CN116453434A

CN116453434A - Display module and display device

Info

Publication number: CN116453434A
Application number: CN202310489796.0A
Authority: CN
Inventors: 江鑫宇; 张致远; 田凡
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-07-18

Abstract

The invention provides a display module and a display device, wherein the display module comprises a backlight module and a cover plate, the cover plate comprises a display area and a frame area positioned on at least one side of the display area, one side of the cover plate, which is away from the backlight module in the thickness direction of the display module, or the frame area is provided with a directional sounding component, and the directional sounding component is used for sounding according to a preset sounding angle; according to the invention, the directional sounding component is arranged on the display module, so that the audio-visual environment requirements of passengers in different seats in the vehicle can be met, and the riding experience of the passengers in the vehicle can be improved.

Description

Display module and display device

Technical Field

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

Background

It is desirable for passengers in a vehicle to have a good audiovisual environment within the vehicle. For example, when the main driver uses the navigation service, other passengers want to not be affected by the navigation broadcasting sound, namely, a comfortable driving experience is needed: quiet rest, reading environment, even independent immersive video entertainment. When other passengers who are not driving use the entertainment auxiliary screen to watch the video and even play games, the driving is hoped not to be disturbed, so that the high concentration can be kept, and the potential safety hazard caused by the distraction of the attention of the driver is avoided.

Therefore, how to meet the respective audio-visual environment requirements of passengers of different seats in a vehicle is a problem at present.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the invention and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

In view of this, the present invention provides a display module and a display device, which can meet the audio-visual environment requirements of passengers in different seats in a vehicle, and is beneficial to improving the riding experience of passengers in the vehicle.

According to one aspect of the invention, a display module is provided, which comprises a backlight module and a cover plate, wherein the cover plate comprises a display area and a frame area positioned on at least one side of the display area, one side of the cover plate, which is away from the backlight module in the thickness direction of the display module, or the frame area is provided with a directional sounding component, and the directional sounding component is used for sounding according to a preset sounding angle.

According to another aspect of the present invention, a display device is provided, including any one of the display modules described above.

Compared with the prior art, the invention has the beneficial effects that:

according to the display module and the display device provided by the invention, the directional sounding assembly is arranged on the display module, so that directional sounding can be performed according to the preset sounding angle, the respective audio-visual environment requirements of passengers in different seats in the vehicle are met, the situation that irrelevant people are interfered by sound can be avoided, and the riding experience of the passengers in the vehicle is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic view of a sound field diffusion direction in a vehicle in an application scenario in the prior art;

fig. 2 is a schematic structural diagram of a display module according to an embodiment of the invention;

FIG. 3 is a schematic diagram illustrating a structure of a cover plate in a display module according to an embodiment of the invention;

fig. 4 is a schematic diagram of a sound field diffusion direction in a vehicle under the same application scenario according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a display module according to another embodiment of the present invention;

FIG. 6 is a top view of a distributed structure of array elements in a piezoelectric thin film transducer according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a distributed structure of array elements in a piezoelectric thin film transducer according to an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating radiation directions of sound fields of a piezoelectric thin film transducer at different resonant frequencies according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating a MEMS transducer according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a partitioned sounding of each parametric array in the core layer of a MEMS transducer according to an embodiment of the present invention;

FIG. 11 is a schematic diagram illustrating the zonal sounding of each parametric array in the core layer of a MEMS transducer according to another embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It is noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art may readily devise numerous other arrangements that do not depart from the spirit of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements.

In order that the above objects, features and advantages of the invention will be readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship, and the layer thicknesses of certain portions are exaggerated in the drawing for easy understanding, and the layer thicknesses in the drawings do not represent the proportional relationship of the actual layer thicknesses. And embodiments of the invention and features of embodiments may be combined with each other without conflict. The drawings of the various embodiments in this application bear the same reference numerals.

Referring to fig. 1, in an in-vehicle application scenario of the prior art, referring to the sound field diffusion direction 11 shown in fig. 1 (assuming that a display screen is provided in front of each seat), a conventional in-vehicle audio-visual system is commonly shared, that is, the sound field diffuses all around. When answering a call and playing music, the passengers in the car can be influenced, and even the attention of a driver can be dispersed, so that potential safety hazards are brought.

In order to solve the problems, the invention discloses a display module. Referring to fig. 2, the display module includes a backlight module 21 and a cover plate 22 stacked. Referring to fig. 3, the cover 22 includes a display area 31 and a frame area 32 located at least on one side of the display area 31. The rim area 32 of the cover plate is provided with directional sound emitting components. Or, a directional sounding component is arranged on one side of the cover plate, which is away from the backlight module, along the thickness direction of the display module. The directional sounding component is used for sounding according to a preset sounding angle. Referring to the sound field dispersion direction 41 shown in fig. 4 (assuming that there is a display screen in front of each seat), directional sound production on a display device screen such as a car screen or a notebook screen can be realized, and irrelevant people are prevented from being disturbed by hearing, which is beneficial to improving user experience.

The principle of the directional sounding component is to utilize the high directivity, the frequency superposition effect and the high-frequency attenuation effect of ultrasonic waves, and to enable difference frequency signals of the ultrasonic waves to be in an audible sound range by selecting ultrasonic waves with proper frequencies so as to realize directional sounding.

Wherein, the preset sounding angle can be preset and generated, namely is a fixed value; it may also be determined dynamically, i.e. the angle value may be adjusted dynamically. In some of the alternative embodiments of the present invention, the directional sounding assembly comprises a sounding layer and a driving circuit layer which are connected. The driving circuit layer is used for providing driving signals for the sounding layer. The sounding layer analyzes according to the driving signal to obtain a preset sounding angle, and sounds according to the preset sounding angle. In this embodiment, that is, the preset sound emission angle may be dynamically determined according to the driving signal. The driving signal can be generated according to the sounding angle input by the user on the interactive interface, and the preset sounding angle is the angle range input by the user in the case; the display module can also be generated according to the visual angle of the display module, for example, the display module has a peep-proof function, and the preset sounding angle is the same as the visual angle of the display module under the condition. When the peep-proof function is started, the visual angle of the display module is smaller than that in the non-peep-proof mode.

In some alternative embodiments, the display module has a sharing mode and a peep-proof mode based on realizing directional sounding of the display module. The light-emitting angle in the sharing mode is larger than that in the peep-proof mode. The display pictures can be switched, shared and peeped, meanwhile, the screen can emit sound directionally according to the requirements, the sound field can be adjusted in a partitioning mode, and the wide-angle sound field and the directional sound field can be switched; therefore, the combination of screen sounding and display, namely the simultaneous orientation of a sound field and a light field, is realized, and a driver, a secondary driving and a rear passenger can all have independent video and audio spaces in the vehicle. Preferably, the light emitting angle of the screen in the peep-proof mode is matched with the directional sounding angle of the directional sounding assembly; thus being beneficial to further improving the user experience.

Further, in some embodiments, the directional sounding assembly may turn on or off the directional sounding mode, and sound is generated by the directional sounding assembly when the directional sounding mode is turned on; when the directional sound emission mode is turned off, sound emission is performed through the device speaker. When the display module is in a sharing mode, the directional sounding assembly is in a closing directional sounding mode, namely, all people in the vehicle can hear sounding. When the display module is opened in the peep-proof mode, the directional sounding assembly is opened in the directional sounding mode, and the audience with directional sounding is the same as the audience in the peep-proof mode of the display module. Therefore, the display orientation and the sounding orientation can be controlled in a linkage manner, so that all people in the vehicle have independent audio-visual experience, and the experience of all passengers is improved.

For example, after the peep-proof mode is started on the display screen in front of the passenger, the driver is not interfered by any vision and hearing, and the driver can concentrate on driving the vehicle and road information in front, so that the experience of the host driver and the passenger is improved, and the safety of the vehicle is guaranteed. When the vehicle stops, after the display screen in front of the passenger plane starts the sharing mode, the driver can watch the display content of the passenger plane together.

Example 1

In this embodiment, the directional sounding component is disposed in a frame area of the cover plate. Referring to fig. 5, the display module disclosed in this embodiment further includes a birefringence-controlled liquid crystal cell (Electrically Controlled Birefringence cell, ECB cell) module 23 located between the backlight module 21 and the cover plate 22. That is, in this embodiment, the display module includes, in order along the light emitting direction of the display module, a backlight module 21, a birefringence control type liquid crystal cell module 23, and a cover plate 22. Wherein, the birefringence control type liquid crystal cell module 23 comprises at least one birefringence control type liquid crystal cell. In some alternative embodiments, the birefringence-controlling liquid crystal cell module described above includes one or two birefringence-controlling liquid crystal cells, for the purpose of reducing the thickness of the display module.

The directional sounding components can be arranged on one side of the display area only, and can also be arranged around multiple sides of the display area, for example, the directional sounding components are arranged on four sides of the display area; the present application is not limited in this regard.

In this embodiment, based on the birefringence control type liquid crystal cell module, the display module is realized to have a sharing mode and a peep-proof mode. Specifically, the birefringence control type liquid crystal box can realize different light emitting angles by adjusting the form of internal liquid crystal such as the inclination angle through voltage, so that the sharing mode and the peep-proof mode of the display module are respectively realized. The light-emitting angle of the display module in the sharing mode is larger than that in the peep-proof mode. In a preferred embodiment, the birefringence control type liquid crystal cell module includes two birefringence control type liquid crystal cells stacked in sequence along the thickness direction of the display module, so that the viewing angle of the display module is narrower, thereby enhancing the peep-proof effect.

In this embodiment, the directional sounding component is a piezoelectric film transducer, and the backlight module is a local dimming light source, that is, a direct type light source is adopted. The regional dimming light source can enable black state of the peep-proof display module to be pure black, dynamic contrast is higher, display is clearer, and display effect is better especially in a sharing mode.

The piezoelectric film may be, for example, a PVDF (polyvinylidene fluoride) film. Referring to fig. 6, the piezoelectric thin film transducer includes a plurality of array elements 61. The array elements can form a transduction bead array in a mode of multiple rows of the array elements being arranged at intervals.

Referring to fig. 7, in the present embodiment, the array element 61 in the piezoelectric thin film transducer includes a sounding layer 71 and a driving circuit layer 72, and the sounding layer 71 and the driving circuit layer 72 are connected through a pin 73. The driving circuit layer 72 is used for driving the sounding layer 71 to sound. The surface of the array element, namely the surface of the sounding layer, is provided with fine holes for sounding. It should be noted that fig. 6 and fig. 7 only show 3 array elements in the piezoelectric thin film transducer by way of example, and the number of the array elements in the piezoelectric thin film transducer is not limited in this application.

The sounding layer 71 includes a first matching layer, a second matching layer, an optically transparent adhesive, a first electrode, a piezoelectric layer, and a second electrode, which are laminated in this order in the thickness direction thereof. The first matching layer may be a silicon oxide layer, the second matching layer may be a silicon film layer, and the piezoelectric layer may be polyvinylidene fluoride (PVDF), among others, by way of example. The first electrode and the second electrode may be ITO (tin-indium oxide) electrodes. The specific materials of the first matching layer, the second matching layer, the piezoelectric layer and the two electrodes are not limited to this. Under the drive of electric potential, the piezoelectric film transducer vibrates to emit sound waves, and the sound waves are distributed through the array elements, so that the directional sound production effect is achieved. The side surface of the piezoelectric layer cannot deform and displace in the process of emitting sound waves through vibration.

The first matching layer and the second matching layer are used for improving the energy efficiency of ultrasonic wave propagation in a medium so as to increase the sound pressure level and the propagation distance. The optically transparent adhesive is used for adhering the second matching layer and the first electrode. The first electrode and the second electrode are used for providing electric potential to the piezoelectric layer, and polarities of the first electrode and the second electrode are opposite. The piezoelectric layer is used for vibrating and sounding after being driven by electric potential.

In some alternative embodiments, the spacing between adjacent array elements in the array of array elements is d, and the wavelength of the acoustic wave is λ, where d/λ is less than or equal to 0.5. Therefore, when the piezoelectric layer vibrates to emit sound waves, side lobes and grating lobes of the sound waves can be effectively restrained, so that the sound wave directivity is better, and the directional sound production effect of the directional sound production assembly is better. For example, when the wavelength of the sound wave is 8.6mm, the distance between adjacent array elements in the array element array is less than or equal to 4.3mm. Preferably, the array element spacing is 2.5mm, in which case the directionality of the acoustic wave at a wavelength of 8.6mm is better.

In some alternative embodiments, referring to a radiation direction curve 81 in fig. 8, when the piezoelectric thin film transducer controls the resonant frequency to operate at 40kHz based on the driving signal provided by the driving circuit layer, an included angle between the corresponding sounding angle and the sounding center line is less than or equal to 30 °; therefore, when the resonant frequency is 40kHz, the directional sounding component has good directionality within +/-30 degrees. Referring to a radiation direction curve 82 in fig. 8, when the resonant frequency of the piezoelectric thin film transducer is 30kHz, the included angle between the corresponding sounding angle and the sounding center line is less than or equal to 45 °; therefore, when the resonant frequency is 30kHz, the directional sounding component has good directionality within +/-45 degrees. Wherein, the sounding center line is perpendicular to the plane of the frame area of the cover plate.

In a preferred embodiment, referring to the radiation direction curve 83 in fig. 8, the resonant frequency of the piezoelectric film transducer is 20kHz, in which case the sound wave generated by the vibration of the piezoelectric layer does not generate side lobes, so that the directionality of the sound wave is better.

In some alternative embodiments, an optical film may be further included between the backlight module and the birefringence-controlling liquid crystal cell module along the light-emitting direction of the display module. A display cell may also be included between the birefringence-controlled lc cell module and the cover plate. The invention does not limit the structural composition of the display module.

Illustratively, the bezel area width of the cover plate may range from 13mm to 14mm, preferably the bezel area width is 13.58mm. The number of array elements in the piezoelectric film transducer can be 20, the diameter of the array elements is 10mm, the height is 8mm, and the array element spacing can be 15.32mm. The values of the parameters are not limited in this application.

Example two

In this embodiment, the directional sounding component is a piezoelectric film transducer and is disposed in a frame region of the cover plate. In the implementation, the directional sounding component can be arranged on one side of the display area only, or can be arranged around multiple sides of the display area, for example, the directional sounding components are arranged on four sides of the display area; the present application is not limited in this regard.

In this embodiment, the array element in the piezoelectric thin film transducer includes a sounding layer and a driving circuit layer, and the sounding layer and the driving circuit layer are connected through pins. The driving circuit layer is used for driving the sounding layer to sound. The surface of the array element, namely the surface of the sounding layer, is provided with fine holes for sounding.

The sounding layer comprises a first matching layer, a second matching layer, an optically transparent adhesive, a first electrode, a piezoelectric layer and a second electrode which are sequentially laminated along the thickness direction of the sounding layer. The first matching layer may be a silicon oxide layer, the second matching layer may be a silicon film layer, and the piezoelectric layer may be polyvinylidene fluoride (PVDF), among others, by way of example. The first electrode and the second electrode may be ITO (tin-indium oxide) electrodes. The specific materials of the first matching layer, the second matching layer, the piezoelectric layer and the two electrodes are not limited to this. Under the drive of electric potential, the piezoelectric film transducer vibrates to emit sound waves, and the sound waves are distributed through the array elements, so that the directional sound production effect is achieved. The side surface of the piezoelectric layer cannot deform and displace in the process of emitting sound waves through vibration.

In some alternative embodiments, when the piezoelectric thin film transducer controls the resonant frequency to work at 40kHz based on the driving signal provided by the driving circuit layer, the included angle between the corresponding sounding angle and the sounding center line is less than or equal to 30 °; therefore, when the resonant frequency is 40kHz, the directional sounding component has good directionality within +/-30 degrees. When the resonant frequency of the piezoelectric film transducer is 30kHz, the included angle between the corresponding sounding angle and the sounding center line is smaller than or equal to 45 degrees; therefore, when the resonant frequency is 30kHz, the directional sounding component has good directionality within +/-45 degrees. Wherein, the sounding center line is perpendicular to the plane of the frame area of the cover plate.

In a preferred embodiment, the resonant frequency of the piezoelectric film transducer is 20kHz, and in this case, the sound wave emitted by the vibration of the piezoelectric layer does not generate side lobes, so that the directionality of the sound wave is better.

In this embodiment, the backlight module includes a first backlight module and a second backlight module that are stacked, and a light emitting angle of the second backlight module is greater than a light emitting angle of the first backlight module. That is, the first backlight module is used for providing a light source in the peep-proof mode, and the second backlight module is used for providing a light source in the sharing mode, so that the peep-proof and sharing modes can be freely switched. In the peep-proof mode, the first backlight module is turned on, and the second backlight module is turned off. In the sharing mode, the second backlight module is turned on, and the first backlight module is turned off. Based on the double backlight module structure, the display module is provided with a sharing mode and a peep-proof mode. The light-emitting angle of the display module in the sharing mode is larger than that in the peep-proof mode. Compared with the technical scheme of adopting the cooperation of the regional dimming light source and the ECB module in the first embodiment, the scheme of adopting the double backlight modules in the first embodiment has better peep-proof performance.

The first backlight module may include an LGP (Light Guiding Panel, light guide plate), a side-entrance light source, an optical film, and an LCF (light control film, light anisotropic film).

In some alternative embodiments, the display module may further include a birefringence-controlled liquid crystal cell (Electrically Controlled Birefringence cell, ECB cell) module disposed between the backlight module and the cover plate. That is, along the light emitting direction of the display module, the display module sequentially includes a backlight module, a birefringence control type liquid crystal cell module, and a cover plate. Wherein, the birefringence control type liquid crystal box module comprises at least one birefringence control type liquid crystal box. In this embodiment, compared with the technical scheme of using only the dual backlight module structure and the ECB module, the technical scheme of using no ECB module has better peeping-proof effect.

In some alternative embodiments, the birefringence-controlling liquid crystal cell module described above includes one or two birefringence-controlling liquid crystal cells, for the purpose of reducing the thickness of the display module. In a preferred embodiment, the birefringence control type liquid crystal cell module includes two birefringence control type liquid crystal cells stacked in sequence along the thickness direction of the display module, so that the viewing angle of the display module is narrower, and the peep-proof effect is enhanced.

Example III

In this embodiment, the directional sounding component is a Micro-Electro-Mechanical System (MEMS) system transducer disposed on a side of the cover plate facing away from the backlight module along a thickness direction of the display module, and the MEMS system transducer covers the cover plate. That is, the mems transducer is disposed over the entire surface of the cover plate, and the mems transducer can produce sound. This embodiment facilitates the realization of a narrow bezel of the display module.

Referring to fig. 9, the mems transducer includes a first protective layer 91, a first conductive layer 92, a core layer 93, a second conductive layer 94, and a second protective layer 95 sequentially stacked in the thickness direction thereof. The core layer 93 is a middle vibratable film, the core layer 93 has a plurality of parametric arrays, the first conductive layer 92 and the second conductive layer 94 are electrically connected to the core layer, and are used for providing electric potential to the core layer, so as to control the opening or closing of each parametric array to sound, so as to realize directional sound production. Illustratively, the first protective layer 91 and the second protective layer 95 may be made of PET (polyethylene terephthalate) material, which is not limited in this application.

Wherein, each parametric array in the core layer 93 can independently control sounding through signals, thereby realizing the zoned sounding of the micro-electromechanical system transducer. Referring to fig. 10 and 11, the parametric array in the core layer includes a first region 101, a second region 102, and a third region 103. In fig. 10, the first region 101, the second region 102, and the third region 103 are all turned on for directional sounding. In fig. 11, the first region 101 and the third region 103 are turned off for directional sounding, and the second region 102 is turned on for directional sounding.

When the main driver needs to answer a private phone or other passengers need to rest in specific application, the acoustic parametric array sounding corresponding to a specific subarea can be controlled, and the effect of sound orientation of the main driver or other passengers is obtained. The sounding angle of the directional sounding component can be switched between the wide angle and the orientation, and the matched display module can be switched between the peep-proof mode and the sharing mode, so that the application scene of meeting the main driving and focusing driving requirements in the vehicle and sharing entertainment requirements of other passengers can be realized.

In this embodiment, the backlight module is a local dimming light source. The regional dimming light source can enable black state of the peep-proof display module to be pure black, dynamic contrast is higher, display is clearer, and display effect is better especially in a sharing mode.

In this embodiment, the display module further includes a birefringence control type liquid crystal cell (Electrically Controlled Birefringence cell, ECB cell) module disposed between the backlight module and the cover plate. That is, in this embodiment, along the light emitting direction of the display module, the display module includes a backlight module, a birefringence control type liquid crystal cell module, and a cover plate in sequence. Wherein, the birefringence control type liquid crystal box module comprises at least one birefringence control type liquid crystal box. In some alternative embodiments, the birefringence-controlling liquid crystal cell module described above includes one or two birefringence-controlling liquid crystal cells, for the purpose of reducing the thickness of the display module.

Based on the birefringence control type liquid crystal box module, the display module is provided with a sharing mode and a peep-proof mode. Specifically, the birefringence control type liquid crystal box can realize different light emitting angles by adjusting the form of internal liquid crystal such as the inclination angle through voltage, so that the sharing mode and the peep-proof mode of the display module are respectively realized. The light-emitting angle of the display module in the sharing mode is larger than that in the peep-proof mode. In a preferred embodiment, the birefringence control type liquid crystal cell module includes two birefringence control type liquid crystal cells stacked in sequence along the thickness direction of the display module, so that the viewing angle of the display module is narrower, thereby enhancing the peep-proof effect.

Example IV

The micro-electromechanical system transducer comprises a first protective layer, a first conductive layer, a core layer, a second conductive layer and a second protective layer which are sequentially laminated along the thickness direction of the micro-electromechanical system transducer. The core layer is a film with a vibratable middle, the core layer is provided with a plurality of parametric array arrays, the first conductive layer and the second conductive layer are electrically connected with the core layer and are used for providing electric potential for the core layer so as to control the opening or closing of each parametric array to produce sound and realize directional sound production.

Wherein, each parametric array in the core layer can independently control sounding through signals, thereby realizing the zoned sounding of the micro-electromechanical system transducer. The first protective layer and the second protective layer may be made of PET (polyethylene terephthalate) material, which is not limited in this application.

In this embodiment, the backlight module is a dual backlight source, that is, includes a first backlight module and a second backlight module stacked together, and the light emitting angle of the second backlight module is greater than the light emitting angle of the first backlight module. That is, the first backlight module is used for providing a light source in the peep-proof mode, and the second backlight module is used for providing a light source in the sharing mode, so that the peep-proof and sharing modes can be freely switched. In the peep-proof mode, the first backlight module is turned on, and the second backlight module is turned off. In the sharing mode, the second backlight module is turned on, and the first backlight module is turned off. Based on the double backlight module structure, the display module is provided with a sharing mode and a peep-proof mode. The light-emitting angle of the display module in the sharing mode is larger than that in the peep-proof mode. Compared with the technical scheme of adopting the regional dimming light source and ECB module to match in the first embodiment and the third embodiment, the scheme of adopting the double backlight modules has better peep-proof performance.

In some optional embodiments of the present application, the display module has a sharing mode and a peep-proof mode based on realizing directional sounding of the display module. When the display module is in the sharing mode, the directional sounding assembly sounds towards a plurality of sounding angles. When the display module is in the peep-proof mode, the directional sounding assembly only sounds towards one sounding angle.

Further, on the basis of the above embodiment, the display module is controlled based on the driving chip to switch between the sharing mode and the peep-proof mode. The directional sounding assembly comprises a sounding layer and a driving circuit layer which are connected. The driving circuit layer is used for driving the sounding layer to sound. The driving circuit layer is electrically connected with the driving chip; thereby realizing the linkage control of the display module and the directional sounding component.

Specifically, in this embodiment, when the driving chip controls the display module to operate in the sharing mode, the driving circuit layer drives the sounding layer to sound at a plurality of sounding angles. When the driving chip controls the display module to work in the peep-proof mode, the driving circuit layer drives the sounding layer to sound at a sounding angle.

In some optional embodiments of the present application, the display module has a sharing mode and a peep-proof mode based on realizing directional sounding of the display module. And when the display module is in the sharing mode and the peep-proof mode, the directional sounding assembly only sounds towards one sounding angle, and the sounding angle of the directional sounding assembly in the corresponding sharing mode is larger than that in the corresponding peep-proof mode. That is, when the display module is in the sharing mode, the directional sounding assembly can sound only towards one large sounding angle according to the requirement; alternatively, sound may be emitted simultaneously toward a plurality of small angles.

It should be noted that, all the embodiments disclosed in the present application may be freely combined, and the technical solution obtained after combination is also within the protection scope of the present application.

An embodiment of the present invention further provides a display device, where the display device includes the display module described in the foregoing embodiment. The detailed structural features and advantages of the display module may be referred to the description of the above embodiments, and will not be repeated here.

It is to be understood that the type of the display device may be any one of an Organic Light-Emitting Diode (OLED) display device, a QLED (Quantum Dot Light Emitting Diodes) display device, a micro LED (micro LED) display device, or the like, and the present invention is not particularly limited thereto.

The display device provided by the above-described embodiments may be any device that displays an image whether in motion (e.g., video) or stationary (e.g., still image) and whether textual or pictorial. More particularly, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices. Such as, but not limited to, mobile telephones, wireless devices, personal Data Assistants (PDAs), hand-held or portable computers, GPS receivers/navigators, cameras, MP4 video players, video cameras, game consoles, wrist watches, clocks, calculators, television monitors, flat panel displays, computer monitors, auto displays (e.g., odometer display, etc.), navigators, cabin controllers and/or displays, displays of camera views (e.g., display of a rear view camera in a vehicle), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures, among others.

In summary, the display module and the display device provided by the invention have at least the following advantages:

according to the display module and the display device disclosed by the embodiment of the invention, the directional sounding assembly is arranged on the display module, so that directional sounding can be performed according to the preset sounding angle, the respective audio-visual environment requirements of passengers in different seats in the vehicle are met, the situation that irrelevant people are interfered by sound can be avoided, and the riding experience of the passengers in the vehicle is improved.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. The utility model provides a display module assembly, its characterized in that includes backlight unit and apron, the apron includes the display area and is located the frame district of at least one side of display area, the apron is followed deviate from on the thickness direction of display module assembly backlight unit's one side or the frame district is equipped with directional sounding subassembly, directional sounding subassembly is used for sounding according to preset sounding angle.

2. The display module of claim 1, further comprising a birefringence-controlled liquid crystal cell module between the backlight module and the cover plate, the birefringence-controlled liquid crystal cell module comprising one or two birefringence-controlled liquid crystal cells.

3. The display module of claim 1, wherein the backlight module comprises a first backlight module and a second backlight module stacked; the display module is provided with a sharing mode and a peep-proof mode, and the light-out angle in the sharing mode is larger than that in the peep-proof mode; the light-emitting angle of the second backlight module is larger than that of the first backlight module.

4. The display module of claim 1, wherein the directional sounding assembly comprises a sounding layer and a driving circuit layer connected with each other, the driving circuit layer is used for providing a driving signal for the sounding layer, and the sounding layer analyzes a preset sounding angle according to the driving signal and sounds according to the preset sounding angle.

5. The display module of claim 1, wherein the directional sound emitting assembly is a piezoelectric film transducer disposed in the bezel area, the piezoelectric film transducer disposed on at least one side of the bezel area.

6. The display module of claim 5 wherein said piezoelectric film transducer comprises a plurality of array elements, the spacing between adjacent array elements being d, the wavelength of the acoustic wave being λ, wherein d/λ is less than or equal to 0.5.

7. The display module of claim 5, wherein when the resonant frequency of the piezoelectric thin film transducer is 40kHz, an included angle between a corresponding sounding angle and a sounding center line is less than or equal to 30 °;

when the resonance frequency of the piezoelectric film transducer is 30kHz, the included angle between the corresponding sounding angle and the sounding center line is smaller than or equal to 45 degrees.

8. The display module of claim 5, wherein the piezoelectric thin film transducer includes a first matching layer, a second matching layer, an optically transparent adhesive, a first electrode, a piezoelectric layer, and a second electrode, which are sequentially stacked in a thickness direction thereof.

9. The display module of claim 1, wherein the directional sound assembly is a mems transducer disposed on a side of the cover plate facing away from the backlight module in a thickness direction of the display module, and the mems transducer covers the cover plate.

10. The display module of claim 9, wherein the mems transducer comprises a first protective layer, a first conductive layer, a core layer, a second conductive layer, and a second protective layer laminated sequentially along a thickness direction thereof; the core layer is provided with a plurality of parametric array arrays, and the first conductive layer and the second conductive layer are electrically connected with the core layer.

11. The display module of claim 1, wherein the display module has a sharing mode and a peep-proof mode, wherein an exit angle in the sharing mode is greater than an exit angle in the peep-proof mode; the directional sounding component sounds to a plurality of sounding angles in the corresponding sharing mode, and sounds to one sounding angle in the corresponding peep-proof mode.

12. The display module of claim 11, wherein the display module is configured to switch between the sharing mode and the privacy mode based on driver chip control; the directional sounding component comprises a sounding layer and a driving circuit layer which are connected, and the driving circuit layer is used for driving the sounding layer to sound; the driving circuit layer is electrically connected with the driving chip;

when the driving chip controls the display module to work in a sharing mode, the driving circuit layer drives the sounding layer to sound at a plurality of sounding angles;

when the driving chip controls the display module to work in the peep-proof mode, the driving circuit layer drives the sounding layer to sound at a sounding angle.

13. The display module of claim 1, wherein the display module has a sharing mode and a peep-proof mode, wherein an exit angle in the sharing mode is greater than an exit angle in the peep-proof mode; the directional sounding assembly is used for sounding to a sounding angle in the sharing mode and the peep-proof mode, and the sounding angle of the directional sounding assembly in the sharing mode is larger than that in the peep-proof mode.

14. A display device comprising a display module according to any one of claims 1-13.