Display device

Abstract

The invention discloses a display device for realizing three-dimensional display and generating ultrasonic waves. The display device comprises a display panel, a rigid light-transmitting cover plate, a light-transmitting piezoelectric functional layer, a lens array layer and a plurality of cavities. The rigid light-transmitting cover plate is located on the light-emitting side of the display panel. The light-transmitting piezoelectric functional layer is located between the rigid light-transmitting cover plate and the display panel and comprises a first light-transmitting electrode layer, a second light-transmitting electrode layer and a piezoelectric material layer. The first light-transmitting electrode layer is arranged close to the display panel, the second light-transmitting electrode layer is arranged close to the rigid light-transmitting cover plate, and the piezoelectric material layer is located between the first light-transmitting electrode layer and the second light-transmitting electrode layer. The lens array layer is located between the rigid light-transmitting cover plate and the display panel and comprises a plurality of lenses. One lens comprises a lens cambered surface, and the lens cambered surface protrudes towards the rigid light-transmitting cover plate. And the plurality of cavities are positioned between the plurality of lenses and the rigid light-transmitting cover plate or the light-transmitting piezoelectric functional layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device. BACKGROUND

[0002] With the development of display technology, three-dimensional (3D) display is widely concerned in the fields of entertainment, medical treatment, industrial design, virtual / augmented reality, etc. due to its immersion and spatial information expression capability. Existing naked-eye 3D display technologies mainly include lenticular, parallax barrier, integral imaging / microlens array, light field display and holographic display, etc. These technologies introduce angle selection or light field reconstruction between pixels and observers, so that different views are received at different observation directions, thereby generating parallax and depth perception. However, the existing 3D display devices generally have the problem of single function. SUMMARY

[0003] Embodiments of the present application provide a display device to realize three-dimensional (3D) display and generate ultrasonic waves, so as to at least partially solve the above technical problems.

[0004] In order to achieve the above purpose, according to a first aspect of the present application, a display device is provided, comprising a display panel, a rigid light-transmitting cover plate, a light-transmitting piezoelectric functional layer, a lens array layer and a plurality of cavities. The rigid light-transmitting cover plate is located on the light-emitting side of the display panel. The light-transmitting piezoelectric functional layer is located between the rigid light-transmitting cover plate and the display panel, and comprises a first light-transmitting electrode layer, a second light-transmitting electrode layer and a piezoelectric material layer. The first light-transmitting electrode layer is arranged close to the display panel, the second light-transmitting electrode layer is arranged close to the rigid light-transmitting cover plate, and the piezoelectric material layer is located between the first light-transmitting electrode layer and the second light-transmitting electrode layer. The lens array layer is located between the rigid light-transmitting cover plate and the display panel, and comprises a plurality of lenses. One of the lenses comprises a lens arc surface, which protrudes towards the rigid light-transmitting cover plate. A plurality of cavities are located between the plurality of lenses and the rigid light-transmitting cover plate or the light-transmitting piezoelectric functional layer.

[0005] Optionally, the lens array layer is located between the piezoelectric material layer and the second light-transmitting electrode layer, the second light-transmitting electrode layer covers the lens arc surfaces of the plurality of lenses, and a plurality of cavities are located between the second light-transmitting electrode layer and the rigid light-transmitting cover plate.

[0006] Optionally, the material of the lens array layer is the same as the material of the piezoelectric material layer.

[0007] Optionally, the lens array layer and the piezoelectric material layer are an integral structure.

[0008] Optionally, the material of the lens array layer is different from the material of the piezoelectric material layer.

[0009] Optionally, the lens array layer is located between the second light-transmitting electrode layer and the rigid light-transmitting cover plate, and the plurality of cavities are located between the lens array layer and the rigid light-transmitting cover plate.

[0010] Optionally, the lens array layer is located between the display panel and the first light-transmitting electrode layer, and the plurality of cavities are located between the lens array layer and the light-transmitting piezoelectric functional layer.

[0011] Optionally, the display device further comprises a light-transmitting substrate, and the light-transmitting substrate is located between the light-transmitting piezoelectric functional layer and the display panel.

[0012] Optionally, the light-transmitting piezoelectric functional layer is in contact with the display panel.

[0013] Optionally, at least one of the first light-transmitting electrode layer and the second light-transmitting electrode layer comprises a plurality of electrodes arranged at intervals, and one of the electrodes overlaps at least two of the lenses.

[0014] In the display device of the embodiments of the present application, the light emitted by the display panel is processed by the plurality of lenses of the lens array layer to achieve three-dimensional (3D) display. Moreover, the plurality of cavities are located between the plurality of lenses and the rigid light-transmitting cover plate or the light-transmitting piezoelectric functional layer, and the vibration generated by the piezoelectric material layer under the action of the electric field is transmitted to the plurality of cavities through the lens array layer, so as to push the air inside the plurality of cavities to generate ultrasonic waves. Therefore, the lens array layer is not only used for processing the light emitted by the display panel to achieve 3D display, but also used for forming the plurality of cavities to generate ultrasonic waves, that is, through multiplexing of the lens array layer, the display device has the functions of 3D display and ultrasonic wave generation, and thus the display device has a plurality of different functions, while the structure of the display device is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cross-sectional structure schematic diagram of a display device provided in an exemplary embodiment of the present application; Figure 2 is a cross-sectional structure schematic diagram of another display device provided in an exemplary embodiment of the present application; Figure 3 is a cross-sectional structure schematic diagram of still another display device provided in an exemplary embodiment of the present application; Figure 4 is a cross-sectional structure schematic diagram of still another display device provided in an exemplary embodiment of the present application; Figure 5is a sectional structure schematic diagram of still another display device provided in the exemplary embodiments of the present application.

[0016] Legend of reference signs: 100, display device; 1, display panel; 2, rigid light-transmitting cover plate; 3, light-transmitting piezoelectric functional layer; 31, first light-transmitting electrode layer; 311, first electrode; 32, second light-transmitting electrode layer; 33, piezoelectric material layer; 4, lens array layer; 41, lens; 42, lens arc surface; 43, light-transmitting base; 5, cavity; 6, ultrasonic driving circuit; 7, light-transmitting substrate. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0018] Please refer to Figures 1 to 3 The embodiments of the present application provide a display device 100. The display device 100 comprises a display panel 1, a rigid light-transmitting cover plate 2, a light-transmitting piezoelectric functional layer 3, a lens array layer 4, and a plurality of cavities 5.

[0019] The display panel 1 can comprise any one of an organic light-emitting diode display panel, a liquid crystal display panel, a micro light-emitting diode (Micro-LED) display panel, a mini light-emitting diode (Mini-LED) display panel, and a quantum dot display panel. Exemplarily, the display panel 1 is an organic light-emitting diode display panel, but is not limited thereto.

[0020] The rigid light-transmitting cover plate 2 is located at the light-emitting side of the display panel 1, and thus the rigid light-transmitting cover plate 2 protects the display panel 1 and the like below. The rigid light-transmitting cover plate 2 can comprise a glass cover plate.

[0021] The lens array layer 4 is located between the rigid light-transmitting cover plate 2 and the display panel 1, and comprises a plurality of lenses 41. One lens 41 comprises a lens arc surface 42, which protrudes towards the rigid light-transmitting cover plate 2. The light emitted by the display panel 1 is focused after passing through the plurality of lens arc surfaces 42 of the lens array layer 4, so that the light beams output by the display panel 1 can be respectively focused to the left eye or right eye of a viewer, thereby enabling the display device 100 to achieve 3D display.

[0022] In some embodiments, the lens arc surface 42 can include at least one of a circular arc surface and an elliptical arc surface, so that the lens arc surface 42 can focus the light emitted by the display panel 1.

[0023] In some embodiments, the plurality of lenses 41 can be arranged along one direction, for example, along the length direction or the width direction of the display panel 1. In some embodiments, the plurality of lenses 41 can also be arranged along two intersecting directions, for example, along the length direction and the width direction of the display panel 1.

[0024] In some embodiments, the lens 41 can be in a column shape, for example, a semi-circular column; or, in a semi-spherical shape.

[0025] The lens 41 has a high refractive index. In some embodiments, the refractive index of the lens 41 can be greater than or equal to 1.65. In some embodiments, the lens 41 can include a high refractive index medium, which includes but is not limited to at least one of titanium dioxide, silicon nitride, and silicon dioxide.

[0026] In some embodiments, the light-transmitting piezoelectric functional layer 3 is located between the rigid light-transmitting cover plate 2 and the display panel 1. The light-transmitting piezoelectric functional layer 3 includes a first light-transmitting electrode layer 31, a second light-transmitting electrode layer 32, and a piezoelectric material layer 33. The first light-transmitting electrode layer 31 is arranged close to the display panel 1, and the second light-transmitting electrode layer 32 is arranged close to the rigid light-transmitting cover plate 2. The piezoelectric material layer 33 is located between the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32. The plurality of cavities 5 are located between the plurality of lenses 41 and the rigid light-transmitting cover plate 2 or the light-transmitting piezoelectric functional layer 3.

[0027] When a high-frequency alternating voltage signal is applied to the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32, a rapidly changing electric field is formed between the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32. The piezoelectric material layer 33 will undergo periodic and extremely small deformation under the action of the electric field; and when the direction of the electric field changes, the piezoelectric material layer 33 will alternately stretch and compress, so the piezoelectric material layer 33 will vibrate. This phenomenon of converting the electrical energy applied to the first electrode 311 layer and the second electrode layer into the vibrational mechanical energy of the piezoelectric material layer 33 is called inverse piezoelectric effect. The vibration of the piezoelectric material layer 33 is transmitted to the plurality of cavities 5 through the lens array layer 4, pushing the air in the plurality of cavities 5 to generate ultrasonic waves with a frequency higher than the human ear threshold (>20 kHz), which are transmitted into the air. Therefore, the lens array layer 4 not only functions to process the light emitted by the display panel 1 to achieve 3D display, but also functions to form the plurality of cavities 5 to generate ultrasonic waves, i.e., through multiplexing of the lens array layer 4, so that the display device 100 has the functions of 3D display and ultrasonic wave generation, thereby making the display device 100 have a plurality of different functions while simplifying the structure of the display device 100.

[0028] It should be noted that, in the case that the display panel 1 generates ultrasonic waves by the cooperation of the light-transmitting piezoelectric functional layer 3 and the cavity 5, the ultrasonic waves can be applied to directional sound emission technology and mid-air haptic feedback, so that the display device 100 simultaneously integrates the composite functions of 3D display, directional sound emission and mid-air haptic feedback. The directional sound emission technology is based on the directional propagation characteristics of ultrasonic waves, modulates audible sound signals onto ultrasonic wave carriers to form a narrow sound beam similar to a "sound column", so that the sound is only transmitted in a specific direction, effectively avoiding noise interference and realizing "local delivery" of sound. Moreover, the core of the mid-air haptic feedback is to form a mechanical focal point in the air by using ultrasonic wave radiation pressure, and simulate the real haptic feeling such as roughness and damping feeling when touching an object by accurately controlling the vibration mode (such as rotation or combination of specific frequency) of the focal point.

[0029] In some embodiments, the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32 can include a light-transmitting conductive material such as indium tin oxide or indium zinc oxide.

[0030] In some embodiments, referring to Figure 1 , the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32 can each be a full-surface electrode layer, so that the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32 do not need to be subjected to patterning processing, thereby simplifying the manufacturing process of the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32.

[0031] In some embodiments, referring to Figure 2 and Figure 3 , at least one of the first light-transmitting electrode layer 31 and the second light-transmitting electrode layer 32 includes a plurality of electrodes arranged at intervals, and one electrode overlaps at least two lenses 41. In this way, one electrode can adjust the ultrasonic waves of one frequency generated by the cavity 5 defined by at least two lenses 41, and a plurality of electrodes can adjust the ultrasonic waves of a plurality of different characteristics (for example, frequency) generated by the corresponding lenses 41.

[0032] In some embodiments, referring to Figure 2 and Figure 3 , the first light-transmitting electrode layer 31 can include a plurality of first electrodes 311 arranged at intervals, and the second light-transmitting electrode layer 32 can be a full-surface electrode layer. In this way, when the second light-transmitting electrode layer 32 is located on the lens 41, the second light-transmitting electrode layer 32 does not need to be patterned, and only the planar first light-transmitting electrode layer 31 needs to be patterned, thereby reducing the difficulty of patterning.

[0033] It can be understood that the first light-transmissive electrode layer 31 can also be a full-surface electrode layer, and the second light-transmissive electrode layer 32 includes a plurality of second electrodes arranged at intervals; or the first light-transmissive electrode layer 31 includes a plurality of first electrodes 311 arranged at intervals, and the second light-transmissive electrode layer 32 includes a plurality of second electrodes arranged at intervals, and the second electrodes overlap the first electrodes 311.

[0034] In some embodiments, the piezoelectric material layer 33 can include at least one of, but not limited to, a single crystal material, an oxide, and a nitride. The single crystal material includes at least one of quartz, lithium niobate, and lithium tantalate. The oxide includes, but is not limited to, zinc oxide and titanium dioxide. The nitride includes, but is not limited to, aluminum nitride.

[0035] In some embodiments, the display device 100 further includes an ultrasonic driving circuit 6 connected to the first light-transmissive electrode layer 31 and the second light-transmissive electrode layer 32. The ultrasonic driving circuit 6 is configured to apply corresponding driving voltages to the first light-transmissive electrode layer 31 and the second light-transmissive electrode layer 32, so that the piezoelectric material layer 33 can generate vibrations. In some embodiments, the ultrasonic driving circuit 6 can be arranged outside the display device 100, or can be integrated inside the display device 100, for example, inside the display panel 1.

[0036] In some embodiments, referring to Figures 1 to 3 , the lens array layer 4 is located between the piezoelectric material layer 33 and the second light-transmissive electrode layer 32. The second light-transmissive electrode layer 32 covers the lens curved surfaces 42 of the plurality of lenses 41, and the second light-transmissive electrode layer 32 includes a plurality of arc-shaped portions, one arc-shaped portion covering one lens curved surface 42. The plurality of cavities 5 are located between the second light-transmissive electrode layer 32 and the rigid light-transmissive cover plate 2. In this way, when the piezoelectric material layer 33 generates vibrations, the vibrations can be directly transmitted to the plurality of cavities 5 through the lens array layer 4 and the second light-transmissive electrode layer 32, improving the transmission efficiency of the vibrations and shortening the time for generating ultrasonic waves. Moreover, when the vibrations generated by the piezoelectric material layer 33 drive the vibrations at the bottom of the cavity 5, the entire cavity 5 structure acts like a micro-piston, concentrating the vibration energy upward to the cover plate glass above, and the corresponding area of the cover plate glass becomes an effective ultrasonic wave radiation surface. This structure helps to focus the sound energy, improving the emission efficiency and directivity of the ultrasonic waves.

[0037] In some embodiments, the second light-transmissive electrode layer 32 can be in direct contact with the rigid light-transmissive cover plate 2, and the two define the plurality of cavities 5. In other embodiments, a rigid functional layer can be additionally arranged between the second light-transmissive electrode layer 32 and the rigid light-transmissive cover plate 2, the second light-transmissive electrode layer 32 is in contact with the rigid functional layer, and the two define the plurality of cavities 5.

[0038] In some embodiments, the material of the lens array layer 4 is the same as the material of the piezoelectric material layer 33. In this way, the lens array layer 4 and the piezoelectric material layer 33 can be made of the same material, reducing the required types of materials and simplifying the manufacturing process of the display device 100. For example, the lens array layer 4 and the piezoelectric material layer 33 can both include titanium dioxide.

[0039] It should be noted that when the material of the lens array layer 4 is the same as the material of the piezoelectric material layer 33, the material of the lens array layer 4 has a high refractive index and light transmittance, and also has a periodic and extremely small deformation under the action of an electric field.

[0040] In some embodiments, referring to Figure 1 and Figure 2 , the lens array layer 4 and the piezoelectric material layer 33 are an integral structure. In this way, the lens array layer 4 and the piezoelectric material layer 33 can be formed at the same time, simplifying the manufacturing process of the display device 100.

[0041] In some embodiments, the material of the lens array layer 4 is different from the material of the piezoelectric material layer 33. In this way, appropriate materials can be matched according to the functional requirements of the lens array layer 4 and the piezoelectric material layer 33, respectively, reducing the difficulty of selecting materials.

[0042] In some embodiments, referring to Figure 3 , the lens array layer 4 and the piezoelectric material layer 33 belong to two different layers.

[0043] In some embodiments, referring to 1 and Figure 3 , the light-transmitting piezoelectric functional layer 3 is in contact with the display panel 1. In this way, the light-transmitting piezoelectric functional layer 3 can be directly formed on the display panel 1, which is conducive to omitting the substrate supporting the light-transmitting piezoelectric functional layer 3 and ensuring the overall thickness of the display device 100.

[0044] In some embodiments, referring to 2, the display device 100 further includes a light-transmitting substrate 7, and the light-transmitting substrate 7 is located between the light-transmitting piezoelectric functional layer 3 and the display panel 1. In this way, the light-transmitting piezoelectric functional layer 3 can be first formed on the light-transmitting substrate 7 and then attached to the display panel 1, simplifying the manufacturing process of the light-transmitting piezoelectric functional layer 3. In some embodiments, the light-transmitting substrate 7 can include any one of a rigid substrate and a flexible substrate.

[0045] In some embodiments, referring to Figure 4 , the lens array layer 4 is located between the second light-transmitting electrode layer 32 and the rigid light-transmitting cover plate 2. The plurality of cavities 5 are located between the lens array layer 4 and the rigid light-transmitting cover plate 2. In this way, the light-transmitting piezoelectric functional layer 3 and the lens array layer 4 can be formed independently of each other. Moreover, the light-transmitting piezoelectric functional layer 3 is parallel to the display panel 1, reducing the difficulty of forming the light-transmitting piezoelectric functional layer 3.

[0046] In some embodiments, referring to Figure 4 , the plurality of lenses 41 are in direct contact with the rigid light-transmitting cover plate 2, and define a plurality of cavities 5.

[0047] In some embodiments, referring to Figure 4 , the lens array layer 4 can further include a light-transmitting substrate 43, and the plurality of lenses 41 are located on the light-transmitting substrate 43. In this way, the light-transmitting substrate 43 plays a supporting and fixing role for the plurality of lenses 41, and reduces the risk of movement of the plurality of lenses 41. In some embodiments, the light-transmitting substrate 43 can be in an integrated structure with the plurality of lenses 41. In other embodiments, the plurality of lenses 41 can be separated from the light-transmitting substrate 43.

[0048] In some embodiments, referring to Figure 5 , the lens array layer 4 is located between the display panel 1 and the first light-transmitting electrode layer 31, and the plurality of cavities 5 are located between the lens array layer 4 and the light-transmitting piezoelectric functional layer 3. In this way, the distance between the lens array layer 4 and the display panel 1 is closer, and the display effect of the display device 1003D is improved.

[0049] In summary, in the display device of the embodiments of the present application, the light emitted by the display panel is processed by the plurality of lens curved surfaces of the lens array layer, and three-dimensional (3D) display can be achieved. In addition, the plurality of cavities are located between the plurality of lenses and the rigid light-transmitting cover plate or the light-transmitting piezoelectric functional layer, and the vibration generated by the piezoelectric material layer under the action of the electric field is transmitted to the plurality of cavities through the lens array layer, and then the air inside the plurality of cavities is pushed to generate ultrasonic waves. Therefore, the lens array layer is not only used for processing the light emitted by the display panel to achieve 3D display, but also used for forming a plurality of cavities to generate ultrasonic waves, that is, through the multiplexing of the lens array layer, the display device has the functions of 3D display and ultrasonic wave generation, and thus the display device has a plurality of different functions, and at the same time, the structure of the display device is simplified.

[0050] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0051] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0052] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0053] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, include: Display panel; A rigid light-transmitting cover is located on the light-emitting side of the display panel; A light-transmitting piezoelectric functional layer is located between the rigid light-transmitting cover plate and the display panel, and includes a first light-transmitting electrode layer, a second light-transmitting electrode layer, and a piezoelectric material layer; the first light-transmitting electrode layer is disposed close to the display panel, the second light-transmitting electrode layer is disposed close to the rigid light-transmitting cover plate, and the piezoelectric material layer is located between the first light-transmitting electrode layer and the second light-transmitting electrode layer. A lens array layer is located between the rigid light-transmitting cover and the display panel, and includes multiple lenses; one of the lenses includes a lens arc surface that protrudes toward the rigid light-transmitting cover. Multiple cavities are located between the multiple lenses and the rigid light-transmitting cover plate or the light-transmitting piezoelectric functional layer.

2. The display device according to claim 1, characterized in that, The lens array layer is located between the piezoelectric material layer and the second light-transmitting electrode layer. The second light-transmitting electrode layer covers the lens arc surfaces of the plurality of lenses, and the plurality of cavities are located between the second light-transmitting electrode layer and the rigid light-transmitting cover plate.

3. The display device according to claim 2, characterized in that, The material of the lens array layer is the same as that of the piezoelectric material layer.

4. The display device according to claim 3, characterized in that, The lens array layer and the piezoelectric material layer are an integral structure.

5. The display device according to claim 2, characterized in that, The material of the lens array layer is different from the material of the piezoelectric material layer.

6. The display device according to claim 1, characterized in that, The lens array layer is located between the second light-transmitting electrode layer and the rigid light-transmitting cover plate, and the plurality of cavities are located between the lens array layer and the rigid light-transmitting cover plate.

7. The display device according to claim 1, characterized in that, The lens array layer is located between the display panel and the first light-transmitting electrode layer, and the plurality of cavities are located between the lens array layer and the light-transmitting piezoelectric functional layer.

8. The display device according to any one of claims 1 to 7, characterized in that, The display device further includes a light-transmitting substrate, which is located between the light-transmitting piezoelectric functional layer and the display panel.

9. The display device according to any one of claims 1 to 6, characterized in that, The light-transmitting piezoelectric functional layer is in contact with the display panel.

10. The display device according to claim 1, characterized in that, At least one of the first and second light-transmitting electrode layers includes a plurality of electrodes spaced apart, and one of the electrodes overlaps with at least two of the lenses.

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