sound and picture. In practical applications, to avoid interference between adjacent sound-emitting units, foam or double-sided tape can be used between them.

[0051] The principle by which the sound field driver drives the display panel to vibrate can be referenced from the principle of the loudspeaker in related technologies. Figure 2 This is a cross-sectional view of a loudspeaker. (Example) Figure 2 As shown, the loudspeaker includes a frame 1, a diaphragm 2, a buffer diaphragm 3, a coil 4, and a magnet 5. The periphery of the diaphragm 2 is connected to the frame 1, and the diaphragm 2 is connected to the coil 4. During operation, an electrical signal is passed through the coil 4 to generate a magnetic field. The generated magnetic field interacts with the fixed magnet 5, causing the coil 4 to move relative to the magnet 5, thereby causing the coil 4 to drive the diaphragm 2 to vibrate and produce sound.

[0052] For example, the sound field driver includes a coil and a magnet, with the coil connected to the display panel. During operation, an electrical signal is passed through the coil to generate a magnetic field. This magnetic field interacts with the magnet, causing the coil to move relative to the magnet, thereby causing the coil to vibrate the display panel and produce sound. Alternatively, the magnet can be connected directly to the display panel. This application does not limit the structure or vibration principle of the sound field driver, as long as it can drive the display panel to vibrate and produce sound.

[0053] One side of the sound field driver is connected to the display panel, while the opposite side can be suspended or fixedly connected to the housing. When the other side of the sound field driver is fixedly connected to the housing, a buffer structure (such as foam, rubber, or other cushioning pads) can be provided between the sound field driver and the housing.

[0054] To facilitate better vibration and sound generation, the display panel can possess good flexibility. For example, the display panel can be an Organic Light Emitting Display (OLED) panel. Of course, the display panel can also be an LCD, MiniLED, MicroLED panel, etc. The display panel may include a substrate and multiple light-emitting devices disposed on the substrate; the multiple light-emitting devices work together to display image information.

[0055] In practical applications, it was found that because the first area used for vibration and sound generation in a single generating unit is relatively large, the sound field coverage is large. When the generating unit displays mid-to-high frequency sound information in an indoor environment, the sound is reflected by walls, the ground, and other obstacles, resulting in poor directivity and unclear mid-to-high frequency sound.

[0056] To improve the clarity of mid-to-high frequency sounds, it is necessary to reduce the sound field coverage of mid-to-high frequency sounds, that is, to reduce the area of ​​the vibrating region in the first region. Based on this, in this embodiment, the first region includes an active region and a passive region. When displaying mid-to-high frequency sound information, the active region vibrates while the passive region does not vibrate. It should be noted that "passive region does not vibrate" means that the passive region does not vibrate at all, or the sound emitted by the vibration of the passive region is not easily perceived.

[0057] Specifically, the active area and the housing form a first cavity, and the passive area and the housing form a second cavity. The first and second cavities are connected and filled with gas. The gas can be air, an inert gas, or other gases. When the gas is an inert gas, it can prevent oxidation of the components in the first and second cavities, thus improving the lifespan of the display device. The boundary between the active and passive areas is fixedly connected to the housing. The sound field driver is located in the first cavity and connected to the active area.

[0058] Figure 3 This is a cross-sectional view of a display module provided in an embodiment of this application. Exemplarily, as shown... Figure 3 As shown, the periphery of the display panel is connected to the housing 20, so that the display panel and the housing 20 form a sound-emitting cavity. The display panel includes an active area 11 and a passive area 12. The area in the sound-emitting cavity corresponding to the active area 11 is the first cavity 20a, and the area in the sound-emitting cavity corresponding to the passive area 12 is the second cavity 20b. The boundary between the active area 11 and the passive area 12 is fixedly connected to the housing 20. The sound field generator 30 is connected to the side of the display panel away from the light-emitting surface, and the sound field generator 30 is suspended.

[0059] During operation, the sound field driver drives the active zone to vibrate based on the received electrical signal, causing the active zone to vibrate and produce sound. Because the boundary between the active and passive zones is fixedly connected to the housing, this boundary is fixed and cannot vibrate. When the active zone vibrates, the vibration is cut off at the boundary, preventing the vibration from being directly transmitted to the passive zone through the boundary.

[0060] Furthermore, since the vibration of the active area has minimal disturbance to the gas in the first and second cavities when displaying mid-to-high frequency sound information, the passive area cannot vibrate under the drive of the gas in the first and second cavities. Therefore, in the display device provided in this application embodiment, when the generating unit displays mid-to-high frequency sound information, only the active area vibrates, while the passive area does not vibrate, reducing the area of ​​the vibration region in the display panel, i.e., reducing the sound field coverage, thereby making the mid-to-high frequency sound clearer and more directional.

[0061] Furthermore, in scenarios such as cinemas, home theaters, and conference rooms, it is necessary for the sound emission point and the image display point to coincide to enhance the immersive experience for viewers. Due to the physiological characteristics of the human ear, people are more sensitive to the spatial perception of mid-to-high frequency sounds. In the embodiment of this application, when displaying mid-to-high frequency sound information, only the active area vibrates to produce sound, and the sound image position is basically at the center of the active area. In contrast, in related technical solutions, the active and passive areas emit sound across the entire surface, and the sound image position is at the center of the entire surface, resulting in a deviation in the sound image reproduction position. Therefore, the sound reproduction unit in this embodiment can achieve more accurate reproduction of the sound position.

[0062] The frequency of the electrical signal received by the sound field driver is the same as the frequency of the displayed sound information. When the frequency of the electrical signal is greater than or equal to a preset threshold, the displayed sound information is mid-to-high frequency sound information. For example, the preset threshold can be in the range of 160-250Hz. For example, the preset threshold is 160Hz, 170Hz, 180Hz, 190Hz, 200Hz, 210Hz, 220Hz, 230Hz, 240Hz, or 250Hz.

[0063] The sound field driver drives the active zone to vibrate. The vibration frequency and amplitude of the active zone depend on the vibration frequency and amplitude of the sound field driver. With a fixed power, the higher the vibration frequency of the sound field driver, the smaller its amplitude. Conversely, the smaller the amplitude of the sound field driver, the smaller the amplitude of the active zone. When the amplitude of the active zone is sufficiently small, the disturbance it causes to the gas in the first and second cavities is minimal, resulting in insufficient energy for the gas in the first and second cavities to drive the passive zone to vibrate.

[0064] Therefore, when the frequency of the electrical signal is greater than or equal to the preset threshold, the gas in the first and second cavities cannot drive the passive zone to vibrate, so that only the active zone vibrates to produce sound.

[0065] A baffle wall can be installed on the side of the junction facing away from the light-emitting surface. The baffle wall extends a predetermined distance perpendicular to the display panel to partially divide the first cavity and the second cavity. On the one hand, setting a baffle wall at the junction increases the weight at the junction, making it less prone to vibration, thereby isolating the active and passive zones and preventing vibrations from the active zone from being directly transmitted to the passive zone. On the other hand, the baffle wall partially divides the first and second cavities, making it less likely for disturbances in the gas in the first cavity to be transmitted to the gas in the second cavity, thus reducing the likelihood of vibrations in the passive zone and resulting in clearer mid-to-high frequency sound information displayed by the generating unit.

[0066] For example, a connecting area is provided between the active area and the passive area, serving as the boundary between the two areas. In this case, the connecting area is fixedly connected to the housing. For instance, a baffle wall is provided on the side of the connecting area facing away from the light-emitting surface, and the baffle wall is fixedly connected to the housing. Of course, the connecting area can also be fixedly connected to the housing in other ways. For example, the connecting area can be directly connected to the housing.

[0067] For example, such as Figure 3 As shown, the cross-section of retaining wall 40 is rectangular.

[0068] For example, the barrier can be made of foam such as EVA, and one side of the foam is attached to the display panel with double-sided adhesive.

[0069] Furthermore, the retaining wall can be fixedly connected to the shell, thereby achieving a fixed connection between the junction and the shell.

[0070] For example, the barrier can be made of foam such as EVA, with one side of the foam adhered to the display panel using double-sided adhesive, and the opposite side of the foam adhered to the housing using double-sided adhesive. This facilitates the assembly and maintenance of the display device.

[0071] In practical applications, there can be one or multiple retaining walls. Figure 4 This is a top view of a display module provided in an embodiment of this application. Exemplarily, as shown... Figure 4 As shown, the display module includes two parallel barrier walls 40. The two barrier walls 40 provide better isolation between the active zone 11 and the passive zone 12.

[0072] The shape of the retaining wall can be Figure 4 The straight line shown can also be a curve or a broken line; this application does not limit this. Figure 5 This is a top view of a display module provided in an embodiment of this application. Exemplarily, as shown... Figure 5 As shown, the retaining wall 40 can be a polygonal shape.

[0073] In addition, the active and passive zones can have the same area to improve the sound output of the speaker unit.

[0074] The housing may have a recess, with the display panel covering the opening of the recess to form a first cavity and a second cavity. A support beam is also provided within the recess, connecting the two side walls of the recess. This connection of the support beam to the two side walls of the recess increases the structural strength of the housing and makes it less prone to deformation.

[0075] Figure 6 This is a schematic diagram of the shell structure in an embodiment of this application. Figure 6 As shown, the orthographic projection of the housing 20 onto the light-emitting surface is rectangular. The housing includes four side walls 22 connected in sequence and a bottom wall connected to the four side walls 22. The four side walls 22 and the bottom wall together form a groove. It may include two support beams 21 arranged in a cross shape, with each support beam 21 connecting to two opposite side walls 22. For example, the housing also includes a top wall connected to the four side walls 22, which is positioned opposite the bottom wall. The top wall has four openings arranged in a rectangular array, forming a cross-shaped support beam 21.

[0076] The retaining wall can be fixedly connected to the supporting beam, making the connection between the boundary between the active and passive zones and the shell more convenient. Of course, there are several other ways to fix the boundary between the active and passive zones and the shell. For example, the boundary can be directly bonded to the shell. Another example is that the retaining wall can be directly... Figure 6 The bottom wall of the shell shown is fixedly connected.

[0077] In the above example, only one active area and one passive area are described as the first region. In practical applications, the first region may also include multiple passive areas. For example, the first region may include one active area and two passive areas, with a passive area on one side of the active area and another passive area on the opposite side of the active area. Of course, the number of passive areas may also be three, four, etc. The number of active areas may also be multiple. For example, the first region may include two active areas. This application embodiment does not limit the number of active and passive areas within the first region.

[0078] When a display panel includes multiple sound-emitting units, each sound-emitting unit may include an active area and a passive area, or some of the sound-emitting units may include an active area and a passive area.

[0079] Figure 7 for Figure 1 A cross-sectional view of AA. For example, as shown... Figure 1 and Figure 7 As shown, the sound-emitting unit includes a first sound-emitting unit 100a and a second sound-emitting unit 100b. Both the first sound-emitting unit 100a and the second sound-emitting unit 100b include an active area 11 and a passive area 12, and the passive area 12 of the first sound-emitting unit 100a and the active area 11 of the second sound-emitting unit 100b are arranged adjacent to each other.

[0080] The playback efficiency and playback quality deteriorate in the frequency range below the low-frequency cutoff frequency f of the sound generated by the vibration of the display panel. Therefore, it is necessary to lower the low-frequency cutoff frequency f as much as possible to broaden the playback frequency range. The low-frequency cutoff frequency f depends on the minimum value between the natural frequency fp of the display panel (first area) and the natural frequency fe of the sound field generator. Therefore, it is necessary to lower the natural frequency fp of the display panel (first area) and / or the natural frequency fe of the sound field generator.

[0081] The natural frequency fp of a rectangular display panel and the size of the display panel satisfy the following relationship:

[0082]

[0083] Where i and j represent vibration modes, a and b represent the width and length of the display panel, respectively, ρ represents the density of the display panel, D represents the bending stiffness of the display panel, and h represents the thickness of the display panel. Figure 3 (Dimensions in the top and bottom directions).

[0084] Figure 8 This is a graph showing the relationship between the aspect ratio of the display panel and its normalized intrinsic frequency. (Example:) Figure 8 As shown, when the area, material, and thickness of the display panel are constant, the inherent frequency fp of the display panel first decreases and then increases as the aspect ratio of the display panel increases. When the aspect ratio is between 0.7 and 1.5, fp is relatively small, while when the aspect ratio is less than 0.7 or greater than 1.5, fp is relatively large.

[0085] The orthographic projection of the first region onto the light-emitting surface can be a rectangle with an aspect ratio of r², where r² ≤ 0.7 or r² ≥ 1.5. In this case, the natural frequency of the first region is relatively high, resulting in a high low-frequency cutoff frequency. After dividing the first region into an active region and a passive region, the active region vibrates, therefore the low-frequency cutoff frequency depends on the natural frequency of the active region.

[0086] When only the active region vibrates and the passive region does not vibrate in the first region, the natural frequency fp is the natural frequency of the active region. The orthographic projection of the active region onto the light-emitting surface can be rectangular in shape, with an aspect ratio of r1. To reduce the natural frequency fp of the active region, it can be set to 0.7 ≤ r1 ≤ 1.5.

[0087] Of course, the shape of the active area is not limited to a rectangle; it can also be other shapes. Figure 9 This is a top view of a display module provided in an embodiment of this application. Exemplarily, as shown... Figure 9 As shown, both the active region 11 and the passive region 12 can be regular hexagons. In this case, the dimensions at lower natural frequencies can be obtained through simulation. Of course, the active region can also be other shapes, which will not be listed here.

[0088] When the frequency of the electrical signal is less than a preset threshold, the generating unit displays low-frequency sound information. To increase the intensity of the low-frequency sound information, the active and passive zones of the generating unit can vibrate simultaneously when displaying low-frequency sound information.

[0089] The passive region's orthographic projection onto the light-emitting surface can be rectangular, with an aspect ratio of r3. To reduce the active region's natural frequency fp, this ratio can be set to 0.7 ≤ r3 ≤ 1.5. Of course, the passive region's shape is not limited to a rectangle; it can also be a pentagon, hexagon, or other polygonal or irregular shape.

[0090] When displaying low-frequency sound information, the vibration frequency of the sound field driver is relatively low, and with a fixed power, the amplitude is relatively large. A larger amplitude in the sound field driver results in a larger amplitude in the active zone, leading to greater disturbance of the gas within the first cavity. This, in turn, causes the gas to drive the vibration of the passive zone. In other words, the vibration of the active zone is transmitted to the passive zone through the gas, thus driving the passive zone to vibrate.

[0091] To improve the display of low-frequency sound information, the passive zone can vibrate in the same direction as the active zone.

[0092] Figure 10a This is a top view of a display panel, where the entire area of ​​the display panel is a vibration zone. Figure 10b This is a top view of a display panel provided in an embodiment of this application. The display panel in the figure is... Figure 10a The display panels in the two areas are the same shape and size, but are divided into an active area 11 and a passive area 12. Figure 10c for Figure 10a and Figure 10b The diagram shows the amplitude of the display panel, where line L1 is... Figure 10a The amplitude curves of the display panel, lines L2 and L3 are respectively Figure 10b Amplitude curves of the active region 11 and the passive region 12. (Example) Figure 10c As shown, the amplitudes of the active and passive regions are the same, and both are related to... Figure 10a The amplitude of the display panel is the same.

[0093] According to Rayleigh integration, the radiated sound pressure is directly proportional to the volume of air displaced by the display panel's vibration, while the volume of displaced air is proportional to... Figure 10c The area enclosed by the curve and the horizontal axis is directly proportional. Figure 10c In the middle, the area B between line L1 and the horizontal axis is... Figure 10a The volume of air displaced when the display panel vibrates is directly proportional to the sum of the areas C between lines L2 and L3 and the horizontal axis. Figure 10b The volume of air displaced when the display panel vibrates is directly proportional to the volume of air displaced. As shown in the diagram, area C is larger than area B. Therefore, the sound pressure increases when the active and passive zones vibrate simultaneously.

[0094] like Figure 11 As shown, the active region is equivalent to the first oscillator 11a, the passive region is equivalent to the second oscillator 12a, and the gas in the first and second cavities is equivalent to the spring 20c. The active region, the passive region, and the gas in the first and second cavities constitute a spring-double oscillator system. Among them, the first oscillator 11a acts as the vibration source, applying an alternating force to the spring 20c.

[0095] like Figure 12a As shown, at low frequencies, the spring is almost rigid, and the second oscillator vibrates along with the first oscillator in the opposite direction. Figure 12b As shown, when the frequency equals the resonant frequency, the spring and the second oscillator resonate, causing the first oscillator and the second oscillator to vibrate in the same direction.

[0096] The resonant frequency of the spring oscillator system satisfies the following relationship:

[0097]

[0098] Where k is the spring constant, determined by the gas in the first and second cavities; m is the mass of the passive zone.

[0099] Therefore, the resonant frequency can be adjusted by changing the quality of the passive zone, making it the same as the frequency of the low-frequency sound information being displayed. This causes the active and passive zones to vibrate in the same direction when displaying low-frequency sound information, thus increasing the sound pressure level.

[0100] Based on this, an additional layer can be placed on the side of the passive region facing the second cavity, thereby increasing or decreasing the weight of the passive region. Increasing the weight of the passive region can lower the resonant frequency, while decreasing the weight of the passive region can increase the resonant frequency.

[0101] The additional layer can be attached to the side of the substrate away from the light-emitting device in the passive region, or it can be at least partially embedded in the substrate.

[0102] For example, such as Figure 13 As shown, when it is necessary to increase the weight of the passive region 12, an additional layer 50 can be attached to the side of the substrate in the passive region 12 away from the light-emitting device. Because an additional layer 50 is added to the passive region 12, the weight of the passive region 12 is increased. The additional layer 12 can be made of a high-density material to reduce the space occupied by the additional layer 12.

[0103] For example, Figure 14 As shown, to further reduce the space occupied by the additional layer 50, it can be partially or completely embedded in the substrate. For example, if the substrate is a glass substrate, blind holes can be etched on the glass substrate, and the additional layer 50 can be formed by filling the blind holes with material.

[0104] Of course, embedding the additional layer partially or entirely into the substrate can reduce the weight of the passive region. For example, the additional layer is made of a material with a lower density than the substrate. After the additional layer is partially or entirely embedded into the substrate, it is equivalent to the additional layer replacing part of the substrate, thereby reducing the overall weight of the passive region.

[0105] In practical applications, the area of ​​the additional layer can be less than or equal to 90% of the passive area.

[0106] The elastic modulus of the additional layer can be less than that of the substrate. The smaller the elastic modulus, the easier the material is to bend. When the elastic modulus of the additional layer is less than that of the substrate, the passive region is easier to bend and thus more likely to vibrate under the drive of gas.

[0107] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display module, characterized in that, It includes a housing, a display panel fixedly connected to the housing, and a sound field driver fixed to the display panel. The display panel includes an active area and a passive area. The active area and the housing form a first cavity, and the passive area and the housing form a second cavity. The first cavity and the second cavity are connected and filled with gas. The acoustic field driver is located in the first cavity and connected to the active region. The acoustic field driver is configured to drive the active region to vibrate according to the received electrical signal. The display panel at the boundary between the active area and the passive area is fixedly connected to the housing. When the frequency of the electrical signal is greater than or equal to a preset threshold, the passive zone does not vibrate; when the frequency of the electrical signal is less than the preset threshold, the vibration of the active zone is transmitted to the passive zone through the gas to drive the passive zone to vibrate.

2. The display module according to claim 1, characterized in that, The passive region vibrates in the same direction as the active region.

3. The display module according to claim 1, characterized in that, An additional layer is provided on the side of the passive region facing the second cavity, and the additional layer is configured to increase or decrease the weight of the passive region.

4. The display module according to claim 3, characterized in that, The display panel includes a substrate and a plurality of light-emitting devices disposed on the substrate, and the additional layer is at least partially embedded in the substrate.

5. The display module according to claim 4, characterized in that, The elastic modulus of the additional layer is less than that of the substrate.

6. The display module according to claim 1, characterized in that, The active region's orthographic projection onto the light-emitting surface is rectangular, with an aspect ratio of r1, where 0.7 ≤ r1 ≤ 1.

5.

7. The display module according to any one of claims 1-6, characterized in that, A baffle wall is provided on the side of the junction away from the light-emitting surface. The baffle wall extends a predetermined distance in a direction perpendicular to the display panel to partially divide the first cavity and the second cavity.

8. The display module according to claim 7, characterized in that, The retaining wall is fixedly connected to the shell.

9. The display module according to claim 8, characterized in that, The housing has a groove, and the display panel covers the opening of the groove to form a first cavity and a second cavity. The groove is also provided with a support beam, which connects the two side walls of the groove.

10. The display module according to claim 9, characterized in that, The retaining wall is fixedly connected to the supporting beam.

11. The display module according to claim 1, characterized in that, The display panel includes a first region, which includes the active region and the passive region. The orthographic projection of the first region onto the light-emitting surface is a rectangle, and the aspect ratio of the rectangle is r2, where r2≤0.7 or r2≥1.

5.

12. The display module according to claim 1, characterized in that, The active zone, the passive zone, the first cavity, the second cavity, and the sound field driver together form a sound-generating unit. The display module includes multiple sound-emitting units.

13. The display module according to claim 1, characterized in that, The active region and the passive region have the same area.

14. A display device, characterized in that, Includes the display module as described in any one of claims 1-13.

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