Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device. The display panel comprises a substrate, and the substrate is provided with a first surface and a second surface which are oppositely arranged; the display panel further comprises a plurality of light-emitting units arranged on the first surface of the substrate and a plurality of sound production units arranged on the first surface of the substrate and arranged between the adjacent light-emitting units. The sound production unit comprises a piezoelectric device which is arranged on the first surface of the substrate base plate; the sound gathering structure is arranged on the first surface of the substrate and surrounds the piezoelectric device; and the back cavity is arranged on the second surface of the substrate and is recessed towards one side of the first surface, and the back cavity and the piezoelectric device are correspondingly arranged.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] With the continuous development of display technology, the application scope of display devices is becoming more and more extensive, and people's requirements for the integration of various functions in display devices are also getting higher and higher. Among them, screen sound has become the mainstream. The principle of screen sound technology is to drive the screen and structure in front through an exciter, use the screen as a vibrator, and generate sound waves through vibration to transmit to the human ear. However, the existing screen sound technology generally has problems such as insufficient sound directionality and poor timbre. Summary of the invention

[0003] The present disclosure provides a display panel and a display device, and the specific scheme is as follows:

[0004] A display panel provided by an embodiment of the present disclosure includes a 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 arranged on the first surface of the substrate, and a plurality of sound-emitting units arranged on the first surface of the substrate and between adjacent light-emitting units; wherein

[0005] The sound generating unit comprises:

[0006] A piezoelectric device is disposed on the first surface of the substrate;

[0007] A sound focusing structure is arranged on the first surface of the substrate and surrounds the piezoelectric device;

[0008] 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.

[0009] In a possible implementation, in the above-mentioned display panel provided by 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.

[0010] 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.

[0011] In a possible implementation, in the above-mentioned display panel provided by 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 integral structure.

[0012] In a possible implementation, in the above-mentioned 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 a circle, a square or a polygon.

[0013] In a possible implementation, in the above-mentioned display panel provided by the 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 support portion away from the back cavity, and the ratio of the thickness of the first support portion to the thickness of the piezoelectric layer is 1 to 10.

[0014] In a possible implementation, in the display panel provided in the embodiment of the present disclosure, a pore penetrating the piezoelectric device and the first supporting portion is disposed inside the sound-emitting unit, and a size of the pore is 0 to 9 μm.

[0015] In a possible implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, 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°.

[0016] In a possible implementation, in the above-mentioned display panel provided by 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.

[0017] In a possible implementation, in the above-mentioned 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.

[0018] In a possible implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, there is a gap between the sound focusing structure and the light-emitting 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 light-emitting device.

[0019] 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 the sound emitting units is provided between at least two adjacent columns of the light emitting units.

[0020] 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 arranged between every two adjacent columns of the light emitting units.

[0021] In a possible implementation, in the above-mentioned display panel provided by the embodiment of the present disclosure, the multiple light-emitting units include multiple rows and columns of the light-emitting units, and the light-emitting units in at least two adjacent columns of the light-emitting units 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 light-emitting units in the other column.

[0022] In a possible implementation, in the above-mentioned display panel provided by the 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 terminal through the 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 terminal through the second lead.

[0023] 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.

[0024] In a possible implementation, in the above-mentioned 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.

[0025] 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.

[0026] 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.

[0027] In a 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.

[0028] 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

[0029] Figure 1A schematic diagram of a planar structure of a display panel provided in an embodiment of the present disclosure;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross section along the AA' direction;

[0031] Figure 3A-3C They are schematic diagrams of back cavities of different sizes;

[0032] Figure 4 for Figure 2 A schematic diagram of a partial planar structure of the middle substrate 1;

[0033] Figure 5A is a schematic diagram of the relationship between the thickness ratio of the first support portion and the piezoelectric layer and the sound pressure level (SPL);

[0034] Figure 5B is a schematic diagram of the relationship between the thickness ratio of the first support portion and the piezoelectric layer and sensitivity;

[0035] Figure 6A-6C Schematic diagrams showing that a hole penetrating the piezoelectric device and the first supporting part is arranged inside the sound-emitting unit corresponding to back cavities of different sizes;

[0036] Figure 7 A cross-sectional schematic diagram of a sound-gathering structure;

[0037] Fig. 8A It is another cross-sectional schematic diagram of the sound-gathering structure;

[0038] Figure 8B It is another cross-sectional schematic diagram of the sound-gathering structure;

[0039] Figure 8C It is another cross-sectional schematic diagram of the sound-gathering structure;

[0040] Fig. 9A It is an arrangement of sound units;

[0041] Fig. 9B It is another arrangement of the sound generating units;

[0042] Fig. 10A It is another arrangement of the sound generating units;

[0043] Fig. 10B It is another arrangement of the sound generating units;

[0044] Fig.11 Schematic diagram of the calculation principle of the neutral axis of the piezoelectric layer (diaphragm) of the sound unit (speaker);

[0045] Figures 12A-12D They are schematic diagrams of the integration of diaphragm units of different sizes;

[0046] Fig.13A is the time domain signal;

[0047] Fig. 13B It is the frequency domain signal of FFT (Fast Fourier Transform). DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution 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 the field without creative work are within the scope of protection of the present disclosure.

[0049] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. "Include" or "comprising" and other similar words used in the present disclosure mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words 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 described object changes, the relative positional relationship may also change accordingly.

[0050] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, and are only intended to illustrate the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0051] The present disclosure provides a display panel. Figure 1 and Figure 2 As shown, Figure 1 is a plan view of a display panel. Figure 2 for Figure 1 The cross-sectional schematic diagram along the AA' direction in FIG. 1 shows a display panel including a substrate 1 having a first surface 101 and a second surface 102 arranged opposite to each other; the display panel also includes: a plurality of light-emitting units 2 arranged on the first surface 101 of the substrate 1, and a plurality of sound-emitting units 3 arranged on the first surface 101 of the substrate 1 and between adjacent light-emitting units 2; wherein,

[0052] The sound generating unit 3 comprises:

[0053] The piezoelectric device 31 is arranged on the first surface 101 of the substrate 1;

[0054] The sound focusing structure 32 is disposed on the first surface 101 of the substrate 1 and surrounds the piezoelectric device 31;

[0055] The back cavity 33 is disposed on the second surface 102 of the base substrate 1 and is recessed toward the first surface 101 , and the back cavity 33 is disposed corresponding to the piezoelectric device 31 .

[0056] The above-mentioned display panel provided by the embodiment of the present disclosure arranges multiple sound-emitting units between adjacent light-emitting units, so that the integration process of the display panel integrating the screen sound function is relatively simple; and, the inverse piezoelectric effect of the piezoelectric device is used to generate 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.

[0057] 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.

[0058] Specifically, the base substrate may be a glass substrate, but is not limited thereto. Optionally, the glass substrate uses high-temperature glass, and the thickness of the glass substrate may be 500 μm to 1000 μm.

[0059] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, 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, and the first support portion 11 is formed after the back cavity 33 is made on the original substrate 1, that is, the thickness of the first support portion 11 is less than 20% of the thickness of the substrate 1, so that 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 thicker, resulting in a poor vibration effect, which is not conducive to the sound of the screen.

[0060] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Figure 1 and Figure 2 As shown, the size of the back cavity 33 corresponding to each sound unit 3 can be the same, so that the manufacturing process of the back cavity 33 can be unified and the process complexity can be reduced. Figure 1The sizes of the back cavities 33 corresponding to the different sound generating units 3 shown in FIG. 3 may not be completely the same. For example, the sizes of the back cavities 33 corresponding to some sound generating units 3 are relatively large, such as Figure 3A As shown, 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 generating units 3 is centered, such as Figure 3B As shown, for example, the size of the back cavity 33 is approximately equal to the size of the piezoelectric device 31; the size of the back cavity 33 corresponding to some sound generating units 3 is smaller, such as Figure 3C As shown, 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 position, and can be prepared by glass through-hole technology or laser-induced etching. Increasing the volume of the back cavity 33 can enhance the low-frequency effect, and reducing the volume of the back cavity 33 can enhance the high-frequency effect, making the timbre richer. Therefore, those skilled in the art can design the size of the back cavity 33 according to actual needs, and the present disclosure does not limit this.

[0061] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Figure 2 and Figure 4 As shown, Figure 4 for Figure 2 The schematic diagram of the partial planar structure of the substrate 1 in the figure shows that the 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 connection portions 13 arranged at intervals. There is a through hole V penetrating the substrate 1 between two adjacent connection portions 13. The first support portion 11, the second support portion 12 and the connection portion 13 are an integrated structure. Specifically, the first support portion 11 mainly supports the piezoelectric device 31, and the connection between the first support portion 11 and the surrounding second support portion 12 is partially connected by the connection portion 13, which is conducive to increasing the amplitude of the piezoelectric device 31 when it vibrates, thereby improving the sound pressure level and sensitivity of the speaker.

[0062] Optionally, in the above display panel provided in the embodiment of the present disclosure, if Figure 2 and Figure 4 As shown, 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 2 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 2 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 2 is also polygonal; and so on.

[0063] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, the piezoelectric device 31 includes a first electrode 311, a piezoelectric layer 312, and a second electrode 313 which are sequentially stacked on the side of the first support portion 11 away from the back cavity 33. The different thickness ratios of the first support portion 11 and the piezoelectric layer 312 will affect the sound pressure level (SPL) and sensitivity (Sensitivity) of the speaker. Figure 5A and Figure 5B As shown, Figure 5A is a schematic diagram showing the relationship between the thickness ratio D of the first support portion 11 and the piezoelectric layer 312 and the sound pressure level (SPL), Figure 5B It is a schematic diagram of the relationship between the ratio of the thickness D of the first support part 11 and the piezoelectric layer 312 and the 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 32 is between 1 and 10, the sound effect of the sound unit 3 is better. Therefore, the embodiment of the present disclosure sets the ratio of the thickness of the first support part 11 to the thickness of the piezoelectric layer 32 to 1 to 10.

[0064] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, 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.

[0065] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, 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.

[0066] 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 making the piezoelectric layer can be selected according to the actual use needs of those skilled in the art, and is not limited here. Among them, when PZT is used to make the piezoelectric layer, since PZT has a high piezoelectric coefficient, the piezoelectric characteristics of the corresponding piezoelectric sensor are guaranteed, and the corresponding piezoelectric sensor can be applied to the tactile feedback device, and PZT has a high light transmittance, and when it is integrated into a display device, it does not affect the display quality of the display device.

[0067] Optionally, the piezoelectric layer may be prepared by sputtering or a sol-gel method, but is not limited thereto.

[0068] In the specific implementation process, the first electrode and the second electrode can be made of indium tin oxide (ITO), or indium zinc oxide (IZO), and of course 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, it 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.

[0069] Optionally, the first electrode and the second electrode may be prepared by sputtering or electron evaporation, but is not limited thereto.

[0070] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 6A-6C As shown, Fig. 6A For Figure 3A Schematic diagram of the deformation process. Figure 6B For Figure 3B Schematic diagram of the deformation process. Figure 6C For Figure 3C Schematic diagram of the deformation, the sound unit 3 is provided with a pore H penetrating the piezoelectric device 31 and the first support portion 11, the size of the pore H can be 0-9 μm, and the setting of the pore H can enhance the low-frequency response. Optionally, the orthographic projection shape of the pore H on the substrate 1 can be a circle, and the diameter of the circle is 0-9 μm.

[0071] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 7 As shown, the angle θ between the tangent line 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 .

[0072] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 7 As shown, the cross-sectional shape of the inner wall of the sound focusing structure 32 along the thickness direction of the base substrate 1 is a straight line, but it is certainly not limited to this; for example, Fig. 8A As shown, the cross-sectional shape of the inner wall of the sound focusing structure 32 along the thickness direction of the base substrate 1 can be a parabola; Figure 8B As shown, the cross-sectional shape of the inner wall of the sound focusing structure 32 along the thickness direction of the base substrate 1 can be a broken line; Figure 8C As shown, the cross-sectional shape of the inner wall of the sound focusing structure 32 along the thickness direction of the base substrate 1 can be sawtooth-shaped; of course, it is not limited to this.

[0073] In a 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 Figure 2 and Figure 7 As shown, the thickness d of the sound focusing structure 32 may be 10 μm to 100 μm, and the width w1 of the sound focusing structure 32 may be 30 μm to 100 μm.

[0074] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Figure 2 and Figure 7 As shown, there is a gap between the sound focusing structure 32 and the light emitting device 31 , and a width w2 of the gap is greater than or equal to 0 and less than or equal to half of a width w3 of the light emitting device 31 .

[0075] 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.

[0076] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Fig. 9A and Fig. 9B As shown, a plurality of light emitting units 2 are arranged in an array on one side of the substrate 1, and a row of sound emitting units 3 is arranged between at least two adjacent rows of light emitting units 2. Specifically, as Fig. 9A As shown, in two adjacent columns of light-emitting units 2, only one side of one column of light-emitting units 2 is provided with a column of sound-emitting units 3. Fig. 9A The structure shown is a single column display and a single column display sound at the same time; Figure 1 and Fig. 9B As shown, a row of sound-emitting units 3 is correspondingly arranged between each two adjacent rows of light-emitting units 2. Figure 1 and Fig. 9B Sound integration for all displays.

[0077] In a specific implementation, in the above display panel provided in the embodiment of the present disclosure, if Fig. 10A and Fig. 10BAs shown, the plurality of light-emitting units 2 include a plurality of rows and columns of light-emitting units 2 (the disclosure only shows some rows and some columns), 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 arranged at intervals at even-numbered rows of one column of light-emitting units 2, and / or the sound-emitting units 3 are arranged at intervals at odd-numbered rows of the other column of light-emitting units 2. Fig. 10A and Fig. 10B The arrangement of the middle sound generating units 3 is similar to a chessboard arrangement.

[0078] In specific implementation, when driving the above-mentioned sound unit 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, Fig. 9A , Fig. 9B and Fig. 10A As shown, the first electrodes 311 of the piezoelectric devices 31 in the same row of sound units 3 are electrically connected to the first driving voltage terminal (ground terminal GND) through the first lead, and the second electrodes 313 of the piezoelectric devices 31 in the same row of sound units 3 are electrically connected to the second driving voltage terminal (AC voltage terminal V AC ) electrical connection. Fig. 9A , Fig. 9B and Fig. 10A Column driving (regional driving) can be adopted, that is, driving the sound unit 3 in different regions, so as to realize the pronunciation of different regions on the screen.

[0079] like Fig. 10B As shown, the first electrode 311 of each piezoelectric device 31 in all sound-generating 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 sound-generating units 3 is electrically connected to the second driving voltage terminal (AC voltage terminal V AC ) electrical connection. Fig. 10B All drivers are used to achieve overall screen pronunciation.

[0080] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, the calculation principle of the neutral axis of the piezoelectric layer 312 (diaphragm) of the sound unit 3 (speaker) is as follows Fig.11 As shown, the natural frequency resonance characteristics of the loudspeaker diaphragm are as follows (1):

[0081]

[0082] Among them, 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.

[0083]

[0084]

[0085] Wherein, 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 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 as follows Figures 12A-12D Diaphragm units of different sizes are integrated to achieve multi-frequency driving. Figures 12A-12D Where r1, r2, and r3 represent diaphragms of different radii. r1<r2<r3 can all be substituted into the above formula to achieve different frequency response characteristics, such as Fig.13A and Fig. 13B As shown, Fig.13A is the time domain signal, Fig. 13B It is the 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, if Figure 1 , Fig. 9A , Fig. 9B and Fig. 10A As shown, the size (eg, radius 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 units in the array-distributed light-emitting units and the driving method of the sound units can achieve better quality and more diverse sound effects, thereby well 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, Figures 12A-12D As shown, the sizes of the piezoelectric layers 312 (diaphragms) in the piezoelectric devices 31 are not completely the same. Fig. 12A As shown, in two adjacent columns of light-emitting units 2, the radius 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 the same, for example, both are r1; the radius 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. Fig. 12B As shown, 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 sequence as r1, r2, and r3 as repeating units; 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 Fig. 12CAs shown, 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 sequence as r1, r2, and r3 as repeating units; 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 Fig.12D As shown, the radius of the piezoelectric layer 312 (diaphragm) in a row of sound-emitting units 3 on one side of each row of light-emitting units 2 is arranged in sequence as r1, r2, and r3 as a repeating unit. Of course, the arrangement of the piezoelectric devices 31 with piezoelectric layers 312 (diaphragms) of different sizes is not limited to the above-mentioned methods listed in the present disclosure, and can be designed according to needs.

[0088] In a specific implementation, in the above-mentioned display panel provided in the embodiment of the present disclosure, if Figure 2 As shown, it also 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 the display and the sound at the same time. Specifically, the driving circuit 4 thereon is a TFT array layer, and the TFT can be a LTPS process. Before the light-emitting unit 2 and the sound-emitting unit 3 are made on the base substrate 1, the driving circuit 4 is made on the base substrate 1. The driving circuit 4 is used to drive the corresponding light-emitting unit 2 to emit light and drive the corresponding sound-emitting unit 3 to make a sound.

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

[0090] Specifically, Figure 2 As shown, after the driving circuit 4 is manufactured, a bump pad can be used to electrically connect with the LED chip, and the bump pad is formed by Au-Sn or Au-In bonding. The LED can be a conventional micro-LED chip (micro-LED) flip chip structure, and materials 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 directly manufactured on the driving circuit 4. After the driving circuit 4 is manufactured, a plurality of light emitting elements (21, 22 and 23) are formed in an array on the driving circuit 4. There is a gap of a certain width between adjacent light emitting elements (21, 22 and 23), and the sound 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, the embodiment of the present disclosure further provides a display device, including the above-mentioned display panel provided in the embodiment of the present disclosure. Since the principle of solving the problem of the display device is similar to that of the above-mentioned display panel, the implementation of the display device can refer to the implementation of the above-mentioned display panel, and the repeated parts will not be repeated. The display device can be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display or touch function.

[0094] In specific implementation, the above-mentioned display device provided by the embodiment of the present disclosure may also 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 arranges a plurality of sound-emitting units between adjacent light-emitting units, so that the integration process of the display panel into the screen sound-emitting function is relatively simple; and the inverse piezoelectric effect of the piezoelectric device is used to generate deformation vibration to drive the air in the back cavity to vibrate and emit sound waves, thereby realizing screen sound. The sound-emitting sound can be focused by the sound-focusing structure, thereby improving the problems of poor timbre and insufficient sound directivity 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 concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.

[0097] Obviously, those skilled in the art can 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 these modifications and variations 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 also intended to include these modifications and variations.

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 light emitting 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 light emitting 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.

Images