Display panel and display apparatus

Abstract

Provided in the embodiments of the present disclosure are a display panel and a display apparatus. The display panel comprises a base substrate, which is provided with a first surface and a second surface arranged opposite each other. The display panel further comprises a plurality of light-emitting units which are arranged on the first surface of the base substrate, and a plurality of sound production units which are arranged on the first surface of the base substrate and are arranged between adjacent light-emitting units, wherein each sound production unit comprises: a piezoelectric device, which is arranged on the first surface of the base substrate; a sound gathering structure, which is arranged on the first surface of the base substrate and surrounds the piezoelectric device; and a back cavity, which is arranged on the second surface of the base substrate, is recessed towards one side of the first surface, and is arranged corresponding to the piezoelectric device.

Description

Display panel and display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on July 27, 2023, with application number 202310936983.9 and invention name "A display panel and display device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0004] With the continuous development of display technology, the application scope of display devices is becoming increasingly broad, and people's requirements for the integration of various functions in display devices are also increasing. Among them, screen sound has become the mainstream. The principle of screen sound technology is that an exciter drives the screen and structure in front of it, using the screen as a vibrator, and the vibration generates sound waves that are transmitted to the human ear. However, existing screen sound technology generally suffers from problems such as insufficient sound directionality and poor sound quality.

[0005] Summary of the Invention

[0006] The present disclosure provides a display panel and a display device, and the specific solutions are as follows:

[0007] An embodiment of the present disclosure provides a display panel, comprising a base substrate having a first surface and a second surface opposite to each other; the display panel further comprising: a plurality of light-emitting units disposed on the first surface of the base substrate, and a plurality of sound-emitting units disposed on the first surface of the base substrate and between adjacent light-emitting units; wherein:

[0008] The sound-emitting unit comprises:

[0009] A piezoelectric device is disposed on the first surface of the substrate;

[0010] a sound-focusing structure, disposed on the first surface of the base substrate and surrounding the piezoelectric device;

[0011] A back cavity is provided on the second surface of the base substrate and is recessed toward one side of the first surface, and the back cavity is provided corresponding to the piezoelectric device.

[0012] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the depth of the back cavity is less than the thickness of the base substrate and greater than 80% of the thickness of the base substrate.

[0013] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the sizes of the back cavities corresponding to the sound-emitting units are the same, or the sizes of the back cavities corresponding to different sound-emitting units are not completely the same.

[0014] In a possible implementation, in the above-mentioned display panel provided in an embodiment of the present disclosure, the base substrate is divided into a first supporting portion corresponding to the back cavity and a second supporting portion arranged around the first supporting portion, the first supporting portion and the second supporting portion are connected by at least two connecting portions arranged at intervals, and a through hole penetrating the base substrate is provided between two adjacent connecting portions, and the first supporting portion, the second supporting portion and the connecting portion are an integrated structure.

[0015] In a possible implementation, in the display panel provided by an embodiment of the present disclosure, the shape of the second supporting portion is complementary to the shape of the first supporting portion, and the shape of the first supporting portion includes circular, square, or polygonal.

[0016] In a possible implementation, in the above-mentioned display panel provided in an embodiment of the present disclosure, the piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode stacked sequentially on a side of the first supporting portion away from the back cavity, and the ratio of the thickness of the first supporting portion to the thickness of the piezoelectric layer is 1 to 10.

[0017] In a possible implementation, in the display panel provided in an embodiment of the present disclosure, a pore is provided inside the sound-emitting unit and passes through the piezoelectric device and the first supporting portion, and the size of the pore is 0 to 9 μm.

[0018] In a possible implementation, in the above-mentioned display panel provided in an embodiment of the present disclosure, an angle between a tangent line of an inner wall of the sound-focusing structure and the base substrate is greater than 0° and less than or equal to 90°.

[0019] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the cross-sectional shape of the inner wall of the sound-focusing structure along the thickness direction of the base substrate includes a straight line, a parabola, a broken line or a sawtooth shape.

[0020] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the thickness of the sound-focusing structure is 10 μm to 100 μm, and the width of the sound-focusing structure is 30 μm to 100 μm.

[0021] In a possible implementation, in the above-mentioned display panel provided in an embodiment of the present disclosure, there is a gap between the sound focusing structure and the piezoelectric device, and the width of the gap is greater than or equal to 0 and less than or equal to half the width of the piezoelectric device.

[0022] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the plurality of light-emitting units are arrayed on one side of the base substrate, and a column of sound-emitting units is provided between at least two adjacent columns of the light-emitting units.

[0023] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, a column of the sound-emitting units is correspondingly provided between every two adjacent columns of the light-emitting units.

[0024] In a possible implementation, in the above-mentioned display panel provided in an embodiment of the present disclosure, the plurality of light-emitting units include multiple rows and columns of the light-emitting units, and the light-emitting units in one column of at least two adjacent columns are arranged at odd-numbered row positions, and the light-emitting units in the other column are arranged at even-numbered row positions, and the sound-emitting units are arranged at intervals at the even-numbered row positions of one column of the light-emitting units, and / or the sound-emitting units are arranged at intervals at the odd-numbered row positions of the other column of the light-emitting units.

[0025] In one possible implementation, in the above-mentioned display panel provided by an embodiment of the present disclosure, the first electrode of each of the piezoelectric devices in the sound-emitting units in the same column is electrically connected to the first driving voltage end through a first lead, and the second electrode of each of the piezoelectric devices in the sound-emitting units in the same column is electrically connected to the second driving voltage end through a second lead.

[0026] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the sizes of the piezoelectric layers in the piezoelectric devices are the same, or the sizes of the piezoelectric layers in the piezoelectric devices are not completely the same.

[0027] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, each of the light-emitting units includes at least one light-emitting element, and the light-emitting element includes a light-emitting diode chip or an organic light-emitting diode.

[0028] In a possible implementation, the display panel provided in the embodiment of the present disclosure further includes a driving circuit located between the base substrate and the light-emitting unit, and the light-emitting unit and the sound-emitting unit share the driving circuit.

[0029] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, the thickness of the piezoelectric layer in the piezoelectric device is 1 μm to 10 μm.

[0030] In one possible implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, the material of the piezoelectric layer in the piezoelectric device includes at least one of lead zirconate titanate, aluminum nitride, zinc oxide, barium titanate, lead titanate, potassium niobate, lithium niobate, lithium tantalate, and lanthanum gallium silicate.

[0031] Correspondingly, an embodiment of the present disclosure further provides a display device, comprising the above-mentioned display panel provided by an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a planar structure of a display panel provided by an embodiment of the present disclosure;

[0033] FIG2 is a schematic cross-sectional view along the AA′ direction in FIG1 ;

[0034] Figures 3A-3C are schematic diagrams of back cavities of different sizes;

[0035] FIG4 is a schematic diagram of a partial planar structure of the base substrate 1 in FIG2 ;

[0036] FIG5A is a schematic diagram showing the relationship between the thickness ratio of the first support portion and the piezoelectric layer and the sound pressure level (SPL);

[0037] FIG5B is a schematic diagram showing the relationship between the thickness ratio of the first support portion and the piezoelectric layer and sensitivity;

[0038] 6A-6C are schematic diagrams showing that a hole penetrating the piezoelectric device and the first supporting portion is provided inside the sound-emitting unit corresponding to back cavities of different sizes;

[0039] FIG7 is a schematic cross-sectional view of a sound focusing structure;

[0040] FIG8A is another cross-sectional schematic diagram of a sound focusing structure;

[0041] FIG8B is another cross-sectional schematic diagram of the sound focusing structure;

[0042] FIG8C is another cross-sectional schematic diagram of the sound focusing structure;

[0043] FIG9A shows an arrangement of sound generating units;

[0044] FIG9B shows another arrangement of the sound generating units;

[0045] FIG10A shows another arrangement of the sound generating units;

[0046] FIG10B shows another arrangement of the sound generating units;

[0047] FIG11 is a schematic diagram showing the calculation principle of the neutral axis of the piezoelectric layer (diaphragm) of the sound unit (speaker);

[0048] 12A-12D are schematic diagrams of the integration of diaphragm units of different sizes;

[0049] FIG13A is a time domain signal;

[0050] FIG13B is a frequency domain signal of FFT (Fast Fourier Transform). DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0052] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words “include” or “comprise” and the like used in this disclosure mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words “connect” or “connected” and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Inside”, “outside”, “upper”, “lower”, etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0053] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0054] An embodiment of the present disclosure provides a display panel, as shown in FIG1 and FIG2 , FIG1 is a planar schematic diagram of the display panel, and FIG2 is a cross-sectional schematic diagram along the AA' direction in FIG1 , wherein the display panel includes a base substrate 1, the base substrate 1 having a first surface 101 and a second surface 102 arranged opposite to each other; the display panel further includes: a plurality of light-emitting units 2 arranged on the first surface 101 of the base substrate 1, and a plurality of sound-emitting units 3 arranged on the first surface 101 of the base substrate 1 and between adjacent light-emitting units 2; wherein,

[0055] The sound unit 3 includes:

[0056] The piezoelectric device 31 is provided on the first surface 101 of the base substrate 1;

[0057] The sound focusing structure 32 is disposed on the first surface 101 of the base substrate 1 and surrounds the piezoelectric device 31 ;

[0058] The back cavity 33 is disposed on the second surface 102 of the base substrate 1 and is recessed toward the first surface 101 . The back cavity 33 is disposed corresponding to the piezoelectric device 31 .

[0059] The above-mentioned display panel provided by the embodiment of the present disclosure has a relatively simple integration process of the display panel integrating the screen sound function by arranging multiple sound-emitting units between adjacent light-emitting units; and, the inverse piezoelectric effect of the piezoelectric device generates deformation vibration to drive the air in the back cavity to vibrate and emit sound waves, thereby realizing screen sound, and the sound-gathering structure can have a sound-gathering effect on the emitted sound, thereby improving the problems of poor timbre and insufficient sound directionality of traditional screen sound.

[0060] Specifically, the reflection unit in the embodiment of the present disclosure is equivalent to a speaker, that is, the speaker is integrated into the display panel to realize screen sound.

[0061] Specifically, the base substrate may be a glass substrate, but is not limited thereto. Optionally, the glass substrate may be made of high-temperature glass, and the thickness of the glass substrate may be 500 μm to 1000 μm.

[0062] In a specific implementation, in the above-mentioned display panel provided by the embodiment of the present disclosure, as shown in FIG2 , the depth of the back cavity 33 is less than the thickness of the substrate 1 and greater than 80% of the thickness of the substrate 1. Specifically, the substrate 1 can be divided into a first support portion 11 corresponding to the back cavity 33. The first support portion 11 is formed after the back cavity 33 is originally formed on the substrate 1, that is, the thickness of the first support portion 11 is less than 20% of the thickness of the substrate 1. In this way, when the piezoelectric device 31 generates deformation vibration under the inverse piezoelectric effect, it can drive the first support portion 11 to vibrate, thereby driving the air in the back cavity 33 to vibrate and emit sound waves. However, if the depth of the back cavity 33 is less than 80% of the thickness of the substrate 1, the thickness of the first support portion 11 layer is greater than 20% of the thickness of the substrate 1, which makes the thickness of the first support portion 11 too thick, resulting in a poor vibration effect, which is not conducive to the sound of the screen.

[0063] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in Figures 1 and 2 , the size of the back cavity 33 corresponding to each sound unit 3 can be the same. This can unify the manufacturing process of the back cavity 33 and reduce process complexity. Of course, the sizes of the back cavities 33 corresponding to the different sound units 3 shown in Figure 1 can also be different. For example, the size of the back cavity 33 corresponding to some sound units 3 is larger, as shown in Figure 3A , for example, the size of the back cavity 33 is larger than the size of the piezoelectric device 31; the size of the back cavity 33 corresponding to some sound units 3 is intermediate, as shown in Figure 3B , for example, the size of the back cavity 33 is approximately equal to the size of the piezoelectric device 31; and the size of the back cavity 33 corresponding to some sound units 3 is smaller, as shown in Figure 3C , for example, the size of the back cavity 33 is smaller than the size of the piezoelectric device 31. Specifically, the size (e.g., volume) of the back cavity 33 can be adjusted as much as possible according to the installation location. It can be manufactured using glass through-hole technology or laser-induced etching. Increasing the volume of the back cavity 33 can enhance the low-frequency effect, while reducing the volume of the back cavity 33 can enhance the high-frequency effect, resulting in a richer sound. Therefore, those skilled in the art may design the size of the back cavity 33 according to actual needs, and this disclosure does not limit this.

[0064] In a specific implementation, in the above-mentioned display panel provided by the embodiment of the present disclosure, as shown in Figures 2 and 4, Figure 4 is a schematic diagram of the partial planar structure of the base substrate 1 in Figure 2. The base substrate 1 can be divided into a first support portion 11 corresponding to the back cavity 33 and a second support portion 12 arranged around the first support portion 11. The first support portion 11 and the second support portion 12 are connected by at least two connecting portions 13 arranged at intervals. There is a through hole V penetrating the base substrate 1 between two adjacent connecting portions 13. The first support portion 11, the second support portion 12 and the connecting portion 13 are an integral structure. Specifically, the first support portion 11 mainly plays the role of supporting the piezoelectric device 31, and by setting the connection between the first support portion 11 and the peripheral second support portion 12 as a partial connection using the connecting portion 13, it is beneficial to increase the amplitude of the piezoelectric device 31 when it vibrates, thereby improving the sound pressure level and sensitivity of the speaker.

[0065] Optionally, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figures 2 and 4, the shape of the second support portion 12 is complementary to the shape of the first support portion 11. For example, the shape of the first support portion 11 is circular, the shape of the first support portion 11 is circular, the inner annular surface of the second support portion 12 is also circular, and the diameter of the first support portion 11 can be 50μm to 500μm; of course, the shape of the first support portion 11 can also be square, then the inner annular surface of the second support portion 12 is also square; the shape of the first support portion 11 can also be polygonal, then the inner annular surface of the second support portion 12 is also polygonal; and so on.

[0066] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figure 2, the piezoelectric device 31 includes a first electrode 311, a piezoelectric layer 312, and a second electrode 313 stacked in sequence on the side of the first support part 11 away from the back cavity 33. The different thickness ratios of the first support part 11 and the piezoelectric layer 312 will affect the sound pressure level (SPL) and sensitivity (Sensitivity) of the speaker, as shown in Figures 5A and 5B. Figure 5A is a schematic diagram of the relationship between the thickness ratio D of the first support part 11 and the piezoelectric layer 312 and the sound pressure level (SPL), and Figure 5B is a schematic diagram of the relationship between the thickness ratio D of the first support part 11 and the piezoelectric layer 312 and the sensitivity (Sensitivity). It can be seen that when the ratio of the thickness of the first support part 11 to the thickness of the piezoelectric layer 312 is between 1 and 10, the sound effect of the sound unit 3 is better. Therefore, in the embodiment of the present disclosure, the ratio of the thickness of the first support part 11 to the thickness of the piezoelectric layer 312 is set to 1 to 10.

[0067] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figure 2, the first electrode 311 is generally grounded, and the second electrode 313 is generally connected to the driving voltage end. By loading the ground voltage to the first electrode 311 and loading the high-frequency AC voltage to the second electrode 313, an alternating electric field is formed between the first electrode 311 and the second electrode 313. The piezoelectric layer 312 vibrates under the action of the alternating electric field and drives the first support part 11 to vibrate, thereby driving the air in the back cavity 33 to vibrate and emit sound waves.

[0068] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in FIG2 , the thickness of the piezoelectric layer 312 may be 1 μm to 10 μm. For example, the thickness of the piezoelectric layer 312 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm.

[0069] In a specific implementation, the material of the piezoelectric layer can be lead zirconate titanate (Pb(Zr,Ti)O3, PZT), or aluminum nitride (AlN), ZnO (zinc oxide), barium titanate (BaTiO3), lead titanate (PbTiO3), potassium niobate (KNbO3), lithium niobate (LiNbO3), lithium tantalate (LiTaO3), lanthanum gallium silicate (La3Ga5SiO 14 ), and the material for the piezoelectric layer can be selected based on the actual needs of those skilled in the art, and is not limited here. Specifically, when PZT is used to form the piezoelectric layer, due to its high piezoelectric coefficient, the piezoelectric characteristics of the corresponding piezoelectric sensor are guaranteed, and the corresponding piezoelectric sensor can be applied to tactile feedback devices. Furthermore, PZT has high light transmittance, and when integrated into a display device, it does not affect the display quality of the display device.

[0070] Optionally, the piezoelectric layer may be prepared by sputtering or sol-gel method, but is not limited thereto.

[0071] In the specific implementation process, the first electrode and the second electrode can be made of indium tin oxide (ITO), or can be made of indium zinc oxide (IZO). Of course, they can also be made of one of titanium-gold (Ti-Au) alloy, titanium-aluminum-titanium (Ti-Al-Ti) alloy, and titanium-molybdenum (Ti-Mo) alloy. In addition, they can also be made of one of platinum (Pt), titanium (Ti), gold (Au), silver (Ag), molybdenum (Mo), copper (Cu), tungsten (W), and chromium (Cr). Those skilled in the art can set the above-mentioned electrodes according to actual application needs, and there is no limitation here.

[0072] Optionally, the first electrode and the second electrode may be prepared by sputtering or electron evaporation, but is not limited thereto.

[0073] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in Figures 6A-6C (Figure 6A is a schematic diagram of a modification of Figure 3A, Figure 6B is a schematic diagram of a modification of Figure 3B, and Figure 6C is a schematic diagram of a modification of Figure 3C), a pore H is provided within the sound-emitting unit 3, penetrating the piezoelectric device 31 and the first support portion 11. The size of the pore H can be 0 to 9 μm, and the provision of the pore H can enhance low-frequency response. Optionally, the orthographic projection of the pore H on the base substrate 1 can be a circle with a diameter of 0 to 9 μm.

[0074] In specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figure 7, the angle θ between the tangent L of the inner wall of the sound focusing structure 32 and the base substrate 1 is greater than 0° and less than or equal to 90°, so as to improve the sound focusing effect of the sound focusing structure 32.

[0075] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in FIG7 , the cross-sectional shape of the inner wall of the sound-focusing structure 32 along the thickness direction of the substrate 1 is a straight line, but of course it is not limited to this; for example, as shown in FIG8A , the cross-sectional shape of the inner wall of the sound-focusing structure 32 along the thickness direction of the substrate 1 can be a parabola; as shown in FIG8B , the cross-sectional shape of the inner wall of the sound-focusing structure 32 along the thickness direction of the substrate 1 can be a broken line; as shown in FIG8C , the cross-sectional shape of the inner wall of the sound-focusing structure 32 along the thickness direction of the substrate 1 can be a serrated shape; of course it is not limited to this.

[0076] In specific implementation, in order to enhance the sound focusing effect of the sound focusing structure, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figures 2 and 7, the thickness d of the sound focusing structure 32 can be 10μm~100μm, and the width w1 of the sound focusing structure 32 can be 30μm~100μm.

[0077] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figures 2 and 7, there is a gap between the sound focusing structure 32 and the piezoelectric device 31, and the width w2 of the gap is greater than or equal to 0 and less than or equal to half of the width w3 of the piezoelectric device 31.

[0078] Optionally, the sound-gathering structure may be made of photoresist or sound-absorbing material. For example, the sound-gathering structure may be formed by photolithography when the piezoelectric device is prepared.

[0079] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in Figures 9A and 9B , a plurality of light-emitting units 2 are arrayed on one side of a base substrate 1, and a column of sound-emitting units 3 is provided between at least two adjacent columns of light-emitting units 2. Specifically, as shown in Figure 9A , of the two adjacent columns of light-emitting units 2, only one column of light-emitting units 2 is provided with a column of sound-emitting units 3 on one side. The structure shown in Figure 9A is a single-column display and a single-column display with simultaneous sound. As shown in Figures 1 and 9B , a column of sound-emitting units 3 is provided between each two adjacent columns of light-emitting units 2. Figures 1 and 9B are a full display and sound integration.

[0080] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in FIG10A and FIG10B , the plurality of light-emitting units 2 include multiple rows and columns of light-emitting units 2 (only some rows and some columns are shown in the present disclosure), and at least one of the two adjacent columns of light-emitting units 2 is arranged at odd-numbered rows, and the other column of light-emitting units 2 is arranged at even-numbered rows, and the sound-emitting units 3 are alternately arranged at even-numbered rows of one column of light-emitting units 2, and / or the sound-emitting units 3 are alternately arranged at odd-numbered rows of the other column of light-emitting units 2. Thus, the arrangement of the sound-emitting units 3 in FIG10A and FIG10B resembles a checkerboard arrangement.

[0081] In specific implementation, when driving the above-mentioned sound units provided in the embodiment of the present disclosure, there are various specific driving modes, including block driving and full driving. For example, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figures 9A, 9B and 10A, the first electrode 311 of each piezoelectric device 31 in the same column of sound units 3 is electrically connected to the first driving voltage terminal (ground terminal GND) through the first lead, and the second electrode 313 of each piezoelectric device 31 in the same column of sound units 3 is electrically connected to the second driving voltage terminal (AC voltage terminal V AC ) is electrically connected. In this way, FIG9A, FIG9B and FIG10A can adopt column drive (region drive), that is, drive the sound unit 3 in different regions, thereby realizing the pronunciation of different regions on the screen.

[0082] As shown in FIG10B , the first electrode 311 of each piezoelectric device 31 in all sounding units 3 is electrically connected to the first driving voltage terminal (ground terminal GND) through the first lead, and the second electrode 313 of each piezoelectric device 31 in all sounding units 3 is electrically connected to the second driving voltage terminal (AC voltage terminal V AC ) is electrically connected. Thus, FIG10B adopts all driving, thereby realizing the whole screen sound.

[0083] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in FIG2 , the calculation principle of the neutral axis of the piezoelectric layer 312 (diaphragm) of the sound-emitting unit 3 (speaker) is shown in FIG11 , and the natural frequency resonance characteristic of the speaker diaphragm is expressed by the following formula (1):

[0084] Where f0 is the natural frequency of the substrate, a is the radius of the diaphragm, D is the equivalent bending stiffness, and ρ is the average area density.

[0085] Among them, Ei, vi, hi and ρi are Young's modulus, Poisson's ratio, thickness and volume density of the i-th layer (first support part), respectively. di is the distance from the neutral axis to the mid plane (Mid plane) of the i-th layer (first support part 11). It can be seen that adjusting the diaphragm radius can change the resonance frequency and frequency response characteristics of the speaker diaphragm. Therefore, the sound unit 3 in the present disclosure can be set to integrate diaphragm units of different sizes as shown in Figures 12A to 12D to achieve complex frequency driving. In Figures 12A to 12D, r1, r2 and r3 represent diaphragms of different radii, r1<r2<r3, and all of them can be substituted into the above formula to achieve different frequency response characteristics, as shown in Figures 13A and 13B. Figure 13A is a time domain signal, and Figure 13B is a frequency domain signal of FFT (Fast Fourier Transform).

[0086] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in FIG1 , FIG9A , FIG9B and FIG10A , the size (for example, the radius is r3 ) of the piezoelectric layer 312 (diaphragm) in each piezoelectric device 31 may be the same.

[0087] In a specific implementation, controlling the specific layout of multiple sound-emitting units in the array-distributed light-emitting units, as well as the driving method of the sound-emitting units, can achieve better quality and more diverse sound effects, thereby effectively solving the problem that the pronunciation method and quality are limited in the existing display pronunciation integration technology. For example, in the above-mentioned display panel provided in the embodiment of the present disclosure, as shown in Figures 12A-12D, the size of the piezoelectric layer 312 (shock film) in each piezoelectric device 31 is not exactly the same. Optionally, as shown in Figure 12A, in two adjacent columns of light-emitting units 2, the radius of the piezoelectric layer 312 (shock film) in a column of sound-emitting units 3 on one side of one column of light-emitting units 2 can be the same, for example, both are r1; the radius of the piezoelectric layer 312 (shock film) in a column of sound-emitting units 3 on the other side of the light-emitting units 2 can be the same, for example, both are r3. Optionally, as shown in FIG12B , in two adjacent columns of light-emitting units 2, the radii of the piezoelectric layer 312 (diaphragm) in a column of sound-emitting units 3 on one side of one column of light-emitting units 2 may be different, for example, arranged in a repeating unit of r1, r2, and r3; the radii of the piezoelectric layer 312 (diaphragm) in a column of sound-emitting units 3 on the other side of the light-emitting units 2 may be the same, for example, both are r1. Optionally, as shown in FIG12C , in two adjacent columns of light-emitting units 2, the radii of the piezoelectric layer 312 (diaphragm) in a column of sound-emitting units 3 on the one side of one column of light-emitting units 2 may be different, for example, arranged in a repeating unit of r1, r2, and r3; the radii of the piezoelectric layer 312 (diaphragm) in a column of sound-emitting units 3 on the other side of the light-emitting units 2 may be the same, for example, both are r3. Optionally, as shown in FIG12D , the radii of the piezoelectric layer 312 (diaphragm) in a column of sound-emitting units 3 on each side of each column of light-emitting units 2 may be arranged in a repeating unit of r1, r2, and r3. Of course, the arrangement of the piezoelectric devices 31 with piezoelectric layers 312 (diaphragms) of different sizes is not limited to the above-mentioned arrangements listed in the present disclosure and can be designed according to needs.

[0088] In a specific implementation, the display panel provided in the embodiment of the present disclosure, as shown in FIG2 , further includes a driving circuit 4 located between the base substrate 1 and the light-emitting unit 2. The light-emitting unit 2 and the sound-emitting unit 3 can share the driving circuit 4, that is, the driving circuit 4 controls both the display and the sound. Specifically, the driving circuit 4 is a TFT array layer, and the TFT can be produced using an LTPS process. Before the light-emitting unit 2 and the sound-emitting unit 3 are produced on the base substrate 1, the driving circuit 4 is produced on the base substrate 1. The driving circuit 4 is used to drive the corresponding light-emitting unit 2 to emit light and the corresponding sound-emitting unit 3 to produce sound.

[0089] In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in Figures 1, 9A, 9B, 10A, 10B, and 12A-12D, each light-emitting unit 2 includes at least one light-emitting element (taking three as an example, 21, 22, and 23). Optionally, the light-emitting elements (21, 22, and 23) include light-emitting diode (LED) chips, and an LED chip array can be formed on the driving circuit 4 by transfer printing. There is a gap between adjacent LED chips, and the sound-emitting unit 3 is formed in the gap.

[0090] Specifically, as shown in Figure 2, after the driver circuit 4 is fabricated, a bump pad can be used to electrically connect to the LED chip. The bump pad is formed using Au-Sn or Au-In bonding. The LED can be a conventional micro-LED flip-chip structure, and a material such as SiNx can be used as the insulating passivation layer 5.

[0091] Optionally, the light-emitting elements (21, 22, and 23) may include organic light-emitting diodes (OLEDs), which may be fabricated directly on the drive circuit 4. After the drive circuit 4 is fabricated, a plurality of light-emitting elements (21, 22, and 23) are arrayed and distributed on the drive circuit 4. There is a gap of a certain width between adjacent light-emitting elements (21, 22, and 23), and the sound-emitting unit 3 is formed in the gap.

[0092] Optionally, the light emitting color of the light emitting element 21 is red, the light emitting color of the light emitting element 22 is green, and the light emitting color of the light emitting element 23 is blue.

[0093] Based on the same inventive concept, embodiments of the present disclosure further provide a display device comprising the aforementioned display panel. Because the principles underlying the display device are similar to those of the aforementioned display panel, the implementation of the display device can be referenced to the aforementioned display panel implementation, and any repetitive details will not be repeated. The display device can be any product or component with display or touch functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system.

[0094] In specific implementation, the display device provided by the embodiment of the present disclosure may further include other film layers well known to those skilled in the art, which will not be described in detail here.

[0095] The embodiments of the present disclosure provide a display panel and a display device. The display panel provided by the embodiments of the present disclosure makes the integration process of the screen sound function of the display panel simpler by arranging multiple sound-emitting units between adjacent light-emitting units. Moreover, deformation vibration is generated through the inverse piezoelectric effect of the piezoelectric device to drive the air in the back cavity to vibrate and emit sound waves, thereby realizing screen sound. Moreover, the sound-gathering structure can have a sound-gathering effect on the emitted sound, thereby improving the problems of poor timbre and insufficient sound directionality of traditional screen sound.

[0096] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0097] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if such changes and modifications of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such changes and modifications.

Claims

1. A display panel, wherein: The invention comprises a substrate substrate having a first surface and a second surface arranged opposite to each other; The display panel further includes: a plurality of light emitting units disposed on the first surface of the base substrate, and a plurality of sound emitting units disposed on the first surface of the base substrate and between adjacent light emitting units; wherein The sound generating unit comprises: A piezoelectric device is disposed on the first surface of the substrate; A sound focusing structure is arranged on the first surface of the substrate and surrounds the piezoelectric device; A back cavity is arranged on the second surface of the base substrate and is recessed toward one side of the first surface, and the back cavity is arranged corresponding to the piezoelectric device.

2. The display panel according to claim 1, wherein: The depth of the back cavity is less than the thickness of the base substrate and greater than 80% of the thickness of the base substrate.

3. The display panel according to claim 2, wherein: The sizes of the back cavities corresponding to the sound-emitting units are the same, or the sizes of the back cavities corresponding to different sound-emitting units are not completely the same.

4. The display panel according to any one of claims 1 to 3, wherein: The base substrate is divided into a first supporting portion corresponding to the back cavity and a second supporting portion arranged around the first supporting portion, the first supporting portion and the second supporting portion are connected by at least two connecting portions arranged at intervals, and a through hole penetrating the base substrate is provided between two adjacent connecting portions, and the first supporting portion, the second supporting portion and the connecting portion are an integrated structure.

5. The display panel according to claim 4, wherein: The shape of the second supporting portion is complementary to that of the first supporting portion, and the shape of the first supporting portion includes a circle, a square or a polygon.

6. The display panel according to claim 4, wherein: The piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode which are sequentially stacked on a side of the first support portion away from the back cavity. The ratio of the thickness of the first support portion to the thickness of the piezoelectric layer is 1-10.

7. The display panel according to any one of claims 4 to 6, wherein: A pore penetrating the piezoelectric device and the first supporting portion is disposed inside the sound generating unit, and a size of the pore is 0 to 9 μm.

8. The display panel according to any one of claims 1 to 7, wherein: The angle between the tangent line of the inner wall of the sound focusing structure and the base substrate is greater than 0° and less than or equal to 90°.

9. The display panel according to claim 8, wherein: The cross-sectional shape of the inner wall of the sound focusing structure along the thickness direction of the base substrate includes a straight line, a parabola, a broken line or a sawtooth shape.

10. The display panel according to any one of claims 1 to 9, wherein: The thickness of the sound focusing structure is 10 μm to 100 μm, and the width of the sound focusing structure is 30 μm to 100 μm.

11. The display panel according to any one of claims 1 to 10, wherein: There is a gap between the sound focusing structure and the piezoelectric device, and the width of the gap is greater than or equal to 0 and less than or equal to half of the width of the piezoelectric device.

12. The display panel according to any one of claims 1 to 11, wherein: The plurality of light emitting units are arrayed on one side of the base substrate, and a column of sound emitting units is disposed between at least two adjacent columns of the light emitting units.

13. The display panel according to claim 12, wherein: A column of the sound-emitting units is correspondingly arranged between every two adjacent columns of the light-emitting units.

14. The display panel according to any one of claims 1 to 11, wherein: The multiple light-emitting units include multiple rows and columns of light-emitting units, and the light-emitting units in at least one column of two adjacent columns are arranged at odd-numbered row positions, and the light-emitting units in the other column are arranged at even-numbered row positions, the sound-emitting units are arranged at intervals at the even-numbered row positions of one column of the light-emitting units, and / or the sound-emitting units are arranged at intervals at the odd-numbered row positions of the other column of the light-emitting units.

15. The display panel according to any one of claims 12 to 14, wherein: The first electrodes of the piezoelectric devices in the same column of the sound generating units are electrically connected to the first driving voltage terminal through the first lead wire, and the second electrodes of the piezoelectric devices in the same column of the sound generating units are electrically connected to the second driving voltage terminal through the second lead wire.

16. The display panel according to any one of claims 12 to 15, wherein: The sizes of the piezoelectric layers in each of the piezoelectric devices are the same, or the sizes of the piezoelectric layers in each of the piezoelectric devices are not completely the same.

17. The display panel according to any one of claims 1 to 16, wherein: Each of the light-emitting units includes at least one light-emitting element, and the light-emitting element includes a light-emitting diode chip or an organic light-emitting diode.

18. The display panel according to any one of claims 1 to 17, wherein: It also includes a driving circuit located between the base substrate and the light-emitting unit, and the light-emitting unit and the sound-emitting unit share the driving circuit.

19. The display panel according to any one of claims 1 to 18, wherein: The thickness of the piezoelectric layer in the piezoelectric device is 1 μm to 10 μm.

20. The display panel according to any one of claims 1 to 19, wherein: The material of the piezoelectric layer in the piezoelectric device includes at least one of lead zirconate titanate, aluminum nitride, zinc oxide, barium titanate, lead titanate, potassium niobate, lithium niobate, lithium tantalate, and lanthanum gallium silicate.

21. A display device, wherein: Comprising the display panel as claimed in any one of claims 1 to 20.

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